// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (c) 2003-2020, Intel Corporation. All rights reserved.
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* Intel Management Engine Interface (Intel MEI) Linux driver
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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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mei_me_cl_put(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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mei_me_cl_put(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_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_tx_cb_queue - queue tx callback
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*
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* Locking: called under "dev->device_lock" lock
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*
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* @cb: mei callback struct
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* @head: an instance of list to queue on
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*/
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static inline void mei_tx_cb_enqueue(struct mei_cl_cb *cb,
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struct list_head *head)
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{
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list_add_tail(&cb->list, head);
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cb->cl->tx_cb_queued++;
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}
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/**
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* mei_tx_cb_dequeue - dequeue tx callback
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*
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* Locking: called under "dev->device_lock" lock
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*
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* @cb: mei callback struct to dequeue and free
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*/
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static inline void mei_tx_cb_dequeue(struct mei_cl_cb *cb)
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{
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if (!WARN_ON(cb->cl->tx_cb_queued == 0))
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cb->cl->tx_cb_queued--;
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mei_io_cb_free(cb);
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}
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/**
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* mei_cl_set_read_by_fp - set pending_read flag to vtag struct for given fp
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*
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* Locking: called under "dev->device_lock" lock
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*
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* @cl: mei client
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* @fp: pointer to file structure
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*/
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static void mei_cl_set_read_by_fp(const struct mei_cl *cl,
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const struct file *fp)
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{
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struct mei_cl_vtag *cl_vtag;
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list_for_each_entry(cl_vtag, &cl->vtag_map, list) {
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if (cl_vtag->fp == fp) {
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cl_vtag->pending_read = true;
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return;
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}
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}
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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(*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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cb->vtag = 0;
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return cb;
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}
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/**
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* mei_io_list_flush_cl - removes cbs belonging to the 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 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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struct mei_cl_cb *cb, *next;
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list_for_each_entry_safe(cb, next, head, list) {
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if (cl == cb->cl) {
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list_del_init(&cb->list);
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if (cb->fop_type == MEI_FOP_READ)
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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_tx_list_free_cl - removes cb belonging to the 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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* @fp: file pointer (matching cb file object), may be NULL
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*/
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static void mei_io_tx_list_free_cl(struct list_head *head,
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const struct mei_cl *cl,
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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 (cl == cb->cl && (!fp || fp == cb->fp))
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mei_tx_cb_dequeue(cb);
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}
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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_free_pending - free pending cb
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*
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* @cl: host client
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*/
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static void mei_cl_free_pending(struct mei_cl *cl)
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{
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struct mei_cl_cb *cb;
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cb = list_first_entry_or_null(&cl->rd_pending, struct mei_cl_cb, list);
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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(roundup(length, MEI_SLOT_SIZE), 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(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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struct mei_cl_cb *ret_cb = NULL;
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spin_lock(&cl->rd_completed_lock);
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list_for_each_entry(cb, &cl->rd_completed, list)
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if (!fp || fp == cb->fp) {
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ret_cb = cb;
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break;
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}
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spin_unlock(&cl->rd_completed_lock);
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return ret_cb;
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}
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/**
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* mei_cl_flush_queues - flushes queue lists belonging to cl.
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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: 0 on success, -EINVAL if cl or cl->dev is NULL.
|
*/
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int mei_cl_flush_queues(struct mei_cl *cl, const struct file *fp)
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{
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struct mei_device *dev;
|
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if (WARN_ON(!cl || !cl->dev))
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return -EINVAL;
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dev = cl->dev;
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cl_dbg(dev, cl, "remove list entry belonging to cl\n");
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mei_io_tx_list_free_cl(&cl->dev->write_list, cl, fp);
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mei_io_tx_list_free_cl(&cl->dev->write_waiting_list, cl, fp);
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/* free pending and control cb only in final flush */
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if (!fp) {
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mei_io_list_flush_cl(&cl->dev->ctrl_wr_list, cl);
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mei_io_list_flush_cl(&cl->dev->ctrl_rd_list, cl);
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mei_cl_free_pending(cl);
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}
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spin_lock(&cl->rd_completed_lock);
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mei_io_list_free_fp(&cl->rd_completed, fp);
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spin_unlock(&cl->rd_completed_lock);
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return 0;
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}
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|
/**
|
* mei_cl_init - initializes cl.
|
*
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* @cl: host client to be initialized
|
* @dev: mei device
|
*/
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static void mei_cl_init(struct mei_cl *cl, struct mei_device *dev)
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{
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memset(cl, 0, sizeof(*cl));
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init_waitqueue_head(&cl->wait);
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init_waitqueue_head(&cl->rx_wait);
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init_waitqueue_head(&cl->tx_wait);
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init_waitqueue_head(&cl->ev_wait);
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INIT_LIST_HEAD(&cl->vtag_map);
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spin_lock_init(&cl->rd_completed_lock);
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INIT_LIST_HEAD(&cl->rd_completed);
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INIT_LIST_HEAD(&cl->rd_pending);
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INIT_LIST_HEAD(&cl->link);
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cl->writing_state = MEI_IDLE;
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cl->state = MEI_FILE_UNINITIALIZED;
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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(*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)
|
{
|
mei_set_devstate(dev, 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_tx_list_free_cl(&dev->write_list, cl, NULL);
|
mei_io_tx_list_free_cl(&dev->write_waiting_list, cl, NULL);
|
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;
|
|
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_hbm2slots(sizeof(struct hbm_client_connect_request));
|
slots = mei_hbuf_empty_slots(dev);
|
if (slots < 0)
|
return -EOVERFLOW;
|
|
if ((u32)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;
|
}
|
|
if (dev->dev_state == MEI_DEV_POWER_DOWN) {
|
cl_dbg(dev, cl, "Device is powering down, don't bother with disconnection\n");
|
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;
|
|
if (mei_cl_is_other_connecting(cl))
|
return 0;
|
|
msg_slots = mei_hbm2slots(sizeof(struct hbm_client_connect_request));
|
slots = mei_hbuf_empty_slots(dev);
|
if (slots < 0)
|
return -EOVERFLOW;
|
|
if ((u32)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;
|
|
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_vtag_alloc - allocate and fill the vtag structure
|
*
|
* @fp: pointer to file structure
|
* @vtag: vm tag
|
*
|
* Return:
|
* * Pointer to allocated struct - on success
|
* * ERR_PTR(-ENOMEM) on memory allocation failure
|
*/
|
struct mei_cl_vtag *mei_cl_vtag_alloc(struct file *fp, u8 vtag)
|
{
|
struct mei_cl_vtag *cl_vtag;
|
|
cl_vtag = kzalloc(sizeof(*cl_vtag), GFP_KERNEL);
|
if (!cl_vtag)
|
return ERR_PTR(-ENOMEM);
|
|
INIT_LIST_HEAD(&cl_vtag->list);
|
cl_vtag->vtag = vtag;
|
cl_vtag->fp = fp;
|
|
return cl_vtag;
|
}
|
|
/**
|
* mei_cl_fp_by_vtag - obtain the file pointer by vtag
|
*
|
* @cl: host client
|
* @vtag: vm tag
|
*
|
* Return:
|
* * A file pointer - on success
|
* * ERR_PTR(-ENOENT) if vtag is not found in the client vtag list
|
*/
|
