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![Bjorn Andersson](/assets/img/avatar_default.png)
Rather than duplicating most of the code for constructing the initial TX_DATA and subsequent TX_DATA_CONT packets, roll them into a single loop. Signed-off-by: Bjorn Andersson <quic_bjorande@quicinc.com> Reviewed-by: Chris Lew <quic_clew@quicinc.com> Signed-off-by: Bjorn Andersson <andersson@kernel.org> Link: https://lore.kernel.org/r/20230418163018.785524-3-quic_bjorande@quicinc.com
1821 lines
44 KiB
C
1821 lines
44 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (c) 2016-2017, Linaro Ltd
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*/
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#include <linux/idr.h>
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#include <linux/interrupt.h>
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#include <linux/io.h>
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#include <linux/list.h>
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#include <linux/mfd/syscon.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/of_address.h>
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#include <linux/platform_device.h>
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#include <linux/regmap.h>
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#include <linux/rpmsg.h>
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#include <linux/sizes.h>
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#include <linux/slab.h>
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#include <linux/wait.h>
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#include <linux/workqueue.h>
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#include <linux/mailbox_client.h>
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#include "rpmsg_internal.h"
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#include "qcom_glink_native.h"
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#define GLINK_NAME_SIZE 32
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#define GLINK_VERSION_1 1
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#define RPM_GLINK_CID_MIN 1
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#define RPM_GLINK_CID_MAX 65536
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struct glink_msg {
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__le16 cmd;
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__le16 param1;
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__le32 param2;
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u8 data[];
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} __packed;
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/**
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* struct glink_defer_cmd - deferred incoming control message
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* @node: list node
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* @msg: message header
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* @data: payload of the message
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*
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* Copy of a received control message, to be added to @rx_queue and processed
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* by @rx_work of @qcom_glink.
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*/
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struct glink_defer_cmd {
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struct list_head node;
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struct glink_msg msg;
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u8 data[];
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};
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/**
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* struct glink_core_rx_intent - RX intent
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* RX intent
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*
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* @data: pointer to the data (may be NULL for zero-copy)
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* @id: remote or local intent ID
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* @size: size of the original intent (do not modify)
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* @reuse: To mark if the intent can be reused after first use
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* @in_use: To mark if intent is already in use for the channel
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* @offset: next write offset (initially 0)
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* @node: list node
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*/
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struct glink_core_rx_intent {
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void *data;
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u32 id;
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size_t size;
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bool reuse;
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bool in_use;
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u32 offset;
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struct list_head node;
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};
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/**
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* struct qcom_glink - driver context, relates to one remote subsystem
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* @dev: reference to the associated struct device
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* @rx_pipe: pipe object for receive FIFO
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* @tx_pipe: pipe object for transmit FIFO
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* @rx_work: worker for handling received control messages
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* @rx_lock: protects the @rx_queue
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* @rx_queue: queue of received control messages to be processed in @rx_work
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* @tx_lock: synchronizes operations on the tx fifo
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* @idr_lock: synchronizes @lcids and @rcids modifications
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* @lcids: idr of all channels with a known local channel id
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* @rcids: idr of all channels with a known remote channel id
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* @features: remote features
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* @intentless: flag to indicate that there is no intent
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* @tx_avail_notify: Waitqueue for pending tx tasks
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* @sent_read_notify: flag to check cmd sent or not
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* @abort_tx: flag indicating that all tx attempts should fail
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*/
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struct qcom_glink {
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struct device *dev;
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struct qcom_glink_pipe *rx_pipe;
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struct qcom_glink_pipe *tx_pipe;
