Zhao Yakui | e92b297 | 2010-12-08 10:10:18 +0800 | [diff] [blame] | 1 | /* |
| 2 | * acpi_ipmi.c - ACPI IPMI opregion |
| 3 | * |
| 4 | * Copyright (C) 2010 Intel Corporation |
| 5 | * Copyright (C) 2010 Zhao Yakui <yakui.zhao@intel.com> |
| 6 | * |
| 7 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
| 8 | * |
| 9 | * This program is free software; you can redistribute it and/or modify |
| 10 | * it under the terms of the GNU General Public License as published by |
| 11 | * the Free Software Foundation; either version 2 of the License, or (at |
| 12 | * your option) any later version. |
| 13 | * |
| 14 | * This program is distributed in the hope that it will be useful, but |
| 15 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 17 | * General Public License for more details. |
| 18 | * |
| 19 | * You should have received a copy of the GNU General Public License along |
| 20 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 21 | * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. |
| 22 | * |
| 23 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
| 24 | */ |
| 25 | |
| 26 | #include <linux/kernel.h> |
| 27 | #include <linux/module.h> |
| 28 | #include <linux/init.h> |
| 29 | #include <linux/types.h> |
| 30 | #include <linux/delay.h> |
| 31 | #include <linux/proc_fs.h> |
| 32 | #include <linux/seq_file.h> |
| 33 | #include <linux/interrupt.h> |
| 34 | #include <linux/list.h> |
| 35 | #include <linux/spinlock.h> |
| 36 | #include <linux/io.h> |
| 37 | #include <acpi/acpi_bus.h> |
| 38 | #include <acpi/acpi_drivers.h> |
| 39 | #include <linux/ipmi.h> |
| 40 | #include <linux/device.h> |
| 41 | #include <linux/pnp.h> |
Lv Zheng | 06a8566 | 2013-09-13 13:13:23 +0800 | [diff] [blame] | 42 | #include <linux/spinlock.h> |
Zhao Yakui | e92b297 | 2010-12-08 10:10:18 +0800 | [diff] [blame] | 43 | |
| 44 | MODULE_AUTHOR("Zhao Yakui"); |
| 45 | MODULE_DESCRIPTION("ACPI IPMI Opregion driver"); |
| 46 | MODULE_LICENSE("GPL"); |
| 47 | |
| 48 | #define IPMI_FLAGS_HANDLER_INSTALL 0 |
| 49 | |
| 50 | #define ACPI_IPMI_OK 0 |
| 51 | #define ACPI_IPMI_TIMEOUT 0x10 |
| 52 | #define ACPI_IPMI_UNKNOWN 0x07 |
| 53 | /* the IPMI timeout is 5s */ |
Lv Zheng | 8584ec6 | 2013-09-13 13:13:47 +0800 | [diff] [blame^] | 54 | #define IPMI_TIMEOUT (5000) |
Lv Zheng | 6b68f03 | 2013-09-13 13:13:30 +0800 | [diff] [blame] | 55 | #define ACPI_IPMI_MAX_MSG_LENGTH 64 |
Zhao Yakui | e92b297 | 2010-12-08 10:10:18 +0800 | [diff] [blame] | 56 | |
| 57 | struct acpi_ipmi_device { |
| 58 | /* the device list attached to driver_data.ipmi_devices */ |
| 59 | struct list_head head; |
| 60 | /* the IPMI request message list */ |
| 61 | struct list_head tx_msg_list; |
Lv Zheng | 06a8566 | 2013-09-13 13:13:23 +0800 | [diff] [blame] | 62 | spinlock_t tx_msg_lock; |
Zhao Yakui | e92b297 | 2010-12-08 10:10:18 +0800 | [diff] [blame] | 63 | acpi_handle handle; |
| 64 | struct pnp_dev *pnp_dev; |
| 65 | ipmi_user_t user_interface; |
| 66 | int ipmi_ifnum; /* IPMI interface number */ |
| 67 | long curr_msgid; |
| 68 | unsigned long flags; |
| 69 | struct ipmi_smi_info smi_data; |
| 70 | }; |
| 71 | |
| 72 | struct ipmi_driver_data { |
| 73 | struct list_head ipmi_devices; |
| 74 | struct ipmi_smi_watcher bmc_events; |
| 75 | struct ipmi_user_hndl ipmi_hndlrs; |
| 76 | struct mutex ipmi_lock; |
| 77 | }; |
| 78 | |
| 79 | struct acpi_ipmi_msg { |
| 80 | struct list_head head; |
| 81 | /* |
| 82 | * General speaking the addr type should be SI_ADDR_TYPE. And |
| 83 | * the addr channel should be BMC. |
| 84 | * In fact it can also be IPMB type. But we will have to |
| 85 | * parse it from the Netfn command buffer. It is so complex |
| 86 | * that it is skipped. |
| 87 | */ |
| 88 | struct ipmi_addr addr; |
| 89 | long tx_msgid; |
| 90 | /* it is used to track whether the IPMI message is finished */ |
| 91 | struct completion tx_complete; |
| 92 | struct kernel_ipmi_msg tx_message; |
| 93 | int msg_done; |
Lv Zheng | 6b68f03 | 2013-09-13 13:13:30 +0800 | [diff] [blame] | 94 | /* tx/rx data . And copy it from/to ACPI object buffer */ |
| 95 | u8 data[ACPI_IPMI_MAX_MSG_LENGTH]; |
| 96 | u8 rx_len; |
Zhao Yakui | e92b297 | 2010-12-08 10:10:18 +0800 | [diff] [blame] | 97 | struct acpi_ipmi_device *device; |
| 98 | }; |
| 99 | |
| 100 | /* IPMI request/response buffer per ACPI 4.0, sec 5.5.2.4.3.2 */ |
| 101 | struct acpi_ipmi_buffer { |
| 102 | u8 status; |
| 103 | u8 length; |
Lv Zheng | 6b68f03 | 2013-09-13 13:13:30 +0800 | [diff] [blame] | 104 | u8 data[ACPI_IPMI_MAX_MSG_LENGTH]; |
Zhao Yakui | e92b297 | 2010-12-08 10:10:18 +0800 | [diff] [blame] | 105 | }; |
| 106 | |
| 107 | static void ipmi_register_bmc(int iface, struct device *dev); |
| 108 | static void ipmi_bmc_gone(int iface); |
| 109 | static void ipmi_msg_handler(struct ipmi_recv_msg *msg, void *user_msg_data); |
| 110 | static void acpi_add_ipmi_device(struct acpi_ipmi_device *ipmi_device); |
| 111 | static void acpi_remove_ipmi_device(struct acpi_ipmi_device *ipmi_device); |
| 112 | |
| 113 | static struct ipmi_driver_data driver_data = { |
| 114 | .ipmi_devices = LIST_HEAD_INIT(driver_data.ipmi_devices), |
| 115 | .bmc_events = { |
| 116 | .owner = THIS_MODULE, |
| 117 | .new_smi = ipmi_register_bmc, |
| 118 | .smi_gone = ipmi_bmc_gone, |
| 119 | }, |
| 120 | .ipmi_hndlrs = { |
| 121 | .ipmi_recv_hndl = ipmi_msg_handler, |
| 122 | }, |
| 123 | }; |
| 124 | |
| 125 | static struct acpi_ipmi_msg *acpi_alloc_ipmi_msg(struct acpi_ipmi_device *ipmi) |
| 126 | { |
| 127 | struct acpi_ipmi_msg *ipmi_msg; |
| 128 | struct pnp_dev *pnp_dev = ipmi->pnp_dev; |
| 129 | |
| 130 | ipmi_msg = kzalloc(sizeof(struct acpi_ipmi_msg), GFP_KERNEL); |
| 131 | if (!ipmi_msg) { |
| 132 | dev_warn(&pnp_dev->dev, "Can't allocate memory for ipmi_msg\n"); |
| 133 | return NULL; |
| 134 | } |
| 135 | init_completion(&ipmi_msg->tx_complete); |
| 136 | INIT_LIST_HEAD(&ipmi_msg->head); |
| 137 | ipmi_msg->device = ipmi; |
Lv Zheng | 8584ec6 | 2013-09-13 13:13:47 +0800 | [diff] [blame^] | 138 | ipmi_msg->msg_done = ACPI_IPMI_UNKNOWN; |
Zhao Yakui | e92b297 | 2010-12-08 10:10:18 +0800 | [diff] [blame] | 139 | return ipmi_msg; |
| 140 | } |
| 141 | |
| 142 | #define IPMI_OP_RGN_NETFN(offset) ((offset >> 8) & 0xff) |
| 143 | #define IPMI_OP_RGN_CMD(offset) (offset & 0xff) |
Lv Zheng | 6b68f03 | 2013-09-13 13:13:30 +0800 | [diff] [blame] | 144 | static int acpi_format_ipmi_request(struct acpi_ipmi_msg *tx_msg, |
Zhao Yakui | e92b297 | 2010-12-08 10:10:18 +0800 | [diff] [blame] | 145 | acpi_physical_address address, |
| 146 | acpi_integer *value) |
| 147 | { |
| 148 | struct kernel_ipmi_msg *msg; |
| 149 | struct acpi_ipmi_buffer *buffer; |
| 150 | struct acpi_ipmi_device *device; |
Lv Zheng | 06a8566 | 2013-09-13 13:13:23 +0800 | [diff] [blame] | 151 | unsigned long flags; |
Zhao Yakui | e92b297 | 2010-12-08 10:10:18 +0800 | [diff] [blame] | 152 | |
| 153 | msg = &tx_msg->tx_message; |
| 154 | /* |
| 155 | * IPMI network function and command are encoded in the address |
| 156 | * within the IPMI OpRegion; see ACPI 4.0, sec 5.5.2.4.3. |
| 157 | */ |
| 158 | msg->netfn = IPMI_OP_RGN_NETFN(address); |
| 159 | msg->cmd = IPMI_OP_RGN_CMD(address); |
Lv Zheng | 6b68f03 | 2013-09-13 13:13:30 +0800 | [diff] [blame] | 160 | msg->data = tx_msg->data; |
Zhao Yakui | e92b297 | 2010-12-08 10:10:18 +0800 | [diff] [blame] | 161 | /* |
| 162 | * value is the parameter passed by the IPMI opregion space handler. |
| 163 | * It points to the IPMI request message buffer |
| 164 | */ |
| 165 | buffer = (struct acpi_ipmi_buffer *)value; |
| 166 | /* copy the tx message data */ |
Lv Zheng | 6b68f03 | 2013-09-13 13:13:30 +0800 | [diff] [blame] | 167 | if (buffer->length > ACPI_IPMI_MAX_MSG_LENGTH) { |
| 168 | dev_WARN_ONCE(&tx_msg->device->pnp_dev->dev, true, |
| 169 | "Unexpected request (msg len %d).\n", |
| 170 | buffer->length); |
| 171 | return -EINVAL; |
| 172 | } |
Zhao Yakui | e92b297 | 2010-12-08 10:10:18 +0800 | [diff] [blame] | 173 | msg->data_len = buffer->length; |
Lv Zheng | 6b68f03 | 2013-09-13 13:13:30 +0800 | [diff] [blame] | 174 | memcpy(tx_msg->data, buffer->data, msg->data_len); |
Zhao Yakui | e92b297 | 2010-12-08 10:10:18 +0800 | [diff] [blame] | 175 | /* |
| 176 | * now the default type is SYSTEM_INTERFACE and channel type is BMC. |
| 177 | * If the netfn is APP_REQUEST and the cmd is SEND_MESSAGE, |
| 178 | * the addr type should be changed to IPMB. Then we will have to parse |
| 179 | * the IPMI request message buffer to get the IPMB address. |
| 180 | * If so, please fix me. |
| 181 | */ |
| 182 | tx_msg->addr.addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE; |
| 183 | tx_msg->addr.channel = IPMI_BMC_CHANNEL; |
| 184 | tx_msg->addr.data[0] = 0; |
| 185 | |
| 186 | /* Get the msgid */ |
| 187 | device = tx_msg->device; |
Lv Zheng | 06a8566 | 2013-09-13 13:13:23 +0800 | [diff] [blame] | 188 | spin_lock_irqsave(&device->tx_msg_lock, flags); |
Zhao Yakui | e92b297 | 2010-12-08 10:10:18 +0800 | [diff] [blame] | 189 | device->curr_msgid++; |
| 190 | tx_msg->tx_msgid = device->curr_msgid; |
Lv Zheng | 06a8566 | 2013-09-13 13:13:23 +0800 | [diff] [blame] | 191 | spin_unlock_irqrestore(&device->tx_msg_lock, flags); |
Lv Zheng | 6b68f03 | 2013-09-13 13:13:30 +0800 | [diff] [blame] | 192 | return 0; |
Zhao Yakui | e92b297 | 2010-12-08 10:10:18 +0800 | [diff] [blame] | 193 | } |
| 194 | |
| 195 | static void acpi_format_ipmi_response(struct acpi_ipmi_msg *msg, |
Lv Zheng | 8584ec6 | 2013-09-13 13:13:47 +0800 | [diff] [blame^] | 196 | acpi_integer *value) |
Zhao Yakui | e92b297 | 2010-12-08 10:10:18 +0800 | [diff] [blame] | 197 | { |
| 198 | struct acpi_ipmi_buffer *buffer; |
| 199 | |
| 200 | /* |
| 201 | * value is also used as output parameter. It represents the response |
| 202 | * IPMI message returned by IPMI command. |
| 203 | */ |
| 204 | buffer = (struct acpi_ipmi_buffer *)value; |
Zhao Yakui | e92b297 | 2010-12-08 10:10:18 +0800 | [diff] [blame] | 205 | /* |
Lv Zheng | 8584ec6 | 2013-09-13 13:13:47 +0800 | [diff] [blame^] | 206 | * If the flag of msg_done is not set, it means that the IPMI command is |
| 207 | * not executed correctly. |
Zhao Yakui | e92b297 | 2010-12-08 10:10:18 +0800 | [diff] [blame] | 208 | */ |
Lv Zheng | 8584ec6 | 2013-09-13 13:13:47 +0800 | [diff] [blame^] | 209 | buffer->status = msg->msg_done; |
| 210 | if (msg->msg_done != ACPI_IPMI_OK) |
Zhao Yakui | e92b297 | 2010-12-08 10:10:18 +0800 | [diff] [blame] | 211 | return; |
Zhao Yakui | e92b297 | 2010-12-08 10:10:18 +0800 | [diff] [blame] | 212 | /* |
| 213 | * If the IPMI response message is obtained correctly, the status code |
| 214 | * will be ACPI_IPMI_OK |
| 215 | */ |
Zhao Yakui | e92b297 | 2010-12-08 10:10:18 +0800 | [diff] [blame] | 216 | buffer->length = msg->rx_len; |
Lv Zheng | 6b68f03 | 2013-09-13 13:13:30 +0800 | [diff] [blame] | 217 | memcpy(buffer->data, msg->data, msg->rx_len); |
Zhao Yakui | e92b297 | 2010-12-08 10:10:18 +0800 | [diff] [blame] | 218 | } |
| 219 | |
| 220 | static void ipmi_flush_tx_msg(struct acpi_ipmi_device *ipmi) |
| 221 | { |
| 222 | struct acpi_ipmi_msg *tx_msg, *temp; |
| 223 | int count = HZ / 10; |
| 224 | struct pnp_dev *pnp_dev = ipmi->pnp_dev; |
Lv Zheng | 5ac557e | 2013-09-13 13:13:39 +0800 | [diff] [blame] | 225 | unsigned long flags; |
Zhao Yakui | e92b297 | 2010-12-08 10:10:18 +0800 | [diff] [blame] | 226 | |
Lv Zheng | 5ac557e | 2013-09-13 13:13:39 +0800 | [diff] [blame] | 227 | spin_lock_irqsave(&ipmi->tx_msg_lock, flags); |
Zhao Yakui | e92b297 | 2010-12-08 10:10:18 +0800 | [diff] [blame] | 228 | list_for_each_entry_safe(tx_msg, temp, &ipmi->tx_msg_list, head) { |
| 229 | /* wake up the sleep thread on the Tx msg */ |
| 230 | complete(&tx_msg->tx_complete); |
| 231 | } |
Lv Zheng | 5ac557e | 2013-09-13 13:13:39 +0800 | [diff] [blame] | 232 | spin_unlock_irqrestore(&ipmi->tx_msg_lock, flags); |
Zhao Yakui | e92b297 | 2010-12-08 10:10:18 +0800 | [diff] [blame] | 233 | |
| 234 | /* wait for about 100ms to flush the tx message list */ |
| 235 | while (count--) { |
| 236 | if (list_empty(&ipmi->tx_msg_list)) |
| 237 | break; |
| 238 | schedule_timeout(1); |
| 239 | } |
| 240 | if (!list_empty(&ipmi->tx_msg_list)) |
| 241 | dev_warn(&pnp_dev->dev, "tx msg list is not NULL\n"); |
| 242 | } |
| 243 | |
| 244 | static void ipmi_msg_handler(struct ipmi_recv_msg *msg, void *user_msg_data) |
| 245 | { |
| 246 | struct acpi_ipmi_device *ipmi_device = user_msg_data; |
| 247 | int msg_found = 0; |
| 248 | struct acpi_ipmi_msg *tx_msg; |
| 249 | struct pnp_dev *pnp_dev = ipmi_device->pnp_dev; |
Lv Zheng | 06a8566 | 2013-09-13 13:13:23 +0800 | [diff] [blame] | 250 | unsigned long flags; |
Zhao Yakui | e92b297 | 2010-12-08 10:10:18 +0800 | [diff] [blame] | 251 | |
| 252 | if (msg->user != ipmi_device->user_interface) { |
| 253 | dev_warn(&pnp_dev->dev, "Unexpected response is returned. " |
| 254 | "returned user %p, expected user %p\n", |
| 255 | msg->user, ipmi_device->user_interface); |
Lv Zheng | 6b68f03 | 2013-09-13 13:13:30 +0800 | [diff] [blame] | 256 | goto out_msg; |
Zhao Yakui | e92b297 | 2010-12-08 10:10:18 +0800 | [diff] [blame] | 257 | } |
Lv Zheng | 06a8566 | 2013-09-13 13:13:23 +0800 | [diff] [blame] | 258 | spin_lock_irqsave(&ipmi_device->tx_msg_lock, flags); |
Zhao Yakui | e92b297 | 2010-12-08 10:10:18 +0800 | [diff] [blame] | 259 | list_for_each_entry(tx_msg, &ipmi_device->tx_msg_list, head) { |
| 260 | if (msg->msgid == tx_msg->tx_msgid) { |
| 261 | msg_found = 1; |
| 262 | break; |
| 263 | } |
| 264 | } |
| 265 | |
Zhao Yakui | e92b297 | 2010-12-08 10:10:18 +0800 | [diff] [blame] | 266 | if (!msg_found) { |
| 267 | dev_warn(&pnp_dev->dev, "Unexpected response (msg id %ld) is " |
| 268 | "returned.\n", msg->msgid); |
Lv Zheng | 5ac557e | 2013-09-13 13:13:39 +0800 | [diff] [blame] | 269 | goto out_lock; |
Zhao Yakui | e92b297 | 2010-12-08 10:10:18 +0800 | [diff] [blame] | 270 | } |
| 271 | |
Lv Zheng | 6b68f03 | 2013-09-13 13:13:30 +0800 | [diff] [blame] | 272 | /* copy the response data to Rx_data buffer */ |
| 273 | if (msg->msg.data_len > ACPI_IPMI_MAX_MSG_LENGTH) { |
| 274 | dev_WARN_ONCE(&pnp_dev->dev, true, |
| 275 | "Unexpected response (msg len %d).\n", |
| 276 | msg->msg.data_len); |
Lv Zheng | 8584ec6 | 2013-09-13 13:13:47 +0800 | [diff] [blame^] | 277 | goto out_comp; |
Zhao Yakui | e92b297 | 2010-12-08 10:10:18 +0800 | [diff] [blame] | 278 | } |
Lv Zheng | 8584ec6 | 2013-09-13 13:13:47 +0800 | [diff] [blame^] | 279 | /* response msg is an error msg */ |
| 280 | msg->recv_type = IPMI_RESPONSE_RECV_TYPE; |
| 281 | if (msg->recv_type == IPMI_RESPONSE_RECV_TYPE && |
| 282 | msg->msg.data_len == 1) { |
| 283 | if (msg->msg.data[0] == IPMI_TIMEOUT_COMPLETION_CODE) { |
| 284 | dev_WARN_ONCE(&pnp_dev->dev, true, |
| 285 | "Unexpected response (timeout).\n"); |
| 286 | tx_msg->msg_done = ACPI_IPMI_TIMEOUT; |
| 287 | } |
| 288 | goto out_comp; |
| 289 | } |
| 290 | tx_msg->rx_len = msg->msg.data_len; |
| 291 | memcpy(tx_msg->data, msg->msg.data, tx_msg->rx_len); |
| 292 | tx_msg->msg_done = ACPI_IPMI_OK; |
| 293 | out_comp: |
Zhao Yakui | e92b297 | 2010-12-08 10:10:18 +0800 | [diff] [blame] | 294 | complete(&tx_msg->tx_complete); |
Lv Zheng | 5ac557e | 2013-09-13 13:13:39 +0800 | [diff] [blame] | 295 | out_lock: |
| 296 | spin_unlock_irqrestore(&ipmi_device->tx_msg_lock, flags); |
Lv Zheng | 6b68f03 | 2013-09-13 13:13:30 +0800 | [diff] [blame] | 297 | out_msg: |
Zhao Yakui | e92b297 | 2010-12-08 10:10:18 +0800 | [diff] [blame] | 298 | ipmi_free_recv_msg(msg); |
| 299 | }; |
| 300 | |
| 301 | static void ipmi_register_bmc(int iface, struct device *dev) |
| 302 | { |
| 303 | struct acpi_ipmi_device *ipmi_device, *temp; |
| 304 | struct pnp_dev *pnp_dev; |
| 305 | ipmi_user_t user; |
| 306 | int err; |
| 307 | struct ipmi_smi_info smi_data; |
| 308 | acpi_handle handle; |
| 309 | |
| 310 | err = ipmi_get_smi_info(iface, &smi_data); |
| 311 | |
| 312 | if (err) |
| 313 | return; |
| 314 | |
| 315 | if (smi_data.addr_src != SI_ACPI) { |
| 316 | put_device(smi_data.dev); |
| 317 | return; |
| 318 | } |
| 319 | |
| 320 | handle = smi_data.addr_info.acpi_info.acpi_handle; |
| 321 | |
| 322 | mutex_lock(&driver_data.ipmi_lock); |
| 323 | list_for_each_entry(temp, &driver_data.ipmi_devices, head) { |
| 324 | /* |
| 325 | * if the corresponding ACPI handle is already added |
| 326 | * to the device list, don't add it again. |
| 327 | */ |
| 328 | if (temp->handle == handle) |
| 329 | goto out; |
| 330 | } |
| 331 | |
| 332 | ipmi_device = kzalloc(sizeof(*ipmi_device), GFP_KERNEL); |
| 333 | |
| 334 | if (!ipmi_device) |
| 335 | goto out; |
| 336 | |
| 337 | pnp_dev = to_pnp_dev(smi_data.dev); |
| 338 | ipmi_device->handle = handle; |
| 339 | ipmi_device->pnp_dev = pnp_dev; |
| 340 | |
| 341 | err = ipmi_create_user(iface, &driver_data.ipmi_hndlrs, |
| 342 | ipmi_device, &user); |
| 343 | if (err) { |
| 344 | dev_warn(&pnp_dev->dev, "Can't create IPMI user interface\n"); |
| 345 | kfree(ipmi_device); |
| 346 | goto out; |
| 347 | } |
| 348 | acpi_add_ipmi_device(ipmi_device); |
| 349 | ipmi_device->user_interface = user; |
| 350 | ipmi_device->ipmi_ifnum = iface; |
| 351 | mutex_unlock(&driver_data.ipmi_lock); |
| 352 | memcpy(&ipmi_device->smi_data, &smi_data, sizeof(struct ipmi_smi_info)); |
| 353 | return; |
| 354 | |
| 355 | out: |
| 356 | mutex_unlock(&driver_data.ipmi_lock); |
| 357 | put_device(smi_data.dev); |
| 358 | return; |
| 359 | } |
| 360 | |
| 361 | static void ipmi_bmc_gone(int iface) |
| 362 | { |
| 363 | struct acpi_ipmi_device *ipmi_device, *temp; |
| 364 | |
| 365 | mutex_lock(&driver_data.ipmi_lock); |
| 366 | list_for_each_entry_safe(ipmi_device, temp, |
| 367 | &driver_data.ipmi_devices, head) { |
| 368 | if (ipmi_device->ipmi_ifnum != iface) |
| 369 | continue; |
| 370 | |
| 371 | acpi_remove_ipmi_device(ipmi_device); |
| 372 | put_device(ipmi_device->smi_data.dev); |
| 373 | kfree(ipmi_device); |
| 374 | break; |
| 375 | } |
| 376 | mutex_unlock(&driver_data.ipmi_lock); |
| 377 | } |
| 378 | /* -------------------------------------------------------------------------- |
| 379 | * Address Space Management |
| 380 | * -------------------------------------------------------------------------- */ |
| 381 | /* |
| 382 | * This is the IPMI opregion space handler. |
| 383 | * @function: indicates the read/write. In fact as the IPMI message is driven |
| 384 | * by command, only write is meaningful. |
| 385 | * @address: This contains the netfn/command of IPMI request message. |
| 386 | * @bits : not used. |
| 387 | * @value : it is an in/out parameter. It points to the IPMI message buffer. |
| 388 | * Before the IPMI message is sent, it represents the actual request |
| 389 | * IPMI message. After the IPMI message is finished, it represents |
| 390 | * the response IPMI message returned by IPMI command. |
| 391 | * @handler_context: IPMI device context. |
| 392 | */ |
| 393 | |
| 394 | static acpi_status |
| 395 | acpi_ipmi_space_handler(u32 function, acpi_physical_address address, |
| 396 | u32 bits, acpi_integer *value, |
| 397 | void *handler_context, void *region_context) |
| 398 | { |
| 399 | struct acpi_ipmi_msg *tx_msg; |
| 400 | struct acpi_ipmi_device *ipmi_device = handler_context; |
Lv Zheng | 8584ec6 | 2013-09-13 13:13:47 +0800 | [diff] [blame^] | 401 | int err; |
Zhao Yakui | e92b297 | 2010-12-08 10:10:18 +0800 | [diff] [blame] | 402 | acpi_status status; |
Lv Zheng | 06a8566 | 2013-09-13 13:13:23 +0800 | [diff] [blame] | 403 | unsigned long flags; |
Zhao Yakui | e92b297 | 2010-12-08 10:10:18 +0800 | [diff] [blame] | 404 | /* |
| 405 | * IPMI opregion message. |
| 406 | * IPMI message is firstly written to the BMC and system software |
| 407 | * can get the respsonse. So it is unmeaningful for the read access |
| 408 | * of IPMI opregion. |
| 409 | */ |
| 410 | if ((function & ACPI_IO_MASK) == ACPI_READ) |
| 411 | return AE_TYPE; |
| 412 | |
| 413 | if (!ipmi_device->user_interface) |
| 414 | return AE_NOT_EXIST; |
| 415 | |
| 416 | tx_msg = acpi_alloc_ipmi_msg(ipmi_device); |
| 417 | if (!tx_msg) |
| 418 | return AE_NO_MEMORY; |
| 419 | |
Lv Zheng | 6b68f03 | 2013-09-13 13:13:30 +0800 | [diff] [blame] | 420 | if (acpi_format_ipmi_request(tx_msg, address, value) != 0) { |
| 421 | status = AE_TYPE; |
| 422 | goto out_msg; |
| 423 | } |
Lv Zheng | 06a8566 | 2013-09-13 13:13:23 +0800 | [diff] [blame] | 424 | spin_lock_irqsave(&ipmi_device->tx_msg_lock, flags); |
Zhao Yakui | e92b297 | 2010-12-08 10:10:18 +0800 | [diff] [blame] | 425 | list_add_tail(&tx_msg->head, &ipmi_device->tx_msg_list); |
Lv Zheng | 06a8566 | 2013-09-13 13:13:23 +0800 | [diff] [blame] | 426 | spin_unlock_irqrestore(&ipmi_device->tx_msg_lock, flags); |
Zhao Yakui | e92b297 | 2010-12-08 10:10:18 +0800 | [diff] [blame] | 427 | err = ipmi_request_settime(ipmi_device->user_interface, |
| 428 | &tx_msg->addr, |
| 429 | tx_msg->tx_msgid, |
| 430 | &tx_msg->tx_message, |
Lv Zheng | 8584ec6 | 2013-09-13 13:13:47 +0800 | [diff] [blame^] | 431 | NULL, 0, 0, IPMI_TIMEOUT); |
Zhao Yakui | e92b297 | 2010-12-08 10:10:18 +0800 | [diff] [blame] | 432 | if (err) { |
| 433 | status = AE_ERROR; |
Lv Zheng | 6b68f03 | 2013-09-13 13:13:30 +0800 | [diff] [blame] | 434 | goto out_list; |
Zhao Yakui | e92b297 | 2010-12-08 10:10:18 +0800 | [diff] [blame] | 435 | } |
Lv Zheng | 8584ec6 | 2013-09-13 13:13:47 +0800 | [diff] [blame^] | 436 | wait_for_completion(&tx_msg->tx_complete); |
| 437 | acpi_format_ipmi_response(tx_msg, value); |
Zhao Yakui | e92b297 | 2010-12-08 10:10:18 +0800 | [diff] [blame] | 438 | status = AE_OK; |
| 439 | |
Lv Zheng | 6b68f03 | 2013-09-13 13:13:30 +0800 | [diff] [blame] | 440 | out_list: |
Lv Zheng | 06a8566 | 2013-09-13 13:13:23 +0800 | [diff] [blame] | 441 | spin_lock_irqsave(&ipmi_device->tx_msg_lock, flags); |
Zhao Yakui | e92b297 | 2010-12-08 10:10:18 +0800 | [diff] [blame] | 442 | list_del(&tx_msg->head); |
Lv Zheng | 06a8566 | 2013-09-13 13:13:23 +0800 | [diff] [blame] | 443 | spin_unlock_irqrestore(&ipmi_device->tx_msg_lock, flags); |
Lv Zheng | 6b68f03 | 2013-09-13 13:13:30 +0800 | [diff] [blame] | 444 | out_msg: |
Zhao Yakui | e92b297 | 2010-12-08 10:10:18 +0800 | [diff] [blame] | 445 | kfree(tx_msg); |
| 446 | return status; |
| 447 | } |
| 448 | |
| 449 | static void ipmi_remove_space_handler(struct acpi_ipmi_device *ipmi) |
| 450 | { |
| 451 | if (!test_bit(IPMI_FLAGS_HANDLER_INSTALL, &ipmi->flags)) |
| 452 | return; |
| 453 | |
| 454 | acpi_remove_address_space_handler(ipmi->handle, |
| 455 | ACPI_ADR_SPACE_IPMI, &acpi_ipmi_space_handler); |
| 456 | |
| 457 | clear_bit(IPMI_FLAGS_HANDLER_INSTALL, &ipmi->flags); |
| 458 | } |
| 459 | |
| 460 | static int ipmi_install_space_handler(struct acpi_ipmi_device *ipmi) |
| 461 | { |
| 462 | acpi_status status; |
| 463 | |
| 464 | if (test_bit(IPMI_FLAGS_HANDLER_INSTALL, &ipmi->flags)) |
| 465 | return 0; |
| 466 | |
| 467 | status = acpi_install_address_space_handler(ipmi->handle, |
| 468 | ACPI_ADR_SPACE_IPMI, |
| 469 | &acpi_ipmi_space_handler, |
| 470 | NULL, ipmi); |
| 471 | if (ACPI_FAILURE(status)) { |
| 472 | struct pnp_dev *pnp_dev = ipmi->pnp_dev; |
| 473 | dev_warn(&pnp_dev->dev, "Can't register IPMI opregion space " |
| 474 | "handle\n"); |
| 475 | return -EINVAL; |
| 476 | } |
| 477 | set_bit(IPMI_FLAGS_HANDLER_INSTALL, &ipmi->flags); |
| 478 | return 0; |
| 479 | } |
| 480 | |
| 481 | static void acpi_add_ipmi_device(struct acpi_ipmi_device *ipmi_device) |
| 482 | { |
| 483 | |
| 484 | INIT_LIST_HEAD(&ipmi_device->head); |
| 485 | |
Lv Zheng | 06a8566 | 2013-09-13 13:13:23 +0800 | [diff] [blame] | 486 | spin_lock_init(&ipmi_device->tx_msg_lock); |
Zhao Yakui | e92b297 | 2010-12-08 10:10:18 +0800 | [diff] [blame] | 487 | INIT_LIST_HEAD(&ipmi_device->tx_msg_list); |
| 488 | ipmi_install_space_handler(ipmi_device); |
| 489 | |
| 490 | list_add_tail(&ipmi_device->head, &driver_data.ipmi_devices); |
| 491 | } |
| 492 | |
| 493 | static void acpi_remove_ipmi_device(struct acpi_ipmi_device *ipmi_device) |
| 494 | { |
| 495 | /* |
| 496 | * If the IPMI user interface is created, it should be |
| 497 | * destroyed. |
| 498 | */ |
| 499 | if (ipmi_device->user_interface) { |
| 500 | ipmi_destroy_user(ipmi_device->user_interface); |
| 501 | ipmi_device->user_interface = NULL; |
| 502 | } |
| 503 | /* flush the Tx_msg list */ |
| 504 | if (!list_empty(&ipmi_device->tx_msg_list)) |
| 505 | ipmi_flush_tx_msg(ipmi_device); |
| 506 | |
| 507 | list_del(&ipmi_device->head); |
| 508 | ipmi_remove_space_handler(ipmi_device); |
| 509 | } |
| 510 | |
| 511 | static int __init acpi_ipmi_init(void) |
| 512 | { |
| 513 | int result = 0; |
| 514 | |
| 515 | if (acpi_disabled) |
| 516 | return result; |
| 517 | |
| 518 | mutex_init(&driver_data.ipmi_lock); |
| 519 | |
| 520 | result = ipmi_smi_watcher_register(&driver_data.bmc_events); |
| 521 | |
| 522 | return result; |
| 523 | } |
| 524 | |
| 525 | static void __exit acpi_ipmi_exit(void) |
| 526 | { |
| 527 | struct acpi_ipmi_device *ipmi_device, *temp; |
| 528 | |
| 529 | if (acpi_disabled) |
| 530 | return; |
| 531 | |
| 532 | ipmi_smi_watcher_unregister(&driver_data.bmc_events); |
| 533 | |
| 534 | /* |
| 535 | * When one smi_watcher is unregistered, it is only deleted |
| 536 | * from the smi_watcher list. But the smi_gone callback function |
| 537 | * is not called. So explicitly uninstall the ACPI IPMI oregion |
| 538 | * handler and free it. |
| 539 | */ |
| 540 | mutex_lock(&driver_data.ipmi_lock); |
| 541 | list_for_each_entry_safe(ipmi_device, temp, |
| 542 | &driver_data.ipmi_devices, head) { |
| 543 | acpi_remove_ipmi_device(ipmi_device); |
| 544 | put_device(ipmi_device->smi_data.dev); |
| 545 | kfree(ipmi_device); |
| 546 | } |
| 547 | mutex_unlock(&driver_data.ipmi_lock); |
| 548 | } |
| 549 | |
| 550 | module_init(acpi_ipmi_init); |
| 551 | module_exit(acpi_ipmi_exit); |