[PATCH v2 07/38] cxlflash: Setup function acTag range

Uma Krishnan
2018-02-26T22:20:51Z

The OCXL specification supports distributing acTags amongst different
AFUs and functions on the link. The platform-specific acTag range for the
link is obtained using the OCXL provider services and then assigned to the
host function based on implementation. For cxlflash devices only a single
function per host is expected and thus the entire range is assigned.

Signed-off-by: Uma Krishnan <ukrishn@linux.vnet.ibm.com>
Acked-by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com>
---
drivers/scsi/cxlflash/ocxl_hw.c | 15 +++++++++++++++
drivers/scsi/cxlflash/ocxl_hw.h | 3 +++
2 files changed, 18 insertions(+)

diff --git a/drivers/scsi/cxlflash/ocxl_hw.c b/drivers/scsi/cxlflash/ocxl_hw.c
index dc32a73..39cccb7 100644
--- a/drivers/scsi/cxlflash/ocxl_hw.c
+++ b/drivers/scsi/cxlflash/ocxl_hw.c
@@ -42,6 +42,7 @@ static int ocxlflash_config_fn(struct pci_dev *pdev, struct ocxl_hw_afu *afu)
{
struct ocxl_fn_config *fcfg = &afu->fcfg;
struct device *dev = &pdev->dev;
+ u16 base, enabled, supported;
int rc = 0;

/* Read DVSEC config of the function */
@@ -56,6 +57,20 @@ static int ocxlflash_config_fn(struct pci_dev *pdev, struct ocxl_hw_afu *afu)
if (fcfg->max_afu_index != 0)
dev_warn(dev, "%s: Unexpected AFU index value %d\n",
__func__, fcfg->max_afu_index);
+
+ rc = ocxl_config_get_actag_info(pdev, &base, &enabled, &supported);
+ if (unlikely(rc)) {
+ dev_err(dev, "%s: ocxl_config_get_actag_info failed rc=%d\n",
+ __func__, rc);
+ goto out;
+ }
+
+ afu->fn_actag_base = base;
+ afu->fn_actag_enabled = enabled;
+
+ 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);
out:
return rc;
}
diff --git a/drivers/scsi/cxlflash/ocxl_hw.h b/drivers/scsi/cxlflash/ocxl_hw.h
index 658f420..190d71a 100644
--- a/drivers/scsi/cxlflash/ocxl_hw.h
+++ b/drivers/scsi/cxlflash/ocxl_hw.h
@@ -18,4 +18,7 @@ struct ocxl_hw_afu {
struct device *dev; /* Generic device */

struct ocxl_fn_config fcfg; /* DVSEC config of the function */
+
+ int fn_actag_base; /* Function acTag base */
+ int fn_actag_enabled; /* Function acTag number enabled */
};
--
2.1.0