diff options
Diffstat (limited to 'drivers/rpmsg')
| -rw-r--r-- | drivers/rpmsg/Kconfig | 6 | ||||
| -rw-r--r-- | drivers/rpmsg/Makefile | 1 | ||||
| -rw-r--r-- | drivers/rpmsg/qcom_glink_native.c | 1017 | ||||
| -rw-r--r-- | drivers/rpmsg/qcom_glink_native.h | 38 | ||||
| -rw-r--r-- | drivers/rpmsg/qcom_glink_rpm.c | 995 |
5 files changed, 1064 insertions, 993 deletions
diff --git a/drivers/rpmsg/Kconfig b/drivers/rpmsg/Kconfig index 1323a245763b..4218570279e0 100644 --- a/drivers/rpmsg/Kconfig +++ b/drivers/rpmsg/Kconfig @@ -13,9 +13,13 @@ config RPMSG_CHAR in /dev. They make it possible for user-space programs to send and receive rpmsg packets. +config RPMSG_QCOM_GLINK_NATIVE + tristate + select RPMSG + config RPMSG_QCOM_GLINK_RPM tristate "Qualcomm RPM Glink driver" - select RPMSG + select RPMSG_QCOM_GLINK_NATIVE depends on HAS_IOMEM depends on MAILBOX help diff --git a/drivers/rpmsg/Makefile b/drivers/rpmsg/Makefile index 28cc19088cc0..09a756c33e71 100644 --- a/drivers/rpmsg/Makefile +++ b/drivers/rpmsg/Makefile @@ -1,5 +1,6 @@ obj-$(CONFIG_RPMSG) += rpmsg_core.o obj-$(CONFIG_RPMSG_CHAR) += rpmsg_char.o obj-$(CONFIG_RPMSG_QCOM_GLINK_RPM) += qcom_glink_rpm.o +obj-$(CONFIG_RPMSG_QCOM_GLINK_NATIVE) += qcom_glink_native.o obj-$(CONFIG_RPMSG_QCOM_SMD) += qcom_smd.o obj-$(CONFIG_RPMSG_VIRTIO) += virtio_rpmsg_bus.o diff --git a/drivers/rpmsg/qcom_glink_native.c b/drivers/rpmsg/qcom_glink_native.c new file mode 100644 index 000000000000..ffdf88e436a7 --- /dev/null +++ b/drivers/rpmsg/qcom_glink_native.c @@ -0,0 +1,1017 @@ +/* + * Copyright (c) 2016-2017, Linaro Ltd + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 and + * only version 2 as published by the Free Software Foundation. + * + * 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. + */ + +#include <linux/idr.h> +#include <linux/interrupt.h> +#include <linux/io.h> +#include <linux/list.h> +#include <linux/mfd/syscon.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/of_address.h> +#include <linux/of_irq.h> +#include <linux/platform_device.h> +#include <linux/regmap.h> +#include <linux/rpmsg.h> +#include <linux/slab.h> +#include <linux/workqueue.h> +#include <linux/mailbox_client.h> + +#include "rpmsg_internal.h" +#include "qcom_glink_native.h" + +#define GLINK_NAME_SIZE 32 + +#define RPM_GLINK_CID_MIN 1 +#define RPM_GLINK_CID_MAX 65536 + +struct glink_msg { + __le16 cmd; + __le16 param1; + __le32 param2; + u8 data[]; +} __packed; + +/** + * struct glink_defer_cmd - deferred incoming control message + * @node: list node + * @msg: message header + * data: payload of the message + * + * Copy of a received control message, to be added to @rx_queue and processed + * by @rx_work of @qcom_glink. + */ +struct glink_defer_cmd { + struct list_head node; + + struct glink_msg msg; + u8 data[]; +}; + +/** + * struct qcom_glink - driver context, relates to one remote subsystem + * @dev: reference to the associated struct device + * @mbox_client: mailbox client + * @mbox_chan: mailbox channel + * @rx_pipe: pipe object for receive FIFO + * @tx_pipe: pipe object for transmit FIFO + * @irq: IRQ for signaling incoming events + * @rx_work: worker for handling received control messages + * @rx_lock: protects the @rx_queue + * @rx_queue: queue of received control messages to be processed in @rx_work + * @tx_lock: synchronizes operations on the tx fifo + * @idr_lock: synchronizes @lcids and @rcids modifications + * @lcids: idr of all channels with a known local channel id + * @rcids: idr of all channels with a known remote channel id + */ +struct qcom_glink { + struct device *dev; + + struct mbox_client mbox_client; + struct mbox_chan *mbox_chan; + + struct qcom_glink_pipe *rx_pipe; + struct qcom_glink_pipe *tx_pipe; + + int irq; + + struct work_struct rx_work; + spinlock_t rx_lock; + struct list_head rx_queue; + + struct mutex tx_lock; + + struct mutex idr_lock; + struct idr lcids; + struct idr rcids; +}; + +enum { + GLINK_STATE_CLOSED, + GLINK_STATE_OPENING, + GLINK_STATE_OPEN, + GLINK_STATE_CLOSING, +}; + +/** + * struct glink_channel - internal representation of a channel + * @rpdev: rpdev reference, only used for primary endpoints + * @ept: rpmsg endpoint this channel is associated with + * @glink: qcom_glink context handle + * @refcount: refcount for the channel object + * @recv_lock: guard for @ept.cb + * @name: unique channel name/identifier + * @lcid: channel id, in local space + * @rcid: channel id, in remote space + * @buf: receive buffer, for gathering fragments + * @buf_offset: write offset in @buf + * @buf_size: size of current @buf + * @open_ack: completed once remote has acked the open-request + * @open_req: completed once open-request has been received + */ +struct glink_channel { + struct rpmsg_endpoint ept; + + struct rpmsg_device *rpdev; + struct qcom_glink *glink; + + struct kref refcount; + + spinlock_t recv_lock; + + char *name; + unsigned int lcid; + unsigned int rcid; + + void *buf; + int buf_offset; + int buf_size; + + struct completion open_ack; + struct completion open_req; +}; + +#define to_glink_channel(_ept) container_of(_ept, struct glink_channel, ept) + +static const struct rpmsg_endpoint_ops glink_endpoint_ops; + +#define RPM_CMD_VERSION 0 +#define RPM_CMD_VERSION_ACK 1 +#define RPM_CMD_OPEN 2 +#define RPM_CMD_CLOSE 3 +#define RPM_CMD_OPEN_ACK 4 +#define RPM_CMD_TX_DATA 9 +#define RPM_CMD_CLOSE_ACK 11 +#define RPM_CMD_TX_DATA_CONT 12 +#define RPM_CMD_READ_NOTIF 13 + +#define GLINK_FEATURE_INTENTLESS BIT(1) + +static struct glink_channel *qcom_glink_alloc_channel(struct qcom_glink *glink, + const char *name) +{ + struct glink_channel *channel; + + channel = kzalloc(sizeof(*channel), GFP_KERNEL); + if (!channel) + return ERR_PTR(-ENOMEM); + + /* Setup glink internal glink_channel data */ + spin_lock_init(&channel->recv_lock); + channel->glink = glink; + channel->name = kstrdup(name, GFP_KERNEL); + + init_completion(&channel->open_req); + init_completion(&channel->open_ack); + + kref_init(&channel->refcount); + + return channel; +} + +static void qcom_glink_channel_release(struct kref *ref) +{ + struct glink_channel *channel = container_of(ref, struct glink_channel, + refcount); + + kfree(channel->name); + kfree(channel); +} + +static size_t qcom_glink_rx_avail(struct qcom_glink *glink) +{ + return glink->rx_pipe->avail(glink->rx_pipe); +} + +static void qcom_glink_rx_peak(struct qcom_glink *glink, + void *data, size_t count) +{ + glink->rx_pipe->peak(glink->rx_pipe, data, count); +} + +static void qcom_glink_rx_advance(struct qcom_glink *glink, size_t count) +{ + glink->rx_pipe->advance(glink->rx_pipe, count); +} + +static size_t qcom_glink_tx_avail(struct qcom_glink *glink) +{ + return glink->tx_pipe->avail(glink->tx_pipe); +} + +static void qcom_glink_tx_write(struct