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Message-ID: <eded3ffe-882d-9514-9c9a-9c49d3a7a9a6@quicinc.com>
Date: Tue, 6 Feb 2024 12:25:30 +0530
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Subject: Re: [PATCH v11] bus: mhi: host: Add tracing support
Content-Language: en-US
To: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
CC: Manivannan Sadhasivam <mani@kernel.org>,
        Steven Rostedt
	<rostedt@goodmis.org>,
        Masami Hiramatsu <mhiramat@kernel.org>, <linux-kernel@vger.kernel.org>,
        <mhi@lists.linux.dev>, <linux-arm-msm@vger.kernel.org>,
        <linux-trace-kernel@vger.kernel.org>, <quic_vbadigan@quicinc.com>,
        <quic_ramkri@quicinc.com>, <quic_nitegupt@quicinc.com>,
        <quic_skananth@quicinc.com>, <quic_parass@quicinc.com>
References: <20240206-ftrace_support-v11-1-3f71dc187544@quicinc.com>
 <20240206062636.GA8333@thinkpad>
From: Krishna Chaitanya Chundru <quic_krichai@quicinc.com>
In-Reply-To: <20240206062636.GA8333@thinkpad>
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On 2/6/2024 11:56 AM, Manivannan Sadhasivam wrote:
> On Tue, Feb 06, 2024 at 10:02:05AM +0530, Krishna chaitanya chundru wrote:
>> This change adds ftrace support for following functions which
>> helps in debugging the issues when there is Channel state & MHI
>> state change and also when we receive data and control events:
>> 1. mhi_intvec_mhi_states
>> 2. mhi_process_data_event_ring
>> 3. mhi_process_ctrl_ev_ring
>> 4. mhi_gen_tre
>> 5. mhi_update_channel_state
>> 6. mhi_tryset_pm_state
>> 7. mhi_pm_st_worker
>>
>> Change the implementation of the arrays which has enum to strings mapping
>> to make it consistent in both trace header file and other files.
>>
>> Where ever the trace events are added, debug messages are removed.
>>
>> Signed-off-by: Krishna chaitanya chundru <quic_krichai@quicinc.com>
> 
> There are a lot of checkpatch errors. Please fix them and resubmit.
> 
> - Mani
> 
Hi Mani,

The errors which is pointing in the checkpatch are false positive, those
errors are being shown from v2 onwards and kernel test boot is also not
throwing any errors for it.

I checked with internal team they said these errors are false positive.

Thanks & Regards,
Krishna Chaitanya.

>> Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
>> Reviewed-by: "Steven Rostedt (Google)" <rostedt@goodmis.org>
>> ---
>> Changes in v11:
>> - Rebased with mhi next.
>> - Link to v10: https://lore.kernel.org/r/20240131-ftrace_support-v10-1-4349306b8f81@quicinc.com
>>
>> Changes in v10:
>> - Modified command_start and command_end traces to take string as input to mention correct
>> - string as suggested by mani
>> - As sugggested by mani modified the print format from lower format to upper case format.
>> - Link to v9: https://lore.kernel.org/r/20240105-ftrace_support-v9-1-a2dca64cc6ea@quicinc.com
>>
>> Changes in v9:
>> - Change the implementations of some array so that the strings to enum mapping
>> - is same in both trace header and other files as suggested by steve.
>> - Link to v8: https://lore.kernel.org/r/20231207-ftrace_support-v8-1-7f62d4558555@quicinc.com
>>
>> Changes in v8:
>> - Pass the structure and derefernce the variables in TP_fast_assign as suggested by steve
>> - Link to v7: https://lore.kernel.org/r/20231206-ftrace_support-v7-1-aca49a04268b@quicinc.com
>>
>> Changes in v7:
>> - change log format as pointed by mani.
>> - Link to v6: https://lore.kernel.org/r/20231204-ftrace_support-v6-1-9b206546dac2@quicinc.com
>>
>> Changes in v6:
>> - use 'rp' directly as suggested by jeffrey.
>> - Link to v5: https://lore.kernel.org/r/20231127-ftrace_support-v5-1-eb67daead4f1@quicinc.com
>>
>> Changes in v5:
>> - Use DECLARE_EVENT_CLASS for multiple events as suggested by steve.
>> - Instead of converting to u64 to print address, use %px to print the address to avoid
>> - warnings in some platforms.
>> - Link to v4: https://lore.kernel.org/r/20231111-ftrace_support-v4-1-c83602399461@quicinc.com
>>
>> Changes in v4:
>> - Fix compilation issues in previous patch which happended due to rebasing.
>> - In the defconfig FTRACE config is not enabled due to that the compilation issue is not
>> - seen in my workspace.
>> - Link to v3: https://lore.kernel.org/r/20231111-ftrace_support-v3-1-f358d2911a74@quicinc.com
>>
>> Changes in v3:
>> - move trace header file from include/trace/events to drivers/bus/mhi/host/ so that
>> - we can include driver header files.
