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libvirt/tests/virpcimock.c
Michal Privoznik b7e6513a01 tests: mock __open_2() 
As of commit [1] glibc may overwrite a call to open() with call
to __open_2() (if only two arguments are provided and the code is
compiled with clang). But since we are not mocking the latter our
test suite is broken as tests try to access paths outside of our
repo.

1: https://sourceware.org/git/?p=glibc.git;a=commit;h=86889e22db329abac618c6a41f86c84657a15324
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Pavel Hrdina <phrdina@redhat.com>
2024-03-14 15:17:48 +01:00

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/*
* Copyright (C) 2013 Red Hat, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see
* <http://www.gnu.org/licenses/>.
*/
#include <config.h>
#define LIBVIRT_VIRPCIVPDPRIV_H_ALLOW
#include "virpcivpdpriv.h"
#if defined(__linux__) || defined(__FreeBSD__) || defined(__APPLE__)
# define VIR_MOCK_LOOKUP_MAIN
# include "virmock.h"
# include "virpci.h"
# include <unistd.h>
# include <fcntl.h>
# include <sys/stat.h>
# include <stdarg.h>
# include <dirent.h>
# include "viralloc.h"
# include "virfile.h"
static int (*real_access)(const char *path, int mode);
static int (*real_open)(const char *path, int flags, ...);
# if WITH___OPEN_2
static int (*real___open_2)(const char *path, int flags);
# endif /* ! WITH___OPEN_2 */
static int (*real_close)(int fd);
static DIR * (*real_opendir)(const char *name);
static char *(*real_virFileCanonicalizePath)(const char *path);
static char *fakerootdir;
/* To add a new mocked prefix in virpcimock:
* - add the prefix here as a define to make it easier to track what we
* are mocking;
* - add it to the 'pathPrefixIsMocked()' helper;
* - (optional) edit 'getrealpath()' if you need the resulting mocked
* path to be different than <fakerootdir>/path
*/
# define SYSFS_PCI_PREFIX "/sys/bus/pci/"
# define SYSFS_KERNEL_PREFIX "/sys/kernel/"
# define DEV_VFIO_PREFIX "/dev/vfio/"
# define STDERR(...) \
fprintf(stderr, "%s %zu: ", __FUNCTION__, (size_t) __LINE__); \
fprintf(stderr, __VA_ARGS__); \
fprintf(stderr, "\n"); \
# define ABORT(...) \
do { \
STDERR(__VA_ARGS__); \
abort(); \
} while (0)
# define ABORT_OOM() \
ABORT("Out of memory")
/*
* The plan:
*
* Mock some file handling functions. Redirect them into a stub tree passed via
* LIBVIRT_FAKE_ROOT_DIR env variable. All files and links within stub tree is
* created by us. There are some actions that we must take if some special
* files are written to. Here's the list of files we watch:
*
* /sys/bus/pci/drivers/<driver>/bind
* Check if driver supports the device and bind driver to it (create symlink
* called 'driver' pointing to the /sys/but/pci/drivers/<driver>).
* Data in format "DDDD:BB:DD.F" (Domain:Bus:Device.Function).
*
* /sys/bus/pci/drivers/<driver>/unbind
* Unbind driver from the device.
* Data in format "DDDD:BB:DD.F" (Domain:Bus:Device.Function).
*
* /sys/bus/pci/drivers_probe
* Probe for a driver that handles the specified device.
* Data in format "DDDD:BB:DD.F" (Domain:Bus:Device.Function).
*
* /sys/bus/pci/devices/<device>/driver_override
* Name of a driver that overrides preferred driver can be written
* here. The device will be attached to it on drivers_probe event.
* Writing an empty string (or "\n") clears the override.
*
* As a little hack, we are not mocking write to these files, but close()
* instead. The advantage is we don't need any self growing array to hold the
* partial writes and construct them back. We can let all the writes finish,
* and then just read the file content back.
*/
/*
*
* Functions to model kernel behavior
*
*/
struct pciDriver {
char *name;
int *vendor; /* List of vendor:device IDs the driver can handle */
int *device;
size_t len; /* @len is used for both @vendor and @device */
};
struct pciIommuGroup {
int iommu;
size_t nDevicesBoundToVFIO; /* Indicates the devices in the group */
};
struct pciDeviceAddress {
unsigned int domain;
unsigned int bus;
unsigned int device;
unsigned int function;
};
# define ADDR_STR_FMT "%04x:%02x:%02x.%u"
struct pciVPD {
/* PCI VPD contents (binary, may contain NULLs), NULL if not present. */
const char *data;
/* VPD length in bytes. */
size_t vpd_len;
};
struct pciDevice {
struct pciDeviceAddress addr;
int vendor;
int device;
int klass;
int iommuGroup;
const char *physfn;
struct pciDriver *driver; /* Driver attached. NULL if attached to no driver */
struct pciVPD vpd;
};
struct fdCallback {
int fd;
char *path;
};
struct pciDevice **pciDevices = NULL;
size_t nPCIDevices = 0;
struct pciDriver **pciDrivers = NULL;
size_t nPCIDrivers = 0;
struct pciIommuGroup **pciIommuGroups = NULL;
size_t npciIommuGroups = 0;
struct fdCallback *callbacks = NULL;
size_t nCallbacks = 0;
static void init_env(void);
static int pci_device_autobind(struct pciDevice *dev);
static void pci_device_new_from_stub(const struct pciDevice *data);
static struct pciDevice *pci_device_find_by_id(struct pciDeviceAddress const *addr);
static struct pciDevice *pci_device_find_by_content(const char *path);
static void pci_driver_new(const char *name, ...);
static struct pciDriver *pci_driver_find_by_dev(struct pciDevice *dev);
static struct pciDriver *pci_driver_find_by_path(const char *path);
static struct pciDriver *pci_driver_find_by_driver_override(struct pciDevice *dev);
static int pci_driver_bind(struct pciDriver *driver, struct pciDevice *dev);
static int pci_driver_unbind(struct pciDriver *driver, struct pciDevice *dev);
static int pci_driver_handle_change(int fd, const char *path);
static int pci_driver_handle_bind(const char *path);
static int pci_driver_handle_unbind(const char *path);
/*
* Helper functions
*/
static void
make_file(const char *path,
const char *name,
const char *value,
ssize_t len)
{
VIR_AUTOCLOSE fd = -1;
g_autofree char *filepath = NULL;
if (value && len == -1)
len = strlen(value);
filepath = g_strdup_printf("%s/%s", path, name);
if ((fd = real_open(filepath, O_CREAT|O_WRONLY, 0666)) < 0)
ABORT("Unable to open: %s", filepath);
if (value && safewrite(fd, value, len) != len)
ABORT("Unable to write: %s", filepath);
}
static void
make_dir(const char *path,
const char *name)
{
g_autofree char *dirpath = NULL;
dirpath = g_strdup_printf("%s/%s", path, name);
if (g_mkdir_with_parents(dirpath, 0777) < 0)
ABORT("Unable to create: %s", dirpath);
}
static void
make_symlink(const char *path,
const char *name,
const char *target)
{
g_autofree char *filepath = NULL;
filepath = g_strdup_printf("%s/%s", path, name);
if (symlink(target, filepath) < 0)
ABORT("Unable to create symlink filepath -> target");
}
static int
pci_read_file(const char *path,
char *buf,
size_t buf_size,
bool truncate)
{
int ret = -1;
int fd = -1;
g_autofree char *newpath = NULL;
newpath = g_strdup_printf("%s/%s", fakerootdir, path);
if ((fd = real_open(newpath, O_RDWR)) < 0)
goto cleanup;
memset(buf, 0, buf_size);
if (saferead(fd, buf, buf_size - 1) < 0) {
STDERR("Unable to read from %s", newpath);
goto cleanup;
}
if (truncate &&
ftruncate(fd, 0) < 0)
goto cleanup;
ret = 0;
cleanup:
real_close(fd);
return ret;
}
static bool
pathPrefixIsMocked(const char *path)
{
return STRPREFIX(path, SYSFS_PCI_PREFIX) ||
STRPREFIX(path, SYSFS_KERNEL_PREFIX) ||
STRPREFIX(path, DEV_VFIO_PREFIX);
}
static int
getrealpath(char **newpath,
const char *path)
{
if (!fakerootdir && pathPrefixIsMocked(path))
init_env();
if (STRPREFIX(path, SYSFS_PCI_PREFIX)) {
*newpath = g_strdup_printf("%s/sys/bus/pci/%s",
fakerootdir,
path + strlen(SYSFS_PCI_PREFIX));
} else if (pathPrefixIsMocked(path)) {
*newpath = g_strdup_printf("%s/%s",
fakerootdir,
path);
} else {
*newpath = g_strdup(path);
}
return 0;
}
static bool
find_fd(int fd, size_t *indx)
{
size_t i;
for (i = 0; i < nCallbacks; i++) {
if (callbacks[i].fd == fd) {
if (indx)
*indx = i;
return true;
}
}
return false;
}
static int
add_fd(int fd, const char *path)
{
size_t i;
if (find_fd(fd, &i)) {
struct fdCallback cb = callbacks[i];
ABORT("FD %d %s already present in the array as %d %s",
fd, path, cb.fd, cb.path);
}
callbacks = g_renew(struct fdCallback, callbacks, nCallbacks + 1);
callbacks[nCallbacks].path = g_strdup(path);
callbacks[nCallbacks++].fd = fd;
return 0;
}
static int
remove_fd(int fd)
{
size_t i;
if (find_fd(fd, &i)) {
struct fdCallback cb = callbacks[i];
if (pci_driver_handle_change(cb.fd, cb.path) < 0)
return -1;
VIR_FREE(cb.path);
if (VIR_DELETE_ELEMENT(callbacks, i, nCallbacks) < 0) {
errno = EINVAL;
return -1;
}
}
return 0;
}
/*
* PCI Device functions
*/
static char *
pci_address_format(struct pciDeviceAddress const *addr)
{
return g_strdup_printf(ADDR_STR_FMT, addr->domain, addr->bus,
addr->device, addr->function);
}
static int
pci_address_parse(struct pciDeviceAddress *addr,
const char *buf)
{
if (sscanf(buf, ADDR_STR_FMT,
&addr->domain, &addr->bus,
&addr->device, &addr->function) != 4)
return -1;
return 0;
}
static char *
pci_device_get_path(const struct pciDevice *dev,
const char *file,
bool faked)
{
char *ret = NULL;
const char *prefix = "";
g_autofree char *devid = NULL;
if (faked)
prefix = fakerootdir;
if (!(devid = pci_address_format(&dev->addr)))
return NULL;
/* PCI devices really do live under /sys/devices/pciDDDD:BB
* and then they are just symlinked to /sys/bus/pci/devices/
*/
if (file) {
ret = g_strdup_printf("%s/sys/devices/pci%04x:%02x/%s/%s",
prefix, dev->addr.domain, dev->addr.bus,
devid, file);
} else {
ret = g_strdup_printf("%s/sys/devices/pci%04x:%02x/%s",
prefix, dev->addr.domain, dev->addr.bus,
devid);
}
return ret;
}
static void
pci_device_create_iommu(const struct pciDevice *dev,
const char *devid)
{
struct pciIommuGroup *iommuGroup;
g_autofree char *iommuPath = NULL;
char tmp[256];
size_t i;
iommuPath = g_strdup_printf("%s/sys/kernel/iommu_groups/%d/devices/",
fakerootdir, dev->iommuGroup);
if (g_mkdir_with_parents(iommuPath, 0777) < 0)
ABORT("Unable to create: %s", iommuPath);
if (g_snprintf(tmp, sizeof(tmp),
"../../../../devices/pci%04x:%02x/%s",
dev->addr.domain, dev->addr.bus, devid) < 0) {
ABORT("@tmp overflow");
}
make_symlink(iommuPath, devid, tmp);
