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path: root/drivers/rpmsg/virtio_rpmsg_bus.c
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-rw-r--r--drivers/rpmsg/virtio_rpmsg_bus.c1082
1 files changed, 1082 insertions, 0 deletions
diff --git a/drivers/rpmsg/virtio_rpmsg_bus.c b/drivers/rpmsg/virtio_rpmsg_bus.c
new file mode 100644
index 0000000000..f1af0f6746
--- /dev/null
+++ b/drivers/rpmsg/virtio_rpmsg_bus.c
@@ -0,0 +1,1082 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Virtio-based remote processor messaging bus
+ *
+ * Copyright (C) 2011 Texas Instruments, Inc.
+ * Copyright (C) 2011 Google, Inc.
+ *
+ * Ohad Ben-Cohen <ohad@wizery.com>
+ * Brian Swetland <swetland@google.com>
+ */
+
+#define pr_fmt(fmt) "%s: " fmt, __func__
+
+#include <linux/dma-mapping.h>
+#include <linux/idr.h>
+#include <linux/jiffies.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/rpmsg.h>
+#include <linux/rpmsg/byteorder.h>
+#include <linux/rpmsg/ns.h>
+#include <linux/scatterlist.h>
+#include <linux/slab.h>
+#include <linux/sched.h>
+#include <linux/virtio.h>
+#include <linux/virtio_ids.h>
+#include <linux/virtio_config.h>
+#include <linux/wait.h>
+
+#include "rpmsg_internal.h"
+
+/**
+ * struct virtproc_info - virtual remote processor state
+ * @vdev: the virtio device
+ * @rvq: rx virtqueue
+ * @svq: tx virtqueue
+ * @rbufs: kernel address of rx buffers
+ * @sbufs: kernel address of tx buffers
+ * @num_bufs: total number of buffers for rx and tx
+ * @buf_size: size of one rx or tx buffer
+ * @last_sbuf: index of last tx buffer used
+ * @bufs_dma: dma base addr of the buffers
+ * @tx_lock: protects svq, sbufs and sleepers, to allow concurrent senders.
+ * sending a message might require waking up a dozing remote
+ * processor, which involves sleeping, hence the mutex.
+ * @endpoints: idr of local endpoints, allows fast retrieval
+ * @endpoints_lock: lock of the endpoints set
+ * @sendq: wait queue of sending contexts waiting for a tx buffers
+ * @sleepers: number of senders that are waiting for a tx buffer
+ *
+ * This structure stores the rpmsg state of a given virtio remote processor
+ * device (there might be several virtio proc devices for each physical
+ * remote processor).
+ */
+struct virtproc_info {
+ struct virtio_device *vdev;
+ struct virtqueue *rvq, *svq;
+ void *rbufs, *sbufs;
+ unsigned int num_bufs;
+ unsigned int buf_size;
+ int last_sbuf;
+ dma_addr_t bufs_dma;
+ struct mutex tx_lock;
+ struct idr endpoints;
+ struct mutex endpoints_lock;
+ wait_queue_head_t sendq;
+ atomic_t sleepers;
+};
+
+/* The feature bitmap for virtio rpmsg */
+#define VIRTIO_RPMSG_F_NS 0 /* RP supports name service notifications */
+
+/**
+ * struct rpmsg_hdr - common header for all rpmsg messages
+ * @src: source address
+ * @dst: destination address
+ * @reserved: reserved for future use
+ * @len: length of payload (in bytes)
+ * @flags: message flags
+ * @data: @len bytes of message payload data
+ *
+ * Every message sent(/received) on the rpmsg bus begins with this header.
+ */
+struct rpmsg_hdr {
+ __rpmsg32 src;
+ __rpmsg32 dst;
+ __rpmsg32 reserved;
+ __rpmsg16 len;
+ __rpmsg16 flags;
+ u8 data[];
+} __packed;
+
+
+/**
+ * struct virtio_rpmsg_channel - rpmsg channel descriptor
+ * @rpdev: the rpmsg channel device
+ * @vrp: the virtio remote processor device this channel belongs to
+ *
+ * This structure stores the channel that links the rpmsg device to the virtio
+ * remote processor device.
+ */
+struct virtio_rpmsg_channel {
+ struct rpmsg_device rpdev;
+
+ struct virtproc_info *vrp;
+};
+
+#define to_virtio_rpmsg_channel(_rpdev) \
+ container_of(_rpdev, struct virtio_rpmsg_channel, rpdev)
+
+/*
+ * We're allocating buffers of 512 bytes each for communications. The
+ * number of buffers will be computed from the number of buffers supported
+ * by the vring, upto a maximum of 512 buffers (256 in each direction).
+ *
+ * Each buffer will have 16 bytes for the msg header and 496 bytes for
+ * the payload.
+ *
+ * This will utilize a maximum total space of 256KB for the buffers.
+ *
+ * We might also want to add support for user-provided buffers in time.
+ * This will allow bigger buffer size flexibility, and can also be used
+ * to achieve zero-copy messaging.
+ *
+ * Note that these numbers are purely a decision of this driver - we
+ * can change this without changing anything in the firmware of the remote
+ * processor.
+ */
+#define MAX_RPMSG_NUM_BUFS (512)
+#define MAX_RPMSG_BUF_SIZE (512)
+
+/*
+ * Local addresses are dynamically allocated on-demand.
