18 files changed, 324 insertions, 165 deletions

diff --git a/drivers/cxl/acpi.c b/drivers/cxl/acpi.c
index 432b7cfd12a8..cb14829bb9be 100644
--- a/drivers/cxl/acpi.c
+++ b/drivers/cxl/acpi.c
@@ -934,5 +934,5 @@ MODULE_SOFTDEP("pre: cxl_port");
 module_exit(cxl_acpi_exit);
 MODULE_DESCRIPTION("CXL ACPI: Platform Support");
 MODULE_LICENSE("GPL v2");
-MODULE_IMPORT_NS(CXL);
-MODULE_IMPORT_NS(ACPI);
+MODULE_IMPORT_NS("CXL");
+MODULE_IMPORT_NS("ACPI");
diff --git a/drivers/cxl/core/cdat.c b/drivers/cxl/core/cdat.c
index e9cd7939c407..8153f8d83a16 100644
--- a/drivers/cxl/core/cdat.c
+++ b/drivers/cxl/core/cdat.c
@@ -247,8 +247,8 @@ static void update_perf_entry(struct device *dev, struct dsmas_entry *dent,
 	dpa_perf->dpa_range = dent->dpa_range;
 	dpa_perf->qos_class = dent->qos_class;
 	dev_dbg(dev,
-		"DSMAS: dpa: %#llx qos: %d read_bw: %d write_bw %d read_lat: %d write_lat: %d\n",
-		dent->dpa_range.start, dpa_perf->qos_class,
+		"DSMAS: dpa: %pra qos: %d read_bw: %d write_bw %d read_lat: %d write_lat: %d\n",
+		&dent->dpa_range, dpa_perf->qos_class,
 		dent->coord[ACCESS_COORDINATE_CPU].read_bandwidth,
 		dent->coord[ACCESS_COORDINATE_CPU].write_bandwidth,
 		dent->coord[ACCESS_COORDINATE_CPU].read_latency,
@@ -279,8 +279,8 @@ static void cxl_memdev_set_qos_class(struct cxl_dev_state *cxlds,
 			 range_contains(&pmem_range, &dent->dpa_range))
 			update_perf_entry(dev, dent, &mds->pmem_perf);
 		else
-			dev_dbg(dev, "no partition for dsmas dpa: %#llx\n",
-				dent->dpa_range.start);
+			dev_dbg(dev, "no partition for dsmas dpa: %pra\n",
+				&dent->dpa_range);
 	}
 }
 
@@ -416,7 +416,7 @@ void cxl_endpoint_parse_cdat(struct cxl_port *port)
 	cxl_qos_class_verify(cxlmd);
 	cxl_memdev_update_perf(cxlmd);
 }
-EXPORT_SYMBOL_NS_GPL(cxl_endpoint_parse_cdat, CXL);
+EXPORT_SYMBOL_NS_GPL(cxl_endpoint_parse_cdat, "CXL");
 
 static int cdat_sslbis_handler(union acpi_subtable_headers *header, void *arg,
 			       const unsigned long end)
@@ -513,7 +513,7 @@ void cxl_switch_parse_cdat(struct cxl_port *port)
 	if (rc)
 		dev_dbg(&port->dev, "Failed to parse SSLBIS: %d\n", rc);
 }
-EXPORT_SYMBOL_NS_GPL(cxl_switch_parse_cdat, CXL);
+EXPORT_SYMBOL_NS_GPL(cxl_switch_parse_cdat, "CXL");
 
 static void __cxl_coordinates_combine(struct access_coordinate *out,
 				      struct access_coordinate *c1,
@@ -545,7 +545,7 @@ void cxl_coordinates_combine(struct access_coordinate *out,
 		__cxl_coordinates_combine(&out[i], &c1[i], &c2[i]);
 }
 
-MODULE_IMPORT_NS(CXL);
+MODULE_IMPORT_NS("CXL");
 
 static void cxl_bandwidth_add(struct access_coordinate *coord,
 			      struct access_coordinate *c1,
diff --git a/drivers/cxl/core/core.h b/drivers/cxl/core/core.h
index 0c62b4069ba0..800466f96a68 100644
--- a/drivers/cxl/core/core.h
+++ b/drivers/cxl/core/core.h
@@ -89,6 +89,11 @@ resource_size_t __rcrb_to_component(struct device *dev,
 				    enum cxl_rcrb which);
 u16 cxl_rcrb_to_aer(struct device *dev, resource_size_t rcrb);
 
+#define PCI_RCRB_CAP_LIST_ID_MASK	GENMASK(7, 0)
+#define PCI_RCRB_CAP_HDR_ID_MASK	GENMASK(7, 0)
+#define PCI_RCRB_CAP_HDR_NEXT_MASK	GENMASK(15, 8)
+#define PCI_CAP_EXP_SIZEOF		0x3c
+
 extern struct rw_semaphore cxl_dpa_rwsem;
 extern struct rw_semaphore cxl_region_rwsem;
 
diff --git a/drivers/cxl/core/hdm.c b/drivers/cxl/core/hdm.c
index 223c273c0cd1..28edd5822486 100644
--- a/drivers/cxl/core/hdm.c
+++ b/drivers/cxl/core/hdm.c
@@ -73,7 +73,7 @@ int devm_cxl_add_passthrough_decoder(struct cxl_port *port)
 
 	return add_hdm_decoder(port, &cxlsd->cxld, single_port_map);
 }
-EXPORT_SYMBOL_NS_GPL(devm_cxl_add_passthrough_decoder, CXL);
+EXPORT_SYMBOL_NS_GPL(devm_cxl_add_passthrough_decoder, "CXL");
 
 static void parse_hdm_decoder_caps(struct cxl_hdm *cxlhdm)
 {
@@ -199,7 +199,7 @@ struct cxl_hdm *devm_cxl_setup_hdm(struct cxl_port *port,
 
 	return cxlhdm;
 }
-EXPORT_SYMBOL_NS_GPL(devm_cxl_setup_hdm, CXL);
+EXPORT_SYMBOL_NS_GPL(devm_cxl_setup_hdm, "CXL");
 
 static void __cxl_dpa_debug(struct seq_file *file, struct resource *r, int depth)
 {
@@ -221,7 +221,7 @@ void cxl_dpa_debug(struct seq_file *file, struct cxl_dev_state *cxlds)
 	}
 	up_read(&cxl_dpa_rwsem);
 }
-EXPORT_SYMBOL_NS_GPL(cxl_dpa_debug, CXL);
+EXPORT_SYMBOL_NS_GPL(cxl_dpa_debug, "CXL");
 
 /*
  * Must be called in a context that synchronizes against this decoder's
@@ -358,7 +358,7 @@ int devm_cxl_dpa_reserve(struct cxl_endpoint_decoder *cxled,
 
 	return devm_add_action_or_reset(&port->dev, cxl_dpa_release, cxled);
 }
-EXPORT_SYMBOL_NS_GPL(devm_cxl_dpa_reserve, CXL);
+EXPORT_SYMBOL_NS_GPL(devm_cxl_dpa_reserve, "CXL");
 
 resource_size_t cxl_dpa_size(struct cxl_endpoint_decoder *cxled)
 {
@@ -424,7 +424,6 @@ int cxl_dpa_set_mode(struct cxl_endpoint_decoder *cxled,
 	struct cxl_memdev *cxlmd = cxled_to_memdev(cxled);
 	struct cxl_dev_state *cxlds = cxlmd->cxlds;
 	struct device *dev = &cxled->cxld.dev;
-	int rc;
 
 	switch (mode) {
 	case CXL_DECODER_RAM:
@@ -435,11 +434,9 @@ int cxl_dpa_set_mode(struct cxl_endpoint_decoder *cxled,
 		return -EINVAL;
 	}
 
-	down_write(&cxl_dpa_rwsem);
-	if (cxled->cxld.flags & CXL_DECODER_F_ENABLE) {
-		rc = -EBUSY;
-		goto out;
-	}
+	guard(rwsem_write)(&cxl_dpa_rwsem);
+	if (cxled->cxld.flags & CXL_DECODER_F_ENABLE)
+		return -EBUSY;
 
