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1#include <linux/init.h>
2#include <linux/pci.h>
3#include <linux/topology.h>
4#include <linux/cpu.h>
5#include <linux/range.h>
6
7#include <asm/amd_nb.h>
8#include <asm/pci_x86.h>
9
10#include <asm/pci-direct.h>
11
12#include "bus_numa.h"
13
14/*
15 * This discovers the pcibus <-> node mapping on AMD K8.
16 * also get peer root bus resource for io,mmio
17 */
18
19struct pci_hostbridge_probe {
20 u32 bus;
21 u32 slot;
22 u32 vendor;
23 u32 device;
24};
25
26static struct pci_hostbridge_probe pci_probes[] __initdata = {
27 { 0, 0x18, PCI_VENDOR_ID_AMD, 0x1100 },
28 { 0, 0x18, PCI_VENDOR_ID_AMD, 0x1200 },
29 { 0xff, 0, PCI_VENDOR_ID_AMD, 0x1200 },
30 { 0, 0x18, PCI_VENDOR_ID_AMD, 0x1300 },
31};
32
33#define RANGE_NUM 16
34
35static struct pci_root_info __init *find_pci_root_info(int node, int link)
36{
37 struct pci_root_info *info;
38
39 /* find the position */
40 list_for_each_entry(info, &pci_root_infos, list)
41 if (info->node == node && info->link == link)
42 return info;
43
44 return NULL;
45}
46
47/**
48 * early_fill_mp_bus_to_node()
49 * called before pcibios_scan_root and pci_scan_bus
50 * fills the mp_bus_to_cpumask array based according to the LDT Bus Number
51 * Registers found in the K8 northbridge
52 */
53static int __init early_fill_mp_bus_info(void)
54{
55 int i;
56 unsigned bus;
57 unsigned slot;
58 int node;
59 int link;
60 int def_node;
61 int def_link;
62 struct pci_root_info *info;
63 u32 reg;
64 u64 start;
65 u64 end;
66 struct range range[RANGE_NUM];
67 u64 val;
68 u32 address;
69 bool found;
70 struct resource fam10h_mmconf_res, *fam10h_mmconf;
71 u64 fam10h_mmconf_start;
72 u64 fam10h_mmconf_end;
73
74 if (!early_pci_allowed())
75 return -1;
76
77 found = false;
78 for (i = 0; i < ARRAY_SIZE(pci_probes); i++) {
79 u32 id;
80 u16 device;
81 u16 vendor;
82
83 bus = pci_probes[i].bus;
84 slot = pci_probes[i].slot;
85 id = read_pci_config(bus, slot, 0, PCI_VENDOR_ID);
86
87 vendor = id & 0xffff;
88 device = (id>>16) & 0xffff;
89 if (pci_probes[i].vendor == vendor &&
90 pci_probes[i].device == device) {
91 found = true;
92 break;
93 }
94 }
95
96 if (!found)
97 return 0;
98
99 for (i = 0; i < 4; i++) {
100 int min_bus;
101 int max_bus;
102 reg = read_pci_config(bus, slot, 1, 0xe0 + (i << 2));
103
104 /* Check if that register is enabled for bus range */
105 if ((reg & 7) != 3)
106 continue;
107
108 min_bus = (reg >> 16) & 0xff;
109 max_bus = (reg >> 24) & 0xff;
110 node = (reg >> 4) & 0x07;
111 link = (reg >> 8) & 0x03;
112
113 info = alloc_pci_root_info(min_bus, max_bus, node, link);
114 }
115
116 /* get the default node and link for left over res */
117 reg = read_pci_config(bus, slot, 0, 0x60);
118 def_node = (reg >> 8) & 0x07;
119 reg = read_pci_config(bus, slot, 0, 0x64);
120 def_link = (reg >> 8) & 0x03;
121
122 memset(range, 0, sizeof(range));
123 add_range(range, RANGE_NUM, 0, 0, 0xffff + 1);
124 /* io port resource */
125 for (i = 0; i < 4; i++) {
126 reg = read_pci_config(bus, slot, 1, 0xc0 + (i << 3));
127 if (!(reg & 3))
128 continue;
129
130 start = reg & 0xfff000;
131 reg = read_pci_config(bus, slot, 1, 0xc4 + (i << 3));
132 node = reg & 0x07;
133 link = (reg >> 4) & 0x03;
134 end = (reg & 0xfff000) | 0xfff;
135
136 info = find_pci_root_info(node, link);
137 if (!info)
138 continue; /* not found */
139
140 printk(KERN_DEBUG "node %d link %d: io port [%llx, %llx]\n",
141 node, link, start, end);
142
143 /* kernel only handle 16 bit only */
144 if (end > 0xffff)
145 end = 0xffff;
146 update_res(info, start, end, IORESOURCE_IO, 1);
147 subtract_range(range, RANGE_NUM, start, end + 1);
148 }
149 /* add left over io port range to def node/link, [0, 0xffff] */
150 /* find the position */
151 info = find_pci_root_info(def_node, def_link);
152 if (info) {
153 for (i = 0; i < RANGE_NUM; i++) {
154 if (!range[i].end)
155 continue;
156
157 update_res(info, range[i].start, range[i].end - 1,
158 IORESOURCE_IO, 1);
159 }
160 }
161
162 memset(range, 0, sizeof(range));
163 /* 0xfd00000000-0xffffffffff for HT */
164 end = cap_resource((0xfdULL<<32) - 1);
165 end++;
166 add_range(range, RANGE_NUM, 0, 0, end);
167
168 /* need to take out [0, TOM) for RAM*/
169 address = MSR_K8_TOP_MEM1;
170 rdmsrl(address, val);
171 end = (val & 0xffffff800000ULL);
172 printk(KERN_INFO "TOM: %016llx aka %lldM\n", end, end>>20);
173 if (end < (1ULL<<32))
174 subtract_range(range, RANGE_NUM, 0, end);
175
176 /* get mmconfig */
177 fam10h_mmconf = amd_get_mmconfig_range(&fam10h_mmconf_res);
178 /* need to take out mmconf range */
179 if (fam10h_mmconf) {
180 printk(KERN_DEBUG "Fam 10h mmconf %pR\n", fam10h_mmconf);
181 fam10h_mmconf_start = fam10h_mmconf->start;
182 fam10h_mmconf_end = fam10h_mmconf->end;
183 subtract_range(range, RANGE_NUM, fam10h_mmconf_start,
184 fam10h_mmconf_end + 1);
185 } else {
186 fam10h_mmconf_start = 0;
187 fam10h_mmconf_end = 0;
188 }
189
190 /* mmio resource */
191 for (i = 0; i < 8; i++) {
192 reg = read_pci_config(bus, slot, 1, 0x80 + (i << 3));
193 if (!(reg & 3))
194 continue;
195
196 start = reg & 0xffffff00; /* 39:16 on 31:8*/
197 start <<= 8;
198 reg = read_pci_config(bus, slot, 1, 0x84 + (i << 3));
199 node = reg & 0x07;
200 link = (reg >> 4) & 0x03;
201 end = (reg & 0xffffff00);
202 end <<= 8;
203 end |= 0xffff;
204
205 info = find_pci_root_info(node, link);
206
207 if (!info)
208 continue;
209
210 printk(KERN_DEBUG "node %d link %d: mmio [%llx, %llx]",
211 node, link, start, end);
212 /*
213 * some sick allocation would have range overlap with fam10h
214 * mmconf range, so need to update start and end.
