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1/*
2 * Shared support code for AMD K8 northbridges and derivates.
3 * Copyright 2006 Andi Kleen, SUSE Labs. Subject to GPLv2.
4 */
5#include <linux/types.h>
6#include <linux/slab.h>
7#include <linux/init.h>
8#include <linux/errno.h>
9#include <linux/module.h>
10#include <linux/spinlock.h>
11#include <asm/amd_nb.h>
12
13static u32 *flush_words;
14
15const struct pci_device_id amd_nb_misc_ids[] = {
16 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_K8_NB_MISC) },
17 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_10H_NB_MISC) },
18 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_15H_NB_F3) },
19 {}
20};
21EXPORT_SYMBOL(amd_nb_misc_ids);
22
23static struct pci_device_id amd_nb_link_ids[] = {
24 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_15H_NB_F4) },
25 {}
26};
27
28const struct amd_nb_bus_dev_range amd_nb_bus_dev_ranges[] __initconst = {
29 { 0x00, 0x18, 0x20 },
30 { 0xff, 0x00, 0x20 },
31 { 0xfe, 0x00, 0x20 },
32 { }
33};
34
35struct amd_northbridge_info amd_northbridges;
36EXPORT_SYMBOL(amd_northbridges);
37
38static struct pci_dev *next_northbridge(struct pci_dev *dev,
39 const struct pci_device_id *ids)
40{
41 do {
42 dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev);
43 if (!dev)
44 break;
45 } while (!pci_match_id(ids, dev));
46 return dev;
47}
48
49int amd_cache_northbridges(void)
50{
51 u16 i = 0;
52 struct amd_northbridge *nb;
53 struct pci_dev *misc, *link;
54
55 if (amd_nb_num())
56 return 0;
57
58 misc = NULL;
59 while ((misc = next_northbridge(misc, amd_nb_misc_ids)) != NULL)
60 i++;
61
62 if (i == 0)
63 return 0;
64
65 nb = kzalloc(i * sizeof(struct amd_northbridge), GFP_KERNEL);
66 if (!nb)
67 return -ENOMEM;
68
69 amd_northbridges.nb = nb;
70 amd_northbridges.num = i;
71
72 link = misc = NULL;
73 for (i = 0; i != amd_nb_num(); i++) {
74 node_to_amd_nb(i)->misc = misc =
75 next_northbridge(misc, amd_nb_misc_ids);
76 node_to_amd_nb(i)->link = link =
77 next_northbridge(link, amd_nb_link_ids);
78 }
79
80 /* some CPU families (e.g. family 0x11) do not support GART */
81 if (boot_cpu_data.x86 == 0xf || boot_cpu_data.x86 == 0x10 ||
82 boot_cpu_data.x86 == 0x15)
83 amd_northbridges.flags |= AMD_NB_GART;
84
85 /*
86 * Some CPU families support L3 Cache Index Disable. There are some
87 * limitations because of E382 and E388 on family 0x10.
88 */
89 if (boot_cpu_data.x86 == 0x10 &&
90 boot_cpu_data.x86_model >= 0x8 &&
91 (boot_cpu_data.x86_model > 0x9 ||
92 boot_cpu_data.x86_mask >= 0x1))
93 amd_northbridges.flags |= AMD_NB_L3_INDEX_DISABLE;
94
95 if (boot_cpu_data.x86 == 0x15)
96 amd_northbridges.flags |= AMD_NB_L3_INDEX_DISABLE;
97
98 /* L3 cache partitioning is supported on family 0x15 */
99 if (boot_cpu_data.x86 == 0x15)
100 amd_northbridges.flags |= AMD_NB_L3_PARTITIONING;
101
102 return 0;
103}
104EXPORT_SYMBOL_GPL(amd_cache_northbridges);
105
106/*
107 * Ignores subdevice/subvendor but as far as I can figure out
108 * they're useless anyways
109 */
110bool __init early_is_amd_nb(u32 device)
111{
112 const struct pci_device_id *id;
113 u32 vendor = device & 0xffff;
114
115 device >>= 16;
116 for (id = amd_nb_misc_ids; id->vendor; id++)
117 if (vendor == id->vendor && device == id->device)
118 return true;
119 return false;
120}
121
122struct resource *amd_get_mmconfig_range(struct resource *res)
123{
124 u32 address;
125 u64 base, msr;
126 unsigned segn_busn_bits;
127
128 if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD)
129 return NULL;
130
131 /* assume all cpus from fam10h have mmconfig */
132 if (boot_cpu_data.x86 < 0x10)
133 return NULL;
134
135 address = MSR_FAM10H_MMIO_CONF_BASE;
