ACPI: APEI: GHES: Improve ghes_notify_sea() status check

Performance testing on ARMv8 systems shows significant overhead in error
status handling in SEA error handling.

- ghes_peek_estatus(): 8,138.3 ns (21,160 cycles).
- ghes_clear_estatus(): 2,038.3 ns (5,300 cycles).

Apply the same optimization used in ghes_notify_nmi() to
ghes_notify_sea() by checking for active errors before processing,

Tested-by: Tony Luck <tony.luck@intel.com>
Reviewed-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Shuai Xue <xueshuai@linux.alibaba.com>
Reviewed-by: Hanjun Guo <guohanjun@huawei.com>
Link: https://patch.msgid.link/20260112032239.30023-4-xueshuai@linux.alibaba.com
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c
index 067a58dbcc01ae17641cc229db3a53cf58cc9681..a2ac282c99cb2a2af6d7dd09c734751e135a74eb 100644 (file)
--- a/drivers/acpi/apei/ghes.c
+++ b/drivers/acpi/apei/ghes.c
@@ -1511,6 +1511,9 @@ int ghes_notify_sea(void)
        static DEFINE_RAW_SPINLOCK(ghes_notify_lock_sea);
        int rv;
 
+       if (!ghes_has_active_errors(&ghes_sea))
+               return -ENOENT;
+
        raw_spin_lock(&ghes_notify_lock_sea);
        rv = ghes_in_nmi_spool_from_list(&ghes_sea, FIX_APEI_GHES_SEA);
        raw_spin_unlock(&ghes_notify_lock_sea);
@@ -1518,11 +1521,19 @@ int ghes_notify_sea(void)
        return rv;
 }
 
-static void ghes_sea_add(struct ghes *ghes)
+static int ghes_sea_add(struct ghes *ghes)
 {
+       int rc;
+
+       rc = ghes_map_error_status(ghes);
+       if (rc)
+               return rc;
+
        mutex_lock(&ghes_list_mutex);
        list_add_rcu(&ghes->list, &ghes_sea);
        mutex_unlock(&ghes_list_mutex);
+
+       return 0;
 }
 
 static void ghes_sea_remove(struct ghes *ghes)
@@ -1530,10 +1541,11 @@ static void ghes_sea_remove(struct ghes *ghes)
        mutex_lock(&ghes_list_mutex);
        list_del_rcu(&ghes->list);
        mutex_unlock(&ghes_list_mutex);
+       ghes_unmap_error_status(ghes);
        synchronize_rcu();
 }
 #else /* CONFIG_ACPI_APEI_SEA */
-static inline void ghes_sea_add(struct ghes *ghes) { }
+static inline int ghes_sea_add(struct ghes *ghes) { return -EINVAL; }
 static inline void ghes_sea_remove(struct ghes *ghes) { }
 #endif /* CONFIG_ACPI_APEI_SEA */
 
@@ -1765,7 +1777,9 @@ static int ghes_probe(struct platform_device *ghes_dev)
                break;
 
        case ACPI_HEST_NOTIFY_SEA:
-               ghes_sea_add(ghes);
+               rc = ghes_sea_add(ghes);
+               if (rc)
+                       goto err;
                break;
        case ACPI_HEST_NOTIFY_NMI:
                rc = ghes_nmi_add(ghes);