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Date: Tue, 5 Jul 2022 10:26:01 -0600
From: Mathieu Poirier <mathieu.poirier@...aro.org>
To: Arnaud Pouliquen <arnaud.pouliquen@...s.st.com>
Cc: Bjorn Andersson <bjorn.andersson@...aro.org>,
linux-remoteproc@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-stm32@...md-mailman.stormreply.com,
Rob Herring <robh@...nel.org>, Christoph Hellwig <hch@....de>,
Stefano Stabellini <stefanos@...inx.com>,
Bruce Ashfield <bruce.ashfield@...inx.com>
Subject: Re: [RFC PATCH v5 3/4] remoteproc: Move rproc_vdev management to
remoteproc_virtio.c
On Tue, Jul 05, 2022 at 10:07:22AM -0600, Mathieu Poirier wrote:
> On Wed, Apr 06, 2022 at 11:54:45AM +0200, Arnaud Pouliquen wrote:
> > Move functions related to the management of the rproc_vdev
> > structure in the remoteproc_virtio.c.
> > The aim is to decorrelate as possible the virtio management from
> > the core part.
> >
> > Due to the strong correlation between the vrings and the resource table
> > the rproc_alloc/parse/free_vring functions are kept in the remoteproc core.
> >
> > Signed-off-by: Arnaud Pouliquen <arnaud.pouliquen@...s.st.com>
> >
> > ---
> > Update vs previous revision:
> > - clean up bad rproc_free_vring call in rproc_vdev_release
>
> Stale comment. What has changed in this revision is that
> rproc_rvdev_remove_device() has been dropped.
Void the comments for this patch. I was looking at this earlier revision to
compare with the current v6. Please find my comments there.
>
> > ---
> > drivers/remoteproc/remoteproc_core.c | 162 +----------------------
> > drivers/remoteproc/remoteproc_internal.h | 11 +-
> > drivers/remoteproc/remoteproc_virtio.c | 159 +++++++++++++++++++++-
> > 3 files changed, 167 insertions(+), 165 deletions(-)
> >
> > diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c
> > index 081bea39daf4..bd6d3f2decc6 100644
> > --- a/drivers/remoteproc/remoteproc_core.c
> > +++ b/drivers/remoteproc/remoteproc_core.c
> > @@ -23,9 +23,7 @@
> > #include <linux/panic_notifier.h>
> > #include <linux/slab.h>
> > #include <linux/mutex.h>
> > -#include <linux/dma-map-ops.h>
> > #include <linux/dma-mapping.h>
> > -#include <linux/dma-direct.h> /* XXX: pokes into bus_dma_range */
> > #include <linux/firmware.h>
> > #include <linux/string.h>
> > #include <linux/debugfs.h>
> > @@ -383,7 +381,7 @@ int rproc_alloc_vring(struct rproc_vdev *rvdev, int i)
> > return 0;
> > }
> >
> > -static int
> > +int
> > rproc_parse_vring(struct rproc_vdev *rvdev, struct fw_rsc_vdev *rsc, int i)
> > {
> > struct rproc *rproc = rvdev->rproc;
> > @@ -434,164 +432,17 @@ void rproc_free_vring(struct rproc_vring *rvring)
> > }
> > }
> >
> > -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 copy_dma_range_map(struct device *to, struct device *from)
> > -{
> > - const struct bus_dma_region *map = from->dma_range_map, *new_map, *r;
> > - int num_ranges = 0;
> > -
> > - if (!map)
> > - return 0;
> > -
> > - for (r = map; r->size; r++)
> > - num_ranges++;
> > -
> > - new_map = kmemdup(map, array_size(num_ranges + 1, sizeof(*map)),
> > - GFP_KERNEL);
> > - if (!new_map)
> > - return -ENOMEM;
> > - to->dma_range_map = new_map;
> > - return 0;
> > -}
> > -
> > -static void rproc_add_rvdev(struct rproc *rproc, struct rproc_vdev *rvdev)
> > +void rproc_add_rvdev(struct rproc *rproc, struct rproc_vdev *rvdev)
> > {
> > if (rvdev && rproc)
> > list_add_tail(&rvdev->node, &rproc->rvdevs);
> > }
> >
> > -static void rproc_remove_rvdev(struct rproc_vdev *rvdev)
> > +void rproc_remove_rvdev(struct rproc_vdev *rvdev)
> > {
> > if (rvdev)
> > list_del(&rvdev->node);
> > }
> > -
> > -static struct rproc_vdev *