>> - Use macros directly in the trace events as suggested Jeffrey Hugo.
>> - Reorder the structure in the events as suggested by steve to avoid holes in the buffer.
>> - removed the mhi_to_physical function as this can give security issues.
>> - removed macros to define strings as we can get those from driver headers.
>> - Link to v2: https://lore.kernel.org/r/20231013-ftrace_support-v2-1-6e893ce010b5@quicinc.com
>>
>> Changes in v2:
>> - Passing the raw state into the trace event and using  __print_symbolic() as suggested by bjorn.
>> - Change mhi_pm_st_worker to mhi_pm_st_transition as suggested by bjorn.
>> - Fixed the kernel test rebot issues.
>> - Link to v1: https://lore.kernel.org/r/20231005-ftrace_support-v1-1-23a2f394fa49@quicinc.com
>> ---
>>   drivers/bus/mhi/common.h        |  38 +++---
>>   drivers/bus/mhi/host/init.c     |  64 +++++----
>>   drivers/bus/mhi/host/internal.h |  41 ++++++
>>   drivers/bus/mhi/host/main.c     |  19 ++-
>>   drivers/bus/mhi/host/pm.c       |   7 +-
>>   drivers/bus/mhi/host/trace.h    | 280 ++++++++++++++++++++++++++++++++++++++++
>>   6 files changed, 384 insertions(+), 65 deletions(-)
>>
>> diff --git a/drivers/bus/mhi/common.h b/drivers/bus/mhi/common.h
>> index f794b9c8049e..dda340aaed95 100644
>> --- a/drivers/bus/mhi/common.h
>> +++ b/drivers/bus/mhi/common.h
>> @@ -297,30 +297,30 @@ struct mhi_ring_element {
>>   	__le32 dword[2];
>>   };
>>   
>> +#define MHI_STATE_LIST				\
>> +	mhi_state(RESET,	"RESET")	\
>> +	mhi_state(READY,	"READY")	\
>> +	mhi_state(M0,		"M0")		\
>> +	mhi_state(M1,		"M1")		\
>> +	mhi_state(M2,		"M2")		\
>> +	mhi_state(M3,		"M3")		\
>> +	mhi_state(M3_FAST,	"M3_FAST")	\
>> +	mhi_state(BHI,		"BHI")		\
>> +	mhi_state_end(SYS_ERR,	"SYS ERROR")
>> +
>> +#undef mhi_state
>> +#undef mhi_state_end
>> +
>> +#define mhi_state(a, b)		case MHI_STATE_##a: return b;
>> +#define mhi_state_end(a, b)	case MHI_STATE_##a: return b;
>> +
>>   static inline const char *mhi_state_str(enum mhi_state state)
>>   {
>>   	switch (state) {
>> -	case MHI_STATE_RESET:
>> -		return "RESET";
>> -	case MHI_STATE_READY:
>> -		return "READY";
>> -	case MHI_STATE_M0:
>> -		return "M0";
>> -	case MHI_STATE_M1:
>> -		return "M1";
>> -	case MHI_STATE_M2:
>> -		return "M2";
>> -	case MHI_STATE_M3:
>> -		return "M3";
>> -	case MHI_STATE_M3_FAST:
>> -		return "M3 FAST";
>> -	case MHI_STATE_BHI:
>> -		return "BHI";
>> -	case MHI_STATE_SYS_ERR:
>> -		return "SYS ERROR";
>> +	MHI_STATE_LIST
>>   	default:
>>   		return "Unknown state";
>>   	}
>> -};
>> +}
>>   
>>   #endif /* _MHI_COMMON_H */
>> diff --git a/drivers/bus/mhi/host/init.c b/drivers/bus/mhi/host/init.c
>> index 6d3b045ab259..944da46e6f11 100644
>> --- a/drivers/bus/mhi/host/init.c
>> +++ b/drivers/bus/mhi/host/init.c
>> @@ -20,51 +20,49 @@
>>   #include <linux/wait.h>
>>   #include "internal.h"
>>   
>> +#define CREATE_TRACE_POINTS
>> +#include "trace.h"
>> +
>>   static DEFINE_IDA(mhi_controller_ida);
>>   
>> +#undef mhi_ee
>> +#undef mhi_ee_end
>> +
>> +#define mhi_ee(a, b)		[MHI_EE_##a] = b,
>> +#define mhi_ee_end(a, b)	[MHI_EE_##a] = b,
>> +
