[linux-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"

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

#ifdef CONFIG_ACPI_HOTPLUG_MEMORY

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;
	struct list_head res_list;
	int mgid;
};

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;
	mhp_t mhp_flags = MHP_NID_IS_MGID;
	int result, num_enabled = 0;
	struct acpi_memory_info *info;
	u64 total_length = 0;
	int node, mgid;

	node = acpi_get_node(handle);

	list_for_each_entry(info, &mem_device->res_list, list) {
		if (!info->length)
			continue;
		/* We want a single node for the whole memory group */
		if (node < 0)
			node = memory_add_physaddr_to_nid(info->start_addr);
		total_length += info->length;
	}

	if (!total_length) {
		dev_err(&mem_device->device->dev, "device is empty\n");
		return -EINVAL;
	}

	mgid = memory_group_register_static(node, PFN_UP(total_length));
	if (mgid < 0)
		return mgid;
	mem_device->mgid = mgid;

	/*
	 * 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 the memory block size is zero, please ignore it.
		 * Don't try to do the following memory hotplug flowchart.
		 */
		if (!info->length)
			continue;

		mhp_flags |= MHP_MEMMAP_ON_MEMORY;
		result = __add_memory(mgid, info->start_addr, info->length,
				      mhp_flags);

		/*
		 * 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");
		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)
{
	struct acpi_memory_info *info, *n;

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

		acpi_unbind_memory_blocks(info);
		__remove_memory(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;

	/* In case we succeeded adding *some* memory, unregistering fails. */
	if (mem_device->mgid >= 0)
		memory_group_unregister(mem_device->mgid);

	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;
	mem_device->mgid = -1;
	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;
	}

