aboutsummaryrefslogtreecommitdiffstats
path: root/arch/x86/kernel/tlb_uv.c
diff options
context:
space:
mode:
authorGlenn Elliott <gelliott@cs.unc.edu>2012-03-04 19:47:13 -0500
committerGlenn Elliott <gelliott@cs.unc.edu>2012-03-04 19:47:13 -0500
commitc71c03bda1e86c9d5198c5d83f712e695c4f2a1e (patch)
treeecb166cb3e2b7e2adb3b5e292245fefd23381ac8 /arch/x86/kernel/tlb_uv.c
parentea53c912f8a86a8567697115b6a0d8152beee5c8 (diff)
parent6a00f206debf8a5c8899055726ad127dbeeed098 (diff)
Merge branch 'mpi-master' into wip-k-fmlpwip-k-fmlp
Conflicts: litmus/sched_cedf.c
Diffstat (limited to 'arch/x86/kernel/tlb_uv.c')
-rw-r--r--arch/x86/kernel/tlb_uv.c1655
1 files changed, 0 insertions, 1655 deletions
diff --git a/arch/x86/kernel/tlb_uv.c b/arch/x86/kernel/tlb_uv.c
deleted file mode 100644
index 312ef0292815..000000000000
--- a/arch/x86/kernel/tlb_uv.c
+++ /dev/null
@@ -1,1655 +0,0 @@
1/*
2 * SGI UltraViolet TLB flush routines.
3 *
4 * (c) 2008-2010 Cliff Wickman <cpw@sgi.com>, SGI.
5 *
6 * This code is released under the GNU General Public License version 2 or
7 * later.
8 */
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
15#include <asm/mmu_context.h>
16#include <asm/uv/uv.h>
17#include <asm/uv/uv_mmrs.h>
18#include <asm/uv/uv_hub.h>
19#include <asm/uv/uv_bau.h>
20#include <asm/apic.h>
21#include <asm/idle.h>
22#include <asm/tsc.h>
23#include <asm/irq_vectors.h>
24#include <asm/timer.h>
25
26/* timeouts in nanoseconds (indexed by UVH_AGING_PRESCALE_SEL urgency7 30:28) */
27static int timeout_base_ns[] = {
28 20,
29 160,
30 1280,
31 10240,
32 81920,
33 655360,
34 5242880,
35 167772160
36};
37static int timeout_us;
38static int nobau;
39static int baudisabled;
40static spinlock_t disable_lock;
41static cycles_t congested_cycles;
42
43/* tunables: */
44static int max_bau_concurrent = MAX_BAU_CONCURRENT;
45static int max_bau_concurrent_constant = MAX_BAU_CONCURRENT;
46static int plugged_delay = PLUGGED_DELAY;
47static int plugsb4reset = PLUGSB4RESET;
48static int timeoutsb4reset = TIMEOUTSB4RESET;
49static int ipi_reset_limit = IPI_RESET_LIMIT;
50static int complete_threshold = COMPLETE_THRESHOLD;
51static int congested_response_us = CONGESTED_RESPONSE_US;
52static int congested_reps = CONGESTED_REPS;
53static int congested_period = CONGESTED_PERIOD;
54static struct dentry *tunables_dir;
55static struct dentry *tunables_file;
56
57static int __init setup_nobau(char *arg)
58{
59 nobau = 1;
60 return 0;
61}
62early_param("nobau", setup_nobau);
63
64/* base pnode in this partition */
65static int uv_partition_base_pnode __read_mostly;
66/* position of pnode (which is nasid>>1): */
67static int uv_nshift __read_mostly;
68static unsigned long uv_mmask __read_mostly;
69
70static DEFINE_PER_CPU(struct ptc_stats, ptcstats);
71static DEFINE_PER_CPU(struct bau_control, bau_control);
72static DEFINE_PER_CPU(cpumask_var_t, uv_flush_tlb_mask);
73
74/*
75 * Determine the first node on a uvhub. 'Nodes' are used for kernel
76 * memory allocation.
77 */
78static int __init uvhub_to_first_node(int uvhub)
79{
80 int node, b;
81
82 for_each_online_node(node) {
83 b = uv_node_to_blade_id(node);
84 if (uvhub == b)
85 return node;
86 }
87 return -1;
88}
89
90/*
91 * Determine the apicid of the first cpu on a uvhub.
92 */
93static int __init uvhub_to_first_apicid(int uvhub)
94{
95 int cpu;
96
97 for_each_present_cpu(cpu)
98 if (uvhub == uv_cpu_to_blade_id(cpu))
99 return per_cpu(x86_cpu_to_apicid, cpu);
100 return -1;
101}
102
103/*
104 * Free a software acknowledge hardware resource by clearing its Pending
105 * bit. This will return a reply to the sender.
106 * If the message has timed out, a reply has already been sent by the
107 * hardware but the resource has not been released. In that case our
108 * clear of the Timeout bit (as well) will free the resource. No reply will
109 * be sent (the hardware will only do one reply per message).
110 */
111static inline void uv_reply_to_message(struct msg_desc *mdp,
112 struct bau_control *bcp)
113{
114 unsigned long dw;
115 struct bau_payload_queue_entry *msg;
116
117 msg = mdp->msg;
118 if (!msg->canceled) {
119 dw = (msg->sw_ack_vector << UV_SW_ACK_NPENDING) |
120 msg->sw_ack_vector;
121 uv_write_local_mmr(
122 UVH_LB_BAU_INTD_SOFTWARE_ACKNOWLEDGE_ALIAS, dw);
123 }
124 msg->replied_to = 1;
125 msg->sw_ack_vector = 0;
126}
127
128/*
129 * Process the receipt of a RETRY message
130 */
131static inline void uv_bau_process_retry_msg(struct msg_desc *mdp,
132 struct bau_control *bcp)
133{
134 int i;
135 int cancel_count = 0;
136 int slot2;
137 unsigned long msg_res;
138 unsigned long mmr = 0;
139 struct bau_payload_queue_entry *msg;
140 struct bau_payload_queue_entry *msg2;
141 struct ptc_stats *stat;
142
143 msg = mdp->msg;
144 stat = bcp->statp;
145 stat->d_retries++;
146 /*
147 * cancel any message from msg+1 to the retry itself
148 */
149 for (msg2 = msg+1, i = 0; i < DEST_Q_SIZE; msg2++, i++) {
150 if (msg2 > mdp->va_queue_last)
151 msg2 = mdp->va_queue_first;
152 if (msg2 == msg)
153 break;
154
155 /* same conditions for cancellation as uv_do_reset */
156 if ((msg2->replied_to == 0) && (msg2->canceled == 0) &&
157 (msg2->sw_ack_vector) && ((msg2->sw_ack_vector &
158 msg->sw_ack_vector) == 0) &&
159 (msg2->sending_cpu == msg->sending_cpu) &&
160 (msg2->msg_type != MSG_NOOP)) {
161 slot2 = msg2 - mdp->va_queue_first;
162 mmr = uv_read_local_mmr
163 (UVH_LB_BAU_INTD_SOFTWARE_ACKNOWLEDGE);
164 msg_res = msg2->sw_ack_vector;
165 /*
166 * This is a message retry; clear the resources held
167 * by the previous message only if they timed out.
168 * If it has not timed out we have an unexpected
169 * situation to report.
170 */
171 if (mmr & (msg_res << UV_SW_ACK_NPENDING)) {
172 /*
173 * is the resource timed out?
174 * make everyone ignore the cancelled message.
175 */
176 msg2->canceled = 1;
177 stat->d_canceled++;
178 cancel_count++;
179 uv_write_local_mmr(
180 UVH_LB_BAU_INTD_SOFTWARE_ACKNOWLEDGE_ALIAS,
181 (msg_res << UV_SW_ACK_NPENDING) |
182 msg_res);
183 }
184 }
185 }
186 if (!cancel_count)
187 stat->d_nocanceled++;
188}
189
190/*
191 * Do all the things a cpu should do for a TLB shootdown message.
192 * Other cpu's may come here at the same time for this message.
