pci.c

基于组件方式开发操作系统的OSKIT源代码

		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 */
}

/* 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 */