diff options
author | Jack Steiner <steiner@sgi.com> | 2008-07-30 01:33:57 -0400 |
---|---|---|
committer | Linus Torvalds <torvalds@linux-foundation.org> | 2008-07-30 12:41:48 -0400 |
commit | 28bffaf094a6d0992c85e1b01f04c9b0f56c9d62 (patch) | |
tree | 31912d0046ebb352287d53c6e0a99bfd42d0778b /drivers/misc/sgi-gru/grukservices.c | |
parent | 142586409c8be7dc071bb94d7cd2d69ccfd99b6b (diff) |
GRU Driver: kernel services provide by driver
This file contains functions for handling services provided to other
kernel modules that use the GRU.
Signed-off-by: Jack Steiner <steiner@sgi.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/misc/sgi-gru/grukservices.c')
-rw-r--r-- | drivers/misc/sgi-gru/grukservices.c | 679 |
1 files changed, 679 insertions, 0 deletions
diff --git a/drivers/misc/sgi-gru/grukservices.c b/drivers/misc/sgi-gru/grukservices.c new file mode 100644 index 000000000000..234d165fb11e --- /dev/null +++ b/drivers/misc/sgi-gru/grukservices.c | |||
@@ -0,0 +1,679 @@ | |||
1 | /* | ||
2 | * SN Platform GRU Driver | ||
3 | * | ||
4 | * KERNEL SERVICES THAT USE THE GRU | ||
5 | * | ||
6 | * Copyright (c) 2008 Silicon Graphics, Inc. All Rights Reserved. | ||
7 | * | ||
8 | * This program is free software; you can redistribute it and/or modify | ||
9 | * it under the terms of the GNU General Public License as published by | ||
10 | * the Free Software Foundation; either version 2 of the License, or | ||
11 | * (at your option) any later version. | ||
12 | * | ||
13 | * This program is distributed in the hope that it will be useful, | ||
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
16 | * GNU General Public License for more details. | ||
17 | * | ||
18 | * You should have received a copy of the GNU General Public License | ||
19 | * along with this program; if not, write to the Free Software | ||
20 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | ||
21 | */ | ||
22 | |||
23 | #include <linux/kernel.h> | ||
24 | #include <linux/errno.h> | ||
25 | #include <linux/slab.h> | ||
26 | #include <linux/mm.h> | ||
27 | #include <linux/smp_lock.h> | ||
28 | #include <linux/spinlock.h> | ||
29 | #include <linux/device.h> | ||
30 | #include <linux/miscdevice.h> | ||
31 | #include <linux/proc_fs.h> | ||
32 | #include <linux/interrupt.h> | ||
33 | #include <linux/uaccess.h> | ||
34 | #include "gru.h" | ||
35 | #include "grulib.h" | ||
36 | #include "grutables.h" | ||
37 | #include "grukservices.h" | ||
38 | #include "gru_instructions.h" | ||
39 | #include <asm/uv/uv_hub.h> | ||
40 | |||
41 | /* | ||
42 | * Kernel GRU Usage | ||
43 | * | ||
44 | * The following is an interim algorithm for management of kernel GRU | ||
45 | * resources. This will likely be replaced when we better understand the | ||
46 | * kernel/user requirements. | ||
47 | * | ||
48 | * At boot time, the kernel permanently reserves a fixed number of | ||
49 | * CBRs/DSRs for each cpu to use. The resources are all taken from | ||
50 | * the GRU chiplet 1 on the blade. This leaves the full set of resources | ||
