1 /* 2 * AMD Family 10h mmconfig enablement 3 */ 4 5 #include <linux/types.h> 6 #include <linux/mm.h> 7 #include <linux/string.h> 8 #include <linux/pci.h> 9 #include <linux/dmi.h> 10 #include <linux/range.h> 11 12 #include <asm/pci-direct.h> 13 #include <linux/sort.h> 14 #include <asm/io.h> 15 #include <asm/msr.h> 16 #include <asm/acpi.h> 17 #include <asm/mmconfig.h> 18 #include <asm/pci_x86.h> 19 20 struct pci_hostbridge_probe { 21 u32 bus; 22 u32 slot; 23 u32 vendor; 24 u32 device; 25 }; 26 27 static u64 fam10h_pci_mmconf_base; 28 29 static struct pci_hostbridge_probe pci_probes[] = { 30 { 0, 0x18, PCI_VENDOR_ID_AMD, 0x1200 }, 31 { 0xff, 0, PCI_VENDOR_ID_AMD, 0x1200 }, 32 }; 33 34 static int cmp_range(const void *x1, const void *x2) 35 { 36 const struct range *r1 = x1; 37 const struct range *r2 = x2; 38 int start1, start2; 39 40 start1 = r1->start >> 32; 41 start2 = r2->start >> 32; 42 43 return start1 - start2; 44 } 45 46 #define MMCONF_UNIT (1ULL << FAM10H_MMIO_CONF_BASE_SHIFT) 47 #define MMCONF_MASK (~(MMCONF_UNIT - 1)) 48 #define MMCONF_SIZE (MMCONF_UNIT << 8) 49 /* need to avoid (0xfd<<32), (0xfe<<32), and (0xff<<32), ht used space */ 50 #define FAM10H_PCI_MMCONF_BASE (0xfcULL<<32) 51 #define BASE_VALID(b) ((b) + MMCONF_SIZE <= (0xfdULL<<32) || (b) >= (1ULL<<40)) 52 static void get_fam10h_pci_mmconf_base(void) 53 { 54 int i; 55 unsigned bus; 56 unsigned slot; 57 int found; 58 59 u64 val; 60 u32 address; 61 u64 tom2; 62 u64 base = FAM10H_PCI_MMCONF_BASE; 63 64 int hi_mmio_num; 65 struct range range[8]; 66 67 /* only try to get setting from BSP */ 68 if (fam10h_pci_mmconf_base) 69 return; 70 71 if (!early_pci_allowed()) 72 return; 73 74 found = 0; 75 for (i = 0; i < ARRAY_SIZE(pci_probes); i++) { 76 u32 id; 77 u16 device; 78 u16 vendor; 79 80 bus = pci_probes[i].bus; 81 slot = pci_probes[i].slot; 82 id = read_pci_config(bus, slot, 0, PCI_VENDOR_ID); 83 84 vendor = id & 0xffff; 85 device = (id>>16) & 0xffff; 86 if (pci_probes[i].vendor == vendor && 87 pci_probes[i].device == device) { 88 found = 1; 89 break; 90 } 91 } 92 93 if (!found) 94 return; 95 96 /* SYS_CFG */ 97 address = MSR_K8_SYSCFG; 98 rdmsrl(address, val); 99 100 /* TOP_MEM2 is not enabled? */ 101 if (!(val & (1<<21))) { 102 tom2 = 1ULL << 32; 103 } else { 104 /* TOP_MEM2 */ 105 address = MSR_K8_TOP_MEM2; 106 rdmsrl(address, val); 107 tom2 = max(val & 0xffffff800000ULL, 1ULL << 32); 108 } 109 110 if (base <= tom2) 111 base = (tom2 + 2 * MMCONF_UNIT - 1) & MMCONF_MASK; 112 113 /* 114 * need to check if the range is in the high mmio range that is 115 * above 4G 116 */ 117 hi_mmio_num = 0; 118 for (i = 0; i < 8; i++) { 119 u32 reg; 120 u64 start; 121 u64 end; 122 reg = read_pci_config(bus, slot, 1, 0x80 + (i << 3)); 123 if (!