/* pci_device_create_iommu can be called more than one for the
* same iommuGroup. Bail out here if the iommuGroup was already
* created beforehand. */
for (i = 0; i < npciIommuGroups; i++) {
if (pciIommuGroups[i]->iommu == dev->iommuGroup)
return;
}
iommuGroup = g_new0(struct pciIommuGroup, 1);
iommuGroup->iommu = dev->iommuGroup;
iommuGroup->nDevicesBoundToVFIO = 0; /* No device bound to VFIO by default */
VIR_APPEND_ELEMENT(pciIommuGroups, npciIommuGroups, iommuGroup);
}
static void
pci_device_new_from_stub(const struct pciDevice *data)
{
struct pciDevice *dev;
g_autofree char *devpath = NULL;
g_autofree char *devsympath = NULL;
g_autofree char *id = NULL;
g_autofree char *devid = NULL;
char *c;
g_autofree char *configSrc = NULL;
char tmp[256];
struct stat sb;
bool configSrcExists = false;
if (!(devid = pci_address_format(&data->addr)))
ABORT_OOM();
id = g_strdup(devid);
/* Replace ':' with '-' to create the config filename from the
* device ID. The device ID cannot be used directly as filename
* because it contains ':' and Windows does not allow ':' in
* filenames. */
c = strchr(id, ':');
while (c) {
*c = '-';
c = strchr(c, ':');
}
dev = g_new0(struct pciDevice, 1);
configSrc = g_strdup_printf("%s/virpcitestdata/%s.config", abs_srcdir, id);
memcpy(dev, data, sizeof(*dev));
if (!(devpath = pci_device_get_path(dev, NULL, true)))
ABORT_OOM();
if (g_mkdir_with_parents(devpath, 0777) < 0)
ABORT("Unable to create: %s", devpath);
if (stat(configSrc, &sb) == 0)
configSrcExists = true;
/* If there is a config file for the device within virpcitestdata dir,
* symlink it. Otherwise create a dummy config file. */
if (configSrcExists) {
/* On success, copy @configSrc into the destination (a copy,
* rather than a symlink, is required since we write into the
* file, and parallel VPATH builds must not stomp on the
* original; besides, 'make distcheck' requires the original
* to be read-only */
g_autofree char *buf = NULL;
ssize_t len;
if ((len = virFileReadAll(configSrc, 4096, &buf)) < 0)
ABORT("Unable to read config file '%s'", configSrc);
make_file(devpath, "config", buf, len);
} else {
/* If there's no config data in the virpcitestdata dir, create a dummy
* config file */
make_file(devpath, "config", "some dummy config", -1);
}
if (g_snprintf(tmp, sizeof(tmp), "0x%.4x", dev->vendor) < 0)
ABORT("@tmp overflow");
make_file(devpath, "vendor", tmp, -1);
if (g_snprintf(tmp, sizeof(tmp), "0x%.4x", dev->device) < 0)
ABORT("@tmp overflow");
make_file(devpath, "device", tmp, -1);
if (g_snprintf(tmp, sizeof(tmp), "0x%.4x", dev->klass) < 0)
ABORT("@tmp overflow");
make_file(devpath, "class", tmp, -1);
make_file(devpath, "driver_override", NULL, -1);
pci_device_create_iommu(dev, devid);
if (g_snprintf(tmp, sizeof(tmp),
"../../../kernel/iommu_groups/%d", dev->iommuGroup) < 0) {
ABORT("@tmp overflow");
}
make_symlink(devpath, "iommu_group", tmp);
if (g_snprintf(tmp, sizeof(tmp),
"../../../devices/pci%04x:%02x/%s",
dev->addr.domain, dev->addr.bus, devid) < 0) {
ABORT("@tmp overflow");
}
devsympath = g_strdup_printf("%s" SYSFS_PCI_PREFIX "devices", fakerootdir);
make_symlink(devsympath, devid, tmp);
if (dev->physfn) {
if (g_snprintf(tmp, sizeof(tmp),
"%s%s/devices/%s", fakerootdir,
SYSFS_PCI_PREFIX, dev->physfn) < 0) {
ABORT("@tmp overflow");
