src/gallium/drivers/svga/svga_resource_buffer.c

   1 /**********************************************************
   2  * Copyright 2008-2009 VMware, Inc.  All rights reserved.
   3  *
   4  * Permission is hereby granted, free of charge, to any person
   5  * obtaining a copy of this software and associated documentation
   6  * files (the "Software"), to deal in the Software without
   7  * restriction, including without limitation the rights to use, copy,
   8  * modify, merge, publish, distribute, sublicense, and/or sell copies
   9  * of the Software, and to permit persons to whom the Software is
  10  * furnished to do so, subject to the following conditions:
  11  *
  12  * The above copyright notice and this permission notice shall be
  13  * included in all copies or substantial portions of the Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  16  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  17  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  18  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  19  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  20  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  21  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  22  * SOFTWARE.
  23  *
  24  **********************************************************/
  25
  26 #include "svga_cmd.h"
  27
  28 #include "pipe/p_state.h"
  29 #include "pipe/p_defines.h"
  30 #include "util/u_inlines.h"
  31 #include "os/os_thread.h"
  32 #include "util/u_math.h"
  33 #include "util/u_memory.h"
  34
  35 #include "svga_context.h"
  36 #include "svga_screen.h"
  37 #include "svga_resource_buffer.h"
  38 #include "svga_resource_buffer_upload.h"
  39 #include "svga_winsys.h"
  40 #include "svga_debug.h"
  41
  42
  43 /**
  44  * Vertex and index buffers need hardware backing.  Constant buffers
  45  * do not.  No other types of buffers currently supported.
  46  */
  47 static INLINE boolean
  48 svga_buffer_needs_hw_storage(unsigned usage)
  49 {
  50    return usage & (PIPE_BIND_VERTEX_BUFFER | PIPE_BIND_INDEX_BUFFER);
  51 }
  52
  53
  54 /**
  55  * Create a buffer transfer.
  56  *
  57  * Unlike texture DMAs (which are written immediately to the command buffer and
  58  * therefore inherently serialized with other context operations), for buffers
  59  * we try to coalesce multiple range mappings (i.e, multiple calls to this
  60  * function) into a single DMA command, for better efficiency in command
  61  * processing.  This means we need to exercise extra care here to ensure that
  62  * the end result is exactly the same as if one DMA was used for every mapped
  63  * range.
  64  */
  65 static struct pipe_transfer *
  66 svga_buffer_get_transfer(struct pipe_context *pipe,
  67                          struct pipe_resource *resource,
  68                          unsigned level,
  69                          unsigned usage,
  70                          const struct pipe_box *box)
  71 {
  72    struct svga_context *svga = svga_context(pipe);
  73    struct svga_screen *ss = svga_screen(pipe->screen);
  74    struct svga_buffer *sbuf = svga_buffer(resource);
  75    struct pipe_transfer *transfer;
  76
  77    transfer = CALLOC_STRUCT(pipe_transfer);
  78    if (transfer == NULL) {
  79       return NULL;
  80    }
  81
  82    transfer->resource = resource;
  83    transfer->level = level;
  84    transfer->usage = usage;
  85    transfer->box = *box;
  86
  87    if (usage & PIPE_TRANSFER_WRITE) {
  88       if (usage & PIPE_TRANSFER_DISCARD_WHOLE_RESOURCE) {
  89          /*
  90           * Finish writing any pending DMA commands, and tell the host to discard
  91           * the buffer contents on the next DMA operation.
  92           */
  93
  94          if (sbuf->dma.pending) {
  95             svga_buffer_upload_flush(svga, sbuf);
  96
  97             /*
  98              * Instead of flushing the context command buffer, simply discard
  99              * the current hwbuf, and start a new one.
 100              */
 101
 102             svga_buffer_destroy_hw_storage(ss, sbuf);
 103          }
 104
 105          sbuf->map.num_ranges = 0;
 106          sbuf->dma.flags.discard = TRUE;
 107       }
 108
 109       if (usage & PIPE_TRANSFER_UNSYNCHRONIZED) {
 110          if (!sbuf->map.num_ranges) {
 111             /*
 112              * No pending ranges to upload so far, so we can tell the host to
 113              * not synchronize on the next DMA command.
 114              */
 115
 116             sbuf->dma.flags.unsynchronized = TRUE;
 117          }
 118       } else {
 119          /*
 120           * Synchronizing, so finish writing any pending DMA command, and
 121           * ensure the next DMA will be done in order.
 122           */
 123
 124          if (sbuf->dma.pending) {
 125             svga_buffer_upload_flush(svga, sbuf);
 126
 127             if (sbuf->hwbuf) {
 128                /*
 129                 * We have a pending DMA upload from a hardware buffer, therefore
 130                 * we need to ensure that the host finishes processing that DMA
 131                 * command before the state tracker can start overwriting the
 132                 * hardware buffer.
