--- /dev/null
+/*
+ * Copyright © 2008,2010 Intel Corporation
+ *
+ * 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, sublicense,
+ * 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 NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS 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.
+ *
+ * Authors:
+ * Eric Anholt <eric@anholt.net>
+ * Chris Wilson <chris@chris-wilson.co.uk>
+ *
+ */
+
+#include "drmP.h"
+#include "drm.h"
+#include "i915_drm.h"
+#include "i915_drv.h"
+#include "i915_trace.h"
+#include "intel_drv.h"
+
+struct change_domains {
+ uint32_t invalidate_domains;
+ uint32_t flush_domains;
+ uint32_t flush_rings;
+};
+
+/*
+ * Set the next domain for the specified object. This
+ * may not actually perform the necessary flushing/invaliding though,
+ * as that may want to be batched with other set_domain operations
+ *
+ * This is (we hope) the only really tricky part of gem. The goal
+ * is fairly simple -- track which caches hold bits of the object
+ * and make sure they remain coherent. A few concrete examples may
+ * help to explain how it works. For shorthand, we use the notation
+ * (read_domains, write_domain), e.g. (CPU, CPU) to indicate the
+ * a pair of read and write domain masks.
+ *
+ * Case 1: the batch buffer
+ *
+ * 1. Allocated
+ * 2. Written by CPU
+ * 3. Mapped to GTT
+ * 4. Read by GPU
+ * 5. Unmapped from GTT
+ * 6. Freed
+ *
+ * Let's take these a step at a time
+ *
+ * 1. Allocated
+ * Pages allocated from the kernel may still have
+ * cache contents, so we set them to (CPU, CPU) always.
+ * 2. Written by CPU (using pwrite)
+ * The pwrite function calls set_domain (CPU, CPU) and
+ * this function does nothing (as nothing changes)
+ * 3. Mapped by GTT
+ * This function asserts that the object is not
+ * currently in any GPU-based read or write domains
+ * 4. Read by GPU
+ * i915_gem_execbuffer calls set_domain (COMMAND, 0).
+ * As write_domain is zero, this function adds in the
+ * current read domains (CPU+COMMAND, 0).
+ * flush_domains is set to CPU.
+ * invalidate_domains is set to COMMAND
+ * clflush is run to get data out of the CPU caches
+ * then i915_dev_set_domain calls i915_gem_flush to
+ * emit an MI_FLUSH and drm_agp_chipset_flush
+ * 5. Unmapped from GTT
+ * i915_gem_object_unbind calls set_domain (CPU, CPU)
+ * flush_domains and invalidate_domains end up both zero
+ * so no flushing/invalidating happens
+ * 6. Freed
+ * yay, done
+ *
+ * Case 2: The shared render buffer
+ *
+ * 1. Allocated
+ * 2. Mapped to GTT
+ * 3. Read/written by GPU
+ * 4. set_domain to (CPU,CPU)
+ * 5. Read/written by CPU
+ * 6. Read/written by GPU
+ *
+ * 1. Allocated
+ * Same as last example, (CPU, CPU)
+ * 2. Mapped to GTT
+ * Nothing changes (assertions find that it is not in the GPU)
+ * 3. Read/written by GPU
+ * execbuffer calls set_domain (RENDER, RENDER)
+ * flush_domains gets CPU
+ * invalidate_domains gets GPU
+ * clflush (obj)
+ * MI_FLUSH and drm_agp_chipset_flush
+ * 4. set_domain (CPU, CPU)
+ * flush_domains gets GPU
+ * invalidate_domains gets CPU
+ * wait_rendering (obj) to make sure all drawing is complete.
+ * This will include an MI_FLUSH to get the data from GPU
+ * to memory
+ * clflush (obj) to invalidate the CPU cache
+ * Another MI_FLUSH in i915_gem_flush (eliminate this somehow?)
+ * 5. Read/written by CPU
+ * cache lines are loaded and dirtied
+ * 6. Read written by GPU
+ * Same as last GPU access
+ *
+ * Case 3: The constant buffer
+ *
+ * 1. Allocated
+ * 2. Written by CPU
+ * 3. Read by GPU
+ * 4. Updated (written) by CPU again
+ * 5. Read by GPU
+ *
+ * 1. Allocated
+ * (CPU, CPU)
+ * 2. Written by CPU
+ * (CPU, CPU)
+ * 3. Read by GPU
+ * (CPU+RENDER, 0)
+ * flush_domains = CPU
+ * invalidate_domains = RENDER
+ * clflush (obj)
+ * MI_FLUSH
+ * drm_agp_chipset_flush
+ * 4. Updated (written) by CPU again
+ * (CPU, CPU)
+ * flush_domains = 0 (no previous write domain)
+ * invalidate_domains = 0 (no new read domains)
+ * 5. Read by GPU
+ * (CPU+RENDER, 0)
+ * flush_domains = CPU
+ * invalidate_domains = RENDER
+ * clflush (obj)
+ * MI_FLUSH
+ * drm_agp_chipset_flush
+ */
+static void
+i915_gem_object_set_to_gpu_domain(struct drm_i915_gem_object *obj,
+ struct intel_ring_buffer *ring,
+ struct change_domains *cd)
+{
+ uint32_t invalidate_domains = 0, flush_domains = 0;
+
+ /*
+ * If the object isn't moving to a new write domain,
+ * let the object stay in multiple read domains
+ */
+ if (obj->base.pending_write_domain == 0)
+ obj->base.pending_read_domains |= obj->base.read_domains;
+
+ /*
+ * Flush the current write domain if
+ * the new read domains don't match. Invalidate
+ * any read domains which differ from the old
+ * write domain
+ */
+ if (obj->base.write_domain &&
+ (((obj->base.write_domain != obj->base.pending_read_domains ||
+ obj->ring != ring)) ||
+ (obj->fenced_gpu_access && !obj->pending_fenced_gpu_access))) {
+ flush_domains |= obj->base.write_domain;
+ invalidate_domains |=
+ obj->base.pending_read_domains & ~obj->base.write_domain;
+ }
+ /*
+ * Invalidate any read caches which may have
+ * stale data. That is, any new read domains.
