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IB/core: Introduce rdma_user_mmap_entry_insert_range() API 

Introduce rdma_user_mmap_entry_insert_range() API to be used once the
required key for the given entry should be in a given range.

Signed-off-by: Yishai Hadas <yishaih@mellanox.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Link: https://lore.kernel.org/r/20191212100237.330654-2-leon@kernel.org
Signed-off-by: Doug Ledford <dledford@redhat.com>
This commit is contained in:
Yishai Hadas 2019-12-12 12:02:36 +02:00 committed by Doug Ledford
parent ed9085fed9
commit 7a763d18ff
2 changed files with 44 additions and 9 deletions
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48
drivers/infiniband/core/ib_core_uverbs.c
View File

@ -238,28 +238,32 @@ void rdma_user_mmap_entry_remove(struct rdma_user_mmap_entry *entry)
EXPORT_SYMBOL(rdma_user_mmap_entry_remove);
/**
* rdma_user_mmap_entry_insert() - Insert an entry to the mmap_xa
* rdma_user_mmap_entry_insert_range() - Insert an entry to the mmap_xa
* in a given range.
*
* @ucontext: associated user context.
* @entry: the entry to insert into the mmap_xa
* @length: length of the address that will be mmapped
* @min_pgoff: minimum pgoff to be returned
* @max_pgoff: maximum pgoff to be returned
*
* This function should be called by drivers that use the rdma_user_mmap
* interface for implementing their mmap syscall A database of mmap offsets is
* handled in the core and helper functions are provided to insert entries
* into the database and extract entries when the user calls mmap with the
* given offset. The function allocates a unique page offset that should be
* provided to user, the user will use the offset to retrieve information such
* as address to be mapped and how.
* given offset. The function allocates a unique page offset in a given range
* that should be provided to user, the user will use the offset to retrieve
* information such as address to be mapped and how.
*
* Return: 0 on success and -ENOMEM on failure
*/
int rdma_user_mmap_entry_insert(struct ib_ucontext *ucontext,
struct rdma_user_mmap_entry *entry,
size_t length)
int rdma_user_mmap_entry_insert_range(struct ib_ucontext *ucontext,
struct rdma_user_mmap_entry *entry,
size_t length, u32 min_pgoff,
u32 max_pgoff)
{
struct ib_uverbs_file *ufile = ucontext->ufile;
XA_STATE(xas, &ucontext->mmap_xa, 0);
XA_STATE(xas, &ucontext->mmap_xa, min_pgoff);
u32 xa_first, xa_last, npages;
int err;
u32 i;
@ -285,7 +289,7 @@ int rdma_user_mmap_entry_insert(struct ib_ucontext *ucontext,
entry->npages = npages;
while (true) {
/* First find an empty index */
xas_find_marked(&xas, U32_MAX, XA_FREE_MARK);
xas_find_marked(&xas, max_pgoff, XA_FREE_MARK);
if (xas.xa_node == XAS_RESTART)
goto err_unlock;
@ -332,4 +336,30 @@ err_unlock:
mutex_unlock(&ufile->umap_lock);
return -ENOMEM;
}
EXPORT_SYMBOL(rdma_user_mmap_entry_insert_range);
/**
* rdma_user_mmap_entry_insert() - Insert an entry to the mmap_xa.
*
* @ucontext: associated user context.
* @entry: the entry to insert into the mmap_xa
* @length: length of the address that will be mmapped
*
* This function should be called by drivers that use the rdma_user_mmap
* interface for handling user mmapped addresses. The database is handled in
* the core and helper functions are provided to insert entries into the
* database and extract entries when the user calls mmap with the given offset.
* The function allocates a unique page offset that should be provided to user,
* the user will use the offset to retrieve information such as address to
* be mapped and how.
*
* Return: 0 on success and -ENOMEM on failure
*/
int rdma_user_mmap_entry_insert(struct ib_ucontext *ucontext,
struct rdma_user_mmap_entry *entry,
size_t length)
{
return rdma_user_mmap_entry_insert_range(ucontext, entry, length, 0,
U32_MAX);
}
EXPORT_SYMBOL(rdma_user_mmap_entry_insert);

5
include/rdma/ib_verbs.h
View File

@ -2832,6 +2832,11 @@ int rdma_user_mmap_io(struct ib_ucontext *ucontext, struct vm_area_struct *vma,
int rdma_user_mmap_entry_insert(struct ib_ucontext *ucontext,
struct rdma_user_mmap_entry *entry,
size_t length);
int rdma_user_mmap_entry_insert_range(struct ib_ucontext *ucontext,
struct rdma_user_mmap_entry *entry,
size_t length, u32 min_pgoff,
u32 max_pgoff);
struct rdma_user_mmap_entry *
rdma_user_mmap_entry_get_pgoff(struct ib_ucontext *ucontext,
unsigned long pgoff);