Current File : //proc/self/root/usr/src/linux-headers-5.15.0-125/include/drm/drm_drv.h
/*
* Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
* Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
* Copyright (c) 2009-2010, Code Aurora Forum.
* Copyright 2016 Intel Corp.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*/
#ifndef _DRM_DRV_H_
#define _DRM_DRV_H_
#include <linux/list.h>
#include <linux/irqreturn.h>
#include <drm/drm_device.h>
struct drm_file;
struct drm_gem_object;
struct drm_master;
struct drm_minor;
struct dma_buf;
struct dma_buf_attachment;
struct drm_display_mode;
struct drm_mode_create_dumb;
struct drm_printer;
struct sg_table;
/**
* enum drm_driver_feature - feature flags
*
* See &drm_driver.driver_features, drm_device.driver_features and
* drm_core_check_feature().
*/
enum drm_driver_feature {
/**
* @DRIVER_GEM:
*
* Driver use the GEM memory manager. This should be set for all modern
* drivers.
*/
DRIVER_GEM = BIT(0),
/**
* @DRIVER_MODESET:
*
* Driver supports mode setting interfaces (KMS).
*/
DRIVER_MODESET = BIT(1),
/**
* @DRIVER_RENDER:
*
* Driver supports dedicated render nodes. See also the :ref:`section on
* render nodes <drm_render_node>` for details.
*/
DRIVER_RENDER = BIT(3),
/**
* @DRIVER_ATOMIC:
*
* Driver supports the full atomic modesetting userspace API. Drivers
* which only use atomic internally, but do not support the full
* userspace API (e.g. not all properties converted to atomic, or
* multi-plane updates are not guaranteed to be tear-free) should not
* set this flag.
*/
DRIVER_ATOMIC = BIT(4),
/**
* @DRIVER_SYNCOBJ:
*
* Driver supports &drm_syncobj for explicit synchronization of command
* submission.
*/
DRIVER_SYNCOBJ = BIT(5),
/**
* @DRIVER_SYNCOBJ_TIMELINE:
*
* Driver supports the timeline flavor of &drm_syncobj for explicit
* synchronization of command submission.
*/
DRIVER_SYNCOBJ_TIMELINE = BIT(6),
/* IMPORTANT: Below are all the legacy flags, add new ones above. */
/**
* @DRIVER_USE_AGP:
*
* Set up DRM AGP support, see drm_agp_init(), the DRM core will manage
* AGP resources. New drivers don't need this.
*/
DRIVER_USE_AGP = BIT(25),
/**
* @DRIVER_LEGACY:
*
* Denote a legacy driver using shadow attach. Do not use.
*/
DRIVER_LEGACY = BIT(26),
/**
* @DRIVER_PCI_DMA:
*
* Driver is capable of PCI DMA, mapping of PCI DMA buffers to userspace
* will be enabled. Only for legacy drivers. Do not use.
*/
DRIVER_PCI_DMA = BIT(27),
/**
* @DRIVER_SG:
*
* Driver can perform scatter/gather DMA, allocation and mapping of
* scatter/gather buffers will be enabled. Only for legacy drivers. Do
* not use.
*/
DRIVER_SG = BIT(28),
/**
* @DRIVER_HAVE_DMA:
*
* Driver supports DMA, the userspace DMA API will be supported. Only
* for legacy drivers. Do not use.
*/
DRIVER_HAVE_DMA = BIT(29),
/**
* @DRIVER_HAVE_IRQ:
*
* Legacy irq support. Only for legacy drivers. Do not use.
*/
DRIVER_HAVE_IRQ = BIT(30),
/**
* @DRIVER_KMS_LEGACY_CONTEXT:
*
* Used only by nouveau for backwards compatibility with existing
* userspace. Do not use.
*/
DRIVER_KMS_LEGACY_CONTEXT = BIT(31),
};
/**
* struct drm_driver - DRM driver structure
*
* This structure represent the common code for a family of cards. There will be
* one &struct drm_device for each card present in this family. It contains lots
* of vfunc entries, and a pile of those probably should be moved to more
* appropriate places like &drm_mode_config_funcs or into a new operations
* structure for GEM drivers.
*/
struct drm_driver {
/**
* @load:
*
* Backward-compatible driver callback to complete initialization steps
* after the driver is registered. For this reason, may suffer from
* race conditions and its use is deprecated for new drivers. It is
* therefore only supported for existing drivers not yet converted to
* the new scheme. See devm_drm_dev_alloc() and drm_dev_register() for
* proper and race-free way to set up a &struct drm_device.
