2022-06-23 16:09:50

by Eugenio Perez Martin

Subject: [PATCH v6 1/4] vdpa: Add suspend operation

This operation is optional: It it's not implemented, backend feature bit
will not be exposed.

Signed-off-by: Eugenio Pérez <[email protected]>
---
include/linux/vdpa.h | 4 ++++
1 file changed, 4 insertions(+)

diff --git a/include/linux/vdpa.h b/include/linux/vdpa.h
index 7b4a13d3bd91..d282f464d2f1 100644
--- a/include/linux/vdpa.h
+++ b/include/linux/vdpa.h
@@ -218,6 +218,9 @@ struct vdpa_map_file {
* @reset: Reset device
* @vdev: vdpa device
* Returns integer: success (0) or error (< 0)
+ * @suspend: Suspend or resume the device (optional)
+ * @vdev: vdpa device
+ * Returns integer: success (0) or error (< 0)
* @get_config_size: Get the size of the configuration space includes
* fields that are conditional on feature bits.
* @vdev: vdpa device
@@ -319,6 +322,7 @@ struct vdpa_config_ops {
u8 (*get_status)(struct vdpa_device *vdev);
void (*set_status)(struct vdpa_device *vdev, u8 status);
int (*reset)(struct vdpa_device *vdev);
+ int (*suspend)(struct vdpa_device *vdev);
size_t (*get_config_size)(struct vdpa_device *vdev);
void (*get_config)(struct vdpa_device *vdev, unsigned int offset,
void *buf, unsigned int len);
--
2.31.1

2022-06-28 13:57:45

by Stefano Garzarella

Subject: Re: [PATCH v6 1/4] vdpa: Add suspend operation

On Thu, Jun 23, 2022 at 06:07:35PM +0200, Eugenio P?rez wrote:
>This operation is optional: It it's not implemented, backend feature bit
>will not be exposed.
>
>Signed-off-by: Eugenio P?rez <[email protected]>
>---
> include/linux/vdpa.h | 4 ++++
> 1 file changed, 4 insertions(+)
>
>diff --git a/include/linux/vdpa.h b/include/linux/vdpa.h
>index 7b4a13d3bd91..d282f464d2f1 100644
>--- a/include/linux/vdpa.h
>+++ b/include/linux/vdpa.h
>@@ -218,6 +218,9 @@ struct vdpa_map_file {
> * @reset: Reset device
> * @vdev: vdpa device
> * Returns integer: success (0) or error (< 0)
>+ * @suspend: Suspend or resume the device (optional)
^
IIUC we removed the resume operation (that should be done with reset),
so should we update this documentation?

Thanks,
Stefano

>+ * @vdev: vdpa device
>+ * Returns integer: success (0) or error (< 0)
> * @get_config_size: Get the size of the configuration space includes
> * fields that are conditional on feature bits.
> * @vdev: vdpa device
>@@ -319,6 +322,7 @@ struct vdpa_config_ops {
> u8 (*get_status)(struct vdpa_device *vdev);
> void (*set_status)(struct vdpa_device *vdev, u8 status);
> int (*reset)(struct vdpa_device *vdev);
>+ int (*suspend)(struct vdpa_device *vdev);
> size_t (*get_config_size)(struct vdpa_device *vdev);
> void (*get_config)(struct vdpa_device *vdev, unsigned int offset,
> void *buf, unsigned int len);
>--
>2.31.1
>

2022-06-29 04:14:21

by Jason Wang

Subject: Re: [PATCH v6 1/4] vdpa: Add suspend operation

On Fri, Jun 24, 2022 at 12:07 AM Eugenio Pérez <[email protected]> wrote:
>
> This operation is optional: It it's not implemented, backend feature bit
> will not be exposed.

A question, do we allow suspending a device without DRIVER_OK?

