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libvirt/src/util/pci.c
Osier Yang f9ce7dad60 Desert the FSF address in copyright 
Per the FSF address could be changed from time to time, and GNU
recommends the following now: (http://www.gnu.org/licenses/gpl-howto.html)

  You should have received a copy of the GNU General Public License
  along with Foobar.  If not, see <http://www.gnu.org/licenses/>.

This patch removes the explicit FSF address, and uses above instead
(of course, with inserting 'Lesser' before 'General').

Except a bunch of files for security driver, all others are changed
automatically, the copyright for securify files are not complete,
that's why to do it manually:

  src/security/security_selinux.h
  src/security/security_driver.h
  src/security/security_selinux.c
  src/security/security_apparmor.h
  src/security/security_apparmor.c
  src/security/security_driver.c
2012-07-23 10:50:50 +08:00

2230 lines
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/*
* Copyright (C) 2009-2012 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/>.
*
* Authors:
* Mark McLoughlin <markmc@redhat.com>
*/
#include <config.h>
#include "pci.h"
#include <dirent.h>
#include <fcntl.h>
#include <inttypes.h>
#include <limits.h>
#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <stdlib.h>
#include "logging.h"
#include "memory.h"
#include "command.h"
#include "virterror_internal.h"
#include "virfile.h"
#define PCI_SYSFS "/sys/bus/pci/"
#define PCI_ID_LEN 10 /* "XXXX XXXX" */
#define PCI_ADDR_LEN 13 /* "XXXX:XX:XX.X" */
#define SRIOV_FOUND 0
#define SRIOV_NOT_FOUND 1
#define SRIOV_ERROR -1
struct _pciDevice {
unsigned domain;
unsigned bus;
unsigned slot;
unsigned function;
char name[PCI_ADDR_LEN]; /* domain:bus:slot.function */
char id[PCI_ID_LEN]; /* product vendor */
char *path;
const char *used_by; /* The domain which uses the device */
int fd;
unsigned initted;
unsigned pcie_cap_pos;
unsigned pci_pm_cap_pos;
unsigned has_flr : 1;
unsigned has_pm_reset : 1;
unsigned managed : 1;
/* used by reattach function */
unsigned unbind_from_stub : 1;
unsigned remove_slot : 1;
unsigned reprobe : 1;
};
struct _pciDeviceList {
unsigned count;
pciDevice **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 */
/* 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 */
/* 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)
static int
pciOpenConfig(pciDevice *dev)
{
int fd;
if (dev->fd > 0)
return 0;
fd = open(dev->path, O_RDWR);
if (fd < 0) {
char ebuf[1024];
VIR_WARN("Failed to open config space file '%s': %s",
dev->path, virStrerror(errno, ebuf, sizeof(ebuf)));
return -1;
}
VIR_DEBUG("%s %s: opened %s", dev->id, dev->name, dev->path);
dev->fd = fd;
return 0;
}
static void
pciCloseConfig(pciDevice *dev)
{
if (!dev)
return;
VIR_FORCE_CLOSE(dev->fd);
}
static int
pciRead(pciDevice *dev, unsigned pos, uint8_t *buf, unsigned buflen)
{
memset(buf, 0, buflen);
if (pciOpenConfig(dev) < 0)
return -1;
if (lseek(dev->fd, pos, SEEK_SET) != pos ||
saferead(dev->fd, buf, buflen) != buflen) {
char ebuf[1024];
VIR_WARN("Failed to read from '%s' : %s", dev->path,
virStrerror(errno, ebuf, sizeof(ebuf)));
return -1;
}
return 0;
}
static uint8_t
pciRead8(pciDevice *dev, unsigned pos)
{
uint8_t buf;
pciRead(dev, pos, &buf, sizeof(buf));
return buf;
}
static uint16_t
pciRead16(pciDevice *dev, unsigned pos)
{
uint8_t buf[2];
pciRead(dev, pos, &buf[0], sizeof(buf));
return (buf[0] << 0) | (buf[1] << 8);
}
static uint32_t
pciRead32(pciDevice *dev, unsigned pos)
{
uint8_t buf[4];
pciRead(dev, pos, &buf[0], sizeof(buf));
return (buf[0] << 0) | (buf[1] << 8) | (buf[2] << 16) | (buf[3] << 24);
}
static int
pciWrite(pciDevice *dev, unsigned pos, uint8_t *buf, unsigned buflen)
{
if (pciOpenConfig(dev) < 0)
return -1;
if (lseek(dev->fd, pos, SEEK_SET) != pos ||
safewrite(dev->fd, buf, buflen) != buflen) {
char ebuf[1024];
VIR_WARN("Failed to write to '%s' : %s", dev->path,
virStrerror(errno, ebuf, sizeof(ebuf)));
return -1;
}
return 0;
}
static void
pciWrite16(pciDevice *dev, unsigned pos, uint16_t val)
{
uint8_t buf[2] = { (val >> 0), (val >> 8) };
pciWrite(dev, pos, &buf[0], sizeof(buf));
}
static void
pciWrite32(pciDevice *dev, unsigned pos, uint32_t val)
{
uint8_t buf[4] = { (val >> 0), (val >> 8), (val >> 16), (val >> 14) };
pciWrite(dev, pos, &buf[0], sizeof(buf));
}
typedef int (*pciIterPredicate)(pciDevice *, pciDevice *, 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
pciIterDevices(pciIterPredicate predicate,
pciDevice *dev,
pciDevice **matched,
void *data)
{
DIR *dir;
struct dirent *entry;
int ret = 0;
int rc;
*matched = NULL;
VIR_DEBUG("%s %s: iterating over " PCI_SYSFS "devices", dev->id, dev->name);
dir = opendir(PCI_SYSFS "devices");
if (!dir) {
VIR_WARN("Failed to open " PCI_SYSFS "devices");
return -1;
}
while ((entry = readdir(dir))) {
unsigned int domain, bus, slot, function;
pciDevice *check;
char *tmp;
/* Ignore '.' and '..' */
if (entry->d_name[0] == '.')
