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path: root/drivers/acpi/acpi_memhotplug.c
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Diffstat (limited to 'drivers/acpi/acpi_memhotplug.c')
-rw-r--r--drivers/acpi/acpi_memhotplug.c279
1 files changed, 162 insertions, 117 deletions
diff --git a/drivers/acpi/acpi_memhotplug.c b/drivers/acpi/acpi_memhotplug.c
index d882bf87fa96..cd57372a6729 100644
--- a/drivers/acpi/acpi_memhotplug.c
+++ b/drivers/acpi/acpi_memhotplug.c
@@ -57,6 +57,7 @@ MODULE_LICENSE("GPL");
static int acpi_memory_device_add(struct acpi_device *device);
static int acpi_memory_device_remove(struct acpi_device *device, int type);
+static int acpi_memory_device_start(struct acpi_device *device);
static struct acpi_driver acpi_memory_device_driver = {
.name = ACPI_MEMORY_DEVICE_DRIVER_NAME,
@@ -65,49 +66,78 @@ static struct acpi_driver acpi_memory_device_driver = {
.ops = {
.add = acpi_memory_device_add,
.remove = acpi_memory_device_remove,
+ .start = acpi_memory_device_start,
},
};
+struct acpi_memory_info {
+ struct list_head list;
+ u64 start_addr; /* Memory Range start physical addr */
+ u64 length; /* Memory Range length */
+ unsigned short caching; /* memory cache attribute */
+ unsigned short write_protect; /* memory read/write attribute */
+ unsigned int enabled:1;
+};
+
struct acpi_memory_device {
acpi_handle handle;
unsigned int state; /* State of the memory device */
- unsigned short caching; /* memory cache attribute */
- unsigned short write_protect; /* memory read/write attribute */
- u64 start_addr; /* Memory Range start physical addr */
- u64 end_addr; /* Memory Range end physical addr */
+ struct list_head res_list;
};
+static acpi_status
+acpi_memory_get_resource(struct acpi_resource *resource, void *context)
+{
+ struct acpi_memory_device *mem_device = context;
+ struct acpi_resource_address64 address64;
+ struct acpi_memory_info *info, *new;
+ acpi_status status;
+
+ status = acpi_resource_to_address64(resource, &address64);
+ if (ACPI_FAILURE(status) ||
+ (address64.resource_type != ACPI_MEMORY_RANGE))
+ return AE_OK;
+
+ list_for_each_entry(info, &mem_device->res_list, list) {
+ /* Can we combine the resource range information? */
+ if ((info->caching == address64.info.mem.caching) &&
+ (info->write_protect == address64.info.mem.write_protect) &&
+ (info->start_addr + info->length == address64.minimum)) {
+ info->length += address64.address_length;
+ return AE_OK;
+ }
+ }
+
+ new = kzalloc(sizeof(struct acpi_memory_info), GFP_KERNEL);
+ if (!new)
+ return AE_ERROR;
+
+ INIT_LIST_HEAD(&new->list);
+ new->caching = address64.info.mem.caching;
+ new->write_protect = address64.info.mem.write_protect;
+ new->start_addr = address64.minimum;
+ new->length = address64.address_length;
+ list_add_tail(&new->list, &mem_device->res_list);
+
+ return AE_OK;
+}
+
static int
acpi_memory_get_device_resources(struct acpi_memory_device *mem_device)
{
acpi_status status;
- struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
- struct acpi_resource *resource = NULL;
- struct acpi_resource_address64 address64;
-
- ACPI_FUNCTION_TRACE("acpi_memory_get_device_resources");
+ struct acpi_memory_info *info, *n;
- /* Get the range from the _CRS */
- status = acpi_get_current_resources(mem_device->handle, &buffer);
- if (ACPI_FAILURE(status))
- return_VALUE(-EINVAL);
- resource = (struct acpi_resource *)buffer.pointer;
- status = acpi_resource_to_address64(resource, &address64);
- if (ACPI_SUCCESS(status)) {
- if (address64.resource_type == ACPI_MEMORY_RANGE) {
- /* Populate the structure */
- mem_device->caching =
- address64.info.mem.caching;
- mem_device->write_protect =
- address64.info.mem.write_protect;
- mem_device->start_addr = address64.minimum;
- mem_device->end_addr = address64.maximum;
- }
+ status = acpi_walk_resources(mem_device->handle, METHOD_NAME__CRS,
+ acpi_memory_get_resource, mem_device);
+ if (ACPI_FAILURE(status)) {
+ list_for_each_entry_safe(info, n, &mem_device->res_list, list)
+ kfree(info);
+ return -EINVAL;
}
- acpi_os_free(buffer.pointer);
- return_VALUE(0);
+ return 0;
}
static int
@@ -119,23 +149,21 @@ acpi_memory_get_device(acpi_handle handle,
struct acpi_device *device = NULL;
struct acpi_device *pdevice = NULL;
- ACPI_FUNCTION_TRACE("acpi_memory_get_device");
if (!acpi_bus_get_device(handle, &device) && device)
goto end;
status = acpi_get_parent(handle, &phandle);
if (ACPI_FAILURE(status)) {
- ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error in acpi_get_parent\n"));
- return_VALUE(-EINVAL);
+ ACPI_EXCEPTION((AE_INFO, status, "Cannot find acpi parent"));
+ return -EINVAL;
}
/* Get the parent device */
status = acpi_bus_get_device(phandle, &pdevice);
if (ACPI_FAILURE(status)) {
- ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
- "Error in acpi_bus_get_device\n"));
- return_VALUE(-EINVAL);
+ ACPI_EXCEPTION((AE_INFO, status, "Cannot get acpi bus device"));
+ return -EINVAL;
}
/*
@@ -144,30 +172,29 @@ acpi_memory_get_device(acpi_handle handle,
*/
status = acpi_bus_add(&device, pdevice, handle, ACPI_BUS_TYPE_DEVICE);
if (ACPI_FAILURE(status)) {
- ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error in acpi_bus_add\n"));
- return_VALUE(-EINVAL);
+ ACPI_EXCEPTION((AE_INFO, status, "Cannot add acpi bus"));
+ return -EINVAL;
}
end:
*mem_device = acpi_driver_data(device);
if (!(*mem_device)) {
printk(KERN_ERR "\n driver data not found");
- return_VALUE(-ENODEV);
+ return -ENODEV;
}
- return_VALUE(0);
+ return 0;
}
static int acpi_memory_check_device(struct acpi_memory_device *mem_device)
{
unsigned long current_status;
- ACPI_FUNCTION_TRACE("acpi_memory_check_device");
/* Get device present/absent information from the _STA */
if (ACPI_FAILURE(acpi_evaluate_integer(mem_device->handle, "_STA",
NULL, &current_status)))
- return_VALUE(-ENODEV);
+ return -ENODEV;
/*
* Check for device status. Device should be
* present/enabled/functioning.
@@ -175,36 +202,55 @@ static int acpi_memory_check_device(struct acpi_memory_device *mem_device)
if (!((current_status & ACPI_MEMORY_STA_PRESENT)
&& (current_status & ACPI_MEMORY_STA_ENABLED)
&& (current_status & ACPI_MEMORY_STA_FUNCTIONAL)))
- return_VALUE(-ENODEV);
+ return -ENODEV;
- return_VALUE(0);
+ return 0;
}
static int acpi_memory_enable_device(struct acpi_memory_device *mem_device)
{
- int result;
+ int result, num_enabled = 0;
+ struct acpi_memory_info *info;
+ int node;
- ACPI_FUNCTION_TRACE("acpi_memory_enable_device");
/* Get the range from the _CRS */
result = acpi_memory_get_device_resources(mem_device);
if (result) {
- ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
- "\nget_device_resources failed\n"));
+ printk(KERN_ERR PREFIX "get_device_resources failed\n");
mem_device->state = MEMORY_INVALID_STATE;
return result;
}
+ node = acpi_get_node(mem_device->handle);
/*
* Tell the VM there is more memory here...
* Note: Assume that this function returns zero on success
+ * We don't have memory-hot-add rollback function,now.
