Re: [PATCH V2 06/11] cxl/mem: Trace DRAM Event Record

From: Dave Jiang
Date: Thu Dec 01 2022 - 13:55:49 EST



On 11/30/2022 5:27 PM, ira.weiny@xxxxxxxxx wrote:
From: Ira Weiny <ira.weiny@xxxxxxxxx>

CXL rev 3.0 section 8.2.9.2.1.2 defines the DRAM Event Record.

Determine if the event read is a DRAM event record and if so trace the
record.

Reviewed-by: Steven Rostedt (Google) <rostedt@xxxxxxxxxxx>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>
Reviewed-by: Dave Jiang <dave.jiang@xxxxxxxxx>
Signed-off-by: Ira Weiny <ira.weiny@xxxxxxxxx>

Reviewed-by: Dave Jiang <dave.jiang@xxxxxxxxx>

---
Changes from RFC v2:
Output DPA flags as a separate field.
Ensure field names match TP_print output
Steven
prefix TRACE_EVENT with 'cxl_'
Jonathan
Formatting fix
Remove reserved field

Changes from RFC:
Add reserved byte data
Use new CXL header macros
Jonathan
Use get_unaligned_le{24,16}() for unaligned fields
Use 'else if'
Dave Jiang
s/cxl_dram_event/dram
s/cxl_evt_dram_rec/cxl_event_dram
Adjust for new phys addr mask
---
drivers/cxl/core/mbox.c | 16 ++++++-
drivers/cxl/cxlmem.h | 23 ++++++++++
include/trace/events/cxl.h | 92 ++++++++++++++++++++++++++++++++++++++
3 files changed, 130 insertions(+), 1 deletion(-)

