Release 4.12 include/drm/drm_mode_config.h
/*
* Copyright (c) 2016 Intel Corporation
*
* Permission to use, copy, modify, distribute, and sell this software and its
* documentation for any purpose is hereby granted without fee, provided that
* the above copyright notice appear in all copies and that both that copyright
* notice and this permission notice appear in supporting documentation, and
* that the name of the copyright holders not be used in advertising or
* publicity pertaining to distribution of the software without specific,
* written prior permission. The copyright holders make no representations
* about the suitability of this software for any purpose. It is provided "as
* is" without express or implied warranty.
*
* THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
* EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
* DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
* TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
* OF THIS SOFTWARE.
*/
#ifndef __DRM_MODE_CONFIG_H__
#define __DRM_MODE_CONFIG_H__
#include <linux/mutex.h>
#include <linux/types.h>
#include <linux/idr.h>
#include <linux/workqueue.h>
#include <drm/drm_modeset_lock.h>
struct drm_file;
struct drm_device;
struct drm_atomic_state;
struct drm_mode_fb_cmd2;
struct drm_format_info;
/**
* struct drm_mode_config_funcs - basic driver provided mode setting functions
*
* Some global (i.e. not per-CRTC, connector, etc) mode setting functions that
* involve drivers.
*/
struct drm_mode_config_funcs {
/**
* @fb_create:
*
* Create a new framebuffer object. The core does basic checks on the
* requested metadata, but most of that is left to the driver. See
* &struct drm_mode_fb_cmd2 for details.
*
* If the parameters are deemed valid and the backing storage objects in
* the underlying memory manager all exist, then the driver allocates
* a new &drm_framebuffer structure, subclassed to contain
* driver-specific information (like the internal native buffer object
* references). It also needs to fill out all relevant metadata, which
* should be done by calling drm_helper_mode_fill_fb_struct().
*
* The initialization is finalized by calling drm_framebuffer_init(),
* which registers the framebuffer and makes it accessible to other
* threads.
*
* RETURNS:
*
* A new framebuffer with an initial reference count of 1 or a negative
* error code encoded with ERR_PTR().
*/
struct drm_framebuffer *(*fb_create)(struct drm_device *dev,
struct drm_file *file_priv,
const struct drm_mode_fb_cmd2 *mode_cmd);
/**
* @get_format_info:
*
* Allows a driver to return custom format information for special
* fb layouts (eg. ones with auxiliary compression control planes).
*
* RETURNS:
*
* The format information specific to the given fb metadata, or
* NULL if none is found.
*/
const struct drm_format_info *(*get_format_info)(const struct drm_mode_fb_cmd2 *mode_cmd);
/**
* @output_poll_changed:
*
* Callback used by helpers to inform the driver of output configuration
* changes.
*
* Drivers implementing fbdev emulation with the helpers can call
* drm_fb_helper_hotplug_changed from this hook to inform the fbdev
* helper of output changes.
*
* FIXME:
*
* Except that there's no vtable for device-level helper callbacks
* there's no reason this is a core function.
*/
void (*output_poll_changed)(struct drm_device *dev);
/**
* @atomic_check:
*
* This is the only hook to validate an atomic modeset update. This
* function must reject any modeset and state changes which the hardware
* or driver doesn't support. This includes but is of course not limited
* to:
*
* - Checking that the modes, framebuffers, scaling and placement
* requirements and so on are within the limits of the hardware.
*
* - Checking that any hidden shared resources are not oversubscribed.
* This can be shared PLLs, shared lanes, overall memory bandwidth,
* display fifo space (where shared between planes or maybe even
* CRTCs).
*
* - Checking that virtualized resources exported to userspace are not
* oversubscribed. For various reasons it can make sense to expose
* more planes, crtcs or encoders than which are physically there. One
* example is dual-pipe operations (which generally should be hidden
* from userspace if when lockstepped in hardware, exposed otherwise),
* where a plane might need 1 hardware plane (if it's just on one
* pipe), 2 hardware planes (when it spans both pipes) or maybe even
* shared a hardware plane with a 2nd plane (if there's a compatible
* plane requested on the area handled by the other pipe).
