Thank plenty for your answer.
So , what is the best way to send NCQ through user space ?
Is it possible to disable the tagging mechanism by the driver and only
rely on the tag given by the user space ?
Thanks
On Wed, May 20, 2009 at 10:53 PM, Gwendal Grignou <gwendal@xxxxxxxxxx> wrote:
> Hi Dan,
>
> tf->nsect can not be calculated from user space: the tag must be
> calculated by the driver.
>
> Gwendal.
>
> On Tue, May 19, 2009 at 11:11 AM, Dan Porat <dan.porat@xxxxxxxxx> wrote:
>> As I have seen sg_io does not support NCQ in ATA passthrough.
>> will changing the mapping function libata-scsi.c (line 2745) , work?
>>
>> If not , how else can I check the protocol (FPDMA) ?
>> static u8
>> 2725ata_scsi_map_proto(u8 byte1)
>> 2726{
>> 2727 switch((byte1 & 0x1e) >> 1) {
>> 2728 case 3: /* Non-data */
>> 2729 return ATA_PROT_NODATA;
>> 2730
>> 2731 case 6: /* DMA */
>> 2732 case 10: /* UDMA Data-in */
>> 2733 case 11: /* UDMA Data-Out */
>> 2734 return ATA_PROT_DMA;
>> 2735
>> 2736 case 4: /* PIO Data-in */
>> 2737 case 5: /* PIO Data-out */
>> 2738 return ATA_PROT_PIO;
>> 2739
>> 2745 case 12: /* FPDMA */
>> return ATA_PROT_NCQ
>> 2740 case 0: /* Hard Reset */
>> 2741 case 1: /* SRST */
>> 2742 case 8: /* Device Diagnostic */
>> 2743 case 9: /* Device Reset */
>> 2744 case 7: /* DMA Queued */
>>
>> 2746 case 15: /* Return Response Info */
>> 2747 default: /* Reserved */
>> 2748 break;
>> 2749 }
>> 2750
>> 2751 return ATA_PROT_UNKNOWN;
>> 2752}
>>
>>
>>
>> Thanks
>>
>> Dan Porat
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