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android_kernel_samsung_hero.../drivers/soc/qcom/glink_smd_xprt.c

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init: OSRC G9300ZCU2APF7
2016-08-17 10:41:52 +02:00
/* Copyright (c) 2014-2015, The Linux Foundation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
* only version 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/delay.h>
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/platform_device.h>
#include <linux/sizes.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/srcu.h>
#include <linux/termios.h>
#include <linux/workqueue.h>
#include <soc/qcom/smd.h>
#include <soc/qcom/glink.h>
#include "glink_core_if.h"
#include "glink_private.h"
#include "glink_xprt_if.h"
#define NUM_EDGES 5
#define XPRT_NAME "smd_trans"
#define SMD_DTR_SIG BIT(31)
#define SMD_CTS_SIG BIT(30)
#define SMD_CD_SIG BIT(29)
#define SMD_RI_SIG BIT(28)
/**
* enum command_types - commands send/received from remote system
* @CMD_OPEN: Channel open request
* @CMD_OPEN_ACK: Response to @CMD_OPEN
* @CMD_CLOSE: Channel close request
* @CMD_CLOSE_ACK: Response to @CMD_CLOSE
*/
enum command_types {
CMD_OPEN,
CMD_OPEN_ACK,
CMD_CLOSE,
CMD_CLOSE_ACK,
};
/*
* Max of 64 channels, the 128 offset puts the rcid out of the
* range the remote might use
*/
#define LEGACY_RCID_CHANNEL_OFFSET 128
#define SMDXPRT_ERR(einfo, x...) GLINK_XPRT_IF_ERR(einfo->xprt_if, x)
#define SMDXPRT_INFO(einfo, x...) GLINK_XPRT_IF_INFO(einfo->xprt_if, x)
#define SMDXPRT_DBG(einfo, x...) GLINK_XPRT_IF_DBG(einfo->xprt_if, x)
/**
* struct edge_info() - local information for managing an edge
* @xprt_if: The transport interface registered with the glink code
* associated with this edge.
* @xprt_cfg: The transport configuration for the glink core
* associated with this edge.
* @smd_edge: The smd edge value corresponding to this edge.
* @channels: A list of all the channels that currently exist on this
* edge.
* @channels_lock: Protects @channels "reads" from "writes".
* @intentless: Flag indicating this edge is intentless.
* @irq_disabled: Flag indicating whether interrupt is enabled or
* disabled.
* @ssr_sync: Synchronizes SSR with any ongoing activity that might
* conflict.
* @in_ssr: Prevents new activity that might conflict with an active
* SSR.
* @ssr_work: Ends SSR processing after giving SMD a chance to wrap up
* SSR.
* @smd_ch: Private SMD channel for channel migration.
* @smd_lock: Serializes write access to @smd_ch.
* @in_ssr_lock: Lock to protect the @in_ssr.
* @smd_ctl_ch_open: Indicates that @smd_ch is fully open.
* @work: Work item for processing migration data.
* @rx_cmd_lock: The transport interface lock to notify about received
* commands in a sequential manner.
*
* Each transport registered with the core is represented by a single instance
* of this structure which allows for complete management of the transport.
*/
struct edge_info {
struct glink_transport_if xprt_if;
struct glink_core_transport_cfg xprt_cfg;
uint32_t smd_edge;
struct list_head channels;
spinlock_t channels_lock;
bool intentless;
bool irq_disabled;
struct srcu_struct ssr_sync;
bool in_ssr;
struct delayed_work ssr_work;
smd_channel_t *smd_ch;
struct mutex smd_lock;
struct mutex in_ssr_lock;
bool smd_ctl_ch_open;
struct work_struct work;
struct mutex rx_cmd_lock;
};
/**
* struct channel() - local information for managing a channel
* @node: For chaining this channel on list for its edge.
* @name: The name of this channel.
* @lcid: The local channel id the core uses for this channel.
* @rcid: The true remote channel id for this channel.
* @ch_probe_lock: Lock to protect channel probe status.
* @wait_for_probe: This channel is waiting for a probe from SMD.
* @had_probed: This channel probed in the past and may skip probe.
* @edge: Handle to the edge_info this channel is associated with.
* @smd_ch: Handle to the underlying smd channel.
* @intents: List of active intents on this channel.
* @used_intents: List of consumed intents on this channel.
* @intents_lock: Lock to protect @intents and @used_intents.
* @next_intent_id: The next id to use for generated intents.
* @wq: Handle for running tasks.
* @work: Task to process received data.
* @cur_intent: The current intent for received data.
* @intent_req: Flag indicating if an intent has been requested for rx.
* @is_closing: Flag indicating this channel is currently in the closing
* state.
* @local_legacy: The local side of the channel is in legacy mode.
* @remote_legacy: The remote side of the channel is in legacy mode.
* @rx_data_lock: Used to serialize RX data processing.
* @streaming_ch: Indicates the underlying SMD channel is streaming type.
* @tx_resume_needed: Indicates whether a tx_resume call should be triggered.
*/
struct channel {
struct list_head node;
char name[GLINK_NAME_SIZE];
uint32_t lcid;
uint32_t rcid;
struct mutex ch_probe_lock;
bool wait_for_probe;
bool had_probed;
struct edge_info *edge;
smd_channel_t *smd_ch;
struct list_head intents;
struct list_head used_intents;
spinlock_t intents_lock;
uint32_t next_intent_id;
struct workqueue_struct *wq;
struct work_struct work;
struct intent_info *cur_intent;
bool intent_req;
bool is_closing;
bool local_legacy;
bool remote_legacy;
size_t intent_req_size;
spinlock_t rx_data_lock;
bool streaming_ch;
bool tx_resume_needed;
};
/**
* struct intent_info() - information for managing an intent
* @node: Used for putting this intent in a list for its channel.
* @llid: The local intent id the core uses to identify this intent.
* @size: The size of the intent in bytes.
*/
struct intent_info {
struct list_head node;
uint32_t liid;
size_t size;
};
/**
* struct channel_work() - a task to be processed for a specific channel
* @ch: The channel associated with this task.
* @iid: Intent id associated with this task, may not always be valid.
* @work: The task to be processed.
*/
struct channel_work {
struct channel *ch;
uint32_t iid;
struct work_struct work;
};
/**
* struct pdrvs - Tracks a platform driver and its use among channels
* @node: For tracking in the pdrv_list.
* @pdrv: The platform driver to track.
*/
struct pdrvs {
struct list_head node;
struct platform_driver pdrv;
};
static uint32_t negotiate_features_v1(struct glink_transport_if *if_ptr,
const struct glink_core_version *version,
uint32_t features);
static struct edge_info edge_infos[NUM_EDGES] = {
{
.xprt_cfg.edge = "dsps",
.smd_edge = SMD_APPS_DSPS,
},
{
.xprt_cfg.edge = "lpass",
.smd_edge = SMD_APPS_QDSP,
},
{
.xprt_cfg.edge = "mpss",
.smd_edge = SMD_APPS_MODEM,
},
{
.xprt_cfg.edge = "wcnss",
.smd_edge = SMD_APPS_WCNSS,
},
{
.xprt_cfg.edge = "rpm",
.smd_edge = SMD_APPS_RPM,
.intentless = true,
},
};
static struct glink_core_version versions[] = {
{1, 0x00, negotiate_features_v1},
};
static LIST_HEAD(pdrv_list);
static DEFINE_MUTEX(pdrv_list_mutex);
static void process_data_event(struct work_struct *work);
static int add_platform_driver(struct channel *ch);
static void smd_data_ch_close(struct channel *ch);
/**
* check_write_avail() - Check if there is space to to write on the smd channel,
* and enable the read interrupt if there is not.
* @check_fn: The function to use to check if there is space to write
* @ch: The channel to check
*
* Return: 0 on success or standard Linux error codes.
*/
static int check_write_avail(int (*check_fn)(smd_channel_t *),
struct channel *ch)
{
int rc = check_fn(ch->smd_ch);
if (rc == 0) {
ch->tx_resume_needed = true;
smd_enable_read_intr(ch->smd_ch);
rc = check_fn(ch->smd_ch);
if (rc > 0) {
ch->tx_resume_needed = false;
smd_disable_read_intr(ch->smd_ch);
}
}
return rc;
}
/**
* process_ctl_event() - process a control channel event task
* @work: The migration task to process.
