ACPI: create /sys/firmware/acpi/interrupts
[linux-2.6.git] / drivers / acpi / system.c
index 5ffe0ea..ce88171 100644 (file)
@@ -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)
    -------------------------------------------------------------------------- */