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23#include <linux/kernel.h>
24#include <linux/errno.h>
25#include <linux/slab.h>
26#include <linux/mm.h>
27#include <linux/spinlock.h>
28#include <linux/device.h>
29#include <linux/miscdevice.h>
30#include <linux/proc_fs.h>
31#include <linux/interrupt.h>
32#include <linux/uaccess.h>
33#include <linux/delay.h>
34#include <linux/export.h>
35#include <asm/io_apic.h>
36#include "gru.h"
37#include "grulib.h"
38#include "grutables.h"
39#include "grukservices.h"
40#include "gru_instructions.h"
41#include <asm/uv/uv_hub.h>
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98
99#define ASYNC_HAN_TO_BID(h) ((h) - 1)
100#define ASYNC_BID_TO_HAN(b) ((b) + 1)
101#define ASYNC_HAN_TO_BS(h) gru_base[ASYNC_HAN_TO_BID(h)]
102
103#define GRU_NUM_KERNEL_CBR 1
104#define GRU_NUM_KERNEL_DSR_BYTES 256
105#define GRU_NUM_KERNEL_DSR_CL (GRU_NUM_KERNEL_DSR_BYTES / \
106 GRU_CACHE_LINE_BYTES)
107
108
109#define IMA IMA_CB_DELAY
110
111
112#define __gru_cacheline_aligned__ \
113 __attribute__((__aligned__(GRU_CACHE_LINE_BYTES)))
114
115#define MAGIC 0x1234567887654321UL
116
117
118#define EXCEPTION_RETRY_LIMIT 3
119
120
121#define MQS_EMPTY 0
122#define MQS_FULL 1
123#define MQS_NOOP 2
124
125
126
127struct message_queue {
128 union gru_mesqhead head __gru_cacheline_aligned__;
129 int qlines;
130 long hstatus[2];
131 void *next __gru_cacheline_aligned__;
132 void *limit;
133 void *start;
134 void *start2;
135 char data ____cacheline_aligned;
136};
137
138
139struct message_header {
140 char present;
141 char present2;
142 char lines;
143 char fill;
144};
145
146#define HSTATUS(mq, h) ((mq) + offsetof(struct message_queue, hstatus[h]))
147
148
149
150
151
152static void gru_load_kernel_context(struct gru_blade_state *bs, int blade_id)
153{
154 struct gru_state *gru;
155 struct gru_thread_state *kgts;
156 void *vaddr;
157 int ctxnum, ncpus;
158
159 up_read(&bs->bs_kgts_sema);
160 down_write(&bs->bs_kgts_sema);
161
162 if (!bs->bs_kgts) {
163 bs->bs_kgts = gru_alloc_gts(NULL, 0, 0, 0, 0, 0);
164 bs->bs_kgts->ts_user_blade_id = blade_id;
165 }
166 kgts = bs->bs_kgts;
167
168 if (!kgts->ts_gru) {
169 STAT(load_kernel_context);
170 ncpus = uv_blade_nr_possible_cpus(blade_id);
171 kgts->ts_cbr_au_count = GRU_CB_COUNT_TO_AU(
172 GRU_NUM_KERNEL_CBR * ncpus + bs->bs_async_cbrs);
173 kgts->ts_dsr_au_count = GRU_DS_BYTES_TO_AU(
174 GRU_NUM_KERNEL_DSR_BYTES * ncpus +
175 bs->bs_async_dsr_bytes);
176 while (!gru_assign_gru_context(kgts)) {
177 msleep(1);
178 gru_steal_context(kgts);
179 }
180 gru_load_context(kgts);
181 gru = bs->bs_kgts->ts_gru;
182 vaddr = gru->gs_gru_base_vaddr;
183 ctxnum = kgts->ts_ctxnum;
184 bs->kernel_cb = get_gseg_base_address_cb(vaddr, ctxnum, 0);
185 bs->kernel_dsr = get_gseg_base_address_ds(vaddr, ctxnum, 0);
186 }
187 downgrade_write(&bs->bs_kgts_sema);
188}
189
190
191
192
193
194static int gru_free_kernel_contexts(void)
195{
196 struct gru_blade_state *bs;
197 struct gru_thread_state *kgts;
198 int bid, ret = 0;
199
200 for (bid = 0; bid < GRU_MAX_BLADES; bid++) {
201 bs = gru_base[bid];
202 if (!bs)
203 continue;
204
205
206 if (down_write_trylock(&bs->bs_kgts_sema)) {
207 kgts = bs->bs_kgts;
208 if (kgts && kgts->ts_gru)
209 gru_unload_context(kgts, 0);
210 bs->bs_kgts = NULL;
211 up_write(&bs->bs_kgts_sema);
212 kfree(kgts);
213 } else {
214 ret++;
215 }
216 }
217 return ret;
218}
219
220
221
222
223static struct gru_blade_state *gru_lock_kernel_context(int blade_id)
224{
225 struct gru_blade_state *bs;
226 int bid;
227
228 STAT(lock_kernel_context);
229again:
230 bid = blade_id < 0 ? uv_numa_blade_id() : blade_id;
231 bs = gru_base[bid];
232
233
234 down_read(&bs->bs_kgts_sema);
235 if (blade_id < 0 && bid != uv_numa_blade_id()) {
236 up_read(&bs->bs_kgts_sema);
237 goto again;
238 }
239 if (!bs->bs_kgts || !bs->bs_kgts->ts_gru)
240 gru_load_kernel_context(bs, bid);
241 return bs;
242
243}
244
245
246
247
248
249static void gru_unlock_kernel_context(int blade_id)
250{
251 struct gru_blade_state *bs;
252
253 bs = gru_base[blade_id];
254 up_read(&bs->bs_kgts_sema);
255 STAT(unlock_kernel_context);
256}
257
258
259
260
261
262static int gru_get_cpu_resources(int dsr_bytes, void **cb, void **dsr)
263{
264 struct gru_blade_state *bs;
265 int lcpu;
266
267 BUG_ON(dsr_bytes > GRU_NUM_KERNEL_DSR_BYTES);
268 preempt_disable();
269 bs = gru_lock_kernel_context(-1);
270 lcpu = uv_blade_processor_id();
271 *cb = bs->kernel_cb + lcpu * GRU_HANDLE_STRIDE;
272 *dsr = bs->kernel_dsr + lcpu * GRU_NUM_KERNEL_DSR_BYTES;
273 return 0;
274}
275
276
277
278
279static void gru_free_cpu_resources(void *cb, void *dsr)
280{
281 gru_unlock_kernel_context(uv_numa_blade_id());
282 preempt_enable();
283}
284
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295
296
297unsigned long gru_reserve_async_resources(int blade_id, int cbrs, int dsr_bytes,
298 struct completion *cmp)
299{
300 struct gru_blade_state *bs;
301 struct gru_thread_state *kgts;
302 int ret = 0;
303
304 bs = gru_base[blade_id];
305
306 down_write(&bs->bs_kgts_sema);
307
308
309 if (bs->bs_async_dsr_bytes + bs->bs_async_cbrs)
310 goto done;
311 bs->bs_async_dsr_bytes = dsr_bytes;
312 bs->bs_async_cbrs = cbrs;
313 bs->bs_async_wq = cmp;
314 kgts = bs->bs_kgts;
315
316
317 if (kgts && kgts->ts_gru)
318 gru_unload_context(kgts, 0);
319 ret = ASYNC_BID_TO_HAN(blade_id);
320
321done:
322 up_write(&bs->bs_kgts_sema);
323 return ret;
324}
325
326
327
328
329
330
331
332void gru_release_async_resources(unsigned long han)
333{
334 struct gru_blade_state *bs = ASYNC_HAN_TO_BS(han);
335
336 down_write(&bs->bs_kgts_sema);
337 bs->bs_async_dsr_bytes = 0;
338 bs->bs_async_cbrs = 0;
339 bs->bs_async_wq = NULL;
340 up_write(&bs->bs_kgts_sema);
341}
342
343
344
345
346
347
348
349void gru_wait_async_cbr(unsigned long han)
350{
351 struct gru_blade_state *bs = ASYNC_HAN_TO_BS(han);
352
353 wait_for_completion(bs->bs_async_wq);
354 mb();
355}
356
357
358
359
360
361
362
363
364
365
366void gru_lock_async_resource(unsigned long han, void **cb, void **dsr)
367{
368 struct gru_blade_state *bs = ASYNC_HAN_TO_BS(han);
369 int blade_id = ASYNC_HAN_TO_BID(han);
370 int ncpus;
371
372 gru_lock_kernel_context(blade_id);
373 ncpus = uv_blade_nr_possible_cpus(blade_id);
374 if (cb)
375 *cb = bs->kernel_cb + ncpus * GRU_HANDLE_STRIDE;
376 if (dsr)
377 *dsr = bs->kernel_dsr + ncpus * GRU_NUM_KERNEL_DSR_BYTES;
378}
379
380
381
382
383
384
385
386void gru_unlock_async_resource(unsigned long han)
387{
388 int blade_id = ASYNC_HAN_TO_BID(han);
389
390 gru_unlock_kernel_context(blade_id);
391}
392
393
394int gru_get_cb_exception_detail(void *cb,
395 struct control_block_extended_exc_detail *excdet)
396{
397 struct gru_control_block_extended *cbe;
398 struct gru_thread_state *kgts = NULL;
399 unsigned long off;
400 int cbrnum, bid;
401
402
403
404
405
406
407 for_each_possible_blade(bid) {
408 if (!gru_base[bid])
409 break;
410 kgts = gru_base[bid]->bs_kgts;
411 if (!kgts || !kgts->ts_gru)
412 continue;
413 off = cb - kgts->ts_gru->gs_gru_base_vaddr;
414 if (off < GRU_SIZE)
415 break;
416 kgts = NULL;
417 }
418 BUG_ON(!kgts);
419 cbrnum = thread_cbr_number(kgts, get_cb_number(cb));
420 cbe = get_cbe(GRUBASE(cb), cbrnum);
421 gru_flush_cache(cbe);
422 sync_core();
423 excdet->opc = cbe->opccpy;
424 excdet->exopc = cbe->exopccpy;
425 excdet->ecause = cbe->ecause;
426 excdet->exceptdet0 = cbe->idef1upd;
427 excdet->exceptdet1 = cbe->idef3upd;
428 gru_flush_cache(cbe);
429 return 0;
430}
431
432char *gru_get_cb_exception_detail_str(int ret, void *cb,
433 char *buf, int size)
434{
435 struct gru_control_block_status *gen = (void *)cb;
436 struct control_block_extended_exc_detail excdet;
437
438 if (ret > 0 && gen->istatus == CBS_EXCEPTION) {
439 gru_get_cb_exception_detail(cb, &excdet);
440 snprintf(buf, size,
441 "GRU:%d exception: cb %p, opc %d, exopc %d, ecause 0x%x,"
442 "excdet0 0x%lx, excdet1 0x%x", smp_processor_id(),
443 gen, excdet.opc, excdet.exopc, excdet.ecause,
444 excdet.exceptdet0, excdet.exceptdet1);
445 } else {
446 snprintf(buf, size, "No exception");
447 }
448 return buf;
449}
450
451static int gru_wait_idle_or_exception(struct gru_control_block_status *gen)
452{
453 while (gen->istatus >= CBS_ACTIVE) {
454 cpu_relax();
455 barrier();
456 }
457 return gen->istatus;
458}
459
460static int gru_retry_exception(void *cb)
461{
462 struct gru_control_block_status *gen = (void *)cb;
463 struct control_block_extended_exc_detail excdet;
464 int retry = EXCEPTION_RETRY_LIMIT;
465
466 while (1) {
467 if (gru_wait_idle_or_exception(gen) == CBS_IDLE)
468 return CBS_IDLE;
469 if (gru_get_cb_message_queue_substatus(cb))
470 return CBS_EXCEPTION;
471 gru_get_cb_exception_detail(cb, &excdet);
472 if ((excdet.ecause & ~EXCEPTION_RETRY_BITS) ||
473 (excdet.cbrexecstatus & CBR_EXS_ABORT_OCC))
474 break;
475 if (retry-- == 0)
476 break;
477 gen->icmd = 1;
478 gru_flush_cache(gen);
479 }
480 return CBS_EXCEPTION;
481}
482
483int gru_check_status_proc(void *cb)
484{
485 struct gru_control_block_status *gen = (void *)cb;
486 int ret;
487
488 ret = gen->istatus;
489 if (ret == CBS_EXCEPTION)
490 ret = gru_retry_exception(cb);
491 rmb();
492 return ret;
493
494}
495
