2 * linux/drivers/s390/cio/cmf.c
4 * Linux on zSeries Channel Measurement Facility support
6 * Copyright 2000,2006 IBM Corporation
8 * Authors: Arnd Bergmann <arndb@de.ibm.com>
9 * Cornelia Huck <cornelia.huck@de.ibm.com>
11 * original idea from Natarajan Krishnaswami <nkrishna@us.ibm.com>
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)
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.
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.
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>
34 #include <linux/slab.h>
35 #include <linux/timex.h> /* get_clock() */
37 #include <asm/ccwdev.h>
40 #include <asm/div64.h>
49 * parameter to enable cmf during boot, possible uses are:
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
56 #define ARGSTRING "s390cmf"
58 /* indices for READCMB */
60 /* basic and exended format: */
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: */
70 cmb_initial_command_response_time,
74 * enum cmb_format - types of supported measurement block formats
76 * @CMF_BASIC: traditional channel measurement blocks supported
77 * by all machines that we run on
78 * @CMF_EXTENDED: improved format that was introduced with the z990
80 * @CMF_AUTODETECT: default: use extended format when running on a machine
81 * supporting extended format, otherwise fall back to
91 * format - actual format for all measurement blocks
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
97 static int format = CMF_AUTODETECT;
98 module_param(format, bool, 0444);
101 * struct cmb_operations - functions to use depending on cmb_format
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.
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
111 * @read: read a measurement entry at an index
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
115 * @align: align an allocated block so that the hardware can use it
117 struct cmb_operations {
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 *);
126 struct attribute_group *attr_group;
128 static struct cmb_operations *cmbops;
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 */
138 * Our user interface is designed in terms of nanoseconds,
139 * while the hardware measures total times in its own
142 static inline u64 time_to_nsec(u32 value)
144 return ((u64)value) * 128000ull;
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.
153 static inline u64 time_to_avg_nsec(u32 value, u32 count)
157 /* no samples yet, avoid division by 0 */
161 /* value comes in units of 128 µsec */
162 ret = time_to_nsec(value);
169 * Activate or deactivate the channel monitor. When area is NULL,
170 * the monitor is deactivated. The channel monitor needs to
171 * be active in order to measure subchannels, which also need
174 static inline void cmf_activate(void *area, unsigned int onoff)
176 register void * __gpr2 asm("2");
177 register long __gpr1 asm("1");
180 __gpr1 = onoff ? 2 : 0;
181 /* activate channel measurement */
182 asm("schm" : : "d" (__gpr2), "d" (__gpr1) );
185 static int set_schib(struct ccw_device *cdev, u32 mme, int mbfc,
186 unsigned long address)
190 struct subchannel *sch;
193 sch = to_subchannel(cdev->dev.parent);
195 /* msch can silently fail, so do it again if necessary */
196 for (retry = 0; retry < 3; retry++) {
198 if (cio_update_schib(sch))
200 schib->pmcw.mme = mme;
201 schib->pmcw.mbfc = mbfc;
202 /* address can be either a block address or a block index */
204 schib->mba = address;
206 schib->pmcw.mbi = address;
208 /* try to submit it */
209 switch(ret = msch_err(sch->schid, schib)) {
213 case 2: /* in I/O or status pending */
216 case 3: /* subchannel is no longer valid */
219 default: /* msch caught an exception */
223 if (cio_update_schib(sch))
229 /* check if it worked */
230 if (schib->pmcw.mme == mme &&
231 schib->pmcw.mbfc == mbfc &&
232 (mbfc ? (schib->mba == address)
233 : (schib->pmcw.mbi == address)))
242 struct set_schib_struct {
245 unsigned long address;
246 wait_queue_head_t wait;
251 static void cmf_set_schib_release(struct kref *kref)
253 struct set_schib_struct *set_data;
255 set_data = container_of(kref, struct set_schib_struct, kref);
259 #define CMF_PENDING 1
261 static int set_schib_wait(struct ccw_device *cdev, u32 mme,
262 int mbfc, unsigned long address)
264 struct set_schib_struct *set_data;
267 spin_lock_irq(cdev->ccwlock);
268 if (!cdev->private->cmb) {
272 set_data = kzalloc(sizeof(struct set_schib_struct), GFP_ATOMIC);
277 init_waitqueue_head(&set_data->wait);
278 kref_init(&set_data->kref);
280 set_data->mbfc = mbfc;
281 set_data->address = address;
283 ret = set_schib(cdev, mme, mbfc, address);
287 if (cdev->private->state != DEV_STATE_ONLINE) {
288 /* if the device is not online, don't even try again */
293 cdev->private->state = DEV_STATE_CMFCHANGE;
294 set_data->ret = CMF_PENDING;
295 cdev->private->cmb_wait = set_data;
297 spin_unlock_irq(cdev->ccwlock);
298 if (wait_event_interruptible(set_data->wait,
299 set_data->ret != CMF_PENDING)) {
300 spin_lock_irq(cdev->ccwlock);
301 if (set_data->ret == CMF_PENDING) {
302 set_data->ret = -ERESTARTSYS;
303 if (cdev->private->state == DEV_STATE_CMFCHANGE)
304 cdev->private->state = DEV_STATE_ONLINE;
306 spin_unlock_irq(cdev->ccwlock);
308 spin_lock_irq(cdev->ccwlock);
309 cdev->private->cmb_wait = NULL;
312 kref_put(&set_data->kref, cmf_set_schib_release);
314 spin_unlock_irq(cdev->ccwlock);
318 void retry_set_schib(struct ccw_device *cdev)
320 struct set_schib_struct *set_data;
322 set_data = cdev->private->cmb_wait;
327 kref_get(&set_data->kref);
328 set_data->ret = set_schib(cdev, set_data->mme, set_data->mbfc,
330 wake_up(&set_data->wait);
331 kref_put(&set_data->kref, cmf_set_schib_release);
334 static int cmf_copy_block(struct ccw_device *cdev)
336 struct subchannel *sch;
339 struct cmb_data *cmb_data;
341 sch = to_subchannel(cdev->dev.parent);
343 if (cio_update_schib(sch))
346 if (scsw_fctl(&sch->schib.scsw) & SCSW_FCTL_START_FUNC) {
347 /* Don't copy if a start function is in progress. */
348 if ((!(scsw_actl(&sch->schib.scsw) & SCSW_ACTL_SUSPENDED)) &&
349 (scsw_actl(&sch->schib.scsw) &
350 (SCSW_ACTL_DEVACT | SCSW_ACTL_SCHACT)) &&
351 (!(scsw_stctl(&sch->schib.scsw) & SCSW_STCTL_SEC_STATUS)))
354 cmb_data = cdev->private->cmb;
355 hw_block = cmbops->align(cmb_data->hw_block);
356 if (!memcmp(cmb_data->last_block, hw_block, cmb_data->size))
357 /* No need to copy. */
359 reference_buf = kzalloc(cmb_data->size, GFP_ATOMIC);
362 /* Ensure consistency of block copied from hardware. */
364 memcpy(cmb_data->last_block, hw_block, cmb_data->size);
365 memcpy(reference_buf, hw_block, cmb_data->size);
366 } while (memcmp(cmb_data->last_block, reference_buf, cmb_data->size));
367 cmb_data->last_update = get_clock();
368 kfree(reference_buf);
372 struct copy_block_struct {
373 wait_queue_head_t wait;
378 static void cmf_copy_block_release(struct kref *kref)
380 struct copy_block_struct *copy_block;
382 copy_block = container_of(kref, struct copy_block_struct, kref);
386 static int cmf_cmb_copy_wait(struct ccw_device *cdev)
388 struct copy_block_struct *copy_block;
392 spin_lock_irqsave(cdev->ccwlock, flags);
393 if (!cdev->private->cmb) {
397 copy_block = kzalloc(sizeof(struct copy_block_struct), GFP_ATOMIC);
402 init_waitqueue_head(©_block->wait);
403 kref_init(©_block->kref);
405 ret = cmf_copy_block(cdev);
409 if (cdev->private->state != DEV_STATE_ONLINE) {
414 cdev->private->state = DEV_STATE_CMFUPDATE;
415 copy_block->ret = CMF_PENDING;
416 cdev->private->cmb_wait = copy_block;