+ */
+ invalidate_domains |= obj->base.pending_read_domains & ~obj->base.read_domains;
+ if ((flush_domains | invalidate_domains) & I915_GEM_DOMAIN_CPU)
+ i915_gem_clflush_object(obj);
+
+ /* blow away mappings if mapped through GTT */
+ if ((flush_domains | invalidate_domains) & I915_GEM_DOMAIN_GTT)
+ i915_gem_release_mmap(obj);
+
+ /* The actual obj->write_domain will be updated with
+ * pending_write_domain after we emit the accumulated flush for all
+ * of our domain changes in execbuffers (which clears objects'
+ * write_domains). So if we have a current write domain that we
+ * aren't changing, set pending_write_domain to that.
+ */
+ if (flush_domains == 0 && obj->base.pending_write_domain == 0)
+ obj->base.pending_write_domain = obj->base.write_domain;
+
+ cd->invalidate_domains |= invalidate_domains;
+ cd->flush_domains |= flush_domains;
+ if (flush_domains & I915_GEM_GPU_DOMAINS)
+ cd->flush_rings |= obj->ring->id;
+ if (invalidate_domains & I915_GEM_GPU_DOMAINS)
+ cd->flush_rings |= ring->id;
+}
+
+struct eb_objects {
+ int and;
+ struct hlist_head buckets[0];
+};
+
+static struct eb_objects *
+eb_create(int size)
+{
+ struct eb_objects *eb;
+ int count = PAGE_SIZE / sizeof(struct hlist_head) / 2;
+ while (count > size)
+ count >>= 1;
+ eb = kzalloc(count*sizeof(struct hlist_head) +
+ sizeof(struct eb_objects),
+ GFP_KERNEL);
+ if (eb == NULL)
+ return eb;
+
+ eb->and = count - 1;
+ return eb;
+}
+
+static void
+eb_reset(struct eb_objects *eb)
+{
+ memset(eb->buckets, 0, (eb->and+1)*sizeof(struct hlist_head));
+}
+
+static void
+eb_add_object(struct eb_objects *eb, struct drm_i915_gem_object *obj)
+{
+ hlist_add_head(&obj->exec_node,
+ &eb->buckets[obj->exec_handle & eb->and]);
+}
+
+static struct drm_i915_gem_object *
+eb_get_object(struct eb_objects *eb, unsigned long handle)
+{
+ struct hlist_head *head;
+ struct hlist_node *node;
+ struct drm_i915_gem_object *obj;
+
+ head = &eb->buckets[handle & eb->and];
+ hlist_for_each(node, head) {
+ obj = hlist_entry(node, struct drm_i915_gem_object, exec_node);
+ if (obj->exec_handle == handle)
+ return obj;
+ }
+
+ return NULL;
+}
+
+static void
+eb_destroy(struct eb_objects *eb)
+{
+ kfree(eb);
+}
+
+static int
+i915_gem_execbuffer_relocate_entry(struct drm_i915_gem_object *obj,
+ struct eb_objects *eb,
+ struct drm_i915_gem_relocation_entry *reloc)
+{
+ struct drm_device *dev = obj->base.dev;
+ struct drm_gem_object *target_obj;
+ uint32_t target_offset;
+ int ret = -EINVAL;
+
+ /* we've already hold a reference to all valid objects */
+ target_obj = &eb_get_object(eb, reloc->target_handle)->base;
+ if (unlikely(target_obj == NULL))
+ return -ENOENT;
+
+ target_offset = to_intel_bo(target_obj)->gtt_offset;
+
+#if WATCH_RELOC
+ DRM_INFO("%s: obj %p offset %08x target %d "
+ "read %08x write %08x gtt %08x "
+ "presumed %08x delta %08x\n",
+ __func__,
+ obj,
+ (int) reloc->offset,
+ (int) reloc->target_handle,
+ (int) reloc->read_domains,
+ (int) reloc->write_domain,
+ (int) target_offset,
+ (int) reloc->presumed_offset,
+ reloc->delta);
+#endif
+
+ /* The target buffer should have appeared before us in the
+ * exec_object list, so it should have a GTT space bound by now.
+ */
+ if (unlikely(target_offset == 0)) {
+ DRM_ERROR("No GTT space found for object %d\n",
+ reloc->target_handle);
+ return ret;
+ }
+
+ /* Validate that the target is in a valid r/w GPU domain */
+ if (unlikely(reloc->write_domain & (reloc->write_domain - 1))) {
+ DRM_ERROR("reloc with multiple write domains: "
+ "obj %p target %d offset %d "
+ "read %08x write %08x",
+ obj, reloc->target_handle,
+ (int) reloc->offset,
+ reloc->read_domains,
+ reloc->write_domain);
+ return ret;
+ }
+ if (unlikely((reloc->write_domain | reloc->read_domains) & I915_GEM_DOMAIN_CPU)) {
+ DRM_ERROR("reloc with read/write CPU domains: "
+ "obj %p target %d offset %d "
+ "read %08x write %08x",
+ obj, reloc->target_handle,
+ (int) reloc->offset,
+ reloc->read_domains,
+ reloc->write_domain);
+ return ret;
+ }
+ if (unlikely(reloc->write_domain && target_obj->pending_write_domain &&
+ reloc->write_domain != target_obj->pending_write_domain)) {
+ DRM_ERROR("Write domain conflict: "
+ "obj %p target %d offset %d "
+ "new %08x old %08x\n",
+ obj, reloc->target_handle,
+ (int) reloc->offset,
+ reloc->write_domain,
+ target_obj->pending_write_domain);
+ return ret;
+ }
+
+ target_obj->pending_read_domains |= reloc->read_domains;
+ target_obj->pending_write_domain |= reloc->write_domain;
+
+ /* If the relocation already has the right value in it, no
+ * more work needs to be done.
