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Diffstat (limited to 'drivers/acpi')
-rw-r--r--drivers/acpi/acpi_ipmi.c105
1 files changed, 65 insertions, 40 deletions
diff --git a/drivers/acpi/acpi_ipmi.c b/drivers/acpi/acpi_ipmi.c
index 9d187fdbfd96..ac0f52f6df2b 100644
--- a/drivers/acpi/acpi_ipmi.c
+++ b/drivers/acpi/acpi_ipmi.c
@@ -33,7 +33,6 @@ MODULE_AUTHOR("Zhao Yakui");
MODULE_DESCRIPTION("ACPI IPMI Opregion driver");
MODULE_LICENSE("GPL");
-
#define ACPI_IPMI_OK 0
#define ACPI_IPMI_TIMEOUT 0x10
#define ACPI_IPMI_UNKNOWN 0x07
@@ -44,12 +43,14 @@ MODULE_LICENSE("GPL");
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;
- spinlock_t tx_msg_lock;
+
+ spinlock_t tx_msg_lock;
acpi_handle handle;
struct device *dev;
- ipmi_user_t user_interface;
+ ipmi_user_t user_interface;
int ipmi_ifnum; /* IPMI interface number */
long curr_msgid;
bool dead;
@@ -57,10 +58,11 @@ struct acpi_ipmi_device {
};
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 list_head ipmi_devices;
+ struct ipmi_smi_watcher bmc_events;
+ struct ipmi_user_hndl ipmi_hndlrs;
+ struct mutex ipmi_lock;
+
/*
* NOTE: IPMI System Interface Selection
* There is no system interface specified by the IPMI operation
@@ -73,6 +75,7 @@ struct ipmi_driver_data {
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.
@@ -82,15 +85,19 @@ struct acpi_ipmi_msg {
*/
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;
+ int msg_done;
+
/* tx/rx data . And copy it from/to ACPI object buffer */
- u8 data[ACPI_IPMI_MAX_MSG_LENGTH];
- u8 rx_len;
+ u8 data[ACPI_IPMI_MAX_MSG_LENGTH];
+ u8 rx_len;
+
struct acpi_ipmi_device *device;
- struct kref kref;
+ struct kref kref;
};
/* IPMI request/response buffer per ACPI 4.0, sec 5.5.2.4.3.2 */
@@ -132,7 +139,6 @@ ipmi_dev_alloc(int iface, struct device *dev, acpi_handle handle)
INIT_LIST_HEAD(&ipmi_device->head);
INIT_LIST_HEAD(&ipmi_device->tx_msg_list);
spin_lock_init(&ipmi_device->tx_msg_lock);
-
ipmi_device->handle = handle;
ipmi_device->dev = get_device(dev);
ipmi_device->ipmi_ifnum = iface;
@@ -169,6 +175,7 @@ static void __ipmi_dev_kill(struct acpi_ipmi_device *ipmi_device)
list_del(&ipmi_device->head);
if (driver_data.selected_smi == ipmi_device)
driver_data.selected_smi = NULL;
+
/*
* Always setting dead flag after deleting from the list or
* list_for_each_entry() codes must get changed.
@@ -203,16 +210,19 @@ static struct acpi_ipmi_msg *ipmi_msg_alloc(void)
ipmi = acpi_ipmi_dev_get();
if (!ipmi)
return NULL;
+
ipmi_msg = kzalloc(sizeof(struct acpi_ipmi_msg), GFP_KERNEL);
if (!ipmi_msg) {
acpi_ipmi_dev_put(ipmi);
return NULL;
}
+
kref_init(&ipmi_msg->kref);
init_completion(&ipmi_msg->tx_complete);
INIT_LIST_HEAD(&ipmi_msg->head);
ipmi_msg->device = ipmi;
ipmi_msg->msg_done = ACPI_IPMI_UNKNOWN;
+
return ipmi_msg;
}
@@ -242,11 +252,11 @@ static void acpi_ipmi_msg_put(struct acpi_ipmi_msg *tx_msg)
kref_put(&tx_msg->kref, ipmi_msg_release_kref);
}
-#define IPMI_OP_RGN_NETFN(offset) ((offset >> 8) & 0xff)
-#define IPMI_OP_RGN_CMD(offset) (offset & 0xff)
+#define IPMI_OP_RGN_NETFN(offset) ((offset >> 8) & 0xff)
+#define IPMI_OP_RGN_CMD(offset) (offset & 0xff)
static int acpi_format_ipmi_request(struct acpi_ipmi_msg *tx_msg,
- acpi_physical_address address,
- acpi_integer *value)
+ acpi_physical_address address,
+ acpi_integer *value)
{
struct kernel_ipmi_msg *msg;
struct acpi_ipmi_buffer *buffer;
@@ -254,6 +264,7 @@ static int acpi_format_ipmi_request(struct acpi_ipmi_msg *tx_msg,
unsigned long flags;
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.
