1 // SPDX-License-Identifier: GPL-2.0+
3 * Linux on zSeries Channel Measurement Facility support
5 * Copyright IBM Corp. 2000, 2006
7 * Authors: Arnd Bergmann <arndb@de.ibm.com>
8 * Cornelia Huck <cornelia.huck@de.ibm.com>
10 * original idea from Natarajan Krishnaswami <nkrishna@us.ibm.com>
13 #define KMSG_COMPONENT "cio"
14 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
16 #include <linux/memblock.h>
17 #include <linux/device.h>
18 #include <linux/init.h>
19 #include <linux/list.h>
20 #include <linux/export.h>
21 #include <linux/moduleparam.h>
22 #include <linux/slab.h>
23 #include <linux/timex.h> /* get_tod_clock() */
25 #include <asm/ccwdev.h>
28 #include <asm/div64.h>
37 * parameter to enable cmf during boot, possible uses are:
38 * "s390cmf" -- enable cmf and allocate 2 MB of ram so measuring can be
39 * used on any subchannel
40 * "s390cmf=<num>" -- enable cmf and allocate enough memory to measure
41 * <num> subchannel, where <num> is an integer
42 * between 1 and 65535, default is 1024
44 #define ARGSTRING "s390cmf"
46 /* indices for READCMB */
49 /* basic and exended format: */
50 cmb_ssch_rsch_count
= 0,
52 cmb_device_connect_time
,
53 cmb_function_pending_time
,
54 cmb_device_disconnect_time
,
55 cmb_control_unit_queuing_time
,
56 cmb_device_active_only_time
,
57 /* extended format only: */
59 cmb_initial_command_response_time
,
63 * enum cmb_format - types of supported measurement block formats
65 * @CMF_BASIC: traditional channel measurement blocks supported
66 * by all machines that we run on
67 * @CMF_EXTENDED: improved format that was introduced with the z990
69 * @CMF_AUTODETECT: default: use extended format when running on a machine
70 * supporting extended format, otherwise fall back to
80 * format - actual format for all measurement blocks
82 * The format module parameter can be set to a value of 0 (zero)
83 * or 1, indicating basic or extended format as described for
86 static int format
= CMF_AUTODETECT
;
87 module_param(format
, bint
, 0444);
90 * struct cmb_operations - functions to use depending on cmb_format
92 * Most of these functions operate on a struct ccw_device. There is only
93 * one instance of struct cmb_operations because the format of the measurement
94 * data is guaranteed to be the same for every ccw_device.
96 * @alloc: allocate memory for a channel measurement block,
97 * either with the help of a special pool or with kmalloc
98 * @free: free memory allocated with @alloc
99 * @set: enable or disable measurement
100 * @read: read a measurement entry at an index
101 * @readall: read a measurement block in a common format
102 * @reset: clear the data in the associated measurement block and
103 * reset its time stamp
105 struct cmb_operations
{
106 int (*alloc
) (struct ccw_device
*);
107 void (*free
) (struct ccw_device
*);
108 int (*set
) (struct ccw_device
*, u32
);
109 u64 (*read
) (struct ccw_device
*, int);
110 int (*readall
)(struct ccw_device
*, struct cmbdata
*);
111 void (*reset
) (struct ccw_device
*);
113 struct attribute_group
*attr_group
;
115 static struct cmb_operations
*cmbops
;
118 void *hw_block
; /* Pointer to block updated by hardware */
119 void *last_block
; /* Last changed block copied from hardware block */
120 int size
; /* Size of hw_block and last_block */
121 unsigned long long last_update
; /* when last_block was updated */
125 * Our user interface is designed in terms of nanoseconds,
126 * while the hardware measures total times in its own
129 static inline u64
time_to_nsec(u32 value
)
131 return ((u64
)value
) * 128000ull;
135 * Users are usually interested in average times,
136 * not accumulated time.
137 * This also helps us with atomicity problems
138 * when reading sinlge values.
140 static inline u64
time_to_avg_nsec(u32 value
, u32 count
)
144 /* no samples yet, avoid division by 0 */
148 /* value comes in units of 128 µsec */
149 ret
= time_to_nsec(value
);
159 * Activate or deactivate the channel monitor. When area is NULL,
160 * the monitor is deactivated. The channel monitor needs to
161 * be active in order to measure subchannels, which also need
164 static inline void cmf_activate(void *area
, unsigned int onoff
)
166 register void * __gpr2
asm("2");
167 register long __gpr1
asm("1");
171 /* activate channel measurement */
172 asm("schm" : : "d" (__gpr2
), "d" (__gpr1
) );
175 static int set_schib(struct ccw_device
*cdev
, u32 mme
, int mbfc
,
176 unsigned long address
)
178 struct subchannel
*sch
= to_subchannel(cdev
->dev
.parent
);
181 sch
->config
.mme
= mme
;
182 sch
->config
.mbfc
= mbfc
;
183 /* address can be either a block address or a block index */
185 sch
->config
.mba
= address
;
187 sch
->config
.mbi
= address
;
189 ret
= cio_commit_config(sch
);
190 if (!mme
&& ret
== -ENODEV
) {
192 * The task was to disable measurement block updates but
193 * the subchannel is already gone. Report success.
