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Re: [PATCH for-4.14 3/3] xen/arm: plat: Allocate as much as possible memory below 1GB for dom0 for RPI
- To: "julien@xxxxxxx" <julien@xxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>
- Date: Mon, 18 May 2020 20:36:08 +0000
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- Cc: "jeff.kubascik@xxxxxxxxxxxxxxx" <jeff.kubascik@xxxxxxxxxxxxxxx>, "jgrall@xxxxxxxxxx" <jgrall@xxxxxxxxxx>, "sstabellini@xxxxxxxxxx" <sstabellini@xxxxxxxxxx>, "roman@xxxxxxxxxx" <roman@xxxxxxxxxx>, "minyard@xxxxxxx" <minyard@xxxxxxx>
- Delivery-date: Mon, 18 May 2020 20:36:23 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
- Thread-index: AQHWLQfDNIfgFSjSGUyub+p/1yhn8KiuTdqA
- Thread-topic: [PATCH for-4.14 3/3] xen/arm: plat: Allocate as much as possible memory below 1GB for dom0 for RPI
Hi Julien,
On Mon, 2020-05-18 at 12:30 +0100, Julien Grall wrote:
> From: Julien Grall <jgrall@xxxxxxxxxx>
>
> The raspberry PI 4 has devices that can only DMA into the first GB of
> the RAM. Therefore we want allocate as much as possible memory below 1GB
> for dom0.
>
> Use the recently introduced dma_bitsize field to specify the DMA width
> supported.
>
> Signed-off-by: Julien Grall <jgrall@xxxxxxxxxx>
> Reported-by: Corey Minyard <minyard@xxxxxxx>
> ---
> xen/arch/arm/platforms/brcm-raspberry-pi.c | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/xen/arch/arm/platforms/brcm-raspberry-pi.c
> b/xen/arch/arm/platforms/brcm-raspberry-pi.c
> index b697fa2c6c0e..ad5483437b31 100644
> --- a/xen/arch/arm/platforms/brcm-raspberry-pi.c
> +++ b/xen/arch/arm/platforms/brcm-raspberry-pi.c
> @@ -43,6 +43,7 @@ static const struct dt_device_match rpi4_blacklist_dev[]
> __initconst =
> PLATFORM_START(rpi4, "Raspberry Pi 4")
> .compatible = rpi4_dt_compat,
> .blacklist_dev = rpi4_blacklist_dev,
> + .dma_bitsize = 10,
I'm confused. Should it be 30?
> PLATFORM_END
>
> /*
|
