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.
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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),
110 * Driver supports user defined GPU VA bindings for GEM objects.
112 DRIVER_GEM_GPUVA = BIT(8),
114 * @DRIVER_CURSOR_HOTSPOT:
116 * Driver supports and requires cursor hotspot information in the
117 * cursor plane (e.g. cursor plane has to actually track the mouse
118 * cursor and the clients are required to set hotspot in order for
119 * the cursor planes to work correctly).
121 DRIVER_CURSOR_HOTSPOT = BIT(9),
123 /* IMPORTANT: Below are all the legacy flags, add new ones above. */
128 * Set up DRM AGP support, see drm_agp_init(), the DRM core will manage
129 * AGP resources. New drivers don't need this.
131 DRIVER_USE_AGP = BIT(25),
135 * Denote a legacy driver using shadow attach. Do not use.
137 DRIVER_LEGACY = BIT(26),
141 * Driver is capable of PCI DMA, mapping of PCI DMA buffers to userspace
142 * will be enabled. Only for legacy drivers. Do not use.
144 DRIVER_PCI_DMA = BIT(27),
148 * Driver can perform scatter/gather DMA, allocation and mapping of
149 * scatter/gather buffers will be enabled. Only for legacy drivers. Do
157 * Driver supports DMA, the userspace DMA API will be supported. Only
158 * for legacy drivers. Do not use.
160 DRIVER_HAVE_DMA = BIT(29),
164 * Legacy irq support. Only for legacy drivers. Do not use.
166 DRIVER_HAVE_IRQ = BIT(30),
170 * struct drm_driver - DRM driver structure
172 * This structure represent the common code for a family of cards. There will be
173 * one &struct drm_device for each card present in this family. It contains lots
174 * of vfunc entries, and a pile of those probably should be moved to more
175 * appropriate places like &drm_mode_config_funcs or into a new operations
176 * structure for GEM drivers.
182 * Backward-compatible driver callback to complete initialization steps
183 * after the driver is registered. For this reason, may suffer from
184 * race conditions and its use is deprecated for new drivers. It is
185 * therefore only supported for existing drivers not yet converted to
186 * the new scheme. See devm_drm_dev_alloc() and drm_dev_register() for
187 * proper and race-free way to set up a &struct drm_device.
189 * This is deprecated, do not use!
193 * Zero on success, non-zero value on failure.
195 int (*load) (struct drm_device *, unsigned long flags);
200 * Driver callback when a new &struct drm_file is opened. Useful for
201 * setting up driver-private data structures like buffer allocators,
202 * execution contexts or similar things. Such driver-private resources
203 * must be released again in @postclose.
205 * Since the display/modeset side of DRM can only be owned by exactly
206 * one &struct drm_file (see &drm_file.is_master and &drm_device.master)
207 * there should never be a need to set up any modeset related resources
208 * in this callback. Doing so would be a driver design bug.
212 * 0 on success, a negative error code on failure, which will be
213 * promoted to userspace as the result of the open() system call.
215 int (*open) (struct drm_device *, struct drm_file *);
220 * One of the driver callbacks when a new &struct drm_file is closed.
221 * Useful for tearing down driver-private data structures allocated in
222 * @open like buffer allocators, execution contexts or similar things.
224 * Since the display/modeset side of DRM can only be owned by exactly
225 * one &struct drm_file (see &drm_file.is_master and &drm_device.master)
226 * there should never be a need to tear down any modeset related
227 * resources in this callback. Doing so would be a driver design bug.
229 void (*postclose) (struct drm_device *, struct drm_file *);
234 * Called when the last &struct drm_file has been closed and there's
235 * currently no userspace client for the &struct drm_device.
237 * Modern drivers should only use this to force-restore the fbdev
238 * framebuffer using drm_fb_helper_restore_fbdev_mode_unlocked().
239 * Anything else would indicate there's something seriously wrong.
240 * Modern drivers can also use this to execute delayed power switching
241 * state changes, e.g. in conjunction with the :ref:`vga_switcheroo`
244 * This is called after @postclose hook has been called.
248 * All legacy drivers use this callback to de-initialize the hardware.
249 * This is purely because of the shadow-attach model, where the DRM
250 * kernel driver does not really own the hardware. Instead ownershipe is
251 * handled with the help of userspace through an inheritedly racy dance
252 * to set/unset the VT into raw mode.
