drm: Add GEM ("graphics execution manager") to i915 driver.

GEM allows the creation of persistent buffer objects accessible by the
graphics device through new ioctls for managing execution of commands on the
device.  The userland API is almost entirely driver-specific to ensure that
any driver building on this model can easily map the interface to individual
driver requirements.

GEM is used by the 2d driver for managing its internal state allocations and
will be used for pixmap storage to reduce memory consumption and enable
zero-copy GLX_EXT_texture_from_pixmap, and in the 3d driver is used to enable
GL_EXT_framebuffer_object and GL_ARB_pixel_buffer_object.

Signed-off-by: Eric Anholt <eric@anholt.net>
Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 31 insertions, 0 deletions

diff --git a/include/drm/drm.h b/include/drm/drm.h
index 15e55039b7f1..f46ba4b57da4 100644
--- a/include/drm/drm.h
+++ b/include/drm/drm.h
@@ -570,6 +570,34 @@ struct drm_set_version {
         int drm_dd_minor;
 };
 
+/** DRM_IOCTL_GEM_CLOSE ioctl argument type */
+struct drm_gem_close {
+        /** Handle of the object to be closed. */
+        uint32_t handle;
+        uint32_t pad;
+};
+
+/** DRM_IOCTL_GEM_FLINK ioctl argument type */
+struct drm_gem_flink {
+        /** Handle for the object being named */
+        uint32_t handle;
+
+        /** Returned global name */
+        uint32_t name;
+};
+
+/** DRM_IOCTL_GEM_OPEN ioctl argument type */
+struct drm_gem_open {
+        /** Name of object being opened */
+        uint32_t name;
+
+        /** Returned handle for the object */
+        uint32_t handle;
+
+        /** Returned size of the object */
+        uint64_t size;
+};
+
 #define DRM_IOCTL_BASE                  'd'
 #define DRM_IO(nr)                      _IO(DRM_IOCTL_BASE,nr)
 #define DRM_IOR(nr,type)                _IOR(DRM_IOCTL_BASE,nr,type)
@@ -585,6 +613,9 @@ struct drm_set_version {
 #define DRM_IOCTL_GET_STATS             DRM_IOR( 0x06, struct drm_stats)
 #define DRM_IOCTL_SET_VERSION           DRM_IOWR(0x07, struct drm_set_version)
 #define DRM_IOCTL_MODESET_CTL           DRM_IOW(0x08, struct drm_modeset_ctl)
+#define DRM_IOCTL_GEM_CLOSE             DRM_IOW (0x09, struct drm_gem_close)
+#define DRM_IOCTL_GEM_FLINK             DRM_IOWR(0x0a, struct drm_gem_flink)
+#define DRM_IOCTL_GEM_OPEN              DRM_IOWR(0x0b, struct drm_gem_open)
 
 #define DRM_IOCTL_SET_UNIQUE            DRM_IOW( 0x10, struct drm_unique)
 #define DRM_IOCTL_AUTH_MAGIC            DRM_IOW( 0x11, struct drm_auth)