RE: [PATCH V2 05/11] cxl/mem: Trace General Media Event Record

From: Dan Williams
Date: Fri Dec 02 2022 - 01:18:20 EST

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In reply to: Dave Jiang: "Re: [PATCH V2 05/11] cxl/mem: Trace General Media Event Record"
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ira.weiny@ wrote:
> From: Ira Weiny <ira.weiny@xxxxxxxxx>
>
> CXL rev 3.0 section 8.2.9.2.1.1 defines the General Media Event Record.
>
> Determine if the event read is a general media record and if so trace
> the record as a General Media Event Record.
>
> Reviewed-by: Steven Rostedt (Google) <rostedt@xxxxxxxxxxx>
> Reviewed-by: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>
> Signed-off-by: Ira Weiny <ira.weiny@xxxxxxxxx>
>
> ---
> Changes from V1:
> Jonathan
> fix spec references for CXL rev 3.0
> Make flags all caps
>
> Changes from RFC v2:
> Output DPA flags as a single field
> Ensure names of fields match what TP_print outputs
> Steven
> prefix TRACE_EVENT with 'cxl_'
> Jonathan
> Remove Reserved field
>
> Changes from RFC:
> Add reserved byte array
> Use common CXL event header record macros
> Jonathan
> Use unaligned_le{24,16} for unaligned fields
> Don't use the inverse of phy addr mask
> Dave Jiang
> s/cxl_gen_media_event/general_media
> s/cxl_evt_gen_media/cxl_event_gen_media
> ---
> drivers/cxl/core/mbox.c | 40 ++++++++++--
> drivers/cxl/cxlmem.h | 19 ++++++
> include/trace/events/cxl.h | 124 +++++++++++++++++++++++++++++++++++++
> 3 files changed, 179 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/cxl/core/mbox.c b/drivers/cxl/core/mbox.c
> index 076a3df0ba38..20191fe55bba 100644
> --- a/drivers/cxl/core/mbox.c
> +++ b/drivers/cxl/core/mbox.c
> @@ -709,6 +709,38 @@ int cxl_enumerate_cmds(struct cxl_dev_state *cxlds)
> }
> EXPORT_SYMBOL_NS_GPL(cxl_enumerate_cmds, CXL);
>
> +/*
> + * General Media Event Record
> + * CXL rev 3.0 Section 8.2.9.2.1.1; Table 8-43
> + */
> +static const uuid_t gen_media_event_uuid =
> + UUID_INIT(0xfbcd0a77, 0xc260, 0x417f,
> + 0x85, 0xa9, 0x08, 0x8b, 0x16, 0x21, 0xeb, 0xa6);
> +

Move this next to the other UUID_INITs in cxlmem.h.

> +static bool cxl_event_tracing_enabled(void)
> +{
> + return trace_cxl_generic_event_enabled() ||
> + trace_cxl_general_media_enabled();
> +}

...and now the micro-optimization gets more complicated. The mailbox
command is an uncached PCI mmio memcpy(), the incremental cycles this
enabled check is saving would be difficult to spot in a profile. So
unless it has a worthwhile perf-profile impact I prefer the simplicity
of the straight through code.

> +
> +static void cxl_trace_event_record(const char *dev_name,
> + enum cxl_event_log_type type,
> + struct cxl_event_record_raw *record)
> +{
> + uuid_t *id = &record->hdr.id;
> +
> + if (uuid_equal(id, &gen_media_event_uuid)) {
> + struct cxl_event_gen_media *rec =
> + (struct cxl_event_gen_media *)record;
> +
> + trace_cxl_general_media(dev_name, type, rec);
> + return;
> + }
> +
> + /* For unknown record types print just the header */
> + trace_cxl_generic_event(dev_name, type, record);
> +}
> +
> static int cxl_clear_event_record(struct cxl_dev_state *cxlds,
> enum cxl_event_log_type log,
> struct cxl_get_event_payload *get_pl,
> @@ -772,11 +804,11 @@ static void cxl_mem_get_records_log(struct cxl_dev_state *cxlds,
> if (nr_rec > 0) {
> int i;
>
> - if (trace_cxl_generic_event_enabled()) {
> + if (cxl_event_tracing_enabled()) {
> for (i = 0; i < nr_rec; i++)
> - trace_cxl_generic_event(dev_name(cxlds->dev),
> - type,
> - &payload->records[i]);
> + cxl_trace_event_record(dev_name(cxlds->dev),
> + type,
> + &payload->records[i]);

Changing the same lines multiple times in the same series is sometihng
that sets off my complexity alarm bells.