qcom_glink *glink, + const void *hdr, size_t hlen, + const void *data, size_t dlen) +{ + glink->tx_pipe->write(glink->tx_pipe, hdr, hlen, data, dlen); +} + +static int qcom_glink_tx(struct qcom_glink *glink, + const void *hdr, size_t hlen, + const void *data, size_t dlen, bool wait) +{ + unsigned int tlen = hlen + dlen; + int ret; + + /* Reject packets that are too big */ + if (tlen >= glink->tx_pipe->length) + return -EINVAL; + + if (WARN(tlen % 8, "Unaligned TX request")) + return -EINVAL; + + ret = mutex_lock_interruptible(&glink->tx_lock); + if (ret) + return ret; + + while (qcom_glink_tx_avail(glink) < tlen) { + if (!wait) { + ret = -ENOMEM; + goto out; + } + + usleep_range(10000, 15000); + } + + qcom_glink_tx_write(glink, hdr, hlen, data, dlen); + + mbox_send_message(glink->mbox_chan, NULL); + mbox_client_txdone(glink->mbox_chan, 0); + +out: + mutex_unlock(&glink->tx_lock); + + return ret; +} + +static int qcom_glink_send_version(struct qcom_glink *glink) +{ + struct glink_msg msg; + + msg.cmd = cpu_to_le16(RPM_CMD_VERSION); + msg.param1 = cpu_to_le16(1); + msg.param2 = cpu_to_le32(GLINK_FEATURE_INTENTLESS); + + return qcom_glink_tx(glink, &msg, sizeof(msg), NULL, 0, true); +} + +static void qcom_glink_send_version_ack(struct qcom_glink *glink) +{ + struct glink_msg msg; + + msg.cmd = cpu_to_le16(RPM_CMD_VERSION_ACK); + msg.param1 = cpu_to_le16(1); + msg.param2 = cpu_to_le32(0); + + qcom_glink_tx(glink, &msg, sizeof(msg), NULL, 0, true); +} + +static void qcom_glink_send_open_ack(struct qcom_glink *glink, + struct glink_channel *channel) +{ + struct glink_msg msg; + + msg.cmd = cpu_to_le16(RPM_CMD_OPEN_ACK); + msg.param1 = cpu_to_le16(channel->rcid); + msg.param2 = cpu_to_le32(0); + + qcom_glink_tx(glink, &msg, sizeof(msg), NULL, 0, true); +} + +/** + * qcom_glink_send_open_req() - send a RPM_CMD_OPEN request to the remote + * @glink: Ptr to the glink edge + * @channel: Ptr to the channel that the open req is sent + * + * Allocates a local channel id and sends a RPM_CMD_OPEN message to the remote. + * Will return with refcount held, regardless of outcome. + * + * Returns 0 on success, negative errno otherwise. + */ +static int qcom_glink_send_open_req(struct qcom_glink *glink, + struct glink_channel *channel) +{ + struct { + struct glink_msg msg; + u8 name[GLINK_NAME_SIZE]; + } __packed req; + int name_len = strlen(channel->name) + 1; + int req_len = ALIGN(sizeof(req.msg) + name_len, 8); + int ret; + + kref_get(&channel->refcount); + + mutex_lock(&glink->idr_lock); + ret = idr_alloc_cyclic(&glink->lcids, channel, + RPM_GLINK_CID_MIN, RPM_GLINK_CID_MAX, + GFP_KERNEL); + mutex_unlock(&glink->idr_lock); + if (ret < 0) + return ret; + + channel->lcid = ret; + + req.msg.cmd = cpu_to_le16(RPM_CMD_OPEN); + req.msg.param1 = cpu_to_le16(channel->lcid); + req.msg.param2 = cpu_to_le32(name_len); + strcpy(req.name, channel->name); + + ret = qcom_glink_tx(glink, &req, req_len, NULL, 0, true); + if (ret) + goto remove_idr; + + return 0; + +remove_idr: + mutex_lock(&glink->idr_lock); + idr_remove(&glink->lcids, channel->lcid); + channel->lcid = 0; + mutex_unlock(&glink->idr_lock); + + return ret; +} + +static void qcom_glink_send_close_req(struct qcom_glink *glink, + struct glink_channel *channel) +{ + struct glink_msg req; + + req.cmd = cpu_to_le16(RPM_CMD_CLOSE); + req.param1 = cpu_to_le16(channel->lcid); + req.param2 = 0; + + qcom_glink_tx(glink, &req, sizeof(req), NULL, 0, true); +} + +static void qcom_glink_send_close_ack(struct qcom_glink *glink, + unsigned int rcid) +{ + struct glink_msg req; + + req.cmd = cpu_to_le16(RPM_CMD_CLOSE_ACK); + req.param1 = cpu_to_le16(rcid); + req.param2 = 0; + + qcom_glink_tx(glink, &req, sizeof(req), NULL, 0, true); +} + +static int qcom_glink_rx_defer(struct qcom_glink *glink, size_t extra) +{ + struct glink_defer_cmd *dcmd; + + extra = ALIGN(extra, 8); + + if (qcom_glink_rx_avail(glink) < sizeof(struct glink_msg) + extra) { + dev_dbg(glink->dev, "Insufficient data in rx fifo"); + return -ENXIO; + } + + dcmd = kzalloc(sizeof(*dcmd) + extra, GFP_ATOMIC); + if (!dcmd) + return -ENOMEM; + + INIT_LIST_HEAD(&dcmd->node); + + qcom_glink_rx_peak(glink, &dcmd->msg, sizeof(dcmd->msg) + extra); + + spin_lock(&glink->rx_lock); + list_add_tail(&dcmd->node, &glink->rx_queue); + spin_unlock(&glink->rx_lock); + + schedule_work(&glink->rx_work); + qcom_glink_rx_advance(glink, sizeof(dcmd->msg) + extra); + + return 0; +} + +static int qcom_glink_rx_data(struct qcom_glink *glink, size_t avail) +{ + struct glink_channel *channel; + struct { + struct glink_msg msg; + __le32 chunk_size; + __le32 left_size; + } __packed hdr; + unsigned int chunk_size; + unsigned int left_size; + unsigned int rcid; + + if (avail < sizeof(hdr)) { + dev_dbg(glink->dev, "Not enough data in fifo\n"); + return -EAGAIN; + } + + qcom_glink_rx_peak(glink, &hdr, sizeof(hdr)); + chunk_size = le32_to_cpu(hdr.chunk_size); + left_size = le32_to_cpu(hdr.left_size); + + if (avail < sizeof(hdr) + chunk_size) { + dev_dbg(glink->dev, "Payload not yet in fifo\n"); + return -EAGAIN; + } + + if (WARN(chunk_size % 4, "Incoming data must be word aligned\n")) + return -EINVAL; + + rcid = le16_to_cpu(hdr.msg.param1); + channel = idr_find(&glink->rcids, rcid); + if (!channel) { + dev_dbg(glink->dev, "Data on non-existing channel\n"); + + /* Drop the message */ + qcom_glink_rx_advance(glink, + ALIGN(sizeof(hdr) + chunk_size, 8)); + return 0; + } + + /* Might have an ongoing, fragmented, message to append */ + if (!channel->buf) { + channel->buf = kmalloc(chunk_size + left_size, GFP_ATOMIC); + if (!channel->buf) + return -ENOMEM; + + channel->buf_size = chunk_size + left_size; + channel->buf_offset = 0; + } + + qcom_glink_rx_advance(glink, sizeof(hdr)); + + if (channel->buf_size - channel->buf_offset < chunk_size) { + dev_err(glink->dev, "Insufficient space in input buffer\n"); + + /* The packet header lied, drop payload */ + qcom_glink_rx_advance(glink, chunk_size); + return -ENOMEM; + } + + qcom_glink_rx_peak(glink, channel->buf + channel->buf_offset, + chunk_size); + channel->buf_offset += chunk_size; + + /* Handle message when no fragments remain to be received */ + if (!left_size) { + spin_lock(&channel->recv_lock); + if (channel->ept.cb) { + channel->ept.cb(channel->ept.rpdev, + channel->buf, + channel->buf_offset, + channel->ept.priv, + RPMSG_ADDR_ANY); + } + spin_unlock(&channel->recv_lock); + + kfree(channel->buf); + channel->buf = NULL; + channel->buf_size = 0; + } + + /* Each message starts at 8 byte aligned address */ + qcom_glink_rx_advance(glink, ALIGN(chunk_size, 8)); + + return 0; +} + +static int qcom_glink_rx_open_ack(struct qcom_glink *glink, unsigned int lcid) +{ + struct glink_channel *channel; + + channel = idr_find(&glink->lcids, lcid); + if (!channel) { + dev_err(glink->dev, "Invalid open ack packet\n"); + return -EINVAL; + } + + complete(&channel->open_ack); + + return 0; +} + +static irqreturn_t qcom_glink_native_intr(int irq, void *data) +{ + struct qcom_glink *glink = data; + struct glink_msg msg; + unsigned int param1; + unsigned int param2; + unsigned int avail; + unsigned int cmd; + int ret; + + for (;;) { + avail = qcom_glink_rx_avail(glink); + if (avail < sizeof(msg)) + break; + + qcom_glink_rx_peak(glink, &msg, sizeof(msg)); + + cmd = le16_to_cpu(msg.cmd); + param1 = le16_to_cpu(msg.param1); + param2 = le32_to_cpu(msg.param2); + + switch (cmd) { + case RPM_CMD_VERSION: + case RPM_CMD_VERSION_ACK: + case RPM_CMD_CLOSE: + case RPM_CMD_CLOSE_ACK: + ret = qcom_glink_rx_defer(glink, 0); + break; + case RPM_CMD_OPEN_ACK: + ret = qcom_glink_rx_open_ack(glink, param1); + qcom_glink_rx_advance(glink, ALIGN(sizeof(msg), 8)); + break; + case RPM_CMD_OPEN: + ret = qcom_glink_rx_defer(glink, param2); + break; + case RPM_CMD_TX_DATA: + case RPM_CMD_TX_DATA_CONT: + ret = qcom_glink_rx_data(glink, avail); + break; + case RPM_CMD_READ_NOTIF: + qcom_glink_rx_advance(glink, ALIGN(sizeof(msg), 8)); + + mbox_send_message(glink->mbox_chan, NULL); + mbox_client_txdone(glink->mbox_chan, 0); + + ret = 0; + break; + default: + dev_err(glink->dev, "unhandled rx cmd: %d\n", cmd); + ret = -EINVAL; + break; + } + + if (ret) + break; + } + + return IRQ_HANDLED; +} + +/* Locally initiated rpmsg_create_ept */ +static struct glink_channel *qcom_glink_create_local(struct qcom_glink *glink, + const char *name) +{ + struct glink_channel *channel; + int ret; + + channel = qcom_glink_alloc_channel(glink, name); + if (IS_ERR(channel)) + return ERR_CAST(channel); + + ret = qcom_glink_send_open_req(glink, channel); + if (ret) + goto release_channel; + + ret = wait_for_completion_timeout(&channel->open_ack, 5 * HZ); + if (!ret) + goto err_timeout; + + ret = wait_for_completion_timeout(&channel->open_req, 5 * HZ); + if (!ret) + goto err_timeout; + + qcom_glink_send_open_ack(glink, channel); + + return channel; + +err_timeout: + /* qcom_glink_send_open_req() did register the channel in lcids*/ + mutex_lock(&glink->idr_lock); + idr_remove(&glink->lcids, channel->lcid); + mutex_unlock(&glink->idr_lock); + +release_channel: + /* Release qcom_glink_send_open_req() reference */ + kref_put(&channel->refcount, qcom_glink_channel_release); + /* Release qcom_glink_alloc_channel() reference */ + kref_put(&channel->refcount, qcom_glink_channel_release); + + return ERR_PTR(-ETIMEDOUT); +} + +/* Remote initiated rpmsg_create_ept */ +static int qcom_glink_create_remote(struct qcom_glink *glink, + struct glink_channel *channel) +{ + int ret; + + qcom_glink_send_open_ack(glink, channel); + + ret = qcom_glink_send_open_req(glink, channel); + if (ret) + goto close_link; + + ret = wait_for_completion_timeout(&channel->open_ack, 5 * HZ); + if (!ret) { + ret = -ETIMEDOUT; + goto close_link; + } + + return 0; + +close_link: + /* + * Send a close request to "undo" our open-ack. The close-ack will + * release the last reference. + */ + qcom_glink_send_close_req(glink, channel); + + /* Release qcom_glink_send_open_req() reference */ + kref_put(&channel->refcount, qcom_glink_channel_release); + + return ret; +} + +static struct rpmsg_endpoint *qcom_glink_create_ept(struct rpmsg_device *rpdev, + rpmsg_rx_cb_t cb, + void *priv, + struct rpmsg_channel_info + chinfo) +{ + struct glink_channel *parent = to_glink_channel(rpdev->ept); + struct glink_channel *channel; + struct qcom_glink *glink = parent->glink; + struct rpmsg_endpoint *ept; + const char *name = chinfo.name; + int cid; + int ret; + + idr_for_each_entry(&glink->rcids, channel, cid) { + if (!strcmp(channel->name, name)) + break; + } + + if (!channel) { + channel = qcom_glink_create_local(glink, name); + if (IS_ERR(channel)) + return NULL; + } else { + ret = qcom_glink_create_remote(glink, channel); + if (ret) + return NULL; + } + + ept = &channel->ept; + ept->rpdev = rpdev; + ept->cb = cb; + ept->priv = priv; + ept->ops = &glink_endpoint_ops; + + return ept; +} + +static void qcom_glink_destroy_ept(struct rpmsg_endpoint *ept) +{ + struct glink_channel *channel = to_glink_channel(ept); + struct qcom_glink *glink = channel->glink; + unsigned long flags; + + spin_lock_irqsave(&channel->recv_lock, flags); + channel->ept.cb = NULL; + spin_unlock_irqrestore(&channel->recv_lock, flags); + + /* Decouple the potential rpdev from the channel */ + channel->rpdev = NULL; + + qcom_glink_send_close_req(glink, channel); +} + +static int __qcom_glink_send(struct glink_channel *channel, + void *data, int len, bool wait) +{ + struct qcom_glink *glink = channel->glink; + struct { + struct glink_msg msg; + __le32 chunk_size; + __le32 left_size; + } __packed req; + + if (WARN(len % 8, "RPM GLINK expects 8 byte aligned messages\n")) + return -EINVAL; + + req.msg.cmd = cpu_to_le16(RPM_CMD_TX_DATA); + req.msg.param1 = cpu_to_le16(channel->lcid); + req.msg.param2 = cpu_to_le32(channel->rcid); + req.chunk_size = cpu_to_le32(len); + req.left_size = cpu_to_le32(0); + + return qcom_glink_tx(glink, &req, sizeof(req), data, len, wait); +} + +static int qcom_glink_send(struct rpmsg_endpoint *ept, void *data, int len) +{ + struct glink_channel *channel = to_glink_channel(ept); + + return __qcom_glink_send(channel, data, len, true); +} + +static int qcom_glink_trysend(struct rpmsg_endpoint *ept, void *data, int len) +{ + struct glink_channel *channel = to_glink_channel(ept); + + return __qcom_glink_send(channel, data, len, false); +} + +/* + * Finds the device_node for the glink child interested in this channel. + */ +static struct device_node *qcom_glink_match_channel(struct device_node *node, + const char *channel) +{ + struct device_node *child; + const char *name; + const char *key; + int ret; + + for_each_available_child_of_node(node, child) { + key = "qcom,glink-channels"; + ret = of_property_read_string(child, key, &name); + if (ret) + continue; + + if (strcmp(name, channel) == 0) + return child; + } + + return NULL; +} + +static const struct rpmsg_device_ops glink_device_ops = { + .create_ept = qcom_glink_create_ept, +}; + +static const struct rpmsg_endpoint_ops glink_endpoint_ops = { + .destroy_ept = qcom_glink_destroy_ept, + .send = qcom_glink_send, + .trysend = qcom_glink_trysend, +}; + +static void qcom_glink_rpdev_release(struct device *dev) +{ + struct rpmsg_device *rpdev = to_rpmsg_device(dev); + struct glink_channel *channel = to_glink_channel(rpdev->ept); + + channel->rpdev = NULL; + kfree(rpdev); +} + +static int qcom_glink_rx_open(struct qcom_glink *glink, unsigned int rcid, + char *name) +{ + struct glink_channel *channel; + struct rpmsg_device *rpdev; + bool create_device = false; + struct