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android-kvm / linux / cc20c031bb067eb3280a1c4b5c42295093e24863 / . / drivers / staging / heci / interrupt.c
blob: aacd262439883eaf5e8ce1b9190b07b1cd940fd8 [file] [log] [blame]
/*
* Part of Intel(R) Manageability Engine Interface Linux driver
*
* Copyright (c) 2003 - 2008 Intel Corp.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions, and the following disclaimer,
* without modification.
* 2. Redistributions in binary form must reproduce at minimum a disclaimer
* substantially similar to the "NO WARRANTY" disclaimer below
* ("Disclaimer") and any redistribution must be conditioned upon
* including a substantially similar Disclaimer requirement for further
* binary redistribution.
* 3. Neither the names of the above-listed copyright holders nor the names
* of any contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* Alternatively, this software may be distributed under the terms of the
* GNU General Public License ("GPL") version 2 as published by the Free
* Software Foundation.
*
* NO WARRANTY
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGES.
*
*/
#include <linux/kthread.h>
#include "heci.h"
#include "heci_interface.h"
/*
* interrupt function prototypes
*/
static void heci_bh_handler(struct work_struct *work);
static int heci_bh_read_handler(struct io_heci_list *complete_list,
struct iamt_heci_device *dev,
__s32 *slots);
static int heci_bh_write_handler(struct io_heci_list *complete_list,
struct iamt_heci_device *dev,
__s32 *slots);
static void heci_bh_read_bus_message(struct iamt_heci_device *dev,
struct heci_msg_hdr *heci_hdr);
static int heci_bh_read_pthi_message(struct io_heci_list *complete_list,
struct iamt_heci_device *dev,
struct heci_msg_hdr *heci_hdr);
static int heci_bh_read_client_message(struct io_heci_list *complete_list,
struct iamt_heci_device *dev,
struct heci_msg_hdr *heci_hdr);
static void heci_client_connect_response(struct iamt_heci_device *dev,
struct hbm_client_connect_response *connect_res);
static void heci_client_disconnect_response(struct iamt_heci_device *dev,
struct hbm_client_connect_response *disconnect_res);
static void heci_client_flow_control_response(struct iamt_heci_device *dev,
struct hbm_flow_control *flow_control);
static void heci_client_disconnect_request(struct iamt_heci_device *dev,
struct hbm_client_disconnect_request *disconnect_req);
/**
* heci_isr_interrupt - The ISR of the HECI device
*
* @irq: The irq number
* @dev_id: pointer to the device structure
*
* returns irqreturn_t
*/
irqreturn_t heci_isr_interrupt(int irq, void *dev_id)
{
int err;
struct iamt_heci_device *dev = (struct iamt_heci_device *) dev_id;
dev->host_hw_state = read_heci_register(dev, H_CSR);
if ((dev->host_hw_state & H_IS) != H_IS)
return IRQ_NONE;
/* disable interrupts */
heci_csr_disable_interrupts(dev);
/*
* Our device interrupted, schedule work the heci_bh_handler
* to handle the interrupt processing. This needs to be a
* workqueue item since the handler can sleep.
*/
PREPARE_WORK(&dev->work, heci_bh_handler);
DBG("schedule work the heci_bh_handler.\n");
err = schedule_work(&dev->work);
if (!err) {
printk(KERN_ERR "heci: schedule the heci_bh_handler"
" failed error=%x\n", err);
}
return IRQ_HANDLED;
}
/**
* _heci_cmpl - process completed operation.
*
* @file_ext: private data of the file object.
* @priv_cb_pos: callback block.
*/
static void _heci_cmpl(struct heci_file_private *file_ext,
struct heci_cb_private *priv_cb_pos)
{
if (priv_cb_pos->major_file_operations == HECI_WRITE) {
heci_free_cb_private(priv_cb_pos);
DBG("completing write call back.\n");
file_ext->writing_state = HECI_WRITE_COMPLETE;
if ((&file_ext->tx_wait) &&
waitqueue_active(&file_ext->tx_wait))
wake_up_interruptible(&file_ext->tx_wait);
} else if (priv_cb_pos->major_file_operations == HECI_READ
&& HECI_READING == file_ext->reading_state) {
DBG("completing read call back information= %lu\n",
priv_cb_pos->information);
file_ext->reading_state = HECI_READ_COMPLETE;
if ((&file_ext->rx_wait) &&
waitqueue_active(&file_ext->rx_wait))
wake_up_interruptible(&file_ext->rx_wait);
}
}
/**
* _heci_cmpl_iamthif - process completed iamthif operation.
*
* @dev: Device object for our driver.
* @priv_cb_pos: callback block.
*/
static void _heci_cmpl_iamthif(struct iamt_heci_device *dev,
struct heci_cb_private *priv_cb_pos)
{
if (dev->iamthif_canceled != 1) {
dev->iamthif_state = HECI_IAMTHIF_READ_COMPLETE;
dev->iamthif_stall_timer = 0;
memcpy(priv_cb_pos->response_buffer.data,
dev->iamthif_msg_buf,
dev->iamthif_msg_buf_index);
list_add_tail(&priv_cb_pos->cb_list,
&dev->pthi_read_complete_list.heci_cb.cb_list);
DBG("pthi read completed.\n");
} else {
run_next_iamthif_cmd(dev);
}
if (&dev->iamthif_file_ext.wait) {
DBG("completing pthi call back.\n");
wake_up_interruptible(&dev->iamthif_file_ext.wait);
}
}
/**
* heci_bh_handler - function called after ISR to handle the interrupt
* processing.
