Commit | Line | Data |
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1da177e4 | 1 | /* |
e018ba1f | 2 | * linux/drivers/s390/cio/cmf.c |
1da177e4 LT |
3 | * |
4 | * Linux on zSeries Channel Measurement Facility support | |
5 | * | |
94bb0633 | 6 | * Copyright 2000,2006 IBM Corporation |
1da177e4 | 7 | * |
94bb0633 CH |
8 | * Authors: Arnd Bergmann <arndb@de.ibm.com> |
9 | * Cornelia Huck <cornelia.huck@de.ibm.com> | |
1da177e4 LT |
10 | * |
11 | * original idea from Natarajan Krishnaswami <nkrishna@us.ibm.com> | |
12 | * | |
13 | * This program is free software; you can redistribute it and/or modify | |
14 | * it under the terms of the GNU General Public License as published by | |
15 | * the Free Software Foundation; either version 2, or (at your option) | |
16 | * any later version. | |
17 | * | |
18 | * This program is distributed in the hope that it will be useful, | |
19 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
20 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
21 | * GNU General Public License for more details. | |
22 | * | |
23 | * You should have received a copy of the GNU General Public License | |
24 | * along with this program; if not, write to the Free Software | |
25 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
26 | */ | |
27 | ||
28 | #include <linux/bootmem.h> | |
29 | #include <linux/device.h> | |
30 | #include <linux/init.h> | |
31 | #include <linux/list.h> | |
32 | #include <linux/module.h> | |
33 | #include <linux/moduleparam.h> | |
4e57b681 TS |
34 | #include <linux/slab.h> |
35 | #include <linux/timex.h> /* get_clock() */ | |
1da177e4 LT |
36 | |
37 | #include <asm/ccwdev.h> | |
38 | #include <asm/cio.h> | |
39 | #include <asm/cmb.h> | |
4e57b681 | 40 | #include <asm/div64.h> |
1da177e4 LT |
41 | |
42 | #include "cio.h" | |
43 | #include "css.h" | |
44 | #include "device.h" | |
45 | #include "ioasm.h" | |
46 | #include "chsc.h" | |
47 | ||
fc5019c5 CH |
48 | /* |
49 | * parameter to enable cmf during boot, possible uses are: | |
1da177e4 LT |
50 | * "s390cmf" -- enable cmf and allocate 2 MB of ram so measuring can be |
51 | * used on any subchannel | |
52 | * "s390cmf=<num>" -- enable cmf and allocate enough memory to measure | |
53 | * <num> subchannel, where <num> is an integer | |
54 | * between 1 and 65535, default is 1024 | |
55 | */ | |
56 | #define ARGSTRING "s390cmf" | |
57 | ||
58 | /* indices for READCMB */ | |
59 | enum cmb_index { | |
60 | /* basic and exended format: */ | |
61 | cmb_ssch_rsch_count, | |
62 | cmb_sample_count, | |
63 | cmb_device_connect_time, | |
64 | cmb_function_pending_time, | |
65 | cmb_device_disconnect_time, | |
66 | cmb_control_unit_queuing_time, | |
67 | cmb_device_active_only_time, | |
68 | /* extended format only: */ | |
69 | cmb_device_busy_time, | |
70 | cmb_initial_command_response_time, | |
71 | }; | |
72 | ||
73 | /** | |
74 | * enum cmb_format - types of supported measurement block formats | |
75 | * | |
76 | * @CMF_BASIC: traditional channel measurement blocks supported | |
c0208716 | 77 | * by all machines that we run on |
1da177e4 | 78 | * @CMF_EXTENDED: improved format that was introduced with the z990 |
c0208716 CH |
79 | * machine |
80 | * @CMF_AUTODETECT: default: use extended format when running on a machine | |
81 | * supporting extended format, otherwise fall back to | |
82 | * basic format | |
83 | */ | |
1da177e4 LT |
84 | enum cmb_format { |
85 | CMF_BASIC, | |
86 | CMF_EXTENDED, | |
87 | CMF_AUTODETECT = -1, | |
88 | }; | |
fc5019c5 | 89 | |
c0208716 | 90 | /* |
1da177e4 LT |
91 | * format - actual format for all measurement blocks |
92 | * | |
93 | * The format module parameter can be set to a value of 0 (zero) | |
94 | * or 1, indicating basic or extended format as described for | |
95 | * enum cmb_format. | |
96 | */ | |
97 | static int format = CMF_AUTODETECT; | |
98 | module_param(format, bool, 0444); | |
99 | ||
100 | /** | |
101 | * struct cmb_operations - functions to use depending on cmb_format | |
102 | * | |
94bb0633 CH |
103 | * Most of these functions operate on a struct ccw_device. There is only |
104 | * one instance of struct cmb_operations because the format of the measurement | |
105 | * data is guaranteed to be the same for every ccw_device. | |
1da177e4 LT |
106 | * |
107 | * @alloc: allocate memory for a channel measurement block, | |
108 | * either with the help of a special pool or with kmalloc | |
109 | * @free: free memory allocated with @alloc | |
110 | * @set: enable or disable measurement | |
c0208716 | 111 | * @read: read a measurement entry at an index |
1da177e4 LT |
112 | * @readall: read a measurement block in a common format |
113 | * @reset: clear the data in the associated measurement block and | |
114 | * reset its time stamp | |
94bb0633 | 115 | * @align: align an allocated block so that the hardware can use it |
1da177e4 LT |
116 | */ |
117 | struct cmb_operations { | |
fc5019c5 CH |
118 | 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 *); | |
124 | void *(*align) (void *); | |
c0208716 | 125 | /* private: */ |
1da177e4 LT |
126 | struct attribute_group *attr_group; |
127 | }; | |
128 | static struct cmb_operations *cmbops; | |
129 | ||
94bb0633 CH |
130 | struct cmb_data { |
131 | void *hw_block; /* Pointer to block updated by hardware */ | |
132 | void *last_block; /* Last changed block copied from hardware block */ | |
133 | int size; /* Size of hw_block and last_block */ | |
134 | unsigned long long last_update; /* when last_block was updated */ | |
135 | }; | |
136 | ||
fc5019c5 CH |
137 | /* |
138 | * Our user interface is designed in terms of nanoseconds, | |
1da177e4 | 139 | * while the hardware measures total times in its own |
fc5019c5 CH |
140 | * unit. |
141 | */ | |
1da177e4 LT |
142 | static inline u64 time_to_nsec(u32 value) |
143 | { | |
144 | return ((u64)value) * 128000ull; | |
145 | } | |
146 | ||
147 | /* | |
148 | * Users are usually interested in average times, | |
149 | * not accumulated time. | |
150 | * This also helps us with atomicity problems | |
151 | * when reading sinlge values. | |
152 | */ | |
153 | static inline u64 time_to_avg_nsec(u32 value, u32 count) | |
154 | { | |
155 | u64 ret; | |
156 | ||
157 | /* no samples yet, avoid division by 0 */ | |
158 | if (count == 0) | |
159 | return 0; | |
160 | ||
