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| author | Jon Mason <jon.mason@intel.com> | 2013-05-06 08:03:33 +0000 |
|---|---|---|
| committer | Bjorn Helgaas <bhelgaas@google.com> | 2013-05-15 10:51:14 -0600 |
| commit | 12b03188ab2afed784e416b4fb1366b4a6915ac0 (patch) | |
| tree | 1ada2cce42bae495af2780f002c387b707b05aee | |
| parent | f722406faae2d073cc1d01063d1123c35425939e (diff) | |
| download | op-kernel-dev-12b03188ab2afed784e416b4fb1366b4a6915ac0.zip op-kernel-dev-12b03188ab2afed784e416b4fb1366b4a6915ac0.tar.gz | |
PCI: Work around Ivytown NTB BAR size issue
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>
| -rw-r--r-- | drivers/pci/quirks.c | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c index 7d68aee..7f49257 100644 --- a/drivers/pci/quirks.c +++ b/drivers/pci/quirks.c @@ -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)) { |
