Hi!
> > Yes, whole oprofile/nmi interaction is ugly like hell. This way it is
> > at least explicit, so people *know* its ugly.
>
> That's no reason not do something like Mikael or I suggested.
Well, I believe that having
extern unsigned int nmi_watchdog;
#define NMI_NONE 0
#define NMI_IO_APIC 1
#define NMI_LOCAL_APIC 2
#define NMI_INVALID 3
#define NMI_LOCAL_APIC_SUSPENDED_BY_OPROFILE 4
makes what happens there pretty explicit. Whole thing can be
controlled by single variable...
Here's new version of diff...
Pavel
--- clean/arch/i386/kernel/apic.c 2003-01-05 22:58:18.000000000 +0100
+++ linux-swsusp/arch/i386/kernel/apic.c 2003-02-10 17:03:51.000000000 +0100
@@ -10,6 +10,7 @@
* for testing these extensively.
* Maciej W. Rozycki : Various updates and fixes.
* Mikael Pettersson : Power Management for UP-APIC.
+ * Pavel Machek : Converted to driver model.
*/
#include <linux/config.h>
@@ -23,6 +24,10 @@
#include <linux/interrupt.h>
#include <linux/mc146818rtc.h>
#include <linux/kernel_stat.h>
+#include <linux/delay.h>
+#include <linux/slab.h>
+#include <linux/device.h>
+#include <linux/pm.h>
#include <asm/atomic.h>
#include <asm/smp.h>
@@ -54,6 +59,8 @@
int prof_old_multiplier[NR_CPUS] = { 1, };
int prof_counter[NR_CPUS] = { 1, };
+unsigned long apic_phys;
+
int get_maxlvt(void)
{
unsigned int v, ver, maxlvt;
@@ -292,6 +299,27 @@
apic_write_around(APIC_LVT1, value);
}
+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;
+ /* r/w apic fields */
+ unsigned int apic_id;
+ unsigned int apic_taskpri;
+ unsigned int apic_ldr;
+ unsigned int apic_dfr;
+ unsigned int apic_spiv;
+ unsigned int apic_lvtt;
+ unsigned int apic_lvtpc;
+ unsigned int apic_lvt0;
+ unsigned int apic_lvt1;
+ unsigned int apic_lvterr;
+ unsigned int apic_tmict;
+ unsigned int apic_tdcr;
+ unsigned int apic_thmr;
+} apic_pm_state;
+
void __init setup_local_APIC (void)
{
unsigned long value, ver, maxlvt;
@@ -435,44 +463,21 @@
if (nmi_watchdog == NMI_LOCAL_APIC)
setup_apic_nmi_watchdog();
+
+ apic_pm_state.active = 1;
}
#ifdef CONFIG_PM
-
-#include <linux/slab.h>
-#include <linux/pm.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_ldr;
- unsigned int apic_dfr;
- unsigned int apic_spiv;
- unsigned int apic_lvtt;
- unsigned int apic_lvtpc;
- unsigned int apic_lvt0;
- unsigned int apic_lvt1;
- unsigned int apic_lvterr;
- unsigned int apic_tmict;
- unsigned int apic_tdcr;
- unsigned int apic_thmr;
-} apic_pm_state;
-
-static void apic_pm_suspend(void *data)
+static int apic_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_DISABLE)
+ 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);
@@ -493,13 +498,21 @@
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 apic_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;
+
+ set_fixmap_nocache(FIX_APIC_BASE, apic_phys); /* FIXME: this is needed for S3 resume, but why? */
+
local_irq_save(flags);
rdmsr(MSR_IA32_APICBASE, l, h);
l &= ~MSR_IA32_APICBASE_BASE;
@@ -524,74 +537,34 @@
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;
-}
+static struct device_driver apic_driver = {
+ .name = "apic",
+ .bus = &system_bus_type,
+ .resume = apic_resume,
+ .suspend = apic_suspend,
+};
+
+struct sys_device device_apic = {
+ .name = "apic",
+ .id = 0,
+ .dev = {
+ .name = "APIC",
+ .driver = &apic_driver,
+ },
+};
-/* perfctr driver should call this instead of pm_unregister() */
-void apic_pm_unregister(struct pm_dev *dev)
-{
- 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_apic_devicefs(void)
{
+ driver_register(&apic_driver);
if (apic_pm_state.active)
- pm_register(PM_SYS_DEV, 0, apic_pm_callback);
+ return sys_device_register(&device_apic);
+ return 0;
}
-#else /* CONFIG_PM */
-
-static inline void apic_pm_init1(void) { }
-static inline void apic_pm_init2(void) { }
-
+device_initcall(init_apic_devicefs);
#endif /* CONFIG_PM */
/*
@@ -658,9 +631,6 @@
nmi_watchdog = NMI_LOCAL_APIC;
printk("Found and enabled local APIC!\n");
-
- apic_pm_init1();
-
return 0;
no_apic:
@@ -670,8 +640,6 @@
void __init init_apic_mappings(void)
{
- unsigned long apic_phys;
-
/*
* If no local APIC can be found then set up a fake all
* zeroes page to simulate the local APIC and another
@@ -1141,8 +1109,6 @@
phys_cpu_present_map = 1;
apic_write_around(APIC_ID, boot_cpu_physical_apicid);
- apic_pm_init2();
-
setup_local_APIC();
if (nmi_watchdog == NMI_LOCAL_APIC)
--- clean/arch/i386/kernel/apm.c 2003-01-09 22:16:11.000000000 +0100
+++ linux-swsusp/arch/i386/kernel/apm.c 2003-01-28 10:35:51.000000000 +0100
@@ -1263,6 +1263,11 @@
}
printk(KERN_CRIT "apm: suspend was vetoed, but suspending anyway.\n");
}
+
+ device_suspend(3, SUSPEND_NOTIFY);
+ device_suspend(3, SUSPEND_SAVE_STATE);
+ device_suspend(3, SUSPEND_DISABLE);
+
/* serialize with the timer interrupt */
write_lock_irq(&xtime_lock);
@@ -1283,6 +1288,8 @@
if (err != APM_SUCCESS)
apm_error("suspend", err);
err = (err == APM_SUCCESS) ? 0 : -EIO;
+ device_resume(RESUME_RESTORE_STATE);
+ device_resume(RESUME_ENABLE);
pm_send_all(PM_RESUME, (void *)0);
queue_event(APM_NORMAL_RESUME, NULL);
out:
@@ -1396,6 +1403,8 @@
write_lock_irq(&xtime_lock);
set_time();
write_unlock_irq(&xtime_lock);
+ device_resume(RESUME_RESTORE_STATE);
+ device_resume(RESUME_ENABLE);
pm_send_all(PM_RESUME, (void *)0);
queue_event(event, NULL);
}
--- clean/arch/i386/kernel/i386_ksyms.c 2003-01-17 23:09:51.000000000 +0100
+++ linux-swsusp/arch/i386/kernel/i386_ksyms.c 2003-01-19 19:58:34.000000000 +0100
@@ -161,10 +161,6 @@
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
--- clean/arch/i386/kernel/nmi.c 2003-01-05 22:58:19.000000000 +0100
+++ linux-swsusp/arch/i386/kernel/nmi.c 2003-02-10 17:09:14.000000000 +0100
@@ -9,6 +9,7 @@
* 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 : Driver model here, too.
*/
#include <linux/config.h>
@@ -20,6 +21,7 @@
#include <linux/interrupt.h>
#include <linux/mc146818rtc.h>
#include <linux/kernel_stat.h>
+#include <linux/device.h>
#include <asm/smp.h>
#include <asm/mtrr.h>
@@ -29,6 +31,7 @@
static unsigned int nmi_hz = HZ;
unsigned int nmi_perfctr_msr; /* the MSR to reset in NMI handler */
extern void show_registers(struct pt_regs *regs);
+static int nmi_active;
#define K7_EVNTSEL_ENABLE (1 << 22)
#define K7_EVNTSEL_INT (1 << 20)
@@ -119,7 +122,7 @@
*/
if ((nmi == NMI_LOCAL_APIC) &&
(boot_cpu_data.x86_vendor == X86_VENDOR_INTEL) &&
- (boot_cpu_data.x86 == 6 || boot_cpu_data.x86 == 15))
+ (boot_cpu_data.x86 == 6 || boot_cpu_data.x86 == 15))
nmi_watchdog = nmi;
if ((nmi == NMI_LOCAL_APIC) &&
(boot_cpu_data.x86_vendor == X86_VENDOR_AMD) &&
@@ -136,14 +139,11 @@
__setup("nmi_watchdog=", setup_nmi_watchdog);
-#ifdef CONFIG_PM
-
-#include <linux/pm.h>
-
-struct pm_dev *nmi_pmdev;
-static void disable_apic_nmi_watchdog(void)
+void disable_apic_nmi_watchdog(void)
{
+ if (!nmi_active)
+ return;
switch (boot_cpu_data.x86_vendor) {
case X86_VENDOR_AMD:
wrmsr(MSR_K7_EVNTSEL0, 0, 0);
@@ -160,46 +160,56 @@
}
break;
}
+ nmi_active = 0;
}
-static int nmi_pm_callback(struct pm_dev *dev, pm_request_t rqst, void *data)
+#ifdef CONFIG_PM
+
+static int nmi_suspend(struct device *dev, u32 state, u32 level)
{
- switch (rqst) {
- case PM_SUSPEND:
- disable_apic_nmi_watchdog();
- break;
- case PM_RESUME:
- setup_apic_nmi_watchdog();
- break;
- }
+ if (level != SUSPEND_DISABLE)
+ return 0;
+
+ disable_apic_nmi_watchdog();
return 0;
}
-struct pm_dev * set_nmi_pm_callback(pm_callback callback)
+static int nmi_resume(struct device *dev, u32 level)
{
- apic_pm_unregister(nmi_pmdev);
- return apic_pm_register(PM_SYS_DEV, 0, callback);
-}
+ if (level != RESUME_POWER_ON)
+ return 0;
-void unset_nmi_pm_callback(struct pm_dev * dev)
-{
- apic_pm_unregister(dev);
- nmi_pmdev = apic_pm_register(PM_SYS_DEV, 0, nmi_pm_callback);
-}
-
-static void nmi_pm_init(void)
-{
- if (!nmi_pmdev)
- nmi_pmdev = apic_pm_register(PM_SYS_DEV, 0, nmi_pm_callback);
+ if (nmi_watchdog == NMI_LOCAL_APIC)
+ setup_apic_nmi_watchdog();
+
+ return 0;
}
-#define __pminit /*empty*/
-#else /* CONFIG_PM */
+static struct device_driver nmi_driver = {
+ .name = "nmi",
+ .bus = &system_bus_type,
+ .resume = nmi_resume,
+ .suspend = nmi_suspend,
+};
+
+static struct device device_nmi = {
+ .name = "NMI",
+ .bus_id = "NMI",
+ .driver = &nmi_driver,
+};
+
+extern struct sys_device device_apic;
-static inline void nmi_pm_init(void) { }
+static int __init init_nmi_devicefs(void)
+{
+ driver_register(&nmi_driver);
+
+ device_nmi.parent = &device_apic.dev;
+ return device_register(&device_nmi);
+}
-#define __pminit __init
+late_initcall(init_nmi_devicefs);
#endif /* CONFIG_PM */
@@ -208,7 +218,7 @@
* 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;
@@ -216,7 +226,7 @@
wrmsr(base+i, 0, 0);
}
-static void __pminit setup_k7_watchdog(void)
+static void setup_k7_watchdog(void)
{
unsigned int evntsel;
@@ -238,7 +248,7 @@
wrmsr(MSR_K7_EVNTSEL0, evntsel, 0);
}
-static void __pminit setup_p6_watchdog(void)
+static void setup_p6_watchdog(void)
{
unsigned int evntsel;
@@ -260,7 +270,7 @@
wrmsr(MSR_P6_EVNTSEL0, evntsel, 0);
}
-static int __pminit setup_p4_watchdog(void)
+static int setup_p4_watchdog(void)
{
unsigned int misc_enable, dummy;
@@ -290,7 +300,7 @@
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:
@@ -314,7 +324,7 @@
default:
return;
}
- nmi_pm_init();
+ nmi_active = 1;
}
static spinlock_t nmi_print_lock = SPIN_LOCK_UNLOCKED;
--- clean/arch/i386/oprofile/nmi_int.c 2003-01-05 22:58:19.000000000 +0100
+++ linux-swsusp/arch/i386/oprofile/nmi_int.c 2003-02-10 17:34:38.000000000 +0100
@@ -11,6 +11,7 @@
#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>
@@ -24,27 +25,6 @@
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)
-{
- switch (rqst) {
- case PM_SUSPEND:
- nmi_stop();
- break;
- case PM_RESUME:
- nmi_start();
- break;
- }
- return 0;
-}
-
static int nmi_callback(struct pt_regs * regs, int cpu)
{
@@ -86,7 +66,42 @@
saved_lvtpc[cpu] = apic_read(APIC_LVTPC);
apic_write(APIC_LVTPC, APIC_DM_NMI);
}
-
+
+static int nmi_enabled = 0; /* 0 == registered but off, 1 == registered and on */
+
+static int nmi_suspend(struct device *dev, u32 state, u32 level)
+{
+ if (level != SUSPEND_DISABLE)
+ 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,
+};
+
+extern struct sys_device device_apic;
static int nmi_setup(void)
{
@@ -95,13 +110,25 @@
* without actually triggering any NMIs as this will
* break the core code horrifically.
*/
+ if (nmi_watchdog == NMI_LOCAL_APIC) {
+ disable_apic_nmi_watchdog();
+ nmi_watchdog = NMI_LOCAL_APIC_SUSPENDED_BY_OPROFILE;
+ }
smp_call_function(nmi_cpu_setup, NULL, 0, 1);
nmi_cpu_setup(0);
set_nmi_callback(nmi_callback);
- oprofile_pmdev = set_nmi_pm_callback(oprofile_pm_callback);
- return 0;
+ nmi_enabled = 1;
+ return 0;
}
+static int __init init_nmi_driverfs(void)
+{
+ driver_register(&nmi_driver);
+ device_nmi.parent = &device_apic.dev;
+ device_register(&device_nmi);
+}
+
+late_initcall(init_nmi_driverfs);
static void nmi_restore_registers(struct op_msrs * msrs)
{
@@ -146,10 +173,14 @@
static void nmi_shutdown(void)
{
- unset_nmi_pm_callback(oprofile_pmdev);
+ nmi_enabled = 0;
unset_nmi_callback();
smp_call_function(nmi_cpu_shutdown, NULL, 0, 1);
nmi_cpu_shutdown(0);
+ if (nmi_watchdog == NMI_LOCAL_APIC_SUSPENDED_BY_OPROFILE) {
+ nmi_watchdog = NMI_LOCAL_APIC;
+ setup_apic_nmi_watchdog();
+ }
}
--- clean/include/asm-i386/apic.h 2002-10-20 16:22:45.000000000 +0200
+++ linux-swsusp/include/asm-i386/apic.h 2003-02-09 11:46:09.000000000 +0100
@@ -95,6 +95,7 @@
#define NMI_IO_APIC 1
#define NMI_LOCAL_APIC 2
#define NMI_INVALID 3
+#define NMI_LOCAL_APIC_SUSPENDED_BY_OPROFILE 4
#endif /* CONFIG_X86_LOCAL_APIC */
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