mirrors
/
linux-stable
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
1
0
Fork 0
Code Issues Releases Wiki Activity

drm/i915: Consolidate get_fence with pin_fence 

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 <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20171009084401.29090-2-chris@chris-wilson.co.uk
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
This commit is contained in:
Chris Wilson 2017-10-09 09:43:56 +01:00
parent b4563f595e
commit 3bd4073524
7 changed files with 45 additions and 30 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/gpu/drm/i915/i915_drv.h
View File

@ -3759,8 +3759,6 @@ 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);

3
drivers/gpu/drm/i915/i915_gem.c
View File

@ -1910,7 +1910,7 @@ 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;
@ -1926,6 +1926,7 @@ 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:

10
drivers/gpu/drm/i915/i915_gem_execbuffer.c
View File

@ -367,12 +367,12 @@ 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;
}
@ -385,7 +385,7 @@ 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);
}
@ -563,13 +563,13 @@ 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;
}

33
drivers/gpu/drm/i915/i915_gem_fence_reg.c
View File

@ -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.

4
drivers/gpu/drm/i915/i915_vma.c
View File

@ -309,12 +309,10 @@ void __iomem *i915_vma_pin_iomap(struct i915_vma *vma)
__i915_vma_pin(vma);
err = i915_vma_get_fence(vma);
err = i915_vma_pin_fence(vma);
if (err)
goto err_unpin;
i915_vma_pin_fence(vma);
return ptr;
err_unpin:

20
drivers/gpu/drm/i915/i915_vma.h
View File

@ -345,15 +345,13 @@ 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--;
}
/**
@ -368,10 +366,8 @@ 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

3
drivers/gpu/drm/i915/intel_display.c
View File

@ -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);