>>   const char * const mhi_ee_str[MHI_EE_MAX] = {
>> -	[MHI_EE_PBL] = "PRIMARY BOOTLOADER",
>> -	[MHI_EE_SBL] = "SECONDARY BOOTLOADER",
>> -	[MHI_EE_AMSS] = "MISSION MODE",
>> -	[MHI_EE_RDDM] = "RAMDUMP DOWNLOAD MODE",
>> -	[MHI_EE_WFW] = "WLAN FIRMWARE",
>> -	[MHI_EE_PTHRU] = "PASS THROUGH",
>> -	[MHI_EE_EDL] = "EMERGENCY DOWNLOAD",
>> -	[MHI_EE_FP] = "FLASH PROGRAMMER",
>> -	[MHI_EE_DISABLE_TRANSITION] = "DISABLE",
>> -	[MHI_EE_NOT_SUPPORTED] = "NOT SUPPORTED",
>> +	MHI_EE_LIST
>>   };
>>   
>> +#undef dev_st_trans
>> +#undef dev_st_trans_end
>> +
>> +#define dev_st_trans(a, b)	[DEV_ST_TRANSITION_##a] = b,
>> +#define dev_st_trans_end(a, b)	[DEV_ST_TRANSITION_##a] = b,
>> +
>>   const char * const dev_state_tran_str[DEV_ST_TRANSITION_MAX] = {
>> -	[DEV_ST_TRANSITION_PBL] = "PBL",
>> -	[DEV_ST_TRANSITION_READY] = "READY",
>> -	[DEV_ST_TRANSITION_SBL] = "SBL",
>> -	[DEV_ST_TRANSITION_MISSION_MODE] = "MISSION MODE",
>> -	[DEV_ST_TRANSITION_FP] = "FLASH PROGRAMMER",
>> -	[DEV_ST_TRANSITION_SYS_ERR] = "SYS ERROR",
>> -	[DEV_ST_TRANSITION_DISABLE] = "DISABLE",
>> +	DEV_ST_TRANSITION_LIST
>>   };
>>   
>> +#undef ch_state_type
>> +#undef ch_state_type_end
>> +
>> +#define ch_state_type(a, b)	[MHI_CH_STATE_TYPE_##a] = b,
>> +#define ch_state_type_end(a, b)	[MHI_CH_STATE_TYPE_##a] = b,
>> +
>>   const char * const mhi_ch_state_type_str[MHI_CH_STATE_TYPE_MAX] = {
>> -	[MHI_CH_STATE_TYPE_RESET] = "RESET",
>> -	[MHI_CH_STATE_TYPE_STOP] = "STOP",
>> -	[MHI_CH_STATE_TYPE_START] = "START",
>> +	MHI_CH_STATE_TYPE_LIST
>>   };
>>   
>> +#undef mhi_pm_state
>> +#undef mhi_pm_state_end
>> +
>> +#define mhi_pm_state(a, b)	[MHI_PM_STATE_##a] = b,
>> +#define mhi_pm_state_end(a, b)	[MHI_PM_STATE_##a] = b,
>> +
>>   static const char * const mhi_pm_state_str[] = {
>> -	[MHI_PM_STATE_DISABLE] = "DISABLE",
>> -	[MHI_PM_STATE_POR] = "POWER ON RESET",
>> -	[MHI_PM_STATE_M0] = "M0",
>> -	[MHI_PM_STATE_M2] = "M2",
>> -	[MHI_PM_STATE_M3_ENTER] = "M?->M3",
>> -	[MHI_PM_STATE_M3] = "M3",
>> -	[MHI_PM_STATE_M3_EXIT] = "M3->M0",
>> -	[MHI_PM_STATE_FW_DL_ERR] = "Firmware Download Error",
>> -	[MHI_PM_STATE_SYS_ERR_DETECT] = "SYS ERROR Detect",
>> -	[MHI_PM_STATE_SYS_ERR_PROCESS] = "SYS ERROR Process",
>> -	[MHI_PM_STATE_SYS_ERR_FAIL] = "SYS ERROR Failure",
>> -	[MHI_PM_STATE_SHUTDOWN_PROCESS] = "SHUTDOWN Process",
>> -	[MHI_PM_STATE_LD_ERR_FATAL_DETECT] = "Linkdown or Error Fatal Detect",
>> +	MHI_PM_STATE_LIST
>>   };
>>   
>>   const char *to_mhi_pm_state_str(u32 state)
>> diff --git a/drivers/bus/mhi/host/internal.h b/drivers/bus/mhi/host/internal.h
>> index 4b6deea17bcd..091244cf17c6 100644
>> --- a/drivers/bus/mhi/host/internal.h
>> +++ b/drivers/bus/mhi/host/internal.h
>> @@ -42,6 +42,11 @@ enum mhi_ch_state_type {
>>   	MHI_CH_STATE_TYPE_MAX,
>>   };
>>   
>> +#define MHI_CH_STATE_TYPE_LIST				\
>> +	ch_state_type(RESET,		"RESET")	\
>> +	ch_state_type(STOP,		"STOP")		\
>> +	ch_state_type_end(START,	"START")
>> +
>>   extern const char * const mhi_ch_state_type_str[MHI_CH_STATE_TYPE_MAX];
>>   #define TO_CH_STATE_TYPE_STR(state) (((state) >= MHI_CH_STATE_TYPE_MAX) ? \
>>   				     "INVALID_STATE" : \
>> @@ -50,6 +55,18 @@ extern const char * const mhi_ch_state_type_str[MHI_CH_STATE_TYPE_MAX];
>>   #define MHI_INVALID_BRSTMODE(mode) (mode != MHI_DB_BRST_DISABLE && \
>>   				    mode != MHI_DB_BRST_ENABLE)
>>   
>> +#define MHI_EE_LIST						\
>> +	mhi_ee(PBL,			"PRIMARY BOOTLOADER")	\
>> +	mhi_ee(SBL,			"SECONDARY BOOTLOADER")	\
>> +	mhi_ee(AMSS,			"MISSION MODE")		\
>> +	mhi_ee(RDDM,			"RAMDUMP DOWNLOAD MODE")\
>> +	mhi_ee(WFW,			"WLAN FIRMWARE")	\
>> +	mhi_ee(PTHRU,			"PASS THROUGH")		\
>> +	mhi_ee(EDL,			"EMERGENCY DOWNLOAD")	\
>> +	mhi_ee(FP,			"FLASH PROGRAMMER")	\
>> +	mhi_ee(DISABLE_TRANSITION,	"DISABLE")		\
>> +	mhi_ee_end(NOT_SUPPORTED,	"NOT SUPPORTED")
>> +
>>   extern const char * const mhi_ee_str[MHI_EE_MAX];
>>   #define TO_MHI_EXEC_STR(ee) (((ee) >= MHI_EE_MAX) ? \
>>   			     "INVALID_EE" : mhi_ee_str[ee])
>> @@ -72,6 +89,15 @@ enum dev_st_transition {
>>   	DEV_ST_TRANSITION_MAX,
>>   };
>>   
>> +#define DEV_ST_TRANSITION_LIST					\
>> +	dev_st_trans(PBL,		"PBL")			\
>> +	dev_st_trans(READY,		"READY")		\
>> +	dev_st_trans(SBL,		"SBL")			\
>> +	dev_st_trans(MISSION_MODE,	"MISSION MODE")		\
>> +	dev_st_trans(FP,		"FLASH PROGRAMMER")	\
>> +	dev_st_trans(SYS_ERR,		"SYS ERROR")		\
>> +	dev_st_trans_end(DISABLE,	"DISABLE")
>> +
>>   extern const char * const dev_state_tran_str[DEV_ST_TRANSITION_MAX];
>>   #define TO_DEV_STATE_TRANS_STR(state) (((state) >= DEV_ST_TRANSITION_MAX) ? \
>>   				"INVALID_STATE" : dev_state_tran_str[state])
>> @@ -94,6 +120,21 @@ enum mhi_pm_state {
>>   	MHI_PM_STATE_MAX
>>   };
>>   
>> +#define MHI_PM_STATE_LIST							\
>> +	mhi_pm_state(DISABLE,			"DISABLE")			\
>> +	mhi_pm_state(POR,			"POWER ON RESET")		\
>> +	mhi_pm_state(M0,			"M0")				\
>> +	mhi_pm_state(M2,			"M2")				\
>> +	mhi_pm_state(M3_ENTER,			"M?->M3")			\
>> +	mhi_pm_state(M3,			"M3")				\
>> +	mhi_pm_state(M3_EXIT,			"M3->M0")			\
>> +	mhi_pm_state(FW_DL_ERR,			"Firmware Download Error")	\
>> +	mhi_pm_state(SYS_ERR_DETECT,		"SYS ERROR Detect")		\
>> +	mhi_pm_state(SYS_ERR_PROCESS,		"SYS ERROR Process")		\
>> +	mhi_pm_state(SYS_ERR_FAIL,		"SYS ERROR Failure")		\
>> +	mhi_pm_state(SHUTDOWN_PROCESS,		"SHUTDOWN Process")		\
>> +	mhi_pm_state_end(LD_ERR_FATAL_DETECT,	"Linkdown or Error Fatal Detect")
>> +
>>   #define MHI_PM_DISABLE					BIT(0)
>>   #define MHI_PM_POR					BIT(1)
>>   #define MHI_PM_M0					BIT(2)
>> diff --git a/drivers/bus/mhi/host/main.c b/drivers/bus/mhi/host/main.c
>> index abb561db9ae1..2d38f6005da6 100644
>> --- a/drivers/bus/mhi/host/main.c
>> +++ b/drivers/bus/mhi/host/main.c
>> @@ -15,6 +15,7 @@
>>   #include <linux/skbuff.h>
>>   #include <linux/slab.h>
>>   #include "internal.h"
>> +#include "trace.h"
>>   
>>   int __must_check mhi_read_reg(struct mhi_controller *mhi_cntrl,
>>   			      void __iomem *base, u32 offset, u32 *out)
>> @@ -493,11 +494,8 @@ irqreturn_t mhi_intvec_threaded_handler(int irq_number, void *priv)
>>   
>>   	state = mhi_get_mhi_state(mhi_cntrl);
>>   	ee = mhi_get_exec_env(mhi_cntrl);
>> -	dev_dbg(dev, "local ee: %s state: %s device ee: %s state: %s\n",
