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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07002 * Linux on zSeries Channel Measurement Facility support
3 *
Heiko Carstensa53c8fa2012-07-20 11:15:04 +02004 * Copyright IBM Corp. 2000, 2006
Linus Torvalds1da177e2005-04-16 15:20:36 -07005 *
Cornelia Huck94bb0632006-06-29 15:08:41 +02006 * Authors: Arnd Bergmann <arndb@de.ibm.com>
7 * Cornelia Huck <cornelia.huck@de.ibm.com>
Linus Torvalds1da177e2005-04-16 15:20:36 -07008 *
9 * original idea from Natarajan Krishnaswami <nkrishna@us.ibm.com>
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2, or (at your option)
14 * any later version.
15 *
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
20 *
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24 */
25
Michael Ernste6d5a422008-12-25 13:39:36 +010026#define KMSG_COMPONENT "cio"
27#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
28
Linus Torvalds1da177e2005-04-16 15:20:36 -070029#include <linux/bootmem.h>
30#include <linux/device.h>
31#include <linux/init.h>
32#include <linux/list.h>
33#include <linux/module.h>
34#include <linux/moduleparam.h>
Tim Schmielau4e57b682005-10-30 15:03:48 -080035#include <linux/slab.h>
Heiko Carstens1aae0562013-01-30 09:49:40 +010036#include <linux/timex.h> /* get_tod_clock() */
Linus Torvalds1da177e2005-04-16 15:20:36 -070037
38#include <asm/ccwdev.h>
39#include <asm/cio.h>
40#include <asm/cmb.h>
Tim Schmielau4e57b682005-10-30 15:03:48 -080041#include <asm/div64.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070042
43#include "cio.h"
44#include "css.h"
45#include "device.h"
46#include "ioasm.h"
47#include "chsc.h"
48
Cornelia Huckfc5019c2007-10-12 16:11:15 +020049/*
50 * parameter to enable cmf during boot, possible uses are:
Linus Torvalds1da177e2005-04-16 15:20:36 -070051 * "s390cmf" -- enable cmf and allocate 2 MB of ram so measuring can be
52 * used on any subchannel
53 * "s390cmf=<num>" -- enable cmf and allocate enough memory to measure
54 * <num> subchannel, where <num> is an integer
55 * between 1 and 65535, default is 1024
56 */
57#define ARGSTRING "s390cmf"
58
59/* indices for READCMB */
60enum cmb_index {
61 /* basic and exended format: */
62 cmb_ssch_rsch_count,
63 cmb_sample_count,
64 cmb_device_connect_time,
65 cmb_function_pending_time,
66 cmb_device_disconnect_time,
67 cmb_control_unit_queuing_time,
68 cmb_device_active_only_time,
69 /* extended format only: */
70 cmb_device_busy_time,
71 cmb_initial_command_response_time,
72};
73
74/**
75 * enum cmb_format - types of supported measurement block formats
76 *
77 * @CMF_BASIC: traditional channel measurement blocks supported
Cornelia Huckc0208712007-10-12 16:11:16 +020078 * by all machines that we run on
Linus Torvalds1da177e2005-04-16 15:20:36 -070079 * @CMF_EXTENDED: improved format that was introduced with the z990
Cornelia Huckc0208712007-10-12 16:11:16 +020080 * machine
81 * @CMF_AUTODETECT: default: use extended format when running on a machine
82 * supporting extended format, otherwise fall back to
83 * basic format
84 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070085enum cmb_format {
86 CMF_BASIC,
87 CMF_EXTENDED,
88 CMF_AUTODETECT = -1,
89};
Cornelia Huckfc5019c2007-10-12 16:11:15 +020090
Cornelia Huckc0208712007-10-12 16:11:16 +020091/*
Linus Torvalds1da177e2005-04-16 15:20:36 -070092 * format - actual format for all measurement blocks
93 *
94 * The format module parameter can be set to a value of 0 (zero)
95 * or 1, indicating basic or extended format as described for
96 * enum cmb_format.
97 */
98static int format = CMF_AUTODETECT;
Rusty Russell69116f22012-01-13 09:32:17 +103099module_param(format, bint, 0444);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100
101/**
102 * struct cmb_operations - functions to use depending on cmb_format
103 *
Cornelia Huck94bb0632006-06-29 15:08:41 +0200104 * Most of these functions operate on a struct ccw_device. There is only
105 * one instance of struct cmb_operations because the format of the measurement
106 * data is guaranteed to be the same for every ccw_device.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107 *
108 * @alloc: allocate memory for a channel measurement block,
109 * either with the help of a special pool or with kmalloc
110 * @free: free memory allocated with @alloc
111 * @set: enable or disable measurement
Cornelia Huckc0208712007-10-12 16:11:16 +0200112 * @read: read a measurement entry at an index
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113 * @readall: read a measurement block in a common format
114 * @reset: clear the data in the associated measurement block and
115 * reset its time stamp
116 */
117struct cmb_operations {
Cornelia Huckfc5019c2007-10-12 16:11:15 +0200118 int (*alloc) (struct ccw_device *);
119 void (*free) (struct ccw_device *);
120 int (*set) (struct ccw_device *, u32);
121 u64 (*read) (struct ccw_device *, int);
122 int (*readall)(struct ccw_device *, struct cmbdata *);
123 void (*reset) (struct ccw_device *);
Cornelia Huckc0208712007-10-12 16:11:16 +0200124/* private: */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125 struct attribute_group *attr_group;
126};
127static struct cmb_operations *cmbops;
128
Cornelia Huck94bb0632006-06-29 15:08:41 +0200129struct cmb_data {
130 void *hw_block; /* Pointer to block updated by hardware */
131 void *last_block; /* Last changed block copied from hardware block */
132 int size; /* Size of hw_block and last_block */
133 unsigned long long last_update; /* when last_block was updated */
134};
135
Cornelia Huckfc5019c2007-10-12 16:11:15 +0200136/*
137 * Our user interface is designed in terms of nanoseconds,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138 * while the hardware measures total times in its own
Cornelia Huckfc5019c2007-10-12 16:11:15 +0200139 * unit.
140 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141static inline u64 time_to_nsec(u32 value)
142{
143 return ((u64)value) * 128000ull;
144}
145
146/*
147 * Users are usually interested in average times,
148 * not accumulated time.
149 * This also helps us with atomicity problems
150 * when reading sinlge values.
151 */
152static inline u64 time_to_avg_nsec(u32 value, u32 count)
153{
154 u64 ret;
155
156 /* no samples yet, avoid division by 0 */
157 if (count == 0)
158 return 0;
159
Jan Engelhardt96de0e22007-10-19 23:21:04 +0200160 /* value comes in units of 128 µsec */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161 ret = time_to_nsec(value);
162 do_div(ret, count);
163
164 return ret;
165}
166
Cornelia Huckfc5019c2007-10-12 16:11:15 +0200167/*
168 * Activate or deactivate the channel monitor. When area is NULL,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169 * the monitor is deactivated. The channel monitor needs to
170 * be active in order to measure subchannels, which also need
Cornelia Huckfc5019c2007-10-12 16:11:15 +0200171 * to be enabled.
172 */
173static inline void cmf_activate(void *area, unsigned int onoff)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174{
175 register void * __gpr2 asm("2");
176 register long __gpr1 asm("1");
177
178 __gpr2 = area;
179 __gpr1 = onoff ? 2 : 0;
180 /* activate channel measurement */
181 asm("schm" : : "d" (__gpr2), "d" (__gpr1) );
182}
183
Cornelia Huckfc5019c2007-10-12 16:11:15 +0200184static int set_schib(struct ccw_device *cdev, u32 mme, int mbfc,
185 unsigned long address)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186{
Sebastian Otta6ef1562015-09-07 19:51:39 +0200187 struct subchannel *sch = to_subchannel(cdev->dev.parent);
188 int ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700189
Sebastian Ott13952ec2008-12-25 13:39:13 +0100190 sch->config.mme = mme;
191 sch->config.mbfc = mbfc;
192 /* address can be either a block address or a block index */
193 if (mbfc)
194 sch->config.mba = address;
195 else
196 sch->config.mbi = address;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197
Sebastian Otta6ef1562015-09-07 19:51:39 +0200198 ret = cio_commit_config(sch);
199 if (!mme && ret == -ENODEV) {
200 /*
201 * The task was to disable measurement block updates but
202 * the subchannel is already gone. Report success.
