Raspberry 4: XEN support

Added the support for DOM0 in raspberry pi4. The feature agl-virt-xen should be enabled to activate this code.

1512 MB of memory is used for DOM0 machine.

There are limitations:
	- brcmfmac module disabled (bluethooth and Wifi) due to the crash
	- total_memory is set to the 3Gb, as it impacts the USB ports on rasbperry pi4 on Linux kernel 4.19

v2 (jsmoeller): make changes in virtualization-layer conditional to raspberrypi4

Bug-AGL: SPEC-3259
Change-Id: I873fbf1f5498e31ae5f468407502f16e1873f7fc
Signed-off-by: Leonid Lazarev <leonid.lazarev@mera.com>
Signed-off-by: Jan-Simon Möller <jsmoeller@linuxfoundation.org>
Reviewed-on: https://gerrit.automotivelinux.org/gerrit/c/AGL/meta-agl/+/24522
Tested-by: Jenkins Job builder account <agl-jobbuilder@automotivelinux.org>
ci-image-build: Jenkins Job builder account <agl-jobbuilder@automotivelinux.org>
ci-image-boot-test: Jenkins Job builder account <agl-jobbuilder@automotivelinux.org>

5 files changed, 132 insertions, 0 deletions

diff --git a/meta-agl-bsp/meta-raspberrypi/recipes-kernel/linux/files/0002-Disable-DMA-in-sdhci-driver.patch b/meta-agl-bsp/meta-raspberrypi/recipes-kernel/linux/files/0002-Disable-DMA-in-sdhci-driver.patch
new file mode 100644
index 000000000..04a8733f2
--- /dev/null
+++ b/meta-agl-bsp/meta-raspberrypi/recipes-kernel/linux/files/0002-Disable-DMA-in-sdhci-driver.patch
@@ -0,0 +1,25 @@
+From 758bc9b917469bc4e527dc3aae821c91cbc3d426 Mon Sep 17 00:00:00 2001
+From: Stewart Hildebrand <stewart.hildebrand@dornerworks.com>
+Date: Thu, 18 Jul 2019 00:01:27 -0400
+Subject: [PATCH 2/4] Disable DMA in sdhci driver
+
+---
+ drivers/mmc/host/sdhci-iproc.c | 2 ++
+ 1 file changed, 2 insertions(+)
+
+diff --git a/drivers/mmc/host/sdhci-iproc.c b/drivers/mmc/host/sdhci-iproc.c
+index 983cddce9..150f7bfc8 100644
+--- a/drivers/mmc/host/sdhci-iproc.c
++++ b/drivers/mmc/host/sdhci-iproc.c
+@@ -252,6 +252,8 @@ static const struct sdhci_iproc_data bcm2835_data = {
+ 
+ static const struct sdhci_pltfm_data sdhci_bcm2838_pltfm_data = {
+ 	.ops = &sdhci_iproc_32only_ops,
++	.quirks = SDHCI_QUIRK_BROKEN_DMA |
++		  SDHCI_QUIRK_BROKEN_ADMA,
+ };
+ 
+ static const struct sdhci_iproc_data bcm2838_data = {
+-- 
+2.17.1
+
diff --git a/meta-agl-bsp/meta-raspberrypi/recipes-kernel/linux/files/0003-Fix-PCIe-in-dom0-for-RPi4.patch b/meta-agl-bsp/meta-raspberrypi/recipes-kernel/linux/files/0003-Fix-PCIe-in-dom0-for-RPi4.patch
new file mode 100644
index 000000000..835f36da3
--- /dev/null
+++ b/meta-agl-bsp/meta-raspberrypi/recipes-kernel/linux/files/0003-Fix-PCIe-in-dom0-for-RPi4.patch
@@ -0,0 +1,31 @@
+From 77765c2a47ce43911b8fe7b09f037c9bc13008ca Mon Sep 17 00:00:00 2001
+From: Jeff Kubascik <jeff.kubascik@dornerworks.com>
+Date: Tue, 30 Jul 2019 08:49:56 -0400
+Subject: [PATCH 3/4] Fix PCIe in dom0 for RPi4
+
+There is an issue where the Broadcom PCIe driver and Xen swiotlb layer
+invoke each other's dma alloc function recursively until the stack blows
+up. The cause appears to be due to arch_setup_dma_ops being called
+more than once for the device, possibly through of_dma_configure, and
+screwing up the dma_ops pointers. This patch adds a check to make sure
+that the xen_dma_ops are applied only once for a device.
+---
+ arch/arm64/mm/dma-mapping.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/arch/arm64/mm/dma-mapping.c b/arch/arm64/mm/dma-mapping.c
+index d3a5bb16f..243a3b9be 100644
+--- a/arch/arm64/mm/dma-mapping.c
++++ b/arch/arm64/mm/dma-mapping.c
+@@ -895,7 +895,7 @@ void arch_setup_dma_ops(struct device *dev, u64 dma_base, u64 size,
+ 	__iommu_setup_dma_ops(dev, dma_base, size, iommu);
+ 
+ #ifdef CONFIG_XEN
+-	if (xen_initial_domain()) {
++	if (!dev->archdata.dev_dma_ops && xen_initial_domain()) {
+ 		dev->archdata.dev_dma_ops = dev->dma_ops;
+ 		dev->dma_ops = xen_dma_ops;
+ 	}
+-- 
+2.17.1
+
diff --git a/meta-agl-bsp/meta-raspberrypi/recipes-kernel/linux/files/xen-be.cfg b/meta-agl-bsp/meta-raspberrypi/recipes-kernel/linux/files/xen-be.cfg
new file mode 100644
index 000000000..36f390187
--- /dev/null
+++ b/meta-agl-bsp/meta-raspberrypi/recipes-kernel/linux/files/xen-be.cfg
@@ -0,0 +1,50 @@
+# global stuff - these enable us to allow some
+# of the not so generic stuff below for xen
+CONFIG_PARAVIRT=y
+CONFIG_NET=y
+CONFIG_NET_CORE=y
+CONFIG_NETDEVICES=y
+CONFIG_BLOCK=y
+CONFIG_WATCHDOG=y
+CONFIG_TARGET_CORE=y
+CONFIG_SCSI=y
+CONFIG_FB=y
+CONFIG_INPUT_MISC=y
+CONFIG_MEMORY_HOTPLUG=y
+CONFIG_TTY=y
+# Technically not required but otherwise produces
+# pretty useless systems starting from allnoconfig
+# You want TCP/IP and ELF binaries right?
+CONFIG_INET=y
+CONFIG_BINFMT_ELF=y
+# generic config
+CONFIG_XEN=y
+CONFIG_XEN_DOM0=y
+# backend drivers
+CONFIG_XEN_BACKEND=y
+CONFIG_XEN_BLKDEV_BACKEND=m
+CONFIG_XEN_NETDEV_BACKEND=m
+CONFIG_HVC_XEN=y
+CONFIG_XEN_WDT=m
+CONFIG_XEN_SCSI_BACKEND=m
+# frontend drivers
+CONFIG_XEN_FBDEV_FRONTEND=m
+CONFIG_HVC_XEN_FRONTEND=y
+CONFIG_INPUT_XEN_KBDDEV_FRONTEND=m
+CONFIG_XEN_SCSI_FRONTEND=m
+# others
+CONFIG_XEN_BALLOON=y
+CONFIG_XEN_SCRUB_PAGES=y
+CONFIG_XEN_DEV_EVTCHN=m
+CONFIG_XEN_BLKDEV_FRONTEND=m
+CONFIG_XEN_NETDEV_FRONTEND=m
+CONFIG_XENFS=m
+CONFIG_XEN_COMPAT_XENFS=y
+CONFIG_XEN_SYS_HYPERVISOR=y
+CONFIG_XEN_XENBUS_FRONTEND=y
+CONFIG_XEN_GNTDEV=m
+CONFIG_XEN_GRANT_DEV_ALLOC=m
+CONFIG_SWIOTLB_XEN=y
+CONFIG_XEN_PRIVCMD=m
+CONFIG_DEBUG_INFO=y
+CONFIG_FRAME_POINTER=y
diff --git a/meta-agl-bsp/meta-raspberrypi/recipes-kernel/linux/linux-raspberrypi_%.bbappend b/meta-agl-bsp/meta-raspberrypi/recipes-kernel/linux/linux-raspberrypi_%.bbappend
index ff17b2532..f78e0b5eb 100644
--- a/meta-agl-bsp/meta-raspberrypi/recipes-kernel/linux/linux-raspberrypi_%.bbappend
+++ b/meta-agl-bsp/meta-raspberrypi/recipes-kernel/linux/linux-raspberrypi_%.bbappend
@@ -5,8 +5,18 @@ require recipes-kernel/linux/linux-agl.inc
 SRC_URI_append = "\
     ${@oe.utils.conditional('USE_FAYTECH_MONITOR', '1', 'file://0002-faytech-fix-rpi.patch', '', d)} \
 "
+#take in account that linux under xen should use the hvc0 console
+SERIAL_OPTION = "${@bb.utils.contains('AGL_XEN_WANTED','1','hvc0','115200;ttyS0',d)}"
+SERIAL = "${@oe.utils.conditional("ENABLE_UART", "1", "console=${SERIAL_OPTION}", "", d)}"
 
