* Re: [PATCH] powerpc/32s: Setup the early hash table at all time.
From: Christophe Leroy @ 2020-11-07 9:12 UTC (permalink / raw)
To: Andreas Schwab; +Cc: linuxppc-dev, Paul Mackerras, linux-kernel
In-Reply-To: <87wnz8vizm.fsf@igel.home>
Le 29/10/2020 à 22:07, Andreas Schwab a écrit :
> On Okt 01 2020, Christophe Leroy wrote:
>
>> At the time being, an early hash table is set up when
>> CONFIG_KASAN is selected.
>>
>> There is nothing wrong with setting such an early hash table
>> all the time, even if it is not used. This is a statically
>> allocated 256 kB table which lies in the init data section.
>>
>> This makes the code simpler and may in the future allow to
>> setup early IO mappings with fixmap instead of hard coding BATs.
>>
>> Put create_hpte() and flush_hash_pages() in the .ref.text section
>> in order to avoid warning for the reference to early_hash[]. This
>> reference is removed by MMU_init_hw_patch() before init memory is
>> freed.
>
> This breaks booting on the iBook G4.
>
Can you test patch
https://patchwork.ozlabs.org/project/linuxppc-dev/patch/9e225a856a8b22e0e77587ee22ab7a2f5bca8753.1604740029.git.christophe.leroy@csgroup.eu/
Thanks
Christophe
^ permalink raw reply
* [Bug 209869] Kernel 5.10-rc1 fails to boot on a PowerMac G4 3,6 at an early stage
From: bugzilla-daemon @ 2020-11-07 9:11 UTC (permalink / raw)
To: linuxppc-dev
In-Reply-To: <bug-209869-206035@https.bugzilla.kernel.org/>
https://bugzilla.kernel.org/show_bug.cgi?id=209869
--- Comment #11 from Christophe Leroy (christophe.leroy@csgroup.eu) ---
Can (In reply to Erhard F. from comment #10)
> (In reply to Christophe Leroy from comment #9)
> > Ok, what about 5.10-rc1 + KASAN without reverting the patch ?
> Nope, does not boot. Same 5.10-rc1 .config + KASAN but without reverting the
> patch.
Can you test patch at
https://patchwork.ozlabs.org/project/linuxppc-dev/patch/9e225a856a8b22e0e77587ee22ab7a2f5bca8753.1604740029.git.christophe.leroy@csgroup.eu/
--
You are receiving this mail because:
You are watching the assignee of the bug.
^ permalink raw reply
* [PATCH] powerpc/32s: Use relocation offset when setting early hash table
From: Christophe Leroy @ 2020-11-07 9:07 UTC (permalink / raw)
To: Benjamin Herrenschmidt, Paul Mackerras, Michael Ellerman,
erhard_f, schwab
Cc: linuxppc-dev, linux-kernel
When calling early_hash_table(), the kernel hasn't been yet
relocated to its linking address, so data must be addressed
with relocation offset.
Add relocation offset to write into Hash in early_hash_table().
Reported-by: Erhard Furtner <erhard_f@mailbox.org>
Reported-by: Andreas Schwab <schwab@linux-m68k.org>
Fixes: 69a1593abdbc ("powerpc/32s: Setup the early hash table at all time.")
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
---
arch/powerpc/kernel/head_book3s_32.S | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/arch/powerpc/kernel/head_book3s_32.S b/arch/powerpc/kernel/head_book3s_32.S
index 5eb9eedac920..8aa7eb11754e 100644
--- a/arch/powerpc/kernel/head_book3s_32.S
+++ b/arch/powerpc/kernel/head_book3s_32.S
@@ -156,6 +156,7 @@ __after_mmu_off:
bl initial_bats
bl load_segment_registers
BEGIN_MMU_FTR_SECTION
+ bl reloc_offset
bl early_hash_table
END_MMU_FTR_SECTION_IFSET(MMU_FTR_HPTE_TABLE)
#if defined(CONFIG_BOOTX_TEXT)
@@ -932,7 +933,7 @@ early_hash_table:
ori r6, r6, 3 /* 256kB table */
mtspr SPRN_SDR1, r6
lis r6, early_hash@h
- lis r3, Hash@ha
+ addis r3, r3, Hash@ha
stw r6, Hash@l(r3)
blr
--
2.25.0
^ permalink raw reply related
* Re: [PATCH] powerpc: add compile-time support for lbarx, lwarx
From: Christophe Leroy @ 2020-11-07 8:15 UTC (permalink / raw)
To: Nicholas Piggin, linuxppc-dev
In-Reply-To: <20201107032328.2454582-1-npiggin@gmail.com>
Le 07/11/2020 à 04:23, Nicholas Piggin a écrit :
> ISA v2.06 (POWER7 and up) as well as e6500 support lbarx and lwarx.
> Add a compile option that allows code to use it, and add support in
> cmpxchg and xchg 8 and 16 bit values.
Do you mean lharx ? Because lwarx exists on all powerpcs I think.
>
> Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
> ---
> arch/powerpc/Kconfig | 3 +
> arch/powerpc/include/asm/cmpxchg.h | 236 ++++++++++++++++++++++++-
> arch/powerpc/platforms/Kconfig.cputype | 5 +
> 3 files changed, 243 insertions(+), 1 deletion(-)
>
> diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
> index e9f13fe08492..d231af06f75a 100644
> --- a/arch/powerpc/Kconfig
> +++ b/arch/powerpc/Kconfig
> @@ -266,6 +266,9 @@ config PPC_BARRIER_NOSPEC
> default y
> depends on PPC_BOOK3S_64 || PPC_FSL_BOOK3E
>
> +config PPC_LBARX_LWARX
> + bool
s/LWARX/LHARX/ ?
And maybe better with PPC_HAS_LBARX_LWARX ?
> +
> config EARLY_PRINTK
> bool
> default y
> diff --git a/arch/powerpc/include/asm/cmpxchg.h b/arch/powerpc/include/asm/cmpxchg.h
> index cf091c4c22e5..17fd996dc0d4 100644
> --- a/arch/powerpc/include/asm/cmpxchg.h
> +++ b/arch/powerpc/include/asm/cmpxchg.h
> @@ -77,10 +77,76 @@ u32 __cmpxchg_##type##sfx(volatile void *p, u32 old, u32 new) \
> * the previous value stored there.
> */
>
> +#ifndef CONFIG_PPC_LBARX_LWARX
> XCHG_GEN(u8, _local, "memory");
> XCHG_GEN(u8, _relaxed, "cc");
> XCHG_GEN(u16, _local, "memory");
> XCHG_GEN(u16, _relaxed, "cc");
> +#else
> +static __always_inline unsigned long
> +__xchg_u8_local(volatile void *p, unsigned long val)
> +{
> + unsigned long prev;
> +
> + __asm__ __volatile__(
> +"1: lbarx %0,0,%2 \n"
> +" stbcx. %3,0,%2 \n\
> + bne- 1b"
> + : "=&r" (prev), "+m" (*(volatile unsigned char *)p)
> + : "r" (p), "r" (val)
> + : "cc", "memory");
> +
> + return prev;
> +}
> +
> +static __always_inline unsigned long
> +__xchg_u8_relaxed(u8 *p, unsigned long val)
> +{
> + unsigned long prev;
> +
> + __asm__ __volatile__(
> +"1: lbarx %0,0,%2\n"
> +" stbcx. %3,0,%2\n"
> +" bne- 1b"
> + : "=&r" (prev), "+m" (*p)
> + : "r" (p), "r" (val)
> + : "cc");
> +
> + return prev;
> +}
> +
> +static __always_inline unsigned long
> +__xchg_u16_local(volatile void *p, unsigned long val)
> +{
> + unsigned long prev;
> +
> + __asm__ __volatile__(
> +"1: lharx %0,0,%2 \n"
> +" sthcx. %3,0,%2 \n\
> + bne- 1b"
> + : "=&r" (prev), "+m" (*(volatile unsigned short *)p)
> + : "r" (p), "r" (val)
> + : "cc", "memory");
> +
> + return prev;
> +}
> +
> +static __always_inline unsigned long
> +__xchg_u16_relaxed(u16 *p, unsigned long val)
> +{
> + unsigned long prev;
> +
> + __asm__ __volatile__(
> +"1: lharx %0,0,%2\n"
> +" sthcx. %3,0,%2\n"
> +" bne- 1b"
> + : "=&r" (prev), "+m" (*p)
> + : "r" (p), "r" (val)
> + : "cc");
> +
> + return prev;
> +}
> +#endif
That's a lot of code duplication. Could we use some macro, in the same spirit as what is done in
arch/powerpc/include/asm/io.h for in_be16(), in_be32(), in_be64() and friends ?
>
> static __always_inline unsigned long
> __xchg_u32_local(volatile void *p, unsigned long val)
> @@ -198,11 +264,12 @@ __xchg_relaxed(void *ptr, unsigned long x, unsigned int size)
> (__typeof__(*(ptr))) __xchg_relaxed((ptr), \
> (unsigned long)_x_, sizeof(*(ptr))); \
> })
> +
> /*
> * Compare and exchange - if *p == old, set it to new,
> * and return the old value of *p.
> */
> -
> +#ifndef CONFIG_PPC_LBARX_LWARX
> CMPXCHG_GEN(u8, , PPC_ATOMIC_ENTRY_BARRIER, PPC_ATOMIC_EXIT_BARRIER, "memory");
> CMPXCHG_GEN(u8, _local, , , "memory");
> CMPXCHG_GEN(u8, _acquire, , PPC_ACQUIRE_BARRIER, "memory");
> @@ -211,6 +278,173 @@ CMPXCHG_GEN(u16, , PPC_ATOMIC_ENTRY_BARRIER, PPC_ATOMIC_EXIT_BARRIER, "memory");
> CMPXCHG_GEN(u16, _local, , , "memory");
> CMPXCHG_GEN(u16, _acquire, , PPC_ACQUIRE_BARRIER, "memory");
> CMPXCHG_GEN(u16, _relaxed, , , "cc");
> +#else
> +static __always_inline unsigned long
> +__cmpxchg_u8(volatile unsigned char *p, unsigned long old, unsigned long new)
> +{
> + unsigned int prev;
> +
> + __asm__ __volatile__ (
> + PPC_ATOMIC_ENTRY_BARRIER
> +"1: lbarx %0,0,%2 # __cmpxchg_u8\n\
> + cmpw 0,%0,%3\n\
> + bne- 2f\n"
> +" stbcx. %4,0,%2\n\
> + bne- 1b"
> + PPC_ATOMIC_EXIT_BARRIER
> + "\n\
> +2:"
> + : "=&r" (prev), "+m" (*p)
> + : "r" (p), "r" (old), "r" (new)
> + : "cc", "memory");
> +
> + return prev;
> +}
> +
> +static __always_inline unsigned long
> +__cmpxchg_u8_local(volatile unsigned char *p, unsigned long old,
> + unsigned long new)
> +{
> + unsigned int prev;
> +
> + __asm__ __volatile__ (
> +"1: lbarx %0,0,%2 # __cmpxchg_u8\n\
> + cmpw 0,%0,%3\n\
> + bne- 2f\n"
> +" stbcx. %4,0,%2\n\
> + bne- 1b"
> + "\n\
> +2:"
> + : "=&r" (prev), "+m" (*p)
> + : "r" (p), "r" (old), "r" (new)
> + : "cc", "memory");
> +
> + return prev;
> +}
> +
> +static __always_inline unsigned long
> +__cmpxchg_u8_relaxed(u8 *p, unsigned long old, unsigned long new)
> +{
> + unsigned long prev;
> +
> + __asm__ __volatile__ (
> +"1: lbarx %0,0,%2 # __cmpxchg_u8_relaxed\n"
> +" cmpw 0,%0,%3\n"
> +" bne- 2f\n"
> +" stbcx. %4,0,%2\n"
> +" bne- 1b\n"
> +"2:"
> + : "=&r" (prev), "+m" (*p)
> + : "r" (p), "r" (old), "r" (new)
> + : "cc");
> +
> + return prev;
> +}
> +
> +static __always_inline unsigned long
> +__cmpxchg_u8_acquire(u8 *p, unsigned long old, unsigned long new)
> +{
> + unsigned long prev;
> +
> + __asm__ __volatile__ (
> +"1: lbarx %0,0,%2 # __cmpxchg_u8_acquire\n"
> +" cmpw 0,%0,%3\n"
> +" bne- 2f\n"
> +" stbcx. %4,0,%2\n"
> +" bne- 1b\n"
> + PPC_ACQUIRE_BARRIER
> + "\n"
> +"2:"
> + : "=&r" (prev), "+m" (*p)
> + : "r" (p), "r" (old), "r" (new)
> + : "cc", "memory");
> +
> + return prev;
> +}
> +
> +static __always_inline unsigned long
> +__cmpxchg_u16(volatile unsigned short *p, unsigned long old, unsigned long new)
> +{
> + unsigned int prev;
> +
> + __asm__ __volatile__ (
> + PPC_ATOMIC_ENTRY_BARRIER
> +"1: lharx %0,0,%2 # __cmpxchg_u16\n\
> + cmpw 0,%0,%3\n\
> + bne- 2f\n"
> +" sthcx. %4,0,%2\n\
> + bne- 1b"
> + PPC_ATOMIC_EXIT_BARRIER
> + "\n\
> +2:"
> + : "=&r" (prev), "+m" (*p)
> + : "r" (p), "r" (old), "r" (new)
> + : "cc", "memory");
> +
> + return prev;
> +}
> +
> +static __always_inline unsigned long
> +__cmpxchg_u16_local(volatile unsigned short *p, unsigned long old,
> + unsigned long new)
> +{
> + unsigned int prev;
> +
> + __asm__ __volatile__ (
> +"1: lharx %0,0,%2 # __cmpxchg_u16\n\
> + cmpw 0,%0,%3\n\
> + bne- 2f\n"
> +" sthcx. %4,0,%2\n\
> + bne- 1b"
> + "\n\
> +2:"
> + : "=&r" (prev), "+m" (*p)
> + : "r" (p), "r" (old), "r" (new)
> + : "cc", "memory");
> +
> + return prev;
> +}
> +
> +static __always_inline unsigned long
> +__cmpxchg_u16_relaxed(u16 *p, unsigned long old, unsigned long new)
> +{
> + unsigned long prev;
> +
> + __asm__ __volatile__ (
> +"1: lharx %0,0,%2 # __cmpxchg_u16_relaxed\n"
> +" cmpw 0,%0,%3\n"
> +" bne- 2f\n"
> +" sthcx. %4,0,%2\n"
> +" bne- 1b\n"
> +"2:"
> + : "=&r" (prev), "+m" (*p)
> + : "r" (p), "r" (old), "r" (new)
> + : "cc");
> +
> + return prev;
> +}
> +
> +static __always_inline unsigned long
> +__cmpxchg_u16_acquire(u16 *p, unsigned long old, unsigned long new)
> +{
> + unsigned long prev;
> +
> + __asm__ __volatile__ (
> +"1: lharx %0,0,%2 # __cmpxchg_u16_acquire\n"
> +" cmpw 0,%0,%3\n"
> +" bne- 2f\n"
> +" sthcx. %4,0,%2\n"
> +" bne- 1b\n"
> + PPC_ACQUIRE_BARRIER
> + "\n"
> +"2:"
> + : "=&r" (prev), "+m" (*p)
> + : "r" (p), "r" (old), "r" (new)
> + : "cc", "memory");
> +
> + return prev;
> +}
> +#endif
That's a lot of code duplication. Could we use some macro, in the same spirit as what is done in
arch/powerpc/include/asm/io.h for in_be16(), in_be32(), in_be64() and friends ?
>
> static __always_inline unsigned long
> __cmpxchg_u32(volatile unsigned int *p, unsigned long old, unsigned long new)
> diff --git a/arch/powerpc/platforms/Kconfig.cputype b/arch/powerpc/platforms/Kconfig.cputype
> index c194c4ae8bc7..2f8c8d61dba4 100644
> --- a/arch/powerpc/platforms/Kconfig.cputype
> +++ b/arch/powerpc/platforms/Kconfig.cputype
> @@ -118,6 +118,7 @@ config GENERIC_CPU
> bool "Generic (POWER8 and above)"
> depends on PPC64 && CPU_LITTLE_ENDIAN
> select ARCH_HAS_FAST_MULTIPLIER
> + select PPC_LBARX_LWARX
s/LWARX/LHARX/ ?