496int gru_wait_proc(void *cb)
497{
498 struct gru_control_block_status *gen = (void *)cb;
499 int ret;
500
501 ret = gru_wait_idle_or_exception(gen);
502 if (ret == CBS_EXCEPTION)
503 ret = gru_retry_exception(cb);
504 rmb();
505 return ret;
506}
507
508void gru_abort(int ret, void *cb, char *str)
509{
510 char buf[GRU_EXC_STR_SIZE];
511
512 panic("GRU FATAL ERROR: %s - %s\n", str,
513 gru_get_cb_exception_detail_str(ret, cb, buf, sizeof(buf)));
514}
515
516void gru_wait_abort_proc(void *cb)
517{
518 int ret;
519
520 ret = gru_wait_proc(cb);
521 if (ret)
522 gru_abort(ret, cb, "gru_wait_abort");
523}
524
525
526
527
528
529#define MQIE_AGAIN -1
530
531
532
533
534
535
536static inline int get_present2(void *p)
537{
538 struct message_header *mhdr = p + GRU_CACHE_LINE_BYTES;
539 return mhdr->present;
540}
541
542static inline void restore_present2(void *p, int val)
543{
544 struct message_header *mhdr = p + GRU_CACHE_LINE_BYTES;
545 mhdr->present = val;
546}
547
548
549
550
551
552int gru_create_message_queue(struct gru_message_queue_desc *mqd,
553 void *p, unsigned int bytes, int nasid, int vector, int apicid)
554{
555 struct message_queue *mq = p;
556 unsigned int qlines;
557
558 qlines = bytes / GRU_CACHE_LINE_BYTES - 2;
559 memset(mq, 0, bytes);
560 mq->start = &mq->data;
561 mq->start2 = &mq->data + (qlines / 2 - 1) * GRU_CACHE_LINE_BYTES;
562 mq->next = &mq->data;
563 mq->limit = &mq->data + (qlines - 2) * GRU_CACHE_LINE_BYTES;
564 mq->qlines = qlines;
565 mq->hstatus[0] = 0;
566 mq->hstatus[1] = 1;
567 mq->head = gru_mesq_head(2, qlines / 2 + 1);
568 mqd->mq = mq;
569 mqd->mq_gpa = uv_gpa(mq);
570 mqd->qlines = qlines;
571 mqd->interrupt_pnode = nasid >> 1;
572 mqd->interrupt_vector = vector;
573 mqd->interrupt_apicid = apicid;
574 return 0;
575}
576EXPORT_SYMBOL_GPL(gru_create_message_queue);
577
578
579
580
581
582
583
584
585
586static int send_noop_message(void *cb, struct gru_message_queue_desc *mqd,
587 void *mesg)
588{
589 const struct message_header noop_header = {
590 .present = MQS_NOOP, .lines = 1};
591 unsigned long m;
592 int substatus, ret;
593 struct message_header save_mhdr, *mhdr = mesg;
594
595 STAT(mesq_noop);
596 save_mhdr = *mhdr;
597 *mhdr = noop_header;
598 gru_mesq(cb, mqd->mq_gpa, gru_get_tri(mhdr), 1, IMA);
599 ret = gru_wait(cb);
600
601 if (ret) {
602 substatus = gru_get_cb_message_queue_substatus(cb);
603 switch (substatus) {
604 case CBSS_NO_ERROR:
605 STAT(mesq_noop_unexpected_error);
606 ret = MQE_UNEXPECTED_CB_ERR;
607 break;
608 case CBSS_LB_OVERFLOWED:
609 STAT(mesq_noop_lb_overflow);
610 ret = MQE_CONGESTION;
611 break;
612 case CBSS_QLIMIT_REACHED:
613 STAT(mesq_noop_qlimit_reached);
614 ret = 0;
615 break;
616 case CBSS_AMO_NACKED:
617 STAT(mesq_noop_amo_nacked);
618 ret = MQE_CONGESTION;
619 break;
620 case CBSS_PUT_NACKED:
621 STAT(mesq_noop_put_nacked);
622 m = mqd->mq_gpa + (gru_get_amo_value_head(cb) << 6);
623 gru_vstore(cb, m, gru_get_tri(mesg), XTYPE_CL, 1, 1,
624 IMA);
625 if (gru_wait(cb) == CBS_IDLE)
626 ret = MQIE_AGAIN;
627 else
628 ret = MQE_UNEXPECTED_CB_ERR;
629 break;
