1001 lines
22 KiB
C
1001 lines
22 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* pseries Memory Hotplug infrastructure.
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*
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* Copyright (C) 2008 Badari Pulavarty, IBM Corporation
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*/
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#define pr_fmt(fmt) "pseries-hotplug-mem: " fmt
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#include <linux/of.h>
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#include <linux/of_address.h>
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#include <linux/memblock.h>
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#include <linux/memory.h>
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#include <linux/memory_hotplug.h>
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#include <linux/slab.h>
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#include <asm/firmware.h>
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#include <asm/machdep.h>
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#include <asm/prom.h>
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#include <asm/sparsemem.h>
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#include <asm/fadump.h>
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#include <asm/drmem.h>
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#include "pseries.h"
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unsigned long pseries_memory_block_size(void)
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{
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struct device_node *np;
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u64 memblock_size = MIN_MEMORY_BLOCK_SIZE;
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struct resource r;
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np = of_find_node_by_path("/ibm,dynamic-reconfiguration-memory");
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if (np) {
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int len;
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int size_cells;
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const __be32 *prop;
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size_cells = of_n_size_cells(np);
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prop = of_get_property(np, "ibm,lmb-size", &len);
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if (prop && len >= size_cells * sizeof(__be32))
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memblock_size = of_read_number(prop, size_cells);
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of_node_put(np);
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} else if (machine_is(pseries)) {
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/* This fallback really only applies to pseries */
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unsigned int memzero_size = 0;
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np = of_find_node_by_path("/memory@0");
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if (np) {
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if (!of_address_to_resource(np, 0, &r))
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memzero_size = resource_size(&r);
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of_node_put(np);
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}
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if (memzero_size) {
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/* We now know the size of memory@0, use this to find
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* the first memoryblock and get its size.
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*/
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char buf[64];
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sprintf(buf, "/memory@%x", memzero_size);
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np = of_find_node_by_path(buf);
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if (np) {
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if (!of_address_to_resource(np, 0, &r))
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memblock_size = resource_size(&r);
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of_node_put(np);
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}
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}
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}
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return memblock_size;
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}
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static void dlpar_free_property(struct property *prop)
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{
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kfree(prop->name);
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kfree(prop->value);
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kfree(prop);
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}
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static struct property *dlpar_clone_property(struct property *prop,
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u32 prop_size)
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{
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struct property *new_prop;
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new_prop = kzalloc(sizeof(*new_prop), GFP_KERNEL);
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if (!new_prop)
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return NULL;
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new_prop->name = kstrdup(prop->name, GFP_KERNEL);
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new_prop->value = kzalloc(prop_size, GFP_KERNEL);
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if (!new_prop->name || !new_prop->value) {
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dlpar_free_property(new_prop);
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return NULL;
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}
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memcpy(new_prop->value, prop->value, prop->length);
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new_prop->length = prop_size;
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of_property_set_flag(new_prop, OF_DYNAMIC);
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return new_prop;
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}
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static bool find_aa_index(struct device_node *dr_node,
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struct property *ala_prop,
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const u32 *lmb_assoc, u32 *aa_index)
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{
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u32 *assoc_arrays, new_prop_size;
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struct property *new_prop;
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int aa_arrays, aa_array_entries, aa_array_sz;
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int i, index;
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/*
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* The ibm,associativity-lookup-arrays property is defined to be
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* a 32-bit value specifying the number of associativity arrays
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* followed by a 32-bitvalue specifying the number of entries per
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* array, followed by the associativity arrays.
