On 2021/3/3 17:38, Viresh Kumar wrote:
On 03-03-21, 16:46, Jie Deng wrote:
This is not a problem. My original proposal was to mirror the struct
i2c_msg.
The code you looked at was based on that.
However, the virtio TC prefer not to mirror it. They have some concerns.
For example, there is a bi
On Tue, Mar 02, 2021 at 11:54:02AM +0100, Arnd Bergmann wrote:
> On Tue, Mar 2, 2021 at 10:51 AM Stefan Hajnoczi wrote:
> > On Tue, Mar 02, 2021 at 10:42:06AM +0800, Jie Deng wrote:
> > > > > +/*
> > > > > + * Definitions for virtio I2C Adpter
> > > > > + *
> > > > > + * Copyright (c) 2021 Intel C
On 2021/3/3 15:54, Viresh Kumar wrote:
On 01-03-21, 14:41, Jie Deng wrote:
diff --git a/drivers/i2c/busses/i2c-virtio.c b/drivers/i2c/busses/i2c-virtio.c
+static int virtio_i2c_send_reqs(struct virtqueue *vq,
+ struct virtio_i2c_req *reqs,
+
On 03-03-21, 16:46, Jie Deng wrote:
> This is not a problem. My original proposal was to mirror the struct
> i2c_msg.
> The code you looked at was based on that.
> However, the virtio TC prefer not to mirror it. They have some concerns.
> For example, there is a bit I2C_M_RD in i2c_msg.flag which h
On 01-03-21, 14:41, Jie Deng wrote:
> diff --git a/drivers/i2c/busses/i2c-virtio.c b/drivers/i2c/busses/i2c-virtio.c
> +static int virtio_i2c_send_reqs(struct virtqueue *vq,
> + struct virtio_i2c_req *reqs,
> + struct i2c_msg *msgs, int nr)
>
On Tue, Mar 2, 2021 at 10:51 AM Stefan Hajnoczi wrote:
> On Tue, Mar 02, 2021 at 10:42:06AM +0800, Jie Deng wrote:
> > > > +/*
> > > > + * Definitions for virtio I2C Adpter
> > > > + *
> > > > + * Copyright (c) 2021 Intel Corporation. All rights reserved.
> > > > + */
> > > > +
> > > > +#ifndef _U
On Tue, Mar 02, 2021 at 10:42:06AM +0800, Jie Deng wrote:
>
> On 2021/3/1 23:19, Arnd Bergmann wrote:
> > On Mon, Mar 1, 2021 at 7:41 AM Jie Deng wrote:
> >
> > > --- /dev/null
> > > +++ b/include/uapi/linux/virtio_i2c.h
> > > @@ -0,0 +1,56 @@
> > > +/* SPDX-License-Identifier: GPL-2.0-or-later
On 2021/3/2 15:24, Viresh Kumar wrote:
On 02-03-21, 14:24, Jie Deng wrote:
Not for the full duplex. As Paolo explained in those links.
We defined a combined request called "write-read request"
"
This is when a write is followed by a read: the master
starts off the transmission with a write, t
On 02-03-21, 14:24, Jie Deng wrote:
> Not for the full duplex. As Paolo explained in those links.
> We defined a combined request called "write-read request"
>
> "
> This is when a write is followed by a read: the master
> starts off the transmission with a write, then sends a second START,
> then
On 2021/3/1 20:07, Andy Shevchenko wrote:
On Mon, Mar 01, 2021 at 02:41:35PM +0800, Jie Deng wrote:
Add an I2C bus driver for virtio para-virtualization.
The controller can be emulated by the backend driver in
any device model software by following the virtio protocol.
The device specificati
On 2021/3/2 11:43, Viresh Kumar wrote:
On 02-03-21, 10:21, Jie Deng wrote:
On 2021/3/1 19:54, Viresh Kumar wrote:
That's my original proposal. I used to mirror this interface with "struct
i2c_msg".
But the design philosophy of virtio TC is that VIRTIO devices are not
specific to Linux
so the
On 2021/3/2 1:16 下午, Viresh Kumar wrote:
On 02-03-21, 13:06, Jie Deng wrote:
Yeah. Actually, the backend only needs "struct virtio_i2c_out_hdr out_hdr"
and "struct virtio_i2c_in_hdr in_hdr" for communication. So we only need to
keep
the first two in uapi and move "struct virtio_i2c_req" into t
On 2021/3/2 12:42, Viresh Kumar wrote:
On 01-03-21, 14:41, Jie Deng wrote:
+static int virtio_i2c_send_reqs(struct virtqueue *vq,
+ struct virtio_i2c_req *reqs,
+ struct i2c_msg *msgs, int nr)
+{
+ struct scatterlist *sgs[3], ou
On 02-03-21, 13:21, Jie Deng wrote:
>
> On 2021/3/2 12:42, Viresh Kumar wrote:
> > On 01-03-21, 14:41, Jie Deng wrote:
> > > +static int virtio_i2c_send_reqs(struct virtqueue *vq,
> > > + struct virtio_i2c_req *reqs,
> > > + struct i2c_msg *msgs, int
On 02-03-21, 13:06, Jie Deng wrote:
> Yeah. Actually, the backend only needs "struct virtio_i2c_out_hdr out_hdr"
> and "struct virtio_i2c_in_hdr in_hdr" for communication. So we only need to
> keep
> the first two in uapi and move "struct virtio_i2c_req" into the driver.
>
> But Jason wanted to in
On 2021/3/2 12:22, Viresh Kumar wrote:
On 02-03-21, 09:31, Viresh Kumar wrote:
On 01-03-21, 16:19, Arnd Bergmann wrote:
On Mon, Mar 1, 2021 at 7:41 AM Jie Deng wrote:
--- /dev/null
+++ b/include/uapi/linux/virtio_i2c.h
@@ -0,0 +1,56 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later WITH Lin
On 01-03-21, 14:41, Jie Deng wrote:
> +static int virtio_i2c_send_reqs(struct virtqueue *vq,
> + struct virtio_i2c_req *reqs,
> + struct i2c_msg *msgs, int nr)
> +{
> + struct scatterlist *sgs[3], out_hdr, msg_buf, in_hdr;
> + int i, o
On 02-03-21, 09:31, Viresh Kumar wrote:
> On 01-03-21, 16:19, Arnd Bergmann wrote:
> > On Mon, Mar 1, 2021 at 7:41 AM Jie Deng wrote:
> >
> > > --- /dev/null
> > > +++ b/include/uapi/linux/virtio_i2c.h
> > > @@ -0,0 +1,56 @@
> > > +/* SPDX-License-Identifier: GPL-2.0-or-later WITH Linux-syscall-n
On 01-03-21, 16:19, Arnd Bergmann wrote:
> On Mon, Mar 1, 2021 at 7:41 AM Jie Deng wrote:
>
> > --- /dev/null
> > +++ b/include/uapi/linux/virtio_i2c.h
> > @@ -0,0 +1,56 @@
> > +/* SPDX-License-Identifier: GPL-2.0-or-later WITH Linux-syscall-note */
> > +/*
> > + * Definitions for virtio I2C Adpt
On 01-03-21, 16:46, Arnd Bergmann wrote:
> But the driver does not support this at all: the sglist always has three
> members as Viresh says: outhdr, msgbuf and inhdr. It then uses a
> bounce buffer for the actual data transfer, and this always goes either
> one way or the other.
Yes and if the dr
On 01-03-21, 14:10, Andy Shevchenko wrote:
> On Mon, Mar 01, 2021 at 02:09:25PM +0200, Andy Shevchenko wrote:
> > On Mon, Mar 01, 2021 at 05:24:41PM +0530, Viresh Kumar wrote:
> > > On 01-03-21, 14:41, Jie Deng wrote:
> > > > +/**
> > > > + * struct virtio_i2c_req - the virtio I2C request structure
On 02-03-21, 10:21, Jie Deng wrote:
> On 2021/3/1 19:54, Viresh Kumar wrote:
> That's my original proposal. I used to mirror this interface with "struct
> i2c_msg".
>
> But the design philosophy of virtio TC is that VIRTIO devices are not
> specific to Linux
> so the specs design should avoid the
On 2021/3/1 19:54, Viresh Kumar wrote:
On 01-03-21, 14:41, Jie Deng wrote:
+/**
+ * struct virtio_i2c_req - the virtio I2C request structure
+ * @out_hdr: the OUT header of the virtio I2C message
+ * @write_buf: contains one I2C segment being written to the device
+ * @read_buf: contains one I
On Mon, Mar 1, 2021 at 1:10 PM Andy Shevchenko
wrote:
> On Mon, Mar 01, 2021 at 02:09:25PM +0200, Andy Shevchenko wrote:
> > On Mon, Mar 01, 2021 at 05:24:41PM +0530, Viresh Kumar wrote:
> > > On 01-03-21, 14:41, Jie Deng wrote:
> > > > +/**
> > > > + * struct virtio_i2c_req - the virtio I2C reque
On Mon, Mar 1, 2021 at 7:41 AM Jie Deng wrote:
> --- /dev/null
> +++ b/include/uapi/linux/virtio_i2c.h
> @@ -0,0 +1,56 @@
> +/* SPDX-License-Identifier: GPL-2.0-or-later WITH Linux-syscall-note */
> +/*
> + * Definitions for virtio I2C Adpter
> + *
> + * Copyright (c) 2021 Intel Corporation. All
On Mon, Mar 01, 2021 at 02:41:35PM +0800, Jie Deng wrote:
> Add an I2C bus driver for virtio para-virtualization.
>
> The controller can be emulated by the backend driver in
> any device model software by following the virtio protocol.
>
> The device specification can be found on
> https://lists.
On Mon, Mar 01, 2021 at 05:24:41PM +0530, Viresh Kumar wrote:
> On 01-03-21, 14:41, Jie Deng wrote:
> > +/**
> > + * struct virtio_i2c_req - the virtio I2C request structure
> > + * @out_hdr: the OUT header of the virtio I2C message
> > + * @write_buf: contains one I2C segment being written to the
On Mon, Mar 01, 2021 at 02:09:25PM +0200, Andy Shevchenko wrote:
> On Mon, Mar 01, 2021 at 05:24:41PM +0530, Viresh Kumar wrote:
> > On 01-03-21, 14:41, Jie Deng wrote:
> > > +/**
> > > + * struct virtio_i2c_req - the virtio I2C request structure
> > > + * @out_hdr: the OUT header of the virtio I2C
On 01-03-21, 14:41, Jie Deng wrote:
> +/**
> + * struct virtio_i2c_req - the virtio I2C request structure
> + * @out_hdr: the OUT header of the virtio I2C message
> + * @write_buf: contains one I2C segment being written to the device
> + * @read_buf: contains one I2C segment being read from the dev
Add an I2C bus driver for virtio para-virtualization.
The controller can be emulated by the backend driver in
any device model software by following the virtio protocol.
The device specification can be found on
https://lists.oasis-open.org/archives/virtio-comment/202101/msg8.html.
By followi
30 matches
Mail list logo