96de0e25 | 161 | /* value comes in units of 128 µsec */ |
1da177e4 LT |
162 | ret = time_to_nsec(value); |
163 | do_div(ret, count); | |
164 | ||
165 | return ret; | |
166 | } | |
167 | ||
fc5019c5 CH |
168 | /* |
169 | * Activate or deactivate the channel monitor. When area is NULL, | |
1da177e4 LT |
170 | * the monitor is deactivated. The channel monitor needs to |
171 | * be active in order to measure subchannels, which also need | |
fc5019c5 CH |
172 | * to be enabled. |
173 | */ | |
174 | static inline void cmf_activate(void *area, unsigned int onoff) | |
1da177e4 LT |
175 | { |
176 | register void * __gpr2 asm("2"); | |
177 | register long __gpr1 asm("1"); | |
178 | ||
179 | __gpr2 = area; | |
180 | __gpr1 = onoff ? 2 : 0; | |
181 | /* activate channel measurement */ | |
182 | asm("schm" : : "d" (__gpr2), "d" (__gpr1) ); | |
183 | } | |
184 | ||
fc5019c5 CH |
185 | static int set_schib(struct ccw_device *cdev, u32 mme, int mbfc, |
186 | unsigned long address) | |
1da177e4 LT |
187 | { |
188 | int ret; | |
189 | int retry; | |
190 | struct subchannel *sch; | |
191 | struct schib *schib; | |
192 | ||
193 | sch = to_subchannel(cdev->dev.parent); | |
194 | schib = &sch->schib; | |
195 | /* msch can silently fail, so do it again if necessary */ | |
196 | for (retry = 0; retry < 3; retry++) { | |
197 | /* prepare schib */ | |
a8237fc4 | 198 | stsch(sch->schid, schib); |
1da177e4 LT |
199 | schib->pmcw.mme = mme; |
200 | schib->pmcw.mbfc = mbfc; | |
201 | /* address can be either a block address or a block index */ | |
202 | if (mbfc) | |
203 | schib->mba = address; | |
204 | else | |
205 | schib->pmcw.mbi = address; | |
206 | ||
207 | /* try to submit it */ | |
a8237fc4 | 208 | switch(ret = msch_err(sch->schid, schib)) { |
1da177e4 LT |
209 | case 0: |
210 | break; | |
211 | case 1: | |
212 | case 2: /* in I/O or status pending */ | |
213 | ret = -EBUSY; | |
214 | break; | |
215 | case 3: /* subchannel is no longer valid */ | |
216 | ret = -ENODEV; | |
217 | break; | |
218 | default: /* msch caught an exception */ | |
219 | ret = -EINVAL; | |
220 | break; | |
221 | } | |
a8237fc4 | 222 | stsch(sch->schid, schib); /* restore the schib */ |
1da177e4 LT |
223 | |
224 | if (ret) | |
225 | break; | |
226 | ||
227 | /* check if it worked */ | |
228 | if (schib->pmcw.mme == mme && | |
229 | schib->pmcw.mbfc == mbfc && | |
230 | (mbfc ? (schib->mba == address) | |
231 | : (schib->pmcw.mbi == address))) | |
232 | return 0; | |
233 | ||
234 | ret = -EINVAL; | |
235 | } | |
236 | ||
237 | return ret; | |
238 | } | |
239 | ||
240 | struct set_schib_struct { | |
241 | u32 mme; | |
242 | int mbfc; | |
243 | unsigned long address; | |
244 | wait_queue_head_t wait; | |
245 | int ret; | |
94bb0633 | 246 | struct kref kref; |
1da177e4 LT |
247 | }; |
248 | ||
94bb0633 CH |
249 | static void cmf_set_schib_release(struct kref *kref) |
250 | { | |
251 | struct set_schib_struct *set_data; | |
252 | ||
253 | set_data = container_of(kref, struct set_schib_struct, kref); | |
254 | kfree(set_data); | |
255 | } | |
256 | ||
257 | #define CMF_PENDING 1 | |
258 | ||
1da177e4 LT |
259 | static int set_schib_wait(struct ccw_device *cdev, u32 mme, |
260 | int mbfc, unsigned long address) | |
261 | { | |
94bb0633 CH |
262 | struct set_schib_struct *set_data; |
263 | int ret; | |
1da177e4 LT |
264 | |
265 | spin_lock_irq(cdev->ccwlock); | |
94bb0633 CH |
266 | if (!cdev->private->cmb) { |
267 | ret = -ENODEV; | |
268 | goto out; | |
1da177e4 | 269 | } |
94bb0633 CH |
270 | set_data = kzalloc(sizeof(struct set_schib_struct), GFP_ATOMIC); |
271 | if (!set_data) { | |
272 | ret = -ENOMEM; | |
273 | goto out; | |
274 | } | |
275 | init_waitqueue_head(&set_data->wait); | |
276 | kref_init(&set_data->kref); | |
277 | set_data->mme = mme; | |
278 | set_data->mbfc = mbfc; | |
279 | set_data->address = address; | |
280 | ||
281 | ret = set_schib(cdev, mme, mbfc, address); | |
282 | if (ret != -EBUSY) | |
283 | goto out_put; | |
1da177e4 LT |
284 | |
285 | if (cdev->private->state != DEV_STATE_ONLINE) { | |
1da177e4 | 286 | /* if the device is not online, don't even try again */ |
94bb0633 CH |
287 | ret = -EBUSY; |
288 | goto out_put; | |
1da177e4 | 289 | } |
94bb0633 | 290 | |
1da177e4 | 291 | cdev->private->state = DEV_STATE_CMFCHANGE; |
94bb0633 CH |
292 | set_data->ret = CMF_PENDING; |
293 | cdev->private->cmb_wait = set_data; | |
1da177e4 LT |
294 | |
295 | spin_unlock_irq(cdev->ccwlock); | |
94bb0633 CH |
296 | if (wait_event_interruptible(set_data->wait, |
297 | set_data->ret != CMF_PENDING)) { | |
1da177e4 | 298 | spin_lock_irq(cdev->ccwlock); |
94bb0633 CH |
299 | if (set_data->ret == CMF_PENDING) { |
300 | set_data->ret = -ERESTARTSYS; | |
1da177e4 LT |
301 | if (cdev->private->state == DEV_STATE_CMFCHANGE) |
302 | cdev->private->state = DEV_STATE_ONLINE; | |
303 | } | |
304 | spin_unlock_irq(cdev->ccwlock); | |
305 | } | |
94bb0633 CH |
306 | spin_lock_irq(cdev->ccwlock); |
307 | cdev->private->cmb_wait = NULL; | |
308 | ret = set_data->ret; | |
309 | out_put: | |
310 | kref_put(&set_data->kref, cmf_set_schib_release); | |
311 | out: | |
1da177e4 | 312 | spin_unlock_irq(cdev->ccwlock); |
94bb0633 | 313 | return ret; |
1da177e4 LT |
314 | } |
315 | ||
316 | void retry_set_schib(struct ccw_device *cdev) | |
317 | { | |
94bb0633 CH |
318 | struct set_schib_struct *set_data; |
319 | ||
320 | set_data = cdev->private->cmb_wait; | |
321 | if (!set_data) { | |
322 | WARN_ON(1); | |
323 | return; | |
324 | } | |
325 | kref_get(&set_data->kref); | |
326 | set_data->ret = set_schib(cdev, set_data->mme, set_data->mbfc, | |
327 | set_data->address); | |
328 | wake_up(&set_data->wait); | |
329 | kref_put(&set_data->kref, cmf_set_schib_release); | |
330 | } | |
331 | ||
332 | static int cmf_copy_block(struct ccw_device *cdev) | |
333 | { | |
334 | struct subchannel *sch; | |
335 | void *reference_buf; | |
336 | void *hw_block; | |
337 | struct cmb_data *cmb_data; | |
338 | ||
339 | sch = to_subchannel(cdev->dev.parent); | |
340 | ||
341 | if (stsch(sch->schid, &sch->schib)) | |
342 | return -ENODEV; | |
343 | ||
23d805b6 | 344 | if (scsw_fctl(&sch->schib.scsw) & SCSW_FCTL_START_FUNC) { |
94bb0633 | 345 | /* Don't copy if a start function is in progress. */ |
23d805b6 PO |
346 | if ((!(scsw_actl(&sch->schib.scsw) & SCSW_ACTL_SUSPENDED)) && |
