linux-kernel - Re: [PATCH 1/1] platform/x86/intel/pmc: Show live substate requirements

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Message-ID: <edfd1b36-7532-c0ba-6d24-b3e296e1cf0b@linux.intel.com>
Date: Mon, 29 Jul 2024 14:38:57 +0300 (EEST)
From: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
To: Kane Chen <kane.chen@...el.com>
cc: LKML <linux-kernel@...r.kernel.org>, platform-driver-x86@...r.kernel.org
Subject: Re: [PATCH 1/1] platform/x86/intel/pmc: Show live substate
 requirements

On Fri, 19 Jul 2024, Kane Chen wrote:

> While debugging runtime s0ix, we do need to check which required IPs
> are not power gated. This patch adds code to show live substate status
> vs requirements in sys/kernel/debug/pmc_core/substate_requirements to
> help runtime s0ix debug.
> 
> Signed-off-by: Kane Chen <kane.chen@...el.com>

Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>

-- 
 i.

> ---
>  drivers/platform/x86/intel/pmc/core.c | 12 +++++++++++-
>  1 file changed, 11 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/platform/x86/intel/pmc/core.c b/drivers/platform/x86/intel/pmc/core.c
> index 2ad2f8753e5d4..b93ecc5169745 100644
> --- a/drivers/platform/x86/intel/pmc/core.c
> +++ b/drivers/platform/x86/intel/pmc/core.c
> @@ -791,13 +791,15 @@ static void pmc_core_substate_req_header_show(struct seq_file *s, int pmc_index)
>  	pmc_for_each_mode(i, mode, pmcdev)
>  		seq_printf(s, " %9s |", pmc_lpm_modes[mode]);
>  
> -	seq_printf(s, " %9s |\n", "Status");
> +	seq_printf(s, " %9s |", "Status");
> +	seq_printf(s, " %11s |\n", "Live Status");
>  }
>  
>  static int pmc_core_substate_req_regs_show(struct seq_file *s, void *unused)
>  {
>  	struct pmc_dev *pmcdev = s->private;
>  	u32 sts_offset;
> +	u32 sts_offset_live;
>  	u32 *lpm_req_regs;
>  	int num_maps, mp, pmc_index;
>  
> @@ -811,6 +813,7 @@ static int pmc_core_substate_req_regs_show(struct seq_file *s, void *unused)
>  		maps = pmc->map->lpm_sts;
>  		num_maps = pmc->map->lpm_num_maps;
>  		sts_offset = pmc->map->lpm_status_offset;
> +		sts_offset_live = pmc->map->lpm_live_status_offset;
>  		lpm_req_regs = pmc->lpm_req_regs;
>  
>  		/*
> @@ -828,6 +831,7 @@ static int pmc_core_substate_req_regs_show(struct seq_file *s, void *unused)
>  		for (mp = 0; mp < num_maps; mp++) {
>  			u32 req_mask = 0;
>  			u32 lpm_status;
> +			u32 lpm_status_live;
>  			const struct pmc_bit_map *map;
>  			int mode, idx, i, len = 32;
>  
> @@ -842,6 +846,9 @@ static int pmc_core_substate_req_regs_show(struct seq_file *s, void *unused)
>  			/* Get the last latched status for this map */
>  			lpm_status = pmc_core_reg_read(pmc, sts_offset + (mp * 4));
>  
> +			/* Get the runtime status for this map */
> +			lpm_status_live = pmc_core_reg_read(pmc, sts_offset_live + (mp * 4));
> +
>  			/*  Loop over elements in this map */
>  			map = maps[mp];
>  			for (i = 0; map[i].name && i < len; i++) {
> @@ -868,6 +875,9 @@ static int pmc_core_substate_req_regs_show(struct seq_file *s, void *unused)
>  				/* In Status column, show the last captured state of this agent */
>  				seq_printf(s, " %9s |", lpm_status & bit_mask ? "Yes" : " ");
>  
> +				/* In Live status column, show the live state of this agent */
> +				seq_printf(s, " %11s |", lpm_status_live & bit_mask ? "Yes" : " ");
> +
>  				seq_puts(s, "\n");
>  			}
>  		}
>