openkylin
/
qemu
mirror of https://gitee.com/openkylin/qemu.git
9
0
Fork 0
Code Issues Projects Releases Wiki Activity
qemu/hw/xen/xen-host-pci-device.c

403 lines
9.7 KiB
C
Raw Blame History

/*
* Copyright (C) 2011 Citrix Ltd.
*
* This work is licensed under the terms of the GNU GPL, version 2. See
* the COPYING file in the top-level directory.
*
*/
#include "qemu/osdep.h"
#include "qapi/error.h"
#include "qemu/cutils.h"
#include "xen-host-pci-device.h"
#define XEN_HOST_PCI_MAX_EXT_CAP \
((PCIE_CONFIG_SPACE_SIZE - PCI_CONFIG_SPACE_SIZE) / (PCI_CAP_SIZEOF + 4))
#ifdef XEN_HOST_PCI_DEVICE_DEBUG
# define XEN_HOST_PCI_LOG(f, a...) fprintf(stderr, "%s: " f, __func__, ##a)
#else
# define XEN_HOST_PCI_LOG(f, a...) (void)0
#endif
/*
* from linux/ioport.h
* IO resources have these defined flags.
*/
#define IORESOURCE_BITS 0x000000ff /* Bus-specific bits */
#define IORESOURCE_TYPE_BITS 0x00000f00 /* Resource type */
#define IORESOURCE_IO 0x00000100
#define IORESOURCE_MEM 0x00000200
#define IORESOURCE_PREFETCH 0x00001000 /* No side effects */
#define IORESOURCE_MEM_64 0x00100000
static void xen_host_pci_sysfs_path(const XenHostPCIDevice *d,
const char *name, char *buf, ssize_t size)
{
int rc;
rc = snprintf(buf, size, "/sys/bus/pci/devices/%04x:%02x:%02x.%d/%s",
d->domain, d->bus, d->dev, d->func, name);
assert(rc >= 0 && rc < size);
}
/* This size should be enough to read the first 7 lines of a resource file */
#define XEN_HOST_PCI_RESOURCE_BUFFER_SIZE 400
static void xen_host_pci_get_resource(XenHostPCIDevice *d, Error **errp)
{
int i, rc, fd;
char path[PATH_MAX];
char buf[XEN_HOST_PCI_RESOURCE_BUFFER_SIZE];
unsigned long long start, end, flags, size;
char *endptr, *s;
uint8_t type;
xen_host_pci_sysfs_path(d, "resource", path, sizeof(path));
fd = open(path, O_RDONLY);
if (fd == -1) {
error_setg_file_open(errp, errno, path);
return;
}
do {
rc = read(fd, &buf, sizeof(buf) - 1);
if (rc < 0 && errno != EINTR) {
error_setg_errno(errp, errno, "read err");
goto out;
}
} while (rc < 0);
buf[rc] = 0;
s = buf;
for (i = 0; i < PCI_NUM_REGIONS; i++) {
type = 0;
start = strtoll(s, &endptr, 16);
if (*endptr != ' ' || s == endptr) {
break;
}
s = endptr + 1;
end = strtoll(s, &endptr, 16);
if (*endptr != ' ' || s == endptr) {
break;
}
s = endptr + 1;
flags = strtoll(s, &endptr, 16);
if (*endptr != '\n' || s == endptr) {
break;
}
s = endptr + 1;
if (start) {
size = end - start + 1;
} else {
size = 0;
}
if (flags & IORESOURCE_IO) {
type |= XEN_HOST_PCI_REGION_TYPE_IO;
}
if (flags & IORESOURCE_MEM) {
type |= XEN_HOST_PCI_REGION_TYPE_MEM;
}
if (flags & IORESOURCE_PREFETCH) {
type |= XEN_HOST_PCI_REGION_TYPE_PREFETCH;
}
if (flags & IORESOURCE_MEM_64) {
type |= XEN_HOST_PCI_REGION_TYPE_MEM_64;
}
if (i < PCI_ROM_SLOT) {
d->io_regions[i].base_addr = start;
d->io_regions[i].size = size;
d->io_regions[i].type = type;
d->io_regions[i].bus_flags = flags & IORESOURCE_BITS;
} else {
d->rom.base_addr = start;
d->rom.size = size;
d->rom.type = type;
d->rom.bus_flags = flags & IORESOURCE_BITS;
}
}
if (i != PCI_NUM_REGIONS) {
error_setg(errp, "Invalid format or input too short: %s", buf);
}
out:
close(fd);
}
/* This size should be enough to read a long from a file */
#define XEN_HOST_PCI_GET_VALUE_BUFFER_SIZE 22
static void xen_host_pci_get_value(XenHostPCIDevice *d, const char *name,
unsigned int *pvalue, int base, Error **errp)
{
char path[PATH_MAX];
char buf[XEN_HOST_PCI_GET_VALUE_BUFFER_SIZE];
int fd, rc;
unsigned long value;
const char *endptr;
xen_host_pci_sysfs_path(d, name, path, sizeof(path));
fd = open(path, O_RDONLY);
if (fd == -1) {
error_setg_file_open(errp, errno, path);
return;
}
do {
rc = read(fd, &buf, sizeof(buf) - 1);
if (rc < 0 && errno != EINTR) {
error_setg_errno(errp, errno, "read err");
goto out;
}
} while (rc < 0);
buf[rc] = 0;
rc = qemu_strtoul(buf, &endptr, base, &value);
if (!rc) {
assert(value <= UINT_MAX);
*pvalue = value;
} else {
error_setg_errno(errp, -rc, "failed to parse value '%s'", buf);
}
out:
close(fd);
}
static inline void xen_host_pci_get_hex_value(XenHostPCIDevice *d,
const char *name,
unsigned int *pvalue,