> > -rproc_rvdev_add_device(struct rproc *rproc, struct rproc_vdev_data *rvdev_data)
> > -{
> > - struct rproc_vdev *rvdev;
> > - struct fw_rsc_vdev *rsc = rvdev_data->rsc;
> > - char name[16];
> > - int i, ret;
> > -
> > - rvdev = kzalloc(sizeof(*rvdev), GFP_KERNEL);
> > - if (!rvdev)
> > - return ERR_PTR(-ENOMEM);
> > -
> > - kref_init(&rvdev->refcount);
> > -
> > - 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);
> > - 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));
> > - }
> > -
> > - /* parse the vrings */
> > - for (i = 0; i < rsc->num_of_vrings; i++) {
> > - ret = rproc_parse_vring(rvdev, rsc, i);
> > - if (ret)
> > - goto free_rvdev;
> > - }
> > -
> > - /* remember the resource offset*/
> > - rvdev->rsc_offset = rvdev_data->rsc_offset;
> > -
> > - /* allocate the vring resources */
> > - for (i = 0; i < rsc->num_of_vrings; i++) {
> > - ret = rproc_alloc_vring(rvdev, i);
> > - if (ret)
> > - goto unwind_vring_allocations;
> > - }
> > -
> > - rproc_add_rvdev(rproc, rvdev);
> > -
> > - rvdev->subdev.start = rproc_vdev_do_start;
> > - rvdev->subdev.stop = rproc_vdev_do_stop;
> > -
> > - rproc_add_subdev(rproc, &rvdev->subdev);
> > -
> > - return rvdev;
> > -
> > -unwind_vring_allocations:
> > - for (i--; i >= 0; i--)
> > - rproc_free_vring(&rvdev->vring[i]);
> > -free_rvdev:
> > - device_unregister(&rvdev->dev);
> > - return ERR_PTR(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);
> > - rproc_remove_rvdev(rvdev);
> > - device_unregister(&rvdev->dev);
> > -}
> > -
> > /**
> > * rproc_handle_vdev() - handle a vdev fw resource
> > * @rproc: the remote processor
> > @@ -662,13 +513,6 @@ static int rproc_handle_vdev(struct rproc *rproc, void *ptr,
> > return 0;
> > }
> >
> > -void rproc_vdev_release(struct kref *ref)
> > -{
> > - struct rproc_vdev *rvdev = container_of(ref, struct rproc_vdev, refcount);
> > -
> > - rproc_rvdev_remove_device(rvdev);
> > -}
> > -
> > /**
> > * rproc_handle_trace() - handle a shared trace buffer resource
> > * @rproc: the remote processor
> > diff --git a/drivers/remoteproc/remoteproc_internal.h b/drivers/remoteproc/remoteproc_internal.h
> > index 99f2ff88079f..f82f9a5378ae 100644
> > --- a/drivers/remoteproc/remoteproc_internal.h
> > +++ b/drivers/remoteproc/remoteproc_internal.h
> > @@ -41,14 +41,14 @@ struct rproc_vdev_data {
> >
> > /* from remoteproc_core.c */
> > void rproc_release(struct kref *kref);
> > -irqreturn_t rproc_vq_interrupt(struct rproc *rproc, int vq_id);
> > -void rproc_vdev_release(struct kref *ref);
> > int rproc_of_parse_firmware(struct device *dev, int index,
> > const char **fw_name);
> >
> > /* 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);
> > +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);
>
> Stale
>
> > +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);
> > @@ -98,6 +98,7 @@ static inline void rproc_char_device_remove(struct rproc *rproc)
> >
> > void rproc_free_vring(struct rproc_vring *rvring);
> > int rproc_alloc_vring(struct rproc_vdev *rvdev, int i);
> > +int rproc_parse_vring(struct rproc_vdev *rvdev, struct fw_rsc_vdev *rsc, int i);
> >
> > phys_addr_t rproc_va_to_pa(void *cpu_addr);
> > int rproc_trigger_recovery(struct rproc *rproc);
> > @@ -110,6 +111,8 @@ struct resource_table *rproc_elf_find_loaded_rsc_table(struct rproc *rproc,
> > const struct firmware *fw);
> > struct rproc_mem_entry *
> > rproc_find_carveout_by_name(struct rproc *rproc, const char *name, ...);
> > +void rproc_add_rvdev(struct rproc *rproc, struct rproc_vdev *rvdev);
> > +void rproc_remove_rvdev(struct rproc_vdev *rvdev);
> >
> > static inline int rproc_prepare_device(struct rproc *rproc)
> > {
