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libvirt/src/util/virpci.c
Laine Stump c00b6b1ae3 util: make virPCIDeviceIsPCIExpress() more intelligent 
Until now there has been an extra bit of code in
qemuDomainDeviceCalculatePCIConnectFlag() (one of the two callers of
virPCIDeviceIsPCIExpress()) that tries to determine if a device is
PCIe by looking at the *length* of its sysfs config file; it only does
this when libvirt is running as a non-root process.

This patch takes advantage of our newfound ability to tell the
difference between "I read a 0 from the device PCI config file" and "I
couldn't read the PCI Express Capabilities because I don't have
sufficient permission" to put the file length check down in
virPCIDeviceIsPCIExpress(), and do that check any time we fail while
reading the config file (not only when the process is non-root).

Fixes: https://bugzilla.redhat.com/1901685
Signed-off-by: Laine Stump <laine@redhat.com>
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>
2020-12-12 18:36:48 -05:00

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/*
* virpci.c: helper APIs for managing host PCI devices
*
* Copyright (C) 2009-2015 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>
#include "virpci.h"
#include "virnetdev.h"
#include <dirent.h>
#include <fcntl.h>
#include <inttypes.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include "virlog.h"
#include "vircommand.h"
#include "virerror.h"
#include "virfile.h"
#include "virkmod.h"
#include "virstring.h"
#include "viralloc.h"
VIR_LOG_INIT("util.pci");
#define PCI_SYSFS "/sys/bus/pci/"
#define PCI_ID_LEN 10 /* "XXXX XXXX" */
VIR_ENUM_IMPL(virPCIELinkSpeed,
VIR_PCIE_LINK_SPEED_LAST,
"", "2.5", "5", "8", "16",
);
VIR_ENUM_IMPL(virPCIStubDriver,
VIR_PCI_STUB_DRIVER_LAST,
"none",
"pciback", /* XEN */
"vfio-pci", /* VFIO */
);
VIR_ENUM_IMPL(virPCIHeader,
VIR_PCI_HEADER_LAST,
"endpoint",
"pci-bridge",
"cardbus-bridge",
);
struct _virPCIDevice {
virPCIDeviceAddress address;
char *name; /* domain:bus:slot.function */
char id[PCI_ID_LEN]; /* product vendor */
char *path;
/* The driver:domain which uses the device */
char *used_by_drvname;
char *used_by_domname;
/* The following 5 items are only valid after virPCIDeviceInit()
* has been called for the virPCIDevice object. This is *not* done
* in most cases (because it creates extra overhead, and parts of
* it can fail if libvirtd is running unprivileged)
*/
unsigned int pcie_cap_pos;
unsigned int pci_pm_cap_pos;
bool has_flr;
bool has_pm_reset;
bool is_pcie;
/**/
bool managed;
virPCIStubDriver stubDriver;
/* used by reattach function */
bool unbind_from_stub;
bool remove_slot;
bool reprobe;
};
struct _virPCIDeviceList {
virObjectLockable parent;
size_t count;
virPCIDevicePtr *devs;
};
/* For virReportOOMError() and virReportSystemError() */
#define VIR_FROM_THIS VIR_FROM_NONE
/* Specifications referenced in comments:
* PCI30 - PCI Local Bus Specification 3.0
* PCIe20 - PCI Express Base Specification 2.0
* BR12 - PCI-to-PCI Bridge Architecture Specification 1.2
* PM12 - PCI Bus Power Management Interface Specification 1.2
* ECN_AF - Advanced Capabilities for Conventional PCI ECN
*/
/* Type 0 config space header length; PCI30 Section 6.1 Configuration Space Organization */
#define PCI_CONF_LEN 0x100
#define PCI_CONF_HEADER_LEN 0x40
/* PCI30 6.2.1 */
#define PCI_HEADER_TYPE 0x0e /* Header type */
#define PCI_HEADER_TYPE_BRIDGE 0x1
#define PCI_HEADER_TYPE_MASK 0x7f
#define PCI_HEADER_TYPE_MULTI 0x80
/* PCI30 6.2.1 Device Identification */
#define PCI_CLASS_DEVICE 0x0a /* Device class */
/* Class Code for bridge; PCI30 D.7 Base Class 06h */
#define PCI_CLASS_BRIDGE_PCI 0x0604
/* PCI30 6.2.3 Device Status */
#define PCI_STATUS 0x06 /* 16 bits */
#define PCI_STATUS_CAP_LIST 0x10 /* Support Capability List */
/* PCI30 6.7 Capabilities List */
#define PCI_CAPABILITY_LIST 0x34 /* Offset of first capability list entry */
#define PCI_CAP_FLAGS 2 /* Capability defined flags (16 bits) */
/* PM12 3.2.1 Capability Identifier */
#define PCI_CAP_ID_PM 0x01 /* Power Management */
/* PCI30 H Capability IDs */
#define PCI_CAP_ID_EXP 0x10 /* PCI Express */
/* ECN_AF 6.x.1.1 Capability ID for AF */
#define PCI_CAP_ID_AF 0x13 /* Advanced Features */
/* PCIe20 7.8.3 Device Capabilities Register (Offset 04h) */
#define PCI_EXP_DEVCAP 0x4 /* Device capabilities */
#define PCI_EXP_DEVCAP_FLR (1<<28) /* Function Level Reset */
#define PCI_EXP_LNKCAP 0xc /* Link Capabilities */
#define PCI_EXP_LNKCAP_SPEED 0x0000f /* Maximum Link Speed */
#define PCI_EXP_LNKCAP_WIDTH 0x003f0 /* Maximum Link Width */
#define PCI_EXP_LNKSTA 0x12 /* Link Status */
#define PCI_EXP_LNKSTA_SPEED 0x000f /* Negotiated Link Speed */
#define PCI_EXP_LNKSTA_WIDTH 0x03f0 /* Negotiated Link Width */
/* Header type 1 BR12 3.2 PCI-to-PCI Bridge Configuration Space Header Format */
#define PCI_PRIMARY_BUS 0x18 /* BR12 3.2.5.2 Primary bus number */
#define PCI_SECONDARY_BUS 0x19 /* BR12 3.2.5.3 Secondary bus number */
#define PCI_SUBORDINATE_BUS 0x1a /* BR12 3.2.5.4 Highest bus number behind the bridge */
#define PCI_BRIDGE_CONTROL 0x3e
/* BR12 3.2.5.18 Bridge Control Register */
#define PCI_BRIDGE_CTL_RESET 0x40 /* Secondary bus reset */
/* PM12 3.2.4 Power Management Control/Status (Offset = 4) */
#define PCI_PM_CTRL 4 /* PM control and status register */
#define PCI_PM_CTRL_STATE_MASK 0x3 /* Current power state (D0 to D3) */
#define PCI_PM_CTRL_STATE_D0 0x0 /* D0 state */
#define PCI_PM_CTRL_STATE_D3hot 0x3 /* D3 state */
#define PCI_PM_CTRL_NO_SOFT_RESET 0x8 /* No reset for D3hot->D0 */
/* ECN_AF 6.x.1 Advanced Features Capability Structure */
#define PCI_AF_CAP 0x3 /* Advanced features capabilities */
#define PCI_AF_CAP_FLR 0x2 /* Function Level Reset */
#define PCI_EXP_FLAGS 0x2
#define PCI_EXP_FLAGS_TYPE 0x00f0
#define PCI_EXP_TYPE_DOWNSTREAM 0x6
#define PCI_EXT_CAP_BASE 0x100
#define PCI_EXT_CAP_LIMIT 0x1000
#define PCI_EXT_CAP_ID_MASK 0x0000ffff
#define PCI_EXT_CAP_OFFSET_SHIFT 20
#define PCI_EXT_CAP_OFFSET_MASK 0x00000ffc
#define PCI_EXT_CAP_ID_ACS 0x000d
#define PCI_EXT_ACS_CTRL 0x06
#define PCI_EXT_CAP_ACS_SV 0x01
#define PCI_EXT_CAP_ACS_RR 0x04
#define PCI_EXT_CAP_ACS_CR 0x08
#define PCI_EXT_CAP_ACS_UF 0x10
#define PCI_EXT_CAP_ACS_ENABLED (PCI_EXT_CAP_ACS_SV | \
PCI_EXT_CAP_ACS_RR | \
PCI_EXT_CAP_ACS_CR | \
PCI_EXT_CAP_ACS_UF)
#define PCI_EXP_TYPE_ROOT_INT_EP 0x9 /* Root Complex Integrated Endpoint */
#define PCI_EXP_TYPE_ROOT_EC 0xa /* Root Complex Event Collector */
static virClassPtr virPCIDeviceListClass;
static void virPCIDeviceListDispose(void *obj);
static int virPCIOnceInit(void)
{
if (!VIR_CLASS_NEW(virPCIDeviceList, virClassForObjectLockable()))
return -1;
return 0;
}
VIR_ONCE_GLOBAL_INIT(virPCI);
static char *
virPCIDriverDir(const char *driver)
{
return g_strdup_printf(PCI_SYSFS "drivers/%s", driver);
}
static char *
virPCIFile(const char *device, const char *file)
{
return g_strdup_printf(PCI_SYSFS "devices/%s/%s", device, file);
}
/* virPCIDeviceGetDriverPathAndName - put the path to the driver
* directory of the driver in use for this device in @path and the
* name of the driver in @name. Both could be NULL if it's not bound
* to any driver.
*
* Return 0 for success, -1 for error.
*/
int
virPCIDeviceGetDriverPathAndName(virPCIDevicePtr dev, char **path, char **name)
{
int ret = -1;
g_autofree char *drvlink = NULL;
*path = *name = NULL;
/* drvlink = "/sys/bus/pci/dddd:bb:ss.ff/driver" */
drvlink = virPCIFile(dev->name, "driver");
if (!virFileExists(drvlink)) {
ret = 0;
goto cleanup;
}
if (virFileIsLink(drvlink) != 1) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("Invalid device %s driver file %s is not a symlink"),
dev->name, drvlink);
goto cleanup;
}
if (virFileResolveLink(drvlink, path) < 0) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("Unable to resolve device %s driver symlink %s"),
dev->name, drvlink);
goto cleanup;
}
/* path = "/sys/bus/pci/drivers/${drivername}" */
*name = g_path_get_basename(*path);
/* name = "${drivername}" */
ret = 0;
cleanup:
if (ret < 0) {
VIR_FREE(*path);
VIR_FREE(*name);
}
return ret;
}
static int
virPCIDeviceConfigOpenInternal(virPCIDevicePtr dev, bool readonly, bool fatal)
{
int fd;
fd = open(dev->path, readonly ? O_RDONLY : O_RDWR);
if (fd < 0) {
if (fatal) {
virReportSystemError(errno,
_("Failed to open config space file '%s'"),
dev->path);
} else {
VIR_WARN("Failed to open config space file '%s': %s",
dev->path, g_strerror(errno));
}
return -1;
}
VIR_DEBUG("%s %s: opened %s", dev->id, dev->name, dev->path);
return fd;
}
static int
virPCIDeviceConfigOpen(virPCIDevicePtr dev)
{
return virPCIDeviceConfigOpenInternal(dev, true, true);
}
static int
virPCIDeviceConfigOpenTry(virPCIDevicePtr dev)
{
return virPCIDeviceConfigOpenInternal(dev, true, false);
}
static int
virPCIDeviceConfigOpenWrite(virPCIDevicePtr dev)
{
return virPCIDeviceConfigOpenInternal(dev, false, true);
}
static void
virPCIDeviceConfigClose(virPCIDevicePtr dev, int cfgfd)
{
if (VIR_CLOSE(cfgfd) < 0) {
VIR_WARN("Failed to close config space file '%s': %s",
dev->path, g_strerror(errno));
}
}
static int
virPCIDeviceRead(virPCIDevicePtr dev,
int cfgfd,
unsigned int pos,
uint8_t *buf,
unsigned int buflen)
{
memset(buf, 0, buflen);
errno = 0;
if (lseek(cfgfd, pos, SEEK_SET) != pos ||
saferead(cfgfd, buf, buflen) != buflen) {
VIR_DEBUG("Failed to read %u bytes at %u from '%s' : %s",
buflen, pos, dev->path, g_strerror(errno));
return -1;
}
return 0;
}
/**
* virPCIDeviceReadN:
* @dev: virPCIDevice object (used only to log name of config file)
* @cfgfd: open file descriptor for device config file in sysfs
* @pos: byte offset in the file to read from
*
* read "N" (where "N" is "8", "16", or "32", and appears at the end
* of the function name) bytes from a PCI device's already-opened
* sysfs config file and return them as the return value from the
* function.
*
* Returns the value at @pos in the file, or 0 if there was an
* error. NB: since 0 could be a valid value, occurence of an error
* must be determined by examining errno. errno is always reset to 0
* before the seek/read is attempted (see virPCIDeviceRead()), so if
* errno != 0 on return from one of these functions, then either the
* seek or the read operation failed for some reason. If errno == 0
* and the return value is 0, then the config file really does contain
* the value 0 at @pos.
*/
static uint8_t
virPCIDeviceRead8(virPCIDevicePtr dev, int cfgfd, unsigned int pos)
{
uint8_t buf;
virPCIDeviceRead(dev, cfgfd, pos, &buf, sizeof(buf));
return buf;
}
static uint16_t
virPCIDeviceRead16(virPCIDevicePtr dev, int cfgfd, unsigned int pos)
{
uint8_t buf[2];
virPCIDeviceRead(dev, cfgfd, pos, &buf[0], sizeof(buf));
return (buf[0] << 0) | (buf[1] << 8);
}
static uint32_t
virPCIDeviceRead32(virPCIDevicePtr dev, int cfgfd, unsigned int pos)
{
uint8_t buf[4];
virPCIDeviceRead(dev, cfgfd, pos, &buf[0], sizeof(buf));
return (buf[0] << 0) | (buf[1] << 8) | (buf[2] << 16) | (buf[3] << 24);
}
static int
virPCIDeviceReadClass(virPCIDevicePtr dev, uint16_t *device_class)
{
g_autofree char *path = NULL;
g_autofree char *id_str = NULL;
unsigned int value;
path = virPCIFile(dev->name, "class");
/* class string is '0xNNNNNN\n' ... i.e. 9 bytes */
if (virFileReadAll(path, 9, &id_str) < 0)
return -1;
id_str[8] = '\0';
if (virStrToLong_ui(id_str, NULL, 16, &value) < 0) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("Unusual value in %s/devices/%s/class: %s"),
PCI_SYSFS, dev->name, id_str);
return -1;
}
*device_class = (value >> 8) & 0xFFFF;
return 0;
}
static int
virPCIDeviceWrite(virPCIDevicePtr dev,
int cfgfd,
unsigned int pos,
uint8_t *buf,
unsigned int buflen)
{
if (lseek(cfgfd, pos, SEEK_SET) != pos ||
safewrite(cfgfd, buf, buflen) != buflen) {
VIR_WARN("Failed to write to '%s' : %s", dev->path,
g_strerror(errno));
return -1;
}
return 0;
}
static void
virPCIDeviceWrite16(virPCIDevicePtr dev, int cfgfd, unsigned int pos, uint16_t val)
{
uint8_t buf[2] = { (val >> 0), (val >> 8) };
virPCIDeviceWrite(dev, cfgfd, pos, &buf[0], sizeof(buf));
}
static void
virPCIDeviceWrite32(virPCIDevicePtr dev, int cfgfd, unsigned int pos, uint32_t val)
{
uint8_t buf[4] = { (val >> 0), (val >> 8), (val >> 16), (val >> 24) };
virPCIDeviceWrite(dev, cfgfd, pos, &buf[0], sizeof(buf));
}
typedef int (*virPCIDeviceIterPredicate)(virPCIDevicePtr, virPCIDevicePtr,
void *);
/* Iterate over available PCI devices calling @predicate
* to compare each one to @dev.
* Return -1 on error since we don't want to assume it is
* safe to reset if there is an error.
*/
static int
virPCIDeviceIterDevices(virPCIDeviceIterPredicate predicate,
virPCIDevicePtr dev,
virPCIDevicePtr *matched,
void *data)
{
g_autoptr(DIR) dir = NULL;
struct dirent *entry;
int ret = 0;
int rc;
*matched = NULL;
VIR_DEBUG("%s %s: iterating over " PCI_SYSFS "devices", dev->id, dev->name);
if (virDirOpen(&dir, PCI_SYSFS "devices") < 0)
return -1;
while ((ret = virDirRead(dir, &entry, PCI_SYSFS "devices")) > 0) {
unsigned int domain, bus, slot, function;
g_autoptr(virPCIDevice) check = NULL;
char *tmp;
/* expected format: <domain>:<bus>:<slot>.<function> */
if (/* domain */
virStrToLong_ui(entry->d_name, &tmp, 16, &domain) < 0 || *tmp != ':' ||
/* bus */
virStrToLong_ui(tmp + 1, &tmp, 16, &bus) < 0 || *tmp != ':' ||
/* slot */
virStrToLong_ui(tmp + 1, &tmp, 16, &slot) < 0 || *tmp != '.' ||
/* function */
virStrToLong_ui(tmp + 1, NULL, 16, &function) < 0) {
VIR_WARN("Unusual entry in " PCI_SYSFS "devices: %s", entry->d_name);
continue;
}
check = virPCIDeviceNew(domain, bus, slot, function);
if (!check) {
ret = -1;
break;
}
rc = predicate(dev, check, data);
if (rc < 0) {
/* the predicate returned an error, bail */
ret = -1;
break;
} else if (rc == 1) {
VIR_DEBUG("%s %s: iter matched on %s", dev->id, dev->name, check->name);
*matched = g_steal_pointer(&check);
ret = 1;
break;
}
}
return ret;
}
/**
* virPCIDeviceFindCapabilityOffset:
* @dev: virPCIDevice object (used only to log name of config file)
* @cfgfd: open file descriptor for device config file in sysfs
* @capability: PCI_CAP_ID_* being requested
* @offset: used to return the offset of @capability in the file
*
* Find the offset of @capability within the PCI config file @cfgfd of
* the device @dev. if found, the offset is returned in @offset,
* otherwise @offset is set to 0.
*
* Returns 0 on success, -1 on failure.
*/
static int
virPCIDeviceFindCapabilityOffset(virPCIDevicePtr dev,
int cfgfd,
unsigned int capability,
unsigned int *offset)
{
uint16_t status;
uint8_t pos;
*offset = 0; /* assume failure (*nothing* can be at offset 0) */
status = virPCIDeviceRead16(dev, cfgfd, PCI_STATUS);
if (errno != 0 || !(status & PCI_STATUS_CAP_LIST))
goto error;
pos = virPCIDeviceRead8(dev, cfgfd, PCI_CAPABILITY_LIST);
if (errno != 0)
goto error;
/* Zero indicates last capability, capabilities can't
* be in the config space header and 0xff is returned
* by the kernel if we don't have access to this region
*
* Note: we're not handling loops or extended
* capabilities here.
*/
while (pos >= PCI_CONF_HEADER_LEN && pos != 0xff) {
uint8_t capid = virPCIDeviceRead8(dev, cfgfd, pos);
if (errno != 0)
goto error;
if (capid == capability) {
VIR_DEBUG("%s %s: found cap 0x%.2x at 0x%.2x",
dev->id, dev->name, capability, pos);
*offset = pos;
return 0;
}
pos = virPCIDeviceRead8(dev, cfgfd, pos + 1);
if (errno != 0)
goto error;
}
error:
VIR_DEBUG("%s %s: failed to find cap 0x%.2x (%s)",
dev->id, dev->name, capability, g_strerror(errno));
/* reset errno in case the failure was due to insufficient
* privileges to read the entire PCI config file
*/
errno = 0;
return -1;
}
static unsigned int
virPCIDeviceFindExtendedCapabilityOffset(virPCIDevicePtr dev,
int cfgfd,
unsigned int capability)
{
int ttl;
unsigned int pos;
uint32_t header;
/* minimum 8 bytes per capability */
ttl = (PCI_EXT_CAP_LIMIT - PCI_EXT_CAP_BASE) / 8;
pos = PCI_EXT_CAP_BASE;
while (ttl > 0 && pos >= PCI_EXT_CAP_BASE) {
header = virPCIDeviceRead32(dev, cfgfd, pos);
if ((header & PCI_EXT_CAP_ID_MASK) == capability)
return pos;
pos = (header >> PCI_EXT_CAP_OFFSET_SHIFT) & PCI_EXT_CAP_OFFSET_MASK;
ttl--;
}
return 0;
}
/* detects whether this device has FLR. Returns 0 if the device does
* not have FLR, 1 if it does, and -1 on error
*/
static bool
virPCIDeviceDetectFunctionLevelReset(virPCIDevicePtr dev, int cfgfd)
{
uint32_t caps;
unsigned int pos;
g_autofree char *path = NULL;
int found;
/* The PCIe Function Level Reset capability allows
* individual device functions to be reset without
* affecting any other functions on the device or
* any other devices on the bus. This is only common
* on SR-IOV NICs at the moment.
