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-rw-r--r--arch/ia64/kernel/entry.S5
-rw-r--r--arch/ia64/kernel/mca.c55
-rw-r--r--arch/ia64/kernel/perfmon.c21
-rw-r--r--arch/ia64/kernel/process.c59
-rw-r--r--arch/ia64/kernel/ptrace.c139
5 files changed, 202 insertions, 77 deletions
diff --git a/arch/ia64/kernel/entry.S b/arch/ia64/kernel/entry.S
index f5d3efbfbeda..3c331c464b40 100644
--- a/arch/ia64/kernel/entry.S
+++ b/arch/ia64/kernel/entry.S
@@ -1573,7 +1573,7 @@ sys_call_table:
data8 sys_fchmodat
data8 sys_faccessat
data8 sys_pselect6
- data8 sys_ppoll
+ data8 sys_ppoll // 1295
data8 sys_unshare
data8 sys_splice
data8 sys_set_robust_list
@@ -1588,5 +1588,8 @@ sys_call_table:
data8 sys_signalfd
data8 sys_ni_syscall
data8 sys_eventfd
+ data8 sys_timerfd_create // 1310
+ data8 sys_timerfd_settime
+ data8 sys_timerfd_gettime
.org sys_call_table + 8*NR_syscalls // guard against failures to increase NR_syscalls
diff --git a/arch/ia64/kernel/mca.c b/arch/ia64/kernel/mca.c
index 846e7e036b13..6e17aed53135 100644
--- a/arch/ia64/kernel/mca.c
+++ b/arch/ia64/kernel/mca.c
@@ -17,7 +17,7 @@
* Copyright (C) 2000 Intel
* Copyright (C) Chuck Fleckenstein <cfleck@co.intel.com>
*
- * Copyright (C) 1999, 2004 Silicon Graphics, Inc.
+ * Copyright (C) 1999, 2004-2008 Silicon Graphics, Inc.
* Copyright (C) Vijay Chander <vijay@engr.sgi.com>
*
* Copyright (C) 2006 FUJITSU LIMITED
@@ -1762,11 +1762,8 @@ format_mca_init_stack(void *mca_data, unsigned long offset,
/* Caller prevents this from being called after init */
static void * __init_refok mca_bootmem(void)
{
- void *p;
-
- p = alloc_bootmem(sizeof(struct ia64_mca_cpu) * NR_CPUS +
- KERNEL_STACK_SIZE);
- return (void *)ALIGN((unsigned long)p, KERNEL_STACK_SIZE);
+ return __alloc_bootmem(sizeof(struct ia64_mca_cpu),
+ KERNEL_STACK_SIZE, 0);
}
/* Do per-CPU MCA-related initialization. */
@@ -1774,33 +1771,33 @@ void __cpuinit
ia64_mca_cpu_init(void *cpu_data)
{
void *pal_vaddr;
+ void *data;
+ long sz = sizeof(struct ia64_mca_cpu);
+ int cpu = smp_processor_id();
static int first_time = 1;
- if (first_time) {
- void *mca_data;
- int cpu;
-
- first_time = 0;
- mca_data = mca_bootmem();
- for (cpu = 0; cpu < NR_CPUS; cpu++) {
- format_mca_init_stack(mca_data,
- offsetof(struct ia64_mca_cpu, mca_stack),
- "MCA", cpu);
- format_mca_init_stack(mca_data,
- offsetof(struct ia64_mca_cpu, init_stack),
- "INIT", cpu);
- __per_cpu_mca[cpu] = __pa(mca_data);
- mca_data += sizeof(struct ia64_mca_cpu);
- }
- }
-
/*
- * The MCA info structure was allocated earlier and its
- * physical address saved in __per_cpu_mca[cpu]. Copy that
- * address * to ia64_mca_data so we can access it as a per-CPU
- * variable.
+ * Structure will already be allocated if cpu has been online,
+ * then offlined.
*/
- __get_cpu_var(ia64_mca_data) = __per_cpu_mca[smp_processor_id()];
+ if (__per_cpu_mca[cpu]) {
+ data = __va(__per_cpu_mca[cpu]);
+ } else {
+ if (first_time) {
+ data = mca_bootmem();
+ first_time = 0;
+ } else
+ data = page_address(alloc_pages_node(numa_node_id(),
+ GFP_KERNEL, get_order(sz)));
+ if (!data)
+ panic("Could not allocate MCA memory for cpu %d\n",
+ cpu);
+ }
+ format_mca_init_stack(data, offsetof(struct ia64_mca_cpu, mca_stack),
+ "MCA", cpu);
+ format_mca_init_stack(data, offsetof(struct ia64_mca_cpu, init_stack),
+ "INIT", cpu);
+ __get_cpu_var(ia64_mca_data) = __per_cpu_mca[cpu] = __pa(data);
/*
* Stash away a copy of the PTE needed to map the per-CPU page.
diff --git a/arch/ia64/kernel/perfmon.c b/arch/ia64/kernel/perfmon.c
index 78acd9fe97e9..f6b99719f10f 100644
--- a/arch/ia64/kernel/perfmon.c
+++ b/arch/ia64/kernel/perfmon.c
@@ -586,21 +586,6 @@ pfm_put_task(struct task_struct *task)
}
static inline void
-pfm_set_task_notify(struct task_struct *task)
-{
- struct thread_info *info;
-
- info = (struct thread_info *) ((char *) task + IA64_TASK_SIZE);
- set_bit(TIF_PERFMON_WORK, &info->flags);
-}
-
-static inline void
-pfm_clear_task_notify(void)
-{
- clear_thread_flag(TIF_PERFMON_WORK);
-}
-
-static inline void
pfm_reserve_page(unsigned long a)
{
SetPageReserved(vmalloc_to_page((void *)a));
@@ -3724,7 +3709,7 @@ pfm_restart(pfm_context_t *ctx, void *arg, int count, struct pt_regs *regs)
PFM_SET_WORK_PENDING(task, 1);
- pfm_set_task_notify(task);
+ tsk_set_notify_resume(task);
/*
* XXX: send reschedule if task runs on another CPU
@@ -5082,7 +5067,7 @@ pfm_handle_work(void)
PFM_SET_WORK_PENDING(current, 0);
- pfm_clear_task_notify();
+ tsk_clear_notify_resume(current);
regs = task_pt_regs(current);
@@ -5450,7 +5435,7 @@ pfm_overflow_handler(struct task_struct *task, pfm_context_t *ctx, u64 pmc0, str
* when coming from ctxsw, current still points to the
* previous task, therefore we must work with task and not current.
*/
- pfm_set_task_notify(task);
+ tsk_set_notify_resume(task);
}
/*
* defer until state is changed (shorten spin window). the context is locked
diff --git a/arch/ia64/kernel/process.c b/arch/ia64/kernel/process.c
index 7377d323131d..49937a383b23 100644
--- a/arch/ia64/kernel/process.c
+++ b/arch/ia64/kernel/process.c
@@ -52,7 +52,6 @@
#include "sigframe.h"
void (*ia64_mark_idle)(int);
-static DEFINE_PER_CPU(unsigned int, cpu_idle_state);
unsigned long boot_option_idle_override = 0;
EXPORT_SYMBOL(boot_option_idle_override);
@@ -157,6 +156,17 @@ show_regs (struct pt_regs *regs)
show_stack(NULL, NULL);
}
+void tsk_clear_notify_resume(struct task_struct *tsk)
+{
+#ifdef CONFIG_PERFMON
+ if (tsk->thread.pfm_needs_checking)
+ return;
+#endif
+ if (test_ti_thread_flag(task_thread_info(tsk), TIF_RESTORE_RSE))
+ return;
+ clear_ti_thread_flag(task_thread_info(tsk), TIF_NOTIFY_RESUME);
+}
+
void
do_notify_resume_user (sigset_t *unused, struct sigscratch *scr, long in_syscall)
{
@@ -175,6 +185,10 @@ do_notify_resume_user (sigset_t *unused, struct sigscratch *scr, long in_syscall
/* deal with pending signal delivery */
if (test_thread_flag(TIF_SIGPENDING)||test_thread_flag(TIF_RESTORE_SIGMASK))
ia64_do_signal(scr, in_syscall);
+
+ /* copy user rbs to kernel rbs */
+ if (unlikely(test_thread_flag(TIF_RESTORE_RSE)))
+ ia64_sync_krbs();
}
static int pal_halt = 1;
@@ -239,33 +253,23 @@ static inline void play_dead(void)
}
#endif /* CONFIG_HOTPLUG_CPU */
-void cpu_idle_wait(void)
+static void do_nothing(void *unused)
{
- unsigned int cpu, this_cpu = get_cpu();
- cpumask_t map;
- cpumask_t tmp = current->cpus_allowed;
-
- set_cpus_allowed(current, cpumask_of_cpu(this_cpu));
- put_cpu();
-
- cpus_clear(map);
- for_each_online_cpu(cpu) {
- per_cpu(cpu_idle_state, cpu) = 1;
- cpu_set(cpu, map);
- }
-
- __get_cpu_var(cpu_idle_state) = 0;
+}
- wmb();
- do {
- ssleep(1);
- for_each_online_cpu(cpu) {
- if (cpu_isset(cpu, map) && !per_cpu(cpu_idle_state, cpu))
- cpu_clear(cpu, map);
- }
- cpus_and(map, map, cpu_online_map);
- } while (!cpus_empty(map));
- set_cpus_allowed(current, tmp);
+/*
+ * cpu_idle_wait - Used to ensure that all the CPUs discard old value of
+ * pm_idle and update to new pm_idle value. Required while changing pm_idle
+ * handler on SMP systems.
