/* afs_osi_TimedSleep
*
* Arguments:
* event - event to sleep on
* ams --- max sleep time in milliseconds
* aintok - 1 if should sleep interruptibly
*
* Returns 0 if timeout, EINTR if signalled, and EGAIN if it might
* have raced.
*/
int
afs_osi_TimedSleep(void *event, afs_int32 ams, int aintok)
{
int code = 0;
long ticks = (ams * HZ / 1000) + 1;
struct afs_event *evp;
#ifdef DECLARE_WAITQUEUE
DECLARE_WAITQUEUE(wait, current);
#else
struct wait_queue wait = { current, NULL };
#endif
evp = afs_getevent(event);
if (!evp) {
afs_addevent(event);
evp = afs_getevent(event);
}
add_wait_queue(&evp->cond, &wait);
set_current_state(TASK_INTERRUPTIBLE);
/* always sleep TASK_INTERRUPTIBLE to keep load average
* from artifically increasing. */
AFS_GUNLOCK();
if (aintok) {
if (schedule_timeout(ticks))
code = EINTR;
} else
schedule_timeout(ticks);
#ifdef CONFIG_PM
if (
#ifdef PF_FREEZE
current->flags & PF_FREEZE
#else
#if defined(STRUCT_TASK_STRUCT_HAS_TODO)
!current->todo
#else
#if defined(STRUCT_TASK_STRUCT_HAS_THREAD_INFO)
test_ti_thread_flag(current->thread_info, TIF_FREEZE)
#else
test_ti_thread_flag(task_thread_info(current), TIF_FREEZE)
#endif
#endif
#endif
)
#ifdef LINUX_REFRIGERATOR_TAKES_PF_FREEZE
refrigerator(PF_FREEZE);
#else
refrigerator();
#endif
#endif
AFS_GLOCK();
remove_wait_queue(&evp->cond, &wait);
set_current_state(TASK_RUNNING);
relevent(evp);
return code;
}
/* afs_osi_SleepSig
*
* Waits for an event to be notified, returning early if a signal
* is received. Returns EINTR if signaled, and 0 otherwise.
*/
int
afs_osi_SleepSig(void *event)
{
struct afs_event *evp;
int seq, retval;
#ifdef DECLARE_WAITQUEUE
DECLARE_WAITQUEUE(wait, current);
#else
struct wait_queue wait = { current, NULL };
#endif
evp = afs_getevent(event);
if (!evp) {
afs_addevent(event);
evp = afs_getevent(event);
}
seq = evp->seq;
retval = 0;
add_wait_queue(&evp->cond, &wait);
while (seq == evp->seq) {
set_current_state(TASK_INTERRUPTIBLE);
AFS_ASSERT_GLOCK();
AFS_GUNLOCK();
schedule();
#ifdef CONFIG_PM
if (
#ifdef PF_FREEZE
current->flags & PF_FREEZE
#else
#if defined(STRUCT_TASK_STRUCT_HAS_TODO)
!current->todo
#else
#if defined(STRUCT_TASK_STRUCT_HAS_THREAD_INFO)
test_ti_thread_flag(current->thread_info, TIF_FREEZE)
#else
test_ti_thread_flag(task_thread_info(current), TIF_FREEZE)
#endif
#endif
#endif
)
#ifdef LINUX_REFRIGERATOR_TAKES_PF_FREEZE
refrigerator(PF_FREEZE);
#else
refrigerator();
#endif
#endif
AFS_GLOCK();
if (signal_pending(current)) {
retval = EINTR;
break;
}
}
remove_wait_queue(&evp->cond, &wait);
set_current_state(TASK_RUNNING);
relevent(evp);
return retval;
}
/*
* Set the child iWMMXt state.
*/
static int ptrace_setwmmxregs(struct task_struct *tsk, void __user *ufp)
{
struct thread_info *thread = task_thread_info(tsk);
if (!test_ti_thread_flag(thread, TIF_USING_IWMMXT))
return -EACCES;
iwmmxt_task_release(thread); /* force a reload */
return copy_from_user(&thread->fpstate.iwmmxt, ufp, IWMMXT_SIZE)
? -EFAULT : 0;
}
/*
* Get the child iWMMXt state.
