Re: [Qemu-devel] [PATCH] ide save/restore pio/atapi cmd transfer fields and io buffer

[Anthony Liguori]

On 02/11/2010 02:19 PM, Marcelo Tosatti wrote:
> Save/restore information necessary to continue in progress PIO/ATAPI CMD
> transfers.
>
> This includes the IO buffer.
>
> Signed-off-by: Marcelo Tosatti<address@hidden>
>    

Applied.  Thanks.

Regards,

Anthony Liguori

> diff --git a/hw/ide/core.c b/hw/ide/core.c
> index b6643e8..64aebc2 100644
> --- a/hw/ide/core.c
> +++ b/hw/ide/core.c
> @@ -2640,6 +2640,7 @@ void ide_init2(IDEBus *bus, DriveInfo *hd0, DriveInfo 
> *hd1,
>           s->unit = i;
>           s->drive_serial = drive_serial++;
>           s->io_buffer = qemu_blockalign(s->bs, IDE_DMA_BUF_SECTORS*512 + 4);
> +        s->io_buffer_total_len = IDE_DMA_BUF_SECTORS*512 + 4;
>           s->smart_selftest_data = qemu_blockalign(s->bs, 512);
>           s->sector_write_timer = qemu_new_timer(vm_clock,
>                                                  ide_sector_write_timer_cb, s);
> @@ -2674,6 +2675,25 @@ static bool is_identify_set(void *opaque, int version_id)
>       return s->identify_set != 0;
>   }
>
> +static EndTransferFunc* transfer_end_table[] = {
> +        ide_sector_read,
> +        ide_sector_write,
> +        ide_transfer_stop,
> +        ide_atapi_cmd_reply_end,
> +        ide_atapi_cmd,
> +};
> +
> +static int transfer_end_table_idx(EndTransferFunc *fn)
> +{
> +    int i;
> +
> +    for (i = 0; i<  ARRAY_SIZE(transfer_end_table); i++)
> +        if (transfer_end_table[i] == fn)
> +            return i;
> +
> +    return -1;
> +}
> +
>   static int ide_drive_post_load(void *opaque, int version_id)
>   {
>       IDEState *s = opaque;
> @@ -2684,14 +2704,42 @@ static int ide_drive_post_load(void *opaque, int 
> version_id)
>               s->cdrom_changed = 1;
>           }
>       }
> +
> +    if (s->cur_io_buffer_len) {
> +        s->end_transfer_func = transfer_end_table[s->end_transfer_fn_idx];
> +        s->data_ptr = s->io_buffer + s->cur_io_buffer_offset;
> +        s->data_end = s->data_ptr + s->cur_io_buffer_len;
> +    }
> +
>       return 0;
>   }
>
> +static void ide_drive_pre_save(void *opaque)
> +{
> +    IDEState *s = opaque;
> +
> +    s->cur_io_buffer_len = 0;
> +
> +    if (!(s->status&  DRQ_STAT))
> +        return;
> +
> +    s->cur_io_buffer_offset = s->data_ptr - s->io_buffer;
> +    s->cur_io_buffer_len = s->data_end - s->data_ptr;
> +
> +    s->end_transfer_fn_idx = transfer_end_table_idx(s->end_transfer_func);
> +    if (s->end_transfer_fn_idx == -1) {
> +        fprintf(stderr, "%s: invalid end_transfer_func for DRQ_STAT\n",
> +                        __func__);
> +        s->end_transfer_fn_idx = 2;
> +    }
> +}
> +
>   const VMStateDescription vmstate_ide_drive = {
>       .name = "ide_drive",
> -    .version_id = 3,
> +    .version_id = 4,
>       .minimum_version_id = 0,
>       .minimum_version_id_old = 0,
> +    .pre_save = ide_drive_pre_save,
>       .post_load = ide_drive_post_load,
>       .fields      = (VMStateField []) {
>           VMSTATE_INT32(mult_sectors, IDEState),
> @@ -2714,7 +2762,14 @@ const VMStateDescription vmstate_ide_drive = {
>           VMSTATE_UINT8(sense_key, IDEState),
>           VMSTATE_UINT8(asc, IDEState),
>           VMSTATE_UINT8_V(cdrom_changed, IDEState, 3),
> -        /* XXX: if a transfer is pending, we do not save it yet */
> +        VMSTATE_INT32_V(req_nb_sectors, IDEState, 4),
> +        VMSTATE_VARRAY_INT32(io_buffer, IDEState, io_buffer_total_len, 4,
> +                            vmstate_info_uint8, uint8_t),
> +        VMSTATE_INT32_V(cur_io_buffer_offset, IDEState, 4),
> +        VMSTATE_INT32_V(cur_io_buffer_len, IDEState, 4),
> +        VMSTATE_UINT8_V(end_transfer_fn_idx, IDEState, 4),
> +        VMSTATE_INT32_V(elementary_transfer_size, IDEState, 4),
> +        VMSTATE_INT32_V(packet_transfer_size, IDEState, 4),
>           VMSTATE_END_OF_LIST()
>       }
>   };
> diff --git a/hw/ide/internal.h b/hw/ide/internal.h
> index 1cc4b55..8615d1a 100644
> --- a/hw/ide/internal.h
> +++ b/hw/ide/internal.h
> @@ -417,6 +417,11 @@ struct IDEState {
>       uint8_t *data_ptr;
>       uint8_t *data_end;
>       uint8_t *io_buffer;
> +    /* PIO save/restore */
> +    int32_t io_buffer_total_len;
> +    int cur_io_buffer_offset;
> +    int cur_io_buffer_len;
> +    uint8_t end_transfer_fn_idx;
>       QEMUTimer *sector_write_timer; /* only used for win2k install hack */
>       uint32_t irq_count; /* counts IRQs when using win2k install hack */
>       /* CF-ATA extended error */
>
>
>
>