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[1/3] PCI: Allow quirks to override SRIOV BARs.

Message ID 1442529694-1792-2-git-send-email-ddaney.cavm@gmail.com
State Superseded
Headers show

Commit Message

David Daney Sept. 17, 2015, 10:41 p.m. UTC 
From: David Daney <david.daney@cavium.com>

Devices with fixed BARs can install BAR resources with
IORESOURCE_PCI_FIXED from the header fixup.  Allow this to work with
the SRIOV BARs as well by testing if the BAR resource has already been
set before attempting to read it from the config space.

Signed-off-by: David Daney <david.daney@cavium.com>
---
 drivers/pci/iov.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)
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Patch

diff --git a/drivers/pci/iov.c b/drivers/pci/iov.c
index ee0ebff..f8a6e1e 100644
--- a/drivers/pci/iov.c
+++ b/drivers/pci/iov.c
@@ -436,8 +436,13 @@  found:
 	nres = 0;
 	for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) {
 		res = &dev->resource[i + PCI_IOV_RESOURCES];
-		bar64 = __pci_read_base(dev, pci_bar_unknown, res,
-					pos + PCI_SRIOV_BAR + i * 4);
+		if (res->flags)
+			/* Already populated by quirks, just set bar64. */
+			bar64 = (res->flags & IORESOURCE_MEM_64) ? 1 : 0;
+		else
+			bar64 = __pci_read_base(dev, pci_bar_unknown, res,
+						pos + PCI_SRIOV_BAR + i * 4);
+
 		if (!res->flags)
 			continue;
 		if (resource_size(res) & (PAGE_SIZE - 1)) {