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Subject[RFC PATCH 7/7] remoteproc: Instantiate the new remoteproc virtio platform device
Date
Migrate from the rvdev device to the rvdev platform device.
From this patch, when a vdev resource is found in the resource table
the remoteproc core register a platform device.

All reference to the rvdev->dev has been updated to rvdev-pdev->dev

The use of kref counter is replaced by get/put_device on the remoteproc
virtio device.

Signed-off-by: Arnaud Pouliquen <arnaud.pouliquen@foss.st.com>
---
drivers/remoteproc/remoteproc_core.c | 49 +++++++------
drivers/remoteproc/remoteproc_internal.h | 16 ----
drivers/remoteproc/remoteproc_virtio.c | 93 ++++++------------------
include/linux/remoteproc.h | 4 -
4 files changed, 50 insertions(+), 112 deletions(-)

diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c
index 67ccd088db8f..d9256db8b130 100644
--- a/drivers/remoteproc/remoteproc_core.c
+++ b/drivers/remoteproc/remoteproc_core.c
@@ -467,6 +467,8 @@ static int rproc_handle_vdev(struct rproc *rproc, void *ptr,
{
struct fw_rsc_vdev *rsc = ptr;
struct device *dev = &rproc->dev;
+ struct rproc_vdev_data vdev_data;
+ struct platform_device *pdev;
struct rproc_vdev *rvdev;
int i, ret;

@@ -486,28 +488,34 @@ static int rproc_handle_vdev(struct rproc *rproc, void *ptr,
dev_dbg(dev, "vdev rsc: id %d, dfeatures 0x%x, cfg len %d, %d vrings\n",
rsc->id, rsc->dfeatures, rsc->config_len, rsc->num_of_vrings);

- /* we currently support only two vrings per rvdev */
- if (rsc->num_of_vrings > ARRAY_SIZE(rvdev->vring)) {
- dev_err(dev, "too many vrings: %d\n", rsc->num_of_vrings);
- return -EINVAL;
- }
+ /* platform data of the new rvdev platform */
+ vdev_data.rsc_offset = offset;
+ vdev_data.id = rsc->id;
+ vdev_data.index = rproc->nb_vdev;

- rvdev = kzalloc(sizeof(*rvdev), GFP_KERNEL);
- if (!rvdev)
- return -ENOMEM;
-
- kref_init(&rvdev->refcount);
-
- rvdev->id = rsc->id;
- rvdev->rproc = rproc;
- rvdev->index = rproc->nb_vdev;
+ pdev = rproc_virtio_register_device(rproc, &vdev_data);
+ if (PTR_ERR_OR_ZERO(pdev)) {
+ dev_err(rproc->dev.parent,
+ "failed to create rproc-virtio device\n");
+ return PTR_ERR_OR_ZERO(pdev);
+ }

- ret = rproc_rvdev_add_device(rvdev);
- if (ret)
- return ret;
+ /* If we made it to this point the remote proc virtio platform at been probed */
+ rvdev = platform_get_drvdata(pdev);
+ if (WARN_ON(!rvdev)) {
+ ret = -EINVAL;
+ goto free_rvdev;
+ }

rproc->nb_vdev++;

+ /* we currently support only two vrings per rvdev */
+ if (rsc->num_of_vrings > ARRAY_SIZE(rvdev->vring)) {
+ dev_err(dev, "too many vrings: %d\n", rsc->num_of_vrings);
+ ret = -EINVAL;
+ goto free_rvdev;
+ }
+
/* parse the vrings */
for (i = 0; i < rsc->num_of_vrings; i++) {
ret = rproc_parse_vring(rvdev, rsc, i);
@@ -515,9 +523,6 @@ static int rproc_handle_vdev(struct rproc *rproc, void *ptr,
goto free_rvdev;
}

- /* remember the resource offset*/
- rvdev->rsc_offset = offset;
-
/* allocate the vring resources */
for (i = 0; i < rsc->num_of_vrings; i++) {
ret = rproc_alloc_vring(rvdev, i);
@@ -531,7 +536,7 @@ static int rproc_handle_vdev(struct rproc *rproc, void *ptr,
for (i--; i >= 0; i--)
rproc_free_vring(&rvdev->vring[i]);
free_rvdev:
- device_unregister(&rvdev->dev);
+ rproc_virtio_unregister_device(rvdev);
return ret;
}

@@ -1270,7 +1275,7 @@ void rproc_resource_cleanup(struct rproc *rproc)

