blob: c5d82a8a2ec9c2498bf9e7ed96823cb14db8afae [file] [log] [blame]
Terje Bergstrom65793242013-03-22 16:34:03 +02001/*
2 * Tegra host1x Command DMA
3 *
4 * Copyright (c) 2010-2013, NVIDIA Corporation.
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms and conditions of the GNU General Public License,
8 * version 2, as published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
13 * more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program. If not, see <http://www.gnu.org/licenses/>.
17 */
18
19
20#include <asm/cacheflush.h>
21#include <linux/device.h>
22#include <linux/dma-mapping.h>
Thierry Reding35d747a2013-09-24 16:30:32 +020023#include <linux/host1x.h>
Terje Bergstrom65793242013-03-22 16:34:03 +020024#include <linux/interrupt.h>
25#include <linux/kernel.h>
26#include <linux/kfifo.h>
27#include <linux/slab.h>
28#include <trace/events/host1x.h>
29
30#include "cdma.h"
31#include "channel.h"
32#include "dev.h"
33#include "debug.h"
Terje Bergstrom65793242013-03-22 16:34:03 +020034#include "job.h"
35
36/*
37 * push_buffer
38 *
39 * The push buffer is a circular array of words to be fetched by command DMA.
40 * Note that it works slightly differently to the sync queue; fence == pos
41 * means that the push buffer is full, not empty.
42 */
43
44#define HOST1X_PUSHBUFFER_SLOTS 512
45
46/*
47 * Clean up push buffer resources
48 */
49static void host1x_pushbuffer_destroy(struct push_buffer *pb)
50{
51 struct host1x_cdma *cdma = pb_to_cdma(pb);
52 struct host1x *host1x = cdma_to_host1x(cdma);
53
54 if (pb->phys != 0)
Luis R. Rodriguezf6e45662016-01-22 18:34:22 -080055 dma_free_wc(host1x->dev, pb->size_bytes + 4, pb->mapped,
56 pb->phys);
Terje Bergstrom65793242013-03-22 16:34:03 +020057
58 pb->mapped = NULL;
59 pb->phys = 0;
60}
61
62/*
63 * Init push buffer resources
64 */
65static int host1x_pushbuffer_init(struct push_buffer *pb)
66{
67 struct host1x_cdma *cdma = pb_to_cdma(pb);
68 struct host1x *host1x = cdma_to_host1x(cdma);
69
70 pb->mapped = NULL;
71 pb->phys = 0;
72 pb->size_bytes = HOST1X_PUSHBUFFER_SLOTS * 8;
73
74 /* initialize buffer pointers */
75 pb->fence = pb->size_bytes - 8;
76 pb->pos = 0;
77
78 /* allocate and map pushbuffer memory */
Luis R. Rodriguezf6e45662016-01-22 18:34:22 -080079 pb->mapped = dma_alloc_wc(host1x->dev, pb->size_bytes + 4, &pb->phys,
80 GFP_KERNEL);
Terje Bergstrom65793242013-03-22 16:34:03 +020081 if (!pb->mapped)
82 goto fail;
83
84 host1x_hw_pushbuffer_init(host1x, pb);
85
86 return 0;
87
88fail:
89 host1x_pushbuffer_destroy(pb);
90 return -ENOMEM;
91}
92
93/*
94 * Push two words to the push buffer
95 * Caller must ensure push buffer is not full
96 */
97static void host1x_pushbuffer_push(struct push_buffer *pb, u32 op1, u32 op2)
98{
Thierry Redingebb24752016-06-23 11:21:51 +020099 u32 *p = (u32 *)((void *)pb->mapped + pb->pos);
100
101 WARN_ON(pb->pos == pb->fence);
Terje Bergstrom65793242013-03-22 16:34:03 +0200102 *(p++) = op1;
103 *(p++) = op2;
Thierry Redingebb24752016-06-23 11:21:51 +0200104 pb->pos = (pb->pos + 8) & (pb->size_bytes - 1);
Terje Bergstrom65793242013-03-22 16:34:03 +0200105}
106
107/*
108 * Pop a number of two word slots from the push buffer
109 * Caller must ensure push buffer is not empty
110 */
111static void host1x_pushbuffer_pop(struct push_buffer *pb, unsigned int slots)
112{
113 /* Advance the next write position */
114 pb->fence = (pb->fence + slots * 8) & (pb->size_bytes - 1);
115}
116
117/*
118 * Return the number of two word slots free in the push buffer
119 */
120static u32 host1x_pushbuffer_space(struct push_buffer *pb)
121{
122 return ((pb->fence - pb->pos) & (pb->size_bytes - 1)) / 8;
123}
124
125/*
126 * Sleep (if necessary) until the requested event happens
127 * - CDMA_EVENT_SYNC_QUEUE_EMPTY : sync queue is completely empty.
128 * - Returns 1
129 * - CDMA_EVENT_PUSH_BUFFER_SPACE : there is space in the push buffer
130 * - Return the amount of space (> 0)
131 * Must be called with the cdma lock held.
132 */
133unsigned int host1x_cdma_wait_locked(struct host1x_cdma *cdma,
134 enum cdma_event event)
135{
136 for (;;) {
Thierry Reding0b8070d12016-06-23 11:35:50 +0200137 struct push_buffer *pb = &cdma->push_buffer;
Terje Bergstrom65793242013-03-22 16:34:03 +0200138 unsigned int space;
139
Thierry Reding0b8070d12016-06-23 11:35:50 +0200140 switch (event) {
141 case CDMA_EVENT_SYNC_QUEUE_EMPTY:
Terje Bergstrom65793242013-03-22 16:34:03 +0200142 space = list_empty(&cdma->sync_queue) ? 1 : 0;
Thierry Reding0b8070d12016-06-23 11:35:50 +0200143 break;
144
145 case CDMA_EVENT_PUSH_BUFFER_SPACE:
Terje Bergstrom65793242013-03-22 16:34:03 +0200146 space = host1x_pushbuffer_space(pb);
Thierry Reding0b8070d12016-06-23 11:35:50 +0200147 break;
148
149 default:
Terje Bergstrom65793242013-03-22 16:34:03 +0200150 WARN_ON(1);
151 return -EINVAL;
152 }
153
154 if (space)
155 return space;
156
157 trace_host1x_wait_cdma(dev_name(cdma_to_channel(cdma)->dev),
158 event);
159
160 /* If somebody has managed to already start waiting, yield */
161 if (cdma->event != CDMA_EVENT_NONE) {
162 mutex_unlock(&cdma->lock);
163 schedule();
164 mutex_lock(&cdma->lock);
165 continue;
166 }
Thierry Reding0b8070d12016-06-23 11:35:50 +0200167
Terje Bergstrom65793242013-03-22 16:34:03 +0200168 cdma->event = event;
169
170 mutex_unlock(&cdma->lock);
171 down(&cdma->sem);
172 mutex_lock(&cdma->lock);
173 }
Thierry Reding0b8070d12016-06-23 11:35:50 +0200174
Terje Bergstrom65793242013-03-22 16:34:03 +0200175 return 0;
176}
177
178/*
179 * Start timer that tracks the time spent by the job.
180 * Must be called with the cdma lock held.
181 */
182static void cdma_start_timer_locked(struct host1x_cdma *cdma,
183 struct host1x_job *job)
184{
185 struct host1x *host = cdma_to_host1x(cdma);
186
187 if (cdma->timeout.client) {
188 /* timer already started */
189 return;
190 }
191
192 cdma->timeout.client = job->client;
193 cdma->timeout.syncpt = host1x_syncpt_get(host, job->syncpt_id);
194 cdma->timeout.syncpt_val = job->syncpt_end;
195 cdma->timeout.start_ktime = ktime_get();
196
197 schedule_delayed_work(&cdma->timeout.wq,
198 msecs_to_jiffies(job->timeout));
199}
200
201/*
202 * Stop timer when a buffer submission completes.
