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* PM: Split up sysdev_[suspend|resume] from device_power_[down|up]Rafael J. Wysocki2009-02-22
| | | | | | | | | | | Move the sysdev_suspend/resume from the callee to the callers, with no real change in semantics, so that we can rework the disabling of interrupts during suspend/hibernation. This is based on an earlier patch from Linus. Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* xen: make sysfs files behave as their names suggestJeremy Fitzhardinge2009-01-29
| | | | | | | | | | | | | | | 1: make "target_kb" only accept and produce a memory size in kilobytes. 2: add a second "target" file which produces output in bytes, and will accept memparse input (scaled bytes) This fixes the rather irritating problem that writing the same value read back into target_kb would end up shrinking the domain by a factor of 1024, with generally bad results. Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Cc: Stable Kernel <stable@kernel.org> Cc: "dan.magenheimer@oracle.com" <dan.magenheimer@oracle.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* xen: unitialised return value in xenbus_write_transactionIan Campbell2009-01-26
| | | | | | | | The return value of xenbus_write_transaction can be uninitialised in the success case leading to the userspace xenstore utilities failing. Signed-off-by: Ian Campbell <ian.campbell@citrix.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* xen: handle highmem pages correctly when shrinking a domainIan Campbell2009-01-23
| | | | | | | | | | | | Commit 1058a75f07b9bb8323fb5197be5526220f8b75cf ("xen: actually release memory when shrinking domain") causes a crash if the page being released is a highmem page. If a page is highmem then there is no need to unmap it. Signed-off-by: Ian Campbell <ian.campbell@citrix.com> Acked-by: Jeremy Fitzhardinge <jeremy@goop.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* xen: actually release memory when shrinking domainDan Magenheimer2009-01-22
| | | | | | | | | | | | | | | Fix this: > It appears that in the upstream balloon driver, > the call to HYPERVISOR_update_va_mapping is missing > from decrease_reservation. I think as a result, > the balloon driver is eating memory but not > releasing it to Xen, thus rendering the balloon > driver essentially useless. (Can be observed via xentop.) Signed-off-by: Dan Magenheimer <dan.magenheimer@oracle.com> Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* xen: add xenfs to allow usermode <-> Xen interactionAlex Zeffertt2009-01-08
| | | | | | | | | | | | | | | The xenfs filesystem exports various interfaces to usermode. Initially this exports a file to allow usermode to interact with xenbus/xenstore. Traditionally this appeared in /proc/xen. Rather than extending procfs, this patch adds a backward-compat mountpoint on /proc/xen, and provides a xenfs filesystem which can be mounted there. Signed-off-by: Alex Zeffertt <alex.zeffertt@eu.citrix.com> Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Cc: Ingo Molnar <mingo@elte.hu> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* drivers/xen/xenbus/xenbus_client.c: cleanup kerneldocQinghuang Feng2009-01-08
| | | | | | | | | | no argument named @xbt in xenbus_switch_state(), remove it. Signed-off-by: Qinghuang Feng <qhfeng.kernel@gmail.com> Cc: Randy Dunlap <randy.dunlap@oracle.com> Cc: Jeremy Fitzhardinge <jeremy@goop.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* xen: struct device - replace bus_id with dev_name(), dev_set_name()Kay Sievers2009-01-06
| | | | | | CC: Jeremy Fitzhardinge <jeremy@goop.org> Signed-off-by: Kay Sievers <kay.sievers@vrfy.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
* Merge branch 'cpus4096-for-linus-2' of ↵Linus Torvalds2009-01-02
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip * 'cpus4096-for-linus-2' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: (66 commits) x86: export vector_used_by_percpu_irq x86: use logical apicid in x2apic_cluster's x2apic_cpu_mask_to_apicid_and() sched: nominate preferred wakeup cpu, fix x86: fix lguest used_vectors breakage, -v2 x86: fix warning in arch/x86/kernel/io_apic.c sched: fix warning in kernel/sched.c sched: move test_sd_parent() to an SMP section of sched.h sched: add SD_BALANCE_NEWIDLE at MC and CPU level for sched_mc>0 sched: activate active load balancing in new idle cpus sched: bias task wakeups to preferred semi-idle packages sched: nominate preferred wakeup cpu sched: favour lower logical cpu number for sched_mc balance sched: framework for sched_mc/smt_power_savings=N sched: convert BALANCE_FOR_xx_POWER to inline functions x86: use possible_cpus=NUM to extend the possible cpus allowed x86: fix cpu_mask_to_apicid_and to include cpu_online_mask x86: update io_apic.c to the new cpumask code x86: Introduce topology_core_cpumask()/topology_thread_cpumask() x86: xen: use smp_call_function_many() x86: use work_on_cpu in x86/kernel/cpu/mcheck/mce_amd_64.c ... Fixed up trivial conflict in kernel/time/tick-sched.c manually
