| Message ID | 20201128144114.944000-4-npiggin@gmail.com (mailing list archive) |
|---|---|
| State | Superseded |
| Headers | show |
| Series | powerpc: interrupt wrappers | expand |
| Context | Check | Description |
|---|---|---|
| snowpatch_ozlabs/apply_patch | success | Successfully applied on branch powerpc/merge (2551450071df2dabd7134e548ac209688ac6741d) |
| snowpatch_ozlabs/checkpatch | warning | total: 0 errors, 2 warnings, 1 checks, 193 lines checked |
| snowpatch_ozlabs/needsstable | success | Patch has no Fixes tags |
Nicholas Piggin <npiggin@gmail.com> writes: > Similar to the previous patch this makes interrupt handler function > types more regular so they can be wrapped with the next patch. > > bad_page_fault and do_break are not performance critical. > Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com> > [32s DABR code from Christophe Leroy <christophe.leroy@csgroup.eu>] > Signed-off-by: Nicholas Piggin <npiggin@gmail.com> > --- > arch/powerpc/include/asm/bug.h | 2 +- > arch/powerpc/include/asm/debug.h | 3 +-- > arch/powerpc/kernel/entry_32.S | 18 +----------------- > arch/powerpc/kernel/exceptions-64e.S | 3 +-- > arch/powerpc/kernel/exceptions-64s.S | 3 +-- > arch/powerpc/kernel/head_8xx.S | 5 ++--- > arch/powerpc/kernel/head_book3s_32.S | 3 +++ > arch/powerpc/kernel/process.c | 7 +++---- > arch/powerpc/kernel/traps.c | 2 +- > arch/powerpc/mm/book3s64/hash_utils.c | 4 ++-- > arch/powerpc/mm/book3s64/slb.c | 2 +- > arch/powerpc/mm/fault.c | 10 +++++----- > arch/powerpc/platforms/8xx/machine_check.c | 2 +- > 13 files changed, 23 insertions(+), 41 deletions(-) > > diff --git a/arch/powerpc/include/asm/bug.h b/arch/powerpc/include/asm/bug.h > index 897bad6b6bbb..49162faba33f 100644 > --- a/arch/powerpc/include/asm/bug.h > +++ b/arch/powerpc/include/asm/bug.h > @@ -113,7 +113,7 @@ > struct pt_regs; > long do_page_fault(struct pt_regs *); > long hash__do_page_fault(struct pt_regs *); > -extern void bad_page_fault(struct pt_regs *, unsigned long, int); > +void bad_page_fault(struct pt_regs *, int); > extern void _exception(int, struct pt_regs *, int, unsigned long); > extern void _exception_pkey(struct pt_regs *, unsigned long, int); > extern void die(const char *, struct pt_regs *, long); > diff --git a/arch/powerpc/include/asm/debug.h b/arch/powerpc/include/asm/debug.h > index ec57daf87f40..0550eceab3ca 100644 > --- a/arch/powerpc/include/asm/debug.h > +++ b/arch/powerpc/include/asm/debug.h > @@ -52,8 +52,7 @@ extern void do_send_trap(struct pt_regs *regs, unsigned long address, > unsigned long error_code, int brkpt); > #else > > -extern void do_break(struct pt_regs *regs, unsigned long address, > - unsigned long error_code); > +void do_break(struct pt_regs *regs); > #endif > > #endif /* _ASM_POWERPC_DEBUG_H */ > diff --git a/arch/powerpc/kernel/entry_32.S b/arch/powerpc/kernel/entry_32.S > index 8cdc8bcde703..57b8e95ea2a0 100644 > --- a/arch/powerpc/kernel/entry_32.S > +++ b/arch/powerpc/kernel/entry_32.S > @@ -657,10 +657,6 @@ ppc_swapcontext: > .globl handle_page_fault > handle_page_fault: > addi r3,r1,STACK_FRAME_OVERHEAD > -#ifdef CONFIG_PPC_BOOK3S_32 > - andis. r0,r5,DSISR_DABRMATCH@h > - bne- handle_dabr_fault > -#endif > bl do_page_fault > cmpwi r3,0 > beq+ ret_from_except > @@ -668,23 +664,11 @@ handle_page_fault: > lwz r0,_TRAP(r1) > clrrwi r0,r0,1 > stw r0,_TRAP(r1) > - mr r5,r3 > + mr r4,r3 /* err arg for bad_page_fault */ > addi r3,r1,STACK_FRAME_OVERHEAD > - lwz r4,_DAR(r1) > bl bad_page_fault > b ret_from_except_full > > -#ifdef CONFIG_PPC_BOOK3S_32 > - /* We have a data breakpoint exception - handle it */ > -handle_dabr_fault: > - SAVE_NVGPRS(r1) > - lwz r0,_TRAP(r1) > - clrrwi r0,r0,1 > - stw r0,_TRAP(r1) > - bl do_break > - b ret_from_except_full > -#endif > - > /* > * This routine switches between two different tasks. The process > * state of one is saved on its kernel stack. Then the state > diff --git a/arch/powerpc/kernel/exceptions-64e.S b/arch/powerpc/kernel/exceptions-64e.S > index 25fa7d5a643c..dc728bb1c89a 100644 > --- a/arch/powerpc/kernel/exceptions-64e.S > +++ b/arch/powerpc/kernel/exceptions-64e.S > @@ -1018,9 +1018,8 @@ storage_fault_common: > bne- 1f > b ret_from_except_lite > 1: bl save_nvgprs > - mr r5,r3 > + mr r4,r3 > addi r3,r1,STACK_FRAME_OVERHEAD > - ld r4,_DAR(r1) > bl bad_page_fault > b ret_from_except > > diff --git a/arch/powerpc/kernel/exceptions-64s.S b/arch/powerpc/kernel/exceptions-64s.S > index 690058043b17..77b730f515c4 100644 > --- a/arch/powerpc/kernel/exceptions-64s.S > +++ b/arch/powerpc/kernel/exceptions-64s.S > @@ -2136,8 +2136,7 @@ EXC_COMMON_BEGIN(h_data_storage_common) > GEN_COMMON h_data_storage > addi r3,r1,STACK_FRAME_OVERHEAD > BEGIN_MMU_FTR_SECTION > - ld r4,_DAR(r1) > - li r5,SIGSEGV > + li r4,SIGSEGV > bl bad_page_fault > MMU_FTR_SECTION_ELSE > bl unknown_exception > diff --git a/arch/powerpc/kernel/head_8xx.S b/arch/powerpc/kernel/head_8xx.S > index 8acd365a2be6..71ad7ce28469 100644 > --- a/arch/powerpc/kernel/head_8xx.S > +++ b/arch/powerpc/kernel/head_8xx.S > @@ -376,10 +376,9 @@ do_databreakpoint: > addi r3,r1,STACK_FRAME_OVERHEAD > mfspr r4,SPRN_BAR > stw r4,_DAR(r11) > -#ifdef CONFIG_VMAP_STACK > - lwz r5,_DSISR(r11) > -#else > +#ifndef CONFIG_VMAP_STACK > mfspr r5,SPRN_DSISR > + stw r5,_DSISR(r11) > #endif > EXC_XFER_STD(0x1c00, do_break) > > diff --git a/arch/powerpc/kernel/head_book3s_32.S b/arch/powerpc/kernel/head_book3s_32.S > index 7addf67832f9..5875f8795d5b 100644 > --- a/arch/powerpc/kernel/head_book3s_32.S > +++ b/arch/powerpc/kernel/head_book3s_32.S > @@ -689,7 +689,10 @@ handle_page_fault_tramp_1: > #endif > /* fall through */ > handle_page_fault_tramp_2: > + andis. r0, r5, DSISR_DABRMATCH@h > + bne- 1f > EXC_XFER_LITE(0x300, handle_page_fault) > +1: EXC_XFER_STD(0x300, do_break) > > #ifdef CONFIG_VMAP_STACK > .macro save_regs_thread thread > diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c > index d421a2c7f822..0bdd3ed653df 100644 > --- a/arch/powerpc/kernel/process.c > +++ b/arch/powerpc/kernel/process.c > @@ -660,11 +660,10 @@ static void do_break_handler(struct pt_regs *regs) > } > } > > -void do_break (struct pt_regs *regs, unsigned long address, > - unsigned long error_code) > +void do_break(struct pt_regs *regs) > { > current->thread.trap_nr = TRAP_HWBKPT; > - if (notify_die(DIE_DABR_MATCH, "dabr_match", regs, error_code, > + if (notify_die(DIE_DABR_MATCH, "dabr_match", regs, regs->dsisr, > 11, SIGSEGV) == NOTIFY_STOP) > return; > > @@ -682,7 +681,7 @@ void do_break (struct pt_regs *regs, unsigned long address, > do_break_handler(regs); > > /* Deliver the signal to userspace */ > - force_sig_fault(SIGTRAP, TRAP_HWBKPT, (void __user *)address); > + force_sig_fault(SIGTRAP, TRAP_HWBKPT, (void __user *)regs->dar); > } > #endif /* CONFIG_PPC_ADV_DEBUG_REGS */ > > diff --git a/arch/powerpc/kernel/traps.c b/arch/powerpc/kernel/traps.c > index 5006dcbe1d9f..902fcbd1a778 100644 > --- a/arch/powerpc/kernel/traps.c > +++ b/arch/powerpc/kernel/traps.c > @@ -1641,7 +1641,7 @@ void alignment_exception(struct pt_regs *regs) > if (user_mode(regs)) > _exception(sig, regs, code, regs->dar); > else > - bad_page_fault(regs, regs->dar, sig); > + bad_page_fault(regs, sig); > > bail: > exception_exit(prev_state); > diff --git a/arch/powerpc/mm/book3s64/hash_utils.c b/arch/powerpc/mm/book3s64/hash_utils.c > index 0f0bd4af4b2d..731518e7d56f 100644 > --- a/arch/powerpc/mm/book3s64/hash_utils.c > +++ b/arch/powerpc/mm/book3s64/hash_utils.c > @@ -1537,7 +1537,7 @@ long do_hash_fault(struct pt_regs *regs) > * the access, or panic if there isn't a handler. > */ > if (unlikely(in_nmi())) { > - bad_page_fault(regs, ea, SIGSEGV); > + bad_page_fault(regs, SIGSEGV); > return 0; > } > > @@ -1576,7 +1576,7 @@ long do_hash_fault(struct pt_regs *regs) > else > _exception(SIGBUS, regs, BUS_ADRERR, ea); > } else { > - bad_page_fault(regs, ea, SIGBUS); > + bad_page_fault(regs, SIGBUS); > } > err = 0; > > diff --git a/arch/powerpc/mm/book3s64/slb.c b/arch/powerpc/mm/book3s64/slb.c > index cc34d50874c1..ae89ad516247 100644 > --- a/arch/powerpc/mm/book3s64/slb.c > +++ b/arch/powerpc/mm/book3s64/slb.c > @@ -898,7 +898,7 @@ void do_bad_slb_fault(struct pt_regs *regs) > if (user_mode(regs)) > _exception(SIGSEGV, regs, SEGV_BNDERR, regs->dar); > else > - bad_page_fault(regs, regs->dar, SIGSEGV); > + bad_page_fault(regs, SIGSEGV); > } else if (err == -EINVAL) { > unrecoverable_exception(regs); > } else { > diff --git a/arch/powerpc/mm/fault.c b/arch/powerpc/mm/fault.c > index 390a296b16a3..e11989be8f1c 100644 > --- a/arch/powerpc/mm/fault.c > +++ b/arch/powerpc/mm/fault.c > @@ -562,14 +562,14 @@ long do_page_fault(struct pt_regs *regs) > /* 32 and 64e handle errors in their asm code */ > if (unlikely(err)) { > if (err > 0) { > - bad_page_fault(regs, address, err); > + bad_page_fault(regs, err); > err = 0; > } else { > /* > * do_break() may change NV GPRS while handling the > * breakpoint. Return -ve to caller to do that. > */ > - do_break(regs, address, error_code); > + do_break(regs); > } > } > #endif > @@ -591,14 +591,14 @@ long hash__do_page_fault(struct pt_regs *regs) > err = __do_page_fault(regs, address, error_code); > if (unlikely(err)) { > if (err > 0) { > - bad_page_fault(regs, address, err); > + bad_page_fault(regs, err); > err = 0; > } else { > /* > * do_break() may change NV GPRS while handling the > * breakpoint. Return -ve to caller to do that. > */ > - do_break(regs, address, error_code); > + do_break(regs); > } > } > > @@ -612,7 +612,7 @@ NOKPROBE_SYMBOL(hash__do_page_fault); > * It is called from the DSI and ISI handlers in head.S and from some > * of the procedures in traps.c. > */ > -void bad_page_fault(struct pt_regs *regs, unsigned long address, int sig) > +void bad_page_fault(struct pt_regs *regs, int sig) > { > const struct exception_table_entry *entry; > int is_write = page_fault_is_write(regs->dsisr); > diff --git a/arch/powerpc/platforms/8xx/machine_check.c b/arch/powerpc/platforms/8xx/machine_check.c > index 88dedf38eccd..656365975895 100644 > --- a/arch/powerpc/platforms/8xx/machine_check.c > +++ b/arch/powerpc/platforms/8xx/machine_check.c > @@ -26,7 +26,7 @@ int machine_check_8xx(struct pt_regs *regs) > * to deal with that than having a wart in the mcheck handler. > * -- BenH > */ > - bad_page_fault(regs, regs->dar, SIGBUS); > + bad_page_fault(regs, SIGBUS); > return 1; > #else > return 0; > -- > 2.23.0
Le 28/11/2020 à 15:40, Nicholas Piggin a écrit : > Similar to the previous patch this makes interrupt handler function > types more regular so they can be wrapped with the next patch. > > bad_page_fault and do_break are not performance critical. I partly took your changes into one of my series, in different order though. Please have a look at https://patchwork.ozlabs.org/project/linuxppc-dev/list/?series=221656 patches 4 to 7 I think some of the changes are missing in your series, especially the changes in entry_32.S from patch 7. Will see how our two series make their way into mainline, yours needs rebase anyway. Christophe > > [32s DABR code from Christophe Leroy <christophe.leroy@csgroup.eu>] > Signed-off-by: Nicholas Piggin <npiggin@gmail.com> > --- > arch/powerpc/include/asm/bug.h | 2 +- > arch/powerpc/include/asm/debug.h | 3 +-- > arch/powerpc/kernel/entry_32.S | 18 +----------------- > arch/powerpc/kernel/exceptions-64e.S | 3 +-- > arch/powerpc/kernel/exceptions-64s.S | 3 +-- > arch/powerpc/kernel/head_8xx.S | 5 ++--- > arch/powerpc/kernel/head_book3s_32.S | 3 +++ > arch/powerpc/kernel/process.c | 7 +++---- > arch/powerpc/kernel/traps.c | 2 +- > arch/powerpc/mm/book3s64/hash_utils.c | 4 ++-- > arch/powerpc/mm/book3s64/slb.c | 2 +- > arch/powerpc/mm/fault.c | 10 +++++----- > arch/powerpc/platforms/8xx/machine_check.c | 2 +- > 13 files changed, 23 insertions(+), 41 deletions(-) > > diff --git a/arch/powerpc/include/asm/bug.h b/arch/powerpc/include/asm/bug.h > index 897bad6b6bbb..49162faba33f 100644 > --- a/arch/powerpc/include/asm/bug.h > +++ b/arch/powerpc/include/asm/bug.h > @@ -113,7 +113,7 @@ > struct pt_regs; > long do_page_fault(struct pt_regs *); > long hash__do_page_fault(struct pt_regs *); > -extern void bad_page_fault(struct pt_regs *, unsigned long, int); > +void bad_page_fault(struct pt_regs *, int); > extern void _exception(int, struct pt_regs *, int, unsigned long); > extern void _exception_pkey(struct pt_regs *, unsigned long, int); > extern void die(const char *, struct pt_regs *, long); > diff --git a/arch/powerpc/include/asm/debug.h b/arch/powerpc/include/asm/debug.h > index ec57daf87f40..0550eceab3ca 100644 > --- a/arch/powerpc/include/asm/debug.h > +++ b/arch/powerpc/include/asm/debug.h > @@ -52,8 +52,7 @@ extern void do_send_trap(struct pt_regs *regs, unsigned long address, > unsigned long error_code, int brkpt); > #else > > -extern void do_break(struct pt_regs *regs, unsigned long address, > - unsigned long error_code); > +void do_break(struct pt_regs *regs); > #endif > > #endif /* _ASM_POWERPC_DEBUG_H */ > diff --git a/arch/powerpc/kernel/entry_32.S b/arch/powerpc/kernel/entry_32.S > index 8cdc8bcde703..57b8e95ea2a0 100644 > --- a/arch/powerpc/kernel/entry_32.S > +++ b/arch/powerpc/kernel/entry_32.S > @@ -657,10 +657,6 @@ ppc_swapcontext: > .globl handle_page_fault > handle_page_fault: > addi r3,r1,STACK_FRAME_OVERHEAD > -#ifdef CONFIG_PPC_BOOK3S_32 > - andis. r0,r5,DSISR_DABRMATCH@h > - bne- handle_dabr_fault > -#endif > bl do_page_fault > cmpwi r3,0 > beq+ ret_from_except > @@ -668,23 +664,11 @@ handle_page_fault: > lwz r0,_TRAP(r1) > clrrwi r0,r0,1 > stw r0,_TRAP(r1) > - mr r5,r3 > + mr r4,r3 /* err arg for bad_page_fault */ > addi r3,r1,STACK_FRAME_OVERHEAD > - lwz r4,_DAR(r1) > bl bad_page_fault > b ret_from_except_full > > -#ifdef CONFIG_PPC_BOOK3S_32 > - /* We have a data breakpoint exception - handle it */ > -handle_dabr_fault: > - SAVE_NVGPRS(r1) > - lwz r0,_TRAP(r1) > - clrrwi r0,r0,1 > - stw r0,_TRAP(r1) > - bl do_break > - b ret_from_except_full > -#endif > - > /* > * This routine switches between two different tasks. The process > * state of one is saved on its kernel stack. Then the state > diff --git a/arch/powerpc/kernel/exceptions-64e.S b/arch/powerpc/kernel/exceptions-64e.S > index 25fa7d5a643c..dc728bb1c89a 100644 > --- a/arch/powerpc/kernel/exceptions-64e.S > +++ b/arch/powerpc/kernel/exceptions-64e.S > @@ -1018,9 +1018,8 @@ storage_fault_common: > bne- 1f > b ret_from_except_lite > 1: bl save_nvgprs > - mr r5,r3 > + mr r4,r3 > addi r3,r1,STACK_FRAME_OVERHEAD > - ld r4,_DAR(r1) > bl bad_page_fault > b ret_from_except > > diff --git a/arch/powerpc/kernel/exceptions-64s.S b/arch/powerpc/kernel/exceptions-64s.S > index 690058043b17..77b730f515c4 100644 > --- a/arch/powerpc/kernel/exceptions-64s.S > +++ b/arch/powerpc/kernel/exceptions-64s.S > @@ -2136,8 +2136,7 @@ EXC_COMMON_BEGIN(h_data_storage_common) > GEN_COMMON h_data_storage > addi r3,r1,STACK_FRAME_OVERHEAD > BEGIN_MMU_FTR_SECTION > - ld r4,_DAR(r1) > - li r5,SIGSEGV > + li r4,SIGSEGV > bl bad_page_fault > MMU_FTR_SECTION_ELSE > bl unknown_exception > diff --git a/arch/powerpc/kernel/head_8xx.S b/arch/powerpc/kernel/head_8xx.S > index 8acd365a2be6..71ad7ce28469 100644 > --- a/arch/powerpc/kernel/head_8xx.S > +++ b/arch/powerpc/kernel/head_8xx.S > @@ -376,10 +376,9 @@ do_databreakpoint: > addi r3,r1,STACK_FRAME_OVERHEAD > mfspr r4,SPRN_BAR > stw r4,_DAR(r11) > -#ifdef CONFIG_VMAP_STACK > - lwz r5,_DSISR(r11) > -#else > +#ifndef CONFIG_VMAP_STACK > mfspr r5,SPRN_DSISR > + stw r5,_DSISR(r11) > #endif > EXC_XFER_STD(0x1c00, do_break) > > diff --git a/arch/powerpc/kernel/head_book3s_32.S b/arch/powerpc/kernel/head_book3s_32.S > index 7addf67832f9..5875f8795d5b 100644 > --- a/arch/powerpc/kernel/head_book3s_32.S > +++ b/arch/powerpc/kernel/head_book3s_32.S > @@ -689,7 +689,10 @@ handle_page_fault_tramp_1: > #endif > /* fall through */ > handle_page_fault_tramp_2: > + andis. r0, r5, DSISR_DABRMATCH@h > + bne- 1f > EXC_XFER_LITE(0x300, handle_page_fault) > +1: EXC_XFER_STD(0x300, do_break) > > #ifdef CONFIG_VMAP_STACK > .macro save_regs_thread thread > diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c > index d421a2c7f822..0bdd3ed653df 100644 > --- a/arch/powerpc/kernel/process.c > +++ b/arch/powerpc/kernel/process.c > @@ -660,11 +660,10 @@ static void do_break_handler(struct pt_regs *regs) > } > } > > -void do_break (struct pt_regs *regs, unsigned long address, > - unsigned long error_code) > +void do_break(struct pt_regs *regs) > { > current->thread.trap_nr = TRAP_HWBKPT; > - if (notify_die(DIE_DABR_MATCH, "dabr_match", regs, error_code, > + if (notify_die(DIE_DABR_MATCH, "dabr_match", regs, regs->dsisr, > 11, SIGSEGV) == NOTIFY_STOP) > return; > > @@ -682,7 +681,7 @@ void do_break (struct pt_regs *regs, unsigned long address, > do_break_handler(regs); > > /* Deliver the signal to userspace */ > - force_sig_fault(SIGTRAP, TRAP_HWBKPT, (void __user *)address); > + force_sig_fault(SIGTRAP, TRAP_HWBKPT, (void __user *)regs->dar); > } > #endif /* CONFIG_PPC_ADV_DEBUG_REGS */ > > diff --git a/arch/powerpc/kernel/traps.c b/arch/powerpc/kernel/traps.c > index 5006dcbe1d9f..902fcbd1a778 100644 > --- a/arch/powerpc/kernel/traps.c > +++ b/arch/powerpc/kernel/traps.c > @@ -1641,7 +1641,7 @@ void alignment_exception(struct pt_regs *regs) > if (user_mode(regs)) > _exception(sig, regs, code, regs->dar); > else > - bad_page_fault(regs, regs->dar, sig); > + bad_page_fault(regs, sig); > > bail: > exception_exit(prev_state); > diff --git a/arch/powerpc/mm/book3s64/hash_utils.c b/arch/powerpc/mm/book3s64/hash_utils.c > index 0f0bd4af4b2d..731518e7d56f 100644 > --- a/arch/powerpc/mm/book3s64/hash_utils.c > +++ b/arch/powerpc/mm/book3s64/hash_utils.c > @@ -1537,7 +1537,7 @@ long do_hash_fault(struct pt_regs *regs) > * the access, or panic if there isn't a handler. > */ > if (unlikely(in_nmi())) { > - bad_page_fault(regs, ea, SIGSEGV); > + bad_page_fault(regs, SIGSEGV); > return 0; > } > > @@ -1576,7 +1576,7 @@ long do_hash_fault(struct pt_regs *regs) > else > _exception(SIGBUS, regs, BUS_ADRERR, ea); > } else { > - bad_page_fault(regs, ea, SIGBUS); > + bad_page_fault(regs, SIGBUS); > } > err = 0; > > diff --git a/arch/powerpc/mm/book3s64/slb.c b/arch/powerpc/mm/book3s64/slb.c > index cc34d50874c1..ae89ad516247 100644 > --- a/arch/powerpc/mm/book3s64/slb.c > +++ b/arch/powerpc/mm/book3s64/slb.c > @@ -898,7 +898,7 @@ void do_bad_slb_fault(struct pt_regs *regs) > if (user_mode(regs)) > _exception(SIGSEGV, regs, SEGV_BNDERR, regs->dar); > else > - bad_page_fault(regs, regs->dar, SIGSEGV); > + bad_page_fault(regs, SIGSEGV); > } else if (err == -EINVAL) { > unrecoverable_exception(regs); > } else { > diff --git a/arch/powerpc/mm/fault.c b/arch/powerpc/mm/fault.c > index 390a296b16a3..e11989be8f1c 100644 > --- a/arch/powerpc/mm/fault.c > +++ b/arch/powerpc/mm/fault.c > @@ -562,14 +562,14 @@ long do_page_fault(struct pt_regs *regs) > /* 32 and 64e handle errors in their asm code */ > if (unlikely(err)) { > if (err > 0) { > - bad_page_fault(regs, address, err); > + bad_page_fault(regs, err); > err = 0; > } else { > /* > * do_break() may change NV GPRS while handling the > * breakpoint. Return -ve to caller to do that. > */ > - do_break(regs, address, error_code); > + do_break(regs); > } > } > #endif > @@ -591,14 +591,14 @@ long hash__do_page_fault(struct pt_regs *regs) > err = __do_page_fault(regs, address, error_code); > if (unlikely(err)) { > if (err > 0) { > - bad_page_fault(regs, address, err); > + bad_page_fault(regs, err); > err = 0; > } else { > /* > * do_break() may change NV GPRS while handling the > * breakpoint. Return -ve to caller to do that. > */ > - do_break(regs, address, error_code); > + do_break(regs); > } > } > > @@ -612,7 +612,7 @@ NOKPROBE_SYMBOL(hash__do_page_fault); > * It is called from the DSI and ISI handlers in head.S and from some > * of the procedures in traps.c. > */ > -void bad_page_fault(struct pt_regs *regs, unsigned long address, int sig) > +void bad_page_fault(struct pt_regs *regs, int sig) > { > const struct exception_table_entry *entry; > int is_write = page_fault_is_write(regs->dsisr); > diff --git a/arch/powerpc/platforms/8xx/machine_check.c b/arch/powerpc/platforms/8xx/machine_check.c > index 88dedf38eccd..656365975895 100644 > --- a/arch/powerpc/platforms/8xx/machine_check.c > +++ b/arch/powerpc/platforms/8xx/machine_check.c > @@ -26,7 +26,7 @@ int machine_check_8xx(struct pt_regs *regs) > * to deal with that than having a wart in the mcheck handler. > * -- BenH > */ > - bad_page_fault(regs, regs->dar, SIGBUS); > + bad_page_fault(regs, SIGBUS); > return 1; > #else > return 0; >
Excerpts from Christophe Leroy's message of December 23, 2020 12:42 am: > > > Le 28/11/2020 à 15:40, Nicholas Piggin a écrit : >> Similar to the previous patch this makes interrupt handler function >> types more regular so they can be wrapped with the next patch. >> >> bad_page_fault and do_break are not performance critical. > > I partly took your changes into one of my series, in different order though. > > Please have a look at https://patchwork.ozlabs.org/project/linuxppc-dev/list/?series=221656 patches > 4 to 7 Thanks, I had a look. Seems like the result is basically the same as my series, so that's good if you like the end result now :) > I think some of the changes are missing in your series, especially the changes in entry_32.S from > patch 7. Okay I could take them in. In your patch 7/15, why do you leave this load of DSISR? diff --git a/arch/powerpc/kernel/head_book3s_32.S b/arch/powerpc/kernel/head_book3s_32.S index 15e6003fd3b8..0133a02d1d47 100644 --- a/arch/powerpc/kernel/head_book3s_32.S +++ b/arch/powerpc/kernel/head_book3s_32.S @@ -369,9 +369,9 @@ BEGIN_MMU_FTR_SECTION END_MMU_FTR_SECTION_IFSET(MMU_FTR_HPTE_TABLE) #endif #endif /* CONFIG_VMAP_STACK */ -1: mr r4,r12 andis. r5,r9,DSISR_SRR1_MATCH_32S@h /* Filter relevant SRR1 bits */ - stw r4, _DAR(r11) + stw r12, _DAR(r11) + stw r5, _DSISR(r11) EXC_XFER_LITE(0x400, handle_page_fault) /* External interrupt */ @@ -693,7 +693,6 @@ handle_page_fault_tramp_1: #ifdef CONFIG_VMAP_STACK EXCEPTION_PROLOG_2 handle_dar_dsisr=1 #endif - lwz r4, _DAR(r11) lwz r5, _DSISR(r11) ^^^^^^^^^^^^^^^^^^^^^^ /* fall through */ handle_page_fault_tramp_2: ? > Will see how our two series make their way into mainline, yours needs rebase anyway. I have it rebased, just waiting for a bit after merge window to repost. Would be good if mine can go first so I don't have to redo the 64s page fault to C conversion again. AFAIKS after that you can just drop 4-7, no conflicts? (after bugs are fixed) Thanks, Nick
Excerpts from Nicholas Piggin's message of December 26, 2020 6:19 pm: > Excerpts from Christophe Leroy's message of December 23, 2020 12:42 am: >> >> >> Le 28/11/2020 à 15:40, Nicholas Piggin a écrit : >>> Similar to the previous patch this makes interrupt handler function >>> types more regular so they can be wrapped with the next patch. >>> >>> bad_page_fault and do_break are not performance critical. >> >> I partly took your changes into one of my series, in different order though. >> >> Please have a look at https://patchwork.ozlabs.org/project/linuxppc-dev/list/?series=221656 patches >> 4 to 7 > > Thanks, I had a look. Seems like the result is basically the same as my > series, so that's good if you like the end result now :) > >> I think some of the changes are missing in your series, especially the changes in entry_32.S from >> patch 7. > > Okay I could take them in. In your patch 7/15, why do you leave this > load of DSISR? > > diff --git a/arch/powerpc/kernel/head_book3s_32.S b/arch/powerpc/kernel/head_book3s_32.S > index 15e6003fd3b8..0133a02d1d47 100644 > --- a/arch/powerpc/kernel/head_book3s_32.S > +++ b/arch/powerpc/kernel/head_book3s_32.S > @@ -369,9 +369,9 @@ BEGIN_MMU_FTR_SECTION > END_MMU_FTR_SECTION_IFSET(MMU_FTR_HPTE_TABLE) > #endif > #endif /* CONFIG_VMAP_STACK */ > -1: mr r4,r12 > andis. r5,r9,DSISR_SRR1_MATCH_32S@h /* Filter relevant SRR1 bits */ > - stw r4, _DAR(r11) > + stw r12, _DAR(r11) > + stw r5, _DSISR(r11) > EXC_XFER_LITE(0x400, handle_page_fault) > > /* External interrupt */ > @@ -693,7 +693,6 @@ handle_page_fault_tramp_1: > #ifdef CONFIG_VMAP_STACK > EXCEPTION_PROLOG_2 handle_dar_dsisr=1 > #endif > - lwz r4, _DAR(r11) > lwz r5, _DSISR(r11) > ^^^^^^^^^^^^^^^^^^^^^^ > /* fall through */ > handle_page_fault_tramp_2: > > ? Ah never mind, this needs to come back after your DABR match move patch, which you have earlier in the series. I confused myself. I'll rebase my series on your patch 4 rather than have it squashed in with other do_break stuff. Thanks, Nick
diff --git a/arch/powerpc/include/asm/bug.h b/arch/powerpc/include/asm/bug.h index 897bad6b6bbb..49162faba33f 100644 --- a/arch/powerpc/include/asm/bug.h +++ b/arch/powerpc/include/asm/bug.h @@ -113,7 +113,7 @@ struct pt_regs; long do_page_fault(struct pt_regs *); long hash__do_page_fault(struct pt_regs *); -extern void bad_page_fault(struct pt_regs *, unsigned long, int); +void bad_page_fault(struct pt_regs *, int); extern void _exception(int, struct pt_regs *, int, unsigned long); extern void _exception_pkey(struct pt_regs *, unsigned long, int); extern void die(const char *, struct pt_regs *, long); diff --git a/arch/powerpc/include/asm/debug.h b/arch/powerpc/include/asm/debug.h index ec57daf87f40..0550eceab3ca 100644 --- a/arch/powerpc/include/asm/debug.h +++ b/arch/powerpc/include/asm/debug.h @@ -52,8 +52,7 @@ extern void do_send_trap(struct pt_regs *regs, unsigned long address, unsigned long error_code, int brkpt); #else -extern void do_break(struct pt_regs *regs, unsigned long address, - unsigned long error_code); +void do_break(struct pt_regs *regs); #endif #endif /* _ASM_POWERPC_DEBUG_H */ diff --git a/arch/powerpc/kernel/entry_32.S b/arch/powerpc/kernel/entry_32.S index 8cdc8bcde703..57b8e95ea2a0 100644 --- a/arch/powerpc/kernel/entry_32.S +++ b/arch/powerpc/kernel/entry_32.S @@ -657,10 +657,6 @@ ppc_swapcontext: .globl handle_page_fault handle_page_fault: addi r3,r1,STACK_FRAME_OVERHEAD -#ifdef CONFIG_PPC_BOOK3S_32 - andis. r0,r5,DSISR_DABRMATCH@h - bne- handle_dabr_fault -#endif bl do_page_fault cmpwi r3,0 beq+ ret_from_except @@ -668,23 +664,11 @@ handle_page_fault: lwz r0,_TRAP(r1) clrrwi r0,r0,1 stw r0,_TRAP(r1) - mr r5,r3 + mr r4,r3 /* err arg for bad_page_fault */ addi r3,r1,STACK_FRAME_OVERHEAD - lwz r4,_DAR(r1) bl bad_page_fault b ret_from_except_full -#ifdef CONFIG_PPC_BOOK3S_32 - /* We have a data breakpoint exception - handle it */ -handle_dabr_fault: - SAVE_NVGPRS(r1) - lwz r0,_TRAP(r1) - clrrwi r0,r0,1 - stw r0,_TRAP(r1) - bl do_break - b ret_from_except_full -#endif - /* * This routine switches between two different tasks. The process * state of one is saved on its kernel stack. Then the state diff --git a/arch/powerpc/kernel/exceptions-64e.S b/arch/powerpc/kernel/exceptions-64e.S index 25fa7d5a643c..dc728bb1c89a 100644 --- a/arch/powerpc/kernel/exceptions-64e.S +++ b/arch/powerpc/kernel/exceptions-64e.S @@ -1018,9 +1018,8 @@ storage_fault_common: bne- 1f b ret_from_except_lite 1: bl save_nvgprs - mr r5,r3 + mr r4,r3 addi r3,r1,STACK_FRAME_OVERHEAD - ld r4,_DAR(r1) bl bad_page_fault b ret_from_except diff --git a/arch/powerpc/kernel/exceptions-64s.S b/arch/powerpc/kernel/exceptions-64s.S index 690058043b17..77b730f515c4 100644 --- a/arch/powerpc/kernel/exceptions-64s.S +++ b/arch/powerpc/kernel/exceptions-64s.S @@ -2136,8 +2136,7 @@ EXC_COMMON_BEGIN(h_data_storage_common) GEN_COMMON h_data_storage addi r3,r1,STACK_FRAME_OVERHEAD BEGIN_MMU_FTR_SECTION - ld r4,_DAR(r1) - li r5,SIGSEGV + li r4,SIGSEGV bl bad_page_fault MMU_FTR_SECTION_ELSE bl unknown_exception diff --git a/arch/powerpc/kernel/head_8xx.S b/arch/powerpc/kernel/head_8xx.S index 8acd365a2be6..71ad7ce28469 100644 --- a/arch/powerpc/kernel/head_8xx.S +++ b/arch/powerpc/kernel/head_8xx.S @@ -376,10 +376,9 @@ do_databreakpoint: addi r3,r1,STACK_FRAME_OVERHEAD mfspr r4,SPRN_BAR stw r4,_DAR(r11) -#ifdef CONFIG_VMAP_STACK - lwz r5,_DSISR(r11) -#else +#ifndef CONFIG_VMAP_STACK mfspr r5,SPRN_DSISR + stw r5,_DSISR(r11) #endif EXC_XFER_STD(0x1c00, do_break) diff --git a/arch/powerpc/kernel/head_book3s_32.S b/arch/powerpc/kernel/head_book3s_32.S index 7addf67832f9..5875f8795d5b 100644 --- a/arch/powerpc/kernel/head_book3s_32.S +++ b/arch/powerpc/kernel/head_book3s_32.S @@ -689,7 +689,10 @@ handle_page_fault_tramp_1: #endif /* fall through */ handle_page_fault_tramp_2: + andis. r0, r5, DSISR_DABRMATCH@h + bne- 1f EXC_XFER_LITE(0x300, handle_page_fault) +1: EXC_XFER_STD(0x300, do_break) #ifdef CONFIG_VMAP_STACK .macro save_regs_thread thread diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c index d421a2c7f822..0bdd3ed653df 100644 --- a/arch/powerpc/kernel/process.c +++ b/arch/powerpc/kernel/process.c @@ -660,11 +660,10 @@ static void do_break_handler(struct pt_regs *regs) } } -void do_break (struct pt_regs *regs, unsigned long address, - unsigned long error_code) +void do_break(struct pt_regs *regs) { current->thread.trap_nr = TRAP_HWBKPT; - if (notify_die(DIE_DABR_MATCH, "dabr_match", regs, error_code, + if (notify_die(DIE_DABR_MATCH, "dabr_match", regs, regs->dsisr, 11, SIGSEGV) == NOTIFY_STOP) return; @@ -682,7 +681,7 @@ void do_break (struct pt_regs *regs, unsigned long address, do_break_handler(regs); /* Deliver the signal to userspace */ - force_sig_fault(SIGTRAP, TRAP_HWBKPT, (void __user *)address); + force_sig_fault(SIGTRAP, TRAP_HWBKPT, (void __user *)regs->dar); } #endif /* CONFIG_PPC_ADV_DEBUG_REGS */ diff --git a/arch/powerpc/kernel/traps.c b/arch/powerpc/kernel/traps.c