cxl/pci: Store the endpoint's Component Register mappings in struct cxl_dev_state

Same as for ports and dports, also store the endpoint's Component
Register mappings, use struct cxl_dev_state for that.

Keep the Component Register base address @component_reg_phys a bit to
not break functionality. It will be removed after the transition in a
later patch.

Signed-off-by: Terry Bowman <terry.bowman@amd.com>
Signed-off-by: Robert Richter <rrichter@amd.com>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Link: https://lore.kernel.org/r/20231018171713.1883517-7-rrichter@amd.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

Author: Robert Richter

drivers/cxl/core/mbox.c

@@ -1377,6 +1377,8 @@ struct cxl_memdev_state *cxl_memdev_state_create(struct device *dev)
 	mutex_init(&mds->mbox_mutex);
 	mutex_init(&mds->event.log_lock);
 	mds->cxlds.dev = dev;
+	mds->cxlds.reg_map.host = dev;
+	mds->cxlds.reg_map.resource = CXL_RESOURCE_NONE;
 	mds->cxlds.type = CXL_DEVTYPE_CLASSMEM;
 
 	return mds;

drivers/cxl/cxlmem.h

@@ -397,6 +397,7 @@ enum cxl_devtype {
  *
  * @dev: The device associated with this CXL state
  * @cxlmd: The device representing the CXL.mem capabilities of @dev
+ * @reg_map: component and ras register mapping parameters
  * @regs: Parsed register blocks
  * @cxl_dvsec: Offset to the PCIe device DVSEC
  * @rcd: operating in RCD mode (CXL 3.0 9.11.8 CXL Devices Attached to an RCH)
@@ -411,6 +412,7 @@ enum cxl_devtype {
 struct cxl_dev_state {
 	struct device *dev;
 	struct cxl_memdev *cxlmd;
+	struct cxl_register_map reg_map;
 	struct cxl_regs regs;
 	int cxl_dvsec;
 	bool rcd;

drivers/cxl/pci.c

@@ -835,15 +835,16 @@ static int cxl_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 	 * still be useful for management functions so don't return an error.
 	 */
 	cxlds->component_reg_phys = CXL_RESOURCE_NONE;
-	rc = cxl_pci_setup_regs(pdev, CXL_REGLOC_RBI_COMPONENT, &map);
+	rc = cxl_pci_setup_regs(pdev, CXL_REGLOC_RBI_COMPONENT,
+				&cxlds->reg_map);
 	if (rc)
 		dev_warn(&pdev->dev, "No component registers (%d)\n", rc);
-	else if (!map.component_map.ras.valid)
+	else if (!cxlds->reg_map.component_map.ras.valid)
 		dev_dbg(&pdev->dev, "RAS registers not found\n");
 
-	cxlds->component_reg_phys = map.resource;
+	cxlds->component_reg_phys = cxlds->reg_map.resource;
 
-	rc = cxl_map_component_regs(&map, &cxlds->regs.component,
+	rc = cxl_map_component_regs(&cxlds->reg_map, &cxlds->regs.component,
 				    BIT(CXL_CM_CAP_CAP_ID_RAS));
 	if (rc)
 		dev_dbg(&pdev->dev, "Failed to map RAS capability.\n");