[PATCH 02/16] cxl/regs: Add CXL Isolation capability mapping

[Ben Cheatham <Benjamin.Cheatham@xxxxxxx>]

Add necessary information to map the CXL Timeout & Isolation Capability
(CXL 3.2 8.2.4.24). This will be used in later commits by the CXL core
and PCIe portdrv driver to set up and manage the capability.

Signed-off-by: Ben Cheatham <Benjamin.Cheatham@xxxxxxx>
---
 drivers/cxl/core/regs.c | 8 ++++++++
 drivers/cxl/cxl.h       | 7 +++++++
 2 files changed, 15 insertions(+)

diff --git a/drivers/cxl/core/regs.c b/drivers/cxl/core/regs.c
index da8e668a3b70..bdc1eb59d69c 100644
--- a/drivers/cxl/core/regs.c
+++ b/drivers/cxl/core/regs.c
@@ -92,6 +92,13 @@ void cxl_probe_component_regs(struct device *dev, void __iomem *base,
 			length = CXL_RAS_CAPABILITY_LENGTH;
 			rmap = &map->ras;
 			break;
+		case CXL_CM_CAP_CAP_ID_ISOLATION:
+			dev_dbg(dev,
+				"found Timeout & Isolation capability (0x%x)\n",
+				offset);
+			length = CXL_ISOLATION_CAPABILITY_LENGTH;
+			rmap = &map->isolation;
+			break;
 		default:
 			dev_dbg(dev, "Unknown CM cap ID: %d (0x%x)\n", cap_id,
 				offset);
@@ -213,6 +220,7 @@ static int cxl_get_mapinfo(const struct cxl_register_map *map,
 	struct mapinfo mapinfo[] = {
 		{ &map->component_map.hdm_decoder, &regs->hdm_decoder },
 		{ &map->component_map.ras, &regs->ras },
+		{ &map->component_map.isolation, &regs->isolation },
 	};
 	int i;
 
diff --git a/drivers/cxl/cxl.h b/drivers/cxl/cxl.h
index a0fda305e25b..3013ba600ba3 100644
--- a/drivers/cxl/cxl.h
+++ b/drivers/cxl/cxl.h
@@ -41,6 +41,7 @@ extern const struct nvdimm_security_ops *cxl_security_ops;
 
 #define   CXL_CM_CAP_CAP_ID_RAS 0x2
 #define   CXL_CM_CAP_CAP_ID_HDM 0x5
+#define   CXL_CM_CAP_CAP_ID_ISOLATION 0x9
 #define   CXL_CM_CAP_CAP_HDM_VERSION 1
 
 /* HDM decoders CXL 2.0 8.2.5.12 CXL HDM Decoder Capability Structure */
@@ -133,6 +134,9 @@ static inline int ways_to_eiw(unsigned int ways, u8 *eiw)
 	return 0;
 }
 
+/* CXL 3.2 8.2.4.24 CXL Timeout and Isolation Capability Structure */
+#define CXL_ISOLATION_CAPABILITY_LENGTH 0x10
+
 /* RAS Registers CXL 2.0 8.2.5.9 CXL RAS Capability Structure */
 #define CXL_RAS_UNCORRECTABLE_STATUS_OFFSET 0x0
 #define   CXL_RAS_UNCORRECTABLE_STATUS_MASK (GENMASK(16, 14) | GENMASK(11, 0))
@@ -211,10 +215,12 @@ struct cxl_regs {
 	 * Common set of CXL Component register block base pointers
 	 * @hdm_decoder: CXL 2.0 8.2.5.12 CXL HDM Decoder Capability Structure
 	 * @ras: CXL 2.0 8.2.5.9 CXL RAS Capability Structure
+	 * @isolation: CXL 3.2 8.2.4.24 CXL Timeout & Isolation Capability Structure
 	 */
 	struct_group_tagged(cxl_component_regs, component,
 		void __iomem *hdm_decoder;
 		void __iomem *ras;
+		void __iomem *isolation;
 	);
 	/*
 	 * Common set of CXL Device register block base pointers
@@ -257,6 +263,7 @@ struct cxl_reg_map {
 struct cxl_component_reg_map {
 	struct cxl_reg_map hdm_decoder;
 	struct cxl_reg_map ras;
+	struct cxl_reg_map isolation;
 };
 
 struct cxl_device_reg_map {
-- 
2.34.1