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IB/ehca: Only use MR large pages for hugetlb regions

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...because, on virtualized hardware like System p, we can't be sure
that the physical pages behind them are contiguous otherwise.

Signed-off-by: Joachim Fenkes <fenkes@de.ibm.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>
This commit is contained in:
Joachim Fenkes 2007-09-13 18:16:20 +02:00 committed by Roland Dreier
parent c8d8beea03
commit 3a31c41901
1 changed files with 15 additions and 10 deletions
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25
drivers/infiniband/hw/ehca/ehca_mrmw.c
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@ -51,6 +51,7 @@
#define NUM_CHUNKS(length, chunk_size) \
(((length) + (chunk_size - 1)) / (chunk_size))
/* max number of rpages (per hcall register_rpages) */
#define MAX_RPAGES 512
@ -64,6 +65,11 @@ enum ehca_mr_pgsize {
EHCA_MR_PGSIZE16M = 0x1000000L
};
#define EHCA_MR_PGSHIFT4K 12
#define EHCA_MR_PGSHIFT64K 16
#define EHCA_MR_PGSHIFT1M 20
#define EHCA_MR_PGSHIFT16M 24
static u32 ehca_encode_hwpage_size(u32 pgsize)
{
u32 idx = 0;
@ -347,17 +353,16 @@ struct ib_mr *ehca_reg_user_mr(struct ib_pd *pd, u64 start, u64 length,
/* select proper hw_pgsize */
if (ehca_mr_largepage &&
(shca->hca_cap_mr_pgsize & HCA_CAP_MR_PGSIZE_16M)) {
if (length <= EHCA_MR_PGSIZE4K
&& PAGE_SIZE == EHCA_MR_PGSIZE4K)
hwpage_size = EHCA_MR_PGSIZE4K;
else if (length <= EHCA_MR_PGSIZE64K)
hwpage_size = EHCA_MR_PGSIZE64K;
else if (length <= EHCA_MR_PGSIZE1M)
hwpage_size = EHCA_MR_PGSIZE1M;
else
hwpage_size = EHCA_MR_PGSIZE16M;
int page_shift = PAGE_SHIFT;
if (e_mr->umem->hugetlb) {
/* determine page_shift, clamp between 4K and 16M */
page_shift = (fls64(length - 1) + 3) & ~3;
page_shift = min(max(page_shift, EHCA_MR_PGSHIFT4K),
EHCA_MR_PGSHIFT16M);
}
hwpage_size = 1UL << page_shift;
} else
hwpage_size = EHCA_MR_PGSIZE4K;
hwpage_size = EHCA_MR_PGSIZE4K; /* ehca1 only supports 4k */
ehca_dbg(pd->device, "hwpage_size=%lx", hwpage_size);
reg_user_mr_fallback: