[linux-2.6-block.git] / drivers / acpi / acpi_memhotplug.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Copyright (C) 2004, 2013 Intel Corporation
 * Author: Naveen B S <naveen.b.s@intel.com>
 * Author: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
 *
 * All rights reserved.
 *
 * ACPI based HotPlug driver that supports Memory Hotplug
 * This driver fields notifications from firmware for memory add
 * and remove operations and alerts the VM of the affected memory
 * ranges.
 */

#include <linux/acpi.h>
#include <linux/memory.h>
#include <linux/memory_hotplug.h>

#include "internal.h"

#define ACPI_MEMORY_DEVICE_CLASS		"memory"
#define ACPI_MEMORY_DEVICE_HID			"PNP0C80"
#define ACPI_MEMORY_DEVICE_NAME			"Hotplug Mem Device"

#define _COMPONENT		ACPI_MEMORY_DEVICE_COMPONENT

#undef PREFIX
#define 	PREFIX		"ACPI:memory_hp:"

ACPI_MODULE_NAME("acpi_memhotplug");

static const struct acpi_device_id memory_device_ids[] = {
	{ACPI_MEMORY_DEVICE_HID, 0},
	{"", 0},
};

#ifdef CONFIG_ACPI_HOTPLUG_MEMORY

/* 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,
				  const struct acpi_device_id *not_used);
static void acpi_memory_device_remove(struct acpi_device *device);

static struct acpi_scan_handler memory_device_handler = {
	.ids = memory_device_ids,
	.attach = acpi_memory_device_add,
	.detach = acpi_memory_device_remove,
	.hotplug = {
		.enabled = true,
	},
};

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 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.address.minimum)) {
			info->length += address64.address.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.address.minimum;
	new->length = address64.address.address_length;
	list_add_tail(&new->list, &mem_device->res_list);

	return AE_OK;
}

static void
acpi_memory_free_device_resources(struct acpi_memory_device *mem_device)
{
	struct acpi_memory_info *info, *n;

	list_for_each_entry_safe(info, n, &mem_device->res_list, list)
		kfree(info);
	INIT_LIST_HEAD(&mem_device->res_list);
}

static int
acpi_memory_get_device_resources(struct acpi_memory_device *mem_device)
{
	acpi_status status;

	if (!list_empty(&mem_device->res_list))
		return 0;

	status = acpi_walk_resources(mem_device->device->handle, METHOD_NAME__CRS,
				     acpi_memory_get_resource, mem_device);
	if (ACPI_FAILURE(status)) {
		acpi_memory_free_device_resources(mem_device);
		return -EINVAL;
	}

	return 0;
}

static int acpi_memory_check_device(struct acpi_memory_device *mem_device)
{
	unsigned long long current_status;

	/* Get device present/absent information from the _STA */
	if (ACPI_FAILURE(acpi_evaluate_integer(mem_device->device->handle,
					       METHOD_NAME__STA, NULL,
					       &current_status)))
		return -ENODEV;
	/*
	 * Check for device status. Device should be
	 * present/enabled/functioning.
	 */
	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_bind_memblk(struct memory_block *mem, void *arg)
{
	return acpi_bind_one(&mem->dev, arg);
}

static int acpi_bind_memory_blocks(struct acpi_memory_info *info,
				   struct acpi_device *adev)
{
	return walk_memory_blocks(info->start_addr, info->length, adev,
				  acpi_bind_memblk);
}

static int acpi_unbind_memblk(struct memory_block *mem, void *arg)
{
	acpi_unbind_one(&mem->dev);
	return 0;
}

static void acpi_unbind_memory_blocks(struct acpi_memory_info *info)
{
	walk_memory_blocks(info->start_addr, info->length, NULL,
			   acpi_unbind_memblk);
}

static int acpi_memory_enable_device(struct acpi_memory_device *mem_device)
{
	acpi_handle handle = mem_device->device->handle;
	int result, num_enabled = 0;
	struct acpi_memory_info *info;
	int node;

	node = acpi_get_node(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)
	 */
	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 the memory block has been used by the kernel, add_memory()
		 * returns -EEXIST. If add_memory() returns the other error, it
		 * means that this memory block is not used by the kernel.
		 */
		if (result && result != -EEXIST)
			continue;

		result = acpi_bind_memory_blocks(info, mem_device->device);
		if (result) {
			acpi_unbind_memory_blocks(info);
			return -ENODEV;
		}

		info->enabled = 1;

