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Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/kaber/nf-2.6
[mirror_ubuntu-bionic-kernel.git] / arch / x86 / pci / amd_bus.c
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
19 struct pci_hostbridge_probe {
20 u32 bus;
21 u32 slot;
22 u32 vendor;
23 u32 device;
24 };
25
26 static 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 static u64 __initdata fam10h_mmconf_start;
34 static u64 __initdata fam10h_mmconf_end;
35 static void __init get_pci_mmcfg_amd_fam10h_range(void)
36 {
37 u32 address;
38 u64 base, msr;
39 unsigned segn_busn_bits;
40
41 /* assume all cpus from fam10h have mmconf */
42 if (boot_cpu_data.x86 < 0x10)
43 return;
44
45 address = MSR_FAM10H_MMIO_CONF_BASE;
46 rdmsrl(address, msr);
47
48 /* mmconfig is not enable */
49 if (!(msr & FAM10H_MMIO_CONF_ENABLE))
50 return;
51
52 base = msr & (FAM10H_MMIO_CONF_BASE_MASK<<FAM10H_MMIO_CONF_BASE_SHIFT);
53
54 segn_busn_bits = (msr >> FAM10H_MMIO_CONF_BUSRANGE_SHIFT) &
55 FAM10H_MMIO_CONF_BUSRANGE_MASK;
56
57 fam10h_mmconf_start = base;
58 fam10h_mmconf_end = base + (1ULL<<(segn_busn_bits + 20)) - 1;
59 }
60
61 #define RANGE_NUM 16
62
63 /**
64 * early_fill_mp_bus_to_node()
65 * called before pcibios_scan_root and pci_scan_bus
66 * fills the mp_bus_to_cpumask array based according to the LDT Bus Number
67 * Registers found in the K8 northbridge
68 */
69 static int __init early_fill_mp_bus_info(void)
70 {
71 int i;
72 int j;
73 unsigned bus;
74 unsigned slot;
75 int node;
76 int link;
77 int def_node;
78 int def_link;
79 struct pci_root_info *info;
80 u32 reg;
81 struct resource *res;
82 u64 start;
83 u64 end;
84 struct range range[RANGE_NUM];
85 u64 val;
86 u32 address;
87 bool found;
88
89 if (!early_pci_allowed())
90 return -1;
91
92 found = false;
93 for (i = 0; i < ARRAY_SIZE(pci_probes); i++) {
94 u32 id;
95 u16 device;
96 u16 vendor;
97
98 bus = pci_probes[i].bus;
99 slot = pci_probes[i].slot;
100 id = read_pci_config(bus, slot, 0, PCI_VENDOR_ID);
101
102 vendor = id & 0xffff;
103 device = (id>>16) & 0xffff;
104 if (pci_probes[i].vendor == vendor &&
105 pci_probes[i].device == device) {
106 found = true;
107 break;
108 }
109 }
110
111 if (!found)
112 return 0;
113
114 pci_root_num = 0;
115 for (i = 0; i < 4; i++) {
116 int min_bus;
117 int max_bus;
118 reg = read_pci_config(bus, slot, 1, 0xe0 + (i << 2));
119
120 /* Check if that register is enabled for bus range */
121 if ((reg & 7) != 3)
122 continue;
123
124 min_bus = (reg >> 16) & 0xff;
125 max_bus = (reg >> 24) & 0xff;
126 node = (reg >> 4) & 0x07;
127 #ifdef CONFIG_NUMA
128 for (j = min_bus; j <= max_bus; j++)
129 set_mp_bus_to_node(j, node);
130 #endif
131 link = (reg >> 8) & 0x03;
132
133 info = &pci_root_info[pci_root_num];
134 info->bus_min = min_bus;
135 info->bus_max = max_bus;
136 info->node = node;
137 info->link = link;
138 sprintf(info->name, "PCI Bus #%02x", min_bus);
139 pci_root_num++;
140 }
141
142 /* get the default node and link for left over res */
143 reg = read_pci_config(bus, slot, 0, 0x60);
144 def_node = (reg >> 8) & 0x07;
145 reg = read_pci_config(bus, slot, 0, 0x64);
146 def_link = (reg >> 8) & 0x03;
147
148 memset(range, 0, sizeof(range));
149 add_range(range, RANGE_NUM, 0, 0, 0xffff + 1);
150 /* io port resource */
151 for (i = 0; i < 4; i++) {
152 reg = read_pci_config(bus, slot, 1, 0xc0 + (i << 3));
153 if (!(reg & 3))
154 continue;
155
156 start = reg & 0xfff000;
157 reg = read_pci_config(bus, slot, 1, 0xc4 + (i << 3));
158 node = reg & 0x07;
159 link = (reg >> 4) & 0x03;
160 end = (reg & 0xfff000) | 0xfff;
161
162 /* find the position */
163 for (j = 0; j < pci_root_num; j++) {
164 info = &pci_root_info[j];
165 if (info->node == node && info->link == link)
166 break;
167 }
168 if (j == pci_root_num)
169 continue; /* not found */
170
171 info = &pci_root_info[j];
172 printk(KERN_DEBUG "node %d link %d: io port [%llx, %llx]\n",