136 rdmsrl(address, msr);
137
138 /* mmconfig is not enabled */
139 if (!(msr & FAM10H_MMIO_CONF_ENABLE))
140 return NULL;
141
142 base = msr & (FAM10H_MMIO_CONF_BASE_MASK<<FAM10H_MMIO_CONF_BASE_SHIFT);
143
144 segn_busn_bits = (msr >> FAM10H_MMIO_CONF_BUSRANGE_SHIFT) &
145 FAM10H_MMIO_CONF_BUSRANGE_MASK;
146
147 res->flags = IORESOURCE_MEM;
148 res->start = base;
149 res->end = base + (1ULL<<(segn_busn_bits + 20)) - 1;
150 return res;
151}
152
153int amd_get_subcaches(int cpu)
154{
155 struct pci_dev *link = node_to_amd_nb(amd_get_nb_id(cpu))->link;
156 unsigned int mask;
157 int cuid;
158
159 if (!amd_nb_has_feature(AMD_NB_L3_PARTITIONING))
160 return 0;
161
162 pci_read_config_dword(link, 0x1d4, &mask);
163
164 cuid = cpu_data(cpu).compute_unit_id;
165 return (mask >> (4 * cuid)) & 0xf;
166}
167
168int amd_set_subcaches(int cpu, int mask)
169{
170 static unsigned int reset, ban;
171 struct amd_northbridge *nb = node_to_amd_nb(amd_get_nb_id(cpu));
172 unsigned int reg;
173 int cuid;
174
175 if (!amd_nb_has_feature(AMD_NB_L3_PARTITIONING) || mask > 0xf)
176 return -EINVAL;
177
178 /* if necessary, collect reset state of L3 partitioning and BAN mode */
179 if (reset == 0) {
180 pci_read_config_dword(nb->link, 0x1d4, &reset);
181 pci_read_config_dword(nb->misc, 0x1b8, &ban);
182 ban &= 0x180000;
183 }
184
185 /* deactivate BAN mode if any subcaches are to be disabled */
186 if (mask != 0xf) {
187 pci_read_config_dword(nb->misc, 0x1b8, ®);
188 pci_write_config_dword(nb->misc, 0x1b8, reg & ~0x180000);
189 }
190
191 cuid = cpu_data(cpu).compute_unit_id;
192 mask <<= 4 * cuid;
193 mask |= (0xf ^ (1 << cuid)) << 26;
194
195 pci_write_config_dword(nb->link, 0x1d4, mask);
196
197 /* reset BAN mode if L3 partitioning returned to reset state */
198 pci_read_config_dword(nb->link, 0x1d4, ®);
199 if (reg == reset) {
200 pci_read_config_dword(nb->misc, 0x1b8, ®);
201 reg &= ~0x180000;
202 pci_write_config_dword(nb->misc, 0x1b8, reg | ban);
203 }
204
205 return 0;
206}
207
208static int amd_cache_gart(void)
209{
210 u16 i;
211
212 if (!amd_nb_has_feature(AMD_NB_GART))
213 return 0;
214
215 flush_words = kmalloc(amd_nb_num() * sizeof(u32), GFP_KERNEL);
216 if (!flush_words) {
217 amd_northbridges.flags &= ~AMD_NB_GART;
218 return -ENOMEM;
219 }
220
221 for (i = 0; i != amd_nb_num(); i++)
222 pci_read_config_dword(node_to_amd_nb(i)->misc, 0x9c,
223 &flush_words[i]);
224
225 return 0;
226}
227
228void amd_flush_garts(void)
229{
230 int flushed, i;
231 unsigned long flags;
232 static DEFINE_SPINLOCK(gart_lock);
233
234 if (!amd_nb_has_feature(AMD_NB_GART))
235 return;
236
237 /* Avoid races between AGP and IOMMU. In theory it's not needed
238 but I'm not sure if the hardware won't lose flush requests
239 when another is pending. This whole thing is so expensive anyways
240 that it doesn't matter to serialize more. -AK */
241 spin_lock_irqsave(&gart_lock, flags);
242 flushed = 0;
243 for (i = 0; i < amd_nb_num(); i++) {
244 pci_write_config_dword(node_to_amd_nb(i)->misc, 0x9c,
245 flush_words[i] | 1);
246 flushed++;
247 }
248 for (i = 0; i < amd_nb_num(); i++) {
249 u32 w;
250 /* Make sure the hardware actually executed the flush*/
251 for (;;) {
252 pci_read_config_dword(node_to_amd_nb(i)->misc,
253 0x9c, &w);
254 if (!(w & 1))
255 break;
256 cpu_relax();
257 }
258 }
259 spin_unlock_irqrestore(&gart_lock, flags);
260 if (!flushed)
261 printk("nothing to flush?\n");
262}
263EXPORT_SYMBOL_GPL(amd_flush_garts);
264
265static __init int init_amd_nbs(void)
266{
267 int err = 0;
268
269 err = amd_cache_northbridges();
270
271 if (err < 0)
272 printk(KERN_NOTICE "AMD NB: Cannot enumerate AMD northbridges.\n");
273
274 if (amd_cache_gart() < 0)
275 printk(KERN_NOTICE "AMD NB: Cannot initialize GART flush words, "
276 "GART support disabled.\n");
277
278 return err;
279}
280
281/* This has to go after the PCI subsystem */
282fs_initcall(init_amd_nbs);
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Shared support code for AMD K8 northbridges and derivatives.
4 * Copyright 2006 Andi Kleen, SUSE Labs.
5 */
6
7#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
8
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>
17
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
31
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
48
49/* Protect the PCI config register pairs used for SMN. */
50static DEFINE_MUTEX(smn_mutex);
51
52static u32 *flush_words;
53
54static 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) },
68 {}
69};
70
71#define PCI_DEVICE_ID_AMD_CNB17H_F4 0x1704
72
73static 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_1AH_M70H_DF_F3) },
99 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_MI200_DF_F3) },
100 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_MI300_DF_F3) },
101 {}
102};
103
104static const struct pci_device_id amd_nb_link_ids[] = {
105 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_15H_NB_F4) },
106 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_15H_M30H_NB_F4) },
107 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_15H_M60H_NB_F4) },
108 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_16H_NB_F4) },
109 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_16H_M30H_NB_F4) },
110 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_17H_DF_F4) },
111 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_17H_M10H_DF_F4) },
112 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_17H_M30H_DF_F4) },
113 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_17H_M60H_DF_F4) },
114 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_17H_M70H_DF_F4) },
115 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_17H_MA0H_DF_F4) },
116 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_19H_DF_F4) },
117 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_19H_M10H_DF_F4) },
118 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_19H_M40H_DF_F4) },
119 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_19H_M50H_DF_F4) },
120 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_19H_M60H_DF_F4) },
121 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_19H_M70H_DF_F4) },
122 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_19H_M78H_DF_F4) },
123 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_CNB17H_F4) },
124 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_1AH_M00H_DF_F4) },
125 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_MI200_DF_F4) },
126 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_MI300_DF_F4) },
127 {}
128};
129
130static const struct pci_device_id hygon_root_ids[] = {
131 { PCI_DEVICE(PCI_VENDOR_ID_HYGON, PCI_DEVICE_ID_AMD_17H_ROOT) },
132 {}
133};
134
135static const struct pci_device_id hygon_nb_misc_ids[] = {
136 { PCI_DEVICE(PCI_VENDOR_ID_HYGON, PCI_DEVICE_ID_AMD_17H_DF_F3) },
137 {}
138};
139
140static const struct pci_device_id hygon_nb_link_ids[] = {
141 { PCI_DEVICE(PCI_VENDOR_ID_HYGON, PCI_DEVICE_ID_AMD_17H_DF_F4) },
142 {}
143};
144
145const struct amd_nb_bus_dev_range amd_nb_bus_dev_ranges[] __initconst = {
146 { 0x00, 0x18, 0x20 },
147 { 0xff, 0x00, 0x20 },
148 { 0xfe, 0x00, 0x20 },
149 { }
150};
151
152static struct amd_northbridge_info amd_northbridges;
153
154u16 amd_nb_num(void)
155{
156 return amd_northbridges.num;
157}
158EXPORT_SYMBOL_GPL(amd_nb_num);
159
160bool amd_nb_has_feature(unsigned int feature)
161{
162 return ((amd_northbridges.flags & feature) == feature);
163}
164EXPORT_SYMBOL_GPL(amd_nb_has_feature);
165
166struct amd_northbridge *node_to_amd_nb(int node)
167{
168 return (node < amd_northbridges.num) ? &amd_northbridges.nb[node] : NULL;
169}
170EXPORT_SYMBOL_GPL(node_to_amd_nb);
171
172static struct pci_dev *next_northbridge(struct pci_dev *dev,
173 const struct pci_device_id *ids)
174{
175 do {
176 dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev);
177 if (!dev)
178 break;
179 } while (!pci_match_id(ids, dev));
180 return dev;
181}
182
183static int __amd_smn_rw(u16 node, u32 address, u32 *value, bool write)
184{
185 struct pci_dev *root;
186 int err = -ENODEV;
187
188 if (node >= amd_northbridges.num)
189 goto out;
190
191 root = node_to_amd_nb(node)->root;
192 if (!root)
193 goto out;
194
195 mutex_lock(&smn_mutex);
196
197 err = pci_write_config_dword(root, 0x60, address);
198 if (err) {
199 pr_warn("Error programming SMN address 0x%x.\n", address);
200 goto out_unlock;
201 }
202
203 err = (write ? pci_write_config_dword(root, 0x64, *value)
204 : pci_read_config_dword(root, 0x64, value));
205 if (err)
206 pr_warn("Error %s SMN address 0x%x.\n",
207 (write ? "writing to" : "reading from"), address);
208
209out_unlock:
210 mutex_unlock(&smn_mutex);
211
212out:
213 return err;
214}
215
216int amd_smn_read(u16 node, u32 address, u32 *value)
217{
218 return __amd_smn_rw(node, address, value, false);
219}
220EXPORT_SYMBOL_GPL(amd_smn_read);
221
222int amd_smn_write(u16 node, u32 address, u32 value)
223{
224 return __amd_smn_rw(node, address, &value, true);
225}
226EXPORT_SYMBOL_GPL(amd_smn_write);
227
228
229static int amd_cache_northbridges(void)
230{
231 const struct pci_device_id *misc_ids = amd_nb_misc_ids;
232 const struct pci_device_id *link_ids = amd_nb_link_ids;
233 const struct pci_device_id *root_ids = amd_root_ids;
234 struct pci_dev *root, *misc, *link;
235 struct amd_northbridge *nb;
236 u16 roots_per_misc = 0;
237 u16 misc_count = 0;
238 u16 root_count = 0;
239 u16 i, j;
240
241 if (amd_northbridges.num)
242 return 0;
243
244 if (boot_cpu_data.x86_vendor == X86_VENDOR_HYGON) {
245 root_ids = hygon_root_ids;
246 misc_ids = hygon_nb_misc_ids;
247 link_ids = hygon_nb_link_ids;
248 }
249
250 misc = NULL;
251 while ((misc = next_northbridge(misc, misc_ids)))
252 misc_count++;
253
254 if (!misc_count)
255 return -ENODEV;
256
257 root = NULL;
258 while ((root = next_northbridge(root, root_ids)))
259 root_count++;
260
261 if (root_count) {
262 roots_per_misc = root_count / misc_count;
263
264 /*
265 * There should be _exactly_ N roots for each DF/SMN
266 * interface.
267 */
268 if (!roots_per_misc || (root_count % roots_per_misc)) {
269 pr_info("Unsupported AMD DF/PCI configuration found\n");
270 return -ENODEV;
271 }
272 }
273
274 nb = kcalloc(misc_count, sizeof(struct amd_northbridge), GFP_KERNEL);
275 if (!nb)
276 return -ENOMEM;
277
278 amd_northbridges.nb = nb;
279 amd_northbridges.num = misc_count;
280
281 link = misc = root = NULL;
282 for (i = 0; i < amd_northbridges.num; i++) {
283 node_to_amd_nb(i)->root = root =
284 next_northbridge(root, root_ids);
285 node_to_amd_nb(i)->misc = misc =
286 next_northbridge(misc, misc_ids);
287 node_to_amd_nb(i)->link = link =
288 next_northbridge(link, link_ids);
289
290 /*
291 * If there are more PCI root devices than data fabric/
292 * system management network interfaces, then the (N)
293 * PCI roots per DF/SMN interface are functionally the
294 * same (for DF/SMN access) and N-1 are redundant. N-1
295 * PCI roots should be skipped per DF/SMN interface so
296 * the following DF/SMN interfaces get mapped to
297 * correct PCI roots.
