![Alexander Usyskin](/assets/img/avatar_default.png)
AMTHIF has special support in the mei drive, it handles multiplexing multiple user space connection above single me client connection. Since there is no additional addressing information there is a strict requirement on the traffic order on each connection and on the "read after write" order within the connection. This creates a lot of complexity mostly because the other client types do not necessarily fall under the same restriction. After carefully studying the use of the AMTHIF client, we came to conclusion that the multiplexing is not really utilized by any application and we may safely remove that support and significantly simplify the driver. Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com> Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
1792 lines
37 KiB
C
1792 lines
37 KiB
C
/*
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*
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* Intel Management Engine Interface (Intel MEI) Linux driver
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* Copyright (c) 2003-2012, Intel Corporation.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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*/
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#include <linux/sched/signal.h>
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#include <linux/wait.h>
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#include <linux/delay.h>
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#include <linux/slab.h>
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#include <linux/pm_runtime.h>
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#include <linux/mei.h>
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#include "mei_dev.h"
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#include "hbm.h"
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#include "client.h"
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/**
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* mei_me_cl_init - initialize me client
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*
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* @me_cl: me client
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*/
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void mei_me_cl_init(struct mei_me_client *me_cl)
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{
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INIT_LIST_HEAD(&me_cl->list);
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kref_init(&me_cl->refcnt);
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}
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/**
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* mei_me_cl_get - increases me client refcount
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*
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* @me_cl: me client
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*
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* Locking: called under "dev->device_lock" lock
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*
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* Return: me client or NULL
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*/
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struct mei_me_client *mei_me_cl_get(struct mei_me_client *me_cl)
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{
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if (me_cl && kref_get_unless_zero(&me_cl->refcnt))
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return me_cl;
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return NULL;
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}
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/**
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* mei_me_cl_release - free me client
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*
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* Locking: called under "dev->device_lock" lock
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*
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* @ref: me_client refcount
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*/
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static void mei_me_cl_release(struct kref *ref)
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{
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struct mei_me_client *me_cl =
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container_of(ref, struct mei_me_client, refcnt);
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kfree(me_cl);
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}
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/**
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* mei_me_cl_put - decrease me client refcount and free client if necessary
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*
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* Locking: called under "dev->device_lock" lock
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*
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* @me_cl: me client
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*/
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void mei_me_cl_put(struct mei_me_client *me_cl)
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{
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if (me_cl)
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kref_put(&me_cl->refcnt, mei_me_cl_release);
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}
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/**
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* __mei_me_cl_del - delete me client from the list and decrease
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* reference counter
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*
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* @dev: mei device
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* @me_cl: me client
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*
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* Locking: dev->me_clients_rwsem
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*/
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static void __mei_me_cl_del(struct mei_device *dev, struct mei_me_client *me_cl)
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{
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if (!me_cl)
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return;
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list_del_init(&me_cl->list);
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mei_me_cl_put(me_cl);
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}
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/**
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* mei_me_cl_del - delete me client from the list and decrease
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* reference counter
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*
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* @dev: mei device
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* @me_cl: me client
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*/
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void mei_me_cl_del(struct mei_device *dev, struct mei_me_client *me_cl)
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{
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down_write(&dev->me_clients_rwsem);
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__mei_me_cl_del(dev, me_cl);
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up_write(&dev->me_clients_rwsem);
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}
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/**
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* mei_me_cl_add - add me client to the list
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*
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* @dev: mei device
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* @me_cl: me client
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*/
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void mei_me_cl_add(struct mei_device *dev, struct mei_me_client *me_cl)
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{
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down_write(&dev->me_clients_rwsem);
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list_add(&me_cl->list, &dev->me_clients);
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up_write(&dev->me_clients_rwsem);
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}
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/**
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* __mei_me_cl_by_uuid - locate me client by uuid
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* increases ref count
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*
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* @dev: mei device
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* @uuid: me client uuid
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*
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* Return: me client or NULL if not found
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*
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* Locking: dev->me_clients_rwsem
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*/
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static struct mei_me_client *__mei_me_cl_by_uuid(struct mei_device *dev,
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const uuid_le *uuid)
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{
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struct mei_me_client *me_cl;
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const uuid_le *pn;
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WARN_ON(!rwsem_is_locked(&dev->me_clients_rwsem));
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list_for_each_entry(me_cl, &dev->me_clients, list) {
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pn = &me_cl->props.protocol_name;
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if (uuid_le_cmp(*uuid, *pn) == 0)
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return mei_me_cl_get(me_cl);
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}
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return NULL;
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}
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/**
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* mei_me_cl_by_uuid - locate me client by uuid
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* increases ref count
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*
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* @dev: mei device
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* @uuid: me client uuid
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*
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* Return: me client or NULL if not found
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*
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* Locking: dev->me_clients_rwsem
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*/
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struct mei_me_client *mei_me_cl_by_uuid(struct mei_device *dev,
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const uuid_le *uuid)
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{
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struct mei_me_client *me_cl;
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down_read(&dev->me_clients_rwsem);
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me_cl = __mei_me_cl_by_uuid(dev, uuid);
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up_read(&dev->me_clients_rwsem);
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return me_cl;
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}
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/**
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* mei_me_cl_by_id - locate me client by client id
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* increases ref count
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*
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* @dev: the device structure
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* @client_id: me client id
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*
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* Return: me client or NULL if not found
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*
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* Locking: dev->me_clients_rwsem
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*/
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struct mei_me_client *mei_me_cl_by_id(struct mei_device *dev, u8 client_id)
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{
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struct mei_me_client *__me_cl, *me_cl = NULL;
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down_read(&dev->me_clients_rwsem);
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list_for_each_entry(__me_cl, &dev->me_clients, list) {
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if (__me_cl->client_id == client_id) {
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me_cl = mei_me_cl_get(__me_cl);
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break;
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}
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}
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up_read(&dev->me_clients_rwsem);
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return me_cl;
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}
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/**
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* __mei_me_cl_by_uuid_id - locate me client by client id and uuid
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* increases ref count
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*
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* @dev: the device structure
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* @uuid: me client uuid
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* @client_id: me client id
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*
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* Return: me client or null if not found
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*
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* Locking: dev->me_clients_rwsem
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*/
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static struct mei_me_client *__mei_me_cl_by_uuid_id(struct mei_device *dev,
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const uuid_le *uuid, u8 client_id)
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{
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struct mei_me_client *me_cl;
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const uuid_le *pn;
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WARN_ON(!rwsem_is_locked(&dev->me_clients_rwsem));
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list_for_each_entry(me_cl, &dev->me_clients, list) {
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pn = &me_cl->props.protocol_name;
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if (uuid_le_cmp(*uuid, *pn) == 0 &&
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me_cl->client_id == client_id)
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return mei_me_cl_get(me_cl);
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}
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return NULL;
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}
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/**
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* mei_me_cl_by_uuid_id - locate me client by client id and uuid
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* increases ref count
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*
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* @dev: the device structure
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* @uuid: me client uuid
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* @client_id: me client id
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*
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* Return: me client or null if not found
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*/
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struct mei_me_client *mei_me_cl_by_uuid_id(struct mei_device *dev,
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const uuid_le *uuid, u8 client_id)
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{
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struct mei_me_client *me_cl;
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down_read(&dev->me_clients_rwsem);
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me_cl = __mei_me_cl_by_uuid_id(dev, uuid, client_id);
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up_read(&dev->me_clients_rwsem);
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return me_cl;
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}
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/**
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* mei_me_cl_rm_by_uuid - remove all me clients matching uuid