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*/
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assoc_arrays = ala_prop->value;
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aa_arrays = be32_to_cpu(assoc_arrays[0]);
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aa_array_entries = be32_to_cpu(assoc_arrays[1]);
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aa_array_sz = aa_array_entries * sizeof(u32);
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for (i = 0; i < aa_arrays; i++) {
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index = (i * aa_array_entries) + 2;
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if (memcmp(&assoc_arrays[index], &lmb_assoc[1], aa_array_sz))
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continue;
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*aa_index = i;
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return true;
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}
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new_prop_size = ala_prop->length + aa_array_sz;
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new_prop = dlpar_clone_property(ala_prop, new_prop_size);
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if (!new_prop)
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return false;
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assoc_arrays = new_prop->value;
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/* increment the number of entries in the lookup array */
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assoc_arrays[0] = cpu_to_be32(aa_arrays + 1);
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/* copy the new associativity into the lookup array */
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index = aa_arrays * aa_array_entries + 2;
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memcpy(&assoc_arrays[index], &lmb_assoc[1], aa_array_sz);
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of_update_property(dr_node, new_prop);
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/*
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* The associativity lookup array index for this lmb is
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* number of entries - 1 since we added its associativity
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* to the end of the lookup array.
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*/
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*aa_index = be32_to_cpu(assoc_arrays[0]) - 1;
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return true;
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}
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static int update_lmb_associativity_index(struct drmem_lmb *lmb)
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{
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struct device_node *parent, *lmb_node, *dr_node;
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struct property *ala_prop;
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const u32 *lmb_assoc;
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u32 aa_index;
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bool found;
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parent = of_find_node_by_path("/");
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if (!parent)
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return -ENODEV;
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lmb_node = dlpar_configure_connector(cpu_to_be32(lmb->drc_index),
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parent);
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of_node_put(parent);
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if (!lmb_node)
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return -EINVAL;
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lmb_assoc = of_get_property(lmb_node, "ibm,associativity", NULL);
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if (!lmb_assoc) {
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dlpar_free_cc_nodes(lmb_node);
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return -ENODEV;
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}
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update_numa_distance(lmb_node);
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dr_node = of_find_node_by_path("/ibm,dynamic-reconfiguration-memory");
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if (!dr_node) {
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dlpar_free_cc_nodes(lmb_node);
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return -ENODEV;
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}
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ala_prop = of_find_property(dr_node, "ibm,associativity-lookup-arrays",
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NULL);
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if (!ala_prop) {
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of_node_put(dr_node);
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dlpar_free_cc_nodes(lmb_node);
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return -ENODEV;
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}
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found = find_aa_index(dr_node, ala_prop, lmb_assoc, &aa_index);
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of_node_put(dr_node);
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dlpar_free_cc_nodes(lmb_node);
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if (!found) {
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pr_err("Could not find LMB associativity\n");
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return -1;
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}
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lmb->aa_index = aa_index;
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return 0;
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}
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static struct memory_block *lmb_to_memblock(struct drmem_lmb *lmb)
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{
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unsigned long section_nr;
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struct memory_block *mem_block;
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section_nr = pfn_to_section_nr(PFN_DOWN(lmb->base_addr));
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mem_block = find_memory_block(section_nr);
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return mem_block;
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}
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static int get_lmb_range(u32 drc_index, int n_lmbs,
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struct drmem_lmb **start_lmb,
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struct drmem_lmb **end_lmb)
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{
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struct drmem_lmb *lmb, *start, *end;
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struct drmem_lmb *limit;
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start = NULL;
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for_each_drmem_lmb(lmb) {
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if (lmb->drc_index == drc_index) {
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start = lmb;
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break;
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}
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}
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if (!start)
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return -EINVAL;
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end = &start[n_lmbs];
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limit = &drmem_info->lmbs[drmem_info->n_lmbs];
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if (end > limit)
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return -EINVAL;
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*start_lmb = start;
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*end_lmb = end;
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return 0;
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}
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static int dlpar_change_lmb_state(struct drmem_lmb *lmb, bool online)
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{
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struct memory_block *mem_block;
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int rc;
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mem_block = lmb_to_memblock(lmb);
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if (!mem_block)
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return -EINVAL;
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if (online && mem_block->dev.offline)
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rc = device_online(&mem_block->dev);
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else if (!online && !mem_block->dev.offline)
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rc = device_offline(&mem_block->dev);
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else
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rc = 0;
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put_device(&mem_block->dev);
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return rc;
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}
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static int dlpar_online_lmb(struct drmem_lmb *lmb)
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{
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return dlpar_change_lmb_state(lmb, true);
