| /* |
| * 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/sizes.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 GLINK_VERSION_1 1 |
| |
| #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 glink_core_rx_intent - RX intent |
| * RX intent |
| * |
| * data: pointer to the data (may be NULL for zero-copy) |
| * id: remote or local intent ID |
| * size: size of the original intent (do not modify) |
| * reuse: To mark if the intent can be reused after first use |
| * in_use: To mark if intent is already in use for the channel |
| * offset: next write offset (initially 0) |
| */ |
| struct glink_core_rx_intent { |
| void *data; |
| u32 id; |
| size_t size; |
| bool reuse; |
| bool in_use; |
| u32 offset; |
| |
| struct list_head node; |
| }; |
| |
| /** |
| * 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; |
| |
| spinlock_t idr_lock; |
| struct idr lcids; |
| struct idr rcids; |
| unsigned long features; |
| |
| bool intentless; |
| }; |
| |
| 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 |
| * @intent_lock: lock for protection of @liids, @riids |
| * @liids: idr of all local intents |
| * @riids: idr of all remote intents |
| * @intent_work: worker responsible for transmitting rx_done packets |
| * @done_intents: list of intents that needs to be announced rx_done |
| * @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 |
| * @intent_req_lock: Synchronises multiple intent requests |
| * @intent_req_result: Result of intent request |
| * @intent_req_comp: Completion for intent_req signalling |
| */ |
| 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; |
| |
| spinlock_t intent_lock; |
| struct idr liids; |
| struct idr riids; |
| struct work_struct intent_work; |
| struct list_head done_intents; |
| |
| struct glink_core_rx_intent *buf; |
| int buf_offset; |
| int buf_size; |
| |
| struct completion open_ack; |
| struct completion open_req; |
| |
| struct mutex intent_req_lock; |
| bool intent_req_result; |
| struct completion intent_req_comp; |
| }; |
| |
| #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_INTENT 5 |
| #define RPM_CMD_RX_DONE 6 |
| #define RPM_CMD_RX_INTENT_REQ 7 |
| #define RPM_CMD_RX_INTENT_REQ_ACK 8 |
| #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 RPM_CMD_RX_DONE_W_REUSE 14 |
| |
| #define GLINK_FEATURE_INTENTLESS BIT(1) |
| |
| static void qcom_glink_rx_done_work(struct work_struct *work); |
| |
| 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); |
| spin_lock_init(&channel->intent_lock); |
| |
| channel->glink = glink; |
| channel->name = kstrdup(name, GFP_KERNEL); |
| |
| init_completion(&channel->open_req); |
| init_completion(&channel->open_ack); |
| init_completion(&channel->intent_req_comp); |
| |
| INIT_LIST_HEAD(&channel->done_intents); |
| INIT_WORK(&channel->intent_work, qcom_glink_rx_done_work); |
| |
| idr_init(&channel->liids); |
| idr_init(&channel->riids); |
| 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); |
| struct glink_core_rx_intent *intent; |
| struct glink_core_rx_intent *tmp; |
| unsigned long flags; |
| int iid; |
| |
| /* cancel pending rx_done work */ |
| cancel_work_sync(&channel->intent_work); |
| |
| spin_lock_irqsave(&channel->intent_lock, flags); |
| /* Free all non-reuse intents pending rx_done work */ |
| list_for_each_entry_safe(intent, tmp, &channel->done_intents, node) { |
