diff options
Diffstat (limited to 'drivers/misc/mei/main.c')
| -rw-r--r-- | drivers/misc/mei/main.c | 1230 |
1 files changed, 1230 insertions, 0 deletions
diff --git a/drivers/misc/mei/main.c b/drivers/misc/mei/main.c new file mode 100644 index 0000000..c703332 --- /dev/null +++ b/drivers/misc/mei/main.c @@ -0,0 +1,1230 @@ +/* + * + * 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. + * + */ + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include <linux/module.h> +#include <linux/moduleparam.h> +#include <linux/kernel.h> +#include <linux/device.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/poll.h> +#include <linux/init.h> +#include <linux/ioctl.h> +#include <linux/cdev.h> +#include <linux/sched.h> +#include <linux/uuid.h> +#include <linux/compat.h> +#include <linux/jiffies.h> +#include <linux/interrupt.h> +#include <linux/miscdevice.h> + +#include "mei_dev.h" +#include <linux/mei.h> +#include "interface.h" + +static const char mei_driver_name[] = "mei"; + +/* The device pointer */ +/* Currently this driver works as long as there is only a single AMT device. */ +struct pci_dev *mei_device; + +/* mei_pci_tbl - PCI Device ID Table */ +static DEFINE_PCI_DEVICE_TABLE(mei_pci_tbl) = { + {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_82946GZ)}, + {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_82G35)}, + {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_82Q965)}, + {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_82G965)}, + {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_82GM965)}, + {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_82GME965)}, + {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9_82Q35)}, + {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9_82G33)}, + {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9_82Q33)}, + {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9_82X38)}, + {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9_3200)}, + {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9_6)}, + {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9_7)}, + {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9_8)}, + {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9_9)}, + {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9_10)}, + {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9M_1)}, + {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9M_2)}, + {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9M_3)}, + {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9M_4)}, + {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH10_1)}, + {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH10_2)}, + {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH10_3)}, + {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH10_4)}, + {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_IBXPK_1)}, + {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_IBXPK_2)}, + {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_CPT_1)}, + {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_PBG_1)}, + {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_PPT_1)}, + {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_PPT_2)}, + {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_PPT_3)}, + + /* required last entry */ + {0, } +}; + +MODULE_DEVICE_TABLE(pci, mei_pci_tbl); + +static DEFINE_MUTEX(mei_mutex); + + +/** + * mei_clear_list - removes all callbacks associated with file + * from mei_cb_list + * + * @dev: device structure. + * @file: file structure + * @mei_cb_list: callbacks list + * + * mei_clear_list is called to clear resources associated with file + * when application calls close function or Ctrl-C was pressed + * + * returns true if callback removed from the list, false otherwise + */ +static bool