diff options
| author | Lespiau, Damien <damien.lespiau@intel.com> | 2014-03-24 19:53:08 +0400 |
|---|---|---|
| committer | Dave Airlie <airlied@redhat.com> | 2014-03-28 06:56:59 +0400 |
| commit | 1414b76c1e76fb32f4cf0df7ea54f129789e445f (patch) | |
| tree | 6a12c66b2624a03bd67185d407b9c882b65a8e71 /include/drm/drmP.h | |
| parent | 90bde571ad194adb039cb92a11a5b346f15eb610 (diff) | |
| download | linux-1414b76c1e76fb32f4cf0df7ea54f129789e445f.tar.xz | |
drm: Refresh the explanation of debug categories
That comment wasn't super-readable, so I tried to improve it:
- Put the comment before the values it's documenting
- Add a mention to PRIME
- Reword things a bit to be a lighter read
- Add a note about the option to set the debug value at run-time
Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
Diffstat (limited to 'include/drm/drmP.h')
| -rw-r--r-- | include/drm/drmP.h | 57 |
1 files changed, 27 insertions, 30 deletions
diff --git a/include/drm/drmP.h b/include/drm/drmP.h index daac00a93126..47f956ea9d02 100644 --- a/include/drm/drmP.h +++ b/include/drm/drmP.h @@ -88,41 +88,38 @@ struct videomode; #include <drm/drm_hashtab.h> #include <drm/drm_mm.h> -#define DRM_UT_CORE 0x01 -#define DRM_UT_DRIVER 0x02 -#define DRM_UT_KMS 0x04 -#define DRM_UT_PRIME 0x08 /* - * Three debug levels are defined. - * drm_core, drm_driver, drm_kms - * drm_core level can be used in the generic drm code. For example: - * drm_ioctl, drm_mm, drm_memory - * The macro definition of DRM_DEBUG is used. - * DRM_DEBUG(fmt, args...) - * The debug info by using the DRM_DEBUG can be obtained by adding - * the boot option of "drm.debug=1". + * 4 debug categories are defined: + * + * CORE: Used in the generic drm code: drm_ioctl.c, drm_mm.c, drm_memory.c, ... + * This is the category used by the DRM_DEBUG() macro. + * + * DRIVER: Used in the vendor specific part of the driver: i915, radeon, ... + * This is the category used by the DRM_DEBUG_DRIVER() macro. * - * drm_driver level can be used in the specific drm driver. It is used - * to add the debug info related with the drm driver. For example: - * i915_drv, i915_dma, i915_gem, radeon_drv, - * The macro definition of DRM_DEBUG_DRIVER can be used. - * DRM_DEBUG_DRIVER(fmt, args...) - * The debug info by using the DRM_DEBUG_DRIVER can be obtained by - * adding the boot option of "drm.debug=0x02" + * KMS: used in the modesetting code. + * This is the category used by the DRM_DEBUG_KMS() macro. * - * drm_kms level can be used in the KMS code related with specific drm driver. - * It is used to add the debug info related with KMS mode. For example: - * the connector/crtc , - * The macro definition of DRM_DEBUG_KMS can be used. - * DRM_DEBUG_KMS(fmt, args...) - * The debug info by using the DRM_DEBUG_KMS can be obtained by - * adding the boot option of "drm.debug=0x04" + * PRIME: used in the prime code. + * This is the category used by the DRM_DEBUG_PRIME() macro. * - * If we add the boot option of "drm.debug=0x06", we can get the debug info by - * using the DRM_DEBUG_KMS and DRM_DEBUG_DRIVER. - * If we add the boot option of "drm.debug=0x05", we can get the debug info by - * using the DRM_DEBUG_KMS and DRM_DEBUG. + * Enabling verbose debug messages is done through the drm.debug parameter, + * each category being enabled by a bit. + * + * drm.debug=0x1 will enable CORE messages + * drm.debug=0x2 will enable DRIVER messages + * drm.debug=0x3 will enable CORE and DRIVER messages + * ... + * drm.debug=0xf will enable all messages + * + * An interesting feature is that it's possible to enable verbose logging at + * run-time by echoing the debug value in its sysfs node: + * # echo 0xf > /sys/module/drm/parameters/debug */ +#define DRM_UT_CORE 0x01 +#define DRM_UT_DRIVER 0x02 +#define DRM_UT_KMS 0x04 +#define DRM_UT_PRIME 0x08 extern __printf(4, 5) void drm_ut_debug_printk(unsigned int request_level, |