--- /dev/null
+/*
+ * 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 "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/ppc/spapr.h"
+#include "hw/ppc/spapr_vio.h"
+#include "hw/ppc/xics.h"
+
+#include <libfdt.h>
+
+/* #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 char *spapr_vio_get_dev_name(DeviceState *qdev)
+{
+ VIOsPAPRDevice *dev = VIO_SPAPR_DEVICE(qdev);
+ 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;
+}
+
+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(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 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 = 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->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->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];
+ 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, sPAPRMachineState *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, 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];
+ 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, sPAPRMachineState *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->tcet) {
+ device_reset(DEVICE(dev->tcet));
+ }
+ free_crq(dev);
+}
+
+void spapr_vio_set_bypass(VIOsPAPRDevice *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)
+{
+ VIOsPAPRBus *bus = spapr->vio_bus;
+ VIOsPAPRDevice *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)
+{
+ VIOsPAPRBus *bus = spapr->vio_bus;
+ BusChild *kid;
+ VIOsPAPRDevice *dev = NULL;
+
+ if (nargs != 0) {
+ rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
+ return;
+ }
+
+ QTAILQ_FOREACH(kid, &bus->bus.children, sibling) {
+ dev = (VIOsPAPRDevice *)kid->child;
+ spapr_vio_quiesce_one(dev);
+ }
+
+ rtas_st(rets, 0, RTAS_OUT_SUCCESS);
+}
+
+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 = VIO_SPAPR_DEVICE(kid->child);
+
+ if (other != dev && other->reg == dev->reg) {
+ return other;
+ }
+ }
+
+ return 0;
+}
+
+static void spapr_vio_busdev_reset(DeviceState *qdev)
+{
+ VIOsPAPRDevice *dev = VIO_SPAPR_DEVICE(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;
+
+ spapr_vio_set_bypass(dev, false);
+ if (pc->reset) {
+ pc->reset(dev);
+ }
+}
+
+static void spapr_vio_busdev_realize(DeviceState *qdev, Error **errp)
+{
+ sPAPRMachineState *spapr = SPAPR_MACHINE(qdev_get_machine());
+ 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) {
+ 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 */
+ 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 = spapr_vio_get_dev_name(DEVICE(dev));
+ dev->qdev.id = id;
+ }
+
+ dev->irq = xics_alloc(spapr->icp, 0, dev->irq, false);
+ if (!dev->irq) {
+ error_setg(errp, "can't allocate IRQ");
+ return;
+ }
+
+ if (pc->rtce_window_size) {
+ uint32_t liobn = SPAPR_VIO_LIOBN(dev->reg);
+
+ memory_region_init(&dev->mrroot, OBJECT(dev), "iommu-spapr-root",
+ ram_size);
+ memory_region_init_alias(&dev->mrbypass, OBJECT(dev),
+ "iommu-spapr-bypass", get_system_memory(),
+ 0, 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,
+ 0,
+ SPAPR_TCE_PAGE_SHIFT,
+ pc->rtce_window_size >>
+ SPAPR_TCE_PAGE_SHIFT, false);
+ 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];
+ 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(RTAS_IBM_SET_TCE_BYPASS, "ibm,set-tce-bypass",
+ rtas_set_tce_bypass);
+ spapr_rtas_register(RTAS_QUIESCE, "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)
+{
+ SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);
+ DeviceClass *dc = DEVICE_CLASS(klass);
+
+ dc->fw_name = "vdevice";
+ k->init = spapr_vio_bridge_init;
+}
+
+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,
+};
+
+const VMStateDescription vmstate_spapr_vio = {
+ .name = "spapr_vio",
+ .version_id = 1,
+ .minimum_version_id = 1,
+ .fields = (VMStateField[]) {
+ /* Sanity check */
+ VMSTATE_UINT32_EQUAL(reg, VIOsPAPRDevice),
+ VMSTATE_UINT32_EQUAL(irq, VIOsPAPRDevice),
+
+ /* General VIO device state */
+ VMSTATE_UINTTL(signal_state, VIOsPAPRDevice),
+ VMSTATE_UINT64(crq.qladdr, VIOsPAPRDevice),
+ VMSTATE_UINT32(crq.qsize, VIOsPAPRDevice),
+ VMSTATE_UINT32(crq.qnext, VIOsPAPRDevice),
+
+ 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;
+ 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)
+
+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:
+ g_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 = spapr_vio_get_dev_name(DEVICE(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;
+}
Code Review / kvmfornfv.git / blobdiff