*
* @work: pointer to the work structure
*
* NOTE: This function is called by schedule work
*/
static void heci_bh_handler(struct work_struct *work)
{
struct iamt_heci_device *dev =
container_of(work, struct iamt_heci_device, work);
struct io_heci_list complete_list;
__s32 slots;
int rets;
struct heci_cb_private *cb_pos = NULL, *cb_next = NULL;
struct heci_file_private *file_ext;
int bus_message_received = 0;
struct task_struct *tsk;
DBG("function called after ISR to handle the interrupt processing.\n");
/* initialize our complete list */
spin_lock_bh(&dev->device_lock);
heci_initialize_list(&complete_list, dev);
dev->host_hw_state = read_heci_register(dev, H_CSR);
dev->me_hw_state = read_heci_register(dev, ME_CSR_HA);
/* check if ME wants a reset */
if (((dev->me_hw_state & ME_RDY_HRA) == 0)
&& (dev->heci_state != HECI_RESETING)
&& (dev->heci_state != HECI_INITIALIZING)) {
DBG("FW not ready.\n");
heci_reset(dev, 1);
spin_unlock_bh(&dev->device_lock);
return;
}
/* check if we need to start the dev */
if ((dev->host_hw_state & H_RDY) == 0) {
if ((dev->me_hw_state & ME_RDY_HRA) == ME_RDY_HRA) {
DBG("we need to start the dev.\n");
dev->host_hw_state |= (H_IE | H_IG | H_RDY);
heci_set_csr_register(dev);
if (dev->heci_state == HECI_INITIALIZING) {
dev->recvd_msg = 1;
spin_unlock_bh(&dev->device_lock);
wake_up_interruptible(&dev->wait_recvd_msg);
return;
} else {
spin_unlock_bh(&dev->device_lock);
tsk = kthread_run(heci_task_initialize_clients,
dev, "heci_reinit");
if (IS_ERR(tsk)) {
int rc = PTR_ERR(tsk);
printk(KERN_WARNING "heci: Unable to"
"start the heci thread: %d\n", rc);
}
return;
}
} else {
DBG("enable interrupt FW not ready.\n");
heci_csr_enable_interrupts(dev);
spin_unlock_bh(&dev->device_lock);
return;
}
}
/* check slots avalable for reading */
slots = count_full_read_slots(dev);
DBG("slots =%08x extra_write_index =%08x.\n",
slots, dev->extra_write_index);
while ((slots > 0) && (!dev->extra_write_index)) {
DBG("slots =%08x extra_write_index =%08x.\n", slots,
dev->extra_write_index);
DBG("call heci_bh_read_handler.\n");
rets = heci_bh_read_handler(&complete_list, dev, &slots);
if (rets != 0)
goto end;
}
rets = heci_bh_write_handler(&complete_list, dev, &slots);
end:
DBG("end of bottom half function.\n");
dev->host_hw_state = read_heci_register(dev, H_CSR);
dev->host_buffer_is_empty = host_buffer_is_empty(dev);
if ((dev->host_hw_state & H_IS) == H_IS) {
/* acknowledge interrupt and disable interrupts */
heci_csr_disable_interrupts(dev);
PREPARE_WORK(&dev->work, heci_bh_handler);
DBG("schedule work the heci_bh_handler.\n");
rets = schedule_work(&dev->work);
if (!rets) {
printk(KERN_ERR "heci: schedule the heci_bh_handler"
" failed error=%x\n", rets);
}
} else {
heci_csr_enable_interrupts(dev);
}
if (dev->recvd_msg && waitqueue_active(&dev->wait_recvd_msg)) {
DBG("received waiting bus message\n");
bus_message_received = 1;
}
spin_unlock_bh(&dev->device_lock);
if (bus_message_received) {
DBG("wake up dev->wait_recvd_msg\n");
wake_up_interruptible(&dev->wait_recvd_msg);
bus_message_received = 0;
}
if ((complete_list.status != 0)
|| list_empty(&complete_list.heci_cb.cb_list))
return;
list_for_each_entry_safe(cb_pos, cb_next,
&complete_list.heci_cb.cb_list, cb_list) {
file_ext = (struct heci_file_private *)cb_pos->file_private;
list_del(&cb_pos->cb_list);
if (file_ext != NULL) {
if (file_ext != &dev->iamthif_file_ext) {
DBG("completing call back.\n");
_heci_cmpl(file_ext, cb_pos);
cb_pos = NULL;
} else if (file_ext == &dev->iamthif_file_ext) {
_heci_cmpl_iamthif(dev, cb_pos);
}
}
}
}
/**
* heci_bh_read_handler - bottom half read routine after ISR to
* handle the read processing.
*
* @cmpl_list: An instance of our list structure
* @dev: Device object for our driver
* @slots: slots to read.
*
* returns 0 on success, <0 on failure.
*/
static int heci_bh_read_handler(struct io_heci_list *cmpl_list,
struct iamt_heci_device *dev,
__s32 *slots)
{
struct heci_msg_hdr *heci_hdr;
int ret = 0;
struct heci_file_private *file_pos = NULL;
struct heci_file_private *file_next = NULL;
if (!dev->rd_msg_hdr) {
dev->rd_msg_hdr = read_heci_register(dev, ME_CB_RW);
DBG("slots=%08x.\n", *slots);
(*slots)--;
DBG("slots=%08x.\n", *slots);
}
heci_hdr = (struct heci_msg_hdr *) &dev->rd_msg_hdr;
DBG("heci_hdr->length =%d\n", heci_hdr->length);
if ((heci_hdr->reserved) || !(dev->rd_msg_hdr)) {
DBG("corrupted message header.\n");
ret = -ECORRUPTED_MESSAGE_HEADER;
goto end;
}
if ((heci_hdr->host_addr) || (heci_hdr->me_addr)) {
list_for_each_entry_safe(file_pos, file_next,
&dev->file_list, link) {
DBG("list_for_each_entry_safe read host"
" client = %d, ME client = %d\n",
file_pos->host_client_id,
file_pos->me_client_id);
if ((file_pos->host_client_id == heci_hdr->host_addr)
&& (file_pos->me_client_id == heci_hdr->me_addr))
break;
}
if (&file_pos->link == &dev->file_list) {
DBG("corrupted message header\n");
ret = -ECORRUPTED_MESSAGE_HEADER;
goto end;
}
}
if (((*slots) * sizeof(__u32)) < heci_hdr->length) {
DBG("we can't read the message slots=%08x.\n", *slots);
/* we can't read the message */
ret = -ERANGE;
goto end;
}
/* decide where to read the message too */
if (!heci_hdr->host_addr) {
DBG("call heci_bh_read_bus_message.\n");
heci_bh_read_bus_message(dev, heci_hdr);
DBG("end heci_bh_read_bus_message.\n");
} else if ((heci_hdr->host_addr == dev->iamthif_file_ext.host_client_id)
&& (HECI_FILE_CONNECTED == dev->iamthif_file_ext.state)
&& (dev->iamthif_state == HECI_IAMTHIF_READING)) {
DBG("call heci_bh_read_iamthif_message.\n");
DBG("heci_hdr->length =%d\n", heci_hdr->length);
ret = heci_bh_read_pthi_message(cmpl_list, dev, heci_hdr);
if (ret != 0)
goto end;
} else {
DBG("call heci_bh_read_client_message.\n");
ret = heci_bh_read_client_message(cmpl_list, dev, heci_hdr);
if (ret != 0)
goto end;
}
/* reset the number of slots and header */
*slots = count_full_read_slots(dev);
dev->rd_msg_hdr = 0;
if (*slots == -ESLOTS_OVERFLOW) {
/* overflow - reset */
DBG("reseting due to slots overflow.\n");
/* set the event since message has been read */
ret = -ERANGE;
goto end;
}
end:
return ret;
}
/**
* heci_bh_read_bus_message - bottom half read routine after ISR to
* handle the read bus message cmd processing.
