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 __cpuinitdata fam10h_pci_mmconf_base; 28 static int __cpuinitdata fam10h_pci_mmconf_base_status; 29 30 static struct pci_hostbridge_probe pci_probes[] __cpuinitdata = { 31 { 0, 0x18, PCI_VENDOR_ID_AMD, 0x1200 }, 32 { 0xff, 0, PCI_VENDOR_ID_AMD, 0x1200 }, 33 }; 34 35 static int __cpuinit cmp_range(const void *x1, const void *x2) 36 { 37 const struct range *r1 = x1; 38 const struct range *r2 = x2; 39 int start1, start2; 40 41 start1 = r1->start >> 32; 42 start2 = r2->start >> 32; 43 44 return start1 - start2; 45 } 46 47 /*[47:0] */ 48 /* need to avoid (0xfd<<32) and (0xfe<<32), ht used space */ 49 #define FAM10H_PCI_MMCONF_BASE (0xfcULL<<32) 50 #define BASE_VALID(b) ((b != (0xfdULL << 32)) && (b != (0xfeULL << 32))) 51 static void __cpuinit get_fam10h_pci_mmconf_base(void) 52 { 53 int i; 54 unsigned bus; 55 unsigned slot; 56 int found; 57 58 u64 val; 59 u32 address; 60 u64 tom2; 61 u64 base = FAM10H_PCI_MMCONF_BASE; 62 63 int hi_mmio_num; 64 struct range range[8]; 65 66 /* only try to get setting from BSP */ 67 /* -1 or 1 */ 68 if (fam10h_pci_mmconf_base_status) 69 return; 70 71 if (!early_pci_allowed()) 72 goto fail; 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 goto fail; 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 = 0; 103 } else { 104 /* TOP_MEM2 */ 105 address = MSR_K8_TOP_MEM2; 106 rdmsrl(address, val); 107 tom2 = val & (0xffffULL<<32); 108 } 109 110 if (base <= tom2) 111 base = tom2 + (1ULL<<32); 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) << 8) & (0xffULL << 32); /* 39:16 on 31:8*/ 127 reg = read_pci_config(bus, slot, 1, 0x84 + (i << 3)); 128 end = (((u64)reg) << 8) & (0xffULL << 32); /* 39:16 on 31:8*/ 129 130 if (!end) 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) 147 goto out; 148 149 /* need to find one window */ 150 base = range[0].start - (1ULL << 32); 151 if ((base > tom2) && BASE_VALID(base)) 152 goto out; 153 base = range[hi_mmio_num - 1].end + (1ULL << 32); 154 if ((base > tom2) && BASE_VALID(base)) 155 goto out; 156 /* need to find window between ranges */ 157 if (hi_mmio_num > 1) 158 for (i = 0; i < hi_mmio_num - 1; i++) { 159 if (range[i + 1].start > (range[i].end + (1ULL << 32))) { 160 base = range[i].end + (1ULL << 32); 161 if ((base > tom2) && BASE_VALID(base)) 162 goto out; 163 } 164 } 165 166 fail: 167 fam10h_pci_mmconf_base_status = -1; 168 return; 169 out: 170 fam10h_pci_mmconf_base = base; 171 fam10h_pci_mmconf_base_status = 1; 172 } 173 174 void __cpuinit fam10h_check_enable_mmcfg(void) 175 { 176 u64 val; 177 u32 address; 178 179 if (!(pci_probe & PCI_CHECK_ENABLE_AMD_MMCONF)) 180 return; 181 182 address = MSR_FAM10H_MMIO_CONF_BASE; 183 rdmsrl(address, val); 184 185 /* try to make sure that AP's setting is identical to BSP setting */ 186 if (val & FAM10H_MMIO_CONF_ENABLE) { 187 unsigned busnbits; 188 busnbits = (val >> FAM10H_MMIO_CONF_BUSRANGE_SHIFT) & 189 FAM10H_MMIO_CONF_BUSRANGE_MASK; 190 191 /* only trust the one handle 256 buses, if acpi=off */ 192 if (!acpi_pci_disabled || busnbits >= 8) { 193 u64 base; 194 base = val & (0xffffULL << 32); 195 if (fam10h_pci_mmconf_base_status <= 0) { 196 fam10h_pci_mmconf_base = base; 197 fam10h_pci_mmconf_base_status = 1; 198 return; 199 } else if (fam10h_pci_mmconf_base == base) 200 return; 201 } 202 } 203 204 /* 205 * if it is not enabled, try to enable it and assume only one segment 206 * with 256 buses 207 */ 208 get_fam10h_pci_mmconf_base(); 209 if (fam10h_pci_mmconf_base_status <= 0) 210 return; 211 212 printk(KERN_INFO "Enable MMCONFIG on AMD Family 10h\n"); 213 val &= ~((FAM10H_MMIO_CONF_BASE_MASK<<FAM10H_MMIO_CONF_BASE_SHIFT) | 214 (FAM10H_MMIO_CONF_BUSRANGE_MASK<<FAM10H_MMIO_CONF_BUSRANGE_SHIFT)); 215 val |= fam10h_pci_mmconf_base | (8 << FAM10H_MMIO_CONF_BUSRANGE_SHIFT) | 216 FAM10H_MMIO_CONF_ENABLE; 217 wrmsrl(address, val); 218 } 219 220 static int __devinit set_check_enable_amd_mmconf(const struct dmi_system_id *d) 221 { 222 pci_probe |= PCI_CHECK_ENABLE_AMD_MMCONF; 223 return 0; 224 } 225 226 static const struct dmi_system_id __cpuinitconst mmconf_dmi_table[] = { 227 { 228 .callback = set_check_enable_amd_mmconf, 229 .ident = "Sun Microsystems Machine", 230 .matches = { 231 DMI_MATCH(DMI_SYS_VENDOR, "Sun Microsystems"), 232 }, 233 }, 234 {} 235 }; 236 237 void __cpuinit check_enable_amd_mmconf_dmi(void) 238 { 239 dmi_check_system(mmconf_dmi_table); 240 } 241