blob: f3509120a507f56e3b152e1dee4cb5990ce23d79 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * File...........: linux/drivers/s390/block/dasd.c
3 * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
4 * Horst Hummel <Horst.Hummel@de.ibm.com>
5 * Carsten Otte <Cotte@de.ibm.com>
6 * Martin Schwidefsky <schwidefsky@de.ibm.com>
7 * Bugreports.to..: <Linux390@de.ibm.com>
Stefan Haberlandd41dd122009-06-16 10:30:25 +02008 * Copyright IBM Corp. 1999, 2009
Linus Torvalds1da177e2005-04-16 15:20:36 -07009 */
10
Stefan Haberlandfc19f382009-03-26 15:23:49 +010011#define KMSG_COMPONENT "dasd"
12#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
13
Linus Torvalds1da177e2005-04-16 15:20:36 -070014#include <linux/kmod.h>
15#include <linux/init.h>
16#include <linux/interrupt.h>
17#include <linux/ctype.h>
18#include <linux/major.h>
19#include <linux/slab.h>
Christoph Hellwiga885c8c2006-01-08 01:02:50 -080020#include <linux/hdreg.h>
Cornelia Huckf3445a12009-04-14 15:36:23 +020021#include <linux/async.h>
Stefan Haberland9eb25122010-02-26 22:37:46 +010022#include <linux/mutex.h>
Stefan Weinhuber4fa52aa2011-07-24 10:48:32 +020023#include <linux/debugfs.h>
24#include <linux/seq_file.h>
Stefan Weinhubere4258d52011-08-03 16:44:20 +020025#include <linux/vmalloc.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070026
27#include <asm/ccwdev.h>
28#include <asm/ebcdic.h>
29#include <asm/idals.h>
Stefan Weinhuberf3eb5382009-03-26 15:23:48 +010030#include <asm/itcw.h>
Stefan Weinhuber33b62a32010-03-08 12:26:24 +010031#include <asm/diag.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070032
33/* This is ugly... */
34#define PRINTK_HEADER "dasd:"
35
36#include "dasd_int.h"
37/*
38 * SECTION: Constant definitions to be used within this file
39 */
40#define DASD_CHANQ_MAX_SIZE 4
41
Stefan Weinhuber1c1e0932010-05-12 09:32:11 +020042#define DASD_SLEEPON_START_TAG (void *) 1
43#define DASD_SLEEPON_END_TAG (void *) 2
44
Linus Torvalds1da177e2005-04-16 15:20:36 -070045/*
46 * SECTION: exported variables of dasd.c
47 */
48debug_info_t *dasd_debug_area;
Stefan Weinhuber4fa52aa2011-07-24 10:48:32 +020049static struct dentry *dasd_debugfs_root_entry;
Linus Torvalds1da177e2005-04-16 15:20:36 -070050struct dasd_discipline *dasd_diag_discipline_pointer;
Heiko Carstens2b67fc42007-02-05 21:16:47 +010051void dasd_int_handler(struct ccw_device *, unsigned long, struct irb *);
Linus Torvalds1da177e2005-04-16 15:20:36 -070052
53MODULE_AUTHOR("Holger Smolinski <Holger.Smolinski@de.ibm.com>");
54MODULE_DESCRIPTION("Linux on S/390 DASD device driver,"
55 " Copyright 2000 IBM Corporation");
56MODULE_SUPPORTED_DEVICE("dasd");
Linus Torvalds1da177e2005-04-16 15:20:36 -070057MODULE_LICENSE("GPL");
58
59/*
60 * SECTION: prototypes for static functions of dasd.c
61 */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +010062static int dasd_alloc_queue(struct dasd_block *);
63static void dasd_setup_queue(struct dasd_block *);
64static void dasd_free_queue(struct dasd_block *);
65static void dasd_flush_request_queue(struct dasd_block *);
66static int dasd_flush_block_queue(struct dasd_block *);
67static void dasd_device_tasklet(struct dasd_device *);
68static void dasd_block_tasklet(struct dasd_block *);
Al Viro4927b3f2006-12-06 19:18:20 +000069static void do_kick_device(struct work_struct *);
Stefan Haberlandd41dd122009-06-16 10:30:25 +020070static void do_restore_device(struct work_struct *);
Stefan Haberland501183f2010-05-17 10:00:10 +020071static void do_reload_device(struct work_struct *);
Stefan Weinhuber8e09f212008-01-26 14:11:23 +010072static void dasd_return_cqr_cb(struct dasd_ccw_req *, void *);
Stefan Weinhuber48cae882009-02-11 10:37:31 +010073static void dasd_device_timeout(unsigned long);
74static void dasd_block_timeout(unsigned long);
Stefan Weinhubereb6e1992009-12-07 12:51:51 +010075static void __dasd_process_erp(struct dasd_device *, struct dasd_ccw_req *);
Stefan Weinhuber4fa52aa2011-07-24 10:48:32 +020076static void dasd_profile_init(struct dasd_profile *, struct dentry *);
77static void dasd_profile_exit(struct dasd_profile *);
Linus Torvalds1da177e2005-04-16 15:20:36 -070078
79/*
80 * SECTION: Operations on the device structure.
81 */
82static wait_queue_head_t dasd_init_waitq;
Horst Hummel8f617012006-08-30 14:33:33 +020083static wait_queue_head_t dasd_flush_wq;
Stefan Haberlandc80ee722008-05-30 10:03:31 +020084static wait_queue_head_t generic_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;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249 int rc;
250
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;
276 return 0;
277}
278
279/*
280 * Release the irq line for the device. Terminate any running i/o.
281 */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100282static int dasd_state_basic_to_known(struct dasd_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700283{
Horst Hummel8f617012006-08-30 14:33:33 +0200284 int rc;
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100285 if (device->block) {
Stefan Weinhuber4fa52aa2011-07-24 10:48:32 +0200286 dasd_profile_exit(&device->block->profile);
287 if (device->block->debugfs_dentry)
288 debugfs_remove(device->block->debugfs_dentry);
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100289 dasd_gendisk_free(device->block);
290 dasd_block_clear_timer(device->block);
291 }
292 rc = dasd_flush_device_queue(device);
Horst Hummel8f617012006-08-30 14:33:33 +0200293 if (rc)
294 return rc;
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100295 dasd_device_clear_timer(device);
Stefan Weinhuber4fa52aa2011-07-24 10:48:32 +0200296 dasd_profile_exit(&device->profile);
297 if (device->debugfs_dentry)
298 debugfs_remove(device->debugfs_dentry);
Horst Hummel8f617012006-08-30 14:33:33 +0200299
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300 DBF_DEV_EVENT(DBF_EMERG, device, "%p debug area deleted", device);
301 if (device->debug_area != NULL) {
302 debug_unregister(device->debug_area);
303 device->debug_area = NULL;
304 }
305 device->state = DASD_STATE_KNOWN;
Horst Hummel8f617012006-08-30 14:33:33 +0200306 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700307}
308
309/*
310 * Do the initial analysis. The do_analysis function may return
311 * -EAGAIN in which case the device keeps the state DASD_STATE_BASIC
312 * until the discipline decides to continue the startup sequence
313 * by calling the function dasd_change_state. The eckd disciplines
314 * uses this to start a ccw that detects the format. The completion
315 * interrupt for this detection ccw uses the kernel event daemon to
316 * trigger the call to dasd_change_state. All this is done in the
317 * discipline code, see dasd_eckd.c.
Horst Hummel90f00942006-03-07 21:55:39 -0800318 * After the analysis ccw is done (do_analysis returned 0) the block
319 * device is setup.
320 * In case the analysis returns an error, the device setup is stopped
321 * (a fake disk was already added to allow formatting).
Linus Torvalds1da177e2005-04-16 15:20:36 -0700322 */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100323static int dasd_state_basic_to_ready(struct dasd_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700324{
325 int rc;
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100326 struct dasd_block *block;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700327
328 rc = 0;
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100329 block = device->block;
Horst Hummel90f00942006-03-07 21:55:39 -0800330 /* make disk known with correct capacity */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100331 if (block) {
332 if (block->base->discipline->do_analysis != NULL)
333 rc = block->base->discipline->do_analysis(block);
334 if (rc) {
335 if (rc != -EAGAIN)
336 device->state = DASD_STATE_UNFMT;
337 return rc;
338 }
339 dasd_setup_queue(block);
340 set_capacity(block->gdp,
341 block->blocks << block->s2b_shift);
342 device->state = DASD_STATE_READY;
343 rc = dasd_scan_partitions(block);
344 if (rc)
345 device->state = DASD_STATE_BASIC;
346 } else {
347 device->state = DASD_STATE_READY;
348 }
Horst Hummel90f00942006-03-07 21:55:39 -0800349 return rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700350}
351
352/*
353 * Remove device from block device layer. Destroy dirty buffers.
354 * Forget format information. Check if the target level is basic
355 * and if it is create fake disk for formatting.
356 */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100357static int dasd_state_ready_to_basic(struct dasd_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700358{
Horst Hummel8f617012006-08-30 14:33:33 +0200359 int rc;
360
Linus Torvalds1da177e2005-04-16 15:20:36 -0700361 device->state = DASD_STATE_BASIC;
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100362 if (device->block) {
363 struct dasd_block *block = device->block;
364 rc = dasd_flush_block_queue(block);
365 if (rc) {
366 device->state = DASD_STATE_READY;
367 return rc;
368 }
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100369 dasd_flush_request_queue(block);
Stefan Haberlandb695adf2010-02-26 22:37:48 +0100370 dasd_destroy_partitions(block);
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100371 block->blocks = 0;
372 block->bp_block = 0;
373 block->s2b_shift = 0;
374 }
Horst Hummel8f617012006-08-30 14:33:33 +0200375 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700376}
377
378/*
Horst Hummel90f00942006-03-07 21:55:39 -0800379 * Back to basic.
380 */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100381static int dasd_state_unfmt_to_basic(struct dasd_device *device)
Horst Hummel90f00942006-03-07 21:55:39 -0800382{
383 device->state = DASD_STATE_BASIC;
Horst Hummel8f617012006-08-30 14:33:33 +0200384 return 0;
Horst Hummel90f00942006-03-07 21:55:39 -0800385}
386
387/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700388 * Make the device online and schedule the bottom half to start
389 * the requeueing of requests from the linux request queue to the
390 * ccw queue.
391 */
Horst Hummel8f617012006-08-30 14:33:33 +0200392static int
Linus Torvalds1da177e2005-04-16 15:20:36 -0700393dasd_state_ready_to_online(struct dasd_device * device)
394{
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100395 int rc;
Stefan Weinhuber13018092009-01-09 12:14:50 +0100396 struct gendisk *disk;
397 struct disk_part_iter piter;
398 struct hd_struct *part;
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100399
400 if (device->discipline->ready_to_online) {
401 rc = device->discipline->ready_to_online(device);
402 if (rc)
403 return rc;
404 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700405 device->state = DASD_STATE_ONLINE;
Stefan Weinhuber13018092009-01-09 12:14:50 +0100406 if (device->block) {
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100407 dasd_schedule_block_bh(device->block);
Stefan Haberlande4dbb0f2011-01-05 12:48:06 +0100408 if ((device->features & DASD_FEATURE_USERAW)) {
409 disk = device->block->gdp;
410 kobject_uevent(&disk_to_dev(disk)->kobj, KOBJ_CHANGE);
411 return 0;
412 }
Stefan Weinhuber13018092009-01-09 12:14:50 +0100413 disk = device->block->bdev->bd_disk;
414 disk_part_iter_init(&piter, disk, DISK_PITER_INCL_PART0);
415 while ((part = disk_part_iter_next(&piter)))
416 kobject_uevent(&part_to_dev(part)->kobj, KOBJ_CHANGE);
417 disk_part_iter_exit(&piter);
418 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700419 return 0;
420}
421
422/*
423 * Stop the requeueing of requests again.
424 */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100425static int dasd_state_online_to_ready(struct dasd_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700426{
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100427 int rc;
Stefan Weinhuber13018092009-01-09 12:14:50 +0100428 struct gendisk *disk;
429 struct disk_part_iter piter;
430 struct hd_struct *part;
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100431
432 if (device->discipline->online_to_ready) {
433 rc = device->discipline->online_to_ready(device);
434 if (rc)
435 return rc;
436 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700437 device->state = DASD_STATE_READY;
Stefan Haberlande4dbb0f2011-01-05 12:48:06 +0100438 if (device->block && !(device->features & DASD_FEATURE_USERAW)) {
Stefan Weinhuber13018092009-01-09 12:14:50 +0100439 disk = device->block->bdev->bd_disk;
440 disk_part_iter_init(&piter, disk, DISK_PITER_INCL_PART0);
441 while ((part = disk_part_iter_next(&piter)))
442 kobject_uevent(&part_to_dev(part)->kobj, KOBJ_CHANGE);
443 disk_part_iter_exit(&piter);
444 }
Horst Hummel8f617012006-08-30 14:33:33 +0200445 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700446}
447
448/*
449 * Device startup state changes.
450 */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100451static int dasd_increase_state(struct dasd_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700452{
453 int rc;
454
455 rc = 0;
456 if (device->state == DASD_STATE_NEW &&
457 device->target >= DASD_STATE_KNOWN)
458 rc = dasd_state_new_to_known(device);
459
460 if (!rc &&
461 device->state == DASD_STATE_KNOWN &&
462 device->target >= DASD_STATE_BASIC)
463 rc = dasd_state_known_to_basic(device);
464
465 if (!rc &&
466 device->state == DASD_STATE_BASIC &&
467 device->target >= DASD_STATE_READY)
468 rc = dasd_state_basic_to_ready(device);
469
470 if (!rc &&
Horst Hummel39ccf952006-04-27 18:40:10 -0700471 device->state == DASD_STATE_UNFMT &&
472 device->target > DASD_STATE_UNFMT)
473 rc = -EPERM;
474
475 if (!rc &&
Linus Torvalds1da177e2005-04-16 15:20:36 -0700476 device->state == DASD_STATE_READY &&
477 device->target >= DASD_STATE_ONLINE)
478 rc = dasd_state_ready_to_online(device);
479
480 return rc;
481}
482
483/*
484 * Device shutdown state changes.
485 */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100486static int dasd_decrease_state(struct dasd_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700487{
Horst Hummel8f617012006-08-30 14:33:33 +0200488 int rc;
489
490 rc = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700491 if (device->state == DASD_STATE_ONLINE &&
492 device->target <= DASD_STATE_READY)
Horst Hummel8f617012006-08-30 14:33:33 +0200493 rc = dasd_state_online_to_ready(device);
Horst Hummel138c0142006-06-29 14:58:12 +0200494
Horst Hummel8f617012006-08-30 14:33:33 +0200495 if (!rc &&
496 device->state == DASD_STATE_READY &&
Linus Torvalds1da177e2005-04-16 15:20:36 -0700497 device->target <= DASD_STATE_BASIC)
Horst Hummel8f617012006-08-30 14:33:33 +0200498 rc = dasd_state_ready_to_basic(device);
Horst Hummel90f00942006-03-07 21:55:39 -0800499
Horst Hummel8f617012006-08-30 14:33:33 +0200500 if (!rc &&
501 device->state == DASD_STATE_UNFMT &&
Horst Hummel90f00942006-03-07 21:55:39 -0800502 device->target <= DASD_STATE_BASIC)
Horst Hummel8f617012006-08-30 14:33:33 +0200503 rc = dasd_state_unfmt_to_basic(device);
Horst Hummel90f00942006-03-07 21:55:39 -0800504
Horst Hummel8f617012006-08-30 14:33:33 +0200505 if (!rc &&
506 device->state == DASD_STATE_BASIC &&
Linus Torvalds1da177e2005-04-16 15:20:36 -0700507 device->target <= DASD_STATE_KNOWN)
Horst Hummel8f617012006-08-30 14:33:33 +0200508 rc = dasd_state_basic_to_known(device);
Horst Hummel138c0142006-06-29 14:58:12 +0200509
Horst Hummel8f617012006-08-30 14:33:33 +0200510 if (!rc &&
511 device->state == DASD_STATE_KNOWN &&
Linus Torvalds1da177e2005-04-16 15:20:36 -0700512 device->target <= DASD_STATE_NEW)
Horst Hummel8f617012006-08-30 14:33:33 +0200513 rc = dasd_state_known_to_new(device);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700514
Horst Hummel8f617012006-08-30 14:33:33 +0200515 return rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700516}
517
518/*
519 * This is the main startup/shutdown routine.
520 */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100521static void dasd_change_state(struct dasd_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700522{
Sebastian Ott181d9522009-06-22 12:08:21 +0200523 int rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700524
525 if (device->state == device->target)
526 /* Already where we want to go today... */
527 return;
528 if (device->state < device->target)
529 rc = dasd_increase_state(device);
530 else
531 rc = dasd_decrease_state(device);
Sebastian Ott181d9522009-06-22 12:08:21 +0200532 if (rc == -EAGAIN)
533 return;
534 if (rc)
535 device->target = device->state;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700536
Stefan Haberland9eb25122010-02-26 22:37:46 +0100537 if (device->state == device->target)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700538 wake_up(&dasd_init_waitq);
Horst Hummel4dfd5c42007-04-27 16:01:47 +0200539
540 /* let user-space know that the device status changed */
541 kobject_uevent(&device->cdev->dev.kobj, KOBJ_CHANGE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700542}
543
544/*
545 * Kick starter for devices that did not complete the startup/shutdown
546 * procedure or were sleeping because of a pending state.
547 * dasd_kick_device will schedule a call do do_kick_device to the kernel
548 * event daemon.
549 */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100550static void do_kick_device(struct work_struct *work)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700551{
Al Viro4927b3f2006-12-06 19:18:20 +0000552 struct dasd_device *device = container_of(work, struct dasd_device, kick_work);
Stefan Haberland9eb25122010-02-26 22:37:46 +0100553 mutex_lock(&device->state_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700554 dasd_change_state(device);
Stefan Haberland9eb25122010-02-26 22:37:46 +0100555 mutex_unlock(&device->state_mutex);
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100556 dasd_schedule_device_bh(device);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700557 dasd_put_device(device);
558}
559
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100560void dasd_kick_device(struct dasd_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700561{
562 dasd_get_device(device);
563 /* queue call to dasd_kick_device to the kernel event daemon. */
564 schedule_work(&device->kick_work);
565}
566
567/*
Stefan Haberland501183f2010-05-17 10:00:10 +0200568 * dasd_reload_device will schedule a call do do_reload_device to the kernel
569 * event daemon.
570 */
571static void do_reload_device(struct work_struct *work)
572{
573 struct dasd_device *device = container_of(work, struct dasd_device,
574 reload_device);
575 device->discipline->reload(device);
576 dasd_put_device(device);
577}
578
579void dasd_reload_device(struct dasd_device *device)
580{
581 dasd_get_device(device);
582 /* queue call to dasd_reload_device to the kernel event daemon. */
583 schedule_work(&device->reload_device);
584}
585EXPORT_SYMBOL(dasd_reload_device);
586
587/*
Stefan Haberlandd41dd122009-06-16 10:30:25 +0200588 * dasd_restore_device will schedule a call do do_restore_device to the kernel
589 * event daemon.