193 */
194static void uv_bau_process_message(struct msg_desc *mdp,
195 struct bau_control *bcp)
196{
197 int msg_ack_count;
198 short socket_ack_count = 0;
199 struct ptc_stats *stat;
200 struct bau_payload_queue_entry *msg;
201 struct bau_control *smaster = bcp->socket_master;
202
203 /*
204 * This must be a normal message, or retry of a normal message
205 */
206 msg = mdp->msg;
207 stat = bcp->statp;
208 if (msg->address == TLB_FLUSH_ALL) {
209 local_flush_tlb();
210 stat->d_alltlb++;
211 } else {
212 __flush_tlb_one(msg->address);
213 stat->d_onetlb++;
214 }
215 stat->d_requestee++;
216
217 /*
218 * One cpu on each uvhub has the additional job on a RETRY
219 * of releasing the resource held by the message that is
220 * being retried. That message is identified by sending
221 * cpu number.
222 */
223 if (msg->msg_type == MSG_RETRY && bcp == bcp->uvhub_master)
224 uv_bau_process_retry_msg(mdp, bcp);
225
226 /*
227 * This is a sw_ack message, so we have to reply to it.
228 * Count each responding cpu on the socket. This avoids
229 * pinging the count's cache line back and forth between
230 * the sockets.
231 */
232 socket_ack_count = atomic_add_short_return(1, (struct atomic_short *)
233 &smaster->socket_acknowledge_count[mdp->msg_slot]);
234 if (socket_ack_count == bcp->cpus_in_socket) {
235 /*
236 * Both sockets dump their completed count total into
237 * the message's count.
238 */
239 smaster->socket_acknowledge_count[mdp->msg_slot] = 0;
240 msg_ack_count = atomic_add_short_return(socket_ack_count,
241 (struct atomic_short *)&msg->acknowledge_count);
242
243 if (msg_ack_count == bcp->cpus_in_uvhub) {
244 /*
245 * All cpus in uvhub saw it; reply
246 */
247 uv_reply_to_message(mdp, bcp);
248 }
249 }
250
251 return;
252}
253
254/*
255 * Determine the first cpu on a uvhub.
256 */
257static int uvhub_to_first_cpu(int uvhub)
258{
259 int cpu;
260 for_each_present_cpu(cpu)
261 if (uvhub == uv_cpu_to_blade_id(cpu))
262 return cpu;
263 return -1;
264}
265
266/*
267 * Last resort when we get a large number of destination timeouts is
268 * to clear resources held by a given cpu.
269 * Do this with IPI so that all messages in the BAU message queue
270 * can be identified by their nonzero sw_ack_vector field.
271 *
272 * This is entered for a single cpu on the uvhub.
273 * The sender want's this uvhub to free a specific message's
274 * sw_ack resources.
275 */
276static void
277uv_do_reset(void *ptr)
278{
279 int i;
280 int slot;
281 int count = 0;
282 unsigned long mmr;
283 unsigned long msg_res;
284 struct bau_control *bcp;
285 struct reset_args *rap;
286 struct bau_payload_queue_entry *msg;
287 struct ptc_stats *stat;
288
289 bcp = &per_cpu(bau_control, smp_processor_id());
290 rap = (struct reset_args *)ptr;
291 stat = bcp->statp;
292 stat->d_resets++;
293
294 /*
295 * We're looking for the given sender, and
296 * will free its sw_ack resource.
297 * If all cpu's finally responded after the timeout, its
298 * message 'replied_to' was set.
299 */
300 for (msg = bcp->va_queue_first, i = 0; i < DEST_Q_SIZE; msg++, i++) {
301 /* uv_do_reset: same conditions for cancellation as
302 uv_bau_process_retry_msg() */
303 if ((msg->replied_to == 0) &&
304 (msg->canceled == 0) &&
305 (msg->sending_cpu == rap->sender) &&
306 (msg->sw_ack_vector) &&
307 (msg->msg_type != MSG_NOOP)) {
308 /*
309 * make everyone else ignore this message
310 */
311 msg->canceled = 1;
312 slot = msg - bcp->va_queue_first;
313 count++;
314 /*
315 * only reset the resource if it is still pending
316 */
317 mmr = uv_read_local_mmr
318 (UVH_LB_BAU_INTD_SOFTWARE_ACKNOWLEDGE);
319 msg_res = msg->sw_ack_vector;
320 if (mmr & msg_res) {
321 stat->d_rcanceled++;
322 uv_write_local_mmr(
323 UVH_LB_BAU_INTD_SOFTWARE_ACKNOWLEDGE_ALIAS,
324 (msg_res << UV_SW_ACK_NPENDING) |
325 msg_res);
326 }
327 }
328 }
329 return;
330}
331
332/*
333 * Use IPI to get all target uvhubs to release resources held by
334 * a given sending cpu number.
335 */
336static void uv_reset_with_ipi(struct bau_target_uvhubmask *distribution,
337 int sender)
338{
339 int uvhub;
340 int cpu;
341 cpumask_t mask;
342 struct reset_args reset_args;
343
344 reset_args.sender = sender;
345
346 cpus_clear(mask);
347 /* find a single cpu for each uvhub in this distribution mask */
348 for (uvhub = 0;
349 uvhub < sizeof(struct bau_target_uvhubmask) * BITSPERBYTE;
350 uvhub++) {
351 if (!bau_uvhub_isset(uvhub, distribution))
352 continue;
353 /* find a cpu for this uvhub */
354 cpu = uvhub_to_first_cpu(uvhub);
355 cpu_set(cpu, mask);
356 }
357 /* IPI all cpus; Preemption is already disabled */
358 smp_call_function_many(&mask, uv_do_reset, (void *)&reset_args, 1);
359 return;
360}
361
362static inline unsigned long
363cycles_2_us(unsigned long long cyc)
364{
365 unsigned long long ns;
366 unsigned long us;
367 ns = (cyc * per_cpu(cyc2ns, smp_processor_id()))
368 >> CYC2NS_SCALE_FACTOR;
369 us = ns / 1000;
370 return us;
371}
372
373/*
374 * wait for all cpus on this hub to finish their sends and go quiet
375 * leaves uvhub_quiesce set so that no new broadcasts are started by
376 * bau_flush_send_and_wait()
377 */
378static inline void
379quiesce_local_uvhub(struct bau_control *hmaster)
380{
381 atomic_add_short_return(1, (struct atomic_short *)
382 &hmaster->uvhub_quiesce);
383}
384
385/*
386 * mark this quiet-requestor as done
387 */
388static inline void
389end_uvhub_quiesce(struct bau_control *hmaster)
390{
391 atomic_add_short_return(-1, (struct atomic_short *)
392 &hmaster->uvhub_quiesce);
393}
394
395/*
396 * Wait for completion of a broadcast software ack message
397 * return COMPLETE, RETRY(PLUGGED or TIMEOUT) or GIVEUP
398 */
399static int uv_wait_completion(struct bau_desc *bau_desc,
400 unsigned long mmr_offset, int right_shift, int this_cpu,
401 struct bau_control *bcp, struct bau_control *smaster, long try)
402{
403 unsigned long descriptor_status;
404 cycles_t ttime;
405 struct ptc_stats *stat = bcp->statp;
406 struct bau_control *hmaster;
407
408 hmaster = bcp->uvhub_master;
409
410 /* spin on the status MMR, waiting for it to go idle */
411 while ((descriptor_status = (((unsigned long)
412 uv_read_local_mmr(mmr_offset) >>
413 right_shift) & UV_ACT_STATUS_MASK)) !=
414 DESC_STATUS_IDLE) {
415 /*
416 * Our software ack messages may be blocked because there are
417 * no swack resources available. As long as none of them
418 * has timed out hardware will NACK our message and its
419 * state will stay IDLE.
420 */
421 if (descriptor_status == DESC_STATUS_SOURCE_TIMEOUT) {
422 stat->s_stimeout++;
423 return FLUSH_GIVEUP;
424 } else if (descriptor_status ==
425 DESC_STATUS_DESTINATION_TIMEOUT) {
426 stat->s_dtimeout++;
427 ttime = get_cycles();
428
429 /*
430 * Our retries may be blocked by all destination
431 * swack resources being consumed, and a timeout
432 * pending. In that case hardware returns the
433 * ERROR that looks like a destination timeout.
434 */
435 if (cycles_2_us(ttime - bcp->send_message) <
436 timeout_us) {
437 bcp->conseccompletes = 0;
438 return FLUSH_RETRY_PLUGGED;
439 }
440
441 bcp->conseccompletes = 0;
442 return FLUSH_RETRY_TIMEOUT;
443 } else {
444 /*
445 * descriptor_status is still BUSY
446 */
447 cpu_relax();
448 }
449 }
450 bcp->conseccompletes++;
451 return FLUSH_COMPLETE;
452}
453
454static inline cycles_t
455sec_2_cycles(unsigned long sec)
456{
457 unsigned long ns;
458 cycles_t cyc;
459
460 ns = sec * 1000000000;
461 cyc = (ns << CYC2NS_SCALE_FACTOR)/(per_cpu(cyc2ns, smp_processor_id()));
462 return cyc;
463}
464
465/*
466 * conditionally add 1 to *v, unless *v is >= u
467 * return 0 if we cannot add 1 to *v because it is >= u
468 * return 1 if we can add 1 to *v because it is < u
469 * the add is atomic
470 *
471 * This is close to atomic_add_unless(), but this allows the 'u' value
472 * to be lowered below the current 'v'. atomic_add_unless can only stop
473 * on equal.
474 */
475static inline int atomic_inc_unless_ge(spinlock_t *lock, atomic_t *v, int u)
476{
477 spin_lock(lock);
478 if (atomic_read(v) >= u) {
479 spin_unlock(lock);
480 return 0;
481 }
482 atomic_inc(v);
483 spin_unlock(lock);
484 return 1;
485}
486
487/*
488 * Our retries are blocked by all destination swack resources being
489 * in use, and a timeout is pending. In that case hardware immediately
490 * returns the ERROR that looks like a destination timeout.
491 */
492static void
493destination_plugged(struct bau_desc *bau_desc, struct bau_control *bcp,
494 struct bau_control *hmaster, struct ptc_stats *stat)
495{
496 udelay(bcp->plugged_delay);
497 bcp->plugged_tries++;
498 if (bcp->plugged_tries >= bcp->plugsb4reset) {
499 bcp->plugged_tries = 0;
500 quiesce_local_uvhub(hmaster);
501 spin_lock(&hmaster->queue_lock);
502 uv_reset_with_ipi(&bau_desc->distribution, bcp->cpu);
503 spin_unlock(&hmaster->queue_lock);
504 end_uvhub_quiesce(hmaster);
505 bcp->ipi_attempts++;
506 stat->s_resets_plug++;
507 }
508}
509
510static void
511destination_timeout(struct bau_desc *bau_desc, struct bau_control *bcp,
512 struct bau_control *hmaster, struct ptc_stats *stat)
513{
514 hmaster->max_bau_concurrent = 1;
515 bcp->timeout_tries++;
516 if (bcp->timeout_tries >= bcp->timeoutsb4reset) {
517 bcp->timeout_tries = 0;
518 quiesce_local_uvhub(hmaster);
519 spin_lock(&hmaster->queue_lock);
520 uv_reset_with_ipi(&bau_desc->distribution, bcp->cpu);
521 spin_unlock(&hmaster->queue_lock);
522 end_uvhub_quiesce(hmaster);
523 bcp->ipi_attempts++;
524 stat->s_resets_timeout++;
525 }
526}
527
528/*
529 * Completions are taking a very long time due to a congested numalink
530 * network.
531 */
532static void
533disable_for_congestion(struct bau_control *bcp, struct ptc_stats *stat)
534{
535 int tcpu;
536 struct bau_control *tbcp;
537
538 /* let only one cpu do this disabling */
539 spin_lock(&disable_lock);
540 if (!baudisabled && bcp->period_requests &&
541 ((bcp->period_time / bcp->period_requests) > congested_cycles)) {
542 /* it becomes this cpu's job to turn on the use of the
543 BAU again */
544 baudisabled = 1;
545 bcp->set_bau_off = 1;
546 bcp->set_bau_on_time = get_cycles() +
547 sec_2_cycles(bcp->congested_period);
548 stat->s_bau_disabled++;
549 for_each_present_cpu(tcpu) {
550 tbcp = &per_cpu(bau_control, tcpu);
551 tbcp->baudisabled = 1;
552 }
553 }
554 spin_unlock(&disable_lock);
555}
556
557/**
558 * uv_flush_send_and_wait
559 *
560 * Send a broadcast and wait for it to complete.
561 *
562 * The flush_mask contains the cpus the broadcast is to be sent to including
563 * cpus that are on the local uvhub.
564 *
565 * Returns 0 if all flushing represented in the mask was done.
566 * Returns 1 if it gives up entirely and the original cpu mask is to be
567 * returned to the kernel.
568 */
569int uv_flush_send_and_wait(struct bau_desc *bau_desc,
570 struct cpumask *flush_mask, struct bau_control *bcp)
571{
572 int right_shift;
573 int completion_status = 0;
574 int seq_number = 0;
575 long try = 0;
576 int cpu = bcp->uvhub_cpu;
577 int this_cpu = bcp->cpu;
578 unsigned long mmr_offset;
579 unsigned long index;
580 cycles_t time1;
581 cycles_t time2;
582 cycles_t elapsed;
583 struct ptc_stats *stat = bcp->statp;
584 struct bau_control *smaster = bcp->socket_master;
585 struct bau_control *hmaster = bcp->uvhub_master;
586
587 if (!atomic_inc_unless_ge(&hmaster->uvhub_lock,
588 &hmaster->active_descriptor_count,
589 hmaster->max_bau_concurrent)) {
590 stat->s_throttles++;
591 do {
592 cpu_relax();
593 } while (!atomic_inc_unless_ge(&hmaster->uvhub_lock,
594 &hmaster->active_descriptor_count,
595 hmaster->max_bau_concurrent));
596 }
597 while (hmaster->uvhub_quiesce)
598 cpu_relax();
599
600 if (cpu < UV_CPUS_PER_ACT_STATUS) {
601 mmr_offset = UVH_LB_BAU_SB_ACTIVATION_STATUS_0;
602 right_shift = cpu * UV_ACT_STATUS_SIZE;
603 } else {
604 mmr_offset = UVH_LB_BAU_SB_ACTIVATION_STATUS_1;
605 right_shift =
606 ((cpu - UV_CPUS_PER_ACT_STATUS) * UV_ACT_STATUS_SIZE);
607 }
608 time1 = get_cycles();
609 do {
610 if (try == 0) {
611 bau_desc->header.msg_type = MSG_REGULAR;
612 seq_number = bcp->message_number++;
613 } else {
614 bau_desc->header.msg_type = MSG_RETRY;
615 stat->s_retry_messages++;
616 }
617 bau_desc->header.sequence = seq_number;
618 index = (1UL << UVH_LB_BAU_SB_ACTIVATION_CONTROL_PUSH_SHFT) |
619 bcp->uvhub_cpu;
620 bcp->send_message = get_cycles();
621 uv_write_local_mmr(UVH_LB_BAU_SB_ACTIVATION_CONTROL, index);
622 try++;
623 completion_status = uv_wait_completion(bau_desc, mmr_offset,
624 right_shift, this_cpu, bcp, smaster, try);
625
626 if (completion_status == FLUSH_RETRY_PLUGGED) {
627 destination_plugged(bau_desc, bcp, hmaster, stat);
628 } else if (completion_status == FLUSH_RETRY_TIMEOUT) {
629 destination_timeout(bau_desc, bcp, hmaster, stat);
630 }
631 if (bcp->ipi_attempts >= bcp->ipi_reset_limit) {
632 bcp->ipi_attempts = 0;
633 completion_status = FLUSH_GIVEUP;
634 break;
635 }
636 cpu_relax();
637 } while ((completion_status == FLUSH_RETRY_PLUGGED) ||
638 (completion_status == FLUSH_RETRY_TIMEOUT));
639 time2 = get_cycles();
640 bcp->plugged_tries = 0;
641 bcp->timeout_tries = 0;
642 if ((completion_status == FLUSH_COMPLETE) &&
643 (bcp->conseccompletes > bcp->complete_threshold) &&
644 (hmaster->max_bau_concurrent <
645 hmaster->max_bau_concurrent_constant))
646 hmaster->max_bau_concurrent++;
647 while (hmaster->uvhub_quiesce)
648 cpu_relax();
649 atomic_dec(&hmaster->active_descriptor_count);
650 if (time2 > time1) {
651 elapsed = time2 - time1;
652 stat->s_time += elapsed;
653 if ((completion_status == FLUSH_COMPLETE) && (try == 1)) {
654 bcp->period_requests++;
655 bcp->period_time += elapsed;
656 if ((elapsed > congested_cycles) &&
657 (bcp->period_requests > bcp->congested_reps)) {
658 disable_for_congestion(bcp, stat);
659 }
660 }
661 } else
662 stat->s_requestor--;
663 if (completion_status == FLUSH_COMPLETE && try > 1)
664 stat->s_retriesok++;
665 else if (completion_status == FLUSH_GIVEUP) {
666 stat->s_giveup++;
667 return 1;
668 }
669 return 0;
670}
671
672/**
673 * uv_flush_tlb_others - globally purge translation cache of a virtual
674 * address or all TLB's
675 * @cpumask: mask of all cpu's in which the address is to be removed
676 * @mm: mm_struct containing virtual address range
677 * @va: virtual address to be removed (or TLB_FLUSH_ALL for all TLB's on cpu)
678 * @cpu: the current cpu
679 *
680 * This is the entry point for initiating any UV global TLB shootdown.