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*
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* @dev: the device structure
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* @uuid: me client uuid
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*
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* Locking: called under "dev->device_lock" lock
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*/
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void mei_me_cl_rm_by_uuid(struct mei_device *dev, const uuid_le *uuid)
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{
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struct mei_me_client *me_cl;
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dev_dbg(dev->dev, "remove %pUl\n", uuid);
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down_write(&dev->me_clients_rwsem);
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me_cl = __mei_me_cl_by_uuid(dev, uuid);
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__mei_me_cl_del(dev, me_cl);
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up_write(&dev->me_clients_rwsem);
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}
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/**
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* mei_me_cl_rm_by_uuid_id - remove all me clients matching client id
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*
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* @dev: the device structure
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* @uuid: me client uuid
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* @id: me client id
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*
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* Locking: called under "dev->device_lock" lock
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*/
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void mei_me_cl_rm_by_uuid_id(struct mei_device *dev, const uuid_le *uuid, u8 id)
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{
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struct mei_me_client *me_cl;
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dev_dbg(dev->dev, "remove %pUl %d\n", uuid, id);
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down_write(&dev->me_clients_rwsem);
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me_cl = __mei_me_cl_by_uuid_id(dev, uuid, id);
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__mei_me_cl_del(dev, me_cl);
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up_write(&dev->me_clients_rwsem);
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}
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/**
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* mei_me_cl_rm_all - remove all me clients
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*
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* @dev: the device structure
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*
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* Locking: called under "dev->device_lock" lock
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*/
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void mei_me_cl_rm_all(struct mei_device *dev)
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{
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struct mei_me_client *me_cl, *next;
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down_write(&dev->me_clients_rwsem);
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list_for_each_entry_safe(me_cl, next, &dev->me_clients, list)
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__mei_me_cl_del(dev, me_cl);
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up_write(&dev->me_clients_rwsem);
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}
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/**
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* mei_cl_cmp_id - tells if the clients are the same
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*
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* @cl1: host client 1
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* @cl2: host client 2
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*
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* Return: true - if the clients has same host and me ids
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* false - otherwise
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*/
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static inline bool mei_cl_cmp_id(const struct mei_cl *cl1,
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const struct mei_cl *cl2)
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{
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return cl1 && cl2 &&
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(cl1->host_client_id == cl2->host_client_id) &&
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(mei_cl_me_id(cl1) == mei_cl_me_id(cl2));
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}
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/**
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* mei_io_cb_free - free mei_cb_private related memory
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*
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* @cb: mei callback struct
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*/
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void mei_io_cb_free(struct mei_cl_cb *cb)
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{
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if (cb == NULL)
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return;
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list_del(&cb->list);
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kfree(cb->buf.data);
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kfree(cb);
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}
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/**
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* mei_io_cb_init - allocate and initialize io callback
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*
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* @cl: mei client
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* @type: operation type
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* @fp: pointer to file structure
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*
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* Return: mei_cl_cb pointer or NULL;
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*/
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static struct mei_cl_cb *mei_io_cb_init(struct mei_cl *cl,
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enum mei_cb_file_ops type,
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const struct file *fp)
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{
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struct mei_cl_cb *cb;
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cb = kzalloc(sizeof(struct mei_cl_cb), GFP_KERNEL);
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if (!cb)
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return NULL;
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INIT_LIST_HEAD(&cb->list);
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cb->fp = fp;
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cb->cl = cl;
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cb->buf_idx = 0;
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cb->fop_type = type;
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return cb;
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}
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/**
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* __mei_io_list_flush_cl - removes and frees cbs belonging to cl.
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*
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* @head: an instance of our list structure
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* @cl: host client, can be NULL for flushing the whole list
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* @free: whether to free the cbs
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*/
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static void __mei_io_list_flush_cl(struct list_head *head,
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const struct mei_cl *cl, bool free)
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{
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struct mei_cl_cb *cb, *next;
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/* enable removing everything if no cl is specified */
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list_for_each_entry_safe(cb, next, head, list) {
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if (!cl || mei_cl_cmp_id(cl, cb->cl)) {
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list_del_init(&cb->list);
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if (free)
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mei_io_cb_free(cb);
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}
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}
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}
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/**
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* mei_io_list_flush_cl - removes list entry belonging to cl.
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*
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* @head: An instance of our list structure
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* @cl: host client
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*/
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static inline void mei_io_list_flush_cl(struct list_head *head,
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const struct mei_cl *cl)
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{
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__mei_io_list_flush_cl(head, cl, false);
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}
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/**
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* mei_io_list_free_cl - removes cb belonging to cl and free them
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*
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* @head: An instance of our list structure
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* @cl: host client
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*/
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static inline void mei_io_list_free_cl(struct list_head *head,
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const struct mei_cl *cl)
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{
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__mei_io_list_flush_cl(head, cl, true);
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}
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/**
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* mei_io_list_free_fp - free cb from a list that matches file pointer
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*
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* @head: io list
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* @fp: file pointer (matching cb file object), may be NULL
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*/
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static void mei_io_list_free_fp(struct list_head *head, const struct file *fp)
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{
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struct mei_cl_cb *cb, *next;
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list_for_each_entry_safe(cb, next, head, list)
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if (!fp || fp == cb->fp)
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mei_io_cb_free(cb);
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}
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/**
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* mei_cl_alloc_cb - a convenient wrapper for allocating read cb
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*
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* @cl: host client
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* @length: size of the buffer
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* @fop_type: operation type
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* @fp: associated file pointer (might be NULL)
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*
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* Return: cb on success and NULL on failure
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*/
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struct mei_cl_cb *mei_cl_alloc_cb(struct mei_cl *cl, size_t length,
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enum mei_cb_file_ops fop_type,
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const struct file *fp)
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{
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struct mei_cl_cb *cb;
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cb = mei_io_cb_init(cl, fop_type, fp);
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if (!cb)
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return NULL;
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if (length == 0)
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return cb;
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cb->buf.data = kmalloc(length, GFP_KERNEL);
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if (!cb->buf.data) {
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mei_io_cb_free(cb);
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return NULL;
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}
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cb->buf.size = length;
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return cb;
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}
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/**
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* mei_cl_enqueue_ctrl_wr_cb - a convenient wrapper for allocating
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* and enqueuing of the control commands cb
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*
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* @cl: host client
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* @length: size of the buffer
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* @fop_type: operation type
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* @fp: associated file pointer (might be NULL)
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*
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* Return: cb on success and NULL on failure
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* Locking: called under "dev->device_lock" lock
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*/
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struct mei_cl_cb *mei_cl_enqueue_ctrl_wr_cb(struct mei_cl *cl, size_t length,
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enum mei_cb_file_ops fop_type,
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const struct file *fp)
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{
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struct mei_cl_cb *cb;
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/* for RX always allocate at least client's mtu */
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if (length)
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length = max_t(size_t, length, mei_cl_mtu(cl));
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cb = mei_cl_alloc_cb(cl, length, fop_type, fp);
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if (!cb)
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return NULL;
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list_add_tail(&cb->list, &cl->dev->ctrl_wr_list);
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return cb;
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}
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/**
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* mei_cl_read_cb - find this cl's callback in the read list
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* for a specific file
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*
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* @cl: host client
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* @fp: file pointer (matching cb file object), may be NULL
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*
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* Return: cb on success, NULL if cb is not found
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*/
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struct mei_cl_cb *mei_cl_read_cb(const struct mei_cl *cl, const struct file *fp)
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{
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struct mei_cl_cb *cb;
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|
|
list_for_each_entry(cb, &cl->rd_completed, list)
|
|
if (!fp || fp == cb->fp)
|
|
return cb;
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/**
|
|
* mei_cl_flush_queues - flushes queue lists belonging to cl.
|
|
*
|
|
* @cl: host client
|
|
* @fp: file pointer (matching cb file object), may be NULL
|
|
*
|
|
* Return: 0 on success, -EINVAL if cl or cl->dev is NULL.
|
|
*/
|
|
int mei_cl_flush_queues(struct mei_cl *cl, const struct file *fp)
|
|
{
|
|
struct mei_device *dev;
|
|
|
|
if (WARN_ON(!cl || !cl->dev))
|
|
return -EINVAL;
|
|
|
|
dev = cl->dev;
|
|
|
|
cl_dbg(dev, cl, "remove list entry belonging to cl\n");
|
|
mei_io_list_free_cl(&cl->dev->write_list, cl);
|
|
mei_io_list_free_cl(&cl->dev->write_waiting_list, cl);
|
|
mei_io_list_flush_cl(&cl->dev->ctrl_wr_list, cl);
|
|
mei_io_list_flush_cl(&cl->dev->ctrl_rd_list, cl);
|
|
mei_io_list_free_fp(&cl->rd_pending, fp);
|
|
mei_io_list_free_fp(&cl->rd_completed, fp);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* mei_cl_init - initializes cl.
|
|
*
|
|
* @cl: host client to be initialized
|
|
* @dev: mei device
|
|
*/
|
|
static void mei_cl_init(struct mei_cl *cl, struct mei_device *dev)
|
|
{
|
|
memset(cl, 0, sizeof(struct mei_cl));
|
|
init_waitqueue_head(&cl->wait);
|
|
init_waitqueue_head(&cl->rx_wait);
|
|
init_waitqueue_head(&cl->tx_wait);
|
|
init_waitqueue_head(&cl->ev_wait);
|
|
INIT_LIST_HEAD(&cl->rd_completed);
|
|
INIT_LIST_HEAD(&cl->rd_pending);
|
|
INIT_LIST_HEAD(&cl->link);
|
|
cl->writing_state = MEI_IDLE;
|
|
cl->state = MEI_FILE_UNINITIALIZED;
|
|
cl->dev = dev;
|
|
}
|
|
|
|
/**
|
|
* mei_cl_allocate - allocates cl structure and sets it up.
|
|
*
|
|
* @dev: mei device
|
|
* Return: The allocated file or NULL on failure
|
|
*/
|
|
struct mei_cl *mei_cl_allocate(struct mei_device *dev)
|
|
{
|
|
struct mei_cl *cl;
|
|
|
|
cl = kmalloc(sizeof(struct mei_cl), GFP_KERNEL);
|
|
if (!cl)
|
|
return NULL;
|
|
|
|
mei_cl_init(cl, dev);
|
|
|
|
return cl;
|
|
}
|
|
|
|
/**
|
|
* mei_cl_link - allocate host id in the host map
|
|
*
|
|
* @cl: host client
|
|
*
|
|
* Return: 0 on success
|
|
* -EINVAL on incorrect values
|
|
* -EMFILE if open count exceeded.
|
|
*/
|
|
int mei_cl_link(struct mei_cl *cl)
|
|
{
|
|
struct mei_device *dev;
|
|
int id;
|
|
|
|
if (WARN_ON(!cl || !cl->dev))
|
|
return -EINVAL;
|
|
|
|
dev = cl->dev;
|
|
|
|
id = find_first_zero_bit(dev->host_clients_map, MEI_CLIENTS_MAX);
|
|
if (id >= MEI_CLIENTS_MAX) {
|
|
dev_err(dev->dev, "id exceeded %d", MEI_CLIENTS_MAX);
|
|
return -EMFILE;
|
|
}
|
|
|
|
if (dev->open_handle_count >= MEI_MAX_OPEN_HANDLE_COUNT) {
|
|
dev_err(dev->dev, "open_handle_count exceeded %d",
|
|
MEI_MAX_OPEN_HANDLE_COUNT);
|
|
return -EMFILE;
|
|
}
|
|
|
|
dev->open_handle_count++;
|
|
|
|
cl->host_client_id = id;
|
|
list_add_tail(&cl->link, &dev->file_list);
|
|
|
|
set_bit(id, dev->host_clients_map);
|
|
|
|
cl->state = MEI_FILE_INITIALIZING;
|
|
|
|
cl_dbg(dev, cl, "link cl\n");
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* mei_cl_unlink - remove host client from the list
|
|
*
|
|
* @cl: host client
|
|
*
|
|
* Return: always 0
|
|
*/
|
|
int mei_cl_unlink(struct mei_cl *cl)
|
|
{
|
|
struct mei_device *dev;
|
|
|
|
/* don't shout on error exit path */
|
|
if (!cl)
|
|
return 0;
|
|
|
|
if (WARN_ON(!cl->dev))
|
|
return 0;
|
|
|
|
dev = cl->dev;
|
|
|
|
cl_dbg(dev, cl, "unlink client");
|
|
|
|
if (dev->open_handle_count > 0)
|
|
dev->open_handle_count--;
|
|
|
|
/* never clear the 0 bit */
|
|
if (cl->host_client_id)
|
|
clear_bit(cl->host_client_id, dev->host_clients_map);
|
|
|
|
list_del_init(&cl->link);
|
|
|
|
cl->state = MEI_FILE_UNINITIALIZED;
|
|
cl->writing_state = MEI_IDLE;
|
|
|
|
WARN_ON(!list_empty(&cl->rd_completed) ||
|
|
!list_empty(&cl->rd_pending) ||
|
|
!list_empty(&cl->link));
|
|
|
|
return 0;
|
|
}
|
|
|
|
void mei_host_client_init(struct mei_device *dev)
|
|
{
|
|
dev->dev_state = MEI_DEV_ENABLED;
|
|
dev->reset_count = 0;
|
|
|
|
schedule_work(&dev->bus_rescan_work);
|
|
|
|
pm_runtime_mark_last_busy(dev->dev);
|
|
dev_dbg(dev->dev, "rpm: autosuspend\n");
|
|
pm_request_autosuspend(dev->dev);
|
|
}
|
|
|
|
/**
|
|
* mei_hbuf_acquire - try to acquire host buffer
|
|
*
|
|
* @dev: the device structure
|
|
* Return: true if host buffer was acquired
|
|
*/
|
|
bool mei_hbuf_acquire(struct mei_device *dev)
|
|
{
|
|
if (mei_pg_state(dev) == MEI_PG_ON ||
|
|
mei_pg_in_transition(dev)) {
|
|
dev_dbg(dev->dev, "device is in pg\n");
|
|
return false;
|
|
}
|
|
|
|
if (!dev->hbuf_is_ready) {
|
|
dev_dbg(dev->dev, "hbuf is not ready\n");
|
|
return false;
|
|
}
|
|
|
|
dev->hbuf_is_ready = false;
|
|
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* mei_cl_wake_all - wake up readers, writers and event waiters so
|
|
* they can be interrupted
|
|
*
|
|
* @cl: host client
|
|
*/
|
|
static void mei_cl_wake_all(struct mei_cl *cl)
|
|
{
|
|
struct mei_device *dev = cl->dev;
|
|
|
|
/* synchronized under device mutex */
|
|
if (waitqueue_active(&cl->rx_wait)) {
|
|
cl_dbg(dev, cl, "Waking up reading client!\n");
|
|
wake_up_interruptible(&cl->rx_wait);
|
|
}
|
|
/* synchronized under device mutex */
|
|
if (waitqueue_active(&cl->tx_wait)) {
|
|
cl_dbg(dev, cl, "Waking up writing client!\n");
