[PATCH 09/38] cxlflash: Setup AFU acTag range

[Uma Krishnan]

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

Signed-off-by: Uma Krishnan <ukrishn at linux.vnet.ibm.com>
---
 drivers/scsi/cxlflash/ocxl_hw.c | 13 +++++++++++++
 drivers/scsi/cxlflash/ocxl_hw.h |  2 ++
 2 files changed, 15 insertions(+)

diff --git a/drivers/scsi/cxlflash/ocxl_hw.c b/drivers/scsi/cxlflash/ocxl_hw.c
index 8e48480..3875ed4 100644
--- a/drivers/scsi/cxlflash/ocxl_hw.c
+++ b/drivers/scsi/cxlflash/ocxl_hw.c
@@ -89,6 +89,9 @@ 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;
 
 	/* Read AFU config at index 0 */
@@ -98,6 +101,16 @@ 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 29fd338..a0ef04c 100644
--- a/drivers/scsi/cxlflash/ocxl_hw.h
+++ b/drivers/scsi/cxlflash/ocxl_hw.h
@@ -22,4 +22,6 @@ 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 */
 };
-- 
2.1.0