[PATCH v2 10/38] cxlflash: Setup AFU PASID

Uma Krishnan
2018-02-26T22:21:33Z

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>
---
drivers/scsi/cxlflash/ocxl_hw.c | 3 +++
drivers/scsi/cxlflash/ocxl_hw.h | 2 ++
2 files changed, 5 insertions(+)

diff --git a/drivers/scsi/cxlflash/ocxl_hw.c b/drivers/scsi/cxlflash/ocxl_hw.c
index d01847d9..bd86eef 100644
--- a/drivers/scsi/cxlflash/ocxl_hw.c
+++ b/drivers/scsi/cxlflash/ocxl_hw.c
@@ -111,6 +111,9 @@ 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;
}
diff --git a/drivers/scsi/cxlflash/ocxl_hw.h b/drivers/scsi/cxlflash/ocxl_hw.h
index 9c675fa..a6f7796 100644
--- a/drivers/scsi/cxlflash/ocxl_hw.h
+++ b/drivers/scsi/cxlflash/ocxl_hw.h
@@ -24,4 +24,6 @@ struct ocxl_hw_afu {
int fn_actag_enabled; /* Function acTag number enabled */
int afu_actag_base; /* AFU acTag base */
int afu_actag_enabled; /* AFU acTag number enabled */
+
+ int max_pasid; /* Maximum number of contexts */
};
--
2.1.0