const struct file *mei_cl_fp_by_vtag(const struct mei_cl *cl, u8 vtag)
|
{
|
struct mei_cl_vtag *vtag_l;
|
|
list_for_each_entry(vtag_l, &cl->vtag_map, list)
|
if (vtag_l->vtag == vtag)
|
return vtag_l->fp;
|
|
return ERR_PTR(-ENOENT);
|
}
|
|
/**
|
* mei_cl_reset_read_by_vtag - reset pending_read flag by given vtag
|
*
|
* @cl: host client
|
* @vtag: vm tag
|
*/
|
static void mei_cl_reset_read_by_vtag(const struct mei_cl *cl, u8 vtag)
|
{
|
struct mei_cl_vtag *vtag_l;
|
|
list_for_each_entry(vtag_l, &cl->vtag_map, list) {
|
if (vtag_l->vtag == vtag) {
|
vtag_l->pending_read = false;
|
break;
|
}
|
}
|
}
|
|
/**
|
* mei_cl_read_vtag_add_fc - add flow control for next pending reader
|
* in the vtag list
|
*
|
* @cl: host client
|
*/
|
static void mei_cl_read_vtag_add_fc(struct mei_cl *cl)
|
{
|
struct mei_cl_vtag *cl_vtag;
|
|
list_for_each_entry(cl_vtag, &cl->vtag_map, list) {
|
if (cl_vtag->pending_read) {
|
if (mei_cl_enqueue_ctrl_wr_cb(cl,
|
mei_cl_mtu(cl),
|
MEI_FOP_READ,
|
cl_vtag->fp))
|
cl->rx_flow_ctrl_creds++;
|
break;
|
}
|
}
|
}
|
|
/**
|
* mei_cl_vt_support_check - check if client support vtags
|
*
|
* @cl: host client
|
*
|
* Return:
|
* * 0 - supported, or not connected at all
|
* * -EOPNOTSUPP - vtags are not supported by client
|
*/
|
int mei_cl_vt_support_check(const struct mei_cl *cl)
|
{
|
struct mei_device *dev = cl->dev;
|
|
if (!dev->hbm_f_vt_supported)
|
return -EOPNOTSUPP;
|
|
if (!cl->me_cl)
|
return 0;
|
|
return cl->me_cl->props.vt_supported ? 0 : -EOPNOTSUPP;
|
}
|
|
/**
|
* mei_cl_add_rd_completed - add read completed callback to list with lock
|
* and vtag check
|
*
|
* @cl: host client
|
* @cb: callback block
|
*
|
*/
|
void mei_cl_add_rd_completed(struct mei_cl *cl, struct mei_cl_cb *cb)
|
{
|
const struct file *fp;
|
|
if (!mei_cl_vt_support_check(cl)) {
|
fp = mei_cl_fp_by_vtag(cl, cb->vtag);
|
if (IS_ERR(fp)) {
|
/* client already disconnected, discarding */
|
mei_io_cb_free(cb);
|
return;
|
}
|
cb->fp = fp;
|
mei_cl_reset_read_by_vtag(cl, cb->vtag);
|
mei_cl_read_vtag_add_fc(cl);
|
}
|
|
spin_lock(&cl->rd_completed_lock);
|
list_add_tail(&cb->list, &cl->rd_completed);
|
spin_unlock(&cl->rd_completed_lock);
|
}
|
|
/**
|
* mei_cl_del_rd_completed - free read completed callback with lock
|
*
|
* @cl: host client
|
* @cb: callback block
|
*
|
*/
|
void mei_cl_del_rd_completed(struct mei_cl *cl, struct mei_cl_cb *cb)
|
{
|
spin_lock(&cl->rd_completed_lock);
|
mei_io_cb_free(cb);
|
spin_unlock(&cl->rd_completed_lock);
|
}
|
|
/**
|
* 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_hbm2slots(sizeof(struct hbm_client_connect_request));
|
slots = mei_hbuf_empty_slots(dev);
|
if (slots < 0)
|
return -EOVERFLOW;
|
|
if ((u32)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 ||
|
cl->status ||
|
!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) {
|
mei_cl_set_read_by_fp(cl, fp);
|
return -EBUSY;
|
}
|
|
cb = mei_cl_enqueue_ctrl_wr_cb(cl, length, MEI_FOP_READ, fp);
|
if (!cb)
|
return -ENOMEM;
|
|
mei_cl_set_read_by_fp(cl, fp);
|
|
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;
|
}
|
|
static inline u8 mei_ext_hdr_set_vtag(struct mei_ext_hdr *ext, u8 vtag)
|
{
|
ext->type = MEI_EXT_HDR_VTAG;
|
ext->ext_payload[0] = vtag;
|
ext->length = mei_data2slots(sizeof(*ext));
|
