[PATCH 04/10] staging/mei: Interrupt handling.
From: Oren Weil
Date: Sun May 15 2011 - 06:46:46 EST
ISR and interrupt thread for handling incoming data.
e.g. read bus message, read client message, handle reset requests.
quick handler:
As MEI may share interrupt with GFX and/or USB
the HW register need to be checked and acknowledged.
thread handler:
Check if HW has data for read.
Write data to HW if possible.
May init reset flow on error
there can be two types of messages:
1) bus messages:
Management messages between MEI Driver and ME e.g.
Connect request/response,
Disconnect request/response
Enum clients request/response
Flow control request/response
those message are indicated by
ME Address/ID == 0 && Host Address/ID == 0
2) feature/client messages:
message that are sends between ME Feature/Client and
an application, the struct of the message is defined
by the ME Feature Protocol (e.g. APF Protocol, AMTHI Protocol)
those message are indicated by
ME Address/ID != 0 && Host Address/ID != 0
MEI Initialization state machine is also managed by this patch.
After MEI Reset is preform:
Send Start request
wait for answer
Send Enumerate Clients request
wait for answer
Send Get Client property for each client request
wait for answers
Init Done.
Signed-off-by: Tomas Winkler <tomas.winkler@xxxxxxxxx>
Signed-off-by: Itzhak Tzeel-Krupp <itzhak.tzeel-krupp@xxxxxxxxx>
Signed-off-by: Oren Weil <oren.jer.weil@xxxxxxxxx>
---
drivers/staging/mei/interrupt.c | 1624 +++++++++++++++++++++++++++++++++++++++
1 files changed, 1624 insertions(+), 0 deletions(-)
create mode 100644 drivers/staging/mei/interrupt.c
diff --git a/drivers/staging/mei/interrupt.c b/drivers/staging/mei/interrupt.c
new file mode 100644
index 0000000..d1b9214
--- /dev/null
+++ b/drivers/staging/mei/interrupt.c
@@ -0,0 +1,1624 @@
+/*
+ *
+ * Intel Management Engine Interface (Intel MEI) Linux driver
+ * Copyright (c) 2003-2011, 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 "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->major_file_operations == MEI_WRITE) {
+ mei_free_cb_private(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->major_file_operations == MEI_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_cmpl_iamthif - processes completed iamthif operation.
+ *
+ * @dev: the device structure.
+ * @cb_pos: callback block.
+ */
+static void _mei_cmpl_iamthif(struct mei_device *dev, struct mei_cl_cb *cb_pos)
+{
+ if (dev->iamthif_canceled != 1) {
+ dev->iamthif_state = MEI_IAMTHIF_READ_COMPLETE;
+ dev->iamthif_stall_timer = 0;
+ memcpy(cb_pos->response_buffer.data,
+ dev->iamthif_msg_buf,
+ dev->iamthif_msg_buf_index);
+ list_add_tail(&cb_pos->cb_list,
+ &dev->amthi_read_complete_list.mei_cb.cb_list);
+ dev_dbg(&dev->pdev->dev, "amthi read completed.\n");
+ dev->iamthif_timer = jiffies;
+ dev_dbg(&dev->pdev->dev, "dev->iamthif_timer = %ld\n",
+ dev->iamthif_timer);
+ } else {
+ run_next_iamthif_cmd(dev);
+ }
+
+ dev_dbg(&dev->pdev->dev, "completing amthi call back.\n");
+ wake_up_interruptible(&dev->iamthif_cl.wait);
+}
+
+
+/**
+ * mei_irq_thread_read_amthi_message - bottom half read routine after ISR to
+ * handle the read amthi message data processing.
+ *
+ * @complete_list: An instance of our list structure
+ * @dev: the device structure
+ * @mei_hdr: header of amthi message
+ *
+ * returns 0 on success, <0 on failure.
+ */
+static int mei_irq_thread_read_amthi_message(struct mei_io_list *complete_list,
+ struct mei_device *dev,
+ struct mei_msg_hdr *mei_hdr)
+{
+ struct mei_cl *cl;
+ struct mei_cl_cb *cb;
+ unsigned char *buffer;
+
+ BUG_ON(mei_hdr->me_addr != dev->iamthif_cl.me_client_id);
+ BUG_ON(dev->iamthif_state != MEI_IAMTHIF_READING);
+
+ buffer = (unsigned char *) (dev->iamthif_msg_buf +
+ dev->iamthif_msg_buf_index);
+ BUG_ON(dev->iamthif_mtu < dev->iamthif_msg_buf_index + mei_hdr->length);
+
+ mei_read_slots(dev, buffer, mei_hdr->length);
+
+ dev->iamthif_msg_buf_index += mei_hdr->length;
+
+ if (!mei_hdr->msg_complete)
+ return 0;
+
+ dev_dbg(&dev->pdev->dev,
+ "amthi_message_buffer_index =%d\n",
+ mei_hdr->length);
+
+ dev_dbg(&dev->pdev->dev, "completed amthi read.\n ");
+ if (!dev->iamthif_current_cb)
+ return -ENODEV;
+
+ cb = dev->iamthif_current_cb;
+ dev->iamthif_current_cb = NULL;
+
+ cl = (struct mei_cl *)cb->file_private;
+ if (!cl)
+ return -ENODEV;
+
+ dev->iamthif_stall_timer = 0;
+ cb->information = dev->iamthif_msg_buf_index;
+ cb->read_time = jiffies;
+ if (dev->iamthif_ioctl && cl == &dev->iamthif_cl) {
+ /* found the iamthif cb */
+ dev_dbg(&dev->pdev->dev, "complete the amthi read cb.\n ");
+ dev_dbg(&dev->pdev->dev, "add the amthi read cb to complete.\n ");
+ list_add_tail(&cb->cb_list,
+ &complete_list->mei_cb.cb_list);
+ }
+ return 0;
+}
+
+/**
+ * _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_io_list *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;
+
+ dev_dbg(&dev->pdev->dev, "start client msg\n");
+ if (!(dev->read_list.status == 0 &&
+ !list_empty(&dev->read_list.mei_cb.cb_list)))
+ goto quit;
+
+ list_for_each_entry_safe(cb_pos, cb_next,
+ &dev->read_list.mei_cb.cb_list, cb_list) {
+ cl = (struct mei_cl *)cb_pos->file_private;
+ if (cl && _mei_irq_thread_state_ok(cl, mei_hdr)) {
+ cl->reading_state = MEI_READING;
+ buffer = (unsigned char *)
+ (cb_pos->response_buffer.data +
+ cb_pos->information);
+ BUG_ON(cb_pos->response_buffer.size <
+ mei_hdr->length +
+ cb_pos->information);
+
+ if (cb_pos->response_buffer.size <
+ mei_hdr->length + cb_pos->information) {
+ dev_dbg(&dev->pdev->dev, "message overflow.\n");
+ list_del(&cb_pos->cb_list);
+ return -ENOMEM;
+ }
+ if (buffer)
+ mei_read_slots(dev, buffer, mei_hdr->length);
+
+ cb_pos->information += mei_hdr->length;
+ if (mei_hdr->msg_complete) {
+ cl->status = 0;
+ list_del(&cb_pos->cb_list);
+ dev_dbg(&dev->pdev->dev,
+ "completed read host client = %d,"
+ "ME client = %d, "
+ "data length = %lu\n",
+ cl->host_client_id,
+ cl->me_client_id,
+ cb_pos->information);
+
+ *(cb_pos->response_buffer.data +
+ cb_pos->information) = '\0';
+ dev_dbg(&dev->pdev->dev, "cb_pos->res_buffer - %s\n",
+ cb_pos->response_buffer.data);
+ list_add_tail(&cb_pos->cb_list,
+ &complete_list->mei_cb.cb_list);
+ }
+
+ break;
+ }
+
+ }
+
+quit:
+ dev_dbg(&dev->pdev->dev, "message read\n");
+ if (!buffer) {
+ mei_read_slots(dev, (unsigned char *) dev->rd_msg_buf,
+ mei_hdr->length);
+ dev_dbg(&dev->pdev->dev, "discarding message, header =%08x.\n",
+ *(u32 *) dev->rd_msg_buf);
+ }
+
+ return 0;
+}
+
+/**
+ * _mei_irq_thread_iamthif_read - prepares to read iamthif data.
