Add a new sysfs group which has nodes to monitor data/request transfer performance. This sysfs group has nodes showing total sectors/requests transferred, total busy time spent and max/min/avg/sum latencies. This group can be enhanced later to show more UFS driver layer performance data during runtime. It works like: /sys/bus/platform/drivers/ufshcd/*/monitor # echo 4096 > monitor_chunk_size /sys/bus/platform/drivers/ufshcd/*/monitor # echo 1 > monitor_enable /sys/bus/platform/drivers/ufshcd/*/monitor # grep ^ /dev/null * monitor_chunk_size:4096 monitor_enable:1 read_nr_requests:17 read_req_latency_avg:169 read_req_latency_max:594 read_req_latency_min:66 read_req_latency_sum:2887 read_total_busy:2639 read_total_sectors:136 write_nr_requests:116 write_req_latency_avg:440 write_req_latency_max:4921 write_req_latency_min:23 write_req_latency_sum:51052 write_total_busy:19584 write_total_sectors:928 Change since v3: - Rebased Change since v2: - Fixed a sparse error Change since v1: - Moved code from ufs-qcom.c to ufshcd.c Can Guo (2): scsi: ufs: Introduce hba performance monitor sysfs nodes scsi: ufs: Add support for hba performance monitor Documentation/ABI/testing/sysfs-driver-ufs | 126 +++++++++++++++ drivers/scsi/ufs/ufs-sysfs.c | 237 +++++++++++++++++++++++++++++ drivers/scsi/ufs/ufshcd.c | 62 ++++++++ drivers/scsi/ufs/ufshcd.h | 21 +++ 4 files changed, 446 insertions(+) -- Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux Foundation Collaborative Project.
