From: Hans Verkuil <hverkuil-cisco@xs4all.nl>
To: dillon.minfei@gmail.com, mchehab@kernel.org,
mchehab+huawei@kernel.org, ezequiel@collabora.com,
gnurou@gmail.com, pihsun@chromium.org, mcoquelin.stm32@gmail.com,
alexandre.torgue@foss.st.com, mturquette@baylibre.com,
sboyd@kernel.org, robh+dt@kernel.org
Cc: patrice.chotard@foss.st.com, hugues.fruchet@foss.st.com,
linux-media@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-stm32@st-md-mailman.stormreply.com,
linux-arm-kernel@lists.infradead.org, linux-clk@vger.kernel.org,
devicetree@vger.kernel.org
Subject: Re: [PATCH 6/7] media: v4l2-mem2mem: add v4l2_m2m_get_unmapped_area for no-mmu platform
Date: Thu, 17 Jun 2021 11:58:38 +0200 [thread overview]
Message-ID: <d9d2a893-a159-1681-866f-e905609ce9d0@xs4all.nl> (raw)
In-Reply-To: <1621508727-24486-7-git-send-email-dillon.minfei@gmail.com>
On 20/05/2021 13:05, dillon.minfei@gmail.com wrote:
> From: Dillon Min <dillon.minfei@gmail.com>
>
> For platforms without MMU the m2m provides a helper method
> v4l2_m2m_get_unmapped_area(), The mmap() routines will call
> this to get a proposed address for the mapping.
>
> More detailed information about get_unmapped_area can be found in
> Documentation/nommu-mmap.txt
I'm getting checkpatch.pl --strict warnings:
CHECK: Alignment should match open parenthesis
#31: FILE: drivers/media/v4l2-core/v4l2-mem2mem.c:971:
+unsigned long v4l2_m2m_get_unmapped_area(struct file *file, unsigned long addr,
+ unsigned long len, unsigned long pgoff, unsigned long flags)
CHECK: Alignment should match open parenthesis
#62: FILE: include/media/v4l2-mem2mem.h:500:
+unsigned long v4l2_m2m_get_unmapped_area(struct file *file, unsigned long addr,
+ unsigned long len, unsigned long pgoff, unsigned long flags);
Regards,
Hans
>
> Signed-off-by: Dillon Min <dillon.minfei@gmail.com>
> ---
> drivers/media/v4l2-core/v4l2-mem2mem.c | 20 ++++++++++++++++++++
> include/media/v4l2-mem2mem.h | 4 ++++
> 2 files changed, 24 insertions(+)
>
> diff --git a/drivers/media/v4l2-core/v4l2-mem2mem.c b/drivers/media/v4l2-core/v4l2-mem2mem.c
> index e7f4bf5bc8dd..f82a18ecab2f 100644
> --- a/drivers/media/v4l2-core/v4l2-mem2mem.c
> +++ b/drivers/media/v4l2-core/v4l2-mem2mem.c
> @@ -966,6 +966,26 @@ int v4l2_m2m_mmap(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
> }
> EXPORT_SYMBOL(v4l2_m2m_mmap);
>
> +#ifndef CONFIG_MMU
> +unsigned long v4l2_m2m_get_unmapped_area(struct file *file, unsigned long addr,
> + unsigned long len, unsigned long pgoff, unsigned long flags)
> +{
> + struct v4l2_fh *fh = file->private_data;
> + unsigned long offset = pgoff << PAGE_SHIFT;
> + struct vb2_queue *vq;
> +
> + if (offset < DST_QUEUE_OFF_BASE) {
> + vq = v4l2_m2m_get_src_vq(fh->m2m_ctx);
> + } else {
> + vq = v4l2_m2m_get_dst_vq(fh->m2m_ctx);
> + pgoff -= (DST_QUEUE_OFF_BASE >> PAGE_SHIFT);
> + }
> +
> + return vb2_get_unmapped_area(vq, addr, len, pgoff, flags);
> +}
> +EXPORT_SYMBOL_GPL(v4l2_m2m_get_unmapped_area);
> +#endif
> +
> #if defined(CONFIG_MEDIA_CONTROLLER)
> void v4l2_m2m_unregister_media_controller(struct v4l2_m2m_dev *m2m_dev)
> {
> diff --git a/include/media/v4l2-mem2mem.h b/include/media/v4l2-mem2mem.h
> index 5a91b548ecc0..91269227c265 100644
> --- a/include/media/v4l2-mem2mem.h
> +++ b/include/media/v4l2-mem2mem.h
> @@ -495,6 +495,10 @@ __poll_t v4l2_m2m_poll(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
> int v4l2_m2m_mmap(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
> struct vm_area_struct *vma);
>
> +#ifndef CONFIG_MMU
> +unsigned long v4l2_m2m_get_unmapped_area(struct file *file, unsigned long addr,
> + unsigned long len, unsigned long pgoff, unsigned long flags);
> +#endif
> /**
> * v4l2_m2m_init() - initialize per-driver m2m data
> *
>
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next prev parent reply other threads:[~2021-06-17 10:00 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-20 11:05 [PATCH 0/7] Add support for DMA2D of STMicroelectronics STM32 SoC series dillon.minfei
2021-05-20 11:05 ` [PATCH 1/7] media: admin-guide: add stm32-dma2d description dillon.minfei
2021-06-17 9:56 ` Hans Verkuil
2021-06-17 10:14 ` Dillon Min
2021-05-20 11:05 ` [PATCH 2/7] media: dt-bindings: media: add document for STM32 DMA2D bindings dillon.minfei
2021-05-21 2:03 ` Rob Herring
2021-05-20 11:05 ` [PATCH 3/7] clk: stm32: Fix ltdc's clock turn off by clk_disable_unused() after kernel startup dillon.minfei
2021-06-17 9:57 ` Hans Verkuil
2021-06-17 10:21 ` Dillon Min
2021-05-20 11:05 ` [PATCH 4/7] ARM: dts: stm32: Enable DMA2D support on STM32F429 MCU dillon.minfei
2021-05-20 11:05 ` [PATCH 5/7] ARM: dts: stm32: Enable DMA2D on STM32F469-DISCO board dillon.minfei
2021-05-20 11:05 ` [PATCH 6/7] media: v4l2-mem2mem: add v4l2_m2m_get_unmapped_area for no-mmu platform dillon.minfei
2021-06-17 9:58 ` Hans Verkuil [this message]
2021-06-17 10:40 ` Dillon Min
2021-05-20 11:05 ` [PATCH 7/7] media: stm32-dma2d: STM32 DMA2D driver dillon.minfei
2021-06-17 10:18 ` Hans Verkuil
2021-06-17 10:56 ` Dillon Min
2021-06-17 11:23 ` Hans Verkuil
2021-06-09 13:46 ` [PATCH 0/7] Add support for DMA2D of STMicroelectronics STM32 SoC series Dillon Min
2021-06-17 9:54 ` Hans Verkuil
2021-06-17 11:01 ` Dillon Min
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