2 * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
3 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
4 * Copyright (c) 2009-2010, Code Aurora Forum.
5 * Copyright 2016 Intel Corp.
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30 #include <linux/list.h>
31 #include <linux/irqreturn.h>
33 #include <video/nomodeset.h>
35 #include <drm/drm_device.h>
38 struct drm_gem_object;
42 struct dma_buf_attachment;
43 struct drm_display_mode;
44 struct drm_mode_create_dumb;
49 * enum drm_driver_feature - feature flags
51 * See &drm_driver.driver_features, drm_device.driver_features and
52 * drm_core_check_feature().
54 enum drm_driver_feature {
58 * Driver use the GEM memory manager. This should be set for all modern
65 * Driver supports mode setting interfaces (KMS).
67 DRIVER_MODESET = BIT(1),
71 * Driver supports dedicated render nodes. See also the :ref:`section on
72 * render nodes <drm_render_node>` for details.
74 DRIVER_RENDER = BIT(3),
78 * Driver supports the full atomic modesetting userspace API. Drivers
79 * which only use atomic internally, but do not support the full
80 * userspace API (e.g. not all properties converted to atomic, or
81 * multi-plane updates are not guaranteed to be tear-free) should not
84 DRIVER_ATOMIC = BIT(4),
88 * Driver supports &drm_syncobj for explicit synchronization of command
91 DRIVER_SYNCOBJ = BIT(5),
93 * @DRIVER_SYNCOBJ_TIMELINE:
95 * Driver supports the timeline flavor of &drm_syncobj for explicit
96 * synchronization of command submission.
98 DRIVER_SYNCOBJ_TIMELINE = BIT(6),
100 * @DRIVER_COMPUTE_ACCEL:
102 * Driver supports compute acceleration devices. This flag is mutually exclusive with
103 * @DRIVER_RENDER and @DRIVER_MODESET. Devices that support both graphics and compute
104 * acceleration should be handled by two drivers that are connected using auxiliary bus.
106 DRIVER_COMPUTE_ACCEL = BIT(7),
108 /* IMPORTANT: Below are all the legacy flags, add new ones above. */
113 * Set up DRM AGP support, see drm_agp_init(), the DRM core will manage
114 * AGP resources. New drivers don't need this.
116 DRIVER_USE_AGP = BIT(25),
120 * Denote a legacy driver using shadow attach. Do not use.
122 DRIVER_LEGACY = BIT(26),
126 * Driver is capable of PCI DMA, mapping of PCI DMA buffers to userspace
127 * will be enabled. Only for legacy drivers. Do not use.
129 DRIVER_PCI_DMA = BIT(27),
133 * Driver can perform scatter/gather DMA, allocation and mapping of
134 * scatter/gather buffers will be enabled. Only for legacy drivers. Do
142 * Driver supports DMA, the userspace DMA API will be supported. Only
143 * for legacy drivers. Do not use.
145 DRIVER_HAVE_DMA = BIT(29),
149 * Legacy irq support. Only for legacy drivers. Do not use.
151 DRIVER_HAVE_IRQ = BIT(30),
153 * @DRIVER_KMS_LEGACY_CONTEXT:
155 * Used only by nouveau for backwards compatibility with existing
156 * userspace. Do not use.
158 DRIVER_KMS_LEGACY_CONTEXT = BIT(31),
162 * struct drm_driver - DRM driver structure
164 * This structure represent the common code for a family of cards. There will be
165 * one &struct drm_device for each card present in this family. It contains lots
166 * of vfunc entries, and a pile of those probably should be moved to more
167 * appropriate places like &drm_mode_config_funcs or into a new operations
168 * structure for GEM drivers.
174 * Backward-compatible driver callback to complete initialization steps
175 * after the driver is registered. For this reason, may suffer from
176 * race conditions and its use is deprecated for new drivers. It is
177 * therefore only supported for existing drivers not yet converted to
178 * the new scheme. See devm_drm_dev_alloc() and drm_dev_register() for
179 * proper and race-free way to set up a &struct drm_device.
181 * This is deprecated, do not use!
185 * Zero on success, non-zero value on failure.
187 int (*load) (struct drm_device *, unsigned long flags);
192 * Driver callback when a new &struct drm_file is opened. Useful for
193 * setting up driver-private data structures like buffer allocators,
194 * execution contexts or similar things. Such driver-private resources
195 * must be released again in @postclose.
