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Date: Fri, 31 Oct 2014 13:11:14 -0600
From: Alex Williamson <alex.williamson@...hat.com>
To: Antonios Motakis <a.motakis@...tualopensystems.com>
Cc: kvmarm@...ts.cs.columbia.edu, iommu@...ts.linux-foundation.org,
will.deacon@....com, tech@...tualopensystems.com,
christoffer.dall@...aro.org, eric.auger@...aro.org,
kim.phillips@...escale.com, marc.zyngier@....com,
open list <linux-kernel@...r.kernel.org>,
"open list:VFIO DRIVER" <kvm@...r.kernel.org>
Subject: Re: [PATCH v9 10/19] vfio/platform: return IRQ info
On Mon, 2014-10-27 at 19:07 +0100, Antonios Motakis wrote:
> Return information for the interrupts exposed by the device.
> This patch extends VFIO_DEVICE_GET_INFO with the number of IRQs
> and enables VFIO_DEVICE_GET_IRQ_INFO.
>
> Signed-off-by: Antonios Motakis <a.motakis@...tualopensystems.com>
> ---
> drivers/vfio/platform/Makefile | 2 +-
> drivers/vfio/platform/vfio_platform_common.c | 31 ++++++++++++--
> drivers/vfio/platform/vfio_platform_irq.c | 59 +++++++++++++++++++++++++++
> drivers/vfio/platform/vfio_platform_private.h | 10 +++++
> 4 files changed, 97 insertions(+), 5 deletions(-)
> create mode 100644 drivers/vfio/platform/vfio_platform_irq.c
>
> diff --git a/drivers/vfio/platform/Makefile b/drivers/vfio/platform/Makefile
> index 1957170..81de144 100644
> --- a/drivers/vfio/platform/Makefile
> +++ b/drivers/vfio/platform/Makefile
> @@ -1,5 +1,5 @@
>
> -vfio-platform-y := vfio_platform.o vfio_platform_common.o
> +vfio-platform-y := vfio_platform.o vfio_platform_common.o vfio_platform_irq.o
>
> obj-$(CONFIG_VFIO_PLATFORM) += vfio-platform.o
>
> diff --git a/drivers/vfio/platform/vfio_platform_common.c b/drivers/vfio/platform/vfio_platform_common.c
> index aeaaec9..5f2c205 100644
> --- a/drivers/vfio/platform/vfio_platform_common.c
> +++ b/drivers/vfio/platform/vfio_platform_common.c
> @@ -105,6 +105,7 @@ static void vfio_platform_release(void *device_data)
>
> if (!(--vdev->refcnt)) {
> vfio_platform_regions_cleanup(vdev);
> + vfio_platform_irq_cleanup(vdev);
> }
>
> mutex_unlock(&driver_lock);
> @@ -126,6 +127,10 @@ static int vfio_platform_open(void *device_data)
> ret = vfio_platform_regions_init(vdev);
> if (ret)
> goto err_reg;
> +
> + ret = vfio_platform_irq_init(vdev);
> + if (ret)
> + goto err_irq;
> }
>
> vdev->refcnt++;
> @@ -133,6 +138,8 @@ static int vfio_platform_open(void *device_data)
> mutex_unlock(&driver_lock);
> return 0;
>
> +err_irq:
> + vfio_platform_regions_cleanup(vdev);
> err_reg:
> mutex_unlock(&driver_lock);
> module_put(THIS_MODULE);
> @@ -158,7 +165,7 @@ static long vfio_platform_ioctl(void *device_data,
>
> info.flags = vdev->flags;
> info.num_regions = vdev->num_regions;
> - info.num_irqs = 0;
> + info.num_irqs = vdev->num_irqs;
>
> return copy_to_user((void __user *)arg, &info, minsz);
>
> @@ -183,10 +190,26 @@ static long vfio_platform_ioctl(void *device_data,
>
> return copy_to_user((void __user *)arg, &info, minsz);
>
> - } else if (cmd == VFIO_DEVICE_GET_IRQ_INFO)
> - return -EINVAL;
> + } else if (cmd == VFIO_DEVICE_GET_IRQ_INFO) {
> + struct vfio_irq_info info;
> +
> + minsz = offsetofend(struct vfio_irq_info, count);
> +
> + if (copy_from_user(&info, (void __user *)arg, minsz))
> + return -EFAULT;
> +
> + if (info.argsz < minsz)
> + return -EINVAL;
> +
> + if (info.index >= vdev->num_irqs)
> + return -EINVAL;
> +
> + info.flags = vdev->irqs[info.index].flags;
> + info.count = vdev->irqs[info.index].count;
> +
> + return copy_to_user((void __user *)arg, &info, minsz);
>
> - else if (cmd == VFIO_DEVICE_SET_IRQS)
> + } else if (cmd == VFIO_DEVICE_SET_IRQS)
> return -EINVAL;
>
> else if (cmd == VFIO_DEVICE_RESET)
> diff --git a/drivers/vfio/platform/vfio_platform_irq.c b/drivers/vfio/platform/vfio_platform_irq.c
> new file mode 100644
> index 0000000..d99c71c
> --- /dev/null
> +++ b/drivers/vfio/platform/vfio_platform_irq.c
> @@ -0,0 +1,59 @@
> +/*
> + * VFIO platform devices interrupt handling
> + *
> + * Copyright (C) 2013 - Virtual Open Systems
> + * Author: Antonios Motakis <a.motakis@...tualopensystems.com>
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License, version 2, as
> + * published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + */
> +
> +#include <linux/device.h>
> +#include <linux/eventfd.h>
> +#include <linux/interrupt.h>
> +#include <linux/iommu.h>
> +#include <linux/module.h>
> +#include <linux/mutex.h>
> +#include <linux/notifier.h>
> +#include <linux/pm_runtime.h>
> +#include <linux/slab.h>
> +#include <linux/types.h>
> +#include <linux/uaccess.h>
> +#include <linux/vfio.h>
> +#include <linux/platform_device.h>
> +#include <linux/irq.h>
> +
> +#include "vfio_platform_private.h"
> +
> +int vfio_platform_irq_init(struct vfio_platform_device *vdev)
> +{
> + int cnt = 0, i;
> +
> + while (vdev->get_irq(vdev, cnt) > 0)
For platform devices this is just a wrapper around platform_get_irq(),
which sort of seems like it can return 0 as a valid irq. Am I wrong
about that? If 0 can be valid, AMBA would need to update it's error
return value too.
> + cnt++;
> +
> + vdev->irqs = kcalloc(cnt, sizeof(struct vfio_platform_irq), GFP_KERNEL);
> + if (!vdev->irqs)
> + return -ENOMEM;
> +
> + for (i = 0; i < cnt; i++) {
> + vdev->irqs[i].flags = 0;
> + vdev->irqs[i].count = 1;
> + }
> +
> + vdev->num_irqs = cnt;
> +
> + return 0;
> +}
> +
> +void vfio_platform_irq_cleanup(struct vfio_platform_device *vdev)
> +{
> + vdev->num_irqs = 0;
> + kfree(vdev->irqs);
> +}
> diff --git a/drivers/vfio/platform/vfio_platform_private.h b/drivers/vfio/platform/vfio_platform_private.h
> index 1f251b2..3a29a72 100644
> --- a/drivers/vfio/platform/vfio_platform_private.h
> +++ b/drivers/vfio/platform/vfio_platform_private.h
> @@ -24,6 +24,11 @@
> #define VFIO_PLATFORM_INDEX_TO_OFFSET(index) \
> ((u64)(index) << VFIO_PLATFORM_OFFSET_SHIFT)
>
> +struct vfio_platform_irq {
> + u32 flags;
> + u32 count;
> +};
> +
> struct vfio_platform_region {
> u64 addr;
> resource_size_t size;
> @@ -37,6 +42,8 @@ struct vfio_platform_region {
> struct vfio_platform_device {
> struct vfio_platform_region *regions;
> u32 num_regions;
> + struct vfio_platform_irq *irqs;
> + u32 num_irqs;
> int refcnt;
>
> /*
> @@ -56,4 +63,7 @@ extern int vfio_platform_probe_common(struct vfio_platform_device *vdev,
> extern struct vfio_platform_device *vfio_platform_remove_common
> (struct device *dev);
>
> +extern int vfio_platform_irq_init(struct vfio_platform_device *vdev);
> +extern void vfio_platform_irq_cleanup(struct vfio_platform_device *vdev);
> +
> #endif /* VFIO_PLATFORM_PRIVATE_H */
--
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