| 1 | /* |
| 2 | * Remote IO Hub |
| 3 | * |
| 4 | * Copyright © 2018, 2021 Oracle and/or its affiliates. |
| 5 | * |
| 6 | * This work is licensed under the terms of the GNU GPL, version 2 or later. |
| 7 | * See the COPYING file in the top-level directory. |
| 8 | * |
| 9 | */ |
| 10 | |
| 11 | #include "qemu/osdep.h" |
| 12 | |
| 13 | #include "hw/pci/pci.h" |
| 14 | #include "hw/pci/pci_ids.h" |
| 15 | #include "hw/pci/pci_bus.h" |
| 16 | #include "qemu/thread.h" |
| 17 | #include "hw/remote/machine.h" |
| 18 | #include "hw/remote/iohub.h" |
| 19 | #include "qemu/main-loop.h" |
| 20 | |
| 21 | void remote_iohub_init(RemoteIOHubState *iohub) |
| 22 | { |
| 23 | int pirq; |
| 24 | |
| 25 | memset(&iohub->irqfds, 0, sizeof(iohub->irqfds)); |
| 26 | memset(&iohub->resamplefds, 0, sizeof(iohub->resamplefds)); |
| 27 | |
| 28 | for (pirq = 0; pirq < REMOTE_IOHUB_NB_PIRQS; pirq++) { |
| 29 | qemu_mutex_init(&iohub->irq_level_lock[pirq]); |
| 30 | iohub->irq_level[pirq] = 0; |
| 31 | event_notifier_init_fd(&iohub->irqfds[pirq], -1); |
| 32 | event_notifier_init_fd(&iohub->resamplefds[pirq], -1); |
| 33 | } |
| 34 | } |
| 35 | |
| 36 | int remote_iohub_map_irq(PCIDevice *pci_dev, int intx) |
| 37 | { |
| 38 | return pci_dev->devfn; |
| 39 | } |
| 40 | |
| 41 | void remote_iohub_set_irq(void *opaque, int pirq, int level) |
| 42 | { |
| 43 | RemoteIOHubState *iohub = opaque; |
| 44 | |
| 45 | assert(pirq >= 0); |
| 46 | assert(pirq < PCI_DEVFN_MAX); |
| 47 | |
| 48 | QEMU_LOCK_GUARD(&iohub->irq_level_lock[pirq]); |
| 49 | |
| 50 | if (level) { |
| 51 | if (++iohub->irq_level[pirq] == 1) { |
| 52 | event_notifier_set(&iohub->irqfds[pirq]); |
| 53 | } |
| 54 | } else if (iohub->irq_level[pirq] > 0) { |
| 55 | iohub->irq_level[pirq]--; |
| 56 | } |
| 57 | } |
| 58 | |
| 59 | static void intr_resample_handler(void *opaque) |
| 60 | { |
| 61 | ResampleToken *token = opaque; |
| 62 | RemoteIOHubState *iohub = token->iohub; |
| 63 | int pirq, s; |
| 64 | |
| 65 | pirq = token->pirq; |
| 66 | |
| 67 | s = event_notifier_test_and_clear(&iohub->resamplefds[pirq]); |
| 68 | |
| 69 | assert(s >= 0); |
| 70 | |
| 71 | QEMU_LOCK_GUARD(&iohub->irq_level_lock[pirq]); |
| 72 | |
| 73 | if (iohub->irq_level[pirq]) { |
| 74 | event_notifier_set(&iohub->irqfds[pirq]); |
| 75 | } |
| 76 | } |
| 77 | |
| 78 | void process_set_irqfd_msg(PCIDevice *pci_dev, MPQemuMsg *msg) |
| 79 | { |
| 80 | RemoteMachineState *machine = REMOTE_MACHINE(current_machine); |
| 81 | RemoteIOHubState *iohub = &machine->iohub; |
| 82 | int pirq, intx; |
| 83 | |
| 84 | intx = pci_get_byte(pci_dev->config + PCI_INTERRUPT_PIN) - 1; |
| 85 | |
| 86 | pirq = remote_iohub_map_irq(pci_dev, intx); |
| 87 | |
| 88 | if (event_notifier_get_fd(&iohub->irqfds[pirq]) != -1) { |
| 89 | qemu_set_fd_handler(event_notifier_get_fd(&iohub->resamplefds[pirq]), |
| 90 | NULL, NULL, NULL); |
| 91 | event_notifier_cleanup(&iohub->irqfds[pirq]); |
| 92 | event_notifier_cleanup(&iohub->resamplefds[pirq]); |
| 93 | memset(&iohub->token[pirq], 0, sizeof(ResampleToken)); |
| 94 | } |
| 95 | |
| 96 | event_notifier_init_fd(&iohub->irqfds[pirq], msg->fds[0]); |
| 97 | event_notifier_init_fd(&iohub->resamplefds[pirq], msg->fds[1]); |
| 98 | |
| 99 | iohub->token[pirq].iohub = iohub; |
| 100 | iohub->token[pirq].pirq = pirq; |
| 101 | |
| 102 | qemu_set_fd_handler(msg->fds[1], intr_resample_handler, NULL, |
| 103 | &iohub->token[pirq]); |
| 104 | } |