Messages in this thread | ![/](/images/icornerl.gif) | | Date | Tue, 12 Dec 2023 12:56:57 +0530 | Subject | Re: [PATCH v8] bus: mhi: host: Add tracing support | From | Krishna Chaitanya Chundru <> |
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Hi Steven,
Can you review it once.
Thanks & Regards,
Krishna Chaitanya.
On 12/7/2023 10:00 AM, 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 > > Where ever the trace events are added, debug messages are removed. > > Signed-off-by: Krishna chaitanya chundru <quic_krichai@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/host/init.c | 3 + > drivers/bus/mhi/host/main.c | 19 ++-- > drivers/bus/mhi/host/pm.c | 7 +- > drivers/bus/mhi/host/trace.h | 205 +++++++++++++++++++++++++++++++++++++++++++ > 4 files changed, 221 insertions(+), 13 deletions(-) > > diff --git a/drivers/bus/mhi/host/init.c b/drivers/bus/mhi/host/init.c > index f78aefd2d7a3..6acb85f4c5f8 100644 > --- a/drivers/bus/mhi/host/init.c > +++ b/drivers/bus/mhi/host/init.c > @@ -20,6 +20,9 @@ > #include <linux/wait.h> > #include "internal.h" > > +#define CREATE_TRACE_POINTS > +#include "trace.h" > + > static DEFINE_IDA(mhi_controller_ida); > > const char * const mhi_ee_str[MHI_EE_MAX] = { > diff --git a/drivers/bus/mhi/host/main.c b/drivers/bus/mhi/host/main.c > index dcf627b36e82..189f4786403e 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) > @@ -491,11 +492,8 @@ 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, > @@ -832,6 +830,8 @@ 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: > { > @@ -997,6 +997,8 @@ 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); > @@ -1235,6 +1237,7 @@ 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); > @@ -1327,9 +1330,7 @@ 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); > switch (to_state) { > case MHI_CH_STATE_TYPE_RESET: > write_lock_irq(&mhi_chan->lock); > @@ -1396,9 +1397,7 @@ 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); > 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 8a4362d75fc4..5a2394b5b2e1 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, > @@ -123,6 +124,7 @@ 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; > } > @@ -753,7 +755,6 @@ 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); > @@ -761,8 +762,8 @@ 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..73c129bb91d9 > --- /dev/null > +++ b/drivers/bus/mhi/host/trace.h > @@ -0,0 +1,205 @@ > +/* 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" > + > +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 state: %s\n", > + __get_str(name), > + TO_MHI_EXEC_STR(__entry->local_ee), > + mhi_state_str(__entry->state), > + TO_MHI_EXEC_STR(__entry->dev_ee), > + mhi_state_str(__entry->dev_state)) > +); > + > +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), > + to_mhi_pm_state_str(__entry->pm_state)) > +); > + > +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, mhi_state_str(__entry->state)) > +); > + > +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), > + > + TP_ARGS(mhi_cntrl, mhi_chan, state), > + > + TP_STRUCT__entry( > + __string(name, mhi_cntrl->mhi_dev->name) > + __field(int, ch_num) > + __field(int, state) > + ), > + > + TP_fast_assign( > + __assign_str(name, mhi_cntrl->mhi_dev->name); > + __entry->ch_num = mhi_chan->chan; > + __entry->state = state; > + ), > + > + TP_printk("%s: chan%d: Updating state to: %s\n", > + __get_str(name), __entry->ch_num, > + TO_CH_STATE_TYPE_STR(__entry->state)) > +); > + > +DEFINE_EVENT(mhi_update_channel_state, mhi_channel_command_start, > + > + TP_PROTO(struct mhi_controller *mhi_cntrl, struct mhi_chan *mhi_chan, int state), > + > + TP_ARGS(mhi_cntrl, mhi_chan, state) > +); > + > +DEFINE_EVENT(mhi_update_channel_state, mhi_channel_command_end, > + > + TP_PROTO(struct mhi_controller *mhi_cntrl, struct mhi_chan *mhi_chan, int state), > + > + TP_ARGS(mhi_cntrl, mhi_chan, state) > +); > + > +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), > + TO_DEV_STATE_TRANS_STR(__entry->state)) > +); > + > +#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: 3006adf3be79cde4d14b1800b963b82b6e5572e0 > change-id: 20231005-ftrace_support-6869d4156139 > > Best regards,
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