418 spin_unlock_irqrestore(cdev->ccwlock, flags);
419 if (wait_event_interruptible(copy_block->wait,
420 copy_block->ret != CMF_PENDING)) {
421 spin_lock_irqsave(cdev->ccwlock, flags);
422 if (copy_block->ret == CMF_PENDING) {
423 copy_block->ret = -ERESTARTSYS;
424 if (cdev->private->state == DEV_STATE_CMFUPDATE)
425 cdev->private->state = DEV_STATE_ONLINE;
427 spin_unlock_irqrestore(cdev->ccwlock, flags);
429 spin_lock_irqsave(cdev->ccwlock, flags);
430 cdev->private->cmb_wait = NULL;
431 ret = copy_block->ret;
433 kref_put(©_block->kref, cmf_copy_block_release);
435 spin_unlock_irqrestore(cdev->ccwlock, flags);
439 void cmf_retry_copy_block(struct ccw_device *cdev)
441 struct copy_block_struct *copy_block;
443 copy_block = cdev->private->cmb_wait;
448 kref_get(©_block->kref);
449 copy_block->ret = cmf_copy_block(cdev);
450 wake_up(©_block->wait);
451 kref_put(©_block->kref, cmf_copy_block_release);
454 static void cmf_generic_reset(struct ccw_device *cdev)
456 struct cmb_data *cmb_data;
458 spin_lock_irq(cdev->ccwlock);
459 cmb_data = cdev->private->cmb;
461 memset(cmb_data->last_block, 0, cmb_data->size);
463 * Need to reset hw block as well to make the hardware start
466 memset(cmbops->align(cmb_data->hw_block), 0, cmb_data->size);
467 cmb_data->last_update = 0;
469 cdev->private->cmb_start_time = get_clock();
470 spin_unlock_irq(cdev->ccwlock);
474 * struct cmb_area - container for global cmb data
476 * @mem: pointer to CMBs (only in basic measurement mode)
477 * @list: contains a linked list of all subchannels
478 * @num_channels: number of channels to be measured
479 * @lock: protect concurrent access to @mem and @list
483 struct list_head list;
488 static struct cmb_area cmb_area = {
489 .lock = __SPIN_LOCK_UNLOCKED(cmb_area.lock),
490 .list = LIST_HEAD_INIT(cmb_area.list),
491 .num_channels = 1024,
494 /* ****** old style CMB handling ********/
497 * Basic channel measurement blocks are allocated in one contiguous
498 * block of memory, which can not be moved as long as any channel
499 * is active. Therefore, a maximum number of subchannels needs to
500 * be defined somewhere. This is a module parameter, defaulting to
501 * a resonable value of 1024, or 32 kb of memory.
502 * Current kernels don't allow kmalloc with more than 128kb, so the
506 module_param_named(maxchannels, cmb_area.num_channels, uint, 0444);
509 * struct cmb - basic channel measurement block
510 * @ssch_rsch_count: number of ssch and rsch
511 * @sample_count: number of samples
512 * @device_connect_time: time of device connect
513 * @function_pending_time: time of function pending
514 * @device_disconnect_time: time of device disconnect
515 * @control_unit_queuing_time: time of control unit queuing
516 * @device_active_only_time: time of device active only
517 * @reserved: unused in basic measurement mode
519 * The measurement block as used by the hardware. The fields are described
520 * further in z/Architecture Principles of Operation, chapter 17.
522 * The cmb area made up from these blocks must be a contiguous array and may
523 * not be reallocated or freed.
524 * Only one cmb area can be present in the system.
529 u32 device_connect_time;
530 u32 function_pending_time;
531 u32 device_disconnect_time;
532 u32 control_unit_queuing_time;
533 u32 device_active_only_time;
538 * Insert a single device into the cmb_area list.
539 * Called with cmb_area.lock held from alloc_cmb.
541 static int alloc_cmb_single(struct ccw_device *cdev,
542 struct cmb_data *cmb_data)
545 struct ccw_device_private *node;
548 spin_lock_irq(cdev->ccwlock);
549 if (!list_empty(&cdev->private->cmb_list)) {
555 * Find first unused cmb in cmb_area.mem.
556 * This is a little tricky: cmb_area.list
557 * remains sorted by ->cmb->hw_data pointers.