| * Merge ../linux-2.6-x86Rusty Russell2008-12-13
| |\ | | | | | | | | | | | | | | | | | | | | | Conflicts: arch/x86/kernel/io_apic.c kernel/sched.c kernel/sched_stats.h
| * | cpumask: make irq_set_affinity() take a const struct cpumaskRusty Russell2008-12-13
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Impact: change existing irq_chip API Not much point with gentle transition here: the struct irq_chip's setaffinity method signature needs to change. Fortunately, not widely used code, but hits a few architectures. Note: In irq_select_affinity() I save a temporary in by mangling irq_desc[irq].affinity directly. Ingo, does this break anything? (Folded in fix from KOSAKI Motohiro) Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Signed-off-by: Mike Travis <travis@sgi.com> Reviewed-by: Grant Grundler <grundler@parisc-linux.org> Acked-by: Ingo Molnar <mingo@redhat.com> Cc: ralf@linux-mips.org Cc: grundler@parisc-linux.org Cc: jeremy@xensource.com Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
* | | Merge branch 'irq-fixes-for-linus-4' of ↵Linus Torvalds2008-12-31
|\ \ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip * 'irq-fixes-for-linus-4' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: sparseirq: move __weak symbols into separate compilation unit sparseirq: work around __weak alias bug sparseirq: fix hang with !SPARSE_IRQ sparseirq: set lock_class for legacy irq when sparse_irq is selected sparseirq: work around compiler optimizing away __weak functions sparseirq: fix desc->lock init sparseirq: do not printk when migrating IRQ descriptors sparseirq: remove duplicated arch_early_irq_init() irq: simplify for_each_irq_desc() usage proc: remove ifdef CONFIG_SPARSE_IRQ from stat.c irq: for_each_irq_desc() move to irqnr.h hrtimer: remove #include <linux/irq.h>
| * | | irq: simplify for_each_irq_desc() usageKOSAKI Motohiro2008-12-26
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Impact: cleanup all for_each_irq_desc() usage point have !desc check. then its check can move into for_each_irq_desc() macro. Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Acked-by: Yinghai Lu <yinghai@kernel.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* | | | Merge branch 'irq-core-for-linus' of ↵Linus Torvalds2008-12-30
|\| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip * 'irq-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: x86, sparseirq: clean up Kconfig entry x86: turn CONFIG_SPARSE_IRQ off by default sparseirq: fix numa_migrate_irq_desc dependency and comments sparseirq: add kernel-doc notation for new member in irq_desc, -v2 locking, irq: enclose irq_desc_lock_class in CONFIG_LOCKDEP sparseirq, xen: make sure irq_desc is allocated for interrupts sparseirq: fix !SMP building, #2 x86, sparseirq: move irq_desc according to smp_affinity, v7 proc: enclose desc variable of show_stat() in CONFIG_SPARSE_IRQ sparse irqs: add irqnr.h to the user headers list sparse irqs: handle !GENIRQ platforms sparseirq: fix !SMP && !PCI_MSI && !HT_IRQ build sparseirq: fix Alpha build failure sparseirq: fix typo in !CONFIG_IO_APIC case x86, MSI: pass irq_cfg and irq_desc x86: MSI start irq numbering from nr_irqs_gsi x86: use NR_IRQS_LEGACY sparse irq_desc[] array: core kernel and x86 changes genirq: record IRQ_LEVEL in irq_desc[] irq.h: remove padding from irq_desc on 64bits
| * | | sparseirq, xen: make sure irq_desc is allocated for interruptsJeremy Fitzhardinge2008-12-18
| | |/ | |/| | | | | | | | | | | | | | | | | | | | | | Impact: fix crash Make sure all Xen irqs have an irq_desc. Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
| * | sparse irq_desc[] array: core kernel and x86 changesYinghai Lu2008-12-08
| |/ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Impact: new feature Problem on distro kernels: irq_desc[NR_IRQS] takes megabytes of RAM with NR_CPUS set to large values. The goal is to be able to scale up to much larger NR_IRQS value without impacting the (important) common case. To solve this, we generalize irq_desc[NR_IRQS] to an (optional) array of irq_desc pointers. When CONFIG_SPARSE_IRQ=y is used, we use kzalloc_node to get irq_desc, this also makes the IRQ descriptors NUMA-local (to the site that calls request_irq()). This gets rid of the irq_cfg[] static array on x86 as well: irq_cfg now uses desc->chip_data for x86 to store irq_cfg. Signed-off-by: Yinghai Lu <yinghai@kernel.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* / xen: clean up asm/xen/hypervisor.hJeremy Fitzhardinge2008-12-16
|/ | | | | | | | | | | Impact: cleanup hypervisor.h had accumulated a lot of crud, including lots of spurious #includes. Clean it all up, and go around fixing up everything else accordingly. Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* xen: fix scrub_page()Jeremy Fitzhardinge2008-11-17
| | | | | | | | | | | | | | | | Impact: fix guest kernel crash with CONFIG_XEN_SCRUB_PAGES=y Jens noticed that scrub_page() has a buggy unmap of the wrong thing. (virtual address instead of page) Linus pointed out that the whole scrub_page() code is an unnecessary reimplementation of clear_highpage() to begin with. Just use clear_highpage() rather than reimplementing it poorly. Reported-by: Jens Axboe <jens.axboe@oracle.com> Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* drivers: remove duplicated #includeJianjun Kong2008-11-04
| | | | | Signed-off-by: Jianjun Kong <jianjun@zeuux.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* xen: compilation fix of drivers/xen/events.c on IA64Isaku Yamahata2008-10-23
| | | | | | | | | | | | | use set_xen_guest_handle() instead of direct assigning. > linux-2.6/drivers/xen/events.c: In function 'xen_poll_irq': > linux-2.6/drivers/xen/events.c:757: error: incompatible types in assignment > make[4]: *** [drivers/xen/events.o] Error 1 Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp> Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Cc: Isaku Yamahata <yamahata@valinux.co.jp> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* xen: portability clean up and some minor clean up for xencomm.cIsaku Yamahata2008-10-23
| | | | | | | | | | | | clean up of xencomm.c. is_phys_contiguous() is arch dependent function that depends on how virtual memory are laid out. So split out the function into arch specific code. Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp> Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Cc: Isaku Yamahata <yamahata@valinux.co.jp> Signed-off-by: Ingo Molnar <mingo@elte.hu> Cc: "Luck, Tony" <tony.luck@intel.com>
* xen: don't reload cr3 on suspendJeremy Fitzhardinge2008-10-23
| | | | | | | | It isn't necessary, and it makes the code needlessly non-portable. Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Cc: Isaku Yamahata <yamahata@valinux.co.jp> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* x86, um: ... and asm-x86 moveAl Viro2008-10-23
| | | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: H. Peter Anvin <hpa@zytor.com>
* genirq: use iterators for irq_desc loopsThomas Gleixner2008-10-16
| | | | | | Use for_each_irq_desc[_reverse] for all the iteration loops. Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* xen: fix memory access violation bug when CONFIG_HAVE_SPARSE_IRQ is enabledAlex Nixon2008-10-16
| | | | | | | | | | When sparse IRQs are enabled, it is not safe to assume an IRQ descriptor exists for every possible IRQ. This patch causes init_evtchn_cpu_bindings to skip initialisation of IRQ descriptors which don't exist. Signed-off-by: Alex Nixon <alex.nixon@citrix.com> Acked-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* generic: sparse irqs: use irq_desc() together with dyn_array, instead of ↵Yinghai Lu2008-10-16
| | | | | | | | | | | | | | | | | | irq_desc[] add CONFIG_HAVE_SPARSE_IRQ to for use condensed array. Get rid of irq_desc[] array assumptions. Preallocate 32 irq_desc, and irq_desc() will try to get more. ( No change in functionality is expected anywhere, except the odd build failure where we missed a code site or where a crossing commit itroduces new irq_desc[] usage. ) v2: according to Eric, change get_irq_desc() to irq_desc() Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* drivers/xen: use nr_irqsYinghai Lu2008-10-16
| | | | | Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* xen: remove unused balloon.hJeremy Fitzhardinge2008-10-03
| | | | | | | | | The balloon driver doesn't have any externally callable functions at the moment, so remove the (effectively empty) header. We can add it back if we need to. Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* Merge branch 'core/xen' into x86/xenIngo Molnar2008-09-10
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| * xen: fix 2.6.27-rc5 xen balloon driver warningsJeremy Fitzhardinge2008-09-08
| | | | | | | | | | | | | | | | Set the class so it doesn't clash with the normal memory class. Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> ===================================================================
| * stop_machine: wean Xen off stop_machine_runRusty Russell2008-08-25
| | | | | | | | | | | | | | This is the last use of (the deprecated) stop_machine_run in the tree. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Acked-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
* | Xen: fix cpu_hotplug build when !CONFIG_SMPAlex Nixon2008-09-05
| | | | | | | | | | | | | | Compile cpu_hotplug.c conditionally on CONFIG_HOTPLUG_CPU Signed-off-by: Alex Nixon <alex.nixon@citrix.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* | Xen: fix cpu_hotplug.c build by replacing is_running_on_xen() with ↵Alex Nixon2008-09-05
| | | | | | | | | | | | | | xen_pv_domain() Signed-off-by: Alex Nixon <alex.nixon@citrix.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* | xen: implement CPU hotpluggingAlex Nixon2008-08-25
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Note the changes from 2.6.18-xen CPU hotplugging: A vcpu_down request from the remote admin via Xenbus both hotunplugs the CPU, and disables it by removing it from the cpu_present map, and removing its entry in /sys. A vcpu_up request from the remote admin only re-enables the CPU, and does not immediately bring the CPU up. A udev event is emitted, which can be caught by the user if he wishes to automatically re-up CPUs when available, or implement a more complex policy. Signed-off-by: Alex Nixon <alex.nixon@citrix.com> Acked-by: Jeremy Fitzhardinge <jeremy@goop.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* | xen: save previous spinlock when blockingJeremy Fitzhardinge2008-08-21
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | A spinlock can be interrupted while spinning, so make sure we preserve the previous lock of interest if we're taking a lock from within an interrupt handler. We also need to deal with the case where the blocking path gets interrupted between testing to see if the lock is free and actually blocking. If we get interrupted there and end up in the state where the lock is free but the irq isn't pending, then we'll block indefinitely in the hypervisor. This fix is to make sure that any nested lock-takers will always leave the irq pending if there's any chance the outer lock became free. Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Acked-by: Jan Beulich <jbeulich@novell.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* | xen: clean up domain mode predicatesJeremy Fitzhardinge2008-08-20
| | | | | | | | | | | | | | | | | | | | | | | | | | | | There are four operating modes Xen code may find itself running in: - native - hvm domain - pv dom0 - pv domU Clean up predicates for testing for these states to make them more consistent. Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Cc: Xen-devel <xen-devel@lists.xensource.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* | xen: compile irq functions without -pg for ftraceJeremy Fitzhardinge2008-07-31
| | | | | | | | | | | | | | | | | | | | | | | | | | For some reason I managed to miss a bunch of irq-related functions which also need to be compiled without -pg when using ftrace. This patch moves them into their own file, and starts a cleanup process I've been meaning to do anyway. Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Cc: Sam Ravnborg <sam@ravnborg.org> Cc: "Alex Nixon (Intern)" <Alex.Nixon@eu.citrix.com> Cc: Eduardo Habkost <ehabkost@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* | xen-balloon: clean up unused functionsJeremy Fitzhardinge2008-07-28
| | | | | | | | | | | | | | | | | | | | | | | | | | | | Remove some unused functions: balloon_update_driver_allowance balloon_release_driver_page only used on the (obsolete, removed) flip path in netfront alloc_empty_pages_and_pagevec free_empty_pages_and_pagevec only used in backend drivers; can be reintroduced when needed Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* | xen-balloon: fix up sysfs issuesJeremy Fitzhardinge2008-07-28
