Re: [RFC v9 20/32] cpu: Move tlb_fill to tcg_ops

["Alex Bennée" <alex.bennee@linaro.org>]

Claudio Fontana <cfontana@suse.de> writes:

> On 12/9/20 12:26 PM, Alex Bennée wrote:
>> 
>> Claudio Fontana <cfontana@suse.de> writes:
>> 
>>> From: Eduardo Habkost <ehabkost@redhat.com>
>>>
>>> Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
>>> [claudio: wrapped in CONFIG_TCG]
>>> Signed-off-by: Claudio Fontana <cfontana@suse.de>
>>> Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
>>> ---
>>>  accel/tcg/cputlb.c              |  6 +++---
>>>  accel/tcg/user-exec.c           |  6 +++---
>>>  include/hw/core/cpu.h           |  9 ---------
>>>  include/hw/core/tcg-cpu-ops.h   | 12 ++++++++++++
>>>  target/alpha/cpu.c              |  2 +-
>>>  target/arm/cpu.c                |  2 +-
>>>  target/avr/cpu.c                |  2 +-
>>>  target/cris/cpu.c               |  2 +-
>>>  target/hppa/cpu.c               |  2 +-
>>>  target/i386/tcg-cpu.c           |  2 +-
>>>  target/lm32/cpu.c               |  2 +-
>>>  target/m68k/cpu.c               |  2 +-
>>>  target/microblaze/cpu.c         |  2 +-
>>>  target/mips/cpu.c               |  2 +-
>>>  target/moxie/cpu.c              |  2 +-
>>>  target/nios2/cpu.c              |  2 +-
>>>  target/openrisc/cpu.c           |  2 +-
>>>  target/ppc/translate_init.c.inc |  2 +-
>>>  target/riscv/cpu.c              |  2 +-
>>>  target/rx/cpu.c                 |  2 +-
>>>  target/s390x/cpu.c              |  2 +-
>>>  target/sh4/cpu.c                |  2 +-
>>>  target/sparc/cpu.c              |  2 +-
>>>  target/tilegx/cpu.c             |  2 +-
>>>  target/tricore/cpu.c            |  2 +-
>>>  target/unicore32/cpu.c          |  2 +-
>>>  target/xtensa/cpu.c             |  2 +-
>>>  27 files changed, 41 insertions(+), 38 deletions(-)
>>>
>>> diff --git a/accel/tcg/cputlb.c b/accel/tcg/cputlb.c
>>> index 42ab79c1a5..2dc71b5528 100644
>>> --- a/accel/tcg/cputlb.c
>>> +++ b/accel/tcg/cputlb.c
>>> @@ -1286,7 +1286,7 @@ static void tlb_fill(CPUState *cpu, target_ulong addr, int size,
>>>       * This is not a probe, so only valid return is success; failure
>>>       * should result in exception + longjmp to the cpu loop.
>>>       */
>>> -    ok = cc->tlb_fill(cpu, addr, size, access_type, mmu_idx, false, retaddr);
>>> +    ok = cc->tcg_ops.tlb_fill(cpu, addr, size, access_type, mmu_idx, false, retaddr);
>>>      assert(ok);
>>>  }
>>>  
>>> @@ -1557,8 +1557,8 @@ static int probe_access_internal(CPUArchState *env, target_ulong addr,
>>>              CPUState *cs = env_cpu(env);
>>>              CPUClass *cc = CPU_GET_CLASS(cs);
>>>  
>>> -            if (!cc->tlb_fill(cs, addr, fault_size, access_type,
>>> -                              mmu_idx, nonfault, retaddr)) {
>>> +            if (!cc->tcg_ops.tlb_fill(cs, addr, fault_size, access_type,
>>> +                                      mmu_idx, nonfault, retaddr)) {
>>>                  /* Non-faulting page table read failed.  */
>>>                  *phost = NULL;
>>>                  return TLB_INVALID_MASK;
>>> diff --git a/accel/tcg/user-exec.c b/accel/tcg/user-exec.c
>>> index 4ebe25461a..7f53992251 100644
>>> --- a/accel/tcg/user-exec.c
>>> +++ b/accel/tcg/user-exec.c
>>> @@ -186,7 +186,7 @@ static inline int handle_cpu_signal(uintptr_t pc, siginfo_t *info,
>>>      clear_helper_retaddr();
>>>  
>>>      cc = CPU_GET_CLASS(cpu);
>>> -    cc->tlb_fill(cpu, address, 0, access_type, MMU_USER_IDX, false, pc);
>>> +    cc->tcg_ops.tlb_fill(cpu, address, 0, access_type, MMU_USER_IDX, false, pc);
>>>      g_assert_not_reached();
>>>  }
>>>  
>>> @@ -216,8 +216,8 @@ static int probe_access_internal(CPUArchState *env, target_ulong addr,
>>>          } else {
