armv8_cache.c

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// SPDX-License-Identifier: GPL-2.0-or-later
 
/***************************************************************************
 *   Copyright (C) 2016 by Matthias Welwarsky                              *
 *   matthias.welwarsky@sysgo.com                                          *
 ***************************************************************************/
 
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
 
#include "armv8_cache.h"
#include "armv8_dpm.h"
#include "armv8_opcodes.h"
#include "smp.h"
 
/* CLIDR cache types */
#define CACHE_LEVEL_HAS_UNIFIED_CACHE   0x4
#define CACHE_LEVEL_HAS_D_CACHE     0x2
#define CACHE_LEVEL_HAS_I_CACHE     0x1
 
static int armv8_d_cache_sanity_check(struct armv8_common *armv8)
{
    struct armv8_cache_common *armv8_cache = &armv8->armv8_mmu.armv8_cache;
 
    if (armv8_cache->d_u_cache_enabled)
        return ERROR_OK;
 
    return ERROR_TARGET_INVALID;
}
 
static int armv8_i_cache_sanity_check(struct armv8_common *armv8)
{
    struct armv8_cache_common *armv8_cache = &armv8->armv8_mmu.armv8_cache;
 
    if (armv8_cache->i_cache_enabled)
        return ERROR_OK;
 
    return ERROR_TARGET_INVALID;
}
 
static int armv8_cache_d_inner_flush_level(struct armv8_common *armv8, struct armv8_cachesize *size, int cl)
{
    struct arm_dpm *dpm = armv8->arm.dpm;
    int retval = ERROR_OK;
    int32_t c_way, c_index = size->index;
 
    LOG_DEBUG("cl %" PRId32, cl);
    do {
        c_way = size->way;
        do {
            uint32_t value = (c_index << size->index_shift)
                | (c_way << size->way_shift) | (cl << 1);
            /*
             * DC CISW - Clean and invalidate data cache
             * line by Set/Way.
             */
            retval = dpm->instr_write_data_r0(dpm,
                    armv8_opcode(armv8, ARMV8_OPC_DCCISW), value);
            if (retval != ERROR_OK)
                goto done;
            c_way -= 1;
        } while (c_way >= 0);
        c_index -= 1;
    } while (c_index >= 0);
 
 done:
    return retval;
}
 
static int armv8_cache_d_inner_clean_inval_all(struct armv8_common *armv8)
{
    struct armv8_cache_common *cache = &(armv8->armv8_mmu.armv8_cache);
    struct arm_dpm *dpm = armv8->arm.dpm;
    int cl;
    int retval;
 
    retval = armv8_d_cache_sanity_check(armv8);
    if (retval != ERROR_OK)
        return retval;
 
    retval = dpm->prepare(dpm);
    if (retval != ERROR_OK)
        goto done;
 
    for (cl = 0; cl < cache->loc; cl++) {
        /* skip i-only caches */
        if (cache->arch[cl].ctype < CACHE_LEVEL_HAS_D_CACHE)
            continue;
 
        armv8_cache_d_inner_flush_level(armv8, &cache->arch[cl].d_u_size, cl);
    }
 
    retval = dpm->finish(dpm);
    return retval;
 
done:
    LOG_ERROR("clean invalidate failed");
    dpm->finish(dpm);
 
    return retval;
}
 
int armv8_cache_d_inner_flush_virt(struct armv8_common *armv8, target_addr_t va, size_t size)
{
    struct arm_dpm *dpm = armv8->arm.dpm;
    struct armv8_cache_common *armv8_cache = &armv8->armv8_mmu.armv8_cache;
    uint64_t linelen = armv8_cache->dminline;
    target_addr_t va_line, va_end;
    int retval;
 
    retval = armv8_d_cache_sanity_check(armv8);
    if (retval != ERROR_OK)
        return retval;
 
    retval = dpm->prepare(dpm);
    if (retval != ERROR_OK)
        goto done;
 
    va_line = va & (-linelen);
    va_end = va + size;
 
    while (va_line < va_end) {
        /* DC CIVAC */
        /* Aarch32: DCCIMVAC: ARMV4_5_MCR(15, 0, 0, 7, 14, 1) */
        retval = dpm->instr_write_data_r0_64(dpm,
                armv8_opcode(armv8, ARMV8_OPC_DCCIVAC), va_line);
        if (retval != ERROR_OK)
            goto done;
        va_line += linelen;
    }
 
    dpm->finish(dpm);
    return retval;
 
done:
    LOG_ERROR("d-cache invalidate failed");
    dpm->finish(dpm);
 
    return retval;
}
 
int armv8_cache_i_inner_inval_virt(struct armv8_common *armv8, target_addr_t va, size_t size)
{
    struct arm_dpm *dpm = armv8->arm.dpm;
    struct armv8_cache_common *armv8_cache = &armv8->armv8_mmu.armv8_cache;
    uint64_t linelen = armv8_cache->iminline;
    target_addr_t va_line, va_end;
    int retval;
 
    retval = armv8_i_cache_sanity_check(armv8);
    if (retval != ERROR_OK)
        return retval;
 
    retval = dpm->prepare(dpm);
    if (retval != ERROR_OK)
        goto done;
 
    va_line = va & (-linelen);
    va_end = va + size;
 
    while (va_line < va_end) {
        /* IC IVAU - Invalidate instruction cache by VA to PoU. */
        retval = dpm->instr_write_data_r0_64(dpm,
                armv8_opcode(armv8, ARMV8_OPC_ICIVAU), va_line);
        if (retval != ERROR_OK)
            goto done;
        va_line += linelen;
    }
 
    dpm->finish(dpm);
    return retval;
 
done:
    LOG_ERROR("d-cache invalidate failed");
    dpm->finish(dpm);
 
    return retval;
}
 
static int armv8_handle_inner_cache_info_command(struct command_invocation *cmd,
    struct armv8_cache_common *armv8_cache)
{
    int cl;
 
    if (armv8_cache->info == -1) {
        command_print(cmd, "cache not yet identified");
        return ERROR_OK;
    }
 
    for (cl = 0; cl < armv8_cache->loc; cl++) {
        struct armv8_arch_cache *arch = &(armv8_cache->arch[cl]);
 
        if (arch->ctype & 1) {
            command_print(cmd,
                "L%d I-Cache: linelen %" PRIu32
                ", associativity %" PRIu32
                ", nsets %" PRIu32
                ", cachesize %" PRIu32 " KBytes",
                cl+1,
                arch->i_size.linelen,
                arch->i_size.associativity,
                arch->i_size.nsets,
                arch->i_size.cachesize);
        }
 
        if (arch->ctype >= 2) {
            command_print(cmd,
                "L%d D-Cache: linelen %" PRIu32
                ", associativity %" PRIu32
                ", nsets %" PRIu32
                ", cachesize %" PRIu32 " KBytes",
                cl+1,
                arch->d_u_size.linelen,
                arch->d_u_size.associativity,
                arch->d_u_size.nsets,
                arch->d_u_size.cachesize);
        }
    }
 
    return ERROR_OK;
}
 
static int _armv8_flush_all_data(struct target *target)
{
    return armv8_cache_d_inner_clean_inval_all(target_to_armv8(target));
}
 
static int  armv8_flush_all_data(struct target *target)
{
    int retval = ERROR_FAIL;
    /*  check that armv8_cache is correctly identify */
    struct armv8_common *armv8 = target_to_armv8(target);
    if (armv8->armv8_mmu.armv8_cache.info == -1) {
        LOG_ERROR("trying to flush un-identified cache");
        return retval;
    }
 
    if (target->smp) {
        /*  look if all the other target have been flushed in order to flush level
         *  2 */
        struct target_list *head;
        foreach_smp_target(head, target->smp_targets) {
            struct target *curr = head->target;
            if (curr->state == TARGET_HALTED) {
                LOG_TARGET_INFO(curr, "Wait flushing data l1.");
                retval = _armv8_flush_all_data(curr);
            }
        }
    } else
        retval = _armv8_flush_all_data(target);
    return retval;
}
 
static int get_cache_info(struct arm_dpm *dpm, int cl, int ct, uint32_t *cache_reg)
{
    struct armv8_common *armv8 = dpm->arm->arch_info;
    int retval = ERROR_OK;
 
    /*  select cache level */
    retval = dpm->instr_write_data_r0(dpm,
            armv8_opcode(armv8, WRITE_REG_CSSELR),
            (cl << 1) | (ct == 1 ? 1 : 0));
    if (retval != ERROR_OK)
        goto done;
 
    retval = dpm->instr_read_data_r0(dpm,
            armv8_opcode(armv8, READ_REG_CCSIDR),
            cache_reg);
 done:
    return retval;
}
 
static struct armv8_cachesize decode_cache_reg(uint32_t cache_reg)
{
    struct armv8_cachesize size;
    int i = 0;
 
    size.linelen = 16 << (cache_reg & 0x7);
    size.associativity = ((cache_reg >> 3) & 0x3ff) + 1;
    size.nsets = ((cache_reg >> 13) & 0x7fff) + 1;
    size.cachesize = size.linelen * size.associativity * size.nsets / 1024;
 
    /*  compute info for set way operation on cache */
    size.index_shift = (cache_reg & 0x7) + 4;
    size.index = (cache_reg >> 13) & 0x7fff;
    size.way = ((cache_reg >> 3) & 0x3ff);
 
    if (size.way != 0)
        while (((size.way << i) & 0x80000000) == 0)
            i++;
    size.way_shift = i;
 
    return size;
}
 
int armv8_identify_cache(struct armv8_common *armv8)
{
    /*  read cache descriptor */
    int retval = ERROR_FAIL;
    struct arm *arm = &armv8->arm;
    struct arm_dpm *dpm = armv8->arm.dpm;
    uint32_t csselr, clidr, ctr;
    uint32_t cache_reg;
    int cl, ctype;
    struct armv8_cache_common *cache = &(armv8->armv8_mmu.armv8_cache);
 
    retval = dpm->prepare(dpm);
    if (retval != ERROR_OK)
        goto done;
 
    /* check if we're in an unprivileged mode */
    if (armv8_curel_from_core_mode(arm->core_mode) < SYSTEM_CUREL_EL1) {
        retval = armv8_dpm_modeswitch(dpm, ARMV8_64_EL1H);
        if (retval != ERROR_OK)
            return retval;
    }
 
    /* retrieve CTR */
    retval = dpm->instr_read_data_r0(dpm,
            armv8_opcode(armv8, READ_REG_CTR), &ctr);
    if (retval != ERROR_OK)
        goto done;
 
    cache->iminline = 4UL << (ctr & 0xf);
    cache->dminline = 4UL << ((ctr & 0xf0000) >> 16);
    LOG_DEBUG("ctr %" PRIx32 " ctr.iminline %" PRIu32 " ctr.dminline %" PRIu32,
         ctr, cache->iminline, cache->dminline);
 
    /*  retrieve CLIDR */
    retval = dpm->instr_read_data_r0(dpm,
            armv8_opcode(armv8, READ_REG_CLIDR), &clidr);
    if (retval != ERROR_OK)
        goto done;
 
    cache->loc = (clidr & 0x7000000) >> 24;
    LOG_DEBUG("Number of cache levels to PoC %" PRId32, cache->loc);
 
    /*  retrieve selected cache for later restore
     *  MRC p15, 2,<Rd>, c0, c0, 0; Read CSSELR */
    retval = dpm->instr_read_data_r0(dpm,
            armv8_opcode(armv8, READ_REG_CSSELR), &csselr);
    if (retval != ERROR_OK)
        goto done;
 
    /* retrieve all available inner caches */
    for (cl = 0; cl < cache->loc; clidr >>= 3, cl++) {
 
        /* isolate cache type at current level */
        ctype = clidr & 7;
 
        /* skip reserved values */
        if (ctype > CACHE_LEVEL_HAS_UNIFIED_CACHE)
            continue;
 
        /* separate d or unified d/i cache at this level ? */
        if (ctype & (CACHE_LEVEL_HAS_UNIFIED_CACHE | CACHE_LEVEL_HAS_D_CACHE)) {
            /* retrieve d-cache info */
            retval = get_cache_info(dpm, cl, 0, &cache_reg);
            if (retval != ERROR_OK)
                goto done;
            cache->arch[cl].d_u_size = decode_cache_reg(cache_reg);
 
            LOG_DEBUG("data/unified cache index %" PRIu32 " << %" PRIu32 ", way %" PRIu32 " << %" PRIu32,
                    cache->arch[cl].d_u_size.index,
                    cache->arch[cl].d_u_size.index_shift,
                    cache->arch[cl].d_u_size.way,
                    cache->arch[cl].d_u_size.way_shift);
 
            LOG_DEBUG("cacheline %" PRIu32 " bytes %" PRIu32 " KBytes asso %" PRIu32 " ways",
                    cache->arch[cl].d_u_size.linelen,
                    cache->arch[cl].d_u_size.cachesize,
                    cache->arch[cl].d_u_size.associativity);
        }
 
        /* separate i-cache at this level ? */
        if (ctype & CACHE_LEVEL_HAS_I_CACHE) {
            /* retrieve i-cache info */
            retval = get_cache_info(dpm, cl, 1, &cache_reg);
            if (retval != ERROR_OK)
                goto done;
            cache->arch[cl].i_size = decode_cache_reg(cache_reg);
 
            LOG_DEBUG("instruction cache index %" PRIu32 " << %" PRIu32 ", way %" PRIu32 " << %" PRIu32,
                    cache->arch[cl].i_size.index,
                    cache->arch[cl].i_size.index_shift,
                    cache->arch[cl].i_size.way,
                    cache->arch[cl].i_size.way_shift);
 
            LOG_DEBUG("cacheline %" PRIu32 " bytes %" PRIu32 " KBytes asso %" PRIu32 " ways",
                    cache->arch[cl].i_size.linelen,
                    cache->arch[cl].i_size.cachesize,
                    cache->arch[cl].i_size.associativity);
        }
 
        cache->arch[cl].ctype = ctype;
    }
 
    /*  restore selected cache  */
    dpm->instr_write_data_r0(dpm,
            armv8_opcode(armv8, WRITE_REG_CSSELR), csselr);
    if (retval != ERROR_OK)
        goto done;
 
    armv8->armv8_mmu.armv8_cache.info = 1;
 
    /*  if no l2 cache initialize l1 data cache flush function function */
    if (!armv8->armv8_mmu.armv8_cache.flush_all_data_cache) {
        armv8->armv8_mmu.armv8_cache.display_cache_info =
            armv8_handle_inner_cache_info_command;
        armv8->armv8_mmu.armv8_cache.flush_all_data_cache =
            armv8_flush_all_data;
    }
 
done:
    armv8_dpm_modeswitch(dpm, ARM_MODE_ANY);
    dpm->finish(dpm);
    return retval;
 
}