197 * Since the display/modeset side of DRM can only be owned by exactly
198 * one &struct drm_file (see &drm_file.is_master and &drm_device.master)
199 * there should never be a need to set up any modeset related resources
200 * in this callback. Doing so would be a driver design bug.
204 * 0 on success, a negative error code on failure, which will be
205 * promoted to userspace as the result of the open() system call.
207 int (*open) (struct drm_device *, struct drm_file *);
212 * One of the driver callbacks when a new &struct drm_file is closed.
213 * Useful for tearing down driver-private data structures allocated in
214 * @open like buffer allocators, execution contexts or similar things.
216 * Since the display/modeset side of DRM can only be owned by exactly
217 * one &struct drm_file (see &drm_file.is_master and &drm_device.master)
218 * there should never be a need to tear down any modeset related
219 * resources in this callback. Doing so would be a driver design bug.
221 void (*postclose) (struct drm_device *, struct drm_file *);
226 * Called when the last &struct drm_file has been closed and there's
227 * currently no userspace client for the &struct drm_device.
229 * Modern drivers should only use this to force-restore the fbdev
230 * framebuffer using drm_fb_helper_restore_fbdev_mode_unlocked().
231 * Anything else would indicate there's something seriously wrong.
232 * Modern drivers can also use this to execute delayed power switching
233 * state changes, e.g. in conjunction with the :ref:`vga_switcheroo`
236 * This is called after @postclose hook has been called.
240 * All legacy drivers use this callback to de-initialize the hardware.
241 * This is purely because of the shadow-attach model, where the DRM
242 * kernel driver does not really own the hardware. Instead ownershipe is
243 * handled with the help of userspace through an inheritedly racy dance
244 * to set/unset the VT into raw mode.
246 * Legacy drivers initialize the hardware in the @firstopen callback,
247 * which isn't even called for modern drivers.
249 void (*lastclose) (struct drm_device *);
254 * Reverse the effects of the driver load callback. Ideally,
255 * the clean up performed by the driver should happen in the
256 * reverse order of the initialization. Similarly to the load
257 * hook, this handler is deprecated and its usage should be
258 * dropped in favor of an open-coded teardown function at the
259 * driver layer. See drm_dev_unregister() and drm_dev_put()
260 * for the proper way to remove a &struct drm_device.
262 * The unload() hook is called right after unregistering
266 void (*unload) (struct drm_device *);
271 * Optional callback for destroying device data after the final
272 * reference is released, i.e. the device is being destroyed.
274 * This is deprecated, clean up all memory allocations associated with a
275 * &drm_device using drmm_add_action(), drmm_kmalloc() and related
276 * managed resources functions.
278 void (*release) (struct drm_device *);
283 * Called whenever the minor master is set. Only used by vmwgfx.
285 void (*master_set)(struct drm_device *dev, struct drm_file *file_priv,
290 * Called whenever the minor master is dropped. Only used by vmwgfx.
292 void (*master_drop)(struct drm_device *dev, struct drm_file *file_priv);
297 * Allows drivers to create driver-specific debugfs files.
299 void (*debugfs_init)(struct drm_minor *minor);
302 * @gem_create_object: constructor for gem objects
304 * Hook for allocating the GEM object struct, for use by the CMA
305 * and SHMEM GEM helpers. Returns a GEM object on success, or an
306 * ERR_PTR()-encoded error code otherwise.
308 struct drm_gem_object *(*gem_create_object)(struct drm_device *dev,
312 * @prime_handle_to_fd:
314 * Main PRIME export function. Should be implemented with
315 * drm_gem_prime_handle_to_fd() for GEM based drivers.
317 * For an in-depth discussion see :ref:`PRIME buffer sharing
318 * documentation <prime_buffer_sharing>`.
320 int (*prime_handle_to_fd)(struct drm_device *dev, struct drm_file *file_priv,
321 uint32_t handle, uint32_t flags, int *prime_fd);
323 * @prime_fd_to_handle:
325 * Main PRIME import function. Should be implemented with
326 * drm_gem_prime_fd_to_handle() for GEM based drivers.
328 * For an in-depth discussion see :ref:`PRIME buffer sharing
329 * documentation <prime_buffer_sharing>`.
331 int (*prime_fd_to_handle)(struct drm_device *dev, struct drm_file *file_priv,
332 int prime_fd, uint32_t *handle);
337 * Import hook for GEM drivers.
339 * This defaults to drm_gem_prime_import() if not set.
341 struct drm_gem_object * (*gem_prime_import)(struct drm_device *dev,
342 struct dma_buf *dma_buf);
344 * @gem_prime_import_sg_table:
346 * Optional hook used by the PRIME helper functions
347 * drm_gem_prime_import() respectively drm_gem_prime_import_dev().
349 struct drm_gem_object *(*gem_prime_import_sg_table)(
350 struct drm_device *dev,
351 struct dma_buf_attachment *attach,
352 struct sg_table *sgt);
356 * mmap hook for GEM drivers, used to implement dma-buf mmap in the
359 * This hook only exists for historical reasons. Drivers must use
360 * drm_gem_prime_mmap() to implement it.
362 * FIXME: Convert all drivers to implement mmap in struct
363 * &drm_gem_object_funcs and inline drm_gem_prime_mmap() into
364 * its callers. This hook should be removed afterwards.
366 int (*gem_prime_mmap)(struct drm_gem_object *obj, struct vm_area_struct *vma);
371 * This creates a new dumb buffer in the driver's backing storage manager (GEM,
372 * TTM or something else entirely) and returns the resulting buffer handle. This
373 * handle can then be wrapped up into a framebuffer modeset object.
375 * Note that userspace is not allowed to use such objects for render
376 * acceleration - drivers must create their own private ioctls for such a use
379 * Width, height and depth are specified in the &drm_mode_create_dumb
380 * argument. The callback needs to fill the handle, pitch and size for
381 * the created buffer.
383 * Called by the user via ioctl.
387 * Zero on success, negative errno on failure.
389 int (*dumb_create)(struct drm_file *file_priv,
390 struct drm_device *dev,
391 struct drm_mode_create_dumb *args);
395 * Allocate an offset in the drm device node's address space to be able to
396 * memory map a dumb buffer.
398 * The default implementation is drm_gem_create_mmap_offset(). GEM based
399 * drivers must not overwrite this.
401 * Called by the user via ioctl.
405 * Zero on success, negative errno on failure.
407 int (*dumb_map_offset)(struct drm_file *file_priv,
408 struct drm_device *dev, uint32_t handle,
413 * This destroys the userspace handle for the given dumb backing storage buffer.
414 * Since buffer objects must be reference counted in the kernel a buffer object
415 * won't be immediately freed if a framebuffer modeset object still uses it.
417 * Called by the user via ioctl.
419 * The default implementation is drm_gem_dumb_destroy(). GEM based drivers
420 * must not overwrite this.
424 * Zero on success, negative errno on failure.
426 int (*dumb_destroy)(struct drm_file *file_priv,
427 struct drm_device *dev,
430 /** @major: driver major number */
432 /** @minor: driver minor number */
434 /** @patchlevel: driver patch level */
436 /** @name: driver name */
438 /** @desc: driver description */
440 /** @date: driver date */
445 * Driver features, see &enum drm_driver_feature. Drivers can disable
446 * some features on a per-instance basis using
447 * &drm_device.driver_features.
454 * Array of driver-private IOCTL description entries. See the chapter on
455 * :ref:`IOCTL support in the userland interfaces
456 * chapter<drm_driver_ioctl>` for the full details.
459 const struct drm_ioctl_desc *ioctls;
460 /** @num_ioctls: Number of entries in @ioctls. */
466 * File operations for the DRM device node. See the discussion in
467 * :ref:`file operations<drm_driver_fops>` for in-depth coverage and
470 const struct file_operations *fops;
472 #ifdef CONFIG_DRM_LEGACY
473 /* Everything below here is for legacy driver, never use! */
476 int (*firstopen) (struct drm_device *);
477 void (*preclose) (struct drm_device *, struct drm_file *file_priv);
478 int (*dma_ioctl) (struct drm_device *dev, void *data, struct drm_file *file_priv);
479 int (*dma_quiescent) (struct drm_device *);
480 int (*context_dtor) (struct drm_device *dev, int context);
481 irqreturn_t (*irq_handler)(int irq, void *arg);
482 void (*irq_preinstall)(struct drm_device *dev);
483 int (*irq_postinstall)(struct drm_device *dev);
484 void (*irq_uninstall)(struct drm_device *dev);
485 u32 (*get_vblank_counter)(struct drm_device *dev, unsigned int pipe);
486 int (*enable_vblank)(struct drm_device *dev, unsigned int pipe);
487 void (*disable_vblank)(struct drm_device *dev, unsigned int pipe);
492 void *__devm_drm_dev_alloc(struct device *parent,
493 const struct drm_driver *driver,
494 size_t size, size_t offset);
497 * devm_drm_dev_alloc - Resource managed allocation of a &drm_device instance
498 * @parent: Parent device object
499 * @driver: DRM driver
500 * @type: the type of the struct which contains struct &drm_device
501 * @member: the name of the &drm_device within @type.
