Le 21/11/2016 à 22:10, Matthew R. Ochs a écrit :
Some IBM CXL devices can take up to ~120ms to complete a VPD access transaction when under heavy load. With an existing default VPD timeout of 50ms, reads/writes can fail despite there not being an issue with the underlying hardware. To avoid these false failures, increase the VPD wait timeout for certain CXL devices to a value that allows appropriate VPD access delay when faced with a worst-case scenario. Signed-off-by: Matthew R. Ochs <mrochs@xxxxxxxxxxxxxxxxxx> ---
If the new pci API gets in, then I'm ok with the cxl change, at least for now. For longer term, we should consider opening up the cxl kernel API to give access to the new pci API so that it can be tuned by the AFU driver directly, since it would know better than cxl what the proper vpd access timeout should be.
Acked-by: Frederic Barrat <fbarrat@xxxxxxxxxxxxxxxxxx> Fred -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
