#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/smp.h>
+#include <linux/prctl.h>
#include <linux/slab.h>
#include <linux/sched.h>
#include <linux/module.h>
#include <linux/pm.h>
#include <linux/clockchips.h>
+#include <linux/random.h>
+#include <linux/user-return-notifier.h>
+#include <trace/events/power.h>
+#include <asm/system.h>
+#include <asm/apic.h>
+#include <asm/syscalls.h>
+#include <asm/idle.h>
+#include <asm/uaccess.h>
+#include <asm/i387.h>
+#include <asm/ds.h>
+
+unsigned long idle_halt;
+EXPORT_SYMBOL(idle_halt);
+unsigned long idle_nomwait;
+EXPORT_SYMBOL(idle_nomwait);
struct kmem_cache *task_xstate_cachep;
kmem_cache_free(task_xstate_cachep, tsk->thread.xstate);
tsk->thread.xstate = NULL;
}
+
+ WARN(tsk->thread.ds_ctx, "leaking DS context\n");
}
void free_thread_info(struct thread_info *ti)
task_xstate_cachep =
kmem_cache_create("task_xstate", xstate_size,
__alignof__(union thread_xstate),
- SLAB_PANIC, NULL);
+ SLAB_PANIC | SLAB_NOTRACK, NULL);
}
/*
+ * Free current thread data structures etc..
+ */
+void exit_thread(void)
+{
+ struct task_struct *me = current;
+ struct thread_struct *t = &me->thread;
+ unsigned long *bp = t->io_bitmap_ptr;
+
+ if (bp) {
+ struct tss_struct *tss = &per_cpu(init_tss, get_cpu());
+
+ t->io_bitmap_ptr = NULL;
+ clear_thread_flag(TIF_IO_BITMAP);
+ /*
+ * Careful, clear this in the TSS too:
+ */
+ memset(tss->io_bitmap, 0xff, t->io_bitmap_max);
+ t->io_bitmap_max = 0;
+ put_cpu();
+ kfree(bp);
+ }
+}
+
+void flush_thread(void)
+{
+ struct task_struct *tsk = current;
+
+#ifdef CONFIG_X86_64
+ if (test_tsk_thread_flag(tsk, TIF_ABI_PENDING)) {
+ clear_tsk_thread_flag(tsk, TIF_ABI_PENDING);
+ if (test_tsk_thread_flag(tsk, TIF_IA32)) {
+ clear_tsk_thread_flag(tsk, TIF_IA32);
+ } else {
+ set_tsk_thread_flag(tsk, TIF_IA32);
+ current_thread_info()->status |= TS_COMPAT;
+ }
+ }
+#endif
+
+ clear_tsk_thread_flag(tsk, TIF_DEBUG);
+
+ tsk->thread.debugreg0 = 0;
+ tsk->thread.debugreg1 = 0;
+ tsk->thread.debugreg2 = 0;
+ tsk->thread.debugreg3 = 0;
+ tsk->thread.debugreg6 = 0;
+ tsk->thread.debugreg7 = 0;
+ memset(tsk->thread.tls_array, 0, sizeof(tsk->thread.tls_array));
+ /*
+ * Forget coprocessor state..
+ */
+ tsk->fpu_counter = 0;
+ clear_fpu(tsk);
+ clear_used_math();
+}
+
+static void hard_disable_TSC(void)
+{
+ write_cr4(read_cr4() | X86_CR4_TSD);
+}
+
+void disable_TSC(void)
+{
+ preempt_disable();
+ if (!test_and_set_thread_flag(TIF_NOTSC))
+ /*
+ * Must flip the CPU state synchronously with
+ * TIF_NOTSC in the current running context.
+ */
+ hard_disable_TSC();
+ preempt_enable();
+}
+
+static void hard_enable_TSC(void)
+{
+ write_cr4(read_cr4() & ~X86_CR4_TSD);
+}
+
+static void enable_TSC(void)
+{
+ preempt_disable();
+ if (test_and_clear_thread_flag(TIF_NOTSC))
+ /*
+ * Must flip the CPU state synchronously with
+ * TIF_NOTSC in the current running context.
+ */
+ hard_enable_TSC();
+ preempt_enable();
+}
+
+int get_tsc_mode(unsigned long adr)
+{
+ unsigned int val;
+
+ if (test_thread_flag(TIF_NOTSC))
+ val = PR_TSC_SIGSEGV;
+ else
+ val = PR_TSC_ENABLE;
+
+ return put_user(val, (unsigned int __user *)adr);
+}
+
+int set_tsc_mode(unsigned int val)
+{
+ if (val == PR_TSC_SIGSEGV)
+ disable_TSC();
+ else if (val == PR_TSC_ENABLE)
+ enable_TSC();
+ else
+ return -EINVAL;
+
+ return 0;
+}
+
+void __switch_to_xtra(struct task_struct *prev_p, struct task_struct *next_p,
+ struct tss_struct *tss)
+{
+ struct thread_struct *prev, *next;
+
+ prev = &prev_p->thread;
+ next = &next_p->thread;
+
+ if (test_tsk_thread_flag(next_p, TIF_DS_AREA_MSR) ||
+ test_tsk_thread_flag(prev_p, TIF_DS_AREA_MSR))
+ ds_switch_to(prev_p, next_p);
+ else if (next->debugctlmsr != prev->debugctlmsr)
+ update_debugctlmsr(next->debugctlmsr);
+
+ if (test_tsk_thread_flag(next_p, TIF_DEBUG)) {
+ set_debugreg(next->debugreg0, 0);
+ set_debugreg(next->debugreg1, 1);
+ set_debugreg(next->debugreg2, 2);
+ set_debugreg(next->debugreg3, 3);
+ /* no 4 and 5 */
+ set_debugreg(next->debugreg6, 6);
+ set_debugreg(next->debugreg7, 7);
+ }
+
+ if (test_tsk_thread_flag(prev_p, TIF_NOTSC) ^
+ test_tsk_thread_flag(next_p, TIF_NOTSC)) {
+ /* prev and next are different */
+ if (test_tsk_thread_flag(next_p, TIF_NOTSC))
+ hard_disable_TSC();
+ else
+ hard_enable_TSC();
+ }
+
+ if (test_tsk_thread_flag(next_p, TIF_IO_BITMAP)) {
+ /*
+ * Copy the relevant range of the IO bitmap.
+ * Normally this is 128 bytes or less:
+ */
+ memcpy(tss->io_bitmap, next->io_bitmap_ptr,
+ max(prev->io_bitmap_max, next->io_bitmap_max));
+ } else if (test_tsk_thread_flag(prev_p, TIF_IO_BITMAP)) {
+ /*
+ * Clear any possible leftover bits:
+ */
+ memset(tss->io_bitmap, 0xff, prev->io_bitmap_max);
+ }
+ propagate_user_return_notify(prev_p, next_p);
+}
+
+int sys_fork(struct pt_regs *regs)
+{
+ return do_fork(SIGCHLD, regs->sp, regs, 0, NULL, NULL);
+}
+
+/*
+ * This is trivial, and on the face of it looks like it
+ * could equally well be done in user mode.
+ *
+ * Not so, for quite unobvious reasons - register pressure.
+ * In user mode vfork() cannot have a stack frame, and if
+ * done by calling the "clone()" system call directly, you
+ * do not have enough call-clobbered registers to hold all
+ * the information you need.
+ */
+int sys_vfork(struct pt_regs *regs)
+{
+ return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, regs->sp, regs, 0,
+ NULL, NULL);
+}
+
+
+/*
* Idle related variables and functions
*/
unsigned long boot_option_idle_override = 0;
void default_idle(void)
{
if (hlt_use_halt()) {
+ trace_power_start(POWER_CSTATE, 1);
current_thread_info()->status &= ~TS_POLLING;
/*
* TS_POLLING-cleared state must be visible before we
EXPORT_SYMBOL(default_idle);
#endif
+void stop_this_cpu(void *dummy)
+{
+ local_irq_disable();
+ /*
+ * Remove this CPU:
+ */
+ set_cpu_online(smp_processor_id(), false);
+ disable_local_APIC();
+
+ for (;;) {
+ if (hlt_works(smp_processor_id()))
+ halt();
+ }
+}
+
static void do_nothing(void *unused)
{
}
{
smp_mb();
/* kick all the CPUs so that they exit out of pm_idle */
- smp_call_function(do_nothing, NULL, 0, 1);
+ smp_call_function(do_nothing, NULL, 1);
}
EXPORT_SYMBOL_GPL(cpu_idle_wait);
*/
void mwait_idle_with_hints(unsigned long ax, unsigned long cx)
{
+ trace_power_start(POWER_CSTATE, (ax>>4)+1);
if (!need_resched()) {
+ if (cpu_has(¤t_cpu_data, X86_FEATURE_CLFLUSH_MONITOR))
+ clflush((void *)¤t_thread_info()->flags);
+
__monitor((void *)¤t_thread_info()->flags, 0, 0);
smp_mb();
if (!need_resched())
static void mwait_idle(void)
{
if (!need_resched()) {
+ trace_power_start(POWER_CSTATE, 1);
+ if (cpu_has(¤t_cpu_data, X86_FEATURE_CLFLUSH_MONITOR))
+ clflush((void *)¤t_thread_info()->flags);
+
__monitor((void *)¤t_thread_info()->flags, 0, 0);
smp_mb();
if (!need_resched())
*/
static void poll_idle(void)
{
+ trace_power_start(POWER_CSTATE, 0);
local_irq_enable();
- cpu_relax();
+ while (!need_resched())
+ cpu_relax();
+ trace_power_end(0);
}
/*
*
* idle=mwait overrides this decision and forces the usage of mwait.
*/
+static int __cpuinitdata force_mwait;
#define MWAIT_INFO 0x05
#define MWAIT_ECX_EXTENDED_INFO 0x01
return 1;
}
+static cpumask_var_t c1e_mask;
+static int c1e_detected;
+
+void c1e_remove_cpu(int cpu)
+{
+ if (c1e_mask != NULL)
+ cpumask_clear_cpu(cpu, c1e_mask);
+}
+
/*
* C1E aware idle routine. We check for C1E active in the interrupt
* pending message MSR. If we detect C1E, then we handle it the same
*/
static void c1e_idle(void)
{
- static cpumask_t c1e_mask = CPU_MASK_NONE;
- static int c1e_detected;
-
if (need_resched())
return;
rdmsr(MSR_K8_INT_PENDING_MSG, lo, hi);
if (lo & K8_INTP_C1E_ACTIVE_MASK) {
c1e_detected = 1;
- mark_tsc_unstable("TSC halt in C1E");
- printk(KERN_INFO "System has C1E enabled\n");
+ if (!boot_cpu_has(X86_FEATURE_NONSTOP_TSC))
+ mark_tsc_unstable("TSC halt in AMD C1E");
+ printk(KERN_INFO "System has AMD C1E enabled\n");
+ set_cpu_cap(&boot_cpu_data, X86_FEATURE_AMDC1E);
}
}
if (c1e_detected) {
int cpu = smp_processor_id();
- if (!cpu_isset(cpu, c1e_mask)) {
- cpu_set(cpu, c1e_mask);
+ if (!cpumask_test_cpu(cpu, c1e_mask)) {
+ cpumask_set_cpu(cpu, c1e_mask);
/*
- * Force broadcast so ACPI can not interfere. Needs
- * to run with interrupts enabled as it uses
- * smp_function_call.
+ * Force broadcast so ACPI can not interfere.
*/
- local_irq_enable();
clockevents_notify(CLOCK_EVT_NOTIFY_BROADCAST_FORCE,
&cpu);
printk(KERN_INFO "Switch to broadcast mode on CPU%d\n",
cpu);
- local_irq_disable();
}
clockevents_notify(CLOCK_EVT_NOTIFY_BROADCAST_ENTER, &cpu);
void __cpuinit select_idle_routine(const struct cpuinfo_x86 *c)
{
-#ifdef CONFIG_X86_SMP
+#ifdef CONFIG_SMP
if (pm_idle == poll_idle && smp_num_siblings > 1) {
printk(KERN_WARNING "WARNING: polling idle and HT enabled,"
" performance may degrade.\n");
pm_idle = default_idle;
}
+void __init init_c1e_mask(void)
+{
+ /* If we're using c1e_idle, we need to allocate c1e_mask. */
+ if (pm_idle == c1e_idle)
+ zalloc_cpumask_var(&c1e_mask, GFP_KERNEL);
+}
+
static int __init idle_setup(char *str)
{
+ if (!str)
+ return -EINVAL;
+
if (!strcmp(str, "poll")) {
printk("using polling idle threads.\n");
pm_idle = poll_idle;
} else if (!strcmp(str, "mwait"))
force_mwait = 1;
- else
+ else if (!strcmp(str, "halt")) {
+ /*
+ * When the boot option of idle=halt is added, halt is
+ * forced to be used for CPU idle. In such case CPU C2/C3
+ * won't be used again.
+ * To continue to load the CPU idle driver, don't touch
+ * the boot_option_idle_override.
+ */
+ pm_idle = default_idle;
+ idle_halt = 1;
+ return 0;
+ } else if (!strcmp(str, "nomwait")) {
+ /*
+ * If the boot option of "idle=nomwait" is added,
+ * it means that mwait will be disabled for CPU C2/C3
+ * states. In such case it won't touch the variable
+ * of boot_option_idle_override.
+ */
+ idle_nomwait = 1;
+ return 0;
+ } else
return -1;
boot_option_idle_override = 1;
}
early_param("idle", idle_setup);
+unsigned long arch_align_stack(unsigned long sp)
+{
+ if (!(current->personality & ADDR_NO_RANDOMIZE) && randomize_va_space)
+ sp -= get_random_int() % 8192;
+ return sp & ~0xf;
+}
+
+unsigned long arch_randomize_brk(struct mm_struct *mm)
+{
+ unsigned long range_end = mm->brk + 0x02000000;
+ return randomize_range(mm->brk, range_end, 0) ? : mm->brk;
+}
+
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff