Archipelago » qemu

/*

 * 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.h"

#include "sysemu.h"

#include "boards.h"

#include "monitor.h"

#include "loader.h"

#include "elf.h"

#include "hw/sysbus.h"

#include "kvm.h"

#include "device_tree.h"

#include "kvm_ppc.h"

#include "hw/spapr.h"

#include "hw/spapr_vio.h"

#ifdef CONFIG_FDT

#include <libfdt.h>

#endif /* CONFIG_FDT */

/* #define DEBUG_SPAPR */

/* #define DEBUG_TCE */

#ifdef DEBUG_SPAPR

#define dprintf(fmt, ...) \

    do { fprintf(stderr, fmt, ## __VA_ARGS__); } while (0)

#else

#define dprintf(fmt, ...) \

    do { } while (0)

#endif

static struct BusInfo spapr_vio_bus_info = {

    .name       = "spapr-vio",

    .size       = sizeof(VIOsPAPRBus),

};

VIOsPAPRDevice *spapr_vio_find_by_reg(VIOsPAPRBus *bus, uint32_t reg)

{

    DeviceState *qdev;

    VIOsPAPRDevice *dev = NULL;

    QLIST_FOREACH(qdev, &bus->bus.children, sibling) {

        dev = (VIOsPAPRDevice *)qdev;

        if (dev->reg == reg) {

            break;

        }

    }

    return dev;

}

#ifdef CONFIG_FDT

static int vio_make_devnode(VIOsPAPRDevice *dev,

                            void *fdt)

{

    VIOsPAPRDeviceInfo *info = (VIOsPAPRDeviceInfo *)dev->qdev.info;

    int vdevice_off, node_off;

    int ret;

    vdevice_off = fdt_path_offset(fdt, "/vdevice");

    if (vdevice_off < 0) {

        return vdevice_off;

    }

    node_off = fdt_add_subnode(fdt, vdevice_off, dev->qdev.id);

    if (node_off < 0) {

        return node_off;

    }

    ret = fdt_setprop_cell(fdt, node_off, "reg", dev->reg);

    if (ret < 0) {

        return ret;

    }

    if (info->dt_type) {

        ret = fdt_setprop_string(fdt, node_off, "device_type",

                                 info->dt_type);

        if (ret < 0) {

            return ret;

        }

    }

    if (info->dt_compatible) {

        ret = fdt_setprop_string(fdt, node_off, "compatible",

                                 info->dt_compatible);

        if (ret < 0) {

            return ret;

        }

    }

    if (dev->qirq) {

        uint32_t ints_prop[] = {cpu_to_be32(dev->vio_irq_num), 0};

        ret = fdt_setprop(fdt, node_off, "interrupts", ints_prop,

                          sizeof(ints_prop));

        if (ret < 0) {

            return ret;

        }

    }

    if (dev->rtce_window_size) {

        uint32_t dma_prop[] = {cpu_to_be32(dev->reg),

                               0, 0,

                               0, cpu_to_be32(dev->rtce_window_size)};

        ret = fdt_setprop_cell(fdt, node_off, "ibm,#dma-address-cells", 2);

        if (ret < 0) {

            return ret;

        }

        ret = fdt_setprop_cell(fdt, node_off, "ibm,#dma-size-cells", 2);

        if (ret < 0) {

            return ret;

        }

        ret = fdt_setprop(fdt, node_off, "ibm,my-dma-window", dma_prop,

                          sizeof(dma_prop));

        if (ret < 0) {

            return ret;

        }

    }

    if (info->devnode) {

        ret = (info->devnode)(dev, fdt, node_off);

        if (ret < 0) {

            return ret;

        }

    }

    return node_off;

}

#endif /* CONFIG_FDT */

/*

 * RTCE handling

 */

static void rtce_init(VIOsPAPRDevice *dev)

{

    size_t size = (dev->rtce_window_size >> SPAPR_VIO_TCE_PAGE_SHIFT)

        * sizeof(VIOsPAPR_RTCE);

    if (size) {

        dev->rtce_table = qemu_mallocz(size);

    }

}

static target_ulong h_put_tce(CPUState *env, sPAPREnvironment *spapr,

                              target_ulong opcode, target_ulong *args)

{

    target_ulong liobn = args[0];

    target_ulong ioba = args[1];

    target_ulong tce = args[2];

    VIOsPAPRDevice *dev = spapr_vio_find_by_reg(spapr->vio_bus, liobn);

    VIOsPAPR_RTCE *rtce;

    if (!dev) {

        hcall_dprintf("spapr_vio_put_tce on non-existent LIOBN "

