From: Armin Kuster <akuster@mvista•com>
To: ppcdevel <linuxppc-dev@lists•linuxppc.org>,
ppclists <Majordomo@lists•linuxppc.org>
Subject: New API for non cache coherent ppc cpu's
Date: Tue, 20 Nov 2001 12:13:20 -0800 [thread overview]
Message-ID: <3BFAB960.DAA72239@mvista.com> (raw)
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To all NOT_COHERENT_CACHE users
About a month ago a new API made its way into the ppc,
consistent_sync_page. For CONFIG_NOT_COHERENT_CACHE processors,
requires
proper flushing of the page being used. Please review and provide feed
back
-- armin
sample from patch
void consistent_sync_page(struct page *page, unsigned long offset,
size_t size, int direction)
{
unsigned long start = (unsigned long)page->virtual;
unsigned long end = start + size;
switch (direction) {
case PCI_DMA_NONE:
BUG();
case PCI_DMA_FROMDEVICE: /* invalidate only */
invalidate_dcache_range(start, end);
break;
case PCI_DMA_TODEVICE: /* writeback only */
clean_dcache_range(start, end);
break;
case PCI_DMA_BIDIRECTIONAL: /* writeback and invalidate */
flush_dcache_range(start, end);
break;
}
}
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next reply other threads:[~2001-11-20 20:13 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-11-20 20:13 Armin Kuster [this message]
2001-11-21 11:15 ` New API for non cache coherent ppc cpu's Roman Zippel
2001-11-21 18:29 ` Armin Kuster
2001-11-21 20:20 ` Roman Zippel
2001-11-22 20:57 ` Paul Mackerras
2001-11-22 23:07 ` Dan Malek
2001-11-22 23:54 ` Roman Zippel
2001-11-23 1:32 ` Paul Mackerras
2001-11-23 16:08 ` Dan Malek
2001-11-22 23:50 ` Roman Zippel
2001-11-23 1:09 ` Paul Mackerras
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