>> -		TO_MHI_EXEC_STR(mhi_cntrl->ee),
>> -		mhi_state_str(mhi_cntrl->dev_state),
>> -		TO_MHI_EXEC_STR(ee), mhi_state_str(state));
>>   
>> +	trace_mhi_intvec_states(mhi_cntrl, ee, state);
>>   	if (state == MHI_STATE_SYS_ERR) {
>>   		dev_dbg(dev, "System error detected\n");
>>   		pm_state = mhi_tryset_pm_state(mhi_cntrl,
>> @@ -838,6 +836,8 @@ int mhi_process_ctrl_ev_ring(struct mhi_controller *mhi_cntrl,
>>   	while (dev_rp != local_rp) {
>>   		enum mhi_pkt_type type = MHI_TRE_GET_EV_TYPE(local_rp);
>>   
>> +		trace_mhi_ctrl_event(mhi_cntrl, local_rp);
>> +
>>   		switch (type) {
>>   		case MHI_PKT_TYPE_BW_REQ_EVENT:
>>   		{
>> @@ -1003,6 +1003,8 @@ int mhi_process_data_event_ring(struct mhi_controller *mhi_cntrl,
>>   	while (dev_rp != local_rp && event_quota > 0) {
>>   		enum mhi_pkt_type type = MHI_TRE_GET_EV_TYPE(local_rp);
>>   
>> +		trace_mhi_data_event(mhi_cntrl, local_rp);
>> +
>>   		chan = MHI_TRE_GET_EV_CHID(local_rp);
>>   
>>   		WARN_ON(chan >= mhi_cntrl->max_chan);
>> @@ -1243,6 +1245,7 @@ int mhi_gen_tre(struct mhi_controller *mhi_cntrl, struct mhi_chan *mhi_chan,
>>   	mhi_tre->dword[0] = MHI_TRE_DATA_DWORD0(info->len);
>>   	mhi_tre->dword[1] = MHI_TRE_DATA_DWORD1(bei, eot, eob, chain);
>>   
>> +	trace_mhi_gen_tre(mhi_cntrl, mhi_chan, mhi_tre);
>>   	/* increment WP */
>>   	mhi_add_ring_element(mhi_cntrl, tre_ring);
>>   	mhi_add_ring_element(mhi_cntrl, buf_ring);
>> @@ -1337,9 +1340,7 @@ static int mhi_update_channel_state(struct mhi_controller *mhi_cntrl,
>>   	enum mhi_cmd_type cmd = MHI_CMD_NOP;
>>   	int ret;
>>   
>> -	dev_dbg(dev, "%d: Updating channel state to: %s\n", mhi_chan->chan,
>> -		TO_CH_STATE_TYPE_STR(to_state));
>> -
>> +	trace_mhi_channel_command_start(mhi_cntrl, mhi_chan, to_state, "Updating");
>>   	switch (to_state) {
>>   	case MHI_CH_STATE_TYPE_RESET:
>>   		write_lock_irq(&mhi_chan->lock);
>> @@ -1406,9 +1407,7 @@ static int mhi_update_channel_state(struct mhi_controller *mhi_cntrl,
>>   		write_unlock_irq(&mhi_chan->lock);
>>   	}
>>   
>> -	dev_dbg(dev, "%d: Channel state change to %s successful\n",
>> -		mhi_chan->chan, TO_CH_STATE_TYPE_STR(to_state));
>> -
>> +	trace_mhi_channel_command_end(mhi_cntrl, mhi_chan, to_state, "Updated");
>>   exit_channel_update:
>>   	mhi_cntrl->runtime_put(mhi_cntrl);
>>   	mhi_device_put(mhi_cntrl->mhi_dev);
>> diff --git a/drivers/bus/mhi/host/pm.c b/drivers/bus/mhi/host/pm.c
>> index d0d033ce9984..8b40d3f01acc 100644
>> --- a/drivers/bus/mhi/host/pm.c
>> +++ b/drivers/bus/mhi/host/pm.c
>> @@ -15,6 +15,7 @@
>>   #include <linux/slab.h>
>>   #include <linux/wait.h>
>>   #include "internal.h"
>> +#include "trace.h"
>>   
>>   /*
>>    * Not all MHI state transitions are synchronous. Transitions like Linkdown,
>> @@ -131,6 +132,7 @@ enum mhi_pm_state __must_check mhi_tryset_pm_state(struct mhi_controller *mhi_cn
>>   	if (unlikely(!(dev_state_transitions[index].to_states & state)))
>>   		return cur_state;
>>   
>> +	trace_mhi_tryset_pm_state(mhi_cntrl, state);
>>   	mhi_cntrl->pm_state = state;
>>   	return mhi_cntrl->pm_state;
>>   }
>> @@ -772,7 +774,6 @@ void mhi_pm_st_worker(struct work_struct *work)
