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 <drm/drm_device.h>
36 struct drm_gem_object;
39 struct dma_buf_attachment;
40 struct drm_display_mode;
41 struct drm_mode_create_dumb;
45 * enum drm_driver_feature - feature flags
47 * See &drm_driver.driver_features, drm_device.driver_features and
48 * drm_core_check_feature().
50 enum drm_driver_feature {
54 * Driver use the GEM memory manager. This should be set for all modern
61 * Driver supports mode setting interfaces (KMS).
63 DRIVER_MODESET = BIT(1),
67 * Driver supports dedicated render nodes. See also the :ref:`section on
68 * render nodes <drm_render_node>` for details.
70 DRIVER_RENDER = BIT(3),
74 * Driver supports the full atomic modesetting userspace API. Drivers
75 * which only use atomic internally, but do not the support the full
76 * userspace API (e.g. not all properties converted to atomic, or
77 * multi-plane updates are not guaranteed to be tear-free) should not
80 DRIVER_ATOMIC = BIT(4),
84 * Driver supports &drm_syncobj for explicit synchronization of command
87 DRIVER_SYNCOBJ = BIT(5),
89 * @DRIVER_SYNCOBJ_TIMELINE:
91 * Driver supports the timeline flavor of &drm_syncobj for explicit
92 * synchronization of command submission.
94 DRIVER_SYNCOBJ_TIMELINE = BIT(6),
96 /* IMPORTANT: Below are all the legacy flags, add new ones above. */
101 * Set up DRM AGP support, see drm_agp_init(), the DRM core will manage
102 * AGP resources. New drivers don't need this.
104 DRIVER_USE_AGP = BIT(25),
108 * Denote a legacy driver using shadow attach. Do not use.
110 DRIVER_LEGACY = BIT(26),
114 * Driver is capable of PCI DMA, mapping of PCI DMA buffers to userspace
115 * will be enabled. Only for legacy drivers. Do not use.
117 DRIVER_PCI_DMA = BIT(27),
121 * Driver can perform scatter/gather DMA, allocation and mapping of
122 * scatter/gather buffers will be enabled. Only for legacy drivers. Do
130 * Driver supports DMA, the userspace DMA API will be supported. Only
131 * for legacy drivers. Do not use.
133 DRIVER_HAVE_DMA = BIT(29),
137 * Legacy irq support. Only for legacy drivers. Do not use.
139 * New drivers can either use the drm_irq_install() and
140 * drm_irq_uninstall() helper functions, or roll their own irq support
141 * code by calling request_irq() directly.
143 DRIVER_HAVE_IRQ = BIT(30),
145 * @DRIVER_KMS_LEGACY_CONTEXT:
147 * Used only by nouveau for backwards compatibility with existing
148 * userspace. Do not use.
150 DRIVER_KMS_LEGACY_CONTEXT = BIT(31),
154 * struct drm_driver - DRM driver structure
156 * This structure represent the common code for a family of cards. There will be
157 * one &struct drm_device for each card present in this family. It contains lots
158 * of vfunc entries, and a pile of those probably should be moved to more
159 * appropriate places like &drm_mode_config_funcs or into a new operations
160 * structure for GEM drivers.
166 * Backward-compatible driver callback to complete initialization steps
167 * after the driver is registered. For this reason, may suffer from
168 * race conditions and its use is deprecated for new drivers. It is
169 * therefore only supported for existing drivers not yet converted to
170 * the new scheme. See devm_drm_dev_alloc() and drm_dev_register() for
171 * proper and race-free way to set up a &struct drm_device.
173 * This is deprecated, do not use!
177 * Zero on success, non-zero value on failure.
179 int (*load) (struct drm_device *, unsigned long flags);
184 * Driver callback when a new &struct drm_file is opened. Useful for
185 * setting up driver-private data structures like buffer allocators,
186 * execution contexts or similar things. Such driver-private resources
187 * must be released again in @postclose.
189 * Since the display/modeset side of DRM can only be owned by exactly
190 * one &struct drm_file (see &drm_file.is_master and &drm_device.master)
191 * there should never be a need to set up any modeset related resources
192 * in this callback. Doing so would be a driver design bug.
196 * 0 on success, a negative error code on failure, which will be
197 * promoted to userspace as the result of the open() system call.
199 int (*open) (struct drm_device *, struct drm_file *);
204 * One of the driver callbacks when a new &struct drm_file is closed.
205 * Useful for tearing down driver-private data structures allocated in
206 * @open like buffer allocators, execution contexts or similar things.
208 * Since the display/modeset side of DRM can only be owned by exactly
209 * one &struct drm_file (see &drm_file.is_master and &drm_device.master)
210 * there should never be a need to tear down any modeset related
211 * resources in this callback. Doing so would be a driver design bug.