203 */
204 ret = 0;
205 }
206 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207}
208
209struct set_schib_struct {
210 u32 mme;
211 int mbfc;
212 unsigned long address;
213 wait_queue_head_t wait;
214 int ret;
Cornelia Huck94bb0632006-06-29 15:08:41 +0200215 struct kref kref;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700216};
217
Cornelia Huck94bb0632006-06-29 15:08:41 +0200218static void cmf_set_schib_release(struct kref *kref)
219{
220 struct set_schib_struct *set_data;
221
222 set_data = container_of(kref, struct set_schib_struct, kref);
223 kfree(set_data);
224}
225
226#define CMF_PENDING 1
227
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228static int set_schib_wait(struct ccw_device *cdev, u32 mme,
229 int mbfc, unsigned long address)
230{
Cornelia Huck94bb0632006-06-29 15:08:41 +0200231 struct set_schib_struct *set_data;
232 int ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233
234 spin_lock_irq(cdev->ccwlock);
Cornelia Huck94bb0632006-06-29 15:08:41 +0200235 if (!cdev->private->cmb) {
236 ret = -ENODEV;
237 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700238 }
Cornelia Huck94bb0632006-06-29 15:08:41 +0200239 set_data = kzalloc(sizeof(struct set_schib_struct), GFP_ATOMIC);
240 if (!set_data) {
241 ret = -ENOMEM;
242 goto out;
243 }
244 init_waitqueue_head(&set_data->wait);
245 kref_init(&set_data->kref);
246 set_data->mme = mme;
247 set_data->mbfc = mbfc;
248 set_data->address = address;
249
250 ret = set_schib(cdev, mme, mbfc, address);
251 if (ret != -EBUSY)
252 goto out_put;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253
254 if (cdev->private->state != DEV_STATE_ONLINE) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700255 /* if the device is not online, don't even try again */
Cornelia Huck94bb0632006-06-29 15:08:41 +0200256 ret = -EBUSY;
257 goto out_put;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700258 }
Cornelia Huck94bb0632006-06-29 15:08:41 +0200259
Linus Torvalds1da177e2005-04-16 15:20:36 -0700260 cdev->private->state = DEV_STATE_CMFCHANGE;
Cornelia Huck94bb0632006-06-29 15:08:41 +0200261 set_data->ret = CMF_PENDING;
262 cdev->private->cmb_wait = set_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700263
264 spin_unlock_irq(cdev->ccwlock);
Cornelia Huck94bb0632006-06-29 15:08:41 +0200265 if (wait_event_interruptible(set_data->wait,
266 set_data->ret != CMF_PENDING)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700267 spin_lock_irq(cdev->ccwlock);
Cornelia Huck94bb0632006-06-29 15:08:41 +0200268 if (set_data->ret == CMF_PENDING) {
269 set_data->ret = -ERESTARTSYS;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700270 if (cdev->private->state == DEV_STATE_CMFCHANGE)
271 cdev->private->state = DEV_STATE_ONLINE;
272 }
273 spin_unlock_irq(cdev->ccwlock);
274 }
Cornelia Huck94bb0632006-06-29 15:08:41 +0200275 spin_lock_irq(cdev->ccwlock);
276 cdev->private->cmb_wait = NULL;
277 ret = set_data->ret;
278out_put:
279 kref_put(&set_data->kref, cmf_set_schib_release);
280out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700281 spin_unlock_irq(cdev->ccwlock);
Cornelia Huck94bb0632006-06-29 15:08:41 +0200282 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700283}
284
285void retry_set_schib(struct ccw_device *cdev)
286{
Cornelia Huck94bb0632006-06-29 15:08:41 +0200287 struct set_schib_struct *set_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288
Cornelia Huck94bb0632006-06-29 15:08:41 +0200289 set_data = cdev->private->cmb_wait;
290 if (!set_data) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291 WARN_ON(1);
292 return;
293 }
Cornelia Huck94bb0632006-06-29 15:08:41 +0200294 kref_get(&set_data->kref);
295 set_data->ret = set_schib(cdev, set_data->mme, set_data->mbfc,
296 set_data->address);
297 wake_up(&set_data->wait);
298 kref_put(&set_data->kref, cmf_set_schib_release);
299}
300
301static int cmf_copy_block(struct ccw_device *cdev)
302{
303 struct subchannel *sch;
304 void *reference_buf;
305 void *hw_block;
306 struct cmb_data *cmb_data;
307
308 sch = to_subchannel(cdev->dev.parent);
309
Sebastian Ottcdb912a2008-12-25 13:39:12 +0100310 if (cio_update_schib(sch))
Cornelia Huck94bb0632006-06-29 15:08:41 +0200311 return -ENODEV;
312
Peter Oberparleiter23d805b2008-07-14 09:58:50 +0200313 if (scsw_fctl(&sch->schib.scsw) & SCSW_FCTL_START_FUNC) {
Cornelia Huck94bb0632006-06-29 15:08:41 +0200314 /* Don't copy if a start function is in progress. */
Peter Oberparleiter23d805b2008-07-14 09:58:50 +0200315 if ((!(scsw_actl(&sch->schib.scsw) & SCSW_ACTL_SUSPENDED)) &&
316 (scsw_actl(&sch->schib.scsw) &
Cornelia Huck94bb0632006-06-29 15:08:41 +0200317 (SCSW_ACTL_DEVACT | SCSW_ACTL_SCHACT)) &&
Peter Oberparleiter23d805b2008-07-14 09:58:50 +0200318 (!(scsw_stctl(&sch->schib.scsw) & SCSW_STCTL_SEC_STATUS)))
Cornelia Huck94bb0632006-06-29 15:08:41 +0200319 return -EBUSY;
320 }
321 cmb_data = cdev->private->cmb;
Sebastian Ott45bf4b92015-09-07 19:53:01 +0200322 hw_block = cmb_data->hw_block;
Cornelia Huck94bb0632006-06-29 15:08:41 +0200323 if (!memcmp(cmb_data->last_block, hw_block, cmb_data->size))
324 /* No need to copy. */
325 return 0;
326 reference_buf = kzalloc(cmb_data->size, GFP_ATOMIC);
327 if (!reference_buf)
328 return -ENOMEM;
329 /* Ensure consistency of block copied from hardware. */
330 do {
331 memcpy(cmb_data->last_block, hw_block, cmb_data->size);
332 memcpy(reference_buf, hw_block, cmb_data->size);
333 } while (memcmp(cmb_data->last_block, reference_buf, cmb_data->size));
Heiko Carstens1aae0562013-01-30 09:49:40 +0100334 cmb_data->last_update = get_tod_clock();
Cornelia Huck94bb0632006-06-29 15:08:41 +0200335 kfree(reference_buf);
336 return 0;
337}
338
339struct copy_block_struct {
340 wait_queue_head_t wait;
341 int ret;
342 struct kref kref;
343};
344
345static void cmf_copy_block_release(struct kref *kref)
346{
347 struct copy_block_struct *copy_block;
348
349 copy_block = container_of(kref, struct copy_block_struct, kref);
350 kfree(copy_block);
351}
352
353static int cmf_cmb_copy_wait(struct ccw_device *cdev)
354{
355 struct copy_block_struct *copy_block;
356 int ret;
357 unsigned long flags;
358
359 spin_lock_irqsave(cdev->ccwlock, flags);
360 if (!cdev->private->cmb) {
361 ret = -ENODEV;
362 goto out;
363 }
364 copy_block = kzalloc(sizeof(struct copy_block_struct), GFP_ATOMIC);
365 if (!copy_block) {
366 ret = -ENOMEM;
367 goto out;
368 }
369 init_waitqueue_head(&copy_block->wait);
370 kref_init(&copy_block->kref);
371
372 ret = cmf_copy_block(cdev);
373 if (ret != -EBUSY)
374 goto out_put;
375
376 if (cdev->private->state != DEV_STATE_ONLINE) {
377 ret = -EBUSY;
378 goto out_put;
379 }
380
381 cdev->private->state = DEV_STATE_CMFUPDATE;
382 copy_block->ret = CMF_PENDING;
383 cdev->private->cmb_wait = copy_block;
384
385 spin_unlock_irqrestore(cdev->ccwlock, flags);
386 if (wait_event_interruptible(copy_block->wait,
387 copy_block->ret != CMF_PENDING)) {
388 spin_lock_irqsave(cdev->ccwlock, flags);
389 if (copy_block->ret == CMF_PENDING) {
390 copy_block->ret = -ERESTARTSYS;
391 if (cdev->private->state == DEV_STATE_CMFUPDATE)
392 cdev->private->state = DEV_STATE_ONLINE;
393 }
394 spin_unlock_irqrestore(cdev->ccwlock, flags);
395 }
396 spin_lock_irqsave(cdev->ccwlock, flags);
397 cdev->private->cmb_wait = NULL;
398 ret = copy_block->ret;
399out_put:
400 kref_put(&copy_block->kref, cmf_copy_block_release);
401out:
402 spin_unlock_irqrestore(cdev->ccwlock, flags);
403 return ret;
404}
405
406void cmf_retry_copy_block(struct ccw_device *cdev)
407{
408 struct copy_block_struct *copy_block;
409
410 copy_block = cdev->private->cmb_wait;
411 if (!copy_block) {
412 WARN_ON(1);
413 return;
414 }
415 kref_get(&copy_block->kref);
416 copy_block->ret = cmf_copy_block(cdev);
417 wake_up(&copy_block->wait);
418 kref_put(&copy_block->kref, cmf_copy_block_release);
419}
420
421static void cmf_generic_reset(struct ccw_device *cdev)
422{
423 struct cmb_data *cmb_data;
424
425 spin_lock_irq(cdev->ccwlock);
426 cmb_data = cdev->private->cmb;
427 if (cmb_data) {
428 memset(cmb_data->last_block, 0, cmb_data->size);
429 /*
430 * Need to reset hw block as well to make the hardware start
431 * from 0 again.