*/
static void process_ctl_event(struct work_struct *work)
{
struct command {
uint32_t cmd;
uint32_t id;
uint32_t priority;
};
struct command cmd;
struct edge_info *einfo;
struct channel *ch;
struct channel *temp_ch;
int pkt_size;
int read_avail;
char name[GLINK_NAME_SIZE];
bool found;
unsigned long flags;
einfo = container_of(work, struct edge_info, work);
mutex_lock(&einfo->in_ssr_lock);
if (einfo->in_ssr) {
einfo->in_ssr = false;
einfo->xprt_if.glink_core_if_ptr->link_up(&einfo->xprt_if);
}
mutex_unlock(&einfo->in_ssr_lock);
while (smd_read_avail(einfo->smd_ch)) {
found = false;
pkt_size = smd_cur_packet_size(einfo->smd_ch);
read_avail = smd_read_avail(einfo->smd_ch);
if (pkt_size != read_avail)
continue;
smd_read(einfo->smd_ch, &cmd, sizeof(cmd));
if (cmd.cmd == CMD_OPEN) {
smd_read(einfo->smd_ch, name, GLINK_NAME_SIZE);
SMDXPRT_INFO(einfo, "%s RX OPEN '%s'\n",
__func__, name);
spin_lock_irqsave(&einfo->channels_lock, flags);
list_for_each_entry(ch, &einfo->channels, node) {
if (!strcmp(name, ch->name)) {
found = true;
break;
}
}
spin_unlock_irqrestore(&einfo->channels_lock, flags);
if (!found) {
ch = kzalloc(sizeof(*ch), GFP_KERNEL);
if (!ch) {
SMDXPRT_ERR(einfo,
"%s: ch alloc failed\n",
__func__);
continue;
}
strlcpy(ch->name, name, GLINK_NAME_SIZE);
ch->edge = einfo;
mutex_init(&ch->ch_probe_lock);
INIT_LIST_HEAD(&ch->intents);
INIT_LIST_HEAD(&ch->used_intents);
spin_lock_init(&ch->intents_lock);
spin_lock_init(&ch->rx_data_lock);
INIT_WORK(&ch->work, process_data_event);
ch->wq = create_singlethread_workqueue(
ch->name);
if (!ch->wq) {
SMDXPRT_ERR(einfo,
"%s: ch wq create failed\n",
__func__);
kfree(ch);
continue;
}
/*
* Channel could have been added to the list by
* someone else so scan again. Channel creation
* is non-atomic, so unlock and recheck is
* necessary
*/
temp_ch = ch;
spin_lock_irqsave(&einfo->channels_lock, flags);
list_for_each_entry(ch, &einfo->channels, node)
if (!strcmp(name, ch->name)) {
found = true;
break;
}
if (!found) {
ch = temp_ch;
list_add_tail(&ch->node,
&einfo->channels);
spin_unlock_irqrestore(
&einfo->channels_lock, flags);
} else {
spin_unlock_irqrestore(
&einfo->channels_lock, flags);
destroy_workqueue(temp_ch->wq);
kfree(temp_ch);
}
}
if (ch->remote_legacy) {
SMDXPRT_DBG(einfo, "%s SMD Remote Open '%s'\n",
__func__, name);
cmd.cmd = CMD_OPEN_ACK;
cmd.priority = SMD_TRANS_XPRT_ID;
mutex_lock(&einfo->smd_lock);
while (smd_write_avail(einfo->smd_ch) <
sizeof(cmd))
msleep(20);
smd_write(einfo->smd_ch, &cmd, sizeof(cmd));
mutex_unlock(&einfo->smd_lock);
continue;
} else {
SMDXPRT_DBG(einfo,
"%s G-Link Remote Open '%s'\n",
__func__, name);
}
ch->rcid = cmd.id;
mutex_lock(&einfo->rx_cmd_lock);
einfo->xprt_if.glink_core_if_ptr->rx_cmd_ch_remote_open(
&einfo->xprt_if,
cmd.id,
name,
cmd.priority);
mutex_unlock(&einfo->rx_cmd_lock);
} else if (cmd.cmd == CMD_OPEN_ACK) {
SMDXPRT_INFO(einfo,
"%s RX OPEN ACK lcid %u; xprt_req %u\n",
__func__, cmd.id, cmd.priority);
spin_lock_irqsave(&einfo->channels_lock, flags);
list_for_each_entry(ch, &einfo->channels, node)
if (cmd.id == ch->lcid) {
found = true;
break;
}
spin_unlock_irqrestore(&einfo->channels_lock, flags);
if (!found) {
SMDXPRT_ERR(einfo, "%s No channel match %u\n",
__func__, cmd.id);
continue;
}
add_platform_driver(ch);
mutex_lock(&einfo->rx_cmd_lock);
einfo->xprt_if.glink_core_if_ptr->rx_cmd_ch_open_ack(
&einfo->xprt_if,
cmd.id,
cmd.priority);
mutex_unlock(&einfo->rx_cmd_lock);
} else if (cmd.cmd == CMD_CLOSE) {
SMDXPRT_INFO(einfo, "%s RX REMOTE CLOSE rcid %u\n",
__func__, cmd.id);
spin_lock_irqsave(&einfo->channels_lock, flags);
list_for_each_entry(ch, &einfo->channels, node)
if (cmd.id == ch->rcid) {
found = true;
break;
}
spin_unlock_irqrestore(&einfo->channels_lock, flags);
if (!found)
SMDXPRT_ERR(einfo, "%s no matching rcid %u\n",
__func__, cmd.id);
if (found && !ch->remote_legacy) {
mutex_lock(&einfo->rx_cmd_lock);
einfo->xprt_if.glink_core_if_ptr->
rx_cmd_ch_remote_close(
&einfo->xprt_if,
cmd.id);
mutex_unlock(&einfo->rx_cmd_lock);
} else {
/* not found or a legacy channel */
SMDXPRT_INFO(einfo,
"%s Sim RX CLOSE ACK lcid %u\n",
__func__, cmd.id);
cmd.cmd = CMD_CLOSE_ACK;
mutex_lock(&einfo->smd_lock);
while (smd_write_avail(einfo->smd_ch) <
sizeof(cmd))
msleep(20);
smd_write(einfo->smd_ch, &cmd, sizeof(cmd));
mutex_unlock(&einfo->smd_lock);
}
} else if (cmd.cmd == CMD_CLOSE_ACK) {
int rcu_id;
SMDXPRT_INFO(einfo, "%s RX CLOSE ACK lcid %u\n",
__func__, cmd.id);
spin_lock_irqsave(&einfo->channels_lock, flags);
list_for_each_entry(ch, &einfo->channels, node) {
if (cmd.id == ch->lcid) {
found = true;
break;
}
}
spin_unlock_irqrestore(&einfo->channels_lock, flags);
if (!found) {
SMDXPRT_ERR(einfo, "%s LCID not found %u\n",
__func__, cmd.id);
continue;
}
rcu_id = srcu_read_lock(&einfo->ssr_sync);
smd_data_ch_close(ch);
srcu_read_unlock(&einfo->ssr_sync, rcu_id);
mutex_lock(&einfo->rx_cmd_lock);
einfo->xprt_if.glink_core_if_ptr->rx_cmd_ch_close_ack(
&einfo->xprt_if,
cmd.id);
mutex_unlock(&einfo->rx_cmd_lock);
}
}
}
/**
* ctl_ch_notify() - process an event from the smd channel for ch migration
* @priv: The edge the event occurred on.
