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/* SPDX-License-Identifier: MIT */ /* * Copyright (C) The Asahi Linux Contributors * Copyright (C) 2018-2023 Collabora Ltd. * Copyright (C) 2014-2018 Broadcom */ #ifndef _ASAHI_DRM_H_ #define _ASAHI_DRM_H_ #include "drm.h" #if defined(__cplusplus) extern "C" { #endif /** * DOC: Introduction to the Asahi UAPI * * This documentation describes the Asahi IOCTLs. * * Just a few generic rules about the data passed to the Asahi IOCTLs (cribbed * from Panthor): * * - Structures must be aligned on 64-bit/8-byte. If the object is not * naturally aligned, a padding field must be added. * - Fields must be explicitly aligned to their natural type alignment with * pad[0..N] fields. * - All padding fields will be checked by the driver to make sure they are * zeroed. * - Flags can be added, but not removed/replaced. * - New fields can be added to the main structures (the structures * directly passed to the ioctl). Those fields can be added at the end of * the structure, or replace existing padding fields. Any new field being * added must preserve the behavior that existed before those fields were * added when a value of zero is passed. * - New fields can be added to indirect objects (objects pointed by the * main structure), iff those objects are passed a size to reflect the * size known by the userspace driver (see * drm_asahi_cmd_header::size). * - If the kernel driver is too old to know some fields, those will be * ignored if zero, and otherwise rejected (and so will be zero on output). * - If userspace is too old to know some fields, those will be zeroed * (input) before the structure is parsed by the kernel driver. * - Each new flag/field addition must come with a driver version update so * the userspace driver doesn't have to guess which flags are supported. * - Structures should not contain unions, as this would defeat the * extensibility of such structures. * - IOCTLs can't be removed or replaced. New IOCTL IDs should be placed * at the end of the drm_asahi_ioctl_id enum. */ /** * enum drm_asahi_ioctl_id - IOCTL IDs * * Place new ioctls at the end, don't re-order, don't replace or remove entries. * * These IDs are not meant to be used directly. Use the DRM_IOCTL_ASAHI_xxx * definitions instead. */ enum drm_asahi_ioctl_id { /** @DRM_ASAHI_GET_PARAMS: Query device properties. */ DRM_ASAHI_GET_PARAMS = 0, /** @DRM_ASAHI_GET_TIME: Query device time. */ DRM_ASAHI_GET_TIME, /** @DRM_ASAHI_VM_CREATE: Create a GPU VM address space. */ DRM_ASAHI_VM_CREATE, /** @DRM_ASAHI_VM_DESTROY: Destroy a VM. */ DRM_ASAHI_VM_DESTROY, /** @DRM_ASAHI_VM_BIND: Bind/unbind memory to a VM. */ DRM_ASAHI_VM_BIND, /** @DRM_ASAHI_GEM_CREATE: Create a buffer object. */ DRM_ASAHI_GEM_CREATE, /** * @DRM_ASAHI_GEM_MMAP_OFFSET: Get offset to pass to mmap() to map a * given GEM handle. */ DRM_ASAHI_GEM_MMAP_OFFSET, /** @DRM_ASAHI_GEM_BIND_OBJECT: Bind memory as a special object */ DRM_ASAHI_GEM_BIND_OBJECT, /** @DRM_ASAHI_QUEUE_CREATE: Create a scheduling queue. */ DRM_ASAHI_QUEUE_CREATE, /** @DRM_ASAHI_QUEUE_DESTROY: Destroy a scheduling queue. */ DRM_ASAHI_QUEUE_DESTROY, /** @DRM_ASAHI_SUBMIT: Submit commands to a queue. */ DRM_ASAHI_SUBMIT, }; #define DRM_ASAHI_MAX_CLUSTERS 64 /** * struct drm_asahi_params_global - Global parameters. * * This struct may be queried by drm_asahi_get_params. */ struct drm_asahi_params_global { /** @features: Feature bits from drm_asahi_feature */ __u64 features; /** @gpu_generation: GPU generation, e.g. 13 for G13G */ __u32 gpu_generation; /** @gpu_variant: GPU variant as a character, e.g. 'C' for G13C */ __u32 gpu_variant; /** * @gpu_revision: GPU revision in BCD, e.g. 0x00 for 'A0' or * 0x21 for 'C1' */ __u32 gpu_revision; /** @chip_id: Chip ID in BCD, e.g. 0x8103 for T8103 */ __u32 chip_id; /** @num_dies: Number of dies in the SoC */ __u32 num_dies; /** @num_clusters_total: Number of GPU clusters (across all dies) */ __u32 num_clusters_total; /** * @num_cores_per_cluster: Number of logical cores per cluster * (including inactive/nonexistent) */ __u32 num_cores_per_cluster; /** @max_frequency_khz: Maximum GPU core clock frequency */ __u32 max_frequency_khz; /** @core_masks: Bitmask of present/enabled cores per cluster */ __u64 core_masks[DRM_ASAHI_MAX_CLUSTERS]; /** * @vm_start: VM range start VMA. Together with @vm_end, this defines * the window of valid GPU VAs. Userspace is expected to subdivide VAs * out of this window. * * This window contains all virtual addresses that userspace needs to * know about. There may be kernel-internal GPU VAs outside this range, * but that detail is not relevant here. */ __u64 vm_start; /** @vm_end: VM range end VMA */ __u64 vm_end; /** * @vm_kernel_min_size: Minimum kernel VMA window size. * * When creating a VM, userspace is required to carve out a section of * virtual addresses (within the range given by @vm_start and * @vm_end). The kernel will allocate various internal structures * within the specified VA range. * * Allowing userspace to choose the VA range for the kernel, rather than * the kernel reserving VAs and requiring userspace to cope, can assist * in implementing SVM. */ __u64 vm_kernel_min_size; /** * @max_commands_per_submission: Maximum number of supported commands * per submission. This mirrors firmware limits. Userspace must split up * larger command buffers, which may require inserting additional * synchronization. */ __u32 max_commands_per_submission; /** * @max_attachments: Maximum number of drm_asahi_attachment's per * command */ __u32 max_attachments; /** * @command_timestamp_frequency_hz: Timebase frequency for timestamps * written during command execution, specified via drm_asahi_timestamp * structures. As this rate is controlled by the firmware, it is a * queryable parameter. * * Userspace must divide by this frequency to convert timestamps to * seconds, rather than hardcoding a particular firmware's rate. */ __u64 command_timestamp_frequency_hz; }; /** * enum drm_asahi_feature - Feature bits * * This covers only features that userspace cannot infer from the architecture * version. Most features don't need to be here. */ enum drm_asahi_feature { /** * @DRM_ASAHI_FEATURE_SOFT_FAULTS: GPU has "soft fault" enabled. Shader * loads of unmapped memory will return zero. Shader stores to unmapped * memory will be silently discarded. Note that only shader load/store * is affected. Other hardware units are not affected, notably including * texture sampling. * * Soft fault is set when initializing the GPU and cannot be runtime * toggled. Therefore, it is exposed as a feature bit and not a * userspace-settable flag on the VM. When soft fault is enabled, * userspace can speculate memory accesses more aggressively. */ DRM_ASAHI_FEATURE_SOFT_FAULTS = (1UL) << 0, }; /** * struct drm_asahi_get_params - Arguments passed to DRM_IOCTL_ASAHI_GET_PARAMS */ struct drm_asahi_get_params { /** @param_group: Parameter group to fetch (MBZ) */ __u32 param_group; /** @pad: MBZ */ __u32 pad; /** @pointer: User pointer to write parameter struct */ __u64 pointer; /** * @size: Size of the user buffer. In case of older userspace, this may * be less than sizeof(struct drm_asahi_params_global). The kernel will * not write past the length specified here, allowing extensibility. */ __u64 size; }; /** * struct drm_asahi_vm_create - Arguments passed to DRM_IOCTL_ASAHI_VM_CREATE */ struct drm_asahi_vm_create { /** * @kernel_start: Start of the kernel-reserved address range. See * drm_asahi_params_global::vm_kernel_min_size. * * Both @kernel_start and @kernel_end must be within the range of * valid VAs given by drm_asahi_params_global::vm_start and * drm_asahi_params_global::vm_end. The size of the kernel range * (@kernel_end - @kernel_start) must be at least * drm_asahi_params_global::vm_kernel_min_size. * * Userspace must not bind any memory on this VM into this reserved * range, it is for kernel use only. */ __u64 kernel_start; /** * @kernel_end: End of the kernel-reserved address range. See * @kernel_start. */ __u64 kernel_end; /** @vm_id: Returned VM ID */ __u32 vm_id; /** @pad: MBZ */ __u32 pad; }; /** * struct drm_asahi_vm_destroy - Arguments passed to DRM_IOCTL_ASAHI_VM_DESTROY */ struct drm_asahi_vm_destroy { /** @vm_id: VM ID to be destroyed */ __u32 vm_id; /** @pad: MBZ */ __u32 pad; }; /** * enum drm_asahi_gem_flags - Flags for GEM creation */ enum drm_asahi_gem_flags { /** * @DRM_ASAHI_GEM_WRITEBACK: BO should be CPU-mapped as writeback. * * Map as writeback instead of write-combine. This optimizes for CPU * reads. */ DRM_ASAHI_GEM_WRITEBACK = (1L << 