Commit | Line | Data |
---|---|---|
3aa88cdf | 1 | /* |
eec1d4fa | 2 | * AMD NUMA support. |
1da177e4 | 3 | * Discover the memory map and associated nodes. |
3aa88cdf | 4 | * |
eec1d4fa | 5 | * This version reads it directly from the AMD northbridge. |
3aa88cdf | 6 | * |
1da177e4 LT |
7 | * Copyright 2002,2003 Andi Kleen, SuSE Labs. |
8 | */ | |
9 | #include <linux/kernel.h> | |
10 | #include <linux/init.h> | |
11 | #include <linux/string.h> | |
1da177e4 | 12 | #include <linux/nodemask.h> |
a9ce6bc1 | 13 | #include <linux/memblock.h> |
2706a0bf | 14 | #include <linux/bootmem.h> |
a9ce6bc1 | 15 | |
1da177e4 LT |
16 | #include <asm/io.h> |
17 | #include <linux/pci_ids.h> | |
cbf9bd60 | 18 | #include <linux/acpi.h> |
1da177e4 LT |
19 | #include <asm/types.h> |
20 | #include <asm/mmzone.h> | |
21 | #include <asm/proto.h> | |
22 | #include <asm/e820.h> | |
23 | #include <asm/pci-direct.h> | |
24 | #include <asm/numa.h> | |
cbf9bd60 YL |
25 | #include <asm/mpspec.h> |
26 | #include <asm/apic.h> | |
23ac4ae8 | 27 | #include <asm/amd_nb.h> |
1da177e4 | 28 | |
f51bf307 | 29 | static unsigned char __initdata nodeids[8]; |
8ee2debc | 30 | |
1da177e4 LT |
31 | static __init int find_northbridge(void) |
32 | { | |
3aa88cdf | 33 | int num; |
1da177e4 | 34 | |
3aa88cdf | 35 | for (num = 0; num < 32; num++) { |
1da177e4 | 36 | u32 header; |
3aa88cdf CM |
37 | |
38 | header = read_pci_config(0, num, 0, 0x00); | |
bb4a1d64 JD |
39 | if (header != (PCI_VENDOR_ID_AMD | (0x1100<<16)) && |
40 | header != (PCI_VENDOR_ID_AMD | (0x1200<<16)) && | |
41 | header != (PCI_VENDOR_ID_AMD | (0x1300<<16))) | |
3aa88cdf | 42 | continue; |
1da177e4 | 43 | |
3aa88cdf | 44 | header = read_pci_config(0, num, 1, 0x00); |
bb4a1d64 JD |
45 | if (header != (PCI_VENDOR_ID_AMD | (0x1101<<16)) && |
46 | header != (PCI_VENDOR_ID_AMD | (0x1201<<16)) && | |
47 | header != (PCI_VENDOR_ID_AMD | (0x1301<<16))) | |
3aa88cdf CM |
48 | continue; |
49 | return num; | |
50 | } | |
1da177e4 | 51 | |
940fed2e | 52 | return -ENOENT; |
1da177e4 LT |
53 | } |
54 | ||
cbf9bd60 YL |
55 | static __init void early_get_boot_cpu_id(void) |
56 | { | |
57 | /* | |
f6e9456c | 58 | * need to get the APIC ID of the BSP so can use that to |
eec1d4fa | 59 | * create apicid_to_node in amd_scan_nodes() |
cbf9bd60 | 60 | */ |
a4caa18e | 61 | #ifdef CONFIG_X86_MPPARSE |
cbf9bd60 YL |
62 | /* |
63 | * get boot-time SMP configuration: | |
64 | */ | |
65 | if (smp_found_config) | |
66 | early_get_smp_config(); | |
a4caa18e | 67 | #endif |
8ee2debc DR |
68 | } |
69 | ||
940fed2e | 70 | int __init amd_numa_init(void) |
8ee2debc | 71 | { |
2706a0bf TH |
72 | u64 start = PFN_PHYS(0); |
73 | u64 end = PFN_PHYS(max_pfn); | |
8ee2debc | 74 | unsigned numnodes; |
2706a0bf | 75 | u64 prevbase; |
45fe6c78 | 76 | int i, j, nb; |
d34c0895 | 77 | u32 nodeid, reg; |
45fe6c78 | 78 | unsigned int bits, cores, apicid_base; |
1da177e4 | 79 | |
0637a70a | 80 | if (!early_pci_allowed()) |
940fed2e | 81 | return -EINVAL; |
0637a70a | 82 | |
3aa88cdf CM |
83 | nb = find_northbridge(); |
84 | if (nb < 0) | |
1da177e4 LT |
85 | return nb; |
86 | ||
1af5ba51 | 87 | pr_info("Scanning NUMA topology in Northbridge %d\n", nb); |
1da177e4 | 88 | |
3aa88cdf | 89 | reg = read_pci_config(0, nb, 0, 0x60); |
1da177e4 | 90 | numnodes = ((reg >> 4) & 0xF) + 1; |
3bea9c97 | 91 | if (numnodes <= 1) |
940fed2e | 92 | return -ENOENT; |
1da177e4 | 93 | |
8ee2debc | 94 | pr_info("Number of physical nodes %d\n", numnodes); |
1da177e4 | 95 | |
1da177e4 | 96 | prevbase = 0; |
3aa88cdf | 97 | for (i = 0; i < 8; i++) { |
2706a0bf | 98 | u64 base, limit; |
3aa88cdf | 99 | |
1da177e4 LT |
100 | base = read_pci_config(0, nb, 1, 0x40 + i*8); |
101 | limit = read_pci_config(0, nb, 1, 0x44 + i*8); | |
102 | ||
f51bf307 | 103 | nodeids[i] = nodeid = limit & 7; |
3aa88cdf | 104 | if ((base & 3) == 0) { |
1da177e4 | 105 | if (i < numnodes) |
1af5ba51 | 106 | pr_info("Skipping disabled node %d\n", i); |
1da177e4 | 107 | continue; |
3aa88cdf | 108 | } |
1da177e4 | 109 | if (nodeid >= numnodes) { |
2706a0bf | 110 | pr_info("Ignoring excess node %d (%Lx:%Lx)\n", nodeid, |
1af5ba51 | 111 | base, limit); |
1da177e4 | 112 | continue; |
3aa88cdf | 113 | } |
1da177e4 | 114 | |
3aa88cdf | 115 | if (!limit) { |
2706a0bf | 116 | pr_info("Skipping node entry %d (base %Lx)\n", |
1af5ba51 | 117 | i, base); |
1da177e4 LT |
118 | continue; |
119 | } | |
120 | if ((base >> 8) & 3 || (limit >> 8) & 3) { | |
2706a0bf | 121 | pr_err("Node %d using interleaving mode %Lx/%Lx\n", |
1af5ba51 | 122 | nodeid, (base >> 8) & 3, (limit >> 8) & 3); |
940fed2e | 123 | return -EINVAL; |
3aa88cdf | 124 | } |
4697bdcc | 125 | if (node_isset(nodeid, numa_nodes_parsed)) { |
1af5ba51 DR |
126 | pr_info("Node %d already present, skipping\n", |
127 | nodeid); | |
1da177e4 LT |
128 | continue; |
129 | } | |
130 | ||
3aa88cdf | 131 | limit >>= 16; |
ffd10a2b | 132 | limit++; |
7e9a2f0a | 133 | limit <<= 24; |
1da177e4 | 134 | |
8ee2debc DR |
135 | if (limit > end) |
136 | limit = end; | |
1da177e4 | 137 | if (limit <= base) |
3aa88cdf CM |
138 | continue; |
139 | ||
1da177e4 | 140 | base >>= 16; |
3aa88cdf CM |
141 | base <<= 24; |
142 | ||
143 | if (base < start) | |
144 | base = start; | |
145 | if (limit > end) | |
146 | limit = end; | |
147 | if (limit == base) { | |
1af5ba51 | 148 | pr_err("Empty node %d\n", nodeid); |
3aa88cdf | 149 | continue; |
1da177e4 | 150 | } |
3aa88cdf | 151 | if (limit < base) { |
2706a0bf | 152 | pr_err("Node %d bogus settings %Lx-%Lx.\n", |
3aa88cdf | 153 | nodeid, base, limit); |
1da177e4 | 154 | continue; |
3aa88cdf CM |
155 | } |
156 | ||
1da177e4 | 157 | /* Could sort here, but pun for now. Should not happen anyroads. */ |
3aa88cdf | 158 | if (prevbase > base) { |
2706a0bf | 159 | pr_err("Node map not sorted %Lx,%Lx\n", |
3aa88cdf | 160 | prevbase, base); |
940fed2e | 161 | return -EINVAL; |
1da177e4 | 162 | } |
3aa88cdf | 163 | |
2706a0bf | 164 | pr_info("Node %d MemBase %016Lx Limit %016Lx\n", |
1af5ba51 | 165 | nodeid, base, limit); |
3aa88cdf | 166 | |
1da177e4 | 167 | prevbase = base; |
91556237 | 168 | numa_add_memblk(nodeid, base, limit); |
92d4a437 | 169 | node_set(nodeid, numa_nodes_parsed); |
3aa88cdf | 170 | } |
1da177e4 | 171 | |
4697bdcc | 172 | if (!nodes_weight(numa_nodes_parsed)) |
940fed2e | 173 | return -ENOENT; |
45fe6c78 TH |
174 | |
175 | /* | |
176 | * We seem to have valid NUMA configuration. Map apicids to nodes | |
177 | * using the coreid bits from early_identify_cpu. | |
178 | */ | |
179 | bits = boot_cpu_data.x86_coreid_bits; | |
180 | cores = 1 << bits; | |
181 | apicid_base = 0; | |
182 | ||
183 | /* get the APIC ID of the BSP early for systems with apicid lifting */ | |
184 | early_get_boot_cpu_id(); | |
185 | if (boot_cpu_physical_apicid > 0) { | |
186 | pr_info("BSP APIC ID: %02x\n", boot_cpu_physical_apicid); | |
187 | apicid_base = boot_cpu_physical_apicid; | |
188 | } | |
189 | ||
92d4a437 | 190 | for_each_node_mask(i, numa_nodes_parsed) |
45fe6c78 TH |
191 | for (j = apicid_base; j < cores + apicid_base; j++) |
192 | set_apicid_to_node((i << bits) + j, i); | |
193 | ||
8ee2debc DR |
194 | return 0; |
195 | } |