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Message-Id: <1591352835-22441-2-git-send-email-lingshan.zhu@intel.com>
Date: Fri, 5 Jun 2020 18:27:11 +0800
From: Zhu Lingshan <lingshan.zhu@...el.com>
To: mst@...hat.com, kvm@...r.kernel.org,
virtualization@...ts.linux-foundation.org,
linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
jasowang@...hat.com
Cc: lulu@...hat.com, dan.daly@...el.com, cunming.liang@...el.com,
Zhu Lingshan <lingshan.zhu@...el.com>
Subject: [PATCH RESEND 1/5] ifcvf: move IRQ request/free to status change handlers
To comply with VIRTIO spec, this commit intends to move IRQ request
and free operations from probe() to device status changing handler,
would handle datapath start/stop in the handler as well.
VIRTIO spec 1.1, section 2.1.2 Device Requirements: Device Status Field
The device MUST NOT consume buffers or send any used buffer
notifications to the driver before DRIVER_OK.
Signed-off-by: Zhu Lingshan <lingshan.zhu@...el.com>
Acked-by: Jason Wang <jasowang@...hat.com>
---
drivers/vdpa/ifcvf/ifcvf_main.c | 120 ++++++++++++++++++++++++----------------
1 file changed, 73 insertions(+), 47 deletions(-)
diff --git a/drivers/vdpa/ifcvf/ifcvf_main.c b/drivers/vdpa/ifcvf/ifcvf_main.c
index abf6a061..d529ed6 100644
--- a/drivers/vdpa/ifcvf/ifcvf_main.c
+++ b/drivers/vdpa/ifcvf/ifcvf_main.c
@@ -28,6 +28,60 @@ static irqreturn_t ifcvf_intr_handler(int irq, void *arg)
return IRQ_HANDLED;
}
+static void ifcvf_free_irq_vectors(void *data)
+{
+ pci_free_irq_vectors(data);
+}
+
+static void ifcvf_free_irq(struct ifcvf_adapter *adapter, int queues)
+{
+ struct pci_dev *pdev = adapter->pdev;
+ struct ifcvf_hw *vf = &adapter->vf;
+ int i;
+
+
+ for (i = 0; i < queues; i++)
+ devm_free_irq(&pdev->dev, vf->vring[i].irq, &vf->vring[i]);
+
+ ifcvf_free_irq_vectors(pdev);
+}
+
+static int ifcvf_request_irq(struct ifcvf_adapter *adapter)
+{
+ struct pci_dev *pdev = adapter->pdev;
+ struct ifcvf_hw *vf = &adapter->vf;
+ int vector, i, ret, irq;
+
+ ret = pci_alloc_irq_vectors(pdev, IFCVF_MAX_INTR,
+ IFCVF_MAX_INTR, PCI_IRQ_MSIX);
+ if (ret < 0) {
+ IFCVF_ERR(pdev, "Failed to alloc IRQ vectors\n");
+ return ret;
+ }
+
+ for (i = 0; i < IFCVF_MAX_QUEUE_PAIRS * 2; i++) {
+ snprintf(vf->vring[i].msix_name, 256, "ifcvf[%s]-%d\n",
+ pci_name(pdev), i);
+ vector = i + IFCVF_MSI_QUEUE_OFF;
+ irq = pci_irq_vector(pdev, vector);
+ ret = devm_request_irq(&pdev->dev, irq,
+ ifcvf_intr_handler, 0,
+ vf->vring[i].msix_name,
+ &vf->vring[i]);
+ if (ret) {
+ IFCVF_ERR(pdev,
+ "Failed to request irq for vq %d\n", i);
+ ifcvf_free_irq(adapter, i);
+
+ return ret;
+ }
+
+ vf->vring[i].irq = irq;
+ }
+
+ return 0;
+}
+
static int ifcvf_start_datapath(void *private)
{
struct ifcvf_hw *vf = ifcvf_private_to_vf(private);
