s390/numa: add emulation support

	  Specify the maximum number of NUMA nodes available on the target

	  system. Increases memory reserved to accommodate various tables.

menu "Select NUMA modes"

	depends on NUMA

config NUMA_EMU

	bool "NUMA emulation"

	default y

	help

	  Numa emulation mode will split the available system memory into

	  equal chunks which then are distributed over the configured number

	  of nodes in a round-robin manner.

	  The number of fake nodes is limited by the number of available memory

	  chunks (i.e. memory size / fake size) and the number of supported

	  nodes in the kernel.

	  The CPUs are assigned to the nodes in a way that partially respects

	  the original machine topology (if supported by the machine).

	  Fair distribution of the CPUs is not guaranteed.

config EMU_SIZE

	hex "NUMA emulation memory chunk size"

	default 0x10000000

	range 0x400000 0x100000000

	depends on NUMA_EMU

	help

	  Select the default size by which the memory is chopped and then

	  assigned to emulated NUMA nodes.

	  This can be overridden by specifying

	  emu_size=<n>

	  on the kernel command line where also suffixes K, M, G, and T are

	  supported.

endmenu

config SCHED_MC

	def_bool n

static inline void numa_setup(void) { }

static inline void numa_update_cpu_topology(void) { }

static inline int numa_pfn_to_nid(unsigned long pfn)

{

	return 0;

}

#endif /* CONFIG_NUMA */

#endif /* _ASM_S390_NUMA_H */

obj-y			+= numa.o

obj-y			+= toptree.o

obj-$(CONFIG_NUMA_EMU)	+= mode_emu.o

/*

 * NUMA support for s390

 *

 * NUMA emulation (aka fake NUMA) distributes the available memory to nodes

 * without using real topology information about the physical memory of the

 * machine.

 *

 * It distributes the available CPUs to nodes while respecting the original

 * machine topology information. This is done by trying to avoid to separate

 * CPUs which reside on the same book or even on the same MC.

 *

 * Because the current Linux scheduler code requires a stable cpu to node

 * mapping, cores are pinned to nodes when the first CPU thread is set online.

 *

 * Copyright IBM Corp. 2015

 */

#define KMSG_COMPONENT "numa_emu"

#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt

#include <linux/kernel.h>

#include <linux/cpumask.h>

#include <linux/memblock.h>

#include <linux/node.h>

#include <linux/memory.h>

#include <asm/smp.h>

#include <asm/topology.h>

#include "numa_mode.h"

#include "toptree.h"

/* Distances between the different system components */

#define DIST_EMPTY	0

#define DIST_CORE	1

#define DIST_MC		2

#define DIST_BOOK	3

#define DIST_MAX	4

/* Node distance reported to common code */

#define EMU_NODE_DIST	10

/* Node ID for free (not yet pinned) cores */

#define NODE_ID_FREE	-1

/* Different levels of toptree */

enum toptree_level {CORE, MC, BOOK, NODE, TOPOLOGY};

/* The two toptree IDs */

enum {TOPTREE_ID_PHYS, TOPTREE_ID_NUMA};

/* Number of NUMA nodes */

static int emu_nodes = 1;

/* NUMA stripe size */

static unsigned long emu_size;

/* Pinned core to node mapping */

static int cores_to_node_id[CONFIG_NR_CPUS];

/* Total number of pinned cores */

static int cores_total;

/* Number of cores per node without extra cores */

static int cores_per_node_target;

/* Number of cores pinned to node */

static int cores_per_node[MAX_NUMNODES];

/*

 * Pin a core to a node

 */

static void pin_core_to_node(int core_id, int node_id)

{

	if (cores_to_node_id[core_id] == NODE_ID_FREE) {

		cores_per_node[node_id]++;

		cores_to_node_id[core_id] = node_id;

		cores_total++;

	} else {

		WARN_ON(cores_to_node_id[core_id] != node_id);

	}

}

/*

 * Number of pinned cores of a node

 */

static int cores_pinned(struct toptree *node)

{

	return cores_per_node[node->id];

}

/*

 * ID of the node where the core is pinned (or NODE_ID_FREE)

 */

static int core_pinned_to_node_id(struct toptree *core)

{

	return cores_to_node_id[core->id];

}

/*

 * Number of cores in the tree that are not yet pinned

 */

static int cores_free(struct toptree *tree)

{

	struct toptree *core;

	int count = 0;

	toptree_for_each(core, tree, CORE) {

		if (core_pinned_to_node_id(core) == NODE_ID_FREE)

			count++;

	}

	return count;

}

/*

 * Return node of core

 */

static struct toptree *core_node(struct toptree *core)

{

	return core->parent->parent->parent;

}

/*

 * Return book of core

 */

static struct toptree *core_book(struct toptree *core)

{

	return core->parent->parent;

}

/*

 * Return mc of core

 */

static struct toptree *core_mc(struct toptree *core)

{

	return core->parent;

}

/*

 * Distance between two cores

 */

static int dist_core_to_core(struct toptree *core1, struct toptree *core2)

{

	if (core_book(core1)->id != core_book(core2)->id)

		return DIST_BOOK;

	if (core_mc(core1)->id != core_mc(core2)->id)

		return DIST_MC;

	/* Same core or sibling on same MC */

	return DIST_CORE;

}

/*

 * Distance of a node to a core

 */

static int dist_node_to_core(struct toptree *node, struct toptree *core)

{

	struct toptree *core_node;

	int dist_min = DIST_MAX;

	toptree_for_each(core_node, node, CORE)

		dist_min = min(dist_min, dist_core_to_core(core_node, core));

	return dist_min == DIST_MAX ? DIST_EMPTY : dist_min;

}

/*

 * Unify will delete empty nodes, therefore recreate nodes.

 */

static void toptree_unify_tree(struct toptree *tree)

{

	int nid;

	toptree_unify(tree);

	for (nid = 0; nid < emu_nodes; nid++)

		toptree_get_child(tree, nid);

}

/*

 * Find the best/nearest node for a given core and ensure that no node

 * gets more than "cores_per_node_target + extra" cores.

 */

static struct toptree *node_for_core(struct toptree *numa, struct toptree *core,

				     int extra)

{

	struct toptree *node, *node_best = NULL;

	int dist_cur, dist_best;

	dist_best = DIST_MAX;

	node_best = NULL;

	toptree_for_each(node, numa, NODE) {

		/* Already pinned cores must use their nodes */

		if (core_pinned_to_node_id(core) == node->id) {

			node_best = node;

			break;

		}

		/* Skip nodes that already have enough cores */

		if (cores_pinned(node) >= cores_per_node_target + extra)

			continue;

		dist_cur = dist_node_to_core(node, core);

		if (dist_cur < dist_best) {

			dist_best = dist_cur;

			node_best = node;

		}

	}

	return node_best;

}

/*

 * Find the best node for each core with respect to "extra" core count

 */

static void toptree_to_numa_single(struct toptree *numa, struct toptree *phys,

				   int extra)

{

	struct toptree *node, *core, *tmp;

	toptree_for_each_safe(core, tmp, phys, CORE) {

		node = node_for_core(numa, core, extra);

		if (!node)

			return;

		toptree_move(core, node);

		pin_core_to_node(core->id, node->id);

	}

}

/*

 * Move structures of given level to specified NUMA node

 */

static void move_level_to_numa_node(struct toptree *node, struct toptree *phys,

				    enum toptree_level level, bool perfect)

{

	struct toptree *cur, *tmp;

	int cores_free;

	toptree_for_each_safe(cur, tmp, phys, level) {

		cores_free = cores_per_node_target - toptree_count(node, CORE);

		if (perfect) {

			if (cores_free == toptree_count(cur, CORE))

				toptree_move(cur, node);

		} else {

			if (cores_free >= toptree_count(cur, CORE))

				toptree_move(cur, node);

		}

	}

}

/*

 * Move structures of a given level to NUMA nodes. If "perfect" is specified

 * move only perfectly fitting structures. Otherwise move also smaller

 * than needed structures.

