freebsd-skq/sys/compat/linux/linux_util.c
attilio 7ee4e910ce - For kernel compiled only with KDTRACE_HOOKS and not any lock debugging
option, unbreak the lock tracing release semantic by embedding
  calls to LOCKSTAT_PROFILE_RELEASE_LOCK() direclty in the inlined
  version of the releasing functions for mutex, rwlock and sxlock.
  Failing to do so skips the lockstat_probe_func invokation for
  unlocking.
- As part of the LOCKSTAT support is inlined in mutex operation, for
  kernel compiled without lock debugging options, potentially every
  consumer must be compiled including opt_kdtrace.h.
  Fix this by moving KDTRACE_HOOKS into opt_global.h and remove the
  dependency by opt_kdtrace.h for all files, as now only KDTRACE_FRAMES
  is linked there and it is only used as a compile-time stub [0].

[0] immediately shows some new bug as DTRACE-derived support for debug
in sfxge is broken and it was never really tested.  As it was not
including correctly opt_kdtrace.h before it was never enabled so it
was kept broken for a while.  Fix this by using a protection stub,
leaving sfxge driver authors the responsibility for fixing it
appropriately [1].

Sponsored by:	EMC / Isilon storage division
Discussed with:	rstone
[0] Reported by:	rstone
[1] Discussed with:	philip
2013-11-25 07:38:45 +00:00

333 lines
9.4 KiB
C

/*-
* Copyright (c) 1994 Christos Zoulas
* Copyright (c) 1995 Frank van der Linden
* Copyright (c) 1995 Scott Bartram
* 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, 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.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission
*
* 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.
*
* from: svr4_util.c,v 1.5 1995/01/22 23:44:50 christos Exp
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include "opt_compat.h"
#include <sys/param.h>
#include <sys/bus.h>
#include <sys/fcntl.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/kernel.h>
#include <sys/linker_set.h>
#include <sys/mutex.h>
#include <sys/namei.h>
#include <sys/proc.h>
#include <sys/sdt.h>
#include <sys/syscallsubr.h>
#include <sys/systm.h>
#include <sys/vnode.h>
#include <machine/stdarg.h>
#include <compat/linux/linux_util.h>
#ifdef COMPAT_LINUX32
#include <machine/../linux32/linux.h>
#else
#include <machine/../linux/linux.h>
#endif
#include <compat/linux/linux_dtrace.h>
const char linux_emul_path[] = "/compat/linux";
/* DTrace init */
LIN_SDT_PROVIDER_DECLARE(LINUX_DTRACE);
/**
* DTrace probes in this module.
*/
LIN_SDT_PROBE_DEFINE5(util, linux_emul_convpath, entry, "const char *",
"enum uio_seg", "char **", "int", "int");
LIN_SDT_PROBE_DEFINE1(util, linux_emul_convpath, return, "int");
LIN_SDT_PROBE_DEFINE1(util, linux_msg, entry, "const char *");
LIN_SDT_PROBE_DEFINE0(util, linux_msg, return);
LIN_SDT_PROBE_DEFINE2(util, linux_driver_get_name_dev, entry, "device_t",
"const char *");
LIN_SDT_PROBE_DEFINE0(util, linux_driver_get_name_dev, nullcall);
LIN_SDT_PROBE_DEFINE1(util, linux_driver_get_name_dev, return, "char *");
LIN_SDT_PROBE_DEFINE3(util, linux_driver_get_major_minor, entry, "char *",
"int *", "int *");
LIN_SDT_PROBE_DEFINE0(util, linux_driver_get_major_minor, nullcall);
LIN_SDT_PROBE_DEFINE1(util, linux_driver_get_major_minor, notfound, "char *");
LIN_SDT_PROBE_DEFINE3(util, linux_driver_get_major_minor, return, "int",
"int", "int");
LIN_SDT_PROBE_DEFINE0(util, linux_get_char_devices, entry);
LIN_SDT_PROBE_DEFINE1(util, linux_get_char_devices, return, "char *");
LIN_SDT_PROBE_DEFINE1(util, linux_free_get_char_devices, entry, "char *");
LIN_SDT_PROBE_DEFINE0(util, linux_free_get_char_devices, return);
LIN_SDT_PROBE_DEFINE1(util, linux_device_register_handler, entry,
"struct linux_device_handler *");
LIN_SDT_PROBE_DEFINE1(util, linux_device_register_handler, return, "int");
LIN_SDT_PROBE_DEFINE1(util, linux_device_unregister_handler, entry,
"struct linux_device_handler *");
LIN_SDT_PROBE_DEFINE1(util, linux_device_unregister_handler, return, "int");
/*
* Search an alternate path before passing pathname arguments on to
* system calls. Useful for keeping a separate 'emulation tree'.
*
* If cflag is set, we check if an attempt can be made to create the
* named file, i.e. we check if the directory it should be in exists.
*/
int
linux_emul_convpath(struct thread *td, const char *path, enum uio_seg pathseg,
char **pbuf, int cflag, int dfd)
{
int retval;
LIN_SDT_PROBE5(util, linux_emul_convpath, entry, path, pathseg, pbuf,
cflag, dfd);
retval = kern_alternate_path(td, linux_emul_path, path, pathseg, pbuf,
cflag, dfd);
LIN_SDT_PROBE1(util, linux_emul_convpath, return, retval);
return (retval);
}
void
linux_msg(const struct thread *td, const char *fmt, ...)
{
va_list ap;
struct proc *p;
LIN_SDT_PROBE1(util, linux_msg, entry, fmt);
p = td->td_proc;
printf("linux: pid %d (%s): ", (int)p->p_pid, p->p_comm);
va_start(ap, fmt);
vprintf(fmt, ap);
va_end(ap);
printf("\n");
LIN_SDT_PROBE0(util, linux_msg, return);
}
struct device_element
{
TAILQ_ENTRY(device_element) list;
struct linux_device_handler entry;
};
static TAILQ_HEAD(, device_element) devices =
TAILQ_HEAD_INITIALIZER(devices);
static struct linux_device_handler null_handler =
{ "mem", "mem", "null", "null", 1, 3, 1};
DATA_SET(linux_device_handler_set, null_handler);
char *
linux_driver_get_name_dev(device_t dev)
{
struct device_element *de;
const char *device_name = device_get_name(dev);
LIN_SDT_PROBE2(util, linux_driver_get_name_dev, entry, dev,
device_name);
if (device_name == NULL) {
LIN_SDT_PROBE0(util, linux_driver_get_name_dev, nullcall);
LIN_SDT_PROBE1(util, linux_driver_get_name_dev, return, NULL);
return NULL;
}
TAILQ_FOREACH(de, &devices, list) {
if (strcmp(device_name, de->entry.bsd_driver_name) == 0) {
LIN_SDT_PROBE1(util, linux_driver_get_name_dev, return,
de->entry.linux_driver_name);
return (de->entry.linux_driver_name);
}
}
LIN_SDT_PROBE1(util, linux_driver_get_name_dev, return, NULL);
return NULL;
}
int
linux_driver_get_major_minor(const char *node, int *major, int *minor)
{
struct device_element *de;
LIN_SDT_PROBE3(util, linux_driver_get_major_minor, entry, node, major,
minor);
if (node == NULL || major == NULL || minor == NULL) {
LIN_SDT_PROBE0(util, linux_driver_get_major_minor, nullcall);
LIN_SDT_PROBE3(util, linux_driver_get_major_minor, return, 1,
0, 0);
return 1;
}
if (strlen(node) > strlen("pts/") &&
strncmp(node, "pts/", strlen("pts/")) == 0) {
unsigned long devno;
/*
* Linux checks major and minors of the slave device
* to make sure it's a pty device, so let's make him
* believe it is.
*/
devno = strtoul(node + strlen("pts/"), NULL, 10);
*major = 136 + (devno / 256);
*minor = devno % 256;
LIN_SDT_PROBE3(util, linux_driver_get_major_minor, return, 0,
*major, *minor);
return 0;
}
TAILQ_FOREACH(de, &devices, list) {
if (strcmp(node, de->entry.bsd_device_name) == 0) {
*major = de->entry.linux_major;
*minor = de->entry.linux_minor;
LIN_SDT_PROBE3(util, linux_driver_get_major_minor,
return, 0, *major, *minor);
return 0;
}
}
LIN_SDT_PROBE1(util, linux_driver_get_major_minor, notfound, node);
LIN_SDT_PROBE3(util, linux_driver_get_major_minor, return, 1, 0, 0);
return 1;
}
char *
linux_get_char_devices()
{
struct device_element *de;
char *temp, *string, *last;
char formated[256];
int current_size = 0, string_size = 1024;
LIN_SDT_PROBE0(util, linux_get_char_devices, entry);
string = malloc(string_size, M_LINUX, M_WAITOK);
string[0] = '\000';
last = "";
TAILQ_FOREACH(de, &devices, list) {
if (!de->entry.linux_char_device)
continue;
temp = string;
if (strcmp(last, de->entry.bsd_driver_name) != 0) {
last = de->entry.bsd_driver_name;
snprintf(formated, sizeof(formated), "%3d %s\n",
de->entry.linux_major,
de->entry.linux_device_name);
if (strlen(formated) + current_size
>= string_size) {
string_size *= 2;
string = malloc(string_size,
M_LINUX, M_WAITOK);
bcopy(temp, string, current_size);
free(temp, M_LINUX);
}
strcat(string, formated);
current_size = strlen(string);
}
}
LIN_SDT_PROBE1(util, linux_get_char_devices, return, string);
return string;
}
void
linux_free_get_char_devices(char *string)
{
LIN_SDT_PROBE1(util, linux_get_char_devices, entry, string);
free(string, M_LINUX);
LIN_SDT_PROBE0(util, linux_get_char_devices, return);
}
static int linux_major_starting = 200;
int
linux_device_register_handler(struct linux_device_handler *d)
{
struct device_element *de;
LIN_SDT_PROBE1(util, linux_device_register_handler, entry, d);
if (d == NULL) {
LIN_SDT_PROBE1(util, linux_device_register_handler, return,
EINVAL);
return (EINVAL);
}
de = malloc(sizeof(*de), M_LINUX, M_WAITOK);
if (d->linux_major < 0) {
d->linux_major = linux_major_starting++;
}
bcopy(d, &de->entry, sizeof(*d));
/* Add the element to the list, sorted on span. */
TAILQ_INSERT_TAIL(&devices, de, list);
LIN_SDT_PROBE1(util, linux_device_register_handler, return, 0);
return (0);
}
int
linux_device_unregister_handler(struct linux_device_handler *d)
{
struct device_element *de;
LIN_SDT_PROBE1(util, linux_device_unregister_handler, entry, d);
if (d == NULL) {
LIN_SDT_PROBE1(util, linux_device_unregister_handler, return,
EINVAL);
return (EINVAL);
}
TAILQ_FOREACH(de, &devices, list) {
if (bcmp(d, &de->entry, sizeof(*d)) == 0) {
TAILQ_REMOVE(&devices, de, list);
free(de, M_LINUX);
LIN_SDT_PROBE1(util, linux_device_unregister_handler,
return, 0);
return (0);
}
}
LIN_SDT_PROBE1(util, linux_device_unregister_handler, return, EINVAL);
return (EINVAL);
}