@@ -65,7 +65,7 @@
#include <linux/string.h>
#include <linux/ctype.h>
#include <linux/pnp.h>
-
+#include <linux/ipmi.h>
#ifdef CONFIG_PPC_OF
#include <linux/of_device.h>
#include <linux/of_platform.h>
@@ -1808,6 +1808,463 @@ static __devinit void hardcode_find_bmc(void)
#include <linux/acpi.h>
+#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 30s */
+#define IPMI_TIMEOUT (30 * HZ)
+
+struct acpi_ipmi_device {
+ acpi_handle handle;
+ struct acpi_device *device;
+ /* the device list attached to driver_data.ipmi_devices */
+ struct list_head head;
+ ipmi_user_t user_interface;
+ struct mutex mutex_lock;
+ /* the IPMI request message list */
+ struct list_head tx_msg_list;
+ long curr_msgid;
+ /* IPMI flags */
+ unsigned long flags;
+ /* IPMI interface number */
+ int ipmi_ifnum;
+ struct smi_info *smi_info;
+};
+
+struct ipmi_driver_data {
+ int device_count;
+ struct list_head ipmi_devices;
+ struct ipmi_smi_watcher bmc_events;
+ struct ipmi_user_hndl ipmi_hndlrs;
+};
+
+struct acpi_ipmi_msg {
+ /* message list */
+ 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;
+ /* tx message id */
+ 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;
+ /* get the response data */
+ u8 rx_data[64];
+ /* the response length. The netfn & cmd is excluded. */
+ int rx_len;
+ struct acpi_ipmi_device *device;
+};
+
+/*
+ * IPMI request/response buffer.
+ * The length is 66 bytes.
+ */
+struct acpi_ipmi_buffer {
+ /* status code of a given IPMI command */
+ u8 status_code;
+ /* the length of the payload */
+ u8 length;
+ /*
+ * the payload. Before the operation is carried out, it represents the
+ * request message payload. After the operation is carried out, it
+ * stores the response message returned by IPMI command.
+ */
+ 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 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;
+
+ ipmi_msg = kzalloc(sizeof(struct acpi_ipmi_msg), GFP_KERNEL);
+ if (!ipmi_msg) {
+ printk(KERN_DEBUG "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;
+}
+
+static void acpi_format_ipmi_msg(struct acpi_ipmi_msg *tx_msg,
+ acpi_physical_address address,
+ acpi_integer *value)
+{
+ struct kernel_ipmi_msg *msg;
+ u8 temp_value;
+ struct acpi_ipmi_buffer *buffer;
+ struct acpi_ipmi_device *device;
+
+ msg = &tx_msg->tx_message;
+ /* get the netfn */
+ temp_value = (address >> 8) & 0xff;
+ msg->netfn = temp_value;
+ /* get the command */
+ temp_value = address & 0xff;
+ msg->cmd = temp_value;
+ 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.
+ */
+ tx_msg->addr.addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE;
+ tx_msg->addr.channel = IPMI_BMC_CHANNEL;
+ tx_msg->addr.data[0] = 0;
+
+ /*
+ * If the netfn is APP_REQUEST and the cmd is SEND_MESSAGE, we should
+ * parse the IPMI request message buffer to get the IPMB address.
+ * If so, please fix me.
+ */
+
+ /* Get the msgid */
+ device = tx_msg->device;
+ mutex_lock(&device->mutex_lock);
+ device->curr_msgid++;
+ tx_msg->tx_msgid = device->curr_msgid;
+ mutex_unlock(&device->mutex_lock);
+}
+
+static void acpi_format_ipmi_response(struct acpi_ipmi_msg *msg,
+ acpi_integer *value, int timeout)
+{
+ 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;
+ /* when timeout is zero, it means that the timeout happens */
+ if (!timeout) {
+ /* the status code is ACPI_IPMI_TIMEOUT */
+ buffer->status_code = ACPI_IPMI_TIMEOUT;
+ return;
+ }
+ /*
+ * If the flag of msg_done is not set, it means that the IPMI command
+ * is not executed correctly.
+ * The status code will be ACPI_IPMI_UNKNOWN.
+ */
+ if (!msg->msg_done) {
+ buffer->status_code = ACPI_IPMI_UNKNOWN;
+ return;
+ }
+ /*
+ * If the IPMI response message is obtained correctly, the status code
+ * will be ACPI_IPMI_OK
+ */
+ buffer->status_code = ACPI_IPMI_OK;
+ buffer->length = msg->rx_len;
+ memcpy(buffer->data, msg->rx_data, msg->rx_len);
+}
+
+static void ipmi_destroy_tx_msg(struct acpi_ipmi_device *ipmi)
+{
+ struct acpi_ipmi_msg *tx_msg = NULL, *temp;
+ int count = 20;
+
+ 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 20 ticks 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))
+ printk(KERN_DEBUG "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;
+
+ if (msg->user != ipmi_device->user_interface) {
+ printk(KERN_DEBUG "Incorrect IPMI user\n");
+ ipmi_free_recv_msg(msg);
+ return;
+ }
+ mutex_lock(&ipmi_device->mutex_lock);
+ list_for_each_entry(tx_msg, &ipmi_device->tx_msg_list, head) {
+ if (msg->msgid == tx_msg->tx_msgid) {
+ /* find the message id */
+ msg_found = 1;
+ break;
+ }
+ }
+
+ mutex_unlock(&ipmi_device->mutex_lock);
+ if (!msg_found) {
+ /* no matched msg is found . But we should free it */
+ ipmi_free_recv_msg(msg);
+ printk(KERN_DEBUG "Incorrect MSG is found \n");
+ return;
+ }
+
+ if (msg->msg.data_len > 1) {
+ /* 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 acpi_device *device;
+ ipmi_user_t user;
+ int err;
+
+ if (list_empty(&driver_data.ipmi_devices))
+ return;
+
+ list_for_each_entry_safe(ipmi_device, temp,
+ &driver_data.ipmi_devices, head) {
+ device = ipmi_device->device;
+ if (ipmi_device->user_interface) {
+ /*
+ * Only one user interface is allowed to be registered
+ * for one IPMI device.
+ * If we already create the user interface for
+ * one IPMI device, skip it
+ */
+ continue;
+ }
+ if (dev == &device->dev) {
+ /*
+ * If the dev is identical to the ACPI device,
+ * create the user interface.
+ */
+ err = ipmi_create_user(iface, &driver_data.ipmi_hndlrs,
+ ipmi_device, &user);
+ if (err == 0) {
+ ipmi_device->user_interface = user;
+ ipmi_device->ipmi_ifnum = iface;
+ }
+ }
+ }
+}
+
+static void ipmi_bmc_gone(int iface)
+{
+ struct acpi_ipmi_device *ipmi_device, *temp;
+
+ if (list_empty(&driver_data.ipmi_devices))
+ return;
+
+ list_for_each_entry_safe(ipmi_device, temp,
+ &driver_data.ipmi_devices, head) {
+ if (ipmi_device->user_interface &&
+ (ipmi_device->ipmi_ifnum == iface)) {
+ ipmi_destroy_user(ipmi_device->user_interface);
+ ipmi_device->user_interface = NULL;
+ ipmi_destroy_tx_msg(ipmi_device);
+ }
+ }
+}
+/* --------------------------------------------------------------------------
+ * 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 = NULL;
+ struct acpi_ipmi_device *ipmi_device =
+ (struct acpi_ipmi_device *) handler_context;
+ int err;
+ 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 IPMI read
+ * access.
+ */
+ if ((function & ACPI_IO_MASK) == ACPI_READ) {
+ /* Read function is not supported. AE_TYPE is returned. */
+ 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->mutex_lock);
+ list_add_tail(&tx_msg->head, &ipmi_device->tx_msg_list);
+ mutex_unlock(&ipmi_device->mutex_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;
+ }
+ err = wait_for_completion_timeout(&tx_msg->tx_complete, IPMI_TIMEOUT);
+
+ acpi_format_ipmi_response(tx_msg, value, err);
+ status = AE_OK;
+
+end_label:
+ mutex_lock(&ipmi_device->mutex_lock);
+ list_del(&tx_msg->head);
+ mutex_unlock(&ipmi_device->mutex_lock);
+ kfree(tx_msg);
+ return status;
+}
+
+static void ipmi_remove_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_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)) {
+ printk(KERN_DEBUG "Can't register IPMI opregion %s\n",
+ acpi_device_bid(ipmi->device));
+ return -EINVAL;
+ }
+
+ test_bit(IPMI_FLAGS_HANDLER_INSTALL, &ipmi->flags);
+
+ return 0;
+}
+
+static void acpi_register_ipmi_handler(struct acpi_ipmi_device *ipmi_device)
+{
+ if (list_empty(&driver_data.ipmi_devices)) {
+ /*
+ * when we try to register the first IPI0001 device, register
+ * the smi_watcher.