| if (!intent->reuse) { |
| kfree(intent->data); |
| kfree(intent); |
| } |
| } |
| |
| idr_for_each_entry(&channel->liids, tmp, iid) { |
| kfree(tmp->data); |
| kfree(tmp); |
| } |
| idr_destroy(&channel->liids); |
| |
| idr_for_each_entry(&channel->riids, tmp, iid) |
| kfree(tmp); |
| idr_destroy(&channel->riids); |
| spin_unlock_irqrestore(&channel->intent_lock, flags); |
| |
| 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, unsigned int offset, size_t count) |
| { |
| glink->rx_pipe->peak(glink->rx_pipe, data, offset, 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; |
| |
| ret = mutex_lock_interruptible(&glink->tx_lock); |
| if (ret) |
| return ret; |
| |
| while (qcom_glink_tx_avail(glink) < tlen) { |
| if (!wait) { |
| ret = -EAGAIN; |
| 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(GLINK_VERSION_1); |
| msg.param2 = cpu_to_le32(glink->features); |
| |
| 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(GLINK_VERSION_1); |
| msg.param2 = cpu_to_le32(glink->features); |
| |
| 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); |
| } |
| |
| static void qcom_glink_handle_intent_req_ack(struct qcom_glink *glink, |
| unsigned int cid, bool granted) |
| { |
| struct glink_channel *channel; |
| unsigned long flags; |
| |
| spin_lock_irqsave(&glink->idr_lock, flags); |
| channel = idr_find(&glink->rcids, cid); |
| spin_unlock_irqrestore(&glink->idr_lock, flags); |
| if (!channel) { |
| dev_err(glink->dev, "unable to find channel\n"); |
| return; |
| } |
| |
| channel->intent_req_result = granted; |
| complete(&channel->intent_req_comp); |
| } |
| |
| /** |
| * 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; |
| unsigned long flags; |
| |
| kref_get(&channel->refcount); |
| |
| spin_lock_irqsave(&glink->idr_lock, flags); |
| ret = idr_alloc_cyclic(&glink->lcids, channel, |
| RPM_GLINK_CID_MIN, RPM_GLINK_CID_MAX, |
| GFP_ATOMIC); |
| spin_unlock_irqrestore(&glink->idr_lock, flags); |
| 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: |
| spin_lock_irqsave(&glink->idr_lock, flags); |
| idr_remove(&glink->lcids, channel->lcid); |
| channel->lcid = 0; |
| spin_unlock_irqrestore(&glink->idr_lock, flags); |
| |
| 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 void qcom_glink_rx_done_work(struct work_struct *work) |
| { |
| struct glink_channel *channel = container_of(work, struct glink_channel, |
| intent_work); |
| struct qcom_glink *glink = channel->glink; |
| struct glink_core_rx_intent *intent, *tmp; |
| struct { |
| u16 id; |
| u16 lcid; |
| u32 liid; |
| } __packed cmd; |
| |
| unsigned int cid = channel->lcid; |
| unsigned int iid; |
| bool reuse; |
| unsigned long flags; |
| |
| spin_lock_irqsave(&channel->intent_lock, flags); |
| list_for_each_entry_safe(intent, tmp, &channel->done_intents, node) { |
| list_del(&intent->node); |
| spin_unlock_irqrestore(&channel->intent_lock, flags); |
| iid = intent->id; |
| reuse = intent->reuse; |
| |
| cmd.id = reuse ? RPM_CMD_RX_DONE_W_REUSE : RPM_CMD_RX_DONE; |
| cmd.lcid = cid; |
| cmd.liid = iid; |
| |
| qcom_glink_tx(glink, &cmd, sizeof(cmd), NULL, 0, true); |
| if (!reuse) { |
| kfree(intent->data); |
| kfree(intent); |
| } |
| spin_lock_irqsave(&channel->intent_lock, flags); |
| } |
| spin_unlock_irqrestore(&channel->intent_lock, flags); |
| } |