		/*
		 * Add num_enable even if add_memory() returns -EEXIST, so the
		 * device is bound to this driver.
		 */
		num_enabled++;
	}
	if (!num_enabled) {
		dev_err(&mem_device->device->dev, "add_memory failed\n");
		mem_device->state = MEMORY_INVALID_STATE;
		return -EINVAL;
	}
	/*
	 * 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 void acpi_memory_remove_memory(struct acpi_memory_device *mem_device)
{
	acpi_handle handle = mem_device->device->handle;
	struct acpi_memory_info *info, *n;
	int nid = acpi_get_node(handle);

	list_for_each_entry_safe(info, n, &mem_device->res_list, list) {
		if (!info->enabled)
			continue;

		if (nid == NUMA_NO_NODE)
			nid = memory_add_physaddr_to_nid(info->start_addr);

		acpi_unbind_memory_blocks(info);
		__remove_memory(nid, info->start_addr, info->length);
		list_del(&info->list);
		kfree(info);
	}
}

static void acpi_memory_device_free(struct acpi_memory_device *mem_device)
{
	if (!mem_device)
		return;

	acpi_memory_free_device_resources(mem_device);
	mem_device->device->driver_data = NULL;
	kfree(mem_device);
}

static int acpi_memory_device_add(struct acpi_device *device,
				  const struct acpi_device_id *not_used)
{
	struct acpi_memory_device *mem_device;
	int result;

	if (!device)
		return -EINVAL;

	mem_device = kzalloc(sizeof(struct acpi_memory_device), GFP_KERNEL);
	if (!mem_device)
		return -ENOMEM;

	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);
	device->driver_data = mem_device;

	/* Get the range from the _CRS */
	result = acpi_memory_get_device_resources(mem_device);
	if (result) {
		device->driver_data = NULL;
		kfree(mem_device);
		return result;
	}

	/* Set the device state */
	mem_device->state = MEMORY_POWER_ON_STATE;

	result = acpi_memory_check_device(mem_device);
	if (result) {
		acpi_memory_device_free(mem_device);
		return 0;
	}

	result = acpi_memory_enable_device(mem_device);
	if (result) {
		dev_err(&device->dev, "acpi_memory_enable_device() error\n");
		acpi_memory_device_free(mem_device);
		return result;
	}

	dev_dbg(&device->dev, "Memory device configured by ACPI\n");
	return 1;
}

static void acpi_memory_device_remove(struct acpi_device *device)
{
	struct acpi_memory_device *mem_device;

	if (!device || !acpi_driver_data(device))
		return;

	mem_device = acpi_driver_data(device);
	acpi_memory_remove_memory(mem_device);
	acpi_memory_device_free(mem_device);
}

static bool __initdata acpi_no_memhotplug;

void __init acpi_memory_hotplug_init(void)
{
	if (acpi_no_memhotplug) {
		memory_device_handler.attach = NULL;
		acpi_scan_add_handler(&memory_device_handler);
		return;
	}
	acpi_scan_add_handler_with_hotplug(&memory_device_handler, "memory");
}

static int __init disable_acpi_memory_hotplug(char *str)
{
	acpi_no_memhotplug = true;
	return 1;
}
__setup("acpi_no_memhotplug", disable_acpi_memory_hotplug);

#else

static struct acpi_scan_handler memory_device_handler = {
	.ids = memory_device_ids,
};

void __init acpi_memory_hotplug_init(void)
{
	acpi_scan_add_handler(&memory_device_handler);
}

