Oren Weil | ab84116 | 2011-05-15 13:43:41 +0300 | [diff] [blame] | 1 | /* |
| 2 | * |
| 3 | * Intel Management Engine Interface (Intel MEI) Linux driver |
Tomas Winkler | 733ba91c | 2012-02-09 19:25:53 +0200 | [diff] [blame] | 4 | * Copyright (c) 2003-2012, Intel Corporation. |
Oren Weil | ab84116 | 2011-05-15 13:43:41 +0300 | [diff] [blame] | 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify it |
| 7 | * under the terms and conditions of the GNU General Public License, |
| 8 | * version 2, as published by the Free Software Foundation. |
| 9 | * |
| 10 | * This program is distributed in the hope it will be useful, but WITHOUT |
| 11 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 12 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
| 13 | * more details. |
| 14 | * |
| 15 | */ |
Oren Weil | ab84116 | 2011-05-15 13:43:41 +0300 | [diff] [blame] | 16 | #include <linux/module.h> |
| 17 | #include <linux/moduleparam.h> |
| 18 | #include <linux/kernel.h> |
| 19 | #include <linux/device.h> |
Tomas Winkler | 1f18035 | 2014-09-29 16:31:46 +0300 | [diff] [blame] | 20 | #include <linux/slab.h> |
Oren Weil | ab84116 | 2011-05-15 13:43:41 +0300 | [diff] [blame] | 21 | #include <linux/fs.h> |
| 22 | #include <linux/errno.h> |
| 23 | #include <linux/types.h> |
| 24 | #include <linux/fcntl.h> |
Oren Weil | ab84116 | 2011-05-15 13:43:41 +0300 | [diff] [blame] | 25 | #include <linux/poll.h> |
| 26 | #include <linux/init.h> |
| 27 | #include <linux/ioctl.h> |
| 28 | #include <linux/cdev.h> |
Oren Weil | ab84116 | 2011-05-15 13:43:41 +0300 | [diff] [blame] | 29 | #include <linux/sched.h> |
| 30 | #include <linux/uuid.h> |
| 31 | #include <linux/compat.h> |
| 32 | #include <linux/jiffies.h> |
| 33 | #include <linux/interrupt.h> |
| 34 | |
Tomas Winkler | 4f3afe1 | 2012-05-09 16:38:59 +0300 | [diff] [blame] | 35 | #include <linux/mei.h> |
Tomas Winkler | 47a7380 | 2012-12-25 19:06:03 +0200 | [diff] [blame] | 36 | |
| 37 | #include "mei_dev.h" |
Tomas Winkler | 90e0b5f | 2013-01-08 23:07:14 +0200 | [diff] [blame] | 38 | #include "client.h" |
Oren Weil | ab84116 | 2011-05-15 13:43:41 +0300 | [diff] [blame] | 39 | |
Oren Weil | ab84116 | 2011-05-15 13:43:41 +0300 | [diff] [blame] | 40 | /** |
Oren Weil | ab84116 | 2011-05-15 13:43:41 +0300 | [diff] [blame] | 41 | * mei_open - the open function |
| 42 | * |
| 43 | * @inode: pointer to inode structure |
| 44 | * @file: pointer to file structure |
Alexander Usyskin | 83ce074 | 2014-01-08 22:31:46 +0200 | [diff] [blame] | 45 | * |
Alexander Usyskin | a8605ea | 2014-09-29 16:31:49 +0300 | [diff] [blame] | 46 | * Return: 0 on success, <0 on error |
Oren Weil | ab84116 | 2011-05-15 13:43:41 +0300 | [diff] [blame] | 47 | */ |
| 48 | static int mei_open(struct inode *inode, struct file *file) |
| 49 | { |
Oren Weil | ab84116 | 2011-05-15 13:43:41 +0300 | [diff] [blame] | 50 | struct mei_device *dev; |
Alexander Usyskin | f3d8e87 | 2014-06-23 15:10:35 +0300 | [diff] [blame] | 51 | struct mei_cl *cl; |
Tomas Winkler | 2703d4b | 2013-02-06 14:06:39 +0200 | [diff] [blame] | 52 | |
Tomas Winkler | 6f37aca | 2011-11-13 09:41:15 +0200 | [diff] [blame] | 53 | int err; |
Oren Weil | ab84116 | 2011-05-15 13:43:41 +0300 | [diff] [blame] | 54 | |
Alexander Usyskin | f3d8e87 | 2014-06-23 15:10:35 +0300 | [diff] [blame] | 55 | dev = container_of(inode->i_cdev, struct mei_device, cdev); |
Oren Weil | 5b881e3 | 2011-11-13 09:41:14 +0200 | [diff] [blame] | 56 | if (!dev) |
Tomas Winkler | e036cc5 | 2013-09-16 23:44:46 +0300 | [diff] [blame] | 57 | return -ENODEV; |
Oren Weil | ab84116 | 2011-05-15 13:43:41 +0300 | [diff] [blame] | 58 | |
| 59 | mutex_lock(&dev->device_lock); |
Tomas Winkler | e036cc5 | 2013-09-16 23:44:46 +0300 | [diff] [blame] | 60 | |
Tomas Winkler | b210d75 | 2012-08-07 00:03:56 +0300 | [diff] [blame] | 61 | if (dev->dev_state != MEI_DEV_ENABLED) { |
Tomas Winkler | 2bf94cab | 2014-09-29 16:31:42 +0300 | [diff] [blame] | 62 | dev_dbg(dev->dev, "dev_state != MEI_ENABLED dev_state = %s\n", |
Tomas Winkler | b210d75 | 2012-08-07 00:03:56 +0300 | [diff] [blame] | 63 | mei_dev_state_str(dev->dev_state)); |
Tomas Winkler | 03b8d34 | 2015-02-10 10:39:44 +0200 | [diff] [blame] | 64 | err = -ENODEV; |
Tomas Winkler | e036cc5 | 2013-09-16 23:44:46 +0300 | [diff] [blame] | 65 | goto err_unlock; |
Tomas Winkler | 1b81294 | 2012-09-11 00:43:20 +0300 | [diff] [blame] | 66 | } |
Oren Weil | ab84116 | 2011-05-15 13:43:41 +0300 | [diff] [blame] | 67 | |
Alexander Usyskin | 7851e00 | 2016-02-07 23:35:40 +0200 | [diff] [blame] | 68 | cl = mei_cl_alloc_linked(dev); |
Tomas Winkler | 03b8d34 | 2015-02-10 10:39:44 +0200 | [diff] [blame] | 69 | if (IS_ERR(cl)) { |
| 70 | err = PTR_ERR(cl); |
Tomas Winkler | e036cc5 | 2013-09-16 23:44:46 +0300 | [diff] [blame] | 71 | goto err_unlock; |
Tomas Winkler | 03b8d34 | 2015-02-10 10:39:44 +0200 | [diff] [blame] | 72 | } |
Oren Weil | ab84116 | 2011-05-15 13:43:41 +0300 | [diff] [blame] | 73 | |
Alexander Usyskin | 97d549b | 2016-06-16 17:58:57 +0300 | [diff] [blame] | 74 | cl->fp = file; |
Oren Weil | ab84116 | 2011-05-15 13:43:41 +0300 | [diff] [blame] | 75 | file->private_data = cl; |
Tomas Winkler | e036cc5 | 2013-09-16 23:44:46 +0300 | [diff] [blame] | 76 | |
Oren Weil | ab84116 | 2011-05-15 13:43:41 +0300 | [diff] [blame] | 77 | mutex_unlock(&dev->device_lock); |
| 78 | |
Oren Weil | 5b881e3 | 2011-11-13 09:41:14 +0200 | [diff] [blame] | 79 | return nonseekable_open(inode, file); |
Oren Weil | ab84116 | 2011-05-15 13:43:41 +0300 | [diff] [blame] | 80 | |
Tomas Winkler | e036cc5 | 2013-09-16 23:44:46 +0300 | [diff] [blame] | 81 | err_unlock: |
Oren Weil | ab84116 | 2011-05-15 13:43:41 +0300 | [diff] [blame] | 82 | mutex_unlock(&dev->device_lock); |
Oren Weil | ab84116 | 2011-05-15 13:43:41 +0300 | [diff] [blame] | 83 | return err; |
| 84 | } |
| 85 | |
| 86 | /** |
| 87 | * mei_release - the release function |
| 88 | * |
| 89 | * @inode: pointer to inode structure |