 */

static void move_level_to_numa(struct toptree *numa, struct toptree *phys,

			       enum toptree_level level, bool perfect)

{

	struct toptree *node;

	toptree_for_each(node, numa, NODE)

		move_level_to_numa_node(node, phys, level, perfect);

}

/*

 * For the first run try to move the big structures

 */

static void toptree_to_numa_first(struct toptree *numa, struct toptree *phys)

{

	struct toptree *core;

	/* Always try to move perfectly fitting structures first */

	move_level_to_numa(numa, phys, BOOK, true);

	move_level_to_numa(numa, phys, BOOK, false);

	move_level_to_numa(numa, phys, MC, true);

	move_level_to_numa(numa, phys, MC, false);

	/* Now pin all the moved cores */

	toptree_for_each(core, numa, CORE)

		pin_core_to_node(core->id, core_node(core)->id);

}

/*

 * Allocate new topology and create required nodes

 */

static struct toptree *toptree_new(int id, int nodes)

{

	struct toptree *tree;

	int nid;

	tree = toptree_alloc(TOPOLOGY, id);

	if (!tree)

		goto fail;

	for (nid = 0; nid < nodes; nid++) {

		if (!toptree_get_child(tree, nid))

			goto fail;

	}

	return tree;

fail:

	panic("NUMA emulation could not allocate topology");

}

/*

 * Move cores from physical topology into NUMA target topology

 * and try to keep as much of the physical topology as possible.

 */

static struct toptree *toptree_to_numa(struct toptree *phys)

{

	static int first = 1;

	struct toptree *numa;

	cores_per_node_target = (cores_total + cores_free(phys)) / emu_nodes;

	numa = toptree_new(TOPTREE_ID_NUMA, emu_nodes);

	if (first) {

		toptree_to_numa_first(numa, phys);

		first = 0;

	}

	toptree_to_numa_single(numa, phys, 0);

	toptree_to_numa_single(numa, phys, 1);

	toptree_unify_tree(numa);

	WARN_ON(cpumask_weight(&phys->mask));

	return numa;

}

/*

 * Create a toptree out of the physical topology that we got from the hypervisor

 */

static struct toptree *toptree_from_topology(void)

{

	struct toptree *phys, *node, *book, *mc, *core;

	struct cpu_topology_s390 *top;

	int cpu;

	phys = toptree_new(TOPTREE_ID_PHYS, 1);

	for_each_online_cpu(cpu) {

		top = &per_cpu(cpu_topology, cpu);

		node = toptree_get_child(phys, 0);

		book = toptree_get_child(node, top->book_id);

		mc = toptree_get_child(book, top->socket_id);

		core = toptree_get_child(mc, top->core_id);

		if (!book || !mc || !core)

			panic("NUMA emulation could not allocate memory");

		cpumask_set_cpu(cpu, &core->mask);

		toptree_update_mask(mc);

	}

	return phys;

}

/*

 * Add toptree core to topology and create correct CPU masks

 */

static void topology_add_core(struct toptree *core)

{

	struct cpu_topology_s390 *top;

	int cpu;

	for_each_cpu(cpu, &core->mask) {

		top = &per_cpu(cpu_topology, cpu);

		cpumask_copy(&top->thread_mask, &core->mask);

		cpumask_copy(&top->core_mask, &core_mc(core)->mask);

		cpumask_copy(&top->book_mask, &core_book(core)->mask);

		cpumask_set_cpu(cpu, node_to_cpumask_map[core_node(core)->id]);

		top->node_id = core_node(core)->id;

	}

}

/*

 * Apply toptree to topology and create CPU masks

 */

static void toptree_to_topology(struct toptree *numa)

{

	struct toptree *core;

	int i;

	/* Clear all node masks */

	for (i = 0; i < MAX_NUMNODES; i++)

		cpumask_clear(node_to_cpumask_map[i]);

	/* Rebuild all masks */

	toptree_for_each(core, numa, CORE)

		topology_add_core(core);

}

/*

 * Show the node to core mapping

 */

static void print_node_to_core_map(void)

{

	int nid, cid;

	if (!numa_debug_enabled)

		return;

	printk(KERN_DEBUG "NUMA node to core mapping\n");

	for (nid = 0; nid < emu_nodes; nid++) {

		printk(KERN_DEBUG "  node %3d: ", nid);

		for (cid = 0; cid < ARRAY_SIZE(cores_to_node_id); cid++) {

			if (cores_to_node_id[cid] == nid)

				printk(KERN_CONT "%d ", cid);

		}

		printk(KERN_CONT "\n");

	}

}

/*

 * Transfer physical topology into a NUMA topology and modify CPU masks

 * according to the NUMA topology.

 *

 * This function is called under the CPU hotplug lock.

 */

static void emu_update_cpu_topology(void)

{

	struct toptree *phys, *numa;

	phys = toptree_from_topology();

	numa = toptree_to_numa(phys);

	toptree_free(phys);

	toptree_to_topology(numa);

	toptree_free(numa);

	print_node_to_core_map();

}

/*

 * If emu_size is not set, use CONFIG_EMU_SIZE. Then round to minimum

 * alignment (needed for memory hotplug).

 */

static unsigned long emu_setup_size_adjust(unsigned long size)

{

	size = size ? : CONFIG_EMU_SIZE;

	size = roundup(size, memory_block_size_bytes());

	return size;

}

/*

 * If we have not enough memory for the specified nodes, reduce the node count.

 */

static int emu_setup_nodes_adjust(int nodes)

{

	int nodes_max;

	nodes_max = memblock.memory.total_size / emu_size;

	nodes_max = max(nodes_max, 1);

	if (nodes_max >= nodes)

		return nodes;

	pr_warn("Not enough memory for %d nodes, reducing node count\n", nodes);

	return nodes_max;

}

/*

 * Early emu setup

 */

static void emu_setup(void)

{

	int i;

	emu_size = emu_setup_size_adjust(emu_size);

	emu_nodes = emu_setup_nodes_adjust(emu_nodes);

	for (i = 0; i < ARRAY_SIZE(cores_to_node_id); i++)

		cores_to_node_id[i] = NODE_ID_FREE;

	pr_info("Creating %d nodes with memory stripe size %ld MB\n",

		emu_nodes, emu_size >> 20);

}

/*

 * Return node id for given page number

 */

static int emu_pfn_to_nid(unsigned long pfn)

{

	return (pfn / (emu_size >> PAGE_SHIFT)) % emu_nodes;

}

/*

 * Return stripe size

 */

static unsigned long emu_align(void)

{

	return emu_size;

}

/*

 * Return distance between two nodes

 */

static int emu_distance(int node1, int node2)

{

	return (node1 != node2) * EMU_NODE_DIST;

}

/*

 * Define callbacks for generic s390 NUMA infrastructure

 */

const struct numa_mode numa_mode_emu = {

	.name = "emu",

	.setup = emu_setup,

	.update_cpu_topology = emu_update_cpu_topology,

	.__pfn_to_nid = emu_pfn_to_nid,

	.align = emu_align,

	.distance = emu_distance,

};

/*

 * Kernel parameter: emu_nodes=<n>

 */

static int __init early_parse_emu_nodes(char *p)

{

	int count;

	if (kstrtoint(p, 0, &count) != 0 || count <= 0)

		return 0;

	if (count <= 0)

		return 0;

	emu_nodes = min(count, MAX_NUMNODES);

	return 0;

}

early_param("emu_nodes", early_parse_emu_nodes);

/*

 * Kernel parameter: emu_size=[<n>[k|M|G|T]]

 */

static int __init early_parse_emu_size(char *p)

{

	emu_size = memparse(p, NULL);

	return 0;

}

early_param("emu_size", early_parse_emu_size);

{

	if (strcmp(parm, numa_mode_plain.name) == 0)

		mode = &numa_mode_plain;

#ifdef CONFIG_NUMA_EMU

	if (strcmp(parm, numa_mode_emu.name) == 0)

		mode = &numa_mode_emu;

#endif

	return 0;

}

early_param("numa", parse_numa);