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gpu: nvgpu: User-space managed address space support

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Implement NVGPU_GPU_IOCTL_ALLOC_AS_FLAGS_USERSPACE_MANAGED, which
enables creating userspace-managed GPU address spaces.

When an address space is marked as userspace-managed, the following
changes are in effect:

- Only fixed-address mappings are allowed.
- VA space allocation for fixed-address mappings is not required,
  except to mark space as sparse.
- Maps and unmaps are always immediate. In particular, the mapping
  ref increments at kickoffs and decrements at job completion are
  skipped.

Bug 1614735
Bug 1623949
Bug 1660392

Change-Id: I834fe19b3f65e9b02c268952383eddee0e465759
Signed-off-by: Sami Kiminki <skiminki@nvidia.com>
Reviewed-on: http://git-master/r/738558
Reviewed-on: http://git-master/r/833253
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>
Tested-by: Terje Bergstrom <tbergstrom@nvidia.com>
This commit is contained in:
Sami Kiminki
2015-05-04 18:41:23 +03:00
committed by Terje Bergstrom
parent 503d3a0b10
commit 9d2c9072c8
9 changed files with 148 additions and 38 deletions
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19
include/uapi/linux/nvgpu.h
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@@ -106,6 +106,8 @@ struct nvgpu_gpu_zbc_query_table_args {
#define NVGPU_GPU_FLAGS_SUPPORT_CYCLE_STATS (1 << 4)
/* NVGPU_IOCTL_CHANNEL_CYCLE_STATS_SNAPSHOT is available */
#define NVGPU_GPU_FLAGS_SUPPORT_CYCLE_STATS_SNAPSHOT (1 << 6)
/* User-space managed address spaces support */
#define NVGPU_GPU_FLAGS_SUPPORT_USERSPACE_MANAGED_AS (1 << 7)
struct nvgpu_gpu_characteristics {
__u32 arch;
@@ -239,7 +241,22 @@ struct nvgpu_gpu_mark_compressible_write_args {
struct nvgpu_alloc_as_args {
__u32 big_page_size;
__s32 as_fd;
__u64 reserved; /* must be zero */
/*
* The GPU address space will be managed by the userspace. This has
* the following changes in functionality:
* 1. All non-fixed-offset user mappings are rejected (i.e.,
* fixed-offset only)
* 2. Address space does not need to be allocated for fixed-offset
* mappings, except to mark sparse address space areas.
* 3. Maps and unmaps are immediate. In particular, mapping ref
* increments at kickoffs and decrements at job completion are
* bypassed.
*/
#define NVGPU_GPU_IOCTL_ALLOC_AS_FLAGS_USERSPACE_MANAGED (1 << 0)
__u32 flags;
__u32 reserved; /* must be zero */
};
struct nvgpu_gpu_open_tsg_args {