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Date: Wed, 22 Apr 2020 11:26:08 -0600
From: Mathieu Poirier <mathieu.poirier@...aro.org>
To: Arnaud Pouliquen <arnaud.pouliquen@...com>
Cc: Bjorn Andersson <bjorn.andersson@...aro.org>,
Ohad Ben-Cohen <ohad@...ery.com>,
linux-remoteproc@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-stm32@...md-mailman.stormreply.com
Subject: Re: [RFC 03/18] remoteproc: Move rvdev management in rproc_virtio
On Thu, Apr 16, 2020 at 06:13:16PM +0200, Arnaud Pouliquen wrote:
> Migrate the management of the rvdev device and subdev from core
> to virtio, to prepare the rpmsg virtio platform device creation.
>
> Signed-off-by: Arnaud Pouliquen <arnaud.pouliquen@...com>
> ---
> drivers/remoteproc/remoteproc_core.c | 118 +-------------------
> drivers/remoteproc/remoteproc_internal.h | 5 +-
> drivers/remoteproc/remoteproc_virtio.c | 136 +++++++++++++++++++++--
> 3 files changed, 131 insertions(+), 128 deletions(-)
>
> diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c
> index 5c90d569c0f7..4fcd685cbfd8 100644
> --- a/drivers/remoteproc/remoteproc_core.c
> +++ b/drivers/remoteproc/remoteproc_core.c
> @@ -371,8 +371,7 @@ int rproc_alloc_vring(struct rproc_vdev *rvdev, int i)
> return 0;
> }
>
> -static int
> -rproc_parse_vring(struct rproc_vdev *rvdev, struct fw_rsc_vdev *rsc, int i)
> +int rproc_parse_vring(struct rproc_vdev *rvdev, struct fw_rsc_vdev *rsc, int i)
> {
> struct rproc *rproc = rvdev->rproc;
> struct device *dev = &rproc->dev;
> @@ -410,117 +409,6 @@ void rproc_free_vring(struct rproc_vring *rvring)
> rsc->vring[idx].notifyid = -1;
> }
>
> -static int rproc_vdev_do_start(struct rproc_subdev *subdev)
> -{
> - struct rproc_vdev *rvdev = container_of(subdev, struct rproc_vdev, subdev);
> -
> - return rproc_add_virtio_dev(rvdev, rvdev->id);
> -}
> -
> -static void rproc_vdev_do_stop(struct rproc_subdev *subdev, bool crashed)
> -{
> - struct rproc_vdev *rvdev = container_of(subdev, struct rproc_vdev, subdev);
> - int ret;
> -
> - ret = device_for_each_child(&rvdev->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);
> -}
> -
> -static int rproc_rvdev_add_device(struct rproc_vdev *rvdev)
> -{
> - struct rproc *rproc = rvdev->rproc;
> - struct fw_rsc_vdev *rsc = rvdev->rsc;
> - char name[16];
> - int ret, i;
> -
> - /* Initialise vdev subdevice */
> - snprintf(name, sizeof(name), "vdev%dbuffer", rvdev->index);
> - rvdev->dev.parent = &rproc->dev;
> - rvdev->dev.dma_pfn_offset = rproc->dev.parent->dma_pfn_offset;
> - 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));
> -
> - 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... %x\n",
> - dma_get_mask(rproc->dev.parent), ret);
> - }
> -
> - /* parse the vrings */
> - for (i = 0; i < rsc->num_of_vrings; i++) {
> - ret = rproc_parse_vring(rvdev, rsc, i);
> - if (ret)
> - goto free_rvdev;
> - }
> -
> - /* allocate the vring resources */
> - for (i = 0; i < rsc->num_of_vrings; i++) {
> - ret = rproc_alloc_vring(rvdev, i);
> - if (ret)
> - goto free_vg;
> - }
> -
> - rvdev->subdev.start = rproc_vdev_do_start;
> - rvdev->subdev.stop = rproc_vdev_do_stop;
> -
> - rproc_add_subdev(rproc, &rvdev->subdev);
> -
> - return 0;
> -
> -free_vg:
> - for (i--; i >= 0; i--) {
> - struct rproc_vring *rvring = &rvdev->vring[i];
> -
> - rproc_free_vring(rvring);
> - }
> -
> -free_rvdev:
> - device_unregister(&rvdev->dev);
> -
> - return ret;
> -}
> -
> -static void rproc_rvdev_remove_device(struct rproc_vdev *rvdev)
> -{
> - struct rproc *rproc = rvdev->rproc;
> - struct rproc_vring *rvring;
> - int id;
> -
> - for (id = 0; id < ARRAY_SIZE(rvdev->vring); id++) {
> - rvring = &rvdev->vring[id];
> - rproc_free_vring(rvring);
> - }
> -
> - rproc_remove_subdev(rproc, &rvdev->subdev);
> - device_unregister(&rvdev->dev);
> -}
> -
> /**
> * rproc_handle_vdev() - handle a vdev fw resource
> * @rproc: the remote processor
> @@ -590,14 +478,14 @@ static int rproc_handle_vdev(struct rproc *rproc, struct fw_rsc_vdev *rsc,
>
> list_add_tail(&rvdev->node, &rproc->rvdevs);
>
> - return rproc_rvdev_add_device(rvdev);
> + return rproc_virtio_device_add(rvdev);
> }
>
> void rproc_vdev_release(struct kref *ref)
> {
> struct rproc_vdev *rvdev = container_of(ref, struct rproc_vdev, refcount);
>
> - rproc_rvdev_remove_device(rvdev);
> + rproc_virtio_device_remove(rvdev);
> list_del(&rvdev->node);
> }
>
> diff --git a/drivers/remoteproc/remoteproc_internal.h b/drivers/remoteproc/remoteproc_internal.h
> index 493ef9262411..fad95f1a50c1 100644
> --- a/drivers/remoteproc/remoteproc_internal.h
> +++ b/drivers/remoteproc/remoteproc_internal.h
> @@ -30,8 +30,8 @@ irqreturn_t rproc_vq_interrupt(struct rproc *rproc, int vq_id);
> void rproc_vdev_release(struct kref *ref);
>
> /* from remoteproc_virtio.c */
> -int rproc_add_virtio_dev(struct rproc_vdev *rvdev, int id);
> -int rproc_remove_virtio_dev(struct device *dev, void *data);
> +int rproc_virtio_device_add(struct rproc_vdev *rvdev);
> +void rproc_virtio_device_remove(struct rproc_vdev *rvdev);
>
> /* from remoteproc_debugfs.c */
> void rproc_remove_trace_file(struct dentry *tfile);
> @@ -47,6 +47,7 @@ extern struct class rproc_class;
> int rproc_init_sysfs(void);
> void rproc_exit_sysfs(void);
>
> +int rproc_parse_vring(struct rproc_vdev *rvdev, struct fw_rsc_vdev *rsc, int i);
> void rproc_free_vring(struct rproc_vring *rvring);
> int rproc_alloc_vring(struct rproc_vdev *rvdev, int i);
>
> diff --git a/drivers/remoteproc/remoteproc_virtio.c b/drivers/remoteproc/remoteproc_virtio.c
> index 8c07cb2ca8ba..0f7efac7d4f3 100644
> --- a/drivers/remoteproc/remoteproc_virtio.c
> +++ b/drivers/remoteproc/remoteproc_virtio.c
> @@ -296,6 +296,20 @@ static const struct virtio_config_ops rproc_virtio_config_ops = {
> .set = rproc_virtio_set,
> };
>
> +/**
> + * rproc_rvdev_release() - release the existence of a rvdev
> + *
> + * @dev: the subdevice's dev
> + */
> +static void rproc_virtio_rvdev_release(struct device *dev)
> +{
> + struct rproc_vdev *rvdev = container_of(dev, struct rproc_vdev, dev);
> +
> + of_reserved_mem_device_release(dev);
> +
> + kfree(rvdev);
> +}
> +
> /*
> * This function is called whenever vdev is released, and is responsible
> * to decrement the remote processor's refcount which was taken when vdev was
> @@ -318,16 +332,18 @@ static void rproc_virtio_dev_release(struct device *dev)
> }
>
> /**
> - * rproc_add_virtio_dev() - register an rproc-induced virtio device
> - * @rvdev: the remote vdev
> + * rproc_vdev_start() - register an rproc-induced virtio device
> + * @subdev: the rproc virtio subdevice
> *
> * This function registers a virtio device. This vdev's partent is
> * the rproc device.
> *
> * Returns 0 on success or an appropriate error value otherwise.
> */
> -int rproc_add_virtio_dev(struct rproc_vdev *rvdev, int id)
> +static int rproc_vitio_start(struct rproc_subdev *subdev)
> {
> + struct rproc_vdev *rvdev = container_of(subdev, struct rproc_vdev,
> + subdev);
> struct rproc *rproc = rvdev->rproc;
> struct device *dev = &rvdev->dev;
> struct virtio_device *vdev;
> @@ -376,7 +392,7 @@ int rproc_add_virtio_dev(struct rproc_vdev *rvdev, int id)
> ret = -ENOMEM;
> goto out;
> }
> - vdev->id.device = id,
> + vdev->id.device = rvdev->id,
> vdev->config = &rproc_virtio_config_ops,
> vdev->dev.parent = dev;
> vdev->dev.release = rproc_virtio_dev_release;
> @@ -401,23 +417,121 @@ int rproc_add_virtio_dev(struct rproc_vdev *rvdev, int id)
> goto out;
> }
>
> - dev_info(dev, "registered %s (type %d)\n", dev_name(&vdev->dev), id);
> + dev_info(dev, "registered %s (type %d)\n", dev_name(&vdev->dev),
> + rvdev->id);
>
> out:
> return ret;
> }
>
> +static int rproc_remove_virtio_dev(struct device *dev, void *data)
> +{
> + struct virtio_device *vdev = dev_to_virtio(dev);
> + struct rproc_vdev *rvdev = vdev_to_rvdev(vdev);
> + struct rproc_vring *rvring;
> + int id;
> +
> + unregister_virtio_device(vdev);
> +
> + for (id = 0; id < ARRAY_SIZE(rvdev->vring); id++) {
> + rvring = &rvdev->vring[id];
> + rproc_free_vring(rvring);
> + }
> +
> + return 0;
> +}
> /**
> * rproc_remove_virtio_dev() - remove an rproc-induced virtio device
> - * @dev: the virtio device
> - * @data: must be null
> + * @subdev: the rproc virtio subdevice
> + * @crashed: indicate if the stop is the result of a crash
> *
> - * This function unregisters an existing virtio device.
> + * This function unregisters existing virtio devices.
> */
> -int rproc_remove_virtio_dev(struct device *dev, void *data)
> +static void rproc_vitio_stop(struct rproc_subdev *subdev, bool crashed)
> {
> - struct virtio_device *vdev = dev_to_virtio(dev);
> + struct rproc_vdev *rvdev = container_of(subdev, struct rproc_vdev,
> + subdev);
> + int ret;
> +
> + ret = device_for_each_child(&rvdev->dev, NULL, rproc_remove_virtio_dev);
> + if (ret)
> + dev_warn(&rvdev->dev, "can't remove vdev child device: %d\n",
> + ret);
> +}
> +
> +static const struct rproc_subdev rproc_virtio_subdev = {
> + .start = rproc_vitio_start,
> + .stop = rproc_vitio_stop
> +};
> +
> +int rproc_virtio_device_add(struct rproc_vdev *rvdev)
> +{
> + struct rproc *rproc = rvdev->rproc;
> + struct fw_rsc_vdev *rsc = rvdev->rsc;
> + char name[16];
> + int ret, i;
> +
> + /* Initialise vdev subdevice */
> + snprintf(name, sizeof(name), "vdev%dbuffer", rvdev->index);
> + rvdev->dev.parent = &rproc->dev;
> + rvdev->dev.dma_pfn_offset = rproc->dev.parent->dma_pfn_offset;
> + rvdev->dev.release = rproc_virtio_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));
> +
> + 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... %x\n",
> + dma_get_mask(rproc->dev.parent), ret);
> + }
> +
> + /* parse the vrings */
> + for (i = 0; i < rsc->num_of_vrings; i++) {
> + ret = rproc_parse_vring(rvdev, rsc, i);
> + if (ret)
> + goto free_rvdev;
> + }
> +
> + /* allocate the vring resources */
> + for (i = 0; i < rsc->num_of_vrings; i++) {
> + ret = rproc_alloc_vring(rvdev, i);
> + if (ret)
> + goto free_vg;
> + }
> +
> + rvdev->subdev = rproc_virtio_subdev;
> +
> + rproc_add_subdev(rproc, &rvdev->subdev);
>
> - unregister_virtio_device(vdev);
> return 0;
> +
> +free_vg:
> + for (i--; i >= 0; i--) {
> + struct rproc_vring *rvring = &rvdev->vring[i];
> +
> + rproc_free_vring(rvring);
> + }
> +
> +free_rvdev:
> + device_unregister(&rvdev->dev);
> +
> + return ret;
> +}
> +
> +void rproc_virtio_device_remove(struct rproc_vdev *rvdev)
> +{
> + struct rproc *rproc = rvdev->rproc;
> +
> + rproc_remove_subdev(rproc, &rvdev->subdev);
> + device_unregister(&rvdev->dev);
This used to be rproc_rvdev_remove_device(), and now it is
rproc_virtio_device_remove()... I would have expected
rproc_virtio_remove_device() to be consistent. At the very least, it will sure
make it easier for me to connect the dots.
Not only did the name flipped but freeing the vrings has been moved to
rproc_remove_virtio_dev() without explanation.
> }
> --
> 2.17.1
>
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