590 */
591static void do_restore_device(struct work_struct *work)
592{
593 struct dasd_device *device = container_of(work, struct dasd_device,
594 restore_device);
595 device->cdev->drv->restore(device->cdev);
596 dasd_put_device(device);
597}
598
599void dasd_restore_device(struct dasd_device *device)
600{
601 dasd_get_device(device);
602 /* queue call to dasd_restore_device to the kernel event daemon. */
603 schedule_work(&device->restore_device);
604}
605
606/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700607 * Set the target state for a device and starts the state change.
608 */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100609void dasd_set_target_state(struct dasd_device *device, int target)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700610{
Cornelia Huckf3445a12009-04-14 15:36:23 +0200611 dasd_get_device(device);
Stefan Haberland9eb25122010-02-26 22:37:46 +0100612 mutex_lock(&device->state_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700613 /* If we are in probeonly mode stop at DASD_STATE_READY. */
614 if (dasd_probeonly && target > DASD_STATE_READY)
615 target = DASD_STATE_READY;
616 if (device->target != target) {
Stefan Haberland9eb25122010-02-26 22:37:46 +0100617 if (device->state == target)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700618 wake_up(&dasd_init_waitq);
619 device->target = target;
620 }
621 if (device->state != device->target)
622 dasd_change_state(device);
Stefan Haberland9eb25122010-02-26 22:37:46 +0100623 mutex_unlock(&device->state_mutex);
624 dasd_put_device(device);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700625}
626
627/*
628 * Enable devices with device numbers in [from..to].
629 */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100630static inline int _wait_for_device(struct dasd_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700631{
632 return (device->state == device->target);
633}
634
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100635void dasd_enable_device(struct dasd_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700636{
637 dasd_set_target_state(device, DASD_STATE_ONLINE);
638 if (device->state <= DASD_STATE_KNOWN)
639 /* No discipline for device found. */
640 dasd_set_target_state(device, DASD_STATE_NEW);
641 /* Now wait for the devices to come up. */
642 wait_event(dasd_init_waitq, _wait_for_device(device));
Stefan Haberland25e2cf12012-03-11 11:59:37 -0400643
644 dasd_reload_device(device);
645 if (device->discipline->kick_validate)
646 device->discipline->kick_validate(device);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700647}
648
649/*
650 * SECTION: device operation (interrupt handler, start i/o, term i/o ...)
651 */
Stefan Weinhuber4fa52aa2011-07-24 10:48:32 +0200652
653unsigned int dasd_global_profile_level = DASD_PROFILE_OFF;
654
Linus Torvalds1da177e2005-04-16 15:20:36 -0700655#ifdef CONFIG_DASD_PROFILE
Stefan Weinhuber4fa52aa2011-07-24 10:48:32 +0200656struct dasd_profile_info dasd_global_profile_data;
657static struct dentry *dasd_global_profile_dentry;
658static struct dentry *dasd_debugfs_global_entry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700659
660/*
661 * Add profiling information for cqr before execution.
662 */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100663static void dasd_profile_start(struct dasd_block *block,
664 struct dasd_ccw_req *cqr,
665 struct request *req)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700666{
667 struct list_head *l;
668 unsigned int counter;
Stefan Weinhuber4fa52aa2011-07-24 10:48:32 +0200669 struct dasd_device *device;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700670
671 /* count the length of the chanq for statistics */
672 counter = 0;
Stefan Weinhuber4fa52aa2011-07-24 10:48:32 +0200673 if (dasd_global_profile_level || block->profile.data)
674 list_for_each(l, &block->ccw_queue)
675 if (++counter >= 31)
676 break;
677
678 if (dasd_global_profile_level) {
679 dasd_global_profile_data.dasd_io_nr_req[counter]++;
680 if (rq_data_dir(req) == READ)
681 dasd_global_profile_data.dasd_read_nr_req[counter]++;
682 }
683
684 spin_lock(&block->profile.lock);
685 if (block->profile.data)
686 block->profile.data->dasd_io_nr_req[counter]++;
687 if (rq_data_dir(req) == READ)
688 block->profile.data->dasd_read_nr_req[counter]++;
689 spin_unlock(&block->profile.lock);
690
691 /*
692 * We count the request for the start device, even though it may run on
693 * some other device due to error recovery. This way we make sure that
694 * we count each request only once.
695 */
696 device = cqr->startdev;
697 if (device->profile.data) {
698 counter = 1; /* request is not yet queued on the start device */
699 list_for_each(l, &device->ccw_queue)
700 if (++counter >= 31)
701 break;
702 }
703 spin_lock(&device->profile.lock);
704 if (device->profile.data) {
705 device->profile.data->dasd_io_nr_req[counter]++;
706 if (rq_data_dir(req) == READ)
707 device->profile.data->dasd_read_nr_req[counter]++;
708 }
709 spin_unlock(&device->profile.lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700710}
711
712/*
713 * Add profiling information for cqr after execution.
714 */
Stefan Weinhuber4fa52aa2011-07-24 10:48:32 +0200715
716#define dasd_profile_counter(value, index) \
717{ \
718 for (index = 0; index < 31 && value >> (2+index); index++) \
719 ; \
720}
721
722static void dasd_profile_end_add_data(struct dasd_profile_info *data,
723 int is_alias,
724 int is_tpm,
725 int is_read,
726 long sectors,
727 int sectors_ind,
728 int tottime_ind,
729 int tottimeps_ind,
730 int strtime_ind,
731 int irqtime_ind,
732 int irqtimeps_ind,
733 int endtime_ind)
734{
735 /* in case of an overflow, reset the whole profile */
736 if (data->dasd_io_reqs == UINT_MAX) {
737 memset(data, 0, sizeof(*data));
738 getnstimeofday(&data->starttod);
739 }
740 data->dasd_io_reqs++;
741 data->dasd_io_sects += sectors;
742 if (is_alias)
743 data->dasd_io_alias++;
744 if (is_tpm)
745 data->dasd_io_tpm++;
746
747 data->dasd_io_secs[sectors_ind]++;
748 data->dasd_io_times[tottime_ind]++;
749 data->dasd_io_timps[tottimeps_ind]++;
750 data->dasd_io_time1[strtime_ind]++;
751 data->dasd_io_time2[irqtime_ind]++;
752 data->dasd_io_time2ps[irqtimeps_ind]++;
753 data->dasd_io_time3[endtime_ind]++;
754
755 if (is_read) {
756 data->dasd_read_reqs++;
757 data->dasd_read_sects += sectors;
758 if (is_alias)
759 data->dasd_read_alias++;
760 if (is_tpm)
761 data->dasd_read_tpm++;
762 data->dasd_read_secs[sectors_ind]++;
763 data->dasd_read_times[tottime_ind]++;
764 data->dasd_read_time1[strtime_ind]++;
765 data->dasd_read_time2[irqtime_ind]++;
766 data->dasd_read_time3[endtime_ind]++;
767 }
768}
769
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100770static void dasd_profile_end(struct dasd_block *block,
771 struct dasd_ccw_req *cqr,
772 struct request *req)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700773{
774 long strtime, irqtime, endtime, tottime; /* in microseconds */
775 long tottimeps, sectors;
Stefan Weinhuber4fa52aa2011-07-24 10:48:32 +0200776 struct dasd_device *device;
777 int sectors_ind, tottime_ind, tottimeps_ind, strtime_ind;
778 int irqtime_ind, irqtimeps_ind, endtime_ind;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700779
Stefan Weinhuber4fa52aa2011-07-24 10:48:32 +0200780 device = cqr->startdev;
781 if (!(dasd_global_profile_level ||
782 block->profile.data ||
783 device->profile.data))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700784 return;
785
Tejun Heo83096eb2009-05-07 22:24:39 +0900786 sectors = blk_rq_sectors(req);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700787 if (!cqr->buildclk || !cqr->startclk ||
788 !cqr->stopclk || !cqr->endclk ||
789 !sectors)
790 return;
791
792 strtime = ((cqr->startclk - cqr->buildclk) >> 12);
793 irqtime = ((cqr->stopclk - cqr->startclk) >> 12);
794 endtime = ((cqr->endclk - cqr->stopclk) >> 12);
795 tottime = ((cqr->endclk - cqr->buildclk) >> 12);
796 tottimeps = tottime / sectors;
797
Stefan Weinhuber4fa52aa2011-07-24 10:48:32 +0200798 dasd_profile_counter(sectors, sectors_ind);
799 dasd_profile_counter(tottime, tottime_ind);
800 dasd_profile_counter(tottimeps, tottimeps_ind);
801 dasd_profile_counter(strtime, strtime_ind);
802 dasd_profile_counter(irqtime, irqtime_ind);
803 dasd_profile_counter(irqtime / sectors, irqtimeps_ind);
804 dasd_profile_counter(endtime, endtime_ind);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700805
Stefan Weinhuber4fa52aa2011-07-24 10:48:32 +0200806 if (dasd_global_profile_level) {
807 dasd_profile_end_add_data(&dasd_global_profile_data,
808 cqr->startdev != block->base,
809 cqr->cpmode == 1,
810 rq_data_dir(req) == READ,
811 sectors, sectors_ind, tottime_ind,
812 tottimeps_ind, strtime_ind,
813 irqtime_ind, irqtimeps_ind,
814 endtime_ind);
815 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700816
Stefan Weinhuber4fa52aa2011-07-24 10:48:32 +0200817 spin_lock(&block->profile.lock);
818 if (block->profile.data)
819 dasd_profile_end_add_data(block->profile.data,
820 cqr->startdev != block->base,
821 cqr->cpmode == 1,
822 rq_data_dir(req) == READ,
823 sectors, sectors_ind, tottime_ind,
824 tottimeps_ind, strtime_ind,
825 irqtime_ind, irqtimeps_ind,
826 endtime_ind);
827 spin_unlock(&block->profile.lock);
828
829 spin_lock(&device->profile.lock);
830 if (device->profile.data)
831 dasd_profile_end_add_data(device->profile.data,
832 cqr->startdev != block->base,
833 cqr->cpmode == 1,
834 rq_data_dir(req) == READ,
835 sectors, sectors_ind, tottime_ind,
836 tottimeps_ind, strtime_ind,
837 irqtime_ind, irqtimeps_ind,
838 endtime_ind);
839 spin_unlock(&device->profile.lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700840}
Stefan Weinhuber4fa52aa2011-07-24 10:48:32 +0200841
842void dasd_profile_reset(struct dasd_profile *profile)
843{
844 struct dasd_profile_info *data;
845
846 spin_lock_bh(&profile->lock);
847 data = profile->data;
848 if (!data) {
849 spin_unlock_bh(&profile->lock);
850 return;
851 }
852 memset(data, 0, sizeof(*data));
853 getnstimeofday(&data->starttod);
854 spin_unlock_bh(&profile->lock);
855}
856
857void dasd_global_profile_reset(void)
858{
859 memset(&dasd_global_profile_data, 0, sizeof(dasd_global_profile_data));
860 getnstimeofday(&dasd_global_profile_data.starttod);
861}
862
863int dasd_profile_on(struct dasd_profile *profile)
864{
865 struct dasd_profile_info *data;
866
867 data = kzalloc(sizeof(*data), GFP_KERNEL);
868 if (!data)
869 return -ENOMEM;
870 spin_lock_bh(&profile->lock);
871 if (profile->data) {
872 spin_unlock_bh(&profile->lock);
873 kfree(data);
874 return 0;
875 }
876 getnstimeofday(&data->starttod);
877 profile->data = data;
878 spin_unlock_bh(&profile->lock);
879 return 0;
880}
881
882void dasd_profile_off(struct dasd_profile *profile)
883{
884 spin_lock_bh(&profile->lock);
885 kfree(profile->data);
886 profile->data = NULL;
887 spin_unlock_bh(&profile->lock);
888}
889
890char *dasd_get_user_string(const char __user *user_buf, size_t user_len)
891{
892 char *buffer;
893
Stefan Weinhubere4258d52011-08-03 16:44:20 +0200894 buffer = vmalloc(user_len + 1);
Stefan Weinhuber4fa52aa2011-07-24 10:48:32 +0200895 if (buffer == NULL)
896 return ERR_PTR(-ENOMEM);
897 if (copy_from_user(buffer, user_buf, user_len) != 0) {
Stefan Weinhubere4258d52011-08-03 16:44:20 +0200898 vfree(buffer);
Stefan Weinhuber4fa52aa2011-07-24 10:48:32 +0200899 return ERR_PTR(-EFAULT);
900 }
901 /* got the string, now strip linefeed. */
902 if (buffer[user_len - 1] == '\n')
903 buffer[user_len - 1] = 0;
904 else
905 buffer[user_len] = 0;
906 return buffer;
907}
908
909static ssize_t dasd_stats_write(struct file *file,
910 const char __user *user_buf,
911 size_t user_len, loff_t *pos)
912{
913 char *buffer, *str;
914 int rc;
915 struct seq_file *m = (struct seq_file *)file->private_data;
916 struct dasd_profile *prof = m->private;
917
918 if (user_len > 65536)
919 user_len = 65536;
920 buffer = dasd_get_user_string(user_buf, user_len);
921 if (IS_ERR(buffer))
922 return PTR_ERR(buffer);
923
924 str = skip_spaces(buffer);
925 rc = user_len;
926 if (strncmp(str, "reset", 5) == 0) {
927 dasd_profile_reset(prof);
928 } else if (strncmp(str, "on", 2) == 0) {
929 rc = dasd_profile_on(prof);
930 if (!rc)
931 rc = user_len;
932 } else if (strncmp(str, "off", 3) == 0) {
933 dasd_profile_off(prof);
934 } else
935 rc = -EINVAL;
Stefan Weinhubere4258d52011-08-03 16:44:20 +0200936 vfree(buffer);
Stefan Weinhuber4fa52aa2011-07-24 10:48:32 +0200937 return rc;
938}
939
940static void dasd_stats_array(struct seq_file *m, unsigned int *array)
941{
942 int i;
943
944 for (i = 0; i < 32; i++)
945 seq_printf(m, "%u ", array[i]);
946 seq_putc(m, '\n');
947}
948
949static void dasd_stats_seq_print(struct seq_file *m,
950 struct dasd_profile_info *data)
951{
952 seq_printf(m, "start_time %ld.%09ld\n",
953 data->starttod.tv_sec, data->starttod.tv_nsec);
954 seq_printf(m, "total_requests %u\n", data->dasd_io_reqs);
955 seq_printf(m, "total_sectors %u\n", data->dasd_io_sects);
956 seq_printf(m, "total_pav %u\n", data->dasd_io_alias);
957 seq_printf(m, "total_hpf %u\n", data->dasd_io_tpm);
958 seq_printf(m, "histogram_sectors ");
959 dasd_stats_array(m, data->dasd_io_secs);
960 seq_printf(m, "histogram_io_times ");
961 dasd_stats_array(m, data->dasd_io_times);
962 seq_printf(m, "histogram_io_times_weighted ");
963 dasd_stats_array(m, data->dasd_io_timps);
964 seq_printf(m, "histogram_time_build_to_ssch ");
965 dasd_stats_array(m, data->dasd_io_time1);
966 seq_printf(m, "histogram_time_ssch_to_irq ");
967 dasd_stats_array(m, data->dasd_io_time2);
968 seq_printf(m, "histogram_time_ssch_to_irq_weighted ");
969 dasd_stats_array(m, data->dasd_io_time2ps);
970 seq_printf(m, "histogram_time_irq_to_end ");
971 dasd_stats_array(m, data->dasd_io_time3);
972 seq_printf(m, "histogram_ccw_queue_length ");
973 dasd_stats_array(m, data->dasd_io_nr_req);
974 seq_printf(m, "total_read_requests %u\n", data->dasd_read_reqs);
975 seq_printf(m, "total_read_sectors %u\n", data->dasd_read_sects);
976 seq_printf(m, "total_read_pav %u\n", data->dasd_read_alias);
977 seq_printf(m, "total_read_hpf %u\n", data->dasd_read_tpm);
978 seq_printf(m, "histogram_read_sectors ");
979 dasd_stats_array(m, data->dasd_read_secs);
980 seq_printf(m, "histogram_read_times ");
981 dasd_stats_array(m, data->dasd_read_times);
982 seq_printf(m, "histogram_read_time_build_to_ssch ");
983 dasd_stats_array(m, data->dasd_read_time1);
984 seq_printf(m, "histogram_read_time_ssch_to_irq ");
985 dasd_stats_array(m, data->dasd_read_time2);
986 seq_printf(m, "histogram_read_time_irq_to_end ");
987 dasd_stats_array(m, data->dasd_read_time3);
988 seq_printf(m, "histogram_read_ccw_queue_length ");
989 dasd_stats_array(m, data->dasd_read_nr_req);
990}
991
992static int dasd_stats_show(struct seq_file *m, void *v)
993{
994 struct dasd_profile *profile;
995 struct dasd_profile_info *data;
996
997 profile = m->private;
998 spin_lock_bh(&profile->lock);
999 data = profile->data;
1000 if (!data) {
1001 spin_unlock_bh(&profile->lock);
1002 seq_printf(m, "disabled\n");
1003 return 0;
1004 }
1005 dasd_stats_seq_print(m, data);
1006 spin_unlock_bh(&profile->lock);
1007 return 0;
1008}
1009
1010static int dasd_stats_open(struct inode *inode, struct file *file)
1011{
1012 struct dasd_profile *profile = inode->i_private;
1013 return single_open(file, dasd_stats_show, profile);
1014}
1015
1016static const struct file_operations dasd_stats_raw_fops = {
1017 .owner = THIS_MODULE,
1018 .open = dasd_stats_open,
1019 .read = seq_read,
1020 .llseek = seq_lseek,
1021 .release = single_release,
1022 .write = dasd_stats_write,
1023};
1024
1025static ssize_t dasd_stats_global_write(struct file *file,
1026 const char __user *user_buf,
1027 size_t user_len, loff_t *pos)
1028{
1029 char *buffer, *str;
1030 ssize_t rc;
1031
1032 if (user_len > 65536)
1033 user_len = 65536;
1034 buffer = dasd_get_user_string(user_buf, user_len);
1035 if (IS_ERR(buffer))
1036 return PTR_ERR(buffer);
1037 str = skip_spaces(buffer);
1038 rc = user_len;
1039 if (strncmp(str, "reset", 5) == 0) {
1040 dasd_global_profile_reset();
1041 } else if (strncmp(str, "on", 2) == 0) {
1042 dasd_global_profile_reset();
1043 dasd_global_profile_level = DASD_PROFILE_GLOBAL_ONLY;
1044 } else if (strncmp(str, "off", 3) == 0) {
1045 dasd_global_profile_level = DASD_PROFILE_OFF;
1046 } else
1047 rc = -EINVAL;
Stefan Weinhubere4258d52011-08-03 16:44:20 +02001048 vfree(buffer);
Stefan Weinhuber4fa52aa2011-07-24 10:48:32 +02001049 return rc;
1050}
1051
1052static int dasd_stats_global_show(struct seq_file *m, void *v)
1053{
1054 if (!dasd_global_profile_level) {
1055 seq_printf(m, "disabled\n");
1056 return 0;
1057 }
1058 dasd_stats_seq_print(m, &dasd_global_profile_data);
1059 return 0;
1060}
1061
1062static int dasd_stats_global_open(struct inode *inode, struct file *file)
1063{
1064 return single_open(file, dasd_stats_global_show, NULL);
1065}
1066
1067static const struct file_operations dasd_stats_global_fops = {
1068 .owner = THIS_MODULE,
1069 .open = dasd_stats_global_open,
1070 .read = seq_read,
1071 .llseek = seq_lseek,
1072 .release = single_release,
1073 .write = dasd_stats_global_write,
1074};
1075
1076static void dasd_profile_init(struct dasd_profile *profile,
1077 struct dentry *base_dentry)
1078{
Al Virof4ae40a2011-07-24 04:33:43 -04001079 umode_t mode;
Stefan Weinhuber4fa52aa2011-07-24 10:48:32 +02001080 struct dentry *pde;
1081
1082 if (!base_dentry)
1083 return;
1084 profile->dentry = NULL;
1085 profile->data = NULL;
1086 mode = (S_IRUSR | S_IWUSR | S_IFREG);
1087 pde = debugfs_create_file("statistics", mode, base_dentry,
1088 profile, &dasd_stats_raw_fops);
1089 if (pde && !IS_ERR(pde))
1090 profile->dentry = pde;
1091 return;
1092}
1093
1094static void dasd_profile_exit(struct dasd_profile *profile)
1095{
1096 dasd_profile_off(profile);
1097 if (profile->dentry) {
1098 debugfs_remove(profile->dentry);
1099 profile->dentry = NULL;
1100 }
1101}
1102
1103static void dasd_statistics_removeroot(void)
1104{
1105 dasd_global_profile_level = DASD_PROFILE_OFF;
1106 if (dasd_global_profile_dentry) {
1107 debugfs_remove(dasd_global_profile_dentry);
1108 dasd_global_profile_dentry = NULL;
1109 }
1110 if (dasd_debugfs_global_entry)
1111 debugfs_remove(dasd_debugfs_global_entry);
1112 if (dasd_debugfs_root_entry)
1113 debugfs_remove(dasd_debugfs_root_entry);
1114}
1115
1116static void dasd_statistics_createroot(void)
1117{
Al Virof4ae40a2011-07-24 04:33:43 -04001118 umode_t mode;
Stefan Weinhuber4fa52aa2011-07-24 10:48:32 +02001119 struct dentry *pde;
1120
1121 dasd_debugfs_root_entry = NULL;
1122 dasd_debugfs_global_entry = NULL;
1123 dasd_global_profile_dentry = NULL;
1124 pde = debugfs_create_dir("dasd", NULL);
1125 if (!pde || IS_ERR(pde))
1126 goto error;
1127 dasd_debugfs_root_entry = pde;
1128 pde = debugfs_create_dir("global", dasd_debugfs_root_entry);
1129 if (!pde || IS_ERR(pde))
1130 goto error;
1131 dasd_debugfs_global_entry = pde;
1132
1133 mode = (S_IRUSR | S_IWUSR | S_IFREG);
1134 pde = debugfs_create_file("statistics", mode, dasd_debugfs_global_entry,
1135 NULL, &dasd_stats_global_fops);
1136 if (!pde || IS_ERR(pde))
1137 goto error;
1138 dasd_global_profile_dentry = pde;
1139 return;
1140
1141error:
1142 DBF_EVENT(DBF_ERR, "%s",
1143 "Creation of the dasd debugfs interface failed");
1144 dasd_statistics_removeroot();
1145 return;
1146}
1147
Linus Torvalds1da177e2005-04-16 15:20:36 -07001148#else
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001149#define dasd_profile_start(block, cqr, req) do {} while (0)
1150#define dasd_profile_end(block, cqr, req) do {} while (0)
Stefan Weinhuber4fa52aa2011-07-24 10:48:32 +02001151
1152static void dasd_statistics_createroot(void)
1153{
1154 return;
1155}
1156
1157static void dasd_statistics_removeroot(void)
1158{
1159 return;
1160}
1161
1162int dasd_stats_generic_show(struct seq_file *m, void *v)
1163{
1164 seq_printf(m, "Statistics are not activated in this kernel\n");
1165 return 0;
1166}
1167
1168static void dasd_profile_init(struct dasd_profile *profile,
1169 struct dentry *base_dentry)
1170{
1171 return;
1172}
1173
1174static void dasd_profile_exit(struct dasd_profile *profile)
1175{
1176 return;
1177}
1178
1179int dasd_profile_on(struct dasd_profile *profile)
1180{
1181 return 0;
1182}
1183
Linus Torvalds1da177e2005-04-16 15:20:36 -07001184#endif /* CONFIG_DASD_PROFILE */
1185
1186/*
1187 * Allocate memory for a channel program with 'cplength' channel
1188 * command words and 'datasize' additional space. There are two
1189 * variantes: 1) dasd_kmalloc_request uses kmalloc to get the needed
1190 * memory and 2) dasd_smalloc_request uses the static ccw memory
1191 * that gets allocated for each device.
1192 */
Stefan Haberland68b781f2009-09-11 10:28:29 +02001193struct dasd_ccw_req *dasd_kmalloc_request(int magic, int cplength,
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001194 int datasize,
1195 struct dasd_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001196{
1197 struct dasd_ccw_req *cqr;
1198
1199 /* Sanity checks */
Stefan Haberland68b781f2009-09-11 10:28:29 +02001200 BUG_ON(datasize > PAGE_SIZE ||
Eric Sesterhenn7ac1e872006-03-24 18:48:13 +01001201 (cplength*sizeof(struct ccw1)) > PAGE_SIZE);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001202
Eric Sesterhenn88abaab2006-03-24 03:15:31 -08001203 cqr = kzalloc(sizeof(struct dasd_ccw_req), GFP_ATOMIC);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001204 if (cqr == NULL)
1205 return ERR_PTR(-ENOMEM);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001206 cqr->cpaddr = NULL;
1207 if (cplength > 0) {
Eric Sesterhenn88abaab2006-03-24 03:15:31 -08001208 cqr->cpaddr = kcalloc(cplength, sizeof(struct ccw1),
Linus Torvalds1da177e2005-04-16 15:20:36 -07001209 GFP_ATOMIC | GFP_DMA);
1210 if (cqr->cpaddr == NULL) {
1211 kfree(cqr);
1212 return ERR_PTR(-ENOMEM);
1213 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001214 }
1215 cqr->data = NULL;
1216 if (datasize > 0) {
Eric Sesterhenn88abaab2006-03-24 03:15:31 -08001217 cqr->data = kzalloc(datasize, GFP_ATOMIC | GFP_DMA);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001218 if (cqr->data == NULL) {
Jesper Juhl17fd6822005-11-07 01:01:30 -08001219 kfree(cqr->cpaddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001220 kfree(cqr);
1221 return ERR_PTR(-ENOMEM);
1222 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001223 }
Stefan Haberland68b781f2009-09-11 10:28:29 +02001224 cqr->magic = magic;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001225 set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
1226 dasd_get_device(device);
1227 return cqr;
1228}
1229
Stefan Haberland68b781f2009-09-11 10:28:29 +02001230struct dasd_ccw_req *dasd_smalloc_request(int magic, int cplength,
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001231 int datasize,
1232 struct dasd_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001233{
1234 unsigned long flags;
1235 struct dasd_ccw_req *cqr;
1236 char *data;
1237 int size;
1238
Linus Torvalds1da177e2005-04-16 15:20:36 -07001239 size = (sizeof(struct dasd_ccw_req) + 7L) & -8L;
1240 if (cplength > 0)
1241 size += cplength * sizeof(struct ccw1);
1242 if (datasize > 0)
1243 size += datasize;
1244 spin_lock_irqsave(&device->mem_lock, flags);
1245 cqr = (struct dasd_ccw_req *)
1246 dasd_alloc_chunk(&device->ccw_chunks, size);
1247 spin_unlock_irqrestore(&device->mem_lock, flags);
1248 if (cqr == NULL)
1249 return ERR_PTR(-ENOMEM);
1250 memset(cqr, 0, sizeof(struct dasd_ccw_req));
1251 data = (char *) cqr + ((sizeof(struct dasd_ccw_req) + 7L) & -8L);
1252 cqr->cpaddr = NULL;
1253 if (cplength > 0) {
1254 cqr->cpaddr = (struct ccw1 *) data;
1255 data += cplength*sizeof(struct ccw1);
1256 memset(cqr->cpaddr, 0, cplength*sizeof(struct ccw1));
1257 }
1258 cqr->data = NULL;
1259 if (datasize > 0) {
1260 cqr->data = data;
1261 memset(cqr->data, 0, datasize);
1262 }
Stefan Haberland68b781f2009-09-11 10:28:29 +02001263 cqr->magic = magic;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001264 set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
1265 dasd_get_device(device);
1266 return cqr;
1267}
1268
1269/*
1270 * Free memory of a channel program. This function needs to free all the
1271 * idal lists that might have been created by dasd_set_cda and the
1272 * struct dasd_ccw_req itself.
1273 */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001274void dasd_kfree_request(struct dasd_ccw_req *cqr, struct dasd_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001275{
Martin Schwidefsky347a8dc2006-01-06 00:19:28 -08001276#ifdef CONFIG_64BIT
Linus Torvalds1da177e2005-04-16 15:20:36 -07001277 struct ccw1 *ccw;
1278
1279 /* Clear any idals used for the request. */
1280 ccw = cqr->cpaddr;
1281 do {
1282 clear_normalized_cda(ccw);
1283 } while (ccw++->flags & (CCW_FLAG_CC | CCW_FLAG_DC));
1284#endif
Jesper Juhl17fd6822005-11-07 01:01:30 -08001285 kfree(cqr->cpaddr);
1286 kfree(cqr->data);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001287 kfree(cqr);
1288 dasd_put_device(device);
1289}
1290
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001291void dasd_sfree_request(struct dasd_ccw_req *cqr, struct dasd_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001292{
1293 unsigned long flags;
1294
1295 spin_lock_irqsave(&device->mem_lock, flags);
1296 dasd_free_chunk(&device->ccw_chunks, cqr);
1297 spin_unlock_irqrestore(&device->mem_lock, flags);
1298 dasd_put_device(device);
1299}
1300
1301/*
1302 * Check discipline magic in cqr.
1303 */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001304static inline int dasd_check_cqr(struct dasd_ccw_req *cqr)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001305{
1306 struct dasd_device *device;
1307
1308 if (cqr == NULL)
1309 return -EINVAL;
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001310 device = cqr->startdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001311 if (strncmp((char *) &cqr->magic, device->discipline->ebcname, 4)) {
Stefan Haberlandfc19f382009-03-26 15:23:49 +01001312 DBF_DEV_EVENT(DBF_WARNING, device,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001313 " dasd_ccw_req 0x%08x magic doesn't match"
1314 " discipline 0x%08x",
1315 cqr->magic,
1316 *(unsigned int *) device->discipline->name);
1317 return -EINVAL;
1318 }
1319 return 0;
1320}
1321
1322/*
1323 * Terminate the current i/o and set the request to clear_pending.
1324 * Timer keeps device runnig.
1325 * ccw_device_clear can fail if the i/o subsystem
1326 * is in a bad mood.
1327 */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001328int dasd_term_IO(struct dasd_ccw_req *cqr)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001329{
1330 struct dasd_device *device;
1331 int retries, rc;
Stefan Haberlandfc19f382009-03-26 15:23:49 +01001332 char errorstring[ERRORLENGTH];
Linus Torvalds1da177e2005-04-16 15:20:36 -07001333
1334 /* Check the cqr */
1335 rc = dasd_check_cqr(cqr);
1336 if (rc)
1337 return rc;
1338 retries = 0;
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001339 device = (struct dasd_device *) cqr->startdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001340 while ((retries < 5) && (cqr->status == DASD_CQR_IN_IO)) {
1341 rc = ccw_device_clear(device->cdev, (long) cqr);
1342 switch (rc) {
1343 case 0: /* termination successful */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001344 cqr->status = DASD_CQR_CLEAR_PENDING;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001345 cqr->stopclk = get_clock();
Horst Hummel8f617012006-08-30 14:33:33 +02001346 cqr->starttime = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001347 DBF_DEV_EVENT(DBF_DEBUG, device,
1348 "terminate cqr %p successful",
1349 cqr);
1350 break;
1351 case -ENODEV:
1352 DBF_DEV_EVENT(DBF_ERR, device, "%s",
1353 "device gone, retry");
1354 break;
1355 case -EIO:
1356 DBF_DEV_EVENT(DBF_ERR, device, "%s",
1357 "I/O error, retry");
1358 break;
1359 case -EINVAL:
1360 case -EBUSY:
1361 DBF_DEV_EVENT(DBF_ERR, device, "%s",
1362 "device busy, retry later");
1363 break;
1364 default:
Stefan Haberlandfc19f382009-03-26 15:23:49 +01001365 /* internal error 10 - unknown rc*/
1366 snprintf(errorstring, ERRORLENGTH, "10 %d", rc);
1367 dev_err(&device->cdev->dev, "An error occurred in the "
1368 "DASD device driver, reason=%s\n", errorstring);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001369 BUG();
1370 break;
1371 }
1372 retries++;
1373 }
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001374 dasd_schedule_device_bh(device);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001375 return rc;
1376}
1377
1378/*
1379 * Start the i/o. This start_IO can fail if the channel is really busy.
1380 * In that case set up a timer to start the request later.
1381 */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001382int dasd_start_IO(struct dasd_ccw_req *cqr)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001383{
1384 struct dasd_device *device;
1385 int rc;
Stefan Haberlandfc19f382009-03-26 15:23:49 +01001386 char errorstring[ERRORLENGTH];
Linus Torvalds1da177e2005-04-16 15:20:36 -07001387
1388 /* Check the cqr */
1389 rc = dasd_check_cqr(cqr);
Stefan Weinhuber6cc7f162009-06-12 10:26:39 +02001390 if (rc) {
1391 cqr->intrc = rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001392 return rc;
Stefan Weinhuber6cc7f162009-06-12 10:26:39 +02001393 }
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001394 device = (struct dasd_device *) cqr->startdev;
Stefan Weinhuber5a27e602011-01-05 12:48:04 +01001395 if (((cqr->block &&
1396 test_bit(DASD_FLAG_LOCK_STOLEN, &cqr->block->base->flags)) ||
1397 test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags)) &&
1398 !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) {
1399 DBF_DEV_EVENT(DBF_DEBUG, device, "start_IO: return request %p "
1400 "because of stolen lock", cqr);
1401 cqr->status = DASD_CQR_ERROR;
1402 cqr->intrc = -EPERM;
1403 return -EPERM;
1404 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001405 if (cqr->retries < 0) {
Stefan Haberlandfc19f382009-03-26 15:23:49 +01001406 /* internal error 14 - start_IO run out of retries */
1407 sprintf(errorstring, "14 %p", cqr);
1408 dev_err(&device->cdev->dev, "An error occurred in the DASD "
1409 "device driver, reason=%s\n", errorstring);
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001410 cqr->status = DASD_CQR_ERROR;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001411 return -EIO;
1412 }
1413 cqr->startclk = get_clock();
1414 cqr->starttime = jiffies;
1415 cqr->retries--;
Stefan Weinhubera4d26c62011-01-05 12:48:03 +01001416 if (!test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags)) {
1417 cqr->lpm &= device->path_data.opm;
1418 if (!cqr->lpm)
1419 cqr->lpm = device->path_data.opm;
1420 }
Stefan Weinhuberf3eb5382009-03-26 15:23:48 +01001421 if (cqr->cpmode == 1) {
1422 rc = ccw_device_tm_start(device->cdev, cqr->cpaddr,
1423 (long) cqr, cqr->lpm);
1424 } else {
1425 rc = ccw_device_start(device->cdev, cqr->cpaddr,
1426 (long) cqr, cqr->lpm, 0);
1427 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001428 switch (rc) {
1429 case 0:
1430 cqr->status = DASD_CQR_IN_IO;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001431 break;
1432 case -EBUSY:
Stefan Weinhubera4d26c62011-01-05 12:48:03 +01001433 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
Linus Torvalds1da177e2005-04-16 15:20:36 -07001434 "start_IO: device busy, retry later");
1435 break;
1436 case -ETIMEDOUT:
Stefan Weinhubera4d26c62011-01-05 12:48:03 +01001437 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
Linus Torvalds1da177e2005-04-16 15:20:36 -07001438 "start_IO: request timeout, retry later");
1439 break;
1440 case -EACCES:
Stefan Weinhubera4d26c62011-01-05 12:48:03 +01001441 /* -EACCES indicates that the request used only a subset of the
1442 * available paths and all these paths are gone. If the lpm of
1443 * this request was only a subset of the opm (e.g. the ppm) then
1444 * we just do a retry with all available paths.
1445 * If we already use the full opm, something is amiss, and we
1446 * need a full path verification.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001447 */
Stefan Weinhubera4d26c62011-01-05 12:48:03 +01001448 if (test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags)) {
1449 DBF_DEV_EVENT(DBF_WARNING, device,
1450 "start_IO: selected paths gone (%x)",
1451 cqr->lpm);
1452 } else if (cqr->lpm != device->path_data.opm) {
1453 cqr->lpm = device->path_data.opm;
1454 DBF_DEV_EVENT(DBF_DEBUG, device, "%s",
1455 "start_IO: selected paths gone,"
1456 " retry on all paths");
1457 } else {
1458 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1459 "start_IO: all paths in opm gone,"
1460 " do path verification");
1461 dasd_generic_last_path_gone(device);
1462 device->path_data.opm = 0;
1463 device->path_data.ppm = 0;
1464 device->path_data.npm = 0;
1465 device->path_data.tbvpm =
1466 ccw_device_get_path_mask(device->cdev);
1467 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001468 break;
1469 case -ENODEV:
Stefan Weinhubera4d26c62011-01-05 12:48:03 +01001470 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
Stefan Weinhuberf3eb5382009-03-26 15:23:48 +01001471 "start_IO: -ENODEV device gone, retry");
1472 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001473 case -EIO:
Stefan Weinhubera4d26c62011-01-05 12:48:03 +01001474 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
Stefan Weinhuberf3eb5382009-03-26 15:23:48 +01001475 "start_IO: -EIO device gone, retry");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001476 break;
Stefan Haberlandd41dd122009-06-16 10:30:25 +02001477 case -EINVAL:
1478 /* most likely caused in power management context */
Stefan Weinhubera4d26c62011-01-05 12:48:03 +01001479 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
Stefan Haberlandd41dd122009-06-16 10:30:25 +02001480 "start_IO: -EINVAL device currently "
1481 "not accessible");
1482 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001483 default:
Stefan Haberlandfc19f382009-03-26 15:23:49 +01001484 /* internal error 11 - unknown rc */
1485 snprintf(errorstring, ERRORLENGTH, "11 %d", rc);
1486 dev_err(&device->cdev->dev,
1487 "An error occurred in the DASD device driver, "
1488 "reason=%s\n", errorstring);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001489 BUG();
1490 break;
1491 }
Stefan Weinhuber6cc7f162009-06-12 10:26:39 +02001492 cqr->intrc = rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001493 return rc;
1494}
1495
1496/*
1497 * Timeout function for dasd devices. This is used for different purposes
1498 * 1) missing interrupt handler for normal operation
1499 * 2) delayed start of request where start_IO failed with -EBUSY
1500 * 3) timeout for missing state change interrupts
1501 * The head of the ccw queue will have status DASD_CQR_IN_IO for 1),
1502 * DASD_CQR_QUEUED for 2) and 3).
