On Fri, 03 Jun 2022 08:55:45 -0700, John.C.Harrison@xxxxxxxxx wrote:
>
> From: John Harrison <John.C.Harrison@xxxxxxxxx>
>
> Update to the latest master version of the DRM UAPI header file from
> git://anongit.freedesktop.org/git/drm/drm:
> c4955d9cd2fc Merge tag 'drm-intel-next-fixes-2022-05-24' of
> git://anongit.freedesktop.org/drm/drm-intel into drm-next
Verified that i915_drm.h here is identical to the output of 'make
headers_install' from:
f2906aa86338 (HEAD -> drm-next, tag: v5.19-rc1, dd/drm-next) Linux 5.19-rc1
So this is:
Reviewed-by: Ashutosh Dixit <ashutosh.dixit@xxxxxxxxx>
> Signed-off-by: John Harrison <John.C.Harrison@xxxxxxxxx>
> ---
> include/drm-uapi/i915_drm.h | 398 ++++++++++++++++++++++++++++--------
> 1 file changed, 312 insertions(+), 86 deletions(-)
>
> diff --git a/include/drm-uapi/i915_drm.h b/include/drm-uapi/i915_drm.h
> index 9c9e1afa61ba..b4efc96c2edc 100644
> --- a/include/drm-uapi/i915_drm.h
> +++ b/include/drm-uapi/i915_drm.h
> @@ -154,25 +154,77 @@ enum i915_mocs_table_index {
> I915_MOCS_CACHED,
> };
>
> -/*
> +/**
> + * enum drm_i915_gem_engine_class - uapi engine type enumeration
> + *
> * 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.
> + * engine serving each role. This enum 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:
> + *
> + * Render engines support instructions used for 3D, Compute (GPGPU),
> + * and programmable media workloads. These instructions fetch data and
> + * dispatch individual work items to threads that operate in parallel.
> + * The threads run small programs (called "kernels" or "shaders") on
> + * the GPU's execution units (EUs).
> + */
> I915_ENGINE_CLASS_RENDER = 0,
> +
> + /**
> + * @I915_ENGINE_CLASS_COPY:
> + *
> + * Copy engines (also referred to as "blitters") support instructions
> + * that move blocks of data from one location in memory to another,
> + * or that fill a specified location of memory with fixed data.
> + * Copy engines can perform pre-defined logical or bitwise operations
> + * on the source, destination, or pattern data.
> + */
> I915_ENGINE_CLASS_COPY = 1,
> +
> + /**
> + * @I915_ENGINE_CLASS_VIDEO:
> + *
> + * Video engines (also referred to as "bit stream decode" (BSD) or
> + * "vdbox") support instructions that perform fixed-function media
> + * decode and encode.
> + */
> I915_ENGINE_CLASS_VIDEO = 2,
> +
> + /**
> + * @I915_ENGINE_CLASS_VIDEO_ENHANCE:
> + *
> + * Video enhancement engines (also referred to as "vebox") support
> + * instructions related to image enhancement.
> + */
> I915_ENGINE_CLASS_VIDEO_ENHANCE = 3,
>
> - /* should be kept compact */
> + /**
> + * @I915_ENGINE_CLASS_COMPUTE:
> + *
> + * Compute engines support a subset of the instructions available
> + * on render engines: compute engines support Compute (GPGPU) and
> + * programmable media workloads, but do not support the 3D pipeline.
> + */
> + I915_ENGINE_CLASS_COMPUTE = 4,
> +
> + /* Values in this enum should be kept compact. */
>
> + /**
> + * @I915_ENGINE_CLASS_INVALID:
> + *
> + * Placeholder value to represent an invalid engine class assignment.
> + */
> I915_ENGINE_CLASS_INVALID = -1
> };
>
> -/*
> +/**
> + * struct i915_engine_class_instance - Engine class/instance identifier
> + *
> * 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
> @@ -180,10 +232,21 @@ enum drm_i915_gem_engine_class {
> * for this identification.
> */
> struct i915_engine_class_instance {
> - __u16 engine_class; /* see enum drm_i915_gem_engine_class */
> - __u16 engine_instance;
> + /**
> + * @engine_class:
> + *
> + * Engine class from enum drm_i915_gem_engine_class
> + */
> + __u16 engine_class;
> #define I915_ENGINE_CLASS_INVALID_NONE -1
> #define I915_ENGINE_CLASS_INVALID_VIRTUAL -2
> +
> + /**
> + * @engine_instance:
> + *
> + * Engine instance.
> + */
> + __u16 engine_instance;
> };
>
> /**
> @@ -1118,10 +1181,16 @@ struct drm_i915_gem_exec_object2 {
> /**
> * 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.
> + *
> + * See struct drm_i915_gem_create_ext for the rules when dealing with
> + * alignment restrictions with I915_MEMORY_CLASS_DEVICE, on devices with
> + * minimum page sizes, like DG2.
> */
> __u64 offset;
>
> @@ -2651,24 +2720,65 @@ enum drm_i915_perf_record_type {
> DRM_I915_PERF_RECORD_MAX /* non-ABI */
> };
>
> -/*
> +/**
> + * struct drm_i915_perf_oa_config
> + *
> * Structure to upload perf dynamic configuration into the kernel.
> */
> struct drm_i915_perf_oa_config {
> - /** String formatted like "%08x-%04x-%04x-%04x-%012x" */
> + /**
> + * @uuid:
> + *
> + * String formatted like "%\08x-%\04x-%\04x-%\04x-%\012x"
> + */
> char uuid[36];
>
> + /**
> + * @n_mux_regs:
> + *
> + * Number of mux regs in &mux_regs_ptr.
> + */
> __u32 n_mux_regs;
> +
> + /**
> + * @n_boolean_regs:
> + *
> + * Number of boolean regs in &boolean_regs_ptr.
> + */
> __u32 n_boolean_regs;
> +
> + /**
> + * @n_flex_regs:
> + *
> + * Number of flex regs in &flex_regs_ptr.
> + */
> __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).
> + /**
> + * @mux_regs_ptr:
> + *
> + * Pointer to tuples of u32 values (register address, value) for mux
> + * registers. Expected length of buffer is (2 * sizeof(u32) *
> + * &n_mux_regs).
> */
> __u64 mux_regs_ptr;
> +
> + /**
> + * @boolean_regs_ptr:
> + *
> + * Pointer to tuples of u32 values (register address, value) for mux
> + * registers. Expected length of buffer is (2 * sizeof(u32) *
> + * &n_boolean_regs).
> + */
> __u64 boolean_regs_ptr;
> +
> + /**
> + * @flex_regs_ptr:
> + *
> + * Pointer to tuples of u32 values (register address, value) for mux
> + * registers. Expected length of buffer is (2 * sizeof(u32) *
> + * &n_flex_regs).
> + */
> __u64 flex_regs_ptr;
> };
>
> @@ -2679,12 +2789,24 @@ struct drm_i915_perf_oa_config {
> * @data_ptr is also depends on the specific @query_id.
> */
> struct drm_i915_query_item {
> - /** @query_id: The id for this query */
> + /**
> + * @query_id:
> + *
> + * The id for this query. Currently accepted query IDs are:
> + * - %DRM_I915_QUERY_TOPOLOGY_INFO (see struct drm_i915_query_topology_info)
> + * - %DRM_I915_QUERY_ENGINE_INFO (see struct drm_i915_engine_info)
> + * - %DRM_I915_QUERY_PERF_CONFIG (see struct drm_i915_query_perf_config)
> + * - %DRM_I915_QUERY_MEMORY_REGIONS (see struct drm_i915_query_memory_regions)
> + * - %DRM_I915_QUERY_HWCONFIG_BLOB (see `GuC HWCONFIG blob uAPI`)
> + * - %DRM_I915_QUERY_GEOMETRY_SUBSLICES (see struct drm_i915_query_topology_info)
> + */
> __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
> +#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
> +#define DRM_I915_QUERY_HWCONFIG_BLOB 5
> +#define DRM_I915_QUERY_GEOMETRY_SUBSLICES 6
> /* Must be kept compact -- no holes and well documented */
>
> /**
> @@ -2700,14 +2822,17 @@ struct drm_i915_query_item {
> /**
> * @flags:
> *
> - * When query_id == DRM_I915_QUERY_TOPOLOGY_INFO, must be 0.
