Re: [Update][PATCH] PCI: Document PCIE BUS MPS parameters

[Randy Dunlap]

On 01/23/13 04:28, Yijing Wang wrote:
> 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 <mason@xxxxxxxx> 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 <wangyijing@xxxxxxxxxx>
> ---
>  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.

				    BIOS-configured

> +		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

s/mps/MPS/
i.e., use "MPS" consistently.

> +				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

"And also" is redundant.  Just say Also.

What is (are) MRRS?

> +				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

					         system-wide

> +				possible value (128B).This configuration could prevent it

				                      ^ Space before "This"

> +				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.
> 


-- 
~Randy
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