| 90 | * @file: pointer to file structure |
| 91 | * |
Alexander Usyskin | a8605ea | 2014-09-29 16:31:49 +0300 | [diff] [blame] | 92 | * Return: 0 on success, <0 on error |
Oren Weil | ab84116 | 2011-05-15 13:43:41 +0300 | [diff] [blame] | 93 | */ |
| 94 | static int mei_release(struct inode *inode, struct file *file) |
| 95 | { |
| 96 | struct mei_cl *cl = file->private_data; |
Oren Weil | ab84116 | 2011-05-15 13:43:41 +0300 | [diff] [blame] | 97 | struct mei_device *dev; |
Tomas Winkler | 3c66618 | 2015-05-04 09:43:52 +0300 | [diff] [blame] | 98 | int rets; |
Oren Weil | ab84116 | 2011-05-15 13:43:41 +0300 | [diff] [blame] | 99 | |
| 100 | if (WARN_ON(!cl || !cl->dev)) |
| 101 | return -ENODEV; |
| 102 | |
| 103 | dev = cl->dev; |
| 104 | |
| 105 | mutex_lock(&dev->device_lock); |
Tomas Winkler | a562d5c | 2012-11-11 17:38:01 +0200 | [diff] [blame] | 106 | if (cl == &dev->iamthif_cl) { |
| 107 | rets = mei_amthif_release(dev, file); |
| 108 | goto out; |
| 109 | } |
Tomas Winkler | 3c66618 | 2015-05-04 09:43:52 +0300 | [diff] [blame] | 110 | rets = mei_cl_disconnect(cl); |
| 111 | |
Tomas Winkler | a9bed61 | 2015-02-10 10:39:46 +0200 | [diff] [blame] | 112 | mei_cl_flush_queues(cl, file); |
Tomas Winkler | 4692218 | 2014-03-16 14:35:55 +0200 | [diff] [blame] | 113 | cl_dbg(dev, cl, "removing\n"); |
Tomas Winkler | a562d5c | 2012-11-11 17:38:01 +0200 | [diff] [blame] | 114 | |
Tomas Winkler | 90e0b5f | 2013-01-08 23:07:14 +0200 | [diff] [blame] | 115 | mei_cl_unlink(cl); |
Tomas Winkler | a562d5c | 2012-11-11 17:38:01 +0200 | [diff] [blame] | 116 | |
Tomas Winkler | a562d5c | 2012-11-11 17:38:01 +0200 | [diff] [blame] | 117 | file->private_data = NULL; |
| 118 | |
Tomas Winkler | a562d5c | 2012-11-11 17:38:01 +0200 | [diff] [blame] | 119 | kfree(cl); |
| 120 | out: |
Oren Weil | ab84116 | 2011-05-15 13:43:41 +0300 | [diff] [blame] | 121 | mutex_unlock(&dev->device_lock); |
| 122 | return rets; |
| 123 | } |
| 124 | |
| 125 | |
| 126 | /** |
| 127 | * mei_read - the read function. |
| 128 | * |
| 129 | * @file: pointer to file structure |
| 130 | * @ubuf: pointer to user buffer |
| 131 | * @length: buffer length |
| 132 | * @offset: data offset in buffer |
| 133 | * |
Alexander Usyskin | a8605ea | 2014-09-29 16:31:49 +0300 | [diff] [blame] | 134 | * Return: >=0 data length on success , <0 on error |
Oren Weil | ab84116 | 2011-05-15 13:43:41 +0300 | [diff] [blame] | 135 | */ |
| 136 | static ssize_t mei_read(struct file *file, char __user *ubuf, |
Tomas Winkler | 441ab50 | 2011-12-13 23:39:34 +0200 | [diff] [blame] | 137 | size_t length, loff_t *offset) |
Oren Weil | ab84116 | 2011-05-15 13:43:41 +0300 | [diff] [blame] | 138 | { |
| 139 | struct mei_cl *cl = file->private_data; |
Oren Weil | ab84116 | 2011-05-15 13:43:41 +0300 | [diff] [blame] | 140 | struct mei_device *dev; |
Tomas Winkler | a9bed61 | 2015-02-10 10:39:46 +0200 | [diff] [blame] | 141 | struct mei_cl_cb *cb = NULL; |
Alexander Usyskin | ff1586a | 2016-07-26 01:06:06 +0300 | [diff] [blame] | 142 | bool nonblock = !!(file->f_flags & O_NONBLOCK); |
Oren Weil | ab84116 | 2011-05-15 13:43:41 +0300 | [diff] [blame] | 143 | int rets; |
Oren Weil | ab84116 | 2011-05-15 13:43:41 +0300 | [diff] [blame] | 144 | |
| 145 | if (WARN_ON(!cl || !cl->dev)) |
| 146 | return -ENODEV; |
| 147 | |
| 148 | dev = cl->dev; |
| 149 | |
Tomas Winkler | dd5de1f | 2013-09-02 03:11:04 +0300 | [diff] [blame] | 150 | |
Oren Weil | ab84116 | 2011-05-15 13:43:41 +0300 | [diff] [blame] | 151 | mutex_lock(&dev->device_lock); |
Tomas Winkler | b210d75 | 2012-08-07 00:03:56 +0300 | [diff] [blame] | 152 | if (dev->dev_state != MEI_DEV_ENABLED) { |
Oren Weil | ab84116 | 2011-05-15 13:43:41 +0300 | [diff] [blame] | 153 | rets = -ENODEV; |
| 154 | goto out; |
| 155 | } |
| 156 | |
Tomas Winkler | dd5de1f | 2013-09-02 03:11:04 +0300 | [diff] [blame] | 157 | if (length == 0) { |
| 158 | rets = 0; |
| 159 | goto out; |
| 160 | } |
| 161 | |
Alexander Usyskin | 8b2458f | 2016-01-07 14:46:37 +0200 | [diff] [blame] | 162 | if (ubuf == NULL) { |
| 163 | rets = -EMSGSIZE; |
| 164 | goto out; |
| 165 | } |
| 166 | |
Tomas Winkler | a9bed61 | 2015-02-10 10:39:46 +0200 | [diff] [blame] | 167 | cb = mei_cl_read_cb(cl, file); |
Alexander Usyskin | 8b2458f | 2016-01-07 14:46:37 +0200 | [diff] [blame] | 168 | if (cb) |
| 169 | goto copy_buffer; |
| 170 | |
| 171 | if (*offset > 0) |
Oren Weil | ab84116 | 2011-05-15 13:43:41 +0300 | [diff] [blame] | 172 | *offset = 0; |
Oren Weil | ab84116 | 2011-05-15 13:43:41 +0300 | [diff] [blame] | 173 | |
Alexander Usyskin | ff1586a | 2016-07-26 01:06:06 +0300 | [diff] [blame] | 174 | rets = mei_cl_read_start(cl, length, file); |
| 175 | if (rets && rets != -EBUSY) { |
| 176 | cl_dbg(dev, cl, "mei start read failure status = %d\n", rets); |
Oren Weil | ab84116 | 2011-05-15 13:43:41 +0300 | [diff] [blame] | 177 | goto out; |
| 178 | } |
| 179 | |
Alexander Usyskin | ff1586a | 2016-07-26 01:06:06 +0300 | [diff] [blame] | 180 | if (nonblock) { |
| 181 | rets = -EAGAIN; |
| 182 | goto out; |
| 183 | } |
Oren Weil | ab84116 | 2011-05-15 13:43:41 +0300 | [diff] [blame] | 184 | |
Alexander Usyskin | ff1586a | 2016-07-26 01:06:06 +0300 | [diff] [blame] | 185 | if (rets == -EBUSY && |
| 186 | !mei_cl_enqueue_ctrl_wr_cb(cl, length, MEI_FOP_READ, file)) { |
| 187 | rets = -ENOMEM; |
| 188 | goto out; |
| 189 | } |
| 190 | |
| 191 | do { |
Oren Weil | ab84116 | 2011-05-15 13:43:41 +0300 | [diff] [blame] | 192 | mutex_unlock(&dev->device_lock); |
| 193 | |
| 194 | if (wait_event_interruptible(cl->rx_wait, |
Alexander Usyskin | ff1586a | 2016-07-26 01:06:06 +0300 | [diff] [blame] | 195 | (!list_empty(&cl->rd_completed)) || |
| 196 | (!mei_cl_is_connected(cl)))) { |
Tomas Winkler | e2b3164 | 2013-09-02 13:29:46 +0300 | [diff] [blame] | 197 | |
Oren Weil | ab84116 | 2011-05-15 13:43:41 +0300 | [diff] [blame] | 198 | if (signal_pending(current)) |
| 199 | return -EINTR; |
| 200 | return -ERESTARTSYS; |
| 201 | } |
| 202 | |
| 203 | mutex_lock(&dev->device_lock); |
Tomas Winkler | 6a84d63 | 2015-03-27 00:27:59 +0200 | [diff] [blame] | 204 | if (!mei_cl_is_connected(cl)) { |
Tomas Winkler | 2d4d548 | 2016-06-23 00:25:31 +0300 | [diff] [blame] | 205 | rets = -ENODEV; |
Oren Weil | ab84116 | 2011-05-15 13:43:41 +0300 | [diff] [blame] | 206 | goto out; |
| 207 | } |
Oren Weil | ab84116 | 2011-05-15 13:43:41 +0300 | [diff] [blame] | 208 | |
Alexander Usyskin | ff1586a | 2016-07-26 01:06:06 +0300 | [diff] [blame] | 209 | cb = mei_cl_read_cb(cl, file); |
| 210 | } while (!cb); |
Tomas Winkler | 3d33ff2 | 2015-02-10 10:39:36 +0200 | [diff] [blame] | 211 | |
Oren Weil | ab84116 | 2011-05-15 13:43:41 +0300 | [diff] [blame] | 212 | copy_buffer: |
Tomas Winkler | 3d33ff2 | 2015-02-10 10:39:36 +0200 | [diff] [blame] | 213 | /* now copy the data to user space */ |
| 214 | if (cb->status) { |
| 215 | rets = cb->status; |
Alexander Usyskin | 292f82c | 2015-05-04 09:44:00 +0300 | [diff] [blame] | 216 | cl_dbg(dev, cl, "read operation failed %d\n", rets); |
Tomas Winkler | 3d33ff2 | 2015-02-10 10:39:36 +0200 | [diff] [blame] | 217 | goto free; |
| 218 | } |
| 219 | |
Alexander Usyskin | 35bf769 | 2016-02-17 18:27:34 +0200 | [diff] [blame] | 220 | cl_dbg(dev, cl, "buf.size = %zu buf.idx = %zu offset = %lld\n", |
Alexander Usyskin | 8b2458f | 2016-01-07 14:46:37 +0200 | [diff] [blame] | 221 | cb->buf.size, cb->buf_idx, *offset); |
| 222 | if (*offset >= cb->buf_idx) { |
| 223 | rets = 0; |
Oren Weil | ab84116 | 2011-05-15 13:43:41 +0300 | [diff] [blame] | 224 | goto free; |
| 225 | } |
| 226 | |
Tomas Winkler | ebb108ef | 2012-10-09 16:50:16 +0200 | [diff] [blame] | 227 | /* length is being truncated to PAGE_SIZE, |
| 228 | * however buf_idx may point beyond that */ |
| 229 | length = min_t(size_t, length, cb->buf_idx - *offset); |
Oren Weil | ab84116 | 2011-05-15 13:43:41 +0300 | [diff] [blame] | 230 | |
Tomas Winkler | 5db7514 | 2015-02-10 10:39:42 +0200 | [diff] [blame] | 231 | if (copy_to_user(ubuf, cb->buf.data + *offset, length)) { |
Tomas Winkler | 2bf94cab | 2014-09-29 16:31:42 +0300 | [diff] [blame] | 232 | dev_dbg(dev->dev, "failed to copy data to userland\n"); |
Oren Weil | ab84116 | 2011-05-15 13:43:41 +0300 | [diff] [blame] | 233 | rets = -EFAULT; |
| 234 | goto free; |
| 235 | } |
| 236 | |
| 237 | rets = length; |
| 238 | *offset += length; |
Tomas Winkler | f862b6b | 2016-02-07 23:35:19 +0200 | [diff] [blame] | 239 | /* not all data was read, keep the cb */ |
| 240 | if (*offset < cb->buf_idx) |
Oren Weil | ab84116 | 2011-05-15 13:43:41 +0300 | [diff] [blame] | 241 | goto out; |
| 242 | |
| 243 | free: |
Tomas Winkler | 601a1ef | 2012-10-09 16:50:20 +0200 | [diff] [blame] | 244 | mei_io_cb_free(cb); |
Alexander Usyskin | 8b2458f | 2016-01-07 14:46:37 +0200 | [diff] [blame] | 245 | *offset = 0; |
Tomas Winkler | 928fa66 | 2015-02-10 10:39:45 +0200 | [diff] [blame] | 246 | |
Oren Weil | ab84116 | 2011-05-15 13:43:41 +0300 | [diff] [blame] | 247 | out: |
Alexander Usyskin | 292f82c | 2015-05-04 09:44:00 +0300 | [diff] [blame] | 248 | cl_dbg(dev, cl, "end mei read rets = %d\n", rets); |
Oren Weil | ab84116 | 2011-05-15 13:43:41 +0300 | [diff] [blame] | 249 | mutex_unlock(&dev->device_lock); |
| 250 | return rets; |
| 251 | } |
Tomas Winkler | 33d28c9 | 2012-10-09 16:50:17 +0200 | [diff] [blame] | 252 | /** |
Oren Weil | ab84116 | 2011-05-15 13:43:41 +0300 | [diff] [blame] | 253 | * mei_write - the write function. |
| 254 | * |
| 255 | * @file: pointer to file structure |
| 256 | * @ubuf: pointer to user buffer |
| 257 | * @length: buffer length |
| 258 | * @offset: data offset in buffer |
| 259 | * |
Alexander Usyskin | a8605ea | 2014-09-29 16:31:49 +0300 | [diff] [blame] | 260 | * Return: >=0 data length on success , <0 on error |
Oren Weil | ab84116 | 2011-05-15 13:43:41 +0300 | [diff] [blame] | 261 | */ |
| 262 | static ssize_t mei_write(struct file *file, const char __user *ubuf, |
Tomas Winkler | 441ab50 | 2011-12-13 23:39:34 +0200 | [diff] [blame] | 263 | size_t length, loff_t *offset) |
Oren Weil | ab84116 | 2011-05-15 13:43:41 +0300 | [diff] [blame] | 264 | { |
| 265 | struct mei_cl *cl = file->private_data; |
Alexander Usyskin | 6cbb097 | 2016-02-10 23:57:26 +0200 | [diff] [blame] | 266 | struct mei_cl_cb *cb; |
Oren Weil | ab84116 | 2011-05-15 13:43:41 +0300 | [diff] [blame] | 267 | struct mei_device *dev; |
Oren Weil | ab84116 | 2011-05-15 13:43:41 +0300 | [diff] [blame] | 268 | int rets; |
Oren Weil | ab84116 | 2011-05-15 13:43:41 +0300 | [diff] [blame] | 269 | |
| 270 | if (WARN_ON(!cl || !cl->dev)) |
| 271 | return -ENODEV; |
| 272 | |
| 273 | dev = cl->dev; |
| 274 | |
| 275 | mutex_lock(&dev->device_lock); |
| 276 | |
Tomas Winkler | b210d75 | 2012-08-07 00:03:56 +0300 | [diff] [blame] | 277 | if (dev->dev_state != MEI_DEV_ENABLED) { |
Tomas Winkler | 75f0ee1 | 2012-10-09 16:50:18 +0200 | [diff] [blame] | 278 | rets = -ENODEV; |
Tomas Winkler | 4234a6d | 2013-04-08 21:56:37 +0300 | [diff] [blame] | 279 | goto out; |
Oren Weil | ab84116 | 2011-05-15 13:43:41 +0300 | [diff] [blame] | 280 | } |
| 281 | |
Alexander Usyskin | d49ed64 | 2015-05-04 09:43:54 +0300 | [diff] [blame] | 282 | if (!mei_cl_is_connected(cl)) { |
| 283 | cl_err(dev, cl, "is not connected"); |
| 284 | rets = -ENODEV; |
| 285 | goto out; |
| 286 | } |
| 287 | |
| 288 | if (!mei_me_cl_is_active(cl->me_cl)) { |
Alexander Usyskin | 7ca96aa | 2014-02-19 17:35:49 +0200 | [diff] [blame] | 289 | rets = -ENOTTY; |
Tomas Winkler | 4234a6d | 2013-04-08 21:56:37 +0300 | [diff] [blame] | 290 | goto out; |
Tomas Winkler | 75f0ee1 | 2012-10-09 16:50:18 +0200 | [diff] [blame] | 291 | } |
Tomas Winkler | dd5de1f | 2013-09-02 03:11:04 +0300 | [diff] [blame] | 292 | |
Alexander Usyskin | d49ed64 | 2015-05-04 09:43:54 +0300 | [diff] [blame] | 293 | if (length > mei_cl_mtu(cl)) { |
| 294 | rets = -EFBIG; |
| 295 | goto out; |
| 296 | } |
| 297 | |