432 */
Sebastian Ott45bf4b92015-09-07 19:53:01 +0200433 memset(cmb_data->hw_block, 0, cmb_data->size);
Cornelia Huck94bb0632006-06-29 15:08:41 +0200434 cmb_data->last_update = 0;
435 }
Heiko Carstens1aae0562013-01-30 09:49:40 +0100436 cdev->private->cmb_start_time = get_tod_clock();
Cornelia Huck94bb0632006-06-29 15:08:41 +0200437 spin_unlock_irq(cdev->ccwlock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700438}
439
440/**
441 * struct cmb_area - container for global cmb data
442 *
443 * @mem: pointer to CMBs (only in basic measurement mode)
444 * @list: contains a linked list of all subchannels
Cornelia Huckc0208712007-10-12 16:11:16 +0200445 * @num_channels: number of channels to be measured
Linus Torvalds1da177e2005-04-16 15:20:36 -0700446 * @lock: protect concurrent access to @mem and @list
447 */
448struct cmb_area {
449 struct cmb *mem;
450 struct list_head list;
451 int num_channels;
452 spinlock_t lock;
453};
454
455static struct cmb_area cmb_area = {
Milind Arun Choudharycb629a02007-04-27 16:02:01 +0200456 .lock = __SPIN_LOCK_UNLOCKED(cmb_area.lock),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700457 .list = LIST_HEAD_INIT(cmb_area.list),
458 .num_channels = 1024,
459};
460
Linus Torvalds1da177e2005-04-16 15:20:36 -0700461/* ****** old style CMB handling ********/
462
Cornelia Huckfc5019c2007-10-12 16:11:15 +0200463/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700464 * Basic channel measurement blocks are allocated in one contiguous
465 * block of memory, which can not be moved as long as any channel
466 * is active. Therefore, a maximum number of subchannels needs to
467 * be defined somewhere. This is a module parameter, defaulting to
André Goddard Rosaaf901ca2009-11-14 13:09:05 -0200468 * a reasonable value of 1024, or 32 kb of memory.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700469 * Current kernels don't allow kmalloc with more than 128kb, so the
Cornelia Huckfc5019c2007-10-12 16:11:15 +0200470 * maximum is 4096.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700471 */
472
473module_param_named(maxchannels, cmb_area.num_channels, uint, 0444);
474
475/**
476 * struct cmb - basic channel measurement block
Cornelia Huckc0208712007-10-12 16:11:16 +0200477 * @ssch_rsch_count: number of ssch and rsch
478 * @sample_count: number of samples
479 * @device_connect_time: time of device connect
480 * @function_pending_time: time of function pending
481 * @device_disconnect_time: time of device disconnect
482 * @control_unit_queuing_time: time of control unit queuing
483 * @device_active_only_time: time of device active only
484 * @reserved: unused in basic measurement mode
Linus Torvalds1da177e2005-04-16 15:20:36 -0700485 *
Cornelia Huckc0208712007-10-12 16:11:16 +0200486 * The measurement block as used by the hardware. The fields are described
487 * further in z/Architecture Principles of Operation, chapter 17.
488 *
489 * The cmb area made up from these blocks must be a contiguous array and may
490 * not be reallocated or freed.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700491 * Only one cmb area can be present in the system.
492 */
493struct cmb {
494 u16 ssch_rsch_count;
495 u16 sample_count;
496 u32 device_connect_time;
497 u32 function_pending_time;
498 u32 device_disconnect_time;
499 u32 control_unit_queuing_time;
500 u32 device_active_only_time;
501 u32 reserved[2];
502};
503
Cornelia Huckfc5019c2007-10-12 16:11:15 +0200504/*
505 * Insert a single device into the cmb_area list.
506 * Called with cmb_area.lock held from alloc_cmb.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700507 */
Heiko Carstens4d284ca2007-02-05 21:18:53 +0100508static int alloc_cmb_single(struct ccw_device *cdev,
509 struct cmb_data *cmb_data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700510{
511 struct cmb *cmb;
512 struct ccw_device_private *node;
513 int ret;
514
515 spin_lock_irq(cdev->ccwlock);
516 if (!list_empty(&cdev->private->cmb_list)) {
517 ret = -EBUSY;
518 goto out;
519 }
520
Cornelia Huckfc5019c2007-10-12 16:11:15 +0200521 /*
522 * Find first unused cmb in cmb_area.mem.
523 * This is a little tricky: cmb_area.list
524 * remains sorted by ->cmb->hw_data pointers.