device_node *node; + int lcid; + int ret; + + idr_for_each_entry(&glink->lcids, channel, lcid) { + if (!strcmp(channel->name, name)) + break; + } + + if (!channel) { + channel = qcom_glink_alloc_channel(glink, name); + if (IS_ERR(channel)) + return PTR_ERR(channel); + + /* The opening dance was initiated by the remote */ + create_device = true; + } + + mutex_lock(&glink->idr_lock); + ret = idr_alloc(&glink->rcids, channel, rcid, rcid + 1, GFP_KERNEL); + if (ret < 0) { + dev_err(glink->dev, "Unable to insert channel into rcid list\n"); + mutex_unlock(&glink->idr_lock); + goto free_channel; + } + channel->rcid = ret; + mutex_unlock(&glink->idr_lock); + + complete(&channel->open_req); + + if (create_device) { + rpdev = kzalloc(sizeof(*rpdev), GFP_KERNEL); + if (!rpdev) { + ret = -ENOMEM; + goto rcid_remove; + } + + rpdev->ept = &channel->ept; + strncpy(rpdev->id.name, name, RPMSG_NAME_SIZE); + rpdev->src = RPMSG_ADDR_ANY; + rpdev->dst = RPMSG_ADDR_ANY; + rpdev->ops = &glink_device_ops; + + node = qcom_glink_match_channel(glink->dev->of_node, name); + rpdev->dev.of_node = node; + rpdev->dev.parent = glink->dev; + rpdev->dev.release = qcom_glink_rpdev_release; + + ret = rpmsg_register_device(rpdev); + if (ret) + goto free_rpdev; + + channel->rpdev = rpdev; + } + + return 0; + +free_rpdev: + kfree(rpdev); +rcid_remove: + mutex_lock(&glink->idr_lock); + idr_remove(&glink->rcids, channel->rcid); + channel->rcid = 0; + mutex_unlock(&glink->idr_lock); +free_channel: + /* Release the reference, iff we took it */ + if (create_device) + kref_put(&channel->refcount, qcom_glink_channel_release); + + return ret; +} + +static void qcom_glink_rx_close(struct qcom_glink *glink, unsigned int rcid) +{ + struct rpmsg_channel_info chinfo; + struct glink_channel *channel; + + channel = idr_find(&glink->rcids, rcid); + if (WARN(!channel, "close request on unknown channel\n")) + return; + + if (channel->rpdev) { + strncpy(chinfo.name, channel->name, sizeof(chinfo.name)); + chinfo.src = RPMSG_ADDR_ANY; + chinfo.dst = RPMSG_ADDR_ANY; + + rpmsg_unregister_device(glink->dev, &chinfo); + } + + qcom_glink_send_close_ack(glink, channel->rcid); + + mutex_lock(&glink->idr_lock); + idr_remove(&glink->rcids, channel->rcid); + channel->rcid = 0; + mutex_unlock(&glink->idr_lock); + + kref_put(&channel->refcount, qcom_glink_channel_release); +} + +static void qcom_glink_rx_close_ack(struct qcom_glink *glink, unsigned int lcid) +{ + struct glink_channel *channel; + + channel = idr_find(&glink->lcids, lcid); + if (WARN(!channel, "close ack on unknown channel\n")) + return; + + mutex_lock(&glink->idr_lock); + idr_remove(&glink->lcids, channel->lcid); + channel->lcid = 0; + mutex_unlock(&glink->idr_lock); + + kref_put(&channel->refcount, qcom_glink_channel_release); +} + +static void qcom_glink_work(struct work_struct *work) +{ + struct qcom_glink *glink = container_of(work, struct qcom_glink, + rx_work); + struct glink_defer_cmd *dcmd; + struct glink_msg *msg; + unsigned long flags; + unsigned int param1; + unsigned int param2; + unsigned int cmd; + + for (;;) { + spin_lock_irqsave(&glink->rx_lock, flags); + if (list_empty(&glink->rx_queue)) { + spin_unlock_irqrestore(&glink->rx_lock, flags); + break; + } + dcmd = list_first_entry(&glink->rx_queue, + struct glink_defer_cmd, node); + list_del(&dcmd->node); + spin_unlock_irqrestore(&glink->rx_lock, flags); + + msg = &dcmd->msg; + cmd = le16_to_cpu(msg->cmd); + param1 = le16_to_cpu(msg->param1); + param2 = le32_to_cpu(msg->param2); + + switch (cmd) { + case RPM_CMD_VERSION: + qcom_glink_send_version_ack(glink); + break; + case RPM_CMD_VERSION_ACK: + break; + case RPM_CMD_OPEN: + qcom_glink_rx_open(glink, param1, msg->data); + break; + case RPM_CMD_CLOSE: + qcom_glink_rx_close(glink, param1); + break; + case RPM_CMD_CLOSE_ACK: + qcom_glink_rx_close_ack(glink, param1); + break; + default: + WARN(1, "Unknown defer object %d\n", cmd); + break; + } + + kfree(dcmd); + } +} + +struct qcom_glink *qcom_glink_native_probe(struct device *dev, + struct qcom_glink_pipe *rx, + struct qcom_glink_pipe *tx) +{ + int irq; + int ret; + struct qcom_glink *glink; + + glink = devm_kzalloc(dev, sizeof(*glink), GFP_KERNEL); + if (!glink) + return ERR_PTR(-ENOMEM); + + glink->dev = dev; + glink->tx_pipe = tx; + glink->rx_pipe = rx; + + mutex_init(&glink->tx_lock); + spin_lock_init(&glink->rx_lock); + INIT_LIST_HEAD(&glink->rx_queue); + INIT_WORK(&glink->rx_work, qcom_glink_work); + + mutex_init(&glink->idr_lock); + idr_init(&glink->lcids); + idr_init(&glink->rcids); + + glink->mbox_client.dev = dev; + glink->mbox_chan = mbox_request_channel(&glink->mbox_client, 0); + if (IS_ERR(glink->mbox_chan)) { + if (PTR_ERR(glink->mbox_chan) != -EPROBE_DEFER) + dev_err(dev, "failed to acquire IPC channel\n"); + return ERR_CAST(glink->mbox_chan); + } + + irq = of_irq_get(dev->of_node, 0); + ret = devm_request_irq(dev, irq, + qcom_glink_native_intr, + IRQF_NO_SUSPEND | IRQF_SHARED, + "glink-native", glink); + if (ret) { + dev_err(dev, "failed to request IRQ\n"); + return ERR_PTR(ret); + } + + glink->irq = irq; + + ret = qcom_glink_send_version(glink); + if (ret) + return ERR_PTR(ret); + + return glink; +} + +static int qcom_glink_remove_device(struct device *dev, void *data) +{ + device_unregister(dev); + + return 0; +} + +void qcom_glink_native_remove(struct qcom_glink *glink) +{ + struct glink_channel *channel; + int cid; + int ret; + + disable_irq(glink->irq); + cancel_work_sync(&glink->rx_work); + + ret = device_for_each_child(glink->dev, NULL, qcom_glink_remove_device); + if (ret) + dev_warn(glink->dev, "Can't remove GLINK devices: %d\n", ret); + + /* Release any defunct local channels, waiting for close-ack */ + idr_for_each_entry(&glink->lcids, channel, cid) + kref_put(&channel->refcount, qcom_glink_channel_release); + + idr_destroy(&glink->lcids); + idr_destroy(&glink->rcids); +} diff --git a/drivers/rpmsg/qcom_glink_native.h b/drivers/rpmsg/qcom_glink_native.h new file mode 100644 index 000000000000..d5627a495c00 --- /dev/null +++ b/drivers/rpmsg/qcom_glink_native.h @@ -0,0 +1,38 @@ +/* + * Copyright (c) 2016-2017, Linaro Ltd + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 and + * only version 2 as published by the Free Software Foundation. + * + * 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. + */ + +#ifndef __QCOM_GLINK_NATIVE_H__ +#define __QCOM_GLINK_NATIVE_H__ + +struct qcom_glink_pipe { + size_t length; + + size_t (*avail)(struct qcom_glink_pipe *glink_pipe); + + void (*peak)(struct qcom_glink_pipe *glink_pipe, void *data, + size_t count); + void (*advance)(struct qcom_glink_pipe *glink_pipe, size_t count); + + void (*write)(struct qcom_glink_pipe *glink_pipe, + const void *hdr, size_t hlen, + const void *data, size_t dlen); +}; + +struct