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