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From:   "David E. Box" <david.e.box@linux.intel.com>
To:     linux-kernel@vger.kernel.org, platform-driver-x86@vger.kernel.org,
        ilpo.jarvinen@linux.intel.com, rajvi.jingar@linux.intel.com
Subject: [PATCH V6 16/20] platform/x86/intel/pmc: Display LPM requirements for multiple PMCs
Date:   Wed, 29 Nov 2023 14:21:28 -0800
Message-Id: <20231129222132.2331261-17-david.e.box@linux.intel.com>
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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>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
---
V6 - Add comment to document reason to check lpm_req_regs for NULL again

V5 - Use conditional instead of if/else to do seq_printf()

V4 - No change

V3 - Add missing submitter signoff

V2 - no change

 drivers/platform/x86/intel/pmc/core.c | 123 ++++++++++++++------------
 1 file changed, 68 insertions(+), 55 deletions(-)

diff --git a/drivers/platform/x86/intel/pmc/core.c b/drivers/platform/x86/intel/pmc/core.c
index 3894119d61b0..9d3a1b6ef622 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;
+	u32 sts_offset;
+	u32 *lpm_req_regs;
+	int num_maps, mp, pmc_index;
 
-	/* Display the header */
-	pmc_core_substate_req_header_show(s);
+	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;
 
-	/* Loop over maps */
-	for (mp = 0; mp < num_maps; mp++) {
-		u32 req_mask = 0;
-		u32 lpm_status;
-		int mode, idx, i, len = 32;
+		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;
 
 		/*
-		 * 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
+		 * When there are multiple PMCs, though the PMC may exist, the
+		 * requirement register discovery could have failed so check
+		 * before accessing.
 		 */
-		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");
-				else
-					seq_printf(s, " %9s |", " ");
+		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) {
+					bool required = lpm_req_regs[mp + (mode * num_maps)] &
+							bit_mask;
+					seq_printf(s, " %9s |", required ? "Required" : " ");
+				}
+
+				/* In Status column, show the last captured state of this agent */
+				seq_printf(s, " %9s |", lpm_status & bit_mask ? "Yes" : " ");
+
+				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);
-- 
2.34.1