1503 */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001504static void dasd_device_timeout(unsigned long ptr)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001505{
1506 unsigned long flags;
1507 struct dasd_device *device;
1508
1509 device = (struct dasd_device *) ptr;
1510 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
1511 /* re-activate request queue */
Stefan Weinhubereb6e1992009-12-07 12:51:51 +01001512 dasd_device_remove_stop_bits(device, DASD_STOPPED_PENDING);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001513 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001514 dasd_schedule_device_bh(device);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001515}
1516
1517/*
1518 * Setup timeout for a device in jiffies.
1519 */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001520void dasd_device_set_timer(struct dasd_device *device, int expires)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001521{
Stefan Weinhuber48cae882009-02-11 10:37:31 +01001522 if (expires == 0)
1523 del_timer(&device->timer);
1524 else
1525 mod_timer(&device->timer, jiffies + expires);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001526}
1527
1528/*
1529 * Clear timeout for a device.
1530 */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001531void dasd_device_clear_timer(struct dasd_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001532{
Stefan Weinhuber48cae882009-02-11 10:37:31 +01001533 del_timer(&device->timer);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001534}
1535
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001536static void dasd_handle_killed_request(struct ccw_device *cdev,
1537 unsigned long intparm)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001538{
1539 struct dasd_ccw_req *cqr;
1540 struct dasd_device *device;
1541
Stefan Weinhuberf16f5842008-05-15 16:52:36 +02001542 if (!intparm)
1543 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001544 cqr = (struct dasd_ccw_req *) intparm;
1545 if (cqr->status != DASD_CQR_IN_IO) {
Stefan Haberlandb8ed5dd2009-12-07 12:51:52 +01001546 DBF_EVENT_DEVID(DBF_DEBUG, cdev,
1547 "invalid status in handle_killed_request: "
1548 "%02x", cqr->status);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001549 return;
1550 }
1551
Stefan Haberland589c74d2010-02-26 22:37:47 +01001552 device = dasd_device_from_cdev_locked(cdev);
1553 if (IS_ERR(device)) {
1554 DBF_EVENT_DEVID(DBF_DEBUG, cdev, "%s",
1555 "unable to get device from cdev");
1556 return;
1557 }
1558
1559 if (!cqr->startdev ||
1560 device != cqr->startdev ||
1561 strncmp(cqr->startdev->discipline->ebcname,
1562 (char *) &cqr->magic, 4)) {
Stefan Haberland294001a2010-01-27 10:12:35 +01001563 DBF_EVENT_DEVID(DBF_DEBUG, cdev, "%s",
1564 "invalid device in request");
Stefan Haberland589c74d2010-02-26 22:37:47 +01001565 dasd_put_device(device);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001566 return;
1567 }
1568
1569 /* Schedule request to be retried. */
1570 cqr->status = DASD_CQR_QUEUED;
1571
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001572 dasd_device_clear_timer(device);
1573 dasd_schedule_device_bh(device);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001574 dasd_put_device(device);
1575}
1576
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001577void dasd_generic_handle_state_change(struct dasd_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001578{
Stefan Weinhuber20c64462006-03-24 03:15:25 -08001579 /* First of all start sense subsystem status request. */
1580 dasd_eer_snss(device);
1581
Stefan Weinhubereb6e1992009-12-07 12:51:51 +01001582 dasd_device_remove_stop_bits(device, DASD_STOPPED_PENDING);
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001583 dasd_schedule_device_bh(device);
1584 if (device->block)
1585 dasd_schedule_block_bh(device->block);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001586}
1587
1588/*
1589 * Interrupt handler for "normal" ssch-io based dasd devices.
1590 */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001591void dasd_int_handler(struct ccw_device *cdev, unsigned long intparm,
1592 struct irb *irb)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001593{
1594 struct dasd_ccw_req *cqr, *next;
1595 struct dasd_device *device;
1596 unsigned long long now;
1597 int expires;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001598
1599 if (IS_ERR(irb)) {
1600 switch (PTR_ERR(irb)) {
1601 case -EIO:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001602 break;
1603 case -ETIMEDOUT:
Stefan Haberlandb8ed5dd2009-12-07 12:51:52 +01001604 DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s: "
1605 "request timed out\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001606 break;
1607 default:
Stefan Haberlandb8ed5dd2009-12-07 12:51:52 +01001608 DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s: "
1609 "unknown error %ld\n", __func__,
1610 PTR_ERR(irb));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001611 }
Stefan Weinhuberf16f5842008-05-15 16:52:36 +02001612 dasd_handle_killed_request(cdev, intparm);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001613 return;
1614 }
1615
1616 now = get_clock();
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001617 cqr = (struct dasd_ccw_req *) intparm;
Stefan Weinhuber5a27e602011-01-05 12:48:04 +01001618 /* check for conditions that should be handled immediately */
1619 if (!cqr ||
1620 !(scsw_dstat(&irb->scsw) == (DEV_STAT_CHN_END | DEV_STAT_DEV_END) &&
1621 scsw_cstat(&irb->scsw) == 0)) {
Stefan Weinhubera5a00612010-10-25 16:10:47 +02001622 if (cqr)
1623 memcpy(&cqr->irb, irb, sizeof(*irb));
Martin Schwidefskya00bfd72006-09-20 15:59:05 +02001624 device = dasd_device_from_cdev_locked(cdev);
Stefan Haberland56b86b62010-10-25 16:10:49 +02001625 if (IS_ERR(device))
1626 return;
1627 /* ignore unsolicited interrupts for DIAG discipline */
1628 if (device->discipline == dasd_diag_discipline_pointer) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001629 dasd_put_device(device);
Stefan Haberland56b86b62010-10-25 16:10:49 +02001630 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001631 }
Stefan Weinhuber5a27e602011-01-05 12:48:04 +01001632 device->discipline->dump_sense_dbf(device, irb, "int");
1633 if (device->features & DASD_FEATURE_ERPLOG)
1634 device->discipline->dump_sense(device, cqr, irb);
1635 device->discipline->check_for_device_change(device, cqr, irb);
Stefan Haberland56b86b62010-10-25 16:10:49 +02001636 dasd_put_device(device);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001637 }
Stefan Weinhuber5a27e602011-01-05 12:48:04 +01001638 if (!cqr)
1639 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001640
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001641 device = (struct dasd_device *) cqr->startdev;
1642 if (!device ||
Linus Torvalds1da177e2005-04-16 15:20:36 -07001643 strncmp(device->discipline->ebcname, (char *) &cqr->magic, 4)) {
Stefan Haberland294001a2010-01-27 10:12:35 +01001644 DBF_EVENT_DEVID(DBF_DEBUG, cdev, "%s",
1645 "invalid device in request");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001646 return;
1647 }
1648
1649 /* Check for clear pending */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001650 if (cqr->status == DASD_CQR_CLEAR_PENDING &&
Stefan Weinhuberf3eb5382009-03-26 15:23:48 +01001651 scsw_fctl(&irb->scsw) & SCSW_FCTL_CLEAR_FUNC) {
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001652 cqr->status = DASD_CQR_CLEARED;
1653 dasd_device_clear_timer(device);
Horst Hummel8f617012006-08-30 14:33:33 +02001654 wake_up(&dasd_flush_wq);
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001655 dasd_schedule_device_bh(device);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001656 return;
1657 }
1658
Stefan Weinhuberf3eb5382009-03-26 15:23:48 +01001659 /* check status - the request might have been killed by dyn detach */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001660 if (cqr->status != DASD_CQR_IN_IO) {
Stefan Haberlandfc19f382009-03-26 15:23:49 +01001661 DBF_DEV_EVENT(DBF_DEBUG, device, "invalid status: bus_id %s, "
1662 "status %02x", dev_name(&cdev->dev), cqr->status);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001663 return;
1664 }
Stefan Haberlandfc19f382009-03-26 15:23:49 +01001665
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001666 next = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001667 expires = 0;
Stefan Weinhuberf3eb5382009-03-26 15:23:48 +01001668 if (scsw_dstat(&irb->scsw) == (DEV_STAT_CHN_END | DEV_STAT_DEV_END) &&
1669 scsw_cstat(&irb->scsw) == 0) {
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001670 /* request was completed successfully */
1671 cqr->status = DASD_CQR_SUCCESS;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001672 cqr->stopclk = now;
1673 /* Start first request on queue if possible -> fast_io. */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001674 if (cqr->devlist.next != &device->ccw_queue) {
1675 next = list_entry(cqr->devlist.next,
1676 struct dasd_ccw_req, devlist);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001677 }
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001678 } else { /* error */
Stefan Haberland6c5f57c2008-02-05 16:50:46 +01001679 /*
1680 * If we don't want complex ERP for this request, then just
1681 * reset this and retry it in the fastpath
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001682 */
Stefan Haberland6c5f57c2008-02-05 16:50:46 +01001683 if (!test_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags) &&
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001684 cqr->retries > 0) {
Stefan Weinhubera4d26c62011-01-05 12:48:03 +01001685 if (cqr->lpm == device->path_data.opm)
Stefan Haberlandfc19f382009-03-26 15:23:49 +01001686 DBF_DEV_EVENT(DBF_DEBUG, device,
1687 "default ERP in fastpath "
1688 "(%i retries left)",
1689 cqr->retries);
Stefan Weinhubera4d26c62011-01-05 12:48:03 +01001690 if (!test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags))
1691 cqr->lpm = device->path_data.opm;
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001692 cqr->status = DASD_CQR_QUEUED;
1693 next = cqr;
1694 } else
Linus Torvalds1da177e2005-04-16 15:20:36 -07001695 cqr->status = DASD_CQR_ERROR;
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001696 }
1697 if (next && (next->status == DASD_CQR_QUEUED) &&
1698 (!device->stopped)) {
1699 if (device->discipline->start_IO(next) == 0)
1700 expires = next->expires;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001701 }
1702 if (expires != 0)
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001703 dasd_device_set_timer(device, expires);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001704 else
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001705 dasd_device_clear_timer(device);
1706 dasd_schedule_device_bh(device);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001707}
1708
Stefan Haberlanda23ed002010-05-26 23:27:09 +02001709enum uc_todo dasd_generic_uc_handler(struct ccw_device *cdev, struct irb *irb)
1710{
1711 struct dasd_device *device;
1712
1713 device = dasd_device_from_cdev_locked(cdev);
1714
1715 if (IS_ERR(device))
1716 goto out;
1717 if (test_bit(DASD_FLAG_OFFLINE, &device->flags) ||
1718 device->state != device->target ||
Stefan Weinhuber5a27e602011-01-05 12:48:04 +01001719 !device->discipline->check_for_device_change){
Stefan Haberlanda23ed002010-05-26 23:27:09 +02001720 dasd_put_device(device);
1721 goto out;
1722 }
Stefan Weinhuber5a27e602011-01-05 12:48:04 +01001723 if (device->discipline->dump_sense_dbf)
1724 device->discipline->dump_sense_dbf(device, irb, "uc");
1725 device->discipline->check_for_device_change(device, NULL, irb);
Stefan Haberlanda23ed002010-05-26 23:27:09 +02001726 dasd_put_device(device);
1727out:
1728 return UC_TODO_RETRY;
1729}
1730EXPORT_SYMBOL_GPL(dasd_generic_uc_handler);
1731
Linus Torvalds1da177e2005-04-16 15:20:36 -07001732/*
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001733 * If we have an error on a dasd_block layer request then we cancel
1734 * and return all further requests from the same dasd_block as well.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001735 */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001736static void __dasd_device_recovery(struct dasd_device *device,
1737 struct dasd_ccw_req *ref_cqr)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001738{
1739 struct list_head *l, *n;
1740 struct dasd_ccw_req *cqr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001741
1742 /*
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001743 * only requeue request that came from the dasd_block layer
Linus Torvalds1da177e2005-04-16 15:20:36 -07001744 */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001745 if (!ref_cqr->block)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001746 return;
Horst Hummelf24acd42005-05-01 08:58:59 -07001747
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001748 list_for_each_safe(l, n, &device->ccw_queue) {
1749 cqr = list_entry(l, struct dasd_ccw_req, devlist);
1750 if (cqr->status == DASD_CQR_QUEUED &&
1751 ref_cqr->block == cqr->block) {
1752 cqr->status = DASD_CQR_CLEARED;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001753 }
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001754 }
1755};
1756
1757/*
1758 * Remove those ccw requests from the queue that need to be returned
1759 * to the upper layer.
1760 */
1761static void __dasd_device_process_ccw_queue(struct dasd_device *device,
1762 struct list_head *final_queue)
1763{
1764 struct list_head *l, *n;
1765 struct dasd_ccw_req *cqr;
1766
1767 /* Process request with final status. */
1768 list_for_each_safe(l, n, &device->ccw_queue) {
1769 cqr = list_entry(l, struct dasd_ccw_req, devlist);
1770
1771 /* Stop list processing at the first non-final request. */
1772 if (cqr->status == DASD_CQR_QUEUED ||
1773 cqr->status == DASD_CQR_IN_IO ||
1774 cqr->status == DASD_CQR_CLEAR_PENDING)
1775 break;
1776 if (cqr->status == DASD_CQR_ERROR) {
1777 __dasd_device_recovery(device, cqr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001778 }
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001779 /* Rechain finished requests to final queue */
1780 list_move_tail(&cqr->devlist, final_queue);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001781 }
1782}
1783
1784/*
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001785 * the cqrs from the final queue are returned to the upper layer
1786 * by setting a dasd_block state and calling the callback function
1787 */
1788static void __dasd_device_process_final_queue(struct dasd_device *device,
1789 struct list_head *final_queue)
1790{
1791 struct list_head *l, *n;
1792 struct dasd_ccw_req *cqr;
Stefan Weinhuber03513bc2008-02-19 15:29:27 +01001793 struct dasd_block *block;
Stefan Haberlandc80ee722008-05-30 10:03:31 +02001794 void (*callback)(struct dasd_ccw_req *, void *data);
1795 void *callback_data;
Stefan Haberlandfc19f382009-03-26 15:23:49 +01001796 char errorstring[ERRORLENGTH];
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001797
1798 list_for_each_safe(l, n, final_queue) {
1799 cqr = list_entry(l, struct dasd_ccw_req, devlist);
1800 list_del_init(&cqr->devlist);
Stefan Weinhuber03513bc2008-02-19 15:29:27 +01001801 block = cqr->block;
Stefan Haberlandc80ee722008-05-30 10:03:31 +02001802 callback = cqr->callback;
1803 callback_data = cqr->callback_data;
Stefan Weinhuber03513bc2008-02-19 15:29:27 +01001804 if (block)
1805 spin_lock_bh(&block->queue_lock);
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001806 switch (cqr->status) {
1807 case DASD_CQR_SUCCESS:
1808 cqr->status = DASD_CQR_DONE;
1809 break;
1810 case DASD_CQR_ERROR:
1811 cqr->status = DASD_CQR_NEED_ERP;
1812 break;
1813 case DASD_CQR_CLEARED:
1814 cqr->status = DASD_CQR_TERMINATED;
1815 break;
1816 default:
Stefan Haberlandfc19f382009-03-26 15:23:49 +01001817 /* internal error 12 - wrong cqr status*/
1818 snprintf(errorstring, ERRORLENGTH, "12 %p %x02", cqr, cqr->status);
1819 dev_err(&device->cdev->dev,
1820 "An error occurred in the DASD device driver, "
1821 "reason=%s\n", errorstring);
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001822 BUG();
1823 }
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001824 if (cqr->callback != NULL)
Stefan Haberlandc80ee722008-05-30 10:03:31 +02001825 (callback)(cqr, callback_data);
Stefan Weinhuber03513bc2008-02-19 15:29:27 +01001826 if (block)
1827 spin_unlock_bh(&block->queue_lock);
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001828 }
1829}
1830
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001831/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07001832 * Take a look at the first request on the ccw queue and check
1833 * if it reached its expire time. If so, terminate the IO.
1834 */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001835static void __dasd_device_check_expire(struct dasd_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001836{
1837 struct dasd_ccw_req *cqr;
1838
1839 if (list_empty(&device->ccw_queue))
1840 return;
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001841 cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist);
Horst Hummel29145a62006-12-04 15:40:15 +01001842 if ((cqr->status == DASD_CQR_IN_IO && cqr->expires != 0) &&
1843 (time_after_eq(jiffies, cqr->expires + cqr->starttime))) {
1844 if (device->discipline->term_IO(cqr) != 0) {
1845 /* Hmpf, try again in 5 sec */
Stefan Haberlandfc19f382009-03-26 15:23:49 +01001846 dev_err(&device->cdev->dev,
Heiko Carstens625c94d2010-08-13 10:06:38 +02001847 "cqr %p timed out (%lus) but cannot be "
Stefan Haberlandfc19f382009-03-26 15:23:49 +01001848 "ended, retrying in 5 s\n",
1849 cqr, (cqr->expires/HZ));
Stefan Haberland7dc1da92008-01-26 14:11:26 +01001850 cqr->expires += 5*HZ;
1851 dasd_device_set_timer(device, 5*HZ);
Horst Hummel29145a62006-12-04 15:40:15 +01001852 } else {
Stefan Haberlandfc19f382009-03-26 15:23:49 +01001853 dev_err(&device->cdev->dev,
Heiko Carstens625c94d2010-08-13 10:06:38 +02001854 "cqr %p timed out (%lus), %i retries "
Stefan Haberlandfc19f382009-03-26 15:23:49 +01001855 "remaining\n", cqr, (cqr->expires/HZ),
1856 cqr->retries);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001857 }
1858 }
1859}
1860
1861/*
1862 * Take a look at the first request on the ccw queue and check
1863 * if it needs to be started.
