linux-kernel - [PATCH v2 3/4] platform/x86/intel/pmc: Enable substate residencies for multiple PMCs

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Message-ID: <20260108223144.504267-4-xi.pardee@linux.intel.com>
Date: Thu,  8 Jan 2026 14:31:41 -0800
From: Xi Pardee <xi.pardee@...ux.intel.com>
To: xi.pardee@...ux.intel.com,
	irenic.rajneesh@...il.com,
	david.e.box@...ux.intel.com,
	ilpo.jarvinen@...ux.intel.com,
	platform-driver-x86@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-pm@...r.kernel.org
Subject: [PATCH v2 3/4] platform/x86/intel/pmc: Enable substate residencies for multiple PMCs

Enable substate residencies support for multiple PMCs. Previously
substate residencies were shown only for the primary PMC. This
change enables substate residencies for all available PMCs.

The output of substate_residencies with this patch will be similar
to this:
pmc0   Substate       Residency
         S0i2.0               0
         S0i2.1               0
         S0i2.2               0
pmc1   Substate       Residency
         S0i2.0               0
         S0i2.1               0
         S0i2.2               0
pmc2   Substate       Residency
         S0i2.0               0

Signed-off-by: Xi Pardee <xi.pardee@...ux.intel.com>
---
 drivers/platform/x86/intel/pmc/core.c | 26 ++++++++++++++++++--------
 1 file changed, 18 insertions(+), 8 deletions(-)

diff --git a/drivers/platform/x86/intel/pmc/core.c b/drivers/platform/x86/intel/pmc/core.c
index c76934ad7bf1d..e16f9630b908c 100644
--- a/drivers/platform/x86/intel/pmc/core.c
+++ b/drivers/platform/x86/intel/pmc/core.c
@@ -776,16 +776,26 @@ static inline u64 adjust_lpm_residency(struct pmc *pmc, u32 offset,
 static int pmc_core_substate_res_show(struct seq_file *s, void *unused)
 {
 	struct pmc_dev *pmcdev = s->private;
-	struct pmc *pmc = pmcdev->pmcs[PMC_IDX_MAIN];
-	const int lpm_adj_x2 = pmc->map->lpm_res_counter_step_x2;
-	u32 offset = pmc->map->lpm_residency_offset;
-	u8 mode;
+	unsigned int pmc_idx;
+
+	for (pmc_idx = 0; pmc_idx < ARRAY_SIZE(pmcdev->pmcs); ++pmc_idx) {
+		int lpm_adj_x2;
+		struct pmc *pmc;
+		u32 offset;
+		u8 mode;
 
-	seq_printf(s, "%-10s %-15s\n", "Substate", "Residency");
+		pmc = pmcdev->pmcs[pmc_idx];
+		if (!pmc)
+			continue;
 
-	pmc_for_each_mode(mode, pmc) {
-		seq_printf(s, "%-10s %-15llu\n", pmc_lpm_modes[mode],
-			   adjust_lpm_residency(pmc, offset + (4 * mode), lpm_adj_x2));
+		lpm_adj_x2 = pmc->map->lpm_res_counter_step_x2;
+		offset = pmc->map->lpm_residency_offset;
+
+		seq_printf(s, "pmc%u %10s %15s\n", pmc_idx, "Substate", "Residency");
+		pmc_for_each_mode(mode, pmc) {
+			seq_printf(s, "%15s %15llu\n", pmc_lpm_modes[mode],
+				   adjust_lpm_residency(pmc, offset + (4 * mode), lpm_adj_x2));
+		}
 	}
 
 	return 0;
-- 
2.43.0