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[common] linux: added support for kvmfr dmabuf

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This commit is contained in:
Geoffrey McRae
2020-10-29 21:51:16 +11:00
parent 5081c3ea88
commit 0efe7dc63c
2 changed files with 50 additions and 106 deletions
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1
common/src/platform/linux/CMakeLists.txt
View File

@@ -3,6 +3,7 @@ project(lg_common_platform_code LANGUAGES C)
include_directories(
${PROJECT_SOURCE_DIR}/include
${PROJECT_TOP}
)
add_library(lg_common_platform_code STATIC

155
common/src/platform/linux/ivshmem.c
View File

@@ -25,6 +25,7 @@ Place, Suite 330, Boston, MA 02111-1307 USA
#include <unistd.h>
#include <sys/stat.h>
#include <sys/mman.h>
#include <sys/ioctl.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
@@ -32,58 +33,19 @@ Place, Suite 330, Boston, MA 02111-1307 USA
#include "common/debug.h"
#include "common/option.h"
#include "common/stringutils.h"
#include "module/kvmfr.h"
struct IVSHMEMInfo
{
int fd;
int devFd;
int dmaFd;
int size;
};
static int uioOpenFile(const char * shmDevice, const char * file)
{
char * path;
alloc_sprintf(&path, "/sys/class/uio/%s/%s", shmDevice, file);
int fd = open(path, O_RDONLY);
if (fd < 0)
{
free(path);
return -1;
}
free(path);
return fd;
}
static char * uioGetName(const char * shmDevice)
{
int fd = uioOpenFile(shmDevice, "name");
if (fd < 0)
return NULL;
char * name = malloc(32);
int len = read(fd, name, 31);
if (len <= 0)
{
free(name);
close(fd);
return NULL;
}
name[len] = '\0';
close(fd);
while(len > 0 && name[len-1] == '\n')
{
--len;
name[len] = '\0';
}
return name;
}
static bool ivshmemDeviceValidator(struct Option * opt, const char ** error)
{
// if it's not a uio device, it must be a file on disk
if (strlen(opt->value.x_string) > 3 && memcmp(opt->value.x_string, "uio", 3) != 0)
// if it's not a kvmfr device, it must be a file on disk
if (strlen(opt->value.x_string) > 3 && memcmp(opt->value.x_string, "kvmfr", 5) != 0)
{
struct stat st;
if (stat(opt->value.x_string, &st) != 0)
@@ -94,21 +56,6 @@ static bool ivshmemDeviceValidator(struct Option * opt, const char ** error)
return true;
}
char * name = uioGetName(opt->value.x_string);
if (!name)
{
*error = "Failed to get the uio device name";
return false;
}
if (strcmp(name, "KVMFR") != 0)
{
free(name);
*error = "Device is not a KVMFR device";
return false;
}
free(name);
return true;
}
@@ -116,7 +63,7 @@ static StringList ivshmemDeviceGetValues(struct Option * option)
{
StringList sl = stringlist_new(true);
DIR * d = opendir("/sys/class/uio");
DIR * d = opendir("/sys/class/kvmfr");
if (!d)
return sl;
@@ -126,18 +73,9 @@ static StringList ivshmemDeviceGetValues(struct Option * option)
if (dir->d_name[0] == '.')
continue;
char * name = uioGetName(dir->d_name);
if (!name)
continue;
if (strcmp(name, "KVMFR") == 0)
{
char * devName;
alloc_sprintf(&devName, "/dev/%s", dir->d_name);
stringlist_push(sl, devName);
}
free(name);
char * devName;
alloc_sprintf(&devName, "/dev/%s", dir->d_name);
