platform/x86:intel/pmc: Show substate requirement for S0ix blockers

Add support to read and show S0ix blocker substate requirements.
Starting from Panther Lake, substate requirement data is provided
based on S0ix blockers instead of all low power mode requirements.
For platforms that support this new feature, add support to display
substate requirements based on S0ix blockers.

Change the "substate_requirements" attribute of Intel PMC Core
driver to show the substate requirements for each S0ix blocker
and the corresponding S0ix blocker value.

Signed-off-by: Xi Pardee <xi.pardee@linux.intel.com>
Link: https://patch.msgid.link/20250910210629.11198-5-xi.pardee@linux.intel.com
[ij: rename pmc_index -> pmc_idx]
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>

1 files changed, 111 insertions, 10 deletions

diff --git a/drivers/platform/x86/intel/pmc/core.c b/drivers/platform/x86/intel/pmc/core.c
index b3e9ea31db9c..de2dbf4ad65e 100644
--- a/drivers/platform/x86/intel/pmc/core.c
+++ b/drivers/platform/x86/intel/pmc/core.c
@@ -851,6 +851,68 @@ static void pmc_core_substate_req_header_show(struct seq_file *s, int pmc_index,
 	}
 }
 
+static int pmc_core_substate_blk_req_show(struct seq_file *s, void *unused)
+{
+	struct pmc_dev *pmcdev = s->private;
+	unsigned int pmc_idx;
+
+	for (pmc_idx = 0; pmc_idx < ARRAY_SIZE(pmcdev->pmcs); pmc_idx++) {
+		const struct pmc_bit_map **maps;
+		unsigned int arr_size, r_idx;
+		u32 offset, counter;
+		u32 *lpm_req_regs;
+		struct pmc *pmc;
+
+		pmc = pmcdev->pmcs[pmc_idx];
+		if (!pmc || !pmc->lpm_req_regs)
+			continue;
+
+		lpm_req_regs = pmc->lpm_req_regs;
+		maps = pmc->map->s0ix_blocker_maps;
+		offset = pmc->map->s0ix_blocker_offset;
+		arr_size = pmc_core_lpm_get_arr_size(maps);
+
+		/* Display the header */
+		pmc_core_substate_req_header_show(s, pmc_idx, HEADER_VALUE);
+
+		for (r_idx = 0; r_idx < arr_size; r_idx++) {
+			const struct pmc_bit_map *map;
+
+			for (map = maps[r_idx]; map->name; map++) {
+				int mode;
+
+				if (!map->blk)
+					continue;
+
+				counter = pmc_core_reg_read(pmc, offset);
+				seq_printf(s, "pmc%u: %34s |", pmc_idx, map->name);
+				pmc_for_each_mode(mode, pmcdev) {
+					bool required = *lpm_req_regs & BIT(mode);
+
+					seq_printf(s, " %9s |", required ? "Required" : " ");
+				}
+				seq_printf(s, " %9u |\n", counter);
+				offset += map->blk * S0IX_BLK_SIZE;
+				lpm_req_regs++;
+			}
+		}
+	}
+	return 0;
+}
+
+static int pmc_core_substate_blk_req_open(struct inode *inode, struct file *file)
+{
+	return single_open(file, pmc_core_substate_blk_req_show, inode->i_private);
+}
+
+const struct file_operations pmc_core_substate_blk_req_fops = {
+	.owner		= THIS_MODULE,
+	.open		= pmc_core_substate_blk_req_open,
+	.read		= seq_read,
+	.llseek		= seq_lseek,
+	.release	= single_release,
+};
+
 static int pmc_core_substate_req_regs_show(struct seq_file *s, void *unused)
 {
 	struct pmc_dev *pmcdev = s->private;
@@ -941,7 +1003,19 @@ static int pmc_core_substate_req_regs_show(struct seq_file *s, void *unused)
 	}
 	return 0;
 }
-DEFINE_SHOW_ATTRIBUTE(pmc_core_substate_req_regs);
+
+static int pmc_core_substate_req_regs_open(struct inode *inode, struct file *file)
+{
+	return single_open(file, pmc_core_substate_req_regs_show, inode->i_private);
+}
+
+const struct file_operations pmc_core_substate_req_regs_fops = {
+	.owner		= THIS_MODULE,
+	.open		= pmc_core_substate_req_regs_open,
+	.read		= seq_read,
+	.llseek		= seq_lseek,
+	.release	= single_release,
+};
 
 static unsigned int pmc_core_get_crystal_freq(void)
 {
@@ -1274,7 +1348,7 @@ static void pmc_core_dbgfs_unregister(struct pmc_dev *pmcdev)
 	debugfs_remove_recursive(pmcdev->dbgfs_dir);
 }
 
