[Qemu-devel] [PULL 28/32] riscv: sifive_u: Do not create hard-coded phandles in DT

[Palmer Dabbelt <palmer@sifive.com>]

From: Bin Meng <bmeng.cn@gmail.com>

At present the cpu, plic and ethclk nodes' phandles are hard-coded
to 1/2/3 in DT. If we configure more than 1 cpu for the machine,
all cpu nodes' phandles conflict with each other as they are all 1.
Fix it by removing the hardcode.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Signed-off-by: Palmer Dabbelt <palmer@sifive.com>
---
 hw/riscv/sifive_u.c | 17 ++++++++++-------
 1 file changed, 10 insertions(+), 7 deletions(-)

diff --git a/hw/riscv/sifive_u.c b/hw/riscv/sifive_u.c
index 5ecc47cea35d..e2120ac7a5d3 100644
--- a/hw/riscv/sifive_u.c
+++ b/hw/riscv/sifive_u.c
@@ -86,7 +86,7 @@ static void create_fdt(SiFiveUState *s, const struct MemmapEntry *memmap,
     uint32_t *cells;
     char *nodename;
     char ethclk_names[] = "pclk\0hclk\0tx_clk";
-    uint32_t plic_phandle, ethclk_phandle;
+    uint32_t plic_phandle, ethclk_phandle, phandle = 1;
 
     fdt = s->fdt = create_device_tree(&s->fdt_size);
     if (!fdt) {
@@ -121,6 +121,7 @@ static void create_fdt(SiFiveUState *s, const struct MemmapEntry *memmap,
     qemu_fdt_setprop_cell(fdt, "/cpus", "#address-cells", 0x1);
 
     for (cpu = s->soc.cpus.num_harts - 1; cpu >= 0; cpu--) {
+        int cpu_phandle = phandle++;
         nodename = g_strdup_printf("/cpus/cpu@%d", cpu);
         char *intc = g_strdup_printf("/cpus/cpu@%d/interrupt-controller", cpu);
         char *isa = riscv_isa_string(&s->soc.cpus.harts[cpu]);
@@ -134,8 +135,8 @@ static void create_fdt(SiFiveUState *s, const struct MemmapEntry *memmap,
         qemu_fdt_setprop_cell(fdt, nodename, "reg", cpu);
         qemu_fdt_setprop_string(fdt, nodename, "device_type", "cpu");
         qemu_fdt_add_subnode(fdt, intc);
-        qemu_fdt_setprop_cell(fdt, intc, "phandle", 1);
-        qemu_fdt_setprop_cell(fdt, intc, "linux,phandle", 1);
+        qemu_fdt_setprop_cell(fdt, intc, "phandle", cpu_phandle);
+        qemu_fdt_setprop_cell(fdt, intc, "linux,phandle", cpu_phandle);
         qemu_fdt_setprop_string(fdt, intc, "compatible", "riscv,cpu-intc");
         qemu_fdt_setprop(fdt, intc, "interrupt-controller", NULL, 0);
         qemu_fdt_setprop_cell(fdt, intc, "#interrupt-cells", 1);
@@ -167,6 +168,7 @@ static void create_fdt(SiFiveUState *s, const struct MemmapEntry *memmap,
     g_free(cells);
     g_free(nodename);
 
+    plic_phandle = phandle++;
     cells =  g_new0(uint32_t, s->soc.cpus.num_harts * 4);
     for (cpu = 0; cpu < s->soc.cpus.num_harts; cpu++) {
         nodename =
@@ -192,20 +194,21 @@ static void create_fdt(SiFiveUState *s, const struct MemmapEntry *memmap,
     qemu_fdt_setprop_string(fdt, nodename, "reg-names", "control");
     qemu_fdt_setprop_cell(fdt, nodename, "riscv,max-priority", 7);
     qemu_fdt_setprop_cell(fdt, nodename, "riscv,ndev", 0x35);
-    qemu_fdt_setprop_cells(fdt, nodename, "phandle", 2);
-    qemu_fdt_setprop_cells(fdt, nodename, "linux,phandle", 2);
+    qemu_fdt_setprop_cells(fdt, nodename, "phandle", plic_phandle);
+    qemu_fdt_setprop_cells(fdt, nodename, "linux,phandle", plic_phandle);
     plic_phandle = qemu_fdt_get_phandle(fdt, nodename);
     g_free(cells);
     g_free(nodename);
 
+    ethclk_phandle = phandle++;
     nodename = g_strdup_printf("/soc/ethclk");
     qemu_fdt_add_subnode(fdt, nodename);
     qemu_fdt_setprop_string(fdt, nodename, "compatible", "fixed-clock");
     qemu_fdt_setprop_cell(fdt, nodename, "#clock-cells", 0x0);
     qemu_fdt_setprop_cell(fdt, nodename, "clock-frequency",
         SIFIVE_U_GEM_CLOCK_FREQ);
-    qemu_fdt_setprop_cell(fdt, nodename, "phandle", 3);
-    qemu_fdt_setprop_cell(fdt, nodename, "linux,phandle", 3);
+    qemu_fdt_setprop_cell(fdt, nodename, "phandle", ethclk_phandle);
+    qemu_fdt_setprop_cell(fdt, nodename, "linux,phandle", ethclk_phandle);
     ethclk_phandle = qemu_fdt_get_phandle(fdt, nodename);
     g_free(nodename);
 
-- 
2.21.0