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path: root/drivers/infiniband/core/uverbs_main.c
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Diffstat (limited to 'drivers/infiniband/core/uverbs_main.c')
-rw-r--r--drivers/infiniband/core/uverbs_main.c88
1 files changed, 14 insertions, 74 deletions
diff --git a/drivers/infiniband/core/uverbs_main.c b/drivers/infiniband/core/uverbs_main.c
index db98111b47f4..970d8e31dd65 100644
--- a/drivers/infiniband/core/uverbs_main.c
+++ b/drivers/infiniband/core/uverbs_main.c
@@ -772,6 +772,8 @@ out_unlock:
return (ret) ? : count;
}
+static const struct vm_operations_struct rdma_umap_ops;
+
static int ib_uverbs_mmap(struct file *filp, struct vm_area_struct *vma)
{
struct ib_uverbs_file *file = filp->private_data;
@@ -785,7 +787,7 @@ static int ib_uverbs_mmap(struct file *filp, struct vm_area_struct *vma)
ret = PTR_ERR(ucontext);
goto out;
}
-
+ vma->vm_ops = &rdma_umap_ops;
ret = ucontext->device->ops.mmap(ucontext, vma);
out:
srcu_read_unlock(&file->device->disassociate_srcu, srcu_key);
@@ -793,38 +795,6 @@ out:
}
/*
- * Each time we map IO memory into user space this keeps track of the mapping.
- * When the device is hot-unplugged we 'zap' the mmaps in user space to point
- * to the zero page and allow the hot unplug to proceed.
- *
- * This is necessary for cases like PCI physical hot unplug as the actual BAR
- * memory may vanish after this and access to it from userspace could MCE.
- *
- * RDMA drivers supporting disassociation must have their user space designed
- * to cope in some way with their IO pages going to the zero page.
- */
-struct rdma_umap_priv {
- struct vm_area_struct *vma;
- struct list_head list;
-};
-
-static const struct vm_operations_struct rdma_umap_ops;
-
-static void rdma_umap_priv_init(struct rdma_umap_priv *priv,
- struct vm_area_struct *vma)
-{
- struct ib_uverbs_file *ufile = vma->vm_file->private_data;
-
- priv->vma = vma;
- vma->vm_private_data = priv;
- vma->vm_ops = &rdma_umap_ops;
-
- mutex_lock(&ufile->umap_lock);
- list_add(&priv->list, &ufile->umaps);
- mutex_unlock(&ufile->umap_lock);
-}
-
-/*
* The VMA has been dup'd, initialize the vm_private_data with a new tracking
* struct
*/
@@ -849,7 +819,7 @@ static void rdma_umap_open(struct vm_area_struct *vma)
priv = kzalloc(sizeof(*priv), GFP_KERNEL);
if (!priv)
goto out_unlock;
- rdma_umap_priv_init(priv, vma);
+ rdma_umap_priv_init(priv, vma, opriv->entry);
up_read(&ufile->hw_destroy_rwsem);
return;
@@ -880,6 +850,9 @@ static void rdma_umap_close(struct vm_area_struct *vma)
* this point.
*/
mutex_lock(&ufile->umap_lock);
+ if (priv->entry)
+ rdma_user_mmap_entry_put(priv->entry);
+
list_del(&priv->list);
mutex_unlock(&ufile->umap_lock);
kfree(priv);
@@ -931,44 +904,6 @@ static const struct vm_operations_struct rdma_umap_ops = {
.fault = rdma_umap_fault,
};
-/*
- * Map IO memory into a process. This is to be called by drivers as part of
- * their mmap() functions if they wish to send something like PCI-E BAR memory
- * to userspace.
- */
-int rdma_user_mmap_io(struct ib_ucontext *ucontext, struct vm_area_struct *vma,
- unsigned long pfn, unsigned long size, pgprot_t prot)
-{
- struct ib_uverbs_file *ufile = ucontext->ufile;
- struct rdma_umap_priv *priv;
-
- if (!(vma->vm_flags & VM_SHARED))
- return -EINVAL;
-
- if (vma->vm_end - vma->vm_start != size)
- return -EINVAL;
-
- /* Driver is using this wrong, must be called by ib_uverbs_mmap */
- if (WARN_ON(!vma->vm_file ||
- vma->vm_file->private_data != ufile))
- return -EINVAL;
- lockdep_assert_held(&ufile->device->disassociate_srcu);
-
- priv = kzalloc(sizeof(*priv), GFP_KERNEL);
- if (!priv)
- return -ENOMEM;
-
- vma->vm_page_prot = prot;
- if (io_remap_pfn_range(vma, vma->vm_start, pfn, size, prot)) {
- kfree(priv);
- return -EAGAIN;
- }
-
- rdma_umap_priv_init(priv, vma);
- return 0;
-}
-EXPORT_SYMBOL(rdma_user_mmap_io);
-
void uverbs_user_mmap_disassociate(struct ib_uverbs_file *ufile)
{
struct rdma_umap_priv *priv, *next_priv;
@@ -1018,6 +953,11 @@ void uverbs_user_mmap_disassociate(struct ib_uverbs_file *ufile)
zap_vma_ptes(vma, vma->vm_start,
vma->vm_end - vma->vm_start);
+
+ if (priv->entry) {
+ rdma_user_mmap_entry_put(priv->entry);
+ priv->entry = NULL;
+ }
}
mutex_unlock(&ufile->umap_lock);
skip_mm:
@@ -1139,7 +1079,7 @@ static const struct file_operations uverbs_fops = {
.release = ib_uverbs_close,
.llseek = no_llseek,
.unlocked_ioctl = ib_uverbs_ioctl,
- .compat_ioctl = ib_uverbs_ioctl,
+ .compat_ioctl = compat_ptr_ioctl,
};
static const struct file_operations uverbs_mmap_fops = {
@@ -1150,7 +1090,7 @@ static const struct file_operations uverbs_mmap_fops = {
.release = ib_uverbs_close,
.llseek = no_llseek,
.unlocked_ioctl = ib_uverbs_ioctl,
- .compat_ioctl = ib_uverbs_ioctl,
+ .compat_ioctl = compat_ptr_ioctl,
};
static int ib_uverbs_get_nl_info(struct ib_device *ibdev, void *client_data,