Following the pattern now used for obj->mm.pages, use just pin_fence and
unpin_fence to control access to the fence registers. I.e. instead of
calling get_fence(); pin_fence(), we now just need to call pin_fence().
This will make it easier to reduce the locking requirements around
fence registers.
Signed-off-by: Chris Wilson <ch...@chris-wilson.co.uk>
---
drivers/gpu/drm/i915/i915_drv.h | 2 --
drivers/gpu/drm/i915/i915_gem.c | 3 ++-
drivers/gpu/drm/i915/i915_gem_execbuffer.c | 10 ++++-----
drivers/gpu/drm/i915/i915_gem_fence_reg.c | 33 +++++++++++++++++++++++++-----
drivers/gpu/drm/i915/i915_vma.c | 3 +--
drivers/gpu/drm/i915/i915_vma.h | 20 ++++++++----------
drivers/gpu/drm/i915/intel_display.c | 3 +--
7 files changed, 45 insertions(+), 29 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index a4b49016593e..f8d98d3736ac 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -3714,8 +3714,6 @@ i915_vm_to_ppgtt(struct i915_address_space *vm)
}
/* i915_gem_fence_reg.c */
-int __must_check i915_vma_get_fence(struct i915_vma *vma);
-int __must_check i915_vma_put_fence(struct i915_vma *vma);
struct drm_i915_fence_reg *
i915_reserve_fence(struct drm_i915_private *dev_priv);
void i915_unreserve_fence(struct drm_i915_fence_reg *fence);
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index a72376007b64..90bf5cba712f 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -1912,7 +1912,7 @@ int i915_gem_fault(struct vm_fault *vmf)
if (ret)
goto err_unpin;
- ret = i915_vma_get_fence(vma);
+ ret = i915_vma_pin_fence(vma);
if (ret)
goto err_unpin;
@@ -1928,6 +1928,7 @@ int i915_gem_fault(struct vm_fault *vmf)
min_t(u64, vma->size, area->vm_end -
area->vm_start),
&ggtt->mappable);
+ i915_vma_unpin_fence(vma);
err_unpin:
__i915_vma_unpin(vma);
err_unlock:
diff --git a/drivers/gpu/drm/i915/i915_gem_execbuffer.c
b/drivers/gpu/drm/i915/i915_gem_execbuffer.c
index 7687483ff218..da12bba60c40 100644
--- a/drivers/gpu/drm/i915/i915_gem_execbuffer.c
+++ b/drivers/gpu/drm/i915/i915_gem_execbuffer.c
@@ -366,12 +366,12 @@ eb_pin_vma(struct i915_execbuffer *eb,
return false;
if (unlikely(exec_flags & EXEC_OBJECT_NEEDS_FENCE)) {
- if (unlikely(i915_vma_get_fence(vma))) {
+ if (unlikely(i915_vma_pin_fence(vma))) {
i915_vma_unpin(vma);
return false;
}
- if (i915_vma_pin_fence(vma))
+ if (vma->fence)
exec_flags |= __EXEC_OBJECT_HAS_FENCE;
}
@@ -384,7 +384,7 @@ static inline void __eb_unreserve_vma(struct i915_vma *vma,
unsigned int flags)
GEM_BUG_ON(!(flags & __EXEC_OBJECT_HAS_PIN));
if (unlikely(flags & __EXEC_OBJECT_HAS_FENCE))
- i915_vma_unpin_fence(vma);
+ __i915_vma_unpin_fence(vma);
__i915_vma_unpin(vma);
}
@@ -562,13 +562,13 @@ static int eb_reserve_vma(const struct i915_execbuffer
*eb,
}
if (unlikely(exec_flags & EXEC_OBJECT_NEEDS_FENCE)) {
- err = i915_vma_get_fence(vma);
+ err = i915_vma_pin_fence(vma);
if (unlikely(err)) {
i915_vma_unpin(vma);
return err;
}
- if (i915_vma_pin_fence(vma))
+ if (vma->fence)
exec_flags |= __EXEC_OBJECT_HAS_FENCE;
}
diff --git a/drivers/gpu/drm/i915/i915_gem_fence_reg.c
b/drivers/gpu/drm/i915/i915_gem_fence_reg.c
index 2783d63bd1ad..af824b8d73ea 100644
--- a/drivers/gpu/drm/i915/i915_gem_fence_reg.c
+++ b/drivers/gpu/drm/i915/i915_gem_fence_reg.c
@@ -280,8 +280,7 @@ static int fence_update(struct drm_i915_fence_reg *fence,
*
* 0 on success, negative error code on failure.
*/
-int
-i915_vma_put_fence(struct i915_vma *vma)
+int i915_vma_put_fence(struct i915_vma *vma)
{
struct drm_i915_fence_reg *fence = vma->fence;
@@ -299,6 +298,8 @@ static struct drm_i915_fence_reg *fence_find(struct
drm_i915_private *dev_priv)
struct drm_i915_fence_reg *fence;
list_for_each_entry(fence, &dev_priv->mm.fence_list, link) {
+ GEM_BUG_ON(fence->vma && fence->vma->fence != fence);
+
if (fence->pin_count)
continue;
@@ -313,7 +314,7 @@ static struct drm_i915_fence_reg *fence_find(struct
drm_i915_private *dev_priv)
}
/**
- * i915_vma_get_fence - set up fencing for a vma
+ * i915_vma_pin_fence - set up fencing for a vma
* @vma: vma to map through a fence reg
*
* When mapping objects through the GTT, userspace wants to be able to write
@@ -331,10 +332,11 @@ static struct drm_i915_fence_reg *fence_find(struct
drm_i915_private *dev_priv)
* 0 on success, negative error code on failure.
