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 | ||
344 | if (sch->schib.scsw.fctl & SCSW_FCTL_START_FUNC) { | |
345 | /* Don't copy if a start function is in progress. */ | |
346 | if ((!sch->schib.scsw.actl & SCSW_ACTL_SUSPENDED) && | |
347 | (sch->schib.scsw.actl & | |
348 | (SCSW_ACTL_DEVACT | SCSW_ACTL_SCHACT)) && | |
349 | (!sch->schib.scsw.stctl & SCSW_STCTL_SEC_STATUS)) | |
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 */ | |
23eb68c5 CH |
615 | printk(KERN_WARNING "cio: failed to allocate area " |
616 | "for measuring %d subchannels\n", | |
617 | cmb_area.num_channels); | |
1da177e4 LT |
618 | ret = -ENOMEM; |
619 | goto out; | |
620 | } else { | |
621 | /* everything ok */ | |
622 | memset(mem, 0, size); | |
623 | cmb_area.mem = mem; | |
624 | cmf_activate(cmb_area.mem, 1); | |
625 | } | |
626 | } | |
627 | ||
628 | /* do the actual allocation */ | |
94bb0633 | 629 | ret = alloc_cmb_single(cdev, cmb_data); |
1da177e4 LT |
630 | out: |
631 | spin_unlock(&cmb_area.lock); | |
94bb0633 CH |
632 | if (ret) { |
633 | kfree(cmb_data->last_block); | |
634 | kfree(cmb_data); | |
635 | } | |
1da177e4 LT |
636 | return ret; |
637 | } | |
638 | ||
94bb0633 | 639 | static void free_cmb(struct ccw_device *cdev) |
1da177e4 LT |
640 | { |
641 | struct ccw_device_private *priv; | |
94bb0633 | 642 | struct cmb_data *cmb_data; |
1da177e4 LT |
643 | |
644 | spin_lock(&cmb_area.lock); | |
645 | spin_lock_irq(cdev->ccwlock); | |
646 | ||
94bb0633 CH |
647 | priv = cdev->private; |
648 | ||
1da177e4 LT |
649 | if (list_empty(&priv->cmb_list)) { |
650 | /* already freed */ | |
651 | goto out; | |
652 | } | |
653 | ||
94bb0633 | 654 | cmb_data = priv->cmb; |
1da177e4 | 655 | priv->cmb = NULL; |
94bb0633 CH |
656 | if (cmb_data) |
657 | kfree(cmb_data->last_block); | |
658 | kfree(cmb_data); | |
1da177e4 LT |
659 | list_del_init(&priv->cmb_list); |
660 | ||
661 | if (list_empty(&cmb_area.list)) { | |
662 | ssize_t size; | |
663 | size = sizeof(struct cmb) * cmb_area.num_channels; | |
664 | cmf_activate(NULL, 0); | |
665 | free_pages((unsigned long)cmb_area.mem, get_order(size)); | |
666 | cmb_area.mem = NULL; | |
667 | } | |
668 | out: | |
669 | spin_unlock_irq(cdev->ccwlock); | |
670 | spin_unlock(&cmb_area.lock); | |
671 | } | |
672 | ||
94bb0633 | 673 | static int set_cmb(struct ccw_device *cdev, u32 mme) |
1da177e4 LT |
674 | { |
675 | u16 offset; | |
94bb0633 CH |
676 | struct cmb_data *cmb_data; |
677 | unsigned long flags; | |
1da177e4 | 678 | |
94bb0633 CH |
679 | spin_lock_irqsave(cdev->ccwlock, flags); |
680 | if (!cdev->private->cmb) { | |
681 | spin_unlock_irqrestore(cdev->ccwlock, flags); | |
1da177e4 | 682 | return -EINVAL; |
94bb0633 CH |
683 | } |
684 | cmb_data = cdev->private->cmb; | |
685 | offset = mme ? (struct cmb *)cmb_data->hw_block - cmb_area.mem : 0; | |
686 | spin_unlock_irqrestore(cdev->ccwlock, flags); | |
1da177e4 LT |
687 | |
688 | return set_schib_wait(cdev, mme, 0, offset); | |
689 | } | |
690 | ||
fc5019c5 | 691 | static u64 read_cmb(struct ccw_device *cdev, int index) |
1da177e4 | 692 | { |
94bb0633 | 693 | struct cmb *cmb; |
1da177e4 | 694 | u32 val; |
94bb0633 CH |
695 | int ret; |
696 | unsigned long flags; | |
697 | ||
698 | ret = cmf_cmb_copy_wait(cdev); | |
699 | if (ret < 0) | |
700 | return 0; | |
1da177e4 LT |
701 | |
702 | spin_lock_irqsave(cdev->ccwlock, flags); | |
703 | if (!cdev->private->cmb) { | |
94bb0633 CH |
704 | ret = 0; |
705 | goto out; | |
1da177e4 | 706 | } |
94bb0633 | 707 | cmb = ((struct cmb_data *)cdev->private->cmb)->last_block; |
1da177e4 LT |
708 | |
709 | switch (index) { | |
710 | case cmb_ssch_rsch_count: | |
94bb0633 CH |
711 | ret = cmb->ssch_rsch_count; |
712 | goto out; | |
1da177e4 | 713 | case cmb_sample_count: |
94bb0633 CH |
714 | ret = cmb->sample_count; |
715 | goto out; | |
1da177e4 | 716 | case cmb_device_connect_time: |
94bb0633 | 717 | val = cmb->device_connect_time; |
1da177e4 LT |
718 | break; |
719 | case cmb_function_pending_time: | |
94bb0633 | 720 | val = cmb->function_pending_time; |
1da177e4 LT |
721 | break; |
722 | case cmb_device_disconnect_time: | |
94bb0633 | 723 | val = cmb->device_disconnect_time; |
1da177e4 LT |
724 | break; |
725 | case cmb_control_unit_queuing_time: | |
94bb0633 | 726 | val = cmb->control_unit_queuing_time; |
1da177e4 LT |
727 | break; |
728 | case cmb_device_active_only_time: | |
94bb0633 | 729 | val = cmb->device_active_only_time; |
1da177e4 LT |
730 | break; |
731 | default: | |
94bb0633 CH |
732 | ret = 0; |
733 | goto out; | |
1da177e4 | 734 | } |
94bb0633 CH |
735 | ret = time_to_avg_nsec(val, cmb->sample_count); |
736 | out: | |
737 | spin_unlock_irqrestore(cdev->ccwlock, flags); | |
738 | return ret; | |
1da177e4 LT |
739 | } |
740 | ||
fc5019c5 | 741 | static int readall_cmb(struct ccw_device *cdev, struct cmbdata *data) |
1da177e4 | 742 | { |
94bb0633 CH |
743 | struct cmb *cmb; |
744 | struct cmb_data *cmb_data; | |
1da177e4 | 745 | u64 time; |
94bb0633 CH |
746 | unsigned long flags; |
747 | int ret; | |
1da177e4 | 748 | |
94bb0633 CH |
749 | ret = cmf_cmb_copy_wait(cdev); |
750 | if (ret < 0) | |
751 | return ret; | |
1da177e4 | 752 | spin_lock_irqsave(cdev->ccwlock, flags); |
94bb0633 CH |
753 | cmb_data = cdev->private->cmb; |
754 | if (!cmb_data) { | |
755 | ret = -ENODEV; | |
756 | goto out; | |
1da177e4 | 757 | } |
94bb0633 CH |
758 | if (cmb_data->last_update == 0) { |
759 | ret = -EAGAIN; | |
760 | goto out; | |
761 | } | |
762 | cmb = cmb_data->last_block; | |
763 | time = cmb_data->last_update - cdev->private->cmb_start_time; | |
1da177e4 LT |
764 | |
765 | memset(data, 0, sizeof(struct cmbdata)); | |
766 | ||
767 | /* we only know values before device_busy_time */ | |
768 | data->size = offsetof(struct cmbdata, device_busy_time); | |
769 | ||
770 | /* convert to nanoseconds */ | |
771 | data->elapsed_time = (time * 1000) >> 12; | |
772 | ||
773 | /* copy data to new structure */ | |
94bb0633 CH |
774 | data->ssch_rsch_count = cmb->ssch_rsch_count; |
775 | data->sample_count = cmb->sample_count; | |
1da177e4 LT |
776 | |
777 | /* time fields are converted to nanoseconds while copying */ | |
94bb0633 CH |
778 | data->device_connect_time = time_to_nsec(cmb->device_connect_time); |
779 | data->function_pending_time = time_to_nsec(cmb->function_pending_time); | |
780 | data->device_disconnect_time = | |
781 | time_to_nsec(cmb->device_disconnect_time); | |
1da177e4 | 782 | data->control_unit_queuing_time |
94bb0633 | 783 | = time_to_nsec(cmb->control_unit_queuing_time); |
1da177e4 | 784 | data->device_active_only_time |
94bb0633 CH |
785 | = time_to_nsec(cmb->device_active_only_time); |
786 | ret = 0; | |
787 | out: | |
788 | spin_unlock_irqrestore(cdev->ccwlock, flags); | |
789 | return ret; | |
790 | } | |
1da177e4 | 791 | |
94bb0633 CH |
792 | static void reset_cmb(struct ccw_device *cdev) |
793 | { | |
794 | cmf_generic_reset(cdev); | |
1da177e4 LT |
795 | } |
796 | ||
94bb0633 | 797 | static void * align_cmb(void *area) |
1da177e4 | 798 | { |
94bb0633 | 799 | return area; |
1da177e4 LT |
800 | } |
801 | ||
802 | static struct attribute_group cmf_attr_group; | |
803 | ||
804 | static struct cmb_operations cmbops_basic = { | |
