Commit Graph

5 Commits

Author SHA1 Message Date
Ben Dooks 98dec91fa3 ARM: vexpress: add big endian support
Add support for the versatile express systems to boot big-endian.

Signed-off-by: Ben Dooks <ben.dooks@codethink.co.uk>
2013-10-19 20:46:34 +01:00
Mark Rutland 8121cf312a ARM: 7766/1: versatile: don't mark pen as __INIT
When booting fewer cores than are physically present on a versatile
platform (e.g. when passing maxcpus=N on the command line), some
secondary cores may remain in the holding pen, which is marked __INIT,
as each CPU's gic cpumask is initialised to 0xff, and thus an IPI to any
CPU will wake up *all* secondaries. This behaviour is crucial to the GIC
cpumask self-discovery. Late in the boot process, the memory comprising
the holding pen will be released to the kernel for more general use, and
may be overwritten with arbitrary data, which can cause the held
secondaries to start behaving unpredictably. This can lead to all manner
of odd behaviour from the kernel.

As preventing cpus from entering the pen would require invasive changes
to the GIC driver and to existing dts used in the wild, we instead
remove the __INIT marker from the pen, keeping it around and leaving the
unused secondary CPUs dormant.

Link: http://lists.infradead.org/pipermail/linux-arm-kernel/2013-June/175039.html

Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Acked-by: Pawel Moll <pawel.moll@arm.com>
Acked-by: Nicolas Pitre <nicolas.pitre@linaro.org>
Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2013-06-24 15:23:56 +01:00
Lorenzo Pieralisi 1585defb4c ARM: vexpress: extend the MPIDR range used for pen release check
In ARM multi-cluster systems the MPIDR affinity level 0 cannot be used as a
single cpu identifier, affinity levels 1 and 2 must be taken into account as
well.
This patch extends the MPIDR usage to affinity levels 1 and 2 in versatile
secondary cores start up code in order to compare the passed pen_release
value with the full-blown affinity mask.

Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: Liviu Dudau <liviu.dudau@arm.com>
Acked-by: Nicolas Pitre <nico@linaro.org>
Signed-off-by: Pawel Moll <pawel.moll@arm.com>
2013-01-24 12:19:23 +00:00
Pawel Moll 764a579fb5 ARM: versatile: Add missing ENDPROC to headsmp.S
Once the ENDPROC is in place, BSYM() in not longer necessary
to get correct pointer to versatile_secondary_startup().

Tested-by: Jon Medhurst <tixy@linaro.org>
Signed-off-by: Pawel Moll <pawel.moll@arm.com>
Acked-by: Dave Martin <dave.martin@linaro.org>
2012-01-16 08:35:25 -06:00
Russell King 0462b4477e ARM: realview/vexpress: consolidate SMP bringup code
Realview and Versatile Express share the same SMP bringup code, so
consolidate the two implementations.

Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2011-02-19 11:11:41 +00:00