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Date: Tue, 15 Nov 2022 15:26:07 -0700
From: Dave Jiang <dave.jiang@...el.com>
To: ira.weiny@...el.com, Dan Williams <dan.j.williams@...el.com>
Cc: Jonathan Cameron <Jonathan.Cameron@...wei.com>,
Alison Schofield <alison.schofield@...el.com>,
Vishal Verma <vishal.l.verma@...el.com>,
Ben Widawsky <bwidawsk@...nel.org>,
Steven Rostedt <rostedt@...dmis.org>,
Davidlohr Bueso <dave@...olabs.net>,
linux-kernel@...r.kernel.org, linux-cxl@...r.kernel.org
Subject: Re: [PATCH 06/11] cxl/mem: Trace DRAM Event Record
On 11/10/2022 10:57 AM, ira.weiny@...el.com wrote:
> From: Ira Weiny <ira.weiny@...el.com>
>
> 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: Jonathan Cameron <Jonathan.Cameron@...wei.com>
> Signed-off-by: Ira Weiny <ira.weiny@...el.com>
Reviewed-by: Dave Jiang <dave.jiang@...el.com>
>
> ---
> 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 6d48fdb07700..b03d7b856f3d 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 86197f3168c7..87c877f0940d 100644
> --- a/drivers/cxl/cxlmem.h
> +++ b/drivers/cxl/cxlmem.h
> @@ -431,6 +431,29 @@ 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 a0c20e110708..37bbe59905af 100644
> --- a/include/trace/events/cxl.h
> +++ b/include/trace/events/cxl.h
> @@ -243,6 +243,98 @@ 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 */
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