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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 v2 6/9] media: v4l2-mem2mem: add v4l2_m2m_get_unmapped_area for no-mmu platform
Date: Thu, 15 Jul 2021 17:24:15 +0800	[thread overview]
Message-ID: <1626341068-20253-7-git-send-email-dillon.minfei@gmail.com> (raw)
In-Reply-To: <1626341068-20253-1-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>
---
v2: fix the warrnings from checkpatch.pl --strict, thanks Hans

 drivers/media/v4l2-core/v4l2-mem2mem.c | 21 +++++++++++++++++++++
 include/media/v4l2-mem2mem.h           |  5 +++++
 2 files changed, 26 insertions(+)

diff --git a/drivers/media/v4l2-core/v4l2-mem2mem.c b/drivers/media/v4l2-core/v4l2-mem2mem.c
index e7f4bf5bc8dd..e2654b422334 100644
--- a/drivers/media/v4l2-core/v4l2-mem2mem.c
+++ b/drivers/media/v4l2-core/v4l2-mem2mem.c
@@ -966,6 +966,27 @@ 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..fdbd5257e020 100644
--- a/include/media/v4l2-mem2mem.h
+++ b/include/media/v4l2-mem2mem.h
@@ -495,6 +495,11 @@ __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


  parent reply	other threads:[~2021-07-15  9:25 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-15  9:24 [PATCH v2 0/9] Add support for DMA2D of STMicroelectronics STM32 Soc series dillon.minfei
2021-07-15  9:24 ` [PATCH v2 1/9] media: admin-guide: add stm32-dma2d description dillon.minfei
2021-07-15  9:24 ` [PATCH v2 2/9] media: dt-bindings: media: add document for STM32 DMA2d bindings dillon.minfei
2021-07-15  9:24 ` [PATCH v2 3/9] clk: stm32: Fix ltdc's clock turn off by clk_disable_unused() after kernel startup dillon.minfei
2021-07-15  9:24 ` [PATCH v2 4/9] ARM: dts: stm32: Enable DMA2D support on STM32F429 MCU dillon.minfei
2021-07-15  9:24 ` [PATCH v2 5/9] ARM: dts: stm32: Enable DMA2D on STM32F469-DISCO board dillon.minfei
2021-07-15  9:24 ` dillon.minfei [this message]
2021-07-15  9:24 ` [PATCH v2 7/9] media: docs: add doc for the stm32 dma2d driver dillon.minfei
2021-07-15  9:24 ` [PATCH v2 8/9] media: v4l: uapi: Add user control base for stm32 dma2d controls dillon.minfei
2021-07-15  9:24 ` [PATCH v2 9/9] media: stm32-dma2d: STM32 DMA2D driver dillon.minfei
2021-07-15  9:24 ` [PATCH v2 0/9] Add support for DMA2D of STMicroelectronics STM32 Soc series dillon.minfei
2021-07-15  9:24 ` [PATCH v2 1/9] media: admin-guide: add stm32-dma2d description dillon.minfei
2021-07-15  9:24 ` [PATCH v2 2/9] media: dt-bindings: media: add document for STM32 DMA2d bindings dillon.minfei
2021-07-15  9:24 ` [PATCH v2 3/9] clk: stm32: Fix ltdc's clock turn off by clk_disable_unused() after kernel startup dillon.minfei
2021-07-15  9:24 ` [PATCH v2 4/9] ARM: dts: stm32: Enable DMA2D support on STM32F429 MCU dillon.minfei
2021-07-15  9:24 ` [PATCH v2 5/9] ARM: dts: stm32: Enable DMA2D on STM32F469-DISCO board dillon.minfei
2021-07-15  9:24 ` [PATCH v2 6/9] media: v4l2-mem2mem: add v4l2_m2m_get_unmapped_area for no-mmu platform dillon.minfei
2021-07-15  9:24 ` [PATCH v2 7/9] media: docs: add doc for the stm32 dma2d driver dillon.minfei
2021-08-09  9:15   ` Hans Verkuil
2021-08-10  8:52     ` Dillon Min
2021-07-15  9:24 ` [PATCH v2 8/9] media: v4l: uapi: Add user control base for stm32 dma2d controls dillon.minfei
2021-07-15  9:24 ` [PATCH v2 9/9] media: stm32-dma2d: STM32 DMA2D driver dillon.minfei
2021-08-09  9:09   ` Hans Verkuil
2021-08-10  8:51     ` Dillon Min
2021-08-05  8:59 ` [PATCH v2 0/9] Add support for DMA2D of STMicroelectronics STM32 Soc series Dillon Min

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