 	/*
 	 * Only allow modes that are supported by the current partition
@@ -447,21 +444,15 @@ int cxl_dpa_set_mode(struct cxl_endpoint_decoder *cxled,
 	 */
 	if (mode == CXL_DECODER_PMEM && !resource_size(&cxlds->pmem_res)) {
 		dev_dbg(dev, "no available pmem capacity\n");
-		rc = -ENXIO;
-		goto out;
+		return -ENXIO;
 	}
 	if (mode == CXL_DECODER_RAM && !resource_size(&cxlds->ram_res)) {
 		dev_dbg(dev, "no available ram capacity\n");
-		rc = -ENXIO;
-		goto out;
+		return -ENXIO;
 	}
 
 	cxled->mode = mode;
-	rc = 0;
-out:
-	up_write(&cxl_dpa_rwsem);
-
-	return rc;
+	return 0;
 }
 
 int cxl_dpa_alloc(struct cxl_endpoint_decoder *cxled, unsigned long long size)
@@ -747,7 +738,7 @@ void cxl_port_commit_reap(struct cxl_decoder *cxld)
 	device_for_each_child_reverse_from(&port->dev, &cxld->dev, NULL,
 					   commit_reap);
 }
-EXPORT_SYMBOL_NS_GPL(cxl_port_commit_reap, CXL);
+EXPORT_SYMBOL_NS_GPL(cxl_port_commit_reap, "CXL");
 
 static void cxl_decoder_reset(struct cxl_decoder *cxld)
 {
@@ -1073,4 +1064,4 @@ int devm_cxl_enumerate_decoders(struct cxl_hdm *cxlhdm,
 
 	return 0;
 }
-EXPORT_SYMBOL_NS_GPL(devm_cxl_enumerate_decoders, CXL);
+EXPORT_SYMBOL_NS_GPL(devm_cxl_enumerate_decoders, "CXL");
diff --git a/drivers/cxl/core/mbox.c b/drivers/cxl/core/mbox.c
index 5175138c4fb7..548564c770c0 100644
--- a/drivers/cxl/core/mbox.c
+++ b/drivers/cxl/core/mbox.c
@@ -281,7 +281,7 @@ int cxl_internal_send_cmd(struct cxl_mailbox *cxl_mbox,
 		return -EIO;
 	return 0;
 }
-EXPORT_SYMBOL_NS_GPL(cxl_internal_send_cmd, CXL);
+EXPORT_SYMBOL_NS_GPL(cxl_internal_send_cmd, "CXL");
 
 static bool cxl_mem_raw_command_allowed(u16 opcode)
 {
@@ -854,7 +854,7 @@ out:
 	kvfree(gsl);
 	return rc;
 }
-EXPORT_SYMBOL_NS_GPL(cxl_enumerate_cmds, CXL);
+EXPORT_SYMBOL_NS_GPL(cxl_enumerate_cmds, "CXL");
 
 void cxl_event_trace_record(const struct cxl_memdev *cxlmd,
 			    enum cxl_event_log_type type,
@@ -894,7 +894,7 @@ void cxl_event_trace_record(const struct cxl_memdev *cxlmd,
 			trace_cxl_dram(cxlmd, type, cxlr, hpa, &evt->dram);
 	}
 }
-EXPORT_SYMBOL_NS_GPL(cxl_event_trace_record, CXL);
+EXPORT_SYMBOL_NS_GPL(cxl_event_trace_record, "CXL");
 
 static void __cxl_event_trace_record(const struct cxl_memdev *cxlmd,
 				     enum cxl_event_log_type type,
@@ -1063,7 +1063,7 @@ void cxl_mem_get_event_records(struct cxl_memdev_state *mds, u32 status)
 	if (status & CXLDEV_EVENT_STATUS_INFO)
 		cxl_mem_get_records_log(mds, CXL_EVENT_TYPE_INFO);
 }
-EXPORT_SYMBOL_NS_GPL(cxl_mem_get_event_records, CXL);
+EXPORT_SYMBOL_NS_GPL(cxl_mem_get_event_records, "CXL");
 
 /**
  * cxl_mem_get_partition_info - Get partition info
@@ -1155,7 +1155,7 @@ int cxl_dev_state_identify(struct cxl_memdev_state *mds)
 
 	return 0;
 }
-EXPORT_SYMBOL_NS_GPL(cxl_dev_state_identify, CXL);
+EXPORT_SYMBOL_NS_GPL(cxl_dev_state_identify, "CXL");
 
 static int __cxl_mem_sanitize(struct cxl_memdev_state *mds, u16 cmd)
 {
@@ -1306,7 +1306,7 @@ int cxl_mem_create_range_info(struct cxl_memdev_state *mds)
 			   mds->active_volatile_bytes,
 			   mds->active_persistent_bytes, "pmem");
 }
-EXPORT_SYMBOL_NS_GPL(cxl_mem_create_range_info, CXL);
+EXPORT_SYMBOL_NS_GPL(cxl_mem_create_range_info, "CXL");
 
 int cxl_set_timestamp(struct cxl_memdev_state *mds)
 {
@@ -1333,7 +1333,7 @@ int cxl_set_timestamp(struct cxl_memdev_state *mds)
 
 	return 0;
 }
-EXPORT_SYMBOL_NS_GPL(cxl_set_timestamp, CXL);
+EXPORT_SYMBOL_NS_GPL(cxl_set_timestamp, "CXL");
 
 int cxl_mem_get_poison(struct cxl_memdev *cxlmd, u64 offset, u64 len,
 		       struct cxl_region *cxlr)
@@ -1384,7 +1384,7 @@ int cxl_mem_get_poison(struct cxl_memdev *cxlmd, u64 offset, u64 len,
 	mutex_unlock(&mds->poison.lock);
 	return rc;
 }
-EXPORT_SYMBOL_NS_GPL(cxl_mem_get_poison, CXL);
+EXPORT_SYMBOL_NS_GPL(cxl_mem_get_poison, "CXL");
 
 static void free_poison_buf(void *buf)
 {
@@ -1420,7 +1420,7 @@ int cxl_poison_state_init(struct cxl_memdev_state *mds)
 	mutex_init(&mds->poison.lock);
 	return 0;
 }
-EXPORT_SYMBOL_NS_GPL(cxl_poison_state_init, CXL);
+EXPORT_SYMBOL_NS_GPL(cxl_poison_state_init, "CXL");
 
 int cxl_mailbox_init(struct cxl_mailbox *cxl_mbox, struct device *host)
 {
@@ -1433,7 +1433,7 @@ int cxl_mailbox_init(struct cxl_mailbox *cxl_mbox, struct device *host)
 
 	return 0;
 }
-EXPORT_SYMBOL_NS_GPL(cxl_mailbox_init, CXL);
+EXPORT_SYMBOL_NS_GPL(cxl_mailbox_init, "CXL");
 
 struct cxl_memdev_state *cxl_memdev_state_create(struct device *dev)
 {
@@ -1455,7 +1455,7 @@ struct cxl_memdev_state *cxl_memdev_state_create(struct device *dev)
 
 	return mds;
 }
-EXPORT_SYMBOL_NS_GPL(cxl_memdev_state_create, CXL);
+EXPORT_SYMBOL_NS_GPL(cxl_memdev_state_create, "CXL");
 
 void __init cxl_mbox_init(void)
 {
diff --git a/drivers/cxl/core/memdev.c b/drivers/cxl/core/memdev.c
index 84fefb76dafa..ae3dfcbe8938 100644
--- a/drivers/cxl/core/memdev.c
+++ b/drivers/cxl/core/memdev.c
@@ -250,7 +250,7 @@ int cxl_trigger_poison_list(struct cxl_memdev *cxlmd)
 
 	return rc;
 }
-EXPORT_SYMBOL_NS_GPL(cxl_trigger_poison_list, CXL);
+EXPORT_SYMBOL_NS_GPL(cxl_trigger_poison_list, "CXL");
 
 static int cxl_validate_poison_dpa(struct cxl_memdev *cxlmd, u64 dpa)
 {
@@ -329,7 +329,7 @@ out:
 
 	return rc;
 }
-EXPORT_SYMBOL_NS_GPL(cxl_inject_poison, CXL);
+EXPORT_SYMBOL_NS_GPL(cxl_inject_poison, "CXL");
 
 int cxl_clear_poison(struct cxl_memdev *cxlmd, u64 dpa)
 {
@@ -393,7 +393,7 @@ out:
 
 	return rc;
 }
-EXPORT_SYMBOL_NS_GPL(cxl_clear_poison, CXL);
+EXPORT_SYMBOL_NS_GPL(cxl_clear_poison, "CXL");
 
 static struct attribute *cxl_memdev_attributes[] = {
 	&dev_attr_serial.attr,
@@ -537,7 +537,7 @@ void cxl_memdev_update_perf(struct cxl_memdev *cxlmd)
 	sysfs_update_group(&cxlmd->dev.kobj, &cxl_memdev_ram_attribute_group);
 	sysfs_update_group(&cxlmd->dev.kobj, &cxl_memdev_pmem_attribute_group);
 }
-EXPORT_SYMBOL_NS_GPL(cxl_memdev_update_perf, CXL);
+EXPORT_SYMBOL_NS_GPL(cxl_memdev_update_perf, "CXL");
 
 static const struct device_type cxl_memdev_type = {
 	.name = "cxl_memdev",
@@ -550,7 +550,7 @@ bool is_cxl_memdev(const struct device *dev)
 {
 	return dev->type == &cxl_memdev_type;
 }
-EXPORT_SYMBOL_NS_GPL(is_cxl_memdev, CXL);
+EXPORT_SYMBOL_NS_GPL(is_cxl_memdev, "CXL");
 