213 void (*postclose) (struct drm_device *, struct drm_file *);
218 * Called when the last &struct drm_file has been closed and there's
219 * currently no userspace client for the &struct drm_device.
221 * Modern drivers should only use this to force-restore the fbdev
222 * framebuffer using drm_fb_helper_restore_fbdev_mode_unlocked().
223 * Anything else would indicate there's something seriously wrong.
224 * Modern drivers can also use this to execute delayed power switching
225 * state changes, e.g. in conjunction with the :ref:`vga_switcheroo`
228 * This is called after @postclose hook has been called.
232 * All legacy drivers use this callback to de-initialize the hardware.
233 * This is purely because of the shadow-attach model, where the DRM
234 * kernel driver does not really own the hardware. Instead ownershipe is
235 * handled with the help of userspace through an inheritedly racy dance
236 * to set/unset the VT into raw mode.
238 * Legacy drivers initialize the hardware in the @firstopen callback,
239 * which isn't even called for modern drivers.
241 void (*lastclose) (struct drm_device *);
246 * Reverse the effects of the driver load callback. Ideally,
247 * the clean up performed by the driver should happen in the
248 * reverse order of the initialization. Similarly to the load
249 * hook, this handler is deprecated and its usage should be
250 * dropped in favor of an open-coded teardown function at the
251 * driver layer. See drm_dev_unregister() and drm_dev_put()
252 * for the proper way to remove a &struct drm_device.
254 * The unload() hook is called right after unregistering
258 void (*unload) (struct drm_device *);
263 * Optional callback for destroying device data after the final
264 * reference is released, i.e. the device is being destroyed.
266 * This is deprecated, clean up all memory allocations associated with a
267 * &drm_device using drmm_add_action(), drmm_kmalloc() and related
268 * managed resources functions.
270 void (*release) (struct drm_device *);
275 * Interrupt handler called when using drm_irq_install(). Not used by
276 * drivers which implement their own interrupt handling.
278 irqreturn_t(*irq_handler) (int irq, void *arg);
283 * Optional callback used by drm_irq_install() which is called before
284 * the interrupt handler is registered. This should be used to clear out
285 * any pending interrupts (from e.g. firmware based drives) and reset
286 * the interrupt handling registers.
288 void (*irq_preinstall) (struct drm_device *dev);
293 * Optional callback used by drm_irq_install() which is called after
294 * the interrupt handler is registered. This should be used to enable
295 * interrupt generation in the hardware.
297 int (*irq_postinstall) (struct drm_device *dev);
302 * Optional callback used by drm_irq_uninstall() which is called before
303 * the interrupt handler is unregistered. This should be used to disable
304 * interrupt generation in the hardware.
306 void (*irq_uninstall) (struct drm_device *dev);
311 * Called whenever the minor master is set. Only used by vmwgfx.
313 void (*master_set)(struct drm_device *dev, struct drm_file *file_priv,
318 * Called whenever the minor master is dropped. Only used by vmwgfx.
320 void (*master_drop)(struct drm_device *dev, struct drm_file *file_priv);
325 * Allows drivers to create driver-specific debugfs files.
327 void (*debugfs_init)(struct drm_minor *minor);
330 * @gem_free_object_unlocked: deconstructor for drm_gem_objects
332 * This is deprecated and should not be used by new drivers. Use
333 * &drm_gem_object_funcs.free instead.
335 void (*gem_free_object_unlocked) (struct drm_gem_object *obj);
340 * This callback is deprecated in favour of &drm_gem_object_funcs.open.
342 * Driver hook called upon gem handle creation
344 int (*gem_open_object) (struct drm_gem_object *, struct drm_file *);
349 * This callback is deprecated in favour of &drm_gem_object_funcs.close.
351 * Driver hook called upon gem handle release
353 void (*gem_close_object) (struct drm_gem_object *, struct drm_file *);
356 * @gem_create_object: constructor for gem objects
358 * Hook for allocating the GEM object struct, for use by the CMA and
361 struct drm_gem_object *(*gem_create_object)(struct drm_device *dev,
364 * @prime_handle_to_fd:
366 * Main PRIME export function. Should be implemented with
367 * drm_gem_prime_handle_to_fd() for GEM based drivers.
369 * For an in-depth discussion see :ref:`PRIME buffer sharing
370 * documentation <prime_buffer_sharing>`.
372 int (*prime_handle_to_fd)(struct drm_device *dev, struct drm_file *file_priv,
373 uint32_t handle, uint32_t flags, int *prime_fd);
375 * @prime_fd_to_handle:
377 * Main PRIME import function. Should be implemented with
378 * drm_gem_prime_fd_to_handle() for GEM based drivers.
380 * For an in-depth discussion see :ref:`PRIME buffer sharing
381 * documentation <prime_buffer_sharing>`.
383 int (*prime_fd_to_handle)(struct drm_device *dev, struct drm_file *file_priv,
384 int prime_fd, uint32_t *handle);
388 * Export hook for GEM drivers. Deprecated in favour of
389 * &drm_gem_object_funcs.export.
391 struct dma_buf * (*gem_prime_export)(struct drm_gem_object *obj,
396 * Import hook for GEM drivers.
398 * This defaults to drm_gem_prime_import() if not set.
400 struct drm_gem_object * (*gem_prime_import)(struct drm_device *dev,
401 struct dma_buf *dma_buf);
406 * Deprecated hook in favour of &drm_gem_object_funcs.pin.
408 int (*gem_prime_pin)(struct drm_gem_object *obj);
413 * Deprecated hook in favour of &drm_gem_object_funcs.unpin.
415 void (*gem_prime_unpin)(struct drm_gem_object *obj);
419 * @gem_prime_get_sg_table:
421 * Deprecated hook in favour of &drm_gem_object_funcs.get_sg_table.
423 struct sg_table *(*gem_prime_get_sg_table)(struct drm_gem_object *obj);
426 * @gem_prime_import_sg_table:
428 * Optional hook used by the PRIME helper functions
429 * drm_gem_prime_import() respectively drm_gem_prime_import_dev().
431 struct drm_gem_object *(*gem_prime_import_sg_table)(
432 struct drm_device *dev,
433 struct dma_buf_attachment *attach,
434 struct sg_table *sgt);
438 * Deprecated vmap hook for GEM drivers. Please use
439 * &drm_gem_object_funcs.vmap instead.
441 void *(*gem_prime_vmap)(struct drm_gem_object *obj);
446 * Deprecated vunmap hook for GEM drivers. Please use
447 * &drm_gem_object_funcs.vunmap instead.
449 void (*gem_prime_vunmap)(struct drm_gem_object *obj, void *vaddr);
454 * mmap hook for GEM drivers, used to implement dma-buf mmap in the
457 * FIXME: There's way too much duplication going on here, and also moved
458 * to &drm_gem_object_funcs.
460 int (*gem_prime_mmap)(struct drm_gem_object *obj,
461 struct vm_area_struct *vma);
466 * This creates a new dumb buffer in the driver's backing storage manager (GEM,
467 * TTM or something else entirely) and returns the resulting buffer handle. This
468 * handle can then be wrapped up into a framebuffer modeset object.
470 * Note that userspace is not allowed to use such objects for render
471 * acceleration - drivers must create their own private ioctls for such a use
474 * Width, height and depth are specified in the &drm_mode_create_dumb
475 * argument. The callback needs to fill the handle, pitch and size for
476 * the created buffer.
478 * Called by the user via ioctl.
482 * Zero on success, negative errno on failure.
484 int (*dumb_create)(struct drm_file *file_priv,
485 struct drm_device *dev,
486 struct drm_mode_create_dumb *args);
490 * Allocate an offset in the drm device node's address space to be able to
491 * memory map a dumb buffer.
493 * The default implementation is drm_gem_create_mmap_offset(). GEM based
494 * drivers must not overwrite this.
496 * Called by the user via ioctl.
500 * Zero on success, negative errno on failure.
502 int (*dumb_map_offset)(struct drm_file *file_priv,
503 struct drm_device *dev, uint32_t handle,
508 * This destroys the userspace handle for the given dumb backing storage buffer.
509 * Since buffer objects must be reference counted in the kernel a buffer object
510 * won't be immediately freed if a framebuffer modeset object still uses it.
512 * Called by the user via ioctl.
514 * The default implementation is drm_gem_dumb_destroy(). GEM based drivers
515 * must not overwrite this.
519 * Zero on success, negative errno on failure.
521 int (*dumb_destroy)(struct drm_file *file_priv,
522 struct drm_device *dev,
526 * @gem_vm_ops: Driver private ops for this object
528 * For GEM drivers this is deprecated in favour of
529 * &drm_gem_object_funcs.vm_ops.
531 const struct vm_operations_struct *gem_vm_ops;
533 /** @major: driver major number */
535 /** @minor: driver minor number */
537 /** @patchlevel: driver patch level */
539 /** @name: driver name */
541 /** @desc: driver description */
543 /** @date: driver date */
548 * Driver features, see &enum drm_driver_feature. Drivers can disable
549 * some features on a per-instance basis using
550 * &drm_device.driver_features.
557 * Array of driver-private IOCTL description entries. See the chapter on
558 * :ref:`IOCTL support in the userland interfaces
559 * chapter<drm_driver_ioctl>` for the full details.
