Remove the stub i915_vma_pin() used for incrementally pining objects for
execbuf (under the severe restriction that they must not wait on a
resource as we may have already pinned it) and replace it with a
i915_vma_pin_inplace() that is only allowed to reclaim the currently
bound location for the vma (and will never wait for a pinned resource).
Signed-off-by: Chris Wilson <ch...@chris-wilson.co.uk>
---
.../gpu/drm/i915/gem/i915_gem_execbuffer.c | 69 +++++++++++--------
drivers/gpu/drm/i915/i915_vma.c | 6 +-
drivers/gpu/drm/i915/i915_vma.h | 2 +
3 files changed, 45 insertions(+), 32 deletions(-)
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
index 35a57c1fc9c3..1015c4fd9f3e 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
@@ -452,49 +452,55 @@ static u64 eb_pin_flags(const struct
drm_i915_gem_exec_object2 *entry,
return pin_flags;
}
+static bool eb_pin_vma_fence_inplace(struct eb_vma *ev)
+{
+ struct i915_vma *vma = ev->vma;
+ struct i915_fence_reg *reg = vma->fence;
+
+ if (reg) {
+ if (READ_ONCE(reg->dirty))
+ return false;
+
+ atomic_inc(®->pin_count);
+ ev->flags |= __EXEC_OBJECT_HAS_FENCE;
+ } else {
+ if (i915_gem_object_is_tiled(vma->obj))
+ return false;
+ }
+
+ return true;
+}
+
static inline bool
-eb_pin_vma(struct i915_execbuffer *eb,
- const struct drm_i915_gem_exec_object2 *entry,
- struct eb_vma *ev)
+eb_pin_vma_inplace(struct i915_execbuffer *eb,
+ const struct drm_i915_gem_exec_object2 *entry,
+ struct eb_vma *ev)
{
struct i915_vma *vma = ev->vma;
- u64 pin_flags;
+ unsigned int pin_flags;
- if (vma->node.size)
- pin_flags = vma->node.start;
- else
- pin_flags = entry->offset & PIN_OFFSET_MASK;
+ if (eb_vma_misplaced(entry, vma, ev->flags))
+ return false;
- pin_flags |= PIN_USER | PIN_NOEVICT | PIN_OFFSET_FIXED;
+ pin_flags = PIN_USER;
if (unlikely(ev->flags & EXEC_OBJECT_NEEDS_GTT))
pin_flags |= PIN_GLOBAL;
/* 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 (!i915_vma_pin_inplace(vma, pin_flags))
+ return false;
if (unlikely(ev->flags & EXEC_OBJECT_NEEDS_FENCE)) {
- if (unlikely(i915_vma_pin_fence(vma))) {
- i915_vma_unpin(vma);
+ if (!eb_pin_vma_fence_inplace(ev)) {
+ __i915_vma_unpin(vma);
return false;
}
-
- if (vma->fence)
- ev->flags |= __EXEC_OBJECT_HAS_FENCE;
}
+ GEM_BUG_ON(eb_vma_misplaced(entry, vma, ev->flags));
+
ev->flags |= __EXEC_OBJECT_HAS_PIN;
- return !eb_vma_misplaced(entry, vma, ev->flags);
+ return true;
}
static int
@@ -676,14 +682,17 @@ static int eb_reserve_vm(struct i915_execbuffer *eb)
struct drm_i915_gem_exec_object2 *entry = ev->exec;
struct i915_vma *vma = ev->vma;
- if (eb_pin_vma(eb, entry, ev)) {
+ if (eb_pin_vma_inplace(eb, entry, ev)) {
if (entry->offset != vma->node.start) {
entry->offset = vma->node.start | UPDATE;
eb->args->flags |= __EXEC_HAS_RELOC;
}
} else {
- eb_unreserve_vma(ev);
- list_add_tail(&ev->unbound_link, &unbound);
+ /* Lightly sort user placed objects to the fore */
+ if (ev->flags & EXEC_OBJECT_PINNED)
+ list_add(&ev->unbound_link, &unbound);
+ else
+ list_add_tail(&ev->unbound_link, &unbound);
}
}
diff --git a/drivers/gpu/drm/i915/i915_vma.c b/drivers/gpu/drm/i915/i915_vma.c
index 3b43d485d7c2..0c9af30fc3d6 100644
--- a/drivers/gpu/drm/i915/i915_vma.c
+++ b/drivers/gpu/drm/i915/i915_vma.c
@@ -740,11 +740,13 @@ i915_vma_detach(struct i915_vma *vma)
list_del(&vma->vm_link);
}
-static bool try_qad_pin(struct i915_vma *vma, unsigned int flags)
+bool i915_vma_pin_inplace(struct i915_vma *vma, unsigned int flags)
{
unsigned int bound;
bool pinned = true;
+ GEM_BUG_ON(flags & ~I915_VMA_BIND_MASK);
+
bound = atomic_read(&vma->flags);
do {
if (unlikely(flags & ~bound))
@@ -865,7 +867,7 @@ int i915_vma_pin(struct i915_vma *vma, u64 size, u64
alignment, u64 flags)
GEM_BUG_ON(!(flags & (PIN_USER | PIN_GLOBAL)));
/* First try and grab the pin without rebinding the vma */
- if (try_qad_pin(vma, flags & I915_VMA_BIND_MASK))
+ if (i915_vma_pin_inplace(vma, flags & I915_VMA_BIND_MASK))
return 0;
err = vma_get_pages(vma);
diff --git a/drivers/gpu/drm/i915/i915_vma.h b/drivers/gpu/drm/i915/i915_vma.h
index d0d01f909548..03fea54fd573 100644
--- a/drivers/gpu/drm/i915/i915_vma.h
+++ b/drivers/gpu/drm/i915/i915_vma.h
@@ -236,6 +236,8 @@ static inline void i915_vma_unlock(struct i915_vma *vma)
dma_resv_unlock(vma->resv);
}
+bool i915_vma_pin_inplace(struct i915_vma *vma, unsigned int flags);
+
int __must_check
i915_vma_pin(struct i915_vma *vma, u64 size, u64 alignment, u64 flags);
int i915_ggtt_pin(struct i915_vma *vma, u32 align, unsigned int flags);
--
2.20.1
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