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remoteproc: remove the single rpmsg vdev limitation

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Now that the resource table supports publishing a virtio device
in a single resource entry, firmware images can start supporting
more than a single vdev.

This patch removes the single vdev limitation of the remoteproc
framework so multi-vdev firmwares can be leveraged: VDEV resource
entries are parsed when the rproc is registered, and as a result
their vrings are set up and the virtio devices are registered
(and they go away when the rproc goes away).

Moreover, we no longer only support VIRTIO_ID_RPMSG vdevs; any
virtio device type goes now. As a result, there's no more any
rpmsg-specific APIs or code in remoteproc: it all becomes generic
virtio handling.

Signed-off-by: Ohad Ben-Cohen <ohad@wizery.com>
Cc: Brian Swetland <swetland@google.com>
Cc: Iliyan Malchev <malchev@google.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Grant Likely <grant.likely@secretlab.ca>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Mark Grosen <mgrosen@ti.com>
Cc: John Williams <john.williams@petalogix.com>
Cc: Michal Simek <monstr@monstr.eu>
Cc: Loic PALLARDY <loic.pallardy@stericsson.com>
Cc: Ludovic BARRE <ludovic.barre@stericsson.com>
Cc: Omar Ramirez Luna <omar.luna@linaro.org>
Cc: Guzman Lugo Fernando <fernando.lugo@ti.com>
Cc: Anna Suman <s-anna@ti.com>
Cc: Clark Rob <rob@ti.com>
Cc: Stephen Boyd <sboyd@codeaurora.org>
Cc: Saravana Kannan <skannan@codeaurora.org>
Cc: David Brown <davidb@codeaurora.org>
Cc: Kieran Bingham <kieranbingham@gmail.com>
Cc: Tony Lindgren <tony@atomide.com>
This commit is contained in:
Ohad Ben-Cohen 2012-02-13 22:30:39 +01:00
parent 41a6ee09ee
commit 7a18694162
5 changed files with 262 additions and 230 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

9
Documentation/remoteproc.txt
View file

@ -20,6 +20,11 @@ platform-specific remoteproc drivers only need to provide a few low-level
handlers, and then all rpmsg drivers will then just work
(for more information about the virtio-based rpmsg bus and its drivers,
please read Documentation/rpmsg.txt).
Registration of other types of virtio devices is now also possible. Firmwares
just need to publish what kind of virtio devices do they support, and then
remoteproc will add those devices. This makes it possible to reuse the
existing virtio drivers with remote processor backends at a minimal development
cost.
2. User API
@ -136,8 +141,6 @@ int dummy_rproc_example(struct rproc *my_rproc)
If found, those virtio devices will be created and added, so as a result
of registering this remote processor, additional virtio drivers might get
probed.
Currently, though, we only support a single RPMSG virtio vdev per remote
processor.
int rproc_unregister(struct rproc *rproc)
- Unregister a remote processor, and decrement its refcount.
@ -174,7 +177,7 @@ struct rproc_ops {
};
Every remoteproc implementation should at least provide the ->start and ->stop
handlers. If rpmsg functionality is also desired, then the ->kick handler
handlers. If rpmsg/virtio functionality is also desired, then the ->kick handler
should be provided as well.
The ->start() handler takes an rproc handle and should then power on the

296
drivers/remoteproc/remoteproc_core.c
View file

@ -52,8 +52,8 @@ static void klist_rproc_put(struct klist_node *n);
* We need this in order to support name-based lookups (needed by the
* rproc_get_by_name()).
*
* That said, we don't use rproc_get_by_name() anymore within the rpmsg
* framework. The use cases that do require its existence should be
* That said, we don't use rproc_get_by_name() at this point.
* The use cases that do require its existence should be
* scrutinized, and hopefully migrated to rproc_boot() using device-based
* binding.
*
@ -279,80 +279,112 @@ rproc_load_segments(struct rproc *rproc, const u8 *elf_data, size_t len)
return ret;
}
/**
* rproc_handle_early_vdev() - early handle a virtio header resource
* @rproc: the remote processor
* @rsc: the resource descriptor
* @avail: size of available data (for sanity checking the image)
*
* The existence of this virtio hdr resource entry means that the firmware
* of this @rproc supports this virtio device.
