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https://github.com/edk2-porting/linux-next.git
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9a36321c8d
This patch is a skeleton for the VFIO_DEVICE_SET_IRQS IOCTL, around which most IRQ functionality is implemented in VFIO. Signed-off-by: Antonios Motakis <a.motakis@virtualopensystems.com> Signed-off-by: Baptiste Reynal <b.reynal@virtualopensystems.com> Reviewed-by: Eric Auger <eric.auger@linaro.org> Tested-by: Eric Auger <eric.auger@linaro.org> Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
111 lines
2.6 KiB
C
111 lines
2.6 KiB
C
/*
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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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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License, version 2, as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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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 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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return -EINVAL;
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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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return -EINVAL;
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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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return -EINVAL;
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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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vdev->irqs[i].flags = 0;
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vdev->irqs[i].count = 1;
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vdev->irqs[i].hwirq = hwirq;
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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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vdev->num_irqs = 0;
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kfree(vdev->irqs);
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}
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