[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[PATCH v16 03/10] virtio-pci: decouple the single vector from the interr
From: |
Cindy Lu |
Subject: |
[PATCH v16 03/10] virtio-pci: decouple the single vector from the interrupt process |
Date: |
Thu, 20 Oct 2022 22:26:25 +0800 |
To reuse the interrupt process in configure interrupt
Need to decouple the single vector from the interrupt process.
We add new function kvm_virtio_pci_vector_use_one and _release_one.
These functions are used for the single vector, the whole process will
finish in the loop with vq number.
Signed-off-by: Cindy Lu <lulu@redhat.com>
---
hw/virtio/virtio-pci.c | 131 +++++++++++++++++++++++------------------
1 file changed, 73 insertions(+), 58 deletions(-)
diff --git a/hw/virtio/virtio-pci.c b/hw/virtio/virtio-pci.c
index adcf4ddc1d..f450b8015e 100644
--- a/hw/virtio/virtio-pci.c
+++ b/hw/virtio/virtio-pci.c
@@ -677,7 +677,6 @@ static uint32_t virtio_read_config(PCIDevice *pci_dev,
}
static int kvm_virtio_pci_vq_vector_use(VirtIOPCIProxy *proxy,
- unsigned int queue_no,
unsigned int vector)
{
VirtIOIRQFD *irqfd = &proxy->vector_irqfd[vector];
@@ -742,87 +741,103 @@ static int virtio_pci_get_notifier(VirtIOPCIProxy
*proxy, int queue_no,
return 0;
}
-static int kvm_virtio_pci_vector_use(VirtIOPCIProxy *proxy, int nvqs)
+static int kvm_virtio_pci_vector_use_one(VirtIOPCIProxy *proxy, int queue_no)
{
+ unsigned int vector;
+ int ret;
+ EventNotifier *n;
PCIDevice *dev = &proxy->pci_dev;
VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
- unsigned int vector;
- int ret, queue_no;
- EventNotifier *n;
- for (queue_no = 0; queue_no < nvqs; queue_no++) {
- if (!virtio_queue_get_num(vdev, queue_no)) {
- break;
- }
- ret = virtio_pci_get_notifier(proxy, queue_no, &n, &vector);
- if (ret < 0) {
- break;
- }
- if (vector >= msix_nr_vectors_allocated(dev)) {
- continue;
- }
- ret = kvm_virtio_pci_vq_vector_use(proxy, queue_no, vector);
+
+ ret = virtio_pci_get_notifier(proxy, queue_no, &n, &vector);
+ if (ret < 0) {
+ return ret;
+ }
+ if (vector >= msix_nr_vectors_allocated(dev)) {
+ return 0;
+ }
+ ret = kvm_virtio_pci_vq_vector_use(proxy, vector);
+ if (ret < 0) {
+ goto undo;
+ }
+ /*
+ * If guest supports masking, set up irqfd now.
+ * Otherwise, delay until unmasked in the frontend.
+ */
+ if (vdev->use_guest_notifier_mask && k->guest_notifier_mask) {
+ ret = kvm_virtio_pci_irqfd_use(proxy, n, vector);
if (ret < 0) {
+ kvm_virtio_pci_vq_vector_release(proxy, vector);
goto undo;
}
- /* If guest supports masking, set up irqfd now.
- * Otherwise, delay until unmasked in the frontend.
