3  *  acpi_ipmi.c - ACPI IPMI opregion
12 #include <linux/ipmi.h>
16 MODULE_DESCRIPTION("ACPI IPMI Opregion driver");
22 /* the IPMI timeout is 5s */
30 	/* the IPMI request message list */
37 	int ipmi_ifnum; /* IPMI interface number */
50 	 * NOTE: IPMI System Interface Selection
51 	 * There is no system interface specified by the IPMI operation
53 	 * handle set.  IPMI messages passed from the ACPI codes are sent
54 	 * to this selected global IPMI system interface.
72 	/* it is used to track whether the IPMI message is finished */
86 /* IPMI request/response buffer per ACPI 4.0, sec 5.5.2.4.3.2 */
150 	struct acpi_ipmi_device *ipmi =  in ipmi_dev_release_kref()  local
153 	ipmi_dev_release(ipmi);  in ipmi_dev_release_kref()
190 	struct acpi_ipmi_device *ipmi;  in ipmi_msg_alloc()  local
193 	ipmi = acpi_ipmi_dev_get();  in ipmi_msg_alloc()
194 	if (!ipmi)  in ipmi_msg_alloc()
199 		acpi_ipmi_dev_put(ipmi);  in ipmi_msg_alloc()
206 	ipmi_msg->device = ipmi;  in ipmi_msg_alloc()
252 	 * IPMI network function and command are encoded in the address  in acpi_format_ipmi_request()
253 	 * within the IPMI OpRegion; see ACPI 4.0, sec 5.5.2.4.3.  in acpi_format_ipmi_request()
260 	 * value is the parameter passed by the IPMI opregion space handler.  in acpi_format_ipmi_request()
261 	 * It points to the IPMI request message buffer  in acpi_format_ipmi_request()
279 	 * the IPMI request message buffer to get the IPMB address.  in acpi_format_ipmi_request()
304 	 * IPMI message returned by IPMI command.  in acpi_format_ipmi_response()
309 	 * If the flag of msg_done is not set, it means that the IPMI command is  in acpi_format_ipmi_response()
317 	 * If the IPMI response message is obtained correctly, the status code  in acpi_format_ipmi_response()
324 static void ipmi_flush_tx_msg(struct acpi_ipmi_device *ipmi)  in ipmi_flush_tx_msg()  argument
337 	spin_lock_irqsave(&ipmi->tx_msg_lock, flags);  in ipmi_flush_tx_msg()
338 	while (!list_empty(&ipmi->tx_msg_list)) {  in ipmi_flush_tx_msg()
339 		tx_msg = list_first_entry(&ipmi->tx_msg_list,  in ipmi_flush_tx_msg()
343 		spin_unlock_irqrestore(&ipmi->tx_msg_lock, flags);  in ipmi_flush_tx_msg()
348 		spin_lock_irqsave(&ipmi->tx_msg_lock, flags);  in ipmi_flush_tx_msg()
350 	spin_unlock_irqrestore(&ipmi->tx_msg_lock, flags);  in ipmi_flush_tx_msg()
353 static void ipmi_cancel_tx_msg(struct acpi_ipmi_device *ipmi,  in ipmi_cancel_tx_msg()  argument
359 	spin_lock_irqsave(&ipmi->tx_msg_lock, flags);  in ipmi_cancel_tx_msg()
360 	list_for_each_entry_safe(iter, temp, &ipmi->tx_msg_list, head) {  in ipmi_cancel_tx_msg()
367 	spin_unlock_irqrestore(&ipmi->tx_msg_lock, flags);  in ipmi_cancel_tx_msg()
453 		dev_warn(smi_data.dev, "Can't create IPMI user interface\n");  in ipmi_register_bmc()
507  * This is the IPMI opregion space handler.
508  * @function: indicates the read/write. In fact as the IPMI message is driven
510  * @address: This contains the netfn/command of IPMI request message.
512  * @value  : it is an in/out parameter. It points to the IPMI message buffer.
513  *	     Before the IPMI message is sent, it represents the actual request
514  *	     IPMI message. After the IPMI message is finished, it represents
515  *	     the response IPMI message returned by IPMI command.
516  * @handler_context: IPMI device context.
530 	 * IPMI opregion message.  in acpi_ipmi_space_handler()
531 	 * IPMI message is firstly written to the BMC and system software  in acpi_ipmi_space_handler()
533 	 * of IPMI opregion.  in acpi_ipmi_space_handler()
594 		pr_warn("Can't register IPMI opregion space handle\n");  in acpi_ipmi_init()
603 		pr_err("Can't register IPMI system interface watcher\n");  in acpi_ipmi_init()
621 	 * is not called. So explicitly uninstall the ACPI IPMI oregion  in acpi_ipmi_exit()