347 | (scsw_actl(&sch->schib.scsw) & | |
94bb0633 | 348 | (SCSW_ACTL_DEVACT | SCSW_ACTL_SCHACT)) && |
23d805b6 | 349 | (!(scsw_stctl(&sch->schib.scsw) & SCSW_STCTL_SEC_STATUS))) |
94bb0633 CH |
350 | return -EBUSY; |
351 | } | |
352 | cmb_data = cdev->private->cmb; | |
353 | hw_block = cmbops->align(cmb_data->hw_block); | |
354 | if (!memcmp(cmb_data->last_block, hw_block, cmb_data->size)) | |
355 | /* No need to copy. */ | |
356 | return 0; | |
357 | reference_buf = kzalloc(cmb_data->size, GFP_ATOMIC); | |
358 | if (!reference_buf) | |
359 | return -ENOMEM; | |
360 | /* Ensure consistency of block copied from hardware. */ | |
361 | do { | |
362 | memcpy(cmb_data->last_block, hw_block, cmb_data->size); | |
363 | memcpy(reference_buf, hw_block, cmb_data->size); | |
364 | } while (memcmp(cmb_data->last_block, reference_buf, cmb_data->size)); | |
365 | cmb_data->last_update = get_clock(); | |
366 | kfree(reference_buf); | |
367 | return 0; | |
368 | } | |
369 | ||
370 | struct copy_block_struct { | |
371 | wait_queue_head_t wait; | |
372 | int ret; | |
373 | struct kref kref; | |
374 | }; | |
375 | ||
376 | static void cmf_copy_block_release(struct kref *kref) | |
377 | { | |
378 | struct copy_block_struct *copy_block; | |
379 | ||
380 | copy_block = container_of(kref, struct copy_block_struct, kref); | |
381 | kfree(copy_block); | |
382 | } | |
383 | ||
384 | static int cmf_cmb_copy_wait(struct ccw_device *cdev) | |
385 | { | |
386 | struct copy_block_struct *copy_block; | |
387 | int ret; | |
388 | unsigned long flags; | |
389 | ||
390 | spin_lock_irqsave(cdev->ccwlock, flags); | |
391 | if (!cdev->private->cmb) { | |
392 | ret = -ENODEV; | |
393 | goto out; | |
394 | } | |
395 | copy_block = kzalloc(sizeof(struct copy_block_struct), GFP_ATOMIC); | |
396 | if (!copy_block) { | |
397 | ret = -ENOMEM; | |
398 | goto out; | |
399 | } | |
400 | init_waitqueue_head(©_block->wait); | |
401 | kref_init(©_block->kref); | |
402 | ||
403 | ret = cmf_copy_block(cdev); | |
404 | if (ret != -EBUSY) | |
405 | goto out_put; | |
406 | ||
407 | if (cdev->private->state != DEV_STATE_ONLINE) { | |
408 | ret = -EBUSY; | |
409 | goto out_put; | |
410 | } | |
411 | ||
412 | cdev->private->state = DEV_STATE_CMFUPDATE; | |
413 | copy_block->ret = CMF_PENDING; | |
414 | cdev->private->cmb_wait = copy_block; | |
415 | ||
416 | spin_unlock_irqrestore(cdev->ccwlock, flags); | |
417 | if (wait_event_interruptible(copy_block->wait, | |
418 | copy_block->ret != CMF_PENDING)) { | |
419 | spin_lock_irqsave(cdev->ccwlock, flags); | |
420 | if (copy_block->ret == CMF_PENDING) { | |
421 | copy_block->ret = -ERESTARTSYS; | |
422 | if (cdev->private->state == DEV_STATE_CMFUPDATE) | |
423 | cdev->private->state = DEV_STATE_ONLINE; | |
424 | } | |
425 | spin_unlock_irqrestore(cdev->ccwlock, flags); | |
426 | } | |
427 | spin_lock_irqsave(cdev->ccwlock, flags); | |
428 | cdev->private->cmb_wait = NULL; | |
429 | ret = copy_block->ret; | |
430 | out_put: | |
431 | kref_put(©_block->kref, cmf_copy_block_release); | |
432 | out: | |
433 | spin_unlock_irqrestore(cdev->ccwlock, flags); | |
434 | return ret; | |
435 | } | |
436 | ||
437 | void cmf_retry_copy_block(struct ccw_device *cdev) | |
438 | { | |
439 | struct copy_block_struct *copy_block; | |
1da177e4 | 440 | |
94bb0633 CH |
441 | copy_block = cdev->private->cmb_wait; |
442 | if (!copy_block) { | |
1da177e4 LT |
443 | WARN_ON(1); |
444 | return; | |
445 | } | |
94bb0633 CH |
446 | kref_get(©_block->kref); |
447 | copy_block->ret = cmf_copy_block(cdev); | |
448 | wake_up(©_block->wait); | |
449 | kref_put(©_block->kref, cmf_copy_block_release); | |
450 | } | |
451 | ||
452 | static void cmf_generic_reset(struct ccw_device *cdev) | |
453 | { | |
454 | struct cmb_data *cmb_data; | |
455 | ||
456 | spin_lock_irq(cdev->ccwlock); | |
457 | cmb_data = cdev->private->cmb; | |
458 | if (cmb_data) { | |
459 | memset(cmb_data->last_block, 0, cmb_data->size); | |
460 | /* | |
461 | * Need to reset hw block as well to make the hardware start | |
462 | * from 0 again. | |
463 | */ | |
464 | memset(cmbops->align(cmb_data->hw_block), 0, cmb_data->size); | |
465 | cmb_data->last_update = 0; | |
466 | } | |
467 | cdev->private->cmb_start_time = get_clock(); | |
468 | spin_unlock_irq(cdev->ccwlock); | |
1da177e4 LT |
469 | } |
470 | ||
471 | /** | |
472 | * struct cmb_area - container for global cmb data | |
473 | * | |
474 | * @mem: pointer to CMBs (only in basic measurement mode) | |
475 | * @list: contains a linked list of all subchannels | |
c0208716 | 476 | * @num_channels: number of channels to be measured |
1da177e4 LT |
477 | * @lock: protect concurrent access to @mem and @list |
478 | */ | |
479 | struct cmb_area { | |
480 | struct cmb *mem; | |
481 | struct list_head list; | |
482 | int num_channels; | |
483 | spinlock_t lock; | |
484 | }; | |
485 | ||
486 | static struct cmb_area cmb_area = { | |
cb629a01 | 487 | .lock = __SPIN_LOCK_UNLOCKED(cmb_area.lock), |
1da177e4 LT |
488 | .list = LIST_HEAD_INIT(cmb_area.list), |
489 | .num_channels = 1024, | |
490 | }; | |
491 | ||
1da177e4 LT |
492 | /* ****** old style CMB handling ********/ |
493 | ||
fc5019c5 | 494 | /* |
1da177e4 LT |
495 | * Basic channel measurement blocks are allocated in one contiguous |
496 | * block of memory, which can not be moved as long as any channel | |
497 | * is active. Therefore, a maximum number of subchannels needs to | |
498 | * be defined somewhere. This is a module parameter, defaulting to | |
499 | * a resonable value of 1024, or 32 kb of memory. | |
500 | * Current kernels don't allow kmalloc with more than 128kb, so the | |
fc5019c5 | 501 | * maximum is 4096. |
1da177e4 LT |
502 | */ |
503 | ||
504 | module_param_named(maxchannels, cmb_area.num_channels, uint, 0444); | |
505 | ||
506 | /** | |
507 | * struct cmb - basic channel measurement block | |
c0208716 CH |
508 | * @ssch_rsch_count: number of ssch and rsch |
509 | * @sample_count: number of samples | |
510 | * @device_connect_time: time of device connect | |
511 | * @function_pending_time: time of function pending | |
512 | * @device_disconnect_time: time of device disconnect | |
513 | * @control_unit_queuing_time: time of control unit queuing | |
514 | * @device_active_only_time: time of device active only | |
515 | * @reserved: unused in basic measurement mode | |
