[PATCH v3 18/20] cxl: preclude device memory to be used for dax

alejandro.lucero-palau
2024-09-07T08:19:59Z

From: Alejandro Lucero <alucerop@amd.com>

By definition a type2 cxl device will use the host managed memory for
specific functionality, therefore it should not be available to other
uses.

Signed-off-by: Alejandro Lucero <alucerop@amd.com>
---
drivers/cxl/core/region.c | 3 +++
1 file changed, 3 insertions(+)

diff --git a/drivers/cxl/core/region.c b/drivers/cxl/core/region.c
index d8c29e28e60c..45b4891035a6 100644
--- a/drivers/cxl/core/region.c
+++ b/drivers/cxl/core/region.c
@@ -3699,6 +3699,9 @@ static int cxl_region_probe(struct device *dev)
case CXL_DECODER_PMEM:
return devm_cxl_add_pmem_region(cxlr);
case CXL_DECODER_RAM:
+ if (cxlr->type != CXL_DECODER_HOSTONLYMEM)
+ return 0;
+
/*
* The region can not be manged by CXL if any portion of
* it is already online as 'System RAM'
--
2.17.1