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Date: Sat, 14 Nov 2020 13:36:50 +0800
From: Tingwei Zhang <tingweiz@...eaurora.org>
To: Anshuman Khandual <anshuman.khandual@....com>
Cc: linux-arm-kernel@...ts.infradead.org, coresight@...ts.linaro.org,
mike.leach@...aro.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC 06/11] coresight: ete: Detect ETE as one of the supported
ETMs
Hi Anshuman,
On Tue, Nov 10, 2020 at 08:45:04PM +0800, Anshuman Khandual wrote:
> From: Suzuki K Poulose <suzuki.poulose@....com>
>
> Add ETE as one of the supported device types we support
> with ETM4x driver. The devices are named following the
> existing convention as ete<N>.
>
> ETE mandates that the trace resource status register is programmed
> before the tracing is turned on. For the moment simply write to
> it indicating TraceActive.
>
> Signed-off-by: Suzuki K Poulose <suzuki.poulose@....com>
> Signed-off-by: Anshuman Khandual <anshuman.khandual@....com>
> ---
> .../devicetree/bindings/arm/coresight.txt | 3 ++
> drivers/hwtracing/coresight/coresight-etm4x-core.c | 55
> +++++++++++++++++-----
> drivers/hwtracing/coresight/coresight-etm4x.h | 7 +++
> 3 files changed, 52 insertions(+), 13 deletions(-)
>
> diff --git a/Documentation/devicetree/bindings/arm/coresight.txt
> b/Documentation/devicetree/bindings/arm/coresight.txt
> index bff96a5..784cc1b 100644
> --- a/Documentation/devicetree/bindings/arm/coresight.txt
> +++ b/Documentation/devicetree/bindings/arm/coresight.txt
> @@ -40,6 +40,9 @@ its hardware characteristcs.
> - Embedded Trace Macrocell with system register access only.
> "arm,coresight-etm-sysreg";
>
> + - Embedded Trace Extensions.
> + "arm,ete"
> +
> - Coresight programmable Replicator :
> "arm,coresight-dynamic-replicator", "arm,primecell";
>
> diff --git a/drivers/hwtracing/coresight/coresight-etm4x-core.c
> b/drivers/hwtracing/coresight/coresight-etm4x-core.c
> index 15b6e94..0fea349 100644
> --- a/drivers/hwtracing/coresight/coresight-etm4x-core.c
> +++ b/drivers/hwtracing/coresight/coresight-etm4x-core.c
> @@ -331,6 +331,13 @@ static int etm4_enable_hw(struct etmv4_drvdata
> *drvdata)
> etm4x_relaxed_write32(csa, trcpdcr | TRCPDCR_PU, TRCPDCR);
> }
>
> + /*
> + * ETE mandates that the TRCRSR is written to before
> + * enabling it.
> + */
> + if (drvdata->arch >= ETM_ARCH_ETE)
> + etm4x_relaxed_write32(csa, TRCRSR_TA, TRCRSR);
> +
> /* Enable the trace unit */
> etm4x_relaxed_write32(csa, 1, TRCPRGCTLR);
>
> @@ -763,13 +770,24 @@ static bool etm_init_sysreg_access(struct
> etmv4_drvdata *drvdata,
> * ETMs implementing sysreg access must implement TRCDEVARCH.
> */
> devarch = read_etm4x_sysreg_const_offset(TRCDEVARCH);
> - if ((devarch & ETM_DEVARCH_ID_MASK) != ETM_DEVARCH_ETMv4x_ARCH)
> + switch (devarch & ETM_DEVARCH_ID_MASK) {
> + case ETM_DEVARCH_ETMv4x_ARCH:
> + *csa = (struct csdev_access) {
> + .io_mem = false,
> + .read = etm4x_sysreg_read,
> + .write = etm4x_sysreg_write,
> + };
> + break;
> + case ETM_DEVARCH_ETE_ARCH:
> + *csa = (struct csdev_access) {
> + .io_mem = false,
> + .read = ete_sysreg_read,
> + .write = ete_sysreg_write,
> + };
> + break;
> + default:
> return false;
> - *csa = (struct csdev_access) {
> - .io_mem = false,
> - .read = etm4x_sysreg_read,
> - .write = etm4x_sysreg_write,
> - };
> + }
>
> drvdata->arch = etm_devarch_to_arch(devarch);
> return true;
> @@ -1698,6 +1716,8 @@ static int etm4_probe(struct device *dev, void __iomem
> *base)
> struct etmv4_drvdata *drvdata;
> struct coresight_desc desc = { 0 };
> struct etm_init_arg init_arg = { 0 };
> + u8 major, minor;
> + char *type_name;
>
> drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
> if (!drvdata)
> @@ -1724,10 +1744,6 @@ static int etm4_probe(struct device *dev, void
> __iomem *base)
> if (drvdata->cpu < 0)
> return drvdata->cpu;
>
> - desc.name = devm_kasprintf(dev, GFP_KERNEL, "etm%d", drvdata->cpu);
> - if (!desc.name)
> - return -ENOMEM;
> -
> init_arg.drvdata = drvdata;
> init_arg.csa = &desc.access;
>
> @@ -1742,6 +1758,19 @@ static int etm4_probe(struct device *dev, void
> __iomem *base)
> if (!desc.access.io_mem ||
> fwnode_property_present(dev_fwnode(dev), "qcom,skip-power-up"))
> drvdata->skip_power_up = true;
> + major = ETM_ARCH_MAJOR_VERSION(drvdata->arch);
> + minor = ETM_ARCH_MINOR_VERSION(drvdata->arch);
> + if (drvdata->arch >= ETM_ARCH_ETE) {
> + type_name = "ete";
> + major -= 4;
> + } else {
> + type_name = "etm";
> + }
> +
When trace unit supports ETE, could it be still compatible with ETMv4.4?
