[linux-2.6-block.git] / arch / alpha / mm / numa.c

// SPDX-License-Identifier: GPL-2.0
/*
 *  linux/arch/alpha/mm/numa.c
 *
 *  DISCONTIGMEM NUMA alpha support.
 *
 *  Copyright (C) 2001 Andrea Arcangeli <andrea@suse.de> SuSE
 */

#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/memblock.h>
#include <linux/swap.h>
#include <linux/initrd.h>
#include <linux/pfn.h>
#include <linux/module.h>

#include <asm/hwrpb.h>
#include <asm/pgalloc.h>
#include <asm/sections.h>

pg_data_t node_data[MAX_NUMNODES];
EXPORT_SYMBOL(node_data);

#undef DEBUG_DISCONTIG
#ifdef DEBUG_DISCONTIG
#define DBGDCONT(args...) printk(args)
#else
#define DBGDCONT(args...)
#endif

#define for_each_mem_cluster(memdesc, _cluster, i)		\
	for ((_cluster) = (memdesc)->cluster, (i) = 0;		\
	     (i) < (memdesc)->numclusters; (i)++, (_cluster)++)

static void __init show_mem_layout(void)
{
	struct memclust_struct * cluster;
	struct memdesc_struct * memdesc;
	int i;

	/* Find free clusters, and init and free the bootmem accordingly.  */
	memdesc = (struct memdesc_struct *)
	  (hwrpb->mddt_offset + (unsigned long) hwrpb);

	printk("Raw memory layout:\n");
	for_each_mem_cluster(memdesc, cluster, i) {
		printk(" memcluster %2d, usage %1lx, start %8lu, end %8lu\n",
		       i, cluster->usage, cluster->start_pfn,
		       cluster->start_pfn + cluster->numpages);
	}
}

static void __init
setup_memory_node(int nid, void *kernel_end)
{
	extern unsigned long mem_size_limit;
	struct memclust_struct * cluster;
	struct memdesc_struct * memdesc;
	unsigned long start_kernel_pfn, end_kernel_pfn;
	unsigned long start, end;
	unsigned long node_pfn_start, node_pfn_end;
	unsigned long node_min_pfn, node_max_pfn;
	int i;
	int show_init = 0;

	/* Find the bounds of current node */
	node_pfn_start = (node_mem_start(nid)) >> PAGE_SHIFT;
	node_pfn_end = node_pfn_start + (node_mem_size(nid) >> PAGE_SHIFT);
	
	/* Find free clusters, and init and free the bootmem accordingly.  */
	memdesc = (struct memdesc_struct *)
	  (hwrpb->mddt_offset + (unsigned long) hwrpb);

	/* find the bounds of this node (node_min_pfn/node_max_pfn) */
	node_min_pfn = ~0UL;
	node_max_pfn = 0UL;
	for_each_mem_cluster(memdesc, cluster, i) {
		/* Bit 0 is console/PALcode reserved.  Bit 1 is
		   non-volatile memory -- we might want to mark
		   this for later.  */
		if (cluster->usage & 3)
			continue;

		start = cluster->start_pfn;
		end = start + cluster->numpages;

		if (start >= node_pfn_end || end <= node_pfn_start)
			continue;

		if (!show_init) {
			show_init = 1;
			printk("Initializing bootmem allocator on Node ID %d\n", nid);
		}
		printk(" memcluster %2d, usage %1lx, start %8lu, end %8lu\n",
		       i, cluster->usage, cluster->start_pfn,
		       cluster->start_pfn + cluster->numpages);

		if (start < node_pfn_start)
			start = node_pfn_start;
		if (end > node_pfn_end)
			end = node_pfn_end;

		if (start < node_min_pfn)
			node_min_pfn = start;
		if (end > node_max_pfn)
			node_max_pfn = end;
	}

	if (mem_size_limit && node_max_pfn > mem_size_limit) {
		static int msg_shown = 0;
		if (!msg_shown) {
			msg_shown = 1;
			printk("setup: forcing memory size to %ldK (from %ldK).\n",
			       mem_size_limit << (PAGE_SHIFT - 10),
			       node_max_pfn    << (PAGE_SHIFT - 10));
		}
		node_max_pfn = mem_size_limit;
	}

	if (node_min_pfn >= node_max_pfn)
		return;

