cxl/region: Enable CONFIG_CXL_REGION to be toggled

Add help text and a label so the CXL_REGION config option can be
toggled. This is mainly to enable compile testing without region
support.

Reviewed-by: Vishal Verma <vishal.l.verma@intel.com>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Reviewed-by: Gregory Price <gregory.price@memverge.com>
Tested-by: Fan Ni <fan.ni@samsung.com>
Link: https://lore.kernel.org/r/167601998765.1924368.258370414771847699.stgit@dwillia2-xfh.jf.intel.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

diff --git a/drivers/cxl/Kconfig b/drivers/cxl/Kconfig
index 0ac53c4..163c094 100644 (file)
--- a/drivers/cxl/Kconfig
+++ b/drivers/cxl/Kconfig
@@ -104,12 +104,22 @@ config CXL_SUSPEND
        depends on SUSPEND && CXL_MEM
 
 config CXL_REGION
-       bool
+       bool "CXL: Region Support"
        default CXL_BUS
        # For MAX_PHYSMEM_BITS
        depends on SPARSEMEM
        select MEMREGION
        select GET_FREE_REGION
+       help
+         Enable the CXL core to enumerate and provision CXL regions. A CXL
+         region is defined by one or more CXL expanders that decode a given
+         system-physical address range. For CXL regions established by
+         platform-firmware this option enables memory error handling to
+         identify the devices participating in a given interleaved memory
+         range. Otherwise, platform-firmware managed CXL is enabled by being
+         placed in the system address map and does not need a driver.
+
+         If unsure say 'y'
 
 config CXL_REGION_INVALIDATION_TEST
        bool "CXL: Region Cache Management Bypass (TEST)"