qcom_glink; + +struct qcom_glink *qcom_glink_native_probe(struct device *dev, + struct qcom_glink_pipe *rx, + struct qcom_glink_pipe *tx); +void qcom_glink_native_remove(struct qcom_glink *glink); + +#endif diff --git a/drivers/rpmsg/qcom_glink_rpm.c b/drivers/rpmsg/qcom_glink_rpm.c index 5f0fa0d2b0e0..33daa3223ce0 100644 --- a/drivers/rpmsg/qcom_glink_rpm.c +++ b/drivers/rpmsg/qcom_glink_rpm.c @@ -19,7 +19,6 @@ #include <linux/module.h> #include <linux/of.h> #include <linux/of_address.h> -#include <linux/of_irq.h> #include <linux/platform_device.h> #include <linux/regmap.h> #include <linux/rpmsg.h> @@ -28,6 +27,7 @@ #include <linux/mailbox_client.h> #include "rpmsg_internal.h" +#include "qcom_glink_native.h" #define RPM_TOC_SIZE 256 #define RPM_TOC_MAGIC 0x67727430 /* grt0 */ @@ -37,12 +37,7 @@ #define RPM_TX_FIFO_ID 0x61703272 /* ap2r */ #define RPM_RX_FIFO_ID 0x72326170 /* r2ap */ -#define GLINK_NAME_SIZE 32 - -#define RPM_GLINK_CID_MIN 1 -#define RPM_GLINK_CID_MAX 65536 - -#define to_rpm_pipe(p) container_of(p, struct glink_rpm_pipe, native) +#define to_rpm_pipe(p) container_of(p, struct glink_rpm_pipe, native) struct rpm_toc_entry { __le32 id; @@ -50,20 +45,6 @@ struct rpm_toc_entry { __le32 size; } __packed; -struct qcom_glink; - -struct qcom_glink_pipe { - size_t length; - - size_t (*avail)(struct qcom_glink_pipe *glink_pipe); - void (*peak)(struct qcom_glink_pipe *glink_pipe, void *data, - size_t count); - void (*advance)(struct qcom_glink_pipe *glink_pipe, size_t count); - void (*write)(struct qcom_glink_pipe *glink_pipe, - const void *hdr, size_t hlen, - const void *data, size_t dlen); -}; - struct rpm_toc { __le32 magic; __le32 count; @@ -71,13 +52,6 @@ struct rpm_toc { struct rpm_toc_entry entries[]; } __packed; -struct glink_msg { - __le16 cmd; - __le16 param1; - __le32 param2; - u8 data[]; -} __packed; - struct glink_rpm_pipe { struct qcom_glink_pipe native; @@ -87,151 +61,6 @@ struct glink_rpm_pipe { void __iomem *fifo; }; -/** - * struct glink_defer_cmd - deferred incoming control message - * @node: list node - * @msg: message header - * data: payload of the message - * - * Copy of a received control message, to be added to @rx_queue and processed - * by @rx_work of @glink_rpm. - */ -struct glink_defer_cmd { - struct list_head node; - - struct glink_msg msg; - u8 data[]; -}; - -/** - * struct glink_rpm - driver context, relates to one remote subsystem - * @dev: reference to the associated struct device - * @doorbell: "rpm_hlos" ipc doorbell - * @rx_pipe: pipe object for receive FIFO - * @tx_pipe: pipe object for transmit FIFO - * @irq: IRQ for signaling incoming events - * @rx_work: worker for handling received control messages - * @rx_lock: protects the @rx_queue - * @rx_queue: queue of received control messages to be processed in @rx_work - * @tx_lock: synchronizes operations on the tx fifo - * @idr_lock: synchronizes @lcids and @rcids modifications - * @lcids: idr of all channels with a known local channel id - * @rcids: idr of all channels with a known remote channel id - */ -struct qcom_glink { - struct device *dev; - - struct mbox_client mbox_client; - struct mbox_chan *mbox_chan; - - struct qcom_glink_pipe *rx_pipe; - struct qcom_glink_pipe *tx_pipe; - - int irq; - - struct work_struct rx_work; - spinlock_t rx_lock; - struct list_head rx_queue; - - struct mutex tx_lock; - - struct mutex idr_lock; - struct idr lcids; - struct idr rcids; -}; - -enum { - GLINK_STATE_CLOSED, - GLINK_STATE_OPENING, - GLINK_STATE_OPEN, - GLINK_STATE_CLOSING, -}; - -/** - * struct glink_channel - internal representation of a channel - * @rpdev: rpdev reference, only used for primary endpoints - * @ept: rpmsg endpoint this channel is associated with - * @glink: qcom_glink context handle - * @refcount: refcount for the channel object - * @recv_lock: guard for @ept.cb - * @name: unique channel name/identifier - * @lcid: channel id, in local space - * @rcid: channel id, in remote space - * @buf: receive buffer, for gathering fragments - * @buf_offset: write offset in @buf - * @buf_size: size of current @buf - * @open_ack: completed once remote has acked the open-request - * @open_req: completed once open-request has been received - */ -struct glink_channel { - struct rpmsg_endpoint ept; - - struct rpmsg_device *rpdev; - struct qcom_glink *glink; - - struct kref refcount; - - spinlock_t recv_lock; - - char *name; - unsigned int lcid; - unsigned int rcid; - - void *buf; - int buf_offset; - int buf_size; - - struct completion open_ack; - struct completion open_req; -}; - -#define to_glink_channel(_ept) container_of(_ept, struct glink_channel, ept) - -static const struct rpmsg_endpoint_ops glink_endpoint_ops; - -#define RPM_CMD_VERSION 0 -#define RPM_CMD_VERSION_ACK 1 -#define RPM_CMD_OPEN 2 -#define RPM_CMD_CLOSE 3 -#define RPM_CMD_OPEN_ACK 4 -#define RPM_CMD_TX_DATA 9 -#define RPM_CMD_CLOSE_ACK 11 -#define RPM_CMD_TX_DATA_CONT 12 -#define RPM_CMD_READ_NOTIF 13 - -#define GLINK_FEATURE_INTENTLESS BIT(1) - -static struct glink_channel *qcom_glink_alloc_channel(struct qcom_glink *glink, - const char *name) -{ - struct glink_channel *channel; - - channel = kzalloc(sizeof(*channel), GFP_KERNEL); - if (!channel) - return ERR_PTR(-ENOMEM); - - /* Setup glink internal glink_channel data */ - spin_lock_init(&channel->recv_lock); - channel->glink = glink; - channel->name = kstrdup(name, GFP_KERNEL); - - init_completion(&channel->open_req); - init_completion(&channel->open_ack); - - kref_init(&channel->refcount); - - return channel; -} - -static void qcom_glink_channel_release(struct kref *ref) -{ - struct glink_channel *channel = container_of(ref, struct glink_channel, - refcount); - - kfree(channel->name); - kfree(channel); -} - static size_t glink_rpm_rx_avail(struct qcom_glink_pipe *glink_pipe) { struct glink_rpm_pipe *pipe = to_rpm_pipe(glink_pipe); @@ -247,11 +76,6 @@ static size_t glink_rpm_rx_avail(struct qcom_glink_pipe *glink_pipe) return head - tail; } -static size_t qcom_glink_rx_avail(struct qcom_glink *glink) -{ - return glink->rx_pipe->avail(glink->rx_pipe); -} - static void glink_rpm_rx_peak(struct qcom_glink_pipe *glink_pipe, void *data, size_t count) { @@ -273,12 +97,6 @@ static void glink_rpm_rx_peak(struct qcom_glink_pipe *glink_pipe, } } -static void qcom_glink_rx_peak(struct qcom_glink *glink, - void *data, size_t count) -{ - glink->rx_pipe->peak(glink->rx_pipe, data, count); -} - static void glink_rpm_rx_advance(struct qcom_glink_pipe *glink_pipe, size_t count) { @@ -294,11 +112,6 @@ static void glink_rpm_rx_advance(struct qcom_glink_pipe *glink_pipe, writel(tail, pipe->tail); } -static void qcom_glink_rx_advance(struct qcom_glink *glink, size_t count) -{ - glink->rx_pipe->advance(glink->rx_pipe, count); -} - static size_t