* for testing these extensively.
* Maciej W. Rozycki : Various updates and fixes.
* Mikael Pettersson : Power Management for UP-APIC.
+ * Pavel Machek and
+ * Mikael Pettersson : PM converted to driver model.
*/
#include <linux/config.h>
#ifdef CONFIG_PM
-#include <linux/slab.h>
-#include <linux/pm.h>
+#include <linux/device.h>
+#include <linux/module.h>
static struct {
/* 'active' is true if the local APIC was enabled by us and
not the BIOS; this signifies that we are also responsible
for disabling it before entering apm/acpi suspend */
int active;
- /* 'perfctr_pmdev' is here because the current (2.4.1) PM
- callback system doesn't handle hierarchical dependencies */
- struct pm_dev *perfctr_pmdev;
/* r/w apic fields */
unsigned int apic_id;
unsigned int apic_taskpri;
unsigned int apic_thmr;
} apic_pm_state;
-static void apic_pm_suspend(void *data)
+static int lapic_suspend(struct device *dev, u32 state, u32 level)
{
unsigned int l, h;
unsigned long flags;
- if (apic_pm_state.perfctr_pmdev)
- pm_send(apic_pm_state.perfctr_pmdev, PM_SUSPEND, data);
+ if (level != SUSPEND_POWER_DOWN)
+ return 0;
+ if (!apic_pm_state.active)
+ return 0;
+
apic_pm_state.apic_id = apic_read(APIC_ID);
apic_pm_state.apic_taskpri = apic_read(APIC_TASKPRI);
apic_pm_state.apic_ldr = apic_read(APIC_LDR);
l &= ~MSR_IA32_APICBASE_ENABLE;
wrmsr(MSR_IA32_APICBASE, l, h);
local_irq_restore(flags);
+ return 0;
}
-static void apic_pm_resume(void *data)
+static int lapic_resume(struct device *dev, u32 level)
{
unsigned int l, h;
unsigned long flags;
+ if (level != RESUME_POWER_ON)
+ return 0;
+ if (!apic_pm_state.active)
+ return 0;
+
+ /* XXX: Pavel needs this for S3 resume, but can't explain why */
+ set_fixmap_nocache(FIX_APIC_BASE, APIC_DEFAULT_PHYS_BASE);
+
local_irq_save(flags);
rdmsr(MSR_IA32_APICBASE, l, h);
l &= ~MSR_IA32_APICBASE_BASE;
apic_write(APIC_ESR, 0);
apic_read(APIC_ESR);
local_irq_restore(flags);
- if (apic_pm_state.perfctr_pmdev)
- pm_send(apic_pm_state.perfctr_pmdev, PM_RESUME, data);
-}
-
-static int apic_pm_callback(struct pm_dev *dev, pm_request_t rqst, void *data)
-{
- switch (rqst) {
- case PM_SUSPEND:
- apic_pm_suspend(data);
- break;
- case PM_RESUME:
- apic_pm_resume(data);
- break;
- }
return 0;
}
-/* perfctr driver should call this instead of pm_register() */
-struct pm_dev *apic_pm_register(pm_dev_t type,
- unsigned long id,
- pm_callback callback)
-{
- struct pm_dev *dev;
-
- if (!apic_pm_state.active)
- return pm_register(type, id, callback);
- if (apic_pm_state.perfctr_pmdev)
- return NULL; /* we're busy */
- dev = kmalloc(sizeof(struct pm_dev), GFP_KERNEL);
- if (dev) {
- memset(dev, 0, sizeof(*dev));
- dev->type = type;
- dev->id = id;
- dev->callback = callback;
- apic_pm_state.perfctr_pmdev = dev;
- }
- return dev;
-}
-
-/* perfctr driver should call this instead of pm_unregister() */
-void apic_pm_unregister(struct pm_dev *dev)