+ * We do not dynamically assign addresses from the low 1024 range,
+ * in order to reserve that address range for predefined services.
+ */
+#define RPMSG_RESERVED_ADDRESSES (1024)
+
+static void virtio_rpmsg_destroy_ept(struct rpmsg_endpoint *ept);
+static int virtio_rpmsg_send(struct rpmsg_endpoint *ept, void *data, int len);
+static int virtio_rpmsg_sendto(struct rpmsg_endpoint *ept, void *data, int len,
+ u32 dst);
+static int virtio_rpmsg_send_offchannel(struct rpmsg_endpoint *ept, u32 src,
+ u32 dst, void *data, int len);
+static int virtio_rpmsg_trysend(struct rpmsg_endpoint *ept, void *data, int len);
+static int virtio_rpmsg_trysendto(struct rpmsg_endpoint *ept, void *data,
+ int len, u32 dst);
+static int virtio_rpmsg_trysend_offchannel(struct rpmsg_endpoint *ept, u32 src,
+ u32 dst, void *data, int len);
+static ssize_t virtio_rpmsg_get_mtu(struct rpmsg_endpoint *ept);
+static struct rpmsg_device *__rpmsg_create_channel(struct virtproc_info *vrp,
+ struct rpmsg_channel_info *chinfo);
+
+static const struct rpmsg_endpoint_ops virtio_endpoint_ops = {
+ .destroy_ept = virtio_rpmsg_destroy_ept,
+ .send = virtio_rpmsg_send,
+ .sendto = virtio_rpmsg_sendto,
+ .send_offchannel = virtio_rpmsg_send_offchannel,
+ .trysend = virtio_rpmsg_trysend,
+ .trysendto = virtio_rpmsg_trysendto,
+ .trysend_offchannel = virtio_rpmsg_trysend_offchannel,
+ .get_mtu = virtio_rpmsg_get_mtu,
+};
+
+/**
+ * rpmsg_sg_init - initialize scatterlist according to cpu address location
+ * @sg: scatterlist to fill
+ * @cpu_addr: virtual address of the buffer
+ * @len: buffer length
+ *
+ * An internal function filling scatterlist according to virtual address
+ * location (in vmalloc or in kernel).
+ */
+static void
+rpmsg_sg_init(struct scatterlist *sg, void *cpu_addr, unsigned int len)
+{
+ if (is_vmalloc_addr(cpu_addr)) {
+ sg_init_table(sg, 1);
+ sg_set_page(sg, vmalloc_to_page(cpu_addr), len,
+ offset_in_page(cpu_addr));
+ } else {
+ WARN_ON(!virt_addr_valid(cpu_addr));
+ sg_init_one(sg, cpu_addr, len);
+ }
+}
+
+/**
+ * __ept_release() - deallocate an rpmsg endpoint
+ * @kref: the ept's reference count
+ *
+ * This function deallocates an ept, and is invoked when its @kref refcount
+ * drops to zero.
+ *
+ * Never invoke this function directly!
+ */
+static void __ept_release(struct kref *kref)
+{
+ struct rpmsg_endpoint *ept = container_of(kref, struct rpmsg_endpoint,
+ refcount);
+ /*
+ * At this point no one holds a reference to ept anymore,
+ * so we can directly free it
+ */
+ kfree(ept);
+}
+
+/* for more info, see below documentation of rpmsg_create_ept() */
+static struct rpmsg_endpoint *__rpmsg_create_ept(struct virtproc_info *vrp,
+ struct rpmsg_device *rpdev,
+ rpmsg_rx_cb_t cb,
+ void *priv, u32 addr)
+{
+ int id_min, id_max, id;
+ struct rpmsg_endpoint *ept;
+ struct device *dev = rpdev ? &rpdev->dev : &vrp->vdev->dev;
+
+ ept = kzalloc(sizeof(*ept), GFP_KERNEL);
+ if (!ept)
+ return NULL;
+
+ kref_init(&ept->refcount);
+ mutex_init(&ept->cb_lock);
+
+ ept->rpdev = rpdev;
+ ept->cb = cb;
+ ept->priv = priv;
+ ept->ops = &virtio_endpoint_ops;
+
+ /* do we need to allocate a local address ? */
+ if (addr == RPMSG_ADDR_ANY) {
+ id_min = RPMSG_RESERVED_ADDRESSES;
+ id_max = 0;
+ } else {
+ id_min = addr;
+ id_max = addr + 1;
+ }
+
+ mutex_lock(&vrp->endpoints_lock);
+
+ /* bind the endpoint to an rpmsg address (and allocate one if needed) */
+ id = idr_alloc(&vrp->endpoints, ept, id_min, id_max, GFP_KERNEL);
+ if (id < 0) {
+ dev_err(dev, "idr_alloc failed: %d\n", id);
+ goto free_ept;
+ }
+ ept->addr = id;
+
+ mutex_unlock(&vrp->endpoints_lock);
+
+ return ept;
+
+free_ept:
+ mutex_unlock(&vrp->endpoints_lock);
+ kref_put(&ept->refcount, __ept_release);
+ return NULL;
+}
+
+static struct rpmsg_device *virtio_rpmsg_create_channel(struct rpmsg_device *rpdev,
+ struct rpmsg_channel_info *chinfo)
+{
+ struct virtio_rpmsg_channel *vch = to_virtio_rpmsg_channel(rpdev);
+ struct virtproc_info *vrp = vch->vrp;
+
+ return __rpmsg_create_channel(vrp, chinfo);
+}
+
+static int virtio_rpmsg_release_channel(struct rpmsg_device *rpdev,
+ struct rpmsg_channel_info *chinfo)
+{
+ struct virtio_rpmsg_channel *vch = to_virtio_rpmsg_channel(rpdev);
+ struct virtproc_info *vrp = vch->vrp;
+
+ return rpmsg_unregister_device(&vrp->vdev->dev, chinfo);
+}
+
+static struct rpmsg_endpoint *virtio_rpmsg_create_ept(struct rpmsg_device *rpdev,
+ rpmsg_rx_cb_t cb,
+ void *priv,
+ struct rpmsg_channel_info chinfo)
+{
+ struct virtio_rpmsg_channel *vch = to_virtio_rpmsg_channel(rpdev);
+
+ return __rpmsg_create_ept(vch->vrp, rpdev, cb, priv, chinfo.src);
+}
+
+/**
+ * __rpmsg_destroy_ept() - destroy an existing rpmsg endpoint
+ * @vrp: virtproc which owns this ept
+ * @ept: endpoing to destroy
+ *
+ * An internal function which destroy an ept without assuming it is
+ * bound to an rpmsg channel. This is needed for handling the internal
+ * name service endpoint, which isn't bound to an rpmsg channel.
