[linux.git] / drivers / acpi / acpi_memhotplug.c

/*
 * Copyright (C) 2004, 2013 Intel Corporation
 * Author: Naveen B S <[email protected]>
 * Author: Rafael J. Wysocki <[email protected]>
 *
 * 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.
 *
 * 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 unsigned long acpi_meminfo_start_pfn(struct acpi_memory_info *info)
{
	return PFN_DOWN(info->start_addr);
}

static unsigned long acpi_meminfo_end_pfn(struct acpi_memory_info *info)
{
	return PFN_UP(info->start_addr + info->length-1);
}

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_range(acpi_meminfo_start_pfn(info),
				 acpi_meminfo_end_pfn(info), 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_range(acpi_meminfo_start_pfn(info),
			  acpi_meminfo_end_pfn(info), 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
1da177e4	1	/*
0a347644 RW	2	* Copyright (C) 2004, 2013 Intel Corporation
	3	* Author: Naveen B S <[email protected]>
	4	* Author: Rafael J. Wysocki <[email protected]>
1da177e4 LT	5	*
	6	* All rights reserved.
	7	*
	8	* This program is free software; you can redistribute it and/or modify
	9	* it under the terms of the GNU General Public License as published by
	10	* the Free Software Foundation; either version 2 of the License, or (at
	11	* your option) any later version.
	12	*
	13	* This program is distributed in the hope that it will be useful, but
	14	* WITHOUT ANY WARRANTY; without even the implied warranty of
	15	* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
	16	* NON INFRINGEMENT. See the GNU General Public License for more
	17	* details.
	18	*
1da177e4	19	* ACPI based HotPlug driver that supports Memory Hotplug
c7060d9e	20	* This driver fields notifications from firmware for memory add
1da177e4 LT	21	* and remove operations and alerts the VM of the affected memory
	22	* ranges.
	23	*/
	24
ab6c5709	25	#include <linux/acpi.h>
e2ff3940	26	#include <linux/memory.h>
0a347644 RW	27	#include <linux/memory_hotplug.h>
	28
	29	#include "internal.h"
1da177e4	30
1da177e4 LT	31	#define ACPI_MEMORY_DEVICE_CLASS "memory"
1da177e4 LT	32	#define ACPI_MEMORY_DEVICE_HID "PNP0C80"
1da177e4 LT	33	#define ACPI_MEMORY_DEVICE_NAME "Hotplug Mem Device"
	34
	35	#define _COMPONENT ACPI_MEMORY_DEVICE_COMPONENT
	36
aa7b2b2e ZY	37	#undef PREFIX
	38	#define PREFIX "ACPI:memory_hp:"
	39
f52fd66d	40	ACPI_MODULE_NAME("acpi_memhotplug");
1da177e4	41
cccd4208 RW	42	static const struct acpi_device_id memory_device_ids[] = {
	43	{ACPI_MEMORY_DEVICE_HID, 0},
	44	{"", 0},
	45	};
	46
	47	#ifdef CONFIG_ACPI_HOTPLUG_MEMORY
	48
1da177e4 LT	49	/* Memory Device States */
	50	#define MEMORY_INVALID_STATE 0
	51	#define MEMORY_POWER_ON_STATE 1
	52	#define MEMORY_POWER_OFF_STATE 2
	53
0a347644 RW	54	static int acpi_memory_device_add(struct acpi_device *device,
	55	const struct acpi_device_id *not_used);
	56	static void acpi_memory_device_remove(struct acpi_device *device);
1da177e4	57
0a347644	58	static struct acpi_scan_handler memory_device_handler = {
1ba90e3a	59	.ids = memory_device_ids,
0a347644 RW	60	.attach = acpi_memory_device_add,
	61	.detach = acpi_memory_device_remove,
	62	.hotplug = {
	63	.enabled = true,
	64	},
1da177e4 LT	65	};
1da177e4 LT	66
9ac02398 KH	67	struct acpi_memory_info {
