linux-kernel - Re: [PATCH v3 23/25] cxl/mem: Trace Dynamic capacity Event Record

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Message-ID: <ZtoIpQ343e0NKoI6@leg>
Date: Thu, 5 Sep 2024 12:38:13 -0700
From: Fan Ni <nifan.cxl@...il.com>
To: ira.weiny@...el.com
Cc: Dave Jiang <dave.jiang@...el.com>,
	Jonathan Cameron <Jonathan.Cameron@...wei.com>,
	Navneet Singh <navneet.singh@...el.com>, Chris Mason <clm@...com>,
	Josef Bacik <josef@...icpanda.com>, David Sterba <dsterba@...e.com>,
	Petr Mladek <pmladek@...e.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	Rasmus Villemoes <linux@...musvillemoes.dk>,
	Sergey Senozhatsky <senozhatsky@...omium.org>,
	Jonathan Corbet <corbet@....net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Dan Williams <dan.j.williams@...el.com>,
	Davidlohr Bueso <dave@...olabs.net>,
	Alison Schofield <alison.schofield@...el.com>,
	Vishal Verma <vishal.l.verma@...el.com>,
	linux-btrfs@...r.kernel.org, linux-cxl@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
	nvdimm@...ts.linux.dev
Subject: Re: [PATCH v3 23/25] cxl/mem: Trace Dynamic capacity Event Record

On Fri, Aug 16, 2024 at 09:44:31AM -0500, ira.weiny@...el.com wrote:
> From: Navneet Singh <navneet.singh@...el.com>
> 
> CXL rev 3.1 section 8.2.9.2.1 adds the Dynamic Capacity Event Records.
> User space can use trace events for debugging of DC capacity changes.
> 
> Add DC trace points to the trace log.
> 
> Signed-off-by: Navneet Singh <navneet.singh@...el.com>
> Signed-off-by: Ira Weiny <ira.weiny@...el.com>
> 
With the following cxl spec version fixed, 

Reviewed-by: Fan Ni <fan.ni@...sung.com>

> ---
> Changes:
> [Alison: Update commit message]
> ---
>  drivers/cxl/core/mbox.c  |  4 +++
>  drivers/cxl/core/trace.h | 65 ++++++++++++++++++++++++++++++++++++++++++++++++
>  2 files changed, 69 insertions(+)
> 
> diff --git a/drivers/cxl/core/mbox.c b/drivers/cxl/core/mbox.c
> index d43ac8eabf56..8202fc6c111d 100644
> --- a/drivers/cxl/core/mbox.c
> +++ b/drivers/cxl/core/mbox.c
> @@ -977,6 +977,10 @@ static void __cxl_event_trace_record(const struct cxl_memdev *cxlmd,
>  		ev_type = CXL_CPER_EVENT_DRAM;
>  	else if (uuid_equal(uuid, &CXL_EVENT_MEM_MODULE_UUID))
>  		ev_type = CXL_CPER_EVENT_MEM_MODULE;
> +	else if (uuid_equal(uuid, &CXL_EVENT_DC_EVENT_UUID)) {
> +		trace_cxl_dynamic_capacity(cxlmd, type, &record->event.dcd);
> +		return;
> +	}
>  
>  	cxl_event_trace_record(cxlmd, type, ev_type, uuid, &record->event);
>  }
> diff --git a/drivers/cxl/core/trace.h b/drivers/cxl/core/trace.h
> index 9167cfba7f59..a3a5269311ee 100644
> --- a/drivers/cxl/core/trace.h
> +++ b/drivers/cxl/core/trace.h
> @@ -731,6 +731,71 @@ TRACE_EVENT(cxl_poison,
>  	)
>  );
>  
> +/*
> + * DYNAMIC CAPACITY Event Record - DER
> + *
> + * CXL rev 3.0 section 8.2.9.2.1.5 Table 8-47
Update to reflect r3.1
Fan
> + */
> +
> +#define CXL_DC_ADD_CAPACITY			0x00
> +#define CXL_DC_REL_CAPACITY			0x01
> +#define CXL_DC_FORCED_REL_CAPACITY		0x02
> +#define CXL_DC_REG_CONF_UPDATED			0x03
> +#define show_dc_evt_type(type)	__print_symbolic(type,		\
> +	{ CXL_DC_ADD_CAPACITY,	"Add capacity"},		\
> +	{ CXL_DC_REL_CAPACITY,	"Release capacity"},		\
> +	{ CXL_DC_FORCED_REL_CAPACITY,	"Forced capacity release"},	\
> +	{ CXL_DC_REG_CONF_UPDATED,	"Region Configuration Updated"	} \
> +)
> +
> +TRACE_EVENT(cxl_dynamic_capacity,
> +
> +	TP_PROTO(const struct cxl_memdev *cxlmd, enum cxl_event_log_type log,
> +		 struct cxl_event_dcd *rec),
> +
> +	TP_ARGS(cxlmd, log, rec),
> +
> +	TP_STRUCT__entry(
> +		CXL_EVT_TP_entry
> +
> +		/* Dynamic capacity Event */
> +		__field(u8, event_type)
> +		__field(u16, hostid)
> +		__field(u8, region_id)
> +		__field(u64, dpa_start)
> +		__field(u64, length)
> +		__array(u8, tag, CXL_EXTENT_TAG_LEN)
> +		__field(u16, sh_extent_seq)
> +	),
> +
> +	TP_fast_assign(
> +		CXL_EVT_TP_fast_assign(cxlmd, log, rec->hdr);
> +
> +		/* Dynamic_capacity Event */
> +		__entry->event_type = rec->event_type;
> +
> +		/* DCD event record data */
> +		__entry->hostid = le16_to_cpu(rec->host_id);
> +		__entry->region_id = rec->region_index;
> +		__entry->dpa_start = le64_to_cpu(rec->extent.start_dpa);
> +		__entry->length = le64_to_cpu(rec->extent.length);
> +		memcpy(__entry->tag, &rec->extent.tag, CXL_EXTENT_TAG_LEN);
> +		__entry->sh_extent_seq = le16_to_cpu(rec->extent.shared_extn_seq);
> +	),
> +
> +	CXL_EVT_TP_printk("event_type='%s' host_id='%d' region_id='%d' " \
> +		"starting_dpa=%llx length=%llx tag=%s " \
> +		"shared_extent_sequence=%d",
> +		show_dc_evt_type(__entry->event_type),
> +		__entry->hostid,
> +		__entry->region_id,
> +		__entry->dpa_start,
> +		__entry->length,
> +		__print_hex(__entry->tag, CXL_EXTENT_TAG_LEN),
> +		__entry->sh_extent_seq
> +	)
> +);
> +
>  #endif /* _CXL_EVENTS_H */
>  
>  #define TRACE_INCLUDE_FILE trace
> 
> -- 
> 2.45.2
>