On 09/13/2010 10:28 AM, Bjorn Helgaas wrote:
> On Friday, September 10, 2010 08:06:26 pm Yinghai Lu wrote:
>
> I timed the original on a 64-CPU box where the namespace walk cost
> should be relatively high, and the walk you added takes about 0.01
> seconds. The one already there took about 0.03 seconds, so neither
> costs very much.
>
> And I don't like the fact that the patch below changes the ACPI CA
> and it only partly implements acpi_get_devices(), since it ignores
> _CID and _STA.
please check this one. it still keep _STA etc.
[PATCH -v3] acpi: Handle ACPI0007 Device in acpi_early_set_pdc
After
| commit d8191fa4a33fdc817277da4f2b7f771ff605a41c
| Author: Alex Chiang <achiang@xxxxxx>
| Date: Mon Feb 22 12:11:39 2010 -0700
|
| ACPI: processor: driver doesn't need to evaluate _PDC
|
| Now that the early _PDC evaluation path knows how to correctly
| evaluate _PDC on only physically present processors, there's no
| need for the processor driver to evaluate it later when it loads.
|
| To cover the hotplug case, push _PDC evaluation down into the
| hotplug paths.
only cpu with Processor Statement get processed with _PDC
If bios is using Device object instead of Processor statement.
SSDTs for Pstate/Cstate/Tstate can not be loaded dynamically.
Need to try to scan ACPI0007 in addition to Processor.
That commit is between 2.6.34-rc1 and 2.6.34-rc2, so stable tree for 2.6.34+
need this patch.
-v2: add 47 lines instead of 1 line to walk namespace one time only.
-v3: Let acpi_match_device_hid() call acpi_ns_get_device_callback()
Signed-off-by: Yinghai Lu <yinghai@xxxxxxxxxx>
---
drivers/acpi/acpica/nsxfeval.c | 41 +++++++++++++++++++++++++++++++++++++++++
drivers/acpi/processor_core.c | 8 +++++---
include/acpi/acpixf.h | 2 ++
3 files changed, 48 insertions(+), 3 deletions(-)
Index: linux-2.6/drivers/acpi/processor_core.c
===================================================================
--- linux-2.6.orig/drivers/acpi/processor_core.c
+++ linux-2.6/drivers/acpi/processor_core.c
@@ -189,7 +189,7 @@ int acpi_get_cpuid(acpi_handle handle, i
EXPORT_SYMBOL_GPL(acpi_get_cpuid);
#endif
-static bool processor_physically_present(acpi_handle handle)
+static bool is_processor_and_physically_present(acpi_handle handle)
{
int cpuid, type;
u32 acpi_id;
@@ -211,6 +211,8 @@ static bool processor_physically_present
acpi_id = object.processor.proc_id;
break;
case ACPI_TYPE_DEVICE:
+ if (acpi_match_device_hid(handle, "ACPI0007") != AE_OK)
+ return false;
status = acpi_evaluate_integer(handle, "_UID", NULL, &tmp);
if (ACPI_FAILURE(status))
return false;
@@ -334,7 +336,7 @@ EXPORT_SYMBOL_GPL(acpi_processor_set_pdc
static acpi_status
early_init_pdc(acpi_handle handle, u32 lvl, void *context, void **rv)
{
- if (processor_physically_present(handle) == false)
+ if (is_processor_and_physically_present(handle) == false)
return AE_OK;
acpi_processor_set_pdc(handle);
@@ -349,7 +351,7 @@ void __init acpi_early_processor_set_pdc
*/
dmi_check_system(processor_idle_dmi_table);
- acpi_walk_namespace(ACPI_TYPE_PROCESSOR, ACPI_ROOT_OBJECT,
+ acpi_walk_namespace(ACPI_TYPE_ANY, ACPI_ROOT_OBJECT,
ACPI_UINT32_MAX,
early_init_pdc, NULL, NULL, NULL);
}
Index: linux-2.6/drivers/acpi/acpica/nsxfeval.c
===================================================================
--- linux-2.6.orig/drivers/acpi/acpica/nsxfeval.c
+++ linux-2.6/drivers/acpi/acpica/nsxfeval.c
@@ -642,6 +642,47 @@ acpi_ns_get_device_callback(acpi_handle
return (status);
}
+static acpi_status
+acpi_match_device_hid_callback(acpi_handle obj_handle,
+ u32 nesting_level,
+ void *context, void **return_value)
+{
+ *return_value = (void *)0xff;
+
+ return AE_OK;
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_match_device_hid
+ *
+ * PARAMETERS: handle and HID to be compared
+ *
+ * RETURN: AE_OK mean found match one
+ *
+ * DESCRIPTION: check if device coresponding to handle has HID
+ *
+ ******************************************************************************/
+acpi_status acpi_match_device_hid(acpi_handle obj_handle, const char *HID)
+{
+ struct acpi_get_devices_info info;
+ void *return_value = NULL;
+
+ ACPI_FUNCTION_TRACE(acpi_match_device_hid);
+
+ info.hid = HID;
+ info.context = NULL;
+ info.user_function = acpi_match_device_hid_callback;
+
+ acpi_ns_get_device_callback(obj_handle, ACPI_UINT32_MAX,
+ &info, &return_value);
+
+ if (!return_value)
+ return AE_NOT_FOUND;
+
+ return AE_OK;
+}
+
/*******************************************************************************
*
* FUNCTION: acpi_get_devices
Index: linux-2.6/include/acpi/acpixf.h
===================================================================
--- linux-2.6.orig/include/acpi/acpixf.h
+++ linux-2.6/include/acpi/acpixf.h
@@ -160,6 +160,8 @@ acpi_walk_namespace(acpi_object_type typ
acpi_walk_callback post_order_visit,
void *context, void **return_value);
+acpi_status acpi_match_device_hid(acpi_handle obj_handle, const char *HID);
+
acpi_status
acpi_get_devices(const char *HID,
acpi_walk_callback user_function,
--
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