| |
| static void qcom_glink_rx_done(struct qcom_glink *glink, |
| struct glink_channel *channel, |
| struct glink_core_rx_intent *intent) |
| { |
| /* We don't send RX_DONE to intentless systems */ |
| if (glink->intentless) { |
| kfree(intent->data); |
| kfree(intent); |
| return; |
| } |
| |
| /* Take it off the tree of receive intents */ |
| if (!intent->reuse) { |
| spin_lock(&channel->intent_lock); |
| idr_remove(&channel->liids, intent->id); |
| spin_unlock(&channel->intent_lock); |
| } |
| |
| /* Schedule the sending of a rx_done indication */ |
| spin_lock(&channel->intent_lock); |
| list_add_tail(&intent->node, &channel->done_intents); |
| spin_unlock(&channel->intent_lock); |
| |
| schedule_work(&channel->intent_work); |
| } |
| |
| /** |
| * qcom_glink_receive_version() - receive version/features from remote system |
| * |
| * @glink: pointer to transport interface |
| * @r_version: remote version |
| * @r_features: remote features |
| * |
| * This function is called in response to a remote-initiated version/feature |
| * negotiation sequence. |
| */ |
| static void qcom_glink_receive_version(struct qcom_glink *glink, |
| u32 version, |
| u32 features) |
| { |
| switch (version) { |
| case 0: |
| break; |
| case GLINK_VERSION_1: |
| glink->features &= features; |
| /* FALLTHROUGH */ |
| default: |
| qcom_glink_send_version_ack(glink); |
| break; |
| } |
| } |
| |
| /** |
| * qcom_glink_receive_version_ack() - receive negotiation ack from remote system |
| * |
| * @glink: pointer to transport interface |
| * @r_version: remote version response |
| * @r_features: remote features response |
| * |
| * This function is called in response to a local-initiated version/feature |
| * negotiation sequence and is the counter-offer from the remote side based |
| * upon the initial version and feature set requested. |
| */ |
| static void qcom_glink_receive_version_ack(struct qcom_glink *glink, |
| u32 version, |
| u32 features) |
| { |
| switch (version) { |
| case 0: |
| /* Version negotiation failed */ |
| break; |
| case GLINK_VERSION_1: |
| if (features == glink->features) |
| break; |
| |
| glink->features &= features; |
| /* FALLTHROUGH */ |
| default: |
| qcom_glink_send_version(glink); |
| break; |
| } |
| } |
| |
| /** |
| * qcom_glink_send_intent_req_ack() - convert an rx intent request ack cmd to |
| wire format and transmit |
| * @glink: The transport to transmit on. |
| * @channel: The glink channel |
| * @granted: The request response to encode. |
| * |
| * Return: 0 on success or standard Linux error code. |
| */ |
| static int qcom_glink_send_intent_req_ack(struct qcom_glink *glink, |
| struct glink_channel *channel, |
| bool granted) |
| { |
| struct glink_msg msg; |
| |
| msg.cmd = cpu_to_le16(RPM_CMD_RX_INTENT_REQ_ACK); |
| msg.param1 = cpu_to_le16(channel->lcid); |
| msg.param2 = cpu_to_le32(granted); |
| |
| qcom_glink_tx(glink, &msg, sizeof(msg), NULL, 0, true); |
| |
| return 0; |
| } |
| |
| /** |
| * qcom_glink_advertise_intent - convert an rx intent cmd to wire format and |
| * transmit |
| * @glink: The transport to transmit on. |
| * @channel: The local channel |
| * @size: The intent to pass on to remote. |
| * |
| * Return: 0 on success or standard Linux error code. |
| */ |
| static int qcom_glink_advertise_intent(struct qcom_glink *glink, |
| struct glink_channel *channel, |
| struct glink_core_rx_intent *intent) |
| { |
| struct command { |
| u16 id; |
| u16 lcid; |
| u32 count; |
| u32 size; |
| u32 liid; |
| } __packed; |
| struct command cmd; |
| |
| cmd.id = cpu_to_le16(RPM_CMD_INTENT); |
| cmd.lcid = cpu_to_le16(channel->lcid); |
| cmd.count = cpu_to_le32(1); |
| cmd.size = cpu_to_le32(intent->size); |
| cmd.liid = cpu_to_le32(intent->id); |
| |
| qcom_glink_tx(glink, &cmd, sizeof(cmd), NULL, 0, true); |
| |
| return 0; |
| } |
| |
| static struct glink_core_rx_intent * |
| qcom_glink_alloc_intent(struct qcom_glink *glink, |
| struct glink_channel *channel, |
| size_t size, |
| bool reuseable) |
| { |
| struct glink_core_rx_intent *intent; |
| int ret; |
| unsigned long flags; |
| |
| intent = kzalloc(sizeof(*intent), GFP_KERNEL); |
| if (!intent) |
| return NULL; |
| |
| intent->data = kzalloc(size, GFP_KERNEL); |
| if (!intent->data) |
| goto free_intent; |
| |
| spin_lock_irqsave(&channel->intent_lock, flags); |
| ret = idr_alloc_cyclic(&channel->liids, intent, 1, -1, GFP_ATOMIC); |
| if (ret < 0) { |
| spin_unlock_irqrestore(&channel->intent_lock, flags); |
| goto free_data; |
| } |
| spin_unlock_irqrestore(&channel->intent_lock, flags); |
| |
| intent->id = ret; |
| intent->size = size; |
| intent->reuse = reuseable; |
| |
| return intent; |
| |
| free_data: |
| kfree(intent->data); |
| free_intent: |
| kfree(intent); |
| return NULL; |
| } |
| |
| static void qcom_glink_handle_rx_done(struct qcom_glink *glink, |
| u32 cid, uint32_t iid, |
| bool reuse) |
| { |
| struct glink_core_rx_intent *intent; |
| struct glink_channel *channel; |
| unsigned long flags; |
| |
| spin_lock_irqsave(&glink->idr_lock, flags); |
| channel = idr_find(&glink->rcids, cid); |
| spin_unlock_irqrestore(&glink->idr_lock, flags); |
| if (!channel) { |
| dev_err(glink->dev, "invalid channel id received\n"); |
| return; |
| } |
| |
| spin_lock_irqsave(&channel->intent_lock, flags); |
| intent = idr_find(&channel->riids, iid); |
| |
| if (!intent) { |
| spin_unlock_irqrestore(&channel->intent_lock, flags); |
| dev_err(glink->dev, "invalid intent id received\n"); |
| return; |
| } |
| |
| intent->in_use = false; |
| |
| if (!reuse) { |
| idr_remove(&channel->riids, intent->id); |
| kfree(intent); |
| } |
| spin_unlock_irqrestore(&channel->intent_lock, flags); |
| } |
| |
| /** |
| * qcom_glink_handle_intent_req() - Receive a request for rx_intent |
| * from remote side |
| * if_ptr: Pointer to the transport interface |
| * rcid: Remote channel ID |
| * size: size of the intent |
| * |
| * The function searches for the local channel to which the request for |
| * rx_intent has arrived and allocates and notifies the remote back |
| */ |
| static void qcom_glink_handle_intent_req(struct qcom_glink *glink, |
| u32 cid, size_t size) |
| { |
| struct glink_core_rx_intent *intent; |
| struct glink_channel *channel; |
| unsigned long flags; |
| |
| spin_lock_irqsave(&glink->idr_lock, flags); |
| channel = idr_find(&glink->rcids, cid); |
| spin_unlock_irqrestore(&glink->idr_lock, flags); |
| |
| if (!channel) { |
| pr_err("%s channel not found for cid %d\n", __func__, cid); |
| return; |
| } |
| |
| intent = qcom_glink_alloc_intent(glink, channel, size, false); |
| if (intent) |
| qcom_glink_advertise_intent(glink, channel, intent); |