Tomas Winkler | dd5de1f | 2013-09-02 03:11:04 +0300 | [diff] [blame] | 298 | if (length == 0) { |
| 299 | rets = 0; |
| 300 | goto out; |
| 301 | } |
| 302 | |
Tomas Winkler | a9bed61 | 2015-02-10 10:39:46 +0200 | [diff] [blame] | 303 | *offset = 0; |
Alexander Usyskin | 6cbb097 | 2016-02-10 23:57:26 +0200 | [diff] [blame] | 304 | cb = mei_cl_alloc_cb(cl, length, MEI_FOP_WRITE, file); |
| 305 | if (!cb) { |
Tomas Winkler | 33d28c9 | 2012-10-09 16:50:17 +0200 | [diff] [blame] | 306 | rets = -ENOMEM; |
Tomas Winkler | 4234a6d | 2013-04-08 21:56:37 +0300 | [diff] [blame] | 307 | goto out; |
Oren Weil | ab84116 | 2011-05-15 13:43:41 +0300 | [diff] [blame] | 308 | } |
Oren Weil | ab84116 | 2011-05-15 13:43:41 +0300 | [diff] [blame] | 309 | |
Alexander Usyskin | 6cbb097 | 2016-02-10 23:57:26 +0200 | [diff] [blame] | 310 | rets = copy_from_user(cb->buf.data, ubuf, length); |
Alexander Usyskin | d8b29ef | 2013-09-02 03:11:02 +0300 | [diff] [blame] | 311 | if (rets) { |
Tomas Winkler | 2bf94cab | 2014-09-29 16:31:42 +0300 | [diff] [blame] | 312 | dev_dbg(dev->dev, "failed to copy data from userland\n"); |
Alexander Usyskin | d8b29ef | 2013-09-02 03:11:02 +0300 | [diff] [blame] | 313 | rets = -EFAULT; |
Alexander Usyskin | 6cbb097 | 2016-02-10 23:57:26 +0200 | [diff] [blame] | 314 | mei_io_cb_free(cb); |
Tomas Winkler | 4234a6d | 2013-04-08 21:56:37 +0300 | [diff] [blame] | 315 | goto out; |
Alexander Usyskin | d8b29ef | 2013-09-02 03:11:02 +0300 | [diff] [blame] | 316 | } |
Oren Weil | ab84116 | 2011-05-15 13:43:41 +0300 | [diff] [blame] | 317 | |
Oren Weil | ab84116 | 2011-05-15 13:43:41 +0300 | [diff] [blame] | 318 | if (cl == &dev->iamthif_cl) { |
Alexander Usyskin | 6cbb097 | 2016-02-10 23:57:26 +0200 | [diff] [blame] | 319 | rets = mei_amthif_write(cl, cb); |
| 320 | if (!rets) |
| 321 | rets = length; |
| 322 | goto out; |
Oren Weil | ab84116 | 2011-05-15 13:43:41 +0300 | [diff] [blame] | 323 | } |
| 324 | |
Alexander Usyskin | 6cbb097 | 2016-02-10 23:57:26 +0200 | [diff] [blame] | 325 | rets = mei_cl_write(cl, cb, false); |
Tomas Winkler | b0d0cf7 | 2012-11-01 21:17:13 +0200 | [diff] [blame] | 326 | out: |
Oren Weil | ab84116 | 2011-05-15 13:43:41 +0300 | [diff] [blame] | 327 | mutex_unlock(&dev->device_lock); |
Oren Weil | ab84116 | 2011-05-15 13:43:41 +0300 | [diff] [blame] | 328 | return rets; |
| 329 | } |
| 330 | |
Tomas Winkler | 9f81abda | 2013-01-08 23:07:15 +0200 | [diff] [blame] | 331 | /** |
| 332 | * mei_ioctl_connect_client - the connect to fw client IOCTL function |
| 333 | * |
Tomas Winkler | 9f81abda | 2013-01-08 23:07:15 +0200 | [diff] [blame] | 334 | * @file: private data of the file object |
Alexander Usyskin | a8605ea | 2014-09-29 16:31:49 +0300 | [diff] [blame] | 335 | * @data: IOCTL connect data, input and output parameters |
Tomas Winkler | 9f81abda | 2013-01-08 23:07:15 +0200 | [diff] [blame] | 336 | * |
| 337 | * Locking: called under "dev->device_lock" lock |
| 338 | * |
Alexander Usyskin | a8605ea | 2014-09-29 16:31:49 +0300 | [diff] [blame] | 339 | * Return: 0 on success, <0 on failure. |
Tomas Winkler | 9f81abda | 2013-01-08 23:07:15 +0200 | [diff] [blame] | 340 | */ |
| 341 | static int mei_ioctl_connect_client(struct file *file, |
| 342 | struct mei_connect_client_data *data) |
| 343 | { |
| 344 | struct mei_device *dev; |
| 345 | struct mei_client *client; |
Tomas Winkler | d320832 | 2014-08-24 12:08:55 +0300 | [diff] [blame] | 346 | struct mei_me_client *me_cl; |
Tomas Winkler | 9f81abda | 2013-01-08 23:07:15 +0200 | [diff] [blame] | 347 | struct mei_cl *cl; |
Tomas Winkler | 9f81abda | 2013-01-08 23:07:15 +0200 | [diff] [blame] | 348 | int rets; |
| 349 | |
| 350 | cl = file->private_data; |
Tomas Winkler | 9f81abda | 2013-01-08 23:07:15 +0200 | [diff] [blame] | 351 | dev = cl->dev; |
| 352 | |
Tomas Winkler | 79563db | 2015-01-11 00:07:16 +0200 | [diff] [blame] | 353 | if (dev->dev_state != MEI_DEV_ENABLED) |
| 354 | return -ENODEV; |
Tomas Winkler | 9f81abda | 2013-01-08 23:07:15 +0200 | [diff] [blame] | 355 | |
| 356 | if (cl->state != MEI_FILE_INITIALIZING && |
Tomas Winkler | 79563db | 2015-01-11 00:07:16 +0200 | [diff] [blame] | 357 | cl->state != MEI_FILE_DISCONNECTED) |
| 358 | return -EBUSY; |
Tomas Winkler | 9f81abda | 2013-01-08 23:07:15 +0200 | [diff] [blame] | 359 | |
| 360 | /* find ME client we're trying to connect to */ |
Tomas Winkler | d320832 | 2014-08-24 12:08:55 +0300 | [diff] [blame] | 361 | me_cl = mei_me_cl_by_uuid(dev, &data->in_client_uuid); |
Alexander Usyskin | f4e0624 | 2016-02-07 23:35:38 +0200 | [diff] [blame] | 362 | if (!me_cl) { |
Tomas Winkler | 2bf94cab | 2014-09-29 16:31:42 +0300 | [diff] [blame] | 363 | dev_dbg(dev->dev, "Cannot connect to FW Client UUID = %pUl\n", |
Alexander Usyskin | d49ed64 | 2015-05-04 09:43:54 +0300 | [diff] [blame] | 364 | &data->in_client_uuid); |
Alexander Usyskin | f4e0624 | 2016-02-07 23:35:38 +0200 | [diff] [blame] | 365 | rets = -ENOTTY; |
| 366 | goto end; |
| 367 | } |
| 368 | |
| 369 | if (me_cl->props.fixed_address) { |
| 370 | bool forbidden = dev->override_fixed_address ? |
| 371 | !dev->allow_fixed_address : !dev->hbm_f_fa_supported; |
| 372 | if (forbidden) { |
| 373 | dev_dbg(dev->dev, "Connection forbidden to FW Client UUID = %pUl\n", |
| 374 | &data->in_client_uuid); |
| 375 | rets = -ENOTTY; |
| 376 | goto end; |
| 377 | } |
Tomas Winkler | 9f81abda | 2013-01-08 23:07:15 +0200 | [diff] [blame] | 378 | } |
| 379 | |
Tomas Winkler | 2bf94cab | 2014-09-29 16:31:42 +0300 | [diff] [blame] | 380 | dev_dbg(dev->dev, "Connect to FW Client ID = %d\n", |
Alexander Usyskin | d49ed64 | 2015-05-04 09:43:54 +0300 | [diff] [blame] | 381 | me_cl->client_id); |
Tomas Winkler | 2bf94cab | 2014-09-29 16:31:42 +0300 | [diff] [blame] | 382 | dev_dbg(dev->dev, "FW Client - Protocol Version = %d\n", |
Tomas Winkler | d320832 | 2014-08-24 12:08:55 +0300 | [diff] [blame] | 383 | me_cl->props.protocol_version); |
