Merge branch 'x86-idle-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull x86 idle updates from Ingo Molnar:
"There were two bigger changes in this development cycle:
- remove idle notifiers:
32 files changed, 74 insertions(+), 803 deletions(-)
These notifiers were of questionable value and the main usecase,
the i7300 driver, was essentially unmaintained and can be removed,
plus modern power management concepts don't need the callback - so
use this golden opportunity and get rid of this opaque and fragile
callback from a latency sensitive code path.
(Len Brown, Thomas Gleixner)
- improve the AMD Erratum 400 workaround that used high overhead MSR
polling in the idle loop (Borisla Petkov, Thomas Gleixner)"
* 'x86-idle-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86: Remove empty idle.h header
x86/amd: Simplify AMD E400 aware idle routine
x86/amd: Check for the C1E bug post ACPI subsystem init
x86/bugs: Separate AMD E400 erratum and C1E bug
x86/cpufeature: Provide helper to set bugs bits
x86/idle: Remove enter_idle(), exit_idle()
x86: Remove x86_test_and_clear_bit_percpu()
x86/idle: Remove is_idle flag
x86/idle: Remove idle_notifier
i7300_idle: Remove this driver
This commit is contained in:
Linus Torvalds
commit
212f30008a
|
|
@ -6104,12 +6104,6 @@ S: Maintained
|
|||
F: Documentation/cdrom/ide-cd
|
||||
F: drivers/ide/ide-cd*
|
||||
|
||||
IDLE-I7300
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M: Andy Henroid <andrew.d.henroid@intel.com>
|
||||
L: linux-pm@vger.kernel.org
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||||
S: Supported
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||||
F: drivers/idle/i7300_idle.c
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||||
|
||||
IEEE 802.15.4 SUBSYSTEM
|
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M: Alexander Aring <aar@pengutronix.de>
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M: Stefan Schmidt <stefan@osg.samsung.com>
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|
|
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|||
|
|
@ -94,7 +94,7 @@ static inline unsigned int acpi_processor_cstate_check(unsigned int max_cstate)
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boot_cpu_data.x86_model <= 0x05 &&
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boot_cpu_data.x86_mask < 0x0A)
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return 1;
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else if (amd_e400_c1e_detected)
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else if (boot_cpu_has(X86_BUG_AMD_APIC_C1E))
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return 1;
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else
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return max_cstate;
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|
|
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|||
|
|
@ -11,7 +11,6 @@
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#include <asm/fixmap.h>
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#include <asm/mpspec.h>
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#include <asm/msr.h>
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#include <asm/idle.h>
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#define ARCH_APICTIMER_STOPS_ON_C3 1
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|
|
@ -640,7 +639,6 @@ extern void irq_exit(void);
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static inline void entering_irq(void)
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{
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irq_enter();
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exit_idle();
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}
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|
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static inline void entering_ack_irq(void)
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|
|
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|||
|
|
@ -204,6 +204,7 @@ static __always_inline __pure bool _static_cpu_has(u16 bit)
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|
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#define static_cpu_has_bug(bit) static_cpu_has((bit))
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#define boot_cpu_has_bug(bit) cpu_has_bug(&boot_cpu_data, (bit))
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#define boot_cpu_set_bug(bit) set_cpu_cap(&boot_cpu_data, (bit))
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||||
|
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#define MAX_CPU_FEATURES (NCAPINTS * 32)
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#define cpu_have_feature boot_cpu_has
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|
|
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|||
|
|
@ -314,4 +314,6 @@
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|||
#define X86_BUG_NULL_SEG X86_BUG(10) /* Nulling a selector preserves the base */
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#define X86_BUG_SWAPGS_FENCE X86_BUG(11) /* SWAPGS without input dep on GS */
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#define X86_BUG_MONITOR X86_BUG(12) /* IPI required to wake up remote CPU */
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#define X86_BUG_AMD_E400 X86_BUG(13) /* CPU is among the affected by Erratum 400 */
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#endif /* _ASM_X86_CPUFEATURES_H */
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|
|
|
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|
|
@ -1,22 +0,0 @@
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#ifndef _ASM_X86_IDLE_H
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#define _ASM_X86_IDLE_H
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|
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#define IDLE_START 1
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#define IDLE_END 2
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struct notifier_block;
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void idle_notifier_register(struct notifier_block *n);
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void idle_notifier_unregister(struct notifier_block *n);
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|
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#ifdef CONFIG_X86_64
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void enter_idle(void);
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void exit_idle(void);
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#else /* !CONFIG_X86_64 */
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static inline void enter_idle(void) { }
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static inline void exit_idle(void) { }
|
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static inline void __exit_idle(void) { }
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#endif /* CONFIG_X86_64 */
|
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|
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void amd_e400_remove_cpu(int cpu);
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#endif /* _ASM_X86_IDLE_H */
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|
|
@ -507,17 +507,6 @@ do { \
|
|||
|
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#endif
|
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|
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/* This is not atomic against other CPUs -- CPU preemption needs to be off */
|
||||
#define x86_test_and_clear_bit_percpu(bit, var) \
|
||||
({ \
|
||||
bool old__; \
|
||||
asm volatile("btr %2,"__percpu_arg(1)"\n\t" \
|
||||
CC_SET(c) \
|
||||
: CC_OUT(c) (old__), "+m" (var) \
|
||||
: "dIr" (bit)); \
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||||
old__; \
|
||||
})
|
||||
|
||||
static __always_inline bool x86_this_cpu_constant_test_bit(unsigned int nr,
|
||||
const unsigned long __percpu *addr)
|
||||
{
|
||||
|
|
|
|||
|
|
@ -633,10 +633,9 @@ static inline void sync_core(void)
|
|||
}
|
||||
|
||||
extern void select_idle_routine(const struct cpuinfo_x86 *c);
|
||||
extern void init_amd_e400_c1e_mask(void);
|
||||
extern void amd_e400_c1e_apic_setup(void);
|
||||
|
||||
extern unsigned long boot_option_idle_override;
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extern bool amd_e400_c1e_detected;
|
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|
||||
enum idle_boot_override {IDLE_NO_OVERRIDE=0, IDLE_HALT, IDLE_NOMWAIT,
|
||||
IDLE_POLL};
|
||||
|
|
|
|||
|
|
@ -48,7 +48,6 @@
|
|||
#include <asm/io_apic.h>
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#include <asm/desc.h>
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#include <asm/hpet.h>
|
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#include <asm/idle.h>
|
||||
#include <asm/mtrr.h>
|
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#include <asm/time.h>
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#include <asm/smp.h>
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||||
|
|
@ -894,11 +893,13 @@ void __init setup_boot_APIC_clock(void)
|
|||
|
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/* Setup the lapic or request the broadcast */
|
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setup_APIC_timer();
|
||||
amd_e400_c1e_apic_setup();
|
||||
}
|
||||
|
||||
void setup_secondary_APIC_clock(void)
|
||||
{
|
||||
setup_APIC_timer();
|
||||
amd_e400_c1e_apic_setup();
|
||||
}
|
||||
|
||||
/*
|
||||
|
|
|
|||
|
|
@ -48,7 +48,6 @@
|
|||
#include <linux/bootmem.h>
|
||||
|
||||
#include <asm/irqdomain.h>
|
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#include <asm/idle.h>
|
||||
#include <asm/io.h>
|
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#include <asm/smp.h>
|
||||
#include <asm/cpu.h>
|
||||
|
|
|
|||
|
|
@ -20,6 +20,10 @@
|
|||
|
||||
#include "cpu.h"
|
||||
|
||||
static const int amd_erratum_383[];
|
||||
static const int amd_erratum_400[];
|
||||
static bool cpu_has_amd_erratum(struct cpuinfo_x86 *cpu, const int *erratum);
|
||||
|
||||
/*
|
||||
* nodes_per_socket: Stores the number of nodes per socket.
|
||||
* Refer to Fam15h Models 00-0fh BKDG - CPUID Fn8000_001E_ECX
|
||||
|
|
@ -592,11 +596,16 @@ static void early_init_amd(struct cpuinfo_x86 *c)
|
|||
/* F16h erratum 793, CVE-2013-6885 */
|
||||
if (c->x86 == 0x16 && c->x86_model <= 0xf)
|
||||
msr_set_bit(MSR_AMD64_LS_CFG, 15);
|
||||
}
|
||||
|
||||
static const int amd_erratum_383[];
|
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static const int amd_erratum_400[];
|
||||
static bool cpu_has_amd_erratum(struct cpuinfo_x86 *cpu, const int *erratum);
|
||||
/*
|
||||
* Check whether the machine is affected by erratum 400. This is
|
||||
* used to select the proper idle routine and to enable the check
|
||||
* whether the machine is affected in arch_post_acpi_init(), which
|
||||
* sets the X86_BUG_AMD_APIC_C1E bug depending on the MSR check.
|
||||
*/
|
||||
if (cpu_has_amd_erratum(c, amd_erratum_400))
|
||||
set_cpu_bug(c, X86_BUG_AMD_E400);
|
||||
}
|
||||
|
||||
static void init_amd_k8(struct cpuinfo_x86 *c)
|
||||
{
|
||||
|
|
@ -777,9 +786,6 @@ static void init_amd(struct cpuinfo_x86 *c)
|
|||
if (c->x86 > 0x11)
|
||||
set_cpu_cap(c, X86_FEATURE_ARAT);
|
||||
|
||||
if (cpu_has_amd_erratum(c, amd_erratum_400))
|
||||
set_cpu_bug(c, X86_BUG_AMD_APIC_C1E);
|
||||
|
||||
rdmsr_safe(MSR_AMD64_PATCH_LEVEL, &c->microcode, &dummy);
|
||||
|
||||
/* 3DNow or LM implies PREFETCHW */
|
||||
|
|
|
|||
|
|
@ -1172,7 +1172,6 @@ void enable_sep_cpu(void)
|
|||
void __init identify_boot_cpu(void)
|
||||
{
|
||||
identify_cpu(&boot_cpu_data);
|
||||
init_amd_e400_c1e_mask();
|
||||
#ifdef CONFIG_X86_32
|
||||
sysenter_setup();
|
||||
enable_sep_cpu();
|
||||
|
|
|
|||
|
|
@ -24,7 +24,6 @@
|
|||
|
||||
#include <asm/amd_nb.h>
|
||||
#include <asm/apic.h>
|
||||
#include <asm/idle.h>
|
||||
#include <asm/mce.h>
|
||||
#include <asm/msr.h>
|
||||
#include <asm/trace/irq_vectors.h>
|
||||
|
|
|
|||
|
|
@ -26,7 +26,6 @@
|
|||
|
||||
#include <asm/processor.h>
|
||||
#include <asm/apic.h>
|
||||
#include <asm/idle.h>
|
||||
#include <asm/mce.h>
|
||||
#include <asm/msr.h>
|
||||
#include <asm/trace/irq_vectors.h>
|
||||
|
|
|
|||
|
|
@ -6,7 +6,6 @@
|
|||
|
||||
#include <asm/irq_vectors.h>
|
||||
#include <asm/apic.h>
|
||||
#include <asm/idle.h>
|
||||
#include <asm/mce.h>
|
||||
#include <asm/trace/irq_vectors.h>
|
||||
|
||||
|
|
|
|||
|
|
@ -25,7 +25,6 @@
|
|||
#include <asm/hyperv.h>
|
||||
#include <asm/mshyperv.h>
|
||||
#include <asm/desc.h>
|
||||
#include <asm/idle.h>
|
||||
#include <asm/irq_regs.h>
|
||||
#include <asm/i8259.h>
|
||||
#include <asm/apic.h>
|
||||
|
|
|
|||
|
|
@ -14,7 +14,6 @@
|
|||
#include <asm/apic.h>
|
||||
#include <asm/io_apic.h>
|
||||
#include <asm/irq.h>
|
||||
#include <asm/idle.h>
|
||||
#include <asm/mce.h>
|
||||
#include <asm/hw_irq.h>
|
||||
#include <asm/desc.h>
|
||||
|
|
|
|||
|
|
@ -16,7 +16,6 @@
|
|||
#include <linux/uaccess.h>
|
||||
#include <linux/smp.h>
|
||||
#include <asm/io_apic.h>
|
||||
#include <asm/idle.h>
|
||||
#include <asm/apic.h>
|
||||
|
||||
int sysctl_panic_on_stackoverflow;
|
||||
|
|
|
|||
|
|
@ -42,7 +42,6 @@
|
|||
#include <asm/traps.h>
|
||||
#include <asm/desc.h>
|
||||
#include <asm/tlbflush.h>
|
||||
#include <asm/idle.h>
|
||||
#include <asm/apic.h>
|
||||
#include <asm/apicdef.h>
|
||||
#include <asm/hypervisor.h>
|
||||
|
|
@ -267,13 +266,11 @@ do_async_page_fault(struct pt_regs *regs, unsigned long error_code)
|
|||
case KVM_PV_REASON_PAGE_NOT_PRESENT:
|
||||
/* page is swapped out by the host. */
|
||||
prev_state = exception_enter();
|
||||
exit_idle();
|
||||
kvm_async_pf_task_wait((u32)read_cr2());
|
||||
exception_exit(prev_state);
|
||||
break;
|
||||
case KVM_PV_REASON_PAGE_READY:
|
||||
rcu_irq_enter();
|
||||
exit_idle();
|
||||
kvm_async_pf_task_wake((u32)read_cr2());
|
||||
rcu_irq_exit();
|
||||
break;
|
||||
|
|
|
|||
|
|
@ -23,7 +23,6 @@
|
|||
#include <asm/cpu.h>
|
||||
#include <asm/apic.h>
|
||||
#include <asm/syscalls.h>
|
||||
#include <asm/idle.h>
|
||||
#include <asm/uaccess.h>
|
||||
#include <asm/mwait.h>
|
||||
#include <asm/fpu/internal.h>
|
||||
|
|
@ -65,23 +64,6 @@ __visible DEFINE_PER_CPU_SHARED_ALIGNED(struct tss_struct, cpu_tss) = {
|
|||
};
|
||||
EXPORT_PER_CPU_SYMBOL(cpu_tss);
|
||||
|
||||
#ifdef CONFIG_X86_64
|
||||
static DEFINE_PER_CPU(unsigned char, is_idle);
|
||||
static ATOMIC_NOTIFIER_HEAD(idle_notifier);
|
||||
|
||||
void idle_notifier_register(struct notifier_block *n)
|
||||
{
|
||||
atomic_notifier_chain_register(&idle_notifier, n);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(idle_notifier_register);
|
||||
|
||||
void idle_notifier_unregister(struct notifier_block *n)
|
||||
{
|
||||
atomic_notifier_chain_unregister(&idle_notifier, n);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(idle_notifier_unregister);
|
||||
#endif
|
||||
|
||||
/*
|
||||
* this gets called so that we can store lazy state into memory and copy the
|
||||
* current task into the new thread.
