Re: [PATCH v7] powerpc/irq: Inline call_do_irq() and call_do_softirq()
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Nathan Chancellor
Apr 26, 2021, 2:50:32 PM4/26/21
to Michael Ellerman, linuxp...@lists.ozlabs.org, clang-bu...@googlegroups.com
On Sat, Mar 20, 2021 at 11:22:27PM +1100, Michael Ellerman wrote:
> From: Christophe Leroy <christop...@csgroup.eu>
>
> call_do_irq() and call_do_softirq() are simple enough to be
> worth inlining.
>
> Inlining them avoids an mflr/mtlr pair plus a save/reload on stack. It
> also allows GCC to keep the saved ksp_limit in an nonvolatile reg.
>
> This is inspired from S390 arch. Several other arches do more or
> less the same. The way sparc arch does seems odd thought.
>
> Signed-off-by: Christophe Leroy <christop...@csgroup.eu>
> Signed-off-by: Michael Ellerman <m...@ellerman.id.au>
> ---
>
> v2: no change.
> v3: no change.
> v4:
> - comment reminding the purpose of the inline asm block.
> - added r2 as clobbered reg
> v5:
> - Limiting the change to PPC32 for now.
> - removed r2 from the clobbered regs list (on PPC32 r2 points to current all the time)
> - Removed patch 1 and merged ksp_limit handling in here.
> v6:
> - Rebase on top of merge-test (ca6e327fefb2).
> - Remove the ksp_limit stuff as it's doesn't exist anymore.
>
> v7:
> mpe:
> - Enable for 64-bit too. This all in-kernel code calling in-kernel
> code, and must use the kernel TOC.
> - Use named parameters for the inline asm.
> - Reformat inline asm.
> - Mark as always_inline.
> - Drop unused ret from call_do_softirq(), add r3 as clobbered.
> ---
> arch/powerpc/include/asm/irq.h | 2 --
> arch/powerpc/kernel/irq.c | 41 ++++++++++++++++++++++++++++++++++
> arch/powerpc/kernel/misc_32.S | 25 ---------------------
> arch/powerpc/kernel/misc_64.S | 22 ------------------
> 4 files changed, 41 insertions(+), 49 deletions(-)
>
> diff --git a/arch/powerpc/include/asm/irq.h b/arch/powerpc/include/asm/irq.h
> index f3f264e441a7..b2bd58830430 100644
> --- a/arch/powerpc/include/asm/irq.h
> +++ b/arch/powerpc/include/asm/irq.h
> @@ -53,8 +53,6 @@ extern void *mcheckirq_ctx[NR_CPUS];
> extern void *hardirq_ctx[NR_CPUS];
> extern void *softirq_ctx[NR_CPUS];
>
> -void call_do_softirq(void *sp);
> -void call_do_irq(struct pt_regs *regs, void *sp);
> extern void do_IRQ(struct pt_regs *regs);
> extern void __init init_IRQ(void);
> extern void __do_irq(struct pt_regs *regs);
> diff --git a/arch/powerpc/kernel/irq.c b/arch/powerpc/kernel/irq.c
> index 5b72abbff96c..260effc0a435 100644
> --- a/arch/powerpc/kernel/irq.c
> +++ b/arch/powerpc/kernel/irq.c
> @@ -667,6 +667,47 @@ static inline void check_stack_overflow(void)
> }
> }
>
> +static __always_inline void call_do_softirq(const void *sp)
> +{
> + /* Temporarily switch r1 to sp, call __do_softirq() then restore r1. */
> + asm volatile (
> + PPC_STLU " %%r1, %[offset](%[sp]) ;"
> + "mr %%r1, %[sp] ;"
> + "bl %[callee] ;"
> + PPC_LL " %%r1, 0(%%r1) ;"
> + : // Outputs
> + : // Inputs
> + [sp] "b" (sp), [offset] "i" (THREAD_SIZE - STACK_FRAME_OVERHEAD),
> + [callee] "i" (__do_softirq)
> + : // Clobbers
