/*
* 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 <video/nomodeset.h>
#include <drm/drm_device.h>
struct dmem_cgroup_region;
struct drm_fb_helper;
struct drm_fb_helper_surface_size;
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 ),
/**
* @ DRIVER_COMPUTE_ACCEL :
*
* Driver supports compute acceleration devices . This flag is mutually exclusive with
* @ DRIVER_RENDER and @ DRIVER_MODESET . Devices that support both graphics and compute
* acceleration should be handled by two drivers that are connected using auxiliary bus .
*/
DRIVER_COMPUTE_ACCEL = BIT(7 ),
/**
* @ DRIVER_GEM_GPUVA :
*
* Driver supports user defined GPU VA bindings for GEM objects .
*/
DRIVER_GEM_GPUVA = BIT(8 ),
/**
* @ DRIVER_CURSOR_HOTSPOT :
*
* Driver supports and requires cursor hotspot information in the
* cursor plane ( e . g . cursor plane has to actually track the mouse
* cursor and the clients are required to set hotspot in order for
* the cursor planes to work correctly ) .
*/
DRIVER_CURSOR_HOTSPOT = BIT(9 ),
/* 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 ),
};
/**
* 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 *);
/**
* @ 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 . Returns a GEM object on success , or an
* ERR_PTR ( ) - encoded error code otherwise .
*/
struct drm_gem_object *(*gem_create_object)(struct drm_device *dev,
size_t size);
/**
* @ prime_handle_to_fd :
*
* PRIME export function . Only used by vmwgfx .
*/
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 :
*
* PRIME import function . Only used by vmwgfx .
*/
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);
/**
* @ 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);
/**
* @ fbdev_probe :
*
* Allocates and initialize the fb_info structure for fbdev emulation .
* Furthermore it also needs to allocate the DRM framebuffer used to
* back the fbdev .
*
* This callback is mandatory for fbdev support .
*
* Returns :
*
* 0 on success ot a negative error code otherwise .
*/
int (*fbdev_probe)(struct drm_fb_helper *fbdev_helper,
struct drm_fb_helper_surface_size *sizes);
/**
* @ show_fdinfo :
*
* Print device specific fdinfo . See Documentation / gpu / drm - usage - stats . rst .
*/
void (*show_fdinfo)(struct drm_printer *p, struct drm_file *f);
/** @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;
/**
* @ 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;
};
void *__devm_drm_dev_alloc(struct device *parent,
const struct drm_driver *driver,
size_t size, size_t offset);
struct dmem_cgroup_region *
drmm_cgroup_register_region(struct drm_device *dev,
const char *region_name, u64 size);
/**
* 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);
void *__drm_dev_alloc(struct device *parent,
const struct drm_driver *driver,
size_t size, size_t offset);
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);
int drm_dev_wedged_event(struct drm_device *dev, unsigned long method,
struct drm_wedge_task_info *info);
/**
* 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);
}
/* TODO: Inline drm_firmware_drivers_only() in all its callers. */
static inline bool drm_firmware_drivers_only(void )
{
return video_firmware_drivers_only();
}
#if defined (CONFIG_DEBUG_FS)
void drm_debugfs_dev_init(struct drm_device *dev);
void drm_debugfs_init_root(void );
void drm_debugfs_remove_root(void );
void drm_debugfs_bridge_params(void );
#else
static inline void drm_debugfs_dev_init(struct drm_device *dev)
{
}
static inline void drm_debugfs_init_root(void )
{
}
static inline void drm_debugfs_remove_root(void )
{
}
static inline void drm_debugfs_bridge_params(void )
{
}
#endif
#endif
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