	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"
1da177e4 LT	24
cccd4208 RW	25	static const struct acpi_device_id memory_device_ids[] = {
	26	{ACPI_MEMORY_DEVICE_HID, 0},
	27	{"", 0},
	28	};
	29
	30	#ifdef CONFIG_ACPI_HOTPLUG_MEMORY
	31
0a347644 RW	32	static int acpi_memory_device_add(struct acpi_device *device,
	33	const struct acpi_device_id *not_used);
	34	static void acpi_memory_device_remove(struct acpi_device *device);
1da177e4	35
0a347644	36	static struct acpi_scan_handler memory_device_handler = {
1ba90e3a	37	.ids = memory_device_ids,
0a347644 RW	38	.attach = acpi_memory_device_add,
	39	.detach = acpi_memory_device_remove,
	40	.hotplug = {
	41	.enabled = true,
	42	},
1da177e4 LT	43	};
1da177e4 LT	44
9ac02398 KH	45	struct acpi_memory_info {
	46	struct list_head list;
	47	u64 start_addr; /* Memory Range start physical addr */
	48	u64 length; /* Memory Range length */
	49	unsigned short caching; /* memory cache attribute */
	50	unsigned short write_protect; /* memory read/write attribute */
	51	unsigned int enabled:1;
	52	};
	53
1da177e4	54	struct acpi_memory_device {
c18483a8	55	struct acpi_device *device;
9ac02398	56	struct list_head res_list;
2a157839	57	int mgid;
1da177e4 LT	58	};
1da177e4 LT	59
9ac02398 KH	60	static acpi_status
	61	acpi_memory_get_resource(struct acpi_resource resource, void context)
	62	{
	63	struct acpi_memory_device *mem_device = context;
	64	struct acpi_resource_address64 address64;
	65	struct acpi_memory_info info, new;
	66	acpi_status status;
	67
	68	status = acpi_resource_to_address64(resource, &address64);
	69	if (ACPI_FAILURE(status) \|\|
	70	(address64.resource_type != ACPI_MEMORY_RANGE))
	71	return AE_OK;
	72
	73	list_for_each_entry(info, &mem_device->res_list, list) {
	74	/* Can we combine the resource range information? */
	75	if ((info->caching == address64.info.mem.caching) &&
	76	(info->write_protect == address64.info.mem.write_protect) &&
a45de93e LZ	77	(info->start_addr + info->length == address64.address.minimum)) {
a45de93e LZ	78	info->length += address64.address.address_length;
9ac02398 KH	79	return AE_OK;
	80	}
	81	}
	82
	83	new = kzalloc(sizeof(struct acpi_memory_info), GFP_KERNEL);
	84	if (!new)
	85	return AE_ERROR;
	86
	87	INIT_LIST_HEAD(&new->list);
	88	new->caching = address64.info.mem.caching;
	89	new->write_protect = address64.info.mem.write_protect;
a45de93e LZ	90	new->start_addr = address64.address.minimum;
a45de93e LZ	91	new->length = address64.address.address_length;
9ac02398 KH	92	list_add_tail(&new->list, &mem_device->res_list);
	93
	94	return AE_OK;
	95	}
	96
386e52b9 WC	97	static void
	98	acpi_memory_free_device_resources(struct acpi_memory_device *mem_device)
	99	{
	100	struct acpi_memory_info info, n;
	101
	102	list_for_each_entry_safe(info, n, &mem_device->res_list, list)
	103	kfree(info);
	104	INIT_LIST_HEAD(&mem_device->res_list);
	105	}
	106
1da177e4 LT	107	static int
	108	acpi_memory_get_device_resources(struct acpi_memory_device *mem_device)
	109	{
	110	acpi_status status;
1da177e4	111
5d2870fa KH	112	if (!list_empty(&mem_device->res_list))
	113	return 0;
	114
b8632785	115	status = acpi_walk_resources(mem_device->device->handle, METHOD_NAME__CRS,
9ac02398 KH	116	acpi_memory_get_resource, mem_device);
9ac02398 KH	117	if (ACPI_FAILURE(status)) {
386e52b9	118	acpi_memory_free_device_resources(mem_device);
d550d98d	119	return -EINVAL;
1da177e4 LT	120	}
1da177e4 LT	121
d550d98d	122	return 0;
1da177e4 LT	123	}
1da177e4 LT	124
4be44fcd	125	static int acpi_memory_check_device(struct acpi_memory_device *mem_device)
1da177e4	126	{
27663c58	127	unsigned long long current_status;
1da177e4 LT	128
1da177e4 LT	129	/* Get device present/absent information from the _STA */
16ff816d ZY	130	if (ACPI_FAILURE(acpi_evaluate_integer(mem_device->device->handle,
	131	METHOD_NAME__STA, NULL,
	132	&current_status)))
d550d98d	133	return -ENODEV;
1da177e4 LT	134	/*
	135	* Check for device status. Device should be
