| /* |
| * QEMU PowerPC sPAPR IRQ interface |
| * |
| * Copyright (c) 2018, IBM Corporation. |
| * |
| * This code is licensed under the GPL version 2 or later. See the |
| * COPYING file in the top-level directory. |
| */ |
| |
| #include "qemu/osdep.h" |
| #include "qemu/log.h" |
| #include "qemu/error-report.h" |
| #include "qapi/error.h" |
| #include "hw/ppc/spapr.h" |
| #include "hw/ppc/xics.h" |
| #include "sysemu/kvm.h" |
| |
| #include "trace.h" |
| |
| void spapr_irq_msi_init(sPAPRMachineState *spapr, uint32_t nr_msis) |
| { |
| spapr->irq_map_nr = nr_msis; |
| spapr->irq_map = bitmap_new(spapr->irq_map_nr); |
| } |
| |
| int spapr_irq_msi_alloc(sPAPRMachineState *spapr, uint32_t num, bool align, |
| Error **errp) |
| { |
| int irq; |
| |
| /* |
| * The 'align_mask' parameter of bitmap_find_next_zero_area() |
| * should be one less than a power of 2; 0 means no |
| * alignment. Adapt the 'align' value of the former allocator |
| * to fit the requirements of bitmap_find_next_zero_area() |
| */ |
| align -= 1; |
| |
| irq = bitmap_find_next_zero_area(spapr->irq_map, spapr->irq_map_nr, 0, num, |
| align); |
| if (irq == spapr->irq_map_nr) { |
| error_setg(errp, "can't find a free %d-IRQ block", num); |
| return -1; |
| } |
| |
| bitmap_set(spapr->irq_map, irq, num); |
| |
| return irq + SPAPR_IRQ_MSI; |
| } |
| |
| void spapr_irq_msi_free(sPAPRMachineState *spapr, int irq, uint32_t num) |
| { |
| bitmap_clear(spapr->irq_map, irq - SPAPR_IRQ_MSI, num); |
| } |
| |
| void spapr_irq_msi_reset(sPAPRMachineState *spapr) |
| { |
| bitmap_clear(spapr->irq_map, 0, spapr->irq_map_nr); |
| } |
| |
| |
| /* |
| * XICS IRQ backend. |
| */ |
| |
| static ICSState *spapr_ics_create(sPAPRMachineState *spapr, |
| const char *type_ics, |
| int nr_irqs, Error **errp) |
| { |
| Error *local_err = NULL; |
| Object *obj; |
| |
| obj = object_new(type_ics); |
| object_property_add_child(OBJECT(spapr), "ics", obj, &error_abort); |
| object_property_add_const_link(obj, ICS_PROP_XICS, OBJECT(spapr), |
| &error_abort); |
| object_property_set_int(obj, nr_irqs, "nr-irqs", &local_err); |
| if (local_err) { |
| goto error; |
| } |
| object_property_set_bool(obj, true, "realized", &local_err); |
| if (local_err) { |
| goto error; |
| } |
| |
| return ICS_BASE(obj); |
| |
| error: |
| error_propagate(errp, local_err); |
| return NULL; |
| } |
| |
| static void spapr_irq_init_xics(sPAPRMachineState *spapr, Error **errp) |
| { |
| MachineState *machine = MACHINE(spapr); |
| sPAPRMachineClass *smc = SPAPR_MACHINE_GET_CLASS(spapr); |
| int nr_irqs = smc->irq->nr_irqs; |
| Error *local_err = NULL; |
| |
| /* Initialize the MSI IRQ allocator. */ |
| if (!SPAPR_MACHINE_GET_CLASS(spapr)->legacy_irq_allocation) { |
| spapr_irq_msi_init(spapr, XICS_IRQ_BASE + nr_irqs - SPAPR_IRQ_MSI); |
| } |
| |
| if (kvm_enabled()) { |
| if (machine_kernel_irqchip_allowed(machine) && |
| !xics_kvm_init(spapr, &local_err)) { |
| spapr->icp_type = TYPE_KVM_ICP; |
| spapr->ics = spapr_ics_create(spapr, TYPE_ICS_KVM, nr_irqs, |
| &local_err); |
| } |
| if (machine_kernel_irqchip_required(machine) && !spapr->ics) { |
| error_prepend(&local_err, |
| "kernel_irqchip requested but unavailable: "); |
| goto error; |
| } |
| error_free(local_err); |
| local_err = NULL; |
| } |
| |
| if (!spapr->ics) { |
| xics_spapr_init(spapr); |
| spapr->icp_type = TYPE_ICP; |
| spapr->ics = spapr_ics_create(spapr, TYPE_ICS_SIMPLE, nr_irqs, |
| &local_err); |
| } |
| |
| error: |
| error_propagate(errp, local_err); |
| } |
| |
| #define ICS_IRQ_FREE(ics, srcno) \ |
| (!((ics)->irqs[(srcno)].flags & (XICS_FLAGS_IRQ_MASK))) |
| |
| static int spapr_irq_claim_xics(sPAPRMachineState *spapr, int irq, bool lsi, |
| Error **errp) |
| { |
| ICSState *ics = spapr->ics; |
| |
| assert(ics); |
| |
| if (!ics_valid_irq(ics, irq)) { |
| error_setg(errp, "IRQ %d is invalid", irq); |
| return -1; |
| } |
| |
| if (!ICS_IRQ_FREE(ics, irq - ics->offset)) { |
| error_setg(errp, "IRQ %d is not free", irq); |
| return -1; |
| } |
| |
| ics_set_irq_type(ics, irq - ics->offset, lsi); |
| return 0; |
| } |
| |
| static void spapr_irq_free_xics(sPAPRMachineState *spapr, int irq, int num) |
| { |
| ICSState *ics = spapr->ics; |
| uint32_t srcno = irq - ics->offset; |
| int i; |
| |
| if (ics_valid_irq(ics, irq)) { |
| trace_spapr_irq_free(0, irq, num); |
| for (i = srcno; i < srcno + num; ++i) { |
| if (ICS_IRQ_FREE(ics, i)) { |
| trace_spapr_irq_free_warn(0, i); |
| } |
| memset(&ics->irqs[i], 0, sizeof(ICSIRQState)); |
| } |
| } |
| } |
| |
| static qemu_irq spapr_qirq_xics(sPAPRMachineState *spapr, int irq) |
| { |
| ICSState *ics = spapr->ics; |
| uint32_t srcno = irq - ics->offset; |
| |
| if (ics_valid_irq(ics, irq)) { |
| return ics->qirqs[srcno]; |
| } |
| |
| return NULL; |
| } |
| |
| static void spapr_irq_print_info_xics(sPAPRMachineState *spapr, Monitor *mon) |
| { |
| CPUState *cs; |
| |
| CPU_FOREACH(cs) { |
| PowerPCCPU *cpu = POWERPC_CPU(cs); |
| |
| icp_pic_print_info(ICP(cpu->intc), mon); |
| } |
| |
| ics_pic_print_info(spapr->ics, mon); |
| } |
| |
| sPAPRIrq spapr_irq_xics = { |
| .nr_irqs = XICS_IRQS_SPAPR, |
| |
| .init = spapr_irq_init_xics, |
| .claim = spapr_irq_claim_xics, |
| .free = spapr_irq_free_xics, |
| .qirq = spapr_qirq_xics, |
| .print_info = spapr_irq_print_info_xics, |
| }; |
| |
| /* |
| * sPAPR IRQ frontend routines for devices |
| */ |
| |
| int spapr_irq_claim(sPAPRMachineState *spapr, int irq, bool lsi, Error **errp) |
| { |
| sPAPRMachineClass *smc = SPAPR_MACHINE_GET_CLASS(spapr); |
| |
| return smc->irq->claim(spapr, irq, lsi, errp); |
| } |
| |
| void spapr_irq_free(sPAPRMachineState *spapr, int irq, int num) |
| { |
| sPAPRMachineClass *smc = SPAPR_MACHINE_GET_CLASS(spapr); |
| |
| smc->irq->free(spapr, irq, num); |
| } |
| |
| qemu_irq spapr_qirq(sPAPRMachineState *spapr, int irq) |
| { |
| sPAPRMachineClass *smc = SPAPR_MACHINE_GET_CLASS(spapr); |
| |
| return smc->irq->qirq(spapr, irq); |
| } |
| |
| /* |
| * XICS legacy routines - to deprecate one day |
| */ |
| |
| static int ics_find_free_block(ICSState *ics, int num, int alignnum) |
| { |
| int first, i; |
| |
| for (first = 0; first < ics->nr_irqs; first += alignnum) { |
| if (num > (ics->nr_irqs - first)) { |
| return -1; |
| } |
| for (i = first; i < first + num; ++i) { |
| if (!ICS_IRQ_FREE(ics, i)) { |
| break; |
| } |
| } |
| if (i == (first + num)) { |
| return first; |
| } |
| } |
| |
| return -1; |
| } |
| |
| int spapr_irq_find(sPAPRMachineState *spapr, int num, bool align, Error **errp) |
| { |
| ICSState *ics = spapr->ics; |
| int first = -1; |
| |
| assert(ics); |
| |
| /* |
| * MSIMesage::data is used for storing VIRQ so |
| * it has to be aligned to num to support multiple |
| * MSI vectors. MSI-X is not affected by this. |
| * The hint is used for the first IRQ, the rest should |
| * be allocated continuously. |
| */ |
| if (align) { |
| assert((num == 1) || (num == 2) || (num == 4) || |
| (num == 8) || (num == 16) || (num == 32)); |
| first = ics_find_free_block(ics, num, num); |
| } else { |
| first = ics_find_free_block(ics, num, 1); |
| } |
| |
| if (first < 0) { |
| error_setg(errp, "can't find a free %d-IRQ block", num); |
| return -1; |
| } |
| |
| return first + ics->offset; |
| } |