0), /** * @DRM_ASAHI_GEM_VM_PRIVATE: BO is private to this GPU VM (no exports). */ DRM_ASAHI_GEM_VM_PRIVATE = (1L << 1), }; /** * struct drm_asahi_gem_create - Arguments passed to DRM_IOCTL_ASAHI_GEM_CREATE */ struct drm_asahi_gem_create { /** @size: Size of the BO */ __u64 size; /** @flags: Combination of drm_asahi_gem_flags flags. */ __u32 flags; /** * @vm_id: VM ID to assign to the BO, if DRM_ASAHI_GEM_VM_PRIVATE is set */ __u32 vm_id; /** @handle: Returned GEM handle for the BO */ __u32 handle; /** @pad: MBZ */ __u32 pad; }; /** * struct drm_asahi_gem_mmap_offset - Arguments passed to * DRM_IOCTL_ASAHI_GEM_MMAP_OFFSET */ struct drm_asahi_gem_mmap_offset { /** @handle: Handle for the object being mapped. */ __u32 handle; /** @flags: Must be zero */ __u32 flags; /** @offset: The fake offset to use for subsequent mmap call */ __u64 offset; }; /** * enum drm_asahi_bind_flags - Flags for GEM binding */ enum drm_asahi_bind_flags { /** * @DRM_ASAHI_BIND_UNBIND: Instead of binding a GEM object to the range, * simply unbind the GPU VMA range. */ DRM_ASAHI_BIND_UNBIND = (1L << 0), /** @DRM_ASAHI_BIND_READ: Map BO with GPU read permission */ DRM_ASAHI_BIND_READ = (1L << 1), /** @DRM_ASAHI_BIND_WRITE: Map BO with GPU write permission */ DRM_ASAHI_BIND_WRITE = (1L << 2), /** * @DRM_ASAHI_BIND_SINGLE_PAGE: Map a single page of the BO repeatedly * across the VA range. * * This is useful to fill a VA range with scratch pages or zero pages. * It is intended as a mechanism to accelerate sparse. */ DRM_ASAHI_BIND_SINGLE_PAGE = (1L << 3), }; /** * struct drm_asahi_gem_bind_op - Description of a single GEM bind operation. */ struct drm_asahi_gem_bind_op { /** @flags: Combination of drm_asahi_bind_flags flags. */ __u32 flags; /** @handle: GEM object to bind (except for UNBIND) */ __u32 handle; /** * @offset: Offset into the object (except for UNBIND). * * For a regular bind, this is the beginning of the region of the GEM * object to bind. * * For a single-page bind, this is the offset to the single page that * will be repeatedly bound. * * Must be page-size aligned. */ __u64 offset; /** * @range: Number of bytes to bind/unbind to @addr. * * Must be page-size aligned. */ __u64 range; /** * @addr: Address to bind to. * * Must be page-size aligned. */ __u64 addr; }; /** * struct drm_asahi_vm_bind - Arguments passed to * DRM_IOCTL_ASAHI_VM_BIND */ struct drm_asahi_vm_bind { /** @vm_id: The ID of the VM to bind to */ __u32 vm_id; /** @num_binds: number of binds in this IOCTL. */ __u32 num_binds; /** * @stride: Stride in bytes between consecutive binds. This allows * extensibility of drm_asahi_gem_bind_op. */ __u32 stride; /** @pad: MBZ */ __u32 pad; /** * @userptr: User pointer to an array of @num_binds structures of type * @drm_asahi_gem_bind_op and size @stride bytes. */ __u64 userptr; }; /** * enum drm_asahi_bind_object_op - Special object bind operation */ enum drm_asahi_bind_object_op { /** @DRM_ASAHI_BIND_OBJECT_OP_BIND: Bind a BO as a special GPU object */ DRM_ASAHI_BIND_OBJECT_OP_BIND = 0, /** @DRM_ASAHI_BIND_OBJECT_OP_UNBIND: Unbind a special GPU object */ DRM_ASAHI_BIND_OBJECT_OP_UNBIND = 1, }; /** * enum drm_asahi_bind_object_flags - Special object bind flags */ enum drm_asahi_bind_object_flags { /** * @DRM_ASAHI_BIND_OBJECT_USAGE_TIMESTAMPS: Map a BO as a timestamp * buffer. */ DRM_ASAHI_BIND_OBJECT_USAGE_TIMESTAMPS = (1L << 0), }; /** * struct drm_asahi_gem_bind_object - Arguments passed to * DRM_IOCTL_ASAHI_GEM_BIND_OBJECT */ struct drm_asahi_gem_bind_object { /** @op: Bind operation (enum drm_asahi_bind_object_op) */ __u32 op; /** @flags: Combination of drm_asahi_bind_object_flags flags. */ __u32 flags; /** @handle: GEM object to bind/unbind (BIND) */ __u32 handle; /** @vm_id: The ID of the VM to operate on (MBZ currently) */ __u32 vm_id; /** @offset: Offset into the object (BIND only) */ __u64 offset; /** @range: Number of bytes to bind/unbind (BIND only) */ __u64 range; /** @object_handle: Object handle (out for BIND, in for UNBIND) */ __u32 object_handle; /** @pad: MBZ */ __u32 pad; }; /** * enum drm_asahi_cmd_type - Command type */ enum drm_asahi_cmd_type { /** * @DRM_ASAHI_CMD_RENDER: Render command, executing on the render * subqueue. Combined vertex and fragment operation. * * Followed by a @drm_asahi_cmd_render payload. */ DRM_ASAHI_CMD_RENDER = 0, /** * @DRM_ASAHI_CMD_COMPUTE: Compute command on the compute subqueue. * * Followed by a @drm_asahi_cmd_compute payload. */ DRM_ASAHI_CMD_COMPUTE = 1, /** * @DRM_ASAHI_SET_VERTEX_ATTACHMENTS: Software command to set * attachments for subsequent vertex shaders in the same submit. * * Followed by (possibly multiple) @drm_asahi_attachment payloads. */ DRM_ASAHI_SET_VERTEX_ATTACHMENTS = 2, /** * @DRM_ASAHI_SET_FRAGMENT_ATTACHMENTS: Software command to set * attachments for subsequent fragment shaders in the same submit. * * Followed by (possibly multiple) @drm_asahi_attachment payloads. */ DRM_ASAHI_SET_FRAGMENT_ATTACHMENTS = 3, /** * @DRM_ASAHI_SET_COMPUTE_ATTACHMENTS: Software command to set * attachments for subsequent compute shaders in the same submit. * * Followed by (possibly multiple) @drm_asahi_attachment payloads. */ DRM_ASAHI_SET_COMPUTE_ATTACHMENTS = 4, }; /** * enum drm_asahi_priority - Scheduling queue priority. * * These priorities are forwarded to the firmware to influence firmware * scheduling. The exact policy is ultimately decided by firmware, but * these enums allow userspace to communicate the intentions. */ enum drm_asahi_priority { /** @DRM_ASAHI_PRIORITY_LOW: Low priority queue. */ DRM_ASAHI_PRIORITY_LOW = 0, /** @DRM_ASAHI_PRIORITY_MEDIUM: Medium priority queue. */ DRM_ASAHI_PRIORITY_MEDIUM = 1, /** * @DRM_ASAHI_PRIORITY_HIGH: High priority queue. * * Reserved for future extension. */ DRM_ASAHI_PRIORITY_HIGH = 2, /** * @DRM_ASAHI_PRIORITY_REALTIME: Real-time priority queue. * * Reserved for future extension. */ DRM_ASAHI_PRIORITY_REALTIME = 3, }; /** * struct drm_asahi_queue_create - Arguments passed to * DRM_IOCTL_ASAHI_QUEUE_CREATE */ struct drm_asahi_queue_create { /** @flags: MBZ */ __u32 flags; /** @vm_id: The ID of the VM this queue is bound to */ __u32 vm_id; /** @priority: One of drm_asahi_priority */ __u32 priority; /** @queue_id: The returned queue ID */ __u32 queue_id; /** * @usc_exec_base: GPU base address for all USC binaries (shaders) on * this queue. USC addresses are 32-bit relative to this 64-bit base. * * This sets the following registers on all queue commands: * * USC_EXEC_BASE_TA (vertex) * USC_EXEC_BASE_ISP (fragment) * USC_EXEC_BASE_CP (compute) * * While the hardware lets us configure these independently per command, * we do not have a use case for this. Instead, we expect userspace to * fix a 4GiB VA carveout for USC memory and pass its base address here. */ __u64 usc_exec_base; }; /** * struct drm_asahi_queue_destroy - Arguments passed to * DRM_IOCTL_ASAHI_QUEUE_DESTROY */ struct drm_asahi_queue_destroy { /** @queue_id: The queue ID to be destroyed */ __u32 queue_id; /** @pad: MBZ */ __u32 pad; }; /** * enum drm_asahi_sync_type - Sync item type */ enum drm_asahi_sync_type { /** @DRM_ASAHI_SYNC_SYNCOBJ: Binary sync object */ DRM_ASAHI_SYNC_SYNCOBJ = 0, /** @DRM_ASAHI_SYNC_TIMELINE_SYNCOBJ: Timeline sync object */ DRM_ASAHI_SYNC_TIMELINE_SYNCOBJ = 1, }; /** * struct drm_asahi_sync - Sync item */ struct drm_asahi_sync { /** @sync_type: One of drm_asahi_sync_type */ __u32 sync_type; /** @handle: The sync object handle */ __u32 handle; /** @timeline_value: Timeline value for timeline sync objects */ __u64 timeline_value; }; /** * define DRM_ASAHI_BARRIER_NONE - Command index for no barrier * * This special value may be passed in to drm_asahi_command::vdm_barrier or * drm_asahi_command::cdm_barrier to indicate that the respective subqueue * should not wait on any previous work. */ #define DRM_ASAHI_BARRIER_NONE (0xFFFFu) /** * struct drm_asahi_cmd_header - Top level command structure * * This struct is core to the command buffer definition and therefore is not * extensible. */ struct drm_asahi_cmd_header { /** @cmd_type: One of drm_asahi_cmd_type */ __u16 cmd_type; /** * @size: Size of this command, not including this header. * * For hardware commands, this enables extensibility of commands without * requiring extra command types. Passing a command that is shorter * than expected is explicitly allowed for backwards-compatibility. * Truncated fields will be zeroed. * * For the synthetic attachment setting commands, this implicitly * encodes the number of attachments. These commands take multiple * fixed-size @drm_asahi_attachment structures as their