>>>              CPUState *cpu = env_cpu(env);
>>>              CPUClass *cc = CPU_GET_CLASS(cpu);
>>> -            cc->tlb_fill(cpu, addr, fault_size, access_type,
>>> -                         MMU_USER_IDX, false, ra);
>>> +            cc->tcg_ops.tlb_fill(cpu, addr, fault_size, access_type,
>>> +                                 MMU_USER_IDX, false, ra);
>>>              g_assert_not_reached();
>>>          }
>>>      }
>>> diff --git a/include/hw/core/cpu.h b/include/hw/core/cpu.h
>>> index 52142e9094..c82ef261c6 100644
>>> --- a/include/hw/core/cpu.h
>>> +++ b/include/hw/core/cpu.h
>>> @@ -110,12 +110,6 @@ struct TranslationBlock;
>>>   *       If the target behaviour here is anything other than "set
>>>   *       the PC register to the value passed in" then the target must
>>>   *       also implement the synchronize_from_tb hook.
>>> - * @tlb_fill: Callback for handling a softmmu tlb miss or user-only
>>> - *       address fault.  For system mode, if the access is valid, call
>>> - *       tlb_set_page and return true; if the access is invalid, and
>>> - *       probe is true, return false; otherwise raise an exception and
>>> - *       do not return.  For user-only mode, always raise an exception
>>> - *       and do not return.
>>>   * @get_phys_page_debug: Callback for obtaining a physical address.
>>>   * @get_phys_page_attrs_debug: Callback for obtaining a physical address and the
>>>   *       associated memory transaction attributes to use for the access.
>>> @@ -183,9 +177,6 @@ struct CPUClass {
>>>      void (*get_memory_mapping)(CPUState *cpu, MemoryMappingList *list,
>>>                                 Error **errp);
>>>      void (*set_pc)(CPUState *cpu, vaddr value);
>>> -    bool (*tlb_fill)(CPUState *cpu, vaddr address, int size,
>>> -                     MMUAccessType access_type, int mmu_idx,
>>> -                     bool probe, uintptr_t retaddr);
>>>      hwaddr (*get_phys_page_debug)(CPUState *cpu, vaddr addr);
>>>      hwaddr (*get_phys_page_attrs_debug)(CPUState *cpu, vaddr addr,
>>>                                          MemTxAttrs *attrs);
>>> diff --git a/include/hw/core/tcg-cpu-ops.h b/include/hw/core/tcg-cpu-ops.h
>>> index e12f32919b..2ea94acca0 100644
>>> --- a/include/hw/core/tcg-cpu-ops.h
>>> +++ b/include/hw/core/tcg-cpu-ops.h
>>> @@ -37,6 +37,18 @@ typedef struct TcgCpuOperations {
>>>      void (*cpu_exec_exit)(CPUState *cpu);
>>>      /** @cpu_exec_interrupt: Callback for processing interrupts in cpu_exec */
>>>      bool (*cpu_exec_interrupt)(CPUState *cpu, int interrupt_request);
>>> +    /**
>>> +     * @tlb_fill: Handle a softmmu tlb miss or user-only address fault
>>> +     *
>>> +     * For system mode, if the access is valid, call tlb_set_page
>>> +     * and return true; if the access is invalid, and probe is
>>> +     * true, return false; otherwise raise an exception and do
>>> +     * not return.  For user-only mode, always raise an exception
>>> +     * and do not return.
>>> +     */
>>> +    bool (*tlb_fill)(CPUState *cpu, vaddr address, int size,
>>> +                     MMUAccessType access_type, int mmu_idx,
>>> +                     bool probe, uintptr_t retaddr);
>> 
>> As per previous patch, here is a chance to clean-up the comment.
>
>
> Could you provide the text? I think you understand this better than I
> do...

As Eduardo pointed out the kernel-doc pass won't work with in-line
functions unless they are extracted and typedefed which seems excessive
considering we don't currently generate docs from these headers. Ignore
the request.

>
>
>> 
>> Otherwise:
>> 
>> Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
>> 
>
> Thanks!
>
> Claudio


-- 
Alex Bennée