	/* Update global {min,max}_low_pfn from node information. */
	if (node_min_pfn < min_low_pfn)
		min_low_pfn = node_min_pfn;
	if (node_max_pfn > max_low_pfn)
		max_pfn = max_low_pfn = node_max_pfn;

#if 0 /* we'll try this one again in a little while */
	/* Cute trick to make sure our local node data is on local memory */
	node_data[nid] = (pg_data_t *)(__va(node_min_pfn << PAGE_SHIFT));
#endif
	printk(" Detected node memory:   start %8lu, end %8lu\n",
	       node_min_pfn, node_max_pfn);

	DBGDCONT(" DISCONTIG: node_data[%d]   is at 0x%p\n", nid, NODE_DATA(nid));

	/* Find the bounds of kernel memory.  */
	start_kernel_pfn = PFN_DOWN(KERNEL_START_PHYS);
	end_kernel_pfn = PFN_UP(virt_to_phys(kernel_end));

	if (!nid && (node_max_pfn < end_kernel_pfn || node_min_pfn > start_kernel_pfn))
		panic("kernel loaded out of ram");

	/* Zone start phys-addr must be 2^(MAX_ORDER-1) aligned.
	   Note that we round this down, not up - node memory
	   has much larger alignment than 8Mb, so it's safe. */
	node_min_pfn &= ~((1UL << (MAX_ORDER-1))-1);

	memblock_add(PFN_PHYS(node_min_pfn),
		     (node_max_pfn - node_min_pfn) << PAGE_SHIFT);

	NODE_DATA(nid)->node_start_pfn = node_min_pfn;
	NODE_DATA(nid)->node_present_pages = node_max_pfn - node_min_pfn;

	node_set_online(nid);
}

void __init
setup_memory(void *kernel_end)
{
	unsigned long kernel_size;
	int nid;

	show_mem_layout();

	nodes_clear(node_online_map);

	min_low_pfn = ~0UL;
	max_low_pfn = 0UL;
	for (nid = 0; nid < MAX_NUMNODES; nid++)
		setup_memory_node(nid, kernel_end);

	kernel_size = virt_to_phys(kernel_end) - KERNEL_START_PHYS;
	memblock_reserve(KERNEL_START_PHYS, kernel_size);

#ifdef CONFIG_BLK_DEV_INITRD
	initrd_start = INITRD_START;
	if (initrd_start) {
		extern void *move_initrd(unsigned long);

		initrd_end = initrd_start+INITRD_SIZE;
		printk("Initial ramdisk at: 0x%p (%lu bytes)\n",
		       (void *) initrd_start, INITRD_SIZE);

		if ((void *)initrd_end > phys_to_virt(PFN_PHYS(max_low_pfn))) {
			if (!move_initrd(PFN_PHYS(max_low_pfn)))
				printk("initrd extends beyond end of memory "
				       "(0x%08lx > 0x%p)\ndisabling initrd\n",
				       initrd_end,
				       phys_to_virt(PFN_PHYS(max_low_pfn)));
		} else {
			nid = kvaddr_to_nid(initrd_start);
			memblock_reserve(virt_to_phys((void *)initrd_start),
					 INITRD_SIZE);
		}
	}
#endif /* CONFIG_BLK_DEV_INITRD */
}

void __init paging_init(void)
{
	unsigned int    nid;
	unsigned long   zones_size[MAX_NR_ZONES] = {0, };
	unsigned long	dma_local_pfn;

	/*
	 * The old global MAX_DMA_ADDRESS per-arch API doesn't fit
	 * in the NUMA model, for now we convert it to a pfn and
	 * we interpret this pfn as a local per-node information.
	 * This issue isn't very important since none of these machines
	 * have legacy ISA slots anyways.
	 */
	dma_local_pfn = virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT;

	for_each_online_node(nid) {
		unsigned long start_pfn = NODE_DATA(nid)->node_start_pfn;
		unsigned long end_pfn = start_pfn + NODE_DATA(nid)->node_present_pages;

		if (dma_local_pfn >= end_pfn - start_pfn)
			zones_size[ZONE_DMA] = end_pfn - start_pfn;
		else {
			zones_size[ZONE_DMA] = dma_local_pfn;
			zones_size[ZONE_NORMAL] = (end_pfn - start_pfn) - dma_local_pfn;
		}
		node_set_state(nid, N_NORMAL_MEMORY);
		free_area_init_node(nid, zones_size, start_pfn, NULL);
	}

	/* Initialize the kernel's ZERO_PGE. */
	memset((void *)ZERO_PGE, 0, PAGE_SIZE);
}
Commit	Line	Data
b2441318	1	// SPDX-License-Identifier: GPL-2.0
1da177e4 LT	2	/*
	3	* linux/arch/alpha/mm/numa.c
	4	*
	5	* DISCONTIGMEM NUMA alpha support.
	6	*
	7	* Copyright (C) 2001 Andrea Arcangeli <andrea@suse.de> SuSE
	8	*/
	9
1da177e4 LT	10	#include <linux/types.h>
	11	#include <linux/kernel.h>
	12	#include <linux/mm.h>
6471f52a	13	#include <linux/memblock.h>
1da177e4 LT	14	#include <linux/swap.h>
1da177e4 LT	15	#include <linux/initrd.h>
22a9835c	16	#include <linux/pfn.h>
cff52daf	17	#include <linux/module.h>
1da177e4 LT	18
	19	#include <asm/hwrpb.h>
	20	#include <asm/pgalloc.h>
f3beeb4a	21	#include <asm/sections.h>
1da177e4 LT	22
1da177e4 LT	23	pg_data_t node_data[MAX_NUMNODES];
cff52daf	24	EXPORT_SYMBOL(node_data);
1da177e4 LT	25
	26	#undef DEBUG_DISCONTIG
	27	#ifdef DEBUG_DISCONTIG
	28	#define DBGDCONT(args...) printk(args)
	29	#else
	30	#define DBGDCONT(args...)
	31	#endif
	32
fb26b3e6 RK	33	#define for_each_mem_cluster(memdesc, _cluster, i) \
	34	for ((_cluster) = (memdesc)->cluster, (i) = 0; \
	35	(i) < (memdesc)->numclusters; (i)++, (_cluster)++)
1da177e4 LT	36
	37	static void __init show_mem_layout(void)
	38	{
	39	struct memclust_struct * cluster;
	40	struct memdesc_struct * memdesc;
	41	int i;
	42
	43	/* Find free clusters, and init and free the bootmem accordingly. */
	44	memdesc = (struct memdesc_struct *)
	45	(hwrpb->mddt_offset + (unsigned long) hwrpb);
	46
	47	printk("Raw memory layout:\n");
	48	for_each_mem_cluster(memdesc, cluster, i) {
	49	printk(" memcluster %2d, usage %1lx, start %8lu, end %8lu\n",
	50	i, cluster->usage, cluster->start_pfn,
	51	cluster->start_pfn + cluster->numpages);
	52	}
	53	}
	54
	55	static void __init
	56	setup_memory_node(int nid, void *kernel_end)
	57	{
	58	extern unsigned long mem_size_limit;
	59	struct memclust_struct * cluster;
	60	struct memdesc_struct * memdesc;
	61	unsigned long start_kernel_pfn, end_kernel_pfn;
1da177e4 LT	62	unsigned long start, end;
	63	unsigned long node_pfn_start, node_pfn_end;
