summaryrefslogtreecommitdiffstats
path: root/include/drm/drmP.h
diff options
context:
space:
mode:
authorLespiau, Damien <damien.lespiau@intel.com>2014-03-24 15:53:08 +0000
committerDave Airlie <airlied@redhat.com>2014-03-28 12:56:59 +1000
commit1414b76c1e76fb32f4cf0df7ea54f129789e445f (patch)
tree6a12c66b2624a03bd67185d407b9c882b65a8e71 /include/drm/drmP.h
parent90bde571ad194adb039cb92a11a5b346f15eb610 (diff)
downloadop-kernel-dev-1414b76c1e76fb32f4cf0df7ea54f129789e445f.zip
op-kernel-dev-1414b76c1e76fb32f4cf0df7ea54f129789e445f.tar.gz
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.h57
1 files changed, 27 insertions, 30 deletions
diff --git a/include/drm/drmP.h b/include/drm/drmP.h
index daac00a..47f956e 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,
OpenPOWER on IntegriCloud