+ * See also __rpmsg_create_ept().
+ */
+static void
+__rpmsg_destroy_ept(struct virtproc_info *vrp, struct rpmsg_endpoint *ept)
+{
+ /* make sure new inbound messages can't find this ept anymore */
+ mutex_lock(&vrp->endpoints_lock);
+ idr_remove(&vrp->endpoints, ept->addr);
+ mutex_unlock(&vrp->endpoints_lock);
+
+ /* make sure in-flight inbound messages won't invoke cb anymore */
+ mutex_lock(&ept->cb_lock);
+ ept->cb = NULL;
+ mutex_unlock(&ept->cb_lock);
+
+ kref_put(&ept->refcount, __ept_release);
+}
+
+static void virtio_rpmsg_destroy_ept(struct rpmsg_endpoint *ept)
+{
+ struct virtio_rpmsg_channel *vch = to_virtio_rpmsg_channel(ept->rpdev);
+
+ __rpmsg_destroy_ept(vch->vrp, ept);
+}
+
+static int virtio_rpmsg_announce_create(struct rpmsg_device *rpdev)
+{
+ struct virtio_rpmsg_channel *vch = to_virtio_rpmsg_channel(rpdev);
+ struct virtproc_info *vrp = vch->vrp;
+ struct device *dev = &rpdev->dev;
+ int err = 0;
+
+ /* need to tell remote processor's name service about this channel ? */
+ if (rpdev->announce && rpdev->ept &&
+ virtio_has_feature(vrp->vdev, VIRTIO_RPMSG_F_NS)) {
+ struct rpmsg_ns_msg nsm;
+
+ strncpy(nsm.name, rpdev->id.name, RPMSG_NAME_SIZE);
+ nsm.addr = cpu_to_rpmsg32(rpdev, rpdev->ept->addr);
+ nsm.flags = cpu_to_rpmsg32(rpdev, RPMSG_NS_CREATE);
+
+ err = rpmsg_sendto(rpdev->ept, &nsm, sizeof(nsm), RPMSG_NS_ADDR);
+ if (err)
+ dev_err(dev, "failed to announce service %d\n", err);
+ }
+
+ return err;
+}
+
+static int virtio_rpmsg_announce_destroy(struct rpmsg_device *rpdev)
+{
+ struct virtio_rpmsg_channel *vch = to_virtio_rpmsg_channel(rpdev);
+ struct virtproc_info *vrp = vch->vrp;
+ struct device *dev = &rpdev->dev;
+ int err = 0;
+
+ /* tell remote processor's name service we're removing this channel */
+ if (rpdev->announce && rpdev->ept &&
+ virtio_has_feature(vrp->vdev, VIRTIO_RPMSG_F_NS)) {
+ struct rpmsg_ns_msg nsm;
+
+ strncpy(nsm.name, rpdev->id.name, RPMSG_NAME_SIZE);
+ nsm.addr = cpu_to_rpmsg32(rpdev, rpdev->ept->addr);
+ nsm.flags = cpu_to_rpmsg32(rpdev, RPMSG_NS_DESTROY);
+
+ err = rpmsg_sendto(rpdev->ept, &nsm, sizeof(nsm), RPMSG_NS_ADDR);
+ if (err)
+ dev_err(dev, "failed to announce service %d\n", err);
+ }
+
+ return err;
+}
+
+static const struct rpmsg_device_ops virtio_rpmsg_ops = {
+ .create_channel = virtio_rpmsg_create_channel,
+ .release_channel = virtio_rpmsg_release_channel,
+ .create_ept = virtio_rpmsg_create_ept,
+ .announce_create = virtio_rpmsg_announce_create,
+ .announce_destroy = virtio_rpmsg_announce_destroy,
+};
+
+static void virtio_rpmsg_release_device(struct device *dev)
+{
+ struct rpmsg_device *rpdev = to_rpmsg_device(dev);
+ struct virtio_rpmsg_channel *vch = to_virtio_rpmsg_channel(rpdev);
+
+ kfree(rpdev->driver_override);
+ kfree(vch);
+}
+
+/*
+ * create an rpmsg channel using its name and address info.
+ * this function will be used to create both static and dynamic
+ * channels.
+ */
+static struct rpmsg_device *__rpmsg_create_channel(struct virtproc_info *vrp,
+ struct rpmsg_channel_info *chinfo)
+{
+ struct virtio_rpmsg_channel *vch;
+ struct rpmsg_device *rpdev;
+ struct device *tmp, *dev = &vrp->vdev->dev;
+ int ret;
+
+ /* make sure a similar channel doesn't already exist */
+ tmp = rpmsg_find_device(dev, chinfo);
+ if (tmp) {
+ /* decrement the matched device's refcount back */
+ put_device(tmp);
+ dev_err(dev, "channel %s:%x:%x already exist\n",
+ chinfo->name, chinfo->src, chinfo->dst);
+ return NULL;
+ }
+
+ vch = kzalloc(sizeof(*vch), GFP_KERNEL);
+ if (!vch)
+ return NULL;
+
+ /* Link the channel to our vrp */
+ vch->vrp = vrp;
+
+ /* Assign public information to the rpmsg_device */
+ rpdev = &vch->rpdev;
+ rpdev->src = chinfo->src;
+ rpdev->dst = chinfo->dst;
+ rpdev->ops = &virtio_rpmsg_ops;
+ rpdev->little_endian = virtio_is_little_endian(vrp->vdev);
+
+ /*
+ * rpmsg server channels has predefined local address (for now),
+ * and their existence needs to be announced remotely
+ */
+ rpdev->announce = rpdev->src != RPMSG_ADDR_ANY;
+
+ strncpy(rpdev->id.name, chinfo->name, RPMSG_NAME_SIZE);
+
+ rpdev->dev.parent = &vrp->vdev->dev;
+ rpdev->dev.release = virtio_rpmsg_release_device;
+ ret = rpmsg_register_device(rpdev);
+ if (ret)
+ return NULL;
+
+ return rpdev;
+}
+
+/* super simple buffer "allocator" that is just enough for now */
+static void *get_a_tx_buf(struct virtproc_info *vrp)
+{
+ unsigned int len;
+ void *ret;
+
+ /* support multiple concurrent senders */
+ mutex_lock(&vrp->tx_lock);
+
+ /*
+ * either pick the next unused tx buffer
+ * (half of our buffers are used for sending messages)
+ */
+ if (vrp->last_sbuf < vrp->num_bufs / 2)
+ ret = vrp->sbufs + vrp->buf_size * vrp->last_sbuf++;
+ /* or recycle a used one */
+ else
+ ret = virtqueue_get_buf(vrp->svq, &len);
+
+ mutex_unlock(&vrp->tx_lock);
+
+ return ret;
+}
+
+/**
+ * rpmsg_upref_sleepers() - enable "tx-complete" interrupts, if needed
+ * @vrp: virtual remote processor state
+ *
+ * This function is called before a sender is blocked, waiting for
+ * a tx buffer to become available.
+ *
+ * If we already have blocking senders, this function merely increases
+ * the "sleepers" reference count, and exits.
+ *
+ * Otherwise, if this is the first sender to block, we also enable
+ * virtio's tx callbacks, so we'd be immediately notified when a tx
+ * buffer is consumed (we rely on virtio's tx callback in order
+ * to wake up sleeping senders as soon as a tx buffer is used by the
+ * remote processor).
+ */
+static void rpmsg_upref_sleepers(struct virtproc_info *vrp)
+{
+ /* support multiple concurrent senders */
+ mutex_lock(&vrp->tx_lock);
+
+ /* are we the first sleeping context waiting for tx buffers ? */
+ if (atomic_inc_return(&vrp->sleepers) == 1)
+ /* enable "tx-complete" interrupts before dozing off */
+ virtqueue_enable_cb(vrp->svq);
+
+ mutex_unlock(&vrp->tx_lock);
+}
+
+/**
+ * rpmsg_downref_sleepers() - disable "tx-complete" interrupts, if needed
+ * @vrp: virtual remote processor state
+ *
+ * This function is called after a sender, that waited for a tx buffer
+ * to become available, is unblocked.
+ *
+ * If we still have blocking senders, this function merely decreases
+ * the "sleepers" reference count, and exits.
+ *
+ * Otherwise, if there are no more blocking senders, we also disable
+ * virtio's tx callbacks, to avoid the overhead incurred with handling
+ * those (now redundant) interrupts.
+ */
+static void rpmsg_downref_sleepers(struct virtproc_info *vrp)
+{
+ /* support multiple concurrent senders */
+ mutex_lock(&vrp->tx_lock);
+
+ /* are we the last sleeping context waiting for tx buffers ? */
+ if (atomic_dec_and_test(&vrp->sleepers))
+ /* disable "tx-complete" interrupts */
+ virtqueue_disable_cb(vrp->svq);
+
+ mutex_unlock(&vrp->tx_lock);
+}
+
+/**
+ * rpmsg_send_offchannel_raw() - send a message across to the remote processor
+ * @rpdev: the rpmsg channel
+ * @src: source address
+ * @dst: destination address
+ * @data: payload of message
+ * @len: length of payload
+ * @wait: indicates whether caller should block in case no TX buffers available
+ *
+ * This function is the base implementation for all of the rpmsg sending API.
+ *
+ * It will send @data of length @len to @dst, and say it's from @src. The
+ * message will be sent to the remote processor which the @rpdev channel
+ * belongs to.