630 case CBSS_PAGE_OVERFLOW:
631 STAT(mesq_noop_page_overflow);
632
633 default:
634 BUG();
635 }
636 }
637 *mhdr = save_mhdr;
638 return ret;
639}
640
641
642
643
644static int send_message_queue_full(void *cb, struct gru_message_queue_desc *mqd,
645 void *mesg, int lines)
646{
647 union gru_mesqhead mqh;
648 unsigned int limit, head;
649 unsigned long avalue;
650 int half, qlines;
651
652
653 avalue = gru_get_amo_value(cb);
654 head = gru_get_amo_value_head(cb);
655 limit = gru_get_amo_value_limit(cb);
656
657 qlines = mqd->qlines;
658 half = (limit != qlines);
659
660 if (half)
661 mqh = gru_mesq_head(qlines / 2 + 1, qlines);
662 else
663 mqh = gru_mesq_head(2, qlines / 2 + 1);
664
665
666 gru_gamir(cb, EOP_IR_CLR, HSTATUS(mqd->mq_gpa, half), XTYPE_DW, IMA);
667 if (gru_wait(cb) != CBS_IDLE)
668 goto cberr;
669 if (!gru_get_amo_value(cb)) {
670 STAT(mesq_qf_locked);
671 return MQE_QUEUE_FULL;
672 }
673
674
675 if (head != limit) {
676 if (send_noop_message(cb, mqd, mesg)) {
677 gru_gamir(cb, EOP_IR_INC, HSTATUS(mqd->mq_gpa, half),
678 XTYPE_DW, IMA);
679 if (gru_wait(cb) != CBS_IDLE)
680 goto cberr;
681 STAT(mesq_qf_noop_not_full);
682 return MQIE_AGAIN;
683 }
684 avalue++;
685 }
686
687
688 gru_gamer(cb, EOP_ERR_CSWAP, mqd->mq_gpa, XTYPE_DW, mqh.val, avalue,
689 IMA);
690 if (gru_wait(cb) != CBS_IDLE)
691 goto cberr;
692
693
694 if (gru_get_amo_value(cb) != avalue) {
695 STAT(mesq_qf_switch_head_failed);
696 gru_gamir(cb, EOP_IR_INC, HSTATUS(mqd->mq_gpa, half), XTYPE_DW,
697 IMA);
698 if (gru_wait(cb) != CBS_IDLE)
699 goto cberr;
700 }
701 return MQIE_AGAIN;
702cberr:
703 STAT(mesq_qf_unexpected_error);
704 return MQE_UNEXPECTED_CB_ERR;
705}
706
707
708
709
710
711
712
713static int send_message_put_nacked(void *cb, struct gru_message_queue_desc *mqd,
714 void *mesg, int lines)
715{
716 unsigned long m, *val = mesg, gpa, save;
717 int ret;
718
719 m = mqd->mq_gpa + (gru_get_amo_value_head(cb) << 6);
720 if (lines == 2) {
721 gru_vset(cb, m, 0, XTYPE_CL, lines, 1, IMA);
722 if (gru_wait(cb) != CBS_IDLE)
723 return MQE_UNEXPECTED_CB_ERR;
724 }
725 gru_vstore(cb, m, gru_get_tri(mesg), XTYPE_CL, lines, 1, IMA);
726 if (gru_wait(cb) != CBS_IDLE)
727 return MQE_UNEXPECTED_CB_ERR;
728
729 if (!mqd->interrupt_vector)
730 return MQE_OK;
731
732
733
734
735
736
737
738
739 gpa = uv_global_gru_mmr_address(mqd->interrupt_pnode, UVH_IPI_INT);
740 save = *val;
741 *val = uv_hub_ipi_value(mqd->interrupt_apicid, mqd->interrupt_vector,
742 dest_Fixed);
743 gru_vstore_phys(cb, gpa, gru_get_tri(mesg), IAA_REGISTER, IMA);
744 ret = gru_wait(cb);
745 *val = save;
746 if (ret != CBS_IDLE)
747 return MQE_UNEXPECTED_CB_ERR;
748 return MQE_OK;
749}
750
751
752
753
754
755static int send_message_failure(void *cb, struct gru_message_queue_desc *mqd,
756 void *mesg, int lines)
757{
758 int substatus, ret = 0;
759
760 substatus = gru_get_cb_message_queue_substatus(cb);
761 switch (substatus) {
762 case CBSS_NO_ERROR:
763 STAT(mesq_send_unexpected_error);
764 ret = MQE_UNEXPECTED_CB_ERR;
765 break;
766 case CBSS_LB_OVERFLOWED:
767 STAT(mesq_send_lb_overflow);
768 ret = MQE_CONGESTION;
769 break;
770 case CBSS_QLIMIT_REACHED:
771 STAT(mesq_send_qlimit_reached);
772 ret = send_message_queue_full(cb, mqd, mesg, lines);
773 break;
774 case CBSS_AMO_NACKED:
775 STAT(mesq_send_amo_nacked);
776 ret = MQE_CONGESTION;
777 break;
778 case CBSS_PUT_NACKED:
779 STAT(mesq_send_put_nacked);
780 ret = send_message_put_nacked(cb, mqd, mesg, lines);
781 break;
782 case CBSS_PAGE_OVERFLOW:
783 STAT(mesq_page_overflow);
784
785 default:
786 BUG();
787 }
788 return ret;
789}
790
791
792
793
794
795
796
797int gru_send_message_gpa(struct gru_message_queue_desc *mqd, void *mesg,
798 unsigned int bytes)
799{
800 struct message_header *mhdr;
801 void *cb;
802 void *dsr;
803 int istatus, clines, ret;
804
805 STAT(mesq_send);
806 BUG_ON(bytes < sizeof(int) || bytes > 2 * GRU_CACHE_LINE_BYTES);
807
808 clines = DIV_ROUND_UP(bytes, GRU_CACHE_LINE_BYTES);
809 if (gru_get_cpu_resources(bytes, &cb, &dsr))
810 return MQE_BUG_NO_RESOURCES;
811 memcpy(dsr, mesg, bytes);
812 mhdr = dsr;
813 mhdr->present = MQS_FULL;
814 mhdr->lines = clines;
815 if (clines == 2) {
816 mhdr->present2 = get_present2(mhdr);
817 restore_present2(mhdr, MQS_FULL);
818 }
819
820 do {
821 ret = MQE_OK;
822 gru_mesq(cb, mqd->mq_gpa, gru_get_tri(mhdr), clines, IMA);
823 istatus = gru_wait(cb);
824 if (istatus != CBS_IDLE)
825 ret = send_message_failure(cb, mqd, dsr, clines);
826 } while (ret == MQIE_AGAIN);
827 gru_free_cpu_resources(cb, dsr);
828
829 if (ret)
830 STAT(mesq_send_failed);
831 return ret;
832}
833EXPORT_SYMBOL_GPL(gru_send_message_gpa);
834
835
836
837
838void gru_free_message(struct gru_message_queue_desc *mqd, void *mesg)
839{
840 struct message_queue *mq = mqd->mq;
841 struct message_header *mhdr = mq->next;
842 void *next, *pnext;
843 int half = -1;
844 int lines = mhdr->lines;
845
846 if (lines == 2)
847 restore_present2(mhdr, MQS_EMPTY);
848 mhdr->present = MQS_EMPTY;
849
850 pnext = mq->next;
851 next = pnext + GRU_CACHE_LINE_BYTES * lines;
852 if (next == mq->limit) {
853 next = mq->start;
854 half = 1;
855 } else if (pnext < mq->start2 && next >= mq->start2) {
856 half = 0;
857 }
858
859 if (half >= 0)
860 mq->hstatus[half] = 1;
861 mq->next = next;
862}
863EXPORT_SYMBOL_GPL(gru_free_message);
864
865
866
867
868
869
870void *gru_get_next_message(struct gru_message_queue_desc *mqd)
871{
872 struct message_queue *mq = mqd->mq;
873 struct message_header *mhdr = mq->next;
874 int present = mhdr->present;
875
876
877 while (present == MQS_NOOP) {
878 gru_free_message(mqd, mhdr);
879 mhdr = mq->next;
880 present = mhdr->present;
881 }
882
883
884 if (present == MQS_FULL && mhdr->lines == 2 &&
885 get_present2(mhdr) == MQS_EMPTY)
886 present = MQS_EMPTY;
887
888 if (!present) {
889 STAT(mesq_receive_none);
890 return NULL;
891 }
892
893 if (mhdr->lines == 2)
894 restore_present2(mhdr, mhdr->present2);
895
896 STAT(mesq_receive);
897 return mhdr;
898}
899EXPORT_SYMBOL_GPL(gru_get_next_message);
900
901
902
903
904
905
906int gru_read_gpa(unsigned long *value, unsigned long gpa)
