2 * SGI UltraViolet TLB flush routines.
4 * (c) 2008-2014 Cliff Wickman <cpw@sgi.com>, SGI.
6 * This code is released under the GNU General Public License version 2 or
9 #include <linux/seq_file.h>
10 #include <linux/proc_fs.h>
11 #include <linux/debugfs.h>
12 #include <linux/kernel.h>
13 #include <linux/slab.h>
14 #include <linux/delay.h>
16 #include <asm/mmu_context.h>
17 #include <asm/uv/uv.h>
18 #include <asm/uv/uv_mmrs.h>
19 #include <asm/uv/uv_hub.h>
20 #include <asm/uv/uv_bau.h>
24 #include <asm/irq_vectors.h>
25 #include <asm/timer.h>
27 /* timeouts in nanoseconds (indexed by UVH_AGING_PRESCALE_SEL urgency7 30:28) */
28 static int timeout_base_ns
[] = {
39 static int timeout_us
;
40 static bool nobau
= true;
41 static int nobau_perm
;
42 static cycles_t congested_cycles
;
45 static int max_concurr
= MAX_BAU_CONCURRENT
;
46 static int max_concurr_const
= MAX_BAU_CONCURRENT
;
47 static int plugged_delay
= PLUGGED_DELAY
;
48 static int plugsb4reset
= PLUGSB4RESET
;
49 static int giveup_limit
= GIVEUP_LIMIT
;
50 static int timeoutsb4reset
= TIMEOUTSB4RESET
;
51 static int ipi_reset_limit
= IPI_RESET_LIMIT
;
52 static int complete_threshold
= COMPLETE_THRESHOLD
;
53 static int congested_respns_us
= CONGESTED_RESPONSE_US
;
54 static int congested_reps
= CONGESTED_REPS
;
55 static int disabled_period
= DISABLED_PERIOD
;
57 static struct tunables tunables
[] = {
58 {&max_concurr
, MAX_BAU_CONCURRENT
}, /* must be [0] */
59 {&plugged_delay
, PLUGGED_DELAY
},
60 {&plugsb4reset
, PLUGSB4RESET
},
61 {&timeoutsb4reset
, TIMEOUTSB4RESET
},
62 {&ipi_reset_limit
, IPI_RESET_LIMIT
},
63 {&complete_threshold
, COMPLETE_THRESHOLD
},
64 {&congested_respns_us
, CONGESTED_RESPONSE_US
},
65 {&congested_reps
, CONGESTED_REPS
},
66 {&disabled_period
, DISABLED_PERIOD
},
67 {&giveup_limit
, GIVEUP_LIMIT
}
70 static struct dentry
*tunables_dir
;
71 static struct dentry
*tunables_file
;
73 /* these correspond to the statistics printed by ptc_seq_show() */
74 static char *stat_description
[] = {
75 "sent: number of shootdown messages sent",
76 "stime: time spent sending messages",
77 "numuvhubs: number of hubs targeted with shootdown",
78 "numuvhubs16: number times 16 or more hubs targeted",
79 "numuvhubs8: number times 8 or more hubs targeted",
80 "numuvhubs4: number times 4 or more hubs targeted",
81 "numuvhubs2: number times 2 or more hubs targeted",
82 "numuvhubs1: number times 1 hub targeted",
83 "numcpus: number of cpus targeted with shootdown",
84 "dto: number of destination timeouts",
85 "retries: destination timeout retries sent",
86 "rok: : destination timeouts successfully retried",
87 "resetp: ipi-style resource resets for plugs",
88 "resett: ipi-style resource resets for timeouts",
89 "giveup: fall-backs to ipi-style shootdowns",
90 "sto: number of source timeouts",
91 "bz: number of stay-busy's",
92 "throt: number times spun in throttle",
93 "swack: image of UVH_LB_BAU_INTD_SOFTWARE_ACKNOWLEDGE",
94 "recv: shootdown messages received",
95 "rtime: time spent processing messages",
96 "all: shootdown all-tlb messages",
97 "one: shootdown one-tlb messages",
98 "mult: interrupts that found multiple messages",
99 "none: interrupts that found no messages",
100 "retry: number of retry messages processed",
101 "canc: number messages canceled by retries",
102 "nocan: number retries that found nothing to cancel",
103 "reset: number of ipi-style reset requests processed",
104 "rcan: number messages canceled by reset requests",
105 "disable: number times use of the BAU was disabled",
106 "enable: number times use of the BAU was re-enabled"
109 static int __init
setup_bau(char *arg
)
116 result
= strtobool(arg
, &nobau
);
120 /* we need to flip the logic here, so that bau=y sets nobau to false */
124 pr_info("UV BAU Enabled\n");
126 pr_info("UV BAU Disabled\n");
130 early_param("bau", setup_bau
);
132 /* base pnode in this partition */
133 static int uv_base_pnode __read_mostly
;
135 static DEFINE_PER_CPU(struct ptc_stats
, ptcstats
);
136 static DEFINE_PER_CPU(struct bau_control
, bau_control
);
137 static DEFINE_PER_CPU(cpumask_var_t
, uv_flush_tlb_mask
);
143 struct bau_control
*bcp
;
146 pr_info("BAU not initialized; cannot be turned on\n");
150 for_each_present_cpu(cpu
) {
151 bcp
= &per_cpu(bau_control
, cpu
);
154 pr_info("BAU turned on\n");
162 struct bau_control
*bcp
;
165 for_each_present_cpu(cpu
) {
166 bcp
= &per_cpu(bau_control
, cpu
);
169 pr_info("BAU turned off\n");
174 * Determine the first node on a uvhub. 'Nodes' are used for kernel
177 static int __init
uvhub_to_first_node(int uvhub
)
181 for_each_online_node(node
) {
182 b
= uv_node_to_blade_id(node
);
190 * Determine the apicid of the first cpu on a uvhub.
192 static int __init
uvhub_to_first_apicid(int uvhub
)
196 for_each_present_cpu(cpu
)
197 if (uvhub
== uv_cpu_to_blade_id(cpu
))
198 return per_cpu(x86_cpu_to_apicid
, cpu
);
203 * Free a software acknowledge hardware resource by clearing its Pending
204 * bit. This will return a reply to the sender.
205 * If the message has timed out, a reply has already been sent by the
206 * hardware but the resource has not been released. In that case our
207 * clear of the Timeout bit (as well) will free the resource. No reply will
208 * be sent (the hardware will only do one reply per message).
210 static void reply_to_message(struct msg_desc
*mdp
, struct bau_control
*bcp
,
214 struct bau_pq_entry
*msg
;
217 if (!msg
->canceled
&& do_acknowledge
) {
218 dw
= (msg
->swack_vec
<< UV_SW_ACK_NPENDING
) | msg
->swack_vec
;
219 write_mmr_sw_ack(dw
);
226 * Process the receipt of a RETRY message
228 static void bau_process_retry_msg(struct msg_desc
*mdp
,
229 struct bau_control
*bcp
)
232 int cancel_count
= 0;
233 unsigned long msg_res
;
234 unsigned long mmr
= 0;
235 struct bau_pq_entry
*msg
= mdp
->msg
;
236 struct bau_pq_entry
*msg2
;
237 struct ptc_stats
*stat
= bcp
->statp
;
241 * cancel any message from msg+1 to the retry itself
243 for (msg2
= msg
+1, i
= 0; i
< DEST_Q_SIZE
; msg2
++, i
++) {
244 if (msg2
> mdp
->queue_last
)
245 msg2
= mdp
->queue_first
;
249 /* same conditions for cancellation as do_reset */
250 if ((msg2
->replied_to
== 0) && (msg2
->canceled
== 0) &&
251 (msg2
->swack_vec
) && ((msg2
->swack_vec
&
252 msg
->swack_vec
) == 0) &&
253 (msg2
->sending_cpu
== msg
->sending_cpu
) &&
254 (msg2
->msg_type
!= MSG_NOOP
)) {
255 mmr
= read_mmr_sw_ack();
256 msg_res
= msg2
->swack_vec
;
258 * This is a message retry; clear the resources held
259 * by the previous message only if they timed out.
260 * If it has not timed out we have an unexpected
261 * situation to report.
263 if (mmr
& (msg_res
<< UV_SW_ACK_NPENDING
)) {
266 * Is the resource timed out?
267 * Make everyone ignore the cancelled message.
272 mr
= (msg_res
<< UV_SW_ACK_NPENDING
) | msg_res
;
273 write_mmr_sw_ack(mr
);
278 stat
->d_nocanceled
++;
282 * Do all the things a cpu should do for a TLB shootdown message.
283 * Other cpu's may come here at the same time for this message.