| |
| qcom_glink_send_intent_req_ack(glink, channel, !!intent); |
| } |
| |
| 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, 0, 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_core_rx_intent *intent; |
| 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; |
| unsigned int liid; |
| int ret = 0; |
| unsigned long flags; |
| |
| if (avail < sizeof(hdr)) { |
| dev_dbg(glink->dev, "Not enough data in fifo\n"); |
| return -EAGAIN; |
| } |
| |
| qcom_glink_rx_peak(glink, &hdr, 0, 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); |
| spin_lock_irqsave(&glink->idr_lock, flags); |
| channel = idr_find(&glink->rcids, rcid); |
| spin_unlock_irqrestore(&glink->idr_lock, flags); |
| if (!channel) { |
| dev_dbg(glink->dev, "Data on non-existing channel\n"); |
| |
| /* Drop the message */ |
| goto advance_rx; |
| } |
| |
| if (glink->intentless) { |
| /* Might have an ongoing, fragmented, message to append */ |
| if (!channel->buf) { |
| intent = kzalloc(sizeof(*intent), GFP_ATOMIC); |
| if (!intent) |
| return -ENOMEM; |
| |
| intent->data = kmalloc(chunk_size + left_size, |
| GFP_ATOMIC); |
| if (!intent->data) { |
| kfree(intent); |
| return -ENOMEM; |
| } |
| |
| intent->id = 0xbabababa; |
| intent->size = chunk_size + left_size; |
| intent->offset = 0; |
| |
| channel->buf = intent; |
| } else { |
| intent = channel->buf; |
| } |
| } else { |
| liid = le32_to_cpu(hdr.msg.param2); |
| |
| spin_lock_irqsave(&channel->intent_lock, flags); |
| intent = idr_find(&channel->liids, liid); |
| spin_unlock_irqrestore(&channel->intent_lock, flags); |
| |
| if (!intent) { |
| dev_err(glink->dev, |
| "no intent found for channel %s intent %d", |
| channel->name, liid); |
| goto advance_rx; |
| } |
| } |
| |
| if (intent->size - intent->offset < chunk_size) { |
| dev_err(glink->dev, "Insufficient space in intent\n"); |
| |
| /* The packet header lied, drop payload */ |
| goto advance_rx; |
| } |
| |
| qcom_glink_rx_peak(glink, intent->data + intent->offset, |
| sizeof(hdr), chunk_size); |
| intent->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, |
| intent->data, |
| intent->offset, |
| channel->ept.priv, |
| RPMSG_ADDR_ANY); |
| } |
| spin_unlock(&channel->recv_lock); |
| |
| intent->offset = 0; |
| channel->buf = NULL; |
| |
| qcom_glink_rx_done(glink, channel, intent); |
| } |
| |
| advance_rx: |
| qcom_glink_rx_advance(glink, ALIGN(sizeof(hdr) + chunk_size, 8)); |
| |
| return ret; |
| } |
| |
| static void qcom_glink_handle_intent(struct qcom_glink *glink, |
| unsigned int cid, |
| unsigned int count, |
| size_t avail) |
| { |
| struct glink_core_rx_intent *intent; |
| struct glink_channel *channel; |
| struct intent_pair { |
| __le32 size; |
| __le32 iid; |
| }; |
| |
| struct { |
| struct glink_msg msg; |
| struct intent_pair intents[]; |
| } __packed * msg; |
| |
| const size_t msglen = sizeof(*msg) + sizeof(struct intent_pair) * count; |
| int ret; |
| int i; |
| unsigned long flags; |
| |
| if (avail < msglen) { |
| dev_dbg(glink->dev, "Not enough data in fifo\n"); |
| return; |
| } |
| |
| spin_lock_irqsave(&glink->idr_lock, flags); |
| channel = idr_find(&glink->rcids, cid); |
| spin_unlock_irqrestore(&glink->idr_lock, flags); |
| if (!channel) { |
| dev_err(glink->dev, "intents for non-existing channel\n"); |
| return; |
| } |
| |
| msg = kmalloc(msglen, GFP_ATOMIC); |
| if (!msg) |
| return; |
| |
| qcom_glink_rx_peak(glink, msg, 0, msglen); |
| |
| for (i = 0; i < count; ++i) { |
| intent = kzalloc(sizeof(*intent), GFP_ATOMIC); |
| if (!intent) |
| break; |
| |
| intent->id = le32_to_cpu(msg->intents[i].iid); |
| intent->size = le32_to_cpu(msg->intents[i].size); |
| |
| spin_lock_irqsave(&channel->intent_lock, flags); |
| ret = idr_alloc(&channel->riids, intent, |
| intent->id, intent->id + 1, GFP_ATOMIC); |
| spin_unlock_irqrestore(&channel->intent_lock, flags); |
| |
| if (ret < 0) |
| dev_err(glink->dev, "failed to store remote intent\n"); |
| } |
| |
| kfree(msg); |
| qcom_glink_rx_advance(glink, ALIGN(msglen, 8)); |
| } |
| |
| static int qcom_glink_rx_open_ack(struct qcom_glink *glink, unsigned int lcid) |
| { |
| struct glink_channel *channel; |
| |
| spin_lock(&glink->idr_lock); |
| channel = idr_find(&glink->lcids, lcid); |
| spin_unlock(&glink->idr_lock); |
| 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 = 0; |
| |
| for (;;) { |
| avail = qcom_glink_rx_avail(glink); |
| if (avail < sizeof(msg)) |
| break; |
| |
| qcom_glink_rx_peak(glink, &msg, 0, 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: |
| case RPM_CMD_RX_INTENT_REQ: |
| 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); |
| break; |
| case RPM_CMD_INTENT: |
| qcom_glink_handle_intent(glink, param1, param2, avail); |
| break; |
| case RPM_CMD_RX_DONE: |
| qcom_glink_handle_rx_done(glink, param1, param2, false); |
| qcom_glink_rx_advance(glink, ALIGN(sizeof(msg), 8)); |
| break; |
| case RPM_CMD_RX_DONE_W_REUSE: |
| qcom_glink_handle_rx_done(glink, param1, param2, true); |
| qcom_glink_rx_advance(glink, ALIGN(sizeof(msg), 8)); |
| break; |
| case RPM_CMD_RX_INTENT_REQ_ACK: |
| qcom_glink_handle_intent_req_ack(glink, param1, param2); |
| qcom_glink_rx_advance(glink, ALIGN(sizeof(msg), 8)); |
| 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; |
| unsigned long flags; |
| |
| 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*/ |
| spin_lock_irqsave(&glink->idr_lock, flags); |
| idr_remove(&glink->lcids, channel->lcid); |
| spin_unlock_irqrestore(&glink->idr_lock, flags); |
| |
| 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 qcom_glink_send_open_req() reference and the last reference |
| * will be relesed after receiving remote_close or transport unregister |
| * by calling qcom_glink_native_remove(). |
| */ |
| qcom_glink_send_close_req(glink, channel); |
| |
| 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; |
| unsigned long flags; |
| |
| spin_lock_irqsave(&glink->idr_lock, flags); |
| idr_for_each_entry(&glink->rcids, channel, cid) { |
| if (!strcmp(channel->name, name)) |
| break; |
| } |
| spin_unlock_irqrestore(&glink->idr_lock, flags); |
| |
| 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 int qcom_glink_announce_create(struct rpmsg_device *rpdev) |
| { |
| struct glink_channel *channel = to_glink_channel(rpdev->ept); |
| struct glink_core_rx_intent *intent; |
| struct qcom_glink *glink = channel->glink; |
| int num_intents = glink->intentless ? 0 : 5; |
| |
| /* Channel is now open, advertise base set of intents */ |
| while (num_intents--) { |
| intent = qcom_glink_alloc_intent(glink, channel, SZ_1K, true); |
| if (!intent) |
| break; |
| |
