linux-stable/drivers/dma-buf/dma-buf-sysfs-stats.h
Hridya Valsaraju c715def515 dma-buf: Delete the DMA-BUF attachment sysfs statistics
The DMA-BUF attachment statistics form a subset of the DMA-BUF
sysfs statistics that recently merged to the drm-misc tree. They are not
UABI yet since they have not merged to the upstream Linux kernel.

Since there has been a reported a performance regression due to the
overhead of sysfs directory creation/teardown during
dma_buf_attach()/dma_buf_detach(), this patch deletes the DMA-BUF
attachment statistics from sysfs.

Fixes: bdb8d06dfe ("dmabuf: Add the capability to expose DMA-BUF stats in sysfs")
Signed-off-by: Hridya Valsaraju <hridya@google.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20210713040742.2680135-1-hridya@google.com
Signed-off-by: Christian König <christian.koenig@amd.com>
2021-07-20 11:06:59 +02:00

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C

/* SPDX-License-Identifier: GPL-2.0-only */
/*
* DMA-BUF sysfs statistics.
*
* Copyright (C) 2021 Google LLC.
*/
#ifndef _DMA_BUF_SYSFS_STATS_H
#define _DMA_BUF_SYSFS_STATS_H
#ifdef CONFIG_DMABUF_SYSFS_STATS
int dma_buf_init_sysfs_statistics(void);
void dma_buf_uninit_sysfs_statistics(void);
int dma_buf_stats_setup(struct dma_buf *dmabuf);
void dma_buf_stats_teardown(struct dma_buf *dmabuf);
#else
static inline int dma_buf_init_sysfs_statistics(void)
{
return 0;
}
static inline void dma_buf_uninit_sysfs_statistics(void) {}
static inline int dma_buf_stats_setup(struct dma_buf *dmabuf)
{
return 0;
}
static inline void dma_buf_stats_teardown(struct dma_buf *dmabuf) {}
#endif
#endif // _DMA_BUF_SYSFS_STATS_H