On 14/11/20 2:33 am, Christophe Lombard wrote:
OpenCAPI 4.0/5.0 with TLBI/SLBI Snooping, is not used due to performance
problems caused by the PAU having to process all incoming TLBI/SLBI
commands which will cause them to back up on the PowerBus.
When the Address Translation Mode requires TLB and SLB Invalidate
operations to be initiated using MMIO registers, a set of registers like
the following is used:
• XTS MMIO ATSD0 LPARID register
• XTS MMIO ATSD0 AVA register
• XTS MMIO ATSD0 launch register, write access initiates a shoot down
• XTS MMIO ATSD0 status register
The MMIO based mechanism also blocks the NPU/PAU from snooping TLBIE
commands from the PowerBus.
The Shootdown commands (ATSD) will be generated using MMIO registers
in the NPU/PAU and sent to the device.
Signed-off-by: Christophe Lombard <clomb...@linux.vnet.ibm.com>
snowpatch has reported some minor checkpatch issues:
https://openpower.xyz/job/snowpatch/job/snowpatch-linux-checkpatch/16267//artifact/linux/checkpatch.log
--
Andrew Donnellan OzLabs, ADL Canberra
a...@linux.ibm.com IBM Australia Limited
