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drm/i915/gem: Try allocating va from free space 

If the current node/entry location is occupied, and the object is not
pinned, try assigning it some free space. We cannot wait here, so if in
doubt, we unreserve and try to grab all at once.

v2: Use the final pin_flags so that we won't have to move the object if
we find the wrong free space.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Matthew Auld <matthew.auld@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200401194135.5442-1-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson 2020-04-01 20:41:35 +01:00
parent 0d961c4610
commit 8a338f4bf6
1 changed files with 43 additions and 25 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

68
drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
View File

@ -429,6 +429,32 @@ eb_vma_misplaced(const struct drm_i915_gem_exec_object2 *entry,
return false;
}
static u64 eb_pin_flags(const struct drm_i915_gem_exec_object2 *entry,
unsigned int exec_flags)
{
u64 pin_flags = 0;
if (exec_flags & EXEC_OBJECT_NEEDS_GTT)
pin_flags |= PIN_GLOBAL;
/*
* Wa32bitGeneralStateOffset & Wa32bitInstructionBaseOffset,
* limit address to the first 4GBs for unflagged objects.
*/
if (!(exec_flags & EXEC_OBJECT_SUPPORTS_48B_ADDRESS))
pin_flags |= PIN_ZONE_4G;
if (exec_flags & __EXEC_OBJECT_NEEDS_MAP)
pin_flags |= PIN_MAPPABLE;
if (exec_flags & EXEC_OBJECT_PINNED)
pin_flags |= entry->offset | PIN_OFFSET_FIXED;
else if (exec_flags & __EXEC_OBJECT_NEEDS_BIAS)
pin_flags |= BATCH_OFFSET_BIAS | PIN_OFFSET_BIAS;
return pin_flags;
}
static inline bool
eb_pin_vma(struct i915_execbuffer *eb,
const struct drm_i915_gem_exec_object2 *entry,
@ -446,8 +472,19 @@ eb_pin_vma(struct i915_execbuffer *eb,
if (unlikely(ev->flags & EXEC_OBJECT_NEEDS_GTT))
pin_flags |= PIN_GLOBAL;
if (unlikely(i915_vma_pin(vma, 0, 0, pin_flags)))
return false;
/* Attempt to reuse the current location if available */
if (unlikely(i915_vma_pin(vma, 0, 0, pin_flags))) {
if (entry->flags & EXEC_OBJECT_PINNED)
return false;
/* Failing that pick any _free_ space if suitable */
if (unlikely(i915_vma_pin(vma,
entry->pad_to_size,
entry->alignment,
eb_pin_flags(entry, ev->flags) |
PIN_USER | PIN_NOEVICT)))
return false;
}
if (unlikely(ev->flags & EXEC_OBJECT_NEEDS_FENCE)) {
if (unlikely(i915_vma_pin_fence(vma))) {
@ -588,28 +625,9 @@ static int eb_reserve_vma(const struct i915_execbuffer *eb,
u64 pin_flags)
{
struct drm_i915_gem_exec_object2 *entry = ev->exec;
unsigned int exec_flags = ev->flags;
struct i915_vma *vma = ev->vma;
int err;
if (exec_flags & EXEC_OBJECT_NEEDS_GTT)
pin_flags |= PIN_GLOBAL;
/*
* Wa32bitGeneralStateOffset & Wa32bitInstructionBaseOffset,
* limit address to the first 4GBs for unflagged objects.
*/
if (!(exec_flags & EXEC_OBJECT_SUPPORTS_48B_ADDRESS))
pin_flags |= PIN_ZONE_4G;
if (exec_flags & __EXEC_OBJECT_NEEDS_MAP)
pin_flags |= PIN_MAPPABLE;
if (exec_flags & EXEC_OBJECT_PINNED)
pin_flags |= entry->offset | PIN_OFFSET_FIXED;
else if (exec_flags & __EXEC_OBJECT_NEEDS_BIAS)
pin_flags |= BATCH_OFFSET_BIAS | PIN_OFFSET_BIAS;
if (drm_mm_node_allocated(&vma->node) &&
eb_vma_misplaced(entry, vma, ev->flags)) {
err = i915_vma_unbind(vma);
@ -619,7 +637,7 @@ static int eb_reserve_vma(const struct i915_execbuffer *eb,
err = i915_vma_pin(vma,
entry->pad_to_size, entry->alignment,
pin_flags);
eb_pin_flags(entry, ev->flags) | pin_flags);
if (err)
return err;
@ -628,7 +646,7 @@ static int eb_reserve_vma(const struct i915_execbuffer *eb,
eb->args->flags |= __EXEC_HAS_RELOC;
}
if (unlikely(exec_flags & EXEC_OBJECT_NEEDS_FENCE)) {
if (unlikely(ev->flags & EXEC_OBJECT_NEEDS_FENCE)) {
err = i915_vma_pin_fence(vma);
if (unlikely(err)) {
i915_vma_unpin(vma);
@ -636,10 +654,10 @@ static int eb_reserve_vma(const struct i915_execbuffer *eb,
}
if (vma->fence)
exec_flags |= __EXEC_OBJECT_HAS_FENCE;
ev->flags |= __EXEC_OBJECT_HAS_FENCE;
}
ev->flags = exec_flags | __EXEC_OBJECT_HAS_PIN;
ev->flags |= __EXEC_OBJECT_HAS_PIN;
GEM_BUG_ON(eb_vma_misplaced(entry, vma, ev->flags));
return 0;