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context_tracking: Split user tracking Kconfig

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Context tracking is going to be used not only to track user transitions
but also idle/IRQs/NMIs. The user tracking part will then become a
separate feature. Prepare Kconfig for that.

[ frederic: Apply Max Filippov feedback. ]

Signed-off-by: Frederic Weisbecker <frederic@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Neeraj Upadhyay <quic_neeraju@quicinc.com>
Cc: Uladzislau Rezki <uladzislau.rezki@sony.com>
Cc: Joel Fernandes <joel@joelfernandes.org>
Cc: Boqun Feng <boqun.feng@gmail.com>
Cc: Nicolas Saenz Julienne <nsaenz@kernel.org>
Cc: Marcelo Tosatti <mtosatti@redhat.com>
Cc: Xiongfeng Wang <wangxiongfeng2@huawei.com>
Cc: Yu Liao <liaoyu15@huawei.com>
Cc: Phil Auld <pauld@redhat.com>
Cc: Paul Gortmaker<paul.gortmaker@windriver.com>
Cc: Alex Belits <abelits@marvell.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Reviewed-by: Nicolas Saenz Julienne <nsaenzju@redhat.com>
Tested-by: Nicolas Saenz Julienne <nsaenzju@redhat.com>
This commit is contained in:
Frederic Weisbecker
2022-06-08 16:40:24 +02:00
committed by Paul E. McKenney
parent 2a0aafce96
commit 24a9c54182
25 changed files with 65 additions and 52 deletions
Download Patch File Download Diff File Expand all files Collapse all files

6
Documentation/features/time/context-tracking/arch-support.txt
View File

@@ -1,7 +1,7 @@
#
# Feature name: context-tracking
# Kconfig: HAVE_CONTEXT_TRACKING
# description: arch supports context tracking for NO_HZ_FULL
# Feature name: user-context-tracking
# Kconfig: HAVE_CONTEXT_TRACKING_USER
# description: arch supports user context tracking for NO_HZ_FULL
#
-----------------------
| arch |status|

4
arch/Kconfig
View File

@@ -774,7 +774,7 @@ config HAVE_ARCH_WITHIN_STACK_FRAMES
and similar) by implementing an inline arch_within_stack_frames(),
which is used by CONFIG_HARDENED_USERCOPY.
config HAVE_CONTEXT_TRACKING
config HAVE_CONTEXT_TRACKING_USER
bool
help
Provide kernel/user boundaries probes necessary for subsystems
@@ -785,7 +785,7 @@ config HAVE_CONTEXT_TRACKING
protected inside rcu_irq_enter/rcu_irq_exit() but preemption or signal
handling on irq exit still need to be protected.
config HAVE_CONTEXT_TRACKING_OFFSTACK
config HAVE_CONTEXT_TRACKING_USER_OFFSTACK
bool
help
Architecture neither relies on exception_enter()/exception_exit()

2
arch/arm/Kconfig
View File

@@ -84,7 +84,7 @@ config ARM
select HAVE_ARCH_TRANSPARENT_HUGEPAGE if ARM_LPAE
select HAVE_ARM_SMCCC if CPU_V7
select HAVE_EBPF_JIT if !CPU_ENDIAN_BE32
select HAVE_CONTEXT_TRACKING
select HAVE_CONTEXT_TRACKING_USER
select HAVE_C_RECORDMCOUNT
select HAVE_BUILDTIME_MCOUNT_SORT
select HAVE_DEBUG_KMEMLEAK if !XIP_KERNEL

4
arch/arm/kernel/entry-common.S
View File

@@ -28,7 +28,7 @@
#include "entry-header.S"
saved_psr .req r8
#if defined(CONFIG_TRACE_IRQFLAGS) || defined(CONFIG_CONTEXT_TRACKING)
#if defined(CONFIG_TRACE_IRQFLAGS) || defined(CONFIG_CONTEXT_TRACKING_USER)
saved_pc .req r9
#define TRACE(x...) x
#else
@@ -38,7 +38,7 @@ saved_pc .req lr
.section .entry.text,"ax",%progbits
.align 5
#if !(IS_ENABLED(CONFIG_TRACE_IRQFLAGS) || IS_ENABLED(CONFIG_CONTEXT_TRACKING) || \
#if !(IS_ENABLED(CONFIG_TRACE_IRQFLAGS) || IS_ENABLED(CONFIG_CONTEXT_TRACKING_USER) || \
IS_ENABLED(CONFIG_DEBUG_RSEQ))
/*
* This is the fast syscall return path. We do as little as possible here,

4
arch/arm/kernel/entry-header.S
View File

@@ -366,7 +366,7 @@ ALT_UP_B(.L1_\@)
* between user and kernel mode.
*/
.macro ct_user_exit, save = 1
#ifdef CONFIG_CONTEXT_TRACKING
#ifdef CONFIG_CONTEXT_TRACKING_USER
.if \save
stmdb sp!, {r0-r3, ip, lr}
bl user_exit_callable
@@ -378,7 +378,7 @@ ALT_UP_B(.L1_\@)
.endm
.macro ct_user_enter, save = 1
#ifdef CONFIG_CONTEXT_TRACKING
#ifdef CONFIG_CONTEXT_TRACKING_USER
.if \save
stmdb sp!, {r0-r3, ip, lr}
bl user_enter_callable

2
arch/arm64/Kconfig
View File

@@ -174,7 +174,7 @@ config ARM64
select HAVE_C_RECORDMCOUNT
select HAVE_CMPXCHG_DOUBLE
select HAVE_CMPXCHG_LOCAL
select HAVE_CONTEXT_TRACKING
select HAVE_CONTEXT_TRACKING_USER
select HAVE_DEBUG_KMEMLEAK
select HAVE_DMA_CONTIGUOUS
select HAVE_DYNAMIC_FTRACE

2
arch/csky/Kconfig
View File

@@ -42,7 +42,7 @@ config CSKY
select HAVE_ARCH_AUDITSYSCALL
select HAVE_ARCH_MMAP_RND_BITS
select HAVE_ARCH_SECCOMP_FILTER
select HAVE_CONTEXT_TRACKING
select HAVE_CONTEXT_TRACKING_USER
select HAVE_VIRT_CPU_ACCOUNTING_GEN
select HAVE_DEBUG_BUGVERBOSE
select HAVE_DEBUG_KMEMLEAK

4
arch/csky/kernel/entry.S
View File

@@ -19,7 +19,7 @@
.endm
.macro context_tracking
#ifdef CONFIG_CONTEXT_TRACKING
#ifdef CONFIG_CONTEXT_TRACKING_USER
mfcr a0, epsr
btsti a0, 31
bt 1f
@@ -159,7 +159,7 @@ ret_from_exception:
and r10, r9
cmpnei r10, 0
bt exit_work
#ifdef CONFIG_CONTEXT_TRACKING
#ifdef CONFIG_CONTEXT_TRACKING_USER
jbsr user_enter_callable
#endif
1:

2
arch/loongarch/Kconfig
View File

@@ -76,7 +76,7 @@ config LOONGARCH
select HAVE_ARCH_TRACEHOOK
select HAVE_ARCH_TRANSPARENT_HUGEPAGE
select HAVE_ASM_MODVERSIONS
select HAVE_CONTEXT_TRACKING
select HAVE_CONTEXT_TRACKING_USER
select HAVE_COPY_THREAD_TLS
select HAVE_DEBUG_STACKOVERFLOW
select HAVE_DMA_CONTIGUOUS

2
arch/mips/Kconfig
View File

@@ -56,7 +56,7 @@ config MIPS
select HAVE_ARCH_TRACEHOOK
select HAVE_ARCH_TRANSPARENT_HUGEPAGE if CPU_SUPPORTS_HUGEPAGES
select HAVE_ASM_MODVERSIONS
select HAVE_CONTEXT_TRACKING
select HAVE_CONTEXT_TRACKING_USER
select HAVE_TIF_NOHZ
select HAVE_C_RECORDMCOUNT
select HAVE_DEBUG_KMEMLEAK

