From: Hans Verkuil <hverkuil@xs4all.nl>
To: Sergey Senozhatsky <senozhatsky@chromium.org>
Cc: Hans Verkuil <hans.verkuil@cisco.com>,
Tomasz Figa <tfiga@chromium.org>,
Mauro Carvalho Chehab <mchehab@kernel.org>,
Kyungmin Park <kyungmin.park@samsung.com>,
Marek Szyprowski <m.szyprowski@samsung.com>,
Sakari Ailus <sakari.ailus@iki.fi>,
Laurent Pinchart <laurent.pinchart@ideasonboard.com>,
Pawel Osciak <posciak@chromium.org>,
linux-media@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCHv4 10/11] videobuf2: add begin/end cpu_access callbacks to dma-sg
Date: Sat, 7 Mar 2020 10:32:42 +0100 [thread overview]
Message-ID: <8150bc6c-f6a4-fa2c-4e2e-552dcb168df0@xs4all.nl> (raw)
In-Reply-To: <20200307052628.GB176460@google.com>
On 07/03/2020 06:26, Sergey Senozhatsky wrote:
> On (20/03/06 15:04), Hans Verkuil wrote:
> [..]
>>> + /*
>>> + * NOTE: dma-sg allocates memory using the page allocator directly, so
>>> + * there is no memory consistency guarantee, hence dma-sg ignores DMA
>>> + * attributes passed from the upper layer. That means that
>>> + * V4L2_FLAG_MEMORY_NON_CONSISTENT has no effect on dma-sg buffers.
>>> + */
>>> buf->pages = kvmalloc_array(buf->num_pages, sizeof(struct page *),
>>> GFP_KERNEL | __GFP_ZERO);
>>> if (!buf->pages)
>>> @@ -470,6 +476,26 @@ static void vb2_dma_sg_dmabuf_ops_release(struct dma_buf *dbuf)
>>> vb2_dma_sg_put(dbuf->priv);
>>> }
>>>
>>> +static int vb2_dma_sg_dmabuf_ops_begin_cpu_access(struct dma_buf *dbuf,
>>> + enum dma_data_direction direction)
>>
>> I suggest you use this style to avoid checkpatch warnings:
>>
>> static int
>> vb2_dma_sg_dmabuf_ops_begin_cpu_access(struct dma_buf *dbuf,
>> enum dma_data_direction direction)
>
> OK, will do.
>
> Just for information, my checkpatch doesn't warn me:
>
> $ ./scripts/checkpatch.pl outgoing/0010-videobuf2-add-begin-end-cpu_access-callbacks-to-dma-.patch
We use the --strict option to checkpatch.
Regards,
Hans
> total: 0 errors, 0 warnings, 46 lines checked
>
> outgoing/0010-videobuf2-add-begin-end-cpu_access-callbacks-to-dma-.patch has no obvious style problems and is ready for submission.
>
> -ss
>
next prev parent reply other threads:[~2020-03-07 9:32 UTC|newest]
Thread overview: 50+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-02 4:12 [PATCHv4 00/11] Implement V4L2_BUF_FLAG_NO_CACHE_* flags Sergey Senozhatsky
2020-03-02 4:12 ` [PATCHv4 01/11] videobuf2: add cache management members Sergey Senozhatsky
2020-03-06 13:57 ` Hans Verkuil
2020-03-07 5:22 ` Sergey Senozhatsky
2020-03-07 9:46 ` Sergey Senozhatsky
2020-03-07 10:10 ` Hans Verkuil
2020-03-07 11:28 ` Sergey Senozhatsky
2020-03-07 11:47 ` Hans Verkuil
2020-03-09 3:27 ` Sergey Senozhatsky
2020-03-09 3:44 ` Sergey Senozhatsky
2020-03-09 7:21 ` Hans Verkuil
2020-03-09 7:25 ` Sergey Senozhatsky
2020-03-09 7:28 ` Hans Verkuil
2020-03-09 7:39 ` Sergey Senozhatsky
2020-03-09 8:58 ` Tomasz Figa
2020-03-09 9:08 ` Sergey Senozhatsky
2020-03-09 9:17 ` Tomasz Figa
2020-03-09 9:29 ` Sergey Senozhatsky
2020-03-09 4:03 ` Sergey Senozhatsky
2020-03-09 7:17 ` Hans Verkuil
2020-03-02 4:12 ` [PATCHv4 02/11] videobuf2: handle V4L2 buffer cache flags Sergey Senozhatsky
2020-03-02 4:12 ` [PATCHv4 03/11] videobuf2: add V4L2_FLAG_MEMORY_NON_CONSISTENT flag Sergey Senozhatsky
2020-03-06 13:58 ` Hans Verkuil
2020-03-07 8:09 ` Sergey Senozhatsky
2020-03-02 4:12 ` [PATCHv4 04/11] videobuf2: add queue memory consistency parameter Sergey Senozhatsky
2020-03-06 14:04 ` Hans Verkuil
2020-03-07 7:50 ` Sergey Senozhatsky
2020-03-07 10:03 ` Hans Verkuil
2020-03-20 13:46 ` Dafna Hirschfeld
2020-03-24 2:39 ` Sergey Senozhatsky
2020-03-24 10:17 ` Ezequiel Garcia
2020-03-25 2:32 ` Sergey Senozhatsky
2020-03-27 11:27 ` Tomasz Figa
2020-03-02 4:12 ` [PATCHv4 05/11] videobuf2: handle V4L2_FLAG_MEMORY_NON_CONSISTENT flag Sergey Senozhatsky
2020-03-06 15:30 ` Hans Verkuil
2020-03-07 7:51 ` Sergey Senozhatsky
2020-03-07 9:38 ` Sergey Senozhatsky
2020-03-07 10:05 ` Hans Verkuil
2020-03-02 4:12 ` [PATCHv4 06/11] videobuf2: factor out planes prepare/finish functions Sergey Senozhatsky
2020-03-02 4:12 ` [PATCHv4 07/11] videobuf2: do not sync caches when we are allowed not to Sergey Senozhatsky
2020-03-02 4:12 ` [PATCHv4 08/11] videobuf2: check ->synced flag in prepare() and finish() Sergey Senozhatsky
2020-03-02 4:12 ` [PATCHv4 09/11] videobuf2: add begin/end cpu_access callbacks to dma-contig Sergey Senozhatsky
2020-03-02 4:12 ` [PATCHv4 10/11] videobuf2: add begin/end cpu_access callbacks to dma-sg Sergey Senozhatsky
2020-03-06 14:04 ` Hans Verkuil
2020-03-07 5:26 ` Sergey Senozhatsky
2020-03-07 9:32 ` Hans Verkuil [this message]
2020-03-07 9:39 ` Sergey Senozhatsky
2020-03-02 4:12 ` [PATCHv4 11/11] videobuf2: don't test db_attach in dma-contig prepare and finish Sergey Senozhatsky
2020-03-06 14:18 ` [PATCHv4 00/11] Implement V4L2_BUF_FLAG_NO_CACHE_* flags Hans Verkuil
2020-03-07 8:08 ` Sergey Senozhatsky
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