* @event: The event to process
*/
static void ctl_ch_notify(void *priv, unsigned event)
{
struct edge_info *einfo = priv;
switch (event) {
case SMD_EVENT_DATA:
schedule_work(&einfo->work);
break;
case SMD_EVENT_OPEN:
einfo->smd_ctl_ch_open = true;
break;
case SMD_EVENT_CLOSE:
einfo->smd_ctl_ch_open = false;
break;
}
}
static int ctl_ch_probe(struct platform_device *pdev)
{
int i;
struct edge_info *einfo;
int ret = 0;
for (i = 0; i < NUM_EDGES; ++i)
if (pdev->id == edge_infos[i].smd_edge)
break;
einfo = &edge_infos[i];
ret = smd_named_open_on_edge("GLINK_CTRL", einfo->smd_edge,
&einfo->smd_ch, einfo, ctl_ch_notify);
if (ret != 0)
SMDXPRT_ERR(einfo,
"%s Opening failed %d for %d:'GLINK_CTRL'\n",
__func__, ret, einfo->smd_edge);
return ret;
}
/**
* ssr_work_func() - process the end of ssr
* @work: The ssr task to finish.
*/
static void ssr_work_func(struct work_struct *work)
{
struct delayed_work *w;
struct edge_info *einfo;
w = container_of(work, struct delayed_work, work);
einfo = container_of(w, struct edge_info, ssr_work);
mutex_lock(&einfo->in_ssr_lock);
if (einfo->in_ssr) {
einfo->in_ssr = false;
einfo->xprt_if.glink_core_if_ptr->link_up(&einfo->xprt_if);
}
mutex_unlock(&einfo->in_ssr_lock);
}
/**
* process_tx_done() - process a tx done task
* @work: The tx done task to process.
*/
static void process_tx_done(struct work_struct *work)
{
struct channel_work *ch_work;
struct channel *ch;
struct edge_info *einfo;
uint32_t riid;
ch_work = container_of(work, struct channel_work, work);
ch = ch_work->ch;
riid = ch_work->iid;
einfo = ch->edge;
kfree(ch_work);
einfo->xprt_if.glink_core_if_ptr->rx_cmd_tx_done(&einfo->xprt_if,
ch->rcid,
riid,
false);
}
/**
* process_open_event() - process an open event task
* @work: The open task to process.
*/
static void process_open_event(struct work_struct *work)
{
struct channel_work *ch_work;
struct channel *ch;
struct edge_info *einfo;
int ret;
ch_work = container_of(work, struct channel_work, work);
ch = ch_work->ch;
einfo = ch->edge;
/*
* The SMD client is supposed to already know its channel type, but we
* are just a translation layer, so we need to dynamically detect the
* channel type.
*/
ret = smd_write_segment_avail(ch->smd_ch);
if (ret == -ENODEV)
ch->streaming_ch = true;
if (ch->remote_legacy || !ch->rcid) {
ch->remote_legacy = true;
ch->rcid = ch->lcid + LEGACY_RCID_CHANNEL_OFFSET;
mutex_lock(&einfo->rx_cmd_lock);
einfo->xprt_if.glink_core_if_ptr->rx_cmd_ch_remote_open(
&einfo->xprt_if,
ch->rcid,
ch->name,
SMD_TRANS_XPRT_ID);
mutex_unlock(&einfo->rx_cmd_lock);
}
kfree(ch_work);
}
/**
* process_close_event() - process a close event task
* @work: The close task to process.
*/
static void process_close_event(struct work_struct *work)
{
struct channel_work *ch_work;
struct channel *ch;
struct edge_info *einfo;
ch_work = container_of(work, struct channel_work, work);
ch = ch_work->ch;
einfo = ch->edge;
kfree(ch_work);
if (ch->remote_legacy) {
mutex_lock(&einfo->rx_cmd_lock);
einfo->xprt_if.glink_core_if_ptr->rx_cmd_ch_remote_close(
&einfo->xprt_if,
ch->rcid);
mutex_unlock(&einfo->rx_cmd_lock);
}
ch->rcid = 0;
}
/**
* process_status_event() - process a status event task
* @work: The status task to process.
*/
static void process_status_event(struct work_struct *work)
{
struct channel_work *ch_work;
struct channel *ch;
struct edge_info *einfo;
uint32_t sigs = 0;
int set;
ch_work = container_of(work, struct channel_work, work);
ch = ch_work->ch;
einfo = ch->edge;
kfree(ch_work);
set = smd_tiocmget(ch->smd_ch);
if (set < 0)
return;
if (set & TIOCM_DTR)
sigs |= SMD_DTR_SIG;
if (set & TIOCM_RTS)
sigs |= SMD_CTS_SIG;
if (set & TIOCM_CD)
sigs |= SMD_CD_SIG;
if (set & TIOCM_RI)
sigs |= SMD_RI_SIG;
einfo->xprt_if.glink_core_if_ptr->rx_cmd_remote_sigs(&einfo->xprt_if,
ch->rcid,
sigs);
}
/**
* process_reopen_event() - process a reopen ready event task
* @work: The reopen ready task to process.
*/
static void process_reopen_event(struct work_struct *work)
{
struct channel_work *ch_work;
struct channel *ch;
struct edge_info *einfo;
ch_work = container_of(work, struct channel_work, work);
ch = ch_work->ch;
einfo = ch->edge;
kfree(ch_work);
if (ch->remote_legacy) {
mutex_lock(&einfo->rx_cmd_lock);
einfo->xprt_if.glink_core_if_ptr->rx_cmd_ch_remote_close(
&einfo->xprt_if,
ch->rcid);
mutex_unlock(&einfo->rx_cmd_lock);
}
if (ch->local_legacy) {
mutex_lock(&einfo->rx_cmd_lock);
einfo->xprt_if.glink_core_if_ptr->rx_cmd_ch_close_ack(
&einfo->xprt_if,
ch->lcid);
mutex_unlock(&einfo->rx_cmd_lock);
}
}
/**
* process_data_event() - process a data event task
* @work: The data task to process.
*/
static void process_data_event(struct work_struct *work)
{
struct channel *ch;
struct edge_info *einfo;
struct glink_core_rx_intent *intent;
int pkt_remaining;
int read_avail;
struct intent_info *i;
uint32_t liid;
unsigned long intents_flags;
unsigned long rx_data_flags;
ch = container_of(work, struct channel, work);
einfo = ch->edge;
if (ch->tx_resume_needed && smd_write_avail(ch->smd_ch) > 0) {
ch->tx_resume_needed = false;
smd_disable_read_intr(ch->smd_ch);
einfo->xprt_if.glink_core_if_ptr->tx_resume(&einfo->xprt_if);
}
spin_lock_irqsave(&ch->rx_data_lock, rx_data_flags);
while (!ch->is_closing && smd_read_avail(ch->smd_ch)) {
if (!ch->streaming_ch)
pkt_remaining = smd_cur_packet_size(ch->smd_ch);
else
pkt_remaining = smd_read_avail(ch->smd_ch);
SMDXPRT_DBG(einfo, "%s Reading packet chunk %u '%s' %u:%u\n",
__func__, pkt_remaining, ch->name, ch->lcid,
ch->rcid);
if (!ch->cur_intent && !einfo->intentless) {
spin_lock_irqsave(&ch->intents_lock, intents_flags);
ch->intent_req = true;
ch->intent_req_size = pkt_remaining;
list_for_each_entry(i, &ch->intents, node) {
if (i->size >= pkt_remaining) {
list_del(&i->node);
ch->cur_intent = i;
ch->intent_req = false;
break;
}
}
spin_unlock_irqrestore(&ch->intents_lock,
intents_flags);
if (!ch->cur_intent) {
spin_unlock_irqrestore(&ch->rx_data_lock,
rx_data_flags);
SMDXPRT_DBG(einfo,
"%s Reqesting intent '%s' %u:%u\n",
__func__, ch->name,
ch->lcid, ch->rcid);
einfo->xprt_if.glink_core_if_ptr->
rx_cmd_remote_rx_intent_req(
&einfo->xprt_if,
ch->rcid,
pkt_remaining);
return;
}
}
liid = einfo->intentless ? 0 : ch->cur_intent->liid;
read_avail = smd_read_avail(ch->smd_ch);
if (ch->streaming_ch && read_avail > pkt_remaining)
read_avail = pkt_remaining;
intent = einfo->xprt_if.glink_core_if_ptr->rx_get_pkt_ctx(
&einfo->xprt_if,
ch->rcid,
liid);
if (!intent->data && einfo->intentless) {
intent->data = kmalloc(pkt_remaining, GFP_ATOMIC);
if (!intent->data) {
SMDXPRT_DBG(einfo,
"%s kmalloc failed '%s' %u:%u\n",
__func__, ch->name,
ch->lcid, ch->rcid);
continue;
}
}
smd_read(ch->smd_ch, intent->data + intent->write_offset,
read_avail);
spin_unlock_irqrestore(&ch->rx_data_lock, rx_data_flags);
intent->write_offset += read_avail;
intent->pkt_size += read_avail;
if (read_avail == pkt_remaining && !einfo->intentless) {
spin_lock_irqsave(&ch->intents_lock, intents_flags);
list_add_tail(&ch->cur_intent->node, &ch->used_intents);
spin_unlock_irqrestore(&ch->intents_lock,
intents_flags);
ch->cur_intent = NULL;
}
einfo->xprt_if.glink_core_if_ptr->rx_put_pkt_ctx(
&einfo->xprt_if,
ch->rcid,
intent,
read_avail == pkt_remaining);
spin_lock_irqsave(&ch->rx_data_lock, rx_data_flags);
}
spin_unlock_irqrestore(&ch->rx_data_lock, rx_data_flags);
}
/**
* smd_data_ch_notify() - process an event from the smd channel
* @priv: The channel the event occurred on.
