+ * @mgr: fpga manager
+ * @info: fpga image info
+ *
+ * Step the low level fpga manager through the device-specific steps of getting
+ * an FPGA ready to be configured, writing the image to it, then doing whatever
+ * post-configuration steps necessary. This code assumes the caller got the
+ * mgr pointer from of_fpga_mgr_get() and checked that it is not an error code.
+ *
+ * Return: 0 on success, negative error code otherwise.
+ */
+static int fpga_dmabuf_load(struct fpga_manager *mgr,
+ struct fpga_image_info *info)
+{
+ struct dma_buf_attachment *attach;
+ struct sg_table *sgt;
+ int ret;
+
+ /* create attachment for dmabuf with the user device */
+ attach = dma_buf_attach(mgr->dmabuf, &mgr->dev);
+ if (IS_ERR(attach)) {
+ pr_err("failed to attach dmabuf\n");
+ ret = PTR_ERR(attach);
+ goto fail_put;
+ }
+
+ sgt = dma_buf_map_attachment(attach, DMA_BIDIRECTIONAL);
+ if (IS_ERR(sgt)) {
+ ret = PTR_ERR(sgt);
+ goto fail_detach;
+ }
+
+ info->sgt = sgt;
+ ret = fpga_mgr_buf_load_sg(mgr, info, info->sgt);
+ dma_buf_unmap_attachment(attach, sgt, DMA_BIDIRECTIONAL);
+
+fail_detach:
+ dma_buf_detach(mgr->dmabuf, attach);
+fail_put:
+ dma_buf_put(mgr->dmabuf);
+
+ return ret;
+}
+
/**
* fpga_mgr_firmware_load - request firmware and load to fpga
* @mgr: fpga manager
@@ -358,6 +405,8 @@ static int fpga_mgr_firmware_load(struct fpga_manager *mgr,
*/
int fpga_mgr_load(struct fpga_manager *mgr, struct fpga_image_info *info)
{
+ if (info->flags & FPGA_MGR_CONFIG_DMA_BUF)
+ return fpga_dmabuf_load(mgr, info);
if (info->sgt)
return fpga_mgr_buf_load_sg(mgr, info, info->sgt);
if (info->buf && info->count)
@@ -549,6 +598,62 @@ void fpga_mgr_unlock(struct fpga_manager *mgr)
}
EXPORT_SYMBOL_GPL(fpga_mgr_unlock);
+static int fpga_dmabuf_fd_get(struct file *file, char __user *argp)
+{
+ struct fpga_manager *mgr = (struct fpga_manager *)(file->private_data);
+ int buffd;
+
+ if (copy_from_user(&buffd, argp, sizeof(buffd)))
+ return -EFAULT;
+
+ mgr->dmabuf = dma_buf_get(buffd);
+ if (IS_ERR_OR_NULL(mgr->dmabuf))
+ return -EINVAL;
+
+ return 0;
+}
+
+static int fpga_device_open(struct inode *inode, struct file *file)
+{
+ struct miscdevice *miscdev = file->private_data;
+ struct fpga_manager *mgr = container_of(miscdev,
+ struct fpga_manager, miscdev);
+
+ file->private_data = mgr;
+
+ return 0;
+}
+
+static int fpga_device_release(struct inode *inode, struct file *file)
+{
+ return 0;
+}
+
+static long fpga_device_ioctl(struct file *file, unsigned int cmd,
+ unsigned long arg)
+{
+ char __user *argp = (char __user *)arg;
+ int err;
+
+ switch (cmd) {
+ case FPGA_IOCTL_LOAD_DMA_BUFF:
+ err = fpga_dmabuf_fd_get(file, argp);
+ break;
+ default:
+ err = -ENOTTY;
+ }
+
+ return err;
+}
+
+static const struct file_operations fpga_fops = {
+ .owner = THIS_MODULE,
+ .open = fpga_device_open,
+ .release = fpga_device_release,
+ .unlocked_ioctl = fpga_device_ioctl,
+ .compat_ioctl = fpga_device_ioctl,
+};
+
/**
* fpga_mgr_create - create and initialize a FPGA manager struct
* @dev: fpga manager device from pdev
@@ -569,8 +674,7 @@ struct fpga_manager *fpga_mgr_create(struct device *dev, const char *name,
int id, ret;
if (!mops || !mops->write_complete || !mops->state ||
- !mops->write_init || (!mops->write && !mops->write_sg) ||
- (mops->write && mops->write_sg)) {
+ !mops->write_init || (!mops->write && !mops->write_sg)) {
dev_err(dev, "Attempt to register without fpga_manager_ops\n");
return NULL;
}
@@ -601,10 +705,28 @@ struct fpga_manager *fpga_mgr_create(struct device *dev, const char *name,
mgr->dev.of_node = dev->of_node;
mgr->dev.id = id;
+ /* Make device dma capable by inheriting from parent's */
+ set_dma_ops(&mgr->dev, get_dma_ops(dev));
+ ret = dma_coerce_mask_and_coherent(&mgr->dev, dma_get_mask(dev));
+ if (ret) {
+ dev_warn(dev,
+ "Failed to set DMA mask %llx.Trying to continue.%x\n",
+ dma_get_mask(dev), ret);
+ }
+
ret = dev_set_name(&mgr->dev, "fpga%d", id);
if (ret)
goto error_device;
+ mgr->miscdev.minor = MISC_DYNAMIC_MINOR;
+ mgr->miscdev.name = kobject_name(&mgr->dev.kobj);
+ mgr->miscdev.fops = &fpga_fops;
+ ret = misc_register(&mgr->miscdev);
+ if (ret) {
+ pr_err("fpga: failed to register misc device.\n");
+ goto error_device;
+ }
+
return mgr;
error_device:
diff --git a/drivers/fpga/of-fpga-region.c b/drivers/fpga/of-fpga-region.c
index 35fc2f3d4bd8..698e3e42ccba 100644
--- a/drivers/fpga/of-fpga-region.c
+++ b/drivers/fpga/of-fpga-region.c
@@ -229,6 +229,9 @@ static struct fpga_image_info *of_fpga_region_parse_ov(
if (of_property_read_bool(overlay, "encrypted-fpga-config"))
info->flags |= FPGA_MGR_ENCRYPTED_BITSTREAM;
+ if (of_property_read_bool(overlay, "fpga-config-from-dmabuf"))
+ info->flags |= FPGA_MGR_CONFIG_DMA_BUF;
+
if (!of_property_read_string(overlay, "firmware-name",
&firmware_name)) {
info->firmware_name = devm_kstrdup(dev, firmware_name,
diff --git a/include/linux/fpga/fpga-mgr.h b/include/linux/fpga/fpga-mgr.h
index 2bc3030a69e5..6208c22f7bed 100644
--- a/include/linux/fpga/fpga-mgr.h
+++ b/include/linux/fpga/fpga-mgr.h
@@ -9,6 +9,7 @@
#define _LINUX_FPGA_MGR_H
#include <linux/mutex.h>
+#include <linux/miscdevice.h>
#include <linux/platform_device.h>
struct fpga_manager;
@@ -73,7 +74,7 @@ enum fpga_mgr_states {
#define FPGA_MGR_ENCRYPTED_BITSTREAM BIT(2)
#define FPGA_MGR_BITSTREAM_LSB_FIRST BIT(3)
#define FPGA_MGR_COMPRESSED_BITSTREAM BIT(4)
-
+#define FPGA_MGR_CONFIG_DMA_BUF BIT(5)
/**
* struct fpga_image_info - information specific to a FPGA image
* @flags: boolean flags as defined above
@@ -167,6 +168,8 @@ struct fpga_compat_id {
struct fpga_manager {
const char *name;
struct device dev;
+ struct miscdevice miscdev;
+ struct dma_buf *dmabuf;
struct mutex ref_mutex;
enum fpga_mgr_states state;
struct fpga_compat_id *compat_id;
@@ -204,4 +207,5 @@ struct fpga_manager *devm_fpga_mgr_create(struct device *dev, const char *name,
const struct fpga_manager_ops *mops,
void *priv);
+#define FPGA_IOCTL_LOAD_DMA_BUFF _IOWR('R', 1, __u32)
#endif /*_LINUX_FPGA_MGR_H */
