1
0
mirror of https://github.com/torvalds/linux.git synced 2024-12-29 14:21:47 +00:00
linux/drivers/rpmsg/qcom_glink_native.c
Chris Lew f0beb4ba9b rpmsg: glink: Remove chunk size word align warning
It is possible for the chunk sizes coming from the non RPM remote procs
to not be word aligned. Remove the alignment warning and continue to
read from the FIFO so execution is not stalled.

Signed-off-by: Chris Lew <clew@codeaurora.org>
Signed-off-by: Arun Kumar Neelakantam <aneela@codeaurora.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
2018-09-01 14:00:43 -07:00

1651 lines
40 KiB
C

// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2016-2017, Linaro Ltd
*/
#include <linux/idr.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/list.h>
#include <linux/mfd/syscon.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/rpmsg.h>
#include <linux/sizes.h>
#include <linux/slab.h>
#include <linux/workqueue.h>
#include <linux/mailbox_client.h>
#include "rpmsg_internal.h"
#include "qcom_glink_native.h"
#define GLINK_NAME_SIZE 32
#define GLINK_VERSION_1 1
#define RPM_GLINK_CID_MIN 1
#define RPM_GLINK_CID_MAX 65536
struct glink_msg {
__le16 cmd;
__le16 param1;
__le32 param2;
u8 data[];
} __packed;
/**
* struct glink_defer_cmd - deferred incoming control message
* @node: list node
* @msg: message header
* @data: payload of the message
*
* Copy of a received control message, to be added to @rx_queue and processed
* by @rx_work of @qcom_glink.
*/
struct glink_defer_cmd {
struct list_head node;
struct glink_msg msg;
u8 data[];
};
/**
* struct glink_core_rx_intent - RX intent
* RX intent
*
* @data: pointer to the data (may be NULL for zero-copy)
* @id: remote or local intent ID
* @size: size of the original intent (do not modify)
* @reuse: To mark if the intent can be reused after first use
* @in_use: To mark if intent is already in use for the channel
* @offset: next write offset (initially 0)
* @node: list node
*/
struct glink_core_rx_intent {
void *data;
u32 id;
size_t size;
bool reuse;
bool in_use;
u32 offset;
struct list_head node;
};
/**
* struct qcom_glink - driver context, relates to one remote subsystem
* @dev: reference to the associated struct device
* @mbox_client: mailbox client
* @mbox_chan: mailbox channel
* @rx_pipe: pipe object for receive FIFO
* @tx_pipe: pipe object for transmit FIFO
* @irq: IRQ for signaling incoming events
* @rx_work: worker for handling received control messages
* @rx_lock: protects the @rx_queue
* @rx_queue: queue of received control messages to be processed in @rx_work
* @tx_lock: synchronizes operations on the tx fifo
* @idr_lock: synchronizes @lcids and @rcids modifications
* @lcids: idr of all channels with a known local channel id
* @rcids: idr of all channels with a known remote channel id
* @features: remote features
* @intentless: flag to indicate that there is no intent
*/
struct qcom_glink {
struct device *dev;
const char *name;
struct mbox_client mbox_client;
struct mbox_chan *mbox_chan;
struct qcom_glink_pipe *rx_pipe;
struct qcom_glink_pipe *tx_pipe;
int irq;
struct work_struct rx_work;
spinlock_t rx_lock;
struct list_head rx_queue;
spinlock_t tx_lock;
spinlock_t idr_lock;
struct idr lcids;
struct idr rcids;
unsigned long features;
bool intentless;
};
enum {
GLINK_STATE_CLOSED,
