x86/mce: Create helper function to save addr/misc when needed

[platform/adaptation/renesas_rcar/renesas_kernel.git] / arch / x86 / kernel / cpu / mcheck / mce.c

diff --git a/arch/x86/kernel/cpu/mcheck/mce.c b/arch/x86/kernel/cpu/mcheck/mce.c
index 2af127d..2f1c200 100644 (file)
--- a/arch/x86/kernel/cpu/mcheck/mce.c
+++ b/arch/x86/kernel/cpu/mcheck/mce.c
@@ -492,6 +492,27 @@ static void mce_report_event(struct pt_regs *regs)
        irq_work_queue(&__get_cpu_var(mce_irq_work));
 }
 
+/*
+ * Read ADDR and MISC registers.
+ */
+static void mce_read_aux(struct mce *m, int i)
+{
+       if (m->status & MCI_STATUS_MISCV)
+               m->misc = mce_rdmsrl(MSR_IA32_MCx_MISC(i));
+       if (m->status & MCI_STATUS_ADDRV) {
+               m->addr = mce_rdmsrl(MSR_IA32_MCx_ADDR(i));
+
+               /*
+                * Mask the reported address by the reported granularity.
+                */
+               if (mce_ser && (m->status & MCI_STATUS_MISCV)) {
+                       u8 shift = MCI_MISC_ADDR_LSB(m->misc);
+                       m->addr >>= shift;
+                       m->addr <<= shift;
+               }
+       }
+}
+
 DEFINE_PER_CPU(unsigned, mce_poll_count);
 
 /*
@@ -542,10 +563,7 @@ void machine_check_poll(enum mcp_flags flags, mce_banks_t *b)
                    (m.status & (mce_ser ? MCI_STATUS_S : MCI_STATUS_UC)))
                        continue;
 
-               if (m.status & MCI_STATUS_MISCV)
-                       m.misc = mce_rdmsrl(MSR_IA32_MCx_MISC(i));
-               if (m.status & MCI_STATUS_ADDRV)
-                       m.addr = mce_rdmsrl(MSR_IA32_MCx_ADDR(i));
+               mce_read_aux(&m, i);
 
                if (!(flags & MCP_TIMESTAMP))
                        m.tsc = 0;
@@ -981,10 +999,7 @@ void do_machine_check(struct pt_regs *regs, long error_code)
                if (severity == MCE_AR_SEVERITY)
                        kill_it = 1;
 
-               if (m.status & MCI_STATUS_MISCV)
-                       m.misc = mce_rdmsrl(MSR_IA32_MCx_MISC(i));
-               if (m.status & MCI_STATUS_ADDRV)
-                       m.addr = mce_rdmsrl(MSR_IA32_MCx_ADDR(i));
+               mce_read_aux(&m, i);
 
                /*
                 * Action optional error. Queue address for later processing.
@@ -1046,11 +1061,15 @@ out:
 }
 EXPORT_SYMBOL_GPL(do_machine_check);
 
-/* dummy to break dependency. actual code is in mm/memory-failure.c */
-void __attribute__((weak)) memory_failure(unsigned long pfn, int vector)
+#ifndef CONFIG_MEMORY_FAILURE
+int memory_failure(unsigned long pfn, int vector, int flags)
 {
-       printk(KERN_ERR "Action optional memory failure at %lx ignored\n", pfn);
+       printk(KERN_ERR "Uncorrected memory error in page 0x%lx ignored\n"
+               "Rebuild kernel with CONFIG_MEMORY_FAILURE=y for smarter handling\n", pfn);
+
+       return 0;
 }
+#endif
 
 /*
  * Called after mce notification in process context. This code
@@ -1068,7 +1087,7 @@ void mce_notify_process(void)
        unsigned long pfn;
        mce_notify_irq();
        while (mce_ring_get(&pfn))
-               memory_failure(pfn, MCE_VECTOR);
+               memory_failure(pfn, MCE_VECTOR, 0);
 }
 
 static void mce_process_work(struct work_struct *dummy)