RTAS is a hypervisor provided binary blob that a guest loads and calls into to execute certain functions. It's similar to the vsyscall page in Linux or the short lived VMCI paravirt interface from VMware. The QEMU implementation of the RTAS blob is simply a passthrough that proxies all RTAS calls to the hypervisor via an hypercall. While we pass a CPU argument for hypercall handling in QEMU, we don't pass it for RTAS calls. Since some RTAs calls require making hypercalls (normally RTAS is implemented as guest code) we have nasty hacks to allow that. Add a CPU argument to RTAS call handling so we can more easily invoke hypercalls just as guest code would. Signed-off-by: Anthony Liguori <aliguori@us.ibm.com> Signed-off-by: Alexander Graf <agraf@suse.de>
656 lines
16 KiB
C
656 lines
16 KiB
C
/*
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* QEMU sPAPR VIO code
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*
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* Copyright (c) 2010 David Gibson, IBM Corporation <dwg@au1.ibm.com>
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* Based on the s390 virtio bus code:
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* Copyright (c) 2009 Alexander Graf <agraf@suse.de>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include "hw/hw.h"
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#include "sysemu/sysemu.h"
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#include "hw/boards.h"
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#include "monitor/monitor.h"
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#include "hw/loader.h"
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#include "elf.h"
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#include "hw/sysbus.h"
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#include "sysemu/kvm.h"
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#include "sysemu/device_tree.h"
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#include "kvm_ppc.h"
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#include "hw/ppc/spapr.h"
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#include "hw/ppc/spapr_vio.h"
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#include "hw/ppc/xics.h"
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#include <libfdt.h>
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/* #define DEBUG_SPAPR */
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#ifdef DEBUG_SPAPR
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#define dprintf(fmt, ...) \
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do { fprintf(stderr, fmt, ## __VA_ARGS__); } while (0)
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#else
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#define dprintf(fmt, ...) \
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do { } while (0)
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#endif
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static Property spapr_vio_props[] = {
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DEFINE_PROP_UINT32("irq", VIOsPAPRDevice, irq, 0), \
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DEFINE_PROP_END_OF_LIST(),
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};
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static char *spapr_vio_get_dev_name(DeviceState *qdev)
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{
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VIOsPAPRDevice *dev = VIO_SPAPR_DEVICE(qdev);
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VIOsPAPRDeviceClass *pc = VIO_SPAPR_DEVICE_GET_CLASS(dev);
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char *name;
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/* Device tree style name device@reg */
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name = g_strdup_printf("%s@%x", pc->dt_name, dev->reg);
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return name;
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}
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static void spapr_vio_bus_class_init(ObjectClass *klass, void *data)
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{
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BusClass *k = BUS_CLASS(klass);
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k->get_dev_path = spapr_vio_get_dev_name;
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}
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static const TypeInfo spapr_vio_bus_info = {
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.name = TYPE_SPAPR_VIO_BUS,
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.parent = TYPE_BUS,
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.class_init = spapr_vio_bus_class_init,
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.instance_size = sizeof(VIOsPAPRBus),
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};
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VIOsPAPRDevice *spapr_vio_find_by_reg(VIOsPAPRBus *bus, uint32_t reg)
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{
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BusChild *kid;
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VIOsPAPRDevice *dev = NULL;
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QTAILQ_FOREACH(kid, &bus->bus.children, sibling) {
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dev = (VIOsPAPRDevice *)kid->child;
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if (dev->reg == reg) {
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return dev;
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}
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}
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return NULL;
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}
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static int vio_make_devnode(VIOsPAPRDevice *dev,
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void *fdt)
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{
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VIOsPAPRDeviceClass *pc = VIO_SPAPR_DEVICE_GET_CLASS(dev);
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int vdevice_off, node_off, ret;
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char *dt_name;
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vdevice_off = fdt_path_offset(fdt, "/vdevice");
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if (vdevice_off < 0) {
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return vdevice_off;
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}
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dt_name = spapr_vio_get_dev_name(DEVICE(dev));
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node_off = fdt_add_subnode(fdt, vdevice_off, dt_name);
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g_free(dt_name);
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if (node_off < 0) {
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return node_off;
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}
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ret = fdt_setprop_cell(fdt, node_off, "reg", dev->reg);
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if (ret < 0) {
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return ret;
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}
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if (pc->dt_type) {
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ret = fdt_setprop_string(fdt, node_off, "device_type",
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pc->dt_type);
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if (ret < 0) {
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return ret;
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}
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}
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if (pc->dt_compatible) {
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ret = fdt_setprop_string(fdt, node_off, "compatible",
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pc->dt_compatible);
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if (ret < 0) {
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return ret;
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}
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}
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if (dev->irq) {
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uint32_t ints_prop[] = {cpu_to_be32(dev->irq), 0};
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ret = fdt_setprop(fdt, node_off, "interrupts", ints_prop,
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sizeof(ints_prop));
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if (ret < 0) {
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return ret;
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}
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}
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ret = spapr_tcet_dma_dt(fdt, node_off, "ibm,my-dma-window", dev->tcet);
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if (ret < 0) {
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return ret;
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}
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if (pc->devnode) {
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ret = (pc->devnode)(dev, fdt, node_off);
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if (ret < 0) {
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return ret;
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}
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}
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return node_off;
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}
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/*
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* CRQ handling
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*/
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static target_ulong h_reg_crq(PowerPCCPU *cpu, sPAPREnvironment *spapr,
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target_ulong opcode, target_ulong *args)
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{
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target_ulong reg = args[0];
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target_ulong queue_addr = args[1];
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target_ulong queue_len = args[2];
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VIOsPAPRDevice *dev = spapr_vio_find_by_reg(spapr->vio_bus, reg);
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if (!dev) {
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hcall_dprintf("Unit 0x" TARGET_FMT_lx " does not exist\n", reg);
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return H_PARAMETER;
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}
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/* We can't grok a queue size bigger than 256M for now */
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if (queue_len < 0x1000 || queue_len > 0x10000000) {
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hcall_dprintf("Queue size too small or too big (0x" TARGET_FMT_lx
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")\n", queue_len);
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return H_PARAMETER;
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}
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/* Check queue alignment */
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if (queue_addr & 0xfff) {
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hcall_dprintf("Queue not aligned (0x" TARGET_FMT_lx ")\n", queue_addr);
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return H_PARAMETER;
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}
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/* Check if device supports CRQs */
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if (!dev->crq.SendFunc) {
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hcall_dprintf("Device does not support CRQ\n");
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return H_NOT_FOUND;
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}
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/* Already a queue ? */
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if (dev->crq.qsize) {
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hcall_dprintf("CRQ already registered\n");
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return H_RESOURCE;
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}
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dev->crq.qladdr = queue_addr;
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dev->crq.qsize = queue_len;
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dev->crq.qnext = 0;
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dprintf("CRQ for dev 0x" TARGET_FMT_lx " registered at 0x"
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TARGET_FMT_lx "/0x" TARGET_FMT_lx "\n",
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reg, queue_addr, queue_len);
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return H_SUCCESS;
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}
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static target_ulong free_crq(VIOsPAPRDevice *dev)
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{
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dev->crq.qladdr = 0;
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dev->crq.qsize = 0;
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dev->crq.qnext = 0;
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dprintf("CRQ for dev 0x%" PRIx32 " freed\n", dev->reg);
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return H_SUCCESS;
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}
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static target_ulong h_free_crq(PowerPCCPU *cpu, sPAPREnvironment *spapr,
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target_ulong opcode, target_ulong *args)
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{
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target_ulong reg = args[0];
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VIOsPAPRDevice *dev = spapr_vio_find_by_reg(spapr->vio_bus, reg);
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if (!dev) {
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hcall_dprintf("Unit 0x" TARGET_FMT_lx " does not exist\n", reg);
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return H_PARAMETER;
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}
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return free_crq(dev);
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}
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static target_ulong h_send_crq(PowerPCCPU *cpu, sPAPREnvironment *spapr,
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target_ulong opcode, target_ulong *args)
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{
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target_ulong reg = args[0];
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target_ulong msg_hi = args[1];
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target_ulong msg_lo = args[2];
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VIOsPAPRDevice *dev = spapr_vio_find_by_reg(spapr->vio_bus, reg);
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uint64_t crq_mangle[2];
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if (!dev) {
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hcall_dprintf("Unit 0x" TARGET_FMT_lx " does not exist\n", reg);
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return H_PARAMETER;
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}
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crq_mangle[0] = cpu_to_be64(msg_hi);
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crq_mangle[1] = cpu_to_be64(msg_lo);
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if (dev->crq.SendFunc) {
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return dev->crq.SendFunc(dev, (uint8_t *)crq_mangle);
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}
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return H_HARDWARE;