+ */
+ if (target_offset == reloc->presumed_offset)
+ return 0;
+
+ /* Check that the relocation address is valid... */
+ if (unlikely(reloc->offset > obj->base.size - 4)) {
+ DRM_ERROR("Relocation beyond object bounds: "
+ "obj %p target %d offset %d size %d.\n",
+ obj, reloc->target_handle,
+ (int) reloc->offset,
+ (int) obj->base.size);
+ return ret;
+ }
+ if (unlikely(reloc->offset & 3)) {
+ DRM_ERROR("Relocation not 4-byte aligned: "
+ "obj %p target %d offset %d.\n",
+ obj, reloc->target_handle,
+ (int) reloc->offset);
+ return ret;
+ }
+
+ /* and points to somewhere within the target object. */
+ if (unlikely(reloc->delta >= target_obj->size)) {
+ DRM_ERROR("Relocation beyond target object bounds: "
+ "obj %p target %d delta %d size %d.\n",
+ obj, reloc->target_handle,
+ (int) reloc->delta,
+ (int) target_obj->size);
+ return ret;
+ }
+
+ reloc->delta += target_offset;
+ if (obj->base.write_domain == I915_GEM_DOMAIN_CPU) {
+ uint32_t page_offset = reloc->offset & ~PAGE_MASK;
+ char *vaddr;
+
+ vaddr = kmap_atomic(obj->pages[reloc->offset >> PAGE_SHIFT]);
+ *(uint32_t *)(vaddr + page_offset) = reloc->delta;
+ kunmap_atomic(vaddr);
+ } else {
+ struct drm_i915_private *dev_priv = dev->dev_private;
+ uint32_t __iomem *reloc_entry;
+ void __iomem *reloc_page;
+
+ ret = i915_gem_object_set_to_gtt_domain(obj, 1);
+ if (ret)
+ return ret;
+
+ /* Map the page containing the relocation we're going to perform. */
+ reloc->offset += obj->gtt_offset;
+ reloc_page = io_mapping_map_atomic_wc(dev_priv->mm.gtt_mapping,
+ reloc->offset & PAGE_MASK);
+ reloc_entry = (uint32_t __iomem *)
+ (reloc_page + (reloc->offset & ~PAGE_MASK));
+ iowrite32(reloc->delta, reloc_entry);
+ io_mapping_unmap_atomic(reloc_page);
+ }
+
+ /* and update the user's relocation entry */
+ reloc->presumed_offset = target_offset;
+
+ return 0;
+}
+
+static int
+i915_gem_execbuffer_relocate_object(struct drm_i915_gem_object *obj,
+ struct eb_objects *eb)
+{
+ struct drm_i915_gem_relocation_entry __user *user_relocs;
+ struct drm_i915_gem_exec_object2 *entry = obj->exec_entry;
+ int i, ret;
+
+ user_relocs = (void __user *)(uintptr_t)entry->relocs_ptr;
+ for (i = 0; i < entry->relocation_count; i++) {
+ struct drm_i915_gem_relocation_entry reloc;
+
+ if (__copy_from_user_inatomic(&reloc,
+ user_relocs+i,
+ sizeof(reloc)))
+ return -EFAULT;
+
+ ret = i915_gem_execbuffer_relocate_entry(obj, eb, &reloc);
+ if (ret)
+ return ret;
+
+ if (__copy_to_user_inatomic(&user_relocs[i].presumed_offset,
+ &reloc.presumed_offset,
+ sizeof(reloc.presumed_offset)))
+ return -EFAULT;
+ }
+
+ return 0;
+}
+
+static int
+i915_gem_execbuffer_relocate_object_slow(struct drm_i915_gem_object *obj,
+ struct eb_objects *eb,
+ struct drm_i915_gem_relocation_entry *relocs)
+{
+ const struct drm_i915_gem_exec_object2 *entry = obj->exec_entry;
+ int i, ret;
+
+ for (i = 0; i < entry->relocation_count; i++) {
+ ret = i915_gem_execbuffer_relocate_entry(obj, eb, &relocs[i]);
+ if (ret)
+ return ret;
+ }
+
+ return 0;
+}
+
+static int
+i915_gem_execbuffer_relocate(struct drm_device *dev,
+ struct eb_objects *eb,
+ struct list_head *objects)
+{
+ struct drm_i915_gem_object *obj;
+ int ret;
+
+ list_for_each_entry(obj, objects, exec_list) {
+ ret = i915_gem_execbuffer_relocate_object(obj, eb);
+ if (ret)
+ return ret;
+ }
+
+ return 0;
+}
+
+static int
+i915_gem_execbuffer_reserve(struct intel_ring_buffer *ring,
+ struct drm_file *file,
+ struct list_head *objects)
+{
+ struct drm_i915_gem_object *obj;
+ int ret, retry;
+ bool has_fenced_gpu_access = INTEL_INFO(ring->dev)->gen < 4;
+ struct list_head ordered_objects;
+
+ INIT_LIST_HEAD(&ordered_objects);
+ while (!list_empty(objects)) {
+ struct drm_i915_gem_exec_object2 *entry;
+ bool need_fence, need_mappable;
+
+ obj = list_first_entry(objects,
+ struct drm_i915_gem_object,
+ exec_list);
+ entry = obj->exec_entry;
+
+ need_fence =
+ has_fenced_gpu_access &&
+ entry->flags & EXEC_OBJECT_NEEDS_FENCE &&
+ obj->tiling_mode != I915_TILING_NONE;
+ need_mappable =
+ entry->relocation_count ? true : need_fence;
+
+ if (need_mappable)
+ list_move(&obj->exec_list, &ordered_objects);
+ else
+ list_move_tail(&obj->exec_list, &ordered_objects);
+
+ obj->base.pending_read_domains = 0;
+ obj->base.pending_write_domain = 0;
+ }
+ list_splice(&ordered_objects, objects);
+
+ /* Attempt to pin all of the buffers into the GTT.
+ * This is done in 3 phases:
+ *
+ * 1a. Unbind all objects that do not match the GTT constraints for
+ * the execbuffer (fenceable, mappable, alignment etc).
+ * 1b. Increment pin count for already bound objects.
+ * 2. Bind new objects.
