526 lines
12 KiB
C
526 lines
12 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/export.h>
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#include <linux/kthread.h>
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#include <linux/interrupt.h>
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#include <linux/fs.h>
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#include <linux/jiffies.h>
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#include <linux/slab.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_irq_compl_handler - dispatch complete handlers
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* for the completed callbacks
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*
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* @dev: mei device
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* @compl_list: list of completed cbs
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*/
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void mei_irq_compl_handler(struct mei_device *dev, struct mei_cl_cb *compl_list)
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{
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struct mei_cl_cb *cb, *next;
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struct mei_cl *cl;
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list_for_each_entry_safe(cb, next, &compl_list->list, list) {
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cl = cb->cl;
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list_del_init(&cb->list);
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dev_dbg(dev->dev, "completing call back.\n");
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if (cl == &dev->iamthif_cl)
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mei_amthif_complete(dev, cb);
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else
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mei_cl_complete(cl, cb);
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}
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}
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EXPORT_SYMBOL_GPL(mei_irq_compl_handler);
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/**
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* mei_cl_hbm_equal - check if hbm is addressed to the client
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*
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* @cl: host client
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* @mei_hdr: header of mei client message
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*
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* Return: true if matches, false otherwise
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*/
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static inline int mei_cl_hbm_equal(struct mei_cl *cl,
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struct mei_msg_hdr *mei_hdr)
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{
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return mei_cl_host_addr(cl) == mei_hdr->host_addr &&
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mei_cl_me_id(cl) == mei_hdr->me_addr;
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}
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/**
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* mei_irq_discard_msg - discard received message
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*
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* @dev: mei device
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* @hdr: message header
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*/
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static inline
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void mei_irq_discard_msg(struct mei_device *dev, struct mei_msg_hdr *hdr)
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{
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/*
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* no need to check for size as it is guarantied
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* that length fits into rd_msg_buf
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*/
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mei_read_slots(dev, dev->rd_msg_buf, hdr->length);
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dev_dbg(dev->dev, "discarding message " MEI_HDR_FMT "\n",
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MEI_HDR_PRM(hdr));
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}
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/**
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* mei_cl_irq_read_msg - process client message
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*
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* @cl: reading client
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* @mei_hdr: header of mei client message
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* @complete_list: completion list
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*
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* Return: always 0
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*/
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int mei_cl_irq_read_msg(struct mei_cl *cl,
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struct mei_msg_hdr *mei_hdr,
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struct mei_cl_cb *complete_list)
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{
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struct mei_device *dev = cl->dev;
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struct mei_cl_cb *cb;
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unsigned char *buffer = NULL;
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cb = list_first_entry_or_null(&cl->rd_pending, struct mei_cl_cb, list);
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if (!cb) {
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cl_err(dev, cl, "pending read cb not found\n");
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goto out;
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}
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if (!mei_cl_is_connected(cl)) {
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cl_dbg(dev, cl, "not connected\n");
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cb->status = -ENODEV;
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goto out;
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}
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if (cb->buf.size == 0 || cb->buf.data == NULL) {
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cl_err(dev, cl, "response buffer is not allocated.\n");
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list_move_tail(&cb->list, &complete_list->list);
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cb->status = -ENOMEM;
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goto out;
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}
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if (cb->buf.size < mei_hdr->length + cb->buf_idx) {
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cl_dbg(dev, cl, "message overflow. size %d len %d idx %ld\n",
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cb->buf.size, mei_hdr->length, cb->buf_idx);
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buffer = krealloc(cb->buf.data, mei_hdr->length + cb->buf_idx,
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GFP_KERNEL);
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if (!buffer) {
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cb->status = -ENOMEM;
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list_move_tail(&cb->list, &complete_list->list);
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goto out;
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}
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cb->buf.data = buffer;
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cb->buf.size = mei_hdr->length + cb->buf_idx;
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}
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buffer = cb->buf.data + cb->buf_idx;
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mei_read_slots(dev, buffer, mei_hdr->length);
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cb->buf_idx += mei_hdr->length;
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if (mei_hdr->msg_complete) {
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cb->read_time = jiffies;
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cl_dbg(dev, cl, "completed read length = %lu\n", cb->buf_idx);
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list_move_tail(&cb->list, &complete_list->list);
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}
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out:
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if (!buffer)
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mei_irq_discard_msg(dev, mei_hdr);
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return 0;
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}
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/**
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* mei_cl_irq_disconnect_rsp - send disconnection response message
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*
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* @cl: client
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* @cb: callback block.