|
||||
|
|
@ -251,39 +233,9 @@ static inline void play_dead(void)
|
|||
}
|
||||
#endif
|
||||
|
||||
#ifdef CONFIG_X86_64
|
||||
void enter_idle(void)
|
||||
{
|
||||
this_cpu_write(is_idle, 1);
|
||||
atomic_notifier_call_chain(&idle_notifier, IDLE_START, NULL);
|
||||
}
|
||||
|
||||
static void __exit_idle(void)
|
||||
{
|
||||
if (x86_test_and_clear_bit_percpu(0, is_idle) == 0)
|
||||
return;
|
||||
atomic_notifier_call_chain(&idle_notifier, IDLE_END, NULL);
|
||||
}
|
||||
|
||||
/* Called from interrupts to signify idle end */
|
||||
void exit_idle(void)
|
||||
{
|
||||
/* idle loop has pid 0 */
|
||||
if (current->pid)
|
||||
return;
|
||||
__exit_idle();
|
||||
}
|
||||
#endif
|
||||
|
||||
void arch_cpu_idle_enter(void)
|
||||
{
|
||||
local_touch_nmi();
|
||||
enter_idle();
|
||||
}
|
||||
|
||||
void arch_cpu_idle_exit(void)
|
||||
{
|
||||
__exit_idle();
|
||||
}
|
||||
|
||||
void arch_cpu_idle_dead(void)
|
||||
|
|
@ -336,59 +288,33 @@ void stop_this_cpu(void *dummy)
|
|||
halt();
|
||||
}
|
||||
|
||||
bool amd_e400_c1e_detected;
|
||||
EXPORT_SYMBOL(amd_e400_c1e_detected);
|
||||
|
||||
static cpumask_var_t amd_e400_c1e_mask;
|
||||
|
||||
void amd_e400_remove_cpu(int cpu)
|
||||
{
|
||||
if (amd_e400_c1e_mask != NULL)
|
||||
cpumask_clear_cpu(cpu, amd_e400_c1e_mask);
|
||||
}
|
||||
|
||||
/*
|
||||
* AMD Erratum 400 aware idle routine. We check for C1E active in the interrupt
|
||||
* pending message MSR. If we detect C1E, then we handle it the same
|
||||
* way as C3 power states (local apic timer and TSC stop)
|
||||
* AMD Erratum 400 aware idle routine. We handle it the same way as C3 power
|
||||
* states (local apic timer and TSC stop).
|
||||
*/
|
||||
static void amd_e400_idle(void)
|
||||
{
|
||||
if (!amd_e400_c1e_detected) {
|
||||
u32 lo, hi;
|
||||
|
||||
rdmsr(MSR_K8_INT_PENDING_MSG, lo, hi);
|
||||
|
||||
if (lo & K8_INTP_C1E_ACTIVE_MASK) {
|
||||
amd_e400_c1e_detected = true;
|
||||
if (!boot_cpu_has(X86_FEATURE_NONSTOP_TSC))
|
||||
mark_tsc_unstable("TSC halt in AMD C1E");
|
||||
pr_info("System has AMD C1E enabled\n");
|
||||
}
|
||||
/*
|
||||
* We cannot use static_cpu_has_bug() here because X86_BUG_AMD_APIC_C1E
|
||||
* gets set after static_cpu_has() places have been converted via
|
||||
* alternatives.
|
||||
*/
|
||||
if (!boot_cpu_has_bug(X86_BUG_AMD_APIC_C1E)) {
|
||||
default_idle();
|
||||
return;
|
||||
}
|
||||
|
||||
if (amd_e400_c1e_detected) {
|
||||
int cpu = smp_processor_id();
|
||||
tick_broadcast_enter();
|
||||
|
||||
if (!cpumask_test_cpu(cpu, amd_e400_c1e_mask)) {
|
||||
cpumask_set_cpu(cpu, amd_e400_c1e_mask);
|
||||
/* Force broadcast so ACPI can not interfere. */
|
||||
tick_broadcast_force();
|
||||
pr_info("Switch to broadcast mode on CPU%d\n", cpu);
|
||||
}
|
||||
tick_broadcast_enter();
|
||||
default_idle();
|
||||
|
||||
default_idle();
|
||||
|
||||
/*
|
||||
* The switch back from broadcast mode needs to be
|
||||
* called with interrupts disabled.
|
||||
*/
|
||||
local_irq_disable();
|
||||
tick_broadcast_exit();
|
||||
local_irq_enable();
|
||||
} else
|
||||
default_idle();
|
||||
/*
|
||||
* The switch back from broadcast mode needs to be called with
|
||||
* interrupts disabled.
|
||||
*/
|
||||
local_irq_disable();
|
||||
tick_broadcast_exit();
|
||||
local_irq_enable();
|
||||
}
|
||||
|
||||
/*
|
||||
|
|
@ -448,8 +374,7 @@ void select_idle_routine(const struct cpuinfo_x86 *c)
|
|||
if (x86_idle || boot_option_idle_override == IDLE_POLL)
|
||||
return;
|
||||
|
||||
if (cpu_has_bug(c, X86_BUG_AMD_APIC_C1E)) {
|
||||
/* E400: APIC timer interrupt does not wake up CPU from C1e */
|
||||
if (boot_cpu_has_bug(X86_BUG_AMD_E400)) {
|
||||
pr_info("using AMD E400 aware idle routine\n");
|
||||
x86_idle = amd_e400_idle;
|
||||
} else if (prefer_mwait_c1_over_halt(c)) {
|
||||
|
|
@ -459,11 +384,37 @@ void select_idle_routine(const struct cpuinfo_x86 *c)
|
|||
x86_idle = default_idle;
|
||||
}
|
||||
|
||||
void __init init_amd_e400_c1e_mask(void)
|
||||
void amd_e400_c1e_apic_setup(void)
|
||||
{
|
||||
/* If we're using amd_e400_idle, we need to allocate amd_e400_c1e_mask. */
|
||||
if (x86_idle == amd_e400_idle)
|
||||
zalloc_cpumask_var(&amd_e400_c1e_mask, GFP_KERNEL);
|
||||
if (boot_cpu_has_bug(X86_BUG_AMD_APIC_C1E)) {
|
||||
pr_info("Switch to broadcast mode on CPU%d\n", smp_processor_id());
|
||||
local_irq_disable();
|
||||
tick_broadcast_force();
|
||||
local_irq_enable();
|
||||
}
|
||||
}
|
||||
|
||||
void __init arch_post_acpi_subsys_init(void)
|
||||
{
|
||||
u32 lo, hi;
|
||||
|
||||
if (!boot_cpu_has_bug(X86_BUG_AMD_E400))
|
||||
return;
|
||||
|
||||
/*
|
||||
* AMD E400 detection needs to happen after ACPI has been enabled. If
|
||||
* the machine is affected K8_INTP_C1E_ACTIVE_MASK bits are set in
|
||||
* MSR_K8_INT_PENDING_MSG.
|
||||
*/
|
||||
rdmsr(MSR_K8_INT_PENDING_MSG, lo, hi);
|
||||
if (!(lo & K8_INTP_C1E_ACTIVE_MASK))
|
||||
return;
|
||||
|
||||
boot_cpu_set_bug(X86_BUG_AMD_APIC_C1E);
|
||||
|
||||
if (!boot_cpu_has(X86_FEATURE_NONSTOP_TSC))
|
||||
mark_tsc_unstable("TSC halt in AMD C1E");
|
||||
pr_info("System has AMD C1E enabled\n");
|
||||
}
|
||||
|
||||
static int __init idle_setup(char *str)
|
||||
|
|
|
|||
|
|
@ -49,7 +49,6 @@
|
|||
|
||||
#include <asm/tlbflush.h>
|
||||
#include <asm/cpu.h>
|
||||
#include <asm/idle.h>
|
||||
#include <asm/syscalls.h>
|
||||
#include <asm/debugreg.h>
|
||||
#include <asm/switch_to.h>
|
||||
|
|
|
|||
|
|
@ -44,7 +44,6 @@
|
|||
#include <asm/desc.h>
|
||||
#include <asm/proto.h>
|
||||
#include <asm/ia32.h>
|
||||
#include <asm/idle.h>
|
||||
#include <asm/syscalls.h>
|
||||
#include <asm/debugreg.h>
|
||||
#include <asm/switch_to.h>
|
||||
|
|
|
|||
|
|
@ -58,7 +58,6 @@
|
|||
#include <asm/desc.h>
|
||||
#include <asm/nmi.h>
|
||||
#include <asm/irq.h>
|
||||
#include <asm/idle.h>
|
||||
#include <asm/realmode.h>
|
||||
#include <asm/cpu.h>
|
||||
#include <asm/numa.h>
|
||||
|
|
@ -1596,7 +1595,6 @@ void play_dead_common(void)
|
|||
{
|
||||
idle_task_exit();
|
||||
reset_lazy_tlbstate();
|
||||
amd_e400_remove_cpu(raw_smp_processor_id());
|
||||
|
||||
/* Ack it */
|
||||
(void)cpu_report_death();
|
||||
|
|
|
|||
|
|
@ -19,7 +19,6 @@
|
|||
#include <asm/uv/uv_hub.h>
|
||||
#include <asm/uv/uv_bau.h>
|
||||
#include <asm/apic.h>
|
||||
#include <asm/idle.h>
|
||||
#include <asm/tsc.h>
|
||||
#include <asm/irq_vectors.h>
|
||||
#include <asm/timer.h>
|
||||
|
|
|
|||
|
|
@ -141,7 +141,7 @@ static void lapic_timer_check_state(int state, struct acpi_processor *pr,
|
|||
if (cpu_has(&cpu_data(pr->id), X86_FEATURE_ARAT))
|
||||
return;
|
||||
|
||||
if (amd_e400_c1e_detected)
|
||||
if (boot_cpu_has_bug(X86_BUG_AMD_APIC_C1E))
|
||||
type = ACPI_STATE_C1;
|
||||
|
||||
/*
|
||||
|
|
|
|||
|
|
@ -106,8 +106,6 @@
|
|||
#define IOAT_DMA_COMP_V1 0x0001 /* Compatibility with DMA version 1 */
|
||||
#define IOAT_DMA_COMP_V2 0x0002 /* Compatibility with DMA version 2 */
|
||||
|
||||
/* IOAT1 define left for i7300_idle driver to not fail compiling */
|
||||
#define IOAT1_CHANSTS_OFFSET 0x04
|
||||
#define IOAT_CHANSTS_OFFSET 0x08 /* 64-bit Channel Status Register */
|
||||
#define IOAT_CHANSTS_COMPLETED_DESCRIPTOR_ADDR (~0x3fULL)
|
||||
#define IOAT_CHANSTS_SOFT_ERR 0x10ULL
|
||||
|
|
|
|||
|
|
@ -8,20 +8,3 @@ config INTEL_IDLE
|
|||
native Intel hardware idle features. The acpi_idle driver
|
||||
can be configured at the same time, in order to handle
|
||||
processors intel_idle does not support.
|
||||
|
||||
menu "Memory power savings"
|
||||
depends on X86_64
|
||||
|
||||
config I7300_IDLE_IOAT_CHANNEL
|
||||
bool
|
||||
|
||||
config I7300_IDLE
|
||||
tristate "Intel chipset idle memory power saving driver"
|
||||
select I7300_IDLE_IOAT_CHANNEL
|
||||
help
|
||||
Enable memory power savings when idle with certain Intel server
|
||||
chipsets. The chipset must have I/O AT support, such as the
|
||||
Intel 7300. The power savings depends on the type and quantity of
|
||||
DRAM devices.
|
||||
|
||||
endmenu
|
||||
|
|
|
|||
|
|
@ -1,3 +1,2 @@
|
|||
obj-$(CONFIG_I7300_IDLE) += i7300_idle.o
|
||||
obj-$(CONFIG_INTEL_IDLE) += intel_idle.o
|
||||
|
||||
|
|
|
|||
|
|
@ -1,612 +0,0 @@
|
|||
/*
|
||||
* (C) Copyright 2008 Intel Corporation
|
||||
* Authors:
|
||||
* Andy Henroid <andrew.d.henroid@intel.com>
|
||||
* Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
|
||||
*/
|
||||
|
||||
/*
|
||||
* Save DIMM power on Intel 7300-based platforms when all CPUs/cores
|
||||
* are idle, using the DIMM thermal throttling capability.
|
||||
*
|
||||
* This driver depends on the Intel integrated DMA controller (I/O AT).
|
||||
* If the driver for I/O AT (drivers/dma/ioatdma*) is also enabled,
|
||||
* this driver should work cooperatively.