>>   	struct mhi_controller *mhi_cntrl = container_of(work,
>>   							struct mhi_controller,
>>   							st_worker);
>> -	struct device *dev = &mhi_cntrl->mhi_dev->dev;
>>   
>>   	spin_lock_irq(&mhi_cntrl->transition_lock);
>>   	list_splice_tail_init(&mhi_cntrl->transition_list, &head);
>> @@ -780,8 +781,8 @@ void mhi_pm_st_worker(struct work_struct *work)
>>   
>>   	list_for_each_entry_safe(itr, tmp, &head, node) {
>>   		list_del(&itr->node);
>> -		dev_dbg(dev, "Handling state transition: %s\n",
>> -			TO_DEV_STATE_TRANS_STR(itr->state));
>> +
>> +		trace_mhi_pm_st_transition(mhi_cntrl, itr->state);
>>   
>>   		switch (itr->state) {
>>   		case DEV_ST_TRANSITION_PBL:
>> diff --git a/drivers/bus/mhi/host/trace.h b/drivers/bus/mhi/host/trace.h
>> new file mode 100644
>> index 000000000000..d12a98d44272
>> --- /dev/null
>> +++ b/drivers/bus/mhi/host/trace.h
>> @@ -0,0 +1,280 @@
>> +/* SPDX-License-Identifier: GPL-2.0-only */
>> +/*
>> + * Copyright (c) 2023 Qualcomm Innovation Center, Inc. All rights reserved.
>> + */
>> +
>> +#undef TRACE_SYSTEM
>> +#define TRACE_SYSTEM mhi_host
>> +
>> +#if !defined(_TRACE_EVENT_MHI_HOST_H) || defined(TRACE_HEADER_MULTI_READ)
>> +#define _TRACE_EVENT_MHI_HOST_H
>> +
>> +#include <linux/tracepoint.h>
>> +#include <linux/trace_seq.h>
>> +#include "../common.h"
>> +#include "internal.h"
>> +
>> +#undef mhi_state
>> +#undef mhi_state_end
>> +
>> +#define mhi_state(a, b)		TRACE_DEFINE_ENUM(MHI_STATE_##a);
>> +#define mhi_state_end(a, b)	TRACE_DEFINE_ENUM(MHI_STATE_##a);
>> +
>> +MHI_STATE_LIST
>> +
>> +#undef mhi_state
>> +#undef mhi_state_end
>> +
>> +#define mhi_state(a, b)		{ MHI_STATE_##a, b },
>> +#define mhi_state_end(a, b)	{ MHI_STATE_##a, b }
>> +
>> +#undef mhi_pm_state
>> +#undef mhi_pm_state_end
>> +
>> +#define mhi_pm_state(a, b)		TRACE_DEFINE_ENUM(MHI_PM_STATE_##a);
>> +#define mhi_pm_state_end(a, b)		TRACE_DEFINE_ENUM(MHI_PM_STATE_##a);
>> +
>> +MHI_PM_STATE_LIST
>> +
>> +#undef mhi_pm_state
>> +#undef mhi_pm_state_end
>> +
>> +#define mhi_pm_state(a, b)		{ MHI_PM_STATE_##a, b },
>> +#define mhi_pm_state_end(a, b)		{ MHI_PM_STATE_##a, b }
>> +
>> +#undef mhi_ee
>> +#undef mhi_ee_end
>> +
>> +#define mhi_ee(a, b)			TRACE_DEFINE_ENUM(MHI_EE_##a);
>> +#define mhi_ee_end(a, b)		TRACE_DEFINE_ENUM(MHI_EE_##a);
>> +
>> +MHI_EE_LIST
>> +
>> +#undef mhi_ee
>> +#undef mhi_ee_end
>> +
>> +#define mhi_ee(a, b)			{ MHI_EE_##a, b },
>> +#define mhi_ee_end(a, b)		{ MHI_EE_##a, b }
>> +
>> +#undef ch_state_type
>> +#undef ch_state_type_end
>> +
>> +#define ch_state_type(a, b)		TRACE_DEFINE_ENUM(MHI_CH_STATE_TYPE_##a);
>> +#define ch_state_type_end(a, b)		TRACE_DEFINE_ENUM(MHI_CH_STATE_TYPE_##a);
>> +
>> +MHI_CH_STATE_TYPE_LIST
>> +
>> +#undef ch_state_type
>> +#undef ch_state_type_end
>> +
>> +#define ch_state_type(a, b)		{ MHI_CH_STATE_TYPE_##a, b },
>> +#define ch_state_type_end(a, b)		{ MHI_CH_STATE_TYPE_##a, b }
>> +
>> +#undef dev_st_trans
>> +#undef dev_st_trans_end
>> +
>> +#define dev_st_trans(a, b)		TRACE_DEFINE_ENUM(DEV_ST_TRANSITION_##a);
