kernel/arch/arm/mach-imx/hotplug.c, branch linux-6.2.y

ARM: imx: add smp support for imx7d

2021-06-12T04:02:57Z

Add SMP support for i.MX7D, including CPU hotplug support, for systems where TFA is not present. The motivation for bringing up the second i.MX7D core inside the kernel is that legacy vendor bootloaders usually do not implement PSCI support. This is a significant blocker for systems in the field that are running old bootloader versions to upgrade to a modern mainline kernel version, as only one CPU of the i.MX7D would be brought up. Bring up the second i.MX7D core inside the kernel to make the migration path to mainline kernel easier for the existing iMX7D users. Signed-off-by: Anson Huang Signed-off-by: Arulpandiyan Vadivel # Fix merge conflicts Signed-off-by: Leonard Crestez Signed-off-by: Marek Vasut # heavy cleanup Signed-off-by: Fabio Estevam Signed-off-by: Shawn Guo

ARM: imx: use generic function to exit coherency

2019-11-04T00:25:56Z

The common ARM architecture code provides a generic function to exit coherency called v7_exit_coherency_flush(). Replace the machine specific implementation using the generic function. Tested on a i.MX 6Dual by hotplugging the secondary CPU under load through sysfs several 1000 times. Tested-by: Stefan Agner Signed-off-by: Stefan Agner Signed-off-by: Shawn Guo

treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 159

2019-05-30T18:26:37Z

Based on 1 normalized pattern(s): the code contained herein is licensed under the gnu general public license you may obtain a copy of the gnu general public license version 2 or later at the following locations http www opensource org licenses gpl license html http www gnu org copyleft gpl html extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 161 file(s). Signed-off-by: Thomas Gleixner Reviewed-by: Richard Fontana Reviewed-by: Allison Randal Reviewed-by: Kate Stewart Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070033.383790741@linutronix.de Signed-off-by: Greg Kroah-Hartman

ARM: imx: do not return from imx_cpu_die() call

2013-10-21T01:37:31Z

When imx_cpu_die() is being called, the cpu should never return from the call but just in WFI and wait for hardware to take it down. So let's do cpu_do_idle() repeatly in the call. Doing this help improve the relibility of hotplug operation. Signed-off-by: Shawn Guo

ARM: imx: compile fix for hotplug.c

2013-05-09T20:05:22Z

Commit bca7a5a (ARM: cpu hotplug: remove majority of cache flushing from platforms) removes include of and hence discovers a few indirect inclusion and declaration problems as below. CC arch/arm/mach-imx/hotplug.o In file included from arch/arm/mach-imx/hotplug.c:16:0: arch/arm/mach-imx/common.h:100:29: warning: ‘struct pt_regs’ declared inside parameter list [enabled by default] arch/arm/mach-imx/common.h:100:29: warning: its scope is only this definition or declaration, which is probably not what you want [enabled by default] arch/arm/mach-imx/common.h:101:29: warning: ‘struct pt_regs’ declared inside parameter list [enabled by default] arch/arm/mach-imx/hotplug.c: In function ‘imx_cpu_die’: arch/arm/mach-imx/hotplug.c:53:2: error: implicit declaration of function ‘cpu_do_idle’ [-Werror=implicit-function-declaration] arch/arm/mach-imx/hotplug.c: In function ‘imx_cpu_kill’: arch/arm/mach-imx/hotplug.c:58:26: error: ‘jiffies’ undeclared (first use in this function) arch/arm/mach-imx/hotplug.c:58:26: note: each undeclared identifier is reported only once for each function it appears in arch/arm/mach-imx/hotplug.c:58:2: error: implicit declaration of function ‘msecs_to_jiffies’ [-Werror=implicit-function-declaration] arch/arm/mach-imx/hotplug.c:61:3: error: implicit declaration of function ‘time_after’ [-Werror=implicit-function-declaration] Fix them by adding the needed inclusion and declaration. Signed-off-by: Shawn Guo Acked-by: Arnd Bergmann Acked-by: Uwe Kleine-König Signed-off-by: Olof Johansson

ARM: cpu hotplug: remove majority of cache flushing from platforms

2013-04-18T19:08:04Z

Remove the majority of cache flushing calls from the individual platform files. This is now handled by the core code. Signed-off-by: Russell King

ARM: imx: fix sync issue between imx_cpu_die and imx_cpu_kill

2013-03-26T12:25:45Z

There is a sync issue with hotplug operation. It's possible that when imx_cpu_kill gets running on primary core, the imx_cpu_die execution on the core which is to be killed hasn't been finished yet. The problem will very likely be hit when running suspend without no_console_suspend setting on kernel cmdline. It uses cpu jumping argument register to sync imx_cpu_die and imx_cpu_kill. The register will be set in imx_cpu_die and imx_cpu_kill will wait for the register being cleared to actually kill the cpu. Signed-off-by: Shawn Guo Cc:

ARM: imx: disable cpu in .cpu_kill hook

2013-01-14T14:17:17Z

It's buggy to disable the cpu that is being hot-unplugged in .cpu_die hook which runs on the cpu itself. Instead, it should be done in .cpu_kill which runs on the thread (another cpu) that asks for shutting down the cpu. Move imx_enable_cpu(cpu, false) call into .cpu_kill hook, and leave the cpu to be hot-unplugged in WFI within .cpu_die, so that we can get a more stable cpu hot-plug operation. Signed-off-by: Shawn Guo

ARM: imx: include common.h rather than mach/common.h

2012-10-15T02:03:10Z

Rename mach-imx/include/mach/common.h to mach-imx/common.h and update all users to include common.h rather than mach/common.h. It also removes an unneeded inclusion to common.h in mach-imx/devices/devices.c. Signed-off-by: Shawn Guo Acked-by: Sascha Hauer Acked-by: Arnd Bergmann

ARM: SoC: convert imx6q to SMP operations

2012-09-14T09:15:00Z

Convert the imx6q platform to use struct smp_operations to provide its SMP and CPU hotplug operations. Signed-off-by: Marc Zyngier Acked-by: Nicolas Pitre Cc: Shawn Guo Signed-off-by: Arnd Bergmann