From fb5e31d970ce8b4941f03ed765d7dbefc39f22d9 Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Sun, 5 Feb 2017 18:15:22 +0100 Subject: virtio: allow drivers to request IRQ affinity when creating VQs Add a struct irq_affinity pointer to the find_vqs methods, which if set is used to tell the PCI layer to create the MSI-X vectors for our I/O virtqueues with the proper affinity from the start. Compared to after the fact affinity hints this gives us an instantly working setup and allows to allocate the irq descritors node-local and avoid interconnect traffic. Last but not least this will allow blk-mq queues are created based on the interrupt affinity for storage drivers. Signed-off-by: Christoph Hellwig Reviewed-by: Jason Wang Signed-off-by: Michael S. Tsirkin --- drivers/virtio/virtio_balloon.c | 3 ++- drivers/virtio/virtio_input.c | 3 ++- drivers/virtio/virtio_mmio.c | 3 ++- drivers/virtio/virtio_pci_common.c | 19 ++++++++++++------- drivers/virtio/virtio_pci_common.h | 5 ++--- drivers/virtio/virtio_pci_modern.c | 7 +++---- 6 files changed, 23 insertions(+), 17 deletions(-) (limited to 'drivers/virtio') diff --git a/drivers/virtio/virtio_balloon.c b/drivers/virtio/virtio_balloon.c index 181793f07852..36c9c8fcb7f8 100644 --- a/drivers/virtio/virtio_balloon.c +++ b/drivers/virtio/virtio_balloon.c @@ -413,7 +413,8 @@ static int init_vqs(struct virtio_balloon *vb) * optionally stat. */ nvqs = virtio_has_feature(vb->vdev, VIRTIO_BALLOON_F_STATS_VQ) ? 3 : 2; - err = vb->vdev->config->find_vqs(vb->vdev, nvqs, vqs, callbacks, names); + err = vb->vdev->config->find_vqs(vb->vdev, nvqs, vqs, callbacks, names, + NULL); if (err) return err; diff --git a/drivers/virtio/virtio_input.c b/drivers/virtio/virtio_input.c index 350a2a5a49db..79f1293cda93 100644 --- a/drivers/virtio/virtio_input.c +++ b/drivers/virtio/virtio_input.c @@ -173,7 +173,8 @@ static int virtinput_init_vqs(struct virtio_input *vi) static const char * const names[] = { "events", "status" }; int err; - err = vi->vdev->config->find_vqs(vi->vdev, 2, vqs, cbs, names); + err = vi->vdev->config->find_vqs(vi->vdev, 2, vqs, cbs, names, + NULL); if (err) return err; vi->evt = vqs[0]; diff --git a/drivers/virtio/virtio_mmio.c b/drivers/virtio/virtio_mmio.c index 08357d70a891..78343b8f9034 100644 --- a/drivers/virtio/virtio_mmio.c +++ b/drivers/virtio/virtio_mmio.c @@ -446,7 +446,8 @@ error_available: static int vm_find_vqs(struct virtio_device *vdev, unsigned nvqs, struct virtqueue *vqs[], vq_callback_t *callbacks[], - const char * const names[]) + const char * const names[], + struct irq_affinity *desc) { struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev); unsigned int irq = platform_get_irq(vm_dev->pdev, 0); diff --git a/drivers/virtio/virtio_pci_common.c b/drivers/virtio/virtio_pci_common.c index 822f8e5dcee4..7902e920fc73 100644 --- a/drivers/virtio/virtio_pci_common.c +++ b/drivers/virtio/virtio_pci_common.c @@ -143,22 +143,28 @@ void vp_del_vqs(struct virtio_device *vdev) static int vp_find_vqs_msix(struct virtio_device *vdev, unsigned nvqs, struct virtqueue *vqs[], vq_callback_t *callbacks[], - const char * const names[]) + const char * const names[], struct irq_affinity *desc) { struct virtio_pci_device *vp_dev = to_vp_device(vdev); const char *name = dev_name(&vp_dev->vdev.dev); int i, err = -ENOMEM, allocated_vectors, nvectors; + unsigned flags = PCI_IRQ_MSIX; bool shared = false; u16 msix_vec; + if (desc) { + flags |= PCI_IRQ_AFFINITY; + desc->pre_vectors++; /* virtio config vector */ + } + nvectors = 1; for (i = 0; i < nvqs; i++) if (callbacks[i]) nvectors++; /* Try one vector per queue first. */ - err = pci_alloc_irq_vectors(vp_dev->pci_dev, nvectors, nvectors, - PCI_IRQ_MSIX); + err = pci_alloc_irq_vectors_affinity(vp_dev->pci_dev, nvectors, + nvectors, flags, desc); if (err < 0) { /* Fallback to one vector for config, one shared for queues. */ shared = true; @@ -308,13 +314,12 @@ out_remove_vqs: /* the config->find_vqs() implementation */ int vp_find_vqs(struct virtio_device *vdev, unsigned nvqs, - struct virtqueue *vqs[], - vq_callback_t *callbacks[], - const char * const names[]) + struct virtqueue *vqs[], vq_callback_t *callbacks[], + const char * const names[], struct irq_affinity *desc) { int err; - err = vp_find_vqs_msix(vdev, nvqs, vqs, callbacks, names); + err = vp_find_vqs_msix(vdev, nvqs, vqs, callbacks, names, desc); if (!err) return 0; return vp_find_vqs_intx(vdev, nvqs, vqs, callbacks, names); diff --git a/drivers/virtio/virtio_pci_common.h b/drivers/virtio/virtio_pci_common.h index 217ca876eed7..a6ad9ec6baef 100644 --- a/drivers/virtio/virtio_pci_common.h +++ b/drivers/virtio/virtio_pci_common.h @@ -97,9 +97,8 @@ bool vp_notify(struct virtqueue *vq); void vp_del_vqs(struct virtio_device *vdev); /* the config->find_vqs() implementation */ int vp_find_vqs(struct virtio_device *vdev, unsigned nvqs, - struct virtqueue *vqs[], - vq_callback_t *callbacks[], - const char * const names[]); + struct virtqueue *vqs[], vq_callback_t *callbacks[], + const char * const names[], struct irq_affinity *desc); const char *vp_bus_name(struct virtio_device *vdev); /* Setup the affinity for a virtqueue: diff --git a/drivers/virtio/virtio_pci_modern.c b/drivers/virtio/virtio_pci_modern.c index e5ce31091953..a7a0981e441c 100644 --- a/drivers/virtio/virtio_pci_modern.c +++ b/drivers/virtio/virtio_pci_modern.c @@ -384,13 +384,12 @@ err_map_notify: } static int vp_modern_find_vqs(struct virtio_device *vdev, unsigned nvqs, - struct virtqueue *vqs[], - vq_callback_t *callbacks[], - const char * const names[]) + struct virtqueue *vqs[], vq_callback_t *callbacks[], + const char * const names[], struct irq_affinity *desc) { struct virtio_pci_device *vp_dev = to_vp_device(vdev); struct virtqueue *vq; - int rc = vp_find_vqs(vdev, nvqs, vqs, callbacks, names); + int rc = vp_find_vqs(vdev, nvqs, vqs, callbacks, names, desc); if (rc) return rc; -- cgit v1.2.3