[PATCH RFC v4 1/6] cxl/trace: Pass uuid explicitly to event traces

Ira Weiny
2023-11-09T22:07:24Z

CPER CXL events do not have a UUID associated with them. It is
desirable to share event structures between the CPER CXL event and the
CXL event log events.

Pass the UUID explicitly to each trace event to be able to remove the
UUID from the event structures.

Originally it was desirable to remove the UUID from the well known event
because the UUID value was redundant. However, the trace API was
already in place.[1]

[1] https://lore.kernel.org/all/36f2d12934d64a278f2c0313cbd01abc@huawei.com/

Signed-off-by: Ira Weiny <ira.weiny@intel.com>

---
Changes from RFC V3:
[iweiny: drop remove uuid patch; replaced it with this one]
---
drivers/cxl/core/mbox.c | 8 ++++----
drivers/cxl/core/trace.h | 32 ++++++++++++++++----------------
2 files changed, 20 insertions(+), 20 deletions(-)

diff --git a/drivers/cxl/core/mbox.c b/drivers/cxl/core/mbox.c
index 4df4f614f490..43aad71810e2 100644
--- a/drivers/cxl/core/mbox.c
+++ b/drivers/cxl/core/mbox.c
@@ -870,19 +870,19 @@ static void cxl_event_trace_record(const struct cxl_memdev *cxlmd,
struct cxl_event_gen_media *rec =
(struct cxl_event_gen_media *)record;

- trace_cxl_general_media(cxlmd, type, rec);
+ trace_cxl_general_media(cxlmd, type, id, rec);
} else if (uuid_equal(id, &dram_event_uuid)) {
struct cxl_event_dram *rec = (struct cxl_event_dram *)record;

- trace_cxl_dram(cxlmd, type, rec);
+ trace_cxl_dram(cxlmd, type, id, rec);
} else if (uuid_equal(id, &mem_mod_event_uuid)) {
struct cxl_event_mem_module *rec =
(struct cxl_event_mem_module *)record;

- trace_cxl_memory_module(cxlmd, type, rec);
+ trace_cxl_memory_module(cxlmd, type, id, rec);
} else {
/* For unknown record types print just the header */
- trace_cxl_generic_event(cxlmd, type, record);
+ trace_cxl_generic_event(cxlmd, type, id, record);
}
}

diff --git a/drivers/cxl/core/trace.h b/drivers/cxl/core/trace.h
index a0b5819bc70b..2aef185f4cd0 100644
--- a/drivers/cxl/core/trace.h
+++ b/drivers/cxl/core/trace.h
@@ -189,7 +189,7 @@ TRACE_EVENT(cxl_overflow,
__string(memdev, dev_name(&cxlmd->dev)) \
__string(host, dev_name(cxlmd->dev.parent)) \
__field(int, log) \
- __field_struct(uuid_t, hdr_uuid) \
+ __field_struct(uuid_t, uuid) \
__field(u64, serial) \
__field(u32, hdr_flags) \
__field(u16, hdr_handle) \
@@ -198,12 +198,12 @@ TRACE_EVENT(cxl_overflow,
__field(u8, hdr_length) \
__field(u8, hdr_maint_op_class)

-#define CXL_EVT_TP_fast_assign(cxlmd, l, hdr) \
+#define CXL_EVT_TP_fast_assign(cxlmd, l, uuid, hdr) \
__assign_str(memdev, dev_name(&(cxlmd)->dev)); \
__assign_str(host, dev_name((cxlmd)->dev.parent)); \
__entry->log = (l); \
__entry->serial = (cxlmd)->cxlds->serial; \
- memcpy(&__entry->hdr_uuid, &(hdr).id, sizeof(uuid_t)); \
+ memcpy(&__entry->uuid, (uuid), sizeof(uuid_t)); \
__entry->hdr_length = (hdr).length; \
__entry->hdr_flags = get_unaligned_le24((hdr).flags); \
__entry->hdr_handle = le16_to_cpu((hdr).handle); \
@@ -217,7 +217,7 @@ TRACE_EVENT(cxl_overflow,
"maint_op_class=%u : " fmt, \
__get_str(memdev), __get_str(host), __entry->serial, \
cxl_event_log_type_str(__entry->log), \
- __entry->hdr_timestamp, &__entry->hdr_uuid, __entry->hdr_length,\
+ __entry->hdr_timestamp, &__entry->uuid, __entry->hdr_length, \
show_hdr_flags(__entry->hdr_flags), __entry->hdr_handle, \
__entry->hdr_related_handle, __entry->hdr_maint_op_class, \
##__VA_ARGS__)
@@ -225,9 +225,9 @@ TRACE_EVENT(cxl_overflow,
TRACE_EVENT(cxl_generic_event,

TP_PROTO(const struct cxl_memdev *cxlmd, enum cxl_event_log_type log,
- struct cxl_event_record_raw *rec),
+ const uuid_t *uuid, struct cxl_event_record_raw *rec),

- TP_ARGS(cxlmd, log, rec),
+ TP_ARGS(cxlmd, log, uuid, rec),

TP_STRUCT__entry(
CXL_EVT_TP_entry
@@ -235,7 +235,7 @@ TRACE_EVENT(cxl_generic_event,
),

TP_fast_assign(
- CXL_EVT_TP_fast_assign(cxlmd, log, rec->hdr);
+ CXL_EVT_TP_fast_assign(cxlmd, log, uuid, rec->hdr);
memcpy(__entry->data, &rec->data, CXL_EVENT_RECORD_DATA_LENGTH);
),

@@ -315,9 +315,9 @@ TRACE_EVENT(cxl_generic_event,
TRACE_EVENT(cxl_general_media,

TP_PROTO(const struct cxl_memdev *cxlmd, enum cxl_event_log_type log,
- struct cxl_event_gen_media *rec),
+ const uuid_t *uuid, struct cxl_event_gen_media *rec),

- TP_ARGS(cxlmd, log, rec),
+ TP_ARGS(cxlmd, log, uuid, rec),

TP_STRUCT__entry(
CXL_EVT_TP_entry
@@ -336,7 +336,7 @@ TRACE_EVENT(cxl_general_media,
),

TP_fast_assign(
- CXL_EVT_TP_fast_assign(cxlmd, log, rec->hdr);
+ CXL_EVT_TP_fast_assign(cxlmd, log, uuid, rec->hdr);

/* General Media */
__entry->dpa = le64_to_cpu(rec->phys_addr);
@@ -398,9 +398,9 @@ TRACE_EVENT(cxl_general_media,
TRACE_EVENT(cxl_dram,

TP_PROTO(const struct cxl_memdev *cxlmd, enum cxl_event_log_type log,
- struct cxl_event_dram *rec),
+ const uuid_t *uuid, struct cxl_event_dram *rec),

- TP_ARGS(cxlmd, log, rec),
+ TP_ARGS(cxlmd, log, uuid, rec),

TP_STRUCT__entry(
CXL_EVT_TP_entry
@@ -422,7 +422,7 @@ TRACE_EVENT(cxl_dram,
),

TP_fast_assign(
- CXL_EVT_TP_fast_assign(cxlmd, log, rec->hdr);
+ CXL_EVT_TP_fast_assign(cxlmd, log, uuid, rec->hdr);

/* DRAM */
__entry->dpa = le64_to_cpu(rec->phys_addr);
@@ -547,9 +547,9 @@ TRACE_EVENT(cxl_dram,
TRACE_EVENT(cxl_memory_module,

TP_PROTO(const struct cxl_memdev *cxlmd, enum cxl_event_log_type log,
- struct cxl_event_mem_module *rec),
+ const uuid_t *uuid, struct cxl_event_mem_module *rec),

- TP_ARGS(cxlmd, log, rec),
+ TP_ARGS(cxlmd, log, uuid, rec),

TP_STRUCT__entry(
CXL_EVT_TP_entry
@@ -569,7 +569,7 @@ TRACE_EVENT(cxl_memory_module,
),

TP_fast_assign(
- CXL_EVT_TP_fast_assign(cxlmd, log, rec->hdr);
+ CXL_EVT_TP_fast_assign(cxlmd, log, uuid, rec->hdr);

/* Memory Module Event */
__entry->event_type = rec->event_type;

--
2.41.0