| To: | Thomas Bogendoerfer <tsbogend@alpha.franken.de> |
|---|---|
| Subject: | Re: [PATCH][MIPS] add DMA declare coherent memory support |
| From: | Yuasa Yoichi <yoichi_yuasa@tripeaks.co.jp> |
| Date: | Fri, 5 Jun 2009 12:03:01 +0900 |
| Cc: | Ralf Baechle <ralf@linux-mips.org>, linux-mips <linux-mips@linux-mips.org> |
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| In-reply-to: | <20090603153151.GA4009@alpha.franken.de> |
| Original-recipient: | rfc822;linux-mips@linux-mips.org |
| References: | <20090604001604.9ced2997.yoichi_yuasa@tripeaks.co.jp> <20090603153151.GA4009@alpha.franken.de> |
| Sender: | linux-mips-bounce@linux-mips.org |
Hi, 2009/6/4 Thomas Bogendoerfer <tsbogend@alpha.franken.de>: > On Thu, Jun 04, 2009 at 12:16:04AM +0900, Yoichi Yuasa wrote: >> >> Signed-off-by: Yoichi Yuasa <yoichi_yuasa@tripeaks.co.jp> > > a little bit more description what this is all about would be quite > helpful. I also see a problem as there is at least one MIPS machine > (SGI IP28), which doesn't support coherent memory (at least not without > playing dirty games with the memory controller, which in return makes > the machine slow). Some drivers require dma_declare_coherent_memory() (eg. drivers/usb/host/ohci-sm501.c). It is used to driver's local memory allocation with dma_alloc_coherent(). Yoichi |
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