330 lines
6.9 KiB
C
330 lines
6.9 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* VFIO platform devices interrupt handling
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*
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* Copyright (C) 2013 - Virtual Open Systems
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* Author: Antonios Motakis <a.motakis@virtualopensystems.com>
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*/
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#include <linux/eventfd.h>
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#include <linux/interrupt.h>
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#include <linux/slab.h>
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#include <linux/types.h>
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#include <linux/vfio.h>
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#include <linux/irq.h>
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#include "vfio_platform_private.h"
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static void vfio_platform_mask(struct vfio_platform_irq *irq_ctx)
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{
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unsigned long flags;
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spin_lock_irqsave(&irq_ctx->lock, flags);
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if (!irq_ctx->masked) {
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disable_irq_nosync(irq_ctx->hwirq);
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irq_ctx->masked = true;
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}
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spin_unlock_irqrestore(&irq_ctx->lock, flags);
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}
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static int vfio_platform_mask_handler(void *opaque, void *unused)
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{
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struct vfio_platform_irq *irq_ctx = opaque;
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vfio_platform_mask(irq_ctx);
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return 0;
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}
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static int vfio_platform_set_irq_mask(struct vfio_platform_device *vdev,
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unsigned index, unsigned start,
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unsigned count, uint32_t flags,
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void *data)
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{
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if (start != 0 || count != 1)
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return -EINVAL;
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if (!(vdev->irqs[index].flags & VFIO_IRQ_INFO_MASKABLE))
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return -EINVAL;
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if (flags & VFIO_IRQ_SET_DATA_EVENTFD) {
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int32_t fd = *(int32_t *)data;
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if (fd >= 0)
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return vfio_virqfd_enable((void *) &vdev->irqs[index],
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vfio_platform_mask_handler,
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NULL, NULL,
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&vdev->irqs[index].mask, fd);
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vfio_virqfd_disable(&vdev->irqs[index].mask);
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return 0;
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}
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if (flags & VFIO_IRQ_SET_DATA_NONE) {
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vfio_platform_mask(&vdev->irqs[index]);
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} else if (flags & VFIO_IRQ_SET_DATA_BOOL) {
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uint8_t mask = *(uint8_t *)data;
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if (mask)
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vfio_platform_mask(&vdev->irqs[index]);
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}
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return 0;
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}
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static void vfio_platform_unmask(struct vfio_platform_irq *irq_ctx)
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{
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unsigned long flags;
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spin_lock_irqsave(&irq_ctx->lock, flags);
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if (irq_ctx->masked) {
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enable_irq(irq_ctx->hwirq);
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irq_ctx->masked = false;
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}
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spin_unlock_irqrestore(&irq_ctx->lock, flags);
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}
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static int vfio_platform_unmask_handler(void *opaque, void *unused)
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{
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struct vfio_platform_irq *irq_ctx = opaque;
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vfio_platform_unmask(irq_ctx);
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return 0;
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}
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static int vfio_platform_set_irq_unmask(struct vfio_platform_device *vdev,
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unsigned index, unsigned start,
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unsigned count, uint32_t flags,
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void *data)
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{
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if (start != 0 || count != 1)
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return -EINVAL;
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if (!(vdev->irqs[index].flags & VFIO_IRQ_INFO_MASKABLE))
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return -EINVAL;
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if (flags & VFIO_IRQ_SET_DATA_EVENTFD) {
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int32_t fd = *(int32_t *)data;
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if (fd >= 0)
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return vfio_virqfd_enable((void *) &vdev->irqs[index],
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vfio_platform_unmask_handler,
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NULL, NULL,
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&vdev->irqs[index].unmask,
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fd);
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vfio_virqfd_disable(&vdev->irqs[index].unmask);
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return 0;
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}
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if (flags & VFIO_IRQ_SET_DATA_NONE) {
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vfio_platform_unmask(&vdev->irqs[index]);
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} else if (flags & VFIO_IRQ_SET_DATA_BOOL) {
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uint8_t unmask = *(uint8_t *)data;
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if (unmask)
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vfio_platform_unmask(&vdev->irqs[index]);
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}
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return 0;
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}
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static irqreturn_t vfio_automasked_irq_handler(int irq, void *dev_id)
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{
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struct vfio_platform_irq *irq_ctx = dev_id;
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unsigned long flags;
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int ret = IRQ_NONE;
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spin_lock_irqsave(&irq_ctx->lock, flags);
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if (!irq_ctx->masked) {
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ret = IRQ_HANDLED;
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/* automask maskable interrupts */
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disable_irq_nosync(irq_ctx->hwirq);
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irq_ctx->masked = true;
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}
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spin_unlock_irqrestore(&irq_ctx->lock, flags);
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if (ret == IRQ_HANDLED)
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eventfd_signal(irq_ctx->trigger, 1);
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return ret;
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}
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static irqreturn_t vfio_irq_handler(int irq, void *dev_id)
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{
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struct vfio_platform_irq *irq_ctx = dev_id;
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eventfd_signal(irq_ctx->trigger, 1);
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return IRQ_HANDLED;
