[PATCH 4/7] remoteproc: remove the single rpmsg vdev limitation
Ohad Ben-Cohen
ohad at wizery.com
Thu Mar 1 03:11:34 EST 2012
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 at wizery.com>
Cc: Brian Swetland <swetland at google.com>
Cc: Iliyan Malchev <malchev at google.com>
Cc: Arnd Bergmann <arnd at arndb.de>
Cc: Grant Likely <grant.likely at secretlab.ca>
Cc: Rusty Russell <rusty at rustcorp.com.au>
Cc: Mark Grosen <mgrosen at ti.com>
Cc: John Williams <john.williams at petalogix.com>
Cc: Michal Simek <monstr at monstr.eu>
Cc: Loic PALLARDY <loic.pallardy at stericsson.com>
Cc: Ludovic BARRE <ludovic.barre at stericsson.com>
Cc: Omar Ramirez Luna <omar.luna at linaro.org>
Cc: Guzman Lugo Fernando <fernando.lugo at ti.com>
Cc: Anna Suman <s-anna at ti.com>
Cc: Clark Rob <rob at ti.com>
Cc: Stephen Boyd <sboyd at codeaurora.org>
Cc: Saravana Kannan <skannan at codeaurora.org>
Cc: David Brown <davidb at codeaurora.org>
Cc: Kieran Bingham <kieranbingham at gmail.com>
Cc: Tony Lindgren <tony at atomide.com>
---
Documentation/remoteproc.txt | 9 +-
drivers/remoteproc/remoteproc_core.c | 292 +++++++++++++++---------------
drivers/remoteproc/remoteproc_internal.h | 6 +-
drivers/remoteproc/remoteproc_virtio.c | 140 +++++++--------
include/linux/remoteproc.h | 41 ++++-
5 files changed, 260 insertions(+), 228 deletions(-)
diff --git a/Documentation/remoteproc.txt b/Documentation/remoteproc.txt
index 07057ca..70a048c 100644
--- a/Documentation/remoteproc.txt
+++ b/Documentation/remoteproc.txt
@@ -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
diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c
index 1034845..ca02f12 100644
--- a/drivers/remoteproc/remoteproc_core.c
+++ b/drivers/remoteproc/remoteproc_core.c
@@ -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");
+ /* actual size of vring (in bytes) */
+ size = PAGE_ALIGN(vring_size(vring->num, AMP_VRING_ALIGN));
+
+ if (!idr_pre_get(&rproc->notifyids, GFP_KERNEL)) {
+ dev_err(dev, "idr_pre_get failed\n");
+ return -ENOMEM;
+ }
+
+ /*
+ * 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;
}
- rvdev = kzalloc(sizeof(struct rproc_vdev), GFP_KERNEL);
- if (!rvdev)
- return -ENOMEM;
+ /* 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], ¬ifyid);
+ if (ret) {
+ dev_err(dev, "idr_get_new failed: %d\n", ret);
+ dma_free_coherent(dev, size, va, dma);
+ return ret;
+ }
- /* remember the device features */
- rvdev->dfeatures = rsc->dfeatures;
+ /* let the rproc know the da and notifyid of this vring */
+ /* TODO: expose this to remote processor */
+ vring->da = dma;
+ vring->notifyid = notifyid;
- rproc->rvdev = rvdev;
- rvdev->rproc = rproc;
+ 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.
- *
- * 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.
- *
- * 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.
+ * 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...
+ *
+ * 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 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 */
- 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;
- }
+ rvdev = kzalloc(sizeof(struct rproc_vdev), GFP_KERNEL);
+ if (!rvdev)
+ return -ENOMEM;
- /* 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;
- }
+ rvdev->rproc = rproc;
- /* actual size of vring (in bytes) */
- size = PAGE_ALIGN(vring_size(vring->num, AMP_VRING_ALIGN));
+ /* allocate the vrings */
+ for (i = 0; i < rsc->num_of_vrings; i++) {
+ ret = __rproc_handle_vring(rvdev, rsc, i);
+ if (ret)
+ goto free_vrings;
+ }
- /*
- * 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;
- }
+ /* remember the device features */
+ rvdev->dfeatures = rsc->dfeatures;
- dev_dbg(dev, "vring%d: va %p dma %x qsz %d ring size %x\n", i,
- va, dma, vring->num, size);
+ list_add_tail(&rvdev->node, &rproc->rvdevs);
- rvdev->vring[i].len = vring->num;
- rvdev->vring[i].va = va;
- rvdev->vring[i].dma = dma;
- }
+ /* 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;
diff --git a/drivers/remoteproc/remoteproc_internal.h b/drivers/remoteproc/remoteproc_internal.h
index 8b2fc40..9f336d6 100644
--- a/drivers/remoteproc/remoteproc_internal.h
+++ b/drivers/remoteproc/remoteproc_internal.h
@@ -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);
diff --git a/drivers/remoteproc/remoteproc_virtio.c b/drivers/remoteproc/remoteproc_virtio.c
index 78d8527..0700410 100644
--- a/drivers/remoteproc/remoteproc_virtio.c
+++ b/drivers/remoteproc/remoteproc_virtio.c
@@ -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);
+
+ rvring = &rvdev->vring[id];
- rpvq->rproc = rproc;
- rpvq->vq_id = id;
+ addr = rvring->va;
+ len = rvring->len;
- addr = rvdev->vring[id].va;
- len = rvdev->vring[id].len;
+ /* zero vring */
+ size = vring_size(len, rvring->align);
+ memset(addr, 0, size);
- dev_dbg(rproc->dev, "vring%d: va %p qsz %d\n", id, addr, len);
+ 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 @@ error:
/*
* 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);
}
diff --git a/include/linux/remoteproc.h b/include/linux/remoteproc.h
index 6040f83..7750d8a 100644
--- a/include/linux/remoteproc.h
+++ b/include/linux/remoteproc.h
@@ -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;
}
--
1.7.5.4
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