From c3fc5cd5c5a5f4738776a965a020a32c1a37c8fd Mon Sep 17 00:00:00 2001 From: Ralf Baechle Date: Wed, 29 May 2013 01:07:19 +0200 Subject: [PATCH] MIPS: Implement HAVE_CONTEXT_TRACKING. This enables support for CONFIG_NO_HZ_FULL. Signed-off-by: Ralf Baechle --- arch/mips/Kconfig | 1 + arch/mips/include/asm/thread_info.h | 11 +++-- arch/mips/kernel/cpu-bugs64.c | 5 ++ arch/mips/kernel/ptrace.c | 12 +++++ arch/mips/kernel/signal.c | 5 ++ arch/mips/kernel/traps.c | 74 +++++++++++++++++++++++------ arch/mips/kernel/unaligned.c | 4 ++ arch/mips/mm/fault.c | 15 +++++- 8 files changed, 108 insertions(+), 19 deletions(-) diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig index ade99730ef3b..87ddac9477fa 100644 --- a/arch/mips/Kconfig +++ b/arch/mips/Kconfig @@ -1,6 +1,7 @@ config MIPS bool default y + select HAVE_CONTEXT_TRACKING select HAVE_GENERIC_DMA_COHERENT select HAVE_IDE select HAVE_OPROFILE diff --git a/arch/mips/include/asm/thread_info.h b/arch/mips/include/asm/thread_info.h index cdea4f65b944..61215a34acc6 100644 --- a/arch/mips/include/asm/thread_info.h +++ b/arch/mips/include/asm/thread_info.h @@ -109,6 +109,7 @@ static inline struct thread_info *current_thread_info(void) #define TIF_RESTORE_SIGMASK 9 /* restore signal mask in do_signal() */ #define TIF_USEDFPU 16 /* FPU was used by this task this quantum (SMP) */ #define TIF_MEMDIE 18 /* is terminating due to OOM killer */ +#define TIF_NOHZ 19 /* in adaptive nohz mode */ #define TIF_FIXADE 20 /* Fix address errors in software */ #define TIF_LOGADE 21 /* Log address errors to syslog */ #define TIF_32BIT_REGS 22 /* also implies 16/32 fprs */ @@ -124,6 +125,7 @@ static inline struct thread_info *current_thread_info(void) #define _TIF_SECCOMP (1< #include #include #include @@ -171,8 +172,12 @@ static volatile int daddi_ov __cpuinitdata; asmlinkage void __init do_daddi_ov(struct pt_regs *regs) { + enum ctx_state prev_state; + + prev_state = exception_enter(); daddi_ov = 1; regs->cp0_epc += 4; + exception_exit(prev_state); } static inline void check_daddi(void) diff --git a/arch/mips/kernel/ptrace.c b/arch/mips/kernel/ptrace.c index 9c6299c733a3..8ae1ebef8b71 100644 --- a/arch/mips/kernel/ptrace.c +++ b/arch/mips/kernel/ptrace.c @@ -15,6 +15,7 @@ * binaries. */ #include +#include #include #include #include @@ -534,6 +535,8 @@ static inline int audit_arch(void) */ asmlinkage void syscall_trace_enter(struct pt_regs *regs) { + user_exit(); + /* do the secure computing check first */ secure_computing_strict(regs->regs[2]); @@ -570,6 +573,13 @@ out: */ asmlinkage void syscall_trace_leave(struct pt_regs *regs) { + /* + * We may come here right after calling schedule_user() + * or do_notify_resume(), in which case we can be in RCU + * user mode. + */ + user_exit(); + audit_syscall_exit(regs); if (!(current->ptrace & PT_PTRACED)) @@ -592,4 +602,6 @@ asmlinkage void syscall_trace_leave(struct pt_regs *regs) send_sig(current->exit_code, current, 1); current->exit_code = 0; } + + user_enter(); } diff --git a/arch/mips/kernel/signal.c b/arch/mips/kernel/signal.c index fd3ef2c2afbc..2f285abc76d5 100644 --- a/arch/mips/kernel/signal.c +++ b/arch/mips/kernel/signal.c @@ -8,6 +8,7 @@ * Copyright (C) 1999, 2000 Silicon Graphics, Inc. */ #include +#include #include #include #include @@ -573,6 +574,8 @@ asmlinkage void do_notify_resume(struct pt_regs *regs, void *unused, { local_irq_enable(); + user_exit(); + /* deal with pending signal delivery */ if (thread_info_flags & _TIF_SIGPENDING) do_signal(regs); @@ -581,6 +584,8 @@ asmlinkage void do_notify_resume(struct pt_regs *regs, void *unused, clear_thread_flag(TIF_NOTIFY_RESUME); tracehook_notify_resume(regs); } + + user_enter(); } #ifdef CONFIG_SMP diff --git a/arch/mips/kernel/traps.c b/arch/mips/kernel/traps.c index a75ae40184aa..beba1e616b6e 100644 --- a/arch/mips/kernel/traps.c +++ b/arch/mips/kernel/traps.c @@ -13,6 +13,7 @@ */ #include #include +#include #include #include #include @@ -423,7 +424,9 @@ asmlinkage void do_be(struct pt_regs *regs) const struct exception_table_entry *fixup = NULL; int data = regs->cp0_cause & 4; int action = MIPS_BE_FATAL; + enum ctx_state prev_state; + prev_state = exception_enter(); /* XXX For now. Fixme, this searches the wrong table ... */ if (data && !user_mode(regs)) fixup = search_dbe_tables(exception_epc(regs)); @@ -436,11 +439,11 @@ asmlinkage void do_be(struct pt_regs *regs) switch (action) { case MIPS_BE_DISCARD: - return; + goto out; case MIPS_BE_FIXUP: if (fixup) { regs->cp0_epc = fixup->nextinsn; - return; + goto out; } break; default: @@ -455,10 +458,13 @@ asmlinkage void do_be(struct pt_regs *regs) field, regs->cp0_epc, field, regs->regs[31]); if (notify_die(DIE_OOPS, "bus error", regs, 0, regs_to_trapnr(regs), SIGBUS) == NOTIFY_STOP) - return; + goto out; die_if_kernel("Oops", regs); force_sig(SIGBUS, current); + +out: + exception_exit(prev_state); } /* @@ -673,8 +679,10 @@ static int simulate_sync(struct pt_regs *regs, unsigned int opcode) asmlinkage void do_ov(struct pt_regs *regs) { + enum ctx_state prev_state; siginfo_t info; + prev_state = exception_enter(); die_if_kernel("Integer overflow", regs); info.si_code = FPE_INTOVF; @@ -682,6 +690,7 @@ asmlinkage void do_ov(struct pt_regs *regs) info.si_errno = 0; info.si_addr = (void __user *) regs->cp0_epc; force_sig_info(SIGFPE, &info, current); + exception_exit(prev_state); } int process_fpemu_return(int sig, void __user *fault_addr) @@ -713,11 +722,13 @@ int process_fpemu_return(int sig, void __user *fault_addr) */ asmlinkage void do_fpe(struct pt_regs *regs, unsigned long fcr31) { + enum ctx_state prev_state; siginfo_t info = {0}; + prev_state = exception_enter(); if (notify_die(DIE_FP, "FP exception", regs, 0, regs_to_trapnr(regs), SIGFPE) == NOTIFY_STOP) - return; + goto out; die_if_kernel("FP exception in kernel code", regs); if (fcr31 & FPU_CSR_UNI_X) { @@ -753,7 +764,7 @@ asmlinkage void do_fpe(struct pt_regs *regs, unsigned long fcr31) /* If something went wrong, signal */ process_fpemu_return(sig, fault_addr); - return; + goto out; } else if (fcr31 & FPU_CSR_INV_X) info.si_code = FPE_FLTINV; else if (fcr31 & FPU_CSR_DIV_X) @@ -770,6 +781,9 @@ asmlinkage void do_fpe(struct pt_regs *regs, unsigned long fcr31) info.si_errno = 0; info.si_addr = (void __user *) regs->cp0_epc; force_sig_info(SIGFPE, &info, current); + +out: + exception_exit(prev_state); } static void do_trap_or_bp(struct pt_regs *regs, unsigned int code, @@ -835,9 +849,11 @@ static void do_trap_or_bp(struct