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authorChristoph Hellwig <hch@lst.de>2017-02-01 15:42:57 +0100
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2017-02-03 11:49:06 +0100
commit3bb434cdcc6af3d4e70ba041e6f596e465d11e14 (patch)
tree75a76770dbbc659ad38dd3bcb365eed0d156244a /drivers/misc
parentcadf8106661c061ab5041282a8e088de4e470526 (diff)
vmw_vmci: switch to pci_irq_alloc_vectors
Cleans up the IRQ management code a lot, including removing a lot of state from the per-device structure. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/misc')
-rw-r--r--drivers/misc/vmw_vmci/vmci_guest.c75
1 files changed, 20 insertions, 55 deletions
diff --git a/drivers/misc/vmw_vmci/vmci_guest.c b/drivers/misc/vmw_vmci/vmci_guest.c
index 189b32519748..9d659542a335 100644
--- a/drivers/misc/vmw_vmci/vmci_guest.c
+++ b/drivers/misc/vmw_vmci/vmci_guest.c
@@ -54,10 +54,7 @@ struct vmci_guest_device {
struct device *dev; /* PCI device we are attached to */
void __iomem *iobase;
- unsigned int irq;
- unsigned int intr_type;
bool exclusive_vectors;
- struct msix_entry msix_entries[VMCI_MAX_INTRS];
struct tasklet_struct datagram_tasklet;
struct tasklet_struct bm_tasklet;
@@ -369,30 +366,6 @@ static void vmci_process_bitmap(unsigned long data)
}
/*
- * Enable MSI-X. Try exclusive vectors first, then shared vectors.
- */
-static int vmci_enable_msix(struct pci_dev *pdev,
- struct vmci_guest_device *vmci_dev)
-{
- int i;
- int result;
-
- for (i = 0; i < VMCI_MAX_INTRS; ++i) {
- vmci_dev->msix_entries[i].entry = i;
- vmci_dev->msix_entries[i].vector = i;
- }
-
- result = pci_enable_msix_exact(pdev,
- vmci_dev->msix_entries, VMCI_MAX_INTRS);
- if (result == 0)
- vmci_dev->exclusive_vectors = true;
- else if (result == -ENOSPC)
- result = pci_enable_msix_exact(pdev, vmci_dev->msix_entries, 1);
-
- return result;
-}
-
-/*
* Interrupt handler for legacy or MSI interrupt, or for first MSI-X
* interrupt (vector VMCI_INTR_DATAGRAM).
*/
@@ -406,7 +379,7 @@ static irqreturn_t vmci_interrupt(int irq, void *_dev)
* Otherwise we must read the ICR to determine what to do.
*/
- if (dev->intr_type == VMCI_INTR_TYPE_MSIX && dev->exclusive_vectors) {
+ if (dev->exclusive_vectors) {
tasklet_schedule(&dev->datagram_tasklet);
} else {
unsigned int icr;
@@ -491,7 +464,6 @@ static int vmci_guest_probe_device(struct pci_dev *pdev,
}
vmci_dev->dev = &pdev->dev;
- vmci_dev->intr_type = VMCI_INTR_TYPE_INTX;
vmci_dev->exclusive_vectors = false;
vmci_dev->iobase = iobase;
@@ -592,26 +564,26 @@ static int vmci_guest_probe_device(struct pci_dev *pdev,
* Enable interrupts. Try MSI-X first, then MSI, and then fallback on
* legacy interrupts.
*/
- if (!vmci_disable_msix && !vmci_enable_msix(pdev, vmci_dev)) {
- vmci_dev->intr_type = VMCI_INTR_TYPE_MSIX;
- vmci_dev->irq = vmci_dev->msix_entries[0].vector;
- } else if (!vmci_disable_msi && !pci_enable_msi(pdev)) {
- vmci_dev->intr_type = VMCI_INTR_TYPE_MSI;
- vmci_dev->irq = pdev->irq;
+ error = pci_alloc_irq_vectors(pdev, VMCI_MAX_INTRS, VMCI_MAX_INTRS,
+ PCI_IRQ_MSIX);
+ if (error) {
+ error = pci_alloc_irq_vectors(pdev, 1, 1,
+ PCI_IRQ_MSIX | PCI_IRQ_MSI | PCI_IRQ_LEGACY);
+ if (error)
+ goto err_remove_bitmap;
} else {
- vmci_dev->intr_type = VMCI_INTR_TYPE_INTX;
- vmci_dev->irq = pdev->irq;
+ vmci_dev->exclusive_vectors = true;
}
/*
* Request IRQ for legacy or MSI interrupts, or for first
* MSI-X vector.
*/
- error = request_irq(vmci_dev->irq, vmci_interrupt, IRQF_SHARED,
- KBUILD_MODNAME, vmci_dev);
+ error = request_irq(pci_irq_vector(pdev, 0), vmci_interrupt,
+ IRQF_SHARED, KBUILD_MODNAME, vmci_dev);
if (error) {
dev_err(&pdev->dev, "Irq %u in use: %d\n",
- vmci_dev->irq, error);
+ pci_irq_vector(pdev, 0), error);
goto err_disable_msi;
}
@@ -622,13 +594,13 @@ static int vmci_guest_probe_device(struct pci_dev *pdev,
* between the vectors.
*/
if (vmci_dev->exclusive_vectors) {
- error = request_irq(vmci_dev->msix_entries[1].vector,
+ error = request_irq(pci_irq_vector(pdev, 1),
vmci_interrupt_bm, 0, KBUILD_MODNAME,
vmci_dev);
if (error) {
dev_err(&pdev->dev,
"Failed to allocate irq %u: %d\n",
- vmci_dev->msix_entries[1].vector, error);
+ pci_irq_vector(pdev, 1), error);
goto err_free_irq;
}
}
@@ -651,15 +623,12 @@ static int vmci_guest_probe_device(struct pci_dev *pdev,
return 0;
err_free_irq:
- free_irq(vmci_dev->irq, vmci_dev);
+ free_irq(pci_irq_vector(pdev, 0), vmci_dev);
tasklet_kill(&vmci_dev->datagram_tasklet);
tasklet_kill(&vmci_dev->bm_tasklet);
err_disable_msi:
- if (vmci_dev->intr_type == VMCI_INTR_TYPE_MSIX)
- pci_disable_msix(pdev);
- else if (vmci_dev->intr_type == VMCI_INTR_TYPE_MSI)
- pci_disable_msi(pdev);
+ pci_free_irq_vectors(pdev);
vmci_err = vmci_event_unsubscribe(ctx_update_sub_id);
if (vmci_err < VMCI_SUCCESS)
@@ -719,14 +688,10 @@ static void vmci_guest_remove_device(struct pci_dev *pdev)
* MSI-X, we might have multiple vectors, each with their own
* IRQ, which we must free too.
*/
- free_irq(vmci_dev->irq, vmci_dev);
- if (vmci_dev->intr_type == VMCI_INTR_TYPE_MSIX) {
- if (vmci_dev->exclusive_vectors)
- free_irq(vmci_dev->msix_entries[1].vector, vmci_dev);
- pci_disable_msix(pdev);
- } else if (vmci_dev->intr_type == VMCI_INTR_TYPE_MSI) {
- pci_disable_msi(pdev);
- }
+ if (vmci_dev->exclusive_vectors)
+ free_irq(pci_irq_vector(pdev, 1), vmci_dev);
+ free_irq(pci_irq_vector(pdev, 0), vmci_dev);
+ pci_free_irq_vectors(pdev);
tasklet_kill(&vmci_dev->datagram_tasklet);
tasklet_kill(&vmci_dev->bm_tasklet);