Archipelago » qemu

/*

 * QEMU sPAPR IOMMU (TCE) code

 *

 * Copyright (c) 2010 David Gibson, IBM Corporation <dwg@au1.ibm.com>

 *

 * 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 "kvm.h"

#include "qdev.h"

#include "kvm_ppc.h"

#include "dma.h"

#include "hw/spapr.h"

#include <libfdt.h>

/* #define DEBUG_TCE */

enum sPAPRTCEAccess {

    SPAPR_TCE_FAULT = 0,

    SPAPR_TCE_RO = 1,

    SPAPR_TCE_WO = 2,

    SPAPR_TCE_RW = 3,

};

typedef struct sPAPRTCETable sPAPRTCETable;

struct sPAPRTCETable {

    DMAContext dma;

    uint32_t liobn;

    uint32_t window_size;

    sPAPRTCE *table;

    int fd;

    QLIST_ENTRY(sPAPRTCETable) list;

};

QLIST_HEAD(spapr_tce_tables, sPAPRTCETable) spapr_tce_tables;

static sPAPRTCETable *spapr_tce_find_by_liobn(uint32_t liobn)

{

    sPAPRTCETable *tcet;

    QLIST_FOREACH(tcet, &spapr_tce_tables, list) {

        if (tcet->liobn == liobn) {

            return tcet;

        }

    }

    return NULL;

}

static int spapr_tce_translate(DMAContext *dma,

                               dma_addr_t addr,

                               target_phys_addr_t *paddr,

                               target_phys_addr_t *len,

                               DMADirection dir)

{

    sPAPRTCETable *tcet = DO_UPCAST(sPAPRTCETable, dma, dma);

    enum sPAPRTCEAccess access = (dir == DMA_DIRECTION_FROM_DEVICE)

        ? SPAPR_TCE_WO : SPAPR_TCE_RO;

    uint64_t tce;

#ifdef DEBUG_TCE

    fprintf(stderr, "spapr_tce_translate liobn=0x%" PRIx32 " addr=0x"

            DMA_ADDR_FMT "\n", tcet->liobn, addr);

#endif

    /* Check if we are in bound */

    if (addr >= tcet->window_size) {

#ifdef DEBUG_TCE

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

#endif

        return -EFAULT;

    }

    tce = tcet->table[addr >> SPAPR_TCE_PAGE_SHIFT].tce;

    /* Check TCE */

    if (!(tce & access)) {

        return -EPERM;

    }

    /* How much til end of page ? */

    *len = ((~addr) & SPAPR_TCE_PAGE_MASK) + 1;

    /* Translate */

    *paddr = (tce & ~SPAPR_TCE_PAGE_MASK) |

        (addr & SPAPR_TCE_PAGE_MASK);

#ifdef DEBUG_TCE

    fprintf(stderr, " ->  *paddr=0x" TARGET_FMT_plx ", *len=0x"

            TARGET_FMT_plx "\n", *paddr, *len);

#endif

    return 0;

}

DMAContext *spapr_tce_new_dma_context(uint32_t liobn, size_t window_size)

{

    sPAPRTCETable *tcet;

    if (!window_size) {

        return NULL;

    }

    tcet = g_malloc0(sizeof(*tcet));

    dma_context_init(&tcet->dma, spapr_tce_translate, NULL, NULL);

    tcet->liobn = liobn;

    tcet->window_size = window_size;

    if (kvm_enabled()) {

        tcet->table = kvmppc_create_spapr_tce(liobn,

                                              window_size,

                                              &tcet->fd);

    }

    if (!tcet->table) {

        size_t table_size = (window_size >> SPAPR_TCE_PAGE_SHIFT)

            * sizeof(sPAPRTCE);

        tcet->table = g_malloc0(table_size);

    }

#ifdef DEBUG_TCE

    fprintf(stderr, "spapr_iommu: New TCE table, liobn=0x%x, context @ %p, "

            "table @ %p, fd=%d\n", liobn, &tcet->dma, tcet->table, tcet->fd);

#endif

    QLIST_INSERT_HEAD(&spapr_tce_tables, tcet, list);

    return &tcet->dma;

}

void spapr_tce_free(DMAContext *dma)

{

    if (dma) {

        sPAPRTCETable *tcet = DO_UPCAST(sPAPRTCETable, dma, dma);

        QLIST_REMOVE(tcet, list);

        if (!kvm_enabled() ||

            (kvmppc_remove_spapr_tce(tcet->table, tcet->fd,

                                     tcet->window_size) != 0)) {

            g_free(tcet->table);

        }

        g_free(tcet);

    }

}

static target_ulong put_tce_emu(sPAPRTCETable *tcet, target_ulong ioba,

                                target_ulong tce)

{

    sPAPRTCE *tcep;

    if (ioba >= tcet->window_size) {

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

                      TARGET_FMT_lx "\n", ioba);

        return H_PARAMETER;

    }

    tcep = tcet->table + (ioba >> SPAPR_TCE_PAGE_SHIFT);

    tcep->tce = tce;

    return H_SUCCESS;

}

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

                              target_ulong opcode, target_ulong *args)

{

    target_ulong liobn = args[0];

    target_ulong ioba = args[1];

    target_ulong tce = args[2];

    sPAPRTCETable *tcet = spapr_tce_find_by_liobn(liobn);

    if (liobn & 0xFFFFFFFF00000000ULL) {

        hcall_dprintf("spapr_vio_put_tce on out-of-boundsw LIOBN "

                      TARGET_FMT_lx "\n", liobn);

        return H_PARAMETER;

    }

    ioba &= ~(SPAPR_TCE_PAGE_SIZE - 1);

    if (tcet) {

        return put_tce_emu(tcet, ioba, tce);

    }

#ifdef DEBUG_TCE

    fprintf(stderr, "%s on liobn=" TARGET_FMT_lx /*%s*/

            "  ioba 0x" TARGET_FMT_lx "  TCE 0x" TARGET_FMT_lx "\n",

            __func__, liobn, /*dev->qdev.id, */ioba, tce);

#endif

    return H_PARAMETER;

}

void spapr_iommu_init(void)

{

    QLIST_INIT(&spapr_tce_tables);

    /* hcall-tce */

    spapr_register_hypercall(H_PUT_TCE, h_put_tce);

}

int spapr_dma_dt(void *fdt, int node_off, const char *propname,

                 DMAContext *dma)

{

    if (dma) {

        sPAPRTCETable *tcet = DO_UPCAST(sPAPRTCETable, dma, dma);

        uint32_t dma_prop[] = {cpu_to_be32(tcet->liobn),

                               0, 0,

                               0, cpu_to_be32(tcet->window_size)};

        int ret;

        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, propname, dma_prop,

                          sizeof(dma_prop));

        if (ret < 0) {

            return ret;

        }

    }

    return 0;

}