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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07002 * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
3 * Horst Hummel <Horst.Hummel@de.ibm.com>
4 * Carsten Otte <Cotte@de.ibm.com>
5 * Martin Schwidefsky <schwidefsky@de.ibm.com>
6 * Bugreports.to..: <Linux390@de.ibm.com>
Stefan Haberlandd41dd122009-06-16 10:30:25 +02007 * Copyright IBM Corp. 1999, 2009
Linus Torvalds1da177e2005-04-16 15:20:36 -07008 */
9
Stefan Haberlandfc19f382009-03-26 15:23:49 +010010#define KMSG_COMPONENT "dasd"
11#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
12
Linus Torvalds1da177e2005-04-16 15:20:36 -070013#include <linux/kmod.h>
14#include <linux/init.h>
15#include <linux/interrupt.h>
16#include <linux/ctype.h>
17#include <linux/major.h>
18#include <linux/slab.h>
Christoph Hellwiga885c8c2006-01-08 01:02:50 -080019#include <linux/hdreg.h>
Cornelia Huckf3445a12009-04-14 15:36:23 +020020#include <linux/async.h>
Stefan Haberland9eb25122010-02-26 22:37:46 +010021#include <linux/mutex.h>
Stefan Weinhuber4fa52aa2011-07-24 10:48:32 +020022#include <linux/debugfs.h>
23#include <linux/seq_file.h>
Stefan Weinhubere4258d52011-08-03 16:44:20 +020024#include <linux/vmalloc.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070025
26#include <asm/ccwdev.h>
27#include <asm/ebcdic.h>
28#include <asm/idals.h>
Stefan Weinhuberf3eb5382009-03-26 15:23:48 +010029#include <asm/itcw.h>
Stefan Weinhuber33b62a32010-03-08 12:26:24 +010030#include <asm/diag.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070031
32/* This is ugly... */
33#define PRINTK_HEADER "dasd:"
34
35#include "dasd_int.h"
36/*
37 * SECTION: Constant definitions to be used within this file
38 */
39#define DASD_CHANQ_MAX_SIZE 4
40
Stefan Weinhuber1c1e0932010-05-12 09:32:11 +020041#define DASD_SLEEPON_START_TAG (void *) 1
42#define DASD_SLEEPON_END_TAG (void *) 2
43
Linus Torvalds1da177e2005-04-16 15:20:36 -070044/*
45 * SECTION: exported variables of dasd.c
46 */
47debug_info_t *dasd_debug_area;
Stefan Weinhuber4fa52aa2011-07-24 10:48:32 +020048static struct dentry *dasd_debugfs_root_entry;
Linus Torvalds1da177e2005-04-16 15:20:36 -070049struct dasd_discipline *dasd_diag_discipline_pointer;
Heiko Carstens2b67fc42007-02-05 21:16:47 +010050void dasd_int_handler(struct ccw_device *, unsigned long, struct irb *);
Linus Torvalds1da177e2005-04-16 15:20:36 -070051
52MODULE_AUTHOR("Holger Smolinski <Holger.Smolinski@de.ibm.com>");
53MODULE_DESCRIPTION("Linux on S/390 DASD device driver,"
Heiko Carstensa53c8fa2012-07-20 11:15:04 +020054 " Copyright IBM Corp. 2000");
Linus Torvalds1da177e2005-04-16 15:20:36 -070055MODULE_SUPPORTED_DEVICE("dasd");
Linus Torvalds1da177e2005-04-16 15:20:36 -070056MODULE_LICENSE("GPL");
57
58/*
59 * SECTION: prototypes for static functions of dasd.c
60 */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +010061static int dasd_alloc_queue(struct dasd_block *);
62static void dasd_setup_queue(struct dasd_block *);
63static void dasd_free_queue(struct dasd_block *);
64static void dasd_flush_request_queue(struct dasd_block *);
65static int dasd_flush_block_queue(struct dasd_block *);
66static void dasd_device_tasklet(struct dasd_device *);
67static void dasd_block_tasklet(struct dasd_block *);
Al Viro4927b3f2006-12-06 19:18:20 +000068static void do_kick_device(struct work_struct *);
Stefan Haberlandd41dd122009-06-16 10:30:25 +020069static void do_restore_device(struct work_struct *);
Stefan Haberland501183f2010-05-17 10:00:10 +020070static void do_reload_device(struct work_struct *);
Stefan Weinhuber8e09f212008-01-26 14:11:23 +010071static void dasd_return_cqr_cb(struct dasd_ccw_req *, void *);
Stefan Weinhuber48cae882009-02-11 10:37:31 +010072static void dasd_device_timeout(unsigned long);
73static void dasd_block_timeout(unsigned long);
Stefan Weinhubereb6e1992009-12-07 12:51:51 +010074static void __dasd_process_erp(struct dasd_device *, struct dasd_ccw_req *);
Stefan Weinhuber4fa52aa2011-07-24 10:48:32 +020075static void dasd_profile_init(struct dasd_profile *, struct dentry *);
76static void dasd_profile_exit(struct dasd_profile *);
Linus Torvalds1da177e2005-04-16 15:20:36 -070077
78/*
79 * SECTION: Operations on the device structure.
80 */
81static wait_queue_head_t dasd_init_waitq;
Horst Hummel8f617012006-08-30 14:33:33 +020082static wait_queue_head_t dasd_flush_wq;
Stefan Haberlandc80ee722008-05-30 10:03:31 +020083static wait_queue_head_t generic_waitq;
Stefan Haberland4679e892012-06-19 17:30:12 +020084static wait_queue_head_t shutdown_waitq;
Linus Torvalds1da177e2005-04-16 15:20:36 -070085
86/*
87 * Allocate memory for a new device structure.
88 */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +010089struct dasd_device *dasd_alloc_device(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -070090{
91 struct dasd_device *device;
92
Stefan Weinhuber8e09f212008-01-26 14:11:23 +010093 device = kzalloc(sizeof(struct dasd_device), GFP_ATOMIC);
94 if (!device)
Linus Torvalds1da177e2005-04-16 15:20:36 -070095 return ERR_PTR(-ENOMEM);
Linus Torvalds1da177e2005-04-16 15:20:36 -070096
97 /* Get two pages for normal block device operations. */
98 device->ccw_mem = (void *) __get_free_pages(GFP_ATOMIC | GFP_DMA, 1);
Stefan Weinhuber8e09f212008-01-26 14:11:23 +010099 if (!device->ccw_mem) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100 kfree(device);
101 return ERR_PTR(-ENOMEM);
102 }
103 /* Get one page for error recovery. */
104 device->erp_mem = (void *) get_zeroed_page(GFP_ATOMIC | GFP_DMA);
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100105 if (!device->erp_mem) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106 free_pages((unsigned long) device->ccw_mem, 1);
107 kfree(device);
108 return ERR_PTR(-ENOMEM);
109 }
110
111 dasd_init_chunklist(&device->ccw_chunks, device->ccw_mem, PAGE_SIZE*2);
112 dasd_init_chunklist(&device->erp_chunks, device->erp_mem, PAGE_SIZE);
113 spin_lock_init(&device->mem_lock);
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100114 atomic_set(&device->tasklet_scheduled, 0);
Horst Hummel138c0142006-06-29 14:58:12 +0200115 tasklet_init(&device->tasklet,
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100116 (void (*)(unsigned long)) dasd_device_tasklet,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700117 (unsigned long) device);
118 INIT_LIST_HEAD(&device->ccw_queue);
119 init_timer(&device->timer);
Stefan Weinhuber48cae882009-02-11 10:37:31 +0100120 device->timer.function = dasd_device_timeout;
121 device->timer.data = (unsigned long) device;
Al Viro4927b3f2006-12-06 19:18:20 +0000122 INIT_WORK(&device->kick_work, do_kick_device);
Stefan Haberlandd41dd122009-06-16 10:30:25 +0200123 INIT_WORK(&device->restore_device, do_restore_device);
Stefan Haberland501183f2010-05-17 10:00:10 +0200124 INIT_WORK(&device->reload_device, do_reload_device);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125 device->state = DASD_STATE_NEW;
126 device->target = DASD_STATE_NEW;
Stefan Haberland9eb25122010-02-26 22:37:46 +0100127 mutex_init(&device->state_mutex);
Stefan Weinhuber4fa52aa2011-07-24 10:48:32 +0200128 spin_lock_init(&device->profile.lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129 return device;
130}
131
132/*
133 * Free memory of a device structure.
134 */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100135void dasd_free_device(struct dasd_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136{
Jesper Juhl17fd6822005-11-07 01:01:30 -0800137 kfree(device->private);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138 free_page((unsigned long) device->erp_mem);
139 free_pages((unsigned long) device->ccw_mem, 1);
140 kfree(device);
141}
142
143/*
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100144 * Allocate memory for a new device structure.
145 */
146struct dasd_block *dasd_alloc_block(void)
147{
148 struct dasd_block *block;
149
150 block = kzalloc(sizeof(*block), GFP_ATOMIC);
151 if (!block)
152 return ERR_PTR(-ENOMEM);
153 /* open_count = 0 means device online but not in use */
154 atomic_set(&block->open_count, -1);
155
156 spin_lock_init(&block->request_queue_lock);
157 atomic_set(&block->tasklet_scheduled, 0);
158 tasklet_init(&block->tasklet,
159 (void (*)(unsigned long)) dasd_block_tasklet,
160 (unsigned long) block);
161 INIT_LIST_HEAD(&block->ccw_queue);
162 spin_lock_init(&block->queue_lock);
163 init_timer(&block->timer);
Stefan Weinhuber48cae882009-02-11 10:37:31 +0100164 block->timer.function = dasd_block_timeout;
165 block->timer.data = (unsigned long) block;
Stefan Weinhuber4fa52aa2011-07-24 10:48:32 +0200166 spin_lock_init(&block->profile.lock);
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100167
168 return block;
169}
170
171/*
172 * Free memory of a device structure.
173 */
174void dasd_free_block(struct dasd_block *block)
175{
176 kfree(block);
177}
178
179/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180 * Make a new device known to the system.
181 */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100182static int dasd_state_new_to_known(struct dasd_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183{
184 int rc;
185
186 /*
Horst Hummel138c0142006-06-29 14:58:12 +0200187 * As long as the device is not in state DASD_STATE_NEW we want to
Linus Torvalds1da177e2005-04-16 15:20:36 -0700188 * keep the reference count > 0.
189 */
190 dasd_get_device(device);
191
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100192 if (device->block) {
193 rc = dasd_alloc_queue(device->block);
194 if (rc) {
195 dasd_put_device(device);
196 return rc;
197 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199 device->state = DASD_STATE_KNOWN;
200 return 0;
201}
202
203/*
204 * Let the system forget about a device.
205 */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100206static int dasd_state_known_to_new(struct dasd_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207{
Stefan Weinhuber20c64462006-03-24 03:15:25 -0800208 /* Disable extended error reporting for this device. */
209 dasd_eer_disable(device);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210 /* Forget the discipline information. */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100211 if (device->discipline) {
212 if (device->discipline->uncheck_device)
213 device->discipline->uncheck_device(device);
Peter Oberparleiteraa888612006-02-20 18:28:13 -0800214 module_put(device->discipline->owner);
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100215 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700216 device->discipline = NULL;
Peter Oberparleiteraa888612006-02-20 18:28:13 -0800217 if (device->base_discipline)
218 module_put(device->base_discipline->owner);
219 device->base_discipline = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700220 device->state = DASD_STATE_NEW;
221
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100222 if (device->block)
223 dasd_free_queue(device->block);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224
225 /* Give up reference we took in dasd_state_new_to_known. */
226 dasd_put_device(device);
Horst Hummel8f617012006-08-30 14:33:33 +0200227 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228}
229
Stefan Weinhuber4fa52aa2011-07-24 10:48:32 +0200230static struct dentry *dasd_debugfs_setup(const char *name,
231 struct dentry *base_dentry)
232{
233 struct dentry *pde;
234
235 if (!base_dentry)
236 return NULL;
237 pde = debugfs_create_dir(name, base_dentry);
238 if (!pde || IS_ERR(pde))
239 return NULL;
240 return pde;
241}
242
Linus Torvalds1da177e2005-04-16 15:20:36 -0700243/*
244 * Request the irq line for the device.
245 */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100246static int dasd_state_known_to_basic(struct dasd_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700247{
Stefan Weinhuber4fa52aa2011-07-24 10:48:32 +0200248 struct dasd_block *block = device->block;
Stefan Haberlandd42e1712013-04-15 16:22:23 +0200249 int rc = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250
251 /* Allocate and register gendisk structure. */
Stefan Weinhuber4fa52aa2011-07-24 10:48:32 +0200252 if (block) {
253 rc = dasd_gendisk_alloc(block);
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100254 if (rc)
255 return rc;
Stefan Weinhuber4fa52aa2011-07-24 10:48:32 +0200256 block->debugfs_dentry =
257 dasd_debugfs_setup(block->gdp->disk_name,
258 dasd_debugfs_root_entry);
259 dasd_profile_init(&block->profile, block->debugfs_dentry);
260 if (dasd_global_profile_level == DASD_PROFILE_ON)
261 dasd_profile_on(&device->block->profile);
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100262 }
Stefan Weinhuber4fa52aa2011-07-24 10:48:32 +0200263 device->debugfs_dentry =
264 dasd_debugfs_setup(dev_name(&device->cdev->dev),
265 dasd_debugfs_root_entry);
266 dasd_profile_init(&device->profile, device->debugfs_dentry);
267
Linus Torvalds1da177e2005-04-16 15:20:36 -0700268 /* register 'device' debug area, used for all DBF_DEV_XXX calls */
Stefan Haberlandfc19f382009-03-26 15:23:49 +0100269 device->debug_area = debug_register(dev_name(&device->cdev->dev), 4, 1,
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100270 8 * sizeof(long));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271 debug_register_view(device->debug_area, &debug_sprintf_view);
Horst Hummelb0035f12006-09-20 15:59:07 +0200272 debug_set_level(device->debug_area, DBF_WARNING);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700273 DBF_DEV_EVENT(DBF_EMERG, device, "%s", "debug area created");
274
275 device->state = DASD_STATE_BASIC;
Stefan Haberlandd42e1712013-04-15 16:22:23 +0200276
277 return rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700278}
279
280/*
281 * Release the irq line for the device. Terminate any running i/o.
282 */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100283static int dasd_state_basic_to_known(struct dasd_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700284{
Horst Hummel8f617012006-08-30 14:33:33 +0200285 int rc;
Stefan Haberlandd42e1712013-04-15 16:22:23 +0200286
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100287 if (device->block) {
Stefan Weinhuber4fa52aa2011-07-24 10:48:32 +0200288 dasd_profile_exit(&device->block->profile);
289 if (device->block->debugfs_dentry)
290 debugfs_remove(device->block->debugfs_dentry);
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100291 dasd_gendisk_free(device->block);
292 dasd_block_clear_timer(device->block);
293 }
294 rc = dasd_flush_device_queue(device);
Horst Hummel8f617012006-08-30 14:33:33 +0200295 if (rc)
296 return rc;
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100297 dasd_device_clear_timer(device);
Stefan Weinhuber4fa52aa2011-07-24 10:48:32 +0200298 dasd_profile_exit(&device->profile);
299 if (device->debugfs_dentry)
300 debugfs_remove(device->debugfs_dentry);
Horst Hummel8f617012006-08-30 14:33:33 +0200301
Linus Torvalds1da177e2005-04-16 15:20:36 -0700302 DBF_DEV_EVENT(DBF_EMERG, device, "%p debug area deleted", device);
303 if (device->debug_area != NULL) {
304 debug_unregister(device->debug_area);
305 device->debug_area = NULL;
306 }
307 device->state = DASD_STATE_KNOWN;
Horst Hummel8f617012006-08-30 14:33:33 +0200308 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700309}
310
311/*
312 * Do the initial analysis. The do_analysis function may return
313 * -EAGAIN in which case the device keeps the state DASD_STATE_BASIC
314 * until the discipline decides to continue the startup sequence
315 * by calling the function dasd_change_state. The eckd disciplines
316 * uses this to start a ccw that detects the format. The completion
317 * interrupt for this detection ccw uses the kernel event daemon to
318 * trigger the call to dasd_change_state. All this is done in the
319 * discipline code, see dasd_eckd.c.
Horst Hummel90f00942006-03-07 21:55:39 -0800320 * After the analysis ccw is done (do_analysis returned 0) the block
321 * device is setup.
322 * In case the analysis returns an error, the device setup is stopped
323 * (a fake disk was already added to allow formatting).
Linus Torvalds1da177e2005-04-16 15:20:36 -0700324 */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100325static int dasd_state_basic_to_ready(struct dasd_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326{
327 int rc;
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100328 struct dasd_block *block;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700329
330 rc = 0;
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100331 block = device->block;
Horst Hummel90f00942006-03-07 21:55:39 -0800332 /* make disk known with correct capacity */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100333 if (block) {
334 if (block->base->discipline->do_analysis != NULL)
335 rc = block->base->discipline->do_analysis(block);
336 if (rc) {
Stefan Haberlandd42e1712013-04-15 16:22:23 +0200337 if (rc != -EAGAIN) {
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100338 device->state = DASD_STATE_UNFMT;
Stefan Haberlandd42e1712013-04-15 16:22:23 +0200339 goto out;
340 }
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100341 return rc;
342 }
343 dasd_setup_queue(block);
344 set_capacity(block->gdp,
345 block->blocks << block->s2b_shift);
346 device->state = DASD_STATE_READY;
347 rc = dasd_scan_partitions(block);
Stefan Haberlandd42e1712013-04-15 16:22:23 +0200348 if (rc) {
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100349 device->state = DASD_STATE_BASIC;
Stefan Haberlandd42e1712013-04-15 16:22:23 +0200350 return rc;
351 }
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100352 } else {
353 device->state = DASD_STATE_READY;
354 }
Stefan Haberlandd42e1712013-04-15 16:22:23 +0200355out:
356 if (device->discipline->basic_to_ready)
357 rc = device->discipline->basic_to_ready(device);
Horst Hummel90f00942006-03-07 21:55:39 -0800358 return rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700359}
360
Stefan Haberlandd07dc5d2012-11-28 13:43:38 +0100361static inline
362int _wait_for_empty_queues(struct dasd_device *device)
363{
364 if (device->block)
365 return list_empty(&device->ccw_queue) &&
366 list_empty(&device->block->ccw_queue);
367 else
368 return list_empty(&device->ccw_queue);
369}
370
Linus Torvalds1da177e2005-04-16 15:20:36 -0700371/*
372 * Remove device from block device layer. Destroy dirty buffers.
373 * Forget format information. Check if the target level is basic
374 * and if it is create fake disk for formatting.
375 */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100376static int dasd_state_ready_to_basic(struct dasd_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700377{
Horst Hummel8f617012006-08-30 14:33:33 +0200378 int rc;
379
Stefan Haberlandd42e1712013-04-15 16:22:23 +0200380 if (device->discipline->ready_to_basic) {
381 rc = device->discipline->ready_to_basic(device);
382 if (rc)
383 return rc;
384 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700385 device->state = DASD_STATE_BASIC;
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100386 if (device->block) {
387 struct dasd_block *block = device->block;
388 rc = dasd_flush_block_queue(block);
389 if (rc) {
390 device->state = DASD_STATE_READY;
391 return rc;
392 }
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100393 dasd_flush_request_queue(block);
Stefan Haberlandb695adf2010-02-26 22:37:48 +0100394 dasd_destroy_partitions(block);
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100395 block->blocks = 0;
396 block->bp_block = 0;
397 block->s2b_shift = 0;
398 }
Horst Hummel8f617012006-08-30 14:33:33 +0200399 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700400}
401
402/*
Horst Hummel90f00942006-03-07 21:55:39 -0800403 * Back to basic.
404 */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100405static int dasd_state_unfmt_to_basic(struct dasd_device *device)
Horst Hummel90f00942006-03-07 21:55:39 -0800406{
407 device->state = DASD_STATE_BASIC;
Horst Hummel8f617012006-08-30 14:33:33 +0200408 return 0;
Horst Hummel90f00942006-03-07 21:55:39 -0800409}
410
411/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700412 * Make the device online and schedule the bottom half to start
413 * the requeueing of requests from the linux request queue to the
414 * ccw queue.
415 */
Horst Hummel8f617012006-08-30 14:33:33 +0200416static int
Linus Torvalds1da177e2005-04-16 15:20:36 -0700417dasd_state_ready_to_online(struct dasd_device * device)
418{
Stefan Weinhuber13018092009-01-09 12:14:50 +0100419 struct gendisk *disk;
420 struct disk_part_iter piter;
421 struct hd_struct *part;
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100422
Linus Torvalds1da177e2005-04-16 15:20:36 -0700423 device->state = DASD_STATE_ONLINE;
Stefan Weinhuber13018092009-01-09 12:14:50 +0100424 if (device->block) {
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100425 dasd_schedule_block_bh(device->block);
Stefan Haberlande4dbb0f2011-01-05 12:48:06 +0100426 if ((device->features & DASD_FEATURE_USERAW)) {
427 disk = device->block->gdp;
428 kobject_uevent(&disk_to_dev(disk)->kobj, KOBJ_CHANGE);
429 return 0;
430 }
Stefan Weinhuber13018092009-01-09 12:14:50 +0100431 disk = device->block->bdev->bd_disk;
432 disk_part_iter_init(&piter, disk, DISK_PITER_INCL_PART0);
433 while ((part = disk_part_iter_next(&piter)))
434 kobject_uevent(&part_to_dev(part)->kobj, KOBJ_CHANGE);
435 disk_part_iter_exit(&piter);
436 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700437 return 0;
438}
439
440/*
441 * Stop the requeueing of requests again.
