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_16H_NB_F3) }, 24 {} 25 }; 26 EXPORT_SYMBOL(amd_nb_misc_ids); 27 28 static const struct pci_device_id amd_nb_link_ids[] = { 29 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_15H_NB_F4) }, 30 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_16H_NB_F4) }, 31 {} 32 }; 33 34 const struct amd_nb_bus_dev_range amd_nb_bus_dev_ranges[] __initconst = { 35 { 0x00, 0x18, 0x20 }, 36 { 0xff, 0x00, 0x20 }, 37 { 0xfe, 0x00, 0x20 }, 38 { } 39 }; 40 41 struct amd_northbridge_info amd_northbridges; 42 EXPORT_SYMBOL(amd_northbridges); 43 44 static struct pci_dev *next_northbridge(struct pci_dev *dev, 45 const struct pci_device_id *ids) 46 { 47 do { 48 dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev); 49 if (!dev) 50 break; 51 } while (!pci_match_id(ids, dev)); 52 return dev; 53 } 54 55 int amd_cache_northbridges(void) 56 { 57 u16 i = 0; 58 struct amd_northbridge *nb; 59 struct pci_dev *misc, *link; 60 61 if (amd_nb_num()) 62 return 0; 63 64 misc = NULL; 65 while ((misc = next_northbridge(misc, amd_nb_misc_ids)) != NULL) 66 i++; 67 68 if (i == 0) 69 return 0; 70 71 nb = kzalloc(i * sizeof(struct amd_northbridge), GFP_KERNEL); 72 if (!nb) 73 return -ENOMEM; 74 75 amd_northbridges.nb = nb; 76 amd_northbridges.num = i; 77 78 link = misc = NULL; 79 for (i = 0; i != amd_nb_num(); i++) { 80 node_to_amd_nb(i)->misc = misc = 81 next_northbridge(misc, amd_nb_misc_ids); 82 node_to_amd_nb(i)->link = link = 83 next_northbridge(link, amd_nb_link_ids); 84 } 85 86 if (boot_cpu_data.x86 == 0xf || boot_cpu_data.x86 == 0x10 || 87 boot_cpu_data.x86 == 0x15) 88 amd_northbridges.flags |= AMD_NB_GART; 89 90 /* 91 * Some CPU families support L3 Cache Index Disable. There are some 92 * limitations because of E382 and E388 on family 0x10. 93 */ 94 if (boot_cpu_data.x86 == 0x10 && 95 boot_cpu_data.x86_model >= 0x8 && 96 (boot_cpu_data.x86_model > 0x9 || 97 boot_cpu_data.x86_mask >= 0x1)) 98 amd_northbridges.flags |= AMD_NB_L3_INDEX_DISABLE; 99 100 if (boot_cpu_data.x86 == 0x15) 101 amd_northbridges.flags |= AMD_NB_L3_INDEX_DISABLE; 102 103 /* L3 cache partitioning is supported on family 0x15 */ 104 if (boot_cpu_data.x86 == 0x15) 105 amd_northbridges.flags |= AMD_NB_L3_PARTITIONING; 106 107 return 0; 108 } 109 EXPORT_SYMBOL_GPL(amd_cache_northbridges); 110 111 /* 112 * Ignores subdevice/subvendor but as far as I can figure out 113 * they're useless anyways 114 */ 115 bool __init early_is_amd_nb(u32 device) 116 { 117 const struct pci_device_id *id; 118 u32 vendor = device & 0xffff; 119 120 device >>= 16; 121 for (id = amd_nb_misc_ids; id->vendor; id++) 122 if (vendor == id->vendor && device == id->device) 123 return true; 124 return false; 125 } 126 127 struct resource *amd_get_mmconfig_range(struct resource *res) 128 { 129 u32 address; 130 u64 base, msr; 131 unsigned segn_busn_bits; 132 133 if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD) 134 return NULL; 135 136 /* assume all cpus from fam10h have mmconfig */ 137 if (boot_cpu_data.x86 < 0x10) 138 return NULL; 139 140 address = MSR_FAM10H_MMIO_CONF_BASE; 141 rdmsrl(address, msr); 142 143 /* mmconfig is not enabled */ 144 if (!