*/
if (dev->pcie_cap_pos) {
caps = virPCIDeviceRead32(dev, cfgfd, dev->pcie_cap_pos + PCI_EXP_DEVCAP);
if (caps & PCI_EXP_DEVCAP_FLR) {
VIR_DEBUG("%s %s: detected PCIe FLR capability", dev->id, dev->name);
return true;
}
}
/* The PCI AF Function Level Reset capability is
* the same thing, except for conventional PCI
* devices. This is not common yet.
*/
if (virPCIDeviceFindCapabilityOffset(dev, cfgfd, PCI_CAP_ID_AF, &pos) < 0)
goto error;
if (pos) {
caps = virPCIDeviceRead16(dev, cfgfd, pos + PCI_AF_CAP);
if (caps & PCI_AF_CAP_FLR) {
VIR_DEBUG("%s %s: detected PCI FLR capability", dev->id, dev->name);
return true;
}
}
/* there are some buggy devices that do support FLR, but forget to
* advertise that fact in their capabilities. However, FLR is *required*
* to be present for virtual functions (VFs), so if we see that this
* device is a VF, we just assume FLR works
*/
path = g_strdup_printf(PCI_SYSFS "devices/%s/physfn", dev->name);
found = virFileExists(path);
if (found) {
VIR_DEBUG("%s %s: buggy device didn't advertise FLR, but is a VF; forcing flr on",
dev->id, dev->name);
return true;
}
error:
VIR_DEBUG("%s %s: no FLR capability found", dev->id, dev->name);
return false;
}
/* Require the device has the PCI Power Management capability
* and that a D3hot->D0 transition will results in a full
* internal reset, not just a soft reset.
*/
static bool
virPCIDeviceDetectPowerManagementReset(virPCIDevicePtr dev, int cfgfd)
{
if (dev->pci_pm_cap_pos) {
uint32_t ctl;
/* require the NO_SOFT_RESET bit is clear */
ctl = virPCIDeviceRead32(dev, cfgfd, dev->pci_pm_cap_pos + PCI_PM_CTRL);
if (!(ctl & PCI_PM_CTRL_NO_SOFT_RESET)) {
VIR_DEBUG("%s %s: detected PM reset capability", dev->id, dev->name);
return true;
}
}
VIR_DEBUG("%s %s: no PM reset capability found", dev->id, dev->name);
return false;
}
/* Any active devices on the same domain/bus ? */
static int
virPCIDeviceSharesBusWithActive(virPCIDevicePtr dev, virPCIDevicePtr check, void *data)
{
virPCIDeviceList *inactiveDevs = data;
/* Different domain, different bus, or simply identical device */
if (dev->address.domain != check->address.domain ||
dev->address.bus != check->address.bus ||
(dev->address.slot == check->address.slot &&
dev->address.function == check->address.function))
return 0;
/* same bus, but inactive, i.e. about to be assigned to guest */
if (inactiveDevs && virPCIDeviceListFind(inactiveDevs, check))
return 0;
return 1;
}
static virPCIDevicePtr
virPCIDeviceBusContainsActiveDevices(virPCIDevicePtr dev,
virPCIDeviceList *inactiveDevs)
{
virPCIDevicePtr active = NULL;
if (virPCIDeviceIterDevices(virPCIDeviceSharesBusWithActive,
dev, &active, inactiveDevs) < 0)
return NULL;
return active;
}
/* Is @check the parent of @dev ? */
static int
virPCIDeviceIsParent(virPCIDevicePtr dev, virPCIDevicePtr check, void *data)
{
uint16_t device_class;
uint8_t header_type, secondary, subordinate;
virPCIDevicePtr *best = data;
int ret = 0;
int fd;
if (dev->address.domain != check->address.domain)
return 0;
if ((fd = virPCIDeviceConfigOpenTry(check)) < 0)
return 0;
/* Is it a bridge? */
ret = virPCIDeviceReadClass(check, &device_class);
if (ret < 0 || device_class != PCI_CLASS_BRIDGE_PCI)
goto cleanup;
/* Is it a plane? */
header_type = virPCIDeviceRead8(check, fd, PCI_HEADER_TYPE);
if ((header_type & PCI_HEADER_TYPE_MASK) != PCI_HEADER_TYPE_BRIDGE)
goto cleanup;
secondary = virPCIDeviceRead8(check, fd, PCI_SECONDARY_BUS);
subordinate = virPCIDeviceRead8(check, fd, PCI_SUBORDINATE_BUS);
VIR_DEBUG("%s %s: found parent device %s", dev->id, dev->name, check->name);
/* if the secondary bus exactly equals the device's bus, then we found
* the direct parent. No further work is necessary
*/
if (dev->address.bus == secondary) {
ret = 1;
goto cleanup;
}
/* otherwise, SRIOV allows VFs to be on different buses than their PFs.
* In this case, what we need to do is look for the "best" match; i.e.
* the most restrictive match that still satisfies all of the conditions.
*/
if (dev->address.bus > secondary && dev->address.bus <= subordinate) {
if (*best == NULL) {
*best = virPCIDeviceNew(check->address.domain,
check->address.bus,
check->address.slot,
check->address.function);
if (*best == NULL) {
ret = -1;
goto cleanup;
}
} else {
/* OK, we had already recorded a previous "best" match for the
* parent. See if the current device is more restrictive than the
* best, and if so, make it the new best
*/
int bestfd;
uint8_t best_secondary;
if ((bestfd = virPCIDeviceConfigOpenTry(*best)) < 0)
goto cleanup;
best_secondary = virPCIDeviceRead8(*best, bestfd, PCI_SECONDARY_BUS);
virPCIDeviceConfigClose(*best, bestfd);
if (secondary > best_secondary) {
virPCIDeviceFree(*best);
*best = virPCIDeviceNew(check->address.domain,
check->address.bus,
check->address.slot,
check->address.function);
if (*best == NULL) {
ret = -1;
goto cleanup;
}
}
}
}
cleanup:
virPCIDeviceConfigClose(check, fd);
return ret;
}
static int
virPCIDeviceGetParent(virPCIDevicePtr dev, virPCIDevicePtr *parent)
{
virPCIDevicePtr best = NULL;
int ret;
*parent = NULL;
ret = virPCIDeviceIterDevices(virPCIDeviceIsParent, dev, parent, &best);
if (ret == 1)
virPCIDeviceFree(best);
else if (ret == 0)
*parent = best;
return ret;
}
/* Secondary Bus Reset is our sledgehammer - it resets all
* devices behind a bus.
*/
static int
virPCIDeviceTrySecondaryBusReset(virPCIDevicePtr dev,
int cfgfd,
virPCIDeviceList *inactiveDevs)
{
g_autoptr(virPCIDevice) parent = NULL;
g_autoptr(virPCIDevice) conflict = NULL;
uint8_t config_space[PCI_CONF_LEN];
uint16_t ctl;
int ret = -1;
int parentfd;
/* Refuse to do a secondary bus reset if there are other
* devices/functions behind the bus are used by the host
* or other guests.
*/
if ((conflict = virPCIDeviceBusContainsActiveDevices(dev, inactiveDevs))) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("Active %s devices on bus with %s, not doing bus reset"),
conflict->name, dev->name);
return -1;
}
/* Find the parent bus */
if (virPCIDeviceGetParent(dev, &parent) < 0)
return -1;
if (!parent) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("Failed to find parent device for %s"),
dev->name);
return -1;
}
if ((parentfd = virPCIDeviceConfigOpenWrite(parent)) < 0)
goto out;
VIR_DEBUG("%s %s: doing a secondary bus reset", dev->id, dev->name);
/* Save and restore the device's config space; we only do this
* for the supplied device since we refuse to do a reset if there
* are multiple devices/functions
*/
if (virPCIDeviceRead(dev, cfgfd, 0, config_space, PCI_CONF_LEN) < 0) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("Failed to read PCI config space for %s"),
dev->name);
goto out;
}
/* Read the control register, set the reset flag, wait 200ms,
* unset the reset flag and wait 200ms.
*/
ctl = virPCIDeviceRead16(dev, parentfd, PCI_BRIDGE_CONTROL);
virPCIDeviceWrite16(parent, parentfd, PCI_BRIDGE_CONTROL,
ctl | PCI_BRIDGE_CTL_RESET);
g_usleep(200 * 1000); /* sleep 200ms */
virPCIDeviceWrite16(parent, parentfd, PCI_BRIDGE_CONTROL, ctl);
g_usleep(200 * 1000); /* sleep 200ms */
if (virPCIDeviceWrite(dev, cfgfd, 0, config_space, PCI_CONF_LEN) < 0) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("Failed to restore PCI config space for %s"),
dev->name);
goto out;
}
ret = 0;
out:
virPCIDeviceConfigClose(parent, parentfd);
return ret;
}
/* Power management reset attempts to reset a device using a
* D-state transition from D3hot to D0. Note, in detect_pm_reset()
* above we require the device supports a full internal reset.
*/
static int
virPCIDeviceTryPowerManagementReset(virPCIDevicePtr dev, int cfgfd)
{
uint8_t config_space[PCI_CONF_LEN];
uint32_t ctl;
if (!dev->pci_pm_cap_pos)
return -1;
/* Save and restore the device's config space. */
if (virPCIDeviceRead(dev, cfgfd, 0, &config_space[0], PCI_CONF_LEN) < 0) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("Failed to read PCI config space for %s"),
dev->name);
return -1;
}
VIR_DEBUG("%s %s: doing a power management reset", dev->id, dev->name);
ctl = virPCIDeviceRead32(dev, cfgfd, dev->pci_pm_cap_pos + PCI_PM_CTRL);
ctl &= ~PCI_PM_CTRL_STATE_MASK;
virPCIDeviceWrite32(dev, cfgfd, dev->pci_pm_cap_pos + PCI_PM_CTRL,
ctl | PCI_PM_CTRL_STATE_D3hot);
g_usleep(10 * 1000); /* sleep 10ms */
virPCIDeviceWrite32(dev, cfgfd, dev->pci_pm_cap_pos + PCI_PM_CTRL,
ctl | PCI_PM_CTRL_STATE_D0);
g_usleep(10 * 1000); /* sleep 10ms */
if (virPCIDeviceWrite(dev, cfgfd, 0, &config_space[0], PCI_CONF_LEN) < 0) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("Failed to restore PCI config space for %s"),
dev->name);
return -1;
}
return 0;
}
/**
* virPCIDeviceInit:
* @dev: virPCIDevice object needing its PCI capabilities info initialized
* @cfgfd: open file descriptor for device config file in sysfs
*
* Initialize the PCI capabilities attributes of a virPCIDevice object
* (i.e. pcie_cap_pos, pci_pm_cap_pos, has_flr, has_pm_reset, and
* is_pcie). This is done by walking the info in the (already-opened)
* device PCI config file in sysfs. This function can be called
* regardless of whether a process has sufficient privilege to read
* the entire file (unprivileged processes can only read the 1st 64
* bytes, while the Express Capabilities are all located beyond that
* boundary).
