[v2,29/42] esp: remove pdma_origin from ESPState

Now that all data is transferred via the FIFO (ti_buf) there is no need to track
the source buffer being used for the data transfer. This also eliminates the
need for a separate subsection for PDMA state migration.

Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
---
 hw/scsi/esp.c         | 74 +++++--------------------------------------
 include/hw/scsi/esp.h |  6 ----
 2 files changed, 8 insertions(+), 72 deletions(-)

Le 09/02/2021 à 20:30, Mark Cave-Ayland a écrit :
> Now that all data is transferred via the FIFO (ti_buf) there is no need to track
> the source buffer being used for the data transfer. This also eliminates the
> need for a separate subsection for PDMA state migration.
> 
> Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
> ---
>  hw/scsi/esp.c         | 74 +++++--------------------------------------
>  include/hw/scsi/esp.h |  6 ----
>  2 files changed, 8 insertions(+), 72 deletions(-)
> 
> diff --git a/hw/scsi/esp.c b/hw/scsi/esp.c
> index 5dcd4cd651..7671cc398d 100644
> --- a/hw/scsi/esp.c
> +++ b/hw/scsi/esp.c
> @@ -127,32 +127,14 @@ static uint32_t esp_get_stc(ESPState *s)
>      return dmalen;
>  }
>  
> -static void set_pdma(ESPState *s, enum pdma_origin_id origin)
> -{
> -    s->pdma_origin = origin;
> -}
> -
>  static uint8_t esp_pdma_read(ESPState *s)
>  {
>      uint8_t val;
>  
> -    switch (s->pdma_origin) {
> -    case TI:
> -        if (s->do_cmd) {
> -            val = s->cmdbuf[s->cmdlen++];
> -        } else {
> -            val = s->ti_buf[s->ti_rptr++];
> -        }
> -        break;
> -    case ASYNC:
> -        val = s->async_buf[0];
> -        if (s->async_len > 0) {
> -            s->async_len--;
> -            s->async_buf++;
> -        }
> -        break;
> -    default:
> -        g_assert_not_reached();
> +    if (s->do_cmd) {
> +        val = s->cmdbuf[s->cmdlen++];
> +    } else {
> +        val = s->ti_buf[s->ti_rptr++];
>      }
>  
>      return val;
> @@ -166,23 +148,10 @@ static void esp_pdma_write(ESPState *s, uint8_t val)
>          return;
>      }
>  
> -    switch (s->pdma_origin) {
> -    case TI:
> -        if (s->do_cmd) {
> -            s->cmdbuf[s->cmdlen++] = val;
> -        } else {
> -            s->ti_buf[s->ti_wptr++] = val;
> -        }
> -        break;
> -    case ASYNC:
> -        s->async_buf[0] = val;
> -        if (s->async_len > 0) {
> -            s->async_len--;
> -            s->async_buf++;
> -        }
> -        break;
> -    default:
> -        g_assert_not_reached();
> +    if (s->do_cmd) {
> +        s->cmdbuf[s->cmdlen++] = val;
> +    } else {
> +        s->ti_buf[s->ti_wptr++] = val;
>      }
>  
>      dmalen--;
> @@ -232,7 +201,6 @@ static uint32_t get_cmd(ESPState *s)
>          if (s->dma_memory_read) {
>              s->dma_memory_read(s->dma_opaque, buf, dmalen);
>          } else {
> -            set_pdma(s, TI);
>              if (esp_select(s) < 0) {
>                  return -1;
>              }
> @@ -411,7 +379,6 @@ static void write_response(ESPState *s)
>              s->rregs[ESP_RINTR] = INTR_BS | INTR_FC;
>              s->rregs[ESP_RSEQ] = SEQ_CD;
>          } else {
> -            set_pdma(s, TI);
>              s->pdma_cb = write_response_pdma_cb;
>              esp_raise_drq(s);
>              return;
> @@ -522,7 +489,6 @@ static void esp_do_dma(ESPState *s)
>          if (s->dma_memory_read) {
>              s->dma_memory_read(s->dma_opaque, &s->cmdbuf[s->cmdlen], len);
>          } else {
> -            set_pdma(s, TI);
>              s->pdma_cb = do_dma_pdma_cb;
>              esp_raise_drq(s);
>              return;
> @@ -545,7 +511,6 @@ static void esp_do_dma(ESPState *s)
>          if (s->dma_memory_read) {
>              s->dma_memory_read(s->dma_opaque, s->async_buf, len);
>          } else {
> -            set_pdma(s, TI);
>              s->pdma_cb = do_dma_pdma_cb;
>              esp_raise_drq(s);
>              return;
> @@ -562,7 +527,6 @@ static void esp_do_dma(ESPState *s)
>              s->async_len -= len;
>              s->ti_size -= len;
>              esp_set_tc(s, esp_get_tc(s) - len);
> -            set_pdma(s, TI);
>              s->pdma_cb = do_dma_pdma_cb;
>              esp_raise_drq(s);
>  
> @@ -899,24 +863,6 @@ static bool esp_mem_accepts(void *opaque, hwaddr addr,
>      return (size == 1) || (is_write && size == 4);
>  }
>  
> -static bool esp_pdma_needed(void *opaque)
> -{
> -    ESPState *s = opaque;
> -    return s->dma_memory_read == NULL && s->dma_memory_write == NULL &&
> -           s->dma_enabled;
> -}
> -
> -static const VMStateDescription vmstate_esp_pdma = {
> -    .name = "esp/pdma",
> -    .version_id = 2,
> -    .minimum_version_id = 2,
> -    .needed = esp_pdma_needed,
> -    .fields = (VMStateField[]) {
> -        VMSTATE_INT32(pdma_origin, ESPState),
> -        VMSTATE_END_OF_LIST()
> -    }
> -};
> -
>  static bool esp_is_before_version_5(void *opaque, int version_id)
>  {
>      ESPState *s = ESP(opaque);
> @@ -971,10 +917,6 @@ const VMStateDescription vmstate_esp = {
>          VMSTATE_UINT32_TEST(mig_dma_left, ESPState, esp_is_before_version_5),
>          VMSTATE_END_OF_LIST()
>      },
> -    .subsections = (const VMStateDescription * []) {
> -        &vmstate_esp_pdma,
> -        NULL
> -    }
>  };
>  
>  static void sysbus_esp_mem_write(void *opaque, hwaddr addr,
> diff --git a/include/hw/scsi/esp.h b/include/hw/scsi/esp.h
> index a8d5bf8a63..6618f4e091 100644
> --- a/include/hw/scsi/esp.h
> +++ b/include/hw/scsi/esp.h
> @@ -15,11 +15,6 @@ typedef void (*ESPDMAMemoryReadWriteFunc)(void *opaque, uint8_t *buf, int len);
>  
>  typedef struct ESPState ESPState;
>  
> -enum pdma_origin_id {
> -    TI,
> -    ASYNC,
> -};
> -
>  #define TYPE_ESP "esp"
>  OBJECT_DECLARE_SIMPLE_TYPE(ESPState, ESP)
>  
> @@ -55,7 +50,6 @@ struct ESPState {
>      ESPDMAMemoryReadWriteFunc dma_memory_write;
>      void *dma_opaque;
>      void (*dma_cb)(ESPState *s);
> -    int pdma_origin;
>      void (*pdma_cb)(ESPState *s);
>  
>      uint8_t mig_version_id;
> 

Reviewed-by: Laurent Vivier <laurent@vivier.eu>