[PATCH v6 2/2] event/dlb2: fix disable PASID

[PATCH v6 2/2] event/dlb2: fix disable PASID

[Abdullah Sevincer]

In vfio-pci driver when PASID is enabled by default DLB hardware puts
DLB in SIOV mode. This breaks DLB PF-PMD mode. For DLB PF-PMD mode to
function properly PASID needs to be disabled.

In this commit this issue is addressed and PASID is disabled by writing
a zero to PASID control register.

Fixes: 5433956d5185 ("event/dlb2: add eventdev probe")
Cc: stable@dpdk.org

Signed-off-by: Abdullah Sevincer <abdullah.sevincer@intel.com>
---
 drivers/event/dlb2/pf/dlb2_main.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/drivers/event/dlb2/pf/dlb2_main.c b/drivers/event/dlb2/pf/dlb2_main.c
index aa03e4c311..05c2354515 100644
--- a/drivers/event/dlb2/pf/dlb2_main.c
+++ b/drivers/event/dlb2/pf/dlb2_main.c
@@ -26,6 +26,7 @@
 #define PF_ID_ZERO 0	/* PF ONLY! */
 #define NO_OWNER_VF 0	/* PF ONLY! */
 #define NOT_VF_REQ false /* PF ONLY! */
+#define DLB2_PCI_PASID_CAP_OFFSET        0x148   /* PASID capability offset */
 
 static int
 dlb2_pf_init_driver_state(struct dlb2_dev *dlb2_dev)
@@ -514,6 +515,16 @@ dlb2_pf_reset(struct dlb2_dev *dlb2_dev)
 		}
 	}
 
+	/* Disable PASID if it is enabled by default, which
+	 * breaks the DLB if enabled.
+	 */
+	off = DLB2_PCI_PASID_CAP_OFFSET + RTE_PCI_PASID_CTRL;
+	if (rte_pci_pasid_ena_dis(pdev, off, false)) {
+		DLB2_LOG_ERR("[%s()] failed to write the pcie config space at offset %d\n",
+				__func__, (int)off);
+		return -1;
+	}
+
 	return 0;
 }
 
-- 
2.25.1