drm/i915/uapi: reject caching ioctls for discrete

[linux-2.6-microblaze.git] / include / uapi / drm / i915_drm.h

/*
 * Copyright 2003 Tungsten Graphics, Inc., Cedar Park, Texas.
 * All Rights Reserved.
 *
 * 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, sub license, 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 NON-INFRINGEMENT.
 * IN NO EVENT SHALL TUNGSTEN GRAPHICS 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 _UAPI_I915_DRM_H_
#define _UAPI_I915_DRM_H_

#include "drm.h"

#if defined(__cplusplus)
extern "C" {
#endif

/* Please note that modifications to all structs defined here are
 * subject to backwards-compatibility constraints.
 */

/**
 * DOC: uevents generated by i915 on it's device node
 *
 * I915_L3_PARITY_UEVENT - Generated when the driver receives a parity mismatch
 *      event from the gpu l3 cache. Additional information supplied is ROW,
 *      BANK, SUBBANK, SLICE of the affected cacheline. Userspace should keep
 *      track of these events and if a specific cache-line seems to have a
 *      persistent error remap it with the l3 remapping tool supplied in
 *      intel-gpu-tools.  The value supplied with the event is always 1.
 *
 * I915_ERROR_UEVENT - Generated upon error detection, currently only via
 *      hangcheck. The error detection event is a good indicator of when things
 *      began to go badly. The value supplied with the event is a 1 upon error
 *      detection, and a 0 upon reset completion, signifying no more error
 *      exists. NOTE: Disabling hangcheck or reset via module parameter will
 *      cause the related events to not be seen.
 *
 * I915_RESET_UEVENT - Event is generated just before an attempt to reset the
 *      GPU. The value supplied with the event is always 1. NOTE: Disable
 *      reset via module parameter will cause this event to not be seen.
 */
#define I915_L3_PARITY_UEVENT           "L3_PARITY_ERROR"
#define I915_ERROR_UEVENT               "ERROR"
#define I915_RESET_UEVENT               "RESET"

/**
 * struct i915_user_extension - Base class for defining a chain of extensions
 *
 * Many interfaces need to grow over time. In most cases we can simply
 * extend the struct and have userspace pass in more data. Another option,
 * as demonstrated by Vulkan's approach to providing extensions for forward
 * and backward compatibility, is to use a list of optional structs to
 * provide those extra details.
 *
 * The key advantage to using an extension chain is that it allows us to
 * redefine the interface more easily than an ever growing struct of
 * increasing complexity, and for large parts of that interface to be
 * entirely optional. The downside is more pointer chasing; chasing across
 * the __user boundary with pointers encapsulated inside u64.
 *
 * Example chaining:
 *
 * .. code-block:: C
 *
 *      struct i915_user_extension ext3 {
 *              .next_extension = 0, // end
 *              .name = ...,
 *      };
 *      struct i915_user_extension ext2 {
 *              .next_extension = (uintptr_t)&ext3,
 *              .name = ...,
 *      };
 *      struct i915_user_extension ext1 {
 *              .next_extension = (uintptr_t)&ext2,
 *              .name = ...,
 *      };
 *
 * Typically the struct i915_user_extension would be embedded in some uAPI
 * struct, and in this case we would feed it the head of the chain(i.e ext1),
 * which would then apply all of the above extensions.
 *
 */
struct i915_user_extension {
        /**
         * @next_extension:
         *
         * Pointer to the next struct i915_user_extension, or zero if the end.
         */
        __u64 next_extension;
        /**
         * @name: Name of the extension.
         *
         * Note that the name here is just some integer.
         *
         * Also note that the name space for this is not global for the whole
         * driver, but rather its scope/meaning is limited to the specific piece
         * of uAPI which has embedded the struct i915_user_extension.
         */
        __u32 name;
        /**
         * @flags: MBZ
         *
         * All undefined bits must be zero.
         */
        __u32 flags;
        /**
         * @rsvd: MBZ
         *
         * Reserved for future use; must be zero.
         */
        __u32 rsvd[4];
};

/*
 * MOCS indexes used for GPU surfaces, defining the cacheability of the
 * surface data and the coherency for this data wrt. CPU vs. GPU accesses.
 */
enum i915_mocs_table_index {
        /*
         * Not cached anywhere, coherency between CPU and GPU accesses is
         * guaranteed.
         */
        I915_MOCS_UNCACHED,
        /*
         * Cacheability and coherency controlled by the kernel automatically
         * based on the DRM_I915_GEM_SET_CACHING IOCTL setting and the current
         * usage of the surface (used for display scanout or not).
         */
        I915_MOCS_PTE,
        /*
         * Cached in all GPU caches available on the platform.
         * Coherency between CPU and GPU accesses to the surface is not
         * guaranteed without extra synchronization.
         */
        I915_MOCS_CACHED,
};

/*
 * Different engines serve different roles, and there may be more than one
 * engine serving each role. enum drm_i915_gem_engine_class provides a
 * classification of the role of the engine, which may be used when requesting
 * operations to be performed on a certain subset of engines, or for providing
 * information about that group.
 */
enum drm_i915_gem_engine_class {
        I915_ENGINE_CLASS_RENDER        = 0,
        I915_ENGINE_CLASS_COPY          = 1,
        I915_ENGINE_CLASS_VIDEO         = 2,
        I915_ENGINE_CLASS_VIDEO_ENHANCE = 3,

        /* should be kept compact */

        I915_ENGINE_CLASS_INVALID       = -1
};

/*
 * There may be more than one engine fulfilling any role within the system.
 * Each engine of a class is given a unique instance number and therefore
 * any engine can be specified by its class:instance tuplet. APIs that allow
 * access to any engine in the system will use struct i915_engine_class_instance
 * for this identification.
 */
struct i915_engine_class_instance {
        __u16 engine_class; /* see enum drm_i915_gem_engine_class */
        __u16 engine_instance;
#define I915_ENGINE_CLASS_INVALID_NONE -1
#define I915_ENGINE_CLASS_INVALID_VIRTUAL -2
};

/**
 * DOC: perf_events exposed by i915 through /sys/bus/event_sources/drivers/i915
 *
 */

enum drm_i915_pmu_engine_sample {
        I915_SAMPLE_BUSY = 0,
        I915_SAMPLE_WAIT = 1,
        I915_SAMPLE_SEMA = 2
};

#define I915_PMU_SAMPLE_BITS (4)
#define I915_PMU_SAMPLE_MASK (0xf)
#define I915_PMU_SAMPLE_INSTANCE_BITS (8)
#define I915_PMU_CLASS_SHIFT \
        (I915_PMU_SAMPLE_BITS + I915_PMU_SAMPLE_INSTANCE_BITS)

#define __I915_PMU_ENGINE(class, instance, sample) \
        ((class) << I915_PMU_CLASS_SHIFT | \
        (instance) << I915_PMU_SAMPLE_BITS | \
        (sample))

#define I915_PMU_ENGINE_BUSY(class, instance) \
        __I915_PMU_ENGINE(class, instance, I915_SAMPLE_BUSY)

#define I915_PMU_ENGINE_WAIT(class, instance) \
        __I915_PMU_ENGINE(class, instance, I915_SAMPLE_WAIT)

#define I915_PMU_ENGINE_SEMA(class, instance) \
        __I915_PMU_ENGINE(class, instance, I915_SAMPLE_SEMA)

#define __I915_PMU_OTHER(x) (__I915_PMU_ENGINE(0xff, 0xff, 0xf) + 1 + (x))

#define I915_PMU_ACTUAL_FREQUENCY       __I915_PMU_OTHER(0)
#define I915_PMU_REQUESTED_FREQUENCY    __I915_PMU_OTHER(1)
#define I915_PMU_INTERRUPTS             __I915_PMU_OTHER(2)
#define I915_PMU_RC6_RESIDENCY          __I915_PMU_OTHER(3)
#define I915_PMU_SOFTWARE_GT_AWAKE_TIME __I915_PMU_OTHER(4)

#define I915_PMU_LAST /* Deprecated - do not use */ I915_PMU_RC6_RESIDENCY

/* Each region is a minimum of 16k, and there are at most 255 of them.
 */
#define I915_NR_TEX_REGIONS 255 /* table size 2k - maximum due to use
                                 * of chars for next/prev indices */
#define I915_LOG_MIN_TEX_REGION_SIZE 14

typedef struct _drm_i915_init {
        enum {
                I915_INIT_DMA = 0x01,
                I915_CLEANUP_DMA = 0x02,
                I915_RESUME_DMA = 0x03
        } func;
        unsigned int mmio_offset;
        int sarea_priv_offset;
        unsigned int ring_start;
        unsigned int ring_end;
        unsigned int ring_size;
        unsigned int front_offset;
        unsigned int back_offset;
        unsigned int depth_offset;
        unsigned int w;
        unsigned int h;
        unsigned int pitch;
        unsigned int pitch_bits;
        unsigned int back_pitch;
        unsigned int depth_pitch;
        unsigned int cpp;
        unsigned int chipset;
} drm_i915_init_t;

typedef struct _drm_i915_sarea {
        struct drm_tex_region texList[I915_NR_TEX_REGIONS + 1];
        int last_upload;        /* last time texture was uploaded */
        int last_enqueue;       /* last time a buffer was enqueued */
        int last_dispatch;      /* age of the most recently dispatched buffer */
        int ctxOwner;           /* last context to upload state */
        int texAge;
        int pf_enabled;         /* is pageflipping allowed? */
        int pf_active;
        int pf_current_page;    /* which buffer is being displayed? */
        int perf_boxes;         /* performance boxes to be displayed */
        int width, height;      /* screen size in pixels */

        drm_handle_t front_handle;
        int front_offset;
        int front_size;

        drm_handle_t back_handle;
        int back_offset;
        int back_size;

        drm_handle_t depth_handle;
        int depth_offset;
        int depth_size;

        drm_handle_t tex_handle;
        int tex_offset;
        int tex_size;
        int log_tex_granularity;
        int pitch;
        int rotation;           /* 0, 90, 180 or 270 */
        int rotated_offset;
        int rotated_size;
        int rotated_pitch;
        int virtualX, virtualY;

        unsigned int front_tiled;
        unsigned int back_tiled;
        unsigned int depth_tiled;
        unsigned int rotated_tiled;
        unsigned int rotated2_tiled;

        int pipeA_x;
        int pipeA_y;
        int pipeA_w;
        int pipeA_h;
        int pipeB_x;
        int pipeB_y;
        int pipeB_w;
        int pipeB_h;

        /* fill out some space for old userspace triple buffer */
        drm_handle_t unused_handle;
        __u32 unused1, unused2, unused3;

        /* buffer object handles for static buffers. May change
         * over the lifetime of the client.
         */
        __u32 front_bo_handle;
        __u32 back_bo_handle;
        __u32 unused_bo_handle;
        __u32 depth_bo_handle;

} drm_i915_sarea_t;

/* due to userspace building against these headers we need some compat here */
#define planeA_x pipeA_x
#define planeA_y pipeA_y
#define planeA_w pipeA_w
#define planeA_h pipeA_h
#define planeB_x pipeB_x
#define planeB_y pipeB_y
#define planeB_w pipeB_w
#define planeB_h pipeB_h

/* Flags for perf_boxes
 */
#define I915_BOX_RING_EMPTY    0x1
#define I915_BOX_FLIP          0x2
#define I915_BOX_WAIT          0x4
#define I915_BOX_TEXTURE_LOAD  0x8
#define I915_BOX_LOST_CONTEXT  0x10

/*
 * i915 specific ioctls.
 *
 * The device specific ioctl range is [DRM_COMMAND_BASE, DRM_COMMAND_END) ie
 * [0x40, 0xa0) (a0 is excluded). The numbers below are defined as offset
 * against DRM_COMMAND_BASE and should be between [0x0, 0x60).
 */
#define DRM_I915_INIT           0x00
#define DRM_I915_FLUSH          0x01
#define DRM_I915_FLIP           0x02
#define DRM_I915_BATCHBUFFER    0x03
#define DRM_I915_IRQ_EMIT       0x04
#define DRM_I915_IRQ_WAIT       0x05
#define DRM_I915_GETPARAM       0x06
#define DRM_I915_SETPARAM       0x07
#define DRM_I915_ALLOC          0x08
#define DRM_I915_FREE           0x09
#define DRM_I915_INIT_HEAP      0x0a
#define DRM_I915_CMDBUFFER      0x0b
#define DRM_I915_DESTROY_HEAP   0x0c
#define DRM_I915_SET_VBLANK_PIPE        0x0d
#define DRM_I915_GET_VBLANK_PIPE        0x0e
#define DRM_I915_VBLANK_SWAP    0x0f
#define DRM_I915_HWS_ADDR       0x11
#define DRM_I915_GEM_INIT       0x13
#define DRM_I915_GEM_EXECBUFFER 0x14
#define DRM_I915_GEM_PIN        0x15
#define DRM_I915_GEM_UNPIN      0x16
#define DRM_I915_GEM_BUSY       0x17
#define DRM_I915_GEM_THROTTLE   0x18
#define DRM_I915_GEM_ENTERVT    0x19
#define DRM_I915_GEM_LEAVEVT    0x1a
#define DRM_I915_GEM_CREATE     0x1b
#define DRM_I915_GEM_PREAD      0x1c
#define DRM_I915_GEM_PWRITE     0x1d
#define DRM_I915_GEM_MMAP       0x1e
#define DRM_I915_GEM_SET_DOMAIN 0x1f
#define DRM_I915_GEM_SW_FINISH  0x20
#define DRM_I915_GEM_SET_TILING 0x21
#define DRM_I915_GEM_GET_TILING 0x22
#define DRM_I915_GEM_GET_APERTURE 0x23
#define DRM_I915_GEM_MMAP_GTT   0x24
#define DRM_I915_GET_PIPE_FROM_CRTC_ID  0x25
#define DRM_I915_GEM_MADVISE    0x26
#define DRM_I915_OVERLAY_PUT_IMAGE      0x27
#define DRM_I915_OVERLAY_ATTRS  0x28
#define DRM_I915_GEM_EXECBUFFER2        0x29
#define DRM_I915_GEM_EXECBUFFER2_WR     DRM_I915_GEM_EXECBUFFER2
#define DRM_I915_GET_SPRITE_COLORKEY    0x2a
#define DRM_I915_SET_SPRITE_COLORKEY    0x2b
#define DRM_I915_GEM_WAIT       0x2c
#define DRM_I915_GEM_CONTEXT_CREATE     0x2d
#define DRM_I915_GEM_CONTEXT_DESTROY    0x2e
#define DRM_I915_GEM_SET_CACHING        0x2f
#define DRM_I915_GEM_GET_CACHING        0x30
#define DRM_I915_REG_READ               0x31
#define DRM_I915_GET_RESET_STATS        0x32
#define DRM_I915_GEM_USERPTR            0x33
#define DRM_I915_GEM_CONTEXT_GETPARAM   0x34
#define DRM_I915_GEM_CONTEXT_SETPARAM   0x35
#define DRM_I915_PERF_OPEN              0x36
#define DRM_I915_PERF_ADD_CONFIG        0x37
#define DRM_I915_PERF_REMOVE_CONFIG     0x38
#define DRM_I915_QUERY                  0x39
#define DRM_I915_GEM_VM_CREATE          0x3a
#define DRM_I915_GEM_VM_DESTROY         0x3b
#define DRM_I915_GEM_CREATE_EXT         0x3c
/* Must be kept compact -- no holes */

