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drm/amdkfd: Add DMABuf import functionality

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This is used for interoperability between ROCm compute and graphics
APIs. It allows importing graphics driver BOs into the ROCm SVM
address space for zero-copy GPU access.

The API is split into two steps (query and import) to allow user mode
to manage the virtual address space allocation for the imported buffer.

Acked-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Felix Kuehling
2018-11-20 21:00:29 -05:00
committed by Alex Deucher
parent 3704d56e1a
commit 1dde0ea95b
9 changed files with 287 additions and 5 deletions
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26
include/uapi/linux/kfd_ioctl.h
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@@ -398,6 +398,24 @@ struct kfd_ioctl_unmap_memory_from_gpu_args {
__u32 n_success; /* to/from KFD */
};
struct kfd_ioctl_get_dmabuf_info_args {
__u64 size; /* from KFD */
__u64 metadata_ptr; /* to KFD */
__u32 metadata_size; /* to KFD (space allocated by user)
* from KFD (actual metadata size)
*/
__u32 gpu_id; /* from KFD */
__u32 flags; /* from KFD (KFD_IOC_ALLOC_MEM_FLAGS) */
__u32 dmabuf_fd; /* to KFD */
};
struct kfd_ioctl_import_dmabuf_args {
__u64 va_addr; /* to KFD */
__u64 handle; /* from KFD */
__u32 gpu_id; /* to KFD */
__u32 dmabuf_fd; /* to KFD */
};
#define AMDKFD_IOCTL_BASE 'K'
#define AMDKFD_IO(nr) _IO(AMDKFD_IOCTL_BASE, nr)
#define AMDKFD_IOR(nr, type) _IOR(AMDKFD_IOCTL_BASE, nr, type)
@@ -486,7 +504,13 @@ struct kfd_ioctl_unmap_memory_from_gpu_args {
#define AMDKFD_IOC_GET_QUEUE_WAVE_STATE \
AMDKFD_IOWR(0x1B, struct kfd_ioctl_get_queue_wave_state_args)
#define AMDKFD_IOC_GET_DMABUF_INFO \
AMDKFD_IOWR(0x1C, struct kfd_ioctl_get_dmabuf_info_args)
#define AMDKFD_IOC_IMPORT_DMABUF \
AMDKFD_IOWR(0x1D, struct kfd_ioctl_import_dmabuf_args)
#define AMDKFD_COMMAND_START 0x01
#define AMDKFD_COMMAND_END 0x1C
#define AMDKFD_COMMAND_END 0x1E
#endif