continue;
/* 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 = pciGetDevice(domain, bus, slot, function);
if (!check) {
ret = -1;
break;
}
rc = predicate(dev, check, data);
if (rc < 0) {
/* the predicate returned an error, bail */
pciFreeDevice(check);
ret = -1;
break;
}
else if (rc == 1) {
VIR_DEBUG("%s %s: iter matched on %s", dev->id, dev->name, check->name);
*matched = check;
ret = 1;
break;
}
pciFreeDevice(check);
}
closedir(dir);
return ret;
}
static uint8_t
pciFindCapabilityOffset(pciDevice *dev, unsigned capability)
{
uint16_t status;
uint8_t pos;
status = pciRead16(dev, PCI_STATUS);
if (!(status & PCI_STATUS_CAP_LIST))
return 0;
pos = pciRead8(dev, PCI_CAPABILITY_LIST);
/* 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 = pciRead8(dev, pos);
if (capid == capability) {
VIR_DEBUG("%s %s: found cap 0x%.2x at 0x%.2x",
dev->id, dev->name, capability, pos);
return pos;
}
pos = pciRead8(dev, pos + 1);
}
VIR_DEBUG("%s %s: failed to find cap 0x%.2x", dev->id, dev->name, capability);
return 0;
}
static unsigned int
pciFindExtendedCapabilityOffset(pciDevice *dev, unsigned 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 = pciRead32(dev, 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 int
pciDetectFunctionLevelReset(pciDevice *dev)
{
uint32_t caps;
uint8_t pos;
char *path;
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 = pciRead32(dev, 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 1;
}
}
/* The PCI AF Function Level Reset capability is
* the same thing, except for conventional PCI
* devices. This is not common yet.
*/
pos = pciFindCapabilityOffset(dev, PCI_CAP_ID_AF);
if (pos) {
caps = pciRead16(dev, pos + PCI_AF_CAP);
if (caps & PCI_AF_CAP_FLR) {
VIR_DEBUG("%s %s: detected PCI FLR capability", dev->id, dev->name);
return 1;
}
}
/* 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
*/
if (virAsprintf(&path, PCI_SYSFS "devices/%s/physfn", dev->name) < 0) {
virReportOOMError();
return -1;
}
found = virFileExists(path);
VIR_FREE(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 1;
}
VIR_DEBUG("%s %s: no FLR capability found", dev->id, dev->name);
return 0;
}
/* 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 unsigned
pciDetectPowerManagementReset(pciDevice *dev)
{
if (dev->pci_pm_cap_pos) {
uint32_t ctl;
/* require the NO_SOFT_RESET bit is clear */
ctl = pciRead32(dev, 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 1;
}
}
VIR_DEBUG("%s %s: no PM reset capability found", dev->id, dev->name);
return 0;
}
/* Any active devices on the same domain/bus ? */
static int
pciSharesBusWithActive(pciDevice *dev, pciDevice *check, void *data)
{
pciDeviceList *inactiveDevs = data;
/* Different domain, different bus, or simply identical device */
if (dev->domain != check->domain ||
dev->bus != check->bus ||
(dev->slot == check->slot &&
dev->function == check->function))
return 0;
/* same bus, but inactive, i.e. about to be assigned to guest */
if (inactiveDevs && pciDeviceListFind(inactiveDevs, check))
return 0;
return 1;
}
static pciDevice *
pciBusContainsActiveDevices(pciDevice *dev,
pciDeviceList *inactiveDevs)
{
pciDevice *active = NULL;
if (pciIterDevices(pciSharesBusWithActive,
dev, &active, inactiveDevs) < 0)
return NULL;
return active;
}
/* Is @check the parent of @dev ? */
static int
pciIsParent(pciDevice *dev, pciDevice *check, void *data)
{
uint16_t device_class;
uint8_t header_type, secondary, subordinate;
pciDevice **best = data;
if (dev->domain != check->domain)
return 0;
/* Is it a bridge? */
device_class = pciRead16(check, PCI_CLASS_DEVICE);
if (device_class != PCI_CLASS_BRIDGE_PCI)
return 0;
/* Is it a plane? */
header_type = pciRead8(check, PCI_HEADER_TYPE);
if ((header_type & PCI_HEADER_TYPE_MASK) != PCI_HEADER_TYPE_BRIDGE)
return 0;
secondary = pciRead8(check, PCI_SECONDARY_BUS);
subordinate = pciRead8(check, 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->bus == secondary)
return 1;
/* otherwise, SRIOV allows VFs to be on different busses then 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->bus > secondary && dev->bus <= subordinate) {
if (*best == NULL) {
*best = pciGetDevice(check->domain, check->bus, check->slot,
check->function);
if (*best == NULL)
return -1;
}
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
*/
if (secondary > pciRead8(*best, PCI_SECONDARY_BUS)) {
pciFreeDevice(*best);
*best = pciGetDevice(check->domain, check->bus, check->slot,
check->function);
if (*best == NULL)
return -1;
}
}
}
return 0;
}
static int
pciGetParentDevice(pciDevice *dev, pciDevice **parent)
{
pciDevice *best = NULL;
int ret;
*parent = NULL;
ret = pciIterDevices(pciIsParent, dev, parent, &best);
if (ret == 1)
pciFreeDevice(best);
else if (ret == 0)
*parent = best;
return ret;
}
/* Secondary Bus Reset is our sledgehammer - it resets all
* devices behind a bus.
*/
static int
pciTrySecondaryBusReset(pciDevice *dev,
pciDeviceList *inactiveDevs)
{
pciDevice *parent, *conflict;
uint8_t config_space[PCI_CONF_LEN];
uint16_t ctl;
int ret = -1;
/* For now, we just refuse to do a secondary bus reset
* if there are other devices/functions behind the bus.
* In future, we could allow it so long as those devices
* are not in use by the host or other guests.
*/
if ((conflict = pciBusContainsActiveDevices(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 (pciGetParentDevice(dev, &parent) < 0)
return -1;
if (!parent) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("Failed to find parent device for %s"),
dev->name);
return -1;
}
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 (pciRead(dev, 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 = pciRead16(dev, PCI_BRIDGE_CONTROL);
pciWrite16(parent, PCI_BRIDGE_CONTROL, ctl | PCI_BRIDGE_CTL_RESET);
usleep(200 * 1000); /* sleep 200ms */
pciWrite16(parent, PCI_BRIDGE_CONTROL, ctl);
usleep(200 * 1000); /* sleep 200ms */
if (pciWrite(dev, 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:
pciFreeDevice(parent);
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
pciTryPowerManagementReset(pciDevice *dev)
{
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 (pciRead(dev, 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 = pciRead32(dev, dev->pci_pm_cap_pos + PCI_PM_CTRL);
ctl &= ~PCI_PM_CTRL_STATE_MASK;
pciWrite32(dev, dev->pci_pm_cap_pos + PCI_PM_CTRL, ctl|PCI_PM_CTRL_STATE_D3hot);
usleep(10 * 1000); /* sleep 10ms */
pciWrite32(dev, dev->pci_pm_cap_pos + PCI_PM_CTRL, ctl|PCI_PM_CTRL_STATE_D0);
usleep(10 * 1000); /* sleep 10ms */
if (pciWrite(dev, 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;
}
static int
pciInitDevice(pciDevice *dev)
{
int flr;
if (pciOpenConfig(dev) < 0) {
virReportSystemError(errno,
_("Failed to open config space file '%s'"),
dev->path);
return -1;
}
dev->pcie_cap_pos = pciFindCapabilityOffset(dev, PCI_CAP_ID_EXP);
dev->pci_pm_cap_pos = pciFindCapabilityOffset(dev, PCI_CAP_ID_PM);
flr = pciDetectFunctionLevelReset(dev);
if (flr < 0)
return flr;
dev->has_flr = flr;
dev->has_pm_reset = pciDetectPowerManagementReset(dev);
dev->initted = 1;
return 0;
}
int
pciResetDevice(pciDevice *dev,
pciDeviceList *activeDevs,
pciDeviceList *inactiveDevs)
{
int ret = -1;
if (activeDevs && pciDeviceListFind(activeDevs, dev)) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("Not resetting active device %s"), dev->name);
return -1;
}
if (!dev->initted && pciInitDevice(dev) < 0)
return -1;
/* 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)
return 0;
/* 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 = pciTryPowerManagementReset(dev);
/* Bus reset is not an option with the root bus */
if (ret < 0 && dev->bus != 0)
ret = pciTrySecondaryBusReset(dev, 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"));
}
return ret;
}
static int
pciDriverDir(char **buffer, const char *driver)
{
VIR_FREE(*buffer);
if (virAsprintf(buffer, PCI_SYSFS "drivers/%s", driver) < 0) {
virReportOOMError();
return -1;
}
return 0;
}
static int
pciDriverFile(char **buffer, const char *driver, const char *file)
{
VIR_FREE(*buffer);
if (virAsprintf(buffer, PCI_SYSFS "drivers/%s/%s", driver, file) < 0) {
virReportOOMError();
return -1;
}
return 0;
}
static int
pciDeviceFile(char **buffer, const char *device, const char *file)
{
VIR_FREE(*buffer);
if (virAsprintf(buffer, PCI_SYSFS "devices/%s/%s", device, file) < 0) {
virReportOOMError();
return -1;
}
return 0;
}
static const char *
pciFindStubDriver(void)
{
char *drvpath = NULL;
int probed = 0;
recheck:
if (pciDriverDir(&drvpath, "pci-stub") < 0) {
return NULL;
}
if (virFileExists(drvpath)) {
VIR_FREE(drvpath);
return "pci-stub";
}
if (pciDriverDir(&drvpath, "pciback") < 0) {
return NULL;
}
if (virFileExists(drvpath)) {
VIR_FREE(drvpath);
return "pciback";
}
VIR_FREE(drvpath);
if (!probed) {
const char *const stubprobe[] = { MODPROBE, "pci-stub", NULL };
const char *const backprobe[] = { MODPROBE, "pciback", NULL };
probed = 1;
/*
* Probing for pci-stub will succeed regardless of whether
* on native or Xen kernels.
* On Xen though, we want to prefer pciback, so probe
* for that first, because that will only work on Xen
*/
if (virRun(backprobe, NULL) < 0 &&
virRun(stubprobe, NULL) < 0) {
char ebuf[1024];
VIR_WARN("failed to load pci-stub or pciback drivers: %s",
virStrerror(errno, ebuf, sizeof(ebuf)));
return NULL;
}
goto recheck;
}
return NULL;
}
static int
pciUnbindDeviceFromStub(pciDevice *dev, const char *driver)
{
int result = -1;
char *drvdir = NULL;
char *path = NULL;
if (pciDriverDir(&drvdir, driver) < 0)
goto cleanup;
if (!dev->unbind_from_stub)
goto remove_slot;
/* If the device is bound to stub, unbind it.
*/
if (pciDeviceFile(&path, dev->name, "driver") < 0)
goto cleanup;
if (virFileExists(drvdir) && virFileLinkPointsTo(path, drvdir)) {
if (pciDriverFile(&path, driver, "unbind") < 0) {
goto cleanup;
}
if (virFileWriteStr(path, dev->name, 0) < 0) {
virReportSystemError(errno,
_("Failed to unbind PCI device '%s' from %s"),
dev->name, driver);
goto cleanup;
}
}
dev->unbind_from_stub = 0;
remove_slot:
if (!dev->remove_slot)
goto reprobe;
/* Xen's pciback.ko wants you to use remove_slot on the specific device */
if (pciDriverFile(&path, driver, "remove_slot") < 0) {
goto cleanup;
}
if (virFileExists(path) && virFileWriteStr(path, dev->name, 0) < 0) {
virReportSystemError(errno,
_("Failed to remove slot for PCI device '%s' from %s"),
dev->name, driver);
goto cleanup;
}
dev->remove_slot = 0;
reprobe:
if (!dev->reprobe) {
result = 0;
goto cleanup;
}
/* Trigger a re-probe of the device is not in the stub's dynamic
* ID table. If the stub is available, but 'remove_id' isn't
* available, then re-probing would just cause the device to be
* re-bound to the stub.
