* Is the SIL 3112 capable of PMP support?
@ 2006-11-13 6:29 Brad Campbell
2006-11-13 13:38 ` Jeff Garzik
0 siblings, 1 reply; 4+ messages in thread
From: Brad Campbell @ 2006-11-13 6:29 UTC (permalink / raw)
To: linux-ide
G'day all,
I've been planning on doing some testing with PMP's and noticed that sata_sil does not support PMP.
Is that a hardware limitation or just that nobody has implemented it in the driver yet ?
Brad
--
"Human beings, who are almost unique in having the ability
to learn from the experience of others, are also remarkable
for their apparent disinclination to do so." -- Douglas Adams
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: Is the SIL 3112 capable of PMP support?
2006-11-13 6:29 Is the SIL 3112 capable of PMP support? Brad Campbell
@ 2006-11-13 13:38 ` Jeff Garzik
2006-11-13 14:03 ` Tejun Heo
0 siblings, 1 reply; 4+ messages in thread
From: Jeff Garzik @ 2006-11-13 13:38 UTC (permalink / raw)
To: Brad Campbell; +Cc: linux-ide
Brad Campbell wrote:
> I've been planning on doing some testing with PMP's and noticed that
> sata_sil does not support PMP. Is that a hardware limitation or just
> that nobody has implemented it in the driver yet ?
Well, it doesn't support hardware context switching. It probably
supports PMP "the slow way" (one PMP-attached device at a time)
Jeff
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: Is the SIL 3112 capable of PMP support?
2006-11-13 13:38 ` Jeff Garzik
@ 2006-11-13 14:03 ` Tejun Heo
2006-11-14 12:29 ` Brad Campbell
0 siblings, 1 reply; 4+ messages in thread
From: Tejun Heo @ 2006-11-13 14:03 UTC (permalink / raw)
To: Jeff Garzik; +Cc: Brad Campbell, linux-ide
Jeff Garzik wrote:
> Brad Campbell wrote:
>> I've been planning on doing some testing with PMP's and noticed that
>> sata_sil does not support PMP. Is that a hardware limitation or just
>> that nobody has implemented it in the driver yet ?
>
> Well, it doesn't support hardware context switching. It probably
> supports PMP "the slow way" (one PMP-attached device at a time)
I doubt 3112 can do pmp even "the slow way". It doesn't expose FIS
interface nor does it have PMP field in its SControl register. It just
can't generate PMP-aware FIS.
--
tejun
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: Is the SIL 3112 capable of PMP support?
2006-11-13 14:03 ` Tejun Heo
@ 2006-11-14 12:29 ` Brad Campbell
0 siblings, 0 replies; 4+ messages in thread
From: Brad Campbell @ 2006-11-14 12:29 UTC (permalink / raw)
To: Tejun Heo; +Cc: Jeff Garzik, linux-ide
Tejun Heo wrote:
> Jeff Garzik wrote:
>> Brad Campbell wrote:
>>> I've been planning on doing some testing with PMP's and noticed that
>>> sata_sil does not support PMP. Is that a hardware limitation or just
>>> that nobody has implemented it in the driver yet ?
>>
>> Well, it doesn't support hardware context switching. It probably
>> supports PMP "the slow way" (one PMP-attached device at a time)
>
> I doubt 3112 can do pmp even "the slow way". It doesn't expose FIS
> interface nor does it have PMP field in its SControl register. It just
> can't generate PMP-aware FIS.
>
That answers the question nicely then. Time to upgrade to some 3124's I guess.
Brad
--
"Human beings, who are almost unique in having the ability
to learn from the experience of others, are also remarkable
for their apparent disinclination to do so." -- Douglas Adams
^ permalink raw reply [flat|nested] 4+ messages in thread
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2006-11-13 6:29 Is the SIL 3112 capable of PMP support? Brad Campbell
2006-11-13 13:38 ` Jeff Garzik
2006-11-13 14:03 ` Tejun Heo
2006-11-14 12:29 ` Brad Campbell
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