*
* - Check that any transitional state is possible and that if
* requested, the update can indeed be done in the vblank period
* without temporarily disabling some functions.
*
* - Check any other constraints the driver or hardware might have.
*
* - This callback also needs to correctly fill out the &drm_crtc_state
* in this update to make sure that drm_atomic_crtc_needs_modeset()
* reflects the nature of the possible update and returns true if and
* only if the update cannot be applied without tearing within one
* vblank on that CRTC. The core uses that information to reject
* updates which require a full modeset (i.e. blanking the screen, or
* at least pausing updates for a substantial amount of time) if
* userspace has disallowed that in its request.
*
* - The driver also does not need to repeat basic input validation
* like done for the corresponding legacy entry points. The core does
* that before calling this hook.
*
* See the documentation of @atomic_commit for an exhaustive list of
* error conditions which don't have to be checked at the in this
* callback.
*
* See the documentation for &struct drm_atomic_state for how exactly
* an atomic modeset update is described.
*
* Drivers using the atomic helpers can implement this hook using
* drm_atomic_helper_check(), or one of the exported sub-functions of
* it.
*
* RETURNS:
*
* 0 on success or one of the below negative error codes:
*
* - -EINVAL, if any of the above constraints are violated.
*
* - -EDEADLK, when returned from an attempt to acquire an additional
* &drm_modeset_lock through drm_modeset_lock().
*
* - -ENOMEM, if allocating additional state sub-structures failed due
* to lack of memory.
*
* - -EINTR, -EAGAIN or -ERESTARTSYS, if the IOCTL should be restarted.
* This can either be due to a pending signal, or because the driver
* needs to completely bail out to recover from an exceptional
* situation like a GPU hang. From a userspace point all errors are
* treated equally.
*/
int (*atomic_check)(struct drm_device *dev,
struct drm_atomic_state *state);
/**
* @atomic_commit:
*
* This is the only hook to commit an atomic modeset update. The core
* guarantees that @atomic_check has been called successfully before
* calling this function, and that nothing has been changed in the
* interim.
*
* See the documentation for &struct drm_atomic_state for how exactly
* an atomic modeset update is described.
*
* Drivers using the atomic helpers can implement this hook using
* drm_atomic_helper_commit(), or one of the exported sub-functions of
* it.
*
* Nonblocking commits (as indicated with the nonblock parameter) must
* do any preparatory work which might result in an unsuccessful commit
* in the context of this callback. The only exceptions are hardware
* errors resulting in -EIO. But even in that case the driver must
* ensure that the display pipe is at least running, to avoid
* compositors crashing when pageflips don't work. Anything else,
* specifically committing the update to the hardware, should be done
* without blocking the caller. For updates which do not require a
* modeset this must be guaranteed.
*
* The driver must wait for any pending rendering to the new
* framebuffers to complete before executing the flip. It should also
* wait for any pending rendering from other drivers if the underlying
* buffer is a shared dma-buf. Nonblocking commits must not wait for
* rendering in the context of this callback.
*
* An application can request to be notified when the atomic commit has
* completed. These events are per-CRTC and can be distinguished by the
* CRTC index supplied in &drm_event to userspace.
*
* The drm core will supply a &struct drm_event in each CRTC's
* &drm_crtc_state.event. See the documentation for
* &drm_crtc_state.event for more details about the precise semantics of
* this event.
*
* NOTE:
*
* Drivers are not allowed to shut down any display pipe successfully
* enabled through an atomic commit on their own. Doing so can result in
* compositors crashing if a page flip is suddenly rejected because the
* pipe is off.
*
* RETURNS:
*
* 0 on success or one of the below negative error codes:
*
* - -EBUSY, if a nonblocking updated is requested and there is
* an earlier updated pending. Drivers are allowed to support a queue
* of outstanding updates, but currently no driver supports that.
