diff options
Diffstat (limited to 'kernel/arch/x86/kernel/mmconf-fam10h_64.c')
-rw-r--r-- | kernel/arch/x86/kernel/mmconf-fam10h_64.c | 237 |
1 files changed, 237 insertions, 0 deletions
diff --git a/kernel/arch/x86/kernel/mmconf-fam10h_64.c b/kernel/arch/x86/kernel/mmconf-fam10h_64.c new file mode 100644 index 000000000..f4c886d91 --- /dev/null +++ b/kernel/arch/x86/kernel/mmconf-fam10h_64.c @@ -0,0 +1,237 @@ +/* + * AMD Family 10h mmconfig enablement + */ + +#include <linux/types.h> +#include <linux/mm.h> +#include <linux/string.h> +#include <linux/pci.h> +#include <linux/dmi.h> +#include <linux/range.h> + +#include <asm/pci-direct.h> +#include <linux/sort.h> +#include <asm/io.h> +#include <asm/msr.h> +#include <asm/acpi.h> +#include <asm/mmconfig.h> +#include <asm/pci_x86.h> + +struct pci_hostbridge_probe { + u32 bus; + u32 slot; + u32 vendor; + u32 device; +}; + +static u64 fam10h_pci_mmconf_base; + +static struct pci_hostbridge_probe pci_probes[] = { + { 0, 0x18, PCI_VENDOR_ID_AMD, 0x1200 }, + { 0xff, 0, PCI_VENDOR_ID_AMD, 0x1200 }, +}; + +static int cmp_range(const void *x1, const void *x2) +{ + const struct range *r1 = x1; + const struct range *r2 = x2; + int start1, start2; + + start1 = r1->start >> 32; + start2 = r2->start >> 32; + + return start1 - start2; +} + +#define MMCONF_UNIT (1ULL << FAM10H_MMIO_CONF_BASE_SHIFT) +#define MMCONF_MASK (~(MMCONF_UNIT - 1)) +#define MMCONF_SIZE (MMCONF_UNIT << 8) +/* need to avoid (0xfd<<32), (0xfe<<32), and (0xff<<32), ht used space */ +#define FAM10H_PCI_MMCONF_BASE (0xfcULL<<32) +#define BASE_VALID(b) ((b) + MMCONF_SIZE <= (0xfdULL<<32) || (b) >= (1ULL<<40)) +static void get_fam10h_pci_mmconf_base(void) +{ + int i; + unsigned bus; + unsigned slot; + int found; + + u64 val; + u32 address; + u64 tom2; + u64 base = FAM10H_PCI_MMCONF_BASE; + + int hi_mmio_num; + struct range range[8]; + + /* only try to get setting from BSP */ + if (fam10h_pci_mmconf_base) + return; + + if (!early_pci_allowed()) + return; + + found = 0; + for (i = 0; i < ARRAY_SIZE(pci_probes); i++) { + u32 id; + u16 device; + u16 vendor; + + bus = pci_probes[i].bus; + slot = pci_probes[i].slot; + id = read_pci_config(bus, slot, 0, PCI_VENDOR_ID); + + vendor = id & 0xffff; + device = (id>>16) & 0xffff; + if (pci_probes[i].vendor == vendor && + pci_probes[i].device == device) { + found = 1; + break; + } + } + + if (!found) + return; + + /* SYS_CFG */ + address = MSR_K8_SYSCFG; + rdmsrl(address, val); + + /* TOP_MEM2 is not enabled? */ + if (!(val & (1<<21))) { + tom2 = 1ULL << 32; + } else { + /* TOP_MEM2 */ + address = MSR_K8_TOP_MEM2; + rdmsrl(address, val); + tom2 = max(val & 0xffffff800000ULL, 1ULL << 32); + } + + if (base <= tom2) + base = (tom2 + 2 * MMCONF_UNIT - 1) & MMCONF_MASK; + + /* + * need to check if the range is in the high mmio range that is + * above 4G + */ + hi_mmio_num = 0; + for (i = 0; i < 8; i++) { + u32 reg; + u64 start; + u64 end; + reg = read_pci_config(bus, slot, 1, 0x80 + (i << 3)); + if (!