Release 4.14 arch/powerpc/platforms/pseries/hotplug-memory.c
/*
* 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 <asm/fadump.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;
}
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Nathan Fontenot | 139 | 73.94% | 1 | 33.33% |
Benjamin Herrenschmidt | 48 | 25.53% | 1 | 33.33% |
Anton Blanchard | 1 | 0.53% | 1 | 33.33% |
Total | 188 | 100.00% | 3 | 100.00% |
static void dlpar_free_property(struct property *prop)
{
kfree(prop->name);
kfree(prop->value);
kfree(prop);
}
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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;
}
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Nathan Fontenot | 119 | 100.00% | 2 | 100.00% |
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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 = dlpar_clone_property(prop, prop->length);
if (!new_prop)
return NULL;
/* 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].aa_index = be32_to_cpu(lmbs[i].aa_index);
lmbs[i].flags = be32_to_cpu(lmbs[i].flags);
}
return new_prop;
}
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Nathan Fontenot | 173 | 91.05% | 2 | 66.67% |
Michael Bringmann | 17 | 8.95% | 1 | 33.33% |
Total | 190 | 100.00% | 3 | 100.00% |
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].aa_index = cpu_to_be32(lmbs[i].aa_index);
lmbs[i].flags = cpu_to_be32(lmbs[i].flags);
}
rtas_hp_event = true;
of_update_property(dn, prop);
rtas_hp_event = false;
}
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Nathan Fontenot | 144 | 89.44% | 1 | 50.00% |
Michael Bringmann | 17 | 10.56% | 1 | 50.00% |
Total | 161 | 100.00% | 2 | 100.00% |
static int dlpar_update_device_tree_lmb(struct of_drconf_cell *lmb)
{
struct device_node *dn;
struct property *prop;
struct of_drconf_cell *lmbs;
u32 *p, num_lmbs;
int i;
dn = of_find_node_by_path("/ibm,dynamic-reconfiguration-memory");
if (!dn)
return -ENODEV;
prop = dlpar_clone_drconf_property(dn);
if (!prop) {
of_node_put(dn);
return -ENODEV;
}
p = prop->value;
num_lmbs = *p++;
lmbs = (struct of_drconf_cell *)p;
for (i = 0; i < num_lmbs; i++) {
if (lmbs[i].drc_index == lmb->drc_index) {
lmbs[i].flags = lmb->flags;
lmbs[i].aa_index = lmb->aa_index;
dlpar_update_drconf_property(dn, prop);
break;
}
}
of_node_put(dn);
return 0;
}
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Nathan Fontenot | 163 | 100.00% | 1 | 100.00% |
Total | 163 | 100.00% | 1 | 100.00% |
static u32 find_aa_index(struct device_node *dr_node,
struct property *ala_prop, const u32 *lmb_assoc)
{
u32 *assoc_arrays;
u32 aa_index;
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);
aa_index = -1;
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;
break;
}
if (aa_index == -1) {
struct property *new_prop;
u32 new_prop_size;
new_prop_size = ala_prop->length + aa_array_sz;
new_prop = dlpar_clone_property(ala_prop, new_prop_size);
if (!new_prop)
return -1;
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 aa_index;
}
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Total | 242 | 100.00% | 1 | 100.00% |
static u32 lookup_lmb_associativity_index(struct of_drconf_cell *lmb)
{
struct device_node *parent, *lmb_node, *dr_node;
struct property *ala_prop;
const u32 *lmb_assoc;
u32 aa_index;
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;
}
aa_index = find_aa_index(dr_node, ala_prop, lmb_assoc);
dlpar_free_cc_nodes(lmb_node);
return aa_index;
}
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Total | 180 | 100.00% | 2 | 100.00% |
static int dlpar_add_device_tree_lmb(struct of_drconf_cell *lmb)
{
int aa_index;
lmb->flags |= DRCONF_MEM_ASSIGNED;
aa_index = lookup_lmb_associativity_index(lmb);
if (aa_index < 0) {
pr_err("Couldn't find associativity index for drc index %x\n",
lmb->drc_index);
return aa_index;
}
lmb->aa_index = aa_index;
return dlpar_update_device_tree_lmb(lmb);
}
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static int dlpar_remove_device_tree_lmb(struct of_drconf_cell *lmb)
{
lmb->flags &= ~DRCONF_MEM_ASSIGNED;
lmb->aa_index = 0xffffffff;
return dlpar_update_device_tree_lmb(lmb);
}
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Nathan Fontenot | 30 | 100.00% | 1 | 100.00% |
Total | 30 | 100.00% | 1 | 100.00% |
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;
}
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Nathan Fontenot | 56 | 100.00% | 1 | 100.00% |
Total | 56 | 100.00% | 1 | 100.00% |
