diff options
Diffstat (limited to 'arch/powerpc')
| -rw-r--r-- | arch/powerpc/kvm/book3s_hv_rm_xics.c | 50 |
1 files changed, 50 insertions, 0 deletions
diff --git a/arch/powerpc/kvm/book3s_hv_rm_xics.c b/arch/powerpc/kvm/book3s_hv_rm_xics.c index 00b9dfde9ac4..554cdfa9aeb3 100644 --- a/arch/powerpc/kvm/book3s_hv_rm_xics.c +++ b/arch/powerpc/kvm/book3s_hv_rm_xics.c @@ -10,6 +10,7 @@ #include <linux/kernel.h> #include <linux/kvm_host.h> #include <linux/err.h> +#include <linux/kernel_stat.h> #include <asm/kvm_book3s.h> #include <asm/kvm_ppc.h> @@ -18,6 +19,7 @@ #include <asm/debug.h> #include <asm/synch.h> #include <asm/cputhreads.h> +#include <asm/pgtable.h> #include <asm/ppc-opcode.h> #include <asm/pnv-pci.h> @@ -734,6 +736,53 @@ static void icp_eoi(struct irq_chip *c, u32 hwirq, u32 xirr) _stwcix(xics_phys + XICS_XIRR, xirr); } +/* + * Increment a per-CPU 32-bit unsigned integer variable. + * Safe to call in real-mode. Handles vmalloc'ed addresses + * + * ToDo: Make this work for any integral type + */ + +static inline void this_cpu_inc_rm(unsigned int __percpu *addr) +{ + unsigned long l; + unsigned int *raddr; + int cpu = smp_processor_id(); + + raddr = per_cpu_ptr(addr, cpu); + l = (unsigned long)raddr; + + if (REGION_ID(l) == VMALLOC_REGION_ID) { + l = vmalloc_to_phys(raddr); + raddr = (unsigned int *)l; + } + ++*raddr; +} + +/* + * We don't try to update the flags in the irq_desc 'istate' field in + * here as would happen in the normal IRQ handling path for several reasons: + * - state flags represent internal IRQ state and are not expected to be + * updated outside the IRQ subsystem + * - more importantly, these are useful for edge triggered interrupts, + * IRQ probing, etc., but we are only handling MSI/MSIx interrupts here + * and these states shouldn't apply to us. + * + * However, we do update irq_stats - we somewhat duplicate the code in + * kstat_incr_irqs_this_cpu() for this since this function is defined + * in irq/internal.h which we don't want to include here. + * The only difference is that desc->kstat_irqs is an allocated per CPU + * variable and could have been vmalloc'ed, so we can't directly + * call __this_cpu_inc() on it. The kstat structure is a static + * per CPU variable and it should be accessible by real-mode KVM. + * + */ +static void kvmppc_rm_handle_irq_desc(struct irq_desc *desc) +{ + this_cpu_inc_rm(desc->kstat_irqs); + __this_cpu_inc(kstat.irqs_sum); +} + long kvmppc_deliver_irq_passthru(struct kvm_vcpu *vcpu, u32 xirr, struct kvmppc_irq_map *irq_map, @@ -747,6 +796,7 @@ long kvmppc_deliver_irq_passthru(struct kvm_vcpu *vcpu, xics = vcpu->kvm->arch.xics; icp = vcpu->arch.icp; + kvmppc_rm_handle_irq_desc(irq_map->desc); icp_rm_deliver_irq(xics, icp, irq); /* EOI the interrupt */ |