scsi: ufs: add trace event for ufs commands
Use the ftrace infrastructure to conditionally trace ufs command events. New trace event is created, which samples the following ufs command data: - device name - optional identification string - task tag - doorbell register - number of transfer bytes - interrupt status register - request start LBA - command opcode Currently we only fully trace read(10) and write(10) commands. All other commands which pass through ufshcd_send_command() will be printed with "-1" in the lba and transfer_len fields. Usage: echo 1 > /sys/kernel/debug/tracing/events/ufs/enable cat /sys/kernel/debug/tracing/trace_pipe Signed-off-by: Lee Susman <lsusman@codeaurora.org> Signed-off-by: Subhash Jadavani <subhashj@codeaurora.org> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
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@ -293,6 +293,41 @@ static inline void ufshcd_remove_non_printable(char *val)
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*val = ' ';
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*val = ' ';
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}
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}
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static void ufshcd_add_command_trace(struct ufs_hba *hba,
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unsigned int tag, const char *str)
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{
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sector_t lba = -1;
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u8 opcode = 0;
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u32 intr, doorbell;
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struct ufshcd_lrb *lrbp;
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int transfer_len = -1;
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if (!trace_ufshcd_command_enabled())
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return;
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lrbp = &hba->lrb[tag];
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if (lrbp->cmd) { /* data phase exists */
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opcode = (u8)(*lrbp->cmd->cmnd);
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if ((opcode == READ_10) || (opcode == WRITE_10)) {
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/*
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* Currently we only fully trace read(10) and write(10)
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* commands
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*/
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if (lrbp->cmd->request && lrbp->cmd->request->bio)
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lba =
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lrbp->cmd->request->bio->bi_iter.bi_sector;
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transfer_len = be32_to_cpu(
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lrbp->ucd_req_ptr->sc.exp_data_transfer_len);
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}
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}
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intr = ufshcd_readl(hba, REG_INTERRUPT_STATUS);
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doorbell = ufshcd_readl(hba, REG_UTP_TRANSFER_REQ_DOOR_BELL);
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trace_ufshcd_command(dev_name(hba->dev), str, tag,
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doorbell, transfer_len, intr, lba, opcode);
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}
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static void ufshcd_print_host_regs(struct ufs_hba *hba)
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static void ufshcd_print_host_regs(struct ufs_hba *hba)
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{
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{
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/*
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/*
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@ -1166,6 +1201,7 @@ void ufshcd_send_command(struct ufs_hba *hba, unsigned int task_tag)
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ufshcd_writel(hba, 1 << task_tag, REG_UTP_TRANSFER_REQ_DOOR_BELL);
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ufshcd_writel(hba, 1 << task_tag, REG_UTP_TRANSFER_REQ_DOOR_BELL);
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/* Make sure that doorbell is committed immediately */
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/* Make sure that doorbell is committed immediately */
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wmb();
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wmb();
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ufshcd_add_command_trace(hba, task_tag, "send");
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}
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}
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/**
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/**
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@ -3955,6 +3991,7 @@ static void __ufshcd_transfer_req_compl(struct ufs_hba *hba,
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lrbp = &hba->lrb[index];
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lrbp = &hba->lrb[index];
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cmd = lrbp->cmd;
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cmd = lrbp->cmd;
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if (cmd) {
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if (cmd) {
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ufshcd_add_command_trace(hba, index, "complete");
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result = ufshcd_transfer_rsp_status(hba, lrbp);
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result = ufshcd_transfer_rsp_status(hba, lrbp);
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scsi_dma_unmap(cmd);
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scsi_dma_unmap(cmd);
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cmd->result = result;
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cmd->result = result;
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@ -3966,8 +4003,11 @@ static void __ufshcd_transfer_req_compl(struct ufs_hba *hba,
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__ufshcd_release(hba);
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__ufshcd_release(hba);
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} else if (lrbp->command_type == UTP_CMD_TYPE_DEV_MANAGE ||
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} else if (lrbp->command_type == UTP_CMD_TYPE_DEV_MANAGE ||
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lrbp->command_type == UTP_CMD_TYPE_UFS_STORAGE) {
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lrbp->command_type == UTP_CMD_TYPE_UFS_STORAGE) {
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if (hba->dev_cmd.complete)
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if (hba->dev_cmd.complete) {
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ufshcd_add_command_trace(hba, index,
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"dev_complete");
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complete(hba->dev_cmd.complete);
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complete(hba->dev_cmd.complete);
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}
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}
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}
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}
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}
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@ -219,6 +219,44 @@ DEFINE_EVENT(ufshcd_template, ufshcd_init,
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TP_PROTO(const char *dev_name, int err, s64 usecs,
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TP_PROTO(const char *dev_name, int err, s64 usecs,
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int dev_state, int link_state),
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int dev_state, int link_state),
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TP_ARGS(dev_name, err, usecs, dev_state, link_state));
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TP_ARGS(dev_name, err, usecs, dev_state, link_state));
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TRACE_EVENT(ufshcd_command,
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TP_PROTO(const char *dev_name, const char *str, unsigned int tag,
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u32 doorbell, int transfer_len, u32 intr, u64 lba,
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u8 opcode),
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TP_ARGS(dev_name, str, tag, doorbell, transfer_len, intr, lba, opcode),
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TP_STRUCT__entry(
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__string(dev_name, dev_name)
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__string(str, str)
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__field(unsigned int, tag)
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__field(u32, doorbell)
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__field(int, transfer_len)
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__field(u32, intr)
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__field(u64, lba)
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__field(u8, opcode)
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),
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TP_fast_assign(
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__assign_str(dev_name, dev_name);
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__assign_str(str, str);
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__entry->tag = tag;
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__entry->doorbell = doorbell;
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__entry->transfer_len = transfer_len;
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__entry->intr = intr;
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__entry->lba = lba;
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__entry->opcode = opcode;
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),
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TP_printk(
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"%s: %s: tag: %u, DB: 0x%x, size: %d, IS: %u, LBA: %llu, opcode: 0x%x",
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__get_str(str), __get_str(dev_name), __entry->tag,
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__entry->doorbell, __entry->transfer_len,
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__entry->intr, __entry->lba, (u32)__entry->opcode
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)
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);
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#endif /* if !defined(_TRACE_UFS_H) || defined(TRACE_HEADER_MULTI_READ) */
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#endif /* if !defined(_TRACE_UFS_H) || defined(TRACE_HEADER_MULTI_READ) */
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/* This part must be outside protection */
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/* This part must be outside protection */
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