[PATCH v13 06/15] cxl: Make HDM reset helpers available to built-in PCI code

[Srirangan Madhavan]

PCI can be built in while CXL_BUS is modular, so PCI reset code cannot
depend on helpers provided by the cxl_core module.

Build the HDM resource helpers under CONFIG_CXL_RESET and restrict their
exports to cxl_core.

Signed-off-by: Srirangan Madhavan <smadhavan@xxxxxxxxxx>
---
 drivers/cxl/Kconfig         | 4 ++++
 drivers/cxl/core/Makefile   | 2 +-
 drivers/cxl/core/resource.c | 4 ++++
 tools/testing/cxl/Kbuild    | 1 -
 4 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/drivers/cxl/Kconfig b/drivers/cxl/Kconfig
index 80aeb0d556bd..0cd704670735 100644
--- a/drivers/cxl/Kconfig
+++ b/drivers/cxl/Kconfig
@@ -6,6 +6,7 @@ menuconfig CXL_BUS
 	select FW_UPLOAD
 	select PCI_DOE
 	select FIRMWARE_TABLE
+	select CXL_RESET
 	select NUMA_KEEP_MEMINFO if NUMA_MEMBLKS
 	select FWCTL if CXL_FEATURES
 	help
@@ -244,3 +245,6 @@ config CXL_ATL
 	depends on ACPI_PRMT && AMD_NB
 
 endif
+
+config CXL_RESET
+	bool
diff --git a/drivers/cxl/core/Makefile b/drivers/cxl/core/Makefile
index 57995777af0d..30470799e059 100644
--- a/drivers/cxl/core/Makefile
+++ b/drivers/cxl/core/Makefile
@@ -1,12 +1,12 @@
 # SPDX-License-Identifier: GPL-2.0
 obj-$(CONFIG_CXL_BUS) += cxl_core.o
+obj-$(CONFIG_CXL_RESET) += resource.o
 obj-$(CONFIG_CXL_SUSPEND) += suspend.o
 
 ccflags-y += -I$(srctree)/drivers/cxl
 CFLAGS_trace.o = -DTRACE_INCLUDE_PATH=. -I$(src)
 
 cxl_core-y := port.o
-cxl_core-y += resource.o
 cxl_core-y += pmem.o
 cxl_core-y += regs.o
 cxl_core-y += memdev.o
diff --git a/drivers/cxl/core/resource.c b/drivers/cxl/core/resource.c
index ea0d855e5549..1b4742622054 100644
--- a/drivers/cxl/core/resource.c
+++ b/drivers/cxl/core/resource.c
@@ -3,6 +3,7 @@
 #include <linux/delay.h>
 #include <linux/bug.h>
 #include <linux/errno.h>
+#include <linux/export.h>
 #include <linux/kernel.h>
 
 #include "cxl.h"
@@ -12,6 +13,7 @@ struct cxl_rwsem cxl_rwsem = {
 	.region = __RWSEM_INITIALIZER(cxl_rwsem.region),
 	.dpa = __RWSEM_INITIALIZER(cxl_rwsem.dpa),
 };
+EXPORT_SYMBOL_FOR_MODULES(cxl_rwsem, "cxl_core");
 
 static void cxld_set_interleave(struct cxl_decoder_config *config, u32 *ctrl)
 {
@@ -100,8 +102,10 @@ void cxl_commit_start(void __iomem *hdm, struct cxl_decoder_settings *settings)
 	lockdep_assert_held(&cxl_rwsem.dpa);
 	setup_hw_decoder(hdm, settings);
 }
+EXPORT_SYMBOL_FOR_MODULES(cxl_commit_start, "cxl_core");
 
 int cxl_commit_wait(void __iomem *hdm, struct cxl_decoder_settings *settings)
 {
 	return cxld_await_commit(hdm, settings->config.id);
 }
+EXPORT_SYMBOL_FOR_MODULES(cxl_commit_wait, "cxl_core");
diff --git a/tools/testing/cxl/Kbuild b/tools/testing/cxl/Kbuild
index 6c09932587ce..2be1df80fcc9 100644
--- a/tools/testing/cxl/Kbuild
+++ b/tools/testing/cxl/Kbuild
@@ -60,7 +60,6 @@ cxl_core-y += $(CXL_CORE_SRC)/memdev.o
 cxl_core-y += $(CXL_CORE_SRC)/mbox.o
 cxl_core-y += $(CXL_CORE_SRC)/pci.o
 cxl_core-y += $(CXL_CORE_SRC)/hdm.o
-cxl_core-y += $(CXL_CORE_SRC)/resource.o
 cxl_core-y += $(CXL_CORE_SRC)/pmu.o
 cxl_core-y += $(CXL_CORE_SRC)/cdat.o
 cxl_core-$(CONFIG_TRACING) += $(CXL_CORE_SRC)/trace.o
-- 
2.43.0