200 struct set_schib_struct
{
203 unsigned long address
;
204 wait_queue_head_t wait
;
208 #define CMF_PENDING 1
209 #define SET_SCHIB_TIMEOUT (10 * HZ)
211 static int set_schib_wait(struct ccw_device
*cdev
, u32 mme
,
212 int mbfc
, unsigned long address
)
214 struct set_schib_struct set_data
;
217 spin_lock_irq(cdev
->ccwlock
);
218 if (!cdev
->private->cmb
)
221 ret
= set_schib(cdev
, mme
, mbfc
, address
);
225 /* if the device is not online, don't even try again */
226 if (cdev
->private->state
!= DEV_STATE_ONLINE
)
229 init_waitqueue_head(&set_data
.wait
);
231 set_data
.mbfc
= mbfc
;
232 set_data
.address
= address
;
233 set_data
.ret
= CMF_PENDING
;
235 cdev
->private->state
= DEV_STATE_CMFCHANGE
;
236 cdev
->private->cmb_wait
= &set_data
;
237 spin_unlock_irq(cdev
->ccwlock
);
239 ret
= wait_event_interruptible_timeout(set_data
.wait
,
240 set_data
.ret
!= CMF_PENDING
,
242 spin_lock_irq(cdev
->ccwlock
);
244 if (set_data
.ret
== CMF_PENDING
) {
245 set_data
.ret
= (ret
== 0) ? -ETIME
: ret
;
246 if (cdev
->private->state
== DEV_STATE_CMFCHANGE
)
247 cdev
->private->state
= DEV_STATE_ONLINE
;
250 cdev
->private->cmb_wait
= NULL
;
253 spin_unlock_irq(cdev
->ccwlock
);
257 void retry_set_schib(struct ccw_device
*cdev
)
259 struct set_schib_struct
*set_data
= cdev
->private->cmb_wait
;
264 set_data
->ret
= set_schib(cdev
, set_data
->mme
, set_data
->mbfc
,
266 wake_up(&set_data
->wait
);
269 static int cmf_copy_block(struct ccw_device
*cdev
)
271 struct subchannel
*sch
= to_subchannel(cdev
->dev
.parent
);
272 struct cmb_data
*cmb_data
;
275 if (cio_update_schib(sch
))
278 if (scsw_fctl(&sch
->schib
.scsw
) & SCSW_FCTL_START_FUNC
) {
279 /* Don't copy if a start function is in progress. */
280 if ((!(scsw_actl(&sch
->schib
.scsw
) & SCSW_ACTL_SUSPENDED
)) &&
281 (scsw_actl(&sch
->schib
.scsw
) &
282 (SCSW_ACTL_DEVACT
| SCSW_ACTL_SCHACT
)) &&
283 (!(scsw_stctl(&sch
->schib
.scsw
) & SCSW_STCTL_SEC_STATUS
)))
286 cmb_data
= cdev
->private->cmb
;
287 hw_block
= cmb_data
->hw_block
;
288 memcpy(cmb_data
->last_block
, hw_block
, cmb_data
->size
);
289 cmb_data
->last_update
= get_tod_clock();
293 struct copy_block_struct
{
294 wait_queue_head_t wait
;
298 static int cmf_cmb_copy_wait(struct ccw_device
*cdev
)
300 struct copy_block_struct copy_block
;
303 spin_lock_irq(cdev
->ccwlock
);
304 if (!cdev
->private->cmb
)
307 ret
= cmf_copy_block(cdev
);
311 if (cdev
->private->state
!= DEV_STATE_ONLINE
)
314 init_waitqueue_head(©_block
.wait
);
315 copy_block
.ret
= CMF_PENDING
;
317 cdev
->private->state
= DEV_STATE_CMFUPDATE
;
318 cdev
->private->cmb_wait
= ©_block
;
319 spin_unlock_irq(cdev
->ccwlock
);
321 ret
= wait_event_interruptible(copy_block
.wait
,
322 copy_block
.ret
!= CMF_PENDING
);
323 spin_lock_irq(cdev
->ccwlock
);
325 if (copy_block
.ret
== CMF_PENDING
) {
326 copy_block
.ret
= -ERESTARTSYS
;
327 if (cdev
->private->state
== DEV_STATE_CMFUPDATE
)
328 cdev
->private->state
= DEV_STATE_ONLINE
;
331 cdev
->private->cmb_wait
= NULL
;
332 ret
= copy_block
.ret
;
334 spin_unlock_irq(cdev
->ccwlock
);