805 | .alloc = alloc_cmb, | |
806 | .free = free_cmb, | |
807 | .set = set_cmb, | |
808 | .read = read_cmb, | |
809 | .readall = readall_cmb, | |
810 | .reset = reset_cmb, | |
94bb0633 | 811 | .align = align_cmb, |
1da177e4 LT |
812 | .attr_group = &cmf_attr_group, |
813 | }; | |
364c8558 | 814 | |
1da177e4 LT |
815 | /* ******** extended cmb handling ********/ |
816 | ||
817 | /** | |
818 | * struct cmbe - extended channel measurement block | |
c0208716 CH |
819 | * @ssch_rsch_count: number of ssch and rsch |
820 | * @sample_count: number of samples | |
821 | * @device_connect_time: time of device connect | |
822 | * @function_pending_time: time of function pending | |
823 | * @device_disconnect_time: time of device disconnect | |
824 | * @control_unit_queuing_time: time of control unit queuing | |
825 | * @device_active_only_time: time of device active only | |
826 | * @device_busy_time: time of device busy | |
827 | * @initial_command_response_time: initial command response time | |
828 | * @reserved: unused | |
1da177e4 | 829 | * |
c0208716 CH |
830 | * The measurement block as used by the hardware. May be in any 64 bit physical |
831 | * location. | |
832 | * The fields are described further in z/Architecture Principles of Operation, | |
1da177e4 LT |
833 | * third edition, chapter 17. |
834 | */ | |
835 | struct cmbe { | |
836 | u32 ssch_rsch_count; | |
837 | u32 sample_count; | |
838 | u32 device_connect_time; | |
839 | u32 function_pending_time; | |
840 | u32 device_disconnect_time; | |
841 | u32 control_unit_queuing_time; | |
842 | u32 device_active_only_time; | |
843 | u32 device_busy_time; | |
844 | u32 initial_command_response_time; | |
845 | u32 reserved[7]; | |
846 | }; | |
847 | ||
fc5019c5 CH |
848 | /* |
849 | * kmalloc only guarantees 8 byte alignment, but we need cmbe | |
1da177e4 | 850 | * pointers to be naturally aligned. Make sure to allocate |
fc5019c5 CH |
851 | * enough space for two cmbes. |
852 | */ | |
853 | static inline struct cmbe *cmbe_align(struct cmbe *c) | |
1da177e4 LT |
854 | { |
855 | unsigned long addr; | |
856 | addr = ((unsigned long)c + sizeof (struct cmbe) - sizeof(long)) & | |
857 | ~(sizeof (struct cmbe) - sizeof(long)); | |
858 | return (struct cmbe*)addr; | |
859 | } | |
860 | ||
fc5019c5 | 861 | static int alloc_cmbe(struct ccw_device *cdev) |
1da177e4 LT |
862 | { |
863 | struct cmbe *cmbe; | |
94bb0633 CH |
864 | struct cmb_data *cmb_data; |
865 | int ret; | |
866 | ||
867 | cmbe = kzalloc (sizeof (*cmbe) * 2, GFP_KERNEL); | |
1da177e4 LT |
868 | if (!cmbe) |
869 | return -ENOMEM; | |
94bb0633 CH |
870 | cmb_data = kzalloc(sizeof(struct cmb_data), GFP_KERNEL); |
871 | if (!cmb_data) { | |
872 | ret = -ENOMEM; | |
873 | goto out_free; | |
874 | } | |
875 | cmb_data->last_block = kzalloc(sizeof(struct cmbe), GFP_KERNEL); | |
876 | if (!cmb_data->last_block) { | |
877 | ret = -ENOMEM; | |
878 | goto out_free; | |
879 | } | |
880 | cmb_data->size = sizeof(struct cmbe); | |
1da177e4 LT |
881 | spin_lock_irq(cdev->ccwlock); |
882 | if (cdev->private->cmb) { | |
1da177e4 | 883 | spin_unlock_irq(cdev->ccwlock); |
94bb0633 CH |
884 | ret = -EBUSY; |
885 | goto out_free; | |
1da177e4 | 886 | } |
94bb0633 CH |
887 | cmb_data->hw_block = cmbe; |
888 | cdev->private->cmb = cmb_data; | |
1da177e4 LT |
889 | spin_unlock_irq(cdev->ccwlock); |
890 | ||
891 | /* activate global measurement if this is the first channel */ | |
892 | spin_lock(&cmb_area.lock); | |
893 | if (list_empty(&cmb_area.list)) | |
894 | cmf_activate(NULL, 1); | |
895 | list_add_tail(&cdev->private->cmb_list, &cmb_area.list); | |