Tomas Winkler | 2bf94cab | 2014-09-29 16:31:42 +0300 | [diff] [blame] | 384 | dev_dbg(dev->dev, "FW Client - Max Msg Len = %d\n", |
Tomas Winkler | d320832 | 2014-08-24 12:08:55 +0300 | [diff] [blame] | 385 | me_cl->props.max_msg_length); |
Tomas Winkler | 9f81abda | 2013-01-08 23:07:15 +0200 | [diff] [blame] | 386 | |
Tomas Winkler | 1a1aca4 | 2013-01-08 23:07:21 +0200 | [diff] [blame] | 387 | /* if we're connecting to amthif client then we will use the |
Tomas Winkler | 9f81abda | 2013-01-08 23:07:15 +0200 | [diff] [blame] | 388 | * existing connection |
| 389 | */ |
Tomas Winkler | 1a1aca4 | 2013-01-08 23:07:21 +0200 | [diff] [blame] | 390 | if (uuid_le_cmp(data->in_client_uuid, mei_amthif_guid) == 0) { |
Tomas Winkler | 2bf94cab | 2014-09-29 16:31:42 +0300 | [diff] [blame] | 391 | dev_dbg(dev->dev, "FW Client is amthi\n"); |
Tomas Winkler | f3de9b6 | 2015-03-27 00:27:58 +0200 | [diff] [blame] | 392 | if (!mei_cl_is_connected(&dev->iamthif_cl)) { |
Tomas Winkler | 9f81abda | 2013-01-08 23:07:15 +0200 | [diff] [blame] | 393 | rets = -ENODEV; |
| 394 | goto end; |
| 395 | } |
Tomas Winkler | 9f81abda | 2013-01-08 23:07:15 +0200 | [diff] [blame] | 396 | mei_cl_unlink(cl); |
| 397 | |
| 398 | kfree(cl); |
| 399 | cl = NULL; |
Tomas Winkler | 22f96a0 | 2013-09-16 23:44:47 +0300 | [diff] [blame] | 400 | dev->iamthif_open_count++; |
Tomas Winkler | 9f81abda | 2013-01-08 23:07:15 +0200 | [diff] [blame] | 401 | file->private_data = &dev->iamthif_cl; |
| 402 | |
| 403 | client = &data->out_client_properties; |
Tomas Winkler | d320832 | 2014-08-24 12:08:55 +0300 | [diff] [blame] | 404 | client->max_msg_length = me_cl->props.max_msg_length; |
| 405 | client->protocol_version = me_cl->props.protocol_version; |
Tomas Winkler | 9f81abda | 2013-01-08 23:07:15 +0200 | [diff] [blame] | 406 | rets = dev->iamthif_cl.status; |
| 407 | |
| 408 | goto end; |
| 409 | } |
| 410 | |
Tomas Winkler | 9f81abda | 2013-01-08 23:07:15 +0200 | [diff] [blame] | 411 | /* prepare the output buffer */ |
| 412 | client = &data->out_client_properties; |
Tomas Winkler | d320832 | 2014-08-24 12:08:55 +0300 | [diff] [blame] | 413 | client->max_msg_length = me_cl->props.max_msg_length; |
| 414 | client->protocol_version = me_cl->props.protocol_version; |
Tomas Winkler | 2bf94cab | 2014-09-29 16:31:42 +0300 | [diff] [blame] | 415 | dev_dbg(dev->dev, "Can connect?\n"); |
Tomas Winkler | 9f81abda | 2013-01-08 23:07:15 +0200 | [diff] [blame] | 416 | |
Alexander Usyskin | d49ed64 | 2015-05-04 09:43:54 +0300 | [diff] [blame] | 417 | rets = mei_cl_connect(cl, me_cl, file); |
Tomas Winkler | 9f81abda | 2013-01-08 23:07:15 +0200 | [diff] [blame] | 418 | |
| 419 | end: |
Tomas Winkler | 79563db | 2015-01-11 00:07:16 +0200 | [diff] [blame] | 420 | mei_me_cl_put(me_cl); |
Tomas Winkler | 9f81abda | 2013-01-08 23:07:15 +0200 | [diff] [blame] | 421 | return rets; |
| 422 | } |
| 423 | |
Oren Weil | ab84116 | 2011-05-15 13:43:41 +0300 | [diff] [blame] | 424 | /** |
Tomas Winkler | 3c7c846 | 2015-07-26 09:54:20 +0300 | [diff] [blame] | 425 | * mei_ioctl_client_notify_request - |
| 426 | * propagate event notification request to client |
| 427 | * |
| 428 | * @file: pointer to file structure |
| 429 | * @request: 0 - disable, 1 - enable |
| 430 | * |
| 431 | * Return: 0 on success , <0 on error |
| 432 | */ |
Tomas Winkler | f23e2cc | 2016-02-07 23:35:23 +0200 | [diff] [blame] | 433 | static int mei_ioctl_client_notify_request(const struct file *file, u32 request) |
Tomas Winkler | 3c7c846 | 2015-07-26 09:54:20 +0300 | [diff] [blame] | 434 | { |
| 435 | struct mei_cl *cl = file->private_data; |
| 436 | |
Alexander Usyskin | 7326fff | 2016-01-17 12:25:01 +0200 | [diff] [blame] | 437 | if (request != MEI_HBM_NOTIFICATION_START && |
| 438 | request != MEI_HBM_NOTIFICATION_STOP) |
| 439 | return -EINVAL; |
| 440 | |
| 441 | return mei_cl_notify_request(cl, file, (u8)request); |
Tomas Winkler | 3c7c846 | 2015-07-26 09:54:20 +0300 | [diff] [blame] | 442 | } |
| 443 | |
| 444 | /** |
| 445 | * mei_ioctl_client_notify_get - wait for notification request |
| 446 | * |
| 447 | * @file: pointer to file structure |
| 448 | * @notify_get: 0 - disable, 1 - enable |
| 449 | * |
| 450 | * Return: 0 on success , <0 on error |
| 451 | */ |
Tomas Winkler | f23e2cc | 2016-02-07 23:35:23 +0200 | [diff] [blame] | 452 | static int mei_ioctl_client_notify_get(const struct file *file, u32 *notify_get) |
Tomas Winkler | 3c7c846 | 2015-07-26 09:54:20 +0300 | [diff] [blame] | 453 | { |
| 454 | struct mei_cl *cl = file->private_data; |
| 455 | bool notify_ev; |
| 456 | bool block = (file->f_flags & O_NONBLOCK) == 0; |
| 457 | int rets; |
| 458 | |
| 459 | rets = mei_cl_notify_get(cl, block, ¬ify_ev); |
| 460 | if (rets) |
| 461 | return rets; |
| 462 | |
| 463 | *notify_get = notify_ev ? 1 : 0; |
| 464 | return 0; |
| 465 | } |
| 466 | |
| 467 | /** |
Oren Weil | ab84116 | 2011-05-15 13:43:41 +0300 | [diff] [blame] | 468 | * mei_ioctl - the IOCTL function |
| 469 | * |
| 470 | * @file: pointer to file structure |
| 471 | * @cmd: ioctl command |
| 472 | * @data: pointer to mei message structure |
| 473 | * |
Alexander Usyskin | a8605ea | 2014-09-29 16:31:49 +0300 | [diff] [blame] | 474 | * Return: 0 on success , <0 on error |
Oren Weil | ab84116 | 2011-05-15 13:43:41 +0300 | [diff] [blame] | 475 | */ |
| 476 | static long mei_ioctl(struct file *file, unsigned int cmd, unsigned long data) |
| 477 | { |
| 478 | struct mei_device *dev; |
| 479 | struct mei_cl *cl = file->private_data; |
Tomas Winkler | 154eb18 | 2014-08-21 14:29:23 +0300 | [diff] [blame] | 480 | struct mei_connect_client_data connect_data; |
Tomas Winkler | 3c7c846 | 2015-07-26 09:54:20 +0300 | [diff] [blame] | 481 | u32 notify_get, notify_req; |
Oren Weil | ab84116 | 2011-05-15 13:43:41 +0300 | [diff] [blame] | 482 | int rets; |
| 483 | |
Oren Weil | ab84116 | 2011-05-15 13:43:41 +0300 | [diff] [blame] | 484 | |
| 485 | if (WARN_ON(!cl || !cl->dev)) |
| 486 | return -ENODEV; |
| 487 | |
| 488 | dev = cl->dev; |
| 489 | |
Tomas Winkler | 2bf94cab | 2014-09-29 16:31:42 +0300 | [diff] [blame] | 490 | dev_dbg(dev->dev, "IOCTL cmd = 0x%x", cmd); |
Oren Weil | ab84116 | 2011-05-15 13:43:41 +0300 | [diff] [blame] | 491 | |
| 492 | mutex_lock(&dev->device_lock); |
Tomas Winkler | b210d75 | 2012-08-07 00:03:56 +0300 | [diff] [blame] | 493 | if (dev->dev_state != MEI_DEV_ENABLED) { |
Oren Weil | ab84116 | 2011-05-15 13:43:41 +0300 | [diff] [blame] | 494 | rets = -ENODEV; |
| 495 | goto out; |
| 496 | } |
| 497 | |
Tomas Winkler | 4f046e7 | 2014-08-21 14:29:22 +0300 | [diff] [blame] | 498 | switch (cmd) { |
| 499 | case IOCTL_MEI_CONNECT_CLIENT: |
Tomas Winkler | 2bf94cab | 2014-09-29 16:31:42 +0300 | [diff] [blame] | 500 | dev_dbg(dev->dev, ": IOCTL_MEI_CONNECT_CLIENT.\n"); |
Tomas Winkler | 154eb18 | 2014-08-21 14:29:23 +0300 | [diff] [blame] | 501 | if (copy_from_user(&connect_data, (char __user *)data, |
Oren Weil | ab84116 | 2011-05-15 13:43:41 +0300 | [diff] [blame] | 502 | sizeof(struct mei_connect_client_data))) { |
Tomas Winkler | 2bf94cab | 2014-09-29 16:31:42 +0300 | [diff] [blame] | 503 | dev_dbg(dev->dev, "failed to copy data from userland\n"); |
Tomas Winkler | 4f046e7 | 2014-08-21 14:29:22 +0300 | [diff] [blame] | 504 | rets = -EFAULT; |
| 505 | goto out; |
| 506 | } |
Tomas Winkler | 9f81abda | 2013-01-08 23:07:15 +0200 | [diff] [blame] | 507 | |
Tomas Winkler | 154eb18 | 2014-08-21 14:29:23 +0300 | [diff] [blame] | 508 | rets = mei_ioctl_connect_client(file, &connect_data); |
Tomas Winkler | 4f046e7 | 2014-08-21 14:29:22 +0300 | [diff] [blame] | 509 | if (rets) |
| 510 | goto out; |
Oren Weil | ab84116 | 2011-05-15 13:43:41 +0300 | [diff] [blame] | 511 | |
Tomas Winkler | 4f046e7 | 2014-08-21 14:29:22 +0300 | [diff] [blame] | 512 | /* if all is ok, copying the data back to user. */ |
Tomas Winkler | 154eb18 | 2014-08-21 14:29:23 +0300 | [diff] [blame] | 513 | if (copy_to_user((char __user *)data, &connect_data, |
Oren Weil | ab84116 | 2011-05-15 13:43:41 +0300 | [diff] [blame] | 514 | sizeof(struct mei_connect_client_data))) { |
Tomas Winkler | 2bf94cab | 2014-09-29 16:31:42 +0300 | [diff] [blame] | 515 | dev_dbg(dev->dev, "failed to copy data to userland\n"); |
Tomas Winkler | 4f046e7 | 2014-08-21 14:29:22 +0300 | [diff] [blame] | 516 | rets = -EFAULT; |
| 517 | goto out; |
| 518 | } |
| 519 | |
| 520 | break; |
Tomas Winkler | 154eb18 | 2014-08-21 14:29:23 +0300 | [diff] [blame] | 521 | |
Tomas Winkler | 3c7c846 | 2015-07-26 09:54:20 +0300 | [diff] [blame] | 522 | case IOCTL_MEI_NOTIFY_SET: |
| 523 | dev_dbg(dev->dev, ": IOCTL_MEI_NOTIFY_SET.\n"); |
| 524 | if (copy_from_user(¬ify_req, |
| 525 | (char __user *)data, sizeof(notify_req))) { |
| 526 | dev_dbg(dev->dev, "failed to copy data from userland\n"); |
| 527 | rets = -EFAULT; |
| 528 | goto out; |
| 529 | } |
| 530 | rets = mei_ioctl_client_notify_request(file, notify_req); |
| 531 | break; |
| 532 | |
| 533 | case IOCTL_MEI_NOTIFY_GET: |
| 534 | dev_dbg(dev->dev, ": IOCTL_MEI_NOTIFY_GET.\n"); |
| 535 | rets = mei_ioctl_client_notify_get(file, ¬ify_get); |
| 536 | if (rets) |
| 537 | goto out; |
| 538 | |
| 539 | dev_dbg(dev->dev, "copy connect data to user\n"); |
| 540 | if (copy_to_user((char __user *)data, |
| 541 | ¬ify_get, sizeof(notify_get))) { |
| 542 | dev_dbg(dev->dev, "failed to copy data to userland\n"); |
| 543 | rets = -EFAULT; |
| 544 | goto out; |
| 545 | |
| 546 | } |
| 547 | break; |
| 548 | |
Tomas Winkler | 4f046e7 | 2014-08-21 14:29:22 +0300 | [diff] [blame] | 549 | default: |
Tomas Winkler | 2bf94cab | 2014-09-29 16:31:42 +0300 | [diff] [blame] | 550 | dev_err(dev->dev, ": unsupported ioctl %d.\n", cmd); |
Tomas Winkler | 4f046e7 | 2014-08-21 14:29:22 +0300 | [diff] [blame] | 551 | rets = -ENOIOCTLCMD; |
Oren Weil | ab84116 | 2011-05-15 13:43:41 +0300 | [diff] [blame] | 552 | } |
| 553 | |
| 554 | out: |
Oren Weil | ab84116 | 2011-05-15 13:43:41 +0300 | [diff] [blame] | 555 | mutex_unlock(&dev->device_lock); |
| 556 | return rets; |
| 557 | } |
| 558 | |
| 559 | /** |
| 560 | * mei_compat_ioctl - the compat IOCTL function |
| 561 | * |
| 562 | * @file: pointer to file structure |
| 563 | * @cmd: ioctl command |
| 564 | * @data: pointer to mei message structure |
| 565 | * |
Alexander Usyskin | a8605ea | 2014-09-29 16:31:49 +0300 | [diff] [blame] | 566 | * Return: 0 on success , <0 on error |
Oren Weil | ab84116 | 2011-05-15 13:43:41 +0300 | [diff] [blame] | 567 | */ |
| 568 | #ifdef CONFIG_COMPAT |
| 569 | static long mei_compat_ioctl(struct file *file, |
Tomas Winkler | 441ab50 | 2011-12-13 23:39:34 +0200 | [diff] [blame] | 570 | unsigned int cmd, unsigned long data) |
Oren Weil | ab84116 | 2011-05-15 13:43:41 +0300 | [diff] [blame] | 571 | { |
| 572 | return mei_ioctl(file, cmd, (unsigned long)compat_ptr(data)); |
| 573 | } |
| 574 | #endif |
| 575 | |
| 576 | |
| 577 | /** |
| 578 | * mei_poll - the poll function |
| 579 | * |
| 580 | * @file: pointer to file structure |
| 581 | * @wait: pointer to poll_table structure |
| 582 | * |
Alexander Usyskin | a8605ea | 2014-09-29 16:31:49 +0300 | [diff] [blame] | 583 | * Return: poll mask |
Oren Weil | ab84116 | 2011-05-15 13:43:41 +0300 | [diff] [blame] | 584 | */ |
| 585 | static unsigned int mei_poll(struct file *file, poll_table *wait) |
| 586 | { |
Tomas Winkler | 1d9013f | 2015-03-27 00:27:57 +0200 | [diff] [blame] | 587 | unsigned long req_events = poll_requested_events(wait); |
Oren Weil | ab84116 | 2011-05-15 13:43:41 +0300 | [diff] [blame] | 588 | struct mei_cl *cl = file->private_data; |
| 589 | struct mei_device *dev; |
| 590 | unsigned int mask = 0; |
Tomas Winkler | 2c84c29 | 2015-07-26 09:54:21 +0300 | [diff] [blame] | 591 | bool notify_en; |
Oren Weil | ab84116 | 2011-05-15 13:43:41 +0300 | [diff] [blame] | 592 | |
| 593 | if (WARN_ON(!cl || !cl->dev)) |
Tomas Winkler | b950ac1 | 2013-07-25 20:15:53 +0300 | [diff] [blame] | 594 | return POLLERR; |
