diff options
Diffstat (limited to 'libdrm')
| -rw-r--r-- | libdrm/intel/intel_bufmgr_gem.c | 137 |
1 files changed, 134 insertions, 3 deletions
diff --git a/libdrm/intel/intel_bufmgr_gem.c b/libdrm/intel/intel_bufmgr_gem.c index 081eb2ad..dd74659a 100644 --- a/libdrm/intel/intel_bufmgr_gem.c +++ b/libdrm/intel/intel_bufmgr_gem.c @@ -94,6 +94,8 @@ typedef struct _dri_bufmgr_gem { /** Array of lists of cached gem objects of power-of-two sizes */ struct dri_gem_bo_bucket cache_bucket[INTEL_GEM_BO_BUCKETS]; + + uint64_t gtt_size; } dri_bufmgr_gem; struct _dri_bo_gem { @@ -134,6 +136,27 @@ struct _dri_bo_gem { /** free list */ dri_bo_gem *next; + + /** + * Boolean of whether this BO and its children have been included in + * the current dri_bufmgr_check_aperture_space() total. + */ + char included_in_check_aperture; + + /** + * Boolean of whether this buffer has been used as a relocation + * target and had its size accounted for, and thus can't have any + * further relocations added to it. + */ + char used_as_reloc_target; + + /** + * Size in bytes of this buffer and its relocation descendents. + * + * Used to avoid costly tree walking in dri_bufmgr_check_aperture in + * the common case. + */ + int reloc_tree_size; }; static void dri_gem_bo_reference_locked(dri_bo *bo); @@ -333,6 +356,8 @@ dri_gem_bo_alloc(dri_bufmgr *bufmgr, const char *name, bo_gem->name = name; bo_gem->refcount = 1; bo_gem->validate_index = -1; + bo_gem->reloc_tree_size = bo_gem->bo.size; + bo_gem->used_as_reloc_target = 0; DBG("bo_create: buf %d (%s) %ldb\n", bo_gem->gem_handle, bo_gem->name, size); @@ -699,6 +724,15 @@ dri_gem_bo_emit_reloc(dri_bo *bo, uint32_t read_domains, uint32_t write_domain, assert (offset <= bo->size - 4); assert ((write_domain & (write_domain-1)) == 0); + /* Make sure that we're not adding a reloc to something whose size has + * already been accounted for. + */ + assert(!bo_gem->used_as_reloc_target); + bo_gem->reloc_tree_size += target_bo_gem->reloc_tree_size; + + /* Flag the target to disallow further relocations in it. */ + target_bo_gem->used_as_reloc_target = 1; + bo_gem->relocs[bo_gem->reloc_count].offset = offset; bo_gem->relocs[bo_gem->reloc_count].delta = delta; bo_gem->relocs[bo_gem->reloc_count].target_handle = @@ -933,13 +967,96 @@ intel_bufmgr_gem_enable_reuse(dri_bufmgr *bufmgr) } } -/* +/** + * Return the additional aperture space required by the tree of buffer objects + * rooted at bo. + */ +static int +dri_gem_bo_get_aperture_space(dri_bo *bo) +{ + dri_bo_gem *bo_gem = (dri_bo_gem *)bo; + int i; + int total = 0; + + if (bo == NULL || bo_gem->included_in_check_aperture) + return 0; + + total += bo->size; + bo_gem->included_in_check_aperture = 1; + + for (i = 0; i < bo_gem->reloc_count; i++) + total += dri_gem_bo_get_aperture_space(bo_gem->reloc_target_bo[i]); + + return total; +} + +/** + * Clear the flag set by dri_gem_bo_get_aperture_space() so we're ready for + * the next dri_bufmgr_check_aperture_space() call. + */ +static void +dri_gem_bo_clear_aperture_space_flag(dri_bo *bo) +{ + dri_bo_gem *bo_gem = (dri_bo_gem *)bo; + int i; + + if (bo == NULL || !bo_gem->included_in_check_aperture) + return; + + bo_gem->included_in_check_aperture = 0; + + for (i = 0; i < bo_gem->reloc_count; i++) + dri_gem_bo_clear_aperture_space_flag(bo_gem->reloc_target_bo[i]); +} + +/** + * Return -1 if the batchbuffer should be flushed before attempting to + * emit rendering referencing the buffers pointed to by bo_array. + * + * This is required because if we try to emit a batchbuffer with relocations + * to a tree of buffers that won't simultaneously fit in the aperture, + * the rendering will return an error at a point where the software is not + * prepared to recover from it. * + * However, we also want to emit the batchbuffer significantly before we reach + * the limit, as a series of batchbuffers each of which references buffers + * covering almost all of the aperture means that at each emit we end up + * waiting to evict a buffer from the last rendering, and we get synchronous + * performance. By emitting smaller batchbuffers, we eat some CPU overhead to + * get better parallelism. */ static int dri_gem_check_aperture_space(dri_bo **bo_array, int count) { - return 0; + dri_bufmgr_gem *bufmgr_gem = (dri_bufmgr_gem *)bo_array[0]->bufmgr; + unsigned int total = 0; + unsigned int threshold = bufmgr_gem->gtt_size * 3 / 4; + int i; + + for (i = 0; i < count; i++) { + dri_bo_gem *bo_gem = (dri_bo_gem *)bo_array[i]; + if (bo_gem != NULL) + total += bo_gem->reloc_tree_size; + } + + if (total > threshold) { + total = 0; + for (i = 0; i < count; i++) + total += dri_gem_bo_get_aperture_space(bo_array[i]); + + for (i = 0; i < count; i++) + dri_gem_bo_clear_aperture_space_flag(bo_array[i]); + } + + if (total > bufmgr_gem->gtt_size * 3 / 4) { + DBG("check_space: overflowed available aperture, %dkb vs %dkb\n", + total / 1024, (int)bufmgr_gem->gtt_size / 1024); + return -1; + } else { + DBG("drm_check_space: total %dkb vs bufgr %dkb\n", total / 1024 , + (int)bufmgr_gem->gtt_size / 1024); + return 0; + } } /** @@ -952,7 +1069,8 @@ dri_bufmgr * intel_bufmgr_gem_init(int fd, int batch_size) { dri_bufmgr_gem *bufmgr_gem; - int i; + struct drm_i915_gem_get_aperture aperture; + int ret, i; bufmgr_gem = calloc(1, sizeof(*bufmgr_gem)); bufmgr_gem->fd = fd; @@ -962,6 +1080,19 @@ intel_bufmgr_gem_init(int fd, int batch_size) return NULL; } + ret = ioctl(bufmgr_gem->fd, DRM_IOCTL_I915_GEM_GET_APERTURE, &aperture); + + if (ret == 0) + bufmgr_gem->gtt_size = aperture.aper_available_size; + else { + fprintf(stderr, "DRM_IOCTL_I915_GEM_APERTURE failed: %s\n", + strerror(errno)); + bufmgr_gem->gtt_size = 128 * 1024 * 1024; + fprintf(stderr, "Assuming %dkB available aperture size.\n" + "May lead to reduced performance or incorrect rendering.\n", + (int)bufmgr_gem->gtt_size / 1024); + } + /* Let's go with one relocation per every 2 dwords (but round down a bit * since a power of two will mean an extra page allocation for the reloc * buffer). |