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soc: qcom: sync: export qcom speculative fence interface

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This change adds an interface to check if a given speculative
fence is bound. If fence is not bound, it will wait for the
speculative fence ioctl to bind the fence, or else timeout.

Change-Id: Iee014ad282c9b53d8785f0f9341ae28a9c616969
Signed-off-by: Ingrid Gallardo <quic_ingridg@quicinc.com>
This commit is contained in:
Ingrid Gallardo 2021-11-24 16:10:27 -08:00 committed by Gerrit - the friendly Code Review server
parent 58dfec1dca
commit 653be265a4
1 changed files with 39 additions and 0 deletions
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39
include/linux/soc/qcom/qcom_sync_file.h Normal file
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/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Copyright (c) 2021, The Linux Foundation. All rights reserved.
* Copyright (c) 2021-2022 Qualcomm Innovation Center, Inc. All rights reserved.
*/
#ifndef _LINUX_QCOM_SPEC_SYNC_H
#define _LINUX_QCOM_SPEC_SYNC_H
#include <linux/dma-fence-array.h>
#define SPEC_FENCE_FLAG_FENCE_ARRAY 16 /* fence-array is speculative */
#define SPEC_FENCE_FLAG_FENCE_ARRAY_BOUND 17 /* fence-array is bound */
#if IS_ENABLED(CONFIG_QCOM_SPEC_SYNC)
/**
* spec_sync_wait_bind_array() - Waits until the fence-array passed as parameter is bound.
* @fence_array: fence-array to wait-on until it is populated.
* @timeout_ms: timeout to wait.
*
* This function will wait until the fence-array passed as paremeter is bound; i.e. all the
* dma-fences that conform the fence-array are populated by the spec-fence driver bind ioctl.
* Once this function returns success, all the fences in the array should be valid.
*
* Return: 0 on success or negative errno (-EINVAL)
*/
int spec_sync_wait_bind_array(struct dma_fence_array *fence_array, u32 timeout_ms);
#else
static inline int spec_sync_wait_bind_array(struct dma_fence_array *fence_array, u32 timeout_ms)
{
return -EINVAL;
}
#endif /* CONFIG_QCOM_SPEC_SYNC */
#endif /* _LINUX_QCOM_SPEC_SYNC_H */