[Pkg-xen-devel] [PATCH 11/12] xen/arm: plat: Allocate as much as possible memory below 1GB for dom0 for RPI

[Julien Grall]

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 at amazon.com>
Reported-by: Corey Minyard <minyard at acm.org>
Tested-by: Corey Minyard <cminyard at mvista.com>

---
    Changes in v2:
        - 1G is 30 bits not 10!
        - Add Corey's tested-by
---
 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 b697fa2c6c..f5ae58a7d5 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    = 30,
 PLATFORM_END
 
 /*
-- 
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