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struct work_struct rx_work;
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spinlock_t rx_lock;
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struct list_head rx_queue;
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spinlock_t tx_lock;
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spinlock_t idr_lock;
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struct idr lcids;
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struct idr rcids;
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unsigned long features;
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bool intentless;
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wait_queue_head_t tx_avail_notify;
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bool sent_read_notify;
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bool abort_tx;
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};
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enum {
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GLINK_STATE_CLOSED,
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GLINK_STATE_OPENING,
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GLINK_STATE_OPEN,
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GLINK_STATE_CLOSING,
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};
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/**
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* struct glink_channel - internal representation of a channel
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* @rpdev: rpdev reference, only used for primary endpoints
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* @ept: rpmsg endpoint this channel is associated with
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* @glink: qcom_glink context handle
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* @refcount: refcount for the channel object
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* @recv_lock: guard for @ept.cb
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* @name: unique channel name/identifier
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* @lcid: channel id, in local space
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* @rcid: channel id, in remote space
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* @intent_lock: lock for protection of @liids, @riids
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* @liids: idr of all local intents
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* @riids: idr of all remote intents
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* @intent_work: worker responsible for transmitting rx_done packets
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* @done_intents: list of intents that needs to be announced rx_done
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* @buf: receive buffer, for gathering fragments
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* @buf_offset: write offset in @buf
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* @buf_size: size of current @buf
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* @open_ack: completed once remote has acked the open-request
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* @open_req: completed once open-request has been received
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* @intent_req_lock: Synchronises multiple intent requests
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* @intent_req_result: Result of intent request
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* @intent_received: flag indicating that an intent has been received
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* @intent_req_wq: wait queue for intent_req signalling
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*/
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struct glink_channel {
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struct rpmsg_endpoint ept;
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struct rpmsg_device *rpdev;
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struct qcom_glink *glink;
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struct kref refcount;
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spinlock_t recv_lock;
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char *name;
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unsigned int lcid;
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unsigned int rcid;
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spinlock_t intent_lock;
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struct idr liids;
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struct idr riids;
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struct work_struct intent_work;
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struct list_head done_intents;
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struct glink_core_rx_intent *buf;
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int buf_offset;
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int buf_size;
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struct completion open_ack;
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struct completion open_req;
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struct mutex intent_req_lock;
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int intent_req_result;
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bool intent_received;
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wait_queue_head_t intent_req_wq;
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};
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#define to_glink_channel(_ept) container_of(_ept, struct glink_channel, ept)
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static const struct rpmsg_endpoint_ops glink_endpoint_ops;
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#define GLINK_CMD_VERSION 0
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#define GLINK_CMD_VERSION_ACK 1
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#define GLINK_CMD_OPEN 2
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#define GLINK_CMD_CLOSE 3
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#define GLINK_CMD_OPEN_ACK 4
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#define GLINK_CMD_INTENT 5
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#define GLINK_CMD_RX_DONE 6
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#define GLINK_CMD_RX_INTENT_REQ 7
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#define GLINK_CMD_RX_INTENT_REQ_ACK 8
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#define GLINK_CMD_TX_DATA 9
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#define GLINK_CMD_CLOSE_ACK 11
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#define GLINK_CMD_TX_DATA_CONT 12
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#define GLINK_CMD_READ_NOTIF 13
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#define GLINK_CMD_RX_DONE_W_REUSE 14
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#define GLINK_FEATURE_INTENTLESS BIT(1)
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static void qcom_glink_rx_done_work(struct work_struct *work);
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static struct glink_channel *qcom_glink_alloc_channel(struct qcom_glink *glink,
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const char *name)
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{
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struct glink_channel *channel;
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channel = kzalloc(sizeof(*channel), GFP_KERNEL);
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if (!channel)
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return ERR_PTR(-ENOMEM);
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/* Setup glink internal glink_channel data */
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spin_lock_init(&channel->recv_lock);
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spin_lock_init(&channel->intent_lock);
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mutex_init(&channel->intent_req_lock);
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channel->glink = glink;
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channel->name = kstrdup(name, GFP_KERNEL);
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init_completion(&channel->open_req);
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init_completion(&channel->open_ack);
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init_waitqueue_head(&channel->intent_req_wq);
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INIT_LIST_HEAD(&channel->done_intents);
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INIT_WORK(&channel->intent_work, qcom_glink_rx_done_work);
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idr_init(&channel->liids);
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idr_init(&channel->riids);
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kref_init(&channel->refcount);
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return channel;
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}
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static void qcom_glink_channel_release(struct kref *ref)
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{
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struct glink_channel *channel = container_of(ref, struct glink_channel,
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refcount);
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struct glink_core_rx_intent *intent;
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struct glink_core_rx_intent *tmp;
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unsigned long flags;
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int iid;
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/* cancel pending rx_done work */
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cancel_work_sync(&channel->intent_work);
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spin_lock_irqsave(&channel->intent_lock, flags);
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/* Free all non-reuse intents pending rx_done work */
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list_for_each_entry_safe(intent, tmp, &channel->done_intents, node) {
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if (!intent->reuse) {
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kfree(intent->data);
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kfree(intent);
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}
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}
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idr_for_each_entry(&channel->liids, tmp, iid) {
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kfree(tmp->data);
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kfree(tmp);
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}
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idr_destroy(&channel->liids);
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idr_for_each_entry(&channel->riids, tmp, iid)
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kfree(tmp);
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idr_destroy(&channel->riids);
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spin_unlock_irqrestore(&channel->intent_lock, flags);
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kfree(channel->name);
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kfree(channel);
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}
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static size_t qcom_glink_rx_avail(struct qcom_glink *glink)
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{
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return glink->rx_pipe->avail(glink->rx_pipe);
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}
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static void qcom_glink_rx_peek(struct qcom_glink *glink,
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void *data, unsigned int offset, size_t count)
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{
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glink->rx_pipe->peek(glink->rx_pipe, data, offset, count);
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}
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static void qcom_glink_rx_advance(struct qcom_glink *glink, size_t count)
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{
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glink->rx_pipe->advance(glink->rx_pipe, count);
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}
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static size_t qcom_glink_tx_avail(struct qcom_glink *glink)
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{
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return glink->tx_pipe->avail(glink->tx_pipe);
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}
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static void qcom_glink_tx_write(struct qcom_glink *glink,
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const void *hdr, size_t hlen,
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const void *data, size_t dlen)
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{
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glink->tx_pipe->write(glink->tx_pipe, hdr, hlen, data, dlen);
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}
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static void qcom_glink_tx_kick(struct qcom_glink *glink)
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{
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glink->tx_pipe->kick(glink->tx_pipe);
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}
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static void qcom_glink_send_read_notify(struct qcom_glink *glink)
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{
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struct glink_msg msg;
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msg.cmd = cpu_to_le16(GLINK_CMD_READ_NOTIF);
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msg.param1 = 0;
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msg.param2 = 0;
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qcom_glink_tx_write(glink, &msg, sizeof(msg), NULL, 0);
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qcom_glink_tx_kick(glink);
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}
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static int qcom_glink_tx(struct qcom_glink *glink,
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const void *hdr, size_t hlen,
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const void *data, size_t dlen, bool wait)
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{
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unsigned int tlen = hlen + dlen;