173 node, link, start, end);
174
175 /* kernel only handle 16 bit only */
176 if (end > 0xffff)
177 end = 0xffff;
178 update_res(info, start, end, IORESOURCE_IO, 1);
179 subtract_range(range, RANGE_NUM, start, end + 1);
180 }
181 /* add left over io port range to def node/link, [0, 0xffff] */
182 /* find the position */
183 for (j = 0; j < pci_root_num; j++) {
184 info = &pci_root_info[j];
185 if (info->node == def_node && info->link == def_link)
186 break;
187 }
188 if (j < pci_root_num) {
189 info = &pci_root_info[j];
190 for (i = 0; i < RANGE_NUM; i++) {
191 if (!range[i].end)
192 continue;
193
194 update_res(info, range[i].start, range[i].end - 1,
195 IORESOURCE_IO, 1);
196 }
197 }
198
199 memset(range, 0, sizeof(range));
200 /* 0xfd00000000-0xffffffffff for HT */
201 end = cap_resource((0xfdULL<<32) - 1);
202 end++;
203 add_range(range, RANGE_NUM, 0, 0, end);
204
205 /* need to take out [0, TOM) for RAM*/
206 address = MSR_K8_TOP_MEM1;
207 rdmsrl(address, val);
208 end = (val & 0xffffff800000ULL);
209 printk(KERN_INFO "TOM: %016llx aka %lldM\n", end, end>>20);
210 if (end < (1ULL<<32))
211 subtract_range(range, RANGE_NUM, 0, end);
212
213 /* get mmconfig */
214 get_pci_mmcfg_amd_fam10h_range();
215 /* need to take out mmconf range */
216 if (fam10h_mmconf_end) {
217 printk(KERN_DEBUG "Fam 10h mmconf [%llx, %llx]\n", fam10h_mmconf_start, fam10h_mmconf_end);
218 subtract_range(range, RANGE_NUM, fam10h_mmconf_start,
219 fam10h_mmconf_end + 1);
220 }
221
222 /* mmio resource */
223 for (i = 0; i < 8; i++) {
224 reg = read_pci_config(bus, slot, 1, 0x80 + (i << 3));
225 if (!(reg & 3))
226 continue;
227
228 start = reg & 0xffffff00; /* 39:16 on 31:8*/
229 start <<= 8;
230 reg = read_pci_config(bus, slot, 1, 0x84 + (i << 3));
231 node = reg & 0x07;
232 link = (reg >> 4) & 0x03;
233 end = (reg & 0xffffff00);
234 end <<= 8;
235 end |= 0xffff;
236
237 /* find the position */
238 for (j = 0; j < pci_root_num; j++) {
239 info = &pci_root_info[j];
240 if (info->node == node && info->link == link)
241 break;
242 }
243 if (j == pci_root_num)
244 continue; /* not found */
245
246 info = &pci_root_info[j];
247
248 printk(KERN_DEBUG "node %d link %d: mmio [%llx, %llx]",
249 node, link, start, end);
250 /*
251 * some sick allocation would have range overlap with fam10h
252 * mmconf range, so need to update start and end.
253 */
254 if (fam10h_mmconf_end) {
255 int changed = 0;
256 u64 endx = 0;
257 if (start >= fam10h_mmconf_start &&
258 start <= fam10h_mmconf_end) {
259 start = fam10h_mmconf_end + 1;
260 changed = 1;
261 }
262
263 if (end >= fam10h_mmconf_start &&
264 end <= fam10h_mmconf_end) {
265 end = fam10h_mmconf_start - 1;
266 changed = 1;
267 }
268
269 if (start < fam10h_mmconf_start &&
270 end > fam10h_mmconf_end) {
271 /* we got a hole */
272 endx = fam10h_mmconf_start - 1;
273 update_res(info, start, endx, IORESOURCE_MEM, 0);
274 subtract_range(range, RANGE_NUM, start,
275 endx + 1);
276 printk(KERN_CONT " ==> [%llx, %llx]", start, endx);
277 start = fam10h_mmconf_end + 1;
278 changed = 1;
279 }
280 if (changed) {
281 if (start <= end) {
282 printk(KERN_CONT " %s [%llx, %llx]", endx ? "and" : "==>", start, end);
283 } else {
284 printk(KERN_CONT "%s\n", endx?"":" ==> none");
285 continue;
286 }
287 }
288 }
289
290 update_res(info, cap_resource(start), cap_resource(end),
291 IORESOURCE_MEM, 1);
292 subtract_range(range, RANGE_NUM, start, end + 1);
293 printk(KERN_CONT "\n");
294 }
295
296 /* need to take out [4G, TOM2) for RAM*/
297 /* SYS_CFG */
298 address = MSR_K8_SYSCFG;
299 rdmsrl(address, val);
300 /* TOP_MEM2 is enabled? */
301 if (val & (1<<21)) {
302 /* TOP_MEM2 */
303 address = MSR_K8_TOP_MEM2;
304 rdmsrl(address, val);
305 end = (val & 0xffffff800000ULL);
306 printk(KERN_INFO "TOM2: %016llx aka %lldM\n", end, end>>20);
307 subtract_range(range, RANGE_NUM, 1ULL<<32, end);
308 }
309
310 /*
311 * add left over mmio range to def node/link ?
