linux-kernel - Re: [PATCH 1/2 V6] intel_pstate: skip this driver if Sun server has

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Date:	Tue, 2 Dec 2014 10:22:31 -0800
From:	Kristen Carlson Accardi <kristen@...ux.intel.com>
To:	Ethan Zhao <ethan.zhao@...cle.com>
Cc:	<dirk.j.brandewie@...el.com>, <linda.knippers@...com>,
	<viresh.kumar@...aro.org>, <rjw@...ysocki.net>, <corbet@....net>,
	<linux-doc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-pm@...r.kernel.org>, <ethan.kernel@...il.com>,
	Dirk Brandewie <dirk.brandewie@...il.com>
Subject: Re: [PATCH 1/2 V6] intel_pstate: skip this driver if Sun server has
 _PPC method

On Mon, 1 Dec 2014 11:32:08 +0900
Ethan Zhao <ethan.zhao@...cle.com> wrote:

> Oracle Sun X86 servers have dynamic power capping capability that works via
> ACPI _PPC method etc, so skip loading this driver if Sun server has ACPI _PPC
> enabled.
> 
> Signed-off-by: Ethan Zhao <ethan.zhao@...cle.com>
> Signed-off-by: Dirk Brandewie <dirk.brandewie@...il.com>
> Tested-by: Linda Knippers <linda.knippers@...com>

Acked-by: Kristen Carlson Accardi <kristen@...ux.intel.com>

> ---
>   v2: fix break HP Proliant issue.
>   v3: expand the hardware vendor list.
>   v4: refine code.
>   v5v6: change enum PCC to PPC.
> 
>  drivers/cpufreq/intel_pstate.c | 45 ++++++++++++++++++++++++++++++++++++++----
>  1 file changed, 41 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c
> index 27bb6d3..1bb62ca 100644
> --- a/drivers/cpufreq/intel_pstate.c
> +++ b/drivers/cpufreq/intel_pstate.c
> @@ -943,15 +943,46 @@ static bool intel_pstate_no_acpi_pss(void)
>  	return true;
>  }
>  
> +static bool intel_pstate_has_acpi_ppc(void)
> +{
> +	int i;
> +
> +	for_each_possible_cpu(i) {
> +		struct acpi_processor *pr = per_cpu(processors, i);
> +
> +		if (!pr)
> +			continue;
> +		if (acpi_has_method(pr->handle, "_PPC"))
> +			return true;
> +	}
> +	return false;
> +}
> +
> +enum {
> +	PSS,
> +	PPC,
> +};
> +
>  struct hw_vendor_info {
>  	u16  valid;
>  	char oem_id[ACPI_OEM_ID_SIZE];
>  	char oem_table_id[ACPI_OEM_TABLE_ID_SIZE];
> +	int  oem_pwr_table;
>  };
>  
>  /* Hardware vendor-specific info that has its own power management modes */
>  static struct hw_vendor_info vendor_info[] = {
> -	{1, "HP    ", "ProLiant"},
> +	{1, "HP    ", "ProLiant", PSS},
> +	{1, "ORACLE", "X4-2    ", PPC},
> +	{1, "ORACLE", "X4-2L   ", PPC},
> +	{1, "ORACLE", "X4-2B   ", PPC},
> +	{1, "ORACLE", "X3-2    ", PPC},
> +	{1, "ORACLE", "X3-2L   ", PPC},
> +	{1, "ORACLE", "X3-2B   ", PPC},
> +	{1, "ORACLE", "X4470M2 ", PPC},
> +	{1, "ORACLE", "X4270M3 ", PPC},
> +	{1, "ORACLE", "X4270M2 ", PPC},
> +	{1, "ORACLE", "X4170M2 ", PPC},
>  	{0, "", ""},
>  };
>  
> @@ -966,15 +997,21 @@ static bool intel_pstate_platform_pwr_mgmt_exists(void)
>  
>  	for (v_info = vendor_info; v_info->valid; v_info++) {
>  		if (!strncmp(hdr.oem_id, v_info->oem_id, ACPI_OEM_ID_SIZE) &&
> -		    !strncmp(hdr.oem_table_id, v_info->oem_table_id, ACPI_OEM_TABLE_ID_SIZE) &&
> -		    intel_pstate_no_acpi_pss())
> -			return true;
> +			!strncmp(hdr.oem_table_id, v_info->oem_table_id,
> +						ACPI_OEM_TABLE_ID_SIZE))
> +			switch (v_info->oem_pwr_table) {
> +			case PSS:
> +				return intel_pstate_no_acpi_pss();
> +			case PPC:
> +				return intel_pstate_has_acpi_ppc();
> +			}
>  	}
>  
>  	return false;
>  }
>  #else /* CONFIG_ACPI not enabled */
>  static inline bool intel_pstate_platform_pwr_mgmt_exists(void) { return false; }
> +static inline bool intel_pstate_has_acpi_ppc(void) { return false; }
>  #endif /* CONFIG_ACPI */
>  
>  static int __init intel_pstate_init(void)

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