From 4fe75a8ccd8005f8d0322c5b85ebee6243b2e753 Mon Sep 17 00:00:00 2001 From: =?utf8?q?C=C3=A9dric=20Le=20Goater?= Date: Mon, 18 Jun 2018 19:34:00 +0200 Subject: [PATCH] spapr: split the IRQ allocation sequence MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit Today, when a device requests for IRQ number in a sPAPR machine, the spapr_irq_alloc() routine first scans the ICSState status array to find an empty slot and then performs the assignement of the selected numbers. Split this sequence in two distinct routines : spapr_irq_find() for lookups and spapr_irq_claim() for claiming the IRQ numbers. This will ease the introduction of a static layout of IRQ numbers. Signed-off-by: Cédric Le Goater Signed-off-by: David Gibson --- hw/ppc/spapr.c | 50 ++++++++++++++++++++++++++++++++++++++++++++++++++ hw/ppc/spapr_events.c | 18 ++++++++++++++---- hw/ppc/spapr_pci.c | 23 ++++++++++++++++++++--- hw/ppc/spapr_vio.c | 10 +++++++++- include/hw/ppc/spapr.h | 4 ++++ 5 files changed, 97 insertions(+), 8 deletions(-) diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c index 4a0b679166..b7705c3944 100644 --- a/hw/ppc/spapr.c +++ b/hw/ppc/spapr.c @@ -3816,6 +3816,36 @@ static int ics_find_free_block(ICSState *ics, int num, int alignnum) 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; +} + /* * Allocate the IRQ number and set the IRQ type, LSI or MSI */ @@ -3894,6 +3924,26 @@ int spapr_irq_alloc_block(sPAPRMachineState *spapr, int num, bool lsi, return first; } +int spapr_irq_claim(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; + } + + spapr_irq_set_lsi(spapr, irq, lsi); + return 0; +} + void spapr_irq_free(sPAPRMachineState *spapr, int irq, int num) { ICSState *ics = spapr->ics; diff --git a/hw/ppc/spapr_events.c b/hw/ppc/spapr_events.c index 86836f0626..e4f5946a21 100644 --- a/hw/ppc/spapr_events.c +++ b/hw/ppc/spapr_events.c @@ -707,13 +707,18 @@ void spapr_clear_pending_events(sPAPRMachineState *spapr) void spapr_events_init(sPAPRMachineState *spapr) { + int epow_irq; + + epow_irq = spapr_irq_findone(spapr, &error_fatal); + + spapr_irq_claim(spapr, epow_irq, false, &error_fatal); + QTAILQ_INIT(&spapr->pending_events); spapr->event_sources = spapr_event_sources_new(); spapr_event_sources_register(spapr->event_sources, EVENT_CLASS_EPOW, - spapr_irq_alloc(spapr, 0, false, - &error_fatal)); + epow_irq); /* NOTE: if machine supports modern/dedicated hotplug event source, * we add it to the device-tree unconditionally. This means we may @@ -724,9 +729,14 @@ void spapr_events_init(sPAPRMachineState *spapr) * checking that it's enabled. */ if (spapr->use_hotplug_event_source) { + int hp_irq; + + hp_irq = spapr_irq_findone(spapr, &error_fatal); + + spapr_irq_claim(spapr, hp_irq, false, &error_fatal); + spapr_event_sources_register(spapr->event_sources, EVENT_CLASS_HOT_PLUG, - spapr_irq_alloc(spapr, 0, false, - &error_fatal)); + hp_irq); } spapr->epow_notifier.notify = spapr_powerdown_req; diff --git a/hw/ppc/spapr_pci.c b/hw/ppc/spapr_pci.c index f936ce63ef..497b896c7d 100644 --- a/hw/ppc/spapr_pci.c +++ b/hw/ppc/spapr_pci.c @@ -279,6 +279,7 @@ static void rtas_ibm_change_msi(PowerPCCPU *cpu, sPAPRMachineState *spapr, spapr_pci_msi *msi; int *config_addr_key; Error *err = NULL; + int i; /* Fins sPAPRPHBState */ phb = spapr_pci_find_phb(spapr, buid); @@ -371,8 +372,7 @@ static void rtas_ibm_change_msi(PowerPCCPU *cpu, sPAPRMachineState *spapr, } /* Allocate MSIs */ - irq = spapr_irq_alloc_block(spapr, req_num, false, - ret_intr_type == RTAS_TYPE_MSI, &err); + irq = spapr_irq_find(spapr, req_num, ret_intr_type == RTAS_TYPE_MSI, &err); if (err) { error_reportf_err(err, "Can't allocate MSIs for device %x: ", config_addr); @@ -380,6 +380,16 @@ static void rtas_ibm_change_msi(PowerPCCPU *cpu, sPAPRMachineState *spapr, return; } + for (i = 0; i < req_num; i++) { + spapr_irq_claim(spapr, irq + i, false, &err); + if (err) { + error_reportf_err(err, "Can't allocate MSIs for device %x: ", + config_addr); + rtas_st(rets, 0, RTAS_OUT_HW_ERROR); + return; + } + } + /* Release previous MSIs */ if (msi) { spapr_irq_free(spapr, msi->first_irq, msi->num); @@ -1698,7 +1708,14 @@ static void spapr_phb_realize(DeviceState *dev, Error **errp) uint32_t irq; Error *local_err = NULL; - irq = spapr_irq_alloc_block(spapr, 1, true, false, &local_err); + irq = spapr_irq_findone(spapr, &local_err); + if (local_err) { + error_propagate(errp, local_err); + error_prepend(errp, "can't allocate LSIs: "); + return; + } + + spapr_irq_claim(spapr, irq, true, &local_err); if (local_err) { error_propagate(errp, local_err); error_prepend(errp, "can't allocate LSIs: "); diff --git a/hw/ppc/spapr_vio.c b/hw/ppc/spapr_vio.c index 4555c648a8..daf85130b5 100644 --- a/hw/ppc/spapr_vio.c +++ b/hw/ppc/spapr_vio.c @@ -475,7 +475,15 @@ static void spapr_vio_busdev_realize(DeviceState *qdev, Error **errp) dev->qdev.id = id; } - dev->irq = spapr_irq_alloc(spapr, dev->irq, false, &local_err); + if (!dev->irq) { + dev->irq = spapr_irq_findone(spapr, &local_err); + if (local_err) { + error_propagate(errp, local_err); + return; + } + } + + spapr_irq_claim(spapr, dev->irq, false, &local_err); if (local_err) { error_propagate(errp, local_err); return; diff --git a/include/hw/ppc/spapr.h b/include/hw/ppc/spapr.h index 9dd46a72f6..6bfdf5a2fb 100644 --- a/include/hw/ppc/spapr.h +++ b/include/hw/ppc/spapr.h @@ -776,6 +776,10 @@ int spapr_irq_alloc(sPAPRMachineState *spapr, int irq_hint, bool lsi, Error **errp); int spapr_irq_alloc_block(sPAPRMachineState *spapr, int num, bool lsi, bool align, Error **errp); +int spapr_irq_find(sPAPRMachineState *spapr, int num, bool align, + Error **errp); +#define spapr_irq_findone(spapr, errp) spapr_irq_find(spapr, 1, false, errp) +int spapr_irq_claim(sPAPRMachineState *spapr, int irq, bool lsi, Error **errp); void spapr_irq_free(sPAPRMachineState *spapr, int irq, int num); qemu_irq spapr_qirq(sPAPRMachineState *spapr, int irq); -- 2.11.0