+ *
+ * @dev: the device structure.
+ * @slots: free slots.
+ *
+ * returns 0, OK; otherwise, error.
+ */
+static int _mei_irq_thread_iamthif_read(struct mei_device *dev, s32 *slots)
+{
+
+ if (((*slots) * sizeof(u32)) >= (sizeof(struct mei_msg_hdr)
+ + sizeof(struct hbm_flow_control))) {
+ *slots -= (sizeof(struct mei_msg_hdr) +
+ sizeof(struct hbm_flow_control) + 3) / 4;
+ if (!mei_send_flow_control(dev, &dev->iamthif_cl)) {
+ dev_dbg(&dev->pdev->dev, "iamthif flow control failed\n");
+ } else {
+ dev_dbg(&dev->pdev->dev, "iamthif flow control success\n");
+ dev->iamthif_state = MEI_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->mei_host_buffer_is_empty =
+ mei_host_buffer_is_empty(dev);
+ }
+ return 0;
+ } else {
+ return -EMSGSIZE;
+ }
+}
+
+/**
+ * _mei_irq_thread_close - processes close related operation.
+ *
+ * @dev: the device structure.
+ * @slots: free slots.
+ * @cb_pos: callback block.
+ * @cl: private data of the file object.
+ * @cmpl_list: complete list.
+ *
+ * returns 0, OK; otherwise, error.
+ */
+static int _mei_irq_thread_close(struct mei_device *dev, s32 *slots,
+ struct mei_cl_cb *cb_pos,
+ struct mei_cl *cl,
+ struct mei_io_list *cmpl_list)
+{
+ if ((*slots * sizeof(u32)) >= (sizeof(struct mei_msg_hdr) +
+ sizeof(struct hbm_client_disconnect_request))) {
+ *slots -= (sizeof(struct mei_msg_hdr) +
+ sizeof(struct hbm_client_disconnect_request) + 3) / 4;
+
+ if (!mei_disconnect(dev, cl)) {
+ cl->status = 0;
+ cb_pos->information = 0;
+ list_move_tail(&cb_pos->cb_list,
+ &cmpl_list->mei_cb.cb_list);
+ return -EMSGSIZE;
+ } else {
+ cl->state = MEI_FILE_DISCONNECTING;
+ cl->status = 0;
+ cb_pos->information = 0;
+ list_move_tail(&cb_pos->cb_list,
+ &dev->ctrl_rd_list.mei_cb.cb_list);
+ cl->timer_count = MEI_CONNECT_TIMEOUT;
+ }
+ } else {
+ /* return the cancel routine */
+ return -EBADMSG;
+ }
+
+ return 0;
+}
+
+/**
+ * is_treat_specially_client - checks if the message belongs
+ * to the file private data.
+ *
+ * @cl: private data of the file object
+ * @rs: connect response bus message
+ *
+ */
+static bool is_treat_specially_client(struct mei_cl *cl,
+ struct hbm_client_connect_response *rs)
+{
+
+ if (cl->host_client_id == rs->host_addr &&
+ cl->me_client_id == rs->me_addr) {
+ if (!rs->status) {
+ cl->state = MEI_FILE_CONNECTED;
+ cl->status = 0;
+
+ } else {
+ cl->state = MEI_FILE_DISCONNECTED;
+ cl->status = -ENODEV;
+ }
+ cl->timer_count = 0;
+
+ return true;
+ }
+ return false;
+}
+
+/**
+ * mei_client_connect_response - connects to response irq routine
+ *
+ * @dev: the device structure
+ * @rs: connect response bus message
+ */
+static void mei_client_connect_response(struct mei_device *dev,
+ struct hbm_client_connect_response *rs)
+{
+
+ struct mei_cl *cl;
+ struct mei_cl_cb *cb_pos = NULL, *cb_next = NULL;
+
+ dev_dbg(&dev->pdev->dev,
+ "connect_response:\n"
+ "ME Client = %d\n"
+ "Host Client = %d\n"
+ "Status = %d\n",
+ rs->me_addr,
+ rs->host_addr,
+ rs->status);
+
+ /* if WD or iamthif client treat specially */
+
+ if (is_treat_specially_client(&(dev->wd_cl), rs)) {
+ dev_dbg(&dev->pdev->dev, "dev->wd_timeout =%d.\n",
+ dev->wd_timeout);
+
+ dev->wd_due_counter = (dev->wd_timeout) ? 1 : 0;
+
+ dev_dbg(&dev->pdev->dev, "successfully connected to WD client.\n");
+ host_init_iamthif(dev);
+ return;
+ }
+
+ if (is_treat_specially_client(&(dev->iamthif_cl), rs)) {
+ dev->iamthif_state = MEI_IAMTHIF_IDLE;
+ return;
+ }
+ if (!dev->ctrl_rd_list.status &&
+ !list_empty(&dev->ctrl_rd_list.mei_cb.cb_list)) {
+ list_for_each_entry_safe(cb_pos, cb_next,
+ &dev->ctrl_rd_list.mei_cb.cb_list, cb_list) {
+ cl = (struct mei_cl *)cb_pos->file_private;
+ if (!cl) {
+ list_del(&cb_pos->cb_list);
+ return;
+ }
+ if (MEI_IOCTL == cb_pos->major_file_operations) {
+ if (is_treat_specially_client(cl, rs)) {
+ list_del(&cb_pos->cb_list);
+ cl->status = 0;
+ cl->timer_count = 0;
+ break;
+ }
+ }
+ }
+ }
+}
+
+/**
+ * mei_client_disconnect_response - disconnects from response irq routine
+ *
+ * @dev: the device structure
+ * @rs: disconnect response bus message
+ */
+static void mei_client_disconnect_response(struct mei_device *dev,
+ struct hbm_client_connect_response *rs)
+{
+ struct mei_cl *cl;
+ struct mei_cl_cb *cb_pos = NULL, *cb_next = NULL;
+
+ dev_dbg(&dev->pdev->dev,
+ "disconnect_response:\n"
+ "ME Client = %d\n"
+ "Host Client = %d\n"
+ "Status = %d\n",
+ rs->me_addr,
+ rs->host_addr,
+ rs->status);
+
+ if (!dev->ctrl_rd_list.status &&
+ !list_empty(&dev->ctrl_rd_list.mei_cb.cb_list)) {
+ list_for_each_entry_safe(cb_pos, cb_next,
+ &dev->ctrl_rd_list.mei_cb.cb_list, cb_list) {
+ cl = (struct mei_cl *)cb_pos->file_private;
+
+ if (!cl) {
+ list_del(&cb_pos->cb_list);
+ return;
+ }
+
+ dev_dbg(&dev->pdev->dev, "list_for_each_entry_safe in ctrl_rd_list.\n");
+ if (cl->host_client_id == rs->host_addr &&
+ cl->me_client_id == rs->me_addr) {
+
+ list_del(&cb_pos->cb_list);
+ if (!rs->status)
+ cl->state = MEI_FILE_DISCONNECTED;
+
+ cl->status = 0;
+ cl->timer_count = 0;
+ break;
+ }
+ }
+ }
+}
+
+/**
+ * same_flow_addr - tells if they have the same address.
+ *
+ * @file: private data of the file object.
+ * @flow: flow control.
+ *
+ * returns !=0, same; 0,not.
+ */
+static int same_flow_addr(struct mei_cl *cl, struct hbm_flow_control *flow)
+{
+ return (cl->host_client_id == flow->host_addr &&
+ cl->me_client_id == flow->me_addr);
+}
+
+/**
+ * add_single_flow_creds - adds single buffer credentials.
+ *
+ * @file: private data ot the file object.
+ * @flow: flow control.
+ */
+static void add_single_flow_creds(struct mei_device *dev,
+ struct hbm_flow_control *flow)
+{
+ struct mei_me_client *client;
+ int i;
+
+ for (i = 0; i < dev->num_mei_me_clients; i++) {
+ client = &dev->me_clients[i];
+ if (client && flow->me_addr == client->client_id) {
+ if (client->props.single_recv_buf) {
+ client->mei_flow_ctrl_creds++;
+ dev_dbg(&dev->pdev->dev, "recv flow ctrl msg ME %d (single).\n",
+ flow->me_addr);
+ dev_dbg(&dev->pdev->dev, "flow control credentials =%d.\n",
+ client->mei_flow_ctrl_creds);
+ } else {
+ BUG(); /* error in flow control */
+ }
+ }
+ }
+}
+
+/**
+ * mei_client_flow_control_response - flow control response irq routine
+ *
+ * @dev: the device structure
+ * @flow_control: flow control response bus message
+ */
+static void mei_client_flow_control_response(struct mei_device *dev,
+ struct hbm_flow_control *flow_control)
+{
+ struct mei_cl *cl_pos = NULL;
+ struct mei_cl *cl_next = NULL;
+
+ if (!flow_control->host_addr) {
+ /* single receive buffer */
+ add_single_flow_creds(dev, flow_control);
+ } else {
+ /* normal connection */
+ list_for_each_entry_safe(cl_pos, cl_next,
+ &dev->file_list, link) {
+ dev_dbg(&dev->pdev->dev, "list_for_each_entry_safe in file_list\n");
+
+ dev_dbg(&dev->pdev->dev, "cl of host client %d ME client %d.\n",
+ cl_pos->host_client_id,
+ cl_pos->me_client_id);
+ dev_dbg(&dev->pdev->dev, "flow ctrl msg for host %d ME %d.\n",
+ flow_control->host_addr,
+ flow_control->me_addr);
+ if (same_flow_addr(cl_pos, flow_control)) {
+ dev_dbg(&dev->pdev->dev, "recv ctrl msg for host %d ME %d.\n",
+ flow_control->host_addr,
+ flow_control->me_addr);
+ cl_pos->mei_flow_ctrl_creds++;
+ dev_dbg(&dev->pdev->dev, "flow control credentials = %d.\n",
+ cl_pos->mei_flow_ctrl_creds);
+ break;
+ }
+ }
+ }
+}
+
+/**
+ * same_disconn_addr - tells if they have the same address
+ *
+ * @file: private data of the file object.
+ * @disconn: disconnection request.
+ *
+ * returns !=0, same; 0,not.
+ */
+static int same_disconn_addr(struct mei_cl *cl,
+ struct hbm_client_disconnect_request *disconn)
+{
+ return (cl->host_client_id == disconn->host_addr &&
+ cl->me_client_id == disconn->me_addr);
+}
+
+/**
+ * mei_client_disconnect_request - disconnects from request irq routine
+ *
+ * @dev: the device structure.
+ * @disconnect_req: disconnect request bus message.
+ */
+static void mei_client_disconnect_request(struct mei_device *dev,
+ struct hbm_client_disconnect_request *disconnect_req)
+{
+ struct mei_msg_hdr *mei_hdr;
+ struct hbm_client_connect_response *disconnect_res;
+ struct mei_cl *cl_pos = NULL;
+ struct mei_cl *cl_next = NULL;
+
+ list_for_each_entry_safe(cl_pos, cl_next, &dev->file_list, link) {
+ if (same_disconn_addr(cl_pos, disconnect_req)) {
+ dev_dbg(&dev->pdev->dev, "disconnect request host client %d ME client %d.\n",
+ disconnect_req->host_addr,
+ disconnect_req->me_addr);
+ cl_pos->state = MEI_FILE_DISCONNECTED;
+ cl_pos->timer_count = 0;
+ if (cl_pos == &dev->wd_cl) {
+ dev->wd_due_counter = 0;
+ dev->wd_pending = 0;
+ } else if (cl_pos == &dev->iamthif_cl)
+ dev->iamthif_timer = 0;
+
+ /* prepare disconnect response */
+ mei_hdr =
+ (struct mei_msg_hdr *) &dev->ext_msg_buf[0];
+ mei_hdr->host_addr = 0;
+ mei_hdr->me_addr = 0;
+ mei_hdr->length =
+ sizeof(struct hbm_client_connect_response);
+ mei_hdr->msg_complete = 1;
+ mei_hdr->reserved = 0;
+
+ disconnect_res =
+ (struct hbm_client_connect_response *)
+ &dev->ext_msg_buf[1];
+ disconnect_res->host_addr = cl_pos->host_client_id;
+ disconnect_res->me_addr = cl_pos->me_client_id;
+ *(u8 *) (&disconnect_res->cmd) =
+ CLIENT_DISCONNECT_RES_CMD;
+ disconnect_res->status = 0;
+ dev->extra_write_index = 2;
+ break;
+ }
+ }
+}
+
+
+/**
+ * mei_irq_thread_read_bus_message - bottom half read routine after ISR to
+ * handle the read bus message cmd processing.
