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643 lines
16 KiB
643 lines
16 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* acpi_ipmi.c - ACPI IPMI opregion |
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* |
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* Copyright (C) 2010, 2013 Intel Corporation |
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* Author: Zhao Yakui <[email protected]> |
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* Lv Zheng <[email protected]> |
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*/ |
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|
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#include <linux/module.h> |
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#include <linux/acpi.h> |
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#include <linux/ipmi.h> |
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#include <linux/spinlock.h> |
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MODULE_AUTHOR("Zhao Yakui"); |
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MODULE_DESCRIPTION("ACPI IPMI Opregion driver"); |
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MODULE_LICENSE("GPL"); |
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#define ACPI_IPMI_OK 0 |
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#define ACPI_IPMI_TIMEOUT 0x10 |
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#define ACPI_IPMI_UNKNOWN 0x07 |
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/* the IPMI timeout is 5s */ |
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#define IPMI_TIMEOUT (5000) |
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#define ACPI_IPMI_MAX_MSG_LENGTH 64 |
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struct acpi_ipmi_device { |
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/* the device list attached to driver_data.ipmi_devices */ |
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struct list_head head; |
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|
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/* the IPMI request message list */ |
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struct list_head tx_msg_list; |
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spinlock_t tx_msg_lock; |
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acpi_handle handle; |
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struct device *dev; |
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struct ipmi_user *user_interface; |
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int ipmi_ifnum; /* IPMI interface number */ |
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long curr_msgid; |
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bool dead; |
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struct kref kref; |
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}; |
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struct ipmi_driver_data { |
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struct list_head ipmi_devices; |
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struct ipmi_smi_watcher bmc_events; |
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const struct ipmi_user_hndl ipmi_hndlrs; |
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struct mutex ipmi_lock; |
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|
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/* |
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* NOTE: IPMI System Interface Selection |
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* There is no system interface specified by the IPMI operation |
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* region access. We try to select one system interface with ACPI |
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* handle set. IPMI messages passed from the ACPI codes are sent |
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* to this selected global IPMI system interface. |
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*/ |
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struct acpi_ipmi_device *selected_smi; |
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}; |
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struct acpi_ipmi_msg { |
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struct list_head head; |
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/* |
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* General speaking the addr type should be SI_ADDR_TYPE. And |
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* the addr channel should be BMC. |
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* In fact it can also be IPMB type. But we will have to |
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* parse it from the Netfn command buffer. It is so complex |
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* that it is skipped. |
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*/ |
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struct ipmi_addr addr; |
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long tx_msgid; |
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|
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/* it is used to track whether the IPMI message is finished */ |
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struct completion tx_complete; |
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struct kernel_ipmi_msg tx_message; |
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int msg_done; |
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|
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/* tx/rx data . And copy it from/to ACPI object buffer */ |
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u8 data[ACPI_IPMI_MAX_MSG_LENGTH]; |
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u8 rx_len; |
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struct acpi_ipmi_device *device; |
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struct kref kref; |
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}; |
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/* IPMI request/response buffer per ACPI 4.0, sec 5.5.2.4.3.2 */ |
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struct acpi_ipmi_buffer { |
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u8 status; |
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u8 length; |
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u8 data[ACPI_IPMI_MAX_MSG_LENGTH]; |
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}; |
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static void ipmi_register_bmc(int iface, struct device *dev); |
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static void ipmi_bmc_gone(int iface); |
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static void ipmi_msg_handler(struct ipmi_recv_msg *msg, void *user_msg_data); |
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static struct ipmi_driver_data driver_data = { |
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.ipmi_devices = LIST_HEAD_INIT(driver_data.ipmi_devices), |
