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-rw-r--r--arch/s390/include/asm/processor.h402
1 files changed, 197 insertions, 205 deletions
diff --git a/arch/s390/include/asm/processor.h b/arch/s390/include/asm/processor.h
index 81038ab357ce..3affba95845b 100644
--- a/arch/s390/include/asm/processor.h
+++ b/arch/s390/include/asm/processor.h
@@ -12,63 +12,87 @@
#ifndef __ASM_S390_PROCESSOR_H
#define __ASM_S390_PROCESSOR_H
-#include <linux/const.h>
-
-#define CIF_MCCK_PENDING 0 /* machine check handling is pending */
-#define CIF_ASCE_PRIMARY 1 /* primary asce needs fixup / uaccess */
-#define CIF_ASCE_SECONDARY 2 /* secondary asce needs fixup / uaccess */
-#define CIF_NOHZ_DELAY 3 /* delay HZ disable for a tick */
-#define CIF_FPU 4 /* restore FPU registers */
-#define CIF_IGNORE_IRQ 5 /* ignore interrupt (for udelay) */
-#define CIF_ENABLED_WAIT 6 /* in enabled wait state */
-#define CIF_MCCK_GUEST 7 /* machine check happening in guest */
-#define CIF_DEDICATED_CPU 8 /* this CPU is dedicated */
-
-#define _CIF_MCCK_PENDING _BITUL(CIF_MCCK_PENDING)
-#define _CIF_ASCE_PRIMARY _BITUL(CIF_ASCE_PRIMARY)
-#define _CIF_ASCE_SECONDARY _BITUL(CIF_ASCE_SECONDARY)
-#define _CIF_NOHZ_DELAY _BITUL(CIF_NOHZ_DELAY)
-#define _CIF_FPU _BITUL(CIF_FPU)
-#define _CIF_IGNORE_IRQ _BITUL(CIF_IGNORE_IRQ)
-#define _CIF_ENABLED_WAIT _BITUL(CIF_ENABLED_WAIT)
-#define _CIF_MCCK_GUEST _BITUL(CIF_MCCK_GUEST)
-#define _CIF_DEDICATED_CPU _BITUL(CIF_DEDICATED_CPU)
-
-#ifndef __ASSEMBLY__
+#include <linux/bits.h>
+#define CIF_NOHZ_DELAY 2 /* delay HZ disable for a tick */
+#define CIF_ENABLED_WAIT 5 /* in enabled wait state */
+#define CIF_MCCK_GUEST 6 /* machine check happening in guest */
+#define CIF_DEDICATED_CPU 7 /* this CPU is dedicated */
+
+#define _CIF_NOHZ_DELAY BIT(CIF_NOHZ_DELAY)
+#define _CIF_ENABLED_WAIT BIT(CIF_ENABLED_WAIT)
+#define _CIF_MCCK_GUEST BIT(CIF_MCCK_GUEST)
+#define _CIF_DEDICATED_CPU BIT(CIF_DEDICATED_CPU)
+
+#define RESTART_FLAG_CTLREGS _AC(1 << 0, U)
+
+#ifndef __ASSEMBLER__
+
+#include <linux/cpumask.h>
#include <linux/linkage.h>
#include <linux/irqflags.h>
+#include <linux/bitops.h>
+#include <asm/fpu-types.h>
#include <asm/cpu.h>
#include <asm/page.h>
#include <asm/ptrace.h>
#include <asm/setup.h>
#include <asm/runtime_instr.h>
-#include <asm/fpu/types.h>
-#include <asm/fpu/internal.h>
+#include <asm/irqflags.h>
+#include <asm/alternative.h>
+#include <asm/fault.h>
+
+struct pcpu {
+ unsigned long ec_mask; /* bit mask for ec_xxx functions */
+ unsigned long ec_clk; /* sigp timestamp for ec_xxx */
+ unsigned long flags; /* per CPU flags */
+ unsigned long capacity; /* cpu capacity for scheduler */
+ signed char state; /* physical cpu state */
+ signed char polarization; /* physical polarization */
+ u16 address; /* physical cpu address */
+};
+
+DECLARE_PER_CPU(struct pcpu, pcpu_devices);
+
+typedef long (*sys_call_ptr_t)(struct pt_regs *regs);
+
+static __always_inline struct pcpu *this_pcpu(void)
+{
+ return (struct pcpu *)(get_lowcore()->pcpu);
+}
-static inline void set_cpu_flag(int flag)
+static __always_inline void set_cpu_flag(int flag)
{
- S390_lowcore.cpu_flags |= (1UL << flag);
+ set_bit(flag, &this_pcpu()->flags);
}
-static inline void clear_cpu_flag(int flag)
+static __always_inline void clear_cpu_flag(int flag)
{
- S390_lowcore.cpu_flags &= ~(1UL << flag);
+ clear_bit(flag, &this_pcpu()->flags);
}
-static inline int test_cpu_flag(int flag)
+static __always_inline bool test_cpu_flag(int flag)
{
- return !!(S390_lowcore.cpu_flags & (1UL << flag));
+ return test_bit(flag, &this_pcpu()->flags);
+}
+
+static __always_inline bool test_and_set_cpu_flag(int flag)
+{
+ return test_and_set_bit(flag, &this_pcpu()->flags);
+}
+
+static __always_inline bool test_and_clear_cpu_flag(int flag)
+{
+ return test_and_clear_bit(flag, &this_pcpu()->flags);
}
/*
* Test CIF flag of another CPU. The caller needs to ensure that
* CPU hotplug can not happen, e.g. by disabling preemption.
*/
-static inline int test_cpu_flag_of(int flag, int cpu)
+static __always_inline bool test_cpu_flag_of(int flag, int cpu)
{
- struct lowcore *lc = lowcore_ptr[cpu];
- return !!(lc->cpu_flags & (1UL << flag));
+ return test_bit(flag, &per_cpu(pcpu_devices, cpu).flags);
}
#define arch_needs_cpu() test_cpu_flag(CIF_NOHZ_DELAY)
@@ -78,70 +102,100 @@ static inline void get_cpu_id(struct cpuid *ptr)
asm volatile("stidp %0" : "=Q" (*ptr));
}
+static __always_inline unsigned long get_cpu_timer(void)
+{
+ unsigned long timer;
+
+ asm volatile("stpt %[timer]" : [timer] "=Q" (timer));
+ return timer;
+}
+
void s390_adjust_jiffies(void);
void s390_update_cpu_mhz(void);
void cpu_detect_mhz_feature(void);
extern const struct seq_operations cpuinfo_op;
-extern int sysctl_ieee_emulation_warnings;
extern void execve_tail(void);
-extern void __bpon(void);
+unsigned long vdso_text_size(void);
+unsigned long vdso_size(void);
-/*
- * User space process size: 2GB for 31 bit, 4TB or 8PT for 64 bit.
- */
-
-#define TASK_SIZE_OF(tsk) (test_tsk_thread_flag(tsk, TIF_31BIT) ? \
- (1UL << 31) : -PAGE_SIZE)
-#define TASK_UNMAPPED_BASE (test_thread_flag(TIF_31BIT) ? \
- (1UL << 30) : (1UL << 41))
-#define TASK_SIZE TASK_SIZE_OF(current)
+#define TASK_SIZE (TASK_SIZE_MAX)
+#define TASK_UNMAPPED_BASE (_REGION2_SIZE >> 1)
#define TASK_SIZE_MAX (-PAGE_SIZE)
-#define STACK_TOP (test_thread_flag(TIF_31BIT) ? \
- (1UL << 31) : (1UL << 42))
-#define STACK_TOP_MAX (1UL << 42)
+#define VDSO_BASE (STACK_TOP + PAGE_SIZE)
+#define VDSO_LIMIT (_REGION2_SIZE)
+#define STACK_TOP (VDSO_LIMIT - vdso_size() - PAGE_SIZE)
+#define STACK_TOP_MAX (_REGION2_SIZE - vdso_size() - PAGE_SIZE)
#define HAVE_ARCH_PICK_MMAP_LAYOUT
-typedef unsigned int mm_segment_t;
+#define __stackleak_poison __stackleak_poison
+static __always_inline void __stackleak_poison(unsigned long erase_low,
+ unsigned long erase_high,
+ unsigned long poison)
+{
+ unsigned long tmp, count;
+
+ count = erase_high - erase_low;
+ if (!count)
+ return;
+ asm volatile(
+ " cghi %[count],8\n"
+ " je 2f\n"
+ " aghi %[count],-(8+1)\n"
+ " srlg %[tmp],%[count],8\n"
