Actually transferring from shmemfs to the physically contiguous set of
pages should be wholly guarded by its obj->mm.lock!
v2: Remember to free the old pages.
Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Cc: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/i915_gem.c | 44 +++++++++++++++++++++++++++--------------
1 file changed, 29 insertions(+), 15 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 31cbe78171a9..7f3be5deeb5e 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -574,7 +574,8 @@ int
i915_gem_object_attach_phys(struct drm_i915_gem_object *obj,
int align)
{
- int ret;
+ struct sg_table *pages;
+ int err;
if (align > obj->base.size)
return -EINVAL;
@@ -582,32 +583,45 @@ i915_gem_object_attach_phys(struct drm_i915_gem_object *obj,
if (obj->ops == &i915_gem_phys_ops)
return 0;
- if (obj->mm.madv != I915_MADV_WILLNEED)
- return -EFAULT;
-
- if (obj->base.filp == NULL)
+ if (obj->ops != &i915_gem_object_ops)
return -EINVAL;
- ret = i915_gem_object_unbind(obj);
- if (ret)
- return ret;
+ err = i915_gem_object_unbind(obj);
+ if (err)
+ return err;
+
+ mutex_lock(&obj->mm.lock);
+
+ if (obj->mm.quirked) {
+ err = -EFAULT;
+ goto err_unlock;
+ }
- __i915_gem_object_put_pages(obj, I915_MM_NORMAL);
- if (obj->mm.pages)
- return -EBUSY;
+ if (obj->mm.mapping) {
+ err = -EBUSY;
+ goto err_unlock;
+ }
- GEM_BUG_ON(obj->ops != &i915_gem_object_ops);
+ pages = obj->mm.pages;
obj->ops = &i915_gem_phys_ops;
- ret = i915_gem_object_pin_pages(obj);
- if (ret)
+ err = __i915_gem_object_get_pages(obj);
+ if (err)
goto err_xfer;
+ /* Perma-pin (until release) the physical set of pages */
+ __i915_gem_object_pin_pages(obj);
+
+ i915_gem_object_ops.put_pages(obj, pages);
+ mutex_unlock(&obj->mm.lock);
return 0;
err_xfer:
obj->ops = &i915_gem_object_ops;
- return ret;
+ obj->mm.pages = pages;
+err_unlock:
+ mutex_unlock(&obj->mm.lock);
+ return err;
}
static int
--
2.11.0
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