(reg & 3)) 124 continue; 125 126 start = (u64)(reg & 0xffffff00) << 8; /* 39:16 on 31:8*/ 127 reg = read_pci_config(bus, slot, 1, 0x84 + (i << 3)); 128 end = ((u64)(reg & 0xffffff00) << 8) | 0xffff; /* 39:16 on 31:8*/ 129 130 if (end < tom2) 131 continue; 132 133 range[hi_mmio_num].start = start; 134 range[hi_mmio_num].end = end; 135 hi_mmio_num++; 136 } 137 138 if (!hi_mmio_num) 139 goto out; 140 141 /* sort the range */ 142 sort(range, hi_mmio_num, sizeof(struct range), cmp_range, NULL); 143 144 if (range[hi_mmio_num - 1].end < base) 145 goto out; 146 if (range[0].start > base + MMCONF_SIZE) 147 goto out; 148 149 /* need to find one window */ 150 base = (range[0].start & MMCONF_MASK) - MMCONF_UNIT; 151 if ((base > tom2) && BASE_VALID(base)) 152 goto out; 153 base = (range[hi_mmio_num - 1].end + MMCONF_UNIT) & MMCONF_MASK; 154 if (BASE_VALID(base)) 155 goto out; 156 /* need to find window between ranges */ 157 for (i = 1; i < hi_mmio_num; i++) { 158 base = (range[i - 1].end + MMCONF_UNIT) & MMCONF_MASK; 159 val = range[i].start & MMCONF_MASK; 160 if (val >= base + MMCONF_SIZE && BASE_VALID(base)) 161 goto out; 162 } 163 return; 164 165 out: 166 fam10h_pci_mmconf_base = base; 167 } 168 169 void fam10h_check_enable_mmcfg(void) 170 { 171 u64 val; 172 u32 address; 173 174 if (!(pci_probe & PCI_CHECK_ENABLE_AMD_MMCONF)) 175 return; 176 177 address = MSR_FAM10H_MMIO_CONF_BASE; 178 rdmsrl(address, val); 179 180 /* try to make sure that AP's setting is identical to BSP setting */ 181 if (val & FAM10H_MMIO_CONF_ENABLE) { 182 unsigned busnbits; 183 busnbits = (val >> FAM10H_MMIO_CONF_BUSRANGE_SHIFT) & 184 FAM10H_MMIO_CONF_BUSRANGE_MASK; 185 186 /* only trust the one handle 256 buses, if acpi=off */ 187 if (!acpi_pci_disabled || busnbits >= 8) { 188 u64 base = val & MMCONF_MASK; 189 190 if (!fam10h_pci_mmconf_base) { 191 fam10h_pci_mmconf_base = base; 192 return; 193 } else if (fam10h_pci_mmconf_base == base) 194 return; 195 } 196 } 197 198 /* 199 * if it is not enabled, try to enable it and assume only one segment 200 * with 256 buses 201 */ 202 get_fam10h_pci_mmconf_base(); 203 if (!fam10h_pci_mmconf_base) { 204 pci_probe &= ~PCI_CHECK_ENABLE_AMD_MMCONF; 205 return; 206 } 207 208 printk(KERN_INFO "Enable MMCONFIG on AMD Family 10h\n"); 209 val &= ~((FAM10H_MMIO_CONF_BASE_MASK<<FAM10H_MMIO_CONF_BASE_SHIFT) | 210 (FAM10H_MMIO_CONF_BUSRANGE_MASK<<FAM10H_MMIO_CONF_BUSRANGE_SHIFT)); 211 val |= fam10h_pci_mmconf_base | (8 << FAM10H_MMIO_CONF_BUSRANGE_SHIFT) | 212 FAM10H_MMIO_CONF_ENABLE; 213 wrmsrl(address, val); 214 } 215 216 static int __init set_check_enable_amd_mmconf(const struct dmi_system_id *d) 217 { 218 pci_probe |= PCI_CHECK_ENABLE_AMD_MMCONF; 219 return 0; 220 } 221 222 static const struct dmi_system_id __initconst mmconf_dmi_table[] = { 223 { 224 .callback = set_check_enable_amd_mmconf, 225 .ident = "Sun Microsystems Machine", 226 .matches = { 227 DMI_MATCH(DMI_SYS_VENDOR, "Sun Microsystems"), 228 }, 229 }, 230 {} 231 }; 232 233 /* Called from a non __init function, but only on the BSP. */ 234 void __ref check_enable_amd_mmconf_dmi(void) 235 { 236 dmi_check_system(mmconf_dmi_table); 237 } 238