560 list_for_each_entry(node, &cmb_area.list, cmb_list) {
561 struct cmb_data *data;
563 if ((struct cmb*)data->hw_block > cmb)
567 if (cmb - cmb_area.mem >= cmb_area.num_channels) {
573 list_add_tail(&cdev->private->cmb_list, &node->cmb_list);
574 cmb_data->hw_block = cmb;
575 cdev->private->cmb = cmb_data;
578 spin_unlock_irq(cdev->ccwlock);
582 static int alloc_cmb(struct ccw_device *cdev)
587 struct cmb_data *cmb_data;
589 /* Allocate private cmb_data. */
590 cmb_data = kzalloc(sizeof(struct cmb_data), GFP_KERNEL);
594 cmb_data->last_block = kzalloc(sizeof(struct cmb), GFP_KERNEL);
595 if (!cmb_data->last_block) {
599 cmb_data->size = sizeof(struct cmb);
600 spin_lock(&cmb_area.lock);
603 /* there is no user yet, so we need a new area */
604 size = sizeof(struct cmb) * cmb_area.num_channels;
605 WARN_ON(!list_empty(&cmb_area.list));
607 spin_unlock(&cmb_area.lock);
608 mem = (void*)__get_free_pages(GFP_KERNEL | GFP_DMA,
610 spin_lock(&cmb_area.lock);
613 /* ok, another thread was faster */
614 free_pages((unsigned long)mem, get_order(size));
621 memset(mem, 0, size);
623 cmf_activate(cmb_area.mem, 1);
627 /* do the actual allocation */
628 ret = alloc_cmb_single(cdev, cmb_data);
630 spin_unlock(&cmb_area.lock);
632 kfree(cmb_data->last_block);
638 static void free_cmb(struct ccw_device *cdev)
640 struct ccw_device_private *priv;
641 struct cmb_data *cmb_data;
643 spin_lock(&cmb_area.lock);
644 spin_lock_irq(cdev->ccwlock);
646 priv = cdev->private;
648 if (list_empty(&priv->cmb_list)) {
653 cmb_data = priv->cmb;
656 kfree(cmb_data->last_block);
658 list_del_init(&priv->cmb_list);
660 if (list_empty(&cmb_area.list)) {
662 size = sizeof(struct cmb) * cmb_area.num_channels;
663 cmf_activate(NULL, 0);
664 free_pages((unsigned long)cmb_area.mem, get_order(size));
668 spin_unlock_irq(cdev->ccwlock);
669 spin_unlock(&cmb_area.lock);
672 static int set_cmb(struct ccw_device *cdev, u32 mme)
675 struct cmb_data *cmb_data;
678 spin_lock_irqsave(cdev->ccwlock, flags);
679 if (!cdev->private->cmb) {
680 spin_unlock_irqrestore(cdev->ccwlock, flags);
683 cmb_data = cdev->private->cmb;
684 offset = mme ? (struct cmb *)cmb_data->hw_block - cmb_area.mem : 0;
685 spin_unlock_irqrestore(cdev->ccwlock, flags);
687 return set_schib_wait(cdev, mme, 0, offset);
690 static u64 read_cmb(struct ccw_device *cdev, int index)
697 ret = cmf_cmb_copy_wait(cdev);
701 spin_lock_irqsave(cdev->ccwlock, flags);
702 if (!cdev->private->cmb) {
706 cmb = ((struct cmb_data *)cdev->private->cmb)->last_block;
709 case cmb_ssch_rsch_count:
710 ret = cmb->ssch_rsch_count;
712 case cmb_sample_count:
713 ret = cmb->sample_count;
715 case cmb_device_connect_time:
716 val = cmb->device_connect_time;
718 case cmb_function_pending_time:
719 val = cmb->function_pending_time;
721 case cmb_device_disconnect_time:
722 val = cmb->device_disconnect_time;
724 case cmb_control_unit_queuing_time:
725 val = cmb->control_unit_queuing_time;
727 case cmb_device_active_only_time:
728 val = cmb->device_active_only_time;
734 ret = time_to_avg_nsec(val, cmb->sample_count);
736 spin_unlock_irqrestore(cdev->ccwlock, flags);
740 static int readall_cmb(struct ccw_device *cdev, struct cmbdata *data)
743 struct cmb_data *cmb_data;
748 ret = cmf_cmb_copy_wait(cdev);
751 spin_lock_irqsave(cdev->ccwlock, flags);
752 cmb_data = cdev->private->cmb;
757 if (cmb_data->last_update == 0) {
761 cmb = cmb_data->last_block;