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* @cmpl_list: complete list.
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*
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* Return: 0, OK; otherwise, error.
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*/
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static int mei_cl_irq_disconnect_rsp(struct mei_cl *cl, struct mei_cl_cb *cb,
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struct mei_cl_cb *cmpl_list)
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{
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struct mei_device *dev = cl->dev;
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u32 msg_slots;
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int slots;
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int ret;
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slots = mei_hbuf_empty_slots(dev);
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msg_slots = mei_data2slots(sizeof(struct hbm_client_connect_response));
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if (slots < msg_slots)
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return -EMSGSIZE;
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ret = mei_hbm_cl_disconnect_rsp(dev, cl);
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mei_cl_set_disconnected(cl);
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mei_io_cb_free(cb);
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mei_me_cl_put(cl->me_cl);
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cl->me_cl = NULL;
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return ret;
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}
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/**
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* mei_cl_irq_read - processes client read related operation from the
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* interrupt thread context - request for flow control credits
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*
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* @cl: client
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* @cb: callback block.
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* @cmpl_list: complete list.
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*
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* Return: 0, OK; otherwise, error.
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*/
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static int mei_cl_irq_read(struct mei_cl *cl, struct mei_cl_cb *cb,
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struct mei_cl_cb *cmpl_list)
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{
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struct mei_device *dev = cl->dev;
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u32 msg_slots;
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int slots;
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int ret;
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msg_slots = mei_data2slots(sizeof(struct hbm_flow_control));
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slots = mei_hbuf_empty_slots(dev);
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if (slots < msg_slots)
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return -EMSGSIZE;
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ret = mei_hbm_cl_flow_control_req(dev, cl);
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if (ret) {
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cl->status = ret;
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cb->buf_idx = 0;
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list_move_tail(&cb->list, &cmpl_list->list);
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return ret;
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}
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list_move_tail(&cb->list, &cl->rd_pending);
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return 0;
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}
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/**
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* mei_irq_read_handler - bottom half read routine after ISR to
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* handle the read processing.
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*
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* @dev: the device structure
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* @cmpl_list: An instance of our list structure
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* @slots: slots to read.
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*
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* Return: 0 on success, <0 on failure.
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*/
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int mei_irq_read_handler(struct mei_device *dev,
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struct mei_cl_cb *cmpl_list, s32 *slots)
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{
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struct mei_msg_hdr *mei_hdr;
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struct mei_cl *cl;
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int ret;
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if (!dev->rd_msg_hdr) {
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dev->rd_msg_hdr = mei_read_hdr(dev);
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(*slots)--;
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dev_dbg(dev->dev, "slots =%08x.\n", *slots);
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}
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mei_hdr = (struct mei_msg_hdr *) &dev->rd_msg_hdr;
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dev_dbg(dev->dev, MEI_HDR_FMT, MEI_HDR_PRM(mei_hdr));
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if (mei_hdr->reserved || !dev->rd_msg_hdr) {
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dev_err(dev->dev, "corrupted message header 0x%08X\n",
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dev->rd_msg_hdr);
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ret = -EBADMSG;
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goto end;
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}
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if (mei_slots2data(*slots) < mei_hdr->length) {
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dev_err(dev->dev, "less data available than length=%08x.\n",
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*slots);
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/* we can't read the message */
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ret = -ENODATA;
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goto end;
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}
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/* HBM message */
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if (mei_hdr->host_addr == 0 && mei_hdr->me_addr == 0) {
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ret = mei_hbm_dispatch(dev, mei_hdr);
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if (ret) {
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dev_dbg(dev->dev, "mei_hbm_dispatch failed ret = %d\n",
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ret);
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goto end;
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}
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goto reset_slots;
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}
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/* find recipient cl */
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list_for_each_entry(cl, &dev->file_list, link) {
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if (mei_cl_hbm_equal(cl, mei_hdr)) {
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cl_dbg(dev, cl, "got a message\n");
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break;
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}
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}
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/* if no recipient cl was found we assume corrupted header */
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if (&cl->link == &dev->file_list) {
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dev_err(dev->dev, "no destination client found 0x%08X\n",
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dev->rd_msg_hdr);
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ret = -EBADMSG;
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goto end;