+ * 3. Decrement pin count.
+ *
+ * This avoid unnecessary unbinding of later objects in order to makr
+ * room for the earlier objects *unless* we need to defragment.
+ */
+ retry = 0;
+ do {
+ ret = 0;
+
+ /* Unbind any ill-fitting objects or pin. */
+ list_for_each_entry(obj, objects, exec_list) {
+ struct drm_i915_gem_exec_object2 *entry = obj->exec_entry;
+ bool need_fence, need_mappable;
+ if (!obj->gtt_space)
+ continue;
+
+ need_fence =
+ has_fenced_gpu_access &&
+ entry->flags & EXEC_OBJECT_NEEDS_FENCE &&
+ obj->tiling_mode != I915_TILING_NONE;
+ need_mappable =
+ entry->relocation_count ? true : need_fence;
+
+ if ((entry->alignment && obj->gtt_offset & (entry->alignment - 1)) ||
+ (need_mappable && !obj->map_and_fenceable))
+ ret = i915_gem_object_unbind(obj);
+ else
+ ret = i915_gem_object_pin(obj,
+ entry->alignment,
+ need_mappable);
+ if (ret)
+ goto err;
+
+ entry++;
+ }
+
+ /* Bind fresh objects */
+ list_for_each_entry(obj, objects, exec_list) {
+ struct drm_i915_gem_exec_object2 *entry = obj->exec_entry;
+ bool need_fence;
+
+ need_fence =
+ has_fenced_gpu_access &&
+ entry->flags & EXEC_OBJECT_NEEDS_FENCE &&
+ obj->tiling_mode != I915_TILING_NONE;
+
+ if (!obj->gtt_space) {
+ bool need_mappable =
+ entry->relocation_count ? true : need_fence;
+
+ ret = i915_gem_object_pin(obj,
+ entry->alignment,
+ need_mappable);
+ if (ret)
+ break;
+ }
+
+ if (has_fenced_gpu_access) {
+ if (need_fence) {
+ ret = i915_gem_object_get_fence(obj, ring, 1);
+ if (ret)
+ break;
+ } else if (entry->flags & EXEC_OBJECT_NEEDS_FENCE &&
+ obj->tiling_mode == I915_TILING_NONE) {
+ /* XXX pipelined! */
+ ret = i915_gem_object_put_fence(obj);
+ if (ret)
+ break;
+ }
+ obj->pending_fenced_gpu_access = need_fence;
+ }
+
+ entry->offset = obj->gtt_offset;
+ }
+
+ /* Decrement pin count for bound objects */
+ list_for_each_entry(obj, objects, exec_list) {
+ if (obj->gtt_space)
+ i915_gem_object_unpin(obj);
+ }
+
+ if (ret != -ENOSPC || retry > 1)
+ return ret;
+
+ /* First attempt, just clear anything that is purgeable.
+ * Second attempt, clear the entire GTT.
+ */
+ ret = i915_gem_evict_everything(ring->dev, retry == 0);
+ if (ret)
+ return ret;
+
+ retry++;
+ } while (1);
+
+err:
+ obj = list_entry(obj->exec_list.prev,
+ struct drm_i915_gem_object,
+ exec_list);
+ while (objects != &obj->exec_list) {
+ if (obj->gtt_space)
+ i915_gem_object_unpin(obj);
+
+ obj = list_entry(obj->exec_list.prev,
+ struct drm_i915_gem_object,
+ exec_list);
+ }
+
+ return ret;
+}
+
+static int
+i915_gem_execbuffer_relocate_slow(struct drm_device *dev,
+ struct drm_file *file,
+ struct intel_ring_buffer *ring,
+ struct list_head *objects,
+ struct eb_objects *eb,
+ struct drm_i915_gem_exec_object2 *exec,
+ int count)
+{
+ struct drm_i915_gem_relocation_entry *reloc;
+ struct drm_i915_gem_object *obj;
+ int *reloc_offset;
+ int i, total, ret;
+
+ /* We may process another execbuffer during the unlock... */
+ while (!list_empty(objects)) {
+ obj = list_first_entry(objects,
+ struct drm_i915_gem_object,
+ exec_list);
+ list_del_init(&obj->exec_list);
+ drm_gem_object_unreference(&obj->base);
+ }
+
+ mutex_unlock(&dev->struct_mutex);
+
+ total = 0;
+ for (i = 0; i < count; i++)
+ total += exec[i].relocation_count;
+
+ reloc_offset = drm_malloc_ab(count, sizeof(*reloc_offset));
+ reloc = drm_malloc_ab(total, sizeof(*reloc));
+ if (reloc == NULL || reloc_offset == NULL) {
+ drm_free_large(reloc);
+ drm_free_large(reloc_offset);
+ mutex_lock(&dev->struct_mutex);
+ return -ENOMEM;
+ }
+
+ total = 0;
+ for (i = 0; i < count; i++) {
+ struct drm_i915_gem_relocation_entry __user *user_relocs;
+
+ user_relocs = (void __user *)(uintptr_t)exec[i].relocs_ptr;
+
+ if (copy_from_user(reloc+total, user_relocs,
+ exec[i].relocation_count * sizeof(*reloc))) {
+ ret = -EFAULT;
+ mutex_lock(&dev->struct_mutex);
+ goto err;
+ }
+
+ reloc_offset[i] = total;
+ total += exec[i].relocation_count;
+ }
+
+ ret = i915_mutex_lock_interruptible(dev);
+ if (ret) {
+ mutex_lock(&dev->struct_mutex);
+ goto err;
+ }
+
+ /* reacquire the objects */
+ eb_reset(eb);
+ for (i = 0; i < count; i++) {
+ struct drm_i915_gem_object *obj;
+
+ obj = to_intel_bo(drm_gem_object_lookup(dev, file,
+ exec[i].handle));
+ if (obj == NULL) {
+ DRM_ERROR("Invalid object handle %d at index %d\n",
+ exec[i].handle, i);
+ ret = -ENOENT;
+ goto err;
+ }
+
+ list_add_tail(&obj->exec_list, objects);
+ obj->exec_handle = exec[i].handle;
+ obj->exec_entry = &exec[i];
+ eb_add_object(eb, obj);
+ }
+
+ ret = i915_gem_execbuffer_reserve(ring, file, objects);
+ if (ret)
+ goto err;
+
+ list_for_each_entry(obj, objects, exec_list) {
+ int offset = obj->exec_entry - exec;
+ ret = i915_gem_execbuffer_relocate_object_slow(obj, eb,
+ reloc + reloc_offset[offset]);
+ if (ret)
+ goto err;
+ }
+
+ /* Leave the user relocations as are, this is the painfully slow path,
+ * and we want to avoid the complication of dropping the lock whilst
+ * having buffers reserved in the aperture and so causing spurious
+ * ENOSPC for random operations.