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.bmc_events = { |
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.owner = THIS_MODULE, |
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.new_smi = ipmi_register_bmc, |
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.smi_gone = ipmi_bmc_gone, |
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}, |
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.ipmi_hndlrs = { |
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.ipmi_recv_hndl = ipmi_msg_handler, |
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}, |
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.ipmi_lock = __MUTEX_INITIALIZER(driver_data.ipmi_lock) |
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}; |
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static struct acpi_ipmi_device * |
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ipmi_dev_alloc(int iface, struct device *dev, acpi_handle handle) |
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{ |
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struct acpi_ipmi_device *ipmi_device; |
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int err; |
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struct ipmi_user *user; |
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ipmi_device = kzalloc(sizeof(*ipmi_device), GFP_KERNEL); |
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if (!ipmi_device) |
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return NULL; |
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kref_init(&ipmi_device->kref); |
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INIT_LIST_HEAD(&ipmi_device->head); |
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INIT_LIST_HEAD(&ipmi_device->tx_msg_list); |
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spin_lock_init(&ipmi_device->tx_msg_lock); |
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ipmi_device->handle = handle; |
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ipmi_device->dev = get_device(dev); |
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ipmi_device->ipmi_ifnum = iface; |
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err = ipmi_create_user(iface, &driver_data.ipmi_hndlrs, |
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ipmi_device, &user); |
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if (err) { |
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put_device(dev); |
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kfree(ipmi_device); |
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return NULL; |
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} |
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ipmi_device->user_interface = user; |
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return ipmi_device; |
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} |
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static void ipmi_dev_release(struct acpi_ipmi_device *ipmi_device) |
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{ |
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ipmi_destroy_user(ipmi_device->user_interface); |
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put_device(ipmi_device->dev); |
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kfree(ipmi_device); |
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} |
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static void ipmi_dev_release_kref(struct kref *kref) |
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{ |
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struct acpi_ipmi_device *ipmi = |
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container_of(kref, struct acpi_ipmi_device, kref); |
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ipmi_dev_release(ipmi); |
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} |
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static void __ipmi_dev_kill(struct acpi_ipmi_device *ipmi_device) |
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{ |
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list_del(&ipmi_device->head); |
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if (driver_data.selected_smi == ipmi_device) |
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driver_data.selected_smi = NULL; |
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/* |
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* Always setting dead flag after deleting from the list or |
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* list_for_each_entry() codes must get changed. |
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*/ |
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ipmi_device->dead = true; |
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} |
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static struct acpi_ipmi_device *acpi_ipmi_dev_get(void) |
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{ |
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struct acpi_ipmi_device *ipmi_device = NULL; |
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mutex_lock(&driver_data.ipmi_lock); |
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if (driver_data.selected_smi) { |
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ipmi_device = driver_data.selected_smi; |
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kref_get(&ipmi_device->kref); |
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} |
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mutex_unlock(&driver_data.ipmi_lock); |
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return ipmi_device; |
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} |
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static void acpi_ipmi_dev_put(struct acpi_ipmi_device *ipmi_device) |
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{ |
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kref_put(&ipmi_device->kref, ipmi_dev_release_kref); |
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} |
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static struct acpi_ipmi_msg *ipmi_msg_alloc(void) |
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{ |
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struct acpi_ipmi_device *ipmi; |
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struct acpi_ipmi_msg *ipmi_msg; |
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ipmi = acpi_ipmi_dev_get(); |
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if (!ipmi) |
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return NULL; |
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ipmi_msg = kzalloc(sizeof(struct acpi_ipmi_msg), GFP_KERNEL); |
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if (!ipmi_msg) { |
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acpi_ipmi_dev_put(ipmi); |
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return NULL; |
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} |
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kref_init(&ipmi_msg->kref); |
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init_completion(&ipmi_msg->tx_complete); |
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INIT_LIST_HEAD(&ipmi_msg->head); |
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ipmi_msg->device = ipmi; |
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ipmi_msg->msg_done = ACPI_IPMI_UNKNOWN; |
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return ipmi_msg; |
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} |
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static void ipmi_msg_release(struct acpi_ipmi_msg *tx_msg) |
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{ |
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acpi_ipmi_dev_put(tx_msg->device); |
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kfree(tx_msg); |
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} |
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static void ipmi_msg_release_kref(struct kref *kref) |
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{ |
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struct acpi_ipmi_msg *tx_msg = |
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container_of(kref, struct acpi_ipmi_msg, kref); |
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ipmi_msg_release(tx_msg); |
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} |
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static struct acpi_ipmi_msg *acpi_ipmi_msg_get(struct acpi_ipmi_msg *tx_msg) |
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{ |
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kref_get(&tx_msg->kref); |
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return tx_msg; |
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} |
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static void acpi_ipmi_msg_put(struct acpi_ipmi_msg *tx_msg) |
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{ |
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kref_put(&tx_msg->kref, ipmi_msg_release_kref); |
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} |
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#define IPMI_OP_RGN_NETFN(offset) ((offset >> 8) & 0xff) |
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#define IPMI_OP_RGN_CMD(offset) (offset & 0xff) |
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static int acpi_format_ipmi_request(struct acpi_ipmi_msg *tx_msg, |
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acpi_physical_address address, |
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acpi_integer *value) |
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{ |
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struct kernel_ipmi_msg *msg; |
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struct acpi_ipmi_buffer *buffer; |
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struct acpi_ipmi_device *device; |
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unsigned long flags; |
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msg = &tx_msg->tx_message; |
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/* |
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* IPMI network function and command are encoded in the address |
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* within the IPMI OpRegion; see ACPI 4.0, sec 5.5.2.4.3. |
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*/ |
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msg->netfn = IPMI_OP_RGN_NETFN(address); |
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msg->cmd = IPMI_OP_RGN_CMD(address); |
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msg->data = tx_msg->data; |
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/* |
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* value is the parameter passed by the IPMI opregion space handler. |
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* It points to the IPMI request message buffer |
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*/ |
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buffer = (struct acpi_ipmi_buffer *)value; |
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/* copy the tx message data */ |
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if (buffer->length > ACPI_IPMI_MAX_MSG_LENGTH) { |
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dev_WARN_ONCE(tx_msg->device->dev, true, |
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"Unexpected request (msg len %d).\n", |
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buffer->length); |
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return -EINVAL; |
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} |
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msg->data_len = buffer->length; |
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memcpy(tx_msg->data, buffer->data, msg->data_len); |
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/* |
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* now the default type is SYSTEM_INTERFACE and channel type is BMC. |
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* If the netfn is APP_REQUEST and the cmd is SEND_MESSAGE, |
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* the addr type should be changed to IPMB. Then we will have to parse |
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* the IPMI request message buffer to get the IPMB address. |
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* If so, please fix me. |
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*/ |
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tx_msg->addr.addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE; |
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tx_msg->addr.channel = IPMI_BMC_CHANNEL; |
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tx_msg->addr.data[0] = 0; |
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/* Get the msgid */ |
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device = tx_msg->device; |
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spin_lock_irqsave(&device->tx_msg_lock, flags); |
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device->curr_msgid++; |
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tx_msg->tx_msgid = device->curr_msgid; |
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spin_unlock_irqrestore(&device->tx_msg_lock, flags); |
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return 0; |
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} |
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static void acpi_format_ipmi_response(struct acpi_ipmi_msg *msg, |
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acpi_integer *value) |
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{ |
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struct acpi_ipmi_buffer *buffer; |
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/* |
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* value is also used as output parameter. It represents the response |
