From: Xiang Chen <chenxiang66@xxxxxxxxxxxxx>
To support IO_URING IOPOLL support for hisi_sas, need to do:
- Add and fill mq_poll interface to poll queue;
- For internal IOs (including internal abort IOs), need to deliver and
complete them through non-iopoll queue (queue 0);
It only sends internal abort commands to non-poll queue which actually
requires to send a internal abort command to every queue, so it still has
a risk. Make iopoll support module parameter as "experimental".
I have tested performance on v3 hw with different modes as following, and
it promotes much for 4K READ/WRITE when enabling poll momde:
4K READ 4K RANDREAD 4K WRITE 4K RANDWRITE
interrupt + libaio 1770k 1316k 1197k 831k
interrupt + io_uring 1848k 1390k 1238k 857k
iopoll + io_uring 2117k 1364k 1874k 849k
Xiang Chen (4):
scsi: hisi_sas: Add function complete_v3_hw()
scsi: hisi_sas: Add poll support for v3 hw
scsi: hisi_sas: Sync complete queue for poll queue
scsi: hisi_sas: Add device attribute experimental_iopoll_q_cnt for v3
hw
drivers/scsi/hisi_sas/hisi_sas.h | 6 +-
drivers/scsi/hisi_sas/hisi_sas_main.c | 95 ++++++++++++++++++++++--------
drivers/scsi/hisi_sas/hisi_sas_v3_hw.c | 102 +++++++++++++++++++++++++++++----
3 files changed, 167 insertions(+), 36 deletions(-)
--
2.8.1