+ " ltgr %[tmp],%[tmp]\n"
+ " jz 1f\n"
+ "0: stg %[poison],0(%[addr])\n"
+ " mvc 8(256-8,%[addr]),0(%[addr])\n"
+ " la %[addr],256(%[addr])\n"
+ " brctg %[tmp],0b\n"
+ "1: stg %[poison],0(%[addr])\n"
+ " exrl %[count],3f\n"
+ " j 4f\n"
+ "2: stg %[poison],0(%[addr])\n"
+ " j 4f\n"
+ "3: mvc 8(1,%[addr]),0(%[addr])\n"
+ "4:"
+ : [addr] "+&a" (erase_low), [count] "+&d" (count), [tmp] "=&a" (tmp)
+ : [poison] "d" (poison)
+ : "memory", "cc"
+ );
+}
/*
* Thread structure
*/
struct thread_struct {
unsigned int acrs[NUM_ACRS];
- unsigned long ksp; /* kernel stack pointer */
- unsigned long user_timer; /* task cputime in user space */
- unsigned long guest_timer; /* task cputime in kvm guest */
- unsigned long system_timer; /* task cputime in kernel space */
- unsigned long hardirq_timer; /* task cputime in hardirq context */
- unsigned long softirq_timer; /* task cputime in softirq context */
- unsigned long sys_call_table; /* system call table address */
- mm_segment_t mm_segment;
- unsigned long gmap_addr; /* address of last gmap fault. */
- unsigned int gmap_write_flag; /* gmap fault write indication */
- unsigned int gmap_int_code; /* int code of last gmap fault */
- unsigned int gmap_pfault; /* signal of a pending guest pfault */
+ unsigned long ksp; /* kernel stack pointer */
+ unsigned long user_timer; /* task cputime in user space */
+ unsigned long guest_timer; /* task cputime in kvm guest */
+ unsigned long system_timer; /* task cputime in kernel space */
+ unsigned long hardirq_timer; /* task cputime in hardirq context */
+ unsigned long softirq_timer; /* task cputime in softirq context */
+ union teid gmap_teid; /* address and flags of last gmap fault */
+ unsigned int gmap_int_code; /* int code of last gmap fault */
+ int ufpu_flags; /* user fpu flags */
+ int kfpu_flags; /* kernel fpu flags */
+
/* Per-thread information related to debugging */
- struct per_regs per_user; /* User specified PER registers */
- struct per_event per_event; /* Cause of the last PER trap */
- unsigned long per_flags; /* Flags to control debug behavior */
- unsigned int system_call; /* system call number in signal */
- unsigned long last_break; /* last breaking-event-address. */
- /* pfault_wait is used to block the process on a pfault event */
+ struct per_regs per_user; /* User specified PER registers */
+ struct per_event per_event; /* Cause of the last PER trap */
+ unsigned long per_flags; /* Flags to control debug behavior */
+ unsigned int system_call; /* system call number in signal */
+ unsigned long last_break; /* last breaking-event-address. */
+ /* pfault_wait is used to block the process on a pfault event */
unsigned long pfault_wait;
struct list_head list;
/* cpu runtime instrumentation */
struct runtime_instr_cb *ri_cb;
- struct gs_cb *gs_cb; /* Current guarded storage cb */
- struct gs_cb *gs_bc_cb; /* Broadcast guarded storage cb */
- unsigned char trap_tdb[256]; /* Transaction abort diagnose block */
- /*
- * Warning: 'fpu' is dynamically-sized. It *MUST* be at
- * the end.