return ext->length;
|
}
|
|
/**
|
* mei_msg_hdr_init - allocate and initialize mei message header
|
*
|
* @cb: message callback structure
|
*
|
* Return: a pointer to initialized header
|
*/
|
static struct mei_msg_hdr *mei_msg_hdr_init(const struct mei_cl_cb *cb)
|
{
|
size_t hdr_len;
|
struct mei_ext_meta_hdr *meta;
|
struct mei_ext_hdr *ext;
|
struct mei_msg_hdr *mei_hdr;
|
bool is_ext, is_vtag;
|
|
if (!cb)
|
return ERR_PTR(-EINVAL);
|
|
/* Extended header for vtag is attached only on the first fragment */
|
is_vtag = (cb->vtag && cb->buf_idx == 0);
|
is_ext = is_vtag;
|
|
/* Compute extended header size */
|
hdr_len = sizeof(*mei_hdr);
|
|
if (!is_ext)
|
goto setup_hdr;
|
|
hdr_len += sizeof(*meta);
|
if (is_vtag)
|
hdr_len += sizeof(*ext);
|
|
setup_hdr:
|
mei_hdr = kzalloc(hdr_len, GFP_KERNEL);
|
if (!mei_hdr)
|
return ERR_PTR(-ENOMEM);
|
|
mei_hdr->host_addr = mei_cl_host_addr(cb->cl);
|
mei_hdr->me_addr = mei_cl_me_id(cb->cl);
|
mei_hdr->internal = cb->internal;
|
mei_hdr->extended = is_ext;
|
|
if (!is_ext)
|
goto out;
|
|
meta = (struct mei_ext_meta_hdr *)mei_hdr->extension;
|
if (is_vtag) {
|
meta->count++;
|
meta->size += mei_ext_hdr_set_vtag(meta->hdrs, cb->vtag);
|
}
|
out:
|
mei_hdr->length = hdr_len - sizeof(*mei_hdr);
|
return mei_hdr;
|
}
|
|
/**
|
* 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 = NULL;
|
size_t hdr_len;
|
size_t hbuf_len, dr_len;
|
size_t buf_len;
|
size_t data_len;
|
int hbuf_slots;
|
u32 dr_slots;
|
u32 dma_len;
|
int rets;
|
bool first_chunk;
|
const void *data;
|
|
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;
|
}
|
|
buf_len = buf->size - cb->buf_idx;
|
data = buf->data + cb->buf_idx;
|
hbuf_slots = mei_hbuf_empty_slots(dev);
|
if (hbuf_slots < 0) {
|
rets = -EOVERFLOW;
|
goto err;
|
}
|
|
hbuf_len = mei_slots2data(hbuf_slots) & MEI_MSG_MAX_LEN_MASK;
|
dr_slots = mei_dma_ring_empty_slots(dev);
|
dr_len = mei_slots2data(dr_slots);
|
|
mei_hdr = mei_msg_hdr_init(cb);
|
if (IS_ERR(mei_hdr)) {
|
rets = PTR_ERR(mei_hdr);
|
mei_hdr = NULL;
|
goto err;
|
}
|
|
cl_dbg(dev, cl, "Extended Header %d vtag = %d\n",
|
mei_hdr->extended, cb->vtag);
|
|
hdr_len = sizeof(*mei_hdr) + mei_hdr->length;
|
|
/**
|
* Split the message only if we can write the whole host buffer
|
* otherwise wait for next time the host buffer is empty.
|
*/
|
if (hdr_len + buf_len <= hbuf_len) {
|
data_len = buf_len;
|
mei_hdr->msg_complete = 1;
|
} else if (dr_slots && hbuf_len >= hdr_len + sizeof(dma_len)) {
|
mei_hdr->dma_ring = 1;
|
if (buf_len > dr_len)
|
buf_len = dr_len;
|
else
|
mei_hdr->msg_complete = 1;
|
|
data_len = sizeof(dma_len);
|
dma_len = buf_len;
|
data = &dma_len;
|
} else if ((u32)hbuf_slots == mei_hbuf_depth(dev)) {
|
buf_len = hbuf_len - hdr_len;
|
data_len = buf_len;
|
} else {
|
kfree(mei_hdr);
|
return 0;
|
}
|
mei_hdr->length += data_len;
|
|
if (mei_hdr->dma_ring)
|
mei_dma_ring_write(dev, buf->data + cb->buf_idx, buf_len);
|
rets = mei_write_message(dev, mei_hdr, hdr_len, data, data_len);
|
|
if (rets)
|
goto err;
|
|
cl->status = 0;
|
cl->writing_state = MEI_WRITING;
|
cb->buf_idx += buf_len;
|
|
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);
|
|
kfree(mei_hdr);
|
return 0;
|
|
err:
|
kfree(mei_hdr);
|
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.
