root / hw / spapr_vio.c @ b13ce26d
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/*
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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.h" |
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#include "sysemu.h" |
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#include "boards.h" |
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#include "monitor.h" |
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#include "loader.h" |
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#include "elf.h" |
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#include "hw/sysbus.h" |
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#include "kvm.h" |
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#include "device_tree.h" |
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#include "kvm_ppc.h" |
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#include "hw/spapr.h" |
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#include "hw/spapr_vio.h" |
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#include "hw/xics.h" |
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#ifdef CONFIG_FDT
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#include <libfdt.h> |
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#endif /* CONFIG_FDT */ |
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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 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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.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 char *vio_format_dev_name(VIOsPAPRDevice *dev) |
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{ |
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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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if (asprintf(&name, "%s@%x", pc->dt_name, dev->reg) < 0) { |
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return NULL; |
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} |
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return name;
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} |
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#ifdef CONFIG_FDT
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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 = vio_format_dev_name(dev); |
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if (!dt_name) {
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return -ENOMEM;
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} |
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node_off = fdt_add_subnode(fdt, vdevice_off, dt_name); |
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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->dma);
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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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#endif /* CONFIG_FDT */ |
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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->dma) {
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spapr_tce_reset(dev->dma); |
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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(sPAPREnvironment *spapr, 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); |
340 |
if (!dev) {
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rtas_st(rets, 0, -3); |
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return;
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} |
344 |
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if (!dev->dma) {
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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->dma, !!enable); |
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rtas_st(rets, 0, 0); |
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} |
354 |
|
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static void rtas_quiesce(sPAPREnvironment *spapr, 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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|
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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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} |
367 |
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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); |
371 |
} |
372 |
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rtas_st(rets, 0, 0); |
374 |
} |
375 |
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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); |
379 |
BusChild *kid; |
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VIOsPAPRDevice *other; |
381 |
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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) { |
388 |
other = DO_UPCAST(VIOsPAPRDevice, qdev, kid->child); |
389 |
|
390 |
if (other != dev && other->reg == dev->reg) {
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return other;
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} |
393 |
} |
394 |
|
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return 0; |
396 |
} |
397 |
|
398 |
static void spapr_vio_busdev_reset(DeviceState *qdev) |
399 |
{ |
400 |
VIOsPAPRDevice *dev = DO_UPCAST(VIOsPAPRDevice, qdev, qdev); |
401 |
VIOsPAPRDeviceClass *pc = VIO_SPAPR_DEVICE_GET_CLASS(dev); |
402 |
|
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/* Shut down the request queue and TCEs if necessary */
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spapr_vio_quiesce_one(dev); |
405 |
|
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dev->signal_state = 0;
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407 |
|
408 |
if (pc->reset) {
|
409 |
pc->reset(dev); |
410 |
} |
411 |
} |
412 |
|
413 |
static int spapr_vio_busdev_init(DeviceState *qdev) |
414 |
{ |
415 |
VIOsPAPRDevice *dev = (VIOsPAPRDevice *)qdev; |
416 |
VIOsPAPRDeviceClass *pc = VIO_SPAPR_DEVICE_GET_CLASS(dev); |
417 |
char *id;
|
418 |
|
419 |
if (dev->reg != -1) { |
420 |
/*
|
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* Explicitly assigned address, just verify that no-one else
|
422 |
* is using it. other mechanism). We have to open code this
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423 |
* rather than using spapr_vio_find_by_reg() because sdev
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424 |
* itself is already in the list.
