linux-kernel - Re: [PATCH 2/2] platform/mellanox: mlxbf-pmc: Ignore unsupported performance blocks

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Message-ID: <3a641698-a0eb-4335-932a-2f0ae73dab44@redhat.com>
Date: Mon, 26 Feb 2024 11:49:47 +0100
From: Hans de Goede <hdegoede@...hat.com>
To: Luiz Capitulino <luizcap@...hat.com>, ilpo.jarvinen@...ux.intel.com,
 shravankr@...dia.com
Cc: davthompson@...dia.com, ndalvi@...hat.com, linux-kernel@...r.kernel.org,
 platform-driver-x86@...r.kernel.org
Subject: Re: [PATCH 2/2] platform/mellanox: mlxbf-pmc: Ignore unsupported
 performance blocks

Hi,

On 2/22/24 21:57, Luiz Capitulino wrote:
> Currently, the driver has two behaviors to deal with new & unsupported
> performance blocks reported by the firmware:
> 
>  1. For register and unknown block types, the driver will fail to load
>     with the following error message:
> 
>     [ 4510.956369] mlxbf-pmc: probe of MLNXBFD2:00 failed with error -22
> 
>  2. For counter and crspace blocks, the driver will load and sysfs files
>     will be created but getting the contents of event_list or trying to
>     setup the counter will fail
> 
> Instead, let's ignore and log unsupported blocks. This means the driver
> will always load and unsupported blocks will never show up in sysfs.
> 
> Signed-off-by: Luiz Capitulino <luizcap@...hat.com>

Thanks, patch looks good to me:

Reviewed-by: Hans de Goede <hdegoede@...hat.com>

Regards,

Hans



> ---
>  drivers/platform/mellanox/mlxbf-pmc.c | 16 ++++++++++++++--
>  1 file changed, 14 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/platform/mellanox/mlxbf-pmc.c b/drivers/platform/mellanox/mlxbf-pmc.c
> index b71636eb3db1..746567767e5b 100644
> --- a/drivers/platform/mellanox/mlxbf-pmc.c
> +++ b/drivers/platform/mellanox/mlxbf-pmc.c
> @@ -1043,6 +1043,11 @@ static const struct mlxbf_pmc_events *mlxbf_pmc_event_list(const char *blk, size
>  	return events;
>  }
>  
> +static bool mlxbf_pmc_event_supported(const char *blk)
> +{
> +	return !!mlxbf_pmc_event_list(blk, NULL);
> +}
> +
>  /* Get the event number given the name */
>  static int mlxbf_pmc_get_event_num(const char *blk, const char *evt)
>  {
> @@ -1761,6 +1766,9 @@ static int mlxbf_pmc_init_perftype_counter(struct device *dev, unsigned int blk_
>  	struct mlxbf_pmc_attribute *attr;
>  	unsigned int i = 0, j = 0;
>  
> +	if (!mlxbf_pmc_event_supported(pmc->block_name[blk_num]))
> +		return -ENOENT;
> +
>  	/* "event_list" sysfs to list events supported by the block */
>  	attr = &pmc->block[blk_num].attr_event_list;
>  	attr->dev_attr.attr.mode = 0444;
> @@ -1840,7 +1848,7 @@ static int mlxbf_pmc_init_perftype_reg(struct device *dev, unsigned int blk_num)
>  
>  	events = mlxbf_pmc_event_list(pmc->block_name[blk_num], &count);
>  	if (!events)
> -		return -EINVAL;
> +		return -ENOENT;
>  
>  	pmc->block[blk_num].attr_event = devm_kcalloc(
>  		dev, count, sizeof(struct mlxbf_pmc_attribute), GFP_KERNEL);
> @@ -1878,7 +1886,7 @@ static int mlxbf_pmc_create_groups(struct device *dev, unsigned int blk_num)
>  	else if (pmc->block[blk_num].type == MLXBF_PMC_TYPE_REGISTER)
>  		err = mlxbf_pmc_init_perftype_reg(dev, blk_num);
>  	else
> -		err = -EINVAL;
> +		err = -ENOENT;
>  
>  	if (err)
>  		return err;
> @@ -1983,6 +1991,10 @@ static int mlxbf_pmc_map_counters(struct device *dev)
>  			return -ENOMEM;
>  
>  		ret = mlxbf_pmc_create_groups(dev, i);
> +		if (ret == -ENOENT) {
> +			dev_warn(dev, "ignoring unsupported block: '%s'\n", pmc->block_name[i]);
> +			continue;
> +		}
>  		if (ret)
>  			return ret;
>  	}