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Date: Fri, 3 Feb 2017 10:00:07 +0000
From: "Jorgen S. Hansen" <jhansen@...are.com>
To: Christoph Hellwig <hch@....de>
CC: Adit Ranadive <aditr@...are.com>,
"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] vmw_vmci: switch to pci_irq_alloc_vectors
> On Feb 1, 2017, at 3:42 PM, Christoph Hellwig <hch@....de> wrote:
>
> 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@....de>
> ---
> drivers/misc/vmw_vmci/vmci_guest.c | 75 ++++++++++----------------------------
> include/linux/vmw_vmci_defs.h | 7 ----
> 2 files changed, 20 insertions(+), 62 deletions(-)
>
> diff --git a/drivers/misc/vmw_vmci/vmci_guest.c b/drivers/misc/vmw_vmci/vmci_guest.c
> index 189b325..9d65954 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);
> diff --git a/include/linux/vmw_vmci_defs.h b/include/linux/vmw_vmci_defs.h
> index 1bd31a3..b724ef7 100644
> --- a/include/linux/vmw_vmci_defs.h
> +++ b/include/linux/vmw_vmci_defs.h
> @@ -54,13 +54,6 @@
> #define VMCI_IMR_DATAGRAM 0x1
> #define VMCI_IMR_NOTIFICATION 0x2
>
> -/* Interrupt type. */
> -enum {
> - VMCI_INTR_TYPE_INTX = 0,
> - VMCI_INTR_TYPE_MSI = 1,
> - VMCI_INTR_TYPE_MSIX = 2,
> -};
> -
> /* Maximum MSI/MSI-X interrupt vectors in the device. */
> #define VMCI_MAX_INTRS 2
>
> --
> 2.1.4
>
Thanks for the cleanup! Looks great.
Reviewed-by: Jorgen Hansen <jhansen@...are.com>
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