payload, so size * equals number of attachments * sizeof(struct drm_asahi_attachment). */ __u16 size; /** * @vdm_barrier: VDM (render) command index to wait on. * * Barriers are indices relative to the beginning of a given submit. A * barrier of 0 waits on commands submitted to the respective subqueue * in previous submit ioctls. A barrier of N waits on N previous * commands on the subqueue within the current submit ioctl. As a * special case, passing @DRM_ASAHI_BARRIER_NONE avoids waiting on any * commands in the subqueue. * * Examples: * * 0: This waits on all previous work. * * NONE: This does not wait for anything on this subqueue. * * 1: This waits on the first render command in the submit. * This is valid only if there are multiple render commands in the * same submit. * * Barriers are valid only for hardware commands. Synthetic software * commands to set attachments must pass NONE here. */ __u16 vdm_barrier; /** * @cdm_barrier: CDM (compute) command index to wait on. * * See @vdm_barrier, and replace VDM/render with CDM/compute. */ __u16 cdm_barrier; }; /** * struct drm_asahi_submit - Arguments passed to DRM_IOCTL_ASAHI_SUBMIT */ struct drm_asahi_submit { /** * @syncs: An optional pointer to an array of drm_asahi_sync. The first * @in_sync_count elements are in-syncs, then the remaining * @out_sync_count elements are out-syncs. Using a single array with * explicit partitioning simplifies handling. */ __u64 syncs; /** * @cmdbuf: Pointer to the command buffer to submit. * * This is a flat command buffer. By design, it contains no CPU * pointers, which makes it suitable for a virtgpu wire protocol without * requiring any serializing/deserializing step. * * It consists of a series of commands. Each command begins with a * fixed-size @drm_asahi_cmd_header header and is followed by a * variable-length payload according to the type and size in the header. * * The combined count of "real" hardware commands must be nonzero and at * most drm_asahi_params_global::max_commands_per_submission. */ __u64 cmdbuf; /** @flags: Flags for command submission (MBZ) */ __u32 flags; /** @queue_id: The queue ID to be submitted to */ __u32 queue_id; /** * @in_sync_count: Number of sync objects to wait on before starting * this job. */ __u32 in_sync_count; /** * @out_sync_count: Number of sync objects to signal upon completion of * this job. */ __u32 out_sync_count; /** @cmdbuf_size: Command buffer size in bytes */ __u32 cmdbuf_size; /** @pad: MBZ */ __u32 pad; }; /** * struct drm_asahi_attachment - Describe an "attachment". * * Attachments are any memory written by shaders, notably including render * target attachments written by the end-of-tile program. This is purely a hint * about the accessed memory regions. It is optional to specify, which is * fortunate as it cannot be specified precisely with bindless access anyway. * But where possible, it's probably a good idea for userspace to include these * hints, forwarded to the firmware. * * This struct is implicitly sized and therefore is not extensible. */ struct drm_asahi_attachment { /** @pointer: Base address of the attachment */ __u64 pointer; /** @size: Size of the attachment in bytes */ __u64 size; /** @pad: MBZ */ __u32 pad; /** @flags: MBZ */ __u32 flags; }; enum drm_asahi_render_flags { /** * @DRM_ASAHI_RENDER_VERTEX_SCRATCH: A vertex stage shader uses scratch * memory. */ DRM_ASAHI_RENDER_VERTEX_SCRATCH = (1U << 0), /** * @DRM_ASAHI_RENDER_PROCESS_EMPTY_TILES: Process even empty tiles. * This must be set when clearing render targets. */ DRM_ASAHI_RENDER_PROCESS_EMPTY_TILES = (1U << 1), /** * @DRM_ASAHI_RENDER_NO_VERTEX_CLUSTERING: Run vertex stage on a single * cluster (on multi-cluster GPUs) * * This harms performance but can workaround certain sync/coherency * bugs, and therefore is useful for debugging. */ DRM_ASAHI_RENDER_NO_VERTEX_CLUSTERING = (1U << 2), /** * @DRM_ASAHI_RENDER_DBIAS_IS_INT: Use integer depth bias formula. * * Graphics specifications contain two alternate formulas for depth * bias, a float formula used with floating-point depth buffers and an * integer formula using with unorm depth buffers. This flag specifies * that the integer formula should be used. If omitted, the float * formula is used instead. * * This corresponds to bit 18 of the relevant hardware