215 */
216 if (fam10h_mmconf_end) {
217 int changed = 0;
218 u64 endx = 0;
219 if (start >= fam10h_mmconf_start &&
220 start <= fam10h_mmconf_end) {
221 start = fam10h_mmconf_end + 1;
222 changed = 1;
223 }
224
225 if (end >= fam10h_mmconf_start &&
226 end <= fam10h_mmconf_end) {
227 end = fam10h_mmconf_start - 1;
228 changed = 1;
229 }
230
231 if (start < fam10h_mmconf_start &&
232 end > fam10h_mmconf_end) {
233 /* we got a hole */
234 endx = fam10h_mmconf_start - 1;
235 update_res(info, start, endx, IORESOURCE_MEM, 0);
236 subtract_range(range, RANGE_NUM, start,
237 endx + 1);
238 printk(KERN_CONT " ==> [%llx, %llx]", start, endx);
239 start = fam10h_mmconf_end + 1;
240 changed = 1;
241 }
242 if (changed) {
243 if (start <= end) {
244 printk(KERN_CONT " %s [%llx, %llx]", endx ? "and" : "==>", start, end);
245 } else {
246 printk(KERN_CONT "%s\n", endx?"":" ==> none");
247 continue;
248 }
249 }
250 }
251
252 update_res(info, cap_resource(start), cap_resource(end),
253 IORESOURCE_MEM, 1);
254 subtract_range(range, RANGE_NUM, start, end + 1);
255 printk(KERN_CONT "\n");
256 }
257
258 /* need to take out [4G, TOM2) for RAM*/
259 /* SYS_CFG */
260 address = MSR_K8_SYSCFG;
261 rdmsrl(address, val);
262 /* TOP_MEM2 is enabled? */
263 if (val & (1<<21)) {
264 /* TOP_MEM2 */
265 address = MSR_K8_TOP_MEM2;
266 rdmsrl(address, val);
267 end = (val & 0xffffff800000ULL);
268 printk(KERN_INFO "TOM2: %016llx aka %lldM\n", end, end>>20);
269 subtract_range(range, RANGE_NUM, 1ULL<<32, end);
270 }
271
272 /*
273 * add left over mmio range to def node/link ?
274 * that is tricky, just record range in from start_min to 4G
275 */
276 info = find_pci_root_info(def_node, def_link);
277 if (info) {
278 for (i = 0; i < RANGE_NUM; i++) {
279 if (!range[i].end)
280 continue;
281
282 update_res(info, cap_resource(range[i].start),
283 cap_resource(range[i].end - 1),
284 IORESOURCE_MEM, 1);
285 }
286 }
287
288 list_for_each_entry(info, &pci_root_infos, list) {
289 int busnum;
290 struct pci_root_res *root_res;
291
292 busnum = info->busn.start;
293 printk(KERN_DEBUG "bus: %pR on node %x link %x\n",
294 &info->busn, info->node, info->link);
295 list_for_each_entry(root_res, &info->resources, list)
296 printk(KERN_DEBUG "bus: %02x %pR\n",
297 busnum, &root_res->res);
298 }
299
300 return 0;
301}
302
303#define ENABLE_CF8_EXT_CFG (1ULL << 46)
304
305static void enable_pci_io_ecs(void *unused)
306{
307 u64 reg;
308 rdmsrl(MSR_AMD64_NB_CFG, reg);
309 if (!(reg & ENABLE_CF8_EXT_CFG)) {
310 reg |= ENABLE_CF8_EXT_CFG;
311 wrmsrl(MSR_AMD64_NB_CFG, reg);
312 }
313}
314
315static int amd_cpu_notify(struct notifier_block *self, unsigned long action,
316 void *hcpu)
317{
318 int cpu = (long)hcpu;
319 switch (action) {
320 case CPU_ONLINE:
321 case CPU_ONLINE_FROZEN:
322 smp_call_function_single(cpu, enable_pci_io_ecs, NULL, 0);
323 break;
324 default:
325 break;
326 }
327 return NOTIFY_OK;
328}
329
330static struct notifier_block amd_cpu_notifier = {
331 .notifier_call = amd_cpu_notify,
332};
333
334static void __init pci_enable_pci_io_ecs(void)
335{
336#ifdef CONFIG_AMD_NB
337 unsigned int i, n;
338
339 for (n = i = 0; !n && amd_nb_bus_dev_ranges[i].dev_limit; ++i) {
340 u8 bus = amd_nb_bus_dev_ranges[i].bus;
341 u8 slot = amd_nb_bus_dev_ranges[i].dev_base;
342 u8 limit = amd_nb_bus_dev_ranges[i].dev_limit;
343
344 for (; slot < limit; ++slot) {
345 u32 val = read_pci_config(bus, slot, 3, 0);
346
347 if (!early_is_amd_nb(val))
348 continue;
349
350 val = read_pci_config(bus, slot, 3, 0x8c);
351 if (!(val & (ENABLE_CF8_EXT_CFG >> 32))) {
352 val |= ENABLE_CF8_EXT_CFG >> 32;
353 write_pci_config(bus, slot, 3, 0x8c, val);
354 }
355 ++n;
356 }
357 }
358#endif
359}
360
361static int __init pci_io_ecs_init(void)
362{
363 int cpu;
364
365 /* assume all cpus from fam10h have IO ECS */
366 if (boot_cpu_data.x86 < 0x10)
367 return 0;
368
369 /* Try the PCI method first. */
370 if (early_pci_allowed())
371 pci_enable_pci_io_ecs();
372
373 cpu_notifier_register_begin();
374 for_each_online_cpu(cpu)
375 amd_cpu_notify(&amd_cpu_notifier, (unsigned long)CPU_ONLINE,
376 (void *)(long)cpu);
377 __register_cpu_notifier(&amd_cpu_notifier);
378 cpu_notifier_register_done();
379
380 pci_probe |= PCI_HAS_IO_ECS;
381
382 return 0;
383}
384
385static int __init amd_postcore_init(void)
386{
387 if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD)
388 return 0;
389
390 early_fill_mp_bus_info();
391 pci_io_ecs_init();
392
393 return 0;
394}
395
396postcore_initcall(amd_postcore_init);
1#include <linux/init.h>
2#include <linux/pci.h>
3#include <linux/topology.h>
4#include <linux/cpu.h>
5#include <linux/range.h>
6
7#include <asm/amd_nb.h>
8#include <asm/pci_x86.h>
9
10#include <asm/pci-direct.h>
11
12#include "bus_numa.h"
13
14#define AMD_NB_F0_NODE_ID 0x60
15#define AMD_NB_F0_UNIT_ID 0x64
16#define AMD_NB_F1_CONFIG_MAP_REG 0xe0
17
18#define RANGE_NUM 16
19#define AMD_NB_F1_CONFIG_MAP_RANGES 4
20
21struct amd_hostbridge {
22 u32 bus;
23 u32 slot;
24 u32 device;
25};
26
27/*
28 * IMPORTANT NOTE:
29 * hb_probes[] and early_root_info_init() is in maintenance mode.
30 * It only supports K8, Fam10h, Fam11h, and Fam15h_00h-0fh .
31 * Future processor will rely on information in ACPI.
32 */
33static struct amd_hostbridge hb_probes[] __initdata = {
34 { 0, 0x18, 0x1100 }, /* K8 */
35 { 0, 0x18, 0x1200 }, /* Family10h */
36 { 0xff, 0, 0x1200 }, /* Family10h */
37 { 0, 0x18, 0x1300 }, /* Family11h */
38 { 0, 0x18, 0x1600 }, /* Family15h */
39};
40
41static struct pci_root_info __init *find_pci_root_info(int node, int link)
42{
43 struct pci_root_info *info;
44
45 /* find the position */
46 list_for_each_entry(info, &pci_root_infos, list)
47 if (info->node == node && info->link == link)
48 return info;
49
50 return NULL;
51}
52
53/**
54 * early_root_info_init()
55 * called before pcibios_scan_root and pci_scan_bus
56 * fills the mp_bus_to_cpumask array based according
57 * to the LDT Bus Number Registers found in the northbridge.