|
||||
*/
|
||||
|
||||
/* #define DEBUG */
|
||||
|
||||
#include <linux/module.h>
|
||||
#include <linux/pci.h>
|
||||
#include <linux/gfp.h>
|
||||
#include <linux/sched.h>
|
||||
#include <linux/notifier.h>
|
||||
#include <linux/cpumask.h>
|
||||
#include <linux/ktime.h>
|
||||
#include <linux/delay.h>
|
||||
#include <linux/debugfs.h>
|
||||
#include <linux/stop_machine.h>
|
||||
#include <linux/i7300_idle.h>
|
||||
|
||||
#include <asm/idle.h>
|
||||
|
||||
#include "../dma/ioat/hw.h"
|
||||
#include "../dma/ioat/registers.h"
|
||||
|
||||
#define I7300_IDLE_DRIVER_VERSION "1.55"
|
||||
#define I7300_PRINT "i7300_idle:"
|
||||
|
||||
#define MAX_STOP_RETRIES 10
|
||||
|
||||
static int debug;
|
||||
module_param_named(debug, debug, uint, 0644);
|
||||
MODULE_PARM_DESC(debug, "Enable debug printks in this driver");
|
||||
|
||||
static int forceload;
|
||||
module_param_named(forceload, forceload, uint, 0644);
|
||||
MODULE_PARM_DESC(debug, "Enable driver testing on unvalidated i5000");
|
||||
|
||||
#define dprintk(fmt, arg...) \
|
||||
do { if (debug) printk(KERN_INFO I7300_PRINT fmt, ##arg); } while (0)
|
||||
|
||||
/*
|
||||
* Value to set THRTLOW to when initiating throttling
|
||||
* 0 = No throttling
|
||||
* 1 = Throttle when > 4 activations per eval window (Maximum throttling)
|
||||
* 2 = Throttle when > 8 activations
|
||||
* 168 = Throttle when > 672 activations (Minimum throttling)
|
||||
*/
|
||||
#define MAX_THROTTLE_LOW_LIMIT 168
|
||||
static uint throttle_low_limit = 1;
|
||||
module_param_named(throttle_low_limit, throttle_low_limit, uint, 0644);
|
||||
MODULE_PARM_DESC(throttle_low_limit,
|
||||
"Value for THRTLOWLM activation field "
|
||||
"(0 = disable throttle, 1 = Max throttle, 168 = Min throttle)");
|
||||
|
||||
/*
|
||||
* simple invocation and duration statistics
|
||||
*/
|
||||
static unsigned long total_starts;
|
||||
static unsigned long total_us;
|
||||
|
||||
#ifdef DEBUG
|
||||
static unsigned long past_skip;
|
||||
#endif
|
||||
|
||||
static struct pci_dev *fbd_dev;
|
||||
|
||||
static raw_spinlock_t i7300_idle_lock;
|
||||
static int i7300_idle_active;
|
||||
|
||||
static u8 i7300_idle_thrtctl_saved;
|
||||
static u8 i7300_idle_thrtlow_saved;
|
||||
static u32 i7300_idle_mc_saved;
|
||||
|
||||
static cpumask_var_t idle_cpumask;
|
||||
static ktime_t start_ktime;
|
||||
static unsigned long avg_idle_us;
|
||||
|
||||
static struct dentry *debugfs_dir;
|
||||
|
||||
/* Begin: I/O AT Helper routines */
|
||||
|
||||
#define IOAT_CHANBASE(ioat_ctl, chan) (ioat_ctl + 0x80 + 0x80 * chan)
|
||||
/* Snoop control (disable snoops when coherency is not important) */
|
||||
#define IOAT_DESC_SADDR_SNP_CTL (1UL << 1)
|
||||
#define IOAT_DESC_DADDR_SNP_CTL (1UL << 2)
|
||||
|
||||
static struct pci_dev *ioat_dev;
|
||||
static struct ioat_dma_descriptor *ioat_desc; /* I/O AT desc & data (1 page) */
|
||||
static unsigned long ioat_desc_phys;
|
||||
static u8 *ioat_iomap; /* I/O AT memory-mapped control regs (aka CB_BAR) */
|
||||
static u8 *ioat_chanbase;
|
||||
|
||||
/* Start I/O AT memory copy */
|
||||
static int i7300_idle_ioat_start(void)
|
||||
{
|
||||
u32 err;
|
||||
/* Clear error (due to circular descriptor pointer) */
|
||||
err = readl(ioat_chanbase + IOAT_CHANERR_OFFSET);
|
||||
if (err)
|
||||
writel(err, ioat_chanbase + IOAT_CHANERR_OFFSET);
|
||||
|
||||
writeb(IOAT_CHANCMD_START, ioat_chanbase + IOAT1_CHANCMD_OFFSET);
|
||||
return 0;
|
||||
}
|
||||
|
||||
/* Stop I/O AT memory copy */
|
||||
static void i7300_idle_ioat_stop(void)
|
||||
{
|
||||
int i;
|
||||
u64 sts;
|
||||
|
||||
for (i = 0; i < MAX_STOP_RETRIES; i++) {
|
||||
writeb(IOAT_CHANCMD_RESET,
|
||||
ioat_chanbase + IOAT1_CHANCMD_OFFSET);
|
||||
|
||||
udelay(10);
|
||||
|
||||
sts = readq(ioat_chanbase + IOAT1_CHANSTS_OFFSET) &
|
||||
IOAT_CHANSTS_STATUS;
|
||||
|
||||
if (sts != IOAT_CHANSTS_ACTIVE)
|
||||
break;
|
||||
|
||||
}
|
||||
|
||||
if (i == MAX_STOP_RETRIES) {
|
||||
dprintk("failed to stop I/O AT after %d retries\n",
|
||||
MAX_STOP_RETRIES);
|
||||
}
|
||||
}
|
||||
|
||||
/* Test I/O AT by copying 1024 byte from 2k to 1k */
|
||||
static int __init i7300_idle_ioat_selftest(u8 *ctl,
|
||||
struct ioat_dma_descriptor *desc, unsigned long desc_phys)
|
||||
{
|
||||
u64 chan_sts;
|
||||
|
||||
memset(desc, 0, 2048);
|
||||
memset((u8 *) desc + 2048, 0xab, 1024);
|
||||
|
||||
desc[0].size = 1024;
|
||||
desc[0].ctl = 0;
|
||||
desc[0].src_addr = desc_phys + 2048;
|
||||
desc[0].dst_addr = desc_phys + 1024;
|
||||
desc[0].next = 0;
|
||||
|
||||
writeb(IOAT_CHANCMD_RESET, ioat_chanbase + IOAT1_CHANCMD_OFFSET);
|
||||
writeb(IOAT_CHANCMD_START, ioat_chanbase + IOAT1_CHANCMD_OFFSET);
|
||||
|
||||
udelay(1000);
|
||||
|
||||
chan_sts = readq(ioat_chanbase + IOAT1_CHANSTS_OFFSET) &
|
||||
IOAT_CHANSTS_STATUS;
|
||||
|
||||
if (chan_sts != IOAT_CHANSTS_DONE) {
|
||||
/* Not complete, reset the channel */
|
||||
writeb(IOAT_CHANCMD_RESET,
|
||||
ioat_chanbase + IOAT1_CHANCMD_OFFSET);
|
||||
return -1;
|
||||
}
|
||||
|
||||
if (*(u32 *) ((u8 *) desc + 3068) != 0xabababab ||
|
||||
*(u32 *) ((u8 *) desc + 2044) != 0xabababab) {
|
||||
dprintk("Data values src 0x%x, dest 0x%x, memset 0x%x\n",
|
||||
*(u32 *) ((u8 *) desc + 2048),
|
||||
*(u32 *) ((u8 *) desc + 1024),
|
||||
*(u32 *) ((u8 *) desc + 3072));
|
||||
return -1;
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
static struct device dummy_dma_dev = {
|
||||
.init_name = "fallback device",
|
||||
.coherent_dma_mask = DMA_BIT_MASK(64),
|
||||
.dma_mask = &dummy_dma_dev.coherent_dma_mask,
|
||||
};
|
||||
|
||||
/* Setup and initialize I/O AT */
|
||||
/* This driver needs I/O AT as the throttling takes effect only when there is
|
||||
* some memory activity. We use I/O AT to set up a dummy copy, while all CPUs
|
||||
* go idle and memory is throttled.
|
||||
*/
|
||||
static int __init i7300_idle_ioat_init(void)
|
||||
{
|
||||
u8 ver, chan_count, ioat_chan;
|
||||
u16 chan_ctl;
|
||||
|
||||
ioat_iomap = (u8 *) ioremap_nocache(pci_resource_start(ioat_dev, 0),
|
||||
pci_resource_len(ioat_dev, 0));
|
||||
|
||||
if (!ioat_iomap) {
|
||||
printk(KERN_ERR I7300_PRINT "failed to map I/O AT registers\n");
|
||||
goto err_ret;
|
||||
}
|
||||
|
||||
ver = readb(ioat_iomap + IOAT_VER_OFFSET);
|
||||
if (ver != IOAT_VER_1_2) {
|
||||
printk(KERN_ERR I7300_PRINT "unknown I/O AT version (%u.%u)\n",
|
||||
ver >> 4, ver & 0xf);
|
||||
goto err_unmap;
|
||||
}
|
||||
|
||||
chan_count = readb(ioat_iomap + IOAT_CHANCNT_OFFSET);
|
||||
if (!chan_count) {
|
||||
printk(KERN_ERR I7300_PRINT "unexpected # of I/O AT channels "
|
||||
"(%u)\n",
|
||||
chan_count);
|
||||
goto err_unmap;
|
||||
}
|
||||
|
||||
ioat_chan = chan_count - 1;
|
||||
ioat_chanbase = IOAT_CHANBASE(ioat_iomap, ioat_chan);
|
||||
|
||||
chan_ctl = readw(ioat_chanbase + IOAT_CHANCTRL_OFFSET);
|
||||
if (chan_ctl & IOAT_CHANCTRL_CHANNEL_IN_USE) {
|
||||
printk(KERN_ERR I7300_PRINT "channel %d in use\n", ioat_chan);
|
||||
goto err_unmap;
|
||||
}
|
||||
|
||||
writew(IOAT_CHANCTRL_CHANNEL_IN_USE,
|
||||
ioat_chanbase + IOAT_CHANCTRL_OFFSET);
|
||||
|
||||
ioat_desc = (struct ioat_dma_descriptor *)dma_alloc_coherent(
|
||||
&dummy_dma_dev, 4096,
|
||||
(dma_addr_t *)&ioat_desc_phys, GFP_KERNEL);
|
||||
if (!ioat_desc) {
|
||||
printk(KERN_ERR I7300_PRINT "failed to allocate I/O AT desc\n");
|
||||
goto err_mark_unused;
|
||||
}
|
||||
|
||||
writel(ioat_desc_phys & 0xffffffffUL,
|
||||
ioat_chanbase + IOAT1_CHAINADDR_OFFSET_LOW);
|
||||
writel(ioat_desc_phys >> 32,
|
||||
ioat_chanbase + IOAT1_CHAINADDR_OFFSET_HIGH);
|
||||
|
||||
if (i7300_idle_ioat_selftest(ioat_iomap, ioat_desc, ioat_desc_phys)) {
|
||||
printk(KERN_ERR I7300_PRINT "I/O AT self-test failed\n");
|
||||
goto err_free;
|
||||
}
|
||||
|
||||
/* Setup circular I/O AT descriptor chain */
|
||||
ioat_desc[0].ctl = IOAT_DESC_SADDR_SNP_CTL | IOAT_DESC_DADDR_SNP_CTL;
|
||||
ioat_desc[0].src_addr = ioat_desc_phys + 2048;
|
||||
ioat_desc[0].dst_addr = ioat_desc_phys + 3072;
|
||||
ioat_desc[0].size = 128;
|
||||
ioat_desc[0].next = ioat_desc_phys + sizeof(struct ioat_dma_descriptor);
|
||||
|
||||
ioat_desc[1].ctl = ioat_desc[0].ctl;
|
||||
ioat_desc[1].src_addr = ioat_desc[0].src_addr;
|
||||
ioat_desc[1].dst_addr = ioat_desc[0].dst_addr;
|
||||
ioat_desc[1].size = ioat_desc[0].size;
|
||||
ioat_desc[1].next = ioat_desc_phys;
|
||||
|
||||
return 0;
|
||||
|
||||
err_free:
|
||||
dma_free_coherent(&dummy_dma_dev, 4096, (void *)ioat_desc, 0);
|
||||
err_mark_unused:
|
||||
writew(0, ioat_chanbase + IOAT_CHANCTRL_OFFSET);
|
||||
err_unmap:
|
||||
iounmap(ioat_iomap);
|
||||
err_ret:
|
||||
return -ENODEV;
|
||||
}
|
||||
|
||||
/* Cleanup I/O AT */
|
||||
static void __exit i7300_idle_ioat_exit(void)
|
||||
{
|
||||
int i;
|
||||
u64 chan_sts;
|
||||
|
||||
i7300_idle_ioat_stop();
|
||||
|
||||
/* Wait for a while for the channel to halt before releasing */
|
||||
for (i = 0; i < MAX_STOP_RETRIES; i++) {
|
||||
writeb(IOAT_CHANCMD_RESET,
|
||||
ioat_chanbase + IOAT1_CHANCMD_OFFSET);
|
||||
|
||||
chan_sts = readq(ioat_chanbase + IOAT1_CHANSTS_OFFSET) &
|
||||
IOAT_CHANSTS_STATUS;
|
||||
|
||||
if (chan_sts != IOAT_CHANSTS_ACTIVE) {
|
||||
writew(0, ioat_chanbase + IOAT_CHANCTRL_OFFSET);
|
||||
break;
|
||||
}
|
||||
udelay(1000);
|
||||
}
|
||||
|
||||
chan_sts = readq(ioat_chanbase + IOAT1_CHANSTS_OFFSET) &
|
||||
IOAT_CHANSTS_STATUS;
|
||||
|
||||
/*
|
||||
* We tried to reset multiple times. If IO A/T channel is still active
|
||||
* flag an error and return without cleanup. Memory leak is better
|
||||
* than random corruption in that extreme error situation.
|
||||
*/
|
||||
if (chan_sts == IOAT_CHANSTS_ACTIVE) {
|
||||
printk(KERN_ERR I7300_PRINT "Unable to stop IO A/T channels."
|
||||
" Not freeing resources\n");
|
||||
return;
|
||||
}
|
||||
|
||||
dma_free_coherent(&dummy_dma_dev, 4096, (void *)ioat_desc, 0);
|
||||
iounmap(ioat_iomap);
|
||||
}
|
||||
|
||||
/* End: I/O AT Helper routines */
|
||||
|
||||
#define DIMM_THRTLOW 0x64
|
||||
#define DIMM_THRTCTL 0x67
|
||||
#define DIMM_THRTCTL_THRMHUNT (1UL << 0)
|
||||
#define DIMM_MC 0x40
|
||||
#define DIMM_GTW_MODE (1UL << 17)
|
||||
#define DIMM_GBLACT 0x60
|
||||
|
||||
/*
|
||||
* Keep track of an exponential-decaying average of recent idle durations.
