netdev - [PATCH v2 13/15] cxl: preclude device memory to be used for dax

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Message-ID: <20240715172835.24757-14-alejandro.lucero-palau@amd.com>
Date: Mon, 15 Jul 2024 18:28:33 +0100
From: <alejandro.lucero-palau@....com>
To: <linux-cxl@...r.kernel.org>, <netdev@...r.kernel.org>,
	<dan.j.williams@...el.com>, <martin.habets@...inx.com>,
	<edward.cree@....com>, <davem@...emloft.net>, <kuba@...nel.org>,
	<pabeni@...hat.com>, <edumazet@...gle.com>, <richard.hughes@....com>
CC: Alejandro Lucero <alucero@...sl.com>, Alejandro Lucero <alucerop@....com>
Subject: [PATCH v2 13/15] cxl: preclude device memory to be used for dax

From: Alejandro Lucero <alucero@...sl.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@....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 697c8df83a4b..c8fc14ac437e 100644
--- a/drivers/cxl/core/region.c
+++ b/drivers/cxl/core/region.c
@@ -3704,6 +3704,9 @@ 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