+ *
+ * The message is sent using one of the TX buffers that are available for
+ * communication with this remote processor.
+ *
+ * If @wait is true, the caller will be blocked until either a TX buffer is
+ * available, or 15 seconds elapses (we don't want callers to
+ * sleep indefinitely due to misbehaving remote processors), and in that
+ * case -ERESTARTSYS is returned. The number '15' itself was picked
+ * arbitrarily; there's little point in asking drivers to provide a timeout
+ * value themselves.
+ *
+ * Otherwise, if @wait is false, and there are no TX buffers available,
+ * the function will immediately fail, and -ENOMEM will be returned.
+ *
+ * Normally drivers shouldn't use this function directly; instead, drivers
+ * should use the appropriate rpmsg_{try}send{to, _offchannel} API
+ * (see include/linux/rpmsg.h).
+ *
+ * Return: 0 on success and an appropriate error value on failure.
+ */
+static int rpmsg_send_offchannel_raw(struct rpmsg_device *rpdev,
+ u32 src, u32 dst,
+ void *data, int len, bool wait)
+{
+ struct virtio_rpmsg_channel *vch = to_virtio_rpmsg_channel(rpdev);
+ struct virtproc_info *vrp = vch->vrp;
+ struct device *dev = &rpdev->dev;
+ struct scatterlist sg;
+ struct rpmsg_hdr *msg;
+ int err;
+
+ /* bcasting isn't allowed */
+ if (src == RPMSG_ADDR_ANY || dst == RPMSG_ADDR_ANY) {
+ dev_err(dev, "invalid addr (src 0x%x, dst 0x%x)\n", src, dst);
+ return -EINVAL;
+ }
+
+ /*
+ * We currently use fixed-sized buffers, and therefore the payload
+ * length is limited.
+ *
+ * One of the possible improvements here is either to support
+ * user-provided buffers (and then we can also support zero-copy
+ * messaging), or to improve the buffer allocator, to support
+ * variable-length buffer sizes.
+ */
+ if (len > vrp->buf_size - sizeof(struct rpmsg_hdr)) {
+ dev_err(dev, "message is too big (%d)\n", len);
+ return -EMSGSIZE;
+ }
+
+ /* grab a buffer */
+ msg = get_a_tx_buf(vrp);
+ if (!msg && !wait)
+ return -ENOMEM;
+
+ /* no free buffer ? wait for one (but bail after 15 seconds) */
+ while (!msg) {
+ /* enable "tx-complete" interrupts, if not already enabled */
+ rpmsg_upref_sleepers(vrp);
+
+ /*
+ * sleep until a free buffer is available or 15 secs elapse.
+ * the timeout period is not configurable because there's
+ * little point in asking drivers to specify that.
+ * if later this happens to be required, it'd be easy to add.
+ */
+ err = wait_event_interruptible_timeout(vrp->sendq,
+ (msg = get_a_tx_buf(vrp)),
+ msecs_to_jiffies(15000));
+
+ /* disable "tx-complete" interrupts if we're the last sleeper */
+ rpmsg_downref_sleepers(vrp);
+
+ /* timeout ? */
+ if (!err) {
+ dev_err(dev, "timeout waiting for a tx buffer\n");
+ return -ERESTARTSYS;
+ }
+ }
+
+ msg->len = cpu_to_rpmsg16(rpdev, len);
+ msg->flags = 0;
+ msg->src = cpu_to_rpmsg32(rpdev, src);
+ msg->dst = cpu_to_rpmsg32(rpdev, dst);
+ msg->reserved = 0;
+ memcpy(msg->data, data, len);
+
+ dev_dbg(dev, "TX From 0x%x, To 0x%x, Len %d, Flags %d, Reserved %d\n",
+ src, dst, len, msg->flags, msg->reserved);
+#if defined(CONFIG_DYNAMIC_DEBUG)
+ dynamic_hex_dump("rpmsg_virtio TX: ", DUMP_PREFIX_NONE, 16, 1,
+ msg, sizeof(*msg) + len, true);
+#endif
+
+ rpmsg_sg_init(&sg, msg, sizeof(*msg) + len);
+
+ mutex_lock(&vrp->tx_lock);
+
+ /* add message to the remote processor's virtqueue */
+ err = virtqueue_add_outbuf(vrp->svq, &sg, 1, msg, GFP_KERNEL);
+ if (err) {
+ /*
+ * need to reclaim the buffer here, otherwise it's lost
+ * (memory won't leak, but rpmsg won't use it again for TX).
+ * this will wait for a buffer management overhaul.
+ */
+ dev_err(dev, "virtqueue_add_outbuf failed: %d\n", err);
+ goto out;
+ }
+
+ /* tell the remote processor it has a pending message to read */
+ virtqueue_kick(vrp->svq);
+out:
+ mutex_unlock(&vrp->tx_lock);
+ return err;
+}
+
+static int virtio_rpmsg_send(struct rpmsg_endpoint *ept, void *data, int len)
+{
+ struct rpmsg_device *rpdev = ept->rpdev;
+ u32 src = ept->addr, dst = rpdev->dst;
+
+ return rpmsg_send_offchannel_raw(rpdev, src, dst, data, len, true);
+}
+
+static int virtio_rpmsg_sendto(struct rpmsg_endpoint *ept, void *data, int len,
+ u32 dst)
+{
+ struct rpmsg_device *rpdev = ept->rpdev;
+ u32 src = ept->addr;
+
+ return rpmsg_send_offchannel_raw(rpdev, src, dst, data, len, true);
+}
+
+static int virtio_rpmsg_send_offchannel(struct rpmsg_endpoint *ept, u32 src,
+ u32 dst, void *data, int len)
+{
+ struct rpmsg_device *rpdev = ept->rpdev;
+
+ return rpmsg_send_offchannel_raw(rpdev, src, dst, data, len, true);
+}
+
+static int virtio_rpmsg_trysend(struct rpmsg_endpoint *ept, void *data, int len)
+{
+ struct rpmsg_device *rpdev = ept->rpdev;
+ u32 src = ept->addr, dst = rpdev->dst;
+
+ return rpmsg_send_offchannel_raw(rpdev, src, dst, data, len, false);
+}
+
+static int virtio_rpmsg_trysendto(struct rpmsg_endpoint *ept, void *data,
+ int len, u32 dst)
+{
+ struct rpmsg_device *rpdev = ept->rpdev;
+ u32 src = ept->addr;
+
+ return rpmsg_send_offchannel_raw(rpdev, src, dst, data, len, false);
+}
+
+static int virtio_rpmsg_trysend_offchannel(struct rpmsg_endpoint *ept, u32 src,
+ u32 dst, void *data, int len)
+{
+ struct rpmsg_device *rpdev = ept->rpdev;
+
+ return rpmsg_send_offchannel_raw(rpdev, src, dst, data, len, false);
+}
+
+static ssize_t virtio_rpmsg_get_mtu(struct rpmsg_endpoint *ept)
+{
+ struct rpmsg_device *rpdev = ept->rpdev;
+ struct virtio_rpmsg_channel *vch = to_virtio_rpmsg_channel(rpdev);
+
+ return vch->vrp->buf_size - sizeof(struct rpmsg_hdr);
+}
+
+static int rpmsg_recv_single(struct virtproc_info *vrp, struct device *dev,
+ struct rpmsg_hdr *msg, unsigned int len)
+{
+ struct rpmsg_endpoint *ept;
+ struct scatterlist sg;
+ bool little_endian = virtio_is_little_endian(vrp->vdev);
+ unsigned int msg_len = __rpmsg16_to_cpu(little_endian, msg->len);
+ int err;
+
+ dev_dbg(dev, "From: 0x%x, To: 0x%x, Len: %d, Flags: %d, Reserved: %d\n",
+ __rpmsg32_to_cpu(little_endian, msg->src),
+ __rpmsg32_to_cpu(little_endian, msg->dst), msg_len,
+ __rpmsg16_to_cpu(little_endian, msg->flags),
+ __rpmsg32_to_cpu(little_endian, msg->reserved));
+#if defined(CONFIG_DYNAMIC_DEBUG)
+ dynamic_hex_dump("rpmsg_virtio RX: ", DUMP_PREFIX_NONE, 16, 1,
+ msg, sizeof(*msg) + msg_len, true);
+#endif
+
+ /*
+ * We currently use fixed-sized buffers, so trivially sanitize
+ * the reported payload length.
+ */
+ if (len > vrp->buf_size ||
+ msg_len > (len - sizeof(struct rpmsg_hdr))) {
+ dev_warn(dev, "inbound msg too big: (%d, %d)\n", len, msg_len);
+ return -EINVAL;
+ }
+
+ /* use the dst addr to fetch the callback of the appropriate user */
+ mutex_lock(&vrp->endpoints_lock);
+
+ ept = idr_find(&vrp->endpoints, __rpmsg32_to_cpu(little_endian, msg->dst));
+
+ /* let's make sure no one deallocates ept while we use it */
+ if (ept)
+ kref_get(&ept->refcount);
+
+ mutex_unlock(&vrp->endpoints_lock);
+
+ if (ept) {
+ /* make sure ept->cb doesn't go away while we use it */
+ mutex_lock(&ept->cb_lock);
+
+ if (ept->cb)
+ ept->cb(ept->rpdev, msg->data, msg_len, ept->priv,
+ __rpmsg32_to_cpu(little_endian, msg->src));
+
+ mutex_unlock(&ept->cb_lock);
+
+ /* farewell, ept, we don't need you anymore */
+ kref_put(&ept->refcount, __ept_release);
+ } else
+ dev_warn_ratelimited(dev, "msg received with no recipient\n");
+
+ /* publish the real size of the buffer */
+ rpmsg_sg_init(&sg, msg, vrp->buf_size);
+
+ /* add the buffer back to the remote processor's virtqueue */
+ err = virtqueue_add_inbuf(vrp->rvq, &sg, 1, msg, GFP_KERNEL);
+ if (err < 0) {
+ dev_err(dev, "failed to add a virtqueue buffer: %d\n", err);
+ return err;
+ }
+
+ return 0;
+}
+
+/* called when an rx buffer is used, and it's time to digest a message */
+static void rpmsg_recv_done(struct virtqueue *rvq)
+{
+ struct virtproc_info *vrp = rvq->vdev->priv;
+ struct device *dev = &rvq->vdev->dev;
+ struct rpmsg_hdr *msg;
+ unsigned int len, msgs_received = 0;
+ int err;
+
+ msg = virtqueue_get_buf(rvq, &len);
+ if (!msg) {
+ dev_err(dev, "uhm, incoming signal, but no used buffer ?\n");
+ return;
+ }
+
+ while (msg) {
+ err = rpmsg_recv_single(vrp, dev, msg, len);
+ if (err)
+ break;
+
+ msgs_received++;
+
+ msg = virtqueue_get_buf(rvq, &len);
+ }
+
+ dev_dbg(dev, "Received %u messages\n", msgs_received);
+
+ /* tell the remote processor we added another available rx buffer */
+ if (msgs_received)
+ virtqueue_kick(vrp->rvq);
+}
+
+/*
+ * This is invoked whenever the remote processor completed processing
+ * a TX msg we just sent it, and the buffer is put back to the used ring.
+ *
+ * Normally, though, we suppress this "tx complete" interrupt in order to
+ * avoid the incurred overhead.
+ */
+static void rpmsg_xmit_done(struct virtqueue *svq)
+{
+ struct virtproc_info *vrp = svq->vdev->priv;
+
+ dev_dbg(&svq->vdev->dev, "%s\n", __func__);
+
+ /* wake up potential senders that are waiting for a tx buffer */
+ wake_up_interruptible(&vrp->sendq);
+}
+
+/*
+ * Called to expose to user a /dev/rpmsg_ctrlX interface allowing to
+ * create endpoint-to-endpoint communication without associated RPMsg channel.
+ * The endpoints are rattached to the ctrldev RPMsg device.
+ */
+static struct rpmsg_device *rpmsg_virtio_add_ctrl_dev(struct virtio_device *vdev)
+{
+ struct virtproc_info *vrp = vdev->priv;
+ struct virtio_rpmsg_channel *vch;
+ struct rpmsg_device *rpdev_ctrl;
+ int err = 0;
+
+ vch = kzalloc(sizeof(*vch), GFP_KERNEL);
+ if (!vch)
+ return ERR_PTR(-ENOMEM);
+
+ /* Link the channel to the vrp */
+ vch->vrp = vrp;
+
+ /* Assign public information to the rpmsg_device */
+ rpdev_ctrl = &vch->rpdev;
+ rpdev_ctrl->ops = &virtio_rpmsg_ops;
+
+ rpdev_ctrl->dev.parent = &vrp->vdev->dev;
+ rpdev_ctrl->dev.release = virtio_rpmsg_release_device;
+ rpdev_ctrl->little_endian = virtio_is_little_endian(vrp->vdev);
+
+ err = rpmsg_ctrldev_register_device(rpdev_ctrl);
+ if (err) {
+ /* vch will be free in virtio_rpmsg_release_device() */
+ return ERR_PTR(err);
+ }
+
+ return rpdev_ctrl;
+}
+
+static void rpmsg_virtio_del_ctrl_dev(struct rpmsg_device *rpdev_ctrl)
+{
+ if (!rpdev_ctrl)
+ return;
+ device_unregister(&rpdev_ctrl->dev);
+}
+
+static int rpmsg_probe(struct virtio_device *vdev)
+{
+ vq_callback_t *vq_cbs[] = { rpmsg_recv_done, rpmsg_xmit_done };
+ static const char * const names[] = { "input", "output" };
+ struct virtqueue *vqs[2];
+ struct virtproc_info *vrp;
+ struct virtio_rpmsg_channel *vch = NULL;
+ struct rpmsg_device *rpdev_ns, *rpdev_ctrl;
+ void *bufs_va;
+ int err = 0, i;
+ size_t total_buf_space;
+ bool notify;
+
+ vrp = kzalloc(sizeof(*vrp), GFP_KERNEL);
+ if (!vrp)
+ return -ENOMEM;
+
+ vrp->vdev = vdev;
+
+ idr_init(&vrp->endpoints);
+ mutex_init(&vrp->endpoints_lock);
+ mutex_init(&vrp->tx_lock);
+ init_waitqueue_head(&vrp->sendq);
+
+ /* We expect two virtqueues, rx and tx (and in this order) */
+ err = virtio_find_vqs(vdev, 2, vqs, vq_cbs, names, NULL);
+ if (err)
+ goto free_vrp;
+
+ vrp->rvq = vqs[0];
+ vrp->svq = vqs[1];
+
+ /* we expect symmetric tx/rx vrings */
+ WARN_ON(virtqueue_get_vring_size(vrp->rvq) !=
+ virtqueue_get_vring_size(vrp->svq));
+
+ /* we need less buffers if vrings are small */
+ if (virtqueue_get_vring_size(vrp->rvq) < MAX_RPMSG_NUM_BUFS / 2)
+ vrp->num_bufs = virtqueue_get_vring_size(vrp->rvq) * 2;
+ else
+ vrp->num_bufs = MAX_RPMSG_NUM_BUFS;
+
+ vrp->buf_size = MAX_RPMSG_BUF_SIZE;
+
+ total_buf_space = vrp->num_bufs * vrp->buf_size;
+
+ /* allocate coherent memory for the buffers */
+ bufs_va = dma_alloc_coherent(vdev->dev.parent,
+ total_buf_space, &vrp->bufs_dma,
+ GFP_KERNEL);
+ if (!bufs_va) {
+ err = -ENOMEM;
+ goto vqs_del;
+ }
+
+ dev_dbg(&vdev->dev, "buffers: va %pK, dma %pad\n",
+ bufs_va, &vrp->bufs_dma);
+
+ /* half of the buffers is dedicated for RX */
+ vrp->rbufs = bufs_va;
+
+ /* and half is dedicated for TX */
+ vrp->sbufs = bufs_va + total_buf_space / 2;
+
+ /* set up the receive buffers */
+ for (i = 0; i < vrp->num_bufs / 2; i++) {
+ struct scatterlist sg;
+ void *cpu_addr = vrp->rbufs + i * vrp->buf_size;
+
