x86/mce: Add a struct mce.kflags field

There can be many different subsystems register on the mce handler
chain. Add a new bitmask field and define values so that handlers can
indicate whether they took any action to log or otherwise handle an
error.

The default handler at the end of the chain can use this information to
decide whether to print to the console log.

Boris suggested a generic name and leaving plenty of spare bits for
possible future use.

 [ bp: Move flag bits to the internal mce.h header and use BIT_ULL(). ]

Signed-off-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Tested-by: Tony Luck <tony.luck@intel.com>
Link: https://lkml.kernel.org/r/20200214222720.13168-4-tony.luck@intel.com

diff --git a/arch/x86/include/asm/mce.h b/arch/x86/include/asm/mce.h
index 689ac6e..5f04a24 100644 (file)
--- a/arch/x86/include/asm/mce.h
+++ b/arch/x86/include/asm/mce.h
@@ -129,6 +129,14 @@
 
 #define XEC(x, mask)                   (((x) >> 16) & mask)
 
+/* mce.kflags flag bits for logging etc. */
+#define        MCE_HANDLED_CEC         BIT_ULL(0)
+#define        MCE_HANDLED_UC          BIT_ULL(1)
+#define        MCE_HANDLED_EXTLOG      BIT_ULL(2)
+#define        MCE_HANDLED_NFIT        BIT_ULL(3)
+#define        MCE_HANDLED_EDAC        BIT_ULL(4)
+#define        MCE_HANDLED_MCELOG      BIT_ULL(5)
+
 /*
  * This structure contains all data related to the MCE log.  Also
  * carries a signature to make it easier to find from external

diff --git a/arch/x86/include/uapi/asm/mce.h b/arch/x86/include/uapi/asm/mce.h
index 955c2a2..5b59d80 100644 (file)
--- a/arch/x86/include/uapi/asm/mce.h
+++ b/arch/x86/include/uapi/asm/mce.h
@@ -35,6 +35,7 @@ struct mce {
        __u64 ipid;             /* MCA_IPID MSR: only valid on SMCA systems */
        __u64 ppin;             /* Protected Processor Inventory Number */
        __u32 microcode;        /* Microcode revision */
+       __u64 kflags;           /* Internal kernel use. See below */
 };
 
 #define MCE_GET_RECORD_LEN   _IOR('M', 1, int)