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 */
32 	/* the IPMI request message list */
39 	int ipmi_ifnum; /* IPMI interface number */
52 	 * NOTE: IPMI System Interface Selection
53 	 * There is no system interface specified by the IPMI operation
55 	 * handle set.  IPMI messages passed from the ACPI codes are sent
56 	 * to this selected global IPMI system interface.
75 	/* it is used to track whether the IPMI message is finished */
89 /* IPMI request/response buffer per ACPI 4.0, sec 5.5.2.4.3.2 */
153 	struct acpi_ipmi_device *ipmi =  in ipmi_dev_release_kref()  local
156 	ipmi_dev_release(ipmi);  in ipmi_dev_release_kref()
193 	struct acpi_ipmi_device *ipmi;  in ipmi_msg_alloc()  local
196 	ipmi = acpi_ipmi_dev_get();  in ipmi_msg_alloc()
197 	if (!ipmi)  in ipmi_msg_alloc()
202 		acpi_ipmi_dev_put(ipmi);  in ipmi_msg_alloc()
209 	ipmi_msg->device = ipmi;  in ipmi_msg_alloc()
255 	 * IPMI network function and command are encoded in the address  in acpi_format_ipmi_request()
256 	 * within the IPMI OpRegion; see ACPI 4.0, sec 5.5.2.4.3.  in acpi_format_ipmi_request()
263 	 * value is the parameter passed by the IPMI opregion space handler.  in acpi_format_ipmi_request()
264 	 * It points to the IPMI request message buffer  in acpi_format_ipmi_request()
282 	 * the IPMI request message buffer to get the IPMB address.  in acpi_format_ipmi_request()
307 	 * IPMI message returned by IPMI command.  in acpi_format_ipmi_response()
312 	 * If the flag of msg_done is not set, it means that the IPMI command is  in acpi_format_ipmi_response()
320 	 * If the IPMI response message is obtained correctly, the status code  in acpi_format_ipmi_response()
327 static void ipmi_flush_tx_msg(struct acpi_ipmi_device *ipmi)  in ipmi_flush_tx_msg()  argument
340 	spin_lock_irqsave(&ipmi->tx_msg_lock, flags);  in ipmi_flush_tx_msg()
341 	while (!list_empty(&ipmi->tx_msg_list)) {  in ipmi_flush_tx_msg()
342 		tx_msg = list_first_entry(&ipmi->tx_msg_list,  in ipmi_flush_tx_msg()
346 		spin_unlock_irqrestore(&ipmi->tx_msg_lock, flags);  in ipmi_flush_tx_msg()
351 		spin_lock_irqsave(&ipmi->tx_msg_lock, flags);  in ipmi_flush_tx_msg()
353 	spin_unlock_irqrestore(&ipmi->tx_msg_lock, flags);  in ipmi_flush_tx_msg()
356 static void ipmi_cancel_tx_msg(struct acpi_ipmi_device *ipmi,  in ipmi_cancel_tx_msg()  argument
362 	spin_lock_irqsave(&ipmi->tx_msg_lock, flags);  in ipmi_cancel_tx_msg()
363 	list_for_each_entry_safe(iter, temp, &ipmi->tx_msg_list, head) {  in ipmi_cancel_tx_msg()
370 	spin_unlock_irqrestore(&ipmi->tx_msg_lock, flags);  in ipmi_cancel_tx_msg()
456 		dev_warn(smi_data.dev, "Can't create IPMI user interface\n");  in ipmi_register_bmc()
512  * This is the IPMI opregion space handler.
513  * @function: indicates the read/write. In fact as the IPMI message is driven
515  * @address: This contains the netfn/command of IPMI request message.
517  * @value  : it is an in/out parameter. It points to the IPMI message buffer.
518  *	     Before the IPMI message is sent, it represents the actual request
519  *	     IPMI message. After the IPMI message is finished, it represents
520  *	     the response IPMI message returned by IPMI command.
521  * @handler_context: IPMI device context.
535 	 * IPMI opregion message.  in acpi_ipmi_space_handler()
536 	 * IPMI message is firstly written to the BMC and system software  in acpi_ipmi_space_handler()
538 	 * of IPMI opregion.  in acpi_ipmi_space_handler()
615 		pr_warn("Can't register IPMI opregion space handle\n");  in acpi_ipmi_init()
624 		pr_err("Can't register IPMI system interface watcher\n");  in acpi_ipmi_init()
642 	 * is not called. So explicitly uninstall the ACPI IPMI oregion  in acpi_ipmi_exit()