diff options
| -rw-r--r-- | arch/i386/kernel/cpu/mtrr/main.c | 11 | ||||
| -rw-r--r-- | arch/i386/kernel/smpboot.c | 7 | ||||
| -rw-r--r-- | arch/x86_64/kernel/smpboot.c | 6 | ||||
| -rw-r--r-- | include/asm-i386/mtrr.h | 2 | ||||
| -rw-r--r-- | include/asm-x86_64/mtrr.h | 2 |
5 files changed, 28 insertions, 0 deletions
diff --git a/arch/i386/kernel/cpu/mtrr/main.c b/arch/i386/kernel/cpu/mtrr/main.c index 0acfb6a5a22..02a2f39e5e0 100644 --- a/arch/i386/kernel/cpu/mtrr/main.c +++ b/arch/i386/kernel/cpu/mtrr/main.c @@ -729,6 +729,17 @@ void mtrr_ap_init(void) local_irq_restore(flags); } +/** + * Save current fixed-range MTRR state of the BSP + */ +void mtrr_save_state(void) +{ + if (smp_processor_id() == 0) + mtrr_save_fixed_ranges(NULL); + else + smp_call_function_single(0, mtrr_save_fixed_ranges, NULL, 1, 1); +} + static int __init mtrr_init_finialize(void) { if (!mtrr_if) diff --git a/arch/i386/kernel/smpboot.c b/arch/i386/kernel/smpboot.c index 7c1dbef399c..f14d93351a8 100644 --- a/arch/i386/kernel/smpboot.c +++ b/arch/i386/kernel/smpboot.c @@ -58,6 +58,7 @@ #include <mach_wakecpu.h> #include <smpboot_hooks.h> #include <asm/vmi.h> +#include <asm/mtrr.h> /* Set if we find a B stepping CPU */ static int __devinitdata smp_b_stepping; @@ -815,6 +816,12 @@ static int __cpuinit do_boot_cpu(int apicid, int cpu) unsigned short nmi_high = 0, nmi_low = 0; /* + * Save current MTRR state in case it was changed since early boot + * (e.g. by the ACPI SMI) to initialize new CPUs with MTRRs in sync: + */ + mtrr_save_state(); + + /* * We can't use kernel_thread since we must avoid to * reschedule the child. */ diff --git a/arch/x86_64/kernel/smpboot.c b/arch/x86_64/kernel/smpboot.c index 14724be48be..ddc392bee24 100644 --- a/arch/x86_64/kernel/smpboot.c +++ b/arch/x86_64/kernel/smpboot.c @@ -944,6 +944,12 @@ int __cpuinit __cpu_up(unsigned int cpu) return -ENOSYS; } + /* + * Save current MTRR state in case it was changed since early boot + * (e.g. by the ACPI SMI) to initialize new CPUs with MTRRs in sync: + */ + mtrr_save_state(); + per_cpu(cpu_state, cpu) = CPU_UP_PREPARE; /* Boot it! */ err = do_boot_cpu(cpu, apicid); diff --git a/include/asm-i386/mtrr.h b/include/asm-i386/mtrr.h index 02a41b99bd7..7e9c7ccbdcf 100644 --- a/include/asm-i386/mtrr.h +++ b/include/asm-i386/mtrr.h @@ -70,6 +70,7 @@ struct mtrr_gentry /* The following functions are for use by other drivers */ # ifdef CONFIG_MTRR extern void mtrr_save_fixed_ranges(void *); +extern void mtrr_save_state(void); extern int mtrr_add (unsigned long base, unsigned long size, unsigned int type, char increment); extern int mtrr_add_page (unsigned long base, unsigned long size, @@ -81,6 +82,7 @@ extern void mtrr_ap_init(void); extern void mtrr_bp_init(void); # else #define mtrr_save_fixed_ranges(arg) do {} while (0) +#define mtrr_save_state() do {} while (0) static __inline__ int mtrr_add (unsigned long base, unsigned long size, unsigned int type, char increment) { diff --git a/include/asm-x86_64/mtrr.h b/include/asm-x86_64/mtrr.h index 1b326cbb930..b557c486bef 100644 --- a/include/asm-x86_64/mtrr.h +++ b/include/asm-x86_64/mtrr.h @@ -139,10 +139,12 @@ struct mtrr_gentry32 extern void mtrr_ap_init(void); extern void mtrr_bp_init(void); extern void mtrr_save_fixed_ranges(void *); +extern void mtrr_save_state(void); #else #define mtrr_ap_init() do {} while (0) #define mtrr_bp_init() do {} while (0) #define mtrr_save_fixed_ranges(arg) do {} while (0) +#define mtrr_save_state() do {} while (0) #endif #endif /* __KERNEL__ */ |