+ *
+ * Caller must have changed pm_idle to the new value before the call. Old
+ * pm_idle value will not be used by any CPU after the return of this function.
+ */
+void cpu_idle_wait(void)
+{
+ smp_mb();
+ /* kick all the CPUs so that they exit out of pm_idle */
+ smp_call_function(do_nothing, NULL, 0, 1);
}
EXPORT_SYMBOL_GPL(cpu_idle_wait);
@@ -293,9 +297,6 @@ cpu_idle (void)
#ifdef CONFIG_SMP
min_xtp();
#endif
- if (__get_cpu_var(cpu_idle_state))
- __get_cpu_var(cpu_idle_state) = 0;
-
rmb();
if (mark_idle)
(*mark_idle)(1);
diff --git a/arch/ia64/kernel/ptrace.c b/arch/ia64/kernel/ptrace.c
index 2e96f17b2f3b..331d6768b5d5 100644
--- a/arch/ia64/kernel/ptrace.c
+++ b/arch/ia64/kernel/ptrace.c
@@ -547,6 +547,129 @@ ia64_sync_user_rbs (struct task_struct *child, struct switch_stack *sw,
return 0;
}
+static long
+ia64_sync_kernel_rbs (struct task_struct *child, struct switch_stack *sw,
+ unsigned long user_rbs_start, unsigned long user_rbs_end)
+{
+ unsigned long addr, val;
+ long ret;
+
+ /* now copy word for word from user rbs to kernel rbs: */
+ for (addr = user_rbs_start; addr < user_rbs_end; addr += 8) {
+ if (access_process_vm(child, addr, &val, sizeof(val), 0)
+ != sizeof(val))
+ return -EIO;
+
+ ret = ia64_poke(child, sw, user_rbs_end, addr, val);
+ if (ret < 0)
+ return ret;
+ }
+ return 0;
+}
+
+typedef long (*syncfunc_t)(struct task_struct *, struct switch_stack *,
+ unsigned long, unsigned long);
+
+static void do_sync_rbs(struct unw_frame_info *info, void *arg)
+{
+ struct pt_regs *pt;
+ unsigned long urbs_end;
+ syncfunc_t fn = arg;
+
+ if (unw_unwind_to_user(info) < 0)
+ return;
+ pt = task_pt_regs(info->task);
+ urbs_end = ia64_get_user_rbs_end(info->task, pt, NULL);
+
+ fn(info->task, info->sw, pt->ar_bspstore, urbs_end);
+}
+
+/*
+ * when a thread is stopped (ptraced), debugger might change thread's user
+ * stack (change memory directly), and we must avoid the RSE stored in kernel
+ * to override user stack (user space's RSE is newer than kernel's in the
+ * case). To workaround the issue, we copy kernel RSE to user RSE before the
+ * task is stopped, so user RSE has updated data. we then copy user RSE to
+ * kernel after the task is resummed from traced stop and kernel will use the
+ * newer RSE to return to user. TIF_RESTORE_RSE is the flag to indicate we need
+ * synchronize user RSE to kernel.
+ */
+void ia64_ptrace_stop(void)
+{
+ if (test_and_set_tsk_thread_flag(current, TIF_RESTORE_RSE))
+ return;
+ tsk_set_notify_resume(current);
+ unw_init_running(do_sync_rbs, ia64_sync_user_rbs);
+}
+
+/*
+ * This is called to read back the register backing store.
