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// SPDX-License-Identifier: GPL-2.0-only
#include <fcntl.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <linux/limits.h>
#include <libvfio.h>
#define readlink_safe(_path, _buf) ({ \
int __ret; \
\
_Static_assert(!__builtin_types_compatible_p( \
__typeof__(_buf), char *), \
"readlink_safe: _buf must be an array, not a pointer"); \
\
__ret = readlink(_path, _buf, sizeof(_buf) - 1); \
if (__ret != -1) \
_buf[__ret] = 0; \
__ret; \
})
static void readlink_base(const char *path, const char *data_fmt, void *out_data)
{
char rl_path[PATH_MAX];
int ret;
ret = readlink_safe(path, rl_path);
VFIO_ASSERT_NE(ret, -1);
ret = sscanf(basename(rl_path), data_fmt, out_data);
VFIO_ASSERT_EQ(ret, 1);
}
static int sysfs_val_get_int(const char *component, const char *name,
const char *file)
{
char path[PATH_MAX];
char buf[32];
int ret;
int fd;
snprintf_assert(path, PATH_MAX, "/sys/bus/pci/%s/%s/%s", component, name, file);
fd = open(path, O_RDONLY);
if (fd < 0)
return fd;
VFIO_ASSERT_GT(read(fd, buf, ARRAY_SIZE(buf)), 0);
VFIO_ASSERT_EQ(close(fd), 0);
errno = 0;
ret = strtol(buf, NULL, 0);
VFIO_ASSERT_EQ(errno, 0, "sysfs path \"%s\" is not an integer: \"%s\"\n", path, buf);
return ret;
}
static void sysfs_val_set(const char *component, const char *name,
const char *file, const char *val)
{
char path[PATH_MAX];
int fd;
snprintf_assert(path, PATH_MAX, "/sys/bus/pci/%s/%s/%s", component, name, file);
VFIO_ASSERT_GT(fd = open(path, O_WRONLY), 0);
VFIO_ASSERT_EQ(write(fd, val, strlen(val)), strlen(val));
VFIO_ASSERT_EQ(close(fd), 0);
}
static int sysfs_device_val_get(const char *bdf, const char *file)
{
return sysfs_val_get_int("devices", bdf, file);
}
static void sysfs_device_val_set(const char *bdf, const char *file, const char *val)
{
sysfs_val_set("devices", bdf, file, val);
}
static void sysfs_device_val_set_int(const char *bdf, const char *file, int val)
{
char val_str[32];
snprintf_assert(val_str, sizeof(val_str), "%d", val);
sysfs_device_val_set(bdf, file, val_str);
}
int sysfs_sriov_totalvfs_get(const char *bdf)
{
return sysfs_device_val_get(bdf, "sriov_totalvfs");
}
int sysfs_sriov_numvfs_get(const char *bdf)
{
return sysfs_device_val_get(bdf, "sriov_numvfs");
}
void sysfs_sriov_numvfs_set(const char *bdf, int numvfs)
{
sysfs_device_val_set_int(bdf, "sriov_numvfs", numvfs);
}
char *sysfs_sriov_vf_bdf_get(const char *pf_bdf, int i)
{
char path[PATH_MAX];
char *out_vf_bdf;
/* Fit "0000:00:00.0" */
out_vf_bdf = calloc(16, sizeof(char));
VFIO_ASSERT_NOT_NULL(out_vf_bdf);
snprintf_assert(path, PATH_MAX, "/sys/bus/pci/devices/%s/virtfn%d", pf_bdf, i);
readlink_base(path, "%s", out_vf_bdf);
return out_vf_bdf;
}
int sysfs_iommu_group_get(const char *bdf)
{
char path[PATH_MAX];
int group;
snprintf_assert(path, PATH_MAX, "/sys/bus/pci/devices/%s/iommu_group", bdf);
readlink_base(path, "%d", &group);
return group;
}
char *sysfs_driver_get(const char *bdf)
{
char driver_path[PATH_MAX];
char path[PATH_MAX];
char *out_driver;
int ret;
snprintf_assert(path, PATH_MAX, "/sys/bus/pci/devices/%s/driver", bdf);
ret = readlink_safe(path, driver_path);
if (ret == -1) {
if (errno == ENOENT)
return NULL;
VFIO_FAIL("Failed to read %s\n", path);
}
out_driver = strdup(basename(driver_path));
VFIO_ASSERT_NOT_NULL(out_driver);
return out_driver;
}
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