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Message-ID: <20240605235155.116468-12-o-takashi@sakamocchi.jp>
Date: Thu, 6 Jun 2024 08:51:55 +0900
From: Takashi Sakamoto <o-takashi@...amocchi.jp>
To: linux1394-devel@...ts.sourceforge.net
Cc: linux-kernel@...r.kernel.org
Subject: [PATCH 11/11] firewire: core: add tracepoints event for self_id_sequence
It is helpful to trace the content of self ID sequence when the core
function building bus topology.
This commit adds a tracepoints event fot the purpose. It seems not to
achieve printing variable length of array in print time without any
storage, thus the structure of event includes a superfluous array to store
the state of port. Additionally, there is no helper function to print
symbol array, thus the state of port is printed as raw value.
Signed-off-by: Takashi Sakamoto <o-takashi@...amocchi.jp>
---
drivers/firewire/core-topology.c | 7 ++--
drivers/firewire/core-trace.c | 15 ++++++++
include/trace/events/firewire.h | 59 ++++++++++++++++++++++++++++++++
3 files changed, 79 insertions(+), 2 deletions(-)
diff --git a/drivers/firewire/core-topology.c b/drivers/firewire/core-topology.c
index 6ec100e17500..4a0b273392ab 100644
--- a/drivers/firewire/core-topology.c
+++ b/drivers/firewire/core-topology.c
@@ -95,7 +95,8 @@ static inline struct fw_node *fw_node(struct list_head *l)
* internally consistent. On success this function returns the
* fw_node corresponding to the local card otherwise NULL.
*/
-static struct fw_node *build_tree(struct fw_card *card, const u32 *sid, int self_id_count)
+static struct fw_node *build_tree(struct fw_card *card, const u32 *sid, int self_id_count,
+ unsigned int generation)
{
struct self_id_sequence_enumerator enumerator = {
.cursor = sid,
@@ -139,6 +140,8 @@ static struct fw_node *build_tree(struct fw_card *card, const u32 *sid, int self
}
port_capacity = self_id_sequence_get_port_capacity(quadlet_count);
+ trace_self_id_sequence(self_id_sequence, quadlet_count, generation);
+
for (port_index = 0; port_index < port_capacity; ++port_index) {
port_status = self_id_sequence_get_port_status(self_id_sequence, quadlet_count,
port_index);
@@ -482,7 +485,7 @@ void fw_core_handle_bus_reset(struct fw_card *card, int node_id, int generation,
card->bm_abdicate = bm_abdicate;
fw_schedule_bm_work(card, 0);
- local_node = build_tree(card, self_ids, self_id_count);
+ local_node = build_tree(card, self_ids, self_id_count, generation);
update_topology_map(card, self_ids, self_id_count);
diff --git a/drivers/firewire/core-trace.c b/drivers/firewire/core-trace.c
index 7cbf850f3719..c9bc4990d66e 100644
--- a/drivers/firewire/core-trace.c
+++ b/drivers/firewire/core-trace.c
@@ -2,7 +2,22 @@
// Copyright (c) 2024 Takashi Sakamoto
#include <linux/types.h>
+#include <linux/err.h>
#include "packet-header-definitions.h"
+#include "phy-packet-definitions.h"
#define CREATE_TRACE_POINTS
#include <trace/events/firewire.h>
+
+#ifdef TRACEPOINTS_ENABLED
+void copy_port_status(u8 *port_status, unsigned int port_capacity,
+ const u32 *self_id_sequence, unsigned int quadlet_count)
+{
+ unsigned int port_index;
+
+ for (port_index = 0; port_index < port_capacity; ++port_index) {
+ port_status[port_index] =
+ self_id_sequence_get_port_status(self_id_sequence, quadlet_count, port_index);
+ }
+}
+#endif
diff --git a/include/trace/events/firewire.h b/include/trace/events/firewire.h
index 1f4ef0ed65bc..4761b700ff84 100644
--- a/include/trace/events/firewire.h
+++ b/include/trace/events/firewire.h
@@ -341,6 +341,65 @@ TRACE_EVENT(bus_reset_handle,
)
);
+// Some macros are defined in 'drivers/firewire/phy-packet-definitions.h'.
+
+// The content of TP_printk field is preprocessed, then put to the module binary.
+
+#define PHY_PACKET_SELF_ID_GET_PHY_ID(quads) \
+ ((((const u32 *)quads)[0] & SELF_ID_PHY_ID_MASK) >> SELF_ID_PHY_ID_SHIFT)
+
+#define PHY_PACKET_SELF_ID_GET_LINK_ACTIVE(quads) \
+ ((((const u32 *)quads)[0] & SELF_ID_ZERO_LINK_ACTIVE_MASK) >> SELF_ID_ZERO_LINK_ACTIVE_SHIFT)
+
+#define PHY_PACKET_SELF_ID_GET_GAP_COUNT(quads) \
+ ((((const u32 *)quads)[0] & SELF_ID_ZERO_GAP_COUNT_MASK) >> SELF_ID_ZERO_GAP_COUNT_SHIFT)
+
+#define PHY_PACKET_SELF_ID_GET_SCODE(quads) \
+ ((((const u32 *)quads)[0] & SELF_ID_ZERO_SCODE_MASK) >> SELF_ID_ZERO_SCODE_SHIFT)
+
+#define PHY_PACKET_SELF_ID_GET_CONTENDER(quads) \
+ ((((const u32 *)quads)[0] & SELF_ID_ZERO_CONTENDER_MASK) >> SELF_ID_ZERO_CONTENDER_SHIFT)
+
+#define PHY_PACKET_SELF_ID_GET_POWER_CLASS(quads) \
+ ((((const u32 *)quads)[0] & SELF_ID_ZERO_POWER_CLASS_MASK) >> SELF_ID_ZERO_POWER_CLASS_SHIFT)
+
+#define PHY_PACKET_SELF_ID_GET_INITIATED_RESET(quads) \
+ ((((const u32 *)quads)[0] & SELF_ID_ZERO_INITIATED_RESET_MASK) >> SELF_ID_ZERO_INITIATED_RESET_SHIFT)
+
+void copy_port_status(u8 *port_status, unsigned int port_capacity, const u32 *self_id_sequence,
+ unsigned int quadlet_count);
+
+TRACE_EVENT(self_id_sequence,
+ TP_PROTO(const u32 *self_id_sequence, unsigned int quadlet_count, unsigned int generation),
+ TP_ARGS(self_id_sequence, quadlet_count, generation),
+ TP_STRUCT__entry(
+ __field(u8, generation)
+ __dynamic_array(u8, port_status, self_id_sequence_get_port_capacity(quadlet_count))
+ __dynamic_array(u32, self_id_sequence, quadlet_count)
+ ),
+ TP_fast_assign(
+ __entry->generation = generation;
+ copy_port_status(__get_dynamic_array(port_status), __get_dynamic_array_len(port_status),
+ self_id_sequence, quadlet_count);
+ memcpy(__get_dynamic_array(self_id_sequence), self_id_sequence,
+ __get_dynamic_array_len(self_id_sequence));
+ ),
+ TP_printk(
+ "generation=%u phy_id=0x%02x link_active=%s gap_count=%u scode=%u contender=%s power_class=%u initiated_reset=%s port_status=%s self_id_sequence=%s",
+ __entry->generation,
+ PHY_PACKET_SELF_ID_GET_PHY_ID(__get_dynamic_array(self_id_sequence)),
+ PHY_PACKET_SELF_ID_GET_LINK_ACTIVE(__get_dynamic_array(self_id_sequence)) ? "true" : "false",
+ PHY_PACKET_SELF_ID_GET_GAP_COUNT(__get_dynamic_array(self_id_sequence)),
+ PHY_PACKET_SELF_ID_GET_SCODE(__get_dynamic_array(self_id_sequence)),
+ PHY_PACKET_SELF_ID_GET_CONTENDER(__get_dynamic_array(self_id_sequence)) ? "true" : "false",
+ PHY_PACKET_SELF_ID_GET_POWER_CLASS(__get_dynamic_array(self_id_sequence)),
+ PHY_PACKET_SELF_ID_GET_INITIATED_RESET(__get_dynamic_array(self_id_sequence)) ? "true" : "false",
+ __print_array(__get_dynamic_array(port_status), __get_dynamic_array_len(port_status), 1),
+ __print_array(__get_dynamic_array(self_id_sequence),
+ __get_dynamic_array_len(self_id_sequence) / QUADLET_SIZE, QUADLET_SIZE)
+ )
+);
+
#undef QUADLET_SIZE
#endif // _FIREWIRE_TRACE_EVENT_H
--
2.43.0
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