Re: [Qemu-devel] [PATCHv2 07/10] target-ppc: Split 44x tlbiva from ppc_tlb_invalidate_one()

[Benjamin Herrenschmidt <benh@kernel.crashing.org>]

On Wed, 2016-01-27 at 21:13 +1100, David Gibson wrote:
> Currently both the tlbiva instruction (used on 44x chips) and the
> tlbie
> instruction (used on hash MMU chips) are both handled via
> ppc_tlb_invalidate_one().  This is silly, because they're invoked
> from
> different places, and do different things.
> 
> Clean this up by separating out the tlbiva instruction into its own
> handling.  In fact the implementation is only a stub anyway.
> 
> Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

> ---
>  target-ppc/helper.h     |  1 +
>  target-ppc/mmu_helper.c | 14 ++++++++++----
>  target-ppc/translate.c  |  2 +-
>  3 files changed, 12 insertions(+), 5 deletions(-)
> 
> diff --git a/target-ppc/helper.h b/target-ppc/helper.h
> index 869be15..e5a8f7b 100644
> --- a/target-ppc/helper.h
> +++ b/target-ppc/helper.h
> @@ -544,6 +544,7 @@ DEF_HELPER_2(74xx_tlbd, void, env, tl)
>  DEF_HELPER_2(74xx_tlbi, void, env, tl)
>  DEF_HELPER_FLAGS_1(tlbia, TCG_CALL_NO_RWG, void, env)
>  DEF_HELPER_FLAGS_2(tlbie, TCG_CALL_NO_RWG, void, env, tl)
> +DEF_HELPER_FLAGS_2(tlbiva, TCG_CALL_NO_RWG, void, env, tl)
>  #if defined(TARGET_PPC64)
>  DEF_HELPER_FLAGS_3(store_slb, TCG_CALL_NO_RWG, void, env, tl, tl)
>  DEF_HELPER_2(load_slb_esid, tl, env, tl)
> diff --git a/target-ppc/mmu_helper.c b/target-ppc/mmu_helper.c
> index 82ebe5d..e9e0edb 100644
> --- a/target-ppc/mmu_helper.c
> +++ b/target-ppc/mmu_helper.c
> @@ -1971,10 +1971,6 @@ void ppc_tlb_invalidate_one(CPUPPCState *env,
> target_ulong addr)
>              ppc6xx_tlb_invalidate_virt(env, addr, 1);
>          }
>          break;
> -    case POWERPC_MMU_BOOKE:
> -        /* XXX: TODO */
> -        cpu_abort(CPU(cpu), "BookE MMU model is not implemented\n");
> -        break;
>      case POWERPC_MMU_32B:
>      case POWERPC_MMU_601:
>          /* tlbie invalidate TLBs for all segments */
> @@ -2116,6 +2112,16 @@ void helper_tlbie(CPUPPCState *env,
> target_ulong addr)
>      ppc_tlb_invalidate_one(env, addr);
>  }
>  
> +void helper_tlbiva(CPUPPCState *env, target_ulong addr)
> +{
> +    PowerPCCPU *cpu = ppc_env_get_cpu(env);
> +
> +    /* tlbiva instruciton only exists on BookE */
> +    assert(env->mmu_model == POWERPC_MMU_BOOKE);
> +    /* XXX: TODO */
> +    cpu_abort(CPU(cpu), "BookE MMU model is not implemented\n");
> +}
> +
>  /* Software driven TLBs management */
>  /* PowerPC 602/603 software TLB load instructions helpers */
>  static void do_6xx_tlb(CPUPPCState *env, target_ulong new_EPN, int
> is_code)
> diff --git a/target-ppc/translate.c b/target-ppc/translate.c
> index 4be7eaa..a05a169 100644
> --- a/target-ppc/translate.c
> +++ b/target-ppc/translate.c
> @@ -5904,7 +5904,7 @@ static void gen_tlbiva(DisasContext *ctx)
>      }
>      t0 = tcg_temp_new();
>      gen_addr_reg_index(ctx, t0);
> -    gen_helper_tlbie(cpu_env, cpu_gpr[rB(ctx->opcode)]);
> +    gen_helper_tlbiva(cpu_env, cpu_gpr[rB(ctx->opcode)]);
>      tcg_temp_free(t0);
>  #endif
>  }