> > diff --git a/drivers/remoteproc/remoteproc_virtio.c b/drivers/remoteproc/remoteproc_virtio.c
> > index 70ab496d0431..e2e796ab2fd8 100644
> > --- a/drivers/remoteproc/remoteproc_virtio.c
> > +++ b/drivers/remoteproc/remoteproc_virtio.c
> > @@ -9,7 +9,9 @@
> > * Brian Swetland <swetland@...gle.com>
> > */
> >
> > +#include <linux/dma-direct.h>
> > #include <linux/dma-map-ops.h>
> > +#include <linux/dma-mapping.h>
> > #include <linux/export.h>
> > #include <linux/of_reserved_mem.h>
> > #include <linux/remoteproc.h>
> > @@ -23,6 +25,25 @@
> >
> > #include "remoteproc_internal.h"
> >
> > +static int copy_dma_range_map(struct device *to, struct device *from)
> > +{
> > + const struct bus_dma_region *map = from->dma_range_map, *new_map, *r;
> > + int num_ranges = 0;
> > +
> > + if (!map)
> > + return 0;
> > +
> > + for (r = map; r->size; r++)
> > + num_ranges++;
> > +
> > + new_map = kmemdup(map, array_size(num_ranges + 1, sizeof(*map)),
> > + GFP_KERNEL);
> > + if (!new_map)
> > + return -ENOMEM;
> > + to->dma_range_map = new_map;
> > + return 0;
> > +}
> > +
> > static struct rproc_vdev *vdev_to_rvdev(struct virtio_device *vdev)
> > {
> > return container_of(vdev->dev.parent, struct rproc_vdev, dev);
> > @@ -339,7 +360,7 @@ static void rproc_virtio_dev_release(struct device *dev)
> > *
> > * Return: 0 on success or an appropriate error value otherwise
> > */
> > -int rproc_add_virtio_dev(struct rproc_vdev *rvdev, int id)
> > +static int rproc_add_virtio_dev(struct rproc_vdev *rvdev, int id)
> > {
> > struct rproc *rproc = rvdev->rproc;
> > struct device *dev = &rvdev->dev;
> > @@ -447,10 +468,144 @@ int rproc_add_virtio_dev(struct rproc_vdev *rvdev, int id)
> > *
> > * Return: 0
> > */
> > -int rproc_remove_virtio_dev(struct device *dev, void *data)
> > +static int rproc_remove_virtio_dev(struct device *dev, void *data)
> > {
> > struct virtio_device *vdev = dev_to_virtio(dev);
> >
> > unregister_virtio_device(vdev);
> > return 0;
> > }
> > +
> > +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);
> > +}
> > +
> > +struct rproc_vdev *
> > +rproc_rvdev_add_device(struct rproc *rproc, struct rproc_vdev_data *rvdev_data)
> > +{
> > + struct rproc_vdev *rvdev;
> > + struct fw_rsc_vdev *rsc = rvdev_data->rsc;
> > + char name[16];
> > + int i, ret;
> > +
> > + rvdev = kzalloc(sizeof(*rvdev), GFP_KERNEL);
> > + if (!rvdev)
> > + return ERR_PTR(-ENOMEM);
> > +
> > + kref_init(&rvdev->refcount);
> > +
> > + 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);
> > + 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));
> > + }
> > +
> > + /* parse the vrings */
> > + for (i = 0; i < rsc->num_of_vrings; i++) {
> > + ret = rproc_parse_vring(rvdev, rsc, i);
> > + if (ret)
> > + goto free_rvdev;
> > + }
> > +
> > + /* remember the resource offset*/
> > + rvdev->rsc_offset = rvdev_data->rsc_offset;
> > +
> > + /* allocate the vring resources */
> > + for (i = 0; i < rsc->num_of_vrings; i++) {
> > + ret = rproc_alloc_vring(rvdev, i);
> > + if (ret)
> > + goto unwind_vring_allocations;
> > + }
> > +
> > + rproc_add_rvdev(rproc, rvdev);
> > +
> > + rvdev->subdev.start = rproc_vdev_do_start;
> > + rvdev->subdev.stop = rproc_vdev_do_stop;
> > +
> > + rproc_add_subdev(rproc, &rvdev->subdev);
> > +
> > + return rvdev;
> > +
> > +unwind_vring_allocations:
> > + for (i--; i >= 0; i--)
> > + rproc_free_vring(&rvdev->vring[i]);
> > +free_rvdev:
> > + device_unregister(&rvdev->dev);
> > + return ERR_PTR(ret);
> > +}
> > +
> > +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);
> > + 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);
> > +
> > + rproc_rvdev_remove_device(rvdev);
> > +}
> > --
> > 2.25.1
> >
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