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https://github.com/xen-project/xen.git
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Keir Fraser
c65b3f8832
Make the drivers build properly in a 2.6.27 environment as well as against a kernel with pv-ops Xen configured on (in the latter case more work would be needed to also make the drivers work, as there's a large number of duplicate exports). Portions from Charles Arnold <carnold@novell.com>. Signed-off-by: Jan Beulich <jbeulich@novell.com>
115 lines
2.1 KiB
C
115 lines
2.1 KiB
C
#include <linux/cpumask.h>
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#include <linux/preempt.h>
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#include <xen/evtchn.h>
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#include <xen/gnttab.h>
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#include <xen/xenbus.h>
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#include "platform-pci.h"
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#include <asm/hypervisor.h>
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struct ap_suspend_info {
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int do_spin;
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atomic_t nr_spinning;
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};
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#ifdef CONFIG_SMP
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/*
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* Spinning prevents, for example, APs touching grant table entries while
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* the shared grant table is not mapped into the address space imemdiately
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* after resume.
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*/
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static void ap_suspend(void *_info)
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{
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struct ap_suspend_info *info = _info;
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BUG_ON(!irqs_disabled());
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atomic_inc(&info->nr_spinning);
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mb();
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while (info->do_spin)
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cpu_relax();
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mb();
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atomic_dec(&info->nr_spinning);
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}
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#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,27)
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#define initiate_ap_suspend(i) smp_call_function(ap_suspend, i, 0, 0)
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#else
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#define initiate_ap_suspend(i) smp_call_function(ap_suspend, i, 0)
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#endif
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#else /* !defined(CONFIG_SMP) */
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#define initiate_ap_suspend(i) 0
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#endif
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static int bp_suspend(void)
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{
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int suspend_cancelled;
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BUG_ON(!irqs_disabled());
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suspend_cancelled = HYPERVISOR_suspend(0);
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if (!suspend_cancelled) {
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platform_pci_resume();
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gnttab_resume();
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irq_resume();
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}
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return suspend_cancelled;
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}
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int __xen_suspend(int fast_suspend, void (*resume_notifier)(int))
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{
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int err, suspend_cancelled, nr_cpus;
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struct ap_suspend_info info;
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xenbus_suspend();
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preempt_disable();
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/* Prevent any races with evtchn_interrupt() handler. */
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disable_irq(xen_platform_pdev->irq);
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info.do_spin = 1;
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atomic_set(&info.nr_spinning, 0);
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smp_mb();
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nr_cpus = num_online_cpus() - 1;
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err = initiate_ap_suspend(&info);
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if (err < 0) {
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preempt_enable();
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xenbus_suspend_cancel();
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return err;
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}
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while (atomic_read(&info.nr_spinning) != nr_cpus)
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cpu_relax();
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local_irq_disable();
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suspend_cancelled = bp_suspend();
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resume_notifier(suspend_cancelled);
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local_irq_enable();
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smp_mb();
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info.do_spin = 0;
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while (atomic_read(&info.nr_spinning) != 0)
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cpu_relax();
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enable_irq(xen_platform_pdev->irq);
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preempt_enable();
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if (!suspend_cancelled)
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xenbus_resume();
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else
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xenbus_suspend_cancel();
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return 0;
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}
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