static int dlpar_change_lmb_state(struct of_drconf_cell *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;
}
Contributors
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Nathan Fontenot | 97 | 100.00% | 1 | 100.00% |
Total | 97 | 100.00% | 1 | 100.00% |
static int dlpar_online_lmb(struct of_drconf_cell *lmb)
{
return dlpar_change_lmb_state(lmb, true);
}
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Nathan Fontenot | 19 | 100.00% | 1 | 100.00% |
Total | 19 | 100.00% | 1 | 100.00% |
#ifdef CONFIG_MEMORY_HOTREMOVE
static int dlpar_offline_lmb(struct of_drconf_cell *lmb)
{
return dlpar_change_lmb_state(lmb, false);
}
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Nathan Fontenot | 19 | 100.00% | 1 | 100.00% |
Total | 19 | 100.00% | 1 | 100.00% |
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;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Nathan Fontenot | 80 | 72.73% | 4 | 44.44% |
Yasuaki Ishimatsu | 15 | 13.64% | 2 | 22.22% |
Li Zhong | 11 | 10.00% | 1 | 11.11% |
Yinghai Lu | 3 | 2.73% | 1 | 11.11% |
Anton Blanchard | 1 | 0.91% | 1 | 11.11% |
Total | 110 | 100.00% | 9 | 100.00% |
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;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Badari Pulavarty | 84 | 71.19% | 2 | 25.00% |
Nathan Fontenot | 22 | 18.64% | 2 | 25.00% |
Thomas Falcon | 7 | 5.93% | 1 | 12.50% |
Benjamin Herrenschmidt | 3 | 2.54% | 1 | 12.50% |
Yinghai Lu | 1 | 0.85% | 1 | 12.50% |
Li Zhong | 1 | 0.85% | 1 | 12.50% |
Total | 118 | 100.00% | 8 | 100.00% |
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;
#ifdef CONFIG_FA_DUMP
/* Don't hot-remove memory that falls in fadump boot memory area */
if (is_fadump_boot_memory_area(phys_addr, block_sz))
return false;
#endif
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;
}
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Nathan Fontenot | 112 | 86.15% | 1 | 50.00% |
Hari Bathini | 18 | 13.85% | 1 | 50.00% |
Total | 130 | 100.00% | 2 | 100.00% |
static int dlpar_add_lmb(struct of_drconf_cell *);
static int dlpar_remove_lmb(struct of_drconf_cell *lmb)
{
unsigned long block_sz;
int nid, rc;
if (!lmb_is_removable(lmb))
return -EINVAL;
rc = dlpar_offline_lmb(lmb);
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_remove_device_tree_lmb(lmb);
return 0;
}
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Nathan Fontenot | 89 | 100.00% | 3 | 100.00% |
Total | 89 | 100.00% | 3 | 100.00% |
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 (lmb_is_removable(&lmbs[i]))
lmbs_available++;
}
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 (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;
dlpar_release_drc(lmbs[i].drc_index);
pr_info("Memory at %llx was hot-removed\n",
lmbs[i].base_addr);
lmbs[i].reserved = 0;
}
rc = 0;
}
return rc;
}
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Total | 324 | 100.00% | 3 | 100.00% |
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]);
if (!rc)
dlpar_release_drc(lmbs[i].drc_index);
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;
}
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Nathan Fontenot | 151 | 90.96% | 1 | 50.00% |
John Allen | 15 | 9.04% | 1 | 50.00% |
Total | 166 | 100.00% | 2 | 100.00% |
static int dlpar_memory_readd_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 update 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]);
if (!rc) {
rc = dlpar_add_lmb(&lmbs[i]);
if (rc)
dlpar_release_drc(lmbs[i].drc_index);
}
break;
}
}
if (!lmb_found)
rc = -EINVAL;
if (rc)
pr_info("Failed to update memory at %llx\n",
lmbs[i].base_addr);
else
pr_info("Memory at %llx was updated\n", lmbs[i].base_addr);
return rc;
}
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Total | 183 | 100.00% | 1 | 100.00% |
static int dlpar_memory_remove_by_ic(u32 lmbs_to_remove, u32 drc_index,
struct property *prop)
{
struct of_drconf_cell *lmbs;
u32 num_lmbs, *p;
int i, rc, start_lmb_found;
int lmbs_available = 0, start_index = 0, end_index;
pr_info("Attempting to hot-remove %u LMB(s) at %x\n",
lmbs_to_remove, drc_index);
if (lmbs_to_remove == 0)
return -EINVAL;
p = prop->value;
num_lmbs = *p++;
lmbs = (struct of_drconf_cell *)p;
start_lmb_found = 0;
/* Navigate to drc_index */
while (start_index < num_lmbs) {
if (lmbs[start_index].drc_index == drc_index) {
start_lmb_found = 1;
break;
}
start_index++;
}
if (!start_lmb_found)
return -EINVAL;
end_index = start_index + lmbs_to_remove