Add support for the CMA contiguous memory allocator to videobuf2.
Signed-off-by: Pawel Osciak <p.osciak@xxxxxxxxxxx>
Signed-off-by: Kyungmin Park <kyungmin.park@xxxxxxxxxxx>
---
drivers/media/video/Kconfig | 5 +
drivers/media/video/Makefile | 2 +
drivers/media/video/videobuf2-cma.c | 250 +++++++++++++++++++++++++++++++++++
include/media/videobuf2-cma.h | 25 ++++
4 files changed, 282 insertions(+), 0 deletions(-)
create mode 100644 drivers/media/video/videobuf2-cma.c
create mode 100644 include/media/videobuf2-cma.h
diff --git a/drivers/media/video/Kconfig b/drivers/media/video/Kconfig
index c2ea549..b63f377 100644
--- a/drivers/media/video/Kconfig
+++ b/drivers/media/video/Kconfig
@@ -65,6 +65,11 @@ config VIDEOBUF2_VMALLOC
select VIDEOBUF2_GEN_MEMOPS
tristate
+config VIDEOBUF2_CMA
+ depends on CMA
+ select VIDEOBUF2_CORE
+ select VIDEOBUF2_GEN_MEMOPS
+ tristate
#
# Multimedia Video device configuration
diff --git a/drivers/media/video/Makefile b/drivers/media/video/Makefile
index 20d359d..4146700 100644
--- a/drivers/media/video/Makefile
+++ b/drivers/media/video/Makefile
@@ -128,6 +128,8 @@ obj-$(CONFIG_VIDEOBUF2_VMALLOC) += videobuf2_vmalloc.o
videobuf2_vmalloc-y := videobuf2-vmalloc.o \
videobuf2-memops.o
+obj-$(CONFIG_VIDEOBUF2_CMA) += videobuf2_cma.o
+videobuf2_cma-y := videobuf2-cma.o videobuf2-memops.o
obj-$(CONFIG_V4L2_MEM2MEM_DEV) += v4l2-mem2mem.o
diff --git a/drivers/media/video/videobuf2-cma.c b/drivers/media/video/videobuf2-cma.c
new file mode 100644
index 0000000..c51e5a8
--- /dev/null
+++ b/drivers/media/video/videobuf2-cma.c
@@ -0,0 +1,250 @@
+/*
+ * videobuf2-cma.c - CMA memory allocator for videobuf2
+ *
+ * Copyright (C) 2010 Samsung Electronics
+ *
+ * Author: Pawel Osciak <p.osciak@xxxxxxxxxxx>
+ *
+ * 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/cma.h>
+#include <linux/mm.h>
+#include <linux/sched.h>
+#include <linux/file.h>
+
+#include <media/videobuf2-core.h>
+#include <media/videobuf2-memops.h>
+
+struct vb2_cma_conf {
+ struct vb2_alloc_ctx alloc_ctx;
+ struct device *dev;
+ const char *type;
+ unsigned long alignment;
+};
+
+struct vb2_cma_buf {
+ struct vb2_cma_conf *conf;
+ dma_addr_t paddr;
+ unsigned long size;
+ unsigned int refcount;
+ struct vm_area_struct *vma;
+};
+
+static void *vb2_cma_alloc(const struct vb2_alloc_ctx *alloc_ctx,
+ unsigned long size)
+{
+ struct vb2_cma_conf *conf =
+ container_of(alloc_ctx, struct vb2_cma_conf, alloc_ctx);
+ struct vb2_cma_buf *buf;
+
+ buf = kzalloc(sizeof *buf, GFP_KERNEL);
+ if (!buf)
+ return ERR_PTR(-ENOMEM);
+
+ buf->paddr = cma_alloc(conf->dev, conf->type, size, conf->alignment);
+ if (!buf->paddr) {
