--- /dev/null
+/*
+ * acpi_ipmi.c - ACPI IPMI opregion
+ *
+ * Copyright (C) 2010 Intel Corporation
+ * Copyright (C) 2010 Zhao Yakui <yakui.zhao@intel.com>
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or (at
+ * your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/types.h>
+#include <linux/delay.h>
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
+#include <linux/interrupt.h>
+#include <linux/list.h>
+#include <linux/spinlock.h>
+#include <linux/io.h>
+#include <acpi/acpi_bus.h>
+#include <acpi/acpi_drivers.h>
+#include <linux/ipmi.h>
+#include <linux/device.h>
+#include <linux/pnp.h>
+
+MODULE_AUTHOR("Zhao Yakui");
+MODULE_DESCRIPTION("ACPI IPMI Opregion driver");
+MODULE_LICENSE("GPL");
+
+#define IPMI_FLAGS_HANDLER_INSTALL 0
+
+#define ACPI_IPMI_OK 0
+#define ACPI_IPMI_TIMEOUT 0x10
+#define ACPI_IPMI_UNKNOWN 0x07
+/* the IPMI timeout is 5s */
+#define IPMI_TIMEOUT (5 * HZ)
+
+struct acpi_ipmi_device {
+ /* the device list attached to driver_data.ipmi_devices */
+ struct list_head head;
+ /* the IPMI request message list */
+ struct list_head tx_msg_list;
+ struct mutex tx_msg_lock;
+ acpi_handle handle;
+ struct pnp_dev *pnp_dev;
+ ipmi_user_t user_interface;
+ int ipmi_ifnum; /* IPMI interface number */
+ long curr_msgid;
+ unsigned long flags;
+ struct ipmi_smi_info smi_data;
+};
+
+struct ipmi_driver_data {
+ struct list_head ipmi_devices;
+ struct ipmi_smi_watcher bmc_events;
+ struct ipmi_user_hndl ipmi_hndlrs;
+ struct mutex ipmi_lock;
+};
+
+struct acpi_ipmi_msg {
+ struct list_head head;
+ /*
+ * General speaking the addr type should be SI_ADDR_TYPE. And
+ * the addr channel should be BMC.
+ * In fact it can also be IPMB type. But we will have to
+ * parse it from the Netfn command buffer. It is so complex
+ * that it is skipped.
+ */
+ struct ipmi_addr addr;
+ long tx_msgid;
+ /* it is used to track whether the IPMI message is finished */
+ struct completion tx_complete;
+ struct kernel_ipmi_msg tx_message;
+ int msg_done;
+ /* tx data . And copy it from ACPI object buffer */
+ u8 tx_data[64];
+ int tx_len;
+ u8 rx_data[64];
+ int rx_len;
+ struct acpi_ipmi_device *device;
+};
+
+/* IPMI request/response buffer per ACPI 4.0, sec 5.5.2.4.3.2 */
+struct acpi_ipmi_buffer {
+ u8 status;
+ u8 length;
+ u8 data[64];
+};
+
+static void ipmi_register_bmc(int iface, struct device *dev);
+static void ipmi_bmc_gone(int iface);
+static void ipmi_msg_handler(struct ipmi_recv_msg *msg, void *user_msg_data);
+static void acpi_add_ipmi_device(struct acpi_ipmi_device *ipmi_device);
+static void acpi_remove_ipmi_device(struct acpi_ipmi_device *ipmi_device);
+
+static struct ipmi_driver_data driver_data = {
+ .ipmi_devices = LIST_HEAD_INIT(driver_data.ipmi_devices),
+ .bmc_events = {
+ .owner = THIS_MODULE,
+ .new_smi = ipmi_register_bmc,
+ .smi_gone = ipmi_bmc_gone,
+ },
+ .ipmi_hndlrs = {
+ .ipmi_recv_hndl = ipmi_msg_handler,
+ },
+};
+
+static struct acpi_ipmi_msg *acpi_alloc_ipmi_msg(struct acpi_ipmi_device *ipmi)
+{
+ struct acpi_ipmi_msg *ipmi_msg;
+ struct pnp_dev *pnp_dev = ipmi->pnp_dev;
+
+ ipmi_msg = kzalloc(sizeof(struct acpi_ipmi_msg), GFP_KERNEL);
+ if (!ipmi_msg) {
+ dev_warn(&pnp_dev->dev, "Can't allocate memory for ipmi_msg\n");
+ return NULL;
+ }
+ init_completion(&ipmi_msg->tx_complete);
+ INIT_LIST_HEAD(&ipmi_msg->head);
+ ipmi_msg->device = ipmi;
+ return ipmi_msg;
+}
+
+#define IPMI_OP_RGN_NETFN(offset) ((offset >> 8) & 0xff)
+#define IPMI_OP_RGN_CMD(offset) (offset & 0xff)
+static void acpi_format_ipmi_msg(struct acpi_ipmi_msg *tx_msg,
+ acpi_physical_address address,
+ acpi_integer *value)
+{
+ struct kernel_ipmi_msg *msg;
+ struct acpi_ipmi_buffer *buffer;
+ struct acpi_ipmi_device *device;
+
+ msg = &tx_msg->tx_message;
+ /*
+ * IPMI network function and command are encoded in the address
+ * within the IPMI OpRegion; see ACPI 4.0, sec 5.5.2.4.3.
