Merge branch 'for-6.18/cxl-delay-dport' into cxl-for-next

Add changes to delay the allocation and setup of dports until when the
endpoint device is being probed. At this point, the CXL link is
established from endpoint to host bridge. Addresses issues seen on
some platforms when dports are probed earlier.

Link: https://lore.kernel.org/linux-cxl/20250829180928.842707-1-dave.jiang@intel.com/

6 files changed, 172 insertions, 90 deletions

diff --git a/tools/testing/cxl/Kbuild b/tools/testing/cxl/Kbuild
index d07f14cb7aa4..0d5ce4b74b9f 100644
--- a/tools/testing/cxl/Kbuild
+++ b/tools/testing/cxl/Kbuild
@@ -5,22 +5,19 @@ ldflags-y += --wrap=acpi_evaluate_integer
 ldflags-y += --wrap=acpi_pci_find_root
 ldflags-y += --wrap=nvdimm_bus_register
 ldflags-y += --wrap=devm_cxl_port_enumerate_dports
-ldflags-y += --wrap=devm_cxl_setup_hdm
-ldflags-y += --wrap=devm_cxl_add_passthrough_decoder
-ldflags-y += --wrap=devm_cxl_enumerate_decoders
 ldflags-y += --wrap=cxl_await_media_ready
-ldflags-y += --wrap=cxl_hdm_decode_init
-ldflags-y += --wrap=cxl_dvsec_rr_decode
 ldflags-y += --wrap=devm_cxl_add_rch_dport
 ldflags-y += --wrap=cxl_rcd_component_reg_phys
 ldflags-y += --wrap=cxl_endpoint_parse_cdat
 ldflags-y += --wrap=cxl_dport_init_ras_reporting
+ldflags-y += --wrap=devm_cxl_endpoint_decoders_setup
 
 DRIVERS := ../../../drivers
 CXL_SRC := $(DRIVERS)/cxl
 CXL_CORE_SRC := $(DRIVERS)/cxl/core
 ccflags-y := -I$(srctree)/drivers/cxl/
 ccflags-y += -D__mock=__weak
+ccflags-y += -DCXL_TEST_ENABLE=1
 ccflags-y += -DTRACE_INCLUDE_PATH=$(CXL_CORE_SRC) -I$(srctree)/drivers/cxl/core/
 
 obj-m += cxl_acpi.o
diff --git a/tools/testing/cxl/cxl_core_exports.c b/tools/testing/cxl/cxl_core_exports.c
index f088792a8925..6754de35598d 100644
--- a/tools/testing/cxl/cxl_core_exports.c
+++ b/tools/testing/cxl/cxl_core_exports.c
@@ -2,6 +2,28 @@
 /* Copyright(c) 2022 Intel Corporation. All rights reserved. */
 
 #include "cxl.h"
+#include "exports.h"
 
 /* Exporting of cxl_core symbols that are only used by cxl_test */
 EXPORT_SYMBOL_NS_GPL(cxl_num_decoders_committed, "CXL");
+
+cxl_add_dport_by_dev_fn _devm_cxl_add_dport_by_dev =
+	__devm_cxl_add_dport_by_dev;
+EXPORT_SYMBOL_NS_GPL(_devm_cxl_add_dport_by_dev, "CXL");
+
+struct cxl_dport *devm_cxl_add_dport_by_dev(struct cxl_port *port,
+					    struct device *dport_dev)
+{
+	return _devm_cxl_add_dport_by_dev(port, dport_dev);
+}
+EXPORT_SYMBOL_NS_GPL(devm_cxl_add_dport_by_dev, "CXL");
+
+cxl_switch_decoders_setup_fn _devm_cxl_switch_port_decoders_setup =
+	__devm_cxl_switch_port_decoders_setup;
+EXPORT_SYMBOL_NS_GPL(_devm_cxl_switch_port_decoders_setup, "CXL");
+
+int devm_cxl_switch_port_decoders_setup(struct cxl_port *port)
+{
+	return _devm_cxl_switch_port_decoders_setup(port);
+}
+EXPORT_SYMBOL_NS_GPL(devm_cxl_switch_port_decoders_setup, "CXL");
diff --git a/tools/testing/cxl/exports.h b/tools/testing/cxl/exports.h
new file mode 100644
index 000000000000..7ebee7c0bd67
--- /dev/null
+++ b/tools/testing/cxl/exports.h
@@ -0,0 +1,13 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/* Copyright(c) 2025 Intel Corporation */
+#ifndef __MOCK_CXL_EXPORTS_H_
+#define __MOCK_CXL_EXPORTS_H_
+
+typedef struct cxl_dport *(*cxl_add_dport_by_dev_fn)(struct cxl_port *port,
+							  struct device *dport_dev);
+extern cxl_add_dport_by_dev_fn _devm_cxl_add_dport_by_dev;
+
+typedef int(*cxl_switch_decoders_setup_fn)(struct cxl_port *port);
+extern cxl_switch_decoders_setup_fn _devm_cxl_switch_port_decoders_setup;
+
+#endif
diff --git a/tools/testing/cxl/test/cxl.c b/tools/testing/cxl/test/cxl.c
index ba50338f8ada..2d135ca533d0 100644
--- a/tools/testing/cxl/test/cxl.c
+++ b/tools/testing/cxl/test/cxl.c
@@ -643,15 +643,8 @@ static struct cxl_hdm *mock_cxl_setup_hdm(struct cxl_port *port,
 	return cxlhdm;
 }
 