907{
908 void *cb;
909 void *dsr;
910 int ret, iaa;
911
912 STAT(read_gpa);
913 if (gru_get_cpu_resources(GRU_NUM_KERNEL_DSR_BYTES, &cb, &dsr))
914 return MQE_BUG_NO_RESOURCES;
915 iaa = gpa >> 62;
916 gru_vload_phys(cb, gpa, gru_get_tri(dsr), iaa, IMA);
917 ret = gru_wait(cb);
918 if (ret == CBS_IDLE)
919 *value = *(unsigned long *)dsr;
920 gru_free_cpu_resources(cb, dsr);
921 return ret;
922}
923EXPORT_SYMBOL_GPL(gru_read_gpa);
924
925
926
927
928
929int gru_copy_gpa(unsigned long dest_gpa, unsigned long src_gpa,
930 unsigned int bytes)
931{
932 void *cb;
933 void *dsr;
934 int ret;
935
936 STAT(copy_gpa);
937 if (gru_get_cpu_resources(GRU_NUM_KERNEL_DSR_BYTES, &cb, &dsr))
938 return MQE_BUG_NO_RESOURCES;
939 gru_bcopy(cb, src_gpa, dest_gpa, gru_get_tri(dsr),
940 XTYPE_B, bytes, GRU_NUM_KERNEL_DSR_CL, IMA);
941 ret = gru_wait(cb);
942 gru_free_cpu_resources(cb, dsr);
943 return ret;
944}
945EXPORT_SYMBOL_GPL(gru_copy_gpa);
946
947
948
949
950static int quicktest0(unsigned long arg)
951{
952 unsigned long word0;
953 unsigned long word1;
954 void *cb;
955 void *dsr;
956 unsigned long *p;
957 int ret = -EIO;
958
959 if (gru_get_cpu_resources(GRU_CACHE_LINE_BYTES, &cb, &dsr))
960 return MQE_BUG_NO_RESOURCES;
961 p = dsr;
962 word0 = MAGIC;
963 word1 = 0;
964
965 gru_vload(cb, uv_gpa(&word0), gru_get_tri(dsr), XTYPE_DW, 1, 1, IMA);
966 if (gru_wait(cb) != CBS_IDLE) {
967 printk(KERN_DEBUG "GRU:%d quicktest0: CBR failure 1\n", smp_processor_id());
968 goto done;
969 }
970
971 if (*p != MAGIC) {
972 printk(KERN_DEBUG "GRU:%d quicktest0 bad magic 0x%lx\n", smp_processor_id(), *p);
973 goto done;
974 }
975 gru_vstore(cb, uv_gpa(&word1), gru_get_tri(dsr), XTYPE_DW, 1, 1, IMA);
976 if (gru_wait(cb) != CBS_IDLE) {
977 printk(KERN_DEBUG "GRU:%d quicktest0: CBR failure 2\n", smp_processor_id());
978 goto done;
979 }
980
981 if (word0 != word1 || word1 != MAGIC) {
982 printk(KERN_DEBUG
983 "GRU:%d quicktest0 err: found 0x%lx, expected 0x%lx\n",
984 smp_processor_id(), word1, MAGIC);
985 goto done;
986 }
987 ret = 0;
988
989done:
990 gru_free_cpu_resources(cb, dsr);
991 return ret;
992}
993
994#define ALIGNUP(p, q) ((void *)(((unsigned long)(p) + (q) - 1) & ~(q - 1)))
995
996static int quicktest1(unsigned long arg)
997{
998 struct gru_message_queue_desc mqd;
999 void *p, *mq;
1000 unsigned long *dw;
1001 int i, ret = -EIO;
1002 char mes[GRU_CACHE_LINE_BYTES], *m;
1003
1004
1005 p = kmalloc(4096, 0);
1006 if (p == NULL)
1007 return -ENOMEM;
1008 mq = ALIGNUP(p, 1024);
1009 memset(mes, 0xee, sizeof(mes));
1010 dw = mq;
1011
1012 gru_create_message_queue(&mqd, mq, 8 * GRU_CACHE_LINE_BYTES, 0, 0, 0);
1013 for (i = 0; i < 6; i++) {
1014 mes[8] = i;
1015 do {
1016 ret = gru_send_message_gpa(&mqd, mes, sizeof(mes));
1017 } while (ret == MQE_CONGESTION);
1018 if (ret)
1019 break;
1020 }
1021 if (ret != MQE_QUEUE_FULL || i != 4) {
1022 printk(KERN_DEBUG "GRU:%d quicktest1: unexpect status %d, i %d\n",
1023 smp_processor_id(), ret, i);
1024 goto done;
1025 }
1026
1027 for (i = 0; i < 6; i++) {
1028 m = gru_get_next_message(&mqd);
