Merge branch 'for-6.7/cxl-rch-eh' into cxl/next

Restricted CXL Host (RCH) Error Handling undoes the topology munging of
CXL 1.1 to enabled some AER recovery, and lands some base infrastructure
for handling Root-Complex-Event-Collectors (RCECs) with CXL. Include
this long running series finally for v6.7.

1 files changed, 19 insertions, 29 deletions

diff --git a/drivers/cxl/core/hdm.c b/drivers/cxl/core/hdm.c
index 506c9e14cdf9..d3d338509d96 100644
--- a/drivers/cxl/core/hdm.c
+++ b/drivers/cxl/core/hdm.c
@@ -81,26 +81,6 @@ static void parse_hdm_decoder_caps(struct cxl_hdm *cxlhdm)
 		cxlhdm->interleave_mask |= GENMASK(14, 12);
 }
 
-static int map_hdm_decoder_regs(struct cxl_port *port, void __iomem *crb,
-				struct cxl_component_regs *regs)
-{
-	struct cxl_register_map map = {
-		.dev = &port->dev,
-		.resource = port->component_reg_phys,
-		.base = crb,
-		.max_size = CXL_COMPONENT_REG_BLOCK_SIZE,
-	};
-
-	cxl_probe_component_regs(&port->dev, crb, &map.component_map);
-	if (!map.component_map.hdm_decoder.valid) {
-		dev_dbg(&port->dev, "HDM decoder registers not implemented\n");
-		/* unique error code to indicate no HDM decoder capability */
-		return -ENODEV;
-	}
-
-	return cxl_map_component_regs(&map, regs, BIT(CXL_CM_CAP_CAP_ID_HDM));
-}
-
 static bool should_emulate_decoders(struct cxl_endpoint_dvsec_info *info)
 {
 	struct cxl_hdm *cxlhdm;
@@ -153,9 +133,9 @@ static bool should_emulate_decoders(struct cxl_endpoint_dvsec_info *info)
 struct cxl_hdm *devm_cxl_setup_hdm(struct cxl_port *port,
 				   struct cxl_endpoint_dvsec_info *info)
 {
+	struct cxl_register_map *reg_map = &port->reg_map;
 	struct device *dev = &port->dev;
 	struct cxl_hdm *cxlhdm;
-	void __iomem *crb;
 	int rc;
 
 	cxlhdm = devm_kzalloc(dev, sizeof(*cxlhdm), GFP_KERNEL);
@@ -164,19 +144,29 @@ struct cxl_hdm *devm_cxl_setup_hdm(struct cxl_port *port,
 	cxlhdm->port = port;
 	dev_set_drvdata(dev, cxlhdm);
 
-	crb = ioremap(port->component_reg_phys, CXL_COMPONENT_REG_BLOCK_SIZE);
-	if (!crb && info && info->mem_enabled) {
+	/* Memory devices can configure device HDM using DVSEC range regs. */
+	if (reg_map->resource == CXL_RESOURCE_NONE) {
+		if (!info && !info->mem_enabled) {
+			dev_err(dev, "No component registers mapped\n");
+			return ERR_PTR(-ENXIO);
+		}
+
 		cxlhdm->decoder_count = info->ranges;
 		return cxlhdm;
-	} else if (!crb) {
-		dev_err(dev, "No component registers mapped\n");
-		return ERR_PTR(-ENXIO);
 	}
 
-	rc = map_hdm_decoder_regs(port, crb, &cxlhdm->regs);
-	iounmap(crb);
-	if (rc)
+	if (!reg_map->component_map.hdm_decoder.valid) {
+		dev_dbg(&port->dev, "HDM decoder registers not implemented\n");
+		/* unique error code to indicate no HDM decoder capability */
+		return ERR_PTR(-ENODEV);
+	}
+
+	rc = cxl_map_component_regs(reg_map, &cxlhdm->regs,
+				    BIT(CXL_CM_CAP_CAP_ID_HDM));
+	if (rc) {
+		dev_err(dev, "Failed to map HDM capability.\n");
 		return ERR_PTR(rc);
+	}
 
 	parse_hdm_decoder_caps(cxlhdm);
 	if (cxlhdm->decoder_count == 0) {