+ * (i.e. memory-hot-remove function)
*/
- result = add_memory(mem_device->start_addr,
- (mem_device->end_addr - mem_device->start_addr) + 1);
- if (result) {
- ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "\nadd_memory failed\n"));
+ list_for_each_entry(info, &mem_device->res_list, list) {
+ u64 start_pfn, end_pfn;
+
+ start_pfn = info->start_addr >> PAGE_SHIFT;
+ end_pfn = (info->start_addr + info->length - 1) >> PAGE_SHIFT;
+
+ if (pfn_valid(start_pfn) || pfn_valid(end_pfn)) {
+ /* already enabled. try next area */
+ num_enabled++;
+ continue;
+ }
+
+ result = add_memory(node, info->start_addr, info->length);
+ if (result)
+ continue;
+ info->enabled = 1;
+ num_enabled++;
+ }
+ if (!num_enabled) {
+ printk(KERN_ERR PREFIX "add_memory failed\n");
mem_device->state = MEMORY_INVALID_STATE;
- return result;
+ return -EINVAL;
}
return result;
@@ -217,7 +263,6 @@ static int acpi_memory_powerdown_device(struct acpi_memory_device *mem_device)
union acpi_object arg;
unsigned long current_status;
- ACPI_FUNCTION_TRACE("acpi_memory_powerdown_device");
/* Issue the _EJ0 command */
arg_list.count = 1;
@@ -228,46 +273,45 @@ static int acpi_memory_powerdown_device(struct acpi_memory_device *mem_device)
"_EJ0", &arg_list, NULL);
/* Return on _EJ0 failure */
if (ACPI_FAILURE(status)) {
- ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "_EJ0 failed.\n"));
- return_VALUE(-ENODEV);
+ ACPI_EXCEPTION((AE_INFO, status, "_EJ0 failed"));
+ return -ENODEV;
}
/* Evalute _STA to check if the device is disabled */
status = acpi_evaluate_integer(mem_device->handle, "_STA",
NULL, &current_status);
if (ACPI_FAILURE(status))
- return_VALUE(-ENODEV);
+ return -ENODEV;
/* Check for device status. Device should be disabled */
if (current_status & ACPI_MEMORY_STA_ENABLED)
- return_VALUE(-EINVAL);
+ return -EINVAL;
- return_VALUE(0);
+ return 0;
}
static int acpi_memory_disable_device(struct acpi_memory_device *mem_device)
{
int result;
- u64 start = mem_device->start_addr;
- u64 len = mem_device->end_addr - start + 1;
+ struct acpi_memory_info *info, *n;
- ACPI_FUNCTION_TRACE("acpi_memory_disable_device");
/*
* Ask the VM to offline this memory range.
* Note: Assume that this function returns zero on success
*/
- result = remove_memory(start, len);
- if (result) {
- ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Hot-Remove failed.\n"));
- return_VALUE(result);
+ list_for_each_entry_safe(info, n, &mem_device->res_list, list) {
+ if (info->enabled) {
+ result = remove_memory(info->start_addr, info->length);
+ if (result)
+ return result;
+ }
+ kfree(info);
}
/* Power-off and eject the device */
result = acpi_memory_powerdown_device(mem_device);
if (result) {
- ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
- "Device Power Down failed.\n"));
/* Set the status of the device to invalid */
mem_device->state = MEMORY_INVALID_STATE;
return result;
@@ -282,7 +326,6 @@ static void acpi_memory_device_notify(acpi_handle handle, u32 event, void *data)
struct acpi_memory_device *mem_device;
struct acpi_device *device;
- ACPI_FUNCTION_TRACE("acpi_memory_device_notify");
switch (event) {
case ACPI_NOTIFY_BUS_CHECK:
@@ -294,15 +337,14 @@ static void acpi_memory_device_notify(acpi_handle handle, u32 event, void *data)
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"\nReceived DEVICE CHECK notification for device\n"));
if (acpi_memory_get_device(handle, &mem_device)) {
- ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
- "Error in finding driver data\n"));
- return_VOID;
+ printk(KERN_ERR PREFIX "Cannot find driver data\n");
+ return;
}
if (!acpi_memory_check_device(mem_device)) {
if (acpi_memory_enable_device(mem_device))
- ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
- "Error in acpi_memory_enable_device\n"));
+ printk(KERN_ERR PREFIX
+ "Cannot enable memory device\n");
}
break;
case ACPI_NOTIFY_EJECT_REQUEST:
@@ -310,14 +352,12 @@ static void acpi_memory_device_notify(acpi_handle handle, u32 event, void *data)
"\nReceived EJECT REQUEST notification for device\n"));
if (acpi_bus_get_device(handle, &device)) {
- ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
- "Device doesn't exist\n"));
+ printk(KERN_ERR PREFIX "Device doesn't exist\n");
break;
}
mem_device = acpi_driver_data(device);
if (!mem_device) {
- ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
- "Driver Data is NULL\n"));
+ printk(KERN_ERR PREFIX "Driver Data is NULL\n");
break;
}
@@ -328,8 +368,8 @@ static void acpi_memory_device_notify(acpi_handle handle, u32 event, void *data)
* with generic sysfs driver
*/
if (acpi_memory_disable_device(mem_device))
- ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
- "Error in acpi_memory_disable_device\n"));
+ printk(KERN_ERR PREFIX
+ "Disable memory device\n");
/*
* TBD: Invoke acpi_bus_remove to cleanup data structures
*/
@@ -340,7 +380,7 @@ static void acpi_memory_device_notify(acpi_handle handle, u32 event, void *data)
break;
}
- return_VOID;
+ return;
}
static int acpi_memory_device_add(struct acpi_device *device)
@@ -348,16 +388,16 @@ static int acpi_memory_device_add(struct acpi_device *device)
int result;
struct acpi_memory_device *mem_device = NULL;
- ACPI_FUNCTION_TRACE("acpi_memory_device_add");
if (!device)
- return_VALUE(-EINVAL);
+ return -EINVAL;
mem_device = kmalloc(sizeof(struct acpi_memory_device), GFP_KERNEL);
if (!mem_device)
- return_VALUE(-ENOMEM);
+ return -ENOMEM;
memset(mem_device, 0, sizeof(struct acpi_memory_device));
+ INIT_LIST_HEAD(&mem_device->res_list);
mem_device->handle = device->handle;
sprintf(acpi_device_name(device), "%s", ACPI_MEMORY_DEVICE_NAME);
sprintf(acpi_device_class(device), "%s", ACPI_MEMORY_DEVICE_CLASS);
@@ -367,7 +407,7 @@ static int acpi_memory_device_add(struct acpi_device *device)
result = acpi_memory_get_device_resources(mem_device);
if (result) {
kfree(mem_device);
- return_VALUE(result);
+ return result;
}
/* Set the device state */
@@ -375,22 +415,38 @@ static int acpi_memory_device_add(struct acpi_device *device)
printk(KERN_INFO "%s \n", acpi_device_name(device));
- return_VALUE(result);
+ return result;
}
static int acpi_memory_device_remove(struct acpi_device *device, int type)
{
struct acpi_memory_device *mem_device = NULL;
- ACPI_FUNCTION_TRACE("acpi_memory_device_remove");
if (!device || !acpi_driver_data(device))
- return_VALUE(-EINVAL);
+ return -EINVAL;
mem_device = (struct acpi_memory_device *)acpi_driver_data(device);
kfree(mem_device);
- return_VALUE(0);
+ return 0;
+}
+
+static int acpi_memory_device_start (struct acpi_device *device)
+{
+ struct acpi_memory_device *mem_device;
+ int result = 0;
+
+ mem_device = acpi_driver_data(device);
+
+ if (!acpi_memory_check_device(mem_device)) {
+ /* call add_memory func */
+ result = acpi_memory_enable_device(mem_device);
+ if (result)
+ ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
+ "Error in acpi_memory_enable_device\n"));
+ }
+ return result;
}
/*
@@ -403,16 +459,15 @@ static acpi_status is_memory_device(acpi_handle handle)
struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
