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drm: Add a debug node for vblank state.

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Signed-off-by: Eric Anholt <eric@anholt.net>
Signed-off-by: Dave Airlie <airlied@linux.ie>
This commit is contained in:
Eric Anholt
2008-12-19 17:23:38 -08:00
committed by Dave Airlie
parent f51c5b6e62
commit fede5c91c4
3 changed files with 73 additions and 0 deletions
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63
drivers/gpu/drm/drm_proc.c
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@@ -49,6 +49,8 @@ static int drm_queues_info(char *buf, char **start, off_t offset,
int request, int *eof, void *data);
static int drm_bufs_info(char *buf, char **start, off_t offset,
int request, int *eof, void *data);
static int drm_vblank_info(char *buf, char **start, off_t offset,
int request, int *eof, void *data);
static int drm_gem_name_info(char *buf, char **start, off_t offset,
int request, int *eof, void *data);
static int drm_gem_object_info(char *buf, char **start, off_t offset,
@@ -72,6 +74,7 @@ static struct drm_proc_list {
{"clients", drm_clients_info, 0},
{"queues", drm_queues_info, 0},
{"bufs", drm_bufs_info, 0},
{"vblank", drm_vblank_info, 0},
{"gem_names", drm_gem_name_info, DRIVER_GEM},
{"gem_objects", drm_gem_object_info, DRIVER_GEM},
#if DRM_DEBUG_CODE
@@ -457,6 +460,66 @@ static int drm_bufs_info(char *buf, char **start, off_t offset, int request,
return ret;
}
/**
* Called when "/proc/dri/.../vblank" is read.
*
* \param buf output buffer.
* \param start start of output data.
* \param offset requested start offset.
* \param request requested number of bytes.
* \param eof whether there is no more data to return.
* \param data private data.
* \return number of written bytes.
*/
static int drm__vblank_info(char *buf, char **start, off_t offset, int request,
int *eof, void *data)
{
struct drm_minor *minor = (struct drm_minor *) data;
struct drm_device *dev = minor->dev;
int len = 0;
int crtc;
if (offset > DRM_PROC_LIMIT) {
*eof = 1;
return 0;
}
*start = &buf[offset];
*eof = 0;
for (crtc = 0; crtc < dev->num_crtcs; crtc++) {
DRM_PROC_PRINT("CRTC %d enable: %d\n",
crtc, atomic_read(&dev->vblank_refcount[crtc]));
DRM_PROC_PRINT("CRTC %d counter: %d\n",
crtc, drm_vblank_count(dev, crtc));
DRM_PROC_PRINT("CRTC %d last wait: %d\n",
crtc, dev->last_vblank_wait[crtc]);
DRM_PROC_PRINT("CRTC %d in modeset: %d\n",
crtc, dev->vblank_inmodeset[crtc]);
}
if (len > request + offset)
return request;
*eof = 1;
return len - offset;
}
/**
* Simply calls _vblank_info() while holding the drm_device::struct_mutex lock.
*/
static int drm_vblank_info(char *buf, char **start, off_t offset, int request,
int *eof, void *data)
{
struct drm_minor *minor = (struct drm_minor *) data;
struct drm_device *dev = minor->dev;
int ret;
mutex_lock(&dev->struct_mutex);
ret = drm__vblank_info(buf, start, offset, request, eof, data);
mutex_unlock(&dev->struct_mutex);
return ret;
}
/**
* Called when "/proc/dri/.../clients" is read.
*