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Date:   Fri, 16 Sep 2022 17:03:27 +0300
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Subject: Re: [Intel-gfx] [PATCH v3 01/37] drm/i915: fix kernel-doc trivial
 warnings on i915/*.[ch] files
Content-Language: en-US
To:     Mauro Carvalho Chehab <mchehab@kernel.org>
CC:     David Airlie <airlied@linux.ie>, <intel-gfx@lists.freedesktop.org>,
        <linux-kernel@vger.kernel.org>, <dri-devel@lists.freedesktop.org>,
        "Daniel Vetter" <daniel@ffwll.ch>,
        Rodrigo Vivi <rodrigo.vivi@intel.com>
References: <cover.1662708705.git.mchehab@kernel.org>
 <752ce443ea141601cf59a1ad8a5130deed2feb4f.1662708705.git.mchehab@kernel.org>
From:   Gwan-gyeong Mun <gwan-gyeong.mun@intel.com>
In-Reply-To: <752ce443ea141601cf59a1ad8a5130deed2feb4f.1662708705.git.mchehab@kernel.org>
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On 9/9/22 10:34 AM, Mauro Carvalho Chehab wrote:
> There are several trivial warnings there, due to trivial things:
> 	- lack of function name at the kerneldoc markup;
> 	- renamed functions;
> 	- wrong parameter syntax.
> 
> Fix such warnings:
> 	drivers/gpu/drm/i915/i915_active.h:66: warning: Function parameter or member 'active' not described in '__i915_active_fence_init'
> 	drivers/gpu/drm/i915/i915_active.h:66: warning: Function parameter or member 'fence' not described in '__i915_active_fence_init'
> 	drivers/gpu/drm/i915/i915_active.h:66: warning: Function parameter or member 'fn' not described in '__i915_active_fence_init'
> 	drivers/gpu/drm/i915/i915_active.h:89: warning: Function parameter or member 'active' not described in 'i915_active_fence_set'
> 	drivers/gpu/drm/i915/i915_active.h:89: warning: Function parameter or member 'rq' not described in 'i915_active_fence_set'
> 	drivers/gpu/drm/i915/i915_active.h:102: warning: Function parameter or member 'active' not described in 'i915_active_fence_get'
> 	drivers/gpu/drm/i915/i915_active.h:122: warning: Function parameter or member 'active' not described in 'i915_active_fence_isset'
> 	drivers/gpu/drm/i915/i915_gem.c:443: warning: This comment starts with '/**', but isn't a kernel-doc comment. Refer Documentation/doc-guide/kernel-doc.rst
> 	 * Reads data from the object referenced by handle.
> 	drivers/gpu/drm/i915/i915_gem.c:532: warning: This comment starts with '/**', but isn't a kernel-doc comment. Refer Documentation/doc-guide/kernel-doc.rst
> 	 * This is the fast pwrite path, where we copy the data directly from the
> 	drivers/gpu/drm/i915/i915_gem.c:717: warning: This comment starts with '/**', but isn't a kernel-doc comment. Refer Documentation/doc-guide/kernel-doc.rst
> 	 * Writes data to the object referenced by handle.
> 	drivers/gpu/drm/i915/i915_gem.c:802: warning: This comment starts with '/**', but isn't a kernel-doc comment. Refer Documentation/doc-guide/kernel-doc.rst
> 	 * Called when user space has done writes to this buffer
> 	drivers/gpu/drm/i915/i915_pmu.h:22: warning: cannot understand function prototype: 'enum i915_pmu_tracked_events '
> 	drivers/gpu/drm/i915/i915_pmu.h:33: warning: cannot understand function prototype: 'enum '
> 	drivers/gpu/drm/i915/i915_pmu.h:42: warning: This comment starts with '/**', but isn't a kernel-doc comment. Refer Documentation/doc-guide/kernel-doc.rst
> 	 * How many different events we track in the global PMU mask.