203 * Must be called with the cdma lock held.
204 */
205static void stop_cdma_timer_locked(struct host1x_cdma *cdma)
206{
207 cancel_delayed_work(&cdma->timeout.wq);
208 cdma->timeout.client = 0;
209}
210
211/*
212 * For all sync queue entries that have already finished according to the
213 * current sync point registers:
214 * - unpin & unref their mems
215 * - pop their push buffer slots
216 * - remove them from the sync queue
217 * This is normally called from the host code's worker thread, but can be
218 * called manually if necessary.
219 * Must be called with the cdma lock held.
220 */
221static void update_cdma_locked(struct host1x_cdma *cdma)
222{
223 bool signal = false;
224 struct host1x *host1x = cdma_to_host1x(cdma);
225 struct host1x_job *job, *n;
226
227 /* If CDMA is stopped, queue is cleared and we can return */
228 if (!cdma->running)
229 return;
230
231 /*
232 * Walk the sync queue, reading the sync point registers as necessary,
233 * to consume as many sync queue entries as possible without blocking
234 */
235 list_for_each_entry_safe(job, n, &cdma->sync_queue, list) {
236 struct host1x_syncpt *sp =
237 host1x_syncpt_get(host1x, job->syncpt_id);
238
239 /* Check whether this syncpt has completed, and bail if not */
240 if (!host1x_syncpt_is_expired(sp, job->syncpt_end)) {
241 /* Start timer on next pending syncpt */
242 if (job->timeout)
243 cdma_start_timer_locked(cdma, job);
Thierry Reding0b8070d12016-06-23 11:35:50 +0200244
Terje Bergstrom65793242013-03-22 16:34:03 +0200245 break;
246 }
247
248 /* Cancel timeout, when a buffer completes */
249 if (cdma->timeout.client)
250 stop_cdma_timer_locked(cdma);
251
252 /* Unpin the memory */
253 host1x_job_unpin(job);
254
255 /* Pop push buffer slots */
256 if (job->num_slots) {
257 struct push_buffer *pb = &cdma->push_buffer;
Thierry Reding6df633d2016-06-23 11:33:31 +0200258
Terje Bergstrom65793242013-03-22 16:34:03 +0200259 host1x_pushbuffer_pop(pb, job->num_slots);
Thierry Reding0b8070d12016-06-23 11:35:50 +0200260
Terje Bergstrom65793242013-03-22 16:34:03 +0200261 if (cdma->event == CDMA_EVENT_PUSH_BUFFER_SPACE)
262 signal = true;
263 }
264
265 list_del(&job->list);
266 host1x_job_put(job);
267 }
268
269 if (cdma->event == CDMA_EVENT_SYNC_QUEUE_EMPTY &&
270 list_empty(&cdma->sync_queue))
271 signal = true;
272
273 if (signal) {
274 cdma->event = CDMA_EVENT_NONE;
275 up(&cdma->sem);
276 }
277}
278
279void host1x_cdma_update_sync_queue(struct host1x_cdma *cdma,
280 struct device *dev)
281{
Terje Bergstrom65793242013-03-22 16:34:03 +0200282 struct host1x *host1x = cdma_to_host1x(cdma);
Thierry Reding0b8070d12016-06-23 11:35:50 +0200283 u32 restart_addr, syncpt_incrs, syncpt_val;
284 struct host1x_job *job = NULL;
Terje Bergstrom65793242013-03-22 16:34:03 +0200285
286 syncpt_val = host1x_syncpt_load(cdma->timeout.syncpt);
287
288 dev_dbg(dev, "%s: starting cleanup (thresh %d)\n",
289 __func__, syncpt_val);
290
291 /*
292 * Move the sync_queue read pointer to the first entry that hasn't
293 * completed based on the current HW syncpt value. It's likely there
294 * won't be any (i.e. we're still at the head), but covers the case
295 * where a syncpt incr happens just prior/during the teardown.
