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[PATCH] uml: move libc-dependent irq code to os-Linux 

The serial UML OS-abstraction layer patch (um/kernel dir).

This moves all systemcalls from irq_user.c file under os-Linux dir

Signed-off-by: Gennady Sharapov <Gennady.V.Sharapov@intel.com>
Signed-off-by: Jeff Dike <jdike@addtoit.com>
Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Jeff Dike 2006-03-27 01:14:30 -08:00 committed by Linus Torvalds
parent d9f8b62a6b
commit 63ae2a94d9
10 changed files with 290 additions and 163 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
arch/um/include/irq_user.h
View File

@ -6,6 +6,17 @@
#ifndef __IRQ_USER_H__
#define __IRQ_USER_H__
struct irq_fd {
struct irq_fd *next;
void *id;
int fd;
int type;
int irq;
int pid;
int events;
int current_events;
};
enum { IRQ_READ, IRQ_WRITE };
extern void sigio_handler(int sig, union uml_pt_regs *regs);
@ -16,8 +27,6 @@ extern void reactivate_fd(int fd, int irqnum);
extern void deactivate_fd(int fd, int irqnum);
extern int deactivate_all_fds(void);
extern void forward_interrupts(int pid);
extern void init_irq_signals(int on_sigstack);
extern void forward_ipi(int fd, int pid);
extern int activate_ipi(int fd, int pid);
extern unsigned long irq_lock(void);
extern void irq_unlock(unsigned long flags);

6
arch/um/include/misc_constants.h Normal file
View File

@ -0,0 +1,6 @@
#ifndef __MISC_CONSTANT_H_
#define __MISC_CONSTANT_H_
#include <user_constants.h>
#endif

16
arch/um/include/os.h
View File

@ -12,6 +12,7 @@
#include "sysdep/ptrace.h"
#include "kern_util.h"
#include "skas/mm_id.h"
#include "irq_user.h"
#define OS_TYPE_FILE 1
#define OS_TYPE_DIR 2
@ -198,6 +199,8 @@ extern void os_flush_stdout(void);
/* tt.c
* for tt mode only (will be deleted in future...)
*/
extern void forward_ipi(int fd, int pid);
extern void kill_child_dead(int pid);
extern void stop(void);
extern int wait_for_stop(int pid, int sig, int cont_type, void *relay);
extern int protect_memory(unsigned long addr, unsigned long len,
@ -294,4 +297,17 @@ extern void initial_thread_cb_skas(void (*proc)(void *),
extern void halt_skas(void);
extern void reboot_skas(void);
/* irq.c */
extern int os_waiting_for_events(struct irq_fd *active_fds);
extern int os_isatty(int fd);
extern int os_create_pollfd(int fd, int events, void *tmp_pfd, int size_tmpfds);
extern void os_free_irq_by_cb(int (*test)(struct irq_fd *, void *), void *arg,
struct irq_fd *active_fds, struct irq_fd ***last_irq_ptr2);
extern void os_free_irq_later(struct irq_fd *active_fds,
int irq, void *dev_id);
extern int os_get_pollfd(int i);
extern void os_set_pollfd(int i, int fd);
extern void os_set_ioignore(void);
extern void init_irq_signals(int on_sigstack);
#endif

196
arch/um/kernel/irq_user.c
View File

@ -18,52 +18,24 @@
#include "sigio.h"
#include "irq_user.h"
#include "os.h"
#include "misc_constants.h"
struct irq_fd {
struct irq_fd *next;
void *id;
int fd;
int type;
int irq;
int pid;
int events;
int current_events;
};
static struct irq_fd *active_fds = NULL;
struct irq_fd *active_fds = NULL;
static struct irq_fd **last_irq_ptr = &active_fds;
static struct pollfd *pollfds = NULL;
static int pollfds_num = 0;
static int pollfds_size = 0;
extern int io_count, intr_count;
extern void free_irqs(void);
void sigio_handler(int sig, union uml_pt_regs *regs)
{
struct irq_fd *irq_fd;
int i, n;
int n;
if(smp_sigio_handler()) return;
while(1){
n = poll(pollfds, pollfds_num, 0);
if(n < 0){
if(errno == EINTR) continue;
printk("sigio_handler : poll returned %d, "
"errno = %d\n", n, errno);
break;
}
if(n == 0) break;
irq_fd = active_fds;
for(i = 0; i < pollfds_num; i++){
if(pollfds[i].revents != 0){
irq_fd->current_events = pollfds[i].revents;
pollfds[i].fd = -1;
}
irq_fd = irq_fd->next;
n = os_waiting_for_events(active_fds);
if (n <= 0) {
if(n == -EINTR) continue;
else break;
}
for(irq_fd = active_fds; irq_fd != NULL; irq_fd = irq_fd->next){
@ -77,14 +49,9 @@ void sigio_handler(int sig, union uml_pt_regs *regs)
free_irqs();
}
int activate_ipi(int fd, int pid)
{
return(os_set_fd_async(fd, pid));
}
static void maybe_sigio_broken(int fd, int type)
{
if(isatty(fd)){
if(os_isatty(fd)){
if((type == IRQ_WRITE) && !pty_output_sigio){
write_sigio_workaround();
add_sigio_fd(fd, 0);
@ -96,12 +63,13 @@ static void maybe_sigio_broken(int fd, int type)
}
}
int activate_fd(int irq, int fd, int type, void *dev_id)
{
struct pollfd *tmp_pfd;
struct irq_fd *new_fd, *irq_fd;
unsigned long flags;
int pid, events, err, n, size;
int pid, events, err, n;
pid = os_getpid();
err = os_set_fd_async(fd, pid);
@ -113,8 +81,8 @@ int activate_fd(int irq, int fd, int type, void *dev_id)
if(new_fd == NULL)
goto out;
if(type == IRQ_READ) events = POLLIN | POLLPRI;
else events = POLLOUT;
if(type == IRQ_READ) events = UM_POLLIN | UM_POLLPRI;
else events = UM_POLLOUT;
*new_fd = ((struct irq_fd) { .next = NULL,
.id = dev_id,
.fd = fd,
@ -147,40 +115,42 @@ int activate_fd(int irq, int fd, int type, void *dev_id)
}
}
n = pollfds_num;
if(n == pollfds_size){
while(1){
/* Here we have to drop the lock in order to call
* kmalloc, which might sleep. If something else
* came in and changed the pollfds array, we free
* the buffer and try again.
*/
irq_unlock(flags);
size = (pollfds_num + 1) * sizeof(pollfds[0]);
tmp_pfd = um_kmalloc(size);
flags = irq_lock();
if(tmp_pfd == NULL)
goto out_unlock;
if(n == pollfds_size)
break;
kfree(tmp_pfd);
}
if(pollfds != NULL){
memcpy(tmp_pfd, pollfds,
sizeof(pollfds[0]) * pollfds_size);
kfree(pollfds);
}
pollfds = tmp_pfd;
pollfds_size++;
}
/*-------------*/
if(type == IRQ_WRITE)
fd = -1;
pollfds[pollfds_num] = ((struct pollfd) { .fd = fd,
.events = events,
.revents = 0 });
pollfds_num++;
tmp_pfd = NULL;
n = 0;
while(1){
n = os_create_pollfd(fd, events, tmp_pfd, n);
if (n == 0)
break;
/* n > 0
* It means we couldn't put new pollfd to current pollfds
* and tmp_fds is NULL or too small for new pollfds array.
* Needed size is equal to n as minimum.
*
* Here we have to drop the lock in order to call
* kmalloc, which might sleep.
* If something else came in and changed the pollfds array
* so we will not be able to put new pollfd struct to pollfds
* then we free the buffer tmp_fds and try again.
*/
irq_unlock(flags);
if (tmp_pfd != NULL) {