}
make_symlink(devpath, "physfn", tmp);
}
if (dev->vpd.data && dev->vpd.vpd_len)
make_file(devpath, "vpd", dev->vpd.data, dev->vpd.vpd_len);
if (pci_device_autobind(dev) < 0)
ABORT("Unable to bind: %s", devid);
VIR_APPEND_ELEMENT(pciDevices, nPCIDevices, dev);
}
static struct pciDevice *
pci_device_find_by_id(struct pciDeviceAddress const *addr)
{
size_t i;
for (i = 0; i < nPCIDevices; i++) {
struct pciDevice *dev = pciDevices[i];
if (!memcmp(&dev->addr, addr, sizeof(*addr)))
return dev;
}
return NULL;
}
static struct pciDevice *
pci_device_find_by_content(const char *path)
{
char tmp[32];
struct pciDeviceAddress addr;
if (pci_read_file(path, tmp, sizeof(tmp), true) < 0 ||
pci_address_parse(&addr, tmp) < 0)
return NULL;
return pci_device_find_by_id(&addr);
}
static int
pci_device_autobind(struct pciDevice *dev)
{
struct pciDriver *driver = pci_driver_find_by_driver_override(dev);
if (!driver)
driver = pci_driver_find_by_dev(dev);
if (!driver) {
/* No driver found. Nothing to do */
return 0;
}
return pci_driver_bind(driver, dev);
}
static int
pci_vfio_release_iommu(struct pciDevice *device)
{
g_autofree char *vfiopath = NULL;
size_t i = 0;
for (i = 0; i < npciIommuGroups; i++) {
if (device->iommuGroup != pciIommuGroups[i]->iommu)
continue;
if (pciIommuGroups[i]->nDevicesBoundToVFIO == 0) {
errno = EXDEV;
return -1;
}
pciIommuGroups[i]->nDevicesBoundToVFIO--;
if (!pciIommuGroups[i]->nDevicesBoundToVFIO) {
vfiopath = g_strdup_printf("%s/dev/vfio/%d",
fakerootdir,
device->iommuGroup);
if (unlink(vfiopath) < 0)
return -1;
}
break;
}
return 0;
}
static int
pci_vfio_lock_iommu(struct pciDevice *device)
{
g_autofree char *vfiopath = NULL;
int ret = -1;
size_t i = 0;
int fd = -1;
for (i = 0; i < npciIommuGroups; i++) {
if (device->iommuGroup != pciIommuGroups[i]->iommu)
continue;
if (pciIommuGroups[i]->nDevicesBoundToVFIO == 0) {
vfiopath = g_strdup_printf("%s/dev/vfio/%d",
fakerootdir,
device->iommuGroup);
if ((fd = real_open(vfiopath, O_CREAT)) < 0)
goto cleanup;
}
pciIommuGroups[i]->nDevicesBoundToVFIO++;
break;
}
ret = 0;
cleanup:
if (fd != -1)
real_close(fd);
return ret;
}
/*
* PCI Driver functions
*/
static char *
pci_driver_get_path(const struct pciDriver *driver,
const char *file,
bool faked)
{
char *ret = NULL;
const char *prefix = "";
if (faked)
prefix = fakerootdir;
if (file) {
ret = g_strdup_printf("%s" SYSFS_PCI_PREFIX "drivers/%s/%s",
prefix, driver->name, file);
} else {
ret = g_strdup_printf("%s" SYSFS_PCI_PREFIX "drivers/%s",
prefix, driver->name);
}
return ret;
}
static void
pci_driver_new(const char *name, ...)
{
struct pciDriver *driver;
va_list args;
int vendor, device;
g_autofree char *driverpath = NULL;
driver = g_new0(struct pciDriver, 1);
driver->name = g_strdup(name);
if (!(driverpath = pci_driver_get_path(driver, NULL, true)))
ABORT_OOM();
if (g_mkdir_with_parents(driverpath, 0777) < 0)
ABORT("Unable to create: %s", driverpath);
va_start(args, name);
while ((vendor = va_arg(args, int)) != -1) {
if ((device = va_arg(args, int)) == -1)
ABORT("Invalid vendor device pair for driver %s", name);
driver->vendor = g_renew(int, driver->vendor, driver->len + 1);
driver->vendor[driver->len] = vendor;
driver->device = g_renew(int, driver->device, driver->len + 1);
