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Michael S. Tsirkin

2018-Apr-19 17:35 UTC

[PATCH] virtio_ring: switch to dma_XX barriers for rpmsg

virtio is using barriers to order memory accesses, thus
dma_wmb/rmb is a good match.

Build-tested on x86: Before

[mst at tuck linux]$ size drivers/virtio/virtio_ring.o
   text    data     bss     dec     hex filename
  11392     820       0   12212    2fb4 drivers/virtio/virtio_ring.o

After
mst at tuck linux]$ size drivers/virtio/virtio_ring.o
   text    data     bss     dec     hex filename
  11284     820       0   12104    2f48 drivers/virtio/virtio_ring.o

Cc: Ohad Ben-Cohen <ohad at wizery.com>
Cc: Bjorn Andersson <bjorn.andersson at linaro.org>
Cc: linux-remoteproc at vger.kernel.org
Signed-off-by: Michael S. Tsirkin <mst at redhat.com>
---

It's good in theory, but could one of RPMSG maintainers please review
and ack this patch? Or even better test it?

All these barriers are useless on Intel anyway ...

 include/linux/virtio_ring.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/include/linux/virtio_ring.h b/include/linux/virtio_ring.h
index bbf3252..fab0213 100644
--- a/include/linux/virtio_ring.h
+++ b/include/linux/virtio_ring.h
@@ -35,7 +35,7 @@ static inline void virtio_rmb(bool weak_barriers)
 	if (weak_barriers)
 		virt_rmb();
 	else
-		rmb();
+		dma_rmb();
 }
 
 static inline void virtio_wmb(bool weak_barriers)
@@ -43,7 +43,7 @@ static inline void virtio_wmb(bool weak_barriers)
 	if (weak_barriers)
 		virt_wmb();
 	else
-		wmb();
+		dma_wmb();
 }
 
 static inline void virtio_store_mb(bool weak_barriers,
-- 
MST

Paolo Bonzini

2018-Apr-19 17:39 UTC

head link

[PATCH] virtio_ring: switch to dma_XX barriers for rpmsg

On 19/04/2018 19:35, Michael S. Tsirkin wrote:> virtio is using barriers to order memory accesses, thus
> dma_wmb/rmb is a good match.
> 
> Build-tested on x86: Before
> 
> [mst at tuck linux]$ size drivers/virtio/virtio_ring.o
>    text    data     bss     dec     hex filename
>   11392     820       0   12212    2fb4 drivers/virtio/virtio_ring.o
> 
> After
> mst at tuck linux]$ size drivers/virtio/virtio_ring.o
>    text    data     bss     dec     hex filename
>   11284     820       0   12104    2f48 drivers/virtio/virtio_ring.o
> 
> Cc: Ohad Ben-Cohen <ohad at wizery.com>
> Cc: Bjorn Andersson <bjorn.andersson at linaro.org>
> Cc: linux-remoteproc at vger.kernel.org
> Signed-off-by: Michael S. Tsirkin <mst at redhat.com>
> ---
> 
> It's good in theory, but could one of RPMSG maintainers please review
> and ack this patch? Or even better test it?
> 
> All these barriers are useless on Intel anyway ...
This should be okay, but I wonder if there should be a virtio_wmb(...)
or an "if (weak_barriers) wmb()" before the "writel" in
vm_notify
(drivers/virtio/virtio_mmio.c).

Thanks,

Paolo
> 
>  include/linux/virtio_ring.h | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/include/linux/virtio_ring.h b/include/linux/virtio_ring.h
> index bbf3252..fab0213 100644
> --- a/include/linux/virtio_ring.h
> +++ b/include/linux/virtio_ring.h
> @@ -35,7 +35,7 @@ static inline void virtio_rmb(bool weak_barriers)
>  	if (weak_barriers)
>  		virt_rmb();
>  	else
> -		rmb();
> +		dma_rmb();
>  }
>  
>  static inline void virtio_wmb(bool weak_barriers)
> @@ -43,7 +43,7 @@ static inline void virtio_wmb(bool weak_barriers)
>  	if (weak_barriers)
>  		virt_wmb();
>  	else
> -		wmb();
> +		dma_wmb();
>  }
>  
>  static inline void virtio_store_mb(bool weak_barriers,
>

Michael S. Tsirkin

2018-Apr-19 17:46 UTC

head link

[PATCH] virtio_ring: switch to dma_XX barriers for rpmsg

On Thu, Apr 19, 2018 at 07:39:21PM +0200, Paolo Bonzini
wrote:> On 19/04/2018 19:35, Michael S. Tsirkin wrote:
> > virtio is using barriers to order memory accesses, thus
> > dma_wmb/rmb is a good match.
> > 
> > Build-tested on x86: Before
> > 
> > [mst at tuck linux]$ size drivers/virtio/virtio_ring.o
> >    text    data     bss     dec     hex filename
> >   11392     820       0   12212    2fb4 drivers/virtio/virtio_ring.o
> > 
> > After
> > mst at tuck linux]$ size drivers/virtio/virtio_ring.o
> >    text    data     bss     dec     hex filename
> >   11284     820       0   12104    2f48 drivers/virtio/virtio_ring.o
> > 
> > Cc: Ohad Ben-Cohen <ohad at wizery.com>
> > Cc: Bjorn Andersson <bjorn.andersson at linaro.org>
> > Cc: linux-remoteproc at vger.kernel.org
> > Signed-off-by: Michael S. Tsirkin <mst at redhat.com>
> > ---
> > 
> > It's good in theory, but could one of RPMSG maintainers please
review
> > and ack this patch? Or even better test it?
> > 
> > All these barriers are useless on Intel anyway ...
> 
> This should be okay, but I wonder if there should be a virtio_wmb(...)
> or an "if (weak_barriers) wmb()" before the "writel" in
vm_notify
> (drivers/virtio/virtio_mmio.c).
> 
> Thanks,
> 
> Paolo
That one uses weak barriers AFAIK.