681 *
682 * Purges the translation caches of all specified processors of the given
683 * virtual address, or purges all TLB's on specified processors.
684 *
685 * The caller has derived the cpumask from the mm_struct. This function
686 * is called only if there are bits set in the mask. (e.g. flush_tlb_page())
687 *
688 * The cpumask is converted into a uvhubmask of the uvhubs containing
689 * those cpus.
690 *
691 * Note that this function should be called with preemption disabled.
692 *
693 * Returns NULL if all remote flushing was done.
694 * Returns pointer to cpumask if some remote flushing remains to be
695 * done. The returned pointer is valid till preemption is re-enabled.
696 */
697const struct cpumask *uv_flush_tlb_others(const struct cpumask *cpumask,
698 struct mm_struct *mm,
699 unsigned long va, unsigned int cpu)
700{
701 int tcpu;
702 int uvhub;
703 int locals = 0;
704 int remotes = 0;
705 int hubs = 0;
706 struct bau_desc *bau_desc;
707 struct cpumask *flush_mask;
708 struct ptc_stats *stat;
709 struct bau_control *bcp;
710 struct bau_control *tbcp;
711
712 /* kernel was booted 'nobau' */
713 if (nobau)
714 return cpumask;
715
716 bcp = &per_cpu(bau_control, cpu);
717 stat = bcp->statp;
718
719 /* bau was disabled due to slow response */
720 if (bcp->baudisabled) {
721 /* the cpu that disabled it must re-enable it */
722 if (bcp->set_bau_off) {
723 if (get_cycles() >= bcp->set_bau_on_time) {
724 stat->s_bau_reenabled++;
725 baudisabled = 0;
726 for_each_present_cpu(tcpu) {
727 tbcp = &per_cpu(bau_control, tcpu);
728 tbcp->baudisabled = 0;
729 tbcp->period_requests = 0;
730 tbcp->period_time = 0;
731 }
732 }
733 }
734 return cpumask;
735 }
736
737 /*
738 * Each sending cpu has a per-cpu mask which it fills from the caller's
739 * cpu mask. All cpus are converted to uvhubs and copied to the
740 * activation descriptor.
741 */
742 flush_mask = (struct cpumask *)per_cpu(uv_flush_tlb_mask, cpu);
743 /* don't actually do a shootdown of the local cpu */
744 cpumask_andnot(flush_mask, cpumask, cpumask_of(cpu));
745 if (cpu_isset(cpu, *cpumask))
746 stat->s_ntargself++;
747
748 bau_desc = bcp->descriptor_base;
749 bau_desc += UV_ITEMS_PER_DESCRIPTOR * bcp->uvhub_cpu;
750 bau_uvhubs_clear(&bau_desc->distribution, UV_DISTRIBUTION_SIZE);
751
752 /* cpu statistics */
753 for_each_cpu(tcpu, flush_mask) {
754 uvhub = uv_cpu_to_blade_id(tcpu);
755 bau_uvhub_set(uvhub, &bau_desc->distribution);
756 if (uvhub == bcp->uvhub)
757 locals++;
758 else
759 remotes++;
760 }
761 if ((locals + remotes) == 0)
762 return NULL;
763 stat->s_requestor++;
764 stat->s_ntargcpu += remotes + locals;
765 stat->s_ntargremotes += remotes;
766 stat->s_ntarglocals += locals;
767 remotes = bau_uvhub_weight(&bau_desc->distribution);
768
769 /* uvhub statistics */
770 hubs = bau_uvhub_weight(&bau_desc->distribution);
771 if (locals) {
772 stat->s_ntarglocaluvhub++;
773 stat->s_ntargremoteuvhub += (hubs - 1);
774 } else
775 stat->s_ntargremoteuvhub += hubs;
776 stat->s_ntarguvhub += hubs;
777 if (hubs >= 16)
778 stat->s_ntarguvhub16++;
779 else if (hubs >= 8)
780 stat->s_ntarguvhub8++;
781 else if (hubs >= 4)
782 stat->s_ntarguvhub4++;
783 else if (hubs >= 2)
784 stat->s_ntarguvhub2++;
785 else
786 stat->s_ntarguvhub1++;
787
788 bau_desc->payload.address = va;
789 bau_desc->payload.sending_cpu = cpu;
790
791 /*
792 * uv_flush_send_and_wait returns 0 if all cpu's were messaged,
793 * or 1 if it gave up and the original cpumask should be returned.
794 */
795 if (!uv_flush_send_and_wait(bau_desc, flush_mask, bcp))
796 return NULL;
797 else
798 return cpumask;
799}
800
801/*
802 * The BAU message interrupt comes here. (registered by set_intr_gate)
803 * See entry_64.S
804 *
805 * We received a broadcast assist message.
806 *
807 * Interrupts are disabled; this interrupt could represent
808 * the receipt of several messages.
809 *
810 * All cores/threads on this hub get this interrupt.
811 * The last one to see it does the software ack.
812 * (the resource will not be freed until noninterruptable cpus see this
813 * interrupt; hardware may timeout the s/w ack and reply ERROR)
814 */
815void uv_bau_message_interrupt(struct pt_regs *regs)
816{
817 int count = 0;
818 cycles_t time_start;
819 struct bau_payload_queue_entry *msg;
820 struct bau_control *bcp;
821 struct ptc_stats *stat;
822 struct msg_desc msgdesc;
823
824 time_start = get_cycles();
825 bcp = &per_cpu(bau_control, smp_processor_id());
826 stat = bcp->statp;
827 msgdesc.va_queue_first = bcp->va_queue_first;
828 msgdesc.va_queue_last = bcp->va_queue_last;
829 msg = bcp->bau_msg_head;
830 while (msg->sw_ack_vector) {
831 count++;
832 msgdesc.msg_slot = msg - msgdesc.va_queue_first;
833 msgdesc.sw_ack_slot = ffs(msg->sw_ack_vector) - 1;
834 msgdesc.msg = msg;
835 uv_bau_process_message(&msgdesc, bcp);
836 msg++;
837 if (msg > msgdesc.va_queue_last)
838 msg = msgdesc.va_queue_first;
839 bcp->bau_msg_head = msg;
840 }
841 stat->d_time += (get_cycles() - time_start);
842 if (!count)
843 stat->d_nomsg++;
844 else if (count > 1)
845 stat->d_multmsg++;
846 ack_APIC_irq();
847}
848
849/*
850 * uv_enable_timeouts
851 *
852 * Each target uvhub (i.e. a uvhub that has no cpu's) needs to have
853 * shootdown message timeouts enabled. The timeout does not cause
854 * an interrupt, but causes an error message to be returned to
855 * the sender.
856 */
857static void uv_enable_timeouts(void)
858{
859 int uvhub;
860 int nuvhubs;
861 int pnode;
862 unsigned long mmr_image;
863
864 nuvhubs = uv_num_possible_blades();
865
866 for (uvhub = 0; uvhub < nuvhubs; uvhub++) {
867 if (!uv_blade_nr_possible_cpus(uvhub))
868 continue;
869
870 pnode = uv_blade_to_pnode(uvhub);
871 mmr_image =
872 uv_read_global_mmr64(pnode, UVH_LB_BAU_MISC_CONTROL);
873 /*
874 * Set the timeout period and then lock it in, in three
875 * steps; captures and locks in the period.
876 *
877 * To program the period, the SOFT_ACK_MODE must be off.
878 */
879 mmr_image &= ~((unsigned long)1 <<
880 UVH_LB_BAU_MISC_CONTROL_ENABLE_INTD_SOFT_ACK_MODE_SHFT);
881 uv_write_global_mmr64
882 (pnode, UVH_LB_BAU_MISC_CONTROL, mmr_image);
883 /*
884 * Set the 4-bit period.
885 */
886 mmr_image &= ~((unsigned long)0xf <<
887 UVH_LB_BAU_MISC_CONTROL_INTD_SOFT_ACK_TIMEOUT_PERIOD_SHFT);
888 mmr_image |= (UV_INTD_SOFT_ACK_TIMEOUT_PERIOD <<
889 UVH_LB_BAU_MISC_CONTROL_INTD_SOFT_ACK_TIMEOUT_PERIOD_SHFT);
890 uv_write_global_mmr64
891 (pnode, UVH_LB_BAU_MISC_CONTROL, mmr_image);
892 /*
893 * Subsequent reversals of the timebase bit (3) cause an
894 * immediate timeout of one or all INTD resources as
895 * indicated in bits 2:0 (7 causes all of them to timeout).
896 */
897 mmr_image |= ((unsigned long)1 <<
898 UVH_LB_BAU_MISC_CONTROL_ENABLE_INTD_SOFT_ACK_MODE_SHFT);
899 uv_write_global_mmr64
900 (pnode, UVH_LB_BAU_MISC_CONTROL, mmr_image);
901 }
902}
903
904static void *uv_ptc_seq_start(struct seq_file *file, loff_t *offset)
905{
906 if (*offset < num_possible_cpus())
907 return offset;
908 return NULL;
909}
910
911static void *uv_ptc_seq_next(struct seq_file *file, void *data, loff_t *offset)
912{
913 (*offset)++;
914 if (*offset < num_possible_cpus())
915 return offset;
916 return NULL;
917}
918
919static void uv_ptc_seq_stop(struct seq_file *file, void *data)
920{
921}
922
923static inline unsigned long long
924microsec_2_cycles(unsigned long microsec)
925{
926 unsigned long ns;
927 unsigned long long cyc;
928
929 ns = microsec * 1000;
930 cyc = (ns << CYC2NS_SCALE_FACTOR)/(per_cpu(cyc2ns, smp_processor_id()));
931 return cyc;
932}
933
934/*
935 * Display the statistics thru /proc.
936 * 'data' points to the cpu number
937 */
938static int uv_ptc_seq_show(struct seq_file *file, void *data)
939{
940 struct ptc_stats *stat;
941 int cpu;
942
943 cpu = *(loff_t *)data;
944
945 if (!cpu) {
946 seq_printf(file,
947 "# cpu sent stime self locals remotes ncpus localhub ");
948 seq_printf(file,
949 "remotehub numuvhubs numuvhubs16 numuvhubs8 ");
950 seq_printf(file,
951 "numuvhubs4 numuvhubs2 numuvhubs1 dto ");
952 seq_printf(file,
953 "retries rok resetp resett giveup sto bz throt ");
954 seq_printf(file,
955 "sw_ack recv rtime all ");
956 seq_printf(file,
957 "one mult none retry canc nocan reset rcan ");
958 seq_printf(file,
959 "disable enable\n");
960 }
961 if (cpu < num_possible_cpus() && cpu_online(cpu)) {
962 stat = &per_cpu(ptcstats, cpu);
963 /* source side statistics */
964 seq_printf(file,
965 "cpu %d %ld %ld %ld %ld %ld %ld %ld %ld %ld %ld ",
966 cpu, stat->s_requestor, cycles_2_us(stat->s_time),
967 stat->s_ntargself, stat->s_ntarglocals,
968 stat->s_ntargremotes, stat->s_ntargcpu,
969 stat->s_ntarglocaluvhub, stat->s_ntargremoteuvhub,
970 stat->s_ntarguvhub, stat->s_ntarguvhub16);
971 seq_printf(file, "%ld %ld %ld %ld %ld ",
972 stat->s_ntarguvhub8, stat->s_ntarguvhub4,
973 stat->s_ntarguvhub2, stat->s_ntarguvhub1,
974 stat->s_dtimeout);
975 seq_printf(file, "%ld %ld %ld %ld %ld %ld %ld %ld ",
976 stat->s_retry_messages, stat->s_retriesok,
977 stat->s_resets_plug, stat->s_resets_timeout,
978 stat->s_giveup, stat->s_stimeout,
979 stat->s_busy, stat->s_throttles);
980
981 /* destination side statistics */
982 seq_printf(file,
983 "%lx %ld %ld %ld %ld %ld %ld %ld %ld %ld %ld %ld ",
984 uv_read_global_mmr64(uv_cpu_to_pnode(cpu),
985 UVH_LB_BAU_INTD_SOFTWARE_ACKNOWLEDGE),
986 stat->d_requestee, cycles_2_us(stat->d_time),
987 stat->d_alltlb, stat->d_onetlb, stat->d_multmsg,
988 stat->d_nomsg, stat->d_retries, stat->d_canceled,
989 stat->d_nocanceled, stat->d_resets,
990 stat->d_rcanceled);
991 seq_printf(file, "%ld %ld\n",
992 stat->s_bau_disabled, stat->s_bau_reenabled);
993 }
994
995 return 0;
996}
997
998/*
999 * Display the tunables thru debugfs
1000 */
1001static ssize_t tunables_read(struct file *file, char __user *userbuf,
1002 size_t count, loff_t *ppos)
1003{
1004 char buf[300];
1005 int ret;
1006
1007 ret = snprintf(buf, 300, "%s %s %s\n%d %d %d %d %d %d %d %d %d\n",
1008 "max_bau_concurrent plugged_delay plugsb4reset",
1009 "timeoutsb4reset ipi_reset_limit complete_threshold",
1010 "congested_response_us congested_reps congested_period",
1011 max_bau_concurrent, plugged_delay, plugsb4reset,
1012 timeoutsb4reset, ipi_reset_limit, complete_threshold,
1013 congested_response_us, congested_reps, congested_period);
1014
1015 return simple_read_from_buffer(userbuf, count, ppos, buf, ret);
1016}
1017
1018/*
1019 * -1: resetf the statistics
1020 * 0: display meaning of the statistics
1021 */
1022static ssize_t uv_ptc_proc_write(struct file *file, const char __user *user,
1023 size_t count, loff_t *data)
1024{
1025 int cpu;
1026 long input_arg;
1027 char optstr[64];
1028 struct ptc_stats *stat;
1029
1030 if (count == 0 || count > sizeof(optstr))
1031 return -EINVAL;
1032 if (copy_from_user(optstr, user, count))
1033 return -EFAULT;
1034 optstr[count - 1] = '\0';
1035 if (strict_strtol(optstr, 10, &input_arg) < 0) {
1036 printk(KERN_DEBUG "%s is invalid\n", optstr);
1037 return -EINVAL;
1038 }
1039
1040 if (input_arg == 0) {
1041 printk(KERN_DEBUG "# cpu: cpu number\n");
1042 printk(KERN_DEBUG "Sender statistics:\n");
1043 printk(KERN_DEBUG
1044 "sent: number of shootdown messages sent\n");
1045 printk(KERN_DEBUG
1046 "stime: time spent sending messages\n");
1047 printk(KERN_DEBUG
1048 "numuvhubs: number of hubs targeted with shootdown\n");
1049 printk(KERN_DEBUG
1050 "numuvhubs16: number times 16 or more hubs targeted\n");