285 static void bau_process_message(struct msg_desc
*mdp
, struct bau_control
*bcp
,
288 short socket_ack_count
= 0;
290 struct atomic_short
*asp
;
291 struct ptc_stats
*stat
= bcp
->statp
;
292 struct bau_pq_entry
*msg
= mdp
->msg
;
293 struct bau_control
*smaster
= bcp
->socket_master
;
296 * This must be a normal message, or retry of a normal message
298 if (msg
->address
== TLB_FLUSH_ALL
) {
302 __flush_tlb_one(msg
->address
);
308 * One cpu on each uvhub has the additional job on a RETRY
309 * of releasing the resource held by the message that is
310 * being retried. That message is identified by sending
313 if (msg
->msg_type
== MSG_RETRY
&& bcp
== bcp
->uvhub_master
)
314 bau_process_retry_msg(mdp
, bcp
);
317 * This is a swack message, so we have to reply to it.
318 * Count each responding cpu on the socket. This avoids
319 * pinging the count's cache line back and forth between
322 sp
= &smaster
->socket_acknowledge_count
[mdp
->msg_slot
];
323 asp
= (struct atomic_short
*)sp
;
324 socket_ack_count
= atom_asr(1, asp
);
325 if (socket_ack_count
== bcp
->cpus_in_socket
) {
328 * Both sockets dump their completed count total into
329 * the message's count.
332 asp
= (struct atomic_short
*)&msg
->acknowledge_count
;
333 msg_ack_count
= atom_asr(socket_ack_count
, asp
);
335 if (msg_ack_count
== bcp
->cpus_in_uvhub
) {
337 * All cpus in uvhub saw it; reply
338 * (unless we are in the UV2 workaround)
340 reply_to_message(mdp
, bcp
, do_acknowledge
);
348 * Determine the first cpu on a pnode.
350 static int pnode_to_first_cpu(int pnode
, struct bau_control
*smaster
)
353 struct hub_and_pnode
*hpp
;
355 for_each_present_cpu(cpu
) {
356 hpp
= &smaster
->thp
[cpu
];
357 if (pnode
== hpp
->pnode
)
364 * Last resort when we get a large number of destination timeouts is
365 * to clear resources held by a given cpu.
366 * Do this with IPI so that all messages in the BAU message queue
367 * can be identified by their nonzero swack_vec field.
369 * This is entered for a single cpu on the uvhub.
370 * The sender want's this uvhub to free a specific message's
373 static void do_reset(void *ptr
)
376 struct bau_control
*bcp
= &per_cpu(bau_control
, smp_processor_id());
377 struct reset_args
*rap
= (struct reset_args
*)ptr
;
378 struct bau_pq_entry
*msg
;
379 struct ptc_stats
*stat
= bcp
->statp
;
383 * We're looking for the given sender, and
384 * will free its swack resource.
385 * If all cpu's finally responded after the timeout, its
386 * message 'replied_to' was set.
388 for (msg
= bcp
->queue_first
, i
= 0; i
< DEST_Q_SIZE
; msg
++, i
++) {
389 unsigned long msg_res
;
390 /* do_reset: same conditions for cancellation as
391 bau_process_retry_msg() */
392 if ((msg
->replied_to
== 0) &&
393 (msg
->canceled
== 0) &&
394 (msg
->sending_cpu
== rap
->sender
) &&
396 (msg
->msg_type
!= MSG_NOOP
)) {
400 * make everyone else ignore this message
404 * only reset the resource if it is still pending
406 mmr
= read_mmr_sw_ack();
407 msg_res
= msg
->swack_vec
;
408 mr
= (msg_res
<< UV_SW_ACK_NPENDING
) | msg_res
;
411 write_mmr_sw_ack(mr
);
419 * Use IPI to get all target uvhubs to release resources held by
420 * a given sending cpu number.
422 static void reset_with_ipi(struct pnmask
*distribution
, struct bau_control
*bcp
)
427 int sender
= bcp
->cpu
;
428 cpumask_t
*mask
= bcp
->uvhub_master
->cpumask
;
429 struct bau_control
*smaster
= bcp
->socket_master
;
430 struct reset_args reset_args
;
432 reset_args
.sender
= sender
;
434 /* find a single cpu for each uvhub in this distribution mask */
435 maskbits
= sizeof(struct pnmask
) * BITSPERBYTE
;
436 /* each bit is a pnode relative to the partition base pnode */
437 for (pnode
= 0; pnode
< maskbits
; pnode
++) {
439 if (!bau_uvhub_isset(pnode
, distribution
))
441 apnode
= pnode
+ bcp
->partition_base_pnode
;
442 cpu
= pnode_to_first_cpu(apnode
, smaster
);
443 cpumask_set_cpu(cpu
, mask
);
446 /* IPI all cpus; preemption is already disabled */
447 smp_call_function_many(mask
, do_reset
, (void *)&reset_args
, 1);
452 * Not to be confused with cycles_2_ns() from tsc.c; this gives a relative
453 * number, not an absolute. It converts a duration in cycles to a duration in
456 static inline unsigned long long cycles_2_ns(unsigned long long cyc
)
458 struct cyc2ns_data
*data
= cyc2ns_read_begin();
459 unsigned long long ns
;
461 ns
= mul_u64_u32_shr(cyc
, data
->cyc2ns_mul
, data
->cyc2ns_shift
);
463 cyc2ns_read_end(data
);
468 * The reverse of the above; converts a duration in ns to a duration in cycles.
470 static inline unsigned long long ns_2_cycles(unsigned long long ns
)
472 struct cyc2ns_data
*data
= cyc2ns_read_begin();
473 unsigned long long cyc
;
475 cyc
= (ns
<< data
->cyc2ns_shift
) / data
->cyc2ns_mul
;
477 cyc2ns_read_end(data
);
481 static inline unsigned long cycles_2_us(unsigned long long cyc
)
483 return cycles_2_ns(cyc
) / NSEC_PER_USEC
;
486 static inline cycles_t
sec_2_cycles(unsigned long sec
)
488 return ns_2_cycles(sec
* NSEC_PER_SEC
);
491 static inline unsigned long long usec_2_cycles(unsigned long usec
)
493 return ns_2_cycles(usec
* NSEC_PER_USEC
);
497 * wait for all cpus on this hub to finish their sends and go quiet
498 * leaves uvhub_quiesce set so that no new broadcasts are started by
499 * bau_flush_send_and_wait()
501 static inline void quiesce_local_uvhub(struct bau_control
*hmaster
)
503 atom_asr(1, (struct atomic_short
*)&hmaster
->uvhub_quiesce
);
507 * mark this quiet-requestor as done
509 static inline void end_uvhub_quiesce(struct bau_control
*hmaster
)
511 atom_asr(-1, (struct atomic_short
*)&hmaster
->uvhub_quiesce
);
514 static unsigned long uv1_read_status(unsigned long mmr_offset
, int right_shift
)
516 unsigned long descriptor_status
;
518 descriptor_status
= uv_read_local_mmr(mmr_offset
);
519 descriptor_status
>>= right_shift
;
520 descriptor_status
&= UV_ACT_STATUS_MASK
;
521 return descriptor_status
;
525 * Wait for completion of a broadcast software ack message
526 * return COMPLETE, RETRY(PLUGGED or TIMEOUT) or GIVEUP
528 static int uv1_wait_completion(struct bau_desc
*bau_desc
,
529 unsigned long mmr_offset
, int right_shift
,
530 struct bau_control
*bcp
, long try)
532 unsigned long descriptor_status
;
534 struct ptc_stats
*stat
= bcp
->statp
;
536 descriptor_status
= uv1_read_status(mmr_offset
, right_shift
);
537 /* spin on the status MMR, waiting for it to go idle */
538 while ((descriptor_status
!= DS_IDLE
)) {
540 * Our software ack messages may be blocked because
541 * there are no swack resources available. As long
542 * as none of them has timed out hardware will NACK
543 * our message and its state will stay IDLE.
545 if (descriptor_status
== DS_SOURCE_TIMEOUT
) {
548 } else if (descriptor_status
== DS_DESTINATION_TIMEOUT
) {
553 * Our retries may be blocked by all destination
554 * swack resources being consumed, and a timeout
555 * pending. In that case hardware returns the
556 * ERROR that looks like a destination timeout.
558 if (cycles_2_us(ttm
- bcp
->send_message
) < timeout_us
) {
559 bcp
->conseccompletes
= 0;
560 return FLUSH_RETRY_PLUGGED
;
563 bcp
->conseccompletes
= 0;
564 return FLUSH_RETRY_TIMEOUT
;
567 * descriptor_status is still BUSY
571 descriptor_status
= uv1_read_status(mmr_offset
, right_shift
);
573 bcp
->conseccompletes
++;
574 return FLUSH_COMPLETE
;
578 * UV2 could have an extra bit of status in the ACTIVATION_STATUS_2 register.
579 * But not currently used.
581 static unsigned long uv2_3_read_status(unsigned long offset
, int rshft
, int desc
)
583 unsigned long descriptor_status
;
586 ((read_lmmr(offset
) >> rshft
) & UV_ACT_STATUS_MASK
) << 1;
587 return descriptor_status
;
591 * Return whether the status of the descriptor that is normally used for this
592 * cpu (the one indexed by its hub-relative cpu number) is busy.
593 * The status of the original 32 descriptors is always reflected in the 64
594 * bits of UVH_LB_BAU_SB_ACTIVATION_STATUS_0.
595 * The bit provided by the activation_status_2 register is irrelevant to
596 * the status if it is only being tested for busy or not busy.
598 int normal_busy(struct bau_control
*bcp
)
600 int cpu
= bcp
->uvhub_cpu
;
604 mmr_offset
= UVH_LB_BAU_SB_ACTIVATION_STATUS_0
;
605 right_shift
= cpu
* UV_ACT_STATUS_SIZE
;
606 return (((((read_lmmr(mmr_offset
) >> right_shift
) &
607 UV_ACT_STATUS_MASK
)) << 1) == UV2H_DESC_BUSY
);
611 * Entered when a bau descriptor has gone into a permanent busy wait because
613 * Workaround the bug.
615 int handle_uv2_busy(struct bau_control
*bcp
)
617 struct ptc_stats
*stat
= bcp
->statp
;
624 static int uv2_3_wait_completion(struct bau_desc
*bau_desc
,
625 unsigned long mmr_offset
, int right_shift
,
626 struct bau_control
*bcp
, long try)
628 unsigned long descriptor_stat
;
630 int desc
= bcp
->uvhub_cpu
;
632 struct ptc_stats
*stat
= bcp
->statp
;
634 descriptor_stat
= uv2_3_read_status(mmr_offset
, right_shift
, desc
);
636 /* spin on the status MMR, waiting for it to go idle */
637 while (descriptor_stat
!= UV2H_DESC_IDLE
) {
638 if ((descriptor_stat
== UV2H_DESC_SOURCE_TIMEOUT
)) {
640 * A h/w bug on the destination side may
641 * have prevented the message being marked
642 * pending, thus it doesn't get replied to
643 * and gets continually nacked until it times
644 * out with a SOURCE_TIMEOUT.
648 } else if (descriptor_stat
== UV2H_DESC_DEST_TIMEOUT
) {
652 * Our retries may be blocked by all destination
653 * swack resources being consumed, and a timeout
654 * pending. In that case hardware returns the
655 * ERROR that looks like a destination timeout.
656 * Without using the extended status we have to
657 * deduce from the short time that this was a
660 if (cycles_2_us(ttm
- bcp
->send_message
) < timeout_us
) {
661 bcp
->conseccompletes
= 0;
663 /* FLUSH_RETRY_PLUGGED causes hang on boot */
667 bcp
->conseccompletes
= 0;
668 /* FLUSH_RETRY_TIMEOUT causes hang on boot */
672 if (busy_reps
> 1000000) {
673 /* not to hammer on the clock */
676 if ((ttm
- bcp
->send_message
) > bcp
->timeout_interval
)
677 return handle_uv2_busy(bcp
);
680 * descriptor_stat is still BUSY
684 descriptor_stat
= uv2_3_read_status(mmr_offset
, right_shift
, desc
);
686 bcp
->conseccompletes
++;
687 return FLUSH_COMPLETE
;
691 * There are 2 status registers; each and array[32] of 2 bits. Set up for
692 * which register to read and position in that register based on cpu in
695 static int wait_completion(struct bau_desc
*bau_desc
, struct bau_control
*bcp
, long try)
698 unsigned long mmr_offset
;
699 int desc
= bcp
->uvhub_cpu
;
701 if (desc
< UV_CPUS_PER_AS
) {
702 mmr_offset
= UVH_LB_BAU_SB_ACTIVATION_STATUS_0
;
703 right_shift
= desc
* UV_ACT_STATUS_SIZE
;
705 mmr_offset
= UVH_LB_BAU_SB_ACTIVATION_STATUS_1
;
706 right_shift
= ((desc
- UV_CPUS_PER_AS
) * UV_ACT_STATUS_SIZE
);
709 if (bcp
->uvhub_version
== 1)
710 return uv1_wait_completion(bau_desc
, mmr_offset
, right_shift
, bcp
, try);
712 return uv2_3_wait_completion(bau_desc
, mmr_offset
, right_shift
, bcp
, try);
716 * Our retries are blocked by all destination sw ack resources being
717 * in use, and a timeout is pending. In that case hardware immediately
718 * returns the ERROR that looks like a destination timeout.
720 static void destination_plugged(struct bau_desc
*bau_desc
,
721 struct bau_control
*bcp
,
722 struct bau_control
*hmaster
, struct ptc_stats
*stat
)
724 udelay(bcp
->plugged_delay
);
725 bcp
->plugged_tries
++;
727 if (bcp
->plugged_tries
>= bcp
->plugsb4reset
) {
728 bcp
->plugged_tries
= 0;
730 quiesce_local_uvhub(hmaster
);
732 spin_lock(&hmaster
->queue_lock
);
733 reset_with_ipi(&bau_desc
->distribution
, bcp
);
734 spin_unlock(&hmaster
->queue_lock
);
736 end_uvhub_quiesce(hmaster
);
739 stat
->s_resets_plug
++;
743 static void destination_timeout(struct bau_desc
*bau_desc
,
744 struct bau_control
*bcp
, struct bau_control
*hmaster
,
745 struct ptc_stats
*stat
)
747 hmaster
->max_concurr
= 1;
748 bcp
->timeout_tries
++;
749 if (bcp
->timeout_tries
>= bcp
->timeoutsb4reset
) {
750 bcp
->timeout_tries
= 0;
752 quiesce_local_uvhub(hmaster
);
754 spin_lock(&hmaster
->queue_lock
);
755 reset_with_ipi(&bau_desc
->distribution
, bcp
);
756 spin_unlock(&hmaster
->queue_lock
);
758 end_uvhub_quiesce(hmaster
);
761 stat
->s_resets_timeout
++;
766 * Stop all cpus on a uvhub from using the BAU for a period of time.
767 * This is reversed by check_enable.
769 static void disable_for_period(struct bau_control
*bcp
, struct ptc_stats
*stat
)
772 struct bau_control
*tbcp
;
773 struct bau_control
*hmaster
;
776 hmaster
= bcp
->uvhub_master
;
777 spin_lock(&hmaster
->disable_lock
);
778 if (!bcp
->baudisabled
) {
779 stat
->s_bau_disabled
++;
781 for_each_present_cpu(tcpu
) {
782 tbcp
= &per_cpu(bau_control
, tcpu
);
783 if (tbcp
->uvhub_master
== hmaster
) {
784 tbcp
->baudisabled
= 1;
785 tbcp
->set_bau_on_time
=
786 tm1
+ bcp
->disabled_period
;
790 spin_unlock(&hmaster
->disable_lock
);
793 static void count_max_concurr(int stat
, struct bau_control
*bcp
,
794 struct bau_control
*hmaster
)
796 bcp
->plugged_tries
= 0;
797 bcp
->timeout_tries
= 0;
798 if (stat
!= FLUSH_COMPLETE
)
800 if (bcp
->conseccompletes
<= bcp
->complete_threshold
)
802 if (hmaster
->max_concurr
>= hmaster
->max_concurr_const
)
804 hmaster
->max_concurr
++;
807 static void record_send_stats(cycles_t time1
, cycles_t time2
,
808 struct bau_control
*bcp
, struct ptc_stats
*stat
,
809 int completion_status
, int try)
814 elapsed
= time2
- time1
;
815 stat
->s_time
+= elapsed
;
817 if ((completion_status
== FLUSH_COMPLETE
) && (try == 1)) {
818 bcp
->period_requests
++;
819 bcp
->period_time
+= elapsed
;
820 if ((elapsed
> congested_cycles
) &&
821 (bcp
->period_requests
> bcp
->cong_reps
) &&
822 ((bcp
->period_time
/ bcp
->period_requests
) >
825 disable_for_period(bcp
, stat
);
831 if (completion_status
== FLUSH_COMPLETE
&& try > 1)
833 else if (completion_status
== FLUSH_GIVEUP
) {
835 if (get_cycles() > bcp
->period_end
)
836 bcp
->period_giveups
= 0;
837 bcp
->period_giveups
++;
838 if (bcp
->period_giveups
== 1)
839 bcp
->period_end
= get_cycles() + bcp
->disabled_period
;
840 if (bcp
->period_giveups
> bcp
->giveup_limit
) {
841 disable_for_period(bcp
, stat
);
842 stat
->s_giveuplimit
++;
848 * Because of a uv1 hardware bug only a limited number of concurrent
849 * requests can be made.
851 static void uv1_throttle(struct bau_control
*hmaster
, struct ptc_stats
*stat
)
853 spinlock_t
*lock
= &hmaster
->uvhub_lock
;
856 v
= &hmaster
->active_descriptor_count
;
857 if (!atomic_inc_unless_ge(lock
, v
, hmaster
->max_concurr
)) {
861 } while (!atomic_inc_unless_ge(lock
, v
, hmaster
->max_concurr
));
866 * Handle the completion status of a message send.
868 static void handle_cmplt(int completion_status
, struct bau_desc
*bau_desc
,
869 struct bau_control
*bcp
, struct bau_control
*hmaster
,
870 struct ptc_stats
*stat
)
872 if (completion_status
== FLUSH_RETRY_PLUGGED
)
873 destination_plugged(bau_desc
, bcp
, hmaster
, stat
);
874 else if (completion_status
== FLUSH_RETRY_TIMEOUT
)
875 destination_timeout(bau_desc
, bcp
, hmaster
, stat
);
879 * Send a broadcast and wait for it to complete.
881 * The flush_mask contains the cpus the broadcast is to be sent to including
882 * cpus that are on the local uvhub.
884 * Returns 0 if all flushing represented in the mask was done.
885 * Returns 1 if it gives up entirely and the original cpu mask is to be
886 * returned to the kernel.
888 int uv_flush_send_and_wait(struct cpumask
*flush_mask
, struct bau_control
*bcp
,
889 struct bau_desc
*bau_desc
)
892 int completion_stat
= 0;
898 struct ptc_stats
*stat
= bcp
->statp
;
899 struct bau_control
*hmaster
= bcp
->uvhub_master
;
900 struct uv1_bau_msg_header
*uv1_hdr
= NULL
;
901 struct uv2_3_bau_msg_header
*uv2_3_hdr
= NULL
;
903 if (bcp
->uvhub_version
== 1) {
905 uv1_throttle(hmaster
, stat
);
908 while (hmaster
->uvhub_quiesce
)
911 time1
= get_cycles();
913 uv1_hdr
= &bau_desc
->header
.uv1_hdr
;
916 uv2_3_hdr
= &bau_desc
->header
.uv2_3_hdr
;
921 uv1_hdr
->msg_type
= MSG_REGULAR
;
923 uv2_3_hdr
->msg_type
= MSG_REGULAR
;
924 seq_number
= bcp
->message_number
++;
927 uv1_hdr
->msg_type
= MSG_RETRY
;
929 uv2_3_hdr
->msg_type
= MSG_RETRY
;
930 stat
->s_retry_messages
++;
934 uv1_hdr
->sequence
= seq_number
;
936 uv2_3_hdr
->sequence
= seq_number
;
937 index
= (1UL << AS_PUSH_SHIFT
) | bcp
->uvhub_cpu
;
938 bcp
->send_message
= get_cycles();
940 write_mmr_activation(index
);
943 completion_stat
= wait_completion(bau_desc
, bcp
, try);
945 handle_cmplt(completion_stat
, bau_desc
, bcp
, hmaster
, stat
);
947 if (bcp
->ipi_attempts
>= bcp
->ipi_reset_limit
) {
948 bcp
->ipi_attempts
= 0;
949 stat
->s_overipilimit
++;
950 completion_stat
= FLUSH_GIVEUP
;
954 } while ((completion_stat
== FLUSH_RETRY_PLUGGED
) ||
955 (completion_stat
== FLUSH_RETRY_TIMEOUT
));
957 time2
= get_cycles();
959 count_max_concurr(completion_stat
, bcp
, hmaster
);
961 while (hmaster
->uvhub_quiesce
)
964 atomic_dec(&hmaster
->active_descriptor_count
);
966 record_send_stats(time1
, time2
, bcp
, stat
, completion_stat
, try);
968 if (completion_stat
== FLUSH_GIVEUP
)
969 /* FLUSH_GIVEUP will fall back to using IPI's for tlb flush */
975 * The BAU is disabled for this uvhub. When the disabled time period has
976 * expired re-enable it.
977 * Return 0 if it is re-enabled for all cpus on this uvhub.
979 static int check_enable(struct bau_control
*bcp
, struct ptc_stats
*stat
)
982 struct bau_control
*tbcp
;
983 struct bau_control
*hmaster
;
985 hmaster
= bcp
->uvhub_master
;
986 spin_lock(&hmaster
->disable_lock
);
987 if (bcp
->baudisabled
&& (get_cycles() >= bcp
->set_bau_on_time
)) {
988 stat
->s_bau_reenabled
++;
989 for_each_present_cpu(tcpu
) {
990 tbcp
= &per_cpu(bau_control
, tcpu
);
991 if (tbcp
->uvhub_master
== hmaster
) {
992 tbcp
->baudisabled
= 0;
993 tbcp
->period_requests
= 0;
994 tbcp
->period_time
= 0;
995 tbcp
->period_giveups
= 0;
998 spin_unlock(&hmaster
->disable_lock
);
1001 spin_unlock(&hmaster
->disable_lock
);
1005 static void record_send_statistics(struct ptc_stats
*stat
, int locals
, int hubs
,
1006 int remotes
, struct bau_desc
*bau_desc
)
1008 stat
->s_requestor
++;
1009 stat
->s_ntargcpu
+= remotes
+ locals
;
1010 stat
->s_ntargremotes
+= remotes
;
1011 stat
->s_ntarglocals
+= locals
;
1013 /* uvhub statistics */
1014 hubs
= bau_uvhub_weight(&bau_desc
->distribution
);
1016 stat
->s_ntarglocaluvhub
++;
1017 stat
->s_ntargremoteuvhub
+= (hubs
- 1);
1019 stat
->s_ntargremoteuvhub
+= hubs
;
1021 stat
->s_ntarguvhub
+= hubs
;
1024 stat
->s_ntarguvhub16
++;
1026 stat
->s_ntarguvhub8
++;
1028 stat
->s_ntarguvhub4
++;
1030 stat
->s_ntarguvhub2
++;
1032 stat
->s_ntarguvhub1
++;
1036 * Translate a cpu mask to the uvhub distribution mask in the BAU
1037 * activation descriptor.
1039 static int set_distrib_bits(struct cpumask
*flush_mask
, struct bau_control
*bcp
,
1040 struct bau_desc
*bau_desc
, int *localsp
, int *remotesp
)
1045 struct hub_and_pnode
*hpp
;
1047 for_each_cpu(cpu
, flush_mask
) {
1049 * The distribution vector is a bit map of pnodes, relative
1050 * to the partition base pnode (and the partition base nasid
1052 * Translate cpu to pnode and hub using a local memory array.
1054 hpp
= &bcp
->socket_master
->thp
[cpu
];
1055 pnode
= hpp
->pnode
- bcp
->partition_base_pnode
;
1056 bau_uvhub_set(pnode
, &bau_desc
->distribution
);
1058 if (hpp
->uvhub
== bcp
->uvhub
)
1069 * globally purge translation cache of a virtual address or all TLB's
1070 * @cpumask: mask of all cpu's in which the address is to be removed
1071 * @mm: mm_struct containing virtual address range
1072 * @start: start virtual address to be removed from TLB
1073 * @end: end virtual address to be remove from TLB
1074 * @cpu: the current cpu
1076 * This is the entry point for initiating any UV global TLB shootdown.
1078 * Purges the translation caches of all specified processors of the given
1079 * virtual address, or purges all TLB's on specified processors.
1081 * The caller has derived the cpumask from the mm_struct. This function
1082 * is called only if there are bits set in the mask. (e.g. flush_tlb_page())
1084 * The cpumask is converted into a uvhubmask of the uvhubs containing
1087 * Note that this function should be called with preemption disabled.
1089 * Returns NULL if all remote flushing was done.
1090 * Returns pointer to cpumask if some remote flushing remains to be
1091 * done. The returned pointer is valid till preemption is re-enabled.
1093 const struct cpumask
*uv_flush_tlb_others(const struct cpumask
*cpumask
,
1094 struct mm_struct
*mm
,
1095 unsigned long start
,
1102 struct bau_desc
*bau_desc
;
1103 struct cpumask
*flush_mask
;
1104 struct ptc_stats
*stat
;
1105 struct bau_control
*bcp
;
1106 unsigned long descriptor_status
;
1107 unsigned long status
;
1109 bcp
= &per_cpu(bau_control
, cpu
);
1119 read_lmmr(UVH_LB_BAU_SB_ACTIVATION_STATUS_0
);
1120 status
= ((descriptor_status
>> (bcp
->uvhub_cpu
*
1121 UV_ACT_STATUS_SIZE
)) & UV_ACT_STATUS_MASK
) << 1;
1122 if (status
== UV2H_DESC_BUSY
)
1127 /* bau was disabled due to slow response */
1128 if (bcp
->baudisabled
) {
1129 if (check_enable(bcp
, stat
)) {
1130 stat
->s_ipifordisabled
++;
1136 * Each sending cpu has a per-cpu mask which it fills from the caller's
1137 * cpu mask. All cpus are converted to uvhubs and copied to the
1138 * activation descriptor.