+ rpmsg_sg_init(&sg, cpu_addr, vrp->buf_size);
+
+ err = virtqueue_add_inbuf(vrp->rvq, &sg, 1, cpu_addr,
+ GFP_KERNEL);
+ WARN_ON(err); /* sanity check; this can't really happen */
+ }
+
+ /* suppress "tx-complete" interrupts */
+ virtqueue_disable_cb(vrp->svq);
+
+ vdev->priv = vrp;
+
+ rpdev_ctrl = rpmsg_virtio_add_ctrl_dev(vdev);
+ if (IS_ERR(rpdev_ctrl)) {
+ err = PTR_ERR(rpdev_ctrl);
+ goto free_coherent;
+ }
+
+ /* if supported by the remote processor, enable the name service */
+ if (virtio_has_feature(vdev, VIRTIO_RPMSG_F_NS)) {
+ vch = kzalloc(sizeof(*vch), GFP_KERNEL);
+ if (!vch) {
+ err = -ENOMEM;
+ goto free_ctrldev;
+ }
+
+ /* Link the channel to our vrp */
+ vch->vrp = vrp;
+
+ /* Assign public information to the rpmsg_device */
+ rpdev_ns = &vch->rpdev;
+ rpdev_ns->ops = &virtio_rpmsg_ops;
+ rpdev_ns->little_endian = virtio_is_little_endian(vrp->vdev);
+
+ rpdev_ns->dev.parent = &vrp->vdev->dev;
+ rpdev_ns->dev.release = virtio_rpmsg_release_device;
+
+ err = rpmsg_ns_register_device(rpdev_ns);
+ if (err)
+ /* vch will be free in virtio_rpmsg_release_device() */
+ goto free_ctrldev;
+ }
+
+ /*
+ * Prepare to kick but don't notify yet - we can't do this before
+ * device is ready.
+ */
+ notify = virtqueue_kick_prepare(vrp->rvq);
+
+ /* From this point on, we can notify and get callbacks. */
+ virtio_device_ready(vdev);
+
+ /* tell the remote processor it can start sending messages */
+ /*
+ * this might be concurrent with callbacks, but we are only
+ * doing notify, not a full kick here, so that's ok.
+ */
+ if (notify)
+ virtqueue_notify(vrp->rvq);
+
+ dev_info(&vdev->dev, "rpmsg host is online\n");
+
+ return 0;
+
+free_ctrldev:
+ rpmsg_virtio_del_ctrl_dev(rpdev_ctrl);
+free_coherent:
+ dma_free_coherent(vdev->dev.parent, total_buf_space,
+ bufs_va, vrp->bufs_dma);
+vqs_del:
+ vdev->config->del_vqs(vrp->vdev);
+free_vrp:
+ kfree(vrp);
+ return err;
+}
+
+static int rpmsg_remove_device(struct device *dev, void *data)
+{
+ device_unregister(dev);
+
+ return 0;
+}
+
+static void rpmsg_remove(struct virtio_device *vdev)
+{
+ struct virtproc_info *vrp = vdev->priv;
+ size_t total_buf_space = vrp->num_bufs * vrp->buf_size;
+ int ret;
+
+ virtio_reset_device(vdev);
+
+ ret = device_for_each_child(&vdev->dev, NULL, rpmsg_remove_device);
+ if (ret)
+ dev_warn(&vdev->dev, "can't remove rpmsg device: %d\n", ret);
+
+ idr_destroy(&vrp->endpoints);
+
+ vdev->config->del_vqs(vrp->vdev);
+
+ dma_free_coherent(vdev->dev.parent, total_buf_space,
+ vrp->rbufs, vrp->bufs_dma);
+
+ kfree(vrp);
+}
+
+static struct virtio_device_id id_table[] = {
+ { VIRTIO_ID_RPMSG, VIRTIO_DEV_ANY_ID },
+ { 0 },
+};
+
+static unsigned int features[] = {
+ VIRTIO_RPMSG_F_NS,
+};
+
+static struct virtio_driver virtio_ipc_driver = {
+ .feature_table = features,
+ .feature_table_size = ARRAY_SIZE(features),
+ .driver.name = KBUILD_MODNAME,
+ .driver.owner = THIS_MODULE,
+ .id_table = id_table,
+ .probe = rpmsg_probe,
+ .remove = rpmsg_remove,
+};
+
+static int __init rpmsg_init(void)
+{
+ int ret;
+
+ ret = register_virtio_driver(&virtio_ipc_driver);
+ if (ret)
+ pr_err("failed to register virtio driver: %d\n", ret);
+
+ return ret;
+}
+subsys_initcall(rpmsg_init);
+
+static void __exit rpmsg_fini(void)
+{
+ unregister_virtio_driver(&virtio_ipc_driver);
+}
+module_exit(rpmsg_fini);
+
+MODULE_DEVICE_TABLE(virtio, id_table);
+MODULE_DESCRIPTION("Virtio-based remote processor messaging bus");
+MODULE_LICENSE("GPL v2");