503 * This allocates and initialize a new DRM device. No device registration is done.
504 * Call drm_dev_register() to advertice the device to user space and register it
505 * with other core subsystems. This should be done last in the device
506 * initialization sequence to make sure userspace can't access an inconsistent
509 * The initial ref-count of the object is 1. Use drm_dev_get() and
510 * drm_dev_put() to take and drop further ref-counts.
512 * It is recommended that drivers embed &struct drm_device into their own device
515 * Note that this manages the lifetime of the resulting &drm_device
516 * automatically using devres. The DRM device initialized with this function is
517 * automatically put on driver detach using drm_dev_put().
520 * Pointer to new DRM device, or ERR_PTR on failure.
522 #define devm_drm_dev_alloc(parent, driver, type, member) \
523 ((type *) __devm_drm_dev_alloc(parent, driver, sizeof(type), \
524 offsetof(type, member)))
526 struct drm_device *drm_dev_alloc(const struct drm_driver *driver,
527 struct device *parent);
528 int drm_dev_register(struct drm_device *dev, unsigned long flags);
529 void drm_dev_unregister(struct drm_device *dev);
531 void drm_dev_get(struct drm_device *dev);
532 void drm_dev_put(struct drm_device *dev);
533 void drm_put_dev(struct drm_device *dev);
534 bool drm_dev_enter(struct drm_device *dev, int *idx);
535 void drm_dev_exit(int idx);
536 void drm_dev_unplug(struct drm_device *dev);
539 * drm_dev_is_unplugged - is a DRM device unplugged
542 * This function can be called to check whether a hotpluggable is unplugged.
543 * Unplugging itself is singalled through drm_dev_unplug(). If a device is
544 * unplugged, these two functions guarantee that any store before calling
545 * drm_dev_unplug() is visible to callers of this function after it completes
547 * WARNING: This function fundamentally races against drm_dev_unplug(). It is
548 * recommended that drivers instead use the underlying drm_dev_enter() and
549 * drm_dev_exit() function pairs.
551 static inline bool drm_dev_is_unplugged(struct drm_device *dev)
555 if (drm_dev_enter(dev, &idx)) {
564 * drm_core_check_all_features - check driver feature flags mask
565 * @dev: DRM device to check
566 * @features: feature flag(s) mask
568 * This checks @dev for driver features, see &drm_driver.driver_features,
569 * &drm_device.driver_features, and the various &enum drm_driver_feature flags.
571 * Returns true if all features in the @features mask are supported, false
574 static inline bool drm_core_check_all_features(const struct drm_device *dev,
577 u32 supported = dev->driver->driver_features & dev->driver_features;
579 return features && (supported & features) == features;
583 * drm_core_check_feature - check driver feature flags
584 * @dev: DRM device to check
585 * @feature: feature flag
587 * This checks @dev for driver features, see &drm_driver.driver_features,
588 * &drm_device.driver_features, and the various &enum drm_driver_feature flags.
590 * Returns true if the @feature is supported, false otherwise.
592 static inline bool drm_core_check_feature(const struct drm_device *dev,
593 enum drm_driver_feature feature)
595 return drm_core_check_all_features(dev, feature);
599 * drm_drv_uses_atomic_modeset - check if the driver implements
603 * This check is useful if drivers do not have DRIVER_ATOMIC set but
604 * have atomic modesetting internally implemented.
606 static inline bool drm_drv_uses_atomic_modeset(struct drm_device *dev)
608 return drm_core_check_feature(dev, DRIVER_ATOMIC) ||
609 (dev->mode_config.funcs && dev->mode_config.funcs->atomic_commit != NULL);
613 int drm_dev_set_unique(struct drm_device *dev, const char *name);
615 /* TODO: Inline drm_firmware_drivers_only() in all its callers. */
616 static inline bool drm_firmware_drivers_only(void)
618 return video_firmware_drivers_only();