2 * SGI UltraViolet TLB flush routines.
4 * (c) 2008-2012 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
;
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"
110 setup_nobau(char *arg
)
115 early_param("nobau", setup_nobau
);
117 /* base pnode in this partition */
118 static int uv_base_pnode __read_mostly
;
120 static DEFINE_PER_CPU(struct ptc_stats
, ptcstats
);
121 static DEFINE_PER_CPU(struct bau_control
, bau_control
);
122 static DEFINE_PER_CPU(cpumask_var_t
, uv_flush_tlb_mask
);
128 struct bau_control
*bcp
;
131 pr_info("BAU not initialized; cannot be turned on\n");
135 for_each_present_cpu(cpu
) {
136 bcp
= &per_cpu(bau_control
, cpu
);
139 pr_info("BAU turned on\n");
147 struct bau_control
*bcp
;
150 for_each_present_cpu(cpu
) {
151 bcp
= &per_cpu(bau_control
, cpu
);
154 pr_info("BAU turned off\n");
159 * Determine the first node on a uvhub. 'Nodes' are used for kernel
162 static int __init
uvhub_to_first_node(int uvhub
)
166 for_each_online_node(node
) {
167 b
= uv_node_to_blade_id(node
);
175 * Determine the apicid of the first cpu on a uvhub.
177 static int __init
uvhub_to_first_apicid(int uvhub
)
181 for_each_present_cpu(cpu
)
182 if (uvhub
== uv_cpu_to_blade_id(cpu
))
183 return per_cpu(x86_cpu_to_apicid
, cpu
);
188 * Free a software acknowledge hardware resource by clearing its Pending
189 * bit. This will return a reply to the sender.
190 * If the message has timed out, a reply has already been sent by the
191 * hardware but the resource has not been released. In that case our
192 * clear of the Timeout bit (as well) will free the resource. No reply will
193 * be sent (the hardware will only do one reply per message).
195 static void reply_to_message(struct msg_desc
*mdp
, struct bau_control
*bcp
,
199 struct bau_pq_entry
*msg
;
202 if (!msg
->canceled
&& do_acknowledge
) {
203 dw
= (msg
->swack_vec
<< UV_SW_ACK_NPENDING
) | msg
->swack_vec
;
204 write_mmr_sw_ack(dw
);
211 * Process the receipt of a RETRY message
213 static void bau_process_retry_msg(struct msg_desc
*mdp
,
214 struct bau_control
*bcp
)
217 int cancel_count
= 0;
218 unsigned long msg_res
;
219 unsigned long mmr
= 0;
220 struct bau_pq_entry
*msg
= mdp
->msg
;
221 struct bau_pq_entry
*msg2
;
222 struct ptc_stats
*stat
= bcp
->statp
;
226 * cancel any message from msg+1 to the retry itself
228 for (msg2
= msg
+1, i
= 0; i
< DEST_Q_SIZE
; msg2
++, i
++) {
229 if (msg2
> mdp
->queue_last
)
230 msg2
= mdp
->queue_first
;
234 /* same conditions for cancellation as do_reset */
235 if ((msg2
->replied_to
== 0) && (msg2
->canceled
== 0) &&
236 (msg2
->swack_vec
) && ((msg2
->swack_vec
&
237 msg
->swack_vec
) == 0) &&
238 (msg2
->sending_cpu
== msg
->sending_cpu
) &&
239 (msg2
->msg_type
!= MSG_NOOP
)) {
240 mmr
= read_mmr_sw_ack();
241 msg_res
= msg2
->swack_vec
;
243 * This is a message retry; clear the resources held
244 * by the previous message only if they timed out.
245 * If it has not timed out we have an unexpected
246 * situation to report.
248 if (mmr
& (msg_res
<< UV_SW_ACK_NPENDING
)) {
251 * Is the resource timed out?
252 * Make everyone ignore the cancelled message.
257 mr
= (msg_res
<< UV_SW_ACK_NPENDING
) | msg_res
;
258 write_mmr_sw_ack(mr
);
263 stat
->d_nocanceled
++;
267 * Do all the things a cpu should do for a TLB shootdown message.
268 * Other cpu's may come here at the same time for this message.
270 static void bau_process_message(struct msg_desc
*mdp
, struct bau_control
*bcp
,
273 short socket_ack_count
= 0;
275 struct atomic_short
*asp
;
276 struct ptc_stats
*stat
= bcp
->statp
;
277 struct bau_pq_entry
*msg
= mdp
->msg
;
278 struct bau_control
*smaster
= bcp
->socket_master
;
281 * This must be a normal message, or retry of a normal message
283 if (msg
->address
== TLB_FLUSH_ALL
) {
287 __flush_tlb_one(msg
->address
);
293 * One cpu on each uvhub has the additional job on a RETRY
294 * of releasing the resource held by the message that is
295 * being retried. That message is identified by sending
298 if (msg
->msg_type
== MSG_RETRY
&& bcp
== bcp
->uvhub_master
)
299 bau_process_retry_msg(mdp
, bcp
);
302 * This is a swack message, so we have to reply to it.
303 * Count each responding cpu on the socket. This avoids
304 * pinging the count's cache line back and forth between
307 sp
= &smaster
->socket_acknowledge_count
[mdp
->msg_slot
];
308 asp
= (struct atomic_short
*)sp
;
309 socket_ack_count
= atom_asr(1, asp
);
310 if (socket_ack_count
== bcp
->cpus_in_socket
) {
313 * Both sockets dump their completed count total into
314 * the message's count.
317 asp
= (struct atomic_short
*)&msg
->acknowledge_count
;
318 msg_ack_count
= atom_asr(socket_ack_count
, asp
);
320 if (msg_ack_count
== bcp
->cpus_in_uvhub
) {
322 * All cpus in uvhub saw it; reply
323 * (unless we are in the UV2 workaround)
325 reply_to_message(mdp
, bcp
, do_acknowledge
);
333 * Determine the first cpu on a pnode.
335 static int pnode_to_first_cpu(int pnode
, struct bau_control
*smaster
)
338 struct hub_and_pnode
*hpp
;
340 for_each_present_cpu(cpu
) {
341 hpp
= &smaster
->thp
[cpu
];
342 if (pnode
== hpp
->pnode
)
349 * Last resort when we get a large number of destination timeouts is
350 * to clear resources held by a given cpu.
351 * Do this with IPI so that all messages in the BAU message queue
352 * can be identified by their nonzero swack_vec field.
354 * This is entered for a single cpu on the uvhub.
355 * The sender want's this uvhub to free a specific message's
358 static void do_reset(void *ptr
)
361 struct bau_control
*bcp
= &per_cpu(bau_control
, smp_processor_id());
362 struct reset_args
*rap
= (struct reset_args
*)ptr
;
363 struct bau_pq_entry
*msg
;
364 struct ptc_stats
*stat
= bcp
->statp
;
368 * We're looking for the given sender, and
369 * will free its swack resource.
370 * If all cpu's finally responded after the timeout, its
371 * message 'replied_to' was set.
373 for (msg
= bcp
->queue_first
, i
= 0; i
< DEST_Q_SIZE
; msg
++, i
++) {
374 unsigned long msg_res
;
375 /* do_reset: same conditions for cancellation as
376 bau_process_retry_msg() */
377 if ((msg
->replied_to
== 0) &&
378 (msg
->canceled
== 0) &&
379 (msg
->sending_cpu
== rap
->sender
) &&
381 (msg
->msg_type
!= MSG_NOOP
)) {
385 * make everyone else ignore this message
389 * only reset the resource if it is still pending
391 mmr
= read_mmr_sw_ack();
392 msg_res
= msg
->swack_vec
;
393 mr
= (msg_res
<< UV_SW_ACK_NPENDING
) | msg_res
;
396 write_mmr_sw_ack(mr
);
404 * Use IPI to get all target uvhubs to release resources held by
405 * a given sending cpu number.
