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/remove ops replace
the rproc_rvdev_add_device/rproc_rvdev_remove_device functions.
- 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 <[email protected]>
---
Update vs previous revision:
- Updated the compatible name to align with the "virtio, <transport>"
name used for instance for "virtio,mmio"
---
drivers/remoteproc/remoteproc_core.c | 13 +-
drivers/remoteproc/remoteproc_internal.h | 3 -
drivers/remoteproc/remoteproc_virtio.c | 146 +++++++++++------------
include/linux/remoteproc.h | 6 +-
4 files changed, 84 insertions(+), 84 deletions(-)
diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c
index bd6d3f2decc6..c0c88ecaa66e 100644
--- a/drivers/remoteproc/remoteproc_core.c
+++ b/drivers/remoteproc/remoteproc_core.c
@@ -478,6 +478,7 @@ static int rproc_handle_vdev(struct rproc *rproc, void *ptr,
struct device *dev = &rproc->dev;
struct rproc_vdev *rvdev;
struct rproc_vdev_data rvdev_data;
+ struct platform_device *pdev;
/* make sure resource isn't truncated */
if (struct_size(rsc, vring, rsc->num_of_vrings) + rsc->config_len >
@@ -506,9 +507,13 @@ 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(rproc->dev.parent,
+ "failed to create rproc-virtio device\n");
+ return PTR_ERR(pdev);
+ }
return 0;
}
@@ -1248,7 +1253,7 @@ 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);
}
diff --git a/drivers/remoteproc/remoteproc_internal.h b/drivers/remoteproc/remoteproc_internal.h
index f82f9a5378ae..41176f4b35c9 100644
--- a/drivers/remoteproc/remoteproc_internal.h
+++ b/drivers/remoteproc/remoteproc_internal.h
@@ -45,10 +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);
-void rproc_rvdev_remove_device(struct rproc_vdev *rvdev);
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);
diff --git a/drivers/remoteproc/remoteproc_virtio.c b/drivers/remoteproc/remoteproc_virtio.c
index e2e796ab2fd8..3937c1e5eb19 100644
--- a/drivers/remoteproc/remoteproc_virtio.c
+++ b/drivers/remoteproc/remoteproc_virtio.c
@@ -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)
@@ -341,13 +346,10 @@ 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);
}
/**
@@ -363,7 +365,7 @@ 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;
@@ -433,18 +435,8 @@ 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) {
@@ -486,78 +478,57 @@ 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);
-
- 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*/
@@ -577,18 +548,30 @@ rproc_rvdev_add_device(struct rproc *rproc, struct rproc_vdev_data *rvdev_data)
rproc_add_subdev(rproc, &rvdev->subdev);
- return rvdev;
+ dev_dbg(dev, "virtio dev %d added\n", rvdev->index);
+
+ /*
+ * We're indirectly making a non-temporary copy of the rproc pointer
+ * here, because the platform devicer 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_rvdev_remove_device(struct rproc_vdev *rvdev)
+static int rproc_virtio_remove(struct platform_device *pdev)
{
+ struct rproc_vdev *rvdev = dev_get_drvdata(&pdev->dev);
struct rproc *rproc = rvdev->rproc;
struct rproc_vring *rvring;
int id;
@@ -600,12 +583,29 @@ void rproc_rvdev_remove_device(struct rproc_vdev *rvdev)
rproc_remove_subdev(rproc, &rvdev->subdev);
rproc_remove_rvdev(rvdev);
- device_unregister(&rvdev->dev);
-}
-void rproc_vdev_release(struct kref *ref)
-{
- struct rproc_vdev *rvdev = container_of(ref, struct rproc_vdev, refcount);
+ of_reserved_mem_device_release(&pdev->dev);
+
+ dev_dbg(&pdev->dev, "virtio dev %d removed\n", rvdev->index);
- rproc_rvdev_remove_device(rvdev);
+ /* The remote proc device can be removed */
+ 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);
diff --git a/include/linux/remoteproc.h b/include/linux/remoteproc.h
index 7c943f0a2fc4..64b9809d0ec1 100644
--- a/include/linux/remoteproc.h
+++ b/include/linux/remoteproc.h
@@ -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;
--
2.25.1
On Wed, Apr 06, 2022 at 11:54:46AM +0200, Arnaud Pouliquen wrote:
> 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/remove ops replace
> the rproc_rvdev_add_device/rproc_rvdev_remove_device functions.