control register, * so we match that here for efficiency. */ DRM_ASAHI_RENDER_DBIAS_IS_INT = (1U << 18), }; /** * struct drm_asahi_zls_buffer - Describe a depth or stencil buffer. * * These fields correspond to hardware registers in the ZLS (Z Load/Store) unit. * There are three hardware registers for each field respectively for loads, * stores, and partial renders. In practice, it makes sense to set all to the * same values, except in exceptional cases not yet implemented in userspace, so * we do not duplicate here for simplicity/efficiency. * * This struct is embedded in other structs and therefore is not extensible. */ struct drm_asahi_zls_buffer { /** @base: Base address of the buffer */ __u64 base; /** * @comp_base: If the load buffer is compressed, address of the * compression metadata section. */ __u64 comp_base; /** * @stride: If layered rendering is enabled, the number of bytes * between each layer of the buffer. */ __u32 stride; /** * @comp_stride: If layered rendering is enabled, the number of bytes * between each layer of the compression metadata. */ __u32 comp_stride; }; /** * struct drm_asahi_timestamp - Describe a timestamp write. * * The firmware can optionally write the GPU timestamp at render pass * granularities, but it needs to be mapped specially via * DRM_IOCTL_ASAHI_GEM_BIND_OBJECT. This structure therefore describes where to * write as a handle-offset pair, rather than a GPU address like normal. * * This struct is embedded in other structs and therefore is not extensible. */ struct drm_asahi_timestamp { /** * @handle: Handle of the timestamp buffer, or 0 to skip this * timestamp. If nonzero, this must equal the value returned in * drm_asahi_gem_bind_object::object_handle. */ __u32 handle; /** @offset: Offset to write into the timestamp buffer */ __u32 offset; }; /** * struct drm_asahi_timestamps - Describe timestamp writes. * * Each operation that can be timestamped, can be timestamped at the start and * end. Therefore, drm_asahi_timestamp structs always come in pairs, bundled * together into drm_asahi_timestamps. * * This struct is embedded in other structs and therefore is not extensible. */ struct drm_asahi_timestamps { /** @start: Timestamp recorded at the start of the operation */ struct drm_asahi_timestamp start; /** @end: Timestamp recorded at the end of the operation */ struct drm_asahi_timestamp end; }; /** * struct drm_asahi_helper_program - Describe helper program configuration. * * The helper program is a compute-like kernel required for various hardware * functionality. Its most important role is dynamically allocating * scratch/stack memory for individual subgroups, by partitioning a static * allocation shared for the whole device. It is supplied by userspace via * drm_asahi_helper_program and internally dispatched by the hardware as needed. * * This struct is embedded in other structs and therefore is not extensible. */ struct drm_asahi_helper_program { /** * @binary: USC address to the helper program binary. This is a tagged * pointer with configuration in the bottom bits. */ __u32 binary; /** @cfg: Additional configuration bits for the helper program. */ __u32 cfg; /** * @data: Data passed to the helper program. This value is not * interpreted by the kernel, firmware, or hardware in any way. It is * simply a sideband for userspace, set with the submit ioctl and read * via special registers inside the helper program. * * In practice, userspace will pass a 64-bit GPU VA here pointing to the * actual arguments, which presumably don't fit in 64-bits. */ __u64 data; }; /** * struct drm_asahi_bg_eot - Describe a background or end-of-tile program. * * The background and end-of-tile programs are dispatched by the hardware at the * beginning and end of rendering. As the hardware "tilebuffer" is simply local * memory, these programs are necessary to implement API-level render targets. * The fragment-like background program is responsible for loading either the * clear colour or the existing render target contents, while the compute-like * end-of-tile program stores the tilebuffer contents to memory. * * This struct is embedded in other structs and therefore is not extensible. */ struct drm_asahi_bg_eot { /** * @usc: USC address of the hardware USC words binding resources * (including