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/* amdgpu_drm.h -- Public header for the amdgpu driver -*- linux-c -*-
*
* Copyright 2000 Precision Insight , Inc . , Cedar Park , Texas .
* Copyright 2000 VA Linux Systems , Inc . , Fremont , California .
* Copyright 2002 Tungsten Graphics , Inc . , Cedar Park , Texas .
* Copyright 2014 Advanced Micro Devices , Inc .
*
* 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 , sublicense ,
* 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 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 NONINFRINGEMENT . IN NO EVENT SHALL
* THE COPYRIGHT HOLDER ( S ) OR AUTHOR ( S ) 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 .
*
* Authors :
* Kevin E . Martin < martin @ valinux . com >
* Gareth Hughes < gareth @ valinux . com >
* Keith Whitwell < keith @ tungstengraphics . com >
*/
# ifndef __AMDGPU_DRM_H__
# define __AMDGPU_DRM_H__
# include <drm/drm.h>
# define DRM_AMDGPU_GEM_CREATE 0x00
# define DRM_AMDGPU_GEM_MMAP 0x01
# define DRM_AMDGPU_CTX 0x02
# define DRM_AMDGPU_BO_LIST 0x03
# define DRM_AMDGPU_CS 0x04
# define DRM_AMDGPU_INFO 0x05
# define DRM_AMDGPU_GEM_METADATA 0x06
# define DRM_AMDGPU_GEM_WAIT_IDLE 0x07
# define DRM_AMDGPU_GEM_VA 0x08
# define DRM_AMDGPU_WAIT_CS 0x09
# define DRM_AMDGPU_GEM_OP 0x10
# define DRM_AMDGPU_GEM_USERPTR 0x11
# define DRM_IOCTL_AMDGPU_GEM_CREATE DRM_IOWR(DRM_COMMAND_BASE + DRM_AMDGPU_GEM_CREATE, union drm_amdgpu_gem_create)
# define DRM_IOCTL_AMDGPU_GEM_MMAP DRM_IOWR(DRM_COMMAND_BASE + DRM_AMDGPU_GEM_MMAP, union drm_amdgpu_gem_mmap)
# define DRM_IOCTL_AMDGPU_CTX DRM_IOWR(DRM_COMMAND_BASE + DRM_AMDGPU_CTX, union drm_amdgpu_ctx)
# define DRM_IOCTL_AMDGPU_BO_LIST DRM_IOWR(DRM_COMMAND_BASE + DRM_AMDGPU_BO_LIST, union drm_amdgpu_bo_list)
# define DRM_IOCTL_AMDGPU_CS DRM_IOWR(DRM_COMMAND_BASE + DRM_AMDGPU_CS, union drm_amdgpu_cs)
# define DRM_IOCTL_AMDGPU_INFO DRM_IOW(DRM_COMMAND_BASE + DRM_AMDGPU_INFO, struct drm_amdgpu_info)
# define DRM_IOCTL_AMDGPU_GEM_METADATA DRM_IOWR(DRM_COMMAND_BASE + DRM_AMDGPU_GEM_METADATA, struct drm_amdgpu_gem_metadata)
# define DRM_IOCTL_AMDGPU_GEM_WAIT_IDLE DRM_IOWR(DRM_COMMAND_BASE + DRM_AMDGPU_GEM_WAIT_IDLE, union drm_amdgpu_gem_wait_idle)
# define DRM_IOCTL_AMDGPU_GEM_VA DRM_IOWR(DRM_COMMAND_BASE + DRM_AMDGPU_GEM_VA, union drm_amdgpu_gem_va)
# define DRM_IOCTL_AMDGPU_WAIT_CS DRM_IOWR(DRM_COMMAND_BASE + DRM_AMDGPU_WAIT_CS, union drm_amdgpu_wait_cs)
# define DRM_IOCTL_AMDGPU_GEM_OP DRM_IOWR(DRM_COMMAND_BASE + DRM_AMDGPU_GEM_OP, struct drm_amdgpu_gem_op)
# define DRM_IOCTL_AMDGPU_GEM_USERPTR DRM_IOWR(DRM_COMMAND_BASE + DRM_AMDGPU_GEM_USERPTR, struct drm_amdgpu_gem_userptr)
# define AMDGPU_GEM_DOMAIN_CPU 0x1
# define AMDGPU_GEM_DOMAIN_GTT 0x2
# define AMDGPU_GEM_DOMAIN_VRAM 0x4
# define AMDGPU_GEM_DOMAIN_GDS 0x8
# define AMDGPU_GEM_DOMAIN_GWS 0x10
# define AMDGPU_GEM_DOMAIN_OA 0x20
/* Flag that CPU access will be required for the case of VRAM domain */
# define AMDGPU_GEM_CREATE_CPU_ACCESS_REQUIRED (1 << 0)
/* Flag that CPU access will not work, this VRAM domain is invisible */
# define AMDGPU_GEM_CREATE_NO_CPU_ACCESS (1 << 1)
/* Flag that USWC attributes should be used for GTT */
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# define AMDGPU_GEM_CREATE_CPU_GTT_USWC (1 << 2)
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struct drm_amdgpu_gem_create_in {
/** the requested memory size */
uint64_t bo_size ;
/** physical start_addr alignment in bytes for some HW requirements */
uint64_t alignment ;
/** the requested memory domains */
uint64_t domains ;
/** allocation flags */
uint64_t domain_flags ;
} ;
struct drm_amdgpu_gem_create_out {
/** returned GEM object handle */
uint32_t handle ;
uint32_t _pad ;
} ;
union drm_amdgpu_gem_create {
struct drm_amdgpu_gem_create_in in ;
struct drm_amdgpu_gem_create_out out ;
} ;
/** Opcode to create new residency list. */
# define AMDGPU_BO_LIST_OP_CREATE 0
/** Opcode to destroy previously created residency list */
# define AMDGPU_BO_LIST_OP_DESTROY 1
/** Opcode to update resource information in the list */
# define AMDGPU_BO_LIST_OP_UPDATE 2
struct drm_amdgpu_bo_list_in {
/** Type of operation */
uint32_t operation ;
/** Handle of list or 0 if we want to create one */
uint32_t list_handle ;
/** Number of BOs in list */
uint32_t bo_number ;
/** Size of each element describing BO */
uint32_t bo_info_size ;
/** Pointer to array describing BOs */
uint64_t bo_info_ptr ;
} ;
struct drm_amdgpu_bo_list_entry {
/** Handle of BO */
uint32_t bo_handle ;
/** New (if specified) BO priority to be used during migration */
uint32_t bo_priority ;
} ;
struct drm_amdgpu_bo_list_out {
/** Handle of resource list */
uint32_t list_handle ;
uint32_t _pad ;
} ;
union drm_amdgpu_bo_list {
struct drm_amdgpu_bo_list_in in ;
struct drm_amdgpu_bo_list_out out ;
} ;
/* context related */
# define AMDGPU_CTX_OP_ALLOC_CTX 1
# define AMDGPU_CTX_OP_FREE_CTX 2
# define AMDGPU_CTX_OP_QUERY_STATE 3
# define AMDGPU_CTX_OP_STATE_RUNNING 1
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/* GPU reset status */
# define AMDGPU_CTX_NO_RESET 0
# define AMDGPU_CTX_GUILTY_RESET 1 /* this the context caused it */
# define AMDGPU_CTX_INNOCENT_RESET 2 /* some other context caused it */
# define AMDGPU_CTX_UNKNOWN_RESET 3 /* unknown cause */
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struct drm_amdgpu_ctx_in {
uint32_t op ;
uint32_t flags ;
uint32_t ctx_id ;
uint32_t _pad ;
} ;
union drm_amdgpu_ctx_out {
struct {
uint32_t ctx_id ;
uint32_t _pad ;
} alloc ;
struct {
uint64_t flags ;
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/** Number of resets caused by this context so far. */
uint32_t hangs ;
/** Reset status since the last call of the ioctl. */
uint32_t reset_status ;
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} state ;
} ;
union drm_amdgpu_ctx {
struct drm_amdgpu_ctx_in in ;
union drm_amdgpu_ctx_out out ;
} ;
/*
* This is not a reliable API and you should expect it to fail for any
* number of reasons and have fallback path that do not use userptr to
* perform any operation .
*/
# define AMDGPU_GEM_USERPTR_READONLY (1 << 0)
# define AMDGPU_GEM_USERPTR_ANONONLY (1 << 1)
# define AMDGPU_GEM_USERPTR_VALIDATE (1 << 2)
# define AMDGPU_GEM_USERPTR_REGISTER (1 << 3)
struct drm_amdgpu_gem_userptr {
uint64_t addr ;
uint64_t size ;
uint32_t flags ;
uint32_t handle ;
} ;
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/* same meaning as the GB_TILE_MODE and GL_MACRO_TILE_MODE fields */
# define AMDGPU_TILING_ARRAY_MODE_SHIFT 0
# define AMDGPU_TILING_ARRAY_MODE_MASK 0xf
# define AMDGPU_TILING_PIPE_CONFIG_SHIFT 4
# define AMDGPU_TILING_PIPE_CONFIG_MASK 0x1f
# define AMDGPU_TILING_TILE_SPLIT_SHIFT 9
# define AMDGPU_TILING_TILE_SPLIT_MASK 0x7
# define AMDGPU_TILING_MICRO_TILE_MODE_SHIFT 12
# define AMDGPU_TILING_MICRO_TILE_MODE_MASK 0x7
# define AMDGPU_TILING_BANK_WIDTH_SHIFT 15
# define AMDGPU_TILING_BANK_WIDTH_MASK 0x3
# define AMDGPU_TILING_BANK_HEIGHT_SHIFT 17
# define AMDGPU_TILING_BANK_HEIGHT_MASK 0x3
# define AMDGPU_TILING_MACRO_TILE_ASPECT_SHIFT 19
# define AMDGPU_TILING_MACRO_TILE_ASPECT_MASK 0x3
# define AMDGPU_TILING_NUM_BANKS_SHIFT 21
# define AMDGPU_TILING_NUM_BANKS_MASK 0x3
# define AMDGPU_TILING_SET(field, value) \
( ( ( value ) & AMDGPU_TILING_ # # field # # _MASK ) < < AMDGPU_TILING_ # # field # # _SHIFT )
# define AMDGPU_TILING_GET(value, field) \
( ( ( value ) > > AMDGPU_TILING_ # # field # # _SHIFT ) & AMDGPU_TILING_ # # field # # _MASK )
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# define AMDGPU_GEM_METADATA_OP_SET_METADATA 1
# define AMDGPU_GEM_METADATA_OP_GET_METADATA 2
/** The same structure is shared for input/output */
struct drm_amdgpu_gem_metadata {
uint32_t handle ; /* GEM Object handle */
uint32_t op ; /** Do we want get or set metadata */
struct {
uint64_t flags ;
uint64_t tiling_info ; /* family specific tiling info */
uint32_t data_size_bytes ;
uint32_t data [ 64 ] ;
} data ;
} ;
struct drm_amdgpu_gem_mmap_in {
uint32_t handle ; /** the GEM object handle */
uint32_t _pad ;
} ;
struct drm_amdgpu_gem_mmap_out {
uint64_t addr_ptr ; /** mmap offset from the vma offset manager */
} ;
union drm_amdgpu_gem_mmap {
struct drm_amdgpu_gem_mmap_in in ;
struct drm_amdgpu_gem_mmap_out out ;
} ;
struct drm_amdgpu_gem_wait_idle_in {
uint32_t handle ; /* GEM object handle */
uint32_t flags ;
uint64_t timeout ; /* Timeout to wait. If 0 then returned immediately with the status */
} ;
struct drm_amdgpu_gem_wait_idle_out {
uint32_t status ; /* BO status: 0 - BO is idle, 1 - BO is busy */
uint32_t domain ; /* Returned current memory domain */
} ;
union drm_amdgpu_gem_wait_idle {
struct drm_amdgpu_gem_wait_idle_in in ;
struct drm_amdgpu_gem_wait_idle_out out ;
} ;
struct drm_amdgpu_wait_cs_in {
uint64_t handle ;
uint64_t timeout ;
uint32_t ip_type ;
uint32_t ip_instance ;
uint32_t ring ;
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uint32_t ctx_id ;
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} ;
struct drm_amdgpu_wait_cs_out {
uint64_t status ;
} ;
union drm_amdgpu_wait_cs {
struct drm_amdgpu_wait_cs_in in ;
struct drm_amdgpu_wait_cs_out out ;
} ;
/* Sets or returns a value associated with a buffer. */
struct drm_amdgpu_gem_op {
uint32_t handle ; /* buffer */
uint32_t op ; /* AMDGPU_GEM_OP_* */
uint64_t value ; /* input or return value */
} ;
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# define AMDGPU_GEM_OP_GET_GEM_CREATE_INFO 0
# define AMDGPU_GEM_OP_SET_PLACEMENT 1
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# define AMDGPU_VA_OP_MAP 1
# define AMDGPU_VA_OP_UNMAP 2
# define AMDGPU_VA_RESULT_OK 0
# define AMDGPU_VA_RESULT_ERROR 1
# define AMDGPU_VA_RESULT_VA_INVALID_ALIGNMENT 2
/* Mapping flags */
/* readable mapping */
# define AMDGPU_VM_PAGE_READABLE (1 << 1)
/* writable mapping */
# define AMDGPU_VM_PAGE_WRITEABLE (1 << 2)
/* executable mapping, new for VI */
# define AMDGPU_VM_PAGE_EXECUTABLE (1 << 3)
struct drm_amdgpu_gem_va_in {
/* GEM object handle */
uint32_t handle ;
uint32_t _pad ;
/* map or unmap*/
uint32_t operation ;
/* specify mapping flags */
uint32_t flags ;
/* va address to assign . Must be correctly aligned.*/
uint64_t va_address ;
/* Specify offset inside of BO to assign. Must be correctly aligned.*/
uint64_t offset_in_bo ;
/* Specify mapping size. If 0 and offset is 0 then map the whole BO.*/
/* Must be correctly aligned. */
uint64_t map_size ;
} ;
struct drm_amdgpu_gem_va_out {
uint32_t result ;
uint32_t _pad ;
} ;
union drm_amdgpu_gem_va {
struct drm_amdgpu_gem_va_in in ;
struct drm_amdgpu_gem_va_out out ;
} ;
# define AMDGPU_HW_IP_GFX 0
# define AMDGPU_HW_IP_COMPUTE 1
# define AMDGPU_HW_IP_DMA 2
# define AMDGPU_HW_IP_UVD 3
# define AMDGPU_HW_IP_VCE 4
# define AMDGPU_HW_IP_NUM 5
# define AMDGPU_HW_IP_INSTANCE_MAX_COUNT 1
# define AMDGPU_CHUNK_ID_IB 0x01
# define AMDGPU_CHUNK_ID_FENCE 0x02
struct drm_amdgpu_cs_chunk {
uint32_t chunk_id ;
uint32_t length_dw ;
uint64_t chunk_data ;
} ;
struct drm_amdgpu_cs_in {
/** Rendering context id */
uint32_t ctx_id ;
/** Handle of resource list associated with CS */
uint32_t bo_list_handle ;
uint32_t num_chunks ;
uint32_t _pad ;
/* this points to uint64_t * which point to cs chunks */
uint64_t chunks ;
} ;
struct drm_amdgpu_cs_out {
uint64_t handle ;
} ;
union drm_amdgpu_cs {
struct drm_amdgpu_cs_in in ;
struct drm_amdgpu_cs_out out ;
} ;
/* Specify flags to be used for IB */
/* This IB should be submitted to CE */
# define AMDGPU_IB_FLAG_CE (1<<0)
/* GDS is used by this IB */
# define AMDGPU_IB_FLAG_GDS (1<<1)
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/* CE Preamble */
# define AMDGPU_IB_FLAG_PREAMBLE (1<<2)
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struct drm_amdgpu_cs_chunk_ib {
/**
* Handle of GEM object to be used as IB or 0 if it is already in
* residency list .
*/
uint32_t handle ;
uint32_t flags ; /* IB Flags */
uint64_t va_start ; /* Virtual address to begin IB execution */
uint32_t ib_bytes ; /* Size of submission */
uint32_t ip_type ; /* HW IP to submit to */
uint32_t ip_instance ; /* HW IP index of the same type to submit to */
uint32_t ring ; /* Ring index to submit to */
} ;
struct drm_amdgpu_cs_chunk_fence {
uint32_t handle ;
uint32_t offset ;
} ;
struct drm_amdgpu_cs_chunk_data {
union {
struct drm_amdgpu_cs_chunk_ib ib_data ;
struct drm_amdgpu_cs_chunk_fence fence_data ;
} ;
} ;
/**
* Query h / w info : Flag that this is integrated ( a . h . a . fusion ) GPU
*
*/
# define AMDGPU_IDS_FLAGS_FUSION 0x1
/* indicate if acceleration can be working */
# define AMDGPU_INFO_ACCEL_WORKING 0x00
/* get the crtc_id from the mode object id? */
# define AMDGPU_INFO_CRTC_FROM_ID 0x01
/* query hw IP info */
# define AMDGPU_INFO_HW_IP_INFO 0x02
/* query hw IP instance count for the specified type */
# define AMDGPU_INFO_HW_IP_COUNT 0x03
/* timestamp for GL_ARB_timer_query */
# define AMDGPU_INFO_TIMESTAMP 0x05
/* Query the firmware version */
# define AMDGPU_INFO_FW_VERSION 0x0e
/* Subquery id: Query VCE firmware version */
# define AMDGPU_INFO_FW_VCE 0x1
/* Subquery id: Query UVD firmware version */
# define AMDGPU_INFO_FW_UVD 0x2
/* Subquery id: Query GMC firmware version */
# define AMDGPU_INFO_FW_GMC 0x03
/* Subquery id: Query GFX ME firmware version */
# define AMDGPU_INFO_FW_GFX_ME 0x04
/* Subquery id: Query GFX PFP firmware version */
# define AMDGPU_INFO_FW_GFX_PFP 0x05
/* Subquery id: Query GFX CE firmware version */
# define AMDGPU_INFO_FW_GFX_CE 0x06
/* Subquery id: Query GFX RLC firmware version */
# define AMDGPU_INFO_FW_GFX_RLC 0x07
/* Subquery id: Query GFX MEC firmware version */
# define AMDGPU_INFO_FW_GFX_MEC 0x08
/* Subquery id: Query SMC firmware version */
# define AMDGPU_INFO_FW_SMC 0x0a
/* Subquery id: Query SDMA firmware version */
# define AMDGPU_INFO_FW_SDMA 0x0b
/* number of bytes moved for TTM migration */
# define AMDGPU_INFO_NUM_BYTES_MOVED 0x0f
/* the used VRAM size */
# define AMDGPU_INFO_VRAM_USAGE 0x10
/* the used GTT size */
# define AMDGPU_INFO_GTT_USAGE 0x11
/* Information about GDS, etc. resource configuration */
# define AMDGPU_INFO_GDS_CONFIG 0x13
/* Query information about VRAM and GTT domains */
# define AMDGPU_INFO_VRAM_GTT 0x14
/* Query information about register in MMR address space*/
# define AMDGPU_INFO_READ_MMR_REG 0x15
/* Query information about device: rev id, family, etc. */
# define AMDGPU_INFO_DEV_INFO 0x16
/* visible vram usage */
# define AMDGPU_INFO_VIS_VRAM_USAGE 0x17
# define AMDGPU_INFO_MMR_SE_INDEX_SHIFT 0
# define AMDGPU_INFO_MMR_SE_INDEX_MASK 0xff
# define AMDGPU_INFO_MMR_SH_INDEX_SHIFT 8
# define AMDGPU_INFO_MMR_SH_INDEX_MASK 0xff
/* Input structure for the INFO ioctl */
struct drm_amdgpu_info {
/* Where the return value will be stored */
uint64_t return_pointer ;
/* The size of the return value. Just like "size" in "snprintf",
* it limits how many bytes the kernel can write . */
uint32_t return_size ;
/* The query request id. */
uint32_t query ;
union {
struct {
uint32_t id ;
uint32_t _pad ;
} mode_crtc ;
struct {
/** AMDGPU_HW_IP_* */
uint32_t type ;
/**
* Index of the IP if there are more IPs of the same type .