51 | * of chiplet 0 available to be allocated to a single user. | ||
52 | */ | ||
53 | |||
54 | /* Blade percpu resources PERMANENTLY reserved for kernel use */ | ||
55 | #define GRU_NUM_KERNEL_CBR 1 | ||
56 | #define GRU_NUM_KERNEL_DSR_BYTES 256 | ||
57 | #define KERNEL_CTXNUM 15 | ||
58 | |||
59 | /* GRU instruction attributes for all instructions */ | ||
60 | #define IMA IMA_CB_DELAY | ||
61 | |||
62 | /* GRU cacheline size is always 64 bytes - even on arches with 128 byte lines */ | ||
63 | #define __gru_cacheline_aligned__ \ | ||
64 | __attribute__((__aligned__(GRU_CACHE_LINE_BYTES))) | ||
65 | |||
66 | #define MAGIC 0x1234567887654321UL | ||
67 | |||
68 | /* Default retry count for GRU errors on kernel instructions */ | ||
69 | #define EXCEPTION_RETRY_LIMIT 3 | ||
70 | |||
71 | /* Status of message queue sections */ | ||
72 | #define MQS_EMPTY 0 | ||
73 | #define MQS_FULL 1 | ||
74 | #define MQS_NOOP 2 | ||
75 | |||
76 | /*----------------- RESOURCE MANAGEMENT -------------------------------------*/ | ||
77 | /* optimized for x86_64 */ | ||
78 | struct message_queue { | ||
79 | union gru_mesqhead head __gru_cacheline_aligned__; /* CL 0 */ | ||
80 | int qlines; /* DW 1 */ | ||
81 | long hstatus[2]; | ||
82 | void *next __gru_cacheline_aligned__;/* CL 1 */ | ||
83 | void *limit; | ||
84 | void *start; | ||
85 | void *start2; | ||
86 | char data ____cacheline_aligned; /* CL 2 */ | ||
87 | }; | ||
88 | |||
89 | /* First word in every message - used by mesq interface */ | ||
90 | struct message_header { | ||
91 | char present; | ||
92 | char present2; | ||
93 | char lines; | ||
94 | char fill; | ||
95 | }; | ||
96 | |||
97 | #define QLINES(mq) ((mq) + offsetof(struct message_queue, qlines)) | ||
98 | #define HSTATUS(mq, h) ((mq) + offsetof(struct message_queue, hstatus[h])) | ||
99 | |||
100 | static int gru_get_cpu_resources(int dsr_bytes, void **cb, void **dsr) | ||
101 | { | ||
102 | struct gru_blade_state *bs; | ||
103 | int lcpu; | ||
104 | |||
105 | BUG_ON(dsr_bytes > GRU_NUM_KERNEL_DSR_BYTES); | ||
106 | preempt_disable(); | ||
107 | bs = gru_base[uv_numa_blade_id()]; | ||
108 | lcpu = uv_blade_processor_id(); | ||
109 | *cb = bs->kernel_cb + lcpu * GRU_HANDLE_STRIDE; | ||
110 | *dsr = bs->kernel_dsr + lcpu * GRU_NUM_KERNEL_DSR_BYTES; | ||
111 | return 0; | ||
112 | } | ||
113 | |||
114 | static void gru_free_cpu_resources(void *cb, void *dsr) | ||
115 | { | ||
116 | preempt_enable(); | ||
117 | } | ||
118 | |||
119 | int gru_get_cb_exception_detail(void *cb, | ||
120 | struct control_block_extended_exc_detail *excdet) | ||
121 | { | ||
122 | struct gru_control_block_extended *cbe; | ||
123 | |||
124 | cbe = get_cbe(GRUBASE(cb), get_cb_number(cb)); | ||
125 | excdet->opc = cbe->opccpy; | ||
126 | excdet->exopc = cbe->exopccpy; | ||
127 | excdet->ecause = cbe->ecause; | ||
128 | excdet->exceptdet0 = cbe->idef1upd; | ||
129 | excdet->exceptdet1 = cbe->idef3upd; | ||
130 | return 0; | ||
131 | } | ||
132 | |||
133 | char *gru_get_cb_exception_detail_str(int ret, void *cb, | ||
134 | char *buf, int size) | ||
135 | { | ||