*
* @dev: Device object for our driver
* @heci_hdr: header of bus message
*/
static void heci_bh_read_bus_message(struct iamt_heci_device *dev,
struct heci_msg_hdr *heci_hdr)
{
struct heci_bus_message *heci_msg;
struct hbm_host_version_response *version_res;
struct hbm_client_connect_response *connect_res;
struct hbm_client_connect_response *disconnect_res;
struct hbm_flow_control *flow_control;
struct hbm_props_response *props_res;
struct hbm_host_enum_response *enum_res;
struct hbm_client_disconnect_request *disconnect_req;
struct hbm_host_stop_request *h_stop_req;
int i;
unsigned char *buffer;
/* read the message to our buffer */
buffer = (unsigned char *) dev->rd_msg_buf;
BUG_ON(heci_hdr->length >= sizeof(dev->rd_msg_buf));
heci_read_slots(dev, buffer, heci_hdr->length);
heci_msg = (struct heci_bus_message *) buffer;
switch (*(__u8 *) heci_msg) {
case HOST_START_RES_CMD:
version_res = (struct hbm_host_version_response *) heci_msg;
if (version_res->host_version_supported) {
dev->version.major_version = HBM_MAJOR_VERSION;
dev->version.minor_version = HBM_MINOR_VERSION;
} else {
dev->version = version_res->me_max_version;
}
dev->recvd_msg = 1;
DBG("host start response message received.\n");
break;
case CLIENT_CONNECT_RES_CMD:
connect_res =
(struct hbm_client_connect_response *) heci_msg;
heci_client_connect_response(dev, connect_res);
DBG("client connect response message received.\n");
wake_up(&dev->wait_recvd_msg);
break;
case CLIENT_DISCONNECT_RES_CMD:
disconnect_res =
(struct hbm_client_connect_response *) heci_msg;
heci_client_disconnect_response(dev, disconnect_res);
DBG("client disconnect response message received.\n");
wake_up(&dev->wait_recvd_msg);
break;
case HECI_FLOW_CONTROL_CMD:
flow_control = (struct hbm_flow_control *) heci_msg;
heci_client_flow_control_response(dev, flow_control);
DBG("client flow control response message received.\n");
break;
case HOST_CLIENT_PROPERTEIS_RES_CMD:
props_res = (struct hbm_props_response *) heci_msg;
if (props_res->status != 0) {
BUG();
break;
}
for (i = 0; i < dev->num_heci_me_clients; i++) {
if (dev->me_clients[i].client_id ==
props_res->address) {
dev->me_clients[i].props =
props_res->client_properties;
break;
}
}
dev->recvd_msg = 1;
break;
case HOST_ENUM_RES_CMD:
enum_res = (struct hbm_host_enum_response *) heci_msg;
memcpy(dev->heci_me_clients, enum_res->valid_addresses, 32);
dev->recvd_msg = 1;
break;
case HOST_STOP_RES_CMD:
dev->heci_state = HECI_DISABLED;
DBG("reseting because of FW stop response.\n");
heci_reset(dev, 1);
break;
case CLIENT_DISCONNECT_REQ_CMD:
/* search for client */
disconnect_req =
(struct hbm_client_disconnect_request *) heci_msg;
heci_client_disconnect_request(dev, disconnect_req);
break;
case ME_STOP_REQ_CMD:
/* prepare stop request */
heci_hdr = (struct heci_msg_hdr *) &dev->ext_msg_buf[0];
heci_hdr->host_addr = 0;
heci_hdr->me_addr = 0;
heci_hdr->length = sizeof(struct hbm_host_stop_request);
heci_hdr->msg_complete = 1;
heci_hdr->reserved = 0;
h_stop_req =
(struct hbm_host_stop_request *) &dev->ext_msg_buf[1];
memset(h_stop_req, 0, sizeof(struct hbm_host_stop_request));
h_stop_req->cmd.cmd = HOST_STOP_REQ_CMD;
h_stop_req->reason = DRIVER_STOP_REQUEST;
h_stop_req->reserved[0] = 0;
h_stop_req->reserved[1] = 0;
dev->extra_write_index = 2;
break;
default:
BUG();
break;
}
}
/**
* heci_bh_read_pthi_message - bottom half read routine after ISR to
* handle the read pthi message data processing.
*
* @complete_list: An instance of our list structure
* @dev: Device object for our driver
* @heci_hdr: header of pthi message
*
* returns 0 on success, <0 on failure.
*/
static int heci_bh_read_pthi_message(struct io_heci_list *complete_list,
struct iamt_heci_device *dev,
struct heci_msg_hdr *heci_hdr)
{
struct heci_file_private *file_ext;
struct heci_cb_private *priv_cb;
unsigned char *buffer;
BUG_ON(heci_hdr->me_addr != dev->iamthif_file_ext.me_client_id);
BUG_ON(dev->iamthif_state != HECI_IAMTHIF_READING);
buffer = (unsigned char *) (dev->iamthif_msg_buf +
dev->iamthif_msg_buf_index);
BUG_ON(sizeof(dev->iamthif_msg_buf) <
(dev->iamthif_msg_buf_index + heci_hdr->length));
heci_read_slots(dev, buffer, heci_hdr->length);
dev->iamthif_msg_buf_index += heci_hdr->length;
if (!(heci_hdr->msg_complete))
return 0;
DBG("pthi_message_buffer_index=%d\n", heci_hdr->length);
DBG("completed pthi read.\n ");
if (!dev->iamthif_current_cb)
return -ENODEV;
priv_cb = dev->iamthif_current_cb;
dev->iamthif_current_cb = NULL;
file_ext = (struct heci_file_private *)priv_cb->file_private;
if (!file_ext)
return -ENODEV;
dev->iamthif_stall_timer = 0;
priv_cb->information = dev->iamthif_msg_buf_index;
priv_cb->read_time = get_seconds();
if ((dev->iamthif_ioctl) && (file_ext == &dev->iamthif_file_ext)) {
/* found the iamthif cb */
DBG("complete the pthi read cb.\n ");
if (&dev->iamthif_file_ext) {
DBG("add the pthi read cb to complete.\n ");
list_add_tail(&priv_cb->cb_list,
&complete_list->heci_cb.cb_list);
}
}
return 0;
}
/**
* _heci_bh_state_ok - check if heci header matches file private data
*
* @file_ext: private data of the file object
* @heci_hdr: header of heci client message
*
* returns !=0 if matches, 0 if no match.
