Re: [Qemu-devel] [PATCH 12/15] PPC: dbdma: Move processing to io

["Andreas Färber" <afaerber@suse.de>]

Am 30.06.2013 03:27, schrieb Alexander Graf:
> Soon we will introduce intermediate processing pauses which will
> allow the bottom half to restart a DMA request that couldn't be
> fulfilled yet.
> 
> For that to work, move the processing variable into the io struct
> which is what DMA providers work with.
> 
> Signed-off-by: Alexander Graf <agraf@suse.de>
> ---
>  hw/misc/macio/mac_dbdma.c  | 10 ++++++----
>  include/hw/ppc/mac_dbdma.h |  3 ++-
>  2 files changed, 8 insertions(+), 5 deletions(-)
> 
> diff --git a/hw/misc/macio/mac_dbdma.c b/hw/misc/macio/mac_dbdma.c
> index 324ac54..91b9eaf 100644
> --- a/hw/misc/macio/mac_dbdma.c
> +++ b/hw/misc/macio/mac_dbdma.c
> @@ -275,7 +275,9 @@ static void dbdma_end(DBDMA_io *io)
>      conditional_branch(ch);
>  
>  wait:
> -    ch->processing = 0;
> +    /* Indicate that we're ready for a new DMA round */
> +    ch->io.processing = 0;
> +
>      if ((ch->regs[DBDMA_STATUS] & RUN) &&
>          (ch->regs[DBDMA_STATUS] & ACTIVE))
>          channel_run(ch);
> @@ -301,7 +303,7 @@ static void start_output(DBDMA_channel *ch, int key, uint32_t addr,
>      ch->io.is_last = is_last;
>      ch->io.dma_end = dbdma_end;
>      ch->io.is_dma_out = 1;
> -    ch->processing = 1;
> +    ch->io.processing = 1;
>      if (ch->rw) {
>          ch->rw(&ch->io);
>      }
> @@ -327,7 +329,7 @@ static void start_input(DBDMA_channel *ch, int key, uint32_t addr,
>      ch->io.is_last = is_last;
>      ch->io.dma_end = dbdma_end;
>      ch->io.is_dma_out = 0;
> -    ch->processing = 1;
> +    ch->io.processing = 1;
>      if (ch->rw) {
>          ch->rw(&ch->io);
>      }
> @@ -525,7 +527,7 @@ static void DBDMA_run(DBDMAState *s)
>      for (channel = 0; channel < DBDMA_CHANNELS; channel++) {
>          DBDMA_channel *ch = &s->channels[channel];
>          uint32_t status = ch->regs[DBDMA_STATUS];
> -        if (!ch->processing && (status & RUN) && (status & ACTIVE)) {
> +        if (!ch->io.processing && (status & RUN) && (status & ACTIVE)) {
>              channel_run(ch);
>          }
>      }
> diff --git a/include/hw/ppc/mac_dbdma.h b/include/hw/ppc/mac_dbdma.h
> index eb8e0f0..8ad1b6e 100644
> --- a/include/hw/ppc/mac_dbdma.h
> +++ b/include/hw/ppc/mac_dbdma.h
> @@ -37,6 +37,8 @@ struct DBDMA_io {
>      int is_last;
>      int is_dma_out;
>      DBDMA_end dma_end;
> +    /* DMA is in progress, don't start another one */
> +    int processing;

Can it be changed to bool (its users to true/false) while at it?

Andreas

>  };
>  
>  /*
> @@ -148,7 +150,6 @@ typedef struct DBDMA_channel {
>      DBDMA_rw rw;
>      DBDMA_flush flush;
>      dbdma_cmd current;
> -    int processing;
>  } DBDMA_channel;
>  
>  typedef struct {

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