images and uniforms) and the program itself. Note this is * an additional layer of indirection compared to the helper program, * avoiding the need for a sideband for data. This is a tagged pointer * with additional configuration in the bottom bits. */ __u32 usc; /** * @rsrc_spec: Resource specifier for the program. This is a packed * hardware data structure describing the required number of registers, * uniforms, bound textures, and bound samplers. */ __u32 rsrc_spec; }; /** * struct drm_asahi_cmd_render - Command to submit 3D * * This command submits a single render pass. The hardware control stream may * include many draws and subpasses, but within the command, the framebuffer * dimensions and attachments are fixed. * * The hardware requires the firmware to set a large number of Control Registers * setting up state at render pass granularity before each command rendering 3D. * The firmware bundles this state into data structures. Unfortunately, we * cannot expose either any of that directly to userspace, because the * kernel-firmware ABI is not stable. Although we can guarantee the firmware * updates in tandem with the kernel, we cannot break old userspace when * upgrading the firmware and kernel. Therefore, we need to abstract well the * data structures to avoid tying our hands with future firmwares. * * The bulk of drm_asahi_cmd_render therefore consists of values of hardware * control registers, marshalled via the firmware interface. * * The framebuffer/tilebuffer dimensions are also specified here. In addition to * being passed to the firmware/hardware, the kernel requires these dimensions * to calculate various essential tiling-related data structures. It is * unfortunate that our submits are heavier than on vendors with saner * hardware-software interfaces. The upshot is all of this information is * readily available to userspace with all current APIs. * * It looks odd - but it's not overly burdensome and it ensures we can remain * compatible with old userspace. */ struct drm_asahi_cmd_render { /** @flags: Combination of drm_asahi_render_flags flags. */ __u32 flags; /** * @isp_zls_pixels: ISP_ZLS_PIXELS register value. This contains the * depth/stencil width/height, which may differ from the framebuffer * width/height. */ __u32 isp_zls_pixels; /** * @vdm_ctrl_stream_base: VDM_CTRL_STREAM_BASE register value. GPU * address to the beginning of the VDM control stream. */ __u64 vdm_ctrl_stream_base; /** @vertex_helper: Helper program used for the vertex shader */ struct drm_asahi_helper_program vertex_helper; /** @fragment_helper: Helper program used for the fragment shader */ struct drm_asahi_helper_program fragment_helper; /** * @isp_scissor_base: ISP_SCISSOR_BASE register value. GPU address of an * array of scissor descriptors indexed in the render pass. */ __u64 isp_scissor_base; /** * @isp_dbias_base: ISP_DBIAS_BASE register value. GPU address of an * array of depth bias values indexed in the render pass. */ __u64 isp_dbias_base; /** * @isp_oclqry_base: ISP_OCLQRY_BASE register value. GPU address of an * array of occlusion query results written by the render pass. */ __u64 isp_oclqry_base; /** @depth: Depth buffer */ struct drm_asahi_zls_buffer depth; /** @stencil: Stencil buffer */ struct drm_asahi_zls_buffer stencil; /** @zls_ctrl: ZLS_CTRL register value */ __u64 zls_ctrl; /** @ppp_multisamplectl: PPP_MULTISAMPLECTL register value */ __u64 ppp_multisamplectl; /** * @sampler_heap: Base address of the sampler heap. This heap is used * for both vertex shaders and fragment shaders. The registers are * per-stage, but there is no known use case for separate heaps. */ __u64 sampler_heap; /** @ppp_ctrl: PPP_CTRL register value */ __u32 ppp_ctrl; /** @width_px: Framebuffer width in pixels */ __u16 width_px; /** @height_px: Framebuffer height in pixels */ __u16 height_px; /** @layers: Number of layers in the framebuffer */ __u16 layers; /** @sampler_count: Number of samplers in the sampler heap. */ __u16 sampler_count; /** @utile_width_px: Width of a logical tilebuffer tile in pixels */ __u8 utile_width_px; /** @utile_height_px: Height of a logical tilebuffer tile in pixels */ __u8 utile_height_px; /** @samples: # of samples in the framebuffer. Must be 1, 2, or 4. */ __u8 samples; /** @sample_size_B: # of bytes in the