- */
- struct fpu fpu; /* FP and VX register save area */
+ struct gs_cb *gs_cb; /* Current guarded storage cb */
+ struct gs_cb *gs_bc_cb; /* Broadcast guarded storage cb */
+ struct pgm_tdb trap_tdb; /* Transaction abort diagnose block */
+ struct fpu ufpu; /* User FP and VX register save area */
+ struct fpu kfpu; /* Kernel FP and VX register save area */
};
/* Flag to disable transactions. */
@@ -156,30 +210,11 @@ struct thread_struct {
typedef struct thread_struct thread_struct;
-/*
- * Stack layout of a C stack frame.
- */
-#ifndef __PACK_STACK
-struct stack_frame {
- unsigned long back_chain;
- unsigned long empty1[5];
- unsigned long gprs[10];
- unsigned int empty2[8];
-};
-#else
-struct stack_frame {
- unsigned long empty1[5];
- unsigned int empty2[8];
- unsigned long gprs[10];
- unsigned long back_chain;
-};
-#endif
-
#define ARCH_MIN_TASKALIGN 8
#define INIT_THREAD { \
.ksp = sizeof(init_stack) + (unsigned long) &init_stack, \
- .fpu.regs = (void *) init_task.thread.fpu.fprs, \
+ .last_break = 1, \
}
/*
@@ -196,30 +231,22 @@ struct stack_frame {
regs->psw.mask = PSW_USER_BITS | PSW_MASK_BA; \
regs->psw.addr = new_psw; \
regs->gprs[15] = new_stackp; \
- crst_table_downgrade(current->mm); \
execve_tail(); \
} while (0)
-/* Forward declaration, a strange C thing */
struct task_struct;
struct mm_struct;
struct seq_file;
struct pt_regs;
-typedef int (*dump_trace_func_t)(void *data, unsigned long address, int reliable);
-void dump_trace(dump_trace_func_t func, void *data,
- struct task_struct *task, unsigned long sp);
void show_registers(struct pt_regs *regs);
-
void show_cacheinfo(struct seq_file *m);
-/* Free all resources held by a thread. */
-static inline void release_thread(struct task_struct *tsk) { }
-
/* Free guarded storage control block */
void guarded_storage_release(struct task_struct *tsk);
+void gs_load_bc_cb(struct pt_regs *regs);
-unsigned long get_wchan(struct task_struct *p);
+unsigned long __get_wchan(struct task_struct *p);
#define task_pt_regs(tsk) ((struct pt_regs *) \
(task_stack_page(tsk) + THREAD_SIZE) - 1)
#define KSTK_EIP(tsk) (task_pt_regs(tsk)->psw.addr)
@@ -228,15 +255,25 @@ unsigned long get_wchan(struct task_struct *p);
/* Has task runtime instrumentation enabled ? */
#define is_ri_task(tsk) (!!(tsk)->thread.ri_cb)
-static inline unsigned long current_stack_pointer(void)
+/* avoid using global register due to gcc bug in versions < 8.4 */
+#define current_stack_pointer (__current_stack_pointer())
+
+static __always_inline unsigned long __current_stack_pointer(void)
{
unsigned long sp;
- asm volatile("la %0,0(15)" : "=a" (sp));
+ asm volatile("lgr %0,15" : "=d" (sp));
return sp;
}