1864 */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001865static void __dasd_device_start_head(struct dasd_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001866{
1867 struct dasd_ccw_req *cqr;
1868 int rc;
1869
1870 if (list_empty(&device->ccw_queue))
1871 return;
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001872 cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist);
Peter Oberparleiter25ee4cf2006-04-10 22:53:47 -07001873 if (cqr->status != DASD_CQR_QUEUED)
1874 return;
Stefan Weinhubera4d26c62011-01-05 12:48:03 +01001875 /* when device is stopped, return request to previous layer
1876 * exception: only the disconnect or unresumed bits are set and the
1877 * cqr is a path verification request
1878 */
1879 if (device->stopped &&
1880 !(!(device->stopped & ~(DASD_STOPPED_DC_WAIT | DASD_UNRESUMED_PM))
1881 && test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags))) {
1882 cqr->intrc = -EAGAIN;
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001883 cqr->status = DASD_CQR_CLEARED;
1884 dasd_schedule_device_bh(device);
Peter Oberparleiter25ee4cf2006-04-10 22:53:47 -07001885 return;
Horst Hummel1c01b8a2006-01-06 00:19:15 -08001886 }
Peter Oberparleiter25ee4cf2006-04-10 22:53:47 -07001887
1888 rc = device->discipline->start_IO(cqr);
1889 if (rc == 0)
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001890 dasd_device_set_timer(device, cqr->expires);
Peter Oberparleiter25ee4cf2006-04-10 22:53:47 -07001891 else if (rc == -EACCES) {
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001892 dasd_schedule_device_bh(device);
Peter Oberparleiter25ee4cf2006-04-10 22:53:47 -07001893 } else
1894 /* Hmpf, try again in 1/2 sec */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001895 dasd_device_set_timer(device, 50);
Horst Hummel8f617012006-08-30 14:33:33 +02001896}
1897
Stefan Weinhubera4d26c62011-01-05 12:48:03 +01001898static void __dasd_device_check_path_events(struct dasd_device *device)
1899{
1900 int rc;
1901
1902 if (device->path_data.tbvpm) {
1903 if (device->stopped & ~(DASD_STOPPED_DC_WAIT |
1904 DASD_UNRESUMED_PM))
1905 return;
1906 rc = device->discipline->verify_path(
1907 device, device->path_data.tbvpm);
1908 if (rc)
1909 dasd_device_set_timer(device, 50);
1910 else
1911 device->path_data.tbvpm = 0;
1912 }
1913};
1914
Linus Torvalds1da177e2005-04-16 15:20:36 -07001915/*
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001916 * Go through all request on the dasd_device request queue,
1917 * terminate them on the cdev if necessary, and return them to the
1918 * submitting layer via callback.
1919 * Note:
1920 * Make sure that all 'submitting layers' still exist when
1921 * this function is called!. In other words, when 'device' is a base
1922 * device then all block layer requests must have been removed before
1923 * via dasd_flush_block_queue.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001924 */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001925int dasd_flush_device_queue(struct dasd_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001926{
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001927 struct dasd_ccw_req *cqr, *n;
1928 int rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001929 struct list_head flush_queue;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001930
1931 INIT_LIST_HEAD(&flush_queue);
1932 spin_lock_irq(get_ccwdev_lock(device->cdev));
Horst Hummel8f617012006-08-30 14:33:33 +02001933 rc = 0;
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001934 list_for_each_entry_safe(cqr, n, &device->ccw_queue, devlist) {
Horst Hummel8f617012006-08-30 14:33:33 +02001935 /* Check status and move request to flush_queue */
1936 switch (cqr->status) {
1937 case DASD_CQR_IN_IO:
1938 rc = device->discipline->term_IO(cqr);
1939 if (rc) {
1940 /* unable to terminate requeust */
Stefan Haberlandfc19f382009-03-26 15:23:49 +01001941 dev_err(&device->cdev->dev,
1942 "Flushing the DASD request queue "
1943 "failed for request %p\n", cqr);
Horst Hummel8f617012006-08-30 14:33:33 +02001944 /* stop flush processing */
1945 goto finished;
1946 }
1947 break;
1948 case DASD_CQR_QUEUED:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001949 cqr->stopclk = get_clock();
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001950 cqr->status = DASD_CQR_CLEARED;
Horst Hummel8f617012006-08-30 14:33:33 +02001951 break;
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001952 default: /* no need to modify the others */
Horst Hummel8f617012006-08-30 14:33:33 +02001953 break;
1954 }
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001955 list_move_tail(&cqr->devlist, &flush_queue);
Horst Hummel8f617012006-08-30 14:33:33 +02001956 }
Horst Hummel8f617012006-08-30 14:33:33 +02001957finished:
1958 spin_unlock_irq(get_ccwdev_lock(device->cdev));
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001959 /*
1960 * After this point all requests must be in state CLEAR_PENDING,
1961 * CLEARED, SUCCESS or ERROR. Now wait for CLEAR_PENDING to become
1962 * one of the others.
1963 */
1964 list_for_each_entry_safe(cqr, n, &flush_queue, devlist)
1965 wait_event(dasd_flush_wq,
1966 (cqr->status != DASD_CQR_CLEAR_PENDING));
1967 /*
1968 * Now set each request back to TERMINATED, DONE or NEED_ERP
1969 * and call the callback function of flushed requests
1970 */
1971 __dasd_device_process_final_queue(device, &flush_queue);
Horst Hummel8f617012006-08-30 14:33:33 +02001972 return rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001973}
1974
1975/*
1976 * Acquire the device lock and process queues for the device.
1977 */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001978static void dasd_device_tasklet(struct dasd_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001979{
1980 struct list_head final_queue;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001981
1982 atomic_set (&device->tasklet_scheduled, 0);
1983 INIT_LIST_HEAD(&final_queue);
1984 spin_lock_irq(get_ccwdev_lock(device->cdev));
1985 /* Check expire time of first request on the ccw queue. */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001986 __dasd_device_check_expire(device);
1987 /* find final requests on ccw queue */
1988 __dasd_device_process_ccw_queue(device, &final_queue);
Stefan Weinhubera4d26c62011-01-05 12:48:03 +01001989 __dasd_device_check_path_events(device);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001990 spin_unlock_irq(get_ccwdev_lock(device->cdev));
1991 /* Now call the callback function of requests with final status */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001992 __dasd_device_process_final_queue(device, &final_queue);
1993 spin_lock_irq(get_ccwdev_lock(device->cdev));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001994 /* Now check if the head of the ccw queue needs to be started. */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01001995 __dasd_device_start_head(device);
1996 spin_unlock_irq(get_ccwdev_lock(device->cdev));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001997 dasd_put_device(device);
1998}
1999
2000/*
2001 * Schedules a call to dasd_tasklet over the device tasklet.
2002 */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002003void dasd_schedule_device_bh(struct dasd_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002004{
2005 /* Protect against rescheduling. */
Martin Schwidefsky973bd992006-01-06 00:19:07 -08002006 if (atomic_cmpxchg (&device->tasklet_scheduled, 0, 1) != 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002007 return;
2008 dasd_get_device(device);
2009 tasklet_hi_schedule(&device->tasklet);
2010}
2011
Stefan Weinhubereb6e1992009-12-07 12:51:51 +01002012void dasd_device_set_stop_bits(struct dasd_device *device, int bits)
2013{
2014 device->stopped |= bits;
2015}
2016EXPORT_SYMBOL_GPL(dasd_device_set_stop_bits);
2017
2018void dasd_device_remove_stop_bits(struct dasd_device *device, int bits)
2019{
2020 device->stopped &= ~bits;
2021 if (!device->stopped)
2022 wake_up(&generic_waitq);
2023}
2024EXPORT_SYMBOL_GPL(dasd_device_remove_stop_bits);
2025
Linus Torvalds1da177e2005-04-16 15:20:36 -07002026/*
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002027 * Queue a request to the head of the device ccw_queue.
2028 * Start the I/O if possible.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002029 */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002030void dasd_add_request_head(struct dasd_ccw_req *cqr)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002031{
2032 struct dasd_device *device;
2033 unsigned long flags;
2034
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002035 device = cqr->startdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002036 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002037 cqr->status = DASD_CQR_QUEUED;
2038 list_add(&cqr->devlist, &device->ccw_queue);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002039 /* let the bh start the request to keep them in order */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002040 dasd_schedule_device_bh(device);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002041 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
2042}
2043
2044/*
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002045 * Queue a request to the tail of the device ccw_queue.
2046 * Start the I/O if possible.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002047 */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002048void dasd_add_request_tail(struct dasd_ccw_req *cqr)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002049{
2050 struct dasd_device *device;
2051 unsigned long flags;
2052
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002053 device = cqr->startdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002054 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002055 cqr->status = DASD_CQR_QUEUED;
2056 list_add_tail(&cqr->devlist, &device->ccw_queue);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002057 /* let the bh start the request to keep them in order */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002058 dasd_schedule_device_bh(device);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002059 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
2060}
2061
2062/*
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002063 * Wakeup helper for the 'sleep_on' functions.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002064 */
Stefan Haberland5915a872011-10-30 15:16:57 +01002065void dasd_wakeup_cb(struct dasd_ccw_req *cqr, void *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002066{
Stefan Weinhuber1c1e0932010-05-12 09:32:11 +02002067 spin_lock_irq(get_ccwdev_lock(cqr->startdev->cdev));
2068 cqr->callback_data = DASD_SLEEPON_END_TAG;
2069 spin_unlock_irq(get_ccwdev_lock(cqr->startdev->cdev));
2070 wake_up(&generic_waitq);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002071}
Stefan Haberland5915a872011-10-30 15:16:57 +01002072EXPORT_SYMBOL_GPL(dasd_wakeup_cb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002073
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002074static inline int _wait_for_wakeup(struct dasd_ccw_req *cqr)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002075{
2076 struct dasd_device *device;
2077 int rc;
2078
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002079 device = cqr->startdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002080 spin_lock_irq(get_ccwdev_lock(device->cdev));
Stefan Weinhuber1c1e0932010-05-12 09:32:11 +02002081 rc = (cqr->callback_data == DASD_SLEEPON_END_TAG);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002082 spin_unlock_irq(get_ccwdev_lock(device->cdev));
2083 return rc;
2084}
2085
2086/*
Stefan Weinhubereb6e1992009-12-07 12:51:51 +01002087 * checks if error recovery is necessary, returns 1 if yes, 0 otherwise.
2088 */
2089static int __dasd_sleep_on_erp(struct dasd_ccw_req *cqr)
2090{
2091 struct dasd_device *device;
2092 dasd_erp_fn_t erp_fn;
2093
2094 if (cqr->status == DASD_CQR_FILLED)
2095 return 0;
2096 device = cqr->startdev;
2097 if (test_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags)) {
2098 if (cqr->status == DASD_CQR_TERMINATED) {
2099 device->discipline->handle_terminated_request(cqr);
2100 return 1;
2101 }
2102 if (cqr->status == DASD_CQR_NEED_ERP) {
2103 erp_fn = device->discipline->erp_action(cqr);
2104 erp_fn(cqr);
2105 return 1;
2106 }
2107 if (cqr->status == DASD_CQR_FAILED)
2108 dasd_log_sense(cqr, &cqr->irb);
2109 if (cqr->refers) {
2110 __dasd_process_erp(device, cqr);
2111 return 1;
2112 }
2113 }
2114 return 0;
2115}
2116
2117static int __dasd_sleep_on_loop_condition(struct dasd_ccw_req *cqr)
2118{
2119 if (test_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags)) {
2120 if (cqr->refers) /* erp is not done yet */
2121 return 1;
2122 return ((cqr->status != DASD_CQR_DONE) &&
2123 (cqr->status != DASD_CQR_FAILED));
2124 } else
2125 return (cqr->status == DASD_CQR_FILLED);
2126}
2127
2128static int _dasd_sleep_on(struct dasd_ccw_req *maincqr, int interruptible)
2129{
2130 struct dasd_device *device;
2131 int rc;
2132 struct list_head ccw_queue;
2133 struct dasd_ccw_req *cqr;
2134
2135 INIT_LIST_HEAD(&ccw_queue);
2136 maincqr->status = DASD_CQR_FILLED;
2137 device = maincqr->startdev;
2138 list_add(&maincqr->blocklist, &ccw_queue);
2139 for (cqr = maincqr; __dasd_sleep_on_loop_condition(cqr);
2140 cqr = list_first_entry(&ccw_queue,
2141 struct dasd_ccw_req, blocklist)) {
2142
2143 if (__dasd_sleep_on_erp(cqr))
2144 continue;
2145 if (cqr->status != DASD_CQR_FILLED) /* could be failed */
2146 continue;
Stefan Weinhuber5a27e602011-01-05 12:48:04 +01002147 if (test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags) &&
2148 !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) {
2149 cqr->status = DASD_CQR_FAILED;
2150 cqr->intrc = -EPERM;
2151 continue;
2152 }
Stefan Weinhubereb6e1992009-12-07 12:51:51 +01002153 /* Non-temporary stop condition will trigger fail fast */
2154 if (device->stopped & ~DASD_STOPPED_PENDING &&
2155 test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags) &&
2156 (!dasd_eer_enabled(device))) {
2157 cqr->status = DASD_CQR_FAILED;
2158 continue;
2159 }
Stefan Weinhubereb6e1992009-12-07 12:51:51 +01002160 /* Don't try to start requests if device is stopped */
2161 if (interruptible) {
2162 rc = wait_event_interruptible(
2163 generic_waitq, !(device->stopped));
2164 if (rc == -ERESTARTSYS) {
2165 cqr->status = DASD_CQR_FAILED;
2166 maincqr->intrc = rc;
2167 continue;
2168 }
2169 } else
2170 wait_event(generic_waitq, !(device->stopped));
2171
Stefan Haberland5915a872011-10-30 15:16:57 +01002172 if (!cqr->callback)
2173 cqr->callback = dasd_wakeup_cb;
2174
Stefan Weinhuber1c1e0932010-05-12 09:32:11 +02002175 cqr->callback_data = DASD_SLEEPON_START_TAG;
Stefan Weinhubereb6e1992009-12-07 12:51:51 +01002176 dasd_add_request_tail(cqr);
2177 if (interruptible) {
2178 rc = wait_event_interruptible(
2179 generic_waitq, _wait_for_wakeup(cqr));
2180 if (rc == -ERESTARTSYS) {
2181 dasd_cancel_req(cqr);
2182 /* wait (non-interruptible) for final status */
2183 wait_event(generic_waitq,
2184 _wait_for_wakeup(cqr));
2185 cqr->status = DASD_CQR_FAILED;
2186 maincqr->intrc = rc;
2187 continue;
2188 }
2189 } else
2190 wait_event(generic_waitq, _wait_for_wakeup(cqr));
2191 }
2192
2193 maincqr->endclk = get_clock();
2194 if ((maincqr->status != DASD_CQR_DONE) &&
2195 (maincqr->intrc != -ERESTARTSYS))
2196 dasd_log_sense(maincqr, &maincqr->irb);
2197 if (maincqr->status == DASD_CQR_DONE)
2198 rc = 0;
2199 else if (maincqr->intrc)
2200 rc = maincqr->intrc;
2201 else
2202 rc = -EIO;
2203 return rc;
2204}
2205
2206/*
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002207 * Queue a request to the tail of the device ccw_queue and wait for
2208 * it's completion.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002209 */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002210int dasd_sleep_on(struct dasd_ccw_req *cqr)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002211{
Stefan Weinhubereb6e1992009-12-07 12:51:51 +01002212 return _dasd_sleep_on(cqr, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002213}
2214
2215/*
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002216 * Queue a request to the tail of the device ccw_queue and wait
2217 * interruptible for it's completion.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002218 */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002219int dasd_sleep_on_interruptible(struct dasd_ccw_req *cqr)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002220{
Stefan Weinhubereb6e1992009-12-07 12:51:51 +01002221 return _dasd_sleep_on(cqr, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002222}
2223
2224/*
2225 * Whoa nelly now it gets really hairy. For some functions (e.g. steal lock
2226 * for eckd devices) the currently running request has to be terminated
2227 * and be put back to status queued, before the special request is added
2228 * to the head of the queue. Then the special request is waited on normally.
2229 */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002230static inline int _dasd_term_running_cqr(struct dasd_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002231{
2232 struct dasd_ccw_req *cqr;
Stefan Haberlandaade6c02011-05-10 17:13:38 +02002233 int rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002234
2235 if (list_empty(&device->ccw_queue))
2236 return 0;
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002237 cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist);
Stefan Haberlandaade6c02011-05-10 17:13:38 +02002238 rc = device->discipline->term_IO(cqr);
2239 if (!rc)
2240 /*
2241 * CQR terminated because a more important request is pending.
2242 * Undo decreasing of retry counter because this is
2243 * not an error case.
2244 */
2245 cqr->retries++;
2246 return rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002247}
2248
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002249int dasd_sleep_on_immediatly(struct dasd_ccw_req *cqr)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002250{
Linus Torvalds1da177e2005-04-16 15:20:36 -07002251 struct dasd_device *device;
2252 int rc;
Horst Hummel138c0142006-06-29 14:58:12 +02002253
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002254 device = cqr->startdev;
Stefan Weinhuber5a27e602011-01-05 12:48:04 +01002255 if (test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags) &&
2256 !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) {
2257 cqr->status = DASD_CQR_FAILED;
2258 cqr->intrc = -EPERM;
2259 return -EIO;
2260 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002261 spin_lock_irq(get_ccwdev_lock(device->cdev));
2262 rc = _dasd_term_running_cqr(device);
2263 if (rc) {
2264 spin_unlock_irq(get_ccwdev_lock(device->cdev));
2265 return rc;
2266 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002267 cqr->callback = dasd_wakeup_cb;
Stefan Weinhuber1c1e0932010-05-12 09:32:11 +02002268 cqr->callback_data = DASD_SLEEPON_START_TAG;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002269 cqr->status = DASD_CQR_QUEUED;
Stefan Haberland214b8ff2011-10-30 15:16:56 +01002270 /*
2271 * add new request as second
2272 * first the terminated cqr needs to be finished
2273 */
2274 list_add(&cqr->devlist, device->ccw_queue.next);
Horst Hummel138c0142006-06-29 14:58:12 +02002275
Linus Torvalds1da177e2005-04-16 15:20:36 -07002276 /* let the bh start the request to keep them in order */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002277 dasd_schedule_device_bh(device);
Horst Hummel138c0142006-06-29 14:58:12 +02002278
Linus Torvalds1da177e2005-04-16 15:20:36 -07002279 spin_unlock_irq(get_ccwdev_lock(device->cdev));
2280
Stefan Haberlandc80ee722008-05-30 10:03:31 +02002281 wait_event(generic_waitq, _wait_for_wakeup(cqr));
Horst Hummel138c0142006-06-29 14:58:12 +02002282
Stefan Weinhuber6cc7f162009-06-12 10:26:39 +02002283 if (cqr->status == DASD_CQR_DONE)
2284 rc = 0;
2285 else if (cqr->intrc)
2286 rc = cqr->intrc;
2287 else
2288 rc = -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002289 return rc;
2290}
2291
2292/*
2293 * Cancels a request that was started with dasd_sleep_on_req.
2294 * This is useful to timeout requests. The request will be
2295 * terminated if it is currently in i/o.
2296 * Returns 1 if the request has been terminated.
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002297 * 0 if there was no need to terminate the request (not started yet)
2298 * negative error code if termination failed
2299 * Cancellation of a request is an asynchronous operation! The calling
2300 * function has to wait until the request is properly returned via callback.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002301 */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002302int dasd_cancel_req(struct dasd_ccw_req *cqr)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002303{
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002304 struct dasd_device *device = cqr->startdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002305 unsigned long flags;
2306 int rc;
2307
2308 rc = 0;
2309 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
2310 switch (cqr->status) {
2311 case DASD_CQR_QUEUED:
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002312 /* request was not started - just set to cleared */
2313 cqr->status = DASD_CQR_CLEARED;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002314 break;
2315 case DASD_CQR_IN_IO:
2316 /* request in IO - terminate IO and release again */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002317 rc = device->discipline->term_IO(cqr);
2318 if (rc) {
Stefan Haberlandfc19f382009-03-26 15:23:49 +01002319 dev_err(&device->cdev->dev,
2320 "Cancelling request %p failed with rc=%d\n",
2321 cqr, rc);
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002322 } else {
2323 cqr->stopclk = get_clock();
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002324 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002325 break;
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002326 default: /* already finished or clear pending - do nothing */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002327 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002328 }
2329 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002330 dasd_schedule_device_bh(device);
2331 return rc;
2332}
2333
2334
2335/*
2336 * SECTION: Operations of the dasd_block layer.