>
> config GENERIC_CPU
> bool "Generic 32 bits powerpc"
> @@ -139,16 +140,19 @@ config POWER7_CPU
> bool "POWER7"
> depends on PPC_BOOK3S_64
> select ARCH_HAS_FAST_MULTIPLIER
> + select PPC_LBARX_LWARX
>
> config POWER8_CPU
> bool "POWER8"
> depends on PPC_BOOK3S_64
> select ARCH_HAS_FAST_MULTIPLIER
> + select PPC_LBARX_LWARX
>
> config POWER9_CPU
> bool "POWER9"
> depends on PPC_BOOK3S_64
> select ARCH_HAS_FAST_MULTIPLIER
> + select PPC_LBARX_LWARX
>
> config E5500_CPU
> bool "Freescale e5500"
> @@ -157,6 +161,7 @@ config E5500_CPU
> config E6500_CPU
> bool "Freescale e6500"
> depends on E500
> + select PPC_LBARX_LWARX
>
> config 860_CPU
> bool "8xx family"
>
Christophe
^ permalink raw reply
* Re: [PATCH] KVM: PPC: Book3S: Assign boolean values to a bool variable
From: Greg Kurz @ 2020-11-07 7:36 UTC (permalink / raw)
To: xiakaixu1987; +Cc: Kaixu Xia, linuxppc-dev, linux-kernel, kvm-ppc
In-Reply-To: <1604730382-5810-1-git-send-email-kaixuxia@tencent.com>
On Sat, 7 Nov 2020 14:26:22 +0800
xiakaixu1987@gmail.com wrote:
> From: Kaixu Xia <kaixuxia@tencent.com>
>
> Fix the following coccinelle warnings:
>
> ./arch/powerpc/kvm/book3s_xics.c:476:3-15: WARNING: Assignment of 0/1 to bool variable
> ./arch/powerpc/kvm/book3s_xics.c:504:3-15: WARNING: Assignment of 0/1 to bool variable
>
> Reported-by: Tosk Robot <tencent_os_robot@tencent.com>
> Signed-off-by: Kaixu Xia <kaixuxia@tencent.com>
> ---
Reviewed-by: Greg Kurz <groug@kaod.org>
> arch/powerpc/kvm/book3s_xics.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/arch/powerpc/kvm/book3s_xics.c b/arch/powerpc/kvm/book3s_xics.c
> index 5fee5a11550d..303e3cb096db 100644
> --- a/arch/powerpc/kvm/book3s_xics.c
> +++ b/arch/powerpc/kvm/book3s_xics.c
> @@ -473,7 +473,7 @@ static void icp_deliver_irq(struct kvmppc_xics *xics, struct kvmppc_icp *icp,
> arch_spin_unlock(&ics->lock);
> local_irq_restore(flags);
> new_irq = reject;
> - check_resend = 0;
> + check_resend = false;
> goto again;
> }
> } else {
> @@ -501,7 +501,7 @@ static void icp_deliver_irq(struct kvmppc_xics *xics, struct kvmppc_icp *icp,
> state->resend = 0;
> arch_spin_unlock(&ics->lock);
> local_irq_restore(flags);
> - check_resend = 0;
> + check_resend = false;
> goto again;
> }
> }
^ permalink raw reply
* Re: [PATCH] powerpc: add compile-time support for lbarx, lwarx
From: Gabriel Paubert @ 2020-11-07 7:12 UTC (permalink / raw)
To: Nicholas Piggin; +Cc: linuxppc-dev
In-Reply-To: <20201107032328.2454582-1-npiggin@gmail.com>
On Sat, Nov 07, 2020 at 01:23:28PM +1000, Nicholas Piggin wrote:
> ISA v2.06 (POWER7 and up) as well as e6500 support lbarx and lwarx.
Hmm, lwarx exists since original Power AFAIR, s/lwarx/lharx/ perhaps?
Same for the title of the patch and the CONFIG variable.
Gabriel
> Add a compile option that allows code to use it, and add support in
> cmpxchg and xchg 8 and 16 bit values.
>
> Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
> ---
> arch/powerpc/Kconfig | 3 +
> arch/powerpc/include/asm/cmpxchg.h | 236 ++++++++++++++++++++++++-
> arch/powerpc/platforms/Kconfig.cputype | 5 +
> 3 files changed, 243 insertions(+), 1 deletion(-)
>
> diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
> index e9f13fe08492..d231af06f75a 100644
> --- a/arch/powerpc/Kconfig
> +++ b/arch/powerpc/Kconfig
> @@ -266,6 +266,9 @@ config PPC_BARRIER_NOSPEC
> default y
> depends on PPC_BOOK3S_64 || PPC_FSL_BOOK3E
>
> +config PPC_LBARX_LWARX
> + bool
> +
> config EARLY_PRINTK
> bool
> default y
> diff --git a/arch/powerpc/include/asm/cmpxchg.h b/arch/powerpc/include/asm/cmpxchg.h
> index cf091c4c22e5..17fd996dc0d4 100644
> --- a/arch/powerpc/include/asm/cmpxchg.h
> +++ b/arch/powerpc/include/asm/cmpxchg.h
> @@ -77,10 +77,76 @@ u32 __cmpxchg_##type##sfx(volatile void *p, u32 old, u32 new) \
> * the previous value stored there.
> */
>
> +#ifndef CONFIG_PPC_LBARX_LWARX
> XCHG_GEN(u8, _local, "memory");
> XCHG_GEN(u8, _relaxed, "cc");
> XCHG_GEN(u16, _local, "memory");
> XCHG_GEN(u16, _relaxed, "cc");
> +#else
> +static __always_inline unsigned long
> +__xchg_u8_local(volatile void *p, unsigned long val)
> +{
> + unsigned long prev;
> +
> + __asm__ __volatile__(
> +"1: lbarx %0,0,%2 \n"
> +" stbcx. %3,0,%2 \n\
> + bne- 1b"
> + : "=&r" (prev), "+m" (*(volatile unsigned char *)p)
> + : "r" (p), "r" (val)
> + : "cc", "memory");
> +
> + return prev;
> +}
> +
> +static __always_inline unsigned long
> +__xchg_u8_relaxed(u8 *p, unsigned long val)
> +{
> + unsigned long prev;
> +
> + __asm__ __volatile__(
> +"1: lbarx %0,0,%2\n"
> +" stbcx. %3,0,%2\n"
> +" bne- 1b"
> + : "=&r" (prev), "+m" (*p)
> + : "r" (p), "r" (val)
> + : "cc");
> +
> + return prev;
> +}
> +
> +static __always_inline unsigned long
> +__xchg_u16_local(volatile void *p, unsigned long val)
> +{
> + unsigned long prev;
> +
> + __asm__ __volatile__(
> +"1: lharx %0,0,%2 \n"
> +" sthcx. %3,0,%2 \n\
> + bne- 1b"
> + : "=&r" (prev), "+m" (*(volatile unsigned short *)p)
> + : "r" (p), "r" (val)
> + : "cc", "memory");
> +
> + return prev;
> +}
> +
> +static __always_inline unsigned long
> +__xchg_u16_relaxed(u16 *p, unsigned long val)
> +{
> + unsigned long prev;
> +
> + __asm__ __volatile__(
> +"1: lharx %0,0,%2\n"
> +" sthcx. %3,0,%2\n"
> +" bne- 1b"
> + : "=&r" (prev), "+m" (*p)
> + : "r" (p), "r" (val)
> + : "cc");
> +
> + return prev;
> +}
> +#endif
>
> static __always_inline unsigned long
> __xchg_u32_local(volatile void *p, unsigned long val)
> @@ -198,11 +264,12 @@ __xchg_relaxed(void *ptr, unsigned long x, unsigned int size)
> (__typeof__(*(ptr))) __xchg_relaxed((ptr), \
> (unsigned long)_x_, sizeof(*(ptr))); \
> })
> +
> /*
> * Compare and exchange - if *p == old, set it to new,
> * and return the old value of *p.
> */
> -
> +#ifndef CONFIG_PPC_LBARX_LWARX
> CMPXCHG_GEN(u8, , PPC_ATOMIC_ENTRY_BARRIER, PPC_ATOMIC_EXIT_BARRIER, "memory");
> CMPXCHG_GEN(u8, _local, , , "memory");
> CMPXCHG_GEN(u8, _acquire, , PPC_ACQUIRE_BARRIER, "memory");
> @@ -211,6 +278,173 @@ CMPXCHG_GEN(u16, , PPC_ATOMIC_ENTRY_BARRIER, PPC_ATOMIC_EXIT_BARRIER, "memory");
> CMPXCHG_GEN(u16, _local, , , "memory");
> CMPXCHG_GEN(u16, _acquire, , PPC_ACQUIRE_BARRIER, "memory");
> CMPXCHG_GEN(u16, _relaxed, , , "cc");
> +#else
> +static __always_inline unsigned long
> +__cmpxchg_u8(volatile unsigned char *p, unsigned long old, unsigned long new)
> +{
> + unsigned int prev;
> +
> + __asm__ __volatile__ (
> + PPC_ATOMIC_ENTRY_BARRIER
> +"1: lbarx %0,0,%2 # __cmpxchg_u8\n\
> + cmpw 0,%0,%3\n\
> + bne- 2f\n"
> +" stbcx. %4,0,%2\n\
> + bne- 1b"
> + PPC_ATOMIC_EXIT_BARRIER
> + "\n\
> +2:"
> + : "=&r" (prev), "+m" (*p)
> + : "r" (p), "r" (old), "r" (new)
> + : "cc", "memory");
> +
> + return prev;
> +}
> +
> +static __always_inline unsigned long
> +__cmpxchg_u8_local(volatile unsigned char *p, unsigned long old,
> + unsigned long new)
> +{
> + unsigned int prev;
> +
> + __asm__ __volatile__ (
> +"1: lbarx %0,0,%2 # __cmpxchg_u8\n\
> + cmpw 0,%0,%3\n\
> + bne- 2f\n"
> +" stbcx. %4,0,%2\n\
> + bne- 1b"
> + "\n\
> +2:"
> + : "=&r" (prev), "+m" (*p)
> + : "r" (p), "r" (old), "r" (new)
> + : "cc", "memory");
> +
> + return prev;
> +}
> +
> +static __always_inline unsigned long
> +__cmpxchg_u8_relaxed(u8 *p, unsigned long old, unsigned long new)
> +{
> + unsigned long prev;
> +
> + __asm__ __volatile__ (
> +"1: lbarx %0,0,%2 # __cmpxchg_u8_relaxed\n"
> +" cmpw 0,%0,%3\n"
> +" bne- 2f\n"
> +" stbcx. %4,0,%2\n"
> +" bne- 1b\n"
> +"2:"
> + : "=&r" (prev), "+m" (*p)
> + : "r" (p), "r" (old), "r" (new)
> + : "cc");
> +
> + return prev;
> +}
> +
> +static __always_inline unsigned long
> +__cmpxchg_u8_acquire(u8 *p, unsigned long old, unsigned long new)
> +{
> + unsigned long prev;
> +
> + __asm__ __volatile__ (
> +"1: lbarx %0,0,%2 # __cmpxchg_u8_acquire\n"
> +" cmpw 0,%0,%3\n"
> +" bne- 2f\n"
> +" stbcx. %4,0,%2\n"
> +" bne- 1b\n"
> + PPC_ACQUIRE_BARRIER
> + "\n"
> +"2:"
> + : "=&r" (prev), "+m" (*p)
> + : "r" (p), "r" (old), "r" (new)
> + : "cc", "memory");
> +
> + return prev;
> +}
> +
> +static __always_inline unsigned long
> +__cmpxchg_u16(volatile unsigned short *p, unsigned long old, unsigned long new)
> +{
> + unsigned int prev;
> +
> + __asm__ __volatile__ (
> + PPC_ATOMIC_ENTRY_BARRIER
> +"1: lharx %0,0,%2 # __cmpxchg_u16\n\
> + cmpw 0,%0,%3\n\
> + bne- 2f\n"
> +" sthcx. %4,0,%2\n\
> + bne- 1b"
> + PPC_ATOMIC_EXIT_BARRIER
> + "\n\
> +2:"
> + : "=&r" (prev), "+m" (*p)
> + : "r" (p), "r" (old), "r" (new)
> + : "cc", "memory");
> +
> + return prev;
> +}
> +
> +static __always_inline unsigned long
> +__cmpxchg_u16_local(volatile unsigned short *p, unsigned long old,
> + unsigned long new)
> +{
> + unsigned int prev;
> +
> + __asm__ __volatile__ (
> +"1: lharx %0,0,%2 # __cmpxchg_u16\n\
> + cmpw 0,%0,%3\n\
> + bne- 2f\n"
> +" sthcx. %4,0,%2\n\
> + bne- 1b"
> + "\n\
> +2:"
> + : "=&r" (prev), "+m" (*p)
> + : "r" (p), "r" (old), "r" (new)
> + : "cc", "memory");
> +
> + return prev;
> +}
> +
> +static __always_inline unsigned long
> +__cmpxchg_u16_relaxed(u16 *p, unsigned long old, unsigned long new)
> +{
> + unsigned long prev;
> +
> + __asm__ __volatile__ (
> +"1: lharx %0,0,%2 # __cmpxchg_u16_relaxed\n"
> +" cmpw 0,%0,%3\n"
> +" bne- 2f\n"
> +" sthcx. %4,0,%2\n"
> +" bne- 1b\n"
> +"2:"
> + : "=&r" (prev), "+m" (*p)
> + : "r" (p), "r" (old), "r" (new)
> + : "cc");
> +
> + return prev;
> +}
> +
> +static __always_inline unsigned long
> +__cmpxchg_u16_acquire(u16 *p, unsigned long old, unsigned long new)
> +{
> + unsigned long prev;
> +
> + __asm__ __volatile__ (
> +"1: lharx %0,0,%2 # __cmpxchg_u16_acquire\n"
> +" cmpw 0,%0,%3\n"
> +" bne- 2f\n"
> +" sthcx. %4,0,%2\n"
> +" bne- 1b\n"
> + PPC_ACQUIRE_BARRIER
> + "\n"
> +"2:"
> + : "=&r" (prev), "+m" (*p)
> + : "r" (p), "r" (old), "r" (new)
> + : "cc", "memory");
> +
> + return prev;
> +}
> +#endif
>
> static __always_inline unsigned long
> __cmpxchg_u32(volatile unsigned int *p, unsigned long old, unsigned long new)
> diff --git a/arch/powerpc/platforms/Kconfig.cputype b/arch/powerpc/platforms/Kconfig.cputype
> index c194c4ae8bc7..2f8c8d61dba4 100644
> --- a/arch/powerpc/platforms/Kconfig.cputype
> +++ b/arch/powerpc/platforms/Kconfig.cputype
> @@ -118,6 +118,7 @@ config GENERIC_CPU
> bool "Generic (POWER8 and above)"
> depends on PPC64 && CPU_LITTLE_ENDIAN
> select ARCH_HAS_FAST_MULTIPLIER
> + select PPC_LBARX_LWARX
>
> config GENERIC_CPU
> bool "Generic 32 bits powerpc"
> @@ -139,16 +140,19 @@ config POWER7_CPU
> bool "POWER7"
> depends on PPC_BOOK3S_64
> select ARCH_HAS_FAST_MULTIPLIER
> + select PPC_LBARX_LWARX
>
> config POWER8_CPU
> bool "POWER8"
> depends on PPC_BOOK3S_64
> select ARCH_HAS_FAST_MULTIPLIER
> + select PPC_LBARX_LWARX
>
> config POWER9_CPU
> bool "POWER9"
> depends on PPC_BOOK3S_64
> select ARCH_HAS_FAST_MULTIPLIER
> + select PPC_LBARX_LWARX
>
> config E5500_CPU
> bool "Freescale e5500"
> @@ -157,6 +161,7 @@ config E5500_CPU
> config E6500_CPU
> bool "Freescale e6500"
> depends on E500
> + select PPC_LBARX_LWARX
>
> config 860_CPU
> bool "8xx family"
> --
> 2.23.0
>
^ permalink raw reply
* [PATCH] powerpc: add compile-time support for lbarx, lwarx
From: Nicholas Piggin @ 2020-11-07 3:23 UTC (permalink / raw)
To: linuxppc-dev; +Cc: Nicholas Piggin
ISA v2.06 (POWER7 and up) as well as e6500 support lbarx and lwarx.