312 * that is tricky, just record range in from start_min to 4G
313 */
314 for (j = 0; j < pci_root_num; j++) {
315 info = &pci_root_info[j];
316 if (info->node == def_node && info->link == def_link)
317 break;
318 }
319 if (j < pci_root_num) {
320 info = &pci_root_info[j];
321
322 for (i = 0; i < RANGE_NUM; i++) {
323 if (!range[i].end)
324 continue;
325
326 update_res(info, cap_resource(range[i].start),
327 cap_resource(range[i].end - 1),
328 IORESOURCE_MEM, 1);
329 }
330 }
331
332 for (i = 0; i < pci_root_num; i++) {
333 int res_num;
334 int busnum;
335
336 info = &pci_root_info[i];
337 res_num = info->res_num;
338 busnum = info->bus_min;
339 printk(KERN_DEBUG "bus: [%02x, %02x] on node %x link %x\n",
340 info->bus_min, info->bus_max, info->node, info->link);
341 for (j = 0; j < res_num; j++) {
342 res = &info->res[j];
343 printk(KERN_DEBUG "bus: %02x index %x %pR\n",
344 busnum, j, res);
345 }
346 }
347
348 return 0;
349 }
350
351 #define ENABLE_CF8_EXT_CFG (1ULL << 46)
352
353 static void enable_pci_io_ecs(void *unused)
354 {
355 u64 reg;
356 rdmsrl(MSR_AMD64_NB_CFG, reg);
357 if (!(reg & ENABLE_CF8_EXT_CFG)) {
358 reg |= ENABLE_CF8_EXT_CFG;
359 wrmsrl(MSR_AMD64_NB_CFG, reg);
360 }
361 }
362
363 static int __cpuinit amd_cpu_notify(struct notifier_block *self,
364 unsigned long action, void *hcpu)
365 {
366 int cpu = (long)hcpu;
367 switch (action) {
368 case CPU_ONLINE:
369 case CPU_ONLINE_FROZEN:
370 smp_call_function_single(cpu, enable_pci_io_ecs, NULL, 0);
371 break;
372 default:
373 break;
374 }
375 return NOTIFY_OK;
376 }
377
378 static struct notifier_block __cpuinitdata amd_cpu_notifier = {
379 .notifier_call = amd_cpu_notify,
380 };
381
382 static void __init pci_enable_pci_io_ecs(void)
383 {
384 #ifdef CONFIG_AMD_NB
385 unsigned int i, n;
386
387 for (n = i = 0; !n && amd_nb_bus_dev_ranges[i].dev_limit; ++i) {
388 u8 bus = amd_nb_bus_dev_ranges[i].bus;
389 u8 slot = amd_nb_bus_dev_ranges[i].dev_base;
390 u8 limit = amd_nb_bus_dev_ranges[i].dev_limit;
391
392 for (; slot < limit; ++slot) {
393 u32 val = read_pci_config(bus, slot, 3, 0);
394
395 if (!early_is_amd_nb(val))
396 continue;
397
398 val = read_pci_config(bus, slot, 3, 0x8c);
399 if (!(val & (ENABLE_CF8_EXT_CFG >> 32))) {
400 val |= ENABLE_CF8_EXT_CFG >> 32;
401 write_pci_config(bus, slot, 3, 0x8c, val);
402 }
403 ++n;
404 }
405 }
406 pr_info("Extended Config Space enabled on %u nodes\n", n);
407 #endif
408 }
409
410 static int __init pci_io_ecs_init(void)
411 {
412 int cpu;
413
414 /* assume all cpus from fam10h have IO ECS */
415 if (boot_cpu_data.x86 < 0x10)
416 return 0;
417
418 /* Try the PCI method first. */
419 if (early_pci_allowed())
420 pci_enable_pci_io_ecs();
421
422 register_cpu_notifier(&amd_cpu_notifier);
423 for_each_online_cpu(cpu)
424 amd_cpu_notify(&amd_cpu_notifier, (unsigned long)CPU_ONLINE,
425 (void *)(long)cpu);
426 pci_probe |= PCI_HAS_IO_ECS;
427
428 return 0;
429 }
430
431 static int __init amd_postcore_init(void)
432 {
433 if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD)
434 return 0;
435
436 early_fill_mp_bus_info();
437 pci_io_ecs_init();
438
439 return 0;
440 }
441
442 postcore_initcall(amd_postcore_init);