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}
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static target_ulong h_enable_crq(PowerPCCPU *cpu, sPAPREnvironment *spapr,
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target_ulong opcode, target_ulong *args)
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{
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target_ulong reg = args[0];
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VIOsPAPRDevice *dev = spapr_vio_find_by_reg(spapr->vio_bus, reg);
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if (!dev) {
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hcall_dprintf("Unit 0x" TARGET_FMT_lx " does not exist\n", reg);
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return H_PARAMETER;
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}
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return 0;
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}
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/* Returns negative error, 0 success, or positive: queue full */
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int spapr_vio_send_crq(VIOsPAPRDevice *dev, uint8_t *crq)
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{
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int rc;
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uint8_t byte;
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if (!dev->crq.qsize) {
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fprintf(stderr, "spapr_vio_send_creq on uninitialized queue\n");
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return -1;
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}
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/* Maybe do a fast path for KVM just writing to the pages */
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rc = spapr_vio_dma_read(dev, dev->crq.qladdr + dev->crq.qnext, &byte, 1);
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if (rc) {
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return rc;
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}
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if (byte != 0) {
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return 1;
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}
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rc = spapr_vio_dma_write(dev, dev->crq.qladdr + dev->crq.qnext + 8,
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&crq[8], 8);
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if (rc) {
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return rc;
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}
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kvmppc_eieio();
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rc = spapr_vio_dma_write(dev, dev->crq.qladdr + dev->crq.qnext, crq, 8);
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if (rc) {
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return rc;
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}
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dev->crq.qnext = (dev->crq.qnext + 16) % dev->crq.qsize;
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if (dev->signal_state & 1) {
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qemu_irq_pulse(spapr_vio_qirq(dev));
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}
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return 0;
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}
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/* "quiesce" handling */
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static void spapr_vio_quiesce_one(VIOsPAPRDevice *dev)
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{
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if (dev->tcet) {
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spapr_tce_reset(dev->tcet);
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}
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free_crq(dev);
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}
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static void rtas_set_tce_bypass(PowerPCCPU *cpu, sPAPREnvironment *spapr,
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uint32_t token,
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uint32_t nargs, target_ulong args,
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uint32_t nret, target_ulong rets)
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{
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VIOsPAPRBus *bus = spapr->vio_bus;
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VIOsPAPRDevice *dev;
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uint32_t unit, enable;
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if (nargs != 2) {
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rtas_st(rets, 0, -3);
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return;
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}
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unit = rtas_ld(args, 0);
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enable = rtas_ld(args, 1);
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dev = spapr_vio_find_by_reg(bus, unit);
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if (!dev) {
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rtas_st(rets, 0, -3);
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return;
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}
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if (!dev->tcet) {
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rtas_st(rets, 0, -3);
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return;
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}
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spapr_tce_set_bypass(dev->tcet, !!enable);
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rtas_st(rets, 0, 0);
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}
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static void rtas_quiesce(PowerPCCPU *cpu, sPAPREnvironment *spapr,
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uint32_t token,
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uint32_t nargs, target_ulong args,
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uint32_t nret, target_ulong rets)
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{
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VIOsPAPRBus *bus = spapr->vio_bus;
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BusChild *kid;
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VIOsPAPRDevice *dev = NULL;
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if (nargs != 0) {
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rtas_st(rets, 0, -3);
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return;
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}
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QTAILQ_FOREACH(kid, &bus->bus.children, sibling) {
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dev = (VIOsPAPRDevice *)kid->child;
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spapr_vio_quiesce_one(dev);
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}
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rtas_st(rets, 0, 0);
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}
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static VIOsPAPRDevice *reg_conflict(VIOsPAPRDevice *dev)
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{
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VIOsPAPRBus *bus = DO_UPCAST(VIOsPAPRBus, bus, dev->qdev.parent_bus);
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BusChild *kid;
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VIOsPAPRDevice *other;
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/*
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* Check for a device other than the given one which is already
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* using the requested address. We have to open code this because
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* the given dev might already be in the list.