> + "lr", "xer", "ctr", "memory", "cr0", "cr1", "cr5", "cr6",
> + "cr7", "r0", "r3", "r4", "r5", "r6", "r7", "r8", "r9", "r10",
> + "r11", "r12"
> + );
> +}
> +
> +static __always_inline void call_do_irq(struct pt_regs *regs, void *sp)
> +{
> + register unsigned long r3 asm("r3") = (unsigned long)regs;
> +
> + /* Temporarily switch r1 to sp, call __do_irq() then restore r1. */
> + asm volatile (
> + PPC_STLU " %%r1, %[offset](%[sp]) ;"
> + "mr %%r1, %[sp] ;"
> + "bl %[callee] ;"
> + PPC_LL " %%r1, 0(%%r1) ;"
> + : // Outputs
> + "+r" (r3)
> + : // Inputs
> + [sp] "b" (sp), [offset] "i" (THREAD_SIZE - STACK_FRAME_OVERHEAD),
> + [callee] "i" (__do_irq)
> + : // Clobbers
> + "lr", "xer", "ctr", "memory", "cr0", "cr1", "cr5", "cr6",
> + "cr7", "r0", "r4", "r5", "r6", "r7", "r8", "r9", "r10",
> + "r11", "r12"
> + );
> +}
> +
> void __do_irq(struct pt_regs *regs)
> {
> unsigned int irq;
> diff --git a/arch/powerpc/kernel/misc_32.S b/arch/powerpc/kernel/misc_32.S
> index acc410043b96..6a076bef2932 100644
> --- a/arch/powerpc/kernel/misc_32.S
> +++ b/arch/powerpc/kernel/misc_32.S
> @@ -27,31 +27,6 @@
>
> .text
>
> -_GLOBAL(call_do_softirq)
> - mflr r0
> - stw r0,4(r1)
> - stwu r1,THREAD_SIZE-STACK_FRAME_OVERHEAD(r3)
> - mr r1,r3
> - bl __do_softirq
> - lwz r1,0(r1)
> - lwz r0,4(r1)
> - mtlr r0
> - blr
> -
> -/*
> - * void call_do_irq(struct pt_regs *regs, void *sp);
> - */
> -_GLOBAL(call_do_irq)
> - mflr r0
> - stw r0,4(r1)
> - stwu r1,THREAD_SIZE-STACK_FRAME_OVERHEAD(r4)
> - mr r1,r4
> - bl __do_irq
> - lwz r1,0(r1)
> - lwz r0,4(r1)
> - mtlr r0
> - blr
> -
> /*
> * This returns the high 64 bits of the product of two 64-bit numbers.
> */
> diff --git a/arch/powerpc/kernel/misc_64.S b/arch/powerpc/kernel/misc_64.S
> index 070465825c21..4b761a18a74d 100644
> --- a/arch/powerpc/kernel/misc_64.S
> +++ b/arch/powerpc/kernel/misc_64.S
> @@ -27,28 +27,6 @@
>
> .text
>
> -_GLOBAL(call_do_softirq)
> - mflr r0
> - std r0,16(r1)
> - stdu r1,THREAD_SIZE-STACK_FRAME_OVERHEAD(r3)
> - mr r1,r3
> - bl __do_softirq
> - ld r1,0(r1)
> - ld r0,16(r1)
> - mtlr r0
> - blr
> -
> -_GLOBAL(call_do_irq)
> - mflr r0
> - std r0,16(r1)
> - stdu r1,THREAD_SIZE-STACK_FRAME_OVERHEAD(r4)
> - mr r1,r4
> - bl __do_irq
> - ld r1,0(r1)
> - ld r0,16(r1)
> - mtlr r0
> - blr
> -
> _GLOBAL(__bswapdi2)
> EXPORT_SYMBOL(__bswapdi2)
> srdi r8,r3,32
> --
> 2.25.1
>
This change caused our ppc44x_defconfig builds to hang when powering
down in QEMU:
https://github.com/ClangBuiltLinux/continuous-integration2/runs/2304364629?check_suite_focus=true#logs
This is probably something with clang given that GCC 10.3.0 works fine
but due to the nature of the change, I have no idea how to tell what is
going wrong. I tried to do some rudimentary debugging with gdb but that
did not really get me anywhere.
The kernel was built with just 'CC=clang' and it is reproducible with
all versions of clang that the kernel supports.
The QEMU invocation is visible at the link above, it is done with our
boot-qemu.sh in this repo, which also houses the rootfs:
https://github.com/ClangBuiltLinux/boot-utils
Happy to provide any other information or debug/test as directed!