Oren Weil | ab84116 | 2011-05-15 13:43:41 +0300 | [diff] [blame] | 595 | |
| 596 | dev = cl->dev; |
| 597 | |
| 598 | mutex_lock(&dev->device_lock); |
| 599 | |
Tomas Winkler | 2c84c29 | 2015-07-26 09:54:21 +0300 | [diff] [blame] | 600 | notify_en = cl->notify_en && (req_events & POLLPRI); |
Tomas Winkler | f3de9b6 | 2015-03-27 00:27:58 +0200 | [diff] [blame] | 601 | |
| 602 | if (dev->dev_state != MEI_DEV_ENABLED || |
| 603 | !mei_cl_is_connected(cl)) { |
Tomas Winkler | b950ac1 | 2013-07-25 20:15:53 +0300 | [diff] [blame] | 604 | mask = POLLERR; |
Oren Weil | ab84116 | 2011-05-15 13:43:41 +0300 | [diff] [blame] | 605 | goto out; |
| 606 | } |
| 607 | |
Tomas Winkler | 2c84c29 | 2015-07-26 09:54:21 +0300 | [diff] [blame] | 608 | if (notify_en) { |
| 609 | poll_wait(file, &cl->ev_wait, wait); |
| 610 | if (cl->notify_ev) |
| 611 | mask |= POLLPRI; |
| 612 | } |
| 613 | |
Alexander Usyskin | 9fa0be8 | 2016-05-24 16:03:38 -0400 | [diff] [blame] | 614 | if (cl == &dev->iamthif_cl) { |
| 615 | mask |= mei_amthif_poll(file, wait); |
| 616 | goto out; |
| 617 | } |
| 618 | |
Tomas Winkler | 1d9013f | 2015-03-27 00:27:57 +0200 | [diff] [blame] | 619 | if (req_events & (POLLIN | POLLRDNORM)) { |
| 620 | poll_wait(file, &cl->rx_wait, wait); |
| 621 | |
| 622 | if (!list_empty(&cl->rd_completed)) |
| 623 | mask |= POLLIN | POLLRDNORM; |
| 624 | else |
Tomas Winkler | 3030dc0 | 2016-07-26 01:06:05 +0300 | [diff] [blame] | 625 | mei_cl_read_start(cl, mei_cl_mtu(cl), file); |
Tomas Winkler | 1d9013f | 2015-03-27 00:27:57 +0200 | [diff] [blame] | 626 | } |
Oren Weil | ab84116 | 2011-05-15 13:43:41 +0300 | [diff] [blame] | 627 | |
| 628 | out: |
| 629 | mutex_unlock(&dev->device_lock); |
| 630 | return mask; |
| 631 | } |
| 632 | |
Tomas Winkler | 55c4e64 | 2014-11-19 17:01:39 +0200 | [diff] [blame] | 633 | /** |
Tomas Winkler | 237092b | 2015-07-26 09:54:22 +0300 | [diff] [blame] | 634 | * mei_fasync - asynchronous io support |
| 635 | * |
| 636 | * @fd: file descriptor |
| 637 | * @file: pointer to file structure |
| 638 | * @band: band bitmap |
| 639 | * |
Tomas Winkler | ed6dc53 | 2016-01-07 14:46:38 +0200 | [diff] [blame] | 640 | * Return: negative on error, |
| 641 | * 0 if it did no changes, |
| 642 | * and positive a process was added or deleted |
Tomas Winkler | 237092b | 2015-07-26 09:54:22 +0300 | [diff] [blame] | 643 | */ |
| 644 | static int mei_fasync(int fd, struct file *file, int band) |
| 645 | { |
| 646 | |
| 647 | struct mei_cl *cl = file->private_data; |
| 648 | |
| 649 | if (!mei_cl_is_connected(cl)) |
Tomas Winkler | ed6dc53 | 2016-01-07 14:46:38 +0200 | [diff] [blame] | 650 | return -ENODEV; |
Tomas Winkler | 237092b | 2015-07-26 09:54:22 +0300 | [diff] [blame] | 651 | |
| 652 | return fasync_helper(fd, file, band, &cl->ev_async); |
| 653 | } |
| 654 | |
| 655 | /** |
Tomas Winkler | 55c4e64 | 2014-11-19 17:01:39 +0200 | [diff] [blame] | 656 | * fw_status_show - mei device attribute show method |
| 657 | * |
| 658 | * @device: device pointer |
| 659 | * @attr: attribute pointer |
| 660 | * @buf: char out buffer |
| 661 | * |
| 662 | * Return: number of the bytes printed into buf or error |
| 663 | */ |
| 664 | static ssize_t fw_status_show(struct device *device, |
| 665 | struct device_attribute *attr, char *buf) |
| 666 | { |
| 667 | struct mei_device *dev = dev_get_drvdata(device); |
| 668 | struct mei_fw_status fw_status; |
| 669 | int err, i; |
| 670 | ssize_t cnt = 0; |
| 671 | |
| 672 | mutex_lock(&dev->device_lock); |
| 673 | err = mei_fw_status(dev, &fw_status); |
| 674 | mutex_unlock(&dev->device_lock); |
| 675 | if (err) { |
| 676 | dev_err(device, "read fw_status error = %d\n", err); |
| 677 | return err; |
| 678 | } |
| 679 | |
| 680 | for (i = 0; i < fw_status.count; i++) |
| 681 | cnt += scnprintf(buf + cnt, PAGE_SIZE - cnt, "%08X\n", |
| 682 | fw_status.status[i]); |
| 683 | return cnt; |
| 684 | } |
| 685 | static DEVICE_ATTR_RO(fw_status); |
| 686 | |
| 687 | static struct attribute *mei_attrs[] = { |
| 688 | &dev_attr_fw_status.attr, |
| 689 | NULL |
| 690 | }; |
| 691 | ATTRIBUTE_GROUPS(mei); |
| 692 | |
Oren Weil | 5b881e3 | 2011-11-13 09:41:14 +0200 | [diff] [blame] | 693 | /* |
| 694 | * file operations structure will be used for mei char device. |
| 695 | */ |
| 696 | static const struct file_operations mei_fops = { |
| 697 | .owner = THIS_MODULE, |
| 698 | .read = mei_read, |
| 699 | .unlocked_ioctl = mei_ioctl, |
| 700 | #ifdef CONFIG_COMPAT |
| 701 | .compat_ioctl = mei_compat_ioctl, |
| 702 | #endif |
| 703 | .open = mei_open, |
| 704 | .release = mei_release, |
| 705 | .write = mei_write, |
| 706 | .poll = mei_poll, |
Tomas Winkler | 237092b | 2015-07-26 09:54:22 +0300 | [diff] [blame] | 707 | .fasync = mei_fasync, |
Oren Weil | 5b881e3 | 2011-11-13 09:41:14 +0200 | [diff] [blame] | 708 | .llseek = no_llseek |
| 709 | }; |
| 710 | |
Alexander Usyskin | f3d8e87 | 2014-06-23 15:10:35 +0300 | [diff] [blame] | 711 | static struct class *mei_class; |
| 712 | static dev_t mei_devt; |
| 713 | #define MEI_MAX_DEVS MINORMASK |
| 714 | static DEFINE_MUTEX(mei_minor_lock); |
| 715 | static DEFINE_IDR(mei_idr); |
| 716 | |
| 717 | /** |
| 718 | * mei_minor_get - obtain next free device minor number |
| 719 | * |
| 720 | * @dev: device pointer |
| 721 | * |
Alexander Usyskin | a8605ea | 2014-09-29 16:31:49 +0300 | [diff] [blame] | 722 | * Return: allocated minor, or -ENOSPC if no free minor left |
Oren Weil | 5b881e3 | 2011-11-13 09:41:14 +0200 | [diff] [blame] | 723 | */ |
Alexander Usyskin | f3d8e87 | 2014-06-23 15:10:35 +0300 | [diff] [blame] | 724 | static int mei_minor_get(struct mei_device *dev) |
Tomas Winkler | 9a123f1 | 2012-08-06 15:23:55 +0300 | [diff] [blame] | 725 | { |
Tomas Winkler | 30e53bb | 2013-04-05 22:10:34 +0300 | [diff] [blame] | 726 | int ret; |
Alexander Usyskin | f3d8e87 | 2014-06-23 15:10:35 +0300 | [diff] [blame] | 727 | |
| 728 | mutex_lock(&mei_minor_lock); |
