linux-kernel - Re: [PATCH v2 1/5] powerpc/include: Add data structures and macros for IMC trace mode

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Message-Id: <1dc10184-c351-2114-5814-aac5bf2ee5c9@linux.vnet.ibm.com>
Date:   Wed, 19 Dec 2018 11:34:43 +0530
From:   Madhavan Srinivasan <maddy@...ux.vnet.ibm.com>
To:     Anju T Sudhakar <anju@...ux.vnet.ibm.com>, mpe@...erman.id.au,
        linux-kernel@...r.kernel.org
Cc:     linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH v2 1/5] powerpc/include: Add data structures and macros
 for IMC trace mode


On 14/12/18 2:41 PM, Anju T Sudhakar wrote:
> Add the macros needed for IMC (In-Memory Collection Counters) trace-mode
> and data structure to hold the trace-imc record data.
> Also, add the new type "OPAL_IMC_COUNTERS_TRACE" in 'opal-api.h', since
> there is a new switch case added in the opal-calls for IMC.

Reviewed-by: Madhavan Srinivasan <maddy@...ux.vnet.ibm.com>

> Signed-off-by: Anju T Sudhakar <anju@...ux.vnet.ibm.com>
> ---
>   arch/powerpc/include/asm/imc-pmu.h  | 39 +++++++++++++++++++++++++++++
>   arch/powerpc/include/asm/opal-api.h |  1 +
>   2 files changed, 40 insertions(+)
>
> diff --git a/arch/powerpc/include/asm/imc-pmu.h b/arch/powerpc/include/asm/imc-pmu.h
> index 69f516ecb2fd..7c2ef0e42661 100644
> --- a/arch/powerpc/include/asm/imc-pmu.h
> +++ b/arch/powerpc/include/asm/imc-pmu.h
> @@ -33,6 +33,7 @@
>    */
>   #define THREAD_IMC_LDBAR_MASK           0x0003ffffffffe000ULL
>   #define THREAD_IMC_ENABLE               0x8000000000000000ULL
> +#define TRACE_IMC_ENABLE		0x4000000000000000ULL
>
>   /*
>    * For debugfs interface for imc-mode and imc-command
> @@ -59,6 +60,34 @@ struct imc_events {
>   	char *scale;
>   };
>
> +/*
> + * Trace IMC hardware updates a 64bytes record on
> + * Core Performance Monitoring Counter (CPMC)
> + * overflow. Here is the layout for the trace imc record
> + *
> + * DW 0 : Timebase
> + * DW 1 : Program Counter
> + * DW 2 : PIDR information
> + * DW 3 : CPMC1
> + * DW 4 : CPMC2
> + * DW 5 : CPMC3
> + * Dw 6 : CPMC4
> + * DW 7 : Timebase
> + * .....
> + *
> + * The following is the data structure to hold trace imc data.
> + */
> +struct trace_imc_data {
> +	u64 tb1;
> +	u64 ip;
> +	u64 val;
> +	u64 cpmc1;
> +	u64 cpmc2;
> +	u64 cpmc3;
> +	u64 cpmc4;
> +	u64 tb2;
> +};
> +
>   /* Event attribute array index */
>   #define IMC_FORMAT_ATTR		0
>   #define IMC_EVENT_ATTR		1
> @@ -68,6 +97,13 @@ struct imc_events {
>   /* PMU Format attribute macros */
>   #define IMC_EVENT_OFFSET_MASK	0xffffffffULL
>
> +/*
> + * Macro to mask bits 0:21 of first double word(which is the timebase) to
> + * compare with 8th double word (timebase) of trace imc record data.
> + */
> +#define IMC_TRACE_RECORD_TB1_MASK      0x3ffffffffffULL
> +
> +
>   /*
>    * Device tree parser code detects IMC pmu support and
>    * registers new IMC pmus. This structure will hold the
> @@ -113,6 +149,7 @@ struct imc_pmu_ref {
>
>   enum {
>   	IMC_TYPE_THREAD		= 0x1,
> +	IMC_TYPE_TRACE		= 0x2,
>   	IMC_TYPE_CORE		= 0x4,
>   	IMC_TYPE_CHIP           = 0x10,
>   };
> @@ -123,6 +160,8 @@ enum {
>   #define IMC_DOMAIN_NEST		1
>   #define IMC_DOMAIN_CORE		2
>   #define IMC_DOMAIN_THREAD	3
> +/* For trace-imc the domain is still thread but it operates in trace-mode */
> +#define IMC_DOMAIN_TRACE	4
>
>   extern int init_imc_pmu(struct device_node *parent,
>   				struct imc_pmu *pmu_ptr, int pmu_id);
> diff --git a/arch/powerpc/include/asm/opal-api.h b/arch/powerpc/include/asm/opal-api.h
> index 870fb7b239ea..a4130b21b159 100644
> --- a/arch/powerpc/include/asm/opal-api.h
> +++ b/arch/powerpc/include/asm/opal-api.h
> @@ -1118,6 +1118,7 @@ enum {
>   enum {
>   	OPAL_IMC_COUNTERS_NEST = 1,
>   	OPAL_IMC_COUNTERS_CORE = 2,
> +	OPAL_IMC_COUNTERS_TRACE = 3,
>   };
>
>