summaryrefslogtreecommitdiffstats
path: root/src/gallium/drivers/svga/svga_resource_buffer.c
blob: a92a5c1190437bf5808b6481f77d79ea01a2e834 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
/**********************************************************
 * Copyright 2008-2009 VMware, Inc.  All rights reserved.
 *
 * Permission is hereby granted, free of charge, to any person
 * obtaining a copy of this software and associated documentation
 * files (the "Software"), to deal in the Software without
 * restriction, including without limitation the rights to use, copy,
 * modify, merge, publish, distribute, sublicense, and/or sell copies
 * of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 *
 **********************************************************/

#include "svga_cmd.h"

#include "pipe/p_state.h"
#include "pipe/p_defines.h"
#include "util/u_inlines.h"
#include "os/os_thread.h"
#include "os/os_time.h"
#include "util/u_math.h"
#include "util/u_memory.h"
#include "util/u_resource.h"

#include "svga_context.h"
#include "svga_screen.h"
#include "svga_resource_buffer.h"
#include "svga_resource_buffer_upload.h"
#include "svga_winsys.h"
#include "svga_debug.h"


/**
 * Vertex and index buffers need hardware backing.  Constant buffers
 * do not.  No other types of buffers currently supported.
 */
static inline boolean
svga_buffer_needs_hw_storage(unsigned usage)
{
   return (usage & (PIPE_BIND_VERTEX_BUFFER | PIPE_BIND_INDEX_BUFFER |
                    PIPE_BIND_SAMPLER_VIEW | PIPE_BIND_STREAM_OUTPUT)) != 0;
}


/**
 * Create a buffer transfer.
 *
 * Unlike texture DMAs (which are written immediately to the command buffer and
 * therefore inherently serialized with other context operations), for buffers
 * we try to coalesce multiple range mappings (i.e, multiple calls to this
 * function) into a single DMA command, for better efficiency in command
 * processing.  This means we need to exercise extra care here to ensure that
 * the end result is exactly the same as if one DMA was used for every mapped
 * range.
 */
static void *
svga_buffer_transfer_map(struct pipe_context *pipe,
                         struct pipe_resource *resource,
                         unsigned level,
                         unsigned usage,
                         const struct pipe_box *box,
                         struct pipe_transfer **ptransfer)
{
   struct svga_context *svga = svga_context(pipe);
   struct svga_screen *ss = svga_screen(pipe->screen);
   struct svga_buffer *sbuf = svga_buffer(resource);
   struct pipe_transfer *transfer;
   uint8_t *map;
   int64_t begin = os_time_get();

   assert(box->y == 0);
   assert(box->z == 0);
   assert(box->height == 1);
   assert(box->depth == 1);

   transfer = CALLOC_STRUCT(pipe_transfer);
   if (!transfer) {
      return NULL;
   }

   transfer->resource = resource;
   transfer->level = level;
   transfer->usage = usage;
   transfer->box = *box;

   if ((usage & PIPE_TRANSFER_READ) && sbuf->dirty) {
      enum pipe_error ret;

      /* Host-side buffers can only be dirtied with vgpu10 features
       * (streamout and buffer copy).
       */
      assert(svga_have_vgpu10(svga));

      if (!sbuf->user) {
         (void) svga_buffer_handle(svga, resource);
      }

      if (sbuf->dma.pending > 0) {
         svga_buffer_upload_flush(svga, sbuf);
         svga_context_finish(svga);
      }

      assert(sbuf->handle);

      ret = SVGA3D_vgpu10_ReadbackSubResource(svga->swc, sbuf->handle, 0);
      if (ret != PIPE_OK) {
         svga_context_flush(svga, NULL);
         ret = SVGA3D_vgpu10_ReadbackSubResource(svga->swc, sbuf->handle, 0);
         assert(ret == PIPE_OK);
      }

      svga->hud.num_readbacks++;

      svga_context_finish(svga);

      sbuf->dirty = FALSE;
   }

   if (usage & PIPE_TRANSFER_WRITE) {
      if (usage & PIPE_TRANSFER_DISCARD_WHOLE_RESOURCE) {
         /*
          * Flush any pending primitives, finish writing any pending DMA
          * commands, and tell the host to discard the buffer contents on
          * the next DMA operation.
          */

         svga_hwtnl_flush_buffer(svga, resource);

         if (sbuf->dma.pending) {
            svga_buffer_upload_flush(svga, sbuf);

