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SubjectRe: [PATCH 2/3] introduce intel_rapl driver
On Thu, 26 May 2011 16:34:17 +0800 Zhang Rui wrote:

>
> Introduce Intel RAPL driver.
>
> RAPL (running average power limit) is a new feature which provides mechanisms
> to enforce power consumption limit, on some new processors.
>
> RAPL provides MSRs reporting the total amount of energy consumed
> by the package/core/uncore/dram.
> Further more, by using RAPL, OS can set a power bugdet in a certain time window,
> and let Hardware to throttle the processor P/T-state to meet this enery limitation.
>
> Currently, we don't have the plan to support the RAPL power control,
> but we do want to export the package/core/uncore/dram power consumption
> information via perf tool first.

Hi,

What's an uncore?

> Signed-off-by: Zhang Rui <rui.zhang@intel.com>
> ---
> drivers/platform/x86/Kconfig | 8
> drivers/platform/x86/Makefile | 1
> drivers/platform/x86/intel_rapl.c | 368 ++++++++++++++++++++++++++++++++++++++
> include/linux/perf_event.h | 4
> 4 files changed, 381 insertions(+)
>
> Index: linux-2.6/drivers/platform/x86/Kconfig
> ===================================================================
> --- linux-2.6.orig/drivers/platform/x86/Kconfig
> +++ linux-2.6/drivers/platform/x86/Kconfig
> @@ -753,4 +753,12 @@ config SAMSUNG_LAPTOP
> To compile this driver as a module, choose M here: the module
> will be called samsung-laptop.
>
> +config INTEL_RAPL
> + tristate "Intel RAPL Support"
> + depends on X86
> + default y
> + ---help---
> + RAPL, AKA, Running Average Power Limit provides mechanisms to enforce

RAPL (Running Average Power Limit) provides mechanisms to enforce

> + power consumption limit.
> +
> endif # X86_PLATFORM_DEVICES

> Index: linux-2.6/drivers/platform/x86/intel_rapl.c
> ===================================================================
> --- /dev/null
> +++ linux-2.6/drivers/platform/x86/intel_rapl.c
> @@ -0,0 +1,368 @@

[snip]

> +/* show the energy status, in Jelous */

Is that Joules? or what?

> +static int rapl_read_energy(struct rapl_domain *domain)
> +{
> + u64 value;
> + u32 msr = domain->msrs.status;
> +
> + rdmsrl(msr, value);
> + return rapl_unit_xlate(ENERGY_UNIT, value, 0);
> +}

[snip]

> +static int __init intel_rapl_init(void)
> +{
> + enum rapl_domain_id id;
> +
> + /*
> + * RAPL features are only supported on processors have a CPUID
> + * signature with DisplayFamily_DisplayModel of 06_2AH, 06_2DH
> + */
> + if (boot_cpu_data.x86 != 0x06)
> + return -ENODEV;
> +
> + if (boot_cpu_data.x86_model == 0x2A)
> + rapl_domains[RAPL_DOMAIN_PP1].valid = 1;
> + else if (boot_cpu_data.x86_model == 0x2D)
> + rapl_domains[RAPL_DOMAIN_DRAM].valid = 1;
> + else
> + return -ENODEV;
> +
> + if (rapl_check_unit())
> + return -ENODEV;
> +
> + for(id = 0; id < RAPL_DOMAIN_MAX; id++)

space after "for"

> + if (rapl_domains[id].valid)
> + perf_pmu_register(&(rapl_domains[id].pmu), rapl_domains[id].pmu.name, PERF_TYPE_SOFTWARE);
> + return 0;
> +}
> +
> +static void __exit intel_rapl_exit(void)
> +{
> + enum rapl_domain_id id;
> +
> + for(id = 0; id < RAPL_DOMAIN_MAX; id++)

ditto

> + if (rapl_domains[id].valid)
> + perf_pmu_unregister(&(rapl_domains[id].pmu));
> +}


---
~Randy
*** Remember to use Documentation/SubmitChecklist when testing your code ***


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