mei_clear_list(struct mei_device *dev, + struct file *file, struct list_head *mei_cb_list) +{ + struct mei_cl_cb *cb_pos = NULL; + struct mei_cl_cb *cb_next = NULL; + struct file *file_temp; + bool removed = false; + + /* list all list member */ + list_for_each_entry_safe(cb_pos, cb_next, mei_cb_list, cb_list) { + file_temp = (struct file *)cb_pos->file_object; + /* check if list member associated with a file */ + if (file_temp == file) { + /* remove member from the list */ + list_del(&cb_pos->cb_list); + /* check if cb equal to current iamthif cb */ + if (dev->iamthif_current_cb == cb_pos) { + dev->iamthif_current_cb = NULL; + /* send flow control to iamthif client */ + mei_send_flow_control(dev, &dev->iamthif_cl); + } + /* free all allocated buffers */ + mei_free_cb_private(cb_pos); + cb_pos = NULL; + removed = true; + } + } + return removed; +} + +/** + * mei_clear_lists - removes all callbacks associated with file + * + * @dev: device structure + * @file: file structure + * + * mei_clear_lists is called to clear resources associated with file + * when application calls close function or Ctrl-C was pressed + * + * returns true if callback removed from the list, false otherwise + */ +static bool mei_clear_lists(struct mei_device *dev, struct file *file) +{ + bool removed = false; + + /* remove callbacks associated with a file */ + mei_clear_list(dev, file, &dev->amthi_cmd_list.mei_cb.cb_list); + if (mei_clear_list(dev, file, + &dev->amthi_read_complete_list.mei_cb.cb_list)) + removed = true; + + mei_clear_list(dev, file, &dev->ctrl_rd_list.mei_cb.cb_list); + + if (mei_clear_list(dev, file, &dev->ctrl_wr_list.mei_cb.cb_list)) + removed = true; + + if (mei_clear_list(dev, file, &dev->write_waiting_list.mei_cb.cb_list)) + removed = true; + + if (mei_clear_list(dev, file, &dev->write_list.mei_cb.cb_list)) + removed = true; + + /* check if iamthif_current_cb not NULL */ + if (dev->iamthif_current_cb && !removed) { + /* check file and iamthif current cb association */ + if (dev->iamthif_current_cb->file_object == file) { + /* remove cb */ + mei_free_cb_private(dev->iamthif_current_cb); + dev->iamthif_current_cb = NULL; + removed = true; + } + } + return removed; +} +/** + * find_read_list_entry - find read list entry + * + * @dev: device structure + * @file: pointer to file structure + * + * returns cb on success, NULL on error + */ +static struct mei_cl_cb *find_read_list_entry( + struct mei_device *dev, + struct mei_cl *cl) +{ + struct mei_cl_cb *pos = NULL; + struct mei_cl_cb *next = NULL; + + dev_dbg(&dev->pdev->dev, "remove read_list CB\n"); + list_for_each_entry_safe(pos, next, + &dev->read_list.mei_cb.cb_list, cb_list) { + struct mei_cl *cl_temp; + cl_temp = (struct mei_cl *)pos->file_private; + + if (mei_cl_cmp_id(cl, cl_temp)) + return pos; + } + return NULL; +} + +/** + * mei_open - the open function + * + * @inode: pointer to inode structure + * @file: pointer to file structure + * + * returns 0 on success, <0 on error + */ +static int mei_open(struct inode *inode, struct file *file) +{ + struct mei_cl *cl; + struct mei_device *dev; + unsigned long cl_id; + int err; + + err = -ENODEV; + if (!mei_device) + goto out; + + dev = pci_get_drvdata(mei_device); + if (!dev) + goto out; + + mutex_lock(&dev->device_lock); + err = -ENOMEM; + cl = mei_cl_allocate(dev); + if (!cl) + goto out_unlock; + + err = -ENODEV; + if (dev->mei_state != MEI_ENABLED) { + dev_dbg(&dev->pdev->dev, "mei_state != MEI_ENABLED mei_state= %d\n", + dev->mei_state); + goto out_unlock; + } + err = -EMFILE; + if (dev->open_handle_count >= MEI_MAX_OPEN_HANDLE_COUNT) + goto out_unlock; + + cl_id = find_first_zero_bit(dev->host_clients_map, MEI_CLIENTS_MAX); + if (cl_id >= MEI_CLIENTS_MAX) + goto out_unlock; + + cl->host_client_id = cl_id; + + dev_dbg(&dev->pdev->dev, "client_id = %d\n", cl->host_client_id); + + dev->open_handle_count++; + + list_add_tail(&cl->link, &dev->file_list); + + set_bit(cl->host_client_id, dev->host_clients_map); + cl->state = MEI_FILE_INITIALIZING; + cl->sm_state = 0; + + file->private_data = cl; + mutex_unlock(&dev->device_lock); + + return nonseekable_open(inode, file); + +out_unlock: + mutex_unlock(&dev->device_lock); + kfree(cl); +out: + return err; +} + +/** + * mei_release - the release function + * + * @inode: pointer to inode structure + * @file: pointer to file structure + * + * returns 0 on success, <0 on error + */ +static int mei_release(struct inode *inode, struct file *file) +{ + struct mei_cl *cl = file->private_data; + struct mei_cl_cb *cb; + struct mei_device *dev; + int rets = 0; + + if (WARN_ON(!cl || !cl->dev)) + return -ENODEV; + + dev = cl->dev; + + mutex_lock(&dev->device_lock); + if (cl != &dev->iamthif_cl) { + if (cl->state == MEI_FILE_CONNECTED) { + cl->state = MEI_FILE_DISCONNECTING; + dev_dbg(&dev->pdev->dev, + "disconnecting client host client = %d, " + "ME client = %d\n", + cl->host_client_id, + cl->me_client_id); + rets = mei_disconnect_host_client(dev, cl); + } + mei_cl_flush_queues(cl); + dev_dbg(&dev->pdev->dev, "remove client host client = %d, ME client = %d\n", + cl->host_client_id, + cl->me_client_id); + + if (dev->open_handle_count > 0) { + clear_bit(cl->host_client_id, dev->host_clients_map); + dev->open_handle_count--; + } + mei_remove_client_from_file_list(dev, cl->host_client_id); + + /* free read cb */ + cb = NULL; + if (cl->read_cb) { + cb = find_read_list_entry(dev, cl); + /* Remove entry from read list */ + if (cb) + list_del(&cb->cb_list); + + cb = cl->read_cb; + cl->read_cb = NULL; + } + + file->private_data = NULL; + + if (cb) { + mei_free_cb_private(cb); + cb = NULL; + } + + kfree(cl); + } else { + if (dev->open_handle_count > 0) + dev->open_handle_count--; + + if (dev->iamthif_file_object == file && + dev->iamthif_state != MEI_IAMTHIF_IDLE) { + + dev_dbg(&dev->pdev->dev, "amthi canceled iamthif state %d\n", + dev->iamthif_state); + dev->iamthif_canceled = true; + if (dev->iamthif_state == MEI_IAMTHIF_READ_COMPLETE) { + dev_dbg(&dev->pdev->dev, "run next amthi iamthif cb\n"); + mei_run_next_iamthif_cmd(dev); + } + } + + if (mei_clear_lists(dev, file)) + dev->iamthif_state = MEI_IAMTHIF_IDLE; + + } + mutex_unlock(&dev->device_lock); + return rets; +} + + +/** + * mei_read - the read function. + * + * @file: pointer to file structure + * @ubuf: pointer to user buffer + * @length: buffer length + * @offset: data offset in buffer + * + * returns >=0 data length on success , <0 on error + */ +static ssize_t mei_read(struct file *file, char __user *ubuf, + size_t length, loff_t *offset) +{ + struct mei_cl *cl = file->private_data; + struct mei_cl_cb *cb_pos = NULL; + struct mei_cl_cb *cb = NULL; + struct mei_device *dev; + int i; + int rets; + int err; + + + if (WARN_ON(!cl || !cl->dev)) + return -ENODEV; + + dev = cl->dev; + + mutex_lock(&dev->device_lock); + if (dev->mei_state != MEI_ENABLED) { + rets = -ENODEV; + goto out; + } + + if ((cl->sm_state & MEI_WD_STATE_INDEPENDENCE_MSG_SENT) == 0) { + /* Do not allow to read watchdog client */ + i = mei_find_me_client_index(dev, mei_wd_guid); + if (i >= 0) { + struct mei_me_client *me_client = &dev->me_clients[i]; + + if (cl->me_client_id == me_client->client_id) { + rets = -EBADF; + goto out; + } + } + } else { + cl->sm_state &= ~MEI_WD_STATE_INDEPENDENCE_MSG_SENT; + } + + if (cl == &dev->iamthif_cl) { + rets = amthi_read(dev, file, ubuf, length, offset); + goto out; + } + + if (cl->read_cb && cl->read_cb->information > *offset) { + cb = cl->read_cb; + goto copy_buffer; + } else if (cl->read_cb && cl->read_cb->information > 0 && + cl->read_cb->information <= *offset) { + cb = cl->read_cb; + rets = 0; + goto free; + } else if ((!cl->read_cb || !cl->read_cb->information) && + *offset > 0) { + /*Offset needs to be cleaned for contiguous reads*/ + *offset = 0; + rets = 0; + goto out; + } + + err = mei_start_read(dev, cl); + if (err && err != -EBUSY) { + dev_dbg(&dev->pdev->dev, + "mei start read failure with status = %d\n", err); + rets = err; + goto out; + } + + if (MEI_READ_COMPLETE != cl->reading_state && + !waitqueue_active(&cl->rx_wait)) { + if (file->f_flags & O_NONBLOCK) { + rets = -EAGAIN; + goto out; + } + + mutex_unlock(&dev->device_lock); + + if (wait_event_interruptible(cl->rx_wait, + (MEI_READ_COMPLETE == cl->reading_state || + MEI_FILE_INITIALIZING == cl->state || + MEI_FILE_DISCONNECTED == cl->state || + MEI_FILE_DISCONNECTING == cl->state))) { + if (signal_pending(current)) + return -EINTR; + return -ERESTARTSYS; + } + + mutex_lock(&dev->device_lock); + if (MEI_FILE_INITIALIZING == cl->state || + MEI_FILE_DISCONNECTED == cl->state || + MEI_FILE_DISCONNECTING == cl->state) { + rets = -EBUSY; + goto out; + } + } + + cb = cl->read_cb; + + if (!cb) { + rets = -ENODEV; + goto out; + } + if (cl->reading_state != MEI_READ_COMPLETE) { + rets = 0; + goto out; + } + /* now copy the data to user space */ +copy_buffer: + dev_dbg(&dev->pdev->dev, "cb->response_buffer size - %d\n", + cb->response_buffer.size); + dev_dbg(&dev->pdev->dev, "cb->information - %lu\n", + cb->information); + if (length == 0 || ubuf == NULL || *offset > cb->information) { + rets = -EMSGSIZE; + goto free; + } + + /* length is being truncated to PAGE_SIZE, however, */ + /* information size 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; + goto free; + } + + rets = length; + *offset += length; + if ((unsigned long)*offset < cb->information) + goto out; + +free: + cb_pos = find_read_list_entry(dev, cl); + /* Remove entry from read list */ + if (cb_pos) + list_del(&cb_pos->cb_list); + mei_free_cb_private(cb); + cl->reading_state = MEI_IDLE; + cl->read_cb = NULL; + cl->read_pending = 0; +out: + dev_dbg(&dev->pdev->dev, "end mei read rets= %d\n", rets); + mutex_unlock(&dev->device_lock); + return rets; +} + +/** + * mei_write - the write function. + * + * @file: pointer to file structure + * @ubuf: pointer to user buffer + * @length: buffer length + * @offset: data offset in buffer + * + * returns >=0 data length on success , <0 on error + */ +static ssize_t mei_write(struct file *file, const char __user *ubuf, + size_t length, loff_t *offset) +{ + struct mei_cl *cl = file->private_data; + struct mei_cl_cb *write_cb = NULL; + struct mei_msg_hdr mei_hdr; + struct mei_device *dev; + unsigned long timeout = 0; + int rets; + int i; + + if (WARN_ON(!cl || !cl->dev)) + return -ENODEV; + + dev = cl->dev; + + mutex_lock(&dev->device_lock); + + if (dev->mei_state != MEI_ENABLED) { + mutex_unlock(&dev->device_lock); + return -ENODEV; + } + + if (cl == &dev->iamthif_cl) { + write_cb = find_amthi_read_list_entry(dev, file); + + if (write_cb) { + timeout = write_cb->read_time + + msecs_to_jiffies(IAMTHIF_READ_TIMER); + + if (time_after(jiffies, timeout) || + cl->reading_state == MEI_READ_COMPLETE) { + *offset = 0; + list_del(&write_cb->cb_list); + mei_free_cb_private(write_cb); + write_cb = NULL; + } + } + } + + /* free entry used in read */ + if (cl->reading_state == MEI_READ_COMPLETE) { + *offset = 0; + write_cb = find_read_list_entry(dev, cl); + if (write_cb) { + list_del(&write_cb->cb_list); + mei_free_cb_private(write_cb); + write_cb = NULL; + cl->reading_state = MEI_IDLE; + cl->read_cb = NULL; + cl->read_pending = 0; + } + } else if (cl->reading_state == MEI_IDLE && !cl->read_pending) + *offset = 0; + + + write_cb = kzalloc(sizeof(struct mei_cl_cb), GFP_KERNEL); + if (!write_cb) { + mutex_unlock(&dev->device_lock); + return -ENOMEM; + } + + write_cb->file_object = file; + write_cb->file_private = cl; + write_cb->request_buffer.data = kmalloc(length, GFP_KERNEL); + rets = -ENOMEM; + if (!write_cb->request_buffer.data) + goto unlock_dev; + + dev_dbg(&dev->pdev->dev, "length =%d\n", (int) length); + + rets = -EFAULT; + if (copy_from_user(write_cb->request_buffer.data, ubuf, length)) + goto unlock_dev; + + cl->sm_state = 0; + if (length == 4 && + ((memcmp(mei_wd_state_independence_msg[0], + write_cb->request_buffer.data, 4) == 0) || + (memcmp(mei_wd_state_independence_msg[1], + write_cb->request_buffer.data, 4) == 0) || + (memcmp(mei_wd_state_independence_msg[2], + write_cb->request_buffer.data, 4) == 0))) + cl->sm_state |= MEI_WD_STATE_INDEPENDENCE_MSG_SENT; + + INIT_LIST_HEAD(&write_cb->cb_list); + if (cl == &dev->iamthif_cl) { + write_cb->response_buffer.data = + kmalloc(dev->iamthif_mtu, GFP_KERNEL); + if (!write_cb->response_buffer.data) { + rets = -ENOMEM; + goto unlock_dev; + } + if (dev->mei_state != MEI_ENABLED) { + rets = -ENODEV; + goto unlock_dev; + } + for (i = 0; i < dev->me_clients_num; i++) { + if (dev->me_clients[i].client_id == + dev->iamthif_cl.me_client_id) + break; + } + + if (WARN_ON(dev->me_clients[i].client_id != cl->me_client_id)) { + rets = -ENODEV; + goto unlock_dev; + } + if (i == dev->me_clients_num || + (dev->me_clients[i].client_id != + dev->iamthif_cl.me_client_id)) { + rets = -ENODEV; + goto unlock_dev; + } else if (length > dev->me_clients[i].props.max_msg_length || + length <= 0) { + rets = -EMSGSIZE; + goto unlock_dev; + } + + write_cb->response_buffer.size = dev->iamthif_mtu; + write_cb->major_file_operations = MEI_IOCTL; + write_cb->information = 0; + write_cb->request_buffer.size = length; + if (dev->iamthif_cl.state != MEI_FILE_CONNECTED) { + rets = -ENODEV; + goto unlock_dev; + } + + if (!list_empty(&dev->amthi_cmd_list.mei_cb.cb_list) || + dev->iamthif_state != MEI_IAMTHIF_IDLE) { + dev_dbg(&dev->pdev->dev, "amthi_state = %d\n", + (int) dev->iamthif_state); + dev_dbg(&dev->pdev->dev, "add amthi cb to amthi cmd waiting list\n"); + list_add_tail(&write_cb->cb_list, + &dev->amthi_cmd_list.mei_cb.cb_list); + rets = length; + } else { + dev_dbg(&dev->pdev->dev, "call amthi write\n"); + rets = amthi_write(dev, write_cb); + + if (rets) { + dev_dbg(&dev->pdev->dev, "amthi write failed with status = %d\n", + rets); + goto unlock_dev; + } + rets = length; + } + mutex_unlock(&dev->device_lock); + return rets; + } + + write_cb->major_file_operations = MEI_WRITE; + /* make sure information is zero before we start */ + + write_cb->information = 0; + write_cb->request_buffer.size = length; + + dev_dbg(&dev->pdev->dev, "host client = %d, ME client = %d\n", + cl->host_client_id, cl->me_client_id); + if (cl->state != MEI_FILE_CONNECTED) { + rets = -ENODEV; + dev_dbg(&dev->pdev->dev, "host client = %d, is not connected to ME client = %d", + cl->host_client_id, + cl->me_client_id); + goto unlock_dev; + } + 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_dev; + } + if (i == dev->me_clients_num) { + rets = -ENODEV; + goto unlock_dev; + } + if (length > dev->me_clients[i].props.max_msg_length || length <= 0) { + rets = -EINVAL; + goto unlock_dev; + } + write_cb->file_private = cl; + + rets = mei_flow_ctrl_creds(dev, cl); + if (rets < 0) + goto unlock_dev; + + if (rets && dev->mei_host_buffer_is_empty) { + rets = 0; + dev->mei_host_buffer_is_empty = false; + if (length > ((((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 = length; + mei_hdr.msg_complete = 1; + } + mei_hdr.host_addr = cl->host_client_id; + mei_hdr.me_addr = cl->me_client_id; + mei_hdr.reserved = 0; + dev_dbg(&dev->pdev->dev, "call mei_write_message header=%08x.