ACPI: add /sys/firmware/acpi/interrupts/sci_not counter

This counter may prove useful in debugging some
spurious interrupt issues seen in the field.

Signed-off-by: Len Brown <len.brown@intel.com>

4 files changed, 19 insertions, 5 deletions

diff --git a/Documentation/ABI/testing/sysfs-firmware-acpi b/Documentation/ABI/testing/sysfs-firmware-acpi
index e8ffc70ffe12..4f9ba3c2fca7 100644
--- a/Documentation/ABI/testing/sysfs-firmware-acpi
+++ b/Documentation/ABI/testing/sysfs-firmware-acpi
@@ -69,9 +69,13 @@ Description:
                 gpe1F:       0  invalid
                 gpe_all:    1192
                 sci:    1194
+                sci_not:     0  
 
-                sci - The total number of times the ACPI SCI
-                has claimed an interrupt.
+                sci - The number of times the ACPI SCI
+                has been called and claimed an interrupt.
+
+                sci_not - The number of times the ACPI SCI
+                has been called and NOT claimed an interrupt.
 
                 gpe_all - count of SCI caused by GPEs.
 
diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c
index d59f08ecaf16..d916bea729f1 100644
--- a/drivers/acpi/osl.c
+++ b/drivers/acpi/osl.c
@@ -353,8 +353,10 @@ static irqreturn_t acpi_irq(int irq, void *dev_id)
         if (handled) {
                 acpi_irq_handled++;
                 return IRQ_HANDLED;
-        } else
+        } else {
+                acpi_irq_not_handled++;
                 return IRQ_NONE;
+        }
 }
 
 acpi_status
diff --git a/drivers/acpi/system.c b/drivers/acpi/system.c
index da51f05ef8d8..0944daec064f 100644
--- a/drivers/acpi/system.c
+++ b/drivers/acpi/system.c
@@ -38,6 +38,7 @@ ACPI_MODULE_NAME("system");
 #define ACPI_SYSTEM_DEVICE_NAME         "System"
 
 u32 acpi_irq_handled;
+u32 acpi_irq_not_handled;
 
 /*
  * Make ACPICA version work as module param
@@ -214,8 +215,9 @@ err:
 
 #define COUNT_GPE 0
 #define COUNT_SCI 1     /* acpi_irq_handled */
-#define COUNT_ERROR 2   /* other */
-#define NUM_COUNTERS_EXTRA 3
+#define COUNT_SCI_NOT 2 /* acpi_irq_not_handled */
+#define COUNT_ERROR 3   /* other */
+#define NUM_COUNTERS_EXTRA 4
 
 struct event_counter {
         u32 count;
@@ -317,6 +319,8 @@ static ssize_t counter_show(struct kobject *kobj,
 
         all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI].count =
                 acpi_irq_handled;
+        all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI_NOT].count =
+                acpi_irq_not_handled;
         all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_GPE].count =
                 acpi_gpe_count;
 
@@ -363,6 +367,7 @@ static ssize_t counter_set(struct kobject *kobj,
                         all_counters[i].count = 0;
                 acpi_gpe_count = 0;
                 acpi_irq_handled = 0;
+                acpi_irq_not_handled = 0;
                 goto end;
         }
 
@@ -456,6 +461,8 @@ void acpi_irq_stats_init(void)
                         sprintf(buffer, "gpe_all");
                 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI)
                         sprintf(buffer, "sci");
+                else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI_NOT)
+                        sprintf(buffer, "sci_not");
                 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_ERROR)
                         sprintf(buffer, "error");
                 else
diff --git a/include/linux/acpi.h b/include/linux/acpi.h
index 6586cbd0d4af..88be890ee3c7 100644
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -111,6 +111,7 @@ int acpi_register_ioapic(acpi_handle handle, u64 phys_addr, u32 gsi_base);
 int acpi_unregister_ioapic(acpi_handle handle, u32 gsi_base);
 void acpi_irq_stats_init(void);
 extern u32 acpi_irq_handled;
+extern u32 acpi_irq_not_handled;
 
 extern struct acpi_mcfg_allocation *pci_mmcfg_config;
 extern int pci_mmcfg_config_num;