136 | struct gru_control_block_status *gen = (void *)cb; | ||
137 | struct control_block_extended_exc_detail excdet; | ||
138 | |||
139 | if (ret > 0 && gen->istatus == CBS_EXCEPTION) { | ||
140 | gru_get_cb_exception_detail(cb, &excdet); | ||
141 | snprintf(buf, size, | ||
142 | "GRU exception: cb %p, opc %d, exopc %d, ecause 0x%x," | ||
143 | "excdet0 0x%lx, excdet1 0x%x", | ||
144 | gen, excdet.opc, excdet.exopc, excdet.ecause, | ||
145 | excdet.exceptdet0, excdet.exceptdet1); | ||
146 | } else { | ||
147 | snprintf(buf, size, "No exception"); | ||
148 | } | ||
149 | return buf; | ||
150 | } | ||
151 | |||
152 | static int gru_wait_idle_or_exception(struct gru_control_block_status *gen) | ||
153 | { | ||
154 | while (gen->istatus >= CBS_ACTIVE) { | ||
155 | cpu_relax(); | ||
156 | barrier(); | ||
157 | } | ||
158 | return gen->istatus; | ||
159 | } | ||
160 | |||
161 | static int gru_retry_exception(void *cb) | ||
162 | { | ||
163 | struct gru_control_block_status *gen = (void *)cb; | ||
164 | struct control_block_extended_exc_detail excdet; | ||
165 | int retry = EXCEPTION_RETRY_LIMIT; | ||
166 | |||
167 | while (1) { | ||
168 | if (gru_get_cb_message_queue_substatus(cb)) | ||
169 | break; | ||
170 | if (gru_wait_idle_or_exception(gen) == CBS_IDLE) | ||
171 | return CBS_IDLE; | ||
172 | |||
173 | gru_get_cb_exception_detail(cb, &excdet); | ||
174 | if (excdet.ecause & ~EXCEPTION_RETRY_BITS) | ||
175 | break; | ||
176 | if (retry-- == 0) | ||
177 | break; | ||
178 | gen->icmd = 1; | ||
179 | gru_flush_cache(gen); | ||
180 | } | ||
181 | return CBS_EXCEPTION; | ||
182 | } | ||
183 | |||
184 | int gru_check_status_proc(void *cb) | ||
185 | { | ||
186 | struct gru_control_block_status *gen = (void *)cb; | ||
187 | int ret; | ||
188 | |||
189 | ret = gen->istatus; | ||
190 | if (ret != CBS_EXCEPTION) | ||
191 | return ret; | ||
192 | return gru_retry_exception(cb); | ||
193 | |||
194 | } | ||
195 | |||
196 | int gru_wait_proc(void *cb) | ||
197 | { | ||
198 | struct gru_control_block_status *gen = (void *)cb; | ||
199 | int ret; | ||
200 | |||
201 | ret = gru_wait_idle_or_exception(gen); | ||
202 | if (ret == CBS_EXCEPTION) | ||
203 | ret = gru_retry_exception(cb); | ||
204 | |||
205 | return ret; | ||
206 | } | ||
207 | |||
208 | void gru_abort(int ret, void *cb, char *str) | ||
209 | { | ||
210 | char buf[GRU_EXC_STR_SIZE]; | ||
211 | |||
212 | panic("GRU FATAL ERROR: %s - %s\n", str, | ||
213 | gru_get_cb_exception_detail_str(ret, cb, buf, sizeof(buf))); | ||
214 | } | ||
215 | |||
216 | void gru_wait_abort_proc(void *cb) | ||
217 | { | ||
218 | int ret; | ||
219 | |||
220 | ret = gru_wait_proc(cb); | ||
221 | if (ret) | ||
222 | gru_abort(ret, cb, "gru_wait_abort"); | ||
223 | } | ||
224 | |||
225 | |||
226 | /*------------------------------ MESSAGE QUEUES -----------------------------*/ | ||
227 | |||
228 | /* Internal status . These are NOT returned to the user. */ | ||
229 | #define MQIE_AGAIN -1 /* try again */ | ||
230 | |||
231 | |||
232 | /* | ||
233 | * Save/restore the "present" flag that is in the second line of 2-line | ||
234 | * messages | ||
235 | */ | ||
236 | static inline int get_present2(void *p) | ||
237 | { | ||
238 | struct message_header *mhdr = p + GRU_CACHE_LINE_BYTES; | ||
239 | return mhdr->present; | ||
240 | } | ||
241 | |||
242 | static inline void restore_present2(void *p, int val) | ||
243 | { | ||
244 | struct message_header *mhdr = p + GRU_CACHE_LINE_BYTES; | ||
245 | mhdr->present = val; | ||
246 | } | ||
247 | |||
248 | /* | ||
249 | * Create a message queue. | ||
250 | * qlines - message queue size in cache lines. Includes 2-line header. | ||
251 | */ | ||
252 | int gru_create_message_queue(void *p, unsigned int bytes) | ||
253 | { | ||
254 | struct message_queue *mq = p; | ||
255 | unsigned int qlines; | ||
256 | |||
257 | qlines = bytes / GRU_CACHE_LINE_BYTES - 2; | ||
258 | memset(mq, 0, bytes); | ||
259 | mq->start = &mq->data; | ||
260 | mq->start2 = &mq->data + (qlines / 2 - 1) * GRU_CACHE_LINE_BYTES; | ||
261 | mq->next = &mq->data; | ||
262 | mq->limit = &mq->data + (qlines - 2) * GRU_CACHE_LINE_BYTES; | ||
263 | mq->qlines = qlines; | ||
264 | mq->hstatus[0] = 0; | ||
265 | mq->hstatus[1] = 1; | ||
266 | mq->head = gru_mesq_head(2, qlines / 2 + 1); | ||
267 | return 0; | ||
268 | } | ||
269 | EXPORT_SYMBOL_GPL(gru_create_message_queue); | ||
270 | |||
271 | /* | ||
272 | * Send a NOOP message to a message queue | ||
273 | * Returns: | ||
274 | * 0 - if queue is full after the send. This is the normal case | ||
275 | * but various races can change this. | ||
276 | * -1 - if mesq sent successfully but queue not full | ||
277 | * >0 - unexpected error. MQE_xxx returned | ||
278 | */ | ||
279 | static int send_noop_message(void *cb, | ||
280 | unsigned long mq, void *mesg) | ||
281 | { | ||
282 | const struct message_header noop_header = { | ||
283 | .present = MQS_NOOP, .lines = 1}; | ||
284 | unsigned long m; | ||
285 | int substatus, ret; | ||
286 | struct message_header save_mhdr, *mhdr = mesg; | ||
287 | |||
288 | STAT(mesq_noop); | ||
289 | save_mhdr = *mhdr; | ||
290 | *mhdr = noop_header; | ||
291 | gru_mesq(cb, mq, gru_get_tri(mhdr), 1, IMA); | ||
292 | ret = gru_wait(cb); | ||
293 | |||
294 | if (ret) { | ||
295 | substatus = gru_get_cb_message_queue_substatus(cb); | ||
296 | switch (substatus) { | ||
297 | case CBSS_NO_ERROR: | ||
298 | STAT(mesq_noop_unexpected_error); | ||
299 | ret = MQE_UNEXPECTED_CB_ERR; | ||
300 | break; | ||
301 | case CBSS_LB_OVERFLOWED: | ||
302 | STAT(mesq_noop_lb_overflow); | ||
303 | ret = MQE_CONGESTION; | ||
304 | break; | ||
305 | case CBSS_QLIMIT_REACHED: | ||
306 | STAT(mesq_noop_qlimit_reached); | ||
307 | ret = 0; | ||
308 | break; | ||
309 | case CBSS_AMO_NACKED: | ||
310 | STAT(mesq_noop_amo_nacked); | ||
311 | ret = MQE_CONGESTION; | ||
312 | break; | ||
313 | case CBSS_PUT_NACKED: | ||
314 | STAT(mesq_noop_put_nacked); | ||
315 | m = mq + (gru_get_amo_value_head(cb) << 6); | ||
316 | gru_vstore(cb, m, gru_get_tri(mesg), XTYPE_CL, 1, 1, | ||
317 | IMA); | ||
318 | if (gru_wait(cb) == CBS_IDLE) | ||
319 | ret = MQIE_AGAIN; | ||
320 | else | ||
321 | ret = MQE_UNEXPECTED_CB_ERR; | ||
322 | break; | ||
323 | case CBSS_PAGE_OVERFLOW: | ||
324 | default: | ||
325 | BUG(); | ||
326 | } | ||
327 | } | ||
328 | *mhdr = save_mhdr; | ||
329 | return ret; | ||
330 | } | ||
331 | |||
332 | /* | ||
333 | * Handle a gru_mesq full. | ||
334 | */ | ||
335 | static int send_message_queue_full(void *cb, | ||
336 | unsigned long mq, void *mesg, int lines) | ||
337 | { | ||
338 | union gru_mesqhead mqh; | ||
339 | unsigned int limit, head; | ||
340 | unsigned long avalue; | ||
341 | int half, qlines, save; | ||
342 | |||
343 | /* Determine if switching to first/second half of q */ | ||
344 | avalue = gru_get_amo_value(cb); | ||
345 | head = gru_get_amo_value_head(cb); | ||
346 | limit = gru_get_amo_value_limit(cb); | ||
347 | |||
348 | /* | ||
349 | * Fetch "qlines" from the queue header. Since the queue may be | ||
350 | * in memory that can't be accessed using socket addresses, use | ||
351 | * the GRU to access the data. Use DSR space from the message. | ||
352 | */ | ||
353 | save = *(int *)mesg; | ||
354 | gru_vload(cb, QLINES(mq), gru_get_tri(mesg), XTYPE_W, 1, 1, IMA); | ||
355 | if (gru_wait(cb) != CBS_IDLE) | ||
356 | goto cberr; | ||
357 | qlines = *(int *)mesg; | ||
358 | *(int *)mesg = save; | ||
359 | half = (limit != qlines); | ||
360 | |||
361 | if (half) | ||
362 | mqh = gru_mesq_head(qlines / 2 + 1, qlines); | ||
363 | else | ||
364 | mqh = gru_mesq_head(2, qlines / 2 + 1); | ||
365 | |||
366 | /* Try to get lock for switching head pointer */ | ||
367 | gru_gamir(cb, EOP_IR_CLR, HSTATUS(mq, half), XTYPE_DW, IMA); | ||
368 | if (gru_wait(cb) != CBS_IDLE) | ||
369 | goto cberr; | ||
370 | if (!gru_get_amo_value(cb)) { | ||
371 | STAT(mesq_qf_locked); | ||
372 | return MQE_QUEUE_FULL; | ||
373 | } | ||
374 | |||
375 | /* Got the lock. Send optional NOP if queue not full, */ | ||
376 | if (head != limit) { | ||
377 | if (send_noop_message(cb, mq, mesg)) { | ||
378 | gru_gamir(cb, EOP_IR_INC, HSTATUS(mq, half), | ||
379 | XTYPE_DW, IMA); | ||
380 | if (gru_wait(cb) != CBS_IDLE) | ||
381 | goto cberr; | ||
382 | STAT(mesq_qf_noop_not_full); | ||
383 | return MQIE_AGAIN; | ||
384 | } | ||
385 | avalue++; | ||
386 | } | ||
387 | |||
388 | /* Then flip queuehead to other half of queue. */ | ||
389 | gru_gamer(cb, EOP_ERR_CSWAP, mq, XTYPE_DW, mqh.val, avalue, IMA); | ||
390 | if (gru_wait(cb) != CBS_IDLE) | ||
391 | goto cberr; | ||
392 | |||
393 | /* If not successfully in swapping queue head, clear the hstatus lock */ | ||
394 | if (gru_get_amo_value(cb) != avalue) { | ||
395 | STAT(mesq_qf_switch_head_failed); | ||
396 | gru_gamir(cb, EOP_IR_INC, HSTATUS(mq, half), XTYPE_DW, IMA); | ||
397 | if (gru_wait(cb) != CBS_IDLE) | ||
398 | goto cberr; | ||
399 | } | ||
400 | return MQIE_AGAIN; | ||
401 | cberr: | ||
402 | STAT(mesq_qf_unexpected_error); | ||
403 | return MQE_UNEXPECTED_CB_ERR; | ||
404 | } | ||
405 | |||
406 | |||
407 | /* | ||
408 | * Handle a gru_mesq failure. Some of these failures are software recoverable | ||
409 | * or retryable. | ||