442 */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100443static int dasd_state_online_to_ready(struct dasd_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700444{
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100445 int rc;
Stefan Weinhuber13018092009-01-09 12:14:50 +0100446 struct gendisk *disk;
447 struct disk_part_iter piter;
448 struct hd_struct *part;
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100449
450 if (device->discipline->online_to_ready) {
451 rc = device->discipline->online_to_ready(device);
452 if (rc)
453 return rc;
454 }
Stefan Haberlandd42e1712013-04-15 16:22:23 +0200455
Linus Torvalds1da177e2005-04-16 15:20:36 -0700456 device->state = DASD_STATE_READY;
Stefan Haberlande4dbb0f2011-01-05 12:48:06 +0100457 if (device->block && !(device->features & DASD_FEATURE_USERAW)) {
Stefan Weinhuber13018092009-01-09 12:14:50 +0100458 disk = device->block->bdev->bd_disk;
459 disk_part_iter_init(&piter, disk, DISK_PITER_INCL_PART0);
460 while ((part = disk_part_iter_next(&piter)))
461 kobject_uevent(&part_to_dev(part)->kobj, KOBJ_CHANGE);
462 disk_part_iter_exit(&piter);
463 }
Horst Hummel8f617012006-08-30 14:33:33 +0200464 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700465}
466
467/*
468 * Device startup state changes.
469 */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100470static int dasd_increase_state(struct dasd_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700471{
472 int rc;
473
474 rc = 0;
475 if (device->state == DASD_STATE_NEW &&
476 device->target >= DASD_STATE_KNOWN)
477 rc = dasd_state_new_to_known(device);
478
479 if (!rc &&
480 device->state == DASD_STATE_KNOWN &&
481 device->target >= DASD_STATE_BASIC)
482 rc = dasd_state_known_to_basic(device);
483
484 if (!rc &&
485 device->state == DASD_STATE_BASIC &&
486 device->target >= DASD_STATE_READY)
487 rc = dasd_state_basic_to_ready(device);
488
489 if (!rc &&
Horst Hummel39ccf952006-04-27 18:40:10 -0700490 device->state == DASD_STATE_UNFMT &&
491 device->target > DASD_STATE_UNFMT)
492 rc = -EPERM;
493
494 if (!rc &&
Linus Torvalds1da177e2005-04-16 15:20:36 -0700495 device->state == DASD_STATE_READY &&
496 device->target >= DASD_STATE_ONLINE)
497 rc = dasd_state_ready_to_online(device);
498
499 return rc;
500}
501
502/*
503 * Device shutdown state changes.
504 */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100505static int dasd_decrease_state(struct dasd_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700506{
Horst Hummel8f617012006-08-30 14:33:33 +0200507 int rc;
508
509 rc = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700510 if (device->state == DASD_STATE_ONLINE &&
511 device->target <= DASD_STATE_READY)
Horst Hummel8f617012006-08-30 14:33:33 +0200512 rc = dasd_state_online_to_ready(device);
Horst Hummel138c0142006-06-29 14:58:12 +0200513
Horst Hummel8f617012006-08-30 14:33:33 +0200514 if (!rc &&
515 device->state == DASD_STATE_READY &&
Linus Torvalds1da177e2005-04-16 15:20:36 -0700516 device->target <= DASD_STATE_BASIC)
Horst Hummel8f617012006-08-30 14:33:33 +0200517 rc = dasd_state_ready_to_basic(device);
Horst Hummel90f00942006-03-07 21:55:39 -0800518
Horst Hummel8f617012006-08-30 14:33:33 +0200519 if (!rc &&
520 device->state == DASD_STATE_UNFMT &&
Horst Hummel90f00942006-03-07 21:55:39 -0800521 device->target <= DASD_STATE_BASIC)
Horst Hummel8f617012006-08-30 14:33:33 +0200522 rc = dasd_state_unfmt_to_basic(device);
Horst Hummel90f00942006-03-07 21:55:39 -0800523
Horst Hummel8f617012006-08-30 14:33:33 +0200524 if (!rc &&
525 device->state == DASD_STATE_BASIC &&
Linus Torvalds1da177e2005-04-16 15:20:36 -0700526 device->target <= DASD_STATE_KNOWN)
Horst Hummel8f617012006-08-30 14:33:33 +0200527 rc = dasd_state_basic_to_known(device);
Horst Hummel138c0142006-06-29 14:58:12 +0200528
Horst Hummel8f617012006-08-30 14:33:33 +0200529 if (!rc &&
530 device->state == DASD_STATE_KNOWN &&
Linus Torvalds1da177e2005-04-16 15:20:36 -0700531 device->target <= DASD_STATE_NEW)
Horst Hummel8f617012006-08-30 14:33:33 +0200532 rc = dasd_state_known_to_new(device);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700533
Horst Hummel8f617012006-08-30 14:33:33 +0200534 return rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700535}
536
537/*
538 * This is the main startup/shutdown routine.
539 */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100540static void dasd_change_state(struct dasd_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700541{
Sebastian Ott181d9522009-06-22 12:08:21 +0200542 int rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700543
544 if (device->state == device->target)
545 /* Already where we want to go today... */
546 return;
547 if (device->state < device->target)
548 rc = dasd_increase_state(device);
549 else
550 rc = dasd_decrease_state(device);
Sebastian Ott181d9522009-06-22 12:08:21 +0200551 if (rc == -EAGAIN)
552 return;
553 if (rc)
554 device->target = device->state;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700555
Horst Hummel4dfd5c42007-04-27 16:01:47 +0200556 /* let user-space know that the device status changed */
557 kobject_uevent(&device->cdev->dev.kobj, KOBJ_CHANGE);
Sebastian Ott1f08be82012-09-05 14:18:22 +0200558
559 if (device->state == device->target)
560 wake_up(&dasd_init_waitq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700561}
562
563/*
564 * Kick starter for devices that did not complete the startup/shutdown
565 * procedure or were sleeping because of a pending state.
566 * dasd_kick_device will schedule a call do do_kick_device to the kernel
567 * event daemon.
568 */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100569static void do_kick_device(struct work_struct *work)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700570{
Al Viro4927b3f2006-12-06 19:18:20 +0000571 struct dasd_device *device = container_of(work, struct dasd_device, kick_work);
Stefan Haberland9eb25122010-02-26 22:37:46 +0100572 mutex_lock(&device->state_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700573 dasd_change_state(device);
Stefan Haberland9eb25122010-02-26 22:37:46 +0100574 mutex_unlock(&device->state_mutex);
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100575 dasd_schedule_device_bh(device);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700576 dasd_put_device(device);
577}
578
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100579void dasd_kick_device(struct dasd_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700580{
581 dasd_get_device(device);
582 /* queue call to dasd_kick_device to the kernel event daemon. */
583 schedule_work(&device->kick_work);
584}
585
586/*
Stefan Haberland501183f2010-05-17 10:00:10 +0200587 * dasd_reload_device will schedule a call do do_reload_device to the kernel
588 * event daemon.
589 */
590static void do_reload_device(struct work_struct *work)
591{
592 struct dasd_device *device = container_of(work, struct dasd_device,
593 reload_device);
594 device->discipline->reload(device);
595 dasd_put_device(device);
596}
597
598void dasd_reload_device(struct dasd_device *device)
599{
600 dasd_get_device(device);
601 /* queue call to dasd_reload_device to the kernel event daemon. */
602 schedule_work(&device->reload_device);
603}
604EXPORT_SYMBOL(dasd_reload_device);
605
606/*
Stefan Haberlandd41dd122009-06-16 10:30:25 +0200607 * dasd_restore_device will schedule a call do do_restore_device to the kernel
608 * event daemon.
609 */
610static void do_restore_device(struct work_struct *work)
611{
612 struct dasd_device *device = container_of(work, struct dasd_device,
613 restore_device);
614 device->cdev->drv->restore(device->cdev);
615 dasd_put_device(device);
616}
617
618void dasd_restore_device(struct dasd_device *device)
619{
620 dasd_get_device(device);
621 /* queue call to dasd_restore_device to the kernel event daemon. */
622 schedule_work(&device->restore_device);
623}
624
625/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700626 * Set the target state for a device and starts the state change.
627 */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100628void dasd_set_target_state(struct dasd_device *device, int target)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700629{
Cornelia Huckf3445a12009-04-14 15:36:23 +0200630 dasd_get_device(device);
Stefan Haberland9eb25122010-02-26 22:37:46 +0100631 mutex_lock(&device->state_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700632 /* If we are in probeonly mode stop at DASD_STATE_READY. */
633 if (dasd_probeonly && target > DASD_STATE_READY)
634 target = DASD_STATE_READY;
635 if (device->target != target) {
Stefan Haberland9eb25122010-02-26 22:37:46 +0100636 if (device->state == target)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700637 wake_up(&dasd_init_waitq);
638 device->target = target;
639 }
640 if (device->state != device->target)
641 dasd_change_state(device);
Stefan Haberland9eb25122010-02-26 22:37:46 +0100642 mutex_unlock(&device->state_mutex);
643 dasd_put_device(device);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700644}
645
646/*
647 * Enable devices with device numbers in [from..to].
648 */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100649static inline int _wait_for_device(struct dasd_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700650{
651 return (device->state == device->target);
652}
653
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100654void dasd_enable_device(struct dasd_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700655{
656 dasd_set_target_state(device, DASD_STATE_ONLINE);
657 if (device->state <= DASD_STATE_KNOWN)
658 /* No discipline for device found. */
659 dasd_set_target_state(device, DASD_STATE_NEW);
660 /* Now wait for the devices to come up. */
661 wait_event(dasd_init_waitq, _wait_for_device(device));
Stefan Haberland25e2cf12012-03-11 11:59:37 -0400662
663 dasd_reload_device(device);
664 if (device->discipline->kick_validate)
665 device->discipline->kick_validate(device);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700666}
667
668/*
669 * SECTION: device operation (interrupt handler, start i/o, term i/o ...)
670 */
Stefan Weinhuber4fa52aa2011-07-24 10:48:32 +0200671
672unsigned int dasd_global_profile_level = DASD_PROFILE_OFF;
673
Linus Torvalds1da177e2005-04-16 15:20:36 -0700674#ifdef CONFIG_DASD_PROFILE
Stefan Weinhuber4fa52aa2011-07-24 10:48:32 +0200675struct dasd_profile_info dasd_global_profile_data;
676static struct dentry *dasd_global_profile_dentry;
677static struct dentry *dasd_debugfs_global_entry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700678
679/*
680 * Add profiling information for cqr before execution.
681 */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100682static void dasd_profile_start(struct dasd_block *block,
683 struct dasd_ccw_req *cqr,
684 struct request *req)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700685{
686 struct list_head *l;
687 unsigned int counter;
Stefan Weinhuber4fa52aa2011-07-24 10:48:32 +0200688 struct dasd_device *device;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700689
690 /* count the length of the chanq for statistics */
691 counter = 0;
Stefan Weinhuber4fa52aa2011-07-24 10:48:32 +0200692 if (dasd_global_profile_level || block->profile.data)
693 list_for_each(l, &block->ccw_queue)
694 if (++counter >= 31)
695 break;
696
697 if (dasd_global_profile_level) {
698 dasd_global_profile_data.dasd_io_nr_req[counter]++;
699 if (rq_data_dir(req) == READ)
700 dasd_global_profile_data.dasd_read_nr_req[counter]++;
701 }
702
703 spin_lock(&block->profile.lock);
704 if (block->profile.data)
705 block->profile.data->dasd_io_nr_req[counter]++;
706 if (rq_data_dir(req) == READ)
707 block->profile.data->dasd_read_nr_req[counter]++;
708 spin_unlock(&block->profile.lock);
709
710 /*
711 * We count the request for the start device, even though it may run on
712 * some other device due to error recovery. This way we make sure that
713 * we count each request only once.
714 */
715 device = cqr->startdev;
716 if (device->profile.data) {
717 counter = 1; /* request is not yet queued on the start device */
718 list_for_each(l, &device->ccw_queue)
719 if (++counter >= 31)
720 break;
721 }
722 spin_lock(&device->profile.lock);
723 if (device->profile.data) {
724 device->profile.data->dasd_io_nr_req[counter]++;
725 if (rq_data_dir(req) == READ)
726 device->profile.data->dasd_read_nr_req[counter]++;
727 }
728 spin_unlock(&device->profile.lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700729}
730
731/*
732 * Add profiling information for cqr after execution.
733 */
Stefan Weinhuber4fa52aa2011-07-24 10:48:32 +0200734
735#define dasd_profile_counter(value, index) \
736{ \
737 for (index = 0; index < 31 && value >> (2+index); index++) \
738 ; \
739}
740
741static void dasd_profile_end_add_data(struct dasd_profile_info *data,
742 int is_alias,
743 int is_tpm,
744 int is_read,
745 long sectors,
746 int sectors_ind,
747 int tottime_ind,
748 int tottimeps_ind,
749 int strtime_ind,
750 int irqtime_ind,
751 int irqtimeps_ind,
752 int endtime_ind)
753{
754 /* in case of an overflow, reset the whole profile */
755 if (data->dasd_io_reqs == UINT_MAX) {
756 memset(data, 0, sizeof(*data));
757 getnstimeofday(&data->starttod);
758 }
759 data->dasd_io_reqs++;
760 data->dasd_io_sects += sectors;
761 if (is_alias)
762 data->dasd_io_alias++;
763 if (is_tpm)
764 data->dasd_io_tpm++;
765
766 data->dasd_io_secs[sectors_ind]++;
767 data->dasd_io_times[tottime_ind]++;
768 data->dasd_io_timps[tottimeps_ind]++;
769 data->dasd_io_time1[strtime_ind]++;
770 data->dasd_io_time2[irqtime_ind]++;
771 data->dasd_io_time2ps[irqtimeps_ind]++;
772 data->dasd_io_time3[endtime_ind]++;
773
774 if (is_read) {
775 data->dasd_read_reqs++;
776 data->dasd_read_sects += sectors;
777 if (is_alias)
778 data->dasd_read_alias++;
779 if (is_tpm)
780 data->dasd_read_tpm++;
781 data->dasd_read_secs[sectors_ind]++;
782 data->dasd_read_times[tottime_ind]++;
783 data->dasd_read_time1[strtime_ind]++;
784 data->dasd_read_time2[irqtime_ind]++;
785 data->dasd_read_time3[endtime_ind]++;
786 }
787}
788
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100789static void dasd_profile_end(struct dasd_block *block,
790 struct dasd_ccw_req *cqr,
791 struct request *req)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700792{
793 long strtime, irqtime, endtime, tottime; /* in microseconds */
794 long tottimeps, sectors;
Stefan Weinhuber4fa52aa2011-07-24 10:48:32 +0200795 struct dasd_device *device;
796 int sectors_ind, tottime_ind, tottimeps_ind, strtime_ind;
797 int irqtime_ind, irqtimeps_ind, endtime_ind;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700798
Stefan Weinhuber4fa52aa2011-07-24 10:48:32 +0200799 device = cqr->startdev;
800 if (!(dasd_global_profile_level ||
801 block->profile.data ||
802 device->profile.data))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700803 return;
804
Tejun Heo83096eb2009-05-07 22:24:39 +0900805 sectors = blk_rq_sectors(req);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700806 if (!cqr->buildclk || !cqr->startclk ||
807 !cqr->stopclk || !cqr->endclk ||
808 !sectors)
809 return;
810
811 strtime = ((cqr->startclk - cqr->buildclk) >> 12);
812 irqtime = ((cqr->stopclk - cqr->startclk) >> 12);
813 endtime = ((cqr->endclk - cqr->stopclk) >> 12);
814 tottime = ((cqr->endclk - cqr->buildclk) >> 12);
815 tottimeps = tottime / sectors;
816
Stefan Weinhuber4fa52aa2011-07-24 10:48:32 +0200817 dasd_profile_counter(sectors, sectors_ind);
818 dasd_profile_counter(tottime, tottime_ind);
819 dasd_profile_counter(tottimeps, tottimeps_ind);
820 dasd_profile_counter(strtime, strtime_ind);
821 dasd_profile_counter(irqtime, irqtime_ind);
822 dasd_profile_counter(irqtime / sectors, irqtimeps_ind);
823 dasd_profile_counter(endtime, endtime_ind);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700824
Stefan Weinhuber4fa52aa2011-07-24 10:48:32 +0200825 if (dasd_global_profile_level) {
826 dasd_profile_end_add_data(&dasd_global_profile_data,
827 cqr->startdev != block->base,
828 cqr->cpmode == 1,
829 rq_data_dir(req) == READ,
830 sectors, sectors_ind, tottime_ind,
831 tottimeps_ind, strtime_ind,
832 irqtime_ind, irqtimeps_ind,
833 endtime_ind);
834 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700835
Stefan Weinhuber4fa52aa2011-07-24 10:48:32 +0200836 spin_lock(&block->profile.lock);
837 if (block->profile.data)
838 dasd_profile_end_add_data(block->profile.data,
839 cqr->startdev != block->base,
840 cqr->cpmode == 1,
841 rq_data_dir(req) == READ,
842 sectors, sectors_ind, tottime_ind,
843 tottimeps_ind, strtime_ind,
844 irqtime_ind, irqtimeps_ind,
845 endtime_ind);
846 spin_unlock(&block->profile.lock);
847
848 spin_lock(&device->profile.lock);
849 if (device->profile.data)
850 dasd_profile_end_add_data(device->profile.data,
851 cqr->startdev != block->base,
852 cqr->cpmode == 1,
853 rq_data_dir(req) == READ,
854 sectors, sectors_ind, tottime_ind,
855 tottimeps_ind, strtime_ind,
856 irqtime_ind, irqtimeps_ind,
857 endtime_ind);
858 spin_unlock(&device->profile.lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700859}
Stefan Weinhuber4fa52aa2011-07-24 10:48:32 +0200860
861void dasd_profile_reset(struct dasd_profile *profile)
862{
863 struct dasd_profile_info *data;
864
865 spin_lock_bh(&profile->lock);
866 data = profile->data;
867 if (!data) {
868 spin_unlock_bh(&profile->lock);
869 return;
870 }
871 memset(data, 0, sizeof(*data));
872 getnstimeofday(&data->starttod);
873 spin_unlock_bh(&profile->lock);
874}
875
876void dasd_global_profile_reset(void)
877{
878 memset(&dasd_global_profile_data, 0, sizeof(dasd_global_profile_data));
879 getnstimeofday(&dasd_global_profile_data.starttod);
880}
881
882int dasd_profile_on(struct dasd_profile *profile)
883{
884 struct dasd_profile_info *data;
885
886 data = kzalloc(sizeof(*data), GFP_KERNEL);
887 if (!data)
888 return -ENOMEM;
889 spin_lock_bh(&profile->lock);
890 if (profile->data) {
891 spin_unlock_bh(&profile->lock);
892 kfree(data);
893 return 0;
894 }
895 getnstimeofday(&data->starttod);
896 profile->data = data;
897 spin_unlock_bh(&profile->lock);
898 return 0;
899}
900
901void dasd_profile_off(struct dasd_profile *profile)
902{
903 spin_lock_bh(&profile->lock);
904 kfree(profile->data);
905 profile->data = NULL;
906 spin_unlock_bh(&profile->lock);
907}
908
909char *dasd_get_user_string(const char __user *user_buf, size_t user_len)
910{
911 char *buffer;
912
Stefan Weinhubere4258d52011-08-03 16:44:20 +0200913 buffer = vmalloc(user_len + 1);
Stefan Weinhuber4fa52aa2011-07-24 10:48:32 +0200914 if (buffer == NULL)
915 return ERR_PTR(-ENOMEM);
916 if (copy_from_user(buffer, user_buf, user_len) != 0) {
Stefan Weinhubere4258d52011-08-03 16:44:20 +0200917 vfree(buffer);
Stefan Weinhuber4fa52aa2011-07-24 10:48:32 +0200918 return ERR_PTR(-EFAULT);
919 }
920 /* got the string, now strip linefeed. */
921 if (buffer[user_len - 1] == '\n')
922 buffer[user_len - 1] = 0;
923 else
924 buffer[user_len] = 0;
925 return buffer;
926}
927
928static ssize_t dasd_stats_write(struct file *file,
929 const char __user *user_buf,
930 size_t user_len, loff_t *pos)
931{
932 char *buffer, *str;
933 int rc;
934 struct seq_file *m = (struct seq_file *)file->private_data;
935 struct dasd_profile *prof = m->private;
936
937 if (user_len > 65536)
938 user_len = 65536;
939 buffer = dasd_get_user_string(user_buf, user_len);
940 if (IS_ERR(buffer))
941 return PTR_ERR(buffer);
942
943 str = skip_spaces(buffer);
944 rc = user_len;
945 if (strncmp(str, "reset", 5) == 0) {
946 dasd_profile_reset(prof);
947 } else if (strncmp(str, "on", 2) == 0) {
948 rc = dasd_profile_on(prof);
949 if (!rc)
950 rc = user_len;
951 } else if (strncmp(str, "off", 3) == 0) {
952 dasd_profile_off(prof);
953 } else
954 rc = -EINVAL;
Stefan Weinhubere4258d52011-08-03 16:44:20 +0200955 vfree(buffer);
Stefan Weinhuber4fa52aa2011-07-24 10:48:32 +0200956 return rc;
957}
958
959static void dasd_stats_array(struct seq_file *m, unsigned int *array)
960{
961 int i;
962
963 for (i = 0; i < 32; i++)
964 seq_printf(m, "%u ", array[i]);
965 seq_putc(m, '\n');
966}
967
968static void dasd_stats_seq_print(struct seq_file *m,
969 struct dasd_profile_info *data)
970{
971 seq_printf(m, "start_time %ld.%09ld\n",
972 data->starttod.tv_sec, data->starttod.tv_nsec);
973 seq_printf(m, "total_requests %u\n", data->dasd_io_reqs);
974 seq_printf(m, "total_sectors %u\n", data->dasd_io_sects);
975 seq_printf(m, "total_pav %u\n", data->dasd_io_alias);
976 seq_printf(m, "total_hpf %u\n", data->dasd_io_tpm);
977 seq_printf(m, "histogram_sectors ");
978 dasd_stats_array(m, data->dasd_io_secs);
979 seq_printf(m, "histogram_io_times ");
980 dasd_stats_array(m, data->dasd_io_times);
981 seq_printf(m, "histogram_io_times_weighted ");
982 dasd_stats_array(m, data->dasd_io_timps);
983 seq_printf(m, "histogram_time_build_to_ssch ");
984 dasd_stats_array(m, data->dasd_io_time1);
985 seq_printf(m, "histogram_time_ssch_to_irq ");
986 dasd_stats_array(m, data->dasd_io_time2);
987 seq_printf(m, "histogram_time_ssch_to_irq_weighted ");
988 dasd_stats_array(m, data->dasd_io_time2ps);
989 seq_printf(m, "histogram_time_irq_to_end ");
990 dasd_stats_array(m, data->dasd_io_time3);
