freebsd-skq/sys/dev/pci/pci_user.c

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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.
*
* $FreeBSD$
*
*/
#include "opt_bus.h" /* XXX trim includes */
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/malloc.h>
#include <sys/module.h>
#include <sys/linker.h>
#include <sys/fcntl.h>
#include <sys/conf.h>
#include <sys/kernel.h>
#include <sys/proc.h>
#include <sys/queue.h>
#include <sys/types.h>
#include <vm/vm.h>
#include <vm/pmap.h>
#include <vm/vm_extern.h>
#include <sys/bus.h>
#include <machine/bus.h>
#include <sys/rman.h>
#include <machine/resource.h>
#include <sys/pciio.h>
#include <pci/pcireg.h>
#include <pci/pcivar.h>
#include "pcib_if.h"
#include "pci_if.h"
/*
* This is the user interface to PCI configuration space.
*/
static d_open_t pci_open;
static d_close_t pci_close;
static int pci_conf_match(struct pci_match_conf *matches, int num_matches,
struct pci_conf *match_buf);
static d_ioctl_t pci_ioctl;
#define PCI_CDEV 78
struct cdevsw pcicdev = {
/* open */ pci_open,
/* close */ pci_close,
/* read */ noread,
/* write */ nowrite,
/* ioctl */ pci_ioctl,
/* poll */ nopoll,
/* mmap */ nommap,
/* strategy */ nostrategy,
/* name */ "pci",
/* maj */ PCI_CDEV,
/* dump */ nodump,
/* psize */ nopsize,
/* flags */ 0,
};
static int
pci_open(dev_t dev, int oflags, int devtype, struct thread *td)
{
int error;
if (oflags & FWRITE) {
error = securelevel_gt(td->td_proc->p_ucred, 0);
if (error)
return (error);
}
return (0);
}
static int
pci_close(dev_t dev, int flag, int devtype, struct thread *td)
{
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 thread *td)
{
device_t pci, pcib;
struct pci_io *io;
const char *name;
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,
(int)sizeof(struct pci_match_conf),
(int)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 (!useracc((caddr_t)cio->patterns,
cio->pat_buf_len, VM_PROT_READ)) {
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 (!useracc((caddr_t)cio->matches,
cio->match_buf_len, VM_PROT_WRITE)) {
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;
/* Populate pd_name and pd_unit */
name = NULL;
if (dinfo->cfg.dev && dinfo->conf.pd_name[0] == '\0')
name = device_get_name(dinfo->cfg.dev);
if (name) {
strncpy(dinfo->conf.pd_name, name,
sizeof(dinfo->conf.pd_name));
dinfo->conf.pd_name[PCI_MAXNAMELEN] = 0;
dinfo->conf.pd_unit =
device_get_unit(dinfo->cfg.dev);
}
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) {
case 4:
case 2:
case 1:
/*
* Assume that the user-level bus number is
* actually the pciN instance number. We map
* from that to the real pcib+bus combination.
*/
pci = devclass_get_device(devclass_find("pci"),
io->pi_sel.pc_bus);
if (pci) {
int b = pcib_get_bus(pci);
pcib = device_get_parent(pci);
io->pi_data =
PCIB_READ_CONFIG(pcib,
b,
io->pi_sel.pc_dev,
io->pi_sel.pc_func,
io->pi_reg,
io->pi_width);
error = 0;
} else {
error = ENODEV;
}
break;
default:
error = ENODEV;
break;
}
break;
case PCIOCWRITE:
io = (struct pci_io *)data;
switch(io->pi_width) {
case 4:
case 2:
case 1:
/*
* Assume that the user-level bus number is
* actually the pciN instance number. We map
* from that to the real pcib+bus combination.
*/
pci = devclass_get_device(devclass_find("pci"),
io->pi_sel.pc_bus);
if (pci) {
int b = pcib_get_bus(pci);
pcib = device_get_parent(pci);
PCIB_WRITE_CONFIG(pcib,
b,
io->pi_sel.pc_dev,
io->pi_sel.pc_func,
io->pi_reg,
io->pi_data,
io->pi_width);
error = 0;
} else {
error = ENODEV;
}
break;
default:
error = ENODEV;
break;
}
break;
default:
error = ENOTTY;
break;
}
return (error);
}