[media] v4l: videobuf2: add DMA coherent allocator

Add an implementation of DMA coherent memory allocator and handling
routines for videobuf2, implemented on top of dma_alloc_coherent() call.

Signed-off-by: Pawel Osciak <p.osciak@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
CC: Pawel Osciak <pawel@osciak.com>
Reviewed-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

diff --git a/drivers/media/video/Kconfig b/drivers/media/video/Kconfig
index b8c21a7..b64183e 100644 (file)
--- a/drivers/media/video/Kconfig
+++ b/drivers/media/video/Kconfig
@@ -50,6 +50,11 @@ config VIDEOBUF2_CORE
 config VIDEOBUF2_MEMOPS
        tristate
 
+config VIDEOBUF2_DMA_CONTIG
+       select VIDEOBUF2_CORE
+       select VIDEOBUF2_MEMOPS
+       tristate
+
 config VIDEOBUF2_VMALLOC
        select VIDEOBUF2_CORE
        select VIDEOBUF2_MEMOPS

diff --git a/drivers/media/video/Makefile b/drivers/media/video/Makefile
index e31c88e..106d40b 100644 (file)
--- a/drivers/media/video/Makefile
+++ b/drivers/media/video/Makefile
@@ -114,6 +114,7 @@ obj-$(CONFIG_VIDEO_BTCX)  += btcx-risc.o
 obj-$(CONFIG_VIDEOBUF2_CORE)           += videobuf2-core.o
 obj-$(CONFIG_VIDEOBUF2_MEMOPS)         += videobuf2-memops.o
 obj-$(CONFIG_VIDEOBUF2_VMALLOC)                += videobuf2-vmalloc.o
+obj-$(CONFIG_VIDEOBUF2_DMA_CONTIG)     += videobuf2-dma-contig.o
 