+ printk(KERN_ERR "cma_alloc of size %ld failed\n", size);
+ kfree(buf);
+ return ERR_PTR(-ENOMEM);
+ }
+
+ buf->conf = conf;
+ buf->size = size;
+ buf->refcount++;
+
+ printk(KERN_DEBUG "Allocated cma mem of size %ld at paddr=0x%08x\n",
+ buf->size, buf->paddr);
+
+ return buf;
+}
+
+static void vb2_cma_put(void *buf_priv)
+{
+ struct vb2_cma_buf *buf = buf_priv;
+
+ buf->refcount--;
+
+ if (0 == buf->refcount) {
+ cma_free(buf->paddr);
+ kfree(buf);
+ }
+}
+
+static unsigned long vb2_cma_paddr(void *buf_priv)
+{
+ struct vb2_cma_buf *buf = buf_priv;
+
+ return buf->paddr;
+}
+
+static unsigned int vb2_cma_num_users(void *buf_priv)
+{
+ struct vb2_cma_buf *buf = buf_priv;
+
+ return buf->refcount;
+}
+
+static void vb2_cma_vm_open(struct vm_area_struct *vma)
+{
+ struct vb2_cma_buf *buf = vma->vm_private_data;
+
+ printk(KERN_DEBUG "%s cma_priv: %p, refcount: %d, "
+ "vma: %08lx-%08lx\n", __func__, buf, buf->refcount,
+ vma->vm_start, vma->vm_end);
+
+ buf->refcount++;
+}
+
+static void vb2_cma_vm_close(struct vm_area_struct *vma)
+{
+ struct vb2_cma_buf *buf = vma->vm_private_data;
+
+ printk(KERN_DEBUG "%s cma_priv: %p, refcount: %d, "
+ "vma: %08lx-%08lx\n", __func__, buf, buf->refcount,
+ vma->vm_start, vma->vm_end);
+
+ vb2_cma_put(buf);
+}
+
+static const struct vm_operations_struct vb2_cma_vm_ops = {
+ .open = vb2_cma_vm_open,
+ .close = vb2_cma_vm_close,
+};
+
+static int vb2_cma_mmap(void *buf_priv, struct vm_area_struct *vma)
+{
+ struct vb2_cma_buf *buf = buf_priv;
+
+ if (!buf) {
+ printk(KERN_ERR "No memory to map\n");
+ return -EINVAL;
+ }
+
+ return vb2_mmap_pfn_range(vma, buf->paddr, buf->size,
+ &vb2_cma_vm_ops, buf);
+}
+
+static void *vb2_cma_get_userptr(unsigned long vaddr, unsigned long size)
+{
+ struct vb2_cma_buf *buf;
+ unsigned long paddr = 0;
+ int ret;
+
+ buf = kzalloc(sizeof *buf, GFP_KERNEL);
+ if (!buf)
+ return ERR_PTR(-ENOMEM);
+
+ buf->vma = vb2_get_userptr(vaddr);
+ if (!buf->vma) {
+ printk(KERN_ERR "Failed acquiring VMA for vaddr 0x%08lx\n",
+ vaddr);
+ ret = -EINVAL;
+ goto done;
+ }
+
+ ret = vb2_contig_verify_userptr(buf->vma, vaddr, size, &paddr);
+ if (ret) {
+ vb2_put_userptr(buf->vma);
+ goto done;
+ }
+
+ buf->size = size;
+ buf->paddr = paddr;
+
+ return buf;
+
+done:
+ kfree(buf);
+ return ERR_PTR(ret);
+}
+
+static void vb2_cma_put_userptr(void *mem_priv)
+{
+ struct vb2_cma_buf *buf = mem_priv;
+
+ if (!buf)
+ return;
+
+ vb2_put_userptr(buf->vma);
+ kfree(buf);
+}
+
+static const struct vb2_mem_ops vb2_cma_ops = {
+ .alloc = vb2_cma_alloc,
+ .put = vb2_cma_put,
+ .paddr = vb2_cma_paddr,
+ .mmap = vb2_cma_mmap,
+ .get_userptr = vb2_cma_get_userptr,
+ .put_userptr = vb2_cma_put_userptr,
+ .num_users = vb2_cma_num_users,
+};
+
+struct vb2_alloc_ctx *vb2_cma_init(struct device *dev, const char *type,
+ unsigned long alignment)
+{
+ struct vb2_cma_conf *conf;
+
+ conf = kzalloc(sizeof *conf, GFP_KERNEL);
+ if (!conf)
+ return ERR_PTR(-ENOMEM);
+
+ conf->dev = dev;
+ conf->type = type;
+ conf->alignment = alignment;
+ conf->alloc_ctx.mem_ops = &vb2_cma_ops;
+
+ return &conf->alloc_ctx;
+}
+EXPORT_SYMBOL_GPL(vb2_cma_init);
+
+void vb2_cma_cleanup(struct vb2_alloc_ctx *alloc_ctx)
+{
+ struct vb2_cma_conf *conf =
+ container_of(alloc_ctx, struct vb2_cma_conf, alloc_ctx);
+
+ kfree(conf);
+}
+EXPORT_SYMBOL_GPL(vb2_cma_cleanup);
+
+struct vb2_alloc_ctx **vb2_cma_init_multi(struct device *dev,
+ unsigned int num_planes,
+ const char *types[],
+ unsigned long alignments[])
+{
+ struct vb2_alloc_ctx **alloc_ctxes;
+ struct vb2_cma_conf *cma_conf;
+ unsigned int i;
+
+ alloc_ctxes = kzalloc((sizeof *alloc_ctxes + sizeof *cma_conf)
+ * num_planes, GFP_KERNEL);
+ if (!alloc_ctxes)
+ return ERR_PTR(-ENOMEM);
+
+ cma_conf = (void *)(alloc_ctxes + num_planes);
+
+ for (i = 0; i < num_planes; ++i, ++cma_conf) {
+ alloc_ctxes[i] = &cma_conf->alloc_ctx;
+ cma_conf->dev = dev;
+ cma_conf->type = types[i];
+ cma_conf->alignment = alignments[i];
+ cma_conf->alloc_ctx.mem_ops = &vb2_cma_ops;
+ }
+
+ return alloc_ctxes;
+}
+EXPORT_SYMBOL_GPL(vb2_cma_init_multi);
+
+void vb2_cma_cleanup_multi(struct vb2_alloc_ctx **alloc_ctxes)
+{
+ kfree(alloc_ctxes);
+}
+EXPORT_SYMBOL_GPL(vb2_cma_cleanup_multi);
+
+MODULE_DESCRIPTION("CMA allocator handling routines for videobuf2");
+MODULE_AUTHOR("Pawel Osciak");
+MODULE_LICENSE("GPL");
diff --git a/include/media/videobuf2-cma.h b/include/media/videobuf2-cma.h
new file mode 100644
index 0000000..557eeb0
--- /dev/null
+++ b/include/media/videobuf2-cma.h
@@ -0,0 +1,25 @@
+/*
+ * videobuf2-cma.h - CMA memory allocator for videobuf2
+ *
+ * Copyright (C) 2010 Samsung Electronics
+ *
+ * Author: Pawel Osciak <p.osciak@xxxxxxxxxxx>
+ *
+ * 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.
+ */
+
+struct vb2_alloc_ctx *vb2_cma_init(struct device *dev, const char *type,
+ unsigned long alignment);
+void vb2_cma_cleanup(struct vb2_alloc_ctx *alloc_ctx);
+
+struct vb2_alloc_ctx **vb2_cma_init_multi(struct device *dev,
+ unsigned int num_planes, const char *types[],
+ unsigned long alignments[]);
+void vb2_cma_cleanup_multi(struct vb2_alloc_ctx **alloc_ctxes);
+
+struct vb2_alloc_ctx *vb2_cma_init(struct device *dev, const char *type,
+ unsigned long alignment);
+void vb2_cma_cleanup(struct vb2_alloc_ctx *alloc_ctx);
+
--
1.7.2.1.97.g3235b.dirty
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