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authorRoland Dreier <rdreier@cisco.com>2009-03-30 08:31:05 -0700
committerRoland Dreier <rolandd@cisco.com>2009-03-30 08:31:05 -0700
commite1d60ec6699f19b760df8261e922ae236ea7bb31 (patch)
tree6a28185f550d78bf36cf5b7e7d411f204d0a2ad1
parent5d80f8e5a9dc9c9a94d4aeaa567e219a808b8a4a (diff)
IB/mlx4: Use pgprot_writecombine() for BlueFlame pages
The PAT work on x86 has finally made pgprot_writecombine() a usable API for modular drivers. As the comment indicates, this is exactly what we want to use in mlx4_ib to map BlueFlame pages up to userspace, since using WC for these pages improves small message latency significantly. Signed-off-by: Roland Dreier <rolandd@cisco.com>
-rw-r--r--drivers/infiniband/hw/mlx4/main.c3
1 files changed, 1 insertions, 2 deletions
diff --git a/drivers/infiniband/hw/mlx4/main.c b/drivers/infiniband/hw/mlx4/main.c
index 2ccb9d31771f..ae3d7590346e 100644
--- a/drivers/infiniband/hw/mlx4/main.c
+++ b/drivers/infiniband/hw/mlx4/main.c
@@ -394,8 +394,7 @@ static int mlx4_ib_mmap(struct ib_ucontext *context, struct vm_area_struct *vma)
PAGE_SIZE, vma->vm_page_prot))
return -EAGAIN;
} else if (vma->vm_pgoff == 1 && dev->dev->caps.bf_reg_size != 0) {
- /* FIXME want pgprot_writecombine() for BlueFlame pages */
- vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
+ vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
if (io_remap_pfn_range(vma, vma->vm_start,
to_mucontext(context)->uar.pfn +