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path: root/drivers/acpi/sysfs.c
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Diffstat (limited to 'drivers/acpi/sysfs.c')
-rw-r--r--drivers/acpi/sysfs.c133
1 files changed, 98 insertions, 35 deletions
diff --git a/drivers/acpi/sysfs.c b/drivers/acpi/sysfs.c
index 0876d77b3..40a426552 100644
--- a/drivers/acpi/sysfs.c
+++ b/drivers/acpi/sysfs.c
@@ -69,6 +69,8 @@ static const struct acpi_dlevel acpi_debug_levels[] = {
ACPI_DEBUG_INIT(ACPI_LV_INIT),
ACPI_DEBUG_INIT(ACPI_LV_DEBUG_OBJECT),
ACPI_DEBUG_INIT(ACPI_LV_INFO),
+ ACPI_DEBUG_INIT(ACPI_LV_REPAIR),
+ ACPI_DEBUG_INIT(ACPI_LV_TRACE_POINT),
ACPI_DEBUG_INIT(ACPI_LV_INIT_NAMES),
ACPI_DEBUG_INIT(ACPI_LV_PARSE),
@@ -162,55 +164,116 @@ static const struct kernel_param_ops param_ops_debug_level = {
module_param_cb(debug_layer, &param_ops_debug_layer, &acpi_dbg_layer, 0644);
module_param_cb(debug_level, &param_ops_debug_level, &acpi_dbg_level, 0644);
-static char trace_method_name[6];
-module_param_string(trace_method_name, trace_method_name, 6, 0644);
-static unsigned int trace_debug_layer;
-module_param(trace_debug_layer, uint, 0644);
-static unsigned int trace_debug_level;
-module_param(trace_debug_level, uint, 0644);
+static char trace_method_name[1024];
-static int param_set_trace_state(const char *val, struct kernel_param *kp)
+int param_set_trace_method_name(const char *val, const struct kernel_param *kp)
{
- int result = 0;
+ u32 saved_flags = 0;
+ bool is_abs_path = true;
- if (!strncmp(val, "enable", sizeof("enable") - 1)) {
- result = acpi_debug_trace(trace_method_name, trace_debug_level,
- trace_debug_layer, 0);
- if (result)
- result = -EBUSY;
- goto exit;
- }
+ if (*val != '\\')
+ is_abs_path = false;
- if (!strncmp(val, "disable", sizeof("disable") - 1)) {
- int name = 0;
- result = acpi_debug_trace((char *)&name, trace_debug_level,
- trace_debug_layer, 0);
- if (result)
- result = -EBUSY;
- goto exit;
+ if ((is_abs_path && strlen(val) > 1023) ||
+ (!is_abs_path && strlen(val) > 1022)) {
+ pr_err("%s: string parameter too long\n", kp->name);
+ return -ENOSPC;
}
- if (!strncmp(val, "1", 1)) {
- result = acpi_debug_trace(trace_method_name, trace_debug_level,
- trace_debug_layer, 1);
- if (result)
- result = -EBUSY;
- goto exit;
+ /*
+ * It's not safe to update acpi_gbl_trace_method_name without
+ * having the tracer stopped, so we save the original tracer
+ * state and disable it.
+ */
+ saved_flags = acpi_gbl_trace_flags;
+ (void)acpi_debug_trace(NULL,
+ acpi_gbl_trace_dbg_level,
+ acpi_gbl_trace_dbg_layer,
+ 0);
+
+ /* This is a hack. We can't kmalloc in early boot. */
+ if (is_abs_path)
+ strcpy(trace_method_name, val);
+ else {
+ trace_method_name[0] = '\\';
+ strcpy(trace_method_name+1, val);
}
- result = -EINVAL;
-exit:
- return result;
+ /* Restore the original tracer state */
+ (void)acpi_debug_trace(trace_method_name,
+ acpi_gbl_trace_dbg_level,
+ acpi_gbl_trace_dbg_layer,
+ saved_flags);
+
+ return 0;
+}
+
+static int param_get_trace_method_name(char *buffer, const struct kernel_param *kp)
+{
+ return scnprintf(buffer, PAGE_SIZE, "%s", acpi_gbl_trace_method_name);
+}
+
+static const struct kernel_param_ops param_ops_trace_method = {
+ .set = param_set_trace_method_name,
+ .get = param_get_trace_method_name,
+};
+
+static const struct kernel_param_ops param_ops_trace_attrib = {
+ .set = param_set_uint,
+ .get = param_get_uint,
+};
+
+module_param_cb(trace_method_name, &param_ops_trace_method, &trace_method_name, 0644);
+module_param_cb(trace_debug_layer, &param_ops_trace_attrib, &acpi_gbl_trace_dbg_layer, 0644);
+module_param_cb(trace_debug_level, &param_ops_trace_attrib, &acpi_gbl_trace_dbg_level, 0644);
+
+static int param_set_trace_state(const char *val, struct kernel_param *kp)
+{
+ acpi_status status;
+ const char *method = trace_method_name;
+ u32 flags = 0;
+
+/* So "xxx-once" comparison should go prior than "xxx" comparison */
+#define acpi_compare_param(val, key) \
+ strncmp((val), (key), sizeof(key) - 1)
+
+ if (!acpi_compare_param(val, "enable")) {
+ method = NULL;
+ flags = ACPI_TRACE_ENABLED;
+ } else if (!acpi_compare_param(val, "disable"))
+ method = NULL;
+ else if (!acpi_compare_param(val, "method-once"))
+ flags = ACPI_TRACE_ENABLED | ACPI_TRACE_ONESHOT;
+ else if (!acpi_compare_param(val, "method"))
+ flags = ACPI_TRACE_ENABLED;
+ else if (!acpi_compare_param(val, "opcode-once"))
+ flags = ACPI_TRACE_ENABLED | ACPI_TRACE_ONESHOT | ACPI_TRACE_OPCODE;
+ else if (!acpi_compare_param(val, "opcode"))
+ flags = ACPI_TRACE_ENABLED | ACPI_TRACE_OPCODE;
+ else
+ return -EINVAL;
+
+ status = acpi_debug_trace(method,
+ acpi_gbl_trace_dbg_level,
+ acpi_gbl_trace_dbg_layer,
+ flags);
+ if (ACPI_FAILURE(status))
+ return -EBUSY;
+
+ return 0;
}
static int param_get_trace_state(char *buffer, struct kernel_param *kp)
{
- if (!acpi_gbl_trace_method_name)
+ if (!(acpi_gbl_trace_flags & ACPI_TRACE_ENABLED))
return sprintf(buffer, "disable");
else {
- if (acpi_gbl_trace_flags & 1)
- return sprintf(buffer, "1");
- else
+ if (acpi_gbl_trace_method_name) {
+ if (acpi_gbl_trace_flags & ACPI_TRACE_ONESHOT)
+ return sprintf(buffer, "method-once");
+ else
+ return sprintf(buffer, "method");
+ } else
return sprintf(buffer, "enable");
}
return 0;