Error **errp)
{
xen_host_pci_get_value(d, name, pvalue, 16, errp);
}
static inline void xen_host_pci_get_dec_value(XenHostPCIDevice *d,
const char *name,
unsigned int *pvalue,
Error **errp)
{
xen_host_pci_get_value(d, name, pvalue, 10, errp);
}
static bool xen_host_pci_dev_is_virtfn(XenHostPCIDevice *d)
{
char path[PATH_MAX];
struct stat buf;
xen_host_pci_sysfs_path(d, "physfn", path, sizeof(path));
return !stat(path, &buf);
}
static void xen_host_pci_config_open(XenHostPCIDevice *d, Error **errp)
{
char path[PATH_MAX];
xen_host_pci_sysfs_path(d, "config", path, sizeof(path));
d->config_fd = open(path, O_RDWR);
if (d->config_fd == -1) {
error_setg_file_open(errp, errno, path);
}
}
static int xen_host_pci_config_read(XenHostPCIDevice *d,
int pos, void *buf, int len)
{
int rc;
do {
rc = pread(d->config_fd, buf, len, pos);
} while (rc < 0 && (errno == EINTR || errno == EAGAIN));
if (rc != len) {
return -errno;
}
return 0;
}
static int xen_host_pci_config_write(XenHostPCIDevice *d,
int pos, const void *buf, int len)
{
int rc;
do {
rc = pwrite(d->config_fd, buf, len, pos);
} while (rc < 0 && (errno == EINTR || errno == EAGAIN));
if (rc != len) {
return -errno;
}
return 0;
}
int xen_host_pci_get_byte(XenHostPCIDevice *d, int pos, uint8_t *p)
{
uint8_t buf;
int rc = xen_host_pci_config_read(d, pos, &buf, 1);
if (!rc) {
*p = buf;
}
return rc;
}
int xen_host_pci_get_word(XenHostPCIDevice *d, int pos, uint16_t *p)
{
uint16_t buf;
int rc = xen_host_pci_config_read(d, pos, &buf, 2);
if (!rc) {
*p = le16_to_cpu(buf);
}
return rc;
}
int xen_host_pci_get_long(XenHostPCIDevice *d, int pos, uint32_t *p)
{
uint32_t buf;
int rc = xen_host_pci_config_read(d, pos, &buf, 4);
if (!rc) {
*p = le32_to_cpu(buf);
}
return rc;
}
int xen_host_pci_get_block(XenHostPCIDevice *d, int pos, uint8_t *buf, int len)
{
return xen_host_pci_config_read(d, pos, buf, len);
}
int xen_host_pci_set_byte(XenHostPCIDevice *d, int pos, uint8_t data)
{
return xen_host_pci_config_write(d, pos, &data, 1);
}
int xen_host_pci_set_word(XenHostPCIDevice *d, int pos, uint16_t data)
{
data = cpu_to_le16(data);
return xen_host_pci_config_write(d, pos, &data, 2);
}
int xen_host_pci_set_long(XenHostPCIDevice *d, int pos, uint32_t data)
{
data = cpu_to_le32(data);
return xen_host_pci_config_write(d, pos, &data, 4);
}
int xen_host_pci_set_block(XenHostPCIDevice *d, int pos, uint8_t *buf, int len)
{
return xen_host_pci_config_write(d, pos, buf, len);
}
int xen_host_pci_find_ext_cap_offset(XenHostPCIDevice *d, uint32_t cap)
{
uint32_t header = 0;
int max_cap = XEN_HOST_PCI_MAX_EXT_CAP;
int pos = PCI_CONFIG_SPACE_SIZE;
do {
if (xen_host_pci_get_long(d, pos, &header)) {
break;
}
/*
* If we have no capabilities, this is indicated by cap ID,
* cap version and next pointer all being 0.
*/
if (header == 0) {
break;
}
if (PCI_EXT_CAP_ID(header) == cap) {
return pos;
}
pos = PCI_EXT_CAP_NEXT(header);
if (pos < PCI_CONFIG_SPACE_SIZE) {
break;
}
max_cap--;
} while (max_cap > 0);
return -1;
}
void xen_host_pci_device_get(XenHostPCIDevice *d, uint16_t domain,
uint8_t bus, uint8_t dev, uint8_t func,
Error **errp)
{
ERRP_GUARD();
unsigned int v;
d->config_fd = -1;
d->domain = domain;
d->bus = bus;
d->dev = dev;
d->func = func;
xen_host_pci_config_open(d, errp);
if (*errp) {
goto error;
}
xen_host_pci_get_resource(d, errp);
if (*errp) {
goto error;
}
xen_host_pci_get_hex_value(d, "vendor", &v, errp);
if (*errp) {
goto error;
}
d->vendor_id = v;
xen_host_pci_get_hex_value(d, "device", &v, errp);
if (*errp) {
goto error;
}
d->device_id = v;
xen_host_pci_get_dec_value(d, "irq", &v, errp);
if (*errp) {
goto error;
}
d->irq = v;
xen_host_pci_get_hex_value(d, "class", &v, errp);
if (*errp) {
goto error;
}
d->class_code = v;
d->is_virtfn = xen_host_pci_dev_is_virtfn(d);
return;
error:
if (d->config_fd >= 0) {
close(d->config_fd);
d->config_fd = -1;
}
}
bool xen_host_pci_device_closed(XenHostPCIDevice *d)
{
return d->config_fd == -1;
}
void xen_host_pci_device_put(XenHostPCIDevice *d)
{
if (d->config_fd >= 0) {
close(d->config_fd);
d->config_fd = -1;
}
}
Reference in New Issue View Git Blame Copy Permalink