*/
int
-i915_vma_get_fence(struct i915_vma *vma)
+i915_vma_pin_fence(struct i915_vma *vma)
{
struct drm_i915_fence_reg *fence;
struct i915_vma *set = i915_gem_object_is_tiled(vma->obj) ? vma : NULL;
+ int err;
/* Note that we revoke fences on runtime suspend. Therefore the user
* must keep the device awake whilst using the fence.
@@ -344,6 +346,8 @@ i915_vma_get_fence(struct i915_vma *vma)
/* Just update our place in the LRU if our fence is getting reused. */
if (vma->fence) {
fence = vma->fence;
+ GEM_BUG_ON(fence->vma != vma);
+ fence->pin_count++;
if (!fence->dirty) {
list_move_tail(&fence->link,
&fence->i915->mm.fence_list);
@@ -353,10 +357,25 @@ i915_vma_get_fence(struct i915_vma *vma)
fence = fence_find(vma->vm->i915);
if (IS_ERR(fence))
return PTR_ERR(fence);
+
+ GEM_BUG_ON(fence->pin_count);
+ fence->pin_count++;
} else
return 0;
- return fence_update(fence, set);
+ err = fence_update(fence, set);
+ if (err)
+ goto out_unpin;
+
+ GEM_BUG_ON(fence->vma != set);
+ GEM_BUG_ON(vma->fence != (set ? fence : NULL));
+
+ if (set)
+ return 0;
+
+out_unpin:
+ fence->pin_count--;
+ return err;
}
/**
@@ -429,6 +448,8 @@ void i915_gem_revoke_fences(struct drm_i915_private
*dev_priv)
for (i = 0; i < dev_priv->num_fence_regs; i++) {
struct drm_i915_fence_reg *fence = &dev_priv->fence_regs[i];
+ GEM_BUG_ON(fence->vma && fence->vma->fence != fence);
+
if (fence->vma)
i915_gem_release_mmap(fence->vma->obj);
}
@@ -450,6 +471,8 @@ void i915_gem_restore_fences(struct drm_i915_private
*dev_priv)
struct drm_i915_fence_reg *reg = &dev_priv->fence_regs[i];
struct i915_vma *vma = reg->vma;
+ GEM_BUG_ON(vma && vma->fence != reg);
+
/*
* Commit delayed tiling changes if we have an object still
* attached to the fence, otherwise just clear the fence.
diff --git a/drivers/gpu/drm/i915/i915_vma.c b/drivers/gpu/drm/i915/i915_vma.c
index f15542e64808..c7d5604b4489 100644
--- a/drivers/gpu/drm/i915/i915_vma.c
+++ b/drivers/gpu/drm/i915/i915_vma.c
@@ -303,12 +303,11 @@ void __iomem *i915_vma_pin_iomap(struct i915_vma *vma)
__i915_vma_pin(vma);
- ret = i915_vma_get_fence(vma);
+ ret = i915_vma_pin_fence(vma);
if (ret) {
__i915_vma_unpin(vma);
return IO_ERR_PTR(ret);
}
- i915_vma_pin_fence(vma);
return ptr;
}
diff --git a/drivers/gpu/drm/i915/i915_vma.h b/drivers/gpu/drm/i915/i915_vma.h
index 347a40d08b9b..ab4a3c0b1526 100644
--- a/drivers/gpu/drm/i915/i915_vma.h
+++ b/drivers/gpu/drm/i915/i915_vma.h
@@ -344,15 +344,13 @@ static inline struct page *i915_vma_first_page(struct
i915_vma *vma)
*
* True if the vma has a fence, false otherwise.
*/
-static inline bool
-i915_vma_pin_fence(struct i915_vma *vma)
+int i915_vma_pin_fence(struct i915_vma *vma);
+int __must_check i915_vma_put_fence(struct i915_vma *vma);
+
+static inline void __i915_vma_unpin_fence(struct i915_vma *vma)
{
- lockdep_assert_held(&vma->obj->base.dev->struct_mutex);
- if (vma->fence) {
- vma->fence->pin_count++;
- return true;
- } else
- return false;
+ GEM_BUG_ON(vma->fence->pin_count <= 0);
+ vma->fence->pin_count--;
}
/**
@@ -367,10 +365,8 @@ static inline void
i915_vma_unpin_fence(struct i915_vma *vma)
{
lockdep_assert_held(&vma->obj->base.dev->struct_mutex);
- if (vma->fence) {
- GEM_BUG_ON(vma->fence->pin_count <= 0);
- vma->fence->pin_count--;
- }
+ if (vma->fence)
+ __i915_vma_unpin_fence(vma);
}
#endif
diff --git a/drivers/gpu/drm/i915/intel_display.c
b/drivers/gpu/drm/i915/intel_display.c
index efb8c0875fc8..581cd21065e4 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -2219,8 +2219,7 @@ intel_pin_and_fence_fb_obj(struct drm_framebuffer *fb,
unsigned int rotation)
* something and try to run the system in a "less than optimal"
* mode that matches the user configuration.
*/
- if (i915_vma_get_fence(vma) == 0)
- i915_vma_pin_fence(vma);
+ i915_vma_pin_fence(vma);
}
i915_vma_get(vma);
--
2.14.1
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