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path: root/drivers/misc/mei/iorw.c
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Diffstat (limited to 'drivers/misc/mei/iorw.c')
-rw-r--r--drivers/misc/mei/iorw.c590
1 files changed, 590 insertions, 0 deletions
diff --git a/drivers/misc/mei/iorw.c b/drivers/misc/mei/iorw.c
new file mode 100644
index 000000000000..f9cced69b65e
--- /dev/null
+++ b/drivers/misc/mei/iorw.c
@@ -0,0 +1,590 @@
+/*
+ *
+ * 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/kernel.h>
+#include <linux/fs.h>
+#include <linux/errno.h>
+#include <linux/types.h>
+#include <linux/fcntl.h>
+#include <linux/aio.h>
+#include <linux/pci.h>
+#include <linux/init.h>
+#include <linux/ioctl.h>
+#include <linux/cdev.h>
+#include <linux/list.h>
+#include <linux/delay.h>
+#include <linux/sched.h>
+#include <linux/uuid.h>
+#include <linux/jiffies.h>
+#include <linux/uaccess.h>
+
+
+#include "mei_dev.h"
+#include "hw.h"
+#include <linux/mei.h>
+#include "interface.h"
+
+
+
+/**
+ * mei_ioctl_connect_client - the connect to fw client IOCTL function
+ *
+ * @dev: the device structure
+ * @data: IOCTL connect data, input and output parameters
+ * @file: private data of the file object
+ *
+ * Locking: called under "dev->device_lock" lock
+ *
+ * returns 0 on success, <0 on failure.
+ */
+int mei_ioctl_connect_client(struct file *file,
+ struct mei_connect_client_data *data)
+{
+ struct mei_device *dev;
+ struct mei_cl_cb *cb;
+ struct mei_client *client;
+ struct mei_cl *cl;
+ struct mei_cl *cl_pos = NULL;
+ struct mei_cl *cl_next = NULL;
+ long timeout = CONNECT_TIMEOUT;
+ int i;
+ int err;
+ int rets;
+
+ cl = file->private_data;
+ if (WARN_ON(!cl || !cl->dev))
+ return -ENODEV;
+
+ dev = cl->dev;
+
+ dev_dbg(&dev->pdev->dev, "mei_ioctl_connect_client() Entry\n");
+
+
+ /* buffered ioctl cb */
+ cb = kzalloc(sizeof(struct mei_cl_cb), GFP_KERNEL);
+ if (!cb) {
+ rets = -ENOMEM;
+ goto end;
+ }
+ INIT_LIST_HEAD(&cb->cb_list);
+
+ cb->major_file_operations = MEI_IOCTL;
+
+ if (dev->mei_state != MEI_ENABLED) {
+ rets = -ENODEV;
+ goto end;
+ }
+ if (cl->state != MEI_FILE_INITIALIZING &&
+ cl->state != MEI_FILE_DISCONNECTED) {
+ rets = -EBUSY;
+ goto end;
+ }
+
+ /* find ME client we're trying to connect to */
+ i = mei_find_me_client_index(dev, data->in_client_uuid);
+ if (i >= 0 && !dev->me_clients[i].props.fixed_address) {
+ cl->me_client_id = dev->me_clients[i].client_id;
+ cl->state = MEI_FILE_CONNECTING;
+ }
+
+ dev_dbg(&dev->pdev->dev, "Connect to FW Client ID = %d\n",
+ cl->me_client_id);
+ dev_dbg(&dev->pdev->dev, "FW Client - Protocol Version = %d\n",
+ dev->me_clients[i].props.protocol_version);
+ dev_dbg(&dev->pdev->dev, "FW Client - Max Msg Len = %d\n",
+ dev->me_clients[i].props.max_msg_length);
+
+ /* if we're connecting to amthi client then we will use the
+ * existing connection
+ */
+ if (uuid_le_cmp(data->in_client_uuid, mei_amthi_guid) == 0) {
+ dev_dbg(&dev->pdev->dev, "FW Client is amthi\n");
+ if (dev->iamthif_cl.state != MEI_FILE_CONNECTED) {
+ rets = -ENODEV;
+ goto end;
+ }
+ clear_bit(cl->host_client_id, dev->host_clients_map);
+ list_for_each_entry_safe(cl_pos, cl_next,
+ &dev->file_list, link) {
+ if (mei_cl_cmp_id(cl, cl_pos)) {
+ dev_dbg(&dev->pdev->dev,
+ "remove file private data node host"
+ " client = %d, ME client = %d.\n",
+ cl_pos->host_client_id,
+ cl_pos->me_client_id);
+ list_del(&cl_pos->link);
+ }
+
+ }
+ dev_dbg(&dev->pdev->dev, "free file private data memory.\n");
+ kfree(cl);
+
+ cl = NULL;
+ file->private_data = &dev->iamthif_cl;
+
+ client = &data->out_client_properties;
+ client->max_msg_length =
+ dev->me_clients[i].props.max_msg_length;
+ client->protocol_version =
+ dev->me_clients[i].props.protocol_version;
+ rets = dev->iamthif_cl.status;
+
+ goto end;
+ }
+
+ if (cl->state != MEI_FILE_CONNECTING) {
+ rets = -ENODEV;
+ goto end;
+ }
+
+
+ /* prepare the output buffer */
+ client = &data->out_client_properties;
+ client->max_msg_length = dev->me_clients[i].props.max_msg_length;
+ client->protocol_version = dev->me_clients[i].props.protocol_version;
+ dev_dbg(&dev->pdev->dev, "Can connect?\n");
+ if (dev->mei_host_buffer_is_empty
+ && !mei_other_client_is_connecting(dev, cl)) {
+ dev_dbg(&dev->pdev->dev, "Sending Connect Message\n");
+ dev->mei_host_buffer_is_empty = false;
+ if (mei_connect(dev, cl)) {
+ dev_dbg(&dev->pdev->dev, "Sending connect message - failed\n");
+ rets = -ENODEV;
+ goto end;
+ } else {
+ dev_dbg(&dev->pdev->dev, "Sending connect message - succeeded\n");
+ cl->timer_count = MEI_CONNECT_TIMEOUT;
+ cb->file_private = cl;
+ list_add_tail(&cb->cb_list,
+ &dev->ctrl_rd_list.mei_cb.
+ cb_list);
+ }
+
+
+ } else {
+ dev_dbg(&dev->pdev->dev, "Queuing the connect request due to device busy\n");
+ cb->file_private = cl;
+ dev_dbg(&dev->pdev->dev, "add connect cb to control write list.\n");
+ list_add_tail(&cb->cb_list,
+ &dev->ctrl_wr_list.mei_cb.cb_list);
+ }
+ mutex_unlock(&dev->device_lock);
+ err = wait_event_timeout(dev->wait_recvd_msg,
+ (MEI_FILE_CONNECTED == cl->state ||
+ MEI_FILE_DISCONNECTED == cl->state),
+ timeout * HZ);
+
+ mutex_lock(&dev->device_lock);
+ if (MEI_FILE_CONNECTED == cl->state) {
+ dev_dbg(&dev->pdev->dev, "successfully connected to FW client.\n");
+ rets = cl->status;
+ goto end;
+ } else {
+ dev_dbg(&dev->pdev->dev, "failed to connect to FW client.cl->state = %d.\n",
+ cl->state);
+ if (!err) {
+ dev_dbg(&dev->pdev->dev,
+ "wait_event_interruptible_timeout failed on client"
+ " connect message fw response message.\n");
+ }
+ rets = -EFAULT;
+
+ mei_io_list_flush(&dev->ctrl_rd_list, cl);
+ mei_io_list_flush(&dev->ctrl_wr_list, cl);
+ goto end;
+ }
+ rets = 0;
+end:
+ dev_dbg(&dev->pdev->dev, "free connect cb memory.");
+ kfree(cb);
+ return rets;
+}
+
+/**
+ * find_amthi_read_list_entry - finds a amthilist entry for current file
+ *
+ * @dev: the device structure
+ * @file: pointer to file object
+ *
+ * returns returned a list entry on success, NULL on failure.