(reg & 3)) + continue; + + start = (u64)(reg & 0xffffff00) << 8; /* 39:16 on 31:8*/ + reg = read_pci_config(bus, slot, 1, 0x84 + (i << 3)); + end = ((u64)(reg & 0xffffff00) << 8) | 0xffff; /* 39:16 on 31:8*/ + + if (end < tom2) + continue; + + range[hi_mmio_num].start = start; + range[hi_mmio_num].end = end; + hi_mmio_num++; + } + + if (!hi_mmio_num) + goto out; + + /* sort the range */ + sort(range, hi_mmio_num, sizeof(struct range), cmp_range, NULL); + + if (range[hi_mmio_num - 1].end < base) + goto out; + if (range[0].start > base + MMCONF_SIZE) + goto out; + + /* need to find one window */ + base = (range[0].start & MMCONF_MASK) - MMCONF_UNIT; + if ((base > tom2) && BASE_VALID(base)) + goto out; + base = (range[hi_mmio_num - 1].end + MMCONF_UNIT) & MMCONF_MASK; + if (BASE_VALID(base)) + goto out; + /* need to find window between ranges */ + for (i = 1; i < hi_mmio_num; i++) { + base = (range[i - 1].end + MMCONF_UNIT) & MMCONF_MASK; + val = range[i].start & MMCONF_MASK; + if (val >= base + MMCONF_SIZE && BASE_VALID(base)) + goto out; + } + return; + +out: + fam10h_pci_mmconf_base = base; +} + +void fam10h_check_enable_mmcfg(void) +{ + u64 val; + u32 address; + + if (!(pci_probe & PCI_CHECK_ENABLE_AMD_MMCONF)) + return; + + address = MSR_FAM10H_MMIO_CONF_BASE; + rdmsrl(address, val); + + /* try to make sure that AP's setting is identical to BSP setting */ + if (val & FAM10H_MMIO_CONF_ENABLE) { + unsigned busnbits; + busnbits = (val >> FAM10H_MMIO_CONF_BUSRANGE_SHIFT) & + FAM10H_MMIO_CONF_BUSRANGE_MASK; + + /* only trust the one handle 256 buses, if acpi=off */ + if (!acpi_pci_disabled || busnbits >= 8) { + u64 base = val & MMCONF_MASK; + + if (!fam10h_pci_mmconf_base) { + fam10h_pci_mmconf_base = base; + return; + } else if (fam10h_pci_mmconf_base == base) + return; + } + } + + /* + * if it is not enabled, try to enable it and assume only one segment + * with 256 buses + */ + get_fam10h_pci_mmconf_base(); + if (!fam10h_pci_mmconf_base) { + pci_probe &= ~PCI_CHECK_ENABLE_AMD_MMCONF; + return; + } + + printk(KERN_INFO "Enable MMCONFIG on AMD Family 10h\n"); + val &= ~((FAM10H_MMIO_CONF_BASE_MASK<<FAM10H_MMIO_CONF_BASE_SHIFT) | + (FAM10H_MMIO_CONF_BUSRANGE_MASK<<FAM10H_MMIO_CONF_BUSRANGE_SHIFT)); + val |= fam10h_pci_mmconf_base | (8 << FAM10H_MMIO_CONF_BUSRANGE_SHIFT) | + FAM10H_MMIO_CONF_ENABLE; + wrmsrl(address, val); +} + +static int __init set_check_enable_amd_mmconf(const struct dmi_system_id *d) +{ + pci_probe |= PCI_CHECK_ENABLE_AMD_MMCONF; + return 0; +} + +static const struct dmi_system_id __initconst mmconf_dmi_table[] = { + { + .callback = set_check_enable_amd_mmconf, + .ident = "Sun Microsystems Machine", + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "Sun Microsystems"), + }, + }, + {} +}; + +/* Called from a non __init function, but only on the BSP. */ +void __ref check_enable_amd_mmconf_dmi(void) +{ + dmi_check_system(mmconf_dmi_table); +} |