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libvirt/tests/virpcimock.c
Daniel P. Berrangé 12d17dcc26 src: replace last_component() with g_path_get_basename() 
The last_component() method is a GNULIB custom function
that returns a pointer to the base name in the path.
This is similar to g_path_get_basename() but without the
malloc. The extra malloc is no trouble for libvirt's
needs so we can use g_path_get_basename().

Reviewed-by: Fabiano Fidêncio <fidencio@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
2020-01-03 15:42:13 +00:00

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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>
#if defined(__linux__) || defined(__FreeBSD__)
# include "virmock.h"
# include <unistd.h>
# include <fcntl.h>
# include <sys/stat.h>
# include <stdarg.h>
# include <dirent.h>
# include "viralloc.h"
# include "virstring.h"
# include "virfile.h"
static int (*real_access)(const char *path, int mode);
static int (*real_open)(const char *path, int flags, ...);
# ifdef __GLIBC__
static int (*real___open_2)(const char *path, int flags);
# endif /* ! __GLIBC__ */
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.%d"
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 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)
{
int 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);
VIR_FORCE_CLOSE(fd);
}
static void
make_dir(const char *path,
const char *name)
{
g_autofree char *dirpath = NULL;
dirpath = g_strdup_printf("%s/%s", path, name);
if (virFileMakePath(dirpath) < 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;
bzero(buf, 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);
}
if (VIR_REALLOC_N_QUIET(callbacks, nCallbacks + 1) < 0) {
errno = ENOMEM;
return -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)
{
char *ret;
ret = g_strdup_printf(ADDR_STR_FMT,
addr->domain, addr->bus,
addr->device, addr->function);
return ret;
}
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 (virFileMakePath(iommuPath) < 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;
}
if (VIR_ALLOC_QUIET(iommuGroup) < 0)
ABORT_OOM();
iommuGroup->iommu = dev->iommuGroup;
iommuGroup->nDevicesBoundToVFIO = 0; /* No device bound to VFIO by default */
if (VIR_APPEND_ELEMENT_QUIET(pciIommuGroups, npciIommuGroups,
iommuGroup) < 0)
ABORT_OOM();
}
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, ':');
}
if (VIR_ALLOC_QUIET(dev) < 0)
ABORT_OOM();
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 (virFileMakePath(devpath) < 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 (pci_device_autobind(dev) < 0)
ABORT("Unable to bind: %s", devid);
if (VIR_APPEND_ELEMENT_QUIET(pciDevices, nPCIDevices, dev) < 0)
ABORT_OOM();
}
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;
if (VIR_ALLOC_QUIET(driver) < 0)
ABORT_OOM();
driver->name = g_strdup(name);
if (!(driverpath = pci_driver_get_path(driver, NULL, true)))
ABORT_OOM();
if (virFileMakePath(driverpath) < 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);
if (VIR_REALLOC_N_QUIET(driver->vendor, driver->len + 1) < 0 ||
VIR_REALLOC_N_QUIET(driver->device, driver->len + 1) < 0)
ABORT_OOM();
driver->vendor[driver->len] = vendor;
driver->device[driver->len] = device;
driver->len++;
}
va_end(args);
make_file(driverpath, "bind", NULL, -1);
make_file(driverpath, "unbind", NULL, -1);
if (VIR_APPEND_ELEMENT_QUIET(pciDrivers, nPCIDrivers, driver) < 0)
ABORT_OOM();
}
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);
}
/*
* 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);
# ifdef __GLIBC__
VIR_MOCK_REAL_INIT(__open_2);
# endif /* ! __GLIBC__ */
VIR_MOCK_REAL_INIT(close);
VIR_MOCK_REAL_INIT(opendir);
VIR_MOCK_REAL_INIT(virFileCanonicalizePath);
}
static void
init_env(void)
{
g_autofree char *tmp = NULL;
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 (virFileMakePath(tmp) < 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 (virFileMakePath(tmp) < 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);
}
/*
*
* 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;
}
# ifdef __GLIBC__
/* in some cases this function may not be present in headers, so we need
* a declaration to silence the complier */
int
__open_2(const char *path, int flags);
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 /* ! __GLIBC__ */
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)
{
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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