#endif /* CONFIG_ACPI_HOTPLUG_MEMORY */
Commit	Line	Data
4359375c	1	// SPDX-License-Identifier: GPL-2.0-or-later
1da177e4	2	/*
0a347644 RW	3	* Copyright (C) 2004, 2013 Intel Corporation
	4	* Author: Naveen B S <naveen.b.s@intel.com>
	5	* Author: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
1da177e4 LT	6	*
	7	* All rights reserved.
	8	*
1da177e4	9	* ACPI based HotPlug driver that supports Memory Hotplug
c7060d9e	10	* This driver fields notifications from firmware for memory add
1da177e4 LT	11	* and remove operations and alerts the VM of the affected memory
	12	* ranges.
	13	*/
	14
ab6c5709	15	#include <linux/acpi.h>
e2ff3940	16	#include <linux/memory.h>
0a347644 RW	17	#include <linux/memory_hotplug.h>
	18
	19	#include "internal.h"
1da177e4	20
1da177e4 LT	21	#define ACPI_MEMORY_DEVICE_CLASS "memory"
1da177e4 LT	22	#define ACPI_MEMORY_DEVICE_HID "PNP0C80"
1da177e4 LT	23	#define ACPI_MEMORY_DEVICE_NAME "Hotplug Mem Device"
	24
	25	#define _COMPONENT ACPI_MEMORY_DEVICE_COMPONENT
	26
aa7b2b2e ZY	27	#undef PREFIX
	28	#define PREFIX "ACPI:memory_hp:"
	29
f52fd66d	30	ACPI_MODULE_NAME("acpi_memhotplug");
1da177e4	31
cccd4208 RW	32	static const struct acpi_device_id memory_device_ids[] = {
	33	{ACPI_MEMORY_DEVICE_HID, 0},
	34	{"", 0},
	35	};
	36
	37	#ifdef CONFIG_ACPI_HOTPLUG_MEMORY
	38
1da177e4 LT	39	/* Memory Device States */
	40	#define MEMORY_INVALID_STATE 0
	41	#define MEMORY_POWER_ON_STATE 1
	42	#define MEMORY_POWER_OFF_STATE 2
	43
0a347644 RW	44	static int acpi_memory_device_add(struct acpi_device *device,
	45	const struct acpi_device_id *not_used);
	46	static void acpi_memory_device_remove(struct acpi_device *device);
1da177e4	47
0a347644	48	static struct acpi_scan_handler memory_device_handler = {
1ba90e3a	49	.ids = memory_device_ids,
0a347644 RW	50	.attach = acpi_memory_device_add,
	51	.detach = acpi_memory_device_remove,
	52	.hotplug = {
	53	.enabled = true,
	54	},
1da177e4 LT	55	};
1da177e4 LT	56
9ac02398 KH	57	struct acpi_memory_info {
	58	struct list_head list;
	59	u64 start_addr; /* Memory Range start physical addr */
	60	u64 length; /* Memory Range length */
	61	unsigned short caching; /* memory cache attribute */
	62	unsigned short write_protect; /* memory read/write attribute */
	63	unsigned int enabled:1;
	64	};
	65
1da177e4	66	struct acpi_memory_device {
3b74863d	67	struct acpi_device * device;
4be44fcd	68	unsigned int state; /* State of the memory device */
9ac02398	69	struct list_head res_list;
1da177e4 LT	70	};
1da177e4 LT	71
9ac02398 KH	72	static acpi_status
	73	acpi_memory_get_resource(struct acpi_resource resource, void context)
	74	{
	75	struct acpi_memory_device *mem_device = context;
	76	struct acpi_resource_address64 address64;
	77	struct acpi_memory_info info, new;
	78	acpi_status status;
	79
	80	status = acpi_resource_to_address64(resource, &address64);
	81	if (ACPI_FAILURE(status) \|\|
	82	(address64.resource_type != ACPI_MEMORY_RANGE))
	83	return AE_OK;
	84
	85	list_for_each_entry(info, &mem_device->res_list, list) {
	86	/* Can we combine the resource range information? */
	87	if ((info->caching == address64.info.mem.caching) &&
	88	(info->write_protect == address64.info.mem.write_protect) &&
