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) 2012 Intel Corporation
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  *    Author: Liu Jinsong <jinsong.liu@intel.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  *    Author: Jiang Yunhong <yunhong.jiang@intel.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8) #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <linux/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <linux/acpi.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include <xen/acpi.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include <xen/interface/platform.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #include <asm/xen/hypercall.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) #define PREFIX "ACPI:xen_memory_hotplug:"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) struct acpi_memory_info {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) 	struct list_head list;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) 	u64 start_addr;		/* Memory Range start physical addr */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) 	u64 length;		/* Memory Range length */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) 	unsigned short caching;	/* memory cache attribute */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) 	unsigned short write_protect;	/* memory read/write attribute */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) 				/* copied from buffer getting from _CRS */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) 	unsigned int enabled:1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) struct acpi_memory_device {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) 	struct acpi_device *device;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) 	struct list_head res_list;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) static bool acpi_hotmem_initialized __read_mostly;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) static int xen_hotadd_memory(int pxm, struct acpi_memory_info *info)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 	int rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 	struct xen_platform_op op;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 	op.cmd = XENPF_mem_hotadd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 	op.u.mem_add.spfn = info->start_addr >> PAGE_SHIFT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 	op.u.mem_add.epfn = (info->start_addr + info->length) >> PAGE_SHIFT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 	op.u.mem_add.pxm = pxm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 	rc = HYPERVISOR_dom0_op(&op);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 	if (rc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 		pr_err(PREFIX "Xen Hotplug Memory Add failed on "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 			"0x%lx -> 0x%lx, _PXM: %d, error: %d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 			(unsigned long)info->start_addr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 			(unsigned long)(info->start_addr + info->length),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 			pxm, rc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 	return rc;
^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 int xen_acpi_memory_enable_device(struct acpi_memory_device *mem_device)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 	int pxm, result;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 	int num_enabled = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 	struct acpi_memory_info *info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 	if (!mem_device)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 	pxm = xen_acpi_get_pxm(mem_device->device->handle);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 	if (pxm < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 		return pxm;
^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) 		if (info->enabled) { /* just sanity check...*/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 			num_enabled++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 			continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 		if (!info->length)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 			continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 		result = xen_hotadd_memory(pxm, info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 		if (result)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 			continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 		info->enabled = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 		num_enabled++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 	if (!num_enabled)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 		return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) static acpi_status
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) acpi_memory_get_resource(struct acpi_resource *resource, void *context)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 	struct acpi_memory_device *mem_device = context;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 	struct acpi_resource_address64 address64;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 	struct acpi_memory_info *info, *new;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 	acpi_status status;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 	status = acpi_resource_to_address64(resource, &address64);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 	if (ACPI_FAILURE(status) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 	    (address64.resource_type != ACPI_MEMORY_RANGE))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 		return AE_OK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 	list_for_each_entry(info, &mem_device->res_list, list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 		if ((info->caching == address64.info.mem.caching) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 		    (info->write_protect == address64.info.mem.write_protect) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 		    (info->start_addr + info->length == address64.address.minimum)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 			info->length += address64.address.address_length;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 			return AE_OK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 	new = kzalloc(sizeof(struct acpi_memory_info), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 	if (!new)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 		return AE_ERROR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 	INIT_LIST_HEAD(&new->list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 	new->caching = address64.info.mem.caching;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 	new->write_protect = address64.info.mem.write_protect;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 	new->start_addr = address64.address.minimum;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 	new->length = address64.address.address_length;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 	list_add_tail(&new->list, &mem_device->res_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 	return AE_OK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) static int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) acpi_memory_get_device_resources(struct acpi_memory_device *mem_device)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 	acpi_status status;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 	struct acpi_memory_info *info, *n;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 	if (!list_empty(&mem_device->res_list))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 	status = acpi_walk_resources(mem_device->device->handle,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 		METHOD_NAME__CRS, acpi_memory_get_resource, mem_device);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 	if (ACPI_FAILURE(status)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 		list_for_each_entry_safe(info, n, &mem_device->res_list, list)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 			kfree(info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 		INIT_LIST_HEAD(&mem_device->res_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) static int acpi_memory_get_device(acpi_handle handle,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 				  struct acpi_memory_device **mem_device)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 	struct acpi_device *device = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 	int result = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 	acpi_scan_lock_acquire();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 	acpi_bus_get_device(handle, &device);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 	if (acpi_device_enumerated(device))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 		goto end;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 	 * Now add the notified device.  This creates the acpi_device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 	 * and invokes .add function
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 	result = acpi_bus_scan(handle);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 	if (result) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 		pr_warn(PREFIX "ACPI namespace scan failed\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 		result = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 	device = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 	acpi_bus_get_device(handle, &device);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 	if (!acpi_device_enumerated(device)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 		pr_warn(PREFIX "Missing device object\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 		result = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) end:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 	*mem_device = acpi_driver_data(device);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 	if (!(*mem_device)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 		pr_err(PREFIX "driver data not found\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 		result = -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 	acpi_scan_lock_release();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 	return result;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) static int acpi_memory_check_device(struct acpi_memory_device *mem_device)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 	unsigned long long current_status;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 	/* Get device present/absent information from the _STA */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 	if (ACPI_FAILURE(acpi_evaluate_integer(mem_device->device->handle,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 				"_STA", NULL, &current_status)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 		return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 	 * Check for device status. Device should be
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 	 * present/enabled/functioning.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 	if (!((current_status & ACPI_STA_DEVICE_PRESENT)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 	      && (current_status & ACPI_STA_DEVICE_ENABLED)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 	      && (current_status & ACPI_STA_DEVICE_FUNCTIONING)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 		return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) static int acpi_memory_disable_device(struct acpi_memory_device *mem_device)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 	pr_debug(PREFIX "Xen does not support memory hotremove\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 	return -ENOSYS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) static void acpi_memory_device_notify(acpi_handle handle, u32 event, void *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 	struct acpi_memory_device *mem_device;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 	struct acpi_device *device;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 	u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE; /* default */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 	switch (event) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 	case ACPI_NOTIFY_BUS_CHECK:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 			"\nReceived BUS CHECK notification for device\n"));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 		fallthrough;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 	case ACPI_NOTIFY_DEVICE_CHECK:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 		if (event == ACPI_NOTIFY_DEVICE_CHECK)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 			ACPI_DEBUG_PRINT((ACPI_DB_INFO,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 			"\nReceived DEVICE CHECK notification for device\n"));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 		if (acpi_memory_get_device(handle, &mem_device)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 			pr_err(PREFIX "Cannot find driver data\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 		ost_code = ACPI_OST_SC_SUCCESS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 	case ACPI_NOTIFY_EJECT_REQUEST:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 			"\nReceived EJECT REQUEST notification for device\n"));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 		acpi_scan_lock_acquire();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 		if (acpi_bus_get_device(handle, &device)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 			acpi_scan_lock_release();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 			pr_err(PREFIX "Device doesn't exist\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 		mem_device = acpi_driver_data(device);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 		if (!mem_device) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 			acpi_scan_lock_release();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 			pr_err(PREFIX "Driver Data is NULL\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 		/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 		 * TBD: implement acpi_memory_disable_device and invoke
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 		 * acpi_bus_remove if Xen support hotremove in the future
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 		 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 		acpi_memory_disable_device(mem_device);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 		acpi_scan_lock_release();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 	default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 				  "Unsupported event [0x%x]\n", event));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 		/* non-hotplug event; possibly handled by other handler */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 	(void) acpi_evaluate_ost(handle, event, ost_code, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 	return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) static int xen_acpi_memory_device_add(struct acpi_device *device)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 	int result;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) 	struct acpi_memory_device *mem_device = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) 	if (!device)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) 	mem_device = kzalloc(sizeof(struct acpi_memory_device), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) 	if (!mem_device)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) 	INIT_LIST_HEAD(&mem_device->res_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) 	mem_device->device = device;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) 	sprintf(acpi_device_name(device), "%s", ACPI_MEMORY_DEVICE_NAME);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) 	sprintf(acpi_device_class(device), "%s", ACPI_MEMORY_DEVICE_CLASS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) 	device->driver_data = mem_device;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) 	/* Get the range from the _CRS */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) 	result = acpi_memory_get_device_resources(mem_device);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) 	if (result) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) 		kfree(mem_device);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) 		return result;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) 	 * For booting existed memory devices, early boot code has recognized
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) 	 * memory area by EFI/E820. If DSDT shows these memory devices on boot,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) 	 * hotplug is not necessary for them.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) 	 * For hot-added memory devices during runtime, it need hypercall to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) 	 * Xen hypervisor to add memory.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) 	if (!acpi_hotmem_initialized)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) 	if (!acpi_memory_check_device(mem_device))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) 		result = xen_acpi_memory_enable_device(mem_device);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) 	return result;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) static int xen_acpi_memory_device_remove(struct acpi_device *device)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) 	struct acpi_memory_device *mem_device = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) 	if (!device || !acpi_driver_data(device))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) 	mem_device = acpi_driver_data(device);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) 	kfree(mem_device);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338)  * Helper function to check for memory device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) static acpi_status is_memory_device(acpi_handle handle)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) 	char *hardware_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) 	acpi_status status;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) 	struct acpi_device_info *info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) 	status = acpi_get_object_info(handle, &info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) 	if (ACPI_FAILURE(status))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) 		return status;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) 	if (!(info->valid & ACPI_VALID_HID)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) 		kfree(info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) 		return AE_ERROR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) 	hardware_id = info->hardware_id.string;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) 	if ((hardware_id == NULL) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) 	    (strcmp(hardware_id, ACPI_MEMORY_DEVICE_HID)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) 		status = AE_ERROR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) 	kfree(info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) 	return status;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) static acpi_status
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) acpi_memory_register_notify_handler(acpi_handle handle,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) 				    u32 level, void *ctxt, void **retv)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) 	acpi_status status;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) 	status = is_memory_device(handle);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) 	if (ACPI_FAILURE(status))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) 		return AE_OK;	/* continue */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) 	status = acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) 					     acpi_memory_device_notify, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) 	/* continue */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) 	return AE_OK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) static acpi_status
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) acpi_memory_deregister_notify_handler(acpi_handle handle,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) 				      u32 level, void *ctxt, void **retv)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) 	acpi_status status;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) 	status = is_memory_device(handle);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) 	if (ACPI_FAILURE(status))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) 		return AE_OK;	/* continue */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) 	status = acpi_remove_notify_handler(handle,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) 					    ACPI_SYSTEM_NOTIFY,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) 					    acpi_memory_device_notify);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) 	return AE_OK;	/* continue */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) static const struct acpi_device_id memory_device_ids[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) 	{ACPI_MEMORY_DEVICE_HID, 0},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) 	{"", 0},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) MODULE_DEVICE_TABLE(acpi, memory_device_ids);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) static struct acpi_driver xen_acpi_memory_device_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) 	.name = "acpi_memhotplug",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) 	.class = ACPI_MEMORY_DEVICE_CLASS,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) 	.ids = memory_device_ids,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) 	.ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) 		.add = xen_acpi_memory_device_add,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) 		.remove = xen_acpi_memory_device_remove,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) 		},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) static int __init xen_acpi_memory_device_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) 	int result;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) 	acpi_status status;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) 	if (!xen_initial_domain())
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) 		return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) 	/* unregister the stub which only used to reserve driver space */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) 	xen_stub_memory_device_exit();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) 	result = acpi_bus_register_driver(&xen_acpi_memory_device_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) 	if (result < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) 		xen_stub_memory_device_init();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) 		return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) 	status = acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) 				     ACPI_UINT32_MAX,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) 				     acpi_memory_register_notify_handler,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) 				     NULL, NULL, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) 	if (ACPI_FAILURE(status)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) 		pr_warn(PREFIX "walk_namespace failed\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) 		acpi_bus_unregister_driver(&xen_acpi_memory_device_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) 		xen_stub_memory_device_init();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) 		return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) 	acpi_hotmem_initialized = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) static void __exit xen_acpi_memory_device_exit(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) 	acpi_status status;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) 	if (!xen_initial_domain())
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) 	status = acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) 				     ACPI_UINT32_MAX,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) 				     acpi_memory_deregister_notify_handler,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) 				     NULL, NULL, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) 	if (ACPI_FAILURE(status))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458) 		pr_warn(PREFIX "walk_namespace failed\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) 	acpi_bus_unregister_driver(&xen_acpi_memory_device_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463) 	 * stub reserve space again to prevent any chance of native
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) 	 * driver loading.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) 	xen_stub_memory_device_init();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) 	return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) module_init(xen_acpi_memory_device_init);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) module_exit(xen_acpi_memory_device_exit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) ACPI_MODULE_NAME("xen-acpi-memhotplug");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) MODULE_AUTHOR("Liu Jinsong <jinsong.liu@intel.com>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474) MODULE_DESCRIPTION("Xen Hotplug Mem Driver");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) MODULE_LICENSE("GPL");