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Merge branch 'x86-apic-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Browse Source 
Pull x86 apic changes from Ingo Molnar:
 "An xAPIC CPU hotplug race fix, plus cleanups and minor fixes"

* 'x86-apic-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/apic: Plug racy xAPIC access of CPU hotplug code
  x86/apic: Always define nox2apic and define it as initdata
  x86/apic: Remove unused function prototypes
  x86/apic: Switch wait_for_init_deassert() to a bool flag
  x86/apic: Only use default_wait_for_init_deassert()
This commit is contained in:
Linus Torvalds 2014-03-31 11:58:45 -07:00
commit 6ed7705167
14 changed files with 36 additions and 46 deletions
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14
arch/x86/include/asm/apic.h
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@ -93,9 +93,6 @@ static inline int is_vsmp_box(void)
return 0;
}
#endif
extern void xapic_wait_icr_idle(void);
extern u32 safe_xapic_wait_icr_idle(void);
extern void xapic_icr_write(u32, u32);
extern int setup_profiling_timer(unsigned int);
static inline void native_apic_mem_write(u32 reg, u32 v)
@ -184,7 +181,6 @@ extern int x2apic_phys;
extern int x2apic_preenabled;
extern void check_x2apic(void);
extern void enable_x2apic(void);
extern void x2apic_icr_write(u32 low, u32 id);
static inline int x2apic_enabled(void)
{
u64 msr;
@ -221,7 +217,6 @@ static inline void x2apic_force_phys(void)
{
}
#define nox2apic 0
#define x2apic_preenabled 0
#define x2apic_supported() 0
#endif
@ -351,7 +346,7 @@ struct apic {
int trampoline_phys_low;
int trampoline_phys_high;
void (*wait_for_init_deassert)(atomic_t *deassert);
bool wait_for_init_deassert;
void (*smp_callin_clear_local_apic)(void);
void (*inquire_remote_apic)(int apicid);
@ -517,13 +512,6 @@ extern int default_cpu_present_to_apicid(int mps_cpu);
extern int default_check_phys_apicid_present(int phys_apicid);
#endif
static inline void default_wait_for_init_deassert(atomic_t *deassert)
{
while (!atomic_read(deassert))
cpu_relax();
return;
}
extern void generic_bigsmp_probe(void);

13
arch/x86/kernel/apic/apic.c
View File

@ -133,6 +133,10 @@ static inline void imcr_apic_to_pic(void)
* +1=force-enable
*/
static int force_enable_local_apic __initdata;
/* Control whether x2APIC mode is enabled or not */
static bool nox2apic __initdata;
/*
* APIC command line parameters
*/
@ -162,8 +166,7 @@ int x2apic_mode;
/* x2apic enabled before OS handover */
int x2apic_preenabled;
static int x2apic_disabled;
static int nox2apic;
static __init int setup_nox2apic(char *str)
static int __init setup_nox2apic(char *str)
{
if (x2apic_enabled()) {
int apicid = native_apic_msr_read(APIC_ID);
@ -178,7 +181,7 @@ static __init int setup_nox2apic(char *str)
} else
setup_clear_cpu_cap(X86_FEATURE_X2APIC);
nox2apic = 1;
nox2apic = true;
return 0;
}
@ -283,8 +286,12 @@ u32 native_safe_apic_wait_icr_idle(void)
void native_apic_icr_write(u32 low, u32 id)
{
unsigned long flags;
local_irq_save(flags);
apic_write(APIC_ICR2, SET_APIC_DEST_FIELD(id));
apic_write(APIC_ICR, low);
local_irq_restore(flags);
}
u64 native_apic_icr_read(void)

4
arch/x86/kernel/apic/apic_flat_64.c
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@ -198,7 +198,7 @@ static struct apic apic_flat = {
.trampoline_phys_low = DEFAULT_TRAMPOLINE_PHYS_LOW,
.trampoline_phys_high = DEFAULT_TRAMPOLINE_PHYS_HIGH,
.wait_for_init_deassert = NULL,
.wait_for_init_deassert = false,
.smp_callin_clear_local_apic = NULL,
.inquire_remote_apic = default_inquire_remote_apic,
@ -314,7 +314,7 @@ static struct apic apic_physflat = {
.trampoline_phys_low = DEFAULT_TRAMPOLINE_PHYS_LOW,
.trampoline_phys_high = DEFAULT_TRAMPOLINE_PHYS_HIGH,
.wait_for_init_deassert = NULL,
.wait_for_init_deassert = false,
.smp_callin_clear_local_apic = NULL,
.inquire_remote_apic = default_inquire_remote_apic,

3
arch/x86/kernel/apic/apic_noop.c
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@ -172,8 +172,7 @@ struct apic apic_noop = {
.trampoline_phys_low = DEFAULT_TRAMPOLINE_PHYS_LOW,
.trampoline_phys_high = DEFAULT_TRAMPOLINE_PHYS_HIGH,
.wait_for_init_deassert = NULL,
.wait_for_init_deassert = false,
.smp_callin_clear_local_apic = NULL,
.inquire_remote_apic = NULL,

2
arch/x86/kernel/apic/apic_numachip.c
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@ -248,7 +248,7 @@ static const struct apic apic_numachip __refconst = {
.wakeup_secondary_cpu = numachip_wakeup_secondary,
.trampoline_phys_low = DEFAULT_TRAMPOLINE_PHYS_LOW,
.trampoline_phys_high = DEFAULT_TRAMPOLINE_PHYS_HIGH,
.wait_for_init_deassert = NULL,
.wait_for_init_deassert = false,
.smp_callin_clear_local_apic = NULL,
.inquire_remote_apic = NULL, /* REMRD not supported */

3
arch/x86/kernel/apic/bigsmp_32.c
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@ -199,8 +199,7 @@ static struct apic apic_bigsmp = {
.trampoline_phys_low = DEFAULT_TRAMPOLINE_PHYS_LOW,
.trampoline_phys_high = DEFAULT_TRAMPOLINE_PHYS_HIGH,
.wait_for_init_deassert = default_wait_for_init_deassert,
.wait_for_init_deassert = true,
.smp_callin_clear_local_apic = NULL,
.inquire_remote_apic = default_inquire_remote_apic,

12
arch/x86/kernel/apic/es7000_32.c
View File

@ -394,12 +394,6 @@ static void es7000_enable_apic_mode(void)
WARN(1, "Command failed, status = %x\n", mip_status);
}
static void es7000_wait_for_init_deassert(atomic_t *deassert)
{
while (!atomic_read(deassert))
cpu_relax();
}
static unsigned int es7000_get_apic_id(unsigned long x)
{
return (x >> 24) & 0xFF;
@ -658,8 +652,7 @@ static struct apic __refdata apic_es7000_cluster = {
.trampoline_phys_low = 0x467,
.trampoline_phys_high = 0x469,
.wait_for_init_deassert = NULL,
.wait_for_init_deassert = false,
/* Nothing to do for most platforms, since cleared by the INIT cycle: */
.smp_callin_clear_local_apic = NULL,
.inquire_remote_apic = default_inquire_remote_apic,
@ -722,8 +715,7 @@ static struct apic __refdata apic_es7000 = {
.trampoline_phys_low = 0x467,
.trampoline_phys_high = 0x469,
.wait_for_init_deassert = es7000_wait_for_init_deassert,
.wait_for_init_deassert = true,
/* Nothing to do for most platforms, since cleared by the INIT cycle: */
.smp_callin_clear_local_apic = NULL,
.inquire_remote_apic = default_inquire_remote_apic,

3
arch/x86/kernel/apic/numaq_32.c
View File

@ -505,8 +505,7 @@ static struct apic __refdata apic_numaq = {
.trampoline_phys_high = NUMAQ_TRAMPOLINE_PHYS_HIGH,
/* We don't do anything here because we use NMI's to boot instead */
.wait_for_init_deassert = NULL,
.wait_for_init_deassert = false,
.smp_callin_clear_local_apic = numaq_smp_callin_clear_local_apic,
.inquire_remote_apic = NULL,

3
arch/x86/kernel/apic/probe_32.c
View File

@ -119,8 +119,7 @@ static struct apic apic_default = {
.trampoline_phys_low = DEFAULT_TRAMPOLINE_PHYS_LOW,
.trampoline_phys_high = DEFAULT_TRAMPOLINE_PHYS_HIGH,
.wait_for_init_deassert = default_wait_for_init_deassert,
.wait_for_init_deassert = true,
.smp_callin_clear_local_apic = NULL,
.inquire_remote_apic = default_inquire_remote_apic,

3
arch/x86/kernel/apic/summit_32.c
View File

@ -532,8 +532,7 @@ static struct apic apic_summit = {
.trampoline_phys_low = DEFAULT_TRAMPOLINE_PHYS_LOW,
.trampoline_phys_high = DEFAULT_TRAMPOLINE_PHYS_HIGH,
.wait_for_init_deassert = default_wait_for_init_deassert,
.wait_for_init_deassert = true,
.smp_callin_clear_local_apic = NULL,
.inquire_remote_apic = default_inquire_remote_apic,

2
arch/x86/kernel/apic/x2apic_cluster.c
View File

@ -279,7 +279,7 @@ static struct apic apic_x2apic_cluster = {
.trampoline_phys_low = DEFAULT_TRAMPOLINE_PHYS_LOW,
.trampoline_phys_high = DEFAULT_TRAMPOLINE_PHYS_HIGH,
.wait_for_init_deassert = NULL,
.wait_for_init_deassert = false,
.smp_callin_clear_local_apic = NULL,
.inquire_remote_apic = NULL,

2
arch/x86/kernel/apic/x2apic_phys.c
View File

@ -133,7 +133,7 @@ static struct apic apic_x2apic_phys = {
.trampoline_phys_low = DEFAULT_TRAMPOLINE_PHYS_LOW,
.trampoline_phys_high = DEFAULT_TRAMPOLINE_PHYS_HIGH,
.wait_for_init_deassert = NULL,
.wait_for_init_deassert = false,
.smp_callin_clear_local_apic = NULL,
.inquire_remote_apic = NULL,

2
arch/x86/kernel/apic/x2apic_uv_x.c
View File

@ -396,7 +396,7 @@ static struct apic __refdata apic_x2apic_uv_x = {
.wakeup_secondary_cpu = uv_wakeup_secondary,
.trampoline_phys_low = DEFAULT_TRAMPOLINE_PHYS_LOW,
.trampoline_phys_high = DEFAULT_TRAMPOLINE_PHYS_HIGH,
.wait_for_init_deassert = NULL,
.wait_for_init_deassert = false,
.smp_callin_clear_local_apic = NULL,
.inquire_remote_apic = NULL,

16
arch/x86/kernel/smpboot.c
View File

@ -122,8 +122,9 @@ static void smp_callin(void)
* Since CPU0 is not wakened up by INIT, it doesn't wait for the IPI.
*/
cpuid = smp_processor_id();
if (apic->wait_for_init_deassert && cpuid != 0)
apic->wait_for_init_deassert(&init_deasserted);
if (apic->wait_for_init_deassert && cpuid)
while (!atomic_read(&init_deasserted))
cpu_relax();
/*
* (This works even if the APIC is not enabled.)
@ -701,11 +702,15 @@ wakeup_cpu_via_init_nmi(int cpu, unsigned long start_ip, int apicid,
int id;
int boot_error;
preempt_disable();
/*
* Wake up AP by INIT, INIT, STARTUP sequence.
*/
if (cpu)
return wakeup_secondary_cpu_via_init(apicid, start_ip);
if (cpu) {
boot_error = wakeup_secondary_cpu_via_init(apicid, start_ip);
goto out;
}
/*
* Wake up BSP by nmi.
@ -725,6 +730,9 @@ wakeup_cpu_via_init_nmi(int cpu, unsigned long start_ip, int apicid,
boot_error = wakeup_secondary_cpu_via_nmi(id, start_ip);
}
out:
preempt_enable();
return boot_error;
}