            /*
             * Instead of flushing the context command buffer, simply discard
             * the current hwbuf, and start a new one.
             * With GB objects, the map operation takes care of this
             * if passed the PIPE_TRANSFER_DISCARD_WHOLE_RESOURCE flag,
             * and the old backing store is busy.
             */

            if (!svga_have_gb_objects(svga))
               svga_buffer_destroy_hw_storage(ss, sbuf);
         }

         sbuf->map.num_ranges = 0;
         sbuf->dma.flags.discard = TRUE;
      }

      if (usage & PIPE_TRANSFER_UNSYNCHRONIZED) {
         if (!sbuf->map.num_ranges) {
            /*
             * No pending ranges to upload so far, so we can tell the host to
             * not synchronize on the next DMA command.
             */

            sbuf->dma.flags.unsynchronized = TRUE;
         }
      } else {
         /*
          * Synchronizing, so flush any pending primitives, finish writing any
          * pending DMA command, and ensure the next DMA will be done in order.
          */

         svga_hwtnl_flush_buffer(svga, resource);

         if (sbuf->dma.pending) {
            svga_buffer_upload_flush(svga, sbuf);

            if (svga_buffer_has_hw_storage(sbuf)) {
               /*
                * We have a pending DMA upload from a hardware buffer, therefore
                * we need to ensure that the host finishes processing that DMA
                * command before the state tracker can start overwriting the
                * hardware buffer.
                *
                * XXX: This could be avoided by tying the hardware buffer to
                * the transfer (just as done with textures), which would allow
                * overlapping DMAs commands to be queued on the same context
                * buffer. However, due to the likelihood of software vertex
                * processing, it is more convenient to hold on to the hardware
                * buffer, allowing to quickly access the contents from the CPU
                * without having to do a DMA download from the host.
                */

               if (usage & PIPE_TRANSFER_DONTBLOCK) {
                  /*
                   * Flushing the command buffer here will most likely cause
                   * the map of the hwbuf below to block, so preemptively
                   * return NULL here if DONTBLOCK is set to prevent unnecessary
                   * command buffer flushes.
                   */

                  FREE(transfer);
                  return NULL;
               }

               svga_context_flush(svga, NULL);
            }
         }

         sbuf->dma.flags.unsynchronized = FALSE;
      }
   }

   if (!sbuf->swbuf && !svga_buffer_has_hw_storage(sbuf)) {
      if (svga_buffer_create_hw_storage(ss, sbuf) != PIPE_OK) {
         /*
          * We can't create a hardware buffer big enough, so create a malloc
          * buffer instead.
          */
         if (0) {
            debug_printf("%s: failed to allocate %u KB of DMA, "
                         "splitting DMA transfers\n",
                         __FUNCTION__,
                         (sbuf->b.b.width0 + 1023)/1024);
         }

         sbuf->swbuf = align_malloc(sbuf->b.b.width0, 16);
         if (!sbuf->swbuf) {
            FREE(transfer);
            return NULL;
         }
      }
   }

   if (sbuf->swbuf) {
      /* User/malloc buffer */
      map = sbuf->swbuf;
   }
   else if (svga_buffer_has_hw_storage(sbuf)) {
      boolean retry;

      map = svga_buffer_hw_storage_map(svga, sbuf, transfer->usage, &retry);
      if (map == NULL && retry) {
         /*
          * At this point, svga_buffer_get_transfer() has already
          * hit the DISCARD_WHOLE_RESOURCE path and flushed HWTNL
          * for this buffer.
          */
         svga_context_flush(svga, NULL);
         map = svga_buffer_hw_storage_map(svga, sbuf, transfer->usage, &retry);
      }
   }
   else {
      map = NULL;
   }

   if (map) {
      ++sbuf->map.count;
      map += transfer->box.x;
      *ptransfer = transfer;
   } else {
      FREE(transfer);
   }

   svga->hud.map_buffer_time += (os_time_get() - begin);

   return map;
}


static void
svga_buffer_transfer_flush_region( struct pipe_context *pipe,
                                   struct pipe_transfer *transfer,
                                   const struct pipe_box *box)
{
   struct svga_screen *ss = svga_screen(pipe->screen);
   struct svga_buffer *sbuf = svga_buffer(transfer->resource);

   unsigned offset = transfer->box.x + box->x;
   unsigned length = box->width;

   assert(transfer->usage & PIPE_TRANSFER_WRITE);
   assert(transfer->usage & PIPE_TRANSFER_FLUSH_EXPLICIT);

   pipe_mutex_lock(ss->swc_mutex);
   svga_buffer_add_range(sbuf, offset, offset + length);
   pipe_mutex_unlock(ss->swc_mutex);
}


static void
svga_buffer_transfer_unmap( struct pipe_context *pipe,
                            struct pipe_transfer *transfer )
{
   struct svga_screen *ss = svga_screen(pipe->screen);
   struct svga_context *svga = svga_context(pipe);
   struct svga_buffer *sbuf = svga_buffer(transfer->resource);

   pipe_mutex_lock(ss->swc_mutex);

   assert(sbuf->map.count);
   if (sbuf->map.count) {
      --sbuf->map.count;
   }

   if (svga_buffer_has_hw_storage(sbuf)) {
      svga_buffer_hw_storage_unmap(svga, sbuf);
   }

   if (transfer->usage & PIPE_TRANSFER_WRITE) {
      if (!(transfer->usage & PIPE_TRANSFER_FLUSH_EXPLICIT)) {
         /*
          * Mapped range not flushed explicitly, so flush the whole buffer,
          * and tell the host to discard the contents when processing the DMA
          * command.
          */

         SVGA_DBG(DEBUG_DMA, "flushing the whole buffer\n");

         sbuf->dma.flags.discard = TRUE;

         svga_buffer_add_range(sbuf, 0, sbuf->b.b.width0);
      }
   }

   pipe_mutex_unlock(ss->swc_mutex);
   FREE(transfer);
}


static void
svga_buffer_destroy( struct pipe_screen *screen,
		     struct pipe_resource *buf )
{
   struct svga_screen *ss = svga_screen(screen); 
   struct svga_buffer *sbuf = svga_buffer( buf );

   assert(!p_atomic_read(&buf->reference.count));

   assert(!sbuf->dma.pending);

   if (sbuf->handle)
      svga_buffer_destroy_host_surface(ss, sbuf);

   if (sbuf->uploaded.buffer)
      pipe_resource_reference(&sbuf->uploaded.buffer, NULL);

   if (sbuf->hwbuf)
      svga_buffer_destroy_hw_storage(ss, sbuf);

   if (sbuf->swbuf && !sbuf->user)
      align_free(sbuf->swbuf);

   ss->hud.total_resource_bytes -= sbuf->size;
   assert(ss->hud.num_resources > 0);
   if (ss->hud.num_resources > 0)
      ss->hud.num_resources--;