driver->device[driver->len] = device;
driver->len++;
}
va_end(args);
make_file(driverpath, "bind", NULL, -1);
make_file(driverpath, "unbind", NULL, -1);
VIR_APPEND_ELEMENT(pciDrivers, nPCIDrivers, driver);
}
static struct pciDriver *
pci_driver_find_by_dev(struct pciDevice *dev)
{
size_t i;
for (i = 0; i < nPCIDrivers; i++) {
struct pciDriver *driver = pciDrivers[i];
size_t j;
for (j = 0; j < driver->len; j++) {
if (driver->vendor[j] == dev->vendor &&
driver->device[j] == dev->device)
return driver;
}
}
return NULL;
}
static struct pciDriver *
pci_driver_find_by_path(const char *path)
{
size_t i;
for (i = 0; i < nPCIDrivers; i++) {
struct pciDriver *driver = pciDrivers[i];
if (strstr(path, driver->name))
return driver;
}
return NULL;
}
static struct pciDriver *
pci_driver_find_by_driver_override(struct pciDevice *dev)
{
g_autofree char *path = NULL;
char tmp[32];
size_t i;
if (!(path = pci_device_get_path(dev, "driver_override", false)))
return NULL;
if (pci_read_file(path, tmp, sizeof(tmp), false) < 0)
return NULL;
for (i = 0; i < nPCIDrivers; i++) {
struct pciDriver *driver = pciDrivers[i];
if (STREQ(tmp, driver->name))
return driver;
}
return NULL;
}
static int
pci_driver_bind(struct pciDriver *driver,
struct pciDevice *dev)
{
g_autofree char *devid = NULL;
g_autofree char *devpath = NULL;
g_autofree char *driverpath = NULL;
if (dev->driver) {
/* Device already bound */
errno = ENODEV;
return -1;
}
/* Make symlink under device tree */
if (!(devpath = pci_device_get_path(dev, "driver", true)) ||
!(driverpath = pci_driver_get_path(driver, NULL, true))) {
errno = ENOMEM;
return -1;
}
if (symlink(driverpath, devpath) < 0)
return -1;
/* Make symlink under driver tree */
VIR_FREE(devpath);
VIR_FREE(driverpath);
if (!(devid = pci_address_format(&dev->addr)) ||
!(devpath = pci_device_get_path(dev, NULL, true)) ||
!(driverpath = pci_driver_get_path(driver, devid, true))) {
errno = ENOMEM;
return -1;
}
if (symlink(devpath, driverpath) < 0)
return -1;
if (STREQ(driver->name, "vfio-pci") &&
pci_vfio_lock_iommu(dev) < 0)
return -1;
dev->driver = driver;
return 0;
}
static int
pci_driver_unbind(struct pciDriver *driver,
struct pciDevice *dev)
{
g_autofree char *devid = NULL;
g_autofree char *devpath = NULL;
g_autofree char *driverpath = NULL;
if (dev->driver != driver) {
/* Device not bound to the @driver */
errno = ENODEV;
return -1;
}
/* Make symlink under device tree */
if (!(devid = pci_address_format(&dev->addr)) ||
!(devpath = pci_device_get_path(dev, "driver", true)) ||
!(driverpath = pci_driver_get_path(driver, devid, true))) {
errno = ENOMEM;
return -1;
}
if (unlink(devpath) < 0 ||
unlink(driverpath) < 0)
return -1;
if (STREQ(driver->name, "vfio-pci") &&
pci_vfio_release_iommu(dev) < 0)
return -1;
dev->driver = NULL;
return 0;
}
static int
pci_driver_handle_drivers_probe(const char *path)
{
struct pciDevice *dev;
if (!(dev = pci_device_find_by_content(path))) {
errno = ENODEV;
return -1;
}
if (dev->driver)
return 0;
return pci_device_autobind(dev);
}
static int
pci_driver_handle_change(int fd G_GNUC_UNUSED, const char *path)
{
int ret;
g_autofree char *file = g_path_get_basename(path);
if (STREQ(file, "bind"))
ret = pci_driver_handle_bind(path);
else if (STREQ(file, "unbind"))
ret = pci_driver_handle_unbind(path);
else if (STREQ(file, "drivers_probe"))
ret = pci_driver_handle_drivers_probe(path);
else if (STREQ(file, "driver_override"))
ret = 0; /* nada */
else
ABORT("Not handled write to: %s", path);
return ret;
}
static int
pci_driver_handle_bind(const char *path)
{
struct pciDevice *dev = pci_device_find_by_content(path);
struct pciDriver *driver = pci_driver_find_by_path(path);
if (!driver || !dev) {
/* No driver, no device or failing driver requested */
errno = ENODEV;
return -1;
}
return pci_driver_bind(driver, dev);
}
static int
pci_driver_handle_unbind(const char *path)
{
struct pciDevice *dev = pci_device_find_by_content(path);
if (!dev || !dev->driver) {
/* No device, device not binded or failing driver requested */
errno = ENODEV;
return -1;
}
return pci_driver_unbind(dev->driver, dev);
}
int
virPCIDeviceFindBestVFIOVariant(virPCIDevice *dev G_GNUC_UNUSED,
char **moduleName G_GNUC_UNUSED)
{
return 0;
}
/*
* Functions to load the symbols and init the environment
*/
static void
init_syms(void)
{
if (real_access)
return;
VIR_MOCK_REAL_INIT(access);
VIR_MOCK_REAL_INIT(open);
# if WITH___OPEN_2
VIR_MOCK_REAL_INIT(__open_2);
# endif /* WITH___OPEN_2 */
VIR_MOCK_REAL_INIT(close);
# if defined(__APPLE__) && defined(__x86_64__)
VIR_MOCK_REAL_INIT_ALIASED(opendir, "opendir$INODE64");
# else
VIR_MOCK_REAL_INIT(opendir);
# endif
VIR_MOCK_REAL_INIT(virFileCanonicalizePath);
}
static void
init_env(void)
{
g_autofree char *tmp = NULL;
const char fullVPDExampleData[] = {
PCI_VPD_LARGE_RESOURCE_FLAG | PCI_VPD_STRING_RESOURCE_FLAG, 0x08, 0x00,
't', 'e', 's', 't', 'n', 'a', 'm', 'e',
PCI_VPD_LARGE_RESOURCE_FLAG | PCI_VPD_READ_ONLY_LARGE_RESOURCE_FLAG, 0x16, 0x00,
'P', 'N', 0x02, '4', '2',
'E', 'C', 0x04, '4', '<', '>', '2',
'V', 'A', 0x02, 'E', 'X',
'R', 'V', 0x02, 0x1D, 0x00,
PCI_VPD_RESOURCE_END_VAL
};
struct pciVPD exampleVPD = {
.data = fullVPDExampleData,
.vpd_len = G_N_ELEMENTS(fullVPDExampleData),
};
if (!(fakerootdir = getenv("LIBVIRT_FAKE_ROOT_DIR")))
ABORT("Missing LIBVIRT_FAKE_ROOT_DIR env variable\n");
tmp = g_strdup_printf("%s%s", fakerootdir, SYSFS_PCI_PREFIX);
if (g_mkdir_with_parents(tmp, 0777) < 0)
ABORT("Unable to create: %s", tmp);
make_dir(tmp, "devices");
make_dir(tmp, "drivers");
make_file(tmp, "drivers_probe", NULL, -1);
/* Create /dev/vfio/ dir and /dev/vfio/vfio file */
VIR_FREE(tmp);
tmp = g_strdup_printf("%s/dev/vfio", fakerootdir);
if (g_mkdir_with_parents(tmp, 0777) < 0)
ABORT("Unable to create: %s", tmp);
make_file(tmp, "vfio", NULL, -1);
# define MAKE_PCI_DRIVER(name, ...) \
pci_driver_new(name, __VA_ARGS__, -1, -1)
MAKE_PCI_DRIVER("iwlwifi", 0x8086, 0x0044);
MAKE_PCI_DRIVER("i915", 0x8086, 0x0046, 0x8086, 0x0047);
MAKE_PCI_DRIVER("vfio-pci", -1, -1);
MAKE_PCI_DRIVER("nvme", 0x1cc1, 0x8201);
# define MAKE_PCI_DEVICE(Id, Vendor, Device, IommuGroup, ...) \
do { \
struct pciDevice dev = {.vendor = Vendor, \
.device = Device, \
.iommuGroup = IommuGroup, __VA_ARGS__}; \
if (pci_address_parse(&dev.addr, Id) < 0) \
ABORT("Unable to parse PCI address " Id); \
pci_device_new_from_stub(&dev); \
} while (0)
MAKE_PCI_DEVICE("0000:00:00.0", 0x8086, 0x0044, 0);
MAKE_PCI_DEVICE("0000:00:01.0", 0x8086, 0x0044, 1);
MAKE_PCI_DEVICE("0000:00:02.0", 0x8086, 0x0046, 2);
