diff options
Diffstat (limited to 'arch/powerpc/platforms/pseries/hotplug-memory.c')
| -rw-r--r-- | arch/powerpc/platforms/pseries/hotplug-memory.c | 738 |
1 files changed, 738 insertions, 0 deletions
diff --git a/arch/powerpc/platforms/pseries/hotplug-memory.c b/arch/powerpc/platforms/pseries/hotplug-memory.c new file mode 100644 index 000000000..0ced387e1 --- /dev/null +++ b/arch/powerpc/platforms/pseries/hotplug-memory.c @@ -0,0 +1,738 @@ +/* + * pseries Memory Hotplug infrastructure. + * + * Copyright (C) 2008 Badari Pulavarty, IBM Corporation + * + * 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. + */ + +#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 "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_drconf_property(struct property *prop) +{ + kfree(prop->name); + kfree(prop->value); + kfree(prop); +} + +static struct property *dlpar_clone_drconf_property(struct device_node *dn) +{ + struct property *prop, *new_prop; + struct of_drconf_cell *lmbs; + u32 num_lmbs, *p; + int i; + + prop = of_find_property(dn, "ibm,dynamic-memory", NULL); + if (!prop) + return NULL; + + new_prop = kzalloc(sizeof(*new_prop), GFP_KERNEL); + if (!new_prop) + return NULL; + + new_prop->name = kstrdup(prop->name, GFP_KERNEL); + new_prop->value = kmalloc(prop->length, GFP_KERNEL); + if (!new_prop->name || !new_prop->value) { + dlpar_free_drconf_property(new_prop); + return NULL; + } + + memcpy(new_prop->value, prop->value, prop->length); + new_prop->length = prop->length; + + /* Convert the property to cpu endian-ness */ + p = new_prop->value; + *p = be32_to_cpu(*p); + + num_lmbs = *p++; + lmbs = (struct of_drconf_cell *)p; + + for (i = 0; i < num_lmbs; i++) { + lmbs[i].base_addr = be64_to_cpu(lmbs[i].base_addr); + lmbs[i].drc_index = be32_to_cpu(lmbs[i].drc_index); + lmbs[i].flags = be32_to_cpu(lmbs[i].flags); + } + + return new_prop; +} + +static struct memory_block *lmb_to_memblock(struct of_drconf_cell *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; +} + +#ifdef CONFIG_MEMORY_HOTREMOVE +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 char *type; + const __be32 *regs; + unsigned long base; + unsigned int lmb_size; + int ret = -EINVAL; + + /* + * Check to see if we are actually removing memory + */ + type = of_get_property(np, "device_type", NULL); + if (type == NULL || strcmp(type, "memory") != 0) + 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 of_drconf_cell *lmb) +{ + int i, scns_per_block; + int rc = 1; + unsigned long pfn, block_sz; + u64 phys_addr; + + if (!(lmb->flags & DRCONF_MEM_ASSIGNED)) + return false; + + block_sz = memory_block_size_bytes(); + scns_per_block = block_sz / MIN_MEMORY_BLOCK_SIZE; + phys_addr = lmb->base_addr; + + for (i = 0; i < scns_per_block; i++) { + pfn = PFN_DOWN(phys_addr); + if (!pfn_present(pfn)) + continue; + + rc &= is_mem_section_removable(pfn, PAGES_PER_SECTION); + phys_addr += MIN_MEMORY_BLOCK_SIZE; + } + + return rc ? true : false; +} + +static int dlpar_add_lmb(struct of_drconf_cell *); + +static int dlpar_remove_lmb(struct of_drconf_cell *lmb) +{ + struct memory_block *mem_block; + unsigned long block_sz; + int nid, rc; + + if (!lmb_is_removable(lmb)) + return -EINVAL; + + mem_block = lmb_to_memblock(lmb); + if (!mem_block) + return -EINVAL; + + rc = device_offline(&mem_block->dev); + put_device(&mem_block->dev); + if (rc) + return rc; + + block_sz = pseries_memory_block_size(); + nid = memory_add_physaddr_to_nid(lmb->base_addr); + + remove_memory(nid, lmb->base_addr, block_sz); + + /* Update memory regions for memory remove */ + memblock_remove(lmb->base_addr, block_sz); + + dlpar_release_drc(lmb->drc_index); + + lmb->flags &= ~DRCONF_MEM_ASSIGNED; + return 0; +} + +static int dlpar_memory_remove_by_count(u32 lmbs_to_remove, + struct property *prop) +{ + struct of_drconf_cell *lmbs; + int lmbs_removed = 0; + int lmbs_available = 0; + u32 num_lmbs, *p; + int i, rc; + + pr_info("Attempting to hot-remove %d LMB(s)\n", lmbs_to_remove); + + if (lmbs_to_remove == 0) + return -EINVAL; + + p = prop->value; + num_lmbs = *p++; + lmbs = (struct of_drconf_cell *)p; + + /* Validate that there are enough LMBs to satisfy the request */ + for (i = 0; i < num_lmbs; i++) { + if (lmbs[i].flags & DRCONF_MEM_ASSIGNED) + lmbs_available++; + } + + if (lmbs_available < lmbs_to_remove) + return -EINVAL; + + for (i = 0; i < num_lmbs && lmbs_removed < lmbs_to_remove; i++) { + rc = dlpar_remove_lmb(&lmbs[i]); + if (rc) + continue; + + lmbs_removed++; + + /* Mark this lmb so we can add it later if all of the + * requested LMBs cannot be removed. + */ + lmbs[i].reserved = 1; + } + + if (lmbs_removed != lmbs_to_remove) { + pr_err("Memory hot-remove failed, adding LMB's back\n"); + + for (i = 0; i < num_lmbs; i++) { + if (!lmbs[i].reserved) + continue; + + rc = dlpar_add_lmb(&lmbs[i]); + if (rc) + pr_err("Failed to add LMB back, drc index %x\n", + lmbs[i].drc_index); + + lmbs[i].reserved = 0; + } + + rc = -EINVAL; + } else { + for (i = 0; i < num_lmbs; i++) { + if (!lmbs[i].reserved) + continue; + + pr_info("Memory at %llx was hot-removed\n", + lmbs[i].base_addr); + + lmbs[i].reserved = 0; + } + rc = 0; + } + + return rc; +} + +static int dlpar_memory_remove_by_index(u32 drc_index, struct property *prop) +{ + struct of_drconf_cell *lmbs; + u32 num_lmbs, *p; + int lmb_found; + int i, rc; + + pr_info("Attempting to hot-remove LMB, drc index %x\n", drc_index); + + p = prop->value; + num_lmbs = *p++; + lmbs = (struct of_drconf_cell *)p; + + lmb_found = 0; + for (i = 0; i < num_lmbs; i++) { + if (lmbs[i].drc_index == drc_index) { + lmb_found = 1; + rc = dlpar_remove_lmb(&lmbs[i]); + break; + } + } + + if (!lmb_found) + rc = -EINVAL; + + if (rc) + pr_info("Failed to hot-remove memory at %llx\n", + lmbs[i].base_addr); + else + pr_info("Memory at %llx was hot-removed\n", lmbs[i].base_addr); + + 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 of_drconf_cell *lmb) +{ + return -EOPNOTSUPP; +} +static int dlpar_memory_remove_by_count(u32 lmbs_to_remove, + struct property *prop) +{ + return -EOPNOTSUPP; +} +static int dlpar_memory_remove_by_index(u32 drc_index, struct property *prop) +{ + return -EOPNOTSUPP; +} + +#endif /* CONFIG_MEMORY_HOTREMOVE */ + +static int dlpar_add_lmb(struct of_drconf_cell *lmb) +{ + struct memory_block *mem_block; + unsigned long block_sz; + int nid, rc; + + if (lmb->flags & DRCONF_MEM_ASSIGNED) + return -EINVAL; + + block_sz = memory_block_size_bytes(); + + rc = dlpar_acquire_drc(lmb->drc_index); + if (rc) + return rc; + + /* Find the node id for this address */ + nid = memory_add_physaddr_to_nid(lmb->base_addr); + + /* Add the memory */ + rc = add_memory(nid, lmb->base_addr, block_sz); + if (rc) { + dlpar_release_drc(lmb->drc_index); + return rc; + } + + /* Register this block of memory */ + rc = memblock_add(lmb->base_addr, block_sz); + if (rc) { + remove_memory(nid, lmb->base_addr, block_sz); + dlpar_release_drc(lmb->drc_index); + return rc; + } + + mem_block = lmb_to_memblock(lmb); + if (!mem_block) { + remove_memory(nid, lmb->base_addr, block_sz); + dlpar_release_drc(lmb->drc_index); + return -EINVAL; + } + + rc = device_online(&mem_block->dev); + put_device(&mem_block->dev); + if (rc) { + remove_memory(nid, lmb->base_addr, block_sz); + dlpar_release_drc(lmb->drc_index); + return rc; + } + + lmb->flags |= DRCONF_MEM_ASSIGNED; + return 0; +} + +static int dlpar_memory_add_by_count(u32 lmbs_to_add, struct property *prop) +{ + struct of_drconf_cell *lmbs; + u32 num_lmbs, *p; + int lmbs_available = 0; + int lmbs_added = 0; + int i, rc; + + pr_info("Attempting to hot-add %d LMB(s)\n", lmbs_to_add); + + if (lmbs_to_add == 0) + return -EINVAL; + + p = prop->value; + num_lmbs = *p++; + lmbs = (struct of_drconf_cell *)p; + + /* Validate that there are enough LMBs to satisfy the request */ + for (i = 0; i < num_lmbs; i++) { + if (!