mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-06 00:56:39 +07:00
7c3576d261
Currently x86 (similar to x84-64) has a special per-cpu structure called "i386_pda" which can be easily and efficiently referenced via the %fs register. An ELF section is more flexible than a structure, allowing any piece of code to use this area. Indeed, such a section already exists: the per-cpu area. So this patch: (1) Removes the PDA and uses per-cpu variables for each current member. (2) Replaces the __KERNEL_PDA segment with __KERNEL_PERCPU. (3) Creates a per-cpu mirror of __per_cpu_offset called this_cpu_off, which can be used to calculate addresses for this CPU's variables. (4) Simplifies startup, because %fs doesn't need to be loaded with a special segment at early boot; it can be deferred until the first percpu area is allocated (or never for UP). The result is less code and one less x86-specific concept. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com> Signed-off-by: Andi Kleen <ak@suse.de> Cc: Andi Kleen <ak@suse.de>
171 lines
3.9 KiB
C
171 lines
3.9 KiB
C
#ifndef __ASM_SMP_H
|
|
#define __ASM_SMP_H
|
|
|
|
/*
|
|
* We need the APIC definitions automatically as part of 'smp.h'
|
|
*/
|
|
#ifndef __ASSEMBLY__
|
|
#include <linux/kernel.h>
|
|
#include <linux/threads.h>
|
|
#include <linux/cpumask.h>
|
|
#endif
|
|
|
|
#if defined(CONFIG_X86_LOCAL_APIC) && !defined(__ASSEMBLY__)
|
|
#include <asm/bitops.h>
|
|
#include <asm/mpspec.h>
|
|
#include <asm/apic.h>
|
|
#ifdef CONFIG_X86_IO_APIC
|
|
#include <asm/io_apic.h>
|
|
#endif
|
|
#endif
|
|
|
|
#define BAD_APICID 0xFFu
|
|
#ifdef CONFIG_SMP
|
|
#ifndef __ASSEMBLY__
|
|
|
|
/*
|
|
* Private routines/data
|
|
*/
|
|
|
|
extern void smp_alloc_memory(void);
|
|
extern int pic_mode;
|
|
extern int smp_num_siblings;
|
|
extern cpumask_t cpu_sibling_map[];
|
|
extern cpumask_t cpu_core_map[];
|
|
|
|
extern void (*mtrr_hook) (void);
|
|
extern void zap_low_mappings (void);
|
|
extern void lock_ipi_call_lock(void);
|
|
extern void unlock_ipi_call_lock(void);
|
|
|
|
#define MAX_APICID 256
|
|
extern u8 x86_cpu_to_apicid[];
|
|
|
|
#define cpu_physical_id(cpu) x86_cpu_to_apicid[cpu]
|
|
|
|
#ifdef CONFIG_HOTPLUG_CPU
|
|
extern void cpu_exit_clear(void);
|
|
extern void cpu_uninit(void);
|
|
#endif
|
|
|
|
struct smp_ops
|
|
{
|
|
void (*smp_prepare_boot_cpu)(void);
|
|
void (*smp_prepare_cpus)(unsigned max_cpus);
|
|
int (*cpu_up)(unsigned cpu);
|
|
void (*smp_cpus_done)(unsigned max_cpus);
|
|
|
|
void (*smp_send_stop)(void);
|
|
void (*smp_send_reschedule)(int cpu);
|
|
int (*smp_call_function_mask)(cpumask_t mask,
|
|
void (*func)(void *info), void *info,
|
|
int wait);
|
|
};
|
|
|
|
extern struct smp_ops smp_ops;
|
|
|
|
static inline void smp_prepare_boot_cpu(void)
|
|
{
|
|
smp_ops.smp_prepare_boot_cpu();
|
|
}
|
|
static inline void smp_prepare_cpus(unsigned int max_cpus)
|
|
{
|
|
smp_ops.smp_prepare_cpus(max_cpus);
|
|
}
|
|
static inline int __cpu_up(unsigned int cpu)
|
|
{
|
|
return smp_ops.cpu_up(cpu);
|
|
}
|
|
static inline void smp_cpus_done(unsigned int max_cpus)
|
|
{
|
|
smp_ops.smp_cpus_done(max_cpus);
|
|
}
|
|
|
|
static inline void smp_send_stop(void)
|
|
{
|
|
smp_ops.smp_send_stop();
|
|
}
|
|
static inline void smp_send_reschedule(int cpu)
|
|
{
|
|
smp_ops.smp_send_reschedule(cpu);
|
|
}
|
|
static inline int smp_call_function_mask(cpumask_t mask,
|
|
void (*func) (void *info), void *info,
|
|
int wait)
|
|
{
|
|
return smp_ops.smp_call_function_mask(mask, func, info, wait);
|
|
}
|
|
|
|
void native_smp_prepare_boot_cpu(void);
|
|
void native_smp_prepare_cpus(unsigned int max_cpus);
|
|
int native_cpu_up(unsigned int cpunum);
|
|
void native_smp_cpus_done(unsigned int max_cpus);
|
|
|
|
#ifndef CONFIG_PARAVIRT
|
|
#define startup_ipi_hook(phys_apicid, start_eip, start_esp) \
|
|
do { } while (0)
|
|
#endif
|
|
|
|
/*
|
|
* This function is needed by all SMP systems. It must _always_ be valid
|
|
* from the initial startup. We map APIC_BASE very early in page_setup(),
|
|
* so this is correct in the x86 case.
|
|
*/
|
|
DECLARE_PER_CPU(int, cpu_number);
|
|
#define raw_smp_processor_id() (x86_read_percpu(cpu_number))
|
|
|
|
extern cpumask_t cpu_callout_map;
|
|
extern cpumask_t cpu_callin_map;
|
|
extern cpumask_t cpu_possible_map;
|
|
|
|
/* We don't mark CPUs online until __cpu_up(), so we need another measure */
|
|
static inline int num_booting_cpus(void)
|
|
{
|
|
return cpus_weight(cpu_callout_map);
|
|
}
|
|
|
|
#ifdef CONFIG_X86_LOCAL_APIC
|
|
|
|
#ifdef APIC_DEFINITION
|
|
extern int hard_smp_processor_id(void);
|
|
#else
|
|
#include <mach_apicdef.h>
|
|
static inline int hard_smp_processor_id(void)
|
|
{
|
|
/* we don't want to mark this access volatile - bad code generation */
|
|
return GET_APIC_ID(*(unsigned long *)(APIC_BASE+APIC_ID));
|
|
}
|
|
#endif
|
|
#endif
|
|
|
|
extern int safe_smp_processor_id(void);
|
|
extern int __cpu_disable(void);
|
|
extern void __cpu_die(unsigned int cpu);
|
|
extern unsigned int num_processors;
|
|
|
|
#endif /* !__ASSEMBLY__ */
|
|
|
|
#else /* CONFIG_SMP */
|
|
|
|
#define safe_smp_processor_id() 0
|
|
#define cpu_physical_id(cpu) boot_cpu_physical_apicid
|
|
|
|
#define NO_PROC_ID 0xFF /* No processor magic marker */
|
|
|
|
#endif
|
|
|
|
#ifndef __ASSEMBLY__
|
|
|
|
extern u8 apicid_2_node[];
|
|
|
|
#ifdef CONFIG_X86_LOCAL_APIC
|
|
static __inline int logical_smp_processor_id(void)
|
|
{
|
|
/* we don't want to mark this access volatile - bad code generation */
|
|
return GET_APIC_LOGICAL_ID(*(unsigned long *)(APIC_BASE+APIC_LDR));
|
|
}
|
|
#endif
|
|
#endif
|
|
|
|
#endif
|