*
* Copyright (C) 1998-2003 Hewlett-Packard Co
* David Mosberger-Tang <davidm@hpl.hp.com>
+ * 04/11/17 Ashok Raj <ashok.raj@intel.com> Added CPU Hotplug Support
+ *
+ * 2005-10-07 Keith Owens <kaos@sgi.com>
+ * Add notify_die() hooks.
*/
#define __KERNEL_SYSCALLS__ /* see <asm/unistd.h> */
#include <linux/config.h>
#include <linux/unistd.h>
#include <linux/efi.h>
#include <linux/interrupt.h>
+#include <linux/delay.h>
#include <asm/cpu.h>
#include <asm/delay.h>
#include <asm/elf.h>
#include <asm/ia32.h>
#include <asm/irq.h>
+#include <asm/kdebug.h>
#include <asm/pgalloc.h>
#include <asm/processor.h>
#include <asm/sal.h>
#include <asm/unwind.h>
#include <asm/user.h>
+#include "entry.h"
+
#ifdef CONFIG_PERFMON
# include <asm/perfmon.h>
#endif
#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);
void
ia64_do_show_stack (struct unw_frame_info *info, void *arg)
show_stack (struct task_struct *task, unsigned long *sp)
{
if (!task)
- unw_init_running(ia64_do_show_stack, 0);
+ unw_init_running(ia64_do_show_stack, NULL);
else {
struct unw_frame_info info;
unw_init_from_blocked_task(&info, task);
- ia64_do_show_stack(&info, 0);
+ ia64_do_show_stack(&info, NULL);
}
}
ndirty = (regs->loadrs >> 19);
bsp = ia64_rse_skip_regs((unsigned long *) regs->ar_bspstore, ndirty);
for (i = 0; i < sof; ++i) {
- get_user(val, ia64_rse_skip_regs(bsp, i));
+ get_user(val, (unsigned long __user *) ia64_rse_skip_regs(bsp, i));
printk("r%-3u:%c%016lx%s", 32 + i, is_nat ? '*' : ' ', val,
((i == sof - 1) || (i % 3) == 2) ? "\n" : " ");
}
ia64_do_signal(oldset, scr, in_syscall);
}
-static int pal_halt = 1;
+static int pal_halt = 1;
+static int can_do_pal_halt = 1;
+
static int __init nohalt_setup(char * str)
{
- pal_halt = 0;
+ pal_halt = can_do_pal_halt = 0;
return 1;
}
__setup("nohalt", nohalt_setup);
+void
+update_pal_halt_status(int status)
+{
+ can_do_pal_halt = pal_halt && status;
+}
+
/*
* We use this if we don't have any better idle routine..
*/
void
default_idle (void)
{
- unsigned long pmu_active = ia64_getreg(_IA64_REG_PSR) & (IA64_PSR_PP | IA64_PSR_UP);
-
- while (!need_resched())
- if (pal_halt && !pmu_active)
+ local_irq_enable();
+ while (!need_resched()) {
+ if (can_do_pal_halt)
safe_halt();
+ else
+ cpu_relax();
+ }
}
#ifdef CONFIG_HOTPLUG_CPU
static inline void play_dead(void)
{
extern void ia64_cpu_local_tick (void);
+ unsigned int this_cpu = smp_processor_id();
+
/* Ack it */
__get_cpu_var(cpu_state) = CPU_DEAD;
- /* We shouldn't have to disable interrupts while dead, but
- * some interrupts just don't seem to go away, and this makes
- * it "work" for testing purposes. */
max_xtp();
local_irq_disable();
- /* Death loop */
- while (__get_cpu_var(cpu_state) != CPU_UP_PREPARE)
- cpu_relax();
-
+ idle_task_exit();
+ ia64_jump_to_sal(&sal_boot_rendez_state[this_cpu]);
/*
- * Enable timer interrupts from now on
- * Not required if we put processor in SAL_BOOT_RENDEZ mode.
+ * The above is a point of no-return, the processor is
+ * expected to be in SAL loop now.
*/
- local_flush_tlb_all();
- cpu_set(smp_processor_id(), cpu_online_map);
- wmb();
- ia64_cpu_local_tick ();
- local_irq_enable();
+ BUG();
}
#else
static inline void play_dead(void)
}
#endif /* CONFIG_HOTPLUG_CPU */
+void cpu_idle_wait(void)
+{
+ unsigned int cpu, this_cpu = get_cpu();
+ cpumask_t map;
+
+ 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));
+}
+EXPORT_SYMBOL_GPL(cpu_idle_wait);
+
void __attribute__((noreturn))
-cpu_idle (void *unused)
+cpu_idle (void)
{
void (*mark_idle)(int) = ia64_mark_idle;
+ int cpu = smp_processor_id();
/* endless idle loop with no priority at all */
while (1) {
- void (*idle)(void) = pm_idle;
- if (!idle)
- idle = default_idle;
+ if (can_do_pal_halt)
+ clear_thread_flag(TIF_POLLING_NRFLAG);
+ else
+ set_thread_flag(TIF_POLLING_NRFLAG);
+ if (!need_resched()) {
+ void (*idle)(void);
#ifdef CONFIG_SMP
- if (!need_resched())
min_xtp();
#endif
- while (!need_resched()) {
+ if (__get_cpu_var(cpu_idle_state))
+ __get_cpu_var(cpu_idle_state) = 0;
+
+ rmb();
if (mark_idle)
(*mark_idle)(1);
- (*idle)();
- }
-
- if (mark_idle)
- (*mark_idle)(0);
+ idle = pm_idle;
+ if (!idle)
+ idle = default_idle;
+ (*idle)();
+ if (mark_idle)
+ (*mark_idle)(0);
#ifdef CONFIG_SMP
- normal_xtp();
+ normal_xtp();
#endif
+ }
+ preempt_enable_no_resched();
schedule();
+ preempt_disable();
check_pgt_cache();
- if (cpu_is_offline(smp_processor_id()))
+ if (cpu_is_offline(cpu))
play_dead();
}
}
#endif
#ifdef CONFIG_IA32_SUPPORT
- if (IS_IA32_PROCESS(ia64_task_regs(task)))
+ if (IS_IA32_PROCESS(task_pt_regs(task)))
ia32_save_state(task);
#endif
}
#endif
#ifdef CONFIG_IA32_SUPPORT
- if (IS_IA32_PROCESS(ia64_task_regs(task)))
+ if (IS_IA32_PROCESS(task_pt_regs(task)))
ia32_load_state(task);
#endif
}
* If we're cloning an IA32 task then save the IA32 extra
* state from the current task to the new task
*/
- if (IS_IA32_PROCESS(ia64_task_regs(current))) {
+ if (IS_IA32_PROCESS(task_pt_regs(current))) {
ia32_save_state(p);
if (clone_flags & CLONE_SETTLS)
retval = ia32_clone_tls(p, child_ptregs);
return 1; /* f0-f31 are always valid so we always return 1 */
}
-asmlinkage long
-sys_execve (char *filename, char **argv, char **envp, struct pt_regs *regs)
+long
+sys_execve (char __user *filename, char __user * __user *argv, char __user * __user *envp,
+ struct pt_regs *regs)
{
+ char *fname;
int error;
- filename = getname(filename);
- error = PTR_ERR(filename);
- if (IS_ERR(filename))
+ fname = getname(filename);
+ error = PTR_ERR(fname);
+ if (IS_ERR(fname))
goto out;
- error = do_execve(filename, argv, envp, regs);
- putname(filename);
+ error = do_execve(fname, argv, envp, regs);
+ putname(fname);
out:
return error;
}
regs.pt.cr_ifs = 1UL << 63; /* mark as valid, empty frame */
regs.sw.ar_fpsr = regs.pt.ar_fpsr = ia64_getreg(_IA64_REG_AR_FPSR);
regs.sw.ar_bspstore = (unsigned long) current + IA64_RBS_OFFSET;
-
+ regs.sw.pr = (1 << PRED_KERNEL_STACK);
return do_fork(flags | CLONE_VM | CLONE_UNTRACED, 0, ®s.pt, 0, NULL, NULL);
}
EXPORT_SYMBOL(kernel_thread);
kernel_thread_helper (int (*fn)(void *), void *arg)
{
#ifdef CONFIG_IA32_SUPPORT
- if (IS_IA32_PROCESS(ia64_task_regs(current))) {
+ if (IS_IA32_PROCESS(task_pt_regs(current))) {
/* A kernel thread is always a 64-bit process. */
current->thread.map_base = DEFAULT_MAP_BASE;
current->thread.task_size = DEFAULT_TASK_SIZE;
/* drop floating-point and debug-register state if it exists: */
current->thread.flags &= ~(IA64_THREAD_FPH_VALID | IA64_THREAD_DBG_VALID);
ia64_drop_fpu(current);
- if (IS_IA32_PROCESS(ia64_task_regs(current)))
+#ifdef CONFIG_IA32_SUPPORT
+ if (IS_IA32_PROCESS(task_pt_regs(current))) {
ia32_drop_partial_page_list(current);
+ current->thread.task_size = IA32_PAGE_OFFSET;
+ set_fs(USER_DS);
+ }
+#endif
}
/*
void
exit_thread (void)
{
+
ia64_drop_fpu(current);
#ifdef CONFIG_PERFMON
/* if needed, stop monitoring and flush state to perfmon context */
if (current->thread.flags & IA64_THREAD_DBG_VALID)
pfm_release_debug_registers(current);
#endif
- if (IS_IA32_PROCESS(ia64_task_regs(current)))
+ if (IS_IA32_PROCESS(task_pt_regs(current)))
ia32_drop_partial_page_list(current);
}
void
machine_restart (char *restart_cmd)
{
- (*efi.reset_system)(EFI_RESET_WARM, 0, 0, 0);
+ (void) notify_die(DIE_MACHINE_RESTART, restart_cmd, NULL, 0, 0, 0);
+ (*efi.reset_system)(EFI_RESET_WARM, 0, 0, NULL);
}
-EXPORT_SYMBOL(machine_restart);
-
void
machine_halt (void)
{
+ (void) notify_die(DIE_MACHINE_HALT, "", NULL, 0, 0, 0);
cpu_halt();
}
-EXPORT_SYMBOL(machine_halt);
-
void
machine_power_off (void)
{
machine_halt();
}
-EXPORT_SYMBOL(machine_power_off);
git://git.onelab.eu / linux-2.6.git / blobdiff