338 void cmf_retry_copy_block(struct ccw_device
*cdev
)
340 struct copy_block_struct
*copy_block
= cdev
->private->cmb_wait
;
345 copy_block
->ret
= cmf_copy_block(cdev
);
346 wake_up(©_block
->wait
);
349 static void cmf_generic_reset(struct ccw_device
*cdev
)
351 struct cmb_data
*cmb_data
;
353 spin_lock_irq(cdev
->ccwlock
);
354 cmb_data
= cdev
->private->cmb
;
356 memset(cmb_data
->last_block
, 0, cmb_data
->size
);
358 * Need to reset hw block as well to make the hardware start
361 memset(cmb_data
->hw_block
, 0, cmb_data
->size
);
362 cmb_data
->last_update
= 0;
364 cdev
->private->cmb_start_time
= get_tod_clock();
365 spin_unlock_irq(cdev
->ccwlock
);
369 * struct cmb_area - container for global cmb data
371 * @mem: pointer to CMBs (only in basic measurement mode)
372 * @list: contains a linked list of all subchannels
373 * @num_channels: number of channels to be measured
374 * @lock: protect concurrent access to @mem and @list
378 struct list_head list
;
383 static struct cmb_area cmb_area
= {
384 .lock
= __SPIN_LOCK_UNLOCKED(cmb_area
.lock
),
385 .list
= LIST_HEAD_INIT(cmb_area
.list
),
386 .num_channels
= 1024,
389 /* ****** old style CMB handling ********/
392 * Basic channel measurement blocks are allocated in one contiguous
393 * block of memory, which can not be moved as long as any channel
394 * is active. Therefore, a maximum number of subchannels needs to
395 * be defined somewhere. This is a module parameter, defaulting to
396 * a reasonable value of 1024, or 32 kb of memory.
397 * Current kernels don't allow kmalloc with more than 128kb, so the
401 module_param_named(maxchannels
, cmb_area
.num_channels
, uint
, 0444);
404 * struct cmb - basic channel measurement block
405 * @ssch_rsch_count: number of ssch and rsch
406 * @sample_count: number of samples
407 * @device_connect_time: time of device connect
408 * @function_pending_time: time of function pending
409 * @device_disconnect_time: time of device disconnect
410 * @control_unit_queuing_time: time of control unit queuing
411 * @device_active_only_time: time of device active only
412 * @reserved: unused in basic measurement mode
414 * The measurement block as used by the hardware. The fields are described
415 * further in z/Architecture Principles of Operation, chapter 17.
417 * The cmb area made up from these blocks must be a contiguous array and may
418 * not be reallocated or freed.
419 * Only one cmb area can be present in the system.
424 u32 device_connect_time
;
425 u32 function_pending_time
;
426 u32 device_disconnect_time
;
427 u32 control_unit_queuing_time
;
428 u32 device_active_only_time
;
433 * Insert a single device into the cmb_area list.
434 * Called with cmb_area.lock held from alloc_cmb.
436 static int alloc_cmb_single(struct ccw_device
*cdev
,
437 struct cmb_data
*cmb_data
)
440 struct ccw_device_private
*node
;
443 spin_lock_irq(cdev
->ccwlock
);
444 if (!list_empty(&cdev
->private->cmb_list
)) {
450 * Find first unused cmb in cmb_area.mem.
451 * This is a little tricky: cmb_area.list
452 * remains sorted by ->cmb->hw_data pointers.
