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gpu: nvgpu: add linux REMAP support

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Add REMAP ioctl and accompanying support to the linux nvgpu driver.

REMAP support provides per-page control over sparse VM areas using the
concept of a virtual memory pool.

The REMAP ioctl accepts a list of operations (each a map or unmap) that
modify the VM area pages tracked by the virtual mmemory pool.

Inclusion of REMAP support in the nvgpu build is controlled by the new
CONFIG_NVGPU_REMAP flag.  This flag is enabled by default for linux builds.
A new NVGPU_GPU_FLAGS_SUPPORT_REMAP characteristics flag is added for use
in detecting when REMAP support is available.

When a VM allocation tagged with NVGPU_VM_AREA_ALLOC_SPARSE is made the
base virtual memory pool resources are allocated.  Per-page resources are
later allocated when the NVGPU_AS_IOCTL_REMAP ioctl is issued.  All REMAP
resources are released when the corresponding VM area is freed.

Jira NVGPU-6804

Change-Id: I1f2cdc0c06c1698a62640c1c6fbcb2f9db24a0bc
Signed-off-by: scottl <scottl@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvgpu/+/2542178
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
This commit is contained in:
scottl
2021-06-08 23:59:08 -07:00
committed by mobile promotions
parent cecb0666f6
commit 3cd256b344
20 changed files with 1761 additions and 12 deletions
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4
include/uapi/linux/nvgpu-ctrl.h
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@@ -158,6 +158,8 @@ struct nvgpu_gpu_zbc_query_table_args {
#define NVGPU_GPU_FLAGS_SUPPORT_FAULT_RECOVERY (1ULL << 33)
/* Mapping modify is enabled */
#define NVGPU_GPU_FLAGS_SUPPORT_MAPPING_MODIFY (1ULL << 34)
/* Remap is enabled */
#define NVGPU_GPU_FLAGS_SUPPORT_REMAP (1ULL << 35)
/* Compression is enabled */
#define NVGPU_GPU_FLAGS_SUPPORT_COMPRESSION (1ULL << 36)
/* SM TTU is enabled */
@@ -1100,4 +1102,4 @@ struct nvgpu_gpu_register_buffer_args {
#define NVGPU_GPU_IOCTL_MAX_ARG_SIZE \
sizeof(struct nvgpu_gpu_get_cpu_time_correlation_info_args)
#endif
#endif /* _UAPI__LINUX_NVGPU_CTRL_H__ */