linux-kernel - [RFC PATCH v2 1/6] remoteproc: core: Introduce virtio device add/remove functions

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Date:   Wed, 22 Dec 2021 09:23:44 +0100
From:   Arnaud Pouliquen <arnaud.pouliquen@...s.st.com>
To:     Bjorn Andersson <bjorn.andersson@...aro.org>,
        Mathieu Poirier <mathieu.poirier@...aro.org>
CC:     <linux-remoteproc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-stm32@...md-mailman.stormreply.com>,
        <arnaud.pouliquen@...s.st.com>
Subject: [RFC PATCH v2 1/6] remoteproc: core: Introduce virtio device add/remove functions

In preparation of the migration of the management of rvdev in
remoteproc_virtio.c, this patch spins off new functions to manage the
remoteproc virtio device.

The rproc_rvdev_add_device and rproc_rvdev_remove_device will be
moved to remoteproc_virtio.c.

Signed-off-by: Arnaud Pouliquen <arnaud.pouliquen@...s.st.com>
---
update vs previous revision:
 - update according to the rebase from v15-rc1 to v16-rc1
 - split patch to introduce rproc_register_rvdev and rproc_unregister_rvdev
   function in a separate patch
---
 drivers/remoteproc/remoteproc_core.c | 94 +++++++++++++++++-----------
 1 file changed, 57 insertions(+), 37 deletions(-)

diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c
index 69f51acf235e..d1f1c5c25bd7 100644
--- a/drivers/remoteproc/remoteproc_core.c
+++ b/drivers/remoteproc/remoteproc_core.c
@@ -484,6 +484,61 @@ static int copy_dma_range_map(struct device *to, struct device *from)
 	return 0;
 }
 
+static int rproc_rvdev_add_device(struct rproc_vdev *rvdev)
+{
+	struct rproc *rproc = rvdev->rproc;
+	char name[16];
+	int ret;
+
+	snprintf(name, sizeof(name), "vdev%dbuffer", rvdev->index);
+	rvdev->dev.parent = &rproc->dev;
+	rvdev->dev.release = rproc_rvdev_release;
+	dev_set_name(&rvdev->dev, "%s#%s", dev_name(rvdev->dev.parent), name);
+	dev_set_drvdata(&rvdev->dev, rvdev);
+
+	ret = device_register(&rvdev->dev);
+	if (ret) {
+		put_device(&rvdev->dev);
+		return ret;
+	}
+	ret = copy_dma_range_map(&rvdev->dev, rproc->dev.parent);
+	if (ret)
+		goto free_rvdev;
+
+	/* Make device dma capable by inheriting from parent's capabilities */
+	set_dma_ops(&rvdev->dev, get_dma_ops(rproc->dev.parent));
+
+	ret = dma_coerce_mask_and_coherent(&rvdev->dev,
+					   dma_get_mask(rproc->dev.parent));
+	if (ret) {
+		dev_warn(&rvdev->dev,
+			 "Failed to set DMA mask %llx. Trying to continue... (%pe)\n",
+			 dma_get_mask(rproc->dev.parent), ERR_PTR(ret));
+	}
+
+	list_add_tail(&rvdev->node, &rproc->rvdevs);
+
+	rvdev->subdev.start = rproc_vdev_do_start;
+	rvdev->subdev.stop = rproc_vdev_do_stop;
+
+	rproc_add_subdev(rproc, &rvdev->subdev);
+
+	return 0;
+
+free_rvdev:
+	device_unregister(&rvdev->dev);
+	return ret;
+}
+
+static void rproc_rvdev_remove_device(struct rproc_vdev *rvdev)
+{
+	struct rproc *rproc = rvdev->rproc;
+
+	rproc_remove_subdev(rproc, &rvdev->subdev);
+	list_del(&rvdev->node);
+	device_unregister(&rvdev->dev);
+}
+
 /**
  * rproc_handle_vdev() - handle a vdev fw resource
  * @rproc: the remote processor
@@ -519,7 +574,6 @@ static int rproc_handle_vdev(struct rproc *rproc, void *ptr,
 	struct device *dev = &rproc->dev;
 	struct rproc_vdev *rvdev;
 	int i, ret;
-	char name[16];
 
 	/* make sure resource isn't truncated */
 	if (struct_size(rsc, vring, rsc->num_of_vrings) + rsc->config_len >
@@ -553,34 +607,10 @@ static int rproc_handle_vdev(struct rproc *rproc, void *ptr,
 	rvdev->rproc = rproc;
 	rvdev->index = rproc->nb_vdev++;
 
-	/* Initialise vdev subdevice */
-	snprintf(name, sizeof(name), "vdev%dbuffer", rvdev->index);
-	rvdev->dev.parent = &rproc->dev;
-	rvdev->dev.release = rproc_rvdev_release;
-	dev_set_name(&rvdev->dev, "%s#%s", dev_name(rvdev->dev.parent), name);
-	dev_set_drvdata(&rvdev->dev, rvdev);
-
-	ret = device_register(&rvdev->dev);
-	if (ret) {
-		put_device(&rvdev->dev);
-		return ret;
-	}
-
-	ret = copy_dma_range_map(&rvdev->dev, rproc->dev.parent);
+	ret = rproc_rvdev_add_device(rvdev);
 	if (ret)
 		goto free_rvdev;
 
-	/* Make device dma capable by inheriting from parent's capabilities */
-	set_dma_ops(&rvdev->dev, get_dma_ops(rproc->dev.parent));
-
-	ret = dma_coerce_mask_and_coherent(&rvdev->dev,
-					   dma_get_mask(rproc->dev.parent));
-	if (ret) {
-		dev_warn(dev,
-			 "Failed to set DMA mask %llx. Trying to continue... (%pe)\n",
-			 dma_get_mask(rproc->dev.parent), ERR_PTR(ret));
-	}
-
 	/* parse the vrings */
 	for (i = 0; i < rsc->num_of_vrings; i++) {
 		ret = rproc_parse_vring(rvdev, rsc, i);
@@ -598,13 +628,6 @@ static int rproc_handle_vdev(struct rproc *rproc, void *ptr,
 			goto unwind_vring_allocations;
 	}
 
-	list_add_tail(&rvdev->node, &rproc->rvdevs);
-
-	rvdev->subdev.start = rproc_vdev_do_start;
-	rvdev->subdev.stop = rproc_vdev_do_stop;
-
-	rproc_add_subdev(rproc, &rvdev->subdev);
-
 	return 0;
 
 unwind_vring_allocations:
@@ -619,7 +642,6 @@ void rproc_vdev_release(struct kref *ref)
 {
 	struct rproc_vdev *rvdev = container_of(ref, struct rproc_vdev, refcount);
 	struct rproc_vring *rvring;
-	struct rproc *rproc = rvdev->rproc;
 	int id;
 
 	for (id = 0; id < ARRAY_SIZE(rvdev->vring); id++) {
@@ -627,9 +649,7 @@ void rproc_vdev_release(struct kref *ref)
 		rproc_free_vring(rvring);
 	}
 
-	rproc_remove_subdev(rproc, &rvdev->subdev);
-	list_del(&rvdev->node);
-	device_unregister(&rvdev->dev);
+	rproc_rvdev_remove_device(rvdev);
 }
 
 /**
-- 
2.17.1