|
||||
* The latest duration gets DURATION_WEIGHT_PCT percentage weight
|
||||
* in this average, with the old average getting the remaining weight.
|
||||
*
|
||||
* High weights emphasize recent history, low weights include long history.
|
||||
*/
|
||||
#define DURATION_WEIGHT_PCT 55
|
||||
|
||||
/*
|
||||
* When the decaying average of recent durations or the predicted duration
|
||||
* of the next timer interrupt is shorter than duration_threshold, the
|
||||
* driver will decline to throttle.
|
||||
*/
|
||||
#define DURATION_THRESHOLD_US 100
|
||||
|
||||
|
||||
/* Store DIMM thermal throttle configuration */
|
||||
static int i7300_idle_thrt_save(void)
|
||||
{
|
||||
u32 new_mc_val;
|
||||
u8 gblactlm;
|
||||
|
||||
pci_read_config_byte(fbd_dev, DIMM_THRTCTL, &i7300_idle_thrtctl_saved);
|
||||
pci_read_config_byte(fbd_dev, DIMM_THRTLOW, &i7300_idle_thrtlow_saved);
|
||||
pci_read_config_dword(fbd_dev, DIMM_MC, &i7300_idle_mc_saved);
|
||||
/*
|
||||
* Make sure we have Global Throttling Window Mode set to have a
|
||||
* "short" window. This (mostly) works around an issue where
|
||||
* throttling persists until the end of the global throttling window
|
||||
* size. On the tested system, this was resulting in a maximum of
|
||||
* 64 ms to exit throttling (average 32 ms). The actual numbers
|
||||
* depends on system frequencies. Setting the short window reduces
|
||||
* this by a factor of 4096.
|
||||
*
|
||||
* We will only do this only if the system is set for
|
||||
* unlimited-activations while in open-loop throttling (i.e., when
|
||||
* Global Activation Throttle Limit is zero).
|
||||
*/
|
||||
pci_read_config_byte(fbd_dev, DIMM_GBLACT, &gblactlm);
|
||||
dprintk("thrtctl_saved = 0x%02x, thrtlow_saved = 0x%02x\n",
|
||||
i7300_idle_thrtctl_saved,
|
||||
i7300_idle_thrtlow_saved);
|
||||
dprintk("mc_saved = 0x%08x, gblactlm = 0x%02x\n",
|
||||
i7300_idle_mc_saved,
|
||||
gblactlm);
|
||||
if (gblactlm == 0) {
|
||||
new_mc_val = i7300_idle_mc_saved | DIMM_GTW_MODE;
|
||||
pci_write_config_dword(fbd_dev, DIMM_MC, new_mc_val);
|
||||
return 0;
|
||||
} else {
|
||||
dprintk("could not set GTW_MODE = 1 (OLTT enabled)\n");
|
||||
return -ENODEV;
|
||||
}
|
||||
}
|
||||
|
||||
/* Restore DIMM thermal throttle configuration */
|
||||
static void i7300_idle_thrt_restore(void)
|
||||
{
|
||||
pci_write_config_dword(fbd_dev, DIMM_MC, i7300_idle_mc_saved);
|
||||
pci_write_config_byte(fbd_dev, DIMM_THRTLOW, i7300_idle_thrtlow_saved);
|
||||
pci_write_config_byte(fbd_dev, DIMM_THRTCTL, i7300_idle_thrtctl_saved);
|
||||
}
|
||||
|
||||
/* Enable DIMM thermal throttling */
|
||||
static void i7300_idle_start(void)
|
||||
{
|
||||
u8 new_ctl;
|
||||
u8 limit;
|
||||
|
||||
new_ctl = i7300_idle_thrtctl_saved & ~DIMM_THRTCTL_THRMHUNT;
|
||||
pci_write_config_byte(fbd_dev, DIMM_THRTCTL, new_ctl);
|
||||
|
||||
limit = throttle_low_limit;
|
||||
if (unlikely(limit > MAX_THROTTLE_LOW_LIMIT))
|
||||
limit = MAX_THROTTLE_LOW_LIMIT;
|
||||
|
||||
pci_write_config_byte(fbd_dev, DIMM_THRTLOW, limit);
|
||||
|
||||
new_ctl = i7300_idle_thrtctl_saved | DIMM_THRTCTL_THRMHUNT;
|
||||
pci_write_config_byte(fbd_dev, DIMM_THRTCTL, new_ctl);
|
||||
}
|
||||
|
||||
/* Disable DIMM thermal throttling */
|
||||
static void i7300_idle_stop(void)
|
||||
{
|
||||
u8 new_ctl;
|
||||
u8 got_ctl;
|
||||
|
||||
new_ctl = i7300_idle_thrtctl_saved & ~DIMM_THRTCTL_THRMHUNT;
|
||||
pci_write_config_byte(fbd_dev, DIMM_THRTCTL, new_ctl);
|
||||
|
||||
pci_write_config_byte(fbd_dev, DIMM_THRTLOW, i7300_idle_thrtlow_saved);
|
||||
pci_write_config_byte(fbd_dev, DIMM_THRTCTL, i7300_idle_thrtctl_saved);
|
||||
pci_read_config_byte(fbd_dev, DIMM_THRTCTL, &got_ctl);
|
||||
WARN_ON_ONCE(got_ctl != i7300_idle_thrtctl_saved);
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* i7300_avg_duration_check()
|
||||
* return 0 if the decaying average of recent idle durations is
|
||||
* more than DURATION_THRESHOLD_US
|
||||
*/
|
||||
static int i7300_avg_duration_check(void)
|
||||
{
|
||||
if (avg_idle_us >= DURATION_THRESHOLD_US)
|
||||
return 0;
|
||||
|
||||
#ifdef DEBUG
|
||||
past_skip++;
|
||||
#endif
|
||||
return 1;
|
||||
}
|
||||
|
||||
/* Idle notifier to look at idle CPUs */
|
||||
static int i7300_idle_notifier(struct notifier_block *nb, unsigned long val,
|
||||
void *data)
|
||||
{
|
||||
unsigned long flags;
|
||||
ktime_t now_ktime;
|
||||
static ktime_t idle_begin_time;
|
||||
static int time_init = 1;
|
||||
|
||||
if (!throttle_low_limit)
|
||||
return 0;
|
||||
|
||||
if (unlikely(time_init)) {
|
||||
time_init = 0;
|
||||
idle_begin_time = ktime_get();
|
||||
}
|
||||
|
||||
raw_spin_lock_irqsave(&i7300_idle_lock, flags);
|
||||
if (val == IDLE_START) {
|
||||
|
||||
cpumask_set_cpu(smp_processor_id(), idle_cpumask);
|
||||
|
||||
if (cpumask_weight(idle_cpumask) != num_online_cpus())
|
||||
goto end;
|
||||
|
||||
now_ktime = ktime_get();
|
||||
idle_begin_time = now_ktime;
|
||||
|
||||
if (i7300_avg_duration_check())
|
||||
goto end;
|
||||
|
||||