> - 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 <[email protected]>
> ---
> Update vs previous revision:
> - Updated the compatible name to align with the "virtio, <transport>"
> name used for instance for "virtio,mmio"
> ---
> drivers/remoteproc/remoteproc_core.c | 13 +-
> drivers/remoteproc/remoteproc_internal.h | 3 -
> drivers/remoteproc/remoteproc_virtio.c | 146 +++++++++++------------
> include/linux/remoteproc.h | 6 +-
> 4 files changed, 84 insertions(+), 84 deletions(-)
>
> diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c
> index bd6d3f2decc6..c0c88ecaa66e 100644
> --- a/drivers/remoteproc/remoteproc_core.c
> +++ b/drivers/remoteproc/remoteproc_core.c
> @@ -478,6 +478,7 @@ static int rproc_handle_vdev(struct rproc *rproc, void *ptr,
> struct device *dev = &rproc->dev;
> struct rproc_vdev *rvdev;
> struct rproc_vdev_data rvdev_data;
> + struct platform_device *pdev;
>
> /* make sure resource isn't truncated */
> if (struct_size(rsc, vring, rsc->num_of_vrings) + rsc->config_len >
> @@ -506,9 +507,13 @@ 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(rproc->dev.parent,
dev_err(dev,
> + "failed to create rproc-virtio device\n");
> + return PTR_ERR(pdev);
> + }
>
> return 0;
> }
> @@ -1248,7 +1253,7 @@ 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);
> }
> diff --git a/drivers/remoteproc/remoteproc_internal.h b/drivers/remoteproc/remoteproc_internal.h
> index f82f9a5378ae..41176f4b35c9 100644
> --- a/drivers/remoteproc/remoteproc_internal.h
> +++ b/drivers/remoteproc/remoteproc_internal.h
> @@ -45,10 +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);
> -void rproc_rvdev_remove_device(struct rproc_vdev *rvdev);
> 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);
> diff --git a/drivers/remoteproc/remoteproc_virtio.c b/drivers/remoteproc/remoteproc_virtio.c
> index e2e796ab2fd8..3937c1e5eb19 100644
> --- a/drivers/remoteproc/remoteproc_virtio.c
> +++ b/drivers/remoteproc/remoteproc_virtio.c
> @@ -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)
> @@ -341,13 +346,10 @@ 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);
> }
>
> /**
> @@ -363,7 +365,7 @@ 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;
> @@ -433,18 +435,8 @@ 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) {
> @@ -486,78 +478,57 @@ 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);
> -
> - 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*/
> @@ -577,18 +548,30 @@ rproc_rvdev_add_device(struct rproc *rproc, struct rproc_vdev_data *rvdev_data)
>
> rproc_add_subdev(rproc, &rvdev->subdev);
>
> - return rvdev;
> + dev_dbg(dev, "virtio dev %d added\n", rvdev->index);
Please remove this along with the one in rproc_vdev_release().
> +
> + /*
> + * We're indirectly making a non-temporary copy of the rproc pointer
> + * here, because the platform devicer 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_rvdev_remove_device(struct rproc_vdev *rvdev)
> +static int rproc_virtio_remove(struct platform_device *pdev)
> {
> + struct rproc_vdev *rvdev = dev_get_drvdata(&pdev->dev);
> struct rproc *rproc = rvdev->rproc;
> struct rproc_vring *rvring;
> int id;
> @@ -600,12 +583,29 @@ void rproc_rvdev_remove_device(struct rproc_vdev *rvdev)
>
> rproc_remove_subdev(rproc, &rvdev->subdev);
> rproc_remove_rvdev(rvdev);
> - device_unregister(&rvdev->dev);
> -}
>
> -void rproc_vdev_release(struct kref *ref)
> -{
> - struct rproc_vdev *rvdev = container_of(ref, struct rproc_vdev, refcount);
> + of_reserved_mem_device_release(&pdev->dev);
> +
> + dev_dbg(&pdev->dev, "virtio dev %d removed\n", rvdev->index);
>
> - rproc_rvdev_remove_device(rvdev);
> + /* The remote proc device can be removed */
This comment doesn't make sense - the remoteproc device can't be removed here.
Please refactor.
Thanks,
Mathieu
> + 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);
> diff --git a/include/linux/remoteproc.h b/include/linux/remoteproc.h
> index 7c943f0a2fc4..64b9809d0ec1 100644
> --- a/include/linux/remoteproc.h
> +++ b/include/linux/remoteproc.h
> @@ -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;
> --
> 2.25.1
>