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Release 4.14 drivers/rpmsg/virtio_rpmsg_bus.c

Directory: drivers/rpmsg
/*
 * 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>
 *
 * This software is licensed under the terms of the GNU General Public
 * License version 2, as published by the Free Software Foundation, and
 * may be copied, distributed, and modified under those terms.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */


#define pr_fmt(fmt) "%s: " fmt, __func__

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/virtio.h>
#include <linux/virtio_ids.h>
#include <linux/virtio_config.h>
#include <linux/scatterlist.h>
#include <linux/dma-mapping.h>
#include <linux/slab.h>
#include <linux/idr.h>
#include <linux/jiffies.h>
#include <linux/sched.h>
#include <linux/wait.h>
#include <linux/rpmsg.h>
#include <linux/mutex.h>
#include <linux/of_device.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
 * @ns_ept:     the bus's name service endpoint
 *
 * 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;
	
struct rpmsg_endpoint *ns_ept;
};

/* 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 {
	
u32 src;
	
u32 dst;
	
u32 reserved;
	
u16 len;
	
u16 flags;
	
u8 data[0];

} __packed;

/**
 * struct rpmsg_ns_msg - dynamic name service announcement message
 * @name: name of remote service that is published
 * @addr: address of remote service that is published
 * @flags: indicates whether service is created or destroyed
 *
 * This message is sent across to publish a new service, or announce
 * about its removal. When we receive these messages, an appropriate
 * rpmsg channel (i.e device) is created/destroyed. In turn, the ->probe()
 * or ->remove() handler of the appropriate rpmsg driver will be invoked
 * (if/as-soon-as one is registered).
 */

struct rpmsg_ns_msg {
	
char name[RPMSG_NAME_SIZE];
	
u32 addr;
	
u32 flags;

} __packed;

/**
 * enum rpmsg_ns_flags - dynamic name service announcement flags
 *
 * @RPMSG_NS_CREATE: a new remote service was just created
 * @RPMSG_NS_DESTROY: a known remote service was just destroyed
 */

enum rpmsg_ns_flags {
	
RPMSG_NS_CREATE		= 0,
	
RPMSG_NS_DESTROY	= 1,
};

/**
 * @vrp: the remote processor this channel belongs to
 */

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)

/* Address 53 is reserved for advertising remote services */

#define RPMSG_NS_ADDR			(53)

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 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,
};

/**
 * 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); } }

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/** * __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); }

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/* 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; }

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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); }

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/** * __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); }

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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); }

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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 = rpdev->ept->addr; nsm.flags = 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; }

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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 = rpdev->ept->addr; nsm.flags = 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; }

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static const struct rpmsg_device_ops virtio_rpmsg_ops = { .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(vch); }

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/* * 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; /* * 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; }

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/* 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; }

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/** * 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); }

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/** * 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); }

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/** * 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). * * Returns 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 = len; msg->flags = 0; msg->src = src; msg->dst = 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", msg->src, msg->dst, msg->len, msg->flags, msg->reserved); #if defined(CONFIG_DYNAMIC_DEBUG) dynamic_hex_dump("rpmsg_virtio TX: ", DUMP_PREFIX_NONE, 16, 1, msg, sizeof(*msg) + 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; }

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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); }

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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); }

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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); }

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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); }

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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); }

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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); }

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Björn Andersson49100.00%1100.00%
Total49100.00%1100.00%


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; int err; dev_dbg(dev, "From: 0x%x, To: 0x%x, Len: %d, Flags: %d, Reserved: %d\n", msg->src, msg->dst, msg->len, msg->flags, 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, 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, msg->src); mutex_unlock(&ept->cb_lock); /* farewell, ept, we don't need you anymore */ kref_put(&ept->refcount, __ept_release); } else dev_warn(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; }

Contributors

PersonTokensPropCommitsCommitProp
Ohad Ben-Cohen26886.17%545.45%
Robert Tivy258.04%19.09%
Suman Anna92.89%19.09%
Loic Pallardy72.25%218.18%
Rusty Russell10.32%19.09%
Masanari Iida10.32%19.09%
Total311100.00%11100.00%

/* 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); }

Contributors

PersonTokensPropCommitsCommitProp
Robert Tivy12291.73%150.00%
Ohad Ben-Cohen118.27%150.00%
Total133100.00%2100.00%

/* * 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); }

Contributors

PersonTokensPropCommitsCommitProp
Ohad Ben-Cohen45100.00%1100.00%
Total45100.00%1100.00%

/* invoked when a name service announcement arrives */
static int rpmsg_ns_cb(struct rpmsg_device *rpdev, void *data, int len, void *priv, u32 src) { struct rpmsg_ns_msg *msg = data; struct rpmsg_device *newch; struct rpmsg_channel_info chinfo; struct virtproc_info *vrp