linux-kernel - Re: [PATCH 6/9] platform/x86: intel_pmc_core: Add requirements file to debugfs

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Date:   Wed, 7 Apr 2021 16:28:13 +0200
From:   Hans de Goede <hdegoede@...hat.com>
To:     "David E. Box" <david.e.box@...ux.intel.com>,
        irenic.rajneesh@...il.com, mgross@...ux.intel.com,
        gayatri.kammela@...el.com
Cc:     platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 6/9] platform/x86: intel_pmc_core: Add requirements file
 to debugfs

Hi,

On 4/1/21 5:05 AM, David E. Box wrote:
> From: Gayatri Kammela <gayatri.kammela@...el.com>
> 
> Add the debugfs file, substate_requirements, to view the low power mode
> (LPM) requirements for each enabled mode alongside the last latched status
> of the condition.
> 
> After this patch, the new file will look like this:
> 
>                     Element |    S0i2.0 |    S0i3.0 |    S0i2.1 |    S0i3.1 |    S0i3.2 |    Status |
>             USB2PLL_OFF_STS |  Required |  Required |  Required |  Required |  Required |           |
> PCIe/USB3.1_Gen2PLL_OFF_STS |  Required |  Required |  Required |  Required |  Required |           |
>        PCIe_Gen3PLL_OFF_STS |  Required |  Required |  Required |  Required |  Required |       Yes |
>             OPIOPLL_OFF_STS |  Required |  Required |  Required |  Required |  Required |       Yes |
>               OCPLL_OFF_STS |  Required |  Required |  Required |  Required |  Required |       Yes |
>             MainPLL_OFF_STS |           |  Required |           |  Required |  Required |           |
> 
> Signed-off-by: Gayatri Kammela <gayatri.kammela@...el.com>
> Co-developed-by: David E. Box <david.e.box@...ux.intel.com>
> Signed-off-by: David E. Box <david.e.box@...ux.intel.com>

Thanks, patch looks good to me:

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

Regards,

Hans

> ---
>  drivers/platform/x86/intel_pmc_core.c | 86 +++++++++++++++++++++++++++
>  1 file changed, 86 insertions(+)
> 
> diff --git a/drivers/platform/x86/intel_pmc_core.c b/drivers/platform/x86/intel_pmc_core.c
> index 0ec26a4c715e..0b47a1da5f49 100644
> --- a/drivers/platform/x86/intel_pmc_core.c
> +++ b/drivers/platform/x86/intel_pmc_core.c
> @@ -1122,6 +1122,86 @@ 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)
> +{
> +	struct pmc_dev *pmcdev = s->private;
> +	int i, mode;
> +
> +	seq_printf(s, "%30s |", "Element");
> +	pmc_for_each_mode(i, mode, pmcdev)
> +		seq_printf(s, " %9s |", pmc_lpm_modes[mode]);
> +
> +	seq_printf(s, " %9s |\n", "Status");
> +}
> +
> +static int pmc_core_substate_req_regs_show(struct seq_file *s, void *unused)
> +{
> +	struct pmc_dev *pmcdev = s->private;
> +	const struct pmc_bit_map **maps = pmcdev->map->lpm_sts;
> +	const struct pmc_bit_map *map;
> +	const int num_maps = pmcdev->map->lpm_num_maps;
> +	u32 sts_offset = pmcdev->map->lpm_status_offset;
> +	u32 *lpm_req_regs = pmcdev->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(pmcdev, 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");
> +				else
> +					seq_printf(s, " %9s |", " ");
> +			}
> +
> +			/* 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);
> +
>  static int pmc_core_pkgc_show(struct seq_file *s, void *unused)
>  {
>  	struct pmc_dev *pmcdev = s->private;
> @@ -1241,6 +1321,12 @@ static void pmc_core_dbgfs_register(struct pmc_dev *pmcdev)
>  				    pmcdev->dbgfs_dir, pmcdev,
>  				    &pmc_core_substate_l_sts_regs_fops);
>  	}
> +
> +	if (pmcdev->lpm_req_regs) {
> +		debugfs_create_file("substate_requirements", 0444,
> +				    pmcdev->dbgfs_dir, pmcdev,
> +				    &pmc_core_substate_req_regs_fops);
> +	}
>  }
>  
>  static const struct x86_cpu_id intel_pmc_core_ids[] = {
>