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remoteproc: Introduce subdevices 

A subdevice is an abstract entity that can be used to tie actions to the
booting and shutting down of a remote processor. The subdevice object is
expected to be embedded in concrete implementations, allowing for a
variety of use cases to be implemented.

Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
This commit is contained in:
Bjorn Andersson 2016-10-19 19:40:02 -07:00
parent 1d701d3dd8
commit 7bdc9650f0
2 changed files with 94 additions and 0 deletions
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72
drivers/remoteproc/remoteproc_core.c
View File

@ -736,6 +736,34 @@ static int rproc_handle_resources(struct rproc *rproc, int len,
return ret;
}
static int rproc_probe_subdevices(struct rproc *rproc)
{
struct rproc_subdev *subdev;
int ret;
list_for_each_entry(subdev, &rproc->subdevs, node) {
ret = subdev->probe(subdev);
if (ret)
goto unroll_registration;
}
return 0;
unroll_registration:
list_for_each_entry_continue_reverse(subdev, &rproc->subdevs, node)
subdev->remove(subdev);
return ret;
}
static void rproc_remove_subdevices(struct rproc *rproc)
{
struct rproc_subdev *subdev;
list_for_each_entry(subdev, &rproc->subdevs, node)
subdev->remove(subdev);
}
/**
* rproc_resource_cleanup() - clean up and free all acquired resources
* @rproc: rproc handle
@ -878,12 +906,22 @@ static int rproc_fw_boot(struct rproc *rproc, const struct firmware *fw)
goto clean_up_resources;
}
/* probe any subdevices for the remote processor */
ret = rproc_probe_subdevices(rproc);
if (ret) {
dev_err(dev, "failed to probe subdevices for %s: %d\n",
rproc->name, ret);
goto stop_rproc;
}
rproc->state = RPROC_RUNNING;
dev_info(dev, "remote processor %s is now up\n", rproc->name);
return 0;
stop_rproc:
rproc->ops->stop(rproc);
clean_up_resources:
rproc_resource_cleanup(rproc);
clean_up:
@ -1121,6 +1159,9 @@ void rproc_shutdown(struct rproc *rproc)
if (!atomic_dec_and_test(&rproc->power))
goto out;
/* remove any subdevices for the remote processor */
rproc_remove_subdevices(rproc);
/* power off the remote processor */
ret = rproc->ops->stop(rproc);
if (ret) {
@ -1372,6 +1413,7 @@ struct rproc *rproc_alloc(struct device *dev, const char *name,
INIT_LIST_HEAD(&rproc->mappings);
INIT_LIST_HEAD(&rproc->traces);
INIT_LIST_HEAD(&rproc->rvdevs);
INIT_LIST_HEAD(&rproc->subdevs);
INIT_WORK(&rproc->crash_handler, rproc_crash_handler_work);
init_completion(&rproc->crash_comp);
@ -1458,6 +1500,36 @@ int rproc_del(struct rproc *rproc)
}
EXPORT_SYMBOL(rproc_del);
/**
* rproc_add_subdev() - add a subdevice to a remoteproc
* @rproc: rproc handle to add the subdevice to
* @subdev: subdev handle to register
* @probe: function to call when the rproc boots
* @remove: function to call when the rproc shuts down
*/
void rproc_add_subdev(struct rproc *rproc,
struct rproc_subdev *subdev,
int (*probe)(struct rproc_subdev *subdev),
void (*remove)(struct rproc_subdev *subdev))
{
subdev->probe = probe;
subdev->remove = remove;
list_add_tail(&subdev->node, &rproc->subdevs);
}
EXPORT_SYMBOL(rproc_add_subdev);
/**
* rproc_remove_subdev() - remove a subdevice from a remoteproc
* @rproc: rproc handle to remove the subdevice from
* @subdev: subdev handle, previously registered with rproc_add_subdev()
*/
void rproc_remove_subdev(struct rproc *rproc, struct rproc_subdev *subdev)
{
list_del(&subdev->node);
}
EXPORT_SYMBOL(rproc_remove_subdev);
/**
* rproc_report_crash() - rproc crash reporter function
* @rproc: remote processor

22
include/linux/remoteproc.h
View File

@ -400,6 +400,7 @@ enum rproc_crash_type {
* @firmware_loading_complete: marks e/o asynchronous firmware loading
* @bootaddr: address of first instruction to boot rproc with (optional)
* @rvdevs: list of remote virtio devices
* @subdevs: list of subdevices, to following the running state
* @notifyids: idr for dynamically assigning rproc-wide unique notify ids
* @index: index of this rproc device
* @crash_handler: workqueue for handling a crash
@ -431,6 +432,7 @@ struct rproc {
struct completion firmware_loading_complete;
u32 bootaddr;
struct list_head rvdevs;
struct list_head subdevs;
struct idr notifyids;
int index;
struct work_struct crash_handler;
@ -444,6 +446,19 @@ struct rproc {
bool auto_boot;
};
/**
* struct rproc_subdev - subdevice tied to a remoteproc
* @node: list node related to the rproc subdevs list
* @probe: probe function, called as the rproc is started
* @remove: remove function, called as the rproc is stopped
*/
struct rproc_subdev {
struct list_head node;
int (*probe)(struct rproc_subdev *subdev);
void (*remove)(struct rproc_subdev *subdev);
};
/* we currently support only two vrings per rvdev */
#define RVDEV_NUM_VRINGS 2
@ -511,4 +526,11 @@ static inline struct rproc *vdev_to_rproc(struct virtio_device *vdev)
return rvdev->rproc;
}
void rproc_add_subdev(struct rproc *rproc,
struct rproc_subdev *subdev,
int (*probe)(struct rproc_subdev *subdev),
void (*remove)(struct rproc_subdev *subdev));
void rproc_remove_subdev(struct rproc *rproc, struct rproc_subdev *subdev);
#endif /* REMOTEPROC_H */