hw/riscv/virt.c | 10 ++++++++++ 1 file changed, 10 insertions(+)
commit 6df664f87c73 ("Revert "hw/riscv/virt.c: imsics DT: add
'#msi-cells'"") removed #msi-cells. Now that we have a Linux
commit to reference add a comment explaining why it was removed
to avoid it getting added back due to DT validation failures.
Signed-off-by: Andrew Jones <ajones@ventanamicro.com>
---
hw/riscv/virt.c | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/hw/riscv/virt.c b/hw/riscv/virt.c
index cef41c150aaf..4fd9c0edf038 100644
--- a/hw/riscv/virt.c
+++ b/hw/riscv/virt.c
@@ -552,6 +552,16 @@ static void create_fdt_one_imsic(RISCVVirtState *s, hwaddr base_addr,
FDT_IMSIC_INT_CELLS);
qemu_fdt_setprop(ms->fdt, imsic_name, "interrupt-controller", NULL, 0);
qemu_fdt_setprop(ms->fdt, imsic_name, "msi-controller", NULL, 0);
+ /*
+ * Per the DT binding, we should also add #msi-cells with a value of zero.
+ * But, Linux which does not include commit db8e81132cf0 ("of/irq: Support
+ * #msi-cells=<0> in of_msi_get_domain") does not properly handle #msi-cells
+ * with a value of zero. For this reason, the property has intentionally
+ * been left out. It's harmless to not add it since the absence of the
+ * property and a value of zero for the property mean the same thing.
+ * However, since the DT binding requires the property, DT validation may
+ * fail.
+ */
qemu_fdt_setprop(ms->fdt, imsic_name, "interrupts-extended",
imsic_cells, ms->smp.cpus * sizeof(uint32_t) * 2);
qemu_fdt_setprop(ms->fdt, imsic_name, "reg", imsic_regs,
--
2.46.0
On 9/25/24 1:39 PM, Andrew Jones wrote: > commit 6df664f87c73 ("Revert "hw/riscv/virt.c: imsics DT: add > '#msi-cells'"") removed #msi-cells. Now that we have a Linux > commit to reference add a comment explaining why it was removed > to avoid it getting added back due to DT validation failures. > > Signed-off-by: Andrew Jones <ajones@ventanamicro.com> > --- Reviewed-by: Daniel Henrique Barboza <dbarboza@ventanamicro.com> > hw/riscv/virt.c | 10 ++++++++++ > 1 file changed, 10 insertions(+) > > diff --git a/hw/riscv/virt.c b/hw/riscv/virt.c > index cef41c150aaf..4fd9c0edf038 100644 > --- a/hw/riscv/virt.c > +++ b/hw/riscv/virt.c > @@ -552,6 +552,16 @@ static void create_fdt_one_imsic(RISCVVirtState *s, hwaddr base_addr, > FDT_IMSIC_INT_CELLS); > qemu_fdt_setprop(ms->fdt, imsic_name, "interrupt-controller", NULL, 0); > qemu_fdt_setprop(ms->fdt, imsic_name, "msi-controller", NULL, 0); > + /* > + * Per the DT binding, we should also add #msi-cells with a value of zero. > + * But, Linux which does not include commit db8e81132cf0 ("of/irq: Support > + * #msi-cells=<0> in of_msi_get_domain") does not properly handle #msi-cells > + * with a value of zero. For this reason, the property has intentionally > + * been left out. It's harmless to not add it since the absence of the > + * property and a value of zero for the property mean the same thing. > + * However, since the DT binding requires the property, DT validation may > + * fail. > + */ > qemu_fdt_setprop(ms->fdt, imsic_name, "interrupts-extended", > imsic_cells, ms->smp.cpus * sizeof(uint32_t) * 2); > qemu_fdt_setprop(ms->fdt, imsic_name, "reg", imsic_regs,
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