This is a note to let you know that I've just added the patch titled
parisc: qemu idle sleep support
to the 4.14-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...
The filename of the patch is: parisc-qemu-idle-sleep-support.patch and it can be found in the queue-4.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.
From 310d82784fb4d60c80569f5ca9f53a7f3bf1d477 Mon Sep 17 00:00:00 2001
From: Helge Deller deller@gmx.de Date: Fri, 5 Jan 2018 21:55:38 +0100 Subject: parisc: qemu idle sleep support
From: Helge Deller deller@gmx.de
commit 310d82784fb4d60c80569f5ca9f53a7f3bf1d477 upstream.
Add qemu idle sleep support when running under qemu with SeaBIOS PDC firmware.
Like the power architecture we use the "or" assembler instructions, which translate to nops on real hardware, to indicate that qemu shall idle sleep.
Signed-off-by: Helge Deller deller@gmx.de Cc: Richard Henderson rth@twiddle.net Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- arch/parisc/kernel/process.c | 39 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 39 insertions(+)
--- a/arch/parisc/kernel/process.c +++ b/arch/parisc/kernel/process.c @@ -39,6 +39,7 @@ #include <linux/kernel.h> #include <linux/mm.h> #include <linux/fs.h> +#include <linux/cpu.h> #include <linux/module.h> #include <linux/personality.h> #include <linux/ptrace.h> @@ -184,6 +185,44 @@ int dump_task_fpu (struct task_struct *t }
/* + * Idle thread support + * + * Detect when running on QEMU with SeaBIOS PDC Firmware and let + * QEMU idle the host too. + */ + +int running_on_qemu __read_mostly; + +void __cpuidle arch_cpu_idle_dead(void) +{ + /* nop on real hardware, qemu will offline CPU. */ + asm volatile("or %%r31,%%r31,%%r31\n":::); +} + +void __cpuidle arch_cpu_idle(void) +{ + local_irq_enable(); + + /* nop on real hardware, qemu will idle sleep. */ + asm volatile("or %%r10,%%r10,%%r10\n":::); +} + +static int __init parisc_idle_init(void) +{ + const char *marker; + + /* check QEMU/SeaBIOS marker in PAGE0 */ + marker = (char *) &PAGE0->pad0; + running_on_qemu = (memcmp(marker, "SeaBIOS", 8) == 0); + + if (!running_on_qemu) + cpu_idle_poll_ctrl(1); + + return 0; +} +arch_initcall(parisc_idle_init); + +/* * Copy architecture-specific thread state */ int
Patches currently in stable-queue which might be from deller@gmx.de are
queue-4.14/parisc-fix-alignment-of-pa_tlb_lock-in-assembly-on-32-bit-smp-kernel.patch queue-4.14/parisc-qemu-idle-sleep-support.patch