#define DRM_IOCTL_I915_INIT             DRM_IOW( DRM_COMMAND_BASE + DRM_I915_INIT, drm_i915_init_t)
#define DRM_IOCTL_I915_FLUSH            DRM_IO ( DRM_COMMAND_BASE + DRM_I915_FLUSH)
#define DRM_IOCTL_I915_FLIP             DRM_IO ( DRM_COMMAND_BASE + DRM_I915_FLIP)
#define DRM_IOCTL_I915_BATCHBUFFER      DRM_IOW( DRM_COMMAND_BASE + DRM_I915_BATCHBUFFER, drm_i915_batchbuffer_t)
#define DRM_IOCTL_I915_IRQ_EMIT         DRM_IOWR(DRM_COMMAND_BASE + DRM_I915_IRQ_EMIT, drm_i915_irq_emit_t)
#define DRM_IOCTL_I915_IRQ_WAIT         DRM_IOW( DRM_COMMAND_BASE + DRM_I915_IRQ_WAIT, drm_i915_irq_wait_t)
#define DRM_IOCTL_I915_GETPARAM         DRM_IOWR(DRM_COMMAND_BASE + DRM_I915_GETPARAM, drm_i915_getparam_t)
#define DRM_IOCTL_I915_SETPARAM         DRM_IOW( DRM_COMMAND_BASE + DRM_I915_SETPARAM, drm_i915_setparam_t)
#define DRM_IOCTL_I915_ALLOC            DRM_IOWR(DRM_COMMAND_BASE + DRM_I915_ALLOC, drm_i915_mem_alloc_t)
#define DRM_IOCTL_I915_FREE             DRM_IOW( DRM_COMMAND_BASE + DRM_I915_FREE, drm_i915_mem_free_t)
#define DRM_IOCTL_I915_INIT_HEAP        DRM_IOW( DRM_COMMAND_BASE + DRM_I915_INIT_HEAP, drm_i915_mem_init_heap_t)
#define DRM_IOCTL_I915_CMDBUFFER        DRM_IOW( DRM_COMMAND_BASE + DRM_I915_CMDBUFFER, drm_i915_cmdbuffer_t)
#define DRM_IOCTL_I915_DESTROY_HEAP     DRM_IOW( DRM_COMMAND_BASE + DRM_I915_DESTROY_HEAP, drm_i915_mem_destroy_heap_t)
#define DRM_IOCTL_I915_SET_VBLANK_PIPE  DRM_IOW( DRM_COMMAND_BASE + DRM_I915_SET_VBLANK_PIPE, drm_i915_vblank_pipe_t)
#define DRM_IOCTL_I915_GET_VBLANK_PIPE  DRM_IOR( DRM_COMMAND_BASE + DRM_I915_GET_VBLANK_PIPE, drm_i915_vblank_pipe_t)
#define DRM_IOCTL_I915_VBLANK_SWAP      DRM_IOWR(DRM_COMMAND_BASE + DRM_I915_VBLANK_SWAP, drm_i915_vblank_swap_t)
#define DRM_IOCTL_I915_HWS_ADDR         DRM_IOW(DRM_COMMAND_BASE + DRM_I915_HWS_ADDR, struct drm_i915_gem_init)
#define DRM_IOCTL_I915_GEM_INIT         DRM_IOW(DRM_COMMAND_BASE + DRM_I915_GEM_INIT, struct drm_i915_gem_init)
#define DRM_IOCTL_I915_GEM_EXECBUFFER   DRM_IOW(DRM_COMMAND_BASE + DRM_I915_GEM_EXECBUFFER, struct drm_i915_gem_execbuffer)
#define DRM_IOCTL_I915_GEM_EXECBUFFER2  DRM_IOW(DRM_COMMAND_BASE + DRM_I915_GEM_EXECBUFFER2, struct drm_i915_gem_execbuffer2)
#define DRM_IOCTL_I915_GEM_EXECBUFFER2_WR       DRM_IOWR(DRM_COMMAND_BASE + DRM_I915_GEM_EXECBUFFER2_WR, struct drm_i915_gem_execbuffer2)
#define DRM_IOCTL_I915_GEM_PIN          DRM_IOWR(DRM_COMMAND_BASE + DRM_I915_GEM_PIN, struct drm_i915_gem_pin)
#define DRM_IOCTL_I915_GEM_UNPIN        DRM_IOW(DRM_COMMAND_BASE + DRM_I915_GEM_UNPIN, struct drm_i915_gem_unpin)
#define DRM_IOCTL_I915_GEM_BUSY         DRM_IOWR(DRM_COMMAND_BASE + DRM_I915_GEM_BUSY, struct drm_i915_gem_busy)
#define DRM_IOCTL_I915_GEM_SET_CACHING          DRM_IOW(DRM_COMMAND_BASE + DRM_I915_GEM_SET_CACHING, struct drm_i915_gem_caching)
#define DRM_IOCTL_I915_GEM_GET_CACHING          DRM_IOWR(DRM_COMMAND_BASE + DRM_I915_GEM_GET_CACHING, struct drm_i915_gem_caching)
#define DRM_IOCTL_I915_GEM_THROTTLE     DRM_IO ( DRM_COMMAND_BASE + DRM_I915_GEM_THROTTLE)
#define DRM_IOCTL_I915_GEM_ENTERVT      DRM_IO(DRM_COMMAND_BASE + DRM_I915_GEM_ENTERVT)
#define DRM_IOCTL_I915_GEM_LEAVEVT      DRM_IO(DRM_COMMAND_BASE + DRM_I915_GEM_LEAVEVT)
#define DRM_IOCTL_I915_GEM_CREATE       DRM_IOWR(DRM_COMMAND_BASE + DRM_I915_GEM_CREATE, struct drm_i915_gem_create)
#define DRM_IOCTL_I915_GEM_CREATE_EXT   DRM_IOWR(DRM_COMMAND_BASE + DRM_I915_GEM_CREATE_EXT, struct drm_i915_gem_create_ext)
#define DRM_IOCTL_I915_GEM_PREAD        DRM_IOW (DRM_COMMAND_BASE + DRM_I915_GEM_PREAD, struct drm_i915_gem_pread)
#define DRM_IOCTL_I915_GEM_PWRITE       DRM_IOW (DRM_COMMAND_BASE + DRM_I915_GEM_PWRITE, struct drm_i915_gem_pwrite)
#define DRM_IOCTL_I915_GEM_MMAP         DRM_IOWR(DRM_COMMAND_BASE + DRM_I915_GEM_MMAP, struct drm_i915_gem_mmap)
#define DRM_IOCTL_I915_GEM_MMAP_GTT     DRM_IOWR(DRM_COMMAND_BASE + DRM_I915_GEM_MMAP_GTT, struct drm_i915_gem_mmap_gtt)
#define DRM_IOCTL_I915_GEM_MMAP_OFFSET  DRM_IOWR(DRM_COMMAND_BASE + DRM_I915_GEM_MMAP_GTT, struct drm_i915_gem_mmap_offset)
#define DRM_IOCTL_I915_GEM_SET_DOMAIN   DRM_IOW (DRM_COMMAND_BASE + DRM_I915_GEM_SET_DOMAIN, struct drm_i915_gem_set_domain)
#define DRM_IOCTL_I915_GEM_SW_FINISH    DRM_IOW (DRM_COMMAND_BASE + DRM_I915_GEM_SW_FINISH, struct drm_i915_gem_sw_finish)
#define DRM_IOCTL_I915_GEM_SET_TILING   DRM_IOWR (DRM_COMMAND_BASE + DRM_I915_GEM_SET_TILING, struct drm_i915_gem_set_tiling)
#define DRM_IOCTL_I915_GEM_GET_TILING   DRM_IOWR (DRM_COMMAND_BASE + DRM_I915_GEM_GET_TILING, struct drm_i915_gem_get_tiling)
#define DRM_IOCTL_I915_GEM_GET_APERTURE DRM_IOR  (DRM_COMMAND_BASE + DRM_I915_GEM_GET_APERTURE, struct drm_i915_gem_get_aperture)
#define DRM_IOCTL_I915_GET_PIPE_FROM_CRTC_ID DRM_IOWR(DRM_COMMAND_BASE + DRM_I915_GET_PIPE_FROM_CRTC_ID, struct drm_i915_get_pipe_from_crtc_id)
#define DRM_IOCTL_I915_GEM_MADVISE      DRM_IOWR(DRM_COMMAND_BASE + DRM_I915_GEM_MADVISE, struct drm_i915_gem_madvise)
#define DRM_IOCTL_I915_OVERLAY_PUT_IMAGE        DRM_IOW(DRM_COMMAND_BASE + DRM_I915_OVERLAY_PUT_IMAGE, struct drm_intel_overlay_put_image)
#define DRM_IOCTL_I915_OVERLAY_ATTRS    DRM_IOWR(DRM_COMMAND_BASE + DRM_I915_OVERLAY_ATTRS, struct drm_intel_overlay_attrs)
#define DRM_IOCTL_I915_SET_SPRITE_COLORKEY DRM_IOWR(DRM_COMMAND_BASE + DRM_I915_SET_SPRITE_COLORKEY, struct drm_intel_sprite_colorkey)
#define DRM_IOCTL_I915_GET_SPRITE_COLORKEY DRM_IOWR(DRM_COMMAND_BASE + DRM_I915_GET_SPRITE_COLORKEY, struct drm_intel_sprite_colorkey)
#define DRM_IOCTL_I915_GEM_WAIT         DRM_IOWR(DRM_COMMAND_BASE + DRM_I915_GEM_WAIT, struct drm_i915_gem_wait)
#define DRM_IOCTL_I915_GEM_CONTEXT_CREATE       DRM_IOWR (DRM_COMMAND_BASE + DRM_I915_GEM_CONTEXT_CREATE, struct drm_i915_gem_context_create)
#define DRM_IOCTL_I915_GEM_CONTEXT_CREATE_EXT   DRM_IOWR (DRM_COMMAND_BASE + DRM_I915_GEM_CONTEXT_CREATE, struct drm_i915_gem_context_create_ext)
#define DRM_IOCTL_I915_GEM_CONTEXT_DESTROY      DRM_IOW (DRM_COMMAND_BASE + DRM_I915_GEM_CONTEXT_DESTROY, struct drm_i915_gem_context_destroy)
#define DRM_IOCTL_I915_REG_READ                 DRM_IOWR (DRM_COMMAND_BASE + DRM_I915_REG_READ, struct drm_i915_reg_read)
#define DRM_IOCTL_I915_GET_RESET_STATS          DRM_IOWR (DRM_COMMAND_BASE + DRM_I915_GET_RESET_STATS, struct drm_i915_reset_stats)
#define DRM_IOCTL_I915_GEM_USERPTR                      DRM_IOWR (DRM_COMMAND_BASE + DRM_I915_GEM_USERPTR, struct drm_i915_gem_userptr)
#define DRM_IOCTL_I915_GEM_CONTEXT_GETPARAM     DRM_IOWR (DRM_COMMAND_BASE + DRM_I915_GEM_CONTEXT_GETPARAM, struct drm_i915_gem_context_param)
#define DRM_IOCTL_I915_GEM_CONTEXT_SETPARAM     DRM_IOWR (DRM_COMMAND_BASE + DRM_I915_GEM_CONTEXT_SETPARAM, struct drm_i915_gem_context_param)
#define DRM_IOCTL_I915_PERF_OPEN        DRM_IOW(DRM_COMMAND_BASE + DRM_I915_PERF_OPEN, struct drm_i915_perf_open_param)
#define DRM_IOCTL_I915_PERF_ADD_CONFIG  DRM_IOW(DRM_COMMAND_BASE + DRM_I915_PERF_ADD_CONFIG, struct drm_i915_perf_oa_config)
#define DRM_IOCTL_I915_PERF_REMOVE_CONFIG       DRM_IOW(DRM_COMMAND_BASE + DRM_I915_PERF_REMOVE_CONFIG, __u64)
#define DRM_IOCTL_I915_QUERY                    DRM_IOWR(DRM_COMMAND_BASE + DRM_I915_QUERY, struct drm_i915_query)
#define DRM_IOCTL_I915_GEM_VM_CREATE    DRM_IOWR(DRM_COMMAND_BASE + DRM_I915_GEM_VM_CREATE, struct drm_i915_gem_vm_control)
#define DRM_IOCTL_I915_GEM_VM_DESTROY   DRM_IOW (DRM_COMMAND_BASE + DRM_I915_GEM_VM_DESTROY, struct drm_i915_gem_vm_control)

/* Allow drivers to submit batchbuffers directly to hardware, relying
 * on the security mechanisms provided by hardware.
 */
typedef struct drm_i915_batchbuffer {
        int start;              /* agp offset */
        int used;               /* nr bytes in use */
        int DR1;                /* hw flags for GFX_OP_DRAWRECT_INFO */
        int DR4;                /* window origin for GFX_OP_DRAWRECT_INFO */
        int num_cliprects;      /* mulitpass with multiple cliprects? */
        struct drm_clip_rect __user *cliprects; /* pointer to userspace cliprects */
} drm_i915_batchbuffer_t;

/* As above, but pass a pointer to userspace buffer which can be
 * validated by the kernel prior to sending to hardware.
 */
typedef struct _drm_i915_cmdbuffer {
        char __user *buf;       /* pointer to userspace command buffer */
        int sz;                 /* nr bytes in buf */
        int DR1;                /* hw flags for GFX_OP_DRAWRECT_INFO */
        int DR4;                /* window origin for GFX_OP_DRAWRECT_INFO */
        int num_cliprects;      /* mulitpass with multiple cliprects? */
        struct drm_clip_rect __user *cliprects; /* pointer to userspace cliprects */
} drm_i915_cmdbuffer_t;

/* Userspace can request & wait on irq's:
 */
typedef struct drm_i915_irq_emit {
        int __user *irq_seq;
} drm_i915_irq_emit_t;

typedef struct drm_i915_irq_wait {
        int irq_seq;
} drm_i915_irq_wait_t;

/*
 * Different modes of per-process Graphics Translation Table,
 * see I915_PARAM_HAS_ALIASING_PPGTT
 */
#define I915_GEM_PPGTT_NONE     0
#define I915_GEM_PPGTT_ALIASING 1
#define I915_GEM_PPGTT_FULL     2

/* Ioctl to query kernel params:
 */
#define I915_PARAM_IRQ_ACTIVE            1
#define I915_PARAM_ALLOW_BATCHBUFFER     2
#define I915_PARAM_LAST_DISPATCH         3
#define I915_PARAM_CHIPSET_ID            4
#define I915_PARAM_HAS_GEM               5
#define I915_PARAM_NUM_FENCES_AVAIL      6
#define I915_PARAM_HAS_OVERLAY           7
#define I915_PARAM_HAS_PAGEFLIPPING      8
#define I915_PARAM_HAS_EXECBUF2          9
#define I915_PARAM_HAS_BSD               10
#define I915_PARAM_HAS_BLT               11
#define I915_PARAM_HAS_RELAXED_FENCING   12
#define I915_PARAM_HAS_COHERENT_RINGS    13
#define I915_PARAM_HAS_EXEC_CONSTANTS    14
#define I915_PARAM_HAS_RELAXED_DELTA     15
#define I915_PARAM_HAS_GEN7_SOL_RESET    16
#define I915_PARAM_HAS_LLC               17
#define I915_PARAM_HAS_ALIASING_PPGTT    18
#define I915_PARAM_HAS_WAIT_TIMEOUT      19
#define I915_PARAM_HAS_SEMAPHORES        20
#define I915_PARAM_HAS_PRIME_VMAP_FLUSH  21
#define I915_PARAM_HAS_VEBOX             22
#define I915_PARAM_HAS_SECURE_BATCHES    23
#define I915_PARAM_HAS_PINNED_BATCHES    24
#define I915_PARAM_HAS_EXEC_NO_RELOC     25
#define I915_PARAM_HAS_EXEC_HANDLE_LUT   26
#define I915_PARAM_HAS_WT                27
#define I915_PARAM_CMD_PARSER_VERSION    28
#define I915_PARAM_HAS_COHERENT_PHYS_GTT 29
#define I915_PARAM_MMAP_VERSION          30
#define I915_PARAM_HAS_BSD2              31
#define I915_PARAM_REVISION              32
#define I915_PARAM_SUBSLICE_TOTAL        33
#define I915_PARAM_EU_TOTAL              34
#define I915_PARAM_HAS_GPU_RESET         35
#define I915_PARAM_HAS_RESOURCE_STREAMER 36
#define I915_PARAM_HAS_EXEC_SOFTPIN      37
#define I915_PARAM_HAS_POOLED_EU         38
#define I915_PARAM_MIN_EU_IN_POOL        39
#define I915_PARAM_MMAP_GTT_VERSION      40

/*
 * Query whether DRM_I915_GEM_EXECBUFFER2 supports user defined execution
 * priorities and the driver will attempt to execute batches in priority order.
 * The param returns a capability bitmask, nonzero implies that the scheduler
 * is enabled, with different features present according to the mask.
 *
 * The initial priority for each batch is supplied by the context and is
 * controlled via I915_CONTEXT_PARAM_PRIORITY.
 */
#define I915_PARAM_HAS_SCHEDULER         41
#define   I915_SCHEDULER_CAP_ENABLED    (1ul << 0)
#define   I915_SCHEDULER_CAP_PRIORITY   (1ul << 1)
#define   I915_SCHEDULER_CAP_PREEMPTION (1ul << 2)
#define   I915_SCHEDULER_CAP_SEMAPHORES (1ul << 3)
#define   I915_SCHEDULER_CAP_ENGINE_BUSY_STATS  (1ul << 4)

#define I915_PARAM_HUC_STATUS            42

/* Query whether DRM_I915_GEM_EXECBUFFER2 supports the ability to opt-out of
 * synchronisation with implicit fencing on individual objects.
 * See EXEC_OBJECT_ASYNC.
 */
#define I915_PARAM_HAS_EXEC_ASYNC        43

/* Query whether DRM_I915_GEM_EXECBUFFER2 supports explicit fence support -
 * both being able to pass in a sync_file fd to wait upon before executing,
 * and being able to return a new sync_file fd that is signaled when the
 * current request is complete. See I915_EXEC_FENCE_IN and I915_EXEC_FENCE_OUT.
 */
#define I915_PARAM_HAS_EXEC_FENCE        44

/* Query whether DRM_I915_GEM_EXECBUFFER2 supports the ability to capture
 * user specified bufffers for post-mortem debugging of GPU hangs. See
 * EXEC_OBJECT_CAPTURE.
 */
#define I915_PARAM_HAS_EXEC_CAPTURE      45

#define I915_PARAM_SLICE_MASK            46

/* Assuming it's uniform for each slice, this queries the mask of subslices
 * per-slice for this system.
 */
#define I915_PARAM_SUBSLICE_MASK         47

/*
 * Query whether DRM_I915_GEM_EXECBUFFER2 supports supplying the batch buffer
 * as the first execobject as opposed to the last. See I915_EXEC_BATCH_FIRST.
 */
#define I915_PARAM_HAS_EXEC_BATCH_FIRST  48

/* Query whether DRM_I915_GEM_EXECBUFFER2 supports supplying an array of
 * drm_i915_gem_exec_fence structures.  See I915_EXEC_FENCE_ARRAY.
 */
#define I915_PARAM_HAS_EXEC_FENCE_ARRAY  49

/*
 * Query whether every context (both per-file default and user created) is
 * isolated (insofar as HW supports). If this parameter is not true, then
 * freshly created contexts may inherit values from an existing context,
 * rather than default HW values. If true, it also ensures (insofar as HW
 * supports) that all state set by this context will not leak to any other
 * context.
 *
 * As not every engine across every gen support contexts, the returned
 * value reports the support of context isolation for individual engines by
 * returning a bitmask of each engine class set to true if that class supports
 * isolation.
 */
#define I915_PARAM_HAS_CONTEXT_ISOLATION 50

/* Frequency of the command streamer timestamps given by the *_TIMESTAMP
 * registers. This used to be fixed per platform but from CNL onwards, this
 * might vary depending on the parts.
 */
#define I915_PARAM_CS_TIMESTAMP_FREQUENCY 51

/*
 * Once upon a time we supposed that writes through the GGTT would be
 * immediately in physical memory (once flushed out of the CPU path). However,
 * on a few different processors and chipsets, this is not necessarily the case
 * as the writes appear to be buffered internally. Thus a read of the backing
 * storage (physical memory) via a different path (with different physical tags
 * to the indirect write via the GGTT) will see stale values from before
 * the GGTT write. Inside the kernel, we can for the most part keep track of
 * the different read/write domains in use (e.g. set-domain), but the assumption
 * of coherency is baked into the ABI, hence reporting its true state in this
 * parameter.
 *
 * Reports true when writes via mmap_gtt are immediately visible following an
 * lfence to flush the WCB.
 *
 * Reports false when writes via mmap_gtt are indeterminately delayed in an in
 * internal buffer and are _not_ immediately visible to third parties accessing
 * directly via mmap_cpu/mmap_wc. Use of mmap_gtt as part of an IPC
 * communications channel when reporting false is strongly disadvised.
 */
#define I915_PARAM_MMAP_GTT_COHERENT    52

/*
 * Query whether DRM_I915_GEM_EXECBUFFER2 supports coordination of parallel
 * execution through use of explicit fence support.
 * See I915_EXEC_FENCE_OUT and I915_EXEC_FENCE_SUBMIT.
 */
#define I915_PARAM_HAS_EXEC_SUBMIT_FENCE 53

/*
 * Revision of the i915-perf uAPI. The value returned helps determine what
 * i915-perf features are available. See drm_i915_perf_property_id.
 */
#define I915_PARAM_PERF_REVISION        54

/* Query whether DRM_I915_GEM_EXECBUFFER2 supports supplying an array of
 * timeline syncobj through drm_i915_gem_execbuffer_ext_timeline_fences. See
 * I915_EXEC_USE_EXTENSIONS.
 */
#define I915_PARAM_HAS_EXEC_TIMELINE_FENCES 55

/* Must be kept compact -- no holes and well documented */

typedef struct drm_i915_getparam {
        __s32 param;
        /*
         * WARNING: Using pointers instead of fixed-size u64 means we need to write
         * compat32 code. Don't repeat this mistake.
         */
        int __user *value;
} drm_i915_getparam_t;

/* Ioctl to set kernel params:
 */
#define I915_SETPARAM_USE_MI_BATCHBUFFER_START            1
#define I915_SETPARAM_TEX_LRU_LOG_GRANULARITY             2
#define I915_SETPARAM_ALLOW_BATCHBUFFER                   3
#define I915_SETPARAM_NUM_USED_FENCES                     4
/* Must be kept compact -- no holes */

typedef struct drm_i915_setparam {
        int param;
        int value;
} drm_i915_setparam_t;

/* A memory manager for regions of shared memory:
 */
#define I915_MEM_REGION_AGP 1

typedef struct drm_i915_mem_alloc {
        int region;
        int alignment;
        int size;
        int __user *region_offset;      /* offset from start of fb or agp */
} drm_i915_mem_alloc_t;

typedef struct drm_i915_mem_free {
        int region;
        int region_offset;
} drm_i915_mem_free_t;

typedef struct drm_i915_mem_init_heap {
        int region;
        int size;
        int start;
} drm_i915_mem_init_heap_t;

/* Allow memory manager to be torn down and re-initialized (eg on
 * rotate):
 */
typedef struct drm_i915_mem_destroy_heap {
        int region;
} drm_i915_mem_destroy_heap_t;

/* Allow X server to configure which pipes to monitor for vblank signals
 */
#define DRM_I915_VBLANK_PIPE_A  1
#define DRM_I915_VBLANK_PIPE_B  2

typedef struct drm_i915_vblank_pipe {
        int pipe;
} drm_i915_vblank_pipe_t;

/* Schedule buffer swap at given vertical blank:
 */
typedef struct drm_i915_vblank_swap {
        drm_drawable_t drawable;
        enum drm_vblank_seq_type seqtype;
        unsigned int sequence;
} drm_i915_vblank_swap_t;

typedef struct drm_i915_hws_addr {
        __u64 addr;
} drm_i915_hws_addr_t;

struct drm_i915_gem_init {
        /**
         * Beginning offset in the GTT to be managed by the DRM memory
         * manager.
         */
        __u64 gtt_start;
        /**
         * Ending offset in the GTT to be managed by the DRM memory
         * manager.
         */
        __u64 gtt_end;
};

struct drm_i915_gem_create {
        /**
         * Requested size for the object.
         *
         * The (page-aligned) allocated size for the object will be returned.
         */
        __u64 size;
        /**
         * Returned handle for the object.
         *
         * Object handles are nonzero.
         */
        __u32 handle;
        __u32 pad;
};

struct drm_i915_gem_pread {
        /** Handle for the object being read. */
        __u32 handle;
        __u32 pad;
        /** Offset into the object to read from */
        __u64 offset;
        /** Length of data to read */
        __u64 size;
        /**
         * Pointer to write the data into.
         *
         * This is a fixed-size type for 32/64 compatibility.
         */
        __u64 data_ptr;
};

struct drm_i915_gem_pwrite {
        /** Handle for the object being written to. */
        __u32 handle;
        __u32 pad;
        /** Offset into the object to write to */
        __u64 offset;
        /** Length of data to write */
        __u64 size;
        /**
         * Pointer to read the data from.
         *
         * This is a fixed-size type for 32/64 compatibility.
         */
        __u64 data_ptr;
};

struct drm_i915_gem_mmap {
        /** Handle for the object being mapped. */
        __u32 handle;
        __u32 pad;
        /** Offset in the object to map. */
        __u64 offset;
        /**
         * Length of data to map.
         *
         * The value will be page-aligned.
         */
        __u64 size;
        /**
         * Returned pointer the data was mapped at.
         *
         * This is a fixed-size type for 32/64 compatibility.
         */
        __u64 addr_ptr;

        /**
         * Flags for extended behaviour.
         *
         * Added in version 2.
         */
        __u64 flags;
#define I915_MMAP_WC 0x1
};

struct drm_i915_gem_mmap_gtt {
        /** Handle for the object being mapped. */
        __u32 handle;
        __u32 pad;
        /**
         * Fake offset to use for subsequent mmap call
         *
         * This is a fixed-size type for 32/64 compatibility.
         */
        __u64 offset;
};

struct drm_i915_gem_mmap_offset {
        /** Handle for the object being mapped. */
        __u32 handle;
        __u32 pad;
        /**
         * Fake offset to use for subsequent mmap call
         *
         * This is a fixed-size type for 32/64 compatibility.
         */
        __u64 offset;

        /**
         * Flags for extended behaviour.
         *
         * It is mandatory that one of the MMAP_OFFSET types
         * (GTT, WC, WB, UC, etc) should be included.
         */
        __u64 flags;
#define I915_MMAP_OFFSET_GTT 0
#define I915_MMAP_OFFSET_WC  1
#define I915_MMAP_OFFSET_WB  2
#define I915_MMAP_OFFSET_UC  3

        /*
         * Zero-terminated chain of extensions.
         *
         * No current extensions defined; mbz.
         */
        __u64 extensions;
};

/**
 * struct drm_i915_gem_set_domain - Adjust the objects write or read domain, in
 * preparation for accessing the pages via some CPU domain.
 *
 * Specifying a new write or read domain will flush the object out of the
 * previous domain(if required), before then updating the objects domain
 * tracking with the new domain.
 *
 * Note this might involve waiting for the object first if it is still active on
 * the GPU.
 *
 * Supported values for @read_domains and @write_domain:
 *
 *      - I915_GEM_DOMAIN_WC: Uncached write-combined domain
 *      - I915_GEM_DOMAIN_CPU: CPU cache domain
 *      - I915_GEM_DOMAIN_GTT: Mappable aperture domain
 *
 * All other domains are rejected.
 */
struct drm_i915_gem_set_domain {
        /** @handle: Handle for the object. */
        __u32 handle;