MAKE_PCI_DEVICE("0000:00:03.0", 0x8086, 0x0048, 3);
MAKE_PCI_DEVICE("0001:00:00.0", 0x1014, 0x03b9, 4, .klass = 0x060400);
MAKE_PCI_DEVICE("0001:01:00.0", 0x8086, 0x105e, 5);
MAKE_PCI_DEVICE("0001:01:00.1", 0x8086, 0x105e, 5);
MAKE_PCI_DEVICE("0005:80:00.0", 0x10b5, 0x8112, 6, .klass = 0x060400);
MAKE_PCI_DEVICE("0005:90:01.0", 0x1033, 0x0035, 7);
MAKE_PCI_DEVICE("0005:90:01.1", 0x1033, 0x0035, 7);
MAKE_PCI_DEVICE("0005:90:01.2", 0x1033, 0x00e0, 7);
MAKE_PCI_DEVICE("0005:90:01.3", 0x1033, 0x00e0, 7);
MAKE_PCI_DEVICE("0000:0a:01.0", 0x8086, 0x0047, 8);
MAKE_PCI_DEVICE("0000:0a:02.0", 0x8286, 0x0048, 8);
MAKE_PCI_DEVICE("0000:0a:03.0", 0x8386, 0x0048, 8);
MAKE_PCI_DEVICE("0000:06:12.0", 0x8086, 0x0047, 9);
MAKE_PCI_DEVICE("0000:06:12.1", 0x8086, 0x0047, 10,
.physfn = "0000:06:12.0"); /* Virtual Function */
MAKE_PCI_DEVICE("0000:06:12.2", 0x8086, 0x0047, 11,
.physfn = "0000:06:12.0"); /* Virtual Function */
MAKE_PCI_DEVICE("0021:de:1f.0", 0x8086, 0x0047, 12);
MAKE_PCI_DEVICE("0021:de:1f.1", 0x8086, 0x0047, 13,
.physfn = "0021:de:1f.0"); /* Virtual Function */
MAKE_PCI_DEVICE("0000:01:00.0", 0x1cc1, 0x8201, 14, .klass = 0x010802);
MAKE_PCI_DEVICE("0000:02:00.0", 0x1cc1, 0x8201, 15, .klass = 0x010802);
MAKE_PCI_DEVICE("0000:03:00.0", 0x15b3, 0xa2d6, 16, .vpd = exampleVPD);
}
/*
*
* Mocked functions
*
*/
int
access(const char *path, int mode)
{
g_autofree char *newpath = NULL;
init_syms();
if (getrealpath(&newpath, path) < 0)
return -1;
return real_access(newpath, mode);
}
static int
virMockStatRedirect(const char *path, char **newpath)
{
if (getrealpath(newpath, path) < 0)
return -1;
return 0;
}
int
open(const char *path, int flags, ...)
{
int ret;
g_autofree char *newpath = NULL;
init_syms();
if (getrealpath(&newpath, path) < 0)
return -1;
if (flags & O_CREAT) {
va_list ap;
mode_t mode;
va_start(ap, flags);
mode = (mode_t) va_arg(ap, int);
va_end(ap);
ret = real_open(newpath, flags, mode);
} else {
ret = real_open(newpath, flags);
}
/* Catch both: /sys/bus/pci/drivers/... and
* /sys/bus/pci/device/.../driver/... */
if (ret >= 0 && STRPREFIX(path, SYSFS_PCI_PREFIX) &&
strstr(path, "driver") && add_fd(ret, path) < 0) {
real_close(ret);
ret = -1;
}
return ret;
}
# if WITH___OPEN_2
int
__open_2(const char *path, int flags)
{
g_autofree char *newpath = NULL;
int ret;
init_syms();
if (getrealpath(&newpath, path) < 0)
return -1;
ret = real___open_2(newpath, flags);
/* Catch both: /sys/bus/pci/drivers/... and
* /sys/bus/pci/device/.../driver/... */
if (ret >= 0 && STRPREFIX(path, SYSFS_PCI_PREFIX) &&
strstr(path, "driver") && add_fd(ret, path) < 0) {
real_close(ret);
ret = -1;
}
return ret;
}
# endif /* WITH___OPEN_2 */
DIR *
opendir(const char *path)
{
g_autofree char *newpath = NULL;
init_syms();
if (getrealpath(&newpath, path) < 0)
return NULL;
return real_opendir(newpath);
}
int
close(int fd)
{
init_syms();
if (remove_fd(fd) < 0)
return -1;
return real_close(fd);
}
char *
virFileCanonicalizePath(const char *path)
{
g_autofree char *newpath = NULL;
init_syms();
if (getrealpath(&newpath, path) < 0)
return NULL;
return real_virFileCanonicalizePath(newpath);
}
# include "virmockstathelpers.c"
#else
/* Nothing to override on this platform */
#endif
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