pt_regs *regs, unsigned int code, asmlinkage void do_bp(struct pt_regs *regs) { unsigned int opcode, bcode; + enum ctx_state prev_state; unsigned long epc; u16 instr[2]; + prev_state = exception_enter(); if (get_isa16_mode(regs->cp0_epc)) { /* Calculate EPC. */ epc = exception_epc(regs); @@ -852,7 +868,7 @@ asmlinkage void do_bp(struct pt_regs *regs) goto out_sigsegv; bcode = (instr[0] >> 6) & 0x3f; do_trap_or_bp(regs, bcode, "Break"); - return; + goto out; } } else { if (__get_user(opcode, (unsigned int __user *) exception_epc(regs))) @@ -876,12 +892,12 @@ asmlinkage void do_bp(struct pt_regs *regs) switch (bcode) { case BRK_KPROBE_BP: if (notify_die(DIE_BREAK, "debug", regs, bcode, regs_to_trapnr(regs), SIGTRAP) == NOTIFY_STOP) - return; + goto out; else break; case BRK_KPROBE_SSTEPBP: if (notify_die(DIE_SSTEPBP, "single_step", regs, bcode, regs_to_trapnr(regs), SIGTRAP) == NOTIFY_STOP) - return; + goto out; else break; default: @@ -889,18 +905,24 @@ asmlinkage void do_bp(struct pt_regs *regs) } do_trap_or_bp(regs, bcode, "Break"); + +out: + exception_exit(prev_state); return; out_sigsegv: force_sig(SIGSEGV, current); + goto out; } asmlinkage void do_tr(struct pt_regs *regs) { u32 opcode, tcode = 0; + enum ctx_state prev_state; u16 instr[2]; unsigned long epc = msk_isa16_mode(exception_epc(regs)); + prev_state = exception_enter(); if (get_isa16_mode(regs->cp0_epc)) { if (__get_user(instr[0], (u16 __user *)(epc + 0)) || __get_user(instr[1], (u16 __user *)(epc + 2))) @@ -918,10 +940,14 @@ asmlinkage void do_tr(struct pt_regs *regs) } do_trap_or_bp(regs, tcode, "Trap"); + +out: + exception_exit(prev_state); return; out_sigsegv: force_sig(SIGSEGV, current); + goto out; } asmlinkage void do_ri(struct pt_regs *regs) @@ -929,17 +955,19 @@ asmlinkage void do_ri(struct pt_regs *regs) unsigned int __user *epc = (unsigned int __user *)exception_epc(regs); unsigned long old_epc = regs->cp0_epc; unsigned long old31 = regs->regs[31]; + enum ctx_state prev_state; unsigned int opcode = 0; int status = -1; + prev_state = exception_enter(); if (notify_die(DIE_RI, "RI Fault", regs, 0, regs_to_trapnr(regs), SIGILL) == NOTIFY_STOP) - return; + goto out; die_if_kernel("Reserved instruction in kernel code", regs); if (unlikely(compute_return_epc(regs) < 0)) - return; + goto out; if (get_isa16_mode(regs->cp0_epc)) { unsigned short mmop[2] = { 0 }; @@ -974,6 +1002,9 @@ asmlinkage void do_ri(struct pt_regs *regs) regs->regs[31] = old31; force_sig(status, current); } + +out: + exception_exit(prev_state); } /* @@ -1040,6 +1071,7 @@ static int default_cu2_call(struct notifier_block *nfb, unsigned long action, asmlinkage void do_cpu(struct pt_regs *regs) { + enum ctx_state prev_state; unsigned int __user *epc; unsigned long old_epc, old31; unsigned int opcode; @@ -1047,6 +1079,7 @@ asmlinkage void do_cpu(struct pt_regs *regs) int status; unsigned long __maybe_unused flags; + prev_state = exception_enter(); die_if_kernel("do_cpu invoked from kernel context!", regs); cpid = (regs->cp0_cause >> CAUSEB_CE) & 3; @@ -1060,7 +1093,7 @@ asmlinkage void do_cpu(struct pt_regs *regs) status = -1; if (unlikely(compute_return_epc(regs) < 0)) - return; + goto out; if (get_isa16_mode(regs->cp0_epc)) { unsigned short mmop[2] = { 