arch/x86/kernel/mmconf-fam10h_64.c

   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 __init 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 __initconst 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 /* Called from a __cpuinit function, but only on the BSP. */
 238 void __ref check_enable_amd_mmconf_dmi(void)
 239 {
 240         dmi_check_system(mmconf_dmi_table);
 241 }