2337 */
2338
2339/*
2340 * Timeout function for dasd_block. This is used when the block layer
2341 * is waiting for something that may not come reliably, (e.g. a state
2342 * change interrupt)
2343 */
2344static void dasd_block_timeout(unsigned long ptr)
2345{
2346 unsigned long flags;
2347 struct dasd_block *block;
2348
2349 block = (struct dasd_block *) ptr;
2350 spin_lock_irqsave(get_ccwdev_lock(block->base->cdev), flags);
2351 /* re-activate request queue */
Stefan Weinhubereb6e1992009-12-07 12:51:51 +01002352 dasd_device_remove_stop_bits(block->base, DASD_STOPPED_PENDING);
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002353 spin_unlock_irqrestore(get_ccwdev_lock(block->base->cdev), flags);
2354 dasd_schedule_block_bh(block);
2355}
2356
2357/*
2358 * Setup timeout for a dasd_block in jiffies.
2359 */
2360void dasd_block_set_timer(struct dasd_block *block, int expires)
2361{
Stefan Weinhuber48cae882009-02-11 10:37:31 +01002362 if (expires == 0)
2363 del_timer(&block->timer);
2364 else
2365 mod_timer(&block->timer, jiffies + expires);
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002366}
2367
2368/*
2369 * Clear timeout for a dasd_block.
2370 */
2371void dasd_block_clear_timer(struct dasd_block *block)
2372{
Stefan Weinhuber48cae882009-02-11 10:37:31 +01002373 del_timer(&block->timer);
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002374}
2375
2376/*
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002377 * Process finished error recovery ccw.
2378 */
Stefan Weinhubereb6e1992009-12-07 12:51:51 +01002379static void __dasd_process_erp(struct dasd_device *device,
2380 struct dasd_ccw_req *cqr)
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002381{
2382 dasd_erp_fn_t erp_fn;
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002383
2384 if (cqr->status == DASD_CQR_DONE)
2385 DBF_DEV_EVENT(DBF_NOTICE, device, "%s", "ERP successful");
2386 else
Stefan Haberlandfc19f382009-03-26 15:23:49 +01002387 dev_err(&device->cdev->dev, "ERP failed for the DASD\n");
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002388 erp_fn = device->discipline->erp_postaction(cqr);
2389 erp_fn(cqr);
2390}
2391
2392/*
2393 * Fetch requests from the block device queue.
2394 */
2395static void __dasd_process_request_queue(struct dasd_block *block)
2396{
2397 struct request_queue *queue;
2398 struct request *req;
2399 struct dasd_ccw_req *cqr;
2400 struct dasd_device *basedev;
2401 unsigned long flags;
2402 queue = block->request_queue;
2403 basedev = block->base;
2404 /* No queue ? Then there is nothing to do. */
2405 if (queue == NULL)
2406 return;
2407
2408 /*
2409 * We requeue request from the block device queue to the ccw
2410 * queue only in two states. In state DASD_STATE_READY the
2411 * partition detection is done and we need to requeue requests
2412 * for that. State DASD_STATE_ONLINE is normal block device
2413 * operation.
2414 */
Stefan Weinhuber97f604b2009-09-11 10:28:28 +02002415 if (basedev->state < DASD_STATE_READY) {
2416 while ((req = blk_fetch_request(block->request_queue)))
2417 __blk_end_request_all(req, -EIO);
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002418 return;
Stefan Weinhuber97f604b2009-09-11 10:28:28 +02002419 }
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002420 /* Now we try to fetch requests from the request queue */
Jens Axboe7eaceac2011-03-10 08:52:07 +01002421 while ((req = blk_peek_request(queue))) {
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002422 if (basedev->features & DASD_FEATURE_READONLY &&
2423 rq_data_dir(req) == WRITE) {
2424 DBF_DEV_EVENT(DBF_ERR, basedev,
2425 "Rejecting write request %p",
2426 req);
Tejun Heo9934c8c2009-05-08 11:54:16 +09002427 blk_start_request(req);
Tejun Heo40cbbb72009-04-23 11:05:19 +09002428 __blk_end_request_all(req, -EIO);
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002429 continue;
2430 }
2431 cqr = basedev->discipline->build_cp(basedev, block, req);
2432 if (IS_ERR(cqr)) {
2433 if (PTR_ERR(cqr) == -EBUSY)
2434 break; /* normal end condition */
2435 if (PTR_ERR(cqr) == -ENOMEM)
2436 break; /* terminate request queue loop */
2437 if (PTR_ERR(cqr) == -EAGAIN) {
2438 /*
2439 * The current request cannot be build right
2440 * now, we have to try later. If this request
2441 * is the head-of-queue we stop the device
2442 * for 1/2 second.
2443 */
2444 if (!list_empty(&block->ccw_queue))
2445 break;
Stefan Weinhubereb6e1992009-12-07 12:51:51 +01002446 spin_lock_irqsave(
2447 get_ccwdev_lock(basedev->cdev), flags);
2448 dasd_device_set_stop_bits(basedev,
2449 DASD_STOPPED_PENDING);
2450 spin_unlock_irqrestore(
2451 get_ccwdev_lock(basedev->cdev), flags);
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002452 dasd_block_set_timer(block, HZ/2);
2453 break;
2454 }
2455 DBF_DEV_EVENT(DBF_ERR, basedev,
2456 "CCW creation failed (rc=%ld) "
2457 "on request %p",
2458 PTR_ERR(cqr), req);
Tejun Heo9934c8c2009-05-08 11:54:16 +09002459 blk_start_request(req);
Tejun Heo40cbbb72009-04-23 11:05:19 +09002460 __blk_end_request_all(req, -EIO);
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002461 continue;
2462 }
2463 /*
2464 * Note: callback is set to dasd_return_cqr_cb in
2465 * __dasd_block_start_head to cover erp requests as well
2466 */
2467 cqr->callback_data = (void *) req;
2468 cqr->status = DASD_CQR_FILLED;
Tejun Heo9934c8c2009-05-08 11:54:16 +09002469 blk_start_request(req);
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002470 list_add_tail(&cqr->blocklist, &block->ccw_queue);
2471 dasd_profile_start(block, cqr, req);
2472 }
2473}
2474
2475static void __dasd_cleanup_cqr(struct dasd_ccw_req *cqr)
2476{
2477 struct request *req;
2478 int status;
Kiyoshi Ueda4c4e2142008-01-28 10:29:42 +01002479 int error = 0;
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002480
2481 req = (struct request *) cqr->callback_data;
2482 dasd_profile_end(cqr->block, cqr, req);
Stefan Weinhuberfe6b8e72008-02-05 16:50:47 +01002483 status = cqr->block->base->discipline->free_cp(cqr, req);
Kiyoshi Ueda4c4e2142008-01-28 10:29:42 +01002484 if (status <= 0)
2485 error = status ? status : -EIO;
Tejun Heo40cbbb72009-04-23 11:05:19 +09002486 __blk_end_request_all(req, error);
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002487}
2488
2489/*
2490 * Process ccw request queue.
2491 */
2492static void __dasd_process_block_ccw_queue(struct dasd_block *block,
2493 struct list_head *final_queue)
2494{
2495 struct list_head *l, *n;
2496 struct dasd_ccw_req *cqr;
2497 dasd_erp_fn_t erp_fn;
2498 unsigned long flags;
2499 struct dasd_device *base = block->base;
2500
2501restart:
2502 /* Process request with final status. */
2503 list_for_each_safe(l, n, &block->ccw_queue) {
2504 cqr = list_entry(l, struct dasd_ccw_req, blocklist);
2505 if (cqr->status != DASD_CQR_DONE &&
2506 cqr->status != DASD_CQR_FAILED &&
2507 cqr->status != DASD_CQR_NEED_ERP &&
2508 cqr->status != DASD_CQR_TERMINATED)
2509 continue;
2510
2511 if (cqr->status == DASD_CQR_TERMINATED) {
2512 base->discipline->handle_terminated_request(cqr);
2513 goto restart;
2514 }
2515
2516 /* Process requests that may be recovered */
2517 if (cqr->status == DASD_CQR_NEED_ERP) {
Stefan Haberland6c5f57c2008-02-05 16:50:46 +01002518 erp_fn = base->discipline->erp_action(cqr);
Stefan Haberland6a5176c2010-04-22 17:17:02 +02002519 if (IS_ERR(erp_fn(cqr)))
2520 continue;
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002521 goto restart;
2522 }
2523
Stefan Haberlanda9cffb22008-11-14 18:18:08 +01002524 /* log sense for fatal error */
2525 if (cqr->status == DASD_CQR_FAILED) {
2526 dasd_log_sense(cqr, &cqr->irb);
2527 }
2528
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002529 /* First of all call extended error reporting. */
2530 if (dasd_eer_enabled(base) &&
2531 cqr->status == DASD_CQR_FAILED) {
2532 dasd_eer_write(base, cqr, DASD_EER_FATALERROR);
2533
2534 /* restart request */
2535 cqr->status = DASD_CQR_FILLED;
2536 cqr->retries = 255;
2537 spin_lock_irqsave(get_ccwdev_lock(base->cdev), flags);
Stefan Weinhubereb6e1992009-12-07 12:51:51 +01002538 dasd_device_set_stop_bits(base, DASD_STOPPED_QUIESCE);
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002539 spin_unlock_irqrestore(get_ccwdev_lock(base->cdev),
2540 flags);
2541 goto restart;
2542 }
2543
2544 /* Process finished ERP request. */
2545 if (cqr->refers) {
Stefan Weinhubereb6e1992009-12-07 12:51:51 +01002546 __dasd_process_erp(base, cqr);
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002547 goto restart;
2548 }
2549
2550 /* Rechain finished requests to final queue */
2551 cqr->endclk = get_clock();
2552 list_move_tail(&cqr->blocklist, final_queue);
2553 }
2554}
2555
2556static void dasd_return_cqr_cb(struct dasd_ccw_req *cqr, void *data)
2557{
2558 dasd_schedule_block_bh(cqr->block);
2559}
2560
2561static void __dasd_block_start_head(struct dasd_block *block)
2562{
2563 struct dasd_ccw_req *cqr;
2564
2565 if (list_empty(&block->ccw_queue))
2566 return;
2567 /* We allways begin with the first requests on the queue, as some
2568 * of previously started requests have to be enqueued on a
2569 * dasd_device again for error recovery.
2570 */
2571 list_for_each_entry(cqr, &block->ccw_queue, blocklist) {
2572 if (cqr->status != DASD_CQR_FILLED)
2573 continue;
Stefan Weinhuber5a27e602011-01-05 12:48:04 +01002574 if (test_bit(DASD_FLAG_LOCK_STOLEN, &block->base->flags) &&
2575 !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) {
2576 cqr->status = DASD_CQR_FAILED;
2577 cqr->intrc = -EPERM;
2578 dasd_schedule_block_bh(block);
2579 continue;
2580 }
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002581 /* Non-temporary stop condition will trigger fail fast */
2582 if (block->base->stopped & ~DASD_STOPPED_PENDING &&
2583 test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags) &&
2584 (!dasd_eer_enabled(block->base))) {
2585 cqr->status = DASD_CQR_FAILED;
2586 dasd_schedule_block_bh(block);
2587 continue;
2588 }
2589 /* Don't try to start requests if device is stopped */
2590 if (block->base->stopped)
2591 return;
2592
2593 /* just a fail safe check, should not happen */
2594 if (!cqr->startdev)
2595 cqr->startdev = block->base;
2596
2597 /* make sure that the requests we submit find their way back */
2598 cqr->callback = dasd_return_cqr_cb;
2599
2600 dasd_add_request_tail(cqr);
2601 }
2602}
2603
2604/*
2605 * Central dasd_block layer routine. Takes requests from the generic
2606 * block layer request queue, creates ccw requests, enqueues them on
2607 * a dasd_device and processes ccw requests that have been returned.
2608 */
2609static void dasd_block_tasklet(struct dasd_block *block)
2610{
2611 struct list_head final_queue;
2612 struct list_head *l, *n;
2613 struct dasd_ccw_req *cqr;
2614
2615 atomic_set(&block->tasklet_scheduled, 0);
2616 INIT_LIST_HEAD(&final_queue);
2617 spin_lock(&block->queue_lock);
2618 /* Finish off requests on ccw queue */
2619 __dasd_process_block_ccw_queue(block, &final_queue);
2620 spin_unlock(&block->queue_lock);
2621 /* Now call the callback function of requests with final status */
2622 spin_lock_irq(&block->request_queue_lock);
2623 list_for_each_safe(l, n, &final_queue) {
2624 cqr = list_entry(l, struct dasd_ccw_req, blocklist);
2625 list_del_init(&cqr->blocklist);
2626 __dasd_cleanup_cqr(cqr);
2627 }
2628 spin_lock(&block->queue_lock);
2629 /* Get new request from the block device request queue */
2630 __dasd_process_request_queue(block);
2631 /* Now check if the head of the ccw queue needs to be started. */
2632 __dasd_block_start_head(block);
2633 spin_unlock(&block->queue_lock);
2634 spin_unlock_irq(&block->request_queue_lock);
2635 dasd_put_device(block->base);
2636}
2637
2638static void _dasd_wake_block_flush_cb(struct dasd_ccw_req *cqr, void *data)
2639{
2640 wake_up(&dasd_flush_wq);
2641}
2642
2643/*
2644 * Go through all request on the dasd_block request queue, cancel them
2645 * on the respective dasd_device, and return them to the generic
2646 * block layer.
2647 */
2648static int dasd_flush_block_queue(struct dasd_block *block)
2649{
2650 struct dasd_ccw_req *cqr, *n;
2651 int rc, i;
2652 struct list_head flush_queue;
2653
2654 INIT_LIST_HEAD(&flush_queue);
2655 spin_lock_bh(&block->queue_lock);
2656 rc = 0;
2657restart:
2658 list_for_each_entry_safe(cqr, n, &block->ccw_queue, blocklist) {
2659 /* if this request currently owned by a dasd_device cancel it */
2660 if (cqr->status >= DASD_CQR_QUEUED)
2661 rc = dasd_cancel_req(cqr);
2662 if (rc < 0)
2663 break;
2664 /* Rechain request (including erp chain) so it won't be
2665 * touched by the dasd_block_tasklet anymore.
2666 * Replace the callback so we notice when the request
2667 * is returned from the dasd_device layer.
2668 */
2669 cqr->callback = _dasd_wake_block_flush_cb;
2670 for (i = 0; cqr != NULL; cqr = cqr->refers, i++)
2671 list_move_tail(&cqr->blocklist, &flush_queue);
2672 if (i > 1)
2673 /* moved more than one request - need to restart */
2674 goto restart;
2675 }
2676 spin_unlock_bh(&block->queue_lock);
2677 /* Now call the callback function of flushed requests */
2678restart_cb:
2679 list_for_each_entry_safe(cqr, n, &flush_queue, blocklist) {
2680 wait_event(dasd_flush_wq, (cqr->status < DASD_CQR_QUEUED));
2681 /* Process finished ERP request. */
2682 if (cqr->refers) {
Stefan Haberland0cd4bd42008-12-25 13:38:54 +01002683 spin_lock_bh(&block->queue_lock);
Stefan Weinhubereb6e1992009-12-07 12:51:51 +01002684 __dasd_process_erp(block->base, cqr);
Stefan Haberland0cd4bd42008-12-25 13:38:54 +01002685 spin_unlock_bh(&block->queue_lock);
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002686 /* restart list_for_xx loop since dasd_process_erp
2687 * might remove multiple elements */
2688 goto restart_cb;
2689 }
2690 /* call the callback function */
Stefan Haberland0cd4bd42008-12-25 13:38:54 +01002691 spin_lock_irq(&block->request_queue_lock);
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002692 cqr->endclk = get_clock();
2693 list_del_init(&cqr->blocklist);
2694 __dasd_cleanup_cqr(cqr);
Stefan Haberland0cd4bd42008-12-25 13:38:54 +01002695 spin_unlock_irq(&block->request_queue_lock);
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002696 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002697 return rc;
2698}
2699
2700/*
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002701 * Schedules a call to dasd_tasklet over the device tasklet.
2702 */
2703void dasd_schedule_block_bh(struct dasd_block *block)
2704{
2705 /* Protect against rescheduling. */
2706 if (atomic_cmpxchg(&block->tasklet_scheduled, 0, 1) != 0)
2707 return;
2708 /* life cycle of block is bound to it's base device */
2709 dasd_get_device(block->base);
2710 tasklet_hi_schedule(&block->tasklet);
2711}
2712
2713
2714/*
2715 * SECTION: external block device operations
2716 * (request queue handling, open, release, etc.)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002717 */
2718
2719/*
2720 * Dasd request queue function. Called from ll_rw_blk.c
2721 */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002722static void do_dasd_request(struct request_queue *queue)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002723{
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002724 struct dasd_block *block;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002725
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002726 block = queue->queuedata;
2727 spin_lock(&block->queue_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002728 /* Get new request from the block device request queue */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002729 __dasd_process_request_queue(block);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002730 /* Now check if the head of the ccw queue needs to be started. */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002731 __dasd_block_start_head(block);
2732 spin_unlock(&block->queue_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002733}
2734
2735/*
2736 * Allocate and initialize request queue and default I/O scheduler.
2737 */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002738static int dasd_alloc_queue(struct dasd_block *block)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002739{
2740 int rc;
2741
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002742 block->request_queue = blk_init_queue(do_dasd_request,
2743 &block->request_queue_lock);
2744 if (block->request_queue == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002745 return -ENOMEM;
2746
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002747 block->request_queue->queuedata = block;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002748
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002749 elevator_exit(block->request_queue->elevator);
Josef 'Jeff' Sipek08a8a0c2008-04-17 07:45:56 +02002750 block->request_queue->elevator = NULL;
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002751 rc = elevator_init(block->request_queue, "deadline");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002752 if (rc) {
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002753 blk_cleanup_queue(block->request_queue);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002754 return rc;
2755 }
2756 return 0;
2757}
2758
2759/*
2760 * Allocate and initialize request queue.
2761 */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002762static void dasd_setup_queue(struct dasd_block *block)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002763{
2764 int max;
2765
Stefan Haberlande4dbb0f2011-01-05 12:48:06 +01002766 if (block->base->features & DASD_FEATURE_USERAW) {
2767 /*
2768 * the max_blocks value for raw_track access is 256
2769 * it is higher than the native ECKD value because we
2770 * only need one ccw per track
2771 * so the max_hw_sectors are
2772 * 2048 x 512B = 1024kB = 16 tracks
2773 */
2774 max = 2048;
2775 } else {
2776 max = block->base->discipline->max_blocks << block->s2b_shift;
2777 }
2778 blk_queue_logical_block_size(block->request_queue,
2779 block->bp_block);
Martin K. Petersen086fa5f2010-02-26 00:20:38 -05002780 blk_queue_max_hw_sectors(block->request_queue, max);
Martin K. Petersen8a783622010-02-26 00:20:39 -05002781 blk_queue_max_segments(block->request_queue, -1L);
Stefan Weinhuberf3eb5382009-03-26 15:23:48 +01002782 /* with page sized segments we can translate each segement into
2783 * one idaw/tidaw
2784 */
2785 blk_queue_max_segment_size(block->request_queue, PAGE_SIZE);
2786 blk_queue_segment_boundary(block->request_queue, PAGE_SIZE - 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002787}
2788
2789/*
2790 * Deactivate and free request queue.