|/ | | | | | | | | | | 1. Set the class so it doesn't clash with the normal memory class 2. Fix up the sysfs show functions to match the new prototype 3. Clean up use of memparse Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Cc: "viets@work.de" <viets@work.de> Cc: Andi Kleen <andi@firstfloor.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* sysdev: Pass the attribute to the low level sysdev show/store functionAndi Kleen2008-07-22
| | | | | | | | | | | | | | | | | | | | | | This allow to dynamically generate attributes and share show/store functions between attributes. Right now most attributes are generated by special macros and lots of duplicated code. With the attribute passed it's instead possible to attach some data to the attribute and then use that in shared low level functions to do different things. I need this for the dynamically generated bank attributes in the x86 machine check code, but it'll allow some further cleanups. I converted all users in tree to the new show/store prototype. It's a single huge patch to avoid unbisectable sections. Runtime tested: x86-32, x86-64 Compiled only: ia64, powerpc Not compile tested/only grep converted: sh, arm, avr32 Signed-off-by: Andi Kleen <ak@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
* Merge branch 'x86/paravirt-spinlocks' into x86/for-linusIngo Molnar2008-07-21
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| * xen: implement Xen-specific spinlocksJeremy Fitzhardinge2008-07-16
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The standard ticket spinlocks are very expensive in a virtual environment, because their performance depends on Xen's scheduler giving vcpus time in the order that they're supposed to take the spinlock. This implements a Xen-specific spinlock, which should be much more efficient. The fast-path is essentially the old Linux-x86 locks, using a single lock byte. The locker decrements the byte; if the result is 0, then they have the lock. If the lock is negative, then locker must spin until the lock is positive again. When there's contention, the locker spin for 2^16[*] iterations waiting to get the lock. If it fails to get the lock in that time, it adds itself to the contention count in the lock and blocks on a per-cpu event channel. When unlocking the spinlock, the locker looks to see if there's anyone blocked waiting for the lock by checking for a non-zero waiter count. If there's a waiter, it traverses the per-cpu "lock_spinners" variable, which contains which lock each CPU is waiting on. It picks one CPU waiting on the lock and sends it an event to wake it up. This allows efficient fast-path spinlock operation, while allowing spinning vcpus to give up their processor time while waiting for a contended lock. [*] 2^16 iterations is threshold at which 98% locks have been taken according to Thomas Friebel's Xen Summit talk "Preventing Guests from Spinning Around". Therefore, we'd expect the lock and unlock slow paths will only be entered 2% of the time. Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Cc: Jens Axboe <axboe@kernel.dk> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Christoph Lameter <clameter@linux-foundation.org> Cc: Petr Tesarik <ptesarik@suse.cz> Cc: Virtualization <virtualization@lists.linux-foundation.org> Cc: Xen devel <xen-devel@lists.xensource.com> Cc: Thomas Friebel <thomas.friebel@amd.com> Cc: Nick Piggin <nickpiggin@yahoo.com.au> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* | linux-next: pci tree build failureStephen Rothwell2008-07-18
|/ | | | | | | | | | | | | | | | | | | Today's linux-next build (x86_64 allmodconfig) failed like this: drivers/xen/manage.c: In function 'xen_suspend': drivers/xen/manage.c:66: error: too few arguments to function 'device_power_up' drivers/xen/manage.c: In function 'do_suspend': drivers/xen/manage.c:117: error: too few arguments to function 'device_resume' Caused by commit 1eede070a59e1cc73da51e1aaa00d9ab86572cfc ("Introduce new top level suspend and hibernation callbacks") interacting with new usages ... Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au> Cc: Jeremy Fitzhardinge <jeremy@goop.org> Acked-by: Rafael J. Wysocki <rjw@sisk.pl> Cc: Jesse Barnes <jbarnes@virtuousgeek.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* xen: add xen_arch_resume()/xen_timer_resume hook for ia64 supportIsaku Yamahata2008-07-16
