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path: root/drivers/gpu/drm/i915/i915_gem_evict.c
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Diffstat (limited to 'drivers/gpu/drm/i915/i915_gem_evict.c')
-rw-r--r--drivers/gpu/drm/i915/i915_gem_evict.c172
1 files changed, 129 insertions, 43 deletions
diff --git a/drivers/gpu/drm/i915/i915_gem_evict.c b/drivers/gpu/drm/i915/i915_gem_evict.c
index d534a316a16e..c181b1bb3d2c 100644
--- a/drivers/gpu/drm/i915/i915_gem_evict.c
+++ b/drivers/gpu/drm/i915/i915_gem_evict.c
@@ -51,7 +51,10 @@ static bool ggtt_is_idle(struct drm_i915_private *dev_priv)
}
static bool
-mark_free(struct i915_vma *vma, unsigned int flags, struct list_head *unwind)
+mark_free(struct drm_mm_scan *scan,
+ struct i915_vma *vma,
+ unsigned int flags,
+ struct list_head *unwind)
{
if (i915_vma_is_pinned(vma))
return false;
@@ -63,7 +66,7 @@ mark_free(struct i915_vma *vma, unsigned int flags, struct list_head *unwind)
return false;
list_add(&vma->exec_list, unwind);
- return drm_mm_scan_add_block(&vma->node);
+ return drm_mm_scan_add_block(scan, &vma->node);
}
/**
@@ -96,7 +99,8 @@ i915_gem_evict_something(struct i915_address_space *vm,
u64 start, u64 end,
unsigned flags)
{
- struct drm_i915_private *dev_priv = to_i915(vm->dev);
+ struct drm_i915_private *dev_priv = vm->i915;
+ struct drm_mm_scan scan;
struct list_head eviction_list;
struct list_head *phases[] = {
&vm->inactive_list,
@@ -104,9 +108,11 @@ i915_gem_evict_something(struct i915_address_space *vm,
NULL,
}, **phase;
struct i915_vma *vma, *next;
+ struct drm_mm_node *node;
+ enum drm_mm_insert_mode mode;
int ret;
- lockdep_assert_held(&vm->dev->struct_mutex);
+ lockdep_assert_held(&vm->i915->drm.struct_mutex);
trace_i915_gem_evict(vm, min_size, alignment, flags);
/*
@@ -122,14 +128,23 @@ i915_gem_evict_something(struct i915_address_space *vm,
* On each list, the oldest objects lie at the HEAD with the freshest
* object on the TAIL.
*/
- if (start != 0 || end != vm->total) {
- drm_mm_init_scan_with_range(&vm->mm, min_size,
- alignment, cache_level,
- start, end);
- } else
- drm_mm_init_scan(&vm->mm, min_size, alignment, cache_level);
-
- if (flags & PIN_NONBLOCK)
+ mode = DRM_MM_INSERT_BEST;
+ if (flags & PIN_HIGH)
+ mode = DRM_MM_INSERT_HIGH;
+ if (flags & PIN_MAPPABLE)
+ mode = DRM_MM_INSERT_LOW;
+ drm_mm_scan_init_with_range(&scan, &vm->mm,
+ min_size, alignment, cache_level,
+ start, end, mode);
+
+ /* Retire before we search the active list. Although we have
+ * reasonable accuracy in our retirement lists, we may have
+ * a stray pin (preventing eviction) that can only be resolved by
+ * retiring.
+ */
+ if (!(flags & PIN_NONBLOCK))
+ i915_gem_retire_requests(dev_priv);
+ else
phases[1] = NULL;
search_again:
@@ -137,13 +152,13 @@ search_again:
phase = phases;
do {
list_for_each_entry(vma, *phase, vm_link)
- if (mark_free(vma, flags, &eviction_list))
+ if (mark_free(&scan, vma, flags, &eviction_list))
goto found;
} while (*++phase);
/* Nothing found, clean up and bail out! */
list_for_each_entry_safe(vma, next, &eviction_list, exec_list) {
- ret = drm_mm_scan_remove_block(&vma->node);
+ ret = drm_mm_scan_remove_block(&scan, &vma->node);
BUG_ON(ret);
INIT_LIST_HEAD(&vma->exec_list);
@@ -162,7 +177,7 @@ search_again:
* back to userspace to give our workqueues time to
* acquire our locks and unpin the old scanouts.
*/
- return intel_has_pending_fb_unpin(vm->dev) ? -EAGAIN : -ENOSPC;
+ return intel_has_pending_fb_unpin(dev_priv) ? -EAGAIN : -ENOSPC;
}
/* Not everything in the GGTT is tracked via vma (otherwise we
@@ -192,7 +207,7 @@ found:
* of any of our objects, thus corrupting the list).
*/
list_for_each_entry_safe(vma, next, &eviction_list, exec_list) {
- if (drm_mm_scan_remove_block(&vma->node))
+ if (drm_mm_scan_remove_block(&scan, &vma->node))
__i915_vma_pin(vma);
else
list_del_init(&vma->exec_list);
@@ -210,48 +225,119 @@ found:
if (ret == 0)
ret = i915_vma_unbind(vma);
}
+
+ while (ret == 0 && (node = drm_mm_scan_color_evict(&scan))) {
+ vma = container_of(node, struct i915_vma, node);
+ ret = i915_vma_unbind(vma);
+ }
+
return ret;
}
-int
-i915_gem_evict_for_vma(struct i915_vma *target)
+/**
+ * i915_gem_evict_for_vma - Evict vmas to make room for binding a new one
+ * @vm: address space to evict from
+ * @target: range (and color) to evict for
+ * @flags: additional flags to control the eviction algorithm
+ *
+ * This function will try to evict vmas that overlap the target node.