+ */
+
+err:
+ drm_free_large(reloc);
+ drm_free_large(reloc_offset);
+ return ret;
+}
+
+static int
+i915_gem_execbuffer_flush(struct drm_device *dev,
+ uint32_t invalidate_domains,
+ uint32_t flush_domains,
+ uint32_t flush_rings)
+{
+ drm_i915_private_t *dev_priv = dev->dev_private;
+ int i, ret;
+
+ if (flush_domains & I915_GEM_DOMAIN_CPU)
+ intel_gtt_chipset_flush();
+
+ if (flush_domains & I915_GEM_DOMAIN_GTT)
+ wmb();
+
+ if ((flush_domains | invalidate_domains) & I915_GEM_GPU_DOMAINS) {
+ for (i = 0; i < I915_NUM_RINGS; i++)
+ if (flush_rings & (1 << i)) {
+ ret = i915_gem_flush_ring(dev,
+ &dev_priv->ring[i],
+ invalidate_domains,
+ flush_domains);
+ if (ret)
+ return ret;
+ }
+ }
+
+ return 0;
+}
+
+static int
+i915_gem_execbuffer_sync_rings(struct drm_i915_gem_object *obj,
+ struct intel_ring_buffer *to)
+{
+ struct intel_ring_buffer *from = obj->ring;
+ u32 seqno;
+ int ret, idx;
+
+ if (from == NULL || to == from)
+ return 0;
+
+ /* XXX gpu semaphores are implicated in various hard hangs on SNB */
+ if (INTEL_INFO(obj->base.dev)->gen < 6 || !i915_semaphores)
+ return i915_gem_object_wait_rendering(obj, true);
+
+ idx = intel_ring_sync_index(from, to);
+
+ seqno = obj->last_rendering_seqno;
+ if (seqno <= from->sync_seqno[idx])
+ return 0;
+
+ if (seqno == from->outstanding_lazy_request) {
+ struct drm_i915_gem_request *request;
+
+ request = kzalloc(sizeof(*request), GFP_KERNEL);
+ if (request == NULL)
+ return -ENOMEM;
+
+ ret = i915_add_request(obj->base.dev, NULL, request, from);
+ if (ret) {
+ kfree(request);
+ return ret;
+ }
+
+ seqno = request->seqno;
+ }
+
+ from->sync_seqno[idx] = seqno;
+ return intel_ring_sync(to, from, seqno - 1);
+}
+
+static int
+i915_gem_execbuffer_move_to_gpu(struct intel_ring_buffer *ring,
+ struct list_head *objects)
+{
+ struct drm_i915_gem_object *obj;
+ struct change_domains cd;
+ int ret;
+
+ cd.invalidate_domains = 0;
+ cd.flush_domains = 0;
+ cd.flush_rings = 0;
+ list_for_each_entry(obj, objects, exec_list)
+ i915_gem_object_set_to_gpu_domain(obj, ring, &cd);
+
+ if (cd.invalidate_domains | cd.flush_domains) {
+#if WATCH_EXEC
+ DRM_INFO("%s: invalidate_domains %08x flush_domains %08x\n",
+ __func__,
+ cd.invalidate_domains,
+ cd.flush_domains);
+#endif
+ ret = i915_gem_execbuffer_flush(ring->dev,
+ cd.invalidate_domains,
+ cd.flush_domains,
+ cd.flush_rings);
+ if (ret)
+ return ret;
+ }
+
+ list_for_each_entry(obj, objects, exec_list) {
+ ret = i915_gem_execbuffer_sync_rings(obj, ring);
+ if (ret)
+ return ret;
+ }
+
+ return 0;
+}
+
+static bool
+i915_gem_check_execbuffer(struct drm_i915_gem_execbuffer2 *exec)
+{
+ return ((exec->batch_start_offset | exec->batch_len) & 0x7) == 0;
+}
+
+static int
+validate_exec_list(struct drm_i915_gem_exec_object2 *exec,
+ int count)
+{
+ int i;
+
+ for (i = 0; i < count; i++) {
+ char __user *ptr = (char __user *)(uintptr_t)exec[i].relocs_ptr;
+ int length; /* limited by fault_in_pages_readable() */
+
+ /* First check for malicious input causing overflow */
+ if (exec[i].relocation_count >
+ INT_MAX / sizeof(struct drm_i915_gem_relocation_entry))
+ return -EINVAL;
+
+ length = exec[i].relocation_count *
+ sizeof(struct drm_i915_gem_relocation_entry);
+ if (!access_ok(VERIFY_READ, ptr, length))
+ return -EFAULT;
+
+ /* we may also need to update the presumed offsets */
+ if (!access_ok(VERIFY_WRITE, ptr, length))
+ return -EFAULT;
+
+ if (fault_in_pages_readable(ptr, length))
+ return -EFAULT;
+ }
+
+ return 0;
+}
+
+static int
+i915_gem_execbuffer_wait_for_flips(struct intel_ring_buffer *ring,
+ struct list_head *objects)
+{
+ struct drm_i915_gem_object *obj;
+ int flips;
+
+ /* Check for any pending flips. As we only maintain a flip queue depth
+ * of 1, we can simply insert a WAIT for the next display flip prior
+ * to executing the batch and avoid stalling the CPU.
