On Wed, 17 Apr 2024, Shravan Kumar Ramani wrote:
> Add support for programming any counter to monitor the cycle count.
> Since counting of cycles using 32-bit ocunters would result in frequent
> wraparounds, add the ability to combine 2 adjacent 32-bit counters to
> form 1 64-bit counter.
> Both these features are supported by BlueField-3 PMC hardware, hence
> the required bit-fields are exposed by the driver via sysfs to allow
> the user to configure as needed.
>
> Signed-off-by: Shravan Kumar Ramani <shravankr@xxxxxxxxxx>
> Reviewed-by: David Thompson <davthompson@xxxxxxxxxx>
> Reviewed-by: Vadim Pasternak <vadimp@xxxxxxxxxx>
> ---
> @@ -1799,6 +1902,37 @@ static int mlxbf_pmc_init_perftype_counter(struct device *dev, unsigned int blk_
> attr = NULL;
> }
>
> + if (pmc->block[blk_num].type == MLXBF_PMC_TYPE_CRSPACE) {
> + /*
> + * Couple adjacent odd and even 32-bit counters to form 64-bit counters
> + * using "use_odd_counter" sysfs which has one bit per even counter.
> + */
> + attr = &pmc->block[blk_num].attr_use_odd_counter;
> + attr->dev_attr.attr.mode = 0644;
> + attr->dev_attr.show = mlxbf_pmc_use_odd_counter_show;
> + attr->dev_attr.store = mlxbf_pmc_use_odd_counter_store;
> + attr->nr = blk_num;
> + attr->dev_attr.attr.name = devm_kasprintf(dev, GFP_KERNEL,
> + "use_odd_counter");
> + if (!attr->dev_attr.attr.name)
> + return -ENOMEM;
> + pmc->block[blk_num].block_attr[++i] = &attr->dev_attr.attr;
> + attr = NULL;
> +
> + /* Program crspace counters to count clock cycles using "count_clock" sysfs */
> + attr = &pmc->block[blk_num].attr_count_clock;
> + attr->dev_attr.attr.mode = 0644;
> + attr->dev_attr.show = mlxbf_pmc_count_clock_show;
> + attr->dev_attr.store = mlxbf_pmc_count_clock_store;
> + attr->nr = blk_num;
> + attr->dev_attr.attr.name = devm_kasprintf(dev, GFP_KERNEL,
> + "count_clock");
> + if (!attr->dev_attr.attr.name)
> + return -ENOMEM;
> + pmc->block[blk_num].block_attr[++i] = &attr->dev_attr.attr;
> + attr = NULL;
> + }
Hi,
What was the reason why this driver could not use .dev_groups to setup
sysfs (filtering can be done with .is_visible)?
--
i.
