[dpdk-dev] [PATCH 1/2] common/cnxk: clear rvum interrupts

[Harman Kalra]

As per an known HW issue RVUM interrupts may get dropped, If an RVUM
interrupt event occurs when PCCPF_XXX_MSIX_CAP_HDR[MSIXEN]=0 then no
interrupt is triggered, which is expected. But after MSIXEN is set to
1, subsequently if same interrupts event occurs again, still no
interrupt will be triggered.

As a workaround, all RVUM interrupt lines should be cleared between
MSIXEN=0 and MSIXEN=1.

Signed-off-by: Harman Kalra <hkalra at marvell.com>
---
 drivers/common/cnxk/roc_dev.c | 35 +++++++++++++++++++++++++++++++++++
 1 file changed, 35 insertions(+)

diff --git a/drivers/common/cnxk/roc_dev.c b/drivers/common/cnxk/roc_dev.c
index 4e204373dc..ce6980cbe4 100644
--- a/drivers/common/cnxk/roc_dev.c
+++ b/drivers/common/cnxk/roc_dev.c
@@ -884,6 +884,38 @@ vf_flr_register_irqs(struct plt_pci_device *pci_dev, struct dev *dev)
 	return 0;
 }
 
+static void
+clear_rvum_interrupts(struct dev *dev)
+{
+	uint64_t intr;
+	int i;
+
+	if (dev_is_vf(dev)) {
+		/* Clear VF mbox interrupt */
+		intr = plt_read64(dev->bar2 + RVU_VF_INT);
+		if (intr)
+			plt_write64(intr, dev->bar2 + RVU_VF_INT);
+	} else {
+		/* Clear AF PF interrupt line */
+		intr = plt_read64(dev->bar2 + RVU_PF_INT);
+		if (intr)
+			plt_write64(intr, dev->bar2 + RVU_PF_INT);
+		for (i = 0; i < MAX_VFPF_DWORD_BITS; ++i) {
+			/* Clear MBOX interrupts */
+			intr = plt_read64(dev->bar2 + RVU_PF_VFPF_MBOX_INTX(i));
+			if (intr)
+				plt_write64(intr,
+					    dev->bar2 +
+						    RVU_PF_VFPF_MBOX_INTX(i));
+			/* Clear VF FLR interrupts */
+			intr = plt_read64(dev->bar2 + RVU_PF_VFFLR_INTX(i));
+			if (intr)
+				plt_write64(intr,
+					    dev->bar2 + RVU_PF_VFFLR_INTX(i));
+		}
+	}
+}
+
 int
 dev_active_vfs(struct dev *dev)
 {
@@ -1090,6 +1122,9 @@ dev_init(struct dev *dev, struct plt_pci_device *pci_dev)
 		intr_offset = RVU_PF_INT;
 	}
 
+	/* Clear all RVUM interrupts */
+	clear_rvum_interrupts(dev);
+
 	/* Initialize the local mbox */
 	rc = mbox_init(&dev->mbox_local, mbox, bar2, direction, 1, intr_offset);
 	if (rc)
-- 
2.18.0