a45de93e LZ	89	(info->start_addr + info->length == address64.address.minimum)) {
a45de93e LZ	90	info->length += address64.address.address_length;
9ac02398 KH	91	return AE_OK;
	92	}
	93	}
	94
	95	new = kzalloc(sizeof(struct acpi_memory_info), GFP_KERNEL);
	96	if (!new)
	97	return AE_ERROR;
	98
	99	INIT_LIST_HEAD(&new->list);
	100	new->caching = address64.info.mem.caching;
	101	new->write_protect = address64.info.mem.write_protect;
a45de93e LZ	102	new->start_addr = address64.address.minimum;
a45de93e LZ	103	new->length = address64.address.address_length;
9ac02398 KH	104	list_add_tail(&new->list, &mem_device->res_list);
	105
	106	return AE_OK;
	107	}
	108
386e52b9 WC	109	static void
	110	acpi_memory_free_device_resources(struct acpi_memory_device *mem_device)
	111	{
	112	struct acpi_memory_info info, n;
	113
	114	list_for_each_entry_safe(info, n, &mem_device->res_list, list)
	115	kfree(info);
	116	INIT_LIST_HEAD(&mem_device->res_list);
	117	}
	118
1da177e4 LT	119	static int
	120	acpi_memory_get_device_resources(struct acpi_memory_device *mem_device)
	121	{
	122	acpi_status status;
1da177e4	123
5d2870fa KH	124	if (!list_empty(&mem_device->res_list))
	125	return 0;
	126
b8632785	127	status = acpi_walk_resources(mem_device->device->handle, METHOD_NAME__CRS,
9ac02398 KH	128	acpi_memory_get_resource, mem_device);
9ac02398 KH	129	if (ACPI_FAILURE(status)) {
386e52b9	130	acpi_memory_free_device_resources(mem_device);
d550d98d	131	return -EINVAL;
1da177e4 LT	132	}
1da177e4 LT	133
d550d98d	134	return 0;
1da177e4 LT	135	}
1da177e4 LT	136
4be44fcd	137	static int acpi_memory_check_device(struct acpi_memory_device *mem_device)
1da177e4	138	{
27663c58	139	unsigned long long current_status;
1da177e4 LT	140
1da177e4 LT	141	/* Get device present/absent information from the _STA */
16ff816d ZY	142	if (ACPI_FAILURE(acpi_evaluate_integer(mem_device->device->handle,
	143	METHOD_NAME__STA, NULL,
	144	&current_status)))
d550d98d	145	return -ENODEV;
1da177e4 LT	146	/*
	147	* Check for device status. Device should be
	148	* present/enabled/functioning.
	149	*/
a0bd4ac4 BH	150	if (!((current_status & ACPI_STA_DEVICE_PRESENT)
	151	&& (current_status & ACPI_STA_DEVICE_ENABLED)
	152	&& (current_status & ACPI_STA_DEVICE_FUNCTIONING)))
d550d98d	153	return -ENODEV;
1da177e4	154
d550d98d	155	return 0;
1da177e4 LT	156	}
1da177e4 LT	157
e2ff3940 RW	158	static int acpi_bind_memblk(struct memory_block mem, void arg)
e2ff3940 RW	159	{
24dee1fc	160	return acpi_bind_one(&mem->dev, arg);
e2ff3940 RW	161	}
	162
	163	static int acpi_bind_memory_blocks(struct acpi_memory_info *info,
24dee1fc	164	struct acpi_device *adev)
e2ff3940	165	{
fbcf73ce DH	166	return walk_memory_blocks(info->start_addr, info->length, adev,
fbcf73ce DH	167	acpi_bind_memblk);
e2ff3940 RW	168	}
	169
	170	static int acpi_unbind_memblk(struct memory_block mem, void arg)
	171	{
	172	acpi_unbind_one(&mem->dev);
	173	return 0;
	174	}
	175
24dee1fc	176	static void acpi_unbind_memory_blocks(struct acpi_memory_info *info)
e2ff3940	177	{
fbcf73ce DH	178	walk_memory_blocks(info->start_addr, info->length, NULL,
fbcf73ce DH	179	acpi_unbind_memblk);
e2ff3940 RW	180	}
e2ff3940 RW	181
4be44fcd	182	static int acpi_memory_enable_device(struct acpi_memory_device *mem_device)
1da177e4	183	{