        /** @read_domains: New read domains. */
        __u32 read_domains;

        /**
         * @write_domain: New write domain.
         *
         * Note that having something in the write domain implies it's in the
         * read domain, and only that read domain.
         */
        __u32 write_domain;
};

struct drm_i915_gem_sw_finish {
        /** Handle for the object */
        __u32 handle;
};

struct drm_i915_gem_relocation_entry {
        /**
         * Handle of the buffer being pointed to by this relocation entry.
         *
         * It's appealing to make this be an index into the mm_validate_entry
         * list to refer to the buffer, but this allows the driver to create
         * a relocation list for state buffers and not re-write it per
         * exec using the buffer.
         */
        __u32 target_handle;

        /**
         * Value to be added to the offset of the target buffer to make up
         * the relocation entry.
         */
        __u32 delta;

        /** Offset in the buffer the relocation entry will be written into */
        __u64 offset;

        /**
         * Offset value of the target buffer that the relocation entry was last
         * written as.
         *
         * If the buffer has the same offset as last time, we can skip syncing
         * and writing the relocation.  This value is written back out by
         * the execbuffer ioctl when the relocation is written.
         */
        __u64 presumed_offset;

        /**
         * Target memory domains read by this operation.
         */
        __u32 read_domains;

        /**
         * Target memory domains written by this operation.
         *
         * Note that only one domain may be written by the whole
         * execbuffer operation, so that where there are conflicts,
         * the application will get -EINVAL back.
         */
        __u32 write_domain;
};

/** @{
 * Intel memory domains
 *
 * Most of these just align with the various caches in
 * the system and are used to flush and invalidate as
 * objects end up cached in different domains.
 */
/** CPU cache */
#define I915_GEM_DOMAIN_CPU             0x00000001
/** Render cache, used by 2D and 3D drawing */
#define I915_GEM_DOMAIN_RENDER          0x00000002
/** Sampler cache, used by texture engine */
#define I915_GEM_DOMAIN_SAMPLER         0x00000004
/** Command queue, used to load batch buffers */
#define I915_GEM_DOMAIN_COMMAND         0x00000008
/** Instruction cache, used by shader programs */
#define I915_GEM_DOMAIN_INSTRUCTION     0x00000010
/** Vertex address cache */
#define I915_GEM_DOMAIN_VERTEX          0x00000020
/** GTT domain - aperture and scanout */
#define I915_GEM_DOMAIN_GTT             0x00000040
/** WC domain - uncached access */
#define I915_GEM_DOMAIN_WC              0x00000080
/** @} */

struct drm_i915_gem_exec_object {
        /**
         * User's handle for a buffer to be bound into the GTT for this
         * operation.
         */
        __u32 handle;

        /** Number of relocations to be performed on this buffer */
        __u32 relocation_count;
        /**
         * Pointer to array of struct drm_i915_gem_relocation_entry containing
         * the relocations to be performed in this buffer.
         */
        __u64 relocs_ptr;

        /** Required alignment in graphics aperture */
        __u64 alignment;

        /**
         * Returned value of the updated offset of the object, for future
         * presumed_offset writes.
         */
        __u64 offset;
};

/* DRM_IOCTL_I915_GEM_EXECBUFFER was removed in Linux 5.13 */
struct drm_i915_gem_execbuffer {
        /**
         * List of buffers to be validated with their relocations to be
         * performend on them.
         *
         * This is a pointer to an array of struct drm_i915_gem_validate_entry.
         *
         * These buffers must be listed in an order such that all relocations
         * a buffer is performing refer to buffers that have already appeared
         * in the validate list.
         */
        __u64 buffers_ptr;
        __u32 buffer_count;

        /** Offset in the batchbuffer to start execution from. */
        __u32 batch_start_offset;
        /** Bytes used in batchbuffer from batch_start_offset */
        __u32 batch_len;
        __u32 DR1;
        __u32 DR4;
        __u32 num_cliprects;
        /** This is a struct drm_clip_rect *cliprects */
        __u64 cliprects_ptr;
};

struct drm_i915_gem_exec_object2 {
        /**
         * User's handle for a buffer to be bound into the GTT for this
         * operation.
         */
        __u32 handle;

        /** Number of relocations to be performed on this buffer */
        __u32 relocation_count;
        /**
         * Pointer to array of struct drm_i915_gem_relocation_entry containing
         * the relocations to be performed in this buffer.
         */
        __u64 relocs_ptr;

        /** Required alignment in graphics aperture */
        __u64 alignment;

        /**
         * When the EXEC_OBJECT_PINNED flag is specified this is populated by
         * the user with the GTT offset at which this object will be pinned.
         * When the I915_EXEC_NO_RELOC flag is specified this must contain the
         * presumed_offset of the object.
         * During execbuffer2 the kernel populates it with the value of the
         * current GTT offset of the object, for future presumed_offset writes.
         */
        __u64 offset;

#define EXEC_OBJECT_NEEDS_FENCE          (1<<0)
#define EXEC_OBJECT_NEEDS_GTT            (1<<1)
#define EXEC_OBJECT_WRITE                (1<<2)
#define EXEC_OBJECT_SUPPORTS_48B_ADDRESS (1<<3)
#define EXEC_OBJECT_PINNED               (1<<4)
#define EXEC_OBJECT_PAD_TO_SIZE          (1<<5)
/* The kernel implicitly tracks GPU activity on all GEM objects, and
 * synchronises operations with outstanding rendering. This includes
 * rendering on other devices if exported via dma-buf. However, sometimes
 * this tracking is too coarse and the user knows better. For example,
 * if the object is split into non-overlapping ranges shared between different
 * clients or engines (i.e. suballocating objects), the implicit tracking
 * by kernel assumes that each operation affects the whole object rather
 * than an individual range, causing needless synchronisation between clients.
 * The kernel will also forgo any CPU cache flushes prior to rendering from
 * the object as the client is expected to be also handling such domain
 * tracking.
 *
 * The kernel maintains the implicit tracking in order to manage resources
 * used by the GPU - this flag only disables the synchronisation prior to
 * rendering with this object in this execbuf.
 *
 * Opting out of implicit synhronisation requires the user to do its own
 * explicit tracking to avoid rendering corruption. See, for example,
 * I915_PARAM_HAS_EXEC_FENCE to order execbufs and execute them asynchronously.
 */
#define EXEC_OBJECT_ASYNC               (1<<6)
/* Request that the contents of this execobject be copied into the error
 * state upon a GPU hang involving this batch for post-mortem debugging.
 * These buffers are recorded in no particular order as "user" in
 * /sys/class/drm/cardN/error. Query I915_PARAM_HAS_EXEC_CAPTURE to see
 * if the kernel supports this flag.
 */
#define EXEC_OBJECT_CAPTURE             (1<<7)
/* All remaining bits are MBZ and RESERVED FOR FUTURE USE */
#define __EXEC_OBJECT_UNKNOWN_FLAGS -(EXEC_OBJECT_CAPTURE<<1)
        __u64 flags;

        union {
                __u64 rsvd1;
                __u64 pad_to_size;
        };
        __u64 rsvd2;
};

struct drm_i915_gem_exec_fence {
        /**
         * User's handle for a drm_syncobj to wait on or signal.
         */
        __u32 handle;

#define I915_EXEC_FENCE_WAIT            (1<<0)
#define I915_EXEC_FENCE_SIGNAL          (1<<1)
#define __I915_EXEC_FENCE_UNKNOWN_FLAGS (-(I915_EXEC_FENCE_SIGNAL << 1))
        __u32 flags;
};

/*
 * See drm_i915_gem_execbuffer_ext_timeline_fences.
 */
#define DRM_I915_GEM_EXECBUFFER_EXT_TIMELINE_FENCES 0

/*
 * This structure describes an array of drm_syncobj and associated points for
 * timeline variants of drm_syncobj. It is invalid to append this structure to
 * the execbuf if I915_EXEC_FENCE_ARRAY is set.
 */
struct drm_i915_gem_execbuffer_ext_timeline_fences {
        struct i915_user_extension base;

        /**
         * Number of element in the handles_ptr & value_ptr arrays.
         */
        __u64 fence_count;

        /**
         * Pointer to an array of struct drm_i915_gem_exec_fence of length
         * fence_count.
         */
        __u64 handles_ptr;

        /**
         * Pointer to an array of u64 values of length fence_count. Values
         * must be 0 for a binary drm_syncobj. A Value of 0 for a timeline
         * drm_syncobj is invalid as it turns a drm_syncobj into a binary one.
         */
        __u64 values_ptr;
};

struct drm_i915_gem_execbuffer2 {
        /**
         * List of gem_exec_object2 structs
         */
        __u64 buffers_ptr;
        __u32 buffer_count;

        /** Offset in the batchbuffer to start execution from. */
        __u32 batch_start_offset;
        /** Bytes used in batchbuffer from batch_start_offset */
        __u32 batch_len;
        __u32 DR1;
        __u32 DR4;
        __u32 num_cliprects;
        /**
         * This is a struct drm_clip_rect *cliprects if I915_EXEC_FENCE_ARRAY
         * & I915_EXEC_USE_EXTENSIONS are not set.
         *
         * If I915_EXEC_FENCE_ARRAY is set, then this is a pointer to an array
         * of struct drm_i915_gem_exec_fence and num_cliprects is the length
         * of the array.
         *
         * If I915_EXEC_USE_EXTENSIONS is set, then this is a pointer to a
         * single struct i915_user_extension and num_cliprects is 0.
         */
        __u64 cliprects_ptr;
#define I915_EXEC_RING_MASK              (0x3f)
#define I915_EXEC_DEFAULT                (0<<0)
#define I915_EXEC_RENDER                 (1<<0)
#define I915_EXEC_BSD                    (2<<0)
#define I915_EXEC_BLT                    (3<<0)
#define I915_EXEC_VEBOX                  (4<<0)

/* Used for switching the constants addressing mode on gen4+ RENDER ring.
 * Gen6+ only supports relative addressing to dynamic state (default) and
 * absolute addressing.
 *
 * These flags are ignored for the BSD and BLT rings.
 */
#define I915_EXEC_CONSTANTS_MASK        (3<<6)
#define I915_EXEC_CONSTANTS_REL_GENERAL (0<<6) /* default */
#define I915_EXEC_CONSTANTS_ABSOLUTE    (1<<6)
#define I915_EXEC_CONSTANTS_REL_SURFACE (2<<6) /* gen4/5 only */
        __u64 flags;
        __u64 rsvd1; /* now used for context info */
        __u64 rsvd2;
};

/** Resets the SO write offset registers for transform feedback on gen7. */
#define I915_EXEC_GEN7_SOL_RESET        (1<<8)

/** Request a privileged ("secure") batch buffer. Note only available for
 * DRM_ROOT_ONLY | DRM_MASTER processes.
 */
#define I915_EXEC_SECURE                (1<<9)

/** Inform the kernel that the batch is and will always be pinned. This
 * negates the requirement for a workaround to be performed to avoid
 * an incoherent CS (such as can be found on 830/845). If this flag is
 * not passed, the kernel will endeavour to make sure the batch is
 * coherent with the CS before execution. If this flag is passed,
 * userspace assumes the responsibility for ensuring the same.
 */
#define I915_EXEC_IS_PINNED             (1<<10)

/** Provide a hint to the kernel that the command stream and auxiliary
 * state buffers already holds the correct presumed addresses and so the
 * relocation process may be skipped if no buffers need to be moved in
 * preparation for the execbuffer.
 */
#define I915_EXEC_NO_RELOC              (1<<11)

/** Use the reloc.handle as an index into the exec object array rather
 * than as the per-file handle.
 */
#define I915_EXEC_HANDLE_LUT            (1<<12)

/** Used for switching BSD rings on the platforms with two BSD rings */
#define I915_EXEC_BSD_SHIFT      (13)
#define I915_EXEC_BSD_MASK       (3 << I915_EXEC_BSD_SHIFT)
/* default ping-pong mode */
#define I915_EXEC_BSD_DEFAULT    (0 << I915_EXEC_BSD_SHIFT)
#define I915_EXEC_BSD_RING1      (1 << I915_EXEC_BSD_SHIFT)
#define I915_EXEC_BSD_RING2      (2 << I915_EXEC_BSD_SHIFT)

/** Tell the kernel that the batchbuffer is processed by
 *  the resource streamer.
 */
#define I915_EXEC_RESOURCE_STREAMER     (1<<15)

/* Setting I915_EXEC_FENCE_IN implies that lower_32_bits(rsvd2) represent
 * a sync_file fd to wait upon (in a nonblocking manner) prior to executing
 * the batch.
 *
 * Returns -EINVAL if the sync_file fd cannot be found.
 */
#define I915_EXEC_FENCE_IN              (1<<16)

/* Setting I915_EXEC_FENCE_OUT causes the ioctl to return a sync_file fd
 * in the upper_32_bits(rsvd2) upon success. Ownership of the fd is given
 * to the caller, and it should be close() after use. (The fd is a regular
 * file descriptor and will be cleaned up on process termination. It holds
 * a reference to the request, but nothing else.)
 *
 * The sync_file fd can be combined with other sync_file and passed either
 * to execbuf using I915_EXEC_FENCE_IN, to atomic KMS ioctls (so that a flip
 * will only occur after this request completes), or to other devices.
 *
 * Using I915_EXEC_FENCE_OUT requires use of
 * DRM_IOCTL_I915_GEM_EXECBUFFER2_WR ioctl so that the result is written
 * back to userspace. Failure to do so will cause the out-fence to always
 * be reported as zero, and the real fence fd to be leaked.
 */
#define I915_EXEC_FENCE_OUT             (1<<17)

/*
 * Traditionally the execbuf ioctl has only considered the final element in
 * the execobject[] to be the executable batch. Often though, the client
 * will known the batch object prior to construction and being able to place
 * it into the execobject[] array first can simplify the relocation tracking.
 * Setting I915_EXEC_BATCH_FIRST tells execbuf to use element 0 of the
 * execobject[] as the * batch instead (the default is to use the last
 * element).
 */
#define I915_EXEC_BATCH_FIRST           (1<<18)

/* Setting I915_FENCE_ARRAY implies that num_cliprects and cliprects_ptr
 * define an array of i915_gem_exec_fence structures which specify a set of
 * dma fences to wait upon or signal.
 */
#define I915_EXEC_FENCE_ARRAY   (1<<19)