                      TARGET_FMT_lx "\n", liobn);

        return H_PARAMETER;

    }

    ioba &= ~(SPAPR_VIO_TCE_PAGE_SIZE - 1);

#ifdef DEBUG_TCE

    fprintf(stderr, "spapr_vio_put_tce on %s  ioba 0x" TARGET_FMT_lx

            "  TCE 0x" TARGET_FMT_lx "\n", dev->qdev.id, ioba, tce);

#endif

    if (ioba >= dev->rtce_window_size) {

        hcall_dprintf("spapr_vio_put_tce on out-of-boards IOBA 0x"

                      TARGET_FMT_lx "\n", ioba);

        return H_PARAMETER;

    }

    rtce = dev->rtce_table + (ioba >> SPAPR_VIO_TCE_PAGE_SHIFT);

    rtce->tce = tce;

    return H_SUCCESS;

}

int spapr_vio_check_tces(VIOsPAPRDevice *dev, target_ulong ioba,

                         target_ulong len, enum VIOsPAPR_TCEAccess access)

{

    int start, end, i;

    start = ioba >> SPAPR_VIO_TCE_PAGE_SHIFT;

    end = (ioba + len - 1) >> SPAPR_VIO_TCE_PAGE_SHIFT;

    for (i = start; i <= end; i++) {

        if ((dev->rtce_table[i].tce & access) != access) {

#ifdef DEBUG_TCE

            fprintf(stderr, "FAIL on %d\n", i);

#endif

            return -1;

        }

    }

    return 0;

}

int spapr_tce_dma_write(VIOsPAPRDevice *dev, uint64_t taddr, const void *buf,

                        uint32_t size)

{

#ifdef DEBUG_TCE

    fprintf(stderr, "spapr_tce_dma_write taddr=0x%llx size=0x%x\n",

            (unsigned long long)taddr, size);

#endif

    /* Check for bypass */

    if (dev->flags & VIO_PAPR_FLAG_DMA_BYPASS) {

        cpu_physical_memory_write(taddr, buf, size);

        return 0;

    }

    while (size) {

        uint64_t tce;

        uint32_t lsize;

        uint64_t txaddr;

        /* Check if we are in bound */

        if (taddr >= dev->rtce_window_size) {

#ifdef DEBUG_TCE

            fprintf(stderr, "spapr_tce_dma_write out of bounds\n");

#endif

            return H_DEST_PARM;

        }

        tce = dev->rtce_table[taddr >> SPAPR_VIO_TCE_PAGE_SHIFT].tce;

        /* How much til end of page ? */

        lsize = MIN(size, ((~taddr) & SPAPR_VIO_TCE_PAGE_MASK) + 1);

        /* Check TCE */

        if (!(tce & 2)) {

            return H_DEST_PARM;

        }

        /* Translate */

        txaddr = (tce & ~SPAPR_VIO_TCE_PAGE_MASK) |

            (taddr & SPAPR_VIO_TCE_PAGE_MASK);

#ifdef DEBUG_TCE

        fprintf(stderr, " -> write to txaddr=0x%llx, size=0x%x\n",

                (unsigned long long)txaddr, lsize);

#endif

        /* Do it */

        cpu_physical_memory_write(txaddr, buf, lsize);

        buf += lsize;

        taddr += lsize;

        size -= lsize;

    }

    return 0;

}

int spapr_tce_dma_zero(VIOsPAPRDevice *dev, uint64_t taddr, uint32_t size)

{

    /* FIXME: allocating a temp buffer is nasty, but just stepping

     * through writing zeroes is awkward.  This will do for now. */

    uint8_t zeroes[size];

#ifdef DEBUG_TCE

    fprintf(stderr, "spapr_tce_dma_zero taddr=0x%llx size=0x%x\n",

            (unsigned long long)taddr, size);

#endif

    memset(zeroes, 0, size);

    return spapr_tce_dma_write(dev, taddr, zeroes, size);

}

void stb_tce(VIOsPAPRDevice *dev, uint64_t taddr, uint8_t val)

{

    spapr_tce_dma_write(dev, taddr, &val, sizeof(val));

}

void sth_tce(VIOsPAPRDevice *dev, uint64_t taddr, uint16_t val)

{

    val = tswap16(val);

    spapr_tce_dma_write(dev, taddr, &val, sizeof(val));

}

void stw_tce(VIOsPAPRDevice *dev, uint64_t taddr, uint32_t val)

{

    val = tswap32(val);

    spapr_tce_dma_write(dev, taddr, &val, sizeof(val));

}

void stq_tce(VIOsPAPRDevice *dev, uint64_t taddr, uint64_t val)

{

    val = tswap64(val);

    spapr_tce_dma_write(dev, taddr, &val, sizeof(val));

}

int spapr_tce_dma_read(VIOsPAPRDevice *dev, uint64_t taddr, void *buf,

                       uint32_t size)

{

#ifdef DEBUG_TCE

    fprintf(stderr, "spapr_tce_dma_write taddr=0x%llx size=0x%x\n",

            (unsigned long long)taddr, size);

#endif

    /* Check for bypass */

    if (dev->flags & VIO_PAPR_FLAG_DMA_BYPASS) {

        cpu_physical_memory_read(taddr, buf, size);

        return 0;

    }

    while (size) {

        uint64_t tce;

        uint32_t lsize;

        uint64_t txaddr;

        /* Check if we are in bound */

        if (taddr >= dev->rtce_window_size) {

#ifdef DEBUG_TCE

            fprintf(stderr, "spapr_tce_dma_read out of bounds\n");

#endif

            return H_DEST_PARM;

        }

        tce = dev->rtce_table[taddr >> SPAPR_VIO_TCE_PAGE_SHIFT].tce;

        /* How much til end of page ? */

        lsize = MIN(size, ((~taddr) & SPAPR_VIO_TCE_PAGE_MASK) + 1);

        /* Check TCE */

        if (!(tce & 1)) {

            return H_DEST_PARM;

        }

        /* Translate */

        txaddr = (tce & ~SPAPR_VIO_TCE_PAGE_MASK) |

            (taddr & SPAPR_VIO_TCE_PAGE_MASK);

#ifdef DEBUG_TCE

        fprintf(stderr, " -> write to txaddr=0x%llx, size=0x%x\n",

                (unsigned long long)txaddr, lsize);

#endif

        /* Do it */

        cpu_physical_memory_read(txaddr, buf, lsize);

        buf += lsize;

        taddr += lsize;

        size -= lsize;

    }

    return H_SUCCESS;

}

uint64_t ldq_tce(VIOsPAPRDevice *dev, uint64_t taddr)

{

    uint64_t val;

    spapr_tce_dma_read(dev, taddr, &val, sizeof(val));

    return tswap64(val);

}

/*

 * CRQ handling

 */

static target_ulong h_reg_crq(CPUState *env, 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("h_reg_crq on non-existent unit 0x"

                      TARGET_FMT_lx "\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("h_reg_crq, queue size too small or too big (0x%llx)\n",

                      (unsigned long long)queue_len);

        return H_PARAMETER;

    }

    /* Check queue alignment */

    if (queue_addr & 0xfff) {

        hcall_dprintf("h_reg_crq, queue not aligned (0x%llx)\n",

                      (unsigned long long)queue_addr);

        return H_PARAMETER;

    }

    /* Check if device supports CRQs */

    if (!dev->crq.SendFunc) {

        return H_NOT_FOUND;

    }

    /* Already a queue ? */

    if (dev->crq.qsize) {

        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 h_free_crq(CPUState *env, 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("h_free_crq on non-existent unit 0x"

                      TARGET_FMT_lx "\n", reg);

        return H_PARAMETER;

    }

    dev->crq.qladdr = 0;

    dev->crq.qsize = 0;

    dev->crq.qnext = 0;

    dprintf("CRQ for dev 0x" TARGET_FMT_lx " freed\n", reg);

    return H_SUCCESS;

}

static target_ulong h_send_crq(CPUState *env, 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("h_send_crq on non-existent unit 0x"

                      TARGET_FMT_lx "\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(CPUState *env, 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("h_enable_crq on non-existent unit 0x"

                      TARGET_FMT_lx "\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_tce_dma_read(dev, dev->crq.qladdr + dev->crq.qnext, &byte, 1);

    if (rc) {

        return rc;

    }

    if (byte != 0) {

        return 1;

    }

    rc = spapr_tce_dma_write(dev, dev->crq.qladdr + dev->crq.qnext + 8,

                             &crq[8], 8);

    if (rc) {

        return rc;

    }

    kvmppc_eieio();

    rc = spapr_tce_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(dev->qirq);

    }

    return 0;

}

/* "quiesce" handling */

static void spapr_vio_quiesce_one(VIOsPAPRDevice *dev)