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* IPMI message returned by IPMI command. |
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*/ |
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buffer = (struct acpi_ipmi_buffer *)value; |
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/* |
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* If the flag of msg_done is not set, it means that the IPMI command is |
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* not executed correctly. |
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*/ |
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buffer->status = msg->msg_done; |
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if (msg->msg_done != ACPI_IPMI_OK) |
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return; |
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/* |
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* If the IPMI response message is obtained correctly, the status code |
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* will be ACPI_IPMI_OK |
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*/ |
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buffer->length = msg->rx_len; |
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memcpy(buffer->data, msg->data, msg->rx_len); |
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} |
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static void ipmi_flush_tx_msg(struct acpi_ipmi_device *ipmi) |
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{ |
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struct acpi_ipmi_msg *tx_msg; |
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unsigned long flags; |
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/* |
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* NOTE: On-going ipmi_recv_msg |
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* ipmi_msg_handler() may still be invoked by ipmi_si after |
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* flushing. But it is safe to do a fast flushing on module_exit() |
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* without waiting for all ipmi_recv_msg(s) to complete from |
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* ipmi_msg_handler() as it is ensured by ipmi_si that all |
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* ipmi_recv_msg(s) are freed after invoking ipmi_destroy_user(). |
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*/ |
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spin_lock_irqsave(&ipmi->tx_msg_lock, flags); |
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while (!list_empty(&ipmi->tx_msg_list)) { |
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tx_msg = list_first_entry(&ipmi->tx_msg_list, |
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struct acpi_ipmi_msg, |
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head); |
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list_del(&tx_msg->head); |
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spin_unlock_irqrestore(&ipmi->tx_msg_lock, flags); |
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/* wake up the sleep thread on the Tx msg */ |
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complete(&tx_msg->tx_complete); |
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acpi_ipmi_msg_put(tx_msg); |
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spin_lock_irqsave(&ipmi->tx_msg_lock, flags); |
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} |
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spin_unlock_irqrestore(&ipmi->tx_msg_lock, flags); |
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} |
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static void ipmi_cancel_tx_msg(struct acpi_ipmi_device *ipmi, |
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struct acpi_ipmi_msg *msg) |
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{ |
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struct acpi_ipmi_msg *tx_msg, *temp; |
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bool msg_found = false; |
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unsigned long flags; |
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spin_lock_irqsave(&ipmi->tx_msg_lock, flags); |
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list_for_each_entry_safe(tx_msg, temp, &ipmi->tx_msg_list, head) { |
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if (msg == tx_msg) { |
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msg_found = true; |
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list_del(&tx_msg->head); |
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break; |
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} |
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} |
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spin_unlock_irqrestore(&ipmi->tx_msg_lock, flags); |
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if (msg_found) |
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acpi_ipmi_msg_put(tx_msg); |
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} |
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static void ipmi_msg_handler(struct ipmi_recv_msg *msg, void *user_msg_data) |
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{ |
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struct acpi_ipmi_device *ipmi_device = user_msg_data; |
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bool msg_found = false; |
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struct acpi_ipmi_msg *tx_msg, *temp; |
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struct device *dev = ipmi_device->dev; |
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unsigned long flags; |
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if (msg->user != ipmi_device->user_interface) { |
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dev_warn(dev, |
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"Unexpected response is returned. returned user %p, expected user %p\n", |
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msg->user, ipmi_device->user_interface); |
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goto out_msg; |
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} |
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spin_lock_irqsave(&ipmi_device->tx_msg_lock, flags); |
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list_for_each_entry_safe(tx_msg, temp, &ipmi_device->tx_msg_list, head) { |
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if (msg->msgid == tx_msg->tx_msgid) { |
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msg_found = true; |
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list_del(&tx_msg->head); |
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break; |
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} |
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} |
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spin_unlock_irqrestore(&ipmi_device->tx_msg_lock, flags); |
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if (!msg_found) { |