1029 if (!m || m[8] != i)
1030 break;
1031 gru_free_message(&mqd, m);
1032 }
1033 if (i != 4) {
1034 printk(KERN_DEBUG "GRU:%d quicktest2: bad message, i %d, m %p, m8 %d\n",
1035 smp_processor_id(), i, m, m ? m[8] : -1);
1036 goto done;
1037 }
1038 ret = 0;
1039
1040done:
1041 kfree(p);
1042 return ret;
1043}
1044
1045static int quicktest2(unsigned long arg)
1046{
1047 static DECLARE_COMPLETION(cmp);
1048 unsigned long han;
1049 int blade_id = 0;
1050 int numcb = 4;
1051 int ret = 0;
1052 unsigned long *buf;
1053 void *cb0, *cb;
1054 struct gru_control_block_status *gen;
1055 int i, k, istatus, bytes;
1056
1057 bytes = numcb * 4 * 8;
1058 buf = kmalloc(bytes, GFP_KERNEL);
1059 if (!buf)
1060 return -ENOMEM;
1061
1062 ret = -EBUSY;
1063 han = gru_reserve_async_resources(blade_id, numcb, 0, &cmp);
1064 if (!han)
1065 goto done;
1066
1067 gru_lock_async_resource(han, &cb0, NULL);
1068 memset(buf, 0xee, bytes);
1069 for (i = 0; i < numcb; i++)
1070 gru_vset(cb0 + i * GRU_HANDLE_STRIDE, uv_gpa(&buf[i * 4]), 0,
1071 XTYPE_DW, 4, 1, IMA_INTERRUPT);
1072
1073 ret = 0;
1074 k = numcb;
1075 do {
1076 gru_wait_async_cbr(han);
1077 for (i = 0; i < numcb; i++) {
1078 cb = cb0 + i * GRU_HANDLE_STRIDE;
1079 istatus = gru_check_status(cb);
1080 if (istatus != CBS_ACTIVE && istatus != CBS_CALL_OS)
1081 break;
1082 }
1083 if (i == numcb)
1084 continue;
1085 if (istatus != CBS_IDLE) {
1086 printk(KERN_DEBUG "GRU:%d quicktest2: cb %d, exception\n", smp_processor_id(), i);
1087 ret = -EFAULT;
1088 } else if (buf[4 * i] || buf[4 * i + 1] || buf[4 * i + 2] ||
1089 buf[4 * i + 3]) {
1090 printk(KERN_DEBUG "GRU:%d quicktest2:cb %d, buf 0x%lx, 0x%lx, 0x%lx, 0x%lx\n",
1091 smp_processor_id(), i, buf[4 * i], buf[4 * i + 1], buf[4 * i + 2], buf[4 * i + 3]);
1092 ret = -EIO;
1093 }
1094 k--;
1095 gen = cb;
1096 gen->istatus = CBS_CALL_OS;
1097 } while (k);
1098 BUG_ON(cmp.done);
1099
1100 gru_unlock_async_resource(han);
1101 gru_release_async_resources(han);
1102done:
1103 kfree(buf);
1104 return ret;
1105}
1106
1107#define BUFSIZE 200
1108static int quicktest3(unsigned long arg)
1109{
1110 char buf1[BUFSIZE], buf2[BUFSIZE];
1111 int ret = 0;
1112
1113 memset(buf2, 0, sizeof(buf2));
1114 memset(buf1, get_cycles() & 255, sizeof(buf1));
1115 gru_copy_gpa(uv_gpa(buf2), uv_gpa(buf1), BUFSIZE);
1116 if (memcmp(buf1, buf2, BUFSIZE)) {
1117 printk(KERN_DEBUG "GRU:%d quicktest3 error\n", smp_processor_id());
1118 ret = -EIO;
1119 }
1120 return ret;
1121}
1122
1123
1124
1125
1126
1127int gru_ktest(unsigned long arg)
1128{
1129 int ret = -EINVAL;
1130
1131 switch (arg & 0xff) {
1132 case 0:
1133 ret = quicktest0(arg);
1134 break;
1135 case 1:
1136 ret = quicktest1(arg);
1137 break;
1138 case 2:
1139 ret = quicktest2(arg);
1140 break;
1141 case 3:
1142 ret = quicktest3(arg);
1143 break;
1144 case 99:
1145 ret = gru_free_kernel_contexts();
1146 break;
1147 }
1148 return ret;
1149
1150}
1151
1152int gru_kservices_init(void)
1153{
1154 return 0;
1155}
1156
1157void gru_kservices_exit(void)
1158{
1159 if (gru_free_kernel_contexts())
1160 BUG();
1161}
1162
1163