@@ -261,11 +272,13 @@ static int acpi_format_ipmi_request(struct acpi_ipmi_msg *tx_msg,
msg->netfn = IPMI_OP_RGN_NETFN(address);
msg->cmd = IPMI_OP_RGN_CMD(address);
msg->data = tx_msg->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 */
if (buffer->length > ACPI_IPMI_MAX_MSG_LENGTH) {
dev_WARN_ONCE(tx_msg->device->dev, true,
@@ -275,6 +288,7 @@ static int acpi_format_ipmi_request(struct acpi_ipmi_msg *tx_msg,
}
msg->data_len = buffer->length;
memcpy(tx_msg->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,
@@ -288,15 +302,17 @@ static int acpi_format_ipmi_request(struct acpi_ipmi_msg *tx_msg,
/* Get the msgid */
device = tx_msg->device;
+
spin_lock_irqsave(&device->tx_msg_lock, flags);
device->curr_msgid++;
tx_msg->tx_msgid = device->curr_msgid;
spin_unlock_irqrestore(&device->tx_msg_lock, flags);
+
return 0;
}
static void acpi_format_ipmi_response(struct acpi_ipmi_msg *msg,
- acpi_integer *value)
+ acpi_integer *value)
{
struct acpi_ipmi_buffer *buffer;
@@ -305,6 +321,7 @@ static void acpi_format_ipmi_response(struct acpi_ipmi_msg *msg,
* IPMI message returned by IPMI command.
*/
buffer = (struct acpi_ipmi_buffer *)value;
+
/*
* If the flag of msg_done is not set, it means that the IPMI command is
* not executed correctly.
@@ -312,6 +329,7 @@ static void acpi_format_ipmi_response(struct acpi_ipmi_msg *msg,
buffer->status = msg->msg_done;
if (msg->msg_done != ACPI_IPMI_OK)
return;
+
/*
* If the IPMI response message is obtained correctly, the status code
* will be ACPI_IPMI_OK
@@ -379,11 +397,12 @@ static void ipmi_msg_handler(struct ipmi_recv_msg *msg, void *user_msg_data)
unsigned long flags;
if (msg->user != ipmi_device->user_interface) {
- dev_warn(dev, "Unexpected response is returned. "
- "returned user %p, expected user %p\n",
- msg->user, ipmi_device->user_interface);
+ dev_warn(dev,
+ "Unexpected response is returned. returned user %p, expected user %p\n",
+ msg->user, ipmi_device->user_interface);
goto out_msg;
}
+
spin_lock_irqsave(&ipmi_device->tx_msg_lock, flags);
list_for_each_entry_safe(tx_msg, temp, &ipmi_device->tx_msg_list, head) {
if (msg->msgid == tx_msg->tx_msgid) {
@@ -395,8 +414,9 @@ static void ipmi_msg_handler(struct ipmi_recv_msg *msg, void *user_msg_data)
spin_unlock_irqrestore(&ipmi_device->tx_msg_lock, flags);
if (!msg_found) {
- dev_warn(dev, "Unexpected response (msg id %ld) is "
- "returned.\n", msg->msgid);
+ dev_warn(dev,
+ "Unexpected response (msg id %ld) is returned.\n",
+ msg->msgid);
goto out_msg;
}
@@ -407,6 +427,7 @@ static void ipmi_msg_handler(struct ipmi_recv_msg *msg, void *user_msg_data)
msg->msg.data_len);
goto out_comp;
}
+
/* response msg is an error msg */
msg->recv_type = IPMI_RESPONSE_RECV_TYPE;
if (msg->recv_type == IPMI_RESPONSE_RECV_TYPE &&
@@ -418,15 +439,17 @@ static void ipmi_msg_handler(struct ipmi_recv_msg *msg, void *user_msg_data)
}
goto out_comp;
}
+
tx_msg->rx_len = msg->msg.data_len;