*
* This is deprecated, do not use!
*
* Returns:
*
* Zero on success, non-zero value on failure.
*/
int (*load) (struct drm_device *, unsigned long flags);
/**
* @open:
*
* Driver callback when a new &struct drm_file is opened. Useful for
* setting up driver-private data structures like buffer allocators,
* execution contexts or similar things. Such driver-private resources
* must be released again in @postclose.
*
* Since the display/modeset side of DRM can only be owned by exactly
* one &struct drm_file (see &drm_file.is_master and &drm_device.master)
* there should never be a need to set up any modeset related resources
* in this callback. Doing so would be a driver design bug.
*
* Returns:
*
* 0 on success, a negative error code on failure, which will be
* promoted to userspace as the result of the open() system call.
*/
int (*open) (struct drm_device *, struct drm_file *);
/**
* @postclose:
*
* One of the driver callbacks when a new &struct drm_file is closed.
* Useful for tearing down driver-private data structures allocated in
* @open like buffer allocators, execution contexts or similar things.
*
* Since the display/modeset side of DRM can only be owned by exactly
* one &struct drm_file (see &drm_file.is_master and &drm_device.master)
* there should never be a need to tear down any modeset related
* resources in this callback. Doing so would be a driver design bug.
*/
void (*postclose) (struct drm_device *, struct drm_file *);
/**
* @lastclose:
*
* Called when the last &struct drm_file has been closed and there's
* currently no userspace client for the &struct drm_device.
*
* Modern drivers should only use this to force-restore the fbdev
* framebuffer using drm_fb_helper_restore_fbdev_mode_unlocked().
* Anything else would indicate there's something seriously wrong.
* Modern drivers can also use this to execute delayed power switching
* state changes, e.g. in conjunction with the :ref:`vga_switcheroo`
* infrastructure.
*
* This is called after @postclose hook has been called.
*
* NOTE:
*
* All legacy drivers use this callback to de-initialize the hardware.
* This is purely because of the shadow-attach model, where the DRM
* kernel driver does not really own the hardware. Instead ownershipe is
* handled with the help of userspace through an inheritedly racy dance
* to set/unset the VT into raw mode.
*
* Legacy drivers initialize the hardware in the @firstopen callback,
* which isn't even called for modern drivers.
*/
void (*lastclose) (struct drm_device *);
/**
* @unload:
*
* Reverse the effects of the driver load callback. Ideally,
* the clean up performed by the driver should happen in the
* reverse order of the initialization. Similarly to the load
* hook, this handler is deprecated and its usage should be
* dropped in favor of an open-coded teardown function at the
* driver layer. See drm_dev_unregister() and drm_dev_put()
* for the proper way to remove a &struct drm_device.
*
* The unload() hook is called right after unregistering
* the device.
*
*/
void (*unload) (struct drm_device *);
/**
* @release:
*
* Optional callback for destroying device data after the final
* reference is released, i.e. the device is being destroyed.
*
* This is deprecated, clean up all memory allocations associated with a
* &drm_device using drmm_add_action(), drmm_kmalloc() and related
* managed resources functions.
*/
void (*release) (struct drm_device *);
/**
* @master_set:
*
* Called whenever the minor master is set. Only used by vmwgfx.
*/
void (*master_set)(struct drm_device *dev, struct drm_file *file_priv,
bool from_open);
/**
* @master_drop:
*
* Called whenever the minor master is dropped. Only used by vmwgfx.
*/
void (*master_drop)(struct drm_device *dev, struct drm_file *file_priv);
/**
* @debugfs_init:
*
* Allows drivers to create driver-specific debugfs files.
*/
void (*debugfs_init)(struct drm_minor *minor);
/**
* @gem_create_object: constructor for gem objects
*
* Hook for allocating the GEM object struct, for use by the CMA and
* SHMEM GEM helpers.
*/
struct drm_gem_object *(*gem_create_object)(struct drm_device *dev,
size_t size);
/**
* @prime_handle_to_fd:
*
* Main PRIME export function. Should be implemented with
* drm_gem_prime_handle_to_fd() for GEM based drivers.
*
* For an in-depth discussion see :ref:`PRIME buffer sharing
* documentation <prime_buffer_sharing>`.
*/
int (*prime_handle_to_fd)(struct drm_device *dev, struct drm_file *file_priv,
uint32_t handle, uint32_t flags, int *prime_fd);
/**
* @prime_fd_to_handle:
*
* Main PRIME import function. Should be implemented with
* drm_gem_prime_fd_to_handle() for GEM based drivers.