+static struct device_driver lapic_driver = {
+ .name = "lapic",
+ .bus = &system_bus_type,
+ .resume = lapic_resume,
+ .suspend = lapic_suspend,
+};
+
+/* not static, needed by child devices */
+struct sys_device device_lapic = {
+ .name = "lapic",
+ .id = 0,
+ .dev = {
+ .name = "lapic",
+ .driver = &lapic_driver,
+ },
+};
+EXPORT_SYMBOL(device_lapic);
+
+static void __init apic_pm_activate(void)
{
- if (!apic_pm_state.active) {
- pm_unregister(dev);
- } else if (dev == apic_pm_state.perfctr_pmdev) {
- apic_pm_state.perfctr_pmdev = NULL;
- kfree(dev);
- }
-}
-
-static void __init apic_pm_init1(void)
-{
- /* can't pm_register() at this early stage in the boot process
- (causes an immediate reboot), so just set the flag */
apic_pm_state.active = 1;
}
-static void __init apic_pm_init2(void)
+static int __init init_lapic_devicefs(void)
{
- if (apic_pm_state.active)
- pm_register(PM_SYS_DEV, 0, apic_pm_callback);
+ if (!cpu_has_apic)
+ return 0;
+ /* XXX: remove suspend/resume procs if !apic_pm_state.active? */
+ driver_register(&lapic_driver);
+ return sys_device_register(&device_lapic);
}
+device_initcall(init_lapic_devicefs);
#else /* CONFIG_PM */
-static inline void apic_pm_init1(void) { }
-static inline void apic_pm_init2(void) { }
+static inline void apic_pm_activate(void) { }
#endif /* CONFIG_PM */
printk("Found and enabled local APIC!\n");
- apic_pm_init1();
+ apic_pm_activate();
return 0;
phys_cpu_present_map = 1 << boot_cpu_physical_apicid;
- apic_pm_init2();
-
setup_local_APIC();
if (nmi_watchdog == NMI_LOCAL_APIC)
#include <linux/time.h>
#include <linux/sched.h>
#include <linux/pm.h>
+#include <linux/device.h>
#include <linux/kernel.h>
#include <linux/smp.h>
#include <linux/smp_lock.h>
}
printk(KERN_CRIT "apm: suspend was vetoed, but suspending anyway.\n");
}
+
+ device_suspend(3, SUSPEND_POWER_DOWN);
+
/* serialize with the timer interrupt */
write_seqlock_irq(&xtime_lock);
if (err != APM_SUCCESS)
apm_error("suspend", err);
err = (err == APM_SUCCESS) ? 0 : -EIO;
+ device_resume(RESUME_POWER_ON);
pm_send_all(PM_RESUME, (void *)0);
queue_event(APM_NORMAL_RESUME, NULL);
out:
write_seqlock_irq(&xtime_lock);
set_time();
write_sequnlock_irq(&xtime_lock);
+ device_resume(RESUME_POWER_ON);
pm_send_all(PM_RESUME, (void *)0);
queue_event(event, NULL);
}
EXPORT_SYMBOL(flush_tlb_page);
#endif
-#if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_PM)
-EXPORT_SYMBOL_GPL(set_nmi_pm_callback);
-EXPORT_SYMBOL_GPL(unset_nmi_pm_callback);
-#endif
#ifdef CONFIG_X86_IO_APIC
EXPORT_SYMBOL(IO_APIC_get_PCI_irq_vector);
#endif
* Mikael Pettersson : AMD K7 support for local APIC NMI watchdog.
* Mikael Pettersson : Power Management for local APIC NMI watchdog.
* Mikael Pettersson : Pentium 4 support for local APIC NMI watchdog.
+ * Pavel Machek and
+ * Mikael Pettersson : PM converted to driver model. Disable/enable API.
*/
#include <linux/config.h>
#include <linux/interrupt.h>
#include <linux/mc146818rtc.h>
#include <linux/kernel_stat.h>
+#include <linux/module.h>
#include <asm/smp.h>
#include <asm/mtrr.h>
__setup("nmi_watchdog=", setup_nmi_watchdog);
-#ifdef CONFIG_PM
-
-#include <linux/pm.h>
-
-struct pm_dev *nmi_pmdev;
+/* nmi_active:
+ * +1: the lapic NMI watchdog is active, but can be disabled
+ * 0: the lapic NMI watchdog has not been set up, and cannot
+ * be enabled
+ * -1: the lapic NMI watchdog is disabled, but can be enabled
+ */
+static int nmi_active;
-static void disable_apic_nmi_watchdog(void)
+void disable_lapic_nmi_watchdog(void)
{
+ if (nmi_active <= 0)
+ return;
switch (boot_cpu_data.x86_vendor) {
case X86_VENDOR_AMD:
wrmsr(MSR_K7_EVNTSEL0, 0, 0);
}
break;
}
+ nmi_active = -1;
+ /* tell do_nmi() and others that we're not active any more */
+ nmi_watchdog = 0;
}
-static int nmi_pm_callback(struct pm_dev *dev, pm_request_t rqst, void *data)
+void enable_lapic_nmi_watchdog(void)
{
- switch (rqst) {
- case PM_SUSPEND:
- disable_apic_nmi_watchdog();
- break;
- case PM_RESUME:
+ if (nmi_active < 0) {
+ nmi_watchdog = NMI_LOCAL_APIC;
setup_apic_nmi_watchdog();
- break;
}
- return 0;
}
-struct pm_dev * set_nmi_pm_callback(pm_callback callback)
+#ifdef CONFIG_PM
+
+#include <linux/device.h>
+
+static int lapic_nmi_suspend(struct device *dev, u32 state, u32 level)
{
- apic_pm_unregister(nmi_pmdev);
- return apic_pm_register(PM_SYS_DEV, 0, callback);
+ if (level != SUSPEND_POWER_DOWN)
+ return 0;
+ disable_lapic_nmi_watchdog();
+ return 0;
}
-void unset_nmi_pm_callback(struct pm_dev * dev)
+static int lapic_nmi_resume(struct device *dev, u32 level)
{
- apic_pm_unregister(dev);
- nmi_pmdev = apic_pm_register(PM_SYS_DEV, 0, nmi_pm_callback);
+ if (level != RESUME_POWER_ON)
+ return 0;
+ enable_lapic_nmi_watchdog();
+ return 0;
}
-
-static void nmi_pm_init(void)
+
+static struct device_driver lapic_nmi_driver = {
+ .name = "lapic_nmi",
+ .bus = &system_bus_type,
+ .resume = lapic_nmi_resume,
+ .suspend = lapic_nmi_suspend,
+};
+
+static struct sys_device device_lapic_nmi = {
+ .name = "lapic_nmi",
+ .id = 0,
+ .dev = {
+ .name = "lapic_nmi",
+ .driver = &lapic_nmi_driver,
+ .parent = &device_lapic.dev,
+ },
+};
+
+static int __init init_lapic_nmi_devicefs(void)
{
- if (!nmi_pmdev)
- nmi_pmdev = apic_pm_register(PM_SYS_DEV, 0, nmi_pm_callback);
+ if (nmi_active == 0)
+ return 0;
+ driver_register(&lapic_nmi_driver);
+ return sys_device_register(&device_lapic_nmi);
}
-
-#define __pminit /*empty*/
-
-#else /* CONFIG_PM */
-
-static inline void nmi_pm_init(void) { }
-
-#define __pminit __init
+/* must come after the local APIC's device_initcall() */
+late_initcall(init_lapic_nmi_devicefs);
#endif /* CONFIG_PM */
* Original code written by Keith Owens.
*/
-static void __pminit clear_msr_range(unsigned int base, unsigned int n)
+static void clear_msr_range(unsigned int base, unsigned int n)
{
unsigned int i;
wrmsr(base+i, 0, 0);
}
-static void __pminit setup_k7_watchdog(void)
+static void setup_k7_watchdog(void)
{
unsigned int evntsel;
wrmsr(MSR_K7_EVNTSEL0, evntsel, 0);
}
-static void __pminit setup_p6_watchdog(void)
+static void setup_p6_watchdog(void)
{
unsigned int evntsel;
wrmsr(MSR_P6_EVNTSEL0, evntsel, 0);
}
-static int __pminit setup_p4_watchdog(void)
+static int setup_p4_watchdog(void)
{
unsigned int misc_enable, dummy;
return 1;
}
-void __pminit setup_apic_nmi_watchdog (void)
+void setup_apic_nmi_watchdog (void)
{
switch (boot_cpu_data.x86_vendor) {
case X86_VENDOR_AMD:
default:
return;
}
- nmi_pm_init();
+ nmi_active = 1;
}
static spinlock_t nmi_print_lock = SPIN_LOCK_UNLOCKED;
wrmsr(nmi_perfctr_msr, -(cpu_khz/nmi_hz*1000), -1);
}
}
+
+EXPORT_SYMBOL(nmi_watchdog);
+EXPORT_SYMBOL(disable_lapic_nmi_watchdog);
+EXPORT_SYMBOL(enable_lapic_nmi_watchdog);
#include <linux/notifier.h>
#include <linux/smp.h>
#include <linux/oprofile.h>
+#include <linux/device.h>
#include <asm/nmi.h>
#include <asm/msr.h>
#include <asm/apic.h>
static int nmi_start(void);
static void nmi_stop(void);
-static struct pm_dev * oprofile_pmdev;
-
-/* We're at risk of causing big trouble unless we
- * make sure to not cause any NMI interrupts when
- * suspended.