|
|
wake_up_interruptible(&cl->tx_wait);
|
|
}
|
|
/* synchronized under device mutex */
|
|
if (waitqueue_active(&cl->ev_wait)) {
|
|
cl_dbg(dev, cl, "Waking up waiting for event clients!\n");
|
|
wake_up_interruptible(&cl->ev_wait);
|
|
}
|
|
/* synchronized under device mutex */
|
|
if (waitqueue_active(&cl->wait)) {
|
|
cl_dbg(dev, cl, "Waking up ctrl write clients!\n");
|
|
wake_up(&cl->wait);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* mei_cl_set_disconnected - set disconnected state and clear
|
|
* associated states and resources
|
|
*
|
|
* @cl: host client
|
|
*/
|
|
static void mei_cl_set_disconnected(struct mei_cl *cl)
|
|
{
|
|
struct mei_device *dev = cl->dev;
|
|
|
|
if (cl->state == MEI_FILE_DISCONNECTED ||
|
|
cl->state <= MEI_FILE_INITIALIZING)
|
|
return;
|
|
|
|
cl->state = MEI_FILE_DISCONNECTED;
|
|
mei_io_list_free_cl(&dev->write_list, cl);
|
|
mei_io_list_free_cl(&dev->write_waiting_list, cl);
|
|
mei_io_list_flush_cl(&dev->ctrl_rd_list, cl);
|
|
mei_io_list_flush_cl(&dev->ctrl_wr_list, cl);
|
|
mei_cl_wake_all(cl);
|
|
cl->rx_flow_ctrl_creds = 0;
|
|
cl->tx_flow_ctrl_creds = 0;
|
|
cl->timer_count = 0;
|
|
|
|
mei_cl_bus_module_put(cl);
|
|
|
|
if (!cl->me_cl)
|
|
return;
|
|
|
|
if (!WARN_ON(cl->me_cl->connect_count == 0))
|
|
cl->me_cl->connect_count--;
|
|
|
|
if (cl->me_cl->connect_count == 0)
|
|
cl->me_cl->tx_flow_ctrl_creds = 0;
|
|
|
|
mei_me_cl_put(cl->me_cl);
|
|
cl->me_cl = NULL;
|
|
}
|
|
|
|
static int mei_cl_set_connecting(struct mei_cl *cl, struct mei_me_client *me_cl)
|
|
{
|
|
if (!mei_me_cl_get(me_cl))
|
|
return -ENOENT;
|
|
|
|
/* only one connection is allowed for fixed address clients */
|
|
if (me_cl->props.fixed_address) {
|
|
if (me_cl->connect_count) {
|
|
mei_me_cl_put(me_cl);
|
|
return -EBUSY;
|
|
}
|
|
}
|
|
|
|
cl->me_cl = me_cl;
|
|
cl->state = MEI_FILE_CONNECTING;
|
|
cl->me_cl->connect_count++;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* mei_cl_send_disconnect - send disconnect request
|
|
*
|
|
* @cl: host client
|
|
* @cb: callback block
|
|
*
|
|
* Return: 0, OK; otherwise, error.
|
|
*/
|
|
static int mei_cl_send_disconnect(struct mei_cl *cl, struct mei_cl_cb *cb)
|
|
{
|
|
struct mei_device *dev;
|
|
int ret;
|
|
|
|
dev = cl->dev;
|
|
|
|
ret = mei_hbm_cl_disconnect_req(dev, cl);
|
|
cl->status = ret;
|
|
if (ret) {
|
|
cl->state = MEI_FILE_DISCONNECT_REPLY;
|
|
return ret;
|
|
}
|
|
|
|
list_move_tail(&cb->list, &dev->ctrl_rd_list);
|
|
cl->timer_count = MEI_CONNECT_TIMEOUT;
|
|
mei_schedule_stall_timer(dev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* mei_cl_irq_disconnect - processes close related operation from
|
|
* interrupt thread context - send disconnect request
|
|
*
|
|
* @cl: client
|
|
* @cb: callback block.
|
|
* @cmpl_list: complete list.
|
|
*
|
|
* Return: 0, OK; otherwise, error.
|
|
*/
|
|
int mei_cl_irq_disconnect(struct mei_cl *cl, struct mei_cl_cb *cb,
|
|
struct list_head *cmpl_list)
|
|
{
|
|
struct mei_device *dev = cl->dev;
|
|
u32 msg_slots;
|
|
int slots;
|
|
int ret;
|
|
|
|
msg_slots = mei_data2slots(sizeof(struct hbm_client_connect_request));
|
|
slots = mei_hbuf_empty_slots(dev);
|
|
|
|
if (slots < msg_slots)
|
|
return -EMSGSIZE;
|
|
|
|
ret = mei_cl_send_disconnect(cl, cb);
|
|
if (ret)
|
|
list_move_tail(&cb->list, cmpl_list);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* __mei_cl_disconnect - disconnect host client from the me one
|
|
* internal function runtime pm has to be already acquired
|
|
*
|
|
* @cl: host client
|
|
*
|
|
* Return: 0 on success, <0 on failure.
|
|
*/
|
|
static int __mei_cl_disconnect(struct mei_cl *cl)
|
|
{
|
|
struct mei_device *dev;
|
|
struct mei_cl_cb *cb;
|
|
int rets;
|
|
|
|
dev = cl->dev;
|
|
|
|
cl->state = MEI_FILE_DISCONNECTING;
|
|
|
|
cb = mei_cl_enqueue_ctrl_wr_cb(cl, 0, MEI_FOP_DISCONNECT, NULL);
|
|
if (!cb) {
|
|
rets = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
if (mei_hbuf_acquire(dev)) {
|
|
rets = mei_cl_send_disconnect(cl, cb);
|
|
if (rets) {
|
|
cl_err(dev, cl, "failed to disconnect.\n");
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
mutex_unlock(&dev->device_lock);
|
|
wait_event_timeout(cl->wait,
|
|
cl->state == MEI_FILE_DISCONNECT_REPLY ||
|
|
cl->state == MEI_FILE_DISCONNECTED,
|
|
mei_secs_to_jiffies(MEI_CL_CONNECT_TIMEOUT));
|
|
mutex_lock(&dev->device_lock);
|
|
|
|
rets = cl->status;
|
|
if (cl->state != MEI_FILE_DISCONNECT_REPLY &&
|
|
cl->state != MEI_FILE_DISCONNECTED) {
|
|
cl_dbg(dev, cl, "timeout on disconnect from FW client.\n");
|
|
rets = -ETIME;
|
|
}
|
|
|
|
out:
|
|
/* we disconnect also on error */
|
|
mei_cl_set_disconnected(cl);
|
|
if (!rets)
|
|
cl_dbg(dev, cl, "successfully disconnected from FW client.\n");
|
|
|
|
mei_io_cb_free(cb);
|
|
return rets;
|
|
}
|
|
|
|
/**
|
|
* mei_cl_disconnect - disconnect host client from the me one
|
|
*
|
|
* @cl: host client
|
|
*
|
|
* Locking: called under "dev->device_lock" lock
|
|
*
|
|
* Return: 0 on success, <0 on failure.
