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Date: Tue, 12 Apr 2022 09:49:04 +0100
From: Mike Leach <mike.leach@...aro.org>
To: James Clark <James.Clark@....com>
Cc: suzuki.poulose@....com, coresight@...ts.linaro.org,
Anshuman.Khandual@....com, mathieu.poirier@...aro.org,
leo.yan@...aro.com, Leo Yan <leo.yan@...aro.org>,
linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 06/15] coresight: etm4x: Cleanup TRCCONFIGR register accesses
On Fri, 4 Mar 2022 at 17:19, James Clark <james.clark@....com> wrote:
>
> This is a no-op change for style and consistency and has no effect on
> the binary output by the compiler. In sysreg.h fields are defined as
> the register name followed by the field name and then _MASK. This
> allows for grepping for fields by name rather than using magic numbers.
>
> Signed-off-by: James Clark <james.clark@....com>
> ---
> .../coresight/coresight-etm4x-core.c | 12 ++---
> .../coresight/coresight-etm4x-sysfs.c | 46 +++++++++----------
> drivers/hwtracing/coresight/coresight-etm4x.h | 16 +++++++
> 3 files changed, 44 insertions(+), 30 deletions(-)
>
> diff --git a/drivers/hwtracing/coresight/coresight-etm4x-core.c b/drivers/hwtracing/coresight/coresight-etm4x-core.c
> index 3f4263117570..445e2057d5ed 100644
> --- a/drivers/hwtracing/coresight/coresight-etm4x-core.c
> +++ b/drivers/hwtracing/coresight/coresight-etm4x-core.c
> @@ -633,7 +633,7 @@ static int etm4_parse_event_config(struct coresight_device *csdev,
>
> /* Go from generic option to ETMv4 specifics */
> if (attr->config & BIT(ETM_OPT_CYCACC)) {
> - config->cfg |= BIT(4);
> + config->cfg |= TRCCONFIGR_CCI;
> /* TRM: Must program this for cycacc to work */
> config->ccctlr = ETM_CYC_THRESHOLD_DEFAULT;
> }
> @@ -653,14 +653,14 @@ static int etm4_parse_event_config(struct coresight_device *csdev,
> goto out;
>
> /* bit[11], Global timestamp tracing bit */
> - config->cfg |= BIT(11);
> + config->cfg |= TRCCONFIGR_TS;
> }
>
> /* Only trace contextID when runs in root PID namespace */
> if ((attr->config & BIT(ETM_OPT_CTXTID)) &&
> task_is_in_init_pid_ns(current))
> /* bit[6], Context ID tracing bit */
> - config->cfg |= BIT(ETM4_CFG_BIT_CTXTID);
> + config->cfg |= TRCCONFIGR_CID;
>
> /*
> * If set bit ETM_OPT_CTXTID2 in perf config, this asks to trace VMID
> @@ -672,17 +672,15 @@ static int etm4_parse_event_config(struct coresight_device *csdev,
> ret = -EINVAL;
> goto out;
> }
> -
> /* Only trace virtual contextID when runs in root PID namespace */
> if (task_is_in_init_pid_ns(current))
> - config->cfg |= BIT(ETM4_CFG_BIT_VMID) |
> - BIT(ETM4_CFG_BIT_VMID_OPT);
> + config->cfg |= TRCCONFIGR_VMID | TRCCONFIGR_VMIDOPT;
> }
>
> /* return stack - enable if selected and supported */
> if ((attr->config & BIT(ETM_OPT_RETSTK)) && drvdata->retstack)
> /* bit[12], Return stack enable bit */
> - config->cfg |= BIT(12);
> + config->cfg |= TRCCONFIGR_RS;
>
> /*
> * Set any selected configuration and preset.