-static __no_kasan_or_inline unsigned short stap(void)
+static __always_inline bool on_thread_stack(void)
+{
+ unsigned long ksp = get_lowcore()->kernel_stack;
+
+ return !((ksp ^ current_stack_pointer) & ~(THREAD_SIZE - 1));
+}
+
+static __always_inline unsigned short stap(void)
{
unsigned short cpu_address;
@@ -244,61 +281,6 @@ static __no_kasan_or_inline unsigned short stap(void)
return cpu_address;
}
-#define CALL_ARGS_0() \
- register unsigned long r2 asm("2")
-#define CALL_ARGS_1(arg1) \
- register unsigned long r2 asm("2") = (unsigned long)(arg1)
-#define CALL_ARGS_2(arg1, arg2) \
- CALL_ARGS_1(arg1); \
- register unsigned long r3 asm("3") = (unsigned long)(arg2)
-#define CALL_ARGS_3(arg1, arg2, arg3) \
- CALL_ARGS_2(arg1, arg2); \
- register unsigned long r4 asm("4") = (unsigned long)(arg3)
-#define CALL_ARGS_4(arg1, arg2, arg3, arg4) \
- CALL_ARGS_3(arg1, arg2, arg3); \
- register unsigned long r4 asm("5") = (unsigned long)(arg4)
-#define CALL_ARGS_5(arg1, arg2, arg3, arg4, arg5) \
- CALL_ARGS_4(arg1, arg2, arg3, arg4); \
- register unsigned long r4 asm("6") = (unsigned long)(arg5)
-
-#define CALL_FMT_0
-#define CALL_FMT_1 CALL_FMT_0, "0" (r2)
-#define CALL_FMT_2 CALL_FMT_1, "d" (r3)
-#define CALL_FMT_3 CALL_FMT_2, "d" (r4)
-#define CALL_FMT_4 CALL_FMT_3, "d" (r5)
-#define CALL_FMT_5 CALL_FMT_4, "d" (r6)
-
-#define CALL_CLOBBER_5 "0", "1", "14", "cc", "memory"
-#define CALL_CLOBBER_4 CALL_CLOBBER_5
-#define CALL_CLOBBER_3 CALL_CLOBBER_4, "5"
-#define CALL_CLOBBER_2 CALL_CLOBBER_3, "4"
-#define CALL_CLOBBER_1 CALL_CLOBBER_2, "3"
-#define CALL_CLOBBER_0 CALL_CLOBBER_1
-
-#define CALL_ON_STACK(fn, stack, nr, args...) \
-({ \
- CALL_ARGS_##nr(args); \
- unsigned long prev; \
- \
- asm volatile( \
- " la %[_prev],0(15)\n" \
- " la 15,0(%[_stack])\n" \
- " stg %[_prev],%[_bc](15)\n" \
- " brasl 14,%[_fn]\n" \
- " la 15,0(%[_prev])\n" \
- : "+&d" (r2), [_prev] "=&a" (prev) \
- : [_stack] "a" (stack), \
- [_bc] "i" (offsetof(struct stack_frame, back_chain)), \
- [_fn] "X" (fn) CALL_FMT_##nr : CALL_CLOBBER_##nr); \
- r2; \
-})
-
-/*
- * Give up the time slice of the virtual PU.
- */
-#define cpu_relax_yield cpu_relax_yield
-void cpu_relax_yield(void);
-
#define cpu_relax() barrier()
#define ECAG_CACHE_ATTRIBUTE 0
@@ -308,8 +290,7 @@ static inline unsigned long __ecag(unsigned int asi, unsigned char parm)
{
unsigned long val;
- asm volatile(".insn rsy,0xeb000000004c,%0,0,0(%1)" /* ecag */
- : "=d" (val) : "a" (asi << 8 | parm));
+ asm volatile("ecag %0,0,0(%1)" : "=d" (val) : "a" (asi << 8 | parm));
return val;
}
@@ -330,19 +311,19 @@ static inline void __load_psw(psw_t psw)
* Set PSW mask to specified value, while leaving the
* PSW addr pointing to the next instruction.