> + * When &query_id == %DRM_I915_QUERY_TOPOLOGY_INFO, must be 0.
> *
> - * When query_id == DRM_I915_QUERY_PERF_CONFIG, must be one of the
> + * 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
> + * - %DRM_I915_QUERY_PERF_CONFIG_LIST
> + * - %DRM_I915_QUERY_PERF_CONFIG_DATA_FOR_UUID
> + * - %DRM_I915_QUERY_PERF_CONFIG_FOR_UUID
> + *
> + * When &query_id == %DRM_I915_QUERY_GEOMETRY_SUBSLICES must contain
> + * a struct i915_engine_class_instance that references a render engine.
> */
> __u32 flags;
> #define DRM_I915_QUERY_PERF_CONFIG_LIST 1
> @@ -2765,66 +2890,112 @@ struct drm_i915_query {
> __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 :
> +/**
> + * struct drm_i915_query_topology_info
> *
> - * (data[eu_offset +
> - * (X * max_subslices + Y) * eu_stride +
> - * Z / 8] >> (Z % 8)) & 1
> + * Describes slice/subslice/EU information queried by
> + * %DRM_I915_QUERY_TOPOLOGY_INFO
> */
> struct drm_i915_query_topology_info {
> - /*
> + /**
> + * @flags:
> + *
> * Unused for now. Must be cleared to zero.
> */
> __u16 flags;
>
> + /**
> + * @max_slices:
> + *
> + * The number of bits used to express the slice mask.
> + */
> __u16 max_slices;
> +
> + /**
> + * @max_subslices:
> + *
> + * The number of bits used to express the subslice mask.
> + */
> __u16 max_subslices;
> +
> + /**
> + * @max_eus_per_subslice:
> + *
> + * The number of bits in the EU mask that correspond to a single
> + * subslice's EUs.
> + */
> __u16 max_eus_per_subslice;
>
> - /*
> + /**
> + * @subslice_offset:
> + *
> * Offset in data[] at which the subslice masks are stored.
> */
> __u16 subslice_offset;
>
> - /*
> + /**
> + * @subslice_stride:
> + *
> * Stride at which each of the subslice masks for each slice are
> * stored.
> */
> __u16 subslice_stride;
>
> - /*
> + /**
> + * @eu_offset:
> + *
> * Offset in data[] at which the EU masks are stored.
> */
> __u16 eu_offset;
>
> - /*
> + /**
> + * @eu_stride:
> + *
> * Stride at which each of the EU masks for each subslice are stored.
> */
> __u16 eu_stride;
>
> + /**
> + * @data:
> + *
> + * Contains 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 :
> + *
> + * .. code:: c
> + *
> + * (data[X / 8] >> (X % 8)) & 1
> + *
> + * Starting with Xe_HP platforms, Intel hardware no longer has
> + * traditional slices so i915 will always report a single slice
> + * (hardcoded slicemask = 0x1) which contains all of the platform's
> + * subslices. I.e., the mask here does not reflect any of the newer
> + * hardware concepts such as "gslices" or "cslices" since userspace
> + * is capable of inferring those from the subslice mask.
> + *
> + * - The subslice mask for each slice with one bit per subslice telling
> + * whether a subslice is available. Starting with Gen12 we use the
> + * term "subslice" to refer to what the hardware documentation
> + * describes as a "dual-subslices." The availability of subslice Y
> + * in slice X can be queried with the following formula :
> + *
> + * .. code:: c
> + *
> + * (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 :
> + *
> + * .. code:: c
> + *
> + * (data[eu_offset +
> + * (X * max_subslices + Y) * eu_stride +
> + * Z / 8
> + * ] >> (Z % 8)) & 1
> + */
> __u8 data[];
> };
>
> @@ -2945,52 +3116,68 @@ struct drm_i915_query_engine_info {
> struct drm_i915_engine_info engines[];
> };
>
> -/*
> - * Data written by the kernel with query DRM_I915_QUERY_PERF_CONFIG.