kfree(tmp_pfd);
tmp_pfd = NULL;
}
tmp_pfd = um_kmalloc(n);
if (tmp_pfd == NULL)
goto out_kfree;
flags = irq_lock();
}
/*-------------*/
*last_irq_ptr = new_fd;
last_irq_ptr = &new_fd->next;
@ -196,6 +166,7 @@ int activate_fd(int irq, int fd, int type, void *dev_id)
out_unlock:
irq_unlock(flags);
out_kfree:
kfree(new_fd);
out:
return(err);
@ -203,43 +174,10 @@ int activate_fd(int irq, int fd, int type, void *dev_id)
static void free_irq_by_cb(int (*test)(struct irq_fd *, void *), void *arg)
{
struct irq_fd **prev;
unsigned long flags;
int i = 0;
flags = irq_lock();
prev = &active_fds;
while(*prev != NULL){
if((*test)(*prev, arg)){
struct irq_fd *old_fd = *prev;
if((pollfds[i].fd != -1) &&
(pollfds[i].fd != (*prev)->fd)){
printk("free_irq_by_cb - mismatch between "
"active_fds and pollfds, fd %d vs %d\n",
(*prev)->fd, pollfds[i].fd);
goto out;
}
pollfds_num--;
/* This moves the *whole* array after pollfds[i] (though
* it doesn't spot as such)! */
memmove(&pollfds[i], &pollfds[i + 1],
(pollfds_num - i) * sizeof(pollfds[0]));
if(last_irq_ptr == &old_fd->next)
last_irq_ptr = prev;
*prev = (*prev)->next;
if(old_fd->type == IRQ_WRITE)
ignore_sigio_fd(old_fd->fd);
kfree(old_fd);
continue;
}
prev = &(*prev)->next;
i++;
}
out:
os_free_irq_by_cb(test, arg, active_fds, &last_irq_ptr);
irq_unlock(flags);
}
@ -277,6 +215,7 @@ static struct irq_fd *find_irq_by_fd(int fd, int irqnum, int *index_out)
{
struct irq_fd *irq;
int i = 0;
int fdi;
for(irq=active_fds; irq != NULL; irq = irq->next){
if((irq->fd == fd) && (irq->irq == irqnum)) break;
@ -286,10 +225,11 @@ static struct irq_fd *find_irq_by_fd(int fd, int irqnum, int *index_out)
printk("find_irq_by_fd doesn't have descriptor %d\n", fd);
goto out;
}
if((pollfds[i].fd != -1) && (pollfds[i].fd != fd)){
fdi = os_get_pollfd(i);
if((fdi != -1) && (fdi != fd)){
printk("find_irq_by_fd - mismatch between active_fds and "
"pollfds, fd %d vs %d, need %d\n", irq->fd,
pollfds[i].fd, fd);
fdi, fd);
irq = NULL;
goto out;
}
@ -310,9 +250,7 @@ void reactivate_fd(int fd, int irqnum)
irq_unlock(flags);
return;
}
pollfds[i].fd = irq->fd;
os_set_pollfd(i, irq->fd);
irq_unlock(flags);
/* This calls activate_fd, so it has to be outside the critical
@ -331,7 +269,7 @@ void deactivate_fd(int fd, int irqnum)
irq = find_irq_by_fd(fd, irqnum, &i);
if(irq == NULL)
goto out;
pollfds[i].fd = -1;
os_set_pollfd(i, -1);
out:
irq_unlock(flags);
}
@ -347,21 +285,11 @@ int deactivate_all_fds(void)
return(err);
}
/* If there is a signal already queued, after unblocking ignore it */
set_handler(SIGIO, SIG_IGN, 0, -1);
os_set_ioignore();
return(0);
}
void forward_ipi(int fd, int pid)
{
int err;
err = os_set_owner(fd, pid);
if(err < 0)
printk("forward_ipi: set_owner failed, fd = %d, me = %d, "
"target = %d, err = %d\n", fd, os_getpid(), pid, -err);
}
void forward_interrupts(int pid)
{
struct irq_fd *irq;
@ -384,22 +312,6 @@ void forward_interrupts(int pid)
irq_unlock(flags);
}
void init_irq_signals(int on_sigstack)
{
__sighandler_t h;
int flags;
flags = on_sigstack ? SA_ONSTACK : 0;
if(timer_irq_inited) h = (__sighandler_t) alarm_handler;
else h = boot_timer_handler;
set_handler(SIGVTALRM, h, flags | SA_RESTART,
SIGUSR1, SIGIO, SIGWINCH, SIGALRM, -1);
set_handler(SIGIO, (__sighandler_t) sig_handler, flags | SA_RESTART,
SIGUSR1, SIGIO, SIGWINCH, SIGALRM, SIGVTALRM, -1);
signal(SIGWINCH, SIG_IGN);
}
/*
* Overrides for Emacs so that we follow Linus's tabbing style.
* Emacs will notice this stuff at the end of the file and automatically

