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/*
* The PCI Library -- Configuration Access via /proc/bus/pci
*
* Copyright (c) 1997--2023 Martin Mares <mj@ucw.cz>
*
* 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 <stdio.h>
#include <string.h>
#include <unistd.h>
#include <ctype.h>
#include <errno.h>
#include <fcntl.h>
#include <sys/types.h>
#include "internal.h"
static void
proc_config(struct pci_access *a)
{
pci_define_param(a, "proc.path", PCI_PATH_PROC_BUS_PCI, "Path to the procfs bus tree");
}
static int
proc_detect(struct pci_access *a)
{
char *name = pci_get_param(a, "proc.path");
if (access(name, R_OK))
{
a->warning("Cannot open %s", name);
return 0;
}
a->debug("...using %s", name);
return 1;
}
static void
proc_init(struct pci_access *a)
{
a->fd = -1;
}
static void
proc_cleanup(struct pci_access *a)
{
if (a->fd >= 0)
{
close(a->fd);
a->fd = -1;
}
}
static void
proc_scan(struct pci_access *a)
{
FILE *f;
char buf[512];
if (snprintf(buf, sizeof(buf), "%s/devices", pci_get_param(a, "proc.path")) == sizeof(buf))
a->error("File name too long");
f = fopen(buf, "r");
if (!f)
a->error("Cannot open %s", buf);
while (fgets(buf, sizeof(buf)-1, f))
{
struct pci_dev *d = pci_alloc_dev(a);
unsigned int dfn, vend, cnt, known;
char *driver;
int offset;
#define F " " PCIADDR_T_FMT
cnt = sscanf(buf, "%x %x %x" F F F F F F F F F F F F F F "%n",
&dfn,
&vend,
&d->irq,
&d->base_addr[0],
&d->base_addr[1],
&d->base_addr[2],
&d->base_addr[3],
&d->base_addr[4],
&d->base_addr[5],
&d->rom_base_addr,
&d->size[0],
&d->size[1],
&d->size[2],
&d->size[3],
&d->size[4],
&d->size[5],
&d->rom_size,
&offset);
#undef F
if (cnt != 9 && cnt != 10 && cnt != 17)
a->error("proc: parse error (read only %d items)", cnt);
d->bus = dfn >> 8U;
d->dev = PCI_SLOT(dfn & 0xff);
d->func = PCI_FUNC(dfn & 0xff);
d->vendor_id = vend >> 16U;
d->device_id = vend & 0xffff;
known = 0;
if (!a->buscentric)
{
known |= PCI_FILL_IDENT | PCI_FILL_IRQ | PCI_FILL_BASES;
if (cnt >= 10)
known |= PCI_FILL_ROM_BASE;
if (cnt >= 17)
known |= PCI_FILL_SIZES;
}
if (cnt >= 17)
{
while (buf[offset] && isspace(buf[offset]))
++offset;
driver = &buf[offset];
while (buf[offset] && !isspace(buf[offset]))
++offset;
buf[offset] = '\0';
if (driver[0])
{
pci_set_property(d, PCI_FILL_DRIVER, driver);
known |= PCI_FILL_DRIVER;
}
}
d->known_fields = known;
pci_link_dev(a, d);
}
fclose(f);
}
static int
proc_setup(struct pci_dev *d, int rw)
{
struct pci_access *a = d->access;
if (a->cached_dev != d || a->fd_rw < rw)
{
char buf[1024];
int e;
if (a->fd >= 0)
close(a->fd);
e = snprintf(buf, sizeof(buf), "%s/%02x/%02x.%d",
pci_get_param(a, "proc.path"),
d->bus, d->dev, d->func);
if (e < 0 || e >= (int) sizeof(buf))
a->error("File name too long");
a->fd_rw = a->writeable || rw;
a->fd = open(buf, a->fd_rw ? O_RDWR : O_RDONLY);
if (a->fd < 0)
{
e = snprintf(buf, sizeof(buf), "%s/%04x:%02x/%02x.%d",
pci_get_param(a, "proc.path"),
d->domain, d->bus, d->dev, d->func);
if (e < 0 || e >= (int) sizeof(buf))
a->error("File name too long");
a->fd = open(buf, a->fd_rw ? O_RDWR : O_RDONLY);
}
if (a->fd < 0)
a->warning("Cannot open %s", buf);
a->cached_dev = d;
}
return a->fd;
}
static int
proc_read(struct pci_dev *d, int pos, byte *buf, int len)
{
int fd = proc_setup(d, 0);
int res;
if (fd < 0)
return 0;
res = pread(fd, buf, len, pos);
if (res < 0)
{
d->access->warning("proc_read: read failed: %s", strerror(errno));
return 0;
}
else if (res != len)
return 0;
return 1;
}
static int
proc_write(struct pci_dev *d, int pos, byte *buf, int len)
{
int fd = proc_setup(d, 1);
int res;
if (fd < 0)
return 0;
res = pwrite(fd, buf, len, pos);
if (res < 0)
{
d->access->warning("proc_write: write failed: %s", strerror(errno));
return 0;
}
else if (res != len)
{
d->access->warning("proc_write: tried to write %d bytes at %d, but only %d succeeded", len, pos, res);
return 0;
}
return 1;
}
static void
proc_cleanup_dev(struct pci_dev *d)
{
if (d->access->cached_dev == d)
d->access->cached_dev = NULL;
}
struct pci_methods pm_linux_proc = {
.name = "linux-proc",
.help = "The proc file system on Linux",
.config = proc_config,
.detect = proc_detect,
.init = proc_init,
.cleanup = proc_cleanup,
.scan = proc_scan,
.fill_info = pci_generic_fill_info,
.read = proc_read,
.write = proc_write,
.cleanup_dev = proc_cleanup_dev,
};
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