- New VFIO_SET_IRQ ioctl option to pass the eventfd that is signaled when an error occurs in the vfio_pci_device - Register pci_error_handler for the vfio_pci driver - When the device encounters an error, the error handler registered by the vfio_pci driver gets invoked by the AER infrastructure - In the error handler, signal the eventfd registered for the device. - This results in the qemu eventfd handler getting invoked and appropriate action taken for the guest. Signed-off-by: Vijay Mohan Pandarathil <vijaymohan.pandarathil@xxxxxx> --- drivers/vfio/pci/vfio_pci.c | 44 ++++++++++++++++++++++++++++++++- drivers/vfio/pci/vfio_pci_intrs.c | 49 +++++++++++++++++++++++++++++++++++++ drivers/vfio/pci/vfio_pci_private.h | 1 + include/uapi/linux/vfio.h | 1 + 4 files changed, 94 insertions(+), 1 deletion(-) diff --git a/drivers/vfio/pci/vfio_pci.c b/drivers/vfio/pci/vfio_pci.c index b28e66c..cd99321 100644 --- a/drivers/vfio/pci/vfio_pci.c +++ b/drivers/vfio/pci/vfio_pci.c @@ -196,7 +196,9 @@ static int vfio_pci_get_irq_count(struct vfio_pci_device *vdev, int irq_type) return (flags & PCI_MSIX_FLAGS_QSIZE) + 1; } - } + } else if (irq_type == VFIO_PCI_ERR_IRQ_INDEX) + if (pci_is_pcie(vdev->pdev)) + return 1; return 0; } @@ -302,6 +304,17 @@ static long vfio_pci_ioctl(void *device_data, if (info.argsz < minsz || info.index >= VFIO_PCI_NUM_IRQS) return -EINVAL; + switch (info.index) { + case VFIO_PCI_INTX_IRQ_INDEX ... VFIO_PCI_MSIX_IRQ_INDEX: + break; + case VFIO_PCI_ERR_IRQ_INDEX: + if (pci_is_pcie(vdev->pdev)) + break; + /* pass thru to return error */ + default: + return -EINVAL; + } + info.flags = VFIO_IRQ_INFO_EVENTFD; info.count = vfio_pci_get_irq_count(vdev, info.index); @@ -538,11 +551,40 @@ static void vfio_pci_remove(struct pci_dev *pdev) kfree(vdev); } +static pci_ers_result_t vfio_pci_aer_err_detected(struct pci_dev *pdev, + pci_channel_state_t state) +{ + struct vfio_pci_device *vdev; + struct vfio_device *device; + + device = vfio_device_get_from_dev(&pdev->dev); + if (device == NULL) + return PCI_ERS_RESULT_DISCONNECT; + + vdev = vfio_device_data(device); + if (vdev == NULL) { + vfio_device_put(device); + return PCI_ERS_RESULT_DISCONNECT; + } + + if (vdev->err_trigger) + eventfd_signal(vdev->err_trigger, 1); + + vfio_device_put(device); + + return PCI_ERS_RESULT_CAN_RECOVER; +} + +static struct pci_error_handlers vfio_err_handlers = { + .error_detected = vfio_pci_aer_err_detected, +}; + static struct pci_driver vfio_pci_driver = { .name = "vfio-pci", .id_table = NULL, /* only dynamic ids */ .probe = vfio_pci_probe, .remove = vfio_pci_remove, + .err_handler = &vfio_err_handlers, }; static void __exit vfio_pci_cleanup(void) diff --git a/drivers/vfio/pci/vfio_pci_intrs.c b/drivers/vfio/pci/vfio_pci_intrs.c index 3639371..4a29830 100644 --- a/drivers/vfio/pci/vfio_pci_intrs.c +++ b/drivers/vfio/pci/vfio_pci_intrs.c @@ -745,6 +745,48 @@ static int vfio_pci_set_msi_trigger(struct vfio_pci_device *vdev, return 0; } +static int vfio_pci_set_err_trigger(struct vfio_pci_device *vdev, + unsigned index, unsigned start, + unsigned count, uint32_t flags, void *data) +{ + int32_t fd = *(int32_t *)data; + + if ((index != VFIO_PCI_ERR_IRQ_INDEX) || + !(flags & VFIO_IRQ_SET_DATA_TYPE_MASK)) + return -EINVAL; + + /* DATA_NONE/DATA_BOOL enables loopback testing */ + + if (flags & VFIO_IRQ_SET_DATA_NONE) { + if (vdev->err_trigger) + eventfd_signal(vdev->err_trigger, 1); + return 0; + } else if (flags & VFIO_IRQ_SET_DATA_BOOL) { + uint8_t trigger = *(uint8_t *)data; + if (trigger && vdev->err_trigger) + eventfd_signal(vdev->err_trigger, 1); + return 0; + } + + /* Handle SET_DATA_EVENTFD */ + + if (fd == -1) { + if (vdev->err_trigger) + eventfd_ctx_put(vdev->err_trigger); + vdev->err_trigger = NULL; + return 0; + } else if (fd >= 0) { + struct eventfd_ctx *efdctx; + efdctx = eventfd_ctx_fdget(fd); + if (IS_ERR(efdctx)) + return PTR_ERR(efdctx); + if (vdev->err_trigger) + eventfd_ctx_put(vdev->err_trigger); + vdev->err_trigger = efdctx; + return 0; + } else + return -EINVAL; +} int vfio_pci_set_irqs_ioctl(struct vfio_pci_device *vdev, uint32_t flags, unsigned index, unsigned start, unsigned count, void *data) @@ -779,6 +821,13 @@ int vfio_pci_set_irqs_ioctl(struct vfio_pci_device *vdev, uint32_t flags, break; } break; + case VFIO_PCI_ERR_IRQ_INDEX: + switch (flags & VFIO_IRQ_SET_ACTION_TYPE_MASK) { + case VFIO_IRQ_SET_ACTION_TRIGGER: + if (pci_is_pcie(vdev->pdev)) + func = vfio_pci_set_err_trigger; + break; + } } if (!func) diff --git a/drivers/vfio/pci/vfio_pci_private.h b/drivers/vfio/pci/vfio_pci_private.h index 611827c..daee62f 100644 --- a/drivers/vfio/pci/vfio_pci_private.h +++ b/drivers/vfio/pci/vfio_pci_private.h @@ -55,6 +55,7 @@ struct vfio_pci_device { bool bardirty; struct pci_saved_state *pci_saved_state; atomic_t refcnt; + struct eventfd_ctx *err_trigger; }; #define is_intx(vdev) (vdev->irq_type == VFIO_PCI_INTX_IRQ_INDEX) diff --git a/include/uapi/linux/vfio.h b/include/uapi/linux/vfio.h index 4758d1b..7d50af4 100644 --- a/include/uapi/linux/vfio.h +++ b/include/uapi/linux/vfio.h @@ -310,6 +310,7 @@ enum { VFIO_PCI_INTX_IRQ_INDEX, VFIO_PCI_MSI_IRQ_INDEX, VFIO_PCI_MSIX_IRQ_INDEX, + VFIO_PCI_ERR_IRQ_INDEX, VFIO_PCI_NUM_IRQS }; -- 1.7.11.3 -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html