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Message-Id: <201009170756.53100.bjorn.helgaas@hp.com>
Date: Fri, 17 Sep 2010 07:56:52 -0600
From: Bjorn Helgaas <bjorn.helgaas@...com>
To: Yinghai Lu <yinghai@...nel.org>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
"Brown, Len" <len.brown@...el.com>,
Suresh Siddha <suresh.b.siddha@...el.com>,
ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>,
Thomas Gleixner <tglx@...utronix.de>,
Lin Ming <ming.m.lin@...el.com>,
Bob Moore <robert.moore@...el.com>
Subject: Re: [PATCH] acpi: handle ACPI0007 Device in acpi_early_set_pdc
On Friday, September 17, 2010 01:21:56 am Yinghai Lu wrote:
> 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.
I think you missed this line in my previous response:
> > But I do see your point, and having seen the patch
> > below, I prefer the original one-line version.
The patch below is better, because it doesn't reimplement quite
so much stuff, but it still changes the CA, and I think the end
result is still quite confusing to read.
So I still prefer the original one-line version.
Bjorn
> [PATCH -v3] acpi: Handle ACPI0007 Device in acpi_early_set_pdc
>
> After
> | commit d8191fa4a33fdc817277da4f2b7f771ff605a41c
> | Author: Alex Chiang <achiang@...com>
> | 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@...nel.org>
>
> ---
> 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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