> 	drivers/gpu/drm/i915/i915_request.h:177: warning: This comment starts with '/**', but isn't a kernel-doc comment. Refer Documentation/doc-guide/kernel-doc.rst
> 	 * Request queue structure.
> 	drivers/gpu/drm/i915/i915_request.h:473: warning: This comment starts with '/**', but isn't a kernel-doc comment. Refer Documentation/doc-guide/kernel-doc.rst
> 	 * Returns true if seq1 is later than seq2.
> 	drivers/gpu/drm/i915/i915_scatterlist.c:63: warning: Function parameter or member 'size' not described in 'i915_refct_sgt_init'
> 	drivers/gpu/drm/i915/i915_scatterlist.h:153: warning: Incorrect use of kernel-doc format:          * release() - Free the memory of the struct i915_refct_sgt
> 	drivers/gpu/drm/i915/i915_scatterlist.h:157: warning: Function parameter or member 'release' not described in 'i915_refct_sgt_ops'
> 	drivers/gpu/drm/i915/i915_scatterlist.h:180: warning: Function parameter or member 'rsgt' not described in 'i915_refct_sgt_put'
> 	drivers/gpu/drm/i915/i915_scatterlist.h:191: warning: Function parameter or member 'rsgt' not described in 'i915_refct_sgt_get'
> 	drivers/gpu/drm/i915/i915_scatterlist.h:207: warning: Function parameter or member 'rsgt' not described in '__i915_refct_sgt_init'
> 	drivers/gpu/drm/i915/i915_utils.h:291: warning: Function parameter or member 'OP' not described in '__wait_for'
> 	drivers/gpu/drm/i915/i915_utils.h:291: warning: Function parameter or member 'COND' not described in '__wait_for'
> 	drivers/gpu/drm/i915/i915_utils.h:291: warning: Function parameter or member 'US' not described in '__wait_for'
> 	drivers/gpu/drm/i915/i915_utils.h:291: warning: Function parameter or member 'Wmin' not described in '__wait_for'
> 	drivers/gpu/drm/i915/i915_utils.h:291: warning: Function parameter or member 'Wmax' not described in '__wait_for'
> 	drivers/gpu/drm/i915/i915_vma_resource.h:88: warning: Incorrect use of kernel-doc format:          * struct i915_vma_bindinfo - Information needed for async bind
> 	drivers/gpu/drm/i915/i915_vma_resource.h:123: warning: Function parameter or member 'bi' not described in 'i915_vma_resource'
> 
> Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
> Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
> ---
> 
> To avoid mailbombing on a large number of people, only mailing lists were C/C on the cover.
> See [PATCH v3 00/37] at: https://lore.kernel.org/all/cover.1662708705.git.mchehab@kernel.org/
> 
>   drivers/gpu/drm/i915/i915_active.h       | 14 +++++++-------
>   drivers/gpu/drm/i915/i915_gem.c          | 10 ++++++----
>   drivers/gpu/drm/i915/i915_pmu.h          |  6 +++---
>   drivers/gpu/drm/i915/i915_request.h      |  4 ++--
>   drivers/gpu/drm/i915/i915_scatterlist.c  |  2 +-
>   drivers/gpu/drm/i915/i915_scatterlist.h  | 10 +++++-----
>   drivers/gpu/drm/i915/i915_utils.h        |  2 +-
>   drivers/gpu/drm/i915/i915_vma_resource.h |  2 +-
>   8 files changed, 26 insertions(+), 24 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/i915_active.h b/drivers/gpu/drm/i915/i915_active.h
> index 7eb44132183a..77c676ecc263 100644
> --- a/drivers/gpu/drm/i915/i915_active.h
> +++ b/drivers/gpu/drm/i915/i915_active.h
> @@ -49,9 +49,9 @@ void i915_active_noop(struct dma_fence *fence, struct dma_fence_cb *cb);
>   
>   /**
>    * __i915_active_fence_init - prepares the activity tracker for use
> - * @active - the active tracker
> - * @fence - initial fence to track, can be NULL
> - * @func - a callback when then the tracker is retired (becomes idle),
> + * @active: the active tracker
> + * @fence: initial fence to track, can be NULL
> + * @fn: a callback when then the tracker is retired (becomes idle),
>    *         can be NULL
>    *
>    * i915_active_fence_init() prepares the embedded @active struct for use as
> @@ -77,8 +77,8 @@ __i915_active_fence_set(struct i915_active_fence *active,
>   
>   /**
>    * i915_active_fence_set - updates the tracker to watch the current fence
> - * @active - the active tracker
> - * @rq - the request to watch
> + * @active: the active tracker
> + * @rq: the request to watch
>    *
>    * i915_active_fence_set() watches the given @rq for completion. While
>    * that @rq is busy, the @active reports busy. When that @rq is signaled
> @@ -89,7 +89,7 @@ i915_active_fence_set(struct i915_active_fence *active,
>   		      struct i915_request *rq);
>   /**
>    * i915_active_fence_get - return a reference to the active fence
> - * @active - the active tracker
> + * @active: the active tracker
>    *
>    * i915_active_fence_get() returns a reference to the active fence,
>    * or NULL if the active tracker is idle. The reference is obtained under RCU,
> @@ -111,7 +111,7 @@ i915_active_fence_get(struct i915_active_fence *active)
>   
>   /**
>    * i915_active_fence_isset - report whether the active tracker is assigned
> - * @active - the active tracker
> + * @active: the active tracker
>    *
>    * i915_active_fence_isset() returns true if the active tracker is currently
>    * assigned to a fence. Due to the lazy retiring, that fence may be idle
> diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
> index bae857d5221d..f68fa0732363 100644
> --- a/drivers/gpu/drm/i915/i915_gem.c
> +++ b/drivers/gpu/drm/i915/i915_gem.c
> @@ -439,7 +439,7 @@ i915_gem_gtt_pread(struct drm_i915_gem_object *obj,
>   }
>   
>   /**
> - * Reads data from the object referenced by handle.
> + * i915_gem_pread_ioctl - Reads data from the object referenced by handle.
>    * @dev: drm device pointer
>    * @data: ioctl data blob
>    * @file: drm file pointer
> @@ -528,7 +528,8 @@ ggtt_write(struct io_mapping *mapping,
>   }
>   
>   /**
> - * This is the fast pwrite path, where we copy the data directly from the
> + * i915_gem_gtt_pwrite_fast - This is the fast pwrite path, where we copy
> + *	the data directly from the
>    * user into the GTT, uncached.
>    * @obj: i915 GEM object
>    * @args: pwrite arguments structure
> @@ -713,7 +714,7 @@ i915_gem_shmem_pwrite(struct drm_i915_gem_object *obj,
>   }
>   
>   /**
> - * Writes data to the object referenced by handle.
> + * i915_gem_pwrite_ioctl - Writes data to the object referenced by handle.
>    * @dev: drm device
>    * @data: ioctl data blob
>    * @file: drm file
> @@ -798,7 +799,8 @@ i915_gem_pwrite_ioctl(struct drm_device *dev, void *data,
>   }
>   
>   /**
> - * Called when user space has done writes to this buffer
> + * i915_gem_sw_finish_ioctl - Called when user space has done writes to
> + *	this buffer
As per this link[1], the brief description does not have a limitation to 
match the indentation when explained over multiple lines, unlike 
function parameters.

[1] 
https://docs.kernel.org/doc-guide/kernel-doc.html#function-documentation

Therefore if you look at the function brief description over several 
lines in i915 and drm,

One of the drm apis, drm_gem_lock_reservations(), is used without 
indentation in the form below,
/**
  * drm_gem_lock_reservations - Sets up the ww context and acquires
  * the lock on an array of GEM objects.

In i915_perf.c, indentation is set as follows.

/**
  * gen8_append_oa_reports - Copies all buffered OA reports into
  *			    userspace read() buffer.

...

/**
  * gen7_append_oa_reports - Copies all buffered OA reports into
  *			    userspace read() buffer.

If there is no problem when using the same form as 
gen8_append_oa_reports when generating kernel-doc, it seems to be 
indented to match the existing i915 style. However, if there is a 
problem, I think you need to remove the indented part of the i915 code 
like the drm apis.

except i915_gem_sw_finish_ioctl  i915_gem_gtt_pwrite_fast parts, the 
rest of the parts look good to me.

Reviewed-by: Gwan-gyeong Mun <gwan-gyeong.mun@intel.com>
>    * @dev: drm device
>    * @data: ioctl data blob
>    * @file: drm file
> diff --git a/drivers/gpu/drm/i915/i915_pmu.h b/drivers/gpu/drm/i915/i915_pmu.h
> index 449057648f39..c30f43319a78 100644
> --- a/drivers/gpu/drm/i915/i915_pmu.h
> +++ b/drivers/gpu/drm/i915/i915_pmu.h
> @@ -14,7 +14,7 @@
>   
>   struct drm_i915_private;
>   
> -/**
> +/*
>    * Non-engine events that we need to track enabled-disabled transition and
>    * current state.
>    */
> @@ -25,7 +25,7 @@ enum i915_pmu_tracked_events {
>   	__I915_PMU_TRACKED_EVENT_COUNT, /* count marker */
>   };
>   
> -/**
> +/*
>    * Slots used from the sampling timer (non-engine events) with some extras for
>    * convenience.
>    */
> @@ -37,7 +37,7 @@ enum {
>   	__I915_NUM_PMU_SAMPLERS
>   };
>   
> -/**
> +/*
>    * How many different events we track in the global PMU mask.
>    *
>    * It is also used to know to needed number of event reference counters.
> diff --git a/drivers/gpu/drm/i915/i915_request.h b/drivers/gpu/drm/i915/i915_request.h
> index 47041ec68df8..66d6dee98525 100644
> --- a/drivers/gpu/drm/i915/i915_request.h
> +++ b/drivers/gpu/drm/i915/i915_request.h
> @@ -172,7 +172,7 @@ enum {
>   	I915_FENCE_FLAG_COMPOSITE,
>   };
>   
> -/**
> +/*
>    * Request queue structure.
>    *
>    * The request queue allows us to note sequence numbers that have been emitted
> @@ -468,7 +468,7 @@ i915_request_has_initial_breadcrumb(const struct i915_request *rq)
>   	return test_bit(I915_FENCE_FLAG_INITIAL_BREADCRUMB, &rq->fence.flags);
>   }
>   
> -/**
> +/*
>    * Returns true if seq1 is later than seq2.
>    */
>   static inline bool i915_seqno_passed(u32 seq1, u32 seq2)
> diff --git a/drivers/gpu/drm/i915/i915_scatterlist.c b/drivers/gpu/drm/i915/i915_scatterlist.c
> index dcc081874ec8..f664c1ce02cf 100644
> --- a/drivers/gpu/drm/i915/i915_scatterlist.c
> +++ b/drivers/gpu/drm/i915/i915_scatterlist.c
> @@ -56,7 +56,7 @@ static const struct i915_refct_sgt_ops rsgt_ops = {
>   /**
>    * i915_refct_sgt_init - Initialize a struct i915_refct_sgt with default ops
>    * @rsgt: The struct i915_refct_sgt to initialize.
> - * size: The size of the underlying memory buffer.
> + * @size: The size of the underlying memory buffer.
>    */
>   void i915_refct_sgt_init(struct i915_refct_sgt *rsgt, size_t size)