*/
if (pciDriverFile(&path, driver, "remove_id") < 0) {
goto cleanup;
}
if (!virFileExists(drvdir) || virFileExists(path)) {
if (virFileWriteStr(PCI_SYSFS "drivers_probe", dev->name, 0) < 0) {
virReportSystemError(errno,
_("Failed to trigger a re-probe for PCI device '%s'"),
dev->name);
goto cleanup;
}
}
result = 0;
cleanup:
/* do not do it again */
dev->unbind_from_stub = 0;
dev->remove_slot = 0;
dev->reprobe = 0;
VIR_FREE(drvdir);
VIR_FREE(path);
return result;
}
static int
pciBindDeviceToStub(pciDevice *dev, const char *driver)
{
int result = -1;
char *drvdir = NULL;
char *path = NULL;
int reprobe = 0;
/* check whether the device is already bound to a driver */
if (pciDriverDir(&drvdir, driver) < 0 ||
pciDeviceFile(&path, dev->name, "driver") < 0) {
goto cleanup;
}
if (virFileExists(path)) {
if (virFileLinkPointsTo(path, drvdir)) {
/* The device is already bound to pci-stub */
result = 0;
goto cleanup;
}
reprobe = 1;
}
/* Add the PCI device ID to the stub's dynamic ID table;
* this is needed to allow us to bind the device to the stub.
* Note: if the device is not currently bound to any driver,
* stub will immediately be bound to the device. Also, note
* that if a new device with this ID is hotplugged, or if a probe
* is triggered for such a device, it will also be immediately
* bound by the stub.
*/
if (pciDriverFile(&path, driver, "new_id") < 0) {
goto cleanup;
}
if (virFileWriteStr(path, dev->id, 0) < 0) {
virReportSystemError(errno,
_("Failed to add PCI device ID '%s' to %s"),
dev->id, driver);
goto cleanup;
}
/* check whether the device is bound to pci-stub when we write dev->id to
* new_id.
*/
if (pciDriverDir(&drvdir, driver) < 0 ||
pciDeviceFile(&path, dev->name, "driver") < 0) {
goto remove_id;
}
if (virFileLinkPointsTo(path, drvdir)) {
dev->unbind_from_stub = 1;
dev->remove_slot = 1;
goto remove_id;
}
/* If the device is already bound to a driver, unbind it.
* Note, this will have rather unpleasant side effects if this
* PCI device happens to be IDE controller for the disk hosting
* your root filesystem.
*/
if (pciDeviceFile(&path, dev->name, "driver/unbind") < 0) {
goto cleanup;
}
if (virFileExists(path)) {
if (virFileWriteStr(path, dev->name, 0) < 0) {
virReportSystemError(errno,
_("Failed to unbind PCI device '%s'"),
dev->name);
goto cleanup;
}
dev->reprobe = reprobe;
}
/* If the device isn't already bound to pci-stub, try binding it now.
*/
if (pciDriverDir(&drvdir, driver) < 0 ||
pciDeviceFile(&path, dev->name, "driver") < 0) {
goto remove_id;
}
if (!virFileLinkPointsTo(path, drvdir)) {
/* Xen's pciback.ko wants you to use new_slot first */
if (pciDriverFile(&path, driver, "new_slot") < 0) {
goto remove_id;
}
if (virFileExists(path) && virFileWriteStr(path, dev->name, 0) < 0) {
virReportSystemError(errno,
_("Failed to add slot for PCI device '%s' to %s"),
dev->name, driver);
goto remove_id;
}
dev->remove_slot = 1;
if (pciDriverFile(&path, driver, "bind") < 0) {
goto remove_id;
}
if (virFileWriteStr(path, dev->name, 0) < 0) {
virReportSystemError(errno,
_("Failed to bind PCI device '%s' to %s"),
dev->name, driver);
goto remove_id;
}
dev->unbind_from_stub = 1;
}
remove_id:
/* If 'remove_id' exists, remove the device id from pci-stub's dynamic
* ID table so that 'drivers_probe' works below.
*/
if (pciDriverFile(&path, driver, "remove_id") < 0) {
/* We do not remove PCI ID from pci-stub, and we cannot reprobe it */
if (dev->reprobe) {
VIR_WARN("Could not remove PCI ID '%s' from %s, and the device "
"cannot be probed again.", dev->id, driver);
}
dev->reprobe = 0;
goto cleanup;
}
if (virFileExists(path) && virFileWriteStr(path, dev->id, 0) < 0) {
virReportSystemError(errno,
_("Failed to remove PCI ID '%s' from %s"),
dev->id, driver);
/* remove PCI ID from pci-stub failed, and we cannot reprobe it */
if (dev->reprobe) {
VIR_WARN("Failed to remove PCI ID '%s' from %s, and the device "
"cannot be probed again.", dev->id, driver);
}
dev->reprobe = 0;
goto cleanup;
}
result = 0;
cleanup:
VIR_FREE(drvdir);
VIR_FREE(path);
if (result < 0) {
pciUnbindDeviceFromStub(dev, driver);
}
return result;
}
int
pciDettachDevice(pciDevice *dev,
pciDeviceList *activeDevs,
pciDeviceList *inactiveDevs)
{
const char *driver = pciFindStubDriver();
if (!driver) {
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("cannot find any PCI stub module"));
return -1;
}
if (activeDevs && pciDeviceListFind(activeDevs, dev)) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("Not detaching active device %s"), dev->name);
return -1;
}
if (pciBindDeviceToStub(dev, driver) < 0)
return -1;
/* Add the dev into list inactiveDevs */
if (inactiveDevs && !pciDeviceListFind(inactiveDevs, dev)) {
if (pciDeviceListAdd(inactiveDevs, dev) < 0)
return -1;
}
return 0;
}
int
pciReAttachDevice(pciDevice *dev,
pciDeviceList *activeDevs,
pciDeviceList *inactiveDevs)
{
const char *driver = pciFindStubDriver();
if (!driver) {
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("cannot find any PCI stub module"));
return -1;
}
if (activeDevs && pciDeviceListFind(activeDevs, dev)) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("Not reattaching active device %s"), dev->name);
return -1;
}
if (pciUnbindDeviceFromStub(dev, driver) < 0)
return -1;
/* Steal the dev from list inactiveDevs */
if (inactiveDevs)
pciDeviceListSteal(inactiveDevs, dev);
return 0;
}
/* Certain hypervisors (like qemu/kvm) map the PCI bar(s) on
* the host when doing device passthrough. This can lead to a race
* condition where the hypervisor is still cleaning up the device while
* libvirt is trying to re-attach it to the host device driver. To avoid
* this situation, we look through /proc/iomem, and if the hypervisor is
* still holding onto the bar (denoted by the string in the matcher variable),
* then we can wait around a bit for that to clear up.