*
* For an in-depth discussion see :ref:`PRIME buffer sharing
* documentation <prime_buffer_sharing>`.
*/
int (*prime_fd_to_handle)(struct drm_device *dev, struct drm_file *file_priv,
int prime_fd, uint32_t *handle);
/**
* @gem_prime_import:
*
* Import hook for GEM drivers.
*
* This defaults to drm_gem_prime_import() if not set.
*/
struct drm_gem_object * (*gem_prime_import)(struct drm_device *dev,
struct dma_buf *dma_buf);
/**
* @gem_prime_import_sg_table:
*
* Optional hook used by the PRIME helper functions
* drm_gem_prime_import() respectively drm_gem_prime_import_dev().
*/
struct drm_gem_object *(*gem_prime_import_sg_table)(
struct drm_device *dev,
struct dma_buf_attachment *attach,
struct sg_table *sgt);
/**
* @gem_prime_mmap:
*
* mmap hook for GEM drivers, used to implement dma-buf mmap in the
* PRIME helpers.
*
* FIXME: There's way too much duplication going on here, and also moved
* to &drm_gem_object_funcs.
*/
int (*gem_prime_mmap)(struct drm_gem_object *obj,
struct vm_area_struct *vma);
/**
* @dumb_create:
*
* This creates a new dumb buffer in the driver's backing storage manager (GEM,
* TTM or something else entirely) and returns the resulting buffer handle. This
* handle can then be wrapped up into a framebuffer modeset object.
*
* Note that userspace is not allowed to use such objects for render
* acceleration - drivers must create their own private ioctls for such a use
* case.
*
* Width, height and depth are specified in the &drm_mode_create_dumb
* argument. The callback needs to fill the handle, pitch and size for
* the created buffer.
*
* Called by the user via ioctl.
*
* Returns:
*
* Zero on success, negative errno on failure.
*/
int (*dumb_create)(struct drm_file *file_priv,
struct drm_device *dev,
struct drm_mode_create_dumb *args);
/**
* @dumb_map_offset:
*
* Allocate an offset in the drm device node's address space to be able to
* memory map a dumb buffer.
*
* The default implementation is drm_gem_create_mmap_offset(). GEM based
* drivers must not overwrite this.
*
* Called by the user via ioctl.
*
* Returns:
*
* Zero on success, negative errno on failure.
*/
int (*dumb_map_offset)(struct drm_file *file_priv,
struct drm_device *dev, uint32_t handle,
uint64_t *offset);
/**
* @dumb_destroy:
*
* This destroys the userspace handle for the given dumb backing storage buffer.
* Since buffer objects must be reference counted in the kernel a buffer object
* won't be immediately freed if a framebuffer modeset object still uses it.
*
* Called by the user via ioctl.
*
* The default implementation is drm_gem_dumb_destroy(). GEM based drivers
* must not overwrite this.
*
* Returns:
*
* Zero on success, negative errno on failure.
*/
int (*dumb_destroy)(struct drm_file *file_priv,
struct drm_device *dev,
uint32_t handle);
/** @major: driver major number */
int major;
/** @minor: driver minor number */
int minor;
/** @patchlevel: driver patch level */
int patchlevel;
/** @name: driver name */
char *name;
/** @desc: driver description */
char *desc;
/** @date: driver date */
char *date;
/**
* @driver_features:
* Driver features, see &enum drm_driver_feature. Drivers can disable
* some features on a per-instance basis using
* &drm_device.driver_features.
*/
u32 driver_features;
/**
* @ioctls:
*
* Array of driver-private IOCTL description entries. See the chapter on
* :ref:`IOCTL support in the userland interfaces
* chapter<drm_driver_ioctl>` for the full details.
*/
const struct drm_ioctl_desc *ioctls;
/** @num_ioctls: Number of entries in @ioctls. */
int num_ioctls;
/**
* @fops:
*
* File operations for the DRM device node. See the discussion in
* :ref:`file operations<drm_driver_fops>` for in-depth coverage and
* some examples.