IIUC you mean rproc_virtio_notify.

I suspect it works because specific kick callbacks have a barrier internally.

> > 
> >  include/linux/virtio_ring.h | 4 ++--
> >  1 file changed, 2 insertions(+), 2 deletions(-)
> > 
> > diff --git a/include/linux/virtio_ring.h b/include/linux/virtio_ring.h
> > index bbf3252..fab0213 100644
> > --- a/include/linux/virtio_ring.h
> > +++ b/include/linux/virtio_ring.h
> > @@ -35,7 +35,7 @@ static inline void virtio_rmb(bool weak_barriers)
> >  	if (weak_barriers)
> >  		virt_rmb();
> >  	else
> > -		rmb();
> > +		dma_rmb();
> >  }
> >  
> >  static inline void virtio_wmb(bool weak_barriers)
> > @@ -43,7 +43,7 @@ static inline void virtio_wmb(bool weak_barriers)
> >  	if (weak_barriers)
> >  		virt_wmb();
> >  	else
> > -		wmb();
> > +		dma_wmb();
> >  }
> >  
> >  static inline void virtio_store_mb(bool weak_barriers,
> >

Jason Wang

2018-Apr-20 03:04 UTC

head link

[PATCH] virtio_ring: switch to dma_XX barriers for rpmsg

On 2018?04?20? 01:35, Michael S. Tsirkin wrote:> virtio is using barriers to order memory accesses, thus
> dma_wmb/rmb is a good match.
>
> Build-tested on x86: Before
>
> [mst at tuck linux]$ size drivers/virtio/virtio_ring.o
>     text    data     bss     dec     hex filename
>    11392     820       0   12212    2fb4 drivers/virtio/virtio_ring.o
>
> After
> mst at tuck linux]$ size drivers/virtio/virtio_ring.o
>     text    data     bss     dec     hex filename
>    11284     820       0   12104    2f48 drivers/virtio/virtio_ring.o
>
> Cc: Ohad Ben-Cohen <ohad at wizery.com>
> Cc: Bjorn Andersson <bjorn.andersson at linaro.org>
> Cc: linux-remoteproc at vger.kernel.org
> Signed-off-by: Michael S. Tsirkin <mst at redhat.com>
> ---
>
> It's good in theory, but could one of RPMSG maintainers please review
> and ack this patch? Or even better test it?
>
> All these barriers are useless on Intel anyway ...
>
>   include/linux/virtio_ring.h | 4 ++--
>   1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/include/linux/virtio_ring.h b/include/linux/virtio_ring.h
> index bbf3252..fab0213 100644
> --- a/include/linux/virtio_ring.h
> +++ b/include/linux/virtio_ring.h
> @@ -35,7 +35,7 @@ static inline void virtio_rmb(bool weak_barriers)
>   	if (weak_barriers)
>   		virt_rmb();
>   	else
> -		rmb();
> +		dma_rmb();
>   }
>   
>   static inline void virtio_wmb(bool weak_barriers)
> @@ -43,7 +43,7 @@ static inline void virtio_wmb(bool weak_barriers)
>   	if (weak_barriers)
>   		virt_wmb();
>   	else
> -		wmb();
> +		dma_wmb();
>   }
>   
>   static inline void virtio_store_mb(bool weak_barriers,
Acked-by: Jason Wang <jasowang at redhat.com>

Bjorn Andersson

2018-Jun-04 20:02 UTC

head link

[PATCH] virtio_ring: switch to dma_XX barriers for rpmsg

On Thu 19 Apr 10:35 PDT 2018, Michael S. Tsirkin wrote:
> virtio is using barriers to order memory accesses, thus
> dma_wmb/rmb is a good match.
> 
> Build-tested on x86: Before
> 
> [mst at tuck linux]$ size drivers/virtio/virtio_ring.o
>    text    data     bss     dec     hex filename
>   11392     820       0   12212    2fb4 drivers/virtio/virtio_ring.o
> 
> After
> mst at tuck linux]$ size drivers/virtio/virtio_ring.o
>    text    data     bss     dec     hex filename
>   11284     820       0   12104    2f48 drivers/virtio/virtio_ring.o
> 
> Cc: Ohad Ben-Cohen <ohad at wizery.com>
> Cc: Bjorn Andersson <bjorn.andersson at linaro.org>
> Cc: linux-remoteproc at vger.kernel.org
> Signed-off-by: Michael S. Tsirkin <mst at redhat.com>
Acked-by: Bjorn Andersson <bjorn.andersson at linaro.org>

Regards,
Bjorn
> ---
> 
> It's good in theory, but could one of RPMSG maintainers please review
> and ack this patch? Or even better test it?
> 
> All these barriers are useless on Intel anyway ...
> 
>  include/linux/virtio_ring.h | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/include/linux/virtio_ring.h b/include/linux/virtio_ring.h
> index bbf3252..fab0213 100644
> --- a/include/linux/virtio_ring.h
> +++ b/include/linux/virtio_ring.h
> @@ -35,7 +35,7 @@ static inline void virtio_rmb(bool weak_barriers)
>  	if (weak_barriers)
>  		virt_rmb();
>  	else
> -		rmb();
> +		dma_rmb();
>  }
>  
>  static inline void virtio_wmb(bool weak_barriers)
> @@ -43,7 +43,7 @@ static inline void virtio_wmb(bool weak_barriers)
>  	if (weak_barriers)
>  		virt_wmb();
>  	else
> -		wmb();
> +		dma_wmb();
>  }
>  
>  static inline void virtio_store_mb(bool weak_barriers,
> -- 
> MST

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