From c20d332a85c95245e3b720bfea1bd02e3a311463 Mon Sep 17 00:00:00 2001 From: Bharata B Rao Date: Tue, 1 Sep 2015 11:22:35 +1000 Subject: [PATCH] spapr: Memory hotplug support Make use of pc-dimm infrastructure to support memory hotplug for PowerPC. Signed-off-by: Bharata B Rao Reviewed-by: David Gibson Signed-off-by: David Gibson --- hw/ppc/spapr.c | 118 ++++++++++++++++++++++++++++++++++++++++++ hw/ppc/spapr_events.c | 8 +-- 2 files changed, 123 insertions(+), 3 deletions(-) diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c index d21e95cf6b..5b462290a5 100644 --- a/hw/ppc/spapr.c +++ b/hw/ppc/spapr.c @@ -34,6 +34,7 @@ #include "sysemu/block-backend.h" #include "sysemu/cpus.h" #include "sysemu/kvm.h" +#include "sysemu/device_tree.h" #include "kvm_ppc.h" #include "migration/migration.h" #include "mmu-hash64.h" @@ -862,6 +863,7 @@ static void spapr_finalize_fdt(sPAPRMachineState *spapr, hwaddr rtas_size) { MachineState *machine = MACHINE(qdev_get_machine()); + sPAPRMachineClass *smc = SPAPR_MACHINE_GET_CLASS(machine); const char *boot_device = machine->boot_order; int ret, i; size_t cb = 0; @@ -945,6 +947,10 @@ static void spapr_finalize_fdt(sPAPRMachineState *spapr, spapr_populate_chosen_stdout(fdt, spapr->vio_bus); } + if (smc->dr_lmb_enabled) { + _FDT(spapr_drc_populate_dt(fdt, 0, NULL, SPAPR_DR_CONNECTOR_TYPE_LMB)); + } + _FDT((fdt_pack(fdt))); if (fdt_totalsize(fdt) > FDT_MAX_SIZE) { @@ -2055,12 +2061,120 @@ static void spapr_nmi(NMIState *n, int cpu_index, Error **errp) } } +static void spapr_add_lmbs(DeviceState *dev, uint64_t addr, uint64_t size, + uint32_t node, Error **errp) +{ + sPAPRDRConnector *drc; + sPAPRDRConnectorClass *drck; + uint32_t nr_lmbs = size/SPAPR_MEMORY_BLOCK_SIZE; + int i, fdt_offset, fdt_size; + void *fdt; + + /* + * Check for DRC connectors and send hotplug notification to the + * guest only in case of hotplugged memory. This allows cold plugged + * memory to be specified at boot time. + */ + if (!dev->hotplugged) { + return; + } + + for (i = 0; i < nr_lmbs; i++) { + drc = spapr_dr_connector_by_id(SPAPR_DR_CONNECTOR_TYPE_LMB, + addr/SPAPR_MEMORY_BLOCK_SIZE); + g_assert(drc); + + fdt = create_device_tree(&fdt_size); + fdt_offset = spapr_populate_memory_node(fdt, node, addr, + SPAPR_MEMORY_BLOCK_SIZE); + + drck = SPAPR_DR_CONNECTOR_GET_CLASS(drc); + drck->attach(drc, dev, fdt, fdt_offset, !dev->hotplugged, errp); + spapr_hotplug_req_add_event(drc); + addr += SPAPR_MEMORY_BLOCK_SIZE; + } +} + +static void spapr_memory_plug(HotplugHandler *hotplug_dev, DeviceState *dev, + uint32_t node, Error **errp) +{ + Error *local_err = NULL; + sPAPRMachineState *ms = SPAPR_MACHINE(hotplug_dev); + PCDIMMDevice *dimm = PC_DIMM(dev); + PCDIMMDeviceClass *ddc = PC_DIMM_GET_CLASS(dimm); + MemoryRegion *mr = ddc->get_memory_region(dimm); + uint64_t align = memory_region_get_alignment(mr); + uint64_t size = memory_region_size(mr); + uint64_t addr; + + if (size % SPAPR_MEMORY_BLOCK_SIZE) { + error_setg(&local_err, "Hotplugged memory size must be a multiple of " + "%lld MB", SPAPR_MEMORY_BLOCK_SIZE/M_BYTE); + goto out; + } + + pc_dimm_memory_plug(dev, &ms->hotplug_memory, mr, align, &local_err); + if (local_err) { + goto out; + } + + addr = object_property_get_int(OBJECT(dimm), PC_DIMM_ADDR_PROP, &local_err); + if (local_err) { + pc_dimm_memory_unplug(dev, &ms->hotplug_memory, mr); + goto out; + } + + spapr_add_lmbs(dev, addr, size, node, &error_abort); + +out: + error_propagate(errp, local_err); +} + +static void spapr_machine_device_plug(HotplugHandler *hotplug_dev, + DeviceState *dev, Error **errp) +{ + sPAPRMachineClass *smc = SPAPR_MACHINE_GET_CLASS(qdev_get_machine()); + + if (object_dynamic_cast(OBJECT(dev), TYPE_PC_DIMM)) { + uint32_t node; + + if (!smc->dr_lmb_enabled) { + error_setg(errp, "Memory hotplug not supported for this machine"); + return; + } + node = object_property_get_int(OBJECT(dev), PC_DIMM_NODE_PROP, errp); + if (*errp) { + return; + } + + spapr_memory_plug(hotplug_dev, dev, node, errp); + } +} + +static void spapr_machine_device_unplug(HotplugHandler *hotplug_dev, + DeviceState *dev, Error **errp) +{ + if (object_dynamic_cast(OBJECT(dev), TYPE_PC_DIMM)) { + error_setg(errp, "Memory hot unplug not supported by sPAPR"); + } +} + +static HotplugHandler *spapr_get_hotpug_handler(MachineState *machine, + DeviceState *dev) +{ + if (object_dynamic_cast(OBJECT(dev), TYPE_PC_DIMM)) { + return HOTPLUG_HANDLER(machine); + } + return NULL; +} + static void spapr_machine_class_init(ObjectClass *oc, void *data) { MachineClass *mc = MACHINE_CLASS(oc); sPAPRMachineClass *smc = SPAPR_MACHINE_CLASS(oc); FWPathProviderClass *fwc = FW_PATH_PROVIDER_CLASS(oc); NMIClass *nc = NMI_CLASS(oc); + HotplugHandlerClass *hc = HOTPLUG_HANDLER_CLASS(oc); mc->init = ppc_spapr_init; mc->reset = ppc_spapr_reset; @@ -2072,6 +2186,9 @@ static void spapr_machine_class_init(ObjectClass *oc, void *data) mc->kvm_type = spapr_kvm_type; mc->has_dynamic_sysbus = true; mc->pci_allow_0_address = true; + mc->get_hotplug_handler = spapr_get_hotpug_handler; + hc->plug = spapr_machine_device_plug; + hc->unplug = spapr_machine_device_unplug; smc->dr_lmb_enabled = false; fwc->get_dev_path = spapr_get_fw_dev_path; @@ -2089,6 +2206,7 @@ static const TypeInfo spapr_machine_info = { .interfaces = (InterfaceInfo[]) { { TYPE_FW_PATH_PROVIDER }, { TYPE_NMI }, + { TYPE_HOTPLUG_HANDLER }, { } }, }; diff --git a/hw/ppc/spapr_events.c b/hw/ppc/spapr_events.c index f626eb7b34..98bf7aedfc 100644 --- a/hw/ppc/spapr_events.c +++ b/hw/ppc/spapr_events.c @@ -427,14 +427,16 @@ static void spapr_hotplug_req_event(sPAPRDRConnector *drc, uint8_t hp_action) hp->hdr.section_length = cpu_to_be16(sizeof(*hp)); hp->hdr.section_version = 1; /* includes extended modifier */ hp->hotplug_action = hp_action; - + hp->drc.index = cpu_to_be32(drck->get_index(drc)); + hp->hotplug_identifier = RTAS_LOG_V6_HP_ID_DRC_INDEX; switch (drc_type) { case SPAPR_DR_CONNECTOR_TYPE_PCI: - hp->drc.index = cpu_to_be32(drck->get_index(drc)); - hp->hotplug_identifier = RTAS_LOG_V6_HP_ID_DRC_INDEX; hp->hotplug_type = RTAS_LOG_V6_HP_TYPE_PCI; break; + case SPAPR_DR_CONNECTOR_TYPE_LMB: + hp->hotplug_type = RTAS_LOG_V6_HP_TYPE_MEMORY; + break; default: /* we shouldn't be signaling hotplug events for resources * that don't support them