* Ignored by AMDGPU_INFO_HW_IP_COUNT .
*/
uint32_t ip_instance ;
} query_hw_ip ;
struct {
uint32_t dword_offset ;
uint32_t count ; /* number of registers to read */
uint32_t instance ;
uint32_t flags ;
} read_mmr_reg ;
struct {
/** AMDGPU_INFO_FW_* */
uint32_t fw_type ;
/** Index of the IP if there are more IPs of the same type. */
uint32_t ip_instance ;
/**
* Index of the engine . Whether this is used depends
* on the firmware type . ( e . g . MEC , SDMA )
*/
uint32_t index ;
uint32_t _pad ;
} query_fw ;
} ;
} ;
struct drm_amdgpu_info_gds {
/** GDS GFX partition size */
uint32_t gds_gfx_partition_size ;
/** GDS compute partition size */
uint32_t compute_partition_size ;
/** total GDS memory size */
uint32_t gds_total_size ;
/** GWS size per GFX partition */
uint32_t gws_per_gfx_partition ;
/** GSW size per compute partition */
uint32_t gws_per_compute_partition ;
/** OA size per GFX partition */
uint32_t oa_per_gfx_partition ;
/** OA size per compute partition */
uint32_t oa_per_compute_partition ;
uint32_t _pad ;
} ;
struct drm_amdgpu_info_vram_gtt {
uint64_t vram_size ;
uint64_t vram_cpu_accessible_size ;
uint64_t gtt_size ;
} ;
struct drm_amdgpu_info_firmware {
uint32_t ver ;
uint32_t feature ;
} ;
struct drm_amdgpu_info_device {
/** PCI Device ID */
uint32_t device_id ;
/** Internal chip revision: A0, A1, etc.) */
uint32_t chip_rev ;
uint32_t external_rev ;
/** Revision id in PCI Config space */
uint32_t pci_rev ;
uint32_t family ;
uint32_t num_shader_engines ;
uint32_t num_shader_arrays_per_engine ;
uint32_t gpu_counter_freq ; /* in KHz */
uint64_t max_engine_clock ; /* in KHz */
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uint64_t max_memory_clock ; /* in KHz */
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/* cu information */
uint32_t cu_active_number ;
uint32_t cu_ao_mask ;
uint32_t cu_bitmap [ 4 ] [ 4 ] ;
/** Render backend pipe mask. One render backend is CB+DB. */
uint32_t enabled_rb_pipes_mask ;
uint32_t num_rb_pipes ;
uint32_t num_hw_gfx_contexts ;
uint32_t _pad ;
uint64_t ids_flags ;
/** Starting virtual address for UMDs. */
uint64_t virtual_address_offset ;
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/** The maximum virtual address */
uint64_t virtual_address_max ;
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/** Required alignment of virtual addresses. */
uint32_t virtual_address_alignment ;
/** Page table entry - fragment size */
uint32_t pte_fragment_size ;
uint32_t gart_page_size ;
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/** constant engine ram size*/
uint32_t ce_ram_size ;
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} ;
struct drm_amdgpu_info_hw_ip {
/** Version of h/w IP */
uint32_t hw_ip_version_major ;
uint32_t hw_ip_version_minor ;
/** Capabilities */
uint64_t capabilities_flags ;
/** Bitmask of available rings. Bit 0 means ring 0, etc. */
uint32_t available_rings ;
uint32_t _pad ;
} ;
/*
* Supported GPU families
*/
# define AMDGPU_FAMILY_UNKNOWN 0
# define AMDGPU_FAMILY_CI 120 /* Bonaire, Hawaii */
# define AMDGPU_FAMILY_KV 125 /* Kaveri, Kabini, Mullins */
# define AMDGPU_FAMILY_VI 130 /* Iceland, Tonga */
# define AMDGPU_FAMILY_CZ 135 /* Carrizo */
# endif