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}
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if (cl == &dev->iamthif_cl) {
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ret = mei_amthif_irq_read_msg(cl, mei_hdr, cmpl_list);
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} else {
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ret = mei_cl_irq_read_msg(cl, mei_hdr, cmpl_list);
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}
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reset_slots:
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/* reset the number of slots and header */
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*slots = mei_count_full_read_slots(dev);
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dev->rd_msg_hdr = 0;
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if (*slots == -EOVERFLOW) {
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/* overflow - reset */
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dev_err(dev->dev, "resetting due to slots overflow.\n");
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/* set the event since message has been read */
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ret = -ERANGE;
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goto end;
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}
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end:
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return ret;
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}
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EXPORT_SYMBOL_GPL(mei_irq_read_handler);
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/**
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* mei_irq_write_handler - dispatch write requests
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* after irq received
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*
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* @dev: the device structure
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* @cmpl_list: An instance of our list structure
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*
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* Return: 0 on success, <0 on failure.
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*/
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int mei_irq_write_handler(struct mei_device *dev, struct mei_cl_cb *cmpl_list)
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{
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struct mei_cl *cl;
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struct mei_cl_cb *cb, *next;
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struct mei_cl_cb *list;
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s32 slots;
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int ret;
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if (!mei_hbuf_acquire(dev))
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return 0;
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slots = mei_hbuf_empty_slots(dev);
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if (slots <= 0)
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return -EMSGSIZE;
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/* complete all waiting for write CB */
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dev_dbg(dev->dev, "complete all waiting for write cb.\n");
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list = &dev->write_waiting_list;
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list_for_each_entry_safe(cb, next, &list->list, list) {
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cl = cb->cl;
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cl->status = 0;
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cl_dbg(dev, cl, "MEI WRITE COMPLETE\n");
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cl->writing_state = MEI_WRITE_COMPLETE;
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list_move_tail(&cb->list, &cmpl_list->list);
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}
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if (dev->wd_state == MEI_WD_STOPPING) {
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dev->wd_state = MEI_WD_IDLE;
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wake_up(&dev->wait_stop_wd);
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}
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if (mei_cl_is_connected(&dev->wd_cl)) {
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if (dev->wd_pending &&
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mei_cl_flow_ctrl_creds(&dev->wd_cl) > 0) {
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ret = mei_wd_send(dev);
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if (ret)
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return ret;
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dev->wd_pending = false;
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}
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}
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/* complete control write list CB */
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dev_dbg(dev->dev, "complete control write list cb.\n");
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list_for_each_entry_safe(cb, next, &dev->ctrl_wr_list.list, list) {
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cl = cb->cl;
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switch (cb->fop_type) {
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case MEI_FOP_DISCONNECT:
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/* send disconnect message */
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ret = mei_cl_irq_disconnect(cl, cb, cmpl_list);
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if (ret)
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return ret;
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break;
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case MEI_FOP_READ:
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/* send flow control message */
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ret = mei_cl_irq_read(cl, cb, cmpl_list);
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if (ret)
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return ret;
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break;
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case MEI_FOP_CONNECT:
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/* connect message */
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ret = mei_cl_irq_connect(cl, cb, cmpl_list);
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if (ret)
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return ret;
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break;
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case MEI_FOP_DISCONNECT_RSP:
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/* send disconnect resp */
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ret = mei_cl_irq_disconnect_rsp(cl, cb, cmpl_list);
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if (ret)
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return ret;
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break;
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default:
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BUG();
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}
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}
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/* complete write list CB */
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dev_dbg(dev->dev, "complete write list cb.\n");
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list_for_each_entry_safe(cb, next, &dev->write_list.list, list) {
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cl = cb->cl;
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if (cl == &dev->iamthif_cl)
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ret = mei_amthif_irq_write(cl, cb, cmpl_list);
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else
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ret = mei_cl_irq_write(cl, cb, cmpl_list);
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if (ret)
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return ret;
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}
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return 0;
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}
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EXPORT_SYMBOL_GPL(mei_irq_write_handler);
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/**
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* mei_timer - timer function.
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*
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* @work: pointer to the work_struct structure
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*
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*/
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void mei_timer(struct work_struct *work)
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{
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unsigned long timeout;
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struct mei_cl *cl;
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struct mei_device *dev = container_of(work,
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struct mei_device, timer_work.work);
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mutex_lock(&dev->device_lock);
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/* Catch interrupt stalls during HBM init handshake */
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if (dev->dev_state == MEI_DEV_INIT_CLIENTS &&
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dev->hbm_state != MEI_HBM_IDLE) {
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if (dev->init_clients_timer) {
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if (--dev->init_clients_timer == 0) {
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dev_err(dev->dev, "timer: init clients timeout hbm_state = %d.\n",
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dev->hbm_state);
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mei_reset(dev);
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goto out;
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}
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}
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}
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if (dev->dev_state != MEI_DEV_ENABLED)
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goto out;
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/*** connect/disconnect timeouts ***/
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list_for_each_entry(cl, &dev->file_list, link) {
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if (cl->timer_count) {
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if (--cl->timer_count == 0) {
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dev_err(dev->dev, "timer: connect/disconnect timeout.\n");
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mei_reset(dev);
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goto out;
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}
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}
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}
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if (!mei_cl_is_connected(&dev->iamthif_cl))
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goto out;
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if (dev->iamthif_stall_timer) {
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if (--dev->iamthif_stall_timer == 0) {
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dev_err(dev->dev, "timer: amthif hanged.\n");
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mei_reset(dev);
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dev->iamthif_canceled = false;
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dev->iamthif_state = MEI_IAMTHIF_IDLE;
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dev->iamthif_timer = 0;
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mei_io_cb_free(dev->iamthif_current_cb);
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dev->iamthif_current_cb = NULL;
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dev->iamthif_file_object = NULL;
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mei_amthif_run_next_cmd(dev);
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}
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}
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if (dev->iamthif_timer) {
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timeout = dev->iamthif_timer +
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mei_secs_to_jiffies(MEI_IAMTHIF_READ_TIMER);
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dev_dbg(dev->dev, "dev->iamthif_timer = %ld\n",
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dev->iamthif_timer);
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dev_dbg(dev->dev, "timeout = %ld\n", timeout);
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dev_dbg(dev->dev, "jiffies = %ld\n", jiffies);
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if (time_after(jiffies, timeout)) {
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/*
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* User didn't read the AMTHI data on time (15sec)
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* freeing AMTHI for other requests
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*/
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dev_dbg(dev->dev, "freeing AMTHI for other requests\n");
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mei_io_list_flush(&dev->amthif_rd_complete_list,
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&dev->iamthif_cl);
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mei_io_cb_free(dev->iamthif_current_cb);
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dev->iamthif_current_cb = NULL;
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dev->iamthif_file_object->private_data = NULL;
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dev->iamthif_file_object = NULL;
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dev->iamthif_timer = 0;
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mei_amthif_run_next_cmd(dev);
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}
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}
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out:
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if (dev->dev_state != MEI_DEV_DISABLED)
|
|
schedule_delayed_work(&dev->timer_work, 2 * HZ);
|
|
mutex_unlock(&dev->device_lock);
|
|
}
|