mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-11-30 13:36:45 +07:00
61c4628b53
Split the FPU save area from the task struct. This allows easy migration of FPU context, and it's generally cleaner. It also allows the following two optimizations: 1) only allocate when the application actually uses FPU, so in the first lazy FPU trap. This could save memory for non-fpu using apps. Next patch does this lazy allocation. 2) allocate the right size for the actual cpu rather than 512 bytes always. Patches enabling xsave/xrstor support (coming shortly) will take advantage of this. Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com> Signed-off-by: Arjan van de Ven <arjan@linux.intel.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
187 lines
5.9 KiB
C
187 lines
5.9 KiB
C
/* thread_info.h: x86_64 low-level thread information
|
|
*
|
|
* Copyright (C) 2002 David Howells (dhowells@redhat.com)
|
|
* - Incorporating suggestions made by Linus Torvalds and Dave Miller
|
|
*/
|
|
|
|
#ifndef _ASM_THREAD_INFO_H
|
|
#define _ASM_THREAD_INFO_H
|
|
|
|
#ifdef __KERNEL__
|
|
|
|
#include <asm/page.h>
|
|
#include <asm/types.h>
|
|
#include <asm/pda.h>
|
|
|
|
/*
|
|
* low level task data that entry.S needs immediate access to
|
|
* - this struct should fit entirely inside of one cache line
|
|
* - this struct shares the supervisor stack pages
|
|
*/
|
|
#ifndef __ASSEMBLY__
|
|
struct task_struct;
|
|
struct exec_domain;
|
|
#include <asm/processor.h>
|
|
|
|
struct thread_info {
|
|
struct task_struct *task; /* main task structure */
|
|
struct exec_domain *exec_domain; /* execution domain */
|
|
__u32 flags; /* low level flags */
|
|
__u32 status; /* thread synchronous flags */
|
|
__u32 cpu; /* current CPU */
|
|
int preempt_count; /* 0 => preemptable,
|
|
<0 => BUG */
|
|
mm_segment_t addr_limit;
|
|
struct restart_block restart_block;
|
|
#ifdef CONFIG_IA32_EMULATION
|
|
void __user *sysenter_return;
|
|
#endif
|
|
};
|
|
#endif
|
|
|
|
/*
|
|
* macros/functions for gaining access to the thread information structure
|
|
* preempt_count needs to be 1 initially, until the scheduler is functional.
|
|
*/
|
|
#ifndef __ASSEMBLY__
|
|
#define INIT_THREAD_INFO(tsk) \
|
|
{ \
|
|
.task = &tsk, \
|
|
.exec_domain = &default_exec_domain, \
|
|
.flags = 0, \
|
|
.cpu = 0, \
|
|
.preempt_count = 1, \
|
|
.addr_limit = KERNEL_DS, \
|
|
.restart_block = { \
|
|
.fn = do_no_restart_syscall, \
|
|
}, \
|
|
}
|
|
|
|
#define init_thread_info (init_thread_union.thread_info)
|
|
#define init_stack (init_thread_union.stack)
|
|
|
|
static inline struct thread_info *current_thread_info(void)
|
|
{
|
|
struct thread_info *ti;
|
|
ti = (void *)(read_pda(kernelstack) + PDA_STACKOFFSET - THREAD_SIZE);
|
|
return ti;
|
|
}
|
|
|
|
/* do not use in interrupt context */
|
|
static inline struct thread_info *stack_thread_info(void)
|
|
{
|
|
struct thread_info *ti;
|
|
asm("andq %%rsp,%0; " : "=r" (ti) : "0" (~(THREAD_SIZE - 1)));
|
|
return ti;
|
|
}
|
|
|
|
/* thread information allocation */
|
|
#ifdef CONFIG_DEBUG_STACK_USAGE
|
|
#define THREAD_FLAGS (GFP_KERNEL | __GFP_ZERO)
|
|
#else
|
|
#define THREAD_FLAGS GFP_KERNEL
|
|
#endif
|
|
|
|
#define alloc_thread_info(tsk) \
|
|
((struct thread_info *)__get_free_pages(THREAD_FLAGS, THREAD_ORDER))
|
|
|
|
#else /* !__ASSEMBLY__ */
|
|
|
|
/* how to get the thread information struct from ASM */
|
|
#define GET_THREAD_INFO(reg) \
|
|
movq %gs:pda_kernelstack,reg ; \
|
|
subq $(THREAD_SIZE-PDA_STACKOFFSET),reg
|
|
|
|
#endif
|
|
|
|
/*
|
|
* thread information flags
|
|
* - these are process state flags that various assembly files
|
|
* may need to access
|
|
* - pending work-to-be-done flags are in LSW
|
|
* - other flags in MSW
|
|
* Warning: layout of LSW is hardcoded in entry.S
|
|
*/
|
|
#define TIF_SYSCALL_TRACE 0 /* syscall trace active */
|
|
#define TIF_SIGPENDING 2 /* signal pending */
|
|
#define TIF_NEED_RESCHED 3 /* rescheduling necessary */
|
|
#define TIF_SINGLESTEP 4 /* reenable singlestep on user return*/
|
|
#define TIF_IRET 5 /* force IRET */
|
|
#define TIF_SYSCALL_AUDIT 7 /* syscall auditing active */
|
|
#define TIF_SECCOMP 8 /* secure computing */
|
|
#define TIF_RESTORE_SIGMASK 9 /* restore signal mask in do_signal */
|
|
#define TIF_MCE_NOTIFY 10 /* notify userspace of an MCE */
|
|
#define TIF_HRTICK_RESCHED 11 /* reprogram hrtick timer */
|
|
/* 16 free */
|
|
#define TIF_IA32 17 /* 32bit process */
|
|
#define TIF_FORK 18 /* ret_from_fork */
|
|
#define TIF_ABI_PENDING 19
|
|
#define TIF_MEMDIE 20
|
|
#define TIF_DEBUG 21 /* uses debug registers */
|
|
#define TIF_IO_BITMAP 22 /* uses I/O bitmap */
|
|
#define TIF_FREEZE 23 /* is freezing for suspend */
|
|
#define TIF_FORCED_TF 24 /* true if TF in eflags artificially */
|
|
#define TIF_DEBUGCTLMSR 25 /* uses thread_struct.debugctlmsr */
|
|
#define TIF_DS_AREA_MSR 26 /* uses thread_struct.ds_area_msr */
|
|
#define TIF_BTS_TRACE_TS 27 /* record scheduling event timestamps */
|
|
#define TIF_NOTSC 28 /* TSC is not accessible in userland */
|
|
|
|
#define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE)
|
|
#define _TIF_SIGPENDING (1 << TIF_SIGPENDING)
|
|
#define _TIF_SINGLESTEP (1 << TIF_SINGLESTEP)
|
|
#define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED)
|
|
#define _TIF_IRET (1 << TIF_IRET)
|
|
#define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT)
|
|
#define _TIF_SECCOMP (1 << TIF_SECCOMP)
|
|
#define _TIF_RESTORE_SIGMASK (1 << TIF_RESTORE_SIGMASK)
|
|
#define _TIF_MCE_NOTIFY (1 << TIF_MCE_NOTIFY)
|
|
#define _TIF_HRTICK_RESCHED (1 << TIF_HRTICK_RESCHED)
|
|
#define _TIF_IA32 (1 << TIF_IA32)
|
|
#define _TIF_FORK (1 << TIF_FORK)
|
|
#define _TIF_ABI_PENDING (1 << TIF_ABI_PENDING)
|
|
#define _TIF_DEBUG (1 << TIF_DEBUG)
|
|
#define _TIF_IO_BITMAP (1 << TIF_IO_BITMAP)
|
|
#define _TIF_FREEZE (1 << TIF_FREEZE)
|
|
#define _TIF_FORCED_TF (1 << TIF_FORCED_TF)
|
|
#define _TIF_DEBUGCTLMSR (1 << TIF_DEBUGCTLMSR)
|
|
#define _TIF_DS_AREA_MSR (1 << TIF_DS_AREA_MSR)
|
|
#define _TIF_BTS_TRACE_TS (1 << TIF_BTS_TRACE_TS)
|
|
#define _TIF_NOTSC (1 << TIF_NOTSC)
|
|
|
|
/* work to do on interrupt/exception return */
|
|
#define _TIF_WORK_MASK \
|
|
(0x0000FFFF & \
|
|
~(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_SINGLESTEP|_TIF_SECCOMP))
|
|
/* work to do on any return to user space */
|
|
#define _TIF_ALLWORK_MASK (0x0000FFFF & ~_TIF_SECCOMP)
|
|
|
|
#define _TIF_DO_NOTIFY_MASK \
|
|
(_TIF_SIGPENDING|_TIF_SINGLESTEP|_TIF_MCE_NOTIFY|_TIF_HRTICK_RESCHED)
|
|
|
|
/* flags to check in __switch_to() */
|
|
#define _TIF_WORK_CTXSW \
|
|
(_TIF_IO_BITMAP|_TIF_DEBUGCTLMSR|_TIF_DS_AREA_MSR|_TIF_BTS_TRACE_TS|_TIF_NOTSC)
|
|
#define _TIF_WORK_CTXSW_PREV _TIF_WORK_CTXSW
|
|
#define _TIF_WORK_CTXSW_NEXT (_TIF_WORK_CTXSW|_TIF_DEBUG)
|
|
|
|
#define PREEMPT_ACTIVE 0x10000000
|
|
|
|
/*
|
|
* Thread-synchronous status.
|
|
*
|
|
* This is different from the flags in that nobody else
|
|
* ever touches our thread-synchronous status, so we don't
|
|
* have to worry about atomic accesses.
|
|
*/
|
|
#define TS_USEDFPU 0x0001 /* FPU was used by this task
|
|
this quantum (SMP) */
|
|
#define TS_COMPAT 0x0002 /* 32bit syscall active */
|
|
#define TS_POLLING 0x0004 /* true if in idle loop
|
|
and not sleeping */
|
|
|
|
#define tsk_is_polling(t) (task_thread_info(t)->status & TS_POLLING)
|
|
|
|
#endif /* __KERNEL__ */
|
|
|
|
#endif /* _ASM_THREAD_INFO_H */
|