2 * SGI UltraViolet TLB flush routines.
4 * (c) 2008-2014 Cliff Wickman <cpw@sgi.com>, SGI.
6 * This code is released under the GNU General Public License version 2 or
9 #include <linux/seq_file.h>
10 #include <linux/proc_fs.h>
11 #include <linux/debugfs.h>
12 #include <linux/kernel.h>
13 #include <linux/slab.h>
14 #include <linux/delay.h>
16 #include <asm/mmu_context.h>
17 #include <asm/uv/uv.h>
18 #include <asm/uv/uv_mmrs.h>
19 #include <asm/uv/uv_hub.h>
20 #include <asm/uv/uv_bau.h>
23 #include <asm/irq_vectors.h>
24 #include <asm/timer.h>
26 static struct bau_operations ops __ro_after_init
;
28 /* timeouts in nanoseconds (indexed by UVH_AGING_PRESCALE_SEL urgency7 30:28) */
29 static int timeout_base_ns
[] = {
40 static int timeout_us
;
41 static bool nobau
= true;
42 static int nobau_perm
;
43 static cycles_t congested_cycles
;
46 static int max_concurr
= MAX_BAU_CONCURRENT
;
47 static int max_concurr_const
= MAX_BAU_CONCURRENT
;
48 static int plugged_delay
= PLUGGED_DELAY
;
49 static int plugsb4reset
= PLUGSB4RESET
;
50 static int giveup_limit
= GIVEUP_LIMIT
;
51 static int timeoutsb4reset
= TIMEOUTSB4RESET
;
52 static int ipi_reset_limit
= IPI_RESET_LIMIT
;
53 static int complete_threshold
= COMPLETE_THRESHOLD
;
54 static int congested_respns_us
= CONGESTED_RESPONSE_US
;
55 static int congested_reps
= CONGESTED_REPS
;
56 static int disabled_period
= DISABLED_PERIOD
;
58 static struct tunables tunables
[] = {
59 {&max_concurr
, MAX_BAU_CONCURRENT
}, /* must be [0] */
60 {&plugged_delay
, PLUGGED_DELAY
},
61 {&plugsb4reset
, PLUGSB4RESET
},
62 {&timeoutsb4reset
, TIMEOUTSB4RESET
},
63 {&ipi_reset_limit
, IPI_RESET_LIMIT
},
64 {&complete_threshold
, COMPLETE_THRESHOLD
},
65 {&congested_respns_us
, CONGESTED_RESPONSE_US
},
66 {&congested_reps
, CONGESTED_REPS
},
67 {&disabled_period
, DISABLED_PERIOD
},
68 {&giveup_limit
, GIVEUP_LIMIT
}
71 static struct dentry
*tunables_dir
;
72 static struct dentry
*tunables_file
;
74 /* these correspond to the statistics printed by ptc_seq_show() */
75 static char *stat_description
[] = {
76 "sent: number of shootdown messages sent",
77 "stime: time spent sending messages",
78 "numuvhubs: number of hubs targeted with shootdown",
79 "numuvhubs16: number times 16 or more hubs targeted",
80 "numuvhubs8: number times 8 or more hubs targeted",
81 "numuvhubs4: number times 4 or more hubs targeted",
82 "numuvhubs2: number times 2 or more hubs targeted",
83 "numuvhubs1: number times 1 hub targeted",
84 "numcpus: number of cpus targeted with shootdown",
85 "dto: number of destination timeouts",
86 "retries: destination timeout retries sent",
87 "rok: : destination timeouts successfully retried",
88 "resetp: ipi-style resource resets for plugs",
89 "resett: ipi-style resource resets for timeouts",
90 "giveup: fall-backs to ipi-style shootdowns",
91 "sto: number of source timeouts",
92 "bz: number of stay-busy's",
93 "throt: number times spun in throttle",
94 "swack: image of UVH_LB_BAU_INTD_SOFTWARE_ACKNOWLEDGE",
95 "recv: shootdown messages received",
96 "rtime: time spent processing messages",
97 "all: shootdown all-tlb messages",
98 "one: shootdown one-tlb messages",
99 "mult: interrupts that found multiple messages",
100 "none: interrupts that found no messages",
101 "retry: number of retry messages processed",
102 "canc: number messages canceled by retries",
103 "nocan: number retries that found nothing to cancel",
104 "reset: number of ipi-style reset requests processed",
105 "rcan: number messages canceled by reset requests",
106 "disable: number times use of the BAU was disabled",
107 "enable: number times use of the BAU was re-enabled"
110 static int __init
setup_bau(char *arg
)
117 result
= strtobool(arg
, &nobau
);
121 /* we need to flip the logic here, so that bau=y sets nobau to false */
125 pr_info("UV BAU Enabled\n");
127 pr_info("UV BAU Disabled\n");
131 early_param("bau", setup_bau
);
133 /* base pnode in this partition */
134 static int uv_base_pnode __read_mostly
;
136 static DEFINE_PER_CPU(struct ptc_stats
, ptcstats
);
137 static DEFINE_PER_CPU(struct bau_control
, bau_control
);
138 static DEFINE_PER_CPU(cpumask_var_t
, uv_flush_tlb_mask
);
144 struct bau_control
*bcp
;
147 pr_info("BAU not initialized; cannot be turned on\n");
151 for_each_present_cpu(cpu
) {
152 bcp
= &per_cpu(bau_control
, cpu
);
155 pr_info("BAU turned on\n");
163 struct bau_control
*bcp
;
166 for_each_present_cpu(cpu
) {
167 bcp
= &per_cpu(bau_control
, cpu
);
170 pr_info("BAU turned off\n");
175 * Determine the first node on a uvhub. 'Nodes' are used for kernel
178 static int __init
uvhub_to_first_node(int uvhub
)
182 for_each_online_node(node
) {
183 b
= uv_node_to_blade_id(node
);
191 * Determine the apicid of the first cpu on a uvhub.
193 static int __init
uvhub_to_first_apicid(int uvhub
)
197 for_each_present_cpu(cpu
)
198 if (uvhub
== uv_cpu_to_blade_id(cpu
))
199 return per_cpu(x86_cpu_to_apicid
, cpu
);
204 * Free a software acknowledge hardware resource by clearing its Pending
205 * bit. This will return a reply to the sender.
206 * If the message has timed out, a reply has already been sent by the
207 * hardware but the resource has not been released. In that case our
208 * clear of the Timeout bit (as well) will free the resource. No reply will
209 * be sent (the hardware will only do one reply per message).
211 static void reply_to_message(struct msg_desc
*mdp
, struct bau_control
*bcp
,
215 struct bau_pq_entry
*msg
;
218 if (!msg
->canceled
&& do_acknowledge
) {
219 dw
= (msg
->swack_vec
<< UV_SW_ACK_NPENDING
) | msg
->swack_vec
;
220 ops
.write_l_sw_ack(dw
);
227 * Process the receipt of a RETRY message
229 static void bau_process_retry_msg(struct msg_desc
*mdp
,
230 struct bau_control
*bcp
)
233 int cancel_count
= 0;
234 unsigned long msg_res
;
235 unsigned long mmr
= 0;
236 struct bau_pq_entry
*msg
= mdp
->msg
;
237 struct bau_pq_entry
*msg2
;
238 struct ptc_stats
*stat
= bcp
->statp
;
242 * cancel any message from msg+1 to the retry itself
244 for (msg2
= msg
+1, i
= 0; i
< DEST_Q_SIZE
; msg2
++, i
++) {
245 if (msg2
> mdp
->queue_last
)
246 msg2
= mdp
->queue_first
;
250 /* same conditions for cancellation as do_reset */
251 if ((msg2
->replied_to
== 0) && (msg2
->canceled
== 0) &&
252 (msg2
->swack_vec
) && ((msg2
->swack_vec
&
253 msg
->swack_vec
) == 0) &&
254 (msg2
->sending_cpu
== msg
->sending_cpu
) &&
255 (msg2
->msg_type
!= MSG_NOOP
)) {
256 mmr
= ops
.read_l_sw_ack();
257 msg_res
= msg2
->swack_vec
;
259 * This is a message retry; clear the resources held
260 * by the previous message only if they timed out.
261 * If it has not timed out we have an unexpected
262 * situation to report.
264 if (mmr
& (msg_res
<< UV_SW_ACK_NPENDING
)) {
267 * Is the resource timed out?
268 * Make everyone ignore the cancelled message.
273 mr
= (msg_res
<< UV_SW_ACK_NPENDING
) | msg_res
;
274 ops
.write_l_sw_ack(mr
);
279 stat
->d_nocanceled
++;
283 * Do all the things a cpu should do for a TLB shootdown message.
284 * Other cpu's may come here at the same time for this message.
286 static void bau_process_message(struct msg_desc
*mdp
, struct bau_control
*bcp
,
289 short socket_ack_count
= 0;
291 struct atomic_short
*asp
;
292 struct ptc_stats
*stat
= bcp
->statp
;
293 struct bau_pq_entry
*msg
= mdp
->msg
;
294 struct bau_control
*smaster
= bcp
->socket_master
;
297 * This must be a normal message, or retry of a normal message
299 if (msg
->address
== TLB_FLUSH_ALL
) {
303 __flush_tlb_one(msg
->address
);
309 * One cpu on each uvhub has the additional job on a RETRY
310 * of releasing the resource held by the message that is
311 * being retried. That message is identified by sending
314 if (msg
->msg_type
== MSG_RETRY
&& bcp
== bcp
->uvhub_master
)
315 bau_process_retry_msg(mdp
, bcp
);
318 * This is a swack message, so we have to reply to it.
319 * Count each responding cpu on the socket. This avoids
320 * pinging the count's cache line back and forth between
323 sp
= &smaster
->socket_acknowledge_count
[mdp
->msg_slot
];
324 asp
= (struct atomic_short
*)sp
;
325 socket_ack_count
= atom_asr(1, asp
);
326 if (socket_ack_count
== bcp
->cpus_in_socket
) {
329 * Both sockets dump their completed count total into
330 * the message's count.
333 asp
= (struct atomic_short
*)&msg
->acknowledge_count
;
334 msg_ack_count
= atom_asr(socket_ack_count
, asp
);
336 if (msg_ack_count
== bcp
->cpus_in_uvhub
) {
338 * All cpus in uvhub saw it; reply
339 * (unless we are in the UV2 workaround)
341 reply_to_message(mdp
, bcp
, do_acknowledge
);
349 * Determine the first cpu on a pnode.
351 static int pnode_to_first_cpu(int pnode
, struct bau_control
*smaster
)
354 struct hub_and_pnode
*hpp
;
356 for_each_present_cpu(cpu
) {
357 hpp
= &smaster
->thp
[cpu
];
358 if (pnode
== hpp
->pnode
)
365 * Last resort when we get a large number of destination timeouts is
366 * to clear resources held by a given cpu.
367 * Do this with IPI so that all messages in the BAU message queue
368 * can be identified by their nonzero swack_vec field.
370 * This is entered for a single cpu on the uvhub.
371 * The sender want's this uvhub to free a specific message's
374 static void do_reset(void *ptr
)
377 struct bau_control
*bcp
= &per_cpu(bau_control
, smp_processor_id());
378 struct reset_args
*rap
= (struct reset_args
*)ptr
;
379 struct bau_pq_entry
*msg
;
380 struct ptc_stats
*stat
= bcp
->statp
;
384 * We're looking for the given sender, and
385 * will free its swack resource.
386 * If all cpu's finally responded after the timeout, its
387 * message 'replied_to' was set.
389 for (msg
= bcp
->queue_first
, i
= 0; i
< DEST_Q_SIZE
; msg
++, i
++) {
390 unsigned long msg_res
;
391 /* do_reset: same conditions for cancellation as
392 bau_process_retry_msg() */
393 if ((msg
->replied_to
== 0) &&
394 (msg
->canceled
== 0) &&
395 (msg
->sending_cpu
== rap
->sender
) &&
397 (msg
->msg_type
!= MSG_NOOP
)) {
401 * make everyone else ignore this message
405 * only reset the resource if it is still pending
407 mmr
= ops
.read_l_sw_ack();
408 msg_res
= msg
->swack_vec
;
409 mr
= (msg_res
<< UV_SW_ACK_NPENDING
) | msg_res
;
412 ops
.write_l_sw_ack(mr
);
420 * Use IPI to get all target uvhubs to release resources held by
421 * a given sending cpu number.
423 static void reset_with_ipi(struct pnmask
*distribution
, struct bau_control
*bcp
)
428 int sender
= bcp
->cpu
;
429 cpumask_t
*mask
= bcp
->uvhub_master
->cpumask
;
430 struct bau_control
*smaster
= bcp
->socket_master
;
431 struct reset_args reset_args
;
433 reset_args
.sender
= sender
;
435 /* find a single cpu for each uvhub in this distribution mask */
436 maskbits
= sizeof(struct pnmask
) * BITSPERBYTE
;
437 /* each bit is a pnode relative to the partition base pnode */
438 for (pnode
= 0; pnode
< maskbits
; pnode
++) {
440 if (!bau_uvhub_isset(pnode
, distribution
))
442 apnode
= pnode
+ bcp
->partition_base_pnode
;
443 cpu
= pnode_to_first_cpu(apnode
, smaster
);
444 cpumask_set_cpu(cpu
, mask
);
447 /* IPI all cpus; preemption is already disabled */
448 smp_call_function_many(mask
, do_reset
, (void *)&reset_args
, 1);
453 * Not to be confused with cycles_2_ns() from tsc.c; this gives a relative
454 * number, not an absolute. It converts a duration in cycles to a duration in
457 static inline unsigned long long cycles_2_ns(unsigned long long cyc
)
459 struct cyc2ns_data data
;
460 unsigned long long ns
;
462 cyc2ns_read_begin(&data
);
463 ns
= mul_u64_u32_shr(cyc
, data
.cyc2ns_mul
, data
.cyc2ns_shift
);
470 * The reverse of the above; converts a duration in ns to a duration in cycles.
472 static inline unsigned long long ns_2_cycles(unsigned long long ns
)
474 struct cyc2ns_data data
;
475 unsigned long long cyc
;
477 cyc2ns_read_begin(&data
);
478 cyc
= (ns
<< data
.cyc2ns_shift
) / data
.cyc2ns_mul
;
484 static inline unsigned long cycles_2_us(unsigned long long cyc
)
486 return cycles_2_ns(cyc
) / NSEC_PER_USEC
;
489 static inline cycles_t
sec_2_cycles(unsigned long sec
)
491 return ns_2_cycles(sec
* NSEC_PER_SEC
);
494 static inline unsigned long long usec_2_cycles(unsigned long usec
)
496 return ns_2_cycles(usec
* NSEC_PER_USEC
);
500 * wait for all cpus on this hub to finish their sends and go quiet
501 * leaves uvhub_quiesce set so that no new broadcasts are started by
502 * bau_flush_send_and_wait()
504 static inline void quiesce_local_uvhub(struct bau_control
*hmaster
)
506 atom_asr(1, (struct atomic_short
*)&hmaster
->uvhub_quiesce
);
510 * mark this quiet-requestor as done
512 static inline void end_uvhub_quiesce(struct bau_control
*hmaster
)
514 atom_asr(-1, (struct atomic_short
*)&hmaster
->uvhub_quiesce
);
517 static unsigned long uv1_read_status(unsigned long mmr_offset
, int right_shift
)
519 unsigned long descriptor_status
;
521 descriptor_status
= uv_read_local_mmr(mmr_offset
);
522 descriptor_status
>>= right_shift
;
523 descriptor_status
&= UV_ACT_STATUS_MASK
;
524 return descriptor_status
;
528 * Wait for completion of a broadcast software ack message
529 * return COMPLETE, RETRY(PLUGGED or TIMEOUT) or GIVEUP
531 static int uv1_wait_completion(struct bau_desc
*bau_desc
,
532 struct bau_control
*bcp
, long try)
534 unsigned long descriptor_status
;
536 u64 mmr_offset
= bcp
->status_mmr
;
537 int right_shift
= bcp
->status_index
;
538 struct ptc_stats
*stat
= bcp
->statp
;
540 descriptor_status
= uv1_read_status(mmr_offset
, right_shift
);
541 /* spin on the status MMR, waiting for it to go idle */
542 while ((descriptor_status
!= DS_IDLE
)) {
544 * Our software ack messages may be blocked because
545 * there are no swack resources available. As long
546 * as none of them has timed out hardware will NACK
547 * our message and its state will stay IDLE.
549 if (descriptor_status
== DS_SOURCE_TIMEOUT
) {
552 } else if (descriptor_status
== DS_DESTINATION_TIMEOUT
) {
557 * Our retries may be blocked by all destination
558 * swack resources being consumed, and a timeout
559 * pending. In that case hardware returns the
560 * ERROR that looks like a destination timeout.
562 if (cycles_2_us(ttm
- bcp
->send_message
) < timeout_us
) {
563 bcp
->conseccompletes
= 0;
564 return FLUSH_RETRY_PLUGGED
;
567 bcp
->conseccompletes
= 0;
568 return FLUSH_RETRY_TIMEOUT
;
571 * descriptor_status is still BUSY
575 descriptor_status
= uv1_read_status(mmr_offset
, right_shift
);
577 bcp
->conseccompletes
++;
578 return FLUSH_COMPLETE
;
582 * UV2 could have an extra bit of status in the ACTIVATION_STATUS_2 register.
583 * But not currently used.
585 static unsigned long uv2_3_read_status(unsigned long offset
, int rshft
, int desc
)
587 return ((read_lmmr(offset
) >> rshft
) & UV_ACT_STATUS_MASK
) << 1;
591 * Entered when a bau descriptor has gone into a permanent busy wait because
593 * Workaround the bug.
595 static int handle_uv2_busy(struct bau_control
*bcp
)
597 struct ptc_stats
*stat
= bcp
->statp
;
604 static int uv2_3_wait_completion(struct bau_desc
*bau_desc
,
605 struct bau_control
*bcp
, long try)
607 unsigned long descriptor_stat
;
609 u64 mmr_offset
= bcp
->status_mmr
;
610 int right_shift
= bcp
->status_index
;
611 int desc
= bcp
->uvhub_cpu
;
613 struct ptc_stats
*stat
= bcp
->statp
;
615 descriptor_stat
= uv2_3_read_status(mmr_offset
, right_shift
, desc
);
617 /* spin on the status MMR, waiting for it to go idle */
618 while (descriptor_stat
!= UV2H_DESC_IDLE
) {
619 if ((descriptor_stat
== UV2H_DESC_SOURCE_TIMEOUT
)) {
621 * A h/w bug on the destination side may
622 * have prevented the message being marked
623 * pending, thus it doesn't get replied to
624 * and gets continually nacked until it times
625 * out with a SOURCE_TIMEOUT.