memcpy(tx_msg->data, msg->msg.data, tx_msg->rx_len);
tx_msg->msg_done = ACPI_IPMI_OK;
+
out_comp:
complete(&tx_msg->tx_complete);
acpi_ipmi_msg_put(tx_msg);
out_msg:
ipmi_free_recv_msg(msg);
-};
+}
static void ipmi_register_bmc(int iface, struct device *dev)
{
@@ -436,7 +459,6 @@ static void ipmi_register_bmc(int iface, struct device *dev)
acpi_handle handle;
err = ipmi_get_smi_info(iface, &smi_data);
-
if (err)
return;
@@ -461,11 +483,11 @@ static void ipmi_register_bmc(int iface, struct device *dev)
if (temp->handle == handle)
goto err_lock;
}
-
if (!driver_data.selected_smi)
driver_data.selected_smi = ipmi_device;
list_add_tail(&ipmi_device->head, &driver_data.ipmi_devices);
mutex_unlock(&driver_data.ipmi_lock);
+
put_device(smi_data.dev);
return;
@@ -484,7 +506,7 @@ static void ipmi_bmc_gone(int iface)
mutex_lock(&driver_data.ipmi_lock);
list_for_each_entry_safe(ipmi_device, temp,
- &driver_data.ipmi_devices, head) {
+ &driver_data.ipmi_devices, head) {
if (ipmi_device->ipmi_ifnum != iface) {
dev_found = true;
__ipmi_dev_kill(ipmi_device);
@@ -496,14 +518,13 @@ static void ipmi_bmc_gone(int iface)
&driver_data.ipmi_devices,
struct acpi_ipmi_device, head);
mutex_unlock(&driver_data.ipmi_lock);
+
if (dev_found) {
ipmi_flush_tx_msg(ipmi_device);
acpi_ipmi_dev_put(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
@@ -516,17 +537,17 @@ static void ipmi_bmc_gone(int iface)
* 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)
+ u32 bits, acpi_integer *value,
+ void *handler_context, void *region_context)
{
struct acpi_ipmi_msg *tx_msg;
struct acpi_ipmi_device *ipmi_device;
int err;
acpi_status status;
unsigned long flags;
+
/*
* IPMI opregion message.
* IPMI message is firstly written to the BMC and system software
@@ -539,13 +560,13 @@ acpi_ipmi_space_handler(u32 function, acpi_physical_address address,
tx_msg = ipmi_msg_alloc();
if (!tx_msg)
return AE_NOT_EXIST;
-
ipmi_device = tx_msg->device;
if (acpi_format_ipmi_request(tx_msg, address, value) != 0) {
ipmi_msg_release(tx_msg);
return AE_TYPE;
}
+
acpi_ipmi_msg_get(tx_msg);
mutex_lock(&driver_data.ipmi_lock);
/* Do not add a tx_msg that can not be flushed. */
@@ -558,16 +579,18 @@ acpi_ipmi_space_handler(u32 function, acpi_physical_address address,
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);
+ &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;
@@ -586,8 +609,9 @@ static int __init acpi_ipmi_init(void)
return 0;
status = acpi_install_address_space_handler(ACPI_ROOT_OBJECT,
- ACPI_ADR_SPACE_IPMI, &acpi_ipmi_space_handler,
- NULL, NULL);
+ 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;
@@ -629,7 +653,8 @@ static void __exit acpi_ipmi_exit(void)
}
mutex_unlock(&driver_data.ipmi_lock);
acpi_remove_address_space_handler(ACPI_ROOT_OBJECT,
- ACPI_ADR_SPACE_IPMI, &acpi_ipmi_space_handler);
+ ACPI_ADR_SPACE_IPMI,
+ &acpi_ipmi_space_handler);
}
module_init(acpi_ipmi_init);
generated by cgit v1.2.3 (git 2.0.4) at 2024-11-04 04:12:24 +0000