Re: [PATCH 25/43] target/ppc: Remove bat_size_prot()

[Nicholas Piggin]

On Mon May 27, 2024 at 9:13 AM AEST, BALATON Zoltan wrote:
> There is already a hash32_bat_prot() function that does most if this
> and the rest can be inlined. Export hash32_bat_prot() and rename it to
> ppc_hash32_bat_prot() to match other functions and use it in
> get_bat_6xx_tlb().

Reviewed-by: Nicholas Piggin <npiggin@gmail.com>

>
> Signed-off-by: BALATON Zoltan <balaton@eik.bme.hu>
> ---
>  target/ppc/mmu-hash32.c | 18 +-------------
>  target/ppc/mmu-hash32.h | 14 +++++++++++
>  target/ppc/mmu_common.c | 52 ++++++++++-------------------------------
>  3 files changed, 27 insertions(+), 57 deletions(-)
>
> diff --git a/target/ppc/mmu-hash32.c b/target/ppc/mmu-hash32.c
> index 160311de87..6f0f0bbb00 100644
> --- a/target/ppc/mmu-hash32.c
> +++ b/target/ppc/mmu-hash32.c
> @@ -48,22 +48,6 @@ static target_ulong hash32_bat_size(int mmu_idx,
>      return BATU32_BEPI & ~((batu & BATU32_BL) << 15);
>  }
>  
> -static int hash32_bat_prot(PowerPCCPU *cpu,
> -                           target_ulong batu, target_ulong batl)
> -{
> -    int pp, prot;
> -
> -    prot = 0;
> -    pp = batl & BATL32_PP;
> -    if (pp != 0) {
> -        prot = PAGE_READ | PAGE_EXEC;
> -        if (pp == 0x2) {
> -            prot |= PAGE_WRITE;
> -        }
> -    }
> -    return prot;
> -}
> -
>  static hwaddr ppc_hash32_bat_lookup(PowerPCCPU *cpu, target_ulong ea,
>                                      MMUAccessType access_type, int *prot,
>                                      int mmu_idx)
> @@ -95,7 +79,7 @@ static hwaddr ppc_hash32_bat_lookup(PowerPCCPU *cpu, 
> target_ulong ea,
>          if (mask && ((ea & mask) == (batu & BATU32_BEPI))) {
>              hwaddr raddr = (batl & mask) | (ea & ~mask);
>  
> -            *prot = hash32_bat_prot(cpu, batu, batl);
> +            *prot = ppc_hash32_bat_prot(batu, batl);
>  
>              return raddr & TARGET_PAGE_MASK;
>          }
> diff --git a/target/ppc/mmu-hash32.h b/target/ppc/mmu-hash32.h
> index 5902cf8333..bd75f7d647 100644
> --- a/target/ppc/mmu-hash32.h
> +++ b/target/ppc/mmu-hash32.h
> @@ -143,6 +143,20 @@ static inline int ppc_hash32_prot(bool key, int pp, bool 
> nx)
>      return nx ? prot : prot | PAGE_EXEC;
>  }
>  
> +static inline int ppc_hash32_bat_prot(target_ulong batu, target_ulong batl)
> +{
> +    int prot = 0;
> +    int pp = batl & BATL32_PP;
> +
> +    if (pp) {
> +        prot = PAGE_READ | PAGE_EXEC;
> +        if (pp == 0x2) {
> +            prot |= PAGE_WRITE;
> +        }
> +    }
> +    return prot;
> +}
> +
>  typedef struct {
>      uint32_t pte0, pte1;
>  } ppc_hash_pte32_t;
> diff --git a/target/ppc/mmu_common.c b/target/ppc/mmu_common.c
> index aa002bba35..624ed51a92 100644
> --- a/target/ppc/mmu_common.c
> +++ b/target/ppc/mmu_common.c
> @@ -193,40 +193,13 @@ static int ppc6xx_tlb_check(CPUPPCState *env, hwaddr 
> *raddr, int *prot,
>      return ret;
>  }
>  
> -/* Perform BAT hit & translation */
> -static inline void bat_size_prot(CPUPPCState *env, target_ulong *blp,
> -                                 int *validp, int *protp, target_ulong *BATu,
> -                                 target_ulong *BATl)
> -{
> -    target_ulong bl;
> -    int pp, valid, prot;
> -
> -    bl = (*BATu & BATU32_BL) << 15;
> -    valid = 0;
> -    prot = 0;
> -    if ((!FIELD_EX64(env->msr, MSR, PR) && (*BATu & 0x00000002)) ||
> -        (FIELD_EX64(env->msr, MSR, PR) && (*BATu & 0x00000001))) {
> -        valid = 1;
> -        pp = *BATl & 0x00000003;
> -        if (pp != 0) {
> -            prot = PAGE_READ | PAGE_EXEC;
> -            if (pp == 0x2) {
> -                prot |= PAGE_WRITE;
> -            }
> -        }
> -    }
> -    *blp = bl;
> -    *validp = valid;
> -    *protp = prot;
> -}
> -
>  static int get_bat_6xx_tlb(CPUPPCState *env, mmu_ctx_t *ctx,
> -                           target_ulong eaddr, MMUAccessType access_type)
> +                           target_ulong eaddr, MMUAccessType access_type,
> +                           bool pr)
>  {
>      target_ulong *BATlt, *BATut, *BATu, *BATl;
>      target_ulong BEPIl, BEPIu, bl;
> -    int i, valid, prot;
> -    int ret = -1;
> +    int i, ret = -1;
>      bool ifetch = access_type == MMU_INST_FETCH;
>  
>      qemu_log_mask(CPU_LOG_MMU, "%s: %cBAT v " TARGET_FMT_lx "\n", __func__,
> @@ -243,20 +216,19 @@ static int get_bat_6xx_tlb(CPUPPCState *env, mmu_ctx_t 
> *ctx,
>          BATl = &BATlt[i];
>          BEPIu = *BATu & BATU32_BEPIU;
>          BEPIl = *BATu & BATU32_BEPIL;
> -        bat_size_prot(env, &bl, &valid, &prot, BATu, BATl);
>          qemu_log_mask(CPU_LOG_MMU, "%s: %cBAT%d v " TARGET_FMT_lx " BATu "
>                        TARGET_FMT_lx " BATl " TARGET_FMT_lx "\n", __func__,
>                        ifetch ? 'I' : 'D', i, eaddr, *BATu, *BATl);
> -        if ((eaddr & BATU32_BEPIU) == BEPIu &&
> -            ((eaddr & BATU32_BEPIL) & ~bl) == BEPIl) {
> -            /* BAT matches */
> -            if (valid != 0) {
> +        bl = (*BATu & BATU32_BL) << 15;
> +        if ((!pr && (*BATu & BATU32_VS)) || (pr && (*BATu & BATU32_VP))) {
> +            if ((eaddr & BATU32_BEPIU) == BEPIu &&
> +                ((eaddr & BATU32_BEPIL) & ~bl) == BEPIl) {
>                  /* Get physical address */
>                  ctx->raddr = (*BATl & BATU32_BEPIU) |
>                      ((eaddr & BATU32_BEPIL & bl) | (*BATl & BATU32_BEPIL)) |
>                      (eaddr & 0x0001F000);
>                  /* Compute access rights */
> -                ctx->prot = prot;
> +                ctx->prot = ppc_hash32_bat_prot(*BATu, *BATl);
>                  if (check_prot_access_type(ctx->prot, access_type)) {
>                      qemu_log_mask(CPU_LOG_MMU, "BAT %d match: r " 
> HWADDR_FMT_plx
>                                    " prot=%c%c\n", i, ctx->raddr,
> @@ -300,16 +272,16 @@ static int mmu6xx_get_physical_address(CPUPPCState 
> *env, mmu_ctx_t *ctx,
>      PowerPCCPU *cpu = env_archcpu(env);
>      hwaddr hash;
>      target_ulong vsid, sr, pgidx, ptem;
> -    bool key, pr, ds, nx;
> +    bool key, ds, nx;
> +    bool pr = FIELD_EX64(env->msr, MSR, PR);
>  
>      /* First try to find a BAT entry if there are any */
> -    if (env->nb_BATs && get_bat_6xx_tlb(env, ctx, eaddr, access_type) == 0) {
> +    if (env->nb_BATs &&
> +        get_bat_6xx_tlb(env, ctx, eaddr, access_type, pr) == 0) {
>          return 0;
>      }
>  
>      /* Perform segment based translation when no BATs matched */
> -    pr = FIELD_EX64(env->msr, MSR, PR);
> -
>      sr = env->sr[eaddr >> 28];
>      key = ppc_hash32_key(pr, sr);
>      *keyp = key;