>   {
> diff --git a/drivers/gpu/drm/i915/i915_scatterlist.h b/drivers/gpu/drm/i915/i915_scatterlist.h
> index 9ddb3e743a3e..79b70ae2e766 100644
> --- a/drivers/gpu/drm/i915/i915_scatterlist.h
> +++ b/drivers/gpu/drm/i915/i915_scatterlist.h
> @@ -149,7 +149,7 @@ bool i915_sg_trim(struct sg_table *orig_st);
>    */
>   struct i915_refct_sgt_ops {
>   	/**
> -	 * release() - Free the memory of the struct i915_refct_sgt
> +	 * @release: Free the memory of the struct i915_refct_sgt
>   	 * @ref: struct kref that is embedded in the struct i915_refct_sgt
>   	 */
>   	void (*release)(struct kref *ref);
> @@ -159,7 +159,7 @@ struct i915_refct_sgt_ops {
>    * struct i915_refct_sgt - A refcounted scatter-gather table
>    * @kref: struct kref for refcounting
>    * @table: struct sg_table holding the scatter-gather table itself. Note that
> - * @table->sgl = NULL can be used to determine whether a scatter-gather table
> + * @table->sgl == NULL can be used to determine whether a scatter-gather table
>    * is present or not.
>    * @size: The size in bytes of the underlying memory buffer
>    * @ops: The operations structure.
> @@ -173,7 +173,7 @@ struct i915_refct_sgt {
>   
>   /**
>    * i915_refct_sgt_put - Put a refcounted sg-table
> - * @rsgt the struct i915_refct_sgt to put.
> + * @rsgt: the struct i915_refct_sgt to put.
>    */
>   static inline void i915_refct_sgt_put(struct i915_refct_sgt *rsgt)
>   {
> @@ -183,7 +183,7 @@ static inline void i915_refct_sgt_put(struct i915_refct_sgt *rsgt)
>   
>   /**
>    * i915_refct_sgt_get - Get a refcounted sg-table
> - * @rsgt the struct i915_refct_sgt to get.
> + * @rsgt: the struct i915_refct_sgt to get.
>    */
>   static inline struct i915_refct_sgt *
>   i915_refct_sgt_get(struct i915_refct_sgt *rsgt)
> @@ -195,7 +195,7 @@ i915_refct_sgt_get(struct i915_refct_sgt *rsgt)
>   /**
>    * __i915_refct_sgt_init - Initialize a refcounted sg-list with a custom
>    * operations structure
> - * @rsgt The struct i915_refct_sgt to initialize.
> + * @rsgt: The struct i915_refct_sgt to initialize.
>    * @size: Size in bytes of the underlying memory buffer.
>    * @ops: A customized operations structure in case the refcounted sg-list
>    * is embedded into another structure.
> diff --git a/drivers/gpu/drm/i915/i915_utils.h b/drivers/gpu/drm/i915/i915_utils.h
> index 6c14d13364bf..85994298a74e 100644
> --- a/drivers/gpu/drm/i915/i915_utils.h
> +++ b/drivers/gpu/drm/i915/i915_utils.h
> @@ -256,7 +256,7 @@ wait_remaining_ms_from_jiffies(unsigned long timestamp_jiffies, int to_wait_ms)
>   	}
>   }
>   
> -/**
> +/*
>    * __wait_for - magic wait macro
>    *
>    * Macro to help avoid open coding check/wait/timeout patterns. Note that it's
> diff --git a/drivers/gpu/drm/i915/i915_vma_resource.h b/drivers/gpu/drm/i915/i915_vma_resource.h
> index 06923d1816e7..e155f6f7af6f 100644
> --- a/drivers/gpu/drm/i915/i915_vma_resource.h
> +++ b/drivers/gpu/drm/i915/i915_vma_resource.h
> @@ -85,7 +85,7 @@ struct i915_vma_resource {
>   	intel_wakeref_t wakeref;
>   
>   	/**
> -	 * struct i915_vma_bindinfo - Information needed for async bind
> +	 * @bi: Information needed for async bind
>   	 * only but that can be dropped after the bind has taken place.
>   	 * Consider making this a separate argument to the bind_vma
>   	 * op, coalescing with other arguments like vm, stash, cache_level