+ *
+ * @dev: the device structure
+ * @mei_hdr: header of bus message
+ */
+static void mei_irq_thread_read_bus_message(struct mei_device *dev,
+ struct mei_msg_hdr *mei_hdr)
+{
+ struct mei_bus_message *mei_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 *host_stop_req;
+
+ unsigned char *buffer;
+
+ /* read the message to our buffer */
+ buffer = (unsigned char *) dev->rd_msg_buf;
+ BUG_ON(mei_hdr->length >= sizeof(dev->rd_msg_buf));
+ mei_read_slots(dev, buffer, mei_hdr->length);
+ mei_msg = (struct mei_bus_message *) buffer;
+
+ switch (*(u8 *) mei_msg) {
+ case HOST_START_RES_CMD:
+ version_res = (struct hbm_host_version_response *) mei_msg;
+ if (version_res->host_version_supported) {
+ dev->version.major_version = HBM_MAJOR_VERSION;
+ dev->version.minor_version = HBM_MINOR_VERSION;
+ if (dev->mei_state == MEI_INIT_CLIENTS &&
+ dev->init_clients_state == MEI_START_MESSAGE) {
+ dev->init_clients_timer = 0;
+ host_enum_clients_message(dev);
+ } else {
+ dev->recvd_msg = 0;
+ dev_dbg(&dev->pdev->dev, "IMEI reset due to received host start response bus message.\n");
+ mei_reset(dev, 1);
+ return;
+ }
+ } else {
+ dev->version = version_res->me_max_version;
+ /* send stop message */
+ mei_hdr->host_addr = 0;
+ mei_hdr->me_addr = 0;
+ mei_hdr->length = sizeof(struct hbm_host_stop_request);
+ mei_hdr->msg_complete = 1;
+ mei_hdr->reserved = 0;
+
+ host_stop_req = (struct hbm_host_stop_request *)
+ &dev->wr_msg_buf[1];
+
+ memset(host_stop_req,
+ 0,
+ sizeof(struct hbm_host_stop_request));
+ host_stop_req->cmd.cmd = HOST_STOP_REQ_CMD;
+ host_stop_req->reason = DRIVER_STOP_REQUEST;
+ mei_write_message(dev, mei_hdr,
+ (unsigned char *) (host_stop_req),
+ mei_hdr->length);
+ dev_dbg(&dev->pdev->dev, "version mismatch.\n");
+ return;
+ }
+
+ dev->recvd_msg = 1;
+ dev_dbg(&dev->pdev->dev, "host start response message received.\n");
+ break;
+
+ case CLIENT_CONNECT_RES_CMD:
+ connect_res =
+ (struct hbm_client_connect_response *) mei_msg;
+ mei_client_connect_response(dev, connect_res);
+ dev_dbg(&dev->pdev->dev, "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 *) mei_msg;
+ mei_client_disconnect_response(dev, disconnect_res);
+ dev_dbg(&dev->pdev->dev, "client disconnect response message received.\n");
+ wake_up(&dev->wait_recvd_msg);
+ break;
+
+ case MEI_FLOW_CONTROL_CMD:
+ flow_control = (struct hbm_flow_control *) mei_msg;
+ mei_client_flow_control_response(dev, flow_control);
+ dev_dbg(&dev->pdev->dev, "client flow control response message received.\n");
+ break;
+
+ case HOST_CLIENT_PROPERTIES_RES_CMD:
+ props_res = (struct hbm_props_response *)mei_msg;
+ if (props_res->status || !dev->me_clients) {
+ dev_dbg(&dev->pdev->dev, "reset due to received host client properties response bus message wrong status.\n");
+ mei_reset(dev, 1);
+ return;
+ }
+ if (dev->me_clients[dev->me_client_presentation_num]
+ .client_id == props_res->address) {
+
+ dev->me_clients[dev->me_client_presentation_num].props
+ = props_res->client_properties;
+
+ if (dev->mei_state == MEI_INIT_CLIENTS &&
+ dev->init_clients_state ==
+ MEI_CLIENT_PROPERTIES_MESSAGE) {
+ dev->me_client_index++;
+ dev->me_client_presentation_num++;
+ host_client_properties(dev);
+ } else {
+ dev_dbg(&dev->pdev->dev, "reset due to received host client properties response bus message");
+ mei_reset(dev, 1);
+ return;
+ }
+ } else {
+ dev_dbg(&dev->pdev->dev, "reset due to received host client properties response bus message for wrong client ID\n");
+ mei_reset(dev, 1);
+ return;
+ }
+ break;
+
+ case HOST_ENUM_RES_CMD:
+ enum_res = (struct hbm_host_enum_response *) mei_msg;
+ memcpy(dev->me_clients_map, enum_res->valid_addresses, 32);
+ if (dev->mei_state == MEI_INIT_CLIENTS &&
+ dev->init_clients_state == MEI_ENUM_CLIENTS_MESSAGE) {
+ dev->init_clients_timer = 0;
+ dev->me_client_presentation_num = 0;
+ dev->me_client_index = 0;
+ allocate_me_clients_storage(dev);
+ dev->init_clients_state =
+ MEI_CLIENT_PROPERTIES_MESSAGE;
+ host_client_properties(dev);
+ } else {
+ dev_dbg(&dev->pdev->dev, "reset due to received host enumeration clients response bus message.\n");
+ mei_reset(dev, 1);
+ return;
+ }
+ break;
+
+ case HOST_STOP_RES_CMD:
+ dev->mei_state = MEI_DISABLED;
+ dev_dbg(&dev->pdev->dev, "resetting because of FW stop response.\n");
+ mei_reset(dev, 1);
+ break;
+
+ case CLIENT_DISCONNECT_REQ_CMD:
+ /* search for client */
+ disconnect_req =
+ (struct hbm_client_disconnect_request *) mei_msg;
+ mei_client_disconnect_request(dev, disconnect_req);
+ break;
+
+ case ME_STOP_REQ_CMD:
+ /* prepare stop request */
+ mei_hdr = (struct mei_msg_hdr *) &dev->ext_msg_buf[0];
+ mei_hdr->host_addr = 0;
+ mei_hdr->me_addr = 0;
+ mei_hdr->length = sizeof(struct hbm_host_stop_request);
+ mei_hdr->msg_complete = 1;
+ mei_hdr->reserved = 0;
+ host_stop_req =
+ (struct hbm_host_stop_request *) &dev->ext_msg_buf[1];
+ memset(host_stop_req, 0, sizeof(struct hbm_host_stop_request));
+ host_stop_req->cmd.cmd = HOST_STOP_REQ_CMD;
+ host_stop_req->reason = DRIVER_STOP_REQUEST;
+ host_stop_req->reserved[0] = 0;
+ host_stop_req->reserved[1] = 0;
+ dev->extra_write_index = 2;
+ break;
+
+ default:
+ BUG();
+ break;
+
+ }
+}
+
+
+/**
+ * _mei_hb_read - processes read related operation.
+ *
+ * @dev: the device structure.
+ * @slots: free slots.
+ * @cb_pos: callback block.
+ * @cl: private data of the file object.
+ * @cmpl_list: complete list.
+ *
+ * returns 0, OK; otherwise, error.
+ */
+static int _mei_irq_thread_read(struct mei_device *dev, s32 *slots,
+ struct mei_cl_cb *cb_pos,
+ struct mei_cl *cl,
+ struct mei_io_list *cmpl_list)
+{
+ if ((*slots * sizeof(u32)) >= (sizeof(struct mei_msg_hdr) +
+ sizeof(struct hbm_flow_control))) {
+ *slots -= (sizeof(struct mei_msg_hdr) +
+ sizeof(struct hbm_flow_control) + 3) / 4;
+ if (!mei_send_flow_control(dev, cl)) {
+ cl->status = -ENODEV;
+ cb_pos->information = 0;
+ list_move_tail(&cb_pos->cb_list,
+ &cmpl_list->mei_cb.cb_list);
+ return -ENODEV;
+ } else {
+ list_move_tail(&cb_pos->cb_list,
+ &dev->read_list.mei_cb.cb_list);
+ }
+ } else {
+ /* return the cancel routine */
+ list_del(&cb_pos->cb_list);
+ return -EBADMSG;
+ }
+
+ return 0;
+}
+
+
+/**
+ * _mei_irq_thread_ioctl - processes ioctl related operation.
+ *
+ * @dev: the device structure.
+ * @slots: free slots.
+ * @cb_pos: callback block.
+ * @cl: private data of the file object.
+ * @cmpl_list: complete list.
+ *
+ * returns 0, OK; otherwise, error.
+ */
+static int _mei_irq_thread_ioctl(struct mei_device *dev, s32 *slots,
+ struct mei_cl_cb *cb_pos,
+ struct mei_cl *cl,
+ struct mei_io_list *cmpl_list)
+{
+ if ((*slots * sizeof(u32)) >= (sizeof(struct mei_msg_hdr) +
+ sizeof(struct hbm_client_connect_request))) {
+ cl->state = MEI_FILE_CONNECTING;
+ *slots -= (sizeof(struct mei_msg_hdr) +
+ sizeof(struct hbm_client_connect_request) + 3) / 4;
+ if (!mei_connect(dev, cl)) {
+ cl->status = -ENODEV;
+ cb_pos->information = 0;
+ list_del(&cb_pos->cb_list);
+ return -ENODEV;
+ } else {
+ list_move_tail(&cb_pos->cb_list,
+ &dev->ctrl_rd_list.mei_cb.cb_list);
+ cl->timer_count = MEI_CONNECT_TIMEOUT;
+ }
+ } else {
+ /* return the cancel routine */
+ list_del(&cb_pos->cb_list);
+ return -EBADMSG;
+ }
+
+ return 0;
+}
+
+/**
+ * _mei_irq_thread_cmpl - processes completed and no-iamthif operation.
+ *
+ * @dev: the device structure.
+ * @slots: free slots.
+ * @cb_pos: callback block.
+ * @cl: private data of the file object.
+ * @cmpl_list: complete list.
+ *
+ * returns 0, OK; otherwise, error.
+ */
+static int _mei_irq_thread_cmpl(struct mei_device *dev, s32 *slots,
+ struct mei_cl_cb *cb_pos,
+ struct mei_cl *cl,
+ struct mei_io_list *cmpl_list)
+{
+ struct mei_msg_hdr *mei_hdr;
+
+ if ((*slots * sizeof(u32)) >= (sizeof(struct mei_msg_hdr) +
+ (cb_pos->request_buffer.size -
+ cb_pos->information))) {
+ mei_hdr = (struct mei_msg_hdr *) &dev->wr_msg_buf[0];
+ mei_hdr->host_addr = cl->host_client_id;
+ mei_hdr->me_addr = cl->me_client_id;
+ mei_hdr->length = cb_pos->request_buffer.size -
+ cb_pos->information;
+ mei_hdr->msg_complete = 1;
+ mei_hdr->reserved = 0;
+ dev_dbg(&dev->pdev->dev, "cb_pos->request_buffer.size =%d"
+ "mei_hdr->msg_complete = %d\n",
+ cb_pos->request_buffer.size,
+ mei_hdr->msg_complete);
+ dev_dbg(&dev->pdev->dev, "cb_pos->information =%lu\n",
+ cb_pos->information);
+ dev_dbg(&dev->pdev->dev, "mei_hdr->length =%d\n",
+ mei_hdr->length);
+ *slots -= (sizeof(struct mei_msg_hdr) +
+ mei_hdr->length + 3) / 4;
+ if (!mei_write_message(dev, mei_hdr,
+ (unsigned char *)
+ (cb_pos->request_buffer.data +
+ cb_pos->information),
+ mei_hdr->length)) {
+ cl->status = -ENODEV;
+ list_move_tail(&cb_pos->cb_list,
+ &cmpl_list->mei_cb.cb_list);
+ return -ENODEV;
+ } else {
+ if (mei_flow_ctrl_reduce(dev, cl))
+ return -ENODEV;
+ cl->status = 0;
+ cb_pos->information += mei_hdr->length;
+ list_move_tail(&cb_pos->cb_list,
+ &dev->write_waiting_list.mei_cb.cb_list);
+ }
+ } else if (*slots == ((dev->host_hw_state & H_CBD) >> 24)) {
+ /* buffer is still empty */
+ mei_hdr = (struct mei_msg_hdr *) &dev->wr_msg_buf[0];
+ mei_hdr->host_addr = cl->host_client_id;
+ mei_hdr->me_addr = cl->me_client_id;
+ mei_hdr->length =
+ (*slots * sizeof(u32)) - sizeof(struct mei_msg_hdr);
+ mei_hdr->msg_complete = 0;
+ mei_hdr->reserved = 0;
+
+ (*slots) -= (sizeof(struct mei_msg_hdr) +
+ mei_hdr->length + 3) / 4;
+ if (!mei_write_message(dev, mei_hdr,
+ (unsigned char *)
+ (cb_pos->request_buffer.data +
+ cb_pos->information),
+ mei_hdr->length)) {
+ cl->status = -ENODEV;
+ list_move_tail(&cb_pos->cb_list,
+ &cmpl_list->mei_cb.cb_list);
+ return -ENODEV;
+ } else {
+ cb_pos->information += mei_hdr->length;
+ dev_dbg(&dev->pdev->dev,
+ "cb_pos->request_buffer.size =%d"
+ " mei_hdr->msg_complete = %d\n",
+ cb_pos->request_buffer.size,
+ mei_hdr->msg_complete);
+ dev_dbg(&dev->pdev->dev, "cb_pos->information =%lu\n",
+ cb_pos->information);
+ dev_dbg(&dev->pdev->dev, "mei_hdr->length =%d\n",
+ mei_hdr->length);
+ }
+ return -EMSGSIZE;
+ } else {
+ return -EBADMSG;
+ }
+
+ return 0;
+}
+
+/**
+ * _mei_irq_thread_cmpl_iamthif - processes completed iamthif operation.
+ *
+ * @dev: the device structure.
+ * @slots: free slots.
+ * @cb_pos: callback block.
+ * @cl: private data of the file object.
+ * @cmpl_list: complete list.
+ *
+ * returns 0, OK; otherwise, error.