*
* A typical /proc/iomem looks like this (snipped for brevity):
* 00010000-0008efff : System RAM
* 0008f000-0008ffff : reserved
* ...
* 00100000-cc9fcfff : System RAM
* 00200000-00483d3b : Kernel code
* 00483d3c-005c88df : Kernel data
* cc9fd000-ccc71fff : ACPI Non-volatile Storage
* ...
* d0200000-d02fffff : PCI Bus #05
* d0200000-d021ffff : 0000:05:00.0
* d0200000-d021ffff : e1000e
* d0220000-d023ffff : 0000:05:00.0
* d0220000-d023ffff : e1000e
* ...
* f0000000-f0003fff : 0000:00:1b.0
* f0000000-f0003fff : kvm_assigned_device
*
* Returns 0 if we are clear to continue, and 1 if the hypervisor is still
* holding onto the resource.
*/
int
pciWaitForDeviceCleanup(pciDevice *dev, const char *matcher)
{
FILE *fp;
char line[160];
char *tmp;
unsigned long long start, end;
unsigned int domain, bus, slot, function;
int in_matching_device;
int ret;
size_t match_depth;
fp = fopen("/proc/iomem", "r");
if (!fp) {
/* If we failed to open iomem, we just basically ignore the error. The
* unbind might succeed anyway, and besides, it's very likely we have
* no way to report the error
*/
VIR_DEBUG("Failed to open /proc/iomem, trying to continue anyway");
return 0;
}
ret = 0;
in_matching_device = 0;
match_depth = 0;
while (fgets(line, sizeof(line), fp) != 0) {
/* the logic here is a bit confusing. For each line, we look to
* see if it matches the domain:bus:slot.function we were given.
* If this line matches the DBSF, then any subsequent lines indented
* by 2 spaces are the PCI regions for this device. It's also
* possible that none of the PCI regions are currently mapped, in
* which case we have no indented regions. This code handles all
* of these situations
*/
if (in_matching_device && (strspn(line, " ") == (match_depth + 2))) {
/* expected format: <start>-<end> : <suffix> */
if (/* start */
virStrToLong_ull(line, &tmp, 16, &start) < 0 || *tmp != '-' ||
/* end */
virStrToLong_ull(tmp + 1, &tmp, 16, &end) < 0 ||
(tmp = STRSKIP(tmp, " : ")) == NULL)
continue;
if (STRPREFIX(tmp, matcher)) {
ret = 1;
break;
}
}
else {
in_matching_device = 0;
/* expected format: <start>-<end> : <domain>:<bus>:<slot>.<function> */
if (/* start */
virStrToLong_ull(line, &tmp, 16, &start) < 0 || *tmp != '-' ||
/* end */
virStrToLong_ull(tmp + 1, &tmp, 16, &end) < 0 ||
(tmp = STRSKIP(tmp, " : ")) == NULL ||
/* domain */
virStrToLong_ui(tmp, &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, &tmp, 16, &function) < 0 || *tmp != '\n')
continue;
if (domain != dev->domain || bus != dev->bus || slot != dev->slot ||
function != dev->function)
continue;
in_matching_device = 1;
match_depth = strspn(line, " ");
}
}
VIR_FORCE_FCLOSE(fp);
return ret;
}
static char *
pciReadDeviceID(pciDevice *dev, const char *id_name)
{
char *path = NULL;
char *id_str;
if (pciDeviceFile(&path, dev->name, id_name) < 0) {
return NULL;
}
/* ID string is '0xNNNN\n' ... i.e. 7 bytes */
if (virFileReadAll(path, 7, &id_str) < 0) {
VIR_FREE(path);
return NULL;
}
VIR_FREE(path);
/* Check for 0x suffix */
if (id_str[0] != '0' || id_str[1] != 'x') {
VIR_FREE(id_str);
return NULL;
}
/* Chop off the newline; we know the string is 7 bytes */
id_str[6] = '\0';
return id_str;
}
int
pciGetDeviceAddrString(unsigned domain,
unsigned bus,
unsigned slot,
unsigned function,
char **pciConfigAddr)
{
pciDevice *dev = NULL;
int ret = -1;
dev = pciGetDevice(domain, bus, slot, function);
if (dev != NULL) {
if ((*pciConfigAddr = strdup(dev->name)) == NULL) {
virReportOOMError();
goto cleanup;
}
ret = 0;
}
cleanup:
pciFreeDevice(dev);
return ret;
}
pciDevice *
pciGetDevice(unsigned domain,
unsigned bus,
unsigned slot,
unsigned function)
{
pciDevice *dev;
char *vendor = NULL;
char *product = NULL;
if (VIR_ALLOC(dev) < 0) {
virReportOOMError();
return NULL;
}
dev->fd = -1;
dev->domain = domain;
dev->bus = bus;
dev->slot = slot;
dev->function = function;
if (snprintf(dev->name, sizeof(dev->name), "%.4x:%.2x:%.2x.%.1x",
dev->domain, dev->bus, dev->slot,
dev->function) >= sizeof(dev->name)) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("dev->name buffer overflow: %.4x:%.2x:%.2x.%.1x"),
dev->domain, dev->bus, dev->slot, dev->function);
goto error;
}
if (virAsprintf(&dev->path, PCI_SYSFS "devices/%s/config",
dev->name) < 0) {
virReportOOMError();
goto error;
}
if (access(dev->path, F_OK) != 0) {
virReportSystemError(errno,
_("Device %s not found: could not access %s"),
dev->name, dev->path);
goto error;
}
vendor = pciReadDeviceID(dev, "vendor");
product = pciReadDeviceID(dev, "device");
if (!vendor || !product) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("Failed to read product/vendor ID for %s"),
dev->name);
goto error;
}
/* strings contain '0x' prefix */
if (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]);
goto error;
}
