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1746 lines
42 KiB
1746 lines
42 KiB
// 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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|
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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/of_irq.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/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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* @mbox_client: mailbox client |
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* @mbox_chan: mailbox channel |
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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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* @irq: IRQ for signaling incoming events |
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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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*/ |
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struct qcom_glink { |
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struct device *dev; |
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const char *name; |
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struct mbox_client mbox_client; |
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struct mbox_chan *mbox_chan; |
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struct qcom_glink_pipe *rx_pipe; |
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struct qcom_glink_pipe *tx_pipe; |
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int irq; |
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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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}; |
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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_req_comp: Completion 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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bool intent_req_result; |
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struct completion intent_req_comp; |
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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 RPM_CMD_VERSION 0 |
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#define RPM_CMD_VERSION_ACK 1 |
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#define RPM_CMD_OPEN 2 |
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#define RPM_CMD_CLOSE 3 |
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#define RPM_CMD_OPEN_ACK 4 |
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#define RPM_CMD_INTENT 5 |
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#define RPM_CMD_RX_DONE 6 |
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#define RPM_CMD_RX_INTENT_REQ 7 |
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#define RPM_CMD_RX_INTENT_REQ_ACK 8 |
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#define RPM_CMD_TX_DATA 9 |
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#define RPM_CMD_CLOSE_ACK 11 |
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#define RPM_CMD_TX_DATA_CONT 12 |
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#define RPM_CMD_READ_NOTIF 13 |
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#define RPM_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_completion(&channel->intent_req_comp); |
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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_peak(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->peak(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 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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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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/* Wait without holding the tx_lock */ |
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spin_unlock_irqrestore(&glink->tx_lock, flags); |
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usleep_range(10000, 15000); |
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spin_lock_irqsave(&glink->tx_lock, flags); |
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} |
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qcom_glink_tx_write(glink, hdr, hlen, data, dlen); |
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mbox_send_message(glink->mbox_chan, NULL); |
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mbox_client_txdone(glink->mbox_chan, 0); |
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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(RPM_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(RPM_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(RPM_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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channel->intent_req_result = granted; |
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complete(&channel->intent_req_comp); |
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} |
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/** |
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* qcom_glink_send_open_req() - send a RPM_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 RPM_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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* Returns 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(RPM_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(RPM_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, |
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unsigned int rcid) |
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{ |
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struct glink_msg req; |
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req.cmd = cpu_to_le16(RPM_CMD_CLOSE_ACK); |
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req.param1 = cpu_to_le16(rcid); |
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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_rx_done_work(struct work_struct *work) |
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{ |
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struct glink_channel *channel = container_of(work, struct glink_channel, |
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intent_work); |
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struct qcom_glink *glink = channel->glink; |
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struct glink_core_rx_intent *intent, *tmp; |
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struct { |
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u16 id; |
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u16 lcid; |
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u32 liid; |
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} __packed cmd; |
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unsigned int cid = channel->lcid; |
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unsigned int iid; |
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bool reuse; |
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unsigned long flags; |
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|
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spin_lock_irqsave(&channel->intent_lock, flags); |
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list_for_each_entry_safe(intent, tmp, &channel->done_intents, node) { |
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list_del(&intent->node); |
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spin_unlock_irqrestore(&channel->intent_lock, flags); |
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iid = intent->id; |
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reuse = intent->reuse; |
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|
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cmd.id = reuse ? RPM_CMD_RX_DONE_W_REUSE : RPM_CMD_RX_DONE; |
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cmd.lcid = cid; |
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cmd.liid = iid; |
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|
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qcom_glink_tx(glink, &cmd, sizeof(cmd), NULL, 0, true); |
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if (!reuse) { |
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kfree(intent->data); |
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kfree(intent); |
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} |
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spin_lock_irqsave(&channel->intent_lock, flags); |
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} |
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spin_unlock_irqrestore(&channel->intent_lock, flags); |
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} |
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static void qcom_glink_rx_done(struct qcom_glink *glink, |
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struct glink_channel *channel, |
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struct glink_core_rx_intent *intent) |
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{ |
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/* We don't send RX_DONE to intentless systems */ |
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if (glink->intentless) { |
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kfree(intent->data); |
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kfree(intent); |
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return; |
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} |
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|
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/* Take it off the tree of receive intents */ |
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if (!intent->reuse) { |
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spin_lock(&channel->intent_lock); |
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idr_remove(&channel->liids, intent->id); |
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spin_unlock(&channel->intent_lock); |
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} |
|
|
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/* Schedule the sending of a rx_done indication */ |
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spin_lock(&channel->intent_lock); |
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list_add_tail(&intent->node, &channel->done_intents); |
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spin_unlock(&channel->intent_lock); |
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|
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schedule_work(&channel->intent_work); |
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} |
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|
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/** |
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* qcom_glink_receive_version() - receive version/features from remote system |
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* |
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* @glink: pointer to transport interface |
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* @version: remote version |
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* @features: remote features |
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* |
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* This function is called in response to a remote-initiated version/feature |
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* negotiation sequence. |
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*/ |
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static void qcom_glink_receive_version(struct qcom_glink *glink, |
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u32 version, |
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u32 features) |
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{ |
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switch (version) { |
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case 0: |
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break; |
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case GLINK_VERSION_1: |
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glink->features &= features; |
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fallthrough; |
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default: |
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qcom_glink_send_version_ack(glink); |
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break; |
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} |
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} |
|
|
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/** |
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* qcom_glink_receive_version_ack() - receive negotiation ack from remote system |
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* |
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* @glink: pointer to transport interface |
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* @version: remote version response |
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* @features: remote features response |
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* |
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* This function is called in response to a local-initiated version/feature |
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* negotiation sequence and is the counter-offer from the remote side based |
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* upon the initial version and feature set requested. |
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*/ |
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static void qcom_glink_receive_version_ack(struct qcom_glink *glink, |
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u32 version, |
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u32 features) |
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{ |
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switch (version) { |
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case 0: |
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/* Version negotiation failed */ |
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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 |
|
* @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(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 |
|
* @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(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; |
|
} |
|
|
|
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_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 = 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"); |
|
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_all(&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 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); |
|
|
|
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) { |
|
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; |
|
} |
|
|
|
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_all(&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); |
|
} |
|
|
|
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 snprintf(buf, RPMSG_NAME_SIZE, "%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); |
|
} |
|
|
|
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_chrdev_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 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; |
|
|
|
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); |
|
|
|
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 = of_property_read_string(dev->of_node, "label", &glink->name); |
|
if (ret < 0) |
|
glink->name = dev->of_node->name; |
|
|
|
glink->mbox_client.dev = dev; |
|
glink->mbox_client.knows_txdone = true; |
|
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); |
|
|
|
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; |
|
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");
|
|
|