+ */
+void ia64_sync_krbs(void)
+{
+ clear_tsk_thread_flag(current, TIF_RESTORE_RSE);
+ tsk_clear_notify_resume(current);
+
+ unw_init_running(do_sync_rbs, ia64_sync_kernel_rbs);
+}
+
+/*
+ * After PTRACE_ATTACH, a thread's register backing store area in user
+ * space is assumed to contain correct data whenever the thread is
+ * stopped. arch_ptrace_stop takes care of this on tracing stops.
+ * But if the child was already stopped for job control when we attach
+ * to it, then it might not ever get into ptrace_stop by the time we
+ * want to examine the user memory containing the RBS.
+ */
+void
+ptrace_attach_sync_user_rbs (struct task_struct *child)
+{
+ int stopped = 0;
+ struct unw_frame_info info;
+
+ /*
+ * If the child is in TASK_STOPPED, we need to change that to
+ * TASK_TRACED momentarily while we operate on it. This ensures
+ * that the child won't be woken up and return to user mode while
+ * we are doing the sync. (It can only be woken up for SIGKILL.)
+ */
+
+ read_lock(&tasklist_lock);
+ if (child->signal) {
+ spin_lock_irq(&child->sighand->siglock);
+ if (child->state == TASK_STOPPED &&
+ !test_and_set_tsk_thread_flag(child, TIF_RESTORE_RSE)) {
+ tsk_set_notify_resume(child);
+
+ child->state = TASK_TRACED;
+ stopped = 1;
+ }
+ spin_unlock_irq(&child->sighand->siglock);
+ }
+ read_unlock(&tasklist_lock);
+
+ if (!stopped)
+ return;
+
+ unw_init_from_blocked_task(&info, child);
+ do_sync_rbs(&info, ia64_sync_user_rbs);
+
+ /*
+ * Now move the child back into TASK_STOPPED if it should be in a
+ * job control stop, so that SIGCONT can be used to wake it up.
+ */
+ read_lock(&tasklist_lock);
+ if (child->signal) {
+ spin_lock_irq(&child->sighand->siglock);
+ if (child->state == TASK_TRACED &&
+ (child->signal->flags & SIGNAL_STOP_STOPPED)) {
+ child->state = TASK_STOPPED;
+ }
+ spin_unlock_irq(&child->sighand->siglock);
+ }
+ read_unlock(&tasklist_lock);
+}
+
static inline int
thread_matches (struct task_struct *thread, unsigned long addr)
{
@@ -1422,6 +1545,7 @@ sys_ptrace (long request, pid_t pid, unsigned long addr, unsigned long data)
struct task_struct *child;
struct switch_stack *sw;
long ret;
+ struct unw_frame_info info;
lock_kernel();
ret = -EPERM;
@@ -1453,6 +1577,8 @@ sys_ptrace (long request, pid_t pid, unsigned long addr, unsigned long data)
if (request == PTRACE_ATTACH) {
ret = ptrace_attach(child);
+ if (!ret)
+ arch_ptrace_attach(child);
goto out_tsk;
}
@@ -1481,6 +1607,11 @@ sys_ptrace (long request, pid_t pid, unsigned long addr, unsigned long data)
/* write the word at location addr */
urbs_end = ia64_get_user_rbs_end(child, pt, NULL);
ret = ia64_poke(child, sw, urbs_end, addr, data);
+
+ /* Make sure user RBS has the latest data */
+ unw_init_from_blocked_task(&info, child);
+ do_sync_rbs(&info, ia64_sync_user_rbs);
+
goto out_tsk;
case PTRACE_PEEKUSR:
@@ -1634,6 +1765,10 @@ syscall_trace_enter (long arg0, long arg1, long arg2, long arg3,
&& (current->ptrace & PT_PTRACED))
syscall_trace();
+ /* copy user rbs to kernel rbs */
+ if (test_thread_flag(TIF_RESTORE_RSE))
+ ia64_sync_krbs();
+
if (unlikely(current->audit_context)) {
long syscall;
int arch;
@@ -1671,4 +1806,8 @@ syscall_trace_leave (long arg0, long arg1, long arg2, long arg3,
|| test_thread_flag(TIF_SINGLESTEP))
&& (current->ptrace & PT_PTRACED))
syscall_trace();
+
+ /* copy user rbs to kernel rbs */
+ if (test_thread_flag(TIF_RESTORE_RSE))
+ ia64_sync_krbs();
}
generated by cgit v1.2.3 (git 2.0.4) at 2024-11-09 03:33:25 +0000