58 */
59static int __init early_root_info_init(void)
60{
61 int i;
62 unsigned bus;
63 unsigned slot;
64 int node;
65 int link;
66 int def_node;
67 int def_link;
68 struct pci_root_info *info;
69 u32 reg;
70 u64 start;
71 u64 end;
72 struct range range[RANGE_NUM];
73 u64 val;
74 u32 address;
75 bool found;
76 struct resource fam10h_mmconf_res, *fam10h_mmconf;
77 u64 fam10h_mmconf_start;
78 u64 fam10h_mmconf_end;
79
80 if (!early_pci_allowed())
81 return -1;
82
83 found = false;
84 for (i = 0; i < ARRAY_SIZE(hb_probes); i++) {
85 u32 id;
86 u16 device;
87 u16 vendor;
88
89 bus = hb_probes[i].bus;
90 slot = hb_probes[i].slot;
91 id = read_pci_config(bus, slot, 0, PCI_VENDOR_ID);
92 vendor = id & 0xffff;
93 device = (id>>16) & 0xffff;
94
95 if (vendor != PCI_VENDOR_ID_AMD)
96 continue;
97
98 if (hb_probes[i].device == device) {
99 found = true;
100 break;
101 }
102 }
103
104 if (!found)
105 return 0;
106
107 /*
108 * We should learn topology and routing information from _PXM and
109 * _CRS methods in the ACPI namespace. We extract node numbers
110 * here to work around BIOSes that don't supply _PXM.
111 */
112 for (i = 0; i < AMD_NB_F1_CONFIG_MAP_RANGES; i++) {
113 int min_bus;
114 int max_bus;
115 reg = read_pci_config(bus, slot, 1,
116 AMD_NB_F1_CONFIG_MAP_REG + (i << 2));
117
118 /* Check if that register is enabled for bus range */
119 if ((reg & 7) != 3)
120 continue;
121
122 min_bus = (reg >> 16) & 0xff;
123 max_bus = (reg >> 24) & 0xff;
124 node = (reg >> 4) & 0x07;
125 link = (reg >> 8) & 0x03;
126
127 info = alloc_pci_root_info(min_bus, max_bus, node, link);
128 }
129
130 /*
131 * The following code extracts routing information for use on old
132 * systems where Linux doesn't automatically use host bridge _CRS
133 * methods (or when the user specifies "pci=nocrs").
134 *
135 * We only do this through Fam11h, because _CRS should be enough on
136 * newer systems.
137 */
138 if (boot_cpu_data.x86 > 0x11)
139 return 0;
140
141 /* get the default node and link for left over res */
142 reg = read_pci_config(bus, slot, 0, AMD_NB_F0_NODE_ID);
143 def_node = (reg >> 8) & 0x07;
144 reg = read_pci_config(bus, slot, 0, AMD_NB_F0_UNIT_ID);
145 def_link = (reg >> 8) & 0x03;
146
147 memset(range, 0, sizeof(range));
148 add_range(range, RANGE_NUM, 0, 0, 0xffff + 1);
149 /* io port resource */
150 for (i = 0; i < 4; i++) {
151 reg = read_pci_config(bus, slot, 1, 0xc0 + (i << 3));
152 if (!(reg & 3))
153 continue;
154
155 start = reg & 0xfff000;
156 reg = read_pci_config(bus, slot, 1, 0xc4 + (i << 3));
157 node = reg & 0x07;
158 link = (reg >> 4) & 0x03;
159 end = (reg & 0xfff000) | 0xfff;
160
161 info = find_pci_root_info(node, link);
162 if (!info)
163 continue; /* not found */
164
165 printk(KERN_DEBUG "node %d link %d: io port [%llx, %llx]\n",
166 node, link, start, end);
167
168 /* kernel only handle 16 bit only */
169 if (end > 0xffff)
170 end = 0xffff;
171 update_res(info, start, end, IORESOURCE_IO, 1);
172 subtract_range(range, RANGE_NUM, start, end + 1);
173 }
174 /* add left over io port range to def node/link, [0, 0xffff] */
175 /* find the position */
176 info = find_pci_root_info(def_node, def_link);
177 if (info) {
178 for (i = 0; i < RANGE_NUM; i++) {
179 if (!range[i].end)
180 continue;
181
182 update_res(info, range[i].start, range[i].end - 1,
183 IORESOURCE_IO, 1);
184 }
185 }
186
187 memset(range, 0, sizeof(range));
188 /* 0xfd00000000-0xffffffffff for HT */
189 end = cap_resource((0xfdULL<<32) - 1);
190 end++;
191 add_range(range, RANGE_NUM, 0, 0, end);
192
193 /* need to take out [0, TOM) for RAM*/
194 address = MSR_K8_TOP_MEM1;
195 rdmsrl(address, val);
196 end = (val & 0xffffff800000ULL);
197 printk(KERN_INFO "TOM: %016llx aka %lldM\n", end, end>>20);
198 if (end < (1ULL<<32))
199 subtract_range(range, RANGE_NUM, 0, end);
200
201 /* get mmconfig */
202 fam10h_mmconf = amd_get_mmconfig_range(&fam10h_mmconf_res);
203 /* need to take out mmconf range */
204 if (fam10h_mmconf) {
205 printk(KERN_DEBUG "Fam 10h mmconf %pR\n", fam10h_mmconf);
206 fam10h_mmconf_start = fam10h_mmconf->start;
207 fam10h_mmconf_end = fam10h_mmconf->end;
208 subtract_range(range, RANGE_NUM, fam10h_mmconf_start,
209 fam10h_mmconf_end + 1);
210 } else {
211 fam10h_mmconf_start = 0;
212 fam10h_mmconf_end = 0;
213 }
214
215 /* mmio resource */
216 for (i = 0; i < 8; i++) {
217 reg = read_pci_config(bus, slot, 1, 0x80 + (i << 3));
218 if (!(reg & 3))
219 continue;
220
221 start = reg & 0xffffff00; /* 39:16 on 31:8*/
222 start <<= 8;
223 reg = read_pci_config(bus, slot, 1, 0x84 + (i << 3));
224 node = reg & 0x07;
225 link = (reg >> 4) & 0x03;
226 end = (reg & 0xffffff00);
227 end <<= 8;
228 end |= 0xffff;
229
230 info = find_pci_root_info(node, link);
231
232 if (!info)
233 continue;
234
235 printk(KERN_DEBUG "node %d link %d: mmio [%llx, %llx]",
236 node, link, start, end);
237 /*
238 * some sick allocation would have range overlap with fam10h
239 * mmconf range, so need to update start and end.
240 */
241 if (fam10h_mmconf_end) {
242 int changed = 0;
243 u64 endx = 0;
244 if (start >= fam10h_mmconf_start &&
245 start <= fam10h_mmconf_end) {
246 start = fam10h_mmconf_end + 1;
247 changed = 1;
248 }
249
250 if (end >= fam10h_mmconf_start &&
251 end <= fam10h_mmconf_end) {
252 end = fam10h_mmconf_start - 1;
253 changed = 1;
254 }
255
256 if (start < fam10h_mmconf_start &&
257 end > fam10h_mmconf_end) {
258 /* we got a hole */
259 endx = fam10h_mmconf_start - 1;
260 update_res(info, start, endx, IORESOURCE_MEM, 0);
261 subtract_range(range, RANGE_NUM, start,
262 endx + 1);
263 printk(KERN_CONT " ==> [%llx, %llx]", start, endx);
264 start = fam10h_mmconf_end + 1;
265 changed = 1;
266 }
267 if (changed) {
268 if (start <= end) {
269 printk(KERN_CONT " %s [%llx, %llx]", endx ? "and" : "==>", start, end);
270 } else {
271 printk(KERN_CONT "%s\n", endx?"":" ==> none");
272 continue;
273 }
274 }
275 }
276
277 update_res(info, cap_resource(start), cap_resource(end),
278 IORESOURCE_MEM, 1);
279 subtract_range(range, RANGE_NUM, start, end + 1);
280 printk(KERN_CONT "\n");
281 }
282
283 /* need to take out [4G, TOM2) for RAM*/
284 /* SYS_CFG */
285 address = MSR_K8_SYSCFG;
286 rdmsrl(address, val);
287 /* TOP_MEM2 is enabled? */
288 if (val & (1<<21)) {
289 /* TOP_MEM2 */
290 address = MSR_K8_TOP_MEM2;
291 rdmsrl(address, val);
292 end = (val & 0xffffff800000ULL);
293 printk(KERN_INFO "TOM2: %016llx aka %lldM\n", end, end>>20);
294 subtract_range(range, RANGE_NUM, 1ULL<<32, end);
295 }
296
297 /*
298 * add left over mmio range to def node/link ?
299 * that is tricky, just record range in from start_min to 4G
300 */
301 info = find_pci_root_info(def_node, def_link);
302 if (info) {
303 for (i = 0; i < RANGE_NUM; i++) {
304 if (!range[i].end)
305 continue;
306
307 update_res(info, cap_resource(range[i].start),
308 cap_resource(range[i].end - 1),
309 IORESOURCE_MEM, 1);
310 }
311 }
312
313 list_for_each_entry(info, &pci_root_infos, list) {
314 int busnum;
315 struct pci_root_res *root_res;
316
317 busnum = info->busn.start;
318 printk(KERN_DEBUG "bus: %pR on node %x link %x\n",
319 &info->busn, info->node, info->link);
320 list_for_each_entry(root_res, &info->resources, list)
321 printk(KERN_DEBUG "bus: %02x %pR\n",
322 busnum, &root_res->res);
323 }
324
325 return 0;
326}
327
328#define ENABLE_CF8_EXT_CFG (1ULL << 46)
329
330static void enable_pci_io_ecs(void *unused)
331{
332 u64 reg;
333 rdmsrl(MSR_AMD64_NB_CFG, reg);
334 if (!(reg & ENABLE_CF8_EXT_CFG)) {
335 reg |= ENABLE_CF8_EXT_CFG;
336 wrmsrl(MSR_AMD64_NB_CFG, reg);
337 }
338}
339
340static int amd_cpu_notify(struct notifier_block *self, unsigned long action,
341 void *hcpu)
342{
343 int cpu = (long)hcpu;
344 switch (action) {
345 case CPU_ONLINE:
346 case CPU_ONLINE_FROZEN:
347 smp_call_function_single(cpu, enable_pci_io_ecs, NULL, 0);
348 break;
349 default:
350 break;
351 }
352 return NOTIFY_OK;
353}
354
355static struct notifier_block amd_cpu_notifier = {
356 .notifier_call = amd_cpu_notify,
357};
358
359static void __init pci_enable_pci_io_ecs(void)
360{
361#ifdef CONFIG_AMD_NB
362 unsigned int i, n;
363
364 for (n = i = 0; !n && amd_nb_bus_dev_ranges[i].dev_limit; ++i) {
365 u8 bus = amd_nb_bus_dev_ranges[i].bus;
366 u8 slot = amd_nb_bus_dev_ranges[i].dev_base;
367 u8 limit = amd_nb_bus_dev_ranges[i].dev_limit;
368
369 for (; slot < limit; ++slot) {
370 u32 val = read_pci_config(bus, slot, 3, 0);
371
372 if (!early_is_amd_nb(val))
373 continue;
374
375 val = read_pci_config(bus, slot, 3, 0x8c);
376 if (!(val & (ENABLE_CF8_EXT_CFG >> 32))) {
377 val |= ENABLE_CF8_EXT_CFG >> 32;
378 write_pci_config(bus, slot, 3, 0x8c, val);
379 }
380 ++n;
381 }
382 }
383#endif
384}
385
386static int __init pci_io_ecs_init(void)
387{
388 int cpu;
389
390 /* assume all cpus from fam10h have IO ECS */
391 if (boot_cpu_data.x86 < 0x10)
392 return 0;
393
394 /* Try the PCI method first. */
395 if (early_pci_allowed())
396 pci_enable_pci_io_ecs();
397
398 cpu_notifier_register_begin();
399 for_each_online_cpu(cpu)
400 amd_cpu_notify(&amd_cpu_notifier, (unsigned long)CPU_ONLINE,
401 (void *)(long)cpu);
402 __register_cpu_notifier(&amd_cpu_notifier);
403 cpu_notifier_register_done();
404
405 pci_probe |= PCI_HAS_IO_ECS;
406
407 return 0;
408}
409
410static int __init amd_postcore_init(void)
411{
412 if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD)
413 return 0;
414
415 early_root_info_init();
416 pci_io_ecs_init();
417
418 return 0;
419}
420
421postcore_initcall(amd_postcore_init);