2
arch/powerpc/Kconfig
View File

@@ -202,7 +202,7 @@ config PPC
select HAVE_ARCH_SECCOMP_FILTER
select HAVE_ARCH_TRACEHOOK
select HAVE_ASM_MODVERSIONS
select HAVE_CONTEXT_TRACKING if PPC64
select HAVE_CONTEXT_TRACKING_USER if PPC64
select HAVE_C_RECORDMCOUNT
select HAVE_DEBUG_KMEMLEAK
select HAVE_DEBUG_STACKOVERFLOW

2
arch/powerpc/include/asm/context_tracking.h
View File

@@ -2,7 +2,7 @@
#ifndef _ASM_POWERPC_CONTEXT_TRACKING_H
#define _ASM_POWERPC_CONTEXT_TRACKING_H
#ifdef CONFIG_CONTEXT_TRACKING
#ifdef CONFIG_CONTEXT_TRACKING_USER
#define SCHEDULE_USER bl schedule_user
#else
#define SCHEDULE_USER bl schedule

2
arch/riscv/Kconfig
View File

@@ -86,7 +86,7 @@ config RISCV
select HAVE_ARCH_THREAD_STRUCT_WHITELIST
select HAVE_ARCH_VMAP_STACK if MMU && 64BIT
select HAVE_ASM_MODVERSIONS
select HAVE_CONTEXT_TRACKING
select HAVE_CONTEXT_TRACKING_USER
select HAVE_DEBUG_KMEMLEAK
select HAVE_DMA_CONTIGUOUS if MMU
select HAVE_EBPF_JIT if MMU

6
arch/riscv/kernel/entry.S
View File

@@ -111,7 +111,7 @@ _save_context:
call __trace_hardirqs_off
#endif
#ifdef CONFIG_CONTEXT_TRACKING
#ifdef CONFIG_CONTEXT_TRACKING_USER
/* If previous state is in user mode, call user_exit_callable(). */
li a0, SR_PP
and a0, s1, a0
@@ -176,7 +176,7 @@ handle_syscall:
*/
csrs CSR_STATUS, SR_IE
#endif
#if defined(CONFIG_TRACE_IRQFLAGS) || defined(CONFIG_CONTEXT_TRACKING)
#if defined(CONFIG_TRACE_IRQFLAGS) || defined(CONFIG_CONTEXT_TRACKING_USER)
/* Recover a0 - a7 for system calls */
REG_L a0, PT_A0(sp)
REG_L a1, PT_A1(sp)
@@ -269,7 +269,7 @@ resume_userspace:
andi s1, s0, _TIF_WORK_MASK
bnez s1, work_pending
#ifdef CONFIG_CONTEXT_TRACKING
#ifdef CONFIG_CONTEXT_TRACKING_USER
call user_enter_callable
#endif

2
arch/sparc/Kconfig
View File

@@ -71,7 +71,7 @@ config SPARC64
select HAVE_DYNAMIC_FTRACE
select HAVE_FTRACE_MCOUNT_RECORD
select HAVE_SYSCALL_TRACEPOINTS
select HAVE_CONTEXT_TRACKING
select HAVE_CONTEXT_TRACKING_USER
select HAVE_TIF_NOHZ
select HAVE_DEBUG_KMEMLEAK
select IOMMU_HELPER

2
arch/sparc/kernel/rtrap_64.S
View File

@@ -15,7 +15,7 @@
#include <asm/visasm.h>
#include <asm/processor.h>
#ifdef CONFIG_CONTEXT_TRACKING
#ifdef CONFIG_CONTEXT_TRACKING_USER
# define SCHEDULE_USER schedule_user
#else
# define SCHEDULE_USER schedule