> diff --git a/drivers/hwtracing/coresight/coresight-etm4x-sysfs.c b/drivers/hwtracing/coresight/coresight-etm4x-sysfs.c
> index 21687cc1e4e2..53f84da3fe44 100644
> --- a/drivers/hwtracing/coresight/coresight-etm4x-sysfs.c
> +++ b/drivers/hwtracing/coresight/coresight-etm4x-sysfs.c
> @@ -180,12 +180,12 @@ static ssize_t reset_store(struct device *dev,
>
> /* Disable data tracing: do not trace load and store data transfers */
> config->mode &= ~(ETM_MODE_LOAD | ETM_MODE_STORE);
> - config->cfg &= ~(BIT(1) | BIT(2));
> + config->cfg &= ~(TRCCONFIGR_INSTP0_LOAD | TRCCONFIGR_INSTP0_STORE);
>
> /* Disable data value and data address tracing */
> config->mode &= ~(ETM_MODE_DATA_TRACE_ADDR |
> ETM_MODE_DATA_TRACE_VAL);
> - config->cfg &= ~(BIT(16) | BIT(17));
> + config->cfg &= ~(TRCCONFIGR_DA | TRCCONFIGR_DV);
>
> /* Disable all events tracing */
> config->eventctrl0 = 0x0;
> @@ -304,82 +304,82 @@ static ssize_t mode_store(struct device *dev,
>
> if (drvdata->instrp0 == true) {
> /* start by clearing instruction P0 field */
> - config->cfg &= ~(BIT(1) | BIT(2));
> + config->cfg &= ~TRCCONFIGR_INSTP0_LOAD_STORE;
> if (config->mode & ETM_MODE_LOAD)
> /* 0b01 Trace load instructions as P0 instructions */
> - config->cfg |= BIT(1);
> + config->cfg |= TRCCONFIGR_INSTP0_LOAD;
> if (config->mode & ETM_MODE_STORE)
> /* 0b10 Trace store instructions as P0 instructions */
> - config->cfg |= BIT(2);
> + config->cfg |= TRCCONFIGR_INSTP0_STORE;
> if (config->mode & ETM_MODE_LOAD_STORE)
> /*
> * 0b11 Trace load and store instructions
> * as P0 instructions
> */
> - config->cfg |= BIT(1) | BIT(2);
> + config->cfg |= TRCCONFIGR_INSTP0_LOAD_STORE;
> }
>
> /* bit[3], Branch broadcast mode */
> if ((config->mode & ETM_MODE_BB) && (drvdata->trcbb == true))
> - config->cfg |= BIT(3);
> + config->cfg |= TRCCONFIGR_BB;
> else
> - config->cfg &= ~BIT(3);
> + config->cfg &= ~TRCCONFIGR_BB;
>
> /* bit[4], Cycle counting instruction trace bit */
> if ((config->mode & ETMv4_MODE_CYCACC) &&
> (drvdata->trccci == true))
> - config->cfg |= BIT(4);
> + config->cfg |= TRCCONFIGR_CCI;
> else
> - config->cfg &= ~BIT(4);
> + config->cfg &= ~TRCCONFIGR_CCI;
>
> /* bit[6], Context ID tracing bit */
> if ((config->mode & ETMv4_MODE_CTXID) && (drvdata->ctxid_size))
> - config->cfg |= BIT(6);
> + config->cfg |= TRCCONFIGR_CID;
> else
> - config->cfg &= ~BIT(6);
> + config->cfg &= ~TRCCONFIGR_CID;
>
> if ((config->mode & ETM_MODE_VMID) && (drvdata->vmid_size))
> - config->cfg |= BIT(7);
> + config->cfg |= TRCCONFIGR_VMID;
> else
> - config->cfg &= ~BIT(7);
> + config->cfg &= ~TRCCONFIGR_VMID;
>
> /* bits[10:8], Conditional instruction tracing bit */
> mode = ETM_MODE_COND(config->mode);
> if (drvdata->trccond == true) {
> - config->cfg &= ~(BIT(8) | BIT(9) | BIT(10));
> - config->cfg |= mode << 8;
> + config->cfg &= ~TRCCONFIGR_COND_MASK;
> + config->cfg |= mode << __bf_shf(TRCCONFIGR_COND_MASK);
> }
>
> /* bit[11], Global timestamp tracing bit */
> if ((config->mode & ETMv4_MODE_TIMESTAMP) && (drvdata->ts_size))
> - config->cfg |= BIT(11);
> + config->cfg |= TRCCONFIGR_TS;
> else
> - config->cfg &= ~BIT(11);
> + config->cfg &= ~TRCCONFIGR_TS;
>
> /* bit[12], Return stack enable bit */
> if ((config->mode & ETM_MODE_RETURNSTACK) &&
> (drvdata->retstack == true))
> - config->cfg |= BIT(12);
> + config->cfg |= TRCCONFIGR_RS;
> else
> - config->cfg &= ~BIT(12);
> + config->cfg &= ~TRCCONFIGR_RS;
>
> /* bits[14:13], Q element enable field */
> mode = ETM_MODE_QELEM(config->mode);
> /* start by clearing QE bits */
> - config->cfg &= ~(BIT(13) | BIT(14));
> + config->cfg &= ~(TRCCONFIGR_QE_W_COUNTS | TRCCONFIGR_QE_WO_COUNTS);
> /*
> * if supported, Q elements with instruction counts are enabled.
> * Always set the low bit for any requested mode. Valid combos are
> * 0b00, 0b01 and 0b11.
> */
> if (mode && drvdata->q_support)
> - config->cfg |= BIT(13);
> + config->cfg |= TRCCONFIGR_QE_W_COUNTS;
> /*
> * if supported, Q elements with and without instruction
> * counts are enabled
> */
> if ((mode & BIT(1)) && (drvdata->q_support & BIT(1)))
> - config->cfg |= BIT(14);
> + config->cfg |= TRCCONFIGR_QE_WO_COUNTS;
>
> /* bit[11], AMBA Trace Bus (ATB) trigger enable bit */
> if ((config->mode & ETM_MODE_ATB_TRIGGER) &&
> diff --git a/drivers/hwtracing/coresight/coresight-etm4x.h b/drivers/hwtracing/coresight/coresight-etm4x.h
> index 3b604cde668b..4c8d7be3c159 100644
> --- a/drivers/hwtracing/coresight/coresight-etm4x.h
> +++ b/drivers/hwtracing/coresight/coresight-etm4x.h
> @@ -172,6 +172,22 @@
> #define TRCIDR5_NUMSEQSTATE_MASK GENMASK(27, 25)
> #define TRCIDR5_NUMCNTR_MASK GENMASK(30, 28)
>
> +#define TRCCONFIGR_INSTP0_LOAD BIT(1)
> +#define TRCCONFIGR_INSTP0_STORE BIT(2)
> +#define TRCCONFIGR_INSTP0_LOAD_STORE (TRCCONFIGR_INSTP0_LOAD | TRCCONFIGR_INSTP0_STORE)
> +#define TRCCONFIGR_BB BIT(3)
> +#define TRCCONFIGR_CCI BIT(4)
> +#define TRCCONFIGR_CID BIT(6)
> +#define TRCCONFIGR_VMID BIT(7)
> +#define TRCCONFIGR_COND_MASK GENMASK(10, 8)
> +#define TRCCONFIGR_TS BIT(11)
> +#define TRCCONFIGR_RS BIT(12)
> +#define TRCCONFIGR_QE_W_COUNTS BIT(13)
> +#define TRCCONFIGR_QE_WO_COUNTS BIT(14)
> +#define TRCCONFIGR_VMIDOPT BIT(15)
> +#define TRCCONFIGR_DA BIT(16)
> +#define TRCCONFIGR_DV BIT(17)
> +
> /*
> * System instructions to access ETM registers.
> * See ETMv4.4 spec ARM IHI0064F section 4.3.6 System instructions
> --
> 2.28.0
>
Reviewed-by: Mike Leach <mike.leach@...aro.org>
--
Mike Leach
Principal Engineer, ARM Ltd.
Manchester Design Centre. UK
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