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freebsd/sys/pci/pci.c
Julian Elischer cd8ab93c90 In the cyrix Cx5530, there are null (empty) Base address registers before the 
base register that controls Ultra-DMA, so we need to examine all possible
base registers instead of just giving up at the first empty one.
Also, looking at the source code to the BIOS, I see that they are also
checking for 0xffffffff as an invalid value so do the same. Stefan may like
to clean this up, but at least now I can find my PCI IDE registers.
1998-11-03 08:47:29 +00:00

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/*
* Copyright (c) 1997, Stefan Esser <se@freebsd.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice unmodified, this list of conditions, and the following
* disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* $Id: pci.c,v 1.89 1998/09/16 08:28:11 dfr Exp $
*
*/
#include "pci.h"
#if NPCI > 0
#include "opt_devfs.h"
#include "opt_simos.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/malloc.h>
#include <sys/fcntl.h>
#include <sys/conf.h>
#include <sys/kernel.h>
#include <sys/queue.h>
#include <sys/types.h>
#include <sys/buf.h>
#ifdef DEVFS
#include <sys/devfsext.h>
#endif /* DEVFS */
#include <vm/vm.h>
#include <vm/pmap.h>
#include <vm/vm_extern.h>
#include <pci/pcireg.h>
#include <pci/pcivar.h>
#include <pci/pci_ioctl.h>
#ifdef APIC_IO
#include <machine/smp.h>
#endif /* APIC_IO */
STAILQ_HEAD(devlist, pci_devinfo) pci_devq;
u_int32_t pci_numdevs = 0;
u_int32_t pci_generation = 0;
/* return highest PCI bus number known to be used, or -1 if none */
static int
pci_bushigh(void)
{
if (pci_cfgopen() == 0)
return (-1);
return (0);
}
/* return base address of memory or port map */
static int
pci_mapbase(unsigned mapreg)
{
int mask = 0x03;
if ((mapreg & 0x01) == 0)
mask = 0x0f;
return (mapreg & ~mask);
}
/* return map type of memory or port map */
static int
pci_maptype(unsigned mapreg)
{
static u_int8_t maptype[0x10] = {
PCI_MAPMEM, PCI_MAPPORT,
PCI_MAPMEM, 0,
PCI_MAPMEM, PCI_MAPPORT,
0, 0,
PCI_MAPMEM|PCI_MAPMEMP, PCI_MAPPORT,
PCI_MAPMEM|PCI_MAPMEMP, 0,
PCI_MAPMEM|PCI_MAPMEMP, PCI_MAPPORT,
0, 0,
};
return maptype[mapreg & 0x0f];
}
/* return log2 of map size decoded for memory or port map */
static int
pci_mapsize(unsigned testval)
{
int ln2size;
testval = pci_mapbase(testval);
ln2size = 0;
if (testval != 0) {
while ((testval & 1) == 0)
{
ln2size++;
testval >>= 1;
}
}
return (ln2size);
}
/* return log2 of address range supported by map register */
static int
pci_maprange(unsigned mapreg)
{
int ln2range = 0;
switch (mapreg & 0x07) {
case 0x00:
case 0x01:
case 0x05:
ln2range = 32;
break;
case 0x02:
ln2range = 20;
break;
case 0x04:
ln2range = 64;
break;
}
return (ln2range);
}
/* extract map parameters into newly allocated array of pcimap structures */
static pcimap *
pci_readmaps(pcicfgregs *cfg, int maxmaps)
{
int i, j = 0;
pcimap *map;
int map64 = 0;
