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Implement "-p dev" to print the path to the given device back to the

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nexus. With redirection, could also be used to test if the device
exists in the device tree.

Sponsored by: Netflix
This commit is contained in:
Warner Losh 2017-12-21 18:51:47 +00:00
parent 9e33a61693
commit 3386009737
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=327066
2 changed files with 48 additions and 7 deletions
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4
usr.sbin/devinfo/devinfo.8
View File

@ -38,6 +38,8 @@
.Op Fl rv
.Nm
.Fl u
.Nm
.Fl p dev
.Sh DESCRIPTION
The
.Nm
@ -62,6 +64,8 @@ the IRQ consumers together.
Display all devices in the driver tree, not just those that are attached or
busy.
Without this flag, only those devices that have attached are reported.
.It Fl p dev
Display the path of dev back to the root of the device tree.
.El
.Sh SEE ALSO
.Xr systat 1 ,

51
usr.sbin/devinfo/devinfo.c
View File

@ -38,6 +38,7 @@ __FBSDID("$FreeBSD$");
#include <err.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "devinfo.h"
@ -196,15 +197,47 @@ print_rman(struct devinfo_rman *rman, void *arg __unused)
return(0);
}
static void __dead2
usage(void)
{
fprintf(stderr, "%s\n%s\n%s\n",
"usage: devinfo [-rv]",
" devinfo -u",
" devifno -p dev");
exit(1);
}
static int
print_path(struct devinfo_dev *dev, void *xname)
{
const char *name = xname;
int rv;
if (strcmp(dev->dd_name, name) == 0) {
printf("%s", dev->dd_name);
return (1);
}
rv = devinfo_foreach_device_child(dev, print_path, xname);
if (rv == 1)
printf(" %s", dev->dd_name[0] ? dev->dd_name : "unknown");
return (rv);
}
int
main(int argc, char *argv[])
{
struct devinfo_dev *root;
int c, uflag;
char *path;
uflag = 0;
while ((c = getopt(argc, argv, "ruv")) != -1) {
while ((c = getopt(argc, argv, "p:ruv")) != -1) {
switch(c) {
case 'p':
path = optarg;
break;
case 'r':
rflag++;
break;
@ -215,21 +248,25 @@ main(int argc, char *argv[])
vflag++;
break;
default:
fprintf(stderr, "%s\n%s\n",
"usage: devinfo [-rv]",
" devinfo -u");
exit(1);
usage();
}
}
if (path && (rflag || uflag))
usage();
if (devinfo_init())
err(1, "devinfo_init");
if ((root = devinfo_handle_to_device(DEVINFO_ROOT_DEVICE)) == NULL)
errx(1, "can't find root device");
/* print resource usage? */
if (uflag) {
if (path) {
if (devinfo_foreach_device_child(root, print_path, (void *)path) == 0)
errx(1, "%s: Not found", path);
printf("\n");
} else if (uflag) {
/* print resource usage? */
devinfo_foreach_rman(print_rman, NULL);
} else {
/* print device hierarchy */