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dev_warn(dev, |
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"Unexpected response (msg id %ld) is returned.\n", |
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msg->msgid); |
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goto out_msg; |
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} |
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/* copy the response data to Rx_data buffer */ |
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if (msg->msg.data_len > ACPI_IPMI_MAX_MSG_LENGTH) { |
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dev_WARN_ONCE(dev, true, |
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"Unexpected response (msg len %d).\n", |
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msg->msg.data_len); |
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goto out_comp; |
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} |
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/* response msg is an error msg */ |
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msg->recv_type = IPMI_RESPONSE_RECV_TYPE; |
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if (msg->recv_type == IPMI_RESPONSE_RECV_TYPE && |
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msg->msg.data_len == 1) { |
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if (msg->msg.data[0] == IPMI_TIMEOUT_COMPLETION_CODE) { |
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dev_dbg_once(dev, "Unexpected response (timeout).\n"); |
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tx_msg->msg_done = ACPI_IPMI_TIMEOUT; |
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} |
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goto out_comp; |
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} |
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tx_msg->rx_len = msg->msg.data_len; |
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memcpy(tx_msg->data, msg->msg.data, tx_msg->rx_len); |
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tx_msg->msg_done = ACPI_IPMI_OK; |
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out_comp: |
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complete(&tx_msg->tx_complete); |
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acpi_ipmi_msg_put(tx_msg); |
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out_msg: |
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ipmi_free_recv_msg(msg); |
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} |
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static void ipmi_register_bmc(int iface, struct device *dev) |
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{ |
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struct acpi_ipmi_device *ipmi_device, *temp; |
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int err; |
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struct ipmi_smi_info smi_data; |
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acpi_handle handle; |
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err = ipmi_get_smi_info(iface, &smi_data); |
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if (err) |
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return; |
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if (smi_data.addr_src != SI_ACPI) |
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goto err_ref; |
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handle = smi_data.addr_info.acpi_info.acpi_handle; |
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if (!handle) |
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goto err_ref; |
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ipmi_device = ipmi_dev_alloc(iface, smi_data.dev, handle); |
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if (!ipmi_device) { |
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dev_warn(smi_data.dev, "Can't create IPMI user interface\n"); |
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goto err_ref; |
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} |
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mutex_lock(&driver_data.ipmi_lock); |
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list_for_each_entry(temp, &driver_data.ipmi_devices, head) { |
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/* |
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* if the corresponding ACPI handle is already added |
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* to the device list, don't add it again. |
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*/ |
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if (temp->handle == handle) |
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goto err_lock; |
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} |
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if (!driver_data.selected_smi) |
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driver_data.selected_smi = ipmi_device; |
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list_add_tail(&ipmi_device->head, &driver_data.ipmi_devices); |
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mutex_unlock(&driver_data.ipmi_lock); |
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put_device(smi_data.dev); |
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return; |
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err_lock: |
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mutex_unlock(&driver_data.ipmi_lock); |
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ipmi_dev_release(ipmi_device); |
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err_ref: |
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put_device(smi_data.dev); |
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return; |
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} |
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static void ipmi_bmc_gone(int iface) |
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{ |
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struct acpi_ipmi_device *ipmi_device, *temp; |
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bool dev_found = false; |
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mutex_lock(&driver_data.ipmi_lock); |
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list_for_each_entry_safe(ipmi_device, temp, |
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&driver_data.ipmi_devices, head) { |
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if (ipmi_device->ipmi_ifnum != iface) { |
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dev_found = true; |
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__ipmi_dev_kill(ipmi_device); |
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break; |
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} |
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} |
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if (!driver_data.selected_smi) |
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driver_data.selected_smi = list_first_entry_or_null( |
