1 // SPDX-License-Identifier: GPL-2.0-only
3 * Shared support code for AMD K8 northbridges and derivatives.
4 * Copyright 2006 Andi Kleen, SUSE Labs.
7 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
9 #include <linux/types.h>
10 #include <linux/slab.h>
11 #include <linux/init.h>
12 #include <linux/errno.h>
13 #include <linux/export.h>
14 #include <linux/spinlock.h>
15 #include <linux/pci_ids.h>
16 #include <asm/amd_nb.h>
18 #define PCI_DEVICE_ID_AMD_17H_ROOT 0x1450
19 #define PCI_DEVICE_ID_AMD_17H_M10H_ROOT 0x15d0
20 #define PCI_DEVICE_ID_AMD_17H_M30H_ROOT 0x1480
21 #define PCI_DEVICE_ID_AMD_17H_M60H_ROOT 0x1630
22 #define PCI_DEVICE_ID_AMD_17H_MA0H_ROOT 0x14b5
23 #define PCI_DEVICE_ID_AMD_19H_M10H_ROOT 0x14a4
24 #define PCI_DEVICE_ID_AMD_19H_M40H_ROOT 0x14b5
25 #define PCI_DEVICE_ID_AMD_19H_M60H_ROOT 0x14d8
26 #define PCI_DEVICE_ID_AMD_19H_M70H_ROOT 0x14e8
27 #define PCI_DEVICE_ID_AMD_1AH_M00H_ROOT 0x153a
28 #define PCI_DEVICE_ID_AMD_1AH_M20H_ROOT 0x1507
29 #define PCI_DEVICE_ID_AMD_MI200_ROOT 0x14bb
30 #define PCI_DEVICE_ID_AMD_MI300_ROOT 0x14f8
32 #define PCI_DEVICE_ID_AMD_17H_DF_F4 0x1464
33 #define PCI_DEVICE_ID_AMD_17H_M10H_DF_F4 0x15ec
34 #define PCI_DEVICE_ID_AMD_17H_M30H_DF_F4 0x1494
35 #define PCI_DEVICE_ID_AMD_17H_M60H_DF_F4 0x144c
36 #define PCI_DEVICE_ID_AMD_17H_M70H_DF_F4 0x1444
37 #define PCI_DEVICE_ID_AMD_17H_MA0H_DF_F4 0x1728
38 #define PCI_DEVICE_ID_AMD_19H_DF_F4 0x1654
39 #define PCI_DEVICE_ID_AMD_19H_M10H_DF_F4 0x14b1
40 #define PCI_DEVICE_ID_AMD_19H_M40H_DF_F4 0x167d
41 #define PCI_DEVICE_ID_AMD_19H_M50H_DF_F4 0x166e
42 #define PCI_DEVICE_ID_AMD_19H_M60H_DF_F4 0x14e4
43 #define PCI_DEVICE_ID_AMD_19H_M70H_DF_F4 0x14f4
44 #define PCI_DEVICE_ID_AMD_19H_M78H_DF_F4 0x12fc
45 #define PCI_DEVICE_ID_AMD_1AH_M00H_DF_F4 0x12c4
46 #define PCI_DEVICE_ID_AMD_MI200_DF_F4 0x14d4
47 #define PCI_DEVICE_ID_AMD_MI300_DF_F4 0x152c
49 /* Protect the PCI config register pairs used for SMN. */
50 static DEFINE_MUTEX(smn_mutex);
52 static u32 *flush_words;
54 static const struct pci_device_id amd_root_ids[] = {
55 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_17H_ROOT) },
56 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_17H_M10H_ROOT) },
57 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_17H_M30H_ROOT) },
58 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_17H_M60H_ROOT) },
59 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_17H_MA0H_ROOT) },
60 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_19H_M10H_ROOT) },
61 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_19H_M40H_ROOT) },
62 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_19H_M60H_ROOT) },
63 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_19H_M70H_ROOT) },
64 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_1AH_M00H_ROOT) },
65 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_1AH_M20H_ROOT) },
66 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_MI200_ROOT) },
67 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_MI300_ROOT) },
71 #define PCI_DEVICE_ID_AMD_CNB17H_F4 0x1704
73 static const struct pci_device_id amd_nb_misc_ids[] = {
74 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_K8_NB_MISC) },
75 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_10H_NB_MISC) },
76 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_15H_NB_F3) },
77 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_15H_M10H_F3) },
78 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_15H_M30H_NB_F3) },
79 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_15H_M60H_NB_F3) },
80 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_16H_NB_F3) },
81 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_16H_M30H_NB_F3) },
82 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_17H_DF_F3) },
83 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_17H_M10H_DF_F3) },
84 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_17H_M30H_DF_F3) },