525 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700526 cmb = cmb_area.mem;
527 list_for_each_entry(node, &cmb_area.list, cmb_list) {
Cornelia Huck94bb0632006-06-29 15:08:41 +0200528 struct cmb_data *data;
529 data = node->cmb;
530 if ((struct cmb*)data->hw_block > cmb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700531 break;
532 cmb++;
533 }
534 if (cmb - cmb_area.mem >= cmb_area.num_channels) {
535 ret = -ENOMEM;
536 goto out;
537 }
538
539 /* insert new cmb */
540 list_add_tail(&cdev->private->cmb_list, &node->cmb_list);
Cornelia Huck94bb0632006-06-29 15:08:41 +0200541 cmb_data->hw_block = cmb;
542 cdev->private->cmb = cmb_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700543 ret = 0;
544out:
545 spin_unlock_irq(cdev->ccwlock);
546 return ret;
547}
548
Cornelia Huckfc5019c2007-10-12 16:11:15 +0200549static int alloc_cmb(struct ccw_device *cdev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700550{
551 int ret;
552 struct cmb *mem;
553 ssize_t size;
Cornelia Huck94bb0632006-06-29 15:08:41 +0200554 struct cmb_data *cmb_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700555
Cornelia Huck94bb0632006-06-29 15:08:41 +0200556 /* Allocate private cmb_data. */
557 cmb_data = kzalloc(sizeof(struct cmb_data), GFP_KERNEL);
558 if (!cmb_data)
559 return -ENOMEM;
560
561 cmb_data->last_block = kzalloc(sizeof(struct cmb), GFP_KERNEL);
562 if (!cmb_data->last_block) {
563 kfree(cmb_data);
564 return -ENOMEM;
565 }
566 cmb_data->size = sizeof(struct cmb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700567 spin_lock(&cmb_area.lock);
568
569 if (!cmb_area.mem) {
570 /* there is no user yet, so we need a new area */
571 size = sizeof(struct cmb) * cmb_area.num_channels;
572 WARN_ON(!list_empty(&cmb_area.list));
573
574 spin_unlock(&cmb_area.lock);
575 mem = (void*)__get_free_pages(GFP_KERNEL | GFP_DMA,
576 get_order(size));
577 spin_lock(&cmb_area.lock);
578
579 if (cmb_area.mem) {
580 /* ok, another thread was faster */
581 free_pages((unsigned long)mem, get_order(size));
582 } else if (!mem) {
583 /* no luck */
584 ret = -ENOMEM;
585 goto out;
586 } else {
587 /* everything ok */
588 memset(mem, 0, size);
589 cmb_area.mem = mem;
590 cmf_activate(cmb_area.mem, 1);
591 }
592 }
593
594 /* do the actual allocation */
Cornelia Huck94bb0632006-06-29 15:08:41 +0200595 ret = alloc_cmb_single(cdev, cmb_data);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700596out:
597 spin_unlock(&cmb_area.lock);
Cornelia Huck94bb0632006-06-29 15:08:41 +0200598 if (ret) {
599 kfree(cmb_data->last_block);
600 kfree(cmb_data);
601 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700602 return ret;
603}
604
Cornelia Huck94bb0632006-06-29 15:08:41 +0200605static void free_cmb(struct ccw_device *cdev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700606{
607 struct ccw_device_private *priv;
Cornelia Huck94bb0632006-06-29 15:08:41 +0200608 struct cmb_data *cmb_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700609
610 spin_lock(&cmb_area.lock);
611 spin_lock_irq(cdev->ccwlock);
612
Cornelia Huck94bb0632006-06-29 15:08:41 +0200613 priv = cdev->private;
Cornelia Huck94bb0632006-06-29 15:08:41 +0200614 cmb_data = priv->cmb;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700615 priv->cmb = NULL;
Cornelia Huck94bb0632006-06-29 15:08:41 +0200616 if (cmb_data)
617 kfree(cmb_data->last_block);
618 kfree(cmb_data);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700619 list_del_init(&priv->cmb_list);
620
621 if (list_empty(&cmb_area.list)) {
622 ssize_t size;
623 size = sizeof(struct cmb) * cmb_area.num_channels;
624 cmf_activate(NULL, 0);
625 free_pages((unsigned long)cmb_area.mem, get_order(size));
626 cmb_area.mem = NULL;
627 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700628 spin_unlock_irq(cdev->ccwlock);
629 spin_unlock(&cmb_area.lock);
630}
631
Cornelia Huck94bb0632006-06-29 15:08:41 +0200632static int set_cmb(struct ccw_device *cdev, u32 mme)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700633{
634 u16 offset;
Cornelia Huck94bb0632006-06-29 15:08:41 +0200635 struct cmb_data *cmb_data;
636 unsigned long flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700637
Cornelia Huck94bb0632006-06-29 15:08:41 +0200638 spin_lock_irqsave(cdev->ccwlock, flags);
639 if (!cdev->private->cmb) {
640 spin_unlock_irqrestore(cdev->ccwlock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700641 return -EINVAL;
Cornelia Huck94bb0632006-06-29 15:08:41 +0200642 }
643 cmb_data = cdev->private->cmb;
644 offset = mme ? (struct cmb *)cmb_data->hw_block - cmb_area.mem : 0;
645 spin_unlock_irqrestore(cdev->ccwlock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700646
647 return set_schib_wait(cdev, mme, 0, offset);
648}
649
Cornelia Huckfc5019c2007-10-12 16:11:15 +0200650static u64 read_cmb(struct ccw_device *cdev, int index)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700651{
Cornelia Huck94bb0632006-06-29 15:08:41 +0200652 struct cmb *cmb;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700653 u32 val;
Cornelia Huck94bb0632006-06-29 15:08:41 +0200654 int ret;
655 unsigned long flags;
656
657 ret = cmf_cmb_copy_wait(cdev);
658 if (ret < 0)
659 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700660
661 spin_lock_irqsave(cdev->ccwlock, flags);
662 if (!cdev->private->cmb) {
Cornelia Huck94bb0632006-06-29 15:08:41 +0200663 ret = 0;
664 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700665 }
Cornelia Huck94bb0632006-06-29 15:08:41 +0200666 cmb = ((struct cmb_data *)cdev->private->cmb)->last_block;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700667
668 switch (index) {
669 case cmb_ssch_rsch_count:
Cornelia Huck94bb0632006-06-29 15:08:41 +0200670 ret = cmb->ssch_rsch_count;
671 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700672 case cmb_sample_count:
Cornelia Huck94bb0632006-06-29 15:08:41 +0200673 ret = cmb->sample_count;
674 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700675 case cmb_device_connect_time:
Cornelia Huck94bb0632006-06-29 15:08:41 +0200676 val = cmb->device_connect_time;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700677 break;
678 case cmb_function_pending_time:
Cornelia Huck94bb0632006-06-29 15:08:41 +0200679 val = cmb->function_pending_time;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700680 break;
681 case cmb_device_disconnect_time:
Cornelia Huck94bb0632006-06-29 15:08:41 +0200682 val = cmb->device_disconnect_time;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700683 break;
684 case cmb_control_unit_queuing_time:
Cornelia Huck94bb0632006-06-29 15:08:41 +0200685 val = cmb->control_unit_queuing_time;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700686 break;
687 case cmb_device_active_only_time:
Cornelia Huck94bb0632006-06-29 15:08:41 +0200688 val = cmb->device_active_only_time;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700689 break;
690 default:
Cornelia Huck94bb0632006-06-29 15:08:41 +0200691 ret = 0;
692 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700693 }
Cornelia Huck94bb0632006-06-29 15:08:41 +0200694 ret = time_to_avg_nsec(val, cmb->sample_count);
695out:
696 spin_unlock_irqrestore(cdev->ccwlock, flags);
697 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700698}
699
Cornelia Huckfc5019c2007-10-12 16:11:15 +0200700static int readall_cmb(struct ccw_device *cdev, struct cmbdata *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700701{
Cornelia Huck94bb0632006-06-29 15:08:41 +0200702 struct cmb *cmb;
703 struct cmb_data *cmb_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700704 u64 time;
Cornelia Huck94bb0632006-06-29 15:08:41 +0200705 unsigned long flags;
706 int ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700707
Cornelia Huck94bb0632006-06-29 15:08:41 +0200708 ret = cmf_cmb_copy_wait(cdev);
709 if (ret < 0)
710 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700711 spin_lock_irqsave(cdev->ccwlock, flags);
Cornelia Huck94bb0632006-06-29 15:08:41 +0200712 cmb_data = cdev->private->cmb;
713 if (!cmb_data) {
714 ret = -ENODEV;
715 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700716 }
Cornelia Huck94bb0632006-06-29 15:08:41 +0200717 if (cmb_data->last_update == 0) {
718 ret = -EAGAIN;
719 goto out;
720 }
721 cmb = cmb_data->last_block;
722 time = cmb_data->last_update - cdev->private->cmb_start_time;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700723
724 memset(data, 0, sizeof(struct cmbdata));
725
726 /* we only know values before device_busy_time */
727 data->size = offsetof(struct cmbdata, device_busy_time);
728
729 /* convert to nanoseconds */
730 data->elapsed_time = (time * 1000) >> 12;
731
732 /* copy data to new structure */
Cornelia Huck94bb0632006-06-29 15:08:41 +0200733 data->ssch_rsch_count = cmb->ssch_rsch_count;
734 data->sample_count = cmb->sample_count;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700735
736 /* time fields are converted to nanoseconds while copying */
Cornelia Huck94bb0632006-06-29 15:08:41 +0200737 data->device_connect_time = time_to_nsec(cmb->device_connect_time);
738 data->function_pending_time = time_to_nsec(cmb->function_pending_time);
739 data->device_disconnect_time =
740 time_to_nsec(cmb->device_disconnect_time);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700741 data->control_unit_queuing_time
Cornelia Huck94bb0632006-06-29 15:08:41 +0200742 = time_to_nsec(cmb->control_unit_queuing_time);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700743 data->device_active_only_time
Cornelia Huck94bb0632006-06-29 15:08:41 +0200744 = time_to_nsec(cmb->device_active_only_time);
745 ret = 0;
746out:
747 spin_unlock_irqrestore(cdev->ccwlock, flags);
748 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700749}
750
Cornelia Huck94bb0632006-06-29 15:08:41 +0200751static void reset_cmb(struct ccw_device *cdev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700752{
Cornelia Huck94bb0632006-06-29 15:08:41 +0200753 cmf_generic_reset(cdev);
754}
755
Linus Torvalds1da177e2005-04-16 15:20:36 -0700756static struct attribute_group cmf_attr_group;
757
758static struct cmb_operations cmbops_basic = {
759 .alloc = alloc_cmb,
760 .free = free_cmb,
761 .set = set_cmb,
762 .read = read_cmb,
763 .readall = readall_cmb,
764 .reset = reset_cmb,
765 .attr_group = &cmf_attr_group,
766};
Heiko Carstens364c8552007-10-12 16:11:35 +0200767
Linus Torvalds1da177e2005-04-16 15:20:36 -0700768/* ******** extended cmb handling ********/
769
770/**
771 * struct cmbe - extended channel measurement block
Cornelia Huckc0208712007-10-12 16:11:16 +0200772 * @ssch_rsch_count: number of ssch and rsch
773 * @sample_count: number of samples
774 * @device_connect_time: time of device connect
775 * @function_pending_time: time of function pending
776 * @device_disconnect_time: time of device disconnect
777 * @control_unit_queuing_time: time of control unit queuing
778 * @device_active_only_time: time of device active only
779 * @device_busy_time: time of device busy
780 * @initial_command_response_time: initial command response time
781 * @reserved: unused
Linus Torvalds1da177e2005-04-16 15:20:36 -0700782 *
Cornelia Huckc0208712007-10-12 16:11:16 +0200783 * The measurement block as used by the hardware. May be in any 64 bit physical
784 * location.
785 * The fields are described further in z/Architecture Principles of Operation,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700786 * third edition, chapter 17.
787 */
788struct cmbe {
789 u32 ssch_rsch_count;
790 u32 sample_count;
791 u32 device_connect_time;
792 u32 function_pending_time;
793 u32 device_disconnect_time;
794 u32 control_unit_queuing_time;
795 u32 device_active_only_time;
796 u32 device_busy_time;
797 u32 initial_command_response_time;
798 u32 reserved[7];
Sebastian Ott45bf4b92015-09-07 19:53:01 +0200799} __packed __aligned(64);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700800
Sebastian Ott45bf4b92015-09-07 19:53:01 +0200801static struct kmem_cache *cmbe_cache;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700802
Cornelia Huckfc5019c2007-10-12 16:11:15 +0200803static int alloc_cmbe(struct ccw_device *cdev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700804{
Cornelia Huck94bb0632006-06-29 15:08:41 +0200805 struct cmb_data *cmb_data;
Sebastian Ott616503d2015-09-07 19:52:06 +0200806 struct cmbe *cmbe;
807 int ret = -ENOMEM;
Cornelia Huck94bb0632006-06-29 15:08:41 +0200808
Sebastian Ott45bf4b92015-09-07 19:53:01 +0200809 cmbe = kmem_cache_zalloc(cmbe_cache, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700810 if (!cmbe)
Sebastian Ott616503d2015-09-07 19:52:06 +0200811 return ret;
812
Sebastian Ott45bf4b92015-09-07 19:53:01 +0200813 cmb_data = kzalloc(sizeof(*cmb_data), GFP_KERNEL);
Sebastian Ott616503d2015-09-07 19:52:06 +0200814 if (!cmb_data)
Cornelia Huck94bb0632006-06-29 15:08:41 +0200815 goto out_free;
Sebastian Ott616503d2015-09-07 19:52:06 +0200816
Cornelia Huck94bb0632006-06-29 15:08:41 +0200817 cmb_data->last_block = kzalloc(sizeof(struct cmbe), GFP_KERNEL);
Sebastian Ott616503d2015-09-07 19:52:06 +0200818 if (!cmb_data->last_block)
Cornelia Huck94bb0632006-06-29 15:08:41 +0200819 goto out_free;
Sebastian Ott616503d2015-09-07 19:52:06 +0200820
Sebastian Ott45bf4b92015-09-07 19:53:01 +0200821 cmb_data->size = sizeof(*cmbe);
Cornelia Huck94bb0632006-06-29 15:08:41 +0200822 cmb_data->hw_block = cmbe;
Sebastian Ott616503d2015-09-07 19:52:06 +0200823
824 spin_lock(&cmb_area.lock);
825 spin_lock_irq(cdev->ccwlock);
826 if (cdev->private->cmb)
827 goto out_unlock;
828
Cornelia Huck94bb0632006-06-29 15:08:41 +0200829 cdev->private->cmb = cmb_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700830
831 /* activate global measurement if this is the first channel */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700832 if (list_empty(&cmb_area.list))
833 cmf_activate(NULL, 1);
834 list_add_tail(&cdev->private->cmb_list, &cmb_area.list);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700835
Sebastian Ott616503d2015-09-07 19:52:06 +0200836 spin_unlock_irq(cdev->ccwlock);
837 spin_unlock(&cmb_area.lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700838 return 0;
Sebastian Ott616503d2015-09-07 19:52:06 +0200839
840out_unlock:
841 spin_unlock_irq(cdev->ccwlock);
842 spin_unlock(&cmb_area.lock);
843 ret = -EBUSY;
Cornelia Huck94bb0632006-06-29 15:08:41 +0200844out_free:
845 if (cmb_data)
846 kfree(cmb_data->last_block);
847 kfree(cmb_data);
Sebastian Ott45bf4b92015-09-07 19:53:01 +0200848 kmem_cache_free(cmbe_cache, cmbe);
849
Cornelia Huck94bb0632006-06-29 15:08:41 +0200850 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700851}
852
Cornelia Huckfc5019c2007-10-12 16:11:15 +0200853static void free_cmbe(struct ccw_device *cdev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700854{
Cornelia Huck94bb0632006-06-29 15:08:41 +0200855 struct cmb_data *cmb_data;
856
Sebastian Ott616503d2015-09-07 19:52:06 +0200857 spin_lock(&cmb_area.lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700858 spin_lock_irq(cdev->ccwlock);
Cornelia Huck94bb0632006-06-29 15:08:41 +0200859 cmb_data = cdev->private->cmb;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700860 cdev->private->cmb = NULL;
Sebastian Otta5e9ca52015-09-07 19:52:31 +0200861 if (cmb_data) {
Cornelia Huck94bb0632006-06-29 15:08:41 +0200862 kfree(cmb_data->last_block);
Sebastian Ott45bf4b92015-09-07 19:53:01 +0200863 kmem_cache_free(cmbe_cache, cmb_data->hw_block);
Sebastian Otta5e9ca52015-09-07 19:52:31 +0200864 }
Cornelia Huck94bb0632006-06-29 15:08:41 +0200865 kfree(cmb_data);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700866
867 /* deactivate global measurement if this is the last channel */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700868 list_del_init(&cdev->private->cmb_list);
869 if (list_empty(&cmb_area.list))
870 cmf_activate(NULL, 0);
Sebastian Ott616503d2015-09-07 19:52:06 +0200871 spin_unlock_irq(cdev->ccwlock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700872 spin_unlock(&cmb_area.lock);
873}
874
Cornelia Huck94bb0632006-06-29 15:08:41 +0200875static int set_cmbe(struct ccw_device *cdev, u32 mme)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700876{
877 unsigned long mba;
Cornelia Huck94bb0632006-06-29 15:08:41 +0200878 struct cmb_data *cmb_data;
879 unsigned long flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700880
Cornelia Huck94bb0632006-06-29 15:08:41 +0200881 spin_lock_irqsave(cdev->ccwlock, flags);
882 if (!cdev->private->cmb) {
883 spin_unlock_irqrestore(cdev->ccwlock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700884 return -EINVAL;
Cornelia Huck94bb0632006-06-29 15:08:41 +0200885 }
886 cmb_data = cdev->private->cmb;
Sebastian Ott45bf4b92015-09-07 19:53:01 +0200887 mba = mme ? (unsigned long) cmb_data->hw_block : 0;
Cornelia Huck94bb0632006-06-29 15:08:41 +0200888 spin_unlock_irqrestore(cdev->ccwlock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700889
890 return set_schib_wait(cdev, mme, 1, mba);
891}
892
893
Cornelia Huckfc5019c2007-10-12 16:11:15 +0200894static u64 read_cmbe(struct ccw_device *cdev, int index)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700895{
Cornelia Huck94bb0632006-06-29 15:08:41 +0200896 struct cmbe *cmb;
897 struct cmb_data *cmb_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700898 u32 val;
Cornelia Huck94bb0632006-06-29 15:08:41 +0200899 int ret;
900 unsigned long flags;
901
902 ret = cmf_cmb_copy_wait(cdev);
903 if (ret < 0)
904 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700905
906 spin_lock_irqsave(cdev->ccwlock, flags);
Cornelia Huck94bb0632006-06-29 15:08:41 +0200907 cmb_data = cdev->private->cmb;
908 if (!cmb_data) {
909 ret = 0;
910 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700911 }
Cornelia Huck94bb0632006-06-29 15:08:41 +0200912 cmb = cmb_data->last_block;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700913
914 switch (index) {
915 case cmb_ssch_rsch_count:
Cornelia Huck94bb0632006-06-29 15:08:41 +0200916 ret = cmb->ssch_rsch_count;
917 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700918 case cmb_sample_count:
Cornelia Huck94bb0632006-06-29 15:08:41 +0200919 ret = cmb->sample_count;
920 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700921 case cmb_device_connect_time:
Cornelia Huck94bb0632006-06-29 15:08:41 +0200922 val = cmb->device_connect_time;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700923 break;
924 case cmb_function_pending_time:
Cornelia Huck94bb0632006-06-29 15:08:41 +0200925 val = cmb->function_pending_time;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700926 break;
927 case cmb_device_disconnect_time:
Cornelia Huck94bb0632006-06-29 15:08:41 +0200928 val = cmb->device_disconnect_time;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700929 break;
930 case cmb_control_unit_queuing_time:
Cornelia Huck94bb0632006-06-29 15:08:41 +0200931 val = cmb->control_unit_queuing_time;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700932 break;
933 case cmb_device_active_only_time:
Cornelia Huck94bb0632006-06-29 15:08:41 +0200934 val = cmb->device_active_only_time;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700935 break;
936 case cmb_device_busy_time:
Cornelia Huck94bb0632006-06-29 15:08:41 +0200937 val = cmb->device_busy_time;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700938 break;
939 case cmb_initial_command_response_time:
Cornelia Huck94bb0632006-06-29 15:08:41 +0200940 val = cmb->initial_command_response_time;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700941 break;
942 default:
Cornelia Huck94bb0632006-06-29 15:08:41 +0200943 ret = 0;
944 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700945 }
Cornelia Huck94bb0632006-06-29 15:08:41 +0200946 ret = time_to_avg_nsec(val, cmb->sample_count);
947out:
948 spin_unlock_irqrestore(cdev->ccwlock, flags);
949 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700950}
951
Cornelia Huckfc5019c2007-10-12 16:11:15 +0200952static int readall_cmbe(struct ccw_device *cdev, struct cmbdata *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700953{
Cornelia Huck94bb0632006-06-29 15:08:41 +0200954 struct cmbe *cmb;
955 struct cmb_data *cmb_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700956 u64 time;
Cornelia Huck94bb0632006-06-29 15:08:41 +0200957 unsigned long flags;
958 int ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700959
Cornelia Huck94bb0632006-06-29 15:08:41 +0200960 ret = cmf_cmb_copy_wait(cdev);
961 if (ret < 0)
962 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700963 spin_lock_irqsave(cdev->ccwlock, flags);
Cornelia Huck94bb0632006-06-29 15:08:41 +0200964 cmb_data = cdev->private->cmb;
965 if (!cmb_data) {
966 ret = -ENODEV;
967 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700968 }
Cornelia Huck94bb0632006-06-29 15:08:41 +0200969 if (cmb_data->last_update == 0) {
970 ret = -EAGAIN;
971 goto out;
972 }
973 time = cmb_data->last_update - cdev->private->cmb_start_time;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700974
975 memset (data, 0, sizeof(struct cmbdata));
976
977 /* we only know values before device_busy_time */
978 data->size = offsetof(struct cmbdata, device_busy_time);
979
980 /* conver to nanoseconds */
981 data->elapsed_time = (time * 1000) >> 12;
982
Cornelia Huck94bb0632006-06-29 15:08:41 +0200983 cmb = cmb_data->last_block;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700984 /* copy data to new structure */
Cornelia Huck94bb0632006-06-29 15:08:41 +0200985 data->ssch_rsch_count = cmb->ssch_rsch_count;
986 data->sample_count = cmb->sample_count;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700987
988 /* time fields are converted to nanoseconds while copying */
Cornelia Huck94bb0632006-06-29 15:08:41 +0200989 data->device_connect_time = time_to_nsec(cmb->device_connect_time);
990 data->function_pending_time = time_to_nsec(cmb->function_pending_time);
991 data->device_disconnect_time =
992 time_to_nsec(cmb->device_disconnect_time);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700993 data->control_unit_queuing_time
Cornelia Huck94bb0632006-06-29 15:08:41 +0200994 = time_to_nsec(cmb->control_unit_queuing_time);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700995 data->device_active_only_time
Cornelia Huck94bb0632006-06-29 15:08:41 +0200996 = time_to_nsec(cmb->device_active_only_time);
997 data->device_busy_time = time_to_nsec(cmb->device_busy_time);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700998 data->initial_command_response_time
Cornelia Huck94bb0632006-06-29 15:08:41 +0200999 = time_to_nsec(cmb->initial_command_response_time);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001000
Cornelia Huck94bb0632006-06-29 15:08:41 +02001001 ret = 0;
1002out:
1003 spin_unlock_irqrestore(cdev->ccwlock, flags);
1004 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001005}
1006
Cornelia Huck94bb0632006-06-29 15:08:41 +02001007static void reset_cmbe(struct ccw_device *cdev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001008{
Cornelia Huck94bb0632006-06-29 15:08:41 +02001009 cmf_generic_reset(cdev);
1010}
1011
Linus Torvalds1da177e2005-04-16 15:20:36 -07001012static struct attribute_group cmf_attr_group_ext;
1013
1014static struct cmb_operations cmbops_extended = {
1015 .alloc = alloc_cmbe,
1016 .free = free_cmbe,
1017 .set = set_cmbe,
1018 .read = read_cmbe,
1019 .readall = readall_cmbe,
1020 .reset = reset_cmbe,
1021 .attr_group = &cmf_attr_group_ext,
1022};
Linus Torvalds1da177e2005-04-16 15:20:36 -07001023
Cornelia Huckfc5019c2007-10-12 16:11:15 +02001024static ssize_t cmb_show_attr(struct device *dev, char *buf, enum cmb_index idx)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001025{
