From: Sourab Gupta <sourab.gupta@xxxxxxxxx>
Adding the flag 'I915_CPU_MAP_NOT_NEEDED' to gem_create ioctl.
This is to indicate the driver that direct cpu access to this
buffer object is not needed and hence Driver can opt to use Stolen
area as a backing store for it. When this flag is set, try to
allocate the objects from Stolen area. Fallback to shmem in case
of allocation failure.
Signed-off-by: Sourab Gupta <sourab.gupta@xxxxxxxxx>
Signed-off-by: Akash Goel <akash.goel@xxxxxxxxx>
---
drivers/gpu/drm/i915/i915_gem.c | 17 ++++++++++++-----
include/uapi/drm/i915_drm.h | 3 ++-
2 files changed, 14 insertions(+), 6 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 177c207..22b531a 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -225,9 +225,11 @@ static int
i915_gem_create(struct drm_file *file,
struct drm_device *dev,
uint64_t size,
- uint32_t *handle_p)
+ uint32_t *handle_p,
+ uint32_t flags)
+
{
- struct drm_i915_gem_object *obj;
+ struct drm_i915_gem_object *obj=NULL;
int ret;
u32 handle;
@@ -236,7 +238,12 @@ i915_gem_create(struct drm_file *file,
return -EINVAL;
/* Allocate the new object */
- obj = i915_gem_alloc_object(dev, size);
+ if (flags & I915_CPU_MAP_NOT_NEEDED)
+ obj = i915_gem_object_create_stolen(dev, size);
+
+ if (obj == NULL)
+ obj = i915_gem_alloc_object(dev, size);
+
if (obj == NULL)
return -ENOMEM;
@@ -259,7 +266,7 @@ i915_gem_dumb_create(struct drm_file *file,
args->pitch = ALIGN(args->width * DIV_ROUND_UP(args->bpp, 8), 64);
args->size = args->pitch * args->height;
return i915_gem_create(file, dev,
- args->size, &args->handle);
+ args->size, &args->handle, args->flags);
}
/**
@@ -272,7 +279,7 @@ i915_gem_create_ioctl(struct drm_device *dev, void *data,
struct drm_i915_gem_create *args = data;
return i915_gem_create(file, dev,
- args->size, &args->handle);
+ args->size, &args->handle, args->flags);
}
static inline int
diff --git a/include/uapi/drm/i915_drm.h b/include/uapi/drm/i915_drm.h
index 126bfaa..8625f54 100644
--- a/include/uapi/drm/i915_drm.h
+++ b/include/uapi/drm/i915_drm.h
@@ -431,7 +431,8 @@ struct drm_i915_gem_create {
* Object handles are nonzero.
*/
__u32 handle;
- __u32 pad;
+ __u32 flags;
+#define I915_CPU_MAP_NOT_NEEDED 0x1
};
struct drm_i915_gem_pread {
--
1.7.9.5
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