*
* In the case that we are unable to read a capability
* directly, we will attempt to infer its value by other means. In
* particular, we can determine that a device is (almost surely) PCIe
* by checking that the length of the config file is != 256 (since all
* conventional PCI config files are 256 bytes), and we know that any
* device that is an SR-IOV VF will have FLR available (since that is
* required by the SR-IOV spec.)
*
* Always returns success (0) (for now)
*/
static int
virPCIDeviceInit(virPCIDevicePtr dev, int cfgfd)
{
dev->is_pcie = false;
if (virPCIDeviceFindCapabilityOffset(dev, cfgfd, PCI_CAP_ID_EXP, &dev->pcie_cap_pos) < 0) {
/* an unprivileged process is unable to read *all* of a
* device's PCI config (it can only read the first 64
* bytes, which isn't enough for see the Express
* Capabilities data). If virPCIDeviceFindCapabilityOffset
* returns failure (and not just a pcie_cap_pos == 0,
* which is *success* at determining the device is *not*
* PCIe) we make an educated guess based on the length of
* the device's config file - if it is 256 bytes, then it
* is definitely a legacy PCI device. If it's larger than
* that, then it is *probably PCIe (although it could be
* PCI-x, but those are extremely rare). If the config
* file can't be found (in which case the "length" will be
* -1), then we blindly assume the most likely outcome -
* PCIe.
*/
off_t configLen = virFileLength(virPCIDeviceGetConfigPath(dev), -1);
if (configLen != 256)
dev->is_pcie = true;
} else {
dev->is_pcie = (dev->pcie_cap_pos != 0);
}
virPCIDeviceFindCapabilityOffset(dev, cfgfd, PCI_CAP_ID_PM, &dev->pci_pm_cap_pos);
dev->has_flr = virPCIDeviceDetectFunctionLevelReset(dev, cfgfd);
dev->has_pm_reset = virPCIDeviceDetectPowerManagementReset(dev, cfgfd);
return 0;
}
int
virPCIDeviceReset(virPCIDevicePtr dev,
virPCIDeviceList *activeDevs,
virPCIDeviceList *inactiveDevs)
{
g_autofree char *drvPath = NULL;
g_autofree char *drvName = NULL;
int ret = -1;
int fd = -1;
int hdrType = -1;
if (virPCIGetHeaderType(dev, &hdrType) < 0)
return -1;
if (hdrType != VIR_PCI_HEADER_ENDPOINT) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("Invalid attempt to reset PCI device %s. "
"Only PCI endpoint devices can be reset"),
dev->name);
return -1;
}
if (activeDevs && virPCIDeviceListFind(activeDevs, dev)) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("Not resetting active device %s"), dev->name);
return -1;
}
/* If the device is currently bound to vfio-pci, ignore all
* requests to reset it, since the vfio-pci driver will always
* reset it whenever appropriate, so doing it ourselves would just
* be redundant.
*/
if (virPCIDeviceGetDriverPathAndName(dev, &drvPath, &drvName) < 0)
goto cleanup;
if (virPCIStubDriverTypeFromString(drvName) == VIR_PCI_STUB_DRIVER_VFIO) {
VIR_DEBUG("Device %s is bound to vfio-pci - skip reset",
dev->name);
ret = 0;
goto cleanup;
}
VIR_DEBUG("Resetting device %s", dev->name);
if ((fd = virPCIDeviceConfigOpenWrite(dev)) < 0)
goto cleanup;
if (virPCIDeviceInit(dev, fd) < 0)
goto cleanup;
/* KVM will perform FLR when starting and stopping
* a guest, so there is no need for us to do it here.
*/
if (dev->has_flr) {
ret = 0;
goto cleanup;
}
/* If the device supports PCI power management reset,
* that's the next best thing because it only resets
* the function, not the whole device.
*/
if (dev->has_pm_reset)
ret = virPCIDeviceTryPowerManagementReset(dev, fd);
/* Bus reset is not an option with the root bus */
if (ret < 0 && dev->address.bus != 0)
ret = virPCIDeviceTrySecondaryBusReset(dev, fd, inactiveDevs);
if (ret < 0) {
virErrorPtr err = virGetLastError();
virReportError(VIR_ERR_INTERNAL_ERROR,
_("Unable to reset PCI device %s: %s"),
dev->name,
err ? err->message :
_("no FLR, PM reset or bus reset available"));
}
cleanup:
virPCIDeviceConfigClose(dev, fd);
return ret;
}
static int
virPCIProbeStubDriver(virPCIStubDriver driver)
{
const char *drvname = NULL;
g_autofree char *drvpath = NULL;
g_autofree char *errbuf = NULL;
if (driver == VIR_PCI_STUB_DRIVER_NONE ||
!(drvname = virPCIStubDriverTypeToString(driver))) {
virReportError(VIR_ERR_INTERNAL_ERROR,
"%s",
_("Attempting to use unknown stub driver"));
return -1;
}
drvpath = virPCIDriverDir(drvname);
/* driver previously loaded, return */
if (virFileExists(drvpath))
return 0;
if ((errbuf = virKModLoad(drvname))) {
VIR_WARN("failed to load driver %s: %s", drvname, errbuf);
goto cleanup;
}
/* driver loaded after probing */
if (virFileExists(drvpath))
return 0;
cleanup:
/* If we know failure was because of admin config, let's report that;
* otherwise, report a more generic failure message
*/
if (virKModIsProhibited(drvname)) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("Failed to load PCI stub module %s: "
"administratively prohibited"),
drvname);
} else {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("Failed to load PCI stub module %s"),
drvname);
}
return -1;
}
int
virPCIDeviceUnbind(virPCIDevicePtr dev)
{
g_autofree char *path = NULL;
g_autofree char *drvpath = NULL;
g_autofree char *driver = NULL;
if (virPCIDeviceGetDriverPathAndName(dev, &drvpath, &driver) < 0)
return -1;
if (!driver)
/* The device is not bound to any driver */
return 0;
path = virPCIFile(dev->name, "driver/unbind");
if (virFileExists(path)) {
if (virFileWriteStr(path, dev->name, 0) < 0) {
virReportSystemError(errno,
_("Failed to unbind PCI device '%s' from %s"),
dev->name, driver);
return -1;
}
}
return 0;
}
/**
* virPCIDeviceRebind:
* @dev: virPCIDevice object describing the device to rebind
*
* unbind a device from its driver, then immediately rebind it.
*
* Returns 0 on success, -1 on failure
*/
int virPCIDeviceRebind(virPCIDevicePtr dev)
{
if (virPCIDeviceUnbind(dev) < 0)
return -1;
if (virFileWriteStr(PCI_SYSFS "drivers_probe", dev->name, 0) < 0) {
virReportSystemError(errno,
_("Failed to trigger a probe for PCI device '%s'"),
dev->name);
return -1;
}
return 0;
}
/*
* Bind a PCI device to a driver using driver_override sysfs interface.
* E.g.
*
* echo driver-name > /sys/bus/pci/devices/0000:03:00.0/driver_override
* echo 0000:03:00.0 > /sys/bus/pci/devices/0000:03:00.0/driver/unbind
* echo 0000:03:00.0 > /sys/bus/pci/drivers_probe
*
* An empty driverName will cause the device to be bound to its
* preferred driver.
*/
static int
virPCIDeviceBindWithDriverOverride(virPCIDevicePtr dev,
const char *driverName)
{
g_autofree char *path = NULL;
path = virPCIFile(dev->name, "driver_override");
if (virFileWriteStr(path, driverName, 0) < 0) {
virReportSystemError(errno,
_("Failed to add driver '%s' to driver_override "
" interface of PCI device '%s'"),
driverName, dev->name);
return -1;
}
if (virPCIDeviceRebind(dev) < 0)
return -1;
return 0;
}
static int
virPCIDeviceUnbindFromStub(virPCIDevicePtr dev)
{
if (!dev->unbind_from_stub) {
VIR_DEBUG("Unbind from stub skipped for PCI device %s", dev->name);
return 0;
}
return virPCIDeviceBindWithDriverOverride(dev, "\n");
}
static int
virPCIDeviceBindToStub(virPCIDevicePtr dev)
{
const char *stubDriverName;
g_autofree char *stubDriverPath = NULL;
g_autofree char *driverLink = NULL;
/* Check the device is configured to use one of the known stub drivers */
if (dev->stubDriver == VIR_PCI_STUB_DRIVER_NONE) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("No stub driver configured for PCI device %s"),
dev->name);
return -1;
} else if (!(stubDriverName = virPCIStubDriverTypeToString(dev->stubDriver))) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("Unknown stub driver configured for PCI device %s"),
dev->name);
return -1;
}
stubDriverPath = virPCIDriverDir(stubDriverName);
driverLink = virPCIFile(dev->name, "driver");
if (virFileExists(driverLink)) {
if (virFileLinkPointsTo(driverLink, stubDriverPath)) {
/* The device is already bound to the correct driver */
VIR_DEBUG("Device %s is already bound to %s",
dev->name, stubDriverName);
return 0;
}
}
if (virPCIDeviceBindWithDriverOverride(dev, stubDriverName) < 0)
return -1;
dev->unbind_from_stub = true;
return 0;
}
/* virPCIDeviceDetach:
*
* Detach this device from the host driver, attach it to the stub
* driver (previously set with virPCIDeviceSetStubDriver(), and add *a
* copy* of the object to the inactiveDevs list (if provided). This
* function will *never* consume dev, so the caller should free it.
*
* Returns 0 on success, -1 on failure (will fail if the device is
* already in the activeDevs list, but will be a NOP if the device is
* already bound to the stub).
*
* GENERAL NOTE: activeDevs should be a list of all PCI devices
* currently in use by a domain. inactiveDevs is a list of all PCI
* devices that libvirt has detached from the host driver + attached
* to the stub driver, but hasn't yet assigned to a domain. Any device
* that is still attached to its host driver should not be on either
* list.
