mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-15 17:36:57 +07:00
b8f3b15a7b
Since the enabling and disabling of IRQs within preempt_schedule_irq() is contained in a need_resched() loop, we don't need the outer arch code loop. Note that commita18815abcd("Use preempt_schedule_irq.") initially removed the existing loop, but missed the final branch to restore_all. Commitcdaed73afb("Fix preemption bug.") missed that and reintroduced the loop. Signed-off-by: Valentin Schneider <valentin.schneider@arm.com> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Paul Burton <paul.burton@mips.com> Cc: James Hogan <jhogan@kernel.org> Cc: linux-mips@vger.kernel.org Signed-off-by: Paul Burton <paul.burton@mips.com> Cc: linux-kernel@vger.kernel.org
187 lines
4.3 KiB
ArmAsm
187 lines
4.3 KiB
ArmAsm
/*
|
|
* This file is subject to the terms and conditions of the GNU General Public
|
|
* License. See the file "COPYING" in the main directory of this archive
|
|
* for more details.
|
|
*
|
|
* Copyright (C) 1994 - 2000, 2001, 2003 Ralf Baechle
|
|
* Copyright (C) 1999, 2000 Silicon Graphics, Inc.
|
|
* Copyright (C) 2001 MIPS Technologies, Inc.
|
|
*/
|
|
|
|
#include <asm/asm.h>
|
|
#include <asm/asmmacro.h>
|
|
#include <asm/compiler.h>
|
|
#include <asm/irqflags.h>
|
|
#include <asm/regdef.h>
|
|
#include <asm/mipsregs.h>
|
|
#include <asm/stackframe.h>
|
|
#include <asm/isadep.h>
|
|
#include <asm/thread_info.h>
|
|
#include <asm/war.h>
|
|
|
|
#ifndef CONFIG_PREEMPT
|
|
#define resume_kernel restore_all
|
|
#else
|
|
#define __ret_from_irq ret_from_exception
|
|
#endif
|
|
|
|
.text
|
|
.align 5
|
|
#ifndef CONFIG_PREEMPT
|
|
FEXPORT(ret_from_exception)
|
|
local_irq_disable # preempt stop
|
|
b __ret_from_irq
|
|
#endif
|
|
FEXPORT(ret_from_irq)
|
|
LONG_S s0, TI_REGS($28)
|
|
FEXPORT(__ret_from_irq)
|
|
/*
|
|
* We can be coming here from a syscall done in the kernel space,
|
|
* e.g. a failed kernel_execve().
|
|
*/
|
|
resume_userspace_check:
|
|
LONG_L t0, PT_STATUS(sp) # returning to kernel mode?
|
|
andi t0, t0, KU_USER
|
|
beqz t0, resume_kernel
|
|
|
|
resume_userspace:
|
|
local_irq_disable # make sure we dont miss an
|
|
# interrupt setting need_resched
|
|
# between sampling and return
|
|
LONG_L a2, TI_FLAGS($28) # current->work
|
|
andi t0, a2, _TIF_WORK_MASK # (ignoring syscall_trace)
|
|
bnez t0, work_pending
|
|
j restore_all
|
|
|
|
#ifdef CONFIG_PREEMPT
|
|
resume_kernel:
|
|
local_irq_disable
|
|
lw t0, TI_PRE_COUNT($28)
|
|
bnez t0, restore_all
|
|
LONG_L t0, TI_FLAGS($28)
|
|
andi t1, t0, _TIF_NEED_RESCHED
|
|
beqz t1, restore_all
|
|
LONG_L t0, PT_STATUS(sp) # Interrupts off?
