[PATCH 3/9] dma-heap: Provide accessors so that in-kernel drivers can allocate dmabufs from specific heaps

[Yong Wu]

From: John Stultz <jstultz at google.com>

This allows drivers who don't want to create their own
DMA-BUF exporter to be able to allocate DMA-BUFs directly
from existing DMA-BUF Heaps.

There is some concern that the premise of DMA-BUF heaps is
that userland knows better about what type of heap memory
is needed for a pipeline, so it would likely be best for
drivers to import and fill DMA-BUFs allocated by userland
instead of allocating one themselves, but this is still
up for debate.

Signed-off-by: John Stultz <jstultz at google.com>
Signed-off-by: T.J. Mercier <tjmercier at google.com>
Signed-off-by: Yong Wu <yong.wu at mediatek.com>
[Yong: Fix the checkpatch alignment warning]
---
 drivers/dma-buf/dma-heap.c | 60 ++++++++++++++++++++++++++++----------
 include/linux/dma-heap.h   | 25 ++++++++++++++++
 2 files changed, 69 insertions(+), 16 deletions(-)

diff --git a/drivers/dma-buf/dma-heap.c b/drivers/dma-buf/dma-heap.c
index dcc0e38c61fa..908bb30dc864 100644
--- a/drivers/dma-buf/dma-heap.c
+++ b/drivers/dma-buf/dma-heap.c
@@ -53,12 +53,15 @@ static dev_t dma_heap_devt;
 static struct class *dma_heap_class;
 static DEFINE_XARRAY_ALLOC(dma_heap_minors);
 
-static int dma_heap_buffer_alloc(struct dma_heap *heap, size_t len,
-				 unsigned int fd_flags,
-				 unsigned int heap_flags)
+struct dma_buf *dma_heap_buffer_alloc(struct dma_heap *heap, size_t len,
+				      unsigned int fd_flags,
+				      unsigned int heap_flags)
 {
-	struct dma_buf *dmabuf;
-	int fd;
+	if (fd_flags & ~DMA_HEAP_VALID_FD_FLAGS)
+		return ERR_PTR(-EINVAL);
+
+	if (heap_flags & ~DMA_HEAP_VALID_HEAP_FLAGS)
+		return ERR_PTR(-EINVAL);
 
 	/*
 	 * Allocations from all heaps have to begin
@@ -66,9 +69,20 @@ static int dma_heap_buffer_alloc(struct dma_heap *heap, size_t len,
 	 */
 	len = PAGE_ALIGN(len);
 	if (!len)
-		return -EINVAL;
+		return ERR_PTR(-EINVAL);
 
-	dmabuf = heap->ops->allocate(heap, len, fd_flags, heap_flags);
+	return heap->ops->allocate(heap, len, fd_flags, heap_flags);
+}
+EXPORT_SYMBOL_GPL(dma_heap_buffer_alloc);
+
+static int dma_heap_bufferfd_alloc(struct dma_heap *heap, size_t len,
+				   unsigned int fd_flags,
+				   unsigned int heap_flags)
+{
+	struct dma_buf *dmabuf;
+	int fd;
+
+	dmabuf = dma_heap_buffer_alloc(heap, len, fd_flags, heap_flags);
 	if (IS_ERR(dmabuf))
 		return PTR_ERR(dmabuf);
 
@@ -106,15 +120,9 @@ static long dma_heap_ioctl_allocate(struct file *file, void *data)
 	if (heap_allocation->fd)
 		return -EINVAL;
 
-	if (heap_allocation->fd_flags & ~DMA_HEAP_VALID_FD_FLAGS)
-		return -EINVAL;
-
-	if (heap_allocation->heap_flags & ~DMA_HEAP_VALID_HEAP_FLAGS)
-		return -EINVAL;
-
-	fd = dma_heap_buffer_alloc(heap, heap_allocation->len,
-				   heap_allocation->fd_flags,
-				   heap_allocation->heap_flags);
+	fd = dma_heap_bufferfd_alloc(heap, heap_allocation->len,
+				     heap_allocation->fd_flags,
+				     heap_allocation->heap_flags);
 	if (fd < 0)
 		return fd;
 
@@ -205,6 +213,7 @@ const char *dma_heap_get_name(struct dma_heap *heap)
 {
 	return heap->name;
 }
+EXPORT_SYMBOL_GPL(dma_heap_get_name);
 
 struct dma_heap *dma_heap_add(const struct dma_heap_export_info *exp_info)
 {
@@ -290,6 +299,24 @@ struct dma_heap *dma_heap_add(const struct dma_heap_export_info *exp_info)
 	kfree(heap);
 	return err_ret;
 }
+EXPORT_SYMBOL_GPL(dma_heap_add);
+
+struct dma_heap *dma_heap_find(const char *name)
+{
+	struct dma_heap *h;
+
+	mutex_lock(&heap_list_lock);
+	list_for_each_entry(h, &heap_list, list) {
+		if (!strcmp(h->name, name)) {
+			kref_get(&h->refcount);
+			mutex_unlock(&heap_list_lock);
+			return h;
+		}
+	}
+	mutex_unlock(&heap_list_lock);
+	return NULL;
+}
+EXPORT_SYMBOL_GPL(dma_heap_find);
 
 static void dma_heap_release(struct kref *ref)
 {
@@ -315,6 +342,7 @@ void dma_heap_put(struct dma_heap *h)
 	kref_put(&h->refcount, dma_heap_release);
 	mutex_unlock(&heap_list_lock);
 }
+EXPORT_SYMBOL_GPL(dma_heap_put);
 
 static char *dma_heap_devnode(const struct device *dev, umode_t *mode)
 {
diff --git a/include/linux/dma-heap.h b/include/linux/dma-heap.h
index f3c678892c5c..59e70f6c7a60 100644
--- a/include/linux/dma-heap.h
+++ b/include/linux/dma-heap.h
@@ -64,10 +64,35 @@ const char *dma_heap_get_name(struct dma_heap *heap);
  */
 struct dma_heap *dma_heap_add(const struct dma_heap_export_info *exp_info);
 
+/**
+ * dma_heap_find - get the heap registered with the specified name
+ * @name: Name of the DMA-Heap to find
+ *
+ * Returns:
+ * The DMA-Heap with the provided name.
+ *
+ * NOTE: DMA-Heaps returned from this function MUST be released using
+ * dma_heap_put() when the user is done to enable the heap to be unloaded.
+ */
+struct dma_heap *dma_heap_find(const char *name);
+
 /**
  * dma_heap_put - drops a reference to a dmabuf heap, potentially freeing it
  * @heap: the heap whose reference count to decrement
  */
 void dma_heap_put(struct dma_heap *heap);
 
+/**
+ * dma_heap_buffer_alloc - Allocate dma-buf from a dma_heap
+ * @heap:	DMA-Heap to allocate from
+ * @len:	size to allocate in bytes
+ * @fd_flags:	flags to set on returned dma-buf fd
+ * @heap_flags: flags to pass to the dma heap
+ *
+ * This is for internal dma-buf allocations only. Free returned buffers with dma_buf_put().
+ */
+struct dma_buf *dma_heap_buffer_alloc(struct dma_heap *heap, size_t len,
+				      unsigned int fd_flags,
+				      unsigned int heap_flags);
+
 #endif /* _DMA_HEAPS_H */
-- 
2.25.1