991 seq_printf(m, "histogram_ccw_queue_length ");
992 dasd_stats_array(m, data->dasd_io_nr_req);
993 seq_printf(m, "total_read_requests %u\n", data->dasd_read_reqs);
994 seq_printf(m, "total_read_sectors %u\n", data->dasd_read_sects);
995 seq_printf(m, "total_read_pav %u\n", data->dasd_read_alias);
996 seq_printf(m, "total_read_hpf %u\n", data->dasd_read_tpm);
997 seq_printf(m, "histogram_read_sectors ");
998 dasd_stats_array(m, data->dasd_read_secs);
999 seq_printf(m, "histogram_read_times ");
1000 dasd_stats_array(m, data->dasd_read_times);
1001 seq_printf(m, "histogram_read_time_build_to_ssch ");
1002 dasd_stats_array(m, data->dasd_read_time1);
1003 seq_printf(m, "histogram_read_time_ssch_to_irq ");
1004 dasd_stats_array(m, data->dasd_read_time2);
1005 seq_printf(m, "histogram_read_time_irq_to_end ");
1006 dasd_stats_array(m, data->dasd_read_time3);
1007 seq_printf(m, "histogram_read_ccw_queue_length ");
1008 dasd_stats_array(m, data->dasd_read_nr_req);
1009}
1010
1011static int dasd_stats_show(struct seq_file *m, void *v)
1012{
1013 struct dasd_profile *profile;
1014 struct dasd_profile_info *data;
1015
1016 profile = m->private;
1017 spin_lock_bh(&profile->lock);
1018 data = profile->data;
1019 if (!data) {
1020 spin_unlock_bh(&profile->lock);
1021 seq_printf(m, "disabled\n");
1022 return 0;
1023 }
1024 dasd_stats_seq_print(m, data);
1025 spin_unlock_bh(&profile->lock);
1026 return 0;
1027}
1028
1029static int dasd_stats_open(struct inode *inode, struct file *file)
1030{
1031 struct dasd_profile *profile = inode->i_private;
1032 return single_open(file, dasd_stats_show, profile);
1033}
1034
1035static const struct file_operations dasd_stats_raw_fops = {
1036 .owner = THIS_MODULE,
1037 .open = dasd_stats_open,
1038 .read = seq_read,
1039 .llseek = seq_lseek,
1040 .release = single_release,
1041 .write = dasd_stats_write,
1042};
1043
1044static ssize_t dasd_stats_global_write(struct file *file,
1045 const char __user *user_buf,
1046 size_t user_len, loff_t *pos)
1047{
1048 char *buffer, *str;
1049 ssize_t rc;
1050
1051 if (user_len > 65536)
1052 user_len = 65536;
1053 buffer = dasd_get_user_string(user_buf, user_len);
1054 if (IS_ERR(buffer))
1055 return PTR_ERR(buffer);
1056 str = skip_spaces(buffer);
1057 rc = user_len;
1058 if (strncmp(str, "reset", 5) == 0) {
1059 dasd_global_profile_reset();
1060 } else if (strncmp(str, "on", 2) == 0) {
1061 dasd_global_profile_reset();
1062 dasd_global_profile_level = DASD_PROFILE_GLOBAL_ONLY;
1063 } else if (strncmp(str, "off", 3) == 0) {
1064 dasd_global_profile_level = DASD_PROFILE_OFF;
1065 } else
1066 rc = -EINVAL;
Stefan Weinhubere4258d52011-08-03 16:44:20 +02001067 vfree(buffer);
Stefan Weinhuber4fa52aa2011-07-24 10:48:32 +02001068 return rc;
1069}
1070
1071static int dasd_stats_global_show(struct seq_file *m, void *v)
1072{
1073 if (!dasd_global_profile_level) {
1074 seq_printf(m, "disabled\n");
1075 return 0;
1076 }
1077 dasd_stats_seq_print(m, &dasd_global_profile_data);
1078 return 0;
1079}
1080
1081static int dasd_stats_global_open(struct inode *inode, struct file *file)
1082{
1083 return single_open(file, dasd_stats_global_show, NULL);
1084}
1085
1086static const struct file_operations dasd_stats_global_fops = {
1087 .owner = THIS_MODULE,
1088 .open = dasd_stats_global_open,
1089 .read = seq_read,
1090 .llseek = seq_lseek,
1091 .release = single_release,
1092 .write = dasd_stats_global_write,
1093};
1094
1095static void dasd_profile_init(struct dasd_profile *profile,
1096 struct dentry *base_dentry)
1097{
Al Virof4ae40a2011-07-24 04:33:43 -04001098 umode_t mode;
Stefan Weinhuber4fa52aa2011-07-24 10:48:32 +02001099 struct dentry *pde;
1100
1101 if (!base_dentry)
1102 return;
1103 profile->dentry = NULL;
1104 profile->data = NULL;
1105 mode = (S_IRUSR | S_IWUSR | S_IFREG);
1106 pde = debugfs_create_file("statistics", mode, base_dentry,
1107 profile, &dasd_stats_raw_fops);
1108 if (pde && !IS_ERR(pde))
1109 profile->dentry = pde;
1110 return;
1111}
1112
1113static void dasd_profile_exit(struct dasd_profile *profile)
1114{
1115 dasd_profile_off(profile);
1116 if (profile->dentry) {
1117 debugfs_remove(profile->dentry);
1118 profile->dentry = NULL;
1119 }
1120}
1121
1122static void dasd_statistics_removeroot(void)
1123{
1124 dasd_global_profile_level = DASD_PROFILE_OFF;
1125 if (dasd_global_profile_dentry) {
1126 debugfs_remove(dasd_global_profile_dentry);
1127 dasd_global_profile_dentry = NULL;
1128 }
1129 if (dasd_debugfs_global_entry)
1130 debugfs_remove(dasd_debugfs_global_entry);
1131 if (dasd_debugfs_root_entry)
1132 debugfs_remove(dasd_debugfs_root_entry);
1133}
1134
1135static void dasd_statistics_createroot(void)
1136{
Al Virof4ae40a2011-07-24 04:33:43 -04001137 umode_t mode;
Stefan Weinhuber4fa52aa2011-07-24 10:48:32 +02001138 struct dentry *pde;
1139
1140 dasd_debugfs_root_entry = NULL;
1141 dasd_debugfs_global_entry = NULL;
1142 dasd_global_profile_dentry = NULL;
1143 pde = debugfs_create_dir("dasd", NULL);
1144 if (!pde || IS_ERR(pde))
1145 goto error;
1146 dasd_debugfs_root_entry = pde;
1147 pde = debugfs_create_dir("global", dasd_debugfs_root_entry);
1148 if (!pde || IS_ERR(pde))
1149 goto error;
1150 dasd_debugfs_global_entry = pde;
1151
1152 mode = (S_IRUSR | S_IWUSR | S_IFREG);
1153 pde = debugfs_create_file("statistics", mode, dasd_debugfs_global_entry,
1154 NULL, &dasd_stats_global_fops);
1155 if (!pde || IS_ERR(pde))
1156 goto error;
1157 dasd_global_profile_dentry = pde;
1158 return;
1159
1160error:
1161 DBF_EVENT(DBF_ERR, "%s",
1162 "Creation of the dasd debugfs interface failed");
1163 dasd_statistics_removeroot();
1164 return;
1165}
1166
Linus Torvalds1da177e2005-04-16 15:20:36 -07001167#else
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001168#define dasd_profile_start(block, cqr, req) do {} while (0)
1169#define dasd_profile_end(block, cqr, req) do {} while (0)
Stefan Weinhuber4fa52aa2011-07-24 10:48:32 +02001170
1171static void dasd_statistics_createroot(void)
1172{
1173 return;
1174}
1175
1176static void dasd_statistics_removeroot(void)
1177{
1178 return;
1179}
1180
1181int dasd_stats_generic_show(struct seq_file *m, void *v)
1182{
1183 seq_printf(m, "Statistics are not activated in this kernel\n");
1184 return 0;
1185}
1186
1187static void dasd_profile_init(struct dasd_profile *profile,
1188 struct dentry *base_dentry)
1189{
1190 return;
1191}
1192
1193static void dasd_profile_exit(struct dasd_profile *profile)
1194{
1195 return;
1196}
1197
1198int dasd_profile_on(struct dasd_profile *profile)
1199{
1200 return 0;
1201}
1202
Linus Torvalds1da177e2005-04-16 15:20:36 -07001203#endif /* CONFIG_DASD_PROFILE */
1204
1205/*
1206 * Allocate memory for a channel program with 'cplength' channel
1207 * command words and 'datasize' additional space. There are two
1208 * variantes: 1) dasd_kmalloc_request uses kmalloc to get the needed
1209 * memory and 2) dasd_smalloc_request uses the static ccw memory
1210 * that gets allocated for each device.
1211 */
Stefan Haberland68b781f2009-09-11 10:28:29 +02001212struct dasd_ccw_req *dasd_kmalloc_request(int magic, int cplength,
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001213 int datasize,
1214 struct dasd_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001215{
1216 struct dasd_ccw_req *cqr;
1217
1218 /* Sanity checks */
Stefan Haberland68b781f2009-09-11 10:28:29 +02001219 BUG_ON(datasize > PAGE_SIZE ||
Eric Sesterhenn7ac1e872006-03-24 18:48:13 +01001220 (cplength*sizeof(struct ccw1)) > PAGE_SIZE);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001221
Eric Sesterhenn88abaab2006-03-24 03:15:31 -08001222 cqr = kzalloc(sizeof(struct dasd_ccw_req), GFP_ATOMIC);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001223 if (cqr == NULL)
1224 return ERR_PTR(-ENOMEM);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001225 cqr->cpaddr = NULL;
1226 if (cplength > 0) {
Eric Sesterhenn88abaab2006-03-24 03:15:31 -08001227 cqr->cpaddr = kcalloc(cplength, sizeof(struct ccw1),
Linus Torvalds1da177e2005-04-16 15:20:36 -07001228 GFP_ATOMIC | GFP_DMA);
1229 if (cqr->cpaddr == NULL) {
1230 kfree(cqr);
1231 return ERR_PTR(-ENOMEM);
1232 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001233 }
1234 cqr->data = NULL;
1235 if (datasize > 0) {
Eric Sesterhenn88abaab2006-03-24 03:15:31 -08001236 cqr->data = kzalloc(datasize, GFP_ATOMIC | GFP_DMA);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001237 if (cqr->data == NULL) {
Jesper Juhl17fd6822005-11-07 01:01:30 -08001238 kfree(cqr->cpaddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001239 kfree(cqr);
1240 return ERR_PTR(-ENOMEM);
1241 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001242 }
Stefan Haberland68b781f2009-09-11 10:28:29 +02001243 cqr->magic = magic;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001244 set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
1245 dasd_get_device(device);
1246 return cqr;
1247}
1248
Stefan Haberland68b781f2009-09-11 10:28:29 +02001249struct dasd_ccw_req *dasd_smalloc_request(int magic, int cplength,
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001250 int datasize,
1251 struct dasd_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001252{
1253 unsigned long flags;
1254 struct dasd_ccw_req *cqr;
1255 char *data;
1256 int size;
1257
Linus Torvalds1da177e2005-04-16 15:20:36 -07001258 size = (sizeof(struct dasd_ccw_req) + 7L) & -8L;
1259 if (cplength > 0)
1260 size += cplength * sizeof(struct ccw1);
1261 if (datasize > 0)
1262 size += datasize;
1263 spin_lock_irqsave(&device->mem_lock, flags);
1264 cqr = (struct dasd_ccw_req *)
1265 dasd_alloc_chunk(&device->ccw_chunks, size);
1266 spin_unlock_irqrestore(&device->mem_lock, flags);
1267 if (cqr == NULL)
1268 return ERR_PTR(-ENOMEM);
1269 memset(cqr, 0, sizeof(struct dasd_ccw_req));
1270 data = (char *) cqr + ((sizeof(struct dasd_ccw_req) + 7L) & -8L);
1271 cqr->cpaddr = NULL;
1272 if (cplength > 0) {
1273 cqr->cpaddr = (struct ccw1 *) data;
1274 data += cplength*sizeof(struct ccw1);
1275 memset(cqr->cpaddr, 0, cplength*sizeof(struct ccw1));
1276 }
1277 cqr->data = NULL;
1278 if (datasize > 0) {
1279 cqr->data = data;
1280 memset(cqr->data, 0, datasize);
1281 }
Stefan Haberland68b781f2009-09-11 10:28:29 +02001282 cqr->magic = magic;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001283 set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
1284 dasd_get_device(device);
1285 return cqr;
1286}
1287
1288/*
1289 * Free memory of a channel program. This function needs to free all the
1290 * idal lists that might have been created by dasd_set_cda and the
1291 * struct dasd_ccw_req itself.
1292 */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001293void dasd_kfree_request(struct dasd_ccw_req *cqr, struct dasd_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001294{
Martin Schwidefsky347a8dc2006-01-06 00:19:28 -08001295#ifdef CONFIG_64BIT
Linus Torvalds1da177e2005-04-16 15:20:36 -07001296 struct ccw1 *ccw;
1297
1298 /* Clear any idals used for the request. */
1299 ccw = cqr->cpaddr;
1300 do {
1301 clear_normalized_cda(ccw);
1302 } while (ccw++->flags & (CCW_FLAG_CC | CCW_FLAG_DC));
1303#endif
Jesper Juhl17fd6822005-11-07 01:01:30 -08001304 kfree(cqr->cpaddr);
1305 kfree(cqr->data);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001306 kfree(cqr);
1307 dasd_put_device(device);
1308}
1309
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001310void dasd_sfree_request(struct dasd_ccw_req *cqr, struct dasd_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001311{
1312 unsigned long flags;
1313
1314 spin_lock_irqsave(&device->mem_lock, flags);
1315 dasd_free_chunk(&device->ccw_chunks, cqr);
1316 spin_unlock_irqrestore(&device->mem_lock, flags);
1317 dasd_put_device(device);
1318}
1319
1320/*
1321 * Check discipline magic in cqr.
1322 */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001323static inline int dasd_check_cqr(struct dasd_ccw_req *cqr)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001324{
1325 struct dasd_device *device;
1326
1327 if (cqr == NULL)
1328 return -EINVAL;
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001329 device = cqr->startdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001330 if (strncmp((char *) &cqr->magic, device->discipline->ebcname, 4)) {
Stefan Haberlandfc19f382009-03-26 15:23:49 +01001331 DBF_DEV_EVENT(DBF_WARNING, device,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001332 " dasd_ccw_req 0x%08x magic doesn't match"
1333 " discipline 0x%08x",
1334 cqr->magic,
1335 *(unsigned int *) device->discipline->name);
1336 return -EINVAL;
1337 }
1338 return 0;
1339}
1340
1341/*
1342 * Terminate the current i/o and set the request to clear_pending.
1343 * Timer keeps device runnig.
1344 * ccw_device_clear can fail if the i/o subsystem
1345 * is in a bad mood.
1346 */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001347int dasd_term_IO(struct dasd_ccw_req *cqr)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001348{
1349 struct dasd_device *device;
1350 int retries, rc;
Stefan Haberlandfc19f382009-03-26 15:23:49 +01001351 char errorstring[ERRORLENGTH];
Linus Torvalds1da177e2005-04-16 15:20:36 -07001352
1353 /* Check the cqr */
1354 rc = dasd_check_cqr(cqr);
1355 if (rc)
1356 return rc;
1357 retries = 0;
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001358 device = (struct dasd_device *) cqr->startdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001359 while ((retries < 5) && (cqr->status == DASD_CQR_IN_IO)) {
1360 rc = ccw_device_clear(device->cdev, (long) cqr);
1361 switch (rc) {
1362 case 0: /* termination successful */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001363 cqr->status = DASD_CQR_CLEAR_PENDING;
Heiko Carstens1aae0562013-01-30 09:49:40 +01001364 cqr->stopclk = get_tod_clock();
Horst Hummel8f617012006-08-30 14:33:33 +02001365 cqr->starttime = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001366 DBF_DEV_EVENT(DBF_DEBUG, device,
1367 "terminate cqr %p successful",
1368 cqr);
1369 break;
1370 case -ENODEV:
1371 DBF_DEV_EVENT(DBF_ERR, device, "%s",
1372 "device gone, retry");
1373 break;
1374 case -EIO:
1375 DBF_DEV_EVENT(DBF_ERR, device, "%s",
1376 "I/O error, retry");
1377 break;
1378 case -EINVAL:
1379 case -EBUSY:
1380 DBF_DEV_EVENT(DBF_ERR, device, "%s",
1381 "device busy, retry later");
1382 break;
1383 default:
Stefan Haberlandfc19f382009-03-26 15:23:49 +01001384 /* internal error 10 - unknown rc*/
1385 snprintf(errorstring, ERRORLENGTH, "10 %d", rc);
1386 dev_err(&device->cdev->dev, "An error occurred in the "
1387 "DASD device driver, reason=%s\n", errorstring);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001388 BUG();
1389 break;
1390 }
1391 retries++;
1392 }
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001393 dasd_schedule_device_bh(device);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001394 return rc;
1395}
1396
1397/*
1398 * Start the i/o. This start_IO can fail if the channel is really busy.
1399 * In that case set up a timer to start the request later.
1400 */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001401int dasd_start_IO(struct dasd_ccw_req *cqr)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001402{
1403 struct dasd_device *device;
1404 int rc;
Stefan Haberlandfc19f382009-03-26 15:23:49 +01001405 char errorstring[ERRORLENGTH];
Linus Torvalds1da177e2005-04-16 15:20:36 -07001406
1407 /* Check the cqr */
1408 rc = dasd_check_cqr(cqr);
Stefan Weinhuber6cc7f162009-06-12 10:26:39 +02001409 if (rc) {
1410 cqr->intrc = rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001411 return rc;
Stefan Weinhuber6cc7f162009-06-12 10:26:39 +02001412 }
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001413 device = (struct dasd_device *) cqr->startdev;
Stefan Weinhuber5a27e602011-01-05 12:48:04 +01001414 if (((cqr->block &&
1415 test_bit(DASD_FLAG_LOCK_STOLEN, &cqr->block->base->flags)) ||
1416 test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags)) &&
1417 !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) {
1418 DBF_DEV_EVENT(DBF_DEBUG, device, "start_IO: return request %p "
1419 "because of stolen lock", cqr);
1420 cqr->status = DASD_CQR_ERROR;
1421 cqr->intrc = -EPERM;
1422 return -EPERM;
1423 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001424 if (cqr->retries < 0) {
Stefan Haberlandfc19f382009-03-26 15:23:49 +01001425 /* internal error 14 - start_IO run out of retries */
1426 sprintf(errorstring, "14 %p", cqr);
1427 dev_err(&device->cdev->dev, "An error occurred in the DASD "
1428 "device driver, reason=%s\n", errorstring);
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001429 cqr->status = DASD_CQR_ERROR;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001430 return -EIO;
1431 }
Heiko Carstens1aae0562013-01-30 09:49:40 +01001432 cqr->startclk = get_tod_clock();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001433 cqr->starttime = jiffies;
1434 cqr->retries--;
Stefan Weinhubera4d26c62011-01-05 12:48:03 +01001435 if (!test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags)) {
1436 cqr->lpm &= device->path_data.opm;
1437 if (!cqr->lpm)
1438 cqr->lpm = device->path_data.opm;
1439 }
Stefan Weinhuberf3eb5382009-03-26 15:23:48 +01001440 if (cqr->cpmode == 1) {
1441 rc = ccw_device_tm_start(device->cdev, cqr->cpaddr,
1442 (long) cqr, cqr->lpm);
1443 } else {
1444 rc = ccw_device_start(device->cdev, cqr->cpaddr,
1445 (long) cqr, cqr->lpm, 0);
1446 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001447 switch (rc) {
1448 case 0:
1449 cqr->status = DASD_CQR_IN_IO;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001450 break;
1451 case -EBUSY:
Stefan Weinhubera4d26c62011-01-05 12:48:03 +01001452 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
Linus Torvalds1da177e2005-04-16 15:20:36 -07001453 "start_IO: device busy, retry later");
1454 break;
1455 case -ETIMEDOUT:
Stefan Weinhubera4d26c62011-01-05 12:48:03 +01001456 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
Linus Torvalds1da177e2005-04-16 15:20:36 -07001457 "start_IO: request timeout, retry later");
1458 break;
1459 case -EACCES:
Stefan Weinhubera4d26c62011-01-05 12:48:03 +01001460 /* -EACCES indicates that the request used only a subset of the
1461 * available paths and all these paths are gone. If the lpm of
1462 * this request was only a subset of the opm (e.g. the ppm) then
1463 * we just do a retry with all available paths.
1464 * If we already use the full opm, something is amiss, and we
1465 * need a full path verification.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001466 */
Stefan Weinhubera4d26c62011-01-05 12:48:03 +01001467 if (test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags)) {
1468 DBF_DEV_EVENT(DBF_WARNING, device,
1469 "start_IO: selected paths gone (%x)",
1470 cqr->lpm);
1471 } else if (cqr->lpm != device->path_data.opm) {
1472 cqr->lpm = device->path_data.opm;
1473 DBF_DEV_EVENT(DBF_DEBUG, device, "%s",
1474 "start_IO: selected paths gone,"
1475 " retry on all paths");
1476 } else {
1477 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1478 "start_IO: all paths in opm gone,"
1479 " do path verification");
1480 dasd_generic_last_path_gone(device);
1481 device->path_data.opm = 0;
1482 device->path_data.ppm = 0;
1483 device->path_data.npm = 0;
1484 device->path_data.tbvpm =
1485 ccw_device_get_path_mask(device->cdev);
1486 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001487 break;
1488 case -ENODEV:
Stefan Weinhubera4d26c62011-01-05 12:48:03 +01001489 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
Stefan Weinhuberf3eb5382009-03-26 15:23:48 +01001490 "start_IO: -ENODEV device gone, retry");
1491 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001492 case -EIO:
Stefan Weinhubera4d26c62011-01-05 12:48:03 +01001493 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
Stefan Weinhuberf3eb5382009-03-26 15:23:48 +01001494 "start_IO: -EIO device gone, retry");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001495 break;
Stefan Haberlandd41dd122009-06-16 10:30:25 +02001496 case -EINVAL:
1497 /* most likely caused in power management context */
Stefan Weinhubera4d26c62011-01-05 12:48:03 +01001498 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
Stefan Haberlandd41dd122009-06-16 10:30:25 +02001499 "start_IO: -EINVAL device currently "
1500 "not accessible");
1501 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001502 default:
Stefan Haberlandfc19f382009-03-26 15:23:49 +01001503 /* internal error 11 - unknown rc */
1504 snprintf(errorstring, ERRORLENGTH, "11 %d", rc);
1505 dev_err(&device->cdev->dev,
1506 "An error occurred in the DASD device driver, "
1507 "reason=%s\n", errorstring);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001508 BUG();
1509 break;
1510 }
Stefan Weinhuber6cc7f162009-06-12 10:26:39 +02001511 cqr->intrc = rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001512 return rc;
1513}
1514
1515/*
1516 * Timeout function for dasd devices. This is used for different purposes
1517 * 1) missing interrupt handler for normal operation
1518 * 2) delayed start of request where start_IO failed with -EBUSY
1519 * 3) timeout for missing state change interrupts
1520 * The head of the ccw queue will have status DASD_CQR_IN_IO for 1),
1521 * DASD_CQR_QUEUED for 2) and 3).
1522 */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001523static void dasd_device_timeout(unsigned long ptr)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001524{
1525 unsigned long flags;
1526 struct dasd_device *device;
1527
1528 device = (struct dasd_device *) ptr;
1529 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
1530 /* re-activate request queue */
Stefan Weinhubereb6e1992009-12-07 12:51:51 +01001531 dasd_device_remove_stop_bits(device, DASD_STOPPED_PENDING);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001532 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001533 dasd_schedule_device_bh(device);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001534}
1535
1536/*
1537 * Setup timeout for a device in jiffies.
1538 */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001539void dasd_device_set_timer(struct dasd_device *device, int expires)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001540{
Stefan Weinhuber48cae882009-02-11 10:37:31 +01001541 if (expires == 0)
1542 del_timer(&device->timer);
1543 else
1544 mod_timer(&device->timer, jiffies + expires);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001545}
1546
1547/*
1548 * Clear timeout for a device.
1549 */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001550void dasd_device_clear_timer(struct dasd_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001551{
Stefan Weinhuber48cae882009-02-11 10:37:31 +01001552 del_timer(&device->timer);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001553}
1554
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001555static void dasd_handle_killed_request(struct ccw_device *cdev,
1556 unsigned long intparm)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001557{
1558 struct dasd_ccw_req *cqr;
1559 struct dasd_device *device;
1560
Stefan Weinhuberf16f5842008-05-15 16:52:36 +02001561 if (!intparm)
1562 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001563 cqr = (struct dasd_ccw_req *) intparm;
1564 if (cqr->status != DASD_CQR_IN_IO) {
Stefan Haberlandb8ed5dd2009-12-07 12:51:52 +01001565 DBF_EVENT_DEVID(DBF_DEBUG, cdev,
1566 "invalid status in handle_killed_request: "
1567 "%02x", cqr->status);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001568 return;
1569 }
1570
Stefan Haberland589c74d2010-02-26 22:37:47 +01001571 device = dasd_device_from_cdev_locked(cdev);
1572 if (IS_ERR(device)) {
1573 DBF_EVENT_DEVID(DBF_DEBUG, cdev, "%s",
1574 "unable to get device from cdev");
1575 return;
1576 }
1577
1578 if (!cqr->startdev ||
1579 device != cqr->startdev ||
1580 strncmp(cqr->startdev->discipline->ebcname,
1581 (char *) &cqr->magic, 4)) {
Stefan Haberland294001a2010-01-27 10:12:35 +01001582 DBF_EVENT_DEVID(DBF_DEBUG, cdev, "%s",
1583 "invalid device in request");
Stefan Haberland589c74d2010-02-26 22:37:47 +01001584 dasd_put_device(device);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001585 return;
1586 }
1587
1588 /* Schedule request to be retried. */
1589 cqr->status = DASD_CQR_QUEUED;
1590
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001591 dasd_device_clear_timer(device);
1592 dasd_schedule_device_bh(device);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001593 dasd_put_device(device);
1594}
1595
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001596void dasd_generic_handle_state_change(struct dasd_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001597{
Stefan Weinhuber20c64462006-03-24 03:15:25 -08001598 /* First of all start sense subsystem status request. */
1599 dasd_eer_snss(device);
1600
Stefan Weinhubereb6e1992009-12-07 12:51:51 +01001601 dasd_device_remove_stop_bits(device, DASD_STOPPED_PENDING);
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001602 dasd_schedule_device_bh(device);
1603 if (device->block)
1604 dasd_schedule_block_bh(device->block);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001605}
1606
1607/*
1608 * Interrupt handler for "normal" ssch-io based dasd devices.
1609 */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001610void dasd_int_handler(struct ccw_device *cdev, unsigned long intparm,
1611 struct irb *irb)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001612{
1613 struct dasd_ccw_req *cqr, *next;
1614 struct dasd_device *device;
1615 unsigned long long now;
1616 int expires;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001617
1618 if (IS_ERR(irb)) {
1619 switch (PTR_ERR(irb)) {
1620 case -EIO:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001621 break;
1622 case -ETIMEDOUT:
Stefan Haberlandb8ed5dd2009-12-07 12:51:52 +01001623 DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s: "
1624 "request timed out\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001625 break;
1626 default:
Stefan Haberlandb8ed5dd2009-12-07 12:51:52 +01001627 DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s: "
1628 "unknown error %ld\n", __func__,
1629 PTR_ERR(irb));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001630 }
Stefan Weinhuberf16f5842008-05-15 16:52:36 +02001631 dasd_handle_killed_request(cdev, intparm);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001632 return;
1633 }
1634
Heiko Carstens1aae0562013-01-30 09:49:40 +01001635 now = get_tod_clock();
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001636 cqr = (struct dasd_ccw_req *) intparm;
Stefan Weinhuber5a27e602011-01-05 12:48:04 +01001637 /* check for conditions that should be handled immediately */
1638 if (!cqr ||
1639 !(scsw_dstat(&irb->scsw) == (DEV_STAT_CHN_END | DEV_STAT_DEV_END) &&
1640 scsw_cstat(&irb->scsw) == 0)) {
Stefan Weinhubera5a00612010-10-25 16:10:47 +02001641 if (cqr)
1642 memcpy(&cqr->irb, irb, sizeof(*irb));
Martin Schwidefskya00bfd72006-09-20 15:59:05 +02001643 device = dasd_device_from_cdev_locked(cdev);
Stefan Haberland56b86b62010-10-25 16:10:49 +02001644 if (IS_ERR(device))
1645 return;
1646 /* ignore unsolicited interrupts for DIAG discipline */
1647 if (device->discipline == dasd_diag_discipline_pointer) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001648 dasd_put_device(device);
Stefan Haberland56b86b62010-10-25 16:10:49 +02001649 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001650 }
Stefan Weinhuber5a27e602011-01-05 12:48:04 +01001651 device->discipline->dump_sense_dbf(device, irb, "int");
1652 if (device->features & DASD_FEATURE_ERPLOG)
1653 device->discipline->dump_sense(device, cqr, irb);
1654 device->discipline->check_for_device_change(device, cqr, irb);
Stefan Haberland56b86b62010-10-25 16:10:49 +02001655 dasd_put_device(device);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001656 }
Stefan Weinhuber5a27e602011-01-05 12:48:04 +01001657 if (!cqr)
1658 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001659
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001660 device = (struct dasd_device *) cqr->startdev;
1661 if (!device ||
Linus Torvalds1da177e2005-04-16 15:20:36 -07001662 strncmp(device->discipline->ebcname, (char *) &cqr->magic, 4)) {
Stefan Haberland294001a2010-01-27 10:12:35 +01001663 DBF_EVENT_DEVID(DBF_DEBUG, cdev, "%s",
1664 "invalid device in request");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001665 return;
1666 }
1667
1668 /* Check for clear pending */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001669 if (cqr->status == DASD_CQR_CLEAR_PENDING &&
Stefan Weinhuberf3eb5382009-03-26 15:23:48 +01001670 scsw_fctl(&irb->scsw) & SCSW_FCTL_CLEAR_FUNC) {
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001671 cqr->status = DASD_CQR_CLEARED;
1672 dasd_device_clear_timer(device);
Horst Hummel8f617012006-08-30 14:33:33 +02001673 wake_up(&dasd_flush_wq);
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001674 dasd_schedule_device_bh(device);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001675 return;
1676 }
1677
Stefan Weinhuberf3eb5382009-03-26 15:23:48 +01001678 /* check status - the request might have been killed by dyn detach */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001679 if (cqr->status != DASD_CQR_IN_IO) {
Stefan Haberlandfc19f382009-03-26 15:23:49 +01001680 DBF_DEV_EVENT(DBF_DEBUG, device, "invalid status: bus_id %s, "
1681 "status %02x", dev_name(&cdev->dev), cqr->status);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001682 return;
1683 }
Stefan Haberlandfc19f382009-03-26 15:23:49 +01001684
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001685 next = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001686 expires = 0;
Stefan Weinhuberf3eb5382009-03-26 15:23:48 +01001687 if (scsw_dstat(&irb->scsw) == (DEV_STAT_CHN_END | DEV_STAT_DEV_END) &&
1688 scsw_cstat(&irb->scsw) == 0) {
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001689 /* request was completed successfully */
1690 cqr->status = DASD_CQR_SUCCESS;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001691 cqr->stopclk = now;
1692 /* Start first request on queue if possible -> fast_io. */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001693 if (cqr->devlist.next != &device->ccw_queue) {
1694 next = list_entry(cqr->devlist.next,
1695 struct dasd_ccw_req, devlist);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001696 }
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001697 } else { /* error */
Stefan Haberland6c5f57c2008-02-05 16:50:46 +01001698 /*
1699 * If we don't want complex ERP for this request, then just
1700 * reset this and retry it in the fastpath
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001701 */
Stefan Haberland6c5f57c2008-02-05 16:50:46 +01001702 if (!test_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags) &&
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001703 cqr->retries > 0) {
Stefan Weinhubera4d26c62011-01-05 12:48:03 +01001704 if (cqr->lpm == device->path_data.opm)
Stefan Haberlandfc19f382009-03-26 15:23:49 +01001705 DBF_DEV_EVENT(DBF_DEBUG, device,
1706 "default ERP in fastpath "
1707 "(%i retries left)",
1708 cqr->retries);
Stefan Weinhubera4d26c62011-01-05 12:48:03 +01001709 if (!test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags))
1710 cqr->lpm = device->path_data.opm;
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001711 cqr->status = DASD_CQR_QUEUED;
1712 next = cqr;
1713 } else
Linus Torvalds1da177e2005-04-16 15:20:36 -07001714 cqr->status = DASD_CQR_ERROR;
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001715 }
1716 if (next && (next->status == DASD_CQR_QUEUED) &&
1717 (!device->stopped)) {
1718 if (device->discipline->start_IO(next) == 0)
1719 expires = next->expires;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001720 }
1721 if (expires != 0)
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001722 dasd_device_set_timer(device, expires);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001723 else
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001724 dasd_device_clear_timer(device);
1725 dasd_schedule_device_bh(device);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001726}
1727
Stefan Haberlanda23ed002010-05-26 23:27:09 +02001728enum uc_todo dasd_generic_uc_handler(struct ccw_device *cdev, struct irb *irb)
1729{
1730 struct dasd_device *device;
1731
1732 device = dasd_device_from_cdev_locked(cdev);
1733
1734 if (IS_ERR(device))
1735 goto out;
1736 if (test_bit(DASD_FLAG_OFFLINE, &device->flags) ||
1737 device->state != device->target ||
Stefan Weinhuber5a27e602011-01-05 12:48:04 +01001738 !device->discipline->check_for_device_change){
Stefan Haberlanda23ed002010-05-26 23:27:09 +02001739 dasd_put_device(device);
1740 goto out;
1741 }
Stefan Weinhuber5a27e602011-01-05 12:48:04 +01001742 if (device->discipline->dump_sense_dbf)
1743 device->discipline->dump_sense_dbf(device, irb, "uc");
1744 device->discipline->check_for_device_change(device, NULL, irb);
Stefan Haberlanda23ed002010-05-26 23:27:09 +02001745 dasd_put_device(device);
1746out:
1747 return UC_TODO_RETRY;
1748}
1749EXPORT_SYMBOL_GPL(dasd_generic_uc_handler);
1750
Linus Torvalds1da177e2005-04-16 15:20:36 -07001751/*
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001752 * If we have an error on a dasd_block layer request then we cancel
1753 * and return all further requests from the same dasd_block as well.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001754 */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001755static void __dasd_device_recovery(struct dasd_device *device,
1756 struct dasd_ccw_req *ref_cqr)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001757{
1758 struct list_head *l, *n;
1759 struct dasd_ccw_req *cqr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001760
1761 /*
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001762 * only requeue request that came from the dasd_block layer
Linus Torvalds1da177e2005-04-16 15:20:36 -07001763 */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001764 if (!ref_cqr->block)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001765 return;
Horst Hummelf24acd42005-05-01 08:58:59 -07001766
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001767 list_for_each_safe(l, n, &device->ccw_queue) {
1768 cqr = list_entry(l, struct dasd_ccw_req, devlist);
1769 if (cqr->status == DASD_CQR_QUEUED &&
1770 ref_cqr->block == cqr->block) {
1771 cqr->status = DASD_CQR_CLEARED;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001772 }
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001773 }
1774};
1775
1776/*
1777 * Remove those ccw requests from the queue that need to be returned
1778 * to the upper layer.
1779 */
1780static void __dasd_device_process_ccw_queue(struct dasd_device *device,
1781 struct list_head *final_queue)
1782{
1783 struct list_head *l, *n;
1784 struct dasd_ccw_req *cqr;
1785
1786 /* Process request with final status. */
1787 list_for_each_safe(l, n, &device->ccw_queue) {
1788 cqr = list_entry(l, struct dasd_ccw_req, devlist);
1789
Hannes Reinecke1fbdb8b2013-01-30 09:26:13 +00001790 /* Skip any non-final request. */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001791 if (cqr->status == DASD_CQR_QUEUED ||
1792 cqr->status == DASD_CQR_IN_IO ||
1793 cqr->status == DASD_CQR_CLEAR_PENDING)
Hannes Reinecke1fbdb8b2013-01-30 09:26:13 +00001794 continue;
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001795 if (cqr->status == DASD_CQR_ERROR) {
1796 __dasd_device_recovery(device, cqr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001797 }
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001798 /* Rechain finished requests to final queue */
1799 list_move_tail(&cqr->devlist, final_queue);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001800 }
1801}
1802
1803/*
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001804 * the cqrs from the final queue are returned to the upper layer
1805 * by setting a dasd_block state and calling the callback function
1806 */
1807static void __dasd_device_process_final_queue(struct dasd_device *device,
1808 struct list_head *final_queue)
1809{
1810 struct list_head *l, *n;
1811 struct dasd_ccw_req *cqr;
Stefan Weinhuber03513bc2008-02-19 15:29:27 +01001812 struct dasd_block *block;
Stefan Haberlandc80ee722008-05-30 10:03:31 +02001813 void (*callback)(struct dasd_ccw_req *, void *data);
1814 void *callback_data;
Stefan Haberlandfc19f382009-03-26 15:23:49 +01001815 char errorstring[ERRORLENGTH];
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001816
1817 list_for_each_safe(l, n, final_queue) {
1818 cqr = list_entry(l, struct dasd_ccw_req, devlist);
1819 list_del_init(&cqr->devlist);
Stefan Weinhuber03513bc2008-02-19 15:29:27 +01001820 block = cqr->block;
Stefan Haberlandc80ee722008-05-30 10:03:31 +02001821 callback = cqr->callback;
1822 callback_data = cqr->callback_data;
Stefan Weinhuber03513bc2008-02-19 15:29:27 +01001823 if (block)
1824 spin_lock_bh(&block->queue_lock);
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001825 switch (cqr->status) {
1826 case DASD_CQR_SUCCESS:
1827 cqr->status = DASD_CQR_DONE;
1828 break;
1829 case DASD_CQR_ERROR:
1830 cqr->status = DASD_CQR_NEED_ERP;
1831 break;
1832 case DASD_CQR_CLEARED:
1833 cqr->status = DASD_CQR_TERMINATED;
1834 break;
1835 default:
Stefan Haberlandfc19f382009-03-26 15:23:49 +01001836 /* internal error 12 - wrong cqr status*/
1837 snprintf(errorstring, ERRORLENGTH, "12 %p %x02", cqr, cqr->status);
1838 dev_err(&device->cdev->dev,
1839 "An error occurred in the DASD device driver, "
1840 "reason=%s\n", errorstring);
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001841 BUG();
1842 }
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001843 if (cqr->callback != NULL)
Stefan Haberlandc80ee722008-05-30 10:03:31 +02001844 (callback)(cqr, callback_data);
Stefan Weinhuber03513bc2008-02-19 15:29:27 +01001845 if (block)
1846 spin_unlock_bh(&block->queue_lock);
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001847 }
1848}
1849
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001850/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07001851 * Take a look at the first request on the ccw queue and check
1852 * if it reached its expire time. If so, terminate the IO.
1853 */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001854static void __dasd_device_check_expire(struct dasd_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001855{
1856 struct dasd_ccw_req *cqr;
1857
1858 if (list_empty(&device->ccw_queue))
1859 return;
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001860 cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist);
Horst Hummel29145a62006-12-04 15:40:15 +01001861 if ((cqr->status == DASD_CQR_IN_IO && cqr->expires != 0) &&
1862 (time_after_eq(jiffies, cqr->expires + cqr->starttime))) {
Stefan Haberlandd07dc5d2012-11-28 13:43:38 +01001863 if (test_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags)) {
1864 /*
1865 * IO in safe offline processing should not
1866 * run out of retries
1867 */
1868 cqr->retries++;
1869 }
Horst Hummel29145a62006-12-04 15:40:15 +01001870 if (device->discipline->term_IO(cqr) != 0) {
1871 /* Hmpf, try again in 5 sec */
Stefan Haberlandfc19f382009-03-26 15:23:49 +01001872 dev_err(&device->cdev->dev,
Heiko Carstens625c94d2010-08-13 10:06:38 +02001873 "cqr %p timed out (%lus) but cannot be "
Stefan Haberlandfc19f382009-03-26 15:23:49 +01001874 "ended, retrying in 5 s\n",
1875 cqr, (cqr->expires/HZ));
Stefan Haberland7dc1da92008-01-26 14:11:26 +01001876 cqr->expires += 5*HZ;
1877 dasd_device_set_timer(device, 5*HZ);
Horst Hummel29145a62006-12-04 15:40:15 +01001878 } else {
Stefan Haberlandfc19f382009-03-26 15:23:49 +01001879 dev_err(&device->cdev->dev,
Heiko Carstens625c94d2010-08-13 10:06:38 +02001880 "cqr %p timed out (%lus), %i retries "
Stefan Haberlandfc19f382009-03-26 15:23:49 +01001881 "remaining\n", cqr, (cqr->expires/HZ),
1882 cqr->retries);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001883 }
1884 }
1885}
1886
1887/*
1888 * Take a look at the first request on the ccw queue and check
1889 * if it needs to be started.
1890 */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001891static void __dasd_device_start_head(struct dasd_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001892{
1893 struct dasd_ccw_req *cqr;
1894 int rc;
1895
1896 if (list_empty(&device->ccw_queue))
1897 return;
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001898 cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist);
Peter Oberparleiter25ee4cf2006-04-10 22:53:47 -07001899 if (cqr->status != DASD_CQR_QUEUED)
1900 return;
Stefan Weinhubera4d26c62011-01-05 12:48:03 +01001901 /* when device is stopped, return request to previous layer
1902 * exception: only the disconnect or unresumed bits are set and the
1903 * cqr is a path verification request
1904 */
1905 if (device->stopped &&
1906 !(!(device->stopped & ~(DASD_STOPPED_DC_WAIT | DASD_UNRESUMED_PM))
1907 && test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags))) {
1908 cqr->intrc = -EAGAIN;
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001909 cqr->status = DASD_CQR_CLEARED;
1910 dasd_schedule_device_bh(device);
Peter Oberparleiter25ee4cf2006-04-10 22:53:47 -07001911 return;
Horst Hummel1c01b8a2006-01-06 00:19:15 -08001912 }
Peter Oberparleiter25ee4cf2006-04-10 22:53:47 -07001913
1914 rc = device->discipline->start_IO(cqr);
1915 if (rc == 0)
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001916 dasd_device_set_timer(device, cqr->expires);
Peter Oberparleiter25ee4cf2006-04-10 22:53:47 -07001917 else if (rc == -EACCES) {
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001918 dasd_schedule_device_bh(device);
Peter Oberparleiter25ee4cf2006-04-10 22:53:47 -07001919 } else
1920 /* Hmpf, try again in 1/2 sec */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001921 dasd_device_set_timer(device, 50);
Horst Hummel8f617012006-08-30 14:33:33 +02001922}
1923
Stefan Weinhubera4d26c62011-01-05 12:48:03 +01001924static void __dasd_device_check_path_events(struct dasd_device *device)
1925{
1926 int rc;
1927
1928 if (device->path_data.tbvpm) {
1929 if (device->stopped & ~(DASD_STOPPED_DC_WAIT |
1930 DASD_UNRESUMED_PM))
1931 return;
1932 rc = device->discipline->verify_path(
1933 device, device->path_data.tbvpm);
1934 if (rc)
1935 dasd_device_set_timer(device, 50);
1936 else
1937 device->path_data.tbvpm = 0;
1938 }
1939};
1940
Linus Torvalds1da177e2005-04-16 15:20:36 -07001941/*
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001942 * Go through all request on the dasd_device request queue,
1943 * terminate them on the cdev if necessary, and return them to the
1944 * submitting layer via callback.