/*
 * Setting I915_EXEC_FENCE_SUBMIT implies that lower_32_bits(rsvd2) represent
 * a sync_file fd to wait upon (in a nonblocking manner) prior to executing
 * the batch.
 *
 * Returns -EINVAL if the sync_file fd cannot be found.
 */
#define I915_EXEC_FENCE_SUBMIT          (1 << 20)

/*
 * Setting I915_EXEC_USE_EXTENSIONS implies that
 * drm_i915_gem_execbuffer2.cliprects_ptr is treated as a pointer to an linked
 * list of i915_user_extension. Each i915_user_extension node is the base of a
 * larger structure. The list of supported structures are listed in the
 * drm_i915_gem_execbuffer_ext enum.
 */
#define I915_EXEC_USE_EXTENSIONS        (1 << 21)

#define __I915_EXEC_UNKNOWN_FLAGS (-(I915_EXEC_USE_EXTENSIONS << 1))

#define I915_EXEC_CONTEXT_ID_MASK       (0xffffffff)
#define i915_execbuffer2_set_context_id(eb2, context) \
        (eb2).rsvd1 = context & I915_EXEC_CONTEXT_ID_MASK
#define i915_execbuffer2_get_context_id(eb2) \
        ((eb2).rsvd1 & I915_EXEC_CONTEXT_ID_MASK)

struct drm_i915_gem_pin {
        /** Handle of the buffer to be pinned. */
        __u32 handle;
        __u32 pad;

        /** alignment required within the aperture */
        __u64 alignment;

        /** Returned GTT offset of the buffer. */
        __u64 offset;
};

struct drm_i915_gem_unpin {
        /** Handle of the buffer to be unpinned. */
        __u32 handle;
        __u32 pad;
};

struct drm_i915_gem_busy {
        /** Handle of the buffer to check for busy */
        __u32 handle;

        /** Return busy status
         *
         * A return of 0 implies that the object is idle (after
         * having flushed any pending activity), and a non-zero return that
         * the object is still in-flight on the GPU. (The GPU has not yet
         * signaled completion for all pending requests that reference the
         * object.) An object is guaranteed to become idle eventually (so
         * long as no new GPU commands are executed upon it). Due to the
         * asynchronous nature of the hardware, an object reported
         * as busy may become idle before the ioctl is completed.
         *
         * Furthermore, if the object is busy, which engine is busy is only
         * provided as a guide and only indirectly by reporting its class
         * (there may be more than one engine in each class). There are race
         * conditions which prevent the report of which engines are busy from
         * being always accurate.  However, the converse is not true. If the
         * object is idle, the result of the ioctl, that all engines are idle,
         * is accurate.
         *
         * The returned dword is split into two fields to indicate both
         * the engine classess on which the object is being read, and the
         * engine class on which it is currently being written (if any).
         *
         * The low word (bits 0:15) indicate if the object is being written
         * to by any engine (there can only be one, as the GEM implicit
         * synchronisation rules force writes to be serialised). Only the
         * engine class (offset by 1, I915_ENGINE_CLASS_RENDER is reported as
         * 1 not 0 etc) for the last write is reported.
         *
         * The high word (bits 16:31) are a bitmask of which engines classes
         * are currently reading from the object. Multiple engines may be
         * reading from the object simultaneously.
         *
         * The value of each engine class is the same as specified in the
         * I915_CONTEXT_PARAM_ENGINES context parameter and via perf, i.e.
         * I915_ENGINE_CLASS_RENDER, I915_ENGINE_CLASS_COPY, etc.
         * Some hardware may have parallel execution engines, e.g. multiple
         * media engines, which are mapped to the same class identifier and so
         * are not separately reported for busyness.
         *
         * Caveat emptor:
         * Only the boolean result of this query is reliable; that is whether
         * the object is idle or busy. The report of which engines are busy
         * should be only used as a heuristic.
         */
        __u32 busy;
};

/**
 * struct drm_i915_gem_caching - Set or get the caching for given object
 * handle.
 *
 * Allow userspace to control the GTT caching bits for a given object when the
 * object is later mapped through the ppGTT(or GGTT on older platforms lacking
 * ppGTT support, or if the object is used for scanout). Note that this might
 * require unbinding the object from the GTT first, if its current caching value
 * doesn't match.
 *
 * Note that this all changes on discrete platforms, starting from DG1, the
 * set/get caching is no longer supported, and is now rejected.  Instead the CPU
 * caching attributes(WB vs WC) will become an immutable creation time property
 * for the object, along with the GTT caching level. For now we don't expose any
 * new uAPI for this, instead on DG1 this is all implicit, although this largely
 * shouldn't matter since DG1 is coherent by default(without any way of
 * controlling it).
 *
 * Implicit caching rules, starting from DG1:
 *
 *     - If any of the object placements (see &drm_i915_gem_create_ext_memory_regions)
 *       contain I915_MEMORY_CLASS_DEVICE then the object will be allocated and
 *       mapped as write-combined only.
 *
 *     - Everything else is always allocated and mapped as write-back, with the
 *       guarantee that everything is also coherent with the GPU.
 *
 * Note that this is likely to change in the future again, where we might need
 * more flexibility on future devices, so making this all explicit as part of a
 * new &drm_i915_gem_create_ext extension is probable.
 *
 * Side note: Part of the reason for this is that changing the at-allocation-time CPU
 * caching attributes for the pages might be required(and is expensive) if we
 * need to then CPU map the pages later with different caching attributes. This
 * inconsistent caching behaviour, while supported on x86, is not universally
 * supported on other architectures. So for simplicity we opt for setting
 * everything at creation time, whilst also making it immutable, on discrete
 * platforms.
 */
struct drm_i915_gem_caching {
        /**
         * @handle: Handle of the buffer to set/get the caching level.
         */
        __u32 handle;

        /**
         * @caching: The GTT caching level to apply or possible return value.
         *
         * The supported @caching values:
         *
         * I915_CACHING_NONE:
         *
         * GPU access is not coherent with CPU caches.  Default for machines
         * without an LLC. This means manual flushing might be needed, if we
         * want GPU access to be coherent.
         *
         * I915_CACHING_CACHED:
         *
         * GPU access is coherent with CPU caches and furthermore the data is
         * cached in last-level caches shared between CPU cores and the GPU GT.
         *
         * I915_CACHING_DISPLAY:
         *
         * Special GPU caching mode which is coherent with the scanout engines.
         * Transparently falls back to I915_CACHING_NONE on platforms where no
         * special cache mode (like write-through or gfdt flushing) is
         * available. The kernel automatically sets this mode when using a
         * buffer as a scanout target.  Userspace can manually set this mode to
         * avoid a costly stall and clflush in the hotpath of drawing the first
         * frame.
         */
#define I915_CACHING_NONE               0
#define I915_CACHING_CACHED             1
#define I915_CACHING_DISPLAY            2
        __u32 caching;
};

#define I915_TILING_NONE        0
#define I915_TILING_X           1
#define I915_TILING_Y           2
#define I915_TILING_LAST        I915_TILING_Y

#define I915_BIT_6_SWIZZLE_NONE         0
#define I915_BIT_6_SWIZZLE_9            1
#define I915_BIT_6_SWIZZLE_9_10         2
#define I915_BIT_6_SWIZZLE_9_11         3
#define I915_BIT_6_SWIZZLE_9_10_11      4
/* Not seen by userland */
#define I915_BIT_6_SWIZZLE_UNKNOWN      5
/* Seen by userland. */
#define I915_BIT_6_SWIZZLE_9_17         6
#define I915_BIT_6_SWIZZLE_9_10_17      7

struct drm_i915_gem_set_tiling {
        /** Handle of the buffer to have its tiling state updated */
        __u32 handle;

        /**
         * Tiling mode for the object (I915_TILING_NONE, I915_TILING_X,
         * I915_TILING_Y).
         *
         * This value is to be set on request, and will be updated by the
         * kernel on successful return with the actual chosen tiling layout.
         *
         * The tiling mode may be demoted to I915_TILING_NONE when the system
         * has bit 6 swizzling that can't be managed correctly by GEM.
         *
         * Buffer contents become undefined when changing tiling_mode.
         */
        __u32 tiling_mode;

        /**
         * Stride in bytes for the object when in I915_TILING_X or
         * I915_TILING_Y.
         */
        __u32 stride;

        /**
         * Returned address bit 6 swizzling required for CPU access through
         * mmap mapping.
         */
        __u32 swizzle_mode;
};

struct drm_i915_gem_get_tiling {
        /** Handle of the buffer to get tiling state for. */
        __u32 handle;

        /**
         * Current tiling mode for the object (I915_TILING_NONE, I915_TILING_X,
         * I915_TILING_Y).
         */
        __u32 tiling_mode;

        /**
         * Returned address bit 6 swizzling required for CPU access through
         * mmap mapping.
         */
        __u32 swizzle_mode;

        /**
         * Returned address bit 6 swizzling required for CPU access through
         * mmap mapping whilst bound.
         */
        __u32 phys_swizzle_mode;
};

struct drm_i915_gem_get_aperture {
        /** Total size of the aperture used by i915_gem_execbuffer, in bytes */
        __u64 aper_size;

        /**
         * Available space in the aperture used by i915_gem_execbuffer, in
         * bytes
         */
        __u64 aper_available_size;
};

struct drm_i915_get_pipe_from_crtc_id {
        /** ID of CRTC being requested **/
        __u32 crtc_id;

        /** pipe of requested CRTC **/
        __u32 pipe;
};

#define I915_MADV_WILLNEED 0
#define I915_MADV_DONTNEED 1
#define __I915_MADV_PURGED 2 /* internal state */

struct drm_i915_gem_madvise {
        /** Handle of the buffer to change the backing store advice */
        __u32 handle;

        /* Advice: either the buffer will be needed again in the near future,
         *         or wont be and could be discarded under memory pressure.
         */
        __u32 madv;

        /** Whether the backing store still exists. */
        __u32 retained;
};

/* flags */
#define I915_OVERLAY_TYPE_MASK          0xff
#define I915_OVERLAY_YUV_PLANAR         0x01
#define I915_OVERLAY_YUV_PACKED         0x02
#define I915_OVERLAY_RGB                0x03

#define I915_OVERLAY_DEPTH_MASK         0xff00
#define I915_OVERLAY_RGB24              0x1000
#define I915_OVERLAY_RGB16              0x2000
#define I915_OVERLAY_RGB15              0x3000
#define I915_OVERLAY_YUV422             0x0100
#define I915_OVERLAY_YUV411             0x0200
#define I915_OVERLAY_YUV420             0x0300
#define I915_OVERLAY_YUV410             0x0400

#define I915_OVERLAY_SWAP_MASK          0xff0000
#define I915_OVERLAY_NO_SWAP            0x000000
#define I915_OVERLAY_UV_SWAP            0x010000
#define I915_OVERLAY_Y_SWAP             0x020000
#define I915_OVERLAY_Y_AND_UV_SWAP      0x030000

#define I915_OVERLAY_FLAGS_MASK         0xff000000
#define I915_OVERLAY_ENABLE             0x01000000

struct drm_intel_overlay_put_image {
        /* various flags and src format description */
        __u32 flags;
        /* source picture description */
        __u32 bo_handle;
        /* stride values and offsets are in bytes, buffer relative */
        __u16 stride_Y; /* stride for packed formats */
        __u16 stride_UV;
        __u32 offset_Y; /* offset for packet formats */
        __u32 offset_U;
        __u32 offset_V;
        /* in pixels */
        __u16 src_width;
        __u16 src_height;
        /* to compensate the scaling factors for partially covered surfaces */
        __u16 src_scan_width;
        __u16 src_scan_height;
        /* output crtc description */
        __u32 crtc_id;
        __u16 dst_x;
        __u16 dst_y;
        __u16 dst_width;
        __u16 dst_height;
};

/* flags */
#define I915_OVERLAY_UPDATE_ATTRS       (1<<0)
#define I915_OVERLAY_UPDATE_GAMMA       (1<<1)
#define I915_OVERLAY_DISABLE_DEST_COLORKEY      (1<<2)
struct drm_intel_overlay_attrs {
        __u32 flags;
        __u32 color_key;
        __s32 brightness;
        __u32 contrast;
        __u32 saturation;
        __u32 gamma0;
        __u32 gamma1;
        __u32 gamma2;
        __u32 gamma3;
        __u32 gamma4;
        __u32 gamma5;
};

/*
 * Intel sprite handling
 *
 * Color keying works with a min/mask/max tuple.  Both source and destination
 * color keying is allowed.
 *
 * Source keying:
 * Sprite pixels within the min & max values, masked against the color channels
 * specified in the mask field, will be transparent.  All other pixels will
 * be displayed on top of the primary plane.  For RGB surfaces, only the min
 * and mask fields will be used; ranged compares are not allowed.
 *
 * Destination keying:
 * Primary plane pixels that match the min value, masked against the color
 * channels specified in the mask field, will be replaced by corresponding
 * pixels from the sprite plane.
 *
 * Note that source & destination keying are exclusive; only one can be
 * active on a given plane.
 */

#define I915_SET_COLORKEY_NONE          (1<<0) /* Deprecated. Instead set
                                                * flags==0 to disable colorkeying.
                                                */
#define I915_SET_COLORKEY_DESTINATION   (1<<1)
#define I915_SET_COLORKEY_SOURCE        (1<<2)
struct drm_intel_sprite_colorkey {
        __u32 plane_id;
        __u32 min_value;
        __u32 channel_mask;
        __u32 max_value;
        __u32 flags;
};

struct drm_i915_gem_wait {
        /** Handle of BO we shall wait on */
        __u32 bo_handle;
        __u32 flags;
        /** Number of nanoseconds to wait, Returns time remaining. */
        __s64 timeout_ns;
};

struct drm_i915_gem_context_create {
        __u32 ctx_id; /* output: id of new context*/
        __u32 pad;
};

struct drm_i915_gem_context_create_ext {
        __u32 ctx_id; /* output: id of new context*/
        __u32 flags;
#define I915_CONTEXT_CREATE_FLAGS_USE_EXTENSIONS        (1u << 0)
#define I915_CONTEXT_CREATE_FLAGS_SINGLE_TIMELINE       (1u << 1)
#define I915_CONTEXT_CREATE_FLAGS_UNKNOWN \
        (-(I915_CONTEXT_CREATE_FLAGS_SINGLE_TIMELINE << 1))
        __u64 extensions;
};

struct drm_i915_gem_context_param {
        __u32 ctx_id;
        __u32 size;
        __u64 param;
#define I915_CONTEXT_PARAM_BAN_PERIOD   0x1
/* I915_CONTEXT_PARAM_NO_ZEROMAP has been removed.  On the off chance
 * someone somewhere has attempted to use it, never re-use this context
 * param number.
 */
#define I915_CONTEXT_PARAM_NO_ZEROMAP   0x2
#define I915_CONTEXT_PARAM_GTT_SIZE     0x3
#define I915_CONTEXT_PARAM_NO_ERROR_CAPTURE     0x4
#define I915_CONTEXT_PARAM_BANNABLE     0x5
#define I915_CONTEXT_PARAM_PRIORITY     0x6
#define   I915_CONTEXT_MAX_USER_PRIORITY        1023 /* inclusive */
#define   I915_CONTEXT_DEFAULT_PRIORITY         0
#define   I915_CONTEXT_MIN_USER_PRIORITY        -1023 /* inclusive */
        /*
         * When using the following param, value should be a pointer to
         * drm_i915_gem_context_param_sseu.
         */
#define I915_CONTEXT_PARAM_SSEU         0x7

