linux-toradex.git/arch/mips/include/asm/smp-ops.h, branch v5.18

MIPS: only register MT SMP ops if MT is supported

2021-12-21T12:51:39+00:00

Verify that the current CPU actually supports multi-threading before
registering MT SMP ops, instead of unconditionally registering them if
the kernel is compiled with CONFIG_MIPS_MT_SMP.

Suggested-by: Jiaxun Yang 
Signed-off-by: Sander Vanheule 
Signed-off-by: Thomas Bogendoerfer

MIPS: SGI-IP27: do boot CPU init later

2019-02-19T20:46:03+00:00

To make use of per_cpu variables in interrupt code per_cpu_init() must
be done after setup_per_cpu_areas(). This is achieved by calling it
in smp_prepare_boot_cpu() via a new smp_ops method.

Signed-off-by: Thomas Bogendoerfer 
Signed-off-by: Paul Burton 
Cc: Ralf Baechle 
Cc: James Hogan 
Cc: linux-mips@vger.kernel.org
Cc: linux-kernel@vger.kernel.org

MIPS: kexec: Make a framework for both jumping and halting on nonboot CPUs

2018-09-22T17:31:50+00:00

The existing implementation lets machine_kexec() CPU jump to reboot code
buffer, whereas other CPUs to relocated_kexec_smp_wait. The natural way to
bring up an SMP new kernel would be to let CPU0 do it while others being
halted. For those failing to do so, fall back to the jumping method.

Signed-off-by: Dengcheng Zhu 
[paul.burton@mips.com: Guard kexec_nonboot_cpu_jump with CONFIG_SMP]
Signed-off-by: Paul Burton 
Patchwork: https://patchwork.linux-mips.org/patch/20570/
Cc: pburton@wavecomp.com
Cc: ralf@linux-mips.org
Cc: linux-mips@linux-mips.org
Cc: rachel.mozes@intel.com

MIPS: CPS: Have asm/mips-cps.h include CM & CPC headers

2017-08-29T22:57:27+00:00

With Coherence Manager (CM) 3.5 information about the topology of the
system, which has previously only been available through & accessed from
the CM, is now also provided by the Cluster Power Controller (CPC). This
includes a new CPC_CONFIG register mirroring GCR_CONFIG, and similarly a
new CPC_Cx_CONFIG register mirroring GCR_Cx_CONFIG.

In preparation for adjusting functions such as mips_cm_numcores(), which
have previously only needed to access the CM, to also access the CPC
this patch modifies the way we use the various CPS headers. Rather than
having users include asm/mips-cm.h or asm/mips-cpc.h individually we
instead have users include asm/mips-cps.h which in turn includes
asm/mips-cm.h & asm/mips-cpc.h. This means that users will gain access
to both CM & CPC registers by including one header, and most importantly
it makes asm/mips-cps.h an ideal location for helper functions which
need to access the various components of the CPS.

Signed-off-by: Paul Burton 
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/17015/
Patchwork: https://patchwork.linux-mips.org/patch/17217/
Signed-off-by: Ralf Baechle

MIPS: SMP: Allow boot_secondary SMP op to return errors

2017-08-29T22:57:27+00:00

Allow the boot_secondary SMP op to return an error to __cpu_up(), which
will in turn return it to its caller.

This will allow SMP implementations to return errors quickly in cases
they they know have failed, rather than relying upon __cpu_up()
eventually timing out waiting for the cpu_running completion.

Signed-off-by: Paul Burton 
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/17014/
Signed-off-by: Ralf Baechle

MIPS: SMP: Constify smp ops

2017-08-29T13:21:50+00:00

smp_ops providers do not modify their ops structures, so they should be
made const for robustness. Since currently the MIPS kernel is not mapped
with memory protection, this does not in itself provide any security
benefit, but it still makes sense to make this change.

There are also slight code size efficincies from the structure being
made read-only, saving 128 bytes of kernel text on a
pistachio_defconfig.
Before:
   text	   data	    bss	    dec	    hex	filename
7187239	1772752	 470224	9430215	 8fe4c7	vmlinux
After:
   text	   data	    bss	    dec	    hex	filename
7187111	1772752	 470224	9430087	 8fe447	vmlinux

Signed-off-by: Matt Redfearn 
Cc: Sebastian Andrzej Siewior 
Cc: Arnd Bergmann 
Cc: Marcin Nowakowski 
Cc: Bart Van Assche 
Cc: Masahiro Yamada 
Cc: Huacai Chen 
Cc: Paul Gortmaker 
Cc: Kevin Cernekee 
Cc: Thomas Gleixner 
Cc: Doug Ledford 
Cc: James Hogan 
Cc: Joe Perches 
Cc: Florian Fainelli 
Cc: Ingo Molnar 
Cc: Paul Burton 
Cc: Andrew Morton 
Cc: Steven J. Hill 
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/16784/
Signed-off-by: Ralf Baechle

MIPS: Make smp CMP, CPS and MT use the new generic IPI functions

2016-02-25T09:56:58+00:00

This commit does several things to avoid breaking bisectability.

	1- Remove IPI init code from irqchip/mips-gic
	2- Implement the new irqchip->send_ipi() in irqchip/mips-gic
	3- Select GENERIC_IRQ_IPI Kconfig symbol for MIPS_GIC
	4- Change MIPS SMP to use the generic IPI implementation

Only the SMP variants that use GIC were converted as it's the only irqchip that
will have the support for generic IPI for now.

Signed-off-by: Qais Yousef 
Acked-by: Ralf Baechle 
Cc: 
Cc: 
Cc: 
Cc: 
Cc: 
Cc: Qais Yousef 
Link: http://lkml.kernel.org/r/1449580830-23652-18-git-send-email-qais.yousef@imgtec.com
Signed-off-by: Thomas Gleixner

MIPS: SMP: Remove plat_smp_ops cpus_done method.

2014-05-27T09:06:42+00:00

Nothing was using the method and there isn't any need for this hook.  This
leaves smp_cpus_done() empty for the moment.

As suggested by Paul Bolle .

Signed-off-by: Ralf Baechle

MIPS: Fix warning when including smp-ops.h with CONFIG_SMP=n

2014-03-31T16:17:13+00:00

The gic_send_ipi_mask function declared in smp-ops.h takes a struct
cpumask argument, but linux/cpumask.h is only included within an #ifdef
CONFIG_SMP. Move the gic_ function declarations within that #ifdef too
to fix warnings during build such as:

In file included from arch/mips/fw/arc/init.c:15:0:
/mnt/buildbot/kernel/mips/slave/mips-linux__allno_/build/arch/mips/include/asm/smp-ops.h:62:44:
warning: 'struct cpumask' declared inside parameter list [enabled by
default]
 extern void gic_send_ipi_mask(const struct cpumask *mask, unsigned int
action);

Reported-by: Markos Chandras 
Signed-off-by: Paul Burton 
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/6655/
Signed-off-by: Ralf Baechle

MIPS: Malta: Make use of generic CM support

2014-03-26T22:09:06+00:00

Remove the Malta-specific CM probe code and instead make use of the
newly added generic CM code.

Signed-off-by: Paul Burton 
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/6364/
Signed-off-by: Ralf Baechle