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unsigned long flags;
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int ret = 0;
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/* Reject packets that are too big */
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if (tlen >= glink->tx_pipe->length)
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return -EINVAL;
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spin_lock_irqsave(&glink->tx_lock, flags);
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if (glink->abort_tx) {
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ret = -EIO;
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goto out;
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}
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while (qcom_glink_tx_avail(glink) < tlen) {
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if (!wait) {
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ret = -EAGAIN;
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goto out;
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}
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if (glink->abort_tx) {
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ret = -EIO;
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goto out;
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}
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if (!glink->sent_read_notify) {
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glink->sent_read_notify = true;
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qcom_glink_send_read_notify(glink);
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}
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/* Wait without holding the tx_lock */
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spin_unlock_irqrestore(&glink->tx_lock, flags);
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wait_event_timeout(glink->tx_avail_notify,
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qcom_glink_tx_avail(glink) >= tlen, 10 * HZ);
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spin_lock_irqsave(&glink->tx_lock, flags);
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if (qcom_glink_tx_avail(glink) >= tlen)
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glink->sent_read_notify = false;
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}
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qcom_glink_tx_write(glink, hdr, hlen, data, dlen);
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qcom_glink_tx_kick(glink);
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out:
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spin_unlock_irqrestore(&glink->tx_lock, flags);
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return ret;
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}
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static int qcom_glink_send_version(struct qcom_glink *glink)
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{
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struct glink_msg msg;
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msg.cmd = cpu_to_le16(GLINK_CMD_VERSION);
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msg.param1 = cpu_to_le16(GLINK_VERSION_1);
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msg.param2 = cpu_to_le32(glink->features);
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return qcom_glink_tx(glink, &msg, sizeof(msg), NULL, 0, true);
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}
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static void qcom_glink_send_version_ack(struct qcom_glink *glink)
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{
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struct glink_msg msg;
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msg.cmd = cpu_to_le16(GLINK_CMD_VERSION_ACK);
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msg.param1 = cpu_to_le16(GLINK_VERSION_1);
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msg.param2 = cpu_to_le32(glink->features);
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qcom_glink_tx(glink, &msg, sizeof(msg), NULL, 0, true);
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}
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static void qcom_glink_send_open_ack(struct qcom_glink *glink,
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struct glink_channel *channel)
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{
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struct glink_msg msg;
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msg.cmd = cpu_to_le16(GLINK_CMD_OPEN_ACK);
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msg.param1 = cpu_to_le16(channel->rcid);
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msg.param2 = cpu_to_le32(0);
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qcom_glink_tx(glink, &msg, sizeof(msg), NULL, 0, true);
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}
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static void qcom_glink_handle_intent_req_ack(struct qcom_glink *glink,
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unsigned int cid, bool granted)
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{
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struct glink_channel *channel;
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unsigned long flags;
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spin_lock_irqsave(&glink->idr_lock, flags);
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channel = idr_find(&glink->rcids, cid);
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spin_unlock_irqrestore(&glink->idr_lock, flags);
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if (!channel) {
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dev_err(glink->dev, "unable to find channel\n");
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return;
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}
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WRITE_ONCE(channel->intent_req_result, granted);
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wake_up_all(&channel->intent_req_wq);
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}
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static void qcom_glink_intent_req_abort(struct glink_channel *channel)
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{
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WRITE_ONCE(channel->intent_req_result, 0);
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wake_up_all(&channel->intent_req_wq);
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}
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/**
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* qcom_glink_send_open_req() - send a GLINK_CMD_OPEN request to the remote
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* @glink: Ptr to the glink edge
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* @channel: Ptr to the channel that the open req is sent
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*
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* Allocates a local channel id and sends a GLINK_CMD_OPEN message to the remote.
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* Will return with refcount held, regardless of outcome.
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*
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* Return: 0 on success, negative errno otherwise.
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*/
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static int qcom_glink_send_open_req(struct qcom_glink *glink,
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struct glink_channel *channel)
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{
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struct {
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struct glink_msg msg;
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u8 name[GLINK_NAME_SIZE];
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} __packed req;
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int name_len = strlen(channel->name) + 1;
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int req_len = ALIGN(sizeof(req.msg) + name_len, 8);
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int ret;
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unsigned long flags;
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kref_get(&channel->refcount);
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spin_lock_irqsave(&glink->idr_lock, flags);
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ret = idr_alloc_cyclic(&glink->lcids, channel,
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RPM_GLINK_CID_MIN, RPM_GLINK_CID_MAX,
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GFP_ATOMIC);
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spin_unlock_irqrestore(&glink->idr_lock, flags);
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if (ret < 0)
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return ret;
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channel->lcid = ret;
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req.msg.cmd = cpu_to_le16(GLINK_CMD_OPEN);
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req.msg.param1 = cpu_to_le16(channel->lcid);
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req.msg.param2 = cpu_to_le32(name_len);
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strcpy(req.name, channel->name);
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ret = qcom_glink_tx(glink, &req, req_len, NULL, 0, true);
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if (ret)
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goto remove_idr;
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return 0;
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remove_idr:
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spin_lock_irqsave(&glink->idr_lock, flags);
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idr_remove(&glink->lcids, channel->lcid);
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channel->lcid = 0;
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spin_unlock_irqrestore(&glink->idr_lock, flags);
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return ret;
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}
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static void qcom_glink_send_close_req(struct qcom_glink *glink,
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struct glink_channel *channel)
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{
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struct glink_msg req;
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req.cmd = cpu_to_le16(GLINK_CMD_CLOSE);
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req.param1 = cpu_to_le16(channel->lcid);
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req.param2 = 0;
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qcom_glink_tx(glink, &req, sizeof(req), NULL, 0, true);
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}
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static void qcom_glink_send_close_ack(struct qcom_glink *glink,
|
|
unsigned int rcid)
|
|
{
|
|
struct glink_msg req;
|
|
|
|
req.cmd = cpu_to_le16(GLINK_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 ? GLINK_CMD_RX_DONE_W_REUSE : GLINK_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
|
|
* @version: remote version
|
|
* @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
|
|
* @version: remote version response
|
|
* @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(GLINK_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
|
|
* @intent: 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 {
|
|
__le16 id;
|
|
__le16 lcid;
|
|
__le32 count;
|
|
__le32 size;
|
|
__le32 liid;
|
|
} __packed;
|
|
struct command cmd;
|
|
|
|
cmd.id = cpu_to_le16(GLINK_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);
|
|
|
|
if (reuse) {
|
|
WRITE_ONCE(channel->intent_received, true);
|
|
wake_up_all(&channel->intent_req_wq);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* qcom_glink_handle_intent_req() - Receive a request for rx_intent
|
|
* from remote side
|
|
* @glink: Pointer to the transport interface
|
|
* @cid: 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(struct_size(dcmd, data, extra), GFP_ATOMIC);
|
|
if (!dcmd)
|
|
return -ENOMEM;
|
|
|
|
INIT_LIST_HEAD(&dcmd->node);
|
|
|
|
qcom_glink_rx_peek(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_peek(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;
|
|
}
|
|
|
|
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);
|
|
ret = -ENOENT;
|
|
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_peek(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 = struct_size(msg, intents, 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");
|
|
qcom_glink_rx_advance(glink, ALIGN(msglen, 8));
|
|
return;
|
|
}
|
|
|
|
msg = kmalloc(msglen, GFP_ATOMIC);
|
|
if (!msg)
|
|
return;
|
|
|
|
qcom_glink_rx_peek(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");
|
|
}
|
|
|
|
WRITE_ONCE(channel->intent_received, true);
|
|
wake_up_all(&channel->intent_req_wq);
|
|
|
|
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_all(&channel->open_ack);
|
|
|
|
return 0;
|
|
}
|
|
|
|
void qcom_glink_native_rx(struct qcom_glink *glink)
|
|
{
|
|
struct glink_msg msg;
|
|
unsigned int param1;
|
|
unsigned int param2;
|
|
unsigned int avail;
|
|
unsigned int cmd;
|
|
int ret = 0;
|
|
|
|
/* To wakeup any blocking writers */
|
|
wake_up_all(&glink->tx_avail_notify);
|
|
|
|
for (;;) {
|
|
avail = qcom_glink_rx_avail(glink);
|
|
if (avail < sizeof(msg))
|
|
break;
|
|
|
|
qcom_glink_rx_peek(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 GLINK_CMD_VERSION:
|
|
case GLINK_CMD_VERSION_ACK:
|
|
case GLINK_CMD_CLOSE:
|
|
case GLINK_CMD_CLOSE_ACK:
|
|
case GLINK_CMD_RX_INTENT_REQ:
|
|
ret = qcom_glink_rx_defer(glink, 0);
|
|
break;
|
|
case GLINK_CMD_OPEN_ACK:
|
|
ret = qcom_glink_rx_open_ack(glink, param1);
|
|
qcom_glink_rx_advance(glink, ALIGN(sizeof(msg), 8));
|
|
break;
|
|
case GLINK_CMD_OPEN:
|
|
ret = qcom_glink_rx_defer(glink, param2);
|
|
break;
|
|
case GLINK_CMD_TX_DATA:
|
|
case GLINK_CMD_TX_DATA_CONT:
|
|
ret = qcom_glink_rx_data(glink, avail);
|
|
break;
|
|
case GLINK_CMD_READ_NOTIF:
|
|
qcom_glink_rx_advance(glink, ALIGN(sizeof(msg), 8));
|
|
qcom_glink_tx_kick(glink);
|
|
break;
|
|
case GLINK_CMD_INTENT:
|
|
qcom_glink_handle_intent(glink, param1, param2, avail);
|
|
break;
|
|
case GLINK_CMD_RX_DONE:
|
|
qcom_glink_handle_rx_done(glink, param1, param2, false);
|
|
qcom_glink_rx_advance(glink, ALIGN(sizeof(msg), 8));
|
|
break;
|
|
case GLINK_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 GLINK_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;
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(qcom_glink_native_rx);
|
|
|
|
/* 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 device_node *np = rpdev->dev.of_node;
|
|
struct qcom_glink *glink = channel->glink;
|
|
struct glink_core_rx_intent *intent;
|
|
const struct property *prop = NULL;
|
|
