[mirror_ubuntu-artful-kernel.git] / drivers / acpi / acpi_memhotplug.c

/*
 * 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.
 *
 * 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 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");

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

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.minimum)) {
			info->length += address64.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.minimum;
	new->length = address64.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, (acpi_handle)arg);
}

static int acpi_bind_memory_blocks(struct acpi_memory_info *info,
				   acpi_handle handle)
{
	return walk_memory_range(acpi_meminfo_start_pfn(info),
				 acpi_meminfo_end_pfn(info), (void *)handle,
				 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,
				      acpi_handle handle)
{
	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, handle);
		if (result) {
			acpi_unbind_memory_blocks(info, handle);
			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, handle);
		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);
}

void __init acpi_memory_hotplug_init(void)
{
	acpi_scan_add_handler_with_hotplug(&memory_device_handler, "memory");
}
Commit	Line	Data
1da177e4	1	/*
0a347644 RW	2	* Copyright (C) 2004, 2013 Intel Corporation
	3	* Author: Naveen B S <naveen.b.s@intel.com>
	4	* Author: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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	*
	19	* You should have received a copy of the GNU General Public License
	20	* along with this program; if not, write to the Free Software
	21	* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	22	*
	23	*
	24	* ACPI based HotPlug driver that supports Memory Hotplug
c7060d9e	25	* This driver fields notifications from firmware for memory add
1da177e4 LT	26	* and remove operations and alerts the VM of the affected memory
	27	* ranges.
	28	*/
	29
ab6c5709	30	#include <linux/acpi.h>
e2ff3940	31	#include <linux/memory.h>
0a347644 RW	32	#include <linux/memory_hotplug.h>
	33
	34	#include "internal.h"
1da177e4	35
1da177e4 LT	36	#define ACPI_MEMORY_DEVICE_CLASS "memory"
1da177e4 LT	37	#define ACPI_MEMORY_DEVICE_HID "PNP0C80"
1da177e4 LT	38	#define ACPI_MEMORY_DEVICE_NAME "Hotplug Mem Device"
	39
	40	#define _COMPONENT ACPI_MEMORY_DEVICE_COMPONENT
	41
aa7b2b2e ZY	42	#undef PREFIX
	43	#define PREFIX "ACPI:memory_hp:"
	44
f52fd66d	45	ACPI_MODULE_NAME("acpi_memhotplug");
1da177e4	46
1da177e4 LT	47	/* Memory Device States */
	48	#define MEMORY_INVALID_STATE 0
	49	#define MEMORY_POWER_ON_STATE 1
	50	#define MEMORY_POWER_OFF_STATE 2
	51
0a347644 RW	52	static int acpi_memory_device_add(struct acpi_device *device,
	53	const struct acpi_device_id *not_used);
	54	static void acpi_memory_device_remove(struct acpi_device *device);
1da177e4	55
1ba90e3a TR	56	static const struct acpi_device_id memory_device_ids[] = {
	57	{ACPI_MEMORY_DEVICE_HID, 0},
	58	{"", 0},
	59	};
1ba90e3a	60
0a347644	61	static struct acpi_scan_handler memory_device_handler = {
1ba90e3a	62	.ids = memory_device_ids,
0a347644 RW	63	.attach = acpi_memory_device_add,
	64	.detach = acpi_memory_device_remove,
	65	.hotplug = {
	66	.enabled = true,
	67	},
1da177e4 LT	68	};