VIR_DEBUG("%s %s: initialized", dev->id, dev->name);
cleanup:
VIR_FREE(product);
VIR_FREE(vendor);
return dev;
error:
pciFreeDevice(dev);
dev = NULL;
goto cleanup;
}
void
pciFreeDevice(pciDevice *dev)
{
if (!dev)
return;
VIR_DEBUG("%s %s: freeing", dev->id, dev->name);
pciCloseConfig(dev);
VIR_FREE(dev->path);
VIR_FREE(dev);
}
const char *
pciDeviceGetName(pciDevice *dev)
{
return dev->name;
}
void pciDeviceSetManaged(pciDevice *dev, unsigned managed)
{
dev->managed = !!managed;
}
unsigned pciDeviceGetManaged(pciDevice *dev)
{
return dev->managed;
}
unsigned
pciDeviceGetUnbindFromStub(pciDevice *dev)
{
return dev->unbind_from_stub;
}
void
pciDeviceSetUnbindFromStub(pciDevice *dev, unsigned unbind)
{
dev->unbind_from_stub = !!unbind;
}
unsigned
pciDeviceGetRemoveSlot(pciDevice *dev)
{
return dev->remove_slot;
}
void
pciDeviceSetRemoveSlot(pciDevice *dev, unsigned remove_slot)
{
dev->remove_slot = !!remove_slot;
}
unsigned
pciDeviceGetReprobe(pciDevice *dev)
{
return dev->reprobe;
}
void
pciDeviceSetReprobe(pciDevice *dev, unsigned reprobe)
{
dev->reprobe = !!reprobe;
}
void
pciDeviceSetUsedBy(pciDevice *dev, const char *name)
{
dev->used_by = name;
}
const char *
pciDeviceGetUsedBy(pciDevice *dev)
{
return dev->used_by;
}
void pciDeviceReAttachInit(pciDevice *pci)
{
pci->unbind_from_stub = 1;
pci->remove_slot = 1;
pci->reprobe = 1;
}
pciDeviceList *
pciDeviceListNew(void)
{
pciDeviceList *list;
if (VIR_ALLOC(list) < 0) {
virReportOOMError();
return NULL;
}
return list;
}
void
pciDeviceListFree(pciDeviceList *list)
{
int i;
if (!list)
return;
for (i = 0; i < list->count; i++) {
pciFreeDevice(list->devs[i]);
list->devs[i] = NULL;
}
list->count = 0;
VIR_FREE(list->devs);
VIR_FREE(list);
}
int
pciDeviceListAdd(pciDeviceList *list,
pciDevice *dev)
{
if (pciDeviceListFind(list, dev)) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("Device %s is already in use"), dev->name);
return -1;
}
if (VIR_REALLOC_N(list->devs, list->count+1) < 0) {
virReportOOMError();
return -1;
}
list->devs[list->count++] = dev;
return 0;
}
pciDevice *
pciDeviceListGet(pciDeviceList *list,
int idx)
{
if (idx >= list->count)
return NULL;
if (idx < 0)
return NULL;
return list->devs[idx];
}
int
pciDeviceListCount(pciDeviceList *list)
{
return list->count;
}
pciDevice *
pciDeviceListSteal(pciDeviceList *list,
pciDevice *dev)
{
pciDevice *ret = NULL;
int i;
for (i = 0; i < list->count; i++) {
if (list->devs[i]->domain != dev->domain ||
list->devs[i]->bus != dev->bus ||
list->devs[i]->slot != dev->slot ||
list->devs[i]->function != dev->function)
continue;
ret = list->devs[i];
if (i != --list->count)
memmove(&list->devs[i],
&list->devs[i+1],
sizeof(*list->devs) * (list->count-i));
if (VIR_REALLOC_N(list->devs, list->count) < 0) {
; /* not fatal */
}
break;
}
return ret;
}
void
pciDeviceListDel(pciDeviceList *list,
pciDevice *dev)
{
pciDevice *ret = pciDeviceListSteal(list, dev);
if (ret)
pciFreeDevice(ret);
}
pciDevice *
pciDeviceListFind(pciDeviceList *list, pciDevice *dev)
{
int i;
for (i = 0; i < list->count; i++)
if (list->devs[i]->domain == dev->domain &&
list->devs[i]->bus == dev->bus &&
list->devs[i]->slot == dev->slot &&
list->devs[i]->function == dev->function)
return list->devs[i];
return NULL;
}
int pciDeviceFileIterate(pciDevice *dev,
pciDeviceFileActor actor,
void *opaque)
{
char *pcidir = NULL;
char *file = NULL;
DIR *dir = NULL;
int ret = -1;
struct dirent *ent;
if (virAsprintf(&pcidir, "/sys/bus/pci/devices/%04x:%02x:%02x.%x",
dev->domain, dev->bus, dev->slot, dev->function) < 0) {
virReportOOMError();
goto cleanup;
}
if (!(dir = opendir(pcidir))) {
virReportSystemError(errno,
_("cannot open %s"), pcidir);
goto cleanup;
}
while ((ent = readdir(dir)) != NULL) {
/* Device assignment requires:
* $PCIDIR/config, $PCIDIR/resource, $PCIDIR/resourceNNN,
* $PCIDIR/rom, $PCIDIR/reset
*/
if (STREQ(ent->d_name, "config") ||
STRPREFIX(ent->d_name, "resource") ||
STREQ(ent->d_name, "rom") ||
STREQ(ent->d_name, "reset")) {
if (virAsprintf(&file, "%s/%s", pcidir, ent->d_name) < 0) {
virReportOOMError();
goto cleanup;
}
if ((actor)(dev, file, opaque) < 0)
goto cleanup;
VIR_FREE(file);
}
}
ret = 0;
cleanup:
if (dir)
closedir(dir);
VIR_FREE(file);
VIR_FREE(pcidir);
return ret;
}
static int
pciDeviceDownstreamLacksACS(pciDevice *dev)
{
uint16_t flags;
uint16_t ctrl;
unsigned int pos;
if (!dev->initted && pciInitDevice(dev) < 0)
return -1;
pos = dev->pcie_cap_pos;
if (!pos || pciRead16(dev, PCI_CLASS_DEVICE) != PCI_CLASS_BRIDGE_PCI)
return 0;
flags = pciRead16(dev, pos + PCI_EXP_FLAGS);
if (((flags & PCI_EXP_FLAGS_TYPE) >> 4) != PCI_EXP_TYPE_DOWNSTREAM)
return 0;
pos = pciFindExtendedCapabilityOffset(dev, PCI_EXT_CAP_ID_ACS);
if (!pos) {
VIR_DEBUG("%s %s: downstream port lacks ACS", dev->id, dev->name);
return 1;
}
ctrl = pciRead16(dev, 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);
return 1;
}
return 0;
}
static int
pciDeviceIsBehindSwitchLackingACS(pciDevice *dev)
{
pciDevice *parent;
if (pciGetParentDevice(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->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 {
pciDevice *tmp;
int acs;
int ret;
acs = pciDeviceDownstreamLacksACS(parent);
if (acs) {
pciFreeDevice(parent);
if (acs < 0)
return -1;
else
return 1;
}
tmp = parent;
ret = pciGetParentDevice(parent, &parent);
pciFreeDevice(tmp);
if (ret < 0)
return -1;
} while (parent);
return 0;
}
int pciDeviceIsAssignable(pciDevice *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 = pciDeviceIsBehindSwitchLackingACS(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;
}
#ifdef __linux__
/*
* returns true if equal
*/
static bool
pciConfigAddressEqual(struct pci_config_address *bdf1,
struct pci_config_address *bdf2)
{
return ((bdf1->domain == bdf2->domain) &&
(bdf1->bus == bdf2->bus) &&
(bdf1->slot == bdf2->slot) &&
(bdf1->function == bdf2->function));
}
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);
} else {
VIR_DEBUG("Converted '%s' to unsigned int %u", s, *result);
}
return ret;
}
static int
pciParsePciConfigAddress(char *address,
struct pci_config_address *bdf)
{
char *p = NULL;
int ret = -1;
if ((address == NULL) || (logStrToLong_ui(address, &p, 16,
&bdf->domain) == -1)) {
goto out;
}
if ((p == NULL) || (logStrToLong_ui(p+1, &p, 16,
&bdf->bus) == -1)) {
goto out;
}
if ((p == NULL) || (logStrToLong_ui(p+1, &p, 16,
&bdf->slot) == -1)) {
goto out;
}
if ((p == NULL) || (logStrToLong_ui(p+1, &p, 16,
&bdf->function) == -1)) {
goto out;
}
ret = 0;
out:
return ret;
}
static int
pciGetPciConfigAddressFromSysfsDeviceLink(const char *device_link,
struct pci_config_address **bdf)
{
char *config_address = NULL;
char *device_path = NULL;
char errbuf[64];
int ret = -1;
VIR_DEBUG("Attempting to resolve device path from device link '%s'",
device_link);
if (!virFileExists(device_link)) {
VIR_DEBUG("sysfs_path '%s' does not exist", device_link);
return ret;
}
device_path = canonicalize_file_name (device_link);
if (device_path == NULL) {
memset(errbuf, '\0', sizeof(errbuf));
virReportError(VIR_ERR_INTERNAL_ERROR,
_("Failed to resolve device link '%s': '%s'"),
device_link, virStrerror(errno, errbuf,
sizeof(errbuf)));
return ret;
}
config_address = basename(device_path);
if (VIR_ALLOC(*bdf) != 0) {
virReportOOMError();
goto out;
}
if (pciParsePciConfigAddress(config_address, *bdf) != 0) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("Failed to parse PCI config address '%s'"),
config_address);
VIR_FREE(*bdf);
goto out;
}
VIR_DEBUG("pci_config_address %.4x:%.2x:%.2x.%.1x",
(*bdf)->domain,
(*bdf)->bus,
(*bdf)->slot,
(*bdf)->function);
ret = 0;
out:
VIR_FREE(device_path);
return ret;
}
/*
* Returns Physical function given a virtual function
*/
int
pciGetPhysicalFunction(const char *vf_sysfs_path,
struct pci_config_address **physical_function)
{
int ret = -1;
char *device_link = NULL;
VIR_DEBUG("Attempting to get SR IOV physical function for device "
"with sysfs path '%s'", vf_sysfs_path);
if (virBuildPath(&device_link, vf_sysfs_path, "physfn") == -1) {
virReportOOMError();
return ret;
} else {
ret = pciGetPciConfigAddressFromSysfsDeviceLink(device_link,
physical_function);
}
VIR_FREE(device_link);
return ret;
}
/*
* Returns virtual functions of a physical function
*/
int
pciGetVirtualFunctions(const char *sysfs_path,
struct pci_config_address ***virtual_functions,
unsigned int *num_virtual_functions)
{
int ret = -1;
DIR *dir = NULL;
struct dirent *entry = NULL;
char *device_link = NULL;
char errbuf[64];
VIR_DEBUG("Attempting to get SR IOV virtual functions for device"
"with sysfs path '%s'", sysfs_path);
dir = opendir(sysfs_path);
if (dir == NULL) {
memset(errbuf, '\0', sizeof(errbuf));
virReportError(VIR_ERR_INTERNAL_ERROR,
_("Failed to open dir '%s': '%s'"),
sysfs_path, virStrerror(errno, errbuf,
sizeof(errbuf)));
return ret;
}
*virtual_functions = NULL;
*num_virtual_functions = 0;
while ((entry = readdir(dir))) {
if (STRPREFIX(entry->d_name, "virtfn")) {
if (virBuildPath(&device_link, sysfs_path, entry->d_name) == -1) {
virReportOOMError();
goto out;
}
VIR_DEBUG("Number of virtual functions: %d",
*num_virtual_functions);
if (VIR_REALLOC_N(*virtual_functions,
(*num_virtual_functions) + 1) != 0) {
virReportOOMError();
VIR_FREE(device_link);
goto out;
}
if (pciGetPciConfigAddressFromSysfsDeviceLink(device_link,
&((*virtual_functions)[*num_virtual_functions])) !=
SRIOV_FOUND) {
/* We should not get back SRIOV_NOT_FOUND in this
* case, so if we do, it's an error. */
virReportError(VIR_ERR_INTERNAL_ERROR,
_("Failed to get SR IOV function from device "
"link '%s'"), device_link);
VIR_FREE(device_link);
goto out;
} else {
(*num_virtual_functions)++;
}
VIR_FREE(device_link);
}
}
ret = 0;
out:
if (dir)
closedir(dir);
return ret;
}
/*
* Returns 1 if vf device is a virtual function, 0 if not, -1 on error
*/
int
pciDeviceIsVirtualFunction(const char *vf_sysfs_device_link)
{
char *vf_sysfs_physfn_link = NULL;
int ret = -1;
if (virAsprintf(&vf_sysfs_physfn_link, "%s/physfn",
vf_sysfs_device_link) < 0) {
virReportOOMError();
return ret;
}
ret = virFileExists(vf_sysfs_physfn_link);
VIR_FREE(vf_sysfs_physfn_link);
return ret;
}
/*
* Returns the sriov virtual function index of vf given its pf
*/
int
pciGetVirtualFunctionIndex(const char *pf_sysfs_device_link,
const char *vf_sysfs_device_link,
int *vf_index)
{
int ret = -1, i;
unsigned int num_virt_fns = 0;
struct pci_config_address *vf_bdf = NULL;
struct pci_config_address **virt_fns = NULL;
if (pciGetPciConfigAddressFromSysfsDeviceLink(vf_sysfs_device_link,
&vf_bdf) < 0)
return ret;
if (pciGetVirtualFunctions(pf_sysfs_device_link, &virt_fns,
&num_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 (pciConfigAddressEqual(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);
VIR_FREE(vf_bdf);
return ret;
}
/*
* Returns a path to the PCI sysfs file given the BDF of the PCI function
*/
int
pciSysfsFile(char *pciDeviceName, char **pci_sysfs_device_link)
{
if (virAsprintf(pci_sysfs_device_link, PCI_SYSFS "devices/%s",
pciDeviceName) < 0) {
virReportOOMError();
return -1;
}
return 0;
}
int
pciConfigAddressToSysfsFile(struct pci_config_address *dev,
char **pci_sysfs_device_link)
{
if (virAsprintf(pci_sysfs_device_link,
PCI_SYSFS "devices/%04x:%02x:%02x.%x", dev->domain,
dev->bus, dev->slot, dev->function) < 0) {
virReportOOMError();
return -1;
}
return 0;
}
/*
* Returns the network device name of a pci device
*/
int
pciDeviceNetName(char *device_link_sysfs_path, char **netname)
{
char *pcidev_sysfs_net_path = NULL;
int ret = -1;
DIR *dir = NULL;
struct dirent *entry = NULL;
if (virBuildPath(&pcidev_sysfs_net_path, device_link_sysfs_path,
"net") == -1) {
virReportOOMError();
return -1;
}
dir = opendir(pcidev_sysfs_net_path);
if (dir == NULL)
goto out;
while ((entry = readdir(dir))) {
if (STREQ(entry->d_name, ".") ||
STREQ(entry->d_name, ".."))
continue;
/* Assume a single directory entry */
*netname = strdup(entry->d_name);
if (!*netname)
virReportOOMError();
else
ret = 0;
break;
}
closedir(dir);
out:
VIR_FREE(pcidev_sysfs_net_path);
return ret;
}
int
pciDeviceGetVirtualFunctionInfo(const char *vf_sysfs_device_path,
char **pfname, int *vf_index)
{
struct pci_config_address *pf_config_address = NULL;
char *pf_sysfs_device_path = NULL;
int ret = -1;
if (pciGetPhysicalFunction(vf_sysfs_device_path, &pf_config_address) < 0)
return ret;
if (pciConfigAddressToSysfsFile(pf_config_address,
&pf_sysfs_device_path) < 0) {
VIR_FREE(pf_config_address);
return ret;
}
if (pciGetVirtualFunctionIndex(pf_sysfs_device_path, vf_sysfs_device_path,
vf_index) < 0)
goto cleanup;
ret = pciDeviceNetName(pf_sysfs_device_path, pfname);
cleanup:
VIR_FREE(pf_config_address);
VIR_FREE(pf_sysfs_device_path);
return ret;
}
#else
static const char *unsupported = N_("not supported on non-linux platforms");
int
pciGetPhysicalFunction(const char *vf_sysfs_path ATTRIBUTE_UNUSED,
struct pci_config_address **physical_function ATTRIBUTE_UNUSED)
{
virReportError(VIR_ERR_INTERNAL_ERROR, "%s", _(unsupported));
return -1;
}
int
pciGetVirtualFunctions(const char *sysfs_path ATTRIBUTE_UNUSED,
struct pci_config_address ***virtual_functions ATTRIBUTE_UNUSED,
unsigned int *num_virtual_functions ATTRIBUTE_UNUSED)
{
virReportError(VIR_ERR_INTERNAL_ERROR, "%s", _(unsupported));
return -1;
}
int
pciDeviceIsVirtualFunction(const char *vf_sysfs_device_link ATTRIBUTE_UNUSED)
{
virReportError(VIR_ERR_INTERNAL_ERROR, "%s", _(unsupported));
return -1;
}
int
pciGetVirtualFunctionIndex(const char *pf_sysfs_device_link ATTRIBUTE_UNUSED,
const char *vf_sysfs_device_link ATTRIBUTE_UNUSED,
int *vf_index ATTRIBUTE_UNUSED)
{
virReportError(VIR_ERR_INTERNAL_ERROR, "%s", _(unsupported));
return -1;
}
int
pciConfigAddressToSysfsFile(struct pci_config_address *dev ATTRIBUTE_UNUSED,
char **pci_sysfs_device_link ATTRIBUTE_UNUSED)
{
virReportError(VIR_ERR_INTERNAL_ERROR, "%s", _(unsupported));
return -1;
}
int
pciDeviceNetName(char *device_link_sysfs_path ATTRIBUTE_UNUSED,
char **netname ATTRIBUTE_UNUSED)
{
virReportError(VIR_ERR_INTERNAL_ERROR, "%s", _(unsupported));
return -1;
}
int
pciDeviceGetVirtualFunctionInfo(const char *vf_sysfs_device_path ATTRIBUTE_UNUSED,
char **pfname ATTRIBUTE_UNUSED,
int *vf_index ATTRIBUTE_UNUSED)
{
virReportError(VIR_ERR_INTERNAL_ERROR, "%s", _(unsupported));
return -1;
}
#endif /* __linux__ */
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