glink_rpm_tx_avail(struct qcom_glink_pipe *glink_pipe) { struct glink_rpm_pipe *pipe = to_rpm_pipe(glink_pipe); @@ -314,11 +127,6 @@ static size_t glink_rpm_tx_avail(struct qcom_glink_pipe *glink_pipe) return tail - head; } -static size_t qcom_glink_tx_avail(struct qcom_glink *glink) -{ - return glink->tx_pipe->avail(glink->tx_pipe); -} - static unsigned int glink_rpm_tx_write_one(struct glink_rpm_pipe *pipe, unsigned int head, const void *data, size_t count) @@ -356,731 +164,6 @@ static void glink_rpm_tx_write(struct qcom_glink_pipe *glink_pipe, writel(head, pipe->head); } -static void qcom_glink_tx_write(struct qcom_glink *glink, - const void *hdr, size_t hlen, - const void *data, size_t dlen) -{ - glink->tx_pipe->write(glink->tx_pipe, hdr, hlen, data, dlen); -} - -static int qcom_glink_tx(struct qcom_glink *glink, - const void *hdr, size_t hlen, - const void *data, size_t dlen, bool wait) -{ - unsigned int tlen = hlen + dlen; - int ret; - - /* Reject packets that are too big */ - if (tlen >= glink->tx_pipe->length) - return -EINVAL; - - if (WARN(tlen % 8, "Unaligned TX request")) - return -EINVAL; - - ret = mutex_lock_interruptible(&glink->tx_lock); - if (ret) - return ret; - - while (qcom_glink_tx_avail(glink) < tlen) { - if (!wait) { - ret = -ENOMEM; - goto out; - } - - msleep(10); - } - - qcom_glink_tx_write(glink, hdr, hlen, data, dlen); - - mbox_send_message(glink->mbox_chan, NULL); - mbox_client_txdone(glink->mbox_chan, 0); - -out: - mutex_unlock(&glink->tx_lock); - - return ret; -} - -static int qcom_glink_send_version(struct qcom_glink *glink) -{ - struct glink_msg msg; - - msg.cmd = cpu_to_le16(RPM_CMD_VERSION); - msg.param1 = cpu_to_le16(1); - msg.param2 = cpu_to_le32(GLINK_FEATURE_INTENTLESS); - - return qcom_glink_tx(glink, &msg, sizeof(msg), NULL, 0, true); -} - -static void qcom_glink_send_version_ack(struct qcom_glink *glink) -{ - struct glink_msg msg; - - msg.cmd = cpu_to_le16(RPM_CMD_VERSION_ACK); - msg.param1 = cpu_to_le16(1); - msg.param2 = cpu_to_le32(0); - - qcom_glink_tx(glink, &msg, sizeof(msg), NULL, 0, true); -} - -static void qcom_glink_send_open_ack(struct qcom_glink *glink, - struct glink_channel *channel) -{ - struct glink_msg msg; - - msg.cmd = cpu_to_le16(RPM_CMD_OPEN_ACK); - msg.param1 = cpu_to_le16(channel->rcid); - msg.param2 = cpu_to_le32(0); - - qcom_glink_tx(glink, &msg, sizeof(msg), NULL, 0, true); -} - -/** - * qcom_glink_send_open_req() - send a RPM_CMD_OPEN request to the remote - * @glink: - * @channel: - * - * Allocates a local channel id and sends a RPM_CMD_OPEN message to the remote. - * Will return with refcount held, regardless of outcome. - * - * Returns 0 on success, negative errno otherwise. - */ -static int qcom_glink_send_open_req(struct qcom_glink *glink, - struct glink_channel *channel) -{ - struct { - struct glink_msg msg; - u8 name[GLINK_NAME_SIZE]; - } __packed req; - int name_len = strlen(channel->name) + 1; - int req_len = ALIGN(sizeof(req.msg) + name_len, 8); - int ret; - - kref_get(&channel->refcount); - - mutex_lock(&glink->idr_lock); - ret = idr_alloc_cyclic(&glink->lcids, channel, - RPM_GLINK_CID_MIN, RPM_GLINK_CID_MAX, GFP_KERNEL); - mutex_unlock(&glink->idr_lock); - if (ret < 0) - return ret; - - channel->lcid = ret; - - req.msg.cmd = cpu_to_le16(RPM_CMD_OPEN); - req.msg.param1 = cpu_to_le16(channel->lcid); - req.msg.param2 = cpu_to_le32(name_len); - strcpy(req.name, channel->name); - - ret = qcom_glink_tx(glink, &req, req_len, NULL, 0, true); - if (ret) - goto remove_idr; - - return 0; - -remove_idr: - mutex_lock(&glink->idr_lock); - idr_remove(&glink->lcids, channel->lcid); - channel->lcid = 0; - mutex_unlock(&glink->idr_lock); - - return ret; -} - -static void qcom_glink_send_close_req(struct qcom_glink *glink, - struct glink_channel *channel) -{ - struct glink_msg req; - - req.cmd = cpu_to_le16(RPM_CMD_CLOSE); - req.param1 = cpu_to_le16(channel->lcid); - req.param2 = 0; - - qcom_glink_tx(glink, &req, sizeof(req), NULL, 0, true); -} - -static void qcom_glink_send_close_ack(struct qcom_glink *glink, - unsigned int rcid) -{ - struct glink_msg req; - - req.cmd = cpu_to_le16(RPM_CMD_CLOSE_ACK); - req.param1 = cpu_to_le16(rcid); - req.param2 = 0; - - qcom_glink_tx(glink, &req, sizeof(req), NULL, 0, true); -} - -static int qcom_glink_rx_defer(struct qcom_glink *glink, size_t extra) -{ - struct glink_defer_cmd *dcmd; - - extra = ALIGN(extra, 8); - - if (qcom_glink_rx_avail(glink) < sizeof(struct glink_msg) + extra) { - dev_dbg(glink->dev, "Insufficient data in rx fifo"); - return -ENXIO; - } - - dcmd = kzalloc(sizeof(*dcmd) + extra, GFP_ATOMIC); - if (!dcmd) - return -ENOMEM; - - INIT_LIST_HEAD(&dcmd->node); - - qcom_glink_rx_peak(glink, &dcmd->msg, sizeof(dcmd->msg) + extra); - - spin_lock(&glink->rx_lock); - list_add_tail(&dcmd->node, &glink->rx_queue); - spin_unlock(&glink->rx_lock); - - schedule_work(&glink->rx_work); - qcom_glink_rx_advance(glink, sizeof(dcmd->msg) + extra); - - return 0; -} - -static int qcom_glink_rx_data(struct qcom_glink *glink, size_t avail) -{ - struct glink_channel *channel; - struct { - struct glink_msg msg; - __le32 chunk_size; - __le32 left_size; - } __packed hdr; - unsigned int chunk_size; - unsigned int left_size; - unsigned int rcid; - - if (avail < sizeof(hdr)) { - dev_dbg(glink->dev, "Not enough data in fifo\n"); - return -EAGAIN; - } - - qcom_glink_rx_peak(glink, &hdr, sizeof(hdr)); - chunk_size = le32_to_cpu(hdr.chunk_size); - left_size = le32_to_cpu(hdr.left_size); - - if (avail < sizeof(hdr) + chunk_size) { - dev_dbg(glink->dev, "Payload not yet in fifo\n"); - return -EAGAIN; - } - - if (WARN(chunk_size % 4, "Incoming data must be word aligned\n")) - return -EINVAL; - - rcid = le16_to_cpu(hdr.msg.param1); - channel = idr_find(&glink->rcids, rcid); - if (!channel) { - dev_dbg(glink->dev, "Data on non-existing channel\n"); - - /* Drop the message */ - qcom_glink_rx_advance(glink, - ALIGN(sizeof(hdr) + chunk_size, 8)); - return 0; - } - - /* Might have an ongoing, fragmented, message to append */ - if (!channel->buf) { - channel->buf = kmalloc(chunk_size + left_size, GFP_ATOMIC); - if (!channel->buf) - return -ENOMEM; - - channel->buf_size = chunk_size + left_size; - channel->buf_offset = 0; - } - - qcom_glink_rx_advance(glink, sizeof(hdr)); - - if (channel->buf_size - channel->buf_offset < chunk_size) { - dev_err(glink->dev, "Insufficient space in input buffer\n"); - - /* The packet header lied, drop payload */ - qcom_glink_rx_advance(glink, chunk_size); - return -ENOMEM; - } - - qcom_glink_rx_peak(glink, channel->buf + channel->buf_offset, - chunk_size); - channel->buf_offset += chunk_size; - - /* Handle message when no fragments remain to be received */ - if (!left_size) { - spin_lock(&channel->recv_lock); - if (channel->ept.cb) { - channel->ept.cb(channel->ept.rpdev, - channel->buf, - channel->buf_offset, - channel->ept.priv, - RPMSG_ADDR_ANY); - } - spin_unlock(&channel->recv_lock); - - kfree(channel->buf); - channel->buf = NULL; - channel->buf_size = 0; - } - - /* Each message starts at 8 byte aligned address */ - qcom_glink_rx_advance(glink, ALIGN(chunk_size, 8)); - - return 0; -} - -static int qcom_glink_rx_open_ack(struct qcom_glink *glink, unsigned int lcid) -{ - struct glink_channel *channel; - - channel = idr_find(&glink->lcids, lcid); - if (!channel) { - dev_err(glink->dev, "Invalid open ack packet\n"); - return -EINVAL; - } - - complete(&channel->open_ack); - - return 0; -} - -static irqreturn_t qcom_glink_intr(int irq, void *data) -{ - struct qcom_glink *glink = data; - struct glink_msg msg; - unsigned int param1; - unsigned int param2; - unsigned int avail; - unsigned int cmd; - int ret; - - for (;;) { - avail = qcom_glink_rx_avail(glink); - if (avail < sizeof(msg)) - break; - - qcom_glink_rx_peak(glink, &msg, sizeof(msg)); - - cmd = le16_to_cpu(msg.cmd); - param1 = le16_to_cpu(msg.param1); - param2 = le32_to_cpu(msg.param2); - - switch (cmd) { - case RPM_CMD_VERSION: - case RPM_CMD_VERSION_ACK: - case RPM_CMD_CLOSE: - case RPM_CMD_CLOSE_ACK: - ret = qcom_glink_rx_defer(glink, 0); - break; - case RPM_CMD_OPEN_ACK: - ret = qcom_glink_rx_open_ack(glink, param1); - qcom_glink_rx_advance(glink, ALIGN(sizeof(msg), 8)); - break; - case RPM_CMD_OPEN: - ret = qcom_glink_rx_defer(glink, param2); - break; - case RPM_CMD_TX_DATA: - case RPM_CMD_TX_DATA_CONT: - ret = qcom_glink_rx_data(glink, avail); - break; - case RPM_CMD_READ_NOTIF: - qcom_glink_rx_advance(glink, ALIGN(sizeof(msg), 8)); - - mbox_send_message(glink->mbox_chan, NULL); - mbox_client_txdone(glink->mbox_chan, 0); - - ret = 0; - break; - default: - dev_err(glink->dev, "unhandled rx cmd: %d\n", cmd); - ret = -EINVAL; - break; - } - - if (ret) - break; - } - - return IRQ_HANDLED; -} - -/* Locally initiated rpmsg_create_ept */ -static struct glink_channel *qcom_glink_create_local(struct qcom_glink *glink, - const char *name) -{ - struct glink_channel *channel; - int ret; - - channel = qcom_glink_alloc_channel(glink, name); - if (IS_ERR(channel)) - return ERR_CAST(channel); - - ret = qcom_glink_send_open_req(glink, channel); - if (ret) - goto release_channel; - - ret = wait_for_completion_timeout(&channel->open_ack, 5 * HZ); - if (!ret) - goto err_timeout; - - ret = wait_for_completion_timeout(&channel->open_req, 5 * HZ); - if (!ret) - goto err_timeout; - - qcom_glink_send_open_ack(glink, channel); - - return channel; - -err_timeout: - /* qcom_glink_send_open_req() did register the channel in lcids*/ - mutex_lock(&glink->idr_lock); - idr_remove(&glink->lcids, channel->lcid); - mutex_unlock(&glink->idr_lock); - -release_channel: - /* Release qcom_glink_send_open_req() reference */ - kref_put(&channel->refcount, qcom_glink_channel_release); - /* Release qcom_glink_alloc_channel() reference */ - kref_put(&channel->refcount, qcom_glink_channel_release); - - return ERR_PTR(-ETIMEDOUT); -} - -/* Remote initiated rpmsg_create_ept */ -static int qcom_glink_create_remote(struct qcom_glink *glink, - struct glink_channel *channel) -{ - int ret; - - qcom_glink_send_open_ack(glink, channel); - - ret = qcom_glink_send_open_req(glink, channel); - if (ret) - goto close_link; - - ret = wait_for_completion_timeout(&channel->open_ack, 5 * HZ); - if (!ret) { - ret = -ETIMEDOUT; - goto close_link; - } - - return 0; - -close_link: - /* - * Send a close request to "undo" our open-ack. The close-ack will - * release the last reference. - */ - qcom_glink_send_close_req(glink, channel); - - /* Release qcom_glink_send_open_req() reference */ - kref_put(&channel->refcount, qcom_glink_channel_release); - - return ret; -} - -static struct rpmsg_endpoint *qcom_glink_create_ept(struct rpmsg_device *rpdev, - rpmsg_rx_cb_t cb, - void *priv, - struct rpmsg_channel_info - chinfo) -{ - struct glink_channel *parent = to_glink_channel(rpdev->ept); - struct glink_channel *channel; - struct qcom_glink *glink = parent->glink; - struct rpmsg_endpoint *ept; - const char *name = chinfo.name; - int cid; - int ret; - - idr_for_each_entry(&glink->rcids, channel, cid) { - if (!strcmp(channel->name, name)) - break; - } - - if (!channel) { - channel = qcom_glink_create_local(glink, name); - if (IS_ERR(channel)) - return NULL; - } else { - ret = qcom_glink_create_remote(glink, channel); - if (ret) - return NULL; - } - - ept = &channel->ept; - ept->rpdev = rpdev; - ept->cb = cb; - ept->priv = priv; - ept->ops = &glink_endpoint_ops; - - return ept; -} - -static void qcom_glink_destroy_ept(struct rpmsg_endpoint *ept) -{ - struct glink_channel *channel = to_glink_channel(ept); - struct qcom_glink *glink = channel->glink; - unsigned long flags; - - spin_lock_irqsave(&channel->recv_lock, flags); - channel->ept.cb = NULL; - spin_unlock_irqrestore(&channel->recv_lock, flags); - - /* Decouple the potential rpdev from the channel */ - channel->rpdev = NULL; - - qcom_glink_send_close_req(glink, channel); -} - -static int __qcom_glink_send(struct glink_channel *channel, - void *data, int len, bool wait) -{ - struct qcom_glink *glink = channel->glink; - struct { - struct glink_msg msg; - __le32 chunk_size; - __le32 left_size; - } __packed req; - - if (WARN(len % 8, "RPM GLINK expects 8 byte aligned messages\n")) - return -EINVAL; - - req.msg.cmd = cpu_to_le16(RPM_CMD_TX_DATA); - req.msg.param1 = cpu_to_le16(channel->lcid); - req.msg.param2 = cpu_to_le32(channel->rcid); - req.chunk_size = cpu_to_le32(len); - req.left_size = cpu_to_le32(0); - - return qcom_glink_tx(glink, &req, sizeof(req), data, len, wait); -} - -static int qcom_glink_send(struct rpmsg_endpoint *ept, void *data, int len) -{ - struct glink_channel *channel = to_glink_channel(ept); - - return __qcom_glink_send(channel, data, len, true); -} - -static int qcom_glink_trysend(struct rpmsg_endpoint *ept, void *data, int len) -{ - struct glink_channel *channel = to_glink_channel(ept); - - return __qcom_glink_send(channel, data, len, false); -} - -/* - * Finds the device_node for the glink child interested in this channel. - */ -static struct device_node *qcom_glink_match_channel(struct device_node *node, - const char *channel) -{ - struct device_node *child; - const char *name; - const char *key; - int ret; - - for_each_available_child_of_node(node, child) { - key = "qcom,glink-channels"; - ret = of_property_read_string(child, key, &name); - if (ret) - continue; - - if (strcmp(name, channel) == 0) - return child; - } - - return NULL; -} - -static const struct rpmsg_device_ops glink_device_ops = { - .create_ept = qcom_glink_create_ept, -}; - -static const struct rpmsg_endpoint_ops glink_endpoint_ops = { - .destroy_ept = qcom_glink_destroy_ept, - .send = qcom_glink_send, - .trysend = qcom_glink_trysend, -}; - -static void qcom_glink_rpdev_release(struct device *dev) -{ - struct rpmsg_device *rpdev = to_rpmsg_device(dev); - struct glink_channel *channel = to_glink_channel(rpdev->ept); - - channel->rpdev = NULL; - kfree(rpdev); -} - -static int qcom_glink_rx_open(struct qcom_glink *glink, unsigned int rcid, - char *name) -{ - struct glink_channel *channel; - struct rpmsg_device *rpdev; - bool create_device = false; - int lcid; - int ret; - struct device_node *node; - - idr_for_each_entry(&glink->lcids, channel, lcid) { - if (!strcmp(channel->name, name)) - break; - } - - if (!channel) { - channel = qcom_glink_alloc_channel(glink, name); - if (IS_ERR(channel)) - return PTR_ERR(channel); - - /* The opening dance was initiated by the remote */ - create_device = true; - } - - mutex_lock(&glink->idr_lock); - ret = idr_alloc(&glink->rcids, channel, rcid, rcid + 1, GFP_KERNEL); - if (ret < 0) { - dev_err(glink->dev, "Unable to insert channel into rcid list\n"); - mutex_unlock(&glink->idr_lock); - goto free_channel; - } - channel->rcid = ret; - mutex_unlock(&glink->idr_lock); - - complete(&channel->open_req); - - if (create_device) { - rpdev = kzalloc(sizeof(*rpdev), GFP_KERNEL); - if (!rpdev) { - ret = -ENOMEM; - goto rcid_remove; - } - - rpdev->ept = &channel->ept; - strncpy(rpdev->id.name, name, RPMSG_NAME_SIZE); - rpdev->src = RPMSG_ADDR_ANY; - rpdev->dst = RPMSG_ADDR_ANY; - rpdev->ops = &glink_device_ops; - - node = qcom_glink_match_channel(glink->dev->of_node, name); - rpdev->dev.of_node = node; - rpdev->dev.parent = glink->dev; - rpdev->dev.release = qcom_glink_rpdev_release; - - ret = rpmsg_register_device(rpdev); - if (ret) - goto free_rpdev; - - channel->rpdev = rpdev; - } - - return 0; - -free_rpdev: - kfree(rpdev); -rcid_remove: - mutex_lock(&glink->idr_lock); - idr_remove(&glink->rcids, channel->rcid); - channel->rcid = 0; - mutex_unlock(&glink->idr_lock); -free_channel: - /* Release the reference, iff we took it */ - if (create_device) - kref_put(&channel->refcount, qcom_glink_channel_release); - - return ret; -} - -static void qcom_glink_rx_close(struct qcom_glink *glink, unsigned int rcid) -{ - struct rpmsg_channel_info chinfo; - struct glink_channel *channel; - - channel = idr_find(&glink->rcids, rcid); - if (WARN(!channel, "close request on unknown channel\n")) - return; - - if (channel->rpdev) { - strncpy(chinfo.name, channel->name, sizeof(chinfo.name)); - chinfo.src = RPMSG_ADDR_ANY; - chinfo.dst = RPMSG_ADDR_ANY; - - rpmsg_unregister_device(glink->dev, &chinfo); - } - - qcom_glink_send_close_ack(glink, channel->rcid); - - mutex_lock(&glink->idr_lock); - idr_remove(&glink->rcids, channel->rcid); - channel->rcid = 0; - mutex_unlock(&glink->idr_lock); - - kref_put(&channel->refcount, qcom_glink_channel_release); -} - -static void qcom_glink_rx_close_ack(struct qcom_glink *glink, unsigned int lcid) -{ - struct glink_channel *channel; - - channel = idr_find(&glink->lcids, lcid); - if (WARN(!channel, "close ack on unknown channel\n")) - return; - - mutex_lock(&glink->idr_lock); - idr_remove(&glink->lcids, channel->lcid); - channel->lcid = 0; - mutex_unlock(&glink->idr_lock); - - kref_put(&channel->refcount, qcom_glink_channel_release); -} - -static void qcom_glink_work(struct work_struct *work) -{ - struct qcom_glink *glink = container_of(work, struct qcom_glink, - rx_work); - struct glink_defer_cmd *dcmd; - struct glink_msg *msg; - unsigned long flags; - unsigned int param1; - unsigned int param2; - unsigned int cmd; - - for (;;) { - spin_lock_irqsave(&glink->rx_lock, flags); - if (list_empty(&glink->rx_queue)) { - spin_unlock_irqrestore(&glink->rx_lock, flags); - break; - } - dcmd = list_first_entry(&glink->rx_queue, struct glink_defer_cmd, node); - list_del(&dcmd->node); - spin_unlock_irqrestore(&glink->rx_lock, flags); - - msg = &dcmd->msg; - cmd = le16_to_cpu(msg->cmd); - param1 = le16_to_cpu(msg->param1); - param2 = le32_to_cpu(msg->param2); - - switch (cmd) { - case RPM_CMD_VERSION: - qcom_glink_send_version_ack(glink); - break; - case RPM_CMD_VERSION_ACK: - break; - case RPM_CMD_OPEN: - qcom_glink_rx_open(glink, param1, msg->data); - break; - case RPM_CMD_CLOSE: - qcom_glink_rx_close(glink, param1); - break; - case RPM_CMD_CLOSE_ACK: - qcom_glink_rx_close_ack(glink, param1); - break; - default: - WARN(1, "Unknown defer object %d\n", cmd); - break; - } - - kfree(dcmd); - } -} - static int glink_rpm_parse_toc(struct device *dev, void __iomem *msg_ram, size_t msg_ram_size, @@ -1156,56 +239,6 @@ err_inval: return -EINVAL; } -struct qcom_glink *qcom_glink_native_probe(struct device *dev, - struct qcom_glink_pipe *rx, - struct qcom_glink_pipe *tx) -{ - int irq; - int ret; - struct qcom_glink *glink; - - glink = devm_kzalloc(dev, sizeof(*glink), GFP_KERNEL); - if (!glink) - return ERR_PTR(-ENOMEM); - - glink->dev = dev; - glink->tx_pipe = tx; - glink->rx_pipe = rx; - - mutex_init(&glink->tx_lock); - spin_lock_init(&glink->rx_lock); - INIT_LIST_HEAD(&glink->rx_queue); - INIT_WORK(&glink->rx_work, qcom_glink_work); - - mutex_init(&glink->idr_lock); - idr_init(&glink->lcids); - idr_init(&glink->rcids); - - glink->mbox_client.dev = dev; - glink->mbox_chan = mbox_request_channel(&glink->mbox_client, 0); - if (IS_ERR(glink->mbox_chan)) { - if (PTR_ERR(glink->mbox_chan) != -EPROBE_DEFER) - dev_err(dev, "failed to acquire IPC channel\n"); - return ERR_CAST(glink->mbox_chan); - } - - irq = of_irq_get(dev->of_node, 0); - ret = devm_request_irq(dev, irq, - qcom_glink_intr, - IRQF_NO_SUSPEND | IRQF_SHARED, - "glink-native", glink); - if (ret) { - dev_err(dev, "failed to request IRQ\n"); - return ERR_PTR(ret); - } - - ret = qcom_glink_send_version(glink); - if (ret) - return ERR_PTR(ret); - - return glink; -} - static int glink_rpm_probe(struct platform_device *pdev) { struct qcom_glink *glink; @@ -1259,33 +292,11 @@ static int glink_rpm_probe(struct platform_device *pdev) return 0; } -static int glink_rpm_remove_device(struct device *dev, void *data) -{ - device_unregister(dev); - - return 0; -} - static int glink_rpm_remove(struct platform_device *pdev) { struct qcom_glink *glink = platform_get_drvdata(pdev); - struct glink_channel *channel; - int cid; - int ret; - - disable_irq(glink->irq); - cancel_work_sync(&glink->rx_work); - - ret = device_for_each_child(glink->dev, NULL, glink_rpm_remove_device); - if (ret) - dev_warn(glink->dev, "Can't remove GLINK devices: %d\n", ret); - - /* Release any defunct local channels, waiting for close-ack */ - idr_for_each_entry(&glink->lcids, channel, cid) - kref_put(&channel->refcount, qcom_glink_channel_release); - idr_destroy(&glink->lcids); - idr_destroy(&glink->rcids); + qcom_glink_native_remove(glink); return 0; } |