* pci_unmap_single() and CONFIG_NOT_COHERENT_CACHE
@ 2003-05-09 18:07 Curtis, Allen
2003-05-09 18:28 ` Roland Dreier
0 siblings, 1 reply; 3+ messages in thread
From: Curtis, Allen @ 2003-05-09 18:07 UTC (permalink / raw)
To: 'linuxppc-embedded@lists.linuxppc.org'
I noticed in pci.h that pci_unmap_single() is a null function. (essentially
does nothing) Shouldn't is call consistent_sync() so that
flush_dcache_range() is called?
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^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: pci_unmap_single() and CONFIG_NOT_COHERENT_CACHE
2003-05-09 18:07 pci_unmap_single() and CONFIG_NOT_COHERENT_CACHE Curtis, Allen
@ 2003-05-09 18:28 ` Roland Dreier
0 siblings, 0 replies; 3+ messages in thread
From: Roland Dreier @ 2003-05-09 18:28 UTC (permalink / raw)
To: Curtis, Allen; +Cc: 'linuxppc-embedded@lists.linuxppc.org'
Allen> I noticed in pci.h that pci_unmap_single() is a null
Allen> function. (essentially does nothing) Shouldn't is call
Allen> consistent_sync() so that flush_dcache_range() is called?
No, the cache invalidate or flush has to happen when pci_map_single()
is used. There's nothing to do after the DMA is done (which is when
pci_unmap_single() gets called).
- Roland
** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
^ permalink raw reply [flat|nested] 3+ messages in thread
* RE: pci_unmap_single() and CONFIG_NOT_COHERENT_CACHE
@ 2003-05-09 19:54 Curtis, Allen
0 siblings, 0 replies; 3+ messages in thread
From: Curtis, Allen @ 2003-05-09 19:54 UTC (permalink / raw)
To: 'Roland Dreier', Curtis, Allen
Cc: 'linuxppc-embedded@lists.linuxppc.org'
>
> Allen> I noticed in pci.h that pci_unmap_single() is a null
> Allen> function. (essentially does nothing) Shouldn't is call
> Allen> consistent_sync() so that flush_dcache_range() is called?
>
>No, the cache invalidate or flush has to happen when pci_map_single()
>is used. There's nothing to do after the DMA is done (which is when
>pci_unmap_single() gets called).
>
Thanks, shortly after pressing the send button I realized that this was a
dumb question.
** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
^ permalink raw reply [flat|nested] 3+ messages in thread
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2003-05-09 18:07 pci_unmap_single() and CONFIG_NOT_COHERENT_CACHE Curtis, Allen
2003-05-09 18:28 ` Roland Dreier
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2003-05-09 19:54 Curtis, Allen
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