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drm/i915: restore ggtt double-bind avoidance

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This was accidentally lost in

commit 75d04a3773
Author: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Date:   Tue Apr 28 17:56:17 2015 +0300

    drm/i915/gtt: Allocate va range only if vma is not bound

While at it implement an improved version suggested by Chris which
avoids the double-bind irrespective of what type of bind is done
first.

Note that this exact bug was already addressed in

commit d0e30adc42
Author: Chris Wilson <chris@chris-wilson.co.uk>
Date:   Wed Jul 29 20:02:48 2015 +0100

    drm/i915: Mark PIN_USER binding as GLOBAL_BIND without the aliasing ppgtt

but the problem is still that originally in

commit 0875546c53
Author: Daniel Vetter <daniel.vetter@ffwll.ch>
Date:   Mon Apr 20 09:04:05 2015 -0700

    drm/i915: Fix up the vma aliasing ppgtt binding

if forgotten to take into account there case where we have a
GLOBAL_BIND before a LOCAL_BIND. This patch here fixes that.

v2: Pimp commit message and revert the partial fix.

v3: Split into two functions to specialize on aliasing_ppgtt y/n.

v4: WARN_ON for paranoia in the init sequence, since the ggtt probe
and aliasing ppgtt setup are far apart.

v5: Style nits.

Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Michel Thierry <michel.thierry@intel.com>
Cc: Mika Kuoppala <mika.kuoppala@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Link: http://mid.gmane.org/1444911781-32607-1-git-send-email-daniel.vetter@ffwll.ch
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Daniel Vetter 2015-10-15 14:23:01 +02:00
parent e12c8ce8c9
commit 0a87871626
1 changed files with 34 additions and 12 deletions
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46
drivers/gpu/drm/i915/i915_gem_gtt.c
View File

@ -2501,6 +2501,36 @@ static void i915_ggtt_clear_range(struct i915_address_space *vm,
static int ggtt_bind_vma(struct i915_vma *vma, static int ggtt_bind_vma(struct i915_vma *vma,
enum i915_cache_level cache_level, enum i915_cache_level cache_level,
u32 flags) u32 flags)
{
struct drm_i915_gem_object *obj = vma->obj;
u32 pte_flags = 0;
int ret;
ret = i915_get_ggtt_vma_pages(vma);
if (ret)
return ret;
/* Currently applicable only to VLV */
if (obj->gt_ro)
pte_flags |= PTE_READ_ONLY;
vma->vm->insert_entries(vma->vm, vma->ggtt_view.pages,
vma->node.start,
cache_level, pte_flags);
/*
* Without aliasing PPGTT there's no difference between
* GLOBAL/LOCAL_BIND, it's all the same ptes. Hence unconditionally
* upgrade to both bound if we bind either to avoid double-binding.
*/
vma->bound |= GLOBAL_BIND | LOCAL_BIND;
return 0;
}
static int aliasing_gtt_bind_vma(struct i915_vma *vma,
enum i915_cache_level cache_level,
u32 flags)
{ {
struct drm_device *dev = vma->vm->dev; struct drm_device *dev = vma->vm->dev;
struct drm_i915_private *dev_priv = dev->dev_private; struct drm_i915_private *dev_priv = dev->dev_private;
@ -2519,23 +2549,13 @@ static int ggtt_bind_vma(struct i915_vma *vma,
pte_flags |= PTE_READ_ONLY; pte_flags |= PTE_READ_ONLY;
if (!dev_priv->mm.aliasing_ppgtt || flags & GLOBAL_BIND) { if (flags & GLOBAL_BIND) {
vma->vm->insert_entries(vma->vm, pages, vma->vm->insert_entries(vma->vm, pages,
vma->node.start, vma->node.start,
cache_level, pte_flags); cache_level, pte_flags);
/* Note the inconsistency here is due to absence of the
* aliasing ppgtt on gen4 and earlier. Though we always
* request PIN_USER for execbuffer (translated to LOCAL_BIND),
* without the appgtt, we cannot honour that request and so
* must substitute it with a global binding. Since we do this
* behind the upper layers back, we need to explicitly set
* the bound flag ourselves.
*/
vma->bound |= GLOBAL_BIND;
} }
if (dev_priv->mm.aliasing_ppgtt && flags & LOCAL_BIND) { if (flags & LOCAL_BIND) {
struct i915_hw_ppgtt *appgtt = dev_priv->mm.aliasing_ppgtt; struct i915_hw_ppgtt *appgtt = dev_priv->mm.aliasing_ppgtt;
appgtt->base.insert_entries(&appgtt->base, pages, appgtt->base.insert_entries(&appgtt->base, pages,
vma->node.start, vma->node.start,
@ -2699,6 +2719,8 @@ static int i915_gem_setup_global_gtt(struct drm_device *dev,
true); true);
dev_priv->mm.aliasing_ppgtt = ppgtt; dev_priv->mm.aliasing_ppgtt = ppgtt;
WARN_ON(dev_priv->gtt.base.bind_vma != ggtt_bind_vma);
dev_priv->gtt.base.bind_vma = aliasing_gtt_bind_vma;
} }
return 0; return 0;