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

From: Jonathan Cameron
Date: Tue Oct 11 2022 - 09:47:30 EST


On Mon, 10 Oct 2022 15:41:26 -0700
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.
>
> Signed-off-by: Ira Weiny <ira.weiny@xxxxxxxxx>
>

Trivial comments inline

Reviewed-by: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>

> diff --git a/include/trace/events/cxl.h b/include/trace/events/cxl.h
> index 82a8d3b750a2..7a90cfea348b 100644
> --- a/include/trace/events/cxl.h
> +++ b/include/trace/events/cxl.h
> @@ -230,6 +230,100 @@ TRACE_EVENT(general_media,
> )
> );
>

> +
> +TRACE_EVENT(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, phys_addr)
> + __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)
> + __array(u8, reserved, CXL_EVENT_DER_RES_SIZE)

If we are going to have this, why not put it at the end? Will that affect the
packing badly?

> + __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 */
> + ),
> +
> + TP_fast_assign(
> + CXL_EVT_TP_fast_assign(dev_name, log, rec->hdr);
> +
> + /* DRAM */
> + __entry->phys_addr = le64_to_cpu(rec->phys_addr);
> + __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);
> + memcpy(__entry->reserved, &rec->reserved,
> + CXL_EVENT_DER_RES_SIZE);
> + ),
> +
> + CXL_EVT_TP_printk("phys_addr=%llx volatile=%s desc='%s' type='%s' " \
> + "trans_type='%s' channel=%u rank=%u nibble_mask=%x " \
> + "bank_group=%u bank=%u row=%u column=%u cor_mask=%s " \
> + "valid_flags='%s' reserved=%s",
> + __entry->phys_addr & CXL_GMER_PHYS_ADDR_MASK,
> + (__entry->phys_addr & CXL_GMER_PHYS_ADDR_VOLATILE) ? "TRUE" : "FALSE",
> + 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),
> + __print_hex(__entry->reserved, CXL_EVENT_DER_RES_SIZE)
> + )
Probably one less tab on that trailing )?

> +);
> +
> #endif /* _CXL_TRACE_EVENTS_H */
>
> /* This part must be outside protection */