1026 return sprintf(buf, "%lld\n",
1027 (unsigned long long) cmf_read(to_ccwdev(dev), idx));
1028}
1029
Cornelia Huckfc5019c2007-10-12 16:11:15 +02001030static ssize_t cmb_show_avg_sample_interval(struct device *dev,
1031 struct device_attribute *attr,
1032 char *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001033{
1034 struct ccw_device *cdev;
1035 long interval;
1036 unsigned long count;
Cornelia Huck94bb0632006-06-29 15:08:41 +02001037 struct cmb_data *cmb_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001038
1039 cdev = to_ccwdev(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001040 count = cmf_read(cdev, cmb_sample_count);
Cornelia Huck94bb0632006-06-29 15:08:41 +02001041 spin_lock_irq(cdev->ccwlock);
1042 cmb_data = cdev->private->cmb;
1043 if (count) {
1044 interval = cmb_data->last_update -
1045 cdev->private->cmb_start_time;
Cornelia Huck13ffa922006-07-17 16:09:28 +02001046 interval = (interval * 1000) >> 12;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001047 interval /= count;
Cornelia Huck94bb0632006-06-29 15:08:41 +02001048 } else
Linus Torvalds1da177e2005-04-16 15:20:36 -07001049 interval = -1;
Cornelia Huck94bb0632006-06-29 15:08:41 +02001050 spin_unlock_irq(cdev->ccwlock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001051 return sprintf(buf, "%ld\n", interval);
1052}
1053
Cornelia Huckfc5019c2007-10-12 16:11:15 +02001054static ssize_t cmb_show_avg_utilization(struct device *dev,
1055 struct device_attribute *attr,
1056 char *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001057{
1058 struct cmbdata data;
1059 u64 utilization;
1060 unsigned long t, u;
1061 int ret;
1062
1063 ret = cmf_readall(to_ccwdev(dev), &data);
Cornelia Huck94bb0632006-06-29 15:08:41 +02001064 if (ret == -EAGAIN || ret == -ENODEV)
1065 /* No data (yet/currently) available to use for calculation. */
1066 return sprintf(buf, "n/a\n");
1067 else if (ret)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001068 return ret;
1069
1070 utilization = data.device_connect_time +
1071 data.function_pending_time +
1072 data.device_disconnect_time;
1073
1074 /* shift to avoid long long division */
1075 while (-1ul < (data.elapsed_time | utilization)) {
1076 utilization >>= 8;
1077 data.elapsed_time >>= 8;
1078 }
1079
1080 /* calculate value in 0.1 percent units */
1081 t = (unsigned long) data.elapsed_time / 1000;
1082 u = (unsigned long) utilization / t;
1083
1084 return sprintf(buf, "%02ld.%01ld%%\n", u/ 10, u - (u/ 10) * 10);
1085}
1086
1087#define cmf_attr(name) \
Cornelia Huckfc5019c2007-10-12 16:11:15 +02001088static ssize_t show_##name(struct device *dev, \
1089 struct device_attribute *attr, char *buf) \
1090{ return cmb_show_attr((dev), buf, cmb_##name); } \
1091static DEVICE_ATTR(name, 0444, show_##name, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001092
1093#define cmf_attr_avg(name) \
Cornelia Huckfc5019c2007-10-12 16:11:15 +02001094static ssize_t show_avg_##name(struct device *dev, \
1095 struct device_attribute *attr, char *buf) \
1096{ return cmb_show_attr((dev), buf, cmb_##name); } \
1097static DEVICE_ATTR(avg_##name, 0444, show_avg_##name, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001098
1099cmf_attr(ssch_rsch_count);
1100cmf_attr(sample_count);
1101cmf_attr_avg(device_connect_time);
1102cmf_attr_avg(function_pending_time);
1103cmf_attr_avg(device_disconnect_time);
1104cmf_attr_avg(control_unit_queuing_time);
1105cmf_attr_avg(device_active_only_time);
1106cmf_attr_avg(device_busy_time);
1107cmf_attr_avg(initial_command_response_time);
1108
Cornelia Huckfc5019c2007-10-12 16:11:15 +02001109static DEVICE_ATTR(avg_sample_interval, 0444, cmb_show_avg_sample_interval,
1110 NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001111static DEVICE_ATTR(avg_utilization, 0444, cmb_show_avg_utilization, NULL);
1112
1113static struct attribute *cmf_attributes[] = {
1114 &dev_attr_avg_sample_interval.attr,
1115 &dev_attr_avg_utilization.attr,
1116 &dev_attr_ssch_rsch_count.attr,
1117 &dev_attr_sample_count.attr,
1118 &dev_attr_avg_device_connect_time.attr,
1119 &dev_attr_avg_function_pending_time.attr,
1120 &dev_attr_avg_device_disconnect_time.attr,
1121 &dev_attr_avg_control_unit_queuing_time.attr,
1122 &dev_attr_avg_device_active_only_time.attr,
Heiko Carstensd2c993d2006-07-12 16:41:55 +02001123 NULL,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001124};
1125
1126static struct attribute_group cmf_attr_group = {
1127 .name = "cmf",
1128 .attrs = cmf_attributes,
1129};
1130
1131static struct attribute *cmf_attributes_ext[] = {
1132 &dev_attr_avg_sample_interval.attr,
1133 &dev_attr_avg_utilization.attr,
1134 &dev_attr_ssch_rsch_count.attr,
1135 &dev_attr_sample_count.attr,
1136 &dev_attr_avg_device_connect_time.attr,
1137 &dev_attr_avg_function_pending_time.attr,
1138 &dev_attr_avg_device_disconnect_time.attr,
1139 &dev_attr_avg_control_unit_queuing_time.attr,
1140 &dev_attr_avg_device_active_only_time.attr,
1141 &dev_attr_avg_device_busy_time.attr,
1142 &dev_attr_avg_initial_command_response_time.attr,
Heiko Carstensd2c993d2006-07-12 16:41:55 +02001143 NULL,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001144};
1145
1146static struct attribute_group cmf_attr_group_ext = {
1147 .name = "cmf",
1148 .attrs = cmf_attributes_ext,
1149};
1150
Cornelia Huckfc5019c2007-10-12 16:11:15 +02001151static ssize_t cmb_enable_show(struct device *dev,
1152 struct device_attribute *attr,
1153 char *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001154{
Sebastian Ott279b8f92015-09-07 19:50:25 +02001155 struct ccw_device *cdev = to_ccwdev(dev);
1156 int enabled;
1157
1158 spin_lock_irq(cdev->ccwlock);
1159 enabled = !!cdev->private->cmb;
1160 spin_unlock_irq(cdev->ccwlock);
1161
1162 return sprintf(buf, "%d\n", enabled);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001163}
1164
Cornelia Huckfc5019c2007-10-12 16:11:15 +02001165static ssize_t cmb_enable_store(struct device *dev,
1166 struct device_attribute *attr, const char *buf,
1167 size_t c)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001168{
Sebastian Ott279b8f92015-09-07 19:50:25 +02001169 struct ccw_device *cdev = to_ccwdev(dev);
Cornelia Huck2f972202008-04-30 13:38:33 +02001170 unsigned long val;
Sebastian Ott279b8f92015-09-07 19:50:25 +02001171 int ret;
Cornelia Huck2f972202008-04-30 13:38:33 +02001172
Jingoo Han01787222013-07-22 10:18:15 +09001173 ret = kstrtoul(buf, 16, &val);
Cornelia Huck2f972202008-04-30 13:38:33 +02001174 if (ret)
1175 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001176
Cornelia Huck2f972202008-04-30 13:38:33 +02001177 switch (val) {
1178 case 0:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001179 ret = disable_cmf(cdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001180 break;
Cornelia Huck2f972202008-04-30 13:38:33 +02001181 case 1:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001182 ret = enable_cmf(cdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001183 break;
Sebastian Ott279b8f92015-09-07 19:50:25 +02001184 default:
1185 ret = -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001186 }
1187
Sebastian Ott279b8f92015-09-07 19:50:25 +02001188 return ret ? ret : c;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001189}
Sebastian Ott279b8f92015-09-07 19:50:25 +02001190DEVICE_ATTR_RW(cmb_enable);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001191
Sebastian Ott823d4942009-06-16 10:30:20 +02001192int ccw_set_cmf(struct ccw_device *cdev, int enable)
1193{
1194 return cmbops->set(cdev, enable ? 2 : 0);
1195}
1196
Cornelia Huckc0208712007-10-12 16:11:16 +02001197/**
1198 * enable_cmf() - switch on the channel measurement for a specific device
1199 * @cdev: The ccw device to be enabled
1200 *
1201 * Returns %0 for success or a negative error value.
