src/mesa/drivers/dri/intel/intel_regions.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2006 Tungsten Graphics, Inc., Cedar Park, Texas.
   4  * All Rights Reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the
   8  * "Software"), to deal in the Software without restriction, including
   9  * without limitation the rights to use, copy, modify, merge, publish,
  10  * distribute, sub license, and/or sell copies of the Software, and to
  11  * permit persons to whom the Software is furnished to do so, subject to
  12  * the following conditions:
  13  *
  14  * The above copyright notice and this permission notice (including the
  15  * next paragraph) shall be included in all copies or substantial portions
  16  * of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  19  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  21  * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
  22  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  23  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  24  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  **************************************************************************/
  27
  28 /* Provide additional functionality on top of bufmgr buffers:
  29  *   - 2d semantics and blit operations
  30  *   - refcounting of buffers for multiple images in a buffer.
  31  *   - refcounting of buffer mappings.
  32  *   - some logic for moving the buffers to the best memory pools for
  33  *     given operations.
  34  *
  35  * Most of this is to make it easier to implement the fixed-layout
  36  * mipmap tree required by intel hardware in the face of GL's
  37  * programming interface where each image can be specifed in random
  38  * order and it isn't clear what layout the tree should have until the
  39  * last moment.
  40  */
  41
  42 #include <sys/ioctl.h>
  43 #include <errno.h>
  44
  45 #include "main/hash.h"
  46 #include "intel_context.h"
  47 #include "intel_regions.h"
  48 #include "intel_blit.h"
  49 #include "intel_buffer_objects.h"
  50 #include "intel_bufmgr.h"
  51 #include "intel_batchbuffer.h"
  52
  53 #define FILE_DEBUG_FLAG DEBUG_REGION
  54
  55 /* This should be set to the maximum backtrace size desired.
  56  * Set it to 0 to disable backtrace debugging.
  57  */
  58 #define DEBUG_BACKTRACE_SIZE 0
  59
  60 #if DEBUG_BACKTRACE_SIZE == 0
  61 /* Use the standard debug output */
  62 #define _DBG(...) DBG(__VA_ARGS__)
  63 #else
  64 /* Use backtracing debug output */
  65 #define _DBG(...) {debug_backtrace(); DBG(__VA_ARGS__);}
  66
  67 /* Backtracing debug support */
  68 #include <execinfo.h>
  69
  70 static void
  71 debug_backtrace(void)
  72 {
  73    void *trace[DEBUG_BACKTRACE_SIZE];
  74    char **strings = NULL;
  75    int traceSize;
  76    register int i;
  77
  78    traceSize = backtrace(trace, DEBUG_BACKTRACE_SIZE);
  79    strings = backtrace_symbols(trace, traceSize);
  80    if (strings == NULL) {
  81       DBG("no backtrace:");
  82       return;
  83    }
  84
  85    /* Spit out all the strings with a colon separator.  Ignore
  86     * the first, since we don't really care about the call
  87     * to debug_backtrace() itself.  Skip until the final "/" in
  88     * the trace to avoid really long lines.
  89     */
  90    for (i = 1; i < traceSize; i++) {
  91       char *p = strings[i], *slash = strings[i];
  92       while (*p) {
  93          if (*p++ == '/') {
  94             slash = p;
  95          }
  96       }
  97
  98       DBG("%s:", slash);
  99    }
 100
 101    /* Free up the memory, and we're done */
 102    free(strings);
 103 }
 104
 105 #endif
 106
 107
 108
 109 /* XXX: Thread safety?
 110  */
 111 GLubyte *
 112 intel_region_map(struct intel_context *intel, struct intel_region *region,
 113                  GLbitfield mode)
 114 {
 115    /* We have the region->map_refcount controlling mapping of the BO because
 116     * in software fallbacks we may end up mapping the same buffer multiple
 117     * times on Mesa's behalf, so we refcount our mappings to make sure that
 118     * the pointer stays valid until the end of the unmap chain.  However, we
 119     * must not emit any batchbuffers between the start of mapping and the end
 120     * of unmapping, or further use of the map will be incoherent with the GPU
 121     * rendering done by that batchbuffer. Hence we assert in
 122     * intel_batchbuffer_flush() that that doesn't happen, which means that the
 123     * flush is only needed on first map of the buffer.
 124     */
 125
 126    _DBG("%s %p\n", __FUNCTION__, region);
 127    if (!region->map_refcount++) {
 128       intel_flush(&intel->ctx);
 129
 130       if (region->tiling != I915_TILING_NONE)
 131          drm_intel_gem_bo_map_gtt(region->bo);
 132       else
 133          drm_intel_bo_map(region->bo, true);
 134
 135       region->map = region->bo->virtual;
 136       ++intel->num_mapped_regions;
 137    }
 138
 139    return region->map;
 140 }
 141
 142 void
 143 intel_region_unmap(struct intel_context *intel, struct intel_region *region)
 144 {
 145    _DBG("%s %p\n", __FUNCTION__, region);
 146    if (!--region->map_refcount) {
 147       if (region->tiling != I915_TILING_NONE)
 148          drm_intel_gem_bo_unmap_gtt(region->bo);
 149       else
 150          drm_intel_bo_unmap(region->bo);
 151
 152       region->map = NULL;
 153       --intel->num_mapped_regions;
 154       assert(intel->num_mapped_regions >= 0);
 155    }
 156 }
 157
 158 static struct intel_region *
 159 intel_region_alloc_internal(struct intel_screen *screen,
 160                             GLuint cpp,
 161                             GLuint width, GLuint height, GLuint pitch,
 162                             uint32_t tiling, drm_intel_bo *buffer)
 163 {
 164    struct intel_region *region;
 165
 166    region = calloc(sizeof(*region), 1);
 167    if (region == NULL)
 168       return region;
 169
 170    region->cpp = cpp;
 171    region->width = width;
 172    region->height = height;
 173    region->pitch = pitch;
 174    region->refcount = 1;
 175    region->bo = buffer;
 176    region->tiling = tiling;
 177    region->screen = screen;
 178
 179    _DBG("%s <-- %p\n", __FUNCTION__, region);
 180    return region;
 181 }
 182
 183 struct intel_region *
 184 intel_region_alloc(struct intel_screen *screen,
 185                    uint32_t tiling,
 186                    GLuint cpp, GLuint width, GLuint height,
 187                    bool expect_accelerated_upload)
 188 {
 189    drm_intel_bo *buffer;
 190    unsigned long flags = 0;
 191    unsigned long aligned_pitch;
 192    struct intel_region *region;
 193
 194    if (expect_accelerated_upload)
 195       flags |= BO_ALLOC_FOR_RENDER;
 196
 197    buffer = drm_intel_bo_alloc_tiled(screen->bufmgr, "region",
 198                                      width, height, cpp,
 199                                      &tiling, &aligned_pitch, flags);
 200    if (buffer == NULL)
 201       return NULL;
 202
 203    region = intel_region_alloc_internal(screen, cpp, width, height,
 204                                         aligned_pitch / cpp, tiling, buffer);
 205    if (region == NULL) {
 206       drm_intel_bo_unreference(buffer);
 207       return NULL;
 208    }
 209
 210    return region;
 211 }
 212
 213 bool
 214 intel_region_flink(struct intel_region *region, uint32_t *name)
 215 {
 216    if (region->name == 0) {
 217       if (drm_intel_bo_flink(region->bo, &region->name))
 218          return false;
 219
 220       _mesa_HashInsert(region->screen->named_regions,
 221                        region->name, region);
 222    }
 223
 224    *name = region->name;
 225
 226    return true;
 227 }
 228
 229 struct intel_region *
 230 intel_region_alloc_for_handle(struct intel_screen *screen,
 231                               GLuint cpp,
 232                               GLuint width, GLuint height, GLuint pitch,
 233                               GLuint handle, const char *name)
 234 {
 235    struct intel_region *region, *dummy;
 236    drm_intel_bo *buffer;
 237    int ret;
 238    uint32_t bit_6_swizzle, tiling;
 239
 240    region = _mesa_HashLookup(screen->named_regions, handle);
 241    if (region != NULL) {
 242       dummy = NULL;
 243       if (region->width != width || region->height != height ||
 244           region->cpp != cpp || region->pitch != pitch) {
 245          fprintf(stderr,
 246                  "Region for name %d already exists but is not compatible\n",
 247                  handle);
 248          return NULL;
 249       }
 250       intel_region_reference(&dummy, region);
 251       return dummy;
 252    }