+ */
+ ipmi_smi_watcher_register(&driver_data.bmc_events);
+ }
+
+ mutex_init(&ipmi_device->mutex_lock);
+ INIT_LIST_HEAD(&ipmi_device->tx_msg_list);
+
+ if (ipmi_install_handler(ipmi_device)) {
+ /*
+ * can't register the IPMI opregion. We will print
+ * some debug info and continue to register ipmi
+ * opregion for next device.
+ */
+ printk(KERN_DEBUG "Can't register IPMI opregion %s\n",
+ acpi_device_bid(ipmi_device->device));
+ }
+ list_add(&ipmi_device->head, &driver_data.ipmi_devices);
+}
+
+static void acpi_remove_ipmi_handler(struct acpi_ipmi_device *ipmi_device)
+{
+ if (!ipmi_device)
+ return;
+
+ if (ipmi_device->user_interface) {
+ /*
+ * If the IPMI user interface is created, it
+ * should be destroyed.
+ */
+ ipmi_destroy_user(ipmi_device->user_interface);
+ ipmi_device->user_interface = NULL;
+ }
+ list_del(&ipmi_device->head);
+
+ if (!list_empty(&ipmi_device->tx_msg_list))
+ ipmi_destroy_tx_msg(ipmi_device);
+
+ ipmi_remove_handler(ipmi_device);
+ if (list_empty(&driver_data.ipmi_devices)) {
+ /*
+ * when no IPI0001 device is in the list, uninstall the
+ * smi_watcher.
+ */
+ ipmi_smi_watcher_unregister(&driver_data.bmc_events);
+ }
+}
+
/*
* Once we get an ACPI failure, we don't try any more, because we go
* through the tables sequentially. Once we don't find a table, there
@@ -2033,6 +2490,8 @@ static int __devinit ipmi_pnp_probe(struct pnp_dev *dev,
acpi_handle handle;
acpi_status status;
unsigned long long tmp;
+ int ret;
+ struct acpi_ipmi_device *p_ipmi;
acpi_dev = pnp_acpi_device(dev);
if (!acpi_dev)
@@ -2042,6 +2501,13 @@ static int __devinit ipmi_pnp_probe(struct pnp_dev *dev,
if (!info)
return -ENOMEM;
+ p_ipmi = kzalloc(sizeof(*p_ipmi), GFP_KERNEL);
+ if (!p_ipmi) {
+ printk(KERN_ERR "Can't allocate memory for IPMI device\n");
+ kfree(info);
+ return -ENOMEM;
+ }
+
info->addr_source = "ACPI";
handle = acpi_dev->handle;
@@ -2094,20 +2560,39 @@ static int __devinit ipmi_pnp_probe(struct pnp_dev *dev,
}
info->dev = &acpi_dev->dev;
- pnp_set_drvdata(dev, info);
+ p_ipmi->smi_info = info;
+ pnp_set_drvdata(dev, p_ipmi);
- return try_smi_init(info);
+ p_ipmi->device = acpi_dev;
+ p_ipmi->handle = handle;
+ p_ipmi->ipmi_ifnum = -1;
+ acpi_register_ipmi_handler(p_ipmi);
+
+ ret = try_smi_init(info);
+ if (!ret)
+ return ret;
+ else
+ acpi_remove_ipmi_handler(p_ipmi);
err_free:
+ pnp_set_drvdata(dev, NULL);
+ kfree(p_ipmi);
kfree(info);
return -EINVAL;
}
static void __devexit ipmi_pnp_remove(struct pnp_dev *dev)
{
- struct smi_info *info = pnp_get_drvdata(dev);
+ struct acpi_ipmi_device *p_ipmi;
+ struct smi_info *info;
+
+ p_ipmi = pnp_get_drvdata(dev);
+ info = p_ipmi->smi_info;
cleanup_one_si(info);
+ acpi_remove_ipmi_handler(p_ipmi);
+ pnp_set_drvdata(dev, NULL);
+ kfree(p_ipmi);
}
static const struct pnp_device_id pnp_dev_table[] = {