*
*
* ACPI based HotPlug driver that supports Memory Hotplug
- * This driver fields notifications from firmare for memory add
+ * This driver fields notifications from firmware for memory add
* and remove operations and alerts the VM of the affected memory
* ranges.
*/
#include <linux/memory_hotplug.h>
#include <acpi/acpi_drivers.h>
-#define ACPI_MEMORY_DEVICE_COMPONENT 0x08000000UL
#define ACPI_MEMORY_DEVICE_CLASS "memory"
#define ACPI_MEMORY_DEVICE_HID "PNP0C80"
-#define ACPI_MEMORY_DEVICE_DRIVER_NAME "Hotplug Mem Driver"
#define ACPI_MEMORY_DEVICE_NAME "Hotplug Mem Device"
#define _COMPONENT ACPI_MEMORY_DEVICE_COMPONENT
-ACPI_MODULE_NAME("acpi_memory")
- MODULE_AUTHOR("Naveen B S <naveen.b.s@intel.com>");
-MODULE_DESCRIPTION(ACPI_MEMORY_DEVICE_DRIVER_NAME);
-MODULE_LICENSE("GPL");
+#undef PREFIX
+#define PREFIX "ACPI:memory_hp:"
-/* ACPI _STA method values */
-#define ACPI_MEMORY_STA_PRESENT (0x00000001UL)
-#define ACPI_MEMORY_STA_ENABLED (0x00000002UL)
-#define ACPI_MEMORY_STA_FUNCTIONAL (0x00000008UL)
+ACPI_MODULE_NAME("acpi_memhotplug");
+MODULE_AUTHOR("Naveen B S <naveen.b.s@intel.com>");
+MODULE_DESCRIPTION("Hotplug Mem Driver");
+MODULE_LICENSE("GPL");
/* Memory Device States */
#define MEMORY_INVALID_STATE 0
static int acpi_memory_device_add(struct acpi_device *device);
static int acpi_memory_device_remove(struct acpi_device *device, int type);
+static const struct acpi_device_id memory_device_ids[] = {
+ {ACPI_MEMORY_DEVICE_HID, 0},
+ {"", 0},
+};
+MODULE_DEVICE_TABLE(acpi, memory_device_ids);
+
static struct acpi_driver acpi_memory_device_driver = {
- .name = ACPI_MEMORY_DEVICE_DRIVER_NAME,
+ .name = "acpi_memhotplug",
.class = ACPI_MEMORY_DEVICE_CLASS,
- .ids = ACPI_MEMORY_DEVICE_HID,
+ .ids = memory_device_ids,
.ops = {
.add = acpi_memory_device_add,
.remove = acpi_memory_device_remove,
},
};
-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 */
+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 {
+ struct acpi_device * device;
+ unsigned int state; /* State of the memory device */
+ struct list_head res_list;
};
+static int acpi_hotmem_initialized;
+
+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;
+ 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 -EINVAL;
+ if (!list_empty(&mem_device->res_list))
+ return 0;
- 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->length = address64.address_length;
- }
+ status = acpi_walk_resources(mem_device->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);
+ INIT_LIST_HEAD(&mem_device->res_list);
+ return -EINVAL;
}
- acpi_os_free(buffer.pointer);
return 0;
}
acpi_handle phandle;
struct acpi_device *device = NULL;
struct acpi_device *pdevice = NULL;
+ int result;
if (!acpi_bus_get_device(handle, &device) && device)
}
/* Get the parent device */
- status = acpi_bus_get_device(phandle, &pdevice);
- if (ACPI_FAILURE(status)) {
- ACPI_EXCEPTION((AE_INFO, status, "Cannot get acpi bus device"));
+ result = acpi_bus_get_device(phandle, &pdevice);
+ if (result) {
+ printk(KERN_WARNING PREFIX "Cannot get acpi bus device");
return -EINVAL;
}
* Now add the notified device. This creates the acpi_device
* and invokes .add function
*/
- status = acpi_bus_add(&device, pdevice, handle, ACPI_BUS_TYPE_DEVICE);
- if (ACPI_FAILURE(status)) {
- ACPI_EXCEPTION((AE_INFO, status, "Cannot add acpi bus"));
+ result = acpi_bus_add(&device, pdevice, handle, ACPI_BUS_TYPE_DEVICE);
+ if (result) {
+ printk(KERN_WARNING PREFIX "Cannot add acpi bus");
return -EINVAL;
}
static int acpi_memory_check_device(struct acpi_memory_device *mem_device)
{
- unsigned long current_status;
-
+ unsigned long long current_status;
/* Get device present/absent information from the _STA */
- if (ACPI_FAILURE(acpi_evaluate_integer(mem_device->handle, "_STA",
+ if (ACPI_FAILURE(acpi_evaluate_integer(mem_device->device->handle, "_STA",
NULL, ¤t_status)))
return -ENODEV;
/*
* Check for device status. Device should be
* present/enabled/functioning.
*/
- if (!((current_status & ACPI_MEMORY_STA_PRESENT)
- && (current_status & ACPI_MEMORY_STA_ENABLED)
- && (current_status & ACPI_MEMORY_STA_FUNCTIONAL)))
+ if (!((current_status & ACPI_STA_DEVICE_PRESENT)
+ && (current_status & ACPI_STA_DEVICE_ENABLED)
+ && (current_status & ACPI_STA_DEVICE_FUNCTIONING)))
return -ENODEV;
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;
/* Get the range from the _CRS */
return result;
}
+ node = acpi_get_node(mem_device->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->length);
- if (result) {
+ list_for_each_entry(info, &mem_device->res_list, list) {
+ if (info->enabled) { /* just sanity check...*/
+ num_enabled++;
+ continue;
+ }
+ /*
+ * If the memory block size is zero, please ignore it.
+ * Don't try to do the following memory hotplug flowchart.
+ */
+ if (!info->length)
+ continue;
+ if (node < 0)
+ node = memory_add_physaddr_to_nid(info->start_addr);
+
+ 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;
+ /*
+ * Sometimes the memory device will contain several memory blocks.
+ * When one memory block is hot-added to the system memory, it will
+ * be regarded as a success.
+ * Otherwise if the last memory block can't be hot-added to the system
+ * memory, it will be failure and the memory device can't be bound with
+ * driver.
+ */
+ return 0;
}
static int acpi_memory_powerdown_device(struct acpi_memory_device *mem_device)
acpi_status status;
struct acpi_object_list arg_list;
union acpi_object arg;
- unsigned long current_status;
+ unsigned long long current_status;
/* Issue the _EJ0 command */
arg_list.pointer = &arg;
arg.type = ACPI_TYPE_INTEGER;
arg.integer.value = 1;
- status = acpi_evaluate_object(mem_device->handle,
+ status = acpi_evaluate_object(mem_device->device->handle,
"_EJ0", &arg_list, NULL);
/* Return on _EJ0 failure */
if (ACPI_FAILURE(status)) {
}
/* Evalute _STA to check if the device is disabled */
- status = acpi_evaluate_integer(mem_device->handle, "_STA",
+ status = acpi_evaluate_integer(mem_device->device->handle, "_STA",
NULL, ¤t_status);
if (ACPI_FAILURE(status))
return -ENODEV;
/* Check for device status. Device should be disabled */
- if (current_status & ACPI_MEMORY_STA_ENABLED)
+ if (current_status & ACPI_STA_DEVICE_ENABLED)
return -EINVAL;
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->length;
+ struct acpi_memory_info *info, *n;
/*
* Ask the VM to offline this memory range.
* Note: Assume that this function returns zero on success
*/
- result = remove_memory(start, len);
- if (result)
- return 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 (!device)
return -EINVAL;
- mem_device = kmalloc(sizeof(struct acpi_memory_device), GFP_KERNEL);
+ mem_device = kzalloc(sizeof(struct acpi_memory_device), GFP_KERNEL);
if (!mem_device)
return -ENOMEM;
- memset(mem_device, 0, sizeof(struct acpi_memory_device));
- mem_device->handle = device->handle;
+ INIT_LIST_HEAD(&mem_device->res_list);
+ mem_device->device = device;
sprintf(acpi_device_name(device), "%s", ACPI_MEMORY_DEVICE_NAME);
sprintf(acpi_device_class(device), "%s", ACPI_MEMORY_DEVICE_CLASS);
- acpi_driver_data(device) = mem_device;
+ device->driver_data = mem_device;
/* Get the range from the _CRS */
result = acpi_memory_get_device_resources(mem_device);
/* Set the device state */
mem_device->state = MEMORY_POWER_ON_STATE;
- printk(KERN_INFO "%s \n", acpi_device_name(device));
+ printk(KERN_DEBUG "%s \n", acpi_device_name(device));
+ /*
+ * Early boot code has recognized memory area by EFI/E820.
+ * If DSDT shows these memory devices on boot, hotplug is not necessary
+ * for them. So, it just returns until completion of this driver's
+ * start up.
+ */
+ if (!acpi_hotmem_initialized)
+ return 0;
+
+ if (!acpi_memory_check_device(mem_device)) {
+ /* call add_memory func */
+ result = acpi_memory_enable_device(mem_device);
+ if (result)
+ printk(KERN_ERR PREFIX
+ "Error in acpi_memory_enable_device\n");
+ }
return result;
}
if (!device || !acpi_driver_data(device))
return -EINVAL;
- mem_device = (struct acpi_memory_device *)acpi_driver_data(device);
+ mem_device = acpi_driver_data(device);
kfree(mem_device);
return 0;
{
char *hardware_id;
acpi_status status;
- struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
struct acpi_device_info *info;
-
- status = acpi_get_object_info(handle, &buffer);
+ status = acpi_get_object_info(handle, &info);
if (ACPI_FAILURE(status))
return status;
- info = buffer.pointer;
if (!(info->valid & ACPI_VALID_HID)) {
- acpi_os_free(buffer.pointer);
+ kfree(info);
return AE_ERROR;
}
- hardware_id = info->hardware_id.value;
+ hardware_id = info->hardware_id.string;
if ((hardware_id == NULL) ||
(strcmp(hardware_id, ACPI_MEMORY_DEVICE_HID)))
status = AE_ERROR;
- acpi_os_free(buffer.pointer);
+ kfree(info);
return status;
}
status = is_memory_device(handle);
- if (ACPI_FAILURE(status)){
- ACPI_EXCEPTION((AE_INFO, status, "handle is no memory device"));
+ if (ACPI_FAILURE(status))
return AE_OK; /* continue */
- }
status = acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
acpi_memory_device_notify, NULL);
status = is_memory_device(handle);
- if (ACPI_FAILURE(status)){
- ACPI_EXCEPTION((AE_INFO, status, "handle is no memory device"));
+ if (ACPI_FAILURE(status))
return AE_OK; /* continue */
- }
status = acpi_remove_notify_handler(handle,
ACPI_SYSTEM_NOTIFY,
return -ENODEV;
}
+ acpi_hotmem_initialized = 1;
return 0;
}
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff