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From: Catalin Marinas <catalin.marinas@arm.com>
To: Suzuki K Poulose <suzuki.poulose@arm.com>
Cc: linux-arm-kernel@lists.infradead.org, mathieu.poirier@linaro.org,
	mike.leach@linaro.org, linux-kernel@vger.kernel.org,
	anshuman.khandual@arm.com, jonathan.zhouwen@huawei.com,
	coresight@lists.linaro.org, Will Deacon <will@kernel.org>
Subject: Re: [PATCH v4 25/25] coresight: Add support for v8.4 SelfHosted tracing
Date: Thu, 19 Nov 2020 17:22:43 +0000	[thread overview]
Message-ID: <20201119172243.GF4376@gaia> (raw)
In-Reply-To: <20201119164547.2982871-26-suzuki.poulose@arm.com>

On Thu, Nov 19, 2020 at 04:45:47PM +0000, Suzuki K Poulose wrote:
> From: Jonathan Zhou <jonathan.zhouwen@huawei.com>
> 
> v8.4 tracing extensions added support for trace filtering controlled
> by TRFCR_ELx. This must be programmed to allow tracing at EL1/EL2 and
> EL0. The timestamp used is the virtual time. Also enable CONTEXIDR_EL2
> tracing if we are running the kernel at EL2.
> 
> Cc: Catalin Marinas <catalin.marinas@arm.com>
> Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
> Cc: Mike Leach <mike.leach@linaro.org>
> Cc: Will Deacon <will@kernel.org>
> Signed-off-by: Jonathan Zhou <jonathan.zhouwen@huawei.com>
> [ Move the trace filtering setup etm_init_arch_data() and
>  clean ups]
> Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
> ---
>  .../coresight/coresight-etm4x-core.c          | 25 +++++++++++++++++++
>  1 file changed, 25 insertions(+)
> 
> diff --git a/drivers/hwtracing/coresight/coresight-etm4x-core.c b/drivers/hwtracing/coresight/coresight-etm4x-core.c
> index 1d054d2ab2a0..647685736134 100644
> --- a/drivers/hwtracing/coresight/coresight-etm4x-core.c
> +++ b/drivers/hwtracing/coresight/coresight-etm4x-core.c
> @@ -760,6 +760,30 @@ static bool etm4_init_csdev_access(struct etmv4_drvdata *drvdata,
>  	return false;
>  }
>  
> +static void cpu_enable_tracing(void)
> +{
> +	u64 dfr0 = read_sysreg(id_aa64dfr0_el1);
> +	u64 trfcr;
> +
> +	if (!(dfr0 >> ID_AA64DFR0_TRACE_FILT_SHIFT))
> +		return;

What if we get a new field at position 44 while the FILT one at 40 is 0?
We should use cpuid_feature_extract_field() here.

BTW, can this function not go in the cpufeature.c code?

-- 
Catalin

  reply	other threads:[~2020-11-19 17:22 UTC|newest]

Thread overview: 49+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-11-19 16:45 [PATCH v4 00/26] coresight: etm4x: Support for system instructions Suzuki K Poulose
2020-11-19 16:45 ` [PATCH v4 01/25] coresight: etm4x: Handle access to TRCSSPCICRn Suzuki K Poulose
2020-11-19 16:45 ` [PATCH v4 02/25] coresight: etm4x: Skip accessing TRCPDCR in save/restore Suzuki K Poulose
2020-11-20  5:40   ` Sai Prakash Ranjan
2020-11-27 18:55   ` Mathieu Poirier
2020-11-30  9:37     ` Suzuki K Poulose
2020-11-19 16:45 ` [PATCH v4 03/25] coresight: Introduce device access abstraction Suzuki K Poulose
2020-11-27 19:11   ` Mathieu Poirier
2020-11-19 16:45 ` [PATCH v4 04/25] coresight: tpiu: Prepare for using coresight " Suzuki K Poulose
2020-11-19 16:45 ` [PATCH v4 05/25] coresight: Convert coresight_timeout to use " Suzuki K Poulose
2020-11-30 20:55   ` Mathieu Poirier
2020-11-19 16:45 ` [PATCH v4 06/25] coresight: Convert claim/disclaim operations to use access wrappers Suzuki K Poulose
2020-11-30 21:04   ` Mathieu Poirier
2020-11-19 16:45 ` [PATCH v4 07/25] coresight: etm4x: Always read the registers on the host CPU Suzuki K Poulose
2020-11-19 16:45 ` [PATCH v4 08/25] coresight: etm4x: Convert all register accesses Suzuki K Poulose
2020-11-19 16:45 ` [PATCH v4 09/25] coresight: etm4x: Add commentary on the registers Suzuki K Poulose
2020-11-19 16:45 ` [PATCH v4 10/25] coresight: etm4x: Add sysreg access helpers Suzuki K Poulose
2020-11-19 16:45 ` [PATCH v4 11/25] coresight: etm4x: Define DEVARCH register fields Suzuki K Poulose
2020-11-30 21:19   ` Mathieu Poirier
2020-11-19 16:45 ` [PATCH v4 12/25] coresight: etm4x: Check for Software Lock Suzuki K Poulose
2020-11-19 16:45 ` [PATCH v4 13/25] coresight: etm4x: Cleanup secure exception level masks Suzuki K Poulose
2020-11-30 21:25   ` Mathieu Poirier
2020-11-19 16:45 ` [PATCH v4 14/25] coresight: etm4x: Clean up " Suzuki K Poulose
2020-11-30 21:45   ` Mathieu Poirier
2020-11-19 16:45 ` [PATCH v4 15/25] coresight: etm4x: Handle ETM architecture version Suzuki K Poulose
2020-11-30 21:48   ` Mathieu Poirier
2020-11-19 16:45 ` [PATCH v4 16/25] coresight: etm4x: Detect access early on the target CPU Suzuki K Poulose
2020-11-30 21:53   ` Mathieu Poirier
2020-11-19 16:45 ` [PATCH v4 17/25] coresight: etm4x: Use TRCDEVARCH for component discovery Suzuki K Poulose
2020-11-27 18:28   ` Mathieu Poirier
2020-11-30  9:30     ` Suzuki K Poulose
2020-11-19 16:45 ` [PATCH v4 18/25] coresight: etm4x: Expose trcdevarch via trcidr Suzuki K Poulose
2020-11-30 22:42   ` Mathieu Poirier
2020-11-19 16:45 ` [PATCH v4 19/25] coresight: etm4x: Add necessary synchronization for sysreg access Suzuki K Poulose
2020-11-19 16:45 ` [PATCH v4 20/25] coresight: etm4x: Detect system instructions support Suzuki K Poulose
2020-11-23  7:58   ` Tingwei Zhang
2020-11-23  9:39     ` Suzuki K Poulose
2020-11-24  0:41       ` Tingwei Zhang
2020-11-24 11:38         ` Suzuki K Poulose
2020-11-25  4:57           ` Tingwei Zhang
2020-11-19 16:45 ` [PATCH v4 21/25] coresight: etm4x: Refactor probing routine Suzuki K Poulose
2020-11-19 16:45 ` [PATCH v4 22/25] coresight: etm4x: Add support for sysreg only devices Suzuki K Poulose
2020-11-19 16:45 ` [PATCH v4 23/25] dts: bindings: coresight: ETM system register access only units Suzuki K Poulose
2020-11-19 16:45 ` [PATCH v4 24/25] arm64: Add TRFCR_ELx definitions Suzuki K Poulose
2020-11-19 17:18   ` Catalin Marinas
2020-11-20 10:03     ` Suzuki K Poulose
2020-11-19 16:45 ` [PATCH v4 25/25] coresight: Add support for v8.4 SelfHosted tracing Suzuki K Poulose
2020-11-19 17:22   ` Catalin Marinas [this message]
2020-11-20 10:03     ` Suzuki K Poulose

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