/* clean up remote vdev entries */
list_for_each_entry_safe(rvdev, rvtmp, &rproc->rvdevs, node)
- kref_put(&rvdev->refcount, rproc_vdev_release);
+ rproc_virtio_unregister_device(rvdev);

rproc_coredump_cleanup(rproc);
}
diff --git a/drivers/remoteproc/remoteproc_internal.h b/drivers/remoteproc/remoteproc_internal.h
index 0bb1b14e5136..2f68e7380c77 100644
--- a/drivers/remoteproc/remoteproc_internal.h
+++ b/drivers/remoteproc/remoteproc_internal.h
@@ -38,12 +38,10 @@ int rproc_of_parse_firmware(struct device *dev, int index,
/* from remoteproc_virtio.c */
#if IS_ENABLED(CONFIG_REMOTEPROC_VIRTIO)

-int rproc_rvdev_add_device(struct rproc_vdev *rvdev);
struct platform_device *
rproc_virtio_register_device(struct rproc *rproc, struct rproc_vdev_data *vdev_data);
void rproc_virtio_unregister_device(struct rproc_vdev *rvdev);
irqreturn_t rproc_vq_interrupt(struct rproc *rproc, int vq_id);
-void rproc_vdev_release(struct kref *ref);

#else

@@ -59,14 +57,6 @@ static inline void rproc_virtio_unregister_device(struct rproc_vdev *rvdev)
WARN_ON(1);
}

-int rproc_rvdev_add_device(struct rproc_vdev *rvdev)
-{
- /* This shouldn't be possible */
- WARN_ON(1);
-
- return -ENXIO;
-}
-
static inline irqreturn_t rproc_vq_interrupt(struct rproc *rproc, int vq_id)
{
/* This shouldn't be possible */
@@ -75,12 +65,6 @@ static inline irqreturn_t rproc_vq_interrupt(struct rproc *rproc, int vq_id)
return IRQ_NONE;
}

-static inline void rproc_vdev_release(struct kref *ref)
-{
- /* This shouldn't be possible */
- WARN_ON(1);
-}
-
#endif

/* from remoteproc_debugfs.c */
diff --git a/drivers/remoteproc/remoteproc_virtio.c b/drivers/remoteproc/remoteproc_virtio.c
index 7188fb8ce40f..34781a2136e6 100644
--- a/drivers/remoteproc/remoteproc_virtio.c
+++ b/drivers/remoteproc/remoteproc_virtio.c
@@ -29,7 +29,11 @@

static struct rproc_vdev *vdev_to_rvdev(struct virtio_device *vdev)
{
- return container_of(vdev->dev.parent, struct rproc_vdev, dev);
+ struct platform_device *pdev;
+
+ pdev = container_of(vdev->dev.parent, struct platform_device, dev);
+
+ return platform_get_drvdata(pdev);
}

static struct rproc *vdev_to_rproc(struct virtio_device *vdev)
@@ -343,13 +347,10 @@ static void rproc_virtio_dev_release(struct device *dev)
{
struct virtio_device *vdev = dev_to_virtio(dev);
struct rproc_vdev *rvdev = vdev_to_rvdev(vdev);
- struct rproc *rproc = vdev_to_rproc(vdev);

kfree(vdev);

- kref_put(&rvdev->refcount, rproc_vdev_release);
-
- put_device(&rproc->dev);
+ put_device(&rvdev->pdev->dev);
}

/**
@@ -365,7 +366,7 @@ static void rproc_virtio_dev_release(struct device *dev)
static int rproc_add_virtio_dev(struct rproc_vdev *rvdev, int id)
{
struct rproc *rproc = rvdev->rproc;
- struct device *dev = &rvdev->dev;
+ struct device *dev = &rvdev->pdev->dev;
struct virtio_device *vdev;
struct rproc_mem_entry *mem;
int ret;
@@ -436,17 +437,15 @@ static int rproc_add_virtio_dev(struct rproc_vdev *rvdev, int id)
vdev->dev.release = rproc_virtio_dev_release;

/*
- * We're indirectly making a non-temporary copy of the rproc pointer
+ * We're indirectly making a non-temporary copy of the rvdev pointer
* here, because drivers probed with this vdev will indirectly
* access the wrapping rproc.
*
- * Therefore we must increment the rproc refcount here, and decrement
+ * Therefore we must increment the rvdev refcount here, and decrement
* it _only_ when the vdev is released.
*/
- get_device(&rproc->dev);
+ get_device(dev);

- /* Reference the vdev and vring allocations */
- kref_get(&rvdev->refcount);

ret = register_virtio_device(vdev);
if (ret) {
@@ -488,57 +487,33 @@ static int rproc_vdev_do_start(struct rproc_subdev *subdev)
static void rproc_vdev_do_stop(struct rproc_subdev *subdev, bool crashed)
{
struct rproc_vdev *rvdev = container_of(subdev, struct rproc_vdev, subdev);
+ struct device *dev = &rvdev->pdev->dev;
int ret;

- ret = device_for_each_child(&rvdev->dev, NULL, rproc_remove_virtio_dev);
+ ret = device_for_each_child(dev, NULL, rproc_remove_virtio_dev);
if (ret)
- dev_warn(&rvdev->dev, "can't remove vdev child device: %d\n", ret);
-}
-
-/**
- * rproc_rvdev_release() - release the existence of a rvdev
- *
- * @dev: the subdevice's dev
- */
-static void rproc_rvdev_release(struct device *dev)
-{
- struct rproc_vdev *rvdev = container_of(dev, struct rproc_vdev, dev);
-
- of_reserved_mem_device_release(dev);
-
- kfree(rvdev);
+ dev_warn(dev, "can't remove vdev child device: %d\n", ret);
}

-int rproc_rvdev_add_device(struct rproc_vdev *rvdev)
+static int rproc_rvdev_add_device(struct rproc_vdev *rvdev)
{
struct rproc *rproc = rvdev->rproc;
- char name[16];
+ struct device *dev = &rvdev->pdev->dev;
int ret;

- snprintf(name, sizeof(name), "vdev%dbuffer", rvdev->index);
- rvdev->dev.parent = &rproc->dev;
- ret = copy_dma_range_map(&rvdev->dev, rproc->dev.parent);
+ ret = copy_dma_range_map(dev, rproc->dev.parent);
if (ret)
return ret;

- 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;
- }
/* Make device dma capable by inheriting from parent's capabilities */
- set_dma_ops(&rvdev->dev, get_dma_ops(rproc->dev.parent));
+ set_dma_ops(dev, get_dma_ops(rproc->dev.parent));

- ret = dma_coerce_mask_and_coherent(&rvdev->dev,
- dma_get_mask(rproc->dev.parent));
+ ret = dma_coerce_mask_and_coherent(dev, dma_get_mask(rproc->dev.parent));
if (ret) {
- dev_warn(&rvdev->dev,
- "Failed to set DMA mask %llx. Trying to continue... %x\n",
+ dev_warn(dev, "Failed to set DMA mask %llx. Trying to continue... %x\n",
dma_get_mask(rproc->dev.parent), ret);
+ return ret;
}

rproc_register_rvdev(rvdev);
@@ -548,30 +523,9 @@ int rproc_rvdev_add_device(struct rproc_vdev *rvdev)

rproc_add_subdev(rproc, &rvdev->subdev);

- return 0;
-}
-
-static void rproc_rvdev_remove_device(struct rproc_vdev *rvdev)
-{
- struct rproc *rproc = rvdev->rproc;
-
- rproc_remove_subdev(rproc, &rvdev->subdev);
- rproc_unregister_rvdev(rvdev);
- device_unregister(&rvdev->dev);
-}
-
-void rproc_vdev_release(struct kref *ref)
-{
- struct rproc_vdev *rvdev = container_of(ref, struct rproc_vdev, refcount);
- struct rproc_vring *rvring;
- int id;
+ dev_dbg(dev, "virtio dev %d added\n", rvdev->index);

- for (id = 0; id < ARRAY_SIZE(rvdev->vring); id++) {
- rvring = &rvdev->vring[id];
- rproc_free_vring(rvring);
- }
-
- rproc_rvdev_remove_device(rvdev);
+ return 0;
}

/**
@@ -590,8 +544,7 @@ rproc_virtio_register_device(struct rproc *rproc, struct rproc_vdev_data *vdev_d
pdev = platform_device_register_data(dev, "rproc-virtio", vdev_data->index, vdev_data,
sizeof(*vdev_data));
if (PTR_ERR_OR_ZERO(pdev)) {
- dev_err(rproc->dev.parent,
- "failed to create rproc-virtio device\n");
+ dev_err(rproc->dev.parent, "failed to create rproc-virtio device\n");
}

return pdev;
diff --git a/include/linux/remoteproc.h b/include/linux/remoteproc.h
index 542a3d4664f2..7951a3e2b62a 100644
--- a/include/linux/remoteproc.h
+++ b/include/linux/remoteproc.h
@@ -614,10 +614,8 @@ struct rproc_vring {

/**
* struct rproc_vdev - remoteproc state for a supported virtio device
- * @refcount: reference counter for the vdev and vring allocations
* @subdev: handle for registering the vdev as a rproc subdevice
* @pdev: remoteproc virtio platform device
- * @dev: device struct used for reference count semantics
* @id: virtio device id (as in virtio_ids.h)
* @node: list node
* @rproc: the rproc handle
@@ -626,11 +624,9 @@ struct rproc_vring {
* @index: vdev position versus other vdev declared in resource table
*/
struct rproc_vdev {
- struct kref refcount;

struct rproc_subdev subdev;
struct platform_device *pdev;
- struct device dev;

unsigned int id;
struct list_head node;
--
2.17.1
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