GLINK_STATE_OPENING,
GLINK_STATE_OPEN,
GLINK_STATE_CLOSING,
};
/**
* struct glink_channel - internal representation of a channel
* @rpdev: rpdev reference, only used for primary endpoints
* @ept: rpmsg endpoint this channel is associated with
* @glink: qcom_glink context handle
* @refcount: refcount for the channel object
* @recv_lock: guard for @ept.cb
* @name: unique channel name/identifier
* @lcid: channel id, in local space
* @rcid: channel id, in remote space
* @intent_lock: lock for protection of @liids, @riids
* @liids: idr of all local intents
* @riids: idr of all remote intents
* @intent_work: worker responsible for transmitting rx_done packets
* @done_intents: list of intents that needs to be announced rx_done
* @buf: receive buffer, for gathering fragments
* @buf_offset: write offset in @buf
* @buf_size: size of current @buf
* @open_ack: completed once remote has acked the open-request
* @open_req: completed once open-request has been received
* @intent_req_lock: Synchronises multiple intent requests
* @intent_req_result: Result of intent request
* @intent_req_comp: Completion for intent_req signalling
*/
struct glink_channel {
struct rpmsg_endpoint ept;
struct rpmsg_device *rpdev;
struct qcom_glink *glink;
struct kref refcount;
spinlock_t recv_lock;
char *name;
unsigned int lcid;
unsigned int rcid;
spinlock_t intent_lock;
struct idr liids;
struct idr riids;
struct work_struct intent_work;
struct list_head done_intents;
struct glink_core_rx_intent *buf;
int buf_offset;
int buf_size;
struct completion open_ack;
struct completion open_req;
struct mutex intent_req_lock;
bool intent_req_result;
struct completion intent_req_comp;
};
#define to_glink_channel(_ept) container_of(_ept, struct glink_channel, ept)
static const struct rpmsg_endpoint_ops glink_endpoint_ops;
#define RPM_CMD_VERSION 0
#define RPM_CMD_VERSION_ACK 1
#define RPM_CMD_OPEN 2
#define RPM_CMD_CLOSE 3
#define RPM_CMD_OPEN_ACK 4
#define RPM_CMD_INTENT 5
#define RPM_CMD_RX_DONE 6
#define RPM_CMD_RX_INTENT_REQ 7
#define RPM_CMD_RX_INTENT_REQ_ACK 8
#define RPM_CMD_TX_DATA 9
#define RPM_CMD_CLOSE_ACK 11
#define RPM_CMD_TX_DATA_CONT 12
#define RPM_CMD_READ_NOTIF 13
#define RPM_CMD_RX_DONE_W_REUSE 14
#define GLINK_FEATURE_INTENTLESS BIT(1)
static void qcom_glink_rx_done_work(struct work_struct *work);
static struct glink_channel *qcom_glink_alloc_channel(struct qcom_glink *glink,
const char *name)
{
struct glink_channel *channel;
channel = kzalloc(sizeof(*channel), GFP_KERNEL);
if (!channel)
return ERR_PTR(-ENOMEM);
/* Setup glink internal glink_channel data */
spin_lock_init(&channel->recv_lock);
spin_lock_init(&channel->intent_lock);
mutex_init(&channel->intent_req_lock);
channel->glink = glink;
channel->name = kstrdup(name, GFP_KERNEL);
init_completion(&channel->open_req);
init_completion(&channel->open_ack);
init_completion(&channel->intent_req_comp);
INIT_LIST_HEAD(&channel->done_intents);
INIT_WORK(&channel->intent_work, qcom_glink_rx_done_work);
idr_init(&channel->liids);
idr_init(&channel->riids);
kref_init(&channel->refcount);
return channel;
}
static void qcom_glink_channel_release(struct kref *ref)
{
struct glink_channel *channel = container_of(ref, struct glink_channel,
refcount);
unsigned long flags;
spin_lock_irqsave(&channel->intent_lock, flags);
