linux-kernel - Re: [PATCH v2] ACPI: Add CPU hotplug support for processor device objects

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Date:	Fri, 30 Mar 2012 08:14:54 -0600
From:	Toshi Kani <toshi.kani@...com>
To:	Len Brown <lenb@...nel.org>
Cc:	linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
	bhelgaas@...gle.com
Subject: Re: [PATCH v2] ACPI: Add CPU hotplug support for processor device
 objects

On Fri, 2012-03-30 at 03:05 -0400, Len Brown wrote:
> Tested on what?

Hi Len,

The change was tested on HP internal prototype that implements processor
device objects.

Thanks,
-Toshi


> thanks,
> -Len
> 
> On 03/20/2012 07:58 PM, Toshi Kani wrote:
> 
> > acpi_processor_install_hotplug_notify() registers processor objects to
> > receive ACPI CPU hotplug event notifications. This patch additionally
> > registers processor device objects (ACPI0007) to receive the notifications
> > as well.
> > 
> > v2: Changed is_processor_device() to a boolean func.
> > 
> > Signed-off-by: Toshi Kani <toshi.kani@...com>
> > Reviewed-by: Bjorn Helgaas <bhelgaas@...gle.com>
> > ---
> >  drivers/acpi/processor_driver.c |   54 ++++++++++++++++++++++++++++++--------
> >  1 files changed, 42 insertions(+), 12 deletions(-)
> > 
> > diff --git a/drivers/acpi/processor_driver.c b/drivers/acpi/processor_driver.c
> > index 8ae05ce..71bdaf1 100644
> > --- a/drivers/acpi/processor_driver.c
> > +++ b/drivers/acpi/processor_driver.c
> > @@ -68,6 +68,7 @@
> >  #define ACPI_PROCESSOR_NOTIFY_PERFORMANCE 0x80
> >  #define ACPI_PROCESSOR_NOTIFY_POWER	0x81
> >  #define ACPI_PROCESSOR_NOTIFY_THROTTLING	0x82
> > +#define ACPI_PROCESSOR_DEVICE_HID	"ACPI0007"
> >  
> >  #define ACPI_PROCESSOR_LIMIT_USER	0
> >  #define ACPI_PROCESSOR_LIMIT_THERMAL	1
> > @@ -88,7 +89,7 @@ static int acpi_processor_start(struct acpi_processor *pr);
> >  
> >  static const struct acpi_device_id processor_device_ids[] = {
> >  	{ACPI_PROCESSOR_OBJECT_HID, 0},
> > -	{"ACPI0007", 0},
> > +	{ACPI_PROCESSOR_DEVICE_HID, 0},
> >  	{"", 0},
> >  };
> >  MODULE_DEVICE_TABLE(acpi, processor_device_ids);
> > @@ -741,20 +742,48 @@ static void acpi_processor_hotplug_notify(acpi_handle handle,
> >  	return;
> >  }
> >  
> > +static bool is_processor_device(acpi_handle handle)
> > +{
> > +	struct acpi_device_info *info;
> > +	char *hid;
> > +	acpi_status status;
> > +	bool is_proc;
> > +
> > +	status = acpi_get_object_info(handle, &info);
> > +	if (ACPI_FAILURE(status))
> > +		return false;
> > +
> > +	if (info->type == ACPI_TYPE_PROCESSOR) {
> > +		is_proc = true;	/* found a processor object */
> > +		goto cleanup;
> > +	}
> > +
> > +	if (!(info->valid & ACPI_VALID_HID)) {
> > +		is_proc = false;
> > +		goto cleanup;
> > +	}
> > +
> > +	hid = info->hardware_id.string;
> > +	if ((hid == NULL) || strcmp(hid, ACPI_PROCESSOR_DEVICE_HID)) {
> > +		is_proc = false;
> > +		goto cleanup;
> > +	}
> > +
> > +	is_proc = true;		/* found a processor device object */
> > +
> > +cleanup:
> > +	kfree(info);
> > +	return is_proc;
> > +}
> > +
> >  static acpi_status
> >  processor_walk_namespace_cb(acpi_handle handle,
> >  			    u32 lvl, void *context, void **rv)
> >  {
> > -	acpi_status status;
> >  	int *action = context;
> > -	acpi_object_type type = 0;
> > -
> > -	status = acpi_get_type(handle, &type);
> > -	if (ACPI_FAILURE(status))
> > -		return (AE_OK);
> >  
> > -	if (type != ACPI_TYPE_PROCESSOR)
> > -		return (AE_OK);
> > +	if (!is_processor_device(handle))
> > +		return AE_OK;	/* not a processor; continue to walk */
> >  
> >  	switch (*action) {
> >  	case INSTALL_NOTIFY_HANDLER:
> > @@ -772,7 +801,8 @@ processor_walk_namespace_cb(acpi_handle handle,
> >  		break;
> >  	}
> >  
> > -	return (AE_OK);
> > +	/* found a processor; skip walking underneath */
> > +	return AE_CTRL_DEPTH;
> >  }
> >  
> >  static acpi_status acpi_processor_hotadd_init(struct acpi_processor *pr)
> > @@ -830,7 +860,7 @@ void acpi_processor_install_hotplug_notify(void)
> >  {
> >  #ifdef CONFIG_ACPI_HOTPLUG_CPU
> >  	int action = INSTALL_NOTIFY_HANDLER;
> > -	acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
> > +	acpi_walk_namespace(ACPI_TYPE_ANY,
> >  			    ACPI_ROOT_OBJECT,
> >  			    ACPI_UINT32_MAX,
> >  			    processor_walk_namespace_cb, NULL, &action, NULL);
> > @@ -843,7 +873,7 @@ void acpi_processor_uninstall_hotplug_notify(void)
> >  {
> >  #ifdef CONFIG_ACPI_HOTPLUG_CPU
> >  	int action = UNINSTALL_NOTIFY_HANDLER;
> > -	acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
> > +	acpi_walk_namespace(ACPI_TYPE_ANY,
> >  			    ACPI_ROOT_OBJECT,
> >  			    ACPI_UINT32_MAX,
> >  			    processor_walk_namespace_cb, NULL, &action, NULL);
> 
> 


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