Commit 08d7b3d1 authored by Carl Worth's avatar Carl Worth Committed by Eric Anholt
Browse files

drm/i915: Add new GET_PIPE_FROM_CRTC_ID ioctl. 



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: default avatarCarl Worth <cworth@cworth.org>
[anholt: Style touchups from review]
Signed-off-by: default avatarEric Anholt <eric@anholt.net>
parent 9d2949a4

drivers/gpu/drm/i915/i915_dma.c

+1 −0
Original line number Diff line number Diff line
@@ -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);

drivers/gpu/drm/i915/intel_display.c

+31 −0
Original line number Diff line number Diff line
@@ -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;

drivers/gpu/drm/i915/intel_drv.h

+2 −0
Original line number Diff line number Diff line
@@ -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,

include/drm/i915_drm.h

+10 −0
Original line number Diff line number Diff line
@@ -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_ */

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