scsi: cxlflash: Read host AFU configuration

The host AFU configuration is read on the initialization path to identify the
features and configuration of the AFU. This data is cached for use in later
configuration steps.

Signed-off-by: Uma Krishnan <ukrishn@linux.vnet.ibm.com>
Acked-by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com>
Reviewed-by: Andrew Donnellan <andrew.donnellan@au1.ibm.com>
Reviewed-by: Frederic Barrat <fbarrat@linux.vnet.ibm.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

1 files changed, 38 insertions, 0 deletions

diff --git a/drivers/scsi/cxlflash/ocxl_hw.c b/drivers/scsi/cxlflash/ocxl_hw.c
index 778384237b8c..11399cf12ebd 100644
--- a/drivers/scsi/cxlflash/ocxl_hw.c
+++ b/drivers/scsi/cxlflash/ocxl_hw.c
@@ -79,6 +79,37 @@ out:
 }
 
 /**
+ * ocxlflash_config_afu() - configure the host AFU
+ * @pdev:	PCI device associated with the host.
+ * @afu:	AFU associated with the host.
+ *
+ * Must be called _after_ host function configuration.
+ *
+ * Return: 0 on success, -errno on failure
+ */
+static int ocxlflash_config_afu(struct pci_dev *pdev, struct ocxl_hw_afu *afu)
+{
+	struct ocxl_afu_config *acfg = &afu->acfg;
+	struct ocxl_fn_config *fcfg = &afu->fcfg;
+	struct device *dev = &pdev->dev;
+	int rc = 0;
+
+	/* This HW AFU function does not have any AFUs defined */
+	if (!afu->is_present)
+		goto out;
+
+	/* Read AFU config at index 0 */
+	rc = ocxl_config_read_afu(pdev, fcfg, acfg, 0);
+	if (unlikely(rc)) {
+		dev_err(dev, "%s: ocxl_config_read_afu failed rc=%d\n",
+			__func__, rc);
+		goto out;
+	}
+out:
+	return rc;
+}
+
+/**
  * ocxlflash_create_afu() - create the AFU for OCXL
  * @pdev:	PCI device associated with the host.
  *
@@ -105,6 +136,13 @@ static void *ocxlflash_create_afu(struct pci_dev *pdev)
 			__func__, rc);
 		goto err1;
 	}
+
+	rc = ocxlflash_config_afu(pdev, afu);
+	if (unlikely(rc)) {
+		dev_err(dev, "%s: AFU configuration failed rc=%d\n",
+			__func__, rc);
+		goto err1;
+	}
 out:
 	return afu;
 err1: