Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  * Copyright (C) 2004, 2013 Intel Corporation
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  * Author: Naveen B S <naveen.b.s@intel.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  * Author: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7)  * All rights reserved.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9)  * ACPI based HotPlug driver that supports Memory Hotplug
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10)  * This driver fields notifications from firmware for memory add
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11)  * and remove operations and alerts the VM of the affected memory
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12)  * ranges.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include <linux/acpi.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include <linux/memory.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #include <linux/memory_hotplug.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) #include "internal.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) #define ACPI_MEMORY_DEVICE_CLASS		"memory"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) #define ACPI_MEMORY_DEVICE_HID			"PNP0C80"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) #define ACPI_MEMORY_DEVICE_NAME			"Hotplug Mem Device"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) static const struct acpi_device_id memory_device_ids[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) 	{ACPI_MEMORY_DEVICE_HID, 0},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) 	{"", 0},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) #ifdef CONFIG_ACPI_HOTPLUG_MEMORY
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) static int acpi_memory_device_add(struct acpi_device *device,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) 				  const struct acpi_device_id *not_used);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) static void acpi_memory_device_remove(struct acpi_device *device);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) static struct acpi_scan_handler memory_device_handler = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 	.ids = memory_device_ids,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 	.attach = acpi_memory_device_add,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 	.detach = acpi_memory_device_remove,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 	.hotplug = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 		.enabled = true,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 	},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) struct acpi_memory_info {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 	struct list_head list;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 	u64 start_addr;		/* Memory Range start physical addr */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 	u64 length;		/* Memory Range length */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 	unsigned short caching;	/* memory cache attribute */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 	unsigned short write_protect;	/* memory read/write attribute */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 	unsigned int enabled:1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) struct acpi_memory_device {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 	struct acpi_device *device;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 	struct list_head res_list;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) static acpi_status
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) acpi_memory_get_resource(struct acpi_resource *resource, void *context)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 	struct acpi_memory_device *mem_device = context;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 	struct acpi_resource_address64 address64;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 	struct acpi_memory_info *info, *new;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 	acpi_status status;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 	status = acpi_resource_to_address64(resource, &address64);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 	if (ACPI_FAILURE(status) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 	    (address64.resource_type != ACPI_MEMORY_RANGE))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 		return AE_OK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 	list_for_each_entry(info, &mem_device->res_list, list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 		/* Can we combine the resource range information? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 		if ((info->caching == address64.info.mem.caching) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 		    (info->write_protect == address64.info.mem.write_protect) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 		    (info->start_addr + info->length == address64.address.minimum)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 			info->length += address64.address.address_length;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 			return AE_OK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 	new = kzalloc(sizeof(struct acpi_memory_info), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 	if (!new)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 		return AE_ERROR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 	INIT_LIST_HEAD(&new->list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 	new->caching = address64.info.mem.caching;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 	new->write_protect = address64.info.mem.write_protect;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 	new->start_addr = address64.address.minimum;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 	new->length = address64.address.address_length;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 	list_add_tail(&new->list, &mem_device->res_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 	return AE_OK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) static void
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) acpi_memory_free_device_resources(struct acpi_memory_device *mem_device)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 	struct acpi_memory_info *info, *n;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 	list_for_each_entry_safe(info, n, &mem_device->res_list, list)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 		kfree(info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 	INIT_LIST_HEAD(&mem_device->res_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) static int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) acpi_memory_get_device_resources(struct acpi_memory_device *mem_device)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 	acpi_status status;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 	if (!list_empty(&mem_device->res_list))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 	status = acpi_walk_resources(mem_device->device->handle, METHOD_NAME__CRS,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 				     acpi_memory_get_resource, mem_device);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 	if (ACPI_FAILURE(status)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 		acpi_memory_free_device_resources(mem_device);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) static int acpi_memory_check_device(struct acpi_memory_device *mem_device)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 	unsigned long long current_status;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 	/* Get device present/absent information from the _STA */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 	if (ACPI_FAILURE(acpi_evaluate_integer(mem_device->device->handle,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 					       METHOD_NAME__STA, NULL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 					       &current_status)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 		return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 	 * Check for device status. Device should be
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 	 * present/enabled/functioning.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 	if (!((current_status & ACPI_STA_DEVICE_PRESENT)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 	      && (current_status & ACPI_STA_DEVICE_ENABLED)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 	      && (current_status & ACPI_STA_DEVICE_FUNCTIONING)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 		return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) static int acpi_bind_memblk(struct memory_block *mem, void *arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 	return acpi_bind_one(&mem->dev, arg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) static int acpi_bind_memory_blocks(struct acpi_memory_info *info,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 				   struct acpi_device *adev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 	return walk_memory_blocks(info->start_addr, info->length, adev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 				  acpi_bind_memblk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) static int acpi_unbind_memblk(struct memory_block *mem, void *arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 	acpi_unbind_one(&mem->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) static void acpi_unbind_memory_blocks(struct acpi_memory_info *info)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 	walk_memory_blocks(info->start_addr, info->length, NULL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 			   acpi_unbind_memblk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) static int acpi_memory_enable_device(struct acpi_memory_device *mem_device)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 	acpi_handle handle = mem_device->device->handle;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 	int result, num_enabled = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 	struct acpi_memory_info *info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 	int node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 	node = acpi_get_node(handle);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 	 * Tell the VM there is more memory here...
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 	 * Note: Assume that this function returns zero on success
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 	 * We don't have memory-hot-add rollback function,now.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 	 * (i.e. memory-hot-remove function)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 	list_for_each_entry(info, &mem_device->res_list, list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 		if (info->enabled) { /* just sanity check...*/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 			num_enabled++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 			continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 		/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 		 * If the memory block size is zero, please ignore it.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 		 * Don't try to do the following memory hotplug flowchart.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 		 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 		if (!info->length)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 			continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 		if (node < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 			node = memory_add_physaddr_to_nid(info->start_addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 		result = __add_memory(node, info->start_addr, info->length,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 				      MHP_NONE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 		/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 		 * If the memory block has been used by the kernel, add_memory()
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 		 * returns -EEXIST. If add_memory() returns the other error, it
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 		 * means that this memory block is not used by the kernel.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 		 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 		if (result && result != -EEXIST)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 			continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 		result = acpi_bind_memory_blocks(info, mem_device->device);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 		if (result) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 			acpi_unbind_memory_blocks(info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 			return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 		info->enabled = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 		/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 		 * Add num_enable even if add_memory() returns -EEXIST, so the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 		 * device is bound to this driver.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 		 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 		num_enabled++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 	if (!num_enabled) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 		dev_err(&mem_device->device->dev, "add_memory failed\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 	 * Sometimes the memory device will contain several memory blocks.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 	 * When one memory block is hot-added to the system memory, it will
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 	 * be regarded as a success.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 	 * Otherwise if the last memory block can't be hot-added to the system
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 	 * memory, it will be failure and the memory device can't be bound with
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 	 * driver.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) static void acpi_memory_remove_memory(struct acpi_memory_device *mem_device)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 	acpi_handle handle = mem_device->device->handle;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 	struct acpi_memory_info *info, *n;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 	int nid = acpi_get_node(handle);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 	list_for_each_entry_safe(info, n, &mem_device->res_list, list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 		if (!info->enabled)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 			continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 		if (nid == NUMA_NO_NODE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 			nid = memory_add_physaddr_to_nid(info->start_addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 		acpi_unbind_memory_blocks(info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 		__remove_memory(nid, info->start_addr, info->length);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 		list_del(&info->list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 		kfree(info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) static void acpi_memory_device_free(struct acpi_memory_device *mem_device)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 	if (!mem_device)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 	acpi_memory_free_device_resources(mem_device);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 	mem_device->device->driver_data = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 	kfree(mem_device);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) static int acpi_memory_device_add(struct acpi_device *device,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 				  const struct acpi_device_id *not_used)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 	struct acpi_memory_device *mem_device;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 	int result;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 	if (!device)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 	mem_device = kzalloc(sizeof(struct acpi_memory_device), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 	if (!mem_device)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 	INIT_LIST_HEAD(&mem_device->res_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 	mem_device->device = device;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 	sprintf(acpi_device_name(device), "%s", ACPI_MEMORY_DEVICE_NAME);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) 	sprintf(acpi_device_class(device), "%s", ACPI_MEMORY_DEVICE_CLASS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 	device->driver_data = mem_device;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) 	/* Get the range from the _CRS */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) 	result = acpi_memory_get_device_resources(mem_device);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) 	if (result) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) 		device->driver_data = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) 		kfree(mem_device);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) 		return result;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) 	result = acpi_memory_check_device(mem_device);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) 	if (result) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) 		acpi_memory_device_free(mem_device);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) 	result = acpi_memory_enable_device(mem_device);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) 	if (result) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) 		dev_err(&device->dev, "acpi_memory_enable_device() error\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) 		acpi_memory_device_free(mem_device);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) 		return result;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) 	dev_dbg(&device->dev, "Memory device configured by ACPI\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) 	return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) static void acpi_memory_device_remove(struct acpi_device *device)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) 	struct acpi_memory_device *mem_device;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) 	if (!device || !acpi_driver_data(device))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) 	mem_device = acpi_driver_data(device);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) 	acpi_memory_remove_memory(mem_device);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) 	acpi_memory_device_free(mem_device);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) static bool __initdata acpi_no_memhotplug;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) void __init acpi_memory_hotplug_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) 	if (acpi_no_memhotplug) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) 		memory_device_handler.attach = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) 		acpi_scan_add_handler(&memory_device_handler);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) 	acpi_scan_add_handler_with_hotplug(&memory_device_handler, "memory");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) static int __init disable_acpi_memory_hotplug(char *str)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) 	acpi_no_memhotplug = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) 	return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) __setup("acpi_no_memhotplug", disable_acpi_memory_hotplug);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) static struct acpi_scan_handler memory_device_handler = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) 	.ids = memory_device_ids,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) void __init acpi_memory_hotplug_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) 	acpi_scan_add_handler(&memory_device_handler);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) #endif /* CONFIG_ACPI_HOTPLUG_MEMORY */