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libvirt/src/util/virpci.c
Peter Krempa ccac1c2623 virBuildPath: Remove return value 
The function can't fail nowadays, remove the return value and adjust
callers.

Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Laine Stump <laine@redhat.com>
2021-03-02 09:50:19 +01:00

2835 lines
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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;
};
#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) {
g_autoptr(virPCIDevice) check = NULL;
virPCIDeviceAddress devAddr;
char *tmp;
/* expected format: <domain>:<bus>:<slot>.<function> */
if (/* domain */
virStrToLong_ui(entry->d_name, &tmp, 16, &devAddr.domain) < 0 || *tmp != ':' ||
/* bus */
virStrToLong_ui(tmp + 1, &tmp, 16, &devAddr.bus) < 0 || *tmp != ':' ||
/* slot */
virStrToLong_ui(tmp + 1, &tmp, 16, &devAddr.slot) < 0 || *tmp != '.' ||
/* function */
virStrToLong_ui(tmp + 1, NULL, 16, &devAddr.function) < 0) {
VIR_WARN("Unusual entry in " PCI_SYSFS "devices: %s", entry->d_name);
continue;
}
check = virPCIDeviceNew(&devAddr);
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->address))
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);
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);
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->address)) {
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->address)) {
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->address)) {
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->address)) {
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->address);
}
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;
}
bool
virPCIDeviceExists(const virPCIDeviceAddress *addr)
{
g_autofree char *devName = virPCIDeviceAddressAsString(addr);
g_autofree char *devPath = g_strdup_printf(PCI_SYSFS "devices/%s/config",
devName);
return virFileExists(devPath);
}
virPCIDevicePtr
virPCIDeviceNew(const virPCIDeviceAddress *address)
{
g_autoptr(virPCIDevice) dev = NULL;
g_autofree char *vendor = NULL;
g_autofree char *product = NULL;
dev = g_new0(virPCIDevice, 1);
virPCIDeviceAddressCopy(&dev->address, address);
dev->name = virPCIDeviceAddressAsString(&dev->address);
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);
g_free(dev->name);
g_free(dev->path);
g_free(dev->used_by_drvname);
g_free(dev->used_by_domname);
g_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;
g_free(list->devs);
}
int
virPCIDeviceListAdd(virPCIDeviceListPtr list,
virPCIDevicePtr dev)
{
if (virPCIDeviceListFind(list, &dev->address)) {
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,
virPCIDeviceAddressPtr devAddr)
{
return virPCIDeviceListStealIndex(list, virPCIDeviceListFindIndex(list, devAddr));
}
void
virPCIDeviceListDel(virPCIDeviceListPtr list,
virPCIDeviceAddressPtr devAddr)
{
virPCIDeviceFree(virPCIDeviceListSteal(list, devAddr));
}
int
virPCIDeviceListFindIndex(virPCIDeviceListPtr list,
virPCIDeviceAddressPtr devAddr)
{
size_t i;
for (i = 0; i < list->count; i++) {
virPCIDevicePtr other = list->devs[i];
if (other->address.domain == devAddr->domain &&
other->address.bus == devAddr->bus &&
other->address.slot == devAddr->slot &&
other->address.function == devAddr->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, virPCIDeviceAddressPtr devAddr)
{
int idx;
if ((idx = virPCIDeviceListFindIndex(list, devAddr)) >= 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)))
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 = virPCIDeviceAddressAsString(addr);
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)))
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;
virBuildPath(&device_link, vf_sysfs_path, "physfn");
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 or physPortName is available)
* @physPortID: match this string in the netdev's phys_port_id
* (or NULL to ignore and use phys_port_name or 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;
virBuildPath(&pcidev_sysfs_net_path, device_link_sysfs_path, "net");
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) {
/* 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);
/* 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))
continue;
} else {
/* Most switch devices use phys_port_name instead of
* phys_port_id.
* NOTE: VFs' representors net devices can be linked to PF's PCI
* device, which mean that there'll be multiple net devices
* instances and to get a proper net device need to match on
* specific regex.
* To get PF netdev, for ex., used following regex:
* "(p[0-9]+$)|(p[0-9]+s[0-9]+$)"
* or to get exact VF's netdev next regex is used:
* "pf0vf1$"
*/
g_autofree char *thisPhysPortName = NULL;
if (virNetDevGetPhysPortName(entry->d_name, &thisPhysPortName) < 0)
return -1;
if (thisPhysPortName) {
/* if this one doesn't match, keep looking */
if (!virStringMatch(thisPhysPortName, VIR_PF_PHYS_PORT_NAME_REGEX))
continue;
} else {
if (i++ < idx)
continue;
}
}
*netname = g_strdup(entry->d_name);
return 0;
}
if (firstEntryName) {
/* we didn't match the provided phys_port_id / find a
* phys_port_name matching VIR_PF_PHYS_PORT_NAME_REGEX / find
* as many net devices as the value of idx, but this is
* probably because phys_port_id / phys_port_name 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 any network device under PCI device at %s"),
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;
if (dev->pcie_cap_pos == 0) {
ret = 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;
g_free(dev->link_cap);
g_free(dev->link_sta);
g_free(dev);
}
void
virPCIDeviceAddressFree(virPCIDeviceAddressPtr address)
{
g_free(address);
}
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