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yaml --- r: 113236 b: refs/heads/master c: 0d1edf4 h: refs/heads/master v: v3
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Jeremy Fitzhardinge
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Ingo Molnar
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Jul 31, 2008
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,2 +1,2 @@ | ||
| --- | ||
| refs/heads/master: eac4345be6d17541039791f15f173d0426423df1 | ||
| refs/heads/master: 0d1edf46ba229b46efacf75c0544b88c05a7b266 |
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,143 @@ | ||
| #include <linux/hardirq.h> | ||
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| #include <xen/interface/xen.h> | ||
| #include <xen/interface/sched.h> | ||
| #include <xen/interface/vcpu.h> | ||
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| #include <asm/xen/hypercall.h> | ||
| #include <asm/xen/hypervisor.h> | ||
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| #include "xen-ops.h" | ||
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| /* | ||
| * Force a proper event-channel callback from Xen after clearing the | ||
| * callback mask. We do this in a very simple manner, by making a call | ||
| * down into Xen. The pending flag will be checked by Xen on return. | ||
| */ | ||
| void xen_force_evtchn_callback(void) | ||
| { | ||
| (void)HYPERVISOR_xen_version(0, NULL); | ||
| } | ||
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| static void __init __xen_init_IRQ(void) | ||
| { | ||
| #ifdef CONFIG_X86_64 | ||
| int i; | ||
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| /* Create identity vector->irq map */ | ||
| for(i = 0; i < NR_VECTORS; i++) { | ||
| int cpu; | ||
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| for_each_possible_cpu(cpu) | ||
| per_cpu(vector_irq, cpu)[i] = i; | ||
| } | ||
| #endif /* CONFIG_X86_64 */ | ||
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| xen_init_IRQ(); | ||
| } | ||
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| static unsigned long xen_save_fl(void) | ||
| { | ||
| struct vcpu_info *vcpu; | ||
| unsigned long flags; | ||
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| vcpu = x86_read_percpu(xen_vcpu); | ||
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| /* flag has opposite sense of mask */ | ||
| flags = !vcpu->evtchn_upcall_mask; | ||
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| /* convert to IF type flag | ||
| -0 -> 0x00000000 | ||
| -1 -> 0xffffffff | ||
| */ | ||
| return (-flags) & X86_EFLAGS_IF; | ||
| } | ||
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| static void xen_restore_fl(unsigned long flags) | ||
| { | ||
| struct vcpu_info *vcpu; | ||
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| /* convert from IF type flag */ | ||
| flags = !(flags & X86_EFLAGS_IF); | ||
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| /* There's a one instruction preempt window here. We need to | ||
| make sure we're don't switch CPUs between getting the vcpu | ||
| pointer and updating the mask. */ | ||
| preempt_disable(); | ||
| vcpu = x86_read_percpu(xen_vcpu); | ||
| vcpu->evtchn_upcall_mask = flags; | ||
| preempt_enable_no_resched(); | ||
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| /* Doesn't matter if we get preempted here, because any | ||
| pending event will get dealt with anyway. */ | ||
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| if (flags == 0) { | ||
| preempt_check_resched(); | ||
| barrier(); /* unmask then check (avoid races) */ | ||
| if (unlikely(vcpu->evtchn_upcall_pending)) | ||
| xen_force_evtchn_callback(); | ||
| } | ||
| } | ||
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| static void xen_irq_disable(void) | ||
| { | ||
| /* There's a one instruction preempt window here. We need to | ||
| make sure we're don't switch CPUs between getting the vcpu | ||
| pointer and updating the mask. */ | ||
| preempt_disable(); | ||
| x86_read_percpu(xen_vcpu)->evtchn_upcall_mask = 1; | ||
| preempt_enable_no_resched(); | ||
| } | ||
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| static void xen_irq_enable(void) | ||
| { | ||
| struct vcpu_info *vcpu; | ||
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| /* We don't need to worry about being preempted here, since | ||
| either a) interrupts are disabled, so no preemption, or b) | ||
| the caller is confused and is trying to re-enable interrupts | ||
| on an indeterminate processor. */ | ||
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| vcpu = x86_read_percpu(xen_vcpu); | ||
| vcpu->evtchn_upcall_mask = 0; | ||
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| /* Doesn't matter if we get preempted here, because any | ||
| pending event will get dealt with anyway. */ | ||
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| barrier(); /* unmask then check (avoid races) */ | ||
| if (unlikely(vcpu->evtchn_upcall_pending)) | ||
| xen_force_evtchn_callback(); | ||
| } | ||
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| static void xen_safe_halt(void) | ||
| { | ||
| /* Blocking includes an implicit local_irq_enable(). */ | ||
| if (HYPERVISOR_sched_op(SCHEDOP_block, NULL) != 0) | ||
| BUG(); | ||
| } | ||
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| static void xen_halt(void) | ||
| { | ||
| if (irqs_disabled()) | ||
| HYPERVISOR_vcpu_op(VCPUOP_down, smp_processor_id(), NULL); | ||
| else | ||
| xen_safe_halt(); | ||
| } | ||
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| static const struct pv_irq_ops xen_irq_ops __initdata = { | ||
| .init_IRQ = __xen_init_IRQ, | ||
| .save_fl = xen_save_fl, | ||
| .restore_fl = xen_restore_fl, | ||
| .irq_disable = xen_irq_disable, | ||
| .irq_enable = xen_irq_enable, | ||
| .safe_halt = xen_safe_halt, | ||
| .halt = xen_halt, | ||
| #ifdef CONFIG_X86_64 | ||
| .adjust_exception_frame = xen_adjust_exception_frame, | ||
| #endif | ||
| }; | ||
|
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| void __init xen_init_irq_ops() | ||
| { | ||
| pv_irq_ops = xen_irq_ops; | ||
| } |
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