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x86/percpu: Move irq_stack variables next to current_task 

Further extend struct pcpu_hot with the hard and soft irq stack
pointers.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/20220915111145.599170752@infradead.org
This commit is contained in:
Thomas Gleixner 2022-09-15 13:11:05 +02:00 committed by Peter Zijlstra
parent c063a217bc
commit d7b6d709a7
9 changed files with 24 additions and 28 deletions
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6
arch/x86/include/asm/current.h
View File

@ -18,6 +18,12 @@ struct pcpu_hot {
int preempt_count;
int cpu_number;
unsigned long top_of_stack;
void *hardirq_stack_ptr;
#ifdef CONFIG_X86_64
bool hardirq_stack_inuse;
#else
void *softirq_stack_ptr;
#endif
};
u8 pad[64];
};

12
arch/x86/include/asm/irq_stack.h
View File

@ -116,7 +116,7 @@
ASM_CALL_ARG2
#define call_on_irqstack(func, asm_call, argconstr...) \
call_on_stack(__this_cpu_read(hardirq_stack_ptr), \
call_on_stack(__this_cpu_read(pcpu_hot.hardirq_stack_ptr), \
func, asm_call, argconstr)
/* Macros to assert type correctness for run_*_on_irqstack macros */
@ -135,7 +135,7 @@
* User mode entry and interrupt on the irq stack do not \
* switch stacks. If from user mode the task stack is empty. \
*/ \
if (user_mode(regs) || __this_cpu_read(hardirq_stack_inuse)) { \
if (user_mode(regs) || __this_cpu_read(pcpu_hot.hardirq_stack_inuse)) { \
irq_enter_rcu(); \
func(c_args); \
irq_exit_rcu(); \
@ -146,9 +146,9 @@
* places. Invoke the stack switch macro with the call \
* sequence which matches the above direct invocation. \
*/ \
__this_cpu_write(hardirq_stack_inuse, true); \
__this_cpu_write(pcpu_hot.hardirq_stack_inuse, true); \
call_on_irqstack(func, asm_call, constr); \
__this_cpu_write(hardirq_stack_inuse, false); \
__this_cpu_write(pcpu_hot.hardirq_stack_inuse, false); \
} \
}
@ -212,9 +212,9 @@
*/
#define do_softirq_own_stack() \
{ \
__this_cpu_write(hardirq_stack_inuse, true); \
__this_cpu_write(pcpu_hot.hardirq_stack_inuse, true); \
call_on_irqstack(__do_softirq, ASM_CALL_ARG0); \
__this_cpu_write(hardirq_stack_inuse, false); \
__this_cpu_write(pcpu_hot.hardirq_stack_inuse, false); \
}
#endif

4
arch/x86/include/asm/processor.h
View File

@ -448,8 +448,6 @@ static inline unsigned long cpu_kernelmode_gs_base(int cpu)
return (unsigned long)per_cpu(fixed_percpu_data.gs_base, cpu);
}
DECLARE_PER_CPU(void *, hardirq_stack_ptr);
DECLARE_PER_CPU(bool, hardirq_stack_inuse);
extern asmlinkage void ignore_sysret(void);
/* Save actual FS/GS selectors and bases to current->thread */
@ -458,8 +456,6 @@ void current_save_fsgs(void);
#ifdef CONFIG_STACKPROTECTOR
DECLARE_PER_CPU(unsigned long, __stack_chk_guard);
#endif
DECLARE_PER_CPU(struct irq_stack *, hardirq_stack_ptr);
DECLARE_PER_CPU(struct irq_stack *, softirq_stack_ptr);
#endif /* !X86_64 */
struct perf_event;

3
arch/x86/kernel/cpu/common.c
View File

@ -2024,9 +2024,6 @@ DEFINE_PER_CPU_FIRST(struct fixed_percpu_data,
fixed_percpu_data) __aligned(PAGE_SIZE) __visible;
EXPORT_PER_CPU_SYMBOL_GPL(fixed_percpu_data);
DEFINE_PER_CPU(void *, hardirq_stack_ptr);
DEFINE_PER_CPU(bool, hardirq_stack_inuse);
static void wrmsrl_cstar(unsigned long val)
{
/*

4
arch/x86/kernel/dumpstack_32.c
View File

@ -37,7 +37,7 @@ const char *stack_type_name(enum stack_type type)
static bool in_hardirq_stack(unsigned long *stack, struct stack_info *info)
{
unsigned long *begin = (unsigned long *)this_cpu_read(hardirq_stack_ptr);
unsigned long *begin = (unsigned long *)this_cpu_read(pcpu_hot.hardirq_stack_ptr);
unsigned long *end = begin + (THREAD_SIZE / sizeof(long));
/*
@ -62,7 +62,7 @@ static bool in_hardirq_stack(unsigned long *stack, struct stack_info *info)
static bool in_softirq_stack(unsigned long *stack, struct stack_info *info)
{
unsigned long *begin = (unsigned long *)this_cpu_read(softirq_stack_ptr);
unsigned long *begin = (unsigned long *)this_cpu_read(pcpu_hot.softirq_stack_ptr);
unsigned long *end = begin + (THREAD_SIZE / sizeof(long));
/*

