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SubjectRe: [PATCH] 2.5.13 IDE 52
Uz.ytkownik Jens Axboe napisa?:
> On Sun, May 05 2002, Martin Dalecki wrote:
>
>>- Split up the TCQ UDMA handling stuff in to proper functions. Jens must has
>> been dreaming as he introduced them ;-).
>
>
> This was pending stuff, and why I wrote that the start command tcq = 1
> stuff was a gross hack.

Sure I just did it in one go with the rest of DMA handling changes.
I just wan'ted to get over with this.

>>- int tcq = 0;
>>
>> if (!drive->using_dma)
>> return ide_started;
>>
>> /* for dma commands we don't set the handler */
>>- if (args->taskfile.command == WIN_WRITEDMA || args->taskfile.command == WIN_WRITEDMA_EXT)
>>+ if (args->taskfile.command == WIN_WRITEDMA
>>+ || args->taskfile.command == WIN_WRITEDMA_EXT)
>> dma_act = ide_dma_write;
>>- else if (args->taskfile.command == WIN_READDMA || args->taskfile.command == WIN_READDMA_EXT)
>>+ else if (args->taskfile.command == WIN_READDMA
>>+ || args->taskfile.command == WIN_READDMA_EXT)
>> dma_act = ide_dma_read;
>>- else if (args->taskfile.command == WIN_WRITEDMA_QUEUED || args->taskfile.command == WIN_WRITEDMA_QUEUED_EXT) {
>>- tcq = 1;
>>- dma_act = ide_dma_write_queued;
>>- } else if (args->taskfile.command == WIN_READDMA_QUEUED || args->taskfile.command == WIN_READDMA_QUEUED_EXT) {
>>- tcq = 1;
>>- dma_act = ide_dma_read_queued;
>>- } else {
>>+#ifdef CONFIG_BLK_DEV_IDE_TCQ
>>+ else if (args->taskfile.command == WIN_WRITEDMA_QUEUED
>>+ || args->taskfile.command == WIN_WRITEDMA_QUEUED_EXT
>>+ || args->taskfile.command == WIN_READDMA_QUEUED
>>+ || args->taskfile.command == WIN_READDMA_QUEUED_EXT)
>>+ return udma_tcq_taskfile(drive, rq);
>>+#endif
>>+ else {
>> printk("ata_taskfile: unknown command %x\n", args->taskfile.command);
>> return ide_stopped;
>> }
>>
>>- /*
>>- * FIXME: this is a gross hack, need to unify tcq dma proc and
>>- * regular dma proc -- basically split stuff that needs to act
>>- * on a request from things like ide_dma_check etc.
>>- */
>>- if (tcq)
>>- return drive->channel->udma(dma_act, drive, rq);
>>- else {
>>- if (drive->channel->udma(dma_act, drive, rq))
>>- return ide_stopped;
>>- }
>>+
>>+ if (drive->channel->udma(dma_act, drive, rq))
>>+ return ide_stopped;
>
>
> This is still ugly, IMHO. What I wanted was to split the udma->
> function into two parts, one that acts on a request (ide_dma_read,
> ide_dma_being, etc -- and then also ide_dma_read_queued) ad one that
> does the silly stuff like ide_dma_check etc. Then unify the tcq and
> non-tcq stuff so that udma_rw->(dma_act, drive, rq) always returns
> ide_started or ide_stopped (or ide_released) and kill the #ifdef above.
>
> I don't think udma_tcq_taskfile() should be public like this, and btw I
> think the name really SUCKS! :-). ata_tcq_dma() is much better for
> instance, even though it should be a private stratey. BTW, this goes for
> all your tcq.c renaming.

Sure it sucks. The most sucks the fact that the trasnfer functions
should be folded in the generic context functions. I know.
I have choosen the udma prefix becouse ata_udma wouldn't contain much more
information and just stayed consistant with it for the tcq stuff as well.
Now one can at least understand the work flow of the DMA stuff I think
so cleaning it firther should be easier now.

Please consided it all as a step in between and after reading 54 you should
see where it's going...

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