*/
static int _heci_bh_state_ok(struct heci_file_private *file_ext,
struct heci_msg_hdr *heci_hdr)
{
return ((file_ext->host_client_id == heci_hdr->host_addr)
&& (file_ext->me_client_id == heci_hdr->me_addr)
&& (file_ext->state == HECI_FILE_CONNECTED)
&& (HECI_READ_COMPLETE != file_ext->reading_state));
}
/**
* heci_bh_read_client_message - bottom half read routine after ISR to
* handle the read heci client message data processing.
*
* @complete_list: An instance of our list structure
* @dev: Device object for our driver
* @heci_hdr: header of heci client message
*
* returns 0 on success, <0 on failure.
*/
static int heci_bh_read_client_message(struct io_heci_list *complete_list,
struct iamt_heci_device *dev,
struct heci_msg_hdr *heci_hdr)
{
struct heci_file_private *file_ext;
struct heci_cb_private *priv_cb_pos = NULL, *priv_cb_next = NULL;
unsigned char *buffer = NULL;
DBG("start client msg\n");
if (!((dev->read_list.status == 0) &&
!list_empty(&dev->read_list.heci_cb.cb_list)))
goto quit;
list_for_each_entry_safe(priv_cb_pos, priv_cb_next,
&dev->read_list.heci_cb.cb_list, cb_list) {
file_ext = (struct heci_file_private *)
priv_cb_pos->file_private;
if ((file_ext != NULL) &&
(_heci_bh_state_ok(file_ext, heci_hdr))) {
spin_lock(&file_ext->read_io_lock);
file_ext->reading_state = HECI_READING;
buffer = (unsigned char *)
(priv_cb_pos->response_buffer.data +
priv_cb_pos->information);
BUG_ON(priv_cb_pos->response_buffer.size <
heci_hdr->length +
priv_cb_pos->information);
if (priv_cb_pos->response_buffer.size <
heci_hdr->length +
priv_cb_pos->information) {
DBG("message overflow.\n");
list_del(&priv_cb_pos->cb_list);
spin_unlock(&file_ext->read_io_lock);
return -ENOMEM;
}
if (buffer) {
heci_read_slots(dev, buffer,
heci_hdr->length);
}
priv_cb_pos->information += heci_hdr->length;
if (heci_hdr->msg_complete) {
file_ext->status = 0;
list_del(&priv_cb_pos->cb_list);
spin_unlock(&file_ext->read_io_lock);
DBG("completed read host client = %d,"
"ME client = %d, "
"data length = %lu\n",
file_ext->host_client_id,
file_ext->me_client_id,
priv_cb_pos->information);
*(priv_cb_pos->response_buffer.data +
priv_cb_pos->information) = '\0';
DBG("priv_cb_pos->res_buffer - %s\n",
priv_cb_pos->response_buffer.data);
list_add_tail(&priv_cb_pos->cb_list,
&complete_list->heci_cb.cb_list);
} else {
spin_unlock(&file_ext->read_io_lock);
}
break;
}
}
quit:
DBG("message read\n");
if (!buffer) {
heci_read_slots(dev, (unsigned char *) dev->rd_msg_buf,
heci_hdr->length);
DBG("discarding message, header=%08x.\n",
*(__u32 *) dev->rd_msg_buf);
}
return 0;
}
/**
* _heci_bh_iamthif_read - prepare to read iamthif data.
*
* @dev: Device object for our driver.
* @slots: free slots.
*
* returns 0, OK; otherwise, error.
*/
static int _heci_bh_iamthif_read(struct iamt_heci_device *dev, __s32 *slots)
{
if (((*slots) * sizeof(__u32)) >= (sizeof(struct heci_msg_hdr)
+ sizeof(struct hbm_flow_control))) {
*slots -= (sizeof(struct heci_msg_hdr) +
sizeof(struct hbm_flow_control) + 3) / 4;
if (!heci_send_flow_control(dev, &dev->iamthif_file_ext)) {
DBG("iamthif flow control failed\n");
} else {
DBG("iamthif flow control success\n");
dev->iamthif_state = HECI_IAMTHIF_READING;
dev->iamthif_flow_control_pending = 0;
dev->iamthif_msg_buf_index = 0;
dev->iamthif_msg_buf_size = 0;
dev->iamthif_stall_timer = IAMTHIF_STALL_TIMER;
dev->host_buffer_is_empty = host_buffer_is_empty(dev);
}
return 0;
} else {
return -ECOMPLETE_MESSAGE;
}
}
/**
* _heci_bh_close - process close related operation.
*
* @dev: Device object for our driver.
* @slots: free slots.
* @priv_cb_pos: callback block.
* @file_ext: private data of the file object.
* @cmpl_list: complete list.
*
* returns 0, OK; otherwise, error.
*/
static int _heci_bh_close(struct iamt_heci_device *dev, __s32 *slots,
struct heci_cb_private *priv_cb_pos,
struct heci_file_private *file_ext,
struct io_heci_list *cmpl_list)
{
if ((*slots * sizeof(__u32)) >= (sizeof(struct heci_msg_hdr) +
sizeof(struct hbm_client_disconnect_request))) {
*slots -= (sizeof(struct heci_msg_hdr) +
sizeof(struct hbm_client_disconnect_request) + 3) / 4;
if (!heci_disconnect(dev, file_ext)) {
file_ext->status = 0;
priv_cb_pos->information = 0;
list_move_tail(&priv_cb_pos->cb_list,
&cmpl_list->heci_cb.cb_list);
return -ECOMPLETE_MESSAGE;
} else {
file_ext->state = HECI_FILE_DISCONNECTING;
file_ext->status = 0;
priv_cb_pos->information = 0;
list_move_tail(&priv_cb_pos->cb_list,
&dev->ctrl_rd_list.heci_cb.cb_list);
file_ext->timer_count = HECI_CONNECT_TIMEOUT;
}
} else {
/* return the cancel routine */
return -ECORRUPTED_MESSAGE_HEADER;
}
return 0;
}
/**
* _heci_hb_close - process read related operation.
*
* @dev: Device object for our driver.
* @slots: free slots.
* @priv_cb_pos: callback block.
* @file_ext: private data of the file object.