	68	struct list_head list;
	69	u64 start_addr; /* Memory Range start physical addr */
	70	u64 length; /* Memory Range length */
	71	unsigned short caching; /* memory cache attribute */
	72	unsigned short write_protect; /* memory read/write attribute */
	73	unsigned int enabled:1;
	74	};
	75
1da177e4	76	struct acpi_memory_device {
3b74863d	77	struct acpi_device * device;
4be44fcd	78	unsigned int state; /* State of the memory device */
9ac02398	79	struct list_head res_list;
1da177e4 LT	80	};
1da177e4 LT	81
9ac02398 KH	82	static acpi_status
	83	acpi_memory_get_resource(struct acpi_resource resource, void context)
	84	{
	85	struct acpi_memory_device *mem_device = context;
	86	struct acpi_resource_address64 address64;
	87	struct acpi_memory_info info, new;
	88	acpi_status status;
	89
	90	status = acpi_resource_to_address64(resource, &address64);
	91	if (ACPI_FAILURE(status) \|\|
	92	(address64.resource_type != ACPI_MEMORY_RANGE))
	93	return AE_OK;
	94
	95	list_for_each_entry(info, &mem_device->res_list, list) {
	96	/* Can we combine the resource range information? */
	97	if ((info->caching == address64.info.mem.caching) &&
	98	(info->write_protect == address64.info.mem.write_protect) &&
a45de93e LZ	99	(info->start_addr + info->length == address64.address.minimum)) {
a45de93e LZ	100	info->length += address64.address.address_length;
9ac02398 KH	101	return AE_OK;
	102	}
	103	}
	104
	105	new = kzalloc(sizeof(struct acpi_memory_info), GFP_KERNEL);
	106	if (!new)
	107	return AE_ERROR;
	108
	109	INIT_LIST_HEAD(&new->list);
	110	new->caching = address64.info.mem.caching;
	111	new->write_protect = address64.info.mem.write_protect;
a45de93e LZ	112	new->start_addr = address64.address.minimum;
a45de93e LZ	113	new->length = address64.address.address_length;
9ac02398 KH	114	list_add_tail(&new->list, &mem_device->res_list);
	115
	116	return AE_OK;
	117	}
	118
386e52b9 WC	119	static void
	120	acpi_memory_free_device_resources(struct acpi_memory_device *mem_device)
	121	{
	122	struct acpi_memory_info info, n;
	123
	124	list_for_each_entry_safe(info, n, &mem_device->res_list, list)
	125	kfree(info);
	126	INIT_LIST_HEAD(&mem_device->res_list);
	127	}
	128
1da177e4 LT	129	static int
	130	acpi_memory_get_device_resources(struct acpi_memory_device *mem_device)
	131	{
	132	acpi_status status;
1da177e4	133
5d2870fa KH	134	if (!list_empty(&mem_device->res_list))
	135	return 0;
	136
b8632785	137	status = acpi_walk_resources(mem_device->device->handle, METHOD_NAME__CRS,
9ac02398 KH	138	acpi_memory_get_resource, mem_device);
9ac02398 KH	139	if (ACPI_FAILURE(status)) {
386e52b9	140	acpi_memory_free_device_resources(mem_device);
d550d98d	141	return -EINVAL;
1da177e4 LT	142	}
1da177e4 LT	143
d550d98d	144	return 0;
1da177e4 LT	145	}
1da177e4 LT	146
4be44fcd	147	static int acpi_memory_check_device(struct acpi_memory_device *mem_device)
1da177e4	148	{
27663c58	149	unsigned long long current_status;
1da177e4 LT	150
1da177e4 LT	151	/* Get device present/absent information from the _STA */
16ff816d ZY	152	if (ACPI_FAILURE(acpi_evaluate_integer(mem_device->device->handle,
	153	METHOD_NAME__STA, NULL,
	154	&current_status)))
d550d98d	155	return -ENODEV;
1da177e4 LT	156	/*
	157	* Check for device status. Device should be
	158	* present/enabled/functioning.