629 } else if (descriptor_stat
== UV2H_DESC_DEST_TIMEOUT
) {
633 * Our retries may be blocked by all destination
634 * swack resources being consumed, and a timeout
635 * pending. In that case hardware returns the
636 * ERROR that looks like a destination timeout.
637 * Without using the extended status we have to
638 * deduce from the short time that this was a
641 if (cycles_2_us(ttm
- bcp
->send_message
) < timeout_us
) {
642 bcp
->conseccompletes
= 0;
644 /* FLUSH_RETRY_PLUGGED causes hang on boot */
648 bcp
->conseccompletes
= 0;
649 /* FLUSH_RETRY_TIMEOUT causes hang on boot */
653 if (busy_reps
> 1000000) {
654 /* not to hammer on the clock */
657 if ((ttm
- bcp
->send_message
) > bcp
->timeout_interval
)
658 return handle_uv2_busy(bcp
);
661 * descriptor_stat is still BUSY
665 descriptor_stat
= uv2_3_read_status(mmr_offset
, right_shift
, desc
);
667 bcp
->conseccompletes
++;
668 return FLUSH_COMPLETE
;
672 * Returns the status of current BAU message for cpu desc as a bit field
675 static u64
read_status(u64 status_mmr
, int index
, int desc
)
679 stat
= ((read_lmmr(status_mmr
) >> index
) & UV_ACT_STATUS_MASK
) << 1;
680 stat
|= (read_lmmr(UVH_LB_BAU_SB_ACTIVATION_STATUS_2
) >> desc
) & 0x1;
685 static int uv4_wait_completion(struct bau_desc
*bau_desc
,
686 struct bau_control
*bcp
, long try)
688 struct ptc_stats
*stat
= bcp
->statp
;
690 u64 mmr
= bcp
->status_mmr
;
691 int index
= bcp
->status_index
;
692 int desc
= bcp
->uvhub_cpu
;
694 descriptor_stat
= read_status(mmr
, index
, desc
);
696 /* spin on the status MMR, waiting for it to go idle */
697 while (descriptor_stat
!= UV2H_DESC_IDLE
) {
698 switch (descriptor_stat
) {
699 case UV2H_DESC_SOURCE_TIMEOUT
:
703 case UV2H_DESC_DEST_TIMEOUT
:
705 bcp
->conseccompletes
= 0;
706 return FLUSH_RETRY_TIMEOUT
;
708 case UV2H_DESC_DEST_STRONG_NACK
:
710 bcp
->conseccompletes
= 0;
711 return FLUSH_RETRY_PLUGGED
;
713 case UV2H_DESC_DEST_PUT_ERR
:
714 bcp
->conseccompletes
= 0;
718 /* descriptor_stat is still BUSY */
721 descriptor_stat
= read_status(mmr
, index
, desc
);
723 bcp
->conseccompletes
++;
724 return FLUSH_COMPLETE
;
728 * Our retries are blocked by all destination sw ack resources being
729 * in use, and a timeout is pending. In that case hardware immediately
730 * returns the ERROR that looks like a destination timeout.
732 static void destination_plugged(struct bau_desc
*bau_desc
,
733 struct bau_control
*bcp
,
734 struct bau_control
*hmaster
, struct ptc_stats
*stat
)
736 udelay(bcp
->plugged_delay
);
737 bcp
->plugged_tries
++;
739 if (bcp
->plugged_tries
>= bcp
->plugsb4reset
) {
740 bcp
->plugged_tries
= 0;
742 quiesce_local_uvhub(hmaster
);
744 spin_lock(&hmaster
->queue_lock
);
745 reset_with_ipi(&bau_desc
->distribution
, bcp
);
746 spin_unlock(&hmaster
->queue_lock
);
748 end_uvhub_quiesce(hmaster
);
751 stat
->s_resets_plug
++;
755 static void destination_timeout(struct bau_desc
*bau_desc
,
756 struct bau_control
*bcp
, struct bau_control
*hmaster
,
757 struct ptc_stats
*stat
)
759 hmaster
->max_concurr
= 1;
760 bcp
->timeout_tries
++;
761 if (bcp
->timeout_tries
>= bcp
->timeoutsb4reset
) {
762 bcp
->timeout_tries
= 0;
764 quiesce_local_uvhub(hmaster
);
766 spin_lock(&hmaster
->queue_lock
);
767 reset_with_ipi(&bau_desc
->distribution
, bcp
);
768 spin_unlock(&hmaster
->queue_lock
);
770 end_uvhub_quiesce(hmaster
);
773 stat
->s_resets_timeout
++;
778 * Stop all cpus on a uvhub from using the BAU for a period of time.
779 * This is reversed by check_enable.
781 static void disable_for_period(struct bau_control
*bcp
, struct ptc_stats
*stat
)
784 struct bau_control
*tbcp
;
785 struct bau_control
*hmaster
;
788 hmaster
= bcp
->uvhub_master
;
789 spin_lock(&hmaster
->disable_lock
);
790 if (!bcp
->baudisabled
) {
791 stat
->s_bau_disabled
++;
793 for_each_present_cpu(tcpu
) {
794 tbcp
= &per_cpu(bau_control
, tcpu
);
795 if (tbcp
->uvhub_master
== hmaster
) {
796 tbcp
->baudisabled
= 1;
797 tbcp
->set_bau_on_time
=
798 tm1
+ bcp
->disabled_period
;
802 spin_unlock(&hmaster
->disable_lock
);
805 static void count_max_concurr(int stat
, struct bau_control
*bcp
,
806 struct bau_control
*hmaster
)
808 bcp
->plugged_tries
= 0;
809 bcp
->timeout_tries
= 0;
810 if (stat
!= FLUSH_COMPLETE
)
812 if (bcp
->conseccompletes
<= bcp
->complete_threshold
)
814 if (hmaster
->max_concurr
>= hmaster
->max_concurr_const
)
816 hmaster
->max_concurr
++;
819 static void record_send_stats(cycles_t time1
, cycles_t time2
,
820 struct bau_control
*bcp
, struct ptc_stats
*stat
,
821 int completion_status
, int try)
826 elapsed
= time2
- time1
;
827 stat
->s_time
+= elapsed
;
829 if ((completion_status
== FLUSH_COMPLETE
) && (try == 1)) {
830 bcp
->period_requests
++;
831 bcp
->period_time
+= elapsed
;
832 if ((elapsed
> congested_cycles
) &&
833 (bcp
->period_requests
> bcp
->cong_reps
) &&
834 ((bcp
->period_time
/ bcp
->period_requests
) >
837 disable_for_period(bcp
, stat
);
843 if (completion_status
== FLUSH_COMPLETE
&& try > 1)
845 else if (completion_status
== FLUSH_GIVEUP
) {
847 if (get_cycles() > bcp
->period_end
)
848 bcp
->period_giveups
= 0;
849 bcp
->period_giveups
++;
850 if (bcp
->period_giveups
== 1)
851 bcp
->period_end
= get_cycles() + bcp
->disabled_period
;
852 if (bcp
->period_giveups
> bcp
->giveup_limit
) {
853 disable_for_period(bcp
, stat
);
854 stat
->s_giveuplimit
++;
860 * Because of a uv1 hardware bug only a limited number of concurrent
861 * requests can be made.
863 static void uv1_throttle(struct bau_control
*hmaster
, struct ptc_stats
*stat
)
865 spinlock_t
*lock
= &hmaster
->uvhub_lock
;
868 v
= &hmaster
->active_descriptor_count
;
869 if (!atomic_inc_unless_ge(lock
, v
, hmaster
->max_concurr
)) {
873 } while (!atomic_inc_unless_ge(lock
, v
, hmaster
->max_concurr
));
878 * Handle the completion status of a message send.
880 static void handle_cmplt(int completion_status
, struct bau_desc
*bau_desc
,
881 struct bau_control
*bcp
, struct bau_control
*hmaster
,
882 struct ptc_stats
*stat
)
884 if (completion_status
== FLUSH_RETRY_PLUGGED
)
885 destination_plugged(bau_desc
, bcp
, hmaster
, stat
);
886 else if (completion_status
== FLUSH_RETRY_TIMEOUT
)
887 destination_timeout(bau_desc
, bcp
, hmaster
, stat
);
891 * Send a broadcast and wait for it to complete.
893 * The flush_mask contains the cpus the broadcast is to be sent to including
894 * cpus that are on the local uvhub.
896 * Returns 0 if all flushing represented in the mask was done.
897 * Returns 1 if it gives up entirely and the original cpu mask is to be
898 * returned to the kernel.