 253
 254    buffer = intel_bo_gem_create_from_name(screen->bufmgr, name, handle);
 255    if (buffer == NULL)
 256       return NULL;
 257    ret = drm_intel_bo_get_tiling(buffer, &tiling, &bit_6_swizzle);
 258    if (ret != 0) {
 259       fprintf(stderr, "Couldn't get tiling of buffer %d (%s): %s\n",
 260               handle, name, strerror(-ret));
 261       drm_intel_bo_unreference(buffer);
 262       return NULL;
 263    }
 264
 265    region = intel_region_alloc_internal(screen, cpp,
 266                                         width, height, pitch, tiling, buffer);
 267    if (region == NULL) {
 268       drm_intel_bo_unreference(buffer);
 269       return NULL;
 270    }
 271
 272    region->name = handle;
 273    _mesa_HashInsert(screen->named_regions, handle, region);
 274
 275    return region;
 276 }
 277
 278 void
 279 intel_region_reference(struct intel_region **dst, struct intel_region *src)
 280 {
 281    _DBG("%s: %p(%d) -> %p(%d)\n", __FUNCTION__,
 282         *dst, *dst ? (*dst)->refcount : 0, src, src ? src->refcount : 0);
 283
 284    if (src != *dst) {
 285       if (*dst)
 286          intel_region_release(dst);
 287
 288       if (src)
 289          src->refcount++;
 290       *dst = src;
 291    }
 292 }
 293
 294 void
 295 intel_region_release(struct intel_region **region_handle)
 296 {
 297    struct intel_region *region = *region_handle;
 298
 299    if (region == NULL) {
 300       _DBG("%s NULL\n", __FUNCTION__);
 301       return;
 302    }
 303
 304    _DBG("%s %p %d\n", __FUNCTION__, region, region->refcount - 1);
 305
 306    ASSERT(region->refcount > 0);
 307    region->refcount--;
 308
 309    if (region->refcount == 0) {
 310       assert(region->map_refcount == 0);
 311
 312       drm_intel_bo_unreference(region->bo);
 313
 314       if (region->name > 0)
 315          _mesa_HashRemove(region->screen->named_regions, region->name);
 316
 317       free(region);
 318    }
 319    *region_handle = NULL;
 320 }
 321
 322 /*
 323  * XXX Move this into core Mesa?
 324  */
 325 void
 326 _mesa_copy_rect(GLubyte * dst,
 327                 GLuint cpp,
 328                 GLuint dst_pitch,
 329                 GLuint dst_x,
 330                 GLuint dst_y,
 331                 GLuint width,
 332                 GLuint height,
 333                 const GLubyte * src,
 334                 GLuint src_pitch, GLuint src_x, GLuint src_y)
 335 {
 336    GLuint i;
 337
 338    dst_pitch *= cpp;
 339    src_pitch *= cpp;
 340    dst += dst_x * cpp;
 341    src += src_x * cpp;
 342    dst += dst_y * dst_pitch;
 343    src += src_y * src_pitch;
 344    width *= cpp;
 345
 346    if (width == dst_pitch && width == src_pitch)
 347       memcpy(dst, src, height * width);
 348    else {
 349       for (i = 0; i < height; i++) {
 350          memcpy(dst, src, width);
 351          dst += dst_pitch;
 352          src += src_pitch;
 353       }
 354    }
 355 }
 356
 357 /* Copy rectangular sub-regions. Need better logic about when to
 358  * push buffers into AGP - will currently do so whenever possible.
 359  */
 360 bool
 361 intel_region_copy(struct intel_context *intel,
 362                   struct intel_region *dst,
 363                   GLuint dst_offset,
 364                   GLuint dstx, GLuint dsty,
 365                   struct intel_region *src,
 366                   GLuint src_offset,
 367                   GLuint srcx, GLuint srcy, GLuint width, GLuint height,
 368                   bool flip,
 369                   GLenum logicop)
 370 {
 371    uint32_t src_pitch = src->pitch;
 372
 373    _DBG("%s\n", __FUNCTION__);
 374
 375    if (intel == NULL)
 376       return false;
 377
 378    assert(src->cpp == dst->cpp);
 379
 380    if (flip)
 381       src_pitch = -src_pitch;
 382
 383    return intelEmitCopyBlit(intel,
 384                             dst->cpp,
 385                             src_pitch, src->bo, src_offset, src->tiling,
 386                             dst->pitch, dst->bo, dst_offset, dst->tiling,
 387                             srcx, srcy, dstx, dsty, width, height,
 388                             logicop);
 389 }