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gpu: Add host1x-fence driver

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Add driver for implementing an UAPI for conversion between
SYNC_FILE FDs and raw syncpoint ID / value pairs.

Signed-off-by: Mikko Perttunen <mperttunen@nvidia.com>
Change-Id: I54e30877f782e3e67ca91e09589d0c4862a257cd
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nv-oot/+/2729238
Reviewed-by: Jonathan Hunter <jonathanh@nvidia.com>
GVS: Gerrit_Virtual_Submit
This commit is contained in:
Mikko Perttunen
2022-06-15 14:20:40 +03:00
committed by mobile promotions
parent a7fc1600d8
commit 5b33382ce2
4 changed files with 363 additions and 0 deletions
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82
drivers/gpu/host1x-fence/include/uapi/linux/host1x-fence.h Normal file
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/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
/* Copyright (c) 2022 NVIDIA Corporation */
#ifndef _UAPI__LINUX_HOST1X_FENCE_H
#define _UAPI__LINUX_HOST1X_FENCE_H
#include <linux/ioctl.h>
#include <linux/types.h>
#if defined(__cplusplus)
extern "C" {
#endif
struct host1x_create_fence {
/**
* @id: [in]
*
* ID of the syncpoint to create a fence for.
*/
__u32 id;
/**
* @threshold: [in]
*
* When the syncpoint reaches this value, the fence will be signaled.
* The syncpoint is considered to have reached the threshold when the
* following condition is true:
*
* ((value - threshold) & 0x80000000U) == 0U
*
*/
__u32 threshold;
/**
* @fence_fd: [out]
*
* New sync_file file descriptor containing the created fence.
*/
__s32 fence_fd;
__u32 reserved[1];
};
struct host1x_fence_extract_fence {
__u32 id;
__u32 threshold;
};
struct host1x_fence_extract {
/**
* @fence_fd: [in]
*
* sync_file file descriptor
*/
__s32 fence_fd;
/**
* @num_fences: [in,out]
*
* In: size of the `fences_ptr` array counted in elements.
* Out: required size of the `fences_ptr` array counted in elements.
*/
__u32 num_fences;
/**
* @fences_ptr: [in]
*
* Pointer to array of `struct host1x_fence_extract_fence`.
*/
__u64 fences_ptr;
__u32 reserved[2];
};
#define HOST1X_IOCTL_CREATE_FENCE _IOWR('X', 0x02, struct host1x_create_fence)
#define HOST1X_IOCTL_FENCE_EXTRACT _IOWR('X', 0x05, struct host1x_fence_extract)
#if defined(__cplusplus)
}
#endif
#endif