linux-kernel - [PATCH 05/12] PCI/switchtec: Move check event id from mask_event() to switchtec_event

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Date:   Mon,  6 Jan 2020 12:03:30 -0700
From:   Logan Gunthorpe <logang@...tatee.com>
To:     linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
        Bjorn Helgaas <bhelgaas@...gle.com>
Cc:     Kelvin.Cao@...rochip.com, Eric Pilmore <epilmore@...aio.com>,
        Doug Meyer <dmeyer@...aio.com>,
        Wesley Sheng <wesley.sheng@...rochip.com>,
        Logan Gunthorpe <logang@...tatee.com>
Subject: [PATCH 05/12] PCI/switchtec: Move check event id from mask_event() to switchtec_event_isr()

From: Wesley Sheng <wesley.sheng@...rochip.com>

Event id check doesn't depend on anything in the mask_all_events()
to mask_event() path, doing it in switchtec_event_isr() would
avoid the CSR read in mask_event().

Signed-off-by: Wesley Sheng <wesley.sheng@...rochip.com>
Signed-off-by: Logan Gunthorpe <logang@...tatee.com>
---
 drivers/pci/switch/switchtec.c | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/drivers/pci/switch/switchtec.c b/drivers/pci/switch/switchtec.c
index 231499da2899..05d4cb49219b 100644
--- a/drivers/pci/switch/switchtec.c
+++ b/drivers/pci/switch/switchtec.c
@@ -1180,10 +1180,6 @@ static int mask_event(struct switchtec_dev *stdev, int eid, int idx)
 	if (!(hdr & SWITCHTEC_EVENT_OCCURRED && hdr & SWITCHTEC_EVENT_EN_IRQ))
 		return 0;
 
-	if (eid == SWITCHTEC_IOCTL_EVENT_LINK_STATE ||
-	    eid == SWITCHTEC_IOCTL_EVENT_MRPC_COMP)
-		return 0;
-
 	dev_dbg(&stdev->dev, "%s: %d %d %x\n", __func__, eid, idx, hdr);
 	hdr &= ~(SWITCHTEC_EVENT_EN_IRQ | SWITCHTEC_EVENT_OCCURRED);
 	iowrite32(hdr, hdr_reg);
@@ -1230,8 +1226,13 @@ static irqreturn_t switchtec_event_isr(int irq, void *dev)
 
 	check_link_state_events(stdev);
 
-	for (eid = 0; eid < SWITCHTEC_IOCTL_MAX_EVENTS; eid++)
+	for (eid = 0; eid < SWITCHTEC_IOCTL_MAX_EVENTS; eid++) {
+		if (eid == SWITCHTEC_IOCTL_EVENT_LINK_STATE ||
+		    eid == SWITCHTEC_IOCTL_EVENT_MRPC_COMP)
+			continue;
+
 		event_count += mask_all_events(stdev, eid);
+	}
 
 	if (event_count) {
 		atomic_inc(&stdev->event_cnt);
-- 
2.20.1