linux内核amdgpu源码解析

drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c

module_init(amdgpu_init);
module_exit(amdgpu_exit);

MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL and additional rights");

drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c

static void __exit amdgpu_exit(void)
{
	amdgpu_amdkfd_fini();
	pci_unregister_driver(pdriver);
	amdgpu_unregister_atpx_handler();
	amdgpu_sync_fini();
	amdgpu_fence_slab_fini();
}

static int __init amdgpu_init(void)
{
	int r;

	if (vgacon_text_force()) {
		DRM_ERROR("VGACON disables amdgpu kernel modesetting.\n");
		return -EINVAL;
	}

	r = amdgpu_sync_init();
	if (r)
		goto error_sync;

	r = amdgpu_fence_slab_init();
	if (r)
		goto error_fence;

	DRM_INFO("amdgpu kernel modesetting enabled.\n");
	driver = &kms_driver;
	pdriver = &amdgpu_kms_pci_driver;
	driver->num_ioctls = amdgpu_max_kms_ioctl;
	amdgpu_register_atpx_handler();
	/* let modprobe override vga console setting */
	return pci_register_driver(pdriver);

error_fence:
	amdgpu_sync_fini();

error_sync:
	return r;
}

drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c

static struct drm_driver *driver;
static struct pci_driver *pdriver;

static struct drm_driver kms_driver = {
	.driver_features =
	    DRIVER_USE_AGP |
	    DRIVER_HAVE_IRQ | DRIVER_IRQ_SHARED | DRIVER_GEM |
	    DRIVER_PRIME | DRIVER_RENDER | DRIVER_MODESET | DRIVER_SYNCOBJ,
	.load = amdgpu_driver_load_kms,
	.open = amdgpu_driver_open_kms,
	.postclose = amdgpu_driver_postclose_kms,
	.lastclose = amdgpu_driver_lastclose_kms,
	.unload = amdgpu_driver_unload_kms,
	.get_vblank_counter = amdgpu_get_vblank_counter_kms,
	.enable_vblank = amdgpu_enable_vblank_kms,
	.disable_vblank = amdgpu_disable_vblank_kms,
	.get_vblank_timestamp = drm_calc_vbltimestamp_from_scanoutpos,
	.get_scanout_position = amdgpu_get_crtc_scanout_position,
	.irq_handler = amdgpu_irq_handler,
	.ioctls = amdgpu_ioctls_kms,
	.gem_free_object_unlocked = amdgpu_gem_object_free,
	.gem_open_object = amdgpu_gem_object_open,
	.gem_close_object = amdgpu_gem_object_close,
	.dumb_create = amdgpu_mode_dumb_create,
	.dumb_map_offset = amdgpu_mode_dumb_mmap,
	.fops = &amdgpu_driver_kms_fops,

	.prime_handle_to_fd = drm_gem_prime_handle_to_fd,
	.prime_fd_to_handle = drm_gem_prime_fd_to_handle,
	.gem_prime_export = amdgpu_gem_prime_export,
	.gem_prime_import = amdgpu_gem_prime_import,
	.gem_prime_res_obj = amdgpu_gem_prime_res_obj,
	.gem_prime_get_sg_table = amdgpu_gem_prime_get_sg_table,
	.gem_prime_import_sg_table = amdgpu_gem_prime_import_sg_table,
	.gem_prime_vmap = amdgpu_gem_prime_vmap,
	.gem_prime_vunmap = amdgpu_gem_prime_vunmap,
	.gem_prime_mmap = amdgpu_gem_prime_mmap,

	.name = DRIVER_NAME,
	.desc = DRIVER_DESC,
	.date = DRIVER_DATE,
	.major = KMS_DRIVER_MAJOR,
	.minor = KMS_DRIVER_MINOR,
	.patchlevel = KMS_DRIVER_PATCHLEVEL,
};

static struct pci_driver amdgpu_kms_pci_driver = {
	.name = DRIVER_NAME,
	.id_table = pciidlist,
	.probe = amdgpu_pci_probe,
	.remove = amdgpu_pci_remove,
	.shutdown = amdgpu_pci_shutdown,
	.driver.pm = &amdgpu_pm_ops,
};

include/drm/drm_drv.h

/**
 * struct drm_driver - DRM driver structure
 *
 * This structure represent the common code for a family of cards. There will
 * one 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 drm_dev_init() 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. Drivers
	 * using this callback are responsible for calling drm_dev_fini()
	 * to finalize the device and then freeing the struct themselves.
	 */
	void (*release) (struct drm_device *);

	/**
	 * @get_vblank_counter:
	 *
	 * Driver callback for fetching a raw hardware vblank counter for the
	 * CRTC specified with the pipe argument.  If a device doesn't have a
	 * hardware counter, the driver can simply leave the hook as NULL.
	 * The DRM core will account for missed vblank events while interrupts
	 * where disabled based on system timestamps.
	 *
	 * Wraparound handling and loss of events due to modesetting is dealt
	 * with in the DRM core code, as long as drivers call
	 * drm_crtc_vblank_off() and drm_crtc_vblank_on() when disabling or
	 * enabling a CRTC.
	 *
	 * This is deprecated and should not be used by new drivers.
	 * Use &drm_crtc_funcs.get_vblank_counter instead.
	 *
	 * Returns:
	 *
	 * Raw vblank counter value.
	 */
	u32 (*get_vblank_counter) (struct drm_device *dev, unsigned int pipe);

	/**
	 * @enable_vblank:
	 *
	 * Enable vblank interrupts for the CRTC specified with the pipe
	 * argument.
	 *
	 * This is deprecated and should not be used by new drivers.
	 * Use &drm_crtc_funcs.enable_vblank instead.
	 *
	 * Returns:
	 *
	 * Zero on success, appropriate errno if the given @crtc's vblank
	 * interrupt cannot be enabled.
	 */
	int (*enable_vblank) (struct drm_device *dev, unsigned int pipe);

	/**
	 * @disable_vblank:
	 *
	 * Disable vblank interrupts for the CRTC specified with the pipe
	 * argument.
	 *
	 * This is deprecated and should not be used by new drivers.
	 * Use &drm_crtc_funcs.disable_vblank instead.
	 */
	void (*disable_vblank) (struct drm_device *dev, unsigned int pipe);

	/**
	 * @get_scanout_position:
	 *
	 * Called by vblank timestamping code.
	 *
	 * Returns the current display scanout position from a crtc, and an
	 * optional accurate ktime_get() timestamp of when position was
	 * measured. Note that this is a helper callback which is only used if a
	 * driver uses drm_calc_vbltimestamp_from_scanoutpos() for the
	 * @get_vblank_timestamp callback.
	 *
	 * Parameters:
	 *
	 * dev:
	 *     DRM device.
	 * pipe:
	 *     Id of the crtc to query.
	 * in_vblank_irq:
	 *     True when called from drm_crtc_handle_vblank().  Some drivers
	 *     need to apply some workarounds for gpu-specific vblank irq quirks
	 *     if flag is set.
	 * vpos:
	 *     Target location for current vertical scanout position.
	 * hpos:
	 *     Target location for current horizontal scanout position.
	 * stime:
	 *     Target location for timestamp taken immediately before
	 *     scanout position query. Can be NULL to skip timestamp.
	 * etime:
	 *     Target location for timestamp taken immediately after
	 *     scanout position query. Can be NULL to skip timestamp.
	 * mode:
	 *     Current display timings.
	 *
	 * Returns vpos as a positive number while in active scanout area.
	 * Returns vpos as a negative number inside vblank, counting the number
	 * of scanlines to go until end of vblank, e.g., -1 means "one scanline
	 * until start of active scanout / end of vblank."
	 *
	 * Returns:
	 *
	 * True on success, false if a reliable scanout position counter could
	 * not be read out.
	 *
	 * FIXME:
	 *
	 * Since this is a helper to implement @get_vblank_timestamp, we should
	 * move it to &struct drm_crtc_helper_funcs, like all the other
	 * helper-internal hooks.
	 */
	bool (*get_scanout_position) (struct drm_device *dev, unsigned int pipe,
				      bool in_vblank_irq, int *vpos, int *hpos,
				      ktime_t *stime, ktime_t *etime,
				      const struct drm_display_mode *mode);

