Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 542 insertions, 0 deletions

diff --git a/drivers/acpi/acpi_memhotplug.c b/drivers/acpi/acpi_memhotplug.c
new file mode 100644
index 000000000000..77285ffe41c5
--- /dev/null
+++ b/drivers/acpi/acpi_memhotplug.c
@@ -0,0 +1,542 @@
+/*
+ * Copyright (C) 2004 Intel Corporation <naveen.b.s@intel.com>
+ *
+ * All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or (at
+ * your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
+ * NON INFRINGEMENT.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ *
+ * ACPI based HotPlug driver that supports Memory Hotplug
+ * This driver fields notifications from firmare for memory add
+ * and remove operations and alerts the VM of the affected memory
+ * ranges.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/types.h>
+#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");
+
+/* ACPI _STA method values */
+#define ACPI_MEMORY_STA_PRESENT		(0x00000001UL)
+#define ACPI_MEMORY_STA_ENABLED		(0x00000002UL)
+#define ACPI_MEMORY_STA_FUNCTIONAL	(0x00000008UL)
+
+/* Memory Device States */
+#define MEMORY_INVALID_STATE	0
+#define MEMORY_POWER_ON_STATE	1
+#define MEMORY_POWER_OFF_STATE	2
+
+static int acpi_memory_device_add (struct acpi_device *device);
+static int acpi_memory_device_remove (struct acpi_device *device, int type);
+
+static struct acpi_driver acpi_memory_device_driver = {
+	.name =		ACPI_MEMORY_DEVICE_DRIVER_NAME,
+	.class =	ACPI_MEMORY_DEVICE_CLASS,
+	.ids =		ACPI_MEMORY_DEVICE_HID,
+	.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 cache_attribute;	/* memory cache attribute */
+	unsigned short read_write_attribute;/* memory read/write attribute */
+	u64 start_addr;	/* Memory Range start physical addr */
+	u64 end_addr;	/* Memory Range end physical addr */
+};
+
+
+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");
+
+	/* 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->cache_attribute =
+				address64.attribute.memory.cache_attribute;
+			mem_device->read_write_attribute =
+			address64.attribute.memory.read_write_attribute;
+			mem_device->start_addr = address64.min_address_range;
+			mem_device->end_addr = address64.max_address_range;
+		}
+	}
+
+	acpi_os_free(buffer.pointer);
+	return_VALUE(0);
+}
+
+static int
+acpi_memory_get_device(acpi_handle handle,
+	struct acpi_memory_device **mem_device)
+{
+	acpi_status status;
+	acpi_handle phandle;
+	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);
+	}
+
+	/* 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);
+	}
+
+	/*
+	 * 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_DEBUG_PRINT((ACPI_DB_ERROR,
+			"Error in acpi_bus_add\n"));
+		return_VALUE(-EINVAL);
+	}
+
+end:
+	*mem_device = acpi_driver_data(device);
+	if (!(*mem_device)) {
+		printk(KERN_ERR "\n driver data not found" );
+		return_VALUE(-ENODEV);
+	}
+
+	return_VALUE(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);
+	/*
+	 * 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)))
+		return_VALUE(-ENODEV);
+
+	return_VALUE(0);
+}
+
+static int
+acpi_memory_enable_device(struct acpi_memory_device *mem_device)
+{
+	int result;
+
+	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"));
+		mem_device->state = MEMORY_INVALID_STATE;
+		return result;
+	}
+
+	/*
+	 * Tell the VM there is more memory here...