* @cmpl_list: complete list.
*
* returns 0, OK; otherwise, error.
*/
static int _heci_bh_read(struct iamt_heci_device *dev, __s32 *slots,
struct heci_cb_private *priv_cb_pos,
struct heci_file_private *file_ext,
struct io_heci_list *cmpl_list)
{
if ((*slots * sizeof(__u32)) >= (sizeof(struct heci_msg_hdr) +
sizeof(struct hbm_flow_control))) {
*slots -= (sizeof(struct heci_msg_hdr) +
sizeof(struct hbm_flow_control) + 3) / 4;
if (!heci_send_flow_control(dev, file_ext)) {
file_ext->status = -ENODEV;
priv_cb_pos->information = 0;
list_move_tail(&priv_cb_pos->cb_list,
&cmpl_list->heci_cb.cb_list);
return -ENODEV;
} else {
list_move_tail(&priv_cb_pos->cb_list,
&dev->read_list.heci_cb.cb_list);
}
} else {
/* return the cancel routine */
list_del(&priv_cb_pos->cb_list);
return -ECORRUPTED_MESSAGE_HEADER;
}
return 0;
}
/**
* _heci_bh_ioctl - process ioctl related operation.
*
* @dev: Device object for our driver.
* @slots: free slots.
* @priv_cb_pos: callback block.
* @file_ext: private data of the file object.
* @cmpl_list: complete list.
*
* returns 0, OK; otherwise, error.
*/
static int _heci_bh_ioctl(struct iamt_heci_device *dev, __s32 *slots,
struct heci_cb_private *priv_cb_pos,
struct heci_file_private *file_ext,
struct io_heci_list *cmpl_list)
{
if ((*slots * sizeof(__u32)) >= (sizeof(struct heci_msg_hdr) +
sizeof(struct hbm_client_connect_request))) {
file_ext->state = HECI_FILE_CONNECTING;
*slots -= (sizeof(struct heci_msg_hdr) +
sizeof(struct hbm_client_connect_request) + 3) / 4;
if (!heci_connect(dev, file_ext)) {
file_ext->status = -ENODEV;
priv_cb_pos->information = 0;
list_del(&priv_cb_pos->cb_list);
return -ENODEV;
} else {
list_move_tail(&priv_cb_pos->cb_list,
&dev->ctrl_rd_list.heci_cb.cb_list);
file_ext->timer_count = HECI_CONNECT_TIMEOUT;
}
} else {
/* return the cancel routine */
list_del(&priv_cb_pos->cb_list);
return -ECORRUPTED_MESSAGE_HEADER;
}
return 0;
}
/**
* _heci_bh_cmpl - process completed and no-iamthif operation.
*
* @dev: Device object for our driver.
* @slots: free slots.
* @priv_cb_pos: callback block.
* @file_ext: private data of the file object.
* @cmpl_list: complete list.
*
* returns 0, OK; otherwise, error.
*/
static int _heci_bh_cmpl(struct iamt_heci_device *dev, __s32 *slots,
struct heci_cb_private *priv_cb_pos,
struct heci_file_private *file_ext,
struct io_heci_list *cmpl_list)
{
struct heci_msg_hdr *heci_hdr;
if ((*slots * sizeof(__u32)) >= (sizeof(struct heci_msg_hdr) +
(priv_cb_pos->request_buffer.size -
priv_cb_pos->information))) {
heci_hdr = (struct heci_msg_hdr *) &dev->wr_msg_buf[0];
heci_hdr->host_addr = file_ext->host_client_id;
heci_hdr->me_addr = file_ext->me_client_id;
heci_hdr->length = ((priv_cb_pos->request_buffer.size) -
(priv_cb_pos->information));
heci_hdr->msg_complete = 1;
heci_hdr->reserved = 0;
DBG("priv_cb_pos->request_buffer.size =%d"
"heci_hdr->msg_complete= %d\n",
priv_cb_pos->request_buffer.size,
heci_hdr->msg_complete);
DBG("priv_cb_pos->information =%lu\n",
priv_cb_pos->information);
DBG("heci_hdr->length =%d\n",
heci_hdr->length);
*slots -= (sizeof(struct heci_msg_hdr) +
heci_hdr->length + 3) / 4;
if (!heci_write_message(dev, heci_hdr,
(unsigned char *)
(priv_cb_pos->request_buffer.data +
priv_cb_pos->information),
heci_hdr->length)) {
file_ext->status = -ENODEV;
list_move_tail(&priv_cb_pos->cb_list,
&cmpl_list->heci_cb.cb_list);
return -ENODEV;
} else {
flow_ctrl_reduce(dev, file_ext);
file_ext->status = 0;
priv_cb_pos->information += heci_hdr->length;
list_move_tail(&priv_cb_pos->cb_list,
&dev->write_waiting_list.heci_cb.cb_list);
}
} else if (*slots == ((dev->host_hw_state & H_CBD) >> 24)) {
/* buffer is still empty */
heci_hdr = (struct heci_msg_hdr *) &dev->wr_msg_buf[0];
heci_hdr->host_addr = file_ext->host_client_id;
heci_hdr->me_addr = file_ext->me_client_id;
heci_hdr->length =
(*slots * sizeof(__u32)) - sizeof(struct heci_msg_hdr);
heci_hdr->msg_complete = 0;
heci_hdr->reserved = 0;
(*slots) -= (sizeof(struct heci_msg_hdr) +
heci_hdr->length + 3) / 4;
if (!heci_write_message(dev, heci_hdr,
(unsigned char *)
(priv_cb_pos->request_buffer.data +
priv_cb_pos->information),
heci_hdr->length)) {
file_ext->status = -ENODEV;
list_move_tail(&priv_cb_pos->cb_list,
&cmpl_list->heci_cb.cb_list);
return -ENODEV;
} else {
priv_cb_pos->information += heci_hdr->length;
DBG("priv_cb_pos->request_buffer.size =%d"
" heci_hdr->msg_complete= %d\n",
priv_cb_pos->request_buffer.size,
heci_hdr->msg_complete);
DBG("priv_cb_pos->information =%lu\n",
priv_cb_pos->information);
DBG("heci_hdr->length =%d\n", heci_hdr->length);
}
return -ECOMPLETE_MESSAGE;
} else {
return -ECORRUPTED_MESSAGE_HEADER;
}
return 0;
}
/**
* _heci_bh_cmpl_iamthif - process completed iamthif operation.
*
* @dev: Device object for our driver.
* @slots: free slots.
* @priv_cb_pos: callback block.
* @file_ext: private data of the file object.