1945 * Note:
1946 * Make sure that all 'submitting layers' still exist when
1947 * this function is called!. In other words, when 'device' is a base
1948 * device then all block layer requests must have been removed before
1949 * via dasd_flush_block_queue.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001950 */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001951int dasd_flush_device_queue(struct dasd_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001952{
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001953 struct dasd_ccw_req *cqr, *n;
1954 int rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001955 struct list_head flush_queue;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001956
1957 INIT_LIST_HEAD(&flush_queue);
1958 spin_lock_irq(get_ccwdev_lock(device->cdev));
Horst Hummel8f617012006-08-30 14:33:33 +02001959 rc = 0;
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001960 list_for_each_entry_safe(cqr, n, &device->ccw_queue, devlist) {
Horst Hummel8f617012006-08-30 14:33:33 +02001961 /* Check status and move request to flush_queue */
1962 switch (cqr->status) {
1963 case DASD_CQR_IN_IO:
1964 rc = device->discipline->term_IO(cqr);
1965 if (rc) {
1966 /* unable to terminate requeust */
Stefan Haberlandfc19f382009-03-26 15:23:49 +01001967 dev_err(&device->cdev->dev,
1968 "Flushing the DASD request queue "
1969 "failed for request %p\n", cqr);
Horst Hummel8f617012006-08-30 14:33:33 +02001970 /* stop flush processing */
1971 goto finished;
1972 }
1973 break;
1974 case DASD_CQR_QUEUED:
Heiko Carstens1aae0562013-01-30 09:49:40 +01001975 cqr->stopclk = get_tod_clock();
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001976 cqr->status = DASD_CQR_CLEARED;
Horst Hummel8f617012006-08-30 14:33:33 +02001977 break;
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001978 default: /* no need to modify the others */
Horst Hummel8f617012006-08-30 14:33:33 +02001979 break;
1980 }
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001981 list_move_tail(&cqr->devlist, &flush_queue);
Horst Hummel8f617012006-08-30 14:33:33 +02001982 }
Horst Hummel8f617012006-08-30 14:33:33 +02001983finished:
1984 spin_unlock_irq(get_ccwdev_lock(device->cdev));
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001985 /*
1986 * After this point all requests must be in state CLEAR_PENDING,
1987 * CLEARED, SUCCESS or ERROR. Now wait for CLEAR_PENDING to become
1988 * one of the others.
1989 */
1990 list_for_each_entry_safe(cqr, n, &flush_queue, devlist)
1991 wait_event(dasd_flush_wq,
1992 (cqr->status != DASD_CQR_CLEAR_PENDING));
1993 /*
1994 * Now set each request back to TERMINATED, DONE or NEED_ERP
1995 * and call the callback function of flushed requests
1996 */
1997 __dasd_device_process_final_queue(device, &flush_queue);
Horst Hummel8f617012006-08-30 14:33:33 +02001998 return rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001999}
2000
2001/*
2002 * Acquire the device lock and process queues for the device.
2003 */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002004static void dasd_device_tasklet(struct dasd_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002005{
2006 struct list_head final_queue;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002007
2008 atomic_set (&device->tasklet_scheduled, 0);
2009 INIT_LIST_HEAD(&final_queue);
2010 spin_lock_irq(get_ccwdev_lock(device->cdev));
2011 /* Check expire time of first request on the ccw queue. */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002012 __dasd_device_check_expire(device);
2013 /* find final requests on ccw queue */
2014 __dasd_device_process_ccw_queue(device, &final_queue);
Stefan Weinhubera4d26c62011-01-05 12:48:03 +01002015 __dasd_device_check_path_events(device);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002016 spin_unlock_irq(get_ccwdev_lock(device->cdev));
2017 /* Now call the callback function of requests with final status */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002018 __dasd_device_process_final_queue(device, &final_queue);
2019 spin_lock_irq(get_ccwdev_lock(device->cdev));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002020 /* Now check if the head of the ccw queue needs to be started. */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002021 __dasd_device_start_head(device);
2022 spin_unlock_irq(get_ccwdev_lock(device->cdev));
Stefan Haberland4679e892012-06-19 17:30:12 +02002023 if (waitqueue_active(&shutdown_waitq))
2024 wake_up(&shutdown_waitq);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002025 dasd_put_device(device);
2026}
2027
2028/*
2029 * Schedules a call to dasd_tasklet over the device tasklet.
2030 */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002031void dasd_schedule_device_bh(struct dasd_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002032{
2033 /* Protect against rescheduling. */
Martin Schwidefsky973bd992006-01-06 00:19:07 -08002034 if (atomic_cmpxchg (&device->tasklet_scheduled, 0, 1) != 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002035 return;
2036 dasd_get_device(device);
2037 tasklet_hi_schedule(&device->tasklet);
2038}
2039
Stefan Weinhubereb6e1992009-12-07 12:51:51 +01002040void dasd_device_set_stop_bits(struct dasd_device *device, int bits)
2041{
2042 device->stopped |= bits;
2043}
2044EXPORT_SYMBOL_GPL(dasd_device_set_stop_bits);
2045
2046void dasd_device_remove_stop_bits(struct dasd_device *device, int bits)
2047{
2048 device->stopped &= ~bits;
2049 if (!device->stopped)
2050 wake_up(&generic_waitq);
2051}
2052EXPORT_SYMBOL_GPL(dasd_device_remove_stop_bits);
2053
Linus Torvalds1da177e2005-04-16 15:20:36 -07002054/*
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002055 * Queue a request to the head of the device ccw_queue.
2056 * Start the I/O if possible.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002057 */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002058void dasd_add_request_head(struct dasd_ccw_req *cqr)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002059{
2060 struct dasd_device *device;
2061 unsigned long flags;
2062
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002063 device = cqr->startdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002064 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002065 cqr->status = DASD_CQR_QUEUED;
2066 list_add(&cqr->devlist, &device->ccw_queue);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002067 /* let the bh start the request to keep them in order */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002068 dasd_schedule_device_bh(device);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002069 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
2070}
2071
2072/*
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002073 * Queue a request to the tail of the device ccw_queue.
2074 * Start the I/O if possible.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002075 */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002076void dasd_add_request_tail(struct dasd_ccw_req *cqr)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002077{
2078 struct dasd_device *device;
2079 unsigned long flags;
2080
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002081 device = cqr->startdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002082 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002083 cqr->status = DASD_CQR_QUEUED;
2084 list_add_tail(&cqr->devlist, &device->ccw_queue);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002085 /* let the bh start the request to keep them in order */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002086 dasd_schedule_device_bh(device);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002087 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
2088}
2089
2090/*
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002091 * Wakeup helper for the 'sleep_on' functions.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002092 */
Stefan Haberland5915a872011-10-30 15:16:57 +01002093void dasd_wakeup_cb(struct dasd_ccw_req *cqr, void *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002094{
Stefan Weinhuber1c1e0932010-05-12 09:32:11 +02002095 spin_lock_irq(get_ccwdev_lock(cqr->startdev->cdev));
2096 cqr->callback_data = DASD_SLEEPON_END_TAG;
2097 spin_unlock_irq(get_ccwdev_lock(cqr->startdev->cdev));
2098 wake_up(&generic_waitq);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002099}
Stefan Haberland5915a872011-10-30 15:16:57 +01002100EXPORT_SYMBOL_GPL(dasd_wakeup_cb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002101
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002102static inline int _wait_for_wakeup(struct dasd_ccw_req *cqr)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002103{
2104 struct dasd_device *device;
2105 int rc;
2106
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002107 device = cqr->startdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002108 spin_lock_irq(get_ccwdev_lock(device->cdev));
Stefan Weinhuber1c1e0932010-05-12 09:32:11 +02002109 rc = (cqr->callback_data == DASD_SLEEPON_END_TAG);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002110 spin_unlock_irq(get_ccwdev_lock(device->cdev));
2111 return rc;
2112}
2113
2114/*
Stefan Weinhubereb6e1992009-12-07 12:51:51 +01002115 * checks if error recovery is necessary, returns 1 if yes, 0 otherwise.
2116 */
2117static int __dasd_sleep_on_erp(struct dasd_ccw_req *cqr)
2118{
2119 struct dasd_device *device;
2120 dasd_erp_fn_t erp_fn;
2121
2122 if (cqr->status == DASD_CQR_FILLED)
2123 return 0;
2124 device = cqr->startdev;
2125 if (test_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags)) {
2126 if (cqr->status == DASD_CQR_TERMINATED) {
2127 device->discipline->handle_terminated_request(cqr);
2128 return 1;
2129 }
2130 if (cqr->status == DASD_CQR_NEED_ERP) {
2131 erp_fn = device->discipline->erp_action(cqr);
2132 erp_fn(cqr);
2133 return 1;
2134 }
2135 if (cqr->status == DASD_CQR_FAILED)
2136 dasd_log_sense(cqr, &cqr->irb);
2137 if (cqr->refers) {
2138 __dasd_process_erp(device, cqr);
2139 return 1;
2140 }
2141 }
2142 return 0;
2143}
2144
2145static int __dasd_sleep_on_loop_condition(struct dasd_ccw_req *cqr)
2146{
2147 if (test_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags)) {
2148 if (cqr->refers) /* erp is not done yet */
2149 return 1;
2150 return ((cqr->status != DASD_CQR_DONE) &&
2151 (cqr->status != DASD_CQR_FAILED));
2152 } else
2153 return (cqr->status == DASD_CQR_FILLED);
2154}
2155
2156static int _dasd_sleep_on(struct dasd_ccw_req *maincqr, int interruptible)
2157{
2158 struct dasd_device *device;
2159 int rc;
2160 struct list_head ccw_queue;
2161 struct dasd_ccw_req *cqr;
2162
2163 INIT_LIST_HEAD(&ccw_queue);
2164 maincqr->status = DASD_CQR_FILLED;
2165 device = maincqr->startdev;
2166 list_add(&maincqr->blocklist, &ccw_queue);
2167 for (cqr = maincqr; __dasd_sleep_on_loop_condition(cqr);
2168 cqr = list_first_entry(&ccw_queue,
2169 struct dasd_ccw_req, blocklist)) {
2170
2171 if (__dasd_sleep_on_erp(cqr))
2172 continue;
2173 if (cqr->status != DASD_CQR_FILLED) /* could be failed */
2174 continue;
Stefan Weinhuber5a27e602011-01-05 12:48:04 +01002175 if (test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags) &&
2176 !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) {
2177 cqr->status = DASD_CQR_FAILED;
2178 cqr->intrc = -EPERM;
2179 continue;
2180 }
Stefan Weinhubereb6e1992009-12-07 12:51:51 +01002181 /* Non-temporary stop condition will trigger fail fast */
2182 if (device->stopped & ~DASD_STOPPED_PENDING &&
2183 test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags) &&
2184 (!dasd_eer_enabled(device))) {
2185 cqr->status = DASD_CQR_FAILED;
Hannes Reinecked1ffc1f2013-01-30 09:26:16 +00002186 cqr->intrc = -ENOLINK;
Stefan Weinhubereb6e1992009-12-07 12:51:51 +01002187 continue;
2188 }
Stefan Weinhubereb6e1992009-12-07 12:51:51 +01002189 /* Don't try to start requests if device is stopped */
2190 if (interruptible) {
2191 rc = wait_event_interruptible(
2192 generic_waitq, !(device->stopped));
2193 if (rc == -ERESTARTSYS) {
2194 cqr->status = DASD_CQR_FAILED;
2195 maincqr->intrc = rc;
2196 continue;
2197 }
2198 } else
2199 wait_event(generic_waitq, !(device->stopped));
2200
Stefan Haberland5915a872011-10-30 15:16:57 +01002201 if (!cqr->callback)
2202 cqr->callback = dasd_wakeup_cb;
2203
Stefan Weinhuber1c1e0932010-05-12 09:32:11 +02002204 cqr->callback_data = DASD_SLEEPON_START_TAG;
Stefan Weinhubereb6e1992009-12-07 12:51:51 +01002205 dasd_add_request_tail(cqr);
2206 if (interruptible) {
2207 rc = wait_event_interruptible(
2208 generic_waitq, _wait_for_wakeup(cqr));
2209 if (rc == -ERESTARTSYS) {
2210 dasd_cancel_req(cqr);
2211 /* wait (non-interruptible) for final status */
2212 wait_event(generic_waitq,
2213 _wait_for_wakeup(cqr));
2214 cqr->status = DASD_CQR_FAILED;
2215 maincqr->intrc = rc;
2216 continue;
2217 }
2218 } else
2219 wait_event(generic_waitq, _wait_for_wakeup(cqr));
2220 }
2221
Heiko Carstens1aae0562013-01-30 09:49:40 +01002222 maincqr->endclk = get_tod_clock();
Stefan Weinhubereb6e1992009-12-07 12:51:51 +01002223 if ((maincqr->status != DASD_CQR_DONE) &&
2224 (maincqr->intrc != -ERESTARTSYS))
2225 dasd_log_sense(maincqr, &maincqr->irb);
2226 if (maincqr->status == DASD_CQR_DONE)
2227 rc = 0;
2228 else if (maincqr->intrc)
2229 rc = maincqr->intrc;
2230 else
2231 rc = -EIO;
2232 return rc;
2233}
2234
Stefan Haberlandd42e1712013-04-15 16:22:23 +02002235static inline int _wait_for_wakeup_queue(struct list_head *ccw_queue)
2236{
2237 struct dasd_ccw_req *cqr;
2238
2239 list_for_each_entry(cqr, ccw_queue, blocklist) {
2240 if (cqr->callback_data != DASD_SLEEPON_END_TAG)
2241 return 0;
2242 }
2243
2244 return 1;
2245}
2246
2247static int _dasd_sleep_on_queue(struct list_head *ccw_queue, int interruptible)
2248{
2249 struct dasd_device *device;
2250 int rc;
2251 struct dasd_ccw_req *cqr, *n;
2252
2253retry:
2254 list_for_each_entry_safe(cqr, n, ccw_queue, blocklist) {
2255 device = cqr->startdev;
2256 if (cqr->status != DASD_CQR_FILLED) /*could be failed*/
2257 continue;
2258
2259 if (test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags) &&
2260 !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) {
2261 cqr->status = DASD_CQR_FAILED;
2262 cqr->intrc = -EPERM;
2263 continue;
2264 }
2265 /*Non-temporary stop condition will trigger fail fast*/
2266 if (device->stopped & ~DASD_STOPPED_PENDING &&
2267 test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags) &&
2268 !dasd_eer_enabled(device)) {
2269 cqr->status = DASD_CQR_FAILED;
2270 cqr->intrc = -EAGAIN;
2271 continue;
2272 }
2273
2274 /*Don't try to start requests if device is stopped*/
2275 if (interruptible) {
2276 rc = wait_event_interruptible(
2277 generic_waitq, !device->stopped);
2278 if (rc == -ERESTARTSYS) {
2279 cqr->status = DASD_CQR_FAILED;
2280 cqr->intrc = rc;
2281 continue;
2282 }
2283 } else
2284 wait_event(generic_waitq, !(device->stopped));
2285
2286 if (!cqr->callback)
2287 cqr->callback = dasd_wakeup_cb;
2288 cqr->callback_data = DASD_SLEEPON_START_TAG;
2289 dasd_add_request_tail(cqr);
2290 }
2291
2292 wait_event(generic_waitq, _wait_for_wakeup_queue(ccw_queue));
2293
2294 rc = 0;
2295 list_for_each_entry_safe(cqr, n, ccw_queue, blocklist) {
2296 if (__dasd_sleep_on_erp(cqr))
2297 rc = 1;
2298 }
2299 if (rc)
2300 goto retry;
2301
2302
2303 return 0;
2304}
2305
Stefan Weinhubereb6e1992009-12-07 12:51:51 +01002306/*
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002307 * Queue a request to the tail of the device ccw_queue and wait for
2308 * it's completion.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002309 */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002310int dasd_sleep_on(struct dasd_ccw_req *cqr)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002311{
Stefan Weinhubereb6e1992009-12-07 12:51:51 +01002312 return _dasd_sleep_on(cqr, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002313}
2314
2315/*
Stefan Haberlandd42e1712013-04-15 16:22:23 +02002316 * Start requests from a ccw_queue and wait for their completion.
2317 */
2318int dasd_sleep_on_queue(struct list_head *ccw_queue)
2319{
2320 return _dasd_sleep_on_queue(ccw_queue, 0);
2321}
2322EXPORT_SYMBOL(dasd_sleep_on_queue);
2323
2324/*
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002325 * Queue a request to the tail of the device ccw_queue and wait
2326 * interruptible for it's completion.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002327 */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002328int dasd_sleep_on_interruptible(struct dasd_ccw_req *cqr)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002329{
Stefan Weinhubereb6e1992009-12-07 12:51:51 +01002330 return _dasd_sleep_on(cqr, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002331}
2332
2333/*
2334 * Whoa nelly now it gets really hairy. For some functions (e.g. steal lock
2335 * for eckd devices) the currently running request has to be terminated
2336 * and be put back to status queued, before the special request is added
2337 * to the head of the queue. Then the special request is waited on normally.
2338 */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002339static inline int _dasd_term_running_cqr(struct dasd_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002340{
2341 struct dasd_ccw_req *cqr;
Stefan Haberlandaade6c02011-05-10 17:13:38 +02002342 int rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002343
2344 if (list_empty(&device->ccw_queue))
2345 return 0;
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002346 cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist);
Stefan Haberlandaade6c02011-05-10 17:13:38 +02002347 rc = device->discipline->term_IO(cqr);
2348 if (!rc)
2349 /*
2350 * CQR terminated because a more important request is pending.
2351 * Undo decreasing of retry counter because this is
2352 * not an error case.
2353 */
2354 cqr->retries++;
2355 return rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002356}
2357
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002358int dasd_sleep_on_immediatly(struct dasd_ccw_req *cqr)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002359{
Linus Torvalds1da177e2005-04-16 15:20:36 -07002360 struct dasd_device *device;
2361 int rc;
Horst Hummel138c0142006-06-29 14:58:12 +02002362
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002363 device = cqr->startdev;
Stefan Weinhuber5a27e602011-01-05 12:48:04 +01002364 if (test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags) &&
2365 !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) {
2366 cqr->status = DASD_CQR_FAILED;
2367 cqr->intrc = -EPERM;
2368 return -EIO;
2369 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002370 spin_lock_irq(get_ccwdev_lock(device->cdev));
2371 rc = _dasd_term_running_cqr(device);
2372 if (rc) {
2373 spin_unlock_irq(get_ccwdev_lock(device->cdev));
2374 return rc;
2375 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002376 cqr->callback = dasd_wakeup_cb;
Stefan Weinhuber1c1e0932010-05-12 09:32:11 +02002377 cqr->callback_data = DASD_SLEEPON_START_TAG;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002378 cqr->status = DASD_CQR_QUEUED;
Stefan Haberland214b8ff2011-10-30 15:16:56 +01002379 /*
2380 * add new request as second
2381 * first the terminated cqr needs to be finished
2382 */
2383 list_add(&cqr->devlist, device->ccw_queue.next);
Horst Hummel138c0142006-06-29 14:58:12 +02002384
Linus Torvalds1da177e2005-04-16 15:20:36 -07002385 /* let the bh start the request to keep them in order */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002386 dasd_schedule_device_bh(device);
Horst Hummel138c0142006-06-29 14:58:12 +02002387
Linus Torvalds1da177e2005-04-16 15:20:36 -07002388 spin_unlock_irq(get_ccwdev_lock(device->cdev));
2389
Stefan Haberlandc80ee722008-05-30 10:03:31 +02002390 wait_event(generic_waitq, _wait_for_wakeup(cqr));
Horst Hummel138c0142006-06-29 14:58:12 +02002391
Stefan Weinhuber6cc7f162009-06-12 10:26:39 +02002392 if (cqr->status == DASD_CQR_DONE)
2393 rc = 0;
2394 else if (cqr->intrc)
2395 rc = cqr->intrc;
2396 else
2397 rc = -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002398 return rc;
2399}
2400
2401/*
2402 * Cancels a request that was started with dasd_sleep_on_req.
2403 * This is useful to timeout requests. The request will be
2404 * terminated if it is currently in i/o.
Hannes Reineckeb99a9462013-01-30 09:26:11 +00002405 * Returns 0 if request termination was successful
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002406 * negative error code if termination failed
2407 * Cancellation of a request is an asynchronous operation! The calling
2408 * function has to wait until the request is properly returned via callback.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002409 */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002410int dasd_cancel_req(struct dasd_ccw_req *cqr)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002411{
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002412 struct dasd_device *device = cqr->startdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002413 unsigned long flags;
2414 int rc;
2415
2416 rc = 0;
2417 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
2418 switch (cqr->status) {
2419 case DASD_CQR_QUEUED:
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002420 /* request was not started - just set to cleared */
2421 cqr->status = DASD_CQR_CLEARED;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002422 break;
2423 case DASD_CQR_IN_IO:
2424 /* request in IO - terminate IO and release again */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002425 rc = device->discipline->term_IO(cqr);
2426 if (rc) {
Stefan Haberlandfc19f382009-03-26 15:23:49 +01002427 dev_err(&device->cdev->dev,
2428 "Cancelling request %p failed with rc=%d\n",
2429 cqr, rc);
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002430 } else {
Heiko Carstens1aae0562013-01-30 09:49:40 +01002431 cqr->stopclk = get_tod_clock();
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002432 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002433 break;
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002434 default: /* already finished or clear pending - do nothing */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002435 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002436 }
2437 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002438 dasd_schedule_device_bh(device);
2439 return rc;
2440}
2441
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002442/*
2443 * SECTION: Operations of the dasd_block layer.
2444 */
2445
2446/*
2447 * Timeout function for dasd_block. This is used when the block layer
2448 * is waiting for something that may not come reliably, (e.g. a state
2449 * change interrupt)
2450 */
2451static void dasd_block_timeout(unsigned long ptr)
2452{
2453 unsigned long flags;
2454 struct dasd_block *block;
2455
2456 block = (struct dasd_block *) ptr;
2457 spin_lock_irqsave(get_ccwdev_lock(block->base->cdev), flags);
2458 /* re-activate request queue */
Stefan Weinhubereb6e1992009-12-07 12:51:51 +01002459 dasd_device_remove_stop_bits(block->base, DASD_STOPPED_PENDING);
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002460 spin_unlock_irqrestore(get_ccwdev_lock(block->base->cdev), flags);
2461 dasd_schedule_block_bh(block);
2462}
2463
2464/*
2465 * Setup timeout for a dasd_block in jiffies.
2466 */
2467void dasd_block_set_timer(struct dasd_block *block, int expires)
2468{
Stefan Weinhuber48cae882009-02-11 10:37:31 +01002469 if (expires == 0)
2470 del_timer(&block->timer);
2471 else
2472 mod_timer(&block->timer, jiffies + expires);
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002473}
2474
2475/*
2476 * Clear timeout for a dasd_block.
