v0->v1: Update MPS parameters as non-arch and add MRRS
description into pcie_bus_perf parameter suggested
by Andrew Murray.
v1->v2: Update some semantic problems and add MPS and MRRS
explanation suggested by Joe Lawrence and Randy Dunlap.
v2->v3: Update some semantic problems and the description
of pcie_bus_safe and pcie_bus_peer2peer suggested
by Bjorn Helgaas.
v3->v4: Update pcie_bus_safe description suggested by Jon Mason
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 <jdma...@kudzu.us> at
commit 5f39e6705 and commit b03e7495a8.
Signed-off-by: Yijing Wang <wangyij...@huawei.com>
---
Documentation/kernel-parameters.txt | 14 ++++++++++++++
1 files changed, 14 insertions(+), 0 deletions(-)
diff --git a/Documentation/kernel-parameters.txt
b/Documentation/kernel-parameters.txt
index 363e348..6ad9b95 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -2227,6 +2227,20 @@ 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 PCIe MPS (Max Payload Size)
+ tuning and use the BIOS-configured MPS defaults.
+ pcie_bus_safe Set every device's MPS to the largest MPSS
+ (Max Payload Size Support) common to all devices
+ below the root complex.
+ pcie_bus_perf Configure device MPS to the largest
+ allowable MPS based on its parent bus. Also set
+ MRRS (Max Read Request Size) to the largest
supported
+ value (no larger than the MPS that the device
or bus
+ can support) for best performance.
+ pcie_bus_peer2peer Set every device's MPS to 128B, which
+ every device is guaranteed to support. This
+ configuration allows peer-to-peer DMA between
any pair
+ of devices possibly at the cost of reduced
performance.
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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