ACPI: create /sys/firmware/acpi/interrupts

See Documentation/ABI/testing/sysfs-firmware-acpi

Based-on-original-patch-by: Luming Yu <luming.yu@intel.com>
Acked-by: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: Len Brown <len.brown@intel.com>

1 files changed, 208 insertions, 0 deletions

diff --git a/drivers/acpi/system.c b/drivers/acpi/system.c
index 5ffe0ea18967..ce881713f7a6 100644
--- a/drivers/acpi/system.c
+++ b/drivers/acpi/system.c
@@ -40,6 +40,8 @@ ACPI_MODULE_NAME("system");
 #define ACPI_SYSTEM_CLASS               "system"
 #define ACPI_SYSTEM_DEVICE_NAME         "System"
 
+u32 acpi_irq_handled;
+
 /*
  * Make ACPICA version work as module param
  */
@@ -166,6 +168,212 @@ static int acpi_system_sysfs_init(void)
         return 0;
 }
 
+/*
+ * Detailed ACPI IRQ counters in /sys/firmware/acpi/interrupts/
+ * See Documentation/ABI/testing/sysfs-firmware-acpi
+ */
+
+#define COUNT_GPE 0
+#define COUNT_SCI 1     /* acpi_irq_handled */
+#define COUNT_ERROR 2   /* other */
+#define NUM_COUNTERS_EXTRA 3
+
+static u32 *all_counters;
+static u32 num_gpes;
+static u32 num_counters;
+static struct attribute **all_attrs;
+static u32 acpi_gpe_count;
+
+static struct attribute_group interrupt_stats_attr_group = {
+        .name = "interrupts",
+};
+static struct kobj_attribute *counter_attrs;
+
+static int count_num_gpes(void)
+{
+        int count = 0;
+        struct acpi_gpe_xrupt_info *gpe_xrupt_info;
+        struct acpi_gpe_block_info *gpe_block;
+        acpi_cpu_flags flags;
+
+        flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
+
+        gpe_xrupt_info = acpi_gbl_gpe_xrupt_list_head;
+        while (gpe_xrupt_info) {
+                gpe_block = gpe_xrupt_info->gpe_block_list_head;
+                while (gpe_block) {
+                        count += gpe_block->register_count *
+                            ACPI_GPE_REGISTER_WIDTH;
+                        gpe_block = gpe_block->next;
+                }
+                gpe_xrupt_info = gpe_xrupt_info->next;
+        }
+        acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
+
+        return count;
+}
+
+static void delete_gpe_attr_array(void)
+{
+        u32 *tmp = all_counters;
+
+        all_counters = NULL;
+        kfree(tmp);
+
+        if (counter_attrs) {
+                int i;
+
+                for (i = 0; i < num_gpes; i++)
+                        kfree(counter_attrs[i].attr.name);
+
+                kfree(counter_attrs);
+        }
+        kfree(all_attrs);
+
+        return;
+}
+
+void acpi_os_gpe_count(u32 gpe_number)
+{
+        acpi_gpe_count++;
+
+        if (!all_counters)
+                return;
+
+        if (gpe_number < num_gpes)
+                all_counters[gpe_number]++;
+        else
+                all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_ERROR]++;
+
+        return;
+}
+
+void acpi_os_fixed_event_count(u32 event_number)
+{
+        if (!all_counters)
+                return;
+
+        if (event_number < ACPI_NUM_FIXED_EVENTS)
+                all_counters[num_gpes + event_number]++;
+        else
+                all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_ERROR]++;
+
+        return;
+}
+
+static ssize_t counter_show(struct kobject *kobj,
+        struct kobj_attribute *attr, char *buf)
+{
+        all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI] =
+                acpi_irq_handled;
+        all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_GPE] =
+                acpi_gpe_count;
+
+        return sprintf(buf, "%d\n", all_counters[attr - counter_attrs]);
+}
+
+/*
+ * counter_set() sets the specified counter.
+ * setting the total "sci" file to any value clears all counters.
+ */
+static ssize_t counter_set(struct kobject *kobj,
+        struct kobj_attribute *attr, const char *buf, size_t size)
+{
+        int index = attr - counter_attrs;
+
+        if (index == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI) {
+                int i;
+                for (i = 0; i < num_counters; ++i)
+                        all_counters[i] = 0;
+                acpi_gpe_count = 0;
+                acpi_irq_handled = 0;
+
+        } else
+                all_counters[index] = strtoul(buf, NULL, 0);
+
+        return size;
+}
+
+void acpi_irq_stats_init(void)
+{
+        int i;
+
+        if (all_counters)
+                return;
+
+        num_gpes = count_num_gpes();
+        num_counters = num_gpes + ACPI_NUM_FIXED_EVENTS + NUM_COUNTERS_EXTRA;
+
+        all_attrs = kzalloc(sizeof(struct attribute *) * (num_counters + 1),
+                        GFP_KERNEL);
+        if (all_attrs == NULL)
+                return;
+
+        all_counters = kzalloc(sizeof(u32) * (num_counters), GFP_KERNEL);
+        if (all_counters == NULL)
+                goto fail;
+
+        counter_attrs = kzalloc(sizeof(struct kobj_attribute) * (num_counters),
+                        GFP_KERNEL);
+        if (counter_attrs == NULL)
+                goto fail;
+
+        for (i = 0; i < num_counters; ++i) {
+                char buffer[10];
+                char *name;
+
+                if (i < num_gpes)
+                        sprintf(buffer, "gpe%02X", i);
+                else if (i == num_gpes + ACPI_EVENT_PMTIMER)
+                        sprintf(buffer, "ff_pmtimer");
+                else if (i == num_gpes + ACPI_EVENT_GLOBAL)
+                        sprintf(buffer, "ff_gbl_lock");
+                else if (i == num_gpes + ACPI_EVENT_POWER_BUTTON)
+                        sprintf(buffer, "ff_pwr_btn");
+                else if (i == num_gpes + ACPI_EVENT_SLEEP_BUTTON)
+                        sprintf(buffer, "ff_slp_btn");
+                else if (i == num_gpes + ACPI_EVENT_RTC)
+                        sprintf(buffer, "ff_rt_clk");
+                else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_GPE)
+                        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_ERROR)
+                        sprintf(buffer, "error");
+                else
+                        sprintf(buffer, "bug%02X", i);
+
+                name = kzalloc(strlen(buffer) + 1, GFP_KERNEL);
+                if (name == NULL)
+                        goto fail;
+                strncpy(name, buffer, strlen(buffer) + 1);
+
+                counter_attrs[i].attr.name = name;
+                counter_attrs[i].attr.mode = 0644;
+                counter_attrs[i].show = counter_show;
+                counter_attrs[i].store = counter_set;
+
+                all_attrs[i] = &counter_attrs[i].attr;
+        }
+
+        interrupt_stats_attr_group.attrs = all_attrs;
+        sysfs_create_group(acpi_kobj, &interrupt_stats_attr_group);
+        return;
+
+fail:
+        delete_gpe_attr_array();
+        return;
+}
+
+static void __exit interrupt_stats_exit(void)
+{
+        sysfs_remove_group(acpi_kobj, &interrupt_stats_attr_group);
+
+        delete_gpe_attr_array();
+
+        return;
+}
+
 /* --------------------------------------------------------------------------
                               FS Interface (/proc)
    -------------------------------------------------------------------------- */