762 time = cmb_data->last_update - cdev->private->cmb_start_time;
764 memset(data, 0, sizeof(struct cmbdata));
766 /* we only know values before device_busy_time */
767 data->size = offsetof(struct cmbdata, device_busy_time);
769 /* convert to nanoseconds */
770 data->elapsed_time = (time * 1000) >> 12;
772 /* copy data to new structure */
773 data->ssch_rsch_count = cmb->ssch_rsch_count;
774 data->sample_count = cmb->sample_count;
776 /* time fields are converted to nanoseconds while copying */
777 data->device_connect_time = time_to_nsec(cmb->device_connect_time);
778 data->function_pending_time = time_to_nsec(cmb->function_pending_time);
779 data->device_disconnect_time =
780 time_to_nsec(cmb->device_disconnect_time);
781 data->control_unit_queuing_time
782 = time_to_nsec(cmb->control_unit_queuing_time);
783 data->device_active_only_time
784 = time_to_nsec(cmb->device_active_only_time);
787 spin_unlock_irqrestore(cdev->ccwlock, flags);
791 static void reset_cmb(struct ccw_device *cdev)
793 cmf_generic_reset(cdev);
796 static void * align_cmb(void *area)
801 static struct attribute_group cmf_attr_group;
803 static struct cmb_operations cmbops_basic = {
808 .readall = readall_cmb,
811 .attr_group = &cmf_attr_group,
814 /* ******** extended cmb handling ********/
817 * struct cmbe - extended channel measurement block
818 * @ssch_rsch_count: number of ssch and rsch
819 * @sample_count: number of samples
820 * @device_connect_time: time of device connect
821 * @function_pending_time: time of function pending
822 * @device_disconnect_time: time of device disconnect
823 * @control_unit_queuing_time: time of control unit queuing
824 * @device_active_only_time: time of device active only
825 * @device_busy_time: time of device busy
826 * @initial_command_response_time: initial command response time
829 * The measurement block as used by the hardware. May be in any 64 bit physical
831 * The fields are described further in z/Architecture Principles of Operation,
832 * third edition, chapter 17.
837 u32 device_connect_time;
838 u32 function_pending_time;
839 u32 device_disconnect_time;
840 u32 control_unit_queuing_time;
841 u32 device_active_only_time;
842 u32 device_busy_time;
843 u32 initial_command_response_time;
848 * kmalloc only guarantees 8 byte alignment, but we need cmbe
849 * pointers to be naturally aligned. Make sure to allocate
850 * enough space for two cmbes.
852 static inline struct cmbe *cmbe_align(struct cmbe *c)
855 addr = ((unsigned long)c + sizeof (struct cmbe) - sizeof(long)) &
856 ~(sizeof (struct cmbe) - sizeof(long));
857 return (struct cmbe*)addr;
860 static int alloc_cmbe(struct ccw_device *cdev)
863 struct cmb_data *cmb_data;
866 cmbe = kzalloc (sizeof (*cmbe) * 2, GFP_KERNEL);
869 cmb_data = kzalloc(sizeof(struct cmb_data), GFP_KERNEL);
874 cmb_data->last_block = kzalloc(sizeof(struct cmbe), GFP_KERNEL);
875 if (!cmb_data->last_block) {
879 cmb_data->size = sizeof(struct cmbe);
880 spin_lock_irq(cdev->ccwlock);
881 if (cdev->private->cmb) {
882 spin_unlock_irq(cdev->ccwlock);
886 cmb_data->hw_block = cmbe;
887 cdev->private->cmb = cmb_data;
888 spin_unlock_irq(cdev->ccwlock);
890 /* activate global measurement if this is the first channel */
891 spin_lock(&cmb_area.lock);
892 if (list_empty(&cmb_area.list))
893 cmf_activate(NULL, 1);
894 list_add_tail(&cdev->private->cmb_list, &cmb_area.list);
895 spin_unlock(&cmb_area.lock);
900 kfree(cmb_data->last_block);