struct acpi_device_info *info;
- ACPI_FUNCTION_TRACE("is_memory_device");
status = acpi_get_object_info(handle, &buffer);
if (ACPI_FAILURE(status))
- return_ACPI_STATUS(AE_ERROR);
+ return status;
info = buffer.pointer;
if (!(info->valid & ACPI_VALID_HID)) {
acpi_os_free(buffer.pointer);
- return_ACPI_STATUS(AE_ERROR);
+ return AE_ERROR;
}
hardware_id = info->hardware_id.value;
@@ -421,7 +476,7 @@ static acpi_status is_memory_device(acpi_handle handle)
status = AE_ERROR;
acpi_os_free(buffer.pointer);
- return_ACPI_STATUS(status);
+ return status;
}
static acpi_status
@@ -430,21 +485,17 @@ acpi_memory_register_notify_handler(acpi_handle handle,
{
acpi_status status;
- ACPI_FUNCTION_TRACE("acpi_memory_register_notify_handler");
status = is_memory_device(handle);
- if (ACPI_FAILURE(status))
- return_ACPI_STATUS(AE_OK); /* continue */
+ if (ACPI_FAILURE(status)){
+ ACPI_EXCEPTION((AE_INFO, status, "handle is no memory device"));
+ return AE_OK; /* continue */
+ }
status = acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
acpi_memory_device_notify, NULL);
- if (ACPI_FAILURE(status)) {
- ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
- "Error installing notify handler\n"));
- return_ACPI_STATUS(AE_OK); /* continue */
- }
-
- return_ACPI_STATUS(status);
+ /* continue */
+ return AE_OK;
}
static acpi_status
@@ -453,22 +504,18 @@ acpi_memory_deregister_notify_handler(acpi_handle handle,
{
acpi_status status;
- ACPI_FUNCTION_TRACE("acpi_memory_deregister_notify_handler");
status = is_memory_device(handle);
- if (ACPI_FAILURE(status))
- return_ACPI_STATUS(AE_OK); /* continue */
+ if (ACPI_FAILURE(status)){
+ ACPI_EXCEPTION((AE_INFO, status, "handle is no memory device"));
+ return AE_OK; /* continue */
+ }
status = acpi_remove_notify_handler(handle,
ACPI_SYSTEM_NOTIFY,
acpi_memory_device_notify);
- if (ACPI_FAILURE(status)) {
- ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
- "Error removing notify handler\n"));
- return_ACPI_STATUS(AE_OK); /* continue */
- }
- return_ACPI_STATUS(status);
+ return AE_OK; /* continue */
}
static int __init acpi_memory_device_init(void)
@@ -476,12 +523,11 @@ static int __init acpi_memory_device_init(void)
int result;
acpi_status status;
- ACPI_FUNCTION_TRACE("acpi_memory_device_init");
result = acpi_bus_register_driver(&acpi_memory_device_driver);
if (result < 0)
- return_VALUE(-ENODEV);
+ return -ENODEV;
status = acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
ACPI_UINT32_MAX,
@@ -489,19 +535,18 @@ static int __init acpi_memory_device_init(void)
NULL, NULL);
if (ACPI_FAILURE(status)) {
- ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "walk_namespace failed\n"));
+ ACPI_EXCEPTION((AE_INFO, status, "walk_namespace failed"));
acpi_bus_unregister_driver(&acpi_memory_device_driver);
- return_VALUE(-ENODEV);
+ return -ENODEV;
}
- return_VALUE(0);
+ return 0;
}
static void __exit acpi_memory_device_exit(void)
{
acpi_status status;
- ACPI_FUNCTION_TRACE("acpi_memory_device_exit");
/*
* Adding this to un-install notification handlers for all the device
@@ -513,11 +558,11 @@ static void __exit acpi_memory_device_exit(void)
NULL, NULL);
if (ACPI_FAILURE(status))
- ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "walk_namespace failed\n"));
+ ACPI_EXCEPTION((AE_INFO, status, "walk_namespace failed"));
acpi_bus_unregister_driver(&acpi_memory_device_driver);
- return_VOID;
+ return;
}
module_init(acpi_memory_device_init);
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-13 00:08:52 +0100