562 const struct drm_ioctl_desc *ioctls;
563 /** @num_ioctls: Number of entries in @ioctls. */
569 * File operations for the DRM device node. See the discussion in
570 * :ref:`file operations<drm_driver_fops>` for in-depth coverage and
573 const struct file_operations *fops;
575 /* Everything below here is for legacy driver, never use! */
578 /* List of devices hanging off this driver with stealth attach. */
579 struct list_head legacy_dev_list;
580 int (*firstopen) (struct drm_device *);
581 void (*preclose) (struct drm_device *, struct drm_file *file_priv);
582 int (*dma_ioctl) (struct drm_device *dev, void *data, struct drm_file *file_priv);
583 int (*dma_quiescent) (struct drm_device *);
584 int (*context_dtor) (struct drm_device *dev, int context);
585 u32 (*get_vblank_counter)(struct drm_device *dev, unsigned int pipe);
586 int (*enable_vblank)(struct drm_device *dev, unsigned int pipe);
587 void (*disable_vblank)(struct drm_device *dev, unsigned int pipe);
591 void *__devm_drm_dev_alloc(struct device *parent, struct drm_driver *driver,
592 size_t size, size_t offset);
595 * devm_drm_dev_alloc - Resource managed allocation of a &drm_device instance
596 * @parent: Parent device object
597 * @driver: DRM driver
598 * @type: the type of the struct which contains struct &drm_device
599 * @member: the name of the &drm_device within @type.
601 * This allocates and initialize a new DRM device. No device registration is done.
602 * Call drm_dev_register() to advertice the device to user space and register it
603 * with other core subsystems. This should be done last in the device
604 * initialization sequence to make sure userspace can't access an inconsistent
607 * The initial ref-count of the object is 1. Use drm_dev_get() and
608 * drm_dev_put() to take and drop further ref-counts.
610 * It is recommended that drivers embed &struct drm_device into their own device
613 * Note that this manages the lifetime of the resulting &drm_device
614 * automatically using devres. The DRM device initialized with this function is
615 * automatically put on driver detach using drm_dev_put().
618 * Pointer to new DRM device, or ERR_PTR on failure.
620 #define devm_drm_dev_alloc(parent, driver, type, member) \
621 ((type *) __devm_drm_dev_alloc(parent, driver, sizeof(type), \
622 offsetof(type, member)))
624 struct drm_device *drm_dev_alloc(struct drm_driver *driver,
625 struct device *parent);
626 int drm_dev_register(struct drm_device *dev, unsigned long flags);
627 void drm_dev_unregister(struct drm_device *dev);
629 void drm_dev_get(struct drm_device *dev);
630 void drm_dev_put(struct drm_device *dev);
631 void drm_put_dev(struct drm_device *dev);
632 bool drm_dev_enter(struct drm_device *dev, int *idx);
633 void drm_dev_exit(int idx);
634 void drm_dev_unplug(struct drm_device *dev);
637 * drm_dev_is_unplugged - is a DRM device unplugged
640 * This function can be called to check whether a hotpluggable is unplugged.
641 * Unplugging itself is singalled through drm_dev_unplug(). If a device is
642 * unplugged, these two functions guarantee that any store before calling
643 * drm_dev_unplug() is visible to callers of this function after it completes
645 * WARNING: This function fundamentally races against drm_dev_unplug(). It is
646 * recommended that drivers instead use the underlying drm_dev_enter() and
647 * drm_dev_exit() function pairs.
649 static inline bool drm_dev_is_unplugged(struct drm_device *dev)
653 if (drm_dev_enter(dev, &idx)) {
662 * drm_core_check_all_features - check driver feature flags mask
663 * @dev: DRM device to check
664 * @features: feature flag(s) mask
666 * This checks @dev for driver features, see &drm_driver.driver_features,
667 * &drm_device.driver_features, and the various &enum drm_driver_feature flags.
669 * Returns true if all features in the @features mask are supported, false
672 static inline bool drm_core_check_all_features(const struct drm_device *dev,
675 u32 supported = dev->driver->driver_features & dev->driver_features;
677 return features && (supported & features) == features;
681 * drm_core_check_feature - check driver feature flags
682 * @dev: DRM device to check
683 * @feature: feature flag
685 * This checks @dev for driver features, see &drm_driver.driver_features,
686 * &drm_device.driver_features, and the various &enum drm_driver_feature flags.
688 * Returns true if the @feature is supported, false otherwise.
690 static inline bool drm_core_check_feature(const struct drm_device *dev,
691 enum drm_driver_feature feature)
693 return drm_core_check_all_features(dev, feature);
697 * drm_drv_uses_atomic_modeset - check if the driver implements
701 * This check is useful if drivers do not have DRIVER_ATOMIC set but
702 * have atomic modesetting internally implemented.
704 static inline bool drm_drv_uses_atomic_modeset(struct drm_device *dev)
706 return drm_core_check_feature(dev, DRIVER_ATOMIC) ||
707 (dev->mode_config.funcs && dev->mode_config.funcs->atomic_commit != NULL);
711 int drm_dev_set_unique(struct drm_device *dev, const char *name);