-static int mock_cxl_add_passthrough_decoder(struct cxl_port *port)
-{
-	dev_err(&port->dev, "unexpected passthrough decoder for cxl_test\n");
-	return -EOPNOTSUPP;
-}
-
-
 struct target_map_ctx {
-	int *target_map;
+	u32 *target_map;
 	int index;
 	int target_count;
 };
@@ -818,15 +811,21 @@ static void mock_init_hdm_decoder(struct cxl_decoder *cxld)
 		 */
 		if (WARN_ON(!dev))
 			continue;
+
 		cxlsd = to_cxl_switch_decoder(dev);
 		if (i == 0) {
 			/* put cxl_mem.4 second in the decode order */
-			if (pdev->id == 4)
+			if (pdev->id == 4) {
 				cxlsd->target[1] = dport;
-			else
+				cxld->target_map[1] = dport->port_id;
+			} else {
 				cxlsd->target[0] = dport;
-		} else
+				cxld->target_map[0] = dport->port_id;
+			}
+		} else {
 			cxlsd->target[0] = dport;
+			cxld->target_map[0] = dport->port_id;
+		}
 		cxld = &cxlsd->cxld;
 		cxld->target_type = CXL_DECODER_HOSTONLYMEM;
 		cxld->flags = CXL_DECODER_F_ENABLE;
@@ -863,9 +862,7 @@ static int mock_cxl_enumerate_decoders(struct cxl_hdm *cxlhdm,
 		target_count = NR_CXL_SWITCH_PORTS;
 
 	for (i = 0; i < NR_CXL_PORT_DECODERS; i++) {
-		int target_map[CXL_DECODER_MAX_INTERLEAVE] = { 0 };
 		struct target_map_ctx ctx = {
-			.target_map = target_map,
 			.target_count = target_count,
 		};
 		struct cxl_decoder *cxld;
@@ -894,6 +891,8 @@ static int mock_cxl_enumerate_decoders(struct cxl_hdm *cxlhdm,
 			cxld = &cxled->cxld;
 		}
 
+		ctx.target_map = cxld->target_map;
+
 		mock_init_hdm_decoder(cxld);
 
 		if (target_count) {
@@ -905,7 +904,7 @@ static int mock_cxl_enumerate_decoders(struct cxl_hdm *cxlhdm,
 			}
 		}
 
-		rc = cxl_decoder_add_locked(cxld, target_map);
+		rc = cxl_decoder_add_locked(cxld);
 		if (rc) {
 			put_device(&cxld->dev);
 			dev_err(&port->dev, "Failed to add decoder\n");
@@ -921,10 +920,42 @@ static int mock_cxl_enumerate_decoders(struct cxl_hdm *cxlhdm,
 	return 0;
 }
 