| 729 | ret = idr_alloc(&mei_idr, dev, 0, MEI_MAX_DEVS, GFP_KERNEL); |
| 730 | if (ret >= 0) |
| 731 | dev->minor = ret; |
| 732 | else if (ret == -ENOSPC) |
Tomas Winkler | 2bf94cab | 2014-09-29 16:31:42 +0300 | [diff] [blame] | 733 | dev_err(dev->dev, "too many mei devices\n"); |
Alexander Usyskin | f3d8e87 | 2014-06-23 15:10:35 +0300 | [diff] [blame] | 734 | |
| 735 | mutex_unlock(&mei_minor_lock); |
| 736 | return ret; |
| 737 | } |
| 738 | |
| 739 | /** |
| 740 | * mei_minor_free - mark device minor number as free |
| 741 | * |
| 742 | * @dev: device pointer |
| 743 | */ |
| 744 | static void mei_minor_free(struct mei_device *dev) |
| 745 | { |
| 746 | mutex_lock(&mei_minor_lock); |
| 747 | idr_remove(&mei_idr, dev->minor); |
| 748 | mutex_unlock(&mei_minor_lock); |
| 749 | } |
| 750 | |
| 751 | int mei_register(struct mei_device *dev, struct device *parent) |
| 752 | { |
| 753 | struct device *clsdev; /* class device */ |
| 754 | int ret, devno; |
| 755 | |
| 756 | ret = mei_minor_get(dev); |
| 757 | if (ret < 0) |
Tomas Winkler | 30e53bb | 2013-04-05 22:10:34 +0300 | [diff] [blame] | 758 | return ret; |
| 759 | |
Alexander Usyskin | f3d8e87 | 2014-06-23 15:10:35 +0300 | [diff] [blame] | 760 | /* Fill in the data structures */ |
| 761 | devno = MKDEV(MAJOR(mei_devt), dev->minor); |
| 762 | cdev_init(&dev->cdev, &mei_fops); |
Tomas Winkler | 154322f | 2015-06-18 11:41:03 +0300 | [diff] [blame] | 763 | dev->cdev.owner = parent->driver->owner; |
Alexander Usyskin | f3d8e87 | 2014-06-23 15:10:35 +0300 | [diff] [blame] | 764 | |
| 765 | /* Add the device */ |
| 766 | ret = cdev_add(&dev->cdev, devno, 1); |
| 767 | if (ret) { |
| 768 | dev_err(parent, "unable to add device %d:%d\n", |
| 769 | MAJOR(mei_devt), dev->minor); |
| 770 | goto err_dev_add; |
| 771 | } |
| 772 | |
Tomas Winkler | 55c4e64 | 2014-11-19 17:01:39 +0200 | [diff] [blame] | 773 | clsdev = device_create_with_groups(mei_class, parent, devno, |
| 774 | dev, mei_groups, |
| 775 | "mei%d", dev->minor); |
Alexander Usyskin | f3d8e87 | 2014-06-23 15:10:35 +0300 | [diff] [blame] | 776 | |
| 777 | if (IS_ERR(clsdev)) { |
| 778 | dev_err(parent, "unable to create device %d:%d\n", |
| 779 | MAJOR(mei_devt), dev->minor); |
| 780 | ret = PTR_ERR(clsdev); |
| 781 | goto err_dev_create; |
| 782 | } |
| 783 | |
| 784 | ret = mei_dbgfs_register(dev, dev_name(clsdev)); |
| 785 | if (ret) { |
| 786 | dev_err(clsdev, "cannot register debugfs ret = %d\n", ret); |
| 787 | goto err_dev_dbgfs; |
| 788 | } |
Tomas Winkler | 30e53bb | 2013-04-05 22:10:34 +0300 | [diff] [blame] | 789 | |
| 790 | return 0; |
Alexander Usyskin | f3d8e87 | 2014-06-23 15:10:35 +0300 | [diff] [blame] | 791 | |
| 792 | err_dev_dbgfs: |
| 793 | device_destroy(mei_class, devno); |
| 794 | err_dev_create: |
| 795 | cdev_del(&dev->cdev); |
| 796 | err_dev_add: |
| 797 | mei_minor_free(dev); |
| 798 | return ret; |
Oren Weil | 5b881e3 | 2011-11-13 09:41:14 +0200 | [diff] [blame] | 799 | } |
Tomas Winkler | 40e0b67 | 2013-03-27 16:58:30 +0200 | [diff] [blame] | 800 | EXPORT_SYMBOL_GPL(mei_register); |
Oren Weil | 5b881e3 | 2011-11-13 09:41:14 +0200 | [diff] [blame] | 801 | |
Tomas Winkler | 30e53bb | 2013-04-05 22:10:34 +0300 | [diff] [blame] | 802 | void mei_deregister(struct mei_device *dev) |
Oren Weil | 5b881e3 | 2011-11-13 09:41:14 +0200 | [diff] [blame] | 803 | { |
Alexander Usyskin | f3d8e87 | 2014-06-23 15:10:35 +0300 | [diff] [blame] | 804 | int devno; |
| 805 | |
| 806 | devno = dev->cdev.dev; |
| 807 | cdev_del(&dev->cdev); |
| 808 | |
Tomas Winkler | 30e53bb | 2013-04-05 22:10:34 +0300 | [diff] [blame] | 809 | mei_dbgfs_deregister(dev); |
Alexander Usyskin | f3d8e87 | 2014-06-23 15:10:35 +0300 | [diff] [blame] | 810 | |
| 811 | device_destroy(mei_class, devno); |
| 812 | |
| 813 | mei_minor_free(dev); |
Oren Weil | ab84116 | 2011-05-15 13:43:41 +0300 | [diff] [blame] | 814 | } |
Tomas Winkler | 40e0b67 | 2013-03-27 16:58:30 +0200 | [diff] [blame] | 815 | EXPORT_SYMBOL_GPL(mei_deregister); |
Oren Weil | ab84116 | 2011-05-15 13:43:41 +0300 | [diff] [blame] | 816 | |
Samuel Ortiz | cf3baef | 2013-03-27 17:29:57 +0200 | [diff] [blame] | 817 | static int __init mei_init(void) |
| 818 | { |
Alexander Usyskin | f3d8e87 | 2014-06-23 15:10:35 +0300 | [diff] [blame] | 819 | int ret; |
| 820 | |
| 821 | mei_class = class_create(THIS_MODULE, "mei"); |
| 822 | if (IS_ERR(mei_class)) { |
| 823 | pr_err("couldn't create class\n"); |
| 824 | ret = PTR_ERR(mei_class); |
| 825 | goto err; |
| 826 | } |
| 827 | |
| 828 | ret = alloc_chrdev_region(&mei_devt, 0, MEI_MAX_DEVS, "mei"); |
| 829 | if (ret < 0) { |
| 830 | pr_err("unable to allocate char dev region\n"); |
| 831 | goto err_class; |
| 832 | } |
| 833 | |
| 834 | ret = mei_cl_bus_init(); |
| 835 | if (ret < 0) { |
| 836 | pr_err("unable to initialize bus\n"); |
| 837 | goto err_chrdev; |
| 838 | } |
| 839 | |
| 840 | return 0; |
| 841 | |
| 842 | err_chrdev: |
| 843 | unregister_chrdev_region(mei_devt, MEI_MAX_DEVS); |
| 844 | err_class: |
| 845 | class_destroy(mei_class); |
| 846 | err: |
| 847 | return ret; |
Samuel Ortiz | cf3baef | 2013-03-27 17:29:57 +0200 | [diff] [blame] | 848 | } |
| 849 | |
| 850 | static void __exit mei_exit(void) |
| 851 | { |
Alexander Usyskin | f3d8e87 | 2014-06-23 15:10:35 +0300 | [diff] [blame] | 852 | unregister_chrdev_region(mei_devt, MEI_MAX_DEVS); |
| 853 | class_destroy(mei_class); |
Samuel Ortiz | cf3baef | 2013-03-27 17:29:57 +0200 | [diff] [blame] | 854 | mei_cl_bus_exit(); |
| 855 | } |
| 856 | |
| 857 | module_init(mei_init); |
| 858 | module_exit(mei_exit); |
| 859 | |
Tomas Winkler | 40e0b67 | 2013-03-27 16:58:30 +0200 | [diff] [blame] | 860 | MODULE_AUTHOR("Intel Corporation"); |
| 861 | MODULE_DESCRIPTION("Intel(R) Management Engine Interface"); |
Tomas Winkler | 827eef5 | 2013-02-06 14:06:41 +0200 | [diff] [blame] | 862 | MODULE_LICENSE("GPL v2"); |
Oren Weil | ab84116 | 2011-05-15 13:43:41 +0300 | [diff] [blame] | 863 | |