407 static void reset_with_ipi(struct pnmask
*distribution
, struct bau_control
*bcp
)
412 int sender
= bcp
->cpu
;
413 cpumask_t
*mask
= bcp
->uvhub_master
->cpumask
;
414 struct bau_control
*smaster
= bcp
->socket_master
;
415 struct reset_args reset_args
;
417 reset_args
.sender
= sender
;
419 /* find a single cpu for each uvhub in this distribution mask */
420 maskbits
= sizeof(struct pnmask
) * BITSPERBYTE
;
421 /* each bit is a pnode relative to the partition base pnode */
422 for (pnode
= 0; pnode
< maskbits
; pnode
++) {
424 if (!bau_uvhub_isset(pnode
, distribution
))
426 apnode
= pnode
+ bcp
->partition_base_pnode
;
427 cpu
= pnode_to_first_cpu(apnode
, smaster
);
431 /* IPI all cpus; preemption is already disabled */
432 smp_call_function_many(mask
, do_reset
, (void *)&reset_args
, 1);
436 static inline unsigned long cycles_2_us(unsigned long long cyc
)
438 unsigned long long ns
;
440 int cpu
= smp_processor_id();
442 ns
= (cyc
* per_cpu(cyc2ns
, cpu
)) >> CYC2NS_SCALE_FACTOR
;
448 * wait for all cpus on this hub to finish their sends and go quiet
449 * leaves uvhub_quiesce set so that no new broadcasts are started by
450 * bau_flush_send_and_wait()
452 static inline void quiesce_local_uvhub(struct bau_control
*hmaster
)
454 atom_asr(1, (struct atomic_short
*)&hmaster
->uvhub_quiesce
);
458 * mark this quiet-requestor as done
460 static inline void end_uvhub_quiesce(struct bau_control
*hmaster
)
462 atom_asr(-1, (struct atomic_short
*)&hmaster
->uvhub_quiesce
);
465 static unsigned long uv1_read_status(unsigned long mmr_offset
, int right_shift
)
467 unsigned long descriptor_status
;
469 descriptor_status
= uv_read_local_mmr(mmr_offset
);
470 descriptor_status
>>= right_shift
;
471 descriptor_status
&= UV_ACT_STATUS_MASK
;
472 return descriptor_status
;
476 * Wait for completion of a broadcast software ack message
477 * return COMPLETE, RETRY(PLUGGED or TIMEOUT) or GIVEUP
479 static int uv1_wait_completion(struct bau_desc
*bau_desc
,
480 unsigned long mmr_offset
, int right_shift
,
481 struct bau_control
*bcp
, long try)
483 unsigned long descriptor_status
;
485 struct ptc_stats
*stat
= bcp
->statp
;
487 descriptor_status
= uv1_read_status(mmr_offset
, right_shift
);
488 /* spin on the status MMR, waiting for it to go idle */
489 while ((descriptor_status
!= DS_IDLE
)) {
491 * Our software ack messages may be blocked because
492 * there are no swack resources available. As long
493 * as none of them has timed out hardware will NACK
494 * our message and its state will stay IDLE.
496 if (descriptor_status
== DS_SOURCE_TIMEOUT
) {
499 } else if (descriptor_status
== DS_DESTINATION_TIMEOUT
) {
504 * Our retries may be blocked by all destination
505 * swack resources being consumed, and a timeout
506 * pending. In that case hardware returns the
507 * ERROR that looks like a destination timeout.
509 if (cycles_2_us(ttm
- bcp
->send_message
) < timeout_us
) {
510 bcp
->conseccompletes
= 0;
511 return FLUSH_RETRY_PLUGGED
;
514 bcp
->conseccompletes
= 0;
515 return FLUSH_RETRY_TIMEOUT
;
518 * descriptor_status is still BUSY
522 descriptor_status
= uv1_read_status(mmr_offset
, right_shift
);
524 bcp
->conseccompletes
++;
525 return FLUSH_COMPLETE
;
529 * UV2 could have an extra bit of status in the ACTIVATION_STATUS_2 register.
530 * But not currently used.
532 static unsigned long uv2_read_status(unsigned long offset
, int rshft
, int desc
)
534 unsigned long descriptor_status
;
537 ((read_lmmr(offset
) >> rshft
) & UV_ACT_STATUS_MASK
) << 1;
538 return descriptor_status
;
542 * Return whether the status of the descriptor that is normally used for this
543 * cpu (the one indexed by its hub-relative cpu number) is busy.
544 * The status of the original 32 descriptors is always reflected in the 64
545 * bits of UVH_LB_BAU_SB_ACTIVATION_STATUS_0.
546 * The bit provided by the activation_status_2 register is irrelevant to
547 * the status if it is only being tested for busy or not busy.
549 int normal_busy(struct bau_control
*bcp
)
551 int cpu
= bcp
->uvhub_cpu
;
555 mmr_offset
= UVH_LB_BAU_SB_ACTIVATION_STATUS_0
;
556 right_shift
= cpu
* UV_ACT_STATUS_SIZE
;
557 return (((((read_lmmr(mmr_offset
) >> right_shift
) &
558 UV_ACT_STATUS_MASK
)) << 1) == UV2H_DESC_BUSY
);
562 * Entered when a bau descriptor has gone into a permanent busy wait because
564 * Workaround the bug.
566 int handle_uv2_busy(struct bau_control
*bcp
)
568 struct ptc_stats
*stat
= bcp
->statp
;
575 static int uv2_wait_completion(struct bau_desc
*bau_desc
,
576 unsigned long mmr_offset
, int right_shift
,
577 struct bau_control
*bcp
, long try)
579 unsigned long descriptor_stat
;
581 int desc
= bcp
->uvhub_cpu
;
583 struct ptc_stats
*stat
= bcp
->statp
;
585 descriptor_stat
= uv2_read_status(mmr_offset
, right_shift
, desc
);
587 /* spin on the status MMR, waiting for it to go idle */
588 while (descriptor_stat
!= UV2H_DESC_IDLE
) {
589 if ((descriptor_stat
== UV2H_DESC_SOURCE_TIMEOUT
)) {
591 * A h/w bug on the destination side may
592 * have prevented the message being marked
593 * pending, thus it doesn't get replied to
594 * and gets continually nacked until it times
595 * out with a SOURCE_TIMEOUT.
599 } else if (descriptor_stat
== UV2H_DESC_DEST_TIMEOUT
) {
603 * Our retries may be blocked by all destination
604 * swack resources being consumed, and a timeout
605 * pending. In that case hardware returns the
606 * ERROR that looks like a destination timeout.
607 * Without using the extended status we have to
608 * deduce from the short time that this was a
611 if (cycles_2_us(ttm
- bcp
->send_message
) < timeout_us
) {
612 bcp
->conseccompletes
= 0;
614 /* FLUSH_RETRY_PLUGGED causes hang on boot */
618 bcp
->conseccompletes
= 0;
619 /* FLUSH_RETRY_TIMEOUT causes hang on boot */
623 if (busy_reps
> 1000000) {
624 /* not to hammer on the clock */
627 if ((ttm
- bcp
->send_message
) >
628 bcp
->timeout_interval
)
629 return handle_uv2_busy(bcp
);
632 * descriptor_stat is still BUSY
636 descriptor_stat
= uv2_read_status(mmr_offset
, right_shift
,
639 bcp
->conseccompletes
++;
640 return FLUSH_COMPLETE
;
644 * There are 2 status registers; each and array[32] of 2 bits. Set up for
645 * which register to read and position in that register based on cpu in
648 static int wait_completion(struct bau_desc
*bau_desc
,
649 struct bau_control
*bcp
, long try)
652 unsigned long mmr_offset
;
653 int desc
= bcp
->uvhub_cpu
;
655 if (desc
< UV_CPUS_PER_AS
) {
656 mmr_offset
= UVH_LB_BAU_SB_ACTIVATION_STATUS_0
;
657 right_shift
= desc
* UV_ACT_STATUS_SIZE
;
659 mmr_offset
= UVH_LB_BAU_SB_ACTIVATION_STATUS_1
;
660 right_shift
= ((desc
- UV_CPUS_PER_AS
) * UV_ACT_STATUS_SIZE
);
663 if (bcp
->uvhub_version
== 1)
664 return uv1_wait_completion(bau_desc
, mmr_offset
, right_shift
,
667 return uv2_wait_completion(bau_desc
, mmr_offset
, right_shift
,
671 static inline cycles_t
sec_2_cycles(unsigned long sec
)
676 ns
= sec
* 1000000000;
677 cyc
= (ns
<< CYC2NS_SCALE_FACTOR
)/(per_cpu(cyc2ns
, smp_processor_id()));
682 * Our retries are blocked by all destination sw ack resources being
683 * in use, and a timeout is pending. In that case hardware immediately
684 * returns the ERROR that looks like a destination timeout.
686 static void destination_plugged(struct bau_desc
*bau_desc
,
687 struct bau_control
*bcp
,
688 struct bau_control
*hmaster
, struct ptc_stats
*stat
)
690 udelay(bcp
->plugged_delay
);
691 bcp
->plugged_tries
++;
693 if (bcp
->plugged_tries
>= bcp
->plugsb4reset
) {
694 bcp
->plugged_tries
= 0;
696 quiesce_local_uvhub(hmaster
);
698 spin_lock(&hmaster
->queue_lock
);
699 reset_with_ipi(&bau_desc
->distribution
, bcp
);
700 spin_unlock(&hmaster
->queue_lock
);
702 end_uvhub_quiesce(hmaster
);
705 stat
->s_resets_plug
++;
709 static void destination_timeout(struct bau_desc
*bau_desc
,
710 struct bau_control
*bcp
, struct bau_control
*hmaster
,
711 struct ptc_stats
*stat
)
713 hmaster
->max_concurr
= 1;
714 bcp
->timeout_tries
++;
715 if (bcp
->timeout_tries
>= bcp
->timeoutsb4reset
) {
716 bcp
->timeout_tries
= 0;
718 quiesce_local_uvhub(hmaster
);
720 spin_lock(&hmaster
->queue_lock
);
721 reset_with_ipi(&bau_desc
->distribution
, bcp
);
722 spin_unlock(&hmaster
->queue_lock
);
724 end_uvhub_quiesce(hmaster
);
727 stat
->s_resets_timeout
++;
732 * Stop all cpus on a uvhub from using the BAU for a period of time.
733 * This is reversed by check_enable.
735 static void disable_for_period(struct bau_control
*bcp
, struct ptc_stats
*stat
)
738 struct bau_control
*tbcp
;
739 struct bau_control
*hmaster
;
742 hmaster
= bcp
->uvhub_master
;
743 spin_lock(&hmaster
->disable_lock
);
744 if (!bcp
->baudisabled
) {
745 stat
->s_bau_disabled
++;
747 for_each_present_cpu(tcpu
) {
748 tbcp
= &per_cpu(bau_control
, tcpu
);
749 if (tbcp
->uvhub_master
== hmaster
) {
750 tbcp
->baudisabled
= 1;
751 tbcp
->set_bau_on_time
=
752 tm1
+ bcp
->disabled_period
;
756 spin_unlock(&hmaster
->disable_lock
);
759 static void count_max_concurr(int stat
, struct bau_control
*bcp
,
760 struct bau_control
*hmaster
)
762 bcp
->plugged_tries
= 0;
763 bcp
->timeout_tries
= 0;
764 if (stat
!= FLUSH_COMPLETE
)
766 if (bcp
->conseccompletes
<= bcp
->complete_threshold
)
768 if (hmaster
->max_concurr
>= hmaster
->max_concurr_const
)
770 hmaster
->max_concurr
++;
773 static void record_send_stats(cycles_t time1
, cycles_t time2
,
774 struct bau_control
*bcp
, struct ptc_stats
*stat
,
775 int completion_status
, int try)
780 elapsed
= time2
- time1
;
781 stat
->s_time
+= elapsed
;
783 if ((completion_status
== FLUSH_COMPLETE
) && (try == 1)) {
784 bcp
->period_requests
++;
785 bcp
->period_time
+= elapsed
;
786 if ((elapsed
> congested_cycles
) &&
787 (bcp
->period_requests
> bcp
->cong_reps
) &&
788 ((bcp
->period_time
/ bcp
->period_requests
) >
791 disable_for_period(bcp
, stat
);
797 if (completion_status
== FLUSH_COMPLETE
&& try > 1)
799 else if (completion_status
== FLUSH_GIVEUP
) {
801 if (get_cycles() > bcp
->period_end
)
802 bcp
->period_giveups
= 0;
803 bcp
->period_giveups
++;
804 if (bcp
->period_giveups
== 1)
805 bcp
->period_end
= get_cycles() + bcp
->disabled_period
;
806 if (bcp
->period_giveups
> bcp
->giveup_limit
) {
807 disable_for_period(bcp
, stat
);
808 stat
->s_giveuplimit
++;
814 * Because of a uv1 hardware bug only a limited number of concurrent
815 * requests can be made.
817 static void uv1_throttle(struct bau_control
*hmaster
, struct ptc_stats
*stat
)
819 spinlock_t
*lock
= &hmaster
->uvhub_lock
;
822 v
= &hmaster
->active_descriptor_count
;
823 if (!atomic_inc_unless_ge(lock
, v
, hmaster
->max_concurr
)) {
827 } while (!atomic_inc_unless_ge(lock
, v
, hmaster
->max_concurr
));
832 * Handle the completion status of a message send.
834 static void handle_cmplt(int completion_status
, struct bau_desc
*bau_desc
,
835 struct bau_control
*bcp
, struct bau_control
*hmaster
,
836 struct ptc_stats
*stat
)
838 if (completion_status
== FLUSH_RETRY_PLUGGED
)
839 destination_plugged(bau_desc
, bcp
, hmaster
, stat
);
840 else if (completion_status
== FLUSH_RETRY_TIMEOUT
)
841 destination_timeout(bau_desc
, bcp
, hmaster
, stat
);
845 * Send a broadcast and wait for it to complete.
847 * The flush_mask contains the cpus the broadcast is to be sent to including
848 * cpus that are on the local uvhub.
850 * Returns 0 if all flushing represented in the mask was done.
851 * Returns 1 if it gives up entirely and the original cpu mask is to be
852 * returned to the kernel.
854 int uv_flush_send_and_wait(struct cpumask
*flush_mask
, struct bau_control
*bcp
,
855 struct bau_desc
*bau_desc
)
858 int completion_stat
= 0;
864 struct ptc_stats
*stat
= bcp
->statp
;
865 struct bau_control
*hmaster
= bcp
->uvhub_master
;
866 struct uv1_bau_msg_header
*uv1_hdr
= NULL
;
867 struct uv2_bau_msg_header
*uv2_hdr
= NULL
;
869 if (bcp
->uvhub_version
== 1) {
871 uv1_throttle(hmaster
, stat
);
874 while (hmaster
->uvhub_quiesce
)
877 time1
= get_cycles();
879 uv1_hdr
= &bau_desc
->header
.uv1_hdr
;
881 uv2_hdr
= &bau_desc
->header
.uv2_hdr
;
886 uv1_hdr
->msg_type
= MSG_REGULAR
;
888 uv2_hdr
->msg_type
= MSG_REGULAR
;
889 seq_number
= bcp
->message_number
++;
892 uv1_hdr
->msg_type
= MSG_RETRY
;
894 uv2_hdr
->msg_type
= MSG_RETRY
;
895 stat
->s_retry_messages
++;
899 uv1_hdr
->sequence
= seq_number
;
901 uv2_hdr
->sequence
= seq_number
;
902 index
= (1UL << AS_PUSH_SHIFT
) | bcp
->uvhub_cpu
;
903 bcp
->send_message
= get_cycles();
905 write_mmr_activation(index
);
908 completion_stat
= wait_completion(bau_desc
, bcp
, try);
910 handle_cmplt(completion_stat
, bau_desc
, bcp
, hmaster
, stat
);
912 if (bcp
->ipi_attempts
>= bcp
->ipi_reset_limit
) {
913 bcp
->ipi_attempts
= 0;
914 stat
->s_overipilimit
++;
915 completion_stat
= FLUSH_GIVEUP
;
919 } while ((completion_stat
== FLUSH_RETRY_PLUGGED
) ||
920 (completion_stat
== FLUSH_RETRY_TIMEOUT
));
922 time2
= get_cycles();
924 count_max_concurr(completion_stat
, bcp
, hmaster
);
926 while (hmaster
->uvhub_quiesce
)
929 atomic_dec(&hmaster
->active_descriptor_count
);
931 record_send_stats(time1
, time2
, bcp
, stat
, completion_stat
, try);
933 if (completion_stat
== FLUSH_GIVEUP
)
934 /* FLUSH_GIVEUP will fall back to using IPI's for tlb flush */
940 * The BAU is disabled for this uvhub. When the disabled time period has
941 * expired re-enable it.
