scsi: cxlflash: Setup AFU acTag range

The OCXL specification supports distributing acTags amongst different AFUs and
functions on the link. As cxlflash devices are expected to only support a
single AFU per function, the entire range that was assigned to the function is
also assigned to the AFU.

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>

diff --git a/drivers/scsi/cxlflash/ocxl_hw.c b/drivers/scsi/cxlflash/ocxl_hw.c
index 11399cf12ebdf6a7b182bc8dad9dca76932c0fb5..105712b29b2ec85357f954fbb6b189b2fd17ddcb 100644 (file)
--- a/drivers/scsi/cxlflash/ocxl_hw.c
+++ b/drivers/scsi/cxlflash/ocxl_hw.c
@@ -92,6 +92,9 @@ 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 count;
+       int base;
+       int pos;
        int rc = 0;
 
        /* This HW AFU function does not have any AFUs defined */
@@ -105,6 +108,16 @@ static int ocxlflash_config_afu(struct pci_dev *pdev, struct ocxl_hw_afu *afu)
                        __func__, rc);
                goto out;
        }
+
+       /* Only one AFU per function is supported, so actag_base is same */
+       base = afu->fn_actag_base;
+       count = min_t(int, acfg->actag_supported, afu->fn_actag_enabled);
+       pos = acfg->dvsec_afu_control_pos;
+
+       ocxl_config_set_afu_actag(pdev, pos, base, count);
+       dev_dbg(dev, "%s: acTag base=%d enabled=%d\n", __func__, base, count);
+       afu->afu_actag_base = base;
+       afu->afu_actag_enabled = count;
 out:
        return rc;
 }

diff --git a/drivers/scsi/cxlflash/ocxl_hw.h b/drivers/scsi/cxlflash/ocxl_hw.h
index c9b284377cb778b323332179e5a5660ebf659be8..21803b52e3becd5df173ed5d70448134b7e19d3e 100644 (file)
--- a/drivers/scsi/cxlflash/ocxl_hw.h
+++ b/drivers/scsi/cxlflash/ocxl_hw.h
@@ -22,6 +22,8 @@ struct ocxl_hw_afu {
 
        int fn_actag_base;              /* Function acTag base */
        int fn_actag_enabled;           /* Function acTag number enabled */
+       int afu_actag_base;             /* AFU acTag base */
+       int afu_actag_enabled;          /* AFU acTag number enabled */
 
        bool is_present;                /* Function has AFUs defined */
 };