diff --git a/drivers/cxl/core/mbox.c b/drivers/cxl/core/mbox.c
index 20191fe55bba..66fc50d89bf4 100644
--- a/drivers/cxl/core/mbox.c
+++ b/drivers/cxl/core/mbox.c
@@ -717,10 +717,19 @@ static const uuid_t gen_media_event_uuid =
UUID_INIT(0xfbcd0a77, 0xc260, 0x417f,
0x85, 0xa9, 0x08, 0x8b, 0x16, 0x21, 0xeb, 0xa6);
+/*
+ * DRAM Event Record
+ * CXL rev 3.0 section 8.2.9.2.1.2; Table 8-44
+ */
+static const uuid_t dram_event_uuid =
+ UUID_INIT(0x601dcbb3, 0x9c06, 0x4eab,
+ 0xb8, 0xaf, 0x4e, 0x9b, 0xfb, 0x5c, 0x96, 0x24);
+
static bool cxl_event_tracing_enabled(void)
{
return trace_cxl_generic_event_enabled() ||
- trace_cxl_general_media_enabled();
+ trace_cxl_general_media_enabled() ||
+ trace_cxl_dram_enabled();
}
static void cxl_trace_event_record(const char *dev_name,
@@ -735,6 +744,11 @@ static void cxl_trace_event_record(const char *dev_name,
trace_cxl_general_media(dev_name, type, rec);
return;
+ } else if (uuid_equal(id, &dram_event_uuid)) {
+ struct cxl_event_dram *rec = (struct cxl_event_dram *)record;
+
+ trace_cxl_dram(dev_name, type, rec);
+ return;
}
/* For unknown record types print just the header */
diff --git a/drivers/cxl/cxlmem.h b/drivers/cxl/cxlmem.h
index 10696debefa8..f5f63a475478 100644
--- a/drivers/cxl/cxlmem.h
+++ b/drivers/cxl/cxlmem.h
@@ -429,6 +429,29 @@ struct cxl_event_gen_media {
u8 reserved[0x2e];
} __packed;
+/*
+ * DRAM Event Record - DER
+ * CXL rev 3.0 section 8.2.9.2.1.2; Table 3-44
+ */
+#define CXL_EVENT_DER_CORRECTION_MASK_SIZE 0x20
+struct cxl_event_dram {
+ struct cxl_event_record_hdr hdr;
+ __le64 phys_addr;
+ u8 descriptor;
+ u8 type;
+ u8 transaction_type;
+ u8 validity_flags[2];
+ u8 channel;
+ u8 rank;
+ u8 nibble_mask[3];
+ u8 bank_group;
+ u8 bank;
+ u8 row[3];
+ u8 column[2];
+ u8 correction_mask[CXL_EVENT_DER_CORRECTION_MASK_SIZE];
+ u8 reserved[0x17];
+} __packed;
+
struct cxl_mbox_get_partition_info {
__le64 active_volatile_cap;
__le64 active_persistent_cap;
diff --git a/include/trace/events/cxl.h b/include/trace/events/cxl.h
index a4d6bd64e9bc..474390f895d9 100644
--- a/include/trace/events/cxl.h
+++ b/include/trace/events/cxl.h
@@ -242,6 +242,98 @@ TRACE_EVENT(cxl_general_media,
)
);
+/*
+ * DRAM Event Record - DER
+ *
+ * CXL rev 3.0 section 8.2.9.2.1.2; Table 8-44
+ */
+/*
+ * DRAM Event Record defines many fields the same as the General Media Event
+ * Record. Reuse those definitions as appropriate.
+ */
+#define CXL_DER_VALID_CHANNEL BIT(0)
+#define CXL_DER_VALID_RANK BIT(1)
+#define CXL_DER_VALID_NIBBLE BIT(2)
+#define CXL_DER_VALID_BANK_GROUP BIT(3)
+#define CXL_DER_VALID_BANK BIT(4)
+#define CXL_DER_VALID_ROW BIT(5)
+#define CXL_DER_VALID_COLUMN BIT(6)
+#define CXL_DER_VALID_CORRECTION_MASK BIT(7)
+#define show_dram_valid_flags(flags) __print_flags(flags, "|", \
+ { CXL_DER_VALID_CHANNEL, "CHANNEL" }, \
+ { CXL_DER_VALID_RANK, "RANK" }, \
+ { CXL_DER_VALID_NIBBLE, "NIBBLE" }, \
+ { CXL_DER_VALID_BANK_GROUP, "BANK GROUP" }, \
+ { CXL_DER_VALID_BANK, "BANK" }, \
+ { CXL_DER_VALID_ROW, "ROW" }, \
+ { CXL_DER_VALID_COLUMN, "COLUMN" }, \
+ { CXL_DER_VALID_CORRECTION_MASK, "CORRECTION MASK" } \
+)
+
+TRACE_EVENT(cxl_dram,
+
+ TP_PROTO(const char *dev_name, enum cxl_event_log_type log,
+ struct cxl_event_dram *rec),
+
+ TP_ARGS(dev_name, log, rec),
+
+ TP_STRUCT__entry(
+ CXL_EVT_TP_entry
+ /* DRAM */
+ __field(u64, dpa)
+ __field(u8, descriptor)
+ __field(u8, type)
+ __field(u8, transaction_type)
+ __field(u8, channel)
+ __field(u16, validity_flags)
+ __field(u16, column) /* Out of order to pack trace record */
+ __field(u32, nibble_mask)
+ __field(u32, row)
+ __array(u8, cor_mask, CXL_EVENT_DER_CORRECTION_MASK_SIZE)
+ __field(u8, rank) /* Out of order to pack trace record */
+ __field(u8, bank_group) /* Out of order to pack trace record */
+ __field(u8, bank) /* Out of order to pack trace record */
+ __field(u8, dpa_flags) /* Out of order to pack trace record */
+ ),
+
+ TP_fast_assign(
+ CXL_EVT_TP_fast_assign(dev_name, log, rec->hdr);
+
+ /* DRAM */
+ __entry->dpa = le64_to_cpu(rec->phys_addr);
+ __entry->dpa_flags = __entry->dpa & CXL_DPA_FLAGS_MASK;
+ __entry->dpa &= CXL_DPA_MASK;
+ __entry->descriptor = rec->descriptor;
+ __entry->type = rec->type;
+ __entry->transaction_type = rec->transaction_type;
+ __entry->validity_flags = get_unaligned_le16(rec->validity_flags);
+ __entry->channel = rec->channel;
+ __entry->rank = rec->rank;
+ __entry->nibble_mask = get_unaligned_le24(rec->nibble_mask);
+ __entry->bank_group = rec->bank_group;
+ __entry->bank = rec->bank;
+ __entry->row = get_unaligned_le24(rec->row);
+ __entry->column = get_unaligned_le16(rec->column);
+ memcpy(__entry->cor_mask, &rec->correction_mask,
+ CXL_EVENT_DER_CORRECTION_MASK_SIZE);
+ ),
+
+ CXL_EVT_TP_printk("dpa=%llx dpa_flags='%s' descriptor='%s' type='%s' " \
+ "transaction_type='%s' channel=%u rank=%u nibble_mask=%x " \
+ "bank_group=%u bank=%u row=%u column=%u cor_mask=%s " \
+ "validity_flags='%s'",
+ __entry->dpa, show_dpa_flags(__entry->dpa_flags),
+ show_event_desc_flags(__entry->descriptor),
+ show_mem_event_type(__entry->type),
+ show_trans_type(__entry->transaction_type),
+ __entry->channel, __entry->rank, __entry->nibble_mask,
+ __entry->bank_group, __entry->bank,
+ __entry->row, __entry->column,
+ __print_hex(__entry->cor_mask, CXL_EVENT_DER_CORRECTION_MASK_SIZE),
+ show_dram_valid_flags(__entry->validity_flags)
+ )
+);
+
#endif /* _CXL_TRACE_EVENTS_H */
/* This part must be outside protection */