From: William Jhun <wjhun@ayrnetworks.com>
To: "David S. Miller" <davem@redhat.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: Possible discrepancy regarding streaming DMA mappings in DMA-mapping.txt?
Date: Fri, 24 May 2002 14:18:56 -0700 [thread overview]
Message-ID: <20020524141856.M7205@ayrnetworks.com> (raw)
In-Reply-To: <20020524133711.K7205@ayrnetworks.com> <20020524.132641.104219414.davem@redhat.com> <20020524135842.L7205@ayrnetworks.com> <20020524.135352.131897757.davem@redhat.com>
On Fri, May 24, 2002 at 01:53:52PM -0700, David S. Miller wrote:
> Now that we've established that, you want a new operation.
> That operation is "Re-prepare DMA memory so that PCI realm
> will see it". And the semantics of this would be to, on
> CPUs which are no cache coherent with PCI, to flush the cache
> to prevent inconsistencies between PCI and the CPU.
>
> The CPU cache flush is needed in both cases to/from cases.
>
> So do you finally understand why you must create a new interface
> to accomplish what you want?
Yes, that clears things up. I'll work on this.
Thanks,
William
next prev parent reply other threads:[~2002-05-24 21:20 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-05-23 23:24 Possible discrepancy regarding streaming DMA mappings in DMA-mapping.txt? William Jhun
2002-05-24 5:59 ` David S. Miller
2002-05-24 17:43 ` William Jhun
2002-05-24 17:42 ` David S. Miller
2002-05-24 20:37 ` William Jhun
2002-05-24 20:26 ` David S. Miller
2002-05-24 20:58 ` William Jhun
2002-05-24 20:53 ` David S. Miller
2002-05-24 21:18 ` William Jhun [this message]
2002-05-25 3:41 ` [PATCH] Functions to complement pci_dma_sync_{single,sg}(). (was: Re: Possible discrepancy regarding streaming DMA mappings in DMA-mapping.txt?) William Jhun
2002-05-25 23:04 ` [PATCH] Functions to complement pci_dma_sync_{single,sg}() David S. Miller
2002-05-26 7:09 ` [PATCH] DMA-mapping.txt (was Re: [PATCH] Functions to complement pci_dma_sync_{single,sg}().) William Jhun
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