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From: Alex Williamson <alex.williamson@redhat.com>
To: Tina Zhang <tina.zhang@intel.com>
Cc: intel-gvt-dev@lists.freedesktop.org, kraxel@redhat.com,
	kvm@vger.kernel.org, linux-kernel@vger.kernel.org,
	hang.yuan@intel.com, zhiyuan.lv@intel.com,
	Eric Auger <eric.auger@redhat.com>
Subject: Re: [PATCH v5 1/6] vfio: Define device specific irq type capability
Date: Fri, 16 Aug 2019 14:51:41 -0600
Message-ID: <20190816145141.6e56c6cb@x1.home> (raw)
In-Reply-To: <20190816023528.30210-2-tina.zhang@intel.com>

On Fri, 16 Aug 2019 10:35:23 +0800
Tina Zhang <tina.zhang@intel.com> wrote:

> Cap the number of irqs with fixed indexes and use capability chains
> to chain device specific irqs.
> 
> Signed-off-by: Tina Zhang <tina.zhang@intel.com>
> Signed-off-by: Eric Auger <eric.auger@redhat.com>
> ---
>  include/uapi/linux/vfio.h | 19 ++++++++++++++++++-
>  1 file changed, 18 insertions(+), 1 deletion(-)
> 
> diff --git a/include/uapi/linux/vfio.h b/include/uapi/linux/vfio.h
> index 02bb7ad6e986..d83c9f136a5b 100644
> --- a/include/uapi/linux/vfio.h
> +++ b/include/uapi/linux/vfio.h
> @@ -444,11 +444,27 @@ struct vfio_irq_info {
>  #define VFIO_IRQ_INFO_MASKABLE		(1 << 1)
>  #define VFIO_IRQ_INFO_AUTOMASKED	(1 << 2)
>  #define VFIO_IRQ_INFO_NORESIZE		(1 << 3)
> +#define VFIO_IRQ_INFO_FLAG_CAPS		(1 << 4) /* Info supports caps */
>  	__u32	index;		/* IRQ index */
>  	__u32	count;		/* Number of IRQs within this index */
> +	__u32	cap_offset;	/* Offset within info struct of first cap */
>  };
>  #define VFIO_DEVICE_GET_IRQ_INFO	_IO(VFIO_TYPE, VFIO_BASE + 9)
>  
> +/*
> + * The irq type capability allows irqs unique to a specific device or
> + * class of devices to be exposed.
> + *
> + * The structures below define version 1 of this capability.
> + */
> +#define VFIO_IRQ_INFO_CAP_TYPE      3

Why 3?  What's using 1 and 2 of this newly defined info cap ID?  Thanks,

Alex

> +
> +struct vfio_irq_info_cap_type {
> +	struct vfio_info_cap_header header;
> +	__u32 type;     /* global per bus driver */
> +	__u32 subtype;  /* type specific */
> +};
> +
>  /**
>   * VFIO_DEVICE_SET_IRQS - _IOW(VFIO_TYPE, VFIO_BASE + 10, struct vfio_irq_set)
>   *
> @@ -550,7 +566,8 @@ enum {
>  	VFIO_PCI_MSIX_IRQ_INDEX,
>  	VFIO_PCI_ERR_IRQ_INDEX,
>  	VFIO_PCI_REQ_IRQ_INDEX,
> -	VFIO_PCI_NUM_IRQS
> +	VFIO_PCI_NUM_IRQS = 5	/* Fixed user ABI, IRQ indexes >=5 use   */
> +				/* device specific cap to define content */
>  };
>  
>  /*


  reply index

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-08-16  2:35 [PATCH v5 0/6] Deliver vGPU display refresh event to userspace Tina Zhang
2019-08-16  2:35 ` [PATCH v5 1/6] vfio: Define device specific irq type capability Tina Zhang
2019-08-16 20:51   ` Alex Williamson [this message]
2019-08-20  0:56     ` Zhang, Tina
2019-08-16  2:35 ` [PATCH v5 2/6] vfio: Introduce vGPU display irq type Tina Zhang
2019-08-16 20:51   ` Alex Williamson
2019-08-20  2:12     ` Zhang, Tina
2019-08-20  7:20       ` kraxel
2019-08-20 15:03         ` Alex Williamson
2019-08-20 15:32       ` Alex Williamson
2019-08-16  2:35 ` [PATCH v5 3/6] drm/i915/gvt: Register vGPU display event irq Tina Zhang
2019-08-16  2:35 ` [PATCH v5 4/6] drm/i915/gvt: Deliver vGPU refresh event to userspace Tina Zhang
2019-08-26  7:55   ` Zhenyu Wang
2019-08-28  1:49     ` Tian, Kevin
2019-08-28  6:59       ` Zhang, Tina
2019-08-28  7:10         ` Tian, Kevin
2019-08-28  7:39           ` Zhang, Tina
2019-08-16  2:35 ` [PATCH v5 5/6] drm/i915/gvt: Deliver async primary plane page flip events at vblank Tina Zhang
2019-08-16  2:35 ` [PATCH v5 6/6] drm/i915/gvt: Add cursor plane reg update trap emulation handler Tina Zhang
2019-09-03  1:26 ` [PATCH v5 0/6] Deliver vGPU display refresh event to userspace Zhang, Tina
2019-09-03  7:43   ` Tian, Kevin
2019-09-05  7:48   ` kraxel
2019-09-17  9:27     ` Zhang, Tina

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