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drm/i915: Add new GET_PIPE_FROM_CRTC_ID ioctl.

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This allows userlevel code to discover the pipe number corresponding
to a given CRTC ID. This is necessary for doing pipe-specific
operations such as waiting for vblank on a given CRTC.  Failure to use
the right pipe mapping can result in GPU hangs, or at least failure
to actually sync to vblank.

Signed-off-by: Carl Worth <cworth@cworth.org>
[anholt: Style touchups from review]
Signed-off-by: Eric Anholt <eric@anholt.net>
This commit is contained in:
Carl Worth 2009-04-29 14:43:54 -07:00 committed by Eric Anholt
parent 9d2949a4cd
commit 08d7b3d1ed
4 changed files with 44 additions and 0 deletions
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1
drivers/gpu/drm/i915/i915_dma.c
View File

@ -1358,6 +1358,7 @@ struct drm_ioctl_desc i915_ioctls[] = {
DRM_IOCTL_DEF(DRM_I915_GEM_SET_TILING, i915_gem_set_tiling, 0),
DRM_IOCTL_DEF(DRM_I915_GEM_GET_TILING, i915_gem_get_tiling, 0),
DRM_IOCTL_DEF(DRM_I915_GEM_GET_APERTURE, i915_gem_get_aperture_ioctl, 0),
DRM_IOCTL_DEF(DRM_I915_GET_PIPE_FROM_CRTC_ID, intel_get_pipe_from_crtc_id, 0),
};
int i915_max_ioctl = DRM_ARRAY_SIZE(i915_ioctls);

31
drivers/gpu/drm/i915/intel_display.c
View File

@ -1804,6 +1804,37 @@ static void intel_crtc_init(struct drm_device *dev, int pipe)
}
}
int intel_get_pipe_from_crtc_id(struct drm_device *dev, void *data,
struct drm_file *file_priv)
{
drm_i915_private_t *dev_priv = dev->dev_private;
struct drm_i915_get_pipe_from_crtc_id *pipe_from_crtc_id = data;
struct drm_crtc *crtc = NULL;
int pipe = -1;
if (!dev_priv) {
DRM_ERROR("called with no initialization\n");
return -EINVAL;
}
list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
if (crtc->base.id == pipe_from_crtc_id->crtc_id) {
pipe = intel_crtc->pipe;
break;
}
}
if (pipe == -1) {
DRM_ERROR("no such CRTC id\n");
return -EINVAL;
}
pipe_from_crtc_id->pipe = pipe;
return 0;
}
struct drm_crtc *intel_get_crtc_from_pipe(struct drm_device *dev, int pipe)
{
struct drm_crtc *crtc = NULL;

2
drivers/gpu/drm/i915/intel_drv.h
View File

@ -125,6 +125,8 @@ extern struct drm_encoder *intel_best_encoder(struct drm_connector *connector);
extern struct drm_display_mode *intel_crtc_mode_get(struct drm_device *dev,
struct drm_crtc *crtc);
int intel_get_pipe_from_crtc_id(struct drm_device *dev, void *data,
struct drm_file *file_priv);
extern void intel_wait_for_vblank(struct drm_device *dev);
extern struct drm_crtc *intel_get_crtc_from_pipe(struct drm_device *dev, int pipe);
extern struct drm_crtc *intel_get_load_detect_pipe(struct intel_output *intel_output,

10
include/drm/i915_drm.h
View File

@ -184,6 +184,7 @@ typedef struct _drm_i915_sarea {
#define DRM_I915_GEM_GET_TILING 0x22
#define DRM_I915_GEM_GET_APERTURE 0x23
#define DRM_I915_GEM_MMAP_GTT 0x24
#define DRM_I915_GET_PIPE_FROM_CRTC_ID 0x25
#define DRM_IOCTL_I915_INIT DRM_IOW( DRM_COMMAND_BASE + DRM_I915_INIT, drm_i915_init_t)
#define DRM_IOCTL_I915_FLUSH DRM_IO ( DRM_COMMAND_BASE + DRM_I915_FLUSH)
@ -219,6 +220,7 @@ typedef struct _drm_i915_sarea {
#define DRM_IOCTL_I915_GEM_SET_TILING DRM_IOWR (DRM_COMMAND_BASE + DRM_I915_GEM_SET_TILING, struct drm_i915_gem_set_tiling)
#define DRM_IOCTL_I915_GEM_GET_TILING DRM_IOWR (DRM_COMMAND_BASE + DRM_I915_GEM_GET_TILING, struct drm_i915_gem_get_tiling)
#define DRM_IOCTL_I915_GEM_GET_APERTURE DRM_IOR (DRM_COMMAND_BASE + DRM_I915_GEM_GET_APERTURE, struct drm_i915_gem_get_aperture)
#define DRM_IOCTL_I915_GET_PIPE_FROM_CRTC_ID DRM_IOWR(DRM_COMMAND_BASE + DRM_I915_GET_PIPE_FROM_CRTC_ID, struct drm_intel_get_pipe_from_crtc_id)
/* Allow drivers to submit batchbuffers directly to hardware, relying
* on the security mechanisms provided by hardware.
@ -657,4 +659,12 @@ struct drm_i915_gem_get_aperture {
__u64 aper_available_size;
};
struct drm_i915_get_pipe_from_crtc_id {
/** ID of CRTC being requested **/
__u32 crtc_id;
/** pipe of requested CRTC **/
__u32 pipe;
};
#endif /* _I915_DRM_H_ */