Can use selectively use it as ETM instead of ETE?
Thanks,
Tingwei
> + desc.name = devm_kasprintf(dev, GFP_KERNEL,
> + "%s%d", type_name, drvdata->cpu);
> + if (!desc.name)
> + return -ENOMEM;
>
> etm4_init_trace_id(drvdata);
> etm4_set_default(&drvdata->config);
> @@ -1770,9 +1799,8 @@ static int etm4_probe(struct device *dev, void __iomem
> *base)
>
> etmdrvdata[drvdata->cpu] = drvdata;
>
> - dev_info(&drvdata->csdev->dev, "CPU%d: ETM v%d.%d initialized\n",
> - drvdata->cpu, ETM_ARCH_MAJOR_VERSION(drvdata->arch),
> - ETM_ARCH_MINOR_VERSION(drvdata->arch));
> + dev_info(&drvdata->csdev->dev, "CPU%d: %s v%d.%d initialized\n",
> + drvdata->cpu, type_name, major, minor);
>
> if (boot_enable) {
> coresight_enable(drvdata->csdev);
> @@ -1892,6 +1920,7 @@ static struct amba_driver etm4x_amba_driver = {
>
> static const struct of_device_id etm_sysreg_match[] = {
> { .compatible = "arm,coresight-etm-sysreg" },
> + { .compatible = "arm,ete" },
> {}
> };
>
> diff --git a/drivers/hwtracing/coresight/coresight-etm4x.h
> b/drivers/hwtracing/coresight/coresight-etm4x.h
> index 00c0367..05fd0e5 100644
> --- a/drivers/hwtracing/coresight/coresight-etm4x.h
> +++ b/drivers/hwtracing/coresight/coresight-etm4x.h
> @@ -127,6 +127,8 @@
> #define TRCCIDR2 0xFF8
> #define TRCCIDR3 0xFFC
>
> +#define TRCRSR_TA BIT(12)
> +
> /*
> * System instructions to access ETM registers.
> * See ETMv4.4 spec ARM IHI0064F section 4.3.6 System instructions
> @@ -570,11 +572,14 @@
> ((ETM_DEVARCH_MAKE_ARCHID_ARCH_VER(major)) |
> ETM_DEVARCH_ARCHID_ARCH_PART(0xA13))
>
> #define ETM_DEVARCH_ARCHID_ETMv4x ETM_DEVARCH_MAKE_ARCHID(0x4)
> +#define ETM_DEVARCH_ARCHID_ETE ETM_DEVARCH_MAKE_ARCHID(0x5)
>
> #define ETM_DEVARCH_ID_MASK \
> (ETM_DEVARCH_ARCHITECT_MASK | ETM_DEVARCH_ARCHID_MASK |
> ETM_DEVARCH_PRESENT)
> #define ETM_DEVARCH_ETMv4x_ARCH \
> (ETM_DEVARCH_ARCHITECT_ARM | ETM_DEVARCH_ARCHID_ETMv4x |
> ETM_DEVARCH_PRESENT)
> +#define ETM_DEVARCH_ETE_ARCH \
> + (ETM_DEVARCH_ARCHITECT_ARM | ETM_DEVARCH_ARCHID_ETE | ETM_DEVARCH_PRESENT)
>
> #define TRCSTATR_IDLE_BIT 0
> #define TRCSTATR_PMSTABLE_BIT 1
> @@ -661,6 +666,8 @@
> #define ETM_ARCH_MINOR_VERSION(arch) ((arch) & 0xfU)
>
> #define ETM_ARCH_V4 ETM_ARCH_VERSION(4, 0)
> +#define ETM_ARCH_ETE ETM_ARCH_VERSION(5, 0)
> +
> /* Interpretation of resource numbers change at ETM v4.3 architecture */
> #define ETM_ARCH_V4_3 ETM_ARCH_VERSION(4, 3)
>
> --
> 2.7.4
>
> _______________________________________________
> CoreSight mailing list
> CoreSight@...ts.linaro.org
> https://lists.linaro.org/mailman/listinfo/coresight
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