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| -rw-r--r-- | include/drm/drm_drv.h | 607 |
1 files changed, 607 insertions, 0 deletions
diff --git a/include/drm/drm_drv.h b/include/drm/drm_drv.h new file mode 100644 index 000000000..f6159acb8 --- /dev/null +++ b/include/drm/drm_drv.h @@ -0,0 +1,607 @@ +/* + * 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. 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: + * + * 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. + * + * This hook only exists for historical reasons. Drivers must use + * drm_gem_prime_mmap() to implement it. + * + * FIXME: Convert all drivers to implement mmap in struct + * &drm_gem_object_funcs and inline drm_gem_prime_mmap() into + * its callers. This hook should be removed afterwards. + */ + 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); + +extern bool drm_firmware_drivers_only(void); + +#endif |