idr_destroy(&channel->liids);
idr_destroy(&channel->riids);
spin_unlock_irqrestore(&channel->intent_lock, flags);
kfree(channel->name);
kfree(channel);
}
static size_t qcom_glink_rx_avail(struct qcom_glink *glink)
{
return glink->rx_pipe->avail(glink->rx_pipe);
}
static void qcom_glink_rx_peak(struct qcom_glink *glink,
void *data, unsigned int offset, size_t count)
{
glink->rx_pipe->peak(glink->rx_pipe, data, offset, count);
}
static void qcom_glink_rx_advance(struct qcom_glink *glink, size_t count)
{
glink->rx_pipe->advance(glink->rx_pipe, count);
}
static size_t qcom_glink_tx_avail(struct qcom_glink *glink)
{
return glink->tx_pipe->avail(glink->tx_pipe);
}
static void qcom_glink_tx_write(struct qcom_glink *glink,
const void *hdr, size_t hlen,
const void *data, size_t dlen)
{
glink->tx_pipe->write(glink->tx_pipe, hdr, hlen, data, dlen);
}
static int qcom_glink_tx(struct qcom_glink *glink,
const void *hdr, size_t hlen,
const void *data, size_t dlen, bool wait)
{
unsigned int tlen = hlen + dlen;
unsigned long flags;
int ret = 0;
/* Reject packets that are too big */
if (tlen >= glink->tx_pipe->length)
return -EINVAL;
spin_lock_irqsave(&glink->tx_lock, flags);
while (qcom_glink_tx_avail(glink) < tlen) {
if (!wait) {
ret = -EAGAIN;
goto out;
}
/* Wait without holding the tx_lock */
spin_unlock_irqrestore(&glink->tx_lock, flags);
usleep_range(10000, 15000);
spin_lock_irqsave(&glink->tx_lock, flags);
}
qcom_glink_tx_write(glink, hdr, hlen, data, dlen);
mbox_send_message(glink->mbox_chan, NULL);
mbox_client_txdone(glink->mbox_chan, 0);
out:
spin_unlock_irqrestore(&glink->tx_lock, flags);
return ret;
}
static int qcom_glink_send_version(struct qcom_glink *glink)
{
struct glink_msg msg;
msg.cmd = cpu_to_le16(RPM_CMD_VERSION);
msg.param1 = cpu_to_le16(GLINK_VERSION_1);
msg.param2 = cpu_to_le32(glink->features);
return qcom_glink_tx(glink, &msg, sizeof(msg), NULL, 0, true);
}
static void qcom_glink_send_version_ack(struct qcom_glink *glink)
{
struct glink_msg msg;
msg.cmd = cpu_to_le16(RPM_CMD_VERSION_ACK);
msg.param1 = cpu_to_le16(GLINK_VERSION_1);
msg.param2 = cpu_to_le32(glink->features);
qcom_glink_tx(glink, &msg, sizeof(msg), NULL, 0, true);
}
static void qcom_glink_send_open_ack(struct qcom_glink *glink,
struct glink_channel *channel)
{
struct glink_msg msg;
msg.cmd = cpu_to_le16(RPM_CMD_OPEN_ACK);
msg.param1 = cpu_to_le16(channel->rcid);
msg.param2 = cpu_to_le32(0);
qcom_glink_tx(glink, &msg, sizeof(msg), NULL, 0, true);
}
static void qcom_glink_handle_intent_req_ack(struct qcom_glink *glink,
unsigned int cid, bool granted)
{
struct glink_channel *channel;
unsigned long flags;
spin_lock_irqsave(&glink->idr_lock, flags);
channel = idr_find(&glink->rcids, cid);
spin_unlock_irqrestore(&glink->idr_lock, flags);
if (!channel) {
dev_err(glink->dev, "unable to find channel\n");
return;
}
channel->intent_req_result = granted;
complete(&channel->intent_req_comp);
}
/**
* qcom_glink_send_open_req() - send a RPM_CMD_OPEN request to the remote
* @glink: Ptr to the glink edge
* @channel: Ptr to the channel that the open req is sent
*
* Allocates a local channel id and sends a RPM_CMD_OPEN message to the remote.
* Will return with refcount held, regardless of outcome.
*
* Returns 0 on success, negative errno otherwise.