896 | spin_unlock(&cmb_area.lock); | |
897 | ||
898 | return 0; | |
94bb0633 CH |
899 | out_free: |
900 | if (cmb_data) | |
901 | kfree(cmb_data->last_block); | |
902 | kfree(cmb_data); | |
903 | kfree(cmbe); | |
904 | return ret; | |
1da177e4 LT |
905 | } |
906 | ||
fc5019c5 | 907 | static void free_cmbe(struct ccw_device *cdev) |
1da177e4 | 908 | { |
94bb0633 CH |
909 | struct cmb_data *cmb_data; |
910 | ||
1da177e4 | 911 | spin_lock_irq(cdev->ccwlock); |
94bb0633 | 912 | cmb_data = cdev->private->cmb; |
1da177e4 | 913 | cdev->private->cmb = NULL; |
94bb0633 CH |
914 | if (cmb_data) |
915 | kfree(cmb_data->last_block); | |
916 | kfree(cmb_data); | |
1da177e4 LT |
917 | spin_unlock_irq(cdev->ccwlock); |
918 | ||
919 | /* deactivate global measurement if this is the last channel */ | |
920 | spin_lock(&cmb_area.lock); | |
921 | list_del_init(&cdev->private->cmb_list); | |
922 | if (list_empty(&cmb_area.list)) | |
923 | cmf_activate(NULL, 0); | |
924 | spin_unlock(&cmb_area.lock); | |
925 | } | |
926 | ||
94bb0633 | 927 | static int set_cmbe(struct ccw_device *cdev, u32 mme) |
1da177e4 LT |
928 | { |
929 | unsigned long mba; | |
94bb0633 CH |
930 | struct cmb_data *cmb_data; |
931 | unsigned long flags; | |
1da177e4 | 932 | |
94bb0633 CH |
933 | spin_lock_irqsave(cdev->ccwlock, flags); |
934 | if (!cdev->private->cmb) { | |
935 | spin_unlock_irqrestore(cdev->ccwlock, flags); | |
1da177e4 | 936 | return -EINVAL; |
94bb0633 CH |
937 | } |
938 | cmb_data = cdev->private->cmb; | |
939 | mba = mme ? (unsigned long) cmbe_align(cmb_data->hw_block) : 0; | |
940 | spin_unlock_irqrestore(cdev->ccwlock, flags); | |
1da177e4 LT |
941 | |
942 | return set_schib_wait(cdev, mme, 1, mba); | |
943 | } | |
944 | ||
945 | ||
fc5019c5 | 946 | static u64 read_cmbe(struct ccw_device *cdev, int index) |
1da177e4 | 947 | { |
94bb0633 CH |
948 | struct cmbe *cmb; |
949 | struct cmb_data *cmb_data; | |
1da177e4 | 950 | u32 val; |
94bb0633 CH |
951 | int ret; |
952 | unsigned long flags; | |
1da177e4 | 953 | |
94bb0633 CH |
954 | ret = cmf_cmb_copy_wait(cdev); |
955 | if (ret < 0) | |
1da177e4 | 956 | return 0; |
1da177e4 | 957 | |
94bb0633 CH |
958 | spin_lock_irqsave(cdev->ccwlock, flags); |
959 | cmb_data = cdev->private->cmb; | |
960 | if (!cmb_data) { | |
961 | ret = 0; | |
962 | goto out; | |
963 | } | |
964 | cmb = cmb_data->last_block; | |
1da177e4 LT |
965 | |
966 | switch (index) { | |
967 | case cmb_ssch_rsch_count: | |
94bb0633 CH |
968 | ret = cmb->ssch_rsch_count; |
969 | goto out; | |
1da177e4 | 970 | case cmb_sample_count: |
94bb0633 CH |
971 | ret = cmb->sample_count; |
972 | goto out; | |
1da177e4 | 973 | case cmb_device_connect_time: |
94bb0633 | 974 | val = cmb->device_connect_time; |
1da177e4 LT |
975 | break; |
976 | case cmb_function_pending_time: | |
94bb0633 | 977 | val = cmb->function_pending_time; |
1da177e4 LT |
978 | break; |
979 | case cmb_device_disconnect_time: | |
94bb0633 | 980 | val = cmb->device_disconnect_time; |
1da177e4 LT |
981 | break; |
982 | case cmb_control_unit_queuing_time: | |
94bb0633 | 983 | val = cmb->control_unit_queuing_time; |
1da177e4 LT |
984 | break; |
985 | case cmb_device_active_only_time: | |
94bb0633 | 986 | val = cmb->device_active_only_time; |
1da177e4 LT |
987 | break; |
988 | case cmb_device_busy_time: | |
94bb0633 | 989 | val = cmb->device_busy_time; |
1da177e4 LT |
990 | break; |
991 | case cmb_initial_command_response_time: | |
94bb0633 | 992 | val = cmb->initial_command_response_time; |
1da177e4 LT |
993 | break; |
994 | default: | |
94bb0633 CH |
995 | ret = 0; |
996 | goto out; | |
1da177e4 | 997 | } |
94bb0633 CH |
998 | ret = time_to_avg_nsec(val, cmb->sample_count); |
999 | out: | |
1000 | spin_unlock_irqrestore(cdev->ccwlock, flags); | |
1001 | return ret; | |
1da177e4 LT |
1002 | } |
1003 | ||
fc5019c5 | 1004 | static int readall_cmbe(struct ccw_device *cdev, struct cmbdata *data) |
1da177e4 | 1005 | { |
94bb0633 CH |
1006 | struct cmbe *cmb; |
1007 | struct cmb_data *cmb_data; | |
1da177e4 | 1008 | u64 time; |
94bb0633 CH |
1009 | unsigned long flags; |
1010 | int ret; | |
1da177e4 | 1011 | |
94bb0633 CH |
1012 | ret = cmf_cmb_copy_wait(cdev); |
1013 | if (ret < 0) | |
1014 | return ret; | |
1da177e4 | 1015 | spin_lock_irqsave(cdev->ccwlock, flags); |
94bb0633 CH |
1016 | cmb_data = cdev->private->cmb; |
1017 | if (!cmb_data) { | |
1018 | ret = -ENODEV; | |
1019 | goto out; | |
1da177e4 | 1020 | } |
94bb0633 CH |
1021 | if (cmb_data->last_update == 0) { |
1022 | ret = -EAGAIN; | |
1023 | goto out; | |
1024 | } | |
1025 | time = cmb_data->last_update - cdev->private->cmb_start_time; | |
1da177e4 LT |
1026 | |
1027 | memset (data, 0, sizeof(struct cmbdata)); | |
1028 | ||
1029 | /* we only know values before device_busy_time */ | |
1030 | data->size = offsetof(struct cmbdata, device_busy_time); | |
1031 | ||
1032 | /* conver to nanoseconds */ | |
1033 | data->elapsed_time = (time * 1000) >> 12; | |
1034 | ||
94bb0633 | 1035 | cmb = cmb_data->last_block; |
1da177e4 | 1036 | /* copy data to new structure */ |
94bb0633 CH |
1037 | data->ssch_rsch_count = cmb->ssch_rsch_count; |
1038 | data->sample_count = cmb->sample_count; | |
1da177e4 LT |
1039 | |
1040 | /* time fields are converted to nanoseconds while copying */ | |
94bb0633 CH |
1041 | data->device_connect_time = time_to_nsec(cmb->device_connect_time); |
1042 | data->function_pending_time = time_to_nsec(cmb->function_pending_time); | |
1043 | data->device_disconnect_time = | |
1044 | time_to_nsec(cmb->device_disconnect_time); | |
1da177e4 | 1045 | data->control_unit_queuing_time |
94bb0633 | 1046 | = time_to_nsec(cmb->control_unit_queuing_time); |
1da177e4 | 1047 | data->device_active_only_time |
94bb0633 CH |
1048 | = time_to_nsec(cmb->device_active_only_time); |
1049 | data->device_busy_time = time_to_nsec(cmb->device_busy_time); | |
1da177e4 | 1050 | data->initial_command_response_time |
94bb0633 | 1051 | = time_to_nsec(cmb->initial_command_response_time); |
1da177e4 | 1052 | |
94bb0633 CH |
1053 | ret = 0; |
1054 | out: | |
1055 | spin_unlock_irqrestore(cdev->ccwlock, flags); | |
1056 | return ret; | |
1da177e4 LT |
1057 | } |
1058 | ||
94bb0633 | 1059 | static void reset_cmbe(struct ccw_device *cdev) |
1da177e4 | 1060 | { |
94bb0633 CH |
1061 | cmf_generic_reset(cdev); |
1062 | } | |
1063 | ||
1064 | static void * align_cmbe(void *area) | |
1065 | { | |
1066 | return cmbe_align(area); | |
1da177e4 LT |
1067 | } |
1068 | ||
1069 | static struct attribute_group cmf_attr_group_ext; | |
1070 | ||
1071 | static struct cmb_operations cmbops_extended = { | |
1072 | .alloc = alloc_cmbe, | |
1073 | .free = free_cmbe, | |
1074 | .set = set_cmbe, | |
1075 | .read = read_cmbe, | |
1076 | .readall = readall_cmbe, | |
1077 | .reset = reset_cmbe, | |
94bb0633 | 1078 | .align = align_cmbe, |
1da177e4 LT |
1079 | .attr_group = &cmf_attr_group_ext, |
1080 | }; | |
1da177e4 | 1081 | |
fc5019c5 | 1082 | static ssize_t cmb_show_attr(struct device *dev, char *buf, enum cmb_index idx) |
1da177e4 LT |
1083 | { |
1084 | return sprintf(buf, "%lld\n", | |
1085 | (unsigned long long) cmf_read(to_ccwdev(dev), idx)); | |
1086 | } | |
1087 | ||
fc5019c5 CH |
1088 | static ssize_t cmb_show_avg_sample_interval(struct device *dev, |
