On Tue, Nov 28, 2017 at 10:44:03AM +0000, Cédric Le Goater wrote: > On 11/28/2017 05:40 AM, David Gibson wrote: > > On Thu, Nov 23, 2017 at 02:29:38PM +0100, Cédric Le Goater wrote: > >> The XIVE interrupt controller uses a set of tables to redirect exception > >> from event sources to CPU threads. The Interrupt Virtualization Entry (IVE) > >> table, also known as Event Assignment Structure (EAS), is one them. > >> > >> The XIVE model is designed to make use of the full range of the IRQ > >> number space and does not use an offset like the XICS mode does. > >> Hence, the IVE table is directly indexed by the IRQ number. > >> > >> The IVE stores Event Queue data associated with a source. The lookups > >> are performed when the source is configured or when an event is > >> triggered. > >> > >> Signed-off-by: Cédric Le Goater <c...@kaod.org> > >> --- > >> default-configs/ppc64-softmmu.mak | 1 + > >> hw/intc/Makefile.objs | 1 + > >> hw/intc/spapr_xive.c | 165 > >> ++++++++++++++++++++++++++++++++++++++ > >> hw/intc/xive-internal.h | 50 ++++++++++++ > >> include/hw/ppc/spapr_xive.h | 44 ++++++++++ > >> 5 files changed, 261 insertions(+) > >> create mode 100644 hw/intc/spapr_xive.c > >> create mode 100644 hw/intc/xive-internal.h > >> create mode 100644 include/hw/ppc/spapr_xive.h > >> > >> diff --git a/default-configs/ppc64-softmmu.mak > >> b/default-configs/ppc64-softmmu.mak > >> index d1b3a6dd50f8..4a7f6a0696de 100644 > >> --- a/default-configs/ppc64-softmmu.mak > >> +++ b/default-configs/ppc64-softmmu.mak > >> @@ -56,6 +56,7 @@ CONFIG_SM501=y > >> CONFIG_XICS=$(CONFIG_PSERIES) > >> CONFIG_XICS_SPAPR=$(CONFIG_PSERIES) > >> CONFIG_XICS_KVM=$(call land,$(CONFIG_PSERIES),$(CONFIG_KVM)) > >> +CONFIG_XIVE_SPAPR=$(CONFIG_PSERIES) > >> # For PReP > >> CONFIG_SERIAL_ISA=y > >> CONFIG_MC146818RTC=y > >> diff --git a/hw/intc/Makefile.objs b/hw/intc/Makefile.objs > >> index ae358569a155..49e13e7aeeee 100644 > >> --- a/hw/intc/Makefile.objs > >> +++ b/hw/intc/Makefile.objs > >> @@ -35,6 +35,7 @@ obj-$(CONFIG_SH4) += sh_intc.o > >> obj-$(CONFIG_XICS) += xics.o > >> obj-$(CONFIG_XICS_SPAPR) += xics_spapr.o > >> obj-$(CONFIG_XICS_KVM) += xics_kvm.o > >> +obj-$(CONFIG_XIVE_SPAPR) += spapr_xive.o > >> obj-$(CONFIG_POWERNV) += xics_pnv.o > >> obj-$(CONFIG_ALLWINNER_A10_PIC) += allwinner-a10-pic.o > >> obj-$(CONFIG_S390_FLIC) += s390_flic.o > >> diff --git a/hw/intc/spapr_xive.c b/hw/intc/spapr_xive.c > >> new file mode 100644 > >> index 000000000000..b2fc3007c85f > >> --- /dev/null > >> +++ b/hw/intc/spapr_xive.c > >> @@ -0,0 +1,165 @@ > >> +/* > >> + * QEMU PowerPC sPAPR XIVE model > >> + * > >> + * Copyright (c) 2017, IBM Corporation. > >> + * > >> + * This program is free software; you can redistribute it and/or modify > >> + * it under the terms of the GNU General Public License, version 2, as > >> + * published by the Free Software Foundation. > >> + * > >> + * This program is distributed in the hope that it will be useful, > >> + * but WITHOUT ANY WARRANTY; without even the implied warranty of > >> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the > >> + * GNU General Public License for more details. > >> + * > >> + * You should have received a copy of the GNU General Public License > >> + * along with this program; if not, see <http://www.gnu.org/licenses/>. > >> + */ > >> +#include "qemu/osdep.h" > >> +#include "qemu/log.h" > >> +#include "qapi/error.h" > >> +#include "target/ppc/cpu.h" > >> +#include "sysemu/cpus.h" > >> +#include "sysemu/dma.h" > >> +#include "monitor/monitor.h" > >> +#include "hw/ppc/spapr_xive.h" > >> + > >> +#include "xive-internal.h" > >> + > >> +/* > >> + * Main XIVE object > >> + */ > >> + > >> +void spapr_xive_pic_print_info(sPAPRXive *xive, Monitor *mon) > >> +{ > >> + int i; > >> + > >> + for (i = 0; i < xive->nr_irqs; i++) { > >> + XiveIVE *ive = &xive->ivt[i]; > >> + > >> + if (!