1 // SPDX-License-Identifier: GPL-2.0
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
10 #include <linux/types.h>
11 #include <linux/kernel.h>
12 #include <linux/mm.h>
13 #include <linux/memblock.h>
14 #include <linux/swap.h>
15 #include <linux/initrd.h>
16 #include <linux/pfn.h>
17 #include <linux/module.h>
18
19 #include <asm/hwrpb.h>
20 #include <asm/pgalloc.h>
21 #include <asm/sections.h>
22
23 pg_data_t node_data[MAX_NUMNODES];
24 EXPORT_SYMBOL(node_data);
25
26 #undef DEBUG_DISCONTIG
27 #ifdef DEBUG_DISCONTIG
28 #define DBGDCONT(args...) printk(args)
29 #else
30 #define DBGDCONT(args...)
31 #endif
32
33 #define for_each_mem_cluster(memdesc, _cluster, i) \
34 for ((_cluster) = (memdesc)->cluster, (i) = 0; \
35 (i) < (memdesc)->numclusters; (i)++, (_cluster)++)
36
show_mem_layout(void)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
setup_memory_node(int nid,void * kernel_end)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;
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;
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
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
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));
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));
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 memblock_add(PFN_PHYS(node_min_pfn),
148 (node_max_pfn - node_min_pfn) << PAGE_SHIFT);
149
150 /* Zone start phys-addr must be 2^(MAX_ORDER-1) aligned.
151 Note that we round this down, not up - node memory
152 has much larger alignment than 8Mb, so it's safe. */
153 node_min_pfn &= ~((1UL << (MAX_ORDER-1))-1);
154
155 NODE_DATA(nid)->node_start_pfn = node_min_pfn;
156 NODE_DATA(nid)->node_present_pages = node_max_pfn - node_min_pfn;
157
158 node_set_online(nid);
159 }
160
161 void __init
setup_memory(void * kernel_end)162 setup_memory(void *kernel_end)
163 {
164 unsigned long kernel_size;
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
176 kernel_size = virt_to_phys(kernel_end) - KERNEL_START_PHYS;
177 memblock_reserve(KERNEL_START_PHYS, kernel_size);
178
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);
196 memblock_reserve(virt_to_phys((void *)initrd_start),
197 INITRD_SIZE);
198 }
199 }
200 #endif /* CONFIG_BLK_DEV_INITRD */
201 }
202
paging_init(void)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) {
219 unsigned long start_pfn = NODE_DATA(nid)->node_start_pfn;
220 unsigned long end_pfn = start_pfn + NODE_DATA(nid)->node_present_pages;
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 }
228 node_set_state(nid, N_NORMAL_MEMORY);
229 free_area_init_node(nid, zones_size, start_pfn, NULL);
230 }
231
232 /* Initialize the kernel's ZERO_PGE. */
233 memset((void *)ZERO_PGE, 0, PAGE_SIZE);
234 }
235