900 static int uv_flush_send_and_wait(struct cpumask
*flush_mask
,
901 struct bau_control
*bcp
,
902 struct bau_desc
*bau_desc
)
905 int completion_stat
= 0;
911 struct ptc_stats
*stat
= bcp
->statp
;
912 struct bau_control
*hmaster
= bcp
->uvhub_master
;
913 struct uv1_bau_msg_header
*uv1_hdr
= NULL
;
914 struct uv2_3_bau_msg_header
*uv2_3_hdr
= NULL
;
916 if (bcp
->uvhub_version
== UV_BAU_V1
) {
918 uv1_throttle(hmaster
, stat
);
921 while (hmaster
->uvhub_quiesce
)
924 time1
= get_cycles();
926 uv1_hdr
= &bau_desc
->header
.uv1_hdr
;
929 uv2_3_hdr
= &bau_desc
->header
.uv2_3_hdr
;
934 uv1_hdr
->msg_type
= MSG_REGULAR
;
936 uv2_3_hdr
->msg_type
= MSG_REGULAR
;
937 seq_number
= bcp
->message_number
++;
940 uv1_hdr
->msg_type
= MSG_RETRY
;
942 uv2_3_hdr
->msg_type
= MSG_RETRY
;
943 stat
->s_retry_messages
++;
947 uv1_hdr
->sequence
= seq_number
;
949 uv2_3_hdr
->sequence
= seq_number
;
950 index
= (1UL << AS_PUSH_SHIFT
) | bcp
->uvhub_cpu
;
951 bcp
->send_message
= get_cycles();
953 write_mmr_activation(index
);
956 completion_stat
= ops
.wait_completion(bau_desc
, bcp
, try);
958 handle_cmplt(completion_stat
, bau_desc
, bcp
, hmaster
, stat
);
960 if (bcp
->ipi_attempts
>= bcp
->ipi_reset_limit
) {
961 bcp
->ipi_attempts
= 0;
962 stat
->s_overipilimit
++;
963 completion_stat
= FLUSH_GIVEUP
;
967 } while ((completion_stat
== FLUSH_RETRY_PLUGGED
) ||
968 (completion_stat
== FLUSH_RETRY_TIMEOUT
));
970 time2
= get_cycles();
972 count_max_concurr(completion_stat
, bcp
, hmaster
);
974 while (hmaster
->uvhub_quiesce
)
977 atomic_dec(&hmaster
->active_descriptor_count
);
979 record_send_stats(time1
, time2
, bcp
, stat
, completion_stat
, try);
981 if (completion_stat
== FLUSH_GIVEUP
)
982 /* FLUSH_GIVEUP will fall back to using IPI's for tlb flush */
988 * The BAU is disabled for this uvhub. When the disabled time period has
989 * expired re-enable it.
990 * Return 0 if it is re-enabled for all cpus on this uvhub.
992 static int check_enable(struct bau_control
*bcp
, struct ptc_stats
*stat
)
995 struct bau_control
*tbcp
;
996 struct bau_control
*hmaster
;
998 hmaster
= bcp
->uvhub_master
;
999 spin_lock(&hmaster
->disable_lock
);
1000 if (bcp
->baudisabled
&& (get_cycles() >= bcp
->set_bau_on_time
)) {
1001 stat
->s_bau_reenabled
++;
1002 for_each_present_cpu(tcpu
) {
1003 tbcp
= &per_cpu(bau_control
, tcpu
);
1004 if (tbcp
->uvhub_master
== hmaster
) {
1005 tbcp
->baudisabled
= 0;
1006 tbcp
->period_requests
= 0;
1007 tbcp
->period_time
= 0;
1008 tbcp
->period_giveups
= 0;
1011 spin_unlock(&hmaster
->disable_lock
);
1014 spin_unlock(&hmaster
->disable_lock
);
1018 static void record_send_statistics(struct ptc_stats
*stat
, int locals
, int hubs
,
1019 int remotes
, struct bau_desc
*bau_desc
)
1021 stat
->s_requestor
++;
1022 stat
->s_ntargcpu
+= remotes
+ locals
;
1023 stat
->s_ntargremotes
+= remotes
;
1024 stat
->s_ntarglocals
+= locals
;
1026 /* uvhub statistics */
1027 hubs
= bau_uvhub_weight(&bau_desc
->distribution
);
1029 stat
->s_ntarglocaluvhub
++;
1030 stat
->s_ntargremoteuvhub
+= (hubs
- 1);
1032 stat
->s_ntargremoteuvhub
+= hubs
;
1034 stat
->s_ntarguvhub
+= hubs
;
1037 stat
->s_ntarguvhub16
++;
1039 stat
->s_ntarguvhub8
++;
1041 stat
->s_ntarguvhub4
++;
1043 stat
->s_ntarguvhub2
++;
1045 stat
->s_ntarguvhub1
++;
1049 * Translate a cpu mask to the uvhub distribution mask in the BAU
1050 * activation descriptor.
1052 static int set_distrib_bits(struct cpumask
*flush_mask
, struct bau_control
*bcp
,
1053 struct bau_desc
*bau_desc
, int *localsp
, int *remotesp
)
1058 struct hub_and_pnode
*hpp
;
1060 for_each_cpu(cpu
, flush_mask
) {
1062 * The distribution vector is a bit map of pnodes, relative
1063 * to the partition base pnode (and the partition base nasid
1065 * Translate cpu to pnode and hub using a local memory array.
1067 hpp
= &bcp
->socket_master
->thp
[cpu
];
1068 pnode
= hpp
->pnode
- bcp
->partition_base_pnode
;
1069 bau_uvhub_set(pnode
, &bau_desc
->distribution
);
1071 if (hpp
->uvhub
== bcp
->uvhub
)
1082 * globally purge translation cache of a virtual address or all TLB's
1083 * @cpumask: mask of all cpu's in which the address is to be removed
1084 * @mm: mm_struct containing virtual address range
1085 * @start: start virtual address to be removed from TLB
1086 * @end: end virtual address to be remove from TLB
1087 * @cpu: the current cpu
1089 * This is the entry point for initiating any UV global TLB shootdown.
1091 * Purges the translation caches of all specified processors of the given
1092 * virtual address, or purges all TLB's on specified processors.
1094 * The caller has derived the cpumask from the mm_struct. This function
1095 * is called only if there are bits set in the mask. (e.g. flush_tlb_page())
1097 * The cpumask is converted into a uvhubmask of the uvhubs containing
1100 * Note that this function should be called with preemption disabled.
1102 * Returns NULL if all remote flushing was done.
1103 * Returns pointer to cpumask if some remote flushing remains to be
1104 * done. The returned pointer is valid till preemption is re-enabled.
1106 const struct cpumask
*uv_flush_tlb_others(const struct cpumask
*cpumask
,
1107 const struct flush_tlb_info
*info
)
1109 unsigned int cpu
= smp_processor_id();
1110 int locals
= 0, remotes
= 0, hubs
= 0;
1111 struct bau_desc
*bau_desc
;
1112 struct cpumask
*flush_mask
;
1113 struct ptc_stats
*stat
;
1114 struct bau_control
*bcp
;
1115 unsigned long descriptor_status
, status
, address
;
1117 bcp
= &per_cpu(bau_control
, cpu
);
1127 read_lmmr(UVH_LB_BAU_SB_ACTIVATION_STATUS_0
);
1128 status
= ((descriptor_status
>> (bcp
->uvhub_cpu
*
1129 UV_ACT_STATUS_SIZE
)) & UV_ACT_STATUS_MASK
) << 1;
1130 if (status
== UV2H_DESC_BUSY
)
1135 /* bau was disabled due to slow response */
1136 if (bcp
->baudisabled
) {
1137 if (check_enable(bcp
, stat
)) {
1138 stat
->s_ipifordisabled
++;
1144 * Each sending cpu has a per-cpu mask which it fills from the caller's
1145 * cpu mask. All cpus are converted to uvhubs and copied to the
1146 * activation descriptor.
1148 flush_mask
= (struct cpumask
*)per_cpu(uv_flush_tlb_mask
, cpu
);
1149 /* don't actually do a shootdown of the local cpu */
1150 cpumask_andnot(flush_mask
, cpumask
, cpumask_of(cpu
));
1152 if (cpumask_test_cpu(cpu
, cpumask
))
1153 stat
->s_ntargself
++;
1155 bau_desc
= bcp
->descriptor_base
;
1156 bau_desc
+= (ITEMS_PER_DESC
* bcp
->uvhub_cpu
);
1157 bau_uvhubs_clear(&bau_desc
->distribution
, UV_DISTRIBUTION_SIZE
);
1158 if (set_distrib_bits(flush_mask
, bcp
, bau_desc
, &locals
, &remotes
))
1161 record_send_statistics(stat
, locals
, hubs
, remotes
, bau_desc
);
1163 if (!info
->end
|| (info
->end
- info
->start
) <= PAGE_SIZE
)
1164 address
= info
->start
;
1166 address
= TLB_FLUSH_ALL
;
1168 switch (bcp
->uvhub_version
) {
1172 bau_desc
->payload
.uv1_2_3
.address
= address
;
1173 bau_desc
->payload
.uv1_2_3
.sending_cpu
= cpu
;
1176 bau_desc
->payload
.uv4
.address
= address
;
1177 bau_desc
->payload
.uv4
.sending_cpu
= cpu
;
1178 bau_desc
->payload
.uv4
.qualifier
= BAU_DESC_QUALIFIER
;
1183 * uv_flush_send_and_wait returns 0 if all cpu's were messaged,
1184 * or 1 if it gave up and the original cpumask should be returned.
1186 if (!uv_flush_send_and_wait(flush_mask
, bcp
, bau_desc
))
1193 * Search the message queue for any 'other' unprocessed message with the
1194 * same software acknowledge resource bit vector as the 'msg' message.
1196 static struct bau_pq_entry
*find_another_by_swack(struct bau_pq_entry
*msg
,
1197 struct bau_control
*bcp
)
1199 struct bau_pq_entry
*msg_next
= msg
+ 1;
1200 unsigned char swack_vec
= msg
->swack_vec
;
1202 if (msg_next
> bcp
->queue_last
)
1203 msg_next
= bcp
->queue_first
;
1204 while (msg_next
!= msg
) {
1205 if ((msg_next
->canceled
== 0) && (msg_next
->replied_to
== 0) &&
1206 (msg_next
->swack_vec
== swack_vec
))
1209 if (msg_next
> bcp
->queue_last
)
1210 msg_next
= bcp
->queue_first
;
1216 * UV2 needs to work around a bug in which an arriving message has not
1217 * set a bit in the UVH_LB_BAU_INTD_SOFTWARE_ACKNOWLEDGE register.
1218 * Such a message must be ignored.
1220 void process_uv2_message(struct msg_desc
*mdp
, struct bau_control
*bcp
)
1222 unsigned long mmr_image
;
1223 unsigned char swack_vec
;
1224 struct bau_pq_entry
*msg
= mdp
->msg
;
1225 struct bau_pq_entry
*other_msg
;
1227 mmr_image
= ops
.read_l_sw_ack();
1228 swack_vec
= msg
->swack_vec
;
1230 if ((swack_vec
& mmr_image
) == 0) {
1232 * This message was assigned a swack resource, but no
1233 * reserved acknowlegment is pending.
1234 * The bug has prevented this message from setting the MMR.
1237 * Some message has set the MMR 'pending' bit; it might have
1238 * been another message. Look for that message.
1240 other_msg
= find_another_by_swack(msg
, bcp
);
1243 * There is another. Process this one but do not
1246 bau_process_message(mdp
, bcp
, 0);
1248 * Let the natural processing of that other message
1249 * acknowledge it. Don't get the processing of sw_ack's
1257 * Either the MMR shows this one pending a reply or there is no
1258 * other message using this sw_ack, so it is safe to acknowledge it.
1260 bau_process_message(mdp
, bcp
, 1);
1266 * The BAU message interrupt comes here. (registered by set_intr_gate)
1269 * We received a broadcast assist message.
1271 * Interrupts are disabled; this interrupt could represent
1272 * the receipt of several messages.
1274 * All cores/threads on this hub get this interrupt.
1275 * The last one to see it does the software ack.
1276 * (the resource will not be freed until noninterruptable cpus see this
1277 * interrupt; hardware may timeout the s/w ack and reply ERROR)
1279 void uv_bau_message_interrupt(struct pt_regs
*regs
)
1282 cycles_t time_start
;
1283 struct bau_pq_entry
*msg
;
1284 struct bau_control
*bcp
;
1285 struct ptc_stats
*stat
;
1286 struct msg_desc msgdesc
;
1289 time_start
= get_cycles();
1291 bcp
= &per_cpu(bau_control
, smp_processor_id());
1294 msgdesc
.queue_first
= bcp
->queue_first
;
1295 msgdesc
.queue_last
= bcp
->queue_last
;
1297 msg
= bcp
->bau_msg_head
;
1298 while (msg
->swack_vec
) {
1301 msgdesc
.msg_slot
= msg
- msgdesc
.queue_first
;
1303 if (bcp
->uvhub_version
== UV_BAU_V2
)
1304 process_uv2_message(&msgdesc
, bcp
);
1306 /* no error workaround for uv1 or uv3 */
1307 bau_process_message(&msgdesc
, bcp
, 1);
1310 if (msg
> msgdesc
.queue_last
)
1311 msg
= msgdesc
.queue_first
;
1312 bcp
->bau_msg_head
= msg
;
1314 stat
->d_time
+= (get_cycles() - time_start
);
1322 * Each target uvhub (i.e. a uvhub that has cpu's) needs to have
1323 * shootdown message timeouts enabled. The timeout does not cause
1324 * an interrupt, but causes an error message to be returned to
1327 static void __init
enable_timeouts(void)
1332 unsigned long mmr_image
;
1334 nuvhubs
= uv_num_possible_blades();
1336 for (uvhub
= 0; uvhub
< nuvhubs
; uvhub
++) {
1337 if (!uv_blade_nr_possible_cpus(uvhub
))
1340 pnode
= uv_blade_to_pnode(uvhub
);
1341 mmr_image
= read_mmr_misc_control(pnode
);
1343 * Set the timeout period and then lock it in, in three
1344 * steps; captures and locks in the period.
1346 * To program the period, the SOFT_ACK_MODE must be off.
1348 mmr_image
&= ~(1L << SOFTACK_MSHIFT
);
1349 write_mmr_misc_control(pnode
, mmr_image
);
1351 * Set the 4-bit period.
1353 mmr_image
&= ~((unsigned long)0xf << SOFTACK_PSHIFT
);
1354 mmr_image
|= (SOFTACK_TIMEOUT_PERIOD
<< SOFTACK_PSHIFT
);
1355 write_mmr_misc_control(pnode
, mmr_image
);
1358 * Subsequent reversals of the timebase bit (3) cause an
1359 * immediate timeout of one or all INTD resources as
1360 * indicated in bits 2:0 (7 causes all of them to timeout).
1362 mmr_image
|= (1L << SOFTACK_MSHIFT
);
1364 /* do not touch the legacy mode bit */
1365 /* hw bug workaround; do not use extended status */
1366 mmr_image
&= ~(1L << UV2_EXT_SHFT
);
1367 } else if (is_uv3_hub()) {
1368 mmr_image
&= ~(1L << PREFETCH_HINT_SHFT
);
1369 mmr_image
|= (1L << SB_STATUS_SHFT
);
1371 write_mmr_misc_control(pnode
, mmr_image
);
1375 static void *ptc_seq_start(struct seq_file
*file
, loff_t
*offset
)
1377 if (*offset
< num_possible_cpus())
1382 static void *ptc_seq_next(struct seq_file
*file
, void *data
, loff_t
*offset
)
1385 if (*offset
< num_possible_cpus())
1390 static void ptc_seq_stop(struct seq_file
*file
, void *data
)
1395 * Display the statistics thru /proc/sgi_uv/ptc_statistics
1396 * 'data' points to the cpu number
1397 * Note: see the descriptions in stat_description[].
1399 static int ptc_seq_show(struct seq_file
*file
, void *data
)
1401 struct ptc_stats
*stat
;
1402 struct bau_control
*bcp
;
1405 cpu
= *(loff_t
*)data
;
1408 "# cpu bauoff sent stime self locals remotes ncpus localhub ");
1409 seq_puts(file
, "remotehub numuvhubs numuvhubs16 numuvhubs8 ");
1411 "numuvhubs4 numuvhubs2 numuvhubs1 dto snacks retries ");
1413 "rok resetp resett giveup sto bz throt disable ");
1415 "enable wars warshw warwaits enters ipidis plugged ");
1417 "ipiover glim cong swack recv rtime all one mult ");
1418 seq_puts(file
, "none retry canc nocan reset rcan\n");
1420 if (cpu
< num_possible_cpus() && cpu_online(cpu
)) {
1421 bcp
= &per_cpu(bau_control
, cpu
);
1423 seq_printf(file
, "cpu %d bau disabled\n", cpu
);
1427 /* source side statistics */
1429 "cpu %d %d %ld %ld %ld %ld %ld %ld %ld %ld %ld %ld ",
1430 cpu
, bcp
->nobau
, stat
->s_requestor
,
1431 cycles_2_us(stat
->s_time
),
1432 stat
->s_ntargself
, stat
->s_ntarglocals
,
1433 stat
->s_ntargremotes
, stat
->s_ntargcpu
,
1434 stat
->s_ntarglocaluvhub
, stat
->s_ntargremoteuvhub
,
1435 stat
->s_ntarguvhub
, stat
->s_ntarguvhub16
);
1436 seq_printf(file
, "%ld %ld %ld %ld %ld %ld ",
1437 stat
->s_ntarguvhub8
, stat
->s_ntarguvhub4
,
1438 stat
->s_ntarguvhub2
, stat
->s_ntarguvhub1
,
1439 stat
->s_dtimeout
, stat
->s_strongnacks
);
1440 seq_printf(file
, "%ld %ld %ld %ld %ld %ld %ld %ld ",
1441 stat
->s_retry_messages
, stat
->s_retriesok
,
1442 stat
->s_resets_plug
, stat
->s_resets_timeout
,
1443 stat
->s_giveup
, stat
->s_stimeout
,
1444 stat
->s_busy
, stat
->s_throttles
);
1445 seq_printf(file
, "%ld %ld %ld %ld %ld %ld %ld %ld %ld %ld %ld ",
1446 stat
->s_bau_disabled
, stat
->s_bau_reenabled
,
1447 stat
->s_uv2_wars
, stat
->s_uv2_wars_hw
,
1448 stat
->s_uv2_war_waits
, stat
->s_enters
,
1449 stat
->s_ipifordisabled
, stat
->s_plugged
,
1450 stat
->s_overipilimit
, stat
->s_giveuplimit
,
1453 /* destination side statistics */
1455 "%lx %ld %ld %ld %ld %ld %ld %ld %ld %ld %ld %ld\n",
1456 ops
.read_g_sw_ack(uv_cpu_to_pnode(cpu
)),
1457 stat
->d_requestee
, cycles_2_us(stat
->d_time
),
1458 stat
->d_alltlb
, stat
->d_onetlb
, stat
->d_multmsg
,
1459 stat
->d_nomsg
, stat
->d_retries
, stat
->d_canceled
,
1460 stat
->d_nocanceled
, stat
->d_resets
,
1467 * Display the tunables thru debugfs
1469 static ssize_t
tunables_read(struct file
*file
, char __user
*userbuf
,
1470 size_t count
, loff_t
*ppos
)
1475 buf
= kasprintf(GFP_KERNEL
, "%s %s %s\n%d %d %d %d %d %d %d %d %d %d\n",
1476 "max_concur plugged_delay plugsb4reset timeoutsb4reset",
1477 "ipi_reset_limit complete_threshold congested_response_us",
1478 "congested_reps disabled_period giveup_limit",
1479 max_concurr
, plugged_delay
, plugsb4reset
,
1480 timeoutsb4reset
, ipi_reset_limit
, complete_threshold
,
1481 congested_respns_us
, congested_reps
, disabled_period
,
1487 ret
= simple_read_from_buffer(userbuf
, count
, ppos
, buf
, strlen(buf
));
1493 * handle a write to /proc/sgi_uv/ptc_statistics
1494 * -1: reset the statistics
1495 * 0: display meaning of the statistics
1497 static ssize_t
ptc_proc_write(struct file
*file
, const char __user
*user
,
1498 size_t count
, loff_t
*data
)
1505 struct ptc_stats
*stat
;
1507 if (count
== 0 || count
> sizeof(optstr
))
1509 if (copy_from_user(optstr
, user
, count
))
1511 optstr
[count
- 1] = '\0';
1513 if (!strcmp(optstr
, "on")) {
1516 } else if (!strcmp(optstr
, "off")) {
1521 if (kstrtol(optstr
, 10, &input_arg
) < 0) {
1522 pr_debug("%s is invalid\n", optstr
);
1526 if (input_arg
== 0) {
1527 elements
= ARRAY_SIZE(stat_description
);
1528 pr_debug("# cpu: cpu number\n");
1529 pr_debug("Sender statistics:\n");
1530 for (i
= 0; i
< elements
; i
++)
1531 pr_debug("%s\n", stat_description
[i
]);
1532 } else if (input_arg
== -1) {
1533 for_each_present_cpu(cpu
) {
1534 stat
= &per_cpu(ptcstats
, cpu
);
1535 memset(stat
, 0, sizeof(struct ptc_stats
));
1542 static int local_atoi(const char *name
)
1549 val
= 10*val
+(*name
-'0');
1558 * Parse the values written to /sys/kernel/debug/sgi_uv/bau_tunables.
1559 * Zero values reset them to defaults.
1561 static int parse_tunables_write(struct bau_control
*bcp
, char *instr
,
1568 int e
= ARRAY_SIZE(tunables
);
1570 p
= instr
+ strspn(instr
, WHITESPACE
);
1572 for (; *p
; p
= q
+ strspn(q
, WHITESPACE
)) {
1573 q
= p
+ strcspn(p
, WHITESPACE
);
1579 pr_info("bau tunable error: should be %d values\n", e
);
1583 p
= instr
+ strspn(instr
, WHITESPACE
);
1585 for (cnt
= 0; *p
; p
= q
+ strspn(q
, WHITESPACE
), cnt
++) {
1586 q
= p
+ strcspn(p
, WHITESPACE
);
1587 val
= local_atoi(p
);
1591 max_concurr
= MAX_BAU_CONCURRENT
;
1592 max_concurr_const
= MAX_BAU_CONCURRENT
;
1595 if (val
< 1 || val
> bcp
->cpus_in_uvhub
) {
1597 "Error: BAU max concurrent %d is invalid\n",
1602 max_concurr_const
= val
;
1606 *tunables
[cnt
].tunp
= tunables
[cnt
].deflt
;
1608 *tunables
[cnt
].tunp
= val
;
1618 * Handle a write to debugfs. (/sys/kernel/debug/sgi_uv/bau_tunables)
1620 static ssize_t
tunables_write(struct file
*file
, const char __user
*user
,
1621 size_t count
, loff_t
*data
)
1626 struct bau_control
*bcp
;
1628 if (count
== 0 || count
> sizeof(instr
)-1)
1630 if (copy_from_user(instr
, user
, count
))
1633 instr
[count
] = '\0';
1636 bcp
= &per_cpu(bau_control
, cpu
);
1637 ret
= parse_tunables_write(bcp
, instr
, count
);
1642 for_each_present_cpu(cpu
) {
1643 bcp
= &per_cpu(bau_control
, cpu
);
1644 bcp
->max_concurr
= max_concurr
;
1645 bcp
->max_concurr_const
= max_concurr
;
1646 bcp
->plugged_delay
= plugged_delay
;
1647 bcp
->plugsb4reset
= plugsb4reset
;
1648 bcp
->timeoutsb4reset
= timeoutsb4reset
;
1649 bcp
->ipi_reset_limit
= ipi_reset_limit
;
1650 bcp
->complete_threshold
= complete_threshold
;
1651 bcp
->cong_response_us
= congested_respns_us
;
1652 bcp
->cong_reps
= congested_reps
;
1653 bcp
->disabled_period
= sec_2_cycles(disabled_period
);
1654 bcp
->giveup_limit
= giveup_limit
;
1659 static const struct seq_operations uv_ptc_seq_ops
= {
1660 .start
= ptc_seq_start
,
1661 .next
= ptc_seq_next
,
1662 .stop
= ptc_seq_stop
,
1663 .show
= ptc_seq_show
1666 static int ptc_proc_open(struct inode
*inode
, struct file
*file
)
1668 return seq_open(file
, &uv_ptc_seq_ops
);
1671 static int tunables_open(struct inode
*inode
, struct file
*file
)
1676 static const struct file_operations proc_uv_ptc_operations
= {
1677 .open
= ptc_proc_open
,
1679 .write
= ptc_proc_write
,
1680 .llseek
= seq_lseek
,
1681 .release
= seq_release
,
1684 static const struct file_operations tunables_fops
= {
1685 .open
= tunables_open
,
1686 .read
= tunables_read
,
1687 .write
= tunables_write
,
1688 .llseek
= default_llseek
,
1691 static int __init
uv_ptc_init(void)
1693 struct proc_dir_entry
*proc_uv_ptc
;
1695 if (!is_uv_system())
1698 proc_uv_ptc
= proc_create(UV_PTC_BASENAME
, 0444, NULL
,
1699 &proc_uv_ptc_operations
);
1701 pr_err("unable to create %s proc entry\n",
1706 tunables_dir
= debugfs_create_dir(UV_BAU_TUNABLES_DIR
, NULL
);
1707 if (!tunables_dir
) {
1708 pr_err("unable to create debugfs directory %s\n",
1709 UV_BAU_TUNABLES_DIR
);
1712 tunables_file
= debugfs_create_file(UV_BAU_TUNABLES_FILE
, 0600,
1713 tunables_dir
, NULL
, &tunables_fops
);
1714 if (!tunables_file
) {
1715 pr_err("unable to create debugfs file %s\n",
1716 UV_BAU_TUNABLES_FILE
);
1723 * Initialize the sending side's sending buffers.
1725 static void activation_descriptor_init(int node
, int pnode
, int base_pnode
)
1734 struct bau_desc
*bau_desc
;
1735 struct bau_desc
*bd2
;
1736 struct uv1_bau_msg_header
*uv1_hdr
;
1737 struct uv2_3_bau_msg_header
*uv2_3_hdr
;
1738 struct bau_control
*bcp
;
1741 * each bau_desc is 64 bytes; there are 8 (ITEMS_PER_DESC)
1742 * per cpu; and one per cpu on the uvhub (ADP_SZ)
1744 dsize
= sizeof(struct bau_desc
) * ADP_SZ
* ITEMS_PER_DESC
;
1745 bau_desc
= kmalloc_node(dsize
, GFP_KERNEL
, node
);
1748 gpa
= uv_gpa(bau_desc
);
1749 n
= uv_gpa_to_gnode(gpa
);
1750 m
= ops
.bau_gpa_to_offset(gpa
);
1754 /* the 14-bit pnode */
1755 write_mmr_descriptor_base(pnode
, (n
<< UV_DESC_PSHIFT
| m
));
1757 * Initializing all 8 (ITEMS_PER_DESC) descriptors for each
1758 * cpu even though we only use the first one; one descriptor can
1759 * describe a broadcast to 256 uv hubs.
1761 for (i
= 0, bd2
= bau_desc
; i
< (ADP_SZ
* ITEMS_PER_DESC
); i
++, bd2
++) {
1762 memset(bd2
, 0, sizeof(struct bau_desc
));
1764 uv1_hdr
= &bd2
->header
.uv1_hdr
;
1765 uv1_hdr
->swack_flag
= 1;
1767 * The base_dest_nasid set in the message header
1768 * is the nasid of the first uvhub in the partition.
1769 * The bit map will indicate destination pnode numbers
1770 * relative to that base. They may not be consecutive
1771 * if nasid striding is being used.
1773 uv1_hdr
->base_dest_nasid
=
1774 UV_PNODE_TO_NASID(base_pnode
);
1775 uv1_hdr
->dest_subnodeid
= UV_LB_SUBNODEID
;
1776 uv1_hdr
->command
= UV_NET_ENDPOINT_INTD
;
1777 uv1_hdr
->int_both
= 1;
1779 * all others need to be set to zero:
1780 * fairness chaining multilevel count replied_to
1784 * BIOS uses legacy mode, but uv2 and uv3 hardware always
1785 * uses native mode for selective broadcasts.
1787 uv2_3_hdr
= &bd2
->header
.uv2_3_hdr
;
1788 uv2_3_hdr
->swack_flag
= 1;
1789 uv2_3_hdr
->base_dest_nasid
=
1790 UV_PNODE_TO_NASID(base_pnode
);
1791 uv2_3_hdr
->dest_subnodeid
= UV_LB_SUBNODEID
;
1792 uv2_3_hdr
->command
= UV_NET_ENDPOINT_INTD
;
1795 for_each_present_cpu(cpu
) {
1796 if (pnode
!= uv_blade_to_pnode(uv_cpu_to_blade_id(cpu
)))
1798 bcp
= &per_cpu(bau_control
, cpu
);
1799 bcp
->descriptor_base
= bau_desc
;
1804 * initialize the destination side's receiving buffers
1805 * entered for each uvhub in the partition
1806 * - node is first node (kernel memory notion) on the uvhub
1807 * - pnode is the uvhub's physical identifier
1809 static void pq_init(int node
, int pnode
)
1815 unsigned long gnode
, first
, last
, tail
;
1816 struct bau_pq_entry
*pqp
;
1817 struct bau_control
*bcp
;
1819 plsize
= (DEST_Q_SIZE
+ 1) * sizeof(struct bau_pq_entry
);
1820 vp
= kmalloc_node(plsize
, GFP_KERNEL
, node
);
1821 pqp
= (struct bau_pq_entry
*)vp
;
1824 cp
= (char *)pqp
+ 31;
1825 pqp
= (struct bau_pq_entry
*)(((unsigned long)cp
>> 5) << 5);
1827 for_each_present_cpu(cpu
) {
1828 if (pnode
!= uv_cpu_to_pnode(cpu
))
1830 /* for every cpu on this pnode: */
1831 bcp
= &per_cpu(bau_control
, cpu
);
1832 bcp
->queue_first
= pqp
;
1833 bcp
->bau_msg_head
= pqp
;
1834 bcp
->queue_last
= pqp
+ (DEST_Q_SIZE
- 1);
1837 first
= ops
.bau_gpa_to_offset(uv_gpa(pqp
));
1838 last
= ops
.bau_gpa_to_offset(uv_gpa(pqp
+ (DEST_Q_SIZE
- 1)));
1841 * Pre UV4, the gnode is required to locate the payload queue
1842 * and the payload queue tail must be maintained by the kernel.
1844 bcp
= &per_cpu(bau_control
, smp_processor_id());
1845 if (bcp
->uvhub_version
<= UV_BAU_V3
) {
1847 gnode
= uv_gpa_to_gnode(uv_gpa(pqp
));
1848 first
= (gnode
<< UV_PAYLOADQ_GNODE_SHIFT
) | tail
;
1849 write_mmr_payload_tail(pnode
, tail
);
1852 ops
.write_payload_first(pnode
, first
);
1853 ops
.write_payload_last(pnode
, last
);
1855 /* in effect, all msg_type's are set to MSG_NOOP */
1856 memset(pqp
, 0, sizeof(struct bau_pq_entry
) * DEST_Q_SIZE
);
1860 * Initialization of each UV hub's structures
1862 static void __init
init_uvhub(int uvhub
, int vector
, int base_pnode
)
1866 unsigned long apicid
;
1868 node
= uvhub_to_first_node(uvhub
);
1869 pnode
= uv_blade_to_pnode(uvhub
);
1871 activation_descriptor_init(node
, pnode
, base_pnode
);
1873 pq_init(node
, pnode
);
1875 * The below initialization can't be in firmware because the
1876 * messaging IRQ will be determined by the OS.
1878 apicid
= uvhub_to_first_apicid(uvhub
) | uv_apicid_hibits
;
1879 write_mmr_data_config(pnode
, ((apicid
<< 32) | vector
));
1883 * We will set BAU_MISC_CONTROL with a timeout period.
1884 * But the BIOS has set UVH_AGING_PRESCALE_SEL and UVH_TRANSACTION_TIMEOUT.
1885 * So the destination timeout period has to be calculated from them.
1887 static int calculate_destination_timeout(void)
1889 unsigned long mmr_image
;
1895 unsigned long ts_ns
;
1898 mult1
= SOFTACK_TIMEOUT_PERIOD
& BAU_MISC_CONTROL_MULT_MASK
;
1899 mmr_image
= uv_read_local_mmr(UVH_AGING_PRESCALE_SEL
);
1900 index
= (mmr_image
>> BAU_URGENCY_7_SHIFT
) & BAU_URGENCY_7_MASK
;
1901 mmr_image
= uv_read_local_mmr(UVH_TRANSACTION_TIMEOUT
);
1902 mult2
= (mmr_image
>> BAU_TRANS_SHIFT
) & BAU_TRANS_MASK
;
1903 ts_ns
= timeout_base_ns
[index
];
1904 ts_ns
*= (mult1
* mult2
);
1907 /* same destination timeout for uv2 and uv3 */
1908 /* 4 bits 0/1 for 10/80us base, 3 bits of multiplier */
1909 mmr_image
= uv_read_local_mmr(UVH_LB_BAU_MISC_CONTROL
);
1910 mmr_image
= (mmr_image
& UV_SA_MASK
) >> UV_SA_SHFT
;
1911 if (mmr_image
& (1L << UV2_ACK_UNITS_SHFT
))
1915 mult1
= mmr_image
& UV2_ACK_MASK
;
1921 static void __init
init_per_cpu_tunables(void)
1924 struct bau_control
*bcp
;
1926 for_each_present_cpu(cpu
) {
1927 bcp
= &per_cpu(bau_control
, cpu
);
1928 bcp
->baudisabled
= 0;
1931 bcp
->statp
= &per_cpu(ptcstats
, cpu
);
1932 /* time interval to catch a hardware stay-busy bug */
1933 bcp
->timeout_interval
= usec_2_cycles(2*timeout_us
);
1934 bcp
->max_concurr
= max_concurr
;
1935 bcp
->max_concurr_const
= max_concurr
;
1936 bcp
->plugged_delay
= plugged_delay
;
1937 bcp
->plugsb4reset
= plugsb4reset
;
1938 bcp
->timeoutsb4reset
= timeoutsb4reset
;
1939 bcp
->ipi_reset_limit
= ipi_reset_limit
;
1940 bcp
->complete_threshold
= complete_threshold
;
1941 bcp
->cong_response_us
= congested_respns_us
;
1942 bcp
->cong_reps
= congested_reps
;
1943 bcp
->disabled_period
= sec_2_cycles(disabled_period
);
1944 bcp
->giveup_limit
= giveup_limit
;
1945 spin_lock_init(&bcp
->queue_lock
);
1946 spin_lock_init(&bcp
->uvhub_lock
);
1947 spin_lock_init(&bcp
->disable_lock
);
1952 * Scan all cpus to collect blade and socket summaries.
1954 static int __init
get_cpu_topology(int base_pnode
,
1955 struct uvhub_desc
*uvhub_descs
,
1956 unsigned char *uvhub_mask
)
1962 struct bau_control
*bcp
;
1963 struct uvhub_desc
*bdp
;
1964 struct socket_desc
*sdp
;
1966 for_each_present_cpu(cpu
) {
1967 bcp
= &per_cpu(bau_control
, cpu
);
1969 memset(bcp
, 0, sizeof(struct bau_control
));
1971 pnode
= uv_cpu_hub_info(cpu
)->pnode
;
1972 if ((pnode
- base_pnode
) >= UV_DISTRIBUTION_SIZE
) {
1974 "cpu %d pnode %d-%d beyond %d; BAU disabled\n",
1975 cpu
, pnode
, base_pnode
, UV_DISTRIBUTION_SIZE
);
1979 bcp
->osnode
= cpu_to_node(cpu
);
1980 bcp
->partition_base_pnode
= base_pnode
;
1982 uvhub
= uv_cpu_hub_info(cpu
)->numa_blade_id
;
1983 *(uvhub_mask
+ (uvhub
/8)) |= (1 << (uvhub
%8));
1984 bdp
= &uvhub_descs
[uvhub
];
1990 /* kludge: 'assuming' one node per socket, and assuming that
1991 disabling a socket just leaves a gap in node numbers */
1992 socket
= bcp
->osnode
& 1;
1993 bdp
->socket_mask
|= (1 << socket
);
1994 sdp
= &bdp
->socket
[socket
];
1995 sdp
->cpu_number
[sdp
->num_cpus
] = cpu
;
1997 if (sdp
->num_cpus
> MAX_CPUS_PER_SOCKET
) {
1998 pr_emerg("%d cpus per socket invalid\n",
2007 * Each socket is to get a local array of pnodes/hubs.
2009 static void make_per_cpu_thp(struct bau_control
*smaster
)
2012 size_t hpsz
= sizeof(struct hub_and_pnode
) * num_possible_cpus();
2014 smaster
->thp
= kmalloc_node(hpsz
, GFP_KERNEL
, smaster
->osnode
);
2015 memset(smaster
->thp
, 0, hpsz
);
2016 for_each_present_cpu(cpu
) {
2017 smaster
->thp
[cpu
].pnode
= uv_cpu_hub_info(cpu
)->pnode
;
2018 smaster
->thp
[cpu
].uvhub
= uv_cpu_hub_info(cpu
)->numa_blade_id
;
2023 * Each uvhub is to get a local cpumask.
