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vfio/pci: Pass eventfd context to IRQ handler

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Create a link back to the vfio_pci_core_device on the eventfd context
object to avoid lookups in the interrupt path.  The context is known
valid in the interrupt handler.

Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Link: https://lore.kernel.org/r/20240401195406.3720453-2-alex.williamson@redhat.com
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
This commit is contained in:
Alex Williamson 2024-04-01 13:54:02 -06:00
parent af6605f87c
commit 071e7310e6
1 changed files with 11 additions and 13 deletions
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24
drivers/vfio/pci/vfio_pci_intrs.c
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@ -23,11 +23,12 @@
#include "vfio_pci_priv.h"
struct vfio_pci_irq_ctx {
struct eventfd_ctx *trigger;
struct virqfd *unmask;
struct virqfd *mask;
char *name;
bool masked;
struct vfio_pci_core_device *vdev;
struct eventfd_ctx *trigger;
struct virqfd *unmask;
struct virqfd *mask;
char *name;
bool masked;
struct irq_bypass_producer producer;
};
@ -228,15 +229,11 @@ void vfio_pci_intx_unmask(struct vfio_pci_core_device *vdev)
static irqreturn_t vfio_intx_handler(int irq, void *dev_id)
{
struct vfio_pci_core_device *vdev = dev_id;
struct vfio_pci_irq_ctx *ctx;
struct vfio_pci_irq_ctx *ctx = dev_id;
struct vfio_pci_core_device *vdev = ctx->vdev;
unsigned long flags;
int ret = IRQ_NONE;
ctx = vfio_irq_ctx_get(vdev, 0);
if (WARN_ON_ONCE(!ctx))
return ret;
spin_lock_irqsave(&vdev->irqlock, flags);
if (!vdev->pci_2_3) {
@ -282,6 +279,7 @@ static int vfio_intx_enable(struct vfio_pci_core_device *vdev,
ctx->name = name;
ctx->trigger = trigger;
ctx->vdev = vdev;
/*
* Fill the initial masked state based on virq_disabled. After
@ -312,7 +310,7 @@ static int vfio_intx_enable(struct vfio_pci_core_device *vdev,
vdev->irq_type = VFIO_PCI_INTX_IRQ_INDEX;
ret = request_irq(pdev->irq, vfio_intx_handler,
irqflags, ctx->name, vdev);
irqflags, ctx->name, ctx);
if (ret) {
vdev->irq_type = VFIO_PCI_NUM_IRQS;
kfree(name);
@ -358,7 +356,7 @@ static void vfio_intx_disable(struct vfio_pci_core_device *vdev)
if (ctx) {
vfio_virqfd_disable(&ctx->unmask);
vfio_virqfd_disable(&ctx->mask);
free_irq(pdev->irq, vdev);
free_irq(pdev->irq, ctx);
if (ctx->trigger)
eventfd_ctx_put(ctx->trigger);
kfree(ctx->name);