85 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_17H_M60H_DF_F3) },
86 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_17H_MA0H_DF_F3) },
87 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_CNB17H_F3) },
88 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_17H_M70H_DF_F3) },
89 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_19H_DF_F3) },
90 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_19H_M10H_DF_F3) },
91 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_19H_M40H_DF_F3) },
92 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_19H_M50H_DF_F3) },
93 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_19H_M60H_DF_F3) },
94 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_19H_M70H_DF_F3) },
95 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_19H_M78H_DF_F3) },
96 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_1AH_M00H_DF_F3) },
97 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_1AH_M20H_DF_F3) },
98 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_MI200_DF_F3) },
99 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_MI300_DF_F3) },
103 static const struct pci_device_id amd_nb_link_ids[] = {
104 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_15H_NB_F4) },
105 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_15H_M30H_NB_F4) },
106 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_15H_M60H_NB_F4) },
107 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_16H_NB_F4) },
108 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_16H_M30H_NB_F4) },
109 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_17H_DF_F4) },
110 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_17H_M10H_DF_F4) },
111 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_17H_M30H_DF_F4) },
112 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_17H_M60H_DF_F4) },
113 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_17H_M70H_DF_F4) },
114 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_17H_MA0H_DF_F4) },
115 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_19H_DF_F4) },
116 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_19H_M10H_DF_F4) },
117 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_19H_M40H_DF_F4) },
118 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_19H_M50H_DF_F4) },
119 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_19H_M60H_DF_F4) },
120 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_19H_M70H_DF_F4) },
121 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_19H_M78H_DF_F4) },
122 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_CNB17H_F4) },
123 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_1AH_M00H_DF_F4) },
124 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_MI200_DF_F4) },
125 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_MI300_DF_F4) },
129 static const struct pci_device_id hygon_root_ids[] = {
130 { PCI_DEVICE(PCI_VENDOR_ID_HYGON, PCI_DEVICE_ID_AMD_17H_ROOT) },
134 static const struct pci_device_id hygon_nb_misc_ids[] = {
135 { PCI_DEVICE(PCI_VENDOR_ID_HYGON, PCI_DEVICE_ID_AMD_17H_DF_F3) },
139 static const struct pci_device_id hygon_nb_link_ids[] = {
140 { PCI_DEVICE(PCI_VENDOR_ID_HYGON, PCI_DEVICE_ID_AMD_17H_DF_F4) },
144 const struct amd_nb_bus_dev_range amd_nb_bus_dev_ranges[] __initconst = {
145 { 0x00, 0x18, 0x20 },
146 { 0xff, 0x00, 0x20 },
147 { 0xfe, 0x00, 0x20 },
151 static struct amd_northbridge_info amd_northbridges;
155 return amd_northbridges.num;
157 EXPORT_SYMBOL_GPL(amd_nb_num);
159 bool amd_nb_has_feature(unsigned int feature)
161 return ((amd_northbridges.flags & feature) == feature);
163 EXPORT_SYMBOL_GPL(amd_nb_has_feature);
165 struct amd_northbridge *node_to_amd_nb(int node)
167 return (node < amd_northbridges.num) ? &amd_northbridges.nb[node] : NULL;
169 EXPORT_SYMBOL_GPL(node_to_amd_nb);
171 static struct pci_dev *next_northbridge(struct pci_dev *dev,