 obj-$(CONFIG_V4L2_MEM2MEM_DEV) += v4l2-mem2mem.o
 

diff --git a/drivers/media/video/videobuf2-dma-contig.c b/drivers/media/video/videobuf2-dma-contig.c
new file mode 100644 (file)
index 0000000..bb6a560
--- /dev/null
+++ b/drivers/media/video/videobuf2-dma-contig.c
@@ -0,0 +1,185 @@
+/*
+ * videobuf2-dma-contig.c - DMA contig memory allocator for videobuf2
+ *
+ * Copyright (C) 2010 Samsung Electronics
+ *
+ * Author: Pawel Osciak <p.osciak@samsung.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation.
+ */
+
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/dma-mapping.h>
+
+#include <media/videobuf2-core.h>
+#include <media/videobuf2-memops.h>
+
+struct vb2_dc_conf {
+       struct device           *dev;
+};
+
+struct vb2_dc_buf {
+       struct vb2_dc_conf              *conf;
+       void                            *vaddr;
+       dma_addr_t                      paddr;
+       unsigned long                   size;
+       struct vm_area_struct           *vma;
+       atomic_t                        refcount;
+       struct vb2_vmarea_handler       handler;
+};
+
+static void vb2_dma_contig_put(void *buf_priv);
+
+static void *vb2_dma_contig_alloc(void *alloc_ctx, unsigned long size)
+{
+       struct vb2_dc_conf *conf = alloc_ctx;
+       struct vb2_dc_buf *buf;
+
+       buf = kzalloc(sizeof *buf, GFP_KERNEL);
+       if (!buf)
+               return ERR_PTR(-ENOMEM);
+
+       buf->vaddr = dma_alloc_coherent(conf->dev, size, &buf->paddr,
+                                       GFP_KERNEL);
+       if (!buf->vaddr) {
+               dev_err(conf->dev, "dma_alloc_coherent of size %ld failed\n",
+                       buf->size);
+               kfree(buf);
+               return ERR_PTR(-ENOMEM);
+       }
+
+       buf->conf = conf;
+       buf->size = size;
+
+       buf->handler.refcount = &buf->refcount;
+       buf->handler.put = vb2_dma_contig_put;
+       buf->handler.arg = buf;
+
+       atomic_inc(&buf->refcount);
+
+       return buf;
+}
+
+static void vb2_dma_contig_put(void *buf_priv)
+{
+       struct vb2_dc_buf *buf = buf_priv;
+
+       if (atomic_dec_and_test(&buf->refcount)) {
+               dma_free_coherent(buf->conf->dev, buf->size, buf->vaddr,
+                                 buf->paddr);
+               kfree(buf);
+       }
+}
+
+static void *vb2_dma_contig_cookie(void *buf_priv)
+{
+       struct vb2_dc_buf *buf = buf_priv;
+
+       return (void *)buf->paddr;
+}
+
+static void *vb2_dma_contig_vaddr(void *buf_priv)
+{
+       struct vb2_dc_buf *buf = buf_priv;
+       if (!buf)
+               return 0;
+
+       return buf->vaddr;
+}
+
+static unsigned int vb2_dma_contig_num_users(void *buf_priv)
+{
+       struct vb2_dc_buf *buf = buf_priv;
+
+       return atomic_read(&buf->refcount);
+}
+
+static int vb2_dma_contig_mmap(void *buf_priv, struct vm_area_struct *vma)
+{
+       struct vb2_dc_buf *buf = buf_priv;
+
+       if (!buf) {
+               printk(KERN_ERR "No buffer to map\n");
+               return -EINVAL;
+       }
+
+       return vb2_mmap_pfn_range(vma, buf->paddr, buf->size,
+                                 &vb2_common_vm_ops, &buf->handler);
+}
+
+static void *vb2_dma_contig_get_userptr(void *alloc_ctx, unsigned long vaddr,
+                                       unsigned long size, int write)
+{
+       struct vb2_dc_buf *buf;
+       struct vm_area_struct *vma;
+       dma_addr_t paddr = 0;
+       int ret;
+
+       buf = kzalloc(sizeof *buf, GFP_KERNEL);
+       if (!buf)
+               return ERR_PTR(-ENOMEM);
+
+       ret = vb2_get_contig_userptr(vaddr, size, &vma, &paddr);
+       if (ret) {
+               printk(KERN_ERR "Failed acquiring VMA for vaddr 0x%08lx\n",
+                               vaddr);
+               kfree(buf);
+               return ERR_PTR(ret);
+       }
+
+       buf->size = size;
+       buf->paddr = paddr;
+       buf->vma = vma;
+
+       return buf;
+}
+
+static void vb2_dma_contig_put_userptr(void *mem_priv)
+{
+       struct vb2_dc_buf *buf = mem_priv;
+
+       if (!buf)
+               return;
+
+       vb2_put_vma(buf->vma);
+       kfree(buf);
+}
+
+const struct vb2_mem_ops vb2_dma_contig_memops = {
+       .alloc          = vb2_dma_contig_alloc,
+       .put            = vb2_dma_contig_put,
+       .cookie         = vb2_dma_contig_cookie,
+       .vaddr          = vb2_dma_contig_vaddr,
+       .mmap           = vb2_dma_contig_mmap,
+       .get_userptr    = vb2_dma_contig_get_userptr,
+       .put_userptr    = vb2_dma_contig_put_userptr,
+       .num_users      = vb2_dma_contig_num_users,
+};
+EXPORT_SYMBOL_GPL(vb2_dma_contig_memops);
+
+void *vb2_dma_contig_init_ctx(struct device *dev)
+{
+       struct vb2_dc_conf *conf;
+
+       conf = kzalloc(sizeof *conf, GFP_KERNEL);
+       if (!conf)
+               return ERR_PTR(-ENOMEM);
+
+       conf->dev = dev;
+
+       return conf;
+}
+EXPORT_SYMBOL_GPL(vb2_dma_contig_init_ctx);
+
+void vb2_dma_contig_cleanup_ctx(void *alloc_ctx)
+{
+       kfree(alloc_ctx);
+}
+EXPORT_SYMBOL_GPL(vb2_dma_contig_cleanup_ctx);
+
+MODULE_DESCRIPTION("DMA-contig memory handling routines for videobuf2");
+MODULE_AUTHOR("Pawel Osciak");
+MODULE_LICENSE("GPL");

diff --git a/include/media/videobuf2-dma-contig.h b/include/media/videobuf2-dma-contig.h
new file mode 100644 (file)
index 0000000..fb7ca84
--- /dev/null
+++ b/include/media/videobuf2-dma-contig.h
@@ -0,0 +1,29 @@
+/*
+ * videobuf2-dma-coherent.h - DMA coherent memory allocator for videobuf2
+ *
+ * Copyright (C) 2010 Samsung Electronics
+ *
+ * Author: Pawel Osciak <p.osciak@samsung.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation.
+ */
+
+#ifndef _MEDIA_VIDEOBUF2_DMA_COHERENT_H
+#define _MEDIA_VIDEOBUF2_DMA_COHERENT_H
+
+#include <media/videobuf2-core.h>
+
+static inline unsigned long vb2_dma_contig_plane_paddr(
+               struct vb2_buffer *vb, unsigned int plane_no)
+{
+       return (unsigned long)vb2_plane_cookie(vb, plane_no);
+}
+
+void *vb2_dma_contig_init_ctx(struct device *dev);
+void vb2_dma_contig_cleanup_ctx(void *alloc_ctx);
+
+extern const struct vb2_mem_ops vb2_dma_contig_memops;
+
+#endif