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}
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static int vfio_set_trigger(struct vfio_platform_device *vdev, int index,
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int fd, irq_handler_t handler)
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{
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struct vfio_platform_irq *irq = &vdev->irqs[index];
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struct eventfd_ctx *trigger;
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int ret;
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if (irq->trigger) {
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irq_clear_status_flags(irq->hwirq, IRQ_NOAUTOEN);
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free_irq(irq->hwirq, irq);
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kfree(irq->name);
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eventfd_ctx_put(irq->trigger);
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irq->trigger = NULL;
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}
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if (fd < 0) /* Disable only */
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return 0;
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irq->name = kasprintf(GFP_KERNEL, "vfio-irq[%d](%s)",
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irq->hwirq, vdev->name);
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if (!irq->name)
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return -ENOMEM;
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trigger = eventfd_ctx_fdget(fd);
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if (IS_ERR(trigger)) {
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kfree(irq->name);
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return PTR_ERR(trigger);
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}
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irq->trigger = trigger;
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irq_set_status_flags(irq->hwirq, IRQ_NOAUTOEN);
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ret = request_irq(irq->hwirq, handler, 0, irq->name, irq);
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if (ret) {
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kfree(irq->name);
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eventfd_ctx_put(trigger);
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irq->trigger = NULL;
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return ret;
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}
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if (!irq->masked)
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enable_irq(irq->hwirq);
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return 0;
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}
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static int vfio_platform_set_irq_trigger(struct vfio_platform_device *vdev,
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unsigned index, unsigned start,
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unsigned count, uint32_t flags,
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void *data)
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{
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struct vfio_platform_irq *irq = &vdev->irqs[index];
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irq_handler_t handler;
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if (vdev->irqs[index].flags & VFIO_IRQ_INFO_AUTOMASKED)
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handler = vfio_automasked_irq_handler;
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else
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handler = vfio_irq_handler;
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if (!count && (flags & VFIO_IRQ_SET_DATA_NONE))
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return vfio_set_trigger(vdev, index, -1, handler);
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if (start != 0 || count != 1)
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return -EINVAL;
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if (flags & VFIO_IRQ_SET_DATA_EVENTFD) {
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int32_t fd = *(int32_t *)data;
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return vfio_set_trigger(vdev, index, fd, handler);
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}
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if (flags & VFIO_IRQ_SET_DATA_NONE) {
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handler(irq->hwirq, irq);
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} else if (flags & VFIO_IRQ_SET_DATA_BOOL) {
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uint8_t trigger = *(uint8_t *)data;
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if (trigger)
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handler(irq->hwirq, irq);
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}
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return 0;
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}
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int vfio_platform_set_irqs_ioctl(struct vfio_platform_device *vdev,
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uint32_t flags, unsigned index, unsigned start,
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unsigned count, void *data)
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{
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int (*func)(struct vfio_platform_device *vdev, unsigned index,
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unsigned start, unsigned count, uint32_t flags,
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void *data) = NULL;
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switch (flags & VFIO_IRQ_SET_ACTION_TYPE_MASK) {
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case VFIO_IRQ_SET_ACTION_MASK:
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func = vfio_platform_set_irq_mask;
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break;
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case VFIO_IRQ_SET_ACTION_UNMASK:
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func = vfio_platform_set_irq_unmask;
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break;
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case VFIO_IRQ_SET_ACTION_TRIGGER:
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func = vfio_platform_set_irq_trigger;
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break;
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}
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if (!func)
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return -ENOTTY;
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return func(vdev, index, start, count, flags, data);
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}
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int vfio_platform_irq_init(struct vfio_platform_device *vdev)
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{
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int cnt = 0, i;
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while (vdev->get_irq(vdev, cnt) >= 0)
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cnt++;
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vdev->irqs = kcalloc(cnt, sizeof(struct vfio_platform_irq), GFP_KERNEL);
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if (!vdev->irqs)
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return -ENOMEM;
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for (i = 0; i < cnt; i++) {
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int hwirq = vdev->get_irq(vdev, i);
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if (hwirq < 0)
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goto err;
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spin_lock_init(&vdev->irqs[i].lock);
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vdev->irqs[i].flags = VFIO_IRQ_INFO_EVENTFD;
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if (irq_get_trigger_type(hwirq) & IRQ_TYPE_LEVEL_MASK)
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vdev->irqs[i].flags |= VFIO_IRQ_INFO_MASKABLE
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| VFIO_IRQ_INFO_AUTOMASKED;
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vdev->irqs[i].count = 1;
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vdev->irqs[i].hwirq = hwirq;
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vdev->irqs[i].masked = false;
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}
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vdev->num_irqs = cnt;
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return 0;
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err:
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kfree(vdev->irqs);
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return -EINVAL;
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}
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void vfio_platform_irq_cleanup(struct vfio_platform_device *vdev)
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{
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int i;
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for (i = 0; i < vdev->num_irqs; i++)
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vfio_set_trigger(vdev, i, -1, NULL);
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vdev->num_irqs = 0;
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kfree(vdev->irqs);
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}
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