	159	*/
a0bd4ac4 BH	160	if (!((current_status & ACPI_STA_DEVICE_PRESENT)
	161	&& (current_status & ACPI_STA_DEVICE_ENABLED)
	162	&& (current_status & ACPI_STA_DEVICE_FUNCTIONING)))
d550d98d	163	return -ENODEV;
1da177e4	164
d550d98d	165	return 0;
1da177e4 LT	166	}
1da177e4 LT	167
e2ff3940 RW	168	static unsigned long acpi_meminfo_start_pfn(struct acpi_memory_info *info)
	169	{
	170	return PFN_DOWN(info->start_addr);
	171	}
	172
	173	static unsigned long acpi_meminfo_end_pfn(struct acpi_memory_info *info)
	174	{
	175	return PFN_UP(info->start_addr + info->length-1);
	176	}
	177
	178	static int acpi_bind_memblk(struct memory_block mem, void arg)
	179	{
24dee1fc	180	return acpi_bind_one(&mem->dev, arg);
e2ff3940 RW	181	}
	182
	183	static int acpi_bind_memory_blocks(struct acpi_memory_info *info,
24dee1fc	184	struct acpi_device *adev)
e2ff3940 RW	185	{
e2ff3940 RW	186	return walk_memory_range(acpi_meminfo_start_pfn(info),
24dee1fc	187	acpi_meminfo_end_pfn(info), adev,
e2ff3940 RW	188	acpi_bind_memblk);
	189	}
	190
	191	static int acpi_unbind_memblk(struct memory_block mem, void arg)
	192	{
	193	acpi_unbind_one(&mem->dev);
	194	return 0;
	195	}
	196
24dee1fc	197	static void acpi_unbind_memory_blocks(struct acpi_memory_info *info)
e2ff3940 RW	198	{
	199	walk_memory_range(acpi_meminfo_start_pfn(info),
	200	acpi_meminfo_end_pfn(info), NULL, acpi_unbind_memblk);
	201	}
	202
4be44fcd	203	static int acpi_memory_enable_device(struct acpi_memory_device *mem_device)
1da177e4	204	{
e2ff3940	205	acpi_handle handle = mem_device->device->handle;
9ac02398 KH	206	int result, num_enabled = 0;
9ac02398 KH	207	struct acpi_memory_info *info;
1e3590e2	208	int node;
1da177e4	209
e2ff3940	210	node = acpi_get_node(handle);
1da177e4 LT	211	/*
	212	* Tell the VM there is more memory here...
	213	* Note: Assume that this function returns zero on success
9ac02398 KH	214	* We don't have memory-hot-add rollback function,now.
9ac02398 KH	215	* (i.e. memory-hot-remove function)
1da177e4	216	*/
9ac02398	217	list_for_each_entry(info, &mem_device->res_list, list) {
fa25d8d6	218	if (info->enabled) { /* just sanity check...*/
dd56a8e3 YG	219	num_enabled++;
	220	continue;
	221	}
5d2619fc ZY	222	/*
	223	* If the memory block size is zero, please ignore it.
	224	* Don't try to do the following memory hotplug flowchart.
	225	*/
	226	if (!info->length)
	227	continue;
8c2676a5 KM	228	if (node < 0)
	229	node = memory_add_physaddr_to_nid(info->start_addr);
	230
bc02af93	231	result = add_memory(node, info->start_addr, info->length);
65479472 WC	232
	233	/*
	234	* If the memory block has been used by the kernel, add_memory()
	235	* returns -EEXIST. If add_memory() returns the other error, it
	236	* means that this memory block is not used by the kernel.
	237	*/
fd4655c2	238	if (result && result != -EEXIST)
9ac02398	239	continue;
65479472	240
24dee1fc	241	result = acpi_bind_memory_blocks(info, mem_device->device);
e2ff3940	242	if (result) {
24dee1fc	243	acpi_unbind_memory_blocks(info);
e2ff3940 RW	244	return -ENODEV;
	245	}
	246
bb49d82d YI	247	info->enabled = 1;
bb49d82d YI	248
65479472 WC	249	/*
	250	* Add num_enable even if add_memory() returns -EEXIST, so the
	251	* device is bound to this driver.
	252	*/
9ac02398 KH	253	num_enabled++;
	254	}
	255	if (!num_enabled) {
ab6c5709	256	dev_err(&mem_device->device->dev, "add_memory failed\n");
1da177e4	257	mem_device->state = MEMORY_INVALID_STATE;
9ac02398	258	return -EINVAL;
1da177e4	259	}
5d2619fc ZY	260	/*
	261	* Sometimes the memory device will contain several memory blocks.
	262	* When one memory block is hot-added to the system memory, it will
	263	* be regarded as a success.
	264	* Otherwise if the last memory block can't be hot-added to the system
	265	* memory, it will be failure and the memory device can't be bound with
	266	* driver.