> }
>
> rc = cxl_clear_event_record(cxlds, type, payload, nr_rec);
> diff --git a/drivers/cxl/cxlmem.h b/drivers/cxl/cxlmem.h
> index 1ae9962c5a06..10696debefa8 100644
> --- a/drivers/cxl/cxlmem.h
> +++ b/drivers/cxl/cxlmem.h
> @@ -410,6 +410,25 @@ struct cxl_mbox_clear_event_payload {
> __le16 handle[CXL_CLEAR_EVENT_MAX_HANDLES];
> };
>
> +/*
> + * General Media Event Record
> + * CXL rev 3.0 Section 8.2.9.2.1.1; Table 8-43
> + */
> +#define CXL_EVENT_GEN_MED_COMP_ID_SIZE 0x10
> +struct cxl_event_gen_media {
> + 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 device[3];
> + u8 component_id[CXL_EVENT_GEN_MED_COMP_ID_SIZE];
> + u8 reserved[0x2e];

s/0x2e/46/

> +} __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 c03a1a894af8..a4d6bd64e9bc 100644
> --- a/include/trace/events/cxl.h
> +++ b/include/trace/events/cxl.h
> @@ -118,6 +118,130 @@ TRACE_EVENT(cxl_generic_event,
> __print_hex(__entry->data, CXL_EVENT_RECORD_DATA_LENGTH))
> );
>
> +/*
> + * Physical Address field masks
> + *
> + * General Media Event Record
> + * CXL rev 3.0 Section 8.2.9.2.1.1; Table 8-43
> + *
> + * DRAM Event Record
> + * CXL rev 3.0 section 8.2.9.2.1.2; Table 8-44
> + */
> +#define CXL_DPA_FLAGS_MASK 0x3F
> +#define CXL_DPA_MASK (~CXL_DPA_FLAGS_MASK)
> +
> +#define CXL_DPA_VOLATILE BIT(0)
> +#define CXL_DPA_NOT_REPAIRABLE BIT(1)
> +#define show_dpa_flags(flags) __print_flags(flags, "|", \
> + { CXL_DPA_VOLATILE, "VOLATILE" }, \
> + { CXL_DPA_NOT_REPAIRABLE, "NOT_REPAIRABLE" } \
> +)
> +
> +/*
> + * General Media Event Record - GMER
> + * CXL rev 3.0 Section 8.2.9.2.1.1; Table 8-43
> + */
> +#define CXL_GMER_EVT_DESC_UNCORECTABLE_EVENT BIT(0)
> +#define CXL_GMER_EVT_DESC_THRESHOLD_EVENT BIT(1)
> +#define CXL_GMER_EVT_DESC_POISON_LIST_OVERFLOW BIT(2)
> +#define show_event_desc_flags(flags) __print_flags(flags, "|", \
> + { CXL_GMER_EVT_DESC_UNCORECTABLE_EVENT, "UNCORRECTABLE_EVENT" }, \
> + { CXL_GMER_EVT_DESC_THRESHOLD_EVENT, "THRESHOLD_EVENT" }, \
> + { CXL_GMER_EVT_DESC_POISON_LIST_OVERFLOW, "POISON_LIST_OVERFLOW" } \
> +)
> +
> +#define CXL_GMER_MEM_EVT_TYPE_ECC_ERROR 0x00
> +#define CXL_GMER_MEM_EVT_TYPE_INV_ADDR 0x01
> +#define CXL_GMER_MEM_EVT_TYPE_DATA_PATH_ERROR 0x02
> +#define show_mem_event_type(type) __print_symbolic(type, \
> + { CXL_GMER_MEM_EVT_TYPE_ECC_ERROR, "ECC Error" }, \
> + { CXL_GMER_MEM_EVT_TYPE_INV_ADDR, "Invalid Address" }, \
> + { CXL_GMER_MEM_EVT_TYPE_DATA_PATH_ERROR, "Data Path Error" } \
> +)
> +
> +#define CXL_GMER_TRANS_UNKNOWN 0x00
> +#define CXL_GMER_TRANS_HOST_READ 0x01
> +#define CXL_GMER_TRANS_HOST_WRITE 0x02
> +#define CXL_GMER_TRANS_HOST_SCAN_MEDIA 0x03
> +#define CXL_GMER_TRANS_HOST_INJECT_POISON 0x04
> +#define CXL_GMER_TRANS_INTERNAL_MEDIA_SCRUB 0x05
> +#define CXL_GMER_TRANS_INTERNAL_MEDIA_MANAGEMENT 0x06
> +#define show_trans_type(type) __print_symbolic(type, \
> + { CXL_GMER_TRANS_UNKNOWN, "Unknown" }, \
