[mirror_ubuntu-eoan-kernel.git] / 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 <asm/firmware.h>
#include <asm/machdep.h>
#include <asm/prom.h>
#include <asm/sparsemem.h>
#include "pseries.h"

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;
}

#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;
}
#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;
}
#endif /* CONFIG_MEMORY_HOTREMOVE */

int dlpar_memory(struct pseries_hp_errorlog *hp_elog)
{
	int rc = 0;

	lock_device_hotplug();

	switch (hp_elog->action) {
	default:
		pr_err("Invalid action (%d) specified\n", hp_elog->action);
		rc = -EINVAL;
		break;
	}

	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;

	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);
Commit	Line	Data
57b53926 BP	1	/*
	2	* pseries Memory Hotplug infrastructure.
	3	*
	4	* Copyright (C) 2008 Badari Pulavarty, IBM Corporation
	5	*
	6	* This program is free software; you can redistribute it and/or
	7	* modify it under the terms of the GNU General Public License
	8	* as published by the Free Software Foundation; either version
	9	* 2 of the License, or (at your option) any later version.
	10	*/
	11
999e2dad NF	12	#define pr_fmt(fmt) "pseries-hotplug-mem: " fmt
999e2dad NF	13
57b53926	14	#include <linux/of.h>
26a2056e	15	#include <linux/of_address.h>
95f72d1e	16	#include <linux/memblock.h>
770e1ac5	17	#include <linux/memory.h>
9ac8cde9	18	#include <linux/memory_hotplug.h>
770e1ac5	19
57b53926 BP	20	#include <asm/firmware.h>
57b53926 BP	21	#include <asm/machdep.h>
26a2056e	22	#include <asm/prom.h>
0b2f8287	23	#include <asm/sparsemem.h>
1217d34b	24	#include "pseries.h"
57b53926	25
a5d86257	26	unsigned long pseries_memory_block_size(void)
c540ada2 NF	27	{
c540ada2 NF	28	struct device_node *np;
770e1ac5 BH	29	unsigned int memblock_size = MIN_MEMORY_BLOCK_SIZE;
770e1ac5 BH	30	struct resource r;
c540ada2 NF	31
	32	np = of_find_node_by_path("/ibm,dynamic-reconfiguration-memory");
	33	if (np) {
770e1ac5	34	const __be64 *size;
c540ada2 NF	35
c540ada2 NF	36	size = of_get_property(np, "ibm,lmb-size", NULL);
770e1ac5 BH	37	if (size)
770e1ac5 BH	38	memblock_size = be64_to_cpup(size);
c540ada2	39	of_node_put(np);
770e1ac5 BH	40	} else if (machine_is(pseries)) {
770e1ac5 BH	41	/* This fallback really only applies to pseries */
c540ada2	42	unsigned int memzero_size = 0;
c540ada2 NF	43
	44	np = of_find_node_by_path("/memory@0");
	45	if (np) {
770e1ac5 BH	46	if (!of_address_to_resource(np, 0, &r))
770e1ac5 BH	47	memzero_size = resource_size(&r);
c540ada2 NF	48	of_node_put(np);
	49	}
	50
	51	if (memzero_size) {
	52	/* We now know the size of memory@0, use this to find
	53	* the first memoryblock and get its size.
	54	*/
	55	char buf[64];
	56
	57	sprintf(buf, "/memory@%x", memzero_size);
	58	np = of_find_node_by_path(buf);
	59	if (np) {
770e1ac5 BH	60	if (!of_address_to_resource(np, 0, &r))
770e1ac5 BH	61	memblock_size = resource_size(&r);
c540ada2 NF	62	of_node_put(np);
	63	}
	64	}
	65	}
c540ada2 NF	66	return memblock_size;
	67	}
	68
4edd7cef	69	#ifdef CONFIG_MEMORY_HOTREMOVE
9ac8cde9 NF	70	static int pseries_remove_memblock(unsigned long base, unsigned int memblock_size)
	71	{
	72	unsigned long block_sz, start_pfn;
	73	int sections_per_block;
	74	int i, nid;
92ecd179	75
9fd3f88c	76	start_pfn = base >> PAGE_SHIFT;
04badfd2	77
42dbfc86 LZ	78	lock_device_hotplug();
	79
	80	if (!pfn_valid(start_pfn))
	81	goto out;
04badfd2	82
a5d86257	83	block_sz = pseries_memory_block_size();
9ac8cde9 NF	84	sections_per_block = block_sz / MIN_MEMORY_BLOCK_SIZE;
9ac8cde9 NF	85	nid = memory_add_physaddr_to_nid(base);
57b53926	86
9ac8cde9 NF	87	for (i = 0; i < sections_per_block; i++) {
	88	remove_memory(nid, base, MIN_MEMORY_BLOCK_SIZE);
	89	base += MIN_MEMORY_BLOCK_SIZE;
d760afd4	90	}
57b53926	91
42dbfc86	92	out:
9ac8cde9	93	/* Update memory regions for memory remove */
95f72d1e	94	memblock_remove(base, memblock_size);
42dbfc86	95	unlock_device_hotplug();
9ac8cde9	96	return 0;
57b53926 BP	97	}
57b53926 BP	98
9ac8cde9	99	static int pseries_remove_mem_node(struct device_node *np)
3c3f67ea NF	100	{
3c3f67ea NF	101	const char *type;
c9ac408b	102	const __be32 *regs;
3c3f67ea	103	unsigned long base;
3fdfd990	104	unsigned int lmb_size;
3c3f67ea NF	105	int ret = -EINVAL;
	106
	107	/*
	108	* Check to see if we are actually removing memory
	109	*/
	110	type = of_get_property(np, "device_type", NULL);
	111	if (type == NULL \|\| strcmp(type, "memory") != 0)
	112	return 0;
	113
	114	/*
4646d131	115	* Find the base address and size of the memblock
3c3f67ea NF	116	*/
	117	regs = of_get_property(np, "reg", NULL);
	118	if (!regs)
	119	return ret;
	120
c9ac408b TF	121	base = be64_to_cpu((unsigned long )regs);
c9ac408b TF	122	lmb_size = be32_to_cpu(regs[3]);
3c3f67ea	123
9ac8cde9 NF	124	pseries_remove_memblock(base, lmb_size);
9ac8cde9 NF	125	return 0;
3c3f67ea	126	}
4edd7cef DR	127	#else
	128	static inline int pseries_remove_memblock(unsigned long base,
	129	unsigned int memblock_size)
	130	{
	131	return -EOPNOTSUPP;
	132	}
9ac8cde9	133	static inline int pseries_remove_mem_node(struct device_node *np)
4edd7cef	134	{
f1b3929c	135	return 0;
4edd7cef DR	136	}
4edd7cef DR	137	#endif /* CONFIG_MEMORY_HOTREMOVE */
3c3f67ea	138
999e2dad NF	139	int dlpar_memory(struct pseries_hp_errorlog *hp_elog)
	140	{
	141	int rc = 0;
	142
	143	lock_device_hotplug();
	144
	145	switch (hp_elog->action) {
	146	default:
	147	pr_err("Invalid action (%d) specified\n", hp_elog->action);
	148	rc = -EINVAL;
	149	break;
	150	}
	151
	152	unlock_device_hotplug();
	153	return rc;
	154	}
	155
9ac8cde9	156	static int pseries_add_mem_node(struct device_node *np)
98d5c21c BP	157	{
98d5c21c BP	158	const char *type;
c9ac408b	159	const __be32 *regs;
92ecd179	160	unsigned long base;
3fdfd990	161	unsigned int lmb_size;
98d5c21c BP	162	int ret = -EINVAL;
	163
	164	/*
	165	* Check to see if we are actually adding memory
	166	*/
	167	type = of_get_property(np, "device_type", NULL);
	168	if (type == NULL \|\| strcmp(type, "memory") != 0)
	169	return 0;
	170
	171	/*
95f72d1e	172	* Find the base and size of the memblock
98d5c21c	173	*/
98d5c21c BP	174	regs = of_get_property(np, "reg", NULL);
	175	if (!regs)
	176	return ret;
	177
c9ac408b TF	178	base = be64_to_cpu((unsigned long )regs);
c9ac408b TF	179	lmb_size = be32_to_cpu(regs[3]);
98d5c21c BP	180
	181	/*
	182	* Update memory region to represent the memory add
	183	*/
3fdfd990	184	ret = memblock_add(base, lmb_size);
3c3f67ea NF	185	return (ret < 0) ? -EINVAL : 0;
	186	}
	187
f5242e5a	188	static int pseries_update_drconf_memory(struct of_reconfig_data *pr)
3c3f67ea	189	{
1cf3d8b3	190	struct of_drconf_cell new_drmem, old_drmem;
c540ada2	191	unsigned long memblock_size;
1cf3d8b3	192	u32 entries;
c9ac408b	193	__be32 *p;
1cf3d8b3	194	int i, rc = -EINVAL;
3c3f67ea	195
a5d86257	196	memblock_size = pseries_memory_block_size();
c540ada2	197	if (!memblock_size)
3c3f67ea NF	198	return -EINVAL;
3c3f67ea NF	199
c9ac408b	200	p = (__be32 *) pr->old_prop->value;
1cf3d8b3 NF	201	if (!p)
	202	return -EINVAL;
	203
	204	/* The first int of the property is the number of lmb's described
	205	* by the property. This is followed by an array of of_drconf_cell
4646d131	206	* entries. Get the number of entries and skip to the array of
1cf3d8b3 NF	207	* of_drconf_cell's.
1cf3d8b3 NF	208	*/
c9ac408b	209	entries = be32_to_cpu(*p++);
1cf3d8b3 NF	210	old_drmem = (struct of_drconf_cell *)p;
1cf3d8b3 NF	211
c9ac408b	212	p = (__be32 *)pr->prop->value;
1cf3d8b3 NF	213	p++;
	214	new_drmem = (struct of_drconf_cell *)p;
	215
	216	for (i = 0; i < entries; i++) {
c9ac408b TF	217	if ((be32_to_cpu(old_drmem[i].flags) & DRCONF_MEM_ASSIGNED) &&
	218	(!(be32_to_cpu(new_drmem[i].flags) & DRCONF_MEM_ASSIGNED))) {
	219	rc = pseries_remove_memblock(
	220	be64_to_cpu(old_drmem[i].base_addr),
1cf3d8b3 NF	221	memblock_size);
1cf3d8b3 NF	222	break;
c9ac408b TF	223	} else if ((!(be32_to_cpu(old_drmem[i].flags) &
	224	DRCONF_MEM_ASSIGNED)) &&
	225	(be32_to_cpu(new_drmem[i].flags) &
	226	DRCONF_MEM_ASSIGNED)) {
	227	rc = memblock_add(be64_to_cpu(old_drmem[i].base_addr),
1cf3d8b3 NF	228	memblock_size);
	229	rc = (rc < 0) ? -EINVAL : 0;
	230	break;
	231	}
3c3f67ea	232	}
3c3f67ea	233	return rc;
98d5c21c BP	234	}
98d5c21c BP	235
57b53926	236	static int pseries_memory_notifier(struct notifier_block *nb,
f5242e5a	237	unsigned long action, void *data)
57b53926	238	{
f5242e5a	239	struct of_reconfig_data *rd = data;
de2780a3	240	int err = 0;
57b53926 BP	241
57b53926 BP	242	switch (action) {
1cf3d8b3	243	case OF_RECONFIG_ATTACH_NODE:
f5242e5a	244	err = pseries_add_mem_node(rd->dn);
57b53926	245	break;
1cf3d8b3	246	case OF_RECONFIG_DETACH_NODE:
f5242e5a	247	err = pseries_remove_mem_node(rd->dn);
57b53926	248	break;
1cf3d8b3	249	case OF_RECONFIG_UPDATE_PROPERTY:
f5242e5a GL	250	if (!strcmp(rd->prop->name, "ibm,dynamic-memory"))
f5242e5a GL	251	err = pseries_update_drconf_memory(rd);
57b53926 BP	252	break;
57b53926 BP	253	}
de2780a3	254	return notifier_from_errno(err);
57b53926 BP	255	}
	256
	257	static struct notifier_block pseries_mem_nb = {
	258	.notifier_call = pseries_memory_notifier,
	259	};
	260
	261	static int __init pseries_memory_hotplug_init(void)
	262	{
	263	if (firmware_has_feature(FW_FEATURE_LPAR))
1cf3d8b3	264	of_reconfig_notifier_register(&pseries_mem_nb);
57b53926 BP	265
	266	return 0;
	267	}
	268	machine_device_initcall(pseries, pseries_memory_hotplug_init);