linux-kernel - [PATCH 2/3] platform/x86:intel/pmc: Add support to show S0ix blocker counter

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Message-Id: <20240426002752.2504282-3-xi.pardee@linux.intel.com>
Date: Thu, 25 Apr 2024 17:27:51 -0700
From: Xi Pardee <xi.pardee@...ux.intel.com>
To: xi.pardee@...ux.intel.com,
	irenic.rajneesh@...il.com,
	david.e.box@...el.com,
	hdegoede@...hat.com,
	ilpo.jarvinen@...ux.intel.com,
	platform-driver-x86@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 2/3] platform/x86:intel/pmc: Add support to show S0ix blocker counter

From: Xi Pardee <xi.pardee@...el.com>

S0ix blocker counter is available in PWRM space. Add support to
read and show S0ix blocker counter value through debugfs.

Signed-off-by: Xi Pardee <xi.pardee@...el.com>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
---
 drivers/platform/x86/intel/pmc/core.c | 38 +++++++++++++++++++++++++++
 drivers/platform/x86/intel/pmc/core.h |  6 +++++
 2 files changed, 44 insertions(+)

diff --git a/drivers/platform/x86/intel/pmc/core.c b/drivers/platform/x86/intel/pmc/core.c
index 10c96c1a850a..2ad2f8753e5d 100644
--- a/drivers/platform/x86/intel/pmc/core.c
+++ b/drivers/platform/x86/intel/pmc/core.c
@@ -678,6 +678,41 @@ static int pmc_core_ltr_show(struct seq_file *s, void *unused)
 }
 DEFINE_SHOW_ATTRIBUTE(pmc_core_ltr);
 
+static int pmc_core_s0ix_blocker_show(struct seq_file *s, void *unused)
+{
+	struct pmc_dev *pmcdev = s->private;
+	unsigned int pmcidx;
+
+	for (pmcidx = 0; pmcidx < ARRAY_SIZE(pmcdev->pmcs); pmcidx++) {
+		const struct pmc_bit_map **maps;
+		unsigned int arr_size, r_idx;
+		u32 offset, counter;
+		struct pmc *pmc;
+
+		pmc = pmcdev->pmcs[pmcidx];
+		if (!pmc)
+			continue;
+		maps = pmc->map->s0ix_blocker_maps;
+		offset = pmc->map->s0ix_blocker_offset;
+		arr_size = pmc_core_lpm_get_arr_size(maps);
+
+		for (r_idx = 0; r_idx < arr_size; r_idx++) {
+			const struct pmc_bit_map *map;
+
+			for (map = maps[r_idx]; map->name; map++) {
+				if (!map->blk)
+					continue;
+				counter = pmc_core_reg_read(pmc, offset);
+				seq_printf(s, "PMC%d:%-30s %-30d\n", pmcidx,
+					   map->name, counter);
+				offset += map->blk * S0IX_BLK_SIZE;
+			}
+		}
+	}
+	return 0;
+}
+DEFINE_SHOW_ATTRIBUTE(pmc_core_s0ix_blocker);
+
 static inline u64 adjust_lpm_residency(struct pmc *pmc, u32 offset,
 				       const int lpm_adj_x2)
 {
@@ -1197,6 +1232,9 @@ static void pmc_core_dbgfs_register(struct pmc_dev *pmcdev)
 
 	debugfs_create_file("ltr_show", 0444, dir, pmcdev, &pmc_core_ltr_fops);
 
+	if (primary_pmc->map->s0ix_blocker_maps)
+		debugfs_create_file("s0ix_blocker", 0444, dir, pmcdev, &pmc_core_s0ix_blocker_fops);
+
 	debugfs_create_file("package_cstate_show", 0444, dir, primary_pmc,
 			    &pmc_core_pkgc_fops);
 
diff --git a/drivers/platform/x86/intel/pmc/core.h b/drivers/platform/x86/intel/pmc/core.h
index 18ba4f901c10..88acfa801b5a 100644
--- a/drivers/platform/x86/intel/pmc/core.h
+++ b/drivers/platform/x86/intel/pmc/core.h
@@ -22,6 +22,7 @@ struct telem_endpoint;
 
 #define PMC_BASE_ADDR_DEFAULT			0xFE000000
 #define MAX_NUM_PMC			3
+#define S0IX_BLK_SIZE			4
 
 /* Sunrise Point Power Management Controller PCI Device ID */
 #define SPT_PMC_PCI_DEVICE_ID			0x9d21
@@ -288,6 +289,7 @@ extern const char *pmc_lpm_modes[];
 struct pmc_bit_map {
 	const char *name;
 	u32 bit_mask;
+	u8 blk;
 };
 
 /**
@@ -298,6 +300,7 @@ struct pmc_bit_map {
  * @pll_sts:		Maps name of PLL to corresponding bit status
  * @slps0_dbg_maps:	Array of SLP_S0_DBG* registers containing debug info
  * @ltr_show_sts:	Maps PCH IP Names to their MMIO register offsets
+ * @s0ix_blocker_maps:	Maps name of IP block to S0ix blocker counter
  * @slp_s0_offset:	PWRMBASE offset to read SLP_S0 residency
  * @ltr_ignore_offset:	PWRMBASE offset to read/write LTR ignore bit
  * @regmap_length:	Length of memory to map from PWRMBASE address to access
@@ -307,6 +310,7 @@ struct pmc_bit_map {
  * @pm_cfg_offset:	PWRMBASE offset to PM_CFG register
  * @pm_read_disable_bit: Bit index to read PMC_READ_DISABLE
  * @slps0_dbg_offset:	PWRMBASE offset to SLP_S0_DEBUG_REG*
+ * @s0ix_blocker_offset PWRMBASE offset to S0ix blocker counter
  *
  * Each PCH has unique set of register offsets and bit indexes. This structure
  * captures them to have a common implementation.
@@ -319,6 +323,7 @@ struct pmc_reg_map {
 	const struct pmc_bit_map *ltr_show_sts;
 	const struct pmc_bit_map *msr_sts;
 	const struct pmc_bit_map **lpm_sts;
+	const struct pmc_bit_map **s0ix_blocker_maps;
 	const u32 slp_s0_offset;
 	const int slp_s0_res_counter_step;
 	const u32 ltr_ignore_offset;
@@ -330,6 +335,7 @@ struct pmc_reg_map {
 	const u32 slps0_dbg_offset;
 	const u32 ltr_ignore_max;
 	const u32 pm_vric1_offset;
+	const u32 s0ix_blocker_offset;
 	/* Low Power Mode registers */
 	const int lpm_num_maps;
 	const int lpm_num_modes;
-- 
2.34.1