summaryrefslogtreecommitdiffstats
path: root/arch/x86/kernel/amd_nb.c
blob: dec8de4e1663fd6c99c2cfcbf18cd75d9551a9a0 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
/*
 * Shared support code for AMD K8 northbridges and derivates.
 * Copyright 2006 Andi Kleen, SUSE Labs. Subject to GPLv2.
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/types.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/errno.h>
#include <linux/module.h>
#include <linux/spinlock.h>
#include <asm/amd_nb.h>

static u32 *flush_words;

const struct pci_device_id amd_nb_misc_ids[] = {
	{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_K8_NB_MISC) },
	{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_10H_NB_MISC) },
	{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_15H_NB_F3) },
	{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_15H_M10H_F3) },
	{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_15H_M30H_NB_F3) },
	{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_16H_NB_F3) },
	{}
};
EXPORT_SYMBOL(amd_nb_misc_ids);

static const struct pci_device_id amd_nb_link_ids[] = {
	{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_15H_NB_F4) },
	{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_15H_M30H_NB_F4) },
	{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_16H_NB_F4) },
	{}
};

const struct amd_nb_bus_dev_range amd_nb_bus_dev_ranges[] __initconst = {
	{ 0x00, 0x18, 0x20 },
	{ 0xff, 0x00, 0x20 },
	{ 0xfe, 0x00, 0x20 },
	{ }
};

struct amd_northbridge_info amd_northbridges;
EXPORT_SYMBOL(amd_northbridges);

static struct pci_dev *next_northbridge(struct pci_dev *dev,
					const struct pci_device_id *ids)
{
	do {
		dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev);
		if (!dev)
			break;
	} while (!pci_match_id(ids, dev));
	return dev;
}

int amd_cache_northbridges(void)
{
	u16 i = 0;
	struct amd_northbridge *nb;
	struct pci_dev *misc, *link;

	if (amd_nb_num())
		return 0;

	misc = NULL;
	while ((misc = next_northbridge(misc, amd_nb_misc_ids)) != NULL)
		i++;

	if (i == 0)
		return 0;

	nb = kzalloc(i * sizeof(struct amd_northbridge), GFP_KERNEL);
	if (!nb)
		return -ENOMEM;

	amd_northbridges.nb = nb;
	amd_northbridges.num = i;

	link = misc = NULL;
	for (i = 0; i != amd_nb_num(); i++) {
		node_to_amd_nb(i)->misc = misc =
			next_northbridge(misc, amd_nb_misc_ids);
		node_to_amd_nb(i)->link = link =
			next_northbridge(link, amd_nb_link_ids);
	}

	/* GART present only on Fam15h upto model 0fh */
	if (boot_cpu_data.x86 == 0xf || boot_cpu_data.x86 == 0x10 ||
	    (boot_cpu_data.x86 == 0x15 && boot_cpu_data.x86_model < 0x10))
		amd_northbridges.flags |= AMD_NB_GART;

	/*
	 * Check for L3 cache presence.
	 */
	if (!cpuid_edx(0x80000006))
		return 0;

	/*
	 * Some CPU families support L3 Cache Index Disable. There are some
	 * limitations because of E382 and E388 on family 0x10.
	 */
	if (boot_cpu_data.x86 == 0x10 &&
	    boot_cpu_data.x86_model >= 0x8 &&
	    (boot_cpu_data.x86_model > 0x9 ||
	     boot_cpu_data.x86_mask >= 0x1))
		amd_northbridges.flags |= AMD_NB_L3_INDEX_DISABLE;

	if (boot_cpu_data.x86 == 0x15)
		amd_northbridges.flags |= AMD_NB_L3_INDEX_DISABLE;

	/* L3 cache partitioning is supported on family 0x15 */
	if (boot_cpu_data.x86 == 0x15)
		amd_northbridges.flags |= AMD_NB_L3_PARTITIONING;

	return 0;
}
EXPORT_SYMBOL_GPL(amd_cache_northbridges);

/*
 * Ignores subdevice/subvendor but as far as I can figure out
 * they're useless anyways
 */
bool __init early_is_amd_nb(u32 device)
{
	const struct pci_device_id *id;
	u32 vendor = device & 0xffff;

	device >>= 16;
	for (id = amd_nb_misc_ids; id->vendor; id++)
		if (vendor == id->vendor && device == id->device)
			return true;
	return false;
}

struct resource *amd_get_mmconfig_range(struct resource *res)
{
	u32 address;
	u64 base, msr;
	unsigned segn_busn_bits;

	if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD)
		return NULL;

	/* assume all cpus from fam10h have mmconfig */
        if (boot_cpu_data.x86 < 0x10)
		return NULL;

	address = MSR_FAM10H_MMIO_CONF_BASE;
	rdmsrl(address, msr);