1089 | struct device_attribute *attr, | |
1090 | char *buf) | |
1da177e4 LT |
1091 | { |
1092 | struct ccw_device *cdev; | |
1093 | long interval; | |
1094 | unsigned long count; | |
94bb0633 | 1095 | struct cmb_data *cmb_data; |
1da177e4 LT |
1096 | |
1097 | cdev = to_ccwdev(dev); | |
1da177e4 | 1098 | count = cmf_read(cdev, cmb_sample_count); |
94bb0633 CH |
1099 | spin_lock_irq(cdev->ccwlock); |
1100 | cmb_data = cdev->private->cmb; | |
1101 | if (count) { | |
1102 | interval = cmb_data->last_update - | |
1103 | cdev->private->cmb_start_time; | |
13ffa927 | 1104 | interval = (interval * 1000) >> 12; |
1da177e4 | 1105 | interval /= count; |
94bb0633 | 1106 | } else |
1da177e4 | 1107 | interval = -1; |
94bb0633 | 1108 | spin_unlock_irq(cdev->ccwlock); |
1da177e4 LT |
1109 | return sprintf(buf, "%ld\n", interval); |
1110 | } | |
1111 | ||
fc5019c5 CH |
1112 | static ssize_t cmb_show_avg_utilization(struct device *dev, |
1113 | struct device_attribute *attr, | |
1114 | char *buf) | |
1da177e4 LT |
1115 | { |
1116 | struct cmbdata data; | |
1117 | u64 utilization; | |
1118 | unsigned long t, u; | |
1119 | int ret; | |
1120 | ||
1121 | ret = cmf_readall(to_ccwdev(dev), &data); | |
94bb0633 CH |
1122 | if (ret == -EAGAIN || ret == -ENODEV) |
1123 | /* No data (yet/currently) available to use for calculation. */ | |
1124 | return sprintf(buf, "n/a\n"); | |
1125 | else if (ret) | |
1da177e4 LT |
1126 | return ret; |
1127 | ||
1128 | utilization = data.device_connect_time + | |
1129 | data.function_pending_time + | |
1130 | data.device_disconnect_time; | |
1131 | ||
1132 | /* shift to avoid long long division */ | |
1133 | while (-1ul < (data.elapsed_time | utilization)) { | |
1134 | utilization >>= 8; | |
1135 | data.elapsed_time >>= 8; | |
1136 | } | |
1137 | ||
1138 | /* calculate value in 0.1 percent units */ | |
1139 | t = (unsigned long) data.elapsed_time / 1000; | |
1140 | u = (unsigned long) utilization / t; | |
1141 | ||
1142 | return sprintf(buf, "%02ld.%01ld%%\n", u/ 10, u - (u/ 10) * 10); | |
1143 | } | |
1144 | ||
1145 | #define cmf_attr(name) \ | |
fc5019c5 CH |
1146 | static ssize_t show_##name(struct device *dev, \ |
1147 | struct device_attribute *attr, char *buf) \ | |
1148 | { return cmb_show_attr((dev), buf, cmb_##name); } \ | |
1149 | static DEVICE_ATTR(name, 0444, show_##name, NULL); | |
1da177e4 LT |
1150 | |
1151 | #define cmf_attr_avg(name) \ | |
fc5019c5 CH |
1152 | static ssize_t show_avg_##name(struct device *dev, \ |
1153 | struct device_attribute *attr, char *buf) \ | |
1154 | { return cmb_show_attr((dev), buf, cmb_##name); } \ | |
1155 | static DEVICE_ATTR(avg_##name, 0444, show_avg_##name, NULL); | |
1da177e4 LT |
1156 | |
1157 | cmf_attr(ssch_rsch_count); | |
1158 | cmf_attr(sample_count); | |
1159 | cmf_attr_avg(device_connect_time); | |
1160 | cmf_attr_avg(function_pending_time); | |
1161 | cmf_attr_avg(device_disconnect_time); | |
1162 | cmf_attr_avg(control_unit_queuing_time); | |
1163 | cmf_attr_avg(device_active_only_time); | |
1164 | cmf_attr_avg(device_busy_time); | |
1165 | cmf_attr_avg(initial_command_response_time); | |
1166 | ||
fc5019c5 CH |
1167 | static DEVICE_ATTR(avg_sample_interval, 0444, cmb_show_avg_sample_interval, |
1168 | NULL); | |
1da177e4 LT |
1169 | static DEVICE_ATTR(avg_utilization, 0444, cmb_show_avg_utilization, NULL); |
1170 | ||
1171 | static struct attribute *cmf_attributes[] = { | |
1172 | &dev_attr_avg_sample_interval.attr, | |
1173 | &dev_attr_avg_utilization.attr, | |
1174 | &dev_attr_ssch_rsch_count.attr, | |
1175 | &dev_attr_sample_count.attr, | |
1176 | &dev_attr_avg_device_connect_time.attr, | |
1177 | &dev_attr_avg_function_pending_time.attr, | |
1178 | &dev_attr_avg_device_disconnect_time.attr, | |
1179 | &dev_attr_avg_control_unit_queuing_time.attr, | |
1180 | &dev_attr_avg_device_active_only_time.attr, | |
d2c993d8 | 1181 | NULL, |
1da177e4 LT |
1182 | }; |
1183 | ||
1184 | static struct attribute_group cmf_attr_group = { | |
1185 | .name = "cmf", | |
1186 | .attrs = cmf_attributes, | |
1187 | }; | |
1188 | ||
1189 | static struct attribute *cmf_attributes_ext[] = { | |
1190 | &dev_attr_avg_sample_interval.attr, | |
1191 | &dev_attr_avg_utilization.attr, | |
1192 | &dev_attr_ssch_rsch_count.attr, | |
1193 | &dev_attr_sample_count.attr, | |
1194 | &dev_attr_avg_device_connect_time.attr, | |
1195 | &dev_attr_avg_function_pending_time.attr, | |
1196 | &dev_attr_avg_device_disconnect_time.attr, | |
1197 | &dev_attr_avg_control_unit_queuing_time.attr, | |
1198 | &dev_attr_avg_device_active_only_time.attr, | |
1199 | &dev_attr_avg_device_busy_time.attr, | |
1200 | &dev_attr_avg_initial_command_response_time.attr, | |
d2c993d8 | 1201 | NULL, |
1da177e4 LT |
1202 | }; |
1203 | ||
1204 | static struct attribute_group cmf_attr_group_ext = { | |
1205 | .name = "cmf", | |
1206 | .attrs = cmf_attributes_ext, | |
1207 | }; | |
1208 | ||
fc5019c5 CH |
1209 | static ssize_t cmb_enable_show(struct device *dev, |
1210 | struct device_attribute *attr, | |
1211 | char *buf) | |
1da177e4 LT |
1212 | { |
1213 | return sprintf(buf, "%d\n", to_ccwdev(dev)->private->cmb ? 1 : 0); | |
1214 | } | |
1215 | ||
fc5019c5 CH |
1216 | static ssize_t cmb_enable_store(struct device *dev, |
1217 | struct device_attribute *attr, const char *buf, | |
1218 | size_t c) | |
1da177e4 LT |
1219 | { |
1220 | struct ccw_device *cdev; | |
1221 | int ret; | |
1222 | ||
1223 | cdev = to_ccwdev(dev); | |
1224 | ||
1225 | switch (buf[0]) { | |
1226 | case '0': | |
1227 | ret = disable_cmf(cdev); | |
1228 | if (ret) | |
e556bbbd | 1229 | dev_info(&cdev->dev, "disable_cmf failed (%d)\n", ret); |
1da177e4 LT |
1230 | break; |
1231 | case '1': | |
1232 | ret = enable_cmf(cdev); | |
1233 | if (ret && ret != -EBUSY) | |
e556bbbd | 1234 | dev_info(&cdev->dev, "enable_cmf failed (%d)\n", ret); |
1da177e4 LT |
1235 | break; |
1236 | } | |
1237 | ||
1238 | return c; | |
1239 | } | |
1240 | ||
1241 | DEVICE_ATTR(cmb_enable, 0644, cmb_enable_show, cmb_enable_store); | |
1242 | ||
c0208716 CH |
1243 | /** |
1244 | * enable_cmf() - switch on the channel measurement for a specific device | |
1245 | * @cdev: The ccw device to be enabled | |
1246 | * | |
1247 | * Returns %0 for success or a negative error value. | |
1248 | * | |
1249 | * Context: | |
1250 | * non-atomic | |
1251 | */ | |
fc5019c5 | 1252 | int enable_cmf(struct ccw_device *cdev) |
1da177e4 LT |
1253 | { |
1254 | int ret; | |
1255 | ||
1256 | ret = cmbops->alloc(cdev); | |
1257 | cmbops->reset(cdev); | |
1258 | if (ret) | |
1259 | return ret; | |
1260 | ret = cmbops->set(cdev, 2); | |
1261 | if (ret) { | |
1262 | cmbops->free(cdev); | |
1263 | return ret; | |
1264 | } | |
1265 | ret = sysfs_create_group(&cdev->dev.kobj, cmbops->attr_group); | |
1266 | if (!ret) | |
1267 | return 0; | |
1268 | cmbops->set(cdev, 0); //FIXME: this can fail | |
1269 | cmbops->free(cdev); | |
1270 | return ret; | |
1271 | } | |
1272 | ||
c0208716 CH |
1273 | /** |
1274 | * disable_cmf() - switch off the channel measurement for a specific device | |
1275 | * @cdev: The ccw device to be disabled | |
1276 | * | |
1277 | * Returns %0 for success or a negative error value. | |
1278 | * | |
1279 | * Context: | |