*/
int
virPCIDeviceDetach(virPCIDevicePtr dev,
virPCIDeviceList *activeDevs,
virPCIDeviceList *inactiveDevs)
{
if (virPCIProbeStubDriver(dev->stubDriver) < 0)
return -1;
if (activeDevs && virPCIDeviceListFind(activeDevs, dev)) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("Not detaching active device %s"), dev->name);
return -1;
}
if (virPCIDeviceBindToStub(dev) < 0)
return -1;
/* Add *a copy of* the dev into list inactiveDevs, if
* it's not already there.
*/
if (inactiveDevs && !virPCIDeviceListFind(inactiveDevs, dev)) {
VIR_DEBUG("Adding PCI device %s to inactive list", dev->name);
if (virPCIDeviceListAddCopy(inactiveDevs, dev) < 0)
return -1;
}
return 0;
}
/*
* Pre-condition: inactivePCIHostdevs & activePCIHostdevs
* are locked
*/
int
virPCIDeviceReattach(virPCIDevicePtr dev,
virPCIDeviceListPtr activeDevs,
virPCIDeviceListPtr inactiveDevs)
{
if (activeDevs && virPCIDeviceListFind(activeDevs, dev)) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("Not reattaching active device %s"), dev->name);
return -1;
}
if (virPCIDeviceUnbindFromStub(dev) < 0)
return -1;
/* Steal the dev from list inactiveDevs */
if (inactiveDevs) {
VIR_DEBUG("Removing PCI device %s from inactive list", dev->name);
virPCIDeviceListDel(inactiveDevs, dev);
}
return 0;
}
static char *
virPCIDeviceReadID(virPCIDevicePtr dev, const char *id_name)
{
g_autofree char *path = NULL;
g_autofree char *id_str = NULL;
path = virPCIFile(dev->name, id_name);
/* ID string is '0xNNNN\n' ... i.e. 7 bytes */
if (virFileReadAll(path, 7, &id_str) < 0)
return NULL;
/* Check for 0x suffix */
if (id_str[0] != '0' || id_str[1] != 'x')
return NULL;
/* Chop off the newline; we know the string is 7 bytes */
id_str[6] = '\0';
return g_steal_pointer(&id_str);
}
bool
virPCIDeviceAddressIsValid(virPCIDeviceAddressPtr addr,
bool report)
{
if (addr->bus > 0xFF) {
if (report)
virReportError(VIR_ERR_XML_ERROR,
_("Invalid PCI address bus='0x%x', "
"must be <= 0xFF"),
addr->bus);
return false;
}
if (addr->slot > 0x1F) {
if (report)
virReportError(VIR_ERR_XML_ERROR,
_("Invalid PCI address slot='0x%x', "
"must be <= 0x1F"),
addr->slot);
return false;
}
if (addr->function > 7) {
if (report)
virReportError(VIR_ERR_XML_ERROR,
_("Invalid PCI address function=0x%x, "
"must be <= 7"),
addr->function);
return false;
}
if (virPCIDeviceAddressIsEmpty(addr)) {
if (report)
virReportError(VIR_ERR_XML_ERROR, "%s",
_("Invalid PCI address 0000:00:00, at least "
"one of domain, bus, or slot must be > 0"));
return false;
}
return true;
}
bool
virPCIDeviceAddressIsEmpty(const virPCIDeviceAddress *addr)
{
return !(addr->domain || addr->bus || addr->slot);
}
bool
virPCIDeviceAddressEqual(const virPCIDeviceAddress *addr1,
const virPCIDeviceAddress *addr2)
{
if (addr1->domain == addr2->domain &&
addr1->bus == addr2->bus &&
addr1->slot == addr2->slot &&
addr1->function == addr2->function) {
return true;
}
return false;
}
/**
* virPCIDeviceAddressCopy:
* @dst: where to store address
* @src: source address to copy
*
* Creates a deep copy of given @src address and stores it into
* @dst which has to be pre-allocated by caller.
*/
void virPCIDeviceAddressCopy(virPCIDeviceAddressPtr dst,
const virPCIDeviceAddress *src)
{
memcpy(dst, src, sizeof(*src));
}
char *
virPCIDeviceAddressAsString(const virPCIDeviceAddress *addr)
{
char *str;
str = g_strdup_printf(VIR_PCI_DEVICE_ADDRESS_FMT,
addr->domain,
addr->bus,
addr->slot,
addr->function);
return str;
}
virPCIDevicePtr
virPCIDeviceNew(unsigned int domain,
unsigned int bus,
unsigned int slot,
unsigned int function)
{
g_autoptr(virPCIDevice) dev = NULL;
g_autofree char *vendor = NULL;
g_autofree char *product = NULL;
dev = g_new0(virPCIDevice, 1);
dev->address.domain = domain;
dev->address.bus = bus;
dev->address.slot = slot;
dev->address.function = function;
dev->name = g_strdup_printf(VIR_PCI_DEVICE_ADDRESS_FMT, domain, bus, slot,
function);
dev->path = g_strdup_printf(PCI_SYSFS "devices/%s/config", dev->name);
if (!virFileExists(dev->path)) {
virReportSystemError(errno,
_("Device %s not found: could not access %s"),
dev->name, dev->path);
return NULL;
}
vendor = virPCIDeviceReadID(dev, "vendor");
product = virPCIDeviceReadID(dev, "device");
if (!vendor || !product) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("Failed to read product/vendor ID for %s"),
dev->name);
return NULL;
}
/* strings contain '0x' prefix */
if (g_snprintf(dev->id, sizeof(dev->id), "%s %s", &vendor[2],
&product[2]) >= sizeof(dev->id)) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("dev->id buffer overflow: %s %s"),
&vendor[2], &product[2]);
return NULL;
}
VIR_DEBUG("%s %s: initialized", dev->id, dev->name);
return g_steal_pointer(&dev);
}
virPCIDevicePtr
virPCIDeviceCopy(virPCIDevicePtr dev)
{
virPCIDevicePtr copy;
copy = g_new0(virPCIDevice, 1);
/* shallow copy to take care of most attributes */
*copy = *dev;
copy->path = NULL;
copy->used_by_drvname = copy->used_by_domname = NULL;
copy->name = g_strdup(dev->name);
copy->path = g_strdup(dev->path);
copy->used_by_drvname = g_strdup(dev->used_by_drvname);
copy->used_by_domname = g_strdup(dev->used_by_domname);
return copy;
}
void
virPCIDeviceFree(virPCIDevicePtr dev)
{
if (!dev)
return;
VIR_DEBUG("%s %s: freeing", dev->id, dev->name);
VIR_FREE(dev->name);
VIR_FREE(dev->path);
VIR_FREE(dev->used_by_drvname);
VIR_FREE(dev->used_by_domname);
VIR_FREE(dev);
}
/**
* virPCIDeviceGetAddress:
* @dev: device to get address from
*
* Take a PCI device on input and return its PCI address. The
* returned object is owned by the device and must not be freed.
*
* Returns: a pointer to the address, which can never be NULL.
*/
virPCIDeviceAddressPtr
virPCIDeviceGetAddress(virPCIDevicePtr dev)
{
return &(dev->address);
}
const char *
virPCIDeviceGetName(virPCIDevicePtr dev)
{
return dev->name;
}
/**
* virPCIDeviceGetConfigPath:
*
* Returns a pointer to a string containing the path of @dev's PCI
* config file.
*/
const char *
virPCIDeviceGetConfigPath(virPCIDevicePtr dev)
{
return dev->path;
}
void virPCIDeviceSetManaged(virPCIDevicePtr dev, bool managed)
{
dev->managed = managed;
}
bool
virPCIDeviceGetManaged(virPCIDevicePtr dev)
{
return dev->managed;
}
void
virPCIDeviceSetStubDriver(virPCIDevicePtr dev, virPCIStubDriver driver)
{
dev->stubDriver = driver;
}
virPCIStubDriver
virPCIDeviceGetStubDriver(virPCIDevicePtr dev)
{
return dev->stubDriver;
}
bool
virPCIDeviceGetUnbindFromStub(virPCIDevicePtr dev)
{
return dev->unbind_from_stub;
}
void
virPCIDeviceSetUnbindFromStub(virPCIDevicePtr dev, bool unbind)
{
dev->unbind_from_stub = unbind;
}
bool
virPCIDeviceGetRemoveSlot(virPCIDevicePtr dev)
{
return dev->remove_slot;
}
void
virPCIDeviceSetRemoveSlot(virPCIDevicePtr dev, bool remove_slot)
{
dev->remove_slot = remove_slot;
}
bool
virPCIDeviceGetReprobe(virPCIDevicePtr dev)
{
return dev->reprobe;
}
void
virPCIDeviceSetReprobe(virPCIDevicePtr dev, bool reprobe)
{
dev->reprobe = reprobe;
}
int
virPCIDeviceSetUsedBy(virPCIDevicePtr dev,
const char *drv_name,
const char *dom_name)
{
VIR_FREE(dev->used_by_drvname);
VIR_FREE(dev->used_by_domname);
dev->used_by_drvname = g_strdup(drv_name);
dev->used_by_domname = g_strdup(dom_name);
return 0;
}
void
virPCIDeviceGetUsedBy(virPCIDevicePtr dev,
const char **drv_name,
const char **dom_name)
{
*drv_name = dev->used_by_drvname;
*dom_name = dev->used_by_domname;
}
virPCIDeviceListPtr
virPCIDeviceListNew(void)
{
virPCIDeviceListPtr list;
if (virPCIInitialize() < 0)
return NULL;
if (!(list = virObjectLockableNew(virPCIDeviceListClass)))
return NULL;
return list;
}
static void
virPCIDeviceListDispose(void *obj)
{
virPCIDeviceListPtr list = obj;
size_t i;
for (i = 0; i < list->count; i++) {
virPCIDeviceFree(list->devs[i]);
list->devs[i] = NULL;
}
list->count = 0;
VIR_FREE(list->devs);
}
int
virPCIDeviceListAdd(virPCIDeviceListPtr list,
virPCIDevicePtr dev)
{
if (virPCIDeviceListFind(list, dev)) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("Device %s is already in use"), dev->name);
return -1;
}
return VIR_APPEND_ELEMENT(list->devs, list->count, dev);
}
/* virPCIDeviceListAddCopy - add a *copy* of the device to this list */
int
virPCIDeviceListAddCopy(virPCIDeviceListPtr list, virPCIDevicePtr dev)
{
g_autoptr(virPCIDevice) copy = virPCIDeviceCopy(dev);
if (!copy)
return -1;
if (virPCIDeviceListAdd(list, copy) < 0)
return -1;
copy = NULL;
return 0;
}
virPCIDevicePtr
virPCIDeviceListGet(virPCIDeviceListPtr list,
int idx)
{
if (idx >= list->count)
return NULL;
if (idx < 0)
return NULL;
return list->devs[idx];
}
size_t
virPCIDeviceListCount(virPCIDeviceListPtr list)
{
return list->count;
}
virPCIDevicePtr
virPCIDeviceListStealIndex(virPCIDeviceListPtr list,
int idx)
{
virPCIDevicePtr ret;
if (idx < 0 || idx >= list->count)
return NULL;
ret = list->devs[idx];
VIR_DELETE_ELEMENT(list->devs, idx, list->count);
return ret;
}
virPCIDevicePtr
virPCIDeviceListSteal(virPCIDeviceListPtr list,
virPCIDevicePtr dev)
