From 770d7c73953d468a71ab97cb67d5a6c4a6e25263 Mon Sep 17 00:00:00 2001 From: Aaron Durbin Date: Tue, 3 May 2016 17:49:57 -0500 Subject: cpu/x86/mp_init: reduce exposure of internal implementation With all users converted to using the mp_ops callbacks there's no need to expose that surface area. Therefore, keep it all within the mp_init compilation unit. Change-Id: Ia1cc5326c1fa5ffde86b90d805b8379f4e4f46cd Signed-off-by: Aaron Durbin Reviewed-on: https://review.coreboot.org/14598 Tested-by: build bot (Jenkins) Reviewed-by: Duncan Laurie Reviewed-by: Furquan Shaikh --- src/cpu/x86/mp_init.c | 78 +++++++++++++++++++++++++++++++++++++++++++++++++-- 1 file changed, 75 insertions(+), 3 deletions(-) (limited to 'src/cpu') diff --git a/src/cpu/x86/mp_init.c b/src/cpu/x86/mp_init.c index 362cda3bbd..b9084c789e 100644 --- a/src/cpu/x86/mp_init.c +++ b/src/cpu/x86/mp_init.c @@ -38,6 +38,57 @@ #include #define MAX_APIC_IDS 256 + +typedef void (*mp_callback_t)(void); + +/* + * A mp_flight_record details a sequence of calls for the APs to perform + * along with the BSP to coordinate sequencing. Each flight record either + * provides a barrier for each AP before calling the callback or the APs + * are allowed to perform the callback without waiting. Regardless, each + * record has the cpus_entered field incremented for each record. When + * the BSP observes that the cpus_entered matches the number of APs + * the bsp_call is called with bsp_arg and upon returning releases the + * barrier allowing the APs to make further progress. + * + * Note that ap_call() and bsp_call() can be NULL. In the NULL case the + * callback will just not be called. + */ +struct mp_flight_record { + atomic_t barrier; + atomic_t cpus_entered; + mp_callback_t ap_call; + mp_callback_t bsp_call; +} __attribute__((aligned(CACHELINE_SIZE))); + +#define _MP_FLIGHT_RECORD(barrier_, ap_func_, bsp_func_) \ + { \ + .barrier = ATOMIC_INIT(barrier_), \ + .cpus_entered = ATOMIC_INIT(0), \ + .ap_call = ap_func_, \ + .bsp_call = bsp_func_, \ + } + +#define MP_FR_BLOCK_APS(ap_func_, bsp_func_) \ + _MP_FLIGHT_RECORD(0, ap_func_, bsp_func_) + +#define MP_FR_NOBLOCK_APS(ap_func_, bsp_func_) \ + _MP_FLIGHT_RECORD(1, ap_func_, bsp_func_) + +/* The mp_params structure provides the arguments to the mp subsystem + * for bringing up APs. */ +struct mp_params { + int num_cpus; /* Total cpus include BSP */ + int parallel_microcode_load; + const void *microcode_pointer; + /* adjust_apic_id() is called for every potential apic id in the + * system up from 0 to CONFIG_MAX_CPUS. Return adjusted apic_id. */ + int (*adjust_apic_id)(int index, int apic_id); + /* Flight plan for APs and BSP. */ + struct mp_flight_record *flight_plan; + int num_records; +}; + /* This needs to match the layout in the .module_parametrs section. */ struct sipi_params { uint16_t gdtlimit; @@ -514,7 +565,26 @@ static void init_bsp(struct bus *cpu_bus) cpus[info->index].apic_id = cpu_path.apic.apic_id; } -int mp_init(struct bus *cpu_bus, struct mp_params *p) +/* + * mp_init() will set up the SIPI vector and bring up the APs according to + * mp_params. Each flight record will be executed according to the plan. Note + * that the MP infrastructure uses SMM default area without saving it. It's + * up to the chipset or mainboard to either e820 reserve this area or save this + * region prior to calling mp_init() and restoring it after mp_init returns. + * + * At the time mp_init() is called the MTRR MSRs are mirrored into APs then + * caching is enabled before running the flight plan. + * + * The MP initialization has the following properties: + * 1. APs are brought up in parallel. + * 2. The ordering of coreboot cpu number and APIC ids is not deterministic. + * Therefore, one cannot rely on this property or the order of devices in + * the device tree unless the chipset or mainboard know the APIC ids + * a priori. + * + * mp_init() returns < 0 on error, 0 on success. + */ +static int mp_init(struct bus *cpu_bus, struct mp_params *p) { int num_cpus; int num_aps; @@ -563,14 +633,16 @@ int mp_init(struct bus *cpu_bus, struct mp_params *p) return bsp_do_flight_plan(p); } -void mp_initialize_cpu(void) +/* Calls cpu_initialize(info->index) which calls the coreboot CPU drivers. */ +static void mp_initialize_cpu(void) { /* Call back into driver infrastructure for the AP initialization. */ struct cpu_info *info = cpu_info(); cpu_initialize(info->index); } -int mp_get_apic_id(int cpu_slot) +/* Returns apic id for coreboot cpu number or < 0 on failure. */ +static int mp_get_apic_id(int cpu_slot) { if (cpu_slot >= CONFIG_MAX_CPUS || cpu_slot < 0) return -1; -- cgit v1.2.3