Messages in this thread | | | Subject | [BK PATCH] on-chip coherent memory API for DMA | From | James Bottomley <> | Date | 06 Jul 2004 18:14:35 -0500 |
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This is a rollup of the previous patch I sent to the list for the on-chip API. It's available at
bk://linux-voyager.bkbits.net/dma-declare-coherent-memory-2.6
I split the patches I sent up into the five separate areas that they affect:
ChangeSet@1.1783, 2004-06-30 21:44:24-05:00, jejb@mulgrave.(none) Convert NCR_Q720 to use dma_declare_coherent_memory
This board makes an ideal example for using the API since it consists of 4 SCSI I/O processors and a 0.5-2MB block of memory on a single MCA card.
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
ChangeSet@1.1782, 2004-06-30 21:38:34-05:00, jejb@mulgrave.(none) Add x86 implementation of dma_declare_coherent_memory
This actually implements the API (all except for DMA_MEMORY_INCLUDES_CHILDREN).
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
ChangeSet@1.1781, 2004-06-30 21:11:14-05:00, jejb@mulgrave.(none) Add vmalloc alignment constraints
vmalloc is used by ioremap() to get regions for remapping I/O space. To feed these regions back into a __get_free_pages() type memory allocator, they are expected to have more alignment than get_vm_area() proves. So add additional alignment constraints for VM_IOREMAP.
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
ChangeSet@1.1780, 2004-06-30 21:08:15-05:00, jejb@mulgrave.(none) Add memory region bitmap implementations
These APIs deal with bitmaps representing contiguous memory regions. The idea is to set, free and find a contiguous area.
For ease of implementation (as well as to conform to the standard requirements), the bitmaps always return n aligned n length regions. The implementation is also limited to BITS_PER_LONG contiguous regions.
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
ChangeSet@1.1779, 2004-06-30 21:02:11-05:00, jejb@mulgrave.(none) Add dma_declare_coherent_memory() API
This adds the description and a null prototype.
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
And the diffstat is:
Documentation/DMA-API.txt | 79 +++++++++++++++++++++++++++++ arch/i386/kernel/pci-dma.c | 111 ++++++++++++++++++++++++++++++++++++++++- drivers/scsi/NCR_Q720.c | 21 ++++++- include/asm-i386/dma-mapping.h | 12 ++++ include/linux/bitmap.h | 3 + include/linux/device.h | 3 + include/linux/dma-mapping.h | 26 +++++++++ lib/bitmap.c | 76 ++++++++++++++++++++++++++++ mm/vmalloc.c | 20 ++++++- 9 files changed, 344 insertions(+), 7 deletions(-)
James
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