* @event: The event to process
*/
static void smd_data_ch_notify(void *priv, unsigned event)
{
struct channel *ch = priv;
struct channel_work *work;
switch (event) {
case SMD_EVENT_DATA:
queue_work(ch->wq, &ch->work);
break;
case SMD_EVENT_OPEN:
work = kmalloc(sizeof(*work), GFP_ATOMIC);
if (!work) {
SMDXPRT_ERR(ch->edge,
"%s: unable to process event %d\n",
__func__, SMD_EVENT_OPEN);
return;
}
work->ch = ch;
INIT_WORK(&work->work, process_open_event);
queue_work(ch->wq, &work->work);
break;
case SMD_EVENT_CLOSE:
work = kmalloc(sizeof(*work), GFP_ATOMIC);
if (!work) {
SMDXPRT_ERR(ch->edge,
"%s: unable to process event %d\n",
__func__, SMD_EVENT_CLOSE);
return;
}
work->ch = ch;
INIT_WORK(&work->work, process_close_event);
queue_work(ch->wq, &work->work);
break;
case SMD_EVENT_STATUS:
SMDXPRT_DBG(ch->edge,
"%s Processing STATUS for '%s' %u:%u\n",
__func__, ch->name, ch->lcid, ch->rcid);
work = kmalloc(sizeof(*work), GFP_ATOMIC);
if (!work) {
SMDXPRT_ERR(ch->edge,
"%s: unable to process event %d\n",
__func__, SMD_EVENT_STATUS);
return;
}
work->ch = ch;
INIT_WORK(&work->work, process_status_event);
queue_work(ch->wq, &work->work);
break;
case SMD_EVENT_REOPEN_READY:
work = kmalloc(sizeof(*work), GFP_ATOMIC);
if (!work) {
SMDXPRT_ERR(ch->edge,
"%s: unable to process event %d\n",
__func__, SMD_EVENT_REOPEN_READY);
return;
}
work->ch = ch;
INIT_WORK(&work->work, process_reopen_event);
queue_work(ch->wq, &work->work);
break;
}
}
/**
* smd_data_ch_close() - close and cleanup SMD data channel
* @ch: Channel to cleanup
*
* Must be called with einfo->ssr_sync SRCU locked.
*/
static void smd_data_ch_close(struct channel *ch)
{
struct intent_info *intent;
unsigned long flags;
SMDXPRT_INFO(ch->edge, "%s Closing SMD channel lcid %u\n",
__func__, ch->lcid);
ch->is_closing = true;
ch->tx_resume_needed = false;
flush_workqueue(ch->wq);
mutex_lock(&ch->ch_probe_lock);
ch->wait_for_probe = false;
if (ch->smd_ch) {
smd_close(ch->smd_ch);
ch->smd_ch = NULL;
} else if (ch->local_legacy) {
mutex_lock(&ch->edge->rx_cmd_lock);
ch->edge->xprt_if.glink_core_if_ptr->rx_cmd_ch_close_ack(
&ch->edge->xprt_if,
ch->lcid);
mutex_unlock(&ch->edge->rx_cmd_lock);
}
mutex_unlock(&ch->ch_probe_lock);
ch->local_legacy = false;
spin_lock_irqsave(&ch->intents_lock, flags);
while (!list_empty(&ch->intents)) {
intent = list_first_entry(&ch->intents, struct
intent_info, node);
list_del(&intent->node);
kfree(intent);
}
while (!list_empty(&ch->used_intents)) {
intent = list_first_entry(&ch->used_intents,
struct intent_info, node);
list_del(&intent->node);
kfree(intent);
}
spin_unlock_irqrestore(&ch->intents_lock, flags);
ch->is_closing = false;
}
static void data_ch_probe_body(struct channel *ch)
{
struct edge_info *einfo;
int ret;
einfo = ch->edge;
SMDXPRT_DBG(einfo, "%s Opening SMD channel %d:'%s'\n", __func__,
einfo->smd_edge, ch->name);
ret = smd_named_open_on_edge(ch->name, einfo->smd_edge, &ch->smd_ch, ch,
smd_data_ch_notify);
if (ret != 0) {
SMDXPRT_ERR(einfo, "%s Opening failed %d for %d:'%s'\n",
__func__, ret, einfo->smd_edge, ch->name);
return;
}
smd_disable_read_intr(ch->smd_ch);
}
static int channel_probe(struct platform_device *pdev)
{
struct channel *ch;
struct edge_info *einfo;
int i;
bool found = false;
unsigned long flags;
for (i = 0; i < NUM_EDGES; ++i) {
if (edge_infos[i].smd_edge == pdev->id) {
found = true;
break;
}
}
if (!found)
return -EPROBE_DEFER;
einfo = &edge_infos[i];
found = false;
spin_lock_irqsave(&einfo->channels_lock, flags);
list_for_each_entry(ch, &einfo->channels, node) {
if (!strcmp(pdev->name, ch->name)) {
found = true;
break;
}
}
spin_unlock_irqrestore(&einfo->channels_lock, flags);
if (!found)
return -EPROBE_DEFER;
mutex_lock(&ch->ch_probe_lock);
if (!ch->wait_for_probe) {
mutex_unlock(&ch->ch_probe_lock);
return -EPROBE_DEFER;
}
ch->wait_for_probe = false;
ch->had_probed = true;
data_ch_probe_body(ch);
mutex_unlock(&ch->ch_probe_lock);
return 0;
}
static int dummy_probe(struct platform_device *pdev)
{
return 0;
}
static struct platform_driver dummy_driver = {
.probe = dummy_probe,
.driver = {
.name = "dummydriver12345",
.owner = THIS_MODULE,
},
};
static struct platform_device dummy_device = {
.name = "dummydriver12345",
};
/**
* add_platform_driver() - register the needed platform driver for a channel
* @ch: The channel that needs a platform driver registered.
*
* SMD channels are unique by name/edge tuples, but the platform driver can
* only specify the name of the channel, so multiple unique SMD channels can
* be covered under one platform driver. Therfore we need to smartly manage
* the muxing of channels on platform drivers.
*
* Return: Success or standard linux error code.
*/
static int add_platform_driver(struct channel *ch)
{
struct pdrvs *pdrv;
bool found = false;
int ret = 0;
static bool first = true;
mutex_lock(&pdrv_list_mutex);
mutex_lock(&ch->ch_probe_lock);
ch->wait_for_probe = true;
list_for_each_entry(pdrv, &pdrv_list, node) {
if (!strcmp(ch->name, pdrv->pdrv.driver.name)) {
found = true;
break;
}
}
if (!found) {
mutex_unlock(&ch->ch_probe_lock);
pdrv = kzalloc(sizeof(*pdrv), GFP_KERNEL);
if (!pdrv) {
ret = -ENOMEM;
mutex_lock(&ch->ch_probe_lock);
ch->wait_for_probe = false;
mutex_unlock(&ch->ch_probe_lock);
goto out;
}
pdrv->pdrv.driver.name = ch->name;
pdrv->pdrv.driver.owner = THIS_MODULE;
pdrv->pdrv.probe = channel_probe;
list_add_tail(&pdrv->node, &pdrv_list);
ret = platform_driver_register(&pdrv->pdrv);
if (ret) {
list_del(&pdrv->node);
kfree(pdrv);
mutex_lock(&ch->ch_probe_lock);
ch->wait_for_probe = false;
mutex_unlock(&ch->ch_probe_lock);
}
} else {
if (ch->had_probed)
data_ch_probe_body(ch);
mutex_unlock(&ch->ch_probe_lock);
/*
* channel_probe might have seen the device we want, but
* returned EPROBE_DEFER so we need to kick the deferred list
*/
platform_driver_register(&dummy_driver);
if (first) {
platform_device_register(&dummy_device);
first = false;
}
platform_driver_unregister(&dummy_driver);
}
out:
mutex_unlock(&pdrv_list_mutex);
return ret;
}
/**
* tx_cmd_version() - convert a version cmd to wire format and transmit
* @if_ptr: The transport to transmit on.
* @version: The version number to encode.
* @features: The features information to encode.
*
* The remote side doesn't speak G-Link, so we fake the version negotiation.
*/
static void tx_cmd_version(struct glink_transport_if *if_ptr, uint32_t version,
uint32_t features)
{
struct edge_info *einfo;
einfo = container_of(if_ptr, struct edge_info, xprt_if);
einfo->xprt_if.glink_core_if_ptr->rx_cmd_version_ack(&einfo->xprt_if,
version,
features);
einfo->xprt_if.glink_core_if_ptr->rx_cmd_version(&einfo->xprt_if,
version,
features);
}
/**
* tx_cmd_version_ack() - convert a version ack cmd to wire format and transmit
* @if_ptr: The transport to transmit on.
* @version: The version number to encode.
* @features: The features information to encode.
*
* The remote side doesn't speak G-Link. The core is acking a version command
* we faked. Do nothing.
*/
static void tx_cmd_version_ack(struct glink_transport_if *if_ptr,
uint32_t version,
uint32_t features)
{
}
/**
* set_version() - activate a negotiated version and feature set
* @if_ptr: The transport to configure.
* @version: The version to use.
* @features: The features to use.
*
* Return: The supported capabilities of the transport.
*/
static uint32_t set_version(struct glink_transport_if *if_ptr, uint32_t version,
uint32_t features)
{
struct edge_info *einfo;
uint32_t capabilities = GCAP_SIGNALS | GCAP_AUTO_QUEUE_RX_INT;
einfo = container_of(if_ptr, struct edge_info, xprt_if);
return einfo->intentless ?
GCAP_INTENTLESS | capabilities : capabilities;
}
/**
* tx_cmd_ch_open() - convert a channel open cmd to wire format and transmit
* @if_ptr: The transport to transmit on.
* @lcid: The local channel id to encode.
* @name: The channel name to encode.
* @req_xprt: The transport the core would like to migrate this channel to.
*
* Return: 0 on success or standard Linux error code.
*/
static int tx_cmd_ch_open(struct glink_transport_if *if_ptr, uint32_t lcid,
const char *name, uint16_t req_xprt)
{
struct command {
uint32_t cmd;
uint32_t id;
uint32_t priority;
};
struct command cmd;
struct edge_info *einfo;
struct channel *ch;
struct channel *temp_ch;
bool found = false;
int rcu_id;
int ret = 0;
int len;
unsigned long flags;
einfo = container_of(if_ptr, struct edge_info, xprt_if);
rcu_id = srcu_read_lock(&einfo->ssr_sync);
if (einfo->in_ssr) {
srcu_read_unlock(&einfo->ssr_sync, rcu_id);
return -EFAULT;
}
spin_lock_irqsave(&einfo->channels_lock, flags);
list_for_each_entry(ch, &einfo->channels, node) {
if (!strcmp(name, ch->name)) {
found = true;
break;
}
}
spin_unlock_irqrestore(&einfo->channels_lock, flags);
if (!found) {
ch = kzalloc(sizeof(*ch), GFP_KERNEL);
if (!ch) {
SMDXPRT_ERR(einfo,
"%s: channel struct allocation failed\n",
__func__);
srcu_read_unlock(&einfo->ssr_sync, rcu_id);
return -ENOMEM;
}
strlcpy(ch->name, name, GLINK_NAME_SIZE);
ch->edge = einfo;
mutex_init(&ch->ch_probe_lock);
INIT_LIST_HEAD(&ch->intents);
INIT_LIST_HEAD(&ch->used_intents);
spin_lock_init(&ch->intents_lock);
spin_lock_init(&ch->rx_data_lock);
INIT_WORK(&ch->work, process_data_event);
ch->wq = create_singlethread_workqueue(ch->name);
if (!ch->wq) {
SMDXPRT_ERR(einfo,
"%s: channel workqueue create failed\n",
__func__);
kfree(ch);
srcu_read_unlock(&einfo->ssr_sync, rcu_id);
return -ENOMEM;
}
/*
* Channel could have been added to the list by someone else
* so scan again. Channel creation is non-atomic, so unlock
* and recheck is necessary
*/
temp_ch = ch;
spin_lock_irqsave(&einfo->channels_lock, flags);
list_for_each_entry(ch, &einfo->channels, node)
if (!strcmp(name, ch->name)) {
found = true;
break;
}
if (!found) {
ch = temp_ch;
list_add_tail(&ch->node, &einfo->channels);
spin_unlock_irqrestore(&einfo->channels_lock, flags);
} else {
spin_unlock_irqrestore(&einfo->channels_lock, flags);
destroy_workqueue(temp_ch->wq);
kfree(temp_ch);
}
}
ch->tx_resume_needed = false;
ch->lcid = lcid;
if (einfo->smd_ctl_ch_open) {
SMDXPRT_INFO(einfo, "%s TX OPEN '%s' lcid %u reqxprt %u\n",
__func__, name, lcid, req_xprt);
cmd.cmd = CMD_OPEN;
cmd.id = lcid;
cmd.priority = req_xprt;
len = strlen(name) + 1;
len += sizeof(cmd);
mutex_lock(&einfo->smd_lock);
while (smd_write_avail(einfo->smd_ch) < len)
msleep(20);
smd_write_start(einfo->smd_ch, len);
smd_write_segment(einfo->smd_ch, &cmd, sizeof(cmd));
smd_write_segment(einfo->smd_ch, name, strlen(name) + 1);
smd_write_end(einfo->smd_ch);
mutex_unlock(&einfo->smd_lock);
} else {
SMDXPRT_INFO(einfo, "%s Legacy Open '%s' lcid %u reqxprt %u\n",
__func__, name, lcid, req_xprt);
ch->rcid = lcid + LEGACY_RCID_CHANNEL_OFFSET;
ch->local_legacy = true;
ch->remote_legacy = true;
ret = add_platform_driver(ch);
if (!ret) {
mutex_lock(&einfo->rx_cmd_lock);
einfo->xprt_if.glink_core_if_ptr->rx_cmd_ch_open_ack(
&einfo->xprt_if,
ch->lcid, SMD_TRANS_XPRT_ID);
mutex_unlock(&einfo->rx_cmd_lock);
}
}
srcu_read_unlock(&einfo->ssr_sync, rcu_id);
return ret;
}
/**
* tx_cmd_ch_close() - convert a channel close cmd to wire format and transmit
* @if_ptr: The transport to transmit on.
* @lcid: The local channel id to encode.
*
* Return: 0 on success or standard Linux error code.
