From 74862b03b46a852662c1a30c859b985261ff5d5c Mon Sep 17 00:00:00 2001 From: "travis@sgi.com" Date: Wed, 25 Jan 2017 10:35:18 -0600 Subject: [PATCH] x86/platform/UV: Add Support for UV4 Hubless systems Add recognition and support for UV4 hubless systems. Signed-off-by: Mike Travis Reviewed-by: Russ Anderson Acked-by: Thomas Gleixner Acked-by: Dimitri Sivanich Cc: Linus Torvalds Cc: Peter Zijlstra Link: http://lkml.kernel.org/r/20170125163517.398537358@asylum.americas.sgi.com Signed-off-by: Ingo Molnar --- arch/x86/include/asm/uv/uv.h | 2 ++ arch/x86/kernel/apic/x2apic_uv_x.c | 30 ++++++++++++++++++++++++++++-- 2 files changed, 30 insertions(+), 2 deletions(-) diff --git a/arch/x86/include/asm/uv/uv.h b/arch/x86/include/asm/uv/uv.h index 062921ef34e9..6686820feae9 100644 --- a/arch/x86/include/asm/uv/uv.h +++ b/arch/x86/include/asm/uv/uv.h @@ -10,6 +10,7 @@ struct mm_struct; extern enum uv_system_type get_uv_system_type(void); extern int is_uv_system(void); +extern int is_uv_hubless(void); extern void uv_cpu_init(void); extern void uv_nmi_init(void); extern void uv_system_init(void); @@ -23,6 +24,7 @@ extern const struct cpumask *uv_flush_tlb_others(const struct cpumask *cpumask, static inline enum uv_system_type get_uv_system_type(void) { return UV_NONE; } static inline int is_uv_system(void) { return 0; } +static inline int is_uv_hubless(void) { return 0; } static inline void uv_cpu_init(void) { } static inline void uv_system_init(void) { } static inline const struct cpumask * 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); -- 2.20.1