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mem-buf: Take a snapshot of mem-buf-exporter.h from msm-5.15

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Take a snapshot of the qcom-dma-mapping.h header as of commit
f843a80d2c45 ("Merge "defconfig: gen3auto: Separated if_changed"") on
msm-5.15, excluding any Gunyah references (as the Gunyah driver has
yet to be ported).

Change-Id: I0549feb28eedb80668f1233576c365aefc3a8e6e
Signed-off-by: Chris Goldsworthy <quic_cgoldswo@quicinc.com>
This commit is contained in:
Chris Goldsworthy 2022-04-27 20:35:23 -07:00
parent f79070bcf8
commit e117a3efa4
1 changed files with 111 additions and 0 deletions
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include/linux/mem-buf-exporter.h Normal file
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/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Copyright (c) 2020-2021, The Linux Foundation. All rights reserved.
*/
#ifndef _MEM_BUF_EXPORTER_H
#define _MEM_BUF_EXPORTER_H
#include <linux/dma-buf.h>
#include <soc/qcom/secure_buffer.h>
int mem_buf_dma_buf_attach(struct dma_buf *dmabuf,
struct dma_buf_attachment *attachment);
/* Private data for managing a dmabuf's Virtual Machine permissions. */
struct mem_buf_vmperm;
/*
* @lookup: Returns the mem_buf_vmperm data structure contained somewhere
* in the exporter's private_data, or a negative number on error.
* @attach: The exporter's normal dma_buf_attach callback
* @dma_ops: The exporter's standard dma_buf callbacks, except for
* attach which must be NULL.
*/
struct mem_buf_dma_buf_ops {
struct mem_buf_vmperm *(*lookup)(struct dma_buf *dmabuf);
int (*attach)(struct dma_buf *dmabuf, struct dma_buf_attachment *a);
struct dma_buf_ops dma_ops;
};
struct dma_buf *
mem_buf_dma_buf_export(struct dma_buf_export_info *exp_info,
struct mem_buf_dma_buf_ops *ops);
#define MEM_BUF_WRAPPER_FLAG_STATIC_VM BIT(0)
#define MEM_BUF_WRAPPER_FLAG_LENDSHARE BIT(1)
#define MEM_BUF_WRAPPER_FLAG_ACCEPT BIT(2)
#define MEM_BUF_WRAPPER_FLAG_ERR BIT(3)
/*
* A dmabuf owned by the current VM with RWX permissions.
* All variants should be free'd via mem_buf_vmperm_free().
*
* @dmabuf: value returned from dma_buf_export()
* @sgt: Reference to the exporter's internal memory descriptor.
* Will not be freed by mem_buf_vmperm_free().
*/
struct mem_buf_vmperm *mem_buf_vmperm_alloc(struct sg_table *sgt);
/*
* A dmabuf which permantently belongs to the given VMs & permissions.
*/
struct mem_buf_vmperm *mem_buf_vmperm_alloc_staticvm(struct sg_table *sgt, int *vmids, int *perms,
u32 nr_acl_entries);
/*
* Performs the expected close step based on whether the dmabuf
* is of the "STATICVM" "MEMACCEPT" or "DEFAULT" type.
* Exporters should call this from dma_buf_release. If this function
* Returns an error, exporters should consider the underlying memory
* to have undefined permissions.
*/
int mem_buf_vmperm_release(struct mem_buf_vmperm *vmperm);
/*
* Pins ths permissions of the dmabuf.
* The exporter should call this from dma_buf_mmap, vm_ops->open(), and
* dma_buf_map_attachment. It must not be called from
* dma_buf_begin_cpu_access as userspace may call this function unsafely
* via DMA_BUF_IOCTL_SYNC.
*/
void mem_buf_vmperm_pin(struct mem_buf_vmperm *vmperm);
/*
* Unpins ths permissions of the dmabuf.
* The exporter should call this from vm_ops->close(), and
* dma_buf_unmap_attachment. It must not be called from
* dma_buf_end_cpu_access as userspace may call this function unsafely
* via DMA_BUF_IOCTL_SYNC.
*/
void mem_buf_vmperm_unpin(struct mem_buf_vmperm *vmperm);
/*
* Check whether the current permissions of the dmabuf allow CMO.
* Requires RW.
*
* The exporter should call this during dma_buf_map/unmap_attachment,
* and dma_buf_begin/end_cpu_access.
*/
bool mem_buf_vmperm_can_cmo(struct mem_buf_vmperm *vmperm);
/*
* Check whether the current permissions of the dmabuf allow mmap.
* Requires at minimum the permissions specified in vma.
*
* The exporter should call mem_buf_vmperm_pin() from mmap.
* The exporter should implement the open() and close() operations of
* vma->vm_ops, and call mem_buf_vmperm_pin()/unpin() respectively.
*/
bool mem_buf_vmperm_can_mmap(struct mem_buf_vmperm *vmperm, struct vm_area_struct *vma);
/*
* Check whether the current permissions of the dmabuf allow vmap.
* Requires RW.
*
* The exporter should call this during dma_buf_vmap,
*/
bool mem_buf_vmperm_can_vmap(struct mem_buf_vmperm *vmperm);
#endif /*_MEM_BUF_EXPORTER_H */