60456261ad
Add the initial support required to share memory buffers between VMs. This driver exposes an interface to userspace clients to request memory to be allocated from another VM, and added to the current VM. The VMs communicate with each other via the use of the hypervisor message queues, as well as utilize various facilities offered by the Haven resource manager to manage memory that is transferred from one VM to another. Change-Id: I3181a1b14e61db30ed6b86752750722e24fd62e0 Signed-off-by: Isaac J. Manjarres <isaacm@codeaurora.org>
70 lines
1.9 KiB
C
70 lines
1.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (c) 2020, The Linux Foundation. All rights reserved.
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*/
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#ifndef _MEM_BUF_H
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#define _MEM_BUF_H
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#include <uapi/linux/mem-buf.h>
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/**
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* struct mem_buf_allocation_data - Data structure that contains information
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* about a memory buffer allocation request.
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* @size: The size (in bytes) of the memory to be requested from a remote VM
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* @nr_acl_entries: The number of ACL entries in @acl_list
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* @acl_list: A list of VMID and permission pairs that describe what VMIDs will
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* have access to the memory, and with what permissions
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* @src_mem_type: The type of memory that the remote VM should allocate
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* (e.g. ION memory)
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* @src_data: A pointer to memory type specific data that the remote VM may need
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* when performing an allocation (e.g. ION memory allocations require a heap ID)
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* @dst_mem_type: The type of memory that the native VM wants (e.g. ION memory)
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* @dst_data: A pointer to memory type specific data that the native VM may
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* need when adding the memory from the remote VM (e.g. ION memory requires a
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* heap ID to add the memory to).
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*/
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struct mem_buf_allocation_data {
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size_t size;
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unsigned int nr_acl_entries;
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struct acl_entry *acl_list;
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enum mem_buf_mem_type src_mem_type;
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void *src_data;
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enum mem_buf_mem_type dst_mem_type;
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void *dst_data;
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};
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#if IS_ENABLED(CONFIG_QCOM_MEM_BUF)
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void *mem_buf_alloc(struct mem_buf_allocation_data *alloc_data);
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int mem_buf_get_fd(void *membuf_desc);
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void mem_buf_put(void *membuf_desc);
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void *mem_buf_get(int fd);
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#else
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static inline void *mem_buf_alloc(struct mem_buf_allocation_data *alloc_data)
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{
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return ERR_PTR(-ENODEV);
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}
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static inline int mem_buf_get_fd(void *membuf_desc)
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{
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return -ENODEV;
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}
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static inline void mem_buf_put(void *membuf_desc)
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{
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}
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static inline void *mem_buf_get(int fd)
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{
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return ERR_PTR(-ENODEV);
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}
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#endif /* CONFIG_QCOM_MEM_BUF */
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#endif /* _MEM_BUF_H */
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