*
* Currently we support only a single virtio device of type VIRTIO_ID_RPMSG,
* but the plan is to remove this limitation and support any number
* of virtio devices (and of any type). We'll also add support for dynamically
* adding (and removing) virtio devices over the rpmsg bus, but simple
* firmwares that doesn't want to get involved with rpmsg will be able
* to simply use the resource table for this.
*
* Returns 0 on success, or an appropriate error code otherwise
*/
static int rproc_handle_early_vdev(struct rproc *rproc, struct fw_rsc_vdev *rsc,
int avail)
static int
__rproc_handle_vring(struct rproc_vdev *rvdev, struct fw_rsc_vdev *rsc, int i)
{
struct rproc_vdev *rvdev;
struct rproc *rproc = rvdev->rproc;
struct device *dev = rproc->dev;
struct fw_rsc_vdev_vring *vring = &rsc->vring[i];
dma_addr_t dma;
void *va;
int ret, size, notifyid;
/* make sure resource isn't truncated */
if (sizeof(*rsc) > avail) {
dev_err(rproc->dev, "vdev rsc is truncated\n");
dev_dbg(dev, "vdev rsc: vring%d: da %x, qsz %d, align %d\n",
i, vring->da, vring->num, vring->align);
/* make sure reserved bytes are zeroes */
if (vring->reserved) {
dev_err(dev, "vring rsc has non zero reserved bytes\n");
return -EINVAL;
}
/* we only support VIRTIO_ID_RPMSG devices for now */
if (rsc->id != VIRTIO_ID_RPMSG) {
dev_warn(rproc->dev, "unsupported vdev: %d\n", rsc->id);
/* the firmware must provide the expected queue size */
if (!vring->num) {
dev_err(dev, "invalid qsz (%d)\n", vring->num);
return -EINVAL;
}
/* we only support a single vdev per rproc for now */
if (rproc->rvdev) {
dev_warn(rproc->dev, "redundant vdev entry\n");
return -EINVAL;
}
/* actual size of vring (in bytes) */
size = PAGE_ALIGN(vring_size(vring->num, AMP_VRING_ALIGN));
rvdev = kzalloc(sizeof(struct rproc_vdev), GFP_KERNEL);
if (!rvdev)
if (!idr_pre_get(&rproc->notifyids, GFP_KERNEL)) {
dev_err(dev, "idr_pre_get failed\n");
return -ENOMEM;
}
/* remember the device features */
rvdev->dfeatures = rsc->dfeatures;
/*
* Allocate non-cacheable memory for the vring. In the future
* this call will also configure the IOMMU for us
*/
va = dma_alloc_coherent(dev, size, &dma, GFP_KERNEL);
if (!va) {
dev_err(dev, "dma_alloc_coherent failed\n");
return -EINVAL;
}
rproc->rvdev = rvdev;
rvdev->rproc = rproc;
/* assign an rproc-wide unique index for this vring */
/* TODO: assign a notifyid for rvdev updates as well */
ret = idr_get_new(&rproc->notifyids, &rvdev->vring[i], &notifyid);
if (ret) {
dev_err(dev, "idr_get_new failed: %d\n", ret);
dma_free_coherent(dev, size, va, dma);
return ret;
}
/* let the rproc know the da and notifyid of this vring */
/* TODO: expose this to remote processor */
vring->da = dma;
vring->notifyid = notifyid;
dev_dbg(dev, "vring%d: va %p dma %x size %x idr %d\n", i, va,
dma, size, notifyid);
rvdev->vring[i].len = vring->num;
rvdev->vring[i].va = va;
rvdev->vring[i].dma = dma;
rvdev->vring[i].notifyid = notifyid;
rvdev->vring[i].rvdev = rvdev;
return 0;
}
static void __rproc_free_vrings(struct rproc_vdev *rvdev, int i)
{
struct rproc *rproc = rvdev->rproc;
for (i--; i > 0; i--) {
struct rproc_vring *rvring = &rvdev->vring[i];
int size = PAGE_ALIGN(vring_size(rvring->len, AMP_VRING_ALIGN));
dma_free_coherent(rproc->dev, size, rvring->va, rvring->dma);
idr_remove(&rproc->notifyids, rvring->notifyid);
}
}
/**
* rproc_handle_vdev() - handle a vdev fw resource
* @rproc: the remote processor
* @rsc: the vring resource descriptor
* @avail: size of available data (for sanity checking the image)
*
* This resource entry requires allocation of non-cacheable memory
* for a virtio vring. Currently we only support two vrings per remote
* processor, required for the virtio rpmsg device.
* This resource entry requests the host to statically register a virtio
* device (vdev), and setup everything needed to support it. It contains
* everything needed to make it possible: the virtio device id, virtio
* device features, vrings information, virtio config space, etc...
*
* The 'len' member of @rsc should contain the number of buffers this vring
* support and 'da' should either contain the device address where
* the remote processor is expecting the vring, or indicate that
* dynamically allocation of the vring's device address is supported.
* Before registering the vdev, the vrings are allocated from non-cacheable
* physically contiguous memory. Currently we only support two vrings per
* remote processor (temporary limitation). We might also want to consider
* doing the vring allocation only later when ->find_vqs() is invoked, and
* then release them upon ->del_vqs().
*
* Note: 'da' is currently not handled. This will be revised when the generic
* iommu-based DMA API will arrive, or a dynanic & non-iommu use case show
* up. Meanwhile, statically-addressed iommu-based images should use
* RSC_DEVMEM resource entries to map their require 'da' to the physical
* address of their base CMA region.
* Note: @da is currently not really handled correctly: we dynamically
* allocate it using the DMA API, ignoring requested hard coded addresses,
* and we don't take care of any required IOMMU programming. This is all
* going to be taken care of when the generic iommu-based DMA API will be
* merged. Meanwhile, statically-addressed iommu-based firmware images should
* use RSC_DEVMEM resource entries to map their required @da to the physical
* address of their base CMA region (ouch, hacky!).
*
* Returns 0 on success, or an appropriate error code otherwise
*/
@ -360,8 +392,8 @@ static int rproc_handle_vdev(struct rproc *rproc, struct fw_rsc_vdev *rsc,
int avail)
{
struct device *dev = rproc->dev;
struct rproc_vdev *rvdev = rproc->rvdev;
int i;
struct rproc_vdev *rvdev;
int i, ret;
/* make sure resource isn't truncated */
if (sizeof(*rsc) + rsc->num_of_vrings * sizeof(struct fw_rsc_vdev_vring)
@ -379,61 +411,41 @@ static int rproc_handle_vdev(struct rproc *rproc, struct fw_rsc_vdev *rsc,
dev_dbg(dev, "vdev rsc: id %d, dfeatures %x, cfg len %d, %d vrings\n",
rsc->id, rsc->dfeatures, rsc->config_len, rsc->num_of_vrings);
/* no vdev is in place ? */
if (!rvdev) {
dev_err(dev, "vring requested without a virtio dev entry\n");
return -EINVAL;
}
/* we currently support two vrings per rproc (for rx and tx) */
if (rsc->num_of_vrings != ARRAY_SIZE(rvdev->vring)) {
/* we currently support only two vrings per rvdev */
if (rsc->num_of_vrings > ARRAY_SIZE(rvdev->vring)) {
dev_err(dev, "too many vrings: %d\n", rsc->num_of_vrings);
return -EINVAL;
}
/* initialize the vrings */
rvdev = kzalloc(sizeof(struct rproc_vdev), GFP_KERNEL);
if (!rvdev)
return -ENOMEM;
rvdev->rproc = rproc;
/* allocate the vrings */
for (i = 0; i < rsc->num_of_vrings; i++) {
struct fw_rsc_vdev_vring *vring = &rsc->vring[i];
dma_addr_t dma;
int size;
void *va;
/* make sure reserved bytes are zeroes */
if (vring->reserved) {
dev_err(dev, "vring rsc has non zero reserved bytes\n");
return -EINVAL;
}
/* the firmware must provide the expected queue size */
if (!vring->num) {
dev_err(dev, "missing expected queue size\n");
/* potential cleanups are taken care of later on */
return -EINVAL;
}
/* actual size of vring (in bytes) */
size = PAGE_ALIGN(vring_size(vring->num, AMP_VRING_ALIGN));
/*
* Allocate non-cacheable memory for the vring. In the future
* this call will also configure the IOMMU for us
*/
va = dma_alloc_coherent(dev, size, &dma, GFP_KERNEL);
if (!va) {
dev_err(dev, "dma_alloc_coherent failed\n");
/* potential cleanups are taken care of later on */
return -EINVAL;
}
dev_dbg(dev, "vring%d: va %p dma %x qsz %d ring size %x\n", i,
va, dma, vring->num, size);
rvdev->vring[i].len = vring->num;
rvdev->vring[i].va = va;
rvdev->vring[i].dma = dma;
ret = __rproc_handle_vring(rvdev, rsc, i);
