kernel/arch/x86/kernel/amd_nb.c

   1 /*
   2  * Shared support code for AMD K8 northbridges and derivates.
   3  * Copyright 2006 Andi Kleen, SUSE Labs. Subject to GPLv2.
   4  */
   5
   6 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
   7
   8 #include <linux/types.h>
   9 #include <linux/slab.h>
  10 #include <linux/init.h>
  11 #include <linux/errno.h>
  12 #include <linux/module.h>
  13 #include <linux/spinlock.h>
  14 #include <asm/amd_nb.h>
  15
  16 static u32 *flush_words;
  17
  18 const struct pci_device_id amd_nb_misc_ids[] = {
  19         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_K8_NB_MISC) },
  20         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_10H_NB_MISC) },
  21         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_15H_NB_F3) },
  22         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_15H_M10H_F3) },
  23         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_15H_M30H_NB_F3) },
  24         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_15H_M60H_NB_F3) },
  25         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_16H_NB_F3) },
  26         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_16H_M30H_NB_F3) },
  27         {}
  28 };
  29 EXPORT_SYMBOL(amd_nb_misc_ids);
  30
  31 static const struct pci_device_id amd_nb_link_ids[] = {
  32         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_15H_NB_F4) },
  33         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_15H_M30H_NB_F4) },
  34         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_15H_M60H_NB_F4) },
  35         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_16H_NB_F4) },
  36         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_16H_M30H_NB_F4) },
  37         {}
  38 };
  39
  40 const struct amd_nb_bus_dev_range amd_nb_bus_dev_ranges[] __initconst = {
  41         { 0x00, 0x18, 0x20 },
  42         { 0xff, 0x00, 0x20 },
  43         { 0xfe, 0x00, 0x20 },
  44         { }
  45 };
  46
  47 struct amd_northbridge_info amd_northbridges;
  48 EXPORT_SYMBOL(amd_northbridges);
  49
  50 static struct pci_dev *next_northbridge(struct pci_dev *dev,
  51                                         const struct pci_device_id *ids)
  52 {
  53         do {
  54                 dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev);
  55                 if (!dev)
  56                         break;
  57         } while (!pci_match_id(ids, dev));
  58         return dev;
  59 }
  60
  61 int amd_cache_northbridges(void)
  62 {
  63         u16 i = 0;
  64         struct amd_northbridge *nb;
  65         struct pci_dev *misc, *link;
  66
  67         if (amd_nb_num())
  68                 return 0;
  69
  70         misc = NULL;
  71         while ((misc = next_northbridge(misc, amd_nb_misc_ids)) != NULL)
  72                 i++;
  73
  74         if (i == 0)
  75                 return 0;
  76
  77         nb = kzalloc(i * sizeof(struct amd_northbridge), GFP_KERNEL);
  78         if (!nb)
  79                 return -ENOMEM;
  80
  81         amd_northbridges.nb = nb;
  82         amd_northbridges.num = i;
  83
  84         link = misc = NULL;
  85         for (i = 0; i != amd_nb_num(); i++) {
  86                 node_to_amd_nb(i)->misc = misc =
  87                         next_northbridge(misc, amd_nb_misc_ids);
  88                 node_to_amd_nb(i)->link = link =
  89                         next_northbridge(link, amd_nb_link_ids);
  90         }
  91
  92         /* GART present only on Fam15h upto model 0fh */
  93         if (boot_cpu_data.x86 == 0xf || boot_cpu_data.x86 == 0x10 ||
  94             (boot_cpu_data.x86 == 0x15 && boot_cpu_data.x86_model < 0x10))
  95                 amd_northbridges.flags |= AMD_NB_GART;
  96
  97         /*
  98          * Check for L3 cache presence.
  99          */
 100         if (!cpuid_edx(0x80000006))
 101                 return 0;
 102
 103         /*
 104          * Some CPU families support L3 Cache Index Disable. There are some
 105          * limitations because of E382 and E388 on family 0x10.
 106          */
 107         if (boot_cpu_data.x86 == 0x10 &&
 108             boot_cpu_data.x86_model >= 0x8 &&
 109             (boot_cpu_data.x86_model > 0x9 ||
 110              boot_cpu_data.x86_mask >= 0x1))
 111                 amd_northbridges.flags |= AMD_NB_L3_INDEX_DISABLE;
 112
 113         if (boot_cpu_data.x86 == 0x15)
 114                 amd_northbridges.flags |= AMD_NB_L3_INDEX_DISABLE;
 115
 116         /* L3 cache partitioning is supported on family 0x15 */
 117         if (boot_cpu_data.x86 == 0x15)
 118                 amd_northbridges.flags |= AMD_NB_L3_PARTITIONING;
 119
 120         return 0;
 121 }
 122 EXPORT_SYMBOL_GPL(amd_cache_northbridges);
 123
 124 /*
 125  * Ignores subdevice/subvendor but as far as I can figure out
 126  * they're useless anyways
 127  */
 128 bool __init early_is_amd_nb(u32 device)
 129 {
 130         const struct pci_device_id *id;
 131         u32 vendor = device & 0xffff;
 132
 133         device >>= 16;
 134         for (id = amd_nb_misc_ids; id->vendor; id++)
 135                 if (vendor == id->vendor && device == id->device)
 136                         return true;
 137         return false;
 138 }
 139
 140 struct resource *amd_get_mmconfig_range(struct resource *res)
 141 {
 142         u32 address;
 143         u64 base, msr;
 144         unsigned segn_busn_bits;
 145
 146         if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD)
 147                 return NULL;
 148
 149         /* assume all cpus from fam10h have mmconfig */
 150         if (boot_cpu_data.x86 < 0x10)
 151                 return NULL;
 152
 153         address = MSR_FAM10H_MMIO_CONF_BASE;
 154         rdmsrl(address, msr);
 155
 156         /* mmconfig is not enabled */
 157         if (!(msr & FAM10H_MMIO_CONF_ENABLE))
 158                 return NULL;
 159
 160         base = msr & (FAM10H_MMIO_CONF_BASE_MASK<<FAM10H_MMIO_CONF_BASE_SHIFT);
 161
 162         segn_busn_bits = (msr >> FAM10H_MMIO_CONF_BUSRANGE_SHIFT) &
 163                          FAM10H_MMIO_CONF_BUSRANGE_MASK;
 164
 165         res->flags = IORESOURCE_MEM;
 166         res->start = base;
 167         res->end = base + (1ULL<<(segn_busn_bits + 20)) - 1;
 168         return res;
 169 }
 170
 171 int amd_get_subcaches(int cpu)
 172 {
 173         struct pci_dev *link = node_to_amd_nb(amd_get_nb_id(cpu))->link;
 174         unsigned int mask;
 175         int cuid;
 176
 177         if (!amd_nb_has_feature(AMD_NB_L3_PARTITIONING))
 178                 return 0;
 179
 180         pci_read_config_dword(link, 0x1d4, &mask);
 181
 182         cuid = cpu_data(cpu).compute_unit_id;
 183         return (mask >> (4 * cuid)) & 0xf;
 184 }
 185
 186 int amd_set_subcaches(int cpu, unsigned long mask)
 187 {
 188         static unsigned int reset, ban;
 189         struct amd_northbridge *nb = node_to_amd_nb(amd_get_nb_id(cpu));
 190         unsigned int reg;
 191         int cuid;
 192
 193         if (!amd_nb_has_feature(AMD_NB_L3_PARTITIONING) || mask > 0xf)
 194                 return -EINVAL;
 195
 196         /* if necessary, collect reset state of L3 partitioning and BAN mode */
 197         if (reset == 0) {
 198                 pci_read_config_dword(nb->link, 0x1d4, &reset);
 199                 pci_read_config_dword(nb->misc, 0x1b8, &ban);
 200                 ban &= 0x180000;
 201         }
 202
 203         /* deactivate BAN mode if any subcaches are to be disabled */
