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| author |   Nicholas Piggin <npiggin@gmail.com> | 2019-07-11 12:24:03 +1000 |
|---|---|---|
| committer |   Michael Ellerman <mpe@ellerman.id.au> | 2020-01-16 14:59:37 +1000 |
| commit | ed0bc98f8cbe4f8254759d333a47aedc816ff8c5 (patch) | |
| tree | 7e5768afb6d7e895930d578954d3c4061998cb9a /arch/powerpc/include/asm/processor.h | |
| parent | misc: cxl: use mmgrab (diff) | |
| download | linux-dev-ed0bc98f8cbe4f8254759d333a47aedc816ff8c5.tar.xz linux-dev-ed0bc98f8cbe4f8254759d333a47aedc816ff8c5.zip | |
powerpc/64s: Reimplement power4_idle code in C
This implements the tricky tracing and soft irq handling bits in C,
leaving the low level bit to asm.
A functional difference is that this redirects the interrupt exit to
a return stub to execute blr, rather than the lr address itself. This
is probably barely measurable on real hardware, but it keeps the link
stack balanced.
Tested with QEMU.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
[mpe: Move power4_fixup_nap back into exceptions-64s.S]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20190711022404.18132-1-npiggin@gmail.com
Diffstat (limited to 'arch/powerpc/include/asm/processor.h')
| -rw-r--r-- | arch/powerpc/include/asm/processor.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/processor.h b/arch/powerpc/include/asm/processor.h index a9993e7a443b..e114eb36721c 100644 --- a/arch/powerpc/include/asm/processor.h +++ b/arch/powerpc/include/asm/processor.h @@ -412,6 +412,9 @@ static inline unsigned long get_clean_sp(unsigned long sp, int is_32) extern unsigned long isa300_idle_stop_noloss(unsigned long psscr_val); extern unsigned long isa300_idle_stop_mayloss(unsigned long psscr_val); extern unsigned long isa206_idle_insn_mayloss(unsigned long type); +#ifdef CONFIG_PPC_970_NAP +extern void power4_idle_nap(void); +#endif extern unsigned long cpuidle_disable; enum idle_boot_override {IDLE_NO_OVERRIDE = 0, IDLE_POWERSAVE_OFF}; |