- */
-static int oprofile_pm_callback(struct pm_dev * dev,
- pm_request_t rqst, void * data)
+/* 0 == registered but off, 1 == registered and on */
+static int nmi_enabled = 0;
+
+#ifdef CONFIG_PM
+
+static int nmi_suspend(struct device *dev, u32 state, u32 level)
{
- switch (rqst) {
- case PM_SUSPEND:
- nmi_stop();
- break;
- case PM_RESUME:
- nmi_start();
- break;
- }
+ if (level != SUSPEND_POWER_DOWN)
+ return 0;
+ if (nmi_enabled == 1)
+ nmi_stop();
return 0;
}
-
-
+
+
+static int nmi_resume(struct device *dev, u32 level)
+{
+ if (level != RESUME_POWER_ON)
+ return 0;
+ if (nmi_enabled == 1)
+ nmi_start();
+ return 0;
+}
+
+
+static struct device_driver nmi_driver = {
+ .name = "oprofile",
+ .bus = &system_bus_type,
+ .resume = nmi_resume,
+ .suspend = nmi_suspend,
+};
+
+
+static struct device device_nmi = {
+ .name = "oprofile",
+ .bus_id = "oprofile",
+ .driver = &nmi_driver,
+ .parent = &device_lapic.dev,
+};
+
+
+static int __init init_nmi_driverfs(void)
+{
+ driver_register(&nmi_driver);
+ return device_register(&device_nmi);
+}
+
+
+late_initcall(init_nmi_driverfs);
+
+#endif /* CONFIG_PM */
+
+
static int nmi_callback(struct pt_regs * regs, int cpu)
{
return model->check_ctrs(cpu, &cpu_msrs[cpu], regs);
saved_lvtpc[cpu] = apic_read(APIC_LVTPC);
apic_write(APIC_LVTPC, APIC_DM_NMI);
}
-
+
static int nmi_setup(void)
{
* without actually triggering any NMIs as this will
* break the core code horrifically.
*/
+ disable_lapic_nmi_watchdog();
on_each_cpu(nmi_cpu_setup, NULL, 0, 1);
set_nmi_callback(nmi_callback);
- oprofile_pmdev = set_nmi_pm_callback(oprofile_pm_callback);
+ nmi_enabled = 1;
return 0;
}
static void nmi_shutdown(void)
{
- unset_nmi_pm_callback(oprofile_pmdev);
+ nmi_enabled = 0;
unset_nmi_callback();
on_each_cpu(nmi_cpu_shutdown, NULL, 0, 1);
+ enable_lapic_nmi_watchdog();
}
extern void setup_boot_APIC_clock (void);
extern void setup_secondary_APIC_clock (void);
extern void setup_apic_nmi_watchdog (void);
+extern void disable_lapic_nmi_watchdog(void);
+extern void enable_lapic_nmi_watchdog(void);
extern inline void nmi_watchdog_tick (struct pt_regs * regs);
extern int APIC_init_uniprocessor (void);
extern void disable_APIC_timer(void);
extern void enable_APIC_timer(void);
-extern struct pm_dev *apic_pm_register(pm_dev_t, unsigned long, pm_callback);
-extern void apic_pm_unregister(struct pm_dev*);
+#ifdef CONFIG_PM
+extern struct sys_device device_lapic;
+#endif
extern int check_nmi_watchdog (void);
extern void enable_NMI_through_LVT0 (void * dummy);
*/
void unset_nmi_callback(void);
-#ifdef CONFIG_PM
-
-/** Replace the PM callback routine for NMI. */
-struct pm_dev * set_nmi_pm_callback(pm_callback callback);
-
-/** Unset the PM callback routine back to the default. */
-void unset_nmi_pm_callback(struct pm_dev * dev);
-
-#else
-
-static inline struct pm_dev * set_nmi_pm_callback(pm_callback callback)
-{
- return 0;
-}
-
-static inline void unset_nmi_pm_callback(struct pm_dev * dev)
-{
-}
-
-#endif /* CONFIG_PM */
-
#endif /* ASM_NMI_H */
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