>> +#define dev_st_trans_end(a, b)		TRACE_DEFINE_ENUM(DEV_ST_TRANSITION_##a);
>> +
>> +DEV_ST_TRANSITION_LIST
>> +
>> +#undef dev_st_trans
>> +#undef dev_st_trans_end
>> +
>> +#define dev_st_trans(a, b)		{ DEV_ST_TRANSITION_##a, b },
>> +#define dev_st_trans_end(a, b)		{ DEV_ST_TRANSITION_##a, b }
>> +
>> +TRACE_EVENT(mhi_gen_tre,
>> +
>> +	TP_PROTO(struct mhi_controller *mhi_cntrl, struct mhi_chan *mhi_chan,
>> +		 struct mhi_ring_element *mhi_tre),
>> +
>> +	TP_ARGS(mhi_cntrl, mhi_chan, mhi_tre),
>> +
>> +	TP_STRUCT__entry(
>> +		__string(name, mhi_cntrl->mhi_dev->name)
>> +		__field(int, ch_num)
>> +		__field(void *, wp)
>> +		__field(__le64, tre_ptr)
>> +		__field(__le32, dword0)
>> +		__field(__le32, dword1)
>> +	),
>> +
>> +	TP_fast_assign(
>> +		__assign_str(name, mhi_cntrl->mhi_dev->name);
>> +		__entry->ch_num = mhi_chan->chan;
>> +		__entry->wp = mhi_tre;
>> +		__entry->tre_ptr = mhi_tre->ptr;
>> +		__entry->dword0 = mhi_tre->dword[0];
>> +		__entry->dword1 = mhi_tre->dword[1];
>> +	),
>> +
>> +	TP_printk("%s: Chan: %d TRE: 0x%p TRE buf: 0x%llx DWORD0: 0x%08x DWORD1: 0x%08x\n",
>> +		  __get_str(name), __entry->ch_num, __entry->wp, __entry->tre_ptr,
>> +		  __entry->dword0, __entry->dword1)
>> +);
>> +
>> +TRACE_EVENT(mhi_intvec_states,
>> +
>> +	TP_PROTO(struct mhi_controller *mhi_cntrl, int dev_ee, int dev_state),
>> +
>> +	TP_ARGS(mhi_cntrl, dev_ee, dev_state),
>> +
>> +	TP_STRUCT__entry(
>> +		__string(name, mhi_cntrl->mhi_dev->name)
>> +		__field(int, local_ee)
>> +		__field(int, state)
>> +		__field(int, dev_ee)
>> +		__field(int, dev_state)
>> +	),
>> +
>> +	TP_fast_assign(
>> +		__assign_str(name, mhi_cntrl->mhi_dev->name);
>> +		__entry->local_ee = mhi_cntrl->ee;
>> +		__entry->state = mhi_cntrl->dev_state;
>> +		__entry->dev_ee = dev_ee;
>> +		__entry->dev_state = dev_state;
>> +	),
>> +
>> +	TP_printk("%s: Local EE: %s State: %s Device EE: %s Dev State: %s\n",
>> +		  __get_str(name),
>> +		  __print_symbolic(__entry->local_ee, MHI_EE_LIST),
>> +		  __print_symbolic(__entry->state, MHI_STATE_LIST),
>> +		  __print_symbolic(__entry->dev_ee, MHI_EE_LIST),
>> +		  __print_symbolic(__entry->dev_state, MHI_STATE_LIST))
>> +);
>> +
>> +TRACE_EVENT(mhi_tryset_pm_state,
>> +
>> +	TP_PROTO(struct mhi_controller *mhi_cntrl, int pm_state),
>> +
>> +	TP_ARGS(mhi_cntrl, pm_state),
>> +
>> +	TP_STRUCT__entry(
>> +		__string(name, mhi_cntrl->mhi_dev->name)
>> +		__field(int, pm_state)
>> +	),
>> +
>> +	TP_fast_assign(
>> +		__assign_str(name, mhi_cntrl->mhi_dev->name);
>> +		if (pm_state)
>> +			pm_state = __fls(pm_state);
>> +		__entry->pm_state = pm_state;
>> +	),
>> +
>> +	TP_printk("%s: PM state: %s\n", __get_str(name),
>> +		  __print_symbolic(__entry->pm_state, MHI_PM_STATE_LIST))
>> +);
>> +
>> +DECLARE_EVENT_CLASS(mhi_process_event_ring,
>> +
>> +	TP_PROTO(struct mhi_controller *mhi_cntrl, struct mhi_ring_element *rp),
>> +
>> +	TP_ARGS(mhi_cntrl, rp),
>> +
>> +	TP_STRUCT__entry(
>> +		__string(name, mhi_cntrl->mhi_dev->name)
>> +		__field(__le32, dword0)
>> +		__field(__le32, dword1)
>> +		__field(int, state)
>> +		__field(__le64, ptr)
>> +		__field(void *, rp)
>> +	),
