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scsi: ufs: Add trace event for UIC commands 

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

Link: https://lore.kernel.org/r/20200615072235.23042-3-stanley.chu@mediatek.com
Acked-by: Avri Altman <avri.altman@wdc.com>
Signed-off-by: Stanley Chu <stanley.chu@mediatek.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Stanley Chu 2020-06-15 15:22:35 +08:00 committed by Martin K. Petersen
parent 7a7df52dbc
commit aa5c697988
2 changed files with 57 additions and 0 deletions
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26
drivers/scsi/ufs/ufshcd.c
View File

@ -311,6 +311,26 @@ 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)
{
@ -2030,6 +2050,8 @@ 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);
@ -4835,6 +4857,10 @@ static irqreturn_t ufshcd_uic_cmd_compl(struct ufs_hba *hba, u32 intr_status)
complete(hba->uic_async_done);
retval = IRQ_HANDLED;
}
if (retval == IRQ_HANDLED)
ufshcd_add_uic_command_trace(hba, hba->active_uic_cmd,
"complete");
return retval;
}

31
include/trace/events/ufs.h
View File

@ -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),