*/
static int qcom_glink_send_open_req(struct qcom_glink *glink,
struct glink_channel *channel)
{
struct {
struct glink_msg msg;
u8 name[GLINK_NAME_SIZE];
} __packed req;
int name_len = strlen(channel->name) + 1;
int req_len = ALIGN(sizeof(req.msg) + name_len, 8);
int ret;
unsigned long flags;
kref_get(&channel->refcount);
spin_lock_irqsave(&glink->idr_lock, flags);
ret = idr_alloc_cyclic(&glink->lcids, channel,
RPM_GLINK_CID_MIN, RPM_GLINK_CID_MAX,
GFP_ATOMIC);
spin_unlock_irqrestore(&glink->idr_lock, flags);
if (ret < 0)
return ret;
channel->lcid = ret;
req.msg.cmd = cpu_to_le16(RPM_CMD_OPEN);
req.msg.param1 = cpu_to_le16(channel->lcid);
req.msg.param2 = cpu_to_le32(name_len);
strcpy(req.name, channel->name);
ret = qcom_glink_tx(glink, &req, req_len, NULL, 0, true);
if (ret)
goto remove_idr;
return 0;
remove_idr:
spin_lock_irqsave(&glink->idr_lock, flags);
idr_remove(&glink->lcids, channel->lcid);
channel->lcid = 0;
spin_unlock_irqrestore(&glink->idr_lock, flags);
return ret;
}
static void qcom_glink_send_close_req(struct qcom_glink *glink,
struct glink_channel *channel)
{
struct glink_msg req;
req.cmd = cpu_to_le16(RPM_CMD_CLOSE);
req.param1 = cpu_to_le16(channel->lcid);
req.param2 = 0;
qcom_glink_tx(glink, &req, sizeof(req), NULL, 0, true);
}
static void qcom_glink_send_close_ack(struct qcom_glink *glink,
unsigned int rcid)
{
struct glink_msg req;
req.cmd = cpu_to_le16(RPM_CMD_CLOSE_ACK);
req.param1 = cpu_to_le16(rcid);
req.param2 = 0;
qcom_glink_tx(glink, &req, sizeof(req), NULL, 0, true);
}
static void qcom_glink_rx_done_work(struct work_struct *work)
{
struct glink_channel *channel = container_of(work, struct glink_channel,
intent_work);
struct qcom_glink *glink = channel->glink;
struct glink_core_rx_intent *intent, *tmp;
struct {
u16 id;
u16 lcid;
u32 liid;
} __packed cmd;
unsigned int cid = channel->lcid;
unsigned int iid;
bool reuse;
unsigned long flags;
spin_lock_irqsave(&channel->intent_lock, flags);
list_for_each_entry_safe(intent, tmp, &channel->done_intents, node) {
list_del(&intent->node);
spin_unlock_irqrestore(&channel->intent_lock, flags);
iid = intent->id;
reuse = intent->reuse;
cmd.id = reuse ? RPM_CMD_RX_DONE_W_REUSE : RPM_CMD_RX_DONE;
cmd.lcid = cid;
cmd.liid = iid;
qcom_glink_tx(glink, &cmd, sizeof(cmd), NULL, 0, true);
if (!reuse) {
kfree(intent->data);
kfree(intent);
}
spin_lock_irqsave(&channel->intent_lock, flags);
}
spin_unlock_irqrestore(&channel->intent_lock, flags);
}
static void qcom_glink_rx_done(struct qcom_glink *glink,
struct glink_channel *channel,
struct glink_core_rx_intent *intent)
{
/* We don't send RX_DONE to intentless systems */
if (glink->intentless) {
kfree(intent->data);
kfree(intent);
return;
}
/* Take it off the tree of receive intents */
if (!intent->reuse) {
spin_lock(&channel->intent_lock);
idr_remove(&channel->liids, intent->id);
spin_unlock(&channel->intent_lock);
}
/* Schedule the sending of a rx_done indication */
spin_lock(&channel->intent_lock);
list_add_tail(&intent->node, &channel->done_intents);
spin_unlock(&channel->intent_lock);
schedule_work(&channel->intent_work);
}
/**
* qcom_glink_receive_version() - receive version/features from remote system
*
* @glink: pointer to transport interface
* @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(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);
goto advance_rx;
}
}
if (intent->size - intent->offset < chunk_size) {
dev_err(glink->dev, "Insufficient space in intent\n");
/* The packet header lied, drop payload */
goto advance_rx;
}
qcom_glink_rx_peak(glink, intent->data + intent->offset,
sizeof(hdr), chunk_size);
intent->offset += chunk_size;
/* Handle message when no fragments remain to be received */
if (!left_size) {