254 * Legacy drivers initialize the hardware in the @firstopen callback,
255 * which isn't even called for modern drivers.
257 void (*lastclose) (struct drm_device *);
262 * Reverse the effects of the driver load callback. Ideally,
263 * the clean up performed by the driver should happen in the
264 * reverse order of the initialization. Similarly to the load
265 * hook, this handler is deprecated and its usage should be
266 * dropped in favor of an open-coded teardown function at the
267 * driver layer. See drm_dev_unregister() and drm_dev_put()
268 * for the proper way to remove a &struct drm_device.
270 * The unload() hook is called right after unregistering
274 void (*unload) (struct drm_device *);
279 * Optional callback for destroying device data after the final
280 * reference is released, i.e. the device is being destroyed.
282 * This is deprecated, clean up all memory allocations associated with a
283 * &drm_device using drmm_add_action(), drmm_kmalloc() and related
284 * managed resources functions.
286 void (*release) (struct drm_device *);
291 * Called whenever the minor master is set. Only used by vmwgfx.
293 void (*master_set)(struct drm_device *dev, struct drm_file *file_priv,
298 * Called whenever the minor master is dropped. Only used by vmwgfx.
300 void (*master_drop)(struct drm_device *dev, struct drm_file *file_priv);
305 * Allows drivers to create driver-specific debugfs files.
307 void (*debugfs_init)(struct drm_minor *minor);
310 * @gem_create_object: constructor for gem objects
312 * Hook for allocating the GEM object struct, for use by the CMA
313 * and SHMEM GEM helpers. Returns a GEM object on success, or an
314 * ERR_PTR()-encoded error code otherwise.
316 struct drm_gem_object *(*gem_create_object)(struct drm_device *dev,
320 * @prime_handle_to_fd:
322 * PRIME export function. Only used by vmwgfx.
324 int (*prime_handle_to_fd)(struct drm_device *dev, struct drm_file *file_priv,
325 uint32_t handle, uint32_t flags, int *prime_fd);
327 * @prime_fd_to_handle:
329 * PRIME import function. Only used by vmwgfx.
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);
357 * This creates a new dumb buffer in the driver's backing storage manager (GEM,
358 * TTM or something else entirely) and returns the resulting buffer handle. This
359 * handle can then be wrapped up into a framebuffer modeset object.
361 * Note that userspace is not allowed to use such objects for render
362 * acceleration - drivers must create their own private ioctls for such a use
365 * Width, height and depth are specified in the &drm_mode_create_dumb
366 * argument. The callback needs to fill the handle, pitch and size for
367 * the created buffer.
369 * Called by the user via ioctl.
373 * Zero on success, negative errno on failure.
375 int (*dumb_create)(struct drm_file *file_priv,
376 struct drm_device *dev,
377 struct drm_mode_create_dumb *args);
381 * Allocate an offset in the drm device node's address space to be able to
382 * memory map a dumb buffer.
384 * The default implementation is drm_gem_create_mmap_offset(). GEM based
385 * drivers must not overwrite this.
387 * Called by the user via ioctl.
391 * Zero on success, negative errno on failure.
393 int (*dumb_map_offset)(struct drm_file *file_priv,
394 struct drm_device *dev, uint32_t handle,
400 * Print device specific fdinfo. See Documentation/gpu/drm-usage-stats.rst.
402 void (*show_fdinfo)(struct drm_printer *p, struct drm_file *f);
404 /** @major: driver major number */
406 /** @minor: driver minor number */
408 /** @patchlevel: driver patch level */
410 /** @name: driver name */
412 /** @desc: driver description */
414 /** @date: driver date */
419 * Driver features, see &enum drm_driver_feature. Drivers can disable
420 * some features on a per-instance basis using
421 * &drm_device.driver_features.
428 * Array of driver-private IOCTL description entries. See the chapter on
429 * :ref:`IOCTL support in the userland interfaces
430 * chapter<drm_driver_ioctl>` for the full details.
433 const struct drm_ioctl_desc *ioctls;
434 /** @num_ioctls: Number of entries in @ioctls. */
440 * File operations for the DRM device node. See the discussion in
441 * :ref:`file operations<drm_driver_fops>` for in-depth coverage and
444 const struct file_operations *fops;
447 void *__devm_drm_dev_alloc(struct device *parent,
448 const struct drm_driver *driver,
449 size_t size, size_t offset);
452 * devm_drm_dev_alloc - Resource managed allocation of a &drm_device instance
453 * @parent: Parent device object
454 * @driver: DRM driver
455 * @type: the type of the struct which contains struct &drm_device
456 * @member: the name of the &drm_device within @type.