1140 flush_mask
= (struct cpumask
*)per_cpu(uv_flush_tlb_mask
, cpu
);
1141 /* don't actually do a shootdown of the local cpu */
1142 cpumask_andnot(flush_mask
, cpumask
, cpumask_of(cpu
));
1144 if (cpumask_test_cpu(cpu
, cpumask
))
1145 stat
->s_ntargself
++;
1147 bau_desc
= bcp
->descriptor_base
;
1148 bau_desc
+= (ITEMS_PER_DESC
* bcp
->uvhub_cpu
);
1149 bau_uvhubs_clear(&bau_desc
->distribution
, UV_DISTRIBUTION_SIZE
);
1150 if (set_distrib_bits(flush_mask
, bcp
, bau_desc
, &locals
, &remotes
))
1153 record_send_statistics(stat
, locals
, hubs
, remotes
, bau_desc
);
1155 if (!end
|| (end
- start
) <= PAGE_SIZE
)
1156 bau_desc
->payload
.address
= start
;
1158 bau_desc
->payload
.address
= TLB_FLUSH_ALL
;
1159 bau_desc
->payload
.sending_cpu
= cpu
;
1161 * uv_flush_send_and_wait returns 0 if all cpu's were messaged,
1162 * or 1 if it gave up and the original cpumask should be returned.
1164 if (!uv_flush_send_and_wait(flush_mask
, bcp
, bau_desc
))
1171 * Search the message queue for any 'other' unprocessed message with the
1172 * same software acknowledge resource bit vector as the 'msg' message.
1174 struct bau_pq_entry
*find_another_by_swack(struct bau_pq_entry
*msg
,
1175 struct bau_control
*bcp
)
1177 struct bau_pq_entry
*msg_next
= msg
+ 1;
1178 unsigned char swack_vec
= msg
->swack_vec
;
1180 if (msg_next
> bcp
->queue_last
)
1181 msg_next
= bcp
->queue_first
;
1182 while (msg_next
!= msg
) {
1183 if ((msg_next
->canceled
== 0) && (msg_next
->replied_to
== 0) &&
1184 (msg_next
->swack_vec
== swack_vec
))
1187 if (msg_next
> bcp
->queue_last
)
1188 msg_next
= bcp
->queue_first
;
1194 * UV2 needs to work around a bug in which an arriving message has not
1195 * set a bit in the UVH_LB_BAU_INTD_SOFTWARE_ACKNOWLEDGE register.
1196 * Such a message must be ignored.
1198 void process_uv2_message(struct msg_desc
*mdp
, struct bau_control
*bcp
)
1200 unsigned long mmr_image
;
1201 unsigned char swack_vec
;
1202 struct bau_pq_entry
*msg
= mdp
->msg
;
1203 struct bau_pq_entry
*other_msg
;
1205 mmr_image
= read_mmr_sw_ack();
1206 swack_vec
= msg
->swack_vec
;
1208 if ((swack_vec
& mmr_image
) == 0) {
1210 * This message was assigned a swack resource, but no
1211 * reserved acknowlegment is pending.
1212 * The bug has prevented this message from setting the MMR.
1215 * Some message has set the MMR 'pending' bit; it might have
1216 * been another message. Look for that message.
1218 other_msg
= find_another_by_swack(msg
, bcp
);
1221 * There is another. Process this one but do not
1224 bau_process_message(mdp
, bcp
, 0);
1226 * Let the natural processing of that other message
1227 * acknowledge it. Don't get the processing of sw_ack's
1235 * Either the MMR shows this one pending a reply or there is no
1236 * other message using this sw_ack, so it is safe to acknowledge it.
1238 bau_process_message(mdp
, bcp
, 1);
1244 * The BAU message interrupt comes here. (registered by set_intr_gate)
1247 * We received a broadcast assist message.
1249 * Interrupts are disabled; this interrupt could represent
1250 * the receipt of several messages.
1252 * All cores/threads on this hub get this interrupt.
1253 * The last one to see it does the software ack.
1254 * (the resource will not be freed until noninterruptable cpus see this
1255 * interrupt; hardware may timeout the s/w ack and reply ERROR)
1257 void uv_bau_message_interrupt(struct pt_regs
*regs
)
1260 cycles_t time_start
;
1261 struct bau_pq_entry
*msg
;
1262 struct bau_control
*bcp
;
1263 struct ptc_stats
*stat
;
1264 struct msg_desc msgdesc
;
1267 time_start
= get_cycles();
1269 bcp
= &per_cpu(bau_control
, smp_processor_id());
1272 msgdesc
.queue_first
= bcp
->queue_first
;
1273 msgdesc
.queue_last
= bcp
->queue_last
;
1275 msg
= bcp
->bau_msg_head
;
1276 while (msg
->swack_vec
) {
1279 msgdesc
.msg_slot
= msg
- msgdesc
.queue_first
;
1281 if (bcp
->uvhub_version
== 2)
1282 process_uv2_message(&msgdesc
, bcp
);
1284 /* no error workaround for uv1 or uv3 */
1285 bau_process_message(&msgdesc
, bcp
, 1);
1288 if (msg
> msgdesc
.queue_last
)
1289 msg
= msgdesc
.queue_first
;
1290 bcp
->bau_msg_head
= msg
;
1292 stat
->d_time
+= (get_cycles() - time_start
);
1300 * Each target uvhub (i.e. a uvhub that has cpu's) needs to have
1301 * shootdown message timeouts enabled. The timeout does not cause
1302 * an interrupt, but causes an error message to be returned to
1305 static void __init
enable_timeouts(void)
1310 unsigned long mmr_image
;
1312 nuvhubs
= uv_num_possible_blades();
1314 for (uvhub
= 0; uvhub
< nuvhubs
; uvhub
++) {
1315 if (!uv_blade_nr_possible_cpus(uvhub
))
1318 pnode
= uv_blade_to_pnode(uvhub
);
1319 mmr_image
= read_mmr_misc_control(pnode
);
1321 * Set the timeout period and then lock it in, in three
1322 * steps; captures and locks in the period.
1324 * To program the period, the SOFT_ACK_MODE must be off.
1326 mmr_image
&= ~(1L << SOFTACK_MSHIFT
);
1327 write_mmr_misc_control(pnode
, mmr_image
);
1329 * Set the 4-bit period.
1331 mmr_image
&= ~((unsigned long)0xf << SOFTACK_PSHIFT
);
1332 mmr_image
|= (SOFTACK_TIMEOUT_PERIOD
<< SOFTACK_PSHIFT
);
1333 write_mmr_misc_control(pnode
, mmr_image
);
1336 * Subsequent reversals of the timebase bit (3) cause an
1337 * immediate timeout of one or all INTD resources as
1338 * indicated in bits 2:0 (7 causes all of them to timeout).
1340 mmr_image
|= (1L << SOFTACK_MSHIFT
);
1342 /* do not touch the legacy mode bit */
1343 /* hw bug workaround; do not use extended status */
1344 mmr_image
&= ~(1L << UV2_EXT_SHFT
);
1345 } else if (is_uv3_hub()) {
1346 mmr_image
&= ~(1L << PREFETCH_HINT_SHFT
);
1347 mmr_image
|= (1L << SB_STATUS_SHFT
);
1349 write_mmr_misc_control(pnode
, mmr_image
);
1353 static void *ptc_seq_start(struct seq_file
*file
, loff_t
*offset
)
1355 if (*offset
< num_possible_cpus())
1360 static void *ptc_seq_next(struct seq_file
*file
, void *data
, loff_t
*offset
)
1363 if (*offset
< num_possible_cpus())
1368 static void ptc_seq_stop(struct seq_file
*file
, void *data
)
1373 * Display the statistics thru /proc/sgi_uv/ptc_statistics
1374 * 'data' points to the cpu number
1375 * Note: see the descriptions in stat_description[].
