linux-kernel - Re: [PATCH 1/2] platform/mellanox: mlxbf-pmc: mlxbf_pmc_event

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Date: Mon, 26 Feb 2024 11:49:33 +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 1/2] platform/mellanox: mlxbf-pmc: mlxbf_pmc_event_list():
 make size ptr optional

Hi,

On 2/22/24 21:57, Luiz Capitulino wrote:
> The mlxbf_pmc_event_list() function returns a pointer to an array of
> supported events and the array size. The array size is returned via
> a pointer passed as an argument, which is mandatory.
> 
> However, we want to be able to use mlxbf_pmc_event_list() just to check
> if a block name is implemented/supported. For this usage passing the size
> argument is not necessary so let's make it optional.
> 
> 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 | 40 +++++++++++++++------------
>  1 file changed, 22 insertions(+), 18 deletions(-)
> 
> diff --git a/drivers/platform/mellanox/mlxbf-pmc.c b/drivers/platform/mellanox/mlxbf-pmc.c
> index 250405bb59a7..b71636eb3db1 100644
> --- a/drivers/platform/mellanox/mlxbf-pmc.c
> +++ b/drivers/platform/mellanox/mlxbf-pmc.c
> @@ -966,32 +966,33 @@ static bool mlxbf_pmc_valid_range(unsigned int blk_num, u32 offset)
>  }
>  
>  /* Get the event list corresponding to a certain block */
> -static const struct mlxbf_pmc_events *mlxbf_pmc_event_list(const char *blk, size_t *size)
> +static const struct mlxbf_pmc_events *mlxbf_pmc_event_list(const char *blk, size_t *psize)
>  {
>  	const struct mlxbf_pmc_events *events;
> +	size_t size;
>  
>  	if (strstr(blk, "tilenet")) {
>  		events = mlxbf_pmc_hnfnet_events;
> -		*size = ARRAY_SIZE(mlxbf_pmc_hnfnet_events);
> +		size = ARRAY_SIZE(mlxbf_pmc_hnfnet_events);
>  	} else if (strstr(blk, "tile")) {
>  		events = mlxbf_pmc_hnf_events;
> -		*size = ARRAY_SIZE(mlxbf_pmc_hnf_events);
> +		size = ARRAY_SIZE(mlxbf_pmc_hnf_events);
>  	} else if (strstr(blk, "triogen")) {
>  		events = mlxbf_pmc_smgen_events;
> -		*size = ARRAY_SIZE(mlxbf_pmc_smgen_events);
> +		size = ARRAY_SIZE(mlxbf_pmc_smgen_events);
>  	} else if (strstr(blk, "trio")) {
>  		switch (pmc->event_set) {
>  		case MLXBF_PMC_EVENT_SET_BF1:
>  			events = mlxbf_pmc_trio_events_1;
> -			*size = ARRAY_SIZE(mlxbf_pmc_trio_events_1);
> +			size = ARRAY_SIZE(mlxbf_pmc_trio_events_1);
>  			break;
>  		case MLXBF_PMC_EVENT_SET_BF2:
>  			events = mlxbf_pmc_trio_events_2;
> -			*size = ARRAY_SIZE(mlxbf_pmc_trio_events_2);
> +			size = ARRAY_SIZE(mlxbf_pmc_trio_events_2);
>  			break;
>  		default:
>  			events = NULL;
> -			*size = 0;
> +			size = 0;
>  			break;
>  		}
>  	} else if (strstr(blk, "mss")) {
> @@ -999,43 +1000,46 @@ static const struct mlxbf_pmc_events *mlxbf_pmc_event_list(const char *blk, size
>  		case MLXBF_PMC_EVENT_SET_BF1:
>  		case MLXBF_PMC_EVENT_SET_BF2:
>  			events = mlxbf_pmc_mss_events_1;
> -			*size = ARRAY_SIZE(mlxbf_pmc_mss_events_1);
> +			size = ARRAY_SIZE(mlxbf_pmc_mss_events_1);
>  			break;
>  		case MLXBF_PMC_EVENT_SET_BF3:
>  			events = mlxbf_pmc_mss_events_3;
> -			*size = ARRAY_SIZE(mlxbf_pmc_mss_events_3);
> +			size = ARRAY_SIZE(mlxbf_pmc_mss_events_3);
>  			break;
>  		default:
>  			events = NULL;
> -			*size = 0;
> +			size = 0;
>  			break;
>  		}
>  	} else if (strstr(blk, "ecc")) {
>  		events = mlxbf_pmc_ecc_events;
> -		*size = ARRAY_SIZE(mlxbf_pmc_ecc_events);
> +		size = ARRAY_SIZE(mlxbf_pmc_ecc_events);
>  	} else if (strstr(blk, "pcie")) {
>  		events = mlxbf_pmc_pcie_events;
> -		*size = ARRAY_SIZE(mlxbf_pmc_pcie_events);
> +		size = ARRAY_SIZE(mlxbf_pmc_pcie_events);
>  	} else if (strstr(blk, "l3cache")) {
>  		events = mlxbf_pmc_l3c_events;
> -		*size = ARRAY_SIZE(mlxbf_pmc_l3c_events);
> +		size = ARRAY_SIZE(mlxbf_pmc_l3c_events);
>  	} else if (strstr(blk, "gic")) {
>  		events = mlxbf_pmc_smgen_events;
> -		*size = ARRAY_SIZE(mlxbf_pmc_smgen_events);
> +		size = ARRAY_SIZE(mlxbf_pmc_smgen_events);
>  	} else if (strstr(blk, "smmu")) {
>  		events = mlxbf_pmc_smgen_events;
> -		*size = ARRAY_SIZE(mlxbf_pmc_smgen_events);
> +		size = ARRAY_SIZE(mlxbf_pmc_smgen_events);
>  	} else if (strstr(blk, "llt_miss")) {
>  		events = mlxbf_pmc_llt_miss_events;
> -		*size = ARRAY_SIZE(mlxbf_pmc_llt_miss_events);
> +		size = ARRAY_SIZE(mlxbf_pmc_llt_miss_events);
>  	} else if (strstr(blk, "llt")) {
>  		events = mlxbf_pmc_llt_events;
> -		*size = ARRAY_SIZE(mlxbf_pmc_llt_events);
> +		size = ARRAY_SIZE(mlxbf_pmc_llt_events);
>  	} else {
>  		events = NULL;
> -		*size = 0;
> +		size = 0;
>  	}
>  
> +	if (psize)
> +		*psize = size;
> +
>  	return events;
>  }
>