> +/**
> + * struct drm_i915_query_perf_config
> + *
> + * Data written by the kernel with query %DRM_I915_QUERY_PERF_CONFIG and
> + * %DRM_I915_QUERY_GEOMETRY_SUBSLICES.
> */
> 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.
> + /**
> + * @n_configs:
> + *
> + * When &drm_i915_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.
> + /**
> + * @config:
> + *
> + * When &drm_i915_query_item.flags ==
> + * %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.
> + /**
> + * @uuid:
> + *
> + * When &drm_i915_query_item.flags ==
> + * %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];
> };
>
> - /*
> + /**
> + * @flags:
> + *
> * 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.
> + /**
> + * @data:
> *
> - * 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
> + * When &drm_i915_query_item.flags == %DRM_I915_QUERY_PERF_CONFIG_LIST,
> + * i915 will write an array of __u64 of configuration identifiers.
> + *
> + * When &drm_i915_query_item.flags == %DRM_I915_QUERY_PERF_CONFIG_DATA,
> + * i915 will write a struct drm_i915_perf_oa_config. If the following
> + * fields of struct drm_i915_perf_oa_config are 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
> + * - &drm_i915_perf_oa_config.n_mux_regs
> + * - &drm_i915_perf_oa_config.n_boolean_regs
> + * - &drm_i915_perf_oa_config.n_flex_regs
> */
> __u8 data[];
> };
> @@ -3128,6 +3315,16 @@ struct drm_i915_query_memory_regions {
> struct drm_i915_memory_region_info regions[];
> };
>
> +/**
> + * DOC: GuC HWCONFIG blob uAPI
> + *
> + * The GuC produces a blob with information about the current device.
> + * i915 reads this blob from GuC and makes it available via this uAPI.
> + *
> + * The format and meaning of the blob content are documented in the
> + * Programmer's Reference Manual.
> + */
> +
> /**
> * struct drm_i915_gem_create_ext - Existing gem_create behaviour, with added
> * extension support using struct i915_user_extension.
> @@ -3144,11 +3341,40 @@ struct drm_i915_gem_create_ext {
> *
> * 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.
> + *
> + * DG2 64K min page size implications:
> + *
> + * On discrete platforms, starting from DG2, we have to contend with GTT
> + * page size restrictions when dealing with I915_MEMORY_CLASS_DEVICE
> + * objects. Specifically the hardware only supports 64K or larger GTT
> + * page sizes for such memory. The kernel will already ensure that all
> + * I915_MEMORY_CLASS_DEVICE memory is allocated using 64K or larger page
> + * sizes underneath.
> + *
> + * Note that the returned size here will always reflect any required
> + * rounding up done by the kernel, i.e 4K will now become 64K on devices
> + * such as DG2.
> + *
> + * Special DG2 GTT address alignment requirement:
> + *
> + * The GTT alignment will also need to be at least 2M for such objects.
> + *
> + * Note that due to how the hardware implements 64K GTT page support, we
> + * have some further complications:
> + *
> + * 1) The entire PDE (which covers a 2MB virtual address range), must
> + * contain only 64K PTEs, i.e mixing 4K and 64K PTEs in the same
> + * PDE is forbidden by the hardware.
> + *
> + * 2) We still need to support 4K PTEs for I915_MEMORY_CLASS_SYSTEM
> + * objects.
> + *
> + * To keep things simple for userland, we mandate that any GTT mappings
> + * must be aligned to and rounded up to 2MB. The kernel will internally
> + * pad them out to the next 2MB boundary. As this only wastes virtual
> + * address space and avoids userland having to copy any needlessly
> + * complicated PDE sharing scheme (coloring) and only affects DG2, this
> + * is deemed to be a good compromise.
> */
> __u64 size;
> /**
> --
> 2.36.0
>