|
*/
|
ssize_t 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 = NULL;
|
size_t hdr_len;
|
size_t hbuf_len, dr_len;
|
size_t buf_len;
|
size_t data_len;
|
int hbuf_slots;
|
u32 dr_slots;
|
u32 dma_len;
|
ssize_t rets;
|
bool blocking;
|
const void *data;
|
|
if (WARN_ON(!cl || !cl->dev))
|
return -ENODEV;
|
|
if (WARN_ON(!cb))
|
return -EINVAL;
|
|
dev = cl->dev;
|
|
buf = &cb->buf;
|
buf_len = buf->size;
|
|
cl_dbg(dev, cl, "buf_len=%zd\n", buf_len);
|
|
blocking = cb->blocking;
|
data = buf->data;
|
|
rets = pm_runtime_get(dev->dev);
|
if (rets < 0 && rets != -EINPROGRESS) {
|
pm_runtime_put_noidle(dev->dev);
|
cl_err(dev, cl, "rpm: get failed %zd\n", rets);
|
goto free;
|
}
|
|
cb->buf_idx = 0;
|
cl->writing_state = MEI_IDLE;
|
|
|
rets = mei_cl_tx_flow_ctrl_creds(cl);
|
if (rets < 0)
|
goto err;
|
|
mei_hdr = mei_msg_hdr_init(cb);
|
if (IS_ERR(mei_hdr)) {
|
rets = -PTR_ERR(mei_hdr);
|
mei_hdr = NULL;
|
goto err;
|
}
|
|
cl_dbg(dev, cl, "Extended Header %d vtag = %d\n",
|
mei_hdr->extended, cb->vtag);
|
|
hdr_len = sizeof(*mei_hdr) + mei_hdr->length;
|
|
if (rets == 0) {
|
cl_dbg(dev, cl, "No flow control credentials: not sending.\n");
|
rets = buf_len;
|
goto out;
|
}
|
|
if (!mei_hbuf_acquire(dev)) {
|
cl_dbg(dev, cl, "Cannot acquire the host buffer: not sending.\n");
|
rets = buf_len;
|
goto out;
|
}
|
|
hbuf_slots = mei_hbuf_empty_slots(dev);
|
if (hbuf_slots < 0) {
|
rets = -EOVERFLOW;
|
goto out;
|
}
|
|
hbuf_len = mei_slots2data(hbuf_slots) & MEI_MSG_MAX_LEN_MASK;
|
dr_slots = mei_dma_ring_empty_slots(dev);
|
dr_len = mei_slots2data(dr_slots);
|
|
if (hdr_len + buf_len <= hbuf_len) {
|
data_len = buf_len;
|
mei_hdr->msg_complete = 1;
|
} else if (dr_slots && hbuf_len >= hdr_len + sizeof(dma_len)) {
|
mei_hdr->dma_ring = 1;
|
if (buf_len > dr_len)
|
buf_len = dr_len;
|
else
|
mei_hdr->msg_complete = 1;
|
|
data_len = sizeof(dma_len);
|
dma_len = buf_len;
|
data = &dma_len;
|
} else {
|
buf_len = hbuf_len - hdr_len;
|
data_len = buf_len;
|
}
|
|
mei_hdr->length += data_len;
|
|
if (mei_hdr->dma_ring)
|
mei_dma_ring_write(dev, buf->data, buf_len);
|
rets = mei_write_message(dev, mei_hdr, hdr_len, data, data_len);
|
|
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 = buf_len;
|
/* restore return value */
|
buf_len = buf->size;
|
|
out:
|
if (mei_hdr->msg_complete)
|
mei_tx_cb_enqueue(cb, &dev->write_waiting_list);
|
else
|
mei_tx_cb_enqueue(cb, &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 = buf_len;
|
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);
|
|
kfree(mei_hdr);
|
|
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_tx_cb_dequeue(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:
|
mei_cl_add_rd_completed(cl, cb);
|
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);
|
}
|
