- 23 10月, 2017 1 次提交
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由 Vladimir Murzin 提交于
Currently, there are several issues with how MPU is setup: 1. We won't boot if MPU is missing 2. We won't boot if use XIP 3. Further extension of MPU setup requires asm skills The 1st point can be relaxed, so we can continue with boot CPU even if MPU is missed and fail boot for secondaries only. To address the 2nd point we could create region covering CONFIG_XIP_PHYS_ADDR - _end and that might work for the first stage of MPU enable, but due to MPU's alignment requirement we could cover too much, IOW we need more flexibility in how we're partitioning memory regions... and it'd be hardly possible to archive because of the 3rd point. This patch is trying to address 1st and 3rd issues and paves the path for 2nd and further improvements. The most visible change introduced with this patch is that we start using mpu_rgn_info array (as it was supposed?), so change in MPU setup done by boot CPU is recorded there and feed to secondaries. It allows us to keep minimal region setup for boot CPU and do the rest in C. Since we start programming MPU regions in C evaluation of MPU constrains (number of regions supported and minimal region order) can be done once, which in turn open possibility to free-up "probe" region early. Tested-by: NSzemző András <sza@esh.hu> Tested-by: NAlexandre TORGUE <alexandre.torgue@st.com> Tested-by: NBenjamin Gaignard <benjamin.gaignard@linaro.org> Signed-off-by: NVladimir Murzin <vladimir.murzin@arm.com> Signed-off-by: NRussell King <rmk+kernel@armlinux.org.uk>
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- 22 9月, 2015 2 次提交
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由 Masahiro Yamada 提交于
The core framework does not modify smp_operations structures. To clarify it, this commit adds 'const' qualifier to the 'ops' member of struct of_cpu_method and the 'smp' member of struct machine_desc. This change allows each SoC code to add 'const' qualifier to its smp_operation structure. Signed-off-by: NMasahiro Yamada <yamada.masahiro@socionext.com> Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
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由 Masahiro Yamada 提交于
This function just copies '*ops' to 'smp_ops', so the given structure '*ops' is not modified at all. Signed-off-by: NMasahiro Yamada <yamada.masahiro@socionext.com> Acked-by: NStephen Boyd <sboyd@codeaurora.org> Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
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- 26 8月, 2015 1 次提交
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由 Stephen Boyd 提交于
The only caller of cpu_die() on ARM is arch_cpu_idle_dead(), so let's simplify the code by renaming cpu_die() to arch_cpu_idle_dead(). While were here, drop the __ref annotation because __cpuinit is gone nowadays. Signed-off-by: NStephen Boyd <sboyd@codeaurora.org> Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
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- 01 8月, 2015 1 次提交
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由 Stephen Boyd 提交于
Writes to /sys/.../cpuX/online fail if we determine the platform doesn't support hotplug for that CPU. Furthermore, if the cpu_die op isn't specified the system hangs when we try to offline a CPU and it comes right back online unexpectedly. Let's figure this stuff out before we make the sysfs nodes so that the online file doesn't even exist if it isn't (at least sometimes) possible to hotplug the CPU. Add a new 'cpu_can_disable' op and repoint all 'cpu_disable' implementations at it because all implementers use the op to indicate if a CPU can be hotplugged or not in a static fashion. With PSCI we may need to add a 'cpu_disable' op so that the secure OS can be migrated off the CPU we're trying to hotplug. In this case, the 'cpu_can_disable' op will indicate that all CPUs are hotpluggable by returning true, but the 'cpu_disable' op will make a PSCI migration call and occasionally fail, denying the hotplug of a CPU. This shouldn't be any worse than x86 where we may indicate that all CPUs are hotpluggable but occasionally we can't offline a CPU due to check_irq_vectors_for_cpu_disable() failing to find a CPU to move vectors to. Cc: Mark Rutland <mark.rutland@arm.com> Cc: Nicolas Pitre <nico@linaro.org> Cc: Dave Martin <Dave.Martin@arm.com> Acked-by: Simon Horman <horms@verge.net.au> [shmobile portion] Tested-by: NSimon Horman <horms@verge.net.au> Cc: Magnus Damm <magnus.damm@gmail.com> Cc: <linux-sh@vger.kernel.org> Tested-by: NTyler Baker <tyler.baker@linaro.org> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Signed-off-by: NStephen Boyd <sboyd@codeaurora.org> Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
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- 02 6月, 2015 2 次提交
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由 Yingjoe Chen 提交于
Put secondary_startup_arm() prototype in arch/arm/include/asm/smp.h so users doesn't have to add extern prototype in their code. Signed-off-by: NYingjoe Chen <yingjoe.chen@mediatek.com> Reviewed-by: NMatthias Brugger <matthias.bgg@gmail.com> Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
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由 Russell King 提交于
Re-engineer the LPAE TTBR setup code. Rather than passing some shifted address in order to fit in a CPU register, pass either a full physical address (in the case of r4, r5 for TTBR0) or a PFN (for TTBR1). This removes the ARCH_PGD_SHIFT hack, and the last dangerous user of cpu_set_ttbr() in the secondary CPU startup code path (which was there to re-set TTBR1 to the appropriate high physical address space on Keystone2.) Tested-by: NMurali Karicheri <m-karicheri2@ti.com> Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
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- 27 8月, 2014 1 次提交
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由 Geert Uytterhoeven 提交于
After becoming a mandatory function, boot_secondary() is no longer used outside arch/arm/kernel/smp.c. Hence remove its public prototype, and, as suggested by Arnd, let it be absorbed by its single caller. Signed-off-by: NGeert Uytterhoeven <geert+renesas@glider.be> Acked-by: NArnd Bergmann <arnd@arndb.de> Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
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- 22 3月, 2014 1 次提交
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由 Arnd Bergmann 提交于
Building an SMP kernel for the sunxi platform with THUMB2 instructions fails with this error at the moment: headsmp.S:7: Error: Thumb encoding does not support an immediate here -- `msr cpsr_fsxc,#0xd3' Since the generic secondary_startup function already does the same thing in a safe way, we can just drop the private sunxi implementation and jump straight to secondary_startup. Signed-off-by: NArnd Bergmann <arnd@arndb.de> Cc: Maxime Ripard <maxime.ripard@free-electrons.com>
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- 12 2月, 2014 1 次提交
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由 Stephen Boyd 提交于
The goal of multi-platform kernels is to remove the need for mach directories and machine descriptors. To further that goal, introduce CPU_METHOD_OF_DECLARE() to allow cpu hotplug/smp support to be separated from the machine descriptors. Implementers should specify an enable-method property in their cpus node and then implement a matching set of smp_ops in their hotplug/smp code, wiring it up with the CPU_METHOD_OF_DECLARE() macro. When the kernel is compiled we'll collect all the enable-method smp_ops into one section for use at boot. At boot time we'll look for an enable-method in each cpu node and try to match that against all known CPU enable methods in the kernel. If there are no enable-methods in the cpu nodes we fallback to the cpus node and try to use any enable-method found there. If that doesn't work we fall back to the old way of using the machine descriptor. Acked-by: NMark Rutland <mark.rutland@arm.com> Cc: Russell King <linux@arm.linux.org.uk> Cc: <devicetree@vger.kernel.org> Signed-off-by: NStephen Boyd <sboyd@codeaurora.org> Signed-off-by: NKumar Gala <galak@codeaurora.org>
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- 24 9月, 2013 1 次提交
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由 Nicolas Pitre 提交于
We need a mechanism to let an inbound CPU signal that it is alive before even getting into the kernel environment i.e. from early assembly code. Using an IPI is the simplest way to achieve that. This adds some basic infrastructure to register a struct completion pointer to be "completed" when the dedicated IPI for this task is received. Signed-off-by: NNicolas Pitre <nico@linaro.org>
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- 08 6月, 2013 1 次提交
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由 Jonathan Austin 提交于
The MPU initialisation on the primary core is performed in two stages, one minimal stage to ensure the CPU can boot and a second one after sanity_check_meminfo. As the memory configuration is known by the time we boot secondary cores only a single step is necessary, provided the values for DRSR are passed to secondaries. This patch implements this arrangement. The configuration generated for the MPU regions is made available to the secondary core, which can then use the asm MPU intialisation code to program a complete region configuration. This is necessary for SMP configurations without an MMU, as the MPU initialisation is the only way to ensure that memory is specified as 'shared'. Signed-off-by: NJonathan Austin <jonathan.austin@arm.com> Reviewed-by: NWill Deacon <will.deacon@arm.com> CC: Nicolas Pitre <nico@linaro.org>
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- 13 11月, 2012 1 次提交
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由 Shawn Guo 提交于
Add function arch_send_wakeup_ipi_mask(), so that platform code can use it as an easy way to wake up cores that are in WFI. Signed-off-by: NShawn Guo <shawn.guo@linaro.org> Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
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- 14 9月, 2012 2 次提交
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由 Marc Zyngier 提交于
Almost each SMP platform defines pen_release to manage booting secondary CPUs. This of course clashes with the single zImage effort. Add the pen_release definition to the ARM SMP code, and remove all others. This should only be used by platforms which lack any kind of CPU power management... Reported-by: NArnd Bergmann <arnd@arndb.de> Signed-off-by: NMarc Zyngier <marc.zyngier@arm.com> Acked-by: NNicolas Pitre <nico@linaro.org> Signed-off-by: NArnd Bergmann <arnd@arndb.de>
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由 Marc Zyngier 提交于
Now that all SMP platforms have been converted to use struct smp_operations, remove the "weak" attribute from the hooks in smp.c, and make the functions static wherever possible. Signed-off-by: NMarc Zyngier <marc.zyngier@arm.com> Acked-by: NNicolas Pitre <nico@linaro.org> Signed-off-by: NArnd Bergmann <arnd@arndb.de>
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- 13 9月, 2012 1 次提交
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由 Marc Zyngier 提交于
This adds a 'struct smp_operations' to abstract the CPU initialization and hot plugging functions on SMP systems, which otherwise conflict in a multiplatform kernel. This also helps shmobile and potentially others that have more than one method to do these. To allow the kernel to continue building, the platform hooks are defined as weak symbols which are overrided by the platform code. Once all platforms are converted, the "weak" attribute will be removed and the function made static. Unlike the original version from Marc, this new version from Arnd does not use a generalized abstraction for per-soc data structures but only tries to solve the problem for the SMP operations. This way, we can collapse the previous four data structures into a single struct, which is less systematic but also easier to follow as a causal reader. Signed-off-by: NMarc Zyngier <marc.zyngier@arm.com> Acked-by: NNicolas Pitre <nico@fluxnic.net> Signed-off-by: NArnd Bergmann <arnd@arndb.de>
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- 23 1月, 2012 1 次提交
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由 Will Deacon 提交于
It turns out that the logical CPU mapping is useful even when !CONFIG_SMP for manipulation of devices like interrupt and power controllers when running a UP kernel on a CPU other than 0. This can happen when kexecing a UP image from an SMP kernel. In the future, multi-cluster systems running AMP configurations will require something similar for mapping cluster IDs, so it makes sense to decouple this logic in preparation for this support. Acked-by: NYang Bai <hamo.by@gmail.com> Acked-by: NMarc Zyngier <marc.zyngier@arm.com> Reported-by: NJoerg Roedel <joerg.roedel@amd.com> Signed-off-by: NWill Deacon <will.deacon@arm.com> Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
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- 23 10月, 2011 1 次提交
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由 Marc Zyngier 提交于
PPI handling is a bit of an odd beast. It uses its own low level handling code and is hardwired to the local timers (hence lacking a registration interface). Instead, switch the low handling to the normal SPI handling code. PPIs are handled by the handle_percpu_devid_irq flow. This also allows the removal of some duplicated code. Cc: Kukjin Kim <kgene.kim@samsung.com> Cc: David Brown <davidb@codeaurora.org> Cc: Bryan Huntsman <bryanh@codeaurora.org> Cc: Tony Lindgren <tony@atomide.com> Cc: Paul Mundt <lethal@linux-sh.org> Cc: Magnus Damm <magnus.damm@gmail.com> Cc: Thomas Gleixner <tglx@linutronix.de> Acked-by: NDavid Brown <davidb@codeaurora.org> Tested-by: NDavid Brown <davidb@codeaurora.org> Tested-by: NShawn Guo <shawn.guo@linaro.org> Signed-off-by: NMarc Zyngier <marc.zyngier@arm.com>
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- 17 10月, 2011 2 次提交
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由 Shawn Guo 提交于
In order to be able to handle IPI directly from C code instead of assembly code, introduce handle_IPI(), which is modeled after handle_IRQ(). Signed-off-by: NMarc Zyngier <marc.zyngier@arm.com> Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
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由 Will Deacon 提交于
To allow booting Linux on a CPU with physical ID != 0, we need to provide a mapping from the logical CPU number to the physical CPU number. This patch adds such a mapping and populates it during boot. Signed-off-by: NWill Deacon <will.deacon@arm.com> Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
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- 26 5月, 2011 1 次提交
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由 Catalin Marinas 提交于
This patch makes TTBR1 point to swapper_pg_dir so that global, kernel mappings can be used exclusively on v6 and v7 cores where they are needed. Signed-off-by: NCatalin Marinas <catalin.marinas@arm.com> Signed-off-by: NWill Deacon <will.deacon@arm.com> Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
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- 25 5月, 2011 1 次提交
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由 Stephen Boyd 提交于
This constant hasn't been used since before the git era (2.6.12) and thus can be dropped. Signed-off-by: NStephen Boyd <sboyd@codeaurora.org> Cc: Russell King <rmk@arm.linux.org.uk> Cc: Richard Weinberger <richard@nod.at> Cc: Hirokazu Takata <takata@linux-m32r.org> Cc: Kyle McMartin <kyle@mcmartin.ca> Cc: Richard Henderson <rth@twiddle.net> Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru> Cc: Matt Turner <mattst88@gmail.com> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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- 23 5月, 2011 1 次提交
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由 Russell King 提交于
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: NRussell King <rmk+kernel@arm.linux.org.uk>
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- 20 12月, 2010 2 次提交
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由 Russell King 提交于
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: NRussell King <rmk+kernel@arm.linux.org.uk>
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由 Russell King 提交于
As per x86, align the initial column according to how many IRQs we have. Also, provide an english explaination for the 'LOC:' and 'IPI:' lines. Reviewed-by: NCatalin Marinas <catalin.marinas@arm.com> Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
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- 03 12月, 2010 1 次提交
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由 Russell King 提交于
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: NCatalin Marinas <catalin.marinas@arm.com> Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
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- 15 5月, 2010 1 次提交
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由 Russell King 提交于
Consistently name all SMP platform related functions. Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
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- 24 9月, 2009 1 次提交
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由 Rusty Russell 提交于
Now everyone is converted to arch_send_call_function_ipi_mask, remove the shim and the #defines. Signed-off-by: NRusty Russell <rusty@rustcorp.com.au>
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- 28 5月, 2009 1 次提交
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由 Russell King 提交于
Convert cpu_*_mask bit twiddling to the new set_cpu_*() API. Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
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- 18 5月, 2009 1 次提交
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由 Russell King 提交于
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
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- 17 5月, 2009 1 次提交
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由 Russell King 提交于
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: NRussell King <rmk+kernel@arm.linux.org.uk>
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- 01 12月, 2008 1 次提交
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由 Catalin Marinas 提交于
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: NCatalin Marinas <catalin.marinas@arm.com>
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- 07 8月, 2008 1 次提交
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由 Russell King 提交于
This just leaves include/asm-arm/plat-* to deal with. Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
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- 03 8月, 2008 1 次提交
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由 Russell King 提交于
Move platform independent header files to arch/arm/include/asm, leaving those in asm/arch* and asm/plat* alone. Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
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- 26 6月, 2008 1 次提交
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由 Jens Axboe 提交于
This converts arm to use the new helpers for smp_call_function() and friends, and adds support for smp_call_function_single(). Fixups and testing done by Catalin Marinas <catalin.marinas@arm.com> Cc: Russell King <rmk@arm.linux.org.uk> Signed-off-by: NJens Axboe <jens.axboe@oracle.com>
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- 05 2月, 2008 2 次提交
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由 Catalin Marinas 提交于
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: NCatalin Marinas <catalin.marinas@arm.com> Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
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由 Catalin Marinas 提交于
This patch adds the smp_call_function_single and smp_timer_broadcast functions and modifies ipi_timer to call the platform-specific function local_timer_interrupt. Signed-off-by: NCatalin Marinas <catalin.marinas@arm.com> Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
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- 26 4月, 2006 1 次提交
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由 David Woodhouse 提交于
Signed-off-by: NDavid Woodhouse <dwmw2@infradead.org>
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- 16 2月, 2006 1 次提交
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由 Russell King 提交于
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: NRussell King <rmk+kernel@arm.linux.org.uk>
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- 09 11月, 2005 1 次提交
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由 Russell King 提交于
Add infrastructure for supporting per-cpu local timers to update the profiling information and update system time accounting. Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
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