diff options
Diffstat (limited to 'arch/x86/kernel')
| -rw-r--r-- | arch/x86/kernel/apic/x2apic_uv_x.c | 30 |
1 files changed, 28 insertions, 2 deletions
diff --git a/arch/x86/kernel/apic/x2apic_uv_x.c b/arch/x86/kernel/apic/x2apic_uv_x.c index 656994ac4677..d02cc7e65e4d 100644 --- a/arch/x86/kernel/apic/x2apic_uv_x.c +++ b/arch/x86/kernel/apic/x2apic_uv_x.c @@ -42,6 +42,7 @@ DEFINE_PER_CPU(int, x2apic_extra_bits); static enum uv_system_type uv_system_type; +static bool uv_hubless_system; static u64 gru_start_paddr, gru_end_paddr; static u64 gru_dist_base, gru_first_node_paddr = -1LL, gru_last_node_paddr; static u64 gru_dist_lmask, gru_dist_umask; @@ -225,8 +226,14 @@ static int __init uv_acpi_madt_oem_check(char *oem_id, char *oem_table_id) int pnodeid; int uv_apic; - if (strncmp(oem_id, "SGI", 3) != 0) + if (strncmp(oem_id, "SGI", 3) != 0) { + if (strncmp(oem_id, "NSGI", 4) == 0) { + uv_hubless_system = true; + pr_info("UV: OEM IDs %s/%s, HUBLESS\n", + oem_id, oem_table_id); + } return 0; + } if (numa_off) { pr_err("UV: NUMA is off, disabling UV support\n"); @@ -300,6 +307,12 @@ int is_uv_system(void) } EXPORT_SYMBOL_GPL(is_uv_system); +int is_uv_hubless(void) +{ + return uv_hubless_system; +} +EXPORT_SYMBOL_GPL(is_uv_hubless); + void **__uv_hub_info_list; EXPORT_SYMBOL_GPL(__uv_hub_info_list); @@ -1353,7 +1366,7 @@ static void __init build_socket_tables(void) } } -void __init uv_system_init(void) +static void __init uv_system_init_hub(void) { struct uv_hub_info_s hub_info = {0}; int bytes, cpu, nodeid; @@ -1490,4 +1503,17 @@ void __init uv_system_init(void) reboot_type = BOOT_ACPI; } +/* + * There is a small amount of UV specific code needed to initialize a + * UV system that does not have a "UV HUB" (referred to as "hubless"). + */ +void __init uv_system_init(void) +{ + if (likely(!is_uv_system() && !is_uv_hubless())) + return; + + if (is_uv_system()) + uv_system_init_hub(); +} + apic_driver(apic_x2apic_uv_x); |