*/
static int tx_cmd_ch_close(struct glink_transport_if *if_ptr, uint32_t lcid)
{
struct command {
uint32_t cmd;
uint32_t id;
uint32_t reserved;
};
struct command cmd;
struct edge_info *einfo;
struct channel *ch;
int rcu_id;
bool found = false;
unsigned long flags;
einfo = container_of(if_ptr, struct edge_info, xprt_if);
rcu_id = srcu_read_lock(&einfo->ssr_sync);
if (einfo->in_ssr) {
srcu_read_unlock(&einfo->ssr_sync, rcu_id);
return -EFAULT;
}
spin_lock_irqsave(&einfo->channels_lock, flags);
list_for_each_entry(ch, &einfo->channels, node)
if (lcid == ch->lcid) {
found = true;
break;
}
spin_unlock_irqrestore(&einfo->channels_lock, flags);
if (!found) {
SMDXPRT_ERR(einfo, "%s LCID not found %u\n",
__func__, lcid);
srcu_read_unlock(&einfo->ssr_sync, rcu_id);
return -ENODEV;
}
if (!ch->local_legacy) {
SMDXPRT_INFO(einfo, "%s TX CLOSE lcid %u\n", __func__, lcid);
cmd.cmd = CMD_CLOSE;
cmd.id = lcid;
cmd.reserved = 0;
mutex_lock(&einfo->smd_lock);
while (smd_write_avail(einfo->smd_ch) < sizeof(cmd))
msleep(20);
smd_write(einfo->smd_ch, &cmd, sizeof(cmd));
mutex_unlock(&einfo->smd_lock);
} else {
smd_data_ch_close(ch);
}
srcu_read_unlock(&einfo->ssr_sync, rcu_id);
return 0;
}
/**
* tx_cmd_ch_remote_open_ack() - convert a channel open ack cmd to wire format
* and transmit
* @if_ptr: The transport to transmit on.
* @rcid: The remote channel id to encode.
* @xprt_resp: The response to a transport migration request.
*/
static void tx_cmd_ch_remote_open_ack(struct glink_transport_if *if_ptr,
uint32_t rcid, uint16_t xprt_resp)
{
struct command {
uint32_t cmd;
uint32_t id;
uint32_t priority;
};
struct command cmd;
struct edge_info *einfo;
struct channel *ch;
bool found = false;
unsigned long flags;
einfo = container_of(if_ptr, struct edge_info, xprt_if);
if (!einfo->smd_ctl_ch_open)
return;
spin_lock_irqsave(&einfo->channels_lock, flags);
list_for_each_entry(ch, &einfo->channels, node)
if (ch->rcid == rcid) {
found = true;
break;
}
spin_unlock_irqrestore(&einfo->channels_lock, flags);
if (!found) {
SMDXPRT_ERR(einfo, "%s No matching SMD channel for rcid %u\n",
__func__, rcid);
return;
}
if (ch->remote_legacy) {
SMDXPRT_INFO(einfo, "%s Legacy ch rcid %u xprt_resp %u\n",
__func__, rcid, xprt_resp);
return;
}
SMDXPRT_INFO(einfo, "%s TX OPEN ACK rcid %u xprt_resp %u\n",
__func__, rcid, xprt_resp);
cmd.cmd = CMD_OPEN_ACK;
cmd.id = ch->rcid;
cmd.priority = xprt_resp;
mutex_lock(&einfo->smd_lock);
while (smd_write_avail(einfo->smd_ch) < sizeof(cmd))
msleep(20);
smd_write(einfo->smd_ch, &cmd, sizeof(cmd));
mutex_unlock(&einfo->smd_lock);
}
/**
* tx_cmd_ch_remote_close_ack() - convert a channel close ack cmd to wire format
* and transmit
* @if_ptr: The transport to transmit on.
* @rcid: The remote channel id to encode.
*/
static void tx_cmd_ch_remote_close_ack(struct glink_transport_if *if_ptr,
uint32_t rcid)
{
struct command {
uint32_t cmd;
uint32_t id;
uint32_t reserved;
};
struct command cmd;
struct edge_info *einfo;
struct channel *ch;
bool found = false;
unsigned long flags;
einfo = container_of(if_ptr, struct edge_info, xprt_if);
spin_lock_irqsave(&einfo->channels_lock, flags);
list_for_each_entry(ch, &einfo->channels, node)
if (rcid == ch->rcid) {
found = true;
break;
}
spin_unlock_irqrestore(&einfo->channels_lock, flags);
if (!found) {
SMDXPRT_ERR(einfo,
"%s No matching SMD channel for rcid %u\n",
__func__, rcid);
return;
}
if (!ch->remote_legacy) {
SMDXPRT_INFO(einfo, "%s TX CLOSE ACK rcid %u\n",
__func__, rcid);
cmd.cmd = CMD_CLOSE_ACK;
cmd.id = rcid;
cmd.reserved = 0;
mutex_lock(&einfo->smd_lock);
while (smd_write_avail(einfo->smd_ch) < sizeof(cmd))
msleep(20);
smd_write(einfo->smd_ch, &cmd, sizeof(cmd));
mutex_unlock(&einfo->smd_lock);
}
ch->remote_legacy = false;
ch->rcid = 0;
}
/**
* ssr() - process a subsystem restart notification of a transport
* @if_ptr: The transport to restart.
*
* Return: 0 on success or standard Linux error code.
*/
static int ssr(struct glink_transport_if *if_ptr)
{
struct edge_info *einfo;
struct channel *ch;
struct intent_info *intent;
unsigned long flags;
einfo = container_of(if_ptr, struct edge_info, xprt_if);
einfo->in_ssr = true;
synchronize_srcu(&einfo->ssr_sync);
einfo->smd_ctl_ch_open = false;
spin_lock_irqsave(&einfo->channels_lock, flags);
list_for_each_entry(ch, &einfo->channels, node) {
spin_unlock_irqrestore(&einfo->channels_lock, flags);
ch->is_closing = true;
flush_workqueue(ch->wq);
mutex_lock(&ch->ch_probe_lock);
ch->wait_for_probe = false;
if (ch->smd_ch) {
smd_close(ch->smd_ch);
ch->smd_ch = NULL;
}
mutex_unlock(&ch->ch_probe_lock);
ch->local_legacy = false;
ch->remote_legacy = false;
ch->rcid = 0;
ch->tx_resume_needed = false;
spin_lock_irqsave(&ch->intents_lock, flags);
while (!list_empty(&ch->intents)) {
intent = list_first_entry(&ch->intents,
struct intent_info,
node);
list_del(&intent->node);
kfree(intent);
}
while (!list_empty(&ch->used_intents)) {
intent = list_first_entry(&ch->used_intents,
struct intent_info,
node);
list_del(&intent->node);
kfree(intent);
}
kfree(ch->cur_intent);
ch->cur_intent = NULL;
spin_unlock_irqrestore(&ch->intents_lock, flags);
ch->is_closing = false;
spin_lock_irqsave(&einfo->channels_lock, flags);
}
spin_unlock_irqrestore(&einfo->channels_lock, flags);
einfo->xprt_if.glink_core_if_ptr->link_down(&einfo->xprt_if);
schedule_delayed_work(&einfo->ssr_work, 5 * HZ);
return 0;
}
/**
* allocate_rx_intent() - allocate/reserve space for RX Intent
* @if_ptr: The transport the intent is associated with.
* @size: size of intent.
* @intent: Pointer to the intent structure.
*
* Assign "data" with the buffer created, since the transport creates
* a linear buffer and "iovec" with the "intent" itself, so that
* the data can be passed to a client that receives only vector buffer.
* Note that returning NULL for the pointer is valid (it means that space has
* been reserved, but the actual pointer will be provided later).
*
* Return: 0 on success or standard Linux error code.
*/
static int allocate_rx_intent(struct glink_transport_if *if_ptr, size_t size,
struct glink_core_rx_intent *intent)
{
void *t;
t = kmalloc(size, GFP_KERNEL);
if (!t)
return -ENOMEM;
intent->data = t;
intent->iovec = (void *)intent;
intent->vprovider = rx_linear_vbuf_provider;
intent->pprovider = NULL;
return 0;
}
/**
* deallocate_rx_intent() - Deallocate space created for RX Intent
* @if_ptr: The transport the intent is associated with.