+ *
+ * To clarify: This is for freeing up virtual address space, not for freeing
+ * memory in e.g. the shrinker.
+ */
+int i915_gem_evict_for_node(struct i915_address_space *vm,
+ struct drm_mm_node *target,
+ unsigned int flags)
{
- struct drm_mm_node *node, *next;
+ LIST_HEAD(eviction_list);
+ struct drm_mm_node *node;
+ u64 start = target->start;
+ u64 end = start + target->size;
+ struct i915_vma *vma, *next;
+ bool check_color;
+ int ret = 0;
- lockdep_assert_held(&target->vm->dev->struct_mutex);
+ lockdep_assert_held(&vm->i915->drm.struct_mutex);
+ trace_i915_gem_evict_node(vm, target, flags);
- list_for_each_entry_safe(node, next,
- &target->vm->mm.head_node.node_list,
- node_list) {
- struct i915_vma *vma;
- int ret;
+ /* Retire before we search the active list. Although we have
+ * reasonable accuracy in our retirement lists, we may have
+ * a stray pin (preventing eviction) that can only be resolved by
+ * retiring.
+ */
+ if (!(flags & PIN_NONBLOCK))
+ i915_gem_retire_requests(vm->i915);
+
+ check_color = vm->mm.color_adjust;
+ if (check_color) {
+ /* Expand search to cover neighbouring guard pages (or lack!) */
+ if (start > vm->start)
+ start -= I915_GTT_PAGE_SIZE;
+ if (end < vm->start + vm->total)
+ end += I915_GTT_PAGE_SIZE;
+ }
- if (node->start + node->size <= target->node.start)
- continue;
- if (node->start >= target->node.start + target->node.size)
+ drm_mm_for_each_node_in_range(node, &vm->mm, start, end) {
+ /* If we find any non-objects (!vma), we cannot evict them */
+ if (node->color == I915_COLOR_UNEVICTABLE) {
+ ret = -ENOSPC;
break;
+ }
vma = container_of(node, typeof(*vma), node);
- if (i915_vma_is_pinned(vma)) {
- if (!vma->exec_entry || i915_vma_pin_count(vma) > 1)
- /* Object is pinned for some other use */
- return -EBUSY;
+ /* If we are using coloring to insert guard pages between
+ * different cache domains within the address space, we have
+ * to check whether the objects on either side of our range
+ * abutt and conflict. If they are in conflict, then we evict
+ * those as well to make room for our guard pages.
+ */
+ if (check_color) {
+ if (vma->node.start + vma->node.size == node->start) {
+ if (vma->node.color == node->color)
+ continue;
+ }
+ if (vma->node.start == node->start + node->size) {
+ if (vma->node.color == node->color)
+ continue;
+ }
+ }
- /* We need to evict a buffer in the same batch */
- if (vma->exec_entry->flags & EXEC_OBJECT_PINNED)
- /* Overlapping fixed objects in the same batch */
- return -EINVAL;
+ if (flags & PIN_NONBLOCK &&
+ (i915_vma_is_pinned(vma) || i915_vma_is_active(vma))) {
+ ret = -ENOSPC;
+ break;
+ }
- return -ENOSPC;
+ /* Overlap of objects in the same batch? */
+ if (i915_vma_is_pinned(vma) || !list_empty(&vma->exec_list)) {
+ ret = -ENOSPC;
+ if (vma->exec_entry &&
+ vma->exec_entry->flags & EXEC_OBJECT_PINNED)
+ ret = -EINVAL;
+ break;
}
- ret = i915_vma_unbind(vma);
- if (ret)
- return ret;
+ /* Never show fear in the face of dragons!
+ *
+ * We cannot directly remove this node from within this
+ * iterator and as with i915_gem_evict_something() we employ
+ * the vma pin_count in order to prevent the action of
+ * unbinding one vma from freeing (by dropping its active
+ * reference) another in our eviction list.
+ */
+ __i915_vma_pin(vma);
+ list_add(&vma->exec_list, &eviction_list);
}
- return 0;
+ list_for_each_entry_safe(vma, next, &eviction_list, exec_list) {
+ list_del_init(&vma->exec_list);
+ __i915_vma_unpin(vma);
+ if (ret == 0)
+ ret = i915_vma_unbind(vma);
+ }
+
+ return ret;
}
/**
@@ -273,11 +359,11 @@ int i915_gem_evict_vm(struct i915_address_space *vm, bool do_idle)
struct i915_vma *vma, *next;
int ret;
- lockdep_assert_held(&vm->dev->struct_mutex);
+ lockdep_assert_held(&vm->i915->drm.struct_mutex);
trace_i915_gem_evict_vm(vm);
if (do_idle) {
- struct drm_i915_private *dev_priv = to_i915(vm->dev);
+ struct drm_i915_private *dev_priv = vm->i915;
if (i915_is_ggtt(vm)) {
ret = i915_gem_switch_to_kernel_context(dev_priv);