	267	*/
	268	return 0;
1da177e4 LT	269	}
1da177e4 LT	270
242831eb	271	static void acpi_memory_remove_memory(struct acpi_memory_device *mem_device)
1da177e4	272	{
e2ff3940	273	acpi_handle handle = mem_device->device->handle;
9ac02398	274	struct acpi_memory_info info, n;
242831eb	275	int nid = acpi_get_node(handle);
60a5a19e	276
9ac02398	277	list_for_each_entry_safe(info, n, &mem_device->res_list, list) {
65479472	278	if (!info->enabled)
fd4655c2	279	continue;
65479472	280
1bb25df0	281	if (nid == NUMA_NO_NODE)
60a5a19e	282	nid = memory_add_physaddr_to_nid(info->start_addr);
e2ff3940	283
24dee1fc	284	acpi_unbind_memory_blocks(info);
242831eb	285	remove_memory(nid, info->start_addr, info->length);
19387b27	286	list_del(&info->list);
9ac02398	287	kfree(info);
1da177e4	288	}
19387b27 YI	289	}
19387b27 YI	290
386e52b9 WC	291	static void acpi_memory_device_free(struct acpi_memory_device *mem_device)
	292	{
	293	if (!mem_device)
	294	return;
	295
	296	acpi_memory_free_device_resources(mem_device);
0a347644	297	mem_device->device->driver_data = NULL;
386e52b9 WC	298	kfree(mem_device);
	299	}
	300
0a347644 RW	301	static int acpi_memory_device_add(struct acpi_device *device,
0a347644 RW	302	const struct acpi_device_id *not_used)
1da177e4	303	{
0a347644	304	struct acpi_memory_device *mem_device;
1da177e4	305	int result;
1da177e4 LT	306
1da177e4 LT	307	if (!device)
d550d98d	308	return -EINVAL;
1da177e4	309
36bcbec7	310	mem_device = kzalloc(sizeof(struct acpi_memory_device), GFP_KERNEL);
1da177e4	311	if (!mem_device)
d550d98d	312	return -ENOMEM;
1da177e4	313
9ac02398	314	INIT_LIST_HEAD(&mem_device->res_list);
3b74863d	315	mem_device->device = device;
1da177e4 LT	316	sprintf(acpi_device_name(device), "%s", ACPI_MEMORY_DEVICE_NAME);
1da177e4 LT	317	sprintf(acpi_device_class(device), "%s", ACPI_MEMORY_DEVICE_CLASS);
db89b4f0	318	device->driver_data = mem_device;
1da177e4 LT	319
	320	/* Get the range from the _CRS */
	321	result = acpi_memory_get_device_resources(mem_device);
	322	if (result) {
d19f503e	323	device->driver_data = NULL;
1da177e4	324	kfree(mem_device);
d550d98d	325	return result;
1da177e4 LT	326	}
	327
	328	/* Set the device state */
	329	mem_device->state = MEMORY_POWER_ON_STATE;
	330
0a347644 RW	331	result = acpi_memory_check_device(mem_device);
	332	if (result) {
	333	acpi_memory_device_free(mem_device);
	334	return 0;
	335	}
1da177e4	336
0a347644 RW	337	result = acpi_memory_enable_device(mem_device);
	338	if (result) {
	339	dev_err(&device->dev, "acpi_memory_enable_device() error\n");
	340	acpi_memory_device_free(mem_device);
e2ff3940	341	return result;
1f425994	342	}
0a347644 RW	343
	344	dev_dbg(&device->dev, "Memory device configured by ACPI\n");
	345	return 1;
1f425994 YG	346	}
1f425994 YG	347
0a347644	348	static void acpi_memory_device_remove(struct acpi_device *device)
80f20fef	349	{
0a347644	350	struct acpi_memory_device *mem_device;
80f20fef BH	351
80f20fef BH	352	if (!device \|\| !acpi_driver_data(device))
0a347644	353	return;
80f20fef BH	354
80f20fef BH	355	mem_device = acpi_driver_data(device);
0a347644	356	acpi_memory_remove_memory(mem_device);
386e52b9	357	acpi_memory_device_free(mem_device);
1da177e4 LT	358	}
1da177e4 LT	359
00159a20 PB	360	static bool __initdata acpi_no_memhotplug;
00159a20 PB	361
0a347644	362	void __init acpi_memory_hotplug_init(void)
1da177e4	363	{
cccd4208 RW	364	if (acpi_no_memhotplug) {
	365	memory_device_handler.attach = NULL;
	366	acpi_scan_add_handler(&memory_device_handler);
00159a20	367	return;
cccd4208	368	}
0a347644	369	acpi_scan_add_handler_with_hotplug(&memory_device_handler, "memory");
1da177e4	370	}
00159a20 PB	371
	372	static int __init disable_acpi_memory_hotplug(char *str)
	373	{
	374	acpi_no_memhotplug = true;
	375	return 1;
	376	}
	377	__setup("acpi_no_memhotplug", disable_acpi_memory_hotplug);
cccd4208 RW	378
	379	#else
	380
	381	static struct acpi_scan_handler memory_device_handler = {
	382	.ids = memory_device_ids,
	383	};
	384
	385	void __init acpi_memory_hotplug_init(void)
	386	{
	387	acpi_scan_add_handler(&memory_device_handler);
	388	}
	389
	390	#endif /* CONFIG_ACPI_HOTPLUG_MEMORY */