From: Thomas Gleixner <tglx@linutronix.de>
Date: Mon, 9 Jun 2008 15:27:20 +0000 (+0200)
Subject: x86: use cpuinfo to check for interrupt pending message msr
X-Git-Tag: v2.6.27-rc1~1106^2~251^8~9
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=732d7be17b98ebfd59e5864c3490f19856fa832c;p=linux-2.6

x86: use cpuinfo to check for interrupt pending message msr

Simplify code: no need to do a cpuid(1) again. The cpuinfo structure
has all necessary information already.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---

diff --git a/arch/x86/kernel/cpu/amd.c b/arch/x86/kernel/cpu/amd.c
index 30b5055be3..e76b49e7a9 100644
--- a/arch/x86/kernel/cpu/amd.c
+++ b/arch/x86/kernel/cpu/amd.c
@@ -25,35 +25,24 @@ extern void vide(void);
 __asm__(".align 4\nvide: ret");
 
 #ifdef CONFIG_X86_LOCAL_APIC
-#define CPUID_PROCESSOR_SIGNATURE       1
-#define CPUID_XFAM              0x0ff00000
-#define CPUID_XFAM_K8           0x00000000
-#define CPUID_XFAM_10H          0x00100000
-#define CPUID_XFAM_11H          0x00200000
-#define CPUID_XMOD              0x000f0000
-#define CPUID_XMOD_REV_F        0x00040000
 
 /* AMD systems with C1E don't have a working lAPIC timer. Check for that. */
-static __cpuinit int amd_apic_timer_broken(void)
+static __cpuinit int amd_apic_timer_broken(struct cpuinfo_x86 *c)
 {
 	u32 lo, hi;
-	u32 eax = cpuid_eax(CPUID_PROCESSOR_SIGNATURE);
-	switch (eax & CPUID_XFAM) {
-	case CPUID_XFAM_K8:
-		if ((eax & CPUID_XMOD) < CPUID_XMOD_REV_F)
-			break;
-	case CPUID_XFAM_10H:
-	case CPUID_XFAM_11H:
-		rdmsr(MSR_K8_INT_PENDING_MSG, lo, hi);
-		if (lo & K8_INTP_C1E_ACTIVE_MASK) {
-			if (smp_processor_id() != boot_cpu_physical_apicid)
-				printk(KERN_INFO "AMD C1E detected late. "
-				       "	Force timer broadcast.\n");
-			return 1;
-		}
-		break;
-	default:
-		/* err on the side of caution */
+
+	if (c->x86 < 0x0F)
+		return 0;
+
+	/* Family 0x0f models < rev F do not have this MSR */
+	if (c->x86 == 0x0f && c->x86_model < 0x40)
+		return 0;
+
+	rdmsr(MSR_K8_INT_PENDING_MSG, lo, hi);
+	if (lo & K8_INTP_C1E_ACTIVE_MASK) {
+		if (smp_processor_id() != boot_cpu_physical_apicid)
+			printk(KERN_INFO "AMD C1E detected late. "
+			       "Force timer broadcast.\n");
 		return 1;
 	}
 	return 0;
@@ -297,7 +286,7 @@ static void __cpuinit init_amd(struct cpuinfo_x86 *c)
 	}
 
 #ifdef CONFIG_X86_LOCAL_APIC
-	if (amd_apic_timer_broken())
+	if (amd_apic_timer_broken(c))
 		local_apic_timer_disabled = 1;
 #endif
 
diff --git a/arch/x86/kernel/cpu/amd_64.c b/arch/x86/kernel/cpu/amd_64.c
index 6eef3c79d1..f5fc161d8f 100644
--- a/arch/x86/kernel/cpu/amd_64.c
+++ b/arch/x86/kernel/cpu/amd_64.c
@@ -110,31 +110,23 @@ static void __cpuinit early_init_amd_mc(struct cpuinfo_x86 *c)
 #endif
 }
 
-#define CPUID_PROCESSOR_SIGNATURE	1
-#define CPUID_XFAM		0x0ff00000
-#define CPUID_XFAM_K8		0x00000000
-#define CPUID_XFAM_10H		0x00100000
-#define CPUID_XFAM_11H		0x00200000
-#define CPUID_XMOD		0x000f0000
-#define CPUID_XMOD_REV_F	0x00040000
-
 /* AMD systems with C1E don't have a working lAPIC timer. Check for that. */
-static __cpuinit int amd_apic_timer_broken(void)
+static __cpuinit int amd_apic_timer_broken(struct cpuinfo_x86 *c)
 {
-	u32 lo, hi, eax = cpuid_eax(CPUID_PROCESSOR_SIGNATURE);
+	u32 lo, hi;
 
-	switch (eax & CPUID_XFAM) {
-	case CPUID_XFAM_K8:
-		if ((eax & CPUID_XMOD) < CPUID_XMOD_REV_F)
-			break;
-	case CPUID_XFAM_10H:
-	case CPUID_XFAM_11H:
-		rdmsr(MSR_K8_INT_PENDING_MSG, lo, hi);
-		if (lo & K8_INTP_C1E_ACTIVE_MASK)
-			return 1;
-		break;
-	default:
-		/* err on the side of caution */
+	if (c->x86 < 0x0F)
+		return 0;
+
+	/* Family 0x0f models < rev F do not have this MSR */
+	if (c->x86 == 0x0f && c->x86_model < 0x40)
+		return 0;
+
+	rdmsr(MSR_K8_INT_PENDING_MSG, lo, hi);
+	if (lo & K8_INTP_C1E_ACTIVE_MASK) {
+		if (smp_processor_id() != boot_cpu_physical_apicid)
+			printk(KERN_INFO "AMD C1E detected late. "
+			       "Force timer broadcast.\n");
 		return 1;
 	}
 	return 0;
@@ -220,7 +212,7 @@ void __cpuinit init_amd(struct cpuinfo_x86 *c)
 	if (c->x86 == 0x10)
 		amd_enable_pci_ext_cfg(c);
 
-	if (amd_apic_timer_broken())
+	if (amd_apic_timer_broken(c))
 		disable_apic_timer = 1;
 
 	if (c == &boot_cpu_data && c->x86 >= 0xf && c->x86 <= 0x11) {