[PATCH v4 3/4] drm/xe: Use simple xchg to cache DPT
Maarten Lankhorst
maarten.lankhorst at linux.intel.com
Mon May 6 10:36:03 UTC 2024
Preallocate a DPT when creating the FB, and store it in
i915_address_space. This can be used to prevent an expensive
allocation in the pinning path.
Signed-off-by: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>
---
drivers/gpu/drm/xe/display/xe_fb_pin.c | 33 +++++++++++++++-----------
1 file changed, 19 insertions(+), 14 deletions(-)
diff --git a/drivers/gpu/drm/xe/display/xe_fb_pin.c b/drivers/gpu/drm/xe/display/xe_fb_pin.c
index 5a8d6857fb89..6ebda3ded8b4 100644
--- a/drivers/gpu/drm/xe/display/xe_fb_pin.c
+++ b/drivers/gpu/drm/xe/display/xe_fb_pin.c
@@ -112,9 +112,11 @@ static struct xe_bo *xe_fb_dpt_alloc(struct intel_framebuffer *fb)
return dpt;
}
-static void xe_fb_dpt_free(struct i915_vma *vma)
+static void xe_fb_dpt_free(struct i915_vma *vma, struct intel_framebuffer *fb)
{
- xe_bo_put(vma->dpt);
+ if (!fb || cmpxchg((struct xe_bo **)&fb->dpt_vm, NULL, vma->dpt))
+ xe_bo_put(vma->dpt);
+
vma->dpt = NULL;
}
@@ -152,10 +154,11 @@ static int xe_fb_dpt_map_ggtt(struct xe_bo *dpt)
static int
xe_fb_dpt_alloc_pinned(struct i915_vma *vma, struct intel_framebuffer *fb)
{
- struct xe_bo *dpt;
+ struct xe_bo *dpt = (struct xe_bo *)xchg(&fb->dpt_vm, NULL);
int err;
- dpt = xe_fb_dpt_alloc(fb);
+ if (!dpt)
+ dpt = xe_fb_dpt_alloc(fb);
if (IS_ERR(dpt))
return PTR_ERR(dpt);
@@ -171,17 +174,17 @@ xe_fb_dpt_alloc_pinned(struct i915_vma *vma, struct intel_framebuffer *fb)
ttm_bo_unreserve(&dpt->ttm);
}
if (err)
- xe_fb_dpt_free(vma);
+ xe_fb_dpt_free(vma, fb);
return err;
}
-static void xe_fb_dpt_unpin_free(struct i915_vma *vma)
+static void xe_fb_dpt_unpin_free(struct i915_vma *vma, struct intel_framebuffer *fb)
{
ttm_bo_reserve(&vma->dpt->ttm, false, false, NULL);
ttm_bo_unpin(&vma->dpt->ttm);
ttm_bo_unreserve(&vma->dpt->ttm);
- xe_fb_dpt_free(vma);
+ xe_fb_dpt_free(vma, fb);
}
static int __xe_pin_fb_vma_dpt(struct intel_framebuffer *fb,
@@ -237,7 +240,7 @@ static int __xe_pin_fb_vma_dpt(struct intel_framebuffer *fb,
ret = xe_fb_dpt_map_ggtt(dpt);
if (ret)
- xe_fb_dpt_unpin_free(vma);
+ xe_fb_dpt_unpin_free(vma, fb);
return ret;
}
@@ -399,14 +402,14 @@ static struct i915_vma *__xe_pin_fb_vma(struct intel_framebuffer *fb,
return ERR_PTR(ret);
}
-static void __xe_unpin_fb_vma(struct i915_vma *vma)
+static void __xe_unpin_fb_vma(struct i915_vma *vma, struct intel_framebuffer *fb)
{
struct xe_device *xe = to_xe_device(vma->bo->ttm.base.dev);
struct xe_ggtt *ggtt = xe_device_get_root_tile(xe)->mem.ggtt;
if (vma->dpt) {
xe_ggtt_remove_bo(ggtt, vma->dpt);
- xe_fb_dpt_unpin_free(vma);
+ xe_fb_dpt_unpin_free(vma, fb);
} else {
if (!drm_mm_node_allocated(&vma->bo->ggtt_node) ||
vma->bo->ggtt_node.start != vma->node.start)
@@ -433,7 +436,7 @@ intel_pin_and_fence_fb_obj(struct drm_framebuffer *fb,
void intel_unpin_fb_vma(struct i915_vma *vma, unsigned long flags)
{
- __xe_unpin_fb_vma(vma);
+ __xe_unpin_fb_vma(vma, NULL);
}
int intel_plane_pin_fb(struct intel_plane_state *plane_state)
@@ -455,7 +458,7 @@ int intel_plane_pin_fb(struct intel_plane_state *plane_state)
void intel_plane_unpin_fb(struct intel_plane_state *old_plane_state)
{
- __xe_unpin_fb_vma(old_plane_state->ggtt_vma);
+ __xe_unpin_fb_vma(old_plane_state->ggtt_vma, to_intel_framebuffer(old_plane_state->hw.fb));
old_plane_state->ggtt_vma = NULL;
}
@@ -465,10 +468,12 @@ void intel_plane_unpin_fb(struct intel_plane_state *old_plane_state)
*/
struct i915_address_space *intel_dpt_create(struct intel_framebuffer *fb)
{
- return NULL;
+ return (struct i915_address_space *)xe_fb_dpt_alloc(fb);
}
void intel_dpt_destroy(struct i915_address_space *vm)
{
- return;
+ struct xe_bo *bo = (struct xe_bo *)vm;
+
+ xe_bo_put(bo);
}
--
2.43.0
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