	/* mmconfig is not enabled */
	if (!(msr & FAM10H_MMIO_CONF_ENABLE))
		return NULL;

	base = msr & (FAM10H_MMIO_CONF_BASE_MASK<<FAM10H_MMIO_CONF_BASE_SHIFT);

	segn_busn_bits = (msr >> FAM10H_MMIO_CONF_BUSRANGE_SHIFT) &
			 FAM10H_MMIO_CONF_BUSRANGE_MASK;

	res->flags = IORESOURCE_MEM;
	res->start = base;
	res->end = base + (1ULL<<(segn_busn_bits + 20)) - 1;
	return res;
}

int amd_get_subcaches(int cpu)
{
	struct pci_dev *link = node_to_amd_nb(amd_get_nb_id(cpu))->link;
	unsigned int mask;
	int cuid;

	if (!amd_nb_has_feature(AMD_NB_L3_PARTITIONING))
		return 0;

	pci_read_config_dword(link, 0x1d4, &mask);

	cuid = cpu_data(cpu).compute_unit_id;
	return (mask >> (4 * cuid)) & 0xf;
}

int amd_set_subcaches(int cpu, unsigned long mask)
{
	static unsigned int reset, ban;
	struct amd_northbridge *nb = node_to_amd_nb(amd_get_nb_id(cpu));
	unsigned int reg;
	int cuid;

	if (!amd_nb_has_feature(AMD_NB_L3_PARTITIONING) || mask > 0xf)
		return -EINVAL;

	/* if necessary, collect reset state of L3 partitioning and BAN mode */
	if (reset == 0) {
		pci_read_config_dword(nb->link, 0x1d4, &reset);
		pci_read_config_dword(nb->misc, 0x1b8, &ban);
		ban &= 0x180000;
	}

	/* deactivate BAN mode if any subcaches are to be disabled */
	if (mask != 0xf) {
		pci_read_config_dword(nb->misc, 0x1b8, &reg);
		pci_write_config_dword(nb->misc, 0x1b8, reg & ~0x180000);
	}

	cuid = cpu_data(cpu).compute_unit_id;
	mask <<= 4 * cuid;
	mask |= (0xf ^ (1 << cuid)) << 26;

	pci_write_config_dword(nb->link, 0x1d4, mask);

	/* reset BAN mode if L3 partitioning returned to reset state */
	pci_read_config_dword(nb->link, 0x1d4, &reg);
	if (reg == reset) {
		pci_read_config_dword(nb->misc, 0x1b8, &reg);
		reg &= ~0x180000;
		pci_write_config_dword(nb->misc, 0x1b8, reg | ban);
	}

	return 0;
}

static int amd_cache_gart(void)
{
	u16 i;

       if (!amd_nb_has_feature(AMD_NB_GART))
               return 0;

       flush_words = kmalloc(amd_nb_num() * sizeof(u32), GFP_KERNEL);
       if (!flush_words) {
               amd_northbridges.flags &= ~AMD_NB_GART;
               return -ENOMEM;
       }

       for (i = 0; i != amd_nb_num(); i++)
               pci_read_config_dword(node_to_amd_nb(i)->misc, 0x9c,
                                     &flush_words[i]);

       return 0;
}

void amd_flush_garts(void)
{
	int flushed, i;
	unsigned long flags;
	static DEFINE_SPINLOCK(gart_lock);

	if (!amd_nb_has_feature(AMD_NB_GART))
		return;

	/* Avoid races between AGP and IOMMU. In theory it's not needed
	   but I'm not sure if the hardware won't lose flush requests
	   when another is pending. This whole thing is so expensive anyways
	   that it doesn't matter to serialize more. -AK */
	spin_lock_irqsave(&gart_lock, flags);
	flushed = 0;
	for (i = 0; i < amd_nb_num(); i++) {
		pci_write_config_dword(node_to_amd_nb(i)->misc, 0x9c,
				       flush_words[i] | 1);
		flushed++;
	}
	for (i = 0; i < amd_nb_num(); i++) {
		u32 w;
		/* Make sure the hardware actually executed the flush*/
		for (;;) {
			pci_read_config_dword(node_to_amd_nb(i)->misc,
					      0x9c, &w);
			if (!(w & 1))
				break;
			cpu_relax();
		}
	}
	spin_unlock_irqrestore(&gart_lock, flags);
	if (!flushed)
		pr_notice("nothing to flush?\n");
}
EXPORT_SYMBOL_GPL(amd_flush_garts);

static __init int init_amd_nbs(void)
{
	int err = 0;

	err = amd_cache_northbridges();

	if (err < 0)
		pr_notice("Cannot enumerate AMD northbridges\n");

	if (amd_cache_gart() < 0)
		pr_notice("Cannot initialize GART flush words, GART support disabled\n");

	return err;
}

/* This has to go after the PCI subsystem */
fs_initcall(init_amd_nbs);