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From: Rob Herring <robh@kernel.org>
To: Viresh Kumar <viresh.kumar@linaro.org>
Cc: "Jason Wang" <jasowang@redhat.com>,
	"Michael S. Tsirkin" <mst@redhat.com>,
	"Arnd Bergmann" <arnd@kernel.org>,
	"Jean-Philippe Brucker" <jean-philippe@linaro.org>,
	"Linus Walleij" <linus.walleij@linaro.org>,
	"Bartosz Golaszewski" <bgolaszewski@baylibre.com>,
	"Vincent Guittot" <vincent.guittot@linaro.org>,
	"Bill Mills" <bill.mills@linaro.org>,
	"Alex Bennée" <alex.bennee@linaro.org>,
	"Enrico Weigelt, metux IT consult" <info@metux.net>,
	"Jie Deng" <jie.deng@intel.com>,
	devicetree@vger.kernel.org,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"open list:DRM DRIVER FOR QEMU'S CIRRUS DEVICE"
	<virtualization@lists.linux-foundation.org>,
	"Arnd Bergmann" <arnd@arndb.de>,
	"open list:GPIO SUBSYSTEM" <linux-gpio@vger.kernel.org>
Subject: Re: [PATCH V4 3/5] dt-bindings: gpio: Add bindings for gpio-virtio
Date: Tue, 3 Aug 2021 09:47:42 -0600	[thread overview]
Message-ID: <CAL_JsqJ6_ktTQKiy_xx9DhjQ3=imfvSZpBem5fXwVY7O49EgCw@mail.gmail.com> (raw)
In-Reply-To: <20210803043014.paskwghdio6azplp@vireshk-i7>

n Mon, Aug 2, 2021 at 10:30 PM Viresh Kumar <viresh.kumar@linaro.org> wrote:
>
> On 02-08-21, 13:40, Rob Herring wrote:
> > Humm, how does one implement interrupts without a parent interrupt? It
> > uses the parent virtio,mmio interrupt?
>
> Kind of, yeah, but not necessarily.
>
> The interrupt information is passed over buffers shared between host and guest.
> Now the guest may process the buffers when it receives a notification from the
> host, that will be at downpath of an interrupt for virtio,mmio. Or the guest may
> poll on the virtqueue and process any buffers as soon as they are made
> available, no interrupts then.

Okay, thanks for the explanation.

Reviewed-by: Rob Herring <robh@kernel.org>

Rob

WARNING: multiple messages have this Message-ID (diff)
From: Rob Herring <robh@kernel.org>
To: Viresh Kumar <viresh.kumar@linaro.org>
Cc: Arnd Bergmann <arnd@kernel.org>,
	Vincent Guittot <vincent.guittot@linaro.org>,
	Arnd Bergmann <arnd@arndb.de>,
	Jean-Philippe Brucker <jean-philippe@linaro.org>,
	"Enrico Weigelt, metux IT consult" <info@metux.net>,
	"Michael S. Tsirkin" <mst@redhat.com>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"open list:DRM DRIVER FOR QEMU'S CIRRUS DEVICE"
	<virtualization@lists.linux-foundation.org>,
	Bartosz Golaszewski <bgolaszewski@baylibre.com>,
	devicetree@vger.kernel.org,
	"open list:GPIO SUBSYSTEM" <linux-gpio@vger.kernel.org>,
	Linus Walleij <linus.walleij@linaro.org>,
	Bill Mills <bill.mills@linaro.org>
Subject: Re: [PATCH V4 3/5] dt-bindings: gpio: Add bindings for gpio-virtio
Date: Tue, 3 Aug 2021 09:47:42 -0600	[thread overview]
Message-ID: <CAL_JsqJ6_ktTQKiy_xx9DhjQ3=imfvSZpBem5fXwVY7O49EgCw@mail.gmail.com> (raw)
In-Reply-To: <20210803043014.paskwghdio6azplp@vireshk-i7>

n Mon, Aug 2, 2021 at 10:30 PM Viresh Kumar <viresh.kumar@linaro.org> wrote:
>
> On 02-08-21, 13:40, Rob Herring wrote:
> > Humm, how does one implement interrupts without a parent interrupt? It
> > uses the parent virtio,mmio interrupt?
>
> Kind of, yeah, but not necessarily.
>
> The interrupt information is passed over buffers shared between host and guest.
> Now the guest may process the buffers when it receives a notification from the
> host, that will be at downpath of an interrupt for virtio,mmio. Or the guest may
> poll on the virtqueue and process any buffers as soon as they are made
> available, no interrupts then.

Okay, thanks for the explanation.

Reviewed-by: Rob Herring <robh@kernel.org>

Rob
_______________________________________________
Virtualization mailing list
Virtualization@lists.linux-foundation.org
https://lists.linuxfoundation.org/mailman/listinfo/virtualization

  reply	other threads:[~2021-08-03 15:47 UTC|newest]

Thread overview: 33+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-27  5:23 [PATCH V4 0/5] virtio: Add virtio-device bindings Viresh Kumar
2021-07-27  5:23 ` Viresh Kumar
2021-07-27  5:23 ` [PATCH V4 1/5] dt-bindings: virtio: Add binding for virtio devices Viresh Kumar
2021-07-27  5:23   ` Viresh Kumar
2021-07-27  7:51   ` Arnd Bergmann
2021-08-02 19:40   ` Rob Herring
2021-08-02 19:40     ` Rob Herring
2021-07-27  5:23 ` [PATCH V4 2/5] dt-bindings: i2c: Add bindings for i2c-virtio Viresh Kumar
2021-07-27  5:23   ` Viresh Kumar
2021-08-02 19:41   ` Rob Herring
2021-08-02 19:41     ` Rob Herring
2021-07-27  5:23 ` [PATCH V4 3/5] dt-bindings: gpio: Add bindings for gpio-virtio Viresh Kumar
2021-07-27  5:23   ` Viresh Kumar
2021-08-02 19:40   ` Rob Herring
2021-08-02 19:40     ` Rob Herring
2021-08-03  4:30     ` Viresh Kumar
2021-08-03  4:30       ` Viresh Kumar
2021-08-03 15:47       ` Rob Herring [this message]
2021-08-03 15:47         ` Rob Herring
2021-08-04  3:49         ` Viresh Kumar
2021-08-04  3:49           ` Viresh Kumar
2021-07-27  5:23 ` [PATCH V4 4/5] uapi: virtio_ids: Sync ids with specification Viresh Kumar
2021-07-27  5:23   ` Viresh Kumar
2021-07-27  5:23 ` [PATCH V4 5/5] virtio: Bind virtio device to device-tree node Viresh Kumar
2021-07-27  5:23   ` Viresh Kumar
2021-08-04  3:56 ` [PATCH V4 0/5] virtio: Add virtio-device bindings Viresh Kumar
2021-08-04  3:56   ` Viresh Kumar
2021-08-11  5:38   ` Viresh Kumar
2021-08-11  5:38     ` Viresh Kumar
2021-08-31  5:31 ` Viresh Kumar
2021-08-31  5:31   ` Viresh Kumar
2021-08-31 14:25   ` Michael S. Tsirkin
2021-08-31 14:25     ` Michael S. Tsirkin

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