|
|
andi t0, 1
|
|
beqz t0, restore_all
|
|
PTR_LA ra, restore_all
|
|
j preempt_schedule_irq
|
|
#endif
|
|
|
|
FEXPORT(ret_from_kernel_thread)
|
|
jal schedule_tail # a0 = struct task_struct *prev
|
|
move a0, s1
|
|
jal s0
|
|
j syscall_exit
|
|
|
|
FEXPORT(ret_from_fork)
|
|
jal schedule_tail # a0 = struct task_struct *prev
|
|
|
|
FEXPORT(syscall_exit)
|
|
#ifdef CONFIG_DEBUG_RSEQ
|
|
move a0, sp
|
|
jal rseq_syscall
|
|
#endif
|
|
local_irq_disable # make sure need_resched and
|
|
# signals dont change between
|
|
# sampling and return
|
|
LONG_L a2, TI_FLAGS($28) # current->work
|
|
li t0, _TIF_ALLWORK_MASK
|
|
and t0, a2, t0
|
|
bnez t0, syscall_exit_work
|
|
|
|
restore_all: # restore full frame
|
|
.set noat
|
|
RESTORE_TEMP
|
|
RESTORE_AT
|
|
RESTORE_STATIC
|
|
restore_partial: # restore partial frame
|
|
#ifdef CONFIG_TRACE_IRQFLAGS
|
|
SAVE_STATIC
|
|
SAVE_AT
|
|
SAVE_TEMP
|
|
LONG_L v0, PT_STATUS(sp)
|
|
#if defined(CONFIG_CPU_R3000) || defined(CONFIG_CPU_TX39XX)
|
|
and v0, ST0_IEP
|
|
#else
|
|
and v0, ST0_IE
|
|
#endif
|
|
beqz v0, 1f
|
|
jal trace_hardirqs_on
|
|
b 2f
|
|
1: jal trace_hardirqs_off
|
|
2:
|
|
RESTORE_TEMP
|
|
RESTORE_AT
|
|
RESTORE_STATIC
|
|
#endif
|
|
RESTORE_SOME
|
|
RESTORE_SP_AND_RET
|
|
.set at
|
|
|
|
work_pending:
|
|
andi t0, a2, _TIF_NEED_RESCHED # a2 is preloaded with TI_FLAGS
|
|
beqz t0, work_notifysig
|
|
work_resched:
|
|
TRACE_IRQS_OFF
|
|
jal schedule
|
|
|
|
local_irq_disable # make sure need_resched and
|
|
# signals dont change between
|
|
# sampling and return
|
|
LONG_L a2, TI_FLAGS($28)
|
|
andi t0, a2, _TIF_WORK_MASK # is there any work to be done
|
|
# other than syscall tracing?
|
|
beqz t0, restore_all
|
|
andi t0, a2, _TIF_NEED_RESCHED
|
|
bnez t0, work_resched
|
|
|
|
work_notifysig: # deal with pending signals and
|
|
# notify-resume requests
|
|
move a0, sp
|
|
li a1, 0
|
|
jal do_notify_resume # a2 already loaded
|
|
j resume_userspace_check
|
|
|
|
FEXPORT(syscall_exit_partial)
|
|
#ifdef CONFIG_DEBUG_RSEQ
|
|
move a0, sp
|
|
jal rseq_syscall
|
|
#endif
|
|
local_irq_disable # make sure need_resched doesn't
|
|
# change between and return
|
|
LONG_L a2, TI_FLAGS($28) # current->work
|
|
li t0, _TIF_ALLWORK_MASK
|
|
and t0, a2
|
|
beqz t0, restore_partial
|
|
SAVE_STATIC
|
|
syscall_exit_work:
|
|
LONG_L t0, PT_STATUS(sp) # returning to kernel mode?
|
|
andi t0, t0, KU_USER
|
|
beqz t0, resume_kernel
|
|
li t0, _TIF_WORK_SYSCALL_EXIT
|
|
and t0, a2 # a2 is preloaded with TI_FLAGS
|
|
beqz t0, work_pending # trace bit set?
|
|
local_irq_enable # could let syscall_trace_leave()
|
|
# call schedule() instead
|
|
TRACE_IRQS_ON
|
|
move a0, sp
|
|
jal syscall_trace_leave
|
|
b resume_userspace
|
|
|
|
#if defined(CONFIG_CPU_MIPSR2) || defined(CONFIG_CPU_MIPSR6) || \
|
|
defined(CONFIG_MIPS_MT)
|
|
|
|
/*
|
|
* MIPS32R2 Instruction Hazard Barrier - must be called
|
|
*
|
|
* For C code use the inline version named instruction_hazard().
|
|
*/
|
|
LEAF(mips_ihb)
|
|
.set MIPS_ISA_LEVEL_RAW
|
|
jr.hb ra
|
|
nop
|
|
END(mips_ihb)
|
|
|
|
#endif /* CONFIG_CPU_MIPSR2 or CONFIG_CPU_MIPSR6 or CONFIG_MIPS_MT */
|