if (ret)
goto free_vrings;
}
/* remember the device features */
rvdev->dfeatures = rsc->dfeatures;
list_add_tail(&rvdev->node, &rproc->rvdevs);
/* it is now safe to add the virtio device */
ret = rproc_add_virtio_dev(rvdev, rsc->id);
if (ret)
goto free_vrings;
return 0;
free_vrings:
__rproc_free_vrings(rvdev, i);
kfree(rvdev);
return ret;
}
/**
@ -731,7 +743,7 @@ static rproc_handle_resource_t rproc_handle_rsc[] = {
[RSC_CARVEOUT] = (rproc_handle_resource_t)rproc_handle_carveout,
[RSC_DEVMEM] = (rproc_handle_resource_t)rproc_handle_devmem,
[RSC_TRACE] = (rproc_handle_resource_t)rproc_handle_trace,
[RSC_VDEV] = (rproc_handle_resource_t)rproc_handle_vdev,
[RSC_VDEV] = NULL, /* VDEVs were handled upon registrarion */
};
/* handle firmware resource entries before booting the remote processor */
@ -784,6 +796,7 @@ rproc_handle_virtio_rsc(struct rproc *rproc, struct resource_table *table, int l
int offset = table->offset[i];
struct fw_rsc_hdr *hdr = (void *)table + offset;
int avail = len - offset - sizeof(*hdr);
struct fw_rsc_vdev *vrsc;
/* make sure table isn't truncated */
if (avail < 0) {
@ -793,12 +806,14 @@ rproc_handle_virtio_rsc(struct rproc *rproc, struct resource_table *table, int l
dev_dbg(dev, "%s: rsc type %d\n", __func__, hdr->type);
if (hdr->type == RSC_VDEV) {
struct fw_rsc_vdev *vrsc =
(struct fw_rsc_vdev *)hdr->data;
ret = rproc_handle_early_vdev(rproc, vrsc, avail);
if (hdr->type != RSC_VDEV)
continue;
vrsc = (struct fw_rsc_vdev *)hdr->data;
ret = rproc_handle_vdev(rproc, vrsc, avail);
if (ret)
break;
}
}
return ret;
@ -889,14 +904,12 @@ static int rproc_handle_resources(struct rproc *rproc, const u8 *elf_data,
* @rproc: rproc handle
*
* This function will free all resources acquired for @rproc, and it
* is called when @rproc shuts down, or just failed booting.
* is called whenever @rproc either shuts down or fails to boot.
*/
static void rproc_resource_cleanup(struct rproc *rproc)
{
struct rproc_mem_entry *entry, *tmp;
struct device *dev = rproc->dev;
struct rproc_vdev *rvdev = rproc->rvdev;
int i;
/* clean up debugfs trace entries */
list_for_each_entry_safe(entry, tmp, &rproc->traces, node) {
@ -906,23 +919,6 @@ static void rproc_resource_cleanup(struct rproc *rproc)
kfree(entry);
}
/* free the coherent memory allocated for the vrings */
for (i = 0; rvdev && i < ARRAY_SIZE(rvdev->vring); i++) {
int qsz = rvdev->vring[i].len;
void *va = rvdev->vring[i].va;
int dma = rvdev->vring[i].dma;
/* virtqueue size is expressed in number of buffers supported */
if (qsz) {
/* how many bytes does this vring really occupy ? */
int size = PAGE_ALIGN(vring_size(qsz, AMP_VRING_ALIGN));
dma_free_coherent(rproc->dev, size, va, dma);
rvdev->vring[i].len = 0;
}
}
/* clean up carveout allocations */
list_for_each_entry_safe(entry, tmp, &rproc->carveouts, node) {
dma_free_coherent(dev, entry->len, entry->va, entry->dma);
@ -1100,11 +1096,6 @@ static void rproc_fw_config_virtio(const struct firmware *fw, void *context)
goto out;
}
/* add the virtio device (currently only rpmsg vdevs are supported) */
ret = rproc_add_rpmsg_vdev(rproc);
if (ret)
goto out;
out:
if (fw)
release_firmware(fw);
@ -1266,13 +1257,23 @@ EXPORT_SYMBOL(rproc_shutdown);
void rproc_release(struct kref *kref)
{
struct rproc *rproc = container_of(kref, struct rproc, refcount);
struct rproc_vdev *rvdev, *rvtmp;
dev_info(rproc->dev, "removing %s\n", rproc->name);
rproc_delete_debug_dir(rproc);
/* at this point no one holds a reference to rproc anymore */
kfree(rproc);
/* clean up remote vdev entries */
list_for_each_entry_safe(rvdev, rvtmp, &rproc->rvdevs, node) {
__rproc_free_vrings(rvdev, RVDEV_NUM_VRINGS);
list_del(&rvdev->node);
}
/*
* At this point no one holds a reference to rproc anymore,
* so we can directly unroll rproc_alloc()
*/
rproc_free(rproc);
}
/* will be called when an rproc is added to the rprocs klist */
@ -1316,7 +1317,7 @@ static struct rproc *next_rproc(struct klist_iter *i)
* use rproc_put() to decrement it back once rproc isn't needed anymore.
*
* Note: currently this function (and its counterpart rproc_put()) are not
* used anymore by the rpmsg subsystem. We need to scrutinize the use cases
* being used. We need to scrutinize the use cases
* that still need them, and see if we can migrate them to use the non
* name-based boot/shutdown interface.
*/
@ -1391,11 +1392,8 @@ EXPORT_SYMBOL(rproc_put);
* firmware.
*
* If found, those virtio devices will be created and added, so as a result
* of registering this remote processor, additional virtio drivers will be
* of registering this remote processor, additional virtio drivers might be
* probed.
*
* Currently, though, we only support a single RPMSG virtio vdev per remote
* processor.
*/
int rproc_register(struct rproc *rproc)
{
@ -1418,7 +1416,7 @@ int rproc_register(struct rproc *rproc)
/*
* We must retrieve early virtio configuration info from
* the firmware (e.g. whether to register a virtio rpmsg device,
* the firmware (e.g. whether to register a virtio device,
* what virtio features does it support, ...).
*
* We're initiating an asynchronous firmware loading, so we can
@ -1487,9 +1485,12 @@ struct rproc *rproc_alloc(struct device *dev, const char *name,
mutex_init(&rproc->lock);
idr_init(&rproc->notifyids);
INIT_LIST_HEAD(&rproc->carveouts);
INIT_LIST_HEAD(&rproc->mappings);
INIT_LIST_HEAD(&rproc->traces);
INIT_LIST_HEAD(&rproc->rvdevs);
rproc->state = RPROC_OFFLINE;
@ -1509,6 +1510,9 @@ EXPORT_SYMBOL(rproc_alloc);
*/
void rproc_free(struct rproc *rproc)
{
idr_remove_all(&rproc->notifyids);
idr_destroy(&rproc->notifyids);
kfree(rproc);
}
EXPORT_SYMBOL(rproc_free);
@ -1535,18 +1539,22 @@ EXPORT_SYMBOL(rproc_free);
*/
int rproc_unregister(struct rproc *rproc)
{
struct rproc_vdev *rvdev;
if (!rproc)
return -EINVAL;
/* if rproc is just being registered, wait */
wait_for_completion(&rproc->firmware_loading_complete);
/* was an rpmsg vdev created ? */
if (rproc->rvdev)
rproc_remove_rpmsg_vdev(rproc);
/* clean up remote vdev entries */
list_for_each_entry(rvdev, &rproc->rvdevs, node)
rproc_remove_virtio_dev(rvdev);
klist_remove(&rproc->node);
/* the rproc is downref'ed as soon as it's removed from the klist */
klist_del(&rproc->node);
/* the rproc will only be released after its refcount drops to zero */
kref_put(&rproc->refcount, rproc_release);
return 0;

6
drivers/remoteproc/remoteproc_internal.h
View file

@ -28,9 +28,9 @@ struct rproc;
void rproc_release(struct kref *kref);
irqreturn_t rproc_vq_interrupt(struct rproc *rproc, int vq_id);
/* from remoteproc_rpmsg.c */
int rproc_add_rpmsg_vdev(struct rproc *);
void rproc_remove_rpmsg_vdev(struct rproc *rproc);
/* from remoteproc_virtio.c */
int rproc_add_virtio_dev(struct rproc_vdev *rvdev, int id);
void rproc_remove_virtio_dev(struct rproc_vdev *rvdev);
/* from remoteproc_debugfs.c */
void rproc_remove_trace_file(struct dentry *tfile);

140
drivers/remoteproc/remoteproc_virtio.c
View file

@ -19,7 +19,6 @@
#include <linux/export.h>
#include <linux/remoteproc.h>
#include <linux/rpmsg.h>
#include <linux/virtio.h>
#include <linux/virtio_config.h>
#include <linux/virtio_ids.h>
@ -30,45 +29,41 @@
#include "remoteproc_internal.h"
/**
* struct rproc_virtio_vq_info - virtqueue state