| | | | | | | | | | | | | | | | | | | | | | | | | | | add xen_timer_resume() hook. Timer resume should be done after event channel is resumed. add xen_arch_resume() hook when ipi becomes usable after resume. After resume, some cpu specific resource must be reinitialized on ia64 that can't be set by another cpu. However available hooks is run once on only one cpu so that ipi has to be used. During stop_machine_run() ipi can't be used because interrupt is masked. So add another hook after stop_machine_run(). Another approach might be use resume hook which is run by device_resume(). However device_resume() may be executed on suspend error recovery path. So it is necessary to determine whether it is executed on real resume path or error recovery path. Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp> Cc: Stephen Tweedie <sct@redhat.com> Cc: Eduardo Habkost <ehabkost@redhat.com> Cc: Mark McLoughlin <markmc@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* Merge branch 'x86/for-linus' of ↵Linus Torvalds2008-07-14
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip * 'x86/for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: (821 commits) x86: make 64bit hpet_set_mapping to use ioremap too, v2 x86: get x86_phys_bits early x86: max_low_pfn_mapped fix #4 x86: change _node_to_cpumask_ptr to return const ptr x86: I/O APIC: remove an IRQ2-mask hack x86: fix numaq_tsc_disable calling x86, e820: remove end_user_pfn x86: max_low_pfn_mapped fix, #3 x86: max_low_pfn_mapped fix, #2 x86: max_low_pfn_mapped fix, #1 x86_64: fix delayed signals x86: remove conflicting nx6325 and nx6125 quirks x86: Recover timer_ack lost in the merge of the NMI watchdog x86: I/O APIC: Never configure IRQ2 x86: L-APIC: Always fully configure IRQ0 x86: L-APIC: Set IRQ0 as edge-triggered x86: merge dwarf2 headers x86: use AS_CFI instead of UNWIND_INFO x86: use ignore macro instead of hash comment x86: use matching CFI_ENDPROC ...
| * xen: Use wmb instead of rmb in xen_evtchn_do_upcall().Isaku Yamahata2008-06-20
| | | | | | | | | | | | | | | | | | | | | | | | | | This patch is ported one from 534:77db69c38249 of linux-2.6.18-xen.hg. Use wmb instead of rmb to enforce ordering between evtchn_upcall_pending and evtchn_pending_sel stores in xen_evtchn_do_upcall(). Cc: Samuel Thibault <samuel.thibault@eu.citrix.com> Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp> Cc: Nick Piggin <nickpiggin@yahoo.com.au> Cc: the arch/x86 maintainers <x86@kernel.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
| * CONFIG_PM_SLEEP fix: xen: fix compilation when CONFIG_PM_SLEEP is disabledJeremy Fitzhardinge2008-06-02
| | | | | | | | | | | | | | | | Xen save/restore depends on CONFIG_PM_SLEEP being set for device_power_up/down. Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Acked-by: Randy Dunlap <randy.dunlap@oracle.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
| * xen: maintain clock offset over save/restoreJeremy Fitzhardinge2008-05-27
| | | | | | | | | | | | | | | | | | | | Hook into the device model to make sure that timekeeping's resume handler is called. This deals with our clocksource's non-monotonicity over the save/restore. Explicitly call clock_has_changed() to make sure that all the timers get retriggered properly. Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
| * xen: implement save/restoreJeremy Fitzhardinge2008-05-27
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch implements Xen save/restore and migration. Saving is triggered via xenbus, which is polled in drivers/xen/manage.c. When a suspend request comes in, the kernel prepares itself for saving by: 1 - Freeze all processes. This is primarily to prevent any partially-completed pagetable updates from confusing the suspend process. If CONFIG_PREEMPT isn't defined, then this isn't necessary. 2 - Suspend xenbus and other devices 3 - Stop_machine, to make sure all the other vcpus are quiescent. The Xen tools require the domain to run its save off vcpu0. 4 - Within the stop_machine state, it pins any unpinned pgds (under construction or destruction), performs canonicalizes various other pieces of state (mostly converting mfns to pfns), and finally 5 - Suspend the domain Restore reverses the steps used to save the domain, ending when all the frozen processes are thawed. Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
| * xenbus: rebind irq on restoreJeremy Fitzhardinge2008-05-27
| | | | | | | | | | | | | | | | | | | | When restoring, rebind the existing xenbus irq to the new xenbus event channel. (It turns out in practice that this is always the same, and is never updated on restore. That's a bug, but Xeno-linux has been like this for a long time, so it can't really be fixed.) Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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