| qcom_glink_advertise_intent(glink, channel, intent); |
| } |
| |
| return 0; |
| } |
| |
| 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_request_intent(struct qcom_glink *glink, |
| struct glink_channel *channel, |
| size_t size) |
| { |
| struct { |
| u16 id; |
| u16 cid; |
| u32 size; |
| } __packed cmd; |
| |
| int ret; |
| |
| mutex_lock(&channel->intent_req_lock); |
| |
| reinit_completion(&channel->intent_req_comp); |
| |
| cmd.id = RPM_CMD_RX_INTENT_REQ; |
| cmd.cid = channel->lcid; |
| cmd.size = size; |
| |
| ret = qcom_glink_tx(glink, &cmd, sizeof(cmd), NULL, 0, true); |
| if (ret) |
| goto unlock; |
| |
| ret = wait_for_completion_timeout(&channel->intent_req_comp, 10 * HZ); |
| if (!ret) { |
| dev_err(glink->dev, "intent request timed out\n"); |
| ret = -ETIMEDOUT; |
| } else { |
| ret = channel->intent_req_result ? 0 : -ECANCELED; |
| } |
| |
| unlock: |
| mutex_unlock(&channel->intent_req_lock); |
| return ret; |
| } |
| |
| static int __qcom_glink_send(struct glink_channel *channel, |
| void *data, int len, bool wait) |
| { |
| struct qcom_glink *glink = channel->glink; |
| struct glink_core_rx_intent *intent = NULL; |
| struct glink_core_rx_intent *tmp; |
| int iid = 0; |
| struct { |
| struct glink_msg msg; |
| __le32 chunk_size; |
| __le32 left_size; |
| } __packed req; |
| int ret; |
| unsigned long flags; |
| |
| if (!glink->intentless) { |
| while (!intent) { |
| spin_lock_irqsave(&channel->intent_lock, flags); |
| idr_for_each_entry(&channel->riids, tmp, iid) { |
| if (tmp->size >= len && !tmp->in_use) { |
| tmp->in_use = true; |
| intent = tmp; |
| break; |
| } |
| } |
| spin_unlock_irqrestore(&channel->intent_lock, flags); |
| |
| /* We found an available intent */ |
| if (intent) |
| break; |
| |
| if (!wait) |
| return -EBUSY; |
| |
| ret = qcom_glink_request_intent(glink, channel, len); |
| if (ret < 0) |
| return ret; |
| } |
| |
| iid = intent->id; |
| } |
| |
| req.msg.cmd = cpu_to_le16(RPM_CMD_TX_DATA); |
| req.msg.param1 = cpu_to_le16(channel->lcid); |
| req.msg.param2 = cpu_to_le32(iid); |
| req.chunk_size = cpu_to_le32(len); |
| req.left_size = cpu_to_le32(0); |
| |
| ret = qcom_glink_tx(glink, &req, sizeof(req), data, len, wait); |
| |
| /* Mark intent available if we failed */ |
| if (ret && intent) |
| intent->in_use = false; |
| |
| return ret; |
| } |
| |
| 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, |
| .announce_create = qcom_glink_announce_create, |
| }; |
| |
| 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; |
| unsigned long flags; |
| |
| spin_lock_irqsave(&glink->idr_lock, flags); |
| idr_for_each_entry(&glink->lcids, channel, lcid) { |
| if (!strcmp(channel->name, name)) |
| break; |
| } |
| spin_unlock_irqrestore(&glink->idr_lock, flags); |
| |
| 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; |
| } |
| |
| spin_lock_irqsave(&glink->idr_lock, flags); |
| ret = idr_alloc(&glink->rcids, channel, rcid, rcid + 1, GFP_ATOMIC); |
| if (ret < 0) { |
| dev_err(glink->dev, "Unable to insert channel into rcid list\n"); |
| spin_unlock_irqrestore(&glink->idr_lock, flags); |
| goto free_channel; |
| } |
| channel->rcid = ret; |
| spin_unlock_irqrestore(&glink->idr_lock, flags); |
| |
| 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 rcid_remove; |
| |
| channel->rpdev = rpdev; |
| } |
| |
| return 0; |
| |
| rcid_remove: |