906 static void free_cmbe(struct ccw_device *cdev)
908 struct cmb_data *cmb_data;
910 spin_lock_irq(cdev->ccwlock);
911 cmb_data = cdev->private->cmb;
912 cdev->private->cmb = NULL;
914 kfree(cmb_data->last_block);
916 spin_unlock_irq(cdev->ccwlock);
918 /* deactivate global measurement if this is the last channel */
919 spin_lock(&cmb_area.lock);
920 list_del_init(&cdev->private->cmb_list);
921 if (list_empty(&cmb_area.list))
922 cmf_activate(NULL, 0);
923 spin_unlock(&cmb_area.lock);
926 static int set_cmbe(struct ccw_device *cdev, u32 mme)
929 struct cmb_data *cmb_data;
932 spin_lock_irqsave(cdev->ccwlock, flags);
933 if (!cdev->private->cmb) {
934 spin_unlock_irqrestore(cdev->ccwlock, flags);
937 cmb_data = cdev->private->cmb;
938 mba = mme ? (unsigned long) cmbe_align(cmb_data->hw_block) : 0;
939 spin_unlock_irqrestore(cdev->ccwlock, flags);
941 return set_schib_wait(cdev, mme, 1, mba);
945 static u64 read_cmbe(struct ccw_device *cdev, int index)
948 struct cmb_data *cmb_data;
953 ret = cmf_cmb_copy_wait(cdev);
957 spin_lock_irqsave(cdev->ccwlock, flags);
958 cmb_data = cdev->private->cmb;
963 cmb = cmb_data->last_block;
966 case cmb_ssch_rsch_count:
967 ret = cmb->ssch_rsch_count;
969 case cmb_sample_count:
970 ret = cmb->sample_count;
972 case cmb_device_connect_time:
973 val = cmb->device_connect_time;
975 case cmb_function_pending_time:
976 val = cmb->function_pending_time;
978 case cmb_device_disconnect_time:
979 val = cmb->device_disconnect_time;
981 case cmb_control_unit_queuing_time:
982 val = cmb->control_unit_queuing_time;
984 case cmb_device_active_only_time:
985 val = cmb->device_active_only_time;
987 case cmb_device_busy_time:
988 val = cmb->device_busy_time;
990 case cmb_initial_command_response_time:
991 val = cmb->initial_command_response_time;
997 ret = time_to_avg_nsec(val, cmb->sample_count);
999 spin_unlock_irqrestore(cdev->ccwlock, flags);
1003 static int readall_cmbe(struct ccw_device *cdev, struct cmbdata *data)
1006 struct cmb_data *cmb_data;
1008 unsigned long flags;
1011 ret = cmf_cmb_copy_wait(cdev);
1014 spin_lock_irqsave(cdev->ccwlock, flags);
1015 cmb_data = cdev->private->cmb;
1020 if (cmb_data->last_update == 0) {
1024 time = cmb_data->last_update - cdev->private->cmb_start_time;
1026 memset (data, 0, sizeof(struct cmbdata));
1028 /* we only know values before device_busy_time */
1029 data->size = offsetof(struct cmbdata, device_busy_time);
1031 /* conver to nanoseconds */
1032 data->elapsed_time = (time * 1000) >> 12;
1034 cmb = cmb_data->last_block;
1035 /* copy data to new structure */
1036 data->ssch_rsch_count = cmb->ssch_rsch_count;
1037 data->sample_count = cmb->sample_count;
1039 /* time fields are converted to nanoseconds while copying */
1040 data->device_connect_time = time_to_nsec(cmb->device_connect_time);
1041 data->function_pending_time = time_to_nsec(cmb->function_pending_time);
1042 data->device_disconnect_time =
1043 time_to_nsec(cmb->device_disconnect_time);
1044 data->control_unit_queuing_time
1045 = time_to_nsec(cmb->control_unit_queuing_time);
1046 data->device_active_only_time
1047 = time_to_nsec(cmb->device_active_only_time);
1048 data->device_busy_time = time_to_nsec(cmb->device_busy_time);
1049 data->initial_command_response_time
1050 = time_to_nsec(cmb->initial_command_response_time);
1054 spin_unlock_irqrestore(cdev->ccwlock, flags);
1058 static void reset_cmbe(struct ccw_device *cdev)
1060 cmf_generic_reset(cdev);