2791 */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002792static void dasd_free_queue(struct dasd_block *block)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002793{
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002794 if (block->request_queue) {
2795 blk_cleanup_queue(block->request_queue);
2796 block->request_queue = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002797 }
2798}
2799
2800/*
2801 * Flush request on the request queue.
2802 */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002803static void dasd_flush_request_queue(struct dasd_block *block)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002804{
2805 struct request *req;
2806
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002807 if (!block->request_queue)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002808 return;
Horst Hummel138c0142006-06-29 14:58:12 +02002809
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002810 spin_lock_irq(&block->request_queue_lock);
Tejun Heo9934c8c2009-05-08 11:54:16 +09002811 while ((req = blk_fetch_request(block->request_queue)))
Tejun Heo40cbbb72009-04-23 11:05:19 +09002812 __blk_end_request_all(req, -EIO);
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002813 spin_unlock_irq(&block->request_queue_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002814}
2815
Al Viro57a7c0b2008-03-02 10:36:08 -05002816static int dasd_open(struct block_device *bdev, fmode_t mode)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002817{
Stefan Haberland9eb25122010-02-26 22:37:46 +01002818 struct dasd_device *base;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002819 int rc;
2820
Stefan Weinhuber65f8da42011-04-20 10:15:30 +02002821 base = dasd_device_from_gendisk(bdev->bd_disk);
2822 if (!base)
Stefan Haberland9eb25122010-02-26 22:37:46 +01002823 return -ENODEV;
2824
Stefan Weinhuber65f8da42011-04-20 10:15:30 +02002825 atomic_inc(&base->block->open_count);
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002826 if (test_bit(DASD_FLAG_OFFLINE, &base->flags)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002827 rc = -ENODEV;
2828 goto unlock;
2829 }
2830
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002831 if (!try_module_get(base->discipline->owner)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002832 rc = -EINVAL;
2833 goto unlock;
2834 }
2835
2836 if (dasd_probeonly) {
Stefan Haberlandfc19f382009-03-26 15:23:49 +01002837 dev_info(&base->cdev->dev,
2838 "Accessing the DASD failed because it is in "
2839 "probeonly mode\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002840 rc = -EPERM;
2841 goto out;
2842 }
2843
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002844 if (base->state <= DASD_STATE_BASIC) {
2845 DBF_DEV_EVENT(DBF_ERR, base, " %s",
Linus Torvalds1da177e2005-04-16 15:20:36 -07002846 " Cannot open unrecognized device");
2847 rc = -ENODEV;
2848 goto out;
2849 }
2850
Stefan Weinhuber33b62a32010-03-08 12:26:24 +01002851 if ((mode & FMODE_WRITE) &&
2852 (test_bit(DASD_FLAG_DEVICE_RO, &base->flags) ||
2853 (base->features & DASD_FEATURE_READONLY))) {
2854 rc = -EROFS;
2855 goto out;
2856 }
2857
Stefan Weinhuber65f8da42011-04-20 10:15:30 +02002858 dasd_put_device(base);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002859 return 0;
2860
2861out:
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002862 module_put(base->discipline->owner);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002863unlock:
Stefan Weinhuber65f8da42011-04-20 10:15:30 +02002864 atomic_dec(&base->block->open_count);
2865 dasd_put_device(base);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002866 return rc;
2867}
2868
Al Viro57a7c0b2008-03-02 10:36:08 -05002869static int dasd_release(struct gendisk *disk, fmode_t mode)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002870{
Stefan Weinhuber65f8da42011-04-20 10:15:30 +02002871 struct dasd_device *base;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002872
Stefan Weinhuber65f8da42011-04-20 10:15:30 +02002873 base = dasd_device_from_gendisk(disk);
2874 if (!base)
2875 return -ENODEV;
2876
2877 atomic_dec(&base->block->open_count);
2878 module_put(base->discipline->owner);
2879 dasd_put_device(base);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002880 return 0;
2881}
2882
Christoph Hellwiga885c8c2006-01-08 01:02:50 -08002883/*
2884 * Return disk geometry.
2885 */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002886static int dasd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
Christoph Hellwiga885c8c2006-01-08 01:02:50 -08002887{
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002888 struct dasd_device *base;
Christoph Hellwiga885c8c2006-01-08 01:02:50 -08002889
Stefan Weinhuber65f8da42011-04-20 10:15:30 +02002890 base = dasd_device_from_gendisk(bdev->bd_disk);
2891 if (!base)
Christoph Hellwiga885c8c2006-01-08 01:02:50 -08002892 return -ENODEV;
2893
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002894 if (!base->discipline ||
Stefan Weinhuber65f8da42011-04-20 10:15:30 +02002895 !base->discipline->fill_geometry) {
2896 dasd_put_device(base);
Christoph Hellwiga885c8c2006-01-08 01:02:50 -08002897 return -EINVAL;
Stefan Weinhuber65f8da42011-04-20 10:15:30 +02002898 }
2899 base->discipline->fill_geometry(base->block, geo);
2900 geo->start = get_start_sect(bdev) >> base->block->s2b_shift;
2901 dasd_put_device(base);
Christoph Hellwiga885c8c2006-01-08 01:02:50 -08002902 return 0;
2903}
2904
Alexey Dobriyan83d5cde2009-09-21 17:01:13 -07002905const struct block_device_operations
Linus Torvalds1da177e2005-04-16 15:20:36 -07002906dasd_device_operations = {
2907 .owner = THIS_MODULE,
Al Viro57a7c0b2008-03-02 10:36:08 -05002908 .open = dasd_open,
2909 .release = dasd_release,
Heiko Carstens0000d032009-03-26 15:23:45 +01002910 .ioctl = dasd_ioctl,
2911 .compat_ioctl = dasd_ioctl,
Christoph Hellwiga885c8c2006-01-08 01:02:50 -08002912 .getgeo = dasd_getgeo,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002913};
2914
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002915/*******************************************************************************
2916 * end of block device operations
2917 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002918
2919static void
2920dasd_exit(void)
2921{
2922#ifdef CONFIG_PROC_FS
2923 dasd_proc_exit();
2924#endif
Stefan Weinhuber20c64462006-03-24 03:15:25 -08002925 dasd_eer_exit();
Horst Hummel6bb0e012005-07-27 11:45:03 -07002926 if (dasd_page_cache != NULL) {
2927 kmem_cache_destroy(dasd_page_cache);
2928 dasd_page_cache = NULL;
2929 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002930 dasd_gendisk_exit();
2931 dasd_devmap_exit();
Linus Torvalds1da177e2005-04-16 15:20:36 -07002932 if (dasd_debug_area != NULL) {
2933 debug_unregister(dasd_debug_area);
2934 dasd_debug_area = NULL;
2935 }
Stefan Weinhuber4fa52aa2011-07-24 10:48:32 +02002936 dasd_statistics_removeroot();
Linus Torvalds1da177e2005-04-16 15:20:36 -07002937}
2938
2939/*
2940 * SECTION: common functions for ccw_driver use
2941 */
2942
Stefan Weinhuber33b62a32010-03-08 12:26:24 +01002943/*
2944 * Is the device read-only?
2945 * Note that this function does not report the setting of the
2946 * readonly device attribute, but how it is configured in z/VM.
2947 */
2948int dasd_device_is_ro(struct dasd_device *device)
2949{
2950 struct ccw_dev_id dev_id;
2951 struct diag210 diag_data;
2952 int rc;
2953
2954 if (!MACHINE_IS_VM)
2955 return 0;
2956 ccw_device_get_id(device->cdev, &dev_id);
2957 memset(&diag_data, 0, sizeof(diag_data));
2958 diag_data.vrdcdvno = dev_id.devno;
2959 diag_data.vrdclen = sizeof(diag_data);
2960 rc = diag210(&diag_data);
2961 if (rc == 0 || rc == 2) {
2962 return diag_data.vrdcvfla & 0x80;
2963 } else {
2964 DBF_EVENT(DBF_WARNING, "diag210 failed for dev=%04x with rc=%d",
2965 dev_id.devno, rc);
2966 return 0;
2967 }
2968}
2969EXPORT_SYMBOL_GPL(dasd_device_is_ro);
2970
Cornelia Huckf3445a12009-04-14 15:36:23 +02002971static void dasd_generic_auto_online(void *data, async_cookie_t cookie)
2972{
2973 struct ccw_device *cdev = data;
2974 int ret;
2975
2976 ret = ccw_device_set_online(cdev);
2977 if (ret)
2978 pr_warning("%s: Setting the DASD online failed with rc=%d\n",
2979 dev_name(&cdev->dev), ret);
Cornelia Huckf3445a12009-04-14 15:36:23 +02002980}
2981
Horst Hummel1c01b8a2006-01-06 00:19:15 -08002982/*
2983 * Initial attempt at a probe function. this can be simplified once
2984 * the other detection code is gone.
2985 */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01002986int dasd_generic_probe(struct ccw_device *cdev,
2987 struct dasd_discipline *discipline)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002988{
2989 int ret;
2990
2991 ret = dasd_add_sysfs_files(cdev);
2992 if (ret) {
Stefan Haberlandb8ed5dd2009-12-07 12:51:52 +01002993 DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s",
2994 "dasd_generic_probe: could not add "
2995 "sysfs entries");
Horst Hummel40545572006-06-29 15:08:18 +02002996 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002997 }
Horst Hummel40545572006-06-29 15:08:18 +02002998 cdev->handler = &dasd_int_handler;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002999
Horst Hummel40545572006-06-29 15:08:18 +02003000 /*
3001 * Automatically online either all dasd devices (dasd_autodetect)
3002 * or all devices specified with dasd= parameters during
3003 * initial probe.
3004 */
3005 if ((dasd_get_feature(cdev, DASD_FEATURE_INITIAL_ONLINE) > 0 ) ||
Kay Sievers2a0217d2008-10-10 21:33:09 +02003006 (dasd_autodetect && dasd_busid_known(dev_name(&cdev->dev)) != 0))
Cornelia Huckf3445a12009-04-14 15:36:23 +02003007 async_schedule(dasd_generic_auto_online, cdev);
Stefan Haberlandde3e0da2008-01-26 14:11:08 +01003008 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003009}
3010
Horst Hummel1c01b8a2006-01-06 00:19:15 -08003011/*
3012 * This will one day be called from a global not_oper handler.
3013 * It is also used by driver_unregister during module unload.
3014 */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01003015void dasd_generic_remove(struct ccw_device *cdev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003016{
3017 struct dasd_device *device;
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01003018 struct dasd_block *block;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003019
Horst Hummel59afda72005-05-16 21:53:39 -07003020 cdev->handler = NULL;
3021
Linus Torvalds1da177e2005-04-16 15:20:36 -07003022 dasd_remove_sysfs_files(cdev);
3023 device = dasd_device_from_cdev(cdev);
3024 if (IS_ERR(device))
3025 return;
3026 if (test_and_set_bit(DASD_FLAG_OFFLINE, &device->flags)) {
3027 /* Already doing offline processing */
3028 dasd_put_device(device);
3029 return;
3030 }
3031 /*
3032 * This device is removed unconditionally. Set offline
3033 * flag to prevent dasd_open from opening it while it is
3034 * no quite down yet.
3035 */
3036 dasd_set_target_state(device, DASD_STATE_NEW);
3037 /* dasd_delete_device destroys the device reference. */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01003038 block = device->block;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003039 dasd_delete_device(device);
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01003040 /*
3041 * life cycle of block is bound to device, so delete it after
3042 * device was safely removed
3043 */
3044 if (block)
3045 dasd_free_block(block);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003046}
3047
Horst Hummel1c01b8a2006-01-06 00:19:15 -08003048/*
3049 * Activate a device. This is called from dasd_{eckd,fba}_probe() when either
Linus Torvalds1da177e2005-04-16 15:20:36 -07003050 * the device is detected for the first time and is supposed to be used
Horst Hummel1c01b8a2006-01-06 00:19:15 -08003051 * or the user has started activation through sysfs.
3052 */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01003053int dasd_generic_set_online(struct ccw_device *cdev,
3054 struct dasd_discipline *base_discipline)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003055{
Peter Oberparleiteraa888612006-02-20 18:28:13 -08003056 struct dasd_discipline *discipline;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003057 struct dasd_device *device;
Horst Hummelc6eb7b72005-09-03 15:57:58 -07003058 int rc;
Horst Hummelf24acd42005-05-01 08:58:59 -07003059
Horst Hummel40545572006-06-29 15:08:18 +02003060 /* first online clears initial online feature flag */
3061 dasd_set_feature(cdev, DASD_FEATURE_INITIAL_ONLINE, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003062 device = dasd_create_device(cdev);
3063 if (IS_ERR(device))
3064 return PTR_ERR(device);
3065
Peter Oberparleiteraa888612006-02-20 18:28:13 -08003066 discipline = base_discipline;
Horst Hummelc6eb7b72005-09-03 15:57:58 -07003067 if (device->features & DASD_FEATURE_USEDIAG) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07003068 if (!dasd_diag_discipline_pointer) {
Stefan Haberlandfc19f382009-03-26 15:23:49 +01003069 pr_warning("%s Setting the DASD online failed because "
3070 "of missing DIAG discipline\n",
3071 dev_name(&cdev->dev));
Linus Torvalds1da177e2005-04-16 15:20:36 -07003072 dasd_delete_device(device);
3073 return -ENODEV;
3074 }
3075 discipline = dasd_diag_discipline_pointer;
3076 }
Peter Oberparleiteraa888612006-02-20 18:28:13 -08003077 if (!try_module_get(base_discipline->owner)) {
3078 dasd_delete_device(device);
3079 return -EINVAL;
3080 }
3081 if (!try_module_get(discipline->owner)) {
3082 module_put(base_discipline->owner);
3083 dasd_delete_device(device);
3084 return -EINVAL;
3085 }
3086 device->base_discipline = base_discipline;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003087 device->discipline = discipline;
3088
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01003089 /* check_device will allocate block device if necessary */
Linus Torvalds1da177e2005-04-16 15:20:36 -07003090 rc = discipline->check_device(device);
3091 if (rc) {
Stefan Haberlandfc19f382009-03-26 15:23:49 +01003092 pr_warning("%s Setting the DASD online with discipline %s "
3093 "failed with rc=%i\n",
3094 dev_name(&cdev->dev), discipline->name, rc);
Peter Oberparleiteraa888612006-02-20 18:28:13 -08003095 module_put(discipline->owner);
3096 module_put(base_discipline->owner);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003097 dasd_delete_device(device);
3098 return rc;
3099 }
3100
3101 dasd_set_target_state(device, DASD_STATE_ONLINE);
3102 if (device->state <= DASD_STATE_KNOWN) {
Stefan Haberlandfc19f382009-03-26 15:23:49 +01003103 pr_warning("%s Setting the DASD online failed because of a "
3104 "missing discipline\n", dev_name(&cdev->dev));
Linus Torvalds1da177e2005-04-16 15:20:36 -07003105 rc = -ENODEV;
3106 dasd_set_target_state(device, DASD_STATE_NEW);
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01003107 if (device->block)
3108 dasd_free_block(device->block);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003109 dasd_delete_device(device);
3110 } else
3111 pr_debug("dasd_generic device %s found\n",
Kay Sievers2a0217d2008-10-10 21:33:09 +02003112 dev_name(&cdev->dev));
Stefan Haberland589c74d2010-02-26 22:37:47 +01003113
3114 wait_event(dasd_init_waitq, _wait_for_device(device));
3115
Linus Torvalds1da177e2005-04-16 15:20:36 -07003116 dasd_put_device(device);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003117 return rc;
3118}
3119
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01003120int dasd_generic_set_offline(struct ccw_device *cdev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003121{
3122 struct dasd_device *device;
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01003123 struct dasd_block *block;
Horst Hummeldafd87a2006-04-10 22:53:47 -07003124 int max_count, open_count;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003125
3126 device = dasd_device_from_cdev(cdev);
3127 if (IS_ERR(device))
3128 return PTR_ERR(device);
3129 if (test_and_set_bit(DASD_FLAG_OFFLINE, &device->flags)) {
3130 /* Already doing offline processing */
3131 dasd_put_device(device);
3132 return 0;
3133 }
3134 /*
3135 * We must make sure that this device is currently not in use.
3136 * The open_count is increased for every opener, that includes
3137 * the blkdev_get in dasd_scan_partitions. We are only interested
3138 * in the other openers.
