From: Matthew Auld <matthew.a...@intel.com>
Similar to pwrite, we need pread for (better) support of non-GTT
backends.
Signed-off-by: Matthew Auld <matthew.a...@intel.com>
Cc: Joonas Lahtinen <joonas.lahti...@linux.intel.com>
Cc: Abdiel Janulgue <abdiel.janul...@linux.intel.com>
Signed-off-by: Janusz Krzysztofik <janusz.krzyszto...@intel.com>
Cc: Michal Wajdeczko <michal.wajdec...@intel.com>
---
drivers/gpu/drm/i915/gem/i915_gem_object_types.h | 2 ++
drivers/gpu/drm/i915/i915_gem.c | 6 ++++++
2 files changed, 8 insertions(+)
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_object_types.h
b/drivers/gpu/drm/i915/gem/i915_gem_object_types.h
index a387e3ee728b..3ad13556ed75 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_object_types.h
+++ b/drivers/gpu/drm/i915/gem/i915_gem_object_types.h
@@ -55,6 +55,8 @@ struct drm_i915_gem_object_ops {
void (*truncate)(struct drm_i915_gem_object *obj);
void (*writeback)(struct drm_i915_gem_object *obj);
+ int (*pread)(struct drm_i915_gem_object *obj,
+ const struct drm_i915_gem_pread *arg);
int (*pwrite)(struct drm_i915_gem_object *obj,
const struct drm_i915_gem_pwrite *arg);
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index dd0a3271b4e2..bb9121887ce6 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -469,6 +469,12 @@ i915_gem_pread_ioctl(struct drm_device *dev, void *data,
trace_i915_gem_object_pread(obj, args->offset, args->size);
+ if (obj->ops->pread) {
+ ret = obj->ops->pread(obj, args);
+ if (ret != -ENODEV)
+ goto out;
+ }
+
ret = i915_gem_object_wait(obj,
I915_WAIT_INTERRUPTIBLE,
MAX_SCHEDULE_TIMEOUT);
--
2.21.0
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