+ */
+ msg->netfn = IPMI_OP_RGN_NETFN(address);
+ msg->cmd = IPMI_OP_RGN_CMD(address);
+ msg->data = tx_msg->tx_data;
+ /*
+ * value is the parameter passed by the IPMI opregion space handler.
+ * It points to the IPMI request message buffer
+ */
+ buffer = (struct acpi_ipmi_buffer *)value;
+ /* copy the tx message data */
+ msg->data_len = buffer->length;
+ memcpy(tx_msg->tx_data, buffer->data, msg->data_len);
+ /*
+ * now the default type is SYSTEM_INTERFACE and channel type is BMC.
+ * If the netfn is APP_REQUEST and the cmd is SEND_MESSAGE,
+ * the addr type should be changed to IPMB. Then we will have to parse
+ * the IPMI request message buffer to get the IPMB address.
+ * If so, please fix me.
+ */
+ tx_msg->addr.addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE;
+ tx_msg->addr.channel = IPMI_BMC_CHANNEL;
+ tx_msg->addr.data[0] = 0;
+
+ /* Get the msgid */
+ device = tx_msg->device;
+ mutex_lock(&device->tx_msg_lock);
+ device->curr_msgid++;
+ tx_msg->tx_msgid = device->curr_msgid;
+ mutex_unlock(&device->tx_msg_lock);
+}
+
+static void acpi_format_ipmi_response(struct acpi_ipmi_msg *msg,
+ acpi_integer *value, int rem_time)
+{
+ struct acpi_ipmi_buffer *buffer;
+
+ /*
+ * value is also used as output parameter. It represents the response
+ * IPMI message returned by IPMI command.
+ */
+ buffer = (struct acpi_ipmi_buffer *)value;
+ if (!rem_time && !msg->msg_done) {
+ buffer->status = ACPI_IPMI_TIMEOUT;
+ return;
+ }
+ /*
+ * If the flag of msg_done is not set or the recv length is zero, it
+ * means that the IPMI command is not executed correctly.
+ * The status code will be ACPI_IPMI_UNKNOWN.
+ */
+ if (!msg->msg_done || !msg->rx_len) {
+ buffer->status = ACPI_IPMI_UNKNOWN;
+ return;
+ }
+ /*
+ * If the IPMI response message is obtained correctly, the status code
+ * will be ACPI_IPMI_OK
+ */
+ buffer->status = ACPI_IPMI_OK;
+ buffer->length = msg->rx_len;
+ memcpy(buffer->data, msg->rx_data, msg->rx_len);
+}
+
+static void ipmi_flush_tx_msg(struct acpi_ipmi_device *ipmi)
+{
+ struct acpi_ipmi_msg *tx_msg, *temp;
+ int count = HZ / 10;
+ struct pnp_dev *pnp_dev = ipmi->pnp_dev;
+
+ list_for_each_entry_safe(tx_msg, temp, &ipmi->tx_msg_list, head) {
+ /* wake up the sleep thread on the Tx msg */
+ complete(&tx_msg->tx_complete);
+ }
+
+ /* wait for about 100ms to flush the tx message list */
+ while (count--) {
+ if (list_empty(&ipmi->tx_msg_list))
+ break;
+ schedule_timeout(1);
+ }
+ if (!list_empty(&ipmi->tx_msg_list))
+ dev_warn(&pnp_dev->dev, "tx msg list is not NULL\n");
+}
+
+static void ipmi_msg_handler(struct ipmi_recv_msg *msg, void *user_msg_data)
+{
+ struct acpi_ipmi_device *ipmi_device = user_msg_data;
+ int msg_found = 0;
+ struct acpi_ipmi_msg *tx_msg;
+ struct pnp_dev *pnp_dev = ipmi_device->pnp_dev;
+
+ if (msg->user != ipmi_device->user_interface) {
+ dev_warn(&pnp_dev->dev, "Unexpected response is returned. "
+ "returned user %p, expected user %p\n",
+ msg->user, ipmi_device->user_interface);
+ ipmi_free_recv_msg(msg);
+ return;
+ }
+ mutex_lock(&ipmi_device->tx_msg_lock);
+ list_for_each_entry(tx_msg, &ipmi_device->tx_msg_list, head) {
+ if (msg->msgid == tx_msg->tx_msgid) {
+ msg_found = 1;
+ break;
+ }
+ }
+
+ mutex_unlock(&ipmi_device->tx_msg_lock);
+ if (!msg_found) {
+ dev_warn(&pnp_dev->dev, "Unexpected response (msg id %ld) is "
+ "returned.\n", msg->msgid);
+ ipmi_free_recv_msg(msg);
