remoteproc: remove the single rpmsg vdev limitation

Now that the resource table supports publishing a virtio device
in a single resource entry, firmware images can start supporting
more than a single vdev.

This patch removes the single vdev limitation of the remoteproc
framework so multi-vdev firmwares can be leveraged: VDEV resource
entries are parsed when the rproc is registered, and as a result
their vrings are set up and the virtio devices are registered
(and they go away when the rproc goes away).

Moreover, we no longer only support VIRTIO_ID_RPMSG vdevs; any
virtio device type goes now. As a result, there's no more any
rpmsg-specific APIs or code in remoteproc: it all becomes generic
virtio handling.

Signed-off-by: Ohad Ben-Cohen <ohad@wizery.com>
Cc: Brian Swetland <swetland@google.com>
Cc: Iliyan Malchev <malchev@google.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Grant Likely <grant.likely@secretlab.ca>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Mark Grosen <mgrosen@ti.com>
Cc: John Williams <john.williams@petalogix.com>
Cc: Michal Simek <monstr@monstr.eu>
Cc: Loic PALLARDY <loic.pallardy@stericsson.com>
Cc: Ludovic BARRE <ludovic.barre@stericsson.com>
Cc: Omar Ramirez Luna <omar.luna@linaro.org>
Cc: Guzman Lugo Fernando <fernando.lugo@ti.com>
Cc: Anna Suman <s-anna@ti.com>
Cc: Clark Rob <rob@ti.com>
Cc: Stephen Boyd <sboyd@codeaurora.org>
Cc: Saravana Kannan <skannan@codeaurora.org>
Cc: David Brown <davidb@codeaurora.org>
Cc: Kieran Bingham <kieranbingham@gmail.com>
Cc: Tony Lindgren <tony@atomide.com>

1 files changed, 36 insertions, 5 deletions

diff --git a/include/linux/remoteproc.h b/include/linux/remoteproc.h
index 6040f831f626..7750d8a30933 100644
--- a/include/linux/remoteproc.h
+++ b/include/linux/remoteproc.h
@@ -41,6 +41,7 @@
 #include <linux/mutex.h>
 #include <linux/virtio.h>
 #include <linux/completion.h>
+#include <linux/idr.h>
 
 /*
  * The alignment between the consumer and producer parts of the vring.
@@ -387,7 +388,8 @@ enum rproc_state {
  * @mappings: list of iommu mappings we initiated, needed on shutdown
  * @firmware_loading_complete: marks e/o asynchronous firmware loading
  * @bootaddr: address of first instruction to boot rproc with (optional)
- * @rvdev: virtio device (we only support a single rpmsg virtio device for now)
+ * @rvdevs: list of remote virtio devices
+ * @notifyids: idr for dynamically assigning rproc-wide unique notify ids
  */
 struct rproc {
 	struct klist_node node;
@@ -408,23 +410,47 @@ struct rproc {
 	struct list_head mappings;
 	struct completion firmware_loading_complete;
 	u32 bootaddr;
+	struct list_head rvdevs;
+	struct idr notifyids;
+};
+
+/* we currently support only two vrings per rvdev */
+#define RVDEV_NUM_VRINGS 2
+
+/**
+ * struct rproc_vring - remoteproc vring state
+ * @va:	virtual address
+ * @dma: dma address
+ * @len: length, in bytes
+ * @da: device address
+ * @notifyid: rproc-specific unique vring index
+ * @rvdev: remote vdev
+ * @vq: the virtqueue of this vring
+ */
+struct rproc_vring {
+	void *va;
+	dma_addr_t dma;
+	int len;
+	u32 da;
+	int notifyid;
 	struct rproc_vdev *rvdev;
+	struct virtqueue *vq;
 };
 
 /**
  * struct rproc_vdev - remoteproc state for a supported virtio device
+ * @node: list node
  * @rproc: the rproc handle
  * @vdev: the virio device
- * @vq: the virtqueues for this vdev
  * @vring: the vrings for this vdev
  * @dfeatures: virtio device features
  * @gfeatures: virtio guest features
  */
 struct rproc_vdev {
+	struct list_head node;
 	struct rproc *rproc;
 	struct virtio_device vdev;
-	struct virtqueue *vq[2];
-	struct rproc_mem_entry vring[2];
+	struct rproc_vring vring[RVDEV_NUM_VRINGS];
 	unsigned long dfeatures;
 	unsigned long gfeatures;
 };
@@ -442,9 +468,14 @@ int rproc_unregister(struct rproc *rproc);
 int rproc_boot(struct rproc *rproc);
 void rproc_shutdown(struct rproc *rproc);
 
+static inline struct rproc_vdev *vdev_to_rvdev(struct virtio_device *vdev)
+{
+	return container_of(vdev, struct rproc_vdev, vdev);
+}
+
 static inline struct rproc *vdev_to_rproc(struct virtio_device *vdev)
 {
-	struct rproc_vdev *rvdev = container_of(vdev, struct rproc_vdev, vdev);
+	struct rproc_vdev *rvdev = vdev_to_rvdev(vdev);
 
 	return rvdev->rproc;
 }