video: adf: support "simple" buffers

Simple buffers are linear RGB buffers analogous to KMS's dumb buffers.
Simple buffers can be allocated and posted to a display interface
without any driver-private data.

Internally, ADF drivers provide the driver-private data needed (if any)
to post a simple buffer to the display.

Change-Id: Ib0b737622eaf343111310f6623f99d69cf3807d2
Signed-off-by: Greg Hackmann <ghackmann@google.com>

2 files changed, 163 insertions, 0 deletions

diff --git a/drivers/video/adf/adf_client.c b/drivers/video/adf/adf_client.c
index f52b29d1a9a..48e97ef262f 100644
--- a/drivers/video/adf/adf_client.c
+++ b/drivers/video/adf/adf_client.c
@@ -762,3 +762,81 @@ done:
 	return ret;
 }
 EXPORT_SYMBOL(adf_device_detach);
+
+/**
+ * adf_interface_simple_buffer_alloc - allocate a simple buffer
+ *
+ * @intf: target interface
+ * @w: width in pixels
+ * @h: height in pixels
+ * @format: format fourcc
+ * @dma_buf: returns the allocated buffer
+ * @offset: returns the byte offset of the allocated buffer's first pixel
+ * @pitch: returns the allocated buffer's pitch
+ *
+ * See &struct adf_simple_buffer_alloc for a description of simple buffers and
+ * their limitations.
+ *
+ * Returns 0 on success or -errno on failure.
+ */
+int adf_interface_simple_buffer_alloc(struct adf_interface *intf, u16 w, u16 h,
+		u32 format, struct dma_buf **dma_buf, u32 *offset, u32 *pitch)
+{
+	if (!intf->ops || !intf->ops->alloc_simple_buffer)
+		return -EOPNOTSUPP;
+
+	if (!adf_format_is_rgb(format))
+		return -EINVAL;
+
+	return intf->ops->alloc_simple_buffer(intf, w, h, format, dma_buf,
+			offset, pitch);
+}
+EXPORT_SYMBOL(adf_interface_simple_buffer_alloc);
+
+/**
+ * adf_interface_simple_post - flip to a single buffer
+ *
+ * @intf: interface targeted by the flip
+ * @buf: buffer to display
+ *
+ * adf_interface_simple_post() can be used generically for simple display
+ * configurations, since the client does not need to provide any driver-private
+ * configuration data.
+ *
+ * adf_interface_simple_post() has the same copying semantics as
+ * adf_device_post().
+ *
+ * On success, returns a sync fence which signals when the buffer is removed
+ * from the screen.  On failure, returns ERR_PTR(-errno).
+ */
+struct sync_fence *adf_interface_simple_post(struct adf_interface *intf,
+		struct adf_buffer *buf)
+{
+	size_t custom_data_size = 0;
+	void *custom_data = NULL;
+	struct sync_fence *ret;
+
+	if (intf->ops && intf->ops->describe_simple_post) {
+		int err;
+
+		custom_data = kzalloc(ADF_MAX_CUSTOM_DATA_SIZE, GFP_KERNEL);
+		if (!custom_data) {
+			ret = ERR_PTR(-ENOMEM);
+			goto done;
+		}
+
+		err = intf->ops->describe_simple_post(intf, buf, custom_data,
+				&custom_data_size);
+		if (err < 0) {
+			ret = ERR_PTR(err);
+			goto done;
+		}
+	}
+
+	ret = adf_device_post(adf_interface_parent(intf), &intf, 1, buf, 1,
+			custom_data, custom_data_size);
+done:
+	kfree(custom_data);
+	return ret;
+}
+EXPORT_SYMBOL(adf_interface_simple_post);
diff --git a/drivers/video/adf/adf_fops.c b/drivers/video/adf/adf_fops.c
index 90b234a7666..d2e30c9cddc 100644
--- a/drivers/video/adf/adf_fops.c
+++ b/drivers/video/adf/adf_fops.c
@@ -310,6 +310,79 @@ err_get_user:
 	return ret;
 }
 
+static int adf_intf_simple_post_config(struct adf_interface *intf,
+		struct adf_simple_post_config __user *arg)
+{
+	struct adf_device *dev = intf->base.parent;
+	struct sync_fence *complete_fence;
+	int complete_fence_fd;
+	struct adf_buffer buf;
+	int ret = 0;
+
+	complete_fence_fd = get_unused_fd();
+	if (complete_fence_fd < 0)
+		return complete_fence_fd;
+
+	ret = adf_buffer_import(dev, &arg->buf, &buf);
+	if (ret < 0)
+		goto err_import;
+
+	if (put_user(complete_fence_fd, &arg->complete_fence)) {
+		ret = -EFAULT;
+		goto err_put_user;
+	}
+
+	complete_fence = adf_interface_simple_post(intf, &buf);
+	if (IS_ERR(complete_fence)) {
+		ret = PTR_ERR(complete_fence);
+		goto err_put_user;
+	}
+
+	sync_fence_install(complete_fence, complete_fence_fd);
+	return 0;
+
+err_put_user:
+	adf_buffer_cleanup(&buf);
+err_import:
+	put_unused_fd(complete_fence_fd);
+	return ret;
+}
+
+static int adf_intf_simple_buffer_alloc(struct adf_interface *intf,
+		struct adf_simple_buffer_alloc __user *arg)
+{
+	struct adf_simple_buffer_alloc data;
+	struct dma_buf *dma_buf;
+	int ret = 0;
+
+	if (copy_from_user(&data, arg, sizeof(data)))
+		return -EFAULT;
+
+	data.fd = get_unused_fd_flags(O_CLOEXEC);
+	if (data.fd < 0)
+		return data.fd;
+
+	ret = adf_interface_simple_buffer_alloc(intf, data.w, data.h,
+			data.format, &dma_buf, &data.offset, &data.pitch);
+	if (ret < 0)
+		goto err_alloc;
+
+	if (copy_to_user(arg, &data, sizeof(*arg))) {
+		ret = -EFAULT;
+		goto err_copy;
+	}
+
+	fd_install(data.fd, dma_buf->file);
+	return 0;
+
+err_copy:
+	dma_buf_put(dma_buf);
+
+err_alloc:
+	put_unused_fd(data.fd);
+	return ret;
+}
+
 static int adf_copy_attachment_list_to_user(
 		struct adf_attachment_config __user *to, size_t n_to,
 		struct adf_attachment *from, size_t n_from)
@@ -539,6 +612,8 @@ static long adf_overlay_engine_ioctl(struct adf_overlay_engine *eng,
 	case ADF_SET_MODE:
 	case ADF_GET_DEVICE_DATA:
 	case ADF_GET_INTERFACE_DATA:
+	case ADF_SIMPLE_POST_CONFIG:
+	case ADF_SIMPLE_BUFFER_ALLOC:
 	case ADF_ATTACH:
 	case ADF_DETACH:
 		return -EINVAL;
@@ -567,6 +642,14 @@ static long adf_interface_ioctl(struct adf_interface *intf,
 		return adf_intf_get_data(intf,
 				(struct adf_interface_data __user *)arg);
 
+	case ADF_SIMPLE_POST_CONFIG:
+		return adf_intf_simple_post_config(intf,
+				(struct adf_simple_post_config __user *)arg);
+
+	case ADF_SIMPLE_BUFFER_ALLOC:
+		return adf_intf_simple_buffer_alloc(intf,
+				(struct adf_simple_buffer_alloc __user *)arg);
+
 	case ADF_POST_CONFIG:
 	case ADF_GET_DEVICE_DATA:
 	case ADF_GET_OVERLAY_ENGINE_DATA:
@@ -609,6 +692,8 @@ static long adf_device_ioctl(struct adf_device *dev, struct adf_file *file,
 	case ADF_SET_MODE:
 	case ADF_GET_INTERFACE_DATA:
 	case ADF_GET_OVERLAY_ENGINE_DATA:
+	case ADF_SIMPLE_POST_CONFIG:
+	case ADF_SIMPLE_BUFFER_ALLOC:
 		return -EINVAL;
 
 	default: