2017-12-02 00:47:08 +08:00
|
|
|
/*
|
|
|
|
* Dynamic reconfiguration memory support
|
|
|
|
*
|
|
|
|
* Copyright 2017 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) "drmem: " fmt
|
|
|
|
|
|
|
|
#include <linux/kernel.h>
|
|
|
|
#include <linux/of.h>
|
|
|
|
#include <linux/of_fdt.h>
|
|
|
|
#include <linux/memblock.h>
|
|
|
|
#include <asm/prom.h>
|
|
|
|
#include <asm/drmem.h>
|
|
|
|
|
|
|
|
static struct drmem_lmb_info __drmem_info;
|
|
|
|
struct drmem_lmb_info *drmem_info = &__drmem_info;
|
|
|
|
|
2017-12-02 00:47:21 +08:00
|
|
|
u64 drmem_lmb_memory_max(void)
|
|
|
|
{
|
|
|
|
struct drmem_lmb *last_lmb;
|
|
|
|
|
|
|
|
last_lmb = &drmem_info->lmbs[drmem_info->n_lmbs - 1];
|
|
|
|
return last_lmb->base_addr + drmem_lmb_size();
|
|
|
|
}
|
|
|
|
|
2017-12-02 00:47:31 +08:00
|
|
|
static u32 drmem_lmb_flags(struct drmem_lmb *lmb)
|
|
|
|
{
|
|
|
|
/*
|
|
|
|
* Return the value of the lmb flags field minus the reserved
|
|
|
|
* bit used internally for hotplug processing.
|
|
|
|
*/
|
|
|
|
return lmb->flags & ~DRMEM_LMB_RESERVED;
|
|
|
|
}
|
|
|
|
|
|
|
|
static struct property *clone_property(struct property *prop, u32 prop_sz)
|
|
|
|
{
|
|
|
|
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_sz, GFP_KERNEL);
|
|
|
|
if (!new_prop->name || !new_prop->value) {
|
|
|
|
kfree(new_prop->name);
|
|
|
|
kfree(new_prop->value);
|
|
|
|
kfree(new_prop);
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
|
|
|
|
new_prop->length = prop_sz;
|
|
|
|
#if defined(CONFIG_OF_DYNAMIC)
|
|
|
|
of_property_set_flag(new_prop, OF_DYNAMIC);
|
|
|
|
#endif
|
|
|
|
return new_prop;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int drmem_update_dt_v1(struct device_node *memory,
|
|
|
|
struct property *prop)
|
|
|
|
{
|
|
|
|
struct property *new_prop;
|
2017-12-02 00:47:42 +08:00
|
|
|
struct of_drconf_cell_v1 *dr_cell;
|
2017-12-02 00:47:31 +08:00
|
|
|
struct drmem_lmb *lmb;
|
|
|
|
u32 *p;
|
|
|
|
|
|
|
|
new_prop = clone_property(prop, prop->length);
|
|
|
|
if (!new_prop)
|
|
|
|
return -1;
|
|
|
|
|
|
|
|
p = new_prop->value;
|
|
|
|
*p++ = cpu_to_be32(drmem_info->n_lmbs);
|
|
|
|
|
2017-12-02 00:47:42 +08:00
|
|
|
dr_cell = (struct of_drconf_cell_v1 *)p;
|
2017-12-02 00:47:31 +08:00
|
|
|
|
|
|
|
for_each_drmem_lmb(lmb) {
|
|
|
|
dr_cell->base_addr = cpu_to_be64(lmb->base_addr);
|
|
|
|
dr_cell->drc_index = cpu_to_be32(lmb->drc_index);
|
|
|
|
dr_cell->aa_index = cpu_to_be32(lmb->aa_index);
|
|
|
|
dr_cell->flags = cpu_to_be32(drmem_lmb_flags(lmb));
|
|
|
|
|
|
|
|
dr_cell++;
|
|
|
|
}
|
|
|
|
|
|
|
|
of_update_property(memory, new_prop);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
int drmem_update_dt(void)
|
|
|
|
{
|
|
|
|
struct device_node *memory;
|
|
|
|
struct property *prop;
|
|
|
|
int rc = -1;
|
|
|
|
|
|
|
|
memory = of_find_node_by_path("/ibm,dynamic-reconfiguration-memory");
|
|
|
|
if (!memory)
|
|
|
|
return -1;
|
|
|
|
|
|
|
|
prop = of_find_property(memory, "ibm,dynamic-memory", NULL);
|
|
|
|
if (prop)
|
|
|
|
rc = drmem_update_dt_v1(memory, prop);
|
|
|
|
|
|
|
|
of_node_put(memory);
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
2017-12-02 00:47:08 +08:00
|
|
|
static void __init read_drconf_v1_cell(struct drmem_lmb *lmb,
|
|
|
|
const __be32 **prop)
|
|
|
|
{
|
|
|
|
const __be32 *p = *prop;
|
|
|
|
|
|
|
|
lmb->base_addr = dt_mem_next_cell(dt_root_addr_cells, &p);
|
|
|
|
lmb->drc_index = of_read_number(p++, 1);
|
|
|
|
|
|
|
|
p++; /* skip reserved field */
|
|
|
|
|
|
|
|
lmb->aa_index = of_read_number(p++, 1);
|
|
|
|
lmb->flags = of_read_number(p++, 1);
|
|
|
|
|
|
|
|
*prop = p;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void __init __walk_drmem_v1_lmbs(const __be32 *prop, const __be32 *usm,
|
|
|
|
