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PCI: Work around Ivytown NTB BAR size issue

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Certain NTB devices have a hardware erratum where, regardless of
pre-configured value, reading the BAR size returns 4096.  To work around
this issue, add a PCI quirk to read the appropriate values from an
alternative register in PCI config space and move the resource endpoints
to the appropriate location.

Signed-off-by: Jon Mason <jon.mason@intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
This commit is contained in:
Jon Mason 2013-05-06 08:03:33 +00:00 committed by Bjorn Helgaas
parent f722406faa
commit 12b03188ab
1 changed files with 25 additions and 0 deletions
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25
drivers/pci/quirks.c
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@ -2865,6 +2865,31 @@ DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x65f9, quirk_intel_mc_errata);
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x65fa, quirk_intel_mc_errata);
/*
* Ivytown NTB BAR sizes are misreported by the hardware due to an erratum. To
* work around this, query the size it should be configured to by the device and
* modify the resource end to correspond to this new size.
*/
static void quirk_intel_ntb(struct pci_dev *dev)
{
int rc;
u8 val;
rc = pci_read_config_byte(dev, 0x00D0, &val);
if (rc)
return;
dev->resource[2].end = dev->resource[2].start + ((u64) 1 << val) - 1;
rc = pci_read_config_byte(dev, 0x00D1, &val);
if (rc)
return;
dev->resource[4].end = dev->resource[4].start + ((u64) 1 << val) - 1;
}
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x0e08, quirk_intel_ntb);
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x0e0d, quirk_intel_ntb);
static ktime_t fixup_debug_start(struct pci_dev *dev,
void (*fn)(struct pci_dev *dev))
{