linux-kernel - Re: [RFC v02 5/5] Introduce Intel RAPL power capping driver

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Message-ID: <1375892797.2424.126.camel@joe-AO722>
Date:	Wed, 07 Aug 2013 09:26:37 -0700
From:	Joe Perches <joe@...ches.com>
To:	Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
Cc:	linux-kernel@...r.kernel.org, gregkh@...uxfoundation.org,
	rjw@...k.pl, arjan@...ux.intel.com, len.brown@...el.com,
	jacob.jun.pan@...ux.intel.com, corbet@....net
Subject: Re: [RFC v02 5/5] Introduce Intel RAPL power capping driver

On Wed, 2013-08-07 at 09:12 -0700, Srinivas Pandruvada wrote:
> RAPL(Running Average Power Limit) interface provides platform software
> with the ability to monitor, control, and get notifications on SOC
> power consumptions.

trivial notes:

> diff --git a/drivers/powercap/intel_rapl.c b/drivers/powercap/intel_rapl.c
[]
> +#define POWER_LIMIT1_MASK       0x7FFF
> +#define POWER_LIMIT1_ENABLE     BIT(15)
> +#define POWER_LIMIT1_CLAMP      BIT(16)
> +
> +#define POWER_LIMIT2_MASK       (0x7FFFULL<<32)
> +#define POWER_LIMIT2_ENABLE     (0x1ULL<<47)
> +#define POWER_LIMIT2_CLAMP      (0x1ULL<<48)
> +#define POWER_PKG_LOCK          (0x1ULL<<63)

Maybe it's time add a generic bitops.h macro

#define BIT_ULL(nr)	(1ULL << (nr))

[]

> +/* called after domain detection and package level data are set */
> +static void rapl_init_domains(struct rapl_pkg *rp)
> +{
> +	int i;
> +	struct rapl_domain *rd = rp->domains;
> +
> +	for (i = 0; i < RAPL_DOMAIN_MAX; i++) {
> +		unsigned int mask = rp->domain_map & (1 << i);
> +		switch (mask) {
> +		case 1 << RAPL_DOMAIN_PKG:

Maybe use defines or BIT(RAPL_DOMAIN_PKG)

Other than that the code seems to read pretty easily.

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