+ */
+static int _mei_irq_thread_cmpl_iamthif(struct mei_device *dev, s32 *slots,
+ struct mei_cl_cb *cb_pos,
+ struct mei_cl *cl,
+ struct mei_io_list *cmpl_list)
+{
+ struct mei_msg_hdr *mei_hdr;
+
+ if ((*slots * sizeof(u32)) >= (sizeof(struct mei_msg_hdr) +
+ dev->iamthif_msg_buf_size -
+ dev->iamthif_msg_buf_index)) {
+ mei_hdr = (struct mei_msg_hdr *) &dev->wr_msg_buf[0];
+ mei_hdr->host_addr = cl->host_client_id;
+ mei_hdr->me_addr = cl->me_client_id;
+ mei_hdr->length = dev->iamthif_msg_buf_size -
+ dev->iamthif_msg_buf_index;
+ mei_hdr->msg_complete = 1;
+ mei_hdr->reserved = 0;
+
+ *slots -= (sizeof(struct mei_msg_hdr) +
+ mei_hdr->length + 3) / 4;
+
+ if (!mei_write_message(dev, mei_hdr,
+ (dev->iamthif_msg_buf +
+ dev->iamthif_msg_buf_index),
+ mei_hdr->length)) {
+ dev->iamthif_state = MEI_IAMTHIF_IDLE;
+ cl->status = -ENODEV;
+ list_del(&cb_pos->cb_list);
+ return -ENODEV;
+ } else {
+ if (mei_flow_ctrl_reduce(dev, cl))
+ return -ENODEV;
+ dev->iamthif_msg_buf_index += mei_hdr->length;
+ cb_pos->information = dev->iamthif_msg_buf_index;
+ cl->status = 0;
+ dev->iamthif_state = MEI_IAMTHIF_FLOW_CONTROL;
+ dev->iamthif_flow_control_pending = 1;
+ /* save iamthif cb sent to amthi client */
+ dev->iamthif_current_cb = cb_pos;
+ list_move_tail(&cb_pos->cb_list,
+ &dev->write_waiting_list.mei_cb.cb_list);
+
+ }
+ } else if (*slots == ((dev->host_hw_state & H_CBD) >> 24)) {
+ /* buffer is still empty */
+ mei_hdr = (struct mei_msg_hdr *) &dev->wr_msg_buf[0];
+ mei_hdr->host_addr = cl->host_client_id;
+ mei_hdr->me_addr = cl->me_client_id;
+ mei_hdr->length =
+ (*slots * sizeof(u32)) - sizeof(struct mei_msg_hdr);
+ mei_hdr->msg_complete = 0;
+ mei_hdr->reserved = 0;
+
+ *slots -= (sizeof(struct mei_msg_hdr) +
+ mei_hdr->length + 3) / 4;
+
+ if (!mei_write_message(dev, mei_hdr,
+ (dev->iamthif_msg_buf +
+ dev->iamthif_msg_buf_index),
+ mei_hdr->length)) {
+ cl->status = -ENODEV;
+ list_del(&cb_pos->cb_list);
+ } else {
+ dev->iamthif_msg_buf_index += mei_hdr->length;
+ }
+ return -EMSGSIZE;
+ } else {
+ return -EBADMSG;
+ }
+
+ return 0;
+}
+
+/**
+ * mei_irq_thread_read_handler - bottom half read routine after ISR to
+ * handle the read processing.
+ *
+ * @cmpl_list: An instance of our list structure
+ * @dev: the device structure
+ * @slots: slots to read.
+ *
+ * returns 0 on success, <0 on failure.
+ */
+static int mei_irq_thread_read_handler(struct mei_io_list *cmpl_list,
+ struct mei_device *dev,
+ s32 *slots)
+{
+ struct mei_msg_hdr *mei_hdr;
+ struct mei_cl *cl_pos = NULL;
+ struct mei_cl *cl_next = NULL;
+ int ret = 0;
+
+ if (!dev->rd_msg_hdr) {
+ dev->rd_msg_hdr = mei_mecbrw_read(dev);
+ dev_dbg(&dev->pdev->dev, "slots =%08x.\n", *slots);
+ (*slots)--;
+ dev_dbg(&dev->pdev->dev, "slots =%08x.\n", *slots);
+ }
+ mei_hdr = (struct mei_msg_hdr *) &dev->rd_msg_hdr;
+ dev_dbg(&dev->pdev->dev, "mei_hdr->length =%d\n", mei_hdr->length);
+
+ if (mei_hdr->reserved || !dev->rd_msg_hdr) {
+ dev_dbg(&dev->pdev->dev, "corrupted message header.\n");
+ ret = -EBADMSG;
+ goto end;
+ }
+
+ if (mei_hdr->host_addr || mei_hdr->me_addr) {
+ list_for_each_entry_safe(cl_pos, cl_next,
+ &dev->file_list, link) {
+ dev_dbg(&dev->pdev->dev,
+ "list_for_each_entry_safe read host"
+ " client = %d, ME client = %d\n",
+ cl_pos->host_client_id,
+ cl_pos->me_client_id);
+ if (cl_pos->host_client_id == mei_hdr->host_addr &&
+ cl_pos->me_client_id == mei_hdr->me_addr)
+ break;
+ }
+
+ if (&cl_pos->link == &dev->file_list) {
+ dev_dbg(&dev->pdev->dev, "corrupted message header\n");
+ ret = -EBADMSG;
+ goto end;
+ }
+ }
+ if (((*slots) * sizeof(u32)) < mei_hdr->length) {
+ dev_dbg(&dev->pdev->dev,
+ "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 (!mei_hdr->host_addr) {
+ dev_dbg(&dev->pdev->dev, "call mei_irq_thread_read_bus_message.\n");
+ mei_irq_thread_read_bus_message(dev, mei_hdr);
+ dev_dbg(&dev->pdev->dev, "end mei_irq_thread_read_bus_message.\n");
+ } else if (mei_hdr->host_addr == dev->iamthif_cl.host_client_id &&
+ (MEI_FILE_CONNECTED == dev->iamthif_cl.state) &&
+ (dev->iamthif_state == MEI_IAMTHIF_READING)) {
+ dev_dbg(&dev->pdev->dev, "call mei_irq_thread_read_iamthif_message.\n");
+ dev_dbg(&dev->pdev->dev, "mei_hdr->length =%d\n",
+ mei_hdr->length);
+ ret = mei_irq_thread_read_amthi_message(cmpl_list,
+ dev, mei_hdr);
+ if (ret)
+ goto end;
+
+ } else {
+ dev_dbg(&dev->pdev->dev, "call mei_irq_thread_read_client_message.\n");
+ ret = mei_irq_thread_read_client_message(cmpl_list,
+ dev, mei_hdr);
+ if (ret)
+ goto end;
+
+ }
+
+ /* reset the number of slots and header */
+ *slots = mei_count_full_read_slots(dev);
+ dev->rd_msg_hdr = 0;
+
+ if (*slots == -EOVERFLOW) {
+ /* overflow - reset */
+ dev_dbg(&dev->pdev->dev, "resetting due to slots overflow.\n");
+ /* set the event since message has been read */
+ ret = -ERANGE;
+ goto end;
+ }
+end:
+ return ret;
+}
+
+
+/**
+ * mei_irq_thread_write_handler - bottom half write routine after
+ * ISR to handle the write processing.
+ *
+ * @cmpl_list: An instance of our list structure
+ * @dev: the device structure
+ * @slots: slots to write.
+ *
+ * returns 0 on success, <0 on failure.