1063 static void * align_cmbe(void *area)
1065 return cmbe_align(area);
1068 static struct attribute_group cmf_attr_group_ext;
1070 static struct cmb_operations cmbops_extended = {
1071 .alloc = alloc_cmbe,
1075 .readall = readall_cmbe,
1076 .reset = reset_cmbe,
1077 .align = align_cmbe,
1078 .attr_group = &cmf_attr_group_ext,
1081 static ssize_t cmb_show_attr(struct device *dev, char *buf, enum cmb_index idx)
1083 return sprintf(buf, "%lld\n",
1084 (unsigned long long) cmf_read(to_ccwdev(dev), idx));
1087 static ssize_t cmb_show_avg_sample_interval(struct device *dev,
1088 struct device_attribute *attr,
1091 struct ccw_device *cdev;
1093 unsigned long count;
1094 struct cmb_data *cmb_data;
1096 cdev = to_ccwdev(dev);
1097 count = cmf_read(cdev, cmb_sample_count);
1098 spin_lock_irq(cdev->ccwlock);
1099 cmb_data = cdev->private->cmb;
1101 interval = cmb_data->last_update -
1102 cdev->private->cmb_start_time;
1103 interval = (interval * 1000) >> 12;
1107 spin_unlock_irq(cdev->ccwlock);
1108 return sprintf(buf, "%ld\n", interval);
1111 static ssize_t cmb_show_avg_utilization(struct device *dev,
1112 struct device_attribute *attr,
1115 struct cmbdata data;
1120 ret = cmf_readall(to_ccwdev(dev), &data);
1121 if (ret == -EAGAIN || ret == -ENODEV)
1122 /* No data (yet/currently) available to use for calculation. */
1123 return sprintf(buf, "n/a\n");
1127 utilization = data.device_connect_time +
1128 data.function_pending_time +
1129 data.device_disconnect_time;
1131 /* shift to avoid long long division */
1132 while (-1ul < (data.elapsed_time | utilization)) {
1134 data.elapsed_time >>= 8;
1137 /* calculate value in 0.1 percent units */
1138 t = (unsigned long) data.elapsed_time / 1000;
1139 u = (unsigned long) utilization / t;
1141 return sprintf(buf, "%02ld.%01ld%%\n", u/ 10, u - (u/ 10) * 10);
1144 #define cmf_attr(name) \
1145 static ssize_t show_##name(struct device *dev, \
1146 struct device_attribute *attr, char *buf) \
1147 { return cmb_show_attr((dev), buf, cmb_##name); } \
1148 static DEVICE_ATTR(name, 0444, show_##name, NULL);
1150 #define cmf_attr_avg(name) \
1151 static ssize_t show_avg_##name(struct device *dev, \
1152 struct device_attribute *attr, char *buf) \
1153 { return cmb_show_attr((dev), buf, cmb_##name); } \
1154 static DEVICE_ATTR(avg_##name, 0444, show_avg_##name, NULL);
1156 cmf_attr(ssch_rsch_count);
1157 cmf_attr(sample_count);
1158 cmf_attr_avg(device_connect_time);
1159 cmf_attr_avg(function_pending_time);
1160 cmf_attr_avg(device_disconnect_time);
1161 cmf_attr_avg(control_unit_queuing_time);
1162 cmf_attr_avg(device_active_only_time);
1163 cmf_attr_avg(device_busy_time);
1164 cmf_attr_avg(initial_command_response_time);
1166 static DEVICE_ATTR(avg_sample_interval, 0444, cmb_show_avg_sample_interval,
1168 static DEVICE_ATTR(avg_utilization, 0444, cmb_show_avg_utilization, NULL);
1170 static struct attribute *cmf_attributes[] = {
1171 &dev_attr_avg_sample_interval.attr,
1172 &dev_attr_avg_utilization.attr,
1173 &dev_attr_ssch_rsch_count.attr,
1174 &dev_attr_sample_count.attr,
1175 &dev_attr_avg_device_connect_time.attr,
1176 &dev_attr_avg_function_pending_time.attr,
1177 &dev_attr_avg_device_disconnect_time.attr,
1178 &dev_attr_avg_control_unit_queuing_time.attr,
1179 &dev_attr_avg_device_active_only_time.attr,
1183 static struct attribute_group cmf_attr_group = {
1185 .attrs = cmf_attributes,
1188 static struct attribute *cmf_attributes_ext[] = {
1189 &dev_attr_avg_sample_interval.attr,
1190 &dev_attr_avg_utilization.attr,
1191 &dev_attr_ssch_rsch_count.attr,
1192 &dev_attr_sample_count.attr,
1193 &dev_attr_avg_device_connect_time.attr,
1194 &dev_attr_avg_function_pending_time.attr,
1195 &dev_attr_avg_device_disconnect_time.attr,
1196 &dev_attr_avg_control_unit_queuing_time.attr,
1197 &dev_attr_avg_device_active_only_time.attr,
1198 &dev_attr_avg_device_busy_time.attr,
1199 &dev_attr_avg_initial_command_response_time.attr,
1203 static struct attribute_group cmf_attr_group_ext = {
1205 .attrs = cmf_attributes_ext,
1208 static ssize_t cmb_enable_show(struct device *dev,
1209 struct device_attribute *attr,
1212 return sprintf(buf, "%d\n", to_ccwdev(dev)->private->cmb ? 1 : 0);
1215 static ssize_t cmb_enable_store(struct device *dev,
1216 struct device_attribute *attr, const char *buf,
1219 struct ccw_device *cdev;
1223 ret = strict_strtoul(buf, 16, &val);
1227 cdev = to_ccwdev(dev);
1231 ret = disable_cmf(cdev);
1234 ret = enable_cmf(cdev);
1241 DEVICE_ATTR(cmb_enable, 0644, cmb_enable_show, cmb_enable_store);
1244 * enable_cmf() - switch on the channel measurement for a specific device
1245 * @cdev: The ccw device to be enabled
1247 * Returns %0 for success or a negative error value.
1252 int enable_cmf(struct ccw_device *cdev)
1256 ret = cmbops->alloc(cdev);
1257 cmbops->reset(cdev);
1260 ret = cmbops->set(cdev, 2);
1265 ret = sysfs_create_group(&cdev->dev.kobj, cmbops->attr_group);
1268 cmbops->set(cdev, 0); //FIXME: this can fail
1274 * disable_cmf() - switch off the channel measurement for a specific device
1275 * @cdev: The ccw device to be disabled
1277 * Returns %0 for success or a negative error value.
1282 int disable_cmf(struct ccw_device *cdev)
1286 ret = cmbops->set(cdev, 0);
1290 sysfs_remove_group(&cdev->dev.kobj, cmbops->attr_group);
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
1299 * Returns the value read or %0 if the value cannot be read.
1304 u64 cmf_read(struct ccw_device *cdev, int index)
1306 return cmbops->read(cdev, index);
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
1314 * Returns %0 on success, a negative error value otherwise.
1319 int cmf_readall(struct ccw_device *cdev, struct cmbdata *data)
1321 return cmbops->readall(cdev, data);
1324 /* Reenable cmf when a disconnected device becomes available again. */
1325 int cmf_reenable(struct ccw_device *cdev)
1327 cmbops->reset(cdev);
1328 return cmbops->set(cdev, 2);
1331 static int __init init_cmf(void)
1333 char *format_string;
1334 char *detect_string = "parameter";
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
1341 if (format == CMF_AUTODETECT) {
1342 if (!css_general_characteristics.ext_mb) {
1345 format = CMF_EXTENDED;
1347 detect_string = "autodetected";
1349 detect_string = "parameter";
1354 format_string = "basic";
1355 cmbops = &cmbops_basic;
1358 format_string = "extended";
1359 cmbops = &cmbops_extended;
1365 printk(KERN_INFO "cio: Channel measurement facility using %s "
1366 "format (%s)\n", format_string, detect_string);
1370 module_init(init_cmf);
1373 MODULE_AUTHOR("Arnd Bergmann <arndb@de.ibm.com>");
1374 MODULE_LICENSE("GPL");
1375 MODULE_DESCRIPTION("channel measurement facility base driver\n"
1376 "Copyright 2003 IBM Corporation\n");
1378 EXPORT_SYMBOL_GPL(enable_cmf);
1379 EXPORT_SYMBOL_GPL(disable_cmf);
1380 EXPORT_SYMBOL_GPL(cmf_read);
1381 EXPORT_SYMBOL_GPL(cmf_readall);