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authorBjorn Helgaas <bhelgaas@google.com>2011-06-14 13:04:29 -0600
committerJesse Barnes <jbarnes@virtuousgeek.org>2011-07-22 09:06:58 -0700
commit8d6a6a47636648754dc371b01228520a2adaf430 (patch)
tree5bab37b155798d9db8549fe6ee28499b1a5633c5 /drivers/pci
parentc9b378c7cbf623649e4ca64f955f2afd12ef01b2 (diff)
PCI: treat mem BAR type "11" (reserved) as 32-bit, not 64-bit, BAR
This fixes a minor regression where broken PCI devices that use the reserved "11" memory BAR type worked before e354597cce but not after. The low four bits of a memory BAR are "PTT0" where P=1 for prefetchable BARs, and TT is as follows: 00 32-bit BAR, anywhere in lower 4GB 01 anywhere below 1MB (reserved as of PCI 2.2) 10 64-bit BAR 11 reserved Prior to e354597cce, we treated "0100" as a 64-bit BAR and all others, including prefetchable 64-bit BARs ("1100") as 32-bit BARs. The e354597cce fix, which appeared in 2.6.28, treats "x1x0" as 64-bit BARs, so the reserved "x110" types are treated as 64-bit instead of 32-bit. This patch returns to treating the reserved "11" type as a 32-bit BAR and adds a warning if we see it. It also logs a note if we see a 1M BAR. This is not a warning, because such hardware conforms to pre-PCI 2.2 spec, but I think it's worth noting because Linux ignores the 1M restriction if it ever has to assign the BAR. CC: Peter Chubb <peterc@gelato.unsw.edu.au> Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=35952 Reported-by: Jan Zwiegers <jan@radicalsystems.co.za> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Diffstat (limited to 'drivers/pci')
-rw-r--r--drivers/pci/probe.c22
1 files changed, 19 insertions, 3 deletions
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index f03ed96533d..3e7a00a3fc8 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -100,8 +100,11 @@ static u64 pci_size(u64 base, u64 maxbase, u64 mask)
return size;
}
-static inline enum pci_bar_type decode_bar(struct resource *res, u32 bar)
+static inline enum pci_bar_type decode_bar(struct pci_dev *dev,
+ struct resource *res, u32 bar)
{
+ u32 mem_type;
+
if ((bar & PCI_BASE_ADDRESS_SPACE) == PCI_BASE_ADDRESS_SPACE_IO) {
res->flags = bar & ~PCI_BASE_ADDRESS_IO_MASK;
return pci_bar_io;
@@ -109,8 +112,21 @@ static inline enum pci_bar_type decode_bar(struct resource *res, u32 bar)
res->flags = bar & ~PCI_BASE_ADDRESS_MEM_MASK;
- if (res->flags & PCI_BASE_ADDRESS_MEM_TYPE_64)
+ mem_type = bar & PCI_BASE_ADDRESS_MEM_TYPE_MASK;
+ switch (mem_type) {
+ case PCI_BASE_ADDRESS_MEM_TYPE_32:
+ break;
+ case PCI_BASE_ADDRESS_MEM_TYPE_1M:
+ dev_info(&dev->dev, "1M mem BAR treated as 32-bit BAR\n");
+ break;
+ case PCI_BASE_ADDRESS_MEM_TYPE_64:
return pci_bar_mem64;
+ default:
+ dev_warn(&dev->dev,
+ "mem unknown type %x treated as 32-bit BAR\n",
+ mem_type);
+ break;
+ }
return pci_bar_mem32;
}
@@ -164,7 +180,7 @@ int __pci_read_base(struct pci_dev *dev, enum pci_bar_type type,
l = 0;
if (type == pci_bar_unknown) {
- type = decode_bar(res, l);
+ type = decode_bar(dev, res, l);
res->flags |= pci_calc_resource_flags(l) | IORESOURCE_SIZEALIGN;
if (type == pci_bar_io) {
l &= PCI_BASE_ADDRESS_IO_MASK;