summaryrefslogtreecommitdiff
path: root/drivers/acpi/osl.c
diff options
context:
space:
mode:
authorLv Zheng <lv.zheng@intel.com>2015-08-05 11:23:51 +0300
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2015-08-07 03:42:21 +0300
commit7901a052a981691d18f4e8f91fc27e40849b7336 (patch)
tree2d2adcd79d8a13bcafc420105918459236c223a0 /drivers/acpi/osl.c
parent93d988310bb2f5ed16ba075bbc4281aa06907e72 (diff)
downloadlinux-7901a052a981691d18f4e8f91fc27e40849b7336.tar.xz
ACPI / sysfs: Update method tracing facility.
This patch updates the method tracing facility as the acpi_debug_trace() API has been updated to allow it to trace AML interpreter execution, the meanings and the usages of the API parameters are changed due to the updates. The new API: 1. Uses ACPI_TRACE_ENABLED flag to indicate the enabling of the tracer; 2. Allows tracer still can be enabled when method name is not specified so that the AML interpreter execution can be traced without knowing the method name, which is useful for kernel boot tracing; 3. Supports arbitrary full path name, it doesn't need to be a name related to an entrance of acpi_evaluate_object(). Note that the sysfs parameters are also updated so that when reading the attribute files, ACPICA internal settings are returned. In order to make the sysfs parameters (acpi.trace_state) available during boot, this patch adds code to bypass ACPICA semaphore/mutex invocations when acpi mutex utilities haven't been initialized. This patch doesn't update documentation of method tracing facility, it will be updated by further patches. Signed-off-by: Lv Zheng <lv.zheng@intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/acpi/osl.c')
-rw-r--r--drivers/acpi/osl.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c
index 3b8963f21b36..6341cb523dc4 100644
--- a/drivers/acpi/osl.c
+++ b/drivers/acpi/osl.c
@@ -83,6 +83,7 @@ static void *acpi_irq_context;
static struct workqueue_struct *kacpid_wq;
static struct workqueue_struct *kacpi_notify_wq;
static struct workqueue_struct *kacpi_hotplug_wq;
+static bool acpi_os_initialized;
/*
* This list of permanent mappings is for memory that may be accessed from
@@ -1316,6 +1317,9 @@ acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout)
long jiffies;
int ret = 0;
+ if (!acpi_os_initialized)
+ return AE_OK;
+
if (!sem || (units < 1))
return AE_BAD_PARAMETER;
@@ -1355,6 +1359,9 @@ acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units)
{
struct semaphore *sem = (struct semaphore *)handle;
+ if (!acpi_os_initialized)
+ return AE_OK;
+
if (!sem || (units < 1))
return AE_BAD_PARAMETER;
@@ -1863,6 +1870,7 @@ acpi_status __init acpi_os_initialize(void)
rv = acpi_os_map_generic_address(&acpi_gbl_FADT.reset_register);
pr_debug(PREFIX "%s: map reset_reg status %d\n", __func__, rv);
}
+ acpi_os_initialized = true;
return AE_OK;
}