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/**************************************************************************

 *

 * Copyright 2006 Tungsten Graphics, Inc., Cedar Park, Texas.

 * 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, sub license, 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 (including the

 * next paragraph) 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 NON-INFRINGEMENT.

 * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS 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.

 *

 **************************************************************************/

/* Provide additional functionality on top of bufmgr buffers:

 *   - 2d semantics and blit operations

 *   - refcounting of buffers for multiple images in a buffer.

 *   - refcounting of buffer mappings.

 *   - some logic for moving the buffers to the best memory pools for

 *     given operations.

 *

 * Most of this is to make it easier to implement the fixed-layout

 * mipmap tree required by intel hardware in the face of GL's

 * programming interface where each image can be specifed in random

 * order and it isn't clear what layout the tree should have until the

 * last moment.

 */

#include 

#include 

#include "main/hash.h"

#include "intel_context.h"

#include "intel_regions.h"

#include "intel_blit.h"

#include "intel_buffer_objects.h"

#include "intel_bufmgr.h"

#include "intel_batchbuffer.h"

#define FILE_DEBUG_FLAG DEBUG_REGION

/* This should be set to the maximum backtrace size desired.

 * Set it to 0 to disable backtrace debugging.

 */

#define DEBUG_BACKTRACE_SIZE 0

#if DEBUG_BACKTRACE_SIZE == 0

/* Use the standard debug output */

#define _DBG(...) DBG(__VA_ARGS__)

#else

/* Use backtracing debug output */

#define _DBG(...) {debug_backtrace(); DBG(__VA_ARGS__);}

/* Backtracing debug support */

#include 

static void

debug_backtrace(void)

{

   void *trace[DEBUG_BACKTRACE_SIZE];

   char **strings = NULL;

   int traceSize;

   register int i;

   traceSize = backtrace(trace, DEBUG_BACKTRACE_SIZE);

   strings = backtrace_symbols(trace, traceSize);

   if (strings == NULL) {

      DBG("no backtrace:");

      return;

   }

   /* Spit out all the strings with a colon separator.  Ignore

    * the first, since we don't really care about the call

    * to debug_backtrace() itself.  Skip until the final "/" in

    * the trace to avoid really long lines.

    */

   for (i = 1; i < traceSize; i++) {

      char *p = strings[i], *slash = strings[i];

      while (*p) {

         if (*p++ == '/') {

            slash = p;

         }

      }

      DBG("%s:", slash);

   }

   /* Free up the memory, and we're done */

   free(strings);

}

#endif

static struct intel_region *

intel_region_alloc_internal(struct intel_screen *screen,

			    GLuint cpp,

			    GLuint width, GLuint height, GLuint pitch,

			    uint32_t tiling, drm_intel_bo *buffer)

{

   struct intel_region *region;

   region = calloc(sizeof(*region), 1);

   if (region == NULL)

      return region;

   region->cpp = cpp;

   region->width = width;

   region->height = height;

   region->pitch = pitch;

   region->refcount = 1;

   region->bo = buffer;

   region->tiling = tiling;

   _DBG("%s <-- %p\n", __FUNCTION__, region);

   return region;

}

struct intel_region *

intel_region_alloc(struct intel_screen *screen,

		   uint32_t tiling,

                   GLuint cpp, GLuint width, GLuint height,

		   bool expect_accelerated_upload)

{

   drm_intel_bo *buffer;

   unsigned long flags = 0;

   unsigned long aligned_pitch;

   struct intel_region *region;

   if (expect_accelerated_upload)

      flags |= BO_ALLOC_FOR_RENDER;

   buffer = drm_intel_bo_alloc_tiled(screen->bufmgr, "region",

				     width, height, cpp,

				     &tiling, &aligned_pitch, flags);

   if (buffer == NULL)

      return NULL;

   region = intel_region_alloc_internal(screen, cpp, width, height,

                                        aligned_pitch, tiling, buffer);

   if (region == NULL) {

      drm_intel_bo_unreference(buffer);

      return NULL;

   }

   return region;

}

bool

intel_region_flink(struct intel_region *region, uint32_t *name)

{

   if (region->name == 0) {

      if (drm_intel_bo_flink(region->bo, ®ion->name))

	 return false;

   }

   *name = region->name;

   return true;

}

struct intel_region *

intel_region_alloc_for_handle(struct intel_screen *screen,

			      GLuint cpp,

			      GLuint width, GLuint height, GLuint pitch,

			      GLuint handle, const char *name)

{

   struct intel_region *region;

   drm_intel_bo *buffer;

   int ret;

   uint32_t bit_6_swizzle, tiling;

   buffer = intel_bo_gem_create_from_name(screen->bufmgr, name, handle);

   if (buffer == NULL)

      return NULL;

   ret = drm_intel_bo_get_tiling(buffer, &tiling, &bit_6_swizzle);

   if (ret != 0) {

      fprintf(stderr, "Couldn't get tiling of buffer %d (%s): %s\n",

	      handle, name, strerror(-ret));

      drm_intel_bo_unreference(buffer);

      return NULL;