2
arch/x86/kernel/dumpstack_64.c
View File

@ -134,7 +134,7 @@ static __always_inline bool in_exception_stack(unsigned long *stack, struct stac
static __always_inline bool in_irq_stack(unsigned long *stack, struct stack_info *info)
{
unsigned long *end = (unsigned long *)this_cpu_read(hardirq_stack_ptr);
unsigned long *end = (unsigned long *)this_cpu_read(pcpu_hot.hardirq_stack_ptr);
unsigned long *begin;
/*

13
arch/x86/kernel/irq_32.c
View File

@ -52,9 +52,6 @@ static inline int check_stack_overflow(void) { return 0; }
static inline void print_stack_overflow(void) { }
#endif
DEFINE_PER_CPU(struct irq_stack *, hardirq_stack_ptr);
DEFINE_PER_CPU(struct irq_stack *, softirq_stack_ptr);
static void call_on_stack(void *func, void *stack)
{
asm volatile("xchgl %%ebx,%%esp \n"
@ -77,7 +74,7 @@ static inline int execute_on_irq_stack(int overflow, struct irq_desc *desc)
u32 *isp, *prev_esp, arg1;
curstk = (struct irq_stack *) current_stack();
irqstk = __this_cpu_read(hardirq_stack_ptr);
irqstk = __this_cpu_read(pcpu_hot.hardirq_stack_ptr);
/*
* this is where we switch to the IRQ stack. However, if we are
@ -115,7 +112,7 @@ int irq_init_percpu_irqstack(unsigned int cpu)
int node = cpu_to_node(cpu);
struct page *ph, *ps;
if (per_cpu(hardirq_stack_ptr, cpu))
if (per_cpu(pcpu_hot.hardirq_stack_ptr, cpu))
return 0;
ph = alloc_pages_node(node, THREADINFO_GFP, THREAD_SIZE_ORDER);
@ -127,8 +124,8 @@ int irq_init_percpu_irqstack(unsigned int cpu)
return -ENOMEM;
}
per_cpu(hardirq_stack_ptr, cpu) = page_address(ph);
per_cpu(softirq_stack_ptr, cpu) = page_address(ps);
per_cpu(pcpu_hot.hardirq_stack_ptr, cpu) = page_address(ph);
per_cpu(pcpu_hot.softirq_stack_ptr, cpu) = page_address(ps);
return 0;
}
@ -138,7 +135,7 @@ void do_softirq_own_stack(void)
struct irq_stack *irqstk;
u32 *isp, *prev_esp;
irqstk = __this_cpu_read(softirq_stack_ptr);
irqstk = __this_cpu_read(pcpu_hot.softirq_stack_ptr);
/* build the stack frame on the softirq stack */
isp = (u32 *) ((char *)irqstk + sizeof(*irqstk));

6
arch/x86/kernel/irq_64.c
View File

@ -50,7 +50,7 @@ static int map_irq_stack(unsigned int cpu)
return -ENOMEM;
/* Store actual TOS to avoid adjustment in the hotpath */
per_cpu(hardirq_stack_ptr, cpu) = va + IRQ_STACK_SIZE - 8;
per_cpu(pcpu_hot.hardirq_stack_ptr, cpu) = va + IRQ_STACK_SIZE - 8;
return 0;
}
#else
@ -63,14 +63,14 @@ static int map_irq_stack(unsigned int cpu)
void *va = per_cpu_ptr(&irq_stack_backing_store, cpu);
/* Store actual TOS to avoid adjustment in the hotpath */
per_cpu(hardirq_stack_ptr, cpu) = va + IRQ_STACK_SIZE - 8;
per_cpu(pcpu_hot.hardirq_stack_ptr, cpu) = va + IRQ_STACK_SIZE - 8;
return 0;
}
#endif
int irq_init_percpu_irqstack(unsigned int cpu)
{
if (per_cpu(hardirq_stack_ptr, cpu))
if (per_cpu(pcpu_hot.hardirq_stack_ptr, cpu))
return 0;
return map_irq_stack(cpu);
}

2
arch/x86/kernel/process_64.c
View File

@ -563,7 +563,7 @@ __switch_to(struct task_struct *prev_p, struct task_struct *next_p)
int cpu = smp_processor_id();
WARN_ON_ONCE(IS_ENABLED(CONFIG_DEBUG_ENTRY) &&
this_cpu_read(hardirq_stack_inuse));
this_cpu_read(pcpu_hot.hardirq_stack_inuse));
if (!test_thread_flag(TIF_NEED_FPU_LOAD))
switch_fpu_prepare(prev_fpu, cpu);