* The PCI Library -- Configuration Access via /sys/bus/pci
*
* Copyright (c) 2003 Matthew Wilcox <matthew@wil.cx>
- * Copyright (c) 1997--2008 Martin Mares <mj@ucw.cz>
+ * Copyright (c) 1997--2023 Martin Mares <mj@ucw.cz>
*
- * Can be freely distributed and used under the terms of the GNU GPL.
+ * Can be freely distributed and used under the terms of the GNU GPL v2+.
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
*/
#define _GNU_SOURCE
#include <sys/types.h>
#include "internal.h"
-#include "pread.h"
static void
sysfs_config(struct pci_access *a)
return 0;
}
n = read(fd, buf, OBJBUFSIZE);
+ int read_errno = errno;
close(fd);
if (n < 0)
{
- warn("Error reading %s: %s", namebuf, strerror(errno));
+ warn("Error reading %s: %s", namebuf, strerror(read_errno));
return 0;
- }
+ }
if (n >= OBJBUFSIZE)
{
warn("Value in %s too long", namebuf);
{
struct pci_access *a = d->access;
char namebuf[OBJNAMELEN], buf[256];
+ struct { pciaddr_t flags, base_addr, size; } lines[10];
+ int have_bar_bases, have_rom_base, have_bridge_bases;
FILE *file;
int i;
+ have_bar_bases = have_rom_base = have_bridge_bases = 0;
sysfs_obj_name(d, "resource", namebuf);
file = fopen(namebuf, "r");
if (!file)
a->error("Cannot open %s: %s", namebuf, strerror(errno));
- for (i = 0; i < 7; i++)
+ for (i = 0; i < 7+6+4+1; i++)
{
unsigned long long start, end, size, flags;
if (!fgets(buf, sizeof(buf), file))
flags &= PCI_ADDR_FLAG_MASK;
d->base_addr[i] = start | flags;
d->size[i] = size;
+ have_bar_bases = 1;
}
- else
+ else if (i == 6)
{
d->rom_flags = flags;
flags &= PCI_ADDR_FLAG_MASK;
d->rom_base_addr = start | flags;
d->rom_size = size;
+ have_rom_base = 1;
}
+ else if (i < 7+6+4)
+ {
+ /*
+ * If kernel was compiled without CONFIG_PCI_IOV option then after
+ * the ROM line for configured bridge device (that which had set
+ * subordinary bus number to non-zero value) are four additional lines
+ * which describe resources behind bridge. For PCI-to-PCI bridges they
+ * are: IO, MEM, PREFMEM and empty. For CardBus bridges they are: IO0,
+ * IO1, MEM0 and MEM1. For unconfigured bridges and other devices
+ * there is no additional line after the ROM line. If kernel was
+ * compiled with CONFIG_PCI_IOV option then after the ROM line and
+ * before the first bridge resource line are six additional lines
+ * which describe IOV resources. Read all remaining lines in resource
+ * file and based on the number of remaining lines (0, 4, 6, 10) parse
+ * resources behind bridge.
+ */
+ lines[i-7].flags = flags;
+ lines[i-7].base_addr = start;
+ lines[i-7].size = size;
+ }
+ }
+ if (i == 7+4 || i == 7+6+4)
+ {
+ int offset = (i == 7+6+4) ? 6 : 0;
+ for (i = 0; i < 4; i++)
+ {
+ d->bridge_flags[i] = lines[offset+i].flags;
+ d->bridge_base_addr[i] = lines[offset+i].base_addr;
+ d->bridge_size[i] = lines[offset+i].size;
+ }
+ have_bridge_bases = 1;
}
fclose(file);
+ if (!have_bar_bases)
+ clear_fill(d, PCI_FILL_BASES | PCI_FILL_SIZES | PCI_FILL_IO_FLAGS);
+ if (!have_rom_base)
+ clear_fill(d, PCI_FILL_ROM_BASE);
+ if (!have_bridge_bases)
+ clear_fill(d, PCI_FILL_BRIDGE_BASES);
}
static void sysfs_scan(struct pci_access *a)
closedir(dir);
}
-static unsigned int
+static void
sysfs_fill_info(struct pci_dev *d, unsigned int flags)
{
- unsigned int done = 0;
+ int value, want_class, want_class_ext;
if (!d->access->buscentric)
{
* the kernel's view, which has regions and IRQs remapped and other fields
* (most importantly classes) possibly fixed if the device is known broken.
