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authorChristoph Hellwig <hch@lst.de>2016-09-11 16:31:26 +0300
committerAlex Williamson <alex.williamson@redhat.com>2016-09-29 22:36:38 +0300
commit61771468e0a567f007fc450725063bb9cf7eb199 (patch)
tree5065da5efca34a18e5cb0b0d9f7418e533444981 /drivers/vfio/pci/vfio_pci_intrs.c
parentc93a97ee0583cd65adaf872e7cc402493eae92a7 (diff)
downloadlinux-61771468e0a567f007fc450725063bb9cf7eb199.tar.xz
vfio_pci: use pci_alloc_irq_vectors
Simplify the interrupt setup by using the new PCI layer helpers. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Diffstat (limited to 'drivers/vfio/pci/vfio_pci_intrs.c')
-rw-r--r--drivers/vfio/pci/vfio_pci_intrs.c45
1 files changed, 10 insertions, 35 deletions
diff --git a/drivers/vfio/pci/vfio_pci_intrs.c b/drivers/vfio/pci/vfio_pci_intrs.c
index aa23e9a4a22f..c2e60893cd09 100644
--- a/drivers/vfio/pci/vfio_pci_intrs.c
+++ b/drivers/vfio/pci/vfio_pci_intrs.c
@@ -250,6 +250,7 @@ static irqreturn_t vfio_msihandler(int irq, void *arg)
static int vfio_msi_enable(struct vfio_pci_device *vdev, int nvec, bool msix)
{
struct pci_dev *pdev = vdev->pdev;
+ unsigned int flag = msix ? PCI_IRQ_MSIX : PCI_IRQ_MSI;
int ret;
if (!is_irq_none(vdev))
@@ -259,35 +260,13 @@ static int vfio_msi_enable(struct vfio_pci_device *vdev, int nvec, bool msix)
if (!vdev->ctx)
return -ENOMEM;
- if (msix) {
- int i;
-
- vdev->msix = kzalloc(nvec * sizeof(struct msix_entry),
- GFP_KERNEL);
- if (!vdev->msix) {
- kfree(vdev->ctx);
- return -ENOMEM;
- }
-
- for (i = 0; i < nvec; i++)
- vdev->msix[i].entry = i;
-
- ret = pci_enable_msix_range(pdev, vdev->msix, 1, nvec);
- if (ret < nvec) {
- if (ret > 0)
- pci_disable_msix(pdev);
- kfree(vdev->msix);
- kfree(vdev->ctx);
- return ret;
- }
- } else {
- ret = pci_enable_msi_range(pdev, 1, nvec);
- if (ret < nvec) {
- if (ret > 0)
- pci_disable_msi(pdev);
- kfree(vdev->ctx);
- return ret;
- }
+ /* return the number of supported vectors if we can't get all: */
+ ret = pci_alloc_irq_vectors(pdev, 1, nvec, flag);
+ if (ret < nvec) {
+ if (ret > 0)
+ pci_free_irq_vectors(pdev);
+ kfree(vdev->ctx);
+ return ret;
}
vdev->num_ctx = nvec;
@@ -315,7 +294,7 @@ static int vfio_msi_set_vector_signal(struct vfio_pci_device *vdev,
if (vector < 0 || vector >= vdev->num_ctx)
return -EINVAL;
- irq = msix ? vdev->msix[vector].vector : pdev->irq + vector;
+ irq = pci_irq_vector(pdev, vector);
if (vdev->ctx[vector].trigger) {
free_irq(irq, vdev->ctx[vector].trigger);
@@ -408,11 +387,7 @@ static void vfio_msi_disable(struct vfio_pci_device *vdev, bool msix)
vfio_msi_set_block(vdev, 0, vdev->num_ctx, NULL, msix);
- if (msix) {
- pci_disable_msix(vdev->pdev);
- kfree(vdev->msix);
- } else
- pci_disable_msi(pdev);
+ pci_free_irq_vectors(pdev);
/*
* Both disable paths above use pci_intx_for_msi() to clear DisINTx