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/*
* The PCI Library -- Reading of Bus Dumps
*
* Copyright (c) 1997--2008 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
*/
#include <stdio.h>
#include <ctype.h>
#include <string.h>
#include <errno.h>
#include "internal.h"
struct dump_data {
int len, allocated;
byte data[1];
};
static void
dump_config(struct pci_access *a)
{
pci_define_param(a, "dump.name", "", "Name of the bus dump file to read from");
}
static int
dump_detect(struct pci_access *a)
{
char *name = pci_get_param(a, "dump.name");
return name && name[0];
}
static void
dump_alloc_data(struct pci_dev *dev, int len)
{
struct dump_data *dd = pci_malloc(dev->access, sizeof(struct dump_data) + len - 1);
dd->allocated = len;
dd->len = 0;
memset(dd->data, 0xff, len);
dev->backend_data = dd;
}
static int
dump_validate(char *s, char *fmt)
{
while (*fmt)
{
if (*fmt == '#' ? !isxdigit(*s) : *fmt != *s)
return 0;
fmt++, s++;
}
return 1;
}
static void
dump_init(struct pci_access *a)
{
char *name = pci_get_param(a, "dump.name");
FILE *f;
char buf[256];
struct pci_dev *dev = NULL;
int len, mn, bn, dn, fn, i, j;
if (!name)
a->error("dump: File name not given.");
if (!(f = fopen(name, "r")))
a->error("dump: Cannot open %s: %s", name, strerror(errno));
while (fgets(buf, sizeof(buf)-1, f))
{
char *z = strchr(buf, '\n');
if (!z)
{
fclose(f);
a->error("dump: line too long or unterminated");
}
*z-- = 0;
if (z >= buf && *z == '\r')
*z-- = 0;
len = z - buf + 1;
mn = 0;
if (dump_validate(buf, "##:##.# ") && sscanf(buf, "%x:%x.%d", &bn, &dn, &fn) == 3 ||
dump_validate(buf, "####:##:##.# ") && sscanf(buf, "%x:%x:%x.%d", &mn, &bn, &dn, &fn) == 4 ||
dump_validate(buf, "#####:##:##.# ") && sscanf(buf, "%x:%x:%x.%d", &mn, &bn, &dn, &fn) == 4 ||
dump_validate(buf, "######:##:##.# ") && sscanf(buf, "%x:%x:%x.%d", &mn, &bn, &dn, &fn) == 4)
{
dev = pci_get_dev(a, mn, bn, dn, fn);
dump_alloc_data(dev, 256);
pci_link_dev(a, dev);
}
else if (!len)
dev = NULL;
else if (dev &&
(dump_validate(buf, "##: ") || dump_validate(buf, "###: ") || dump_validate(buf, "####: ") ||
dump_validate(buf, "#####: ") || dump_validate(buf, "######: ") ||
dump_validate(buf, "#######: ") || dump_validate(buf, "########: ")) &&
sscanf(buf, "%x: ", &i) == 1)
{
struct dump_data *dd = dev->backend_data;
z = strchr(buf, ' ') + 1;
while (isxdigit(z[0]) && isxdigit(z[1]) && (!z[2] || z[2] == ' ') &&
sscanf(z, "%x", &j) == 1 && j < 256)
{
if (i >= 4096)
{
fclose(f);
a->error("dump: At most 4096 bytes of config space are supported");
}
if (i >= dd->allocated) /* Need to re-allocate the buffer */
{
dump_alloc_data(dev, 4096);
memcpy(((struct dump_data *) dev->backend_data)->data, dd->data, 256);
pci_mfree(dd);
dd = dev->backend_data;
}
dd->data[i++] = j;
if (i > dd->len)
dd->len = i;
z += 2;
if (*z)
z++;
}
if (*z)
{
fclose(f);
a->error("dump: Malformed line");
}
}
}
fclose(f);
}
static void
dump_cleanup(struct pci_access *a UNUSED)
{
}
static void
dump_scan(struct pci_access *a UNUSED)
{
}
static int
dump_read(struct pci_dev *d, int pos, byte *buf, int len)
{
struct dump_data *dd;
if (!(dd = d->backend_data))
{
struct pci_dev *e = d->access->devices;
while (e && (e->domain != d->domain || e->bus != d->bus || e->dev != d->dev || e->func != d->func))
e = e->next;
if (!e)
return 0;
dd = e->backend_data;
}
if (pos + len > dd->len)
return 0;
memcpy(buf, dd->data + pos, len);
return 1;
}
static int
dump_write(struct pci_dev *d UNUSED, int pos UNUSED, byte *buf UNUSED, int len UNUSED)
{
d->access->error("Writing to dump files is not supported.");
return 0;
}
static void
dump_cleanup_dev(struct pci_dev *d)
{
if (d->backend_data)
{
pci_mfree(d->backend_data);
d->backend_data = NULL;
}
}
struct pci_methods pm_dump = {
.name = "dump",
.help = "Reading of register dumps (set the `dump.name' parameter)",
.config = dump_config,
.detect = dump_detect,
.init = dump_init,
.cleanup = dump_cleanup,
.scan = dump_scan,
.fill_info = pci_generic_fill_info,
.read = dump_read,
.write = dump_write,
.cleanup_dev = dump_cleanup_dev,
};
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