*
*
* 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_remove(struct acpi_device *device, int type);
static int acpi_memory_device_start(struct acpi_device *device);
+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 list_head res_list;
};
+static int acpi_hotmem_initialized;
+
static acpi_status
acpi_memory_get_resource(struct acpi_resource *resource, void *context)
{
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->device->handle, "_STA",
* 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;
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;
mem_device->state = MEMORY_INVALID_STATE;
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 */
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;
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));
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));
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;
struct acpi_memory_device *mem_device;
int result = 0;
+ /*
+ * 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;
+
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"));
+ printk(KERN_ERR PREFIX
+ "Error in acpi_memory_enable_device\n");
}
return result;
}
return -ENODEV;
}
+ acpi_hotmem_initialized = 1;
return 0;
}
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