index 5006dcbe1d9f..902fcbd1a778 100644 --- a/arch/powerpc/kernel/traps.c +++ b/arch/powerpc/kernel/traps.c @@ -1641,7 +1641,7 @@ void alignment_exception(struct pt_regs *regs) if (user_mode(regs)) _exception(sig, regs, code, regs->dar); else - bad_page_fault(regs, regs->dar, sig); + bad_page_fault(regs, sig); bail: exception_exit(prev_state); diff --git a/arch/powerpc/mm/book3s64/hash_utils.c b/arch/powerpc/mm/book3s64/hash_utils.c index 0f0bd4af4b2d..731518e7d56f 100644 --- a/arch/powerpc/mm/book3s64/hash_utils.c +++ b/arch/powerpc/mm/book3s64/hash_utils.c @@ -1537,7 +1537,7 @@ long do_hash_fault(struct pt_regs *regs) * the access, or panic if there isn't a handler. */ if (unlikely(in_nmi())) { - bad_page_fault(regs, ea, SIGSEGV); + bad_page_fault(regs, SIGSEGV); return 0; } @@ -1576,7 +1576,7 @@ long do_hash_fault(struct pt_regs *regs) else _exception(SIGBUS, regs, BUS_ADRERR, ea); } else { - bad_page_fault(regs, ea, SIGBUS); + bad_page_fault(regs, SIGBUS); } err = 0; diff --git a/arch/powerpc/mm/book3s64/slb.c b/arch/powerpc/mm/book3s64/slb.c index cc34d50874c1..ae89ad516247 100644 --- a/arch/powerpc/mm/book3s64/slb.c +++ b/arch/powerpc/mm/book3s64/slb.c @@ -898,7 +898,7 @@ void do_bad_slb_fault(struct pt_regs *regs) if (user_mode(regs)) _exception(SIGSEGV, regs, SEGV_BNDERR, regs->dar); else - bad_page_fault(regs, regs->dar, SIGSEGV); + bad_page_fault(regs, SIGSEGV); } else if (err == -EINVAL) { unrecoverable_exception(regs); } else { diff --git a/arch/powerpc/mm/fault.c b/arch/powerpc/mm/fault.c index 390a296b16a3..e11989be8f1c 100644 --- a/arch/powerpc/mm/fault.c +++ b/arch/powerpc/mm/fault.c @@ -562,14 +562,14 @@ long do_page_fault(struct pt_regs *regs) /* 32 and 64e handle errors in their asm code */ if (unlikely(err)) { if (err > 0) { - bad_page_fault(regs, address, err); + bad_page_fault(regs, err); err = 0; } else { /* * do_break() may change NV GPRS while handling the * breakpoint. Return -ve to caller to do that. */ - do_break(regs, address, error_code); + do_break(regs); } } #endif @@ -591,14 +591,14 @@ long hash__do_page_fault(struct pt_regs *regs) err = __do_page_fault(regs, address, error_code); if (unlikely(err)) { if (err > 0) { - bad_page_fault(regs, address, err); + bad_page_fault(regs, err); err = 0; } else { /* * do_break() may change NV GPRS while handling the * breakpoint. Return -ve to caller to do that. */ - do_break(regs, address, error_code); + do_break(regs); } } @@ -612,7 +612,7 @@ NOKPROBE_SYMBOL(hash__do_page_fault); * It is called from the DSI and ISI handlers in head.S and from some * of the procedures in traps.c. */ -void bad_page_fault(struct pt_regs *regs, unsigned long address, int sig) +void bad_page_fault(struct pt_regs *regs, int sig) { const struct exception_table_entry *entry; int is_write = page_fault_is_write(regs->dsisr); diff --git a/arch/powerpc/platforms/8xx/machine_check.c b/arch/powerpc/platforms/8xx/machine_check.c index 88dedf38eccd..656365975895 100644 --- a/arch/powerpc/platforms/8xx/machine_check.c +++ b/arch/powerpc/platforms/8xx/machine_check.c @@ -26,7 +26,7 @@ int machine_check_8xx(struct pt_regs *regs) * to deal with that than having a wart in the mcheck handler. * -- BenH */ - bad_page_fault(regs, regs->dar, SIGBUS); + bad_page_fault(regs, SIGBUS); return 1; #else return 0;
Similar to the previous patch this makes interrupt handler function types more regular so they can be wrapped with the next patch. bad_page_fault and do_break are not performance critical. [32s DABR code from Christophe Leroy <christophe.leroy@csgroup.eu>] Signed-off-by: Nicholas Piggin <npiggin@gmail.com> --- arch/powerpc/include/asm/bug.h | 2 +- arch/powerpc/include/asm/debug.h | 3 +-- arch/powerpc/kernel/entry_32.S | 18 +----------------- arch/powerpc/kernel/exceptions-64e.S | 3 +-- arch/powerpc/kernel/exceptions-64s.S | 3 +-- arch/powerpc/kernel/head_8xx.S | 5 ++--- arch/powerpc/kernel/head_book3s_32.S | 3 +++ arch/powerpc/kernel/process.c | 7 +++---- arch/powerpc/kernel/traps.c | 2 +- arch/powerpc/mm/book3s64/hash_utils.c | 4 ++-- arch/powerpc/mm/book3s64/slb.c | 2 +- arch/powerpc/mm/fault.c | 10 +++++----- arch/powerpc/platforms/8xx/machine_check.c | 2 +- 13 files changed, 23 insertions(+), 41 deletions(-)