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hw/riscv: virt: Add optional ACLINT support to virt machine 

We extend virt machine to emulate ACLINT devices only when "aclint=on"
parameter is passed along with machine name in QEMU command-line.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Message-id: 20210831110603.338681-5-anup.patel@wdc.com
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
This commit is contained in:
Anup Patel 2021-08-31 16:36:03 +05:30 committed by Alistair Francis
parent 0ffc1a9522
commit 954886ea6d
3 changed files with 124 additions and 1 deletions
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10
docs/system/riscv/virt.rst
View File

@ -53,6 +53,16 @@ with the default OpenSBI firmware image as the -bios. It also supports
the recommended RISC-V bootflow: U-Boot SPL (M-mode) loads OpenSBI fw_dynamic
firmware and U-Boot proper (S-mode), using the standard -bios functionality.
Machine-specific options
------------------------
The following machine-specific options are supported:
- aclint=[on|off]
When this option is "on", ACLINT devices will be emulated instead of
SiFive CLINT. When not specified, this option is assumed to be "off".
Running Linux kernel
--------------------

113
hw/riscv/virt.c
View File

@ -48,6 +48,7 @@ static const MemMapEntry virt_memmap[] = {
[VIRT_TEST] = { 0x100000, 0x1000 },
[VIRT_RTC] = { 0x101000, 0x1000 },
[VIRT_CLINT] = { 0x2000000, 0x10000 },
[VIRT_ACLINT_SSWI] = { 0x2F00000, 0x4000 },
[VIRT_PCIE_PIO] = { 0x3000000, 0x10000 },
[VIRT_PLIC] = { 0xc000000, VIRT_PLIC_SIZE(VIRT_CPUS_MAX * 2) },
[VIRT_UART0] = { 0x10000000, 0x100 },
@ -281,6 +282,82 @@ static void create_fdt_socket_clint(RISCVVirtState *s,
g_free(clint_cells);
}
static void create_fdt_socket_aclint(RISCVVirtState *s,
const MemMapEntry *memmap, int socket,
uint32_t *intc_phandles)
{
int cpu;
char *name;
unsigned long addr;
uint32_t aclint_cells_size;
uint32_t *aclint_mswi_cells;
uint32_t *aclint_sswi_cells;
uint32_t *aclint_mtimer_cells;
MachineState *mc = MACHINE(s);
aclint_mswi_cells = g_new0(uint32_t, s->soc[socket].num_harts * 2);
aclint_mtimer_cells = g_new0(uint32_t, s->soc[socket].num_harts * 2);
aclint_sswi_cells = g_new0(uint32_t, s->soc[socket].num_harts * 2);
for (cpu = 0; cpu < s->soc[socket].num_harts; cpu++) {
aclint_mswi_cells[cpu * 2 + 0] = cpu_to_be32(intc_phandles[cpu]);
aclint_mswi_cells[cpu * 2 + 1] = cpu_to_be32(IRQ_M_SOFT);
aclint_mtimer_cells[cpu * 2 + 0] = cpu_to_be32(intc_phandles[cpu]);
aclint_mtimer_cells[cpu * 2 + 1] = cpu_to_be32(IRQ_M_TIMER);
aclint_sswi_cells[cpu * 2 + 0] = cpu_to_be32(intc_phandles[cpu]);
aclint_sswi_cells[cpu * 2 + 1] = cpu_to_be32(IRQ_S_SOFT);
}
aclint_cells_size = s->soc[socket].num_harts * sizeof(uint32_t) * 2;
addr = memmap[VIRT_CLINT].base + (memmap[VIRT_CLINT].size * socket);
name = g_strdup_printf("/soc/mswi@%lx", addr);
qemu_fdt_add_subnode(mc->fdt, name);
qemu_fdt_setprop_string(mc->fdt, name, "compatible", "riscv,aclint-mswi");
qemu_fdt_setprop_cells(mc->fdt, name, "reg",
0x0, addr, 0x0, RISCV_ACLINT_SWI_SIZE);
qemu_fdt_setprop(mc->fdt, name, "interrupts-extended",
aclint_mswi_cells, aclint_cells_size);
qemu_fdt_setprop(mc->fdt, name, "interrupt-controller", NULL, 0);
qemu_fdt_setprop_cell(mc->fdt, name, "#interrupt-cells", 0);
riscv_socket_fdt_write_id(mc, mc->fdt, name, socket);
g_free(name);
addr = memmap[VIRT_CLINT].base + RISCV_ACLINT_SWI_SIZE +
(memmap[VIRT_CLINT].size * socket);
name = g_strdup_printf("/soc/mtimer@%lx", addr);