Cheers,
Nathan
> From: Christophe Leroy <christop...@csgroup.eu>
>
> call_do_irq() and call_do_softirq() are simple enough to be
> worth inlining.
>
> Inlining them avoids an mflr/mtlr pair plus a save/reload on stack. It
> also allows GCC to keep the saved ksp_limit in an nonvolatile reg.
>
> This is inspired from S390 arch. Several other arches do more or
> less the same. The way sparc arch does seems odd thought.
>
> Signed-off-by: Christophe Leroy <christop...@csgroup.eu>
> Signed-off-by: Michael Ellerman <m...@ellerman.id.au>
> ---
>
> v2: no change.
> v3: no change.
> v4:
> - comment reminding the purpose of the inline asm block.
> - added r2 as clobbered reg
> v5:
> - Limiting the change to PPC32 for now.
> - removed r2 from the clobbered regs list (on PPC32 r2 points to current all the time)
> - Removed patch 1 and merged ksp_limit handling in here.
> v6:
> - Rebase on top of merge-test (ca6e327fefb2).
> - Remove the ksp_limit stuff as it's doesn't exist anymore.
>
> v7:
> mpe:
> - Enable for 64-bit too. This all in-kernel code calling in-kernel
> code, and must use the kernel TOC.
> - Use named parameters for the inline asm.
> - Reformat inline asm.
> - Mark as always_inline.
> - Drop unused ret from call_do_softirq(), add r3 as clobbered.
> ---
> arch/powerpc/include/asm/irq.h | 2 --
> arch/powerpc/kernel/irq.c | 41 ++++++++++++++++++++++++++++++++++
> arch/powerpc/kernel/misc_32.S | 25 ---------------------
> arch/powerpc/kernel/misc_64.S | 22 ------------------
> 4 files changed, 41 insertions(+), 49 deletions(-)
>
> diff --git a/arch/powerpc/include/asm/irq.h b/arch/powerpc/include/asm/irq.h
> index f3f264e441a7..b2bd58830430 100644
> --- a/arch/powerpc/include/asm/irq.h
> +++ b/arch/powerpc/include/asm/irq.h
> @@ -53,8 +53,6 @@ extern void *mcheckirq_ctx[NR_CPUS];
> extern void *hardirq_ctx[NR_CPUS];
> extern void *softirq_ctx[NR_CPUS];
>
> -void call_do_softirq(void *sp);
> -void call_do_irq(struct pt_regs *regs, void *sp);
> extern void do_IRQ(struct pt_regs *regs);
> extern void __init init_IRQ(void);
> extern void __do_irq(struct pt_regs *regs);
> diff --git a/arch/powerpc/kernel/irq.c b/arch/powerpc/kernel/irq.c
> index 5b72abbff96c..260effc0a435 100644
> --- a/arch/powerpc/kernel/irq.c
> +++ b/arch/powerpc/kernel/irq.c
> @@ -667,6 +667,47 @@ static inline void check_stack_overflow(void)
> }
> }
>
> +static __always_inline void call_do_softirq(const void *sp)
> +{
> + /* Temporarily switch r1 to sp, call __do_softirq() then restore r1. */
> + asm volatile (
> + PPC_STLU " %%r1, %[offset](%[sp]) ;"
> + "mr %%r1, %[sp] ;"
> + "bl %[callee] ;"
> + PPC_LL " %%r1, 0(%%r1) ;"
> + : // Outputs
> + : // Inputs
> + [sp] "b" (sp), [offset] "i" (THREAD_SIZE - STACK_FRAME_OVERHEAD),
> + [callee] "i" (__do_softirq)
> + : // Clobbers
> + "lr", "xer", "ctr", "memory", "cr0", "cr1", "cr5", "cr6",
> + "cr7", "r0", "r3", "r4", "r5", "r6", "r7", "r8", "r9", "r10",
> + "r11", "r12"
> + );
> +}
> +
> +static __always_inline void call_do_irq(struct pt_regs *regs, void *sp)
> +{
> + register unsigned long r3 asm("r3") = (unsigned long)regs;
> +
> + /* Temporarily switch r1 to sp, call __do_irq() then restore r1. */
> + asm volatile (
> + PPC_STLU " %%r1, %[offset](%[sp]) ;"
> + "mr %%r1, %[sp] ;"
> + "bl %[callee] ;"
> + PPC_LL " %%r1, 0(%%r1) ;"
> + : // Outputs
> + "+r" (r3)
> + : // Inputs
> + [sp] "b" (sp), [offset] "i" (THREAD_SIZE - STACK_FRAME_OVERHEAD),
> + [callee] "i" (__do_irq)
> + : // Clobbers
> + "lr", "xer", "ctr", "memory", "cr0", "cr1", "cr5", "cr6",
> + "cr7", "r0", "r4", "r5", "r6", "r7", "r8", "r9", "r10",
> + "r11", "r12"
> + );
> +}
> +
> void __do_irq(struct pt_regs *regs)
> {
> unsigned int irq;
> diff --git a/arch/powerpc/kernel/misc_32.S b/arch/powerpc/kernel/misc_32.S
> index acc410043b96..6a076bef2932 100644
> --- a/arch/powerpc/kernel/misc_32.S
> +++ b/arch/powerpc/kernel/misc_32.S
> @@ -27,31 +27,6 @@
>
> .text
>
> -_GLOBAL(call_do_softirq)
> - mflr r0
> - stw r0,4(r1)
> - stwu r1,THREAD_SIZE-STACK_FRAME_OVERHEAD(r3)
> - mr r1,r3
> - bl __do_softirq
> - lwz r1,0(r1)
> - lwz r0,4(r1)
> - mtlr r0
> - blr
> -
> -/*
> - * void call_do_irq(struct pt_regs *regs, void *sp);
> - */
> -_GLOBAL(call_do_irq)
> - mflr r0
> - stw r0,4(r1)
> - stwu r1,THREAD_SIZE-STACK_FRAME_OVERHEAD(r4)
> - mr r1,r4
> - bl __do_irq
> - lwz r1,0(r1)
> - lwz r0,4(r1)
> - mtlr r0
> - blr
> -
> /*
> * This returns the high 64 bits of the product of two 64-bit numbers.
> */
> diff --git a/arch/powerpc/kernel/misc_64.S b/arch/powerpc/kernel/misc_64.S
> index 070465825c21..4b761a18a74d 100644
> --- a/arch/powerpc/kernel/misc_64.S
> +++ b/arch/powerpc/kernel/misc_64.S
> @@ -27,28 +27,6 @@
>
> .text
>
> -_GLOBAL(call_do_softirq)
> - mflr r0
> - std r0,16(r1)
> - stdu r1,THREAD_SIZE-STACK_FRAME_OVERHEAD(r3)
> - mr r1,r3
> - bl __do_softirq
> - ld r1,0(r1)
> - ld r0,16(r1)
> - mtlr r0
> - blr
> -
> -_GLOBAL(call_do_irq)
> - mflr r0
> - std r0,16(r1)
> - stdu r1,THREAD_SIZE-STACK_FRAME_OVERHEAD(r4)
> - mr r1,r4
> - bl __do_irq
> - ld r1,0(r1)
> - ld r0,16(r1)
> - mtlr r0
> - blr
> -
> _GLOBAL(__bswapdi2)
> EXPORT_SYMBOL(__bswapdi2)
> srdi r8,r3,32
> --
> 2.25.1
>
This change caused our ppc44x_defconfig builds to hang when powering
down in QEMU:
https://github.com/ClangBuiltLinux/continuous-integration2/runs/2304364629?check_suite_focus=true#logs
This is probably something with clang given that GCC 10.3.0 works fine
but due to the nature of the change, I have no idea how to tell what is
going wrong. I tried to do some rudimentary debugging with gdb but that
did not really get me anywhere.
The kernel was built with just 'CC=clang' and it is reproducible with
all versions of clang that the kernel supports.
The QEMU invocation is visible at the link above, it is done with our
boot-qemu.sh in this repo, which also houses the rootfs:
https://github.com/ClangBuiltLinux/boot-utils
Happy to provide any other information or debug/test as directed!