942 * Return 0 if it is re-enabled for all cpus on this uvhub.
944 static int check_enable(struct bau_control
*bcp
, struct ptc_stats
*stat
)
947 struct bau_control
*tbcp
;
948 struct bau_control
*hmaster
;
950 hmaster
= bcp
->uvhub_master
;
951 spin_lock(&hmaster
->disable_lock
);
952 if (bcp
->baudisabled
&& (get_cycles() >= bcp
->set_bau_on_time
)) {
953 stat
->s_bau_reenabled
++;
954 for_each_present_cpu(tcpu
) {
955 tbcp
= &per_cpu(bau_control
, tcpu
);
956 if (tbcp
->uvhub_master
== hmaster
) {
957 tbcp
->baudisabled
= 0;
958 tbcp
->period_requests
= 0;
959 tbcp
->period_time
= 0;
960 tbcp
->period_giveups
= 0;
963 spin_unlock(&hmaster
->disable_lock
);
966 spin_unlock(&hmaster
->disable_lock
);
970 static void record_send_statistics(struct ptc_stats
*stat
, int locals
, int hubs
,
971 int remotes
, struct bau_desc
*bau_desc
)
974 stat
->s_ntargcpu
+= remotes
+ locals
;
975 stat
->s_ntargremotes
+= remotes
;
976 stat
->s_ntarglocals
+= locals
;
978 /* uvhub statistics */
979 hubs
= bau_uvhub_weight(&bau_desc
->distribution
);
981 stat
->s_ntarglocaluvhub
++;
982 stat
->s_ntargremoteuvhub
+= (hubs
- 1);
984 stat
->s_ntargremoteuvhub
+= hubs
;
986 stat
->s_ntarguvhub
+= hubs
;
989 stat
->s_ntarguvhub16
++;
991 stat
->s_ntarguvhub8
++;
993 stat
->s_ntarguvhub4
++;
995 stat
->s_ntarguvhub2
++;
997 stat
->s_ntarguvhub1
++;
1001 * Translate a cpu mask to the uvhub distribution mask in the BAU
1002 * activation descriptor.
1004 static int set_distrib_bits(struct cpumask
*flush_mask
, struct bau_control
*bcp
,
1005 struct bau_desc
*bau_desc
, int *localsp
, int *remotesp
)
1010 struct hub_and_pnode
*hpp
;
1012 for_each_cpu(cpu
, flush_mask
) {
1014 * The distribution vector is a bit map of pnodes, relative
1015 * to the partition base pnode (and the partition base nasid
1017 * Translate cpu to pnode and hub using a local memory array.
1019 hpp
= &bcp
->socket_master
->thp
[cpu
];
1020 pnode
= hpp
->pnode
- bcp
->partition_base_pnode
;
1021 bau_uvhub_set(pnode
, &bau_desc
->distribution
);
1023 if (hpp
->uvhub
== bcp
->uvhub
)
1034 * globally purge translation cache of a virtual address or all TLB's
1035 * @cpumask: mask of all cpu's in which the address is to be removed
1036 * @mm: mm_struct containing virtual address range
1037 * @start: start virtual address to be removed from TLB
1038 * @end: end virtual address to be remove from TLB
1039 * @cpu: the current cpu
1041 * This is the entry point for initiating any UV global TLB shootdown.
1043 * Purges the translation caches of all specified processors of the given
1044 * virtual address, or purges all TLB's on specified processors.
1046 * The caller has derived the cpumask from the mm_struct. This function
1047 * is called only if there are bits set in the mask. (e.g. flush_tlb_page())
1049 * The cpumask is converted into a uvhubmask of the uvhubs containing
1052 * Note that this function should be called with preemption disabled.
1054 * Returns NULL if all remote flushing was done.
1055 * Returns pointer to cpumask if some remote flushing remains to be
1056 * done. The returned pointer is valid till preemption is re-enabled.
1058 const struct cpumask
*uv_flush_tlb_others(const struct cpumask
*cpumask
,
1059 struct mm_struct
*mm
, unsigned long start
,
1060 unsigned long end
, unsigned int cpu
)
1065 struct bau_desc
*bau_desc
;
1066 struct cpumask
*flush_mask
;
1067 struct ptc_stats
*stat
;
1068 struct bau_control
*bcp
;
1069 unsigned long descriptor_status
;
1070 unsigned long status
;
1072 bcp
= &per_cpu(bau_control
, cpu
);
1081 read_lmmr(UVH_LB_BAU_SB_ACTIVATION_STATUS_0
);
1082 status
= ((descriptor_status
>> (bcp
->uvhub_cpu
*
1083 UV_ACT_STATUS_SIZE
)) & UV_ACT_STATUS_MASK
) << 1;
1084 if (status
== UV2H_DESC_BUSY
)
1089 /* bau was disabled due to slow response */
1090 if (bcp
->baudisabled
) {
1091 if (check_enable(bcp
, stat
)) {
1092 stat
->s_ipifordisabled
++;
1098 * Each sending cpu has a per-cpu mask which it fills from the caller's
1099 * cpu mask. All cpus are converted to uvhubs and copied to the
1100 * activation descriptor.
1102 flush_mask
= (struct cpumask
*)per_cpu(uv_flush_tlb_mask
, cpu
);
1103 /* don't actually do a shootdown of the local cpu */
1104 cpumask_andnot(flush_mask
, cpumask
, cpumask_of(cpu
));
1106 if (cpu_isset(cpu
, *cpumask
))
1107 stat
->s_ntargself
++;
1109 bau_desc
= bcp
->descriptor_base
;
1110 bau_desc
+= (ITEMS_PER_DESC
* bcp
->uvhub_cpu
);
1111 bau_uvhubs_clear(&bau_desc
->distribution
, UV_DISTRIBUTION_SIZE
);
1112 if (set_distrib_bits(flush_mask
, bcp
, bau_desc
, &locals
, &remotes
))
1115 record_send_statistics(stat
, locals
, hubs
, remotes
, bau_desc
);
1117 if (!end
|| (end
- start
) <= PAGE_SIZE
)
1118 bau_desc
->payload
.address
= start
;
1120 bau_desc
->payload
.address
= TLB_FLUSH_ALL
;
1121 bau_desc
->payload
.sending_cpu
= cpu
;
1123 * uv_flush_send_and_wait returns 0 if all cpu's were messaged,
1124 * or 1 if it gave up and the original cpumask should be returned.
1126 if (!uv_flush_send_and_wait(flush_mask
, bcp
, bau_desc
))
1133 * Search the message queue for any 'other' unprocessed message with the
1134 * same software acknowledge resource bit vector as the 'msg' message.
1136 struct bau_pq_entry
*find_another_by_swack(struct bau_pq_entry
*msg
,
1137 struct bau_control
*bcp
)
1139 struct bau_pq_entry
*msg_next
= msg
+ 1;
1140 unsigned char swack_vec
= msg
->swack_vec
;
1142 if (msg_next
> bcp
->queue_last
)
1143 msg_next
= bcp
->queue_first
;
1144 while (msg_next
!= msg
) {
1145 if ((msg_next
->canceled
== 0) && (msg_next
->replied_to
== 0) &&
1146 (msg_next
->swack_vec
== swack_vec
))
1149 if (msg_next
> bcp
->queue_last
)
1150 msg_next
= bcp
->queue_first
;
1156 * UV2 needs to work around a bug in which an arriving message has not
1157 * set a bit in the UVH_LB_BAU_INTD_SOFTWARE_ACKNOWLEDGE register.
1158 * Such a message must be ignored.
1160 void process_uv2_message(struct msg_desc
*mdp
, struct bau_control
*bcp
)
1162 unsigned long mmr_image
;
1163 unsigned char swack_vec
;
1164 struct bau_pq_entry
*msg
= mdp
->msg
;
1165 struct bau_pq_entry
*other_msg
;
1167 mmr_image
= read_mmr_sw_ack();
1168 swack_vec
= msg
->swack_vec
;
1170 if ((swack_vec
& mmr_image
) == 0) {
1172 * This message was assigned a swack resource, but no
1173 * reserved acknowlegment is pending.
1174 * The bug has prevented this message from setting the MMR.
1177 * Some message has set the MMR 'pending' bit; it might have
1178 * been another message. Look for that message.
1180 other_msg
= find_another_by_swack(msg
, bcp
);
1183 * There is another. Process this one but do not
1186 bau_process_message(mdp
, bcp
, 0);
1188 * Let the natural processing of that other message
1189 * acknowledge it. Don't get the processing of sw_ack's
1197 * Either the MMR shows this one pending a reply or there is no
1198 * other message using this sw_ack, so it is safe to acknowledge it.
1200 bau_process_message(mdp
, bcp
, 1);
1206 * The BAU message interrupt comes here. (registered by set_intr_gate)
1209 * We received a broadcast assist message.
1211 * Interrupts are disabled; this interrupt could represent
1212 * the receipt of several messages.
1214 * All cores/threads on this hub get this interrupt.
1215 * The last one to see it does the software ack.
1216 * (the resource will not be freed until noninterruptable cpus see this
1217 * interrupt; hardware may timeout the s/w ack and reply ERROR)
1219 void uv_bau_message_interrupt(struct pt_regs
*regs
)
1222 cycles_t time_start
;
1223 struct bau_pq_entry
*msg
;
1224 struct bau_control
*bcp
;
1225 struct ptc_stats
*stat
;
1226 struct msg_desc msgdesc
;
1229 time_start
= get_cycles();
1231 bcp
= &per_cpu(bau_control
, smp_processor_id());
1234 msgdesc
.queue_first
= bcp
->queue_first
;
1235 msgdesc
.queue_last
= bcp
->queue_last
;
1237 msg
= bcp
->bau_msg_head
;
1238 while (msg
->swack_vec
) {
1241 msgdesc
.msg_slot
= msg
- msgdesc
.queue_first
;
1243 if (bcp
->uvhub_version
== 2)
1244 process_uv2_message(&msgdesc
, bcp
);
1246 bau_process_message(&msgdesc
, bcp
, 1);
1249 if (msg
> msgdesc
.queue_last
)
1250 msg
= msgdesc
.queue_first
;
1251 bcp
->bau_msg_head
= msg
;
1253 stat
->d_time
+= (get_cycles() - time_start
);
1261 * Each target uvhub (i.e. a uvhub that has cpu's) needs to have
1262 * shootdown message timeouts enabled. The timeout does not cause
1263 * an interrupt, but causes an error message to be returned to
1266 static void __init
enable_timeouts(void)
1271 unsigned long mmr_image
;
1273 nuvhubs
= uv_num_possible_blades();
1275 for (uvhub
= 0; uvhub
< nuvhubs
; uvhub
++) {
1276 if (!uv_blade_nr_possible_cpus(uvhub
))
1279 pnode
= uv_blade_to_pnode(uvhub
);
1280 mmr_image
= read_mmr_misc_control(pnode
);
1282 * Set the timeout period and then lock it in, in three
1283 * steps; captures and locks in the period.
1285 * To program the period, the SOFT_ACK_MODE must be off.
1287 mmr_image
&= ~(1L << SOFTACK_MSHIFT
);
1288 write_mmr_misc_control(pnode
, mmr_image
);
1290 * Set the 4-bit period.
1292 mmr_image
&= ~((unsigned long)0xf << SOFTACK_PSHIFT
);
1293 mmr_image
|= (SOFTACK_TIMEOUT_PERIOD
<< SOFTACK_PSHIFT
);
1294 write_mmr_misc_control(pnode
, mmr_image
);
1297 * Subsequent reversals of the timebase bit (3) cause an
1298 * immediate timeout of one or all INTD resources as
1299 * indicated in bits 2:0 (7 causes all of them to timeout).
1301 mmr_image
|= (1L << SOFTACK_MSHIFT
);
1303 /* hw bug workaround; do not use extended status */
1304 mmr_image
&= ~(1L << UV2_EXT_SHFT
);
1306 write_mmr_misc_control(pnode
, mmr_image
);
1310 static void *ptc_seq_start(struct seq_file
*file
, loff_t
*offset
)
1312 if (*offset
< num_possible_cpus())
1317 static void *ptc_seq_next(struct seq_file
*file
, void *data
, loff_t
*offset
)
1320 if (*offset
< num_possible_cpus())
1325 static void ptc_seq_stop(struct seq_file
*file
, void *data
)
1329 static inline unsigned long long usec_2_cycles(unsigned long microsec
)
1332 unsigned long long cyc
;
1334 ns
= microsec
* 1000;
1335 cyc
= (ns
<< CYC2NS_SCALE_FACTOR
)/(per_cpu(cyc2ns
, smp_processor_id()));
1340 * Display the statistics thru /proc/sgi_uv/ptc_statistics
1341 * 'data' points to the cpu number
1342 * Note: see the descriptions in stat_description[].
1344 static int ptc_seq_show(struct seq_file
*file
, void *data
)
1346 struct ptc_stats
*stat
;
1347 struct bau_control
*bcp
;
1350 cpu
= *(loff_t
*)data
;
1353 "# cpu bauoff sent stime self locals remotes ncpus localhub ");
1355 "remotehub numuvhubs numuvhubs16 numuvhubs8 ");
1357 "numuvhubs4 numuvhubs2 numuvhubs1 dto snacks retries ");
1359 "rok resetp resett giveup sto bz throt disable ");
1361 "enable wars warshw warwaits enters ipidis plugged ");
1363 "ipiover glim cong swack recv rtime all one mult ");
1365 "none retry canc nocan reset rcan\n");
1367 if (cpu
< num_possible_cpus() && cpu_online(cpu
)) {
1368 bcp
= &per_cpu(bau_control
, cpu
);
1370 /* source side statistics */
1372 "cpu %d %d %ld %ld %ld %ld %ld %ld %ld %ld %ld %ld ",
1373 cpu
, bcp
->nobau
, stat
->s_requestor
,
1374 cycles_2_us(stat
->s_time
),
1375 stat
->s_ntargself
, stat
->s_ntarglocals
,
1376 stat
->s_ntargremotes
, stat
->s_ntargcpu
,
1377 stat
->s_ntarglocaluvhub
, stat
->s_ntargremoteuvhub
,
1378 stat
->s_ntarguvhub
, stat
->s_ntarguvhub16
);
1379 seq_printf(file
, "%ld %ld %ld %ld %ld %ld ",
1380 stat
->s_ntarguvhub8
, stat
->s_ntarguvhub4
,
1381 stat
->s_ntarguvhub2
, stat
->s_ntarguvhub1
,
1382 stat
->s_dtimeout
, stat
->s_strongnacks
);
1383 seq_printf(file
, "%ld %ld %ld %ld %ld %ld %ld %ld ",
1384 stat
->s_retry_messages
, stat
->s_retriesok
,
1385 stat
->s_resets_plug
, stat
->s_resets_timeout
,
1386 stat
->s_giveup
, stat
->s_stimeout
,
1387 stat
->s_busy
, stat
->s_throttles
);
1388 seq_printf(file
, "%ld %ld %ld %ld %ld %ld %ld %ld %ld %ld %ld ",
1389 stat
->s_bau_disabled
, stat
->s_bau_reenabled
,
1390 stat
->s_uv2_wars
, stat
->s_uv2_wars_hw
,
1391 stat
->s_uv2_war_waits
, stat
->s_enters
,
1392 stat
->s_ipifordisabled
, stat
->s_plugged
,
1393 stat
->s_overipilimit
, stat
->s_giveuplimit
,
1396 /* destination side statistics */
1398 "%lx %ld %ld %ld %ld %ld %ld %ld %ld %ld %ld %ld\n",
1399 read_gmmr_sw_ack(uv_cpu_to_pnode(cpu
)),
1400 stat
->d_requestee
, cycles_2_us(stat
->d_time
),
1401 stat
->d_alltlb
, stat
->d_onetlb
, stat
->d_multmsg
,
1402 stat
->d_nomsg
, stat
->d_retries
, stat
->d_canceled
,
1403 stat
->d_nocanceled
, stat