   }

   region = intel_region_alloc_internal(screen, cpp,

					width, height, pitch, tiling, buffer);

   if (region == NULL) {

      drm_intel_bo_unreference(buffer);

      return NULL;

   }

   region->name = handle;

   return region;

}

struct intel_region *

intel_region_alloc_for_fd(struct intel_screen *screen,

                          GLuint cpp,

                          GLuint width, GLuint height, GLuint pitch,

                          int fd, const char *name)

{

   struct intel_region *region;

   drm_intel_bo *buffer;

   int ret;

   uint32_t bit_6_swizzle, tiling;

   buffer = drm_intel_bo_gem_create_from_prime(screen->bufmgr,

                                               fd, height * pitch);

   if (buffer == NULL)

      return NULL;

   ret = drm_intel_bo_get_tiling(buffer, &tiling, &bit_6_swizzle);

   if (ret != 0) {

      fprintf(stderr, "Couldn't get tiling of buffer (%s): %s\n",

	      name, strerror(-ret));

      drm_intel_bo_unreference(buffer);

      return NULL;

   }

   region = intel_region_alloc_internal(screen, cpp,

					width, height, pitch, tiling, buffer);

   if (region == NULL) {

      drm_intel_bo_unreference(buffer);

      return NULL;

   }

   return region;

}

void

intel_region_reference(struct intel_region **dst, struct intel_region *src)

{

   _DBG("%s: %p(%d) -> %p(%d)\n", __FUNCTION__,

	*dst, *dst ? (*dst)->refcount : 0, src, src ? src->refcount : 0);

   if (src != *dst) {

      if (*dst)

	 intel_region_release(dst);

      if (src)

         src->refcount++;

      *dst = src;

   }

}

void

intel_region_release(struct intel_region **region_handle)

{

   struct intel_region *region = *region_handle;

   if (region == NULL) {

      _DBG("%s NULL\n", __FUNCTION__);

      return;

   }

   _DBG("%s %p %d\n", __FUNCTION__, region, region->refcount - 1);

   ASSERT(region->refcount > 0);

   region->refcount--;

   if (region->refcount == 0) {

      drm_intel_bo_unreference(region->bo);

      free(region);

   }

   *region_handle = NULL;

}

/**

 * This function computes masks that may be used to select the bits of the X

 * and Y coordinates that indicate the offset within a tile.  If the region is

 * untiled, the masks are set to 0.

 */

void

intel_region_get_tile_masks(struct intel_region *region,

                            uint32_t *mask_x, uint32_t *mask_y,

                            bool map_stencil_as_y_tiled)

{

   int cpp = region->cpp;

   uint32_t tiling = region->tiling;

   if (map_stencil_as_y_tiled)

      tiling = I915_TILING_Y;

   switch (tiling) {

   default:

      assert(false);

   case I915_TILING_NONE:

      *mask_x = *mask_y = 0;

      break;

   case I915_TILING_X:

      *mask_x = 512 / cpp - 1;

      *mask_y = 7;

      break;

   case I915_TILING_Y:

      *mask_x = 128 / cpp - 1;

      *mask_y = 31;

      break;

   }

}

/**

 * Compute the offset (in bytes) from the start of the region to the given x

 * and y coordinate.  For tiled regions, caller must ensure that x and y are

 * multiples of the tile size.

 */

uint32_t

intel_region_get_aligned_offset(struct intel_region *region, uint32_t x,

                                uint32_t y, bool map_stencil_as_y_tiled)

{

   int cpp = region->cpp;

   uint32_t pitch = region->pitch;

   uint32_t tiling = region->tiling;

   if (map_stencil_as_y_tiled) {

      tiling = I915_TILING_Y;

      /* When mapping a W-tiled stencil buffer as Y-tiled, each 64-high W-tile

       * gets transformed into a 32-high Y-tile.  Accordingly, the pitch of

       * the resulting region is twice the pitch of the original region, since

       * each row in the Y-tiled view corresponds to two rows in the actual

       * W-tiled surface.  So we need to correct the pitch before computing

       * the offsets.

       */

      pitch *= 2;

   }

   switch (tiling) {

   default:

      assert(false);

   case I915_TILING_NONE:

      return y * pitch + x * cpp;

   case I915_TILING_X:

      assert((x % (512 / cpp)) == 0);

      assert((y % 8) == 0);

      return y * pitch + x / (512 / cpp) * 4096;

   case I915_TILING_Y:

      assert((x % (128 / cpp)) == 0);

      assert((y % 32) == 0);

      return y * pitch + x / (128 / cpp) * 4096;

   }

}