int reg = PCIR_MAPS;
for (i = 0; i < maxmaps; i++) {
int reg = PCIR_MAPS + i*4;
u_int32_t base;
u_int32_t ln2range;
base = pci_cfgread(cfg, reg, 4);
ln2range = pci_maprange(base);
if (base == 0 || ln2range == 0 || base == 0xffffffff)
continue; /* skip invalid entry */
else {
j++;
if (ln2range > 32) {
i++;
j++;
}
}
}
map = malloc(j * sizeof (pcimap), M_DEVBUF, M_WAITOK);
if (map != NULL) {
bzero(map, sizeof(pcimap) * j);
cfg->nummaps = j;
for (i = 0, j = 0; i < maxmaps; i++, reg += 4) {
u_int32_t base;
u_int32_t testval;
base = pci_cfgread(cfg, reg, 4);
if (map64 == 0) {
if (base == 0 || base == 0xffffffff)
continue; /* skip invalid entry */
pci_cfgwrite(cfg, reg, 0xffffffff, 4);
testval = pci_cfgread(cfg, reg, 4);
pci_cfgwrite(cfg, reg, base, 4);
map[j].base = pci_mapbase(base);
map[j].type = pci_maptype(base);
map[j].ln2size = pci_mapsize(testval);
map[j].ln2range = pci_maprange(testval);
map64 = map[j].ln2range == 64;
} else {
/* only fill in base, other fields are 0 */
map[j].base = base;
map64 = 0;
}
j++;
}
}
return (map);
}
/* adjust some values from PCI 1.0 devices to match 2.0 standards ... */
static void
pci_fixancient(pcicfgregs *cfg)
{
if (cfg->hdrtype != 0)
return;
/* PCI to PCI bridges use header type 1 */
if (cfg->baseclass == PCIC_BRIDGE && cfg->subclass == PCIS_BRIDGE_PCI)
cfg->hdrtype = 1;
}
/* read config data specific to header type 1 device (PCI to PCI bridge) */
static void *
pci_readppb(pcicfgregs *cfg)
{
pcih1cfgregs *p;
p = malloc(sizeof (pcih1cfgregs), M_DEVBUF, M_WAITOK);
if (p == NULL)
return (NULL);
bzero(p, sizeof *p);
p->secstat = pci_cfgread(cfg, PCIR_SECSTAT_1, 2);
p->bridgectl = pci_cfgread(cfg, PCIR_BRIDGECTL_1, 2);
p->seclat = pci_cfgread(cfg, PCIR_SECLAT_1, 1);
p->iobase = PCI_PPBIOBASE (pci_cfgread(cfg, PCIR_IOBASEH_1, 2),
pci_cfgread(cfg, PCIR_IOBASEL_1, 1));
p->iolimit = PCI_PPBIOLIMIT (pci_cfgread(cfg, PCIR_IOLIMITH_1, 2),
pci_cfgread(cfg, PCIR_IOLIMITL_1, 1));
p->membase = PCI_PPBMEMBASE (0,
pci_cfgread(cfg, PCIR_MEMBASE_1, 2));
p->memlimit = PCI_PPBMEMLIMIT (0,
pci_cfgread(cfg, PCIR_MEMLIMIT_1, 2));
p->pmembase = PCI_PPBMEMBASE (
(pci_addr_t)pci_cfgread(cfg, PCIR_PMBASEH_1, 4),
pci_cfgread(cfg, PCIR_PMBASEL_1, 2));
p->pmemlimit = PCI_PPBMEMLIMIT (
(pci_addr_t)pci_cfgread(cfg, PCIR_PMLIMITH_1, 4),
pci_cfgread(cfg, PCIR_PMLIMITL_1, 2));
return (p);
}
/* read config data specific to header type 2 device (PCI to CardBus bridge) */
static void *
pci_readpcb(pcicfgregs *cfg)
{
pcih2cfgregs *p;
p = malloc(sizeof (pcih2cfgregs), M_DEVBUF, M_WAITOK);
if (p == NULL)
return (NULL);
bzero(p, sizeof *p);
p->secstat = pci_cfgread(cfg, PCIR_SECSTAT_2, 2);
p->bridgectl = pci_cfgread(cfg, PCIR_BRIDGECTL_2, 2);
p->seclat = pci_cfgread(cfg, PCIR_SECLAT_2, 1);
p->membase0 = pci_cfgread(cfg, PCIR_MEMBASE0_2, 4);
p->memlimit0 = pci_cfgread(cfg, PCIR_MEMLIMIT0_2, 4);
p->membase1 = pci_cfgread(cfg, PCIR_MEMBASE1_2, 4);