 /**
  * set_exclusive_cxl_commands() - atomically disable user cxl commands
@@ -569,7 +569,7 @@ void set_exclusive_cxl_commands(struct cxl_memdev_state *mds,
 		  CXL_MEM_COMMAND_ID_MAX);
 	up_write(&cxl_memdev_rwsem);
 }
-EXPORT_SYMBOL_NS_GPL(set_exclusive_cxl_commands, CXL);
+EXPORT_SYMBOL_NS_GPL(set_exclusive_cxl_commands, "CXL");
 
 /**
  * clear_exclusive_cxl_commands() - atomically enable user cxl commands
@@ -584,7 +584,7 @@ void clear_exclusive_cxl_commands(struct cxl_memdev_state *mds,
 		      CXL_MEM_COMMAND_ID_MAX);
 	up_write(&cxl_memdev_rwsem);
 }
-EXPORT_SYMBOL_NS_GPL(clear_exclusive_cxl_commands, CXL);
+EXPORT_SYMBOL_NS_GPL(clear_exclusive_cxl_commands, "CXL");
 
 static void cxl_memdev_shutdown(struct device *dev)
 {
@@ -1006,7 +1006,7 @@ int devm_cxl_setup_fw_upload(struct device *host, struct cxl_memdev_state *mds)
 		return PTR_ERR(fwl);
 	return devm_add_action_or_reset(host, cxl_remove_fw_upload, fwl);
 }
-EXPORT_SYMBOL_NS_GPL(devm_cxl_setup_fw_upload, CXL);
+EXPORT_SYMBOL_NS_GPL(devm_cxl_setup_fw_upload, "CXL");
 
 static const struct file_operations cxl_memdev_fops = {
 	.owner = THIS_MODULE,
@@ -1060,7 +1060,7 @@ err:
 	put_device(dev);
 	return ERR_PTR(rc);
 }
-EXPORT_SYMBOL_NS_GPL(devm_cxl_add_memdev, CXL);
+EXPORT_SYMBOL_NS_GPL(devm_cxl_add_memdev, "CXL");
 
 static void sanitize_teardown_notifier(void *data)
 {
@@ -1105,7 +1105,7 @@ int devm_cxl_sanitize_setup_notifier(struct device *host,
 
 	return devm_add_action_or_reset(host, sanitize_teardown_notifier, mds);
 }
-EXPORT_SYMBOL_NS_GPL(devm_cxl_sanitize_setup_notifier, CXL);
+EXPORT_SYMBOL_NS_GPL(devm_cxl_sanitize_setup_notifier, "CXL");
 
 __init int cxl_memdev_init(void)
 {
diff --git a/drivers/cxl/core/pci.c b/drivers/cxl/core/pci.c
index 5b46bc46aaa9..9d58ab9d33c5 100644
--- a/drivers/cxl/core/pci.c
+++ b/drivers/cxl/core/pci.c
@@ -101,7 +101,7 @@ int devm_cxl_port_enumerate_dports(struct cxl_port *port)
 		return ctx.error;
 	return ctx.count;
 }
-EXPORT_SYMBOL_NS_GPL(devm_cxl_port_enumerate_dports, CXL);
+EXPORT_SYMBOL_NS_GPL(devm_cxl_port_enumerate_dports, "CXL");
 
 static int cxl_dvsec_mem_range_valid(struct cxl_dev_state *cxlds, int id)
 {
@@ -209,7 +209,7 @@ int cxl_await_media_ready(struct cxl_dev_state *cxlds)
 
 	return 0;
 }
-EXPORT_SYMBOL_NS_GPL(cxl_await_media_ready, CXL);
+EXPORT_SYMBOL_NS_GPL(cxl_await_media_ready, "CXL");
 
 static int cxl_set_mem_enable(struct cxl_dev_state *cxlds, u16 val)
 {
@@ -386,7 +386,7 @@ int cxl_dvsec_rr_decode(struct device *dev, struct cxl_port *port,
 
 	return 0;
 }
-EXPORT_SYMBOL_NS_GPL(cxl_dvsec_rr_decode, CXL);
+EXPORT_SYMBOL_NS_GPL(cxl_dvsec_rr_decode, "CXL");
 
 /**
  * cxl_hdm_decode_init() - Setup HDM decoding for the endpoint
@@ -464,7 +464,7 @@ int cxl_hdm_decode_init(struct cxl_dev_state *cxlds, struct cxl_hdm *cxlhdm,
 	 */
 	return 0;
 }
-EXPORT_SYMBOL_NS_GPL(cxl_hdm_decode_init, CXL);
+EXPORT_SYMBOL_NS_GPL(cxl_hdm_decode_init, "CXL");
 
 #define CXL_DOE_TABLE_ACCESS_REQ_CODE		0x000000ff
 #define   CXL_DOE_TABLE_ACCESS_REQ_CODE_READ	0
@@ -648,7 +648,7 @@ err:
 	devm_kfree(dev, buf);
 	dev_err(dev, "Failed to read/validate CDAT.\n");
 }
-EXPORT_SYMBOL_NS_GPL(read_cdat_data, CXL);
+EXPORT_SYMBOL_NS_GPL(read_cdat_data, "CXL");
 
 static void __cxl_handle_cor_ras(struct cxl_dev_state *cxlds,
 				 void __iomem *ras_base)
@@ -805,7 +805,7 @@ void cxl_dport_init_ras_reporting(struct cxl_dport *dport, struct device *host)
 		cxl_disable_rch_root_ints(dport);
 	}
 }
-EXPORT_SYMBOL_NS_GPL(cxl_dport_init_ras_reporting, CXL);
+EXPORT_SYMBOL_NS_GPL(cxl_dport_init_ras_reporting, "CXL");
 
 static void cxl_handle_rdport_cor_ras(struct cxl_dev_state *cxlds,
 					  struct cxl_dport *dport)
@@ -916,7 +916,7 @@ void cxl_cor_error_detected(struct pci_dev *pdev)
 		cxl_handle_endpoint_cor_ras(cxlds);
 	}
 }
-EXPORT_SYMBOL_NS_GPL(cxl_cor_error_detected, CXL);
+EXPORT_SYMBOL_NS_GPL(cxl_cor_error_detected, "CXL");
 
 pci_ers_result_t cxl_error_detected(struct pci_dev *pdev,
 				    pci_channel_state_t state)
@@ -966,7 +966,7 @@ pci_ers_result_t cxl_error_detected(struct pci_dev *pdev,
 	}
 	return PCI_ERS_RESULT_NEED_RESET;
 }
-EXPORT_SYMBOL_NS_GPL(cxl_error_detected, CXL);
+EXPORT_SYMBOL_NS_GPL(cxl_error_detected, "CXL");
 
 static int cxl_flit_size(struct pci_dev *pdev)
 {
@@ -1030,7 +1030,7 @@ bool cxl_endpoint_decoder_reset_detected(struct cxl_port *port)
 	return device_for_each_child(&port->dev, port,
 				     __cxl_endpoint_decoder_reset_detected);
 }
-EXPORT_SYMBOL_NS_GPL(cxl_endpoint_decoder_reset_detected, CXL);
+EXPORT_SYMBOL_NS_GPL(cxl_endpoint_decoder_reset_detected, "CXL");
 
 int cxl_pci_get_bandwidth(struct pci_dev *pdev, struct access_coordinate *c)
 {
diff --git a/drivers/cxl/core/pmem.c b/drivers/cxl/core/pmem.c
index c00f3a933164..b3378d3f6acb 100644
--- a/drivers/cxl/core/pmem.c
+++ b/drivers/cxl/core/pmem.c
@@ -49,13 +49,13 @@ struct cxl_nvdimm_bridge *to_cxl_nvdimm_bridge(struct device *dev)
 		return NULL;
 	return container_of(dev, struct cxl_nvdimm_bridge, dev);
 }
-EXPORT_SYMBOL_NS_GPL(to_cxl_nvdimm_bridge, CXL);
+EXPORT_SYMBOL_NS_GPL(to_cxl_nvdimm_bridge, "CXL");
 
 bool is_cxl_nvdimm_bridge(struct device *dev)
 {
 	return dev->type == &cxl_nvdimm_bridge_type;
 }
-EXPORT_SYMBOL_NS_GPL(is_cxl_nvdimm_bridge, CXL);
+EXPORT_SYMBOL_NS_GPL(is_cxl_nvdimm_bridge, "CXL");
 
 static int match_nvdimm_bridge(struct device *dev, void *data)
 {
@@ -82,7 +82,7 @@ struct cxl_nvdimm_bridge *cxl_find_nvdimm_bridge(struct cxl_port *port)
 
 	return to_cxl_nvdimm_bridge(dev);
 }
-EXPORT_SYMBOL_NS_GPL(cxl_find_nvdimm_bridge, CXL);
+EXPORT_SYMBOL_NS_GPL(cxl_find_nvdimm_bridge, "CXL");
 
 static struct lock_class_key cxl_nvdimm_bridge_key;
 