2025 static void make_per_hub_cpumask(struct bau_control
*hmaster
)
2027 int sz
= sizeof(cpumask_t
);
2029 hmaster
->cpumask
= kzalloc_node(sz
, GFP_KERNEL
, hmaster
->osnode
);
2033 * Initialize all the per_cpu information for the cpu's on a given socket,
2034 * given what has been gathered into the socket_desc struct.
2035 * And reports the chosen hub and socket masters back to the caller.
2037 static int scan_sock(struct socket_desc
*sdp
, struct uvhub_desc
*bdp
,
2038 struct bau_control
**smasterp
,
2039 struct bau_control
**hmasterp
)
2041 int i
, cpu
, uvhub_cpu
;
2042 struct bau_control
*bcp
;
2044 for (i
= 0; i
< sdp
->num_cpus
; i
++) {
2045 cpu
= sdp
->cpu_number
[i
];
2046 bcp
= &per_cpu(bau_control
, cpu
);
2053 bcp
->cpus_in_uvhub
= bdp
->num_cpus
;
2054 bcp
->cpus_in_socket
= sdp
->num_cpus
;
2055 bcp
->socket_master
= *smasterp
;
2056 bcp
->uvhub
= bdp
->uvhub
;
2058 bcp
->uvhub_version
= UV_BAU_V1
;
2059 else if (is_uv2_hub())
2060 bcp
->uvhub_version
= UV_BAU_V2
;
2061 else if (is_uv3_hub())
2062 bcp
->uvhub_version
= UV_BAU_V3
;
2063 else if (is_uv4_hub())
2064 bcp
->uvhub_version
= UV_BAU_V4
;
2066 pr_emerg("uvhub version not 1, 2, 3, or 4\n");
2069 bcp
->uvhub_master
= *hmasterp
;
2070 uvhub_cpu
= uv_cpu_blade_processor_id(cpu
);
2071 bcp
->uvhub_cpu
= uvhub_cpu
;
2074 * The ERROR and BUSY status registers are located pairwise over
2075 * the STATUS_0 and STATUS_1 mmrs; each an array[32] of 2 bits.
2077 if (uvhub_cpu
< UV_CPUS_PER_AS
) {
2078 bcp
->status_mmr
= UVH_LB_BAU_SB_ACTIVATION_STATUS_0
;
2079 bcp
->status_index
= uvhub_cpu
* UV_ACT_STATUS_SIZE
;
2081 bcp
->status_mmr
= UVH_LB_BAU_SB_ACTIVATION_STATUS_1
;
2082 bcp
->status_index
= (uvhub_cpu
- UV_CPUS_PER_AS
)
2083 * UV_ACT_STATUS_SIZE
;
2086 if (bcp
->uvhub_cpu
>= MAX_CPUS_PER_UVHUB
) {
2087 pr_emerg("%d cpus per uvhub invalid\n",
2096 * Summarize the blade and socket topology into the per_cpu structures.
2098 static int __init
summarize_uvhub_sockets(int nuvhubs
,
2099 struct uvhub_desc
*uvhub_descs
,
2100 unsigned char *uvhub_mask
)
2104 unsigned short socket_mask
;
2106 for (uvhub
= 0; uvhub
< nuvhubs
; uvhub
++) {
2107 struct uvhub_desc
*bdp
;
2108 struct bau_control
*smaster
= NULL
;
2109 struct bau_control
*hmaster
= NULL
;
2111 if (!(*(uvhub_mask
+ (uvhub
/8)) & (1 << (uvhub
%8))))
2114 bdp
= &uvhub_descs
[uvhub
];
2115 socket_mask
= bdp
->socket_mask
;
2117 while (socket_mask
) {
2118 struct socket_desc
*sdp
;
2119 if ((socket_mask
& 1)) {
2120 sdp
= &bdp
->socket
[socket
];
2121 if (scan_sock(sdp
, bdp
, &smaster
, &hmaster
))
2123 make_per_cpu_thp(smaster
);
2126 socket_mask
= (socket_mask
>> 1);
2128 make_per_hub_cpumask(hmaster
);
2134 * initialize the bau_control structure for each cpu
2136 static int __init
init_per_cpu(int nuvhubs
, int base_part_pnode
)
2138 unsigned char *uvhub_mask
;
2140 struct uvhub_desc
*uvhub_descs
;
2142 if (is_uv3_hub() || is_uv2_hub() || is_uv1_hub())
2143 timeout_us
= calculate_destination_timeout();
2145 vp
= kmalloc(nuvhubs
* sizeof(struct uvhub_desc
), GFP_KERNEL
);
2146 uvhub_descs
= (struct uvhub_desc
*)vp
;
2147 memset(uvhub_descs
, 0, nuvhubs
* sizeof(struct uvhub_desc
));
2148 uvhub_mask
= kzalloc((nuvhubs
+7)/8, GFP_KERNEL
);
2150 if (get_cpu_topology(base_part_pnode
, uvhub_descs
, uvhub_mask
))
2153 if (summarize_uvhub_sockets(nuvhubs
, uvhub_descs
, uvhub_mask
))
2158 init_per_cpu_tunables();
2167 static const struct bau_operations uv1_bau_ops __initconst
= {
2168 .bau_gpa_to_offset
= uv_gpa_to_offset
,
2169 .read_l_sw_ack
= read_mmr_sw_ack
,
2170 .read_g_sw_ack
= read_gmmr_sw_ack
,
2171 .write_l_sw_ack
= write_mmr_sw_ack
,
2172 .write_g_sw_ack
= write_gmmr_sw_ack
,
2173 .write_payload_first
= write_mmr_payload_first
,
2174 .write_payload_last
= write_mmr_payload_last
,
2175 .wait_completion
= uv1_wait_completion
,
2178 static const struct bau_operations uv2_3_bau_ops __initconst
= {
2179 .bau_gpa_to_offset
= uv_gpa_to_offset
,
2180 .read_l_sw_ack
= read_mmr_sw_ack
,
2181 .read_g_sw_ack
= read_gmmr_sw_ack
,
2182 .write_l_sw_ack
= write_mmr_sw_ack
,
2183 .write_g_sw_ack
= write_gmmr_sw_ack
,
2184 .write_payload_first
= write_mmr_payload_first
,
2185 .write_payload_last
= write_mmr_payload_last
,
2186 .wait_completion
= uv2_3_wait_completion
,
2189 static const struct bau_operations uv4_bau_ops __initconst
= {
2190 .bau_gpa_to_offset
= uv_gpa_to_soc_phys_ram
,
2191 .read_l_sw_ack
= read_mmr_proc_sw_ack
,
2192 .read_g_sw_ack
= read_gmmr_proc_sw_ack
,
2193 .write_l_sw_ack
= write_mmr_proc_sw_ack
,
2194 .write_g_sw_ack
= write_gmmr_proc_sw_ack
,
2195 .write_payload_first
= write_mmr_proc_payload_first
,
2196 .write_payload_last
= write_mmr_proc_payload_last
,
2197 .wait_completion
= uv4_wait_completion
,
2201 * Initialization of BAU-related structures
2203 static int __init
uv_bau_init(void)
2211 cpumask_var_t
*mask
;
2213 if (!is_uv_system())
2218 else if (is_uv3_hub())
2219 ops
= uv2_3_bau_ops
;
2220 else if (is_uv2_hub())
2221 ops
= uv2_3_bau_ops
;
2222 else if (is_uv1_hub())
2225 for_each_possible_cpu(cur_cpu
) {
2226 mask
= &per_cpu(uv_flush_tlb_mask
, cur_cpu
);
2227 zalloc_cpumask_var_node(mask
, GFP_KERNEL
, cpu_to_node(cur_cpu
));
2230 nuvhubs
= uv_num_possible_blades();
2231 congested_cycles
= usec_2_cycles(congested_respns_us
);
2233 uv_base_pnode
= 0x7fffffff;
2234 for (uvhub
= 0; uvhub
< nuvhubs
; uvhub
++) {
2235 cpus
= uv_blade_nr_possible_cpus(uvhub
);
2236 if (cpus
&& (uv_blade_to_pnode(uvhub
) < uv_base_pnode
))
2237 uv_base_pnode
= uv_blade_to_pnode(uvhub
);
2240 /* software timeouts are not supported on UV4 */
2241 if (is_uv3_hub() || is_uv2_hub() || is_uv1_hub())
2244 if (init_per_cpu(nuvhubs
, uv_base_pnode
)) {
2250 vector
= UV_BAU_MESSAGE
;
2251 for_each_possible_blade(uvhub
) {
2252 if (uv_blade_nr_possible_cpus(uvhub
))
2253 init_uvhub(uvhub
, vector
, uv_base_pnode
);
2256 alloc_intr_gate(vector
, uv_bau_message_intr1
);
2258 for_each_possible_blade(uvhub
) {
2259 if (uv_blade_nr_possible_cpus(uvhub
)) {
2262 pnode
= uv_blade_to_pnode(uvhub
);
2265 write_gmmr_activation(pnode
, val
);
2266 mmr
= 1; /* should be 1 to broadcast to both sockets */
2268 write_mmr_data_broadcast(pnode
, mmr
);
2274 core_initcall(uv_bau_init
);
2275 fs_initcall(uv_ptc_init
);