* @vq_id: a unique index of this virtqueue (unique for this @rproc)
* @rproc: handle to the remote processor
*
* Such a struct will be maintained for every virtqueue we're
* using to communicate with the remote processor
*/
struct rproc_virtio_vq_info {
__u16 vq_id;
struct rproc *rproc;
};
/* kick the remote processor, and let it know which virtqueue to poke at */
static void rproc_virtio_notify(struct virtqueue *vq)
{
struct rproc_virtio_vq_info *rpvq = vq->priv;
struct rproc *rproc = rpvq->rproc;
struct rproc_vring *rvring = vq->priv;
struct rproc *rproc = rvring->rvdev->rproc;
int notifyid = rvring->notifyid;
dev_dbg(rproc->dev, "kicking vq id: %d\n", rpvq->vq_id);
dev_dbg(rproc->dev, "kicking vq index: %d\n", notifyid);
rproc->ops->kick(rproc, rpvq->vq_id);
rproc->ops->kick(rproc, notifyid);
}
/**
* rproc_vq_interrupt() - tell remoteproc that a virtqueue is interrupted
* @rproc: handle to the remote processor
* @vq_id: index of the signalled virtqueue
* @notifyid: index of the signalled virtqueue (unique per this @rproc)
*
* This function should be called by the platform-specific rproc driver,
* when the remote processor signals that a specific virtqueue has pending
* messages available.
*
* Returns IRQ_NONE if no message was found in the @vq_id virtqueue,
* Returns IRQ_NONE if no message was found in the @notifyid virtqueue,
* and otherwise returns IRQ_HANDLED.
*/
irqreturn_t rproc_vq_interrupt(struct rproc *rproc, int vq_id)
irqreturn_t rproc_vq_interrupt(struct rproc *rproc, int notifyid)
{
return vring_interrupt(0, rproc->rvdev->vq[vq_id]);
struct rproc_vring *rvring;
dev_dbg(rproc->dev, "vq index %d is interrupted\n", notifyid);
rvring = idr_find(&rproc->notifyids, notifyid);
if (!rvring || !rvring->vq)
return IRQ_NONE;
return vring_interrupt(0, rvring->vq);
}
EXPORT_SYMBOL(rproc_vq_interrupt);
@ -77,24 +72,28 @@ static struct virtqueue *rp_find_vq(struct virtio_device *vdev,
void (*callback)(struct virtqueue *vq),
const char *name)
{
struct rproc_vdev *rvdev = vdev_to_rvdev(vdev);
struct rproc *rproc = vdev_to_rproc(vdev);
struct rproc_vdev *rvdev = rproc->rvdev;
struct rproc_virtio_vq_info *rpvq;
struct rproc_vring *rvring;
struct virtqueue *vq;
void *addr;
int ret, len;
int len, size;
rpvq = kmalloc(sizeof(*rpvq), GFP_KERNEL);
if (!rpvq)
return ERR_PTR(-ENOMEM);
/* we're temporarily limited to two virtqueues per rvdev */
if (id >= ARRAY_SIZE(rvdev->vring))
return ERR_PTR(-EINVAL);
rpvq->rproc = rproc;
rpvq->vq_id = id;
rvring = &rvdev->vring[id];
addr = rvdev->vring[id].va;
len = rvdev->vring[id].len;
addr = rvring->va;
len = rvring->len;
dev_dbg(rproc->dev, "vring%d: va %p qsz %d\n", id, addr, len);
/* zero vring */
size = vring_size(len, rvring->align);
memset(addr, 0, size);
dev_dbg(rproc->dev, "vring%d: va %p qsz %d notifyid %d\n",
id, addr, len, rvring->notifyid);
/*
* Create the new vq, and tell virtio we're not interested in
@ -104,32 +103,28 @@ static struct virtqueue *rp_find_vq(struct virtio_device *vdev,
rproc_virtio_notify, callback, name);
if (!vq) {
dev_err(rproc->dev, "vring_new_virtqueue %s failed\n", name);
ret = -ENOMEM;
goto free_rpvq;
return ERR_PTR(-ENOMEM);
}
rvdev->vq[id] = vq;
vq->priv = rpvq;
rvring->vq = vq;
vq->priv = rvring;
return vq;
free_rpvq:
kfree(rpvq);
return ERR_PTR(ret);
}
static void rproc_virtio_del_vqs(struct virtio_device *vdev)
{
struct virtqueue *vq, *n;
struct rproc *rproc = vdev_to_rproc(vdev);
struct rproc_vring *rvring;
/* power down the remote processor before deleting vqs */
rproc_shutdown(rproc);
list_for_each_entry_safe(vq, n, &vdev->vqs, list) {
struct rproc_virtio_vq_info *rpvq = vq->priv;
rvring = vq->priv;
rvring->vq = NULL;
vring_del_virtqueue(vq);
kfree(rpvq);
}
}
@ -141,10 +136,6 @@ static int rproc_virtio_find_vqs(struct virtio_device *vdev, unsigned nvqs,
struct rproc *rproc = vdev_to_rproc(vdev);
int i, ret;
/* we maintain two virtqueues per remote processor (for RX and TX) */
if (nvqs != 2)
return -EINVAL;
for (i = 0; i < nvqs; ++i) {
vqs[i] = rp_find_vq(vdev, i, callbacks[i], names[i]);
if (IS_ERR(vqs[i])) {
@ -170,7 +161,7 @@ static int rproc_virtio_find_vqs(struct virtio_device *vdev, unsigned nvqs,
/*
* We don't support yet real virtio status semantics.
*
* The plan is to provide this via the VIRTIO HDR resource entry
* The plan is to provide this via the VDEV resource entry
* which is part of the firmware: this way the remote processor
* will be able to access the status values as set by us.
*/
@ -181,7 +172,7 @@ static u8 rproc_virtio_get_status(struct virtio_device *vdev)
static void rproc_virtio_set_status(struct virtio_device *vdev, u8 status)
{
dev_dbg(&vdev->dev, "new status: %d\n", status);
dev_dbg(&vdev->dev, "status: %d\n", status);
}
static void rproc_virtio_reset(struct virtio_device *vdev)
@ -192,15 +183,14 @@ static void rproc_virtio_reset(struct virtio_device *vdev)
/* provide the vdev features as retrieved from the firmware */
static u32 rproc_virtio_get_features(struct virtio_device *vdev)
{
struct rproc *rproc = vdev_to_rproc(vdev);
struct rproc_vdev *rvdev = vdev_to_rvdev(vdev);
/* we only support a single vdev device for now */
return rproc->rvdev->dfeatures;
return rvdev->dfeatures;
}
static void rproc_virtio_finalize_features(struct virtio_device *vdev)
{
struct rproc *rproc = vdev_to_rproc(vdev);
struct rproc_vdev *rvdev = vdev_to_rvdev(vdev);
/* Give virtio_ring a chance to accept features */
vring_transport_features(vdev);
@ -214,7 +204,7 @@ static void rproc_virtio_finalize_features(struct virtio_device *vdev)
* fixed as part of a small resource table overhaul and then an
* extension of the virtio resource entries.
*/
rproc->rvdev->gfeatures = vdev->features[0];
rvdev->gfeatures = vdev->features[0];
}
static struct virtio_config_ops rproc_virtio_config_ops = {
@ -244,26 +234,25 @@ static void rproc_vdev_release(struct device *dev)
}
/**
* rproc_add_rpmsg_vdev() - create an rpmsg virtio device
* @rproc: the rproc handle
* rproc_add_virtio_dev() - register an rproc-induced virtio device
* @rvdev: the remote vdev
*
* This function is called if virtio rpmsg support was found in the
* firmware of the remote processor.
* This function registers a virtio device. This vdev's partent is
* the rproc device.
*
* Today we only support creating a single rpmsg vdev (virtio device),
* but the plan is to remove this limitation. At that point this interface
* will be revised/extended.
* Returns 0 on success or an appropriate error value otherwise.
*/
int rproc_add_rpmsg_vdev(struct rproc *rproc)
int rproc_add_virtio_dev(struct rproc_vdev *rvdev, int id)
{
struct rproc *rproc = rvdev->rproc;
struct device *dev = rproc->dev;
struct rproc_vdev *rvdev = rproc->rvdev;
struct virtio_device *vdev = &rvdev->vdev;
int ret;
rvdev->vdev.id.device = VIRTIO_ID_RPMSG,
rvdev->vdev.config = &rproc_virtio_config_ops,
rvdev->vdev.dev.parent = dev;
rvdev->vdev.dev.release = rproc_vdev_release;
vdev->id.device = id,
vdev->config = &rproc_virtio_config_ops,
vdev->dev.parent = dev;
vdev->dev.release = rproc_vdev_release;
/*
* We're indirectly making a non-temporary copy of the rproc pointer
@ -275,25 +264,26 @@ int rproc_add_rpmsg_vdev(struct rproc *rproc)
*/
kref_get(&rproc->refcount);
ret = register_virtio_device(&rvdev->vdev);
ret = register_virtio_device(vdev);
if (ret) {
kref_put(&rproc->refcount, rproc_release);
dev_err(dev, "failed to register vdev: %d\n", ret);
goto out;
}
dev_info(dev, "registered %s (type %d)\n", dev_name(&vdev->dev), id);
out:
return ret;
}
/**
* rproc_remove_rpmsg_vdev() - remove an rpmsg vdev device
* @rproc: the rproc handle
* rproc_remove_virtio_dev() - remove an rproc-induced virtio device
* @rvdev: the remote vdev
*
* This function is called whenever @rproc is removed _iff_ an rpmsg
* vdev was created beforehand.
* This function unregisters an existing virtio device.
*/
void rproc_remove_rpmsg_vdev(struct rproc *rproc)
void rproc_remove_virtio_dev(struct rproc_vdev *rvdev)
{
struct rproc_vdev *rvdev = rproc->rvdev;
unregister_virtio_device(&rvdev->vdev);
}

41
include/linux/remoteproc.h
View file

@ -41,6 +41,7 @@
#include <linux/mutex.h>
#include <linux/virtio.h>
#include <linux/completion.h>
#include <linux/idr.h>
/*
* The alignment between the consumer and producer parts of the vring.
@ -387,7 +388,8 @@ enum rproc_state {
* @mappings: list of iommu mappings we initiated, needed on shutdown
* @firmware_loading_complete: marks e/o asynchronous firmware loading
* @bootaddr: address of first instruction to boot rproc with (optional)
* @rvdev: virtio device (we only support a single rpmsg virtio device for now)
* @rvdevs: list of remote virtio devices
* @notifyids: idr for dynamically assigning rproc-wide unique notify ids
*/
struct rproc {
struct klist_node node;
@ -408,23 +410,47 @@ struct rproc {
struct list_head mappings;
struct completion firmware_loading_complete;
u32 bootaddr;
struct list_head rvdevs;
struct idr notifyids;
};
/* we currently support only two vrings per rvdev */
#define RVDEV_NUM_VRINGS 2
/**
* struct rproc_vring - remoteproc vring state
* @va: virtual address
* @dma: dma address
* @len: length, in bytes
* @da: device address
* @notifyid: rproc-specific unique vring index
* @rvdev: remote vdev
* @vq: the virtqueue of this vring
*/
struct rproc_vring {
void *va;
dma_addr_t dma;
int len;
u32 da;
int notifyid;
struct rproc_vdev *rvdev;
struct virtqueue *vq;
};
/**
* struct rproc_vdev - remoteproc state for a supported virtio device
* @node: list node
* @rproc: the rproc handle
* @vdev: the virio device
* @vq: the virtqueues for this vdev
* @vring: the vrings for this vdev
* @dfeatures: virtio device features
* @gfeatures: virtio guest features
*/
struct rproc_vdev {
struct list_head node;
struct rproc *rproc;
struct virtio_device vdev;
struct virtqueue *vq[2];
struct rproc_mem_entry vring[2];
struct rproc_vring vring[RVDEV_NUM_VRINGS];
unsigned long dfeatures;
unsigned long gfeatures;
};
@ -442,9 +468,14 @@ int rproc_unregister(struct rproc *rproc);
int rproc_boot(struct rproc *rproc);
void rproc_shutdown(struct rproc *rproc);
static inline struct rproc_vdev *vdev_to_rvdev(struct virtio_device *vdev)
{
return container_of(vdev, struct rproc_vdev, vdev);
}
static inline struct rproc *vdev_to_rproc(struct virtio_device *vdev)
{
struct rproc_vdev *rvdev = container_of(vdev, struct rproc_vdev, vdev);
struct rproc_vdev *rvdev = vdev_to_rvdev(vdev);
return rvdev->rproc;
}