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drm/i915: cache the last object lookup during pin_and_relocate()

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The most frequent relocation within a batchbuffer is a contiguous sequence
of vertex buffer relocations, for which we can virtually eliminate the
drm_gem_object_lookup() overhead by caching the last handle to object
translation.

In doing so we refactor the pin and relocate retry loop out of
do_execbuffer into its own helper function and so improve the error
paths.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
This commit is contained in:
Chris Wilson 2010-10-17 10:01:56 +01:00
parent 1d7cfea152
commit 9af90d19f8
1 changed files with 144 additions and 171 deletions
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315
drivers/gpu/drm/i915/i915_gem.c
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@ -2152,6 +2152,7 @@ i915_gem_object_unbind(struct drm_gem_object *obj)
drm_mm_put_block(obj_priv->gtt_space); drm_mm_put_block(obj_priv->gtt_space);
obj_priv->gtt_space = NULL; obj_priv->gtt_space = NULL;
obj_priv->gtt_offset = 0;
if (i915_gem_object_is_purgeable(obj_priv)) if (i915_gem_object_is_purgeable(obj_priv))
i915_gem_object_truncate(obj); i915_gem_object_truncate(obj);
@ -2645,12 +2646,9 @@ i915_gem_object_bind_to_gtt(struct drm_gem_object *obj, unsigned alignment)
search_free: search_free:
free_space = drm_mm_search_free(&dev_priv->mm.gtt_space, free_space = drm_mm_search_free(&dev_priv->mm.gtt_space,
obj->size, alignment, 0); obj->size, alignment, 0);
if (free_space != NULL) { if (free_space != NULL)
obj_priv->gtt_space = drm_mm_get_block(free_space, obj->size, obj_priv->gtt_space = drm_mm_get_block(free_space, obj->size,
alignment); alignment);
if (obj_priv->gtt_space != NULL)
obj_priv->gtt_offset = obj_priv->gtt_space->start;
}
if (obj_priv->gtt_space == NULL) { if (obj_priv->gtt_space == NULL) {
/* If the gtt is empty and we're still having trouble /* If the gtt is empty and we're still having trouble
* fitting our object in, we're out of memory. * fitting our object in, we're out of memory.
@ -2693,7 +2691,7 @@ i915_gem_object_bind_to_gtt(struct drm_gem_object *obj, unsigned alignment)
obj_priv->agp_mem = drm_agp_bind_pages(dev, obj_priv->agp_mem = drm_agp_bind_pages(dev,
obj_priv->pages, obj_priv->pages,
obj->size >> PAGE_SHIFT, obj->size >> PAGE_SHIFT,
obj_priv->gtt_offset, obj_priv->gtt_space->start,
obj_priv->agp_type); obj_priv->agp_type);
if (obj_priv->agp_mem == NULL) { if (obj_priv->agp_mem == NULL) {
i915_gem_object_put_pages(obj); i915_gem_object_put_pages(obj);
@ -2718,6 +2716,7 @@ i915_gem_object_bind_to_gtt(struct drm_gem_object *obj, unsigned alignment)
BUG_ON(obj->read_domains & I915_GEM_GPU_DOMAINS); BUG_ON(obj->read_domains & I915_GEM_GPU_DOMAINS);
BUG_ON(obj->write_domain & I915_GEM_GPU_DOMAINS); BUG_ON(obj->write_domain & I915_GEM_GPU_DOMAINS);
obj_priv->gtt_offset = obj_priv->gtt_space->start;
trace_i915_gem_object_bind(obj, obj_priv->gtt_offset); trace_i915_gem_object_bind(obj, obj_priv->gtt_offset);
return 0; return 0;
@ -3240,74 +3239,42 @@ i915_gem_object_set_cpu_read_domain_range(struct drm_gem_object *obj,
* Pin an object to the GTT and evaluate the relocations landing in it. * Pin an object to the GTT and evaluate the relocations landing in it.
*/ */
static int static int
i915_gem_object_pin_and_relocate(struct drm_gem_object *obj, i915_gem_execbuffer_relocate(struct drm_i915_gem_object *obj,
struct drm_file *file_priv, struct drm_file *file_priv,
struct drm_i915_gem_exec_object2 *entry) struct drm_i915_gem_exec_object2 *entry)
{ {
struct drm_device *dev = obj->dev; struct drm_device *dev = obj->base.dev;
drm_i915_private_t *dev_priv = dev->dev_private; drm_i915_private_t *dev_priv = dev->dev_private;
struct drm_i915_gem_object *obj_priv = to_intel_bo(obj);
struct drm_i915_gem_relocation_entry __user *user_relocs; struct drm_i915_gem_relocation_entry __user *user_relocs;
int i, ret; struct drm_gem_object *target_obj = NULL;
bool need_fence; uint32_t target_handle = 0;
int i, ret = 0;
need_fence = entry->flags & EXEC_OBJECT_NEEDS_FENCE &&
obj_priv->tiling_mode != I915_TILING_NONE;
/* Check fence reg constraints and rebind if necessary */
if (need_fence &&
!i915_gem_object_fence_offset_ok(obj,
obj_priv->tiling_mode)) {
ret = i915_gem_object_unbind(obj);
if (ret)
return ret;
}
/* Choose the GTT offset for our buffer and put it there. */
ret = i915_gem_object_pin(obj, (uint32_t) entry->alignment);
if (ret)
return ret;
/*
* Pre-965 chips need a fence register set up in order to
* properly handle blits to/from tiled surfaces.
*/
if (need_fence) {
ret = i915_gem_object_get_fence_reg(obj, true);
if (ret != 0) {
i915_gem_object_unpin(obj);
return ret;
}
dev_priv->fence_regs[obj_priv->fence_reg].gpu = true;
}
entry->offset = obj_priv->gtt_offset;
/* Apply the relocations, using the GTT aperture to avoid cache
* flushing requirements.
*/
user_relocs = (void __user *)(uintptr_t)entry->relocs_ptr; user_relocs = (void __user *)(uintptr_t)entry->relocs_ptr;
for (i = 0; i < entry->relocation_count; i++) { for (i = 0; i < entry->relocation_count; i++) {
struct drm_i915_gem_relocation_entry reloc; struct drm_i915_gem_relocation_entry reloc;
struct drm_gem_object *target_obj; uint32_t target_offset;
struct drm_i915_gem_object *target_obj_priv;
ret = __copy_from_user_inatomic(&reloc, if (__copy_from_user_inatomic(&reloc,
user_relocs+i, user_relocs+i,
sizeof(reloc)); sizeof(reloc))) {
if (ret) { ret = -EFAULT;
i915_gem_object_unpin(obj); break;
return -EFAULT;
} }
target_obj = drm_gem_object_lookup(obj->dev, file_priv, if (reloc.target_handle != target_handle) {
reloc.target_handle); drm_gem_object_unreference(target_obj);
if (target_obj == NULL) {
i915_gem_object_unpin(obj); target_obj = drm_gem_object_lookup(dev, file_priv,
return -ENOENT; reloc.target_handle);
if (target_obj == NULL) {
ret = -ENOENT;
break;
}
target_handle = reloc.target_handle;
} }
target_obj_priv = to_intel_bo(target_obj); target_offset = to_intel_bo(target_obj)->gtt_offset;
#if WATCH_RELOC #if WATCH_RELOC
DRM_INFO("%s: obj %p offset %08x target %d " DRM_INFO("%s: obj %p offset %08x target %d "
@ -3319,7 +3286,7 @@ i915_gem_object_pin_and_relocate(struct drm_gem_object *obj,
(int) reloc.target_handle, (int) reloc.target_handle,
(int) reloc.read_domains, (int) reloc.read_domains,
(int) reloc.write_domain, (int) reloc.write_domain,
(int) target_obj_priv->gtt_offset, (int) target_offset,
(int) reloc.presumed_offset, (int) reloc.presumed_offset,
reloc.delta); reloc.delta);
#endif #endif
@ -3327,12 +3294,11 @@ i915_gem_object_pin_and_relocate(struct drm_gem_object *obj,
/* The target buffer should have appeared before us in the /* The target buffer should have appeared before us in the
* exec_object list, so it should have a GTT space bound by now. * exec_object list, so it should have a GTT space bound by now.
