* Switch APIC to driver model
@ 2003-03-03 22:48 Pavel Machek
0 siblings, 0 replies; 2+ messages in thread
From: Pavel Machek @ 2003-03-03 22:48 UTC (permalink / raw)
To: torvalds, kernel list
Hi!
This switches to driver model, making suspend-to-ram possible. Please
apply,
Pavel
--- clean/arch/i386/kernel/apic.c 2003-02-28 15:10:01.000000000 +0100
+++ linux/arch/i386/kernel/apic.c 2003-02-28 15:33:45.000000000 +0100
@@ -10,6 +10,8 @@
* for testing these extensively.
* Maciej W. Rozycki : Various updates and fixes.
* Mikael Pettersson : Power Management for UP-APIC.
+ * Pavel Machek and
+ * Mikael Pettersson : Converted to driver model.
*/
#include <linux/config.h>
@@ -23,6 +25,10 @@
#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>
@@ -77,7 +83,7 @@
return maxlvt;
}
-void clear_local_APIC(void)
+void clear_lapic(void)
{
int maxlvt;
unsigned long v;
@@ -143,7 +149,7 @@
/*
* Do not trust the local APIC being empty at bootup.
*/
- clear_local_APIC();
+ clear_lapic();
/*
* PIC mode, enable APIC mode in the IMCR, i.e.
* connect BSP's local APIC to INT and NMI lines.
@@ -169,11 +175,11 @@
}
}
-void disable_local_APIC(void)
+void disable_lapic(void)
{
unsigned long value;
- clear_local_APIC();
+ clear_lapic();
/*
* Disable APIC (implies clearing of registers
@@ -189,7 +195,7 @@
* Check these against your board if the CPUs aren't getting
* started for no apparent reason.
*/
-int __init verify_local_APIC(void)
+int __init verify_lapic(void)
{
unsigned int reg0, reg1;
@@ -279,7 +285,7 @@
/*
* Do not trust the local APIC being empty at bootup.
*/
- clear_local_APIC();
+ clear_lapic();
/*
* Enable APIC.
@@ -304,7 +310,28 @@
apic_write_around(APIC_LVT1, value);
}
-void __init setup_local_APIC (void)
+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_lapic (void)
{
unsigned long value, ver, maxlvt;
@@ -445,46 +472,24 @@
printk("No ESR for 82489DX.\n");
}
- if (nmi_watchdog == NMI_LOCAL_APIC)
- setup_apic_nmi_watchdog();
+ if (nmi_watchdog == NMI_LOCAL_APIC) {
+ enable_lapic_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 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);
@@ -500,18 +505,26 @@
apic_pm_state.apic_thmr = apic_read(APIC_LVTTHMR);
local_irq_save(flags);
- disable_local_APIC();
+ disable_lapic();
rdmsr(MSR_IA32_APICBASE, l, h);
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;
+
+ set_fixmap_nocache(FIX_APIC_BASE, APIC_DEFAULT_PHYS_BASE); /* FIXME: this is needed for S3 resume, but why? */
+
local_irq_save(flags);
rdmsr(MSR_IA32_APICBASE, l, h);
l &= ~MSR_IA32_APICBASE_BASE;
@@ -536,74 +549,35 @@
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 lapic_driver = {
+ .name = "apic",
+ .bus = &system_bus_type,
+ .resume = lapic_resume,
+ .suspend = lapic_suspend,
+};
+
+/* not static, needed by child devices */
+struct sys_device device_lapic = {
+ .name = "apic",
+ .id = 0,
+ .dev = {
+ .name = "lapic",
+ .driver = &lapic_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(&lapic_driver);
if (apic_pm_state.active)
- pm_register(PM_SYS_DEV, 0, apic_pm_callback);
+ return sys_device_register(&device_lapic);
+ 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 */
/*
@@ -669,9 +643,6 @@
nmi_watchdog = NMI_LOCAL_APIC;
printk("Found and enabled local APIC!\n");
-
- apic_pm_init1();
-
return 0;
no_apic:
@@ -682,7 +653,6 @@
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
@@ -1149,15 +1119,13 @@
return -1;
}
- verify_local_APIC();
+ verify_lapic();
connect_bsp_APIC();
phys_cpu_present_map = 1 << boot_cpu_physical_apicid;
- apic_pm_init2();
-
- setup_local_APIC();
+ setup_lapic();
if (nmi_watchdog == NMI_LOCAL_APIC)
check_nmi_watchdog();
--- clean/arch/i386/kernel/apm.c 2003-02-28 15:10:01.000000000 +0100
+++ linux/arch/i386/kernel/apm.c 2003-02-28 15:33:45.000000000 +0100
@@ -1237,6 +1237,10 @@
}
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);
@@ -1257,6 +1261,7 @@
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:
@@ -1370,6 +1375,7 @@
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);
}
--- clean/arch/i386/kernel/nmi.c 2003-02-28 15:10:04.000000000 +0100
+++ linux/arch/i386/kernel/nmi.c 2003-02-28 15:33:45.000000000 +0100
@@ -9,6 +9,8 @@
* 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>
@@ -20,6 +22,8 @@
#include <linux/interrupt.h>
#include <linux/mc146818rtc.h>
#include <linux/kernel_stat.h>
+#include <linux/device.h>
+#include <linux/module.h>
#include <asm/smp.h>
#include <asm/mtrr.h>
@@ -29,6 +33,7 @@
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)
@@ -117,7 +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) &&
@@ -134,14 +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_lapic_nmi_watchdog(void)
{
+ if (!nmi_active)
+ return;
switch (boot_cpu_data.x86_vendor) {
case X86_VENDOR_AMD:
wrmsr(MSR_K7_EVNTSEL0, 0, 0);
@@ -158,46 +160,60 @@
}
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_POWER_DOWN)
+ return 0;
+
+ disable_lapic_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)
+ enable_lapic_nmi_watchdog();
+
+ return 0;
}
-#define __pminit /*empty*/
-#else /* CONFIG_PM */
+static struct device_driver nmi_driver = {
+ .name = "lapic_nmi",
+ .bus = &system_bus_type,
+ .resume = nmi_resume,
+ .suspend = nmi_suspend,
+};
+
+static struct sys_device device_nmi = {
+ .name = "lapic_nmi",
+ .id = 0,
+ .dev = {
+ .name = "lapic_nmi",
+ .driver = &nmi_driver,
+ .parent = &device_lapic.dev,
+ }
+};
+
+extern struct sys_device device_apic;
-static inline void nmi_pm_init(void) { }
+static int __init init_nmi_devicefs(void)
+{
+ if (nmi_watchdog == NMI_LOCAL_APIC) {
+ driver_register(&nmi_driver);
+ return sys_device_register(&device_nmi);
+ }
+}
-#define __pminit __init
+late_initcall(init_nmi_devicefs);
#endif /* CONFIG_PM */
@@ -206,7 +222,7 @@
* 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;
@@ -214,7 +230,7 @@
wrmsr(base+i, 0, 0);
}
-static void __pminit setup_k7_watchdog(void)
+static void setup_k7_watchdog(void)
{
unsigned int evntsel;
@@ -236,7 +252,7 @@
wrmsr(MSR_K7_EVNTSEL0, evntsel, 0);
}
-static void __pminit setup_p6_watchdog(void)
+static void setup_p6_watchdog(void)
{
unsigned int evntsel;
@@ -258,7 +274,7 @@
wrmsr(MSR_P6_EVNTSEL0, evntsel, 0);
}
-static int __pminit setup_p4_watchdog(void)
+static int setup_p4_watchdog(void)
{
unsigned int misc_enable, dummy;
@@ -288,7 +304,7 @@
return 1;
}
-void __pminit setup_apic_nmi_watchdog (void)
+void enable_lapic_nmi_watchdog (void)
{
switch (boot_cpu_data.x86_vendor) {
case X86_VENDOR_AMD:
@@ -312,7 +328,7 @@
default:
return;
}
- nmi_pm_init();
+ nmi_active = 1;
}
static spinlock_t nmi_print_lock = SPIN_LOCK_UNLOCKED;
@@ -400,3 +416,7 @@
wrmsr(nmi_perfctr_msr, -(cpu_khz/nmi_hz*1000), -1);
}
}
+
+EXPORT_SYMBOL(nmi_watchdog);
+EXPORT_SYMBOL(enable_lapic_nmi_watchdog);
+EXPORT_SYMBOL(disable_lapic_nmi_watchdog);
--- clean/arch/i386/oprofile/nmi_int.c 2003-02-28 15:10:22.000000000 +0100
+++ linux/arch/i386/oprofile/nmi_int.c 2003-02-26 21:19:10.000000000 +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 +66,41 @@
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_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,
+};
static int nmi_setup(void)
{
@@ -95,13 +109,27 @@
* without actually triggering any NMIs as this will
* break the core code horrifically.
*/
+ if (nmi_watchdog == NMI_LOCAL_APIC) {
+ disable_lapic_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)
+{
+ if (nmi_watchdog == NMI_LOCAL_APIC) {
+ printk("Registering oprofile-nmi\n");
+ driver_register(&nmi_driver);
+ device_register(&device_nmi);
+ }
}
+late_initcall(init_nmi_driverfs);
static void nmi_restore_registers(struct op_msrs * msrs)
{
@@ -146,10 +174,14 @@
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;
+ enable_lapic_nmi_watchdog();
+ }
}
--- clean/include/asm-i386/apic.h 2003-02-28 15:18:24.000000000 +0100
+++ linux/include/asm-i386/apic.h 2003-02-18 07:46:02.000000000 +0100
@@ -78,7 +78,8 @@
extern void smp_local_timer_interrupt (struct pt_regs * regs);
extern void setup_boot_APIC_clock (void);
extern void setup_secondary_APIC_clock (void);
-extern void setup_apic_nmi_watchdog (void);
+extern void enable_lapic_nmi_watchdog (void);
+extern void disable_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);
@@ -95,6 +96,9 @@
#define NMI_IO_APIC 1
#define NMI_LOCAL_APIC 2
#define NMI_INVALID 3
+#define NMI_LOCAL_APIC_SUSPENDED_BY_OPROFILE 4
+
+extern struct sys_device device_lapic;
#endif /* CONFIG_X86_LOCAL_APIC */
--
When do you have a heart between your knees?
[Johanka's followup: and *two* hearts?]
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: Switch APIC to driver model
@ 2003-03-04 1:35 Mikael Pettersson
0 siblings, 0 replies; 2+ messages in thread
From: Mikael Pettersson @ 2003-03-04 1:35 UTC (permalink / raw)
To: pavel; +Cc: linux-kernel, torvalds
On Mon, 3 Mar 2003 23:48:01 +0100, Pavel Machek wrote:
>This switches to driver model, making suspend-to-ram possible. Please
>apply,
> Pavel
>
>--- clean/arch/i386/kernel/apic.c 2003-02-28 15:10:01.000000000 +0100
>+++ linux/arch/i386/kernel/apic.c 2003-02-28 15:33:45.000000000 +0100
This version works a lot better than the previous one(s). My P4,
which suspends/resumes via apm just fine with UP_APIC, survived
two suspend/resume cycles with this patch: one synchronous
(apm --suspend), and one asynchronous (short press on power button).
Not having IDE oops in a BUG_ON() is a definite improvement.
I had to add an #include <linux/device.h> to apm.c, a patch hunk
failed in oprofile, and there are some cosmetic things I don't like.
I'll merge this with my previous version tomorrow.
/Mikael
^ permalink raw reply [flat|nested] 2+ messages in thread
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2003-03-03 22:48 Switch APIC to driver model Pavel Machek
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