Add a set of tracepoints for reporting MHI events such as
MHI transfers, events, doorbell, etc...
This can be used for debugging purpose.
Signed-off-by: Loic Poulain <loic.poulain@xxxxxxxxxx>
---
drivers/bus/mhi/core/main.c | 12 +++++
include/trace/events/mhi.h | 121 ++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 133 insertions(+)
create mode 100644 include/trace/events/mhi.h
diff --git a/drivers/bus/mhi/core/main.c b/drivers/bus/mhi/core/main.c
index c1eb43d..312e4db 100644
--- a/drivers/bus/mhi/core/main.c
+++ b/drivers/bus/mhi/core/main.c
@@ -15,6 +15,9 @@
#include <linux/slab.h>
#include "internal.h"
+#define CREATE_TRACE_POINTS
+#include <trace/events/mhi.h>
+
int __must_check mhi_read_reg(struct mhi_controller *mhi_cntrl,
void __iomem *base, u32 offset, u32 *out)
{
@@ -61,6 +64,8 @@ void mhi_write_reg_field(struct mhi_controller *mhi_cntrl, void __iomem *base,
void mhi_write_db(struct mhi_controller *mhi_cntrl, void __iomem *db_addr,
dma_addr_t db_val)
{
+ trace_mhi_ring_doorbell(db_addr, db_val, mhi_cntrl);
+
mhi_write_reg(mhi_cntrl, db_addr, 4, upper_32_bits(db_val));
mhi_write_reg(mhi_cntrl, db_addr, 0, lower_32_bits(db_val));
}
@@ -118,6 +123,7 @@ void mhi_ring_chan_db(struct mhi_controller *mhi_cntrl,
*/
dma_wmb();
*ring->ctxt_wp = db;
+ trace_mhi_update_ring_wp(ring, mhi_cntrl);
mhi_chan->db_cfg.process_db(mhi_cntrl, &mhi_chan->db_cfg,
ring->db_addr, db);
@@ -724,6 +730,8 @@ 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_event(local_rp, mhi_cntrl);
+
switch (type) {
case MHI_PKT_TYPE_BW_REQ_EVENT:
{
@@ -872,6 +880,8 @@ int mhi_process_data_event_ring(struct mhi_controller *mhi_cntrl,
WARN_ON(chan >= mhi_cntrl->max_chan);
+ trace_mhi_event(local_rp, mhi_cntrl);
+
/*
* Only process the event ring elements whose channel
* ID is within the maximum supported range.
@@ -1098,6 +1108,8 @@ int mhi_gen_tre(struct mhi_controller *mhi_cntrl, struct mhi_chan *mhi_chan,
mhi_add_ring_element(mhi_cntrl, tre_ring);
mhi_add_ring_element(mhi_cntrl, buf_ring);
+ trace_mhi_transfer(mhi_tre, mhi_cntrl, mhi_chan->chan);
+
return 0;
}
diff --git a/include/trace/events/mhi.h b/include/trace/events/mhi.h
new file mode 100644
index 0000000..903fdd4
--- /dev/null
+++ b/include/trace/events/mhi.h
@@ -0,0 +1,121 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM mhi
+
+#if !defined(_TRACE_MHI_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _TRACE_MHI_H
+
+#include <linux/mhi.h>
+#include <linux/tracepoint.h>
+
+#include "../../drivers/bus/mhi/core/internal.h"
+
+TRACE_EVENT(mhi_transfer,
+
+ TP_PROTO(struct mhi_tre *tre, struct mhi_controller *cntrl, u32 chan),
+
+ TP_ARGS(tre, cntrl, chan),
+
+ TP_STRUCT__entry(
+ __field(int, cntrl_index)
+ __field(u32, channel)
+ __field(void *, treaddr)
+ __field(u64, treptr)
+ __field(u32, tredword0)
+ __field(u32, tredword1)
+ ),
+
+ TP_fast_assign(
+ __entry->cntrl_index = cntrl->index;
+ __entry->channel = chan;
+ __entry->treaddr = tre;
+ __entry->treptr = tre->ptr;
+ __entry->tredword0 = tre->dword[0];
+ __entry->tredword1 = tre->dword[1];
+ ),
+
+ TP_printk("mhi%d.%u treaddr=%p treptr=%llx tredword0=%08x tredword1=%08x",
+ __entry->cntrl_index, __entry->channel, __entry->treaddr,
+ __entry->treptr, __entry->tredword0, __entry->tredword1)
+);
+
+TRACE_EVENT(mhi_update_ring_wp,
+
+ TP_PROTO(struct mhi_ring *ring, struct mhi_controller *cntrl),
+
+ TP_ARGS(ring, cntrl),
+
+ TP_STRUCT__entry(
+ __field(int, cntrl_index)
+ __field(void *, ring)
+ __field(void *, wp_host)
+ __field(u64, wp_device)
+ ),
+
+ TP_fast_assign(
+ __entry->cntrl_index = cntrl->index;
+ __entry->ring = ring;
+ __entry->wp_host = ring->wp;
+ __entry->wp_device = *ring->ctxt_wp;
+ ),
+
+ TP_printk("mhi%d ringaddr=%p wp_host=%p wp_device=%llx",
+ __entry->cntrl_index, __entry->ring, __entry->wp_host,
+ __entry->wp_device)
+);
+
+TRACE_EVENT(mhi_ring_doorbell,
+
+ TP_PROTO(void __iomem *db_addr, dma_addr_t db_val, struct mhi_controller *cntrl),
+
+ TP_ARGS(db_addr, db_val, cntrl),
+
+ TP_STRUCT__entry(
+ __field(int, cntrl_index)
+ __field(void *, dbaddr)
+ __field(dma_addr_t, dbval)
+ ),
+
+ TP_fast_assign(
+ __entry->cntrl_index = cntrl->index;
+ __entry->dbaddr = db_addr;
+ __entry->dbval = db_val;
+ ),
+
+ TP_printk("mhi%d dbaddr=%p dbval=%llx", __entry->cntrl_index,
+ __entry->dbaddr, __entry->dbval)
+);
+
+TRACE_EVENT(mhi_event,
+
+ TP_PROTO(struct mhi_tre *tre, struct mhi_controller *cntrl),
+
+ TP_ARGS(tre, cntrl),
+
+ TP_STRUCT__entry(
+ __field(int, cntrl_index)
+ __field(u32, channel)
+ __field(unsigned int, type)
+ __field(u64, treptr)
+ __field(u32, tredword0)
+ __field(u32, tredword1)
+ ),
+
+ TP_fast_assign(
+ __entry->cntrl_index = cntrl->index;
+ __entry->channel = MHI_TRE_GET_EV_CHID(tre);
+ __entry->type = MHI_TRE_GET_EV_TYPE(tre);
+ __entry->treptr = tre->ptr;
+ __entry->tredword0 = tre->dword[0];
+ __entry->tredword1 = tre->dword[1];
+ ),
+
+ TP_printk("mhi%d.%u type=%u treptr=%llx tredword0=%08x tredword1=%08x",
+ __entry->cntrl_index, __entry->channel, __entry->type,
+ __entry->treptr, __entry->tredword0, __entry->tredword1)
+);
+
+#endif /* _TRACE_MHI_H */
+
+/* This part must be outside protection */
+#include <trace/define_trace.h>
--
2.7.4
