Re: [PATCH V4 13/17] platform/x86/intel/pmc: Display LPM requirements for multiple PMCs

["Ilpo Järvinen" <ilpo.jarvinen@linux.intel.com>]

On Wed, 18 Oct 2023, David E. Box wrote:

> From: Rajvi Jingar <rajvi.jingar@linux.intel.com>
> 
> Update the substate_requirements attribute to display the requirements for
> all the PMCs on a package.
> 
> Signed-off-by: Rajvi Jingar <rajvi.jingar@linux.intel.com>
> Signed-off-by: David E. Box <david.e.box@linux.intel.com>
> ---
> V4 - No change
> 
> V3 - Add missing submitter signoff
> 
> V2 - no change
> 
>  drivers/platform/x86/intel/pmc/core.c | 129 ++++++++++++++------------
>  1 file changed, 71 insertions(+), 58 deletions(-)
> 
> diff --git a/drivers/platform/x86/intel/pmc/core.c b/drivers/platform/x86/intel/pmc/core.c
> index 3894119d61b0..fcb0dc702aea 100644
> --- a/drivers/platform/x86/intel/pmc/core.c
> +++ b/drivers/platform/x86/intel/pmc/core.c
> @@ -728,7 +728,7 @@ static int pmc_core_substate_l_sts_regs_show(struct seq_file *s, void *unused)
>  }
>  DEFINE_SHOW_ATTRIBUTE(pmc_core_substate_l_sts_regs);
>  
> -static void pmc_core_substate_req_header_show(struct seq_file *s)
> +static void pmc_core_substate_req_header_show(struct seq_file *s, int pmc_index)
>  {
>  	struct pmc_dev *pmcdev = s->private;
>  	int i, mode;
> @@ -743,68 +743,81 @@ static void pmc_core_substate_req_header_show(struct seq_file *s)
>  static int pmc_core_substate_req_regs_show(struct seq_file *s, void *unused)
>  {
>  	struct pmc_dev *pmcdev = s->private;
> -	struct pmc *pmc = pmcdev->pmcs[PMC_IDX_MAIN];
> -	const struct pmc_bit_map **maps = pmc->map->lpm_sts;
> -	const struct pmc_bit_map *map;
> -	const int num_maps = pmc->map->lpm_num_maps;
> -	u32 sts_offset = pmc->map->lpm_status_offset;
> -	u32 *lpm_req_regs = pmc->lpm_req_regs;
> -	int mp;
> -
> -	/* Display the header */
> -	pmc_core_substate_req_header_show(s);
> -
> -	/* Loop over maps */
> -	for (mp = 0; mp < num_maps; mp++) {
> -		u32 req_mask = 0;
> -		u32 lpm_status;
> -		int mode, idx, i, len = 32;
> -
> -		/*
> -		 * Capture the requirements and create a mask so that we only
> -		 * show an element if it's required for at least one of the
> -		 * enabled low power modes
> -		 */
> -		pmc_for_each_mode(idx, mode, pmcdev)
> -			req_mask |= lpm_req_regs[mp + (mode * num_maps)];
> -
> -		/* Get the last latched status for this map */
> -		lpm_status = pmc_core_reg_read(pmc, sts_offset + (mp * 4));
> -
> -		/*  Loop over elements in this map */
> -		map = maps[mp];
> -		for (i = 0; map[i].name && i < len; i++) {
> -			u32 bit_mask = map[i].bit_mask;
> -
> -			if (!(bit_mask & req_mask))
> -				/*
> -				 * Not required for any enabled states
> -				 * so don't display
> -				 */
> -				continue;
> -
> -			/* Display the element name in the first column */
> -			seq_printf(s, "%30s |", map[i].name);
> -
> -			/* Loop over the enabled states and display if required */
> -			pmc_for_each_mode(idx, mode, pmcdev) {
> -				if (lpm_req_regs[mp + (mode * num_maps)] & bit_mask)
> -					seq_printf(s, " %9s |",
> -						   "Required");
> +	u32 sts_offset;
> +	u32 *lpm_req_regs;
> +	int num_maps, mp, pmc_index;
> +
> +	for (pmc_index = 0; pmc_index < ARRAY_SIZE(pmcdev->pmcs); ++pmc_index) {
> +		struct pmc *pmc = pmcdev->pmcs[pmc_index];
> +		const struct pmc_bit_map **maps;
> +
> +		if (!pmc)
> +			continue;
> +
> +		maps = pmc->map->lpm_sts;
> +		num_maps = pmc->map->lpm_num_maps;
> +		sts_offset = pmc->map->lpm_status_offset;
> +		lpm_req_regs = pmc->lpm_req_regs;
> +
> +		if (!lpm_req_regs)
> +			continue;
> +
> +		/* Display the header */
> +		pmc_core_substate_req_header_show(s, pmc_index);
> +
> +		/* Loop over maps */
> +		for (mp = 0; mp < num_maps; mp++) {
> +			u32 req_mask = 0;
> +			u32 lpm_status;
> +			const struct pmc_bit_map *map;
> +			int mode, idx, i, len = 32;
> +
> +			/*
> +			 * Capture the requirements and create a mask so that we only
> +			 * show an element if it's required for at least one of the
> +			 * enabled low power modes
> +			 */
> +			pmc_for_each_mode(idx, mode, pmcdev)
> +				req_mask |= lpm_req_regs[mp + (mode * num_maps)];
> +
> +			/* Get the last latched status for this map */
> +			lpm_status = pmc_core_reg_read(pmc, sts_offset + (mp * 4));
> +
> +			/*  Loop over elements in this map */
> +			map = maps[mp];
> +			for (i = 0; map[i].name && i < len; i++) {
> +				u32 bit_mask = map[i].bit_mask;
> +
> +				if (!(bit_mask & req_mask)) {
> +					/*
> +					 * Not required for any enabled states
> +					 * so don't display
> +					 */
> +					continue;
> +				}
> +
> +				/* Display the element name in the first column */
> +				seq_printf(s, "pmc%d: %26s |", pmc_index, map[i].name);
> +
> +				/* Loop over the enabled states and display if required */
> +				pmc_for_each_mode(idx, mode, pmcdev) {
> +					if (lpm_req_regs[mp + (mode * num_maps)] & bit_mask)
> +						seq_printf(s, " %9s |",
> +							   "Required");
> +					else
> +						seq_printf(s, " %9s |", " ");

It would be better to not branch like this but alter param instead:

					bool required = lpm_req_regs[...

					seq_printf(s, " %9s |",
						   required ? "Required" : " ");

> +				}
> +
> +				/* In Status column, show the last captured state of this agent */
> +				if (lpm_status & bit_mask)
> +					seq_printf(s, " %9s |", "Yes");
>  				else
>  					seq_printf(s, " %9s |", " ");

Likewise here although I know this comes from the original.

-- 
 i.


> +
> +				seq_puts(s, "\n");
>  			}
> -
> -			/* In Status column, show the last captured state of this agent */
> -			if (lpm_status & bit_mask)
> -				seq_printf(s, " %9s |", "Yes");
> -			else
> -				seq_printf(s, " %9s |", " ");
> -
> -			seq_puts(s, "\n");
>  		}
>  	}
> -
>  	return 0;
>  }
>  DEFINE_SHOW_ATTRIBUTE(pmc_core_substate_req_regs);
>