netdev - [PATCH] net/ibmvnic: Fix EOI when running in XIVE mode.

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Date:   Fri, 11 Oct 2019 07:52:54 +0200
From:   Cédric Le Goater <clg@...d.org>
To:     Juliet Kim <julietk@...ux.vnet.ibm.com>,
        Thomas Falcon <tlfalcon@...ux.ibm.com>
Cc:     John Allen <jallen@...ux.ibm.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        linuxppc-dev@...ts.ozlabs.org,
        "David S . Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        Cédric Le Goater <clg@...d.org>
Subject: [PATCH] net/ibmvnic: Fix EOI when running in XIVE mode.

pSeries machines on POWER9 processors can run with the XICS (legacy)
interrupt mode or with the XIVE exploitation interrupt mode. These
interrupt contollers have different interfaces for interrupt
management : XICS uses hcalls and XIVE loads and stores on a page.
H_EOI being a XICS interface the enable_scrq_irq() routine can fail
when the machine runs in XIVE mode.

Fix that by calling the EOI handler of the interrupt chip.

Fixes: f23e0643cd0b ("ibmvnic: Clear pending interrupt after device reset")
Signed-off-by: Cédric Le Goater <clg@...d.org>
---
 drivers/net/ethernet/ibm/ibmvnic.c | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/drivers/net/ethernet/ibm/ibmvnic.c b/drivers/net/ethernet/ibm/ibmvnic.c
index 2b073a3c0b84..f59d9a8e35e2 100644
--- a/drivers/net/ethernet/ibm/ibmvnic.c
+++ b/drivers/net/ethernet/ibm/ibmvnic.c
@@ -2878,12 +2878,10 @@ static int enable_scrq_irq(struct ibmvnic_adapter *adapter,
 
 	if (test_bit(0, &adapter->resetting) &&
 	    adapter->reset_reason == VNIC_RESET_MOBILITY) {
-		u64 val = (0xff000000) | scrq->hw_irq;
+		struct irq_desc *desc = irq_to_desc(scrq->irq);
+		struct irq_chip *chip = irq_desc_get_chip(desc);
 
-		rc = plpar_hcall_norets(H_EOI, val);
-		if (rc)
-			dev_err(dev, "H_EOI FAILED irq 0x%llx. rc=%ld\n",
-				val, rc);
+		chip->irq_eoi(&desc->irq_data);
 	}
 
 	rc = plpar_hcall_norets(H_VIOCTL, adapter->vdev->unit_address,
-- 
2.21.0