Add a compile option that allows code to use it, and add support in
cmpxchg and xchg 8 and 16 bit values.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
---
arch/powerpc/Kconfig | 3 +
arch/powerpc/include/asm/cmpxchg.h | 236 ++++++++++++++++++++++++-
arch/powerpc/platforms/Kconfig.cputype | 5 +
3 files changed, 243 insertions(+), 1 deletion(-)
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index e9f13fe08492..d231af06f75a 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -266,6 +266,9 @@ config PPC_BARRIER_NOSPEC
default y
depends on PPC_BOOK3S_64 || PPC_FSL_BOOK3E
+config PPC_LBARX_LWARX
+ bool
+
config EARLY_PRINTK
bool
default y
diff --git a/arch/powerpc/include/asm/cmpxchg.h b/arch/powerpc/include/asm/cmpxchg.h
index cf091c4c22e5..17fd996dc0d4 100644
--- a/arch/powerpc/include/asm/cmpxchg.h
+++ b/arch/powerpc/include/asm/cmpxchg.h
@@ -77,10 +77,76 @@ u32 __cmpxchg_##type##sfx(volatile void *p, u32 old, u32 new) \
* the previous value stored there.
*/
+#ifndef CONFIG_PPC_LBARX_LWARX
XCHG_GEN(u8, _local, "memory");
XCHG_GEN(u8, _relaxed, "cc");
XCHG_GEN(u16, _local, "memory");
XCHG_GEN(u16, _relaxed, "cc");
+#else
+static __always_inline unsigned long
+__xchg_u8_local(volatile void *p, unsigned long val)
+{
+ unsigned long prev;
+
+ __asm__ __volatile__(
+"1: lbarx %0,0,%2 \n"
+" stbcx. %3,0,%2 \n\
+ bne- 1b"
+ : "=&r" (prev), "+m" (*(volatile unsigned char *)p)
+ : "r" (p), "r" (val)
+ : "cc", "memory");
+
+ return prev;
+}
+
+static __always_inline unsigned long
+__xchg_u8_relaxed(u8 *p, unsigned long val)
+{
+ unsigned long prev;
+
+ __asm__ __volatile__(
+"1: lbarx %0,0,%2\n"
+" stbcx. %3,0,%2\n"
+" bne- 1b"
+ : "=&r" (prev), "+m" (*p)
+ : "r" (p), "r" (val)
+ : "cc");
+
+ return prev;
+}
+
+static __always_inline unsigned long
+__xchg_u16_local(volatile void *p, unsigned long val)
+{
+ unsigned long prev;
+
+ __asm__ __volatile__(
+"1: lharx %0,0,%2 \n"
+" sthcx. %3,0,%2 \n\
+ bne- 1b"
+ : "=&r" (prev), "+m" (*(volatile unsigned short *)p)
+ : "r" (p), "r" (val)
+ : "cc", "memory");
+
+ return prev;
+}
+
+static __always_inline unsigned long
+__xchg_u16_relaxed(u16 *p, unsigned long val)
+{
+ unsigned long prev;
+
+ __asm__ __volatile__(
+"1: lharx %0,0,%2\n"
+" sthcx. %3,0,%2\n"
+" bne- 1b"
+ : "=&r" (prev), "+m" (*p)
+ : "r" (p), "r" (val)
+ : "cc");
+
+ return prev;
+}
+#endif
static __always_inline unsigned long
__xchg_u32_local(volatile void *p, unsigned long val)
@@ -198,11 +264,12 @@ __xchg_relaxed(void *ptr, unsigned long x, unsigned int size)
(__typeof__(*(ptr))) __xchg_relaxed((ptr), \
(unsigned long)_x_, sizeof(*(ptr))); \
})
+
/*
* Compare and exchange - if *p == old, set it to new,
* and return the old value of *p.
*/
-
+#ifndef CONFIG_PPC_LBARX_LWARX
CMPXCHG_GEN(u8, , PPC_ATOMIC_ENTRY_BARRIER, PPC_ATOMIC_EXIT_BARRIER, "memory");
CMPXCHG_GEN(u8, _local, , , "memory");
CMPXCHG_GEN(u8, _acquire, , PPC_ACQUIRE_BARRIER, "memory");
@@ -211,6 +278,173 @@ CMPXCHG_GEN(u16, , PPC_ATOMIC_ENTRY_BARRIER, PPC_ATOMIC_EXIT_BARRIER, "memory");
CMPXCHG_GEN(u16, _local, , , "memory");
CMPXCHG_GEN(u16, _acquire, , PPC_ACQUIRE_BARRIER, "memory");
CMPXCHG_GEN(u16, _relaxed, , , "cc");
+#else
+static __always_inline unsigned long
+__cmpxchg_u8(volatile unsigned char *p, unsigned long old, unsigned long new)
+{
+ unsigned int prev;
+
+ __asm__ __volatile__ (
+ PPC_ATOMIC_ENTRY_BARRIER
+"1: lbarx %0,0,%2 # __cmpxchg_u8\n\
+ cmpw 0,%0,%3\n\
+ bne- 2f\n"
+" stbcx. %4,0,%2\n\
+ bne- 1b"
+ PPC_ATOMIC_EXIT_BARRIER
+ "\n\
+2:"
+ : "=&r" (prev), "+m" (*p)
+ : "r" (p), "r" (old), "r" (new)
+ : "cc", "memory");
+
+ return prev;
+}
+
+static __always_inline unsigned long
+__cmpxchg_u8_local(volatile unsigned char *p, unsigned long old,
+ unsigned long new)
+{
+ unsigned int prev;
+
+ __asm__ __volatile__ (
+"1: lbarx %0,0,%2 # __cmpxchg_u8\n\
+ cmpw 0,%0,%3\n\
+ bne- 2f\n"
+" stbcx. %4,0,%2\n\
+ bne- 1b"
+ "\n\
+2:"
+ : "=&r" (prev), "+m" (*p)
+ : "r" (p), "r" (old), "r" (new)
+ : "cc", "memory");
+
+ return prev;
+}
+
+static __always_inline unsigned long
+__cmpxchg_u8_relaxed(u8 *p, unsigned long old, unsigned long new)
+{
+ unsigned long prev;
+
+ __asm__ __volatile__ (
+"1: lbarx %0,0,%2 # __cmpxchg_u8_relaxed\n"
+" cmpw 0,%0,%3\n"
+" bne- 2f\n"
+" stbcx. %4,0,%2\n"
+" bne- 1b\n"
+"2:"
+ : "=&r" (prev), "+m" (*p)
+ : "r" (p), "r" (old), "r" (new)
+ : "cc");
+
+ return prev;
+}
+
+static __always_inline unsigned long
+__cmpxchg_u8_acquire(u8 *p, unsigned long old, unsigned long new)
+{
+ unsigned long prev;
+
+ __asm__ __volatile__ (
+"1: lbarx %0,0,%2 # __cmpxchg_u8_acquire\n"
+" cmpw 0,%0,%3\n"
+" bne- 2f\n"
+" stbcx. %4,0,%2\n"
+" bne- 1b\n"
+ PPC_ACQUIRE_BARRIER
+ "\n"
+"2:"
+ : "=&r" (prev), "+m" (*p)
+ : "r" (p), "r" (old), "r" (new)
+ : "cc", "memory");
+
+ return prev;
+}
+
+static __always_inline unsigned long
+__cmpxchg_u16(volatile unsigned short *p, unsigned long old, unsigned long new)
+{
+ unsigned int prev;
+
+ __asm__ __volatile__ (
+ PPC_ATOMIC_ENTRY_BARRIER
+"1: lharx %0,0,%2 # __cmpxchg_u16\n\
+ cmpw 0,%0,%3\n\
+ bne- 2f\n"
+" sthcx. %4,0,%2\n\
+ bne- 1b"
+ PPC_ATOMIC_EXIT_BARRIER
+ "\n\
+2:"
+ : "=&r" (prev), "+m" (*p)
+ : "r" (p), "r" (old), "r" (new)
+ : "cc", "memory");
+
+ return prev;
+}
+
+static __always_inline unsigned long
+__cmpxchg_u16_local(volatile unsigned short *p, unsigned long old,
+ unsigned long new)
+{
+ unsigned int prev;
+
+ __asm__ __volatile__ (
+"1: lharx %0,0,%2 # __cmpxchg_u16\n\
+ cmpw 0,%0,%3\n\
+ bne- 2f\n"
+" sthcx. %4,0,%2\n\
+ bne- 1b"
+ "\n\
+2:"
+ : "=&r" (prev), "+m" (*p)
+ : "r" (p), "r" (old), "r" (new)
+ : "cc", "memory");
+
+ return prev;
+}
+
+static __always_inline unsigned long
+__cmpxchg_u16_relaxed(u16 *p, unsigned long old, unsigned long new)
+{
+ unsigned long prev;
+
+ __asm__ __volatile__ (
+"1: lharx %0,0,%2 # __cmpxchg_u16_relaxed\n"
+" cmpw 0,%0,%3\n"
+" bne- 2f\n"
+" sthcx. %4,0,%2\n"
+" bne- 1b\n"
+"2:"
+ : "=&r" (prev), "+m" (*p)
+ : "r" (p), "r" (old), "r" (new)
+ : "cc");
+
+ return prev;
+}
+
+static __always_inline unsigned long
+__cmpxchg_u16_acquire(u16 *p, unsigned long old, unsigned long new)
+{
+ unsigned long prev;
+
+ __asm__ __volatile__ (
+"1: lharx %0,0,%2 # __cmpxchg_u16_acquire\n"
+" cmpw 0,%0,%3\n"
+" bne- 2f\n"
+" sthcx. %4,0,%2\n"
+" bne- 1b\n"
+ PPC_ACQUIRE_BARRIER
+ "\n"
+"2:"
+ : "=&r" (prev), "+m" (*p)
+ : "r" (p), "r" (old), "r" (new)
+ : "cc", "memory");
+
+ return prev;
+}
+#endif
static __always_inline unsigned long
__cmpxchg_u32(volatile unsigned int *p, unsigned long old, unsigned long new)
diff --git a/arch/powerpc/platforms/Kconfig.cputype b/arch/powerpc/platforms/Kconfig.cputype
index c194c4ae8bc7..2f8c8d61dba4 100644
--- a/arch/powerpc/platforms/Kconfig.cputype
+++ b/arch/powerpc/platforms/Kconfig.cputype
@@ -118,6 +118,7 @@ config GENERIC_CPU
bool "Generic (POWER8 and above)"
depends on PPC64 && CPU_LITTLE_ENDIAN
select ARCH_HAS_FAST_MULTIPLIER
+ select PPC_LBARX_LWARX
config GENERIC_CPU
bool "Generic 32 bits powerpc"
@@ -139,16 +140,19 @@ config POWER7_CPU
bool "POWER7"
depends on PPC_BOOK3S_64
select ARCH_HAS_FAST_MULTIPLIER
+ select PPC_LBARX_LWARX
config POWER8_CPU
bool "POWER8"
depends on PPC_BOOK3S_64
select ARCH_HAS_FAST_MULTIPLIER
+ select PPC_LBARX_LWARX
config POWER9_CPU
bool "POWER9"
depends on PPC_BOOK3S_64
select ARCH_HAS_FAST_MULTIPLIER
+ select PPC_LBARX_LWARX
config E5500_CPU
bool "Freescale e5500"
@@ -157,6 +161,7 @@ config E5500_CPU
config E6500_CPU
bool "Freescale e6500"
depends on E500
+ select PPC_LBARX_LWARX
config 860_CPU
bool "8xx family"
--
2.23.0
^ permalink raw reply related
* Re: [PATCH] ASoC: fsl_aud2htx: Remove dev_err() usage after platform_get_irq()
From: Nicolin Chen @ 2020-11-07 2:28 UTC (permalink / raw)
To: Shengjiu Wang
Cc: alsa-devel, timur, Xiubo.Lee, linuxppc-dev, tiwai, perex, broonie,
festevam, linux-kernel
In-Reply-To: <1604715643-29507-1-git-send-email-shengjiu.wang@nxp.com>
On Sat, Nov 07, 2020 at 10:20:43AM +0800, Shengjiu Wang wrote:
> platform_get_irq() would print error message internally, so dev_err()
> after platform_get_irq() is not needed
>
> Signed-off-by: Shengjiu Wang <shengjiu.wang@nxp.com>
Acked-by: Nicolin Chen <nicoleotsuka@gmail.com>
^ permalink raw reply
* [RFC PATCH] powerpc: show registers when unwinding interrupt frames
From: Nicholas Piggin @ 2020-11-07 2:33 UTC (permalink / raw)
To: linuxppc-dev; +Cc: Nicholas Piggin
It's often useful to know the register state for interrupts in
the stack frame. In the below example (with this patch applied),
the important information is the state of the page fault.
A blatant case like this probably rather should have the page
fault regs passed down to the warning, but quite often there are
less obvious cases where an interrupt shows up that might give
some more clues.
The downside is longer and more complex bug output.
Bug: Write fault blocked by AMR!