1280 | * non-atomic | |
1281 | */ | |
fc5019c5 | 1282 | int disable_cmf(struct ccw_device *cdev) |
1da177e4 LT |
1283 | { |
1284 | int ret; | |
1285 | ||
1286 | ret = cmbops->set(cdev, 0); | |
1287 | if (ret) | |
1288 | return ret; | |
1289 | cmbops->free(cdev); | |
1290 | sysfs_remove_group(&cdev->dev.kobj, cmbops->attr_group); | |
1291 | return ret; | |
1292 | } | |
1293 | ||
c0208716 CH |
1294 | /** |
1295 | * cmf_read() - read one value from the current channel measurement block | |
1296 | * @cdev: the channel to be read | |
1297 | * @index: the index of the value to be read | |
1298 | * | |
1299 | * Returns the value read or %0 if the value cannot be read. | |
1300 | * | |
1301 | * Context: | |
1302 | * any | |
1303 | */ | |
fc5019c5 | 1304 | u64 cmf_read(struct ccw_device *cdev, int index) |
1da177e4 LT |
1305 | { |
1306 | return cmbops->read(cdev, index); | |
1307 | } | |
1308 | ||
c0208716 CH |
1309 | /** |
1310 | * cmf_readall() - read the current channel measurement block | |
1311 | * @cdev: the channel to be read | |
1312 | * @data: a pointer to a data block that will be filled | |
1313 | * | |
1314 | * Returns %0 on success, a negative error value otherwise. | |
1315 | * | |
1316 | * Context: | |
1317 | * any | |
1318 | */ | |
fc5019c5 | 1319 | int cmf_readall(struct ccw_device *cdev, struct cmbdata *data) |
1da177e4 LT |
1320 | { |
1321 | return cmbops->readall(cdev, data); | |
1322 | } | |
1323 | ||
94bb0633 CH |
1324 | /* Reenable cmf when a disconnected device becomes available again. */ |
1325 | int cmf_reenable(struct ccw_device *cdev) | |
1326 | { | |
1327 | cmbops->reset(cdev); | |
1328 | return cmbops->set(cdev, 2); | |
1329 | } | |
1330 | ||
fc5019c5 | 1331 | static int __init init_cmf(void) |
1da177e4 LT |
1332 | { |
1333 | char *format_string; | |
1334 | char *detect_string = "parameter"; | |
1335 | ||
fc5019c5 CH |
1336 | /* |
1337 | * If the user did not give a parameter, see if we are running on a | |
1338 | * machine supporting extended measurement blocks, otherwise fall back | |
1339 | * to basic mode. | |
1340 | */ | |
1da177e4 LT |
1341 | if (format == CMF_AUTODETECT) { |
1342 | if (!css_characteristics_avail || | |
1343 | !css_general_characteristics.ext_mb) { | |
1344 | format = CMF_BASIC; | |
1345 | } else { | |
1346 | format = CMF_EXTENDED; | |
1347 | } | |
1348 | detect_string = "autodetected"; | |
1349 | } else { | |
1350 | detect_string = "parameter"; | |
1351 | } | |
1352 | ||
1353 | switch (format) { | |
1354 | case CMF_BASIC: | |
1355 | format_string = "basic"; | |
1356 | cmbops = &cmbops_basic; | |
1da177e4 LT |
1357 | break; |
1358 | case CMF_EXTENDED: | |
fc5019c5 | 1359 | format_string = "extended"; |
1da177e4 LT |
1360 | cmbops = &cmbops_extended; |
1361 | break; | |
1362 | default: | |
e556bbbd | 1363 | printk(KERN_ERR "cio: Invalid format %d for channel " |
1da177e4 LT |
1364 | "measurement facility\n", format); |
1365 | return 1; | |
1366 | } | |
1367 | ||
e556bbbd CH |
1368 | printk(KERN_INFO "cio: Channel measurement facility using %s " |
1369 | "format (%s)\n", format_string, detect_string); | |
1da177e4 LT |
1370 | return 0; |
1371 | } | |
1372 | ||
1373 | module_init(init_cmf); | |
1374 | ||
1375 | ||
1376 | MODULE_AUTHOR("Arnd Bergmann <arndb@de.ibm.com>"); | |
1377 | MODULE_LICENSE("GPL"); | |
1378 | MODULE_DESCRIPTION("channel measurement facility base driver\n" | |
1379 | "Copyright 2003 IBM Corporation\n"); | |
1380 | ||
1381 | EXPORT_SYMBOL_GPL(enable_cmf); | |
1382 | EXPORT_SYMBOL_GPL(disable_cmf); | |
1383 | EXPORT_SYMBOL_GPL(cmf_read); | |
1384 | EXPORT_SYMBOL_GPL(cmf_readall); |