(lmbs[i].flags & DRCONF_MEM_ASSIGNED)) + lmbs_available++; + } + + if (lmbs_available < lmbs_to_add) + return -EINVAL; + + for (i = 0; i < num_lmbs && lmbs_to_add != lmbs_added; i++) { + rc = dlpar_add_lmb(&lmbs[i]); + if (rc) + continue; + + lmbs_added++; + + /* Mark this lmb so we can remove it later if all of the + * requested LMBs cannot be added. + */ + lmbs[i].reserved = 1; + } + + if (lmbs_added != lmbs_to_add) { + pr_err("Memory hot-add failed, removing any added LMBs\n"); + + for (i = 0; i < num_lmbs; i++) { + if (!lmbs[i].reserved) + continue; + + rc = dlpar_remove_lmb(&lmbs[i]); + if (rc) + pr_err("Failed to remove LMB, drc index %x\n", + be32_to_cpu(lmbs[i].drc_index)); + } + rc = -EINVAL; + } else { + for (i = 0; i < num_lmbs; i++) { + if (!lmbs[i].reserved) + continue; + + pr_info("Memory at %llx (drc index %x) was hot-added\n", + lmbs[i].base_addr, lmbs[i].drc_index); + lmbs[i].reserved = 0; + } + } + + return rc; +} + +static int dlpar_memory_add_by_index(u32 drc_index, struct property *prop) +{ + struct of_drconf_cell *lmbs; + u32 num_lmbs, *p; + int i, lmb_found; + int rc; + + pr_info("Attempting to hot-add LMB, drc index %x\n", drc_index); + + p = prop->value; + num_lmbs = *p++; + lmbs = (struct of_drconf_cell *)p; + + lmb_found = 0; + for (i = 0; i < num_lmbs; i++) { + if (lmbs[i].drc_index == drc_index) { + lmb_found = 1; + rc = dlpar_add_lmb(&lmbs[i]); + 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", + lmbs[i].base_addr, drc_index); + + return rc; +} + +static void dlpar_update_drconf_property(struct device_node *dn, + struct property *prop) +{ + struct of_drconf_cell *lmbs; + u32 num_lmbs, *p; + int i; + + /* Convert the property back to BE */ + p = prop->value; + num_lmbs = *p; + *p = cpu_to_be32(*p); + p++; + + lmbs = (struct of_drconf_cell *)p; + for (i = 0; i < num_lmbs; i++) { + lmbs[i].base_addr = cpu_to_be64(lmbs[i].base_addr); + lmbs[i].drc_index = cpu_to_be32(lmbs[i].drc_index); + lmbs[i].flags = cpu_to_be32(lmbs[i].flags); + } + + rtas_hp_event = true; + of_update_property(dn, prop); + rtas_hp_event = false; +} + +int dlpar_memory(struct pseries_hp_errorlog *hp_elog) +{ + struct device_node *dn; + struct property *prop; + u32 count, drc_index; + int rc; + + count = hp_elog->_drc_u.drc_count; + drc_index = hp_elog->_drc_u.drc_index; + + lock_device_hotplug(); + + dn = of_find_node_by_path("/ibm,dynamic-reconfiguration-memory"); + if (!dn) { + rc = -EINVAL; + goto dlpar_memory_out; + } + + prop = dlpar_clone_drconf_property(dn); + if (!prop) { + rc = -EINVAL; + goto dlpar_memory_out; + } + + switch (hp_elog->action) { + case PSERIES_HP_ELOG_ACTION_ADD: + if (hp_elog->id_type == PSERIES_HP_ELOG_ID_DRC_COUNT) + rc = dlpar_memory_add_by_count(count, prop); + else if (hp_elog->id_type == PSERIES_HP_ELOG_ID_DRC_INDEX) + rc = dlpar_memory_add_by_index(drc_index, prop); + else + rc = -EINVAL; + break; + case PSERIES_HP_ELOG_ACTION_REMOVE: + if (hp_elog->id_type == PSERIES_HP_ELOG_ID_DRC_COUNT) + rc = dlpar_memory_remove_by_count(count, prop); + else if (hp_elog->id_type == PSERIES_HP_ELOG_ID_DRC_INDEX) + rc = dlpar_memory_remove_by_index(drc_index, prop); + else + rc = -EINVAL; + break; + default: + pr_err("Invalid action (%d) specified\n", hp_elog->action); + rc = -EINVAL; + break; + } + + if (rc) + dlpar_free_drconf_property(prop); + else + dlpar_update_drconf_property(dn, prop); + +dlpar_memory_out: + of_node_put(dn); + unlock_device_hotplug(); + return rc; +} + +static int pseries_add_mem_node(struct device_node *np) +{ + const char *type; + const __be32 *regs; + unsigned long base; + unsigned int lmb_size; + int ret = -EINVAL; + + /* + * Check to see if we are actually adding memory + */ + type = of_get_property(np, "device_type", NULL); + if (type == NULL || strcmp(type, "memory") != 0) + 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 *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; + + 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 *)p; + + p = (__be32 *)pr->prop->value; + p++; + new_drmem = (struct of_drconf_cell *)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); |