+/* PCIe Designated Vendor-Specific Capability */
+#define PCI_DVSEC_HEADER1 4 /* Designated Vendor-Specific Header 1 */
+#define PCI_DVSEC_HEADER2 8 /* Designated Vendor-Specific Header 2 */
+#define PCI_DVSEC_VENDOR_ID_CXL 0x1e98 /* Designated Vendor-Specific Vendor ID for CXL */
+#define PCI_DVSEC_ID_CXL 0 /* Designated Vendor-Specific ID for Intel CXL */
+
+/* PCIe CXL Designated Vendor-Specific Capabilities for Devices: Control, Status */
+#define PCI_CXL_DEV_LEN 0x38 /* CXL Device DVSEC Length */
+#define PCI_CXL_DEV_CAP 0x0a /* CXL Capability Register */
+#define PCI_CXL_DEV_CAP_CACHE 0x0001 /* CXL.cache Protocol Support */
+#define PCI_CXL_DEV_CAP_IO 0x0002 /* CXL.io Protocol Support */
+#define PCI_CXL_DEV_CAP_MEM 0x0004 /* CXL.mem Protocol Support */
+#define PCI_CXL_DEV_CAP_MEM_HWINIT 0x0008 /* CXL.mem Initializes with HW/FW Support */
+#define PCI_CXL_DEV_CAP_HDM_CNT(x) (((x) & (3 << 4)) >> 4) /* CXL Number of HDM ranges */
+#define PCI_CXL_DEV_CAP_VIRAL 0x4000 /* CXL Viral Handling Support */
+#define PCI_CXL_DEV_CTRL 0x0c /* CXL Control Register */
+#define PCI_CXL_DEV_CTRL_CACHE 0x0001 /* CXL.cache Protocol Enable */
+#define PCI_CXL_DEV_CTRL_IO 0x0002 /* CXL.io Protocol Enable */
+#define PCI_CXL_DEV_CTRL_MEM 0x0004 /* CXL.mem Protocol Enable */
+#define PCI_CXL_DEV_CTRL_CACHE_SF_COV(x) (((x) & (0x1f << 3)) >> 3) /* Snoop Filter Coverage */
+#define PCI_CXL_DEV_CTRL_CACHE_SF_GRAN(x) (((x) & (0x7 << 8)) >> 8) /* Snoop Filter Granularity */
+#define PCI_CXL_DEV_CTRL_CACHE_CLN 0x0800 /* CXL.cache Performance Hint on Clean Evictions */
+#define PCI_CXL_DEV_CTRL_VIRAL 0x4000 /* CXL Viral Handling Enable */
+#define PCI_CXL_DEV_STATUS 0x0e /* CXL Status Register */
+#define PCI_CXL_DEV_STATUS_VIRAL 0x4000 /* CXL Viral Handling Status */
+#define PCI_CXL_DEV_STATUS2 0x12
+#define PCI_CXL_DEV_STATUS_CACHE_INV 0x0001
+#define PCI_CXL_DEV_STATUS_RC 0x0002 /* Device Reset Complete */
+#define PCI_CXL_DEV_STATUS_RE 0x0004 /* Device Reset Error */
+#define PCI_CXL_DEV_STATUS_PMC 0x8000 /* Power Management Init Complete */
+#define PCI_CXL_DEV_CAP2 0x16
+#define PCI_CXL_DEV_CAP2_CACHE_UNK 0x0000 /* Cache Size Isn't Reported */
+#define PCI_CXL_DEV_CAP2_CACHE_64K 0x0001 /* Unit Size 64K */
+#define PCI_CXL_DEV_CAP2_CACHE_1M 0x0002 /* Unit Size 1M */
+#define PCI_CXL_DEV_RANGE1_SIZE_HI 0x18
+#define PCI_CXL_DEV_RANGE1_SIZE_LO 0x1c
+#define PCI_CXL_RANGE_VALID 0x0001
+#define PCI_CXL_RANGE_ACTIVE 0x0002
+#define PCI_CXL_RANGE_TYPE(x) (((x) >> 2) & 0x7)
+#define PCI_CXL_RANGE_CLASS(x) (((x) >> 5) & 0x7)
+#define PCI_CXL_RANGE_INTERLEAVE(x) (((x) >> 8) & 0x1f)
+#define PCI_CXL_RANGE_TIMEOUT(x) (((x) >> 13) & 0x7)
+#define PCI_CXL_DEV_RANGE1_BASE_HI 0x20
+#define PCI_CXL_DEV_RANGE1_BASE_LO 0x24
+#define PCI_CXL_DEV_RANGE2_SIZE_HI 0x28
+#define PCI_CXL_DEV_RANGE2_SIZE_LO 0x2c
+#define PCI_CXL_DEV_RANGE2_BASE_HI 0x30
+#define PCI_CXL_DEV_RANGE2_BASE_LO 0x34
+
+/* PCIe CXL 2.0 Designated Vendor-Specific Capabilities for Ports */
+#define PCI_CXL_PORT_EXT_LEN 0x28 /* CXL Extensions DVSEC for Ports Length */
+#define PCI_CXL_PORT_EXT_STATUS 0x0a /* Port Extension Status */
+#define PCI_CXL_PORT_PM_INIT_COMPLETE 0x1 /* Port Power Management Initialization Complete */
+#define PCI_CXL_PORT_CTRL 0x0c /* Port Control Override */
+#define PCI_CXL_PORT_UNMASK_SBR 0x0001 /* Unmask SBR */
+#define PCI_CXL_PORT_UNMASK_LINK 0x0002 /* Unmask Link Disable */
+#define PCI_CXL_PORT_ALT_MEMORY 0x0004 /* Alt Memory and ID Space Enable */
+#define PCI_CXL_PORT_ALT_BME 0x0008 /* Alt BME */
+#define PCI_CXL_PORT_VIRAL_EN 0x4000 /* Viral Enable */
+#define PCI_CXL_PORT_ALT_BUS_BASE 0xe
+#define PCI_CXL_PORT_ALT_BUS_LIMIT 0xf
+#define PCI_CXL_PORT_ALT_MEM_BASE 0x10
+#define PCI_CXL_PORT_ALT_MEM_LIMIT 0x12
+
+/* PCIe CXL 2.0 Designated Vendor-Specific Capabilities for Register Locator */
+#define PCI_CXL_RL_BASE0_LO 0x0c
+#define PCI_CXL_RL_BASE0_HI 0x10
+#define PCI_CXL_RL_BASE1_LO 0x14
+#define PCI_CXL_RL_BASE1_HI 0x18
+#define PCI_CXL_RL_BASE2_LO 0x1c
+#define PCI_CXL_RL_BASE2_HI 0x20
+