487 lines
13 KiB
C
487 lines
13 KiB
C
/*
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* Copyright (c) 1997, Stefan Esser <se@freebsd.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice unmodified, this list of conditions, and the following
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* disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $FreeBSD$
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*
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*/
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#include "opt_bus.h" /* XXX trim includes */
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/malloc.h>
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#include <sys/module.h>
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#include <sys/linker.h>
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#include <sys/fcntl.h>
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#include <sys/conf.h>
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#include <sys/kernel.h>
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#include <sys/queue.h>
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#include <sys/types.h>
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#include <vm/vm.h>
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#include <vm/pmap.h>
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#include <vm/vm_extern.h>
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#include <sys/bus.h>
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#include <machine/bus.h>
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#include <sys/rman.h>
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#include <machine/resource.h>
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#include <sys/pciio.h>
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#include <pci/pcireg.h>
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#include <pci/pcivar.h>
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#include "pcib_if.h"
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#include "pci_if.h"
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/*
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* This is the user interface to PCI configuration space.
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*/
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static int pci_open(dev_t dev, int oflags, int devtype, struct proc *p);
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static int pci_close(dev_t dev, int flag, int devtype, struct proc *p);
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static int pci_conf_match(struct pci_match_conf *matches, int num_matches,
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struct pci_conf *match_buf);
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static int pci_ioctl(dev_t dev, u_long cmd, caddr_t data, int flag, struct proc *p);
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#define PCI_CDEV 78
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struct cdevsw pcicdev = {
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/* open */ pci_open,
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/* close */ pci_close,
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/* read */ noread,
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/* write */ nowrite,
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/* ioctl */ pci_ioctl,
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/* poll */ nopoll,
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/* mmap */ nommap,
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/* strategy */ nostrategy,
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/* name */ "pci",
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/* maj */ PCI_CDEV,
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/* dump */ nodump,
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/* psize */ nopsize,
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/* flags */ 0,
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};
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static int
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pci_open(dev_t dev, int oflags, int devtype, struct proc *p)
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{
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if ((oflags & FWRITE) && securelevel > 0) {
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return EPERM;
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}
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return 0;
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}
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static int
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pci_close(dev_t dev, int flag, int devtype, struct proc *p)
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{
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return 0;
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}
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/*
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* Match a single pci_conf structure against an array of pci_match_conf
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* structures. The first argument, 'matches', is an array of num_matches
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* pci_match_conf structures. match_buf is a pointer to the pci_conf
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* structure that will be compared to every entry in the matches array.
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* This function returns 1 on failure, 0 on success.
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*/
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static int
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pci_conf_match(struct pci_match_conf *matches, int num_matches,
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struct pci_conf *match_buf)
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{
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int i;
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if ((matches == NULL) || (match_buf == NULL) || (num_matches <= 0))
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return(1);
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for (i = 0; i < num_matches; i++) {
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/*
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* I'm not sure why someone would do this...but...
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*/
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if (matches[i].flags == PCI_GETCONF_NO_MATCH)
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continue;
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/*
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* Look at each of the match flags. If it's set, do the
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* comparison. If the comparison fails, we don't have a
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* match, go on to the next item if there is one.
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*/
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if (((matches[i].flags & PCI_GETCONF_MATCH_BUS) != 0)
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&& (match_buf->pc_sel.pc_bus != matches[i].pc_sel.pc_bus))
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continue;
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if (((matches[i].flags & PCI_GETCONF_MATCH_DEV) != 0)
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&& (match_buf->pc_sel.pc_dev != matches[i].pc_sel.pc_dev))
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continue;
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if (((matches[i].flags & PCI_GETCONF_MATCH_FUNC) != 0)
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&& (match_buf->pc_sel.pc_func != matches[i].pc_sel.pc_func))
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continue;
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if (((matches[i].flags & PCI_GETCONF_MATCH_VENDOR) != 0)
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&& (match_buf->pc_vendor != matches[i].pc_vendor))
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continue;
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if (((matches[i].flags & PCI_GETCONF_MATCH_DEVICE) != 0)
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&& (match_buf->pc_device != matches[i].pc_device))
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continue;
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if (((matches[i].flags & PCI_GETCONF_MATCH_CLASS) != 0)
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&& (match_buf->pc_class != matches[i].pc_class))
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continue;
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if (((matches[i].flags & PCI_GETCONF_MATCH_UNIT) != 0)
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&& (match_buf->pd_unit != matches[i].pd_unit))
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continue;
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if (((matches[i].flags & PCI_GETCONF_MATCH_NAME) != 0)
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&& (strncmp(matches[i].pd_name, match_buf->pd_name,
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sizeof(match_buf->pd_name)) != 0))
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continue;
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return(0);
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}
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return(1);
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}
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static int
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pci_ioctl(dev_t dev, u_long cmd, caddr_t data, int flag, struct proc *p)
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{
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device_t pci, pcib;
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struct pci_io *io;
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const char *name;
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int error;
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if (!(flag & FWRITE))
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return EPERM;
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switch(cmd) {
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case PCIOCGETCONF:
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{
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struct pci_devinfo *dinfo;
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struct pci_conf_io *cio;
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struct devlist *devlist_head;
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struct pci_match_conf *pattern_buf;
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int num_patterns;
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size_t iolen;
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int ionum, i;
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cio = (struct pci_conf_io *)data;
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num_patterns = 0;
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dinfo = NULL;
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/*
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* Hopefully the user won't pass in a null pointer, but it
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* can't hurt to check.
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*/
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if (cio == NULL) {
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error = EINVAL;
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break;
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}
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/*
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* If the user specified an offset into the device list,
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* but the list has changed since they last called this
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* ioctl, tell them that the list has changed. They will
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* have to get the list from the beginning.
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*/
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if ((cio->offset != 0)
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&& (cio->generation != pci_generation)){
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cio->num_matches = 0;
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cio->status = PCI_GETCONF_LIST_CHANGED;
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error = 0;
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break;
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}
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/*
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* Check to see whether the user has asked for an offset
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* past the end of our list.
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*/
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if (cio->offset >= pci_numdevs) {
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cio->num_matches = 0;
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cio->status = PCI_GETCONF_LAST_DEVICE;
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error = 0;
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break;
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}
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/* get the head of the device queue */
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devlist_head = &pci_devq;
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/*
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* Determine how much room we have for pci_conf structures.
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* Round the user's buffer size down to the nearest
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* multiple of sizeof(struct pci_conf) in case the user
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* didn't specify a multiple of that size.
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*/
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iolen = min(cio->match_buf_len -
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(cio->match_buf_len % sizeof(struct pci_conf)),
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pci_numdevs * sizeof(struct pci_conf));
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/*
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* Since we know that iolen is a multiple of the size of
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* the pciconf union, it's okay to do this.
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*/
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ionum = iolen / sizeof(struct pci_conf);
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/*
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* If this test is true, the user wants the pci_conf
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* structures returned to match the supplied entries.
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*/
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if ((cio->num_patterns > 0)
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&& (cio->pat_buf_len > 0)) {
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/*
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* pat_buf_len needs to be:
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* num_patterns * sizeof(struct pci_match_conf)
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* While it is certainly possible the user just
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* allocated a large buffer, but set the number of
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* matches correctly, it is far more likely that
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* their kernel doesn't match the userland utility
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* they're using. It's also possible that the user
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* forgot to initialize some variables. Yes, this
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* may be overly picky, but I hazard to guess that
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* it's far more likely to just catch folks that
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* updated their kernel but not their userland.
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*/
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if ((cio->num_patterns *
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sizeof(struct pci_match_conf)) != cio->pat_buf_len){
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/* The user made a mistake, return an error*/
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cio->status = PCI_GETCONF_ERROR;
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printf("pci_ioctl: pat_buf_len %d != "
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"num_patterns (%d) * sizeof(struct "
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"pci_match_conf) (%d)\npci_ioctl: "
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"pat_buf_len should be = %d\n",
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cio->pat_buf_len, cio->num_patterns,
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(int)sizeof(struct pci_match_conf),
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(int)sizeof(struct pci_match_conf) *
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cio->num_patterns);
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printf("pci_ioctl: do your headers match your "
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"kernel?\n");
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cio->num_matches = 0;
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error = EINVAL;
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break;
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}
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/*
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* Check the user's buffer to make sure it's readable.
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*/
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if (!useracc((caddr_t)cio->patterns,
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cio->pat_buf_len, VM_PROT_READ)) {
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printf("pci_ioctl: pattern buffer %p, "
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"length %u isn't user accessible for"
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" READ\n", cio->patterns,
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cio->pat_buf_len);
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error = EACCES;
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break;
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}
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/*
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* Allocate a buffer to hold the patterns.
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*/
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pattern_buf = malloc(cio->pat_buf_len, M_TEMP,
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M_WAITOK);
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error = copyin(cio->patterns, pattern_buf,
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cio->pat_buf_len);
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if (error != 0)
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break;
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num_patterns = cio->num_patterns;
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} else if ((cio->num_patterns > 0)
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|| (cio->pat_buf_len > 0)) {
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/*
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* The user made a mistake, spit out an error.