-static int mock_cxl_port_enumerate_dports(struct cxl_port *port)
+static int __mock_cxl_decoders_setup(struct cxl_port *port)
+{
+	struct cxl_hdm *cxlhdm;
+
+	cxlhdm = mock_cxl_setup_hdm(port, NULL);
+	if (IS_ERR(cxlhdm)) {
+		if (PTR_ERR(cxlhdm) != -ENODEV)
+			dev_err(&port->dev, "Failed to map HDM decoder capability\n");
+		return PTR_ERR(cxlhdm);
+	}
+
+	return mock_cxl_enumerate_decoders(cxlhdm, NULL);
+}
+
+static int mock_cxl_switch_port_decoders_setup(struct cxl_port *port)
+{
+	if (is_cxl_root(port) || is_cxl_endpoint(port))
+		return -EOPNOTSUPP;
+
+	return __mock_cxl_decoders_setup(port);
+}
+
+static int mock_cxl_endpoint_decoders_setup(struct cxl_port *port)
+{
+	if (!is_cxl_endpoint(port))
+		return -EOPNOTSUPP;
+
+	return __mock_cxl_decoders_setup(port);
+}
+
+static int get_port_array(struct cxl_port *port,
+			  struct platform_device ***port_array,
+			  int *port_array_size)
 {
 	struct platform_device **array;
-	int i, array_size;
+	int array_size;
 
 	if (port->depth == 1) {
 		if (is_multi_bridge(port->uport_dev)) {
@@ -958,6 +989,22 @@ static int mock_cxl_port_enumerate_dports(struct cxl_port *port)
 		return -ENXIO;
 	}
 
+	*port_array = array;
+	*port_array_size = array_size;
+
+	return 0;
+}
+
+static int mock_cxl_port_enumerate_dports(struct cxl_port *port)
+{
+	struct platform_device **array;
+	int i, array_size;
+	int rc;
+
+	rc = get_port_array(port, &array, &array_size);
+	if (rc)
+		return rc;
+
 	for (i = 0; i < array_size; i++) {
 		struct platform_device *pdev = array[i];
 		struct cxl_dport *dport;
@@ -979,6 +1026,36 @@ static int mock_cxl_port_enumerate_dports(struct cxl_port *port)
 	return 0;
 }
 
+static struct cxl_dport *mock_cxl_add_dport_by_dev(struct cxl_port *port,
+						   struct device *dport_dev)
+{
+	struct platform_device **array;
+	int rc, i, array_size;
+
+	rc = get_port_array(port, &array, &array_size);
+	if (rc)
+		return ERR_PTR(rc);
+
+	for (i = 0; i < array_size; i++) {
+		struct platform_device *pdev = array[i];
+
+		if (pdev->dev.parent != port->uport_dev) {
+			dev_dbg(&port->dev, "%s: mismatch parent %s\n",
+				dev_name(port->uport_dev),
+				dev_name(pdev->dev.parent));
+			continue;
+		}
+
+		if (&pdev->dev != dport_dev)
+			continue;
+
+		return devm_cxl_add_dport(port, &pdev->dev, pdev->id,
+					  CXL_RESOURCE_NONE);
+	}
+
+	return ERR_PTR(-ENODEV);
+}
+
 /*
  * Faking the cxl_dpa_perf for the memdev when appropriate.
  */
@@ -1035,11 +1112,11 @@ static struct cxl_mock_ops cxl_mock_ops = {
 	.acpi_table_parse_cedt = mock_acpi_table_parse_cedt,
 	.acpi_evaluate_integer = mock_acpi_evaluate_integer,
 	.acpi_pci_find_root = mock_acpi_pci_find_root,
+	.devm_cxl_switch_port_decoders_setup = mock_cxl_switch_port_decoders_setup,
+	.devm_cxl_endpoint_decoders_setup = mock_cxl_endpoint_decoders_setup,
 	.devm_cxl_port_enumerate_dports = mock_cxl_port_enumerate_dports,
-	.devm_cxl_setup_hdm = mock_cxl_setup_hdm,
-	.devm_cxl_add_passthrough_decoder = mock_cxl_add_passthrough_decoder,
-	.devm_cxl_enumerate_decoders = mock_cxl_enumerate_decoders,
 	.cxl_endpoint_parse_cdat = mock_cxl_endpoint_parse_cdat,
+	.devm_cxl_add_dport_by_dev = mock_cxl_add_dport_by_dev,
 	.list = LIST_HEAD_INIT(cxl_mock_ops.list),
 };
 
diff --git a/tools/testing/cxl/test/mock.c b/tools/testing/cxl/test/mock.c
index 1989ae020df3..995269a75cbd 100644
--- a/tools/testing/cxl/test/mock.c
+++ b/tools/testing/cxl/test/mock.c
@@ -10,12 +10,21 @@
 #include <cxlmem.h>
 #include <cxlpci.h>
 #include "mock.h"
+#include "../exports.h"
 
 static LIST_HEAD(mock);
 
