1 files changed, 45 insertions, 8 deletions

diff --git a/arch/x86/kernel/cpu/perf_event_amd_ibs.c b/arch/x86/kernel/cpu/perf_event_amd_ibs.c
index e09f0bfb7b8f..4b8e4d3cd6ea 100644
--- a/arch/x86/kernel/cpu/perf_event_amd_ibs.c
+++ b/arch/x86/kernel/cpu/perf_event_amd_ibs.c
@@ -10,6 +10,7 @@
 #include <linux/module.h>
 #include <linux/pci.h>
 #include <linux/ptrace.h>
+#include <linux/syscore_ops.h>
 
 #include <asm/apic.h>
 
@@ -816,6 +817,18 @@ out:
         return ret;
 }
 
+static void ibs_eilvt_setup(void)
+{
+        /*
+         * Force LVT offset assignment for family 10h: The offsets are
+         * not assigned by the BIOS for this family, so the OS is
+         * responsible for doing it. If the OS assignment fails, fall
+         * back to BIOS settings and try to setup this.
+         */
+        if (boot_cpu_data.x86 == 0x10)
+                force_ibs_eilvt_setup();
+}
+
 static inline int get_ibs_lvt_offset(void)
 {
         u64 val;
@@ -851,6 +864,36 @@ static void clear_APIC_ibs(void *dummy)
                 setup_APIC_eilvt(offset, 0, APIC_EILVT_MSG_FIX, 1);
 }
 
+#ifdef CONFIG_PM
+
+static int perf_ibs_suspend(void)
+{
+        clear_APIC_ibs(NULL);
+        return 0;
+}
+
+static void perf_ibs_resume(void)
+{
+        ibs_eilvt_setup();
+        setup_APIC_ibs(NULL);
+}
+
+static struct syscore_ops perf_ibs_syscore_ops = {
+        .resume         = perf_ibs_resume,
+        .suspend        = perf_ibs_suspend,
+};
+
+static void perf_ibs_pm_init(void)
+{
+        register_syscore_ops(&perf_ibs_syscore_ops);
+}
+
+#else
+
+static inline void perf_ibs_pm_init(void) { }
+
+#endif
+
 static int
 perf_ibs_cpu_notifier(struct notifier_block *self, unsigned long action, void *hcpu)
 {
@@ -877,18 +920,12 @@ static __init int amd_ibs_init(void)
         if (!caps)
                 return -ENODEV; /* ibs not supported by the cpu */
 
-        /*
-         * Force LVT offset assignment for family 10h: The offsets are
-         * not assigned by the BIOS for this family, so the OS is
-         * responsible for doing it. If the OS assignment fails, fall
-         * back to BIOS settings and try to setup this.
-         */
-        if (boot_cpu_data.x86 == 0x10)
-                force_ibs_eilvt_setup();
+        ibs_eilvt_setup();
 
         if (!ibs_eilvt_valid())
                 goto out;
 
+        perf_ibs_pm_init();
         get_online_cpus();
         ibs_caps = caps;
         /* make ibs_caps visible to other cpus: */