linux-kernel - Re: [PATCH v1 2/5] perf/x86/intel/pt: IP filtering register/cpuid bits

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Message-ID: <20160421174813.GA29639@pd.tnic>
Date:	Thu, 21 Apr 2016 19:48:13 +0200
From:	Borislav Petkov <bp@...en8.de>
To:	Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org,
	vince@...ter.net, eranian@...gle.com,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Mathieu Poirier <mathieu.poirier@...aro.org>
Subject: Re: [PATCH v1 2/5] perf/x86/intel/pt: IP filtering register/cpuid
 bits

On Thu, Apr 21, 2016 at 06:17:00PM +0300, Alexander Shishkin wrote:
> New versions of Intel PT support address range-based filtering. These
> are the registers, bit definitions and relevant CPUID bits.
> 
> Signed-off-by: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
> ---
>  arch/x86/events/intel/pt.c       |  2 ++
>  arch/x86/events/intel/pt.h       |  2 ++
>  arch/x86/include/asm/msr-index.h | 18 ++++++++++++++++++
>  3 files changed, 22 insertions(+)
> 
> diff --git a/arch/x86/events/intel/pt.c b/arch/x86/events/intel/pt.c
> index 127f58c179..891447dd61 100644
> --- a/arch/x86/events/intel/pt.c
> +++ b/arch/x86/events/intel/pt.c
> @@ -67,11 +67,13 @@ static struct pt_cap_desc {
>  	PT_CAP(max_subleaf,		0, CR_EAX, 0xffffffff),
>  	PT_CAP(cr3_filtering,		0, CR_EBX, BIT(0)),
>  	PT_CAP(psb_cyc,			0, CR_EBX, BIT(1)),
> +	PT_CAP(ip_filtering,		0, CR_EBX, BIT(2)),
>  	PT_CAP(mtc,			0, CR_EBX, BIT(3)),
>  	PT_CAP(topa_output,		0, CR_ECX, BIT(0)),
>  	PT_CAP(topa_multiple_entries,	0, CR_ECX, BIT(1)),
>  	PT_CAP(single_range_output,	0, CR_ECX, BIT(2)),
>  	PT_CAP(payloads_lip,		0, CR_ECX, BIT(31)),
> +	PT_CAP(num_address_ranges,	1, CR_EAX, 0x3),
>  	PT_CAP(mtc_periods,		1, CR_EAX, 0xffff0000),
>  	PT_CAP(cycle_thresholds,	1, CR_EBX, 0xffff),
>  	PT_CAP(psb_periods,		1, CR_EBX, 0xffff0000),
> diff --git a/arch/x86/events/intel/pt.h b/arch/x86/events/intel/pt.h
> index 336878a5d2..6ce8cd20b9 100644
> --- a/arch/x86/events/intel/pt.h
> +++ b/arch/x86/events/intel/pt.h
> @@ -52,11 +52,13 @@ enum pt_capabilities {
>  	PT_CAP_max_subleaf = 0,
>  	PT_CAP_cr3_filtering,
>  	PT_CAP_psb_cyc,
> +	PT_CAP_ip_filtering,
>  	PT_CAP_mtc,
>  	PT_CAP_topa_output,
>  	PT_CAP_topa_multiple_entries,
>  	PT_CAP_single_range_output,
>  	PT_CAP_payloads_lip,
> +	PT_CAP_num_address_ranges,
>  	PT_CAP_mtc_periods,
>  	PT_CAP_cycle_thresholds,
>  	PT_CAP_psb_periods,
> diff --git a/arch/x86/include/asm/msr-index.h b/arch/x86/include/asm/msr-index.h
> index e0e2f7dfbd..964d7e17a6 100644
> --- a/arch/x86/include/asm/msr-index.h
> +++ b/arch/x86/include/asm/msr-index.h
> @@ -105,11 +105,29 @@
>  #define RTIT_CTL_CYC_THRESH		(0x0full << RTIT_CTL_CYC_THRESH_OFFSET)
>  #define RTIT_CTL_PSB_FREQ_OFFSET	24
>  #define RTIT_CTL_PSB_FREQ      		(0x0full << RTIT_CTL_PSB_FREQ_OFFSET)
> +#define RTIT_CTL_ADDR0_OFFSET		32
> +#define RTIT_CTL_ADDR0      		(0x0full << RTIT_CTL_ADDR0_OFFSET)
> +#define RTIT_CTL_ADDR1_OFFSET		36
> +#define RTIT_CTL_ADDR1      		(0x0full << RTIT_CTL_ADDR1_OFFSET)
> +#define RTIT_CTL_ADDR2_OFFSET		40
> +#define RTIT_CTL_ADDR2      		(0x0full << RTIT_CTL_ADDR2_OFFSET)
> +#define RTIT_CTL_ADDR3_OFFSET		44
> +#define RTIT_CTL_ADDR3      		(0x0full << RTIT_CTL_ADDR3_OFFSET)
>  #define MSR_IA32_RTIT_STATUS		0x00000571
> +#define RTIT_STATUS_FILTEREN		BIT(0)
>  #define RTIT_STATUS_CONTEXTEN		BIT(1)
>  #define RTIT_STATUS_TRIGGEREN		BIT(2)
> +#define RTIT_STATUS_BUFFOVF		BIT(3)
>  #define RTIT_STATUS_ERROR		BIT(4)
>  #define RTIT_STATUS_STOPPED		BIT(5)
> +#define MSR_IA32_RTIT_ADDR0_A		0x00000580
> +#define MSR_IA32_RTIT_ADDR0_B		0x00000581
> +#define MSR_IA32_RTIT_ADDR1_A		0x00000582
> +#define MSR_IA32_RTIT_ADDR1_B		0x00000583
> +#define MSR_IA32_RTIT_ADDR2_A		0x00000584
> +#define MSR_IA32_RTIT_ADDR2_B		0x00000585
> +#define MSR_IA32_RTIT_ADDR3_A		0x00000586
> +#define MSR_IA32_RTIT_ADDR3_B		0x00000587

So can we not turn msr-index.h a dumping ground for MSRs pls?

If those are only PT-relevant, why not define them all in pt.h?

-- 
Regards/Gruss,
    Boris.

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