e2ff3940	184	acpi_handle handle = mem_device->device->handle;
9ac02398 KH	185	int result, num_enabled = 0;
9ac02398 KH	186	struct acpi_memory_info *info;
1e3590e2	187	int node;
1da177e4	188
e2ff3940	189	node = acpi_get_node(handle);
1da177e4 LT	190	/*
	191	* Tell the VM there is more memory here...
	192	* Note: Assume that this function returns zero on success
9ac02398 KH	193	* We don't have memory-hot-add rollback function,now.
9ac02398 KH	194	* (i.e. memory-hot-remove function)
1da177e4	195	*/
9ac02398	196	list_for_each_entry(info, &mem_device->res_list, list) {
fa25d8d6	197	if (info->enabled) { /* just sanity check...*/
dd56a8e3 YG	198	num_enabled++;
	199	continue;
	200	}
5d2619fc ZY	201	/*
	202	* If the memory block size is zero, please ignore it.
	203	* Don't try to do the following memory hotplug flowchart.
	204	*/
	205	if (!info->length)
	206	continue;
8c2676a5 KM	207	if (node < 0)
	208	node = memory_add_physaddr_to_nid(info->start_addr);
	209
8df1d0e4	210	result = __add_memory(node, info->start_addr, info->length);
65479472 WC	211
	212	/*
	213	* If the memory block has been used by the kernel, add_memory()
	214	* returns -EEXIST. If add_memory() returns the other error, it
	215	* means that this memory block is not used by the kernel.
	216	*/
fd4655c2	217	if (result && result != -EEXIST)
9ac02398	218	continue;
65479472	219
24dee1fc	220	result = acpi_bind_memory_blocks(info, mem_device->device);
e2ff3940	221	if (result) {
24dee1fc	222	acpi_unbind_memory_blocks(info);
e2ff3940 RW	223	return -ENODEV;
	224	}
	225
bb49d82d YI	226	info->enabled = 1;
bb49d82d YI	227
65479472 WC	228	/*
	229	* Add num_enable even if add_memory() returns -EEXIST, so the
	230	* device is bound to this driver.
	231	*/
9ac02398 KH	232	num_enabled++;
	233	}
	234	if (!num_enabled) {
ab6c5709	235	dev_err(&mem_device->device->dev, "add_memory failed\n");
1da177e4	236	mem_device->state = MEMORY_INVALID_STATE;
9ac02398	237	return -EINVAL;
1da177e4	238	}
5d2619fc ZY	239	/*
	240	* Sometimes the memory device will contain several memory blocks.
	241	* When one memory block is hot-added to the system memory, it will
	242	* be regarded as a success.
	243	* Otherwise if the last memory block can't be hot-added to the system
	244	* memory, it will be failure and the memory device can't be bound with
	245	* driver.
	246	*/
	247	return 0;
1da177e4 LT	248	}
1da177e4 LT	249
242831eb	250	static void acpi_memory_remove_memory(struct acpi_memory_device *mem_device)
1da177e4	251	{
e2ff3940	252	acpi_handle handle = mem_device->device->handle;
9ac02398	253	struct acpi_memory_info info, n;
242831eb	254	int nid = acpi_get_node(handle);
60a5a19e	255
9ac02398	256	list_for_each_entry_safe(info, n, &mem_device->res_list, list) {
65479472	257	if (!info->enabled)
fd4655c2	258	continue;
65479472	259
1bb25df0	260	if (nid == NUMA_NO_NODE)
60a5a19e	261	nid = memory_add_physaddr_to_nid(info->start_addr);
e2ff3940	262
24dee1fc	263	acpi_unbind_memory_blocks(info);
d15e5926	264	__remove_memory(nid, info->start_addr, info->length);
19387b27	265	list_del(&info->list);
9ac02398	266	kfree(info);
1da177e4	267	}
19387b27 YI	268	}
19387b27 YI	269
386e52b9 WC	270	static void acpi_memory_device_free(struct acpi_memory_device *mem_device)
