platform/surface: aggregator: Add trace points

Add trace points to the Surface Aggregator subsystem core. These trace
points can be used to track packets, requests, and allocations. They are
further intended for debugging and testing/validation, specifically in
combination with the error injection capabilities introduced in the
subsequent commit.

Signed-off-by: Maximilian Luz <luzmaximilian@gmail.com>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Link: https://lore.kernel.org/r/20201221183959.1186143-5-luzmaximilian@gmail.com
Signed-off-by: Hans de Goede <hdegoede@redhat.com>

1 files changed, 18 insertions, 0 deletions

diff --git a/drivers/platform/surface/aggregator/ssh_request_layer.c b/drivers/platform/surface/aggregator/ssh_request_layer.c
index 66c839a995f3..b649d71840fd 100644
--- a/drivers/platform/surface/aggregator/ssh_request_layer.c
+++ b/drivers/platform/surface/aggregator/ssh_request_layer.c
@@ -22,6 +22,8 @@
 #include "ssh_packet_layer.h"
 #include "ssh_request_layer.h"
 
+#include "trace.h"
+
 /*
  * SSH_RTL_REQUEST_TIMEOUT - Request timeout.
  *
@@ -144,6 +146,8 @@ static void ssh_rtl_complete_with_status(struct ssh_request *rqst, int status)
 {
 	struct ssh_rtl *rtl = ssh_request_rtl(rqst);
 
+	trace_ssam_request_complete(rqst, status);
+
 	/* rtl/ptl may not be set if we're canceling before submitting. */
 	rtl_dbg_cond(rtl, "rtl: completing request (rqid: %#06x, status: %d)\n",
 		     ssh_request_get_rqid_safe(rqst), status);
@@ -157,6 +161,8 @@ static void ssh_rtl_complete_with_rsp(struct ssh_request *rqst,
 {
 	struct ssh_rtl *rtl = ssh_request_rtl(rqst);
 
+	trace_ssam_request_complete(rqst, 0);
+
 	rtl_dbg(rtl, "rtl: completing request with response (rqid: %#06x)\n",
 		ssh_request_get_rqid(rqst));
 
@@ -329,6 +335,8 @@ static void ssh_rtl_tx_work_fn(struct work_struct *work)
  */
 int ssh_rtl_submit(struct ssh_rtl *rtl, struct ssh_request *rqst)
 {
+	trace_ssam_request_submit(rqst);
+
 	/*
 	 * Ensure that requests expecting a response are sequenced. If this
 	 * invariant ever changes, see the comment in ssh_rtl_complete() on what
@@ -439,6 +447,8 @@ static void ssh_rtl_complete(struct ssh_rtl *rtl,
 	struct ssh_request *p, *n;
 	u16 rqid = get_unaligned_le16(&command->rqid);
 
+	trace_ssam_rx_response_received(command, command_data->len);
+
 	/*
 	 * Get request from pending based on request ID and mark it as response
 	 * received and locked.
@@ -688,6 +698,8 @@ bool ssh_rtl_cancel(struct ssh_request *rqst, bool pending)
 	if (test_and_set_bit(SSH_REQUEST_SF_CANCELED_BIT, &rqst->state))
 		return true;
 
+	trace_ssam_request_cancel(rqst);
+
 	if (pending)
 		canceled = ssh_rtl_cancel_pending(rqst);
 	else
@@ -779,6 +791,8 @@ static void ssh_rtl_timeout_reap(struct work_struct *work)
 	ktime_t timeout = rtl->rtx_timeout.timeout;
 	ktime_t next = KTIME_MAX;
 
+	trace_ssam_rtl_timeout_reap(atomic_read(&rtl->pending.count));
+
 	/*
 	 * Mark reaper as "not pending". This is done before checking any
 	 * requests to avoid lost-update type problems.
@@ -822,6 +836,8 @@ static void ssh_rtl_timeout_reap(struct work_struct *work)
 
 	/* Cancel and complete the request. */
 	list_for_each_entry_safe(r, n, &claimed, node) {
+		trace_ssam_request_timeout(r);
+
 		/*
 		 * At this point we've removed the packet from pending. This
 		 * means that we've obtained the last (only) reference of the
@@ -849,6 +865,8 @@ static void ssh_rtl_timeout_reap(struct work_struct *work)
 static void ssh_rtl_rx_event(struct ssh_rtl *rtl, const struct ssh_command *cmd,
 			     const struct ssam_span *data)
 {
+	trace_ssam_rx_event_received(cmd, data->len);
+
 	rtl_dbg(rtl, "rtl: handling event (rqid: %#06x)\n",
 		get_unaligned_le16(&cmd->rqid));