summaryrefslogtreecommitdiff
path: root/drivers/infiniband/hw/cxgb4/provider.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/infiniband/hw/cxgb4/provider.c')
-rw-r--r--drivers/infiniband/hw/cxgb4/provider.c45
1 files changed, 43 insertions, 2 deletions
diff --git a/drivers/infiniband/hw/cxgb4/provider.c b/drivers/infiniband/hw/cxgb4/provider.c
index 7e94c9a656a1..79429256023a 100644
--- a/drivers/infiniband/hw/cxgb4/provider.c
+++ b/drivers/infiniband/hw/cxgb4/provider.c
@@ -106,15 +106,56 @@ static struct ib_ucontext *c4iw_alloc_ucontext(struct ib_device *ibdev,
{
struct c4iw_ucontext *context;
struct c4iw_dev *rhp = to_c4iw_dev(ibdev);
+ static int warned;
+ struct c4iw_alloc_ucontext_resp uresp;
+ int ret = 0;
+ struct c4iw_mm_entry *mm = NULL;
PDBG("%s ibdev %p\n", __func__, ibdev);
context = kzalloc(sizeof(*context), GFP_KERNEL);
- if (!context)
- return ERR_PTR(-ENOMEM);
+ if (!context) {
+ ret = -ENOMEM;
+ goto err;
+ }
+
c4iw_init_dev_ucontext(&rhp->rdev, &context->uctx);
INIT_LIST_HEAD(&context->mmaps);
spin_lock_init(&context->mmap_lock);
+
+ if (udata->outlen < sizeof(uresp)) {
+ if (!warned++)
+ pr_err(MOD "Warning - downlevel libcxgb4 (non-fatal), device status page disabled.");
+ rhp->rdev.flags |= T4_STATUS_PAGE_DISABLED;
+ } else {
+ mm = kmalloc(sizeof(*mm), GFP_KERNEL);
+ if (!mm) {
+ ret = -ENOMEM;
+ goto err_free;
+ }
+
+ uresp.status_page_size = PAGE_SIZE;
+
+ spin_lock(&context->mmap_lock);
+ uresp.status_page_key = context->key;
+ context->key += PAGE_SIZE;
+ spin_unlock(&context->mmap_lock);
+
+ ret = ib_copy_to_udata(udata, &uresp, sizeof(uresp));
+ if (ret)
+ goto err_mm;
+
+ mm->key = uresp.status_page_key;
+ mm->addr = virt_to_phys(rhp->rdev.status_page);
+ mm->len = PAGE_SIZE;
+ insert_mmap(context, mm);
+ }
return &context->ibucontext;
+err_mm:
+ kfree(mm);
+err_free:
+ kfree(context);
+err:
+ return ERR_PTR(ret);
}
static int c4iw_mmap(struct ib_ucontext *context, struct vm_area_struct *vma)