spin_lock(&channel->recv_lock);
if (channel->ept.cb) {
channel->ept.cb(channel->ept.rpdev,
intent->data,
intent->offset,
channel->ept.priv,
RPMSG_ADDR_ANY);
}
spin_unlock(&channel->recv_lock);
intent->offset = 0;
channel->buf = NULL;
qcom_glink_rx_done(glink, channel, intent);
}
advance_rx:
qcom_glink_rx_advance(glink, ALIGN(sizeof(hdr) + chunk_size, 8));
return ret;
}
static void qcom_glink_handle_intent(struct qcom_glink *glink,
unsigned int cid,
unsigned int count,
size_t avail)
{
struct glink_core_rx_intent *intent;
struct glink_channel *channel;
struct intent_pair {
__le32 size;
__le32 iid;
};
struct {
struct glink_msg msg;
struct intent_pair intents[];
} __packed * msg;
const size_t msglen = sizeof(*msg) + sizeof(struct intent_pair) * count;
int ret;
int i;
unsigned long flags;
if (avail < msglen) {
dev_dbg(glink->dev, "Not enough data in fifo\n");
return;
}
spin_lock_irqsave(&glink->idr_lock, flags);
channel = idr_find(&glink->rcids, cid);
spin_unlock_irqrestore(&glink->idr_lock, flags);
if (!channel) {
dev_err(glink->dev, "intents for non-existing channel\n");
return;
}
msg = kmalloc(msglen, GFP_ATOMIC);
if (!msg)
return;
qcom_glink_rx_peak(glink, msg, 0, msglen);
for (i = 0; i < count; ++i) {
intent = kzalloc(sizeof(*intent), GFP_ATOMIC);
if (!intent)
break;
intent->id = le32_to_cpu(msg->intents[i].iid);
intent->size = le32_to_cpu(msg->intents[i].size);
spin_lock_irqsave(&channel->intent_lock, flags);
ret = idr_alloc(&channel->riids, intent,
intent->id, intent->id + 1, GFP_ATOMIC);
spin_unlock_irqrestore(&channel->intent_lock, flags);
if (ret < 0)
dev_err(glink->dev, "failed to store remote intent\n");
}
kfree(msg);
qcom_glink_rx_advance(glink, ALIGN(msglen, 8));
}
static int qcom_glink_rx_open_ack(struct qcom_glink *glink, unsigned int lcid)
{
struct glink_channel *channel;
spin_lock(&glink->idr_lock);
channel = idr_find(&glink->lcids, lcid);
spin_unlock(&glink->idr_lock);
if (!channel) {
dev_err(glink->dev, "Invalid open ack packet\n");
return -EINVAL;
}
complete(&channel->open_ack);
return 0;
}
static irqreturn_t qcom_glink_native_intr(int irq, void *data)
{
struct qcom_glink *glink = data;
struct glink_msg msg;
unsigned int param1;
unsigned int param2;
unsigned int avail;
unsigned int cmd;
int ret = 0;
for (;;) {
avail = qcom_glink_rx_avail(glink);
if (avail < sizeof(msg))
break;
qcom_glink_rx_peak(glink, &msg, 0, sizeof(msg));
cmd = le16_to_cpu(msg.cmd);
param1 = le16_to_cpu(msg.param1);
param2 = le32_to_cpu(msg.param2);
switch (cmd) {
case RPM_CMD_VERSION:
case RPM_CMD_VERSION_ACK:
case RPM_CMD_CLOSE:
case RPM_CMD_CLOSE_ACK:
case RPM_CMD_RX_INTENT_REQ:
ret = qcom_glink_rx_defer(glink, 0);
break;
case RPM_CMD_OPEN_ACK:
ret = qcom_glink_rx_open_ack(glink, param1);
qcom_glink_rx_advance(glink, ALIGN(sizeof(msg), 8));
break;
case RPM_CMD_OPEN:
ret = qcom_glink_rx_defer(glink, param2);
break;
case RPM_CMD_TX_DATA:
case RPM_CMD_TX_DATA_CONT:
ret = qcom_glink_rx_data(glink, avail);
break;
case RPM_CMD_READ_NOTIF:
qcom_glink_rx_advance(glink, ALIGN(sizeof(msg), 8));
mbox_send_message(glink->mbox_chan, NULL);
mbox_client_txdone(glink->mbox_chan, 0);
break;
case RPM_CMD_INTENT:
qcom_glink_handle_intent(glink, param1, param2, avail);
break;
case RPM_CMD_RX_DONE:
qcom_glink_handle_rx_done(glink, param1, param2, false);
qcom_glink_rx_advance(glink, ALIGN(sizeof(msg), 8));
break;
case RPM_CMD_RX_DONE_W_REUSE:
qcom_glink_handle_rx_done(glink, param1, param2, true);
qcom_glink_rx_advance(glink, ALIGN(sizeof(msg), 8));
break;
case RPM_CMD_RX_INTENT_REQ_ACK:
qcom_glink_handle_intent_req_ack(glink, param1, param2);
qcom_glink_rx_advance(glink, ALIGN(sizeof(msg), 8));
break;
default:
dev_err(glink->dev, "unhandled rx cmd: %d\n", cmd);
ret = -EINVAL;
