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RDMA/odp: Make the three ways to create a umem_odp clear

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The three paths to build the umem_odps are kind of muddled, they are:
- As a normal ib_mr umem
- As a child in an implicit ODP umem tree
- As the root of an implicit ODP umem tree

Only the first two are actually umem's, the last is an abuse.

The implicit case can only be triggered by explicit driver request, it
should never be co-mingled with the normal case. While we are here, make
sensible function names and add some comments to make this clearer.

Link: https://lore.kernel.org/r/20190819111710.18440-6-leon@kernel.org
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
This commit is contained in:
Jason Gunthorpe
2019-08-19 14:17:03 +03:00
parent 22d79c9a91
commit f20bef6a95
3 changed files with 89 additions and 20 deletions
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80
drivers/infiniband/core/umem_odp.c
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@@ -46,6 +46,8 @@
#include <rdma/ib_umem.h>
#include <rdma/ib_umem_odp.h>
#include "uverbs.h"
static void ib_umem_notifier_start_account(struct ib_umem_odp *umem_odp)
{
mutex_lock(&umem_odp->umem_mutex);
@@ -344,8 +346,67 @@ out_page_list:
return ret;
}
struct ib_umem_odp *ib_alloc_odp_umem(struct ib_umem_odp *root,
unsigned long addr, size_t size)
/**
* ib_umem_odp_alloc_implicit - Allocate a parent implicit ODP umem
*
* Implicit ODP umems do not have a VA range and do not have any page lists.
* They exist only to hold the per_mm reference to help the driver create
* children umems.
*
* @udata: udata from the syscall being used to create the umem
* @access: ib_reg_mr access flags
*/
struct ib_umem_odp *ib_umem_odp_alloc_implicit(struct ib_udata *udata,
int access)
{
struct ib_ucontext *context =
container_of(udata, struct uverbs_attr_bundle, driver_udata)
->context;
struct ib_umem *umem;
struct ib_umem_odp *umem_odp;
int ret;
if (access & IB_ACCESS_HUGETLB)
return ERR_PTR(-EINVAL);
if (!context)
return ERR_PTR(-EIO);
if (WARN_ON_ONCE(!context->invalidate_range))
return ERR_PTR(-EINVAL);
umem_odp = kzalloc(sizeof(*umem_odp), GFP_KERNEL);
if (!umem_odp)
return ERR_PTR(-ENOMEM);
umem = &umem_odp->umem;
umem->context = context;
umem->writable = ib_access_writable(access);
umem->owning_mm = current->mm;
umem_odp->is_implicit_odp = 1;
umem_odp->page_shift = PAGE_SHIFT;
ret = ib_init_umem_odp(umem_odp, NULL);
if (ret) {
kfree(umem_odp);
return ERR_PTR(ret);
}
mmgrab(umem->owning_mm);
return umem_odp;
}
EXPORT_SYMBOL(ib_umem_odp_alloc_implicit);
/**
* ib_umem_odp_alloc_child - Allocate a child ODP umem under an implicit
* parent ODP umem
*
* @root: The parent umem enclosing the child. This must be allocated using
* ib_alloc_implicit_odp_umem()
* @addr: The starting userspace VA
* @size: The length of the userspace VA
*/
struct ib_umem_odp *ib_umem_odp_alloc_child(struct ib_umem_odp *root,
unsigned long addr, size_t size)
{
/*
* Caller must ensure that root cannot be freed during the call to
@@ -355,6 +416,9 @@ struct ib_umem_odp *ib_alloc_odp_umem(struct ib_umem_odp *root,
struct ib_umem *umem;
int ret;
if (WARN_ON(!root->is_implicit_odp))
return ERR_PTR(-EINVAL);
odp_data = kzalloc(sizeof(*odp_data), GFP_KERNEL);
if (!odp_data)
return ERR_PTR(-ENOMEM);
@@ -376,8 +440,15 @@ struct ib_umem_odp *ib_alloc_odp_umem(struct ib_umem_odp *root,
return odp_data;
}
EXPORT_SYMBOL(ib_alloc_odp_umem);
EXPORT_SYMBOL(ib_umem_odp_alloc_child);
/**
* ib_umem_odp_get - Complete ib_umem_get()
*
* @umem_odp: The partially configured umem from ib_umem_get()
* @addr: The starting userspace VA
* @access: ib_reg_mr access flags
*/
int ib_umem_odp_get(struct ib_umem_odp *umem_odp, int access)
{
/*
@@ -386,9 +457,6 @@ int ib_umem_odp_get(struct ib_umem_odp *umem_odp, int access)
*/
struct mm_struct *mm = umem_odp->umem.owning_mm;
if (umem_odp->umem.address == 0 && umem_odp->umem.length == 0)
umem_odp->is_implicit_odp = 1;
umem_odp->page_shift = PAGE_SHIFT;
if (access & IB_ACCESS_HUGETLB) {
struct vm_area_struct *vma;