410 | */ | ||
411 | static int send_message_failure(void *cb, | ||
412 | unsigned long mq, | ||
413 | void *mesg, | ||
414 | int lines) | ||
415 | { | ||
416 | int substatus, ret = 0; | ||
417 | unsigned long m; | ||
418 | |||
419 | substatus = gru_get_cb_message_queue_substatus(cb); | ||
420 | switch (substatus) { | ||
421 | case CBSS_NO_ERROR: | ||
422 | STAT(mesq_send_unexpected_error); | ||
423 | ret = MQE_UNEXPECTED_CB_ERR; | ||
424 | break; | ||
425 | case CBSS_LB_OVERFLOWED: | ||
426 | STAT(mesq_send_lb_overflow); | ||
427 | ret = MQE_CONGESTION; | ||
428 | break; | ||
429 | case CBSS_QLIMIT_REACHED: | ||
430 | STAT(mesq_send_qlimit_reached); | ||
431 | ret = send_message_queue_full(cb, mq, mesg, lines); | ||
432 | break; | ||
433 | case CBSS_AMO_NACKED: | ||
434 | STAT(mesq_send_amo_nacked); | ||
435 | ret = MQE_CONGESTION; | ||
436 | break; | ||
437 | case CBSS_PUT_NACKED: | ||
438 | STAT(mesq_send_put_nacked); | ||
439 | m =mq + (gru_get_amo_value_head(cb) << 6); | ||
440 | gru_vstore(cb, m, gru_get_tri(mesg), XTYPE_CL, lines, 1, IMA); | ||
441 | if (gru_wait(cb) == CBS_IDLE) | ||
442 | ret = MQE_OK; | ||
443 | else | ||
444 | ret = MQE_UNEXPECTED_CB_ERR; | ||
445 | break; | ||
446 | default: | ||
447 | BUG(); | ||
448 | } | ||
449 | return ret; | ||
450 | } | ||
451 | |||
452 | /* | ||
453 | * Send a message to a message queue | ||
454 | * cb GRU control block to use to send message | ||
455 | * mq message queue | ||
456 | * mesg message. ust be vaddr within a GSEG | ||
457 | * bytes message size (<= 2 CL) | ||
458 | */ | ||
459 | int gru_send_message_gpa(unsigned long mq, void *mesg, unsigned int bytes) | ||
460 | { | ||
461 | struct message_header *mhdr; | ||
462 | void *cb; | ||
463 | void *dsr; | ||
464 | int istatus, clines, ret; | ||
465 | |||
466 | STAT(mesq_send); | ||
467 | BUG_ON(bytes < sizeof(int) || bytes > 2 * GRU_CACHE_LINE_BYTES); | ||
468 | |||
469 | clines = (bytes + GRU_CACHE_LINE_BYTES - 1) / GRU_CACHE_LINE_BYTES; | ||
470 | if (gru_get_cpu_resources(bytes, &cb, &dsr)) | ||
471 | return MQE_BUG_NO_RESOURCES; | ||
472 | memcpy(dsr, mesg, bytes); | ||
473 | mhdr = dsr; | ||
474 | mhdr->present = MQS_FULL; | ||
475 | mhdr->lines = clines; | ||
476 | if (clines == 2) { | ||
477 | mhdr->present2 = get_present2(mhdr); | ||
478 | restore_present2(mhdr, MQS_FULL); | ||
479 | } | ||
480 | |||
481 | do { | ||
482 | ret = MQE_OK; | ||
483 | gru_mesq(cb, mq, gru_get_tri(mhdr), clines, IMA); | ||
484 | istatus = gru_wait(cb); | ||
485 | if (istatus != CBS_IDLE) | ||
486 | ret = send_message_failure(cb, mq, dsr, clines); | ||
487 | } while (ret == MQIE_AGAIN); | ||
488 | gru_free_cpu_resources(cb, dsr); | ||
489 | |||
490 | if (ret) | ||
491 | STAT(mesq_send_failed); | ||
492 | return ret; | ||
493 | } | ||
494 | EXPORT_SYMBOL_GPL(gru_send_message_gpa); | ||
495 | |||
496 | /* | ||
497 | * Advance the receive pointer for the queue to the next message. | ||
498 | */ | ||
499 | void gru_free_message(void *rmq, void *mesg) | ||
500 | { | ||
501 | struct message_queue *mq = rmq; | ||
