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From: Scott Long <scottl@FreeBSD.org>
Date: Tue, 28 Jan 2003 23:25:27 -0800 (PST)
To: cvs-committers@FreeBSD.org, cvs-all@FreeBSD.org
Subject: cvs commit: src/sys/i386/i386 busdma_machdep.c src/sys/i386/include
         bus_dma.h src/sys/alpha/alpha busdma_machdep.c
         src/sys/alpha/include bus.h src/sys/sparc64/include bus.h
         iommuvar.h src/sys/sparc64/pci psycho.c src/sys/sparc64/sbus ...
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scottl      2003/01/28 23:25:27 PST

  Modified files:
    sys/i386/i386        busdma_machdep.c 
    sys/i386/include     bus_dma.h 
    sys/alpha/alpha      busdma_machdep.c 
    sys/alpha/include    bus.h 
    sys/sparc64/include  bus.h iommuvar.h 
    sys/sparc64/pci      psycho.c 
    sys/sparc64/sbus     sbus.c 
    sys/sparc64/sparc64  bus_machdep.c iommu.c 
  Log:
  Implement bus_dmamem_alloc_size() and bus_dmamem_free_size() as
  counterparts to bus_dmamem_alloc() and bus_dmamem_free().  This allows
  the caller to specify the size of the allocation instead of it defaulting
  to the max_size field of the busdma tag.
  
  This is intended to aid in converting drivers to busdma.  Lots of
  hardware cannot understand scatter/gather lists, which forces the
  driver to copy the i/o buffers to a single contiguous region
  before sending it to the hardware.  Without these new methods, this
  would require a new busdma tag for each operation, or a complex
  internal allocator/cache for each driver.
  
  Allocations greater than PAGE_SIZE are rounded up to the next
  PAGE_SIZE by contigmalloc(), so this is not suitable for multiple
  static allocations that would be better served by a single
  fixed-length subdivided allocation.
  
  Reviewed by:    jake (sparc64)
  
  Revision  Changes    Path
  1.26      +26 -8     src/sys/alpha/alpha/busdma_machdep.c
  1.16      +6 -0      src/sys/alpha/include/bus.h
  1.30      +26 -8     src/sys/i386/i386/busdma_machdep.c
  1.17      +6 -0      src/sys/i386/include/bus_dma.h
  1.16      +30 -0     src/sys/sparc64/include/bus.h
  1.8       +4 -0      src/sys/sparc64/include/iommuvar.h
  1.27      +27 -0     src/sys/sparc64/pci/psycho.c
  1.12      +25 -0     src/sys/sparc64/sbus/sbus.c
  1.17      +35 -9     src/sys/sparc64/sparc64/bus_machdep.c
  1.18      +25 -6     src/sys/sparc64/sparc64/iommu.c

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