[Intel-gfx] [PATCH 2/6] drm/i915: Support for creating Stolen memory backed objects
ankitprasad.r.sharma at intel.com
ankitprasad.r.sharma at intel.com
Wed Oct 7 23:24:25 PDT 2015
From: Ankitprasad Sharma <ankitprasad.r.sharma at intel.com>
Extend the drm_i915_gem_create structure to add support for
creating Stolen memory backed objects. Added a new flag through
which user can specify the preference to allocate the object from
stolen memory, which if set, an attempt will be made to allocate
the object from stolen memory subject to the availability of
free space in the stolen region.
v2: Rebased to the latest drm-intel-nightly (Ankit)
v3: Changed versioning of GEM_CREATE param, added new comments (Tvrtko)
v4: Changed size from 32b to 64b to prevent userspace overflow (Tvrtko)
Corrected function arguments ordering (Chris)
Testcase: igt/gem_stolen
Signed-off-by: Ankitprasad Sharma <ankitprasad.r.sharma at intel.com>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
---
drivers/gpu/drm/i915/i915_dma.c | 3 +++
drivers/gpu/drm/i915/i915_drv.h | 2 +-
drivers/gpu/drm/i915/i915_gem.c | 30 +++++++++++++++++++++++++++---
drivers/gpu/drm/i915/i915_gem_stolen.c | 4 ++--
include/uapi/drm/i915_drm.h | 16 ++++++++++++++++
5 files changed, 49 insertions(+), 6 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_dma.c b/drivers/gpu/drm/i915/i915_dma.c
index 817b05c..0a25f23 100644
--- a/drivers/gpu/drm/i915/i915_dma.c
+++ b/drivers/gpu/drm/i915/i915_dma.c
@@ -170,6 +170,9 @@ static int i915_getparam(struct drm_device *dev, void *data,
case I915_PARAM_HAS_RESOURCE_STREAMER:
value = HAS_RESOURCE_STREAMER(dev);
break;
+ case I915_PARAM_CREATE_VERSION:
+ value = 2;
+ break;
default:
DRM_DEBUG("Unknown parameter %d\n", param->param);
return -EINVAL;
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index f962425..bca1572 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -3191,7 +3191,7 @@ void i915_gem_stolen_remove_node(struct drm_i915_private *dev_priv,
int i915_gem_init_stolen(struct drm_device *dev);
void i915_gem_cleanup_stolen(struct drm_device *dev);
struct drm_i915_gem_object *
-i915_gem_object_create_stolen(struct drm_device *dev, u32 size);
+i915_gem_object_create_stolen(struct drm_device *dev, u64 size);
struct drm_i915_gem_object *
i915_gem_object_create_stolen_for_preallocated(struct drm_device *dev,
u32 stolen_offset,
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index e6b3bc7..d3f4321 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -375,6 +375,7 @@ static int
i915_gem_create(struct drm_file *file,
struct drm_device *dev,
uint64_t size,
+ uint32_t flags,
uint32_t *handle_p)
{
struct drm_i915_gem_object *obj;
@@ -385,8 +386,31 @@ i915_gem_create(struct drm_file *file,
if (size == 0)
return -EINVAL;
+ if (flags & __I915_CREATE_UNKNOWN_FLAGS)
+ return -EINVAL;
+
/* Allocate the new object */
- obj = i915_gem_alloc_object(dev, size);
+ if (flags & I915_CREATE_PLACEMENT_STOLEN) {
+ mutex_lock(&dev->struct_mutex);
+ obj = i915_gem_object_create_stolen(dev, size);
+ if (!obj) {
+ mutex_unlock(&dev->struct_mutex);
+ return -ENOMEM;
+ }
+
+ /* Always clear fresh buffers before handing to userspace */
+ ret = i915_gem_clear_object(obj);
+ if (ret) {
+ drm_gem_object_unreference(&obj->base);
+ mutex_unlock(&dev->struct_mutex);
+ return ret;
+ }
+
+ mutex_unlock(&dev->struct_mutex);
+ } else {
+ obj = i915_gem_alloc_object(dev, size);
+ }
+
if (obj == NULL)
return -ENOMEM;
@@ -409,7 +433,7 @@ 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, 0, &args->handle);
}
/**
@@ -422,7 +446,7 @@ 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->flags, &args->handle);
}
static inline int
diff --git a/drivers/gpu/drm/i915/i915_gem_stolen.c b/drivers/gpu/drm/i915/i915_gem_stolen.c
index 1520779..5ec2190 100644
--- a/drivers/gpu/drm/i915/i915_gem_stolen.c
+++ b/drivers/gpu/drm/i915/i915_gem_stolen.c
@@ -497,7 +497,7 @@ cleanup:
}
struct drm_i915_gem_object *
-i915_gem_object_create_stolen(struct drm_device *dev, u32 size)
+i915_gem_object_create_stolen(struct drm_device *dev, u64 size)
{
struct drm_i915_private *dev_priv = dev->dev_private;
struct drm_i915_gem_object *obj;
@@ -507,7 +507,7 @@ i915_gem_object_create_stolen(struct drm_device *dev, u32 size)
if (!drm_mm_initialized(&dev_priv->mm.stolen))
return NULL;
- DRM_DEBUG_KMS("creating stolen object: size=%x\n", size);
+ DRM_DEBUG_KMS("creating stolen object: size=%llx\n", size);
if (size == 0)
return NULL;
diff --git a/include/uapi/drm/i915_drm.h b/include/uapi/drm/i915_drm.h
index fd5aa47..ee60459 100644
--- a/include/uapi/drm/i915_drm.h
+++ b/include/uapi/drm/i915_drm.h
@@ -356,6 +356,7 @@ typedef struct drm_i915_irq_wait {
#define I915_PARAM_EU_TOTAL 34
#define I915_PARAM_HAS_GPU_RESET 35
#define I915_PARAM_HAS_RESOURCE_STREAMER 36
+#define I915_PARAM_CREATE_VERSION 37
typedef struct drm_i915_getparam {
__s32 param;
@@ -455,6 +456,21 @@ struct drm_i915_gem_create {
*/
__u32 handle;
__u32 pad;
+ /**
+ * Requested flags (currently used for placement
+ * (which memory domain))
+ *
+ * You can request that the object be created from special memory
+ * rather than regular system pages using this parameter. Such
+ * irregular objects may have certain restrictions (such as CPU
+ * access to a stolen object is verboten).
+ *
+ * This can be used in the future for other purposes too
+ * e.g. specifying tiling/caching/madvise
+ */
+ __u32 flags;
+#define I915_CREATE_PLACEMENT_STOLEN (1<<0) /* Cannot use CPU mmaps */
+#define __I915_CREATE_UNKNOWN_FLAGS -(I915_CREATE_PLACEMENT_STOLEN << 1)
};
struct drm_i915_gem_pread {
--
1.9.1
More information about the Intel-gfx
mailing list