| Message ID | 20240916173518.1843023-3-Jonathan.Cameron@huawei.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | hw/cxl: Link speed and width control | expand |
On Mon, Sep 16, 2024 at 06:35:14PM +0100, Jonathan Cameron wrote: > Copied from gen_pcie_root_port.c > Drop the previous code that ensured a valid value in s->width, s->speed > as now a default is provided so this will always be set. > > Note this changes the default settings but it is unlikely to have a negative > effect on software as will only affect ports with now downstream device. > All other ports will use the settings from that device. > > Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> > --- > hw/pci-bridge/cxl_downstream.c | 23 ++++++++++------------- > 1 file changed, 10 insertions(+), 13 deletions(-) > > diff --git a/hw/pci-bridge/cxl_downstream.c b/hw/pci-bridge/cxl_downstream.c > index 4b42984360..c347ac06f3 100644 > --- a/hw/pci-bridge/cxl_downstream.c > +++ b/hw/pci-bridge/cxl_downstream.c > @@ -13,6 +13,8 @@ > #include "hw/pci/msi.h" > #include "hw/pci/pcie.h" > #include "hw/pci/pcie_port.h" > +#include "hw/qdev-properties.h" > +#include "hw/qdev-properties-system.h" > #include "hw/cxl/cxl.h" > #include "qapi/error.h" > > @@ -210,24 +212,20 @@ static void cxl_dsp_exitfn(PCIDevice *d) > pci_bridge_exitfn(d); > } > > -static void cxl_dsp_instance_post_init(Object *obj) > -{ > - PCIESlot *s = PCIE_SLOT(obj); > - > - if (!s->speed) { > - s->speed = QEMU_PCI_EXP_LNK_2_5GT; > - } > - > - if (!s->width) { > - s->width = QEMU_PCI_EXP_LNK_X1; > - } > -} > +static Property cxl_dsp_props[] = { > + DEFINE_PROP_PCIE_LINK_SPEED("x-speed", PCIESlot, > + speed, PCIE_LINK_SPEED_64), > + DEFINE_PROP_PCIE_LINK_WIDTH("x-width", PCIESlot, > + width, PCIE_LINK_WIDTH_16), Not sure why. For the root port, we use PCIE_LINK_WIDTH_32, and here it is PCIE_LINK_WIDTH_16? Fan > + DEFINE_PROP_END_OF_LIST() > +}; > > static void cxl_dsp_class_init(ObjectClass *oc, void *data) > { > DeviceClass *dc = DEVICE_CLASS(oc); > PCIDeviceClass *k = PCI_DEVICE_CLASS(oc); > > + device_class_set_props(dc, cxl_dsp_props); > k->config_write = cxl_dsp_config_write; > k->realize = cxl_dsp_realize; > k->exit = cxl_dsp_exitfn; > @@ -243,7 +241,6 @@ static const TypeInfo cxl_dsp_info = { > .name = TYPE_CXL_DSP, > .instance_size = sizeof(CXLDownstreamPort), > .parent = TYPE_PCIE_SLOT, > - .instance_post_init = cxl_dsp_instance_post_init, > .class_init = cxl_dsp_class_init, > .interfaces = (InterfaceInfo[]) { > { INTERFACE_PCIE_DEVICE }, > -- > 2.43.0 >
On Tue, 29 Oct 2024 09:37:59 -0700 Fan Ni <nifan.cxl@gmail.com> wrote: > On Mon, Sep 16, 2024 at 06:35:14PM +0100, Jonathan Cameron wrote: > > Copied from gen_pcie_root_port.c > > Drop the previous code that ensured a valid value in s->width, s->speed > > as now a default is provided so this will always be set. > > > > Note this changes the default settings but it is unlikely to have a negative > > effect on software as will only affect ports with now downstream device. > > All other ports will use the settings from that device. > > > > Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> > > --- > > hw/pci-bridge/cxl_downstream.c | 23 ++++++++++------------- > > 1 file changed, 10 insertions(+), 13 deletions(-) > > > > diff --git a/hw/pci-bridge/cxl_downstream.c b/hw/pci-bridge/cxl_downstream.c > > index 4b42984360..c347ac06f3 100644 > > --- a/hw/pci-bridge/cxl_downstream.c > > +++ b/hw/pci-bridge/cxl_downstream.c > > @@ -13,6 +13,8 @@ > > #include "hw/pci/msi.h" > > #include "hw/pci/pcie.h" > > #include "hw/pci/pcie_port.h" > > +#include "hw/qdev-properties.h" > > +#include "hw/qdev-properties-system.h" > > #include "hw/cxl/cxl.h" > > #include "qapi/error.h" > > > > @@ -210,24 +212,20 @@ static void cxl_dsp_exitfn(PCIDevice *d) > > pci_bridge_exitfn(d); > > } > > > > -static void cxl_dsp_instance_post_init(Object *obj) > > -{ > > - PCIESlot *s = PCIE_SLOT(obj); > > - > > - if (!s->speed) { > > - s->speed = QEMU_PCI_EXP_LNK_2_5GT; > > - } > > - > > - if (!s->width) { > > - s->width = QEMU_PCI_EXP_LNK_X1; > > - } > > -} > > +static Property cxl_dsp_props[] = { > > + DEFINE_PROP_PCIE_LINK_SPEED("x-speed", PCIESlot, > > + speed, PCIE_LINK_SPEED_64), > > + DEFINE_PROP_PCIE_LINK_WIDTH("x-width", PCIESlot, > > + width, PCIE_LINK_WIDTH_16), > > Not sure why. For the root port, we use PCIE_LINK_WIDTH_32, and here it is > PCIE_LINK_WIDTH_16? Random choice. There is no obvious default to choose. I'm fine changing them to another choice if that makes more sense. Jonathan > > Fan > > > + DEFINE_PROP_END_OF_LIST() > > +}; > > > > static void cxl_dsp_class_init(ObjectClass *oc, void *data) > > { > > DeviceClass *dc = DEVICE_CLASS(oc); > > PCIDeviceClass *k = PCI_DEVICE_CLASS(oc); > > > > + device_class_set_props(dc, cxl_dsp_props); > > k->config_write = cxl_dsp_config_write; > > k->realize = cxl_dsp_realize; > > k->exit = cxl_dsp_exitfn; > > @@ -243,7 +241,6 @@ static const TypeInfo cxl_dsp_info = { > > .name = TYPE_CXL_DSP, > > .instance_size = sizeof(CXLDownstreamPort), > > .parent = TYPE_PCIE_SLOT, > > - .instance_post_init = cxl_dsp_instance_post_init, > > .class_init = cxl_dsp_class_init, > > .interfaces = (InterfaceInfo[]) { > > { INTERFACE_PCIE_DEVICE }, > > -- > > 2.43.0 > > >
diff --git a/hw/pci-bridge/cxl_downstream.c b/hw/pci-bridge/cxl_downstream.c index 4b42984360..c347ac06f3 100644 --- a/hw/pci-bridge/cxl_downstream.c +++ b/hw/pci-bridge/cxl_downstream.c @@ -13,6 +13,8 @@ #include "hw/pci/msi.h" #include "hw/pci/pcie.h" #include "hw/pci/pcie_port.h" +#include "hw/qdev-properties.h" +#include "hw/qdev-properties-system.h" #include "hw/cxl/cxl.h" #include "qapi/error.h" @@ -210,24 +212,20 @@ static void cxl_dsp_exitfn(PCIDevice *d) pci_bridge_exitfn(d); } -static void cxl_dsp_instance_post_init(Object *obj) -{ - PCIESlot *s = PCIE_SLOT(obj); - - if (!s->speed) { - s->speed = QEMU_PCI_EXP_LNK_2_5GT; - } - - if (!s->width) { - s->width = QEMU_PCI_EXP_LNK_X1; - } -} +static Property cxl_dsp_props[] = { + DEFINE_PROP_PCIE_LINK_SPEED("x-speed", PCIESlot, + speed, PCIE_LINK_SPEED_64), + DEFINE_PROP_PCIE_LINK_WIDTH("x-width", PCIESlot, + width, PCIE_LINK_WIDTH_16), + DEFINE_PROP_END_OF_LIST() +}; static void cxl_dsp_class_init(ObjectClass *oc, void *data) { DeviceClass *dc = DEVICE_CLASS(oc); PCIDeviceClass *k = PCI_DEVICE_CLASS(oc); + device_class_set_props(dc, cxl_dsp_props); k->config_write = cxl_dsp_config_write; k->realize = cxl_dsp_realize; k->exit = cxl_dsp_exitfn; @@ -243,7 +241,6 @@ static const TypeInfo cxl_dsp_info = { .name = TYPE_CXL_DSP, .instance_size = sizeof(CXLDownstreamPort), .parent = TYPE_PCIE_SLOT, - .instance_post_init = cxl_dsp_instance_post_init, .class_init = cxl_dsp_class_init, .interfaces = (InterfaceInfo[]) { { INTERFACE_PCIE_DEVICE },
Copied from gen_pcie_root_port.c Drop the previous code that ensured a valid value in s->width, s->speed as now a default is provided so this will always be set. Note this changes the default settings but it is unlikely to have a negative effect on software as will only affect ports with now downstream device. All other ports will use the settings from that device. Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> --- hw/pci-bridge/cxl_downstream.c | 23 ++++++++++------------- 1 file changed, 10 insertions(+), 13 deletions(-)