• Kai-Heng Feng's avatar
    nvme-pci: prevent SK hynix PC400 from using Write Zeroes command · 5611ec2b
    Kai-Heng Feng authored
    After commit 6e02318e ("nvme: add support for the Write Zeroes
    command"), SK hynix PC400 becomes very slow with the following error
    message:
    
    [  224.567695] blk_update_request: operation not supported error, dev nvme1n1, sector 499384320 op 0x9:(WRITE_ZEROES) flags 0x1000000 phys_seg 0 prio class 0]
    
    SK Hynix PC400 has a buggy firmware that treats NLB as max value instead
    of a range, so the NLB passed isn't a valid value to the firmware.
    
    According to SK hynix there are three commands are affected:
    - Write Zeroes
    - Compare
    - Write Uncorrectable
    
    Right now only Write Zeroes is implemented, so disable it completely on
    SK hynix PC400.
    
    BugLink: https://bugs.launchpad.net/bugs/1872383
    Cc: kyounghwan sohn <kyounghwan.sohn@sk.com>
    Signed-off-by: default avatarKai-Heng Feng <kai.heng.feng@canonical.com>
    Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
    5611ec2b
pci.c 81.7 KB