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Date: Wed, 3 Jul 2019 14:03:53 -0600
From: Mathieu Poirier <mathieu.poirier@...aro.org>
To: Sai Prakash Ranjan <saiprakash.ranjan@...eaurora.org>
Cc: Suzuki K Poulose <suzuki.poulose@....com>,
Rob Herring <robh+dt@...nel.org>, devicetree@...r.kernel.org,
Leo Yan <leo.yan@...aro.org>,
Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
David Brown <david.brown@...aro.org>,
Mark Rutland <mark.rutland@....com>,
Rajendra Nayak <rnayak@...eaurora.org>,
Vivek Gautam <vivek.gautam@...eaurora.org>,
Sibi Sankar <sibis@...eaurora.org>,
linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
linux-arm-msm <linux-arm-msm@...r.kernel.org>
Subject: Re: [PATCHv5 2/2] coresight: Do not default to CPU0 for missing CPU phandle
On Thu, 27 Jun 2019 at 12:16, Sai Prakash Ranjan
<saiprakash.ranjan@...eaurora.org> wrote:
>
> Coresight platform support assumes that a missing "cpu" phandle
> defaults to CPU0. This could be problematic and unnecessarily binds
> components to CPU0, where they may not be. In coresight etm and
> cpu-debug drivers, abort the probe for such cases.
>
> Signed-off-by: Sai Prakash Ranjan <saiprakash.ranjan@...eaurora.org>
> Reviewed-by: Suzuki K Poulose <suzuki.poulose@....com>
Same with this one:
Tested-by: Mathieu Poirier <mathieu.poirier@...aro.org>
Reviewed-by: Mathieu Poirier <mathieu.poirier@...aro.org>
> ---
> .../hwtracing/coresight/coresight-cpu-debug.c | 3 +++
> drivers/hwtracing/coresight/coresight-etm3x.c | 3 +++
> drivers/hwtracing/coresight/coresight-etm4x.c | 3 +++
> .../hwtracing/coresight/coresight-platform.c | 20 +++++++++----------
> 4 files changed, 19 insertions(+), 10 deletions(-)
>
> diff --git a/drivers/hwtracing/coresight/coresight-cpu-debug.c b/drivers/hwtracing/coresight/coresight-cpu-debug.c
> index 07a1367c733f..58bfd6319f65 100644
> --- a/drivers/hwtracing/coresight/coresight-cpu-debug.c
> +++ b/drivers/hwtracing/coresight/coresight-cpu-debug.c
> @@ -579,6 +579,9 @@ static int debug_probe(struct amba_device *adev, const struct amba_id *id)
> return -ENOMEM;
>
> drvdata->cpu = coresight_get_cpu(dev);
> + if (drvdata->cpu < 0)
> + return drvdata->cpu;
> +
> if (per_cpu(debug_drvdata, drvdata->cpu)) {
> dev_err(dev, "CPU%d drvdata has already been initialized\n",
> drvdata->cpu);
> diff --git a/drivers/hwtracing/coresight/coresight-etm3x.c b/drivers/hwtracing/coresight/coresight-etm3x.c
> index 225c2982e4fe..e2cb6873c3f2 100644
> --- a/drivers/hwtracing/coresight/coresight-etm3x.c
> +++ b/drivers/hwtracing/coresight/coresight-etm3x.c
> @@ -816,6 +816,9 @@ static int etm_probe(struct amba_device *adev, const struct amba_id *id)
> }
>
> drvdata->cpu = coresight_get_cpu(dev);
> + if (drvdata->cpu < 0)
> + return drvdata->cpu;
> +
> desc.name = devm_kasprintf(dev, GFP_KERNEL, "etm%d", drvdata->cpu);
> if (!desc.name)
> return -ENOMEM;
> diff --git a/drivers/hwtracing/coresight/coresight-etm4x.c b/drivers/hwtracing/coresight/coresight-etm4x.c
> index 7fe266194ab5..7bcac8896fc1 100644
> --- a/drivers/hwtracing/coresight/coresight-etm4x.c
> +++ b/drivers/hwtracing/coresight/coresight-etm4x.c
> @@ -1101,6 +1101,9 @@ static int etm4_probe(struct amba_device *adev, const struct amba_id *id)
> spin_lock_init(&drvdata->spinlock);
>
> drvdata->cpu = coresight_get_cpu(dev);
> + if (drvdata->cpu < 0)
> + return drvdata->cpu;
> +
> desc.name = devm_kasprintf(dev, GFP_KERNEL, "etm%d", drvdata->cpu);
> if (!desc.name)
> return -ENOMEM;
> diff --git a/drivers/hwtracing/coresight/coresight-platform.c b/drivers/hwtracing/coresight/coresight-platform.c
> index 3c5ceda8db24..cf580ffbc27c 100644
> --- a/drivers/hwtracing/coresight/coresight-platform.c
> +++ b/drivers/hwtracing/coresight/coresight-platform.c
> @@ -159,16 +159,16 @@ static int of_coresight_get_cpu(struct device *dev)
> struct device_node *dn;
>
> if (!dev->of_node)
> - return 0;
> + return -ENODEV;
> +
> dn = of_parse_phandle(dev->of_node, "cpu", 0);
> - /* Affinity defaults to CPU0 */
> if (!dn)
> - return 0;
> + return -ENODEV;
> +
> cpu = of_cpu_node_to_id(dn);
> of_node_put(dn);
>
> - /* Affinity to CPU0 if no cpu nodes are found */
> - return (cpu < 0) ? 0 : cpu;
> + return cpu;
> }
>
> /*
> @@ -310,7 +310,7 @@ of_get_coresight_platform_data(struct device *dev,
>
> static inline int of_coresight_get_cpu(struct device *dev)
> {
> - return 0;
> + return -ENODEV;
> }
> #endif
>
> @@ -734,14 +734,14 @@ static int acpi_coresight_get_cpu(struct device *dev)
> struct acpi_device *adev = ACPI_COMPANION(dev);
>
> if (!adev)
> - return 0;
> + return -ENODEV;
> status = acpi_get_parent(adev->handle, &cpu_handle);
> if (ACPI_FAILURE(status))
> - return 0;
> + return -ENODEV;
>
> cpu = acpi_handle_to_logical_cpuid(cpu_handle);
> if (cpu >= nr_cpu_ids)
> - return 0;
> + return -ENODEV;
> return cpu;
> }
>
> @@ -769,7 +769,7 @@ acpi_get_coresight_platform_data(struct device *dev,
>
> static inline int acpi_coresight_get_cpu(struct device *dev)
> {
> - return 0;
> + return -ENODEV;
> }
> #endif
>
> --
> QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member
> of Code Aurora Forum, hosted by The Linux Foundation
>
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