i7300_idle_active = 1;
|
||||
total_starts++;
|
||||
start_ktime = now_ktime;
|
||||
|
||||
i7300_idle_start();
|
||||
i7300_idle_ioat_start();
|
||||
|
||||
} else if (val == IDLE_END) {
|
||||
cpumask_clear_cpu(smp_processor_id(), idle_cpumask);
|
||||
if (cpumask_weight(idle_cpumask) == (num_online_cpus() - 1)) {
|
||||
/* First CPU coming out of idle */
|
||||
u64 idle_duration_us;
|
||||
|
||||
now_ktime = ktime_get();
|
||||
|
||||
idle_duration_us = ktime_to_us(ktime_sub
|
||||
(now_ktime, idle_begin_time));
|
||||
|
||||
avg_idle_us =
|
||||
((100 - DURATION_WEIGHT_PCT) * avg_idle_us +
|
||||
DURATION_WEIGHT_PCT * idle_duration_us) / 100;
|
||||
|
||||
if (i7300_idle_active) {
|
||||
ktime_t idle_ktime;
|
||||
|
||||
idle_ktime = ktime_sub(now_ktime, start_ktime);
|
||||
total_us += ktime_to_us(idle_ktime);
|
||||
|
||||
i7300_idle_ioat_stop();
|
||||
i7300_idle_stop();
|
||||
i7300_idle_active = 0;
|
||||
}
|
||||
}
|
||||
}
|
||||
end:
|
||||
raw_spin_unlock_irqrestore(&i7300_idle_lock, flags);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static struct notifier_block i7300_idle_nb = {
|
||||
.notifier_call = i7300_idle_notifier,
|
||||
};
|
||||
|
||||
MODULE_DEVICE_TABLE(pci, pci_tbl);
|
||||
|
||||
static ssize_t stats_read_ul(struct file *fp, char __user *ubuf, size_t count,
|
||||
loff_t *off)
|
||||
{
|
||||
unsigned long *p = fp->private_data;
|
||||
char buf[32];
|
||||
int len;
|
||||
|
||||
len = snprintf(buf, 32, "%lu\n", *p);
|
||||
return simple_read_from_buffer(ubuf, count, off, buf, len);
|
||||
}
|
||||
|
||||
static const struct file_operations idle_fops = {
|
||||
.open = simple_open,
|
||||
.read = stats_read_ul,
|
||||
.llseek = default_llseek,
|
||||
};
|
||||
|
||||
struct debugfs_file_info {
|
||||
void *ptr;
|
||||
char name[32];
|
||||
struct dentry *file;
|
||||
} debugfs_file_list[] = {
|
||||
{&total_starts, "total_starts", NULL},
|
||||
{&total_us, "total_us", NULL},
|
||||
#ifdef DEBUG
|
||||
{&past_skip, "past_skip", NULL},
|
||||
#endif
|
||||
{NULL, "", NULL}
|
||||
};
|
||||
|
||||
static int __init i7300_idle_init(void)
|
||||
{
|
||||
raw_spin_lock_init(&i7300_idle_lock);
|
||||
total_us = 0;
|
||||
|
||||
if (i7300_idle_platform_probe(&fbd_dev, &ioat_dev, forceload))
|
||||
return -ENODEV;
|
||||
|
||||
if (i7300_idle_thrt_save())
|
||||
return -ENODEV;
|
||||
|
||||
if (i7300_idle_ioat_init())
|
||||
return -ENODEV;
|
||||
|
||||
if (!zalloc_cpumask_var(&idle_cpumask, GFP_KERNEL))
|
||||
return -ENOMEM;
|
||||
|
||||
debugfs_dir = debugfs_create_dir("i7300_idle", NULL);
|
||||
if (debugfs_dir) {
|
||||
int i = 0;
|
||||
|
||||
while (debugfs_file_list[i].ptr != NULL) {
|
||||
debugfs_file_list[i].file = debugfs_create_file(
|
||||
debugfs_file_list[i].name,
|
||||
S_IRUSR,
|
||||
debugfs_dir,
|
||||
debugfs_file_list[i].ptr,
|
||||
&idle_fops);
|
||||
i++;
|
||||
}
|
||||
}
|
||||
|
||||
idle_notifier_register(&i7300_idle_nb);
|
||||
|
||||
printk(KERN_INFO "i7300_idle: loaded v%s\n", I7300_IDLE_DRIVER_VERSION);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void __exit i7300_idle_exit(void)
|
||||
{
|
||||
idle_notifier_unregister(&i7300_idle_nb);
|
||||
free_cpumask_var(idle_cpumask);
|
||||
|
||||
if (debugfs_dir) {
|
||||
int i = 0;
|
||||
|
||||
while (debugfs_file_list[i].file != NULL) {
|
||||
debugfs_remove(debugfs_file_list[i].file);
|
||||
i++;
|
||||
}
|
||||
|
||||
debugfs_remove(debugfs_dir);
|
||||
}
|
||||
i7300_idle_thrt_restore();
|
||||
i7300_idle_ioat_exit();
|
||||
}
|
||||
|
||||
module_init(i7300_idle_init);
|
||||
module_exit(i7300_idle_exit);
|
||||
|
||||
MODULE_AUTHOR("Andy Henroid <andrew.d.henroid@intel.com>");
|
||||
MODULE_DESCRIPTION("Intel Chipset DIMM Idle Power Saving Driver v"
|
||||
I7300_IDLE_DRIVER_VERSION);
|
||||
MODULE_LICENSE("GPL");
|
||||
|
|
@ -56,7 +56,6 @@
|
|||
#include <asm/msr.h>
|
||||
#include <asm/mwait.h>
|
||||
#include <asm/cpu_device_id.h>
|
||||
#include <asm/idle.h>
|
||||
#include <asm/hardirq.h>
|
||||
|
||||
#define MAX_TARGET_RATIO (50U)
|
||||
|
|
|
|||
|
|
@ -37,7 +37,6 @@
|
|||
#include <asm/desc.h>
|
||||
#include <asm/ptrace.h>
|
||||
#include <asm/irq.h>
|
||||
#include <asm/idle.h>
|
||||
#include <asm/io_apic.h>
|
||||
#include <asm/i8259.h>
|
||||
#include <asm/xen/pci.h>
|
||||
|
|
@ -1256,7 +1255,6 @@ void xen_evtchn_do_upcall(struct pt_regs *regs)
|
|||
|
||||
irq_enter();
|
||||
#ifdef CONFIG_X86
|
||||
exit_idle();
|
||||
inc_irq_stat(irq_hv_callback_count);
|
||||
#endif
|
||||
|
||||
|
|
|
|||
|
|
@ -448,6 +448,8 @@ void __init parse_early_param(void)
|
|||
done = 1;
|
||||
}
|
||||
|
||||
void __init __weak arch_post_acpi_subsys_init(void) { }
|
||||
|
||||
void __init __weak smp_setup_processor_id(void)
|
||||
{
|
||||
}
|
||||
|
|
@ -649,6 +651,7 @@ asmlinkage __visible void __init start_kernel(void)
|
|||
check_bugs();
|
||||
|
||||
acpi_subsystem_init();
|
||||
arch_post_acpi_subsys_init();
|
||||
sfi_init_late();
|
||||
|
||||
if (efi_enabled(EFI_RUNTIME_SERVICES)) {
|
||||
|
|
|
|||
Loading…
Reference in New Issue