[PATCH v2 2/2] scsi: ufs: Add trace event for UIC commands

Stanley Chu
2020-06-15T06:51:38Z

Use the ftrace infrastructure to conditionally trace UFS UIC command
events.

New trace event "ufshcd_uic_command" is created, which samples the
following UFS UIC command data:
- Device name
- Optional identification string
- UIC command opcode
- UIC command argument1
- UIC command argument2
- UIC command argement3

Usage:
echo 1 > /sys/kernel/debug/tracing/events/ufs/enable
cat /sys/kernel/debug/tracing/trace_pipe

Signed-off-by: Stanley Chu <stanley.chu@mediatek.com>
Acked-by: Avri Altman <avri.altman@wdc.com>
---
drivers/scsi/ufs/ufshcd.c | 26 ++++++++++++++++++++++++++
include/trace/events/ufs.h | 31 +++++++++++++++++++++++++++++++
2 files changed, 57 insertions(+)

diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index ad4fc829cbb2..1fd2fd526c68 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -340,6 +340,26 @@ static void ufshcd_add_tm_upiu_trace(struct ufs_hba *hba, unsigned int tag,
&descp->input_param1);
}

+static void ufshcd_add_uic_command_trace(struct ufs_hba *hba,
+ struct uic_command *ucmd,
+ const char *str)
+{
+ u32 cmd;
+
+ if (!trace_ufshcd_uic_command_enabled())
+ return;
+
+ if (!strcmp(str, "send"))
+ cmd = ucmd->command;
+ else
+ cmd = ufshcd_readl(hba, REG_UIC_COMMAND);
+
+ trace_ufshcd_uic_command(dev_name(hba->dev), str, cmd,
+ ufshcd_readl(hba, REG_UIC_COMMAND_ARG_1),
+ ufshcd_readl(hba, REG_UIC_COMMAND_ARG_2),
+ ufshcd_readl(hba, REG_UIC_COMMAND_ARG_3));
+}
+
static void ufshcd_add_command_trace(struct ufs_hba *hba,
unsigned int tag, const char *str)
{
@@ -2052,6 +2072,8 @@ ufshcd_dispatch_uic_cmd(struct ufs_hba *hba, struct uic_command *uic_cmd)
ufshcd_writel(hba, uic_cmd->argument2, REG_UIC_COMMAND_ARG_2);
ufshcd_writel(hba, uic_cmd->argument3, REG_UIC_COMMAND_ARG_3);

+ ufshcd_add_uic_command_trace(hba, uic_cmd, "send");
+
/* Write UIC Cmd */
ufshcd_writel(hba, uic_cmd->command & COMMAND_OPCODE_MASK,
REG_UIC_COMMAND);
@@ -4825,11 +4847,15 @@ static irqreturn_t ufshcd_uic_cmd_compl(struct ufs_hba *hba, u32 intr_status)
ufshcd_get_uic_cmd_result(hba);
hba->active_uic_cmd->argument3 =
ufshcd_get_dme_attr_val(hba);
+ ufshcd_add_uic_command_trace(hba, hba->active_uic_cmd,
+ "complete");
complete(&hba->active_uic_cmd->done);
retval = IRQ_HANDLED;
}

if ((intr_status & UFSHCD_UIC_PWR_MASK) && hba->uic_async_done) {
+ ufshcd_add_uic_command_trace(hba, hba->active_uic_cmd,
+ "complete");
complete(hba->uic_async_done);
retval = IRQ_HANDLED;
}
diff --git a/include/trace/events/ufs.h b/include/trace/events/ufs.h
index 5f300739240d..84841b3a7ffd 100644
--- a/include/trace/events/ufs.h
+++ b/include/trace/events/ufs.h
@@ -249,6 +249,37 @@ TRACE_EVENT(ufshcd_command,
)
);

+TRACE_EVENT(ufshcd_uic_command,
+ TP_PROTO(const char *dev_name, const char *str, u32 cmd,
+ u32 arg1, u32 arg2, u32 arg3),
+
+ TP_ARGS(dev_name, str, cmd, arg1, arg2, arg3),
+
+ TP_STRUCT__entry(
+ __string(dev_name, dev_name)
+ __string(str, str)
+ __field(u32, cmd)
+ __field(u32, arg1)
+ __field(u32, arg2)
+ __field(u32, arg3)
+ ),
+
+ TP_fast_assign(
+ __assign_str(dev_name, dev_name);
+ __assign_str(str, str);
+ __entry->cmd = cmd;
+ __entry->arg1 = arg1;
+ __entry->arg2 = arg2;
+ __entry->arg3 = arg3;
+ ),
+
+ TP_printk(
+ "%s: %s: cmd: 0x%x, arg1: 0x%x, arg2: 0x%x, arg3: 0x%x",
+ __get_str(str), __get_str(dev_name), __entry->cmd,
+ __entry->arg1, __entry->arg2, __entry->arg3
+ )
+);
+
TRACE_EVENT(ufshcd_upiu,
TP_PROTO(const char *dev_name, const char *str, void *hdr, void *tsf),