\n", + *((u32 *) &mei_hdr)); + if (mei_write_message(dev, &mei_hdr, + (unsigned char *) (write_cb->request_buffer.data), + mei_hdr.length)) { + rets = -ENODEV; + goto unlock_dev; + } + cl->writing_state = MEI_WRITING; + write_cb->information = mei_hdr.length; + if (mei_hdr.msg_complete) { + if (mei_flow_ctrl_reduce(dev, cl)) { + rets = -ENODEV; + goto unlock_dev; + } + list_add_tail(&write_cb->cb_list, + &dev->write_waiting_list.mei_cb.cb_list); + } else { + list_add_tail(&write_cb->cb_list, + &dev->write_list.mei_cb.cb_list); + } + + } else { + + write_cb->information = 0; + cl->writing_state = MEI_WRITING; + list_add_tail(&write_cb->cb_list, + &dev->write_list.mei_cb.cb_list); + } + mutex_unlock(&dev->device_lock); + return length; + +unlock_dev: + mutex_unlock(&dev->device_lock); + mei_free_cb_private(write_cb); + return rets; +} + + +/** + * mei_ioctl - the IOCTL function + * + * @file: pointer to file structure + * @cmd: ioctl command + * @data: pointer to mei message structure + * + * returns 0 on success , <0 on error + */ +static long mei_ioctl(struct file *file, unsigned int cmd, unsigned long data) +{ + struct mei_device *dev; + struct mei_cl *cl = file->private_data; + struct mei_connect_client_data *connect_data = NULL; + int rets; + + if (cmd != IOCTL_MEI_CONNECT_CLIENT) + return -EINVAL; + + if (WARN_ON(!cl || !cl->dev)) + return -ENODEV; + + dev = cl->dev; + + dev_dbg(&dev->pdev->dev, "IOCTL cmd = 0x%x", cmd); + + mutex_lock(&dev->device_lock); + if (dev->mei_state != MEI_ENABLED) { + rets = -ENODEV; + goto out; + } + + dev_dbg(&dev->pdev->dev, ": IOCTL_MEI_CONNECT_CLIENT.\n"); + + connect_data = kzalloc(sizeof(struct mei_connect_client_data), + GFP_KERNEL); + if (!connect_data) { + rets = -ENOMEM; + goto out; + } + dev_dbg(&dev->pdev->dev, "copy connect data from user\n"); + if (copy_from_user(connect_data, (char __user *)data, + sizeof(struct mei_connect_client_data))) { + dev_dbg(&dev->pdev->dev, "failed to copy data from userland\n"); + rets = -EFAULT; + goto out; + } + rets = mei_ioctl_connect_client(file, connect_data); + + /* if all is ok, copying the data back to user. */ + if (rets) + goto out; + + dev_dbg(&dev->pdev->dev, "copy connect data to user\n"); + if (copy_to_user((char __user *)data, connect_data, + sizeof(struct mei_connect_client_data))) { + dev_dbg(&dev->pdev->dev, "failed to copy data to userland\n"); + rets = -EFAULT; + goto out; + } + +out: + kfree(connect_data); + mutex_unlock(&dev->device_lock); + return rets; +} + +/** + * mei_compat_ioctl - the compat IOCTL function + * + * @file: pointer to file structure + * @cmd: ioctl command + * @data: pointer to mei message structure + * + * returns 0 on success , <0 on error + */ +#ifdef CONFIG_COMPAT +static long mei_compat_ioctl(struct file *file, + unsigned int cmd, unsigned long data) +{ + return mei_ioctl(file, cmd, (unsigned long)compat_ptr(data)); +} +#endif + + +/** + * mei_poll - the poll function + * + * @file: pointer to file structure + * @wait: pointer to poll_table structure + * + * returns poll mask + */ +static unsigned int mei_poll(struct file *file, poll_table *wait) +{ + struct mei_cl *cl = file->private_data; + struct mei_device *dev; + unsigned int mask = 0; + + if (WARN_ON(!cl || !cl->dev)) + return mask; + + dev = cl->dev; + + mutex_lock(&dev->device_lock); + + if (dev->mei_state != MEI_ENABLED) + goto out; + + + if (cl == &dev->iamthif_cl) { + mutex_unlock(&dev->device_lock); + poll_wait(file, &dev->iamthif_cl.wait, wait); + mutex_lock(&dev->device_lock); + if (dev->iamthif_state == MEI_IAMTHIF_READ_COMPLETE && + dev->iamthif_file_object == file) { + mask |= (POLLIN | POLLRDNORM); + dev_dbg(&dev->pdev->dev, "run next amthi cb\n"); + mei_run_next_iamthif_cmd(dev); + } + goto out; + } + + mutex_unlock(&dev->device_lock); + poll_wait(file, &cl->tx_wait, wait); + mutex_lock(&dev->device_lock); + if (MEI_WRITE_COMPLETE == cl->writing_state) + mask |= (POLLIN | POLLRDNORM); + +out: + mutex_unlock(&dev->device_lock); + return mask; +} + +/* + * file operations structure will be used for mei char device. + */ +static const struct file_operations mei_fops = { + .owner = THIS_MODULE, + .read = mei_read, + .unlocked_ioctl = mei_ioctl, +#ifdef CONFIG_COMPAT + .compat_ioctl = mei_compat_ioctl, +#endif + .open = mei_open, + .release = mei_release, + .write = mei_write, + .poll = mei_poll, + .llseek = no_llseek +}; + + +/* + * Misc Device Struct + */ +static struct miscdevice mei_misc_device = { + .name = "mei", + .fops = &mei_fops, + .minor = MISC_DYNAMIC_MINOR, +}; + +/** + * mei_probe - Device Initialization Routine + * + * @pdev: PCI device structure + * @ent: entry in kcs_pci_tbl + * + * returns 0 on success, <0 on failure. + */ +static int __devinit mei_probe(struct pci_dev *pdev, + const struct pci_device_id *ent) +{ + struct mei_device *dev; + int err; + + mutex_lock(&mei_mutex); + if (mei_device) { + err = -EEXIST; + goto end; + } + /* enable pci dev */ + err = pci_enable_device(pdev); + if (err) { + dev_err(&pdev->dev, "failed to enable pci device.\n"); + goto end; + } + /* set PCI host mastering */ + pci_set_master(pdev); + /* pci request regions for mei driver */ + err = pci_request_regions(pdev, mei_driver_name); + if (err) { + dev_err(&pdev->dev, "failed to get pci regions.\n"); + goto disable_device; + } + /* allocates and initializes the mei dev structure */ + dev = mei_device_init(pdev); + if (!dev) { + err = -ENOMEM; + goto release_regions; + } + /* mapping IO device memory */ + dev->mem_addr = pci_iomap(pdev, 0, 0); + if (!dev->mem_addr) { + dev_err(&pdev->dev, "mapping I/O device memory failure.\n"); + err = -ENOMEM; + goto free_device; + } + pci_enable_msi(pdev); + + /* request and enable interrupt */ + if (pci_dev_msi_enabled(pdev)) + err = request_threaded_irq(pdev->irq, + NULL, + mei_interrupt_thread_handler, + 0, mei_driver_name, dev); + else + err = request_threaded_irq(pdev->irq, + mei_interrupt_quick_handler, + mei_interrupt_thread_handler, + IRQF_SHARED, mei_driver_name, dev); + + if (err) { + dev_err(&pdev->dev, "request_threaded_irq failure. irq = %d\n", + pdev->irq); + goto unmap_memory; + } + INIT_DELAYED_WORK(&dev->timer_work, mei_timer); + if (mei_hw_init(dev)) { + dev_err(&pdev->dev, "init hw failure.\n"); + err = -ENODEV; + goto release_irq; + } + + err = misc_register(&mei_misc_device); + if (err) + goto release_irq; + + mei_device = pdev; + pci_set_drvdata(pdev, dev); + + + schedule_delayed_work(&dev->timer_work, HZ); + + mutex_unlock(&mei_mutex); + + pr_debug("initialization successful.\n"); + + return 0; + +release_irq: + /* disable interrupts */ + dev->host_hw_state = mei_hcsr_read(dev); + mei_disable_interrupts(dev); + flush_scheduled_work(); + free_irq(pdev->irq, dev); + pci_disable_msi(pdev); +unmap_memory: + pci_iounmap(pdev, dev->mem_addr); +free_device: + kfree(dev); +release_regions: + pci_release_regions(pdev); +disable_device: + pci_disable_device(pdev); +end: + mutex_unlock(&mei_mutex); + dev_err(&pdev->dev, "initialization failed.\n"); + return err; +} + +/** + * mei_remove - Device Removal Routine + * + * @pdev: PCI device structure + * + * mei_remove is called by the PCI subsystem to alert the driver + * that it should release a PCI device. + */ +static void __devexit mei_remove(struct pci_dev *pdev) +{ + struct mei_device *dev; + + if (mei_device != pdev) + return; + + dev = pci_get_drvdata(pdev); + if (!dev) + return; + + mutex_lock(&dev->device_lock); + + mei_wd_stop(dev, false); + + mei_device = NULL; + + if (dev->iamthif_cl.state == MEI_FILE_CONNECTED) { + dev->iamthif_cl.state = MEI_FILE_DISCONNECTING; + mei_disconnect_host_client(dev, &dev->iamthif_cl); + } + if (dev->wd_cl.state == MEI_FILE_CONNECTED) { + dev->wd_cl.state = MEI_FILE_DISCONNECTING; + mei_disconnect_host_client(dev, &dev->wd_cl); + } + + /* Unregistering watchdog device */ + mei_watchdog_unregister(dev); + + /* remove entry if already in list */ + dev_dbg(&pdev->dev, "list del iamthif and wd file list.