+ */
+static int mei_irq_thread_write_handler(struct mei_io_list *cmpl_list,
+ struct mei_device *dev,
+ s32 *slots)
+{
+
+ struct mei_cl *cl;
+ struct mei_cl_cb *cb_pos = NULL, *cb_next = NULL;
+ struct mei_io_list *list;
+ int ret;
+
+ if (!mei_host_buffer_is_empty(dev)) {
+ dev_dbg(&dev->pdev->dev, "host buffer is not empty.\n");
+ return 0;
+ }
+ dev->write_hang = -1;
+ *slots = mei_count_empty_write_slots(dev);
+ /* complete all waiting for write CB */
+ dev_dbg(&dev->pdev->dev, "complete all waiting for write cb.\n");
+
+ list = &dev->write_waiting_list;
+ if (!list->status && !list_empty(&list->mei_cb.cb_list)) {
+ list_for_each_entry_safe(cb_pos, cb_next,
+ &list->mei_cb.cb_list, cb_list) {
+ cl = (struct mei_cl *)cb_pos->file_private;
+ if (cl) {
+ cl->status = 0;
+ list_del(&cb_pos->cb_list);
+ if (MEI_WRITING == cl->writing_state &&
+ (cb_pos->major_file_operations ==
+ MEI_WRITE) &&
+ (cl != &dev->iamthif_cl)) {
+ dev_dbg(&dev->pdev->dev,
+ "MEI WRITE COMPLETE\n");
+ cl->writing_state =
+ MEI_WRITE_COMPLETE;
+ list_add_tail(&cb_pos->cb_list,
+ &cmpl_list->mei_cb.cb_list);
+ }
+ if (cl == &dev->iamthif_cl) {
+ dev_dbg(&dev->pdev->dev, "check iamthif flow control.\n");
+ if (dev->iamthif_flow_control_pending) {
+ ret =
+ _mei_irq_thread_iamthif_read(
+ dev, slots);
+ if (ret)
+ return ret;
+ }
+ }
+ }
+
+ }
+ }
+
+ if (dev->stop && !dev->wd_pending) {
+ dev->wd_stopped = 1;
+ wake_up_interruptible(&dev->wait_stop_wd);
+ return 0;
+ }
+
+ if (dev->extra_write_index) {
+ dev_dbg(&dev->pdev->dev, "extra_write_index =%d.\n",
+ dev->extra_write_index);
+ mei_write_message(dev,
+ (struct mei_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->mei_state == MEI_ENABLED) {
+ if (dev->wd_pending &&
+ mei_flow_ctrl_creds(dev, &dev->wd_cl) > 0) {
+ if (mei_wd_send(dev))
+ dev_dbg(&dev->pdev->dev, "wd send failed.\n");
+ else
+ if (mei_flow_ctrl_reduce(dev, &dev->wd_cl))
+ return -ENODEV;
+
+ dev->wd_pending = 0;
+
+ if (dev->wd_timeout) {
+ *slots -= (sizeof(struct mei_msg_hdr) +
+ MEI_START_WD_DATA_SIZE + 3) / 4;
+ dev->wd_due_counter = 2;
+ } else {
+ *slots -= (sizeof(struct mei_msg_hdr) +
+ MEI_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) {
+ /* complete control write list CB */
+ dev_dbg(&dev->pdev->dev, "complete control write list cb.\n");
+ list_for_each_entry_safe(cb_pos, cb_next,
+ &dev->ctrl_wr_list.mei_cb.cb_list, cb_list) {
+ cl = (struct mei_cl *)
+ cb_pos->file_private;
+ if (!cl) {
+ list_del(&cb_pos->cb_list);
+ return -ENODEV;
+ }
+ switch (cb_pos->major_file_operations) {
+ case MEI_CLOSE:
+ /* send disconnect message */
+ ret = _mei_irq_thread_close(dev, slots,
+ cb_pos, cl, cmpl_list);
+ if (ret)
+ return ret;
+
+ break;
+ case MEI_READ:
+ /* send flow control message */
+ ret = _mei_irq_thread_read(dev, slots,
+ cb_pos, cl, cmpl_list);
+ if (ret)
+ return ret;
+
+ break;
+ case MEI_IOCTL:
+ /* connect message */
+ if (!mei_other_client_is_connecting(dev,
+ cl))
+ continue;
+ ret = _mei_irq_thread_ioctl(dev, slots,
+ cb_pos, cl, cmpl_list);
+ if (ret)
+ return ret;
+
+ break;
+
+ default:
+ BUG();
+ }
+
+ }
+ }
+ /* complete write list CB */
+ if (!dev->write_list.status &&
+ !list_empty(&dev->write_list.mei_cb.cb_list)) {
+ dev_dbg(&dev->pdev->dev, "complete write list cb.\n");
+ list_for_each_entry_safe(cb_pos, cb_next,
+ &dev->write_list.mei_cb.cb_list, cb_list) {
+ cl = (struct mei_cl *)cb_pos->file_private;
+
+ if (cl) {
+ if (cl != &dev->iamthif_cl) {
+ if (!mei_flow_ctrl_creds(dev,
+ cl)) {
+ dev_dbg(&dev->pdev->dev,
+ "No flow control"
+ " credentials for client"
+ " %d, not sending.\n",
+ cl->host_client_id);
+ continue;
+ }
+ ret = _mei_irq_thread_cmpl(dev, slots,
+ cb_pos,
+ cl, cmpl_list);
+ if (ret)
+ return ret;
+
+ } else if (cl == &dev->iamthif_cl) {
+ /* IAMTHIF IOCTL */
+ dev_dbg(&dev->pdev->dev, "complete amthi write cb.\n");
+ if (!mei_flow_ctrl_creds(dev,
+ cl)) {
+ dev_dbg(&dev->pdev->dev,
+ "No flow control"
+ " credentials for amthi"
+ " client %d.\n",
+ cl->host_client_id);
+ continue;
+ }
+ ret = _mei_irq_thread_cmpl_iamthif(dev,
+ slots,
+ cb_pos,
+ cl,
+ cmpl_list);
+ if (ret)
+ return ret;
+
+ }
+ }
+
+ }
+ }
+ return 0;
+}
+
+
+
+/**
+ * mei_timer - timer function.
+ *
+ * @work: pointer to the work_struct structure
+ *
+ * NOTE: This function is called by timer interrupt work
+ */
+void mei_wd_timer(struct work_struct *work)
+{
+ unsigned long timeout;
+ struct mei_cl *cl_pos = NULL;
+ struct mei_cl *cl_next = NULL;
+ struct list_head *amthi_complete_list = NULL;
+ struct mei_cl_cb *cb_pos = NULL;
+ struct mei_cl_cb *cb_next = NULL;
+
+ struct mei_device *dev = container_of(work,
+ struct mei_device, wd_work.work);
+
+
+ mutex_lock(&dev->device_lock);
+ if (dev->mei_state != MEI_ENABLED) {
+ if (dev->mei_state == MEI_INIT_CLIENTS) {
+ if (dev->init_clients_timer) {
+ if (--dev->init_clients_timer == 0) {
+ dev_dbg(&dev->pdev->dev, "IMEI reset due to init clients timeout ,init clients state = %d.\n",
+ dev->init_clients_state);
+ mei_reset(dev, 1);
+ }
+ }
+ }
+ goto out;
+ }
+ /*** connect/disconnect timeouts ***/
+ list_for_each_entry_safe(cl_pos, cl_next, &dev->file_list, link) {
+ if (cl_pos->timer_count) {
+ if (--cl_pos->timer_count == 0) {
+ dev_dbg(&dev->pdev->dev, "HECI reset due to connect/disconnect timeout.\n");
+ mei_reset(dev, 1);
+ goto out;
+ }
+ }
+ }
+
+ if (dev->wd_cl.state != MEI_FILE_CONNECTED)
+ goto out;
+
+ /* Watchdog */
+ if (dev->wd_due_counter && !dev->wd_bypass) {
+ if (--dev->wd_due_counter == 0) {
+ if (dev->mei_host_buffer_is_empty &&
+ mei_flow_ctrl_creds(dev, &dev->wd_cl) > 0) {
+ dev->mei_host_buffer_is_empty = 0;
+ dev_dbg(&dev->pdev->dev, "send watchdog.\n");
+
+ if (mei_wd_send(dev))
+ dev_dbg(&dev->pdev->dev, "wd send failed.\n");
+ else
+ if (mei_flow_ctrl_reduce(dev, &dev->wd_cl))
+ goto out;
+
+ if (dev->wd_timeout)
+ dev->wd_due_counter = 2;
+ else
+ dev->wd_due_counter = 0;
+
+ } else
+ dev->wd_pending = 1;
+
+ }
+ }
+ if (dev->iamthif_stall_timer) {
+ if (--dev->iamthif_stall_timer == 0) {
+ dev_dbg(&dev->pdev->dev, "reseting because of hang to amthi.\n");
+ mei_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 = MEI_IAMTHIF_IDLE;
+ dev->iamthif_timer = 0;
+
+ if (dev->iamthif_current_cb)
+ mei_free_cb_private(dev->iamthif_current_cb);
+
+ dev->iamthif_file_object = NULL;
+ dev->iamthif_current_cb = NULL;
+ run_next_iamthif_cmd(dev);
+ }
+ }
+
+ if (dev->iamthif_timer) {
+
+ timeout = dev->iamthif_timer +
+ msecs_to_jiffies(IAMTHIF_READ_TIMER);
+
+ dev_dbg(&dev->pdev->dev, "dev->iamthif_timer = %ld\n",
+ dev->iamthif_timer);
+ dev_dbg(&dev->pdev->dev, "timeout = %ld\n", timeout);
+ dev_dbg(&dev->pdev->dev, "jiffies = %ld\n", jiffies);
+ if (time_after(jiffies, timeout)) {
+ /*
+ * User didn't read the AMTHI data on time (15sec)
+ * freeing AMTHI for other requests
+ */
+
+ dev_dbg(&dev->pdev->dev, "freeing AMTHI for other requests\n");
+
+ amthi_complete_list = &dev->amthi_read_complete_list.