4
arch/um/kernel/smp.c
View File

@ -77,7 +77,7 @@ static int idle_proc(void *cpup)
if(err < 0)
panic("CPU#%d failed to create IPI pipe, err = %d", cpu, -err);
activate_ipi(cpu_data[cpu].ipi_pipe[0],
os_set_fd_async(cpu_data[cpu].ipi_pipe[0],
current->thread.mode.tt.extern_pid);
wmb();
@ -134,7 +134,7 @@ void smp_prepare_cpus(unsigned int maxcpus)
if(err < 0)
panic("CPU#0 failed to create IPI pipe, errno = %d", -err);
activate_ipi(cpu_data[me].ipi_pipe[0],
os_set_fd_async(cpu_data[me].ipi_pipe[0],
current->thread.mode.tt.extern_pid);
for(cpu = 1; cpu < ncpus; cpu++){

6
arch/um/os-Linux/Makefile
View File

@ -3,14 +3,14 @@
# Licensed under the GPL
#
obj-y = aio.o elf_aux.o file.o helper.o main.o mem.o process.o signal.o \
obj-y = aio.o elf_aux.o file.o helper.o irq.o main.o mem.o process.o signal.o \
start_up.o time.o trap.o tt.o tty.o uaccess.o umid.o user_syms.o \
util.o drivers/ sys-$(SUBARCH)/
obj-$(CONFIG_MODE_SKAS) += skas/
USER_OBJS := aio.o elf_aux.o file.o helper.o main.o mem.o process.o signal.o \
start_up.o time.o trap.o tt.o tty.o uaccess.o umid.o util.o
USER_OBJS := aio.o elf_aux.o file.o helper.o irq.o main.o mem.o process.o \
signal.o start_up.o time.o trap.o tt.o tty.o uaccess.o umid.o util.o
elf_aux.o: $(ARCH_DIR)/kernel-offsets.h
CFLAGS_elf_aux.o += -I$(objtree)/arch/um

162
arch/um/os-Linux/irq.c Normal file
View File

@ -0,0 +1,162 @@
/*
* Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com)
* Licensed under the GPL
*/
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <signal.h>
#include <string.h>
#include <sys/poll.h>
#include <sys/types.h>
#include <sys/time.h>
#include "user_util.h"
#include "kern_util.h"
#include "user.h"
#include "process.h"
#include "sigio.h"
#include "irq_user.h"
#include "os.h"
static struct pollfd *pollfds = NULL;
static int pollfds_num = 0;
static int pollfds_size = 0;
int os_waiting_for_events(struct irq_fd *active_fds)
{
struct irq_fd *irq_fd;
int i, n, err;
n = poll(pollfds, pollfds_num, 0);
if(n < 0){
err = -errno;
if(errno != EINTR)
printk("sigio_handler: os_waiting_for_events:"
" poll returned %d, errno = %d\n", n, errno);
return err;
}
if(n == 0)
return 0;
irq_fd = active_fds;
for(i = 0; i < pollfds_num; i++){
if(pollfds[i].revents != 0){
irq_fd->current_events = pollfds[i].revents;
pollfds[i].fd = -1;
}
irq_fd = irq_fd->next;
}
return n;
}
int os_isatty(int fd)
{
return(isatty(fd));
}
int os_create_pollfd(int fd, int events, void *tmp_pfd, int size_tmpfds)
{
if (pollfds_num == pollfds_size) {
if (size_tmpfds <= pollfds_size * sizeof(pollfds[0])) {
/* return min size needed for new pollfds area */
return((pollfds_size + 1) * sizeof(pollfds[0]));
}
if(pollfds != NULL){
memcpy(tmp_pfd, pollfds,
sizeof(pollfds[0]) * pollfds_size);
/* remove old pollfds */
kfree(pollfds);
}
pollfds = tmp_pfd;
pollfds_size++;
} else {
/* remove not used tmp_pfd */
if (tmp_pfd != NULL)
kfree(tmp_pfd);
}
pollfds[pollfds_num] = ((struct pollfd) { .fd = fd,
.events = events,
.revents = 0 });
pollfds_num++;
return(0);
}
void os_free_irq_by_cb(int (*test)(struct irq_fd *, void *), void *arg,
struct irq_fd *active_fds, struct irq_fd ***last_irq_ptr2)
{
struct irq_fd **prev;
int i = 0;
prev = &active_fds;
while(*prev != NULL){
if((*test)(*prev, arg)){
struct irq_fd *old_fd = *prev;
if((pollfds[i].fd != -1) &&
(pollfds[i].fd != (*prev)->fd)){
printk("os_free_irq_by_cb - mismatch between "
"active_fds and pollfds, fd %d vs %d\n",
(*prev)->fd, pollfds[i].fd);
goto out;
}
pollfds_num--;
/* This moves the *whole* array after pollfds[i]
* (though it doesn't spot as such)!
*/
memmove(&pollfds[i], &pollfds[i + 1],
(pollfds_num - i) * sizeof(pollfds[0]));
if(*last_irq_ptr2 == &old_fd->next)
*last_irq_ptr2 = prev;
*prev = (*prev)->next;
if(old_fd->type == IRQ_WRITE)
ignore_sigio_fd(old_fd->fd);
kfree(old_fd);
continue;
}
prev = &(*prev)->next;
i++;
}
out:
return;
}
int os_get_pollfd(int i)
{
return(pollfds[i].fd);
}
void os_set_pollfd(int i, int fd)
{
pollfds[i].fd = fd;
}
void os_set_ioignore(void)
{
set_handler(SIGIO, SIG_IGN, 0, -1);
}
void init_irq_signals(int on_sigstack)
{
__sighandler_t h;
int flags;
flags = on_sigstack ? SA_ONSTACK : 0;
if(timer_irq_inited) h = (__sighandler_t) alarm_handler;
else h = boot_timer_handler;
set_handler(SIGVTALRM, h, flags | SA_RESTART,
SIGUSR1, SIGIO, SIGWINCH, SIGALRM, -1);
set_handler(SIGIO, (__sighandler_t) sig_handler, flags | SA_RESTART,
SIGUSR1, SIGIO, SIGWINCH, SIGALRM, SIGVTALRM, -1);
signal(SIGWINCH, SIG_IGN);
}

