arch/powerpc/platforms/pseries/hotplug-memory.c - maze/linux - Git at Google

 /*
  * 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.
  */

 #include <linux/of.h>
 #include <linux/of_address.h>
 #include <linux/memblock.h>
 #include <linux/vmalloc.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>

 static unsigned long get_memblock_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;
 }

 /* WARNING: This is going to override the generic definition whenever
  * pseries is built-in regardless of what platform is active at boot
  * time. This is fine for now as this is the only "option" and it
  * should work everywhere. If not, we'll have to turn this into a
  * ppc_md. callback
  */
 unsigned long memory_block_size_bytes(void)
 {
 	return get_memblock_size();
 }

 #ifdef CONFIG_MEMORY_HOTREMOVE
 static int pseries_remove_memory(u64 start, u64 size)
 {
 	int ret;

 	/* Remove htab bolted mappings for this section of memory */
 	start = (unsigned long)__va(start);
 	ret = remove_section_mapping(start, start + size);

 	/* Ensure all vmalloc mappings are flushed in case they also
 	 * hit that section of memory
 	 */
 	vm_unmap_aliases();

 	return ret;
 }

 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 = memory_block_size_bytes();
 	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 unsigned int *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 bae address and size of the memblock
 	 */
 	regs = of_get_property(np, "reg", NULL);
 	if (!regs)
 		return ret;

 	base = *(unsigned long *)regs;
 	lmb_size = 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 -EOPNOTSUPP;
 }
 #endif /* CONFIG_MEMORY_HOTREMOVE */

 static int pseries_add_mem_node(struct device_node *np)
 {
 	const char *type;
 	const unsigned int *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 = *(unsigned long *)regs;
 	lmb_size = 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_prop_reconfig *pr)
 {
 	struct of_drconf_cell *new_drmem, *old_drmem;
 	unsigned long memblock_size;
 	u32 entries;
 	u32 *p;
 	int i, rc = -EINVAL;

 	memblock_size = get_memblock_size();
 	if (!memblock_size)
 		return -EINVAL;

 	p = (u32 *)of_get_property(pr->dn, "ibm,dynamic-memory", NULL);
 	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 niumber of entries and skip to the array of
 	 * of_drconf_cell's.
 	 */
 	entries = *p++;
 	old_drmem = (struct of_drconf_cell *)p;

 	p = (u32 *)pr->prop->value;
 	p++;
 	new_drmem = (struct of_drconf_cell *)p;

 	for (i = 0; i < entries; i++) {
 		if ((old_drmem[i].flags & DRCONF_MEM_ASSIGNED) &&
 		    (!(new_drmem[i].flags & DRCONF_MEM_ASSIGNED))) {
 			rc = pseries_remove_memblock(old_drmem[i].base_addr,
 						     memblock_size);
 			break;
 		} else if ((!(old_drmem[i].flags & DRCONF_MEM_ASSIGNED)) &&
 			   (new_drmem[i].flags & DRCONF_MEM_ASSIGNED)) {
 			rc = memblock_add(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 *node)
 {
 	struct of_prop_reconfig *pr;
 	int err = 0;

 	switch (action) {
 	case OF_RECONFIG_ATTACH_NODE:
 		err = pseries_add_mem_node(node);
 		break;
 	case OF_RECONFIG_DETACH_NODE:
 		err = pseries_remove_mem_node(node);
 		break;
 	case OF_RECONFIG_UPDATE_PROPERTY:
 		pr = (struct of_prop_reconfig *)node;
 		if (!strcmp(pr->prop->name, "ibm,dynamic-memory"))
 			err = pseries_update_drconf_memory(pr);
 		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);

 #ifdef CONFIG_MEMORY_HOTREMOVE
 	ppc_md.remove_memory = pseries_remove_memory;
 #endif

 	return 0;
 }
 machine_device_initcall(pseries, pseries_memory_hotplug_init);
	/*
	* 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.
	*/

	#include <linux/of.h>
	#include <linux/of_address.h>
	#include <linux/memblock.h>
	#include <linux/vmalloc.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>

	static unsigned long get_memblock_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;
	}

	/* WARNING: This is going to override the generic definition whenever
	* pseries is built-in regardless of what platform is active at boot
	* time. This is fine for now as this is the only "option" and it
	* should work everywhere. If not, we'll have to turn this into a
	* ppc_md. callback
	*/
	unsigned long memory_block_size_bytes(void)
	{
	return get_memblock_size();
	}

	#ifdef CONFIG_MEMORY_HOTREMOVE
	static int pseries_remove_memory(u64 start, u64 size)
	{
	int ret;

	/* Remove htab bolted mappings for this section of memory */
	start = (unsigned long)__va(start);
	ret = remove_section_mapping(start, start + size);

	/* Ensure all vmalloc mappings are flushed in case they also
	* hit that section of memory
	*/
	vm_unmap_aliases();

	return ret;
	}

	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 = memory_block_size_bytes();
	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 unsigned int *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 bae address and size of the memblock
	*/
	regs = of_get_property(np, "reg", NULL);
	if (!regs)
	return ret;

	base = (unsigned long )regs;
	lmb_size = 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 -EOPNOTSUPP;
	}
	#endif /* CONFIG_MEMORY_HOTREMOVE */

	static int pseries_add_mem_node(struct device_node *np)
	{
	const char *type;
	const unsigned int *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 = (unsigned long )regs;
	lmb_size = 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_prop_reconfig *pr)
	{
	struct of_drconf_cell new_drmem, old_drmem;
	unsigned long memblock_size;
	u32 entries;
	u32 *p;
	int i, rc = -EINVAL;

	memblock_size = get_memblock_size();
	if (!memblock_size)
	return -EINVAL;

	p = (u32 *)of_get_property(pr->dn, "ibm,dynamic-memory", NULL);
	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 niumber of entries and skip to the array of
	* of_drconf_cell's.
	*/
	entries = *p++;
	old_drmem = (struct of_drconf_cell *)p;

	p = (u32 *)pr->prop->value;
	p++;
	new_drmem = (struct of_drconf_cell *)p;

	for (i = 0; i < entries; i++) {
	if ((old_drmem[i].flags & DRCONF_MEM_ASSIGNED) &&
	(!(new_drmem[i].flags & DRCONF_MEM_ASSIGNED))) {
	rc = pseries_remove_memblock(old_drmem[i].base_addr,
	memblock_size);
	break;
	} else if ((!(old_drmem[i].flags & DRCONF_MEM_ASSIGNED)) &&
	(new_drmem[i].flags & DRCONF_MEM_ASSIGNED)) {
	rc = memblock_add(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 *node)
	{
	struct of_prop_reconfig *pr;
	int err = 0;

	switch (action) {
	case OF_RECONFIG_ATTACH_NODE:
	err = pseries_add_mem_node(node);
	break;
	case OF_RECONFIG_DETACH_NODE:
	err = pseries_remove_mem_node(node);
	break;
	case OF_RECONFIG_UPDATE_PROPERTY:
	pr = (struct of_prop_reconfig *)node;
	if (!strcmp(pr->prop->name, "ibm,dynamic-memory"))
	err = pseries_update_drconf_memory(pr);
	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);

	#ifdef CONFIG_MEMORY_HOTREMOVE
	ppc_md.remove_memory = pseries_remove_memory;
	#endif

	return 0;
	}
	machine_device_initcall(pseries, pseries_memory_hotplug_init);