scsi: cxlflash: Setup function OCXL link

After reading and modifying the function configuration, setup the OCXL link
using the OCXL provider services. The link is released when the adapter is
unconfigured.
Signed-off-by: Uma Krishnan <ukrishn@linux.vnet.ibm.com>
Acked-by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com>
Reviewed-by: Frederic Barrat <fbarrat@linux.vnet.ibm.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/cxlflash/ocxl_hw.c

@@ -415,10 +415,27 @@ static int ocxlflash_config_fn(struct pci_dev *pdev, struct ocxl_hw_afu *afu)
 	ocxl_config_set_actag(pdev, fcfg->dvsec_function_pos, base, enabled);
 	dev_dbg(dev, "%s: Function acTag range base=%u enabled=%u\n",
 		__func__, base, enabled);
+
+	rc = ocxl_link_setup(pdev, 0, &afu->link_token);
+	if (unlikely(rc)) {
+		dev_err(dev, "%s: ocxl_link_setup failed rc=%d\n",
+			__func__, rc);
+		goto out;
+	}
 out:
 	return rc;
 }
 
+/**
+ * ocxlflash_unconfig_fn() - unconfigure the host function
+ * @pdev:	PCI device associated with the host.
+ * @afu:	AFU associated with the host.
+ */
+static void ocxlflash_unconfig_fn(struct pci_dev *pdev, struct ocxl_hw_afu *afu)
+{
+	ocxl_link_release(pdev, afu->link_token);
+}
+
 /**
  * ocxlflash_map_mmio() - map the AFU MMIO space
  * @afu: AFU associated with the host.
@@ -560,7 +577,7 @@ static void *ocxlflash_create_afu(struct pci_dev *pdev)
 	if (unlikely(rc)) {
 		dev_err(dev, "%s: AFU configuration failed rc=%d\n",
 			__func__, rc);
-		goto err1;
+		goto err2;
 	}
 
 	ctx = ocxlflash_dev_context_init(pdev, afu);
@@ -568,14 +585,16 @@ static void *ocxlflash_create_afu(struct pci_dev *pdev)
 		rc = PTR_ERR(ctx);
 		dev_err(dev, "%s: ocxlflash_dev_context_init failed rc=%d\n",
 			__func__, rc);
-		goto err2;
+		goto err3;
 	}
 
 	afu->ocxl_ctx = ctx;
 out:
 	return afu;
-err2:
+err3:
 	ocxlflash_unconfig_afu(afu);
+err2:
+	ocxlflash_unconfig_fn(pdev, afu);
 err1:
 	idr_destroy(&afu->idr);
 	kfree(afu);

drivers/scsi/cxlflash/ocxl_hw.h

@@ -31,6 +31,7 @@ struct ocxl_hw_afu {
 	phys_addr_t gmmio_phys;		/* Global AFU MMIO space */
 	void __iomem *gmmio_virt;	/* Global MMIO map */
 
+	void *link_token;		/* Link token for the SPA */
 	struct idr idr;			/* IDR to manage contexts */
 	int max_pasid;			/* Maximum number of contexts */
 	bool is_present;		/* Function has AFUs defined */