* Note that drivers must wait for preceding updates to complete if a
* synchronous update is requested, they are not allowed to fail the
* commit in that case.
*
* - -ENOMEM, if the driver failed to allocate memory. Specifically
* this can happen when trying to pin framebuffers, which must only
* be done when committing the state.
*
* - -ENOSPC, as a refinement of the more generic -ENOMEM to indicate
* that the driver has run out of vram, iommu space or similar GPU
* address space needed for framebuffer.
*
* - -EIO, if the hardware completely died.
*
* - -EINTR, -EAGAIN or -ERESTARTSYS, if the IOCTL should be restarted.
* This can either be due to a pending signal, or because the driver
* needs to completely bail out to recover from an exceptional
* situation like a GPU hang. From a userspace point of view all errors are
* treated equally.
*
* This list is exhaustive. Specifically this hook is not allowed to
* return -EINVAL (any invalid requests should be caught in
* @atomic_check) or -EDEADLK (this function must not acquire
* additional modeset locks).
*/
int (*atomic_commit)(struct drm_device *dev,
struct drm_atomic_state *state,
bool nonblock);
/**
* @atomic_state_alloc:
*
* This optional hook can be used by drivers that want to subclass struct
* &drm_atomic_state to be able to track their own driver-private global
* state easily. If this hook is implemented, drivers must also
* implement @atomic_state_clear and @atomic_state_free.
*
* RETURNS:
*
* A new &drm_atomic_state on success or NULL on failure.
*/
struct drm_atomic_state *(*atomic_state_alloc)(struct drm_device *dev);
/**
* @atomic_state_clear:
*
* This hook must clear any driver private state duplicated into the
* passed-in &drm_atomic_state. This hook is called when the caller
* encountered a &drm_modeset_lock deadlock and needs to drop all
* already acquired locks as part of the deadlock avoidance dance
* implemented in drm_modeset_backoff().
*
* Any duplicated state must be invalidated since a concurrent atomic
* update might change it, and the drm atomic interfaces always apply
* updates as relative changes to the current state.
*
* Drivers that implement this must call drm_atomic_state_default_clear()
* to clear common state.
*/
void (*atomic_state_clear)(struct drm_atomic_state *state);
/**
* @atomic_state_free:
*
* This hook needs driver private resources and the &drm_atomic_state
* itself. Note that the core first calls drm_atomic_state_clear() to
* avoid code duplicate between the clear and free hooks.
*
* Drivers that implement this must call
* drm_atomic_state_default_release() to release common resources.
*/
void (*atomic_state_free)(struct drm_atomic_state *state);
};
/**
* struct drm_mode_config - Mode configuration control structure
* @min_width: minimum pixel width on this device
* @min_height: minimum pixel height on this device
* @max_width: maximum pixel width on this device
* @max_height: maximum pixel height on this device
* @funcs: core driver provided mode setting functions
* @fb_base: base address of the framebuffer
* @poll_enabled: track polling support for this device
* @poll_running: track polling status for this device
* @delayed_event: track delayed poll uevent deliver for this device
* @output_poll_work: delayed work for polling in process context
* @preferred_depth: preferred RBG pixel depth, used by fb helpers
* @prefer_shadow: hint to userspace to prefer shadow-fb rendering
* @cursor_width: hint to userspace for max cursor width
* @cursor_height: hint to userspace for max cursor height
* @helper_private: mid-layer private data
*
* Core mode resource tracking structure. All CRTC, encoders, and connectors
* enumerated by the driver are added here, as are global properties. Some
* global restrictions are also here, e.g. dimension restrictions.
*/
struct drm_mode_config {
/**
* @mutex:
*
* This is the big scary modeset BKL which protects everything that
* isn't protect otherwise. Scope is unclear and fuzzy, try to remove
* anything from under it's protection and move it into more well-scoped
* locks.
*
* The one important thing this protects is the use of @acquire_ctx.
