From: Paul Cercueil <paul@crapouillou.net>
To: "Greg Kroah-Hartman" <gregkh@linuxfoundation.org>,
"Jonathan Corbet" <corbet@lwn.net>,
"Sumit Semwal" <sumit.semwal@linaro.org>,
"Christian König" <christian.koenig@amd.com>
Cc: "Jonathan Cameron" <jic23@kernel.org>,
"Nuno Sá" <noname.nuno@gmail.com>,
"Michael Hennerich" <Michael.Hennerich@analog.com>,
linux-usb@vger.kernel.org, linux-doc@vger.kernel.org,
linux-kernel@vger.kernel.org, linux-media@vger.kernel.org,
dri-devel@lists.freedesktop.org, linaro-mm-sig@lists.linaro.org,
"Paul Cercueil" <paul@crapouillou.net>
Subject: [PATCH v5 2/6] dma-buf: udmabuf: Implement .{begin,end}_access
Date: Fri, 19 Jan 2024 15:13:58 +0100 [thread overview]
Message-ID: <20240119141402.44262-3-paul@crapouillou.net> (raw)
In-Reply-To: <20240119141402.44262-1-paul@crapouillou.net>
Implement .begin_access() and .end_access() callbacks.
For now these functions will simply sync/flush the CPU cache when
needed.
Signed-off-by: Paul Cercueil <paul@crapouillou.net>
---
v5: New patch
---
drivers/dma-buf/udmabuf.c | 27 +++++++++++++++++++++++++++
1 file changed, 27 insertions(+)
diff --git a/drivers/dma-buf/udmabuf.c b/drivers/dma-buf/udmabuf.c
index c40645999648..a87d89b58816 100644
--- a/drivers/dma-buf/udmabuf.c
+++ b/drivers/dma-buf/udmabuf.c
@@ -179,6 +179,31 @@ static int end_cpu_udmabuf(struct dma_buf *buf,
return 0;
}
+static int begin_udmabuf(struct dma_buf_attachment *attach,
+ struct sg_table *sgt,
+ enum dma_data_direction dir)
+{
+ struct dma_buf *buf = attach->dmabuf;
+ struct udmabuf *ubuf = buf->priv;
+ struct device *dev = ubuf->device->this_device;
+
+ dma_sync_sg_for_device(dev, sgt->sgl, sg_nents(sgt->sgl), dir);
+ return 0;
+}
+
+static int end_udmabuf(struct dma_buf_attachment *attach,
+ struct sg_table *sgt,
+ enum dma_data_direction dir)
+{
+ struct dma_buf *buf = attach->dmabuf;
+ struct udmabuf *ubuf = buf->priv;
+ struct device *dev = ubuf->device->this_device;
+
+ if (dir != DMA_TO_DEVICE)
+ dma_sync_sg_for_cpu(dev, sgt->sgl, sg_nents(sgt->sgl), dir);
+ return 0;
+}
+
static const struct dma_buf_ops udmabuf_ops = {
.cache_sgt_mapping = true,
.map_dma_buf = map_udmabuf,
@@ -189,6 +214,8 @@ static const struct dma_buf_ops udmabuf_ops = {
.vunmap = vunmap_udmabuf,
.begin_cpu_access = begin_cpu_udmabuf,
.end_cpu_access = end_cpu_udmabuf,
+ .begin_access = begin_udmabuf,
+ .end_access = end_udmabuf,
};
#define SEALS_WANTED (F_SEAL_SHRINK)
--
2.43.0
next prev parent reply other threads:[~2024-01-19 14:14 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-01-19 14:13 [PATCH v5 0/6] usb: gadget: functionfs: DMABUF import interface Paul Cercueil
2024-01-19 14:13 ` [PATCH v5 1/6] dma-buf: Add dma_buf_{begin,end}_access() Paul Cercueil
2024-01-20 20:20 ` kernel test robot
2024-01-22 10:35 ` [Linaro-mm-sig] " Christian König
2024-01-22 11:01 ` Paul Cercueil
2024-01-22 13:41 ` Christian König
2024-01-23 10:10 ` Paul Cercueil
2024-01-23 11:52 ` Christian König
2024-01-23 13:02 ` Paul Cercueil
[not found] ` <577501f9-9d1c-4f8d-9882-7c71090e5ef3@amd.com>
2024-01-24 10:58 ` Paul Cercueil
2024-01-24 15:38 ` Andrew Davis
2024-01-24 15:52 ` Paul Cercueil
[not found] ` <2ac7562c-d221-409a-bfee-1b3cfcc0f1c6@amd.com>
2024-01-25 18:01 ` Daniel Vetter
2024-01-26 16:42 ` Christian König
2024-01-30 9:01 ` [Linaro-mm-sig] " Daniel Vetter
[not found] ` <a2346244-e22b-4ff6-b6cd-1da7138725ae@amd.com>
2024-01-30 9:48 ` Paul Cercueil
2024-01-30 10:40 ` Daniel Vetter
2024-01-30 13:09 ` Christian König
2024-01-31 9:07 ` Daniel Vetter
2024-02-06 13:28 ` Christian König
2024-02-06 13:57 ` Daniel Vetter
2024-01-30 10:38 ` Daniel Vetter
2024-01-25 18:10 ` Daniel Vetter
2024-01-19 14:13 ` Paul Cercueil [this message]
2024-02-07 17:10 ` [Linaro-mm-sig] [PATCH v5 2/6] dma-buf: udmabuf: Implement .{begin,end}_access Daniel Vetter
2024-01-19 14:13 ` [PATCH v5 3/6] usb: gadget: Support already-mapped DMA SGs Paul Cercueil
2024-01-19 14:14 ` [PATCH v5 4/6] usb: gadget: functionfs: Factorize wait-for-endpoint code Paul Cercueil
2024-01-19 14:14 ` [PATCH v5 5/6] usb: gadget: functionfs: Add DMABUF import interface Paul Cercueil
2024-01-19 14:14 ` [PATCH v5 6/6] Documentation: usb: Document FunctionFS DMABUF API Paul Cercueil
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