(ive->w & IVE_VALID)) { > >> + continue; > >> + } > >> + > >> + monitor_printf(mon, " %4x %s %08x %08x\n", i, > >> + ive->w & IVE_MASKED ? "M" : " ", > >> + (int) GETFIELD(IVE_EQ_INDEX, ive->w), > >> + (int) GETFIELD(IVE_EQ_DATA, ive->w)); > >> + } > >> +} > >> + > >> +void spapr_xive_reset(void *dev) > >> +{ > >> + sPAPRXive *xive = SPAPR_XIVE(dev); > >> + int i; > >> + > >> + /* Mask all valid IVEs in the IRQ number space. */ > >> + for (i = 0; i < xive->nr_irqs; i++) { > >> + XiveIVE *ive = &xive->ivt[i]; > >> + if (ive->w & IVE_VALID) { > >> + ive->w |= IVE_MASKED; > >> + } > >> + } > >> +} > >> + > >> +static void spapr_xive_realize(DeviceState *dev, Error **errp) > >> +{ > >> + sPAPRXive *xive = SPAPR_XIVE(dev); > >> + > >> + if (!xive->nr_irqs) { > >> + error_setg(errp, "Number of interrupt needs to be greater 0"); > >> + return; > >> + } > >> + > >> + /* Allocate the IVT (Interrupt Virtualization Table) */ > >> + xive->ivt = g_malloc0(xive->nr_irqs * sizeof(XiveIVE)); > >> + > >> + qemu_register_reset(spapr_xive_reset, dev); > >> +} > >> + > >> +static const VMStateDescription vmstate_spapr_xive_ive = { > >> + .name = TYPE_SPAPR_XIVE "/ive", > >> + .version_id = 1, > >> + .minimum_version_id = 1, > >> + .fields = (VMStateField []) { > >> + VMSTATE_UINT64(w, XiveIVE), > >> + VMSTATE_END_OF_LIST() > >> + }, > >> +}; > >> + > >> +static bool vmstate_spapr_xive_needed(void *opaque) > >> +{ > >> + /* TODO check machine XIVE support */ > >> + return true; > >> +} > >> + > >> +static const VMStateDescription vmstate_spapr_xive = { > >> + .name = TYPE_SPAPR_XIVE, > >> + .version_id = 1, > >> + .minimum_version_id = 1, > >> + .needed = vmstate_spapr_xive_needed, > >> + .fields = (VMStateField[]) { > >> + VMSTATE_UINT32_EQUAL(nr_irqs, sPAPRXive, NULL), > >> + VMSTATE_STRUCT_VARRAY_UINT32_ALLOC(ivt, sPAPRXive, nr_irqs, 1, > >> + vmstate_spapr_xive_ive, > >> XiveIVE), > >> + VMSTATE_END_OF_LIST() > >> + }, > >> +}; > >> + > >> +static Property spapr_xive_properties[] = { > >> + DEFINE_PROP_UINT32("nr-irqs", sPAPRXive, nr_irqs, 0), > >> + DEFINE_PROP_END_OF_LIST(), > >> +}; > >> + > >> +static void spapr_xive_class_init(ObjectClass *klass, void *data) > >> +{ > >> + DeviceClass *dc = DEVICE_CLASS(klass); > >> + > >> + dc->realize = spapr_xive_realize; > >> + dc->props = spapr_xive_properties; > >> + dc->desc = "sPAPR XIVE interrupt controller"; > >> + dc->vmsd = &vmstate_spapr_xive; > >> +} > >> + > >> +static const TypeInfo spapr_xive_info = { > >> + .name = TYPE_SPAPR_XIVE, > >> + .parent = TYPE_SYS_BUS_DEVICE, > >> + .instance_size = sizeof(sPAPRXive), > >> + .class_init = spapr_xive_class_init, > >> +}; > >> + > >> +static void spapr_xive_register_types(void) > >> +{ > >> + type_register_static(&spapr_xive_info); > >> +} > >> + > >> +type_init(spapr_xive_register_types) > >> + > >> +XiveIVE *spapr_xive_get_ive(sPAPRXive *xive, uint32_t lisn) > >> +{ > >> + return lisn < xive->nr_irqs ? &xive->ivt[lisn] : NULL; > >> +} > >> + > >> +bool spapr_xive_irq_set(sPAPRXive *xive, uint32_t lisn) > >> +{ > >> + XiveIVE *ive = spapr_xive_get_ive(xive, lisn); > >> + > >> + if (!ive) { > >> + return false; > >> + } > >> + > >> + ive->w |= IVE_VALID; > >> + return true; > >> +} > > > > As I said in another comment, I don't like the name: sets what, exactly? > > may be spapr_xive_irq_alloc() would be better ? I guess so.
Or enable/disable.
> > It's not really clear to me what the VALID bit means. Why would an
> > irq within the allocated range be invalid?
>
> 'enable' might be better a better choice but that is how the specs
> refer to this bit.
Right, definitely the VALID name for the bit constant, if that's
what's in the specs. But it still might be better to use
enable/disable for the functions to change it since that's clearer.
Unless there's something else we might want to do with the irq that
could also be called enable/disable.
> It it used by the HW to let through or stop the notification process
> immediately when a trigger is performed on the ESB MMIOs.
Ok, so the concept does exist in hardware.
--
David Gibson | I'll have my music baroque, and my code
david AT gibson.dropbear.id.au | minimalist, thank you. NOT _the_ _other_
| _way_ _around_!
http://www.ozlabs.org/~dgibson
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