Commit 952c1553 authored by Gayatri Kammela's avatar Gayatri Kammela Committed by Hans de Goede
Browse files

platform/x86: intel_pmc_core: Add requirements file to debugfs 



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: default avatarGayatri Kammela <gayatri.kammela@intel.com>
Co-developed-by: default avatarDavid E. Box <david.e.box@linux.intel.com>
Signed-off-by: default avatarDavid E. Box <david.e.box@linux.intel.com>
Reviewed-by: default avatarHans de Goede <hdegoede@redhat.com>
Link: https://lore.kernel.org/r/20210417031252.3020837-7-david.e.box@linux.intel.com


Signed-off-by: default avatarHans de Goede <hdegoede@redhat.com>
parent 42813136

drivers/platform/x86/intel_pmc_core.c

+86 −0
Original line number Diff line number Diff line
@@ -1241,6 +1241,86 @@ 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;
@@ -1360,6 +1440,12 @@ 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[] = {