Re: [Qemu-devel] [PATCH v2 1/1] hw: register: Run post_write hook on reset

[Alistair Francis <alistair23@gmail.com>]

On Mon, Feb 5, 2018 at 10:44 AM, Alistair Francis
<alistair.francis@xilinx.com> wrote:
> Ensure that the post write hook is called during reset. This allows us
> to rely on the post write functions instead of having to call them from
> the reset() function.
>
> Signed-off-by: Alistair Francis <alistair.francis@xilinx.com>
> Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>

Ping!

> ---
>
> V2:
>  - Update the header documentation
>
>  include/hw/register.h | 6 +++---
>  hw/core/register.c    | 8 ++++++++
>  2 files changed, 11 insertions(+), 3 deletions(-)
>
> diff --git a/include/hw/register.h b/include/hw/register.h
> index de2414e6b4..5796584588 100644
> --- a/include/hw/register.h
> +++ b/include/hw/register.h
> @@ -34,7 +34,7 @@ typedef struct RegisterInfoArray RegisterInfoArray;
>   * immediately before the actual write. The returned value is what is written,
>   * giving the handler a chance to modify the written value.
>   * @post_write: Post write callback. Passed the written value. Most write side
> - * effects should be implemented here.
> + * effects should be implemented here. This is called during device reset.
>   *
>   * @post_read: Post read callback. Passes the value that is about to be returned
>   * for a read. The return value from this function is what is ultimately read,
> @@ -135,8 +135,8 @@ uint64_t register_read(RegisterInfo *reg, uint64_t re, const char* prefix,
>                         bool debug);
>
>  /**
> - * reset a register
> - * @reg: register to reset
> + * Resets a register. This will also call the post_write hook if it exists.
> + * @reg: The register to reset.
>   */
>
>  void register_reset(RegisterInfo *reg);
> diff --git a/hw/core/register.c b/hw/core/register.c
> index 900294b9c4..0741a1af32 100644
> --- a/hw/core/register.c
> +++ b/hw/core/register.c
> @@ -159,13 +159,21 @@ uint64_t register_read(RegisterInfo *reg, uint64_t re, const char* prefix,
>
>  void register_reset(RegisterInfo *reg)
>  {
> +    const RegisterAccessInfo *ac;
> +
>      g_assert(reg);
>
>      if (!reg->data || !reg->access) {
>          return;
>      }
>
> +    ac = reg->access;
> +
>      register_write_val(reg, reg->access->reset);
> +
> +    if (ac->post_write) {
> +        ac->post_write(reg, reg->access->reset);
> +    }
>  }
>
>  void register_init(RegisterInfo *reg)
> --
> 2.14.1
>