*/ */
if (target_obj_priv->gtt_space == NULL) { if (target_offset == 0) {
DRM_ERROR("No GTT space found for object %d\n", DRM_ERROR("No GTT space found for object %d\n",
reloc.target_handle); reloc.target_handle);
drm_gem_object_unreference(target_obj); ret = -EINVAL;
i915_gem_object_unpin(obj); break;
return -EINVAL;
} }
/* Validate that the target is in a valid r/w GPU domain */ /* Validate that the target is in a valid r/w GPU domain */
@ -3344,9 +3310,8 @@ i915_gem_object_pin_and_relocate(struct drm_gem_object *obj,
(int) reloc.offset, (int) reloc.offset,
reloc.read_domains, reloc.read_domains,
reloc.write_domain); reloc.write_domain);
drm_gem_object_unreference(target_obj); ret = -EINVAL;
i915_gem_object_unpin(obj); break;
return -EINVAL;
} }
if (reloc.write_domain & I915_GEM_DOMAIN_CPU || if (reloc.write_domain & I915_GEM_DOMAIN_CPU ||
reloc.read_domains & I915_GEM_DOMAIN_CPU) { reloc.read_domains & I915_GEM_DOMAIN_CPU) {
@ -3357,9 +3322,8 @@ i915_gem_object_pin_and_relocate(struct drm_gem_object *obj,
(int) reloc.offset, (int) reloc.offset,
reloc.read_domains, reloc.read_domains,
reloc.write_domain); reloc.write_domain);
drm_gem_object_unreference(target_obj); ret = -EINVAL;
i915_gem_object_unpin(obj); break;
return -EINVAL;
} }
if (reloc.write_domain && target_obj->pending_write_domain && if (reloc.write_domain && target_obj->pending_write_domain &&
reloc.write_domain != target_obj->pending_write_domain) { reloc.write_domain != target_obj->pending_write_domain) {
@ -3370,40 +3334,35 @@ i915_gem_object_pin_and_relocate(struct drm_gem_object *obj,
(int) reloc.offset, (int) reloc.offset,
reloc.write_domain, reloc.write_domain,
target_obj->pending_write_domain); target_obj->pending_write_domain);
drm_gem_object_unreference(target_obj); ret = -EINVAL;
i915_gem_object_unpin(obj); break;
return -EINVAL;
} }
target_obj->pending_read_domains |= reloc.read_domains; target_obj->pending_read_domains |= reloc.read_domains;
target_obj->pending_write_domain |= reloc.write_domain; target_obj->pending_write_domain = reloc.write_domain;
/* If the relocation already has the right value in it, no /* If the relocation already has the right value in it, no
* more work needs to be done. * more work needs to be done.
*/ */
if (target_obj_priv->gtt_offset == reloc.presumed_offset) { if (target_offset == reloc.presumed_offset)
drm_gem_object_unreference(target_obj);
continue; continue;
}
/* Check that the relocation address is valid... */ /* Check that the relocation address is valid... */
if (reloc.offset > obj->size - 4) { if (reloc.offset > obj->base.size - 4) {
DRM_ERROR("Relocation beyond object bounds: " DRM_ERROR("Relocation beyond object bounds: "
"obj %p target %d offset %d size %d.\n", "obj %p target %d offset %d size %d.\n",
obj, reloc.target_handle, obj, reloc.target_handle,
(int) reloc.offset, (int) obj->size); (int) reloc.offset, (int) obj->base.size);
drm_gem_object_unreference(target_obj); ret = -EINVAL;
i915_gem_object_unpin(obj); break;
return -EINVAL;
} }
if (reloc.offset & 3) { if (reloc.offset & 3) {
DRM_ERROR("Relocation not 4-byte aligned: " DRM_ERROR("Relocation not 4-byte aligned: "
"obj %p target %d offset %d.\n", "obj %p target %d offset %d.\n",
obj, reloc.target_handle, obj, reloc.target_handle,
(int) reloc.offset); (int) reloc.offset);
drm_gem_object_unreference(target_obj); ret = -EINVAL;
i915_gem_object_unpin(obj); break;
return -EINVAL;
} }
/* and points to somewhere within the target object. */ /* and points to somewhere within the target object. */
@ -3412,33 +3371,28 @@ i915_gem_object_pin_and_relocate(struct drm_gem_object *obj,
"obj %p target %d delta %d size %d.\n", "obj %p target %d delta %d size %d.\n",
obj, reloc.target_handle, obj, reloc.target_handle,
(int) reloc.delta, (int) target_obj->size); (int) reloc.delta, (int) target_obj->size);
drm_gem_object_unreference(target_obj); ret = -EINVAL;
i915_gem_object_unpin(obj); break;
return -EINVAL;
} }
reloc.delta += target_obj_priv->gtt_offset; reloc.delta += target_offset;
if (obj->write_domain == I915_GEM_DOMAIN_CPU) { if (obj->base.write_domain == I915_GEM_DOMAIN_CPU) {
uint32_t page_offset = reloc.offset & ~PAGE_MASK; uint32_t page_offset = reloc.offset & ~PAGE_MASK;
char *vaddr; char *vaddr;
vaddr = kmap_atomic(obj_priv->pages[reloc.offset >> PAGE_SHIFT], KM_USER0); vaddr = kmap_atomic(obj->pages[reloc.offset >> PAGE_SHIFT], KM_USER0);
*(uint32_t *)(vaddr + page_offset) = reloc.delta; *(uint32_t *)(vaddr + page_offset) = reloc.delta;
kunmap_atomic(vaddr, KM_USER0); kunmap_atomic(vaddr, KM_USER0);
} else { } else {
uint32_t __iomem *reloc_entry; uint32_t __iomem *reloc_entry;
void __iomem *reloc_page; void __iomem *reloc_page;
int ret;
ret = i915_gem_object_set_to_gtt_domain(obj, 1); ret = i915_gem_object_set_to_gtt_domain(&obj->base, 1);
if (ret) { if (ret)
drm_gem_object_unreference(target_obj); break;
i915_gem_object_unpin(obj);
return ret;
}
/* Map the page containing the relocation we're going to perform. */ /* Map the page containing the relocation we're going to perform. */
reloc.offset += obj_priv->gtt_offset; reloc.offset += obj->gtt_offset;
reloc_page = io_mapping_map_atomic_wc(dev_priv->mm.gtt_mapping, reloc_page = io_mapping_map_atomic_wc(dev_priv->mm.gtt_mapping,
reloc.offset & PAGE_MASK, reloc.offset & PAGE_MASK,
KM_USER0); KM_USER0);
@ -3447,8 +3401,74 @@ i915_gem_object_pin_and_relocate(struct drm_gem_object *obj,
iowrite32(reloc.delta, reloc_entry); iowrite32(reloc.delta, reloc_entry);
io_mapping_unmap_atomic(reloc_page, KM_USER0); io_mapping_unmap_atomic(reloc_page, KM_USER0);
} }
}
drm_gem_object_unreference(target_obj); drm_gem_object_unreference(target_obj);
return ret;
}
static int
i915_gem_execbuffer_pin(struct drm_device *dev,
struct drm_file *file,
struct drm_gem_object **object_list,
struct drm_i915_gem_exec_object2 *exec_list,
int count)
{
struct drm_i915_private *dev_priv = dev->dev_private;
int ret, i, retry;
/* attempt to pin all of the buffers into the GTT */
for (retry = 0; retry < 2; retry++) {
ret = 0;
for (i = 0; i < count; i++) {
struct drm_i915_gem_exec_object2 *entry = &exec_list[i];
struct drm_i915_gem_object *obj= to_intel_bo(object_list[i]);
bool need_fence =
entry->flags & EXEC_OBJECT_NEEDS_FENCE &&
obj->tiling_mode != I915_TILING_NONE;
/* Check fence reg constraints and rebind if necessary */
if (need_fence &&
!i915_gem_object_fence_offset_ok(&obj->base,
obj->tiling_mode)) {
ret = i915_gem_object_unbind(&obj->base);
if (ret)
break;
}
ret = i915_gem_object_pin(&obj->base, entry->alignment);
if (ret)
break;
/*
* Pre-965 chips need a fence register set up in order
* to properly handle blits to/from tiled surfaces.
