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[common/client] ivshmem: add portable external frames

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This commit is contained in:
Geoffrey McRae
2026-09-12 09:49:24 +10:00
parent 6d367d4ab2
commit 382f35e503
28 changed files with 946 additions and 227 deletions
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26
common/include/common/ivshmem.h
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@@ -22,26 +22,34 @@
#define _H_LG_COMMON_IVSHMEM_
#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>
typedef enum IVSHMEMCacheMode
{
/* Producers normally use write-combined mappings; consumers use cached.
* Platforms without selectable cache modes ignore this policy. */
IVSHMEM_CACHE_MODE_NONCACHED = 0,
IVSHMEM_CACHE_MODE_CACHED = 1,
IVSHMEM_CACHE_MODE_WRITECOMBINED = 2,
}
IVSHMEMCacheMode;
struct IVSHMEM
{
unsigned int size;
void * mem;
size_t size;
void * mem;
// internal use
void * opaque;
void * opaque;
};
void ivshmemOptionsInit(void);
bool ivshmemInit(struct IVSHMEM * dev);
bool ivshmemOpen(struct IVSHMEM * dev);
bool ivshmemOpenDev(struct IVSHMEM * dev, const char * shmDev);
bool ivshmemOpen(struct IVSHMEM * dev, IVSHMEMCacheMode cacheMode);
bool ivshmemOpenDev(struct IVSHMEM * dev, const char * shmDev,
IVSHMEMCacheMode cacheMode);
void ivshmemClose(struct IVSHMEM * dev);
void ivshmemFree(struct IVSHMEM * dev);
/* Linux KVMFR support only for now (VM->VM) */
bool ivshmemHasDMA (struct IVSHMEM * dev);
int ivshmemGetDMABuf(struct IVSHMEM * dev, uint64_t offset, uint64_t size);
#endif

31
common/include/common/ivshmem_dmabuf.h Normal file
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@@ -0,0 +1,31 @@
/**
* Looking Glass
* Copyright © 2017-2026 The Looking Glass Authors
* https://looking-glass.io
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the Free
* Software Foundation; either version 2 of the License, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc., 59
* Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifndef _H_LG_COMMON_IVSHMEM_DMABUF_
#define _H_LG_COMMON_IVSHMEM_DMABUF_
#include "ivshmem.h"
#include <stdint.h>
bool ivshmemHasDMA (struct IVSHMEM * dev);
int ivshmemGetDMABuf(struct IVSHMEM * dev, uint64_t offset, uint64_t size);
#endif