	64	unsigned long node_min_pfn, node_max_pfn;
	65	int i;
1da177e4 LT	66	int show_init = 0;
	67
	68	/* Find the bounds of current node */
	69	node_pfn_start = (node_mem_start(nid)) >> PAGE_SHIFT;
	70	node_pfn_end = node_pfn_start + (node_mem_size(nid) >> PAGE_SHIFT);
	71
	72	/* Find free clusters, and init and free the bootmem accordingly. */
	73	memdesc = (struct memdesc_struct *)
	74	(hwrpb->mddt_offset + (unsigned long) hwrpb);
	75
	76	/* find the bounds of this node (node_min_pfn/node_max_pfn) */
	77	node_min_pfn = ~0UL;
	78	node_max_pfn = 0UL;
	79	for_each_mem_cluster(memdesc, cluster, i) {
	80	/* Bit 0 is console/PALcode reserved. Bit 1 is
	81	non-volatile memory -- we might want to mark
	82	this for later. */
	83	if (cluster->usage & 3)
	84	continue;
	85
	86	start = cluster->start_pfn;
	87	end = start + cluster->numpages;
	88
	89	if (start >= node_pfn_end \|\| end <= node_pfn_start)
	90	continue;
	91
	92	if (!show_init) {
	93	show_init = 1;
	94	printk("Initializing bootmem allocator on Node ID %d\n", nid);
	95	}
	96	printk(" memcluster %2d, usage %1lx, start %8lu, end %8lu\n",
	97	i, cluster->usage, cluster->start_pfn,
	98	cluster->start_pfn + cluster->numpages);
	99
	100	if (start < node_pfn_start)
	101	start = node_pfn_start;
	102	if (end > node_pfn_end)
	103	end = node_pfn_end;
	104
	105	if (start < node_min_pfn)
	106	node_min_pfn = start;
	107	if (end > node_max_pfn)
	108	node_max_pfn = end;
	109	}
	110
	111	if (mem_size_limit && node_max_pfn > mem_size_limit) {
	112	static int msg_shown = 0;
	113	if (!msg_shown) {
	114	msg_shown = 1;
	115	printk("setup: forcing memory size to %ldK (from %ldK).\n",
	116	mem_size_limit << (PAGE_SHIFT - 10),
	117	node_max_pfn << (PAGE_SHIFT - 10));
	118	}
	119	node_max_pfn = mem_size_limit;
	120	}
	121
	122	if (node_min_pfn >= node_max_pfn)
	123	return;
	124
	125	/* Update global {min,max}_low_pfn from node information. */
	126	if (node_min_pfn < min_low_pfn)
	127	min_low_pfn = node_min_pfn;
	128	if (node_max_pfn > max_low_pfn)
	129	max_pfn = max_low_pfn = node_max_pfn;
130
1da177e4 LT	131	#if 0 /* we'll try this one again in a little while */
	132	/* Cute trick to make sure our local node data is on local memory */
	133	node_data[nid] = (pg_data_t *)(__va(node_min_pfn << PAGE_SHIFT));
	134	#endif
1da177e4 LT	135	printk(" Detected node memory: start %8lu, end %8lu\n",
	136	node_min_pfn, node_max_pfn);
	137
	138	DBGDCONT(" DISCONTIG: node_data[%d] is at 0x%p\n", nid, NODE_DATA(nid));
1da177e4 LT	139
	140	/* Find the bounds of kernel memory. */
	141	start_kernel_pfn = PFN_DOWN(KERNEL_START_PHYS);
	142	end_kernel_pfn = PFN_UP(virt_to_phys(kernel_end));
1da177e4 LT	143
	144	if (!nid && (node_max_pfn < end_kernel_pfn \|\| node_min_pfn > start_kernel_pfn))
	145	panic("kernel loaded out of ram");
	146
	147	/* Zone start phys-addr must be 2^(MAX_ORDER-1) aligned.
	148	Note that we round this down, not up - node memory
	149	has much larger alignment than 8Mb, so it's safe. */
	150	node_min_pfn &= ~((1UL << (MAX_ORDER-1))-1);
	151
6471f52a MR	152	memblock_add(PFN_PHYS(node_min_pfn),
6471f52a MR	153	(node_max_pfn - node_min_pfn) << PAGE_SHIFT);
1da177e4	154
6471f52a MR	155	NODE_DATA(nid)->node_start_pfn = node_min_pfn;
6471f52a MR	156	NODE_DATA(nid)->node_present_pages = node_max_pfn - node_min_pfn;
1da177e4 LT	157
	158	node_set_online(nid);
	159	}
	160
	161	void __init
	162	setup_memory(void *kernel_end)
	163	{
6471f52a	164	unsigned long kernel_size;
1da177e4 LT	165	int nid;
	166
	167	show_mem_layout();
	168
	169	nodes_clear(node_online_map);
	170
	171	min_low_pfn = ~0UL;
	172	max_low_pfn = 0UL;
	173	for (nid = 0; nid < MAX_NUMNODES; nid++)
	174	setup_memory_node(nid, kernel_end);
	175
6471f52a MR	176	kernel_size = virt_to_phys(kernel_end) - KERNEL_START_PHYS;
	177	memblock_reserve(KERNEL_START_PHYS, kernel_size);
	178
1da177e4 LT	179	#ifdef CONFIG_BLK_DEV_INITRD
	180	initrd_start = INITRD_START;
	181	if (initrd_start) {
	182	extern void *move_initrd(unsigned long);
	183
	184	initrd_end = initrd_start+INITRD_SIZE;
	185	printk("Initial ramdisk at: 0x%p (%lu bytes)\n",
	186	(void *) initrd_start, INITRD_SIZE);
	187
	188	if ((void *)initrd_end > phys_to_virt(PFN_PHYS(max_low_pfn))) {
	189	if (!move_initrd(PFN_PHYS(max_low_pfn)))
	190	printk("initrd extends beyond end of memory "
	191	"(0x%08lx > 0x%p)\ndisabling initrd\n",
	192	initrd_end,
	193	phys_to_virt(PFN_PHYS(max_low_pfn)));
	194	} else {
	195	nid = kvaddr_to_nid(initrd_start);
6471f52a MR	196	memblock_reserve(virt_to_phys((void *)initrd_start),
6471f52a MR	197	INITRD_SIZE);
1da177e4 LT	198	}
	199	}
	200	#endif /* CONFIG_BLK_DEV_INITRD */
	201	}
	202
	203	void __init paging_init(void)
	204	{
	205	unsigned int nid;
	206	unsigned long zones_size[MAX_NR_ZONES] = {0, };
	207	unsigned long dma_local_pfn;
	208
	209	/*
	210	* The old global MAX_DMA_ADDRESS per-arch API doesn't fit
	211	* in the NUMA model, for now we convert it to a pfn and
	212	* we interpret this pfn as a local per-node information.
	213	* This issue isn't very important since none of these machines
	214	* have legacy ISA slots anyways.
	215	*/
	216	dma_local_pfn = virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT;
	217
	218	for_each_online_node(nid) {
6471f52a MR	219	unsigned long start_pfn = NODE_DATA(nid)->node_start_pfn;
6471f52a MR	220	unsigned long end_pfn = start_pfn + NODE_DATA(nid)->node_present_pages;
1da177e4 LT	221
	222	if (dma_local_pfn >= end_pfn - start_pfn)
	223	zones_size[ZONE_DMA] = end_pfn - start_pfn;
	224	else {
	225	zones_size[ZONE_DMA] = dma_local_pfn;
	226	zones_size[ZONE_NORMAL] = (end_pfn - start_pfn) - dma_local_pfn;
	227	}
ad8b4b28	228	node_set_state(nid, N_NORMAL_MEMORY);
9109fb7b	229	free_area_init_node(nid, zones_size, start_pfn, NULL);
1da177e4 LT	230	}
	231
	232	/* Initialize the kernel's ZERO_PGE. */
	233	memset((void *)ZERO_PGE, 0, PAGE_SIZE);
	234	}