DRM: Add the explanation about DRM debug level
Add the explanation about DRM debug level in the drmP header file. This is to explain how/where to use the different DRM debug level. Signed-off-by: Zhao Yakui <yakui.zhao@intel.com> Signed-off-by: Dave Airlie <airlied@redhat.com>
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@ -88,6 +88,37 @@ struct drm_device;
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#define DRM_UT_CORE 0x01
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#define DRM_UT_DRIVER 0x02
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#define DRM_UT_KMS 0x04
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/*
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* Three debug levels are defined.
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* drm_core, drm_driver, drm_kms
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* drm_core level can be used in the generic drm code. For example:
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* drm_ioctl, drm_mm, drm_memory
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* The macro definiton of DRM_DEBUG is used.
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* DRM_DEBUG(fmt, args...)
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* The debug info by using the DRM_DEBUG can be obtained by adding
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* the boot option of "drm.debug=1".
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*
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* drm_driver level can be used in the specific drm driver. It is used
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* to add the debug info related with the drm driver. For example:
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* i915_drv, i915_dma, i915_gem, radeon_drv,
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* The macro definition of DRM_DEBUG_DRIVER can be used.
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* DRM_DEBUG_DRIVER(fmt, args...)
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* The debug info by using the DRM_DEBUG_DRIVER can be obtained by
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* adding the boot option of "drm.debug=0x02"
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*
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* drm_kms level can be used in the KMS code related with specific drm driver.
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* It is used to add the debug info related with KMS mode. For example:
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* the connector/crtc ,
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* The macro definition of DRM_DEBUG_KMS can be used.
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* DRM_DEBUG_KMS(fmt, args...)
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* The debug info by using the DRM_DEBUG_KMS can be obtained by
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* adding the boot option of "drm.debug=0x04"
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*
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* If we add the boot option of "drm.debug=0x06", we can get the debug info by
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* using the DRM_DEBUG_KMS and DRM_DEBUG_DRIVER.
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* If we add the boot option of "drm.debug=0x05", we can get the debug info by
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* using the DRM_DEBUG_KMS and DRM_DEBUG.
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*/
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extern void drm_ut_debug_printk(unsigned int request_level,
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const char *prefix,
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