stringlist_push(sl, devName);
}
closedir(d);
@@ -152,7 +90,7 @@ void ivshmemOptionsInit()
.module = "app",
.name = "shmFile",
.shortopt = 'f',
.description = "The path to the shared memory file, or the name of the uio device to use, ie: uio0",
.description = "The path to the shared memory file, or the name of the kvmfr device to use, ie: kvmfr0",
.type = OPTION_TYPE_STRING,
.value.x_string = "/dev/shm/looking-glass",
.validator = ivshmemDeviceValidator,
@@ -174,44 +112,42 @@ bool ivshmemOpenDev(struct IVSHMEM * dev, const char * shmDevice)
assert(dev);
unsigned int devSize;
int devFD;
int devFd = -1;
int dmaFd = -1;
int mapFd = -1;
dev->opaque = NULL;
DEBUG_INFO("KVMFR Device : %s", shmDevice);
if (strlen(shmDevice) > 8 && memcmp(shmDevice, "/dev/uio", 8) == 0)
if (strlen(shmDevice) > 8 && memcmp(shmDevice, "/dev/kvmfr", 10) == 0)
{
const char * uioDev = shmDevice + 5;
// get the device size
int fd = uioOpenFile(uioDev, "maps/map0/size");
if (fd < 0)
{
DEBUG_ERROR("Failed to open %s/size", uioDev);
return false;
}
char size[32];
int len = read(fd, size, sizeof(size) - 1);
if (len <= 0)
{
DEBUG_ERROR("Failed to read the device size");
DEBUG_ERROR("%s", strerror(errno));
close(fd);
return false;
}
size[len] = '\0';
close(fd);
devSize = strtoul(size, NULL, 16);
devFD = open(shmDevice, O_RDWR, (mode_t)0600);
if (devFD < 0)
devFd = open(shmDevice, O_RDWR, (mode_t)0600);
if (devFd < 0)
{
DEBUG_ERROR("Failed to open: %s", shmDevice);
DEBUG_ERROR("%s", strerror(errno));
return false;
}
// get the device size
devSize = ioctl(devFd, KVMFR_DMABUF_GETSIZE, 0);
const struct kvmfr_dmabuf_create create =
{
.flags = KVMFR_DMABUF_FLAG_CLOEXEC,
.offset = 0x0,
.size = devSize
};
dmaFd = ioctl(devFd, KVMFR_DMABUF_CREATE, &create);
if (dmaFd < 0)
{
DEBUG_ERROR("Failed to create the dma buffer");
close(devFd);
return false;
}
mapFd = dmaFd;
}
else
{
@@ -224,16 +160,18 @@ bool ivshmemOpenDev(struct IVSHMEM * dev, const char * shmDevice)
}
devSize = st.st_size;
devFD = open(shmDevice, O_RDWR, (mode_t)0600);
if (devFD < 0)
devFd = open(shmDevice, O_RDWR, (mode_t)0600);
if (devFd < 0)
{
DEBUG_ERROR("Failed to open: %s", shmDevice);
DEBUG_ERROR("%s", strerror(errno));
return false;
}
mapFd = devFd;
}
void * map = mmap(0, devSize, PROT_READ | PROT_WRITE, MAP_SHARED, devFD, 0);
void * map = mmap(0, devSize, PROT_READ | PROT_WRITE, MAP_SHARED, mapFd, 0);
if (map == MAP_FAILED)
{
DEBUG_ERROR("Failed to map the shared memory device: %s", shmDevice);
@@ -243,8 +181,9 @@ bool ivshmemOpenDev(struct IVSHMEM * dev, const char * shmDevice)
struct IVSHMEMInfo * info =
(struct IVSHMEMInfo *)malloc(sizeof(struct IVSHMEMInfo));
info->size = devSize;
info->fd = devFD;
info->size = devSize;
info->devFd = devFd;
info->dmaFd = dmaFd;
dev->opaque = info;
dev->size = devSize;
@@ -263,7 +202,11 @@ void ivshmemClose(struct IVSHMEM * dev)
(struct IVSHMEMInfo *)dev->opaque;
munmap(dev->mem, info->size);
close(info->fd);
if (info->dmaFd >= 0)
close(info->dmaFd);
close(info->devFd);
free(info);
dev->mem = NULL;