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997e93d4df
linux/arch/mips
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Paul Burton 997e93d4df
MIPS: Hang more efficiently on halt/powerdown/restart 
The generic MIPS implementations of halting, powering down or restarting
the system all hang using a busy loop as a last resort. We have many
platforms which avoid this loop by implementing their own, many using
some variation upon executing a wait instruction to lower CPU power
usage if we reach this point.

In order to prepare for cleaning up these various custom implementations
of the same thing, this patch makes the generic machine_halt(),
machine_power_off() & machine_restart() functions each make use of the
wait instruction to lower CPU power usage in cases where we know that
the wait instruction is available. If wait isn't known to be supported
then we fall back to calling cpu_wait(), and if we don't have a
cpu_wait() callback then we effectively continue using a busy loop.

In effect the new machine_hang() function provides a superset of the
functionality that the various platforms currently provide differing
subsets of.

Signed-off-by: Paul Burton <paul.burton@mips.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/17178/
Signed-off-by: James Hogan <jhogan@kernel.org>
2018-03-09 11:22:43 +00:00
..
alchemy MIPS: Alchemy: Constify gpio_led 2018-02-19 10:55:35 +00:00
ar7 MIPS: AR7: Constify gpio_led 2018-02-19 10:55:36 +00:00
ath25 MIPS: ath25: Avoid undefined early_serial_setup() without SERIAL_8250_CONSOLE 2018-01-10 16:37:28 +01:00
ath79 Merge branch 'i2c/for-4.15' of ssh://gitolite.kernel.org/pub/scm/linux/kernel/git/wsa/linux 2017-11-14 17:52:21 -08:00
bcm47xx MIPS: bcm47xx: enable ZBOOT support 2018-01-24 11:20:29 +00:00
bcm63xx MIPS: BCM63XX: kconfig: Remove blank help text 2018-02-02 23:53:10 +09:00
bmips License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
boot MIPS: BMIPS: Add Broadcom STB watchdog nodes 2018-03-06 00:25:18 +00:00
cavium-octeon MIPS: Octeon: Fix logging messages with spurious periods after newlines 2018-02-19 10:55:34 +00:00
cobalt MIPS: Cobalt: Fix typo 2016-08-03 08:16:30 +02:00
configs MIPS: generic: Enable crc32-mips on r6 configs 2018-02-19 20:50:36 +00:00
crypto MIPS: crypto: Add crc32 and crc32c hw accelerated module 2018-02-19 20:50:36 +00:00
dec License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
emma MIPS: Avoid old-style declaration 2017-01-25 02:51:11 +01:00
fw License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
generic MIPS: Generic: Support GIC in EIC mode 2018-02-05 14:36:03 +00:00
include MIPS: Add crc instruction support flag to elf_hwcap 2018-02-19 20:50:35 +00:00
jazz MIPS: Set I/O port resource types correctly 2017-12-18 23:07:45 -06:00
jz4740 MIPS: ingenic: Initial GCW Zero support 2018-01-18 22:08:10 +00:00
kernel MIPS: Hang more efficiently on halt/powerdown/restart 2018-03-09 11:22:43 +00:00
kvm KVM: introduce kvm_arch_vcpu_async_ioctl 2017-12-14 09:26:59 +01:00
lantiq MIPS changes for 4.15 2017-11-15 11:36:08 -08:00
lasat treewide: setup_timer() -> timer_setup() 2017-11-21 15:57:07 -08:00
lib MIPS: Implement __multi3 for GCC7 MIPS64r6 builds 2018-01-11 14:40:31 +01:00
loongson32 License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
loongson64 MIPS changes for 4.16 2018-02-07 11:22:44 -08:00
math-emu MIPS: math-emu: Mark fall throughs in switch statements with a comment 2017-12-12 17:20:20 +01:00
mm MIPS: Remove duplicate includes 2018-02-19 10:55:35 +00:00
mti-malta MIPS: Set I/O port resource types correctly 2017-12-18 23:07:45 -06:00
net bpf, mips64: remove unneeded zero check from div/mod with k 2018-01-26 16:42:06 -08:00
netlogic mips/netlogic: remove swiotlb support 2018-01-15 09:35:59 +01:00
oprofile License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
paravirt License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
pci MIPS changes for 4.15 2017-11-15 11:36:08 -08:00
pic32 License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
pistachio License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
pmcs-msp71xx License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
pnx833x mtd: nand: Rename nand.h into rawnand.h 2017-08-13 10:11:49 +02:00
power License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
ralink MIPS: ralink: Fix platform_get_irq's error checking 2018-01-10 16:45:44 +01:00
rb532 MIPS: RB532: Avoid undefined mac_pton without GENERIC_NET_UTILS 2018-01-10 16:39:03 +01:00
sgi-ip22 Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2017-11-13 17:56:58 -08:00
sgi-ip27 License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
sgi-ip32 mips: ip22/32: Convert timers to use timer_setup() 2017-11-02 15:50:36 -07:00
sibyte License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
sni License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
tools Update MIPS email addresses 2017-11-03 09:02:30 -07:00
txx9 MIPS: TXX9: Constify gpio_led 2018-02-19 10:55:36 +00:00
vdso License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
vr41xx License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
Kbuild MIPS: Disable Werror when W= is set 2017-04-10 11:56:07 +02:00
Kbuild.platforms MIPS: Xilfpga: Switch to using generic defconfigs 2017-11-08 22:54:14 +00:00
Kconfig MIPS: crypto: Add crc32 and crc32c hw accelerated module 2018-02-19 20:50:36 +00:00
Kconfig.debug MIPS: Fix CPS SMP NS16550 UART defaults 2018-01-10 16:44:49 +01:00
Makefile MIPS: Expand help text to list generic defconfigs 2018-03-05 15:11:42 +00:00
Makefile.postlink License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00