7c963ad1d1
Firstly, if the direction is TODEVICE, then dirty data in the streaming cache is impossible so we can elide the flush-flag synchronization in that case. Next, the context allocator is broken. It is highly likely that contexts get used multiple times for different dma mappings, which confuses the strbuf flushing code and makes it run inefficiently. Signed-off-by: David S. Miller <davem@davemloft.net>
21 lines
974 B
C
21 lines
974 B
C
/* $Id: iommu.h,v 1.10 2001/03/08 09:55:56 davem Exp $
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* iommu.h: Definitions for the sun5 IOMMU.
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*
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* Copyright (C) 1996, 1999 David S. Miller (davem@caip.rutgers.edu)
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*/
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#ifndef _SPARC64_IOMMU_H
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#define _SPARC64_IOMMU_H
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/* The format of an iopte in the page tables. */
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#define IOPTE_VALID 0x8000000000000000UL /* IOPTE is valid */
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#define IOPTE_64K 0x2000000000000000UL /* IOPTE is for 64k page */
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#define IOPTE_STBUF 0x1000000000000000UL /* DVMA can use streaming buffer */
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#define IOPTE_INTRA 0x0800000000000000UL /* SBUS slot-->slot direct transfer*/
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#define IOPTE_CONTEXT 0x07ff800000000000UL /* Context number */
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#define IOPTE_PAGE 0x00007fffffffe000UL /* Physical page number (PA[42:13])*/
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#define IOPTE_CACHE 0x0000000000000010UL /* Cached (in UPA E-cache) */
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#define IOPTE_WRITE 0x0000000000000002UL /* Writeable */
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#define IOMMU_NUM_CTXS 4096
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#endif /* !(_SPARC_IOMMU_H) */
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