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drm/i915: Pull obj->userfault tracking under the ggtt->mutex

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Since we want to revoke the ggtt vma from only under the ggtt->mutex, we
need to move protection of the userfault tracking from the struct_mutex
to the ggtt->mutex.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Matthew Auld <matthew.auld@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190822060914.2671-2-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson 2019-08-22 07:09:13 +01:00
parent e2ccc50a3a
commit b7d151ba4b
3 changed files with 11 additions and 5 deletions
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10
drivers/gpu/drm/i915/gem/i915_gem_mman.c
View File

@ -306,14 +306,17 @@ vm_fault_t i915_gem_fault(struct vm_fault *vmf)
if (ret)
goto err_fence;
/* Mark as being mmapped into userspace for later revocation */
assert_rpm_wakelock_held(rpm);
/* Mark as being mmapped into userspace for later revocation */
mutex_lock(&i915->ggtt.vm.mutex);
if (!i915_vma_set_userfault(vma) && !obj->userfault_count++)
list_add(&obj->userfault_link, &i915->ggtt.userfault_list);
mutex_unlock(&i915->ggtt.vm.mutex);
if (CONFIG_DRM_I915_USERFAULT_AUTOSUSPEND)
intel_wakeref_auto(&i915->ggtt.userfault_wakeref,
msecs_to_jiffies_timeout(CONFIG_DRM_I915_USERFAULT_AUTOSUSPEND));
GEM_BUG_ON(!obj->userfault_count);
i915_vma_set_ggtt_write(vma);
@ -408,8 +411,8 @@ void i915_gem_object_release_mmap(struct drm_i915_gem_object *obj)
* requirement that operations to the GGTT be made holding the RPM
* wakeref.
*/
lockdep_assert_held(&i915->drm.struct_mutex);
wakeref = intel_runtime_pm_get(&i915->runtime_pm);
mutex_lock(&i915->ggtt.vm.mutex);
if (!obj->userfault_count)
goto out;
@ -426,6 +429,7 @@ void i915_gem_object_release_mmap(struct drm_i915_gem_object *obj)
wmb();
out:
mutex_unlock(&i915->ggtt.vm.mutex);
intel_runtime_pm_put(&i915->runtime_pm, wakeref);
}

2
drivers/gpu/drm/i915/i915_debugfs.c
View File

@ -94,7 +94,7 @@ static char get_tiling_flag(struct drm_i915_gem_object *obj)
static char get_global_flag(struct drm_i915_gem_object *obj)
{
return obj->userfault_count ? 'g' : ' ';
return READ_ONCE(obj->userfault_count) ? 'g' : ' ';
}
static char get_pin_mapped_flag(struct drm_i915_gem_object *obj)

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

@ -864,7 +864,7 @@ void i915_vma_revoke_mmap(struct i915_vma *vma)
struct drm_vma_offset_node *node = &vma->obj->base.vma_node;
u64 vma_offset;
lockdep_assert_held(&vma->vm->i915->drm.struct_mutex);
lockdep_assert_held(&vma->vm->mutex);
if (!i915_vma_has_userfault(vma))
return;
@ -987,7 +987,9 @@ int i915_vma_unbind(struct i915_vma *vma)
return ret;
/* Force a pagefault for domain tracking on next user access */
mutex_lock(&vma->vm->mutex);
i915_vma_revoke_mmap(vma);
mutex_unlock(&vma->vm->mutex);
__i915_vma_iounmap(vma);
vma->flags &= ~I915_VMA_CAN_FENCE;