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Diffstat (limited to 'arch/ia64/kernel/traps.c')
-rw-r--r--arch/ia64/kernel/traps.c162
1 files changed, 77 insertions, 85 deletions
diff --git a/arch/ia64/kernel/traps.c b/arch/ia64/kernel/traps.c
index 55391901b01..d3636e67a98 100644
--- a/arch/ia64/kernel/traps.c
+++ b/arch/ia64/kernel/traps.c
@@ -7,7 +7,6 @@
* 05/12/00 grao <goutham.rao@intel.com> : added isr in siginfo for SIGFPE
*/
-#include <linux/config.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/sched.h>
@@ -16,35 +15,18 @@
#include <linux/module.h> /* for EXPORT_SYMBOL */
#include <linux/hardirq.h>
#include <linux/kprobes.h>
+#include <linux/delay.h> /* for ssleep() */
+#include <linux/kdebug.h>
#include <asm/fpswa.h>
-#include <asm/ia32.h>
#include <asm/intrinsics.h>
#include <asm/processor.h>
#include <asm/uaccess.h>
-#include <asm/kdebug.h>
-
-extern spinlock_t timerlist_lock;
+#include <asm/setup.h>
fpswa_interface_t *fpswa_interface;
EXPORT_SYMBOL(fpswa_interface);
-struct notifier_block *ia64die_chain;
-
-int
-register_die_notifier(struct notifier_block *nb)
-{
- return notifier_chain_register(&ia64die_chain, nb);
-}
-EXPORT_SYMBOL_GPL(register_die_notifier);
-
-int
-unregister_die_notifier(struct notifier_block *nb)
-{
- return notifier_chain_unregister(&ia64die_chain, nb);
-}
-EXPORT_SYMBOL_GPL(unregister_die_notifier);
-
void __init
trap_init (void)
{
@@ -53,35 +35,7 @@ trap_init (void)
fpswa_interface = __va(ia64_boot_param->fpswa);
}
-/*
- * Unlock any spinlocks which will prevent us from getting the message out (timerlist_lock
- * is acquired through the console unblank code)
- */
-void
-bust_spinlocks (int yes)
-{
- int loglevel_save = console_loglevel;
-
- if (yes) {
- oops_in_progress = 1;
- return;
- }
-
-#ifdef CONFIG_VT
- unblank_screen();
-#endif
- oops_in_progress = 0;
- /*
- * OK, the message is on the console. Now we call printk() without
- * oops_in_progress set so that printk will give klogd a poke. Hold onto
- * your hats...
- */
- console_loglevel = 15; /* NMI oopser may have shut the console up */
- printk(" ");
- console_loglevel = loglevel_save;
-}
-
-void
+int
die (const char *str, struct pt_regs *regs, long err)
{
static struct {
@@ -89,9 +43,9 @@ die (const char *str, struct pt_regs *regs, long err)
u32 lock_owner;
int lock_owner_depth;
} die = {
- .lock = SPIN_LOCK_UNLOCKED,
- .lock_owner = -1,
- .lock_owner_depth = 0
+ .lock = __SPIN_LOCK_UNLOCKED(die.lock),
+ .lock_owner = -1,
+ .lock_owner_depth = 0
};
static int die_counter;
int cpu = get_cpu();
@@ -107,23 +61,36 @@ die (const char *str, struct pt_regs *regs, long err)
if (++die.lock_owner_depth < 3) {
printk("%s[%d]: %s %ld [%d]\n",
- current->comm, current->pid, str, err, ++die_counter);
- (void) notify_die(DIE_OOPS, (char *)str, regs, err, 255, SIGSEGV);
- show_regs(regs);
+ current->comm, task_pid_nr(current), str, err, ++die_counter);
+ if (notify_die(DIE_OOPS, str, regs, err, 255, SIGSEGV)
+ != NOTIFY_STOP)
+ show_regs(regs);
+ else
+ regs = NULL;
} else
printk(KERN_ERR "Recursive die() failure, output suppressed\n");
bust_spinlocks(0);
die.lock_owner = -1;
+ add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE);
spin_unlock_irq(&die.lock);
+
+ if (!regs)
+ return 1;
+
+ if (panic_on_oops)
+ panic("Fatal exception");
+
do_exit(SIGSEGV);
+ return 0;
}
-void
+int
die_if_kernel (char *str, struct pt_regs *regs, long err)
{
if (!user_mode(regs))
- die(str, regs, err);
+ return die(str, regs, err);
+ return 0;
}
void
@@ -143,7 +110,8 @@ __kprobes ia64_bad_break (unsigned long break_num, struct pt_regs *regs)
if (notify_die(DIE_BREAK, "break 0", regs, break_num, TRAP_BRKPT, SIGTRAP)
== NOTIFY_STOP)
return;
- die_if_kernel("bugcheck!", regs, break_num);
+ if (die_if_kernel("bugcheck!", regs, break_num))
+ return;
sig = SIGILL; code = ILL_ILLOPC;
break;
@@ -196,8 +164,9 @@ __kprobes ia64_bad_break (unsigned long break_num, struct pt_regs *regs)
break;
default:
- if (break_num < 0x40000 || break_num > 0x100000)
- die_if_kernel("Bad break", regs, break_num);
+ if ((break_num < 0x40000 || break_num > 0x100000)
+ && die_if_kernel("Bad break", regs, break_num))
+ return;
if (break_num < 0x80000) {
sig = SIGILL; code = __ILL_BREAK;
@@ -303,6 +272,15 @@ fp_emulate (int fp_fault, void *bundle, long *ipsr, long *fpsr, long *isr, long
return ret.status;
}
+struct fpu_swa_msg {
+ unsigned long count;
+ unsigned long time;
+};
+static DEFINE_PER_CPU(struct fpu_swa_msg, cpulast);
+DECLARE_PER_CPU(struct fpu_swa_msg, cpulast);
+static struct fpu_swa_msg last __cacheline_aligned;
+
+
/*
* Handle floating-point assist faults and traps.
*/
@@ -312,8 +290,6 @@ handle_fpu_swa (int fp_fault, struct pt_regs *regs, unsigned long isr)
long exception, bundle[2];
unsigned long fault_ip;
struct siginfo siginfo;
- static int fpu_swa_count = 0;
- static unsigned long last_time;
fault_ip = regs->cr_iip;
if (!fp_fault && (ia64_psr(regs)->ri == 0))
@@ -321,14 +297,37 @@ handle_fpu_swa (int fp_fault, struct pt_regs *regs, unsigned long isr)
if (copy_from_user(bundle, (void __user *) fault_ip, sizeof(bundle)))
return -1;
- if (jiffies - last_time > 5*HZ)
- fpu_swa_count = 0;
- if ((fpu_swa_count < 4) && !(current->thread.flags & IA64_THREAD_FPEMU_NOPRINT)) {
- last_time = jiffies;
- ++fpu_swa_count;
- printk(KERN_WARNING
- "%s(%d): floating-point assist fault at ip %016lx, isr %016lx\n",
- current->comm, current->pid, regs->cr_iip + ia64_psr(regs)->ri, isr);
+ if (!(current->thread.flags & IA64_THREAD_FPEMU_NOPRINT)) {
+ unsigned long count, current_jiffies = jiffies;
+ struct fpu_swa_msg *cp = &__get_cpu_var(cpulast);
+
+ if (unlikely(current_jiffies > cp->time))
+ cp->count = 0;
+ if (unlikely(cp->count < 5)) {
+ cp->count++;
+ cp->time = current_jiffies + 5 * HZ;
+
+ /* minimize races by grabbing a copy of count BEFORE checking last.time. */
+ count = last.count;
+ barrier();
+
+ /*
+ * Lower 4 bits are used as a count. Upper bits are a sequence
+ * number that is updated when count is reset. The cmpxchg will
+ * fail is seqno has changed. This minimizes mutiple cpus
+ * resetting the count.
+ */
+ if (current_jiffies > last.time)
+ (void) cmpxchg_acq(&last.count, count, 16 + (count & ~15));
+
+ /* used fetchadd to atomically update the count */
+ if ((last.count & 15) < 5 && (ia64_fetchadd(1, &last.count, acq) & 15) < 5) {
+ last.time = current_jiffies + 5 * HZ;
+ printk(KERN_WARNING
+ "%s(%d): floating-point assist fault at ip %016lx, isr %016lx\n",
+ current->comm, task_pid_nr(current), regs->cr_iip + ia64_psr(regs)->ri, isr);
+ }
+ }
}
exception = fp_emulate(fp_fault, bundle, &regs->cr_ipsr, &regs->ar_fpsr, &isr, &regs->pr,
@@ -413,14 +412,15 @@ ia64_illegal_op_fault (unsigned long ec, long arg1, long arg2, long arg3,
#endif
sprintf(buf, "IA-64 Illegal operation fault");
- die_if_kernel(buf, &regs, 0);
+ rv.fkt = 0;
+ if (die_if_kernel(buf, &regs, 0))
+ return rv;
memset(&si, 0, sizeof(si));
si.si_signo = SIGILL;
si.si_code = ILL_ILLOPC;
si.si_addr = (void __user *) (regs.cr_iip + ia64_psr(&regs)->ri);
force_sig_info(SIGILL, &si, current);
- rv.fkt = 0;
return rv;
}
@@ -464,7 +464,7 @@ ia64_fault (unsigned long vector, unsigned long isr, unsigned long ifa,
if (code == 8) {
# ifdef CONFIG_IA64_PRINT_HAZARDS
printk("%s[%d]: possible hazard @ ip=%016lx (pr = %016lx)\n",
- current->comm, current->pid,
+ current->comm, task_pid_nr(current),
regs.cr_iip + ia64_psr(&regs)->ri, regs.pr);
# endif
return;
@@ -626,21 +626,13 @@ ia64_fault (unsigned long vector, unsigned long isr, unsigned long ifa,
break;
case 45:
-#ifdef CONFIG_IA32_SUPPORT
- if (ia32_exception(&regs, isr) == 0)
- return;
-#endif
printk(KERN_ERR "Unexpected IA-32 exception (Trap 45)\n");
printk(KERN_ERR " iip - 0x%lx, ifa - 0x%lx, isr - 0x%lx\n",
iip, ifa, isr);
force_sig(SIGSEGV, current);
- break;
+ return;
case 46:
-#ifdef CONFIG_IA32_SUPPORT
- if (ia32_intercept(&regs, isr) == 0)
- return;
-#endif
printk(KERN_ERR "Unexpected IA-32 intercept trap (Trap 46)\n");
printk(KERN_ERR " iip - 0x%lx, ifa - 0x%lx, isr - 0x%lx, iim - 0x%lx\n",
iip, ifa, isr, iim);
@@ -655,6 +647,6 @@ ia64_fault (unsigned long vector, unsigned long isr, unsigned long ifa,
sprintf(buf, "Fault %lu", vector);
break;
}
- die_if_kernel(buf, &regs, error);
- force_sig(SIGILL, current);
+ if (!die_if_kernel(buf, &regs, error))
+ force_sig(SIGILL, current);
}
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-12-05 18:53:25 +0000