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This patch tries to make sure the virtio interrupt handler for INTX won't be called after a reset and before virtio_device_ready(). We can't use IRQF_NO_AUTOEN since we're using shared interrupt (IRQF_SHARED). So this patch tracks the INTX enabling status in a new intx_soft_enabled variable and toggle it during in vp_disable/enable_vectors(). The INTX interrupt handler will check intx_soft_enabled before processing the actual interrupt. Cc: Boqun Feng <boqun.feng@gmail.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Paul E. McKenney <paulmck@kernel.org> Signed-off-by: Jason Wang <jasowang@redhat.com> Link: https://lore.kernel.org/r/20211019070152.8236-6-jasowang@redhat.com Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
145 lines
4.2 KiB
C
145 lines
4.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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#ifndef _DRIVERS_VIRTIO_VIRTIO_PCI_COMMON_H
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#define _DRIVERS_VIRTIO_VIRTIO_PCI_COMMON_H
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/*
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* Virtio PCI driver - APIs for common functionality for all device versions
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*
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* This module allows virtio devices to be used over a virtual PCI device.
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* This can be used with QEMU based VMMs like KVM or Xen.
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*
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* Copyright IBM Corp. 2007
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* Copyright Red Hat, Inc. 2014
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*
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* Authors:
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* Anthony Liguori <aliguori@us.ibm.com>
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* Rusty Russell <rusty@rustcorp.com.au>
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* Michael S. Tsirkin <mst@redhat.com>
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*/
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#include <linux/module.h>
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#include <linux/list.h>
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#include <linux/pci.h>
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#include <linux/slab.h>
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#include <linux/interrupt.h>
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#include <linux/virtio.h>
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#include <linux/virtio_config.h>
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#include <linux/virtio_ring.h>
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#include <linux/virtio_pci.h>
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#include <linux/virtio_pci_legacy.h>
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#include <linux/virtio_pci_modern.h>
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#include <linux/highmem.h>
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#include <linux/spinlock.h>
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struct virtio_pci_vq_info {
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/* the actual virtqueue */
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struct virtqueue *vq;
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/* the list node for the virtqueues list */
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struct list_head node;
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/* MSI-X vector (or none) */
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unsigned msix_vector;
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};
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/* Our device structure */
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struct virtio_pci_device {
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struct virtio_device vdev;
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struct pci_dev *pci_dev;
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struct virtio_pci_legacy_device ldev;
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struct virtio_pci_modern_device mdev;
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bool is_legacy;
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/* Where to read and clear interrupt */
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u8 __iomem *isr;
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/* a list of queues so we can dispatch IRQs */
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spinlock_t lock;
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struct list_head virtqueues;
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/* array of all queues for house-keeping */
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struct virtio_pci_vq_info **vqs;
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/* MSI-X support */
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int msix_enabled;
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int intx_enabled;
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bool intx_soft_enabled;
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cpumask_var_t *msix_affinity_masks;
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/* Name strings for interrupts. This size should be enough,
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* and I'm too lazy to allocate each name separately. */
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char (*msix_names)[256];
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/* Number of available vectors */
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unsigned msix_vectors;
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/* Vectors allocated, excluding per-vq vectors if any */
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unsigned msix_used_vectors;
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/* Whether we have vector per vq */
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bool per_vq_vectors;
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struct virtqueue *(*setup_vq)(struct virtio_pci_device *vp_dev,
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struct virtio_pci_vq_info *info,
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unsigned idx,
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void (*callback)(struct virtqueue *vq),
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const char *name,
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bool ctx,
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u16 msix_vec);
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void (*del_vq)(struct virtio_pci_vq_info *info);
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u16 (*config_vector)(struct virtio_pci_device *vp_dev, u16 vector);
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};
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/* Constants for MSI-X */
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/* Use first vector for configuration changes, second and the rest for
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* virtqueues Thus, we need at least 2 vectors for MSI. */
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enum {
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VP_MSIX_CONFIG_VECTOR = 0,
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VP_MSIX_VQ_VECTOR = 1,
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};
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/* Convert a generic virtio device to our structure */
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static struct virtio_pci_device *to_vp_device(struct virtio_device *vdev)
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{
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return container_of(vdev, struct virtio_pci_device, vdev);
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}
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/* disable irq handlers */
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void vp_disable_cbs(struct virtio_device *vdev);
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/* enable irq handlers */
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void vp_enable_cbs(struct virtio_device *vdev);
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/* the notify function used when creating a virt queue */
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bool vp_notify(struct virtqueue *vq);
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/* the config->del_vqs() implementation */
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void vp_del_vqs(struct virtio_device *vdev);
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/* the config->find_vqs() implementation */
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int vp_find_vqs(struct virtio_device *vdev, unsigned nvqs,
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struct virtqueue *vqs[], vq_callback_t *callbacks[],
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const char * const names[], const bool *ctx,
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struct irq_affinity *desc);
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const char *vp_bus_name(struct virtio_device *vdev);
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/* Setup the affinity for a virtqueue:
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* - force the affinity for per vq vector
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* - OR over all affinities for shared MSI
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* - ignore the affinity request if we're using INTX
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*/
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int vp_set_vq_affinity(struct virtqueue *vq, const struct cpumask *cpu_mask);
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const struct cpumask *vp_get_vq_affinity(struct virtio_device *vdev, int index);
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#if IS_ENABLED(CONFIG_VIRTIO_PCI_LEGACY)
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int virtio_pci_legacy_probe(struct virtio_pci_device *);
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void virtio_pci_legacy_remove(struct virtio_pci_device *);
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#else
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static inline int virtio_pci_legacy_probe(struct virtio_pci_device *vp_dev)
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{
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return -ENODEV;
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}
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static inline void virtio_pci_legacy_remove(struct virtio_pci_device *vp_dev)
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{
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}
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#endif
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int virtio_pci_modern_probe(struct virtio_pci_device *);
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void virtio_pci_modern_remove(struct virtio_pci_device *);
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#endif
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