lkml.org 
[lkml]   [2018]   [Mar]   [8]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH v4 5/5] misc: pci_endpoint_test: Handle 64-bit BARs properly
Date
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>
---
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
\
 
 \ /
  Last update: 2018-03-08 14:35    [W:0.145 / U:3.824 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site