/* * QEMU sPAPR VIO code * * Copyright (c) 2010 David Gibson, IBM Corporation * Based on the s390 virtio bus code: * Copyright (c) 2009 Alexander Graf * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * This library 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 * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, see . */ #include "qemu/osdep.h" #include "qemu/error-report.h" #include "qapi/error.h" #include "qapi/visitor.h" #include "qemu/log.h" #include "hw/loader.h" #include "elf.h" #include "hw/sysbus.h" #include "sysemu/kvm.h" #include "sysemu/device_tree.h" #include "kvm_ppc.h" #include "migration/vmstate.h" #include "sysemu/qtest.h" #include "hw/ppc/spapr.h" #include "hw/ppc/spapr_vio.h" #include "hw/ppc/fdt.h" #include "trace.h" #include #define SPAPR_VIO_REG_BASE 0x71000000 static char *spapr_vio_get_dev_name(DeviceState *qdev) { SpaprVioDevice *dev = VIO_SPAPR_DEVICE(qdev); SpaprVioDeviceClass *pc = VIO_SPAPR_DEVICE_GET_CLASS(dev); /* Device tree style name device@reg */ return g_strdup_printf("%s@%x", pc->dt_name, dev->reg); } static void spapr_vio_bus_class_init(ObjectClass *klass, void *data) { BusClass *k = BUS_CLASS(klass); k->get_dev_path = spapr_vio_get_dev_name; k->get_fw_dev_path = spapr_vio_get_dev_name; } static const TypeInfo spapr_vio_bus_info = { .name = TYPE_SPAPR_VIO_BUS, .parent = TYPE_BUS, .class_init = spapr_vio_bus_class_init, .instance_size = sizeof(SpaprVioBus), }; SpaprVioDevice *spapr_vio_find_by_reg(SpaprVioBus *bus, uint32_t reg) { BusChild *kid; SpaprVioDevice *dev = NULL; QTAILQ_FOREACH(kid, &bus->bus.children, sibling) { dev = (SpaprVioDevice *)kid->child; if (dev->reg == reg) { return dev; } } return NULL; } static int vio_make_devnode(SpaprVioDevice *dev, void *fdt) { SpaprVioDeviceClass *pc = VIO_SPAPR_DEVICE_GET_CLASS(dev); int vdevice_off, node_off, ret; char *dt_name; const char *dt_compatible; vdevice_off = fdt_path_offset(fdt, "/vdevice"); if (vdevice_off < 0) { return vdevice_off; } dt_name = spapr_vio_get_dev_name(DEVICE(dev)); node_off = fdt_add_subnode(fdt, vdevice_off, dt_name); g_free(dt_name); if (node_off < 0) { return node_off; } ret = fdt_setprop_cell(fdt, node_off, "reg", dev->reg); if (ret < 0) { return ret; } if (pc->dt_type) { ret = fdt_setprop_string(fdt, node_off, "device_type", pc->dt_type); if (ret < 0) { return ret; } } if (pc->get_dt_compatible) { dt_compatible = pc->get_dt_compatible(dev); } else { dt_compatible = pc->dt_compatible; } if (dt_compatible) { ret = fdt_setprop_string(fdt, node_off, "compatible", dt_compatible); if (ret < 0) { return ret; } } if (dev->irq) { uint32_t ints_prop[2]; spapr_dt_irq(ints_prop, dev->irq, false); ret = fdt_setprop(fdt, node_off, "interrupts", ints_prop, sizeof(ints_prop)); if (ret < 0) { return ret; } } ret = spapr_tcet_dma_dt(fdt, node_off, "ibm,my-dma-window", dev->tcet); if (ret < 0) { return ret; } if (pc->devnode) { ret = (pc->devnode)(dev, fdt, node_off); if (ret < 0) { return ret; } } return node_off; } /* * CRQ handling */ static target_ulong h_reg_crq(PowerPCCPU *cpu, SpaprMachineState *spapr, target_ulong opcode, target_ulong *args) { target_ulong reg = args[0]; target_ulong queue_addr = args[1]; target_ulong queue_len = args[2]; SpaprVioDevice *dev = spapr_vio_find_by_reg(spapr->vio_bus, reg); if (!dev) { hcall_dprintf("Unit 0x" TARGET_FMT_lx " does