458 * This allocates and initialize a new DRM device. No device registration is done.
459 * Call drm_dev_register() to advertice the device to user space and register it
460 * with other core subsystems. This should be done last in the device
461 * initialization sequence to make sure userspace can't access an inconsistent
464 * The initial ref-count of the object is 1. Use drm_dev_get() and
465 * drm_dev_put() to take and drop further ref-counts.
467 * It is recommended that drivers embed &struct drm_device into their own device
470 * Note that this manages the lifetime of the resulting &drm_device
471 * automatically using devres. The DRM device initialized with this function is
472 * automatically put on driver detach using drm_dev_put().
475 * Pointer to new DRM device, or ERR_PTR on failure.
477 #define devm_drm_dev_alloc(parent, driver, type, member) \
478 ((type *) __devm_drm_dev_alloc(parent, driver, sizeof(type), \
479 offsetof(type, member)))
481 struct drm_device *drm_dev_alloc(const struct drm_driver *driver,
482 struct device *parent);
483 int drm_dev_register(struct drm_device *dev, unsigned long flags);
484 void drm_dev_unregister(struct drm_device *dev);
486 void drm_dev_get(struct drm_device *dev);
487 void drm_dev_put(struct drm_device *dev);
488 void drm_put_dev(struct drm_device *dev);
489 bool drm_dev_enter(struct drm_device *dev, int *idx);
490 void drm_dev_exit(int idx);
491 void drm_dev_unplug(struct drm_device *dev);
494 * drm_dev_is_unplugged - is a DRM device unplugged
497 * This function can be called to check whether a hotpluggable is unplugged.
498 * Unplugging itself is singalled through drm_dev_unplug(). If a device is
499 * unplugged, these two functions guarantee that any store before calling
500 * drm_dev_unplug() is visible to callers of this function after it completes
502 * WARNING: This function fundamentally races against drm_dev_unplug(). It is
503 * recommended that drivers instead use the underlying drm_dev_enter() and
504 * drm_dev_exit() function pairs.
506 static inline bool drm_dev_is_unplugged(struct drm_device *dev)
510 if (drm_dev_enter(dev, &idx)) {
519 * drm_core_check_all_features - check driver feature flags mask
520 * @dev: DRM device to check
521 * @features: feature flag(s) mask
523 * This checks @dev for driver features, see &drm_driver.driver_features,
524 * &drm_device.driver_features, and the various &enum drm_driver_feature flags.
526 * Returns true if all features in the @features mask are supported, false
529 static inline bool drm_core_check_all_features(const struct drm_device *dev,
532 u32 supported = dev->driver->driver_features & dev->driver_features;
534 return features && (supported & features) == features;
538 * drm_core_check_feature - check driver feature flags
539 * @dev: DRM device to check
540 * @feature: feature flag
542 * This checks @dev for driver features, see &drm_driver.driver_features,
543 * &drm_device.driver_features, and the various &enum drm_driver_feature flags.
545 * Returns true if the @feature is supported, false otherwise.
547 static inline bool drm_core_check_feature(const struct drm_device *dev,
548 enum drm_driver_feature feature)
550 return drm_core_check_all_features(dev, feature);
554 * drm_drv_uses_atomic_modeset - check if the driver implements
558 * This check is useful if drivers do not have DRIVER_ATOMIC set but
559 * have atomic modesetting internally implemented.
561 static inline bool drm_drv_uses_atomic_modeset(struct drm_device *dev)
563 return drm_core_check_feature(dev, DRIVER_ATOMIC) ||
564 (dev->mode_config.funcs && dev->mode_config.funcs->atomic_commit != NULL);
568 /* TODO: Inline drm_firmware_drivers_only() in all its callers. */
569 static inline bool drm_firmware_drivers_only(void)
571 return video_firmware_drivers_only();
574 #if defined(CONFIG_DEBUG_FS)
575 void drm_debugfs_dev_init(struct drm_device *dev, struct dentry *root);
577 static inline void drm_debugfs_dev_init(struct drm_device *dev, struct dentry *root)