tree 9cc09804e388e8febba6fd8d565dfdd633efe04b
parent 5e0b537c7d94efe3fea0fee8e2533c3231a8af75
author Roland Dreier <[EMAIL PROTECTED]> Fri, 08 Jul 2005 07:57:17 -0700
committer Linus Torvalds <[EMAIL PROTECTED]> Fri, 08 Jul 2005 08:23:49 -0700
[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 <[EMAIL PROTECTED]>
Signed-off-by: Andrew Morton <[EMAIL PROTECTED]>
Signed-off-by: Linus Torvalds <[EMAIL PROTECTED]>
drivers/infiniband/hw/mthca/mthca_provider.c | 18 ++++++++++++++++++
1 files changed, 18 insertions(+)
diff --git a/drivers/infiniband/hw/mthca/mthca_provider.c
b/drivers/infiniband/hw/mthca/mthca_provider.c
--- a/drivers/infiniband/hw/mthca/mthca_provider.c
+++ b/drivers/infiniband/hw/mthca/mthca_provider.c
@@ -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
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_d
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;
-
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