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remoteproc: virtio: Create platform device for the remoteproc_virtio

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Define a platform driver to manage the remoteproc virtio device as
a platform devices.

The platform device allows to pass rproc_vdev_data platform data to
specify properties that are stored in the rproc_vdev structure.

Such approach will allow to preserve legacy remoteproc virtio device
creation but also to probe the device using device tree mechanism.

remoteproc_virtio.c update:
  - Add rproc_virtio_driver platform driver. The probe ops replaces
    the rproc_rvdev_add_device function.
  - All reference to the rvdev->dev has been updated to rvdev-pdev->dev.
  - rproc_rvdev_release is removed as associated to the rvdev device.
  - The use of rvdev->kref counter is replaced by get/put_device on the
    remoteproc virtio platform device.
  - The vdev device no longer increments rproc device counter.
    increment/decrement is done in rproc_virtio_probe/rproc_virtio_remove
    function in charge of the vrings allocation/free.

remoteproc_core.c update:
  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.

Signed-off-by: Arnaud Pouliquen <arnaud.pouliquen@foss.st.com>
Link: https://lore.kernel.org/r/20220921135044.917140-5-arnaud.pouliquen@foss.st.com
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
This commit is contained in:
Arnaud Pouliquen 2022-09-21 15:50:44 +02:00 committed by Mathieu Poirier
parent 9c31255ce5
commit 1d7b61c06d
4 changed files with 82 additions and 81 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

12
drivers/remoteproc/remoteproc_core.c
View file

@ -480,6 +480,7 @@ static int rproc_handle_vdev(struct rproc *rproc, void *ptr,
struct rproc_vdev *rvdev;
size_t rsc_size;
struct rproc_vdev_data rvdev_data;
struct platform_device *pdev;
/* make sure resource isn't truncated */
rsc_size = struct_size(rsc, vring, rsc->num_of_vrings);
@ -508,9 +509,12 @@ static int rproc_handle_vdev(struct rproc *rproc, void *ptr,
rvdev_data.rsc_offset = offset;
rvdev_data.rsc = rsc;
rvdev = rproc_rvdev_add_device(rproc, &rvdev_data);
if (IS_ERR(rvdev))
return PTR_ERR(rvdev);
pdev = platform_device_register_data(dev, "rproc-virtio", rvdev_data.index, &rvdev_data,
sizeof(rvdev_data));
if (IS_ERR(pdev)) {
dev_err(dev, "failed to create rproc-virtio device\n");
return PTR_ERR(pdev);
}
return 0;
}
@ -1246,7 +1250,7 @@ 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);
platform_device_unregister(rvdev->pdev);
rproc_coredump_cleanup(rproc);
}

2
drivers/remoteproc/remoteproc_internal.h
View file

@ -45,9 +45,7 @@ int rproc_of_parse_firmware(struct device *dev, int index,
const char **fw_name);
/* from remoteproc_virtio.c */
struct rproc_vdev *rproc_rvdev_add_device(struct rproc *rproc, struct rproc_vdev_data *rvdev_data);
irqreturn_t rproc_vq_interrupt(struct rproc *rproc, int vq_id);
void rproc_vdev_release(struct kref *ref);
/* from remoteproc_debugfs.c */
void rproc_remove_trace_file(struct dentry *tfile);

143
drivers/remoteproc/remoteproc_virtio.c
View file

@ -13,6 +13,7 @@
#include <linux/dma-map-ops.h>
#include <linux/dma-mapping.h>
#include <linux/export.h>
#include <linux/of_platform.h>
#include <linux/of_reserved_mem.h>
#include <linux/remoteproc.h>
#include <linux/virtio.h>
@ -46,7 +47,11 @@ static int copy_dma_range_map(struct device *to, struct device *from)
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 +348,10 @@ 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 +367,7 @@ 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;
@ -435,18 +437,8 @@ static int rproc_add_virtio_dev(struct rproc_vdev *rvdev, int id)
vdev->dev.parent = dev;
vdev->dev.release = rproc_virtio_dev_release;
/*
* We're indirectly making a non-temporary copy of the rproc pointer
* here, because drivers probed with this vdev will indirectly
* access the wrapping rproc.
*
* Therefore we must increment the rproc refcount here, and decrement
* it _only_ when the vdev is released.
*/
get_device(&rproc->dev);
/* Reference the vdev and vring allocations */
kref_get(&rvdev->refcount);
get_device(dev);
ret = register_virtio_device(vdev);
if (ret) {
@ -488,79 +480,57 @@ 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);
dev_warn(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);
dma_release_coherent_memory(dev);
kfree(rvdev);
}
struct rproc_vdev *
rproc_rvdev_add_device(struct rproc *rproc, struct rproc_vdev_data *rvdev_data)
static int rproc_virtio_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct rproc_vdev_data *rvdev_data = dev->platform_data;
struct rproc_vdev *rvdev;
struct fw_rsc_vdev *rsc = rvdev_data->rsc;
char name[16];
struct rproc *rproc = container_of(dev->parent, struct rproc, dev);
struct fw_rsc_vdev *rsc;
int i, ret;
rvdev = kzalloc(sizeof(*rvdev), GFP_KERNEL);
if (!rvdev)
return ERR_PTR(-ENOMEM);
if (!rvdev_data)
return -EINVAL;
kref_init(&rvdev->refcount);
rvdev = devm_kzalloc(dev, sizeof(*rvdev), GFP_KERNEL);
if (!rvdev)
return -ENOMEM;
rvdev->id = rvdev_data->id;
rvdev->rproc = rproc;
rvdev->index = rvdev_data->index;
/* 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 ERR_PTR(ret);
}
ret = copy_dma_range_map(&rvdev->dev, rproc->dev.parent);
ret = copy_dma_range_map(dev, rproc->dev.parent);
if (ret)
goto free_rvdev;
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... (%pe)\n",
dev_warn(dev, "Failed to set DMA mask %llx. Trying to continue... (%pe)\n",
dma_get_mask(rproc->dev.parent), ERR_PTR(ret));
}
platform_set_drvdata(pdev, rvdev);
rvdev->pdev = pdev;
rsc = rvdev_data->rsc;
/* parse the vrings */
for (i = 0; i < rsc->num_of_vrings; i++) {
ret = rproc_parse_vring(rvdev, rsc, i);
if (ret)
goto free_rvdev;
return ret;
}
/* remember the resource offset*/
@ -580,21 +550,30 @@ rproc_rvdev_add_device(struct rproc *rproc, struct rproc_vdev_data *rvdev_data)
rproc_add_subdev(rproc, &rvdev->subdev);
return rvdev;
/*
* We're indirectly making a non-temporary copy of the rproc pointer
* here, because the platform device or the vdev device will indirectly
* access the wrapping rproc.
*
* Therefore we must increment the rproc refcount here, and decrement
* it _only_ on platform remove.
*/
get_device(&rproc->dev);
return 0;
unwind_vring_allocations:
for (i--; i >= 0; i--)
rproc_free_vring(&rvdev->vring[i]);
free_rvdev:
device_unregister(&rvdev->dev);
return ERR_PTR(ret);
return ret;
}
void rproc_vdev_release(struct kref *ref)
static int rproc_virtio_remove(struct platform_device *pdev)
{
struct rproc_vdev *rvdev = container_of(ref, struct rproc_vdev, refcount);
struct rproc_vring *rvring;
struct rproc_vdev *rvdev = dev_get_drvdata(&pdev->dev);
struct rproc *rproc = rvdev->rproc;
struct rproc_vring *rvring;
int id;
for (id = 0; id < ARRAY_SIZE(rvdev->vring); id++) {
@ -604,5 +583,27 @@ void rproc_vdev_release(struct kref *ref)
rproc_remove_subdev(rproc, &rvdev->subdev);
rproc_remove_rvdev(rvdev);
device_unregister(&rvdev->dev);
of_reserved_mem_device_release(&pdev->dev);
dma_release_coherent_memory(&pdev->dev);
put_device(&rproc->dev);
return 0;
}
/* Platform driver */
static const struct of_device_id rproc_virtio_match[] = {
{ .compatible = "virtio,rproc" },
{},
};
static struct platform_driver rproc_virtio_driver = {
.probe = rproc_virtio_probe,
.remove = rproc_virtio_remove,
.driver = {
.name = "rproc-virtio",
.of_match_table = rproc_virtio_match,
},
};
builtin_platform_driver(rproc_virtio_driver);

6
include/linux/remoteproc.h
View file

@ -616,9 +616,8 @@ 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
* @dev: device struct used for reference count semantics
* @pdev: remoteproc virtio platform device
* @id: virtio device id (as in virtio_ids.h)
* @node: list node
* @rproc: the rproc handle
@ -627,10 +626,9 @@ struct rproc_vring {
* @index: vdev position versus other vdev declared in resource table
*/
struct rproc_vdev {
struct kref refcount;
struct rproc_subdev subdev;
struct device dev;
struct platform_device *pdev;
unsigned int id;
struct list_head node;