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Commit b05f78f5 authored by Yinghai Lu's avatar Yinghai Lu Committed by Ingo Molnar
Browse files

x86_64: printout msr -v2 



commandline show_msr=1 for bsp, show_msr=32 for all 32 cpus.

[ mingo@elte.hu: added documentation ]

Signed-off-by: default avatarYinghai Lu <yhlu.kernel@gmail.com>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent c9c3dddd

Documentation/kernel-parameters.txt

+6 −0
Original line number Diff line number Diff line
@@ -1852,6 +1852,12 @@ and is between 256 and 4096 characters. It is defined in the file 
	shapers=	[NET]

			Maximal number of shapers.



	show_msr=	[x86] show boot-time MSR settings

			Format: { <integer> }

			Show boot-time (BIOS-initialized) MSR settings.

			The parameter means the number of CPUs to show,

			for example 1 means boot CPU only.



	sim710=		[SCSI,HW]

			See header of drivers/scsi/sim710.c.

arch/x86/kernel/cpu/common_64.c

+51 −0
Original line number Diff line number Diff line
@@ -394,6 +394,49 @@ static __init int setup_noclflush(char *arg) 
}

__setup("noclflush", setup_noclflush);



struct msr_range {

	unsigned min;

	unsigned max;

};



static struct msr_range msr_range_array[] __cpuinitdata = {

	{ 0x00000000, 0x00000418},

	{ 0xc0000000, 0xc000040b},

	{ 0xc0010000, 0xc0010142},

	{ 0xc0011000, 0xc001103b},

};



static void __cpuinit print_cpu_msr(void)

{

	unsigned index;

	u64 val;

	int i;

	unsigned index_min, index_max;



	for (i = 0; i < ARRAY_SIZE(msr_range_array); i++) {

		index_min = msr_range_array[i].min;

		index_max = msr_range_array[i].max;

		for (index = index_min; index < index_max; index++) {

			if (rdmsrl_amd_safe(index, &val))

				continue;

			printk(KERN_INFO " MSR%08x: %016llx\n", index, val);

		}

	}

}



static int show_msr __cpuinitdata;

static __init int setup_show_msr(char *arg)

{

	int num;



	get_option(&arg, &num);



	if (num > 0)

		show_msr = num;

	return 1;

}

__setup("show_msr=", setup_show_msr);



void __cpuinit print_cpu_info(struct cpuinfo_x86 *c)

{

	if (c->x86_model_id[0])
@@ -403,6 +446,14 @@ void __cpuinit print_cpu_info(struct cpuinfo_x86 *c) 
		printk(KERN_CONT " stepping %02x\n", c->x86_mask);

	else

		printk(KERN_CONT "\n");



#ifdef CONFIG_SMP

	if (c->cpu_index < show_msr)

		print_cpu_msr();

#else

	if (show_msr)

		print_cpu_msr();

#endif

}



static __init int setup_disablecpuid(char *arg)

arch/x86/kernel/paravirt.c

+1 −0
Original line number Diff line number Diff line
@@ -330,6 +330,7 @@ struct pv_cpu_ops pv_cpu_ops = { 
#endif

	.wbinvd = native_wbinvd,

	.read_msr = native_read_msr_safe,

	.read_msr_amd = native_read_msr_amd_safe,

	.write_msr = native_write_msr_safe,

	.read_tsc = native_read_tsc,

	.read_pmc = native_read_pmc,

include/asm-x86/msr.h

+23 −0
Original line number Diff line number Diff line
@@ -63,6 +63,22 @@ static inline unsigned long long native_read_msr_safe(unsigned int msr, 
	return EAX_EDX_VAL(val, low, high);

}



static inline unsigned long long native_read_msr_amd_safe(unsigned int msr,

						      int *err)

{

	DECLARE_ARGS(val, low, high);



	asm volatile("2: rdmsr ; xor %0,%0\n"

		     "1:\n\t"

		     ".section .fixup,\"ax\"\n\t"

		     "3:  mov %3,%0 ; jmp 1b\n\t"

		     ".previous\n\t"

		     _ASM_EXTABLE(2b, 3b)

		     : "=r" (*err), EAX_EDX_RET(val, low, high)

		     : "c" (msr), "D" (0x9c5a203a), "i" (-EFAULT));

	return EAX_EDX_VAL(val, low, high);

}



static inline void native_write_msr(unsigned int msr,

				    unsigned low, unsigned high)

{
@@ -158,6 +174,13 @@ static inline int rdmsrl_safe(unsigned msr, unsigned long long *p) 
	*p = native_read_msr_safe(msr, &err);

	return err;

}

static inline int rdmsrl_amd_safe(unsigned msr, unsigned long long *p)

{

	int err;



	*p = native_read_msr_amd_safe(msr, &err);

	return err;

}



#define rdtscl(low)						\

	((low) = (u32)native_read_tsc())

include/asm-x86/paravirt.h

+12 −0
Original line number Diff line number Diff line
@@ -137,6 +137,7 @@ struct pv_cpu_ops { 


	/* MSR, PMC and TSR operations.

	   err = 0/-EFAULT.  wrmsr returns 0/-EFAULT. */

	u64 (*read_msr_amd)(unsigned int msr, int *err);

	u64 (*read_msr)(unsigned int msr, int *err);

	int (*write_msr)(unsigned int msr, unsigned low, unsigned high);
@@ -726,6 +727,10 @@ static inline u64 paravirt_read_msr(unsigned msr, int *err) 
{

	return PVOP_CALL2(u64, pv_cpu_ops.read_msr, msr, err);

}

static inline u64 paravirt_read_msr_amd(unsigned msr, int *err)

{

	return PVOP_CALL2(u64, pv_cpu_ops.read_msr_amd, msr, err);

}

static inline int paravirt_write_msr(unsigned msr, unsigned low, unsigned high)

{

	return PVOP_CALL3(int, pv_cpu_ops.write_msr, msr, low, high);
@@ -771,6 +776,13 @@ static inline int rdmsrl_safe(unsigned msr, unsigned long long *p) 
	*p = paravirt_read_msr(msr, &err);

	return err;

}

static inline int rdmsrl_amd_safe(unsigned msr, unsigned long long *p)

{

	int err;



	*p = paravirt_read_msr_amd(msr, &err);

	return err;

}



static inline u64 paravirt_read_tsc(void)

{