/* SPDX-License-Identifier: GPL-2.0 or MIT */
#ifndef _DRM_CLIENT_H_
#define _DRM_CLIENT_H_
#include <linux/iosys-map.h>
#include <linux/lockdep.h>
#include <linux/mutex.h>
#include <linux/types.h>
#include <drm/drm_connector.h>
#include <drm/drm_crtc.h>
struct drm_client_dev;
struct drm_device;
struct drm_file;
struct drm_framebuffer;
struct drm_gem_object;
struct drm_minor;
struct module;
/**
* struct drm_client_funcs - DRM client callbacks
*/
struct drm_client_funcs {
/**
* @ owner : The module owner
*/
struct module *owner;
/**
* @ unregister :
*
* Called when & drm_device is unregistered . The client should respond by
* releasing its resources using drm_client_release ( ) .
*
* This callback is optional .
*/
void (*unregister)(struct drm_client_dev *client);
/**
* @ restore :
*
* Called on drm_lastclose ( ) . The first client instance in the list that
* returns zero gets the privilege to restore and no more clients are
* called . This callback is not called after @ unregister has been called .
*
* Note that the core does not guarantee exclusion against concurrent
* drm_open ( ) . Clients need to ensure this themselves , for example by
* using drm_master_internal_acquire ( ) and
* drm_master_internal_release ( ) .
*
* This callback is optional .
*/
int (*restore)(struct drm_client_dev *client);
/**
* @ hotplug :
*
* Called on drm_kms_helper_hotplug_event ( ) .
* This callback is not called after @ unregister has been called .
*
* This callback is optional .
*/
int (*hotplug)(struct drm_client_dev *client);
/**
* @ suspend :
*
* Called when suspending the device .
*
* This callback is optional .
*
* FIXME : Some callers hold the console lock when invoking this
* function . This interferes with fbdev emulation , which
* also tries to acquire the lock . Push the console lock
* into the callback and remove ' holds_console_lock ' .
*/
int (*suspend)(struct drm_client_dev *client, bool holds_console_lock);
/**
* @ resume :
*
* Called when resuming the device from suspend .
*
* This callback is optional .
*
* FIXME : Some callers hold the console lock when invoking this
* function . This interferes with fbdev emulation , which
* also tries to acquire the lock . Push the console lock
* into the callback and remove ' holds_console_lock ' .
*/
int (*resume)(struct drm_client_dev *client, bool holds_console_lock);
};
/**
* struct drm_client_dev - DRM client instance
*/
struct drm_client_dev {
/**
* @ dev : DRM device
*/
struct drm_device *dev;
/**
* @ name : Name of the client .
*/
const char *name;
/**
* @ list :
*
* List of all clients of a DRM device , linked into
* & drm_device . clientlist . Protected by & drm_device . clientlist_mutex .
*/
struct list_head list;
/**
* @ funcs : DRM client functions ( optional )
*/
const struct drm_client_funcs *funcs;
/**
* @ file : DRM file
*/
struct drm_file *file;
/**
* @ modeset_mutex : Protects @ modesets .
*/
struct mutex modeset_mutex;
/**
* @ modesets : CRTC configurations
*/
struct drm_mode_set *modesets;
/**
* @ suspended :
*
* The client has been suspended .
*/
bool suspended;
/**
* @ hotplug_pending :
*
* A hotplug event has been received while the client was suspended .
* Try again on resume .
*/
bool hotplug_pending;
/**
* @ hotplug_failed :
*
* Set by client hotplug helpers if the hotplugging failed
* before . It is usually not tried again .
*/
bool hotplug_failed;
};
int drm_client_init(struct drm_device *dev, struct drm_client_dev *client,
const char *name, const struct drm_client_funcs *funcs);
void drm_client_release(struct drm_client_dev *client);
void drm_client_register(struct drm_client_dev *client);
/**
* struct drm_client_buffer - DRM client buffer
*/
struct drm_client_buffer {
/**
* @ client : DRM client
*/
struct drm_client_dev *client;
/**
* @ pitch : Buffer pitch
*/
u32 pitch;
/**
* @ gem : GEM object backing this buffer
*
* FIXME : The dependency on GEM here isn ' t required , we could
* convert the driver handle to a dma - buf instead and use the
* backend - agnostic dma - buf vmap support instead . This would
* require that the handle2fd prime ioctl is reworked to pull the
* fd_install step out of the driver backend hooks , to make that
* final step optional for internal users .
*/
struct drm_gem_object *gem;
/**
* @ map : Virtual address for the buffer
*/
struct iosys_map map;
/**
* @ fb : DRM framebuffer
*/
struct drm_framebuffer *fb;
};
struct drm_client_buffer *
drm_client_framebuffer_create(struct drm_client_dev *client, u32 width, u32 height, u32 format);
void drm_client_framebuffer_delete(struct drm_client_buffer *buffer);
int drm_client_framebuffer_flush(struct drm_client_buffer *buffer, struct drm_rect *rect);
int drm_client_buffer_vmap_local(struct drm_client_buffer *buffer,
struct iosys_map *map_copy);
void drm_client_buffer_vunmap_local(struct drm_client_buffer *buffer);
int drm_client_buffer_vmap(struct drm_client_buffer *buffer,
struct iosys_map *map);
void drm_client_buffer_vunmap(struct drm_client_buffer *buffer);
int drm_client_modeset_create(struct drm_client_dev *client);
void drm_client_modeset_free(struct drm_client_dev *client);
int drm_client_modeset_probe(struct drm_client_dev *client, unsigned int width, unsigned int height);
bool drm_client_rotation(struct drm_mode_set *modeset, unsigned int *rotation);
int drm_client_modeset_check(struct drm_client_dev *client);
int drm_client_modeset_commit_locked(struct drm_client_dev *client);
int drm_client_modeset_commit(struct drm_client_dev *client);
int drm_client_modeset_dpms(struct drm_client_dev *client, int mode);
/**
* drm_client_for_each_modeset ( ) - Iterate over client modesets
* @ modeset : & drm_mode_set loop cursor
* @ client : DRM client
*/
#define drm_client_for_each_modeset(modeset, client) \
for (({ lockdep_assert_held(&(client)->modeset_mutex); }), \
modeset = (client)->modesets; modeset->crtc; modeset++)
/**
* drm_client_for_each_connector_iter - connector_list iterator macro
* @ connector : & struct drm_connector pointer used as cursor
* @ iter : & struct drm_connector_list_iter
*
* This iterates the connectors that are useable for internal clients ( excludes
* writeback connectors ) .
*
* For more info see drm_for_each_connector_iter ( ) .
*/
#define drm_client_for_each_connector_iter(connector, iter) \
drm_for_each_connector_iter(connector, iter) \
if (connector->connector_type != DRM_MODE_CONNECTOR_WRITEBACK)
#endif
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(vorverarbeitet am 2026-09-29)
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