*/
struct mutex mutex;
/**
* @connection_mutex:
*
* This protects connector state and the connector to encoder to CRTC
* routing chain.
*
* For atomic drivers specifically this protects &drm_connector.state.
*/
struct drm_modeset_lock connection_mutex;
/**
* @acquire_ctx:
*
* Global implicit acquire context used by atomic drivers for legacy
* IOCTLs. Deprecated, since implicit locking contexts make it
* impossible to use driver-private &struct drm_modeset_lock. Users of
* this must hold @mutex.
*/
struct drm_modeset_acquire_ctx *acquire_ctx;
/**
* @idr_mutex:
*
* Mutex for KMS ID allocation and management. Protects both @crtc_idr
* and @tile_idr.
*/
struct mutex idr_mutex;
/**
* @crtc_idr:
*
* Main KMS ID tracking object. Use this idr for all IDs, fb, crtc,
* connector, modes - just makes life easier to have only one.
*/
struct idr crtc_idr;
/**
* @tile_idr:
*
* Use this idr for allocating new IDs for tiled sinks like use in some
* high-res DP MST screens.
*/
struct idr tile_idr;
/** @fb_lock: Mutex to protect fb the global @fb_list and @num_fb. */
struct mutex fb_lock;
/** @num_fb: Number of entries on @fb_list. */
int num_fb;
/** @fb_list: List of all &struct drm_framebuffer. */
struct list_head fb_list;
/**
* @connector_list_lock: Protects @num_connector and
* @connector_list.
*/
spinlock_t connector_list_lock;
/**
* @num_connector: Number of connectors on this device. Protected by
* @connector_list_lock.
*/
int num_connector;
/**
* @connector_ida: ID allocator for connector indices.
*/
struct ida connector_ida;
/**
* @connector_list:
*
* List of connector objects linked with &drm_connector.head. Protected
* by @connector_list_lock. Only use drm_for_each_connector_iter() and
* &struct drm_connector_list_iter to walk this list.
*/
struct list_head connector_list;
/**
* @num_encoder:
*
* Number of encoders on this device. This is invariant over the
* lifetime of a device and hence doesn't need any locks.
*/
int num_encoder;
/**
* @encoder_list:
*
* List of encoder objects linked with &drm_encoder.head. This is
* invariant over the lifetime of a device and hence doesn't need any
* locks.
*/
struct list_head encoder_list;
/**
* @num_overlay_plane:
*
* Number of overlay planes on this device, excluding primary and cursor
* planes.
*
* Track number of overlay planes separately from number of total
* planes. By default we only advertise overlay planes to userspace; if
* userspace sets the "universal plane" capability bit, we'll go ahead
* and expose all planes. This is invariant over the lifetime of a
* device and hence doesn't need any locks.
*/
int num_overlay_plane;
/**
* @num_total_plane:
*
* Number of universal (i.e. with primary/curso) planes on this device.
* This is invariant over the lifetime of a device and hence doesn't
* need any locks.
*/
int num_total_plane;
/**
* @plane_list:
*
* List of plane objects linked with &drm_plane.head. This is invariant
* over the lifetime of a device and hence doesn't need any locks.
*/
struct list_head plane_list;
/**
* @num_crtc:
*
* Number of CRTCs on this device linked with &drm_crtc.head. This is invariant over the lifetime
* of a device and hence doesn't need any locks.
*/
int num_crtc;
/**
* @crtc_list:
*
* List of CRTC objects linked with &drm_crtc.head. This is invariant
* over the lifetime of a device and hence doesn't need any locks.
*/
struct list_head crtc_list;
/**
* @property_list:
*
* List of property type objects linked with &drm_property.head. This is
* invariant over the lifetime of a device and hence doesn't need any
* locks.
*/
struct list_head property_list;
int min_width, min_height;
int max_width, max_height;
const struct drm_mode_config_funcs *funcs;
resource_size_t fb_base;
/* output poll support */
bool poll_enabled;
bool poll_running;
bool delayed_event;
struct delayed_work output_poll_work;
/**
* @blob_lock:
*
* Mutex for blob property allocation and management, protects
* @property_blob_list and &drm_file.blobs.
*/
struct mutex blob_lock;
/**
* @property_blob_list:
*
* List of all the blob property objects linked with
* &drm_property_blob.head. Protected by @blob_lock.
*/
struct list_head property_blob_list;
/* pointers to standard properties */
/**
* @edid_property: Default connector property to hold the EDID of the
* currently connected sink, if any.
*/
struct drm_property *edid_property;
/**
* @dpms_property: Default connector property to control the
* connector's DPMS state.
*/
struct drm_property *dpms_property;
/**
* @path_property: Default connector property to hold the DP MST path
* for the port.
*/
struct drm_property *path_property;
/**
* @tile_property: Default connector property to store the tile
* position of a tiled screen, for sinks which need to be driven with
* multiple CRTCs.
*/
struct drm_property *tile_property;
/**
* @link_status_property: Default connector property for link status
* of a connector
*/
struct drm_property *link_status_property;
/**
* @plane_type_property: Default plane property to differentiate
* CURSOR, PRIMARY and OVERLAY legacy uses of planes.
*/
struct drm_property *plane_type_property;
/**
* @prop_src_x: Default atomic plane property for the plane source
* position in the connected &drm_framebuffer.
*/
struct drm_property *prop_src_x;
/**
* @prop_src_y: Default atomic plane property for the plane source
* position in the connected &drm_framebuffer.
*/
struct drm_property *prop_src_y;
/**
* @prop_src_w: Default atomic plane property for the plane source
* position in the connected &drm_framebuffer.
*/
struct drm_property *prop_src_w;
/**
* @prop_src_h: Default atomic plane property for the plane source
* position in the connected &drm_framebuffer.
*/
struct drm_property *prop_src_h;
/**
* @prop_crtc_x: Default atomic plane property for the plane destination
* position in the &drm_crtc is is being shown on.
*/
struct drm_property *prop_crtc_x;
/**
* @prop_crtc_y: Default atomic plane property for the plane destination
* position in the &drm_crtc is is being shown on.
*/
struct drm_property *prop_crtc_y;
/**
* @prop_crtc_w: Default atomic plane property for the plane destination
* position in the &drm_crtc is is being shown on.
*/
struct drm_property *prop_crtc_w;
/**
* @prop_crtc_h: Default atomic plane property for the plane destination
* position in the &drm_crtc is is being shown on.
*/
struct drm_property *prop_crtc_h;
/**
* @prop_fb_id: Default atomic plane property to specify the
* &drm_framebuffer.
*/
struct drm_property *prop_fb_id;
/**
* @prop_in_fence_fd: Sync File fd representing the incoming fences
* for a Plane.
*/
struct drm_property *prop_in_fence_fd;
/**
* @prop_out_fence_ptr: Sync File fd pointer representing the
* outgoing fences for a CRTC. Userspace should provide a pointer to a
* value of type s32, and then cast that pointer to u64.
*/
struct drm_property *prop_out_fence_ptr;
/**
* @prop_crtc_id: Default atomic plane property to specify the
* &drm_crtc.
*/
struct drm_property *prop_crtc_id;
/**
* @prop_active: Default atomic CRTC property to control the active
* state, which is the simplified implementation for DPMS in atomic
* drivers.
*/
struct drm_property *prop_active;
/**
* @prop_mode_id: Default atomic CRTC property to set the mode for a
* CRTC. A 0 mode implies that the CRTC is entirely disabled - all
* connectors must be of and active must be set to disabled, too.
*/
struct drm_property *prop_mode_id;
/**
* @dvi_i_subconnector_property: Optional DVI-I property to
* differentiate between analog or digital mode.
*/
struct drm_property *dvi_i_subconnector_property;
/**
* @dvi_i_select_subconnector_property: Optional DVI-I property to
* select between analog or digital mode.
*/
struct drm_property *dvi_i_select_subconnector_property;
/**
* @tv_subconnector_property: Optional TV property to differentiate
* between different TV connector types.
*/
struct drm_property *tv_subconnector_property;
/**
* @tv_select_subconnector_property: Optional TV property to select
* between different TV connector types.
*/
struct drm_property *tv_select_subconnector_property;
/**
* @tv_mode_property: Optional TV property to select
* the output TV mode.
*/
struct drm_property *tv_mode_property;
/**
* @tv_left_margin_property: Optional TV property to set the left
* margin.
*/
struct drm_property *tv_left_margin_property;
/**
* @tv_right_margin_property: Optional TV property to set the right
* margin.
*/
struct drm_property *tv_right_margin_property;
/**
* @tv_top_margin_property: Optional TV property to set the right
* margin.
*/
struct drm_property *tv_top_margin_property;
/**
* @tv_bottom_margin_property: Optional TV property to set the right
* margin.
*/
struct drm_property *tv_bottom_margin_property;
/**
* @tv_brightness_property: Optional TV property to set the
* brightness.
*/
struct drm_property *tv_brightness_property;
/**
* @tv_contrast_property: Optional TV property to set the
* contrast.
*/
struct drm_property *tv_contrast_property;
/**
* @tv_flicker_reduction_property: Optional TV property to control the
* flicker reduction mode.
*/
struct drm_property *tv_flicker_reduction_property;
/**
* @tv_overscan_property: Optional TV property to control the overscan
* setting.
*/
struct drm_property *tv_overscan_property;
/**
* @tv_saturation_property: Optional TV property to set the
* saturation.
*/
struct drm_property *tv_saturation_property;
/**
* @tv_hue_property: Optional TV property to set the hue.
*/
struct drm_property *tv_hue_property;
/**
* @scaling_mode_property: Optional connector property to control the
* upscaling, mostly used for built-in panels.
*/
struct drm_property *scaling_mode_property;
/**
* @aspect_ratio_property: Optional connector property to control the
* HDMI infoframe aspect ratio setting.
*/
struct drm_property *aspect_ratio_property;
/**
* @degamma_lut_property: Optional CRTC property to set the LUT used to
* convert the framebuffer's colors to linear gamma.
*/
struct drm_property *degamma_lut_property;
/**
* @degamma_lut_size_property: Optional CRTC property for the size of
* the degamma LUT as supported by the driver (read-only).
*/
struct drm_property *degamma_lut_size_property;
/**
* @ctm_property: Optional CRTC property to set the
* matrix used to convert colors after the lookup in the
* degamma LUT.
*/
struct drm_property *ctm_property;
/**
* @gamma_lut_property: Optional CRTC property to set the LUT used to
* convert the colors, after the CTM matrix, to the gamma space of the
* connected screen.
*/
struct drm_property *gamma_lut_property;
/**
* @gamma_lut_size_property: Optional CRTC property for the size of the
* gamma LUT as supported by the driver (read-only).
*/
struct drm_property *gamma_lut_size_property;
/**
* @suggested_x_property: Optional connector property with a hint for
* the position of the output on the host's screen.
*/
struct drm_property *suggested_x_property;
/**
* @suggested_y_property: Optional connector property with a hint for
* the position of the output on the host's screen.
*/
struct drm_property *suggested_y_property;
/* dumb ioctl parameters */
uint32_t preferred_depth, prefer_shadow;
/**
* @async_page_flip: Does this device support async flips on the primary
* plane?
*/
bool async_page_flip;
/**
* @allow_fb_modifiers:
*
* Whether the driver supports fb modifiers in the ADDFB2.1 ioctl call.
*/
bool allow_fb_modifiers;
/* cursor size */
uint32_t cursor_width, cursor_height;
const struct drm_mode_config_helper_funcs *helper_private;
};
void drm_mode_config_init(struct drm_device *dev);
void drm_mode_config_reset(struct drm_device *dev);
void drm_mode_config_cleanup(struct drm_device *dev);
#endif
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