Cheers,
Nathan
Christophe Leroy
Apr 27, 2021, 2:39:46 AM4/27/21
to Nathan Chancellor, Michael Ellerman, clang-bu...@googlegroups.com, linuxp...@lists.ozlabs.org
Le 26/04/2021 à 20:50, Nathan Chancellor a écrit :
> On Sat, Mar 20, 2021 at 11:22:27PM +1100, Michael Ellerman wrote:
>> From: Christophe Leroy <christop...@csgroup.eu>
>>
>> call_do_irq() and call_do_softirq() are simple enough to be
>> worth inlining.
>>
>> Inlining them avoids an mflr/mtlr pair plus a save/reload on stack. It
>> also allows GCC to keep the saved ksp_limit in an nonvolatile reg.
>>
>> This is inspired from S390 arch. Several other arches do more or
>> less the same. The way sparc arch does seems odd thought.
>>
>> Signed-off-by: Christophe Leroy <christop...@csgroup.eu>
>> Signed-off-by: Michael Ellerman <m...@ellerman.id.au>
>>
>
> This change caused our ppc44x_defconfig builds to hang when powering
> down in QEMU:
>
> https://github.com/ClangBuiltLinux/continuous-integration2/runs/2304364629?check_suite_focus=true#logs
>
> This is probably something with clang given that GCC 10.3.0 works fine
> but due to the nature of the change, I have no idea how to tell what is
> going wrong. I tried to do some rudimentary debugging with gdb but that
> did not really get me anywhere.
>
> The kernel was built with just 'CC=clang' and it is reproducible with
> all versions of clang that the kernel supports.
>
> The QEMU invocation is visible at the link above, it is done with our
> boot-qemu.sh in this repo, which also houses the rootfs:
>
> https://github.com/ClangBuiltLinux/boot-utils
>
> Happy to provide any other information or debug/test as directed!
>
With GCC:
> down in QEMU:
>
> https://github.com/ClangBuiltLinux/continuous-integration2/runs/2304364629?check_suite_focus=true#logs
>
> This is probably something with clang given that GCC 10.3.0 works fine
> but due to the nature of the change, I have no idea how to tell what is
> going wrong. I tried to do some rudimentary debugging with gdb but that
> did not really get me anywhere.
>
> The kernel was built with just 'CC=clang' and it is reproducible with
> all versions of clang that the kernel supports.
>
> The QEMU invocation is visible at the link above, it is done with our
> boot-qemu.sh in this repo, which also houses the rootfs:
>
> https://github.com/ClangBuiltLinux/boot-utils
>
> Happy to provide any other information or debug/test as directed!
>
000003f0 <do_softirq_own_stack>:
3f0: 94 21 ff f0 stwu r1,-16(r1)
3f4: 7c 08 02 a6 mflr r0
3f8: 3d 20 00 00 lis r9,0
3fa: R_PPC_ADDR16_HA .data..read_mostly+0x4
3fc: 93 e1 00 0c stw r31,12(r1)
400: 90 01 00 14 stw r0,20(r1)
404: 83 e9 00 00 lwz r31,0(r9)
406: R_PPC_ADDR16_LO .data..read_mostly+0x4
408: 94 3f 1f f0 stwu r1,8176(r31)
40c: 7f e1 fb 78 mr r1,r31
410: 48 00 00 01 bl 410 <do_softirq_own_stack+0x20>
410: R_PPC_REL24 __do_softirq
414: 80 21 00 00 lwz r1,0(r1)
418: 80 01 00 14 lwz r0,20(r1)
41c: 83 e1 00 0c lwz r31,12(r1)
420: 38 21 00 10 addi r1,r1,16
424: 7c 08 03 a6 mtlr r0
428: 4e 80 00 20 blr
With CLANG:
000003e8 <do_softirq_own_stack>:
3e8: 94 21 ff f0 stwu r1,-16(r1)
3ec: 93 c1 00 08 stw r30,8(r1)
3f0: 3c 60 00 00 lis r3,0
3f2: R_PPC_ADDR16_HA softirq_ctx
3f4: 83 c3 00 00 lwz r30,0(r3)
3f6: R_PPC_ADDR16_LO softirq_ctx
3f8: 94 3e 1f f0 stwu r1,8176(r30)
3fc: 7f c1 f3 78 mr r1,r30
400: 48 00 00 01 bl 400 <do_softirq_own_stack+0x18>
400: R_PPC_REL24 __do_softirq
404: 80 21 00 00 lwz r1,0(r1)
408: 83 c1 00 08 lwz r30,8(r1)
40c: 38 21 00 10 addi r1,r1,16
410: 4e 80 00 20 blr
As you can see, CLANG doesn't save/restore 'lr' allthought 'lr' is explicitely listed in the
registers clobbered by the inline assembly:
Nick Desaulniers
Apr 27, 2021, 4:42:50 PM4/27/21
to Christophe Leroy, Nathan Chancellor, Michael Ellerman, clang-built-linux, linuxppc-dev
https://bugs.llvm.org/show_bug.cgi?id=50147.