- */
- if (vdev->use_guest_notifier_mask && k->guest_notifier_mask) {
- ret = kvm_virtio_pci_irqfd_use(proxy, n, vector);
- if (ret < 0) {
- kvm_virtio_pci_vq_vector_release(proxy, vector);
- goto undo;
- }
- }
}
- return 0;
+ return 0;
undo:
- while (--queue_no >= 0) {
- vector = virtio_queue_vector(vdev, queue_no);
- if (vector >= msix_nr_vectors_allocated(dev)) {
- continue;
+
+ vector = virtio_queue_vector(vdev, queue_no);
+ if (vector >= msix_nr_vectors_allocated(dev)) {
+ return ret;
+ }
+ if (vdev->use_guest_notifier_mask && k->guest_notifier_mask) {
+ ret = virtio_pci_get_notifier(proxy, queue_no, &n, &vector);
+ if (ret < 0) {
+ return ret;
}
- if (vdev->use_guest_notifier_mask && k->guest_notifier_mask) {
- ret = virtio_pci_get_notifier(proxy, queue_no, &n, &vector);
- if (ret < 0) {
- break;
- }
- kvm_virtio_pci_irqfd_release(proxy, n, vector);
+ kvm_virtio_pci_irqfd_release(proxy, n, vector);
+ }
+ return ret;
+}
+static int kvm_virtio_pci_vector_use(VirtIOPCIProxy *proxy, int nvqs)
+{
+ int queue_no;
+ int ret = 0;
+ VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
+
+ for (queue_no = 0; queue_no < nvqs; queue_no++) {
+ if (!virtio_queue_get_num(vdev, queue_no)) {
+ return -1;
}
- kvm_virtio_pci_vq_vector_release(proxy, vector);
+ ret = kvm_virtio_pci_vector_use_one(proxy, queue_no);
}
return ret;
}
-static void kvm_virtio_pci_vector_release(VirtIOPCIProxy *proxy, int nvqs)
+
+static void kvm_virtio_pci_vector_release_one(VirtIOPCIProxy *proxy,
+ int queue_no)
{
- PCIDevice *dev = &proxy->pci_dev;
VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
unsigned int vector;
- int queue_no;
- VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
EventNotifier *n;
- int ret ;
+ int ret;
+ VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
+ PCIDevice *dev = &proxy->pci_dev;
+
+ ret = virtio_pci_get_notifier(proxy, queue_no, &n, &vector);
+ if (ret < 0) {
+ return;
+ }
+ if (vector >= msix_nr_vectors_allocated(dev)) {
+ return;
+ }
+ if (vdev->use_guest_notifier_mask && k->guest_notifier_mask) {
+ kvm_virtio_pci_irqfd_release(proxy, n, vector);
+ }
+ kvm_virtio_pci_vq_vector_release(proxy, vector);
+}
+
+static void kvm_virtio_pci_vector_release(VirtIOPCIProxy *proxy, int nvqs)
+{
+ int queue_no;
+ VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
+
for (queue_no = 0; queue_no < nvqs; queue_no++) {
if (!virtio_queue_get_num(vdev, queue_no)) {
break;
}
- ret = virtio_pci_get_notifier(proxy, queue_no, &n, &vector);
- if (ret < 0) {
- break;
- }
- if (vector >= msix_nr_vectors_allocated(dev)) {
- continue;
- }
- /* If guest supports masking, clean up irqfd now.
- * Otherwise, it was cleaned when masked in the frontend.
- */
- if (vdev->use_guest_notifier_mask && k->guest_notifier_mask) {
- kvm_virtio_pci_irqfd_release(proxy, n, vector);
- }
- kvm_virtio_pci_vq_vector_release(proxy, vector);
+ kvm_virtio_pci_vector_release_one(proxy, queue_no);
}
}
--
2.34.3
- [PATCH v16 00/10] vhost-vdpa: add support for configure interrupt, Cindy Lu, 2022/10/20
- [PATCH v16 01/10] virtio: introduce macro VIRTIO_CONFIG_IRQ_IDX, Cindy Lu, 2022/10/20
- [PATCH v16 03/10] virtio-pci: decouple the single vector from the interrupt process,
Cindy Lu <=
- [PATCH v16 02/10] virtio-pci: decouple notifier from interrupt process, Cindy Lu, 2022/10/20
- [PATCH v16 04/10] vhost: introduce new VhostOps vhost_set_config_call, Cindy Lu, 2022/10/20
- [PATCH v16 05/10] vhost-vdpa: add support for config interrupt, Cindy Lu, 2022/10/20
- [PATCH v16 06/10] virtio: add support for configure interrupt, Cindy Lu, 2022/10/20
- [PATCH v16 07/10] vhost: add support for configure interrupt, Cindy Lu, 2022/10/20
- [PATCH v16 08/10] virtio-net: add support for configure interrupt, Cindy Lu, 2022/10/20
- [PATCH v16 10/10] virtio-pci: add support for configure interrupt, Cindy Lu, 2022/10/20
- [PATCH v16 09/10] virtio-mmio: add support for configure interrupt, Cindy Lu, 2022/10/20