| spin_lock_irqsave(&glink->idr_lock, flags); |
| idr_remove(&glink->rcids, channel->rcid); |
| channel->rcid = 0; |
| spin_unlock_irqrestore(&glink->idr_lock, flags); |
| 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; |
| unsigned long flags; |
| |
| spin_lock_irqsave(&glink->idr_lock, flags); |
| channel = idr_find(&glink->rcids, rcid); |
| spin_unlock_irqrestore(&glink->idr_lock, flags); |
| if (WARN(!channel, "close request on unknown channel\n")) |
| return; |
| |
| /* cancel pending rx_done work */ |
| cancel_work_sync(&channel->intent_work); |
| |
| 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); |
| |
| spin_lock_irqsave(&glink->idr_lock, flags); |
| idr_remove(&glink->rcids, channel->rcid); |
| channel->rcid = 0; |
| spin_unlock_irqrestore(&glink->idr_lock, flags); |
| |
| 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; |
| unsigned long flags; |
| |
| spin_lock_irqsave(&glink->idr_lock, flags); |
| channel = idr_find(&glink->lcids, lcid); |
| if (WARN(!channel, "close ack on unknown channel\n")) { |
| spin_unlock_irqrestore(&glink->idr_lock, flags); |
| return; |
| } |
| |
| idr_remove(&glink->lcids, channel->lcid); |
| channel->lcid = 0; |
| spin_unlock_irqrestore(&glink->idr_lock, flags); |
| |
| 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_receive_version(glink, param1, param2); |
| break; |
| case RPM_CMD_VERSION_ACK: |
| qcom_glink_receive_version_ack(glink, param1, param2); |
| 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; |
| case RPM_CMD_RX_INTENT_REQ: |
| qcom_glink_handle_intent_req(glink, param1, param2); |
| break; |
| default: |
| WARN(1, "Unknown defer object %d\n", cmd); |
| break; |
| } |
| |
| kfree(dcmd); |
| } |
| } |
| |
| static void qcom_glink_cancel_rx_work(struct qcom_glink *glink) |
| { |
| struct glink_defer_cmd *dcmd; |
| struct glink_defer_cmd *tmp; |
| |
| /* cancel any pending deferred rx_work */ |
| cancel_work_sync(&glink->rx_work); |
| |
| list_for_each_entry_safe(dcmd, tmp, &glink->rx_queue, node) |
| kfree(dcmd); |
| } |
| |
| struct qcom_glink *qcom_glink_native_probe(struct device *dev, |
| unsigned long features, |
| struct qcom_glink_pipe *rx, |
| struct qcom_glink_pipe *tx, |
| bool intentless) |
| { |
| 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; |
| |
| glink->features = features; |
| glink->intentless = intentless; |
| |
| 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); |
| |
| spin_lock_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; |
| } |
| EXPORT_SYMBOL_GPL(qcom_glink_native_probe); |
| |
| 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); |
| qcom_glink_cancel_rx_work(glink); |
| |
| 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); |
| |
| /* Release any defunct local channels, waiting for close-req */ |
| idr_for_each_entry(&glink->rcids, channel, cid) |
| kref_put(&channel->refcount, qcom_glink_channel_release); |
| |
| idr_destroy(&glink->lcids); |
| idr_destroy(&glink->rcids); |
| mbox_free_channel(glink->mbox_chan); |
| } |
| EXPORT_SYMBOL_GPL(qcom_glink_native_remove); |
| |
| void qcom_glink_native_unregister(struct qcom_glink *glink) |
| { |
| device_unregister(glink->dev); |
| } |
| EXPORT_SYMBOL_GPL(qcom_glink_native_unregister); |
| |
| MODULE_DESCRIPTION("Qualcomm GLINK driver"); |
| MODULE_LICENSE("GPL v2"); |