@@ -164,7 +164,7 @@ err:
 	put_device(dev);
 	return ERR_PTR(rc);
 }
-EXPORT_SYMBOL_NS_GPL(devm_cxl_add_nvdimm_bridge, CXL);
+EXPORT_SYMBOL_NS_GPL(devm_cxl_add_nvdimm_bridge, "CXL");
 
 static void cxl_nvdimm_release(struct device *dev)
 {
@@ -188,7 +188,7 @@ bool is_cxl_nvdimm(struct device *dev)
 {
 	return dev->type == &cxl_nvdimm_type;
 }
-EXPORT_SYMBOL_NS_GPL(is_cxl_nvdimm, CXL);
+EXPORT_SYMBOL_NS_GPL(is_cxl_nvdimm, "CXL");
 
 struct cxl_nvdimm *to_cxl_nvdimm(struct device *dev)
 {
@@ -197,7 +197,7 @@ struct cxl_nvdimm *to_cxl_nvdimm(struct device *dev)
 		return NULL;
 	return container_of(dev, struct cxl_nvdimm, dev);
 }
-EXPORT_SYMBOL_NS_GPL(to_cxl_nvdimm, CXL);
+EXPORT_SYMBOL_NS_GPL(to_cxl_nvdimm, "CXL");
 
 static struct lock_class_key cxl_nvdimm_key;
 
@@ -293,4 +293,4 @@ err_alloc:
 
 	return rc;
 }
-EXPORT_SYMBOL_NS_GPL(devm_cxl_add_nvdimm, CXL);
+EXPORT_SYMBOL_NS_GPL(devm_cxl_add_nvdimm, "CXL");
diff --git a/drivers/cxl/core/pmu.c b/drivers/cxl/core/pmu.c
index 5d8e06b0ba6e..b3136d7664ab 100644
--- a/drivers/cxl/core/pmu.c
+++ b/drivers/cxl/core/pmu.c
@@ -65,4 +65,4 @@ err:
 	put_device(&pmu->dev);
 	return rc;
 }
-EXPORT_SYMBOL_NS_GPL(devm_cxl_pmu_add, CXL);
+EXPORT_SYMBOL_NS_GPL(devm_cxl_pmu_add, "CXL");
diff --git a/drivers/cxl/core/port.c b/drivers/cxl/core/port.c
index af92c67bc954..78a5c2c25982 100644
--- a/drivers/cxl/core/port.c
+++ b/drivers/cxl/core/port.c
@@ -437,7 +437,7 @@ struct cxl_root_decoder *to_cxl_root_decoder(struct device *dev)
 		return NULL;
 	return container_of(dev, struct cxl_root_decoder, cxlsd.cxld.dev);
 }
-EXPORT_SYMBOL_NS_GPL(to_cxl_root_decoder, CXL);
+EXPORT_SYMBOL_NS_GPL(to_cxl_root_decoder, "CXL");
 
 static void cxl_root_decoder_release(struct device *dev)
 {
@@ -471,19 +471,19 @@ bool is_endpoint_decoder(struct device *dev)
 {
 	return dev->type == &cxl_decoder_endpoint_type;
 }
-EXPORT_SYMBOL_NS_GPL(is_endpoint_decoder, CXL);
+EXPORT_SYMBOL_NS_GPL(is_endpoint_decoder, "CXL");
 
 bool is_root_decoder(struct device *dev)
 {
 	return dev->type == &cxl_decoder_root_type;
 }
-EXPORT_SYMBOL_NS_GPL(is_root_decoder, CXL);
+EXPORT_SYMBOL_NS_GPL(is_root_decoder, "CXL");
 
 bool is_switch_decoder(struct device *dev)
 {
 	return is_root_decoder(dev) || dev->type == &cxl_decoder_switch_type;
 }
-EXPORT_SYMBOL_NS_GPL(is_switch_decoder, CXL);
+EXPORT_SYMBOL_NS_GPL(is_switch_decoder, "CXL");
 
 struct cxl_decoder *to_cxl_decoder(struct device *dev)
 {
@@ -493,7 +493,7 @@ struct cxl_decoder *to_cxl_decoder(struct device *dev)
 		return NULL;
 	return container_of(dev, struct cxl_decoder, dev);
 }
-EXPORT_SYMBOL_NS_GPL(to_cxl_decoder, CXL);
+EXPORT_SYMBOL_NS_GPL(to_cxl_decoder, "CXL");
 
 struct cxl_endpoint_decoder *to_cxl_endpoint_decoder(struct device *dev)
 {
@@ -502,7 +502,7 @@ struct cxl_endpoint_decoder *to_cxl_endpoint_decoder(struct device *dev)
 		return NULL;
 	return container_of(dev, struct cxl_endpoint_decoder, cxld.dev);
 }
-EXPORT_SYMBOL_NS_GPL(to_cxl_endpoint_decoder, CXL);
+EXPORT_SYMBOL_NS_GPL(to_cxl_endpoint_decoder, "CXL");
 
 struct cxl_switch_decoder *to_cxl_switch_decoder(struct device *dev)
 {
@@ -511,7 +511,7 @@ struct cxl_switch_decoder *to_cxl_switch_decoder(struct device *dev)
 		return NULL;
 	return container_of(dev, struct cxl_switch_decoder, cxld.dev);
 }
-EXPORT_SYMBOL_NS_GPL(to_cxl_switch_decoder, CXL);
+EXPORT_SYMBOL_NS_GPL(to_cxl_switch_decoder, "CXL");
 
 static void cxl_ep_release(struct cxl_ep *ep)
 {
@@ -585,7 +585,7 @@ bool is_cxl_port(const struct device *dev)
 {
 	return dev->type == &cxl_port_type;
 }
-EXPORT_SYMBOL_NS_GPL(is_cxl_port, CXL);
+EXPORT_SYMBOL_NS_GPL(is_cxl_port, "CXL");
 
 struct cxl_port *to_cxl_port(const struct device *dev)
 {
@@ -594,7 +594,7 @@ struct cxl_port *to_cxl_port(const struct device *dev)
 		return NULL;
 	return container_of(dev, struct cxl_port, dev);
 }
-EXPORT_SYMBOL_NS_GPL(to_cxl_port, CXL);
+EXPORT_SYMBOL_NS_GPL(to_cxl_port, "CXL");
 
 static void unregister_port(void *_port)
 {
@@ -942,7 +942,7 @@ struct cxl_port *devm_cxl_add_port(struct device *host,
 
 	return port;
 }
-EXPORT_SYMBOL_NS_GPL(devm_cxl_add_port, CXL);
+EXPORT_SYMBOL_NS_GPL(devm_cxl_add_port, "CXL");
 
 struct cxl_root *devm_cxl_add_root(struct device *host,
 				   const struct cxl_root_ops *ops)
@@ -958,7 +958,7 @@ struct cxl_root *devm_cxl_add_root(struct device *host,
 	cxl_root->ops = ops;
 	return cxl_root;
 }
-EXPORT_SYMBOL_NS_GPL(devm_cxl_add_root, CXL);
+EXPORT_SYMBOL_NS_GPL(devm_cxl_add_root, "CXL");
 
 struct pci_bus *cxl_port_to_pci_bus(struct cxl_port *port)
 {
@@ -974,7 +974,7 @@ struct pci_bus *cxl_port_to_pci_bus(struct cxl_port *port)
 
 	return xa_load(&cxl_root_buses, (unsigned long)port->uport_dev);
 }
-EXPORT_SYMBOL_NS_GPL(cxl_port_to_pci_bus, CXL);
+EXPORT_SYMBOL_NS_GPL(cxl_port_to_pci_bus, "CXL");
 
 static void unregister_pci_bus(void *uport_dev)
 {
@@ -995,7 +995,7 @@ int devm_cxl_register_pci_bus(struct device *host, struct device *uport_dev,
 		return rc;
 	return devm_add_action_or_reset(host, unregister_pci_bus, uport_dev);
 }
-EXPORT_SYMBOL_NS_GPL(devm_cxl_register_pci_bus, CXL);
+EXPORT_SYMBOL_NS_GPL(devm_cxl_register_pci_bus, "CXL");
 
 static bool dev_is_cxl_root_child(struct device *dev)
 {
@@ -1027,7 +1027,7 @@ struct cxl_root *find_cxl_root(struct cxl_port *port)
 	get_device(&iter->dev);
 	return to_cxl_root(iter);
 }
-EXPORT_SYMBOL_NS_GPL(find_cxl_root, CXL);
+EXPORT_SYMBOL_NS_GPL(find_cxl_root, "CXL");
 
 void put_cxl_root(struct cxl_root *cxl_root)
 {
@@ -1036,7 +1036,7 @@ void put_cxl_root(struct cxl_root *cxl_root)
 
 	put_device(&cxl_root->port.dev);
 }
-EXPORT_SYMBOL_NS_GPL(put_cxl_root, CXL);
+EXPORT_SYMBOL_NS_GPL(put_cxl_root, "CXL");
 
 static struct cxl_dport *find_dport(struct cxl_port *port, int id)
 {
@@ -1230,7 +1230,7 @@ struct cxl_dport *devm_cxl_add_dport(struct cxl_port *port,
 
 	return dport;
 }
-EXPORT_SYMBOL_NS_GPL(devm_cxl_add_dport, CXL);
+EXPORT_SYMBOL_NS_GPL(devm_cxl_add_dport, "CXL");
 
 /**
  * devm_cxl_add_rch_dport - append RCH downstream port data to a cxl_port
@@ -1264,7 +1264,7 @@ struct cxl_dport *devm_cxl_add_rch_dport(struct cxl_port *port,
 
 	return dport;
 }
-EXPORT_SYMBOL_NS_GPL(devm_cxl_add_rch_dport, CXL);
+EXPORT_SYMBOL_NS_GPL(devm_cxl_add_rch_dport, "CXL");
 
 static int add_ep(struct cxl_ep *new)
 {
@@ -1421,7 +1421,7 @@ int cxl_endpoint_autoremove(struct cxl_memdev *cxlmd, struct cxl_port *endpoint)
 	cxlmd->depth = endpoint->depth;
 	return devm_add_action_or_reset(dev, delete_endpoint, cxlmd);
 }
-EXPORT_SYMBOL_NS_GPL(cxl_endpoint_autoremove, CXL);
+EXPORT_SYMBOL_NS_GPL(cxl_endpoint_autoremove, "CXL");
 
 /*
  * The natural end of life of a non-root 'cxl_port' is when its parent port goes
@@ -1692,21 +1692,21 @@ retry:
 
 	return 0;
 }
-EXPORT_SYMBOL_NS_GPL(devm_cxl_enumerate_ports, CXL);
+EXPORT_SYMBOL_NS_GPL(devm_cxl_enumerate_ports, "CXL");
 
 struct cxl_port *cxl_pci_find_port(struct pci_dev *pdev,
 				   struct cxl_dport **dport)
 {
 	return find_cxl_port(pdev->dev.parent, dport);
 }
-EXPORT_SYMBOL_NS_GPL(cxl_pci_find_port, CXL);
+EXPORT_SYMBOL_NS_GPL(cxl_pci_find_port, "CXL");
 
 struct cxl_port *cxl_mem_find_port(struct cxl_memdev *cxlmd,
 				   struct cxl_dport **dport)
 {
 	return find_cxl_port(grandparent(&cxlmd->dev), dport);
 }
-EXPORT_SYMBOL_NS_GPL(cxl_mem_find_port, CXL);
+EXPORT_SYMBOL_NS_GPL(cxl_mem_find_port, "CXL");
 
 static int decoder_populate_targets(struct cxl_switch_decoder *cxlsd,
 				    struct cxl_port *port, int *target_map)
@@ -1840,7 +1840,7 @@ struct cxl_root_decoder *cxl_root_decoder_alloc(struct cxl_port *port,
 	cxlrd->qos_class = CXL_QOS_CLASS_INVALID;
 	return cxlrd;
 }
-EXPORT_SYMBOL_NS_GPL(cxl_root_decoder_alloc, CXL);
+EXPORT_SYMBOL_NS_GPL(cxl_root_decoder_alloc, "CXL");
 
 /**
  * cxl_switch_decoder_alloc - Allocate a switch level decoder
@@ -1877,7 +1877,7 @@ struct cxl_switch_decoder *cxl_switch_decoder_alloc(struct cxl_port *port,
 	cxld->dev.type = &cxl_decoder_switch_type;
 	return cxlsd;
 }
-EXPORT_SYMBOL_NS_GPL(cxl_switch_decoder_alloc, CXL);
+EXPORT_SYMBOL_NS_GPL(cxl_switch_decoder_alloc, "CXL");
 
 /**
  * cxl_endpoint_decoder_alloc - Allocate an endpoint decoder
@@ -1909,7 +1909,7 @@ struct cxl_endpoint_decoder *cxl_endpoint_decoder_alloc(struct cxl_port *port)
 	cxld->dev.type = &cxl_decoder_endpoint_type;
 	return cxled;
 }
-EXPORT_SYMBOL_NS_GPL(cxl_endpoint_decoder_alloc, CXL);
+EXPORT_SYMBOL_NS_GPL(cxl_endpoint_decoder_alloc, "CXL");
 
 /**
  * cxl_decoder_add_locked - Add a decoder with targets
@@ -1965,7 +1965,7 @@ int cxl_decoder_add_locked(struct cxl_decoder *cxld, int *target_map)
 
 	return device_add(dev);
 }
-EXPORT_SYMBOL_NS_GPL(cxl_decoder_add_locked, CXL);
+EXPORT_SYMBOL_NS_GPL(cxl_decoder_add_locked, "CXL");
 
 /**
  * cxl_decoder_add - Add a decoder with targets
@@ -1995,7 +1995,7 @@ int cxl_decoder_add(struct cxl_decoder *cxld, int *target_map)
 	guard(device)(&port->dev);
 	return cxl_decoder_add_locked(cxld, target_map);
 }
-EXPORT_SYMBOL_NS_GPL(cxl_decoder_add, CXL);
+EXPORT_SYMBOL_NS_GPL(cxl_decoder_add, "CXL");
 
 static void cxld_unregister(void *dev)
 {
@@ -2013,7 +2013,7 @@ int cxl_decoder_autoremove(struct device *host, struct cxl_decoder *cxld)
 {
 	return devm_add_action_or_reset(host, cxld_unregister, &cxld->dev);
 }
-EXPORT_SYMBOL_NS_GPL(cxl_decoder_autoremove, CXL);
+EXPORT_SYMBOL_NS_GPL(cxl_decoder_autoremove, "CXL");
 
 /**
  * __cxl_driver_register - register a driver for the cxl bus
@@ -2046,13 +2046,13 @@ int __cxl_driver_register(struct cxl_driver *cxl_drv, struct module *owner,
 
 	return driver_register(&cxl_drv->drv);
 }
-EXPORT_SYMBOL_NS_GPL(__cxl_driver_register, CXL);
+EXPORT_SYMBOL_NS_GPL(__cxl_driver_register, "CXL");
 
 void cxl_driver_unregister(struct cxl_driver *cxl_drv)
 {
 	driver_unregister(&cxl_drv->drv);
 }
-EXPORT_SYMBOL_NS_GPL(cxl_driver_unregister, CXL);
+EXPORT_SYMBOL_NS_GPL(cxl_driver_unregister, "CXL");
 
 static int cxl_bus_uevent(const struct device *dev, struct kobj_uevent_env *env)
 {
@@ -2104,19 +2104,19 @@ void cxl_bus_rescan(void)
 
 	queue_work(cxl_bus_wq, &rescan_work);
 }
-EXPORT_SYMBOL_NS_GPL(cxl_bus_rescan, CXL);
+EXPORT_SYMBOL_NS_GPL(cxl_bus_rescan, "CXL");
 
 void cxl_bus_drain(void)
 {
 	drain_workqueue(cxl_bus_wq);
 }
-EXPORT_SYMBOL_NS_GPL(cxl_bus_drain, CXL);
+EXPORT_SYMBOL_NS_GPL(cxl_bus_drain, "CXL");
 
 bool schedule_cxl_memdev_detach(struct cxl_memdev *cxlmd)
 {
 	return queue_work(cxl_bus_wq, &cxlmd->detach_work);
 }
-EXPORT_SYMBOL_NS_GPL(schedule_cxl_memdev_detach, CXL);
+EXPORT_SYMBOL_NS_GPL(schedule_cxl_memdev_detach, "CXL");
 
 static void add_latency(struct access_coordinate *c, long latency)
 {
@@ -2242,7 +2242,7 @@ int cxl_endpoint_get_perf_coordinates(struct cxl_port *port,
 
 	return 0;
 }
-EXPORT_SYMBOL_NS_GPL(cxl_endpoint_get_perf_coordinates, CXL);
+EXPORT_SYMBOL_NS_GPL(cxl_endpoint_get_perf_coordinates, "CXL");
 
 int cxl_port_get_switch_dport_bandwidth(struct cxl_port *port,
 					struct access_coordinate *c)
@@ -2299,7 +2299,7 @@ struct bus_type cxl_bus_type = {
 	.remove = cxl_bus_remove,
 	.bus_groups = cxl_bus_attribute_groups,
 };
-EXPORT_SYMBOL_NS_GPL(cxl_bus_type, CXL);
+EXPORT_SYMBOL_NS_GPL(cxl_bus_type, "CXL");
 
 static struct dentry *cxl_debugfs;
 
@@ -2307,7 +2307,7 @@ struct dentry *cxl_debugfs_create_dir(const char *dir)
 {
 	return debugfs_create_dir(dir, cxl_debugfs);
 }
-EXPORT_SYMBOL_NS_GPL(cxl_debugfs_create_dir, CXL);
+EXPORT_SYMBOL_NS_GPL(cxl_debugfs_create_dir, "CXL");
 
 static __init int cxl_core_init(void)
 {
@@ -2363,4 +2363,4 @@ subsys_initcall(cxl_core_init);
 module_exit(cxl_core_exit);
 MODULE_DESCRIPTION("CXL: Core Compute Express Link support");
 MODULE_LICENSE("GPL v2");
-MODULE_IMPORT_NS(CXL);
+MODULE_IMPORT_NS("CXL");
diff --git a/drivers/cxl/core/region.c b/drivers/cxl/core/region.c
index dff618c708dc..b98b1ccffd1c 100644
--- a/drivers/cxl/core/region.c
+++ b/drivers/cxl/core/region.c
@@ -1295,6 +1295,7 @@ static int cxl_port_setup_targets(struct cxl_port *port,
 	struct cxl_region_params *p = &cxlr->params;
 	struct cxl_decoder *cxld = cxl_rr->decoder;
 	struct cxl_switch_decoder *cxlsd;
+	struct cxl_port *iter = port;
 	u16 eig, peig;
 	u8 eiw, peiw;
 
@@ -1311,16 +1312,26 @@ static int cxl_port_setup_targets(struct cxl_port *port,
 
 	cxlsd = to_cxl_switch_decoder(&cxld->dev);
 	if (cxl_rr->nr_targets_set) {
-		int i, distance;
+		int i, distance = 1;
+		struct cxl_region_ref *cxl_rr_iter;
 
 		/*
-		 * Passthrough decoders impose no distance requirements between
-		 * peers
+		 * The "distance" between peer downstream ports represents which
+		 * endpoint positions in the region interleave a given port can
+		 * host.
+		 *
+		 * For example, at the root of a hierarchy the distance is
+		 * always 1 as every index targets a different host-bridge. At
+		 * each subsequent switch level those ports map every Nth region
+		 * position where N is the width of the switch == distance.
 		 */
-		if (cxl_rr->nr_targets == 1)
-			distance = 0;
-		else
-			distance = p->nr_targets / cxl_rr->nr_targets;
+		do {
+			cxl_rr_iter = cxl_rr_load(iter, cxlr);
+			distance *= cxl_rr_iter->nr_targets;
+			iter = to_cxl_port(iter->dev.parent);
+		} while (!is_cxl_root(iter));
+		distance *= cxlrd->cxlsd.cxld.interleave_ways;
+
 		for (i = 0; i < cxl_rr->nr_targets_set; i++)
 			if (ep->dport == cxlsd->target[i]) {
 				rc = check_last_peer(cxled, ep, cxl_rr,
@@ -2299,7 +2310,7 @@ bool is_cxl_region(struct device *dev)
 {
 	return dev->type == &cxl_region_type;
 }
-EXPORT_SYMBOL_NS_GPL(is_cxl_region, CXL);
+EXPORT_SYMBOL_NS_GPL(is_cxl_region, "CXL");
 
 static struct cxl_region *to_cxl_region(struct device *dev)
 {
@@ -2537,9 +2548,8 @@ static struct cxl_region *__create_region(struct cxl_root_decoder *cxlrd,
 	return devm_cxl_add_region(cxlrd, id, mode, CXL_DECODER_HOSTONLYMEM);
 }
 
-static ssize_t create_pmem_region_store(struct device *dev,
-					struct device_attribute *attr,
-					const char *buf, size_t len)
+static ssize_t create_region_store(struct device *dev, const char *buf,
+				   size_t len, enum cxl_decoder_mode mode)
 {
 	struct cxl_root_decoder *cxlrd = to_cxl_root_decoder(dev);
 	struct cxl_region *cxlr;
@@ -2549,31 +2559,26 @@ static ssize_t create_pmem_region_store(struct device *dev,
 	if (rc != 1)
 		return -EINVAL;
 
-	cxlr = __create_region(cxlrd, CXL_DECODER_PMEM, id);
+	cxlr = __create_region(cxlrd, mode, id);
 	if (IS_ERR(cxlr))
 		return PTR_ERR(cxlr);
 
 	return len;
 }
+
+static ssize_t create_pmem_region_store(struct device *dev,
+					struct device_attribute *attr,
+					const char *buf, size_t len)
+{
+	return create_region_store(dev, buf, len, CXL_DECODER_PMEM);
+}
 DEVICE_ATTR_RW(create_pmem_region);
 
 static ssize_t create_ram_region_store(struct device *dev,
 				       struct device_attribute *attr,
 				       const char *buf, size_t len)
 {
-	struct cxl_root_decoder *cxlrd = to_cxl_root_decoder(dev);
-	struct cxl_region *cxlr;
-	int rc, id;
-
-	rc = sscanf(buf, "region%d\n", &id);
-	if (rc != 1)
-		return -EINVAL;
-
-	cxlr = __create_region(cxlrd, CXL_DECODER_RAM, id);
-	if (IS_ERR(cxlr))
-		return PTR_ERR(cxlr);
-
-	return len;
+	return create_region_store(dev, buf, len, CXL_DECODER_RAM);
 }
 DEVICE_ATTR_RW(create_ram_region);
 
@@ -2658,7 +2663,7 @@ bool is_cxl_pmem_region(struct device *dev)
 {
 	return dev->type == &cxl_pmem_region_type;
 }
-EXPORT_SYMBOL_NS_GPL(is_cxl_pmem_region, CXL);
+EXPORT_SYMBOL_NS_GPL(is_cxl_pmem_region, "CXL");
 
 struct cxl_pmem_region *to_cxl_pmem_region(struct device *dev)
 {
@@ -2667,7 +2672,7 @@ struct cxl_pmem_region *to_cxl_pmem_region(struct device *dev)
 		return NULL;
 	return container_of(dev, struct cxl_pmem_region, dev);
 }
-EXPORT_SYMBOL_NS_GPL(to_cxl_pmem_region, CXL);
+EXPORT_SYMBOL_NS_GPL(to_cxl_pmem_region, "CXL");
 
 struct cxl_poison_context {
 	struct cxl_port *port;
@@ -3021,7 +3026,7 @@ struct cxl_dax_region *to_cxl_dax_region(struct device *dev)
 		return NULL;
 	return container_of(dev, struct cxl_dax_region, dev);
 }
-EXPORT_SYMBOL_NS_GPL(to_cxl_dax_region, CXL);
+EXPORT_SYMBOL_NS_GPL(to_cxl_dax_region, "CXL");
 
 static struct lock_class_key cxl_dax_region_key;
 
@@ -3365,7 +3370,7 @@ out:
 	put_device(cxlrd_dev);
 	return rc;
 }
-EXPORT_SYMBOL_NS_GPL(cxl_add_to_region, CXL);
+EXPORT_SYMBOL_NS_GPL(cxl_add_to_region, "CXL");
 
 static int is_system_ram(struct resource *res, void *arg)
 {
@@ -3468,6 +3473,6 @@ void cxl_region_exit(void)
 	cxl_driver_unregister(&cxl_region_driver);
 }
 
-MODULE_IMPORT_NS(CXL);
-MODULE_IMPORT_NS(DEVMEM);
+MODULE_IMPORT_NS("CXL");
+MODULE_IMPORT_NS("DEVMEM");
 MODULE_ALIAS_CXL(CXL_DEVICE_REGION);
diff --git a/drivers/cxl/core/regs.c b/drivers/cxl/core/regs.c
index e1082e749c69..59cb35b40c7e 100644
--- a/drivers/cxl/core/regs.c
+++ b/drivers/cxl/core/regs.c
@@ -52,7 +52,7 @@ void cxl_probe_component_regs(struct device *dev, void __iomem *base,
 	cap_array = readl(base + CXL_CM_CAP_HDR_OFFSET);
 
 	if (FIELD_GET(CXL_CM_CAP_HDR_ID_MASK, cap_array) != CM_CAP_HDR_CAP_ID) {
-		dev_err(dev,
+		dev_dbg(dev,
 			"Couldn't locate the CXL.cache and CXL.mem capability array header.\n");
 		return;
 	}
@@ -106,7 +106,7 @@ void cxl_probe_component_regs(struct device *dev, void __iomem *base,
 		rmap->size = length;
 	}
 }
-EXPORT_SYMBOL_NS_GPL(cxl_probe_component_regs, CXL);
+EXPORT_SYMBOL_NS_GPL(cxl_probe_component_regs, "CXL");
 