516 | * | |
517 | * The measurement block as used by the hardware. The fields are described | |
518 | * further in z/Architecture Principles of Operation, chapter 17. | |
1da177e4 | 519 | * |
c0208716 CH |
520 | * The cmb area made up from these blocks must be a contiguous array and may |
521 | * not be reallocated or freed. | |
1da177e4 LT |
522 | * Only one cmb area can be present in the system. |
523 | */ | |
524 | struct cmb { | |
525 | u16 ssch_rsch_count; | |
526 | u16 sample_count; | |
527 | u32 device_connect_time; | |
528 | u32 function_pending_time; | |
529 | u32 device_disconnect_time; | |
530 | u32 control_unit_queuing_time; | |
531 | u32 device_active_only_time; | |
532 | u32 reserved[2]; | |
533 | }; | |
534 | ||
fc5019c5 CH |
535 | /* |
536 | * Insert a single device into the cmb_area list. | |
537 | * Called with cmb_area.lock held from alloc_cmb. | |
1da177e4 | 538 | */ |
4d284cac HC |
539 | static int alloc_cmb_single(struct ccw_device *cdev, |
540 | struct cmb_data *cmb_data) | |
1da177e4 LT |
541 | { |
542 | struct cmb *cmb; | |
543 | struct ccw_device_private *node; | |
544 | int ret; | |
545 | ||
546 | spin_lock_irq(cdev->ccwlock); | |
547 | if (!list_empty(&cdev->private->cmb_list)) { | |
548 | ret = -EBUSY; | |
549 | goto out; | |
550 | } | |
551 | ||
fc5019c5 CH |
552 | /* |
553 | * Find first unused cmb in cmb_area.mem. | |
554 | * This is a little tricky: cmb_area.list | |
555 | * remains sorted by ->cmb->hw_data pointers. | |
556 | */ | |
1da177e4 LT |
557 | cmb = cmb_area.mem; |
558 | list_for_each_entry(node, &cmb_area.list, cmb_list) { | |
94bb0633 CH |
559 | struct cmb_data *data; |
560 | data = node->cmb; | |
561 | if ((struct cmb*)data->hw_block > cmb) | |
1da177e4 LT |
562 | break; |
563 | cmb++; | |
564 | } | |
565 | if (cmb - cmb_area.mem >= cmb_area.num_channels) { | |
566 | ret = -ENOMEM; | |
567 | goto out; | |
568 | } | |
569 | ||
570 | /* insert new cmb */ | |
571 | list_add_tail(&cdev->private->cmb_list, &node->cmb_list); | |
94bb0633 CH |
572 | cmb_data->hw_block = cmb; |
573 | cdev->private->cmb = cmb_data; | |
1da177e4 LT |
574 | ret = 0; |
575 | out: | |
576 | spin_unlock_irq(cdev->ccwlock); | |
577 | return ret; | |
578 | } | |
579 | ||
fc5019c5 | 580 | static int alloc_cmb(struct ccw_device *cdev) |
1da177e4 LT |
581 | { |
582 | int ret; | |
583 | struct cmb *mem; | |
584 | ssize_t size; | |
94bb0633 CH |
585 | struct cmb_data *cmb_data; |
586 | ||
587 | /* Allocate private cmb_data. */ | |
588 | cmb_data = kzalloc(sizeof(struct cmb_data), GFP_KERNEL); | |
589 | if (!cmb_data) | |
590 | return -ENOMEM; | |
1da177e4 | 591 | |
94bb0633 CH |
592 | cmb_data->last_block = kzalloc(sizeof(struct cmb), GFP_KERNEL); |
593 | if (!cmb_data->last_block) { | |
594 | kfree(cmb_data); | |
595 | return -ENOMEM; | |
596 | } | |
597 | cmb_data->size = sizeof(struct cmb); | |
1da177e4 LT |
598 | spin_lock(&cmb_area.lock); |
599 | ||
600 | if (!cmb_area.mem) { | |
601 | /* there is no user yet, so we need a new area */ | |
602 | size = sizeof(struct cmb) * cmb_area.num_channels; | |
603 | WARN_ON(!list_empty(&cmb_area.list)); | |
604 | ||
605 | spin_unlock(&cmb_area.lock); | |
606 | mem = (void*)__get_free_pages(GFP_KERNEL | GFP_DMA, | |
607 | get_order(size)); | |
608 | spin_lock(&cmb_area.lock); | |
609 | ||
610 | if (cmb_area.mem) { | |
611 | /* ok, another thread was faster */ | |
612 | free_pages((unsigned long)mem, get_order(size)); | |
613 | } else if (!mem) { | |
614 | /* no luck */ | |
615 | ret = -ENOMEM; | |
616 | goto out; | |
617 | } else { | |
618 | /* everything ok */ | |
619 | memset(mem, 0, size); | |
620 | cmb_area.mem = mem; | |
621 | cmf_activate(cmb_area.mem, 1); | |
622 | } | |
623 | } | |
624 | ||
625 | /* do the actual allocation */ | |
94bb0633 | 626 | ret = alloc_cmb_single(cdev, cmb_data); |
1da177e4 LT |
627 | out: |
628 | spin_unlock(&cmb_area.lock); | |
94bb0633 CH |
629 | if (ret) { |
630 | kfree(cmb_data->last_block); | |
631 | kfree(cmb_data); | |
632 | } | |
1da177e4 LT |
633 | return ret; |
634 | } | |
635 | ||
94bb0633 | 636 | static void free_cmb(struct ccw_device *cdev) |
1da177e4 LT |
637 | { |
638 | struct ccw_device_private *priv; | |
94bb0633 | 639 | struct cmb_data *cmb_data; |
1da177e4 LT |
640 | |
641 | spin_lock(&cmb_area.lock); | |
642 | spin_lock_irq(cdev->ccwlock); | |
643 | ||
94bb0633 CH |
644 | priv = cdev->private; |
645 | ||
1da177e4 LT |
646 | if (list_empty(&priv->cmb_list)) { |
647 | /* already freed */ | |
648 | goto out; | |
649 | } | |
650 | ||
94bb0633 | 651 | cmb_data = priv->cmb; |
1da177e4 | 652 | priv->cmb = NULL; |
94bb0633 CH |
653 | if (cmb_data) |
654 | kfree(cmb_data->last_block); | |
655 | kfree(cmb_data); | |
1da177e4 LT |
656 | list_del_init(&priv->cmb_list); |
657 | ||
658 | if (list_empty(&cmb_area.list)) { | |
659 | ssize_t size; | |
660 | size = sizeof(struct cmb) * cmb_area.num_channels; | |
661 | cmf_activate(NULL, 0); | |
662 | free_pages((unsigned long)cmb_area.mem, get_order(size)); | |
663 | cmb_area.mem = NULL; | |
664 | } | |
665 | out: | |
666 | spin_unlock_irq(cdev->ccwlock); | |
667 | spin_unlock(&cmb_area.lock); | |
668 | } | |
669 | ||
94bb0633 | 670 | static int set_cmb(struct ccw_device *cdev, u32 mme) |
1da177e4 LT |
671 | { |
672 | u16 offset; | |
94bb0633 CH |
673 | struct cmb_data *cmb_data; |
674 | unsigned long flags; | |
1da177e4 | 675 | |
94bb0633 CH |
676 | spin_lock_irqsave(cdev->ccwlock, flags); |
677 | if (!cdev->private->cmb) { | |
678 | spin_unlock_irqrestore(cdev->ccwlock, flags); | |
1da177e4 | 679 | return -EINVAL; |
94bb0633 CH |
680 | } |
681 | cmb_data = cdev->private->cmb; | |
682 | offset = mme ? (struct cmb *)cmb_data->hw_block - cmb_area.mem : 0; | |
683 | spin_unlock_irqrestore(cdev->ccwlock, flags); | |
1da177e4 LT |
684 | |
685 | return set_schib_wait(cdev, mme, 0, offset); | |
686 | } | |
687 | ||
fc5019c5 | 688 | static u64 read_cmb(struct ccw_device *cdev, int index) |
1da177e4 | 689 | { |
94bb0633 | 690 | struct cmb *cmb; |
1da177e4 | 691 | u32 val; |
94bb0633 CH |
692 | int ret; |
693 | unsigned long flags; | |
694 | ||
695 | ret = cmf_cmb_copy_wait(cdev); | |
696 | if (ret < 0) | |
697 | return 0; | |
1da177e4 LT |
698 | |
699 | spin_lock_irqsave(cdev->ccwlock, flags); | |
700 | if (!cdev->private->cmb) { | |
94bb0633 CH |
