On Tue, Aug 08, 2017 at 08:57:24PM -0400, Sinan Kaya wrote: > Sporadic reset issues have been observed with Intel 750 NVMe drive by > writing to the reset file in sysfs in a loop. The sequence of events > observed is as follows: > > - perform a Function Level Reset (FLR) > - sleep up to 1000ms total > - read ~0 from PCI_COMMAND > - warn that the device didn't return from FLR > - touch the device before it's ready > > An endpoint is allowed to issue Configuration Request Retry Status (CRS) > following a FLR request to indicate that it is not ready to accept new > requests. CRS is defined in PCIe r3.1, sec 2.3.1. Request Handling Rules > and CRS usage in FLR context is mentioned in PCIe r3.1a, sec 6.6.2. > Function-Level Reset. Don't we have a similar issue for other types of reset? I would think conventional reset, e.g., using secondary bus reset, hotplug slot power, power management, etc., would have the same situation where a device might return CRS status.
