From: "Michael H. Nguyen" <michael.h.nguyen@xxxxxxxxx>
i915_gem_object_write() is a generic function to copy data from
user memory to gem object.
Issue: VIZ-4884
Signed-off-by: Alex Dai <yu.dai@xxxxxxxxx>
---
drivers/gpu/drm/i915/i915_drv.h | 2 ++
drivers/gpu/drm/i915/i915_gem.c | 28 ++++++++++++++++++++++++++++
2 files changed, 30 insertions(+)
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 31e13e9..f5068cb 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -2646,6 +2646,8 @@ void i915_init_vm(struct drm_i915_private *dev_priv,
struct i915_address_space *vm);
void i915_gem_free_object(struct drm_gem_object *obj);
void i915_gem_vma_destroy(struct i915_vma *vma);
+int i915_gem_object_write(struct drm_i915_gem_object *obj,
+ const void *data, const size_t size);
/* Flags used by pin/bind&friends. */
#define PIN_MAPPABLE (1<<0)
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index db59821..fabe8de 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -5238,3 +5238,31 @@ bool i915_gem_obj_is_pinned(struct drm_i915_gem_object *obj)
return false;
}
+/* Fill the @obj with the @size amount of @data */
+int i915_gem_object_write(struct drm_i915_gem_object *obj,
+ const void *data, const size_t size)
+{
+ struct sg_table *sg;
+ size_t bytes;
+ int ret;
+
+ ret = i915_gem_object_get_pages(obj);
+ if (ret)
+ return ret;
+
+ i915_gem_object_pin_pages(obj);
+
+ sg = obj->pages;
+
+ bytes = sg_copy_from_buffer(sg->sgl, sg->nents, (void *)data, size);
+
+ i915_gem_object_unpin_pages(obj);
+
+ if (WARN_ON(bytes != size)) {
+ DRM_ERROR("Uncompleted copy, wrote %zu of %zu", bytes, size);
+ i915_gem_object_put_pages(obj);
+ return -EIO;
+ }
+
+ return 0;
+}
--
1.9.1
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