->d_resets
,
1410 * Display the tunables thru debugfs
1412 static ssize_t
tunables_read(struct file
*file
, char __user
*userbuf
,
1413 size_t count
, loff_t
*ppos
)
1418 buf
= kasprintf(GFP_KERNEL
, "%s %s %s\n%d %d %d %d %d %d %d %d %d %d\n",
1419 "max_concur plugged_delay plugsb4reset timeoutsb4reset",
1420 "ipi_reset_limit complete_threshold congested_response_us",
1421 "congested_reps disabled_period giveup_limit",
1422 max_concurr
, plugged_delay
, plugsb4reset
,
1423 timeoutsb4reset
, ipi_reset_limit
, complete_threshold
,
1424 congested_respns_us
, congested_reps
, disabled_period
,
1430 ret
= simple_read_from_buffer(userbuf
, count
, ppos
, buf
, strlen(buf
));
1436 * handle a write to /proc/sgi_uv/ptc_statistics
1437 * -1: reset the statistics
1438 * 0: display meaning of the statistics
1440 static ssize_t
ptc_proc_write(struct file
*file
, const char __user
*user
,
1441 size_t count
, loff_t
*data
)
1448 struct ptc_stats
*stat
;
1450 if (count
== 0 || count
> sizeof(optstr
))
1452 if (copy_from_user(optstr
, user
, count
))
1454 optstr
[count
- 1] = '\0';
1456 if (!strcmp(optstr
, "on")) {
1459 } else if (!strcmp(optstr
, "off")) {
1464 if (strict_strtol(optstr
, 10, &input_arg
) < 0) {
1465 printk(KERN_DEBUG
"%s is invalid\n", optstr
);
1469 if (input_arg
== 0) {
1470 elements
= sizeof(stat_description
)/sizeof(*stat_description
);
1471 printk(KERN_DEBUG
"# cpu: cpu number\n");
1472 printk(KERN_DEBUG
"Sender statistics:\n");
1473 for (i
= 0; i
< elements
; i
++)
1474 printk(KERN_DEBUG
"%s\n", stat_description
[i
]);
1475 } else if (input_arg
== -1) {
1476 for_each_present_cpu(cpu
) {
1477 stat
= &per_cpu(ptcstats
, cpu
);
1478 memset(stat
, 0, sizeof(struct ptc_stats
));
1485 static int local_atoi(const char *name
)
1492 val
= 10*val
+(*name
-'0');
1501 * Parse the values written to /sys/kernel/debug/sgi_uv/bau_tunables.
1502 * Zero values reset them to defaults.
1504 static int parse_tunables_write(struct bau_control
*bcp
, char *instr
,
1511 int e
= sizeof(tunables
) / sizeof(*tunables
);
1513 p
= instr
+ strspn(instr
, WHITESPACE
);
1515 for (; *p
; p
= q
+ strspn(q
, WHITESPACE
)) {
1516 q
= p
+ strcspn(p
, WHITESPACE
);
1522 printk(KERN_INFO
"bau tunable error: should be %d values\n", e
);
1526 p
= instr
+ strspn(instr
, WHITESPACE
);
1528 for (cnt
= 0; *p
; p
= q
+ strspn(q
, WHITESPACE
), cnt
++) {
1529 q
= p
+ strcspn(p
, WHITESPACE
);
1530 val
= local_atoi(p
);
1534 max_concurr
= MAX_BAU_CONCURRENT
;
1535 max_concurr_const
= MAX_BAU_CONCURRENT
;
1538 if (val
< 1 || val
> bcp
->cpus_in_uvhub
) {
1540 "Error: BAU max concurrent %d is invalid\n",
1545 max_concurr_const
= val
;
1549 *tunables
[cnt
].tunp
= tunables
[cnt
].deflt
;
1551 *tunables
[cnt
].tunp
= val
;
1561 * Handle a write to debugfs. (/sys/kernel/debug/sgi_uv/bau_tunables)
1563 static ssize_t
tunables_write(struct file
*file
, const char __user
*user
,
1564 size_t count
, loff_t
*data
)
1569 struct bau_control
*bcp
;
1571 if (count
== 0 || count
> sizeof(instr
)-1)
1573 if (copy_from_user(instr
, user
, count
))
1576 instr
[count
] = '\0';
1579 bcp
= &per_cpu(bau_control
, cpu
);
1580 ret
= parse_tunables_write(bcp
, instr
, count
);
1585 for_each_present_cpu(cpu
) {
1586 bcp
= &per_cpu(bau_control
, cpu
);
1587 bcp
->max_concurr
= max_concurr
;
1588 bcp
->max_concurr_const
= max_concurr
;
1589 bcp
->plugged_delay
= plugged_delay
;
1590 bcp
->plugsb4reset
= plugsb4reset
;
1591 bcp
->timeoutsb4reset
= timeoutsb4reset
;
1592 bcp
->ipi_reset_limit
= ipi_reset_limit
;
1593 bcp
->complete_threshold
= complete_threshold
;
1594 bcp
->cong_response_us
= congested_respns_us
;
1595 bcp
->cong_reps
= congested_reps
;
1596 bcp
->disabled_period
= sec_2_cycles(disabled_period
);
1597 bcp
->giveup_limit
= giveup_limit
;
1602 static const struct seq_operations uv_ptc_seq_ops
= {
1603 .start
= ptc_seq_start
,
1604 .next
= ptc_seq_next
,
1605 .stop
= ptc_seq_stop
,
1606 .show
= ptc_seq_show
1609 static int ptc_proc_open(struct inode
*inode
, struct file
*file
)
1611 return seq_open(file
, &uv_ptc_seq_ops
);
1614 static int tunables_open(struct inode
*inode
, struct file
*file
)
1619 static const struct file_operations proc_uv_ptc_operations
= {
1620 .open
= ptc_proc_open
,
1622 .write
= ptc_proc_write
,
1623 .llseek
= seq_lseek
,
1624 .release
= seq_release
,
1627 static const struct file_operations tunables_fops
= {
1628 .open
= tunables_open
,
1629 .read
= tunables_read
,
1630 .write
= tunables_write
,
1631 .llseek
= default_llseek
,
1634 static int __init
uv_ptc_init(void)
1636 struct proc_dir_entry
*proc_uv_ptc
;
1638 if (!is_uv_system())
1641 proc_uv_ptc
= proc_create(UV_PTC_BASENAME
, 0444, NULL
,
1642 &proc_uv_ptc_operations
);
1644 printk(KERN_ERR
"unable to create %s proc entry\n",
1649 tunables_dir
= debugfs_create_dir(UV_BAU_TUNABLES_DIR
, NULL
);
1650 if (!tunables_dir
) {
1651 printk(KERN_ERR
"unable to create debugfs directory %s\n",
1652 UV_BAU_TUNABLES_DIR
);
1655 tunables_file
= debugfs_create_file(UV_BAU_TUNABLES_FILE
, 0600,
1656 tunables_dir
, NULL
, &tunables_fops
);
1657 if (!tunables_file
) {
1658 printk(KERN_ERR
"unable to create debugfs file %s\n",
1659 UV_BAU_TUNABLES_FILE
);
1666 * Initialize the sending side's sending buffers.
1668 static void activation_descriptor_init(int node
, int pnode
, int base_pnode
)
1677 struct bau_desc
*bau_desc
;
1678 struct bau_desc
*bd2
;
1679 struct uv1_bau_msg_header
*uv1_hdr
;
1680 struct uv2_bau_msg_header
*uv2_hdr
;
1681 struct bau_control
*bcp
;
1684 * each bau_desc is 64 bytes; there are 8 (ITEMS_PER_DESC)
1685 * per cpu; and one per cpu on the uvhub (ADP_SZ)
1687 dsize
= sizeof(struct bau_desc
) * ADP_SZ
* ITEMS_PER_DESC
;
1688 bau_desc
= kmalloc_node(dsize
, GFP_KERNEL
, node
);
1691 gpa
= uv_gpa(bau_desc
);
1692 n
= uv_gpa_to_gnode(gpa
);
1693 m
= uv_gpa_to_offset(gpa
);
1697 /* the 14-bit pnode */
1698 write_mmr_descriptor_base(pnode
, (n
<< UV_DESC_PSHIFT
| m
));
1700 * Initializing all 8 (ITEMS_PER_DESC) descriptors for each
1701 * cpu even though we only use the first one; one descriptor can
1702 * describe a broadcast to 256 uv hubs.
1704 for (i
= 0, bd2
= bau_desc
; i
< (ADP_SZ
* ITEMS_PER_DESC
); i
++, bd2
++) {
1705 memset(bd2
, 0, sizeof(struct bau_desc
));
1707 uv1_hdr
= &bd2
->header
.uv1_hdr
;
1708 uv1_hdr
->swack_flag
= 1;
1710 * The base_dest_nasid set in the message header
1711 * is the nasid of the first uvhub in the partition.
1712 * The bit map will indicate destination pnode numbers
1713 * relative to that base. They may not be consecutive
1714 * if nasid striding is being used.
1716 uv1_hdr
->base_dest_nasid
=
1717 UV_PNODE_TO_NASID(base_pnode
);
1718 uv1_hdr
->dest_subnodeid
= UV_LB_SUBNODEID
;
1719 uv1_hdr
->command
= UV_NET_ENDPOINT_INTD
;
1720 uv1_hdr
->int_both
= 1;
1722 * all others need to be set to zero:
1723 * fairness chaining multilevel count replied_to
1727 * BIOS uses legacy mode, but UV2 hardware always
1728 * uses native mode for selective broadcasts.
1730 uv2_hdr
= &bd2
->header
.uv2_hdr
;
1731 uv2_hdr
->swack_flag
= 1;
1732 uv2_hdr
->base_dest_nasid
=
1733 UV_PNODE_TO_NASID(base_pnode
);
1734 uv2_hdr
->dest_subnodeid
= UV_LB_SUBNODEID
;
1735 uv2_hdr
->command
= UV_NET_ENDPOINT_INTD
;
1738 for_each_present_cpu(cpu
) {
1739 if (pnode
!= uv_blade_to_pnode(uv_cpu_to_blade_id(cpu
)))
1741 bcp
= &per_cpu(bau_control
, cpu
);
1742 bcp
->descriptor_base
= bau_desc
;
1747 * initialize the destination side's receiving buffers
1748 * entered for each uvhub in the partition
1749 * - node is first node (kernel memory notion) on the uvhub
1750 * - pnode is the uvhub's physical identifier
1752 static void pq_init(int node
, int pnode
)
1759 unsigned long first
;
1760 unsigned long pn_first
;
1762 struct bau_pq_entry
*pqp
;
1763 struct bau_control
*bcp
;
1765 plsize
= (DEST_Q_SIZE
+ 1) * sizeof(struct bau_pq_entry
);
1766 vp
= kmalloc_node(plsize
, GFP_KERNEL
, node
);
1767 pqp
= (struct bau_pq_entry
*)vp
;
1770 cp
= (char *)pqp
+ 31;
1771 pqp
= (struct bau_pq_entry
*)(((unsigned long)cp
>> 5) << 5);
1773 for_each_present_cpu(cpu
) {
1774 if (pnode
!= uv_cpu_to_pnode(cpu
))
1776 /* for every cpu on this pnode: */
1777 bcp
= &per_cpu(bau_control
, cpu
);
1778 bcp
->queue_first
= pqp
;
1779 bcp
->bau_msg_head
= pqp
;
1780 bcp
->queue_last
= pqp
+ (DEST_Q_SIZE
- 1);
1783 * need the gnode of where the memory was really allocated
1785 pn
= uv_gpa_to_gnode(uv_gpa(pqp
));
1786 first
= uv_physnodeaddr(pqp
);
1787 pn_first
= ((unsigned long)pn
<< UV_PAYLOADQ_PNODE_SHIFT
) | first
;
1788 last
= uv_physnodeaddr(pqp
+ (DEST_Q_SIZE
- 1));
1789 write_mmr_payload_first(pnode
, pn_first
);
1790 write_mmr_payload_tail(pnode
, first
);
1791 write_mmr_payload_last(pnode
, last
);
1792 write_gmmr_sw_ack(pnode
, 0xffffUL
);
1794 /* in effect, all msg_type's are set to MSG_NOOP */
1795 memset(pqp
, 0, sizeof(struct bau_pq_entry
) * DEST_Q_SIZE
);
1799 * Initialization of each UV hub's structures
1801 static void __init
init_uvhub(int uvhub
, int vector
, int base_pnode
)
1805 unsigned long apicid
;
1807 node
= uvhub_to_first_node(uvhub
);
1808 pnode
= uv_blade_to_pnode(uvhub
);
1810 activation_descriptor_init(node
, pnode
, base_pnode
);
1812 pq_init(node
, pnode
);
1814 * The below initialization can't be in firmware because the
1815 * messaging IRQ will be determined by the OS.
1817 apicid
= uvhub_to_first_apicid(uvhub
) | uv_apicid_hibits
;
1818 write_mmr_data_config(pnode
, ((apicid
<< 32) | vector
));
1822 * We will set BAU_MISC_CONTROL with a timeout period.
1823 * But the BIOS has set UVH_AGING_PRESCALE_SEL and UVH_TRANSACTION_TIMEOUT.
1824 * So the destination timeout period has to be calculated from them.
1826 static int calculate_destination_timeout(void)
1828 unsigned long mmr_image
;
1834 unsigned long ts_ns
;
1837 mult1
= SOFTACK_TIMEOUT_PERIOD
& BAU_MISC_CONTROL_MULT_MASK
;
1838 mmr_image
= uv_read_local_mmr(UVH_AGING_PRESCALE_SEL
);
1839 index
= (mmr_image
>> BAU_URGENCY_7_SHIFT
) & BAU_URGENCY_7_MASK
;
1840 mmr_image
= uv_read_local_mmr(UVH_TRANSACTION_TIMEOUT
);
1841 mult2
= (mmr_image
>> BAU_TRANS_SHIFT
) & BAU_TRANS_MASK
;
1842 ts_ns
= timeout_base_ns
[index
];
1843 ts_ns
*= (mult1
* mult2
);
1846 /* 4 bits 0/1 for 10/80us base, 3 bits of multiplier */
1847 mmr_image
= uv_read_local_mmr(UVH_LB_BAU_MISC_CONTROL
);
1848 mmr_image
= (mmr_image
& UV_SA_MASK
) >> UV_SA_SHFT
;
1849 if (mmr_image
& (1L << UV2_ACK_UNITS_SHFT
))
1853 mult1
= mmr_image
& UV2_ACK_MASK
;
1859 static void __init
init_per_cpu_tunables(void)
1862 struct bau_control
*bcp
;
1864 for_each_present_cpu(cpu
) {
1865 bcp
= &per_cpu(bau_control
, cpu
);
1866 bcp
->baudisabled
= 0;
1869 bcp
->statp
= &per_cpu(ptcstats
, cpu
);
1870 /* time interval to catch a hardware stay-busy bug */
1871 bcp
->timeout_interval
= usec_2_cycles(2*timeout_us
);
1872 bcp
->max_concurr
= max_concurr
;
1873 bcp
->max_concurr_const
= max_concurr
;
1874 bcp
->plugged_delay
= plugged_delay
;
1875 bcp
->plugsb4reset
= plugsb4reset
;
1876 bcp
->timeoutsb4reset
= timeoutsb4reset
;
1877 bcp
->ipi_reset_limit
= ipi_reset_limit
;
1878 bcp
->complete_threshold
= complete_threshold
;
1879 bcp
->cong_response_us
= congested_respns_us
;
1880 bcp
->cong_reps
= congested_reps
;
1881 bcp
->disabled_period
= sec_2_cycles(disabled_period
);
1882 bcp
->giveup_limit
= giveup_limit
;
1883 spin_lock_init(&bcp
->queue_lock
);
1884 spin_lock_init(&bcp
->uvhub_lock
);
1885 spin_lock_init(&bcp
->disable_lock
);
1890 * Scan all cpus to collect blade and socket summaries.
