Document PCIE BUS MPS parameters pcie_bus_tune_off, pcie_bus_safe,
pcie_bus_peer2peer, pcie_bus_perf into Documentation/kernel-parameters.txt.
These parameters were introduced by Jon Mason <ma...@myri.com> at
commit 5f39e6705 and commit b03e7495a8. Document these into
kernel-parameters.txt can help users to understand and use the parameters.
Signed-off-by: Yijing Wang <wangyij...@huawei.com>
---
Documentation/kernel-parameters.txt | 15 +++++++++++++++
1 files changed, 15 insertions(+), 0 deletions(-)
diff --git a/Documentation/kernel-parameters.txt
b/Documentation/kernel-parameters.txt
index 363e348..1fb269b 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -2227,6 +2227,21 @@ bytes respectively. Such letter suffixes can also be
entirely omitted.
This sorting is done to get a device
order compatible with older (<= 2.4) kernels.
nobfsort Don't sort PCI devices into breadth-first order.
+ pcie_bus_tune_off Disable PCI-E MPS turning and using
+ the BIOS configured MPS defaults.
+ pcie_bus_safe Use the smallest common denominator MPS
+ of the entire tree below a root complex for
every device
+ on that fabric. Can avoid inconsistent mps
problem caused
+ by hotplug.
+ pcie_bus_perf Configure pcie device MPS to the largest
allowable
+ MPS based on its parent bus. And also set MRRS
to the
+ largest supported value but cannot be
configured larger
+ than the MPS the device or the bus can support
for Max
+ performance.
+ pcie_bus_peer2peer Make the system wide MPS the smallest
+ possible value (128B).This configuration could
prevent it
+ from working by having the MPS on one root port
different
+ than the MPS on another.
cbiosize=nn[KMG] The fixed amount of bus space which is
reserved for the CardBus bridge's IO window.
The default value is 256 bytes.
--
1.7.1
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