+static struct cxl_dport *
+redirect_devm_cxl_add_dport_by_dev(struct cxl_port *port,
+				   struct device *dport_dev);
+static int redirect_devm_cxl_switch_port_decoders_setup(struct cxl_port *port);
+
 void register_cxl_mock_ops(struct cxl_mock_ops *ops)
 {
 	list_add_rcu(&ops->list, &mock);
+	_devm_cxl_add_dport_by_dev = redirect_devm_cxl_add_dport_by_dev;
+	_devm_cxl_switch_port_decoders_setup =
+		redirect_devm_cxl_switch_port_decoders_setup;
 }
 EXPORT_SYMBOL_GPL(register_cxl_mock_ops);
 
@@ -23,6 +32,9 @@ DEFINE_STATIC_SRCU(cxl_mock_srcu);
 
 void unregister_cxl_mock_ops(struct cxl_mock_ops *ops)
 {
+	_devm_cxl_switch_port_decoders_setup =
+		__devm_cxl_switch_port_decoders_setup;
+	_devm_cxl_add_dport_by_dev = __devm_cxl_add_dport_by_dev;
 	list_del_rcu(&ops->list);
 	synchronize_srcu(&cxl_mock_srcu);
 }
@@ -131,55 +143,34 @@ __wrap_nvdimm_bus_register(struct device *dev,
 }
 EXPORT_SYMBOL_GPL(__wrap_nvdimm_bus_register);
 
-struct cxl_hdm *__wrap_devm_cxl_setup_hdm(struct cxl_port *port,
-					  struct cxl_endpoint_dvsec_info *info)
-
-{
-	int index;
-	struct cxl_hdm *cxlhdm;
-	struct cxl_mock_ops *ops = get_cxl_mock_ops(&index);
-
-	if (ops && ops->is_mock_port(port->uport_dev))
-		cxlhdm = ops->devm_cxl_setup_hdm(port, info);
-	else
-		cxlhdm = devm_cxl_setup_hdm(port, info);
-	put_cxl_mock_ops(index);
-
-	return cxlhdm;
-}
-EXPORT_SYMBOL_NS_GPL(__wrap_devm_cxl_setup_hdm, "CXL");
-
-int __wrap_devm_cxl_add_passthrough_decoder(struct cxl_port *port)
+int redirect_devm_cxl_switch_port_decoders_setup(struct cxl_port *port)
 {
 	int rc, index;
 	struct cxl_mock_ops *ops = get_cxl_mock_ops(&index);
 
 	if (ops && ops->is_mock_port(port->uport_dev))
-		rc = ops->devm_cxl_add_passthrough_decoder(port);
+		rc = ops->devm_cxl_switch_port_decoders_setup(port);
 	else
-		rc = devm_cxl_add_passthrough_decoder(port);
+		rc = __devm_cxl_switch_port_decoders_setup(port);
 	put_cxl_mock_ops(index);
 
 	return rc;
 }
-EXPORT_SYMBOL_NS_GPL(__wrap_devm_cxl_add_passthrough_decoder, "CXL");
 
-int __wrap_devm_cxl_enumerate_decoders(struct cxl_hdm *cxlhdm,
-				       struct cxl_endpoint_dvsec_info *info)
+int __wrap_devm_cxl_endpoint_decoders_setup(struct cxl_port *port)
 {
 	int rc, index;
-	struct cxl_port *port = cxlhdm->port;
 	struct cxl_mock_ops *ops = get_cxl_mock_ops(&index);
 
 	if (ops && ops->is_mock_port(port->uport_dev))
-		rc = ops->devm_cxl_enumerate_decoders(cxlhdm, info);
+		rc = ops->devm_cxl_endpoint_decoders_setup(port);
 	else
-		rc = devm_cxl_enumerate_decoders(cxlhdm, info);
+		rc = devm_cxl_endpoint_decoders_setup(port);
 	put_cxl_mock_ops(index);
 
 	return rc;
 }
-EXPORT_SYMBOL_NS_GPL(__wrap_devm_cxl_enumerate_decoders, "CXL");
+EXPORT_SYMBOL_NS_GPL(__wrap_devm_cxl_endpoint_decoders_setup, "CXL");
 
 int __wrap_devm_cxl_port_enumerate_dports(struct cxl_port *port)
 {
@@ -211,39 +202,6 @@ int __wrap_cxl_await_media_ready(struct cxl_dev_state *cxlds)
 }
 EXPORT_SYMBOL_NS_GPL(__wrap_cxl_await_media_ready, "CXL");
 