__be32 defaults[] = { cpu_to_be32(SZ_1K), cpu_to_be32(5) };
|
|
int num_intents;
|
|
int num_groups = 1;
|
|
__be32 *val = defaults;
|
|
int size;
|
|
|
|
if (glink->intentless || !completion_done(&channel->open_ack))
|
|
return 0;
|
|
|
|
prop = of_find_property(np, "qcom,intents", NULL);
|
|
if (prop) {
|
|
val = prop->value;
|
|
num_groups = prop->length / sizeof(u32) / 2;
|
|
}
|
|
|
|
/* Channel is now open, advertise base set of intents */
|
|
while (num_groups--) {
|
|
size = be32_to_cpup(val++);
|
|
num_intents = be32_to_cpup(val++);
|
|
while (num_intents--) {
|
|
intent = qcom_glink_alloc_intent(glink, channel, size,
|
|
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);
|
|
|
|
WRITE_ONCE(channel->intent_req_result, -1);
|
|
WRITE_ONCE(channel->intent_received, false);
|
|
|
|
cmd.id = GLINK_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_event_timeout(channel->intent_req_wq,
|
|
READ_ONCE(channel->intent_req_result) >= 0 &&
|
|
READ_ONCE(channel->intent_received),
|
|
10 * HZ);
|
|
if (!ret) {
|
|
dev_err(glink->dev, "intent request timed out\n");
|
|
ret = -ETIMEDOUT;
|
|
} else {
|
|
ret = READ_ONCE(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;
|
|
int chunk_size = len;
|
|
size_t offset = 0;
|
|
|
|
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) {
|
|
if (!intent)
|
|
intent = tmp;
|
|
else if (intent->size > tmp->size)
|
|
intent = tmp;
|
|
if (intent->size == len)
|
|
break;
|
|
}
|
|
}
|
|
if (intent)
|
|
intent->in_use = true;
|
|
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;
|
|
}
|
|
|
|
while (offset < len) {
|
|
chunk_size = len - offset;
|
|
if (chunk_size > SZ_8K && wait)
|
|
chunk_size = SZ_8K;
|
|
|
|
req.msg.cmd = cpu_to_le16(offset == 0 ? GLINK_CMD_TX_DATA : GLINK_CMD_TX_DATA_CONT);
|
|
req.msg.param1 = cpu_to_le16(channel->lcid);
|
|
req.msg.param2 = cpu_to_le32(iid);
|
|
req.chunk_size = cpu_to_le32(chunk_size);
|
|
req.left_size = cpu_to_le32(len - offset - chunk_size);
|
|
|
|
ret = qcom_glink_tx(glink, &req, sizeof(req), data + offset, chunk_size, wait);
|
|
if (ret) {
|
|
/* Mark intent available if we failed */
|
|
if (intent)
|
|
intent->in_use = false;
|
|
return ret;
|
|
}
|
|
|
|
offset += chunk_size;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
static int qcom_glink_sendto(struct rpmsg_endpoint *ept, void *data, int len, u32 dst)
|
|
{
|
|
struct glink_channel *channel = to_glink_channel(ept);
|
|
|
|
return __qcom_glink_send(channel, data, len, true);
|
|
}
|
|
|
|
static int qcom_glink_trysendto(struct rpmsg_endpoint *ept, void *data, int len, u32 dst)
|
|
{
|
|
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,
|
|
.sendto = qcom_glink_sendto,
|
|
.trysend = qcom_glink_trysend,
|
|
.trysendto = qcom_glink_trysendto,
|
|
};
|
|
|
|
static void qcom_glink_rpdev_release(struct device *dev)
|
|
{
|
|
struct rpmsg_device *rpdev = to_rpmsg_device(dev);
|
|
|
|
kfree(rpdev->driver_override);
|
|
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_all(&channel->open_req);
|
|
|
|
if (create_device) {
|
|
rpdev = kzalloc(sizeof(*rpdev), GFP_KERNEL);
|
|
if (!rpdev) {
|
|
ret = -ENOMEM;
|
|
goto rcid_remove;
|
|
}
|
|
|
|
rpdev->ept = &channel->ept;
|
|
strscpy_pad(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) {
|
|
strscpy_pad(chinfo.name, channel->name, sizeof(chinfo.name));
|
|
chinfo.src = RPMSG_ADDR_ANY;
|
|
chinfo.dst = RPMSG_ADDR_ANY;
|
|
|
|
rpmsg_unregister_device(glink->dev, &chinfo);
|
|
}
|
|
channel->rpdev = NULL;
|
|
|
|
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 rpmsg_channel_info chinfo;
|
|
struct glink_channel *channel;
|
|
unsigned long flags;
|
|
|
|
/* To wakeup any blocking writers */
|
|
wake_up_all(&glink->tx_avail_notify);
|
|
|
|
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);
|
|
|
|
/* Decouple the potential rpdev from the channel */
|
|
if (channel->rpdev) {
|
|
strscpy(chinfo.name, channel->name, sizeof(chinfo.name));
|
|
chinfo.src = RPMSG_ADDR_ANY;
|
|
chinfo.dst = RPMSG_ADDR_ANY;
|
|
|
|
rpmsg_unregister_device(glink->dev, &chinfo);
|
|
}
|
|
channel->rpdev = NULL;
|
|
|
|
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 GLINK_CMD_VERSION:
|
|
qcom_glink_receive_version(glink, param1, param2);
|
|
break;
|
|
case GLINK_CMD_VERSION_ACK:
|
|
qcom_glink_receive_version_ack(glink, param1, param2);
|
|
break;
|
|
case GLINK_CMD_OPEN:
|
|
qcom_glink_rx_open(glink, param1, msg->data);
|
|
break;
|
|
case GLINK_CMD_CLOSE:
|
|
qcom_glink_rx_close(glink, param1);
|
|
break;
|
|
case GLINK_CMD_CLOSE_ACK:
|
|
qcom_glink_rx_close_ack(glink, param1);
|
|
break;
|
|
case GLINK_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);
|
|
}
|
|
|
|
static ssize_t rpmsg_name_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
int ret = 0;
|
|
const char *name;
|
|
|
|
ret = of_property_read_string(dev->of_node, "label", &name);
|
|
if (ret < 0)
|
|
name = dev->of_node->name;
|
|
|
|
return sysfs_emit(buf, "%s\n", name);
|
|
}
|
|
static DEVICE_ATTR_RO(rpmsg_name);
|
|
|
|
static struct attribute *qcom_glink_attrs[] = {
|
|
&dev_attr_rpmsg_name.attr,
|
|
NULL
|
|
};
|
|
ATTRIBUTE_GROUPS(qcom_glink);
|
|
|
|
static void qcom_glink_device_release(struct device *dev)
|
|
{
|
|
struct rpmsg_device *rpdev = to_rpmsg_device(dev);
|
|
struct glink_channel *channel = to_glink_channel(rpdev->ept);
|
|
|
|
/* Release qcom_glink_alloc_channel() reference */
|
|
kref_put(&channel->refcount, qcom_glink_channel_release);
|
|
kfree(rpdev->driver_override);
|
|
kfree(rpdev);
|
|
}
|
|
|
|
static int qcom_glink_create_chrdev(struct qcom_glink *glink)
|
|
{
|
|
struct rpmsg_device *rpdev;
|
|
struct glink_channel *channel;
|
|
|
|
rpdev = kzalloc(sizeof(*rpdev), GFP_KERNEL);
|
|
if (!rpdev)
|
|
return -ENOMEM;
|
|
|
|
channel = qcom_glink_alloc_channel(glink, "rpmsg_chrdev");
|
|
if (IS_ERR(channel)) {
|
|
kfree(rpdev);
|
|
return PTR_ERR(channel);
|
|
}
|
|
channel->rpdev = rpdev;
|
|
|
|
rpdev->ept = &channel->ept;
|
|
rpdev->ops = &glink_device_ops;
|
|
rpdev->dev.parent = glink->dev;
|
|
rpdev->dev.release = qcom_glink_device_release;
|
|
|
|
return rpmsg_ctrldev_register_device(rpdev);
|
|
}
|
|
|
|
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 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;
|
|
|
|
spin_lock_init(&glink->tx_lock);
|
|
spin_lock_init(&glink->rx_lock);
|
|
INIT_LIST_HEAD(&glink->rx_queue);
|
|
INIT_WORK(&glink->rx_work, qcom_glink_work);
|
|
init_waitqueue_head(&glink->tx_avail_notify);
|
|
|
|
spin_lock_init(&glink->idr_lock);
|
|
idr_init(&glink->lcids);
|
|
idr_init(&glink->rcids);
|
|
|
|
glink->dev->groups = qcom_glink_groups;
|
|
|
|
ret = device_add_groups(dev, qcom_glink_groups);
|
|
if (ret)
|
|
dev_err(dev, "failed to add groups\n");
|
|
|
|
ret = qcom_glink_send_version(glink);
|
|
if (ret)
|
|
return ERR_PTR(ret);
|
|
|
|
ret = qcom_glink_create_chrdev(glink);
|
|
if (ret)
|
|
dev_err(glink->dev, "failed to register chrdev\n");
|
|
|
|
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;
|
|
unsigned long flags;
|
|
int cid;
|
|
int ret;
|
|
|
|
qcom_glink_cancel_rx_work(glink);
|
|
|
|
/* Fail all attempts at sending messages */
|
|
spin_lock_irqsave(&glink->tx_lock, flags);
|
|
glink->abort_tx = true;
|
|
wake_up_all(&glink->tx_avail_notify);
|
|
spin_unlock_irqrestore(&glink->tx_lock, flags);
|
|
|
|
/* Abort any senders waiting for intent requests */
|
|
spin_lock_irqsave(&glink->idr_lock, flags);
|
|
idr_for_each_entry(&glink->lcids, channel, cid)
|
|
qcom_glink_intent_req_abort(channel);
|
|
spin_unlock_irqrestore(&glink->idr_lock, flags);
|
|
|
|
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);
|
|
}
|
|
EXPORT_SYMBOL_GPL(qcom_glink_native_remove);
|
|
|
|
MODULE_DESCRIPTION("Qualcomm GLINK driver");
|
|
MODULE_LICENSE("GPL v2");
|