1377 static int ptc_seq_show(struct seq_file
*file
, void *data
)
1379 struct ptc_stats
*stat
;
1380 struct bau_control
*bcp
;
1383 cpu
= *(loff_t
*)data
;
1386 "# cpu bauoff sent stime self locals remotes ncpus localhub ");
1387 seq_puts(file
, "remotehub numuvhubs numuvhubs16 numuvhubs8 ");
1389 "numuvhubs4 numuvhubs2 numuvhubs1 dto snacks retries ");
1391 "rok resetp resett giveup sto bz throt disable ");
1393 "enable wars warshw warwaits enters ipidis plugged ");
1395 "ipiover glim cong swack recv rtime all one mult ");
1396 seq_puts(file
, "none retry canc nocan reset rcan\n");
1398 if (cpu
< num_possible_cpus() && cpu_online(cpu
)) {
1399 bcp
= &per_cpu(bau_control
, cpu
);
1401 seq_printf(file
, "cpu %d bau disabled\n", cpu
);
1405 /* source side statistics */
1407 "cpu %d %d %ld %ld %ld %ld %ld %ld %ld %ld %ld %ld ",
1408 cpu
, bcp
->nobau
, stat
->s_requestor
,
1409 cycles_2_us(stat
->s_time
),
1410 stat
->s_ntargself
, stat
->s_ntarglocals
,
1411 stat
->s_ntargremotes
, stat
->s_ntargcpu
,
1412 stat
->s_ntarglocaluvhub
, stat
->s_ntargremoteuvhub
,
1413 stat
->s_ntarguvhub
, stat
->s_ntarguvhub16
);
1414 seq_printf(file
, "%ld %ld %ld %ld %ld %ld ",
1415 stat
->s_ntarguvhub8
, stat
->s_ntarguvhub4
,
1416 stat
->s_ntarguvhub2
, stat
->s_ntarguvhub1
,
1417 stat
->s_dtimeout
, stat
->s_strongnacks
);
1418 seq_printf(file
, "%ld %ld %ld %ld %ld %ld %ld %ld ",
1419 stat
->s_retry_messages
, stat
->s_retriesok
,
1420 stat
->s_resets_plug
, stat
->s_resets_timeout
,
1421 stat
->s_giveup
, stat
->s_stimeout
,
1422 stat
->s_busy
, stat
->s_throttles
);
1423 seq_printf(file
, "%ld %ld %ld %ld %ld %ld %ld %ld %ld %ld %ld ",
1424 stat
->s_bau_disabled
, stat
->s_bau_reenabled
,
1425 stat
->s_uv2_wars
, stat
->s_uv2_wars_hw
,
1426 stat
->s_uv2_war_waits
, stat
->s_enters
,
1427 stat
->s_ipifordisabled
, stat
->s_plugged
,
1428 stat
->s_overipilimit
, stat
->s_giveuplimit
,
1431 /* destination side statistics */
1433 "%lx %ld %ld %ld %ld %ld %ld %ld %ld %ld %ld %ld\n",
1434 read_gmmr_sw_ack(uv_cpu_to_pnode(cpu
)),
1435 stat
->d_requestee
, cycles_2_us(stat
->d_time
),
1436 stat
->d_alltlb
, stat
->d_onetlb
, stat
->d_multmsg
,
1437 stat
->d_nomsg
, stat
->d_retries
, stat
->d_canceled
,
1438 stat
->d_nocanceled
, stat
->d_resets
,
1445 * Display the tunables thru debugfs
1447 static ssize_t
tunables_read(struct file
*file
, char __user
*userbuf
,
1448 size_t count
, loff_t
*ppos
)
1453 buf
= kasprintf(GFP_KERNEL
, "%s %s %s\n%d %d %d %d %d %d %d %d %d %d\n",
1454 "max_concur plugged_delay plugsb4reset timeoutsb4reset",
1455 "ipi_reset_limit complete_threshold congested_response_us",
1456 "congested_reps disabled_period giveup_limit",
1457 max_concurr
, plugged_delay
, plugsb4reset
,
1458 timeoutsb4reset
, ipi_reset_limit
, complete_threshold
,
1459 congested_respns_us
, congested_reps
, disabled_period
,
1465 ret
= simple_read_from_buffer(userbuf
, count
, ppos
, buf
, strlen(buf
));
1471 * handle a write to /proc/sgi_uv/ptc_statistics
1472 * -1: reset the statistics
1473 * 0: display meaning of the statistics
1475 static ssize_t
ptc_proc_write(struct file
*file
, const char __user
*user
,
1476 size_t count
, loff_t
*data
)
1483 struct ptc_stats
*stat
;
1485 if (count
== 0 || count
> sizeof(optstr
))
1487 if (copy_from_user(optstr
, user
, count
))
1489 optstr
[count
- 1] = '\0';
1491 if (!strcmp(optstr
, "on")) {
1494 } else if (!strcmp(optstr
, "off")) {
1499 if (kstrtol(optstr
, 10, &input_arg
) < 0) {
1500 printk(KERN_DEBUG
"%s is invalid\n", optstr
);
1504 if (input_arg
== 0) {
1505 elements
= ARRAY_SIZE(stat_description
);
1506 printk(KERN_DEBUG
"# cpu: cpu number\n");
1507 printk(KERN_DEBUG
"Sender statistics:\n");
1508 for (i
= 0; i
< elements
; i
++)
1509 printk(KERN_DEBUG
"%s\n", stat_description
[i
]);
1510 } else if (input_arg
== -1) {
1511 for_each_present_cpu(cpu
) {
1512 stat
= &per_cpu(ptcstats
, cpu
);
1513 memset(stat
, 0, sizeof(struct ptc_stats
));
1520 static int local_atoi(const char *name
)
1527 val
= 10*val
+(*name
-'0');
1536 * Parse the values written to /sys/kernel/debug/sgi_uv/bau_tunables.
1537 * Zero values reset them to defaults.
1539 static int parse_tunables_write(struct bau_control
*bcp
, char *instr
,
1546 int e
= ARRAY_SIZE(tunables
);
1548 p
= instr
+ strspn(instr
, WHITESPACE
);
1550 for (; *p
; p
= q
+ strspn(q
, WHITESPACE
)) {
1551 q
= p
+ strcspn(p
, WHITESPACE
);
1557 printk(KERN_INFO
"bau tunable error: should be %d values\n", e
);
1561 p
= instr
+ strspn(instr
, WHITESPACE
);
1563 for (cnt
= 0; *p
; p
= q
+ strspn(q
, WHITESPACE
), cnt
++) {
1564 q
= p
+ strcspn(p
, WHITESPACE
);
1565 val
= local_atoi(p
);
1569 max_concurr
= MAX_BAU_CONCURRENT
;
1570 max_concurr_const
= MAX_BAU_CONCURRENT
;
1573 if (val
< 1 || val
> bcp
->cpus_in_uvhub
) {
1575 "Error: BAU max concurrent %d is invalid\n",
1580 max_concurr_const
= val
;
1584 *tunables
[cnt
].tunp
= tunables
[cnt
].deflt
;
1586 *tunables
[cnt
].tunp
= val
;
1596 * Handle a write to debugfs. (/sys/kernel/debug/sgi_uv/bau_tunables)
1598 static ssize_t
tunables_write(struct file
*file
, const char __user
*user
,
1599 size_t count
, loff_t
*data
)
1604 struct bau_control
*bcp
;
1606 if (count
== 0 || count
> sizeof(instr
)-1)
1608 if (copy_from_user(instr
, user
, count
))
1611 instr
[count
] = '\0';
1614 bcp
= &per_cpu(bau_control
, cpu
);
1615 ret
= parse_tunables_write(bcp
, instr
, count
);
1620 for_each_present_cpu(cpu
) {
1621 bcp
= &per_cpu(bau_control
, cpu
);
1622 bcp
->max_concurr
= max_concurr
;
1623 bcp
->max_concurr_const
= max_concurr
;
1624 bcp
->plugged_delay
= plugged_delay
;
1625 bcp
->plugsb4reset
= plugsb4reset
;
1626 bcp
->timeoutsb4reset
= timeoutsb4reset
;
1627 bcp
->ipi_reset_limit
= ipi_reset_limit
;
1628 bcp
->complete_threshold
= complete_threshold
;
1629 bcp
->cong_response_us
= congested_respns_us
;
1630 bcp
->cong_reps
= congested_reps
;
1631 bcp
->disabled_period
= sec_2_cycles(disabled_period
);
1632 bcp
->giveup_limit
= giveup_limit
;
1637 static const struct seq_operations uv_ptc_seq_ops
= {
1638 .start
= ptc_seq_start
,
1639 .next
= ptc_seq_next
,
1640 .stop
= ptc_seq_stop
,
1641 .show
= ptc_seq_show
1644 static int ptc_proc_open(struct inode
*inode
, struct file
*file
)
1646 return seq_open(file
, &uv_ptc_seq_ops
);
1649 static int tunables_open(struct inode
*inode
, struct file
*file
)
1654 static const struct file_operations proc_uv_ptc_operations
= {
1655 .open
= ptc_proc_open
,
1657 .write
= ptc_proc_write
,
1658 .llseek
= seq_lseek
,
1659 .release
= seq_release
,
1662 static const struct file_operations tunables_fops
= {
1663 .open
= tunables_open
,
1664 .read
= tunables_read
,
1665 .write
= tunables_write
,
1666 .llseek
= default_llseek
,
1669 static int __init
uv_ptc_init(void)
1671 struct proc_dir_entry
*proc_uv_ptc
;
1673 if (!is_uv_system())
1676 proc_uv_ptc
= proc_create(UV_PTC_BASENAME
, 0444, NULL
,
1677 &proc_uv_ptc_operations
);
1679 printk(KERN_ERR
"unable to create %s proc entry\n",
1684 tunables_dir
= debugfs_create_dir(UV_BAU_TUNABLES_DIR
, NULL
);
1685 if (!tunables_dir
) {
1686 printk(KERN_ERR
"unable to create debugfs directory %s\n",
1687 UV_BAU_TUNABLES_DIR
);
1690 tunables_file
= debugfs_create_file(UV_BAU_TUNABLES_FILE
, 0600,
1691 tunables_dir
, NULL
, &tunables_fops
);
1692 if (!tunables_file
) {
1693 printk(KERN_ERR
"unable to create debugfs file %s\n",
1694 UV_BAU_TUNABLES_FILE
);
1701 * Initialize the sending side's sending buffers.
1703 static void activation_descriptor_init(int node
, int pnode
, int base_pnode
)
1712 struct bau_desc
*bau_desc
;
1713 struct bau_desc
*bd2
;
1714 struct uv1_bau_msg_header
*uv1_hdr
;
1715 struct uv2_3_bau_msg_header
*uv2_3_hdr
;
1716 struct bau_control
*bcp
;
1719 * each bau_desc is 64 bytes; there are 8 (ITEMS_PER_DESC)
1720 * per cpu; and one per cpu on the uvhub (ADP_SZ)
1722 dsize
= sizeof(struct bau_desc
) * ADP_SZ
* ITEMS_PER_DESC
;
1723 bau_desc
= kmalloc_node(dsize
, GFP_KERNEL
, node
);
1726 gpa
= uv_gpa(bau_desc
);
1727 n
= uv_gpa_to_gnode(gpa
);
1728 m
= uv_gpa_to_offset(gpa
);
1732 /* the 14-bit pnode */
1733 write_mmr_descriptor_base(pnode
, (n
<< UV_DESC_PSHIFT
| m
));
1735 * Initializing all 8 (ITEMS_PER_DESC) descriptors for each
1736 * cpu even though we only use the first one; one descriptor can
1737 * describe a broadcast to 256 uv hubs.
1739 for (i
= 0, bd2
= bau_desc
; i
< (ADP_SZ
* ITEMS_PER_DESC
); i
++, bd2
++) {
1740 memset(bd2
, 0, sizeof(struct bau_desc
));
1742 uv1_hdr
= &bd2
->header
.uv1_hdr
;
1743 uv1_hdr
->swack_flag
= 1;
1745 * The base_dest_nasid set in the message header
1746 * is the nasid of the first uvhub in the partition.
1747 * The bit map will indicate destination pnode numbers
1748 * relative to that base. They may not be consecutive
1749 * if nasid striding is being used.
1751 uv1_hdr
->base_dest_nasid
=
1752 UV_PNODE_TO_NASID(base_pnode
);
1753 uv1_hdr
->dest_subnodeid
= UV_LB_SUBNODEID
;
1754 uv1_hdr
->command
= UV_NET_ENDPOINT_INTD
;
1755 uv1_hdr
->int_both
= 1;
1757 * all others need to be set to zero:
1758 * fairness chaining multilevel count replied_to
1762 * BIOS uses legacy mode, but uv2 and uv3 hardware always
1763 * uses native mode for selective broadcasts.
1765 uv2_3_hdr
= &bd2
->header
.uv2_3_hdr
;
1766 uv2_3_hdr
->swack_flag
= 1;
1767 uv2_3_hdr
->base_dest_nasid
=
1768 UV_PNODE_TO_NASID(base_pnode
);
1769 uv2_3_hdr
->dest_subnodeid
= UV_LB_SUBNODEID
;
1770 uv2_3_hdr
->command
= UV_NET_ENDPOINT_INTD
;
1773 for_each_present_cpu(cpu
) {
1774 if (pnode
!= uv_blade_to_pnode(uv_cpu_to_blade_id(cpu
)))
1776 bcp
= &per_cpu(bau_control
, cpu
);
1777 bcp
->descriptor_base
= bau_desc
;
1782 * initialize the destination side's receiving buffers
1783 * entered for each uvhub in the partition
1784 * - node is first node (kernel memory notion) on the uvhub
1785 * - pnode is the uvhub's physical identifier
1787 static void pq_init(int node
, int pnode
)
1794 unsigned long first
;
1795 unsigned long pn_first
;
1797 struct bau_pq_entry
*pqp
;
1798 struct bau_control
*bcp
;
1800 plsize
= (DEST_Q_SIZE
+ 1) * sizeof(struct bau_pq_entry
);
1801 vp
= kmalloc_node(plsize
, GFP_KERNEL
, node
);
1802 pqp
= (struct bau_pq_entry
*)vp
;
1805 cp
= (char *)pqp
+ 31;
1806 pqp
= (struct bau_pq_entry
*)(((unsigned long)cp
>> 5) << 5);
1808 for_each_present_cpu(cpu
) {
1809 if (pnode
!= uv_cpu_to_pnode(cpu
))
1811 /* for every cpu on this pnode: */
1812 bcp
= &per_cpu(bau_control
, cpu
);
1813 bcp
->queue_first
= pqp
;
1814 bcp
->bau_msg_head
= pqp
;
1815 bcp
->queue_last
= pqp
+ (DEST_Q_SIZE
- 1);
1818 * need the gnode of where the memory was really allocated
1820 pn
= uv_gpa_to_gnode(uv_gpa(pqp
));
1821 first
= uv_physnodeaddr(pqp
);
1822 pn_first
= ((unsigned long)pn
<< UV_PAYLOADQ_PNODE_SHIFT
) | first
;
1823 last
= uv_physnodeaddr(pqp
+ (DEST_Q_SIZE
- 1));
1824 write_mmr_payload_first(pnode
, pn_first
);
1825 write_mmr_payload_tail(pnode
, first
);
1826 write_mmr_payload_last(pnode
, last
);
1827 write_gmmr_sw_ack(pnode
, 0xffffUL
);
1829 /* in effect, all msg_type's are set to MSG_NOOP */
1830 memset(pqp
, 0, sizeof(struct bau_pq_entry
) * DEST_Q_SIZE
);
1834 * Initialization of each UV hub's structures
1836 static void __init
init_uvhub(int uvhub
, int vector
, int base_pnode
)
1840 unsigned long apicid
;
1842 node
= uvhub_to_first_node(uvhub
);
1843 pnode
= uv_blade_to_pnode(uvhub
);
1845 activation_descriptor_init(node
, pnode
, base_pnode
);
1847 pq_init(node
, pnode
);
1849 * The below initialization can't be in firmware because the
1850 * messaging IRQ will be determined by the OS.
1852 apicid
= uvhub_to_first_apicid(uvhub
) | uv_apicid_hibits
;
1853 write_mmr_data_config(pnode
, ((apicid
<< 32) | vector
));
1857 * We will set BAU_MISC_CONTROL with a timeout period.
1858 * But the BIOS has set UVH_AGING_PRESCALE_SEL and UVH_TRANSACTION_TIMEOUT.
1859 * So the destination timeout period has to be calculated from them.
1861 static int calculate_destination_timeout(void)
1863 unsigned long mmr_image
;
1869 unsigned long ts_ns
;
1872 mult1
= SOFTACK_TIMEOUT_PERIOD
& BAU_MISC_CONTROL_MULT_MASK
;
1873 mmr_image
= uv_read_local_mmr(UVH_AGING_PRESCALE_SEL
);
1874 index
= (mmr_image
>> BAU_URGENCY_7_SHIFT
) & BAU_URGENCY_7_MASK
;
1875 mmr_image
= uv_read_local_mmr(UVH_TRANSACTION_TIMEOUT
);
1876 mult2
= (mmr_image
>> BAU_TRANS_SHIFT
) & BAU_TRANS_MASK
;
1877 ts_ns
= timeout_base_ns
[index
];
1878 ts_ns
*= (mult1
* mult2
);
1881 /* same destination timeout for uv2 and uv3 */
1882 /* 4 bits 0/1 for 10/80us base, 3 bits of multiplier */
1883 mmr_image
= uv_read_local_mmr(UVH_LB_BAU_MISC_CONTROL
);
1884 mmr_image
= (mmr_image
& UV_SA_MASK
) >> UV_SA_SHFT
;
1885 if (mmr_image
& (1L << UV2_ACK_UNITS_SHFT
))
1889 mult1
= mmr_image
& UV2_ACK_MASK
;
1895 static void __init
init_per_cpu_tunables(void)
1898 struct bau_control
*bcp
;
1900 for_each_present_cpu(cpu
) {
1901 bcp
= &per_cpu(bau_control
, cpu
);
1902 bcp
->baudisabled
= 0;
1905 bcp
->statp
= &per_cpu(ptcstats
, cpu
);
1906 /* time interval to catch a hardware stay-busy bug */
1907 bcp
->timeout_interval
= usec_2_cycles(2*timeout_us
);
1908 bcp
->max_concurr
= max_concurr
;
1909 bcp
->max_concurr_const
= max_concurr
;
1910 bcp
->plugged_delay
= plugged_delay
;
1911 bcp
->plugsb4reset
= plugsb4reset
;
1912 bcp
->timeoutsb4reset
= timeoutsb4reset
;
1913 bcp
->ipi_reset_limit
= ipi_reset_limit
;
1914 bcp
->complete_threshold
= complete_threshold
;
1915 bcp
->cong_response_us
= congested_respns_us
;
1916 bcp
->cong_reps
= congested_reps
;
1917 bcp
->disabled_period
= sec_2_cycles(disabled_period
);
1918 bcp
->giveup_limit
= giveup_limit
;
1919 spin_lock_init(&bcp
->queue_lock
);
1920 spin_lock_init(&bcp
->uvhub_lock
);
1921 spin_lock_init(&bcp
->disable_lock
);
1926 * Scan all cpus to collect blade and socket summaries.
