// SPDX-License-Identifier: GPL-2.0-or-later /* * pseries Memory Hotplug infrastructure. * * Copyright (C) 2008 Badari Pulavarty, IBM Corporation */ #define pr_fmt(fmt) "pseries-hotplug-mem: " fmt #include <linux/of.h> #include <linux/of_address.h> #include <linux/memblock.h> #include <linux/memory.h> #include <linux/memory_hotplug.h> #include <linux/slab.h> #include <asm/firmware.h> #include <asm/machdep.h> #include <asm/prom.h> #include <asm/sparsemem.h> #include <asm/fadump.h> #include <asm/drmem.h> #include "pseries.h" static bool rtas_hp_event; unsigned long pseries_memory_block_size(void) { struct device_node *np; unsigned int memblock_size = MIN_MEMORY_BLOCK_SIZE; struct resource r; np = of_find_node_by_path("/ibm,dynamic-reconfiguration-memory"); if (np) { const __be64 *size; size = of_get_property(np, "ibm,lmb-size", NULL); if (size) memblock_size = be64_to_cpup(size); of_node_put(np); } else if (machine_is(pseries)) { /* This fallback really only applies to pseries */ unsigned int memzero_size = 0; np = of_find_node_by_path("/memory@0"); if (np) { if (!of_address_to_resource(np, 0, &r)) memzero_size = resource_size(&r); of_node_put(np); } if (memzero_size) { /* We now know the size of memory@0, use this to find * the first memoryblock and get its size. */ char buf[64]; sprintf(buf, "/memory@%x", memzero_size); np = of_find_node_by_path(buf); if (np) { if (!of_address_to_resource(np, 0, &r)) memblock_size = resource_size(&r); of_node_put(np); } } } return memblock_size; } static void dlpar_free_property(struct property *prop) { kfree(prop->name); kfree(prop->value); kfree(prop); } static struct property *dlpar_clone_property(struct property *prop, u32 prop_size) { struct property *new_prop; new_prop = kzalloc(sizeof(*new_prop), GFP_KERNEL); if (!new_prop) return NULL; new_prop->name = kstrdup(prop->name, GFP_KERNEL); new_prop->value = kzalloc(prop_size, GFP_KERNEL); if (!new_prop->name || !new_prop->value) { dlpar_free_property(new_prop); return NULL; } memcpy(new_prop->value, prop->value, prop->length); new_prop->length = prop_size; of_property_set_flag(new_prop, OF_DYNAMIC); return new_prop; } static bool find_aa_index(struct device_node *dr_node, struct property *ala_prop, const u32 *lmb_assoc, u32 *aa_index) { u32 *assoc_arrays, new_prop_size; struct property *new_prop; int aa_arrays, aa_array_entries, aa_array_sz; int i, index; /* * The ibm,associativity-lookup-arrays property is defined to be * a 32-bit value specifying the number of associativity arrays * followed by a 32-bitvalue specifying the number of entries per * array, followed by the associativity arrays. */ assoc_arrays = ala_prop->value; aa_arrays = be32_to_cpu(assoc_arrays[0]); aa_array_entries = be32_to_cpu(assoc_arrays[1]); aa_array_sz = aa_array_entries * sizeof(u32); for (i = 0; i < aa_arrays; i++) { index = (i * aa_array_entries) + 2; if (memcmp(&assoc_arrays[index], &lmb_assoc[1], aa_array_sz)) continue; *aa_index = i; return true; } new_prop_size = ala_prop->length + aa_array_sz; new_prop = dlpar_clone_property(ala_prop, new_prop_size); if (!new_prop) return false; assoc_arrays = new_prop->value; /* increment the number of entries in the lookup array */ assoc_arrays[0] = cpu_to_be32(aa_arrays + 1); /* copy the new associativity into the lookup array */ index = aa_arrays * aa_array_entries + 2; memcpy(&assoc_arrays[index], &lmb_assoc[1], aa_array_sz); of_update_property(dr_node, new_prop); /* * The associativity lookup array index for this lmb is * number of entries - 1 since we added its associativity * to the end of the lookup array. */ *aa_index = be32_to_cpu(assoc_arrays[0]) - 1; return true; } static int update_lmb_associativity_index(struct drmem_lmb *lmb) { struct device_node *parent, *lmb_node, *dr_node; struct property *ala_prop; const u32 *lmb_assoc; u32 aa_index; bool found; parent = of_find_node_by_path("/"); if (!parent) return -ENODEV; lmb_node = dlpar_configure_connector(cpu_to_be32(lmb->drc_index), parent); of_node_put(parent); if (!lmb_node) return -EINVAL; lmb_assoc = of_get_property(lmb_node, "ibm,associativity", NULL); if (!lmb_assoc) { dlpar_free_cc_nodes(lmb_node); return -ENODEV; } dr_node = of_find_node_by_path("/ibm,dynamic-reconfiguration-memory"); if (!dr_node) { dlpar_free_cc_nodes(lmb_node); return -ENODEV; } ala_prop = of_find_property(dr_node, "ibm,associativity-lookup-arrays", NULL); if (!ala_prop) { of_node_put(dr_node); dlpar_free_cc_nodes(lmb_node); return -ENODEV; } found = find_aa_index(dr_node, ala_prop, lmb_assoc, &aa_index); of_node_put(dr_node); dlpar_free_cc_nodes(lmb_node); if (!found) { pr_err("Could not find LMB associativity\n"); return -1; } lmb->aa_index = aa_index; return 0; } static struct memory_block *lmb_to_memblock(struct drmem_lmb *lmb) { unsigned long section_nr; struct mem_section *mem_sect; struct memory_block *mem_block; section_nr = pfn_to_section_nr(PFN_DOWN(lmb->base_addr)); mem_sect = __nr_to_section(section_nr); mem_block = find_memory_block(mem_sect); return mem_block; } static int get_lmb_range(u32 drc_index, int n_lmbs, struct drmem_lmb **start_lmb, struct drmem_lmb **end_lmb) { struct drmem_lmb *lmb, *start, *end; struct drmem_lmb *limit; start = NULL; for_each_drmem_lmb(lmb) { if (lmb->drc_index == drc_index) { start = lmb; break; } } if (!start) return -EINVAL; end = &start[n_lmbs]; limit = &drmem_info->lmbs[drmem_info->n_lmbs]; if (end > limit) return -EINVAL; *start_lmb = start; *end_lmb = end; return 0; } static int dlpar_change_lmb_state(struct drmem_lmb *lmb, bool online) { struct memory_block *mem_block; int rc; mem_block = lmb_to_memblock(lmb); if (!mem_block) return -EINVAL; if (online && mem_block->dev.offline) rc = device_online(&mem_block->dev); else if (!online && !mem_block->dev.offline) rc = device_offline(&mem_block->dev); else rc = 0; put_device(&mem_block->dev); return rc; } static int dlpar_online_lmb(struct drmem_lmb *lmb) { return dlpar_change_lmb_state(lmb, true); } #ifdef CONFIG_MEMORY_HOTREMOVE static int dlpar_offline_lmb(struct drmem_lmb *lmb) { return dlpar_change_lmb_state(lmb, false); } static int pseries_remove_memblock(unsigned long base, unsigned int memblock_size) { unsigned long block_sz, start_pfn; int sections_per_block; int i, nid; start_pfn = base >> PAGE_SHIFT; lock_device_hotplug(); if (!pfn_valid(start_pfn)) goto out; block_sz = pseries_memory_block_size(); sections_per_block = block_sz / MIN_MEMORY_BLOCK_SIZE; nid = memory_add_physaddr_to_nid(base); for (i = 0; i < sections_per_block; i++) { __remove_memory(nid, base, MIN_MEMORY_BLOCK_SIZE); base += MIN_MEMORY_BLOCK_SIZE; } out: /* Update memory regions for memory remove */ memblock_remove(base, memblock_size); unlock_device_hotplug(); return 0; } static int pseries_remove_mem_node(struct device_node *np) { const __be32 *regs; unsigned long base; unsigned int lmb_size; int ret = -EINVAL; /* * Check to see if we are actually removing memory */ if (!of_node_is_type(np, "memory")) return 0; /* * Find the base address and size of the memblock */ regs = of_get_property(np, "reg", NULL); if (!regs) return ret; base = be64_to_cpu(*(unsigned long *)regs); lmb_size = be32_to_cpu(regs[3]); pseries_remove_memblock(base, lmb_size); return 0; } static bool lmb_is_removable(struct drmem_lmb *lmb) { if (!(lmb->flags & DRCONF_MEM_ASSIGNED)) return false; #ifdef CONFIG_FA_DUMP /* * Don't hot-remove memory that falls in fadump boot memory area * and memory that is reserved for capturing old kernel memory. */ if (is_fadump_memory_area(lmb->base_addr, memory_block_size_bytes())) return false; #endif /* device_offline() will determine if we can actually remove this lmb */ return true; } static int dlpar_add_lmb(struct drmem_lmb *); static int dlpar_remove_lmb(struct drmem_lmb *lmb) { unsigned long block_sz; int rc; if (!lmb_is_removable(lmb)) return -EINVAL; rc = dlpar_offline_lmb(lmb); if (rc) return rc; block_sz = pseries_memory_block_size(); __remove_memory(lmb->nid, lmb->base_addr, block_sz); /* Update memory regions for memory remove */ memblock_remove(lmb->base_addr, block_sz); invalidate_lmb_associativity_index(lmb); lmb_clear_nid(lmb); lmb->flags &= ~DRCONF_MEM_ASSIGNED; return 0; } static int dlpar_memory_remove_by_count(u32 lmbs_to_remove) { struct drmem_lmb *lmb; int lmbs_removed = 0; int lmbs_available = 0; int rc; pr_info("Attempting to hot-remove %d LMB(s)\n", lmbs_to_remove); if (lmbs_to_remove == 0) return -EINVAL; /* Validate that there are enough LMBs to satisfy the request */ for_each_drmem_lmb(lmb) { if (lmb_is_removable(lmb)) lmbs_available++; if (lmbs_available == lmbs_to_remove) break; } if (lmbs_available < lmbs_to_remove) { pr_info("Not enough LMBs available (%d of %d) to satisfy request\n", lmbs_available, lmbs_to_remove); return -EINVAL; } for_each_drmem_lmb(lmb) { rc = dlpar_remove_lmb(lmb); if (rc) continue; /* Mark this lmb so we can add it later if all of the * requested LMBs cannot be removed. */ drmem_mark_lmb_reserved(lmb); lmbs_removed++; if (lmbs_removed == lmbs_to_remove) break; } if (lmbs_removed != lmbs_to_remove) { pr_err("Memory hot-remove failed, adding LMB's back\n"); for_each_drmem_lmb(lmb) { if (!drmem_lmb_reserved(lmb)) continue; rc = dlpar_add_lmb(lmb); if (rc) pr_err("Failed to add LMB back, drc index %x\n", lmb->drc_index); drmem_remove_lmb_reservation(lmb); } rc = -EINVAL; } else { for_each_drmem_lmb(lmb) { if (!drmem_lmb_reserved(lmb)) continue; dlpar_release_drc(lmb->drc_index); pr_info("Memory at %llx was hot-removed\n", lmb->base_addr); drmem_remove_lmb_reservation(lmb); } rc = 0; } return rc; } static int dlpar_memory_remove_by_index(u32 drc_index) { struct drmem_lmb *lmb; int lmb_found; int rc; pr_info("Attempting to hot-remove LMB, drc index %x\n", drc_index); lmb_found = 0; for_each_drmem_lmb(lmb) { if (lmb->drc_index == drc_index) { lmb_found = 1; rc = dlpar_remove_lmb(lmb); if (!rc) dlpar_release_drc(lmb->drc_index); break; } } if (!lmb_found) rc = -EINVAL; if (rc) pr_info("Failed to hot-remove memory at %llx\n", lmb->base_addr); else pr_info("Memory at %llx was hot-removed\n", lmb->base_addr); return rc; } static int dlpar_memory_readd_by_index(u32 drc_index) { struct drmem_lmb *lmb; int lmb_found; int rc; pr_info("Attempting to update LMB, drc index %x\n", drc_index); lmb_found = 0; for_each_drmem_lmb(lmb) { if (lmb->drc_index == drc_index) { lmb_found = 1; rc = dlpar_remove_lmb(lmb); if (!rc) { rc = dlpar_add_lmb(lmb); if (rc) dlpar_release_drc(lmb->drc_index); } break; } } if (!lmb_found) rc = -EINVAL; if (rc) pr_info("Failed to update memory at %llx\n", lmb->base_addr); else pr_info("Memory at %llx was updated\n", lmb->base_addr); return rc; } static int dlpar_memory_remove_by_ic(u32 lmbs_to_remove, u32 drc_index) { struct drmem_lmb *lmb, *start_lmb, *end_lmb; int lmbs_available = 0; int rc; pr_info("Attempting to hot-remove %u LMB(s) at %x\n", lmbs_to_remove, drc_index); if (lmbs_to_remove == 0) return -EINVAL; rc = get_lmb_range(drc_index, lmbs_to_remove, &start_lmb, &end_lmb); if (rc) return -EINVAL; /* Validate that there are enough LMBs to satisfy the request */ for_each_drmem_lmb_in_range(lmb, start_lmb, end_lmb) { if (lmb->flags & DRCONF_MEM_RESERVED) break; lmbs_available++; } if (lmbs_available < lmbs_to_remove) return -EINVAL; for_each_drmem_lmb_in_range(lmb, start_lmb, end_lmb) { if (!(lmb->flags & DRCONF_MEM_ASSIGNED)) continue; rc = dlpar_remove_lmb(lmb); if (rc) break; drmem_mark_lmb_reserved(lmb); } if (rc) { pr_err("Memory indexed-count-remove failed, adding any removed LMBs\n"); for_each_drmem_lmb_in_range(lmb, start_lmb, end_lmb) { if (!drmem_lmb_reserved(lmb)) continue; rc = dlpar_add_lmb(lmb); if (rc) pr_err("Failed to add LMB, drc index %x\n", lmb->drc_index); drmem_remove_lmb_reservation(lmb); } rc = -EINVAL; } else { for_each_drmem_lmb_in_range(lmb, start_lmb, end_lmb) { if (!drmem_lmb_reserved(lmb)) continue; dlpar_release_drc(lmb->drc_index); pr_info("Memory at %llx (drc index %x) was hot-removed\n", lmb->base_addr, lmb->drc_index); drmem_remove_lmb_reservation(lmb); } } return rc; } #else static inline int pseries_remove_memblock(unsigned long base, unsigned int memblock_size) { return -EOPNOTSUPP; } static inline int pseries_remove_mem_node(struct device_node *np) { return 0; } static inline int dlpar_memory_remove(struct pseries_hp_errorlog *hp_elog) { return -EOPNOTSUPP; } static int dlpar_remove_lmb(struct drmem_lmb *lmb) { return -EOPNOTSUPP; } static int dlpar_memory_remove_by_count(u32 lmbs_to_remove) { return -EOPNOTSUPP; } static int dlpar_memory_remove_by_index(u32 drc_index) { return -EOPNOTSUPP; } static int dlpar_memory_readd_by_index(u32 drc_index) { return -EOPNOTSUPP; } static int dlpar_memory_remove_by_ic(u32 lmbs_to_remove, u32 drc_index) { return -EOPNOTSUPP; } #endif /* CONFIG_MEMORY_HOTREMOVE */ static int dlpar_add_lmb(struct drmem_lmb *lmb) { unsigned long block_sz; int rc; if (lmb->flags & DRCONF_MEM_ASSIGNED) return -EINVAL; rc = update_lmb_associativity_index(lmb); if (rc) { dlpar_release_drc(lmb->drc_index); return rc; } lmb_set_nid(lmb); block_sz = memory_block_size_bytes(); /* Add the memory */ rc = __add_memory(lmb->nid, lmb->base_addr, block_sz); if (rc) { invalidate_lmb_associativity_index(lmb); return rc; } rc = dlpar_online_lmb(lmb); if (rc) { __remove_memory(lmb->nid, lmb->base_addr, block_sz); invalidate_lmb_associativity_index(lmb); lmb_clear_nid(lmb); } else { lmb->flags |= DRCONF_MEM_ASSIGNED; } return rc; } static int dlpar_memory_add_by_count(u32 lmbs_to_add) { struct drmem_lmb *lmb; int lmbs_available = 0; int lmbs_added = 0; int rc; pr_info("Attempting to hot-add %d LMB(s)\n", lmbs_to_add); if (lmbs_to_add == 0) return -EINVAL; /* Validate that there are enough LMBs to satisfy the request */ for_each_drmem_lmb(lmb) { if (!(lmb->flags & DRCONF_MEM_ASSIGNED)) lmbs_available++; if (lmbs_available == lmbs_to_add) break; } if (lmbs_available < lmbs_to_add) return -EINVAL; for_each_drmem_lmb(lmb) { if (lmb->flags & DRCONF_MEM_ASSIGNED) continue; rc = dlpar_acquire_drc(lmb->drc_index); if (rc) continue; rc = dlpar_add_lmb(lmb); if (rc) { dlpar_release_drc(lmb->drc_index); continue; } /* Mark this lmb so we can remove it later if all of the * requested LMBs cannot be added. */ drmem_mark_lmb_reserved(lmb); lmbs_added++; if (lmbs_added == lmbs_to_add) break; } if (lmbs_added != lmbs_to_add) { pr_err("Memory hot-add failed, removing any added LMBs\n"); for_each_drmem_lmb(lmb) { if (!drmem_lmb_reserved(lmb)) continue; rc = dlpar_remove_lmb(lmb); if (rc) pr_err("Failed to remove LMB, drc index %x\n", lmb->drc_index); else dlpar_release_drc(lmb->drc_index); drmem_remove_lmb_reservation(lmb); } rc = -EINVAL; } else { for_each_drmem_lmb(lmb) { if (!drmem_lmb_reserved(lmb)) continue; pr_info("Memory at %llx (drc index %x) was hot-added\n", lmb->base_addr, lmb->drc_index); drmem_remove_lmb_reservation(lmb); } rc = 0; } return rc; } static int dlpar_memory_add_by_index(u32 drc_index) { struct drmem_lmb *lmb; int rc, lmb_found; pr_info("Attempting to hot-add LMB, drc index %x\n", drc_index); lmb_found = 0; for_each_drmem_lmb(lmb) { if (lmb->drc_index == drc_index) { lmb_found = 1; rc = dlpar_acquire_drc(lmb->drc_index); if (!rc) { rc = dlpar_add_lmb(lmb); if (rc) dlpar_release_drc(lmb->drc_index); } break; } } if (!lmb_found) rc = -EINVAL; if (rc) pr_info("Failed to hot-add memory, drc index %x\n", drc_index); else pr_info("Memory at %llx (drc index %x) was hot-added\n", lmb->base_addr, drc_index); return rc; } static int dlpar_memory_add_by_ic(u32 lmbs_to_add, u32 drc_index) { struct drmem_lmb *lmb, *start_lmb, *end_lmb; int lmbs_available = 0; int rc; pr_info("Attempting to hot-add %u LMB(s) at index %x\n", lmbs_to_add, drc_index); if (lmbs_to_add == 0) return -EINVAL; rc = get_lmb_range(drc_index, lmbs_to_add, &start_lmb, &end_lmb); if (rc) return -EINVAL; /* Validate that the LMBs in this range are not reserved */ for_each_drmem_lmb_in_range(lmb, start_lmb, end_lmb) { if (lmb->flags & DRCONF_MEM_RESERVED) break; lmbs_available++; } if (lmbs_available < lmbs_to_add) return -EINVAL; for_each_drmem_lmb_in_range(lmb, start_lmb, end_lmb) { if (lmb->flags & DRCONF_MEM_ASSIGNED) continue; rc = dlpar_acquire_drc(lmb->drc_index); if (rc) break; rc = dlpar_add_lmb(lmb); if (rc) { dlpar_release_drc(lmb->drc_index); break; } drmem_mark_lmb_reserved(lmb); } if (rc) { pr_err("Memory indexed-count-add failed, removing any added LMBs\n"); for_each_drmem_lmb_in_range(lmb, start_lmb, end_lmb) { if (!drmem_lmb_reserved(lmb)) continue; rc = dlpar_remove_lmb(lmb); if (rc) pr_err("Failed to remove LMB, drc index %x\n", lmb->drc_index); else dlpar_release_drc(lmb->drc_index); drmem_remove_lmb_reservation(lmb); } rc = -EINVAL; } else { for_each_drmem_lmb_in_range(lmb, start_lmb, end_lmb) { if (!drmem_lmb_reserved(lmb)) continue; pr_info("Memory at %llx (drc index %x) was hot-added\n", lmb->base_addr, lmb->drc_index); drmem_remove_lmb_reservation(lmb); } } return rc; } int dlpar_memory(struct pseries_hp_errorlog *hp_elog) { u32 count, drc_index; int rc; lock_device_hotplug(); switch (hp_elog->action) { case PSERIES_HP_ELOG_ACTION_ADD: switch (hp_elog->id_type) { case PSERIES_HP_ELOG_ID_DRC_COUNT: count = hp_elog->_drc_u.drc_count; rc = dlpar_memory_add_by_count(count); break; case PSERIES_HP_ELOG_ID_DRC_INDEX: drc_index = hp_elog->_drc_u.drc_index; rc = dlpar_memory_add_by_index(drc_index); break; case PSERIES_HP_ELOG_ID_DRC_IC: count = hp_elog->_drc_u.ic.count; drc_index = hp_elog->_drc_u.ic.index; rc = dlpar_memory_add_by_ic(count, drc_index); break; default: rc = -EINVAL; break; } break; case PSERIES_HP_ELOG_ACTION_REMOVE: switch (hp_elog->id_type) { case PSERIES_HP_ELOG_ID_DRC_COUNT: count = hp_elog->_drc_u.drc_count; rc = dlpar_memory_remove_by_count(count); break; case PSERIES_HP_ELOG_ID_DRC_INDEX: drc_index = hp_elog->_drc_u.drc_index; rc = dlpar_memory_remove_by_index(drc_index); break; case PSERIES_HP_ELOG_ID_DRC_IC: count = hp_elog->_drc_u.ic.count; drc_index = hp_elog->_drc_u.ic.index; rc = dlpar_memory_remove_by_ic(count, drc_index); break; default: rc = -EINVAL; break; } break; case PSERIES_HP_ELOG_ACTION_READD: drc_index = hp_elog->_drc_u.drc_index; rc = dlpar_memory_readd_by_index(drc_index); break; default: pr_err("Invalid action (%d) specified\n", hp_elog->action); rc = -EINVAL; break; } if (!rc) { rtas_hp_event = true; rc = drmem_update_dt(); rtas_hp_event = false; } unlock_device_hotplug(); return rc; } static int pseries_add_mem_node(struct device_node *np) { const __be32 *regs; unsigned long base; unsigned int lmb_size; int ret = -EINVAL; /* * Check to see if we are actually adding memory */ if (!of_node_is_type(np, "memory")) return 0; /* * Find the base and size of the memblock */ regs = of_get_property(np, "reg", NULL); if (!regs) return ret; base = be64_to_cpu(*(unsigned long *)regs); lmb_size = be32_to_cpu(regs[3]); /* * Update memory region to represent the memory add */ ret = memblock_add(base, lmb_size); return (ret < 0) ? -EINVAL : 0; } static int pseries_update_drconf_memory(struct of_reconfig_data *pr) { struct of_drconf_cell_v1 *new_drmem, *old_drmem; unsigned long memblock_size; u32 entries; __be32 *p; int i, rc = -EINVAL; if (rtas_hp_event) return 0; memblock_size = pseries_memory_block_size(); if (!memblock_size) return -EINVAL; if (!pr->old_prop) return 0; p = (__be32 *) pr->old_prop->value; if (!p) return -EINVAL; /* The first int of the property is the number of lmb's described * by the property. This is followed by an array of of_drconf_cell * entries. Get the number of entries and skip to the array of * of_drconf_cell's. */ entries = be32_to_cpu(*p++); old_drmem = (struct of_drconf_cell_v1 *)p; p = (__be32 *)pr->prop->value; p++; new_drmem = (struct of_drconf_cell_v1 *)p; for (i = 0; i < entries; i++) { if ((be32_to_cpu(old_drmem[i].flags) & DRCONF_MEM_ASSIGNED) && (!(be32_to_cpu(new_drmem[i].flags) & DRCONF_MEM_ASSIGNED))) { rc = pseries_remove_memblock( be64_to_cpu(old_drmem[i].base_addr), memblock_size); break; } else if ((!(be32_to_cpu(old_drmem[i].flags) & DRCONF_MEM_ASSIGNED)) && (be32_to_cpu(new_drmem[i].flags) & DRCONF_MEM_ASSIGNED)) { rc = memblock_add(be64_to_cpu(old_drmem[i].base_addr), memblock_size); rc = (rc < 0) ? -EINVAL : 0; break; } } return rc; } static int pseries_memory_notifier(struct notifier_block *nb, unsigned long action, void *data) { struct of_reconfig_data *rd = data; int err = 0; switch (action) { case OF_RECONFIG_ATTACH_NODE: err = pseries_add_mem_node(rd->dn); break; case OF_RECONFIG_DETACH_NODE: err = pseries_remove_mem_node(rd->dn); break; case OF_RECONFIG_UPDATE_PROPERTY: if (!strcmp(rd->prop->name, "ibm,dynamic-memory")) err = pseries_update_drconf_memory(rd); break; } return notifier_from_errno(err); } static struct notifier_block pseries_mem_nb = { .notifier_call = pseries_memory_notifier, }; static int __init pseries_memory_hotplug_init(void) { if (firmware_has_feature(FW_FEATURE_LPAR)) of_reconfig_notifier_register(&pseries_mem_nb); return 0; } machine_device_initcall(pseries, pseries_memory_hotplug_init);