1da177e4 LT	69
9ac02398 KH	70	struct acpi_memory_info {
	71	struct list_head list;
	72	u64 start_addr; /* Memory Range start physical addr */
	73	u64 length; /* Memory Range length */
	74	unsigned short caching; /* memory cache attribute */
	75	unsigned short write_protect; /* memory read/write attribute */
	76	unsigned int enabled:1;
	77	};
	78
1da177e4	79	struct acpi_memory_device {
3b74863d	80	struct acpi_device * device;
4be44fcd	81	unsigned int state; /* State of the memory device */
9ac02398	82	struct list_head res_list;
1da177e4 LT	83	};
1da177e4 LT	84
9ac02398 KH	85	static acpi_status
	86	acpi_memory_get_resource(struct acpi_resource resource, void context)
	87	{
	88	struct acpi_memory_device *mem_device = context;
	89	struct acpi_resource_address64 address64;
	90	struct acpi_memory_info info, new;
	91	acpi_status status;
	92
	93	status = acpi_resource_to_address64(resource, &address64);
	94	if (ACPI_FAILURE(status) \|\|
	95	(address64.resource_type != ACPI_MEMORY_RANGE))
	96	return AE_OK;
	97
	98	list_for_each_entry(info, &mem_device->res_list, list) {
	99	/* Can we combine the resource range information? */
	100	if ((info->caching == address64.info.mem.caching) &&
	101	(info->write_protect == address64.info.mem.write_protect) &&
	102	(info->start_addr + info->length == address64.minimum)) {
	103	info->length += address64.address_length;
	104	return AE_OK;
	105	}
	106	}
	107
	108	new = kzalloc(sizeof(struct acpi_memory_info), GFP_KERNEL);
	109	if (!new)
	110	return AE_ERROR;
	111
	112	INIT_LIST_HEAD(&new->list);
	113	new->caching = address64.info.mem.caching;
	114	new->write_protect = address64.info.mem.write_protect;
	115	new->start_addr = address64.minimum;
	116	new->length = address64.address_length;
	117	list_add_tail(&new->list, &mem_device->res_list);
	118
	119	return AE_OK;
	120	}
	121
386e52b9 WC	122	static void
	123	acpi_memory_free_device_resources(struct acpi_memory_device *mem_device)
	124	{
	125	struct acpi_memory_info info, n;
	126
	127	list_for_each_entry_safe(info, n, &mem_device->res_list, list)
	128	kfree(info);
	129	INIT_LIST_HEAD(&mem_device->res_list);
	130	}
	131
1da177e4 LT	132	static int
	133	acpi_memory_get_device_resources(struct acpi_memory_device *mem_device)
	134	{
	135	acpi_status status;
1da177e4	136
5d2870fa KH	137	if (!list_empty(&mem_device->res_list))
	138	return 0;
	139
b8632785	140	status = acpi_walk_resources(mem_device->device->handle, METHOD_NAME__CRS,
9ac02398 KH	141	acpi_memory_get_resource, mem_device);
9ac02398 KH	142	if (ACPI_FAILURE(status)) {
386e52b9	143	acpi_memory_free_device_resources(mem_device);
d550d98d	144	return -EINVAL;
1da177e4 LT	145	}
1da177e4 LT	146
d550d98d	147	return 0;
1da177e4 LT	148	}
1da177e4 LT	149
4be44fcd	150	static int acpi_memory_check_device(struct acpi_memory_device *mem_device)
1da177e4	151	{
27663c58	152	unsigned long long current_status;
1da177e4 LT	153
1da177e4 LT	154	/* Get device present/absent information from the _STA */
16ff816d ZY	155	if (ACPI_FAILURE(acpi_evaluate_integer(mem_device->device->handle,
	156	METHOD_NAME__STA, NULL,
	157	&current_status)))
d550d98d	158	return -ENODEV;
1da177e4 LT	159	/*
	160	* Check for device status. Device should be
	161	* present/enabled/functioning.
	162	*/
a0bd4ac4 BH	163	if (!((current_status & ACPI_STA_DEVICE_PRESENT)
	164	&& (current_status & ACPI_STA_DEVICE_ENABLED)
	165	&& (current_status & ACPI_STA_DEVICE_FUNCTIONING)))
d550d98d	166	return -ENODEV;
1da177e4	167
d550d98d	168	return 0;
1da177e4 LT	169	}
1da177e4 LT	170
e2ff3940 RW	171	static unsigned long acpi_meminfo_start_pfn(struct acpi_memory_info *info)
	172	{
	173	return PFN_DOWN(info->start_addr);
	174	}
	175
	176	static unsigned long acpi_meminfo_end_pfn(struct acpi_memory_info *info)
	177	{
	178	return PFN_UP(info->start_addr + info->length-1);
	179	}
	180
	181	static int acpi_bind_memblk(struct memory_block mem, void arg)
	182	{
	183	return acpi_bind_one(&mem->dev, (acpi_handle)arg);
	184	}
	185
	186	static int acpi_bind_memory_blocks(struct acpi_memory_info *info,
	187	acpi_handle handle)
	188	{
	189	return walk_memory_range(acpi_meminfo_start_pfn(info),
	190	acpi_meminfo_end_pfn(info), (void *)handle,
	191	acpi_bind_memblk);
	192	}
	193
	194	static int acpi_unbind_memblk(struct memory_block mem, void arg)
	195	{
	196	acpi_unbind_one(&mem->dev);
	197	return 0;
	198	}
	199
	200	static void acpi_unbind_memory_blocks(struct acpi_memory_info *info,
	201	acpi_handle handle)
	202	{
	203	walk_memory_range(acpi_meminfo_start_pfn(info),
	204	acpi_meminfo_end_pfn(info), NULL, acpi_unbind_memblk);
	205	}
	206
4be44fcd	207	static int acpi_memory_enable_device(struct acpi_memory_device *mem_device)
1da177e4	208	{
e2ff3940	209	acpi_handle handle = mem_device->device->handle;
9ac02398 KH	210	int result, num_enabled = 0;
9ac02398 KH	211	struct acpi_memory_info *info;
1e3590e2	212	int node;
1da177e4	213
e2ff3940	214	node = acpi_get_node(handle);
1da177e4 LT	215	/*
	216	* Tell the VM there is more memory here...
	217	* Note: Assume that this function returns zero on success
9ac02398 KH	218	* We don't have memory-hot-add rollback function,now.
9ac02398 KH	219	* (i.e. memory-hot-remove function)
1da177e4	220	*/
9ac02398	221	list_for_each_entry(info, &mem_device->res_list, list) {
fa25d8d6	222	if (info->enabled) { /* just sanity check...*/
dd56a8e3 YG	223	num_enabled++;
	224	continue;
	225	}
5d2619fc ZY	226	/*
	227	* If the memory block size is zero, please ignore it.
	228	* Don't try to do the following memory hotplug flowchart.
	229	*/
	230	if (!info->length)
	231	continue;
8c2676a5 KM	232	if (node < 0)
	233	node = memory_add_physaddr_to_nid(info->start_addr);
	234
bc02af93	235	result = add_memory(node, info->start_addr, info->length);
65479472 WC	236
	237	/*
	238	* If the memory block has been used by the kernel, add_memory()
	239	* returns -EEXIST. If add_memory() returns the other error, it
	240	* means that this memory block is not used by the kernel.
	241	*/
fd4655c2	242	if (result && result != -EEXIST)
9ac02398	243	continue;
65479472	244
e2ff3940 RW	245	result = acpi_bind_memory_blocks(info, handle);
	246	if (result) {
	247	acpi_unbind_memory_blocks(info, handle);
	248	return -ENODEV;
	249	}
	250
bb49d82d YI	251	info->enabled = 1;
bb49d82d YI	252
65479472 WC	253	/*
	254	* Add num_enable even if add_memory() returns -EEXIST, so the
	255	* device is bound to this driver.
	256	*/
9ac02398 KH	257	num_enabled++;
	258	}
	259	if (!num_enabled) {
ab6c5709	260	dev_err(&mem_device->device->dev, "add_memory failed\n");
1da177e4	261	mem_device->state = MEMORY_INVALID_STATE;
9ac02398	262	return -EINVAL;
1da177e4	263	}
5d2619fc ZY	264	/*
	265	* Sometimes the memory device will contain several memory blocks.
	266	* When one memory block is hot-added to the system memory, it will
	267	* be regarded as a success.
	268	* Otherwise if the last memory block can't be hot-added to the system
	269	* memory, it will be failure and the memory device can't be bound with
	270	* driver.