{

    dev->flags &= ~VIO_PAPR_FLAG_DMA_BYPASS;

    if (dev->rtce_table) {

        size_t size = (dev->rtce_window_size >> SPAPR_VIO_TCE_PAGE_SHIFT)

            * sizeof(VIOsPAPR_RTCE);

        memset(dev->rtce_table, 0, size);

    }

    dev->crq.qladdr = 0;

    dev->crq.qsize = 0;

    dev->crq.qnext = 0;

}

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 (enable) {

        dev->flags |= VIO_PAPR_FLAG_DMA_BYPASS;

    } else {

        dev->flags &= ~VIO_PAPR_FLAG_DMA_BYPASS;

    }

    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;

    DeviceState *qdev;

    VIOsPAPRDevice *dev = NULL;

    if (nargs != 0) {

        rtas_st(rets, 0, -3);

        return;

    }

    QLIST_FOREACH(qdev, &bus->bus.children, sibling) {

        dev = (VIOsPAPRDevice *)qdev;

        spapr_vio_quiesce_one(dev);

    }

    rtas_st(rets, 0, 0);

}

static int spapr_vio_busdev_init(DeviceState *qdev, DeviceInfo *qinfo)

{

    VIOsPAPRDeviceInfo *info = (VIOsPAPRDeviceInfo *)qinfo;

    VIOsPAPRDevice *dev = (VIOsPAPRDevice *)qdev;

    char *id;

    if (asprintf(&id, "%s@%x", info->dt_name, dev->reg) < 0) {

        return -1;

    }

    dev->qdev.id = id;

    rtce_init(dev);

    return info->init(dev);

}

void spapr_vio_bus_register_withprop(VIOsPAPRDeviceInfo *info)

{

    info->qdev.init = spapr_vio_busdev_init;

    info->qdev.bus_info = &spapr_vio_bus_info;

    assert(info->qdev.size >= sizeof(VIOsPAPRDevice));

    qdev_register(&info->qdev);

}

static target_ulong h_vio_signal(CPUState *env, 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);

    VIOsPAPRDeviceInfo *info;

    if (!dev) {

        return H_PARAMETER;

    }

    info = (VIOsPAPRDeviceInfo *)dev->qdev.info;

    if (mode & ~info->signal_mask) {

        return H_PARAMETER;

    }

    dev->signal_state = mode;

    return H_SUCCESS;

}

VIOsPAPRBus *spapr_vio_bus_init(void)

{

    VIOsPAPRBus *bus;

    BusState *qbus;

    DeviceState *dev;

    DeviceInfo *qinfo;

    /* Create bridge device */

    dev = qdev_create(NULL, "spapr-vio-bridge");

    qdev_init_nofail(dev);

    /* Create bus on bridge device */

    qbus = qbus_create(&spapr_vio_bus_info, dev, "spapr-vio");

    bus = DO_UPCAST(VIOsPAPRBus, bus, qbus);

    /* hcall-vio */

    spapr_register_hypercall(H_VIO_SIGNAL, h_vio_signal);

    /* hcall-tce */

    spapr_register_hypercall(H_PUT_TCE, h_put_tce);

    /* 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);

    for (qinfo = device_info_list; qinfo; qinfo = qinfo->next) {

        VIOsPAPRDeviceInfo *info = (VIOsPAPRDeviceInfo *)qinfo;

        if (qinfo->bus_info != &spapr_vio_bus_info) {

            continue;

        }

        if (info->hcalls) {

            info->hcalls(bus);

        }

    }

    return bus;

}

/* Represents sPAPR hcall VIO devices */

static int spapr_vio_bridge_init(SysBusDevice *dev)

{

    /* nothing */

    return 0;

}

static SysBusDeviceInfo spapr_vio_bridge_info = {

    .init = spapr_vio_bridge_init,

    .qdev.name  = "spapr-vio-bridge",

    .qdev.size  = sizeof(SysBusDevice),

    .qdev.no_user = 1,

};

static void spapr_vio_register_devices(void)

{

    sysbus_register_withprop(&spapr_vio_bridge_info);

}

device_init(spapr_vio_register_devices)

#ifdef CONFIG_FDT

int spapr_populate_vdevice(VIOsPAPRBus *bus, void *fdt)

{

    DeviceState *qdev;

    int ret = 0;

    QLIST_FOREACH(qdev, &bus->bus.children, sibling) {

        VIOsPAPRDevice *dev = (VIOsPAPRDevice *)qdev;

        ret = vio_make_devnode(dev, fdt);

        if (ret < 0) {

            return ret;

        }

    }

    return 0;

}

#endif /* CONFIG_FDT */