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SubjectRe: [PATCH V3 4/4] coresight: trbe: Enable ACPI based TRBE devices
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On 07/08/2023 05:43, Anshuman Khandual wrote:
>
>
> On 8/3/23 11:26, Anshuman Khandual wrote:
>> This detects and enables ACPI based TRBE devices via the dummy platform
>> device created earlier for this purpose.
>>
>> Cc: Suzuki K Poulose <suzuki.poulose@arm.com>
>> Cc: Mike Leach <mike.leach@linaro.org>
>> Cc: Leo Yan <leo.yan@linaro.org>
>> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
>> Cc: coresight@lists.linaro.org
>> Cc: linux-arm-kernel@lists.infradead.org
>> Cc: linux-kernel@vger.kernel.org
>> Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>
>> ---
>> drivers/hwtracing/coresight/coresight-trbe.c | 9 +++++++++
>> drivers/hwtracing/coresight/coresight-trbe.h | 1 +
>> 2 files changed, 10 insertions(+)
>>
>> diff --git a/drivers/hwtracing/coresight/coresight-trbe.c b/drivers/hwtracing/coresight/coresight-trbe.c
>> index e1d9d06e7725..f884883e9018 100644
>> --- a/drivers/hwtracing/coresight/coresight-trbe.c
>> +++ b/drivers/hwtracing/coresight/coresight-trbe.c
>> @@ -1537,7 +1537,16 @@ static const struct of_device_id arm_trbe_of_match[] = {
>> };
>> MODULE_DEVICE_TABLE(of, arm_trbe_of_match);
>>
>> +#ifdef CONFIG_ACPI
>> +static const struct platform_device_id arm_trbe_acpi_match[] = {
>> + { ARMV8_TRBE_PDEV_NAME, 0 },
>> + { }
>> +};
>> +MODULE_DEVICE_TABLE(platform, arm_trbe_acpi_match);
>> +#endif
>> +
>> static struct platform_driver arm_trbe_driver = {
>> + .id_table = arm_trbe_acpi_match,
>
> The build problem [1] reported on the first version of the series still exists
> here i.e arm_trbe_acpi_match is hidden without CONFIG_ACPI. I had assumed that
> CONFIG_CORESIGHT always enables CONFIG_ACPI, which is not the case. Following
> random config (with CONFIG_ACPI=n and CONFIG_CORESIGHT_TRBE=y) easily triggers
> the build problem.
>
> https://download.01.org/0day-ci/archive/20230805/202308052123.uqR35d19-lkp@intel.com/config
>
> make CROSS_COMPILE=aarch64-linux-gnu- ARCH=arm64 -s -j 128
> drivers/hwtracing/coresight/coresight-trbe.c:1563:23: error: implicit declaration of function ‘ACPI_PTR’ [-Werror=implicit-function-declaration]
> 1563 | .acpi_match_table = ACPI_PTR(arm_trbe_acpi_match),
> | ^~~~~~~~
> drivers/hwtracing/coresight/coresight-trbe.c:1563:32: error: ‘arm_trbe_acpi_match’ undeclared here (not in a function); did you mean ‘arm_trbe_of_match’?
> 1563 | .acpi_match_table = ACPI_PTR(arm_trbe_acpi_match),
> | ^~~~~~~~~~~~~~~~~~~
> | arm_trbe_of_match
>
> Following config wrap around fixes the problem.
>
> --- a/drivers/hwtracing/coresight/coresight-trbe.c
> +++ b/drivers/hwtracing/coresight/coresight-trbe.c
> @@ -1557,7 +1557,9 @@ MODULE_DEVICE_TABLE(platform, arm_trbe_acpi_match);
> #endif
>
> static struct platform_driver arm_trbe_driver = {
> +#ifdef CONFIG_ACPI
> .id_table = arm_trbe_acpi_match,
> +#endif
> .driver = {
> .name = DRVNAME,
> .of_match_table = of_match_ptr(arm_trbe_of_match),
>
> Please not that unlike other coresight drivers, TRBE is not using 'acpi_device_id'
> based "acpi_match_table = ACPI_PTR" construct. But regardless, ACPI_PTR() seems to
> be an alternate (probably better) solution as well.
>
> --- a/drivers/hwtracing/coresight/coresight-trbe.c
> +++ b/drivers/hwtracing/coresight/coresight-trbe.c
> @@ -1557,7 +1557,7 @@ MODULE_DEVICE_TABLE(platform, arm_trbe_acpi_match);
> #endif
>
> static struct platform_driver arm_trbe_driver = {
> - .id_table = arm_trbe_acpi_match,
> + .id_table = ACPI_PTR(arm_trbe_acpi_match),

This is preferred.

> .driver = {
> .name = DRVNAME,
> .of_match_table = of_match_ptr(arm_trbe_of_match),
> diff --git a/drivers/hwtracing/coresight/coresight-trbe.h b/drivers/hwtracing/coresight/coresight-trbe.h
> index 94e67009848a..fce1735d5c58 100644
> --- a/drivers/hwtracing/coresight/coresight-trbe.h
> +++ b/drivers/hwtracing/coresight/coresight-trbe.h
> @@ -7,6 +7,7 @@
> *
> * Author: Anshuman Khandual <anshuman.khandual@arm.com>
> */
> +#include <linux/acpi.h>

Shouldn't this be added in trbe.c ? Does trbe.h depend on any ACPI headers ?

Suzuki

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