1051 printk(KERN_DEBUG
1052 "numuvhubs8: number times 8 or more hubs targeted\n");
1053 printk(KERN_DEBUG
1054 "numuvhubs4: number times 4 or more hubs targeted\n");
1055 printk(KERN_DEBUG
1056 "numuvhubs2: number times 2 or more hubs targeted\n");
1057 printk(KERN_DEBUG
1058 "numuvhubs1: number times 1 hub targeted\n");
1059 printk(KERN_DEBUG
1060 "numcpus: number of cpus targeted with shootdown\n");
1061 printk(KERN_DEBUG
1062 "dto: number of destination timeouts\n");
1063 printk(KERN_DEBUG
1064 "retries: destination timeout retries sent\n");
1065 printk(KERN_DEBUG
1066 "rok: : destination timeouts successfully retried\n");
1067 printk(KERN_DEBUG
1068 "resetp: ipi-style resource resets for plugs\n");
1069 printk(KERN_DEBUG
1070 "resett: ipi-style resource resets for timeouts\n");
1071 printk(KERN_DEBUG
1072 "giveup: fall-backs to ipi-style shootdowns\n");
1073 printk(KERN_DEBUG
1074 "sto: number of source timeouts\n");
1075 printk(KERN_DEBUG
1076 "bz: number of stay-busy's\n");
1077 printk(KERN_DEBUG
1078 "throt: number times spun in throttle\n");
1079 printk(KERN_DEBUG "Destination side statistics:\n");
1080 printk(KERN_DEBUG
1081 "sw_ack: image of UVH_LB_BAU_INTD_SOFTWARE_ACKNOWLEDGE\n");
1082 printk(KERN_DEBUG
1083 "recv: shootdown messages received\n");
1084 printk(KERN_DEBUG
1085 "rtime: time spent processing messages\n");
1086 printk(KERN_DEBUG
1087 "all: shootdown all-tlb messages\n");
1088 printk(KERN_DEBUG
1089 "one: shootdown one-tlb messages\n");
1090 printk(KERN_DEBUG
1091 "mult: interrupts that found multiple messages\n");
1092 printk(KERN_DEBUG
1093 "none: interrupts that found no messages\n");
1094 printk(KERN_DEBUG
1095 "retry: number of retry messages processed\n");
1096 printk(KERN_DEBUG
1097 "canc: number messages canceled by retries\n");
1098 printk(KERN_DEBUG
1099 "nocan: number retries that found nothing to cancel\n");
1100 printk(KERN_DEBUG
1101 "reset: number of ipi-style reset requests processed\n");
1102 printk(KERN_DEBUG
1103 "rcan: number messages canceled by reset requests\n");
1104 printk(KERN_DEBUG
1105 "disable: number times use of the BAU was disabled\n");
1106 printk(KERN_DEBUG
1107 "enable: number times use of the BAU was re-enabled\n");
1108 } else if (input_arg == -1) {
1109 for_each_present_cpu(cpu) {
1110 stat = &per_cpu(ptcstats, cpu);
1111 memset(stat, 0, sizeof(struct ptc_stats));
1112 }
1113 }
1114
1115 return count;
1116}
1117
1118static int local_atoi(const char *name)
1119{
1120 int val = 0;
1121
1122 for (;; name++) {
1123 switch (*name) {
1124 case '0' ... '9':
1125 val = 10*val+(*name-'0');
1126 break;
1127 default:
1128 return val;
1129 }
1130 }
1131}
1132
1133/*
1134 * set the tunables
1135 * 0 values reset them to defaults
1136 */
1137static ssize_t tunables_write(struct file *file, const char __user *user,
1138 size_t count, loff_t *data)
1139{
1140 int cpu;
1141 int cnt = 0;
1142 int val;
1143 char *p;
1144 char *q;
1145 char instr[64];
1146 struct bau_control *bcp;
1147
1148 if (count == 0 || count > sizeof(instr)-1)
1149 return -EINVAL;
1150 if (copy_from_user(instr, user, count))
1151 return -EFAULT;
1152
1153 instr[count] = '\0';
1154 /* count the fields */
1155 p = instr + strspn(instr, WHITESPACE);
1156 q = p;
1157 for (; *p; p = q + strspn(q, WHITESPACE)) {
1158 q = p + strcspn(p, WHITESPACE);
1159 cnt++;
1160 if (q == p)
1161 break;
1162 }
1163 if (cnt != 9) {
1164 printk(KERN_INFO "bau tunable error: should be 9 numbers\n");
1165 return -EINVAL;
1166 }
1167
1168 p = instr + strspn(instr, WHITESPACE);
1169 q = p;
1170 for (cnt = 0; *p; p = q + strspn(q, WHITESPACE), cnt++) {
1171 q = p + strcspn(p, WHITESPACE);
1172 val = local_atoi(p);
1173 switch (cnt) {
1174 case 0:
1175 if (val == 0) {
1176 max_bau_concurrent = MAX_BAU_CONCURRENT;
1177 max_bau_concurrent_constant =
1178 MAX_BAU_CONCURRENT;
1179 continue;
1180 }
1181 bcp = &per_cpu(bau_control, smp_processor_id());
1182 if (val < 1 || val > bcp->cpus_in_uvhub) {
1183 printk(KERN_DEBUG
1184 "Error: BAU max concurrent %d is invalid\n",
1185 val);
1186 return -EINVAL;
1187 }
1188 max_bau_concurrent = val;
1189 max_bau_concurrent_constant = val;
1190 continue;
1191 case 1:
1192 if (val == 0)
1193 plugged_delay = PLUGGED_DELAY;
1194 else
1195 plugged_delay = val;
1196 continue;
1197 case 2:
1198 if (val == 0)
1199 plugsb4reset = PLUGSB4RESET;
1200 else
1201 plugsb4reset = val;
1202 continue;
1203 case 3:
1204 if (val == 0)
1205 timeoutsb4reset = TIMEOUTSB4RESET;
1206 else
1207 timeoutsb4reset = val;
1208 continue;
1209 case 4:
1210 if (val == 0)
1211 ipi_reset_limit = IPI_RESET_LIMIT;
1212 else
1213 ipi_reset_limit = val;
1214 continue;
1215 case 5:
1216 if (val == 0)
1217 complete_threshold = COMPLETE_THRESHOLD;
1218 else
1219 complete_threshold = val;
1220 continue;
1221 case 6:
1222 if (val == 0)
1223 congested_response_us = CONGESTED_RESPONSE_US;
1224 else
1225 congested_response_us = val;
1226 continue;
1227 case 7:
1228 if (val == 0)
1229 congested_reps = CONGESTED_REPS;
1230 else
1231 congested_reps = val;
1232 continue;
1233 case 8:
1234 if (val == 0)
1235 congested_period = CONGESTED_PERIOD;
1236 else
1237 congested_period = val;
1238 continue;
1239 }
1240 if (q == p)
1241 break;
1242 }
1243 for_each_present_cpu(cpu) {
1244 bcp = &per_cpu(bau_control, cpu);
1245 bcp->max_bau_concurrent = max_bau_concurrent;
1246 bcp->max_bau_concurrent_constant = max_bau_concurrent;
1247 bcp->plugged_delay = plugged_delay;
1248 bcp->plugsb4reset = plugsb4reset;
1249 bcp->timeoutsb4reset = timeoutsb4reset;
1250 bcp->ipi_reset_limit = ipi_reset_limit;
1251 bcp->complete_threshold = complete_threshold;
1252 bcp->congested_response_us = congested_response_us;
1253 bcp->congested_reps = congested_reps;
1254 bcp->congested_period = congested_period;
1255 }
1256 return count;
1257}
1258
1259static const struct seq_operations uv_ptc_seq_ops = {
1260 .start = uv_ptc_seq_start,
1261 .next = uv_ptc_seq_next,
1262 .stop = uv_ptc_seq_stop,
1263 .show = uv_ptc_seq_show
1264};
1265
