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mhi: core: Add OOB and DB mode event IPC log and count

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Add IPC verbose log to print OOB and DB mode event and
the door bell ring status. Include the DB ring status
in data channel queue API. Add OOB/DB mode counter.
This helps to identify how long MHI host took to ring
the doorbell and how many times these events are getting
triggered. Reset mode_change count in debugfs show API
in order to track this for a given use case.

Change-Id: I2215554bff6d66098a8c7d01f587c1d726443181
Signed-off-by: Hemant Kumar <hemantk@codeaurora.org>
This commit is contained in:
Hemant Kumar 2020-01-04 19:56:11 -08:00 • committed by Gerrit - the friendly Code Review server
commit d8c5bb77e0
2 changed files with 30 additions and 15 deletions
Download patch file Download diff file Expand all files Collapse all files

3
drivers/bus/mhi/core/mhi_internal.h
View file

@ -697,6 +697,9 @@ struct mhi_chan {
struct completion completion;
rwlock_t lock;
struct list_head node;
/* stats */
u64 mode_change;
};
struct tsync_node {

42
drivers/bus/mhi/core/mhi_main.c
View file

@ -558,9 +558,9 @@ int mhi_queue_dma(struct mhi_device *mhi_dev,
mhi_tre->dword[1] = MHI_TRE_DATA_DWORD1(mhi_chan->bei, 1, 0, 0);
}
MHI_VERB("chan:%d WP:0x%llx TRE:0x%llx 0x%08x 0x%08x\n", mhi_chan->chan,
(u64)mhi_to_physical(tre_ring, mhi_tre), mhi_tre->ptr,
mhi_tre->dword[0], mhi_tre->dword[1]);
MHI_VERB("chan:%d WP:0x%llx TRE:0x%llx 0x%08x 0x%08x rDB %d\n",
mhi_chan->chan, (u64)mhi_to_physical(tre_ring, mhi_tre),
mhi_tre->ptr, mhi_tre->dword[0], mhi_tre->dword[1], ring_db);
/* increment WP */
mhi_add_ring_element(mhi_cntrl, tre_ring);
@ -988,6 +988,7 @@ static int parse_xfer_event(struct mhi_controller *mhi_cntrl,
unsigned long flags = 0;
bool ring_db = true;
int n_free_tre, n_queued_tre;
unsigned long rflags;
ev_code = MHI_TRE_GET_EV_CODE(event);
buf_ring = &mhi_chan->buf_ring;
@ -1077,12 +1078,8 @@ static int parse_xfer_event(struct mhi_controller *mhi_cntrl,
break;
} /* CC_EOT */
case MHI_EV_CC_OOB:
case MHI_EV_CC_DB_MODE:
{
unsigned long flags;
MHI_VERB("DB_MODE/OOB Detected chan %d.\n", mhi_chan->chan);
mhi_chan->db_cfg.db_mode = true;
mhi_chan->mode_change++;
/*
* on RSC channel IPA HW has a minimum credit requirement before
@ -1096,14 +1093,27 @@ static int parse_xfer_event(struct mhi_controller *mhi_cntrl,
ring_db = false;
}
read_lock_irqsave(&mhi_cntrl->pm_lock, flags);
MHI_VERB("OOB_MODE chan %d ring_db %d\n", mhi_chan->chan,
ring_db);
read_lock_irqsave(&mhi_cntrl->pm_lock, rflags);
if (tre_ring->wp != tre_ring->rp &&
MHI_DB_ACCESS_VALID(mhi_cntrl) && ring_db) {
MHI_DB_ACCESS_VALID(mhi_cntrl) && ring_db)
mhi_ring_chan_db(mhi_cntrl, mhi_chan);
}
read_unlock_irqrestore(&mhi_cntrl->pm_lock, flags);
read_unlock_irqrestore(&mhi_cntrl->pm_lock, rflags);
break;
case MHI_EV_CC_DB_MODE:
MHI_VERB("DB_MODE chan %d.\n", mhi_chan->chan);
mhi_chan->db_cfg.db_mode = true;
mhi_chan->mode_change++;
read_lock_irqsave(&mhi_cntrl->pm_lock, rflags);
if (tre_ring->wp != tre_ring->rp &&
MHI_DB_ACCESS_VALID(mhi_cntrl))
mhi_ring_chan_db(mhi_cntrl, mhi_chan);
read_unlock_irqrestore(&mhi_cntrl->pm_lock, rflags);
break;
}
case MHI_EV_CC_BAD_TRE:
MHI_ASSERT(1, "Received BAD TRE event for ring");
break;
@ -2205,12 +2215,14 @@ int mhi_debugfs_mhi_chan_show(struct seq_file *m, void *d)
chan_ctxt->pollcfg, chan_ctxt->chtype,
chan_ctxt->erindex);
seq_printf(m,
" base:0x%llx len:0x%llx wp:0x%llx local_rp:0x%llx local_wp:0x%llx db:0x%llx\n",
" base:0x%llx len:0x%llx wp:0x%llx local_rp:0x%llx local_wp:0x%llx db:0x%llx mode_change:0x%llx\n",
chan_ctxt->rbase, chan_ctxt->rlen,
chan_ctxt->wp,
mhi_to_physical(ring, ring->rp),
mhi_to_physical(ring, ring->wp),
mhi_chan->db_cfg.db_val);
mhi_chan->db_cfg.db_val,
mhi_chan->mode_change);
mhi_chan->mode_change = 0;
}
}