701 | ret = 0; |
702 | goto out; | |
1da177e4 | 703 | } |
94bb0633 | 704 | cmb = ((struct cmb_data *)cdev->private->cmb)->last_block; |
1da177e4 LT |
705 | |
706 | switch (index) { | |
707 | case cmb_ssch_rsch_count: | |
94bb0633 CH |
708 | ret = cmb->ssch_rsch_count; |
709 | goto out; | |
1da177e4 | 710 | case cmb_sample_count: |
94bb0633 CH |
711 | ret = cmb->sample_count; |
712 | goto out; | |
1da177e4 | 713 | case cmb_device_connect_time: |
94bb0633 | 714 | val = cmb->device_connect_time; |
1da177e4 LT |
715 | break; |
716 | case cmb_function_pending_time: | |
94bb0633 | 717 | val = cmb->function_pending_time; |
1da177e4 LT |
718 | break; |
719 | case cmb_device_disconnect_time: | |
94bb0633 | 720 | val = cmb->device_disconnect_time; |
1da177e4 LT |
721 | break; |
722 | case cmb_control_unit_queuing_time: | |
94bb0633 | 723 | val = cmb->control_unit_queuing_time; |
1da177e4 LT |
724 | break; |
725 | case cmb_device_active_only_time: | |
94bb0633 | 726 | val = cmb->device_active_only_time; |
1da177e4 LT |
727 | break; |
728 | default: | |
94bb0633 CH |
729 | ret = 0; |
730 | goto out; | |
1da177e4 | 731 | } |
94bb0633 CH |
732 | ret = time_to_avg_nsec(val, cmb->sample_count); |
733 | out: | |
734 | spin_unlock_irqrestore(cdev->ccwlock, flags); | |
735 | return ret; | |
1da177e4 LT |
736 | } |
737 | ||
fc5019c5 | 738 | static int readall_cmb(struct ccw_device *cdev, struct cmbdata *data) |
1da177e4 | 739 | { |
94bb0633 CH |
740 | struct cmb *cmb; |
741 | struct cmb_data *cmb_data; | |
1da177e4 | 742 | u64 time; |
94bb0633 CH |
743 | unsigned long flags; |
744 | int ret; | |
1da177e4 | 745 | |
94bb0633 CH |
746 | ret = cmf_cmb_copy_wait(cdev); |
747 | if (ret < 0) | |
748 | return ret; | |
1da177e4 | 749 | spin_lock_irqsave(cdev->ccwlock, flags); |
94bb0633 CH |
750 | cmb_data = cdev->private->cmb; |
751 | if (!cmb_data) { | |
752 | ret = -ENODEV; | |
753 | goto out; | |
1da177e4 | 754 | } |
94bb0633 CH |
755 | if (cmb_data->last_update == 0) { |
756 | ret = -EAGAIN; | |
757 | goto out; | |
758 | } | |
759 | cmb = cmb_data->last_block; | |
760 | time = cmb_data->last_update - cdev->private->cmb_start_time; | |
1da177e4 LT |
761 | |
762 | memset(data, 0, sizeof(struct cmbdata)); | |
763 | ||
764 | /* we only know values before device_busy_time */ | |
765 | data->size = offsetof(struct cmbdata, device_busy_time); | |
766 | ||
767 | /* convert to nanoseconds */ | |
768 | data->elapsed_time = (time * 1000) >> 12; | |
769 | ||
770 | /* copy data to new structure */ | |
94bb0633 CH |
771 | data->ssch_rsch_count = cmb->ssch_rsch_count; |
772 | data->sample_count = cmb->sample_count; | |
1da177e4 LT |
773 | |
774 | /* time fields are converted to nanoseconds while copying */ | |
94bb0633 CH |
775 | data->device_connect_time = time_to_nsec(cmb->device_connect_time); |
776 | data->function_pending_time = time_to_nsec(cmb->function_pending_time); | |
777 | data->device_disconnect_time = | |
778 | time_to_nsec(cmb->device_disconnect_time); | |
1da177e4 | 779 | data->control_unit_queuing_time |
94bb0633 | 780 | = time_to_nsec(cmb->control_unit_queuing_time); |
1da177e4 | 781 | data->device_active_only_time |
94bb0633 CH |
782 | = time_to_nsec(cmb->device_active_only_time); |
783 | ret = 0; | |
784 | out: | |
785 | spin_unlock_irqrestore(cdev->ccwlock, flags); | |
786 | return ret; | |
787 | } | |
1da177e4 | 788 | |
94bb0633 CH |
789 | static void reset_cmb(struct ccw_device *cdev) |
790 | { | |
791 | cmf_generic_reset(cdev); | |
1da177e4 LT |
792 | } |
793 | ||
94bb0633 | 794 | static void * align_cmb(void *area) |
1da177e4 | 795 | { |
94bb0633 | 796 | return area; |
1da177e4 LT |
797 | } |
798 | ||
799 | static struct attribute_group cmf_attr_group; | |
800 | ||
801 | static struct cmb_operations cmbops_basic = { | |
802 | .alloc = alloc_cmb, | |
803 | .free = free_cmb, | |
804 | .set = set_cmb, | |
805 | .read = read_cmb, | |
806 | .readall = readall_cmb, | |
807 | .reset = reset_cmb, | |
94bb0633 | 808 | .align = align_cmb, |
1da177e4 LT |
809 | .attr_group = &cmf_attr_group, |
810 | }; | |
364c8558 | 811 | |
1da177e4 LT |
812 | /* ******** extended cmb handling ********/ |
813 | ||
814 | /** | |
815 | * struct cmbe - extended channel measurement block | |
c0208716 CH |
816 | * @ssch_rsch_count: number of ssch and rsch |
817 | * @sample_count: number of samples | |
818 | * @device_connect_time: time of device connect | |
819 | * @function_pending_time: time of function pending | |
820 | * @device_disconnect_time: time of device disconnect | |
821 | * @control_unit_queuing_time: time of control unit queuing | |
822 | * @device_active_only_time: time of device active only | |
823 | * @device_busy_time: time of device busy | |
824 | * @initial_command_response_time: initial command response time | |
825 | * @reserved: unused | |
1da177e4 | 826 | * |
c0208716 CH |
827 | * The measurement block as used by the hardware. May be in any 64 bit physical |
828 | * location. | |
829 | * The fields are described further in z/Architecture Principles of Operation, | |
1da177e4 LT |
830 | * third edition, chapter 17. |
831 | */ | |
832 | struct cmbe { | |
833 | u32 ssch_rsch_count; | |
834 | u32 sample_count; | |
835 | u32 device_connect_time; | |
836 | u32 function_pending_time; | |
837 | u32 device_disconnect_time; | |
838 | u32 control_unit_queuing_time; | |
839 | u32 device_active_only_time; | |
840 | u32 device_busy_time; | |
841 | u32 initial_command_response_time; | |
842 | u32 reserved[7]; | |
843 | }; | |
844 | ||
fc5019c5 CH |
845 | /* |
846 | * kmalloc only guarantees 8 byte alignment, but we need cmbe | |
1da177e4 | 847 | * pointers to be naturally aligned. Make sure to allocate |
fc5019c5 CH |
848 | * enough space for two cmbes. |
849 | */ | |
850 | static inline struct cmbe *cmbe_align(struct cmbe *c) | |
1da177e4 LT |
851 | { |
852 | unsigned long addr; | |
853 | addr = ((unsigned long)c + sizeof (struct cmbe) - sizeof(long)) & | |
854 | ~(sizeof (struct cmbe) - sizeof(long)); | |
855 | return (struct cmbe*)addr; | |
856 | } | |
857 | ||
fc5019c5 | 858 | static int alloc_cmbe(struct ccw_device *cdev) |
1da177e4 LT |
859 | { |
860 | struct cmbe *cmbe; | |
94bb0633 CH |
861 | struct cmb_data *cmb_data; |
862 | int ret; | |
863 | ||
864 | cmbe = kzalloc (sizeof (*cmbe) * 2, GFP_KERNEL); | |
1da177e4 LT |