{
return virPCIDeviceListStealIndex(list, virPCIDeviceListFindIndex(list, dev));
}
void
virPCIDeviceListDel(virPCIDeviceListPtr list,
virPCIDevicePtr dev)
{
virPCIDeviceFree(virPCIDeviceListSteal(list, dev));
}
int
virPCIDeviceListFindIndex(virPCIDeviceListPtr list, virPCIDevicePtr dev)
{
size_t i;
for (i = 0; i < list->count; i++) {
virPCIDevicePtr other = list->devs[i];
if (other->address.domain == dev->address.domain &&
other->address.bus == dev->address.bus &&
other->address.slot == dev->address.slot &&
other->address.function == dev->address.function)
return i;
}
return -1;
}
virPCIDevicePtr
virPCIDeviceListFindByIDs(virPCIDeviceListPtr list,
unsigned int domain,
unsigned int bus,
unsigned int slot,
unsigned int function)
{
size_t i;
for (i = 0; i < list->count; i++) {
virPCIDevicePtr other = list->devs[i];
if (other->address.domain == domain &&
other->address.bus == bus &&
other->address.slot == slot &&
other->address.function == function)
return list->devs[i];
}
return NULL;
}
virPCIDevicePtr
virPCIDeviceListFind(virPCIDeviceListPtr list, virPCIDevicePtr dev)
{
int idx;
if ((idx = virPCIDeviceListFindIndex(list, dev)) >= 0)
return list->devs[idx];
else
return NULL;
}
int virPCIDeviceFileIterate(virPCIDevicePtr dev,
virPCIDeviceFileActor actor,
void *opaque)
{
g_autofree char *pcidir = NULL;
g_autoptr(DIR) dir = NULL;
struct dirent *ent;
int direrr;
pcidir = g_strdup_printf("/sys/bus/pci/devices/" VIR_PCI_DEVICE_ADDRESS_FMT,
dev->address.domain, dev->address.bus, dev->address.slot,
dev->address.function);
if (virDirOpen(&dir, pcidir) < 0)
return -1;
while ((direrr = virDirRead(dir, &ent, pcidir)) > 0) {
g_autofree char *file = NULL;
/* Device assignment requires:
* $PCIDIR/config, $PCIDIR/resource, $PCIDIR/resourceNNN,
* $PCIDIR/rom, $PCIDIR/reset, $PCIDIR/vendor, $PCIDIR/device
*/
if (STREQ(ent->d_name, "config") ||
STRPREFIX(ent->d_name, "resource") ||
STREQ(ent->d_name, "rom") ||
STREQ(ent->d_name, "vendor") ||
STREQ(ent->d_name, "device") ||
STREQ(ent->d_name, "reset")) {
file = g_strdup_printf("%s/%s", pcidir, ent->d_name);
if ((actor)(dev, file, opaque) < 0)
return -1;
}
}
if (direrr < 0)
return -1;
return 0;
}
/* virPCIDeviceAddressIOMMUGroupIterate:
* Call @actor for all devices in the same iommu_group as orig
* (including orig itself) Even if there is no iommu_group for the
* device, call @actor once for orig.
*/
int
virPCIDeviceAddressIOMMUGroupIterate(virPCIDeviceAddressPtr orig,
virPCIDeviceAddressActor actor,
void *opaque)
{
g_autofree char *groupPath = NULL;
g_autoptr(DIR) groupDir = NULL;
struct dirent *ent;
int direrr;
groupPath = g_strdup_printf(PCI_SYSFS "devices/" VIR_PCI_DEVICE_ADDRESS_FMT "/iommu_group/devices",
orig->domain, orig->bus, orig->slot, orig->function);
if (virDirOpenQuiet(&groupDir, groupPath) < 0) {
/* just process the original device, nothing more */
return (actor)(orig, opaque);
}
while ((direrr = virDirRead(groupDir, &ent, groupPath)) > 0) {
virPCIDeviceAddress newDev;
if (virPCIDeviceAddressParse(ent->d_name, &newDev) < 0) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("Found invalid device link '%s' in '%s'"),
ent->d_name, groupPath);
return -1;
}
if ((actor)(&newDev, opaque) < 0)
return -1;
}
if (direrr < 0)
return -1;
return 0;
}
static int
virPCIDeviceGetIOMMUGroupAddOne(virPCIDeviceAddressPtr newDevAddr, void *opaque)
{
virPCIDeviceListPtr groupList = opaque;
g_autoptr(virPCIDevice) newDev = NULL;
if (!(newDev = virPCIDeviceNew(newDevAddr->domain, newDevAddr->bus,
newDevAddr->slot, newDevAddr->function)))
return -1;
if (virPCIDeviceListAdd(groupList, newDev) < 0)
return -1;
newDev = NULL; /* it's now on the list */
return 0;
}
/*
* virPCIDeviceGetIOMMUGroupList - return a virPCIDeviceList containing
* all of the devices in the same iommu_group as @dev.
*
* Return the new list, or NULL on failure
*/
virPCIDeviceListPtr
virPCIDeviceGetIOMMUGroupList(virPCIDevicePtr dev)
{
virPCIDeviceListPtr groupList = virPCIDeviceListNew();
if (!groupList)
goto error;
if (virPCIDeviceAddressIOMMUGroupIterate(&(dev->address),
virPCIDeviceGetIOMMUGroupAddOne,
groupList) < 0)
goto error;
return groupList;
error:
virObjectUnref(groupList);
return NULL;
}
typedef struct {
virPCIDeviceAddressPtr **iommuGroupDevices;
size_t *nIommuGroupDevices;
} virPCIDeviceAddressList;
typedef virPCIDeviceAddressList *virPCIDeviceAddressListPtr;
static int
virPCIGetIOMMUGroupAddressesAddOne(virPCIDeviceAddressPtr newDevAddr, void *opaque)
{
virPCIDeviceAddressListPtr addrList = opaque;
g_autofree virPCIDeviceAddressPtr copyAddr = NULL;
/* make a copy to insert onto the list */
copyAddr = g_new0(virPCIDeviceAddress, 1);
*copyAddr = *newDevAddr;
if (VIR_APPEND_ELEMENT(*addrList->iommuGroupDevices,
*addrList->nIommuGroupDevices, copyAddr) < 0)
return -1;
return 0;
}
/*
* virPCIDeviceAddressGetIOMMUGroupAddresses - return a
* virPCIDeviceList containing all of the devices in the same
* iommu_group as @dev.
*
* Return the new list, or NULL on failure
*/
int
virPCIDeviceAddressGetIOMMUGroupAddresses(virPCIDeviceAddressPtr devAddr,
virPCIDeviceAddressPtr **iommuGroupDevices,
size_t *nIommuGroupDevices)
{
virPCIDeviceAddressList addrList = { iommuGroupDevices,
nIommuGroupDevices };
if (virPCIDeviceAddressIOMMUGroupIterate(devAddr,
virPCIGetIOMMUGroupAddressesAddOne,
&addrList) < 0)
return -1;
return 0;
}
/* virPCIDeviceAddressGetIOMMUGroupNum - return the group number of
* this PCI device's iommu_group, or -2 if there is no iommu_group for
* the device (or -1 if there was any other error)
*/
int
virPCIDeviceAddressGetIOMMUGroupNum(virPCIDeviceAddressPtr addr)
{
g_autofree char *devName = NULL;
g_autofree char *devPath = NULL;
g_autofree char *groupPath = NULL;
g_autofree char *groupNumStr = NULL;
unsigned int groupNum;
devName = g_strdup_printf(VIR_PCI_DEVICE_ADDRESS_FMT, addr->domain, addr->bus,
addr->slot, addr->function);
devPath = virPCIFile(devName, "iommu_group");
if (virFileIsLink(devPath) != 1)
return -2;
if (virFileResolveLink(devPath, &groupPath) < 0) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("Unable to resolve device %s iommu_group symlink %s"),
devName, devPath);
return -1;
}
groupNumStr = g_path_get_basename(groupPath);
if (virStrToLong_ui(groupNumStr, NULL, 10, &groupNum) < 0) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("device %s iommu_group symlink %s has "
"invalid group number %s"),
devName, groupPath, groupNumStr);
return -1;
}
return groupNum;
}
char *
virPCIDeviceAddressGetIOMMUGroupDev(const virPCIDeviceAddress *devAddr)
{
g_autoptr(virPCIDevice) pci = NULL;
if (!(pci = virPCIDeviceNew(devAddr->domain,
devAddr->bus,
devAddr->slot,
devAddr->function)))
return NULL;
return virPCIDeviceGetIOMMUGroupDev(pci);
}
/* virPCIDeviceGetIOMMUGroupDev - return the name of the device used
* to control this PCI device's group (e.g. "/dev/vfio/15")
*/
char *
virPCIDeviceGetIOMMUGroupDev(virPCIDevicePtr dev)
{
g_autofree char *devPath = NULL;
g_autofree char *groupPath = NULL;
g_autofree char *groupFile = NULL;
devPath = virPCIFile(dev->name, "iommu_group");
if (virFileIsLink(devPath) != 1) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("Invalid device %s iommu_group file %s is not a symlink"),
dev->name, devPath);
return NULL;
}
if (virFileResolveLink(devPath, &groupPath) < 0) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("Unable to resolve device %s iommu_group symlink %s"),
dev->name, devPath);
return NULL;
}
groupFile = g_path_get_basename(groupPath);
return g_strdup_printf("/dev/vfio/%s", groupFile);
}
static int
virPCIDeviceDownstreamLacksACS(virPCIDevicePtr dev)
{
uint16_t flags;
uint16_t ctrl;
unsigned int pos;
int fd;
int ret = 0;
uint16_t device_class;
if ((fd = virPCIDeviceConfigOpen(dev)) < 0)
return -1;
if (virPCIDeviceInit(dev, fd) < 0) {
ret = -1;
goto cleanup;
}
if (virPCIDeviceReadClass(dev, &device_class) < 0)
goto cleanup;
pos = dev->pcie_cap_pos;
if (!pos || device_class != PCI_CLASS_BRIDGE_PCI)
goto cleanup;
flags = virPCIDeviceRead16(dev, fd, pos + PCI_EXP_FLAGS);
if (((flags & PCI_EXP_FLAGS_TYPE) >> 4) != PCI_EXP_TYPE_DOWNSTREAM)
goto cleanup;
pos = virPCIDeviceFindExtendedCapabilityOffset(dev, fd, PCI_EXT_CAP_ID_ACS);
if (!pos) {
VIR_DEBUG("%s %s: downstream port lacks ACS", dev->id, dev->name);
ret = 1;
goto cleanup;
}
ctrl = virPCIDeviceRead16(dev, fd, pos + PCI_EXT_ACS_CTRL);
if ((ctrl & PCI_EXT_CAP_ACS_ENABLED) != PCI_EXT_CAP_ACS_ENABLED) {
VIR_DEBUG("%s %s: downstream port has ACS disabled",
dev->id, dev->name);
ret = 1;
goto cleanup;
}
cleanup:
virPCIDeviceConfigClose(dev, fd);
return ret;
}
static int
virPCIDeviceIsBehindSwitchLackingACS(virPCIDevicePtr dev)
{
g_autoptr(virPCIDevice) parent = NULL;
if (virPCIDeviceGetParent(dev, &parent) < 0)
return -1;
if (!parent) {
/* if we have no parent, and this is the root bus, ACS doesn't come
* into play since devices on the root bus can't P2P without going
* through the root IOMMU.
*/
if (dev->address.bus == 0) {
return 0;
} else {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("Failed to find parent device for %s"),
dev->name);
return -1;
}
}
/* XXX we should rather fail when we can't find device's parent and
* stop the loop when we get to root instead of just stopping when no
* parent can be found
*/
do {
g_autoptr(virPCIDevice) tmp = NULL;
int acs;
int ret;
acs = virPCIDeviceDownstreamLacksACS(parent);
if (acs) {
if (acs < 0)
return -1;
else
return 1;
}
tmp = parent;
ret = virPCIDeviceGetParent(parent, &parent);
if (ret < 0)
return -1;
} while (parent);
return 0;
}
int virPCIDeviceIsAssignable(virPCIDevicePtr dev,
int strict_acs_check)
{
int ret;
/* XXX This could be a great place to actually check that a non-managed
* device isn't in use, e.g. by checking that device is either un-bound
* or bound to a stub driver.
*/
ret = virPCIDeviceIsBehindSwitchLackingACS(dev);
if (ret < 0)
return 0;
if (ret) {
if (!strict_acs_check) {
VIR_DEBUG("%s %s: strict ACS check disabled; device assignment allowed",
dev->id, dev->name);
} else {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("Device %s is behind a switch lacking ACS and "
"cannot be assigned"),
dev->name);
return 0;
}
}
return 1;
}
static int
logStrToLong_ui(char const *s,
char **end_ptr,
int base,
unsigned int *result)
{
int ret = 0;
ret = virStrToLong_ui(s, end_ptr, base, result);
if (ret != 0)
VIR_ERROR(_("Failed to convert '%s' to unsigned int"), s);
return ret;
}
int
virPCIDeviceAddressParse(char *address,
virPCIDeviceAddressPtr bdf)
{
char *p = NULL;
if ((address == NULL) || (logStrToLong_ui(address, &p, 16,
&bdf->domain) == -1)) {
return -1;
}
if ((p == NULL) || (logStrToLong_ui(p+1, &p, 16,
&bdf->bus) == -1)) {
return -1;
}
if ((p == NULL) || (logStrToLong_ui(p+1, &p, 16,
&bdf->slot) == -1)) {
return -1;
}
if ((p == NULL) || (logStrToLong_ui(p+1, &p, 16,
&bdf->function) == -1)) {
return -1;
}
return 0;
}
bool
virZPCIDeviceAddressIsIncomplete(const virZPCIDeviceAddress *addr)
{
return !addr->uid.isSet || !addr->fid.isSet;
}
bool
virZPCIDeviceAddressIsPresent(const virZPCIDeviceAddress *addr)
{
return addr->uid.isSet || addr->fid.isSet;
}
#ifdef __linux__
virPCIDeviceAddressPtr
virPCIGetDeviceAddressFromSysfsLink(const char *device_link)
{
g_autofree virPCIDeviceAddressPtr bdf = NULL;
g_autofree char *config_address = NULL;
g_autofree char *device_path = NULL;
if (!virFileExists(device_link)) {
VIR_DEBUG("'%s' does not exist", device_link);
return NULL;
}
device_path = virFileCanonicalizePath(device_link);
if (device_path == NULL) {
virReportSystemError(errno,
_("Failed to resolve device link '%s'"),
device_link);
return NULL;
}
config_address = g_path_get_basename(device_path);
bdf = g_new0(virPCIDeviceAddress, 1);
if (virPCIDeviceAddressParse(config_address, bdf) < 0) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("Failed to parse PCI config address '%s'"),
config_address);
return NULL;
}
return g_steal_pointer(&bdf);
}
/**
* virPCIGetPhysicalFunction:
* @vf_sysfs_path: sysfs path for the virtual function
* @pf: where to store the physical function's address
*
* Given @vf_sysfs_path, this function will store the pointer
* to a newly-allocated virPCIDeviceAddress in @pf.
*
* @pf might be NULL if @vf_sysfs_path does not point to a
* virtual function. If it's not NULL, then it should be
* freed by the caller when no longer needed.
*
* Returns: >=0 on success, <0 on failure
*/
int
virPCIGetPhysicalFunction(const char *vf_sysfs_path,
virPCIDeviceAddressPtr *pf)
{
g_autofree char *device_link = NULL;
*pf = NULL;
if (virBuildPath(&device_link, vf_sysfs_path, "physfn") == -1) {
virReportOOMError();
return -1;
}
if ((*pf = virPCIGetDeviceAddressFromSysfsLink(device_link))) {
VIR_DEBUG("PF for VF device '%s': " VIR_PCI_DEVICE_ADDRESS_FMT,
vf_sysfs_path,
(*pf)->domain, (*pf)->bus, (*pf)->slot, (*pf)->function);
}
return 0;
}
/*
* Returns virtual functions of a physical function
*/
int
virPCIGetVirtualFunctions(const char *sysfs_path,
virPCIDeviceAddressPtr **virtual_functions,
size_t *num_virtual_functions,
unsigned int *max_virtual_functions)
{
size_t i;
g_autofree char *totalvfs_file = NULL;
g_autofree char *totalvfs_str = NULL;
g_autofree virPCIDeviceAddressPtr config_addr = NULL;
*virtual_functions = NULL;
*num_virtual_functions = 0;
*max_virtual_functions = 0;
totalvfs_file = g_strdup_printf("%s/sriov_totalvfs", sysfs_path);
if (virFileExists(totalvfs_file)) {
char *end = NULL; /* so that terminating \n doesn't create error */
if (virFileReadAll(totalvfs_file, 16, &totalvfs_str) < 0)
goto error;
if (virStrToLong_ui(totalvfs_str, &end, 10, max_virtual_functions) < 0) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("Unrecognized value in %s: %s"),
totalvfs_file, totalvfs_str);
goto error;
}
}
do {
g_autofree char *device_link = NULL;
/* look for virtfn%d links until one isn't found */
device_link = g_strdup_printf("%s/virtfn%zu", sysfs_path,
*num_virtual_functions);
if (!virFileExists(device_link))
break;
if (!(config_addr = virPCIGetDeviceAddressFromSysfsLink(device_link))) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("Failed to get SRIOV function from device link '%s'"),
device_link);
goto error;
}
if (VIR_APPEND_ELEMENT(*virtual_functions, *num_virtual_functions,
config_addr) < 0)
goto error;
} while (1);
VIR_DEBUG("Found %zu virtual functions for %s",
*num_virtual_functions, sysfs_path);
return 0;
error:
for (i = 0; i < *num_virtual_functions; i++)
VIR_FREE((*virtual_functions)[i]);
VIR_FREE(*virtual_functions);
*num_virtual_functions = 0;
return -1;
}
/*
* Returns 1 if vf device is a virtual function, 0 if not, -1 on error
*/
int
virPCIIsVirtualFunction(const char *vf_sysfs_device_link)
{
g_autofree char *vf_sysfs_physfn_link = NULL;
vf_sysfs_physfn_link = g_strdup_printf("%s/physfn", vf_sysfs_device_link);
return virFileExists(vf_sysfs_physfn_link);
}
/*
* Returns the sriov virtual function index of vf given its pf
*/
int
virPCIGetVirtualFunctionIndex(const char *pf_sysfs_device_link,
const char *vf_sysfs_device_link,
int *vf_index)
{
int ret = -1;
size_t i;
size_t num_virt_fns = 0;
unsigned int max_virt_fns = 0;
g_autofree virPCIDeviceAddressPtr vf_bdf = NULL;
virPCIDeviceAddressPtr *virt_fns = NULL;
if (!(vf_bdf = virPCIGetDeviceAddressFromSysfsLink(vf_sysfs_device_link)))
return ret;
if (virPCIGetVirtualFunctions(pf_sysfs_device_link, &virt_fns,
&num_virt_fns, &max_virt_fns) < 0) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("Error getting physical function's '%s' "
"virtual_functions"), pf_sysfs_device_link);
goto out;
}
for (i = 0; i < num_virt_fns; i++) {
if (virPCIDeviceAddressEqual(vf_bdf, virt_fns[i])) {
*vf_index = i;
ret = 0;
break;
}
}
out:
/* free virtual functions */
for (i = 0; i < num_virt_fns; i++)
VIR_FREE(virt_fns[i]);
VIR_FREE(virt_fns);
return ret;
}
/*
* Returns a path to the PCI sysfs file given the BDF of the PCI function
*/
int
virPCIDeviceAddressGetSysfsFile(virPCIDeviceAddressPtr addr,
char **pci_sysfs_device_link)
{
*pci_sysfs_device_link = g_strdup_printf(PCI_SYSFS "devices/" VIR_PCI_DEVICE_ADDRESS_FMT, addr->domain,
addr->bus, addr->slot, addr->function);
return 0;
}
/**
* virPCIGetNetName:
* @device_link_sysfs_path: sysfs path to the PCI device
* @idx: used to choose which netdev when there are several
* (ignored if physPortID is set)
* @physPortID: match this string in the netdev's phys_port_id
* (or NULL to ignore and use idx instead)
* @netname: used to return the name of the netdev
* (set to NULL (but returns success) if there is no netdev)
*
* Returns 0 on success, -1 on error (error has been logged)
*/
int
virPCIGetNetName(const char *device_link_sysfs_path,
size_t idx,
char *physPortID,
char **netname)
{
g_autofree char *pcidev_sysfs_net_path = NULL;
g_autofree char *firstEntryName = NULL;
g_autoptr(DIR) dir = NULL;
struct dirent *entry = NULL;
size_t i = 0;
*netname = NULL;
if (virBuildPath(&pcidev_sysfs_net_path, device_link_sysfs_path,
"net") == -1) {
virReportOOMError();
return -1;
}
if (virDirOpenQuiet(&dir, pcidev_sysfs_net_path) < 0) {
/* this *isn't* an error - caller needs to check for netname == NULL */
return 0;
}
while (virDirRead(dir, &entry, pcidev_sysfs_net_path) > 0) {
/* if the caller sent a physPortID, compare it to the
* physportID of this netdev. If not, look for entry[idx].