* @cmpl_list: complete list.
*
* returns 0, OK; otherwise, error.
*/
static int _heci_bh_cmpl_iamthif(struct iamt_heci_device *dev, __s32 *slots,
struct heci_cb_private *priv_cb_pos,
struct heci_file_private *file_ext,
struct io_heci_list *cmpl_list)
{
struct heci_msg_hdr *heci_hdr;
if ((*slots * sizeof(__u32)) >= (sizeof(struct heci_msg_hdr) +
dev->iamthif_msg_buf_size -
dev->iamthif_msg_buf_index)) {
heci_hdr = (struct heci_msg_hdr *) &dev->wr_msg_buf[0];
heci_hdr->host_addr = file_ext->host_client_id;
heci_hdr->me_addr = file_ext->me_client_id;
heci_hdr->length = dev->iamthif_msg_buf_size -
dev->iamthif_msg_buf_index;
heci_hdr->msg_complete = 1;
heci_hdr->reserved = 0;
*slots -= (sizeof(struct heci_msg_hdr) +
heci_hdr->length + 3) / 4;
if (!heci_write_message(dev, heci_hdr,
(dev->iamthif_msg_buf +
dev->iamthif_msg_buf_index),
heci_hdr->length)) {
dev->iamthif_state = HECI_IAMTHIF_IDLE;
file_ext->status = -ENODEV;
list_del(&priv_cb_pos->cb_list);
return -ENODEV;
} else {
flow_ctrl_reduce(dev, file_ext);
dev->iamthif_msg_buf_index += heci_hdr->length;
priv_cb_pos->information = dev->iamthif_msg_buf_index;
file_ext->status = 0;
dev->iamthif_state = HECI_IAMTHIF_FLOW_CONTROL;
dev->iamthif_flow_control_pending = 1;
/* save iamthif cb sent to pthi client */
dev->iamthif_current_cb = priv_cb_pos;
list_move_tail(&priv_cb_pos->cb_list,
&dev->write_waiting_list.heci_cb.cb_list);
}
} else if (*slots == ((dev->host_hw_state & H_CBD) >> 24)) {
/* buffer is still empty */
heci_hdr = (struct heci_msg_hdr *) &dev->wr_msg_buf[0];
heci_hdr->host_addr = file_ext->host_client_id;
heci_hdr->me_addr = file_ext->me_client_id;
heci_hdr->length =
(*slots * sizeof(__u32)) - sizeof(struct heci_msg_hdr);
heci_hdr->msg_complete = 0;
heci_hdr->reserved = 0;
*slots -= (sizeof(struct heci_msg_hdr) +
heci_hdr->length + 3) / 4;
if (!heci_write_message(dev, heci_hdr,
(dev->iamthif_msg_buf +
dev->iamthif_msg_buf_index),
heci_hdr->length)) {
file_ext->status = -ENODEV;
list_del(&priv_cb_pos->cb_list);
} else {
dev->iamthif_msg_buf_index += heci_hdr->length;
}
return -ECOMPLETE_MESSAGE;
} else {
return -ECORRUPTED_MESSAGE_HEADER;
}
return 0;
}
/**
* heci_bh_write_handler - bottom half write routine after
* ISR to handle the write processing.
*
* @cmpl_list: An instance of our list structure
* @dev: Device object for our driver
* @slots: slots to write.
*
* returns 0 on success, <0 on failure.
*/
static int heci_bh_write_handler(struct io_heci_list *cmpl_list,
struct iamt_heci_device *dev,
__s32 *slots)
{
struct heci_file_private *file_ext;
struct heci_cb_private *priv_cb_pos = NULL, *priv_cb_next = NULL;
struct io_heci_list *list;
int ret;
if (!host_buffer_is_empty(dev)) {
DBG("host buffer is not empty.\n");
return 0;
}
dev->write_hang = -1;
*slots = count_empty_write_slots(dev);
/* complete all waiting for write CB */
DBG("complete all waiting for write cb.\n");
list = &dev->write_waiting_list;
if ((list->status == 0)
&& !list_empty(&list->heci_cb.cb_list)) {
list_for_each_entry_safe(priv_cb_pos, priv_cb_next,
&list->heci_cb.cb_list, cb_list) {
file_ext = (struct heci_file_private *)
priv_cb_pos->file_private;
if (file_ext != NULL) {
file_ext->status = 0;
list_del(&priv_cb_pos->cb_list);
if ((HECI_WRITING == file_ext->writing_state) &&
(priv_cb_pos->major_file_operations ==
HECI_WRITING) &&
(file_ext != &dev->iamthif_file_ext)) {
DBG("HECI WRITE COMPLETE\n");
file_ext->writing_state =
HECI_WRITE_COMPLETE;
list_add_tail(&priv_cb_pos->cb_list,
&cmpl_list->heci_cb.cb_list);
}
if (file_ext == &dev->iamthif_file_ext) {
DBG("check iamthif flow control.\n");
if (dev->iamthif_flow_control_pending) {
ret = _heci_bh_iamthif_read(dev,
slots);
if (ret != 0)
return ret;
}
}
}
}
}
if ((dev->stop) && (!dev->wd_pending)) {
dev->wd_stoped = 1;
wake_up_interruptible(&dev->wait_stop_wd);
return 0;
}
if (dev->extra_write_index != 0) {
DBG("extra_write_index =%d.\n", dev->extra_write_index);
heci_write_message(dev,
(struct heci_msg_hdr *) &dev->ext_msg_buf[0],
(unsigned char *) &dev->ext_msg_buf[1],
(dev->extra_write_index - 1) * sizeof(__u32));
*slots -= dev->extra_write_index;
dev->extra_write_index = 0;
}
if (dev->heci_state == HECI_ENABLED) {
if ((dev->wd_pending)
&& flow_ctrl_creds(dev, &dev->wd_file_ext)) {
if (!heci_send_wd(dev))
DBG("wd send failed.\n");
else
flow_ctrl_reduce(dev, &dev->wd_file_ext);
dev->wd_pending = 0;
if (dev->wd_timeout != 0) {
*slots -= (sizeof(struct heci_msg_hdr) +
HECI_START_WD_DATA_SIZE + 3) / 4;
dev->wd_due_counter = 2;
} else {
*slots -= (sizeof(struct heci_msg_hdr) +
HECI_WD_PARAMS_SIZE + 3) / 4;
dev->wd_due_counter = 0;
}
}
}
if (dev->stop)
return ~ENODEV;
/* complete control write list CB */
if (dev->ctrl_wr_list.status == 0) {
/* complete control write list CB */
DBG("complete control write list cb.\n");
list_for_each_entry_safe(priv_cb_pos, priv_cb_next,
&dev->ctrl_wr_list.heci_cb.cb_list, cb_list) {
file_ext = (struct heci_file_private *)
priv_cb_pos->file_private;