455 list_for_each_entry(node
, &cmb_area
.list
, cmb_list
) {
456 struct cmb_data
*data
;
458 if ((struct cmb
*)data
->hw_block
> cmb
)
462 if (cmb
- cmb_area
.mem
>= cmb_area
.num_channels
) {
468 list_add_tail(&cdev
->private->cmb_list
, &node
->cmb_list
);
469 cmb_data
->hw_block
= cmb
;
470 cdev
->private->cmb
= cmb_data
;
473 spin_unlock_irq(cdev
->ccwlock
);
477 static int alloc_cmb(struct ccw_device
*cdev
)
482 struct cmb_data
*cmb_data
;
484 /* Allocate private cmb_data. */
485 cmb_data
= kzalloc(sizeof(struct cmb_data
), GFP_KERNEL
);
489 cmb_data
->last_block
= kzalloc(sizeof(struct cmb
), GFP_KERNEL
);
490 if (!cmb_data
->last_block
) {
494 cmb_data
->size
= sizeof(struct cmb
);
495 spin_lock(&cmb_area
.lock
);
498 /* there is no user yet, so we need a new area */
499 size
= sizeof(struct cmb
) * cmb_area
.num_channels
;
500 WARN_ON(!list_empty(&cmb_area
.list
));
502 spin_unlock(&cmb_area
.lock
);
503 mem
= (void*)__get_free_pages(GFP_KERNEL
| GFP_DMA
,
505 spin_lock(&cmb_area
.lock
);
508 /* ok, another thread was faster */
509 free_pages((unsigned long)mem
, get_order(size
));
516 memset(mem
, 0, size
);
518 cmf_activate(cmb_area
.mem
, CMF_ON
);
522 /* do the actual allocation */
523 ret
= alloc_cmb_single(cdev
, cmb_data
);
525 spin_unlock(&cmb_area
.lock
);
527 kfree(cmb_data
->last_block
);
533 static void free_cmb(struct ccw_device
*cdev
)
535 struct ccw_device_private
*priv
;
536 struct cmb_data
*cmb_data
;
538 spin_lock(&cmb_area
.lock
);
539 spin_lock_irq(cdev
->ccwlock
);
541 priv
= cdev
->private;
542 cmb_data
= priv
->cmb
;
545 kfree(cmb_data
->last_block
);
547 list_del_init(&priv
->cmb_list
);
549 if (list_empty(&cmb_area
.list
)) {
551 size
= sizeof(struct cmb
) * cmb_area
.num_channels
;
552 cmf_activate(NULL
, CMF_OFF
);
553 free_pages((unsigned long)cmb_area
.mem
, get_order(size
));
556 spin_unlock_irq(cdev
->ccwlock
);
557 spin_unlock(&cmb_area
.lock
);
560 static int set_cmb(struct ccw_device
*cdev
, u32 mme
)
563 struct cmb_data
*cmb_data
;
566 spin_lock_irqsave(cdev
->ccwlock
, flags
);
567 if (!cdev
->private->cmb
) {
568 spin_unlock_irqrestore(cdev
->ccwlock
, flags
);
571 cmb_data
= cdev
->private->cmb
;
572 offset
= mme
? (struct cmb
*)cmb_data
->hw_block
- cmb_area
.mem
: 0;
573 spin_unlock_irqrestore(cdev
->ccwlock
, flags
);
575 return set_schib_wait(cdev
, mme
, 0, offset
);
578 /* calculate utilization in 0.1 percent units */
579 static u64
__cmb_utilization(u64 device_connect_time
, u64 function_pending_time
,
580 u64 device_disconnect_time
, u64 start_time
)
582 u64 utilization
, elapsed_time
;
584 utilization
= time_to_nsec(device_connect_time
+
585 function_pending_time
+
586 device_disconnect_time
);
588 elapsed_time
= get_tod_clock() - start_time
;
589 elapsed_time
= tod_to_ns(elapsed_time
);
590 elapsed_time
/= 1000;
592 return elapsed_time
? (utilization
/ elapsed_time
) : 0;
595 static u64
read_cmb(struct ccw_device
*cdev
, int index
)
597 struct cmb_data
*cmb_data
;
603 spin_lock_irqsave(cdev
->ccwlock
, flags
);
604 cmb_data
= cdev
->private->cmb
;
608 cmb
= cmb_data
->hw_block
;
610 case avg_utilization
:
611 ret
= __cmb_utilization(cmb
->device_connect_time
,
612 cmb
->function_pending_time
,
613 cmb
->device_disconnect_time
,
614 cdev
->private->cmb_start_time
);
616 case cmb_ssch_rsch_count
:
617 ret
= cmb
->ssch_rsch_count
;
619 case cmb_sample_count
:
620 ret
= cmb
->sample_count
;
622 case cmb_device_connect_time
:
623 val
= cmb
->device_connect_time
;
625 case cmb_function_pending_time
:
626 val
= cmb
->function_pending_time
;
628 case cmb_device_disconnect_time
:
629 val
= cmb
->device_disconnect_time
;
631 case cmb_control_unit_queuing_time
:
632 val
= cmb
->control_unit_queuing_time
;
634 case cmb_device_active_only_time
:
635 val
= cmb
->device_active_only_time
;
640 ret
= time_to_avg_nsec(val
, cmb
->sample_count
);
642 spin_unlock_irqrestore(cdev
->ccwlock
, flags
);
646 static int readall_cmb(struct ccw_device
*cdev
, struct cmbdata
*data
)
649 struct cmb_data
*cmb_data
;
654 ret
= cmf_cmb_copy_wait(cdev
);
657 spin_lock_irqsave(cdev
->ccwlock
, flags
);
658 cmb_data
= cdev
->private->cmb
;
663 if (cmb_data
->last_update
== 0) {
667 cmb
= cmb_data
->last_block
;
668 time
= cmb_data
->last_update
- cdev
->private->cmb_start_time
;
670 memset(data
, 0, sizeof(struct cmbdata
));
672 /* we only know values before device_busy_time */
673 data
->size
= offsetof(struct cmbdata
, device_busy_time
);
675 data
->elapsed_time
= tod_to_ns(time
);
677 /* copy data to new structure */
678 data
->ssch_rsch_count
= cmb
->ssch_rsch_count
;
679 data
->sample_count
= cmb
->sample_count
;
681 /* time fields are converted to nanoseconds while copying */
682 data
->device_connect_time
= time_to_nsec(cmb
->device_connect_time
);
683 data
->function_pending_time
= time_to_nsec(cmb
->function_pending_time
);
684 data
->device_disconnect_time
=
685 time_to_nsec(cmb
->device_disconnect_time
);
686 data
->control_unit_queuing_time
687 = time_to_nsec(cmb
->control_unit_queuing_time
);
688 data
->device_active_only_time
689 = time_to_nsec(cmb
->device_active_only_time
);
692 spin_unlock_irqrestore(cdev
->ccwlock
, flags
);
696 static void reset_cmb(struct ccw_device
*cdev
)
698 cmf_generic_reset(cdev
);
701 static int cmf_enabled(struct ccw_device
*cdev
)
705 spin_lock_irq(cdev
->ccwlock
);
706 enabled
= !!cdev
->private->cmb
;
707 spin_unlock_irq(cdev
->ccwlock
);
712 static struct attribute_group cmf_attr_group
;
714 static struct cmb_operations cmbops_basic
= {
719 .readall
= readall_cmb
,
721 .attr_group
= &cmf_attr_group
,
724 /* ******** extended cmb handling ********/
727 * struct cmbe - extended channel measurement block
728 * @ssch_rsch_count: number of ssch and rsch
729 * @sample_count: number of samples
730 * @device_connect_time: time of device connect
731 * @function_pending_time: time of function pending
732 * @device_disconnect_time: time of device disconnect
733 * @control_unit_queuing_time: time of control unit queuing
734 * @device_active_only_time: time of device active only
735 * @device_busy_time: time of device busy
736 * @initial_command_response_time: initial command response time
739 * The measurement block as used by the hardware. May be in any 64 bit physical
741 * The fields are described further in z/Architecture Principles of Operation,
742 * third edition, chapter 17.
747 u32 device_connect_time
;
748 u32 function_pending_time
;
749 u32 device_disconnect_time
;
750 u32 control_unit_queuing_time
;
751 u32 device_active_only_time
;
752 u32 device_busy_time
;
753 u32 initial_command_response_time
;
755 } __packed
__aligned(64);
757 static struct kmem_cache
*cmbe_cache
;
759 static int alloc_cmbe(struct ccw_device
*cdev
)
761 struct cmb_data
*cmb_data
;
765 cmbe
= kmem_cache_zalloc(cmbe_cache
, GFP_KERNEL
);
769 cmb_data
= kzalloc(sizeof(*cmb_data
), GFP_KERNEL
);
773 cmb_data
->last_block
= kzalloc(sizeof(struct cmbe
), GFP_KERNEL
);
774 if (!cmb_data
->last_block
)
777 cmb_data
->size
= sizeof(*cmbe
);
778 cmb_data
->hw_block
= cmbe
;
780 spin_lock(&cmb_area
.lock
);
781 spin_lock_irq(cdev
->ccwlock
);
782 if (cdev
->private->cmb
)
785 cdev
->private->cmb
= cmb_data
;
787 /* activate global measurement if this is the first channel */
788 if (list_empty(&cmb_area
.list
))
789 cmf_activate(NULL
, CMF_ON
);
790 list_add_tail(&cdev
->private->cmb_list
, &cmb_area
.list
);
792 spin_unlock_irq(cdev
->ccwlock
);
793 spin_unlock(&cmb_area
.lock
);
797 spin_unlock_irq(cdev
->ccwlock
);
798 spin_unlock(&cmb_area
.lock
);
802 kfree(cmb_data
->last_block
);
804 kmem_cache_free(cmbe_cache
, cmbe
);
809 static void free_cmbe(struct ccw_device
*cdev
)
811 struct cmb_data
*cmb_data
;
813 spin_lock(&cmb_area
.lock
);
814 spin_lock_irq(cdev
->ccwlock
);
815 cmb_data
= cdev
->private->cmb
;
816 cdev
->private->cmb
= NULL
;
818 kfree(cmb_data
->last_block
);
819 kmem_cache_free(cmbe_cache
, cmb_data
->hw_block
);
823 /* deactivate global measurement if this is the last channel */
824 list_del_init(&cdev
->private->cmb_list
);
825 if (list_empty(&cmb_area
.list
))
826 cmf_activate(NULL
, CMF_OFF
);
827 spin_unlock_irq(cdev
->ccwlock
);
828 spin_unlock(&cmb_area
.lock
);
831 static int set_cmbe(struct ccw_device
*cdev
, u32 mme
)
834 struct cmb_data
*cmb_data
;
837 spin_lock_irqsave(cdev
->ccwlock
, flags
);
838 if (!cdev
->private->cmb
) {
839 spin_unlock_irqrestore(cdev
->ccwlock
, flags
);
842 cmb_data
= cdev
->private->cmb
;
843 mba
= mme
? (unsigned long) cmb_data
->hw_block
: 0;
844 spin_unlock_irqrestore(cdev
->ccwlock
, flags
);
846 return set_schib_wait(cdev
, mme
, 1, mba
);
849 static u64
read_cmbe(struct ccw_device
*cdev
, int index
)
851 struct cmb_data
*cmb_data
;
857 spin_lock_irqsave(cdev
->ccwlock
, flags
);
858 cmb_data
= cdev
->private->cmb
;
862 cmb
= cmb_data
->hw_block
;
864 case avg_utilization
:
865 ret
= __cmb_utilization(cmb
->device_connect_time
,
866 cmb
->function_pending_time
,
867 cmb
->device_disconnect_time
,
868 cdev
->private->cmb_start_time
);
870 case cmb_ssch_rsch_count
:
871 ret
= cmb
->ssch_rsch_count
;
873 case cmb_sample_count
:
874 ret
= cmb
->sample_count
;
876 case cmb_device_connect_time
:
877 val
= cmb
->device_connect_time
;
879 case cmb_function_pending_time
:
880 val
= cmb
->function_pending_time
;
882 case cmb_device_disconnect_time
:
883 val
= cmb
->device_disconnect_time
;
885 case cmb_control_unit_queuing_time
:
886 val
= cmb
->control_unit_queuing_time
;
888 case cmb_device_active_only_time
:
889 val
= cmb
->device_active_only_time
;
891 case cmb_device_busy_time
:
892 val
= cmb
->device_busy_time
;
894 case cmb_initial_command_response_time
:
895 val
= cmb
->initial_command_response_time
;
900 ret
= time_to_avg_nsec(val
, cmb
->sample_count
);
902 spin_unlock_irqrestore(cdev
->ccwlock
, flags
);
906 static int readall_cmbe(struct ccw_device
*cdev
, struct cmbdata
*data
)
909 struct cmb_data
*cmb_data
;
914 ret
= cmf_cmb_copy_wait(cdev
);
917 spin_lock_irqsave(cdev
->ccwlock
, flags
);
918 cmb_data
= cdev
->private->cmb
;
923 if (cmb_data
->last_update
== 0) {
927 time
= cmb_data
->last_update
- cdev
->private->cmb_start_time
;
929 memset (data
, 0, sizeof(struct cmbdata
));
931 /* we only know values before device_busy_time */
932 data
->size
= offsetof(struct cmbdata
, device_busy_time
);
934 data
->elapsed_time
= tod_to_ns(time
);
936 cmb
= cmb_data
->last_block
;
937 /* copy data to new structure */
938 data
->ssch_rsch_count
= cmb
->ssch_rsch_count
;
939 data
->sample_count
= cmb
->sample_count
;
941 /* time fields are converted to nanoseconds while copying */
942 data
->device_connect_time
= time_to_nsec(cmb
->device_connect_time
);
943 data
->function_pending_time
= time_to_nsec(cmb
->function_pending_time
);
944 data
->device_disconnect_time
=
945 time_to_nsec(cmb
->device_disconnect_time
);
946 data
->control_unit_queuing_time
947 = time_to_nsec(cmb
->control_unit_queuing_time
);
948 data
->device_active_only_time
949 = time_to_nsec(cmb
->device_active_only_time
);
950 data
->device_busy_time
= time_to_nsec(cmb
->device_busy_time
);
951 data
->initial_command_response_time
952 = time_to_nsec(cmb
->initial_command_response_time
);
956 spin_unlock_irqrestore(cdev
->ccwlock
, flags
);
960 static void reset_cmbe(struct ccw_device
*cdev
)
962 cmf_generic_reset(cdev
);
965 static struct attribute_group cmf_attr_group_ext
;
967 static struct cmb_operations cmbops_extended
= {
972 .readall
= readall_cmbe
,
974 .attr_group
= &cmf_attr_group_ext
,
977 static ssize_t
cmb_show_attr(struct device
*dev
, char *buf
, enum cmb_index idx
)
979 return sprintf(buf
, "%lld\n",
980 (unsigned long long) cmf_read(to_ccwdev(dev
), idx
));
983 static ssize_t
cmb_show_avg_sample_interval(struct device
*dev
,
984 struct device_attribute
*attr
,
987 struct ccw_device
*cdev
= to_ccwdev(dev
);
991 count
= cmf_read(cdev
, cmb_sample_count
);
992 spin_lock_irq(cdev
->ccwlock
);
994 interval
= get_tod_clock() - cdev
->private->cmb_start_time
;
995 interval
= tod_to_ns(interval
);
999 spin_unlock_irq(cdev
->ccwlock
);
1000 return sprintf(buf
, "%ld\n", interval
);
1003 static ssize_t
cmb_show_avg_utilization(struct device
*dev
,
1004 struct device_attribute
*attr
,
1007 unsigned long u
= cmf_read(to_ccwdev(dev
), avg_utilization
);
1009 return sprintf(buf
, "%02lu.%01lu%%\n", u
/ 10, u
% 10);
1012 #define cmf_attr(name) \
1013 static ssize_t show_##name(struct device *dev, \
1014 struct device_attribute *attr, char *buf) \
1015 { return cmb_show_attr((dev), buf, cmb_##name); } \
1016 static DEVICE_ATTR(name, 0444, show_##name, NULL);
1018 #define cmf_attr_avg(name) \
1019 static ssize_t show_avg_##name(struct device *dev, \
1020 struct device_attribute *attr, char *buf) \
1021 { return cmb_show_attr((dev), buf, cmb_##name); } \
1022 static DEVICE_ATTR(avg_##name, 0444, show_avg_##name, NULL);
1024 cmf_attr(ssch_rsch_count
);
1025 cmf_attr(sample_count
);
1026 cmf_attr_avg(device_connect_time
);
1027 cmf_attr_avg(function_pending_time
);
1028 cmf_attr_avg(device_disconnect_time
);
1029 cmf_attr_avg(control_unit_queuing_time
);
1030 cmf_attr_avg(device_active_only_time
);
1031 cmf_attr_avg(device_busy_time
);
1032 cmf_attr_avg(initial_command_response_time
);
1034 static DEVICE_ATTR(avg_sample_interval
, 0444, cmb_show_avg_sample_interval
,
1036 static DEVICE_ATTR(avg_utilization
, 0444, cmb_show_avg_utilization
, NULL
);
1038 static struct attribute
*cmf_attributes
[] = {
1039 &dev_attr_avg_sample_interval
.attr
,
1040 &dev_attr_avg_utilization
.attr
,
1041 &dev_attr_ssch_rsch_count
.attr
,
1042 &dev_attr_sample_count
.attr
,
1043 &dev_attr_avg_device_connect_time
.attr
,
1044 &dev_attr_avg_function_pending_time
.attr
,
1045 &dev_attr_avg_device_disconnect_time
.attr
,
1046 &dev_attr_avg_control_unit_queuing_time
.attr
,
1047 &dev_attr_avg_device_active_only_time
.attr
,
1051 static struct attribute_group cmf_attr_group
= {
1053 .attrs
= cmf_attributes
,
1056 static struct attribute
*cmf_attributes_ext
[] = {
1057 &dev_attr_avg_sample_interval
.attr
,
1058 &dev_attr_avg_utilization
.attr
,
1059 &dev_attr_ssch_rsch_count
.attr
,
1060 &dev_attr_sample_count
.attr
,
1061 &dev_attr_avg_device_connect_time
.attr
,
1062 &dev_attr_avg_function_pending_time
.attr
,
1063 &dev_attr_avg_device_disconnect_time
.attr
,
1064 &dev_attr_avg_control_unit_queuing_time
.attr
,
1065 &dev_attr_avg_device_active_only_time
.attr
,
1066 &dev_attr_avg_device_busy_time
.attr
,
1067 &dev_attr_avg_initial_command_response_time
.attr
,
1071 static struct attribute_group cmf_attr_group_ext
= {
1073 .attrs
= cmf_attributes_ext
,
1076 static ssize_t
cmb_enable_show(struct device
*dev
,
1077 struct device_attribute
*attr
,
1080 struct ccw_device
*cdev
= to_ccwdev(dev
);
1082 return sprintf(buf
, "%d\n", cmf_enabled(cdev
));
1085 static ssize_t
cmb_enable_store(struct device
*dev
,
1086 struct device_attribute
*attr
, const char *buf
,
1089 struct ccw_device
*cdev
= to_ccwdev(dev
);
1093 ret
= kstrtoul(buf
, 16, &val
);
1099 ret
= disable_cmf(cdev
);
1102 ret
= enable_cmf(cdev
);
1108 return ret
? ret
: c
;
1110 DEVICE_ATTR_RW(cmb_enable
);
1113 * enable_cmf() - switch on the channel measurement for a specific device
1114 * @cdev: The ccw device to be enabled
1116 * Enable channel measurements for @cdev. If this is called on a device
1117 * for which channel measurement is already enabled a reset of the
1118 * measurement data is triggered.