p->memlimit1 = pci_cfgread(cfg, PCIR_MEMLIMIT1_2, 4);
p->iobase0 = pci_cfgread(cfg, PCIR_IOBASE0_2, 4);
p->iolimit0 = pci_cfgread(cfg, PCIR_IOLIMIT0_2, 4);
p->iobase1 = pci_cfgread(cfg, PCIR_IOBASE1_2, 4);
p->iolimit1 = pci_cfgread(cfg, PCIR_IOLIMIT1_2, 4);
p->pccardif = pci_cfgread(cfg, PCIR_PCCARDIF_2, 4);
return p;
}
/* extract header type specific config data */
static void
pci_hdrtypedata(pcicfgregs *cfg)
{
switch (cfg->hdrtype) {
case 0:
cfg->subvendor = pci_cfgread(cfg, PCIR_SUBVEND_0, 2);
cfg->subdevice = pci_cfgread(cfg, PCIR_SUBDEV_0, 2);
cfg->map = pci_readmaps(cfg, PCI_MAXMAPS_0);
break;
case 1:
cfg->subvendor = pci_cfgread(cfg, PCIR_SUBVEND_1, 2);
cfg->subdevice = pci_cfgread(cfg, PCIR_SUBDEV_1, 2);
cfg->secondarybus = pci_cfgread(cfg, PCIR_SECBUS_1, 1);
cfg->subordinatebus = pci_cfgread(cfg, PCIR_SUBBUS_1, 1);
cfg->map = pci_readmaps(cfg, PCI_MAXMAPS_1);
cfg->hdrspec = pci_readppb(cfg);
break;
case 2:
cfg->subvendor = pci_cfgread(cfg, PCIR_SUBVEND_2, 2);
cfg->subdevice = pci_cfgread(cfg, PCIR_SUBDEV_2, 2);
cfg->secondarybus = pci_cfgread(cfg, PCIR_SECBUS_2, 1);
cfg->subordinatebus = pci_cfgread(cfg, PCIR_SUBBUS_2, 1);
cfg->map = pci_readmaps(cfg, PCI_MAXMAPS_2);
cfg->hdrspec = pci_readpcb(cfg);
break;
}
}
/* read configuration header into pcicfgrect structure */
static struct pci_devinfo *
pci_readcfg(pcicfgregs *probe)
{
pcicfgregs *cfg = NULL;
struct pci_devinfo *devlist_entry;
struct devlist *devlist_head;
devlist_head = &pci_devq;
devlist_entry = NULL;
if (pci_cfgread(probe, PCIR_DEVVENDOR, 4) != -1) {
devlist_entry = malloc(sizeof(struct pci_devinfo),
M_DEVBUF, M_WAITOK);
if (devlist_entry == NULL)
return (NULL);
cfg = &devlist_entry->cfg;
bzero(cfg, sizeof *cfg);
cfg->bus = probe->bus;
cfg->slot = probe->slot;
cfg->func = probe->func;
cfg->vendor = pci_cfgread(cfg, PCIR_VENDOR, 2);
cfg->device = pci_cfgread(cfg, PCIR_DEVICE, 2);
cfg->cmdreg = pci_cfgread(cfg, PCIR_COMMAND, 2);
cfg->statreg = pci_cfgread(cfg, PCIR_STATUS, 2);
cfg->baseclass = pci_cfgread(cfg, PCIR_CLASS, 1);
cfg->subclass = pci_cfgread(cfg, PCIR_SUBCLASS, 1);
cfg->progif = pci_cfgread(cfg, PCIR_PROGIF, 1);
cfg->revid = pci_cfgread(cfg, PCIR_REVID, 1);
cfg->hdrtype = pci_cfgread(cfg, PCIR_HEADERTYPE, 1);
cfg->cachelnsz = pci_cfgread(cfg, PCIR_CACHELNSZ, 1);
cfg->lattimer = pci_cfgread(cfg, PCIR_LATTIMER, 1);
cfg->intpin = pci_cfgread(cfg, PCIR_INTPIN, 1);
cfg->intline = pci_cfgread(cfg, PCIR_INTLINE, 1);
#ifdef __alpha__
alpha_platform_assign_pciintr(cfg);
#endif
#ifdef APIC_IO
if (cfg->intpin != 0) {
int airq;
airq = pci_apic_irq(cfg->bus, cfg->slot, cfg->intpin);
if (airq >= 0) {
/* PCI specific entry found in MP table */
if (airq != cfg->intline) {
undirect_pci_irq(cfg->intline);
cfg->intline = airq;
}
} else {
/*
* PCI interrupts might be redirected to the
* ISA bus according to some MP tables. Use the
* same methods as used by the ISA devices
* devices to find the proper IOAPIC int pin.