4
arch/x86/Kconfig
View File

@@ -186,8 +186,8 @@ config X86
select HAVE_ASM_MODVERSIONS
select HAVE_CMPXCHG_DOUBLE
select HAVE_CMPXCHG_LOCAL
select HAVE_CONTEXT_TRACKING if X86_64
select HAVE_CONTEXT_TRACKING_OFFSTACK if HAVE_CONTEXT_TRACKING
select HAVE_CONTEXT_TRACKING_USER if X86_64
select HAVE_CONTEXT_TRACKING_USER_OFFSTACK if HAVE_CONTEXT_TRACKING_USER
select HAVE_C_RECORDMCOUNT
select HAVE_OBJTOOL_MCOUNT if HAVE_OBJTOOL
select HAVE_BUILDTIME_MCOUNT_SORT

2
arch/xtensa/Kconfig
View File

@@ -33,7 +33,7 @@ config XTENSA
select HAVE_ARCH_KCSAN
select HAVE_ARCH_SECCOMP_FILTER
select HAVE_ARCH_TRACEHOOK
select HAVE_CONTEXT_TRACKING
select HAVE_CONTEXT_TRACKING_USER
select HAVE_DEBUG_KMEMLEAK
select HAVE_DMA_CONTIGUOUS
select HAVE_EXIT_THREAD

4
arch/xtensa/kernel/entry.S
View File

@@ -455,7 +455,7 @@ KABI_W or a3, a3, a2
abi_call trace_hardirqs_off
1:
#endif
#ifdef CONFIG_CONTEXT_TRACKING
#ifdef CONFIG_CONTEXT_TRACKING_USER
l32i abi_tmp0, a1, PT_PS
bbci.l abi_tmp0, PS_UM_BIT, 1f
abi_call user_exit_callable
@@ -544,7 +544,7 @@ common_exception_return:
j .Lrestore_state
.Lexit_tif_loop_user:
#ifdef CONFIG_CONTEXT_TRACKING
#ifdef CONFIG_CONTEXT_TRACKING_USER
abi_call user_enter_callable
#endif
#ifdef CONFIG_HAVE_HW_BREAKPOINT

12
include/linux/context_tracking.h
View File

@@ -10,7 +10,7 @@
#include <asm/ptrace.h>
#ifdef CONFIG_CONTEXT_TRACKING
#ifdef CONFIG_CONTEXT_TRACKING_USER
extern void ct_cpu_track_user(int cpu);
/* Called with interrupts disabled. */
@@ -52,7 +52,7 @@ static inline enum ctx_state exception_enter(void)
{
enum ctx_state prev_ctx;
if (IS_ENABLED(CONFIG_HAVE_CONTEXT_TRACKING_OFFSTACK) ||
if (IS_ENABLED(CONFIG_HAVE_CONTEXT_TRACKING_USER_OFFSTACK) ||
!context_tracking_enabled())
return 0;
@@ -65,7 +65,7 @@ static inline enum ctx_state exception_enter(void)
static inline void exception_exit(enum ctx_state prev_ctx)
{
if (!IS_ENABLED(CONFIG_HAVE_CONTEXT_TRACKING_OFFSTACK) &&
if (!IS_ENABLED(CONFIG_HAVE_CONTEXT_TRACKING_USER_OFFSTACK) &&
context_tracking_enabled()) {
if (prev_ctx != CONTEXT_KERNEL)
ct_user_enter(prev_ctx);
@@ -109,14 +109,14 @@ static inline enum ctx_state ct_state(void) { return CONTEXT_DISABLED; }
static __always_inline bool context_tracking_guest_enter(void) { return false; }
static inline void context_tracking_guest_exit(void) { }
#endif /* !CONFIG_CONTEXT_TRACKING */
#endif /* !CONFIG_CONTEXT_TRACKING_USER */
#define CT_WARN_ON(cond) WARN_ON(context_tracking_enabled() && (cond))
#ifdef CONFIG_CONTEXT_TRACKING_FORCE
#ifdef CONFIG_CONTEXT_TRACKING_USER_FORCE
extern void context_tracking_init(void);
#else
static inline void context_tracking_init(void) { }
#endif /* CONFIG_CONTEXT_TRACKING_FORCE */
#endif /* CONFIG_CONTEXT_TRACKING_USER_FORCE */
#endif

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