	271	*/
	272	return 0;
1da177e4 LT	273	}
1da177e4 LT	274
242831eb	275	static void acpi_memory_remove_memory(struct acpi_memory_device *mem_device)
1da177e4	276	{
e2ff3940	277	acpi_handle handle = mem_device->device->handle;
9ac02398	278	struct acpi_memory_info info, n;
242831eb	279	int nid = acpi_get_node(handle);
60a5a19e	280
9ac02398	281	list_for_each_entry_safe(info, n, &mem_device->res_list, list) {
65479472	282	if (!info->enabled)
fd4655c2	283	continue;
65479472	284
1bb25df0	285	if (nid == NUMA_NO_NODE)
60a5a19e	286	nid = memory_add_physaddr_to_nid(info->start_addr);
e2ff3940 RW	287
e2ff3940 RW	288	acpi_unbind_memory_blocks(info, handle);
242831eb	289	remove_memory(nid, info->start_addr, info->length);
19387b27	290	list_del(&info->list);
9ac02398	291	kfree(info);
1da177e4	292	}
19387b27 YI	293	}
19387b27 YI	294
386e52b9 WC	295	static void acpi_memory_device_free(struct acpi_memory_device *mem_device)
	296	{
	297	if (!mem_device)
	298	return;
	299
	300	acpi_memory_free_device_resources(mem_device);
0a347644	301	mem_device->device->driver_data = NULL;
386e52b9 WC	302	kfree(mem_device);
	303	}
	304
0a347644 RW	305	static int acpi_memory_device_add(struct acpi_device *device,
0a347644 RW	306	const struct acpi_device_id *not_used)
1da177e4	307	{
0a347644	308	struct acpi_memory_device *mem_device;
1da177e4	309	int result;
1da177e4 LT	310
1da177e4 LT	311	if (!device)
d550d98d	312	return -EINVAL;
1da177e4	313
36bcbec7	314	mem_device = kzalloc(sizeof(struct acpi_memory_device), GFP_KERNEL);
1da177e4	315	if (!mem_device)
d550d98d	316	return -ENOMEM;
1da177e4	317
9ac02398	318	INIT_LIST_HEAD(&mem_device->res_list);
3b74863d	319	mem_device->device = device;
1da177e4 LT	320	sprintf(acpi_device_name(device), "%s", ACPI_MEMORY_DEVICE_NAME);
1da177e4 LT	321	sprintf(acpi_device_class(device), "%s", ACPI_MEMORY_DEVICE_CLASS);
db89b4f0	322	device->driver_data = mem_device;
1da177e4 LT	323
	324	/* Get the range from the _CRS */
	325	result = acpi_memory_get_device_resources(mem_device);
	326	if (result) {
d19f503e	327	device->driver_data = NULL;
1da177e4	328	kfree(mem_device);
d550d98d	329	return result;
1da177e4 LT	330	}
	331
	332	/* Set the device state */
	333	mem_device->state = MEMORY_POWER_ON_STATE;
	334
0a347644 RW	335	result = acpi_memory_check_device(mem_device);
	336	if (result) {
	337	acpi_memory_device_free(mem_device);
	338	return 0;
	339	}
1da177e4	340
0a347644 RW	341	result = acpi_memory_enable_device(mem_device);
	342	if (result) {
	343	dev_err(&device->dev, "acpi_memory_enable_device() error\n");
	344	acpi_memory_device_free(mem_device);
e2ff3940	345	return result;
1f425994	346	}
0a347644 RW	347
	348	dev_dbg(&device->dev, "Memory device configured by ACPI\n");
	349	return 1;
1f425994 YG	350	}
1f425994 YG	351
0a347644	352	static void acpi_memory_device_remove(struct acpi_device *device)
80f20fef	353	{
0a347644	354	struct acpi_memory_device *mem_device;
80f20fef BH	355
80f20fef BH	356	if (!device \|\| !acpi_driver_data(device))
0a347644	357	return;
80f20fef BH	358
80f20fef BH	359	mem_device = acpi_driver_data(device);
0a347644	360	acpi_memory_remove_memory(mem_device);
386e52b9	361	acpi_memory_device_free(mem_device);
1da177e4 LT	362	}
1da177e4 LT	363
0a347644	364	void __init acpi_memory_hotplug_init(void)
1da177e4	365	{
0a347644	366	acpi_scan_add_handler_with_hotplug(&memory_device_handler, "memory");
1da177e4	367	}