|
|
*/
|
|
int mei_cl_disconnect(struct mei_cl *cl)
|
|
{
|
|
struct mei_device *dev;
|
|
int rets;
|
|
|
|
if (WARN_ON(!cl || !cl->dev))
|
|
return -ENODEV;
|
|
|
|
dev = cl->dev;
|
|
|
|
cl_dbg(dev, cl, "disconnecting");
|
|
|
|
if (!mei_cl_is_connected(cl))
|
|
return 0;
|
|
|
|
if (mei_cl_is_fixed_address(cl)) {
|
|
mei_cl_set_disconnected(cl);
|
|
return 0;
|
|
}
|
|
|
|
rets = pm_runtime_get(dev->dev);
|
|
if (rets < 0 && rets != -EINPROGRESS) {
|
|
pm_runtime_put_noidle(dev->dev);
|
|
cl_err(dev, cl, "rpm: get failed %d\n", rets);
|
|
return rets;
|
|
}
|
|
|
|
rets = __mei_cl_disconnect(cl);
|
|
|
|
cl_dbg(dev, cl, "rpm: autosuspend\n");
|
|
pm_runtime_mark_last_busy(dev->dev);
|
|
pm_runtime_put_autosuspend(dev->dev);
|
|
|
|
return rets;
|
|
}
|
|
|
|
|
|
/**
|
|
* mei_cl_is_other_connecting - checks if other
|
|
* client with the same me client id is connecting
|
|
*
|
|
* @cl: private data of the file object
|
|
*
|
|
* Return: true if other client is connected, false - otherwise.
|
|
*/
|
|
static bool mei_cl_is_other_connecting(struct mei_cl *cl)
|
|
{
|
|
struct mei_device *dev;
|
|
struct mei_cl_cb *cb;
|
|
|
|
dev = cl->dev;
|
|
|
|
list_for_each_entry(cb, &dev->ctrl_rd_list, list) {
|
|
if (cb->fop_type == MEI_FOP_CONNECT &&
|
|
mei_cl_me_id(cl) == mei_cl_me_id(cb->cl))
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* mei_cl_send_connect - send connect request
|
|
*
|
|
* @cl: host client
|
|
* @cb: callback block
|
|
*
|
|
* Return: 0, OK; otherwise, error.
|
|
*/
|
|
static int mei_cl_send_connect(struct mei_cl *cl, struct mei_cl_cb *cb)
|
|
{
|
|
struct mei_device *dev;
|
|
int ret;
|
|
|
|
dev = cl->dev;
|
|
|
|
ret = mei_hbm_cl_connect_req(dev, cl);
|
|
cl->status = ret;
|
|
if (ret) {
|
|
cl->state = MEI_FILE_DISCONNECT_REPLY;
|
|
return ret;
|
|
}
|
|
|
|
list_move_tail(&cb->list, &dev->ctrl_rd_list);
|
|
cl->timer_count = MEI_CONNECT_TIMEOUT;
|
|
mei_schedule_stall_timer(dev);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* mei_cl_irq_connect - send connect request in irq_thread context
|
|
*
|
|
* @cl: host client
|
|
* @cb: callback block
|
|
* @cmpl_list: complete list
|
|
*
|
|
* Return: 0, OK; otherwise, error.
|
|
*/
|
|
int mei_cl_irq_connect(struct mei_cl *cl, struct mei_cl_cb *cb,
|
|
struct list_head *cmpl_list)
|
|
{
|
|
struct mei_device *dev = cl->dev;
|
|
u32 msg_slots;
|
|
int slots;
|
|
int rets;
|
|
|
|
msg_slots = mei_data2slots(sizeof(struct hbm_client_connect_request));
|
|
slots = mei_hbuf_empty_slots(dev);
|
|
|
|
if (mei_cl_is_other_connecting(cl))
|
|
return 0;
|
|
|
|
if (slots < msg_slots)
|
|
return -EMSGSIZE;
|
|
|
|
rets = mei_cl_send_connect(cl, cb);
|
|
if (rets)
|
|
list_move_tail(&cb->list, cmpl_list);
|
|
|
|
return rets;
|
|
}
|
|
|
|
/**
|
|
* mei_cl_connect - connect host client to the me one
|
|
*
|
|
* @cl: host client
|
|
* @me_cl: me client
|
|
* @fp: pointer to file structure
|
|
*
|
|
* Locking: called under "dev->device_lock" lock
|
|
*
|
|
* Return: 0 on success, <0 on failure.
|
|
*/
|
|
int mei_cl_connect(struct mei_cl *cl, struct mei_me_client *me_cl,
|
|
const struct file *fp)
|
|
{
|
|
struct mei_device *dev;
|
|
struct mei_cl_cb *cb;
|
|
int rets;
|
|
|
|
if (WARN_ON(!cl || !cl->dev || !me_cl))
|
|
return -ENODEV;
|
|
|
|
dev = cl->dev;
|
|
|
|
if (!mei_cl_bus_module_get(cl))
|
|
return -ENODEV;
|
|
|
|
rets = mei_cl_set_connecting(cl, me_cl);
|
|
if (rets)
|
|
goto nortpm;
|
|
|
|
if (mei_cl_is_fixed_address(cl)) {
|
|
cl->state = MEI_FILE_CONNECTED;
|
|
rets = 0;
|
|
goto nortpm;
|
|
}
|
|
|
|
rets = pm_runtime_get(dev->dev);
|
|
if (rets < 0 && rets != -EINPROGRESS) {
|
|
pm_runtime_put_noidle(dev->dev);
|
|
cl_err(dev, cl, "rpm: get failed %d\n", rets);
|
|
goto nortpm;
|
|
}
|
|
|
|
cb = mei_cl_enqueue_ctrl_wr_cb(cl, 0, MEI_FOP_CONNECT, fp);
|
|
if (!cb) {
|
|
rets = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
/* run hbuf acquire last so we don't have to undo */
|
|
if (!mei_cl_is_other_connecting(cl) && mei_hbuf_acquire(dev)) {
|
|
rets = mei_cl_send_connect(cl, cb);
|
|
if (rets)
|
|
goto out;
|
|
}
|
|
|
|
mutex_unlock(&dev->device_lock);
|
|
wait_event_timeout(cl->wait,
|
|
(cl->state == MEI_FILE_CONNECTED ||
|
|
cl->state == MEI_FILE_DISCONNECTED ||
|
|
cl->state == MEI_FILE_DISCONNECT_REQUIRED ||
|
|
cl->state == MEI_FILE_DISCONNECT_REPLY),
|
|
mei_secs_to_jiffies(MEI_CL_CONNECT_TIMEOUT));
|
|
mutex_lock(&dev->device_lock);
|
|
|
|
if (!mei_cl_is_connected(cl)) {
|
|
if (cl->state == MEI_FILE_DISCONNECT_REQUIRED) {
|
|
mei_io_list_flush_cl(&dev->ctrl_rd_list, cl);
|
|
mei_io_list_flush_cl(&dev->ctrl_wr_list, cl);
|
|
/* ignore disconnect return valuue;
|
|
* in case of failure reset will be invoked
|
|
*/
|
|
__mei_cl_disconnect(cl);
|
|
rets = -EFAULT;
|
|
goto out;
|
|
}
|
|
|
|
/* timeout or something went really wrong */
|
|
if (!cl->status)
|
|
cl->status = -EFAULT;
|
|
}
|
|
|
|
rets = cl->status;
|
|
out:
|
|
cl_dbg(dev, cl, "rpm: autosuspend\n");
|
|
pm_runtime_mark_last_busy(dev->dev);
|
|
pm_runtime_put_autosuspend(dev->dev);
|
|
|
|
mei_io_cb_free(cb);
|
|
|
|
nortpm:
|
|
if (!mei_cl_is_connected(cl))
|
|
mei_cl_set_disconnected(cl);
|
|
|
|
return rets;
|
|
}
|
|
|
|
/**
|
|
* mei_cl_alloc_linked - allocate and link host client
|
|
*
|
|
* @dev: the device structure
|
|
*
|
|
* Return: cl on success ERR_PTR on failure
|
|
*/
|
|
struct mei_cl *mei_cl_alloc_linked(struct mei_device *dev)
|
|
{
|
|
struct mei_cl *cl;
|
|
int ret;
|
|
|
|
cl = mei_cl_allocate(dev);
|
|
if (!cl) {
|
|
ret = -ENOMEM;
|
|
goto err;
|
|
}
|
|
|
|
ret = mei_cl_link(cl);
|
|
if (ret)
|
|
goto err;
|
|
|
|
return cl;
|
|
err:
|
|
kfree(cl);
|
|
return ERR_PTR(ret);
|
|
}
|
|
|
|
/**
|
|
* mei_cl_tx_flow_ctrl_creds - checks flow_control credits for cl.