+ return;
+ }
+
+ if (msg->msg.data_len) {
+ /* copy the response data to Rx_data buffer */
+ memcpy(tx_msg->rx_data, msg->msg_data, msg->msg.data_len);
+ tx_msg->rx_len = msg->msg.data_len;
+ tx_msg->msg_done = 1;
+ }
+ complete(&tx_msg->tx_complete);
+ ipmi_free_recv_msg(msg);
+};
+
+static void ipmi_register_bmc(int iface, struct device *dev)
+{
+ struct acpi_ipmi_device *ipmi_device, *temp;
+ struct pnp_dev *pnp_dev;
+ ipmi_user_t user;
+ int err;
+ struct ipmi_smi_info smi_data;
+ acpi_handle handle;
+
+ err = ipmi_get_smi_info(iface, &smi_data);
+
+ if (err)
+ return;
+
+ if (smi_data.addr_src != SI_ACPI) {
+ put_device(smi_data.dev);
+ return;
+ }
+
+ handle = smi_data.addr_info.acpi_info.acpi_handle;
+
+ mutex_lock(&driver_data.ipmi_lock);
+ list_for_each_entry(temp, &driver_data.ipmi_devices, head) {
+ /*
+ * if the corresponding ACPI handle is already added
+ * to the device list, don't add it again.
+ */
+ if (temp->handle == handle)
+ goto out;
+ }
+
+ ipmi_device = kzalloc(sizeof(*ipmi_device), GFP_KERNEL);
+
+ if (!ipmi_device)
+ goto out;
+
+ pnp_dev = to_pnp_dev(smi_data.dev);
+ ipmi_device->handle = handle;
+ ipmi_device->pnp_dev = pnp_dev;
+
+ err = ipmi_create_user(iface, &driver_data.ipmi_hndlrs,
+ ipmi_device, &user);
+ if (err) {
+ dev_warn(&pnp_dev->dev, "Can't create IPMI user interface\n");
+ kfree(ipmi_device);
+ goto out;
+ }
+ acpi_add_ipmi_device(ipmi_device);
+ ipmi_device->user_interface = user;
+ ipmi_device->ipmi_ifnum = iface;
+ mutex_unlock(&driver_data.ipmi_lock);
+ memcpy(&ipmi_device->smi_data, &smi_data, sizeof(struct ipmi_smi_info));
+ return;
+
+out:
+ mutex_unlock(&driver_data.ipmi_lock);
+ put_device(smi_data.dev);
+ return;
+}
+
+static void ipmi_bmc_gone(int iface)
+{
+ struct acpi_ipmi_device *ipmi_device, *temp;
+
+ mutex_lock(&driver_data.ipmi_lock);
+ list_for_each_entry_safe(ipmi_device, temp,
+ &driver_data.ipmi_devices, head) {
+ if (ipmi_device->ipmi_ifnum != iface)
+ continue;
+
+ acpi_remove_ipmi_device(ipmi_device);
+ put_device(ipmi_device->smi_data.dev);
+ kfree(ipmi_device);
+ break;
+ }
+ mutex_unlock(&driver_data.ipmi_lock);
+}
+/* --------------------------------------------------------------------------
+ * Address Space Management
+ * -------------------------------------------------------------------------- */
+/*
+ * This is the IPMI opregion space handler.
+ * @function: indicates the read/write. In fact as the IPMI message is driven
+ * by command, only write is meaningful.
+ * @address: This contains the netfn/command of IPMI request message.
+ * @bits : not used.
+ * @value : it is an in/out parameter. It points to the IPMI message buffer.
+ * Before the IPMI message is sent, it represents the actual request
+ * IPMI message. After the IPMI message is finished, it represents
+ * the response IPMI message returned by IPMI command.
+ * @handler_context: IPMI device context.
+ */
+
+static acpi_status
+acpi_ipmi_space_handler(u32 function, acpi_physical_address address,
+ u32 bits, acpi_integer *value,
+ void *handler_context, void *region_context)
+{
+ struct acpi_ipmi_msg *tx_msg;
+ struct acpi_ipmi_device *ipmi_device = handler_context;
+ int err, rem_time;
+ acpi_status status;
+ /*
+ * IPMI opregion message.
+ * IPMI message is firstly written to the BMC and system software
+ * can get the respsonse. So it is unmeaningful for the read access
+ * of IPMI opregion.