>> +
>> +	TP_fast_assign(
>> +		__assign_str(name, mhi_cntrl->mhi_dev->name);
>> +		__entry->rp = rp;
>> +		__entry->ptr = rp->ptr;
>> +		__entry->dword0 = rp->dword[0];
>> +		__entry->dword1 = rp->dword[1];
>> +		__entry->state = MHI_TRE_GET_EV_STATE(rp);
>> +	),
>> +
>> +	TP_printk("%s: TRE: 0x%p TRE buf: 0x%llx DWORD0: 0x%08x DWORD1: 0x%08x State: %s\n",
>> +		  __get_str(name), __entry->rp, __entry->ptr, __entry->dword0,
>> +		  __entry->dword1, __print_symbolic(__entry->state, MHI_STATE_LIST))
>> +);
>> +
>> +DEFINE_EVENT(mhi_process_event_ring, mhi_data_event,
>> +
>> +	TP_PROTO(struct mhi_controller *mhi_cntrl, struct mhi_ring_element *rp),
>> +
>> +	TP_ARGS(mhi_cntrl, rp)
>> +);
>> +
>> +DEFINE_EVENT(mhi_process_event_ring, mhi_ctrl_event,
>> +
>> +	TP_PROTO(struct mhi_controller *mhi_cntrl, struct mhi_ring_element *rp),
>> +
>> +	TP_ARGS(mhi_cntrl, rp)
>> +);
>> +
>> +DECLARE_EVENT_CLASS(mhi_update_channel_state,
>> +
>> +	TP_PROTO(struct mhi_controller *mhi_cntrl, struct mhi_chan *mhi_chan, int state,
>> +		 const char *reason),
>> +
>> +	TP_ARGS(mhi_cntrl, mhi_chan, state, reason),
>> +
>> +	TP_STRUCT__entry(
>> +		__string(name, mhi_cntrl->mhi_dev->name)
>> +		__field(int, ch_num)
>> +		__field(int, state)
>> +		__field(const char *, reason)
>> +	),
>> +
>> +	TP_fast_assign(
>> +		__assign_str(name, mhi_cntrl->mhi_dev->name);
>> +		__entry->ch_num = mhi_chan->chan;
>> +		__entry->state = state;
>> +		__entry->reason = reason;
>> +	),
>> +
>> +	TP_printk("%s: chan%d: %s state to: %s\n",
>> +		  __get_str(name),  __entry->ch_num, __entry->reason,
>> +		  __print_symbolic(__entry->state, MHI_CH_STATE_TYPE_LIST))
>> +);
>> +
>> +DEFINE_EVENT(mhi_update_channel_state, mhi_channel_command_start,
>> +
>> +	TP_PROTO(struct mhi_controller *mhi_cntrl, struct mhi_chan *mhi_chan, int state,
>> +		 const char *reason),
>> +
>> +	TP_ARGS(mhi_cntrl, mhi_chan, state, reason)
>> +);
>> +
>> +DEFINE_EVENT(mhi_update_channel_state, mhi_channel_command_end,
>> +
>> +	TP_PROTO(struct mhi_controller *mhi_cntrl, struct mhi_chan *mhi_chan, int state,
>> +		 const char *reason),
>> +
>> +	TP_ARGS(mhi_cntrl, mhi_chan, state, reason)
>> +);
>> +
>> +TRACE_EVENT(mhi_pm_st_transition,
>> +
>> +	TP_PROTO(struct mhi_controller *mhi_cntrl, int state),
>> +
>> +	TP_ARGS(mhi_cntrl, state),
>> +
>> +	TP_STRUCT__entry(
>> +		__string(name, mhi_cntrl->mhi_dev->name)
>> +		__field(int, state)
>> +	),
>> +
>> +	TP_fast_assign(
>> +		__assign_str(name, mhi_cntrl->mhi_dev->name);
>> +		__entry->state = state;
>> +	),
>> +
>> +	TP_printk("%s: Handling state transition: %s\n", __get_str(name),
>> +		  __print_symbolic(__entry->state, DEV_ST_TRANSITION_LIST))
>> +);
>> +
>> +#endif
>> +#undef TRACE_INCLUDE_PATH
>> +#define TRACE_INCLUDE_PATH ../../drivers/bus/mhi/host
>> +#undef TRACE_INCLUDE_FILE
>> +#define TRACE_INCLUDE_FILE trace
>> +
>> +#include <trace/define_trace.h>
>>
>> ---
>> base-commit: ae1d892d518af5c092f2b1f8e6921996c6a95cb3
>> change-id: 20240206-ftrace_support-8ef0fbecf85e
>>
>> Best regards,
>> -- 
>> Krishna chaitanya chundru <quic_krichai@quicinc.com>
>>
>