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}
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#ifdef CONFIG_MEMORY_HOTREMOVE
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static int dlpar_offline_lmb(struct drmem_lmb *lmb)
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{
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return dlpar_change_lmb_state(lmb, false);
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}
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static int pseries_remove_memblock(unsigned long base, unsigned long memblock_size)
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{
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unsigned long block_sz, start_pfn;
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int sections_per_block;
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int i;
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start_pfn = base >> PAGE_SHIFT;
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lock_device_hotplug();
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if (!pfn_valid(start_pfn))
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goto out;
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block_sz = pseries_memory_block_size();
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sections_per_block = block_sz / MIN_MEMORY_BLOCK_SIZE;
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for (i = 0; i < sections_per_block; i++) {
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__remove_memory(base, MIN_MEMORY_BLOCK_SIZE);
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base += MIN_MEMORY_BLOCK_SIZE;
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}
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out:
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/* Update memory regions for memory remove */
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memblock_remove(base, memblock_size);
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unlock_device_hotplug();
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return 0;
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}
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static int pseries_remove_mem_node(struct device_node *np)
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{
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const __be32 *prop;
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unsigned long base;
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unsigned long lmb_size;
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int ret = -EINVAL;
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int addr_cells, size_cells;
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/*
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* Check to see if we are actually removing memory
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*/
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if (!of_node_is_type(np, "memory"))
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return 0;
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/*
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* Find the base address and size of the memblock
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*/
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prop = of_get_property(np, "reg", NULL);
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if (!prop)
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return ret;
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addr_cells = of_n_addr_cells(np);
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size_cells = of_n_size_cells(np);
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/*
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* "reg" property represents (addr,size) tuple.
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*/
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base = of_read_number(prop, addr_cells);
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prop += addr_cells;
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lmb_size = of_read_number(prop, size_cells);
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pseries_remove_memblock(base, lmb_size);
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return 0;
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}
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static bool lmb_is_removable(struct drmem_lmb *lmb)
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{
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if ((lmb->flags & DRCONF_MEM_RESERVED) ||
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!(lmb->flags & DRCONF_MEM_ASSIGNED))
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return false;
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#ifdef CONFIG_FA_DUMP
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/*
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* Don't hot-remove memory that falls in fadump boot memory area
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* and memory that is reserved for capturing old kernel memory.
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*/
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if (is_fadump_memory_area(lmb->base_addr, memory_block_size_bytes()))
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return false;
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#endif
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/* device_offline() will determine if we can actually remove this lmb */
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return true;
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}
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static int dlpar_add_lmb(struct drmem_lmb *);
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static int dlpar_remove_lmb(struct drmem_lmb *lmb)
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{
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struct memory_block *mem_block;
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unsigned long block_sz;
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int rc;
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if (!lmb_is_removable(lmb))
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return -EINVAL;
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mem_block = lmb_to_memblock(lmb);
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if (mem_block == NULL)
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return -EINVAL;
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rc = dlpar_offline_lmb(lmb);
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if (rc) {
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put_device(&mem_block->dev);
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return rc;
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}
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block_sz = pseries_memory_block_size();
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__remove_memory(lmb->base_addr, block_sz);
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put_device(&mem_block->dev);
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/* Update memory regions for memory remove */
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memblock_remove(lmb->base_addr, block_sz);
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invalidate_lmb_associativity_index(lmb);
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lmb->flags &= ~DRCONF_MEM_ASSIGNED;
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return 0;
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}
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static int dlpar_memory_remove_by_count(u32 lmbs_to_remove)
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{
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struct drmem_lmb *lmb;
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int lmbs_reserved = 0;
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int lmbs_available = 0;
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int rc;
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pr_info("Attempting to hot-remove %d LMB(s)\n", lmbs_to_remove);
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if (lmbs_to_remove == 0)
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return -EINVAL;
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/* Validate that there are enough LMBs to satisfy the request */
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for_each_drmem_lmb(lmb) {
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if (lmb_is_removable(lmb))
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lmbs_available++;
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if (lmbs_available == lmbs_to_remove)
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break;
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}
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if (lmbs_available < lmbs_to_remove) {
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pr_info("Not enough LMBs available (%d of %d) to satisfy request\n",
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lmbs_available, lmbs_to_remove);
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return -EINVAL;
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}
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for_each_drmem_lmb(lmb) {
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rc = dlpar_remove_lmb(lmb);
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if (rc)
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continue;
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/* Mark this lmb so we can add it later if all of the
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* requested LMBs cannot be removed.
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*/
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drmem_mark_lmb_reserved(lmb);
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lmbs_reserved++;
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if (lmbs_reserved == lmbs_to_remove)
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break;
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}
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if (lmbs_reserved != lmbs_to_remove) {
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pr_err("Memory hot-remove failed, adding LMB's back\n");
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for_each_drmem_lmb(lmb) {
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if (!drmem_lmb_reserved(lmb))
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continue;
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rc = dlpar_add_lmb(lmb);
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if (rc)
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pr_err("Failed to add LMB back, drc index %x\n",
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lmb->drc_index);
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drmem_remove_lmb_reservation(lmb);
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lmbs_reserved--;
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if (lmbs_reserved == 0)
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break;
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}
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rc = -EINVAL;
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} else {
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for_each_drmem_lmb(lmb) {
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if (!drmem_lmb_reserved(lmb))
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continue;
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dlpar_release_drc(lmb->drc_index);
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pr_info("Memory at %llx was hot-removed\n",
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lmb->base_addr);
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drmem_remove_lmb_reservation(lmb);
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lmbs_reserved--;
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if (lmbs_reserved == 0)
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break;
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}
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rc = 0;
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}
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return rc;
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}
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static int dlpar_memory_remove_by_index(u32 drc_index)
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{
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struct drmem_lmb *lmb;
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int lmb_found;
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int rc;
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pr_debug("Attempting to hot-remove LMB, drc index %x\n", drc_index);
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lmb_found = 0;
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for_each_drmem_lmb(lmb) {
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if (lmb->drc_index == drc_index) {
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lmb_found = 1;
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rc = dlpar_remove_lmb(lmb);
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if (!rc)
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dlpar_release_drc(lmb->drc_index);
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break;
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}
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}
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if (!lmb_found)
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rc = -EINVAL;
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if (rc)
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pr_debug("Failed to hot-remove memory at %llx\n",
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lmb->base_addr);
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else
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pr_debug("Memory at %llx was hot-removed\n", lmb->base_addr);
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return rc;
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}
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static int dlpar_memory_remove_by_ic(u32 lmbs_to_remove, u32 drc_index)
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{
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struct drmem_lmb *lmb, *start_lmb, *end_lmb;
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int rc;
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pr_info("Attempting to hot-remove %u LMB(s) at %x\n",
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lmbs_to_remove, drc_index);
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if (lmbs_to_remove == 0)
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return -EINVAL;
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rc = get_lmb_range(drc_index, lmbs_to_remove, &start_lmb, &end_lmb);
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if (rc)
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return -EINVAL;
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/*
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* Validate that all LMBs in range are not reserved. Note that it
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* is ok if they are !ASSIGNED since our goal here is to remove the
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* LMB range, regardless of whether some LMBs were already removed
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* by any other reason.
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*
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* This is a contrast to what is done in remove_by_count() where we
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* check for both RESERVED and !ASSIGNED (via lmb_is_removable()),
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* because we want to remove a fixed amount of LMBs in that function.
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*/
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for_each_drmem_lmb_in_range(lmb, start_lmb, end_lmb) {
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if (lmb->flags & DRCONF_MEM_RESERVED) {
|
|
pr_err("Memory at %llx (drc index %x) is reserved\n",
|
|
lmb->base_addr, lmb->drc_index);
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
for_each_drmem_lmb_in_range(lmb, start_lmb, end_lmb) {
|
|
/*
|
|
* dlpar_remove_lmb() will error out if the LMB is already
|
|
* !ASSIGNED, but this case is a no-op for us.
|
|
*/
|
|
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;
|
|
|
|
/*
|
|
* Setting the isolation state of an UNISOLATED/CONFIGURED
|
|
* device to UNISOLATE is a no-op, but the hypervisor can
|
|
* use it as a hint that the LMB removal failed.
|
|
*/
|
|
dlpar_unisolate_drc(lmb->drc_index);
|
|
|
|
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 long memblock_size)
|
|
{
|
|
return -EOPNOTSUPP;
|
|
}
|
|
static inline int pseries_remove_mem_node(struct device_node *np)
|
|
{
|
|
return 0;
|
|
}
|
|
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_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 nid, 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;
|
|
}
|
|
|
|
block_sz = memory_block_size_bytes();
|
|
|
|
/* Find the node id for this LMB. Fake one if necessary. */
|
|
nid = of_drconf_to_nid_single(lmb);
|
|
if (nid < 0 || !node_possible(nid))
|
|
nid = first_online_node;
|
|
|
|
/* Add the memory */
|
|
rc = __add_memory(nid, lmb->base_addr, block_sz, MHP_NONE);
|
|
if (rc) {
|
|
invalidate_lmb_associativity_index(lmb);
|
|
return rc;
|
|
}
|
|
|
|
rc = dlpar_online_lmb(lmb);
|
|
if (rc) {
|
|
__remove_memory(lmb->base_addr, block_sz);
|
|
invalidate_lmb_associativity_index(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_reserved = 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_RESERVED)
|
|
continue;
|
|
|
|
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_reserved++;
|
|
if (lmbs_reserved == lmbs_to_add)
|
|
break;
|
|
}
|
|
|
|
if (lmbs_reserved != 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);
|
|
lmbs_reserved--;
|
|
|
|
if (lmbs_reserved == 0)
|
|
break;
|
|
}
|
|
rc = -EINVAL;
|
|
} else {
|
|
for_each_drmem_lmb(lmb) {
|
|
if (!drmem_lmb_reserved(lmb))
|
|
continue;
|
|
|
|
pr_debug("Memory at %llx (drc index %x) was hot-added\n",
|
|
lmb->base_addr, lmb->drc_index);
|
|
drmem_remove_lmb_reservation(lmb);
|
|
lmbs_reserved--;
|
|
|
|
if (lmbs_reserved == 0)
|
|
break;
|
|
}
|
|
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 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) {
|
|
/* Fail immediately if the whole range can't be hot-added */
|
|
if (lmb->flags & DRCONF_MEM_RESERVED) {
|
|
pr_err("Memory at %llx (drc index %x) is reserved\n",
|
|
lmb->base_addr, lmb->drc_index);
|
|
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;
|
|
default:
|
|
pr_err("Invalid action (%d) specified\n", hp_elog->action);
|
|
rc = -EINVAL;
|
|
break;
|
|
}
|
|
|
|
if (!rc)
|
|
rc = drmem_update_dt();
|
|
|
|
unlock_device_hotplug();
|
|
return rc;
|
|
}
|
|
|
|
static int pseries_add_mem_node(struct device_node *np)
|
|
{
|
|
const __be32 *prop;
|
|
unsigned long base;
|
|
unsigned long lmb_size;
|
|
int ret = -EINVAL;
|
|
int addr_cells, size_cells;
|
|
|
|
/*
|
|
* 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
|
|
*/
|
|
prop = of_get_property(np, "reg", NULL);
|
|
if (!prop)
|
|
return ret;
|
|
|
|
addr_cells = of_n_addr_cells(np);
|
|
size_cells = of_n_size_cells(np);
|
|
/*
|
|
* "reg" property represents (addr,size) tuple.
|
|
*/
|
|
base = of_read_number(prop, addr_cells);
|
|
prop += addr_cells;
|
|
lmb_size = of_read_number(prop, size_cells);
|
|
|
|
/*
|
|
* Update memory region to represent the memory add
|
|
*/
|
|
ret = memblock_add(base, lmb_size);
|
|
return (ret < 0) ? -EINVAL : 0;
|
|
}
|
|
|
|
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->dn->name,
|
|
"ibm,dynamic-reconfiguration-memory"))
|
|
drmem_update_lmbs(rd->prop);
|
|
}
|
|
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);
|