aboutsummaryrefslogtreecommitdiff
path: root/include
diff options
context:
space:
mode:
authorJon Mason <mason@myri.com>2011-10-03 09:50:20 -0500
committerLinus Torvalds <torvalds@linux-foundation.org>2011-10-04 09:52:28 -0700
commit5f39e6705faade2e89d119958a8c51b9b6e2c53c (patch)
treee9d69f2f465daeca7cdc452a3b19d702f15e98b0 /include
parent05faadcf59507e8eea57ffbeea9cbb14c9a2ab3d (diff)
downloadlinux-linaro-5f39e6705faade2e89d119958a8c51b9b6e2c53c.tar.gz
PCI: Disable MPS configuration by default
Add the ability to disable PCI-E MPS turning and using the BIOS configured MPS defaults. Due to the number of issues recently discovered on some x86 chipsets, make this the default behavior. Also, add the option for peer to peer DMA MPS configuration. Peer to peer DMA is outside the scope of this patch, but MPS configuration could prevent it from working by having the MPS on one root port different than the MPS on another. To work around this, simply make the system wide MPS the smallest possible value (128B). Signed-off-by: Jon Mason <mason@myri.com> Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include')
-rw-r--r--include/linux/pci.h3
1 files changed, 2 insertions, 1 deletions
diff --git a/include/linux/pci.h b/include/linux/pci.h
index 8c230cbcbb4..9fc01226055 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -621,8 +621,9 @@ struct pci_driver {
extern void pcie_bus_configure_settings(struct pci_bus *bus, u8 smpss);
enum pcie_bus_config_types {
- PCIE_BUS_PERFORMANCE,
+ PCIE_BUS_TUNE_OFF,
PCIE_BUS_SAFE,
+ PCIE_BUS_PERFORMANCE,
PCIE_BUS_PEER2PEER,
};