tilebuffer required per sample. */ __u8 sample_size_B; /** * @isp_merge_upper_x: 32-bit float used in the hardware triangle * merging. Calculate as: tan(60 deg) * width. * * Making these values UAPI avoids requiring floating-point calculations * in the kernel in the hot path. */ __u32 isp_merge_upper_x; /** * @isp_merge_upper_y: 32-bit float. Calculate as: tan(60 deg) * height. * See @isp_merge_upper_x. */ __u32 isp_merge_upper_y; /** @bg: Background program run for each tile at the start */ struct drm_asahi_bg_eot bg; /** @eot: End-of-tile program ran for each tile at the end */ struct drm_asahi_bg_eot eot; /** * @partial_bg: Background program ran at the start of each tile when * resuming the render pass during a partial render. */ struct drm_asahi_bg_eot partial_bg; /** * @partial_eot: End-of-tile program ran at the end of each tile when * pausing the render pass during a partial render. */ struct drm_asahi_bg_eot partial_eot; /** * @isp_bgobjdepth: ISP_BGOBJDEPTH register value. This is the depth * buffer clear value, encoded in the depth buffer's format: either a * 32-bit float or a 16-bit unorm (with upper bits zeroed). */ __u32 isp_bgobjdepth; /** * @isp_bgobjvals: ISP_BGOBJVALS register value. The bottom 8-bits * contain the stencil buffer clear value. */ __u32 isp_bgobjvals; /** @ts_vtx: Timestamps for the vertex portion of the render */ struct drm_asahi_timestamps ts_vtx; /** @ts_frag: Timestamps for the fragment portion of the render */ struct drm_asahi_timestamps ts_frag; }; /** * struct drm_asahi_cmd_compute - Command to submit compute * * This command submits a control stream consisting of compute dispatches. There * is essentially no limit on how many compute dispatches may be included in a * single compute command, although timestamps are at command granularity. */ struct drm_asahi_cmd_compute { /** @flags: MBZ */ __u32 flags; /** @sampler_count: Number of samplers in the sampler heap. */ __u32 sampler_count; /** * @cdm_ctrl_stream_base: CDM_CTRL_STREAM_BASE register value. GPU * address to the beginning of the CDM control stream. */ __u64 cdm_ctrl_stream_base; /** * @cdm_ctrl_stream_end: GPU base address to the end of the hardware * control stream. Note this only considers the first contiguous segment * of the control stream, as the stream might jump elsewhere. */ __u64 cdm_ctrl_stream_end; /** @sampler_heap: Base address of the sampler heap. */ __u64 sampler_heap; /** @helper: Helper program used for this compute command */ struct drm_asahi_helper_program helper; /** @ts: Timestamps for the compute command */ struct drm_asahi_timestamps ts; }; /** * struct drm_asahi_get_time - Arguments passed to DRM_IOCTL_ASAHI_GET_TIME */ struct drm_asahi_get_time { /** @flags: MBZ. */ __u64 flags; /** @gpu_timestamp: On return, the GPU timestamp in nanoseconds. */ __u64 gpu_timestamp; }; /** * DRM_IOCTL_ASAHI() - Build an Asahi IOCTL number * @__access: Access type. Must be R, W or RW. * @__id: One of the DRM_ASAHI_xxx id. * @__type: Suffix of the type being passed to the IOCTL. * * Don't use this macro directly, use the DRM_IOCTL_ASAHI_xxx * values instead. * * Return: An IOCTL number to be passed to ioctl() from userspace. */ #define DRM_IOCTL_ASAHI(__access, __id, __type) \ DRM_IO ## __access(DRM_COMMAND_BASE + DRM_ASAHI_ ## __id, \ struct drm_asahi_ ## __type) /* Note: this is an enum so that it can be resolved by Rust bindgen. */ enum { DRM_IOCTL_ASAHI_GET_PARAMS = DRM_IOCTL_ASAHI(W, GET_PARAMS, get_params), DRM_IOCTL_ASAHI_GET_TIME = DRM_IOCTL_ASAHI(WR, GET_TIME, get_time), DRM_IOCTL_ASAHI_VM_CREATE = DRM_IOCTL_ASAHI(WR, VM_CREATE, vm_create), DRM_IOCTL_ASAHI_VM_DESTROY = DRM_IOCTL_ASAHI(W, VM_DESTROY, vm_destroy), DRM_IOCTL_ASAHI_VM_BIND = DRM_IOCTL_ASAHI(W, VM_BIND, vm_bind), DRM_IOCTL_ASAHI_GEM_CREATE = DRM_IOCTL_ASAHI(WR, GEM_CREATE, gem_create), DRM_IOCTL_ASAHI_GEM_MMAP_OFFSET = DRM_IOCTL_ASAHI(WR, GEM_MMAP_OFFSET, gem_mmap_offset), DRM_IOCTL_ASAHI_GEM_BIND_OBJECT = DRM_IOCTL_ASAHI(WR, GEM_BIND_OBJECT, gem_bind_object), DRM_IOCTL_ASAHI_QUEUE_CREATE = DRM_IOCTL_ASAHI(WR, QUEUE_CREATE, queue_create), DRM_IOCTL_ASAHI_QUEUE_DESTROY = DRM_IOCTL_ASAHI(W, QUEUE_DESTROY, queue_destroy), DRM_IOCTL_ASAHI_SUBMIT = DRM_IOCTL_ASAHI(W, SUBMIT, submit), }; #if defined(__cplusplus) } #endif #endif /* _ASAHI_DRM_H_ */