*/
- if (flags & PCI_FILL_IDENT)
+ if (want_fill(d, flags, PCI_FILL_IDENT))
{
d->vendor_id = sysfs_get_value(d, "vendor", 1);
d->device_id = sysfs_get_value(d, "device", 1);
- done |= PCI_FILL_IDENT;
}
- if (flags & PCI_FILL_CLASS)
- {
- d->device_class = sysfs_get_value(d, "class", 1) >> 8;
- done |= PCI_FILL_CLASS;
+ want_class = want_fill(d, flags, PCI_FILL_CLASS);
+ want_class_ext = want_fill(d, flags, PCI_FILL_CLASS_EXT);
+ if (want_class || want_class_ext)
+ {
+ value = sysfs_get_value(d, "class", 1);
+ if (want_class)
+ d->device_class = value >> 8;
+ if (want_class_ext)
+ {
+ d->prog_if = value & 0xff;
+ value = sysfs_get_value(d, "revision", 0);
+ if (value < 0)
+ value = pci_read_byte(d, PCI_REVISION_ID);
+ if (value >= 0)
+ d->rev_id = value;
+ }
}
- if (flags & PCI_FILL_IRQ)
+ if (want_fill(d, flags, PCI_FILL_SUBSYS))
{
- d->irq = sysfs_get_value(d, "irq", 1);
- done |= PCI_FILL_IRQ;
+ value = sysfs_get_value(d, "subsystem_vendor", 0);
+ if (value >= 0)
+ {
+ d->subsys_vendor_id = value;
+ value = sysfs_get_value(d, "subsystem_device", 0);
+ if (value >= 0)
+ d->subsys_id = value;
+ }
+ else
+ clear_fill(d, PCI_FILL_SUBSYS);
}
- if (flags & (PCI_FILL_BASES | PCI_FILL_ROM_BASE | PCI_FILL_SIZES | PCI_FILL_IO_FLAGS))
- {
+ if (want_fill(d, flags, PCI_FILL_IRQ))
+ d->irq = sysfs_get_value(d, "irq", 1);
+ if (want_fill(d, flags, PCI_FILL_BASES | PCI_FILL_ROM_BASE | PCI_FILL_SIZES | PCI_FILL_IO_FLAGS | PCI_FILL_BRIDGE_BASES))
sysfs_get_resources(d);
- done |= PCI_FILL_BASES | PCI_FILL_ROM_BASE | PCI_FILL_SIZES | PCI_FILL_IO_FLAGS;
+ if (want_fill(d, flags, PCI_FILL_PARENT))
+ {
+ unsigned int domain, bus, dev, func;
+ char *path_abs, *path_canon, *name;
+ char path_rel[OBJNAMELEN];
+ struct pci_dev *parent;
+
+ /* Construct sysfs path for parent device */
+ sysfs_obj_name(d, "..", path_rel);
+ path_abs = realpath(path_rel, NULL);
+ name = path_abs ? strrchr(path_abs, '/') : NULL;
+ name = name ? name+1 : name;
+ parent = NULL;
+
+ if (name && sscanf(name, "%x:%x:%x.%d", &domain, &bus, &dev, &func) == 4 && domain <= 0x7fffffff)
+ for (parent = d->access->devices; parent; parent = parent->next)
+ if (parent->domain == (int)domain && parent->bus == bus && parent->dev == dev && parent->func == func)
+ break;
+
+ if (parent)
+ {
+ /* Check if parsed BDF address from parent sysfs device is really expected PCI device */
+ sysfs_obj_name(parent, ".", path_rel);
+ path_canon = realpath(path_rel, NULL);
+ if (!path_canon || strcmp(path_canon, path_abs) != 0)
+ parent = NULL;
+
+ if (path_canon)
+ free(path_canon);
+ }
+
+ if (parent)
+ d->parent = parent;
+ else
+ clear_fill(d, PCI_FILL_PARENT);
+
+ if (path_abs)
+ free(path_abs);
}
}
- if (flags & PCI_FILL_PHYS_SLOT)
+ if (want_fill(d, flags, PCI_FILL_PHYS_SLOT))
{
struct pci_dev *pd;
sysfs_fill_slots(d->access);
for (pd = d->access->devices; pd; pd = pd->next)
pd->known_fields |= PCI_FILL_PHYS_SLOT;
- done |= PCI_FILL_PHYS_SLOT;
}
- if (flags & PCI_FILL_MODULE_ALIAS)
+ if (want_fill(d, flags, PCI_FILL_MODULE_ALIAS))
{
char buf[OBJBUFSIZE];
if (sysfs_get_string(d, "modalias", buf, 0))
d->module_alias = pci_set_property(d, PCI_FILL_MODULE_ALIAS, buf);
- done |= PCI_FILL_MODULE_ALIAS;
}
- if (flags & PCI_FILL_LABEL)
+ if (want_fill(d, flags, PCI_FILL_LABEL))
{
char buf[OBJBUFSIZE];
if (sysfs_get_string(d, "label", buf, 0))
d->label = pci_set_property(d, PCI_FILL_LABEL, buf);
- done |= PCI_FILL_LABEL;
}
- if (flags & PCI_FILL_NUMA_NODE)
+ if (want_fill(d, flags, PCI_FILL_NUMA_NODE))
+ d->numa_node = sysfs_get_value(d, "numa_node", 0);
+
+ if (want_fill(d, flags, PCI_FILL_IOMMU_GROUP))
{
- d->numa_node = sysfs_get_value(d, "numa_node", 0);
- done |= PCI_FILL_NUMA_NODE;
+ char *group_link = sysfs_deref_link(d, "iommu_group");
+ if (group_link)
+ {
+ pci_set_property(d, PCI_FILL_IOMMU_GROUP, basename(group_link));
+ free(group_link);
+ }
}
- if (flags & PCI_FILL_DT_NODE)
+ if (want_fill(d, flags, PCI_FILL_DT_NODE))
{
char *node = sysfs_deref_link(d, "of_node");
if (node)
pci_set_property(d, PCI_FILL_DT_NODE, node);
free(node);
}
- done |= PCI_FILL_DT_NODE;
}
- return done | pci_generic_fill_info(d, flags & ~done);
+ if (want_fill(d, flags, PCI_FILL_DRIVER))
+ {
+ char *driver_path = sysfs_deref_link(d, "driver");
+ if (driver_path)
+ {
+ char *driver = strrchr(driver_path, '/');
+ driver = driver ? driver+1 : driver_path;
+ pci_set_property(d, PCI_FILL_DRIVER, driver);
+ free(driver_path);
+ }
+ else
+ clear_fill(d, PCI_FILL_DRIVER);
+ }
+
+ pci_generic_fill_info(d, flags);
}
/* Intent of the sysfs_setup() caller */
a->fd = open(namebuf, a->fd_rw ? O_RDWR : O_RDONLY);
if (a->fd < 0)
a->warning("Cannot open %s", namebuf);
- a->fd_pos = 0;
}
return a->fd;
}
if (fd < 0)
return 0;
- res = do_read(d, fd, buf, len, pos);
+ res = pread(fd, buf, len, pos);
if (res < 0)
{
d->access->warning("sysfs_read: read failed: %s", strerror(errno));
if (fd < 0)
return 0;
- res = do_write(d, fd, buf, len, pos);
+ res = pwrite(fd, buf, len, pos);
if (res < 0)
{
d->access->warning("sysfs_write: write failed: %s", strerror(errno));
return 1;
}
-#ifdef PCI_HAVE_DO_READ
-
-/* pread() is not available and do_read() only works for a single fd, so we
- * cannot implement read_vpd properly. */
-static int sysfs_read_vpd(struct pci_dev *d, int pos, byte *buf, int len)
-{
- return 0;
-}
-
-#else /* !PCI_HAVE_DO_READ */
-
static int sysfs_read_vpd(struct pci_dev *d, int pos, byte *buf, int len)
{
int fd = sysfs_setup(d, SETUP_READ_VPD);
return 1;
}
-#endif /* PCI_HAVE_DO_READ */
-
static void sysfs_cleanup_dev(struct pci_dev *d)
{
struct pci_access *a = d->access;
}
struct pci_methods pm_linux_sysfs = {
- "linux-sysfs",
- "The sys filesystem on Linux",
- sysfs_config,
- sysfs_detect,
- sysfs_init,
- sysfs_cleanup,
- sysfs_scan,
- sysfs_fill_info,
- sysfs_read,
- sysfs_write,
- sysfs_read_vpd,
- NULL, /* init_dev */
- sysfs_cleanup_dev
+ .name = "linux-sysfs",
+ .help = "The sys filesystem on Linux",
+ .config = sysfs_config,
+ .detect = sysfs_detect,
+ .init = sysfs_init,
+ .cleanup = sysfs_cleanup,
+ .scan = sysfs_scan,
+ .fill_info = sysfs_fill_info,
+ .read = sysfs_read,
+ .write = sysfs_write,
+ .read_vpd = sysfs_read_vpd,
+ .cleanup_dev = sysfs_cleanup_dev,
};
projects / pciutils.git / blobdiff