+ mei_cb.cb_list;
+
+ if (!list_empty(amthi_complete_list)) {
+
+ list_for_each_entry_safe(cb_pos, cb_next,
+ amthi_complete_list,
+ cb_list) {
+
+ cl_pos = cb_pos->file_object->private_data;
+
+ /* Finding the AMTHI entry. */
+ if (cl_pos == &dev->iamthif_cl)
+ list_del(&cb_pos->cb_list);
+ }
+ }
+ if (dev->iamthif_current_cb)
+ mei_free_cb_private(dev->iamthif_current_cb);
+
+ dev->iamthif_file_object->private_data = NULL;
+ dev->iamthif_file_object = NULL;
+ dev->iamthif_current_cb = NULL;
+ dev->iamthif_timer = 0;
+ run_next_iamthif_cmd(dev);
+
+ }
+ }
+out:
+ schedule_delayed_work(&dev->wd_work, 2 * HZ);
+ mutex_unlock(&dev->device_lock);
+}
+
+/**
+ * mei_interrupt_thread_handler - function called after ISR to handle the interrupt
+ * processing.
+ *
+ * @irq: The irq number
+ * @dev_id: pointer to the device structure
+ *
+ * returns irqreturn_t
+ *
+ */
+irqreturn_t mei_interrupt_thread_handler(int irq, void *dev_id)
+{
+ struct mei_device *dev = (struct mei_device *) dev_id;
+ struct mei_io_list complete_list;
+ struct mei_cl_cb *cb_pos = NULL, *cb_next = NULL;
+ struct mei_cl *cl;
+ s32 slots;
+ int rets;
+ bool bus_message_received;
+
+
+ dev_dbg(&dev->pdev->dev, "function called after ISR to handle the interrupt processing.\n");
+ /* initialize our complete list */
+ mutex_lock(&dev->device_lock);
+ mei_initialize_list(&complete_list, dev);
+ dev->host_hw_state = mei_hcsr_read(dev);
+ dev->me_hw_state = mei_mecsr_read(dev);
+
+ /* check if ME wants a reset */
+ if ((dev->me_hw_state & ME_RDY_HRA) == 0 &&
+ dev->mei_state != MEI_RESETING &&
+ dev->mei_state != MEI_INITIALIZING) {
+ dev_dbg(&dev->pdev->dev, "FW not ready.\n");
+ mei_reset(dev, 1);
+ mutex_unlock(&dev->device_lock);
+ return IRQ_HANDLED;
+ }
+
+ /* 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) {
+ dev_dbg(&dev->pdev->dev, "we need to start the dev.\n");
+ dev->host_hw_state |= (H_IE | H_IG | H_RDY);
+ mei_hcsr_set(dev);
+ dev->mei_state = MEI_INIT_CLIENTS;
+ dev_dbg(&dev->pdev->dev, "link is established start sending messages.\n");
+ /* link is established
+ * start sending messages.
+ */
+ host_start_message(dev);
+ mutex_unlock(&dev->device_lock);
+ return IRQ_HANDLED;
+ } else {
+ dev_dbg(&dev->pdev->dev, "FW not ready.\n");
+ mutex_unlock(&dev->device_lock);
+ return IRQ_HANDLED;
+ }
+ }
+ /* check slots avalable for reading */
+ slots = mei_count_full_read_slots(dev);
+ dev_dbg(&dev->pdev->dev, "slots =%08x extra_write_index =%08x.\n",
+ slots, dev->extra_write_index);
+ while (slots > 0 && !dev->extra_write_index) {
+ dev_dbg(&dev->pdev->dev, "slots =%08x extra_write_index =%08x.\n",
+ slots, dev->extra_write_index);
+ dev_dbg(&dev->pdev->dev, "call mei_irq_thread_read_handler.\n");
+ rets = mei_irq_thread_read_handler(&complete_list, dev, &slots);
+ if (rets)
+ goto end;
+ }
+ rets = mei_irq_thread_write_handler(&complete_list, dev, &slots);
+end:
+ dev_dbg(&dev->pdev->dev, "end of bottom half function.\n");
+ dev->host_hw_state = mei_hcsr_read(dev);
+ dev->mei_host_buffer_is_empty = mei_host_buffer_is_empty(dev);
+
+ bus_message_received = false;
+ if (dev->recvd_msg && waitqueue_active(&dev->wait_recvd_msg)) {
+ dev_dbg(&dev->pdev->dev, "received waiting bus message\n");
+ bus_message_received = true;
+ }
+ mutex_unlock(&dev->device_lock);
+ if (bus_message_received) {
+ dev_dbg(&dev->pdev->dev, "wake up dev->wait_recvd_msg\n");
+ wake_up_interruptible(&dev->wait_recvd_msg);
+ bus_message_received = false;
+ }
+ if (complete_list.status || list_empty(&complete_list.mei_cb.cb_list))
+ return IRQ_HANDLED;
+
+
+ list_for_each_entry_safe(cb_pos, cb_next,
+ &complete_list.mei_cb.cb_list, cb_list) {
+ cl = (struct mei_cl *)cb_pos->file_private;
+ list_del(&cb_pos->cb_list);
+ if (cl) {
+ if (cl != &dev->iamthif_cl) {
+ dev_dbg(&dev->pdev->dev, "completing call back.\n");
+ _mei_cmpl(cl, cb_pos);
+ cb_pos = NULL;
+ } else if (cl == &dev->iamthif_cl) {
+ _mei_cmpl_iamthif(dev, cb_pos);
+ }
+ }
+ }
+ return IRQ_HANDLED;
+}
--
1.7.1
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