*/
airq = isa_apic_irq(cfg->intline);
if ((airq >= 0) && (airq != cfg->intline)) {
/* XXX: undirect_pci_irq() ? */
undirect_isa_irq(cfg->intline);
cfg->intline = airq;
}
}
}
#endif /* APIC_IO */
cfg->mingnt = pci_cfgread(cfg, PCIR_MINGNT, 1);
cfg->maxlat = pci_cfgread(cfg, PCIR_MAXLAT, 1);
cfg->mfdev = (cfg->hdrtype & PCIM_MFDEV) != 0;
cfg->hdrtype &= ~PCIM_MFDEV;
pci_fixancient(cfg);
pci_hdrtypedata(cfg);
STAILQ_INSERT_TAIL(devlist_head, devlist_entry, pci_links);
devlist_entry->conf.pc_sel.pc_bus = cfg->bus;
devlist_entry->conf.pc_sel.pc_dev = cfg->slot;
devlist_entry->conf.pc_sel.pc_func = cfg->func;
devlist_entry->conf.pc_hdr = cfg->hdrtype;
devlist_entry->conf.pc_subvendor = cfg->subvendor;
devlist_entry->conf.pc_subdevice = cfg->subdevice;
devlist_entry->conf.pc_vendor = cfg->vendor;
devlist_entry->conf.pc_device = cfg->device;
devlist_entry->conf.pc_class = cfg->baseclass;
devlist_entry->conf.pc_subclass = cfg->subclass;
devlist_entry->conf.pc_progif = cfg->progif;
devlist_entry->conf.pc_revid = cfg->revid;
pci_numdevs++;
pci_generation++;
}
return (devlist_entry);
}
#if 0
/* free pcicfgregs structure and all depending data structures */
static int
pci_freecfg(struct pci_devinfo *dinfo)
{
struct devlist *devlist_head;
devlist_head = &pci_devq;
if (dinfo->cfg.hdrspec != NULL)
free(dinfo->cfg.hdrspec, M_DEVBUF);
if (dinfo->cfg.map != NULL)
free(dinfo->cfg.map, M_DEVBUF);
/* XXX this hasn't been tested */
STAILQ_REMOVE(devlist_head, dinfo, pci_devinfo, pci_links);
free(dinfo, M_DEVBUF);
/* increment the generation count */
pci_generation++;
/* we're losing one device */
pci_numdevs--;
return (0);
}
#endif
static void
pci_addcfg(struct pci_devinfo *dinfo)
{
if (bootverbose) {
int i;
pcicfgregs *cfg = &dinfo->cfg;
printf("found->\tvendor=0x%04x, dev=0x%04x, revid=0x%02x\n",
cfg->vendor, cfg->device, cfg->revid);
printf("\tclass=%02x-%02x-%02x, hdrtype=0x%02x, mfdev=%d\n",
cfg->baseclass, cfg->subclass, cfg->progif,
cfg->hdrtype, cfg->mfdev);
printf("\tsubordinatebus=%x \tsecondarybus=%x\n",
cfg->subordinatebus, cfg->secondarybus);
#ifdef PCI_DEBUG
printf("\tcmdreg=0x%04x, statreg=0x%04x, cachelnsz=%d (dwords)\n",
cfg->cmdreg, cfg->statreg, cfg->cachelnsz);
printf("\tlattimer=0x%02x (%d ns), mingnt=0x%02x (%d ns), maxlat=0x%02x (%d ns)\n",
cfg->lattimer, cfg->lattimer * 30,
cfg->mingnt, cfg->mingnt * 250, cfg->maxlat, cfg->maxlat * 250);
#endif /* PCI_DEBUG */
if (cfg->intpin > 0)
printf("\tintpin=%c, irq=%d\n", cfg->intpin +'a' -1, cfg->intline);
for (i = 0; i < cfg->nummaps; i++) {
pcimap *m = &cfg->map[i];
printf("\tmap[%d]: type %x, range %2d, base %08x, size %2d\n",
i, m->type, m->ln2range, m->base, m->ln2size);
}
}
pci_drvattach(dinfo); /* XXX currently defined in pci_compat.c */
}
/* return pointer to device that is a bridge to this bus */
static pcicfgregs *
pci_bridgeto(int bus)
{
return (NULL); /* XXX not yet implemented */
}
/* scan one PCI bus for devices */
static int
pci_probebus(int bus)
{
pcicfgregs probe;
int bushigh = bus;
#ifdef SIMOS
#undef PCI_SLOTMAX
#define PCI_SLOTMAX 0
#endif
bzero(&probe, sizeof probe);
/* XXX KDM */
/* probe.parent = pci_bridgeto(bus); */
probe.bus = bus;
for (probe.slot = 0; probe.slot <= PCI_SLOTMAX; probe.slot++) {
int pcifunchigh = 0;
for (probe.func = 0; probe.func <= pcifunchigh; probe.func++) {
struct pci_devinfo *dinfo = pci_readcfg(&probe);
if (dinfo != NULL) {
if (dinfo->cfg.mfdev)
pcifunchigh = 7;
/*
* XXX: Temporarily move pci_addcfg() up before
* the use of cfg->subordinatebus. This is
* necessary, since pci_addcfg() calls the
* device's probe(), which may read the bus#
* from some device dependent register of
* some host to PCI bridges. The probe will
* eventually be moved to pci_readcfg(), and
* pci_addcfg() will then be moved back down
* below the conditional statement ...