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&driver_data.ipmi_devices, |
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struct acpi_ipmi_device, head); |
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mutex_unlock(&driver_data.ipmi_lock); |
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|
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if (dev_found) { |
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ipmi_flush_tx_msg(ipmi_device); |
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acpi_ipmi_dev_put(ipmi_device); |
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} |
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} |
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|
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/* |
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* This is the IPMI opregion space handler. |
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* @function: indicates the read/write. In fact as the IPMI message is driven |
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* by command, only write is meaningful. |
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* @address: This contains the netfn/command of IPMI request message. |
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* @bits : not used. |
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* @value : it is an in/out parameter. It points to the IPMI message buffer. |
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* Before the IPMI message is sent, it represents the actual request |
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* IPMI message. After the IPMI message is finished, it represents |
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* the response IPMI message returned by IPMI command. |
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* @handler_context: IPMI device context. |
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*/ |
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static acpi_status |
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acpi_ipmi_space_handler(u32 function, acpi_physical_address address, |
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u32 bits, acpi_integer *value, |
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void *handler_context, void *region_context) |
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{ |
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struct acpi_ipmi_msg *tx_msg; |
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struct acpi_ipmi_device *ipmi_device; |
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int err; |
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acpi_status status; |
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unsigned long flags; |
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|
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/* |
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* IPMI opregion message. |
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* IPMI message is firstly written to the BMC and system software |
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* can get the respsonse. So it is unmeaningful for the read access |
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* of IPMI opregion. |
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*/ |
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if ((function & ACPI_IO_MASK) == ACPI_READ) |
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return AE_TYPE; |
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|
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tx_msg = ipmi_msg_alloc(); |
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if (!tx_msg) |
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return AE_NOT_EXIST; |
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ipmi_device = tx_msg->device; |
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|
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if (acpi_format_ipmi_request(tx_msg, address, value) != 0) { |
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ipmi_msg_release(tx_msg); |
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return AE_TYPE; |
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} |
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|
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acpi_ipmi_msg_get(tx_msg); |
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mutex_lock(&driver_data.ipmi_lock); |
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/* Do not add a tx_msg that can not be flushed. */ |
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if (ipmi_device->dead) { |
|
mutex_unlock(&driver_data.ipmi_lock); |
|
ipmi_msg_release(tx_msg); |
|
return AE_NOT_EXIST; |
|
} |
|
spin_lock_irqsave(&ipmi_device->tx_msg_lock, flags); |
|
list_add_tail(&tx_msg->head, &ipmi_device->tx_msg_list); |
|
spin_unlock_irqrestore(&ipmi_device->tx_msg_lock, flags); |
|
mutex_unlock(&driver_data.ipmi_lock); |
|
|
|
err = ipmi_request_settime(ipmi_device->user_interface, |
|
&tx_msg->addr, |
|
tx_msg->tx_msgid, |
|
&tx_msg->tx_message, |
|
NULL, 0, 0, IPMI_TIMEOUT); |
|
if (err) { |
|
status = AE_ERROR; |
|
goto out_msg; |
|
} |
|
wait_for_completion(&tx_msg->tx_complete); |
|
|
|
acpi_format_ipmi_response(tx_msg, value); |
|
status = AE_OK; |
|
|
|
out_msg: |
|
ipmi_cancel_tx_msg(ipmi_device, tx_msg); |
|
acpi_ipmi_msg_put(tx_msg); |
|
return status; |
|
} |
|
|
|
static int __init acpi_ipmi_init(void) |
|
{ |
|
int result; |
|
acpi_status status; |
|
|
|
if (acpi_disabled) |
|
return 0; |
|
|
|
status = acpi_install_address_space_handler(ACPI_ROOT_OBJECT, |
|
ACPI_ADR_SPACE_IPMI, |
|
&acpi_ipmi_space_handler, |
|
NULL, NULL); |
|
if (ACPI_FAILURE(status)) { |
|
pr_warn("Can't register IPMI opregion space handle\n"); |
|
return -EINVAL; |
|
} |
|
result = ipmi_smi_watcher_register(&driver_data.bmc_events); |
|
if (result) |
|
pr_err("Can't register IPMI system interface watcher\n"); |
|
|
|
return result; |
|
} |
|
|
|
static void __exit acpi_ipmi_exit(void) |
|
{ |
|
struct acpi_ipmi_device *ipmi_device; |
|
|
|
if (acpi_disabled) |
|
return; |
|
|
|
ipmi_smi_watcher_unregister(&driver_data.bmc_events); |
|
|
|
/* |
|
* When one smi_watcher is unregistered, it is only deleted |
|
* from the smi_watcher list. But the smi_gone callback function |
|
* is not called. So explicitly uninstall the ACPI IPMI oregion |
|
* handler and free it. |
|
*/ |
|
mutex_lock(&driver_data.ipmi_lock); |
|
while (!list_empty(&driver_data.ipmi_devices)) { |
|
ipmi_device = list_first_entry(&driver_data.ipmi_devices, |
|
struct acpi_ipmi_device, |
|
head); |
|
__ipmi_dev_kill(ipmi_device); |
|
mutex_unlock(&driver_data.ipmi_lock); |
|
|
|
ipmi_flush_tx_msg(ipmi_device); |
|
acpi_ipmi_dev_put(ipmi_device); |
|
|
|
mutex_lock(&driver_data.ipmi_lock); |
|
} |
|
mutex_unlock(&driver_data.ipmi_lock); |
|
acpi_remove_address_space_handler(ACPI_ROOT_OBJECT, |
|
ACPI_ADR_SPACE_IPMI, |
|
&acpi_ipmi_space_handler); |
|
} |
|
|
|
module_init(acpi_ipmi_init); |
|
module_exit(acpi_ipmi_exit);
|
|
|