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gpu: nvgpu: ioctl for flushing GPU L2

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CUDA devtools need to be able to flush the GPU's cache
in a sideband fashion and so cannot use methods. This
change implements an nvgpu_gpu_ioctl to flush and
optionally invalidate the GPU's L2 cache and flush fb.

Change-Id: Ib06a0bc8d8880ffbfe4b056518cc3c3df0cc4988
Signed-off-by: sujeet baranwal <sbaranwal@nvidia.com>
Signed-off-by: Mayank Kaushik <mkaushik@nvidia.com>
Reviewed-on: http://git-master/r/671809
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>
Tested-by: Terje Bergstrom <tbergstrom@nvidia.com>
This commit is contained in:
sujeet baranwal
2015-02-19 10:34:51 -08:00
committed by Dan Willemsen
parent ac205be1d3
commit 8d1ab756ed
5 changed files with 38 additions and 10 deletions
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13
include/uapi/linux/nvgpu.h
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@@ -242,6 +242,14 @@ struct nvgpu_gpu_open_channel_args {
__s32 channel_fd;
};
/* L2 cache writeback, optionally invalidate clean lines and flush fb */
struct nvgpu_gpu_l2_fb_args {
__u32 l2_flush:1;
__u32 l2_invalidate:1;
__u32 fb_flush:1;
__u32 reserved;
} __packed;
#define NVGPU_GPU_IOCTL_ZCULL_GET_CTX_SIZE \
_IOR(NVGPU_GPU_IOCTL_MAGIC, 1, struct nvgpu_gpu_zcull_get_ctx_size_args)
#define NVGPU_GPU_IOCTL_ZCULL_GET_INFO \
@@ -264,13 +272,14 @@ struct nvgpu_gpu_open_channel_args {
_IOWR(NVGPU_GPU_IOCTL_MAGIC, 10, struct nvgpu_gpu_get_tpc_masks_args)
#define NVGPU_GPU_IOCTL_OPEN_CHANNEL \
_IOWR(NVGPU_GPU_IOCTL_MAGIC, 11, struct nvgpu_gpu_open_channel_args)
#define NVGPU_GPU_IOCTL_FLUSH_L2 \
_IOWR(NVGPU_DBG_GPU_IOCTL_MAGIC, 12, struct nvgpu_gpu_l2_fb_args)
#define NVGPU_GPU_IOCTL_LAST \
_IOC_NR(NVGPU_GPU_IOCTL_OPEN_CHANNEL)
_IOC_NR(NVGPU_GPU_IOCTL_FLUSH_L2)
#define NVGPU_GPU_IOCTL_MAX_ARG_SIZE \
sizeof(struct nvgpu_gpu_prepare_compressible_read_args)
/*
* /dev/nvhost-tsg-gpu device
*