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Subject: Re: [PATCH] drm/i915: Fix docbook descriptions for i915_cmd_parser
To:     intel-gfx <intel-gfx@lists.freedesktop.org>,
        Stephen Rothwell <sfr@canb.auug.org.au>,
        DRI <dri-devel@lists.freedesktop.org>,
        Dave Airlie <airlied@linux.ie>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
References: <20210421120353.544518-1-maarten.lankhorst@linux.intel.com>
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 <9ae96fa1-6c91-4ec1-422d-8e0a95251bb7@linux.intel.com>
 <YIExRAHQvZmgL5S+@phenom.ffwll.local>
From:   Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Message-ID: <20c93c9a-9aca-0057-23bf-463e7946e1c8@linux.intel.com>
Date:   Fri, 23 Apr 2021 12:42:45 +0200
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Op 22-04-2021 om 10:18 schreef Daniel Vetter:
> On Wed, Apr 21, 2021 at 04:39:10PM +0200, Maarten Lankhorst wrote:
>> Op 21-04-2021 om 16:32 schreef Daniel Vetter:
>>> On Wed, Apr 21, 2021 at 2:03 PM Maarten Lankhorst
>>> <maarten.lankhorst@linux.intel.com> wrote:
>>>> Fixes the following htmldocs warnings:
>>>> drivers/gpu/drm/i915/i915_cmd_parser.c:1420: warning: Excess function parameter 'trampoline' description in 'intel_engine_cmd_parser'
>>>> drivers/gpu/drm/i915/i915_cmd_parser.c:1420: warning: Function parameter or member 'jump_whitelist' not described in 'intel_engine_cmd_parser'
>>>> drivers/gpu/drm/i915/i915_cmd_parser.c:1420: warning: Function parameter or member 'shadow_map' not described in 'intel_engine_cmd_parser'
>>>> drivers/gpu/drm/i915/i915_cmd_parser.c:1420: warning: Function parameter or member 'batch_map' not described in 'intel_engine_cmd_parser'
>>>> drivers/gpu/drm/i915/i915_cmd_parser.c:1420: warning: Excess function parameter 'trampoline' description in 'intel_engine_cmd_parser'
>>>>
>>>> Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
>>>> Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
>>>> ---
>>>>  drivers/gpu/drm/i915/i915_cmd_parser.c | 16 +++++++++++++++-
>>>>  1 file changed, 15 insertions(+), 1 deletion(-)
>>>>
>>>> diff --git a/drivers/gpu/drm/i915/i915_cmd_parser.c b/drivers/gpu/drm/i915/i915_cmd_parser.c
>>>> index e6f1e93abbbb..afb9b7516999 100644
>>>> --- a/drivers/gpu/drm/i915/i915_cmd_parser.c
>>>> +++ b/drivers/gpu/drm/i915/i915_cmd_parser.c
>>>> @@ -1369,6 +1369,18 @@ static int check_bbstart(u32 *cmd, u32 offset, u32 length,
>>>>         return 0;
>>>>  }
>>>>
>>>> +/**
>>>> + * intel_engine_cmd_parser_alloc_jump_whitelist() - preallocate jump whitelist for intel_engine_cmd_parser()
>>>> + * @batch_length: length of the commands in batch_obj
>>>> + * @trampoline: Whether jump trampolines are used.
>>>> + *
>>>> + * Preallocates a jump whitelist for parsing the cmd buffer in intel_engine_cmd_parser().
>>>> + * This has to be preallocated, because the command parser runs in signaling context,
>>>> + * and may not allocate any memory.
>>>> + *
>>>> + * Return: NULL or pointer to a jump whitelist, or ERR_PTR() on failure. Use
>>>> + * IS_ERR() to check for errors. Must bre freed() with kfree().
>>> IS_ERR_OR_NULL or needs an actual bugfix in the code since we're not
>>> consistent. Also s/bre/be/
>> We're sort of consistent, NULL is a valid return code. IS_ERR is only on faliure. :)
> Maybe explain that and then Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
>
> Cheers, Daniel
>
>>> -Daniel
>>>
>>>> + */
>>>>  unsigned long *intel_engine_cmd_parser_alloc_jump_whitelist(u32 batch_length,
>>>>                                                             bool trampoline)
>>>>  {
>>>> @@ -1401,7 +1413,9 @@ unsigned long *intel_engine_cmd_parser_alloc_jump_whitelist(u32 batch_length,
>>>>   * @batch_offset: byte offset in the batch at which execution starts
>>>>   * @batch_length: length of the commands in batch_obj
>>>>   * @shadow: validated copy of the batch buffer in question
>>>> - * @trampoline: whether to emit a conditional trampoline at the end of the batch
>>>> + * @jump_whitelist: buffer preallocated with intel_engine_cmd_parser_alloc_jump_whitelist()
>>>> + * @shadow_map: mapping to @shadow vma
>>>> + * @batch_map: mapping to @batch vma
>>>>   *
>>>>   * Parses the specified batch buffer looking for privilege violations as
>>>>   * described in the overview.
>>>> --
>>>> 2.31.0
>>>>
Updated and pushed both, thanks. :)