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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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2
drivers/gpu/nvgpu/os/linux/ioctl_ctrl.c
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@@ -268,6 +268,8 @@ static struct nvgpu_flags_mapping flags_mapping[] = {
NVGPU_SUPPORT_FAULT_RECOVERY},
{NVGPU_GPU_FLAGS_SUPPORT_MAPPING_MODIFY,
NVGPU_SUPPORT_MAPPING_MODIFY},
{NVGPU_GPU_FLAGS_SUPPORT_REMAP,
NVGPU_SUPPORT_REMAP},
{NVGPU_GPU_FLAGS_SUPPORT_COMPRESSION,
NVGPU_SUPPORT_COMPRESSION},
{NVGPU_GPU_FLAGS_SUPPORT_SM_TTU,