	136	* present/enabled/functioning.
	137	*/
a0bd4ac4 BH	138	if (!((current_status & ACPI_STA_DEVICE_PRESENT)
	139	&& (current_status & ACPI_STA_DEVICE_ENABLED)
	140	&& (current_status & ACPI_STA_DEVICE_FUNCTIONING)))
d550d98d	141	return -ENODEV;
1da177e4	142
d550d98d	143	return 0;
1da177e4 LT	144	}
1da177e4 LT	145
e2ff3940 RW	146	static int acpi_bind_memblk(struct memory_block mem, void arg)
e2ff3940 RW	147	{
24dee1fc	148	return acpi_bind_one(&mem->dev, arg);
e2ff3940 RW	149	}
	150
	151	static int acpi_bind_memory_blocks(struct acpi_memory_info *info,
24dee1fc	152	struct acpi_device *adev)
e2ff3940	153	{
fbcf73ce DH	154	return walk_memory_blocks(info->start_addr, info->length, adev,
fbcf73ce DH	155	acpi_bind_memblk);
e2ff3940 RW	156	}
	157
	158	static int acpi_unbind_memblk(struct memory_block mem, void arg)
	159	{
	160	acpi_unbind_one(&mem->dev);
	161	return 0;
	162	}
	163
24dee1fc	164	static void acpi_unbind_memory_blocks(struct acpi_memory_info *info)
e2ff3940	165	{
fbcf73ce DH	166	walk_memory_blocks(info->start_addr, info->length, NULL,
fbcf73ce DH	167	acpi_unbind_memblk);
e2ff3940 RW	168	}
e2ff3940 RW	169
4be44fcd	170	static int acpi_memory_enable_device(struct acpi_memory_device *mem_device)
1da177e4	171	{
e2ff3940	172	acpi_handle handle = mem_device->device->handle;
2a157839	173	mhp_t mhp_flags = MHP_NID_IS_MGID;
9ac02398 KH	174	int result, num_enabled = 0;
9ac02398 KH	175	struct acpi_memory_info *info;
2a157839 DH	176	u64 total_length = 0;
2a157839 DH	177	int node, mgid;
1da177e4	178
e2ff3940	179	node = acpi_get_node(handle);
2a157839 DH	180
	181	list_for_each_entry(info, &mem_device->res_list, list) {
	182	if (!info->length)
	183	continue;
	184	/* We want a single node for the whole memory group */
	185	if (node < 0)
	186	node = memory_add_physaddr_to_nid(info->start_addr);
	187	total_length += info->length;
	188	}
	189
	190	if (!total_length) {
	191	dev_err(&mem_device->device->dev, "device is empty\n");
	192	return -EINVAL;
	193	}
	194
	195	mgid = memory_group_register_static(node, PFN_UP(total_length));
	196	if (mgid < 0)
	197	return mgid;
	198	mem_device->mgid = mgid;
	199
1da177e4 LT	200	/*
	201	* Tell the VM there is more memory here...
	202	* Note: Assume that this function returns zero on success
9ac02398 KH	203	* We don't have memory-hot-add rollback function,now.
9ac02398 KH	204	* (i.e. memory-hot-remove function)
1da177e4	205	*/
9ac02398	206	list_for_each_entry(info, &mem_device->res_list, list) {
5d2619fc ZY	207	/*
	208	* If the memory block size is zero, please ignore it.
	209	* Don't try to do the following memory hotplug flowchart.
	210	*/
	211	if (!info->length)
	212	continue;
8c2676a5	213
e3c2bfdd	214	mhp_flags \|= MHP_MEMMAP_ON_MEMORY;
2a157839	215	result = __add_memory(mgid, info->start_addr, info->length,
4a3e5de9	216	mhp_flags);
65479472 WC	217
	218	/*
	219	* If the memory block has been used by the kernel, add_memory()
	220	* returns -EEXIST. If add_memory() returns the other error, it
	221	* means that this memory block is not used by the kernel.
	222	*/
fd4655c2	223	if (result && result != -EEXIST)
9ac02398	224	continue;
65479472	225
24dee1fc	226	result = acpi_bind_memory_blocks(info, mem_device->device);
e2ff3940	227	if (result) {
24dee1fc	228	acpi_unbind_memory_blocks(info);
e2ff3940 RW	229	return -ENODEV;
	230	}
	231
bb49d82d YI	232	info->enabled = 1;
bb49d82d YI	233
65479472 WC	234	/*
	235	* Add num_enable even if add_memory() returns -EEXIST, so the
	236	* device is bound to this driver.
	237	*/
9ac02398 KH	238	num_enabled++;
	239	}
	240	if (!num_enabled) {
ab6c5709	241	dev_err(&mem_device->device->dev, "add_memory failed\n");
9ac02398	242	return -EINVAL;
1da177e4	243	}
5d2619fc ZY	244	/*
	245	* Sometimes the memory device will contain several memory blocks.
	246	* When one memory block is hot-added to the system memory, it will
	247	* be regarded as a success.
	248	* Otherwise if the last memory block can't be hot-added to the system