/*
 * Not all clients may want to attempt automatic recover of a context after
 * a hang (for example, some clients may only submit very small incremental
 * batches relying on known logical state of previous batches which will never
 * recover correctly and each attempt will hang), and so would prefer that
 * the context is forever banned instead.
 *
 * If set to false (0), after a reset, subsequent (and in flight) rendering
 * from this context is discarded, and the client will need to create a new
 * context to use instead.
 *
 * If set to true (1), the kernel will automatically attempt to recover the
 * context by skipping the hanging batch and executing the next batch starting
 * from the default context state (discarding the incomplete logical context
 * state lost due to the reset).
 *
 * On creation, all new contexts are marked as recoverable.
 */
#define I915_CONTEXT_PARAM_RECOVERABLE  0x8

        /*
         * The id of the associated virtual memory address space (ppGTT) of
         * this context. Can be retrieved and passed to another context
         * (on the same fd) for both to use the same ppGTT and so share
         * address layouts, and avoid reloading the page tables on context
         * switches between themselves.
         *
         * See DRM_I915_GEM_VM_CREATE and DRM_I915_GEM_VM_DESTROY.
         */
#define I915_CONTEXT_PARAM_VM           0x9

/*
 * I915_CONTEXT_PARAM_ENGINES:
 *
 * Bind this context to operate on this subset of available engines. Henceforth,
 * the I915_EXEC_RING selector for DRM_IOCTL_I915_GEM_EXECBUFFER2 operates as
 * an index into this array of engines; I915_EXEC_DEFAULT selecting engine[0]
 * and upwards. Slots 0...N are filled in using the specified (class, instance).
 * Use
 *      engine_class: I915_ENGINE_CLASS_INVALID,
 *      engine_instance: I915_ENGINE_CLASS_INVALID_NONE
 * to specify a gap in the array that can be filled in later, e.g. by a
 * virtual engine used for load balancing.
 *
 * Setting the number of engines bound to the context to 0, by passing a zero
 * sized argument, will revert back to default settings.
 *
 * See struct i915_context_param_engines.
 *
 * Extensions:
 *   i915_context_engines_load_balance (I915_CONTEXT_ENGINES_EXT_LOAD_BALANCE)
 *   i915_context_engines_bond (I915_CONTEXT_ENGINES_EXT_BOND)
 */
#define I915_CONTEXT_PARAM_ENGINES      0xa

/*
 * I915_CONTEXT_PARAM_PERSISTENCE:
 *
 * Allow the context and active rendering to survive the process until
 * completion. Persistence allows fire-and-forget clients to queue up a
 * bunch of work, hand the output over to a display server and then quit.
 * If the context is marked as not persistent, upon closing (either via
 * an explicit DRM_I915_GEM_CONTEXT_DESTROY or implicitly from file closure
 * or process termination), the context and any outstanding requests will be
 * cancelled (and exported fences for cancelled requests marked as -EIO).
 *
 * By default, new contexts allow persistence.
 */
#define I915_CONTEXT_PARAM_PERSISTENCE  0xb

/* This API has been removed.  On the off chance someone somewhere has
 * attempted to use it, never re-use this context param number.
 */
#define I915_CONTEXT_PARAM_RINGSIZE     0xc
/* Must be kept compact -- no holes and well documented */

        __u64 value;
};

/*
 * Context SSEU programming
 *
 * It may be necessary for either functional or performance reason to configure
 * a context to run with a reduced number of SSEU (where SSEU stands for Slice/
 * Sub-slice/EU).
 *
 * This is done by configuring SSEU configuration using the below
 * @struct drm_i915_gem_context_param_sseu for every supported engine which
 * userspace intends to use.
 *
 * Not all GPUs or engines support this functionality in which case an error
 * code -ENODEV will be returned.
 *
 * Also, flexibility of possible SSEU configuration permutations varies between
 * GPU generations and software imposed limitations. Requesting such a
 * combination will return an error code of -EINVAL.
 *
 * NOTE: When perf/OA is active the context's SSEU configuration is ignored in
 * favour of a single global setting.
 */
struct drm_i915_gem_context_param_sseu {
        /*
         * Engine class & instance to be configured or queried.
         */
        struct i915_engine_class_instance engine;

        /*
         * Unknown flags must be cleared to zero.
         */
        __u32 flags;
#define I915_CONTEXT_SSEU_FLAG_ENGINE_INDEX (1u << 0)

        /*
         * Mask of slices to enable for the context. Valid values are a subset
         * of the bitmask value returned for I915_PARAM_SLICE_MASK.
         */
        __u64 slice_mask;

        /*
         * Mask of subslices to enable for the context. Valid values are a
         * subset of the bitmask value return by I915_PARAM_SUBSLICE_MASK.
         */
        __u64 subslice_mask;

        /*
         * Minimum/Maximum number of EUs to enable per subslice for the
         * context. min_eus_per_subslice must be inferior or equal to
         * max_eus_per_subslice.
         */
        __u16 min_eus_per_subslice;
        __u16 max_eus_per_subslice;

        /*
         * Unused for now. Must be cleared to zero.
         */
        __u32 rsvd;
};

/**
 * DOC: Virtual Engine uAPI
 *
 * Virtual engine is a concept where userspace is able to configure a set of
 * physical engines, submit a batch buffer, and let the driver execute it on any
 * engine from the set as it sees fit.
 *
 * This is primarily useful on parts which have multiple instances of a same
 * class engine, like for example GT3+ Skylake parts with their two VCS engines.
 *
 * For instance userspace can enumerate all engines of a certain class using the
 * previously described `Engine Discovery uAPI`_. After that userspace can
 * create a GEM context with a placeholder slot for the virtual engine (using
 * `I915_ENGINE_CLASS_INVALID` and `I915_ENGINE_CLASS_INVALID_NONE` for class
 * and instance respectively) and finally using the
 * `I915_CONTEXT_ENGINES_EXT_LOAD_BALANCE` extension place a virtual engine in
 * the same reserved slot.
 *
 * Example of creating a virtual engine and submitting a batch buffer to it:
 *
 * .. code-block:: C
 *
 *      I915_DEFINE_CONTEXT_ENGINES_LOAD_BALANCE(virtual, 2) = {
 *              .base.name = I915_CONTEXT_ENGINES_EXT_LOAD_BALANCE,
 *              .engine_index = 0, // Place this virtual engine into engine map slot 0
 *              .num_siblings = 2,
 *              .engines = { { I915_ENGINE_CLASS_VIDEO, 0 },
 *                           { I915_ENGINE_CLASS_VIDEO, 1 }, },
 *      };
 *      I915_DEFINE_CONTEXT_PARAM_ENGINES(engines, 1) = {
 *              .engines = { { I915_ENGINE_CLASS_INVALID,
 *                             I915_ENGINE_CLASS_INVALID_NONE } },
 *              .extensions = to_user_pointer(&virtual), // Chains after load_balance extension
 *      };
 *      struct drm_i915_gem_context_create_ext_setparam p_engines = {
 *              .base = {
 *                      .name = I915_CONTEXT_CREATE_EXT_SETPARAM,
 *              },
 *              .param = {
 *                      .param = I915_CONTEXT_PARAM_ENGINES,
 *                      .value = to_user_pointer(&engines),
 *                      .size = sizeof(engines),
 *              },
 *      };
 *      struct drm_i915_gem_context_create_ext create = {
 *              .flags = I915_CONTEXT_CREATE_FLAGS_USE_EXTENSIONS,
 *              .extensions = to_user_pointer(&p_engines);
 *      };
 *
 *      ctx_id = gem_context_create_ext(drm_fd, &create);
 *
 *      // Now we have created a GEM context with its engine map containing a
 *      // single virtual engine. Submissions to this slot can go either to
 *      // vcs0 or vcs1, depending on the load balancing algorithm used inside
 *      // the driver. The load balancing is dynamic from one batch buffer to
 *      // another and transparent to userspace.
 *
 *      ...
 *      execbuf.rsvd1 = ctx_id;
 *      execbuf.flags = 0; // Submits to index 0 which is the virtual engine
 *      gem_execbuf(drm_fd, &execbuf);
 */

/*
 * i915_context_engines_load_balance:
 *
 * Enable load balancing across this set of engines.
 *
 * Into the I915_EXEC_DEFAULT slot [0], a virtual engine is created that when
 * used will proxy the execbuffer request onto one of the set of engines
 * in such a way as to distribute the load evenly across the set.
 *
 * The set of engines must be compatible (e.g. the same HW class) as they
 * will share the same logical GPU context and ring.
 *
 * To intermix rendering with the virtual engine and direct rendering onto
 * the backing engines (bypassing the load balancing proxy), the context must
 * be defined to use a single timeline for all engines.
 */
struct i915_context_engines_load_balance {
        struct i915_user_extension base;

        __u16 engine_index;
        __u16 num_siblings;
        __u32 flags; /* all undefined flags must be zero */

        __u64 mbz64; /* reserved for future use; must be zero */

        struct i915_engine_class_instance engines[0];
} __attribute__((packed));

#define I915_DEFINE_CONTEXT_ENGINES_LOAD_BALANCE(name__, N__) struct { \
        struct i915_user_extension base; \
        __u16 engine_index; \
        __u16 num_siblings; \
        __u32 flags; \
        __u64 mbz64; \
        struct i915_engine_class_instance engines[N__]; \
} __attribute__((packed)) name__

/*
 * i915_context_engines_bond:
 *
 * Constructed bonded pairs for execution within a virtual engine.
 *
 * All engines are equal, but some are more equal than others. Given
 * the distribution of resources in the HW, it may be preferable to run
 * a request on a given subset of engines in parallel to a request on a
 * specific engine. We enable this selection of engines within a virtual
 * engine by specifying bonding pairs, for any given master engine we will
 * only execute on one of the corresponding siblings within the virtual engine.
 *
 * To execute a request in parallel on the master engine and a sibling requires
 * coordination with a I915_EXEC_FENCE_SUBMIT.
 */
struct i915_context_engines_bond {
        struct i915_user_extension base;

        struct i915_engine_class_instance master;

        __u16 virtual_index; /* index of virtual engine in ctx->engines[] */
        __u16 num_bonds;

        __u64 flags; /* all undefined flags must be zero */
        __u64 mbz64[4]; /* reserved for future use; must be zero */

        struct i915_engine_class_instance engines[0];
} __attribute__((packed));

#define I915_DEFINE_CONTEXT_ENGINES_BOND(name__, N__) struct { \
        struct i915_user_extension base; \
        struct i915_engine_class_instance master; \
        __u16 virtual_index; \
        __u16 num_bonds; \
        __u64 flags; \
        __u64 mbz64[4]; \
        struct i915_engine_class_instance engines[N__]; \
} __attribute__((packed)) name__

/**
 * DOC: Context Engine Map uAPI
 *
 * Context engine map is a new way of addressing engines when submitting batch-
 * buffers, replacing the existing way of using identifiers like `I915_EXEC_BLT`
 * inside the flags field of `struct drm_i915_gem_execbuffer2`.
 *
 * To use it created GEM contexts need to be configured with a list of engines
 * the user is intending to submit to. This is accomplished using the
 * `I915_CONTEXT_PARAM_ENGINES` parameter and `struct
 * i915_context_param_engines`.
 *
 * For such contexts the `I915_EXEC_RING_MASK` field becomes an index into the
 * configured map.
 *
 * Example of creating such context and submitting against it:
 *
 * .. code-block:: C
 *
 *      I915_DEFINE_CONTEXT_PARAM_ENGINES(engines, 2) = {
 *              .engines = { { I915_ENGINE_CLASS_RENDER, 0 },
 *                           { I915_ENGINE_CLASS_COPY, 0 } }
 *      };
 *      struct drm_i915_gem_context_create_ext_setparam p_engines = {
 *              .base = {
 *                      .name = I915_CONTEXT_CREATE_EXT_SETPARAM,
 *              },
 *              .param = {
 *                      .param = I915_CONTEXT_PARAM_ENGINES,
 *                      .value = to_user_pointer(&engines),
 *                      .size = sizeof(engines),
 *              },
 *      };
 *      struct drm_i915_gem_context_create_ext create = {
 *              .flags = I915_CONTEXT_CREATE_FLAGS_USE_EXTENSIONS,
 *              .extensions = to_user_pointer(&p_engines);
 *      };
 *
 *      ctx_id = gem_context_create_ext(drm_fd, &create);
 *
 *      // We have now created a GEM context with two engines in the map:
 *      // Index 0 points to rcs0 while index 1 points to bcs0. Other engines
 *      // will not be accessible from this context.
 *
 *      ...
 *      execbuf.rsvd1 = ctx_id;
 *      execbuf.flags = 0; // Submits to index 0, which is rcs0 for this context
 *      gem_execbuf(drm_fd, &execbuf);
 *
 *      ...
 *      execbuf.rsvd1 = ctx_id;
 *      execbuf.flags = 1; // Submits to index 0, which is bcs0 for this context
 *      gem_execbuf(drm_fd, &execbuf);
 */

struct i915_context_param_engines {
        __u64 extensions; /* linked chain of extension blocks, 0 terminates */
#define I915_CONTEXT_ENGINES_EXT_LOAD_BALANCE 0 /* see i915_context_engines_load_balance */
#define I915_CONTEXT_ENGINES_EXT_BOND 1 /* see i915_context_engines_bond */
        struct i915_engine_class_instance engines[0];
} __attribute__((packed));

#define I915_DEFINE_CONTEXT_PARAM_ENGINES(name__, N__) struct { \
        __u64 extensions; \
        struct i915_engine_class_instance engines[N__]; \
} __attribute__((packed)) name__

struct drm_i915_gem_context_create_ext_setparam {
#define I915_CONTEXT_CREATE_EXT_SETPARAM 0
        struct i915_user_extension base;
        struct drm_i915_gem_context_param param;
};

/* This API has been removed.  On the off chance someone somewhere has
 * attempted to use it, never re-use this extension number.
 */
#define I915_CONTEXT_CREATE_EXT_CLONE 1

struct drm_i915_gem_context_destroy {
        __u32 ctx_id;
        __u32 pad;
};

/*
 * DRM_I915_GEM_VM_CREATE -
 *
 * Create a new virtual memory address space (ppGTT) for use within a context
 * on the same file. Extensions can be provided to configure exactly how the
 * address space is setup upon creation.
 *
 * The id of new VM (bound to the fd) for use with I915_CONTEXT_PARAM_VM is
 * returned in the outparam @id.
 *
 * No flags are defined, with all bits reserved and must be zero.
 *
 * An extension chain maybe provided, starting with @extensions, and terminated
 * by the @next_extension being 0. Currently, no extensions are defined.
 *
 * DRM_I915_GEM_VM_DESTROY -
 *
 * Destroys a previously created VM id, specified in @id.
 *
 * No extensions or flags are allowed currently, and so must be zero.
 */
struct drm_i915_gem_vm_control {
        __u64 extensions;
        __u32 flags;
        __u32 vm_id;
};

struct drm_i915_reg_read {
        /*
         * Register offset.
         * For 64bit wide registers where the upper 32bits don't immediately
         * follow the lower 32bits, the offset of the lower 32bits must
         * be specified
         */
        __u64 offset;
#define I915_REG_READ_8B_WA (1ul << 0)

        __u64 val; /* Return value */
};

/* Known registers:
 *
 * Render engine timestamp - 0x2358 + 64bit - gen7+
 * - Note this register returns an invalid value if using the default
 *   single instruction 8byte read, in order to workaround that pass
 *   flag I915_REG_READ_8B_WA in offset field.
 *
 */

struct drm_i915_reset_stats {
        __u32 ctx_id;
        __u32 flags;

        /* All resets since boot/module reload, for all contexts */
        __u32 reset_count;

        /* Number of batches lost when active in GPU, for this context */
        __u32 batch_active;

        /* Number of batches lost pending for execution, for this context */
        __u32 batch_pending;

        __u32 pad;
};

struct drm_i915_gem_userptr {
        __u64 user_ptr;
        __u64 user_size;
        __u32 flags;
#define I915_USERPTR_READ_ONLY 0x1
#define I915_USERPTR_UNSYNCHRONIZED 0x80000000
        /**
         * Returned handle for the object.
         *
         * Object handles are nonzero.
         */
        __u32 handle;
};

enum drm_i915_oa_format {
        I915_OA_FORMAT_A13 = 1,     /* HSW only */
        I915_OA_FORMAT_A29,         /* HSW only */
        I915_OA_FORMAT_A13_B8_C8,   /* HSW only */
        I915_OA_FORMAT_B4_C8,       /* HSW only */
        I915_OA_FORMAT_A45_B8_C8,   /* HSW only */
        I915_OA_FORMAT_B4_C8_A16,   /* HSW only */
        I915_OA_FORMAT_C4_B8,       /* HSW+ */

        /* Gen8+ */
        I915_OA_FORMAT_A12,
        I915_OA_FORMAT_A12_B8_C8,
        I915_OA_FORMAT_A32u40_A4u32_B8_C8,

        I915_OA_FORMAT_MAX          /* non-ABI */
};

enum drm_i915_perf_property_id {
        /**
         * Open the stream for a specific context handle (as used with
         * execbuffer2). A stream opened for a specific context this way
         * won't typically require root privileges.
         *
         * This property is available in perf revision 1.
         */
        DRM_I915_PERF_PROP_CTX_HANDLE = 1,

        /**
         * A value of 1 requests the inclusion of raw OA unit reports as
         * part of stream samples.
         *
         * This property is available in perf revision 1.
         */
        DRM_I915_PERF_PROP_SAMPLE_OA,

        /**
         * The value specifies which set of OA unit metrics should be
         * configured, defining the contents of any OA unit reports.
         *
         * This property is available in perf revision 1.
         */
        DRM_I915_PERF_PROP_OA_METRICS_SET,

        /**
         * The value specifies the size and layout of OA unit reports.
         *
         * This property is available in perf revision 1.
         */
        DRM_I915_PERF_PROP_OA_FORMAT,

        /**
         * Specifying this property implicitly requests periodic OA unit
         * sampling and (at least on Haswell) the sampling frequency is derived
         * from this exponent as follows:
         *
         *   80ns * 2^(period_exponent + 1)
         *
         * This property is available in perf revision 1.
         */
        DRM_I915_PERF_PROP_OA_EXPONENT,

        /**
         * Specifying this property is only valid when specify a context to
         * filter with DRM_I915_PERF_PROP_CTX_HANDLE. Specifying this property
         * will hold preemption of the particular context we want to gather
         * performance data about. The execbuf2 submissions must include a
         * drm_i915_gem_execbuffer_ext_perf parameter for this to apply.
         *
         * This property is available in perf revision 3.
         */
        DRM_I915_PERF_PROP_HOLD_PREEMPTION,

        /**
         * Specifying this pins all contexts to the specified SSEU power
         * configuration for the duration of the recording.
         *
         * This parameter's value is a pointer to a struct
         * drm_i915_gem_context_param_sseu.
         *
         * This property is available in perf revision 4.
         */
        DRM_I915_PERF_PROP_GLOBAL_SSEU,

        /**
         * This optional parameter specifies the timer interval in nanoseconds
         * at which the i915 driver will check the OA buffer for available data.
         * Minimum allowed value is 100 microseconds. A default value is used by
         * the driver if this parameter is not specified. Note that larger timer
         * values will reduce cpu consumption during OA perf captures. However,
         * excessively large values would potentially result in OA buffer
         * overwrites as captures reach end of the OA buffer.
         *
         * This property is available in perf revision 5.
         */
        DRM_I915_PERF_PROP_POLL_OA_PERIOD,

        DRM_I915_PERF_PROP_MAX /* non-ABI */
};

struct drm_i915_perf_open_param {
        __u32 flags;
#define I915_PERF_FLAG_FD_CLOEXEC       (1<<0)
#define I915_PERF_FLAG_FD_NONBLOCK      (1<<1)
#define I915_PERF_FLAG_DISABLED         (1<<2)

        /** The number of u64 (id, value) pairs */
        __u32 num_properties;

        /**
         * Pointer to array of u64 (id, value) pairs configuring the stream
         * to open.
         */
        __u64 properties_ptr;
};

/*
 * Enable data capture for a stream that was either opened in a disabled state
 * via I915_PERF_FLAG_DISABLED or was later disabled via
 * I915_PERF_IOCTL_DISABLE.
 *
 * It is intended to be cheaper to disable and enable a stream than it may be
 * to close and re-open a stream with the same configuration.
 *
 * It's undefined whether any pending data for the stream will be lost.
 *
 * This ioctl is available in perf revision 1.
 */
#define I915_PERF_IOCTL_ENABLE  _IO('i', 0x0)

/*
 * Disable data capture for a stream.
 *
 * It is an error to try and read a stream that is disabled.
 *
 * This ioctl is available in perf revision 1.
 */
#define I915_PERF_IOCTL_DISABLE _IO('i', 0x1)

/*
 * Change metrics_set captured by a stream.
 *
 * If the stream is bound to a specific context, the configuration change
 * will performed inline with that context such that it takes effect before
 * the next execbuf submission.
 *
 * Returns the previously bound metrics set id, or a negative error code.
 *
 * This ioctl is available in perf revision 2.
 */
#define I915_PERF_IOCTL_CONFIG  _IO('i', 0x2)

/*
 * Common to all i915 perf records
 */
struct drm_i915_perf_record_header {
        __u32 type;
        __u16 pad;
        __u16 size;
};

enum drm_i915_perf_record_type {

        /**
         * Samples are the work horse record type whose contents are extensible
         * and defined when opening an i915 perf stream based on the given
         * properties.
         *
         * Boolean properties following the naming convention
         * DRM_I915_PERF_SAMPLE_xyz_PROP request the inclusion of 'xyz' data in
         * every sample.
         *
         * The order of these sample properties given by userspace has no
         * affect on the ordering of data within a sample. The order is
         * documented here.
         *
         * struct {
         *     struct drm_i915_perf_record_header header;
         *
         *     { u32 oa_report[]; } && DRM_I915_PERF_PROP_SAMPLE_OA
         * };
         */
        DRM_I915_PERF_RECORD_SAMPLE = 1,

        /*
         * Indicates that one or more OA reports were not written by the
         * hardware. This can happen for example if an MI_REPORT_PERF_COUNT
         * command collides with periodic sampling - which would be more likely
         * at higher sampling frequencies.
         */
        DRM_I915_PERF_RECORD_OA_REPORT_LOST = 2,

        /**
         * An error occurred that resulted in all pending OA reports being lost.
         */
        DRM_I915_PERF_RECORD_OA_BUFFER_LOST = 3,

        DRM_I915_PERF_RECORD_MAX /* non-ABI */
};

/*
 * Structure to upload perf dynamic configuration into the kernel.
 */
struct drm_i915_perf_oa_config {
        /** String formatted like "%08x-%04x-%04x-%04x-%012x" */
        char uuid[36];

        __u32 n_mux_regs;
        __u32 n_boolean_regs;
        __u32 n_flex_regs;

        /*
         * These fields are pointers to tuples of u32 values (register address,
         * value). For example the expected length of the buffer pointed by
         * mux_regs_ptr is (2 * sizeof(u32) * n_mux_regs).
         */
        __u64 mux_regs_ptr;
        __u64 boolean_regs_ptr;
        __u64 flex_regs_ptr;
};

/**
 * struct drm_i915_query_item - An individual query for the kernel to process.
 *
 * The behaviour is determined by the @query_id. Note that exactly what
 * @data_ptr is also depends on the specific @query_id.
 */
struct drm_i915_query_item {
        /** @query_id: The id for this query */
        __u64 query_id;
#define DRM_I915_QUERY_TOPOLOGY_INFO    1
#define DRM_I915_QUERY_ENGINE_INFO      2
#define DRM_I915_QUERY_PERF_CONFIG      3
#define DRM_I915_QUERY_MEMORY_REGIONS   4
/* Must be kept compact -- no holes and well documented */

        /**
         * @length:
         *
         * When set to zero by userspace, this is filled with the size of the
         * data to be written at the @data_ptr pointer. The kernel sets this
         * value to a negative value to signal an error on a particular query
         * item.
         */
        __s32 length;

        /**
         * @flags:
         *
         * When query_id == DRM_I915_QUERY_TOPOLOGY_INFO, must be 0.
         *
         * When query_id == DRM_I915_QUERY_PERF_CONFIG, must be one of the
         * following:
         *
         *      - DRM_I915_QUERY_PERF_CONFIG_LIST
         *      - DRM_I915_QUERY_PERF_CONFIG_DATA_FOR_UUID
         *      - DRM_I915_QUERY_PERF_CONFIG_FOR_UUID
         */
        __u32 flags;
#define DRM_I915_QUERY_PERF_CONFIG_LIST          1
#define DRM_I915_QUERY_PERF_CONFIG_DATA_FOR_UUID 2
#define DRM_I915_QUERY_PERF_CONFIG_DATA_FOR_ID   3

        /**
         * @data_ptr:
         *
         * Data will be written at the location pointed by @data_ptr when the
         * value of @length matches the length of the data to be written by the
         * kernel.
         */
        __u64 data_ptr;
};

/**
 * struct drm_i915_query - Supply an array of struct drm_i915_query_item for the
 * kernel to fill out.
 *
 * Note that this is generally a two step process for each struct
 * drm_i915_query_item in the array:
 *
 * 1. Call the DRM_IOCTL_I915_QUERY, giving it our array of struct
 *    drm_i915_query_item, with &drm_i915_query_item.length set to zero. The
 *    kernel will then fill in the size, in bytes, which tells userspace how
 *    memory it needs to allocate for the blob(say for an array of properties).
 *
 * 2. Next we call DRM_IOCTL_I915_QUERY again, this time with the
 *    &drm_i915_query_item.data_ptr equal to our newly allocated blob. Note that
 *    the &drm_i915_query_item.length should still be the same as what the
 *    kernel previously set. At this point the kernel can fill in the blob.
 *
 * Note that for some query items it can make sense for userspace to just pass
 * in a buffer/blob equal to or larger than the required size. In this case only
 * a single ioctl call is needed. For some smaller query items this can work
 * quite well.
 *
 */
struct drm_i915_query {
        /** @num_items: The number of elements in the @items_ptr array */
        __u32 num_items;

        /**
         * @flags: Unused for now. Must be cleared to zero.
         */
        __u32 flags;

        /**
         * @items_ptr:
         *
         * Pointer to an array of struct drm_i915_query_item. The number of
         * array elements is @num_items.
         */
        __u64 items_ptr;
};

/*
 * Data written by the kernel with query DRM_I915_QUERY_TOPOLOGY_INFO :
 *
 * data: contains the 3 pieces of information :
 *
 * - the slice mask with one bit per slice telling whether a slice is
 *   available. The availability of slice X can be queried with the following
 *   formula :
 *
 *           (data[X / 8] >> (X % 8)) & 1
 *
 * - the subslice mask for each slice with one bit per subslice telling
 *   whether a subslice is available. Gen12 has dual-subslices, which are
 *   similar to two gen11 subslices. For gen12, this array represents dual-
 *   subslices. The availability of subslice Y in slice X can be queried
 *   with the following formula :
 *
 *           (data[subslice_offset +
 *                 X * subslice_stride +
 *                 Y / 8] >> (Y % 8)) & 1
 *
 * - the EU mask for each subslice in each slice with one bit per EU telling
 *   whether an EU is available. The availability of EU Z in subslice Y in
 *   slice X can be queried with the following formula :
 *
 *           (data[eu_offset +
 *                 (X * max_subslices + Y) * eu_stride +
 *                 Z / 8] >> (Z % 8)) & 1
 */
struct drm_i915_query_topology_info {
        /*
         * Unused for now. Must be cleared to zero.
         */
        __u16 flags;

        __u16 max_slices;
        __u16 max_subslices;
        __u16 max_eus_per_subslice;

        /*
         * Offset in data[] at which the subslice masks are stored.
         */
        __u16 subslice_offset;

        /*
         * Stride at which each of the subslice masks for each slice are
         * stored.
         */
        __u16 subslice_stride;

        /*
         * Offset in data[] at which the EU masks are stored.
         */
        __u16 eu_offset;

        /*
         * Stride at which each of the EU masks for each subslice are stored.
         */
        __u16 eu_stride;

        __u8 data[];
};

/**
 * DOC: Engine Discovery uAPI
 *
 * Engine discovery uAPI is a way of enumerating physical engines present in a
 * GPU associated with an open i915 DRM file descriptor. This supersedes the old
 * way of using `DRM_IOCTL_I915_GETPARAM` and engine identifiers like
 * `I915_PARAM_HAS_BLT`.
 *
 * The need for this interface came starting with Icelake and newer GPUs, which
 * started to establish a pattern of having multiple engines of a same class,
 * where not all instances were always completely functionally equivalent.
 *
 * Entry point for this uapi is `DRM_IOCTL_I915_QUERY` with the
 * `DRM_I915_QUERY_ENGINE_INFO` as the queried item id.
 *
 * Example for getting the list of engines:
 *
 * .. code-block:: C
 *
 *      struct drm_i915_query_engine_info *info;
 *      struct drm_i915_query_item item = {
 *              .query_id = DRM_I915_QUERY_ENGINE_INFO;
 *      };
 *      struct drm_i915_query query = {
 *              .num_items = 1,
 *              .items_ptr = (uintptr_t)&item,
 *      };
 *      int err, i;
 *
 *      // First query the size of the blob we need, this needs to be large
 *      // enough to hold our array of engines. The kernel will fill out the
 *      // item.length for us, which is the number of bytes we need.
 *      //
 *      // Alternatively a large buffer can be allocated straight away enabling
 *      // querying in one pass, in which case item.length should contain the
 *      // length of the provided buffer.
 *      err = ioctl(fd, DRM_IOCTL_I915_QUERY, &query);
 *      if (err) ...
 *
 *      info = calloc(1, item.length);
 *      // Now that we allocated the required number of bytes, we call the ioctl
 *      // again, this time with the data_ptr pointing to our newly allocated
 *      // blob, which the kernel can then populate with info on all engines.
 *      item.data_ptr = (uintptr_t)&info,
 *
 *      err = ioctl(fd, DRM_IOCTL_I915_QUERY, &query);
 *      if (err) ...
 *
 *      // We can now access each engine in the array
 *      for (i = 0; i < info->num_engines; i++) {
 *              struct drm_i915_engine_info einfo = info->engines[i];
 *              u16 class = einfo.engine.class;
 *              u16 instance = einfo.engine.instance;
 *              ....
 *      }
 *
 *      free(info);
 *
 * Each of the enumerated engines, apart from being defined by its class and
 * instance (see `struct i915_engine_class_instance`), also can have flags and
 * capabilities defined as documented in i915_drm.h.
 *
 * For instance video engines which support HEVC encoding will have the
 * `I915_VIDEO_CLASS_CAPABILITY_HEVC` capability bit set.
 *
 * Engine discovery only fully comes to its own when combined with the new way
 * of addressing engines when submitting batch buffers using contexts with
 * engine maps configured.
 */

/**
 * struct drm_i915_engine_info
 *
 * Describes one engine and it's capabilities as known to the driver.
 */
struct drm_i915_engine_info {
        /** @engine: Engine class and instance. */
        struct i915_engine_class_instance engine;

        /** @rsvd0: Reserved field. */
        __u32 rsvd0;

        /** @flags: Engine flags. */
        __u64 flags;

        /** @capabilities: Capabilities of this engine. */
        __u64 capabilities;
#define I915_VIDEO_CLASS_CAPABILITY_HEVC                (1 << 0)
#define I915_VIDEO_AND_ENHANCE_CLASS_CAPABILITY_SFC     (1 << 1)

        /** @rsvd1: Reserved fields. */
        __u64 rsvd1[4];
};

/**
 * struct drm_i915_query_engine_info
 *
 * Engine info query enumerates all engines known to the driver by filling in
 * an array of struct drm_i915_engine_info structures.
 */
struct drm_i915_query_engine_info {
        /** @num_engines: Number of struct drm_i915_engine_info structs following. */
        __u32 num_engines;

        /** @rsvd: MBZ */
        __u32 rsvd[3];

        /** @engines: Marker for drm_i915_engine_info structures. */
        struct drm_i915_engine_info engines[];
};

/*
 * Data written by the kernel with query DRM_I915_QUERY_PERF_CONFIG.
 */
struct drm_i915_query_perf_config {
        union {
                /*
                 * When query_item.flags == DRM_I915_QUERY_PERF_CONFIG_LIST, i915 sets
                 * this fields to the number of configurations available.
                 */
                __u64 n_configs;

                /*
                 * When query_id == DRM_I915_QUERY_PERF_CONFIG_DATA_FOR_ID,
                 * i915 will use the value in this field as configuration
                 * identifier to decide what data to write into config_ptr.
                 */
                __u64 config;

                /*
                 * When query_id == DRM_I915_QUERY_PERF_CONFIG_DATA_FOR_UUID,
                 * i915 will use the value in this field as configuration
                 * identifier to decide what data to write into config_ptr.
                 *
                 * String formatted like "%08x-%04x-%04x-%04x-%012x"
                 */
                char uuid[36];
        };

        /*
         * Unused for now. Must be cleared to zero.
         */
        __u32 flags;

        /*
         * When query_item.flags == DRM_I915_QUERY_PERF_CONFIG_LIST, i915 will
         * write an array of __u64 of configuration identifiers.
         *
         * When query_item.flags == DRM_I915_QUERY_PERF_CONFIG_DATA, i915 will
         * write a struct drm_i915_perf_oa_config. If the following fields of
         * drm_i915_perf_oa_config are set not set to 0, i915 will write into
         * the associated pointers the values of submitted when the
         * configuration was created :
         *
         *         - n_mux_regs
         *         - n_boolean_regs
         *         - n_flex_regs
         */
        __u8 data[];
};

/**
 * enum drm_i915_gem_memory_class - Supported memory classes
 */
enum drm_i915_gem_memory_class {
        /** @I915_MEMORY_CLASS_SYSTEM: System memory */
        I915_MEMORY_CLASS_SYSTEM = 0,
        /** @I915_MEMORY_CLASS_DEVICE: Device local-memory */
        I915_MEMORY_CLASS_DEVICE,
};

/**
 * struct drm_i915_gem_memory_class_instance - Identify particular memory region
 */
struct drm_i915_gem_memory_class_instance {
        /** @memory_class: See enum drm_i915_gem_memory_class */
        __u16 memory_class;

        /** @memory_instance: Which instance */
        __u16 memory_instance;
};

/**
 * struct drm_i915_memory_region_info - Describes one region as known to the
 * driver.
 *
 * Note that we reserve some stuff here for potential future work. As an example
 * we might want expose the capabilities for a given region, which could include
 * things like if the region is CPU mappable/accessible, what are the supported
 * mapping types etc.
 *
 * Note that to extend struct drm_i915_memory_region_info and struct
 * drm_i915_query_memory_regions in the future the plan is to do the following:
 *
 * .. code-block:: C
 *
 *      struct drm_i915_memory_region_info {
 *              struct drm_i915_gem_memory_class_instance region;
 *              union {
 *                      __u32 rsvd0;
 *                      __u32 new_thing1;
 *              };
 *              ...
 *              union {
 *                      __u64 rsvd1[8];
 *                      struct {
 *                              __u64 new_thing2;
 *                              __u64 new_thing3;
 *                              ...
 *                      };
 *              };
 *      };
 *
 * With this things should remain source compatible between versions for
 * userspace, even as we add new fields.
 *
 * Note this is using both struct drm_i915_query_item and struct drm_i915_query.
 * For this new query we are adding the new query id DRM_I915_QUERY_MEMORY_REGIONS
 * at &drm_i915_query_item.query_id.
 */
struct drm_i915_memory_region_info {
        /** @region: The class:instance pair encoding */
        struct drm_i915_gem_memory_class_instance region;

        /** @rsvd0: MBZ */
        __u32 rsvd0;

        /** @probed_size: Memory probed by the driver (-1 = unknown) */
        __u64 probed_size;

        /** @unallocated_size: Estimate of memory remaining (-1 = unknown) */
        __u64 unallocated_size;

        /** @rsvd1: MBZ */
        __u64 rsvd1[8];
};

/**
 * struct drm_i915_query_memory_regions
 *
 * The region info query enumerates all regions known to the driver by filling
 * in an array of struct drm_i915_memory_region_info structures.
 *
 * Example for getting the list of supported regions:
 *
 * .. code-block:: C
 *
 *      struct drm_i915_query_memory_regions *info;
 *      struct drm_i915_query_item item = {
 *              .query_id = DRM_I915_QUERY_MEMORY_REGIONS;
 *      };
 *      struct drm_i915_query query = {
 *              .num_items = 1,
 *              .items_ptr = (uintptr_t)&item,
 *      };
 *      int err, i;
 *
 *      // First query the size of the blob we need, this needs to be large
 *      // enough to hold our array of regions. The kernel will fill out the
 *      // item.length for us, which is the number of bytes we need.
 *      err = ioctl(fd, DRM_IOCTL_I915_QUERY, &query);
 *      if (err) ...
 *
 *      info = calloc(1, item.length);
 *      // Now that we allocated the required number of bytes, we call the ioctl
 *      // again, this time with the data_ptr pointing to our newly allocated
 *      // blob, which the kernel can then populate with the all the region info.
 *      item.data_ptr = (uintptr_t)&info,
 *
 *      err = ioctl(fd, DRM_IOCTL_I915_QUERY, &query);
 *      if (err) ...
 *
 *      // We can now access each region in the array
 *      for (i = 0; i < info->num_regions; i++) {
 *              struct drm_i915_memory_region_info mr = info->regions[i];
 *              u16 class = mr.region.class;
 *              u16 instance = mr.region.instance;
 *
 *              ....
 *      }
 *
 *      free(info);
 */
struct drm_i915_query_memory_regions {
        /** @num_regions: Number of supported regions */
        __u32 num_regions;

        /** @rsvd: MBZ */
        __u32 rsvd[3];

        /** @regions: Info about each supported region */
        struct drm_i915_memory_region_info regions[];
};

/**
 * struct drm_i915_gem_create_ext - Existing gem_create behaviour, with added
 * extension support using struct i915_user_extension.
 *
 * Note that in the future we want to have our buffer flags here, at least for
 * the stuff that is immutable. Previously we would have two ioctls, one to
 * create the object with gem_create, and another to apply various parameters,
 * however this creates some ambiguity for the params which are considered
 * immutable. Also in general we're phasing out the various SET/GET ioctls.
 */
struct drm_i915_gem_create_ext {
        /**
         * @size: Requested size for the object.
         *
         * The (page-aligned) allocated size for the object will be returned.
         *
         * Note that for some devices we have might have further minimum
         * page-size restrictions(larger than 4K), like for device local-memory.
         * However in general the final size here should always reflect any
         * rounding up, if for example using the I915_GEM_CREATE_EXT_MEMORY_REGIONS
         * extension to place the object in device local-memory.
         */
        __u64 size;
        /**
         * @handle: Returned handle for the object.
         *
         * Object handles are nonzero.
         */
        __u32 handle;
        /** @flags: MBZ */
        __u32 flags;
        /**
         * @extensions: The chain of extensions to apply to this object.
         *
         * This will be useful in the future when we need to support several
         * different extensions, and we need to apply more than one when
         * creating the object. See struct i915_user_extension.
         *
         * If we don't supply any extensions then we get the same old gem_create
         * behaviour.
         *
         * For I915_GEM_CREATE_EXT_MEMORY_REGIONS usage see
         * struct drm_i915_gem_create_ext_memory_regions.
         */
#define I915_GEM_CREATE_EXT_MEMORY_REGIONS 0
        __u64 extensions;
};

/**
 * struct drm_i915_gem_create_ext_memory_regions - The
 * I915_GEM_CREATE_EXT_MEMORY_REGIONS extension.
 *
 * Set the object with the desired set of placements/regions in priority
 * order. Each entry must be unique and supported by the device.
 *
 * This is provided as an array of struct drm_i915_gem_memory_class_instance, or
 * an equivalent layout of class:instance pair encodings. See struct
 * drm_i915_query_memory_regions and DRM_I915_QUERY_MEMORY_REGIONS for how to
 * query the supported regions for a device.
 *
 * As an example, on discrete devices, if we wish to set the placement as
 * device local-memory we can do something like:
 *
 * .. code-block:: C
 *
 *      struct drm_i915_gem_memory_class_instance region_lmem = {
 *              .memory_class = I915_MEMORY_CLASS_DEVICE,
 *              .memory_instance = 0,
 *      };
 *      struct drm_i915_gem_create_ext_memory_regions regions = {
 *              .base = { .name = I915_GEM_CREATE_EXT_MEMORY_REGIONS },
 *              .regions = (uintptr_t)&region_lmem,
 *              .num_regions = 1,
 *      };
 *      struct drm_i915_gem_create_ext create_ext = {
 *              .size = 16 * PAGE_SIZE,
 *              .extensions = (uintptr_t)&regions,
 *      };
 *
 *      int err = ioctl(fd, DRM_IOCTL_I915_GEM_CREATE_EXT, &create_ext);
 *      if (err) ...
 *
 * At which point we get the object handle in &drm_i915_gem_create_ext.handle,
 * along with the final object size in &drm_i915_gem_create_ext.size, which
 * should account for any rounding up, if required.
 */
struct drm_i915_gem_create_ext_memory_regions {
        /** @base: Extension link. See struct i915_user_extension. */
        struct i915_user_extension base;

        /** @pad: MBZ */
        __u32 pad;
        /** @num_regions: Number of elements in the @regions array. */
        __u32 num_regions;
        /**
         * @regions: The regions/placements array.
         *
         * An array of struct drm_i915_gem_memory_class_instance.
         */
        __u64 regions;
};

#if defined(__cplusplus)
}
#endif

#endif /* _UAPI_I915_DRM_H_ */