linux-kernel - [PATCH v4 5/5] misc: pci_endpoint_test: Handle 64-bit BARs properly

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Date:   Thu,  8 Mar 2018 14:33:30 +0100
From:   Niklas Cassel <niklas.cassel@...s.com>
To:     kishon@...com, Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Niklas Cassel <niklass@...s.com>, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v4 5/5] misc: pci_endpoint_test: Handle 64-bit BARs properly

A 64-bit BAR consists of a BAR pair, where the second BAR has the
upper bits, so we cannot simply call pci_ioremap_bar() on every single
BAR index.

The second BAR in a BAR pair will not have the IORESOURCE_MEM resource
flag set. Only call ioremap on BARs that have the IORESOURCE_MEM
resource flag set.

pci 0000:01:00.0: BAR 4: assigned [mem 0xc0300000-0xc031ffff 64bit]
pci 0000:01:00.0: BAR 2: assigned [mem 0xc0320000-0xc03203ff 64bit]
pci 0000:01:00.0: BAR 0: assigned [mem 0xc0320400-0xc03204ff 64bit]
pci-endpoint-test 0000:01:00.0: can't ioremap BAR 1: [??? 0x00000000 flags 0x0]
pci-endpoint-test 0000:01:00.0: failed to read BAR1
pci-endpoint-test 0000:01:00.0: can't ioremap BAR 3: [??? 0x00000000 flags 0x0]
pci-endpoint-test 0000:01:00.0: failed to read BAR3
pci-endpoint-test 0000:01:00.0: can't ioremap BAR 5: [??? 0x00000000 flags 0x0]
pci-endpoint-test 0000:01:00.0: failed to read BAR5

Signed-off-by: Niklas Cassel <niklas.cassel@...s.com>
---
 drivers/misc/pci_endpoint_test.c | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/drivers/misc/pci_endpoint_test.c b/drivers/misc/pci_endpoint_test.c
index 320276f42653..fe8897e64635 100644
--- a/drivers/misc/pci_endpoint_test.c
+++ b/drivers/misc/pci_endpoint_test.c
@@ -534,12 +534,14 @@ static int pci_endpoint_test_probe(struct pci_dev *pdev,
 	}
 
 	for (bar = BAR_0; bar <= BAR_5; bar++) {
-		base = pci_ioremap_bar(pdev, bar);
-		if (!base) {
-			dev_err(dev, "failed to read BAR%d\n", bar);
-			WARN_ON(bar == test_reg_bar);
+		if (pci_resource_flags(pdev, bar) & IORESOURCE_MEM) {
+			base = pci_ioremap_bar(pdev, bar);
+			if (!base) {
+				dev_err(dev, "failed to read BAR%d\n", bar);
+				WARN_ON(bar == test_reg_bar);
+			}
+			test->bar[bar] = base;
 		}
-		test->bar[bar] = base;
 	}
 
 	test->base = test->bar[test_reg_bar];
-- 
2.14.2