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| author | =?UTF-8?q?Christian=20K=C3=B6nig?= <ckoenig.leichtzumerken@gmail.com> | 2018-01-11 16:23:29 +0300 |
|---|---|---|
| committer | Bjorn Helgaas <helgaas@kernel.org> | 2018-01-11 20:22:39 +0300 |
| commit | f32ab7547161b9fa7ebfbc4f18ea1eb3fd49fe25 (patch) | |
| tree | f806a04056ffadf4bdc92e4d70e1ff1488c713b0 /arch/x86/pci/common.c | |
| parent | 1291a0d5049dbc06baaaf66a9ff3f53db493b19b (diff) | |
| download | linux-f32ab7547161b9fa7ebfbc4f18ea1eb3fd49fe25.tar.xz | |
x86/PCI: Add "pci=big_root_window" option for AMD 64-bit windows
Only try to enable a 64-bit window on AMD CPUs when "pci=big_root_window"
is specified.
This taints the kernel because the new 64-bit window uses address space we
don't know anything about, and it may contain unreported devices or memory
that would conflict with the window.
The pci_amd_enable_64bit_bar() quirk that enables the window is specific to
AMD CPUs. The generic solution would be to have the firmware enable the
window and describe it in the host bridge's _CRS method, or at least
describe it in the _PRS method so the OS would have the option of enabling
it.
Signed-off-by: Christian König <christian.koenig@amd.com>
[bhelgaas: changelog, extend doc, mention taint in dmesg]
Signed-off-by: Bjorn Helgaas <helgaas@kernel.org>
Diffstat (limited to 'arch/x86/pci/common.c')
| -rw-r--r-- | arch/x86/pci/common.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/arch/x86/pci/common.c b/arch/x86/pci/common.c index 7a5350d08cef..563049c483a1 100644 --- a/arch/x86/pci/common.c +++ b/arch/x86/pci/common.c @@ -594,6 +594,11 @@ char *__init pcibios_setup(char *str) } else if (!strcmp(str, "nocrs")) { pci_probe |= PCI_ROOT_NO_CRS; return NULL; +#ifdef CONFIG_PHYS_ADDR_T_64BIT + } else if (!strcmp(str, "big_root_window")) { + pci_probe |= PCI_BIG_ROOT_WINDOW; + return NULL; +#endif } else if (!strcmp(str, "earlydump")) { pci_early_dump_regs = 1; return NULL; |