+	 * Note: Assume that this function returns zero on success
+	 */
+	result = add_memory(mem_device->start_addr,
+			(mem_device->end_addr - mem_device->start_addr) + 1,
+			mem_device->read_write_attribute);
+	if (result) {
+		ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
+			"\nadd_memory failed\n"));
+		mem_device->state = MEMORY_INVALID_STATE;
+		return result;
+	}
+
+	return result;
+}
+
+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;
+
+	ACPI_FUNCTION_TRACE("acpi_memory_powerdown_device");
+
+	/* Issue the _EJ0 command */
+	arg_list.count = 1;
+	arg_list.pointer = &arg;
+	arg.type = ACPI_TYPE_INTEGER;
+	arg.integer.value = 1;
+	status = acpi_evaluate_object(mem_device->handle,
+			"_EJ0", &arg_list, NULL);
+	/* Return on _EJ0 failure */
+	if (ACPI_FAILURE(status)) {
+		ACPI_DEBUG_PRINT((ACPI_DB_ERROR,"_EJ0 failed.\n"));
+		return_VALUE(-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);
+
+	/* Check for device status.  Device should be disabled */
+	if (current_status & ACPI_MEMORY_STA_ENABLED)
+		return_VALUE(-EINVAL);
+
+	return_VALUE(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;
+	unsigned long attr = mem_device->read_write_attribute;
+
+	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, attr);
+	if (result) {
+		ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Hot-Remove failed.\n"));
+		return_VALUE(result);
+	}
+
+	/* 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;
+	}
+
+	mem_device->state = MEMORY_POWER_OFF_STATE;
+	return result;
+}
+
+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:
+		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+			"\nReceived BUS CHECK notification for device\n"));
+		/* Fall Through */
+	case ACPI_NOTIFY_DEVICE_CHECK:
+		if (event == ACPI_NOTIFY_DEVICE_CHECK)
+			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;
+		}
+
+		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"));
+		}
+		break;
+	case ACPI_NOTIFY_EJECT_REQUEST:
+		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+			"\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"));
+			break;
+		}
+		mem_device = acpi_driver_data(device);
+		if (!mem_device) {
+			ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
+					"Driver Data is NULL\n"));
+			break;
+		}
+
+		/*
+		 * Currently disabling memory device from kernel mode
+		 * TBD: Can also be disabled from user mode scripts
+		 * TBD: Can also be disabled by Callback registration
+		 * 	with generic sysfs driver
+		 */
+		if (acpi_memory_disable_device(mem_device))
+			ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
+				"Error in acpi_memory_disable_device\n"));
+		/*
+		 * TBD: Invoke acpi_bus_remove to cleanup data structures
+		 */
+		break;
+	default:
+		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+			"Unsupported event [0x%x]\n", event));
+		break;
+	}
+
+	return_VOID;
+}
+
+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);
+
+	mem_device = kmalloc(sizeof(struct acpi_memory_device), GFP_KERNEL);
+	if (!mem_device)
+		return_VALUE(-ENOMEM);
+	memset(mem_device, 0, sizeof(struct acpi_memory_device));
+
+	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);
+	acpi_driver_data(device) = mem_device;
+
+	/* Get the range from the _CRS */
+	result = acpi_memory_get_device_resources(mem_device);
+	if (result) {
+		kfree(mem_device);
+		return_VALUE(result);
+	}
+
+	/* Set the device state */
+	mem_device->state = MEMORY_POWER_ON_STATE;
+
+	printk(KERN_INFO "%s \n", acpi_device_name(device));
+
+	return_VALUE(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);
+
+	mem_device = (struct acpi_memory_device *) acpi_driver_data(device);
+	kfree(mem_device);
+
+	return_VALUE(0);
+}
+
+/*
+ * Helper function to check for memory device
+ */
+static acpi_status
+is_memory_device(acpi_handle handle)
+{
+	char *hardware_id;
+	acpi_status status;
+	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);
+
+	info = buffer.pointer;
+	if (!(info->valid & ACPI_VALID_HID)) {
+		acpi_os_free(buffer.pointer);
+		return_ACPI_STATUS(AE_ERROR);
+	}
+
+	hardware_id = info->hardware_id.value;
+	if ((hardware_id == NULL) ||
+		(strcmp(hardware_id, ACPI_MEMORY_DEVICE_HID)))
+		status = AE_ERROR;
+
+	acpi_os_free(buffer.pointer);
+	return_ACPI_STATUS(status);
+}
+
+static acpi_status
+acpi_memory_register_notify_handler (acpi_handle handle,
+	u32 level, void *ctxt, void **retv)
+{
+	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 */
+
+	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);
+}
+
+static acpi_status
+acpi_memory_deregister_notify_handler (acpi_handle handle,
+			       u32 level, void *ctxt, void **retv)
+{
+	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 */
+
+	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);
+}
+
+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);
+
+	status = acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
+				ACPI_UINT32_MAX,
+				acpi_memory_register_notify_handler,
+				NULL, NULL);
+
+	if (ACPI_FAILURE (status)) {
+		ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "walk_namespace failed\n"));
+		acpi_bus_unregister_driver(&acpi_memory_device_driver);
+		return_VALUE(-ENODEV);
+        }
+
+	return_VALUE(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
+	 * handles.
+	 */
+	status = acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
+			ACPI_UINT32_MAX,
+			acpi_memory_deregister_notify_handler,
+			NULL, NULL);
+
+	if (ACPI_FAILURE (status))
+		ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "walk_namespace failed\n"));
+
+	acpi_bus_unregister_driver(&acpi_memory_device_driver);
+
+	return_VOID;
+}
+
+module_init(acpi_memory_device_init);
+module_exit(acpi_memory_device_exit);
+
+