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gpu: nvgpu: add linux MAPPING_MODIFY ioctl

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Add new MAPPING_MODIFY ioctl to the linux nvgpu driver.

This ioctl is used (for example) by the NvRmGpuMappingModify API to
change the kind of an existing mapping.

For compressed mappings the ioctl can be used to do the following:

 * switch between two different compressed kinds
 * switch between compressed and incompressed kinds

For incompressed mappings the ioctl can be used to do the following:

 * switch between two different incompressed kinds

In order to properly update an existing mapping the nvgpu_mapped_buf
structure has been extended to cache the following state when the
mapping is first created:

 * the compression tag offset (if applicable)
 * the GMMU read/write flags
 * the memory aperture

The unused ctag_lines field in the nvgpu_ctag_buffer_info structure
has been replaced with a new ctag_offset field.

Jira NVGPU-6374

Change-Id: I647ab9c2c272e3f9b52f1ccefc5e0de4577c14f1
Signed-off-by: scottl <scottl@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvgpu/+/2468100
Reviewed-by: svc-mobile-coverity <svc-mobile-coverity@nvidia.com>
Reviewed-by: svc-mobile-misra <svc-mobile-misra@nvidia.com>
Reviewed-by: svc-mobile-cert <svc-mobile-cert@nvidia.com>
Reviewed-by: Alex Waterman <alexw@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
GVS: Gerrit_Virtual_Submit
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>
This commit is contained in:
scottl
2021-01-08 14:44:25 -08:00
committed by mobile promotions
parent 47f2e68013
commit 456a814db5
6 changed files with 208 additions and 10 deletions
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59
include/uapi/linux/nvgpu.h
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@@ -1208,9 +1208,9 @@ struct nvgpu_as_bind_channel_args {
*
* @buffer_offset [IN]
*
* Specify an offset into the physical buffer to being the mapping at. For
* example imagine a DMA buffer 32KB long. However, you wish to only this
* buffer starting at 8KB. In such a case you would pass 8KB as the
* Specify an offset into the physical buffer to begin the mapping at. For
* example imagine a DMA buffer 32KB long. However, you wish to only map
* this buffer starting at 8KB. In such a case you would pass 8KB as the
* @buffer_offset. This is only available with fixed address mappings. All
* regular (non-fixed) mappings require this field to be set to 0. This field
* is in bytes.
@@ -1397,6 +1397,53 @@ struct nvgpu_as_get_sync_ro_map_args {
__u32 padding;
};
/*
* VM mapping modify IOCTL
*
* This ioctl changes the kind of an existing mapped buffer region.
*
* Usage of this API is as follows.
*
* @compr_kind [IN]
*
* Specify the new compressed kind to be used for the mapping. This
* parameter is only valid if compression resources are allocated to the
* underlying physical buffer. If NV_KIND_INVALID is specified then the
* fallback incompr_kind parameter is used.
*
* @incompr_kind [IN]
*
* Specify the new kind to be used for the mapping if compression is not
* to be used. If NV_KIND_INVALID is specified then incompressible fallback
* is not allowed.
*
* @buffer_offset [IN]
*
* Specifies the beginning offset of the region within the existing buffer
* for which the kind should be modified. This field is in bytes.
*
* @buffer_size [IN]
*
* Specifies the size of the region within the existing buffer for which the
* kind should be updated. This field is in bytes. Note that the region
* described by <buffer_offset, buffer_offset + buffer_size> must reside
* entirely within the existing buffer.
*
* @map_address [IN]
*
* The address of the existing buffer in the GPU virtual address space
* specified in bytes.
*/
struct nvgpu_as_mapping_modify_args {
__s16 compr_kind; /* in */
__s16 incompr_kind; /* in */
__u64 buffer_offset; /* in, offset of mapped buffer region */
__u64 buffer_size; /* in, size of mapped buffer region */
__u64 map_address; /* in, base virtual address of mapped buffer */
};
#define NVGPU_AS_IOCTL_BIND_CHANNEL \
_IOWR(NVGPU_AS_IOCTL_MAGIC, 1, struct nvgpu_as_bind_channel_args)
#define NVGPU32_AS_IOCTL_ALLOC_SPACE \
@@ -1419,9 +1466,11 @@ struct nvgpu_as_get_sync_ro_map_args {
_IOWR(NVGPU_AS_IOCTL_MAGIC, 11, struct nvgpu_as_map_buffer_batch_args)
#define NVGPU_AS_IOCTL_GET_SYNC_RO_MAP \
_IOR(NVGPU_AS_IOCTL_MAGIC, 12, struct nvgpu_as_get_sync_ro_map_args)
#define NVGPU_AS_IOCTL_MAPPING_MODIFY \
_IOWR(NVGPU_AS_IOCTL_MAGIC, 13, struct nvgpu_as_mapping_modify_args)
#define NVGPU_AS_IOCTL_LAST \
_IOC_NR(NVGPU_AS_IOCTL_GET_SYNC_RO_MAP)
#define NVGPU_AS_IOCTL_LAST \
_IOC_NR(NVGPU_AS_IOCTL_MAPPING_MODIFY)
#define NVGPU_AS_IOCTL_MAX_ARG_SIZE \
sizeof(struct nvgpu_as_map_buffer_ex_args)