Re: [PATCH 1/3] drm/xe: Add trace to lrc timestamp update

[Nirmoy Das <nirmoy.das@linux.intel.com>]

On 10/26/2024 8:26 AM, Lucas De Marchi wrote:
> Help debugging when LRC timestamp is updated for a exec queue.
>
> Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>


Reviewed-by: Nirmoy Das <nirmoy.das@intel.com>

> ---
>  drivers/gpu/drm/xe/Makefile       |  1 +
>  drivers/gpu/drm/xe/xe_lrc.c       |  3 ++
>  drivers/gpu/drm/xe/xe_trace_lrc.c |  9 ++++++
>  drivers/gpu/drm/xe/xe_trace_lrc.h | 52 +++++++++++++++++++++++++++++++
>  4 files changed, 65 insertions(+)
>  create mode 100644 drivers/gpu/drm/xe/xe_trace_lrc.c
>  create mode 100644 drivers/gpu/drm/xe/xe_trace_lrc.h
>
> diff --git a/drivers/gpu/drm/xe/Makefile b/drivers/gpu/drm/xe/Makefile
> index bc7a04ce69fd..21d69935c336 100644
> --- a/drivers/gpu/drm/xe/Makefile
> +++ b/drivers/gpu/drm/xe/Makefile
> @@ -101,6 +101,7 @@ xe-y += xe_bb.o \
>  	xe_trace.o \
>  	xe_trace_bo.o \
>  	xe_trace_guc.o \
> +	xe_trace_lrc.o \
>  	xe_ttm_sys_mgr.o \
>  	xe_ttm_stolen_mgr.o \
>  	xe_ttm_vram_mgr.o \
> diff --git a/drivers/gpu/drm/xe/xe_lrc.c b/drivers/gpu/drm/xe/xe_lrc.c
> index 4f64c7f4e68d..4b65da77c6e0 100644
> --- a/drivers/gpu/drm/xe/xe_lrc.c
> +++ b/drivers/gpu/drm/xe/xe_lrc.c
> @@ -25,6 +25,7 @@
>  #include "xe_map.h"
>  #include "xe_memirq.h"
>  #include "xe_sriov.h"
> +#include "xe_trace_lrc.h"
>  #include "xe_vm.h"
>  #include "xe_wa.h"
>  
> @@ -1758,5 +1759,7 @@ u32 xe_lrc_update_timestamp(struct xe_lrc *lrc, u32 *old_ts)
>  
>  	lrc->ctx_timestamp = xe_lrc_ctx_timestamp(lrc);
>  
> +	trace_xe_lrc_update_timestamp(lrc, *old_ts);
> +
>  	return lrc->ctx_timestamp;
>  }
> diff --git a/drivers/gpu/drm/xe/xe_trace_lrc.c b/drivers/gpu/drm/xe/xe_trace_lrc.c
> new file mode 100644
> index 000000000000..ab9b7e2970bc
> --- /dev/null
> +++ b/drivers/gpu/drm/xe/xe_trace_lrc.c
> @@ -0,0 +1,9 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * Copyright © 2024 Intel Corporation
> + */
> +
> +#ifndef __CHECKER__
> +#define CREATE_TRACE_POINTS
> +#include "xe_trace_lrc.h"
> +#endif
> diff --git a/drivers/gpu/drm/xe/xe_trace_lrc.h b/drivers/gpu/drm/xe/xe_trace_lrc.h
> new file mode 100644
> index 000000000000..5c669a0b2180
> --- /dev/null
> +++ b/drivers/gpu/drm/xe/xe_trace_lrc.h
> @@ -0,0 +1,52 @@
> +/* SPDX-License-Identifier: GPL-2.0-only */
> +/*
> + * Copyright © 2024 Intel Corporation
> + */
> +
> +#undef TRACE_SYSTEM
> +#define TRACE_SYSTEM xe
> +
> +#if !defined(_XE_TRACE_LRC_H_) || defined(TRACE_HEADER_MULTI_READ)
> +#define _XE_TRACE_LRC_H_
> +
> +#include <linux/tracepoint.h>
> +#include <linux/types.h>
> +
> +#include "xe_gt_types.h"
> +#include "xe_lrc.h"
> +#include "xe_lrc_types.h"
> +
> +#define __dev_name_lrc(lrc)	dev_name(gt_to_xe((lrc)->fence_ctx.gt)->drm.dev)
> +
> +TRACE_EVENT(xe_lrc_update_timestamp,
> +	    TP_PROTO(struct xe_lrc *lrc, uint32_t old),
> +	    TP_ARGS(lrc, old),
> +	    TP_STRUCT__entry(
> +		     __field(struct xe_lrc *, lrc)
> +		     __field(u32, old)
> +		     __field(u32, new)
> +		     __string(name, lrc->fence_ctx.name)
> +		     __string(device_id, __dev_name_lrc(lrc))
> +	    ),
> +
> +	    TP_fast_assign(
> +		   __entry->lrc	= lrc;
> +		   __entry->old = old;
> +		   __entry->new = lrc->ctx_timestamp;
> +		   __assign_str(name);
> +		   __assign_str(device_id);
> +		   ),
> +	    TP_printk("lrc=:%p lrc->name=%s old=%u new=%u device_id:%s",
> +		      __entry->lrc, __get_str(name),
> +		      __entry->old, __entry->new,
> +		      __get_str(device_id))
> +);
> +
> +#endif
> +
> +/* This part must be outside protection */
> +#undef TRACE_INCLUDE_PATH
> +#undef TRACE_INCLUDE_FILE
> +#define TRACE_INCLUDE_PATH ../../drivers/gpu/drm/xe
> +#define TRACE_INCLUDE_FILE xe_trace_lrc
> +#include <trace/define_trace.h>