Subject: Re: [PATCH 1/8] coresight: etm4x: Fixes for ETM v4.4 architecture updates.

From: Mathieu Poirier <[email-masked]>
Date: Mon, 26 Aug 2019 15:47:13 -0600

Hi Mike,

On Mon, Aug 19, 2019 at 09:57:13PM +0100, Mike Leach wrote:
> ETMv4.4 adds in support for tracing secure EL2 (per arch 8.x updates).

What is the name of the ETMv4.4 document?  I can only find up to 4.2 on line.

> Patch accounts for this new capability.
> 
> Signed-off-by: Mike Leach <[email-masked]>
> ---
>  .../hwtracing/coresight/coresight-etm4x-sysfs.c   | 12 ++++++------
>  drivers/hwtracing/coresight/coresight-etm4x.c     |  5 ++++-
>  drivers/hwtracing/coresight/coresight-etm4x.h     | 15 +++++++++++----
>  3 files changed, 21 insertions(+), 11 deletions(-)
> 
> diff --git a/drivers/hwtracing/coresight/coresight-etm4x-sysfs.c b/drivers/hwtracing/coresight/coresight-etm4x-sysfs.c
> index 219c10eb752c..b6984be0c515 100644
> --- a/drivers/hwtracing/coresight/coresight-etm4x-sysfs.c
> +++ b/drivers/hwtracing/coresight/coresight-etm4x-sysfs.c
> @@ -738,7 +738,7 @@ static ssize_t s_exlevel_vinst_show(struct device *dev,
>  	struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent);
>  	struct etmv4_config *config = &drvdata->config;
>  
> -	val = BMVAL(config->vinst_ctrl, 16, 19);
> +	val = (config->vinst_ctrl & ETM_EXLEVEL_S_VICTLR_MASK) >> 16;
>  	return scnprintf(buf, PAGE_SIZE, "%#lx\n", val);
>  }
>  
> @@ -754,8 +754,8 @@ static ssize_t s_exlevel_vinst_store(struct device *dev,
>  		return -EINVAL;
>  
>  	spin_lock(&drvdata->spinlock);
> -	/* clear all EXLEVEL_S bits (bit[18] is never implemented) */
> -	config->vinst_ctrl &= ~(BIT(16) | BIT(17) | BIT(19));
> +	/* clear all EXLEVEL_S bits  */
> +	config->vinst_ctrl &= ~(ETM_EXLEVEL_S_VICTLR_MASK);
>  	/* enable instruction tracing for corresponding exception level */
>  	val &= drvdata->s_ex_level;
>  	config->vinst_ctrl |= (val << 16);
> @@ -773,7 +773,7 @@ static ssize_t ns_exlevel_vinst_show(struct device *dev,
>  	struct etmv4_config *config = &drvdata->config;
>  
>  	/* EXLEVEL_NS, bits[23:20] */
> -	val = BMVAL(config->vinst_ctrl, 20, 23);
> +	val = (config->vinst_ctrl & ETM_EXLEVEL_NS_VICTLR_MASK) >> 20;
>  	return scnprintf(buf, PAGE_SIZE, "%#lx\n", val);
>  }
>  
> @@ -789,8 +789,8 @@ static ssize_t ns_exlevel_vinst_store(struct device *dev,
>  		return -EINVAL;
>  
>  	spin_lock(&drvdata->spinlock);
> -	/* clear EXLEVEL_NS bits (bit[23] is never implemented */
> -	config->vinst_ctrl &= ~(BIT(20) | BIT(21) | BIT(22));
> +	/* clear EXLEVEL_NS bits  */
> +	config->vinst_ctrl &= ~(ETM_EXLEVEL_NS_VICTLR_MASK);
>  	/* enable instruction tracing for corresponding exception level */
>  	val &= drvdata->ns_ex_level;
>  	config->vinst_ctrl |= (val << 20);
> diff --git a/drivers/hwtracing/coresight/coresight-etm4x.c b/drivers/hwtracing/coresight/coresight-etm4x.c
> index a128b5063f46..52b8876de157 100644
> --- a/drivers/hwtracing/coresight/coresight-etm4x.c