if (file_ext == NULL) {
list_del(&priv_cb_pos->cb_list);
return -ENODEV;
}
switch (priv_cb_pos->major_file_operations) {
case HECI_CLOSE:
/* send disconnect message */
ret = _heci_bh_close(dev, slots,
priv_cb_pos,
file_ext, cmpl_list);
if (ret != 0)
return ret;
break;
case HECI_READ:
/* send flow control message */
ret = _heci_bh_read(dev, slots,
priv_cb_pos,
file_ext, cmpl_list);
if (ret != 0)
return ret;
break;
case HECI_IOCTL:
/* connect message */
if (!other_client_is_connecting(dev, file_ext))
continue;
ret = _heci_bh_ioctl(dev, slots,
priv_cb_pos,
file_ext, cmpl_list);
if (ret != 0)
return ret;
break;
default:
BUG();
}
}
}
/* complete write list CB */
if ((dev->write_list.status == 0)
&& !list_empty(&dev->write_list.heci_cb.cb_list)) {
DBG("complete write list cb.\n");
list_for_each_entry_safe(priv_cb_pos, priv_cb_next,
&dev->write_list.heci_cb.cb_list, cb_list) {
file_ext = (struct heci_file_private *)
priv_cb_pos->file_private;
if (file_ext != NULL) {
if (file_ext != &dev->iamthif_file_ext) {
if (!flow_ctrl_creds(dev, file_ext)) {
DBG("No flow control"
" credentials for client"
" %d, not sending.\n",
file_ext->host_client_id);
continue;
}
ret = _heci_bh_cmpl(dev, slots,
priv_cb_pos,
file_ext,
cmpl_list);
if (ret != 0)
return ret;
} else if (file_ext == &dev->iamthif_file_ext) {
/* IAMTHIF IOCTL */
DBG("complete pthi write cb.\n");
if (!flow_ctrl_creds(dev, file_ext)) {
DBG("No flow control"
" credentials for pthi"
" client %d.\n",
file_ext->host_client_id);
continue;
}
ret = _heci_bh_cmpl_iamthif(dev, slots,
priv_cb_pos,
file_ext,
cmpl_list);
if (ret != 0)
return ret;
}
}
}
}
return 0;
}
/**
* is_treat_specially_client - check if the message belong
* to the file private data.
*
* @file_ext: private data of the file object
* @rs: connect response bus message
* @dev: Device object for our driver
*
* returns 0 on success, <0 on failure.
*/
static int is_treat_specially_client(struct heci_file_private *file_ext,
struct hbm_client_connect_response *rs)
{
int ret = 0;
if ((file_ext->host_client_id == rs->host_addr) &&
(file_ext->me_client_id == rs->me_addr)) {
if (rs->status == 0) {
DBG("client connect status = 0x%08x.\n", rs->status);
file_ext->state = HECI_FILE_CONNECTED;
file_ext->status = 0;
} else {
DBG("client connect status = 0x%08x.\n", rs->status);
file_ext->state = HECI_FILE_DISCONNECTED;
file_ext->status = -ENODEV;
}
ret = 1;
}
DBG("client state = %d.\n", file_ext->state);
return ret;
}
/**
* heci_client_connect_response - connect response bh routine
*
* @dev: Device object for our driver
* @rs: connect response bus message
*/
static void heci_client_connect_response(struct iamt_heci_device *dev,
struct hbm_client_connect_response *rs)
{
struct heci_file_private *file_ext;
struct heci_cb_private *priv_cb_pos = NULL, *priv_cb_next = NULL;
/* if WD or iamthif client treat specially */
if ((is_treat_specially_client(&(dev->wd_file_ext), rs)) ||
(is_treat_specially_client(&(dev->iamthif_file_ext), rs)))
return;
if (dev->ctrl_rd_list.status == 0
&& !list_empty(&dev->ctrl_rd_list.heci_cb.cb_list)) {
list_for_each_entry_safe(priv_cb_pos, priv_cb_next,
&dev->ctrl_rd_list.heci_cb.cb_list, cb_list) {
file_ext = (struct heci_file_private *)
priv_cb_pos->file_private;
if (file_ext == NULL) {
list_del(&priv_cb_pos->cb_list);
return;
}
if (HECI_IOCTL == priv_cb_pos->major_file_operations) {
if (is_treat_specially_client(file_ext, rs)) {
list_del(&priv_cb_pos->cb_list);
file_ext->status = 0;
file_ext->timer_count = 0;
break;
}
}
}
}
}
/**
* heci_client_disconnect_response - disconnect response bh routine
*
* @dev: Device object for our driver
* @rs: disconnect response bus message
*/
static void heci_client_disconnect_response(struct iamt_heci_device *dev,
struct hbm_client_connect_response *rs)
{
struct heci_file_private *file_ext;
struct heci_cb_private *priv_cb_pos = NULL, *priv_cb_next = NULL;
if (dev->ctrl_rd_list.status == 0
&& !list_empty(&dev->ctrl_rd_list.heci_cb.cb_list)) {
list_for_each_entry_safe(priv_cb_pos, priv_cb_next,
&dev->ctrl_rd_list.heci_cb.cb_list, cb_list) {
file_ext = (struct heci_file_private *)
priv_cb_pos->file_private;
if (file_ext == NULL) {
list_del(&priv_cb_pos->cb_list);
return;
}
DBG("list_for_each_entry_safe in ctrl_rd_list.\n");
if ((file_ext->host_client_id == rs->host_addr) &&
(file_ext->me_client_id == rs->me_addr)) {
list_del(&priv_cb_pos->cb_list);
if (rs->status == 0) {
file_ext->state =
HECI_FILE_DISCONNECTED;
}
file_ext->status = 0;
file_ext->timer_count = 0;
break;
}
}
}
}
/**
* same_flow_addr - tell they have same address.
*
* @file: private data of the file object.
* @flow: flow control.
*
* returns !=0, same; 0,not.
*/
static int same_flow_addr(struct heci_file_private *file,
struct hbm_flow_control *flow)
{
return ((file->host_client_id == flow->host_addr)
&& (file->me_client_id == flow->me_addr));
}
/**
* add_single_flow_creds - add single buffer credentials.
*
* @file: private data ot the file object.
* @flow: flow control.
*/
static void add_single_flow_creds(struct iamt_heci_device *dev,
struct hbm_flow_control *flow)
{
struct heci_me_client *client;
int i;
for (i = 0; i < dev->num_heci_me_clients; i++) {
client = &dev->me_clients[i];
if ((client != NULL) &&
(flow->me_addr == client->client_id)) {
if (client->props.single_recv_buf != 0) {
client->flow_ctrl_creds++;
DBG("recv flow ctrl msg ME %d (single).\n",
flow->me_addr);
DBG("flow control credentials=%d.\n",
client->flow_ctrl_creds);
} else {
BUG(); /* error in flow control */
}
}
}
}
/**
* heci_client_flow_control_response - flow control response bh routine
*
* @dev: Device object for our driver
* @flow_control: flow control response bus message
*/
static void heci_client_flow_control_response(struct iamt_heci_device *dev,
struct hbm_flow_control *flow_control)
{
struct heci_file_private *file_pos = NULL;
struct heci_file_private *file_next = NULL;
if (flow_control->host_addr == 0) {
/* single receive buffer */
add_single_flow_creds(dev, flow_control);
} else {
/* normal connection */
list_for_each_entry_safe(file_pos, file_next,
&dev->file_list, link) {
DBG("list_for_each_entry_safe in file_list\n");
DBG("file_ext of host client %d ME client %d.\n",
file_pos->host_client_id,
file_pos->me_client_id);
DBG("flow ctrl msg for host %d ME %d.\n",
flow_control->host_addr,
flow_control->me_addr);
if (same_flow_addr(file_pos, flow_control)) {
DBG("recv ctrl msg for host %d ME %d.\n",
flow_control->host_addr,
flow_control->me_addr);
file_pos->flow_ctrl_creds++;
DBG("flow control credentials=%d.\n",
file_pos->flow_ctrl_creds);
break;
}
}
}
}
/**
* same_disconn_addr - tell they have same address
*
* @file: private data of the file object.
* @disconn: disconnection request.
*
* returns !=0, same; 0,not.
*/
static int same_disconn_addr(struct heci_file_private *file,
struct hbm_client_disconnect_request *disconn)
{
return ((file->host_client_id == disconn->host_addr)
&& (file->me_client_id == disconn->me_addr));
}
/**
* heci_client_disconnect_request - disconnect request bh routine
*
* @dev: Device object for our driver.
* @disconnect_req: disconnect request bus message.
*/
static void heci_client_disconnect_request(struct iamt_heci_device *dev,
struct hbm_client_disconnect_request *disconnect_req)
{
struct heci_msg_hdr *heci_hdr;
struct hbm_client_connect_response *disconnect_res;
struct heci_file_private *file_pos = NULL;
struct heci_file_private *file_next = NULL;
list_for_each_entry_safe(file_pos, file_next, &dev->file_list, link) {
if (same_disconn_addr(file_pos, disconnect_req)) {
DBG("disconnect request host client %d ME client %d.\n",
disconnect_req->host_addr,
disconnect_req->me_addr);
file_pos->state = HECI_FILE_DISCONNECTED;
file_pos->timer_count = 0;
if (file_pos == &dev->wd_file_ext) {
dev->wd_due_counter = 0;
dev->wd_pending = 0;
} else if (file_pos == &dev->iamthif_file_ext)
dev->iamthif_timer = 0;
/* prepare disconnect response */
heci_hdr =
(struct heci_msg_hdr *) &dev->ext_msg_buf[0];
heci_hdr->host_addr = 0;
heci_hdr->me_addr = 0;
heci_hdr->length =
sizeof(struct hbm_client_connect_response);
heci_hdr->msg_complete = 1;
heci_hdr->reserved = 0;
disconnect_res =
(struct hbm_client_connect_response *)
&dev->ext_msg_buf[1];
disconnect_res->host_addr = file_pos->host_client_id;
disconnect_res->me_addr = file_pos->me_client_id;
*(__u8 *) (&disconnect_res->cmd) =
CLIENT_DISCONNECT_RES_CMD;
disconnect_res->status = 0;
dev->extra_write_index = 2;
break;
}
}
}
/**
* heci_timer - timer function.
*
* @data: pointer to the device structure
*
* NOTE: This function is called by timer interrupt work
*/
void heci_wd_timer(unsigned long data)
{
struct iamt_heci_device *dev = (struct iamt_heci_device *) data;
DBG("send watchdog.\n");
spin_lock_bh(&dev->device_lock);
if (dev->heci_state != HECI_ENABLED) {
mod_timer(&dev->wd_timer, round_jiffies(jiffies + 2 * HZ));
spin_unlock_bh(&dev->device_lock);
return;
}
if (dev->wd_file_ext.state != HECI_FILE_CONNECTED) {
mod_timer(&dev->wd_timer, round_jiffies(jiffies + 2 * HZ));
spin_unlock_bh(&dev->device_lock);
return;
}
/* Watchdog */
if ((dev->wd_due_counter != 0) && (dev->wd_bypass == 0)) {
if (--dev->wd_due_counter == 0) {
if (dev->host_buffer_is_empty &&
flow_ctrl_creds(dev, &dev->wd_file_ext)) {
dev->host_buffer_is_empty = 0;
if (!heci_send_wd(dev)) {
DBG("wd send failed.\n");
} else {
flow_ctrl_reduce(dev,
&dev->wd_file_ext);
}
if (dev->wd_timeout != 0)
dev->wd_due_counter = 2;
else
dev->wd_due_counter = 0;
} else
dev->wd_pending = 1;
}
}
if (dev->iamthif_stall_timer != 0) {
if (--dev->iamthif_stall_timer == 0) {
DBG("reseting because of hang to PTHI.\n");
heci_reset(dev, 1);
dev->iamthif_msg_buf_size = 0;
dev->iamthif_msg_buf_index = 0;
dev->iamthif_canceled = 0;
dev->iamthif_ioctl = 1;
dev->iamthif_state = HECI_IAMTHIF_IDLE;
dev->iamthif_timer = 0;
spin_unlock_bh(&dev->device_lock);
if (dev->iamthif_current_cb)
heci_free_cb_private(dev->iamthif_current_cb);
spin_lock_bh(&dev->device_lock);
dev->iamthif_file_object = NULL;
dev->iamthif_current_cb = NULL;
run_next_iamthif_cmd(dev);
}
}
mod_timer(&dev->wd_timer, round_jiffies(jiffies + 2 * HZ));
spin_unlock_bh(&dev->device_lock);
}