*/
if (need_fence) {
ret = i915_gem_object_get_fence_reg(&obj->base, true);
if (ret) {
i915_gem_object_unpin(&obj->base);
break;
}
dev_priv->fence_regs[obj->fence_reg].gpu = true;
}
entry->offset = obj->gtt_offset;
}
while (i--)
i915_gem_object_unpin(object_list[i]);
if (ret == 0)
break;
if (ret != -ENOSPC || retry)
return ret;
ret = i915_gem_evict_everything(dev);
if (ret)
return ret;
} }
return 0; return 0;
@ -3551,7 +3571,7 @@ validate_exec_list(struct drm_i915_gem_exec_object2 *exec,
static int static int
i915_gem_do_execbuffer(struct drm_device *dev, void *data, i915_gem_do_execbuffer(struct drm_device *dev, void *data,
struct drm_file *file_priv, struct drm_file *file,
struct drm_i915_gem_execbuffer2 *args, struct drm_i915_gem_execbuffer2 *args,
struct drm_i915_gem_exec_object2 *exec_list) struct drm_i915_gem_exec_object2 *exec_list)
{ {
@ -3561,9 +3581,8 @@ i915_gem_do_execbuffer(struct drm_device *dev, void *data,
struct drm_i915_gem_object *obj_priv; struct drm_i915_gem_object *obj_priv;
struct drm_clip_rect *cliprects = NULL; struct drm_clip_rect *cliprects = NULL;
struct drm_i915_gem_request *request = NULL; struct drm_i915_gem_request *request = NULL;
int ret, i, pinned = 0; int ret, i, flips;
uint64_t exec_offset; uint64_t exec_offset;
int pin_tries, flips;
struct intel_ring_buffer *ring = NULL; struct intel_ring_buffer *ring = NULL;
@ -3639,7 +3658,7 @@ i915_gem_do_execbuffer(struct drm_device *dev, void *data,
/* Look up object handles */ /* Look up object handles */
for (i = 0; i < args->buffer_count; i++) { for (i = 0; i < args->buffer_count; i++) {
object_list[i] = drm_gem_object_lookup(dev, file_priv, object_list[i] = drm_gem_object_lookup(dev, file,
exec_list[i].handle); exec_list[i].handle);
if (object_list[i] == NULL) { if (object_list[i] == NULL) {
DRM_ERROR("Invalid object handle %d at index %d\n", DRM_ERROR("Invalid object handle %d at index %d\n",
@ -3662,63 +3681,20 @@ i915_gem_do_execbuffer(struct drm_device *dev, void *data,
obj_priv->in_execbuffer = true; obj_priv->in_execbuffer = true;
} }
/* Pin and relocate */ /* Move the objects en-masse into the GTT, evicting if necessary. */
for (pin_tries = 0; ; pin_tries++) { ret = i915_gem_execbuffer_pin(dev, file,
ret = 0; object_list, exec_list,
args->buffer_count);
if (ret)
goto err;
for (i = 0; i < args->buffer_count; i++) { /* The objects are in their final locations, apply the relocations. */
object_list[i]->pending_read_domains = 0; for (i = 0; i < args->buffer_count; i++) {
object_list[i]->pending_write_domain = 0; struct drm_i915_gem_object *obj = to_intel_bo(object_list[i]);
ret = i915_gem_object_pin_and_relocate(object_list[i], obj->base.pending_read_domains = 0;
file_priv, obj->base.pending_write_domain = 0;
&exec_list[i]); ret = i915_gem_execbuffer_relocate(obj, file, &exec_list[i]);