3139 */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01003140 if (device->block) {
Heiko Carstensa8061702008-04-17 07:46:26 +02003141 max_count = device->block->bdev ? 0 : -1;
3142 open_count = atomic_read(&device->block->open_count);
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01003143 if (open_count > max_count) {
3144 if (open_count > 0)
Stefan Haberlandfc19f382009-03-26 15:23:49 +01003145 pr_warning("%s: The DASD cannot be set offline "
3146 "with open count %i\n",
3147 dev_name(&cdev->dev), open_count);
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01003148 else
Stefan Haberlandfc19f382009-03-26 15:23:49 +01003149 pr_warning("%s: The DASD cannot be set offline "
3150 "while it is in use\n",
3151 dev_name(&cdev->dev));
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01003152 clear_bit(DASD_FLAG_OFFLINE, &device->flags);
3153 dasd_put_device(device);
3154 return -EBUSY;
3155 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003156 }
3157 dasd_set_target_state(device, DASD_STATE_NEW);
3158 /* dasd_delete_device destroys the device reference. */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01003159 block = device->block;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003160 dasd_delete_device(device);
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01003161 /*
3162 * life cycle of block is bound to device, so delete it after
3163 * device was safely removed
3164 */
3165 if (block)
3166 dasd_free_block(block);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003167 return 0;
3168}
3169
Stefan Weinhubera4d26c62011-01-05 12:48:03 +01003170int dasd_generic_last_path_gone(struct dasd_device *device)
3171{
3172 struct dasd_ccw_req *cqr;
3173
3174 dev_warn(&device->cdev->dev, "No operational channel path is left "
3175 "for the device\n");
3176 DBF_DEV_EVENT(DBF_WARNING, device, "%s", "last path gone");
3177 /* First of all call extended error reporting. */
3178 dasd_eer_write(device, NULL, DASD_EER_NOPATH);
3179
3180 if (device->state < DASD_STATE_BASIC)
3181 return 0;
3182 /* Device is active. We want to keep it. */
3183 list_for_each_entry(cqr, &device->ccw_queue, devlist)
3184 if ((cqr->status == DASD_CQR_IN_IO) ||
3185 (cqr->status == DASD_CQR_CLEAR_PENDING)) {
3186 cqr->status = DASD_CQR_QUEUED;
3187 cqr->retries++;
3188 }
3189 dasd_device_set_stop_bits(device, DASD_STOPPED_DC_WAIT);
3190 dasd_device_clear_timer(device);
3191 dasd_schedule_device_bh(device);
3192 return 1;
3193}
3194EXPORT_SYMBOL_GPL(dasd_generic_last_path_gone);
3195
3196int dasd_generic_path_operational(struct dasd_device *device)
3197{
3198 dev_info(&device->cdev->dev, "A channel path to the device has become "
3199 "operational\n");
3200 DBF_DEV_EVENT(DBF_WARNING, device, "%s", "path operational");
3201 dasd_device_remove_stop_bits(device, DASD_STOPPED_DC_WAIT);
3202 if (device->stopped & DASD_UNRESUMED_PM) {
3203 dasd_device_remove_stop_bits(device, DASD_UNRESUMED_PM);
3204 dasd_restore_device(device);
3205 return 1;
3206 }
3207 dasd_schedule_device_bh(device);
3208 if (device->block)
3209 dasd_schedule_block_bh(device->block);
3210 return 1;
3211}
3212EXPORT_SYMBOL_GPL(dasd_generic_path_operational);
3213
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01003214int dasd_generic_notify(struct ccw_device *cdev, int event)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003215{
3216 struct dasd_device *device;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003217 int ret;
3218
Peter Oberparleiter91c36912008-08-21 19:46:39 +02003219 device = dasd_device_from_cdev_locked(cdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003220 if (IS_ERR(device))
3221 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003222 ret = 0;
3223 switch (event) {
3224 case CIO_GONE:
Sebastian Ott47593bf2009-03-31 19:16:05 +02003225 case CIO_BOXED:
Linus Torvalds1da177e2005-04-16 15:20:36 -07003226 case CIO_NO_PATH:
Stefan Weinhubera4d26c62011-01-05 12:48:03 +01003227 device->path_data.opm = 0;
3228 device->path_data.ppm = 0;
3229 device->path_data.npm = 0;
3230 ret = dasd_generic_last_path_gone(device);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003231 break;
3232 case CIO_OPER:
Linus Torvalds1da177e2005-04-16 15:20:36 -07003233 ret = 1;
Stefan Weinhubera4d26c62011-01-05 12:48:03 +01003234 if (device->path_data.opm)
3235 ret = dasd_generic_path_operational(device);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003236 break;
3237 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003238 dasd_put_device(device);
3239 return ret;
3240}
3241
Stefan Weinhubera4d26c62011-01-05 12:48:03 +01003242void dasd_generic_path_event(struct ccw_device *cdev, int *path_event)
3243{
3244 int chp;
3245 __u8 oldopm, eventlpm;
3246 struct dasd_device *device;
3247
3248 device = dasd_device_from_cdev_locked(cdev);
3249 if (IS_ERR(device))
3250 return;
3251 for (chp = 0; chp < 8; chp++) {
3252 eventlpm = 0x80 >> chp;
3253 if (path_event[chp] & PE_PATH_GONE) {
3254 oldopm = device->path_data.opm;
3255 device->path_data.opm &= ~eventlpm;
3256 device->path_data.ppm &= ~eventlpm;
3257 device->path_data.npm &= ~eventlpm;
3258 if (oldopm && !device->path_data.opm)
3259 dasd_generic_last_path_gone(device);
3260 }
3261 if (path_event[chp] & PE_PATH_AVAILABLE) {
3262 device->path_data.opm &= ~eventlpm;
3263 device->path_data.ppm &= ~eventlpm;
3264 device->path_data.npm &= ~eventlpm;
3265 device->path_data.tbvpm |= eventlpm;
3266 dasd_schedule_device_bh(device);
3267 }
Stefan Haberlandf1633032012-01-18 18:03:41 +01003268 if (path_event[chp] & PE_PATHGROUP_ESTABLISHED) {
3269 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
3270 "Pathgroup re-established\n");
3271 if (device->discipline->kick_validate)
3272 device->discipline->kick_validate(device);
3273 }
Stefan Weinhubera4d26c62011-01-05 12:48:03 +01003274 }
3275 dasd_put_device(device);
3276}
3277EXPORT_SYMBOL_GPL(dasd_generic_path_event);
3278
3279int dasd_generic_verify_path(struct dasd_device *device, __u8 lpm)
3280{
3281 if (!device->path_data.opm && lpm) {
3282 device->path_data.opm = lpm;
3283 dasd_generic_path_operational(device);
3284 } else
3285 device->path_data.opm |= lpm;
3286 return 0;
3287}
3288EXPORT_SYMBOL_GPL(dasd_generic_verify_path);
3289
3290
Stefan Haberlandd41dd122009-06-16 10:30:25 +02003291int dasd_generic_pm_freeze(struct ccw_device *cdev)
3292{
3293 struct dasd_ccw_req *cqr, *n;
3294 int rc;
3295 struct list_head freeze_queue;
3296 struct dasd_device *device = dasd_device_from_cdev(cdev);
3297
3298 if (IS_ERR(device))
3299 return PTR_ERR(device);
Stefan Haberland6f272b92011-01-05 12:48:05 +01003300
Stefan Haberlandc8d1c0f2011-10-30 15:17:09 +01003301 /* mark device as suspended */
3302 set_bit(DASD_FLAG_SUSPENDED, &device->flags);
3303
Stefan Haberland6f272b92011-01-05 12:48:05 +01003304 if (device->discipline->freeze)
3305 rc = device->discipline->freeze(device);
3306
Stefan Haberlandd41dd122009-06-16 10:30:25 +02003307 /* disallow new I/O */
Stefan Weinhubereb6e1992009-12-07 12:51:51 +01003308 dasd_device_set_stop_bits(device, DASD_STOPPED_PM);
Stefan Haberlandd41dd122009-06-16 10:30:25 +02003309 /* clear active requests */
3310 INIT_LIST_HEAD(&freeze_queue);
3311 spin_lock_irq(get_ccwdev_lock(cdev));
3312 rc = 0;
3313 list_for_each_entry_safe(cqr, n, &device->ccw_queue, devlist) {
3314 /* Check status and move request to flush_queue */
3315 if (cqr->status == DASD_CQR_IN_IO) {
3316 rc = device->discipline->term_IO(cqr);
3317 if (rc) {
3318 /* unable to terminate requeust */
3319 dev_err(&device->cdev->dev,
3320 "Unable to terminate request %p "
3321 "on suspend\n", cqr);
3322 spin_unlock_irq(get_ccwdev_lock(cdev));
3323 dasd_put_device(device);
3324 return rc;
3325 }
3326 }
3327 list_move_tail(&cqr->devlist, &freeze_queue);
3328 }
3329
3330 spin_unlock_irq(get_ccwdev_lock(cdev));
3331
3332 list_for_each_entry_safe(cqr, n, &freeze_queue, devlist) {
3333 wait_event(dasd_flush_wq,
3334 (cqr->status != DASD_CQR_CLEAR_PENDING));
3335 if (cqr->status == DASD_CQR_CLEARED)
3336 cqr->status = DASD_CQR_QUEUED;
3337 }
3338 /* move freeze_queue to start of the ccw_queue */
3339 spin_lock_irq(get_ccwdev_lock(cdev));
3340 list_splice_tail(&freeze_queue, &device->ccw_queue);
3341 spin_unlock_irq(get_ccwdev_lock(cdev));
3342
Stefan Haberlandd41dd122009-06-16 10:30:25 +02003343 dasd_put_device(device);
3344 return rc;
3345}
3346EXPORT_SYMBOL_GPL(dasd_generic_pm_freeze);
3347
3348int dasd_generic_restore_device(struct ccw_device *cdev)
3349{
3350 struct dasd_device *device = dasd_device_from_cdev(cdev);
3351 int rc = 0;
3352
3353 if (IS_ERR(device))
3354 return PTR_ERR(device);
3355
Stefan Haberlande6125fb2009-06-22 12:08:17 +02003356 /* allow new IO again */
Stefan Weinhubereb6e1992009-12-07 12:51:51 +01003357 dasd_device_remove_stop_bits(device,
3358 (DASD_STOPPED_PM | DASD_UNRESUMED_PM));
Stefan Haberlande6125fb2009-06-22 12:08:17 +02003359
Stefan Haberlandd41dd122009-06-16 10:30:25 +02003360 dasd_schedule_device_bh(device);
Stefan Haberlandd41dd122009-06-16 10:30:25 +02003361
Stefan Weinhubereb6e1992009-12-07 12:51:51 +01003362 /*
3363 * call discipline restore function
3364 * if device is stopped do nothing e.g. for disconnected devices
3365 */
3366 if (device->discipline->restore && !(device->stopped))
Stefan Haberlandd41dd122009-06-16 10:30:25 +02003367 rc = device->discipline->restore(device);
Stefan Weinhubereb6e1992009-12-07 12:51:51 +01003368 if (rc || device->stopped)
Stefan Haberlande6125fb2009-06-22 12:08:17 +02003369 /*
3370 * if the resume failed for the DASD we put it in
3371 * an UNRESUMED stop state
3372 */
3373 device->stopped |= DASD_UNRESUMED_PM;
Stefan Haberlandd41dd122009-06-16 10:30:25 +02003374
Stefan Haberland6fca97a2009-10-06 10:34:15 +02003375 if (device->block)
3376 dasd_schedule_block_bh(device->block);
3377
Stefan Haberlandc8d1c0f2011-10-30 15:17:09 +01003378 clear_bit(DASD_FLAG_SUSPENDED, &device->flags);
Stefan Haberlandd41dd122009-06-16 10:30:25 +02003379 dasd_put_device(device);
Stefan Haberlande6125fb2009-06-22 12:08:17 +02003380 return 0;
Stefan Haberlandd41dd122009-06-16 10:30:25 +02003381}
3382EXPORT_SYMBOL_GPL(dasd_generic_restore_device);
3383
Heiko Carstens763968e2007-05-10 15:45:46 +02003384static struct dasd_ccw_req *dasd_generic_build_rdc(struct dasd_device *device,
3385 void *rdc_buffer,
3386 int rdc_buffer_size,
Stefan Haberland68b781f2009-09-11 10:28:29 +02003387 int magic)
Cornelia Huck17283b52007-05-04 18:47:51 +02003388{
3389 struct dasd_ccw_req *cqr;
3390 struct ccw1 *ccw;
Stefan Haberlandd9fa9442009-10-14 12:43:48 +02003391 unsigned long *idaw;
Cornelia Huck17283b52007-05-04 18:47:51 +02003392
3393 cqr = dasd_smalloc_request(magic, 1 /* RDC */, rdc_buffer_size, device);
3394
3395 if (IS_ERR(cqr)) {
Stefan Haberlandfc19f382009-03-26 15:23:49 +01003396 /* internal error 13 - Allocating the RDC request failed*/
3397 dev_err(&device->cdev->dev,
3398 "An error occurred in the DASD device driver, "
3399 "reason=%s\n", "13");
Cornelia Huck17283b52007-05-04 18:47:51 +02003400 return cqr;
3401 }
3402
3403 ccw = cqr->cpaddr;
3404 ccw->cmd_code = CCW_CMD_RDC;
Stefan Haberlandd9fa9442009-10-14 12:43:48 +02003405 if (idal_is_needed(rdc_buffer, rdc_buffer_size)) {
3406 idaw = (unsigned long *) (cqr->data);
3407 ccw->cda = (__u32)(addr_t) idaw;
3408 ccw->flags = CCW_FLAG_IDA;
3409 idaw = idal_create_words(idaw, rdc_buffer, rdc_buffer_size);
3410 } else {
3411 ccw->cda = (__u32)(addr_t) rdc_buffer;
3412 ccw->flags = 0;
3413 }
Cornelia Huck17283b52007-05-04 18:47:51 +02003414
Stefan Haberlandd9fa9442009-10-14 12:43:48 +02003415 ccw->count = rdc_buffer_size;
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01003416 cqr->startdev = device;
3417 cqr->memdev = device;
Cornelia Huck17283b52007-05-04 18:47:51 +02003418 cqr->expires = 10*HZ;
Stefan Weinhubereb6e1992009-12-07 12:51:51 +01003419 cqr->retries = 256;
Cornelia Huck17283b52007-05-04 18:47:51 +02003420 cqr->buildclk = get_clock();
3421 cqr->status = DASD_CQR_FILLED;
3422 return cqr;
3423}
3424
3425
Stefan Haberland68b781f2009-09-11 10:28:29 +02003426int dasd_generic_read_dev_chars(struct dasd_device *device, int magic,
Sebastian Ott92636b12009-06-12 10:26:37 +02003427 void *rdc_buffer, int rdc_buffer_size)
Cornelia Huck17283b52007-05-04 18:47:51 +02003428{
3429 int ret;
3430 struct dasd_ccw_req *cqr;
3431
Sebastian Ott92636b12009-06-12 10:26:37 +02003432 cqr = dasd_generic_build_rdc(device, rdc_buffer, rdc_buffer_size,
Cornelia Huck17283b52007-05-04 18:47:51 +02003433 magic);
3434 if (IS_ERR(cqr))
3435 return PTR_ERR(cqr);
3436
3437 ret = dasd_sleep_on(cqr);
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01003438 dasd_sfree_request(cqr, cqr->memdev);
Cornelia Huck17283b52007-05-04 18:47:51 +02003439 return ret;
3440}
Cornelia Huckaaff0f62007-05-10 15:45:45 +02003441EXPORT_SYMBOL_GPL(dasd_generic_read_dev_chars);
Stefan Weinhuber20c64462006-03-24 03:15:25 -08003442
Stefan Weinhuberf3eb5382009-03-26 15:23:48 +01003443/*
3444 * In command mode and transport mode we need to look for sense
3445 * data in different places. The sense data itself is allways
3446 * an array of 32 bytes, so we can unify the sense data access
3447 * for both modes.
3448 */
3449char *dasd_get_sense(struct irb *irb)
3450{
3451 struct tsb *tsb = NULL;
3452 char *sense = NULL;
3453
3454 if (scsw_is_tm(&irb->scsw) && (irb->scsw.tm.fcxs == 0x01)) {
3455 if (irb->scsw.tm.tcw)
3456 tsb = tcw_get_tsb((struct tcw *)(unsigned long)
3457 irb->scsw.tm.tcw);
3458 if (tsb && tsb->length == 64 && tsb->flags)
3459 switch (tsb->flags & 0x07) {
3460 case 1: /* tsa_iostat */
3461 sense = tsb->tsa.iostat.sense;
3462 break;
3463 case 2: /* tsa_ddpc */
3464 sense = tsb->tsa.ddpc.sense;
3465 break;
3466 default:
3467 /* currently we don't use interrogate data */
3468 break;
3469 }
3470 } else if (irb->esw.esw0.erw.cons) {
3471 sense = irb->ecw;
3472 }
3473 return sense;
3474}
3475EXPORT_SYMBOL_GPL(dasd_get_sense);
3476
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01003477static int __init dasd_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003478{
3479 int rc;
3480
3481 init_waitqueue_head(&dasd_init_waitq);
Horst Hummel8f617012006-08-30 14:33:33 +02003482 init_waitqueue_head(&dasd_flush_wq);
Stefan Haberlandc80ee722008-05-30 10:03:31 +02003483 init_waitqueue_head(&generic_waitq);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003484
3485 /* register 'common' DASD debug area, used for all DBF_XXX calls */
Peter Tiedemann361f4942008-01-26 14:11:30 +01003486 dasd_debug_area = debug_register("dasd", 1, 1, 8 * sizeof(long));
Linus Torvalds1da177e2005-04-16 15:20:36 -07003487 if (dasd_debug_area == NULL) {
3488 rc = -ENOMEM;
3489 goto failed;
3490 }
3491 debug_register_view(dasd_debug_area, &debug_sprintf_view);
Horst Hummelb0035f12006-09-20 15:59:07 +02003492 debug_set_level(dasd_debug_area, DBF_WARNING);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003493
3494 DBF_EVENT(DBF_EMERG, "%s", "debug area created");
3495
3496 dasd_diag_discipline_pointer = NULL;
3497
Stefan Weinhuber4fa52aa2011-07-24 10:48:32 +02003498 dasd_statistics_createroot();
3499
Linus Torvalds1da177e2005-04-16 15:20:36 -07003500 rc = dasd_devmap_init();
3501 if (rc)
3502 goto failed;
3503 rc = dasd_gendisk_init();
3504 if (rc)
3505 goto failed;
3506 rc = dasd_parse();
3507 if (rc)
3508 goto failed;
Stefan Weinhuber20c64462006-03-24 03:15:25 -08003509 rc = dasd_eer_init();
3510 if (rc)
3511 goto failed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003512#ifdef CONFIG_PROC_FS
3513 rc = dasd_proc_init();
3514 if (rc)
3515 goto failed;
3516#endif
3517
3518 return 0;
3519failed:
Stefan Haberlandfc19f382009-03-26 15:23:49 +01003520 pr_info("The DASD device driver could not be initialized\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07003521 dasd_exit();
3522 return rc;
3523}
3524
3525module_init(dasd_init);
3526module_exit(dasd_exit);
3527
3528EXPORT_SYMBOL(dasd_debug_area);
3529EXPORT_SYMBOL(dasd_diag_discipline_pointer);
3530
3531EXPORT_SYMBOL(dasd_add_request_head);
3532EXPORT_SYMBOL(dasd_add_request_tail);
3533EXPORT_SYMBOL(dasd_cancel_req);
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01003534EXPORT_SYMBOL(dasd_device_clear_timer);
3535EXPORT_SYMBOL(dasd_block_clear_timer);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003536EXPORT_SYMBOL(dasd_enable_device);
3537EXPORT_SYMBOL(dasd_int_handler);
3538EXPORT_SYMBOL(dasd_kfree_request);
3539EXPORT_SYMBOL(dasd_kick_device);
3540EXPORT_SYMBOL(dasd_kmalloc_request);
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01003541EXPORT_SYMBOL(dasd_schedule_device_bh);
3542EXPORT_SYMBOL(dasd_schedule_block_bh);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003543EXPORT_SYMBOL(dasd_set_target_state);
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01003544EXPORT_SYMBOL(dasd_device_set_timer);
3545EXPORT_SYMBOL(dasd_block_set_timer);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003546EXPORT_SYMBOL(dasd_sfree_request);
3547EXPORT_SYMBOL(dasd_sleep_on);
3548EXPORT_SYMBOL(dasd_sleep_on_immediatly);
3549EXPORT_SYMBOL(dasd_sleep_on_interruptible);
3550EXPORT_SYMBOL(dasd_smalloc_request);
3551EXPORT_SYMBOL(dasd_start_IO);
3552EXPORT_SYMBOL(dasd_term_IO);
3553
3554EXPORT_SYMBOL_GPL(dasd_generic_probe);
3555EXPORT_SYMBOL_GPL(dasd_generic_remove);
3556EXPORT_SYMBOL_GPL(dasd_generic_notify);
3557EXPORT_SYMBOL_GPL(dasd_generic_set_online);
3558EXPORT_SYMBOL_GPL(dasd_generic_set_offline);
Stefan Weinhuber8e09f212008-01-26 14:11:23 +01003559EXPORT_SYMBOL_GPL(dasd_generic_handle_state_change);
3560EXPORT_SYMBOL_GPL(dasd_flush_device_queue);
3561EXPORT_SYMBOL_GPL(dasd_alloc_block);
3562EXPORT_SYMBOL_GPL(dasd_free_block);