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PATH: usr / src / kernels / 5.14.0-611.49.2.el9_7.x86_64 / include / drm

/* SPDX-License-Identifier: MIT */
#ifndef _DRM_PAGEMAP_H_
#define _DRM_PAGEMAP_H_

#include <linux/dma-direction.h>
#include <linux/hmm.h>
#include <linux/types.h>

struct drm_pagemap;
struct device;

/**
 * enum drm_interconnect_protocol - Used to identify an interconnect protocol.
 *
 * @DRM_INTERCONNECT_SYSTEM: DMA map is system pages
 * @DRM_INTERCONNECT_DRIVER: DMA map is driver defined
 */
enum drm_interconnect_protocol {
	DRM_INTERCONNECT_SYSTEM,
	DRM_INTERCONNECT_DRIVER,
	/* A driver can add private values beyond DRM_INTERCONNECT_DRIVER */
};

/**
 * struct drm_pagemap_device_addr - Device address representation.
 * @addr: The dma address or driver-defined address for driver private interconnects.
 * @proto: The interconnect protocol.
 * @order: The page order of the device mapping. (Size is PAGE_SIZE << order).
 * @dir: The DMA direction.
 *
 * Note: There is room for improvement here. We should be able to pack into
 * 64 bits.
 */
struct drm_pagemap_device_addr {
	dma_addr_t addr;
	u64 proto : 54;
	u64 order : 8;
	u64 dir : 2;
};

/**
 * drm_pagemap_device_addr_encode() - Encode a dma address with metadata
 * @addr: The dma address or driver-defined address for driver private interconnects.
 * @proto: The interconnect protocol.
 * @order: The page order of the dma mapping. (Size is PAGE_SIZE << order).
 * @dir: The DMA direction.
 *
 * Return: A struct drm_pagemap_device_addr encoding the above information.
 */
static inline struct drm_pagemap_device_addr
drm_pagemap_device_addr_encode(dma_addr_t addr,
			       enum drm_interconnect_protocol proto,
			       unsigned int order,
			       enum dma_data_direction dir)
{
	return (struct drm_pagemap_device_addr) {
		.addr = addr,
		.proto = proto,
		.order = order,
		.dir = dir,
	};
}

/**
 * struct drm_pagemap_ops: Ops for a drm-pagemap.
 */
struct drm_pagemap_ops {
	/**
	 * @device_map: Map for device access or provide a virtual address suitable for
	 *
	 * @dpagemap: The struct drm_pagemap for the page.
	 * @dev: The device mapper.
	 * @page: The page to map.
	 * @order: The page order of the device mapping. (Size is PAGE_SIZE << order).
	 * @dir: The transfer direction.
	 */
	struct drm_pagemap_device_addr (*device_map)(struct drm_pagemap *dpagemap,
						     struct device *dev,
						     struct page *page,
						     unsigned int order,
						     enum dma_data_direction dir);

/**
	 * @device_unmap: Unmap a device address previously obtained using @device_map.
	 *
	 * @dpagemap: The struct drm_pagemap for the mapping.
	 * @dev: The device unmapper.
	 * @addr: The device address obtained when mapping.
	 */
	void (*device_unmap)(struct drm_pagemap *dpagemap,
			     struct device *dev,
			     struct drm_pagemap_device_addr addr);

};

/**
 * struct drm_pagemap: Additional information for a struct dev_pagemap
 * used for device p2p handshaking.
 * @ops: The struct drm_pagemap_ops.
 * @dev: The struct drevice owning the device-private memory.
 */
struct drm_pagemap {
	const struct drm_pagemap_ops *ops;
	struct device *dev;
};