break;
}
if (ret)
break;
}
return IRQ_HANDLED;
}
/* Locally initiated rpmsg_create_ept */
static struct glink_channel *qcom_glink_create_local(struct qcom_glink *glink,
const char *name)
{
struct glink_channel *channel;
int ret;
unsigned long flags;
channel = qcom_glink_alloc_channel(glink, name);
if (IS_ERR(channel))
return ERR_CAST(channel);
ret = qcom_glink_send_open_req(glink, channel);
if (ret)
goto release_channel;
ret = wait_for_completion_timeout(&channel->open_ack, 5 * HZ);
if (!ret)
goto err_timeout;
ret = wait_for_completion_timeout(&channel->open_req, 5 * HZ);
if (!ret)
goto err_timeout;
qcom_glink_send_open_ack(glink, channel);
return channel;
err_timeout:
/* qcom_glink_send_open_req() did register the channel in lcids*/
spin_lock_irqsave(&glink->idr_lock, flags);
idr_remove(&glink->lcids, channel->lcid);
spin_unlock_irqrestore(&glink->idr_lock, flags);
release_channel:
/* Release qcom_glink_send_open_req() reference */
kref_put(&channel->refcount, qcom_glink_channel_release);
/* Release qcom_glink_alloc_channel() reference */
kref_put(&channel->refcount, qcom_glink_channel_release);
return ERR_PTR(-ETIMEDOUT);
}
/* Remote initiated rpmsg_create_ept */
static int qcom_glink_create_remote(struct qcom_glink *glink,
struct glink_channel *channel)
{
int ret;
qcom_glink_send_open_ack(glink, channel);
ret = qcom_glink_send_open_req(glink, channel);
if (ret)
goto close_link;
ret = wait_for_completion_timeout(&channel->open_ack, 5 * HZ);
if (!ret) {
ret = -ETIMEDOUT;
goto close_link;
}
return 0;
close_link:
/*
* Send a close request to "undo" our open-ack. The close-ack will
* release the last reference.
*/
qcom_glink_send_close_req(glink, channel);
/* Release qcom_glink_send_open_req() reference */
kref_put(&channel->refcount, qcom_glink_channel_release);
return ret;
}
static struct rpmsg_endpoint *qcom_glink_create_ept(struct rpmsg_device *rpdev,
rpmsg_rx_cb_t cb,
void *priv,
struct rpmsg_channel_info
chinfo)
{
struct glink_channel *parent = to_glink_channel(rpdev->ept);
struct glink_channel *channel;
struct qcom_glink *glink = parent->glink;
struct rpmsg_endpoint *ept;
const char *name = chinfo.name;
int cid;
int ret;
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)
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(&channel->open_req);
if (create_device) {
rpdev = kzalloc(sizeof(*rpdev), GFP_KERNEL);
if (!rpdev) {
ret = -ENOMEM;
goto rcid_remove;
}
rpdev->ept = &channel->ept;
strncpy(rpdev->id.name, name, RPMSG_NAME_SIZE);
rpdev->src = RPMSG_ADDR_ANY;
rpdev->dst = RPMSG_ADDR_ANY;
rpdev->ops = &glink_device_ops;
node = qcom_glink_match_channel(glink->dev->of_node, name);
rpdev->dev.of_node = node;
rpdev->dev.parent = glink->dev;
rpdev->dev.release = qcom_glink_rpdev_release;
ret = rpmsg_register_device(rpdev);
if (ret)
goto free_rpdev;
channel->rpdev = rpdev;
}
return 0;
free_rpdev:
kfree(rpdev);
rcid_remove:
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);
}
}
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);
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);
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;
unsigned long flags;
disable_irq(glink->irq);
cancel_work_sync(&glink->rx_work);
ret = device_for_each_child(glink->dev, NULL, qcom_glink_remove_device);
if (ret)
dev_warn(glink->dev, "Can't remove GLINK devices: %d\n", ret);
spin_lock_irqsave(&glink->idr_lock, flags);
/* Release any defunct local channels, waiting for close-ack */
idr_for_each_entry(&glink->lcids, channel, cid)
kref_put(&channel->refcount, qcom_glink_channel_release);
idr_destroy(&glink->lcids);
idr_destroy(&glink->rcids);
spin_unlock_irqrestore(&glink->idr_lock, flags);
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");