path: root/drivers/gpu/drm/i915/i915_gem.c
diff options
authorChris Wilson <chris@chris-wilson.co.uk>2016-08-04 09:09:53 +0100
committerJani Nikula <jani.nikula@intel.com>2016-08-11 00:59:48 +0300
commit2ca17b87e85ffada1e3da941d5c1c9ee4f56ca9f (patch)
treea88b3501378810469b0927440ab0cbae1dc8e9f6 /drivers/gpu/drm/i915/i915_gem.c
parent0a491b96aa59a7232f6c1a81414aa57fb8de8594 (diff)
drm/i915: Add missing rpm wakelock to GGTT pread
Joonas spotted a discrepancy between the pwrite and pread ioctls, in that pwrite takes the rpm wakelock around its GGTT access, The wakelock is required in order for the GTT to function. In disregard for the current convention, we take the rpm wakelock around the access itself rather than around the struct_mutex as the nesting is not strictly required and such ordering will one day be fixed by explicitly noting the barrier dependencies between the GGTT and rpm. Fixes: b50a53715f09 ("drm/i915: Support for pread/pwrite ...") Reported-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com> Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Ankitprasad Sharma <ankitprasad.r.sharma@intel.com> Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com> Cc: drm-intel-fixes@lists.freedesktop.org Link: http://patchwork.freedesktop.org/patch/msgid/1470298193-21765-1-git-send-email-chris@chris-wilson.co.uk Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com> (cherry picked from commit 1dd5b6f2020389e75bb3d269c038497f065e68c9) Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Diffstat (limited to 'drivers/gpu/drm/i915/i915_gem.c')
1 files changed, 4 insertions, 1 deletions
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index aceaad0c2f18..a77ce9983f69 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -879,9 +879,12 @@ i915_gem_pread_ioctl(struct drm_device *dev, void *data,
ret = i915_gem_shmem_pread(dev, obj, args, file);
/* pread for non shmem backed objects */
- if (ret == -EFAULT || ret == -ENODEV)
+ if (ret == -EFAULT || ret == -ENODEV) {
+ intel_runtime_pm_get(to_i915(dev));
ret = i915_gem_gtt_pread(dev, obj, args->size,
args->offset, args->data_ptr);
+ intel_runtime_pm_put(to_i915(dev));
+ }