 133                 *
 134                 * XXX: This could be avoided by tying the hardware buffer to
 135                 * the transfer (just as done with textures), which would allow
 136                 * overlapping DMAs commands to be queued on the same context
 137                 * buffer. However, due to the likelihood of software vertex
 138                 * processing, it is more convenient to hold on to the hardware
 139                 * buffer, allowing to quickly access the contents from the CPU
 140                 * without having to do a DMA download from the host.
 141                 */
 142
 143                if (usage & PIPE_TRANSFER_DONTBLOCK) {
 144                   /*
 145                    * Flushing the command buffer here will most likely cause
 146                    * the map of the hwbuf below to block, so preemptively
 147                    * return NULL here if DONTBLOCK is set to prevent unnecessary
 148                    * command buffer flushes.
 149                    */
 150
 151                   FREE(transfer);
 152                   return NULL;
 153                }
 154
 155                svga_context_flush(svga, NULL);
 156             }
 157          }
 158
 159          sbuf->dma.flags.unsynchronized = FALSE;
 160       }
 161    }
 162
 163    if (!sbuf->swbuf && !sbuf->hwbuf) {
 164       if (svga_buffer_create_hw_storage(ss, sbuf) != PIPE_OK) {
 165          /*
 166           * We can't create a hardware buffer big enough, so create a malloc
 167           * buffer instead.
 168           */
 169          if (0) {
 170             debug_printf("%s: failed to allocate %u KB of DMA, "
 171                          "splitting DMA transfers\n",
 172                          __FUNCTION__,
 173                          (sbuf->b.b.width0 + 1023)/1024);
 174          }
 175
 176          sbuf->swbuf = align_malloc(sbuf->b.b.width0, 16);
 177          if (!sbuf->swbuf) {
 178             FREE(transfer);
 179             return NULL;
 180          }
 181       }
 182    }
 183
 184    return transfer;
 185 }
 186
 187
 188 /**
 189  * Map a range of a buffer.
 190  */
 191 static void *
 192 svga_buffer_transfer_map( struct pipe_context *pipe,
 193                           struct pipe_transfer *transfer )
 194 {
 195    struct svga_buffer *sbuf = svga_buffer(transfer->resource);
 196
 197    uint8_t *map;
 198
 199    if (sbuf->swbuf) {
 200       /* User/malloc buffer */
 201       map = sbuf->swbuf;
 202    }
 203    else if (sbuf->hwbuf) {
 204       struct svga_screen *ss = svga_screen(pipe->screen);
 205       struct svga_winsys_screen *sws = ss->sws;
 206
 207       map = sws->buffer_map(sws, sbuf->hwbuf, transfer->usage);
 208    }
 209    else {
 210       map = NULL;
 211    }
 212
 213    if (map) {
 214       ++sbuf->map.count;
 215       map += transfer->box.x;
 216    }
 217
 218    return map;
 219 }
 220
 221
 222 static void
 223 svga_buffer_transfer_flush_region( struct pipe_context *pipe,
 224                                    struct pipe_transfer *transfer,
 225                                    const struct pipe_box *box)
 226 {
 227    struct svga_screen *ss = svga_screen(pipe->screen);
 228    struct svga_buffer *sbuf = svga_buffer(transfer->resource);
 229
 230    unsigned offset = transfer->box.x + box->x;
 231    unsigned length = box->width;
 232
 233    assert(transfer->usage & PIPE_TRANSFER_WRITE);
 234    assert(transfer->usage & PIPE_TRANSFER_FLUSH_EXPLICIT);
 235
 236    pipe_mutex_lock(ss->swc_mutex);
 237    svga_buffer_add_range(sbuf, offset, offset + length);
 238    pipe_mutex_unlock(ss->swc_mutex);
 239 }
 240
 241
 242 static void
 243 svga_buffer_transfer_unmap( struct pipe_context *pipe,
 244                             struct pipe_transfer *transfer )
 245 {
 246    struct svga_screen *ss = svga_screen(pipe->screen);
 247    struct svga_winsys_screen *sws = ss->sws;
 248    struct svga_buffer *sbuf = svga_buffer(transfer->resource);
 249
 250    pipe_mutex_lock(ss->swc_mutex);
 251
 252    assert(sbuf->map.count);
 253    if (sbuf->map.count) {
 254       --sbuf->map.count;
 255    }
 256
 257    if (sbuf->hwbuf) {
 258       sws->buffer_unmap(sws, sbuf->hwbuf);
 259    }
 260
 261    if (transfer->usage & PIPE_TRANSFER_WRITE) {
 262       if (!(transfer->usage & PIPE_TRANSFER_FLUSH_EXPLICIT)) {
 263          /*
 264           * Mapped range not flushed explicitly, so flush the whole buffer,
 265           * and tell the host to discard the contents when processing the DMA
 266           * command.
 267           */
 268
 269          SVGA_DBG(DEBUG_DMA, "flushing the whole buffer\n");
 270
 271          sbuf->dma.flags.discard = TRUE;
 272
 273          svga_buffer_add_range(sbuf, 0, sbuf->b.b.width0);
 274       }
 275    }
 276
 277    pipe_mutex_unlock(ss->swc_mutex);
 278 }
 279
 280
 281 /**
 282  * Destroy transfer
 283  */
 284 static void
 285 svga_buffer_transfer_destroy(struct pipe_context *pipe,
 286                              struct pipe_transfer *transfer)
 287 {
 288    FREE(transfer);
 289 }
 290
 291
 292 static void
 293 svga_buffer_destroy( struct pipe_screen *screen,
 294                      struct pipe_resource *buf )
 295 {
 296    struct svga_screen *ss = svga_screen(screen);
 297    struct svga_buffer *sbuf = svga_buffer( buf );
 298
 299    assert(!p_atomic_read(&buf->reference.count));
 300
 301    assert(!sbuf->dma.pending);
 302
 303    if(sbuf->handle)
 304       svga_buffer_destroy_host_surface(ss, sbuf);
 305
 306    if(sbuf->uploaded.buffer)
 307       pipe_resource_reference(&sbuf->uploaded.buffer, NULL);
 308
 309    if(sbuf->hwbuf)
 310       svga_buffer_destroy_hw_storage(ss, sbuf);
 311
 312    if(sbuf->swbuf && !sbuf->user)
 313       align_free(sbuf->swbuf);
 314
 315    FREE(sbuf);
 316 }
 317
 318
 319 struct u_resource_vtbl svga_buffer_vtbl =
 320 {
 321    u_default_resource_get_handle,      /* get_handle */
 322    svga_buffer_destroy,              /* resource_destroy */
 323    svga_buffer_get_transfer,         /* get_transfer */
 324    svga_buffer_transfer_destroy,     /* transfer_destroy */
 325    svga_buffer_transfer_map,         /* transfer_map */
 326    svga_buffer_transfer_flush_region,  /* transfer_flush_region */
 327    svga_buffer_transfer_unmap,       /* transfer_unmap */
 328    u_default_transfer_inline_write   /* transfer_inline_write */
 329 };
 330
 331
 332
 333 struct pipe_resource *
 334 svga_buffer_create(struct pipe_screen *screen,
 335                    const struct pipe_resource *template)
 336 {
 337    struct svga_screen *ss = svga_screen(screen);
 338    struct svga_buffer *sbuf;
 339
 340    sbuf = CALLOC_STRUCT(svga_buffer);
 341    if(!sbuf)
 342       goto error1;
 343
 344    sbuf->b.b = *template;
 345    sbuf->b.vtbl = &svga_buffer_vtbl;
 346    pipe_reference_init(&sbuf->b.b.reference, 1);
 347    sbuf->b.b.screen = screen;
 348
 349    if(svga_buffer_needs_hw_storage(template->bind)) {
 350       if(svga_buffer_create_host_surface(ss, sbuf) != PIPE_OK)
 351          goto error2;
 352    }
 353    else {
 354       sbuf->swbuf = align_malloc(template->width0, 64);
 355       if(!sbuf->swbuf)
 356          goto error2;
 357    }
 358
 359    debug_reference(&sbuf->b.b.reference,
 360                    (debug_reference_descriptor)debug_describe_resource, 0);
 361
 362    return &sbuf->b.b;
 363
 364 error2:
 365    FREE(sbuf);
 366 error1:
 367    return NULL;
 368 }
 369
 370 struct pipe_resource *
 371 svga_user_buffer_create(struct pipe_screen *screen,
 372                         void *ptr,
 373                         unsigned bytes,
 374                         unsigned bind)
 375 {
 376    struct svga_buffer *sbuf;
 377
 378    sbuf = CALLOC_STRUCT(svga_buffer);
 379    if(!sbuf)
 380       goto no_sbuf;
 381
 382    pipe_reference_init(&sbuf->b.b.reference, 1);
 383    sbuf->b.vtbl = &svga_buffer_vtbl;
 384    sbuf->b.b.screen = screen;
 385    sbuf->b.b.format = PIPE_FORMAT_R8_UNORM; /* ?? */
 386    sbuf->b.b.usage = PIPE_USAGE_IMMUTABLE;
 387    sbuf->b.b.bind = bind;
 388    sbuf->b.b.width0 = bytes;
 389    sbuf->b.b.height0 = 1;
 390    sbuf->b.b.depth0 = 1;
 391    sbuf->b.b.array_size = 1;
 392
 393    sbuf->swbuf = ptr;
 394    sbuf->user = TRUE;
 395
 396    debug_reference(&sbuf->b.b.reference,
 397                    (debug_reference_descriptor)debug_describe_resource, 0);
 398
 399    return &sbuf->b.b;
 400
 401 no_sbuf:
 402    return NULL;
 403 }
 404
 405
 406