* 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);
static void
sysfs_fill_info(struct pci_dev *d, unsigned int flags)
{
+ int value, want_class, want_class_ext;
+
if (!d->access->buscentric)
{
/*
d->vendor_id = sysfs_get_value(d, "vendor", 1);
d->device_id = sysfs_get_value(d, "device", 1);
}
- if (want_fill(d, flags, PCI_FILL_CLASS))
- d->device_class = sysfs_get_value(d, "class", 1) >> 8;
+ 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 (want_fill(d, flags, PCI_FILL_SUBSYS))
+ {
+ 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 (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);
+ 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 (want_fill(d, flags, PCI_FILL_PHYS_SLOT))
}
}
+ 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);
}
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