2477 */
2478void dasd_block_clear_timer(struct dasd_block *block)
2479{
Stefan Weinhuber48cae882009-02-11 10:37:31 +01002480 del_timer(&block->timer);
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002481}
2482
2483/*
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002484 * Process finished error recovery ccw.
2485 */
Stefan Weinhubereb6e1992009-12-07 12:51:51 +01002486static void __dasd_process_erp(struct dasd_device *device,
2487 struct dasd_ccw_req *cqr)
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002488{
2489 dasd_erp_fn_t erp_fn;
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002490
2491 if (cqr->status == DASD_CQR_DONE)
2492 DBF_DEV_EVENT(DBF_NOTICE, device, "%s", "ERP successful");
2493 else
Stefan Haberlandfc19f382009-03-26 15:23:49 +01002494 dev_err(&device->cdev->dev, "ERP failed for the DASD\n");
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002495 erp_fn = device->discipline->erp_postaction(cqr);
2496 erp_fn(cqr);
2497}
2498
2499/*
2500 * Fetch requests from the block device queue.
2501 */
2502static void __dasd_process_request_queue(struct dasd_block *block)
2503{
2504 struct request_queue *queue;
2505 struct request *req;
2506 struct dasd_ccw_req *cqr;
2507 struct dasd_device *basedev;
2508 unsigned long flags;
2509 queue = block->request_queue;
2510 basedev = block->base;
2511 /* No queue ? Then there is nothing to do. */
2512 if (queue == NULL)
2513 return;
2514
2515 /*
2516 * We requeue request from the block device queue to the ccw
2517 * queue only in two states. In state DASD_STATE_READY the
2518 * partition detection is done and we need to requeue requests
2519 * for that. State DASD_STATE_ONLINE is normal block device
2520 * operation.
2521 */
Stefan Weinhuber97f604b2009-09-11 10:28:28 +02002522 if (basedev->state < DASD_STATE_READY) {
2523 while ((req = blk_fetch_request(block->request_queue)))
2524 __blk_end_request_all(req, -EIO);
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002525 return;
Stefan Weinhuber97f604b2009-09-11 10:28:28 +02002526 }
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002527 /* Now we try to fetch requests from the request queue */
Jens Axboe7eaceac2011-03-10 08:52:07 +01002528 while ((req = blk_peek_request(queue))) {
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002529 if (basedev->features & DASD_FEATURE_READONLY &&
2530 rq_data_dir(req) == WRITE) {
2531 DBF_DEV_EVENT(DBF_ERR, basedev,
2532 "Rejecting write request %p",
2533 req);
Tejun Heo9934c8c2009-05-08 11:54:16 +09002534 blk_start_request(req);
Tejun Heo40cbbb72009-04-23 11:05:19 +09002535 __blk_end_request_all(req, -EIO);
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002536 continue;
2537 }
2538 cqr = basedev->discipline->build_cp(basedev, block, req);
2539 if (IS_ERR(cqr)) {
2540 if (PTR_ERR(cqr) == -EBUSY)
2541 break; /* normal end condition */
2542 if (PTR_ERR(cqr) == -ENOMEM)
2543 break; /* terminate request queue loop */
2544 if (PTR_ERR(cqr) == -EAGAIN) {
2545 /*
2546 * The current request cannot be build right
2547 * now, we have to try later. If this request
2548 * is the head-of-queue we stop the device
2549 * for 1/2 second.
2550 */
2551 if (!list_empty(&block->ccw_queue))
2552 break;
Stefan Weinhubereb6e1992009-12-07 12:51:51 +01002553 spin_lock_irqsave(
2554 get_ccwdev_lock(basedev->cdev), flags);
2555 dasd_device_set_stop_bits(basedev,
2556 DASD_STOPPED_PENDING);
2557 spin_unlock_irqrestore(
2558 get_ccwdev_lock(basedev->cdev), flags);
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002559 dasd_block_set_timer(block, HZ/2);
2560 break;
2561 }
2562 DBF_DEV_EVENT(DBF_ERR, basedev,
2563 "CCW creation failed (rc=%ld) "
2564 "on request %p",
2565 PTR_ERR(cqr), req);
Tejun Heo9934c8c2009-05-08 11:54:16 +09002566 blk_start_request(req);
Tejun Heo40cbbb72009-04-23 11:05:19 +09002567 __blk_end_request_all(req, -EIO);
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002568 continue;
2569 }
2570 /*
2571 * Note: callback is set to dasd_return_cqr_cb in
2572 * __dasd_block_start_head to cover erp requests as well
2573 */
2574 cqr->callback_data = (void *) req;
2575 cqr->status = DASD_CQR_FILLED;
Hannes Reineckea2ace462013-01-30 09:26:14 +00002576 req->completion_data = cqr;
Tejun Heo9934c8c2009-05-08 11:54:16 +09002577 blk_start_request(req);
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002578 list_add_tail(&cqr->blocklist, &block->ccw_queue);
Hannes Reineckea2ace462013-01-30 09:26:14 +00002579 INIT_LIST_HEAD(&cqr->devlist);
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002580 dasd_profile_start(block, cqr, req);
2581 }
2582}
2583
2584static void __dasd_cleanup_cqr(struct dasd_ccw_req *cqr)
2585{
2586 struct request *req;
2587 int status;
Kiyoshi Ueda4c4e2142008-01-28 10:29:42 +01002588 int error = 0;
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002589
2590 req = (struct request *) cqr->callback_data;
2591 dasd_profile_end(cqr->block, cqr, req);
Stefan Weinhuberfe6b8e72008-02-05 16:50:47 +01002592 status = cqr->block->base->discipline->free_cp(cqr, req);
Hannes Reinecked1ffc1f2013-01-30 09:26:16 +00002593 if (status < 0)
2594 error = status;
2595 else if (status == 0) {
2596 if (cqr->intrc == -EPERM)
2597 error = -EBADE;
2598 else if (cqr->intrc == -ENOLINK ||
2599 cqr->intrc == -ETIMEDOUT)
2600 error = cqr->intrc;
2601 else
2602 error = -EIO;
2603 }
Tejun Heo40cbbb72009-04-23 11:05:19 +09002604 __blk_end_request_all(req, error);
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002605}
2606
2607/*
2608 * Process ccw request queue.
2609 */
2610static void __dasd_process_block_ccw_queue(struct dasd_block *block,
2611 struct list_head *final_queue)
2612{
2613 struct list_head *l, *n;
2614 struct dasd_ccw_req *cqr;
2615 dasd_erp_fn_t erp_fn;
2616 unsigned long flags;
2617 struct dasd_device *base = block->base;
2618
2619restart:
2620 /* Process request with final status. */
2621 list_for_each_safe(l, n, &block->ccw_queue) {
2622 cqr = list_entry(l, struct dasd_ccw_req, blocklist);
2623 if (cqr->status != DASD_CQR_DONE &&
2624 cqr->status != DASD_CQR_FAILED &&
2625 cqr->status != DASD_CQR_NEED_ERP &&
2626 cqr->status != DASD_CQR_TERMINATED)
2627 continue;
2628
2629 if (cqr->status == DASD_CQR_TERMINATED) {
2630 base->discipline->handle_terminated_request(cqr);
2631 goto restart;
2632 }
2633
2634 /* Process requests that may be recovered */
2635 if (cqr->status == DASD_CQR_NEED_ERP) {
Stefan Haberland6c5f57c2008-02-05 16:50:46 +01002636 erp_fn = base->discipline->erp_action(cqr);
Stefan Haberland6a5176c2010-04-22 17:17:02 +02002637 if (IS_ERR(erp_fn(cqr)))
2638 continue;
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002639 goto restart;
2640 }
2641
Stefan Haberlanda9cffb22008-11-14 18:18:08 +01002642 /* log sense for fatal error */
2643 if (cqr->status == DASD_CQR_FAILED) {
2644 dasd_log_sense(cqr, &cqr->irb);
2645 }
2646
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002647 /* First of all call extended error reporting. */
2648 if (dasd_eer_enabled(base) &&
2649 cqr->status == DASD_CQR_FAILED) {
2650 dasd_eer_write(base, cqr, DASD_EER_FATALERROR);
2651
2652 /* restart request */
2653 cqr->status = DASD_CQR_FILLED;
2654 cqr->retries = 255;
2655 spin_lock_irqsave(get_ccwdev_lock(base->cdev), flags);
Stefan Weinhubereb6e1992009-12-07 12:51:51 +01002656 dasd_device_set_stop_bits(base, DASD_STOPPED_QUIESCE);
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002657 spin_unlock_irqrestore(get_ccwdev_lock(base->cdev),
2658 flags);
2659 goto restart;
2660 }
2661
2662 /* Process finished ERP request. */
2663 if (cqr->refers) {
Stefan Weinhubereb6e1992009-12-07 12:51:51 +01002664 __dasd_process_erp(base, cqr);
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002665 goto restart;
2666 }
2667
2668 /* Rechain finished requests to final queue */
Heiko Carstens1aae0562013-01-30 09:49:40 +01002669 cqr->endclk = get_tod_clock();
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002670 list_move_tail(&cqr->blocklist, final_queue);
2671 }
2672}
2673
2674static void dasd_return_cqr_cb(struct dasd_ccw_req *cqr, void *data)
2675{
2676 dasd_schedule_block_bh(cqr->block);
2677}
2678
2679static void __dasd_block_start_head(struct dasd_block *block)
2680{
2681 struct dasd_ccw_req *cqr;
2682
2683 if (list_empty(&block->ccw_queue))
2684 return;
2685 /* We allways begin with the first requests on the queue, as some
2686 * of previously started requests have to be enqueued on a
2687 * dasd_device again for error recovery.
2688 */
2689 list_for_each_entry(cqr, &block->ccw_queue, blocklist) {
2690 if (cqr->status != DASD_CQR_FILLED)
2691 continue;
Stefan Weinhuber5a27e602011-01-05 12:48:04 +01002692 if (test_bit(DASD_FLAG_LOCK_STOLEN, &block->base->flags) &&
2693 !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) {
2694 cqr->status = DASD_CQR_FAILED;
2695 cqr->intrc = -EPERM;
2696 dasd_schedule_block_bh(block);
2697 continue;
2698 }
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002699 /* Non-temporary stop condition will trigger fail fast */
2700 if (block->base->stopped & ~DASD_STOPPED_PENDING &&
2701 test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags) &&
2702 (!dasd_eer_enabled(block->base))) {
2703 cqr->status = DASD_CQR_FAILED;
Hannes Reinecked1ffc1f2013-01-30 09:26:16 +00002704 cqr->intrc = -ENOLINK;
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002705 dasd_schedule_block_bh(block);
2706 continue;
2707 }
2708 /* Don't try to start requests if device is stopped */
2709 if (block->base->stopped)
2710 return;
2711
2712 /* just a fail safe check, should not happen */
2713 if (!cqr->startdev)
2714 cqr->startdev = block->base;
2715
2716 /* make sure that the requests we submit find their way back */
2717 cqr->callback = dasd_return_cqr_cb;
2718
2719 dasd_add_request_tail(cqr);
2720 }
2721}
2722
2723/*
2724 * Central dasd_block layer routine. Takes requests from the generic
2725 * block layer request queue, creates ccw requests, enqueues them on
2726 * a dasd_device and processes ccw requests that have been returned.
2727 */
2728static void dasd_block_tasklet(struct dasd_block *block)
2729{
2730 struct list_head final_queue;
2731 struct list_head *l, *n;
2732 struct dasd_ccw_req *cqr;
2733
2734 atomic_set(&block->tasklet_scheduled, 0);
2735 INIT_LIST_HEAD(&final_queue);
2736 spin_lock(&block->queue_lock);
2737 /* Finish off requests on ccw queue */
2738 __dasd_process_block_ccw_queue(block, &final_queue);
2739 spin_unlock(&block->queue_lock);
2740 /* Now call the callback function of requests with final status */
2741 spin_lock_irq(&block->request_queue_lock);
2742 list_for_each_safe(l, n, &final_queue) {
2743 cqr = list_entry(l, struct dasd_ccw_req, blocklist);
2744 list_del_init(&cqr->blocklist);
2745 __dasd_cleanup_cqr(cqr);
2746 }
2747 spin_lock(&block->queue_lock);
2748 /* Get new request from the block device request queue */
2749 __dasd_process_request_queue(block);
2750 /* Now check if the head of the ccw queue needs to be started. */
2751 __dasd_block_start_head(block);
2752 spin_unlock(&block->queue_lock);
2753 spin_unlock_irq(&block->request_queue_lock);
Stefan Haberland4679e892012-06-19 17:30:12 +02002754 if (waitqueue_active(&shutdown_waitq))
2755 wake_up(&shutdown_waitq);
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002756 dasd_put_device(block->base);
2757}
2758
2759static void _dasd_wake_block_flush_cb(struct dasd_ccw_req *cqr, void *data)
2760{
2761 wake_up(&dasd_flush_wq);
2762}
2763
2764/*
Stefan Haberlandc5576872013-04-15 16:41:31 +02002765 * Requeue a request back to the block request queue
2766 * only works for block requests
2767 */
2768static int _dasd_requeue_request(struct dasd_ccw_req *cqr)
2769{
2770 struct dasd_block *block = cqr->block;
2771 struct request *req;
2772 unsigned long flags;
2773
2774 if (!block)
2775 return -EINVAL;
2776 spin_lock_irqsave(&block->queue_lock, flags);
2777 req = (struct request *) cqr->callback_data;
2778 blk_requeue_request(block->request_queue, req);
2779 spin_unlock_irqrestore(&block->queue_lock, flags);
2780
2781 return 0;
2782}
2783
2784/*
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002785 * Go through all request on the dasd_block request queue, cancel them
2786 * on the respective dasd_device, and return them to the generic
2787 * block layer.
2788 */
2789static int dasd_flush_block_queue(struct dasd_block *block)
2790{
2791 struct dasd_ccw_req *cqr, *n;
2792 int rc, i;
2793 struct list_head flush_queue;
2794
2795 INIT_LIST_HEAD(&flush_queue);
2796 spin_lock_bh(&block->queue_lock);
2797 rc = 0;
2798restart:
2799 list_for_each_entry_safe(cqr, n, &block->ccw_queue, blocklist) {
2800 /* if this request currently owned by a dasd_device cancel it */
2801 if (cqr->status >= DASD_CQR_QUEUED)
2802 rc = dasd_cancel_req(cqr);
2803 if (rc < 0)
2804 break;
2805 /* Rechain request (including erp chain) so it won't be
2806 * touched by the dasd_block_tasklet anymore.
2807 * Replace the callback so we notice when the request
2808 * is returned from the dasd_device layer.
2809 */
2810 cqr->callback = _dasd_wake_block_flush_cb;
2811 for (i = 0; cqr != NULL; cqr = cqr->refers, i++)
2812 list_move_tail(&cqr->blocklist, &flush_queue);
2813 if (i > 1)
2814 /* moved more than one request - need to restart */
2815 goto restart;
2816 }
2817 spin_unlock_bh(&block->queue_lock);
2818 /* Now call the callback function of flushed requests */
2819restart_cb:
2820 list_for_each_entry_safe(cqr, n, &flush_queue, blocklist) {
2821 wait_event(dasd_flush_wq, (cqr->status < DASD_CQR_QUEUED));
2822 /* Process finished ERP request. */
2823 if (cqr->refers) {
Stefan Haberland0cd4bd42008-12-25 13:38:54 +01002824 spin_lock_bh(&block->queue_lock);
Stefan Weinhubereb6e1992009-12-07 12:51:51 +01002825 __dasd_process_erp(block->base, cqr);
Stefan Haberland0cd4bd42008-12-25 13:38:54 +01002826 spin_unlock_bh(&block->queue_lock);
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002827 /* restart list_for_xx loop since dasd_process_erp
2828 * might remove multiple elements */
2829 goto restart_cb;
2830 }
2831 /* call the callback function */
Stefan Haberland0cd4bd42008-12-25 13:38:54 +01002832 spin_lock_irq(&block->request_queue_lock);
Heiko Carstens1aae0562013-01-30 09:49:40 +01002833 cqr->endclk = get_tod_clock();
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002834 list_del_init(&cqr->blocklist);
2835 __dasd_cleanup_cqr(cqr);
Stefan Haberland0cd4bd42008-12-25 13:38:54 +01002836 spin_unlock_irq(&block->request_queue_lock);
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002837 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002838 return rc;
2839}
2840
2841/*
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002842 * Schedules a call to dasd_tasklet over the device tasklet.
2843 */
2844void dasd_schedule_block_bh(struct dasd_block *block)
2845{
2846 /* Protect against rescheduling. */
2847 if (atomic_cmpxchg(&block->tasklet_scheduled, 0, 1) != 0)
2848 return;
2849 /* life cycle of block is bound to it's base device */
2850 dasd_get_device(block->base);
2851 tasklet_hi_schedule(&block->tasklet);
2852}
2853
2854
2855/*
2856 * SECTION: external block device operations
2857 * (request queue handling, open, release, etc.)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002858 */
2859
2860/*
2861 * Dasd request queue function. Called from ll_rw_blk.c
2862 */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002863static void do_dasd_request(struct request_queue *queue)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002864{
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002865 struct dasd_block *block;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002866
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002867 block = queue->queuedata;
2868 spin_lock(&block->queue_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002869 /* Get new request from the block device request queue */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002870 __dasd_process_request_queue(block);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002871 /* Now check if the head of the ccw queue needs to be started. */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002872 __dasd_block_start_head(block);
2873 spin_unlock(&block->queue_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002874}
2875
2876/*
Hannes Reineckea2ace462013-01-30 09:26:14 +00002877 * Block timeout callback, called from the block layer
2878 *
2879 * request_queue lock is held on entry.
2880 *
2881 * Return values:
2882 * BLK_EH_RESET_TIMER if the request should be left running
2883 * BLK_EH_NOT_HANDLED if the request is handled or terminated
2884 * by the driver.
2885 */
2886enum blk_eh_timer_return dasd_times_out(struct request *req)
2887{
2888 struct dasd_ccw_req *cqr = req->completion_data;
2889 struct dasd_block *block = req->q->queuedata;
2890 struct dasd_device *device;
2891 int rc = 0;
2892
2893 if (!cqr)
2894 return BLK_EH_NOT_HANDLED;
2895
2896 device = cqr->startdev ? cqr->startdev : block->base;
Hannes Reinecke3d71ad32013-01-30 09:26:18 +00002897 if (!device->blk_timeout)
2898 return BLK_EH_RESET_TIMER;
Hannes Reineckea2ace462013-01-30 09:26:14 +00002899 DBF_DEV_EVENT(DBF_WARNING, device,
2900 " dasd_times_out cqr %p status %x",
2901 cqr, cqr->status);
2902
2903 spin_lock(&block->queue_lock);
2904 spin_lock(get_ccwdev_lock(device->cdev));
2905 cqr->retries = -1;
2906 cqr->intrc = -ETIMEDOUT;
2907 if (cqr->status >= DASD_CQR_QUEUED) {
2908 spin_unlock(get_ccwdev_lock(device->cdev));
2909 rc = dasd_cancel_req(cqr);
2910 } else if (cqr->status == DASD_CQR_FILLED ||
2911 cqr->status == DASD_CQR_NEED_ERP) {
2912 cqr->status = DASD_CQR_TERMINATED;
2913 spin_unlock(get_ccwdev_lock(device->cdev));
2914 } else if (cqr->status == DASD_CQR_IN_ERP) {
2915 struct dasd_ccw_req *searchcqr, *nextcqr, *tmpcqr;
2916
2917 list_for_each_entry_safe(searchcqr, nextcqr,
2918 &block->ccw_queue, blocklist) {
2919 tmpcqr = searchcqr;
2920 while (tmpcqr->refers)
2921 tmpcqr = tmpcqr->refers;
2922 if (tmpcqr != cqr)
2923 continue;
2924 /* searchcqr is an ERP request for cqr */
2925 searchcqr->retries = -1;
2926 searchcqr->intrc = -ETIMEDOUT;
2927 if (searchcqr->status >= DASD_CQR_QUEUED) {
2928 spin_unlock(get_ccwdev_lock(device->cdev));
2929 rc = dasd_cancel_req(searchcqr);
2930 spin_lock(get_ccwdev_lock(device->cdev));
2931 } else if ((searchcqr->status == DASD_CQR_FILLED) ||
2932 (searchcqr->status == DASD_CQR_NEED_ERP)) {
2933 searchcqr->status = DASD_CQR_TERMINATED;
2934 rc = 0;
2935 } else if (searchcqr->status == DASD_CQR_IN_ERP) {
2936 /*
2937 * Shouldn't happen; most recent ERP
2938 * request is at the front of queue
2939 */
2940 continue;
2941 }
2942 break;
2943 }
2944 spin_unlock(get_ccwdev_lock(device->cdev));
2945 }
2946 dasd_schedule_block_bh(block);
2947 spin_unlock(&block->queue_lock);
2948
2949 return rc ? BLK_EH_RESET_TIMER : BLK_EH_NOT_HANDLED;
2950}
2951
2952/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07002953 * Allocate and initialize request queue and default I/O scheduler.
2954 */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002955static int dasd_alloc_queue(struct dasd_block *block)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002956{
2957 int rc;
2958
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002959 block->request_queue = blk_init_queue(do_dasd_request,
2960 &block->request_queue_lock);
2961 if (block->request_queue == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002962 return -ENOMEM;
2963
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002964 block->request_queue->queuedata = block;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002965
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002966 elevator_exit(block->request_queue->elevator);
Josef 'Jeff' Sipek08a8a0c2008-04-17 07:45:56 +02002967 block->request_queue->elevator = NULL;
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002968 rc = elevator_init(block->request_queue, "deadline");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002969 if (rc) {
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002970 blk_cleanup_queue(block->request_queue);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002971 return rc;
2972 }
2973 return 0;
2974}
2975
2976/*
2977 * Allocate and initialize request queue.