|
|
*
|
|
* @cl: host client
|
|
*
|
|
* Return: 1 if tx_flow_ctrl_creds >0, 0 - otherwise.
|
|
*/
|
|
static int mei_cl_tx_flow_ctrl_creds(struct mei_cl *cl)
|
|
{
|
|
if (WARN_ON(!cl || !cl->me_cl))
|
|
return -EINVAL;
|
|
|
|
if (cl->tx_flow_ctrl_creds > 0)
|
|
return 1;
|
|
|
|
if (mei_cl_is_fixed_address(cl))
|
|
return 1;
|
|
|
|
if (mei_cl_is_single_recv_buf(cl)) {
|
|
if (cl->me_cl->tx_flow_ctrl_creds > 0)
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* mei_cl_tx_flow_ctrl_creds_reduce - reduces transmit flow control credits
|
|
* for a client
|
|
*
|
|
* @cl: host client
|
|
*
|
|
* Return:
|
|
* 0 on success
|
|
* -EINVAL when ctrl credits are <= 0
|
|
*/
|
|
static int mei_cl_tx_flow_ctrl_creds_reduce(struct mei_cl *cl)
|
|
{
|
|
if (WARN_ON(!cl || !cl->me_cl))
|
|
return -EINVAL;
|
|
|
|
if (mei_cl_is_fixed_address(cl))
|
|
return 0;
|
|
|
|
if (mei_cl_is_single_recv_buf(cl)) {
|
|
if (WARN_ON(cl->me_cl->tx_flow_ctrl_creds <= 0))
|
|
return -EINVAL;
|
|
cl->me_cl->tx_flow_ctrl_creds--;
|
|
} else {
|
|
if (WARN_ON(cl->tx_flow_ctrl_creds <= 0))
|
|
return -EINVAL;
|
|
cl->tx_flow_ctrl_creds--;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* mei_cl_notify_fop2req - convert fop to proper request
|
|
*
|
|
* @fop: client notification start response command
|
|
*
|
|
* Return: MEI_HBM_NOTIFICATION_START/STOP
|
|
*/
|
|
u8 mei_cl_notify_fop2req(enum mei_cb_file_ops fop)
|
|
{
|
|
if (fop == MEI_FOP_NOTIFY_START)
|
|
return MEI_HBM_NOTIFICATION_START;
|
|
else
|
|
return MEI_HBM_NOTIFICATION_STOP;
|
|
}
|
|
|
|
/**
|
|
* mei_cl_notify_req2fop - convert notification request top file operation type
|
|
*
|
|
* @req: hbm notification request type
|
|
*
|
|
* Return: MEI_FOP_NOTIFY_START/STOP
|
|
*/
|
|
enum mei_cb_file_ops mei_cl_notify_req2fop(u8 req)
|
|
{
|
|
if (req == MEI_HBM_NOTIFICATION_START)
|
|
return MEI_FOP_NOTIFY_START;
|
|
else
|
|
return MEI_FOP_NOTIFY_STOP;
|
|
}
|
|
|
|
/**
|
|
* mei_cl_irq_notify - send notification request in irq_thread context
|
|
*
|
|
* @cl: client
|
|
* @cb: callback block.
|
|
* @cmpl_list: complete list.
|
|
*
|
|
* Return: 0 on such and error otherwise.
|
|
*/
|
|
int mei_cl_irq_notify(struct mei_cl *cl, struct mei_cl_cb *cb,
|
|
struct list_head *cmpl_list)
|
|
{
|
|
struct mei_device *dev = cl->dev;
|
|
u32 msg_slots;
|
|
int slots;
|
|
int ret;
|
|
bool request;
|
|
|
|
msg_slots = mei_data2slots(sizeof(struct hbm_client_connect_request));
|
|
slots = mei_hbuf_empty_slots(dev);
|
|
|
|
if (slots < msg_slots)
|
|
return -EMSGSIZE;
|
|
|
|
request = mei_cl_notify_fop2req(cb->fop_type);
|
|
ret = mei_hbm_cl_notify_req(dev, cl, request);
|
|
if (ret) {
|
|
cl->status = ret;
|
|
list_move_tail(&cb->list, cmpl_list);
|
|
return ret;
|
|
}
|
|
|
|
list_move_tail(&cb->list, &dev->ctrl_rd_list);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* mei_cl_notify_request - send notification stop/start request
|
|
*
|
|
* @cl: host client
|
|
* @fp: associate request with file
|
|
* @request: 1 for start or 0 for stop
|
|
*
|
|
* Locking: called under "dev->device_lock" lock
|
|
*
|
|
* Return: 0 on such and error otherwise.
|
|
*/
|
|
int mei_cl_notify_request(struct mei_cl *cl,
|
|
const struct file *fp, u8 request)
|
|
{
|
|
struct mei_device *dev;
|
|
struct mei_cl_cb *cb;
|
|
enum mei_cb_file_ops fop_type;
|
|
int rets;
|
|
|
|
if (WARN_ON(!cl || !cl->dev))
|
|
return -ENODEV;
|
|
|
|
dev = cl->dev;
|
|
|
|
if (!dev->hbm_f_ev_supported) {
|
|
cl_dbg(dev, cl, "notifications not supported\n");
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
if (!mei_cl_is_connected(cl))
|
|
return -ENODEV;
|
|
|
|
rets = pm_runtime_get(dev->dev);
|
|
if (rets < 0 && rets != -EINPROGRESS) {
|
|
pm_runtime_put_noidle(dev->dev);
|
|
cl_err(dev, cl, "rpm: get failed %d\n", rets);
|
|
return rets;
|
|
}
|
|
|
|
fop_type = mei_cl_notify_req2fop(request);
|
|
cb = mei_cl_enqueue_ctrl_wr_cb(cl, 0, fop_type, fp);
|
|
if (!cb) {
|
|
rets = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
if (mei_hbuf_acquire(dev)) {
|
|
if (mei_hbm_cl_notify_req(dev, cl, request)) {
|
|
rets = -ENODEV;
|
|
goto out;
|
|
}
|
|
list_move_tail(&cb->list, &dev->ctrl_rd_list);
|
|
}
|
|
|
|
mutex_unlock(&dev->device_lock);
|
|
wait_event_timeout(cl->wait,
|
|
cl->notify_en == request || !mei_cl_is_connected(cl),
|
|
mei_secs_to_jiffies(MEI_CL_CONNECT_TIMEOUT));
|
|
mutex_lock(&dev->device_lock);
|
|
|
|
if (cl->notify_en != request && !cl->status)
|
|
cl->status = -EFAULT;
|
|
|
|
rets = cl->status;
|
|
|
|
out:
|
|
cl_dbg(dev, cl, "rpm: autosuspend\n");
|
|
pm_runtime_mark_last_busy(dev->dev);
|
|
pm_runtime_put_autosuspend(dev->dev);
|
|
|
|
mei_io_cb_free(cb);
|
|
return rets;
|
|
}
|
|
|
|
/**
|
|
* mei_cl_notify - raise notification
|
|
*
|
|
* @cl: host client
|
|
*
|
|
* Locking: called under "dev->device_lock" lock
|
|
*/
|
|
void mei_cl_notify(struct mei_cl *cl)
|
|
{
|
|
struct mei_device *dev;
|
|
|
|
if (!cl || !cl->dev)
|
|
return;
|
|
|
|
dev = cl->dev;
|
|
|
|
if (!cl->notify_en)
|
|
return;
|
|
|
|
cl_dbg(dev, cl, "notify event");
|
|
cl->notify_ev = true;
|
|
if (!mei_cl_bus_notify_event(cl))
|
|
wake_up_interruptible(&cl->ev_wait);
|
|
|
|
if (cl->ev_async)
|
|
kill_fasync(&cl->ev_async, SIGIO, POLL_PRI);
|
|
|
|
}
|
|
|
|
/**
|
|
* mei_cl_notify_get - get or wait for notification event
|
|
*
|
|
* @cl: host client
|
|
* @block: this request is blocking
|
|
* @notify_ev: true if notification event was received
|
|
*
|
|
* Locking: called under "dev->device_lock" lock
|
|
*
|
|
* Return: 0 on such and error otherwise.
|
|
*/
|
|
int mei_cl_notify_get(struct mei_cl *cl, bool block, bool *notify_ev)
|
|
{
|
|
struct mei_device *dev;
|
|
int rets;
|
|
|
|
*notify_ev = false;
|
|
|
|
if (WARN_ON(!cl || !cl->dev))
|
|
return -ENODEV;
|
|
|
|
dev = cl->dev;
|
|
|
|
if (!dev->hbm_f_ev_supported) {
|
|
cl_dbg(dev, cl, "notifications not supported\n");
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
if (!mei_cl_is_connected(cl))
|
|
return -ENODEV;
|
|
|
|
if (cl->notify_ev)
|
|
goto out;
|
|
|
|
if (!block)
|
|
return -EAGAIN;
|
|
|
|
mutex_unlock(&dev->device_lock);
|
|
rets = wait_event_interruptible(cl->ev_wait, cl->notify_ev);
|
|
mutex_lock(&dev->device_lock);
|
|
|
|
if (rets < 0)
|
|
return rets;
|
|
|
|
out:
|
|
*notify_ev = cl->notify_ev;
|
|
cl->notify_ev = false;
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* mei_cl_read_start - the start read client message function.
|
|
*
|
|
* @cl: host client
|
|
* @length: number of bytes to read
|
|
* @fp: pointer to file structure
|
|
*
|
|
* Return: 0 on success, <0 on failure.
|
|
*/
|
|
int mei_cl_read_start(struct mei_cl *cl, size_t length, const struct file *fp)
|
|
{
|
|
struct mei_device *dev;
|
|
struct mei_cl_cb *cb;
|
|
int rets;
|
|
|
|
if (WARN_ON(!cl || !cl->dev))
|
|
return -ENODEV;
|
|
|
|
dev = cl->dev;
|
|
|
|
if (!mei_cl_is_connected(cl))
|
|
return -ENODEV;
|
|
|
|
if (!mei_me_cl_is_active(cl->me_cl)) {
|
|
cl_err(dev, cl, "no such me client\n");
|
|
return -ENOTTY;
|
|
}
|
|
|
|
if (mei_cl_is_fixed_address(cl))
|
|
return 0;
|
|
|
|
/* HW currently supports only one pending read */
|
|
if (cl->rx_flow_ctrl_creds)
|
|
return -EBUSY;
|
|
|
|
cb = mei_cl_enqueue_ctrl_wr_cb(cl, length, MEI_FOP_READ, fp);
|
|
if (!cb)
|
|
return -ENOMEM;
|
|
|
|
rets = pm_runtime_get(dev->dev);
|
|
if (rets < 0 && rets != -EINPROGRESS) {
|
|
pm_runtime_put_noidle(dev->dev);
|
|
cl_err(dev, cl, "rpm: get failed %d\n", rets);
|
|
goto nortpm;
|
|
}
|
|
|
|
rets = 0;
|
|
if (mei_hbuf_acquire(dev)) {
|
|
rets = mei_hbm_cl_flow_control_req(dev, cl);
|
|
if (rets < 0)
|
|
goto out;
|
|
|
|
list_move_tail(&cb->list, &cl->rd_pending);
|
|
}
|
|
cl->rx_flow_ctrl_creds++;
|
|
|
|
out:
|
|
cl_dbg(dev, cl, "rpm: autosuspend\n");
|
|
pm_runtime_mark_last_busy(dev->dev);
|
|
pm_runtime_put_autosuspend(dev->dev);
|
|
nortpm:
|
|
if (rets)
|
|
mei_io_cb_free(cb);
|
|
|
|
return rets;
|
|
}
|
|
|
|
/**
|
|
* mei_cl_irq_write - write a message to device
|
|
* from the interrupt thread context
|
|
*
|
|
* @cl: client
|
|
* @cb: callback block.
|
|
* @cmpl_list: complete list.
|
|
*
|
|
* Return: 0, OK; otherwise error.
|
|
*/
|
|
int mei_cl_irq_write(struct mei_cl *cl, struct mei_cl_cb *cb,
|
|
struct list_head *cmpl_list)
|
|
{
|
|
struct mei_device *dev;
|
|
struct mei_msg_data *buf;
|
|
struct mei_msg_hdr mei_hdr;
|
|
size_t len;
|
|
u32 msg_slots;
|
|
int slots;
|
|
int rets;
|
|
bool first_chunk;
|
|
|
|
if (WARN_ON(!cl || !cl->dev))
|
|
return -ENODEV;
|
|
|
|
dev = cl->dev;
|
|
|
|
buf = &cb->buf;
|
|
|
|
first_chunk = cb->buf_idx == 0;
|
|
|
|
rets = first_chunk ? mei_cl_tx_flow_ctrl_creds(cl) : 1;
|
|
if (rets < 0)
|
|
goto err;
|
|
|
|
if (rets == 0) {
|
|
cl_dbg(dev, cl, "No flow control credentials: not sending.\n");
|
|
return 0;
|
|
}
|
|
|
|
slots = mei_hbuf_empty_slots(dev);
|
|
len = buf->size - cb->buf_idx;
|
|
msg_slots = mei_data2slots(len);
|
|
|
|
mei_hdr.host_addr = mei_cl_host_addr(cl);
|
|
mei_hdr.me_addr = mei_cl_me_id(cl);
|
|
mei_hdr.reserved = 0;
|
|
mei_hdr.internal = cb->internal;
|
|
|
|
if (slots >= msg_slots) {
|
|
mei_hdr.length = len;
|
|
mei_hdr.msg_complete = 1;
|
|
/* Split the message only if we can write the whole host buffer */
|
|
} else if (slots == dev->hbuf_depth) {
|
|
msg_slots = slots;
|
|
len = (slots * sizeof(u32)) - sizeof(struct mei_msg_hdr);
|
|
mei_hdr.length = len;
|
|
mei_hdr.msg_complete = 0;
|
|
} else {
|
|
/* wait for next time the host buffer is empty */
|
|
return 0;
|
|
}
|
|
|
|
cl_dbg(dev, cl, "buf: size = %zu idx = %zu\n",
|
|
cb->buf.size, cb->buf_idx);
|
|
|
|
rets = mei_write_message(dev, &mei_hdr, buf->data + cb->buf_idx);
|
|
if (rets)
|
|
goto err;
|
|
|
|
cl->status = 0;
|
|
cl->writing_state = MEI_WRITING;
|
|
cb->buf_idx += mei_hdr.length;
|
|
cb->completed = mei_hdr.msg_complete == 1;
|
|
|
|
if (first_chunk) {
|
|
if (mei_cl_tx_flow_ctrl_creds_reduce(cl)) {
|
|
rets = -EIO;
|
|
goto err;
|
|
}
|
|
}
|
|
|
|
if (mei_hdr.msg_complete)
|
|
list_move_tail(&cb->list, &dev->write_waiting_list);
|
|
|
|
return 0;
|
|
|
|
err:
|
|
cl->status = rets;
|
|
list_move_tail(&cb->list, cmpl_list);
|
|
return rets;
|
|
}
|
|
|
|
/**
|
|
* mei_cl_write - submit a write cb to mei device
|
|
* assumes device_lock is locked
|
|
*
|
|
* @cl: host client
|
|
* @cb: write callback with filled data
|
|
*
|
|
* Return: number of bytes sent on success, <0 on failure.