(msr & FAM10H_MMIO_CONF_ENABLE)) 145 return NULL; 146 147 base = msr & (FAM10H_MMIO_CONF_BASE_MASK<<FAM10H_MMIO_CONF_BASE_SHIFT); 148 149 segn_busn_bits = (msr >> FAM10H_MMIO_CONF_BUSRANGE_SHIFT) & 150 FAM10H_MMIO_CONF_BUSRANGE_MASK; 151 152 res->flags = IORESOURCE_MEM; 153 res->start = base; 154 res->end = base + (1ULL<<(segn_busn_bits + 20)) - 1; 155 return res; 156 } 157 158 int amd_get_subcaches(int cpu) 159 { 160 struct pci_dev *link = node_to_amd_nb(amd_get_nb_id(cpu))->link; 161 unsigned int mask; 162 int cuid; 163 164 if (!amd_nb_has_feature(AMD_NB_L3_PARTITIONING)) 165 return 0; 166 167 pci_read_config_dword(link, 0x1d4, &mask); 168 169 cuid = cpu_data(cpu).compute_unit_id; 170 return (mask >> (4 * cuid)) & 0xf; 171 } 172 173 int amd_set_subcaches(int cpu, int mask) 174 { 175 static unsigned int reset, ban; 176 struct amd_northbridge *nb = node_to_amd_nb(amd_get_nb_id(cpu)); 177 unsigned int reg; 178 int cuid; 179 180 if (!amd_nb_has_feature(AMD_NB_L3_PARTITIONING) || mask > 0xf) 181 return -EINVAL; 182 183 /* if necessary, collect reset state of L3 partitioning and BAN mode */ 184 if (reset == 0) { 185 pci_read_config_dword(nb->link, 0x1d4, &reset); 186 pci_read_config_dword(nb->misc, 0x1b8, &ban); 187 ban &= 0x180000; 188 } 189 190 /* deactivate BAN mode if any subcaches are to be disabled */ 191 if (mask != 0xf) { 192 pci_read_config_dword(nb->misc, 0x1b8, ®); 193 pci_write_config_dword(nb->misc, 0x1b8, reg & ~0x180000); 194 } 195 196 cuid = cpu_data(cpu).compute_unit_id; 197 mask <<= 4 * cuid; 198 mask |= (0xf ^ (1 << cuid)) << 26; 199 200 pci_write_config_dword(nb->link, 0x1d4, mask); 201 202 /* reset BAN mode if L3 partitioning returned to reset state */ 203 pci_read_config_dword(nb->link, 0x1d4, ®); 204 if (reg == reset) { 205 pci_read_config_dword(nb->misc, 0x1b8, ®); 206 reg &= ~0x180000; 207 pci_write_config_dword(nb->misc, 0x1b8, reg | ban); 208 } 209 210 return 0; 211 } 212 213 static int amd_cache_gart(void) 214 { 215 u16 i; 216 217 if (!amd_nb_has_feature(AMD_NB_GART)) 218 return 0; 219 220 flush_words = kmalloc(amd_nb_num() * sizeof(u32), GFP_KERNEL); 221 if (!flush_words) { 222 amd_northbridges.flags &= ~AMD_NB_GART; 223 return -ENOMEM; 224 } 225 226 for (i = 0; i != amd_nb_num(); i++) 227 pci_read_config_dword(node_to_amd_nb(i)->misc, 0x9c, 228 &flush_words[i]); 229 230 return 0; 231 } 232 233 void amd_flush_garts(void) 234 { 235 int flushed, i; 236 unsigned long flags; 237 static DEFINE_SPINLOCK(gart_lock); 238 239 if (!amd_nb_has_feature(AMD_NB_GART)) 240 return; 241 242 /* Avoid races between AGP and IOMMU. In theory it's not needed 243 but I'm not sure if the hardware won't lose flush requests 244 when another is pending. This whole thing is so expensive anyways 245 that it doesn't matter to serialize more. -AK */ 246 spin_lock_irqsave(&gart_lock, flags); 247 flushed = 0; 248 for (i = 0; i < amd_nb_num(); i++) { 249 pci_write_config_dword(node_to_amd_nb(i)->misc, 0x9c, 250 flush_words[i] | 1); 251 flushed++; 252 } 253 for (i = 0; i < amd_nb_num(); i++) { 254 u32 w; 255 /* Make sure the hardware actually executed the flush*/ 256 for (;;) { 257 pci_read_config_dword(node_to_amd_nb(i)->misc, 258 0x9c, &w); 259 if (!(w & 1)) 260 break; 261 cpu_relax(); 262 } 263 } 264 spin_unlock_irqrestore(&gart_lock, flags); 265 if (!flushed) 266 pr_notice("nothing to flush?\n"); 267 } 268 EXPORT_SYMBOL_GPL(amd_flush_garts); 269 270 static __init int init_amd_nbs(void) 271 { 272 int err = 0; 273 274 err = amd_cache_northbridges(); 275 276 if (err < 0) 277 pr_notice("Cannot enumerate AMD northbridges\n"); 278 279 if (amd_cache_gart() < 0) 280 pr_notice("Cannot initialize GART flush words, GART support disabled\n"); 281 282 return err; 283 } 284 285 /* This has to go after the PCI subsystem */ 286 fs_initcall(init_amd_nbs); 287