1119 * Returns: %0 for success or a negative error value.
1123 int enable_cmf(struct ccw_device
*cdev
)
1127 device_lock(&cdev
->dev
);
1128 if (cmf_enabled(cdev
)) {
1129 cmbops
->reset(cdev
);
1132 get_device(&cdev
->dev
);
1133 ret
= cmbops
->alloc(cdev
);
1136 cmbops
->reset(cdev
);
1137 ret
= sysfs_create_group(&cdev
->dev
.kobj
, cmbops
->attr_group
);
1142 ret
= cmbops
->set(cdev
, 2);
1144 sysfs_remove_group(&cdev
->dev
.kobj
, cmbops
->attr_group
);
1149 put_device(&cdev
->dev
);
1151 device_unlock(&cdev
->dev
);
1156 * __disable_cmf() - switch off the channel measurement for a specific device
1157 * @cdev: The ccw device to be disabled
1159 * Returns: %0 for success or a negative error value.
1162 * non-atomic, device_lock() held.
1164 int __disable_cmf(struct ccw_device
*cdev
)
1168 ret
= cmbops
->set(cdev
, 0);
1172 sysfs_remove_group(&cdev
->dev
.kobj
, cmbops
->attr_group
);
1174 put_device(&cdev
->dev
);
1180 * disable_cmf() - switch off the channel measurement for a specific device
1181 * @cdev: The ccw device to be disabled
1183 * Returns: %0 for success or a negative error value.
1188 int disable_cmf(struct ccw_device
*cdev
)
1192 device_lock(&cdev
->dev
);
1193 ret
= __disable_cmf(cdev
);
1194 device_unlock(&cdev
->dev
);
1200 * cmf_read() - read one value from the current channel measurement block
1201 * @cdev: the channel to be read
1202 * @index: the index of the value to be read
1204 * Returns: The value read or %0 if the value cannot be read.
1209 u64
cmf_read(struct ccw_device
*cdev
, int index
)
1211 return cmbops
->read(cdev
, index
);
1215 * cmf_readall() - read the current channel measurement block
1216 * @cdev: the channel to be read
1217 * @data: a pointer to a data block that will be filled
1219 * Returns: %0 on success, a negative error value otherwise.
1224 int cmf_readall(struct ccw_device
*cdev
, struct cmbdata
*data
)
1226 return cmbops
->readall(cdev
, data
);
1229 /* Reenable cmf when a disconnected device becomes available again. */
1230 int cmf_reenable(struct ccw_device
*cdev
)
1232 cmbops
->reset(cdev
);
1233 return cmbops
->set(cdev
, 2);
1237 * cmf_reactivate() - reactivate measurement block updates
1239 * Use this during resume from hibernate.
1241 void cmf_reactivate(void)
1243 spin_lock(&cmb_area
.lock
);
1244 if (!list_empty(&cmb_area
.list
))
1245 cmf_activate(cmb_area
.mem
, CMF_ON
);
1246 spin_unlock(&cmb_area
.lock
);
1249 static int __init
init_cmbe(void)
1251 cmbe_cache
= kmem_cache_create("cmbe_cache", sizeof(struct cmbe
),
1252 __alignof__(struct cmbe
), 0, NULL
);
1254 return cmbe_cache
? 0 : -ENOMEM
;
1257 static int __init
init_cmf(void)
1259 char *format_string
;
1260 char *detect_string
;
1264 * If the user did not give a parameter, see if we are running on a
1265 * machine supporting extended measurement blocks, otherwise fall back
1268 if (format
== CMF_AUTODETECT
) {
1269 if (!css_general_characteristics
.ext_mb
) {
1272 format
= CMF_EXTENDED
;
1274 detect_string
= "autodetected";
1276 detect_string
= "parameter";
1281 format_string
= "basic";
1282 cmbops
= &cmbops_basic
;
1285 format_string
= "extended";
1286 cmbops
= &cmbops_extended
;
1295 pr_info("Channel measurement facility initialized using format "
1296 "%s (mode %s)\n", format_string
, detect_string
);
1299 device_initcall(init_cmf
);
1301 EXPORT_SYMBOL_GPL(enable_cmf
);
1302 EXPORT_SYMBOL_GPL(disable_cmf
);
1303 EXPORT_SYMBOL_GPL(cmf_read
);
1304 EXPORT_SYMBOL_GPL(cmf_readall
);