diff options
Diffstat (limited to 'hw/ppc/spapr_vio.c')
| -rw-r--r-- | hw/ppc/spapr_vio.c | 649 |
1 files changed, 649 insertions, 0 deletions
diff --git a/hw/ppc/spapr_vio.c b/hw/ppc/spapr_vio.c new file mode 100644 index 0000000000..6eb3ab5482 --- /dev/null +++ b/hw/ppc/spapr_vio.c @@ -0,0 +1,649 @@ +/* + * QEMU sPAPR VIO code + * + * Copyright (c) 2010 David Gibson, IBM Corporation <dwg@au1.ibm.com> + * Based on the s390 virtio bus code: + * Copyright (c) 2009 Alexander Graf <agraf@suse.de> + * + * 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 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 <http://www.gnu.org/licenses/>. + */ + +#include "hw/hw.h" +#include "sysemu/sysemu.h" +#include "hw/boards.h" +#include "monitor/monitor.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 "hw/spapr.h" +#include "hw/spapr_vio.h" +#include "hw/xics.h" + +#ifdef CONFIG_FDT +#include <libfdt.h> +#endif /* CONFIG_FDT */ + +/* #define DEBUG_SPAPR */ + +#ifdef DEBUG_SPAPR +#define dprintf(fmt, ...) \ + do { fprintf(stderr, fmt, ## __VA_ARGS__); } while (0) +#else +#define dprintf(fmt, ...) \ + do { } while (0) +#endif + +static Property spapr_vio_props[] = { + DEFINE_PROP_UINT32("irq", VIOsPAPRDevice, irq, 0), \ + DEFINE_PROP_END_OF_LIST(), +}; + +static const TypeInfo spapr_vio_bus_info = { + .name = TYPE_SPAPR_VIO_BUS, + .parent = TYPE_BUS, + .instance_size = sizeof(VIOsPAPRBus), +}; + +VIOsPAPRDevice *spapr_vio_find_by_reg(VIOsPAPRBus *bus, uint32_t reg) +{ + BusChild *kid; + VIOsPAPRDevice *dev = NULL; + + QTAILQ_FOREACH(kid, &bus->bus.children, sibling) { + dev = (VIOsPAPRDevice *)kid->child; + if (dev->reg == reg) { + return dev; + } + } + + return NULL; +} + +static char *vio_format_dev_name(VIOsPAPRDevice *dev) +{ + VIOsPAPRDeviceClass *pc = VIO_SPAPR_DEVICE_GET_CLASS(dev); + char *name; + + /* Device tree style name device@reg */ + name = g_strdup_printf("%s@%x", pc->dt_name, dev->reg); + + return name; +} + +#ifdef CONFIG_FDT +static int vio_make_devnode(VIOsPAPRDevice *dev, + void *fdt) +{ + VIOsPAPRDeviceClass *pc = VIO_SPAPR_DEVICE_GET_CLASS(dev); + int vdevice_off, node_off, ret; + char *dt_name; + + vdevice_off = fdt_path_offset(fdt, "/vdevice"); + if (vdevice_off < 0) { + return vdevice_off; + } + + dt_name = vio_format_dev_name(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->dt_compatible) { + ret = fdt_setprop_string(fdt, node_off, "compatible", + pc->dt_compatible); + if (ret < 0) { + return ret; + } + } + + if (dev->irq) { + uint32_t ints_prop[] = {cpu_to_be32(dev->irq), 0}; + + 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->dma); + if (ret < 0) { + return ret; + } + + if (pc->devnode) { + ret = (pc->devnode)(dev, fdt, node_off); + if (ret < 0) { + return ret; + } + } + + return node_off; +} +#endif /* CONFIG_FDT */ + +/* + * CRQ handling + */ +static target_ulong h_reg_crq(PowerPCCPU *cpu, sPAPREnvironment *spapr, + target_ulong opcode, target_ulong *args) +{ + target_ulong reg = args[0]; + target_ulong queue_addr = args[1]; + target_ulong queue_len = args[2]; + VIOsPAPRDevice *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; + + dprintf("CRQ for dev 0x" TARGET_FMT_lx " registered at 0x" + TARGET_FMT_lx "/0x" TARGET_FMT_lx "\n", + reg, queue_addr, queue_len); + return H_SUCCESS; +} + +static target_ulong free_crq(VIOsPAPRDevice *dev) +{ + dev->crq.qladdr = 0; + dev->crq.qsize = 0; + dev->crq.qnext = 0; + + dprintf("CRQ for dev 0x%" PRIx32 " freed\n", dev->reg); + + return H_SUCCESS; +} + +static target_ulong h_free_crq(PowerPCCPU *cpu, sPAPREnvironment *spapr, + target_ulong opcode, target_ulong *args) +{ + target_ulong reg = args[0]; + VIOsPAPRDevice *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, sPAPREnvironment *spapr, + target_ulong opcode, target_ulong *args) +{ + target_ulong reg = args[0]; + target_ulong msg_hi = args[1]; + target_ulong msg_lo = args[2]; + VIOsPAPRDevice *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, sPAPREnvironment *spapr, + target_ulong opcode, target_ulong *args) +{ + target_ulong reg = args[0]; + VIOsPAPRDevice *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(VIOsPAPRDevice *dev, uint8_t *crq) +{ + int rc; + uint8_t byte; + + if (!dev->crq.qsize) { + fprintf(stderr, "spapr_vio_send_creq on uninitialized queue\n"); + 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) { + qemu_irq_pulse(spapr_vio_qirq(dev)); + } + + return 0; +} + +/* "quiesce" handling */ + +static void spapr_vio_quiesce_one(VIOsPAPRDevice *dev) +{ + if (dev->dma) { + spapr_tce_reset(dev->dma); + } + free_crq(dev); +} + +static void rtas_set_tce_bypass(sPAPREnvironment *spapr, uint32_t token, + uint32_t nargs, target_ulong args, + uint32_t nret, target_ulong rets) +{ + VIOsPAPRBus *bus = spapr->vio_bus; + VIOsPAPRDevice *dev; + uint32_t unit, enable; + + if (nargs != 2) { + rtas_st(rets, 0, -3); + 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, -3); + return; + } + + if (!dev->dma) { + rtas_st(rets, 0, -3); + return; + } + + spapr_tce_set_bypass(dev->dma, !!enable); + + rtas_st(rets, 0, 0); +} + +static void rtas_quiesce(sPAPREnvironment *spapr, uint32_t token, + uint32_t nargs, target_ulong args, + uint32_t nret, target_ulong rets) +{ + VIOsPAPRBus *bus = spapr->vio_bus; + BusChild *kid; + VIOsPAPRDevice *dev = NULL; + + if (nargs != 0) { + rtas_st(rets, 0, -3); + return; + } + + QTAILQ_FOREACH(kid, &bus->bus.children, sibling) { + dev = (VIOsPAPRDevice *)kid->child; + spapr_vio_quiesce_one(dev); + } + + rtas_st(rets, 0, 0); +} + +static VIOsPAPRDevice *reg_conflict(VIOsPAPRDevice *dev) +{ + VIOsPAPRBus *bus = DO_UPCAST(VIOsPAPRBus, bus, dev->qdev.parent_bus); + BusChild *kid; + VIOsPAPRDevice *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 = DO_UPCAST(VIOsPAPRDevice, qdev, kid->child); + + if (other != dev && other->reg == dev->reg) { + return other; + } + } + + return 0; +} + +static void spapr_vio_busdev_reset(DeviceState *qdev) +{ + VIOsPAPRDevice *dev = DO_UPCAST(VIOsPAPRDevice, qdev, qdev); + VIOsPAPRDeviceClass *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; + + if (pc->reset) { + pc->reset(dev); + } +} + +static int spapr_vio_busdev_init(DeviceState *qdev) +{ + VIOsPAPRDevice *dev = (VIOsPAPRDevice *)qdev; + VIOsPAPRDeviceClass *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. + */ + VIOsPAPRDevice *other = reg_conflict(dev); + + if (other) { + fprintf(stderr, "vio: %s and %s devices conflict at address %#x\n", + object_get_typename(OBJECT(qdev)), + object_get_typename(OBJECT(&other->qdev)), + dev->reg); + return -1; + } + } else { + /* Need to assign an address */ + VIOsPAPRBus *bus = DO_UPCAST(VIOsPAPRBus, 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 = vio_format_dev_name(dev); + dev->qdev.id = id; + } + + dev->irq = spapr_allocate_msi(dev->irq); + if (!dev->irq) { + return -1; + } + + if (pc->rtce_window_size) { + uint32_t liobn = SPAPR_VIO_BASE_LIOBN | dev->reg; + dev->dma = spapr_tce_new_dma_context(liobn, pc->rtce_window_size); + } + + return pc->init(dev); +} + +static target_ulong h_vio_signal(PowerPCCPU *cpu, sPAPREnvironment *spapr, + target_ulong opcode, + target_ulong *args) +{ + target_ulong reg = args[0]; + target_ulong mode = args[1]; + VIOsPAPRDevice *dev = spapr_vio_find_by_reg(spapr->vio_bus, reg); + VIOsPAPRDeviceClass *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; +} + +VIOsPAPRBus *spapr_vio_bus_init(void) +{ + VIOsPAPRBus *bus; + BusState *qbus; + DeviceState *dev; + + /* Create bridge device */ + dev = qdev_create(NULL, "spapr-vio-bridge"); + qdev_init_nofail(dev); + + /* Create bus on bridge device */ + + qbus = qbus_create(TYPE_SPAPR_VIO_BUS, dev, "spapr-vio"); + bus = DO_UPCAST(VIOsPAPRBus, bus, qbus); + bus->next_reg = 0x71000000; + + /* 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("ibm,set-tce-bypass", rtas_set_tce_bypass); + spapr_rtas_register("quiesce", rtas_quiesce); + + return bus; +} + +/* Represents sPAPR hcall VIO devices */ + +static int spapr_vio_bridge_init(SysBusDevice *dev) +{ + /* nothing */ + return 0; +} + +static void spapr_vio_bridge_class_init(ObjectClass *klass, void *data) +{ + DeviceClass *dc = DEVICE_CLASS(klass); + SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass); + + k->init = spapr_vio_bridge_init; + dc->no_user = 1; +} + +static const TypeInfo spapr_vio_bridge_info = { + .name = "spapr-vio-bridge", + .parent = TYPE_SYS_BUS_DEVICE, + .instance_size = sizeof(SysBusDevice), + .class_init = spapr_vio_bridge_class_init, +}; + +static void vio_spapr_device_class_init(ObjectClass *klass, void *data) +{ + DeviceClass *k = DEVICE_CLASS(klass); + k->init = spapr_vio_busdev_init; + k->reset = spapr_vio_busdev_reset; + k->bus_type = TYPE_SPAPR_VIO_BUS; + k->props = spapr_vio_props; +} + +static const TypeInfo spapr_vio_type_info = { + .name = TYPE_VIO_SPAPR_DEVICE, + .parent = TYPE_DEVICE, + .instance_size = sizeof(VIOsPAPRDevice), + .abstract = true, + .class_size = sizeof(VIOsPAPRDeviceClass), + .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) + +#ifdef CONFIG_FDT +static int compare_reg(const void *p1, const void *p2) +{ + VIOsPAPRDevice const *dev1, *dev2; + + dev1 = (VIOsPAPRDevice *)*(DeviceState **)p1; + dev2 = (VIOsPAPRDevice *)*(DeviceState **)p2; + + if (dev1->reg < dev2->reg) { + return -1; + } + if (dev1->reg == dev2->reg) { + return 0; + } + + /* dev1->reg > dev2->reg */ + return 1; +} + +int spapr_populate_vdevice(VIOsPAPRBus *bus, void *fdt) +{ + DeviceState *qdev, **qdevs; + BusChild *kid; + int i, num, ret = 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_malloc(sizeof(qdev) * 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--) { + VIOsPAPRDevice *dev = (VIOsPAPRDevice *)(qdevs[i]); + + ret = vio_make_devnode(dev, fdt); + + if (ret < 0) { + goto out; + } + } + + ret = 0; +out: + free(qdevs); + + return ret; +} + +int spapr_populate_chosen_stdout(void *fdt, VIOsPAPRBus *bus) +{ + VIOsPAPRDevice *dev; + char *name, *path; + int ret, offset; + + dev = spapr_vty_get_default(bus); + if (!dev) + return 0; + + offset = fdt_path_offset(fdt, "/chosen"); + if (offset < 0) { + return offset; + } + + name = vio_format_dev_name(dev); + path = g_strdup_printf("/vdevice/%s", name); + + ret = fdt_setprop_string(fdt, offset, "linux,stdout-path", path); + + g_free(name); + g_free(path); + + return ret; +} +#endif /* CONFIG_FDT */ |