*/
if (physPortID) {
g_autofree char *thisPhysPortID = NULL;
if (virNetDevGetPhysPortID(entry->d_name, &thisPhysPortID) < 0)
return -1;
/* if this one doesn't match, keep looking */
if (STRNEQ_NULLABLE(physPortID, thisPhysPortID)) {
/* save the first entry we find to use as a failsafe
* in case we don't match the phys_port_id. This is
* needed because some NIC drivers (e.g. i40e)
* implement phys_port_id for PFs, but not for VFs
*/
if (!firstEntryName)
firstEntryName = g_strdup(entry->d_name);
continue;
}
} else {
if (i++ < idx)
continue;
}
*netname = g_strdup(entry->d_name);
return 0;
}
if (!physPortID)
return 0;
if (firstEntryName) {
/* we didn't match the provided phys_port_id, but this
* is probably because phys_port_id isn't implemented
* for this NIC driver, so just return the first
* (probably only) netname we found.
*/
*netname = g_steal_pointer(&firstEntryName);
return 0;
}
virReportError(VIR_ERR_INTERNAL_ERROR,
_("Could not find network device with "
"phys_port_id '%s' under PCI device at %s"),
physPortID, device_link_sysfs_path);
return -1;
}
int
virPCIGetVirtualFunctionInfo(const char *vf_sysfs_device_path,
int pfNetDevIdx,
char **pfname,
int *vf_index)
{
g_autofree virPCIDeviceAddressPtr pf_config_address = NULL;
g_autofree char *pf_sysfs_device_path = NULL;
g_autofree char *vfname = NULL;
g_autofree char *vfPhysPortID = NULL;
if (virPCIGetPhysicalFunction(vf_sysfs_device_path, &pf_config_address) < 0)
return -1;
if (!pf_config_address)
return -1;
if (virPCIDeviceAddressGetSysfsFile(pf_config_address,
&pf_sysfs_device_path) < 0) {
return -1;
}
if (virPCIGetVirtualFunctionIndex(pf_sysfs_device_path,
vf_sysfs_device_path, vf_index) < 0) {
return -1;
}
/* If the caller hasn't asked for a specific pfNetDevIdx, and VF
* is bound to a netdev, learn that netdev's phys_port_id (if
* available). This can be used to disambiguate when the PF has
* multiple netdevs. If the VF isn't bound to a netdev, then we
* return netdev[pfNetDevIdx] on the PF, which may or may not be
* correct.
*/
if (pfNetDevIdx == -1) {
if (virPCIGetNetName(vf_sysfs_device_path, 0, NULL, &vfname) < 0)
return -1;
if (vfname) {
if (virNetDevGetPhysPortID(vfname, &vfPhysPortID) < 0)
return -1;
}
pfNetDevIdx = 0;
}
if (virPCIGetNetName(pf_sysfs_device_path,
pfNetDevIdx, vfPhysPortID, pfname) < 0) {
return -1;
}
if (!*pfname) {
/* this shouldn't be possible. A VF can't exist unless its
* PF device is bound to a network driver
*/
virReportError(VIR_ERR_INTERNAL_ERROR,
_("The PF device for VF %s has no network device name"),
vf_sysfs_device_path);
return -1;
}
return 0;
}
#else
static const char *unsupported = N_("not supported on non-linux platforms");
virPCIDeviceAddressPtr
virPCIGetDeviceAddressFromSysfsLink(const char *device_link G_GNUC_UNUSED)
{
virReportError(VIR_ERR_INTERNAL_ERROR, "%s", _(unsupported));
return NULL;
}
int
virPCIGetPhysicalFunction(const char *vf_sysfs_path G_GNUC_UNUSED,
virPCIDeviceAddressPtr *pf G_GNUC_UNUSED)
{
virReportError(VIR_ERR_INTERNAL_ERROR, "%s", _(unsupported));
return -1;
}
int
virPCIGetVirtualFunctions(const char *sysfs_path G_GNUC_UNUSED,
virPCIDeviceAddressPtr **virtual_functions G_GNUC_UNUSED,
size_t *num_virtual_functions G_GNUC_UNUSED,
unsigned int *max_virtual_functions G_GNUC_UNUSED)
{
virReportError(VIR_ERR_INTERNAL_ERROR, "%s", _(unsupported));
return -1;
}
int
virPCIIsVirtualFunction(const char *vf_sysfs_device_link G_GNUC_UNUSED)
{
virReportError(VIR_ERR_INTERNAL_ERROR, "%s", _(unsupported));
return -1;
}
int
virPCIGetVirtualFunctionIndex(const char *pf_sysfs_device_link G_GNUC_UNUSED,
const char *vf_sysfs_device_link G_GNUC_UNUSED,
int *vf_index G_GNUC_UNUSED)
{
virReportError(VIR_ERR_INTERNAL_ERROR, "%s", _(unsupported));
return -1;
}
int
virPCIDeviceAddressGetSysfsFile(virPCIDeviceAddressPtr dev G_GNUC_UNUSED,
char **pci_sysfs_device_link G_GNUC_UNUSED)
{
virReportError(VIR_ERR_INTERNAL_ERROR, "%s", _(unsupported));
return -1;
}
int
virPCIGetNetName(const char *device_link_sysfs_path G_GNUC_UNUSED,
size_t idx G_GNUC_UNUSED,
char *physPortID G_GNUC_UNUSED,
char **netname G_GNUC_UNUSED)
{
virReportError(VIR_ERR_INTERNAL_ERROR, "%s", _(unsupported));
return -1;
}
int
virPCIGetVirtualFunctionInfo(const char *vf_sysfs_device_path G_GNUC_UNUSED,
int pfNetDevIdx G_GNUC_UNUSED,
char **pfname G_GNUC_UNUSED,
int *vf_index G_GNUC_UNUSED)
{
virReportError(VIR_ERR_INTERNAL_ERROR, "%s", _(unsupported));
return -1;
}
#endif /* __linux__ */
int
virPCIDeviceIsPCIExpress(virPCIDevicePtr dev)
{
int fd;
int ret = -1;
if ((fd = virPCIDeviceConfigOpen(dev)) < 0)
return ret;
if (virPCIDeviceInit(dev, fd) < 0)
goto cleanup;
ret = dev->is_pcie;
cleanup:
virPCIDeviceConfigClose(dev, fd);
return ret;
}
int
virPCIDeviceHasPCIExpressLink(virPCIDevicePtr dev)
{
int fd;
int ret = -1;
uint16_t cap, type;
if ((fd = virPCIDeviceConfigOpen(dev)) < 0)
return ret;
if (virPCIDeviceInit(dev, fd) < 0)
goto cleanup;
cap = virPCIDeviceRead16(dev, fd, dev->pcie_cap_pos + PCI_CAP_FLAGS);
type = (cap & PCI_EXP_FLAGS_TYPE) >> 4;
ret = type != PCI_EXP_TYPE_ROOT_INT_EP && type != PCI_EXP_TYPE_ROOT_EC;
cleanup:
virPCIDeviceConfigClose(dev, fd);
return ret;
}
int
virPCIDeviceGetLinkCapSta(virPCIDevicePtr dev,
int *cap_port,
unsigned int *cap_speed,
unsigned int *cap_width,
unsigned int *sta_speed,
unsigned int *sta_width)
{
uint32_t t;
int fd;
int ret = -1;
if ((fd = virPCIDeviceConfigOpen(dev)) < 0)
return ret;
if (virPCIDeviceInit(dev, fd) < 0)
goto cleanup;
if (!dev->pcie_cap_pos) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("pci device %s is not a PCI-Express device"),
dev->name);
goto cleanup;
}
t = virPCIDeviceRead32(dev, fd, dev->pcie_cap_pos + PCI_EXP_LNKCAP);
*cap_port = t >> 24;
*cap_speed = t & PCI_EXP_LNKCAP_SPEED;
*cap_width = (t & PCI_EXP_LNKCAP_WIDTH) >> 4;
t = virPCIDeviceRead16(dev, fd, dev->pcie_cap_pos + PCI_EXP_LNKSTA);
*sta_speed = t & PCI_EXP_LNKSTA_SPEED;
*sta_width = (t & PCI_EXP_LNKSTA_WIDTH) >> 4;
ret = 0;
cleanup:
virPCIDeviceConfigClose(dev, fd);
return ret;
}
int virPCIGetHeaderType(virPCIDevicePtr dev, int *hdrType)
{
int fd;
uint8_t type;
*hdrType = -1;
if ((fd = virPCIDeviceConfigOpen(dev)) < 0)
return -1;
type = virPCIDeviceRead8(dev, fd, PCI_HEADER_TYPE);
virPCIDeviceConfigClose(dev, fd);
type &= PCI_HEADER_TYPE_MASK;
if (type >= VIR_PCI_HEADER_LAST) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("Unknown PCI header type '%d' for device '%s'"),
type, dev->name);
return -1;
}
*hdrType = type;
return 0;
}
void
virPCIEDeviceInfoFree(virPCIEDeviceInfoPtr dev)
{
if (!dev)
return;
VIR_FREE(dev->link_cap);
VIR_FREE(dev->link_sta);
VIR_FREE(dev);
}
void
virPCIDeviceAddressFree(virPCIDeviceAddressPtr address)
{
VIR_FREE(address);
}
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