scsi: cxlflash: Setup AFU PASID

Per the OCXL specification, the maximum PASID supported by the AFU is
indicated by a field within the configuration space. Similar to acTags,
implementations can choose to use any sub-range of PASID within their assigned
range. For cxlflash, the entire range is used.

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>

drivers/scsi/cxlflash/ocxl_hw.c

@@ -118,6 +118,9 @@ static int ocxlflash_config_afu(struct pci_dev *pdev, struct ocxl_hw_afu *afu)
 	dev_dbg(dev, "%s: acTag base=%d enabled=%d\n", __func__, base, count);
 	afu->afu_actag_base = base;
 	afu->afu_actag_enabled = count;
+	afu->max_pasid = 1 << acfg->pasid_supported_log;
+
+	ocxl_config_set_afu_pasid(pdev, pos, 0, acfg->pasid_supported_log);
 out:
 	return rc;
 }

drivers/scsi/cxlflash/ocxl_hw.h

@@ -25,5 +25,6 @@ struct ocxl_hw_afu {
 	int afu_actag_base;		/* AFU acTag base */
 	int afu_actag_enabled;		/* AFU acTag number enabled */
 
+	int max_pasid;			/* Maximum number of contexts */
 	bool is_present;		/* Function has AFUs defined */
 };