*/
static int ptrace_getwmmxregs(struct task_struct *tsk, void __user *ufp)
{
struct thread_info *thread = task_thread_info(tsk);
if (!test_ti_thread_flag(thread, TIF_USING_IWMMXT))
return -ENODATA;
iwmmxt_task_disable(thread); /* force it to ram */
return copy_to_user(ufp, &thread->fpstate.iwmmxt, IWMMXT_SIZE)
? -EFAULT : 0;
}
noinline void
fcse_flush_all_done(unsigned seq, unsigned dirty)
{
unsigned long flags;
if (!cache_is_vivt())
return;
spin_lock_irqsave(&fcse_lock, flags);
#if defined(CONFIG_IPIPE)
if (!test_ti_thread_flag(current_thread_info(), TIF_SWITCHED))
#elif defined(CONFIG_ARM_FCSE_PREEMPT_FLUSH)
if (seq == nr_context_switches())
#endif /* CONFIG_ARM_FCSE_PREEMPT_FLUSH */
fcse_clear_dirty_all();
if (dirty && current->mm != &init_mm && current->mm) {
unsigned fcse_pid =
current->mm->context.fcse.pid >> FCSE_PID_SHIFT;
__set_bit(FCSE_PID_MAX - fcse_pid, fcse_pids_cache_dirty);
}
/*
* mipsmt_sys_sched_setaffinity - set the cpu affinity of a process
*/
asmlinkage long mipsmt_sys_sched_setaffinity(pid_t pid, unsigned int len,
unsigned long __user *user_mask_ptr)
{
cpumask_t new_mask;
cpumask_t effective_mask;
int retval;
struct task_struct *p;
struct thread_info *ti;
uid_t euid;
if (len < sizeof(new_mask))
return -EINVAL;
if (copy_from_user(&new_mask, user_mask_ptr, sizeof(new_mask)))
return -EFAULT;
get_online_cpus();
read_lock(&tasklist_lock);
p = find_process_by_pid(pid);
if (!p) {
read_unlock(&tasklist_lock);
put_online_cpus();
return -ESRCH;
}
/*
* It is not safe to call set_cpus_allowed with the
* tasklist_lock held. We will bump the task_struct's
* usage count and drop tasklist_lock before invoking
* set_cpus_allowed.
*/
get_task_struct(p);
euid = current_euid();
retval = -EPERM;
if (euid != p->cred->euid && euid != p->cred->uid &&
!capable(CAP_SYS_NICE)) {
read_unlock(&tasklist_lock);
goto out_unlock;
}
retval = security_task_setscheduler(p, 0, NULL);
if (retval)
goto out_unlock;
/* Record new user-specified CPU set for future reference */
p->thread.user_cpus_allowed = new_mask;
/* Unlock the task list */
read_unlock(&tasklist_lock);
/* Compute new global allowed CPU set if necessary */
ti = task_thread_info(p);
if (test_ti_thread_flag(ti, TIF_FPUBOUND) &&
cpus_intersects(new_mask, mt_fpu_cpumask)) {
cpus_and(effective_mask, new_mask, mt_fpu_cpumask);
retval = set_cpus_allowed_ptr(p, &effective_mask);
} else {
clear_ti_thread_flag(ti, TIF_FPUBOUND);
retval = set_cpus_allowed_ptr(p, &new_mask);
}
out_unlock:
put_task_struct(p);
put_online_cpus();
return retval;
}
asmlinkage struct pt_regs *do_debug(struct pt_regs *regs)
{
struct thread_info *ti;
unsigned long trampoline_addr;
u32 status;
u32 ctrl;
int code;
status = ocd_read(DS);
ti = current_thread_info();
code = TRAP_BRKPT;
pr_debug("do_debug: status=0x%08x PC=0x%08lx SR=0x%08lx tif=0x%08lx\n",
status, regs->pc, regs->sr, ti->flags);
if (!user_mode(regs)) {
unsigned long die_val = DIE_BREAKPOINT;
if (status & (1 << OCD_DS_SSS_BIT))
die_val = DIE_SSTEP;
if (notify_die(die_val, "ptrace", regs, 0, 0, SIGTRAP)
== NOTIFY_STOP)
return regs;
if ((status & (1 << OCD_DS_SWB_BIT))
&& test_and_clear_ti_thread_flag(
ti, TIF_BREAKPOINT)) {
/*
* Explicit breakpoint from trampoline or
* exception/syscall/interrupt handler.
*
* The real saved regs are on the stack right
* after the ones we saved on entry.
*/
regs++;
pr_debug(" -> TIF_BREAKPOINT done, adjusted regs:"
"PC=0x%08lx SR=0x%08lx\n",
regs->pc, regs->sr);
BUG_ON(!user_mode(regs));
if (test_thread_flag(TIF_SINGLE_STEP)) {
pr_debug("Going to do single step...\n");
return regs;
}
/*
* No TIF_SINGLE_STEP means we're done
* stepping over a syscall. Do the trap now.
*/
code = TRAP_TRACE;
} else if ((status & (1 << OCD_DS_SSS_BIT))
&& test_ti_thread_flag(ti, TIF_SINGLE_STEP)) {
pr_debug("Stepped into something, "
"setting TIF_BREAKPOINT...\n");
set_ti_thread_flag(ti, TIF_BREAKPOINT);
/*
* We stepped into an exception, interrupt or
* syscall handler. Some exception handlers
* don't check for pending work, so we need to
* set up a trampoline just in case.
*
* The exception entry code will undo the
* trampoline stuff if it does a full context
* save (which also means that it'll check for
* pending work later.)
*/
if ((regs->sr & MODE_MASK) == MODE_EXCEPTION) {
trampoline_addr
= (unsigned long)&debug_trampoline;
pr_debug("Setting up trampoline...\n");
ti->rar_saved = sysreg_read(RAR_EX);
ti->rsr_saved = sysreg_read(RSR_EX);
sysreg_write(RAR_EX, trampoline_addr);
sysreg_write(RSR_EX, (MODE_EXCEPTION
| SR_EM | SR_GM));
BUG_ON(ti->rsr_saved & MODE_MASK);
}
/*
* If we stepped into a system call, we
* shouldn't do a single step after we return
* since the return address is right after the
* "scall" instruction we were told to step
* over.
*/
if ((regs->sr & MODE_MASK) == MODE_SUPERVISOR) {
pr_debug("Supervisor; no single step\n");
clear_ti_thread_flag(ti, TIF_SINGLE_STEP);
}
ctrl = ocd_read(DC);
ctrl &= ~(1 << OCD_DC_SS_BIT);
ocd_write(DC, ctrl);
return regs;
} else {
printk(KERN_ERR "Unexpected OCD_DS value: 0x%08x\n",
status);
printk(KERN_ERR "Thread flags: 0x%08lx\n", ti->flags);
die("Unhandled debug trap in kernel mode",
regs, SIGTRAP);
}
} else if (status & (1 << OCD_DS_SSS_BIT)) {
/* Single step in user mode */
code = TRAP_TRACE;
ctrl = ocd_read(DC);
ctrl &= ~(1 << OCD_DC_SS_BIT);
ocd_write(DC, ctrl);
}
pr_debug("Sending SIGTRAP: code=%d PC=0x%08lx SR=0x%08lx\n",
code, regs->pc, regs->sr);
clear_thread_flag(TIF_SINGLE_STEP);
_exception(SIGTRAP, regs, code, instruction_pointer(regs));
return regs;
}
/*
* mipsmt_sys_sched_setaffinity - set the cpu affinity of a process
*/
asmlinkage long mipsmt_sys_sched_setaffinity(pid_t pid, unsigned int len,
unsigned long __user *user_mask_ptr)
{
cpumask_var_t cpus_allowed, new_mask, effective_mask;
struct thread_info *ti;
struct task_struct *p;
int retval;
if (len < sizeof(new_mask))
return -EINVAL;
if (copy_from_user(&new_mask, user_mask_ptr, sizeof(new_mask)))
return -EFAULT;
get_online_cpus();
rcu_read_lock();
p = find_process_by_pid(pid);
if (!p) {
rcu_read_unlock();
put_online_cpus();
return -ESRCH;
}
/* Prevent p going away */
get_task_struct(p);
rcu_read_unlock();
if (!alloc_cpumask_var(&cpus_allowed, GFP_KERNEL)) {
retval = -ENOMEM;
goto out_put_task;
}
if (!alloc_cpumask_var(&new_mask, GFP_KERNEL)) {
retval = -ENOMEM;
goto out_free_cpus_allowed;
}
