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authorAndrew Patterson <andrew.patterson@hp.com>2009-04-22 16:52:09 -0600
committerJesse Barnes <jbarnes@virtuousgeek.org>2009-06-11 12:04:21 -0700
commit43c16408842b0eeb367c23a6fa540ce69f99e347 (patch)
tree25be054b280b430b8bb00ff5f9c1f422bc21a3a0 /samples
parentf62795f1e892ca9269849fa83de97621da7e02c0 (diff)
downloadop-kernel-dev-43c16408842b0eeb367c23a6fa540ce69f99e347.zip
op-kernel-dev-43c16408842b0eeb367c23a6fa540ce69f99e347.tar.gz
PCI: Add support for turning PCIe ECRC on or off
Adds support for PCI Express transaction layer end-to-end CRC checking (ECRC). This patch will enable/disable ECRC checking by setting/clearing the ECRC Check Enable and/or ECRC Generation Enable bits for devices that support ECRC. The ECRC setting is controlled by the "pci=ecrc=<policy>" command-line option. If this option is not set or is set to 'bios", the enable and generation bits are left in whatever state that firmware/BIOS set them to. The "off" setting turns them off, and the "on" option turns them on (if the device supports it). Turning ECRC on or off can be a data integrity versus performance tradeoff. In theory, turning it on will catch more data errors, turning it off means possibly better performance since CRC does not need to be calculated by the PCIe hardware and packet sizes are reduced. Signed-off-by: Andrew Patterson <andrew.patterson@hp.com> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
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