*/
-static __no_kasan_or_inline void __load_psw_mask(unsigned long mask)
+static __always_inline void __load_psw_mask(unsigned long mask)
{
+ psw_t psw __uninitialized;
unsigned long addr;
- psw_t psw;
psw.mask = mask;
asm volatile(
" larl %0,1f\n"
- " stg %0,%O1+8(%R1)\n"
- " lpswe %1\n"
+ " stg %0,%1\n"
+ " lpswe %2\n"
"1:"
- : "=&d" (addr), "=Q" (psw) : "Q" (psw) : "memory", "cc");
+ : "=&d" (addr), "=Q" (psw.addr) : "Q" (psw) : "memory", "cc");
}
/*
@@ -356,74 +337,85 @@ static inline unsigned long __extract_psw(void)
return (((unsigned long) reg1) << 32) | ((unsigned long) reg2);
}
-static inline void local_mcck_enable(void)
+static inline unsigned long __local_mcck_save(void)
{
- __load_psw_mask(__extract_psw() | PSW_MASK_MCHECK);
+ unsigned long mask = __extract_psw();
+
+ __load_psw_mask(mask & ~PSW_MASK_MCHECK);
+ return mask & PSW_MASK_MCHECK;
+}
+
+#define local_mcck_save(mflags) \
+do { \
+ typecheck(unsigned long, mflags); \
+ mflags = __local_mcck_save(); \
+} while (0)
+
+static inline void local_mcck_restore(unsigned long mflags)
+{
+ unsigned long mask = __extract_psw();
+
+ mask &= ~PSW_MASK_MCHECK;
+ __load_psw_mask(mask | mflags);
}
static inline void local_mcck_disable(void)
{
- __load_psw_mask(__extract_psw() & ~PSW_MASK_MCHECK);
+ __local_mcck_save();
+}
+
+static inline void local_mcck_enable(void)
+{
+ __load_psw_mask(__extract_psw() | PSW_MASK_MCHECK);
}
/*
* Rewind PSW instruction address by specified number of bytes.
*/
-static inline unsigned long __rewind_psw(psw_t psw, unsigned long ilc)
+static inline unsigned long __rewind_psw(psw_t psw, long ilen)
{
unsigned long mask;
mask = (psw.mask & PSW_MASK_EA) ? -1UL :
(psw.mask & PSW_MASK_BA) ? (1UL << 31) - 1 :
(1UL << 24) - 1;
- return (psw.addr - ilc) & mask;
+ return (psw.addr - ilen) & mask;
}
-/*
- * Function to stop a processor until the next interrupt occurs
- */
-void enabled_wait(void);
+static inline unsigned long __forward_psw(psw_t psw, long ilen)
+{
+ return __rewind_psw(psw, -ilen);
+}
/*
* Function to drop a processor into disabled wait state
*/
-static inline void __noreturn disabled_wait(unsigned long code)
+static __always_inline void __noreturn disabled_wait(void)
{
psw_t psw;
psw.mask = PSW_MASK_BASE | PSW_MASK_WAIT | PSW_MASK_BA | PSW_MASK_EA;
- psw.addr = code;
+ psw.addr = _THIS_IP_;
__load_psw(psw);
while (1);
}
-/*
- * Basic Machine Check/Program Check Handler.
- */
-
-extern void s390_base_mcck_handler(void);
-extern void s390_base_pgm_handler(void);
-extern void s390_base_ext_handler(void);
-
-extern void (*s390_base_mcck_handler_fn)(void);
-extern void (*s390_base_pgm_handler_fn)(void);
-extern void (*s390_base_ext_handler_fn)(void);
-
#define ARCH_LOW_ADDRESS_LIMIT 0x7fffffffUL
-extern int memcpy_real(void *, void *, size_t);
-extern void memcpy_absolute(void *, void *, size_t);
-
-#define mem_assign_absolute(dest, val) do { \
- __typeof__(dest) __tmp = (val); \
- \
- BUILD_BUG_ON(sizeof(__tmp) != sizeof(val)); \
- memcpy_absolute(&(dest), &__tmp, sizeof(__tmp)); \
-} while (0)
+static __always_inline bool regs_irqs_disabled(struct pt_regs *regs)
+{
+ return arch_irqs_disabled_flags(regs->psw.mask);
+}
-extern int s390_isolate_bp(void);
-extern int s390_isolate_bp_guest(void);
+static __always_inline void bpon(void)
+{
+ asm_inline volatile(
+ ALTERNATIVE(" nop\n",
+ " .insn rrf,0xb2e80000,0,0,13,0\n",
+ ALT_SPEC(82))
+ );
+}
-#endif /* __ASSEMBLY__ */
+#endif /* __ASSEMBLER__ */
#endif /* __ASM_S390_PROCESSOR_H */
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