+ */
+struct mei_cl_cb *find_amthi_read_list_entry(
+ struct mei_device *dev,
+ struct file *file)
+{
+ struct mei_cl *cl_temp;
+ struct mei_cl_cb *pos = NULL;
+ struct mei_cl_cb *next = NULL;
+
+ list_for_each_entry_safe(pos, next,
+ &dev->amthi_read_complete_list.mei_cb.cb_list, cb_list) {
+ cl_temp = (struct mei_cl *)pos->file_private;
+ if (cl_temp && cl_temp == &dev->iamthif_cl &&
+ pos->file_object == file)
+ return pos;
+ }
+ return NULL;
+}
+
+/**
+ * amthi_read - read data from AMTHI client
+ *
+ * @dev: the device structure
+ * @if_num: minor number
+ * @file: pointer to file object
+ * @*ubuf: pointer to user data in user space
+ * @length: data length to read
+ * @offset: data read offset
+ *
+ * Locking: called under "dev->device_lock" lock
+ *
+ * returns
+ * returned data length on success,
+ * zero if no data to read,
+ * negative on failure.
+ */
+int amthi_read(struct mei_device *dev, struct file *file,
+ char __user *ubuf, size_t length, loff_t *offset)
+{
+ int rets;
+ int wait_ret;
+ struct mei_cl_cb *cb = NULL;
+ struct mei_cl *cl = file->private_data;
+ unsigned long timeout;
+ int i;
+
+ /* Only Posible if we are in timeout */
+ if (!cl || cl != &dev->iamthif_cl) {
+ dev_dbg(&dev->pdev->dev, "bad file ext.\n");
+ return -ETIMEDOUT;
+ }
+
+ for (i = 0; i < dev->me_clients_num; i++) {
+ if (dev->me_clients[i].client_id ==
+ dev->iamthif_cl.me_client_id)
+ break;
+ }
+
+ if (i == dev->me_clients_num) {
+ dev_dbg(&dev->pdev->dev, "amthi client not found.\n");
+ return -ENODEV;
+ }
+ if (WARN_ON(dev->me_clients[i].client_id != cl->me_client_id))
+ return -ENODEV;
+
+ dev_dbg(&dev->pdev->dev, "checking amthi data\n");
+ cb = find_amthi_read_list_entry(dev, file);
+
+ /* Check for if we can block or not*/
+ if (cb == NULL && file->f_flags & O_NONBLOCK)
+ return -EAGAIN;
+
+
+ dev_dbg(&dev->pdev->dev, "waiting for amthi data\n");
+ while (cb == NULL) {
+ /* unlock the Mutex */
+ mutex_unlock(&dev->device_lock);
+
+ wait_ret = wait_event_interruptible(dev->iamthif_cl.wait,
+ (cb = find_amthi_read_list_entry(dev, file)));
+
+ if (wait_ret)
+ return -ERESTARTSYS;
+
+ dev_dbg(&dev->pdev->dev, "woke up from sleep\n");
+
+ /* Locking again the Mutex */
+ mutex_lock(&dev->device_lock);
+ }
+
+
+ dev_dbg(&dev->pdev->dev, "Got amthi data\n");
+ dev->iamthif_timer = 0;
+
+ if (cb) {
+ timeout = cb->read_time +
+ msecs_to_jiffies(IAMTHIF_READ_TIMER);
+ dev_dbg(&dev->pdev->dev, "amthi timeout = %lud\n",
+ timeout);
+
+ if (time_after(jiffies, timeout)) {
+ dev_dbg(&dev->pdev->dev, "amthi Time out\n");
+ /* 15 sec for the message has expired */
+ list_del(&cb->cb_list);
+ rets = -ETIMEDOUT;
+ goto free;
+ }
+ }
+ /* if the whole message will fit remove it from the list */
+ if (cb->information >= *offset && length >= (cb->information - *offset))
+ list_del(&cb->cb_list);
+ else if (cb->information > 0 && cb->information <= *offset) {
+ /* end of the message has been reached */
+ list_del(&cb->cb_list);
+ rets = 0;
+ goto free;
+ }
+ /* else means that not full buffer will be read and do not
+ * remove message from deletion list
+ */
+
+ dev_dbg(&dev->pdev->dev, "amthi cb->response_buffer size - %d\n",
+ cb->response_buffer.size);
+ dev_dbg(&dev->pdev->dev, "amthi cb->information - %lu\n",
+ cb->information);
+
+ /* length is being turncated to PAGE_SIZE, however,
+ * the information may be longer */
+ length = min_t(size_t, length, (cb->information - *offset));
+
+ if (copy_to_user(ubuf, cb->response_buffer.data + *offset, length))
+ rets = -EFAULT;
+ else {
+ rets = length;
+ if ((*offset + length) < cb->information) {
+ *offset += length;
+ goto out;
+ }
+ }
+free:
+ dev_dbg(&dev->pdev->dev, "free amthi cb memory.\n");
+ *offset = 0;
+ mei_free_cb_private(cb);
+out:
+ return rets;
+}
+
+/**
+ * mei_start_read - the start read client message function.
+ *
+ * @dev: the device structure
+ * @if_num: minor number
+ * @cl: private data of the file object
+ *
+ * returns 0 on success, <0 on failure.
+ */
+int mei_start_read(struct mei_device *dev, struct mei_cl *cl)
+{
+ struct mei_cl_cb *cb;
+ int rets = 0;
+ int i;
+
+ if (cl->state != MEI_FILE_CONNECTED)
+ return -ENODEV;
+
+ if (dev->mei_state != MEI_ENABLED)
+ return -ENODEV;
+
+ dev_dbg(&dev->pdev->dev, "check if read is pending.\n");
+ if (cl->read_pending || cl->read_cb) {
+ dev_dbg(&dev->pdev->dev, "read is pending.\n");
+ return -EBUSY;
+ }
+
+ cb = kzalloc(sizeof(struct mei_cl_cb), GFP_KERNEL);
+ if (!cb)
+ return -ENOMEM;
+
+ dev_dbg(&dev->pdev->dev, "allocation call back successful. host client = %d, ME client = %d\n",
+ cl->host_client_id, cl->me_client_id);
+
+ for (i = 0; i < dev->me_clients_num; i++) {
+ if (dev->me_clients[i].client_id == cl->me_client_id)
+ break;
+
+ }
+
+ if (WARN_ON(dev->me_clients[i].client_id != cl->me_client_id)) {
+ rets = -ENODEV;
+ goto unlock;
+ }
+
+ if (i == dev->me_clients_num) {
+ rets = -ENODEV;
+ goto unlock;
+ }
+
+ cb->response_buffer.size = dev->me_clients[i].props.max_msg_length;
+ cb->response_buffer.data =
+ kmalloc(cb->response_buffer.size, GFP_KERNEL);
+ if (!cb->response_buffer.data) {
+ rets = -ENOMEM;
+ goto unlock;
+ }
+ dev_dbg(&dev->pdev->dev, "allocation call back data success.\n");
+ cb->major_file_operations = MEI_READ;
+ /* make sure information is zero before we start */
+ cb->information = 0;
+ cb->file_private = (void *) cl;
+ cl->read_cb = cb;
+ if (dev->mei_host_buffer_is_empty) {
+ dev->mei_host_buffer_is_empty = false;
+ if (mei_send_flow_control(dev, cl)) {
+ rets = -ENODEV;
+ goto unlock;
+ }
+ list_add_tail(&cb->cb_list, &dev->read_list.mei_cb.cb_list);
+ } else {
+ list_add_tail(&cb->cb_list, &dev->ctrl_wr_list.mei_cb.cb_list);
+ }
+ return rets;
+unlock:
+ mei_free_cb_private(cb);
+ return rets;
+}
+
+/**
+ * amthi_write - write iamthif data to amthi client
+ *
+ * @dev: the device structure
+ * @cb: mei call back struct
+ *
+ * returns 0 on success, <0 on failure.
+ */
+int amthi_write(struct mei_device *dev, struct mei_cl_cb *cb)
+{
+ struct mei_msg_hdr mei_hdr;
+ int ret;
+
+ if (!dev || !cb)
+ return -ENODEV;
+
+ dev_dbg(&dev->pdev->dev, "write data to amthi client.\n");
+
+ dev->iamthif_state = MEI_IAMTHIF_WRITING;
+ dev->iamthif_current_cb = cb;
+ dev->iamthif_file_object = cb->file_object;
+ dev->iamthif_canceled = false;
+ dev->iamthif_ioctl = true;
+ dev->iamthif_msg_buf_size = cb->request_buffer.size;
+ memcpy(dev->iamthif_msg_buf, cb->request_buffer.data,
+ cb->request_buffer.size);
+
+ ret = mei_flow_ctrl_creds(dev, &dev->iamthif_cl);
+ if (ret < 0)
+ return ret;
+
+ if (ret && dev->mei_host_buffer_is_empty) {
+ ret = 0;
+ dev->mei_host_buffer_is_empty = false;
+ if (cb->request_buffer.size >
+ (((dev->host_hw_state & H_CBD) >> 24) * sizeof(u32))
+ -sizeof(struct mei_msg_hdr)) {
+ mei_hdr.length =
+ (((dev->host_hw_state & H_CBD) >> 24) *
+ sizeof(u32)) - sizeof(struct mei_msg_hdr);
+ mei_hdr.msg_complete = 0;
+ } else {
+ mei_hdr.length = cb->request_buffer.size;
+ mei_hdr.msg_complete = 1;
+ }
+
+ mei_hdr.host_addr = dev->iamthif_cl.host_client_id;
+ mei_hdr.me_addr = dev->iamthif_cl.me_client_id;
+ mei_hdr.reserved = 0;
+ dev->iamthif_msg_buf_index += mei_hdr.length;
+ if (mei_write_message(dev, &mei_hdr,
+ (unsigned char *)(dev->iamthif_msg_buf),
+ mei_hdr.length))
+ return -ENODEV;
+
+ if (mei_hdr.msg_complete) {
+ if (mei_flow_ctrl_reduce(dev, &dev->iamthif_cl))
+ return -ENODEV;
+ dev->iamthif_flow_control_pending = true;
+ dev->iamthif_state = MEI_IAMTHIF_FLOW_CONTROL;
+ dev_dbg(&dev->pdev->dev, "add amthi cb to write waiting list\n");
+ dev->iamthif_current_cb = cb;
+ dev->iamthif_file_object = cb->file_object;
+ list_add_tail(&cb->cb_list,
+ &dev->write_waiting_list.mei_cb.cb_list);
+ } else {
+ dev_dbg(&dev->pdev->dev, "message does not complete, "
+ "so add amthi cb to write list.\n");
+ list_add_tail(&cb->cb_list,
+ &dev->write_list.mei_cb.cb_list);
+ }
+ } else {
+ if (!(dev->mei_host_buffer_is_empty))
+ dev_dbg(&dev->pdev->dev, "host buffer is not empty");
+
+ dev_dbg(&dev->pdev->dev, "No flow control credentials, "
+ "so add iamthif cb to write list.\n");
+ list_add_tail(&cb->cb_list, &dev->write_list.mei_cb.cb_list);
+ }
+ return 0;
+}
+
+/**
+ * iamthif_ioctl_send_msg - send cmd data to amthi client
+ *
+ * @dev: the device structure
+ *
+ * returns 0 on success, <0 on failure.
+ */
+void mei_run_next_iamthif_cmd(struct mei_device *dev)
+{
+ struct mei_cl *cl_tmp;
+ struct mei_cl_cb *pos = NULL;
+ struct mei_cl_cb *next = NULL;
+ int status;
+
+ if (!dev)
+ return;
+
+ dev->iamthif_msg_buf_size = 0;
+ dev->iamthif_msg_buf_index = 0;
+ dev->iamthif_canceled = false;
+ dev->iamthif_ioctl = true;
+ dev->iamthif_state = MEI_IAMTHIF_IDLE;
+ dev->iamthif_timer = 0;
+ dev->iamthif_file_object = NULL;
+
+ dev_dbg(&dev->pdev->dev, "complete amthi cmd_list cb.\n");
+
+ list_for_each_entry_safe(pos, next,
+ &dev->amthi_cmd_list.mei_cb.cb_list, cb_list) {
+ list_del(&pos->cb_list);
+ cl_tmp = (struct mei_cl *)pos->file_private;
+
+ if (cl_tmp && cl_tmp == &dev->iamthif_cl) {
+ status = amthi_write(dev, pos);
+ if (status) {
+ dev_dbg(&dev->pdev->dev,
+ "amthi write failed status = %d\n",
+ status);
+ return;
+ }
+ break;
+ }
+ }
+}
+
+/**
+ * mei_free_cb_private - free mei_cb_private related memory
+ *
+ * @cb: mei callback struct
+ */
+void mei_free_cb_private(struct mei_cl_cb *cb)
+{
+ if (cb == NULL)
+ return;
+
+ kfree(cb->request_buffer.data);
+ kfree(cb->response_buffer.data);
+ kfree(cb);
+}