 204         if (mask != 0xf) {
 205                 pci_read_config_dword(nb->misc, 0x1b8, &reg);
 206                 pci_write_config_dword(nb->misc, 0x1b8, reg & ~0x180000);
 207         }
 208
 209         cuid = cpu_data(cpu).compute_unit_id;
 210         mask <<= 4 * cuid;
 211         mask |= (0xf ^ (1 << cuid)) << 26;
 212
 213         pci_write_config_dword(nb->link, 0x1d4, mask);
 214
 215         /* reset BAN mode if L3 partitioning returned to reset state */
 216         pci_read_config_dword(nb->link, 0x1d4, &reg);
 217         if (reg == reset) {
 218                 pci_read_config_dword(nb->misc, 0x1b8, &reg);
 219                 reg &= ~0x180000;
 220                 pci_write_config_dword(nb->misc, 0x1b8, reg | ban);
 221         }
 222
 223         return 0;
 224 }
 225
 226 static int amd_cache_gart(void)
 227 {
 228         u16 i;
 229
 230        if (!amd_nb_has_feature(AMD_NB_GART))
 231                return 0;
 232
 233        flush_words = kmalloc(amd_nb_num() * sizeof(u32), GFP_KERNEL);
 234        if (!flush_words) {
 235                amd_northbridges.flags &= ~AMD_NB_GART;
 236                return -ENOMEM;
 237        }
 238
 239        for (i = 0; i != amd_nb_num(); i++)
 240                pci_read_config_dword(node_to_amd_nb(i)->misc, 0x9c,
 241                                      &flush_words[i]);
 242
 243        return 0;
 244 }
 245
 246 void amd_flush_garts(void)
 247 {
 248         int flushed, i;
 249         unsigned long flags;
 250         static DEFINE_SPINLOCK(gart_lock);
 251
 252         if (!amd_nb_has_feature(AMD_NB_GART))
 253                 return;
 254
 255         /* Avoid races between AGP and IOMMU. In theory it's not needed
 256            but I'm not sure if the hardware won't lose flush requests
 257            when another is pending. This whole thing is so expensive anyways
 258            that it doesn't matter to serialize more. -AK */
 259         spin_lock_irqsave(&gart_lock, flags);
 260         flushed = 0;
 261         for (i = 0; i < amd_nb_num(); i++) {
 262                 pci_write_config_dword(node_to_amd_nb(i)->misc, 0x9c,
 263                                        flush_words[i] | 1);
 264                 flushed++;
 265         }
 266         for (i = 0; i < amd_nb_num(); i++) {
 267                 u32 w;
 268                 /* Make sure the hardware actually executed the flush*/
 269                 for (;;) {
 270                         pci_read_config_dword(node_to_amd_nb(i)->misc,
 271                                               0x9c, &w);
 272                         if (!(w & 1))
 273                                 break;
 274                         cpu_relax();
 275                 }
 276         }
 277         spin_unlock_irqrestore(&gart_lock, flags);
 278         if (!flushed)
 279                 pr_notice("nothing to flush?\n");
 280 }
 281 EXPORT_SYMBOL_GPL(amd_flush_garts);
 282
 283 static __init int init_amd_nbs(void)
 284 {
 285         int err = 0;
 286
 287         err = amd_cache_northbridges();
 288
 289         if (err < 0)
 290                 pr_notice("Cannot enumerate AMD northbridges\n");
 291
 292         if (amd_cache_gart() < 0)
 293                 pr_notice("Cannot initialize GART flush words, GART support disabled\n");
 294
 295         return err;
 296 }
 297
 298 /* This has to go after the PCI subsystem */
 299 fs_initcall(init_amd_nbs);