[PATCH] firmware: arm_ffa: Allow the FF-A drivers to use 32bit mode of messaging

[PATCH] firmware: arm_ffa: Allow the FF-A drivers to use 32bit mode of messaging

[Sudeep Holla]

An FF-A ABI could support both the SMC32 and SMC64 conventions.
A callee that runs in the AArch64 execution state and implements such
an ABI must implement both SMC32 and SMC64 conventions of the ABI.

So the FF-A drivers will need the option to choose the mode irrespective
of FF-A version and the partition execution mode flag in the partition
information.

Let us remove the check on the FF-A version for allowing the selection
of 32bit mode of messaging. The driver will continue to set the 32-bit
mode if the partition execution mode flag specified that the partition
supports only 32-bit execution.

Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
---
 drivers/firmware/arm_ffa/driver.c | 12 ++----------
 1 file changed, 2 insertions(+), 10 deletions(-)

Hi Jens,

Based on our discussion in private, I am posting this patch. I am not marking
fixes tag as the driver version is not yet bumped in the mainline. But if you
think it is better to add, I can update when pulling in the change. Let me
know.

Regards,
Sudeep

diff --git a/drivers/firmware/arm_ffa/driver.c b/drivers/firmware/arm_ffa/driver.c
index 121f4fc903cd..7cd6b1564e80 100644
--- a/drivers/firmware/arm_ffa/driver.c
+++ b/drivers/firmware/arm_ffa/driver.c
@@ -587,17 +587,9 @@ static int ffa_partition_info_get(const char *uuid_str,
 	return 0;
 }
 
-static void _ffa_mode_32bit_set(struct ffa_device *dev)
-{
-	dev->mode_32bit = true;
-}
-
 static void ffa_mode_32bit_set(struct ffa_device *dev)
 {
-	if (drv_info->version > FFA_VERSION_1_0)
-		return;
-
-	_ffa_mode_32bit_set(dev);
+	dev->mode_32bit = true;
 }
 
 static int ffa_sync_send_receive(struct ffa_device *dev,
@@ -706,7 +698,7 @@ static void ffa_setup_partitions(void)
 
 		if (drv_info->version > FFA_VERSION_1_0 &&
 		    !(tpbuf->properties & FFA_PARTITION_AARCH64_EXEC))
-			_ffa_mode_32bit_set(ffa_dev);
+			ffa_mode_32bit_set(ffa_dev);
 	}
 	kfree(pbuf);
 }
-- 
2.42.0


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Re: [PATCH] firmware: arm_ffa: Allow the FF-A drivers to use 32bit mode of messaging

[Jens Wiklander]

Hi Sudeep,

On Thu, Oct 5, 2023 at 4:28 PM Sudeep Holla <sudeep.holla@arm.com> wrote:
>
> An FF-A ABI could support both the SMC32 and SMC64 conventions.
> A callee that runs in the AArch64 execution state and implements such
> an ABI must implement both SMC32 and SMC64 conventions of the ABI.
>
> So the FF-A drivers will need the option to choose the mode irrespective
> of FF-A version and the partition execution mode flag in the partition
> information.
>
> Let us remove the check on the FF-A version for allowing the selection
> of 32bit mode of messaging. The driver will continue to set the 32-bit
> mode if the partition execution mode flag specified that the partition
> supports only 32-bit execution.
>
> Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
> ---
>  drivers/firmware/arm_ffa/driver.c | 12 ++----------
>  1 file changed, 2 insertions(+), 10 deletions(-)
>
> Hi Jens,
>
> Based on our discussion in private, I am posting this patch. I am not marking
> fixes tag as the driver version is not yet bumped in the mainline. But if you
> think it is better to add, I can update when pulling in the change. Let me
> know.

A fixes tag would be nice, to make sure that this patch isn't missed.

Thanks,
Jens

>
> Regards,
> Sudeep
>
> diff --git a/drivers/firmware/arm_ffa/driver.c b/drivers/firmware/arm_ffa/driver.c
> index 121f4fc903cd..7cd6b1564e80 100644
> --- a/drivers/firmware/arm_ffa/driver.c
> +++ b/drivers/firmware/arm_ffa/driver.c
> @@ -587,17 +587,9 @@ static int ffa_partition_info_get(const char *uuid_str,
>         return 0;
>  }
>
> -static void _ffa_mode_32bit_set(struct ffa_device *dev)
> -{
> -       dev->mode_32bit = true;
> -}
> -
>  static void ffa_mode_32bit_set(struct ffa_device *dev)
>  {
> -       if (drv_info->version > FFA_VERSION_1_0)
> -               return;
> -
> -       _ffa_mode_32bit_set(dev);
> +       dev->mode_32bit = true;
>  }
>
>  static int ffa_sync_send_receive(struct ffa_device *dev,
> @@ -706,7 +698,7 @@ static void ffa_setup_partitions(void)
>
>                 if (drv_info->version > FFA_VERSION_1_0 &&
>                     !(tpbuf->properties & FFA_PARTITION_AARCH64_EXEC))
> -                       _ffa_mode_32bit_set(ffa_dev);
> +                       ffa_mode_32bit_set(ffa_dev);
>         }
>         kfree(pbuf);
>  }
> --
> 2.42.0
>

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Re: [PATCH] firmware: arm_ffa: Allow the FF-A drivers to use 32bit mode of messaging

[Sudeep Holla]

On Fri, Oct 06, 2023 at 01:14:33PM +0200, Jens Wiklander wrote:
> Hi Sudeep,
> 
> On Thu, Oct 5, 2023 at 4:28 PM Sudeep Holla <sudeep.holla@arm.com> wrote:
> >
> > An FF-A ABI could support both the SMC32 and SMC64 conventions.
> > A callee that runs in the AArch64 execution state and implements such
> > an ABI must implement both SMC32 and SMC64 conventions of the ABI.
> >
> > So the FF-A drivers will need the option to choose the mode irrespective
> > of FF-A version and the partition execution mode flag in the partition
> > information.
> >
> > Let us remove the check on the FF-A version for allowing the selection
> > of 32bit mode of messaging. The driver will continue to set the 32-bit
> > mode if the partition execution mode flag specified that the partition
> > supports only 32-bit execution.
> >
> > Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
> > ---
> >  drivers/firmware/arm_ffa/driver.c | 12 ++----------
> >  1 file changed, 2 insertions(+), 10 deletions(-)
> >
> > Hi Jens,
> >
> > Based on our discussion in private, I am posting this patch. I am not marking
> > fixes tag as the driver version is not yet bumped in the mainline. But if you
> > think it is better to add, I can update when pulling in the change. Let me
> > know.
> 
> A fixes tag would be nice, to make sure that this patch isn't missed.
> 

Thanks I will add.

-- 
Regards,
Sudeep

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Re: [PATCH] firmware: arm_ffa: Allow the FF-A drivers to use 32bit mode of messaging

[Sudeep Holla]

On Thu, 05 Oct 2023 15:28:23 +0100, Sudeep Holla wrote:
> An FF-A ABI could support both the SMC32 and SMC64 conventions.
> A callee that runs in the AArch64 execution state and implements such
> an ABI must implement both SMC32 and SMC64 conventions of the ABI.
>
> So the FF-A drivers will need the option to choose the mode irrespective
> of FF-A version and the partition execution mode flag in the partition
> information.
>
> [...]

Applied to sudeep.holla/linux (for-next/ffa/updates), thanks!

[1/1] firmware: arm_ffa: Allow the FF-A drivers to use 32bit mode of messaging
      https://git.kernel.org/sudeep.holla/c/2d698e8b4fd2
--
Regards,
Sudeep


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