not exist\n", reg); return H_PARAMETER; } /* We can't grok a queue size bigger than 256M for now */ if (queue_len < 0x1000 || queue_len > 0x10000000) { hcall_dprintf("Queue size too small or too big (0x" TARGET_FMT_lx ")\n", queue_len); return H_PARAMETER; } /* Check queue alignment */ if (queue_addr & 0xfff) { hcall_dprintf("Queue not aligned (0x" TARGET_FMT_lx ")\n", queue_addr); return H_PARAMETER; } /* Check if device supports CRQs */ if (!dev->crq.SendFunc) { hcall_dprintf("Device does not support CRQ\n"); return H_NOT_FOUND; } /* Already a queue ? */ if (dev->crq.qsize) { hcall_dprintf("CRQ already registered\n"); return H_RESOURCE; } dev->crq.qladdr = queue_addr; dev->crq.qsize = queue_len; dev->crq.qnext = 0; trace_spapr_vio_h_reg_crq(reg, queue_addr, queue_len); return H_SUCCESS; } static target_ulong free_crq(SpaprVioDevice *dev) { dev->crq.qladdr = 0; dev->crq.qsize = 0; dev->crq.qnext = 0; trace_spapr_vio_free_crq(dev->reg); return H_SUCCESS; } static target_ulong h_free_crq(PowerPCCPU *cpu, SpaprMachineState *spapr, target_ulong opcode, target_ulong *args) { target_ulong reg = args[0]; SpaprVioDevice *dev = spapr_vio_find_by_reg(spapr->vio_bus, reg); if (!dev) { hcall_dprintf("Unit 0x" TARGET_FMT_lx " does not exist\n", reg); return H_PARAMETER; } return free_crq(dev); } static target_ulong h_send_crq(PowerPCCPU *cpu, SpaprMachineState *spapr, target_ulong opcode, target_ulong *args) { target_ulong reg = args[0]; target_ulong msg_hi = args[1]; target_ulong msg_lo = args[2]; SpaprVioDevice *dev = spapr_vio_find_by_reg(spapr->vio_bus, reg); uint64_t crq_mangle[2]; if (!dev) { hcall_dprintf("Unit 0x" TARGET_FMT_lx " does not exist\n", reg); return H_PARAMETER; } crq_mangle[0] = cpu_to_be64(msg_hi); crq_mangle[1] = cpu_to_be64(msg_lo); if (dev->crq.SendFunc) { return dev->crq.SendFunc(dev, (uint8_t *)crq_mangle); } return H_HARDWARE; } static target_ulong h_enable_crq(PowerPCCPU *cpu, SpaprMachineState *spapr, target_ulong opcode, target_ulong *args) { target_ulong reg = args[0]; SpaprVioDevice *dev = spapr_vio_find_by_reg(spapr->vio_bus, reg); if (!dev) { hcall_dprintf("Unit 0x" TARGET_FMT_lx " does not exist\n", reg); return H_PARAMETER; } return 0; } /* Returns negative error, 0 success, or positive: queue full */ int spapr_vio_send_crq(SpaprVioDevice *dev, uint8_t *crq) { int rc; uint8_t byte; if (!dev->crq.qsize) { error_report("spapr_vio_send_creq on uninitialized queue"); return -1; } /* Maybe do a fast path for KVM just writing to the pages */ rc = spapr_vio_dma_read(dev, dev->crq.qladdr + dev->crq.qnext, &byte, 1); if (rc) { return rc; } if (byte != 0) { return 1; } rc = spapr_vio_dma_write(dev, dev->crq.qladdr + dev->crq.qnext + 8, &crq[8], 8); if (rc) { return rc; } kvmppc_eieio(); rc = spapr_vio_dma_write(dev, dev->crq.qladdr + dev->crq.qnext, crq, 8); if (rc) { return rc; } dev->crq.qnext = (dev->crq.qnext + 16) % dev->crq.qsize; if (dev->signal_state & 1) { spapr_vio_irq_pulse(dev); } return 0; } /* "quiesce" handling */ static void spapr_vio_quiesce_one(SpaprVioDevice *dev) { if (dev->tcet) { device_legacy_reset(DEVICE(dev->tcet)); } free_crq(dev); } void spapr_vio_set_bypass(SpaprVioDevice *dev, bool bypass) { if (!dev->tcet) { return; } memory_region_set_enabled(&dev->mrbypass, bypass); memory_region_set_enabled(spapr_tce_get_iommu(dev->tcet), !bypass); dev->tcet->bypass = bypass; } static void rtas_set_tce_bypass(PowerPCCPU *cpu, SpaprMachineState *spapr, uint32_t token, uint32_t nargs, target_ulong args, uint32_t nret, target_ulong rets) { SpaprVioBus *bus = spapr->vio_bus; SpaprVioDevice *dev; uint32_t unit, enable; if (nargs != 2) { rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR); return; } unit = rtas_ld(args, 0); enable = rtas_ld(args, 1); dev = spapr_vio_find_by_reg(bus, unit); if (!dev) { rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR); return; } if (!dev->tcet) { rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR); return; } spapr_vio_set_bypass(dev, !!enable); rtas_st(rets, 0, RTAS_OUT_SUCCESS); } static void rtas_quiesce(PowerPCCPU *cpu, SpaprMachineState *spapr, uint32_t token, uint32_t nargs, target_ulong args, uint32_t nret, target_ulong rets) { SpaprVioBus *bus = spapr->vio_bus; BusChild *kid; SpaprVioDevice *dev = NULL; if (nargs != 0) { rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR); return; } QTAILQ_FOREACH(kid, &bus->bus.children, sibling) { dev = (SpaprVioDevice *)kid->child; spapr_vio_quiesce_one(dev); } rtas_st(rets, 0, RTAS_OUT_SUCCESS); } static SpaprVioDevice *reg_conflict(SpaprVioDevice *dev) { SpaprVioBus *bus = SPAPR_VIO_BUS(dev->qdev.parent_bus); BusChild *kid; SpaprVioDevice *other; /* * Check for a device other than the given one which is already * using the requested address. We have to open code this because * the given dev might already be in the list. */ QTAILQ_FOREACH(kid, &bus->bus.children, sibling) { other = VIO_SPAPR_DEVICE(kid->child); if (other != dev && other->reg == dev->reg) { return other; } } return 0; } static void spapr_vio_busdev_reset(DeviceState *qdev) { SpaprVioDevice *dev = VIO_SPAPR_DEVICE(qdev); SpaprVioDeviceClass *pc = VIO_SPAPR_DEVICE_GET_CLASS(dev); /* Shut down the request queue and TCEs if necessary */ spapr_vio_quiesce_one(dev); dev->signal_state = 0; spapr_vio_set_bypass(dev, false); if (pc->reset) { pc->reset(dev); } } /* * The register property of a VIO device is defined in libvirt using * 0x1000 as a base register number plus a 0x1000 increment. For the * VIO tty device, the base number is changed to 0x30000000. QEMU uses * a base register number of 0x71000000 and then a simple increment. * * The formula below tries to compute a unique index number from the * register value that will be used to define the IRQ number of the * VIO device. * * A maximum of 256 VIO devices is covered. Collisions are possible * but they will be detected when the IRQ is claimed. */ static inline uint32_t spapr_vio_reg_to_irq(uint32_t reg) { uint32_t irq; if (reg >= SPAPR_VIO_REG_BASE) { /* * VIO device register values when allocated by QEMU. For * these, we simply mask the high bits to fit the overall * range: [0x00 - 0xff]. * * The nvram VIO device (reg=0x71000000) is a static device of * the pseries machine and so is always allocated by QEMU. Its * IRQ number is 0x0. */ irq = reg & 0xff; } else if (reg >= 0x30000000) { /* * VIO tty devices register values, when allocated by libvirt, * are mapped in range [0xf0 - 0xff], gives us a maximum of 16 * vtys. */ irq = 0xf0 | ((reg >> 12) & 0xf); } else { /* * Other VIO devices register values, when allocated by * libvirt, should be mapped in range [0x00 - 0xef]. Conflicts * will be detected when IRQ is claimed. */ irq = (reg >> 12) & 0xff; } return SPAPR_IRQ_VIO | irq; } static void spapr_vio_busdev_realize(DeviceState *qdev, Error **errp) { SpaprMachineState *spapr = SPAPR_MACHINE(qdev_get_machine()); SpaprVioDevice *dev = (SpaprVioDevice *)qdev; SpaprVioDeviceClass *pc = VIO_SPAPR_DEVICE_GET_CLASS(dev); char *id; if (dev->reg != -1) { /* * Explicitly assigned address, just verify that no-one else * is using it. other mechanism). We have to open code this * rather than using spapr_vio_find_by_reg() because sdev * itself is already in the list. */ SpaprVioDevice *other = reg_conflict(dev); if (other) { error_setg(errp, "%s and %s devices conflict at address %#x", object_get_typename(OBJECT(qdev)), object_get_typename(OBJECT(&other->qdev)), dev->reg); return; } } else { /* Need to assign an address */ SpaprVioBus *bus = SPAPR_VIO_BUS(dev->qdev.parent_bus); do { dev->reg = bus->next_reg++; } while (reg_conflict(dev)); } /* Don't overwrite ids assigned on the command line */ if (!dev->qdev.id) { id = spapr_vio_get_dev_name(DEVICE(dev)); dev->qdev.id = id; } dev->irq = spapr_vio_reg_to_irq(dev->reg); if (SPAPR_MACHINE_GET_CLASS(spapr)->legacy_irq_allocation) { int irq = spapr_irq_findone(spapr, errp); if (irq < 0) { return; } dev->irq = irq; } if (spapr_irq_claim(spapr, dev->irq, false, errp) < 0) { return; } if (pc->rtce_window_size) { uint32_t liobn = SPAPR_VIO_LIOBN(dev->reg); memory_region_init(&dev->mrroot, OBJECT(dev), "iommu-spapr-root", MACHINE(spapr)->ram_size); memory_region_init_alias(&dev->mrbypass, OBJECT(dev), "iommu-spapr-bypass", get_system_memory(), 0, MACHINE(spapr)->ram_size); memory_region_add_subregion_overlap(&dev->mrroot, 0, &dev->mrbypass, 1); address_space_init(&dev->as, &dev->mrroot, qdev->id); dev->tcet = spapr_tce_new_table(qdev, liobn); spapr_tce_table_enable(dev->tcet, SPAPR_TCE_PAGE_SHIFT, 0, pc->rtce_window_size >> SPAPR_TCE_PAGE_SHIFT); dev->tcet->vdev = dev; memory_region_add_subregion_overlap(&dev->mrroot, 0, spapr_tce_get_iommu(dev->tcet), 2); } pc->realize(dev, errp); } static target_ulong h_vio_signal(PowerPCCPU *cpu, SpaprMachineState *spapr, target_ulong opcode, target_ulong *args) { target_ulong reg = args[0]; target_ulong mode = args[1]; SpaprVioDevice *dev = spapr_vio_find_by_reg(spapr->vio_bus, reg); SpaprVioDeviceClass *pc; if (!dev) { return H_PARAMETER; } pc = VIO_SPAPR_DEVICE_GET_CLASS(dev); if (mode & ~pc->signal_mask) { return H_PARAMETER; } dev->signal_state = mode; return H_SUCCESS; } SpaprVioBus *spapr_vio_bus_init(void) { SpaprVioBus *bus; BusState *qbus; DeviceState *dev; /* Create bridge device */ dev = qdev_new(TYPE_SPAPR_VIO_BRIDGE); sysbus_realize_and_unref(SYS_BUS_DEVICE(dev), &error_fatal); /* Create bus on bridge device */ qbus = qbus_create(TYPE_SPAPR_VIO_BUS, dev, "spapr-vio"); bus = SPAPR_VIO_BUS(qbus); bus->next_reg = SPAPR_VIO_REG_BASE; /* hcall-vio */ spapr_register_hypercall(H_VIO_SIGNAL, h_vio_signal); /* hcall-crq */ spapr_register_hypercall(H_REG_CRQ, h_reg_crq); spapr_register_hypercall(H_FREE_CRQ, h_free_crq); spapr_register_hypercall(H_SEND_CRQ, h_send_crq); spapr_register_hypercall(H_ENABLE_CRQ, h_enable_crq); /* RTAS calls */ spapr_rtas_register(RTAS_IBM_SET_TCE_BYPASS, "ibm,set-tce-bypass", rtas_set_tce_bypass); spapr_rtas_register(RTAS_QUIESCE, "quiesce", rtas_quiesce); return bus; } static void spapr_vio_bridge_class_init(ObjectClass *klass, void *data) { DeviceClass *dc = DEVICE_CLASS(klass); dc->fw_name = "vdevice"; } static const TypeInfo spapr_vio_bridge_info = { .name = TYPE_SPAPR_VIO_BRIDGE, .parent = TYPE_SYS_BUS_DEVICE, .class_init = spapr_vio_bridge_class_init, }; const VMStateDescription vmstate_spapr_vio = { .name = "spapr_vio", .version_id = 1, .minimum_version_id = 1, .fields = (VMStateField[]) { /* Sanity check */ VMSTATE_UINT32_EQUAL(reg, SpaprVioDevice, NULL), VMSTATE_UINT32_EQUAL(irq, SpaprVioDevice, NULL), /* General VIO device state */ VMSTATE_UINT64(signal_state, SpaprVioDevice), VMSTATE_UINT64(crq.qladdr, SpaprVioDevice), VMSTATE_UINT32(crq.qsize, SpaprVioDevice), VMSTATE_UINT32(crq.qnext, SpaprVioDevice), VMSTATE_END_OF_LIST() }, }; static void vio_spapr_device_class_init(ObjectClass *klass, void *data) { DeviceClass *k = DEVICE_CLASS(klass); k->realize = spapr_vio_busdev_realize; k->reset = spapr_vio_busdev_reset; k->bus_type = TYPE_SPAPR_VIO_BUS; } static const TypeInfo spapr_vio_type_info = { .name = TYPE_VIO_SPAPR_DEVICE, .parent = TYPE_DEVICE, .instance_size = sizeof(SpaprVioDevice), .abstract = true, .class_size = sizeof(SpaprVioDeviceClass), .class_init = vio_spapr_device_class_init, }; static void spapr_vio_register_types(void) { type_register_static(&spapr_vio_bus_info); type_register_static(&spapr_vio_bridge_info); type_register_static(&spapr_vio_type_info); } type_init(spapr_vio_register_types) static int compare_reg(const void *p1, const void *p2) { SpaprVioDevice const *dev1, *dev2; dev1 = (SpaprVioDevice *)*(DeviceState **)p1; dev2 = (SpaprVioDevice *)*(DeviceState **)p2; if (dev1->reg < dev2->reg) { return -1; } if (dev1->reg == dev2->reg) { return 0; } /* dev1->reg > dev2->reg */ return 1; } void spapr_dt_vdevice(SpaprVioBus *bus, void *fdt) { DeviceState *qdev, **qdevs; BusChild *kid; int i, num, ret = 0; int node; _FDT(node = fdt_add_subnode(fdt, 0, "vdevice")); _FDT(fdt_setprop_string(fdt, node, "device_type", "vdevice")); _FDT(fdt_setprop_string(fdt, node, "compatible", "IBM,vdevice")); _FDT(fdt_setprop_cell(fdt, node, "#address-cells", 1)); _FDT(fdt_setprop_cell(fdt, node, "#size-cells", 0)); _FDT(fdt_setprop_cell(fdt, node, "#interrupt-cells", 2)); _FDT(fdt_setprop(fdt, node, "interrupt-controller", NULL, 0)); /* Count qdevs on the bus list */ num = 0; QTAILQ_FOREACH(kid, &bus->bus.children, sibling) { num++; } /* Copy out into an array of pointers */ qdevs = g_new(DeviceState *, num); num = 0; QTAILQ_FOREACH(kid, &bus->bus.children, sibling) { qdevs[num++] = kid->child; } /* Sort the array */ qsort(qdevs, num, sizeof(qdev), compare_reg); /* Hack alert. Give the devices to libfdt in reverse order, we happen * to know that will mean they are in forward order in the tree. */ for (i = num - 1; i >= 0; i--) { SpaprVioDevice *dev = (SpaprVioDevice *)(qdevs[i]); SpaprVioDeviceClass *vdc = VIO_SPAPR_DEVICE_GET_CLASS(dev); ret = vio_make_devnode(dev, fdt); if (ret < 0) { error_report("Couldn't create device node /vdevice/%s@%"PRIx32, vdc->dt_name, dev->reg); exit(1); } } g_free(qdevs); } gchar *spapr_vio_stdout_path(SpaprVioBus *bus) { SpaprVioDevice *dev; char *name, *path; dev = spapr_vty_get_default(bus); if (!dev) { return NULL; } name = spapr_vio_get_dev_name(DEVICE(dev)); path = g_strdup_printf("/vdevice/%s", name); g_free(name); return path; }