298 */
299 for (j = 1; j < roots_per_misc; j++)
300 root = next_northbridge(root, root_ids);
301 }
302
303 if (amd_gart_present())
304 amd_northbridges.flags |= AMD_NB_GART;
305
306 /*
307 * Check for L3 cache presence.
308 */
309 if (!cpuid_edx(0x80000006))
310 return 0;
311
312 /*
313 * Some CPU families support L3 Cache Index Disable. There are some
314 * limitations because of E382 and E388 on family 0x10.
315 */
316 if (boot_cpu_data.x86 == 0x10 &&
317 boot_cpu_data.x86_model >= 0x8 &&
318 (boot_cpu_data.x86_model > 0x9 ||
319 boot_cpu_data.x86_stepping >= 0x1))
320 amd_northbridges.flags |= AMD_NB_L3_INDEX_DISABLE;
321
322 if (boot_cpu_data.x86 == 0x15)
323 amd_northbridges.flags |= AMD_NB_L3_INDEX_DISABLE;
324
325 /* L3 cache partitioning is supported on family 0x15 */
326 if (boot_cpu_data.x86 == 0x15)
327 amd_northbridges.flags |= AMD_NB_L3_PARTITIONING;
328
329 return 0;
330}
331
332/*
333 * Ignores subdevice/subvendor but as far as I can figure out
334 * they're useless anyways
335 */
336bool __init early_is_amd_nb(u32 device)
337{
338 const struct pci_device_id *misc_ids = amd_nb_misc_ids;
339 const struct pci_device_id *id;
340 u32 vendor = device & 0xffff;
341
342 if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD &&
343 boot_cpu_data.x86_vendor != X86_VENDOR_HYGON)
344 return false;
345
346 if (boot_cpu_data.x86_vendor == X86_VENDOR_HYGON)
347 misc_ids = hygon_nb_misc_ids;
348
349 device >>= 16;
350 for (id = misc_ids; id->vendor; id++)
351 if (vendor == id->vendor && device == id->device)
352 return true;
353 return false;
354}
355
356struct resource *amd_get_mmconfig_range(struct resource *res)
357{
358 u32 address;
359 u64 base, msr;
360 unsigned int segn_busn_bits;
361
362 if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD &&
363 boot_cpu_data.x86_vendor != X86_VENDOR_HYGON)
364 return NULL;
365
366 /* assume all cpus from fam10h have mmconfig */
367 if (boot_cpu_data.x86 < 0x10)
368 return NULL;
369
370 address = MSR_FAM10H_MMIO_CONF_BASE;
371 rdmsrl(address, msr);
372
373 /* mmconfig is not enabled */
374 if (!(msr & FAM10H_MMIO_CONF_ENABLE))
375 return NULL;
376
377 base = msr & (FAM10H_MMIO_CONF_BASE_MASK<<FAM10H_MMIO_CONF_BASE_SHIFT);
378
379 segn_busn_bits = (msr >> FAM10H_MMIO_CONF_BUSRANGE_SHIFT) &
380 FAM10H_MMIO_CONF_BUSRANGE_MASK;
381
382 res->flags = IORESOURCE_MEM;
383 res->start = base;
384 res->end = base + (1ULL<<(segn_busn_bits + 20)) - 1;
385 return res;
386}
387
388int amd_get_subcaches(int cpu)
389{
390 struct pci_dev *link = node_to_amd_nb(topology_amd_node_id(cpu))->link;
391 unsigned int mask;
392
393 if (!amd_nb_has_feature(AMD_NB_L3_PARTITIONING))
394 return 0;
395
396 pci_read_config_dword(link, 0x1d4, &mask);
397
398 return (mask >> (4 * cpu_data(cpu).topo.core_id)) & 0xf;
399}
400
401int amd_set_subcaches(int cpu, unsigned long mask)
402{
403 static unsigned int reset, ban;
404 struct amd_northbridge *nb = node_to_amd_nb(topology_amd_node_id(cpu));
405 unsigned int reg;
406 int cuid;
407
408 if (!amd_nb_has_feature(AMD_NB_L3_PARTITIONING) || mask > 0xf)
409 return -EINVAL;
410
411 /* if necessary, collect reset state of L3 partitioning and BAN mode */
412 if (reset == 0) {
413 pci_read_config_dword(nb->link, 0x1d4, &reset);
414 pci_read_config_dword(nb->misc, 0x1b8, &ban);
415 ban &= 0x180000;
416 }
417
418 /* deactivate BAN mode if any subcaches are to be disabled */
419 if (mask != 0xf) {
420 pci_read_config_dword(nb->misc, 0x1b8, ®);
421 pci_write_config_dword(nb->misc, 0x1b8, reg & ~0x180000);
422 }
423
424 cuid = cpu_data(cpu).topo.core_id;
425 mask <<= 4 * cuid;
426 mask |= (0xf ^ (1 << cuid)) << 26;
427
428 pci_write_config_dword(nb->link, 0x1d4, mask);
429
430 /* reset BAN mode if L3 partitioning returned to reset state */
431 pci_read_config_dword(nb->link, 0x1d4, ®);
432 if (reg == reset) {
433 pci_read_config_dword(nb->misc, 0x1b8, ®);
434 reg &= ~0x180000;
435 pci_write_config_dword(nb->misc, 0x1b8, reg | ban);
436 }
437
438 return 0;
439}
440
441static void amd_cache_gart(void)
442{
443 u16 i;
444
445 if (!amd_nb_has_feature(AMD_NB_GART))
446 return;
447
448 flush_words = kmalloc_array(amd_northbridges.num, sizeof(u32), GFP_KERNEL);
449 if (!flush_words) {
450 amd_northbridges.flags &= ~AMD_NB_GART;
451 pr_notice("Cannot initialize GART flush words, GART support disabled\n");
452 return;
453 }
454
455 for (i = 0; i != amd_northbridges.num; i++)
456 pci_read_config_dword(node_to_amd_nb(i)->misc, 0x9c, &flush_words[i]);
457}
458
459void amd_flush_garts(void)
460{
461 int flushed, i;
462 unsigned long flags;
463 static DEFINE_SPINLOCK(gart_lock);
464
465 if (!amd_nb_has_feature(AMD_NB_GART))
466 return;
467
468 /*
469 * Avoid races between AGP and IOMMU. In theory it's not needed
470 * but I'm not sure if the hardware won't lose flush requests
471 * when another is pending. This whole thing is so expensive anyways
472 * that it doesn't matter to serialize more. -AK
473 */
474 spin_lock_irqsave(&gart_lock, flags);
475 flushed = 0;
476 for (i = 0; i < amd_northbridges.num; i++) {
477 pci_write_config_dword(node_to_amd_nb(i)->misc, 0x9c,
478 flush_words[i] | 1);
479 flushed++;
480 }
481 for (i = 0; i < amd_northbridges.num; i++) {
482 u32 w;
483 /* Make sure the hardware actually executed the flush*/
484 for (;;) {
485 pci_read_config_dword(node_to_amd_nb(i)->misc,
486 0x9c, &w);
487 if (!(w & 1))
488 break;
489 cpu_relax();
490 }
491 }
492 spin_unlock_irqrestore(&gart_lock, flags);
493 if (!flushed)
494 pr_notice("nothing to flush?\n");
495}
496EXPORT_SYMBOL_GPL(amd_flush_garts);
497
498static void __fix_erratum_688(void *info)
499{
500#define MSR_AMD64_IC_CFG 0xC0011021
501
502 msr_set_bit(MSR_AMD64_IC_CFG, 3);
503 msr_set_bit(MSR_AMD64_IC_CFG, 14);
504}
505
506/* Apply erratum 688 fix so machines without a BIOS fix work. */
507static __init void fix_erratum_688(void)
508{
509 struct pci_dev *F4;
510 u32 val;
511
512 if (boot_cpu_data.x86 != 0x14)
513 return;
514
515 if (!amd_northbridges.num)
516 return;
517
518 F4 = node_to_amd_nb(0)->link;
519 if (!F4)
520 return;
521
522 if (pci_read_config_dword(F4, 0x164, &val))
523 return;
524
525 if (val & BIT(2))
526 return;
527
528 on_each_cpu(__fix_erratum_688, NULL, 0);
529
530 pr_info("x86/cpu/AMD: CPU erratum 688 worked around\n");
531}
532
533static __init int init_amd_nbs(void)
534{
535 amd_cache_northbridges();
536 amd_cache_gart();
537
538 fix_erratum_688();
539
540 return 0;
541}
542
543/* This has to go after the PCI subsystem */
544fs_initcall(init_amd_nbs);