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*/
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cio->status = PCI_GETCONF_ERROR;
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cio->num_matches = 0;
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printf("pci_ioctl: invalid GETCONF arguments\n");
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error = EINVAL;
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break;
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} else
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pattern_buf = NULL;
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/*
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* Make sure we can write to the match buffer.
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*/
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if (!useracc((caddr_t)cio->matches,
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cio->match_buf_len, VM_PROT_WRITE)) {
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printf("pci_ioctl: match buffer %p, length %u "
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"isn't user accessible for WRITE\n",
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cio->matches, cio->match_buf_len);
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error = EACCES;
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break;
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}
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/*
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* Go through the list of devices and copy out the devices
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* that match the user's criteria.
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*/
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for (cio->num_matches = 0, error = 0, i = 0,
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dinfo = STAILQ_FIRST(devlist_head);
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(dinfo != NULL) && (cio->num_matches < ionum)
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&& (error == 0) && (i < pci_numdevs);
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dinfo = STAILQ_NEXT(dinfo, pci_links), i++) {
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if (i < cio->offset)
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continue;
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/* Populate pd_name and pd_unit */
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name = NULL;
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if (dinfo->cfg.dev && dinfo->conf.pd_name[0] == '\0')
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name = device_get_name(dinfo->cfg.dev);
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if (name) {
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strncpy(dinfo->conf.pd_name, name,
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sizeof(dinfo->conf.pd_name));
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dinfo->conf.pd_name[PCI_MAXNAMELEN] = 0;
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dinfo->conf.pd_unit =
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device_get_unit(dinfo->cfg.dev);
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}
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if ((pattern_buf == NULL) ||
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(pci_conf_match(pattern_buf, num_patterns,
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&dinfo->conf) == 0)) {
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/*
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* If we've filled up the user's buffer,
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* break out at this point. Since we've
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* got a match here, we'll pick right back
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* up at the matching entry. We can also
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* tell the user that there are more matches
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* left.
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*/
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if (cio->num_matches >= ionum)
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break;
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error = copyout(&dinfo->conf,
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&cio->matches[cio->num_matches],
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sizeof(struct pci_conf));
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cio->num_matches++;
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}
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}
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/*
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* Set the pointer into the list, so if the user is getting
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* n records at a time, where n < pci_numdevs,
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*/
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cio->offset = i;
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/*
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* Set the generation, the user will need this if they make
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* another ioctl call with offset != 0.
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*/
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cio->generation = pci_generation;
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/*
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* If this is the last device, inform the user so he won't
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* bother asking for more devices. If dinfo isn't NULL, we
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* know that there are more matches in the list because of
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* the way the traversal is done.
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*/
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if (dinfo == NULL)
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cio->status = PCI_GETCONF_LAST_DEVICE;
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else
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cio->status = PCI_GETCONF_MORE_DEVS;
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if (pattern_buf != NULL)
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free(pattern_buf, M_TEMP);
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break;
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}
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case PCIOCREAD:
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io = (struct pci_io *)data;
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switch(io->pi_width) {
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case 4:
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case 2:
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case 1:
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/*
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* Assume that the user-level bus number is
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* actually the pciN instance number. We map
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* from that to the real pcib+bus combination.
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*/
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pci = devclass_get_device(devclass_find("pci"),
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io->pi_sel.pc_bus);
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if (pci) {
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int b = pcib_get_bus(pci);
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pcib = device_get_parent(pci);
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io->pi_data =
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PCIB_READ_CONFIG(pcib,
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b,
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io->pi_sel.pc_dev,
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io->pi_sel.pc_func,
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io->pi_reg,
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io->pi_width);
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error = 0;
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} else {
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error = ENODEV;
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}
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break;
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default:
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error = ENODEV;
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break;
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}
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break;
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case PCIOCWRITE:
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io = (struct pci_io *)data;
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switch(io->pi_width) {
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case 4:
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case 2:
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case 1:
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/*
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* Assume that the user-level bus number is
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* actually the pciN instance number. We map
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* from that to the real pcib+bus combination.
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*/
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pci = devclass_get_device(devclass_find("pci"),
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io->pi_sel.pc_bus);
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if (pci) {
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int b = pcib_get_bus(pci);
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pcib = device_get_parent(pci);
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PCIB_WRITE_CONFIG(pcib,
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b,
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io->pi_sel.pc_dev,
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io->pi_sel.pc_func,
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io->pi_reg,
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io->pi_data,
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io->pi_width);
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error = 0;
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} else {
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error = ENODEV;
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}
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break;
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default:
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error = ENODEV;
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break;
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}
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break;
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default:
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error = ENOTTY;
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break;
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}
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return (error);
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}
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