ACPI, eMCA: Combine eMCA/EDAC event reporting priority

eMCA has higher H/W event reporting priority. Once it is
loaded, EDAC event reporting should be disabled, unless EDAC
overrides eMCA priority via command line parameter "edac_report=force".

Signed-off-by: Chen, Gong <gong.chen@linux.intel.com>
Acked-by: Tony Luck <tony.luck@intel.com>
Link: http://lkml.kernel.org/r/1386310630-12529-4-git-send-email-gong.chen@linux.intel.com
[ Boris: massage printk message. ]
Signed-off-by: Borislav Petkov <bp@suse.de>

diff --git a/drivers/acpi/acpi_extlog.c b/drivers/acpi/acpi_extlog.c
index a6869e1..5d33c54 100644 (file)
--- a/drivers/acpi/acpi_extlog.c
+++ b/drivers/acpi/acpi_extlog.c
@@ -12,6 +12,7 @@
 #include <acpi/acpi_bus.h>
 #include <linux/cper.h>
 #include <linux/ratelimit.h>
+#include <linux/edac.h>
 #include <asm/cpu.h>
 #include <asm/mce.h>
 
@@ -43,6 +44,8 @@ struct extlog_l1_head {
        u8  rev1[12];
 };
 
+static int old_edac_report_status;
+
 static u8 extlog_dsm_uuid[] = "663E35AF-CC10-41A4-88EA-5470AF055295";
 
 /* L1 table related physical address */
@@ -150,7 +153,7 @@ static int extlog_print(struct notifier_block *nb, unsigned long val,
 
        rc = print_extlog_rcd(NULL, (struct acpi_generic_status *)elog_buf, cpu);
 
-       return NOTIFY_DONE;
+       return NOTIFY_STOP;
 }
 
 static int extlog_get_dsm(acpi_handle handle, int rev, int func, u64 *ret)
@@ -231,8 +234,12 @@ static int __init extlog_init(void)
        u64 cap;
        int rc;
 
-       rc = -ENODEV;
+       if (get_edac_report_status() == EDAC_REPORTING_FORCE) {
+               pr_warn("Not loading eMCA, error reporting force-enabled through EDAC.\n");
+               return -EPERM;
+       }
 
+       rc = -ENODEV;
        rdmsrl(MSR_IA32_MCG_CAP, cap);
        if (!(cap & MCG_ELOG_P))
                return rc;
@@ -287,6 +294,12 @@ static int __init extlog_init(void)
        if (elog_buf == NULL)
                goto err_release_elog;
 
+       /*
+        * eMCA event report method has higher priority than EDAC method,
+        * unless EDAC event report method is mandatory.
+        */
+       old_edac_report_status = get_edac_report_status();
+       set_edac_report_status(EDAC_REPORTING_DISABLED);
        mce_register_decode_chain(&extlog_mce_dec);
        /* enable OS to be involved to take over management from BIOS */
        ((struct extlog_l1_head *)extlog_l1_addr)->flags |= FLAG_OS_OPTIN;
@@ -308,6 +321,7 @@ err:
 
 static void __exit extlog_exit(void)
 {
+       set_edac_report_status(old_edac_report_status);
        mce_unregister_decode_chain(&extlog_mce_dec);
        ((struct extlog_l1_head *)extlog_l1_addr)->flags &= ~FLAG_OS_OPTIN;
        if (extlog_l1_addr)