| Message ID | 20220927100347.176606-4-jean-philippe@linaro.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | hw/arm/virt: Fix dt-schema warnings | expand |
On Tue, 27 Sept 2022 at 11:12, Jean-Philippe Brucker <jean-philippe@linaro.org> wrote: > > The "msi-parent" property can be used on the PCI node when MSIs do not > contain sideband data (device IDs) [1]. In QEMU, MSI transactions > contain the requester ID, so the PCI node should use the "msi-map" > property instead of "msi-parent". In our case the property describes an > identity map between requester ID and sideband data. > > This fixes a warning when passing the DTB generated by QEMU to dtc, > following a recent change to the GICv3 node: > > Warning (msi_parent_property): /pcie@10000000:msi-parent: property size (4) too small for cell size 1 > > [1] linux/Documentation/devicetree/bindings/pci/pci-msi.txt > > Signed-off-by: Jean-Philippe Brucker <jean-philippe@linaro.org> Reviewed-by: Peter Maydell <peter.maydell@linaro.org> thanks -- PMM
Hi Jean, On 9/27/22 12:03, Jean-Philippe Brucker wrote: > The "msi-parent" property can be used on the PCI node when MSIs do not > contain sideband data (device IDs) [1]. In QEMU, MSI transactions > contain the requester ID, so the PCI node should use the "msi-map" > property instead of "msi-parent". In our case the property describes an > identity map between requester ID and sideband data. > > This fixes a warning when passing the DTB generated by QEMU to dtc, > following a recent change to the GICv3 node: > > Warning (msi_parent_property): /pcie@10000000:msi-parent: property size (4) too small for cell size 1 > > [1] linux/Documentation/devicetree/bindings/pci/pci-msi.txt > > Signed-off-by: Jean-Philippe Brucker <jean-philippe@linaro.org> Effectively matches example 1 in [1] Reviewed-by: Eric Auger <eric.auger@redhat.com> Eric > --- > hw/arm/virt.c | 4 ++-- > 1 file changed, 2 insertions(+), 2 deletions(-) > > diff --git a/hw/arm/virt.c b/hw/arm/virt.c > index ed6f1ac41e..8605f5058a 100644 > --- a/hw/arm/virt.c > +++ b/hw/arm/virt.c > @@ -1489,8 +1489,8 @@ static void create_pcie(VirtMachineState *vms) > qemu_fdt_setprop(ms->fdt, nodename, "dma-coherent", NULL, 0); > > if (vms->msi_phandle) { > - qemu_fdt_setprop_cells(ms->fdt, nodename, "msi-parent", > - vms->msi_phandle); > + qemu_fdt_setprop_cells(ms->fdt, nodename, "msi-map", > + 0, vms->msi_phandle, 0, 0x10000); > } > > qemu_fdt_setprop_sized_cells(ms->fdt, nodename, "reg",
diff --git a/hw/arm/virt.c b/hw/arm/virt.c index ed6f1ac41e..8605f5058a 100644 --- a/hw/arm/virt.c +++ b/hw/arm/virt.c @@ -1489,8 +1489,8 @@ static void create_pcie(VirtMachineState *vms) qemu_fdt_setprop(ms->fdt, nodename, "dma-coherent", NULL, 0); if (vms->msi_phandle) { - qemu_fdt_setprop_cells(ms->fdt, nodename, "msi-parent", - vms->msi_phandle); + qemu_fdt_setprop_cells(ms->fdt, nodename, "msi-map", + 0, vms->msi_phandle, 0, 0x10000); } qemu_fdt_setprop_sized_cells(ms->fdt, nodename, "reg",
The "msi-parent" property can be used on the PCI node when MSIs do not contain sideband data (device IDs) [1]. In QEMU, MSI transactions contain the requester ID, so the PCI node should use the "msi-map" property instead of "msi-parent". In our case the property describes an identity map between requester ID and sideband data. This fixes a warning when passing the DTB generated by QEMU to dtc, following a recent change to the GICv3 node: Warning (msi_parent_property): /pcie@10000000:msi-parent: property size (4) too small for cell size 1 [1] linux/Documentation/devicetree/bindings/pci/pci-msi.txt Signed-off-by: Jean-Philippe Brucker <jean-philippe@linaro.org> --- hw/arm/virt.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)