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| author |  Nicholas Piggin <npiggin@gmail.com>
| 2021-06-30 17:46:15 +1000 |
|---|---|---|
| committer |  Michael Ellerman <mpe@ellerman.id.au>
| 2021-06-30 22:21:20 +1000 |
| commit | 9b69d48c7516a29cdaacd18d8bf5f575014a42a1 (patch) | |
| tree | 8f685003f411a16b2988ad2de904be45ee094a7e /arch/powerpc/kernel/interrupt_64.S | |
| parent | powerpc/64e: fix CONFIG_RELOCATABLE build warnings (diff) | |
| download | linux-9b69d48c7516a29cdaacd18d8bf5f575014a42a1.tar.gz linux-9b69d48c7516a29cdaacd18d8bf5f575014a42a1.tar.bz2 linux-9b69d48c7516a29cdaacd18d8bf5f575014a42a1.zip | |
powerpc/64e: remove implicit soft-masking and interrupt exit restart logic
The implicit soft-masking to speed up interrupt return was going to be
used by 64e as well, but it has not been extensively tested on that
platform and is not considered ready. It was intended to be disabled
before merge. Disable it for now.
Most of the restart code is common with 64s, so with more correctness
and performance testing this could be re-enabled again by adding the
extra soft-mask checks to interrupt handlers and flipping
exit_must_hard_disable().
Fixes: 9d1988ca87dd ("powerpc/64: treat low kernel text as irqs soft-masked")
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20210630074621.2109197-4-npiggin@gmail.com
Diffstat (limited to 'arch/powerpc/kernel/interrupt_64.S')
| -rw-r--r-- | arch/powerpc/kernel/interrupt_64.S | 16 |
1 files changed, 14 insertions, 2 deletions
diff --git a/arch/powerpc/kernel/interrupt_64.S b/arch/powerpc/kernel/interrupt_64.S index e7a50613a570..09b8d8846c67 100644 --- a/arch/powerpc/kernel/interrupt_64.S +++ b/arch/powerpc/kernel/interrupt_64.S @@ -231,7 +231,7 @@ _ASM_NOKPROBE_SYMBOL(system_call_vectored_emulate) li r10,IRQS_ALL_DISABLED stb r10,PACAIRQSOFTMASK(r13) b system_call_vectored_common -#endif +#endif /* CONFIG_PPC_BOOK3S */ .balign IFETCH_ALIGN_BYTES .globl system_call_common_real @@ -320,10 +320,12 @@ END_BTB_FLUSH_SECTION li r5,0 /* !scv */ bl syscall_exit_prepare std r1,PACA_EXIT_SAVE_R1(r13) /* save r1 for restart */ +#ifdef CONFIG_PPC_BOOK3S .Lsyscall_rst_start: lbz r11,PACAIRQHAPPENED(r13) andi. r11,r11,(~PACA_IRQ_HARD_DIS)@l bne- syscall_restart +#endif li r11,IRQS_ENABLED stb r11,PACAIRQSOFTMASK(r13) li r11,0 @@ -396,6 +398,7 @@ END_FTR_SECTION_IFSET(CPU_FTR_HAS_PPR) b .Lsyscall_restore_regs_cont .Lsyscall_rst_end: +#ifdef CONFIG_PPC_BOOK3S syscall_restart: GET_PACA(r13) ld r1,PACA_EXIT_SAVE_R1(r13) @@ -409,6 +412,7 @@ syscall_restart: b .Lsyscall_rst_start RESTART_TABLE(.Lsyscall_rst_start, .Lsyscall_rst_end, syscall_restart) +#endif #ifdef CONFIG_PPC_TRANSACTIONAL_MEM tabort_syscall: @@ -504,10 +508,12 @@ _ASM_NOKPROBE_SYMBOL(interrupt_return_\srr\()) bne- .Lrestore_nvgprs_\srr .Lrestore_nvgprs_\srr\()_cont: std r1,PACA_EXIT_SAVE_R1(r13) /* save r1 for restart */ +#ifdef CONFIG_PPC_BOOK3S .Linterrupt_return_\srr\()_user_rst_start: lbz r11,PACAIRQHAPPENED(r13) andi. r11,r11,(~PACA_IRQ_HARD_DIS)@l bne- interrupt_return_\srr\()_user_restart +#endif li r11,IRQS_ENABLED stb r11,PACAIRQSOFTMASK(r13) li r11,0 @@ -590,6 +596,7 @@ ALT_FTR_SECTION_END_IFCLR(CPU_FTR_STCX_CHECKS_ADDRESS) REST_NVGPRS(r1) b .Lrestore_nvgprs_\srr\()_cont +#ifdef CONFIG_PPC_BOOK3S interrupt_return_\srr\()_user_restart: GET_PACA(r13) ld r1,PACA_EXIT_SAVE_R1(r13) @@ -602,6 +609,7 @@ interrupt_return_\srr\()_user_restart: b .Linterrupt_return_\srr\()_user_rst_start RESTART_TABLE(.Linterrupt_return_\srr\()_user_rst_start, .Linterrupt_return_\srr\()_user_rst_end, interrupt_return_\srr\()_user_restart) +#endif .balign IFETCH_ALIGN_BYTES .Lkernel_interrupt_return_\srr\(): @@ -615,9 +623,11 @@ RESTART_TABLE(.Linterrupt_return_\srr\()_user_rst_start, .Linterrupt_return_\srr cmpwi r11,IRQS_ENABLED stb r11,PACAIRQSOFTMASK(r13) bne 1f +#ifdef CONFIG_PPC_BOOK3S lbz r11,PACAIRQHAPPENED(r13) andi. r11,r11,(~PACA_IRQ_HARD_DIS)@l bne- interrupt_return_\srr\()_kernel_restart +#endif li r11,0 stb r11,PACAIRQHAPPENED(r13) # clear out possible HARD_DIS 1: @@ -717,6 +727,7 @@ ALT_FTR_SECTION_END_IFCLR(CPU_FTR_STCX_CHECKS_ADDRESS) b . /* prevent speculative execution */ .Linterrupt_return_\srr\()_kernel_rst_end: +#ifdef CONFIG_PPC_BOOK3S interrupt_return_\srr\()_kernel_restart: GET_PACA(r13) ld r1,PACA_EXIT_SAVE_R1(r13) @@ -729,14 +740,15 @@ interrupt_return_\srr\()_kernel_restart: b .Linterrupt_return_\srr\()_kernel_rst_start RESTART_TABLE(.Linterrupt_return_\srr\()_kernel_rst_start, .Linterrupt_return_\srr\()_kernel_rst_end, interrupt_return_\srr\()_kernel_restart) +#endif .endm interrupt_return_macro srr #ifdef CONFIG_PPC_BOOK3S interrupt_return_macro hsrr -#endif /* CONFIG_PPC_BOOK3S */ .globl __end_soft_masked __end_soft_masked: DEFINE_FIXED_SYMBOL(__end_soft_masked) +#endif /* CONFIG_PPC_BOOK3S */ |