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[PATCH] IB uverbs: add mthca mmap support 

Add support for mmap() method to mthca, so that userspace can get access to
doorbell registers.  This allows userspace to get direct access to the HCA for
data path operations.

Each userspace context gets its own copy of the doorbell registers and is only
allowed to use resources that the kernel has given it access to.  In other
words, this is safe.

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 17:57:17 -07:00 committed by Linus Torvalds
parent 5e0b537c7d
commit 53b8b3ffd5
1 changed files with 18 additions and 0 deletions
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18
drivers/infiniband/hw/mthca/mthca_provider.c
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@ -35,6 +35,7 @@
*/
#include <ib_smi.h>
#include <linux/mm.h>
#include "mthca_dev.h"
#include "mthca_cmd.h"
@ -340,6 +341,22 @@ static int mthca_dealloc_ucontext(struct ib_ucontext *context)
return 0;
}
static int mthca_mmap_uar(struct ib_ucontext *context,
struct vm_area_struct *vma)
{
if (vma->vm_end - vma->vm_start != PAGE_SIZE)
return -EINVAL;
vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
if (remap_pfn_range(vma, vma->vm_start,
to_mucontext(context)->uar.pfn,
PAGE_SIZE, vma->vm_page_prot))
return -EAGAIN;
return 0;
}
static struct ib_pd *mthca_alloc_pd(struct ib_device *ibdev,
struct ib_ucontext *context,
struct ib_udata *udata)
@ -766,6 +783,7 @@ int mthca_register_device(struct mthca_dev *dev)
dev->ib_dev.query_gid = mthca_query_gid;
dev->ib_dev.alloc_ucontext = mthca_alloc_ucontext;
dev->ib_dev.dealloc_ucontext = mthca_dealloc_ucontext;
dev->ib_dev.mmap = mthca_mmap_uar;
dev->ib_dev.alloc_pd = mthca_alloc_pd;
dev->ib_dev.dealloc_pd = mthca_dealloc_pd;
dev->ib_dev.create_ah = mthca_ah_create;