WARNING: CPU: 0 PID: 72 at arch/powerpc/include/asm/book3s/64/kup-radix.h:164 __do_page_fault+0x880/0xa90
Modules linked in:
CPU: 0 PID: 72 Comm: systemd-gpt-aut Not tainted
NIP: c00000000006e2f0 LR: c00000000006e2ec CTR: 0000000000000000
REGS: c00000000a4f3420 TRAP: 0700
MSR: 8000000000021033 <SF,ME,IR,DR,RI,LE> CR: 28002840 XER: 20040000
CFAR: c000000000128be0 IRQMASK: 3
GPR00: c00000000006e2ec c00000000a4f36c0 c0000000014f0700 0000000000000020
GPR04: 0000000000000001 c000000001290f50 0000000000000001 c000000001290f80
GPR08: c000000001612b08 0000000000000000 0000000000000000 00000000ffffe0f7
GPR12: 0000000048002840 c0000000016e0000 c00c000000021c80 c000000000fd6f60
GPR16: 0000000000000000 c00000000a104698 0000000000000003 c0000000087f0000
GPR20: 0000000000000100 c0000000070330b8 0000000000000000 0000000000000004
GPR24: 0000000002000000 0000000000000300 0000000002000000 c00000000a5b0c00
GPR28: 0000000000000000 000000000a000000 00007fffb2a90038 c00000000a4f3820
NIP [c00000000006e2f0] __do_page_fault+0x880/0xa90
LR [c00000000006e2ec] __do_page_fault+0x87c/0xa90
Call Trace:
[c00000000a4f36c0] [c00000000006e2ec] __do_page_fault+0x87c/0xa90 (unreliable)
[c00000000a4f3780] [c000000000e1c034] do_page_fault+0x34/0x90
[c00000000a4f37b0] [c000000000008908] data_access_common_virt+0x158/0x1b0
--- interrupt: 300 at __copy_tofrom_user_base+0x9c/0x5a4
NIP: c00000000009b028 LR: c000000000802978 CTR: 0000000000000800
REGS: c00000000a4f3820 TRAP: 0300
MSR: 800000000280b033 <SF,VEC,VSX,EE,FP,ME,IR,DR,RI,LE> CR: 24004840 XER: 00000000
CFAR: c00000000009aff4 DAR: 00007fffb2a90038 DSISR: 0a000000 IRQMASK: 0
GPR00: 0000000000000000 c00000000a4f3ac0 c0000000014f0700 00007fffb2a90028
GPR04: c000000008720010 0000000000010000 0000000000000000 0000000000000000
GPR08: 0000000000000000 0000000000000000 0000000000000000 0000000000000001
GPR12: 0000000000004000 c0000000016e0000 c00c000000021c80 c000000000fd6f60
GPR16: 0000000000000000 c00000000a104698 0000000000000003 c0000000087f0000
GPR20: 0000000000000100 c0000000070330b8 0000000000000000 0000000000000004
GPR24: c00000000a4f3c80 c000000008720000 0000000000010000 0000000000000000
GPR28: 0000000000010000 0000000008720000 0000000000010000 c000000001515b98
NIP [c00000000009b028] __copy_tofrom_user_base+0x9c/0x5a4
LR [c000000000802978] copyout+0x68/0xc0
--- interrupt: 300
[c00000000a4f3af0] [c0000000008074b8] copy_page_to_iter+0x188/0x540
[c00000000a4f3b50] [c00000000035c678] generic_file_buffered_read+0x358/0xd80
[c00000000a4f3c40] [c0000000004c1e90] blkdev_read_iter+0x50/0x80
[c00000000a4f3c60] [c00000000045733c] new_sync_read+0x12c/0x1c0
[c00000000a4f3d00] [c00000000045a1f0] vfs_read+0x1d0/0x240
[c00000000a4f3d50] [c00000000045a7f4] ksys_read+0x84/0x140
[c00000000a4f3da0] [c000000000033a60] system_call_exception+0x100/0x280
[c00000000a4f3e10] [c00000000000c508] system_call_common+0xf8/0x2f8
Instruction dump:
eae10078 3be0000b 4bfff890 60420000 792917e1 4182ff18 3c82ffab 3884a5e0
3c62ffab 3863a6e8 480ba891 60000000 <0fe00000> 3be0000b 4bfff860 e93c0938
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
---
arch/powerpc/kernel/process.c | 20 ++++++++++++++------
1 file changed, 14 insertions(+), 6 deletions(-)
diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c
index ea36a29c8b01..799f00b32f74 100644
--- a/arch/powerpc/kernel/process.c
+++ b/arch/powerpc/kernel/process.c
@@ -1475,12 +1475,10 @@ static void print_msr_bits(unsigned long val)
#define LAST_VOLATILE 12
#endif
-void show_regs(struct pt_regs * regs)
+static void __show_regs(struct pt_regs *regs)
{
int i, trap;
- show_regs_print_info(KERN_DEFAULT);
-
printk("NIP: "REG" LR: "REG" CTR: "REG"\n",
regs->nip, regs->link, regs->ctr);
printk("REGS: %px TRAP: %04lx %s (%s)\n",
@@ -1522,6 +1520,12 @@ void show_regs(struct pt_regs * regs)
printk("NIP ["REG"] %pS\n", regs->nip, (void *)regs->nip);
printk("LR ["REG"] %pS\n", regs->link, (void *)regs->link);
}
+}
+
+void show_regs(struct pt_regs *regs)
+{
+ show_regs_print_info(KERN_DEFAULT);
+ __show_regs(regs);
show_stack(current, (unsigned long *) regs->gpr[1], KERN_DEFAULT);
if (!user_mode(regs))
show_instructions(regs);
@@ -2192,10 +2196,14 @@ void show_stack(struct task_struct *tsk, unsigned long *stack,
&& stack[STACK_FRAME_MARKER] == STACK_FRAME_REGS_MARKER) {
struct pt_regs *regs = (struct pt_regs *)
(sp + STACK_FRAME_OVERHEAD);
+
lr = regs->link;
- printk("%s--- interrupt: %lx at %pS\n LR = %pS\n",
- loglvl, regs->trap,
- (void *)regs->nip, (void *)lr);
+ printk("%s--- interrupt: %lx at %pS\n",
+ loglvl, regs->trap, (void *)regs->nip);
+ __show_regs(regs);
+ printk("%s--- interrupt: %lx\n",
+ loglvl, regs->trap);
+
firstframe = 1;
}
--
2.23.0
^ permalink raw reply related
* [PATCH] ASoC: fsl_aud2htx: Remove dev_err() usage after platform_get_irq()
From: Shengjiu Wang @ 2020-11-07 2:20 UTC (permalink / raw)
To: timur, nicoleotsuka, Xiubo.Lee, festevam, broonie, perex, tiwai,
alsa-devel
Cc: linuxppc-dev, linux-kernel
platform_get_irq() would print error message internally, so dev_err()
after platform_get_irq() is not needed
Signed-off-by: Shengjiu Wang <shengjiu.wang@nxp.com>
---
sound/soc/fsl/fsl_aud2htx.c | 5 +----
1 file changed, 1 insertion(+), 4 deletions(-)
diff --git a/sound/soc/fsl/fsl_aud2htx.c b/sound/soc/fsl/fsl_aud2htx.c
index 124aeb70f24e..4091ccc7c3e9 100644
--- a/sound/soc/fsl/fsl_aud2htx.c
+++ b/sound/soc/fsl/fsl_aud2htx.c
@@ -211,11 +211,8 @@ static int fsl_aud2htx_probe(struct platform_device *pdev)
}
irq = platform_get_irq(pdev, 0);
- if (irq < 0) {
- dev_err(&pdev->dev, "no irq for node %s\n",
- dev_name(&pdev->dev));
+ if (irq < 0)
return irq;
- }
ret = devm_request_irq(&pdev->dev, irq, fsl_aud2htx_isr, 0,
dev_name(&pdev->dev), aud2htx);
--
2.27.0
^ permalink raw reply related
* [PATCH v2] powerpc/64: irq replay remove decrementer overflow check
From: Nicholas Piggin @ 2020-11-07 1:43 UTC (permalink / raw)
To: linuxppc-dev; +Cc: Nicholas Piggin
This is way to catch some cases of decrementer overflow, when the
decrementer has underflowed an odd number of times, while MSR[EE] was
disabled.
With a typical small decrementer, a timer that fires when MSR[EE] is
disabled will be "lost" if MSR[EE] remains disabled for between 4.3 and
8.6 seconds after the timer expires. In any case, the decrementer
interrupt would be taken at 8.6 seconds and the timer would be found at
that point.
So this check is for catching extreme latency events, and it prevents
those latencies from being a further few seconds long. It's not obvious
this is a good tradeoff. This is already a watchdog magnitude event and
that situation is not improved a significantly with this check. For
large decrementers, it's useless.
Therefore remove this check, which avoids a mftb when enabling hard
disabled interrupts (e.g., when enabling after coming from hardware
interrupt handlers). Perhaps more importantly, it also removes the
clunky MSR[EE] vs PACA_IRQ_HARD_DIS incoherency in soft-interrupt replay
which simplifies the code.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
---
v2: Fixed 64e warnings
arch/powerpc/kernel/irq.c | 53 ++-------------------------
arch/powerpc/kernel/time.c | 9 ++---
arch/powerpc/platforms/powernv/opal.c | 2 +-
3 files changed, 8 insertions(+), 56 deletions(-)
diff --git a/arch/powerpc/kernel/irq.c b/arch/powerpc/kernel/irq.c
index 7d0f7682d01d..6b1eca53e36c 100644
--- a/arch/powerpc/kernel/irq.c
+++ b/arch/powerpc/kernel/irq.c
@@ -102,14 +102,6 @@ static inline notrace unsigned long get_irq_happened(void)
return happened;
}
-static inline notrace int decrementer_check_overflow(void)
-{
- u64 now = get_tb();
- u64 *next_tb = this_cpu_ptr(&decrementers_next_tb);
-
- return now >= *next_tb;
-}
-
#ifdef CONFIG_PPC_BOOK3E
/* This is called whenever we are re-enabling interrupts
@@ -142,35 +134,6 @@ notrace unsigned int __check_irq_replay(void)
trace_hardirqs_on();
trace_hardirqs_off();
- /*
- * We are always hard disabled here, but PACA_IRQ_HARD_DIS may
- * not be set, which means interrupts have only just been hard
- * disabled as part of the local_irq_restore or interrupt return
- * code. In that case, skip the decrementr check becaus it's
- * expensive to read the TB.
- *
- * HARD_DIS then gets cleared here, but it's reconciled later.
- * Either local_irq_disable will replay the interrupt and that
- * will reconcile state like other hard interrupts. Or interrupt
- * retur will replay the interrupt and in that case it sets
- * PACA_IRQ_HARD_DIS by hand (see comments in entry_64.S).
- */
- if (happened & PACA_IRQ_HARD_DIS) {
- local_paca->irq_happened &= ~PACA_IRQ_HARD_DIS;
-
- /*
- * We may have missed a decrementer interrupt if hard disabled.
- * Check the decrementer register in case we had a rollover
- * while hard disabled.
- */
- if (!(happened & PACA_IRQ_DEC)) {
- if (decrementer_check_overflow()) {
- local_paca->irq_happened |= PACA_IRQ_DEC;
- happened |= PACA_IRQ_DEC;
- }
- }
- }
-
if (happened & PACA_IRQ_DEC) {
local_paca->irq_happened &= ~PACA_IRQ_DEC;
return 0x900;
@@ -186,6 +149,9 @@ notrace unsigned int __check_irq_replay(void)
return 0x280;
}
+ if (happened & PACA_IRQ_HARD_DIS)
+ local_paca->irq_happened &= ~PACA_IRQ_HARD_DIS;
+
/* There should be nothing left ! */
BUG_ON(local_paca->irq_happened != 0);
@@ -229,18 +195,6 @@ void replay_soft_interrupts(void)
if (IS_ENABLED(CONFIG_PPC_IRQ_SOFT_MASK_DEBUG))
WARN_ON_ONCE(mfmsr() & MSR_EE);
- if (happened & PACA_IRQ_HARD_DIS) {
- /*
- * We may have missed a decrementer interrupt if hard disabled.
- * Check the decrementer register in case we had a rollover
- * while hard disabled.
- */
- if (!(happened & PACA_IRQ_DEC)) {
- if (decrementer_check_overflow())
- happened |= PACA_IRQ_DEC;
- }
- }
-
/*
* Force the delivery of pending soft-disabled interrupts on PS3.
* Any HV call will have this side effect.
@@ -345,6 +299,7 @@ notrace void arch_local_irq_restore(unsigned long mask)
if (IS_ENABLED(CONFIG_PPC_IRQ_SOFT_MASK_DEBUG))
WARN_ON_ONCE(!(mfmsr() & MSR_EE));
__hard_irq_disable();
+ local_paca->irq_happened |= PACA_IRQ_HARD_DIS;
} else {
/*
* We should already be hard disabled here. We had bugs
diff --git a/arch/powerpc/kernel/time.c b/arch/powerpc/kernel/time.c
index 74efe46f5532..7d372ff3504b 100644
--- a/arch/powerpc/kernel/time.c
+++ b/arch/powerpc/kernel/time.c
@@ -552,14 +552,11 @@ void timer_interrupt(struct pt_regs *regs)
struct pt_regs *old_regs;
u64 now;
- /* Some implementations of hotplug will get timer interrupts while
- * offline, just ignore these and we also need to set
- * decrementers_next_tb as MAX to make sure __check_irq_replay
- * don't replay timer interrupt when return, otherwise we'll trap
- * here infinitely :(
+ /*
+ * Some implementations of hotplug will get timer interrupts while
+ * offline, just ignore these.
*/
if (unlikely(!cpu_online(smp_processor_id()))) {
- *next_tb = ~(u64)0;
set_dec(decrementer_max);
return;
}
diff --git a/arch/powerpc/platforms/powernv/opal.c b/arch/powerpc/platforms/powernv/opal.c
index d95954ad4c0a..c61c3b62c8c6 100644
--- a/arch/powerpc/platforms/powernv/opal.c
+++ b/arch/powerpc/platforms/powernv/opal.c
@@ -731,7 +731,7 @@ int opal_hmi_exception_early2(struct pt_regs *regs)
return 1;
}
-/* HMI exception handler called in virtual mode during check_irq_replay. */
+/* HMI exception handler called in virtual mode when irqs are next enabled. */
int opal_handle_hmi_exception(struct pt_regs *regs)
{
/*
--
2.23.0
^ permalink raw reply related
* Re: [PATCH net-next] Revert ibmvnic merge do_change_param_reset into do_reset
From: patchwork-bot+netdevbpf @ 2020-11-07 1:40 UTC (permalink / raw)
To: Dany Madden; +Cc: netdev, linuxppc-dev, davem
In-Reply-To: <20201106191745.1679846-1-drt@linux.ibm.com>
Hello:
This patch was applied to netdev/net-next.git (refs/heads/master):
On Fri, 6 Nov 2020 14:17:45 -0500 you wrote:
> This reverts commit 16b5f5ce351f8709a6b518cc3cbf240c378305bf
> where it restructures do_reset. There are patches being tested that
> would require major rework if this is committed first.
>
> We will resend this after the other patches have been applied.
>
> Signed-off-by: Dany Madden <drt@linux.ibm.com>
>
> [...]
Here is the summary with links:
- [net-next] Revert ibmvnic merge do_change_param_reset into do_reset
https://git.kernel.org/netdev/net-next/c/9f32c27eb4fc
You are awesome, thank you!
--
Deet-doot-dot, I am a bot.
https://korg.docs.kernel.org/patchwork/pwbot.html
^ permalink raw reply
* Re: [PATCH net-next] Revert ibmvnic merge do_change_param_reset into do_reset
From: Jakub Kicinski @ 2020-11-07 1:30 UTC (permalink / raw)
To: Dany Madden; +Cc: netdev, linuxppc-dev, davem
In-Reply-To: <20201106191745.1679846-1-drt@linux.ibm.com>
On Fri, 6 Nov 2020 14:17:45 -0500 Dany Madden wrote:
> This reverts commit 16b5f5ce351f8709a6b518cc3cbf240c378305bf
> where it restructures do_reset. There are patches being tested that
> would require major rework if this is committed first.
>
> We will resend this after the other patches have been applied.
>
> Signed-off-by: Dany Madden <drt@linux.ibm.com>
Applied, thanks.
^ permalink raw reply
* Re: [PATCH v3 2/2] ASoC: fsl_aud2htx: Add aud2htx module driver
From: Nicolin Chen @ 2020-11-06 21:38 UTC (permalink / raw)
To: Shengjiu Wang
Cc: open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS,
alsa-devel, Timur Tabi, Xiubo Li, Fabio Estevam, Shengjiu Wang,
Liam Girdwood, Takashi Iwai, Rob Herring, Mark Brown,
linuxppc-dev, linux-kernel
In-Reply-To: <CAA+D8ANrkgXR+8JGp4fPLvkKJ05EqQyShWTO+xWpPOycPT9Tyw@mail.gmail.com>
On Fri, Nov 06, 2020 at 10:51:03AM +0800, Shengjiu Wang wrote:
> > > +static irqreturn_t fsl_aud2htx_isr(int irq, void *dev_id)
> > > +{
> > > + return IRQ_HANDLED;
> >
> > Empty isr? Perhaps can drop the request_irq() at all?
>
> I'd like to keep this for future enhancement, what do you think?
I believe that usually it will be a common practice that we add
when we use it -- exaggerating the situation, just like you will
not actually add an empty driver for future enhancement.
But I am not strongly against it, as it's small. Since Mark has
applied it, let's keep it then.
^ permalink raw reply
* Re: [PATCH v3 1/2] ASoC: dt-bindings: fsl_aud2htx: Add binding doc for aud2htx module
From: Nicolin Chen @ 2020-11-06 21:27 UTC (permalink / raw)
To: Mark Brown
Cc: devicetree, alsa-devel, timur, Xiubo.Lee, lgirdwood,
Shengjiu Wang, linuxppc-dev, tiwai, perex, robh+dt, festevam,
linux-kernel
In-Reply-To: <20201106122013.GB49612@sirena.org.uk>
On Fri, Nov 06, 2020 at 12:20:13PM +0000, Mark Brown wrote:
> On Fri, Nov 06, 2020 at 11:54:23AM +0000, Mark Brown wrote:
> > On Mon, 2 Nov 2020 09:52:26 +0800, Shengjiu Wang wrote:
> > > AUD2HTX (Audio Subsystem TO HDMI TX Subsystem) is a new
> > > IP module found on i.MX8MP.
> >
> > Applied to
> >
> > https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git for-next
>
> Sorry, looks like me queueing this raced with the review comments coming
> in. I think the review commments are small enough that it'll be OK to
> fix incrementally?
Yes. I am okay if we move forward with this version.
Thanks
^ permalink raw reply
* [PATCH v2 23/23] mtd: devices: powernv_flash: Add function names to headers and fix 'dev'
From: Lee Jones @ 2020-11-06 21:36 UTC (permalink / raw)
To: lee.jones
Cc: Vignesh Raghavendra, Richard Weinberger, Miquel Raynal,
linux-kernel, Paul Mackerras, linux-mtd, linuxppc-dev
In-Reply-To: <20201106213655.1838861-1-lee.jones@linaro.org>
Fixes the following W=1 kernel build warning(s):
drivers/mtd/devices/powernv_flash.c:129: warning: Cannot understand * @mtd: the device
drivers/mtd/devices/powernv_flash.c:145: warning: Cannot understand * @mtd: the device
drivers/mtd/devices/powernv_flash.c:161: warning: Cannot understand * @mtd: the device
drivers/mtd/devices/powernv_flash.c:184: warning: Function parameter or member 'dev' not described in 'powernv_flash_set_driver_info'
Cc: Miquel Raynal <miquel.raynal@bootlin.com>
Cc: Richard Weinberger <richard@nod.at>
Cc: Vignesh Raghavendra <vigneshr@ti.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: linux-mtd@lists.infradead.org
Cc: linuxppc-dev@lists.ozlabs.org
Signed-off-by: Lee Jones <lee.jones@linaro.org>
---
drivers/mtd/devices/powernv_flash.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/drivers/mtd/devices/powernv_flash.c b/drivers/mtd/devices/powernv_flash.c
index 0b757d9ba2f6b..6950a87648151 100644
--- a/drivers/mtd/devices/powernv_flash.c
+++ b/drivers/mtd/devices/powernv_flash.c
@@ -126,6 +126,7 @@ static int powernv_flash_async_op(struct mtd_info *mtd, enum flash_op op,
}
/**
+ * powernv_flash_read
* @mtd: the device
* @from: the offset to read from
* @len: the number of bytes to read
@@ -142,6 +143,7 @@ static int powernv_flash_read(struct mtd_info *mtd, loff_t from, size_t len,
}
/**
+ * powernv_flash_write
* @mtd: the device
* @to: the offset to write to
* @len: the number of bytes to write
@@ -158,6 +160,7 @@ static int powernv_flash_write(struct mtd_info *mtd, loff_t to, size_t len,
}
/**
+ * powernv_flash_erase
* @mtd: the device
* @erase: the erase info
* Returns 0 if erase successful or -ERRNO if an error occurred
@@ -176,7 +179,7 @@ static int powernv_flash_erase(struct mtd_info *mtd, struct erase_info *erase)
/**
* powernv_flash_set_driver_info - Fill the mtd_info structure and docg3
- * structure @pdev: The platform device
+ * @dev: The device structure
* @mtd: The structure to fill
*/
static int powernv_flash_set_driver_info(struct device *dev,
--
2.25.1
^ permalink raw reply related
* [PATCH v2 00/23] Rid W=1 warnings in MTD
From: Lee Jones @ 2020-11-06 21:36 UTC (permalink / raw)
To: lee.jones
Cc: Boris BREZILLON, Vignesh Raghavendra, Sergey Lapin, dri-devel,
linux-mtd, Frieder Schrempf, Miquel Raynal, Choudary Kalluri,
Robert Jarzmik, Sumit Semwal, Paul Mackerras, Dan Brown,
linux-samsung-soc, Adrian Hunter, Kamal Dasu, Krzysztof Kozlowski,
Thomas Gleixner, Chen-Yu Tsai, Kukjin Kim,
bcm-kernel-feedback-list, linux-media, Tudor Ambarus,
Maxime Ripard, linaro-mm-sig, Dmitriy B, Thomas Gleixner,
Jochen Schäuble, Naga Sureshkumar Relli, Yoshio Furuyama,
Nicolas Pitre, linuxppc-dev, linux-kernel, Ben Dooks,
Kyungmin Park, Boris Brezillon, Qiang Yu, Philipp Zabel,
Richard Weinberger, Jian Zhang, Brian Norris, David Woodhouse,
Christian König
This set is part of a larger effort attempting to clean-up W=1
kernel builds, which are currently overwhelmingly riddled with
niggly little warnings.
v1 => v2:
- Added tags
- Satisfied Miquel's review comments
Lee Jones (23):
mtd: mtdpart: Fix misdocumented function parameter 'mtd'
mtd: devices: phram: File headers are not good candidates for
kernel-doc
mtd: nand: onenand: onenand_base: Fix expected kernel-doc formatting
mtd: devices: docg3: Fix kernel-doc 'bad line' and 'excessive doc'
issues
mtd: mtdcore: Fix misspelled function parameter 'section'
mtd: nand: onenand: onenand_bbt: Fix expected kernel-doc formatting
mtd: spi-nor: controllers: hisi-sfc: Demote non-conformant kernel-doc
mtd: ubi: build: Document 'ubi_num' in struct mtd_dev_param
mtd: nand: spi: toshiba: Demote non-conformant kernel-doc header
mtd: ubi: kapi: Correct documentation for 'ubi_leb_read_sg's 'sgl'
parameter
mtd: ubi: eba: Fix a couple of misdocumentation issues
mtd: ubi: wl: Fix a couple of kernel-doc issues
mtd: nand: raw: brcmnand: brcmnand: Demote non-conformant kernel-doc
headers
mtd: ubi: gluebi: Fix misnamed function parameter documentation
mtd: nand: raw: diskonchip: Marking unused variables as
__always_unused
mtd: nand: raw: cafe_nand: Remove superfluous param doc and add
another
mtd: nand: raw: s3c2410: Add documentation for 2 missing struct
members
mtd: nand: raw: omap_elm: Finish half populated function header,
demote empty ones
mtd: nand: raw: omap2: Fix a bunch of kernel-doc misdemeanours
mtd: nand: raw: sunxi_nand: Document 'sunxi_nfc's 'caps' member
mtd: nand: raw: arasan-nand-controller: Document 'anfc_op's 'buf'
member
mtd: nand: onenand: onenand_base: Fix some kernel-doc misdemeanours
mtd: devices: powernv_flash: Add function names to headers and fix
'dev'
drivers/mtd/devices/docg3.c | 5 +-
drivers/mtd/devices/phram.c | 2 +-
drivers/mtd/devices/powernv_flash.c | 5 +-
drivers/mtd/mtdcore.c | 2 +-
drivers/mtd/mtdpart.c | 2 +-
drivers/mtd/nand/onenand/onenand_base.c | 444 +++++++++---------
drivers/mtd/nand/onenand/onenand_bbt.c | 32 +-
drivers/mtd/nand/raw/arasan-nand-controller.c | 1 +
drivers/mtd/nand/raw/brcmnand/brcmnand.c | 6 +-
drivers/mtd/nand/raw/cafe_nand.c | 2 +-
drivers/mtd/nand/raw/diskonchip.c | 4 +-
drivers/mtd/nand/raw/omap2.c | 18 +-
drivers/mtd/nand/raw/omap_elm.c | 7 +-
drivers/mtd/nand/raw/s3c2410.c | 4 +-
drivers/mtd/nand/raw/sunxi_nand.c | 1 +
drivers/mtd/nand/spi/toshiba.c | 2 +-
drivers/mtd/spi-nor/controllers/hisi-sfc.c | 2 +-
drivers/mtd/ubi/build.c | 1 +
drivers/mtd/ubi/eba.c | 3 +-
drivers/mtd/ubi/gluebi.c | 2 +-
drivers/mtd/ubi/kapi.c | 2 +-
drivers/mtd/ubi/wl.c | 3 +-
22 files changed, 278 insertions(+), 272 deletions(-)
Cc: Adrian Hunter <ext-adrian.hunter@nokia.com>
Cc: bcm-kernel-feedback-list@broadcom.com
Cc: Ben Dooks <ben@simtec.co.uk>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Boris BREZILLON <b.brezillon.dev@gmail.com>
Cc: Boris Brezillon <boris.brezillon@collabora.com>
Cc: Brian Norris <computersforpeace@gmail.com>
Cc: Chen-Yu Tsai <wens@csie.org>
Cc: Choudary Kalluri <punnaia@xilinx.com>
Cc: "Christian König" <christian.koenig@amd.com>
Cc: Dan Brown <dan_brown@ieee.org>
Cc: David Woodhouse <dwmw2@infradead.org>
Cc: Dmitriy B <rzk333@gmail.com>
Cc: dri-devel@lists.freedesktop.org
Cc: Frieder Schrempf <frieder.schrempf@kontron.de>
Cc: Jian Zhang <jzhang@ti.com>
Cc: "Jochen Schäuble" <psionic@psionic.de>
Cc: Kamal Dasu <kdasu.kdev@gmail.com>
Cc: Krzysztof Kozlowski <krzk@kernel.org>
Cc: Kukjin Kim <kgene@kernel.org>
Cc: Kyungmin Park <kyungmin.park@samsung.com>
Cc: linaro-mm-sig@lists.linaro.org
Cc: linux-media@vger.kernel.org
Cc: linux-mtd@lists.infradead.org
Cc: linuxppc-dev@lists.ozlabs.org
Cc: linux-samsung-soc@vger.kernel.org
Cc: Maxime Ripard <mripard@kernel.org>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Miquel Raynal <miquel.raynal@bootlin.com>
Cc: Naga Sureshkumar Relli <nagasure@xilinx.com>
Cc: Nicolas Pitre <nico@fluxnic.net>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Philipp Zabel <p.zabel@pengutronix.de>
Cc: Qiang Yu <yuq825@gmail.com>
Cc: Richard Weinberger <richard@nod.at>
Cc: Robert Jarzmik <robert.jarzmik@free.fr>
Cc: Sergey Lapin <slapin@ossfans.org>
Cc: Sumit Semwal <sumit.semwal@linaro.org>
Cc: Thomas Gleixner <gleixner@linutronix.de>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Tudor Ambarus <tudor.ambarus@microchip.com>
Cc: Vignesh Raghavendra <vigneshr@ti.com>
Cc: Yoshio Furuyama <ytc-mb-yfuruyama7@kioxia.com>
--
2.25.1
^ permalink raw reply
* Re: [PATCH net-next] Revert ibmvnic merge do_change_param_reset into do_reset
From: ljp @ 2020-11-06 21:02 UTC (permalink / raw)
To: Jakub Kicinski
Cc: wvoigt, netdev, Linuxppc-dev, Dany Madden, linuxppc-dev, davem
In-Reply-To: <20201106114208.4b0e8eec@kicinski-fedora-pc1c0hjn.dhcp.thefacebook.com>
On 2020-11-06 13:42, Jakub Kicinski wrote:
> On Fri, 06 Nov 2020 13:30:25 -0600 ljp wrote:
>> On 2020-11-06 13:17, Dany Madden wrote:
>> > This reverts commit 16b5f5ce351f8709a6b518cc3cbf240c378305bf
>> > where it restructures do_reset. There are patches being tested that
>> > would require major rework if this is committed first.
>> >
>> > We will resend this after the other patches have been applied.
>>
>> I discussed with my manager, and he has agreed not revert this one
>> since it is in the net-next tree and will not affect net tree for
>> current bug fix patches.
>
> We merge net into net-next periodically (~every week or so) so if you
> keep making changes to both branches I will have to deal with the
> fallout.
>
> I'm assuming that the resolution for the current conflict which Stephen
> Rothwell sent from linux-next is correct. Please confirm.
>
> I will resolve it like he did when Linus pulls from net (hopefully
> later today).
>
> But if you know you have more fixes I'd rather revert this, get all the
> relevant fixed into net, wait for net to be merged into net-next and
> then redo the refactoring.
>
> Hope that makes sense.
Jakub,
We had further discussion in the team based on your comments above.
You can revert it for now.
Thanks for your efforts.
Lijun
^ permalink raw reply
* Re: [PATCH net-next] Revert ibmvnic merge do_change_param_reset into do_reset
From: ljp @ 2020-11-06 20:15 UTC (permalink / raw)
To: Jakub Kicinski
Cc: wvoigt, netdev, Linuxppc-dev, Dany Madden, linuxppc-dev, davem
In-Reply-To: <20201106114208.4b0e8eec@kicinski-fedora-pc1c0hjn.dhcp.thefacebook.com>
On 2020-11-06 13:42, Jakub Kicinski wrote:
> On Fri, 06 Nov 2020 13:30:25 -0600 ljp wrote:
>> On 2020-11-06 13:17, Dany Madden wrote:
>> > This reverts commit 16b5f5ce351f8709a6b518cc3cbf240c378305bf
>> > where it restructures do_reset. There are patches being tested that
>> > would require major rework if this is committed first.
>> >
>> > We will resend this after the other patches have been applied.
>>
>> I discussed with my manager, and he has agreed not revert this one
>> since it is in the net-next tree and will not affect net tree for
>> current bug fix patches.
>
> We merge net into net-next periodically (~every week or so) so if you
> keep making changes to both branches I will have to deal with the
> fallout.
>
> I'm assuming that the resolution for the current conflict which Stephen
> Rothwell sent from linux-next is correct. Please confirm.
That fix is correct.
>
> I will resolve it like he did when Linus pulls from net (hopefully
> later today).
>
> But if you know you have more fixes I'd rather revert this, get all the
> relevant fixed into net, wait for net to be merged into net-next and
> then redo the refactoring.
>
> Hope that makes sense.
^ permalink raw reply
* Re: [PATCH net-next] Revert ibmvnic merge do_change_param_reset into do_reset
From: Jakub Kicinski @ 2020-11-06 19:42 UTC (permalink / raw)
To: ljp; +Cc: wvoigt, netdev, Linuxppc-dev, Dany Madden, linuxppc-dev, davem
In-Reply-To: <0ff353cbada91b031d1bbae250a975d5@linux.vnet.ibm.com>
On Fri, 06 Nov 2020 13:30:25 -0600 ljp wrote:
> On 2020-11-06 13:17, Dany Madden wrote:
> > This reverts commit 16b5f5ce351f8709a6b518cc3cbf240c378305bf
> > where it restructures do_reset. There are patches being tested that
> > would require major rework if this is committed first.
> >
> > We will resend this after the other patches have been applied.
>
> I discussed with my manager, and he has agreed not revert this one
> since it is in the net-next tree and will not affect net tree for
> current bug fix patches.
We merge net into net-next periodically (~every week or so) so if you
keep making changes to both branches I will have to deal with the
fallout.
I'm assuming that the resolution for the current conflict which Stephen
Rothwell sent from linux-next is correct. Please confirm.
I will resolve it like he did when Linus pulls from net (hopefully
later today).
But if you know you have more fixes I'd rather revert this, get all the
relevant fixed into net, wait for net to be merged into net-next and
then redo the refactoring.
Hope that makes sense.
^ permalink raw reply
* Re: [PATCH net-next] Revert ibmvnic merge do_change_param_reset into do_reset
From: ljp @ 2020-11-06 19:30 UTC (permalink / raw)
To: Dany Madden, wvoigt; +Cc: netdev, linuxppc-dev, davem, Linuxppc-dev
In-Reply-To: <20201106191745.1679846-1-drt@linux.ibm.com>
On 2020-11-06 13:17, Dany Madden wrote:
> This reverts commit 16b5f5ce351f8709a6b518cc3cbf240c378305bf
> where it restructures do_reset. There are patches being tested that
> would require major rework if this is committed first.
>
> We will resend this after the other patches have been applied.
I discussed with my manager, and he has agreed not revert this one
since it is in the net-next tree and will not affect net tree for
current bug fix patches.
Sorry for the confusion.
Thanks,
Lijun
>
> Signed-off-by: Dany Madden <drt@linux.ibm.com>
> ---
> drivers/net/ethernet/ibm/ibmvnic.c | 147 ++++++++++++++++++++---------
> 1 file changed, 104 insertions(+), 43 deletions(-)
>
> diff --git a/drivers/net/ethernet/ibm/ibmvnic.c
> b/drivers/net/ethernet/ibm/ibmvnic.c
> index f4167de30461..af4dfbe28d56 100644
> --- a/drivers/net/ethernet/ibm/ibmvnic.c
> +++ b/drivers/net/ethernet/ibm/ibmvnic.c
> @@ -1826,6 +1826,86 @@ static int ibmvnic_set_mac(struct net_device
> *netdev, void *p)
> return rc;
> }
>
> +/**
> + * do_change_param_reset returns zero if we are able to keep
> processing reset
> + * events, or non-zero if we hit a fatal error and must halt.
> + */
> +static int do_change_param_reset(struct ibmvnic_adapter *adapter,
> + struct ibmvnic_rwi *rwi,
> + u32 reset_state)
> +{
> + struct net_device *netdev = adapter->netdev;
> + int i, rc;
> +
> + netdev_dbg(adapter->netdev, "Change param resetting driver (%d)\n",
> + rwi->reset_reason);
> +
> + netif_carrier_off(netdev);
> + adapter->reset_reason = rwi->reset_reason;
> +
> + ibmvnic_cleanup(netdev);
> +
> + if (reset_state == VNIC_OPEN) {
> + rc = __ibmvnic_close(netdev);
> + if (rc)
> + return rc;
> + }
> +
> + release_resources(adapter);
> + release_sub_crqs(adapter, 1);
> + release_crq_queue(adapter);
> +
> + adapter->state = VNIC_PROBED;
> +
> + rc = init_crq_queue(adapter);
> +
> + if (rc) {
> + netdev_err(adapter->netdev,
> + "Couldn't initialize crq. rc=%d\n", rc);
> + return rc;
> + }
> +
> + rc = ibmvnic_reset_init(adapter, true);
> + if (rc)
> + return IBMVNIC_INIT_FAILED;
> +
> + /* If the adapter was in PROBE state prior to the reset,
> + * exit here.
> + */
> + if (reset_state == VNIC_PROBED)
> + return 0;
> +
> + rc = ibmvnic_login(netdev);
> + if (rc) {
> + adapter->state = reset_state;
> + return rc;
> + }
> +
> + rc = init_resources(adapter);
> + if (rc)
> + return rc;
> +
> + ibmvnic_disable_irqs(adapter);
> +
> + adapter->state = VNIC_CLOSED;
> +
> + if (reset_state == VNIC_CLOSED)
> + return 0;
> +
> + rc = __ibmvnic_open(netdev);
> + if (rc)
> + return IBMVNIC_OPEN_FAILED;
> +
> + /* refresh device's multicast list */
> + ibmvnic_set_multi(netdev);
> +
> + /* kick napi */
> + for (i = 0; i < adapter->req_rx_queues; i++)
> + napi_schedule(&adapter->napi[i]);
> +
> + return 0;
> +}
> +
> /**
> * do_reset returns zero if we are able to keep processing reset
> events, or
> * non-zero if we hit a fatal error and must halt.
> @@ -1841,12 +1921,10 @@ static int do_reset(struct ibmvnic_adapter
> *adapter,
> netdev_dbg(adapter->netdev, "Re-setting driver (%d)\n",
> rwi->reset_reason);
>
> - adapter->reset_reason = rwi->reset_reason;
> - /* requestor of VNIC_RESET_CHANGE_PARAM already has the rtnl lock */
> - if (!(adapter->reset_reason == VNIC_RESET_CHANGE_PARAM))
> - rtnl_lock();
> + rtnl_lock();
>
> netif_carrier_off(netdev);
> + adapter->reset_reason = rwi->reset_reason;
>
> old_num_rx_queues = adapter->req_rx_queues;
> old_num_tx_queues = adapter->req_tx_queues;
> @@ -1858,37 +1936,25 @@ static int do_reset(struct ibmvnic_adapter
> *adapter,
> if (reset_state == VNIC_OPEN &&
> adapter->reset_reason != VNIC_RESET_MOBILITY &&
> adapter->reset_reason != VNIC_RESET_FAILOVER) {
> - if (adapter->reset_reason == VNIC_RESET_CHANGE_PARAM) {
> - rc = __ibmvnic_close(netdev);
> - if (rc)
> - goto out;
> - } else {
> - adapter->state = VNIC_CLOSING;
> -
> - /* Release the RTNL lock before link state change and
> - * re-acquire after the link state change to allow
> - * linkwatch_event to grab the RTNL lock and run during
> - * a reset.
> - */
> - rtnl_unlock();
> - rc = set_link_state(adapter, IBMVNIC_LOGICAL_LNK_DN);
> - rtnl_lock();
> - if (rc)
> - goto out;
> + adapter->state = VNIC_CLOSING;
>
> - if (adapter->state != VNIC_CLOSING) {
> - rc = -1;
> - goto out;
> - }
> + /* Release the RTNL lock before link state change and
> + * re-acquire after the link state change to allow
> + * linkwatch_event to grab the RTNL lock and run during
> + * a reset.
> + */
> + rtnl_unlock();
> + rc = set_link_state(adapter, IBMVNIC_LOGICAL_LNK_DN);
> + rtnl_lock();
> + if (rc)
> + goto out;
>
> - adapter->state = VNIC_CLOSED;
> + if (adapter->state != VNIC_CLOSING) {
> + rc = -1;
> + goto out;
> }
> - }
>
> - if (adapter->reset_reason == VNIC_RESET_CHANGE_PARAM) {
> - release_resources(adapter);
> - release_sub_crqs(adapter, 1);
> - release_crq_queue(adapter);
> + adapter->state = VNIC_CLOSED;
> }
>
> if (adapter->reset_reason != VNIC_RESET_NON_FATAL) {
> @@ -1897,9 +1963,7 @@ static int do_reset(struct ibmvnic_adapter
> *adapter,
> */
> adapter->state = VNIC_PROBED;
>
> - if (adapter->reset_reason == VNIC_RESET_CHANGE_PARAM) {
> - rc = init_crq_queue(adapter);
> - } else if (adapter->reset_reason == VNIC_RESET_MOBILITY) {
> + if (adapter->reset_reason == VNIC_RESET_MOBILITY) {
> rc = ibmvnic_reenable_crq_queue(adapter);
> release_sub_crqs(adapter, 1);
> } else {
> @@ -1939,11 +2003,7 @@ static int do_reset(struct ibmvnic_adapter
> *adapter,
> goto out;
> }
>
> - if (adapter->reset_reason == VNIC_RESET_CHANGE_PARAM) {
> - rc = init_resources(adapter);
> - if (rc)
> - goto out;
> - } else if (adapter->req_rx_queues != old_num_rx_queues ||
> + if (adapter->req_rx_queues != old_num_rx_queues ||
> adapter->req_tx_queues != old_num_tx_queues ||
> adapter->req_rx_add_entries_per_subcrq !=
> old_num_rx_slots ||
> @@ -2004,9 +2064,7 @@ static int do_reset(struct ibmvnic_adapter
> *adapter,
> rc = 0;
>
> out:
> - /* requestor of VNIC_RESET_CHANGE_PARAM should still hold the rtnl
> lock */
> - if (!(adapter->reset_reason == VNIC_RESET_CHANGE_PARAM))
> - rtnl_unlock();
> + rtnl_unlock();
>
> return rc;
> }
> @@ -2140,7 +2198,10 @@ static void __ibmvnic_reset(struct work_struct
> *work)
> }
> spin_unlock_irqrestore(&adapter->state_lock, flags);
>
> - if (adapter->force_reset_recovery) {
> + if (rwi->reset_reason == VNIC_RESET_CHANGE_PARAM) {
> + /* CHANGE_PARAM requestor holds rtnl_lock */
> + rc = do_change_param_reset(adapter, rwi, reset_state);
> + } else if (adapter->force_reset_recovery) {
> /* Transport event occurred during previous reset */
> if (adapter->wait_for_reset) {
> /* Previous was CHANGE_PARAM; caller locked */
^ permalink raw reply
* [PATCH net-next] Revert ibmvnic merge do_change_param_reset into do_reset
From: Dany Madden @ 2020-11-06 19:17 UTC (permalink / raw)
To: davem; +Cc: Dany Madden, netdev, linuxppc-dev
This reverts commit 16b5f5ce351f8709a6b518cc3cbf240c378305bf
where it restructures do_reset. There are patches being tested that
would require major rework if this is committed first.
We will resend this after the other patches have been applied.
Signed-off-by: Dany Madden <drt@linux.ibm.com>
---
drivers/net/ethernet/ibm/ibmvnic.c | 147 ++++++++++++++++++++---------
1 file changed, 104 insertions(+), 43 deletions(-)
diff --git a/drivers/net/ethernet/ibm/ibmvnic.c b/drivers/net/ethernet/ibm/ibmvnic.c
index f4167de30461..af4dfbe28d56 100644
--- a/drivers/net/ethernet/ibm/ibmvnic.c
+++ b/drivers/net/ethernet/ibm/ibmvnic.c
@@ -1826,6 +1826,86 @@ static int ibmvnic_set_mac(struct net_device *netdev, void *p)
return rc;
}
+/**
+ * do_change_param_reset returns zero if we are able to keep processing reset
+ * events, or non-zero if we hit a fatal error and must halt.
+ */
+static int do_change_param_reset(struct ibmvnic_adapter *adapter,
+ struct ibmvnic_rwi *rwi,
+ u32 reset_state)
+{
+ struct net_device *netdev = adapter->netdev;
+ int i, rc;
+
+ netdev_dbg(adapter->netdev, "Change param resetting driver (%d)\n",
+ rwi->reset_reason);
+
+ netif_carrier_off(netdev);
+ adapter->reset_reason = rwi->reset_reason;
+
+ ibmvnic_cleanup(netdev);
+
+ if (reset_state == VNIC_OPEN) {
+ rc = __ibmvnic_close(netdev);
+ if (rc)
+ return rc;
+ }
+
+ release_resources(adapter);
+ release_sub_crqs(adapter, 1);
+ release_crq_queue(adapter);
+
+ adapter->state = VNIC_PROBED;
+
+ rc = init_crq_queue(adapter);
+
+ if (rc) {
+ netdev_err(adapter->netdev,
+ "Couldn't initialize crq. rc=%d\n", rc);
+ return rc;
+ }
+
+ rc = ibmvnic_reset_init(adapter, true);
+ if (rc)
+ return IBMVNIC_INIT_FAILED;
+
+ /* If the adapter was in PROBE state prior to the reset,
+ * exit here.
+ */
+ if (reset_state == VNIC_PROBED)
+ return 0;
+
+ rc = ibmvnic_login(netdev);
+ if (rc) {
+ adapter->state = reset_state;
+ return rc;
+ }
+
+ rc = init_resources(adapter);
+ if (rc)
+ return rc;
+
+ ibmvnic_disable_irqs(adapter);
+
+ adapter->state = VNIC_CLOSED;
+
+ if (reset_state == VNIC_CLOSED)
+ return 0;
+
+ rc = __ibmvnic_open(netdev);
+ if (rc)
+ return IBMVNIC_OPEN_FAILED;
+
+ /* refresh device's multicast list */
+ ibmvnic_set_multi(netdev);
+
+ /* kick napi */
+ for (i = 0; i < adapter->req_rx_queues; i++)
+ napi_schedule(&adapter->napi[i]);
+
+ return 0;
+}
+
/**
* do_reset returns zero if we are able to keep processing reset events, or
* non-zero if we hit a fatal error and must halt.
@@ -1841,12 +1921,10 @@ static int do_reset(struct ibmvnic_adapter *adapter,
netdev_dbg(adapter->netdev, "Re-setting driver (%d)\n",
rwi->reset_reason);
- adapter->reset_reason = rwi->reset_reason;
- /* requestor of VNIC_RESET_CHANGE_PARAM already has the rtnl lock */
- if (!(adapter->reset_reason == VNIC_RESET_CHANGE_PARAM))
- rtnl_lock();
+ rtnl_lock();
netif_carrier_off(netdev);
+ adapter->reset_reason = rwi->reset_reason;
old_num_rx_queues = adapter->req_rx_queues;
old_num_tx_queues = adapter->req_tx_queues;
@@ -1858,37 +1936,25 @@ static int do_reset(struct ibmvnic_adapter *adapter,
if (reset_state == VNIC_OPEN &&
adapter->reset_reason != VNIC_RESET_MOBILITY &&
adapter->reset_reason != VNIC_RESET_FAILOVER) {
- if (adapter->reset_reason == VNIC_RESET_CHANGE_PARAM) {
- rc = __ibmvnic_close(netdev);
- if (rc)
- goto out;
- } else {
- adapter->state = VNIC_CLOSING;
-
- /* Release the RTNL lock before link state change and
- * re-acquire after the link state change to allow
- * linkwatch_event to grab the RTNL lock and run during
- * a reset.
- */
- rtnl_unlock();
- rc = set_link_state(adapter, IBMVNIC_LOGICAL_LNK_DN);
- rtnl_lock();
- if (rc)
- goto out;
+ adapter->state = VNIC_CLOSING;
- if (adapter->state != VNIC_CLOSING) {
- rc = -1;
- goto out;
- }
+ /* Release the RTNL lock before link state change and
+ * re-acquire after the link state change to allow
+ * linkwatch_event to grab the RTNL lock and run during
+ * a reset.
+ */
+ rtnl_unlock();
+ rc = set_link_state(adapter, IBMVNIC_LOGICAL_LNK_DN);
+ rtnl_lock();
+ if (rc)
+ goto out;
- adapter->state = VNIC_CLOSED;
+ if (adapter->state != VNIC_CLOSING) {
+ rc = -1;
+ goto out;
}
- }
- if (adapter->reset_reason == VNIC_RESET_CHANGE_PARAM) {
- release_resources(adapter);
- release_sub_crqs(adapter, 1);
- release_crq_queue(adapter);
+ adapter->state = VNIC_CLOSED;
}
if (adapter->reset_reason != VNIC_RESET_NON_FATAL) {
@@ -1897,9 +1963,7 @@ static int do_reset(struct ibmvnic_adapter *adapter,
*/
adapter->state = VNIC_PROBED;
- if (adapter->reset_reason == VNIC_RESET_CHANGE_PARAM) {
- rc = init_crq_queue(adapter);
- } else if (adapter->reset_reason == VNIC_RESET_MOBILITY) {
+ if (adapter->reset_reason == VNIC_RESET_MOBILITY) {
rc = ibmvnic_reenable_crq_queue(adapter);
release_sub_crqs(adapter, 1);
} else {
@@ -1939,11 +2003,7 @@ static int do_reset(struct ibmvnic_adapter *adapter,
goto out;
}
- if (adapter->reset_reason == VNIC_RESET_CHANGE_PARAM) {
- rc = init_resources(adapter);
- if (rc)
- goto out;
- } else if (adapter->req_rx_queues != old_num_rx_queues ||
+ if (adapter->req_rx_queues != old_num_rx_queues ||
adapter->req_tx_queues != old_num_tx_queues ||
adapter->req_rx_add_entries_per_subcrq !=
old_num_rx_slots ||
@@ -2004,9 +2064,7 @@ static int do_reset(struct ibmvnic_adapter *adapter,
rc = 0;
out:
- /* requestor of VNIC_RESET_CHANGE_PARAM should still hold the rtnl lock */
- if (!(adapter->reset_reason == VNIC_RESET_CHANGE_PARAM))
- rtnl_unlock();
+ rtnl_unlock();
return rc;
}
@@ -2140,7 +2198,10 @@ static void __ibmvnic_reset(struct work_struct *work)
}
spin_unlock_irqrestore(&adapter->state_lock, flags);
- if (adapter->force_reset_recovery) {
+ if (rwi->reset_reason == VNIC_RESET_CHANGE_PARAM) {
+ /* CHANGE_PARAM requestor holds rtnl_lock */
+ rc = do_change_param_reset(adapter, rwi, reset_state);
+ } else if (adapter->force_reset_recovery) {
/* Transport event occurred during previous reset */
if (adapter->wait_for_reset) {
/* Previous was CHANGE_PARAM; caller locked */
--
2.18.2
^ permalink raw reply related
* Re: [PATCH 02/29] powerpc/rtas: prevent suspend-related sys_rtas use on LE
From: Nathan Lynch @ 2020-11-06 16:44 UTC (permalink / raw)
To: Andrew Donnellan, linuxppc-dev; +Cc: tyreld, brking, mmc, cforno12, drt
In-Reply-To: <95c8b599-f939-ad28-5671-cfbf7436508e@linux.ibm.com>
Andrew Donnellan <ajd@linux.ibm.com> writes:
> On 30/10/20 11:10 pm, Nathan Lynch wrote:
>>> And there's a zero chance that drmgr will ever be fixed on LE?
>>
>> It's always used the sysfs interface on LE, and the only way to provoke
>> it to attempt the syscalls is by doing something like this before
>> running the migration:
>>
>> # echo 0 > /tmp/fake_api_version
>> # mount -o bind,ro /tmp/fake_api_version /sys/kernel/mobility/api_version
>>
>> So I'm not aware of any circumstance that would actually motivate
>> someone to make it work on LE. I'd say it's more likely that drmgr will
>> drop its support for using the syscall altogether.
>>
>
> Okay. librtas should handle the error fine, so I don't have any huge
> objection to this, though perhaps a documentation patch to librtas to
> mention that these calls are BE-only would be in order.
Good suggestion, I've drafted a documentation change as well as an
attempt to mark the appropriate APIs deprecated for LE here:
https://github.com/nathanlynch/librtas/tree/topic/document-suspend-filter
which I'll send to Tyrel if/when the Linux change is staged.
^ permalink raw reply
* [RFC PATCH 9/9] powerpc/64s: use interrupt restart table to speed up return from interrupt
From: Nicholas Piggin @ 2020-11-06 15:59 UTC (permalink / raw)
To: linuxppc-dev; +Cc: Nicholas Piggin
In-Reply-To: <20201106155929.2246055-1-npiggin@gmail.com>
The restart table facility is used to return from interrupt without
disabling MSR[EE] or MSR[RI].
Interrupt return code is put into the low soft-masked region, and
critical code that has return SRRs set, soft-masked state set with no
soft-pending interrupts to replay, and no exit work, is put into
alternate return sections. r1 is saved in the paca. If an interrupt hits
at this point, our fixup location re-loads r1 and from there we can get
to regs, critical things are re-loaded, and we go around and do the
exit sequence again.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
---
arch/powerpc/include/asm/asm-prototypes.h | 4 +-
arch/powerpc/include/asm/paca.h | 1 +
arch/powerpc/include/asm/ptrace.h | 13 +-
arch/powerpc/kernel/asm-offsets.c | 3 +
arch/powerpc/kernel/interrupt_64.S | 119 ++++++++++-
arch/powerpc/kernel/syscall_64.c | 242 +++++++++++++---------
6 files changed, 277 insertions(+), 105 deletions(-)
diff --git a/arch/powerpc/include/asm/asm-prototypes.h b/arch/powerpc/include/asm/asm-prototypes.h
index 939f3c94c8f3..e0b0fc2913c1 100644
--- a/arch/powerpc/include/asm/asm-prototypes.h
+++ b/arch/powerpc/include/asm/asm-prototypes.h
@@ -71,8 +71,8 @@ void __init machine_init(u64 dt_ptr);
#endif
long system_call_exception(long r3, long r4, long r5, long r6, long r7, long r8, unsigned long r0, struct pt_regs *regs);
notrace unsigned long syscall_exit_prepare(unsigned long r3, struct pt_regs *regs, long scv);
-notrace unsigned long interrupt_exit_user_prepare(struct pt_regs *regs, unsigned long msr);
-notrace unsigned long interrupt_exit_kernel_prepare(struct pt_regs *regs, unsigned long msr);
+notrace unsigned long interrupt_exit_user_prepare(struct pt_regs *regs);
+notrace unsigned long interrupt_exit_kernel_prepare(struct pt_regs *regs);
long ppc_fadvise64_64(int fd, int advice, u32 offset_high, u32 offset_low,
u32 len_high, u32 len_low);
diff --git a/arch/powerpc/include/asm/paca.h b/arch/powerpc/include/asm/paca.h
index 58e9995c3184..ab123dc85b81 100644
--- a/arch/powerpc/include/asm/paca.h
+++ b/arch/powerpc/include/asm/paca.h
@@ -167,6 +167,7 @@ struct paca_struct {
u64 kstack; /* Saved Kernel stack addr */
u64 saved_r1; /* r1 save for RTAS calls or PM or EE=0 */
u64 saved_msr; /* MSR saved here by enter_rtas */
+ u64 exit_save_r1; /* Syscall/interrupt R1 save */
#ifdef CONFIG_PPC_BOOK3E
u16 trap_save; /* Used when bad stack is encountered */
#endif
diff --git a/arch/powerpc/include/asm/ptrace.h b/arch/powerpc/include/asm/ptrace.h
index 2c3e773ce292..cd49769d4194 100644
--- a/arch/powerpc/include/asm/ptrace.h
+++ b/arch/powerpc/include/asm/ptrace.h
@@ -50,14 +50,23 @@ struct pt_regs
union {
struct {
-#ifdef CONFIG_PPC64
+#ifdef CONFIG_PPC_BOOK3S_64
unsigned long ppr;
+ unsigned long exit_result;
#endif
#ifdef CONFIG_PPC_KUAP
unsigned long kuap;
#endif
};
- unsigned long __pad[2]; /* Maintain 16 byte interrupt stack alignment */
+
+ /* Maintain 16 byte interrupt stack alignment */
+#ifdef CONFIG_PPC_KUAP
+#ifdef CONFIG_PPC_BOOK3S_64
+ unsigned long __pad[4];
+#else
+ unsigned long __pad[2];
+#endif
+#endif
};
};
#endif
diff --git a/arch/powerpc/kernel/asm-offsets.c b/arch/powerpc/kernel/asm-offsets.c
index ea13e35dd511..eec4e92bd938 100644
--- a/arch/powerpc/kernel/asm-offsets.c
+++ b/arch/powerpc/kernel/asm-offsets.c
@@ -290,6 +290,7 @@ int main(void)
OFFSET(ACCOUNT_STARTTIME_USER, paca_struct, accounting.starttime_user);
OFFSET(ACCOUNT_USER_TIME, paca_struct, accounting.utime);
OFFSET(ACCOUNT_SYSTEM_TIME, paca_struct, accounting.stime);
+ OFFSET(PACA_EXIT_SAVE_R1, paca_struct, exit_save_r1);
#ifdef CONFIG_PPC_BOOK3E
OFFSET(PACA_TRAP_SAVE, paca_struct, trap_save);
#endif
@@ -353,7 +354,9 @@ int main(void)
STACK_PT_REGS_OFFSET(_ESR, dsisr);
#else /* CONFIG_PPC64 */
STACK_PT_REGS_OFFSET(SOFTE, softe);
+#ifdef CONFIG_PPC_BOOK3S_64
STACK_PT_REGS_OFFSET(_PPR, ppr);
+#endif
#endif /* CONFIG_PPC64 */
#ifdef CONFIG_PPC_KUAP
diff --git a/arch/powerpc/kernel/interrupt_64.S b/arch/powerpc/kernel/interrupt_64.S
index 9b44f6d3463b..a686d625b8ee 100644
--- a/arch/powerpc/kernel/interrupt_64.S
+++ b/arch/powerpc/kernel/interrupt_64.S
@@ -113,9 +113,18 @@ END_FTR_SECTION_IFSET(CPU_FTR_HAS_PPR)
bl system_call_exception
.Lsyscall_vectored_\name\()_exit:
- addi r4,r1,STACK_FRAME_OVERHEAD
+ addi r4,r1,STACK_FRAME_OVERHEAD
li r5,1 /* scv */
bl syscall_exit_prepare
+ std r1,PACA_EXIT_SAVE_R1(r13) /* save r1 for restart */
+.Lsyscall_vectored_\name\()_rst_start:
+ lbz r11,PACAIRQHAPPENED(r13)
+ andi. r11,r11,(~PACA_IRQ_HARD_DIS)@l
+ bne- .Lsyscall_vectored_\name\()_restart
+ li r11,IRQS_ENABLED
+ stb r11,PACAIRQSOFTMASK(r13)
+ li r11,0
+ stb r11,PACAIRQHAPPENED(r13) # clear out possible HARD_DIS
ld r2,_CCR(r1)
ld r4,_NIP(r1)
@@ -165,8 +174,6 @@ END_FTR_SECTION_IFSET(CPU_FTR_HAS_PPR)
b . /* prevent speculative execution */
.Lsyscall_vectored_\name\()_restore_regs:
- li r3,0
- mtmsrd r3,1
mtspr SPRN_SRR0,r4
mtspr SPRN_SRR1,r5
@@ -184,9 +191,26 @@ END_FTR_SECTION_IFSET(CPU_FTR_HAS_PPR)
REST_2GPRS(12, r1)
ld r1,GPR1(r1)
RFI_TO_USER
+.Lsyscall_vectored_\name\()_rst_end:
+
+.Lsyscall_vectored_\name\()_restart:
+ GET_PACA(r13)
+ ld r1,PACA_EXIT_SAVE_R1(r13)
+ ld r2,PACATOC(r13)
+ ld r3,RESULT(r1)
+ addi r4,r1,STACK_FRAME_OVERHEAD
+ li r11,IRQS_ALL_DISABLED
+ stb r11,PACAIRQSOFTMASK(r13)
+ bl syscall_exit_restart
+ std r1,PACA_EXIT_SAVE_R1(r13) /* save r1 for restart */
+ b .Lsyscall_vectored_\name\()_rst_start
+
+RESTART_TABLE(.Lsyscall_vectored_\name\()_rst_start, .Lsyscall_vectored_\name\()_rst_end, .Lsyscall_vectored_\name\()_restart)
+
.endm
system_call_vectored common 0x3000
+
/*
* We instantiate another entry copy for the SIGILL variant, with TRAP=0x7ff0
* which is tested by system_call_exception when r0 is -1 (as set by vector
@@ -289,9 +313,18 @@ END_BTB_FLUSH_SECTION
bl system_call_exception
.Lsyscall_exit:
- addi r4,r1,STACK_FRAME_OVERHEAD
+ addi r4,r1,STACK_FRAME_OVERHEAD
li r5,0 /* !scv */
bl syscall_exit_prepare
+ std r1,PACA_EXIT_SAVE_R1(r13) /* save r1 for restart */
+.Lsyscall_rst_start:
+ lbz r11,PACAIRQHAPPENED(r13)
+ andi. r11,r11,(~PACA_IRQ_HARD_DIS)@l
+ bne- .Lsyscall_restart
+ li r11,IRQS_ENABLED
+ stb r11,PACAIRQSOFTMASK(r13)
+ li r11,0
+ stb r11,PACAIRQHAPPENED(r13) # clear out possible HARD_DIS
ld r2,_CCR(r1)
ld r6,_LINK(r1)
@@ -356,6 +389,21 @@ END_FTR_SECTION_IFSET(CPU_FTR_HAS_PPR)
REST_8GPRS(4, r1)
ld r12,GPR12(r1)
b .Lsyscall_restore_regs_cont
+.Lsyscall_rst_end:
+
+.Lsyscall_restart:
+ GET_PACA(r13)
+ ld r1,PACA_EXIT_SAVE_R1(r13)
+ ld r2,PACATOC(r13)
+ ld r3,RESULT(r1)
+ addi r4,r1,STACK_FRAME_OVERHEAD
+ li r11,IRQS_ALL_DISABLED
+ stb r11,PACAIRQSOFTMASK(r13)
+ bl syscall_exit_restart
+ std r1,PACA_EXIT_SAVE_R1(r13) /* save r1 for restart */
+ b .Lsyscall_rst_start
+
+RESTART_TABLE(.Lsyscall_rst_start, .Lsyscall_rst_end, .Lsyscall_restart)
#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
.Ltabort_syscall:
@@ -439,16 +487,32 @@ _ASM_NOKPROBE_SYMBOL(interrupt_return_\srr\())
ld r4,_MSR(r1)
andi. r0,r4,MSR_PR
beq .Lkernel_interrupt_return_\srr
+.Linterrupt_return_\srr\()_user:
+ li r11,IRQS_ALL_DISABLED
+ stb r11,PACAIRQSOFTMASK(r13)
addi r3,r1,STACK_FRAME_OVERHEAD
bl interrupt_exit_user_prepare
cmpdi r3,0
bne- .Lrestore_nvgprs_\srr
+.Lrestore_nvgprs_\srr\()_cont:
+
+ std r1,PACA_EXIT_SAVE_R1(r13) /* save r1 for restart */
+.Linterrupt_return_\srr\()_user_rst_start:
+ lbz r11,PACAIRQHAPPENED(r13)
+ andi. r11,r11,(~PACA_IRQ_HARD_DIS)@l
+ bne- .Linterrupt_return_\srr\()_user_restart
+ li r11,IRQS_ENABLED
+ stb r11,PACAIRQSOFTMASK(r13)
+ li r11,0
+ stb r11,PACAIRQHAPPENED(r13) # clear out possible HARD_DIS
.Lfast_user_interrupt_return_\srr:
BEGIN_FTR_SECTION
ld r10,_PPR(r1)
mtspr SPRN_PPR,r10
END_FTR_SECTION_IFSET(CPU_FTR_HAS_PPR)
+ lbz r4,PACAIRQSOFTMASK(r13)
+ tdnei r4,IRQS_ENABLED
.ifc \srr,srr
lbz r4,PACASRR_VALID(r13)
.else
@@ -503,16 +567,46 @@ ALT_FTR_SECTION_END_IFCLR(CPU_FTR_STCX_CHECKS_ADDRESS)
HRFI_TO_USER
.endif
b . /* prevent speculative execution */
+.Linterrupt_return_\srr\()_user_rst_end:
.Lrestore_nvgprs_\srr\():
REST_NVGPRS(r1)
- b .Lfast_user_interrupt_return_\srr
+ b .Lrestore_nvgprs_\srr\()_cont
+
+.Linterrupt_return_\srr\()_user_restart:
+ GET_PACA(r13)
+ ld r1,PACA_EXIT_SAVE_R1(r13)
+ ld r2,PACATOC(r13)
+ addi r3,r1,STACK_FRAME_OVERHEAD
+ li r11,IRQS_ALL_DISABLED
+ stb r11,PACAIRQSOFTMASK(r13)
+ bl interrupt_exit_user_restart
+ std r1,PACA_EXIT_SAVE_R1(r13) /* save r1 for restart */
+ b .Linterrupt_return_\srr\()_user_rst_start
+
+RESTART_TABLE(.Linterrupt_return_\srr\()_user_rst_start, .Linterrupt_return_\srr\()_user_rst_end, .Linterrupt_return_\srr\()_user_restart)
.balign IFETCH_ALIGN_BYTES
.Lkernel_interrupt_return_\srr\():
+.Linterrupt_return_\srr\()_kernel:
+ li r11,IRQS_ALL_DISABLED
+ stb r11,PACAIRQSOFTMASK(r13)
addi r3,r1,STACK_FRAME_OVERHEAD
bl interrupt_exit_kernel_prepare
+ std r1,PACA_EXIT_SAVE_R1(r13) /* save r1 for restart */
+.Linterrupt_return_\srr\()_kernel_rst_start:
+ lbz r11,SOFTE(r1)
+ cmpwi r11,IRQS_ENABLED
+ stb r11,PACAIRQSOFTMASK(r13)
+ bne 1f
+ lbz r11,PACAIRQHAPPENED(r13)
+ andi. r11,r11,(~PACA_IRQ_HARD_DIS)@l
+ bne- .Linterrupt_return_\srr\()_kernel_restart
+ li r11,0
+ stb r11,PACAIRQHAPPENED(r13) # clear out possible HARD_DIS
+1:
+
.Lfast_kernel_interrupt_return_\srr\():
cmpdi cr1,r3,0
.ifc \srr,srr
@@ -600,6 +694,21 @@ ALT_FTR_SECTION_END_IFCLR(CPU_FTR_STCX_CHECKS_ADDRESS)
HRFI_TO_KERNEL
.endif
b . /* prevent speculative execution */
+.Linterrupt_return_\srr\()_kernel_rst_end:
+
+.Linterrupt_return_\srr\()_kernel_restart:
+ GET_PACA(r13)
+ ld r1,PACA_EXIT_SAVE_R1(r13)
+ ld r2,PACATOC(r13)
+ addi r3,r1,STACK_FRAME_OVERHEAD
+ li r11,IRQS_ALL_DISABLED
+ stb r11,PACAIRQSOFTMASK(r13)
+ bl interrupt_exit_kernel_restart
+ std r1,PACA_EXIT_SAVE_R1(r13) /* save r1 for restart */
+ b .Linterrupt_return_\srr\()_kernel_rst_start
+
+RESTART_TABLE(.Linterrupt_return_\srr\()_kernel_rst_start, .Linterrupt_return_\srr\()_kernel_rst_end, .Linterrupt_return_\srr\()_kernel_restart)
+
.endm
interrupt_return_macro srr
diff --git a/arch/powerpc/kernel/syscall_64.c b/arch/powerpc/kernel/syscall_64.c
index 672f2a796487..5add073a21b7 100644
--- a/arch/powerpc/kernel/syscall_64.c
+++ b/arch/powerpc/kernel/syscall_64.c
@@ -109,87 +109,27 @@ notrace long system_call_exception(long r3, long r4, long r5,
return f(r3, r4, r5, r6, r7, r8);
}
-/*
- * local irqs must be disabled. Returns false if the caller must re-enable
- * them, check for new work, and try again.
- */
-static notrace inline bool prep_irq_for_enabled_exit(bool clear_ri)
+static notrace inline bool prep_irq_for_enabled_exit(void)
{
/* This must be done with RI=1 because tracing may touch vmaps */
trace_hardirqs_on();
- /* This pattern matches prep_irq_for_idle */
- if (clear_ri)
- __hard_EE_RI_disable();
- else
- __hard_irq_disable();
if (unlikely(lazy_irq_pending_nocheck())) {
- /* Took an interrupt, may have more exit work to do. */
- if (clear_ri)
- __hard_RI_enable();
trace_hardirqs_off();
- local_paca->irq_happened |= PACA_IRQ_HARD_DIS;
-
return false;
}
- local_paca->irq_happened = 0;
- irq_soft_mask_set(IRQS_ENABLED);
return true;
}
-/*
- * This should be called after a syscall returns, with r3 the return value
- * from the syscall. If this function returns non-zero, the system call
- * exit assembly should additionally load all GPR registers and CTR and XER
- * from the interrupt frame.
- *
- * The function graph tracer can not trace the return side of this function,
- * because RI=0 and soft mask state is "unreconciled", so it is marked notrace.
- */
-notrace unsigned long syscall_exit_prepare(unsigned long r3,
- struct pt_regs *regs,
- long scv)
+notrace unsigned long syscall_exit_prepare_main(unsigned long r3,
+ struct pt_regs *regs)
{
unsigned long *ti_flagsp = ¤t_thread_info()->flags;
unsigned long ti_flags;
unsigned long ret = 0;
- CT_WARN_ON(ct_state() == CONTEXT_USER);
-
- kuap_check_amr();
-
- regs->result = r3;
-
- /* Check whether the syscall is issued inside a restartable sequence */
- rseq_syscall(regs);
-
- ti_flags = *ti_flagsp;
-
- if (unlikely(r3 >= (unsigned long)-MAX_ERRNO) && !scv) {
- if (likely(!(ti_flags & (_TIF_NOERROR | _TIF_RESTOREALL)))) {
- r3 = -r3;
- regs->ccr |= 0x10000000; /* Set SO bit in CR */
- }
- }
-
- if (unlikely(ti_flags & _TIF_PERSYSCALL_MASK)) {
- if (ti_flags & _TIF_RESTOREALL)
- ret = _TIF_RESTOREALL;
- else
- regs->gpr[3] = r3;
- clear_bits(_TIF_PERSYSCALL_MASK, ti_flagsp);
- } else {
- regs->gpr[3] = r3;
- }
-
- if (unlikely(ti_flags & _TIF_SYSCALL_DOTRACE)) {
- do_syscall_trace_leave(regs);
- ret |= _TIF_RESTOREALL;
- }
-
again:
- local_irq_disable();
ti_flags = READ_ONCE(*ti_flagsp);
while (unlikely(ti_flags & (_TIF_USER_WORK_MASK & ~_TIF_RESTORE_TM))) {
local_irq_enable();
@@ -233,15 +173,16 @@ notrace unsigned long syscall_exit_prepare(unsigned long r3,
}
}
- user_enter_irqoff();
-
- /* scv need not set RI=0 because SRRs are not used */
- if (unlikely(!prep_irq_for_enabled_exit(!scv))) {
- user_exit_irqoff();
+ if (unlikely(lazy_irq_pending_nocheck())) {
local_irq_enable();
+ local_irq_disable();
goto again;
}
+ trace_hardirqs_on();
+
+ user_enter_irqoff();
+
#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
local_paca->tm_scratch = regs->msr;
#endif
@@ -251,17 +192,95 @@ notrace unsigned long syscall_exit_prepare(unsigned long r3,
return ret;
}
+/*
+ * This should be called after a syscall returns, with r3 the return value
+ * from the syscall. If this function returns non-zero, the system call
+ * exit assembly should additionally load all GPR registers and CTR and XER
+ * from the interrupt frame.
+ *
+ * The function graph tracer can not trace the return side of this function,
+ * because RI=0 and soft mask state is "unreconciled", so it is marked notrace.
+ */
+notrace unsigned long syscall_exit_prepare(unsigned long r3,
+ struct pt_regs *regs,
+ long scv)
+{
+ unsigned long *ti_flagsp = ¤t_thread_info()->flags;
+ unsigned long ti_flags;
+ unsigned long ret = 0;
+
+ CT_WARN_ON(ct_state() == CONTEXT_USER);
+
+ kuap_check_amr();
+
+ regs->result = r3;
+
+ /* Check whether the syscall is issued inside a restartable sequence */
+ rseq_syscall(regs);
+
+ ti_flags = *ti_flagsp;
+
+ if (unlikely(r3 >= (unsigned long)-MAX_ERRNO) && !scv) {
+ if (likely(!(ti_flags & (_TIF_NOERROR | _TIF_RESTOREALL)))) {
+ r3 = -r3;
+ regs->ccr |= 0x10000000; /* Set SO bit in CR */
+ }
+ }
+
+ if (unlikely(ti_flags & _TIF_PERSYSCALL_MASK)) {
+ if (ti_flags & _TIF_RESTOREALL)
+ ret = _TIF_RESTOREALL;
+ else
+ regs->gpr[3] = r3;
+ clear_bits(_TIF_PERSYSCALL_MASK, ti_flagsp);
+ } else {
+ regs->gpr[3] = r3;
+ }
+
+ if (unlikely(ti_flags & _TIF_SYSCALL_DOTRACE)) {
+ do_syscall_trace_leave(regs);
+ ret |= _TIF_RESTOREALL;
+ }
+
+ local_irq_disable();
+ ret |= syscall_exit_prepare_main(r3, regs);
+
+ regs->exit_result = ret;
+
+ return ret;
+}
+
+notrace unsigned long syscall_exit_restart(unsigned long r3, struct pt_regs *regs)
+{
+ /* This is called in when detecting a soft-pending interrupt as well,
+ * so can't just have restart table returns clear SRR1[MSR] and set
+ * PACA_IRQ_HARD_DIS here (unless the soft-pending case were to clear
+ * MSR[EE] too).
+ */
+ hard_irq_disable();
+
+ trace_hardirqs_off();
+ user_exit_irqoff();
+ account_cpu_user_entry();
+
+ BUG_ON(!user_mode(regs));
+
+ regs->exit_result |= syscall_exit_prepare_main(r3, regs);
+
+ return regs->exit_result;
+}
+
#ifdef CONFIG_PPC_BOOK3S /* BOOK3E not yet using this */
-notrace unsigned long interrupt_exit_user_prepare(struct pt_regs *regs, unsigned long msr)
+notrace unsigned long interrupt_exit_user_prepare(struct pt_regs *regs)
{
#ifdef CONFIG_PPC_BOOK3E
struct thread_struct *ts = ¤t->thread;
#endif
unsigned long *ti_flagsp = ¤t_thread_info()->flags;
unsigned long ti_flags;
- unsigned long flags;
unsigned long ret = 0;
+ BUG_ON(!irqs_disabled());
if (IS_ENABLED(CONFIG_PPC_BOOK3S))
BUG_ON(!(regs->msr & MSR_RI));
BUG_ON(!(regs->msr & MSR_PR));
@@ -275,8 +294,6 @@ notrace unsigned long interrupt_exit_user_prepare(struct pt_regs *regs, unsigned
*/
kuap_check_amr();
- local_irq_save(flags);
-
again:
ti_flags = READ_ONCE(*ti_flagsp);
while (unlikely(ti_flags & (_TIF_USER_WORK_MASK & ~_TIF_RESTORE_TM))) {
@@ -310,14 +327,16 @@ notrace unsigned long interrupt_exit_user_prepare(struct pt_regs *regs, unsigned
}
}
- user_enter_irqoff();
- if (unlikely(!prep_irq_for_enabled_exit(true))) {
- user_exit_irqoff();
+ if (unlikely(lazy_irq_pending_nocheck())) {
local_irq_enable();
local_irq_disable();
goto again;
}
+ trace_hardirqs_on();
+
+ user_enter_irqoff();
+
#ifdef CONFIG_PPC_BOOK3E
if (unlikely(ts->debug.dbcr0 & DBCR0_IDM)) {
/*
@@ -336,19 +355,21 @@ notrace unsigned long interrupt_exit_user_prepare(struct pt_regs *regs, unsigned
account_cpu_user_exit();
+ regs->exit_result = ret;
+
return ret;
}
void unrecoverable_exception(struct pt_regs *regs);
void preempt_schedule_irq(void);
-notrace unsigned long interrupt_exit_kernel_prepare(struct pt_regs *regs, unsigned long msr)
+notrace unsigned long interrupt_exit_kernel_prepare(struct pt_regs *regs)
{
unsigned long *ti_flagsp = ¤t_thread_info()->flags;
- unsigned long flags;
unsigned long ret = 0;
unsigned long amr;
+ BUG_ON(!irqs_disabled());
if (IS_ENABLED(CONFIG_PPC_BOOK3S) && unlikely(!(regs->msr & MSR_RI)))
unrecoverable_exception(regs);
BUG_ON(regs->msr & MSR_PR);
@@ -362,13 +383,6 @@ notrace unsigned long interrupt_exit_kernel_prepare(struct pt_regs *regs, unsign
amr = kuap_get_and_check_amr();
- if (unlikely(*ti_flagsp & _TIF_EMULATE_STACK_STORE)) {
- clear_bits(_TIF_EMULATE_STACK_STORE, ti_flagsp);
- ret = 1;
- }
-
- local_irq_save(flags);
-
if (regs->softe == IRQS_ENABLED) {
/* Returning to a kernel context with local irqs enabled. */
WARN_ON_ONCE(!(regs->msr & MSR_EE));
@@ -381,27 +395,33 @@ notrace unsigned long interrupt_exit_kernel_prepare(struct pt_regs *regs, unsign
}
}
- if (unlikely(!prep_irq_for_enabled_exit(true))) {
- /*
- * Can't local_irq_restore to replay if we were in
- * interrupt context. Must replay directly.
- */
- if (irqs_disabled_flags(flags)) {
- replay_soft_interrupts();
- } else {
- local_irq_restore(flags);
- local_irq_save(flags);
- }
+ if (unlikely(lazy_irq_pending_nocheck())) {
+ hard_irq_disable();
+ replay_soft_interrupts();
/* Took an interrupt, may have more exit work to do. */
goto again;
}
+ local_paca->irq_happened &= ~PACA_IRQ_HARD_DIS;
+
+ trace_hardirqs_on();
} else {
/* Returning to a kernel context with local irqs disabled. */
- __hard_EE_RI_disable();
if (regs->msr & MSR_EE)
local_paca->irq_happened &= ~PACA_IRQ_HARD_DIS;
}
+ if (unlikely(*ti_flagsp & _TIF_EMULATE_STACK_STORE)) {
+ /* Stack store can't be restarted (stack might have been clobbered) */
+ __hard_EE_RI_disable();
+ if (unlikely(lazy_irq_pending_nocheck()) && regs->softe == IRQS_ENABLED) {
+ local_paca->irq_happened |= PACA_IRQ_HARD_DIS;
+ __hard_RI_enable();
+ goto again;
+ }
+
+ clear_bits(_TIF_EMULATE_STACK_STORE, ti_flagsp);
+ ret = 1;
+ }
#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
local_paca->tm_scratch = regs->msr;
@@ -416,4 +436,34 @@ notrace unsigned long interrupt_exit_kernel_prepare(struct pt_regs *regs, unsign
return ret;
}
+
+notrace unsigned long interrupt_exit_user_restart(struct pt_regs *regs)
+{
+ hard_irq_disable();
+
+ trace_hardirqs_off();
+ user_exit_irqoff();
+ account_cpu_user_entry();
+
+ BUG_ON(!user_mode(regs));
+
+ regs->exit_result |= interrupt_exit_user_prepare(regs);
+
+ return regs->exit_result;
+}
+
+notrace unsigned long interrupt_exit_kernel_restart(struct pt_regs *regs)
+{
+ hard_irq_disable();
+
+ set_kuap(AMR_KUAP_BLOCKED);
+
+ if (regs->softe == IRQS_ENABLED)
+ trace_hardirqs_off();
+
+ BUG_ON(user_mode(regs));
+
+ return interrupt_exit_kernel_prepare(regs);
+}
+
#endif
--
2.23.0
^ permalink raw reply related
* [RFC PATCH 8/9] powerpc/64s: interrupt soft-enable race fix
From: Nicholas Piggin @ 2020-11-06 15:59 UTC (permalink / raw)
To: linuxppc-dev; +Cc: Nicholas Piggin
In-Reply-To: <20201106155929.2246055-1-npiggin@gmail.com>
Prevent interrupt restore from allowing racing hard interrupts going
ahead of previous soft-pending ones, by using the soft-masked restart
handler to allow a store to clear the soft-mask while knowing nothing
is soft-pending.
This probably doesn't matter much in practice, but it's a simple
demonstrator / test case to exercise the restart table logic.
XXX: 64e can't do this unless it adds restart table support
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
---
arch/powerpc/kernel/irq.c | 79 +++++++++++++++++++++++++--------------
1 file changed, 50 insertions(+), 29 deletions(-)
diff --git a/arch/powerpc/kernel/irq.c b/arch/powerpc/kernel/irq.c
index c8185f709d26..9671468b2c51 100644
--- a/arch/powerpc/kernel/irq.c
+++ b/arch/powerpc/kernel/irq.c
@@ -317,52 +317,73 @@ notrace void arch_local_irq_restore(unsigned long mask)
unsigned char irq_happened;
/* Write the new soft-enabled value */
- irq_soft_mask_set(mask);
- if (mask)
+ if (mask) {
+ irq_soft_mask_set(mask);
return;
+ }
/*
- * From this point onward, we can take interrupts, preempt,
- * etc... unless we got hard-disabled. We check if an event
- * happened. If none happened, we know we can just return.
- *
- * We may have preempted before the check below, in which case
- * we are checking the "new" CPU instead of the old one. This
- * is only a problem if an event happened on the "old" CPU.
+ * After the stb, interrupts are unmasked and there are no interrupts
+ * pending replay. The restart sequence makes this atomic with
+ * respect to soft-masked interrupts. If this was just a simple code
+ * sequence, a soft-masked interrupt could become pending right after
+ * the comparison and before the stb.
*
- * External interrupt events will have caused interrupts to
- * be hard-disabled, so there is no problem, we
- * cannot have preempted.
+ * This allows interrupts to be unmasked without hard disabling, and
+ * also without new hard interrupts coming in ahead of pending ones.
*/
+ asm_volatile_goto(
+"1: \n"
+" lbz 9,%0(13) \n"
+" cmpwi 9,0 \n"
+" bne %l[happened] \n"
+" stb 9,%1(13) \n"
+"2: \n"
+ RESTART_TABLE(1b, 2b, 1b)
+ : : "i" (offsetof(struct paca_struct, irq_happened)),
+ "i" (offsetof(struct paca_struct, irq_soft_mask))
+ : "cr0", "r9"
+ : happened);
+
+ if (IS_ENABLED(CONFIG_PPC_IRQ_SOFT_MASK_DEBUG))
+ WARN_ON_ONCE(!(mfmsr() & MSR_EE));
+
+ return;
+
+happened:
irq_happened = get_irq_happened();
- if (!irq_happened) {
+ if (IS_ENABLED(CONFIG_PPC_IRQ_SOFT_MASK_DEBUG))
+ WARN_ON_ONCE(!irq_happened);
+
+ if (irq_happened == PACA_IRQ_HARD_DIS) {
if (IS_ENABLED(CONFIG_PPC_IRQ_SOFT_MASK_DEBUG))
- WARN_ON_ONCE(!(mfmsr() & MSR_EE));
+ WARN_ON_ONCE(mfmsr() & MSR_EE);
+ irq_soft_mask_set(IRQS_ENABLED);
+ local_paca->irq_happened = 0;
+ __hard_irq_enable();
return;
}
- /* We need to hard disable to replay. */
+ /* Have interrupts to replay, need to hard disable first */
if (!(irq_happened & PACA_IRQ_HARD_DIS)) {
- if (IS_ENABLED(CONFIG_PPC_IRQ_SOFT_MASK_DEBUG))
- WARN_ON_ONCE(!(mfmsr() & MSR_EE));
+ if (IS_ENABLED(CONFIG_PPC_IRQ_SOFT_MASK_DEBUG)) {
+ if (!(mfmsr() & MSR_EE)) {
+ /*
+ * An interrupt could have come in and cleared
+ * MSR[EE] and set IRQ_HARD_DIS, so check
+ * IRQ_HARD_DIS again and warn if it is still
+ * clear.
+ */
+ irq_happened = get_irq_happened();
+ WARN_ON_ONCE(!(irq_happened & PACA_IRQ_HARD_DIS));
+ }
+ }
__hard_irq_disable();
} else {
- /*
- * We should already be hard disabled here. We had bugs
- * where that wasn't the case so let's dbl check it and
- * warn if we are wrong. Only do that when IRQ tracing
- * is enabled as mfmsr() can be costly.
- */
if (IS_ENABLED(CONFIG_PPC_IRQ_SOFT_MASK_DEBUG)) {
if (WARN_ON_ONCE(mfmsr() & MSR_EE))
__hard_irq_disable();
}
-
- if (irq_happened == PACA_IRQ_HARD_DIS) {
- local_paca->irq_happened = 0;
- __hard_irq_enable();
- return;
- }
}
/*
--
2.23.0
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