linux-kernel - [PATCH v3] staging: android: ion: Add implementation of dma_buf_vmap and dma_buf

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Message-Id: <1517400222-2854-1-git-send-email-alexey.skidanov@intel.com>
Date:   Wed, 31 Jan 2018 14:03:42 +0200
From:   Alexey Skidanov <alexey.skidanov@...el.com>
To:     devel@...verdev.osuosl.org, labbott@...hat.com,
        gregkh@...uxfoundation.org
Cc:     sumit.semwal@...aro.org, rve@...roid.com, tkjos@...roid.com,
        maco@...roid.com, linux-kernel@...r.kernel.org,
        Alexey Skidanov <alexey.skidanov@...el.com>
Subject: [PATCH v3] staging: android: ion: Add implementation of dma_buf_vmap and dma_buf_vunmap

Any driver may access shared buffers, created by ion, using dma_buf_vmap and
dma_buf_vunmap dma-buf API that maps/unmaps previosuly allocated buffers into
the kernel virtual address space. The implementation of these API is missing in
the current ion implementation.

Signed-off-by: Alexey Skidanov <alexey.skidanov@...el.com>
---
 drivers/staging/android/ion/ion.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/drivers/staging/android/ion/ion.c b/drivers/staging/android/ion/ion.c
index f480885..4f1dc7f 100644
--- a/drivers/staging/android/ion/ion.c
+++ b/drivers/staging/android/ion/ion.c
@@ -327,6 +327,17 @@ static void ion_dma_buf_kunmap(struct dma_buf *dmabuf, unsigned long offset,
 {
 }
 
+static void *ion_dma_buf_vmap(struct dma_buf *dmabuf)
+{
+	struct ion_buffer *buffer = dmabuf->priv;
+
+	return buffer->vaddr;
+}
+
+static void ion_dma_buf_vunmap(struct dma_buf *dmabuf, void *vaddr)
+{
+}
+
 static int ion_dma_buf_begin_cpu_access(struct dma_buf *dmabuf,
 					enum dma_data_direction direction)
 {
@@ -388,6 +399,8 @@ static const struct dma_buf_ops dma_buf_ops = {
 	.unmap_atomic = ion_dma_buf_kunmap,
 	.map = ion_dma_buf_kmap,
 	.unmap = ion_dma_buf_kunmap,
+	.vmap = ion_dma_buf_vmap,
+	.vunmap = ion_dma_buf_vunmap
 };
 
 int ion_alloc(size_t len, unsigned int heap_id_mask, unsigned int flags)
-- 
2.7.4