qemu_fdt_add_subnode(mc->fdt, name);
qemu_fdt_setprop_string(mc->fdt, name, "compatible",
"riscv,aclint-mtimer");
qemu_fdt_setprop_cells(mc->fdt, name, "reg",
0x0, addr + RISCV_ACLINT_DEFAULT_MTIME,
0x0, memmap[VIRT_CLINT].size - RISCV_ACLINT_SWI_SIZE -
RISCV_ACLINT_DEFAULT_MTIME,
0x0, addr + RISCV_ACLINT_DEFAULT_MTIMECMP,
0x0, RISCV_ACLINT_DEFAULT_MTIME);
qemu_fdt_setprop(mc->fdt, name, "interrupts-extended",
aclint_mtimer_cells, aclint_cells_size);
riscv_socket_fdt_write_id(mc, mc->fdt, name, socket);
g_free(name);
addr = memmap[VIRT_ACLINT_SSWI].base +
(memmap[VIRT_ACLINT_SSWI].size * socket);
name = g_strdup_printf("/soc/sswi@%lx", addr);
qemu_fdt_add_subnode(mc->fdt, name);
qemu_fdt_setprop_string(mc->fdt, name, "compatible", "riscv,aclint-sswi");
qemu_fdt_setprop_cells(mc->fdt, name, "reg",
0x0, addr, 0x0, memmap[VIRT_ACLINT_SSWI].size);
qemu_fdt_setprop(mc->fdt, name, "interrupts-extended",
aclint_sswi_cells, aclint_cells_size);
qemu_fdt_setprop(mc->fdt, name, "interrupt-controller", NULL, 0);
qemu_fdt_setprop_cell(mc->fdt, name, "#interrupt-cells", 0);
riscv_socket_fdt_write_id(mc, mc->fdt, name, socket);
g_free(name);
g_free(aclint_mswi_cells);
g_free(aclint_mtimer_cells);
g_free(aclint_sswi_cells);
}
static void create_fdt_socket_plic(RISCVVirtState *s,
const MemMapEntry *memmap, int socket,
uint32_t *phandle, uint32_t *intc_phandles,
@ -359,7 +436,11 @@ static void create_fdt_sockets(RISCVVirtState *s, const MemMapEntry *memmap,
create_fdt_socket_memory(s, memmap, socket);
create_fdt_socket_clint(s, memmap, socket, intc_phandles);
if (s->have_aclint) {
create_fdt_socket_aclint(s, memmap, socket, intc_phandles);
} else {
create_fdt_socket_clint(s, memmap, socket, intc_phandles);
}
create_fdt_socket_plic(s, memmap, socket, phandle,
intc_phandles, xplic_phandles);
@ -750,6 +831,14 @@ static void virt_machine_init(MachineState *machine)
RISCV_ACLINT_DEFAULT_MTIMECMP, RISCV_ACLINT_DEFAULT_MTIME,
RISCV_ACLINT_DEFAULT_TIMEBASE_FREQ, true);
/* Per-socket ACLINT SSWI */
if (s->have_aclint) {
riscv_aclint_swi_create(
memmap[VIRT_ACLINT_SSWI].base +
i * memmap[VIRT_ACLINT_SSWI].size,
base_hartid, hart_count, true);
}
/* Per-socket PLIC hart topology configuration string */
plic_hart_config = plic_hart_config_string(hart_count);
@ -914,6 +1003,22 @@ static void virt_machine_instance_init(Object *obj)
{
}
static bool virt_get_aclint(Object *obj, Error **errp)
{
MachineState *ms = MACHINE(obj);
RISCVVirtState *s = RISCV_VIRT_MACHINE(ms);
return s->have_aclint;
}
static void virt_set_aclint(Object *obj, bool value, Error **errp)
{
MachineState *ms = MACHINE(obj);
RISCVVirtState *s = RISCV_VIRT_MACHINE(ms);
s->have_aclint = value;
}
static void virt_machine_class_init(ObjectClass *oc, void *data)
{
MachineClass *mc = MACHINE_CLASS(oc);
@ -929,6 +1034,12 @@ static void virt_machine_class_init(ObjectClass *oc, void *data)
mc->numa_mem_supported = true;
machine_class_allow_dynamic_sysbus_dev(mc, TYPE_RAMFB_DEVICE);
object_class_property_add_bool(oc, "aclint", virt_get_aclint,
virt_set_aclint);
object_class_property_set_description(oc, "aclint",
"Set on/off to enable/disable "
"emulating ACLINT devices");
}
static const TypeInfo virt_machine_typeinfo = {

2
include/hw/riscv/virt.h
View File

@ -43,6 +43,7 @@ struct RISCVVirtState {
FWCfgState *fw_cfg;
int fdt_size;
bool have_aclint;
};
enum {
@ -51,6 +52,7 @@ enum {
VIRT_TEST,
VIRT_RTC,
VIRT_CLINT,
VIRT_ACLINT_SSWI,
VIRT_PLIC,
VIRT_UART0,
VIRT_VIRTIO,