|
|
*/
|
|
int mei_cl_write(struct mei_cl *cl, struct mei_cl_cb *cb)
|
|
{
|
|
struct mei_device *dev;
|
|
struct mei_msg_data *buf;
|
|
struct mei_msg_hdr mei_hdr;
|
|
int size;
|
|
int rets;
|
|
bool blocking;
|
|
|
|
if (WARN_ON(!cl || !cl->dev))
|
|
return -ENODEV;
|
|
|
|
if (WARN_ON(!cb))
|
|
return -EINVAL;
|
|
|
|
dev = cl->dev;
|
|
|
|
buf = &cb->buf;
|
|
size = buf->size;
|
|
blocking = cb->blocking;
|
|
|
|
cl_dbg(dev, cl, "size=%d\n", size);
|
|
|
|
rets = pm_runtime_get(dev->dev);
|
|
if (rets < 0 && rets != -EINPROGRESS) {
|
|
pm_runtime_put_noidle(dev->dev);
|
|
cl_err(dev, cl, "rpm: get failed %d\n", rets);
|
|
goto free;
|
|
}
|
|
|
|
cb->buf_idx = 0;
|
|
cl->writing_state = MEI_IDLE;
|
|
|
|
mei_hdr.host_addr = mei_cl_host_addr(cl);
|
|
mei_hdr.me_addr = mei_cl_me_id(cl);
|
|
mei_hdr.reserved = 0;
|
|
mei_hdr.msg_complete = 0;
|
|
mei_hdr.internal = cb->internal;
|
|
|
|
rets = mei_cl_tx_flow_ctrl_creds(cl);
|
|
if (rets < 0)
|
|
goto err;
|
|
|
|
if (rets == 0) {
|
|
cl_dbg(dev, cl, "No flow control credentials: not sending.\n");
|
|
rets = size;
|
|
goto out;
|
|
}
|
|
if (!mei_hbuf_acquire(dev)) {
|
|
cl_dbg(dev, cl, "Cannot acquire the host buffer: not sending.\n");
|
|
rets = size;
|
|
goto out;
|
|
}
|
|
|
|
/* Check for a maximum length */
|
|
if (size > mei_hbuf_max_len(dev)) {
|
|
mei_hdr.length = mei_hbuf_max_len(dev);
|
|
mei_hdr.msg_complete = 0;
|
|
} else {
|
|
mei_hdr.length = size;
|
|
mei_hdr.msg_complete = 1;
|
|
}
|
|
|
|
rets = mei_write_message(dev, &mei_hdr, buf->data);
|
|
if (rets)
|
|
goto err;
|
|
|
|
rets = mei_cl_tx_flow_ctrl_creds_reduce(cl);
|
|
if (rets)
|
|
goto err;
|
|
|
|
cl->writing_state = MEI_WRITING;
|
|
cb->buf_idx = mei_hdr.length;
|
|
cb->completed = mei_hdr.msg_complete == 1;
|
|
|
|
out:
|
|
if (mei_hdr.msg_complete)
|
|
list_add_tail(&cb->list, &dev->write_waiting_list);
|
|
else
|
|
list_add_tail(&cb->list, &dev->write_list);
|
|
|
|
cb = NULL;
|
|
if (blocking && cl->writing_state != MEI_WRITE_COMPLETE) {
|
|
|
|
mutex_unlock(&dev->device_lock);
|
|
rets = wait_event_interruptible(cl->tx_wait,
|
|
cl->writing_state == MEI_WRITE_COMPLETE ||
|
|
(!mei_cl_is_connected(cl)));
|
|
mutex_lock(&dev->device_lock);
|
|
/* wait_event_interruptible returns -ERESTARTSYS */
|
|
if (rets) {
|
|
if (signal_pending(current))
|
|
rets = -EINTR;
|
|
goto err;
|
|
}
|
|
if (cl->writing_state != MEI_WRITE_COMPLETE) {
|
|
rets = -EFAULT;
|
|
goto err;
|
|
}
|
|
}
|
|
|
|
rets = size;
|
|
err:
|
|
cl_dbg(dev, cl, "rpm: autosuspend\n");
|
|
pm_runtime_mark_last_busy(dev->dev);
|
|
pm_runtime_put_autosuspend(dev->dev);
|
|
free:
|
|
mei_io_cb_free(cb);
|
|
|
|
return rets;
|
|
}
|
|
|
|
|
|
/**
|
|
* mei_cl_complete - processes completed operation for a client
|
|
*
|
|
* @cl: private data of the file object.
|
|
* @cb: callback block.
|
|
*/
|
|
void mei_cl_complete(struct mei_cl *cl, struct mei_cl_cb *cb)
|
|
{
|
|
struct mei_device *dev = cl->dev;
|
|
|
|
switch (cb->fop_type) {
|
|
case MEI_FOP_WRITE:
|
|
mei_io_cb_free(cb);
|
|
cl->writing_state = MEI_WRITE_COMPLETE;
|
|
if (waitqueue_active(&cl->tx_wait)) {
|
|
wake_up_interruptible(&cl->tx_wait);
|
|
} else {
|
|
pm_runtime_mark_last_busy(dev->dev);
|
|
pm_request_autosuspend(dev->dev);
|
|
}
|
|
break;
|
|
|
|
case MEI_FOP_READ:
|
|
list_add_tail(&cb->list, &cl->rd_completed);
|
|
if (!mei_cl_is_fixed_address(cl) &&
|
|
!WARN_ON(!cl->rx_flow_ctrl_creds))
|
|
cl->rx_flow_ctrl_creds--;
|
|
if (!mei_cl_bus_rx_event(cl))
|
|
wake_up_interruptible(&cl->rx_wait);
|
|
break;
|
|
|
|
case MEI_FOP_CONNECT:
|
|
case MEI_FOP_DISCONNECT:
|
|
case MEI_FOP_NOTIFY_STOP:
|
|
case MEI_FOP_NOTIFY_START:
|
|
if (waitqueue_active(&cl->wait))
|
|
wake_up(&cl->wait);
|
|
|
|
break;
|
|
case MEI_FOP_DISCONNECT_RSP:
|
|
mei_io_cb_free(cb);
|
|
mei_cl_set_disconnected(cl);
|
|
break;
|
|
default:
|
|
BUG_ON(0);
|
|
}
|
|
}
|
|
|
|
|
|
/**
|
|
* mei_cl_all_disconnect - disconnect forcefully all connected clients
|
|
*
|
|
* @dev: mei device
|
|
*/
|
|
void mei_cl_all_disconnect(struct mei_device *dev)
|
|
{
|
|
struct mei_cl *cl;
|
|
|
|
list_for_each_entry(cl, &dev->file_list, link)
|
|
mei_cl_set_disconnected(cl);
|
|
}
|