+ */
+ if ((function & ACPI_IO_MASK) == ACPI_READ)
+ return AE_TYPE;
+
+ if (!ipmi_device->user_interface)
+ return AE_NOT_EXIST;
+
+ tx_msg = acpi_alloc_ipmi_msg(ipmi_device);
+ if (!tx_msg)
+ return AE_NO_MEMORY;
+
+ acpi_format_ipmi_msg(tx_msg, address, value);
+ mutex_lock(&ipmi_device->tx_msg_lock);
+ list_add_tail(&tx_msg->head, &ipmi_device->tx_msg_list);
+ mutex_unlock(&ipmi_device->tx_msg_lock);
+ err = ipmi_request_settime(ipmi_device->user_interface,
+ &tx_msg->addr,
+ tx_msg->tx_msgid,
+ &tx_msg->tx_message,
+ NULL, 0, 0, 0);
+ if (err) {
+ status = AE_ERROR;
+ goto end_label;
+ }
+ rem_time = wait_for_completion_timeout(&tx_msg->tx_complete,
+ IPMI_TIMEOUT);
+ acpi_format_ipmi_response(tx_msg, value, rem_time);
+ status = AE_OK;
+
+end_label:
+ mutex_lock(&ipmi_device->tx_msg_lock);
+ list_del(&tx_msg->head);
+ mutex_unlock(&ipmi_device->tx_msg_lock);
+ kfree(tx_msg);
+ return status;
+}
+
+static void ipmi_remove_space_handler(struct acpi_ipmi_device *ipmi)
+{
+ if (!test_bit(IPMI_FLAGS_HANDLER_INSTALL, &ipmi->flags))
+ return;
+
+ acpi_remove_address_space_handler(ipmi->handle,
+ ACPI_ADR_SPACE_IPMI, &acpi_ipmi_space_handler);
+
+ clear_bit(IPMI_FLAGS_HANDLER_INSTALL, &ipmi->flags);
+}
+
+static int ipmi_install_space_handler(struct acpi_ipmi_device *ipmi)
+{
+ acpi_status status;
+
+ if (test_bit(IPMI_FLAGS_HANDLER_INSTALL, &ipmi->flags))
+ return 0;
+
+ status = acpi_install_address_space_handler(ipmi->handle,
+ ACPI_ADR_SPACE_IPMI,
+ &acpi_ipmi_space_handler,
+ NULL, ipmi);
+ if (ACPI_FAILURE(status)) {
+ struct pnp_dev *pnp_dev = ipmi->pnp_dev;
+ dev_warn(&pnp_dev->dev, "Can't register IPMI opregion space "
+ "handle\n");
+ return -EINVAL;
+ }
+ set_bit(IPMI_FLAGS_HANDLER_INSTALL, &ipmi->flags);
+ return 0;
+}
+
+static void acpi_add_ipmi_device(struct acpi_ipmi_device *ipmi_device)
+{
+
+ INIT_LIST_HEAD(&ipmi_device->head);
+
+ mutex_init(&ipmi_device->tx_msg_lock);
+ INIT_LIST_HEAD(&ipmi_device->tx_msg_list);
+ ipmi_install_space_handler(ipmi_device);
+
+ list_add_tail(&ipmi_device->head, &driver_data.ipmi_devices);
+}
+
+static void acpi_remove_ipmi_device(struct acpi_ipmi_device *ipmi_device)
+{
+ /*
+ * If the IPMI user interface is created, it should be
+ * destroyed.
+ */
+ if (ipmi_device->user_interface) {
+ ipmi_destroy_user(ipmi_device->user_interface);
+ ipmi_device->user_interface = NULL;
+ }
+ /* flush the Tx_msg list */
+ if (!list_empty(&ipmi_device->tx_msg_list))
+ ipmi_flush_tx_msg(ipmi_device);
+
+ list_del(&ipmi_device->head);
+ ipmi_remove_space_handler(ipmi_device);
+}
+
+static int __init acpi_ipmi_init(void)
+{
+ int result = 0;
+
+ if (acpi_disabled)
+ return result;
+
+ mutex_init(&driver_data.ipmi_lock);
+
+ result = ipmi_smi_watcher_register(&driver_data.bmc_events);
+
+ return result;
+}
+
+static void __exit acpi_ipmi_exit(void)
+{
+ struct acpi_ipmi_device *ipmi_device, *temp;
+
+ 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);
+ list_for_each_entry_safe(ipmi_device, temp,
+ &driver_data.ipmi_devices, head) {
+ acpi_remove_ipmi_device(ipmi_device);
+ put_device(ipmi_device->smi_data.dev);
+ kfree(ipmi_device);
+ }
+ mutex_unlock(&driver_data.ipmi_lock);
+}
+
+module_init(acpi_ipmi_init);
+module_exit(acpi_ipmi_exit);
projects / mv-sheeva.git / blobdiff