> +++ b/drivers/hwtracing/coresight/coresight-etm4x.c
> @@ -629,6 +629,7 @@ static void etm4_init_arch_data(void *info)
>  	 * TRCARCHMAJ, bits[11:8] architecture major versin number
>  	 */
>  	drvdata->arch = BMVAL(etmidr1, 4, 11);
> +	drvdata->config.arch = drvdata->arch;
>  
>  	/* maximum size of resources */
>  	etmidr2 = readl_relaxed(drvdata->base + TRCIDR2);
> @@ -780,6 +781,7 @@ static u64 etm4_get_ns_access_type(struct etmv4_config *config)
>  static u64 etm4_get_access_type(struct etmv4_config *config)
>  {
>  	u64 access_type = etm4_get_ns_access_type(config);
> +	u64 s_hyp = (config->arch & 0x0f) >= 0x4 ? ETM_EXLEVEL_S_HYP : 0;
>  
>  	/*
>  	 * EXLEVEL_S, bits[11:8], don't trace anything happening
> @@ -787,7 +789,8 @@ static u64 etm4_get_access_type(struct etmv4_config *config)
>  	 */
>  	access_type |= (ETM_EXLEVEL_S_APP	|
>  			ETM_EXLEVEL_S_OS	|
> -			ETM_EXLEVEL_S_HYP);
> +			s_hyp			|
> +			ETM_EXLEVEL_S_MON);
>  
>  	return access_type;
>  }
> diff --git a/drivers/hwtracing/coresight/coresight-etm4x.h b/drivers/hwtracing/coresight/coresight-etm4x.h
> index 4523f10ddd0f..60bc2fb5159b 100644
> --- a/drivers/hwtracing/coresight/coresight-etm4x.h
> +++ b/drivers/hwtracing/coresight/coresight-etm4x.h
> @@ -180,17 +180,22 @@
>  /* PowerDown Control Register bits */
>  #define TRCPDCR_PU			BIT(3)
>  
> -/* secure state access levels */
> +/* secure state access levels - TRCACATRn */
>  #define ETM_EXLEVEL_S_APP		BIT(8)
>  #define ETM_EXLEVEL_S_OS		BIT(9)
> -#define ETM_EXLEVEL_S_NA		BIT(10)
> -#define ETM_EXLEVEL_S_HYP		BIT(11)
> -/* non-secure state access levels */
> +#define ETM_EXLEVEL_S_HYP		BIT(10)
> +#define ETM_EXLEVEL_S_MON		BIT(11)
> +/* non-secure state access levels - TRCACATRn */
>  #define ETM_EXLEVEL_NS_APP		BIT(12)
>  #define ETM_EXLEVEL_NS_OS		BIT(13)
>  #define ETM_EXLEVEL_NS_HYP		BIT(14)
>  #define ETM_EXLEVEL_NS_NA		BIT(15)
>  
> +/* secure / non secure masks - TRCVICTLR, IDR3 */
> +#define ETM_EXLEVEL_S_VICTLR_MASK	GENMASK(19, 16)
> +/* NS MON (EL3) mode never implemented */
> +#define ETM_EXLEVEL_NS_VICTLR_MASK	GENMASK(22, 20)

It is hard to say without documentation but shouldn't this be GENMASK(23, 20)?  

> +
>  /**
>   * struct etmv4_config - configuration information related to an ETMv4
>   * @mode:	Controls various modes supported by this ETM.
> @@ -237,6 +242,7 @@
>   * @vmid_mask0:	VM ID comparator mask for comparator 0-3.
>   * @vmid_mask1:	VM ID comparator mask for comparator 4-7.
>   * @ext_inp:	External input selection.
> + * @arch:	ETM architecture version (for arch dependent config).
>   */
>  struct etmv4_config {
>  	u32				mode;
> @@ -279,6 +285,7 @@ struct etmv4_config {
>  	u32				vmid_mask0;
>  	u32				vmid_mask1;
>  	u32				ext_inp;
> +	u8				arch;
>  };
>  
>  /**
> -- 
> 2.17.1
> 

_______________________________________________
linux-arm-kernel mailing list
[email-masked]
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel