path: root/drivers/misc/mei/interrupt.c

/*
 *
 * Intel Management Engine Interface (Intel MEI) Linux driver
 * Copyright (c) 2003-2012, Intel Corporation.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 */


#include <linux/pci.h>
#include <linux/kthread.h>
#include <linux/interrupt.h>
#include <linux/fs.h>
#include <linux/jiffies.h>

#include "mei_dev.h"
#include <linux/mei.h>
#include "hw.h"
#include "interface.h"


/**
 * mei_interrupt_quick_handler - The ISR of the MEI device
 *
 * @irq: The irq number
 * @dev_id: pointer to the device structure
 *
 * returns irqreturn_t
 */
irqreturn_t mei_interrupt_quick_handler(int irq, void *dev_id)
{
	struct mei_device *dev = (struct mei_device *) dev_id;
	u32 csr_reg = mei_hcsr_read(dev);

	if ((csr_reg & H_IS) != H_IS)
		return IRQ_NONE;

	/* clear H_IS bit in H_CSR */
	mei_reg_write(dev, H_CSR, csr_reg);

	return IRQ_WAKE_THREAD;
}

/**
 * _mei_cmpl - processes completed operation.
 *
 * @cl: private data of the file object.
 * @cb_pos: callback block.
 */
static void _mei_cmpl(struct mei_cl *cl, struct mei_cl_cb *cb_pos)
{
	if (cb_pos->fop_type == MEI_FOP_WRITE) {
		mei_io_cb_free(cb_pos);
		cb_pos = NULL;
		cl->writing_state = MEI_WRITE_COMPLETE;
		if (waitqueue_active(&cl->tx_wait))
			wake_up_interruptible(&cl->tx_wait);

	} else if (cb_pos->fop_type == MEI_FOP_READ &&
			MEI_READING == cl->reading_state) {
		cl->reading_state = MEI_READ_COMPLETE;
		if (waitqueue_active(&cl->rx_wait))
			wake_up_interruptible(&cl->rx_wait);

	}
}

/**
 * _mei_irq_thread_state_ok - checks if mei header matches file private data
 *
 * @cl: private data of the file object
 * @mei_hdr: header of mei client message
 *
 * returns !=0 if matches, 0 if no match.
 */
static int _mei_irq_thread_state_ok(struct mei_cl *cl,
				struct mei_msg_hdr *mei_hdr)
{
	return (cl->host_client_id == mei_hdr->host_addr &&
		cl->me_client_id == mei_hdr->me_addr &&
		cl->state == MEI_FILE_CONNECTED &&
		MEI_READ_COMPLETE != cl->reading_state);
}

/**
 * mei_irq_thread_read_client_message - bottom half read routine after ISR to
 * handle the read mei client message data processing.
 *
 * @complete_list: An instance of our list structure
 * @dev: the device structure
 * @mei_hdr: header of mei client message
 *
 * returns 0 on success, <0 on failure.
 */
static int mei_irq_thread_read_client_message(struct mei_cl_cb *complete_list,
		struct mei_device *dev,
		struct mei_msg_hdr *mei_hdr)
{
	struct mei_cl *cl;
	struct mei_cl_cb *cb_pos = NULL, *cb_next = NULL;
	unsigned char *buffer = NULL;

	dev_dbg(&dev->pdev->dev, "start client msg\n");
	if (list_empty(&dev->read_list.list))
		goto quit;

	list_for_each_entry_safe(cb_pos, cb_next, &dev->read_list.list, list) {
		cl = cb_pos->cl;
		if (cl && <