diff options
Diffstat (limited to 'Documentation/DocBook/drm.tmpl')
| -rw-r--r-- | Documentation/DocBook/drm.tmpl | 78 |
1 files changed, 64 insertions, 14 deletions
diff --git a/Documentation/DocBook/drm.tmpl b/Documentation/DocBook/drm.tmpl index 4ee2304f82f9..f9df3b872c16 100644 --- a/Documentation/DocBook/drm.tmpl +++ b/Documentation/DocBook/drm.tmpl @@ -743,6 +743,10 @@ char *date;</synopsis> These two operations are mandatory for GEM drivers that support DRM PRIME. </para> + <sect4> + <title>DRM PRIME Helper Functions Reference</title> +!Pdrivers/gpu/drm/drm_prime.c PRIME Helpers + </sect4> </sect3> <sect3 id="drm-gem-objects-mapping"> <title>GEM Objects Mapping</title> @@ -978,10 +982,25 @@ int max_width, max_height;</synopsis> If the parameters are deemed valid, drivers then create, initialize and return an instance of struct <structname>drm_framebuffer</structname>. If desired the instance can be embedded in a larger driver-specific - structure. The new instance is initialized with a call to - <function>drm_framebuffer_init</function> which takes a pointer to DRM - frame buffer operations (struct - <structname>drm_framebuffer_funcs</structname>). Frame buffer operations are + structure. Drivers must fill its <structfield>width</structfield>, + <structfield>height</structfield>, <structfield>pitches</structfield>, + <structfield>offsets</structfield>, <structfield>depth</structfield>, + <structfield>bits_per_pixel</structfield> and + <structfield>pixel_format</structfield> fields from the values passed + through the <parameter>drm_mode_fb_cmd2</parameter> argument. They + should call the <function>drm_helper_mode_fill_fb_struct</function> + helper function to do so. + </para> + + <para> + The initailization of the new framebuffer instance is finalized with a + call to <function>drm_framebuffer_init</function> which takes a pointer + to DRM frame buffer operations (struct + <structname>drm_framebuffer_funcs</structname>). Note that this function + publishes the framebuffer and so from this point on it can be accessed + concurrently from other threads. Hence it must be the last step in the + driver's framebuffer initialization sequence. Frame buffer operations + are <itemizedlist> <listitem> <synopsis>int (*create_handle)(struct drm_framebuffer *fb, @@ -1022,16 +1041,16 @@ int max_width, max_height;</synopsis> </itemizedlist> </para> <para> - After initializing the <structname>drm_framebuffer</structname> - instance drivers must fill its <structfield>width</structfield>, - <structfield>height</structfield>, <structfield>pitches</structfield>, - <structfield>offsets</structfield>, <structfield>depth</structfield>, - <structfield>bits_per_pixel</structfield> and - <structfield>pixel_format</structfield> fields from the values passed - through the <parameter>drm_mode_fb_cmd2</parameter> argument. They - should call the <function>drm_helper_mode_fill_fb_struct</function> - helper function to do so. - </para> + The lifetime of a drm framebuffer is controlled with a reference count, + drivers can grab additional references with + <function>drm_framebuffer_reference</function> </para> and drop them + again with <function>drm_framebuffer_unreference</function>. For + driver-private framebuffers for which the last reference is never + dropped (e.g. for the fbdev framebuffer when the struct + <structname>drm_framebuffer</structname> is embedded into the fbdev + helper struct) drivers can manually clean up a framebuffer at module + unload time with + <function>drm_framebuffer_unregister_private</function>. </sect2> <sect2> <title>Output Polling</title> @@ -1043,6 +1062,22 @@ int max_width, max_height;</synopsis> operation. </para> </sect2> + <sect2> + <title>Locking</title> + <para> + Beside some lookup structures with their own locking (which is hidden + behind the interface functions) most of the modeset state is protected + by the <code>dev-<mode_config.lock</code> mutex and additionally + per-crtc locks to allow cursor updates, pageflips and similar operations + to occur concurrently with background tasks like output detection. + Operations which cross domains like a full modeset always grab all + locks. Drivers there need to protect resources shared between crtcs with + additional locking. They also need to be careful to always grab the + relevant crtc locks if a modset functions touches crtc state, e.g. for + load detection (which does only grab the <code>mode_config.lock</code> + to allow concurrent screen updates on live crtcs). + </para> + </sect2> </sect1> <!-- Internals: kms initialization and cleanup --> @@ -1126,6 +1161,12 @@ int max_width, max_height;</synopsis> any new rendering to the frame buffer until the page flip completes. </para> <para> + If a page flip can be successfully scheduled the driver must set the + <code>drm_crtc-<fb</code> field to the new framebuffer pointed to + by <code>fb</code>. This is important so that the reference counting + on framebuffers stays balanced. + </para> + <para> If a page flip is already pending, the <methodname>page_flip</methodname> operation must return -<errorname>EBUSY</errorname>. @@ -1609,6 +1650,10 @@ void intel_crt_init(struct drm_device *dev) make its properties available to applications. </para> </sect2> + <sect2> + <title>KMS API Functions</title> +!Edrivers/gpu/drm/drm_crtc.c + </sect2> </sect1> <!-- Internals: kms helper functions --> @@ -2104,6 +2149,7 @@ void intel_crt_init(struct drm_device *dev) <title>fbdev Helper Functions Reference</title> !Pdrivers/gpu/drm/drm_fb_helper.c fbdev helpers !Edrivers/gpu/drm/drm_fb_helper.c +!Iinclude/drm/drm_fb_helper.h </sect2> <sect2> <title>Display Port Helper Functions Reference</title> @@ -2111,6 +2157,10 @@ void intel_crt_init(struct drm_device *dev) !Iinclude/drm/drm_dp_helper.h !Edrivers/gpu/drm/drm_dp_helper.c </sect2> + <sect2> + <title>EDID Helper Functions Reference</title> +!Edrivers/gpu/drm/drm_edid.c + </sect2> </sect1> <!-- Internals: vertical blanking --> |
