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| author | Gary Hade <garyhade@us.ibm.com> | 2011-11-15 00:42:16 +0100 |
|---|---|---|
| committer | Jesse Barnes <jbarnes@virtuousgeek.org> | 2012-01-06 21:10:32 +0100 |
| commit | ae5cd86455381282ece162966183d3f208c6fad7 (patch) | |
| tree | 542674bc3c49b910ff740122483619b694853737 | |
| parent | PCI: Fix PCI_EXP_TYPE_RC_EC value (diff) | |
| download | linux-ae5cd86455381282ece162966183d3f208c6fad7.tar.xz linux-ae5cd86455381282ece162966183d3f208c6fad7.zip | |
x86/PCI: Ignore CPU non-addressable _CRS reserved memory resources
This assures that a _CRS reserved host bridge window or window region is
not used if it is not addressable by the CPU. The new code either trims
the window to exclude the non-addressable portion or totally ignores the
window if the entire window is non-addressable.
The current code has been shown to be problematic with 32-bit non-PAE
kernels on systems where _CRS reserves resources above 4GB.
Signed-off-by: Gary Hade <garyhade@us.ibm.com>
Reviewed-by: Bjorn Helgaas <bhelgaas@google.com>
Cc: Thomas Renninger <trenn@novell.com>
Cc: linux-kernel@vger.kernel.org
Cc: stable@kernel.org
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
| -rw-r--r-- | arch/x86/pci/acpi.c | 18 |
1 files changed, 16 insertions, 2 deletions
diff --git a/arch/x86/pci/acpi.c b/arch/x86/pci/acpi.c index e662ceebd798..425500bb24e6 100644 --- a/arch/x86/pci/acpi.c +++ b/arch/x86/pci/acpi.c @@ -178,7 +178,7 @@ setup_resource(struct acpi_resource *acpi_res, void *data) struct acpi_resource_address64 addr; acpi_status status; unsigned long flags; - u64 start, end; + u64 start, orig_end, end; status = resource_to_addr(acpi_res, &addr); if (!ACPI_SUCCESS(status)) @@ -194,7 +194,21 @@ setup_resource(struct acpi_resource *acpi_res, void *data) return AE_OK; start = addr.minimum + addr.translation_offset; - end = addr.maximum + addr.translation_offset; + orig_end = end = addr.maximum + addr.translation_offset; + + /* Exclude non-addressable range or non-addressable portion of range */ + end = min(end, (u64)iomem_resource.end); + if (end <= start) { + dev_info(&info->bridge->dev, + "host bridge window [%#llx-%#llx] " + "(ignored, not CPU addressable)\n", start, orig_end); + return AE_OK; + } else if (orig_end != end) { + dev_info(&info->bridge->dev, + "host bridge window [%#llx-%#llx] " + "([%#llx-%#llx] ignored, not CPU addressable)\n", + start, orig_end, end + 1, orig_end); + } res = &info->res[info->res_num]; res->name = info->name; |