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*/
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QTAILQ_FOREACH(kid, &bus->bus.children, sibling) {
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other = VIO_SPAPR_DEVICE(kid->child);
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if (other != dev && other->reg == dev->reg) {
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return other;
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}
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}
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return 0;
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}
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static void spapr_vio_busdev_reset(DeviceState *qdev)
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{
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VIOsPAPRDevice *dev = VIO_SPAPR_DEVICE(qdev);
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VIOsPAPRDeviceClass *pc = VIO_SPAPR_DEVICE_GET_CLASS(dev);
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/* Shut down the request queue and TCEs if necessary */
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spapr_vio_quiesce_one(dev);
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dev->signal_state = 0;
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if (pc->reset) {
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pc->reset(dev);
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}
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}
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static int spapr_vio_busdev_init(DeviceState *qdev)
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{
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VIOsPAPRDevice *dev = (VIOsPAPRDevice *)qdev;
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VIOsPAPRDeviceClass *pc = VIO_SPAPR_DEVICE_GET_CLASS(dev);
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char *id;
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if (dev->reg != -1) {
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/*
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* Explicitly assigned address, just verify that no-one else
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* is using it. other mechanism). We have to open code this
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* rather than using spapr_vio_find_by_reg() because sdev
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* itself is already in the list.
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*/
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VIOsPAPRDevice *other = reg_conflict(dev);
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if (other) {
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fprintf(stderr, "vio: %s and %s devices conflict at address %#x\n",
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object_get_typename(OBJECT(qdev)),
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object_get_typename(OBJECT(&other->qdev)),
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dev->reg);
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return -1;
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}
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} else {
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/* Need to assign an address */
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VIOsPAPRBus *bus = DO_UPCAST(VIOsPAPRBus, bus, dev->qdev.parent_bus);
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do {
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dev->reg = bus->next_reg++;
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} while (reg_conflict(dev));
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}
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/* Don't overwrite ids assigned on the command line */
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if (!dev->qdev.id) {
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id = spapr_vio_get_dev_name(DEVICE(dev));
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dev->qdev.id = id;
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}
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dev->irq = spapr_allocate_msi(dev->irq);
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if (!dev->irq) {
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return -1;
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}
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if (pc->rtce_window_size) {
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uint32_t liobn = SPAPR_VIO_BASE_LIOBN | dev->reg;
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dev->tcet = spapr_tce_new_table(liobn, pc->rtce_window_size);
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address_space_init(&dev->as, spapr_tce_get_iommu(dev->tcet), qdev->id);
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}
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return pc->init(dev);
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}
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static target_ulong h_vio_signal(PowerPCCPU *cpu, sPAPREnvironment *spapr,
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target_ulong opcode,
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target_ulong *args)
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{
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target_ulong reg = args[0];
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target_ulong mode = args[1];
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VIOsPAPRDevice *dev = spapr_vio_find_by_reg(spapr->vio_bus, reg);
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VIOsPAPRDeviceClass *pc;
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if (!dev) {
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return H_PARAMETER;
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}
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pc = VIO_SPAPR_DEVICE_GET_CLASS(dev);
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if (mode & ~pc->signal_mask) {
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return H_PARAMETER;
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}
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dev->signal_state = mode;
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return H_SUCCESS;
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}
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VIOsPAPRBus *spapr_vio_bus_init(void)
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{
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VIOsPAPRBus *bus;
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BusState *qbus;
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DeviceState *dev;
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/* Create bridge device */
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dev = qdev_create(NULL, "spapr-vio-bridge");
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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)
|
|
|
|
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 = 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;
|
|
}
|