	271	{
	272	if (!mem_device)
	273	return;
	274
	275	acpi_memory_free_device_resources(mem_device);
0a347644	276	mem_device->device->driver_data = NULL;
386e52b9 WC	277	kfree(mem_device);
	278	}
	279
0a347644 RW	280	static int acpi_memory_device_add(struct acpi_device *device,
0a347644 RW	281	const struct acpi_device_id *not_used)
1da177e4	282	{
0a347644	283	struct acpi_memory_device *mem_device;
1da177e4	284	int result;
1da177e4 LT	285
1da177e4 LT	286	if (!device)
d550d98d	287	return -EINVAL;
1da177e4	288
36bcbec7	289	mem_device = kzalloc(sizeof(struct acpi_memory_device), GFP_KERNEL);
1da177e4	290	if (!mem_device)
d550d98d	291	return -ENOMEM;
1da177e4	292
9ac02398	293	INIT_LIST_HEAD(&mem_device->res_list);
3b74863d	294	mem_device->device = device;
1da177e4 LT	295	sprintf(acpi_device_name(device), "%s", ACPI_MEMORY_DEVICE_NAME);
1da177e4 LT	296	sprintf(acpi_device_class(device), "%s", ACPI_MEMORY_DEVICE_CLASS);
db89b4f0	297	device->driver_data = mem_device;
1da177e4 LT	298
	299	/* Get the range from the _CRS */
	300	result = acpi_memory_get_device_resources(mem_device);
	301	if (result) {
d19f503e	302	device->driver_data = NULL;
1da177e4	303	kfree(mem_device);
d550d98d	304	return result;
1da177e4 LT	305	}
	306
	307	/* Set the device state */
	308	mem_device->state = MEMORY_POWER_ON_STATE;
	309
0a347644 RW	310	result = acpi_memory_check_device(mem_device);
	311	if (result) {
	312	acpi_memory_device_free(mem_device);
	313	return 0;
	314	}
1da177e4	315
0a347644 RW	316	result = acpi_memory_enable_device(mem_device);
	317	if (result) {
	318	dev_err(&device->dev, "acpi_memory_enable_device() error\n");
	319	acpi_memory_device_free(mem_device);
e2ff3940	320	return result;
1f425994	321	}
0a347644 RW	322
	323	dev_dbg(&device->dev, "Memory device configured by ACPI\n");
	324	return 1;
1f425994 YG	325	}
1f425994 YG	326
0a347644	327	static void acpi_memory_device_remove(struct acpi_device *device)
80f20fef	328	{
0a347644	329	struct acpi_memory_device *mem_device;
80f20fef BH	330
80f20fef BH	331	if (!device \|\| !acpi_driver_data(device))
0a347644	332	return;
80f20fef BH	333
80f20fef BH	334	mem_device = acpi_driver_data(device);
0a347644	335	acpi_memory_remove_memory(mem_device);
386e52b9	336	acpi_memory_device_free(mem_device);
1da177e4 LT	337	}
1da177e4 LT	338
00159a20 PB	339	static bool __initdata acpi_no_memhotplug;
00159a20 PB	340
0a347644	341	void __init acpi_memory_hotplug_init(void)
1da177e4	342	{
cccd4208 RW	343	if (acpi_no_memhotplug) {
	344	memory_device_handler.attach = NULL;
	345	acpi_scan_add_handler(&memory_device_handler);
00159a20	346	return;
cccd4208	347	}
0a347644	348	acpi_scan_add_handler_with_hotplug(&memory_device_handler, "memory");
1da177e4	349	}
00159a20 PB	350
	351	static int __init disable_acpi_memory_hotplug(char *str)
	352	{
	353	acpi_no_memhotplug = true;
	354	return 1;
	355	}
	356	__setup("acpi_no_memhotplug", disable_acpi_memory_hotplug);
cccd4208 RW	357
	358	#else
	359
	360	static struct acpi_scan_handler memory_device_handler = {
	361	.ids = memory_device_ids,
	362	};
	363
	364	void __init acpi_memory_hotplug_init(void)
	365	{
	366	acpi_scan_add_handler(&memory_device_handler);
	367	}
	368
	369	#endif /* CONFIG_ACPI_HOTPLUG_MEMORY */