 /**
  * cxl_probe_device_regs() - Detect CXL Device register blocks
@@ -174,7 +174,7 @@ void cxl_probe_device_regs(struct device *dev, void __iomem *base,
 		rmap->size = length;
 	}
 }
-EXPORT_SYMBOL_NS_GPL(cxl_probe_device_regs, CXL);
+EXPORT_SYMBOL_NS_GPL(cxl_probe_device_regs, "CXL");
 
 void __iomem *devm_cxl_iomap_block(struct device *dev, resource_size_t addr,
 				   resource_size_t length)
@@ -232,7 +232,7 @@ int cxl_map_component_regs(const struct cxl_register_map *map,
 
 	return 0;
 }
-EXPORT_SYMBOL_NS_GPL(cxl_map_component_regs, CXL);
+EXPORT_SYMBOL_NS_GPL(cxl_map_component_regs, "CXL");
 
 int cxl_map_device_regs(const struct cxl_register_map *map,
 			struct cxl_device_regs *regs)
@@ -266,7 +266,7 @@ int cxl_map_device_regs(const struct cxl_register_map *map,
 
 	return 0;
 }
-EXPORT_SYMBOL_NS_GPL(cxl_map_device_regs, CXL);
+EXPORT_SYMBOL_NS_GPL(cxl_map_device_regs, "CXL");
 
 static bool cxl_decode_regblock(struct pci_dev *pdev, u32 reg_lo, u32 reg_hi,
 				struct cxl_register_map *map)
@@ -344,7 +344,7 @@ int cxl_find_regblock_instance(struct pci_dev *pdev, enum cxl_regloc_type type,
 	map->resource = CXL_RESOURCE_NONE;
 	return -ENODEV;
 }
-EXPORT_SYMBOL_NS_GPL(cxl_find_regblock_instance, CXL);
+EXPORT_SYMBOL_NS_GPL(cxl_find_regblock_instance, "CXL");
 
 /**
  * cxl_find_regblock() - Locate register blocks by type
@@ -362,7 +362,7 @@ int cxl_find_regblock(struct pci_dev *pdev, enum cxl_regloc_type type,
 {
 	return cxl_find_regblock_instance(pdev, type, map, 0);
 }
-EXPORT_SYMBOL_NS_GPL(cxl_find_regblock, CXL);
+EXPORT_SYMBOL_NS_GPL(cxl_find_regblock, "CXL");
 
 /**
  * cxl_count_regblock() - Count instances of a given regblock type.
@@ -385,7 +385,7 @@ int cxl_count_regblock(struct pci_dev *pdev, enum cxl_regloc_type type)
 		count++;
 	}
 }
-EXPORT_SYMBOL_NS_GPL(cxl_count_regblock, CXL);
+EXPORT_SYMBOL_NS_GPL(cxl_count_regblock, "CXL");
 
 int cxl_map_pmu_regs(struct cxl_register_map *map, struct cxl_pmu_regs *regs)
 {
@@ -399,7 +399,7 @@ int cxl_map_pmu_regs(struct cxl_register_map *map, struct cxl_pmu_regs *regs)
 
 	return 0;
 }
-EXPORT_SYMBOL_NS_GPL(cxl_map_pmu_regs, CXL);
+EXPORT_SYMBOL_NS_GPL(cxl_map_pmu_regs, "CXL");
 
 static int cxl_map_regblock(struct cxl_register_map *map)
 {
@@ -468,7 +468,7 @@ int cxl_setup_regs(struct cxl_register_map *map)
 
 	return rc;
 }
-EXPORT_SYMBOL_NS_GPL(cxl_setup_regs, CXL);
+EXPORT_SYMBOL_NS_GPL(cxl_setup_regs, "CXL");
 
 u16 cxl_rcrb_to_aer(struct device *dev, resource_size_t rcrb)
 {
@@ -506,6 +506,62 @@ out:
 	return offset;
 }
 
+static resource_size_t cxl_rcrb_to_linkcap(struct device *dev, struct cxl_dport *dport)
+{
+	resource_size_t rcrb = dport->rcrb.base;
+	void __iomem *addr;
+	u32 cap_hdr;
+	u16 offset;
+
+	if (!request_mem_region(rcrb, SZ_4K, "CXL RCRB"))
+		return CXL_RESOURCE_NONE;
+
+	addr = ioremap(rcrb, SZ_4K);
+	if (!addr) {
+		dev_err(dev, "Failed to map region %pr\n", addr);
+		release_mem_region(rcrb, SZ_4K);
+		return CXL_RESOURCE_NONE;
+	}
+
+	offset = FIELD_GET(PCI_RCRB_CAP_LIST_ID_MASK, readw(addr + PCI_CAPABILITY_LIST));
+	cap_hdr = readl(addr + offset);
+	while ((FIELD_GET(PCI_RCRB_CAP_HDR_ID_MASK, cap_hdr)) != PCI_CAP_ID_EXP) {
+		offset = FIELD_GET(PCI_RCRB_CAP_HDR_NEXT_MASK, cap_hdr);
+		if (offset == 0 || offset > SZ_4K) {
+			offset = 0;
+			break;
+		}
+		cap_hdr = readl(addr + offset);
+	}
+
+	iounmap(addr);
+	release_mem_region(rcrb, SZ_4K);
+	if (!offset)
+		return CXL_RESOURCE_NONE;
+
+	return offset;
+}
+
+int cxl_dport_map_rcd_linkcap(struct pci_dev *pdev, struct cxl_dport *dport)
+{
+	void __iomem *dport_pcie_cap = NULL;
+	resource_size_t pos;
+	struct cxl_rcrb_info *ri;
+
+	ri = &dport->rcrb;
+	pos = cxl_rcrb_to_linkcap(&pdev->dev, dport);
+	if (pos == CXL_RESOURCE_NONE)
+		return -ENXIO;
+
+	dport_pcie_cap = devm_cxl_iomap_block(&pdev->dev,
+					      ri->base + pos,
+					      PCI_CAP_EXP_SIZEOF);
+	dport->regs.rcd_pcie_cap = dport_pcie_cap;
+
+	return 0;
+}
+EXPORT_SYMBOL_NS_GPL(cxl_dport_map_rcd_linkcap, "CXL");
+
 resource_size_t __rcrb_to_component(struct device *dev, struct cxl_rcrb_info *ri,
 				    enum cxl_rcrb which)
 {
@@ -577,4 +633,4 @@ resource_size_t cxl_rcd_component_reg_phys(struct device *dev,
 		return CXL_RESOURCE_NONE;
 	return __rcrb_to_component(dev, &dport->rcrb, CXL_RCRB_UPSTREAM);
 }
-EXPORT_SYMBOL_NS_GPL(cxl_rcd_component_reg_phys, CXL);
+EXPORT_SYMBOL_NS_GPL(cxl_rcd_component_reg_phys, "CXL");
diff --git a/drivers/cxl/core/suspend.c b/drivers/cxl/core/suspend.c
index a5984d96ea1d..29aa5cc5e565 100644
--- a/drivers/cxl/core/suspend.c
+++ b/drivers/cxl/core/suspend.c
@@ -15,10 +15,10 @@ void cxl_mem_active_inc(void)
 {
 	atomic_inc(&mem_active);
 }
-EXPORT_SYMBOL_NS_GPL(cxl_mem_active_inc, CXL);
+EXPORT_SYMBOL_NS_GPL(cxl_mem_active_inc, "CXL");
 
 void cxl_mem_active_dec(void)
 {
 	atomic_dec(&mem_active);
 }
-EXPORT_SYMBOL_NS_GPL(cxl_mem_active_dec, CXL);
+EXPORT_SYMBOL_NS_GPL(cxl_mem_active_dec, "CXL");
diff --git a/drivers/cxl/cxl.h b/drivers/cxl/cxl.h
index 5406e3ab3d4a..f6015f24ad38 100644
--- a/drivers/cxl/cxl.h
+++ b/drivers/cxl/cxl.h
@@ -235,6 +235,14 @@ struct cxl_regs {
 	struct_group_tagged(cxl_rch_regs, rch_regs,
 		void __iomem *dport_aer;
 	);
+
+	/*
+	 * RCD upstream port specific PCIe cap register
+	 * @pcie_cap: CXL 3.0 8.2.1.2 RCD Upstream Port RCRB
+	 */
+	struct_group_tagged(cxl_rcd_regs, rcd_regs,
+		void __iomem *rcd_pcie_cap;
+	);
 };
 
 struct cxl_reg_map {
@@ -304,6 +312,7 @@ int cxl_setup_regs(struct cxl_register_map *map);
 struct cxl_dport;
 resource_size_t cxl_rcd_component_reg_phys(struct device *dev,
 					   struct cxl_dport *dport);
+int cxl_dport_map_rcd_linkcap(struct pci_dev *pdev, struct cxl_dport *dport);
 
 #define CXL_RESOURCE_NONE ((resource_size_t) -1)
 #define CXL_TARGET_STRLEN 20
diff --git a/drivers/cxl/mem.c b/drivers/cxl/mem.c
index a9fd5cd5a0d2..2f03a4d5606e 100644
--- a/drivers/cxl/mem.c
+++ b/drivers/cxl/mem.c
@@ -252,7 +252,7 @@ module_cxl_driver(cxl_mem_driver);
 