	/**
	 * @get_vblank_timestamp:
	 *
	 * Called by drm_get_last_vbltimestamp(). Should return a precise
	 * timestamp when the most recent VBLANK interval ended or will end.
	 *
	 * Specifically, the timestamp in @vblank_time should correspond as
	 * closely as possible to the time when the first video scanline of
	 * the video frame after the end of VBLANK will start scanning out,
	 * the time immediately after end of the VBLANK interval. If the
	 * @crtc is currently inside VBLANK, this will be a time in the future.
	 * If the @crtc is currently scanning out a frame, this will be the
	 * past start time of the current scanout. This is meant to adhere
	 * to the OpenML OML_sync_control extension specification.
	 *
	 * Paramters:
	 *
	 * dev:
	 *     dev DRM device handle.
	 * pipe:
	 *     crtc for which timestamp should be returned.
	 * max_error:
	 *     Maximum allowable timestamp error in nanoseconds.
	 *     Implementation should strive to provide timestamp
	 *     with an error of at most max_error nanoseconds.
	 *     Returns true upper bound on error for timestamp.
	 * vblank_time:
	 *     Target location for returned vblank timestamp.
	 * in_vblank_irq:
	 *     True when called from drm_crtc_handle_vblank().  Some drivers
	 *     need to apply some workarounds for gpu-specific vblank irq quirks
	 *     if flag is set.
	 *
	 * Returns:
	 *
	 * True on success, false on failure, which means the core should
	 * fallback to a simple timestamp taken in drm_crtc_handle_vblank().
	 *
	 * FIXME:
	 *
	 * We should move this hook to &struct drm_crtc_funcs like all the other
	 * vblank hooks.
	 */
	bool (*get_vblank_timestamp) (struct drm_device *dev, unsigned int pipe,
				     int *max_error,
				     ktime_t *vblank_time,
				     bool in_vblank_irq);

	/**
	 * @irq_handler:
	 *
	 * Interrupt handler called when using drm_irq_install(). Not used by
	 * drivers which implement their own interrupt handling.
	 */
	irqreturn_t(*irq_handler) (int irq, void *arg);

	/**
	 * @irq_preinstall:
	 *
	 * Optional callback used by drm_irq_install() which is called before
	 * the interrupt handler is registered. This should be used to clear out
	 * any pending interrupts (from e.g. firmware based drives) and reset
	 * the interrupt handling registers.
	 */
	void (*irq_preinstall) (struct drm_device *dev);

	/**
	 * @irq_postinstall:
	 *
	 * Optional callback used by drm_irq_install() which is called after
	 * the interrupt handler is registered. This should be used to enable
	 * interrupt generation in the hardware.
	 */
	int (*irq_postinstall) (struct drm_device *dev);

	/**
	 * @irq_uninstall:
	 *
	 * Optional callback used by drm_irq_uninstall() which is called before
	 * the interrupt handler is unregistered. This should be used to disable
	 * interrupt generation in the hardware.
	 */
	void (*irq_uninstall) (struct drm_device *dev);

	/**
	 * @master_create:
	 *
	 * Called whenever a new master is created. Only used by vmwgfx.
	 */
	int (*master_create)(struct drm_device *dev, struct drm_master *master);

	/**
	 * @master_destroy:
	 *
	 * Called whenever a master is destroyed. Only used by vmwgfx.
	 */
	void (*master_destroy)(struct drm_device *dev, struct drm_master *master);

	/**
	 * @master_set:
	 *
	 * Called whenever the minor master is set. Only used by vmwgfx.
	 */
	int (*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.
	 */
	int (*debugfs_init)(struct drm_minor *minor);

	/**
	 * @gem_free_object: deconstructor for drm_gem_objects
	 *
	 * This is deprecated and should not be used by new drivers. Use
	 * @gem_free_object_unlocked instead.
	 */
	void (*gem_free_object) (struct drm_gem_object *obj);

	/**
	 * @gem_free_object_unlocked: deconstructor for drm_gem_objects
	 *
	 * This is for drivers which are not encumbered with &drm_device.struct_mutex
	 * legacy locking schemes. Use this hook instead of @gem_free_object.
	 */
	void (*gem_free_object_unlocked) (struct drm_gem_object *obj);

	/**
	 * @gem_open_object:
	 *
	 * Driver hook called upon gem handle creation
	 */
	int (*gem_open_object) (struct drm_gem_object *, struct drm_file *);

	/**
	 * @gem_close_object:
	 *
	 * Driver hook called upon gem handle release
	 */
	void (*gem_close_object) (struct drm_gem_object *, struct drm_file *);

	/**
	 * @gem_print_info:
	 *
	 * If driver subclasses struct &drm_gem_object, it can implement this
	 * optional hook for printing additional driver specific info.
	 *
	 * drm_printf_indent() should be used in the callback passing it the
	 * indent argument.
	 *
	 * This callback is called from drm_gem_print_info().
	 */
	void (*gem_print_info)(struct drm_printer *p, unsigned int indent,
			       const struct drm_gem_object *obj);

	/**
	 * @gem_create_object: constructor for gem objects
	 *
	 * Hook for allocating the GEM object struct, for use by core
	 * helpers.
	 */
	struct drm_gem_object *(*gem_create_object)(struct drm_device *dev,
						    size_t size);

	/* prime: */
	/**
	 * @prime_handle_to_fd:
	 *
	 * export handle -> fd (see drm_gem_prime_handle_to_fd() helper)
	 */
	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:
	 *
	 * import fd -> handle (see drm_gem_prime_fd_to_handle() helper)
	 */
	int (*prime_fd_to_handle)(struct drm_device *dev, struct drm_file *file_priv,
				int prime_fd, uint32_t *handle);
	/**
	 * @gem_prime_export:
	 *
	 * export GEM -> dmabuf
	 */
	struct dma_buf * (*gem_prime_export)(struct drm_device *dev,
				struct drm_gem_object *obj, int flags);
	/**
	 * @gem_prime_import:
	 *
	 * import dmabuf -> GEM
	 */
	struct drm_gem_object * (*gem_prime_import)(struct drm_device *dev,
				struct dma_buf *dma_buf);
	int (*gem_prime_pin)(struct drm_gem_object *obj);
	void (*gem_prime_unpin)(struct drm_gem_object *obj);
	struct reservation_object * (*gem_prime_res_obj)(
				struct drm_gem_object *obj);
	struct sg_table *(*gem_prime_get_sg_table)(struct drm_gem_object *obj);
	struct drm_gem_object *(*gem_prime_import_sg_table)(
				struct drm_device *dev,
				struct dma_buf_attachment *attach,
				struct sg_table *sgt);
	void *(*gem_prime_vmap)(struct drm_gem_object *obj);
	void (*gem_prime_vunmap)(struct drm_gem_object *obj, void *vaddr);
	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. GEM-based drivers must use
	 * drm_gem_create_mmap_offset() to implement 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.
	 *
	 * Returns:
	 *
	 * Zero on success, negative errno on failure.
	 */
	int (*dumb_destroy)(struct drm_file *file_priv,
			    struct drm_device *dev,
			    uint32_t handle);

	/**
	 * @gem_vm_ops: Driver private ops for this object
	 */
	const struct vm_operations_struct *gem_vm_ops;

	/** @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 */
	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;

	/* Everything below here is for legacy driver, never use! */
	/* private: */

	/* List of devices hanging off this driver with stealth attach. */
	struct list_head legacy_dev_list;
	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);
	int dev_priv_size;
};

include/linux/pci.h

struct pci_driver {
	struct list_head	node;
	const char		*name;
	const struct pci_device_id *id_table;	/* Must be non-NULL for probe to be called */
	int  (*probe)(struct pci_dev *dev, const struct pci_device_id *id);	/* New device inserted */
	void (*remove)(struct pci_dev *dev);	/* Device removed (NULL if not a hot-plug capable driver) */
	int  (*suspend)(struct pci_dev *dev, pm_message_t state);	/* Device suspended */
	int  (*suspend_late)(struct pci_dev *dev, pm_message_t state);
	int  (*resume_early)(struct pci_dev *dev);
	int  (*resume) (struct pci_dev *dev);	/* Device woken up */
	void (*shutdown) (struct pci_dev *dev);
	int  (*sriov_configure) (struct pci_dev *dev, int num_vfs); /* On PF */
	const struct pci_error_handlers *err_handler;
	const struct attribute_group **groups;
	struct device_driver	driver;
	struct pci_dynids	dynids;
};