865 | if (!cmbe) |
866 | return -ENOMEM; | |
94bb0633 CH |
867 | cmb_data = kzalloc(sizeof(struct cmb_data), GFP_KERNEL); |
868 | if (!cmb_data) { | |
869 | ret = -ENOMEM; | |
870 | goto out_free; | |
871 | } | |
872 | cmb_data->last_block = kzalloc(sizeof(struct cmbe), GFP_KERNEL); | |
873 | if (!cmb_data->last_block) { | |
874 | ret = -ENOMEM; | |
875 | goto out_free; | |
876 | } | |
877 | cmb_data->size = sizeof(struct cmbe); | |
1da177e4 LT |
878 | spin_lock_irq(cdev->ccwlock); |
879 | if (cdev->private->cmb) { | |
1da177e4 | 880 | spin_unlock_irq(cdev->ccwlock); |
94bb0633 CH |
881 | ret = -EBUSY; |
882 | goto out_free; | |
1da177e4 | 883 | } |
94bb0633 CH |
884 | cmb_data->hw_block = cmbe; |
885 | cdev->private->cmb = cmb_data; | |
1da177e4 LT |
886 | spin_unlock_irq(cdev->ccwlock); |
887 | ||
888 | /* activate global measurement if this is the first channel */ | |
889 | spin_lock(&cmb_area.lock); | |
890 | if (list_empty(&cmb_area.list)) | |
891 | cmf_activate(NULL, 1); | |
892 | list_add_tail(&cdev->private->cmb_list, &cmb_area.list); | |
893 | spin_unlock(&cmb_area.lock); | |
894 | ||
895 | return 0; | |
94bb0633 CH |
896 | out_free: |
897 | if (cmb_data) | |
898 | kfree(cmb_data->last_block); | |
899 | kfree(cmb_data); | |
900 | kfree(cmbe); | |
901 | return ret; | |
1da177e4 LT |
902 | } |
903 | ||
fc5019c5 | 904 | static void free_cmbe(struct ccw_device *cdev) |
1da177e4 | 905 | { |
94bb0633 CH |
906 | struct cmb_data *cmb_data; |
907 | ||
1da177e4 | 908 | spin_lock_irq(cdev->ccwlock); |
94bb0633 | 909 | cmb_data = cdev->private->cmb; |
1da177e4 | 910 | cdev->private->cmb = NULL; |
94bb0633 CH |
911 | if (cmb_data) |
912 | kfree(cmb_data->last_block); | |
913 | kfree(cmb_data); | |
1da177e4 LT |
914 | spin_unlock_irq(cdev->ccwlock); |
915 | ||
916 | /* deactivate global measurement if this is the last channel */ | |
917 | spin_lock(&cmb_area.lock); | |
918 | list_del_init(&cdev->private->cmb_list); | |
919 | if (list_empty(&cmb_area.list)) | |
920 | cmf_activate(NULL, 0); | |
921 | spin_unlock(&cmb_area.lock); | |
922 | } | |
923 | ||
94bb0633 | 924 | static int set_cmbe(struct ccw_device *cdev, u32 mme) |
1da177e4 LT |
925 | { |
926 | unsigned long mba; | |
94bb0633 CH |
927 | struct cmb_data *cmb_data; |
928 | unsigned long flags; | |
1da177e4 | 929 | |
94bb0633 CH |
930 | spin_lock_irqsave(cdev->ccwlock, flags); |
931 | if (!cdev->private->cmb) { | |
932 | spin_unlock_irqrestore(cdev->ccwlock, flags); | |
1da177e4 | 933 | return -EINVAL; |
94bb0633 CH |
934 | } |
935 | cmb_data = cdev->private->cmb; | |
936 | mba = mme ? (unsigned long) cmbe_align(cmb_data->hw_block) : 0; | |
937 | spin_unlock_irqrestore(cdev->ccwlock, flags); | |
1da177e4 LT |
938 | |
939 | return set_schib_wait(cdev, mme, 1, mba); | |
940 | } | |
941 | ||
942 | ||
fc5019c5 | 943 | static u64 read_cmbe(struct ccw_device *cdev, int index) |
1da177e4 | 944 | { |
94bb0633 CH |
945 | struct cmbe *cmb; |
946 | struct cmb_data *cmb_data; | |
1da177e4 | 947 | u32 val; |
94bb0633 CH |
948 | int ret; |
949 | unsigned long flags; | |
1da177e4 | 950 | |
94bb0633 CH |
951 | ret = cmf_cmb_copy_wait(cdev); |
952 | if (ret < 0) | |
1da177e4 | 953 | return 0; |
1da177e4 | 954 | |
94bb0633 CH |
955 | spin_lock_irqsave(cdev->ccwlock, flags); |
956 | cmb_data = cdev->private->cmb; | |
957 | if (!cmb_data) { | |
958 | ret = 0; | |
959 | goto out; | |
960 | } | |
961 | cmb = cmb_data->last_block; | |
1da177e4 LT |
962 | |
963 | switch (index) { | |
964 | case cmb_ssch_rsch_count: | |
94bb0633 CH |
965 | ret = cmb->ssch_rsch_count; |
966 | goto out; | |
1da177e4 | 967 | case cmb_sample_count: |
94bb0633 CH |
968 | ret = cmb->sample_count; |
969 | goto out; | |
1da177e4 | 970 | case cmb_device_connect_time: |
94bb0633 | 971 | val = cmb->device_connect_time; |
1da177e4 LT |
972 | break; |
973 | case cmb_function_pending_time: | |
94bb0633 | 974 | val = cmb->function_pending_time; |
1da177e4 LT |
975 | break; |
976 | case cmb_device_disconnect_time: | |
94bb0633 | 977 | val = cmb->device_disconnect_time; |
1da177e4 LT |
978 | break; |
979 | case cmb_control_unit_queuing_time: | |
94bb0633 | 980 | val = cmb->control_unit_queuing_time; |
1da177e4 LT |
981 | break; |
982 | case cmb_device_active_only_time: | |
94bb0633 | 983 | val = cmb->device_active_only_time; |
1da177e4 LT |
984 | break; |
985 | case cmb_device_busy_time: | |
94bb0633 | 986 | val = cmb->device_busy_time; |
1da177e4 LT |
987 | break; |
988 | case cmb_initial_command_response_time: | |
94bb0633 | 989 | val = cmb->initial_command_response_time; |
1da177e4 LT |
990 | break; |
991 | default: | |
94bb0633 CH |
992 | ret = 0; |
993 | goto out; | |
1da177e4 | 994 | } |
94bb0633 CH |
995 | ret = time_to_avg_nsec(val, cmb->sample_count); |
996 | out: | |
997 | spin_unlock_irqrestore(cdev->ccwlock, flags); | |
998 | return ret; | |
1da177e4 LT |
999 | } |
1000 | ||
fc5019c5 | 1001 | static int readall_cmbe(struct ccw_device *cdev, struct cmbdata *data) |
1da177e4 | 1002 | { |
94bb0633 CH |
1003 | struct cmbe *cmb; |
1004 | struct cmb_data *cmb_data; | |
1da177e4 | 1005 | u64 time; |
94bb0633 CH |
1006 | unsigned long flags; |
1007 | int ret; | |
1da177e4 | 1008 | |
94bb0633 CH |
1009 | ret = cmf_cmb_copy_wait(cdev); |
1010 | if (ret < 0) | |
1011 | return ret; | |
1da177e4 | 1012 | spin_lock_irqsave(cdev->ccwlock, flags); |
94bb0633 CH |
1013 | cmb_data = cdev->private->cmb; |
1014 | if (!cmb_data) { | |
1015 | ret = -ENODEV; | |
1016 | goto out; | |
1da177e4 | 1017 | } |
94bb0633 CH |
1018 | if (cmb_data->last_update == 0) { |
1019 | ret = -EAGAIN; | |
1020 | goto out; | |
1021 | } | |
1022 | time = cmb_data->last_update - cdev->private->cmb_start_time; | |
1da177e4 LT |
1023 | |
1024 | memset (data, 0, sizeof(struct cmbdata)); | |
1025 | ||
1026 | /* we only know values before device_busy_time */ | |
1027 | data->size = offsetof(struct cmbdata, device_busy_time); | |
1028 | ||
1029 | /* conver to nanoseconds */ | |
1030 | data->elapsed_time = (time * 1000) >> 12; | |
1031 | ||
94bb0633 | 1032 | cmb = cmb_data->last_block; |
1da177e4 | 1033 | /* copy data to new structure */ |
94bb0633 CH |
1034 | data->ssch_rsch_count = cmb->ssch_rsch_count; |
1035 | data->sample_count = cmb->sample_count; | |
1da177e4 LT |
1036 | |
1037 | /* time fields are converted to nanoseconds while copying */ | |
94bb0633 CH |
1038 | data->device_connect_time = time_to_nsec(cmb->device_connect_time); |
1039 | data->function_pending_time = time_to_nsec(cmb->function_pending_time); | |
1040 | data->device_disconnect_time = | |
1041 | time_to_nsec(cmb->device_disconnect_time); | |
1da177e4 | 1042 | data->control_unit_queuing_time |
94bb0633 | 1043 | = time_to_nsec(cmb->control_unit_queuing_time); |
1da177e4 | 1044 | data->device_active_only_time |
94bb0633 CH |
1045 | = time_to_nsec(cmb->device_active_only_time); |
1046 | data->device_busy_time = time_to_nsec(cmb->device_busy_time); | |
1da177e4 | 1047 | data->initial_command_response_time |
94bb0633 | 1048 | = time_to_nsec(cmb->initial_command_response_time); |
1da177e4 | 1049 | |
94bb0633 CH |
1050 | ret = 0; |
1051 | out: | |
1052 | spin_unlock_irqrestore(cdev->ccwlock, flags); | |
1053 | return ret; | |
1da177e4 LT |
1054 | } |
1055 | ||
94bb0633 | 1056 | static void reset_cmbe(struct ccw_device *cdev) |
1da177e4 | 1057 | { |
94bb0633 CH |
1058 | cmf_generic_reset(cdev); |
1059 | } | |
1060 | ||
1061 | static void * align_cmbe(void *area) | |
1062 | { | |
1063 | return cmbe_align(area); | |
1da177e4 LT |
1064 | } |
1065 | ||
1066 | static struct attribute_group cmf_attr_group_ext; | |
1067 | ||
1068 | static struct cmb_operations cmbops_extended = { | |
1069 | .alloc = alloc_cmbe, | |
1070 | .free = free_cmbe, | |
1071 | .set = set_cmbe, | |
1072 | .read = read_cmbe, | |
1073 | .readall = readall_cmbe, | |
1074 | .reset = reset_cmbe, | |
94bb0633 | 1075 | .align = align_cmbe, |
1da177e4 LT |
1076 | .attr_group = &cmf_attr_group_ext, |
1077 | }; | |
1da177e4 | 1078 | |
fc5019c5 | 1079 | static ssize_t cmb_show_attr(struct device *dev, char *buf, enum cmb_index idx) |
1da177e4 LT |
1080 | { |
1081 | return sprintf(buf, "%lld\n", | |
1082 | (unsigned long long) cmf_read(to_ccwdev(dev), idx)); | |
1083 | } | |
1084 | ||
fc5019c5 CH |
1085 | static ssize_t cmb_show_avg_sample_interval(struct device *dev, |
1086 | struct device_attribute *attr, | |
1087 | char *buf) | |
1da177e4 LT |
1088 | { |
1089 | struct ccw_device *cdev; | |
1090 | long interval; | |
1091 | unsigned long count; | |
94bb0633 | 1092 | struct cmb_data *cmb_data; |
1da177e4 LT |
1093 | |
1094 | cdev = to_ccwdev(dev); | |
1da177e4 | 1095 | count = cmf_read(cdev, cmb_sample_count); |
94bb0633 CH |
1096 | spin_lock_irq(cdev->ccwlock); |
1097 | cmb_data = cdev->private->cmb; | |
1098 | if (count) { | |
1099 | interval = cmb_data->last_update - | |
1100 | cdev->private->cmb_start_time; | |
13ffa927 | 1101 | interval = (interval * 1000) >> 12; |
1da177e4 | 1102 | interval /= count; |
94bb0633 | 1103 | } else |
1da177e4 | 1104 | interval = -1; |
94bb0633 | 1105 | spin_unlock_irq(cdev->ccwlock); |
1da177e4 LT |
1106 | return sprintf(buf, "%ld\n", interval); |
1107 | } | |
1108 | ||
fc5019c5 CH |
1109 | static ssize_t cmb_show_avg_utilization(struct device *dev, |
1110 | struct device_attribute *attr, | |
1111 | char *buf) | |
1da177e4 LT |
1112 | { |
1113 | struct cmbdata data; | |
1114 | u64 utilization; | |
1115 | unsigned long t, u; | |
1116 | int ret; | |
1117 | ||
1118 | ret = cmf_readall(to_ccwdev(dev), &data); | |
94bb0633 CH |
1119 | if (ret == -EAGAIN || ret == -ENODEV) |
1120 | /* No data (yet/currently) available to use for calculation. */ | |
1121 | return sprintf(buf, "n/a\n"); | |
1122 | else if (ret) | |
1da177e4 LT |
1123 | return ret; |
1124 | ||
1125 | utilization = data.device_connect_time + | |
1126 | data.function_pending_time + | |
1127 | data.device_disconnect_time; | |
1128 | ||
1129 | /* shift to avoid long long division */ | |
1130 | while (-1ul < (data.elapsed_time | utilization)) { | |
1131 | utilization >>= 8; | |
1132 | data.elapsed_time >>= 8; | |
1133 | } | |
1134 | ||
1135 | /* calculate value in 0.1 percent units */ | |
1136 | t = (unsigned long) data.elapsed_time / 1000; | |
1137 | u = (unsigned long) utilization / t; | |
1138 | ||
1139 | return sprintf(buf, "%02ld.%01ld%%\n", u/ 10, u - (u/ 10) * 10); | |
1140 | } | |
1141 | ||
1142 | #define cmf_attr(name) \ | |
fc5019c5 CH |
1143 | static ssize_t show_##name(struct device *dev, \ |
1144 | struct device_attribute *attr, char *buf) \ | |
1145 | { return cmb_show_attr((dev), buf, cmb_##name); } \ | |
1146 | static DEVICE_ATTR(name, 0444, show_##name, NULL); | |
1da177e4 LT |
1147 | |
1148 | #define cmf_attr_avg(name) \ | |
fc5019c5 CH |
1149 | static ssize_t show_avg_##name(struct device *dev, \ |
1150 | struct device_attribute *attr, char *buf) \ | |
1151 | { return cmb_show_attr((dev), buf, cmb_##name); } \ | |
1152 | static DEVICE_ATTR(avg_##name, 0444, show_avg_##name, NULL); | |
1da177e4 LT |
1153 | |
1154 | cmf_attr(ssch_rsch_count); | |
1155 | cmf_attr(sample_count); | |
1156 | cmf_attr_avg(device_connect_time); | |
1157 | cmf_attr_avg(function_pending_time); | |
1158 | cmf_attr_avg(device_disconnect_time); | |
1159 | cmf_attr_avg(control_unit_queuing_time); | |
1160 | cmf_attr_avg(device_active_only_time); | |
1161 | cmf_attr_avg(device_busy_time); | |
1162 | cmf_attr_avg(initial_command_response_time); | |
1163 | ||
fc5019c5 CH |
1164 | static DEVICE_ATTR(avg_sample_interval, 0444, cmb_show_avg_sample_interval, |
1165 | NULL); | |
1da177e4 LT |
1166 | static DEVICE_ATTR(avg_utilization, 0444, cmb_show_avg_utilization, NULL); |
1167 | ||
1168 | static struct attribute *cmf_attributes[] = { | |
1169 | &dev_attr_avg_sample_interval.attr, | |
1170 | &dev_attr_avg_utilization.attr, | |
1171 | &dev_attr_ssch_rsch_count.attr, | |
1172 | &dev_attr_sample_count.attr, | |
1173 | &dev_attr_avg_device_connect_time.attr, | |
1174 | &dev_attr_avg_function_pending_time.attr, | |
1175 | &dev_attr_avg_device_disconnect_time.attr, | |
1176 | &dev_attr_avg_control_unit_queuing_time.attr, | |
1177 | &dev_attr_avg_device_active_only_time.attr, | |
d2c993d8 | 1178 | NULL, |
1da177e4 LT |
1179 | }; |
1180 | ||
1181 | static struct attribute_group cmf_attr_group = { | |
1182 | .name = "cmf", | |
1183 | .attrs = cmf_attributes, | |
1184 | }; | |
1185 | ||
1186 | static struct attribute *cmf_attributes_ext[] = { | |
1187 | &dev_attr_avg_sample_interval.attr, | |
1188 | &dev_attr_avg_utilization.attr, | |
1189 | &dev_attr_ssch_rsch_count.attr, | |
1190 | &dev_attr_sample_count.attr, | |
1191 | &dev_attr_avg_device_connect_time.attr, | |
1192 | &dev_attr_avg_function_pending_time.attr, | |
1193 | &dev_attr_avg_device_disconnect_time.attr, | |
1194 | &dev_attr_avg_control_unit_queuing_time.attr, | |
1195 | &dev_attr_avg_device_active_only_time.attr, | |
1196 | &dev_attr_avg_device_busy_time.attr, | |
1197 | &dev_attr_avg_initial_command_response_time.attr, | |
d2c993d8 | 1198 | NULL, |
1da177e4 LT |
1199 | }; |
1200 | ||
1201 | static struct attribute_group cmf_attr_group_ext = { | |
1202 | .name = "cmf", | |
1203 | .attrs = cmf_attributes_ext, | |
1204 | }; | |
1205 | ||
fc5019c5 CH |
1206 | static ssize_t cmb_enable_show(struct device *dev, |
1207 | struct device_attribute *attr, | |
1208 | char *buf) | |
1da177e4 LT |
1209 | { |
1210 | return sprintf(buf, "%d\n", to_ccwdev(dev)->private->cmb ? 1 : 0); | |
1211 | } | |
1212 | ||
fc5019c5 CH |
1213 | static ssize_t cmb_enable_store(struct device *dev, |
1214 | struct device_attribute *attr, const char *buf, | |
1215 | size_t c) | |
1da177e4 LT |
1216 | { |
1217 | struct ccw_device *cdev; | |
1218 | int ret; | |
2f972202 CH |
1219 | unsigned long val; |
1220 | ||
1221 | ret = strict_strtoul(buf, 16, &val); | |
1222 | if (ret) | |
1223 | return ret; | |
1da177e4 LT |
1224 | |
1225 | cdev = to_ccwdev(dev); | |
1226 | ||
2f972202 CH |
1227 | switch (val) { |
1228 | case 0: | |
1da177e4 | 1229 | ret = disable_cmf(cdev); |
1da177e4 | 1230 | break; |
2f972202 | 1231 | case 1: |
1da177e4 | 1232 | ret = enable_cmf(cdev); |
1da177e4 LT |
1233 | break; |
1234 | } | |
1235 | ||
1236 | return c; | |
1237 | } | |
1238 | ||
1239 | DEVICE_ATTR(cmb_enable, 0644, cmb_enable_show, cmb_enable_store); | |
1240 | ||
c0208716 CH |
1241 | /** |
1242 | * enable_cmf() - switch on the channel measurement for a specific device | |
1243 | * @cdev: The ccw device to be enabled | |
1244 | * | |
1245 | * Returns %0 for success or a negative error value. | |
1246 | * | |
1247 | * Context: | |
1248 | * non-atomic | |
1249 | */ | |
fc5019c5 | 1250 | int enable_cmf(struct ccw_device *cdev) |
1da177e4 LT |
1251 | { |
1252 | int ret; | |
1253 | ||
1254 | ret = cmbops->alloc(cdev); | |
1255 | cmbops->reset(cdev); | |
1256 | if (ret) | |
1257 | return ret; | |
1258 | ret = cmbops->set(cdev, 2); | |
1259 | if (ret) { | |
1260 | cmbops->free(cdev); | |
1261 | return ret; | |
1262 | } | |
1263 | ret = sysfs_create_group(&cdev->dev.kobj, cmbops->attr_group); | |
1264 | if (!ret) | |
1265 | return 0; | |
1266 | cmbops->set(cdev, 0); //FIXME: this can fail | |
1267 | cmbops->free(cdev); | |
1268 | return ret; | |
1269 | } | |
1270 | ||
c0208716 CH |
1271 | /** |
1272 | * disable_cmf() - switch off the channel measurement for a specific device | |
1273 | * @cdev: The ccw device to be disabled | |
1274 | * | |
1275 | * Returns %0 for success or a negative error value. | |
1276 | * | |
1277 | * Context: | |
1278 | * non-atomic | |
1279 | */ | |
fc5019c5 | 1280 | int disable_cmf(struct ccw_device *cdev) |
1da177e4 LT |
1281 | { |
1282 | int ret; | |
1283 | ||
1284 | ret = cmbops->set(cdev, 0); | |
1285 | if (ret) | |
1286 | return ret; | |
1287 | cmbops->free(cdev); | |
1288 | sysfs_remove_group(&cdev->dev.kobj, cmbops->attr_group); | |
1289 | return ret; | |
1290 | } | |
1291 | ||
c0208716 CH |
1292 | /** |
1293 | * cmf_read() - read one value from the current channel measurement block | |
1294 | * @cdev: the channel to be read | |
1295 | * @index: the index of the value to be read | |
1296 | * | |
1297 | * Returns the value read or %0 if the value cannot be read. | |
1298 | * | |
1299 | * Context: | |
1300 | * any | |
1301 | */ | |
fc5019c5 | 1302 | u64 cmf_read(struct ccw_device *cdev, int index) |
1da177e4 LT |
1303 | { |
1304 | return cmbops->read(cdev, index); | |
1305 | } | |
1306 | ||
c0208716 CH |
1307 | /** |
1308 | * cmf_readall() - read the current channel measurement block | |
1309 | * @cdev: the channel to be read | |
1310 | * @data: a pointer to a data block that will be filled | |
1311 | * | |
1312 | * Returns %0 on success, a negative error value otherwise. | |
1313 | * | |
1314 | * Context: | |
1315 | * any | |
1316 | */ | |
fc5019c5 | 1317 | int cmf_readall(struct ccw_device *cdev, struct cmbdata *data) |
1da177e4 LT |
1318 | { |
1319 | return cmbops->readall(cdev, data); | |
1320 | } | |
1321 | ||
94bb0633 CH |
1322 | /* Reenable cmf when a disconnected device becomes available again. */ |
1323 | int cmf_reenable(struct ccw_device *cdev) | |
1324 | { | |
1325 | cmbops->reset(cdev); | |
1326 | return cmbops->set(cdev, 2); | |
1327 | } | |
1328 | ||
fc5019c5 | 1329 | static int __init init_cmf(void) |
1da177e4 LT |
1330 | { |
1331 | char *format_string; | |
1332 | char *detect_string = "parameter"; | |
1333 | ||
fc5019c5 CH |
1334 | /* |
1335 | * If the user did not give a parameter, see if we are running on a | |
1336 | * machine supporting extended measurement blocks, otherwise fall back | |
1337 | * to basic mode. | |
1338 | */ | |
1da177e4 | 1339 | if (format == CMF_AUTODETECT) { |
75784c00 | 1340 | if (!css_general_characteristics.ext_mb) { |
1da177e4 LT |
1341 | format = CMF_BASIC; |
1342 | } else { | |
1343 | format = CMF_EXTENDED; | |
1344 | } | |
1345 | detect_string = "autodetected"; | |
1346 | } else { | |
1347 | detect_string = "parameter"; | |
1348 | } | |
1349 | ||
1350 | switch (format) { | |
1351 | case CMF_BASIC: | |
1352 | format_string = "basic"; | |
1353 | cmbops = &cmbops_basic; | |
1da177e4 LT |
1354 | break; |
1355 | case CMF_EXTENDED: | |
fc5019c5 | 1356 | format_string = "extended"; |
1da177e4 LT |
1357 | cmbops = &cmbops_extended; |
1358 | break; | |
1359 | default: | |
1da177e4 LT |
1360 | return 1; |
1361 | } | |
1362 | ||
e556bbbd CH |
1363 | printk(KERN_INFO "cio: Channel measurement facility using %s " |
1364 | "format (%s)\n", format_string, detect_string); | |
1da177e4 LT |
1365 | return 0; |
1366 | } | |
1367 | ||
1368 | module_init(init_cmf); | |
1369 | ||
1370 | ||
1371 | MODULE_AUTHOR("Arnd Bergmann <arndb@de.ibm.com>"); | |
1372 | MODULE_LICENSE("GPL"); | |
1373 | MODULE_DESCRIPTION("channel measurement facility base driver\n" | |
1374 | "Copyright 2003 IBM Corporation\n"); | |
1375 | ||
1376 | EXPORT_SYMBOL_GPL(enable_cmf); | |
1377 | EXPORT_SYMBOL_GPL(disable_cmf); | |
1378 | EXPORT_SYMBOL_GPL(cmf_read); | |
1379 | EXPORT_SYMBOL_GPL(cmf_readall); |