[PATCH] x86: Temporarily revert parts of the Core 2 nmi nmi watchdog support

This makes merging easier.  They are readded a few patches later.

Signed-off-by: Andi Kleen <ak@suse.de>

1 files changed, 5 insertions, 76 deletions

diff --git a/arch/x86_64/kernel/nmi.c b/arch/x86_64/kernel/nmi.c
index 5baa0c726e97..42c05d6907b9 100644
--- a/arch/x86_64/kernel/nmi.c
+++ b/arch/x86_64/kernel/nmi.c
@@ -26,7 +26,6 @@
 #include <asm/proto.h>
 #include <asm/kdebug.h>
 #include <asm/mce.h>
-#include <asm/intel_arch_perfmon.h>
 
 /*
  * lapic_nmi_owner tracks the ownership of the lapic NMI hardware:
@@ -66,9 +65,6 @@ static unsigned int nmi_p4_cccr_val;
 #define K7_EVENT_CYCLES_PROCESSOR_IS_RUNNING    0x76
 #define K7_NMI_EVENT            K7_EVENT_CYCLES_PROCESSOR_IS_RUNNING
 
-#define ARCH_PERFMON_NMI_EVENT_SEL      ARCH_PERFMON_UNHALTED_CORE_CYCLES_SEL
-#define ARCH_PERFMON_NMI_EVENT_UMASK    ARCH_PERFMON_UNHALTED_CORE_CYCLES_UMASK
-
 #define MSR_P4_MISC_ENABLE      0x1A0
 #define MSR_P4_MISC_ENABLE_PERF_AVAIL   (1<<7)
 #define MSR_P4_MISC_ENABLE_PEBS_UNAVAIL (1<<12)
@@ -100,10 +96,7 @@ static __cpuinit inline int nmi_known_cpu(void)
         case X86_VENDOR_AMD:
                 return boot_cpu_data.x86 == 15;
         case X86_VENDOR_INTEL:
-                if (cpu_has(&boot_cpu_data, X86_FEATURE_ARCH_PERFMON))
-                        return 1;
-                else
-                        return (boot_cpu_data.x86 == 15);
+                return boot_cpu_data.x86 == 15;
         }
         return 0;
 }
@@ -209,8 +202,6 @@ int __init setup_nmi_watchdog(char *str)
 
 __setup("nmi_watchdog=", setup_nmi_watchdog);
 
-static void disable_intel_arch_watchdog(void);
-
 static void disable_lapic_nmi_watchdog(void)
 {
         if (nmi_active <= 0)
@@ -223,8 +214,6 @@ static void disable_lapic_nmi_watchdog(void)
                 if (boot_cpu_data.x86 == 15) {
                         wrmsr(MSR_P4_IQ_CCCR0, 0, 0);
                         wrmsr(MSR_P4_CRU_ESCR0, 0, 0);
-                } else if (cpu_has(&boot_cpu_data, X86_FEATURE_ARCH_PERFMON)) {
-                        disable_intel_arch_watchdog();
                 }
                 break;
         }
@@ -377,53 +366,6 @@ static void setup_k7_watchdog(void)
         wrmsr(MSR_K7_EVNTSEL0, evntsel, 0);
 }
 
-static void disable_intel_arch_watchdog(void)
-{
-        unsigned ebx;
-
-        /*
-         * Check whether the Architectural PerfMon supports
-         * Unhalted Core Cycles Event or not.
-         * NOTE: Corresponding bit = 0 in ebp indicates event present.
-         */
-        ebx = cpuid_ebx(10);
-        if (!(ebx & ARCH_PERFMON_UNHALTED_CORE_CYCLES_PRESENT))
-                wrmsr(MSR_ARCH_PERFMON_EVENTSEL0, 0, 0);
-}
-
-static int setup_intel_arch_watchdog(void)
-{
-        unsigned int evntsel;
-        unsigned ebx;
-
-        /*
-         * Check whether the Architectural PerfMon supports
-         * Unhalted Core Cycles Event or not.
-         * NOTE: Corresponding bit = 0 in ebp indicates event present.
-         */
-        ebx = cpuid_ebx(10);
-        if ((ebx & ARCH_PERFMON_UNHALTED_CORE_CYCLES_PRESENT))
-                return 0;
-
-        nmi_perfctr_msr = MSR_ARCH_PERFMON_PERFCTR0;
-
-        clear_msr_range(MSR_ARCH_PERFMON_EVENTSEL0, 2);
-        clear_msr_range(MSR_ARCH_PERFMON_PERFCTR0, 2);
-
-        evntsel = ARCH_PERFMON_EVENTSEL_INT
-                | ARCH_PERFMON_EVENTSEL_OS
-                | ARCH_PERFMON_EVENTSEL_USR
-                | ARCH_PERFMON_NMI_EVENT_SEL
-                | ARCH_PERFMON_NMI_EVENT_UMASK;
-
-        wrmsr(MSR_ARCH_PERFMON_EVENTSEL0, evntsel, 0);
-        wrmsrl(MSR_ARCH_PERFMON_PERFCTR0, -((u64)cpu_khz * 1000 / nmi_hz));
-        apic_write(APIC_LVTPC, APIC_DM_NMI);
-        evntsel |= ARCH_PERFMON_EVENTSEL0_ENABLE;
-        wrmsr(MSR_ARCH_PERFMON_EVENTSEL0, evntsel, 0);
-        return 1;
-}
-
 
 static int setup_p4_watchdog(void)
 {
@@ -477,16 +419,10 @@ void setup_apic_nmi_watchdog(void)
                 setup_k7_watchdog();
                 break;
         case X86_VENDOR_INTEL:
-                if (cpu_has(&boot_cpu_data, X86_FEATURE_ARCH_PERFMON)) {
-                        if (!setup_intel_arch_watchdog())
-                                return;
-                } else if (boot_cpu_data.x86 == 15) {
-                        if (!setup_p4_watchdog())
-                                return;
-                } else {
+                if (boot_cpu_data.x86 != 15)
+                        return;
+                if (!setup_p4_watchdog())
                         return;
-                }
-
                 break;
 
         default:
@@ -571,14 +507,7 @@ void __kprobes nmi_watchdog_tick(struct pt_regs * regs, unsigned reason)
                          */
                         wrmsr(MSR_P4_IQ_CCCR0, nmi_p4_cccr_val, 0);
                         apic_write(APIC_LVTPC, APIC_DM_NMI);
-                } else if (nmi_perfctr_msr == MSR_ARCH_PERFMON_PERFCTR0) {
-                        /*
-                         * For Intel based architectural perfmon
-                         * - LVTPC is masked on interrupt and must be
-                         *   unmasked by the LVTPC handler.
-                         */
-                        apic_write(APIC_LVTPC, APIC_DM_NMI);
-                }
+                }
                 wrmsrl(nmi_perfctr_msr, -((u64)cpu_khz * 1000 / nmi_hz));
         }
 }