linux-kernel - RE: [PATCH V3 4/8] cxl/mem: Trace DRAM Event Record

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Date:   Fri, 9 Dec 2022 14:14:41 -0800
From:   Dan Williams <dan.j.williams@...el.com>
To:     <ira.weiny@...el.com>, Dan Williams <dan.j.williams@...el.com>
CC:     Ira Weiny <ira.weiny@...el.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Alison Schofield <alison.schofield@...el.com>,
        Vishal Verma <vishal.l.verma@...el.com>,
        Davidlohr Bueso <dave@...olabs.net>,
        "Jonathan Cameron" <Jonathan.Cameron@...wei.com>,
        Dave Jiang <dave.jiang@...el.com>,
        <linux-kernel@...r.kernel.org>, <linux-pci@...r.kernel.org>,
        <linux-acpi@...r.kernel.org>, <linux-cxl@...r.kernel.org>
Subject: RE: [PATCH V3 4/8] cxl/mem: Trace DRAM Event Record

ira.weiny@ 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.
> 
> Signed-off-by: Ira Weiny <ira.weiny@...el.com>
> 
> ---
> Changes from v2:
> 	Dan
> 		Move tracing to cxl core
> 		Remove trace_*_enabled() calls
> 		Pass struct device to trace points
> 
> 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  | 13 ++++++
>  drivers/cxl/core/trace.h | 92 ++++++++++++++++++++++++++++++++++++++++
>  drivers/cxl/cxlmem.h     | 23 ++++++++++
>  3 files changed, 128 insertions(+)
> 
> diff --git a/drivers/cxl/core/mbox.c b/drivers/cxl/core/mbox.c
> index 0d8c66f1cdc5..2fa4645f0ed9 100644
> --- a/drivers/cxl/core/mbox.c
> +++ b/drivers/cxl/core/mbox.c
> @@ -726,6 +726,14 @@ 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 void cxl_trace_event_record(const struct device *dev,
>  				   enum cxl_event_log_type type,
>  				   struct cxl_event_record_raw *record)
> @@ -738,6 +746,11 @@ static void cxl_trace_event_record(const struct device *dev,
>  
>  		trace_cxl_general_media(dev, 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, type, rec);
> +		return;

I think I mentioned this before, but rather than a "return" in every
branch just make the 'unknown' case the final else in this if block.

With that feel free to add:

Reviewed-by: Dan Williams <dan.j.williams@...el.com>