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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,
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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 17:24:25 +0800
Message-Id: <1626341068-20253-17-git-send-email-dillon.minfei@gmail.com>
In-Reply-To: <1626341068-20253-1-git-send-email-dillon.minfei@gmail.com>
References: <1626341068-20253-1-git-send-email-dillon.minfei@gmail.com>
Precedence: bulk

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