-int __wrap_cxl_hdm_decode_init(struct cxl_dev_state *cxlds,
-			       struct cxl_hdm *cxlhdm,
-			       struct cxl_endpoint_dvsec_info *info)
-{
-	int rc = 0, index;
-	struct cxl_mock_ops *ops = get_cxl_mock_ops(&index);
-
-	if (ops && ops->is_mock_dev(cxlds->dev))
-		rc = 0;
-	else
-		rc = cxl_hdm_decode_init(cxlds, cxlhdm, info);
-	put_cxl_mock_ops(index);
-
-	return rc;
-}
-EXPORT_SYMBOL_NS_GPL(__wrap_cxl_hdm_decode_init, "CXL");
-
-int __wrap_cxl_dvsec_rr_decode(struct cxl_dev_state *cxlds,
-			       struct cxl_endpoint_dvsec_info *info)
-{
-	int rc = 0, index;
-	struct cxl_mock_ops *ops = get_cxl_mock_ops(&index);
-
-	if (ops && ops->is_mock_dev(cxlds->dev))
-		rc = 0;
-	else
-		rc = cxl_dvsec_rr_decode(cxlds, info);
-	put_cxl_mock_ops(index);
-
-	return rc;
-}
-EXPORT_SYMBOL_NS_GPL(__wrap_cxl_dvsec_rr_decode, "CXL");
-
 struct cxl_dport *__wrap_devm_cxl_add_rch_dport(struct cxl_port *port,
 						struct device *dport_dev,
 						int port_id,
@@ -311,6 +269,22 @@ void __wrap_cxl_dport_init_ras_reporting(struct cxl_dport *dport, struct device
 }
 EXPORT_SYMBOL_NS_GPL(__wrap_cxl_dport_init_ras_reporting, "CXL");
 
+struct cxl_dport *redirect_devm_cxl_add_dport_by_dev(struct cxl_port *port,
+						     struct device *dport_dev)
+{
+	int index;
+	struct cxl_mock_ops *ops = get_cxl_mock_ops(&index);
+	struct cxl_dport *dport;
+
+	if (ops && ops->is_mock_port(port->uport_dev))
+		dport = ops->devm_cxl_add_dport_by_dev(port, dport_dev);
+	else
+		dport = __devm_cxl_add_dport_by_dev(port, dport_dev);
+	put_cxl_mock_ops(index);
+
+	return dport;
+}
+
 MODULE_LICENSE("GPL v2");
 MODULE_DESCRIPTION("cxl_test: emulation module");
 MODULE_IMPORT_NS("ACPI");
diff --git a/tools/testing/cxl/test/mock.h b/tools/testing/cxl/test/mock.h
index d1b0271d2822..4ed932e76aae 100644
--- a/tools/testing/cxl/test/mock.h
+++ b/tools/testing/cxl/test/mock.h
@@ -20,12 +20,11 @@ struct cxl_mock_ops {
 	bool (*is_mock_port)(struct device *dev);
 	bool (*is_mock_dev)(struct device *dev);
 	int (*devm_cxl_port_enumerate_dports)(struct cxl_port *port);
-	struct cxl_hdm *(*devm_cxl_setup_hdm)(
-		struct cxl_port *port, struct cxl_endpoint_dvsec_info *info);
-	int (*devm_cxl_add_passthrough_decoder)(struct cxl_port *port);
-	int (*devm_cxl_enumerate_decoders)(
-		struct cxl_hdm *hdm, struct cxl_endpoint_dvsec_info *info);
+	int (*devm_cxl_switch_port_decoders_setup)(struct cxl_port *port);
+	int (*devm_cxl_endpoint_decoders_setup)(struct cxl_port *port);
 	void (*cxl_endpoint_parse_cdat)(struct cxl_port *port);
+	struct cxl_dport *(*devm_cxl_add_dport_by_dev)(struct cxl_port *port,
+						       struct device *dport_dev);
 };
 
 void register_cxl_mock_ops(struct cxl_mock_ops *ops);