scsi: ufs: Optimize host lock on transfer requests send/compl paths
Current UFS IRQ handler is completely wrapped by host lock, and because ufshcd_send_command() is also protected by host lock, when IRQ handler fires, not only the CPU running the IRQ handler cannot send new requests, the rest CPUs can neither. Move the host lock wrapping the IRQ handler into specific branches, i.e., ufshcd_uic_cmd_compl(), ufshcd_check_errors(), ufshcd_tmc_handler() and ufshcd_transfer_req_compl(). Meanwhile, to further reduce occpuation of host lock in ufshcd_transfer_req_compl(), host lock is no longer required to call __ufshcd_transfer_req_compl(). As per test, the optimization can bring considerable gain to random read/write performance. Link: https://lore.kernel.org/r/1621845419-14194-3-git-send-email-cang@codeaurora.org Cc: Stanley Chu <stanley.chu@mediatek.com> Reported-by:kernel test robot <lkp@intel.com> Reviewed-by:
Bean Huo <beanhuo@micron.com> Reviewed-by:
Stanley Chu <stanley.chu@mediatek.com> Co-developed-by:
Asutosh Das <asutoshd@codeaurora.org> Signed-off-by:
Asutosh Das <asutoshd@codeaurora.org> Signed-off-by:
Can Guo <cang@codeaurora.org> Signed-off-by:
Martin K. Petersen <martin.petersen@oracle.com>
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