*/
pci_addcfg(dinfo);
if (bushigh < dinfo->cfg.subordinatebus)
bushigh = dinfo->cfg.subordinatebus;
if (bushigh < dinfo->cfg.secondarybus)
bushigh = dinfo->cfg.secondarybus;
/* XXX KDM */
/* cfg = NULL; we don't own this anymore ... */
}
}
}
return (bushigh);
}
/* scan a PCI bus tree reached through one PCI attachment point */
int
pci_probe(pciattach *parent)
{
int bushigh;
int bus = 0;
STAILQ_INIT(&pci_devq);
bushigh = pci_bushigh();
while (bus <= bushigh) {
int newbushigh;
printf("Probing for devices on PCI bus %d:\n", bus);
newbushigh = pci_probebus(bus);
if (bushigh < newbushigh)
bushigh = newbushigh;
bus++;
}
return (bushigh);
}
/*
* This is the user interface to PCI configuration space.
*/
static int
pci_open(dev_t dev, int oflags, int devtype, struct proc *p)
{
if ((oflags & FWRITE) && securelevel > 0) {
return EPERM;
}
return 0;
}
static int
pci_close(dev_t dev, int flag, int devtype, struct proc *p)
{
return 0;
}
/*
* Match a single pci_conf structure against an array of pci_match_conf
* structures. The first argument, 'matches', is an array of num_matches
* pci_match_conf structures. match_buf is a pointer to the pci_conf
* structure that will be compared to every entry in the matches array.
* This function returns 1 on failure, 0 on success.
*/
static int
pci_conf_match(struct pci_match_conf *matches, int num_matches,
struct pci_conf *match_buf)
{
int i;
if ((matches == NULL) || (match_buf == NULL) || (num_matches <= 0))
return(1);
for (i = 0; i < num_matches; i++) {
/*
* I'm not sure why someone would do this...but...
*/
if (matches[i].flags == PCI_GETCONF_NO_MATCH)
continue;
/*
* Look at each of the match flags. If it's set, do the
* comparison. If the comparison fails, we don't have a
* match, go on to the next item if there is one.
*/
if (((matches[i].flags & PCI_GETCONF_MATCH_BUS) != 0)
&& (match_buf->pc_sel.pc_bus != matches[i].pc_sel.pc_bus))
continue;
if (((matches[i].flags & PCI_GETCONF_MATCH_DEV) != 0)
&& (match_buf->pc_sel.pc_dev != matches[i].pc_sel.pc_dev))
continue;
if (((matches[i].flags & PCI_GETCONF_MATCH_FUNC) != 0)
&& (match_buf->pc_sel.pc_func != matches[i].pc_sel.pc_func))
continue;
if (((matches[i].flags & PCI_GETCONF_MATCH_VENDOR) != 0)
&& (match_buf->pc_vendor != matches[i].pc_vendor))
continue;
if (((matches[i].flags & PCI_GETCONF_MATCH_DEVICE) != 0)
&& (match_buf->pc_device != matches[i].pc_device))
continue;
if (((matches[i].flags & PCI_GETCONF_MATCH_CLASS) != 0)
&& (match_buf->pc_class != matches[i].pc_class))
continue;
if (((matches[i].flags & PCI_GETCONF_MATCH_UNIT) != 0)
&& (match_buf->pd_unit != matches[i].pd_unit))
continue;
if (((matches[i].flags & PCI_GETCONF_MATCH_NAME) != 0)
&& (strncmp(matches[i].pd_name, match_buf->pd_name,
sizeof(match_buf->pd_name)) != 0))
continue;
return(0);
}
return(1);
}
static int
pci_ioctl(dev_t dev, u_long cmd, caddr_t data, int flag, struct proc *p)
{
struct pci_io *io;
int error;
if (!(flag & FWRITE))
return EPERM;
switch(cmd) {
case PCIOCGETCONF:
{
struct pci_devinfo *dinfo;
struct pci_conf_io *cio;
struct devlist *devlist_head;
struct pci_match_conf *pattern_buf;
int num_patterns;
size_t iolen;
int ionum, i;
cio = (struct pci_conf_io *)data;
num_patterns = 0;
dinfo = NULL;
/*
* Hopefully the user won't pass in a null pointer, but it
* can't hurt to check.