\n"); + mei_remove_client_from_file_list(dev, dev->wd_cl.host_client_id); + mei_remove_client_from_file_list(dev, dev->iamthif_cl.host_client_id); + + dev->iamthif_current_cb = NULL; + dev->me_clients_num = 0; + + mutex_unlock(&dev->device_lock); + + flush_scheduled_work(); + + /* disable interrupts */ + mei_disable_interrupts(dev); + + free_irq(pdev->irq, dev); + pci_disable_msi(pdev); + pci_set_drvdata(pdev, NULL); + + if (dev->mem_addr) + pci_iounmap(pdev, dev->mem_addr); + + kfree(dev); + + pci_release_regions(pdev); + pci_disable_device(pdev); +} +#ifdef CONFIG_PM +static int mei_pci_suspend(struct device *device) +{ + struct pci_dev *pdev = to_pci_dev(device); + struct mei_device *dev = pci_get_drvdata(pdev); + int err; + + if (!dev) + return -ENODEV; + mutex_lock(&dev->device_lock); + /* Stop watchdog if exists */ + err = mei_wd_stop(dev, true); + /* Set new mei state */ + if (dev->mei_state == MEI_ENABLED || + dev->mei_state == MEI_RECOVERING_FROM_RESET) { + dev->mei_state = MEI_POWER_DOWN; + mei_reset(dev, 0); + } + mutex_unlock(&dev->device_lock); + + free_irq(pdev->irq, dev); + pci_disable_msi(pdev); + + return err; +} + +static int mei_pci_resume(struct device *device) +{ + struct pci_dev *pdev = to_pci_dev(device); + struct mei_device *dev; + int err; + + dev = pci_get_drvdata(pdev); + if (!dev) + return -ENODEV; + + pci_enable_msi(pdev); + + /* request and enable interrupt */ + if (pci_dev_msi_enabled(pdev)) + err = request_threaded_irq(pdev->irq, + NULL, + mei_interrupt_thread_handler, + 0, mei_driver_name, dev); + else + err = request_threaded_irq(pdev->irq, + mei_interrupt_quick_handler, + mei_interrupt_thread_handler, + IRQF_SHARED, mei_driver_name, dev); + + if (err) { + dev_err(&pdev->dev, "request_threaded_irq failed: irq = %d.\n", + pdev->irq); + return err; + } + + mutex_lock(&dev->device_lock); + dev->mei_state = MEI_POWER_UP; + mei_reset(dev, 1); + mutex_unlock(&dev->device_lock); + + /* Start timer if stopped in suspend */ + schedule_delayed_work(&dev->timer_work, HZ); + + return err; +} +static SIMPLE_DEV_PM_OPS(mei_pm_ops, mei_pci_suspend, mei_pci_resume); +#define MEI_PM_OPS (&mei_pm_ops) +#else +#define MEI_PM_OPS NULL +#endif /* CONFIG_PM */ +/* + * PCI driver structure + */ +static struct pci_driver mei_driver = { + .name = mei_driver_name, + .id_table = mei_pci_tbl, + .probe = mei_probe, + .remove = __devexit_p(mei_remove), + .shutdown = __devexit_p(mei_remove), + .driver.pm = MEI_PM_OPS, +}; + +/** + * mei_init_module - Driver Registration Routine + * + * mei_init_module is the first routine called when the driver is + * loaded. All it does is to register with the PCI subsystem. + * + * returns 0 on success, <0 on failure. + */ +static int __init mei_init_module(void) +{ + int ret; + + pr_debug("loading.\n"); + /* init pci module */ + ret = pci_register_driver(&mei_driver); + if (ret < 0) + pr_err("error registering driver.\n"); + + return ret; +} + +module_init(mei_init_module); + +/** + * mei_exit_module - Driver Exit Cleanup Routine + * + * mei_exit_module is called just before the driver is removed + * from memory. + */ +static void __exit mei_exit_module(void) +{ + misc_deregister(&mei_misc_device); + pci_unregister_driver(&mei_driver); + + pr_debug("unloaded successfully.\n"); +} + +module_exit(mei_exit_module); + + +MODULE_AUTHOR("Intel Corporation"); +MODULE_DESCRIPTION("Intel(R) Management Engine Interface"); +MODULE_LICENSE("GPL v2"); |
