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@axis.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Acked-by: Kishon Vijay Abraham I <kishon@ti.com>

1 files 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];