*/
const struct file_operations *fops;
#ifdef CONFIG_DRM_LEGACY
/* Everything below here is for legacy driver, never use! */
/* private: */
int (*firstopen) (struct drm_device *);
void (*preclose) (struct drm_device *, struct drm_file *file_priv);
int (*dma_ioctl) (struct drm_device *dev, void *data, struct drm_file *file_priv);
int (*dma_quiescent) (struct drm_device *);
int (*context_dtor) (struct drm_device *dev, int context);
irqreturn_t (*irq_handler)(int irq, void *arg);
void (*irq_preinstall)(struct drm_device *dev);
int (*irq_postinstall)(struct drm_device *dev);
void (*irq_uninstall)(struct drm_device *dev);
u32 (*get_vblank_counter)(struct drm_device *dev, unsigned int pipe);
int (*enable_vblank)(struct drm_device *dev, unsigned int pipe);
void (*disable_vblank)(struct drm_device *dev, unsigned int pipe);
int dev_priv_size;
#endif
};
void *__devm_drm_dev_alloc(struct device *parent,
const struct drm_driver *driver,
size_t size, size_t offset);
/**
* devm_drm_dev_alloc - Resource managed allocation of a &drm_device instance
* @parent: Parent device object
* @driver: DRM driver
* @type: the type of the struct which contains struct &drm_device
* @member: the name of the &drm_device within @type.
*
* This allocates and initialize a new DRM device. No device registration is done.
* Call drm_dev_register() to advertice the device to user space and register it
* with other core subsystems. This should be done last in the device
* initialization sequence to make sure userspace can't access an inconsistent
* state.
*
* The initial ref-count of the object is 1. Use drm_dev_get() and
* drm_dev_put() to take and drop further ref-counts.
*
* It is recommended that drivers embed &struct drm_device into their own device
* structure.
*
* Note that this manages the lifetime of the resulting &drm_device
* automatically using devres. The DRM device initialized with this function is
* automatically put on driver detach using drm_dev_put().
*
* RETURNS:
* Pointer to new DRM device, or ERR_PTR on failure.
*/
#define devm_drm_dev_alloc(parent, driver, type, member) \
((type *) __devm_drm_dev_alloc(parent, driver, sizeof(type), \
offsetof(type, member)))
struct drm_device *drm_dev_alloc(const struct drm_driver *driver,
struct device *parent);
int drm_dev_register(struct drm_device *dev, unsigned long flags);
void drm_dev_unregister(struct drm_device *dev);
void drm_dev_get(struct drm_device *dev);
void drm_dev_put(struct drm_device *dev);
void drm_put_dev(struct drm_device *dev);
bool drm_dev_enter(struct drm_device *dev, int *idx);
void drm_dev_exit(int idx);
void drm_dev_unplug(struct drm_device *dev);
/**
* drm_dev_is_unplugged - is a DRM device unplugged
* @dev: DRM device
*
* This function can be called to check whether a hotpluggable is unplugged.
* Unplugging itself is singalled through drm_dev_unplug(). If a device is
* unplugged, these two functions guarantee that any store before calling
* drm_dev_unplug() is visible to callers of this function after it completes
*
* WARNING: This function fundamentally races against drm_dev_unplug(). It is
* recommended that drivers instead use the underlying drm_dev_enter() and
* drm_dev_exit() function pairs.
*/
static inline bool drm_dev_is_unplugged(struct drm_device *dev)
{
int idx;
if (drm_dev_enter(dev, &idx)) {
drm_dev_exit(idx);
return false;
}
return true;
}
/**
* drm_core_check_all_features - check driver feature flags mask
* @dev: DRM device to check
* @features: feature flag(s) mask
*
* This checks @dev for driver features, see &drm_driver.driver_features,
* &drm_device.driver_features, and the various &enum drm_driver_feature flags.
*
* Returns true if all features in the @features mask are supported, false
* otherwise.
*/
static inline bool drm_core_check_all_features(const struct drm_device *dev,
u32 features)
{
u32 supported = dev->driver->driver_features & dev->driver_features;
return features && (supported & features) == features;
}
/**
* drm_core_check_feature - check driver feature flags
* @dev: DRM device to check
* @feature: feature flag
*
* This checks @dev for driver features, see &drm_driver.driver_features,
* &drm_device.driver_features, and the various &enum drm_driver_feature flags.
*
* Returns true if the @feature is supported, false otherwise.
*/
static inline bool drm_core_check_feature(const struct drm_device *dev,
enum drm_driver_feature feature)
{
return drm_core_check_all_features(dev, feature);
}
/**
* drm_drv_uses_atomic_modeset - check if the driver implements
* atomic_commit()
* @dev: DRM device
*
* This check is useful if drivers do not have DRIVER_ATOMIC set but
* have atomic modesetting internally implemented.
*/
static inline bool drm_drv_uses_atomic_modeset(struct drm_device *dev)
{
return drm_core_check_feature(dev, DRIVER_ATOMIC) ||
(dev->mode_config.funcs && dev->mode_config.funcs->atomic_commit != NULL);
}
int drm_dev_set_unique(struct drm_device *dev, const char *name);
#endif
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