>
> >> +static __always_inline void call_do_softirq(const void *sp)
> >> +{
> >> + /* Temporarily switch r1 to sp, call __do_softirq() then restore r1. */
> >> + asm volatile (
> >> + PPC_STLU " %%r1, %[offset](%[sp]) ;"
> >> + "mr %%r1, %[sp] ;"
> >> + "bl %[callee] ;"
> >> + PPC_LL " %%r1, 0(%%r1) ;"
> >> + : // Outputs
> >> + : // Inputs
> >> + [sp] "b" (sp), [offset] "i" (THREAD_SIZE - STACK_FRAME_OVERHEAD),
> >> + [callee] "i" (__do_softirq)
> >> + : // Clobbers
> >> + "lr", "xer", "ctr", "memory", "cr0", "cr1", "cr5", "cr6",
> >> + "cr7", "r0", "r3", "r4", "r5", "r6", "r7", "r8", "r9", "r10",
> >> + "r11", "r12"
> >> + );
>
> You received this message because you are subscribed to the Google Groups "Clang Built Linux" group.
> To unsubscribe from this group and stop receiving emails from it, send an email to clang-built-li...@googlegroups.com.
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--
Thanks,
~Nick Desaulniers
Nick Desaulniers
Apr 30, 2021, 5:34:05 PM4/30/21
to Christophe Leroy, Nathan Chancellor, Michael Ellerman, clang-built-linux, linuxppc-dev
On Tue, Apr 27, 2021 at 1:42 PM Nick Desaulniers
<ndesau...@google.com> wrote:
>
> On Mon, Apr 26, 2021 at 11:39 PM Christophe Leroy
> <christop...@csgroup.eu> wrote:
> >
> > As you can see, CLANG doesn't save/restore 'lr' allthought 'lr' is explicitely listed in the
> > registers clobbered by the inline assembly:
>
> Ah, thanks for debugging this. Will follow up in
> https://bugs.llvm.org/show_bug.cgi?id=50147.
Looks like there's a fix posted for LLVM in: https://reviews.llvm.org/D101657
<ndesau...@google.com> wrote:
>
> On Mon, Apr 26, 2021 at 11:39 PM Christophe Leroy
> <christop...@csgroup.eu> wrote:
> >
> > As you can see, CLANG doesn't save/restore 'lr' allthought 'lr' is explicitely listed in the
> > registers clobbered by the inline assembly:
>
> Ah, thanks for debugging this. Will follow up in
> https://bugs.llvm.org/show_bug.cgi?id=50147.
Though trying to test it in QEMU, I'm hitting some assertion failure
booting a kernel (even without that patch to LLVM):
qemu-system-ppc: ../../hw/pci/pci.c:253: pci_bus_change_irq_level:
Assertion `irq_num >= 0' failed.
That's with
QEMU emulator version 5.2.0 (Debian 1:5.2+dfsg-9)
I didn't see anything in https://bugs.launchpad.net/qemu/ about it,
but figured I'd share in case that assertion failure looked familiar
to anyone.
--
Thanks,
~Nick Desaulniers
Nick Desaulniers
May 4, 2021, 3:57:00 PM5/4/21
to Christophe Leroy, Nathan Chancellor, Michael Ellerman, clang-built-linux, linuxppc-dev
On Fri, Apr 30, 2021 at 2:33 PM Nick Desaulniers
Nathan pointed out some previous reports; looks like others are
hitting this, too:
https://github.com/ClangBuiltLinux/linux/issues/1345#issuecomment-830451276
--
Thanks,
~Nick Desaulniers
hitting this, too:
https://github.com/ClangBuiltLinux/linux/issues/1345#issuecomment-830451276
--
Thanks,
~Nick Desaulniers
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