+ */
+ flips = 0;
+ list_for_each_entry(obj, objects, exec_list) {
+ if (obj->base.write_domain)
+ flips |= atomic_read(&obj->pending_flip);
+ }
+ if (flips) {
+ int plane, flip_mask, ret;
+
+ for (plane = 0; flips >> plane; plane++) {
+ if (((flips >> plane) & 1) == 0)
+ continue;
+
+ if (plane)
+ flip_mask = MI_WAIT_FOR_PLANE_B_FLIP;
+ else
+ flip_mask = MI_WAIT_FOR_PLANE_A_FLIP;
+
+ ret = intel_ring_begin(ring, 2);
+ if (ret)
+ return ret;
+
+ intel_ring_emit(ring, MI_WAIT_FOR_EVENT | flip_mask);
+ intel_ring_emit(ring, MI_NOOP);
+ intel_ring_advance(ring);
+ }
+ }
+
+ return 0;
+}
+
+static void
+i915_gem_execbuffer_move_to_active(struct list_head *objects,
+ struct intel_ring_buffer *ring,
+ u32 seqno)
+{
+ struct drm_i915_gem_object *obj;
+
+ list_for_each_entry(obj, objects, exec_list) {
+ obj->base.read_domains = obj->base.pending_read_domains;
+ obj->base.write_domain = obj->base.pending_write_domain;
+ obj->fenced_gpu_access = obj->pending_fenced_gpu_access;
+
+ i915_gem_object_move_to_active(obj, ring, seqno);
+ if (obj->base.write_domain) {
+ obj->dirty = 1;
+ obj->pending_gpu_write = true;
+ list_move_tail(&obj->gpu_write_list,
+ &ring->gpu_write_list);
+ intel_mark_busy(ring->dev, obj);
+ }
+
+ trace_i915_gem_object_change_domain(obj,
+ obj->base.read_domains,
+ obj->base.write_domain);
+ }
+}
+
+static void
+i915_gem_execbuffer_retire_commands(struct drm_device *dev,
+ struct drm_file *file,
+ struct intel_ring_buffer *ring)
+{
+ struct drm_i915_gem_request *request;
+ u32 invalidate;
+
+ /*
+ * Ensure that the commands in the batch buffer are
+ * finished before the interrupt fires.
+ *
+ * The sampler always gets flushed on i965 (sigh).
+ */
+ invalidate = I915_GEM_DOMAIN_COMMAND;
+ if (INTEL_INFO(dev)->gen >= 4)
+ invalidate |= I915_GEM_DOMAIN_SAMPLER;
+ if (ring->flush(ring, invalidate, 0)) {
+ i915_gem_next_request_seqno(dev, ring);
+ return;
+ }
+
+ /* Add a breadcrumb for the completion of the batch buffer */
+ request = kzalloc(sizeof(*request), GFP_KERNEL);
+ if (request == NULL || i915_add_request(dev, file, request, ring)) {
+ i915_gem_next_request_seqno(dev, ring);
+ kfree(request);
+ }
+}
+
+static int
+i915_gem_do_execbuffer(struct drm_device *dev, void *data,
+ struct drm_file *file,
+ struct drm_i915_gem_execbuffer2 *args,
+ struct drm_i915_gem_exec_object2 *exec)
+{
+ drm_i915_private_t *dev_priv = dev->dev_private;
+ struct list_head objects;
+ struct eb_objects *eb;
+ struct drm_i915_gem_object *batch_obj;
+ struct drm_clip_rect *cliprects = NULL;
+ struct intel_ring_buffer *ring;
+ u32 exec_start, exec_len;
+ u32 seqno;
+ int ret, mode, i;
+
+ if (!i915_gem_check_execbuffer(args)) {
+ DRM_ERROR("execbuf with invalid offset/length\n");
+ return -EINVAL;
+ }
+
+ ret = validate_exec_list(exec, args->buffer_count);
+ if (ret)
+ return ret;
+
+#if WATCH_EXEC
+ DRM_INFO("buffers_ptr %d buffer_count %d len %08x\n",
+ (int) args->buffers_ptr, args->buffer_count, args->batch_len);
+#endif
+ switch (args->flags & I915_EXEC_RING_MASK) {
+ case I915_EXEC_DEFAULT:
+ case I915_EXEC_RENDER:
+ ring = &dev_priv->ring[RCS];
+ break;
+ case I915_EXEC_BSD:
+ if (!HAS_BSD(dev)) {
+ DRM_ERROR("execbuf with invalid ring (BSD)\n");
+ return -EINVAL;
+ }
+ ring = &dev_priv->ring[VCS];
+ break;
+ case I915_EXEC_BLT:
+ if (!HAS_BLT(dev)) {
+ DRM_ERROR("execbuf with invalid ring (BLT)\n");
+ return -EINVAL;
+ }
+ ring = &dev_priv->ring[BCS];
+ break;
+ default:
+ DRM_ERROR("execbuf with unknown ring: %d\n",
+ (int)(args->flags & I915_EXEC_RING_MASK));
+ return -EINVAL;
+ }
+
+ mode = args->flags & I915_EXEC_CONSTANTS_MASK;
+ switch (mode) {
+ case I915_EXEC_CONSTANTS_REL_GENERAL:
+ case I915_EXEC_CONSTANTS_ABSOLUTE:
+ case I915_EXEC_CONSTANTS_REL_SURFACE:
+ if (ring == &dev_priv->ring[RCS] &&
+ mode != dev_priv->relative_constants_mode) {
+ if (INTEL_INFO(dev)->gen < 4)
+ return -EINVAL;
+
+ if (INTEL_INFO(dev)->gen > 5 &&
+ mode == I915_EXEC_CONSTANTS_REL_SURFACE)
+ return -EINVAL;
+
+ ret = intel_ring_begin(ring, 4);
+ if (ret)
+ return ret;
+
+ intel_ring_emit(ring, MI_NOOP);
+ intel_ring_emit(ring, MI_LOAD_REGISTER_IMM(1));
+ intel_ring_emit(ring, INSTPM);
+ intel_ring_emit(ring,
+ I915_EXEC_CONSTANTS_MASK << 16 | mode);
+ intel_ring_advance(ring);
+
+ dev_priv->relative_constants_mode = mode;
+ }
+ break;
+ default:
+ DRM_ERROR("execbuf with unknown constants: %d\n", mode);
+ return -EINVAL;
+ }
+
+ if (args->buffer_count < 1) {
+ DRM_ERROR("execbuf with %d buffers\n", args->buffer_count);
+ return -EINVAL;
+ }
+
+ if (args->num_cliprects != 0) {
+ if (ring != &dev_priv->ring[RCS]) {
+ DRM_ERROR("clip rectangles are only valid with the render ring\n");
+ return -EINVAL;
+ }
+
+ cliprects = kmalloc(args->num_cliprects * sizeof(*cliprects),
+ GFP_KERNEL);
+ if (cliprects == NULL) {
+ ret = -ENOMEM;
+ goto pre_mutex_err;
+ }
+
+ if (copy_from_user(cliprects,
+ (struct drm_clip_rect __user *)(uintptr_t)
+ args->cliprects_ptr,
+ sizeof(*cliprects)*args->num_cliprects)) {
+ ret = -EFAULT;
+ goto pre_mutex_err;
+ }
+ }
+
+ ret = i915_mutex_lock_interruptible(dev);
+ if (ret)
+ goto pre_mutex_err;
+
+ if (dev_priv->mm.suspended) {
+ mutex_unlock(&dev->struct_mutex);
+ ret = -EBUSY;
+ goto pre_mutex_err;
+ }
+
+ eb = eb_create(args->buffer_count);
+ if (eb == NULL) {
+ mutex_unlock(&dev->struct_mutex);
+ ret = -ENOMEM;
+ goto pre_mutex_err;
+ }
+
+ /* Look up object handles */
+ INIT_LIST_HEAD(&objects);
+ for (i = 0; i < args->buffer_count; i++) {
+ struct drm_i915_gem_object *obj;
+
+ obj = to_intel_bo(drm_gem_object_lookup(dev, file,
+ exec[i].handle));
+ if (obj == NULL) {
+ DRM_ERROR("Invalid object handle %d at index %d\n",
+ exec[i].handle, i);
+ /* prevent error path from reading uninitialized data */
+ ret = -ENOENT;
+ goto err;
+ }
+
+ if (!list_empty(&obj->exec_list)) {
+ DRM_ERROR("Object %p [handle %d, index %d] appears more than once in object list\n",
+ obj, exec[i].handle, i);
+ ret = -EINVAL;
+ goto err;
+ }
+
+ list_add_tail(&obj->exec_list, &objects);
+ obj->exec_handle = exec[i].handle;
+ obj->exec_entry = &exec[i];
+ eb_add_object(eb, obj);
+ }
+
+ /* take note of the batch buffer before we might reorder the lists */
+ batch_obj = list_entry(objects.prev,
+ struct drm_i915_gem_object,
+ exec_list);
+
+ /* Move the objects en-masse into the GTT, evicting if necessary. */
+ ret = i915_gem_execbuffer_reserve(ring, file, &objects);
+ if (ret)
+ goto err;
+
+ /* The objects are in their final locations, apply the relocations. */
+ ret = i915_gem_execbuffer_relocate(dev, eb, &objects);
+ if (ret) {
+ if (ret == -EFAULT) {
+ ret = i915_gem_execbuffer_relocate_slow(dev, file, ring,
+ &objects, eb,
+ exec,
+ args->buffer_count);
+ BUG_ON(!mutex_is_locked(&dev->struct_mutex));
+ }
+ if (ret)
+ goto err;
+ }
+
+ /* Set the pending read domains for the batch buffer to COMMAND */
+ if (batch_obj->base.pending_write_domain) {
+ DRM_ERROR("Attempting to use self-modifying batch buffer\n");
+ ret = -EINVAL;
+ goto err;
+ }
+ batch_obj->base.pending_read_domains |= I915_GEM_DOMAIN_COMMAND;
+
+ ret = i915_gem_execbuffer_move_to_gpu(ring, &objects);
+ if (ret)
+ goto err;
+
+ ret = i915_gem_execbuffer_wait_for_flips(ring, &objects);
+ if (ret)
+ goto err;
+
+ seqno = i915_gem_next_request_seqno(dev, ring);
+ for (i = 0; i < ARRAY_SIZE(ring->sync_seqno); i++) {
+ if (seqno < ring->sync_seqno[i]) {
+ /* The GPU can not handle its semaphore value wrapping,
+ * so every billion or so execbuffers, we need to stall
+ * the GPU in order to reset the counters.
+ */
+ ret = i915_gpu_idle(dev);
+ if (ret)
+ goto err;
+
+ BUG_ON(ring->sync_seqno[i]);
+ }
+ }
+
+ exec_start = batch_obj->gtt_offset + args->batch_start_offset;
+ exec_len = args->batch_len;
+ if (cliprects) {
+ for (i = 0; i < args->num_cliprects; i++) {
+ ret = i915_emit_box(dev, &cliprects[i],
+ args->DR1, args->DR4);
+ if (ret)
+ goto err;
+
+ ret = ring->dispatch_execbuffer(ring,
+ exec_start, exec_len);
+ if (ret)
+ goto err;
+ }
+ } else {
+ ret = ring->dispatch_execbuffer(ring, exec_start, exec_len);
+ if (ret)
+ goto err;
+ }
+
+ i915_gem_execbuffer_move_to_active(&objects, ring, seqno);
+ i915_gem_execbuffer_retire_commands(dev, file, ring);
+
+err:
+ eb_destroy(eb);
+ while (!list_empty(&objects)) {
+ struct drm_i915_gem_object *obj;
+
+ obj = list_first_entry(&objects,
+ struct drm_i915_gem_object,
+ exec_list);
+ list_del_init(&obj->exec_list);
+ drm_gem_object_unreference(&obj->base);
+ }
+
+ mutex_unlock(&dev->struct_mutex);
+
+pre_mutex_err:
+ kfree(cliprects);
+ return ret;
+}
+
+/*
+ * Legacy execbuffer just creates an exec2 list from the original exec object
+ * list array and passes it to the real function.
+ */
+int
+i915_gem_execbuffer(struct drm_device *dev, void *data,
+ struct drm_file *file)
+{
+ struct drm_i915_gem_execbuffer *args = data;
+ struct drm_i915_gem_execbuffer2 exec2;
+ struct drm_i915_gem_exec_object *exec_list = NULL;
+ struct drm_i915_gem_exec_object2 *exec2_list = NULL;
+ int ret, i;
+
+#if WATCH_EXEC
+ DRM_INFO("buffers_ptr %d buffer_count %d len %08x\n",
+ (int) args->buffers_ptr, args->buffer_count, args->batch_len);
+#endif
+
+ if (args->buffer_count < 1) {
+ DRM_ERROR("execbuf with %d buffers\n", args->buffer_count);
+ return -EINVAL;
+ }
+
+ /* Copy in the exec list from userland */
+ exec_list = drm_malloc_ab(sizeof(*exec_list), args->buffer_count);
+ exec2_list = drm_malloc_ab(sizeof(*exec2_list), args->buffer_count);
+ if (exec_list == NULL || exec2_list == NULL) {
+ DRM_ERROR("Failed to allocate exec list for %d buffers\n",
+ args->buffer_count);
+ drm_free_large(exec_list);
+ drm_free_large(exec2_list);
+ return -ENOMEM;
+ }
+ ret = copy_from_user(exec_list,
+ (struct drm_i915_relocation_entry __user *)
+ (uintptr_t) args->buffers_ptr,
+ sizeof(*exec_list) * args->buffer_count);
+ if (ret != 0) {
+ DRM_ERROR("copy %d exec entries failed %d\n",
+ args->buffer_count, ret);
+ drm_free_large(exec_list);
+ drm_free_large(exec2_list);
+ return -EFAULT;
+ }
+
+ for (i = 0; i < args->buffer_count; i++) {
+ exec2_list[i].handle = exec_list[i].handle;
+ exec2_list[i].relocation_count = exec_list[i].relocation_count;
+ exec2_list[i].relocs_ptr = exec_list[i].relocs_ptr;
+ exec2_list[i].alignment = exec_list[i].alignment;
+ exec2_list[i].offset = exec_list[i].offset;
+ if (INTEL_INFO(dev)->gen < 4)
+ exec2_list[i].flags = EXEC_OBJECT_NEEDS_FENCE;
+ else
+ exec2_list[i].flags = 0;
+ }
+
+ exec2.buffers_ptr = args->buffers_ptr;
+ exec2.buffer_count = args->buffer_count;
+ exec2.batch_start_offset = args->batch_start_offset;
+ exec2.batch_len = args->batch_len;
+ exec2.DR1 = args->DR1;
+ exec2.DR4 = args->DR4;
+ exec2.num_cliprects = args->num_cliprects;
+ exec2.cliprects_ptr = args->cliprects_ptr;
+ exec2.flags = I915_EXEC_RENDER;
+
+ ret = i915_gem_do_execbuffer(dev, data, file, &exec2, exec2_list);
+ if (!ret) {
+ /* Copy the new buffer offsets back to the user's exec list. */
+ for (i = 0; i < args->buffer_count; i++)
+ exec_list[i].offset = exec2_list[i].offset;
+ /* ... and back out to userspace */
+ ret = copy_to_user((struct drm_i915_relocation_entry __user *)
+ (uintptr_t) args->buffers_ptr,
+ exec_list,
+ sizeof(*exec_list) * args->buffer_count);
+ if (ret) {
+ ret = -EFAULT;
+ DRM_ERROR("failed to copy %d exec entries "
+ "back to user (%d)\n",
+ args->buffer_count, ret);
+ }
+ }
+
+ drm_free_large(exec_list);
+ drm_free_large(exec2_list);
+ return ret;
+}
+
+int
+i915_gem_execbuffer2(struct drm_device *dev, void *data,
+ struct drm_file *file)
+{
+ struct drm_i915_gem_execbuffer2 *args = data;
+ struct drm_i915_gem_exec_object2 *exec2_list = NULL;
+ int ret;
+
+#if WATCH_EXEC
+ DRM_INFO("buffers_ptr %d buffer_count %d len %08x\n",
+ (int) args->buffers_ptr, args->buffer_count, args->batch_len);
+#endif
+
+ if (args->buffer_count < 1) {
+ DRM_ERROR("execbuf2 with %d buffers\n", args->buffer_count);
+ return -EINVAL;
+ }
+
+ exec2_list = drm_malloc_ab(sizeof(*exec2_list), args->buffer_count);
+ if (exec2_list == NULL) {
+ DRM_ERROR("Failed to allocate exec list for %d buffers\n",
+ args->buffer_count);
+ return -ENOMEM;
+ }
+ ret = copy_from_user(exec2_list,
+ (struct drm_i915_relocation_entry __user *)
+ (uintptr_t) args->buffers_ptr,
+ sizeof(*exec2_list) * args->buffer_count);
+ if (ret != 0) {
+ DRM_ERROR("copy %d exec entries failed %d\n",
+ args->buffer_count, ret);
+ drm_free_large(exec2_list);
+ return -EFAULT;
+ }
+
+ ret = i915_gem_do_execbuffer(dev, data, file, args, exec2_list);
+ if (!ret) {
+ /* Copy the new buffer offsets back to the user's exec list. */
+ ret = copy_to_user((struct drm_i915_relocation_entry __user *)
+ (uintptr_t) args->buffers_ptr,
+ exec2_list,
+ sizeof(*exec2_list) * args->buffer_count);
+ if (ret) {
+ ret = -EFAULT;
+ DRM_ERROR("failed to copy %d exec entries "
+ "back to user (%d)\n",
+ args->buffer_count, ret);
+ }
+ }
+
+ drm_free_large(exec2_list);
+ return ret;
+}
projects / mv-sheeva.git / blobdiff