1266static int uv_ptc_proc_open(struct inode *inode, struct file *file)
1267{
1268 return seq_open(file, &uv_ptc_seq_ops);
1269}
1270
1271static int tunables_open(struct inode *inode, struct file *file)
1272{
1273 return 0;
1274}
1275
1276static const struct file_operations proc_uv_ptc_operations = {
1277 .open = uv_ptc_proc_open,
1278 .read = seq_read,
1279 .write = uv_ptc_proc_write,
1280 .llseek = seq_lseek,
1281 .release = seq_release,
1282};
1283
1284static const struct file_operations tunables_fops = {
1285 .open = tunables_open,
1286 .read = tunables_read,
1287 .write = tunables_write,
1288};
1289
1290static int __init uv_ptc_init(void)
1291{
1292 struct proc_dir_entry *proc_uv_ptc;
1293
1294 if (!is_uv_system())
1295 return 0;
1296
1297 proc_uv_ptc = proc_create(UV_PTC_BASENAME, 0444, NULL,
1298 &proc_uv_ptc_operations);
1299 if (!proc_uv_ptc) {
1300 printk(KERN_ERR "unable to create %s proc entry\n",
1301 UV_PTC_BASENAME);
1302 return -EINVAL;
1303 }
1304
1305 tunables_dir = debugfs_create_dir(UV_BAU_TUNABLES_DIR, NULL);
1306 if (!tunables_dir) {
1307 printk(KERN_ERR "unable to create debugfs directory %s\n",
1308 UV_BAU_TUNABLES_DIR);
1309 return -EINVAL;
1310 }
1311 tunables_file = debugfs_create_file(UV_BAU_TUNABLES_FILE, 0600,
1312 tunables_dir, NULL, &tunables_fops);
1313 if (!tunables_file) {
1314 printk(KERN_ERR "unable to create debugfs file %s\n",
1315 UV_BAU_TUNABLES_FILE);
1316 return -EINVAL;
1317 }
1318 return 0;
1319}
1320
1321/*
1322 * initialize the sending side's sending buffers
1323 */
1324static void
1325uv_activation_descriptor_init(int node, int pnode)
1326{
1327 int i;
1328 int cpu;
1329 unsigned long pa;
1330 unsigned long m;
1331 unsigned long n;
1332 struct bau_desc *bau_desc;
1333 struct bau_desc *bd2;
1334 struct bau_control *bcp;
1335
1336 /*
1337 * each bau_desc is 64 bytes; there are 8 (UV_ITEMS_PER_DESCRIPTOR)
1338 * per cpu; and up to 32 (UV_ADP_SIZE) cpu's per uvhub
1339 */
1340 bau_desc = (struct bau_desc *)kmalloc_node(sizeof(struct bau_desc)*
1341 UV_ADP_SIZE*UV_ITEMS_PER_DESCRIPTOR, GFP_KERNEL, node);
1342 BUG_ON(!bau_desc);
1343
1344 pa = uv_gpa(bau_desc); /* need the real nasid*/
1345 n = pa >> uv_nshift;
1346 m = pa & uv_mmask;
1347
1348 uv_write_global_mmr64(pnode, UVH_LB_BAU_SB_DESCRIPTOR_BASE,
1349 (n << UV_DESC_BASE_PNODE_SHIFT | m));
1350
1351 /*
1352 * initializing all 8 (UV_ITEMS_PER_DESCRIPTOR) descriptors for each
1353 * cpu even though we only use the first one; one descriptor can
1354 * describe a broadcast to 256 uv hubs.
1355 */
1356 for (i = 0, bd2 = bau_desc; i < (UV_ADP_SIZE*UV_ITEMS_PER_DESCRIPTOR);
1357 i++, bd2++) {
1358 memset(bd2, 0, sizeof(struct bau_desc));
1359 bd2->header.sw_ack_flag = 1;
1360 /*
1361 * base_dest_nodeid is the nasid (pnode<<1) of the first uvhub
1362 * in the partition. The bit map will indicate uvhub numbers,
1363 * which are 0-N in a partition. Pnodes are unique system-wide.
1364 */
1365 bd2->header.base_dest_nodeid = uv_partition_base_pnode << 1;
1366 bd2->header.dest_subnodeid = 0x10; /* the LB */
1367 bd2->header.command = UV_NET_ENDPOINT_INTD;
1368 bd2->header.int_both = 1;
1369 /*
1370 * all others need to be set to zero:
1371 * fairness chaining multilevel count replied_to
1372 */
1373 }
1374 for_each_present_cpu(cpu) {
1375 if (pnode != uv_blade_to_pnode(uv_cpu_to_blade_id(cpu)))
1376 continue;
1377 bcp = &per_cpu(bau_control, cpu);
1378 bcp->descriptor_base = bau_desc;
1379 }
1380}
1381
1382/*
1383 * initialize the destination side's receiving buffers
1384 * entered for each uvhub in the partition
1385 * - node is first node (kernel memory notion) on the uvhub
1386 * - pnode is the uvhub's physical identifier
1387 */
1388static void
1389uv_payload_queue_init(int node, int pnode)
1390{
1391 int pn;
1392 int cpu;
1393 char *cp;
1394 unsigned long pa;
1395 struct bau_payload_queue_entry *pqp;
1396 struct bau_payload_queue_entry *pqp_malloc;
1397 struct bau_control *bcp;
1398
1399 pqp = (struct bau_payload_queue_entry *) kmalloc_node(
1400 (DEST_Q_SIZE + 1) * sizeof(struct bau_payload_queue_entry),
1401 GFP_KERNEL, node);
1402 BUG_ON(!pqp);
1403 pqp_malloc = pqp;
1404
1405 cp = (char *)pqp + 31;
1406 pqp = (struct bau_payload_queue_entry *)(((unsigned long)cp >> 5) << 5);
1407
1408 for_each_present_cpu(cpu) {
1409 if (pnode != uv_cpu_to_pnode(cpu))
1410 continue;
1411 /* for every cpu on this pnode: */
1412 bcp = &per_cpu(bau_control, cpu);
1413 bcp->va_queue_first = pqp;
1414 bcp->bau_msg_head = pqp;
1415 bcp->va_queue_last = pqp + (DEST_Q_SIZE - 1);
1416 }
1417 /*
1418 * need the pnode of where the memory was really allocated
1419 */
1420 pa = uv_gpa(pqp);
1421 pn = pa >> uv_nshift;
1422 uv_write_global_mmr64(pnode,
1423 UVH_LB_BAU_INTD_PAYLOAD_QUEUE_FIRST,
1424 ((unsigned long)pn << UV_PAYLOADQ_PNODE_SHIFT) |
1425 uv_physnodeaddr(pqp));
1426 uv_write_global_mmr64(pnode, UVH_LB_BAU_INTD_PAYLOAD_QUEUE_TAIL,
1427 uv_physnodeaddr(pqp));
1428 uv_write_global_mmr64(pnode, UVH_LB_BAU_INTD_PAYLOAD_QUEUE_LAST,
1429 (unsigned long)
1430 uv_physnodeaddr(pqp + (DEST_Q_SIZE - 1)));
1431 /* in effect, all msg_type's are set to MSG_NOOP */
1432 memset(pqp, 0, sizeof(struct bau_payload_queue_entry) * DEST_Q_SIZE);
1433}
1434
1435/*
1436 * Initialization of each UV hub's structures
1437 */
1438static void __init uv_init_uvhub(int uvhub, int vector)
1439{
1440 int node;
1441 int pnode;
1442 unsigned long apicid;
1443
1444 node = uvhub_to_first_node(uvhub);
1445 pnode = uv_blade_to_pnode(uvhub);
1446 uv_activation_descriptor_init(node, pnode);
1447 uv_payload_queue_init(node, pnode);
1448 /*
1449 * the below initialization can't be in firmware because the
1450 * messaging IRQ will be determined by the OS
1451 */
1452 apicid = uvhub_to_first_apicid(uvhub);
1453 uv_write_global_mmr64(pnode, UVH_BAU_DATA_CONFIG,
1454 ((apicid << 32) | vector));
1455}
1456
1457/*
1458 * We will set BAU_MISC_CONTROL with a timeout period.
1459 * But the BIOS has set UVH_AGING_PRESCALE_SEL and UVH_TRANSACTION_TIMEOUT.
1460 * So the destination timeout period has be be calculated from them.
1461 */
1462static int
1463calculate_destination_timeout(void)
1464{
1465 unsigned long mmr_image;
1466 int mult1;
1467 int mult2;
1468 int index;
1469 int base;
1470 int ret;
1471 unsigned long ts_ns;
1472
1473 mult1 = UV_INTD_SOFT_ACK_TIMEOUT_PERIOD & BAU_MISC_CONTROL_MULT_MASK;
1474 mmr_image = uv_read_local_mmr(UVH_AGING_PRESCALE_SEL);
1475 index = (mmr_image >> BAU_URGENCY_7_SHIFT) & BAU_URGENCY_7_MASK;
1476 mmr_image = uv_read_local_mmr(UVH_TRANSACTION_TIMEOUT);
1477 mult2 = (mmr_image >> BAU_TRANS_SHIFT) & BAU_TRANS_MASK;
1478 base = timeout_base_ns[index];
1479 ts_ns = base * mult1 * mult2;
1480 ret = ts_ns / 1000;
1481 return ret;
1482}
1483
1484/*
1485 * initialize the bau_control structure for each cpu
1486 */
1487static void __init uv_init_per_cpu(int nuvhubs)
1488{
1489 int i;
1490 int cpu;
1491 int pnode;
1492 int uvhub;
1493 int have_hmaster;
1494 short socket = 0;
1495 unsigned short socket_mask;
1496 unsigned char *uvhub_mask;
1497 struct bau_control *bcp;
1498 struct uvhub_desc *bdp;
1499 struct socket_desc *sdp;
1500 struct bau_control *hmaster = NULL;
1501 struct bau_control *smaster = NULL;
1502 struct socket_desc {
1503 short num_cpus;
1504 short cpu_number[16];
1505 };
1506 struct uvhub_desc {
1507 unsigned short socket_mask;
1508 short num_cpus;
1509 short uvhub;
1510 short pnode;
1511 struct socket_desc socket[2];
1512 };
1513 struct uvhub_desc *uvhub_descs;
1514
1515 timeout_us = calculate_destination_timeout();
1516
1517 uvhub_descs = (struct uvhub_desc *)
1518 kmalloc(nuvhubs * sizeof(struct uvhub_desc), GFP_KERNEL);
1519 memset(uvhub_descs, 0, nuvhubs * sizeof(struct uvhub_desc));
1520 uvhub_mask = kzalloc((nuvhubs+7)/8, GFP_KERNEL);
1521 for_each_present_cpu(cpu) {
1522 bcp = &per_cpu(bau_control, cpu);
1523 memset(bcp, 0, sizeof(struct bau_control));
1524 pnode = uv_cpu_hub_info(cpu)->pnode;
1525 uvhub = uv_cpu_hub_info(cpu)->numa_blade_id;
1526 *(uvhub_mask + (uvhub/8)) |= (1 << (uvhub%8));
1527 bdp = &uvhub_descs[uvhub];
1528 bdp->num_cpus++;
1529 bdp->uvhub = uvhub;
1530 bdp->pnode = pnode;
1531 /* kludge: 'assuming' one node per socket, and assuming that
1532 disabling a socket just leaves a gap in node numbers */
1533 socket = (cpu_to_node(cpu) & 1);
1534 bdp->socket_mask |= (1 << socket);
1535 sdp = &bdp->socket[socket];
1536 sdp->cpu_number[sdp->num_cpus] = cpu;
1537 sdp->num_cpus++;
1538 }
1539 for (uvhub = 0; uvhub < nuvhubs; uvhub++) {
1540 if (!(*(uvhub_mask + (uvhub/8)) & (1 << (uvhub%8))))
1541 continue;
1542 have_hmaster = 0;
1543 bdp = &uvhub_descs[uvhub];
1544 socket_mask = bdp->socket_mask;
1545 socket = 0;
1546 while (socket_mask) {
1547 if (!(socket_mask & 1))
1548 goto nextsocket;
1549 sdp = &bdp->socket[socket];
1550 for (i = 0; i < sdp->num_cpus; i++) {
1551 cpu = sdp->cpu_number[i];
1552 bcp = &per_cpu(bau_control, cpu);
1553 bcp->cpu = cpu;
1554 if (i == 0) {
1555 smaster = bcp;
1556 if (!have_hmaster) {
1557 have_hmaster++;
1558 hmaster = bcp;
1559 }
1560 }
1561 bcp->cpus_in_uvhub = bdp->num_cpus;
1562 bcp->cpus_in_socket = sdp->num_cpus;
1563 bcp->socket_master = smaster;
1564 bcp->uvhub = bdp->uvhub;
1565 bcp->uvhub_master = hmaster;
1566 bcp->uvhub_cpu = uv_cpu_hub_info(cpu)->
1567 blade_processor_id;
1568 }
1569nextsocket:
1570 socket++;
1571 socket_mask = (socket_mask >> 1);
1572 }
1573 }
1574 kfree(uvhub_descs);
1575 kfree(uvhub_mask);
1576 for_each_present_cpu(cpu) {
1577 bcp = &per_cpu(bau_control, cpu);
1578 bcp->baudisabled = 0;
1579 bcp->statp = &per_cpu(ptcstats, cpu);
1580 /* time interval to catch a hardware stay-busy bug */
1581 bcp->timeout_interval = microsec_2_cycles(2*timeout_us);
1582 bcp->max_bau_concurrent = max_bau_concurrent;
1583 bcp->max_bau_concurrent_constant = max_bau_concurrent;
1584 bcp->plugged_delay = plugged_delay;
1585 bcp->plugsb4reset = plugsb4reset;
1586 bcp->timeoutsb4reset = timeoutsb4reset;
1587 bcp->ipi_reset_limit = ipi_reset_limit;
1588 bcp->complete_threshold = complete_threshold;
1589 bcp->congested_response_us = congested_response_us;
1590 bcp->congested_reps = congested_reps;
1591 bcp->congested_period = congested_period;
1592 }
1593}
1594
1595/*
1596 * Initialization of BAU-related structures
1597 */
1598static int __init uv_bau_init(void)
1599{
1600 int uvhub;
1601 int pnode;
1602 int nuvhubs;
1603 int cur_cpu;
1604 int vector;
1605 unsigned long mmr;
1606
1607 if (!is_uv_system())
1608 return 0;
1609
1610 if (nobau)
1611 return 0;
1612
1613 for_each_possible_cpu(cur_cpu)
1614 zalloc_cpumask_var_node(&per_cpu(uv_flush_tlb_mask, cur_cpu),
1615 GFP_KERNEL, cpu_to_node(cur_cpu));
1616
1617 uv_nshift = uv_hub_info->m_val;
1618 uv_mmask = (1UL << uv_hub_info->m_val) - 1;
1619 nuvhubs = uv_num_possible_blades();
1620 spin_lock_init(&disable_lock);
1621 congested_cycles = microsec_2_cycles(congested_response_us);
1622
1623 uv_init_per_cpu(nuvhubs);
1624
1625 uv_partition_base_pnode = 0x7fffffff;
1626 for (uvhub = 0; uvhub < nuvhubs; uvhub++)
1627 if (uv_blade_nr_possible_cpus(uvhub) &&
1628 (uv_blade_to_pnode(uvhub) < uv_partition_base_pnode))
1629 uv_partition_base_pnode = uv_blade_to_pnode(uvhub);
1630
1631 vector = UV_BAU_MESSAGE;
1632 for_each_possible_blade(uvhub)
1633 if (uv_blade_nr_possible_cpus(uvhub))
1634 uv_init_uvhub(uvhub, vector);
1635
1636 uv_enable_timeouts();
1637 alloc_intr_gate(vector, uv_bau_message_intr1);
1638
1639 for_each_possible_blade(uvhub) {
1640 if (uv_blade_nr_possible_cpus(uvhub)) {
1641 pnode = uv_blade_to_pnode(uvhub);
1642 /* INIT the bau */
1643 uv_write_global_mmr64(pnode,
1644 UVH_LB_BAU_SB_ACTIVATION_CONTROL,
1645 ((unsigned long)1 << 63));
1646 mmr = 1; /* should be 1 to broadcast to both sockets */
1647 uv_write_global_mmr64(pnode, UVH_BAU_DATA_BROADCAST,
1648 mmr);
1649 }
1650 }
1651
1652 return 0;
1653}
1654core_initcall(uv_bau_init);
1655fs_initcall(uv_ptc_init);
generated by cgit v1.2.2 (git 2.25.0) at 2025-03-15 16:19:04 -0400