@@ -118,17 +172,34 @@ static void ifcvf_vdpa_set_status(struct vdpa_device *vdpa_dev, u8 status)
{
struct ifcvf_adapter *adapter;
struct ifcvf_hw *vf;
+ u8 status_old;
+ int ret;
vf = vdpa_to_vf(vdpa_dev);
adapter = dev_get_drvdata(vdpa_dev->dev.parent);
+ status_old = ifcvf_get_status(vf);
- if (status == 0) {
+ if ((status_old & VIRTIO_CONFIG_S_DRIVER_OK) &&
+ !(status & VIRTIO_CONFIG_S_DRIVER_OK)) {
ifcvf_stop_datapath(adapter);
+ ifcvf_free_irq(adapter, IFCVF_MAX_QUEUE_PAIRS * 2);
+ }
+
+ if (status == 0) {
ifcvf_reset_vring(adapter);
return;
}
- if (status & VIRTIO_CONFIG_S_DRIVER_OK) {
+ if ((status & VIRTIO_CONFIG_S_DRIVER_OK) &&
+ !(status_old & VIRTIO_CONFIG_S_DRIVER_OK)) {
+ ret = ifcvf_request_irq(adapter);
+ if (ret) {
+ status = ifcvf_get_status(vf);
+ status |= VIRTIO_CONFIG_S_FAILED;
+ ifcvf_set_status(vf, status);
+ return;
+ }
+
if (ifcvf_start_datapath(adapter) < 0)
IFCVF_ERR(adapter->pdev,
"Failed to set ifcvf vdpa status %u\n",
@@ -284,38 +355,6 @@ static void ifcvf_vdpa_set_config_cb(struct vdpa_device *vdpa_dev,
.set_config_cb = ifcvf_vdpa_set_config_cb,
};
-static int ifcvf_request_irq(struct ifcvf_adapter *adapter)
-{
- struct pci_dev *pdev = adapter->pdev;
- struct ifcvf_hw *vf = &adapter->vf;
- int vector, i, ret, irq;
-
-
- for (i = 0; i < IFCVF_MAX_QUEUE_PAIRS * 2; i++) {
- snprintf(vf->vring[i].msix_name, 256, "ifcvf[%s]-%d\n",
- pci_name(pdev), i);
- vector = i + IFCVF_MSI_QUEUE_OFF;
- irq = pci_irq_vector(pdev, vector);
- ret = devm_request_irq(&pdev->dev, irq,
- ifcvf_intr_handler, 0,
- vf->vring[i].msix_name,
- &vf->vring[i]);
- if (ret) {
- IFCVF_ERR(pdev,
- "Failed to request irq for vq %d\n", i);
- return ret;
- }
- vf->vring[i].irq = irq;
- }
-
- return 0;
-}
-
-static void ifcvf_free_irq_vectors(void *data)
-{
- pci_free_irq_vectors(data);
-}
-
static int ifcvf_probe(struct pci_dev *pdev, const struct pci_device_id *id)
{
struct device *dev = &pdev->dev;
@@ -349,13 +388,6 @@ static int ifcvf_probe(struct pci_dev *pdev, const struct pci_device_id *id)
return ret;
}
- ret = pci_alloc_irq_vectors(pdev, IFCVF_MAX_INTR,
- IFCVF_MAX_INTR, PCI_IRQ_MSIX);
- if (ret < 0) {
- IFCVF_ERR(pdev, "Failed to alloc irq vectors\n");
- return ret;
- }
-
ret = devm_add_action_or_reset(dev, ifcvf_free_irq_vectors, pdev);
if (ret) {
IFCVF_ERR(pdev,
@@ -379,12 +411,6 @@ static int ifcvf_probe(struct pci_dev *pdev, const struct pci_device_id *id)
adapter->pdev = pdev;
adapter->vdpa.dma_dev = &pdev->dev;
- ret = ifcvf_request_irq(adapter);
- if (ret) {
- IFCVF_ERR(pdev, "Failed to request MSI-X irq\n");
- goto err;
- }
-
ret = ifcvf_init_hw(vf, pdev);
if (ret) {
IFCVF_ERR(pdev, "Failed to init IFCVF hw\n");
--
1.8.3.1
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