502 | struct message_header *mhdr = mq->next; | ||
503 | void *next, *pnext; | ||
504 | int half = -1; | ||
505 | int lines = mhdr->lines; | ||
506 | |||
507 | if (lines == 2) | ||
508 | restore_present2(mhdr, MQS_EMPTY); | ||
509 | mhdr->present = MQS_EMPTY; | ||
510 | |||
511 | pnext = mq->next; | ||
512 | next = pnext + GRU_CACHE_LINE_BYTES * lines; | ||
513 | if (next == mq->limit) { | ||
514 | next = mq->start; | ||
515 | half = 1; | ||
516 | } else if (pnext < mq->start2 && next >= mq->start2) { | ||
517 | half = 0; | ||
518 | } | ||
519 | |||
520 | if (half >= 0) | ||
521 | mq->hstatus[half] = 1; | ||
522 | mq->next = next; | ||
523 | } | ||
524 | EXPORT_SYMBOL_GPL(gru_free_message); | ||
525 | |||
526 | /* | ||
527 | * Get next message from message queue. Return NULL if no message | ||
528 | * present. User must call next_message() to move to next message. | ||
529 | * rmq message queue | ||
530 | */ | ||
531 | void *gru_get_next_message(void *rmq) | ||
532 | { | ||
533 | struct message_queue *mq = rmq; | ||
534 | struct message_header *mhdr = mq->next; | ||
535 | int present = mhdr->present; | ||
536 | |||
537 | /* skip NOOP messages */ | ||
538 | STAT(mesq_receive); | ||
539 | while (present == MQS_NOOP) { | ||
540 | gru_free_message(rmq, mhdr); | ||
541 | mhdr = mq->next; | ||
542 | present = mhdr->present; | ||
543 | } | ||
544 | |||
545 | /* Wait for both halves of 2 line messages */ | ||
546 | if (present == MQS_FULL && mhdr->lines == 2 && | ||
547 | get_present2(mhdr) == MQS_EMPTY) | ||
548 | present = MQS_EMPTY; | ||
549 | |||
550 | if (!present) { | ||
551 | STAT(mesq_receive_none); | ||
552 | return NULL; | ||
553 | } | ||
554 | |||
555 | if (mhdr->lines == 2) | ||
556 | restore_present2(mhdr, mhdr->present2); | ||
557 | |||
558 | return mhdr; | ||
559 | } | ||
560 | EXPORT_SYMBOL_GPL(gru_get_next_message); | ||
561 | |||
562 | /* ---------------------- GRU DATA COPY FUNCTIONS ---------------------------*/ | ||
563 | |||
564 | /* | ||
565 | * Copy a block of data using the GRU resources | ||
566 | */ | ||
567 | int gru_copy_gpa(unsigned long dest_gpa, unsigned long src_gpa, | ||
568 | unsigned int bytes) | ||
569 | { | ||
570 | void *cb; | ||
571 | void *dsr; | ||
572 | int ret; | ||
573 | |||
574 | STAT(copy_gpa); | ||
575 | if (gru_get_cpu_resources(GRU_NUM_KERNEL_DSR_BYTES, &cb, &dsr)) | ||
576 | return MQE_BUG_NO_RESOURCES; | ||
577 | gru_bcopy(cb, src_gpa, dest_gpa, gru_get_tri(dsr), | ||
578 | XTYPE_B, bytes, GRU_NUM_KERNEL_DSR_BYTES, IMA); | ||
579 | ret = gru_wait(cb); | ||
580 | gru_free_cpu_resources(cb, dsr); | ||
581 | return ret; | ||
582 | } | ||
583 | EXPORT_SYMBOL_GPL(gru_copy_gpa); | ||
584 | |||
585 | /* ------------------- KERNEL QUICKTESTS RUN AT STARTUP ----------------*/ | ||
586 | /* Temp - will delete after we gain confidence in the GRU */ | ||
587 | static __cacheline_aligned unsigned long word0; | ||
588 | static __cacheline_aligned unsigned long word1; | ||
589 | |||
590 | static int quicktest(struct gru_state *gru) | ||
591 | { | ||
592 | void *cb; | ||
593 | void *ds; | ||
594 | unsigned long *p; | ||
595 | |||
596 | cb = get_gseg_base_address_cb(gru->gs_gru_base_vaddr, KERNEL_CTXNUM, 0); | ||
597 | ds = get_gseg_base_address_ds(gru->gs_gru_base_vaddr, KERNEL_CTXNUM, 0); | ||
598 | p = ds; | ||
599 | word0 = MAGIC; | ||
600 | |||
601 | gru_vload(cb, uv_gpa(&word0), 0, XTYPE_DW, 1, 1, IMA); | ||
602 | if (gru_wait(cb) != CBS_IDLE) | ||
603 | BUG(); | ||
604 | |||
605 | if (*(unsigned long *)ds != MAGIC) | ||
606 | BUG(); | ||
607 | gru_vstore(cb, uv_gpa(&word1), 0, XTYPE_DW, 1, 1, IMA); | ||
608 | if (gru_wait(cb) != CBS_IDLE) | ||
609 | BUG(); | ||
610 | |||
611 | if (word0 != word1 || word0 != MAGIC) { | ||
612 | printk | ||
613 | ("GRU quicktest err: gru %d, found 0x%lx, expected 0x%lx\n", | ||
614 | gru->gs_gid, word1, MAGIC); | ||
615 | BUG(); /* ZZZ should not be fatal */ | ||
616 | } | ||
617 | |||
618 | return 0; | ||
619 | } | ||
620 | |||
621 | |||
622 | int gru_kservices_init(struct gru_state *gru) | ||
623 | { | ||
624 | struct gru_blade_state *bs; | ||
625 | struct gru_context_configuration_handle *cch; | ||
626 | unsigned long cbr_map, dsr_map; | ||
627 | int err, num, cpus_possible; | ||
628 | |||
629 | /* | ||
630 | * Currently, resources are reserved ONLY on the second chiplet | ||
631 | * on each blade. This leaves ALL resources on chiplet 0 available | ||
632 | * for user code. | ||
633 | */ | ||
634 | bs = gru->gs_blade; | ||
635 | if (gru != &bs->bs_grus[1]) | ||
636 | return 0; | ||
637 | |||
638 | cpus_possible = uv_blade_nr_possible_cpus(gru->gs_blade_id); | ||
639 | |||
640 | num = GRU_NUM_KERNEL_CBR * cpus_possible; | ||
641 | cbr_map = reserve_gru_cb_resources(gru, GRU_CB_COUNT_TO_AU(num), NULL); | ||
642 | gru->gs_reserved_cbrs += num; | ||
643 | |||
644 | num = GRU_NUM_KERNEL_DSR_BYTES * cpus_possible; | ||
645 | dsr_map = reserve_gru_ds_resources(gru, GRU_DS_BYTES_TO_AU(num), NULL); | ||
646 | gru->gs_reserved_dsr_bytes += num; | ||
647 | |||
648 | gru->gs_active_contexts++; | ||
649 | __set_bit(KERNEL_CTXNUM, &gru->gs_context_map); | ||
650 | cch = get_cch(gru->gs_gru_base_vaddr, KERNEL_CTXNUM); | ||
651 | |||
652 | bs->kernel_cb = get_gseg_base_address_cb(gru->gs_gru_base_vaddr, | ||
653 | KERNEL_CTXNUM, 0); | ||
654 | bs->kernel_dsr = get_gseg_base_address_ds(gru->gs_gru_base_vaddr, | ||
655 | KERNEL_CTXNUM, 0); | ||
656 | |||
657 | lock_cch_handle(cch); | ||
658 | cch->tfm_fault_bit_enable = 0; | ||
659 | cch->tlb_int_enable = 0; | ||
660 | cch->tfm_done_bit_enable = 0; | ||
661 | cch->unmap_enable = 1; | ||
662 | err = cch_allocate(cch, 0, cbr_map, dsr_map); | ||
663 | if (err) { | ||
664 | gru_dbg(grudev, | ||
665 | "Unable to allocate kernel CCH: gru %d, err %d\n", | ||
666 | gru->gs_gid, err); | ||
667 | BUG(); | ||
668 | } | ||
669 | if (cch_start(cch)) { | ||
670 | gru_dbg(grudev, "Unable to start kernel CCH: gru %d, err %d\n", | ||
671 | gru->gs_gid, err); | ||
672 | BUG(); | ||
673 | } | ||
674 | unlock_cch_handle(cch); | ||
675 | |||
676 | if (options & GRU_QUICKLOOK) | ||
677 | quicktest(gru); | ||
678 | return 0; | ||
679 | } | ||