#endif

[-] drm_eld.h [edit]
[-] drm_bridge.h [edit]
[-] spsc_queue.h [edit]
[-] drm_gem_dma_helper.h [edit]
[-] drm_property.h [edit]
[-] drm_auth.h [edit]
[-] drm_mipi_dbi.h [edit]
[-] drm_mode_object.h [edit]
[-] drm_pciids.h [edit]
[+] ttm
[-] drm_privacy_screen_machine.h [edit]
[-] drm_fixed.h [edit]
[-] drm_fb_helper.h [edit]
[-] drm_gem_ttm_helper.h [edit]
[-] drm_pagemap.h [edit]
[-] drm_atomic_uapi.h [edit]
[-] drm_module.h [edit]
[+] display
[-] drm_encoder.h [edit]
[-] drm_file.h [edit]
[-] drm_connector.h [edit]
[-] drm_utils.h [edit]
[-] drm_suballoc.h [edit]
[+] intel
[-] drm_audio_component.h [edit]
[-] drm_prime.h [edit]
[-] drm_atomic_helper.h [edit]
[-] i915_pciids.h [edit]
[-] drm_mipi_dsi.h [edit]
[-] drm_writeback.h [edit]
[-] drm_gem_framebuffer_helper.h [edit]
[-] drm_lease.h [edit]
[-] drm_crtc_helper.h [edit]
[-] drm_client.h [edit]
[-] Makefile [edit]
[-] drm_vblank.h [edit]
[-] drm_format_helper.h [edit]
[-] drm_fb_dma_helper.h [edit]
[-] drm_mode_config.h [edit]
[-] drm_debugfs.h [edit]
[-] drm_print.h [edit]
[-] drm_client_event.h [edit]
[-] drm_panel.h [edit]
[-] drm_gem_shmem_helper.h [edit]
[-] drm_debugfs_crc.h [edit]
[-] drm_cache.h [edit]
[-] drm_sysfs.h [edit]
[+] clients
[-] drm_edid.h [edit]
[-] drm_modeset_helper.h [edit]
[-] drm_atomic_state_helper.h [edit]
[-] drm_ioctl.h [edit]
[-] drm_blend.h [edit]
[-] drm_gem_vram_helper.h [edit]
[-] drm_panic.h [edit]
[-] drm_plane_helper.h [edit]
[-] drm_fbdev_dma.h [edit]
[-] drm_bridge_connector.h [edit]
[-] drm_probe_helper.h [edit]
[-] drm_modeset_helper_vtables.h [edit]
[-] drm_device.h [edit]
[-] drm_exec.h [edit]
[-] drm_atomic.h [edit]
[-] gud.h [edit]
[-] drm_gem.h [edit]
[-] drm_gpuvm.h [edit]
[-] drm_mm.h [edit]
[-] drm_plane.h [edit]
[-] drm_gpusvm.h [edit]
[-] drm_simple_kms_helper.h [edit]
[-] drm_syncobj.h [edit]
[-] drm_gem_atomic_helper.h [edit]
[-] drm_fbdev_shmem.h [edit]
[-] drm_framebuffer.h [edit]
[-] drm_accel.h [edit]
[-] drm_self_refresh_helper.h [edit]
[-] amd_asic_type.h [edit]
[-] drm_privacy_screen_consumer.h [edit]
[-] gpu_scheduler.h [edit]
[-] drm_fbdev_ttm.h [edit]
[-] drm_managed.h [edit]
[-] task_barrier.h [edit]
[-] drm_fourcc.h [edit]
[-] drm_vblank_work.h [edit]
[-] drm_modes.h [edit]
[-] drm_vma_manager.h [edit]
[-] drm_buddy.h [edit]
[-] drm_of.h [edit]
[+] ..
[+] bridge
[-] drm_modeset_lock.h [edit]
[-] drm_rect.h [edit]
[-] drm_flip_work.h [edit]
[-] drm_util.h [edit]
[-] drm_damage_helper.h [edit]
[-] drm_drv.h [edit]
[-] drm_kunit_helpers.h [edit]
[-] drm_color_mgmt.h [edit]
[-] drm_crtc.h [edit]
[-] drm_privacy_screen_driver.h [edit]