* @intent: Pointer to the intent structure.
*
* Return: 0 on success or standard Linux error code.
*/
static int deallocate_rx_intent(struct glink_transport_if *if_ptr,
struct glink_core_rx_intent *intent)
{
if (!intent || !intent->data)
return -EINVAL;
kfree(intent->data);
intent->data = NULL;
intent->iovec = NULL;
intent->vprovider = NULL;
return 0;
}
/**
* check_and_resume_rx() - Check the RX state and resume it
* @ch: Channel which needs to be checked.
* @intent_size: Intent size being queued.
*
* This function checks if a receive intent is requested in the
* channel and resumes the RX if the queued receive intent satisifes
* the requested receive intent. This function must be called with
* ch->intents_lock locked.
*/
static void check_and_resume_rx(struct channel *ch, size_t intent_size)
{
if (ch->intent_req && ch->intent_req_size <= intent_size) {
ch->intent_req = false;
queue_work(ch->wq, &ch->work);
}
}
/**
* tx_cmd_local_rx_intent() - convert an rx intent cmd to wire format and
* transmit
* @if_ptr: The transport to transmit on.
* @lcid: The local channel id to encode.
* @size: The intent size to encode.
* @liid: The local intent id to encode.
*
* Return: 0 on success or standard Linux error code.
*/
static int tx_cmd_local_rx_intent(struct glink_transport_if *if_ptr,
uint32_t lcid, size_t size, uint32_t liid)
{
struct edge_info *einfo;
struct channel *ch;
struct intent_info *intent;
int rcu_id;
unsigned long flags;
einfo = container_of(if_ptr, struct edge_info, xprt_if);
rcu_id = srcu_read_lock(&einfo->ssr_sync);
if (einfo->in_ssr) {
srcu_read_unlock(&einfo->ssr_sync, rcu_id);
return -EFAULT;
}
spin_lock_irqsave(&einfo->channels_lock, flags);
list_for_each_entry(ch, &einfo->channels, node) {
if (lcid == ch->lcid)
break;
}
spin_unlock_irqrestore(&einfo->channels_lock, flags);
intent = kmalloc(sizeof(*intent), GFP_KERNEL);
if (!intent) {
SMDXPRT_ERR(einfo, "%s: no memory for intent\n", __func__);
srcu_read_unlock(&einfo->ssr_sync, rcu_id);
return -ENOMEM;
}
intent->liid = liid;
intent->size = size;
spin_lock_irqsave(&ch->intents_lock, flags);
list_add_tail(&intent->node, &ch->intents);
check_and_resume_rx(ch, size);
spin_unlock_irqrestore(&ch->intents_lock, flags);
srcu_read_unlock(&einfo->ssr_sync, rcu_id);
return 0;
}
/**
* tx_cmd_local_rx_done() - convert an rx done cmd to wire format and transmit
* @if_ptr: The transport to transmit on.
* @lcid: The local channel id to encode.
* @liid: The local intent id to encode.
* @reuse: Reuse the consumed intent.
*/
static void tx_cmd_local_rx_done(struct glink_transport_if *if_ptr,
uint32_t lcid, uint32_t liid, bool reuse)
{
struct edge_info *einfo;
struct channel *ch;
struct intent_info *i;
unsigned long flags;
einfo = container_of(if_ptr, struct edge_info, xprt_if);
spin_lock_irqsave(&einfo->channels_lock, flags);
list_for_each_entry(ch, &einfo->channels, node) {
if (lcid == ch->lcid)
break;
}
spin_unlock_irqrestore(&einfo->channels_lock, flags);
spin_lock_irqsave(&ch->intents_lock, flags);
list_for_each_entry(i, &ch->used_intents, node) {
if (i->liid == liid) {
list_del(&i->node);
if (reuse) {
list_add_tail(&i->node, &ch->intents);
check_and_resume_rx(ch, i->size);
} else {
kfree(i);
}
break;
}
}
spin_unlock_irqrestore(&ch->intents_lock, flags);
}
/**
* tx() - convert a data transmit cmd to wire format and transmit
* @if_ptr: The transport to transmit on.
* @lcid: The local channel id to encode.
* @pctx: The data to encode.
*
* Return: Number of bytes written or standard Linux error code.
*/
static int tx(struct glink_transport_if *if_ptr, uint32_t lcid,
struct glink_core_tx_pkt *pctx)
{
struct edge_info *einfo;
struct channel *ch;
int rc;
struct channel_work *tx_done;
const void *data_start;
size_t tx_size = 0;
int rcu_id;
unsigned long flags;
einfo = container_of(if_ptr, struct edge_info, xprt_if);
rcu_id = srcu_read_lock(&einfo->ssr_sync);
if (einfo->in_ssr) {
srcu_read_unlock(&einfo->ssr_sync, rcu_id);
return -EFAULT;
}
spin_lock_irqsave(&einfo->channels_lock, flags);
list_for_each_entry(ch, &einfo->channels, node) {
if (lcid == ch->lcid)
break;
}
spin_unlock_irqrestore(&einfo->channels_lock, flags);
data_start = get_tx_vaddr(pctx, pctx->size - pctx->size_remaining,
&tx_size);
if (!data_start) {
srcu_read_unlock(&einfo->ssr_sync, rcu_id);
return -EINVAL;
}
if (!ch->streaming_ch) {
if (pctx->size == pctx->size_remaining) {
rc = check_write_avail(smd_write_avail, ch);
if (rc <= 0) {
srcu_read_unlock(&einfo->ssr_sync, rcu_id);
return rc;
}
rc = smd_write_start(ch->smd_ch, pctx->size);
if (rc) {
srcu_read_unlock(&einfo->ssr_sync, rcu_id);
return rc;
}
}
rc = check_write_avail(smd_write_segment_avail, ch);
if (rc <= 0) {
srcu_read_unlock(&einfo->ssr_sync, rcu_id);
return rc;
}
if (rc > tx_size)
rc = tx_size;
rc = smd_write_segment(ch->smd_ch, data_start, rc);
if (rc < 0) {
SMDXPRT_ERR(einfo, "%s: write segment failed %d\n",
__func__, rc);
srcu_read_unlock(&einfo->ssr_sync, rcu_id);
return rc;
}
} else {
rc = check_write_avail(smd_write_avail, ch);
if (rc <= 0) {
srcu_read_unlock(&einfo->ssr_sync, rcu_id);
return rc;
}
if (rc > tx_size)
rc = tx_size;
rc = smd_write(ch->smd_ch, data_start, rc);
if (rc < 0) {
SMDXPRT_ERR(einfo, "%s: write failed %d\n",
__func__, rc);
srcu_read_unlock(&einfo->ssr_sync, rcu_id);
return rc;
}
}
pctx->size_remaining -= rc;
if (!pctx->size_remaining) {
if (!ch->streaming_ch)
smd_write_end(ch->smd_ch);
tx_done = kmalloc(sizeof(*tx_done), GFP_ATOMIC);
tx_done->ch = ch;
tx_done->iid = pctx->riid;
INIT_WORK(&tx_done->work, process_tx_done);
queue_work(ch->wq, &tx_done->work);
}
srcu_read_unlock(&einfo->ssr_sync, rcu_id);
return rc;
}
/**
* tx_cmd_rx_intent_req() - convert an rx intent request cmd to wire format and
* transmit
* @if_ptr: The transport to transmit on.
* @lcid: The local channel id to encode.
* @size: The requested intent size to encode.
*
* Return: 0 on success or standard Linux error code.
*/
static int tx_cmd_rx_intent_req(struct glink_transport_if *if_ptr,
uint32_t lcid, size_t size)
{
struct edge_info *einfo;
struct channel *ch;
unsigned long flags;
einfo = container_of(if_ptr, struct edge_info, xprt_if);
spin_lock_irqsave(&einfo->channels_lock, flags);
list_for_each_entry(ch, &einfo->channels, node) {
if (lcid == ch->lcid)
break;
}
spin_unlock_irqrestore(&einfo->channels_lock, flags);
einfo->xprt_if.glink_core_if_ptr->rx_cmd_rx_intent_req_ack(
&einfo->xprt_if,
ch->rcid,
true);
einfo->xprt_if.glink_core_if_ptr->rx_cmd_remote_rx_intent_put(
&einfo->xprt_if,
ch->rcid,
ch->next_intent_id++,
size);
return 0;
}
/**
* tx_cmd_rx_intent_req_ack() - convert an rx intent request ack cmd to wire
* format and transmit
* @if_ptr: The transport to transmit on.
* @lcid: The local channel id to encode.
* @granted: The request response to encode.
*
* The remote side doesn't speak G-Link. The core is just acking a request we
* faked. Do nothing.
*
* Return: 0 on success or standard Linux error code.
*/
static int tx_cmd_remote_rx_intent_req_ack(struct glink_transport_if *if_ptr,
uint32_t lcid, bool granted)
{
return 0;
}
/**
* tx_cmd_set_sigs() - convert a signal cmd to wire format and transmit
* @if_ptr: The transport to transmit on.
* @lcid: The local channel id to encode.
* @sigs: The signals to encode.
*
* Return: 0 on success or standard Linux error code.
*/
static int tx_cmd_set_sigs(struct glink_transport_if *if_ptr, uint32_t lcid,
uint32_t sigs)
{
struct edge_info *einfo;
struct channel *ch;
uint32_t set = 0;
uint32_t clear = 0;
unsigned long flags;
einfo = container_of(if_ptr, struct edge_info, xprt_if);
spin_lock_irqsave(&einfo->channels_lock, flags);
list_for_each_entry(ch, &einfo->channels, node) {
if (lcid == ch->lcid)
break;
}
spin_unlock_irqrestore(&einfo->channels_lock, flags);
if (sigs & SMD_DTR_SIG)
set |= TIOCM_DTR;
else
clear |= TIOCM_DTR;
if (sigs & SMD_CTS_SIG)
set |= TIOCM_RTS;
else
clear |= TIOCM_RTS;
if (sigs & SMD_CD_SIG)
set |= TIOCM_CD;
else
clear |= TIOCM_CD;
if (sigs & SMD_RI_SIG)
set |= TIOCM_RI;
else
clear |= TIOCM_RI;
return smd_tiocmset(ch->smd_ch, set, clear);
}
/**
* poll() - poll for data on a channel
* @if_ptr: The transport to transmit on.
* @lcid: The local channel id for the channel.
*
* Return: 0 if no data available, 1 if data available, or standard Linux error
* code.
*/
static int poll(struct glink_transport_if *if_ptr, uint32_t lcid)
{
struct edge_info *einfo;
struct channel *ch;
int rc;
unsigned long flags;
einfo = container_of(if_ptr, struct edge_info, xprt_if);
spin_lock_irqsave(&einfo->channels_lock, flags);
list_for_each_entry(ch, &einfo->channels, node) {
if (lcid == ch->lcid)
break;
}
spin_unlock_irqrestore(&einfo->channels_lock, flags);
rc = smd_is_pkt_avail(ch->smd_ch);
if (rc == 1)
process_data_event(&ch->work);
return rc;
}
/**
* mask_rx_irq() - mask the receive irq
* @if_ptr: The transport to transmit on.
* @lcid: The local channel id for the channel.
* @mask: True to mask the irq, false to unmask.
* @pstruct: Platform defined structure for handling the masking.
*
* Return: 0 on success or standard Linux error code.
*/
static int mask_rx_irq(struct glink_transport_if *if_ptr, uint32_t lcid,
bool mask, void *pstruct)
{
struct edge_info *einfo;
struct channel *ch;
int ret = 0;
unsigned long flags;
einfo = container_of(if_ptr, struct edge_info, xprt_if);
spin_lock_irqsave(&einfo->channels_lock, flags);
list_for_each_entry(ch, &einfo->channels, node) {
if (lcid == ch->lcid)
break;
}
spin_unlock_irqrestore(&einfo->channels_lock, flags);
ret = smd_mask_receive_interrupt(ch->smd_ch, mask, pstruct);
if (ret == 0)
einfo->irq_disabled = mask;
return ret;
}
/**
* negotiate_features_v1() - determine what features of a version can be used
* @if_ptr: The transport for which features are negotiated for.
* @version: The version negotiated.
* @features: The set of requested features.
*
* Return: What set of the requested features can be supported.
*/
static uint32_t negotiate_features_v1(struct glink_transport_if *if_ptr,
const struct glink_core_version *version,
uint32_t features)
{
return features & version->features;
}
/**
* init_xprt_if() - initialize the xprt_if for an edge
* @einfo: The edge to initialize.
*/
static void init_xprt_if(struct edge_info *einfo)
{
einfo->xprt_if.tx_cmd_version = tx_cmd_version;
einfo->xprt_if.tx_cmd_version_ack = tx_cmd_version_ack;
einfo->xprt_if.set_version = set_version;
einfo->xprt_if.tx_cmd_ch_open = tx_cmd_ch_open;
einfo->xprt_if.tx_cmd_ch_close = tx_cmd_ch_close;
einfo->xprt_if.tx_cmd_ch_remote_open_ack = tx_cmd_ch_remote_open_ack;
einfo->xprt_if.tx_cmd_ch_remote_close_ack = tx_cmd_ch_remote_close_ack;
einfo->xprt_if.ssr = ssr;
einfo->xprt_if.allocate_rx_intent = allocate_rx_intent;
einfo->xprt_if.deallocate_rx_intent = deallocate_rx_intent;
einfo->xprt_if.tx_cmd_local_rx_intent = tx_cmd_local_rx_intent;
einfo->xprt_if.tx_cmd_local_rx_done = tx_cmd_local_rx_done;
einfo->xprt_if.tx = tx;
einfo->xprt_if.tx_cmd_rx_intent_req = tx_cmd_rx_intent_req;
einfo->xprt_if.tx_cmd_remote_rx_intent_req_ack =
tx_cmd_remote_rx_intent_req_ack;
einfo->xprt_if.tx_cmd_set_sigs = tx_cmd_set_sigs;
einfo->xprt_if.poll = poll;
einfo->xprt_if.mask_rx_irq = mask_rx_irq;
}
/**
* init_xprt_cfg() - initialize the xprt_cfg for an edge
* @einfo: The edge to initialize.
*/
static void init_xprt_cfg(struct edge_info *einfo)
{
einfo->xprt_cfg.name = XPRT_NAME;
einfo->xprt_cfg.versions = versions;
einfo->xprt_cfg.versions_entries = ARRAY_SIZE(versions);
einfo->xprt_cfg.max_cid = SZ_64;
einfo->xprt_cfg.max_iid = SZ_128;
}
static struct platform_driver migration_driver = {
.probe = ctl_ch_probe,
.driver = {
.name = "GLINK_CTRL",
.owner = THIS_MODULE,
},
};
static int __init glink_smd_xprt_init(void)
{
int i;
int rc;
struct edge_info *einfo;
for (i = 0; i < NUM_EDGES; ++i) {
einfo = &edge_infos[i];
init_xprt_cfg(einfo);
init_xprt_if(einfo);
INIT_LIST_HEAD(&einfo->channels);
spin_lock_init(&einfo->channels_lock);
init_srcu_struct(&einfo->ssr_sync);
mutex_init(&einfo->smd_lock);
mutex_init(&einfo->in_ssr_lock);
mutex_init(&einfo->rx_cmd_lock);
INIT_DELAYED_WORK(&einfo->ssr_work, ssr_work_func);
INIT_WORK(&einfo->work, process_ctl_event);
rc = glink_core_register_transport(&einfo->xprt_if,
&einfo->xprt_cfg);
if (rc)
SMDXPRT_ERR(einfo,
"%s: %s glink register xprt failed %d\n",
__func__, einfo->xprt_cfg.edge, rc);
else
einfo->xprt_if.glink_core_if_ptr->link_up(
&einfo->xprt_if);
}
platform_driver_register(&migration_driver);
return 0;
}
arch_initcall(glink_smd_xprt_init);
MODULE_DESCRIPTION("MSM G-Link SMD Transport");
MODULE_LICENSE("GPL v2");
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