   FREE(sbuf);
}


struct u_resource_vtbl svga_buffer_vtbl =
{
   u_default_resource_get_handle,      /* get_handle */
   svga_buffer_destroy,		     /* resource_destroy */
   svga_buffer_transfer_map,	     /* transfer_map */
   svga_buffer_transfer_flush_region,  /* transfer_flush_region */
   svga_buffer_transfer_unmap,	     /* transfer_unmap */
   u_default_transfer_inline_write   /* transfer_inline_write */
};



struct pipe_resource *
svga_buffer_create(struct pipe_screen *screen,
		   const struct pipe_resource *template)
{
   struct svga_screen *ss = svga_screen(screen);
   struct svga_buffer *sbuf;

   sbuf = CALLOC_STRUCT(svga_buffer);
   if (!sbuf)
      goto error1;

   sbuf->b.b = *template;
   sbuf->b.vtbl = &svga_buffer_vtbl;
   pipe_reference_init(&sbuf->b.b.reference, 1);
   sbuf->b.b.screen = screen;
   sbuf->bind_flags = template->bind;

   if (template->bind & PIPE_BIND_CONSTANT_BUFFER) {
      /* Constant buffers can only have the PIPE_BIND_CONSTANT_BUFFER
       * flag set.
       */
      if (ss->sws->have_vgpu10) {
         sbuf->bind_flags = PIPE_BIND_CONSTANT_BUFFER;

         /* Constant buffer size needs to be in multiples of 16. */
         sbuf->b.b.width0 = align(sbuf->b.b.width0, 16);
      }
   }

   if (svga_buffer_needs_hw_storage(template->bind)) {

      /* If the buffer will be used for vertex/index/stream data, set all
       * the flags so that the buffer will be accepted for all those uses.
       * Note that the PIPE_BIND_ flags we get from the state tracker are
       * just a hint about how the buffer may be used.  And OpenGL buffer
       * object may be used for many different things.
       */
      if (!(template->bind & PIPE_BIND_CONSTANT_BUFFER)) {
         /* Not a constant buffer.  The buffer may be used for vertex data,
          * indexes or stream-out.
          */
         sbuf->bind_flags |= (PIPE_BIND_VERTEX_BUFFER |
                              PIPE_BIND_INDEX_BUFFER);
         if (ss->sws->have_vgpu10)
            sbuf->bind_flags |= PIPE_BIND_STREAM_OUTPUT;
      }

      if (svga_buffer_create_host_surface(ss, sbuf) != PIPE_OK)
         goto error2;
   }
   else {
      sbuf->swbuf = align_malloc(sbuf->b.b.width0, 64);
      if (!sbuf->swbuf)
         goto error2;
   }

   debug_reference(&sbuf->b.b.reference,
                   (debug_reference_descriptor)debug_describe_resource, 0);

   sbuf->size = util_resource_size(&sbuf->b.b);
   ss->hud.total_resource_bytes += sbuf->size;

   ss->hud.num_resources++;

   return &sbuf->b.b;

error2:
   FREE(sbuf);
error1:
   return NULL;
}


struct pipe_resource *
svga_user_buffer_create(struct pipe_screen *screen,
                        void *ptr,
                        unsigned bytes,
			unsigned bind)
{
   struct svga_buffer *sbuf;
   struct svga_screen *ss = svga_screen(screen);

   sbuf = CALLOC_STRUCT(svga_buffer);
   if (!sbuf)
      goto no_sbuf;

   pipe_reference_init(&sbuf->b.b.reference, 1);
   sbuf->b.vtbl = &svga_buffer_vtbl;
   sbuf->b.b.screen = screen;
   sbuf->b.b.format = PIPE_FORMAT_R8_UNORM; /* ?? */
   sbuf->b.b.usage = PIPE_USAGE_IMMUTABLE;
   sbuf->b.b.bind = bind;
   sbuf->b.b.width0 = bytes;
   sbuf->b.b.height0 = 1;
   sbuf->b.b.depth0 = 1;
   sbuf->b.b.array_size = 1;

   sbuf->bind_flags = bind;
   sbuf->swbuf = ptr;
   sbuf->user = TRUE;

   debug_reference(&sbuf->b.b.reference,
                   (debug_reference_descriptor)debug_describe_resource, 0);

   ss->hud.num_resources++;

   return &sbuf->b.b;

no_sbuf:
   return NULL;
}