1928 static int __init
get_cpu_topology(int base_pnode
,
1929 struct uvhub_desc
*uvhub_descs
,
1930 unsigned char *uvhub_mask
)
1936 struct bau_control
*bcp
;
1937 struct uvhub_desc
*bdp
;
1938 struct socket_desc
*sdp
;
1940 for_each_present_cpu(cpu
) {
1941 bcp
= &per_cpu(bau_control
, cpu
);
1943 memset(bcp
, 0, sizeof(struct bau_control
));
1945 pnode
= uv_cpu_hub_info(cpu
)->pnode
;
1946 if ((pnode
- base_pnode
) >= UV_DISTRIBUTION_SIZE
) {
1948 "cpu %d pnode %d-%d beyond %d; BAU disabled\n",
1949 cpu
, pnode
, base_pnode
, UV_DISTRIBUTION_SIZE
);
1953 bcp
->osnode
= cpu_to_node(cpu
);
1954 bcp
->partition_base_pnode
= base_pnode
;
1956 uvhub
= uv_cpu_hub_info(cpu
)->numa_blade_id
;
1957 *(uvhub_mask
+ (uvhub
/8)) |= (1 << (uvhub
%8));
1958 bdp
= &uvhub_descs
[uvhub
];
1964 /* kludge: 'assuming' one node per socket, and assuming that
1965 disabling a socket just leaves a gap in node numbers */
1966 socket
= bcp
->osnode
& 1;
1967 bdp
->socket_mask
|= (1 << socket
);
1968 sdp
= &bdp
->socket
[socket
];
1969 sdp
->cpu_number
[sdp
->num_cpus
] = cpu
;
1971 if (sdp
->num_cpus
> MAX_CPUS_PER_SOCKET
) {
1972 printk(KERN_EMERG
"%d cpus per socket invalid\n",
1981 * Each socket is to get a local array of pnodes/hubs.
1983 static void make_per_cpu_thp(struct bau_control
*smaster
)
1986 size_t hpsz
= sizeof(struct hub_and_pnode
) * num_possible_cpus();
1988 smaster
->thp
= kmalloc_node(hpsz
, GFP_KERNEL
, smaster
->osnode
);
1989 memset(smaster
->thp
, 0, hpsz
);
1990 for_each_present_cpu(cpu
) {
1991 smaster
->thp
[cpu
].pnode
= uv_cpu_hub_info(cpu
)->pnode
;
1992 smaster
->thp
[cpu
].uvhub
= uv_cpu_hub_info(cpu
)->numa_blade_id
;
1997 * Each uvhub is to get a local cpumask.
1999 static void make_per_hub_cpumask(struct bau_control
*hmaster
)
2001 int sz
= sizeof(cpumask_t
);
2003 hmaster
->cpumask
= kzalloc_node(sz
, GFP_KERNEL
, hmaster
->osnode
);
2007 * Initialize all the per_cpu information for the cpu's on a given socket,
2008 * given what has been gathered into the socket_desc struct.
2009 * And reports the chosen hub and socket masters back to the caller.
2011 static int scan_sock(struct socket_desc
*sdp
, struct uvhub_desc
*bdp
,
2012 struct bau_control
**smasterp
,
2013 struct bau_control
**hmasterp
)
2017 struct bau_control
*bcp
;
2019 for (i
= 0; i
< sdp
->num_cpus
; i
++) {
2020 cpu
= sdp
->cpu_number
[i
];
2021 bcp
= &per_cpu(bau_control
, cpu
);
2028 bcp
->cpus_in_uvhub
= bdp
->num_cpus
;
2029 bcp
->cpus_in_socket
= sdp
->num_cpus
;
2030 bcp
->socket_master
= *smasterp
;
2031 bcp
->uvhub
= bdp
->uvhub
;
2033 bcp
->uvhub_version
= 1;
2034 else if (is_uv2_hub())
2035 bcp
->uvhub_version
= 2;
2036 else if (is_uv3_hub())
2037 bcp
->uvhub_version
= 3;
2039 printk(KERN_EMERG
"uvhub version not 1, 2 or 3\n");
2042 bcp
->uvhub_master
= *hmasterp
;
2043 bcp
->uvhub_cpu
= uv_cpu_hub_info(cpu
)->blade_processor_id
;
2044 if (bcp
->uvhub_cpu
>= MAX_CPUS_PER_UVHUB
) {
2045 printk(KERN_EMERG
"%d cpus per uvhub invalid\n",
2054 * Summarize the blade and socket topology into the per_cpu structures.
2056 static int __init
summarize_uvhub_sockets(int nuvhubs
,
2057 struct uvhub_desc
*uvhub_descs
,
2058 unsigned char *uvhub_mask
)
2062 unsigned short socket_mask
;
2064 for (uvhub
= 0; uvhub
< nuvhubs
; uvhub
++) {
2065 struct uvhub_desc
*bdp
;
2066 struct bau_control
*smaster
= NULL
;
2067 struct bau_control
*hmaster
= NULL
;
2069 if (!(*(uvhub_mask
+ (uvhub
/8)) & (1 << (uvhub
%8))))
2072 bdp
= &uvhub_descs
[uvhub
];
2073 socket_mask
= bdp
->socket_mask
;
2075 while (socket_mask
) {
2076 struct socket_desc
*sdp
;
2077 if ((socket_mask
& 1)) {
2078 sdp
= &bdp
->socket
[socket
];
2079 if (scan_sock(sdp
, bdp
, &smaster
, &hmaster
))
2081 make_per_cpu_thp(smaster
);
2084 socket_mask
= (socket_mask
>> 1);
2086 make_per_hub_cpumask(hmaster
);
2092 * initialize the bau_control structure for each cpu
2094 static int __init
init_per_cpu(int nuvhubs
, int base_part_pnode
)
2096 unsigned char *uvhub_mask
;
2098 struct uvhub_desc
*uvhub_descs
;
2100 timeout_us
= calculate_destination_timeout();
2102 vp
= kmalloc(nuvhubs
* sizeof(struct uvhub_desc
), GFP_KERNEL
);
2103 uvhub_descs
= (struct uvhub_desc
*)vp
;
2104 memset(uvhub_descs
, 0, nuvhubs
* sizeof(struct uvhub_desc
));
2105 uvhub_mask
= kzalloc((nuvhubs
+7)/8, GFP_KERNEL
);
2107 if (get_cpu_topology(base_part_pnode
, uvhub_descs
, uvhub_mask
))
2110 if (summarize_uvhub_sockets(nuvhubs
, uvhub_descs
, uvhub_mask
))
2115 init_per_cpu_tunables();
2125 * Initialization of BAU-related structures
2127 static int __init
uv_bau_init(void)
2135 cpumask_var_t
*mask
;
2137 if (!is_uv_system())
2140 for_each_possible_cpu(cur_cpu
) {
2141 mask
= &per_cpu(uv_flush_tlb_mask
, cur_cpu
);
2142 zalloc_cpumask_var_node(mask
, GFP_KERNEL
, cpu_to_node(cur_cpu
));
2145 nuvhubs
= uv_num_possible_blades();
2146 congested_cycles
= usec_2_cycles(congested_respns_us
);
2148 uv_base_pnode
= 0x7fffffff;
2149 for (uvhub
= 0; uvhub
< nuvhubs
; uvhub
++) {
2150 cpus
= uv_blade_nr_possible_cpus(uvhub
);
2151 if (cpus
&& (uv_blade_to_pnode(uvhub
) < uv_base_pnode
))
2152 uv_base_pnode
= uv_blade_to_pnode(uvhub
);
2157 if (init_per_cpu(nuvhubs
, uv_base_pnode
)) {
2163 vector
= UV_BAU_MESSAGE
;
2164 for_each_possible_blade(uvhub
) {
2165 if (uv_blade_nr_possible_cpus(uvhub
))
2166 init_uvhub(uvhub
, vector
, uv_base_pnode
);
2169 alloc_intr_gate(vector
, uv_bau_message_intr1
);
2171 for_each_possible_blade(uvhub
) {
2172 if (uv_blade_nr_possible_cpus(uvhub
)) {
2175 pnode
= uv_blade_to_pnode(uvhub
);
2178 write_gmmr_activation(pnode
, val
);
2179 mmr
= 1; /* should be 1 to broadcast to both sockets */
2181 write_mmr_data_broadcast(pnode
, mmr
);
2187 core_initcall(uv_bau_init
);
2188 fs_initcall(uv_ptc_init
);