296 */
297
298 dev_dbg(dev, "%s: skip completed buffers still in sync_queue\n",
299 __func__);
300
301 list_for_each_entry(job, &cdma->sync_queue, list) {
302 if (syncpt_val < job->syncpt_end)
303 break;
304
305 host1x_job_dump(dev, job);
306 }
307
308 /*
309 * Walk the sync_queue, first incrementing with the CPU syncpts that
310 * are partially executed (the first buffer) or fully skipped while
311 * still in the current context (slots are also NOP-ed).
312 *
313 * At the point contexts are interleaved, syncpt increments must be
314 * done inline with the pushbuffer from a GATHER buffer to maintain
315 * the order (slots are modified to be a GATHER of syncpt incrs).
316 *
317 * Note: save in restart_addr the location where the timed out buffer
318 * started in the PB, so we can start the refetch from there (with the
319 * modified NOP-ed PB slots). This lets things appear to have completed
320 * properly for this buffer and resources are freed.
321 */
322
323 dev_dbg(dev, "%s: perform CPU incr on pending same ctx buffers\n",
324 __func__);
325
326 if (!list_empty(&cdma->sync_queue))
327 restart_addr = job->first_get;
328 else
329 restart_addr = cdma->last_pos;
330
331 /* do CPU increments as long as this context continues */
332 list_for_each_entry_from(job, &cdma->sync_queue, list) {
333 /* different context, gets us out of this loop */
334 if (job->client != cdma->timeout.client)
335 break;
336
337 /* won't need a timeout when replayed */
338 job->timeout = 0;
339
340 syncpt_incrs = job->syncpt_end - syncpt_val;
341 dev_dbg(dev, "%s: CPU incr (%d)\n", __func__, syncpt_incrs);
342
343 host1x_job_dump(dev, job);
344
345 /* safe to use CPU to incr syncpts */
346 host1x_hw_cdma_timeout_cpu_incr(host1x, cdma, job->first_get,
347 syncpt_incrs, job->syncpt_end,
348 job->num_slots);
349
350 syncpt_val += syncpt_incrs;
351 }
352
Thierry Reding6df633d2016-06-23 11:33:31 +0200353 /*
354 * The following sumbits from the same client may be dependent on the
Terje Bergstrom65793242013-03-22 16:34:03 +0200355 * failed submit and therefore they may fail. Force a small timeout
Thierry Reding6df633d2016-06-23 11:33:31 +0200356 * to make the queue cleanup faster.
357 */
Terje Bergstrom65793242013-03-22 16:34:03 +0200358
359 list_for_each_entry_from(job, &cdma->sync_queue, list)
360 if (job->client == cdma->timeout.client)
361 job->timeout = min_t(unsigned int, job->timeout, 500);
362
363 dev_dbg(dev, "%s: finished sync_queue modification\n", __func__);
364
365 /* roll back DMAGET and start up channel again */
366 host1x_hw_cdma_resume(host1x, cdma, restart_addr);
367}
368
369/*
370 * Create a cdma
371 */
372int host1x_cdma_init(struct host1x_cdma *cdma)
373{
374 int err;
375
376 mutex_init(&cdma->lock);
377 sema_init(&cdma->sem, 0);
378
379 INIT_LIST_HEAD(&cdma->sync_queue);
380
381 cdma->event = CDMA_EVENT_NONE;
382 cdma->running = false;
383 cdma->torndown = false;
384
385 err = host1x_pushbuffer_init(&cdma->push_buffer);
386 if (err)
387 return err;
Thierry Reding0b8070d12016-06-23 11:35:50 +0200388
Terje Bergstrom65793242013-03-22 16:34:03 +0200389 return 0;
390}
391
392/*
393 * Destroy a cdma
394 */
395int host1x_cdma_deinit(struct host1x_cdma *cdma)
396{
397 struct push_buffer *pb = &cdma->push_buffer;
398 struct host1x *host1x = cdma_to_host1x(cdma);
399
400 if (cdma->running) {
401 pr_warn("%s: CDMA still running\n", __func__);
402 return -EBUSY;
403 }
404
405 host1x_pushbuffer_destroy(pb);
406 host1x_hw_cdma_timeout_destroy(host1x, cdma);
407
408 return 0;
409}
410
411/*
412 * Begin a cdma submit
413 */
414int host1x_cdma_begin(struct host1x_cdma *cdma, struct host1x_job *job)
415{
416 struct host1x *host1x = cdma_to_host1x(cdma);
417
418 mutex_lock(&cdma->lock);
419
420 if (job->timeout) {
421 /* init state on first submit with timeout value */
422 if (!cdma->timeout.initialized) {
423 int err;
Thierry Reding6df633d2016-06-23 11:33:31 +0200424
Terje Bergstrom65793242013-03-22 16:34:03 +0200425 err = host1x_hw_cdma_timeout_init(host1x, cdma,
426 job->syncpt_id);
427 if (err) {
428 mutex_unlock(&cdma->lock);
429 return err;
430 }
431 }
432 }
Thierry Reding0b8070d12016-06-23 11:35:50 +0200433
Terje Bergstrom65793242013-03-22 16:34:03 +0200434 if (!cdma->running)
435 host1x_hw_cdma_start(host1x, cdma);
436
437 cdma->slots_free = 0;
438 cdma->slots_used = 0;
439 cdma->first_get = cdma->push_buffer.pos;
440
441 trace_host1x_cdma_begin(dev_name(job->channel->dev));
442 return 0;
443}
444
445/*
446 * Push two words into a push buffer slot
447 * Blocks as necessary if the push buffer is full.
448 */
449void host1x_cdma_push(struct host1x_cdma *cdma, u32 op1, u32 op2)
450{
451 struct host1x *host1x = cdma_to_host1x(cdma);
452 struct push_buffer *pb = &cdma->push_buffer;
453 u32 slots_free = cdma->slots_free;
454
Terje Bergstrom62364512013-03-22 16:34:04 +0200455 if (host1x_debug_trace_cmdbuf)
456 trace_host1x_cdma_push(dev_name(cdma_to_channel(cdma)->dev),
457 op1, op2);
458
Terje Bergstrom65793242013-03-22 16:34:03 +0200459 if (slots_free == 0) {
460 host1x_hw_cdma_flush(host1x, cdma);
461 slots_free = host1x_cdma_wait_locked(cdma,
462 CDMA_EVENT_PUSH_BUFFER_SPACE);
463 }
Thierry Reding0b8070d12016-06-23 11:35:50 +0200464
Terje Bergstrom65793242013-03-22 16:34:03 +0200465 cdma->slots_free = slots_free - 1;
466 cdma->slots_used++;
467 host1x_pushbuffer_push(pb, op1, op2);
468}
469
470/*
471 * End a cdma submit
472 * Kick off DMA, add job to the sync queue, and a number of slots to be freed
473 * from the pushbuffer. The handles for a submit must all be pinned at the same
474 * time, but they can be unpinned in smaller chunks.
475 */
476void host1x_cdma_end(struct host1x_cdma *cdma,
477 struct host1x_job *job)
478{
479 struct host1x *host1x = cdma_to_host1x(cdma);
480 bool idle = list_empty(&cdma->sync_queue);
481
482 host1x_hw_cdma_flush(host1x, cdma);
483
484 job->first_get = cdma->first_get;
485 job->num_slots = cdma->slots_used;
486 host1x_job_get(job);
487 list_add_tail(&job->list, &cdma->sync_queue);
488
489 /* start timer on idle -> active transitions */
490 if (job->timeout && idle)
491 cdma_start_timer_locked(cdma, job);
492
493 trace_host1x_cdma_end(dev_name(job->channel->dev));
494 mutex_unlock(&cdma->lock);
495}
496
497/*
498 * Update cdma state according to current sync point values
499 */
500void host1x_cdma_update(struct host1x_cdma *cdma)
501{
502 mutex_lock(&cdma->lock);
503 update_cdma_locked(cdma);
504 mutex_unlock(&cdma->lock);
505}