From: dillon.minfei@gmail.com
To: mchehab@kernel.org, mchehab+huawei@kernel.org,
hverkuil-cisco@xs4all.nl, 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, Dillon Min <dillon.minfei@gmail.com>
Subject: [PATCH 6/7] media: v4l2-mem2mem: add v4l2_m2m_get_unmapped_area for no-mmu platform
Date: Thu, 20 May 2021 19:05:26 +0800 [thread overview]
Message-ID: <1621508727-24486-7-git-send-email-dillon.minfei@gmail.com> (raw)
In-Reply-To: <1621508727-24486-1-git-send-email-dillon.minfei@gmail.com>
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
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
*
--
2.7.4
next prev parent reply other threads:[~2021-05-20 12:18 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 ` dillon.minfei [this message]
2021-06-17 9:58 ` [PATCH 6/7] media: v4l2-mem2mem: add v4l2_m2m_get_unmapped_area for no-mmu platform Hans Verkuil
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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