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[PATCH] IB uverbs: add mthca user MR support 

Add support for userspace memory regions (MRs) to mthca.

Signed-off-by: Roland Dreier <rolandd@cisco.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Roland Dreier 2005-07-07 17:57:19 -07:00 committed by Linus Torvalds
parent 99264c1ee2
commit 24d4281be0
1 changed files with 82 additions and 0 deletions
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82
drivers/infiniband/hw/mthca/mthca_provider.c
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@ -654,6 +654,87 @@ static struct ib_mr *mthca_reg_phys_mr(struct ib_pd *pd,
return &mr->ibmr;
}
static struct ib_mr *mthca_reg_user_mr(struct ib_pd *pd, struct ib_umem *region,
int acc, struct ib_udata *udata)
{
struct mthca_dev *dev = to_mdev(pd->device);
struct ib_umem_chunk *chunk;
struct mthca_mr *mr;
u64 *pages;
int shift, n, len;
int i, j, k;
int err = 0;
shift = ffs(region->page_size) - 1;
mr = kmalloc(sizeof *mr, GFP_KERNEL);
if (!mr)
return ERR_PTR(-ENOMEM);
n = 0;
list_for_each_entry(chunk, &region->chunk_list, list)
n += chunk->nents;
mr->mtt = mthca_alloc_mtt(dev, n);
if (IS_ERR(mr->mtt)) {
err = PTR_ERR(mr->mtt);
goto err;
}
pages = (u64 *) __get_free_page(GFP_KERNEL);
if (!pages) {
err = -ENOMEM;
goto err_mtt;
}
i = n = 0;
list_for_each_entry(chunk, &region->chunk_list, list)
for (j = 0; j < chunk->nmap; ++j) {
len = sg_dma_len(&chunk->page_list[j]) >> shift;
for (k = 0; k < len; ++k) {
pages[i++] = sg_dma_address(&chunk->page_list[j]) +
region->page_size * k;
/*
* Be friendly to WRITE_MTT command
* and leave two empty slots for the
* index and reserved fields of the
* mailbox.
*/
if (i == PAGE_SIZE / sizeof (u64) - 2) {
err = mthca_write_mtt(dev, mr->mtt,
n, pages, i);
if (err)
goto mtt_done;
n += i;
i = 0;
}
}
}
if (i)
err = mthca_write_mtt(dev, mr->mtt, n, pages, i);
mtt_done:
free_page((unsigned long) pages);
if (err)
goto err_mtt;
err = mthca_mr_alloc(dev, to_mpd(pd)->pd_num, shift, region->virt_base,
region->length, convert_access(acc), mr);
if (err)
goto err_mtt;
return &mr->ibmr;
err_mtt:
mthca_free_mtt(dev, mr->mtt);
err:
kfree(mr);
return ERR_PTR(err);
}
static int mthca_dereg_mr(struct ib_mr *mr)
{
struct mthca_mr *mmr = to_mmr(mr);
@ -804,6 +885,7 @@ int mthca_register_device(struct mthca_dev *dev)
dev->ib_dev.poll_cq = mthca_poll_cq;
dev->ib_dev.get_dma_mr = mthca_get_dma_mr;
dev->ib_dev.reg_phys_mr = mthca_reg_phys_mr;
dev->ib_dev.reg_user_mr = mthca_reg_user_mr;
dev->ib_dev.dereg_mr = mthca_dereg_mr;
if (dev->mthca_flags & MTHCA_FLAG_FMR) {