void (*func)(struct drmem_lmb *, const __be32 **))
|
|
|
|
{
|
|
|
|
struct drmem_lmb lmb;
|
|
|
|
u32 i, n_lmbs;
|
|
|
|
|
|
|
|
n_lmbs = of_read_number(prop++, 1);
|
|
|
|
|
|
|
|
for (i = 0; i < n_lmbs; i++) {
|
|
|
|
read_drconf_v1_cell(&lmb, &prop);
|
|
|
|
func(&lmb, &usm);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2017-12-02 00:47:21 +08:00
|
|
|
#ifdef CONFIG_PPC_PSERIES
|
2017-12-02 00:47:08 +08:00
|
|
|
void __init walk_drmem_lmbs_early(unsigned long node,
|
|
|
|
void (*func)(struct drmem_lmb *, const __be32 **))
|
|
|
|
{
|
|
|
|
const __be32 *prop, *usm;
|
|
|
|
int len;
|
|
|
|
|
|
|
|
prop = of_get_flat_dt_prop(node, "ibm,lmb-size", &len);
|
|
|
|
if (!prop || len < dt_root_size_cells * sizeof(__be32))
|
|
|
|
return;
|
|
|
|
|
|
|
|
drmem_info->lmb_size = dt_mem_next_cell(dt_root_size_cells, &prop);
|
|
|
|
|
|
|
|
usm = of_get_flat_dt_prop(node, "linux,drconf-usable-memory", &len);
|
|
|
|
|
|
|
|
prop = of_get_flat_dt_prop(node, "ibm,dynamic-memory", &len);
|
|
|
|
if (prop)
|
|
|
|
__walk_drmem_v1_lmbs(prop, usm, func);
|
|
|
|
|
|
|
|
memblock_dump_all();
|
|
|
|
}
|
|
|
|
|
|
|
|
#endif
|
2017-12-02 00:47:21 +08:00
|
|
|
|
|
|
|
static int __init init_drmem_lmb_size(struct device_node *dn)
|
|
|
|
{
|
|
|
|
const __be32 *prop;
|
|
|
|
int len;
|
|
|
|
|
|
|
|
if (drmem_info->lmb_size)
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
prop = of_get_property(dn, "ibm,lmb-size", &len);
|
|
|
|
if (!prop || len < dt_root_size_cells * sizeof(__be32)) {
|
|
|
|
pr_info("Could not determine LMB size\n");
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
|
|
|
|
drmem_info->lmb_size = dt_mem_next_cell(dt_root_size_cells, &prop);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Returns the property linux,drconf-usable-memory if
|
|
|
|
* it exists (the property exists only in kexec/kdump kernels,
|
|
|
|
* added by kexec-tools)
|
|
|
|
*/
|
|
|
|
static const __be32 *of_get_usable_memory(struct device_node *dn)
|
|
|
|
{
|
|
|
|
const __be32 *prop;
|
|
|
|
u32 len;
|
|
|
|
|
|
|
|
prop = of_get_property(dn, "linux,drconf-usable-memory", &len);
|
|
|
|
if (!prop || len < sizeof(unsigned int))
|
|
|
|
return NULL;
|
|
|
|
|
|
|
|
return prop;
|
|
|
|
}
|
|
|
|
|
|
|
|
void __init walk_drmem_lmbs(struct device_node *dn,
|
|
|
|
void (*func)(struct drmem_lmb *, const __be32 **))
|
|
|
|
{
|
|
|
|
const __be32 *prop, *usm;
|
|
|
|
|
|
|
|
if (init_drmem_lmb_size(dn))
|
|
|
|
return;
|
|
|
|
|
|
|
|
usm = of_get_usable_memory(dn);
|
|
|
|
|
|
|
|
prop = of_get_property(dn, "ibm,dynamic-memory", NULL);
|
|
|
|
if (prop)
|
|
|
|
__walk_drmem_v1_lmbs(prop, usm, func);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void __init init_drmem_v1_lmbs(const __be32 *prop)
|
|
|
|
{
|
|
|
|
struct drmem_lmb *lmb;
|
|
|
|
|
|
|
|
drmem_info->n_lmbs = of_read_number(prop++, 1);
|
|
|
|
|
|
|
|
drmem_info->lmbs = kcalloc(drmem_info->n_lmbs, sizeof(*lmb),
|
|
|
|
GFP_KERNEL);
|
|
|
|
if (!drmem_info->lmbs)
|
|
|
|
return;
|
|
|
|
|
|
|
|
for_each_drmem_lmb(lmb)
|
|
|
|
read_drconf_v1_cell(lmb, &prop);
|
|
|
|
}
|
|
|
|
|
|
|
|
static int __init drmem_init(void)
|
|
|
|
{
|
|
|
|
struct device_node *dn;
|
|
|
|
const __be32 *prop;
|
|
|
|
|
|
|
|
dn = of_find_node_by_path("/ibm,dynamic-reconfiguration-memory");
|
|
|
|
if (!dn) {
|
|
|
|
pr_info("No dynamic reconfiguration memory found\n");
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (init_drmem_lmb_size(dn)) {
|
|
|
|
of_node_put(dn);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
prop = of_get_property(dn, "ibm,dynamic-memory", NULL);
|
|
|
|
if (prop)
|
|
|
|
init_drmem_v1_lmbs(prop);
|
|
|
|
|
|
|
|
of_node_put(dn);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
late_initcall(drmem_init);
|