if (!alloc_cpumask_var(&effective_mask, GFP_KERNEL)) {
retval = -ENOMEM;
goto out_free_new_mask;
}
retval = -EPERM;
if (!check_same_owner(p) && !capable(CAP_SYS_NICE))
goto out_unlock;
retval = security_task_setscheduler(p);
if (retval)
goto out_unlock;
/* Record new user-specified CPU set for future reference */
cpumask_copy(&p->thread.user_cpus_allowed, new_mask);
again:
/* Compute new global allowed CPU set if necessary */
ti = task_thread_info(p);
if (test_ti_thread_flag(ti, TIF_FPUBOUND) &&
cpus_intersects(*new_mask, mt_fpu_cpumask)) {
cpus_and(*effective_mask, *new_mask, mt_fpu_cpumask);
retval = set_cpus_allowed_ptr(p, effective_mask);
} else {
cpumask_copy(effective_mask, new_mask);
clear_ti_thread_flag(ti, TIF_FPUBOUND);
retval = set_cpus_allowed_ptr(p, new_mask);
}
if (!retval) {
cpuset_cpus_allowed(p, cpus_allowed);
if (!cpumask_subset(effective_mask, cpus_allowed)) {
/*
* We must have raced with a concurrent cpuset
* update. Just reset the cpus_allowed to the
* cpuset's cpus_allowed
*/
cpumask_copy(new_mask, cpus_allowed);
goto again;
}
}
out_unlock:
free_cpumask_var(effective_mask);
out_free_new_mask:
free_cpumask_var(new_mask);
out_free_cpus_allowed:
free_cpumask_var(cpus_allowed);
out_put_task:
put_task_struct(p);
put_online_cpus();
return retval;
}
/* CV_WAIT and CV_TIMEDWAIT sleep until the specified event occurs, or, in the
* case of CV_TIMEDWAIT, until the specified timeout occurs.
* - NOTE: that on Linux, there are circumstances in which TASK_INTERRUPTIBLE
* can wake up, even if all signals are blocked
* - TODO: handle signals correctly by passing an indication back to the
* caller that the wait has been interrupted and the stack should be cleaned
* up preparatory to signal delivery
*/
int
afs_cv_wait(afs_kcondvar_t * cv, afs_kmutex_t * l, int sigok)
{
int seq, isAFSGlocked = ISAFS_GLOCK();
sigset_t saved_set;
#ifdef DECLARE_WAITQUEUE
DECLARE_WAITQUEUE(wait, current);
#else
struct wait_queue wait = { current, NULL };
#endif
sigemptyset(&saved_set);
seq = cv->seq;
set_current_state(TASK_INTERRUPTIBLE);
add_wait_queue(&cv->waitq, &wait);
if (isAFSGlocked)
AFS_GUNLOCK();
MUTEX_EXIT(l);
if (!sigok) {
SIG_LOCK(current);
saved_set = current->blocked;
sigfillset(¤t->blocked);
RECALC_SIGPENDING(current);
SIG_UNLOCK(current);
}
while(seq == cv->seq) {
schedule();
#ifdef AFS_LINUX26_ENV
#ifdef CONFIG_PM
if (
#ifdef PF_FREEZE
current->flags & PF_FREEZE
#else
#if defined(STRUCT_TASK_STRUCT_HAS_TODO)
!current->todo
#else
#if defined(STRUCT_TASK_STRUCT_HAS_THREAD_INFO)
test_ti_thread_flag(current->thread_info, TIF_FREEZE)
#else
test_ti_thread_flag(task_thread_info(current), TIF_FREEZE)
#endif
#endif
#endif
)
#ifdef LINUX_REFRIGERATOR_TAKES_PF_FREEZE
refrigerator(PF_FREEZE);
#else
refrigerator();
#endif
set_current_state(TASK_INTERRUPTIBLE);
#endif
#endif
}
remove_wait_queue(&cv->waitq, &wait);
set_current_state(TASK_RUNNING);
if (!sigok) {
SIG_LOCK(current);
current->blocked = saved_set;
RECALC_SIGPENDING(current);
SIG_UNLOCK(current);
}
if (isAFSGlocked)
AFS_GLOCK();
MUTEX_ENTER(l);
return (sigok && signal_pending(current)) ? EINTR : 0;
}