0 }; @@ -1093,7 +1126,7 @@ asmlinkage void do_cpu(struct pt_regs *regs) force_sig(status, current); } - return; + goto out; case 3: /* @@ -1131,19 +1164,26 @@ asmlinkage void do_cpu(struct pt_regs *regs) mt_ase_fp_affinity(); } - return; + goto out; case 2: raw_notifier_call_chain(&cu2_chain, CU2_EXCEPTION, regs); - return; + goto out; } force_sig(SIGILL, current); + +out: + exception_exit(prev_state); } asmlinkage void do_mdmx(struct pt_regs *regs) { + enum ctx_state prev_state; + + prev_state = exception_enter(); force_sig(SIGILL, current); + exception_exit(prev_state); } /* @@ -1151,8 +1191,10 @@ asmlinkage void do_mdmx(struct pt_regs *regs) */ asmlinkage void do_watch(struct pt_regs *regs) { + enum ctx_state prev_state; u32 cause; + prev_state = exception_enter(); /* * Clear WP (bit 22) bit of cause register so we don't loop * forever. @@ -1174,13 +1216,16 @@ asmlinkage void do_watch(struct pt_regs *regs) mips_clear_watch_registers(); local_irq_enable(); } + exception_exit(prev_state); } asmlinkage void do_mcheck(struct pt_regs *regs) { const int field = 2 * sizeof(unsigned long); int multi_match = regs->cp0_status & ST0_TS; + enum ctx_state prev_state; + prev_state = exception_enter(); show_regs(regs); if (multi_match) { @@ -1202,6 +1247,7 @@ asmlinkage void do_mcheck(struct pt_regs *regs) panic("Caught Machine Check exception - %scaused by multiple " "matching entries in the TLB.", (multi_match) ? "" : "not "); + exception_exit(prev_state); } asmlinkage void do_mt(struct pt_regs *regs) diff --git a/arch/mips/kernel/unaligned.c b/arch/mips/kernel/unaligned.c index 203d8857070d..3eaa02aa8ae0 100644 --- a/arch/mips/kernel/unaligned.c +++ b/arch/mips/kernel/unaligned.c @@ -72,6 +72,7 @@ * A store crossing a page boundary might be executed only partially. * Undo the partial store in this case. */ +#include #include #include #include @@ -1550,9 +1551,11 @@ sigill: } asmlinkage void do_ade(struct pt_regs *regs) { + enum ctx_state prev_state; unsigned int __user *pc; mm_segment_t seg; + prev_state = exception_enter(); perf_sw_event(PERF_COUNT_SW_ALIGNMENT_FAULTS, 1, regs, regs->cp0_badvaddr); /* @@ -1628,6 +1631,7 @@ sigbus: /* * XXX On return from the signal handler we should advance the epc */ + exception_exit(prev_state); } #ifdef CONFIG_DEBUG_FS diff --git a/arch/mips/mm/fault.c b/arch/mips/mm/fault.c index 0fead53d1c26..85df1cd8d446 100644 --- a/arch/mips/mm/fault.c +++ b/arch/mips/mm/fault.c @@ -5,6 +5,7 @@ * * Copyright (C) 1995 - 2000 by Ralf Baechle */ +#include #include #include #include @@ -32,8 +33,8 @@ * and the problem, and then passes it off to one of the appropriate * routines. */ -asmlinkage void __kprobes do_page_fault(struct pt_regs *regs, unsigned long write, - unsigned long address) +static void __kprobes __do_page_fault(struct pt_regs *regs, unsigned long write, + unsigned long address) { struct vm_area_struct * vma = NULL; struct task_struct *tsk = current; @@ -312,3 +313,13 @@ vmalloc_fault: } #endif } + +asmlinkage void __kprobes do_page_fault(struct pt_regs *regs, + unsigned long write, unsigned long address) +{ + enum ctx_state prev_state; + + prev_state = exception_enter(); + __do_page_fault(regs, write, address); + exception_exit(prev_state); +} -- 2.30.2