	249	* memory, it will be failure and the memory device can't be bound with
	250	* driver.
	251	*/
	252	return 0;
1da177e4 LT	253	}
1da177e4 LT	254
242831eb	255	static void acpi_memory_remove_memory(struct acpi_memory_device *mem_device)
1da177e4	256	{
9ac02398	257	struct acpi_memory_info info, n;
60a5a19e	258
9ac02398	259	list_for_each_entry_safe(info, n, &mem_device->res_list, list) {
65479472	260	if (!info->enabled)
fd4655c2	261	continue;
65479472	262
24dee1fc	263	acpi_unbind_memory_blocks(info);
e1c158e4	264	__remove_memory(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
2a157839 DH	275	/* In case we succeeded adding some memory, unregistering fails. */
	276	if (mem_device->mgid >= 0)
	277	memory_group_unregister(mem_device->mgid);
	278
386e52b9	279	acpi_memory_free_device_resources(mem_device);
0a347644	280	mem_device->device->driver_data = NULL;
386e52b9 WC	281	kfree(mem_device);
	282	}
	283
0a347644 RW	284	static int acpi_memory_device_add(struct acpi_device *device,
0a347644 RW	285	const struct acpi_device_id *not_used)
1da177e4	286	{
0a347644	287	struct acpi_memory_device *mem_device;
1da177e4	288	int result;
1da177e4 LT	289
1da177e4 LT	290	if (!device)
d550d98d	291	return -EINVAL;
1da177e4	292
36bcbec7	293	mem_device = kzalloc(sizeof(struct acpi_memory_device), GFP_KERNEL);
1da177e4	294	if (!mem_device)
d550d98d	295	return -ENOMEM;
1da177e4	296
9ac02398	297	INIT_LIST_HEAD(&mem_device->res_list);
3b74863d	298	mem_device->device = device;
2a157839	299	mem_device->mgid = -1;
1da177e4 LT	300	sprintf(acpi_device_name(device), "%s", ACPI_MEMORY_DEVICE_NAME);
1da177e4 LT	301	sprintf(acpi_device_class(device), "%s", ACPI_MEMORY_DEVICE_CLASS);
db89b4f0	302	device->driver_data = mem_device;
1da177e4 LT	303
	304	/* Get the range from the _CRS */
	305	result = acpi_memory_get_device_resources(mem_device);
	306	if (result) {
d19f503e	307	device->driver_data = NULL;
1da177e4	308	kfree(mem_device);
d550d98d	309	return result;
1da177e4 LT	310	}
1da177e4 LT	311
0a347644 RW	312	result = acpi_memory_check_device(mem_device);
	313	if (result) {
	314	acpi_memory_device_free(mem_device);
	315	return 0;
	316	}
1da177e4	317
0a347644 RW	318	result = acpi_memory_enable_device(mem_device);
	319	if (result) {
	320	dev_err(&device->dev, "acpi_memory_enable_device() error\n");
	321	acpi_memory_device_free(mem_device);
e2ff3940	322	return result;
1f425994	323	}
0a347644 RW	324
	325	dev_dbg(&device->dev, "Memory device configured by ACPI\n");
	326	return 1;
1f425994 YG	327	}
1f425994 YG	328
0a347644	329	static void acpi_memory_device_remove(struct acpi_device *device)
80f20fef	330	{
0a347644	331	struct acpi_memory_device *mem_device;
80f20fef BH	332
80f20fef BH	333	if (!device \|\| !acpi_driver_data(device))
0a347644	334	return;
80f20fef BH	335
80f20fef BH	336	mem_device = acpi_driver_data(device);
0a347644	337	acpi_memory_remove_memory(mem_device);
386e52b9	338	acpi_memory_device_free(mem_device);
1da177e4 LT	339	}
1da177e4 LT	340
00159a20 PB	341	static bool __initdata acpi_no_memhotplug;
00159a20 PB	342
0a347644	343	void __init acpi_memory_hotplug_init(void)
1da177e4	344	{
cccd4208 RW	345	if (acpi_no_memhotplug) {
	346	memory_device_handler.attach = NULL;
	347	acpi_scan_add_handler(&memory_device_handler);
00159a20	348	return;
cccd4208	349	}
0a347644	350	acpi_scan_add_handler_with_hotplug(&memory_device_handler, "memory");
1da177e4	351	}
00159a20 PB	352
	353	static int __init disable_acpi_memory_hotplug(char *str)
	354	{
	355	acpi_no_memhotplug = true;
	356	return 1;
	357	}
	358	__setup("acpi_no_memhotplug", disable_acpi_memory_hotplug);
cccd4208 RW	359
	360	#else
	361
	362	static struct acpi_scan_handler memory_device_handler = {
	363	.ids = memory_device_ids,
	364	};
	365
	366	void __init acpi_memory_hotplug_init(void)
	367	{
	368	acpi_scan_add_handler(&memory_device_handler);
	369	}
	370
	371	#endif /* CONFIG_ACPI_HOTPLUG_MEMORY */