172 const struct pci_device_id *ids)
175 dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev);
178 } while (!pci_match_id(ids, dev));
182 static int __amd_smn_rw(u16 node, u32 address, u32 *value, bool write)
184 struct pci_dev *root;
187 if (node >= amd_northbridges.num)
190 root = node_to_amd_nb(node)->root;
194 mutex_lock(&smn_mutex);
196 err = pci_write_config_dword(root, 0x60, address);
198 pr_warn("Error programming SMN address 0x%x.\n", address);
202 err = (write ? pci_write_config_dword(root, 0x64, *value)
203 : pci_read_config_dword(root, 0x64, value));
205 pr_warn("Error %s SMN address 0x%x.\n",
206 (write ? "writing to" : "reading from"), address);
209 mutex_unlock(&smn_mutex);
215 int amd_smn_read(u16 node, u32 address, u32 *value)
217 return __amd_smn_rw(node, address, value, false);
219 EXPORT_SYMBOL_GPL(amd_smn_read);
221 int amd_smn_write(u16 node, u32 address, u32 value)
223 return __amd_smn_rw(node, address, &value, true);
225 EXPORT_SYMBOL_GPL(amd_smn_write);
228 static int amd_cache_northbridges(void)
230 const struct pci_device_id *misc_ids = amd_nb_misc_ids;
231 const struct pci_device_id *link_ids = amd_nb_link_ids;
232 const struct pci_device_id *root_ids = amd_root_ids;
233 struct pci_dev *root, *misc, *link;
234 struct amd_northbridge *nb;
235 u16 roots_per_misc = 0;
240 if (amd_northbridges.num)
243 if (boot_cpu_data.x86_vendor == X86_VENDOR_HYGON) {
244 root_ids = hygon_root_ids;
245 misc_ids = hygon_nb_misc_ids;
246 link_ids = hygon_nb_link_ids;
250 while ((misc = next_northbridge(misc, misc_ids)))
257 while ((root = next_northbridge(root, root_ids)))
261 roots_per_misc = root_count / misc_count;
264 * There should be _exactly_ N roots for each DF/SMN
267 if (!roots_per_misc || (root_count % roots_per_misc)) {
268 pr_info("Unsupported AMD DF/PCI configuration found\n");
273 nb = kcalloc(misc_count, sizeof(struct amd_northbridge), GFP_KERNEL);
277 amd_northbridges.nb = nb;
278 amd_northbridges.num = misc_count;
280 link = misc = root = NULL;
281 for (i = 0; i < amd_northbridges.num; i++) {
282 node_to_amd_nb(i)->root = root =
283 next_northbridge(root, root_ids);
284 node_to_amd_nb(i)->misc = misc =
285 next_northbridge(misc, misc_ids);
286 node_to_amd_nb(i)->link = link =
287 next_northbridge(link, link_ids);
290 * If there are more PCI root devices than data fabric/
291 * system management network interfaces, then the (N)
292 * PCI roots per DF/SMN interface are functionally the
293 * same (for DF/SMN access) and N-1 are redundant. N-1
294 * PCI roots should be skipped per DF/SMN interface so
295 * the following DF/SMN interfaces get mapped to
298 for (j = 1; j < roots_per_misc; j++)
299 root = next_northbridge(root, root_ids);
302 if (amd_gart_present())
303 amd_northbridges.flags |= AMD_NB_GART;
306 * Check for L3 cache presence.
308 if (!cpuid_edx(0x80000006))
312 * Some CPU families support L3 Cache Index Disable. There are some
313 * limitations because of E382 and E388 on family 0x10.
315 if (boot_cpu_data.x86 == 0x10 &&
316 boot_cpu_data.x86_model >= 0x8 &&
317 (boot_cpu_data.x86_model > 0x9 ||
318 boot_cpu_data.x86_stepping >= 0x1))
319 amd_northbridges.flags |= AMD_NB_L3_INDEX_DISABLE;
321 if (boot_cpu_data.x86 == 0x15)
322 amd_northbridges.flags |= AMD_NB_L3_INDEX_DISABLE;
324 /* L3 cache partitioning is supported on family 0x15 */
325 if (boot_cpu_data.x86 == 0x15)
326 amd_northbridges.flags |= AMD_NB_L3_PARTITIONING;
332 * Ignores subdevice/subvendor but as far as I can figure out
333 * they're useless anyways
335 bool __init early_is_amd_nb(u32 device)
337 const struct pci_device_id *misc_ids = amd_nb_misc_ids;
338 const struct pci_device_id *id;
339 u32 vendor = device & 0xffff;
341 if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD &&
342 boot_cpu_data.x86_vendor != X86_VENDOR_HYGON)
345 if (boot_cpu_data.x86_vendor == X86_VENDOR_HYGON)
346 misc_ids = hygon_nb_misc_ids;