1892 static int __init
get_cpu_topology(int base_pnode
,
1893 struct uvhub_desc
*uvhub_descs
,
1894 unsigned char *uvhub_mask
)
1900 struct bau_control
*bcp
;
1901 struct uvhub_desc
*bdp
;
1902 struct socket_desc
*sdp
;
1904 for_each_present_cpu(cpu
) {
1905 bcp
= &per_cpu(bau_control
, cpu
);
1907 memset(bcp
, 0, sizeof(struct bau_control
));
1909 pnode
= uv_cpu_hub_info(cpu
)->pnode
;
1910 if ((pnode
- base_pnode
) >= UV_DISTRIBUTION_SIZE
) {
1912 "cpu %d pnode %d-%d beyond %d; BAU disabled\n",
1913 cpu
, pnode
, base_pnode
, UV_DISTRIBUTION_SIZE
);
1917 bcp
->osnode
= cpu_to_node(cpu
);
1918 bcp
->partition_base_pnode
= base_pnode
;
1920 uvhub
= uv_cpu_hub_info(cpu
)->numa_blade_id
;
1921 *(uvhub_mask
+ (uvhub
/8)) |= (1 << (uvhub
%8));
1922 bdp
= &uvhub_descs
[uvhub
];
1928 /* kludge: 'assuming' one node per socket, and assuming that
1929 disabling a socket just leaves a gap in node numbers */
1930 socket
= bcp
->osnode
& 1;
1931 bdp
->socket_mask
|= (1 << socket
);
1932 sdp
= &bdp
->socket
[socket
];
1933 sdp
->cpu_number
[sdp
->num_cpus
] = cpu
;
1935 if (sdp
->num_cpus
> MAX_CPUS_PER_SOCKET
) {
1936 printk(KERN_EMERG
"%d cpus per socket invalid\n",
1945 * Each socket is to get a local array of pnodes/hubs.
1947 static void make_per_cpu_thp(struct bau_control
*smaster
)
1950 size_t hpsz
= sizeof(struct hub_and_pnode
) * num_possible_cpus();
1952 smaster
->thp
= kmalloc_node(hpsz
, GFP_KERNEL
, smaster
->osnode
);
1953 memset(smaster
->thp
, 0, hpsz
);
1954 for_each_present_cpu(cpu
) {
1955 smaster
->thp
[cpu
].pnode
= uv_cpu_hub_info(cpu
)->pnode
;
1956 smaster
->thp
[cpu
].uvhub
= uv_cpu_hub_info(cpu
)->numa_blade_id
;
1961 * Each uvhub is to get a local cpumask.
1963 static void make_per_hub_cpumask(struct bau_control
*hmaster
)
1965 int sz
= sizeof(cpumask_t
);
1967 hmaster
->cpumask
= kzalloc_node(sz
, GFP_KERNEL
, hmaster
->osnode
);
1971 * Initialize all the per_cpu information for the cpu's on a given socket,
1972 * given what has been gathered into the socket_desc struct.
1973 * And reports the chosen hub and socket masters back to the caller.
1975 static int scan_sock(struct socket_desc
*sdp
, struct uvhub_desc
*bdp
,
1976 struct bau_control
**smasterp
,
1977 struct bau_control
**hmasterp
)
1981 struct bau_control
*bcp
;
1983 for (i
= 0; i
< sdp
->num_cpus
; i
++) {
1984 cpu
= sdp
->cpu_number
[i
];
1985 bcp
= &per_cpu(bau_control
, cpu
);
1992 bcp
->cpus_in_uvhub
= bdp
->num_cpus
;
1993 bcp
->cpus_in_socket
= sdp
->num_cpus
;
1994 bcp
->socket_master
= *smasterp
;
1995 bcp
->uvhub
= bdp
->uvhub
;
1997 bcp
->uvhub_version
= 1;
1998 else if (is_uv2_hub())
1999 bcp
->uvhub_version
= 2;
2001 printk(KERN_EMERG
"uvhub version not 1 or 2\n");
2004 bcp
->uvhub_master
= *hmasterp
;
2005 bcp
->uvhub_cpu
= uv_cpu_hub_info(cpu
)->blade_processor_id
;
2006 if (bcp
->uvhub_cpu
>= MAX_CPUS_PER_UVHUB
) {
2007 printk(KERN_EMERG
"%d cpus per uvhub invalid\n",
2016 * Summarize the blade and socket topology into the per_cpu structures.
2018 static int __init
summarize_uvhub_sockets(int nuvhubs
,
2019 struct uvhub_desc
*uvhub_descs
,
2020 unsigned char *uvhub_mask
)
2024 unsigned short socket_mask
;
2026 for (uvhub
= 0; uvhub
< nuvhubs
; uvhub
++) {
2027 struct uvhub_desc
*bdp
;
2028 struct bau_control
*smaster
= NULL
;
2029 struct bau_control
*hmaster
= NULL
;
2031 if (!(*(uvhub_mask
+ (uvhub
/8)) & (1 << (uvhub
%8))))
2034 bdp
= &uvhub_descs
[uvhub
];
2035 socket_mask
= bdp
->socket_mask
;
2037 while (socket_mask
) {
2038 struct socket_desc
*sdp
;
2039 if ((socket_mask
& 1)) {
2040 sdp
= &bdp
->socket
[socket
];
2041 if (scan_sock(sdp
, bdp
, &smaster
, &hmaster
))
2043 make_per_cpu_thp(smaster
);
2046 socket_mask
= (socket_mask
>> 1);
2048 make_per_hub_cpumask(hmaster
);
2054 * initialize the bau_control structure for each cpu
2056 static int __init
init_per_cpu(int nuvhubs
, int base_part_pnode
)
2058 unsigned char *uvhub_mask
;
2060 struct uvhub_desc
*uvhub_descs
;
2062 timeout_us
= calculate_destination_timeout();
2064 vp
= kmalloc(nuvhubs
* sizeof(struct uvhub_desc
), GFP_KERNEL
);
2065 uvhub_descs
= (struct uvhub_desc
*)vp
;
2066 memset(uvhub_descs
, 0, nuvhubs
* sizeof(struct uvhub_desc
));
2067 uvhub_mask
= kzalloc((nuvhubs
+7)/8, GFP_KERNEL
);
2069 if (get_cpu_topology(base_part_pnode
, uvhub_descs
, uvhub_mask
))
2072 if (summarize_uvhub_sockets(nuvhubs
, uvhub_descs
, uvhub_mask
))
2077 init_per_cpu_tunables();
2087 * Initialization of BAU-related structures
2089 static int __init
uv_bau_init(void)
2097 cpumask_var_t
*mask
;
2099 if (!is_uv_system())
2102 for_each_possible_cpu(cur_cpu
) {
2103 mask
= &per_cpu(uv_flush_tlb_mask
, cur_cpu
);
2104 zalloc_cpumask_var_node(mask
, GFP_KERNEL
, cpu_to_node(cur_cpu
));
2107 nuvhubs
= uv_num_possible_blades();
2108 congested_cycles
= usec_2_cycles(congested_respns_us
);
2110 uv_base_pnode
= 0x7fffffff;
2111 for (uvhub
= 0; uvhub
< nuvhubs
; uvhub
++) {
2112 cpus
= uv_blade_nr_possible_cpus(uvhub
);
2113 if (cpus
&& (uv_blade_to_pnode(uvhub
) < uv_base_pnode
))
2114 uv_base_pnode
= uv_blade_to_pnode(uvhub
);
2119 if (init_per_cpu(nuvhubs
, uv_base_pnode
)) {
2125 vector
= UV_BAU_MESSAGE
;
2126 for_each_possible_blade(uvhub
)
2127 if (uv_blade_nr_possible_cpus(uvhub
))
2128 init_uvhub(uvhub
, vector
, uv_base_pnode
);
2130 alloc_intr_gate(vector
, uv_bau_message_intr1
);
2132 for_each_possible_blade(uvhub
) {
2133 if (uv_blade_nr_possible_cpus(uvhub
)) {
2136 pnode
= uv_blade_to_pnode(uvhub
);
2139 write_gmmr_activation(pnode
, val
);
2140 mmr
= 1; /* should be 1 to broadcast to both sockets */
2142 write_mmr_data_broadcast(pnode
, mmr
);
2148 core_initcall(uv_bau_init
);
2149 fs_initcall(uv_ptc_init
);