From: Nicholas Piggin <npiggin@gmail.com>
To: linuxppc-dev@lists.ozlabs.org
Cc: Nicholas Piggin <npiggin@gmail.com>
Subject: [RFC PATCH 0/9] powerpc/64s: fast interrupt exit
Date: Sat, 7 Nov 2020 01:59:20 +1000 [thread overview]
Message-ID: <20201106155929.2246055-1-npiggin@gmail.com> (raw)
This series attempts to improve the speed of interrupts and system calls
in two major ways.
Firstly, the SRR/HSRR registers do not need to be reloaded if they were
not used or clobbered fur the duration of the interrupt.
Secondly, an alternate return location facility is added for soft-masked
asynchronous interrupts and then that's used to set everything up for
return without having to disable MSR RI or EE.
After this series, the entire system call / interrupt handler fast path
executes no mtsprs and one mtmsrd to enable interrupts initially, and
the system call vectored path doesn't even need to do that.
Thanks,
Nick
Nicholas Piggin (9):
powerpc/64s: syscall real mode entry use mtmsrd rather than rfid
powerpc/64s: system call avoid setting MSR[RI] until we set MSR[EE]
powerpc/64s: introduce different functions to return from SRR vs HSRR
interrupts
powerpc/64s: avoid reloading (H)SRR registers if they are still valid
powerpc/64: move interrupt return asm to interrupt_64.S
powerpc/64s: save one more register in the masked interrupt handler
powerpc/64s: allow alternate return locations for soft-masked
interrupts
powerpc/64s: interrupt soft-enable race fix
powerpc/64s: use interrupt restart table to speed up return from
interrupt
arch/powerpc/Kconfig.debug | 5 +
arch/powerpc/include/asm/asm-prototypes.h | 4 +-
arch/powerpc/include/asm/head-64.h | 2 +-
arch/powerpc/include/asm/interrupt.h | 18 +
arch/powerpc/include/asm/paca.h | 3 +
arch/powerpc/include/asm/ppc_asm.h | 8 +
arch/powerpc/include/asm/ptrace.h | 28 +-
arch/powerpc/kernel/asm-offsets.c | 5 +
arch/powerpc/kernel/entry_64.S | 508 ---------------
arch/powerpc/kernel/exceptions-64s.S | 180 ++++--
arch/powerpc/kernel/fpu.S | 2 +
arch/powerpc/kernel/head_64.S | 5 +-
arch/powerpc/kernel/interrupt_64.S | 720 +++++++++++++++++++++
arch/powerpc/kernel/irq.c | 79 ++-
arch/powerpc/kernel/kgdb.c | 2 +-
arch/powerpc/kernel/kprobes-ftrace.c | 2 +-
arch/powerpc/kernel/kprobes.c | 10 +-
arch/powerpc/kernel/process.c | 21 +-
arch/powerpc/kernel/rtas.c | 13 +-
arch/powerpc/kernel/signal.c | 2 +-
arch/powerpc/kernel/signal_64.c | 14 +
arch/powerpc/kernel/syscall_64.c | 242 ++++---
arch/powerpc/kernel/syscalls.c | 2 +
arch/powerpc/kernel/traps.c | 18 +-
arch/powerpc/kernel/vector.S | 6 +-
arch/powerpc/kernel/vmlinux.lds.S | 10 +
arch/powerpc/lib/Makefile | 2 +-
arch/powerpc/lib/restart_table.c | 26 +
arch/powerpc/lib/sstep.c | 5 +-
arch/powerpc/math-emu/math.c | 2 +-
arch/powerpc/mm/fault.c | 2 +-
arch/powerpc/perf/core-book3s.c | 19 +-
arch/powerpc/platforms/powernv/opal-call.c | 3 +
arch/powerpc/sysdev/fsl_pci.c | 2 +-
34 files changed, 1244 insertions(+), 726 deletions(-)
create mode 100644 arch/powerpc/kernel/interrupt_64.S
create mode 100644 arch/powerpc/lib/restart_table.c
--
2.23.0
next reply other threads:[~2020-11-06 16:01 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-06 15:59 Nicholas Piggin [this message]
2020-11-06 15:59 ` [RFC PATCH 1/9] powerpc/64s: syscall real mode entry use mtmsrd rather than rfid Nicholas Piggin
2020-11-06 15:59 ` [RFC PATCH 2/9] powerpc/64s: system call avoid setting MSR[RI] until we set MSR[EE] Nicholas Piggin
2020-11-06 15:59 ` [RFC PATCH 3/9] powerpc/64s: introduce different functions to return from SRR vs HSRR interrupts Nicholas Piggin
2020-11-06 15:59 ` [RFC PATCH 4/9] powerpc/64s: avoid reloading (H)SRR registers if they are still valid Nicholas Piggin
2020-11-06 15:59 ` [RFC PATCH 5/9] powerpc/64: move interrupt return asm to interrupt_64.S Nicholas Piggin
2020-11-06 15:59 ` [RFC PATCH 6/9] powerpc/64s: save one more register in the masked interrupt handler Nicholas Piggin
2020-11-06 15:59 ` [RFC PATCH 7/9] powerpc/64s: allow alternate return locations for soft-masked interrupts Nicholas Piggin
2020-11-06 15:59 ` [RFC PATCH 8/9] powerpc/64s: interrupt soft-enable race fix Nicholas Piggin
2020-11-06 15:59 ` [RFC PATCH 9/9] powerpc/64s: use interrupt restart table to speed up return from interrupt Nicholas Piggin
2020-11-07 10:35 ` [RFC PATCH 0/9] powerpc/64s: fast interrupt exit Christophe Leroy
2020-11-10 8:49 ` Nicholas Piggin
2020-11-10 11:31 ` Christophe Leroy
2020-11-11 4:49 ` Nicholas Piggin
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