Re: [PATCH 06/16] include/qom/cpu.h: Add new get_phys_page_asidx_debug method

["Edgar E. Iglesias" <edgar.iglesias@gmail.com>]

On Thu, Nov 05, 2015 at 06:15:48PM +0000, Peter Maydell wrote:
> Add a new optional method get_phys_page_asidx_debug to CPUClass.
> This is like the existing get_phys_page_debug, but also returns
> the address space index to use for the access. This is necessary
> for CPUs which have multiple address spaces.
> 
> We provide a wrapper function cpu_get_phys_page_asidx_debug()
> which falls back to the existing get_phys_page_debug(), so we
> don't need to change every target CPU.


Reviewed-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com>


> 
> Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
> ---
>  include/qom/cpu.h | 34 ++++++++++++++++++++++++++++++++--
>  1 file changed, 32 insertions(+), 2 deletions(-)
> 
> diff --git a/include/qom/cpu.h b/include/qom/cpu.h
> index ae17932..10ef5cc 100644
> --- a/include/qom/cpu.h
> +++ b/include/qom/cpu.h
> @@ -98,6 +98,9 @@ struct TranslationBlock;
>   * #TranslationBlock.
>   * @handle_mmu_fault: Callback for handling an MMU fault.
>   * @get_phys_page_debug: Callback for obtaining a physical address.
> + * @get_phys_page_asidx_debug: Callback for obtaining a physical address and the
> + *       associated address index. CPUs which have more than one AddressSpace
> + *       should implement this instead of get_phys_page_debug.
>   * @gdb_read_register: Callback for letting GDB read a register.
>   * @gdb_write_register: Callback for letting GDB write a register.
>   * @debug_excp_handler: Callback for handling debug exceptions.
> @@ -152,6 +155,7 @@ typedef struct CPUClass {
>      int (*handle_mmu_fault)(CPUState *cpu, vaddr address, int rw,
>                              int mmu_index);
>      hwaddr (*get_phys_page_debug)(CPUState *cpu, vaddr addr);
> +    hwaddr (*get_phys_page_asidx_debug)(CPUState *cpu, vaddr addr, int *asidx);
>      int (*gdb_read_register)(CPUState *cpu, uint8_t *buf, int reg);
>      int (*gdb_write_register)(CPUState *cpu, uint8_t *buf, int reg);
>      void (*debug_excp_handler)(CPUState *cpu);
> @@ -445,6 +449,32 @@ void cpu_dump_statistics(CPUState *cpu, FILE *f, fprintf_function cpu_fprintf,
>  
>  #ifndef CONFIG_USER_ONLY
>  /**
> + * cpu_get_phys_page_asidx_debug:
> + * @cpu: The CPU to obtain the physical page address for.
> + * @addr: The virtual address.
> + * @asidx: Updated on return with the address space index for this access.
> + *
> + * Obtains the physical page corresponding to a virtual one, together
> + * with the corresponding address space index indicating which AddressSpace
> + * to look the physical address up in.
> + * Use it only for debugging because no protection checks are done.
> + *
> + * Returns: Corresponding physical page address or -1 if no page found.
> + */
> +static inline hwaddr cpu_get_phys_page_asidx_debug(CPUState *cpu, vaddr addr,
> +                                                   int *asidx)
> +{
> +    CPUClass *cc = CPU_GET_CLASS(cpu);
> +
> +    if (cc->get_phys_page_asidx_debug) {
> +        return cc->get_phys_page_asidx_debug(cpu, addr, asidx);
> +    }
> +    /* Fallback for CPUs which don't have multiple address spaces */
> +    *asidx = 0;
> +    return cc->get_phys_page_debug(cpu, addr);
> +}
> +
> +/**
>   * cpu_get_phys_page_debug:
>   * @cpu: The CPU to obtain the physical page address for.
>   * @addr: The virtual address.
> @@ -456,9 +486,9 @@ void cpu_dump_statistics(CPUState *cpu, FILE *f, fprintf_function cpu_fprintf,
>   */
>  static inline hwaddr cpu_get_phys_page_debug(CPUState *cpu, vaddr addr)
>  {
> -    CPUClass *cc = CPU_GET_CLASS(cpu);
> +    int asidx;
>  
> -    return cc->get_phys_page_debug(cpu, addr);
> +    return cpu_get_phys_page_asidx_debug(cpu, addr, &asidx);
>  }
>  #endif
>  
> -- 
> 1.9.1
>