hw/riscv/virt: Add IOMMU as platform device if the option is set

Add a new machine option called 'iommu-sys' that enables a
riscv-iommu-sys platform device for the 'virt' machine. The option is
default 'off'.

The device will use IRQs 36 to 39.

We will not support both riscv-iommu-sys and riscv-iommu-pci devices in
the same board in this first implementation. If a riscv-iommu-pci device
is added in the command line we will disable the riscv-iommu-sys device.

Signed-off-by: Sunil V L <sunilvl@ventanamicro.com>
Signed-off-by: Daniel Henrique Barboza <dbarboza@ventanamicro.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Message-ID: <20241106133407.604587-5-dbarboza@ventanamicro.com>
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>

1 files changed, 5 insertions, 1 deletions

diff --git a/include/hw/riscv/virt.h b/include/hw/riscv/virt.h
index c0dc41ff9a..48a14bea2e 100644
--- a/include/hw/riscv/virt.h
+++ b/include/hw/riscv/virt.h
@@ -62,6 +62,7 @@ struct RISCVVirtState {
     OnOffAuto acpi;
     const MemMapEntry *memmap;
     struct GPEXHost *gpex_host;
+    OnOffAuto iommu_sys;
 };
 
 enum {
@@ -84,7 +85,8 @@ enum {
     VIRT_PCIE_MMIO,
     VIRT_PCIE_PIO,
     VIRT_PLATFORM_BUS,
-    VIRT_PCIE_ECAM
+    VIRT_PCIE_ECAM,
+    VIRT_IOMMU_SYS,
 };
 
 enum {
@@ -93,6 +95,7 @@ enum {
     VIRTIO_IRQ = 1, /* 1 to 8 */
     VIRTIO_COUNT = 8,
     PCIE_IRQ = 0x20, /* 32 to 35 */
+    IOMMU_SYS_IRQ = 0x24, /* 36-39 */
     VIRT_PLATFORM_BUS_IRQ = 64, /* 64 to 95 */
 };
 
@@ -129,6 +132,7 @@ enum {
                                  1 + FDT_APLIC_INT_CELLS)
 
 bool virt_is_acpi_enabled(RISCVVirtState *s);
+bool virt_is_iommu_sys_enabled(RISCVVirtState *s);
 void virt_acpi_setup(RISCVVirtState *vms);
 uint32_t imsic_num_bits(uint32_t count);