 MODULE_DESCRIPTION("CXL: Memory Expansion");
 MODULE_LICENSE("GPL v2");
-MODULE_IMPORT_NS(CXL);
+MODULE_IMPORT_NS("CXL");
 MODULE_ALIAS_CXL(CXL_DEVICE_MEMORY_EXPANDER);
 /*
  * create_endpoint() wants to validate port driver attach immediately after
diff --git a/drivers/cxl/pci.c b/drivers/cxl/pci.c
index 188412d45e0d..6d94ff4a4f1a 100644
--- a/drivers/cxl/pci.c
+++ b/drivers/cxl/pci.c
@@ -475,9 +475,9 @@ static bool is_cxl_restricted(struct pci_dev *pdev)
 }
 
 static int cxl_rcrb_get_comp_regs(struct pci_dev *pdev,
-				  struct cxl_register_map *map)
+				  struct cxl_register_map *map,
+				  struct cxl_dport *dport)
 {
-	struct cxl_dport *dport;
 	resource_size_t component_reg_phys;
 
 	*map = (struct cxl_register_map) {
@@ -513,11 +513,24 @@ static int cxl_pci_setup_regs(struct pci_dev *pdev, enum cxl_regloc_type type,
 	 * is an RCH and try to extract the Component Registers from
 	 * an RCRB.
 	 */
-	if (rc && type == CXL_REGLOC_RBI_COMPONENT && is_cxl_restricted(pdev))
-		rc = cxl_rcrb_get_comp_regs(pdev, map);
-
-	if (rc)
+	if (rc && type == CXL_REGLOC_RBI_COMPONENT && is_cxl_restricted(pdev)) {
+		struct cxl_dport *dport;
+		struct cxl_port *port __free(put_cxl_port) =
+			cxl_pci_find_port(pdev, &dport);
+		if (!port)
+			return -EPROBE_DEFER;
+
+		rc = cxl_rcrb_get_comp_regs(pdev, map, dport);
+		if (rc)
+			return rc;
+
+		rc = cxl_dport_map_rcd_linkcap(pdev, dport);
+		if (rc)
+			return rc;
+
+	} else if (rc) {
 		return rc;
+	}
 
 	return cxl_setup_regs(map);
 }
@@ -764,10 +777,6 @@ static int cxl_event_config(struct pci_host_bridge *host_bridge,
 		return 0;
 	}
 
-	rc = cxl_mem_alloc_event_buf(mds);
-	if (rc)
-		return rc;
-
 	rc = cxl_event_get_int_policy(mds, &policy);
 	if (rc)
 		return rc;
@@ -781,6 +790,10 @@ static int cxl_event_config(struct pci_host_bridge *host_bridge,
 		return -EBUSY;
 	}
 
+	rc = cxl_mem_alloc_event_buf(mds);
+	if (rc)
+		return rc;
+
 	rc = cxl_event_irqsetup(mds);
 	if (rc)
 		return rc;
@@ -807,6 +820,86 @@ static int cxl_pci_type3_init_mailbox(struct cxl_dev_state *cxlds)
 	return 0;
 }
 
+static ssize_t rcd_pcie_cap_emit(struct device *dev, u16 offset, char *buf, size_t width)
+{
+	struct cxl_dev_state *cxlds = dev_get_drvdata(dev);
+	struct cxl_memdev *cxlmd = cxlds->cxlmd;
+	struct device *root_dev;
+	struct cxl_dport *dport;
+	struct cxl_port *root __free(put_cxl_port) =
+		cxl_mem_find_port(cxlmd, &dport);
+
+	if (!root)
+		return -ENXIO;
+
+	root_dev = root->uport_dev;
+	if (!root_dev)
+		return -ENXIO;
+
+	if (!dport->regs.rcd_pcie_cap)
+		return -ENXIO;
+
+	guard(device)(root_dev);
+	if (!root_dev->driver)
+		return -ENXIO;
+
+	switch (width) {
+	case 2:
+		return sysfs_emit(buf, "%#x\n",
+				  readw(dport->regs.rcd_pcie_cap + offset));
+	case 4:
+		return sysfs_emit(buf, "%#x\n",
+				  readl(dport->regs.rcd_pcie_cap + offset));
+	default:
+		return -EINVAL;
+	}
+}
+
+static ssize_t rcd_link_cap_show(struct device *dev,
+				 struct device_attribute *attr, char *buf)
+{
+	return rcd_pcie_cap_emit(dev, PCI_EXP_LNKCAP, buf, sizeof(u32));
+}
+static DEVICE_ATTR_RO(rcd_link_cap);
+
+static ssize_t rcd_link_ctrl_show(struct device *dev,
+				  struct device_attribute *attr, char *buf)
+{
+	return rcd_pcie_cap_emit(dev, PCI_EXP_LNKCTL, buf, sizeof(u16));
+}
+static DEVICE_ATTR_RO(rcd_link_ctrl);
+
+static ssize_t rcd_link_status_show(struct device *dev,
+				    struct device_attribute *attr, char *buf)
+{
+	return rcd_pcie_cap_emit(dev, PCI_EXP_LNKSTA, buf, sizeof(u16));
+}
+static DEVICE_ATTR_RO(rcd_link_status);
+
+static struct attribute *cxl_rcd_attrs[] = {
+	&dev_attr_rcd_link_cap.attr,
+	&dev_attr_rcd_link_ctrl.attr,
+	&dev_attr_rcd_link_status.attr,
+	NULL
+};
+
+static umode_t cxl_rcd_visible(struct kobject *kobj, struct attribute *a, int n)
+{
+	struct device *dev = kobj_to_dev(kobj);
+	struct pci_dev *pdev = to_pci_dev(dev);
+
+	if (is_cxl_restricted(pdev))
+		return a->mode;
+
+	return 0;
+}
+
+static struct attribute_group cxl_rcd_group = {
+	.attrs = cxl_rcd_attrs,
+	.is_visible = cxl_rcd_visible,
+};
+__ATTRIBUTE_GROUPS(cxl_rcd);
+
 static int cxl_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 {
 	struct pci_host_bridge *host_bridge = pci_find_host_bridge(pdev->bus);
@@ -942,8 +1035,7 @@ static int cxl_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 	if (rc)
 		return rc;
 
-	rc = cxl_pci_ras_unmask(pdev);
-	if (rc)
+	if (cxl_pci_ras_unmask(pdev))
 		dev_dbg(&pdev->dev, "No RAS reporting unmasked\n");
 
 	pci_save_state(pdev);
@@ -1016,6 +1108,7 @@ static struct pci_driver cxl_pci_driver = {
 	.id_table		= cxl_mem_pci_tbl,
 	.probe			= cxl_pci_probe,
 	.err_handler		= &cxl_error_handlers,
+	.dev_groups		= cxl_rcd_groups,
 	.driver	= {
 		.probe_type	= PROBE_PREFER_ASYNCHRONOUS,
 	},
@@ -1093,4 +1186,4 @@ module_init(cxl_pci_driver_init);
 module_exit(cxl_pci_driver_exit);
 MODULE_DESCRIPTION("CXL: PCI manageability");
 MODULE_LICENSE("GPL v2");
-MODULE_IMPORT_NS(CXL);
+MODULE_IMPORT_NS("CXL");
diff --git a/drivers/cxl/pmem.c b/drivers/cxl/pmem.c
index d2d43a4fc053..f9c95996e937 100644
--- a/drivers/cxl/pmem.c
+++ b/drivers/cxl/pmem.c
@@ -459,7 +459,7 @@ MODULE_DESCRIPTION("CXL PMEM: Persistent Memory Support");
 MODULE_LICENSE("GPL v2");
 module_init(cxl_pmem_init);
 module_exit(cxl_pmem_exit);
-MODULE_IMPORT_NS(CXL);
+MODULE_IMPORT_NS("CXL");
 MODULE_ALIAS_CXL(CXL_DEVICE_NVDIMM_BRIDGE);
 MODULE_ALIAS_CXL(CXL_DEVICE_NVDIMM);
 MODULE_ALIAS_CXL(CXL_DEVICE_PMEM_REGION);
diff --git a/drivers/cxl/port.c b/drivers/cxl/port.c
index 9dc394295e1f..4c83f6a22e58 100644
--- a/drivers/cxl/port.c
+++ b/drivers/cxl/port.c
@@ -173,7 +173,7 @@ static ssize_t CDAT_read(struct file *filp, struct kobject *kobj,
 static BIN_ATTR_ADMIN_RO(CDAT, 0);
 
 static umode_t cxl_port_bin_attr_is_visible(struct kobject *kobj,
-					    struct bin_attribute *attr, int i)
+					    const struct bin_attribute *attr, int i)
 {
 	struct device *dev = kobj_to_dev(kobj);
 	struct cxl_port *port = to_cxl_port(dev);
@@ -226,5 +226,5 @@ module_exit(cxl_port_exit);
 
 MODULE_DESCRIPTION("CXL: Port enumeration and services");
 MODULE_LICENSE("GPL v2");
-MODULE_IMPORT_NS(CXL);
+MODULE_IMPORT_NS("CXL");
 MODULE_ALIAS_CXL(CXL_DEVICE_PORT);