Thanks

>
> Signed-off-by: Eugenio Pérez <[email protected]>
> ---
> include/linux/vdpa.h | 4 ++++
> 1 file changed, 4 insertions(+)
>
> diff --git a/include/linux/vdpa.h b/include/linux/vdpa.h
> index 7b4a13d3bd91..d282f464d2f1 100644
> --- a/include/linux/vdpa.h
> +++ b/include/linux/vdpa.h
> @@ -218,6 +218,9 @@ struct vdpa_map_file {
> * @reset: Reset device
> * @vdev: vdpa device
> * Returns integer: success (0) or error (< 0)
> + * @suspend: Suspend or resume the device (optional)
> + * @vdev: vdpa device
> + * Returns integer: success (0) or error (< 0)
> * @get_config_size: Get the size of the configuration space includes
> * fields that are conditional on feature bits.
> * @vdev: vdpa device
> @@ -319,6 +322,7 @@ struct vdpa_config_ops {
> u8 (*get_status)(struct vdpa_device *vdev);
> void (*set_status)(struct vdpa_device *vdev, u8 status);
> int (*reset)(struct vdpa_device *vdev);
> + int (*suspend)(struct vdpa_device *vdev);
> size_t (*get_config_size)(struct vdpa_device *vdev);
> void (*get_config)(struct vdpa_device *vdev, unsigned int offset,
> void *buf, unsigned int len);
> --
> 2.31.1
>

2022-07-08 11:57:05

by Eugenio Perez Martin

Subject: Re: [PATCH v6 1/4] vdpa: Add suspend operation

On Wed, Jun 29, 2022 at 6:10 AM Jason Wang <[email protected]> wrote:
>
> On Fri, Jun 24, 2022 at 12:07 AM Eugenio Pérez <[email protected]> wrote:
> >
> > This operation is optional: It it's not implemented, backend feature bit
> > will not be exposed.
>
> A question, do we allow suspending a device without DRIVER_OK?
>

That should be invalid. In particular, vdpa_sim will resume in that
case, but I guess it would depend on the device.

Do you think it should be controlled in the vdpa frontend code?

Thanks!

> Thanks
>
> >
> > Signed-off-by: Eugenio Pérez <[email protected]>
> > ---
> > include/linux/vdpa.h | 4 ++++
> > 1 file changed, 4 insertions(+)
> >
> > diff --git a/include/linux/vdpa.h b/include/linux/vdpa.h
> > index 7b4a13d3bd91..d282f464d2f1 100644
> > --- a/include/linux/vdpa.h
> > +++ b/include/linux/vdpa.h
> > @@ -218,6 +218,9 @@ struct vdpa_map_file {
> > * @reset: Reset device
> > * @vdev: vdpa device
> > * Returns integer: success (0) or error (< 0)
> > + * @suspend: Suspend or resume the device (optional)
> > + * @vdev: vdpa device
> > + * Returns integer: success (0) or error (< 0)
> > * @get_config_size: Get the size of the configuration space includes
> > * fields that are conditional on feature bits.
> > * @vdev: vdpa device
> > @@ -319,6 +322,7 @@ struct vdpa_config_ops {
> > u8 (*get_status)(struct vdpa_device *vdev);
> > void (*set_status)(struct vdpa_device *vdev, u8 status);
> > int (*reset)(struct vdpa_device *vdev);
> > + int (*suspend)(struct vdpa_device *vdev);
> > size_t (*get_config_size)(struct vdpa_device *vdev);
> > void (*get_config)(struct vdpa_device *vdev, unsigned int offset,
> > void *buf, unsigned int len);
> > --
> > 2.31.1
> >
>

2022-07-08 11:58:15

by Eugenio Perez Martin

Subject: Re: [PATCH v6 1/4] vdpa: Add suspend operation

On Tue, Jun 28, 2022 at 3:40 PM Stefano Garzarella <[email protected]> wrote:
>
> On Thu, Jun 23, 2022 at 06:07:35PM +0200, Eugenio Pérez wrote:
> >This operation is optional: It it's not implemented, backend feature bit
> >will not be exposed.
> >
> >Signed-off-by: Eugenio Pérez <[email protected]>
> >---
> > include/linux/vdpa.h | 4 ++++
> > 1 file changed, 4 insertions(+)
> >
> >diff --git a/include/linux/vdpa.h b/include/linux/vdpa.h
> >index 7b4a13d3bd91..d282f464d2f1 100644
> >--- a/include/linux/vdpa.h
> >+++ b/include/linux/vdpa.h
> >@@ -218,6 +218,9 @@ struct vdpa_map_file {
> > * @reset: Reset device
> > * @vdev: vdpa device
> > * Returns integer: success (0) or error (< 0)
> >+ * @suspend: Suspend or resume the device (optional)
> ^
> IIUC we removed the resume operation (that should be done with reset),
> so should we update this documentation?
>

Totally, I forgot to update the doc. I'll send a new version with that.

Thanks!


> Thanks,
> Stefano
>
> >+ * @vdev: vdpa device
> >+ * Returns integer: success (0) or error (< 0)
> > * @get_config_size: Get the size of the configuration space includes
> > * fields that are conditional on feature bits.
> > * @vdev: vdpa device
> >@@ -319,6 +322,7 @@ struct vdpa_config_ops {
> > u8 (*get_status)(struct vdpa_device *vdev);
> > void (*set_status)(struct vdpa_device *vdev, u8 status);
> > int (*reset)(struct vdpa_device *vdev);
> >+ int (*suspend)(struct vdpa_device *vdev);
> > size_t (*get_config_size)(struct vdpa_device *vdev);
> > void (*get_config)(struct vdpa_device *vdev, unsigned int offset,
> > void *buf, unsigned int len);
> >--
> >2.31.1
> >
>

2022-07-12 08:45:01

by Jason Wang

Subject: Re: [PATCH v6 1/4] vdpa: Add suspend operation

On Fri, Jul 8, 2022 at 7:31 PM Eugenio Perez Martin <[email protected]> wrote:
>
> On Wed, Jun 29, 2022 at 6:10 AM Jason Wang <[email protected]> wrote:
> >
> > On Fri, Jun 24, 2022 at 12:07 AM Eugenio Pérez <[email protected]> wrote:
> > >
> > > This operation is optional: It it's not implemented, backend feature bit
> > > will not be exposed.
> >
> > A question, do we allow suspending a device without DRIVER_OK?
> >
>
> That should be invalid. In particular, vdpa_sim will resume in that
> case, but I guess it would depend on the device.

Yes, and that will match our virtio spec patch (STOP bit).

>
> Do you think it should be controlled in the vdpa frontend code?

The vdpa bus should validate this at least.

Thanks

>
> Thanks!
>
> > Thanks
> >
> > >
> > > Signed-off-by: Eugenio Pérez <[email protected]>
> > > ---
> > > include/linux/vdpa.h | 4 ++++
> > > 1 file changed, 4 insertions(+)
> > >
> > > diff --git a/include/linux/vdpa.h b/include/linux/vdpa.h
> > > index 7b4a13d3bd91..d282f464d2f1 100644
> > > --- a/include/linux/vdpa.h
> > > +++ b/include/linux/vdpa.h
> > > @@ -218,6 +218,9 @@ struct vdpa_map_file {
> > > * @reset: Reset device
> > > * @vdev: vdpa device
> > > * Returns integer: success (0) or error (< 0)
> > > + * @suspend: Suspend or resume the device (optional)
> > > + * @vdev: vdpa device
> > > + * Returns integer: success (0) or error (< 0)
> > > * @get_config_size: Get the size of the configuration space includes
> > > * fields that are conditional on feature bits.
> > > * @vdev: vdpa device
> > > @@ -319,6 +322,7 @@ struct vdpa_config_ops {
> > > u8 (*get_status)(struct vdpa_device *vdev);
> > > void (*set_status)(struct vdpa_device *vdev, u8 status);
> > > int (*reset)(struct vdpa_device *vdev);
> > > + int (*suspend)(struct vdpa_device *vdev);
> > > size_t (*get_config_size)(struct vdpa_device *vdev);
> > > void (*get_config)(struct vdpa_device *vdev, unsigned int offset,
> > > void *buf, unsigned int len);
> > > --
> > > 2.31.1
> > >
> >
>