> + { CXL_GMER_TRANS_HOST_READ, "Host Read" }, \
> + { CXL_GMER_TRANS_HOST_WRITE, "Host Write" }, \
> + { CXL_GMER_TRANS_HOST_SCAN_MEDIA, "Host Scan Media" }, \
> + { CXL_GMER_TRANS_HOST_INJECT_POISON, "Host Inject Poison" }, \
> + { CXL_GMER_TRANS_INTERNAL_MEDIA_SCRUB, "Internal Media Scrub" }, \
> + { CXL_GMER_TRANS_INTERNAL_MEDIA_MANAGEMENT, "Internal Media Management" } \
> +)
> +
> +#define CXL_GMER_VALID_CHANNEL BIT(0)
> +#define CXL_GMER_VALID_RANK BIT(1)
> +#define CXL_GMER_VALID_DEVICE BIT(2)
> +#define CXL_GMER_VALID_COMPONENT BIT(3)
> +#define show_valid_flags(flags) __print_flags(flags, "|", \
> + { CXL_GMER_VALID_CHANNEL, "CHANNEL" }, \
> + { CXL_GMER_VALID_RANK, "RANK" }, \
> + { CXL_GMER_VALID_DEVICE, "DEVICE" }, \
> + { CXL_GMER_VALID_COMPONENT, "COMPONENT" } \
> +)
> +
> +TRACE_EVENT(cxl_general_media,
> +
> + TP_PROTO(const char *dev_name, enum cxl_event_log_type log,
> + struct cxl_event_gen_media *rec),
> +
> + TP_ARGS(dev_name, log, rec),
> +
> + TP_STRUCT__entry(
> + CXL_EVT_TP_entry
> + /* General Media */
> + __field(u64, dpa)
> + __field(u8, descriptor)
> + __field(u8, type)
> + __field(u8, transaction_type)
> + __field(u8, channel)
> + __field(u32, device)
> + __array(u8, comp_id, CXL_EVENT_GEN_MED_COMP_ID_SIZE)
> + __field(u16, validity_flags)
> + /* Following are out of order to pack trace record */
> + __field(u8, rank)
> + __field(u8, dpa_flags)
> + ),
> +
> + TP_fast_assign(
> + CXL_EVT_TP_fast_assign(dev_name, log, rec->hdr);
> +
> + /* General Media */
> + __entry->dpa = le64_to_cpu(rec->phys_addr);
> + __entry->dpa_flags = __entry->dpa & CXL_DPA_FLAGS_MASK;
> + /* Mask after flags have been parsed */
> + __entry->dpa &= CXL_DPA_MASK;
> + __entry->descriptor = rec->descriptor;
> + __entry->type = rec->type;
> + __entry->transaction_type = rec->transaction_type;
> + __entry->channel = rec->channel;
> + __entry->rank = rec->rank;
> + __entry->device = get_unaligned_le24(rec->device);
> + memcpy(__entry->comp_id, &rec->component_id,
> + CXL_EVENT_GEN_MED_COMP_ID_SIZE);
> + __entry->validity_flags = get_unaligned_le16(&rec->validity_flags);
> + ),
> +
> + CXL_EVT_TP_printk("dpa=%llx dpa_flags='%s' " \
> + "descriptor='%s' type='%s' transaction_type='%s' channel=%u rank=%u " \
> + "device=%x comp_id=%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->device,
> + __print_hex(__entry->comp_id, CXL_EVENT_GEN_MED_COMP_ID_SIZE),
> + show_valid_flags(__entry->validity_flags)
> + )
> +);
> +
> #endif /* _CXL_TRACE_EVENTS_H */
>
> /* This part must be outside protection */
> --
> 2.37.2
>

Next message: Dmitry Baryshkov: "Re: [PATCH v7 0/5] Add data-lanes and link-frequencies to dp_out endpoint"
Previous message: Christoph Hellwig: "Re: [RFC PATCH] panic: Add new taint flag for fault injection"
In reply to: Dave Jiang: "Re: [PATCH V2 05/11] cxl/mem: Trace General Media Event Record"
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