On 7/29/10 11:25 AM, Tom Tucker wrote:
From: Tom Tucker<[email protected]>
Add an ib_iomem_get service that converts a vma to an array of
physical addresses. This makes it easier for each device driver to
add support for the reg_io_mr provider method.
Signed-off-by: Tom Tucker<[email protected]>
---
drivers/infiniband/core/umem.c | 248 ++++++++++++++++++++++++++++++++++++++--
include/rdma/ib_umem.h | 14 ++
2 files changed, 251 insertions(+), 11 deletions(-)
[...snip...]
+ /* The pfn_list we built is a set of Page
+ * Frame Numbers (PFN) whose physical address
+ * is PFN<< PAGE_SHIFT. The SG DMA mapping
+ * services expect page addresses, not PFN,
+ * therefore, we have to do the dma mapping
+ * ourselves here. */
+ for (i = 0; i< chunk->nents; ++i) {
+ sg_set_page(&chunk->page_list[i], 0,
+ PAGE_SIZE, 0);
+ chunk->page_list[i].dma_address =
+ (pfn_list[i]<< PAGE_SHIFT);
This is not architecture independent. Does anyone have any thoughts on
how this ought to be done?
+ chunk->page_list[i].dma_length = PAGE_SIZE;
+ }
+ chunk->nmap = chunk->nents;
+ ret -= chunk->nents;
+ off += chunk->nents;
+ list_add_tail(&chunk->list,&umem->chunk_list);
+ }
+
+ ret = 0;
+ }
+
[...snip...]
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