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*/
|
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VIOsPAPRDevice *other = reg_conflict(dev); |
427 |
|
428 |
if (other) {
|
429 |
fprintf(stderr, "vio: %s and %s devices conflict at address %#x\n",
|
430 |
object_get_typename(OBJECT(qdev)), |
431 |
object_get_typename(OBJECT(&other->qdev)), |
432 |
dev->reg); |
433 |
return -1; |
434 |
} |
435 |
} else {
|
436 |
/* Need to assign an address */
|
437 |
VIOsPAPRBus *bus = DO_UPCAST(VIOsPAPRBus, bus, dev->qdev.parent_bus); |
438 |
|
439 |
do {
|
440 |
dev->reg = bus->next_reg++; |
441 |
} while (reg_conflict(dev));
|
442 |
} |
443 |
|
444 |
/* Don't overwrite ids assigned on the command line */
|
445 |
if (!dev->qdev.id) {
|
446 |
id = vio_format_dev_name(dev); |
447 |
if (!id) {
|
448 |
return -1; |
449 |
} |
450 |
dev->qdev.id = id; |
451 |
} |
452 |
|
453 |
dev->irq = spapr_allocate_msi(dev->irq); |
454 |
if (!dev->irq) {
|
455 |
return -1; |
456 |
} |
457 |
|
458 |
if (pc->rtce_window_size) {
|
459 |
uint32_t liobn = SPAPR_VIO_BASE_LIOBN | dev->reg; |
460 |
dev->dma = spapr_tce_new_dma_context(liobn, pc->rtce_window_size); |
461 |
} |
462 |
|
463 |
return pc->init(dev);
|
464 |
} |
465 |
|
466 |
static target_ulong h_vio_signal(PowerPCCPU *cpu, sPAPREnvironment *spapr,
|
467 |
target_ulong opcode, |
468 |
target_ulong *args) |
469 |
{ |
470 |
target_ulong reg = args[0];
|
471 |
target_ulong mode = args[1];
|
472 |
VIOsPAPRDevice *dev = spapr_vio_find_by_reg(spapr->vio_bus, reg); |
473 |
VIOsPAPRDeviceClass *pc; |
474 |
|
475 |
if (!dev) {
|
476 |
return H_PARAMETER;
|
477 |
} |
478 |
|
479 |
pc = VIO_SPAPR_DEVICE_GET_CLASS(dev); |
480 |
|
481 |
if (mode & ~pc->signal_mask) {
|
482 |
return H_PARAMETER;
|
483 |
} |
484 |
|
485 |
dev->signal_state = mode; |
486 |
|
487 |
return H_SUCCESS;
|
488 |
} |
489 |
|
490 |
VIOsPAPRBus *spapr_vio_bus_init(void)
|
491 |
{ |
492 |
VIOsPAPRBus *bus; |
493 |
BusState *qbus; |
494 |
DeviceState *dev; |
495 |
|
496 |
/* Create bridge device */
|
497 |
dev = qdev_create(NULL, "spapr-vio-bridge"); |
498 |
qdev_init_nofail(dev); |
499 |
|
500 |
/* Create bus on bridge device */
|
501 |
|
502 |
qbus = qbus_create(TYPE_SPAPR_VIO_BUS, dev, "spapr-vio");
|
503 |
bus = DO_UPCAST(VIOsPAPRBus, bus, qbus); |
504 |
bus->next_reg = 0x1000;
|
505 |
|
506 |
/* hcall-vio */
|
507 |
spapr_register_hypercall(H_VIO_SIGNAL, h_vio_signal); |
508 |
|
509 |
/* hcall-crq */
|
510 |
spapr_register_hypercall(H_REG_CRQ, h_reg_crq); |
511 |
spapr_register_hypercall(H_FREE_CRQ, h_free_crq); |
512 |
spapr_register_hypercall(H_SEND_CRQ, h_send_crq); |
513 |
spapr_register_hypercall(H_ENABLE_CRQ, h_enable_crq); |
514 |
|
515 |
/* RTAS calls */
|
516 |
spapr_rtas_register("ibm,set-tce-bypass", rtas_set_tce_bypass);
|
517 |
spapr_rtas_register("quiesce", rtas_quiesce);
|
518 |
|
519 |
return bus;
|
520 |
} |
521 |
|
522 |
/* Represents sPAPR hcall VIO devices */
|
523 |
|
524 |
static int spapr_vio_bridge_init(SysBusDevice *dev) |
525 |
{ |
526 |
/* nothing */
|
527 |
return 0; |
528 |
} |
529 |
|
530 |
static void spapr_vio_bridge_class_init(ObjectClass *klass, void *data) |
531 |
{ |
532 |
DeviceClass *dc = DEVICE_CLASS(klass); |
533 |
SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass); |
534 |
|
535 |
k->init = spapr_vio_bridge_init; |
536 |
dc->no_user = 1;
|
537 |
} |
538 |
|
539 |
static TypeInfo spapr_vio_bridge_info = {
|
540 |
.name = "spapr-vio-bridge",
|
541 |
.parent = TYPE_SYS_BUS_DEVICE, |
542 |
.instance_size = sizeof(SysBusDevice),
|
543 |
.class_init = spapr_vio_bridge_class_init, |
544 |
}; |
545 |
|
546 |
static void vio_spapr_device_class_init(ObjectClass *klass, void *data) |
547 |
{ |
548 |
DeviceClass *k = DEVICE_CLASS(klass); |
549 |
k->init = spapr_vio_busdev_init; |
550 |
k->reset = spapr_vio_busdev_reset; |
551 |
k->bus_type = TYPE_SPAPR_VIO_BUS; |
552 |
k->props = spapr_vio_props; |
553 |
} |
554 |
|
555 |
static TypeInfo spapr_vio_type_info = {
|
556 |
.name = TYPE_VIO_SPAPR_DEVICE, |
557 |
.parent = TYPE_DEVICE, |
558 |
.instance_size = sizeof(VIOsPAPRDevice),
|
559 |
.abstract = true,
|
560 |
.class_size = sizeof(VIOsPAPRDeviceClass),
|
561 |
.class_init = vio_spapr_device_class_init, |
562 |
}; |
563 |
|
564 |
static void spapr_vio_register_types(void) |
565 |
{ |
566 |
type_register_static(&spapr_vio_bus_info); |
567 |
type_register_static(&spapr_vio_bridge_info); |
568 |
type_register_static(&spapr_vio_type_info); |
569 |
} |
570 |
|
571 |
type_init(spapr_vio_register_types) |
572 |
|
573 |
#ifdef CONFIG_FDT
|
574 |
static int compare_reg(const void *p1, const void *p2) |
575 |
{ |
576 |
VIOsPAPRDevice const *dev1, *dev2;
|
577 |
|
578 |
dev1 = (VIOsPAPRDevice *)*(DeviceState **)p1; |
579 |
dev2 = (VIOsPAPRDevice *)*(DeviceState **)p2; |
580 |
|
581 |
if (dev1->reg < dev2->reg) {
|
582 |
return -1; |
583 |
} |
584 |
if (dev1->reg == dev2->reg) {
|
585 |
return 0; |
586 |
} |
587 |
|
588 |
/* dev1->reg > dev2->reg */
|
589 |
return 1; |
590 |
} |
591 |
|
592 |
int spapr_populate_vdevice(VIOsPAPRBus *bus, void *fdt) |
593 |
{ |
594 |
DeviceState *qdev, **qdevs; |
595 |
BusChild *kid; |
596 |
int i, num, ret = 0; |
597 |
|
598 |
/* Count qdevs on the bus list */
|
599 |
num = 0;
|
600 |
QTAILQ_FOREACH(kid, &bus->bus.children, sibling) { |
601 |
num++; |
602 |
} |
603 |
|
604 |
/* Copy out into an array of pointers */
|
605 |
qdevs = g_malloc(sizeof(qdev) * num);
|
606 |
num = 0;
|
607 |
QTAILQ_FOREACH(kid, &bus->bus.children, sibling) { |
608 |
qdevs[num++] = kid->child; |
609 |
} |
610 |
|
611 |
/* Sort the array */
|
612 |
qsort(qdevs, num, sizeof(qdev), compare_reg);
|
613 |
|
614 |
/* Hack alert. Give the devices to libfdt in reverse order, we happen
|
615 |
* to know that will mean they are in forward order in the tree. */
|
616 |
for (i = num - 1; i >= 0; i--) { |
617 |
VIOsPAPRDevice *dev = (VIOsPAPRDevice *)(qdevs[i]); |
618 |
|
619 |
ret = vio_make_devnode(dev, fdt); |
620 |
|
621 |
if (ret < 0) { |
622 |
goto out;
|
623 |
} |
624 |
} |
625 |
|
626 |
ret = 0;
|
627 |
out:
|
628 |
free(qdevs); |
629 |
|
630 |
return ret;
|
631 |
} |
632 |
|
633 |
int spapr_populate_chosen_stdout(void *fdt, VIOsPAPRBus *bus) |
634 |
{ |
635 |
VIOsPAPRDevice *dev; |
636 |
char *name, *path;
|
637 |
int ret, offset;
|
638 |
|
639 |
dev = spapr_vty_get_default(bus); |
640 |
if (!dev)
|
641 |
return 0; |
642 |
|
643 |
offset = fdt_path_offset(fdt, "/chosen");
|
644 |
if (offset < 0) { |
645 |
return offset;
|
646 |
} |
647 |
|
648 |
name = vio_format_dev_name(dev); |
649 |
if (!name) {
|
650 |
return -ENOMEM;
|
651 |
} |
652 |
|
653 |
if (asprintf(&path, "/vdevice/%s", name) < 0) { |
654 |
path = NULL;
|
655 |
ret = -ENOMEM; |
656 |
goto out;
|
657 |
} |
658 |
|
659 |
ret = fdt_setprop_string(fdt, offset, "linux,stdout-path", path);
|
660 |
out:
|
661 |
free(name); |
662 |
free(path); |
663 |
|
664 |
return ret;
|
665 |
} |
666 |
#endif /* CONFIG_FDT */ |