1202 *
1203 * Context:
1204 * non-atomic
1205 */
Cornelia Huckfc5019c2007-10-12 16:11:15 +02001206int enable_cmf(struct ccw_device *cdev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001207{
1208 int ret;
1209
Sebastian Ott1bc66642015-09-15 13:11:42 +02001210 device_lock(&cdev->dev);
Sebastian Otta6ef1562015-09-07 19:51:39 +02001211 get_device(&cdev->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001212 ret = cmbops->alloc(cdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001213 if (ret)
Sebastian Ott1bc66642015-09-15 13:11:42 +02001214 goto out;
1215 cmbops->reset(cdev);
1216 ret = sysfs_create_group(&cdev->dev.kobj, cmbops->attr_group);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001217 if (ret) {
1218 cmbops->free(cdev);
Sebastian Ott1bc66642015-09-15 13:11:42 +02001219 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001220 }
Sebastian Ott1bc66642015-09-15 13:11:42 +02001221 ret = cmbops->set(cdev, 2);
1222 if (ret) {
1223 sysfs_remove_group(&cdev->dev.kobj, cmbops->attr_group);
1224 cmbops->free(cdev);
1225 }
1226out:
Sebastian Otta6ef1562015-09-07 19:51:39 +02001227 if (ret)
1228 put_device(&cdev->dev);
1229
Sebastian Ott1bc66642015-09-15 13:11:42 +02001230 device_unlock(&cdev->dev);
1231 return ret;
1232}
1233
1234/**
1235 * __disable_cmf() - switch off the channel measurement for a specific device
1236 * @cdev: The ccw device to be disabled
1237 *
1238 * Returns %0 for success or a negative error value.
1239 *
1240 * Context:
1241 * non-atomic, device_lock() held.
1242 */
1243int __disable_cmf(struct ccw_device *cdev)
1244{
1245 int ret;
1246
1247 ret = cmbops->set(cdev, 0);
1248 if (ret)
1249 return ret;
1250
1251 sysfs_remove_group(&cdev->dev.kobj, cmbops->attr_group);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001252 cmbops->free(cdev);
Sebastian Otta6ef1562015-09-07 19:51:39 +02001253 put_device(&cdev->dev);
Sebastian Ott1bc66642015-09-15 13:11:42 +02001254
Linus Torvalds1da177e2005-04-16 15:20:36 -07001255 return ret;
1256}
1257
Cornelia Huckc0208712007-10-12 16:11:16 +02001258/**
1259 * disable_cmf() - switch off the channel measurement for a specific device
1260 * @cdev: The ccw device to be disabled
1261 *
1262 * Returns %0 for success or a negative error value.
1263 *
1264 * Context:
1265 * non-atomic
1266 */
Cornelia Huckfc5019c2007-10-12 16:11:15 +02001267int disable_cmf(struct ccw_device *cdev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001268{
1269 int ret;
1270
Sebastian Ott1bc66642015-09-15 13:11:42 +02001271 device_lock(&cdev->dev);
1272 ret = __disable_cmf(cdev);
1273 device_unlock(&cdev->dev);
1274
Linus Torvalds1da177e2005-04-16 15:20:36 -07001275 return ret;
1276}
1277
Cornelia Huckc0208712007-10-12 16:11:16 +02001278/**
1279 * cmf_read() - read one value from the current channel measurement block
1280 * @cdev: the channel to be read
1281 * @index: the index of the value to be read
1282 *
1283 * Returns the value read or %0 if the value cannot be read.
1284 *
1285 * Context:
1286 * any
1287 */
Cornelia Huckfc5019c2007-10-12 16:11:15 +02001288u64 cmf_read(struct ccw_device *cdev, int index)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001289{
1290 return cmbops->read(cdev, index);
1291}
1292
Cornelia Huckc0208712007-10-12 16:11:16 +02001293/**
1294 * cmf_readall() - read the current channel measurement block
1295 * @cdev: the channel to be read
1296 * @data: a pointer to a data block that will be filled
1297 *
1298 * Returns %0 on success, a negative error value otherwise.
1299 *
1300 * Context:
1301 * any
1302 */
Cornelia Huckfc5019c2007-10-12 16:11:15 +02001303int cmf_readall(struct ccw_device *cdev, struct cmbdata *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001304{
1305 return cmbops->readall(cdev, data);
1306}
1307
Cornelia Huck94bb0632006-06-29 15:08:41 +02001308/* Reenable cmf when a disconnected device becomes available again. */
1309int cmf_reenable(struct ccw_device *cdev)
1310{
1311 cmbops->reset(cdev);
1312 return cmbops->set(cdev, 2);
1313}
1314
Sebastian Ottab97d212015-09-09 10:29:59 +02001315/**
1316 * cmf_reactivate() - reactivate measurement block updates
1317 *
1318 * Use this during resume from hibernate.
1319 */
1320void cmf_reactivate(void)
1321{
1322 spin_lock(&cmb_area.lock);
1323 if (!list_empty(&cmb_area.list))
1324 cmf_activate(cmb_area.mem, 1);
1325 spin_unlock(&cmb_area.lock);
1326}
1327
Sebastian Ott45bf4b92015-09-07 19:53:01 +02001328static int __init init_cmbe(void)
1329{
1330 cmbe_cache = kmem_cache_create("cmbe_cache", sizeof(struct cmbe),
1331 __alignof__(struct cmbe), 0, NULL);
1332
1333 return cmbe_cache ? 0 : -ENOMEM;
1334}
1335
Cornelia Huckfc5019c2007-10-12 16:11:15 +02001336static int __init init_cmf(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001337{
1338 char *format_string;
Sebastian Ott45bf4b92015-09-07 19:53:01 +02001339 char *detect_string;
1340 int ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001341
Cornelia Huckfc5019c2007-10-12 16:11:15 +02001342 /*
1343 * If the user did not give a parameter, see if we are running on a
1344 * machine supporting extended measurement blocks, otherwise fall back
1345 * to basic mode.
1346 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001347 if (format == CMF_AUTODETECT) {
Cornelia Huck75784c02008-07-14 09:58:57 +02001348 if (!css_general_characteristics.ext_mb) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001349 format = CMF_BASIC;
1350 } else {
1351 format = CMF_EXTENDED;
1352 }
1353 detect_string = "autodetected";
1354 } else {
1355 detect_string = "parameter";
1356 }
1357
1358 switch (format) {
1359 case CMF_BASIC:
1360 format_string = "basic";
1361 cmbops = &cmbops_basic;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001362 break;
1363 case CMF_EXTENDED:
Cornelia Huckfc5019c2007-10-12 16:11:15 +02001364 format_string = "extended";
Linus Torvalds1da177e2005-04-16 15:20:36 -07001365 cmbops = &cmbops_extended;
Sebastian Ott45bf4b92015-09-07 19:53:01 +02001366
1367 ret = init_cmbe();
1368 if (ret)
1369 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001370 break;
1371 default:
Sebastian Ott45bf4b92015-09-07 19:53:01 +02001372 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001373 }
Michael Ernste6d5a422008-12-25 13:39:36 +01001374 pr_info("Channel measurement facility initialized using format "
1375 "%s (mode %s)\n", format_string, detect_string);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001376 return 0;
1377}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001378module_init(init_cmf);
1379
1380
1381MODULE_AUTHOR("Arnd Bergmann <arndb@de.ibm.com>");
1382MODULE_LICENSE("GPL");
1383MODULE_DESCRIPTION("channel measurement facility base driver\n"
Heiko Carstensa53c8fa2012-07-20 11:15:04 +02001384 "Copyright IBM Corp. 2003\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001385
1386EXPORT_SYMBOL_GPL(enable_cmf);
1387EXPORT_SYMBOL_GPL(disable_cmf);
1388EXPORT_SYMBOL_GPL(cmf_read);
1389EXPORT_SYMBOL_GPL(cmf_readall);