*/
if (cio == NULL) {
error = EINVAL;
break;
}
/*
* If the user specified an offset into the device list,
* but the list has changed since they last called this
* ioctl, tell them that the list has changed. They will
* have to get the list from the beginning.
*/
if ((cio->offset != 0)
&& (cio->generation != pci_generation)){
cio->num_matches = 0;
cio->status = PCI_GETCONF_LIST_CHANGED;
error = 0;
break;
}
/*
* Check to see whether the user has asked for an offset
* past the end of our list.
*/
if (cio->offset >= pci_numdevs) {
cio->num_matches = 0;
cio->status = PCI_GETCONF_LAST_DEVICE;
error = 0;
break;
}
/* get the head of the device queue */
devlist_head = &pci_devq;
/*
* Determine how much room we have for pci_conf structures.
* Round the user's buffer size down to the nearest
* multiple of sizeof(struct pci_conf) in case the user
* didn't specify a multiple of that size.
*/
iolen = min(cio->match_buf_len -
(cio->match_buf_len % sizeof(struct pci_conf)),
pci_numdevs * sizeof(struct pci_conf));
/*
* Since we know that iolen is a multiple of the size of
* the pciconf union, it's okay to do this.
*/
ionum = iolen / sizeof(struct pci_conf);
/*
* If this test is true, the user wants the pci_conf
* structures returned to match the supplied entries.
*/
if ((cio->num_patterns > 0)
&& (cio->pat_buf_len > 0)) {
/*
* pat_buf_len needs to be:
* num_patterns * sizeof(struct pci_match_conf)
* While it is certainly possible the user just
* allocated a large buffer, but set the number of
* matches correctly, it is far more likely that
* their kernel doesn't match the userland utility
* they're using. It's also possible that the user
* forgot to initialize some variables. Yes, this
* may be overly picky, but I hazard to guess that
* it's far more likely to just catch folks that
* updated their kernel but not their userland.
*/
if ((cio->num_patterns *
sizeof(struct pci_match_conf)) != cio->pat_buf_len){
/* The user made a mistake, return an error*/
cio->status = PCI_GETCONF_ERROR;
printf("pci_ioctl: pat_buf_len %d != "
"num_patterns (%d) * sizeof(struct "
"pci_match_conf) (%d)\npci_ioctl: "
"pat_buf_len should be = %d\n",
cio->pat_buf_len, cio->num_patterns,
sizeof(struct pci_match_conf),
sizeof(struct pci_match_conf) *
cio->num_patterns);
printf("pci_ioctl: do your headers match your "
"kernel?\n");
cio->num_matches = 0;
error = EINVAL;
break;
}
/*
* Check the user's buffer to make sure it's readable.
*/
if ((error = useracc((caddr_t)cio->patterns,
cio->pat_buf_len, B_READ)) != 1){
printf("pci_ioctl: pattern buffer %#p, "
"length %u isn't user accessible for"
" READ\n", cio->patterns,
cio->pat_buf_len);
error = EACCES;
break;
}
/*
* Allocate a buffer to hold the patterns.
*/
pattern_buf = malloc(cio->pat_buf_len, M_TEMP,
M_WAITOK);
error = copyin(cio->patterns, pattern_buf,
cio->pat_buf_len);
if (error != 0)
break;
num_patterns = cio->num_patterns;
} else if ((cio->num_patterns > 0)
|| (cio->pat_buf_len > 0)) {
/*
* The user made a mistake, spit out an error.
*/
cio->status = PCI_GETCONF_ERROR;
cio->num_matches = 0;
printf("pci_ioctl: invalid GETCONF arguments\n");
error = EINVAL;
break;
} else
pattern_buf = NULL;
/*
* Make sure we can write to the match buffer.
*/
if ((error = useracc((caddr_t)cio->matches, cio->match_buf_len,
B_WRITE)) != 1) {
printf("pci_ioctl: match buffer %#p, length %u "
"isn't user accessible for WRITE\n",
cio->matches, cio->match_buf_len);
error = EACCES;
break;
}
/*
* Go through the list of devices and copy out the devices
* that match the user's criteria.
*/
for (cio->num_matches = 0, error = 0, i = 0,
dinfo = STAILQ_FIRST(devlist_head);
(dinfo != NULL) && (cio->num_matches < ionum)
&& (error == 0) && (i < pci_numdevs);
dinfo = STAILQ_NEXT(dinfo, pci_links), i++) {
if (i < cio->offset)
continue;
if ((pattern_buf == NULL) ||
(pci_conf_match(pattern_buf, num_patterns,
&dinfo->conf) == 0)) {
/*
* If we've filled up the user's buffer,
* break out at this point. Since we've
* got a match here, we'll pick right back
* up at the matching entry. We can also
* tell the user that there are more matches
* left.
*/
if (cio->num_matches >= ionum)
break;
error = copyout(&dinfo->conf,
&cio->matches[cio->num_matches],
sizeof(struct pci_conf));
cio->num_matches++;
}
}
/*
* Set the pointer into the list, so if the user is getting
* n records at a time, where n < pci_numdevs,
*/
cio->offset = i;
/*
* Set the generation, the user will need this if they make
* another ioctl call with offset != 0.
*/
cio->generation = pci_generation;
/*
* If this is the last device, inform the user so he won't
* bother asking for more devices. If dinfo isn't NULL, we
* know that there are more matches in the list because of
* the way the traversal is done.
*/
if (dinfo == NULL)
cio->status = PCI_GETCONF_LAST_DEVICE;
else
cio->status = PCI_GETCONF_MORE_DEVS;
if (pattern_buf != NULL)
free(pattern_buf, M_TEMP);
break;
}
case PCIOCREAD:
io = (struct pci_io *)data;
switch(io->pi_width) {
pcicfgregs probe;
case 4:
case 2:
case 1:
probe.bus = io->pi_sel.pc_bus;
probe.slot = io->pi_sel.pc_dev;
probe.func = io->pi_sel.pc_func;
io->pi_data = pci_cfgread(&probe,
io->pi_reg, io->pi_width);
error = 0;
break;
default:
error = ENODEV;
break;
}
break;
case PCIOCWRITE:
io = (struct pci_io *)data;
switch(io->pi_width) {
pcicfgregs probe;
case 4:
case 2:
case 1:
probe.bus = io->pi_sel.pc_bus;
probe.slot = io->pi_sel.pc_dev;
probe.func = io->pi_sel.pc_func;
pci_cfgwrite(&probe,
io->pi_reg, io->pi_data, io->pi_width);
error = 0;
break;
default:
error = ENODEV;
break;
}
break;
default:
error = ENOTTY;
break;
}
return (error);
}
#define PCI_CDEV 78
static struct cdevsw pcicdev = {
pci_open, pci_close, noread, nowrite, pci_ioctl, nostop, noreset,
nodevtotty, seltrue, nommap, nostrategy, "pci", 0, PCI_CDEV
};
#ifdef DEVFS
static void *pci_devfs_token;
#endif
static void
pci_cdevinit(void *dummy)
{
dev_t dev;
dev = makedev(PCI_CDEV, 0);
cdevsw_add(&dev, &pcicdev, NULL);
#ifdef DEVFS
pci_devfs_token = devfs_add_devswf(&pcicdev, 0, DV_CHR,
UID_ROOT, GID_WHEEL, 0644, "pci");
#endif
}
SYSINIT(pcidev, SI_SUB_DRIVERS, SI_ORDER_MIDDLE+PCI_CDEV, pci_cdevinit, NULL);
#endif /* NPCI > 0 */
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