drm/tegra: Add SET/GET_TILING IOCTLs

Currently the tiling parameters of buffer objects can only be set at
allocation time, and only a single tiled mode is supported. This new
DRM_TEGRA_GEM_SET_TILING IOCTL allows more modes to be set and also
allows the tiling mode to be changed after the allocation. This will
enable the Tegra DRM driver to import buffers from a GPU and directly
scan them out by configuring the display controller appropriately.

To complement this, the DRM_TEGRA_GEM_GET_TILING IOCTL can query the
current tiling mode of a buffer object. This is necessary when importing
buffers via handle (as is done in Mesa for example) so that userspace
can determine the proper parameters for the 2D or 3D engines.

Reviewed-by: Stéphane Marchesin <marcheu@chromium.org>
Tested-by: Alexandre Courbot <acourbot@nvidia.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>

1 files changed, 25 insertions, 0 deletions

diff --git a/include/uapi/drm/tegra_drm.h b/include/uapi/drm/tegra_drm.h
index b75482112428..0829f75eb986 100644
--- a/include/uapi/drm/tegra_drm.h
+++ b/include/uapi/drm/tegra_drm.h
@@ -129,6 +129,27 @@ struct drm_tegra_submit {
         __u32 reserved[5];      /* future expansion */
 };
 
+#define DRM_TEGRA_GEM_TILING_MODE_PITCH 0
+#define DRM_TEGRA_GEM_TILING_MODE_TILED 1
+#define DRM_TEGRA_GEM_TILING_MODE_BLOCK 2
+
+struct drm_tegra_gem_set_tiling {
+        /* input */
+        __u32 handle;
+        __u32 mode;
+        __u32 value;
+        __u32 pad;
+};
+
+struct drm_tegra_gem_get_tiling {
+        /* input */
+        __u32 handle;
+        /* output */
+        __u32 mode;
+        __u32 value;
+        __u32 pad;
+};
+
 #define DRM_TEGRA_GEM_CREATE            0x00
 #define DRM_TEGRA_GEM_MMAP              0x01
 #define DRM_TEGRA_SYNCPT_READ           0x02
@@ -139,6 +160,8 @@ struct drm_tegra_submit {
 #define DRM_TEGRA_GET_SYNCPT            0x07
 #define DRM_TEGRA_SUBMIT                0x08
 #define DRM_TEGRA_GET_SYNCPT_BASE       0x09
+#define DRM_TEGRA_GEM_SET_TILING        0x0a
+#define DRM_TEGRA_GEM_GET_TILING        0x0b
 
 #define DRM_IOCTL_TEGRA_GEM_CREATE DRM_IOWR(DRM_COMMAND_BASE + DRM_TEGRA_GEM_CREATE, struct drm_tegra_gem_create)
 #define DRM_IOCTL_TEGRA_GEM_MMAP DRM_IOWR(DRM_COMMAND_BASE + DRM_TEGRA_GEM_MMAP, struct drm_tegra_gem_mmap)
@@ -150,5 +173,7 @@ struct drm_tegra_submit {
 #define DRM_IOCTL_TEGRA_GET_SYNCPT DRM_IOWR(DRM_COMMAND_BASE + DRM_TEGRA_GET_SYNCPT, struct drm_tegra_get_syncpt)
 #define DRM_IOCTL_TEGRA_SUBMIT DRM_IOWR(DRM_COMMAND_BASE + DRM_TEGRA_SUBMIT, struct drm_tegra_submit)
 #define DRM_IOCTL_TEGRA_GET_SYNCPT_BASE DRM_IOWR(DRM_COMMAND_BASE + DRM_TEGRA_GET_SYNCPT_BASE, struct drm_tegra_get_syncpt_base)
+#define DRM_IOCTL_TEGRA_GEM_SET_TILING DRM_IOWR(DRM_COMMAND_BASE + DRM_TEGRA_GEM_SET_TILING, struct drm_tegra_gem_set_tiling)
+#define DRM_IOCTL_TEGRA_GEM_GET_TILING DRM_IOWR(DRM_COMMAND_BASE + DRM_TEGRA_GEM_GET_TILING, struct drm_tegra_gem_get_tiling)
 
 #endif