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2012-01-16ARM: versatile: Add missing ENDPROC to headsmp.SPawel Moll1-2/+1
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>
2011-10-20ARM: smp: fix clipping of number of CPUsRussell King1-6/+4
Rather than clipping the number of CPUs using the compile-time NR_CPUS constant, use the runtime nr_cpu_ids value instead. This allows the nr_cpus command line option to work as expected. Cc: <stable@kernel.org> Reported-by: Mark Salter <msalter@redhat.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2011-07-07ARM: 6993/1: platsmp: Allow secondary cpu hotplug with maxcpus=1Stephen Boyd1-8/+0
If an ARM system has multiple cpus in the same socket and the kernel is booted with maxcpus=1, secondary cpus are possible but not present due to how platform_smp_prepare_cpus() is called. Since most typical ARM processors don't actually support physical hotplug, initialize the present map to be equal to the possible map in generic ARM SMP code. Also, always call platform_smp_prepare_cpus() as long as max_cpus is non-zero (0 means no SMP) to allow platform code to do any SMP setup. After applying this patch it's possible to boot an ARM system with maxcpus=1 on the command line and then hotplug in secondary cpus via sysfs. This is more in line with how x86 does things. Signed-off-by: Stephen Boyd <sboyd@codeaurora.org> Cc: Paul Mundt <lethal@linux-sh.org> Cc: Kukjin Kim <kgene.kim@samsung.com> Cc: David Brown <davidb@codeaurora.org> Cc: Tony Lindgren <tony@atomide.com> Cc: Srinidhi Kasagar <srinidhi.kasagar@stericsson.com> Cc: Linus Walleij <linus.walleij@stericsson.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2011-05-23ARM: consolidate SMP cross call implementationRussell King1-0/+3
Rather than having each platform class provide a mach/smp.h header for smp_cross_call(), arrange for them to register the function with the core ARM SMP code instead. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2011-02-19ARM: realview/vexpress: consolidate SMP bringup codeRussell King1-95/+3
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>
2011-01-25ARM: realview,vexpress: fix section mismatch warning for pen_releaseRussell King1-1/+1
Fix two section mismatch warnings in the platform SMP bringup code for Realview and Versatile Express: WARNING: arch/arm/mach-realview/built-in.o(.text+0x8ac): Section mismatch in reference from the function write_pen_release() to the variable .cpuinit.data:pen_release The function write_pen_release() references the variable __cpuinitdata pen_release. This is often because write_pen_release lacks a __cpuinitdata annotation or the annotation of pen_release is wrong. WARNING: arch/arm/mach-vexpress/built-in.o(.text+0x7b4): Section mismatch in reference from the function write_pen_release() to the variable .cpuinit.data:pen_release The function write_pen_release() references the variable __cpuinitdata pen_release. This is often because write_pen_release lacks a __cpuinitdata annotation or the annotation of pen_release is wrong. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2011-01-06Merge branch 'misc' into develRussell King1-78/+36
Conflicts: arch/arm/Kconfig arch/arm/common/Makefile arch/arm/kernel/Makefile arch/arm/kernel/smp.c
2010-12-20ARM: Fix subtle race in CPU pen_release hotplug codeRussell King1-4/+15
There is a subtle race in the CPU hotplug code, where a CPU which has been offlined can online itself before being requested, which results in things going astray on the next online/offline cycle. What happens in the normal online/offline/online cycle is: CPU0 CPU3 requests boot of CPU3 pen_release = 3 flush cache line checks pen_release, reads 3 starts boot pen_release = -1 ... requests CPU3 offline ... ... dies ... checks pen_release, reads -1 requests boot of CPU3 pen_release = 3 flush cache line checks pen_release, reads 3 starts boot pen_release = -1 However, as the write of -1 of pen_release is not fully flushed back to memory, and the checking of pen_release is done with caches disabled, this allows CPU3 the opportunity to read the old value of pen_release: CPU0 CPU3 requests boot of CPU3 pen_release = 3 flush cache line checks pen_release, reads 3 starts boot pen_release = -1 ... requests CPU3 offline ... ... dies ... checks pen_release, reads 3 starts boot pen_release = -1 requests boot of CPU3 pen_release = 3 flush cache line Fix this by grouping the write of pen_release along with its cache line flushing code to ensure that any update to pen_release is always pushed out to physical memory. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2010-12-20ARM: SMP: consolidate trace_hardirqs_off() into common SMP codeRussell King1-2/+0
All platforms call trace_hardirqs_off() in their secondary startup code, so move this into the core SMP code - it doesn't need to be in the per-platform code. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2010-12-20ARM: SMP: consolidate the common parts of smp_prepare_cpus()Russell King1-30/+11
There is a certain amount of smp_prepare_cpus() which doesn't belong in the platform support code - that is, code which is invariant to the SMP implementation. Move this code into arch/arm/kernel/smp.c, and add a platform_ prefix to the original function. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2010-12-20ARM: SMP: get rid of references to poke_milo and MiloRussell King1-32/+12
Milo is an old boot loader, which is no longer relevant for these platforms. References to it are misleading. Move the code out of poke_milo(), and remove references to milo in comments. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2010-12-20ARM: SMP: get rid of get_core_count()Russell King1-9/+4
We don't need this small function as well as scu_get_core_count() Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2010-12-20ARM: SMP: Clean up ncores sanity checksRussell King1-7/+0
scu_get_core_count() never returns zero cores, so we don't need to check and correct if ncores is zero. Tegra was missing the check against NR_CPUS, leading to a potential bitfield overflow if this becomes the case. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2010-12-20ARM: SMP: move CPU number sanity checks to smp_init_cpus()Russell King1-10/+10
Ensure that the number of CPUs is sanity checked before setting the number of possible CPUs. This avoids any chance of overflowing the cpu_possible bitmap. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2010-12-14ARM: GIC: Remove MMIO address from gic_cpu_init, rename to gic_secondary_initRussell King1-1/+1
We don't need to re-pass the base address for the CPU interfaces to the GIC for secondary CPUs, as it will never be different from the boot CPU - and even if it was, we'd overwrite the boot CPU's base address. Get rid of this argument, and rename to gic_secondary_init(). Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Tested-by: Abhijeet Dharmapurikar <adharmap@codeaurora.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2010-12-03ARM: SMP: pass an ipi number to smp_cross_call()Russell King1-1/+1
This allows us to use smp_cross_call() to trigger a number of different software generated interrupts, rather than combining them all on one SGI. Recover the SGI number via do_IPI. Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2009-11-05RealView: Remove duplicated #define REALVIEW_SYS_FLAGS* statementsColin Tuckley1-4/+1
The platsmp.c file defines the REALVIEW_SYS_FLAGS* macros which are already present in platform.h. Just use the latter. Signed-off-by: Colin Tuckley <colin.tuckley@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2009-07-24Thumb-2: Pass a Thumb-2 address to the secondary CPUs to jump toCatalin Marinas1-12/+6
This patch sets bit 0 in the startup address passed to the secondary CPUs so that they branch into Thumb-2 mode. Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2009-06-11Merge branch 'for-rmk' of git://linux-arm.org/linux-2.6 into develRussell King1-0/+4
Conflicts: arch/arm/Kconfig arch/arm/kernel/smp.c arch/arm/mach-realview/Makefile arch/arm/mach-realview/platsmp.c
2009-05-30RealView: Add support for the RealView/PBX platformColin Tuckley1-0/+4
This is a RealView platform supporting core tiles with ARM11MPCore, Cortex-A8 or Cortex-A9 (multicore) processors. It has support for MMC, CompactFlash, PCI-E. Signed-off-by: Colin Tuckley <colin.tuckley@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2009-05-28[ARM] smp: use new cpumask functionsRussell King1-2/+2
Convert cpu_*_mask bit twiddling to the new set_cpu_*() API. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2009-05-17[ARM] smp: separate SCU support code from realviewRussell King1-24/+5
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2009-05-17[ARM] smp: SCU is used on non-realview platformsRussell King1-1/+1
The SCU can be used by non-realview platforms, so make it visible for other people to use rather than having them copy the header file. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2009-05-17[ARM] smp: move core localtimer support out of platform specific filesRussell King1-7/+7
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2009-05-17[ARM] realview: fix broadcast tick supportRussell King1-4/+2
Having discussed broadcast tick support with Thomas Glexiner, the broadcast tick devices should be registered with a higher rating than the global tick device, and it should have the ONESHOT and PERIODIC feature flags set. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk> Acked-by: Thomas Glexiner <tglx@linutronix.de>
2009-05-17[ARM] realview: remove useless smp_cross_call_done()Russell King1-7/+0
smp_cross_call_done() is a no-op for MPCore, and since it's only used by platform code, there's no point in having it unless it's doing something. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2009-05-17[ARM] smp: fix cpumask usage in ARM SMP codeRussell King1-2/+2
The ARM SMP code wasn't properly updated for the cpumask changes, which results in smp_timer_broadcast() broadcasting ticks to non-online CPUs. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2009-01-08[ARM] Fix realview buildRussell King1-0/+1
arch/arm/mach-realview/platsmp.c:140: error: 'jiffies' undeclared (first use in this function) drivers/amba/bus.c:246: error: 'NO_IRQ' undeclared (first use in this function) Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2008-12-01RealView: Clean up the machine_is_*() calls in platsmp.cCatalin Marinas1-25/+16
Some of the calls weren't necessary and some others were duplicated. This patch tidies up the platsmp.c file. Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2008-12-01RealView: Use only the shadow mapping of ARM11MPCore local timersCatalin Marinas1-1/+1
All the cases where the local timer for a CPU is accessed happen on the corresponding current CPU, hence no need to access the per-CPU local timer mappings. Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2008-12-01RealView: Add Cortex-A9 support to the EB boardJon Callan1-4/+8
This patch adds the necessary definitions and Kconfig entries to enable Cortex-A9 (ARMv7 SMP) tiles on the RealView/EB board. Signed-off-by: Jon Callan <Jon.Callan@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2008-09-06[ARM] Convert asm/io.h to linux/io.hRussell King1-1/+1
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2008-08-07[ARM] Move include/asm-arm/arch-* to arch/arm/*/include/machRussell King1-4/+4
This just leaves include/asm-arm/plat-* to deal with. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2008-08-07[ARM] Remove asm/hardware.h, use asm/arch/hardware.h insteadRussell King1-1/+1
Remove includes of asm/hardware.h in addition to asm/arch/hardware.h. Then, since asm/hardware.h only exists to include asm/arch/hardware.h, update everything to directly include asm/arch/hardware.h and remove asm/hardware.h. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2008-06-30[ARM] 5131/1: Annotate platform_secondary_init with trace_hardirqs_offCatalin Marinas1-0/+2
This patch annotates the platform_secondary_init function in arch/arm/mach-realview/platsmp.c with trace_hardirqs_off to avoid a warning when LOCKDEP and TRACE_IRQFLAGS are enabled. Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2008-04-18RealView: Add the SMP initialisation support for PB11MPCoreCatalin Marinas1-2/+11
This patch adds the initialisation calls for the SMP support on the PB11MPCore platform. Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2008-04-18RealView: Move the SCU initialisation out of __v6_setupCatalin Marinas1-8/+35
This patch moves the SCU initialisation from __v6_setup to the smp_prepare_cpus() function as it relies on platform-specific settings. Changes to get_core_count() are mainly for allowing cleaner code with the upcoming PB11MPCore patches. Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2008-02-04[ARM] 4818/1: RealView: Add core-tile detectionCatalin Marinas1-3/+9
This patch adds the core-tile detection and only enables devices if the corresponding tile is present. It currently detects the ARM11MPCore via the core_tile_eb11mp() macro. Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2008-02-04[ARM] 4816/1: RealView: Move the platform-specific definitions into board-eb.hCatalin Marinas1-2/+2
This patch moves the platform specific definitions from platform.h into the board-eb.h file. It drops the INT_* definitions as they are no longer used in irqs.h (moved to board-eb.h). It renames REALVIEW_* macros to REALVIEW_EB_* or REALVIEW_EB11MP_* to distinguish between standard EB and EB + the ARM11MPCore tile. The platform.h file contains common definitions to the RealView platforms and it is only directly included in board-*.h files. Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2008-02-04[ARM] 4814/1: RealView: Add broadcasting clockevents support for ARM11MPCoreCatalin Marinas1-1/+5
This patch adds dummy local timers for each CPU so that the board clock device is used to broadcast events to the other CPUs. The patch also adds the declaration for the dummy_timer_setup function (the equivalent of local_timer_setup when CONFIG_LOCAL_TIMERS is not set). Due to the way clockevents work, the dummy timer on the first CPU has to be registered before the board timer. Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2007-02-16[ARM] 4201/1: SMP barriers pair needed for the secondary boot processCatalin Marinas1-0/+2
In some situations, the pen_release store in platform_secondary_init() may stay forever in the write buffer while the CPU is waiting on the boot_lock to be released in boot_secondary(). The primary CPU could never see the pen_release update without the barriers. Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2007-02-15[ARM] 4108/2: Allow multiple GIC interrupt controllers in a systemCatalin Marinas1-1/+1
The current implementation only assumes one GIC to be present in the system. However, there are platforms with more than one cascaded interrupt controllers (RealView/EB MPCore for example). Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2006-02-16[ARM] Fix SMP initialisation oopsRussell King1-6/+15
A change to the SMP initialisation caused the following oops: CPU1: Booted secondary processor CPU1: D VIPT write-back cache CPU1: I cache: 32768 bytes, associativity 4, 32 byte lines, 256 sets CPU1: D cache: 32768 bytes, associativity 4, 32 byte lines, 256 sets <7>Calibrating delay loop... 83.14 BogoMIPS (lpj=415744) <1>Unable to handle kernel NULL pointer dereference at virtual address 0000001c ... PC is at enqueue_task+0x1c/0x64 LR is at activate_task+0xcc/0xe4 SMP initialisation now requires cpu_possible_map to be initialised in setup_arch(). Move this from smp_prepare_cpus() to smp_init_cpus() and call it from our setup_arch() if CONFIG_SMP is enabled. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2005-11-16[ARM] Fix arch-realview/system.h to use __io_address()Russell King1-2/+1
Move __io_address to arch-realview/hardware.h, drop core.h from platsmp.c and localtimer.c, and include asm/io.h where required. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2005-11-09[ARM SMP] Add local timer support for Realview MPcoreRussell King1-0/+5
Add platform specific parts for local timer support for the Realview board. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2005-11-08[ARM SMP] Fix some sparse warnings in SMP codeRussell King1-5/+5
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2005-11-07[ARM SMP] Add Realview MPcore SMP supportRussell King1-0/+195
Add SMP support for the MPcore tile fitted to the Realview ARM platform. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>