linux-kernel - Re: [PATCH] powercap/rapl: add support for ValleyView Soc

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Date:	Sun, 22 Dec 2013 02:06:33 +0100
From:	"Rafael J. Wysocki" <rjw@...ysocki.net>
To:	Jacob Pan <jacob.jun.pan@...ux.intel.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Linux PM <linux-pm@...r.kernel.org>,
	Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
	Rafael Wysocki <rafael.j.wysocki@...el.com>,
	Gavin Hindman <gavin.hindman@...el.com>,
	"Triplett, Josh" <josh.triplett@...el.com>
Subject: Re: [PATCH] powercap/rapl: add support for ValleyView Soc

On Wednesday, December 11, 2013 02:39:27 PM Jacob Pan wrote:
> This patch adds support for RAPL on Intel ValleyView based SoC
> platforms, such as Baytrail.
> 
> Besides adding CPU ID, special energy unit encoding is handled
> for ValleyView.
> 
> Signed-off-by: Jacob Pan <jacob.jun.pan@...ux.intel.com>

Queued up for 3.14, thanks!

> ---
>  drivers/powercap/intel_rapl.c | 13 +++++++++++--
>  1 file changed, 11 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/powercap/intel_rapl.c b/drivers/powercap/intel_rapl.c
> index 2a786c5..3c67683 100644
> --- a/drivers/powercap/intel_rapl.c
> +++ b/drivers/powercap/intel_rapl.c
> @@ -833,6 +833,11 @@ static int rapl_write_data_raw(struct rapl_domain *rd,
>  	return 0;
>  }
>  
> +static const struct x86_cpu_id energy_unit_quirk_ids[] = {
> +	{ X86_VENDOR_INTEL, 6, 0x37},/* VLV */
> +	{}
> +};
> +
>  static int rapl_check_unit(struct rapl_package *rp, int cpu)
>  {
>  	u64 msr_val;
> @@ -853,8 +858,11 @@ static int rapl_check_unit(struct rapl_package *rp, int cpu)
>  	 * time unit: 1/time_unit_divisor Seconds
>  	 */
>  	value = (msr_val & ENERGY_UNIT_MASK) >> ENERGY_UNIT_OFFSET;
> -	rp->energy_unit_divisor = 1 << value;
> -
> +	/* some CPUs have different way to calculate energy unit */
> +	if (x86_match_cpu(energy_unit_quirk_ids))
> +		rp->energy_unit_divisor = 1000000 / (1 << value);
> +	else
> +		rp->energy_unit_divisor = 1 << value;
>  
>  	value = (msr_val & POWER_UNIT_MASK) >> POWER_UNIT_OFFSET;
>  	rp->power_unit_divisor = 1 << value;
> @@ -941,6 +949,7 @@ static void package_power_limit_irq_restore(int package_id)
>  static const struct x86_cpu_id rapl_ids[] = {
>  	{ X86_VENDOR_INTEL, 6, 0x2a},/* SNB */
>  	{ X86_VENDOR_INTEL, 6, 0x2d},/* SNB EP */
> +	{ X86_VENDOR_INTEL, 6, 0x37},/* VLV */
>  	{ X86_VENDOR_INTEL, 6, 0x3a},/* IVB */
>  	{ X86_VENDOR_INTEL, 6, 0x45},/* HSW */
>  	/* TODO: Add more CPU IDs after testing */
> 
-- 
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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