10
arch/um/os-Linux/tt.c
View File

@ -110,6 +110,16 @@ int wait_for_stop(int pid, int sig, int cont_type, void *relay)
}
}
void forward_ipi(int fd, int pid)
{
int err;
err = os_set_owner(fd, pid);
if(err < 0)
printk("forward_ipi: set_owner failed, fd = %d, me = %d, "
"target = %d, err = %d\n", fd, os_getpid(), pid, -err);
}
/*
*-------------------------
* only for tt mode (will be deleted in future...)

6
arch/um/sys-i386/user-offsets.c
View File

@ -3,6 +3,7 @@
#include <asm/ptrace.h>
#include <asm/user.h>
#include <linux/stddef.h>
#include <sys/poll.h>
#define DEFINE(sym, val) \
asm volatile("\n->" #sym " %0 " #val : : "i" (val))
@ -67,4 +68,9 @@ void foo(void)
DEFINE(HOST_ES, ES);
DEFINE(HOST_GS, GS);
DEFINE(UM_FRAME_SIZE, sizeof(struct user_regs_struct));
/* XXX Duplicated between i386 and x86_64 */
DEFINE(UM_POLLIN, POLLIN);
DEFINE(UM_POLLPRI, POLLPRI);
DEFINE(UM_POLLOUT, POLLOUT);
}

6
arch/um/sys-x86_64/user-offsets.c
View File

@ -1,6 +1,7 @@
#include <stdio.h>
#include <stddef.h>
#include <signal.h>
#include <sys/poll.h>
#define __FRAME_OFFSETS
#include <asm/ptrace.h>
#include <asm/types.h>
@ -88,4 +89,9 @@ void foo(void)
DEFINE_LONGS(HOST_IP, RIP);
DEFINE_LONGS(HOST_SP, RSP);
DEFINE(UM_FRAME_SIZE, sizeof(struct user_regs_struct));
/* XXX Duplicated between i386 and x86_64 */
DEFINE(UM_POLLIN, POLLIN);
DEFINE(UM_POLLPRI, POLLPRI);
DEFINE(UM_POLLOUT, POLLOUT);
}