if (ret) if (ret)
break;
pinned = i + 1;
}
/* success */
if (ret == 0)
break;
/* error other than GTT full, or we've already tried again */
if (ret != -ENOSPC || pin_tries >= 1) {
if (ret != -ERESTARTSYS) {
unsigned long long total_size = 0;
int num_fences = 0;
for (i = 0; i < args->buffer_count; i++) {
obj_priv = to_intel_bo(object_list[i]);
total_size += object_list[i]->size;
num_fences +=
exec_list[i].flags & EXEC_OBJECT_NEEDS_FENCE &&
obj_priv->tiling_mode != I915_TILING_NONE;
}
DRM_ERROR("Failed to pin buffer %d of %d, total %llu bytes, %d fences: %d\n",
pinned+1, args->buffer_count,
total_size, num_fences,
ret);
DRM_ERROR("%u objects [%u pinned, %u GTT], "
"%zu object bytes [%zu pinned], "
"%zu /%zu gtt bytes\n",
dev_priv->mm.object_count,
dev_priv->mm.pin_count,
dev_priv->mm.gtt_count,
dev_priv->mm.object_memory,
dev_priv->mm.pin_memory,
dev_priv->mm.gtt_memory,
dev_priv->mm.gtt_total);
}
goto err;
}
/* unpin all of our buffers */
for (i = 0; i < pinned; i++)
i915_gem_object_unpin(object_list[i]);
pinned = 0;
/* evict everyone we can from the aperture */
ret = i915_gem_evict_everything(dev);
if (ret && ret != -ENOSPC)
goto err; goto err;
} }
@ -3731,9 +3707,9 @@ i915_gem_do_execbuffer(struct drm_device *dev, void *data,
} }
batch_obj->pending_read_domains |= I915_GEM_DOMAIN_COMMAND; batch_obj->pending_read_domains |= I915_GEM_DOMAIN_COMMAND;
/* Sanity check the batch buffer, prior to moving objects */ /* Sanity check the batch buffer */
exec_offset = exec_list[args->buffer_count - 1].offset; exec_offset = to_intel_bo(batch_obj)->gtt_offset;
ret = i915_gem_check_execbuffer (args, exec_offset); ret = i915_gem_check_execbuffer(args, exec_offset);
if (ret != 0) { if (ret != 0) {
DRM_ERROR("execbuf with invalid offset/length\n"); DRM_ERROR("execbuf with invalid offset/length\n");
goto err; goto err;
@ -3761,7 +3737,7 @@ i915_gem_do_execbuffer(struct drm_device *dev, void *data,
dev->invalidate_domains, dev->invalidate_domains,
dev->flush_domains); dev->flush_domains);
#endif #endif
i915_gem_flush(dev, file_priv, i915_gem_flush(dev, file,
dev->invalidate_domains, dev->invalidate_domains,
dev->flush_domains, dev->flush_domains,
dev_priv->mm.flush_rings); dev_priv->mm.flush_rings);
@ -3846,13 +3822,10 @@ i915_gem_do_execbuffer(struct drm_device *dev, void *data,
i915_gem_object_move_to_active(obj, ring); i915_gem_object_move_to_active(obj, ring);
} }
i915_add_request(dev, file_priv, request, ring); i915_add_request(dev, file, request, ring);
request = NULL; request = NULL;
err: err:
for (i = 0; i < pinned; i++)
i915_gem_object_unpin(object_list[i]);
for (i = 0; i < args->buffer_count; i++) { for (i = 0; i < args->buffer_count; i++) {
if (object_list[i]) { if (object_list[i]) {
obj_priv = to_intel_bo(object_list[i]); obj_priv = to_intel_bo(object_list[i]);