-static void pmc_core_dbgfs_register(struct pmc_dev *pmcdev)
+static void pmc_core_dbgfs_register(struct pmc_dev *pmcdev, struct pmc_dev_info *pmc_dev_info)
 {
 	struct pmc *primary_pmc = pmcdev->pmcs[PMC_IDX_MAIN];
 	struct dentry *dir;
@@ -1341,7 +1415,7 @@ static void pmc_core_dbgfs_register(struct pmc_dev *pmcdev)
 	if (primary_pmc->lpm_req_regs) {
 		debugfs_create_file("substate_requirements", 0444,
 				    pmcdev->dbgfs_dir, pmcdev,
-				    &pmc_core_substate_req_regs_fops);
+				    pmc_dev_info->sub_req_show);
 	}
 
 	if (primary_pmc->map->pson_residency_offset && pmc_core_is_pson_residency_enabled(pmcdev)) {
@@ -1409,8 +1483,7 @@ static u32 pmc_core_find_guid(struct pmc_info *list, const struct pmc_reg_map *m
  * +----+---------------------------------------------------------+
  *
  */
-static int pmc_core_pmt_get_lpm_req(struct pmc_dev *pmcdev, struct pmc *pmc,
-				    struct telem_endpoint *ep)
+int pmc_core_pmt_get_lpm_req(struct pmc_dev *pmcdev, struct pmc *pmc, struct telem_endpoint *ep)
 {
 	const u8 *lpm_indices;
 	int num_maps, mode_offset = 0;
@@ -1448,7 +1521,35 @@ static int pmc_core_pmt_get_lpm_req(struct pmc_dev *pmcdev, struct pmc *pmc,
 	return ret;
 }
 
-static int pmc_core_get_telem_info(struct pmc_dev *pmcdev, int func)
+int pmc_core_pmt_get_blk_sub_req(struct pmc_dev *pmcdev, struct pmc *pmc,
+				 struct telem_endpoint *ep)
+{
+	u32 num_blocker, sample_offset;
+	unsigned int index;
+	u32 *req_offset;
+	int ret;
+
+	num_blocker = pmc->map->num_s0ix_blocker;
+	sample_offset = pmc->map->blocker_req_offset;
+
+	pmc->lpm_req_regs = devm_kcalloc(&pmcdev->pdev->dev, num_blocker,
+					 sizeof(u32), GFP_KERNEL);
+	if (!pmc->lpm_req_regs)
+		return -ENOMEM;
+
+	req_offset = pmc->lpm_req_regs;
+	for (index = 0; index < num_blocker; index++, req_offset++) {
+		ret = pmt_telem_read32(ep, index + sample_offset, req_offset, 1);
+		if (ret) {
+			dev_err(&pmcdev->pdev->dev,
+				"couldn't read Low Power Mode requirements: %d\n", ret);
+			return ret;
+		}
+	}
+	return 0;
+}
+
+static int pmc_core_get_telem_info(struct pmc_dev *pmcdev, struct pmc_dev_info *pmc_dev_info)
 {
 	struct pci_dev *pcidev __free(pci_dev_put) = NULL;
 	struct telem_endpoint *ep;
@@ -1456,7 +1557,7 @@ static int pmc_core_get_telem_info(struct pmc_dev *pmcdev, int func)
 	u32 guid;
 	int ret;
 
-	pcidev = pci_get_domain_bus_and_slot(0, 0, PCI_DEVFN(20, func));
+	pcidev = pci_get_domain_bus_and_slot(0, 0, PCI_DEVFN(20, pmc_dev_info->pci_func));
 	if (!pcidev)
 		return -ENODEV;
 
@@ -1477,7 +1578,7 @@ static int pmc_core_get_telem_info(struct pmc_dev *pmcdev, int func)
 			return -EPROBE_DEFER;
 		}
 
-		ret = pmc_core_pmt_get_lpm_req(pmcdev, pmc, ep);
+		ret = pmc_dev_info->sub_req(pmcdev, pmc, ep);
 		pmt_telem_unregister_endpoint(ep);
 		if (ret)
 			return ret;
@@ -1592,7 +1693,7 @@ int generic_core_init(struct pmc_dev *pmcdev, struct pmc_dev_info *pmc_dev_info)
 		pmc_core_punit_pmt_init(pmcdev, pmc_dev_info->dmu_guid);
 
 	if (ssram) {
-		ret = pmc_core_get_telem_info(pmcdev, pmc_dev_info->pci_func);
+		ret = pmc_core_get_telem_info(pmcdev, pmc_dev_info);
 		if (ret)
 			goto unmap_regbase;
 	}
@@ -1767,7 +1868,7 @@ static int pmc_core_probe(struct platform_device *pdev)
 	pmcdev->pmc_xram_read_bit = pmc_core_check_read_lock_bit(primary_pmc);
 	pmc_core_do_dmi_quirks(primary_pmc);
 
-	pmc_core_dbgfs_register(pmcdev);
+	pmc_core_dbgfs_register(pmcdev, pmc_dev_info);
 	pm_report_max_hw_sleep(FIELD_MAX(SLP_S0_RES_COUNTER_MASK) *
 			       pmc_core_adjust_slp_s0_step(primary_pmc, 1));