349 for (id = misc_ids; id->vendor; id++)
350 if (vendor == id->vendor && device == id->device)
355 struct resource *amd_get_mmconfig_range(struct resource *res)
359 unsigned int segn_busn_bits;
361 if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD &&
362 boot_cpu_data.x86_vendor != X86_VENDOR_HYGON)
365 /* assume all cpus from fam10h have mmconfig */
366 if (boot_cpu_data.x86 < 0x10)
369 address = MSR_FAM10H_MMIO_CONF_BASE;
370 rdmsrl(address, msr);
372 /* mmconfig is not enabled */
373 if (!(msr & FAM10H_MMIO_CONF_ENABLE))
376 base = msr & (FAM10H_MMIO_CONF_BASE_MASK<<FAM10H_MMIO_CONF_BASE_SHIFT);
378 segn_busn_bits = (msr >> FAM10H_MMIO_CONF_BUSRANGE_SHIFT) &
379 FAM10H_MMIO_CONF_BUSRANGE_MASK;
381 res->flags = IORESOURCE_MEM;
383 res->end = base + (1ULL<<(segn_busn_bits + 20)) - 1;
387 int amd_get_subcaches(int cpu)
389 struct pci_dev *link = node_to_amd_nb(topology_amd_node_id(cpu))->link;
392 if (!amd_nb_has_feature(AMD_NB_L3_PARTITIONING))
395 pci_read_config_dword(link, 0x1d4, &mask);
397 return (mask >> (4 * cpu_data(cpu).topo.core_id)) & 0xf;
400 int amd_set_subcaches(int cpu, unsigned long mask)
402 static unsigned int reset, ban;
403 struct amd_northbridge *nb = node_to_amd_nb(topology_amd_node_id(cpu));
407 if (!amd_nb_has_feature(AMD_NB_L3_PARTITIONING) || mask > 0xf)
410 /* if necessary, collect reset state of L3 partitioning and BAN mode */
412 pci_read_config_dword(nb->link, 0x1d4, &reset);
413 pci_read_config_dword(nb->misc, 0x1b8, &ban);
417 /* deactivate BAN mode if any subcaches are to be disabled */
419 pci_read_config_dword(nb->misc, 0x1b8, ®);
420 pci_write_config_dword(nb->misc, 0x1b8, reg & ~0x180000);
423 cuid = cpu_data(cpu).topo.core_id;
425 mask |= (0xf ^ (1 << cuid)) << 26;
427 pci_write_config_dword(nb->link, 0x1d4, mask);
429 /* reset BAN mode if L3 partitioning returned to reset state */
430 pci_read_config_dword(nb->link, 0x1d4, ®);
432 pci_read_config_dword(nb->misc, 0x1b8, ®);
434 pci_write_config_dword(nb->misc, 0x1b8, reg | ban);
440 static void amd_cache_gart(void)
444 if (!amd_nb_has_feature(AMD_NB_GART))
447 flush_words = kmalloc_array(amd_northbridges.num, sizeof(u32), GFP_KERNEL);
449 amd_northbridges.flags &= ~AMD_NB_GART;
450 pr_notice("Cannot initialize GART flush words, GART support disabled\n");
454 for (i = 0; i != amd_northbridges.num; i++)
455 pci_read_config_dword(node_to_amd_nb(i)->misc, 0x9c, &flush_words[i]);
458 void amd_flush_garts(void)
462 static DEFINE_SPINLOCK(gart_lock);
464 if (!amd_nb_has_feature(AMD_NB_GART))
468 * Avoid races between AGP and IOMMU. In theory it's not needed
469 * but I'm not sure if the hardware won't lose flush requests
470 * when another is pending. This whole thing is so expensive anyways
471 * that it doesn't matter to serialize more. -AK
473 spin_lock_irqsave(&gart_lock, flags);
475 for (i = 0; i < amd_northbridges.num; i++) {
476 pci_write_config_dword(node_to_amd_nb(i)->misc, 0x9c,
480 for (i = 0; i < amd_northbridges.num; i++) {
482 /* Make sure the hardware actually executed the flush*/
484 pci_read_config_dword(node_to_amd_nb(i)->misc,
491 spin_unlock_irqrestore(&gart_lock, flags);
493 pr_notice("nothing to flush?\n");
495 EXPORT_SYMBOL_GPL(amd_flush_garts);
497 static void __fix_erratum_688(void *info)
499 #define MSR_AMD64_IC_CFG 0xC0011021
501 msr_set_bit(MSR_AMD64_IC_CFG, 3);
502 msr_set_bit(MSR_AMD64_IC_CFG, 14);
505 /* Apply erratum 688 fix so machines without a BIOS fix work. */
506 static __init void fix_erratum_688(void)
511 if (boot_cpu_data.x86 != 0x14)
514 if (!amd_northbridges.num)
517 F4 = node_to_amd_nb(0)->link;
521 if (pci_read_config_dword(F4, 0x164, &val))
527 on_each_cpu(__fix_erratum_688, NULL, 0);
529 pr_info("x86/cpu/AMD: CPU erratum 688 worked around\n");
532 static __init int init_amd_nbs(void)
534 amd_cache_northbridges();
542 /* This has to go after the PCI subsystem */
543 fs_initcall(init_amd_nbs);