 CMDLINE_DEBUG = ""
+
+#XEN related option
+CMDLINE_append = ' ${@bb.utils.contains('AGL_XEN_WANTED','1','clk_ignore_unused','',d)}'
+
+#workaround for crash during brcmfmac loading. Disable it at this moment
+CMDLINE_append = ' ${@bb.utils.contains('AGL_XEN_WANTED','1','modprobe.blacklist=brcmfmac','',d)}'
+
 CMDLINE_append = " usbhid.mousepoll=0"
 
 # Add options to allow CMA to operate
diff --git a/meta-agl-bsp/meta-raspberrypi/recipes-kernel/linux/linux-raspberrypi_4.19.bbappend b/meta-agl-bsp/meta-raspberrypi/recipes-kernel/linux/linux-raspberrypi_4.19.bbappend
index 782d61597..7f17f0c3f 100644
--- a/meta-agl-bsp/meta-raspberrypi/recipes-kernel/linux/linux-raspberrypi_4.19.bbappend
+++ b/meta-agl-bsp/meta-raspberrypi/recipes-kernel/linux/linux-raspberrypi_4.19.bbappend
@@ -2,3 +2,19 @@ require recipes-kernel/linux/linux-agl-4.19.inc
 
 ENABLE_UART_raspberrypi4 = "1"
 
+FILESEXTRAPATHS_prepend := "${THISDIR}/files:"
+
+
+# For Xen
+
+SRC_URI_append =" \
+    ${@bb.utils.contains('AGL_XEN_WANTED','1','file://0002-Disable-DMA-in-sdhci-driver.patch','',d)} \
+"
+
+SRC_URI_append =" \
+    ${@bb.utils.contains('AGL_XEN_WANTED','1','file://0003-Fix-PCIe-in-dom0-for-RPi4.patch','',d)} \
+"
+
+SRC_URI_append = " \
+    ${@bb.utils.contains('AGL_XEN_WANTED','1','file://xen-be.cfg','',d)} \
+"