mirror of
https://github.com/FEX-Emu/linux.git
synced 2025-01-02 07:11:12 +00:00
03db42adfe
PCI device BARs are guaranteed to start and end on at least a four-byte
(I/O) or a sixteen-byte (MMIO) boundary because they're aligned on their
size and the low BAR bits are reserved. PCI-to-PCI bridge apertures
have even larger alignment restrictions.
However, some BIOSes (e.g., HP DL360 BIOS P31) report host bridge windows
like "[io 0x0000-0x2cfe]". This is wrong because it excludes the last
port at 0x2cff: it's impossible for a downstream device to claim 0x2cfe
without also claiming 0x2cff. In fact, this BIOS configures a device
behind the bridge to "[io 0x2c00-0x2cff]", so we know the window actually
does include 0x2cff.
This patch rounds the start and end of apertures to the appropriate
boundary. I experimentally determined that Windows contains a similar
workaround; details here:
http://bugzilla.kernel.org/show_bug.cgi?id=14337
Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
|
||
|---|---|---|
| .. | ||
| boot | ||
| configs | ||
| crypto | ||
| ia32 | ||
| include/asm | ||
| kernel | ||
| kvm | ||
| lguest | ||
| lib | ||
| math-emu | ||
| mm | ||
| oprofile | ||
| pci | ||
| power | ||
| vdso | ||
| video | ||
| xen | ||
| Kbuild | ||
| Kconfig | ||
| Kconfig.cpu | ||
| Kconfig.debug | ||
| Makefile | ||
| Makefile_32.cpu | ||