2978 */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002979static void dasd_setup_queue(struct dasd_block *block)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002980{
2981 int max;
2982
Stefan Haberlande4dbb0f2011-01-05 12:48:06 +01002983 if (block->base->features & DASD_FEATURE_USERAW) {
2984 /*
2985 * the max_blocks value for raw_track access is 256
2986 * it is higher than the native ECKD value because we
2987 * only need one ccw per track
2988 * so the max_hw_sectors are
2989 * 2048 x 512B = 1024kB = 16 tracks
2990 */
2991 max = 2048;
2992 } else {
2993 max = block->base->discipline->max_blocks << block->s2b_shift;
2994 }
2995 blk_queue_logical_block_size(block->request_queue,
2996 block->bp_block);
Martin K. Petersen086fa5f2010-02-26 00:20:38 -05002997 blk_queue_max_hw_sectors(block->request_queue, max);
Martin K. Petersen8a783622010-02-26 00:20:39 -05002998 blk_queue_max_segments(block->request_queue, -1L);
Stefan Weinhuberf3eb5382009-03-26 15:23:48 +01002999 /* with page sized segments we can translate each segement into
3000 * one idaw/tidaw
3001 */
3002 blk_queue_max_segment_size(block->request_queue, PAGE_SIZE);
3003 blk_queue_segment_boundary(block->request_queue, PAGE_SIZE - 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003004}
3005
3006/*
3007 * Deactivate and free request queue.
3008 */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01003009static void dasd_free_queue(struct dasd_block *block)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003010{
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01003011 if (block->request_queue) {
3012 blk_cleanup_queue(block->request_queue);
3013 block->request_queue = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003014 }
3015}
3016
3017/*
3018 * Flush request on the request queue.
3019 */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01003020static void dasd_flush_request_queue(struct dasd_block *block)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003021{
3022 struct request *req;
3023
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01003024 if (!block->request_queue)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003025 return;
Horst Hummel138c0142006-06-29 14:58:12 +02003026
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01003027 spin_lock_irq(&block->request_queue_lock);
Tejun Heo9934c8c2009-05-08 11:54:16 +09003028 while ((req = blk_fetch_request(block->request_queue)))
Tejun Heo40cbbb72009-04-23 11:05:19 +09003029 __blk_end_request_all(req, -EIO);
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01003030 spin_unlock_irq(&block->request_queue_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003031}
3032
Al Viro57a7c0b2008-03-02 10:36:08 -05003033static int dasd_open(struct block_device *bdev, fmode_t mode)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003034{
Stefan Haberland9eb25122010-02-26 22:37:46 +01003035 struct dasd_device *base;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003036 int rc;
3037
Stefan Weinhuber65f8da42011-04-20 10:15:30 +02003038 base = dasd_device_from_gendisk(bdev->bd_disk);
3039 if (!base)
Stefan Haberland9eb25122010-02-26 22:37:46 +01003040 return -ENODEV;
3041
Stefan Weinhuber65f8da42011-04-20 10:15:30 +02003042 atomic_inc(&base->block->open_count);
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01003043 if (test_bit(DASD_FLAG_OFFLINE, &base->flags)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07003044 rc = -ENODEV;
3045 goto unlock;
3046 }
3047
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01003048 if (!try_module_get(base->discipline->owner)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07003049 rc = -EINVAL;
3050 goto unlock;
3051 }
3052
3053 if (dasd_probeonly) {
Stefan Haberlandfc19f382009-03-26 15:23:49 +01003054 dev_info(&base->cdev->dev,
3055 "Accessing the DASD failed because it is in "
3056 "probeonly mode\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07003057 rc = -EPERM;
3058 goto out;
3059 }
3060
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01003061 if (base->state <= DASD_STATE_BASIC) {
3062 DBF_DEV_EVENT(DBF_ERR, base, " %s",
Linus Torvalds1da177e2005-04-16 15:20:36 -07003063 " Cannot open unrecognized device");
3064 rc = -ENODEV;
3065 goto out;
3066 }
3067
Stefan Weinhuber33b62a32010-03-08 12:26:24 +01003068 if ((mode & FMODE_WRITE) &&
3069 (test_bit(DASD_FLAG_DEVICE_RO, &base->flags) ||
3070 (base->features & DASD_FEATURE_READONLY))) {
3071 rc = -EROFS;
3072 goto out;
3073 }
3074
Stefan Weinhuber65f8da42011-04-20 10:15:30 +02003075 dasd_put_device(base);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003076 return 0;
3077
3078out:
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01003079 module_put(base->discipline->owner);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003080unlock:
Stefan Weinhuber65f8da42011-04-20 10:15:30 +02003081 atomic_dec(&base->block->open_count);
3082 dasd_put_device(base);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003083 return rc;
3084}
3085
Al Virodb2a1442013-05-05 21:52:57 -04003086static void dasd_release(struct gendisk *disk, fmode_t mode)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003087{
Al Virodb2a1442013-05-05 21:52:57 -04003088 struct dasd_device *base = dasd_device_from_gendisk(disk);
3089 if (base) {
3090 atomic_dec(&base->block->open_count);
3091 module_put(base->discipline->owner);
3092 dasd_put_device(base);
3093 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003094}
3095
Christoph Hellwiga885c8c2006-01-08 01:02:50 -08003096/*
3097 * Return disk geometry.
3098 */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01003099static int dasd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
Christoph Hellwiga885c8c2006-01-08 01:02:50 -08003100{
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01003101 struct dasd_device *base;
Christoph Hellwiga885c8c2006-01-08 01:02:50 -08003102
Stefan Weinhuber65f8da42011-04-20 10:15:30 +02003103 base = dasd_device_from_gendisk(bdev->bd_disk);
3104 if (!base)
Christoph Hellwiga885c8c2006-01-08 01:02:50 -08003105 return -ENODEV;
3106
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01003107 if (!base->discipline ||
Stefan Weinhuber65f8da42011-04-20 10:15:30 +02003108 !base->discipline->fill_geometry) {
3109 dasd_put_device(base);
Christoph Hellwiga885c8c2006-01-08 01:02:50 -08003110 return -EINVAL;
Stefan Weinhuber65f8da42011-04-20 10:15:30 +02003111 }
3112 base->discipline->fill_geometry(base->block, geo);
3113 geo->start = get_start_sect(bdev) >> base->block->s2b_shift;
3114 dasd_put_device(base);
Christoph Hellwiga885c8c2006-01-08 01:02:50 -08003115 return 0;
3116}
3117
Alexey Dobriyan83d5cde2009-09-21 17:01:13 -07003118const struct block_device_operations
Linus Torvalds1da177e2005-04-16 15:20:36 -07003119dasd_device_operations = {
3120 .owner = THIS_MODULE,
Al Viro57a7c0b2008-03-02 10:36:08 -05003121 .open = dasd_open,
3122 .release = dasd_release,
Heiko Carstens0000d032009-03-26 15:23:45 +01003123 .ioctl = dasd_ioctl,
3124 .compat_ioctl = dasd_ioctl,
Christoph Hellwiga885c8c2006-01-08 01:02:50 -08003125 .getgeo = dasd_getgeo,
Linus Torvalds1da177e2005-04-16 15:20:36 -07003126};
3127
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01003128/*******************************************************************************
3129 * end of block device operations
3130 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07003131
3132static void
3133dasd_exit(void)
3134{
3135#ifdef CONFIG_PROC_FS
3136 dasd_proc_exit();
3137#endif
Stefan Weinhuber20c64462006-03-24 03:15:25 -08003138 dasd_eer_exit();
Horst Hummel6bb0e012005-07-27 11:45:03 -07003139 if (dasd_page_cache != NULL) {
3140 kmem_cache_destroy(dasd_page_cache);
3141 dasd_page_cache = NULL;
3142 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003143 dasd_gendisk_exit();
3144 dasd_devmap_exit();
Linus Torvalds1da177e2005-04-16 15:20:36 -07003145 if (dasd_debug_area != NULL) {
3146 debug_unregister(dasd_debug_area);
3147 dasd_debug_area = NULL;
3148 }
Stefan Weinhuber4fa52aa2011-07-24 10:48:32 +02003149 dasd_statistics_removeroot();
Linus Torvalds1da177e2005-04-16 15:20:36 -07003150}
3151
3152/*
3153 * SECTION: common functions for ccw_driver use
3154 */
3155
Stefan Weinhuber33b62a32010-03-08 12:26:24 +01003156/*
3157 * Is the device read-only?
3158 * Note that this function does not report the setting of the
3159 * readonly device attribute, but how it is configured in z/VM.
3160 */
3161int dasd_device_is_ro(struct dasd_device *device)
3162{
3163 struct ccw_dev_id dev_id;
3164 struct diag210 diag_data;
3165 int rc;
3166
3167 if (!MACHINE_IS_VM)
3168 return 0;
3169 ccw_device_get_id(device->cdev, &dev_id);
3170 memset(&diag_data, 0, sizeof(diag_data));
3171 diag_data.vrdcdvno = dev_id.devno;
3172 diag_data.vrdclen = sizeof(diag_data);
3173 rc = diag210(&diag_data);
3174 if (rc == 0 || rc == 2) {
3175 return diag_data.vrdcvfla & 0x80;
3176 } else {
3177 DBF_EVENT(DBF_WARNING, "diag210 failed for dev=%04x with rc=%d",
3178 dev_id.devno, rc);
3179 return 0;
3180 }
3181}
3182EXPORT_SYMBOL_GPL(dasd_device_is_ro);
3183
Cornelia Huckf3445a12009-04-14 15:36:23 +02003184static void dasd_generic_auto_online(void *data, async_cookie_t cookie)
3185{
3186 struct ccw_device *cdev = data;
3187 int ret;
3188
3189 ret = ccw_device_set_online(cdev);
3190 if (ret)
3191 pr_warning("%s: Setting the DASD online failed with rc=%d\n",
3192 dev_name(&cdev->dev), ret);
Cornelia Huckf3445a12009-04-14 15:36:23 +02003193}
3194
Horst Hummel1c01b8a2006-01-06 00:19:15 -08003195/*
3196 * Initial attempt at a probe function. this can be simplified once
3197 * the other detection code is gone.
3198 */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01003199int dasd_generic_probe(struct ccw_device *cdev,
3200 struct dasd_discipline *discipline)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003201{
3202 int ret;
3203
3204 ret = dasd_add_sysfs_files(cdev);
3205 if (ret) {
Stefan Haberlandb8ed5dd2009-12-07 12:51:52 +01003206 DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s",
3207 "dasd_generic_probe: could not add "
3208 "sysfs entries");
Horst Hummel40545572006-06-29 15:08:18 +02003209 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003210 }
Horst Hummel40545572006-06-29 15:08:18 +02003211 cdev->handler = &dasd_int_handler;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003212
Horst Hummel40545572006-06-29 15:08:18 +02003213 /*
3214 * Automatically online either all dasd devices (dasd_autodetect)
3215 * or all devices specified with dasd= parameters during
3216 * initial probe.
3217 */
3218 if ((dasd_get_feature(cdev, DASD_FEATURE_INITIAL_ONLINE) > 0 ) ||
Kay Sievers2a0217d2008-10-10 21:33:09 +02003219 (dasd_autodetect && dasd_busid_known(dev_name(&cdev->dev)) != 0))
Cornelia Huckf3445a12009-04-14 15:36:23 +02003220 async_schedule(dasd_generic_auto_online, cdev);
Stefan Haberlandde3e0da2008-01-26 14:11:08 +01003221 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003222}
3223
Horst Hummel1c01b8a2006-01-06 00:19:15 -08003224/*
3225 * This will one day be called from a global not_oper handler.
3226 * It is also used by driver_unregister during module unload.
3227 */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01003228void dasd_generic_remove(struct ccw_device *cdev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003229{
3230 struct dasd_device *device;
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01003231 struct dasd_block *block;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003232
Horst Hummel59afda72005-05-16 21:53:39 -07003233 cdev->handler = NULL;
3234
Linus Torvalds1da177e2005-04-16 15:20:36 -07003235 device = dasd_device_from_cdev(cdev);
Stefan Weinhuberbe4904e2013-02-04 13:10:35 +01003236 if (IS_ERR(device)) {
3237 dasd_remove_sysfs_files(cdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003238 return;
Stefan Weinhuberbe4904e2013-02-04 13:10:35 +01003239 }
Stefan Haberlandd07dc5d2012-11-28 13:43:38 +01003240 if (test_and_set_bit(DASD_FLAG_OFFLINE, &device->flags) &&
3241 !test_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07003242 /* Already doing offline processing */
3243 dasd_put_device(device);
Stefan Weinhuberbe4904e2013-02-04 13:10:35 +01003244 dasd_remove_sysfs_files(cdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003245 return;
3246 }
3247 /*
3248 * This device is removed unconditionally. Set offline
3249 * flag to prevent dasd_open from opening it while it is
3250 * no quite down yet.
3251 */
3252 dasd_set_target_state(device, DASD_STATE_NEW);
3253 /* dasd_delete_device destroys the device reference. */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01003254 block = device->block;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003255 dasd_delete_device(device);
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01003256 /*
3257 * life cycle of block is bound to device, so delete it after
3258 * device was safely removed
3259 */
3260 if (block)
3261 dasd_free_block(block);
Stefan Haberlandd07dc5d2012-11-28 13:43:38 +01003262
3263 dasd_remove_sysfs_files(cdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003264}
3265
Horst Hummel1c01b8a2006-01-06 00:19:15 -08003266/*
3267 * Activate a device. This is called from dasd_{eckd,fba}_probe() when either
Linus Torvalds1da177e2005-04-16 15:20:36 -07003268 * the device is detected for the first time and is supposed to be used
Horst Hummel1c01b8a2006-01-06 00:19:15 -08003269 * or the user has started activation through sysfs.
3270 */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01003271int dasd_generic_set_online(struct ccw_device *cdev,
3272 struct dasd_discipline *base_discipline)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003273{
Peter Oberparleiteraa888612006-02-20 18:28:13 -08003274 struct dasd_discipline *discipline;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003275 struct dasd_device *device;
Horst Hummelc6eb7b72005-09-03 15:57:58 -07003276 int rc;
Horst Hummelf24acd42005-05-01 08:58:59 -07003277
Horst Hummel40545572006-06-29 15:08:18 +02003278 /* first online clears initial online feature flag */
3279 dasd_set_feature(cdev, DASD_FEATURE_INITIAL_ONLINE, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003280 device = dasd_create_device(cdev);
3281 if (IS_ERR(device))
3282 return PTR_ERR(device);
3283
Peter Oberparleiteraa888612006-02-20 18:28:13 -08003284 discipline = base_discipline;
Horst Hummelc6eb7b72005-09-03 15:57:58 -07003285 if (device->features & DASD_FEATURE_USEDIAG) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07003286 if (!dasd_diag_discipline_pointer) {
Stefan Haberlandfc19f382009-03-26 15:23:49 +01003287 pr_warning("%s Setting the DASD online failed because "
3288 "of missing DIAG discipline\n",
3289 dev_name(&cdev->dev));
Linus Torvalds1da177e2005-04-16 15:20:36 -07003290 dasd_delete_device(device);
3291 return -ENODEV;
3292 }
3293 discipline = dasd_diag_discipline_pointer;
3294 }
Peter Oberparleiteraa888612006-02-20 18:28:13 -08003295 if (!try_module_get(base_discipline->owner)) {
3296 dasd_delete_device(device);
3297 return -EINVAL;
3298 }
3299 if (!try_module_get(discipline->owner)) {
3300 module_put(base_discipline->owner);
3301 dasd_delete_device(device);
3302 return -EINVAL;
3303 }
3304 device->base_discipline = base_discipline;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003305 device->discipline = discipline;
3306
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01003307 /* check_device will allocate block device if necessary */
Linus Torvalds1da177e2005-04-16 15:20:36 -07003308 rc = discipline->check_device(device);
3309 if (rc) {
Stefan Haberlandfc19f382009-03-26 15:23:49 +01003310 pr_warning("%s Setting the DASD online with discipline %s "
3311 "failed with rc=%i\n",
3312 dev_name(&cdev->dev), discipline->name, rc);
Peter Oberparleiteraa888612006-02-20 18:28:13 -08003313 module_put(discipline->owner);
3314 module_put(base_discipline->owner);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003315 dasd_delete_device(device);
3316 return rc;
3317 }
3318
3319 dasd_set_target_state(device, DASD_STATE_ONLINE);
3320 if (device->state <= DASD_STATE_KNOWN) {
Stefan Haberlandfc19f382009-03-26 15:23:49 +01003321 pr_warning("%s Setting the DASD online failed because of a "
3322 "missing discipline\n", dev_name(&cdev->dev));
Linus Torvalds1da177e2005-04-16 15:20:36 -07003323 rc = -ENODEV;
3324 dasd_set_target_state(device, DASD_STATE_NEW);
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01003325 if (device->block)
3326 dasd_free_block(device->block);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003327 dasd_delete_device(device);
3328 } else
3329 pr_debug("dasd_generic device %s found\n",
Kay Sievers2a0217d2008-10-10 21:33:09 +02003330 dev_name(&cdev->dev));
Stefan Haberland589c74d2010-02-26 22:37:47 +01003331
3332 wait_event(dasd_init_waitq, _wait_for_device(device));
3333
Linus Torvalds1da177e2005-04-16 15:20:36 -07003334 dasd_put_device(device);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003335 return rc;
3336}
3337
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01003338int dasd_generic_set_offline(struct ccw_device *cdev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003339{
3340 struct dasd_device *device;
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01003341 struct dasd_block *block;
Stefan Haberlandd07dc5d2012-11-28 13:43:38 +01003342 int max_count, open_count, rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003343
Stefan Haberlandd07dc5d2012-11-28 13:43:38 +01003344 rc = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003345 device = dasd_device_from_cdev(cdev);
3346 if (IS_ERR(device))
3347 return PTR_ERR(device);
Stefan Haberlandd07dc5d2012-11-28 13:43:38 +01003348
Linus Torvalds1da177e2005-04-16 15:20:36 -07003349 /*
3350 * We must make sure that this device is currently not in use.
3351 * The open_count is increased for every opener, that includes
3352 * the blkdev_get in dasd_scan_partitions. We are only interested
3353 * in the other openers.
3354 */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01003355 if (device->block) {
Heiko Carstensa8061702008-04-17 07:46:26 +02003356 max_count = device->block->bdev ? 0 : -1;
3357 open_count = atomic_read(&device->block->open_count);
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01003358 if (open_count > max_count) {
3359 if (open_count > 0)
Stefan Haberlandfc19f382009-03-26 15:23:49 +01003360 pr_warning("%s: The DASD cannot be set offline "
3361 "with open count %i\n",
3362 dev_name(&cdev->dev), open_count);
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01003363 else
Stefan Haberlandfc19f382009-03-26 15:23:49 +01003364 pr_warning("%s: The DASD cannot be set offline "
3365 "while it is in use\n",
3366 dev_name(&cdev->dev));
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01003367 clear_bit(DASD_FLAG_OFFLINE, &device->flags);
3368 dasd_put_device(device);
3369 return -EBUSY;
3370 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003371 }
Stefan Haberlandd07dc5d2012-11-28 13:43:38 +01003372
3373 if (test_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags)) {
3374 /*
3375 * safe offline allready running
3376 * could only be called by normal offline so safe_offline flag
3377 * needs to be removed to run normal offline and kill all I/O
3378 */
3379 if (test_and_set_bit(DASD_FLAG_OFFLINE, &device->flags)) {
3380 /* Already doing normal offline processing */
3381 dasd_put_device(device);
3382 return -EBUSY;
3383 } else
3384 clear_bit(DASD_FLAG_SAFE_OFFLINE, &device->flags);
3385
3386 } else
3387 if (test_bit(DASD_FLAG_OFFLINE, &device->flags)) {
3388 /* Already doing offline processing */
3389 dasd_put_device(device);
3390 return -EBUSY;
3391 }
3392
3393 /*
3394 * if safe_offline called set safe_offline_running flag and
3395 * clear safe_offline so that a call to normal offline
3396 * can overrun safe_offline processing
3397 */
3398 if (test_and_clear_bit(DASD_FLAG_SAFE_OFFLINE, &device->flags) &&
3399 !test_and_set_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags)) {
3400 /*
3401 * If we want to set the device safe offline all IO operations
3402 * should be finished before continuing the offline process
3403 * so sync bdev first and then wait for our queues to become
3404 * empty
3405 */
3406 /* sync blockdev and partitions */
3407 rc = fsync_bdev(device->block->bdev);
3408 if (rc != 0)
3409 goto interrupted;
3410
3411 /* schedule device tasklet and wait for completion */
3412 dasd_schedule_device_bh(device);
3413 rc = wait_event_interruptible(shutdown_waitq,
3414 _wait_for_empty_queues(device));
3415 if (rc != 0)
3416 goto interrupted;
3417 }
3418
3419 set_bit(DASD_FLAG_OFFLINE, &device->flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003420 dasd_set_target_state(device, DASD_STATE_NEW);
3421 /* dasd_delete_device destroys the device reference. */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01003422 block = device->block;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003423 dasd_delete_device(device);
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01003424 /*
3425 * life cycle of block is bound to device, so delete it after
3426 * device was safely removed
3427 */
3428 if (block)
3429 dasd_free_block(block);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003430 return 0;
Stefan Haberlandd07dc5d2012-11-28 13:43:38 +01003431
3432interrupted:
3433 /* interrupted by signal */
3434 clear_bit(DASD_FLAG_SAFE_OFFLINE, &device->flags);
3435 clear_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags);
3436 clear_bit(DASD_FLAG_OFFLINE, &device->flags);
3437 dasd_put_device(device);
3438 return rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003439}
3440
Stefan Weinhubera4d26c62011-01-05 12:48:03 +01003441int dasd_generic_last_path_gone(struct dasd_device *device)
3442{
3443 struct dasd_ccw_req *cqr;
3444
3445 dev_warn(&device->cdev->dev, "No operational channel path is left "
3446 "for the device\n");
3447 DBF_DEV_EVENT(DBF_WARNING, device, "%s", "last path gone");
3448 /* First of all call extended error reporting. */
3449 dasd_eer_write(device, NULL, DASD_EER_NOPATH);
3450
3451 if (device->state < DASD_STATE_BASIC)
3452 return 0;
3453 /* Device is active. We want to keep it. */
3454 list_for_each_entry(cqr, &device->ccw_queue, devlist)
3455 if ((cqr->status == DASD_CQR_IN_IO) ||
3456 (cqr->status == DASD_CQR_CLEAR_PENDING)) {
3457 cqr->status = DASD_CQR_QUEUED;
3458 cqr->retries++;
3459 }
3460 dasd_device_set_stop_bits(device, DASD_STOPPED_DC_WAIT);
3461 dasd_device_clear_timer(device);
3462 dasd_schedule_device_bh(device);
3463 return 1;
3464}
3465EXPORT_SYMBOL_GPL(dasd_generic_last_path_gone);
3466
3467int dasd_generic_path_operational(struct dasd_device *device)
3468{
3469 dev_info(&device->cdev->dev, "A channel path to the device has become "
3470 "operational\n");
3471 DBF_DEV_EVENT(DBF_WARNING, device, "%s", "path operational");
3472 dasd_device_remove_stop_bits(device, DASD_STOPPED_DC_WAIT);
3473 if (device->stopped & DASD_UNRESUMED_PM) {
3474 dasd_device_remove_stop_bits(device, DASD_UNRESUMED_PM);
3475 dasd_restore_device(device);
3476 return 1;
3477 }
3478 dasd_schedule_device_bh(device);
3479 if (device->block)
3480 dasd_schedule_block_bh(device->block);
3481 return 1;
3482}
3483EXPORT_SYMBOL_GPL(dasd_generic_path_operational);
3484
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01003485int dasd_generic_notify(struct ccw_device *cdev, int event)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003486{
3487 struct dasd_device *device;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003488 int ret;
3489
Peter Oberparleiter91c36912008-08-21 19:46:39 +02003490 device = dasd_device_from_cdev_locked(cdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003491 if (IS_ERR(device))
3492 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003493 ret = 0;
3494 switch (event) {
3495 case CIO_GONE:
Sebastian Ott47593bf2009-03-31 19:16:05 +02003496 case CIO_BOXED:
Linus Torvalds1da177e2005-04-16 15:20:36 -07003497 case CIO_NO_PATH:
Stefan Weinhubera4d26c62011-01-05 12:48:03 +01003498 device->path_data.opm = 0;
3499 device->path_data.ppm = 0;
3500 device->path_data.npm = 0;
3501 ret = dasd_generic_last_path_gone(device);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003502 break;
3503 case CIO_OPER:
Linus Torvalds1da177e2005-04-16 15:20:36 -07003504 ret = 1;
Stefan Weinhubera4d26c62011-01-05 12:48:03 +01003505 if (device->path_data.opm)
3506 ret = dasd_generic_path_operational(device);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003507 break;
3508 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003509 dasd_put_device(device);
3510 return ret;
3511}
3512
Stefan Weinhubera4d26c62011-01-05 12:48:03 +01003513void dasd_generic_path_event(struct ccw_device *cdev, int *path_event)
3514{
3515 int chp;
3516 __u8 oldopm, eventlpm;
3517 struct dasd_device *device;
3518
3519 device = dasd_device_from_cdev_locked(cdev);
3520 if (IS_ERR(device))
3521 return;
3522 for (chp = 0; chp < 8; chp++) {
3523 eventlpm = 0x80 >> chp;
3524 if (path_event[chp] & PE_PATH_GONE) {
3525 oldopm = device->path_data.opm;
3526 device->path_data.opm &= ~eventlpm;
3527 device->path_data.ppm &= ~eventlpm;
3528 device->path_data.npm &= ~eventlpm;
Stefan Weinhuber8b811ba2013-05-28 15:26:06 +02003529 if (oldopm && !device->path_data.opm) {
3530 dev_warn(&device->cdev->dev,
3531 "No verified channel paths remain "
3532 "for the device\n");
3533 DBF_DEV_EVENT(DBF_WARNING, device,
3534 "%s", "last verified path gone");
3535 dasd_eer_write(device, NULL, DASD_EER_NOPATH);
3536 dasd_device_set_stop_bits(device,
3537 DASD_STOPPED_DC_WAIT);
3538 }
Stefan Weinhubera4d26c62011-01-05 12:48:03 +01003539 }
3540 if (path_event[chp] & PE_PATH_AVAILABLE) {
3541 device->path_data.opm &= ~eventlpm;
3542 device->path_data.ppm &= ~eventlpm;
3543 device->path_data.npm &= ~eventlpm;
3544 device->path_data.tbvpm |= eventlpm;
3545 dasd_schedule_device_bh(device);
3546 }
Stefan Haberlandf1633032012-01-18 18:03:41 +01003547 if (path_event[chp] & PE_PATHGROUP_ESTABLISHED) {
Stefan Haberland12d7b102012-09-11 15:10:58 +02003548 if (!(device->path_data.opm & eventlpm) &&
3549 !(device->path_data.tbvpm & eventlpm)) {
3550 /*
3551 * we can not establish a pathgroup on an
3552 * unavailable path, so trigger a path
3553 * verification first
3554 */
3555 device->path_data.tbvpm |= eventlpm;
3556 dasd_schedule_device_bh(device);
3557 }
Stefan Haberlandf1633032012-01-18 18:03:41 +01003558 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
3559 "Pathgroup re-established\n");
3560 if (device->discipline->kick_validate)
3561 device->discipline->kick_validate(device);
3562 }
Stefan Weinhubera4d26c62011-01-05 12:48:03 +01003563 }
3564 dasd_put_device(device);
3565}
3566EXPORT_SYMBOL_GPL(dasd_generic_path_event);
3567
3568int dasd_generic_verify_path(struct dasd_device *device, __u8 lpm)
3569{
3570 if (!device->path_data.opm && lpm) {
3571 device->path_data.opm = lpm;
3572 dasd_generic_path_operational(device);
3573 } else
3574 device->path_data.opm |= lpm;
3575 return 0;
3576}
3577EXPORT_SYMBOL_GPL(dasd_generic_verify_path);
3578
3579
Stefan Haberlandd41dd122009-06-16 10:30:25 +02003580int dasd_generic_pm_freeze(struct ccw_device *cdev)
3581{
Stefan Haberlandd41dd122009-06-16 10:30:25 +02003582 struct dasd_device *device = dasd_device_from_cdev(cdev);
Stefan Haberlandc5576872013-04-15 16:41:31 +02003583 struct list_head freeze_queue;
3584 struct dasd_ccw_req *cqr, *n;
3585 struct dasd_ccw_req *refers;
3586 int rc;
Stefan Haberlandd41dd122009-06-16 10:30:25 +02003587
3588 if (IS_ERR(device))
3589 return PTR_ERR(device);
Stefan Haberland6f272b92011-01-05 12:48:05 +01003590
Stefan Haberlandc8d1c0f2011-10-30 15:17:09 +01003591 /* mark device as suspended */
3592 set_bit(DASD_FLAG_SUSPENDED, &device->flags);
3593
Stefan Haberland6f272b92011-01-05 12:48:05 +01003594 if (device->discipline->freeze)
3595 rc = device->discipline->freeze(device);
3596
Stefan Haberlandd41dd122009-06-16 10:30:25 +02003597 /* disallow new I/O */
Stefan Weinhubereb6e1992009-12-07 12:51:51 +01003598 dasd_device_set_stop_bits(device, DASD_STOPPED_PM);
Stefan Haberlandc5576872013-04-15 16:41:31 +02003599
3600 /* clear active requests and requeue them to block layer if possible */
Stefan Haberlandd41dd122009-06-16 10:30:25 +02003601 INIT_LIST_HEAD(&freeze_queue);
3602 spin_lock_irq(get_ccwdev_lock(cdev));
3603 rc = 0;
3604 list_for_each_entry_safe(cqr, n, &device->ccw_queue, devlist) {
3605 /* Check status and move request to flush_queue */
3606 if (cqr->status == DASD_CQR_IN_IO) {
3607 rc = device->discipline->term_IO(cqr);
3608 if (rc) {
3609 /* unable to terminate requeust */
3610 dev_err(&device->cdev->dev,
3611 "Unable to terminate request %p "
3612 "on suspend\n", cqr);
3613 spin_unlock_irq(get_ccwdev_lock(cdev));
3614 dasd_put_device(device);
3615 return rc;
3616 }
3617 }
3618 list_move_tail(&cqr->devlist, &freeze_queue);
3619 }
Stefan Haberlandd41dd122009-06-16 10:30:25 +02003620 spin_unlock_irq(get_ccwdev_lock(cdev));
3621
3622 list_for_each_entry_safe(cqr, n, &freeze_queue, devlist) {
3623 wait_event(dasd_flush_wq,
3624 (cqr->status != DASD_CQR_CLEAR_PENDING));
3625 if (cqr->status == DASD_CQR_CLEARED)
3626 cqr->status = DASD_CQR_QUEUED;
Stefan Haberlandd41dd122009-06-16 10:30:25 +02003627
Stefan Haberlandc5576872013-04-15 16:41:31 +02003628 /* requeue requests to blocklayer will only work for
3629 block device requests */
3630 if (_dasd_requeue_request(cqr))
3631 continue;
3632
3633 /* remove requests from device and block queue */
3634 list_del_init(&cqr->devlist);
3635 while (cqr->refers != NULL) {
3636 refers = cqr->refers;
3637 /* remove the request from the block queue */
3638 list_del(&cqr->blocklist);
3639 /* free the finished erp request */
3640 dasd_free_erp_request(cqr, cqr->memdev);
3641 cqr = refers;
3642 }
3643 if (cqr->block)
3644 list_del_init(&cqr->blocklist);
3645 cqr->block->base->discipline->free_cp(
3646 cqr, (struct request *) cqr->callback_data);
3647 }
3648
3649 /*
3650 * if requests remain then they are internal request
3651 * and go back to the device queue
3652 */
3653 if (!list_empty(&freeze_queue)) {
3654 /* move freeze_queue to start of the ccw_queue */
3655 spin_lock_irq(get_ccwdev_lock(cdev));
3656 list_splice_tail(&freeze_queue, &device->ccw_queue);
3657 spin_unlock_irq(get_ccwdev_lock(cdev));
3658 }
Stefan Haberlandd41dd122009-06-16 10:30:25 +02003659 dasd_put_device(device);
3660 return rc;
3661}
3662EXPORT_SYMBOL_GPL(dasd_generic_pm_freeze);
3663
3664int dasd_generic_restore_device(struct ccw_device *cdev)
3665{
3666 struct dasd_device *device = dasd_device_from_cdev(cdev);
3667 int rc = 0;
3668
3669 if (IS_ERR(device))
3670 return PTR_ERR(device);
3671
Stefan Haberlande6125fb2009-06-22 12:08:17 +02003672 /* allow new IO again */
Stefan Weinhubereb6e1992009-12-07 12:51:51 +01003673 dasd_device_remove_stop_bits(device,
3674 (DASD_STOPPED_PM | DASD_UNRESUMED_PM));
Stefan Haberlande6125fb2009-06-22 12:08:17 +02003675
Stefan Haberlandd41dd122009-06-16 10:30:25 +02003676 dasd_schedule_device_bh(device);
Stefan Haberlandd41dd122009-06-16 10:30:25 +02003677
Stefan Weinhubereb6e1992009-12-07 12:51:51 +01003678 /*
3679 * call discipline restore function
3680 * if device is stopped do nothing e.g. for disconnected devices
3681 */
3682 if (device->discipline->restore && !(device->stopped))
Stefan Haberlandd41dd122009-06-16 10:30:25 +02003683 rc = device->discipline->restore(device);
Stefan Weinhubereb6e1992009-12-07 12:51:51 +01003684 if (rc || device->stopped)
Stefan Haberlande6125fb2009-06-22 12:08:17 +02003685 /*
3686 * if the resume failed for the DASD we put it in
3687 * an UNRESUMED stop state
3688 */
3689 device->stopped |= DASD_UNRESUMED_PM;
Stefan Haberlandd41dd122009-06-16 10:30:25 +02003690
Stefan Haberland6fca97a2009-10-06 10:34:15 +02003691 if (device->block)
3692 dasd_schedule_block_bh(device->block);
3693
Stefan Haberlandc8d1c0f2011-10-30 15:17:09 +01003694 clear_bit(DASD_FLAG_SUSPENDED, &device->flags);
Stefan Haberlandd41dd122009-06-16 10:30:25 +02003695 dasd_put_device(device);
Stefan Haberlande6125fb2009-06-22 12:08:17 +02003696 return 0;
Stefan Haberlandd41dd122009-06-16 10:30:25 +02003697}
3698EXPORT_SYMBOL_GPL(dasd_generic_restore_device);
3699
Heiko Carstens763968e2007-05-10 15:45:46 +02003700static struct dasd_ccw_req *dasd_generic_build_rdc(struct dasd_device *device,
3701 void *rdc_buffer,
3702 int rdc_buffer_size,
Stefan Haberland68b781f2009-09-11 10:28:29 +02003703 int magic)
Cornelia Huck17283b52007-05-04 18:47:51 +02003704{
3705 struct dasd_ccw_req *cqr;
3706 struct ccw1 *ccw;
Stefan Haberlandd9fa9442009-10-14 12:43:48 +02003707 unsigned long *idaw;
Cornelia Huck17283b52007-05-04 18:47:51 +02003708
3709 cqr = dasd_smalloc_request(magic, 1 /* RDC */, rdc_buffer_size, device);
3710
3711 if (IS_ERR(cqr)) {
Stefan Haberlandfc19f382009-03-26 15:23:49 +01003712 /* internal error 13 - Allocating the RDC request failed*/
3713 dev_err(&device->cdev->dev,
3714 "An error occurred in the DASD device driver, "
3715 "reason=%s\n", "13");
Cornelia Huck17283b52007-05-04 18:47:51 +02003716 return cqr;
3717 }
3718
3719 ccw = cqr->cpaddr;
3720 ccw->cmd_code = CCW_CMD_RDC;
Stefan Haberlandd9fa9442009-10-14 12:43:48 +02003721 if (idal_is_needed(rdc_buffer, rdc_buffer_size)) {
3722 idaw = (unsigned long *) (cqr->data);
3723 ccw->cda = (__u32)(addr_t) idaw;
3724 ccw->flags = CCW_FLAG_IDA;
3725 idaw = idal_create_words(idaw, rdc_buffer, rdc_buffer_size);
3726 } else {
3727 ccw->cda = (__u32)(addr_t) rdc_buffer;
3728 ccw->flags = 0;
3729 }
Cornelia Huck17283b52007-05-04 18:47:51 +02003730
Stefan Haberlandd9fa9442009-10-14 12:43:48 +02003731 ccw->count = rdc_buffer_size;
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01003732 cqr->startdev = device;
3733 cqr->memdev = device;
Cornelia Huck17283b52007-05-04 18:47:51 +02003734 cqr->expires = 10*HZ;
Stefan Weinhubereb6e1992009-12-07 12:51:51 +01003735 cqr->retries = 256;
Heiko Carstens1aae0562013-01-30 09:49:40 +01003736 cqr->buildclk = get_tod_clock();
Cornelia Huck17283b52007-05-04 18:47:51 +02003737 cqr->status = DASD_CQR_FILLED;
3738 return cqr;
3739}
3740
3741
Stefan Haberland68b781f2009-09-11 10:28:29 +02003742int dasd_generic_read_dev_chars(struct dasd_device *device, int magic,
Sebastian Ott92636b12009-06-12 10:26:37 +02003743 void *rdc_buffer, int rdc_buffer_size)
Cornelia Huck17283b52007-05-04 18:47:51 +02003744{
3745 int ret;
3746 struct dasd_ccw_req *cqr;
3747
Sebastian Ott92636b12009-06-12 10:26:37 +02003748 cqr = dasd_generic_build_rdc(device, rdc_buffer, rdc_buffer_size,
Cornelia Huck17283b52007-05-04 18:47:51 +02003749 magic);
3750 if (IS_ERR(cqr))
3751 return PTR_ERR(cqr);
3752
3753 ret = dasd_sleep_on(cqr);
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01003754 dasd_sfree_request(cqr, cqr->memdev);
Cornelia Huck17283b52007-05-04 18:47:51 +02003755 return ret;
3756}
Cornelia Huckaaff0f62007-05-10 15:45:45 +02003757EXPORT_SYMBOL_GPL(dasd_generic_read_dev_chars);
Stefan Weinhuber20c64462006-03-24 03:15:25 -08003758
Stefan Weinhuberf3eb5382009-03-26 15:23:48 +01003759/*
3760 * In command mode and transport mode we need to look for sense
3761 * data in different places. The sense data itself is allways
3762 * an array of 32 bytes, so we can unify the sense data access
3763 * for both modes.
3764 */
3765char *dasd_get_sense(struct irb *irb)
3766{
3767 struct tsb *tsb = NULL;
3768 char *sense = NULL;
3769
3770 if (scsw_is_tm(&irb->scsw) && (irb->scsw.tm.fcxs == 0x01)) {
3771 if (irb->scsw.tm.tcw)
3772 tsb = tcw_get_tsb((struct tcw *)(unsigned long)
3773 irb->scsw.tm.tcw);
3774 if (tsb && tsb->length == 64 && tsb->flags)
3775 switch (tsb->flags & 0x07) {
3776 case 1: /* tsa_iostat */
3777 sense = tsb->tsa.iostat.sense;
3778 break;
3779 case 2: /* tsa_ddpc */
3780 sense = tsb->tsa.ddpc.sense;
3781 break;
3782 default:
3783 /* currently we don't use interrogate data */
3784 break;
3785 }
3786 } else if (irb->esw.esw0.erw.cons) {
3787 sense = irb->ecw;
3788 }
3789 return sense;
3790}
3791EXPORT_SYMBOL_GPL(dasd_get_sense);
3792
Stefan Haberland4679e892012-06-19 17:30:12 +02003793void dasd_generic_shutdown(struct ccw_device *cdev)
3794{
3795 struct dasd_device *device;
3796
3797 device = dasd_device_from_cdev(cdev);
3798 if (IS_ERR(device))
3799 return;
3800
3801 if (device->block)
3802 dasd_schedule_block_bh(device->block);
3803
3804 dasd_schedule_device_bh(device);
3805
3806 wait_event(shutdown_waitq, _wait_for_empty_queues(device));
3807}
3808EXPORT_SYMBOL_GPL(dasd_generic_shutdown);
3809
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01003810static int __init dasd_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003811{
3812 int rc;
3813
3814 init_waitqueue_head(&dasd_init_waitq);
Horst Hummel8f617012006-08-30 14:33:33 +02003815 init_waitqueue_head(&dasd_flush_wq);
Stefan Haberlandc80ee722008-05-30 10:03:31 +02003816 init_waitqueue_head(&generic_waitq);
Stefan Haberland4679e892012-06-19 17:30:12 +02003817 init_waitqueue_head(&shutdown_waitq);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003818
3819 /* register 'common' DASD debug area, used for all DBF_XXX calls */
Peter Tiedemann361f4942008-01-26 14:11:30 +01003820 dasd_debug_area = debug_register("dasd", 1, 1, 8 * sizeof(long));
Linus Torvalds1da177e2005-04-16 15:20:36 -07003821 if (dasd_debug_area == NULL) {
3822 rc = -ENOMEM;
3823 goto failed;
3824 }
3825 debug_register_view(dasd_debug_area, &debug_sprintf_view);
Horst Hummelb0035f12006-09-20 15:59:07 +02003826 debug_set_level(dasd_debug_area, DBF_WARNING);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003827
3828 DBF_EVENT(DBF_EMERG, "%s", "debug area created");
3829
3830 dasd_diag_discipline_pointer = NULL;
3831
Stefan Weinhuber4fa52aa2011-07-24 10:48:32 +02003832 dasd_statistics_createroot();
3833
Linus Torvalds1da177e2005-04-16 15:20:36 -07003834 rc = dasd_devmap_init();
3835 if (rc)
3836 goto failed;
3837 rc = dasd_gendisk_init();
3838 if (rc)
3839 goto failed;
3840 rc = dasd_parse();
3841 if (rc)
3842 goto failed;
Stefan Weinhuber20c64462006-03-24 03:15:25 -08003843 rc = dasd_eer_init();
3844 if (rc)
3845 goto failed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003846#ifdef CONFIG_PROC_FS
3847 rc = dasd_proc_init();
3848 if (rc)
3849 goto failed;
3850#endif
3851
3852 return 0;
3853failed:
Stefan Haberlandfc19f382009-03-26 15:23:49 +01003854 pr_info("The DASD device driver could not be initialized\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07003855 dasd_exit();
3856 return rc;
3857}
3858
3859module_init(dasd_init);
3860module_exit(dasd_exit);
3861
3862EXPORT_SYMBOL(dasd_debug_area);
3863EXPORT_SYMBOL(dasd_diag_discipline_pointer);
3864
3865EXPORT_SYMBOL(dasd_add_request_head);
3866EXPORT_SYMBOL(dasd_add_request_tail);
3867EXPORT_SYMBOL(dasd_cancel_req);
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01003868EXPORT_SYMBOL(dasd_device_clear_timer);
3869EXPORT_SYMBOL(dasd_block_clear_timer);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003870EXPORT_SYMBOL(dasd_enable_device);
3871EXPORT_SYMBOL(dasd_int_handler);
3872EXPORT_SYMBOL(dasd_kfree_request);
3873EXPORT_SYMBOL(dasd_kick_device);
3874EXPORT_SYMBOL(dasd_kmalloc_request);
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01003875EXPORT_SYMBOL(dasd_schedule_device_bh);
3876EXPORT_SYMBOL(dasd_schedule_block_bh);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003877EXPORT_SYMBOL(dasd_set_target_state);
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01003878EXPORT_SYMBOL(dasd_device_set_timer);
3879EXPORT_SYMBOL(dasd_block_set_timer);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003880EXPORT_SYMBOL(dasd_sfree_request);
3881EXPORT_SYMBOL(dasd_sleep_on);
3882EXPORT_SYMBOL(dasd_sleep_on_immediatly);
3883EXPORT_SYMBOL(dasd_sleep_on_interruptible);
3884EXPORT_SYMBOL(dasd_smalloc_request);
3885EXPORT_SYMBOL(dasd_start_IO);
3886EXPORT_SYMBOL(dasd_term_IO);
3887
3888EXPORT_SYMBOL_GPL(dasd_generic_probe);
3889EXPORT_SYMBOL_GPL(dasd_generic_remove);
3890EXPORT_SYMBOL_GPL(dasd_generic_notify);
3891EXPORT_SYMBOL_GPL(dasd_generic_set_online);
3892EXPORT_SYMBOL_GPL(dasd_generic_set_offline);
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01003893EXPORT_SYMBOL_GPL(dasd_generic_handle_state_change);
3894EXPORT_SYMBOL_GPL(dasd_flush_device_queue);
3895EXPORT_SYMBOL_GPL(dasd_alloc_block);
3896EXPORT_SYMBOL_GPL(dasd_free_block);