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IB/umem: Update on demand page (ODP) support

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Currently ODP MR may explicitly register virtual address space area
of limited length.
This change allows MR to cover entire process virtual address space
dynamicaly adding/removing translation entries to device MTT.

Add following changes to support implicit MR:
* Allow umem to be zero size to back-up implicit MR.
* Add new function ib_alloc_odp_umem() to add virtual memory regions
  to implicit MR dynamically on demand.
* Add new function rbt_ib_umem_lookup() to find dynamically added
  virtual memory regions.
* Expose function rbt_ib_umem_for_each_in_range() to other modules and
  make it safe

Signed-off-by: Artemy Kovalyov <artemyko@mellanox.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Doug Ledford <dledford@redhat.com>
This commit is contained in:
Artemy Kovalyov 2017-01-18 16:58:07 +02:00 committed by Doug Ledford
parent 25bf14d6f5
commit d07d1d70ce
4 changed files with 113 additions and 19 deletions
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3
drivers/infiniband/core/umem.c
View File

@ -99,9 +99,6 @@ struct ib_umem *ib_umem_get(struct ib_ucontext *context, unsigned long addr,
if (dmasync)
dma_attrs |= DMA_ATTR_WRITE_BARRIER;
if (!size)
return ERR_PTR(-EINVAL);
/*
* If the combination of the addr and size requested for this memory
* region causes an integer overflow, return error.

69
drivers/infiniband/core/umem_odp.c
View File

@ -239,6 +239,71 @@ static const struct mmu_notifier_ops ib_umem_notifiers = {
.invalidate_range_end = ib_umem_notifier_invalidate_range_end,
};
struct ib_umem *ib_alloc_odp_umem(struct ib_ucontext *context,
unsigned long addr,
size_t size)
{
struct ib_umem *umem;
struct ib_umem_odp *odp_data;
int pages = size >> PAGE_SHIFT;
int ret;
umem = kzalloc(sizeof(*umem), GFP_KERNEL);
if (!umem)
return ERR_PTR(-ENOMEM);
umem->context = context;
umem->length = size;
umem->address = addr;
umem->page_size = PAGE_SIZE;
umem->writable = 1;
odp_data = kzalloc(sizeof(*odp_data), GFP_KERNEL);
if (!odp_data) {
ret = -ENOMEM;
goto out_umem;
}
odp_data->umem = umem;
mutex_init(&odp_data->umem_mutex);
init_completion(&odp_data->notifier_completion);
odp_data->page_list = vzalloc(pages * sizeof(*odp_data->page_list));
if (!odp_data->page_list) {
ret = -ENOMEM;
goto out_odp_data;
}
odp_data->dma_list = vzalloc(pages * sizeof(*odp_data->dma_list));
if (!odp_data->dma_list) {
ret = -ENOMEM;
goto out_page_list;
}
down_write(&context->umem_rwsem);
context->odp_mrs_count++;
rbt_ib_umem_insert(&odp_data->interval_tree, &context->umem_tree);
if (likely(!atomic_read(&context->notifier_count)))
odp_data->mn_counters_active = true;
else
list_add(&odp_data->no_private_counters,
&context->no_private_counters);
up_write(&context->umem_rwsem);
umem->odp_data = odp_data;
return umem;
out_page_list:
vfree(odp_data->page_list);
out_odp_data:
kfree(odp_data);
out_umem:
kfree(umem);
return ERR_PTR(ret);
}
EXPORT_SYMBOL(ib_alloc_odp_umem);
int ib_umem_odp_get(struct ib_ucontext *context, struct ib_umem *umem)
{
int ret_val;
@ -270,6 +335,7 @@ int ib_umem_odp_get(struct ib_ucontext *context, struct ib_umem *umem)
init_completion(&umem->odp_data->notifier_completion);
if (ib_umem_num_pages(umem)) {
umem->odp_data->page_list = vzalloc(ib_umem_num_pages(umem) *
sizeof(*umem->odp_data->page_list));
if (!umem->odp_data->page_list) {
@ -283,6 +349,7 @@ int ib_umem_odp_get(struct ib_ucontext *context, struct ib_umem *umem)
ret_val = -ENOMEM;
goto out_page_list;
}
}
/*
* When using MMU notifiers, we will get a
@ -466,6 +533,7 @@ static int ib_umem_odp_map_dma_single_page(
}
umem->odp_data->dma_list[page_index] = dma_addr | access_mask;
umem->odp_data->page_list[page_index] = page;
umem->npages++;
stored_page = 1;
} else if (umem->odp_data->page_list[page_index] == page) {
umem->odp_data->dma_list[page_index] |= access_mask;
@ -665,6 +733,7 @@ void ib_umem_odp_unmap_dma_pages(struct ib_umem *umem, u64 virt,
put_page(page);
umem->odp_data->page_list[idx] = NULL;
umem->odp_data->dma_list[idx] = 0;
umem->npages--;
}
}
mutex_unlock(&umem->odp_data->umem_mutex);

21
drivers/infiniband/core/umem_rbtree.c
View File

@ -78,17 +78,32 @@ int rbt_ib_umem_for_each_in_range(struct rb_root *root,
void *cookie)
{
int ret_val = 0;
struct umem_odp_node *node;
struct umem_odp_node *node, *next;
struct ib_umem_odp *umem;
if (unlikely(start == last))
return ret_val;
for (node = rbt_ib_umem_iter_first(root, start, last - 1); node;
node = rbt_ib_umem_iter_next(node, start, last - 1)) {
for (node = rbt_ib_umem_iter_first(root, start, last - 1);
node; node = next) {
next = rbt_ib_umem_iter_next(node, start, last - 1);
umem = container_of(node, struct ib_umem_odp, interval_tree);
ret_val = cb(umem->umem, start, last, cookie) || ret_val;
}
return ret_val;
}
EXPORT_SYMBOL(rbt_ib_umem_for_each_in_range);
struct ib_umem_odp *rbt_ib_umem_lookup(struct rb_root *root,
u64 addr, u64 length)
{
struct umem_odp_node *node;
node = rbt_ib_umem_iter_first(root, addr, addr + length - 1);
if (node)
return container_of(node, struct ib_umem_odp, interval_tree);
return NULL;
}
EXPORT_SYMBOL(rbt_ib_umem_lookup);

21
include/rdma/ib_umem_odp.h
View File

@ -79,11 +79,15 @@ struct ib_umem_odp {
struct completion notifier_completion;
int dying;
struct work_struct work;
};
#ifdef CONFIG_INFINIBAND_ON_DEMAND_PAGING
int ib_umem_odp_get(struct ib_ucontext *context, struct ib_umem *umem);
struct ib_umem *ib_alloc_odp_umem(struct ib_ucontext *context,
unsigned long addr,
size_t size);
void ib_umem_odp_release(struct ib_umem *umem);
@ -117,10 +121,12 @@ typedef int (*umem_call_back)(struct ib_umem *item, u64 start, u64 end,
int rbt_ib_umem_for_each_in_range(struct rb_root *root, u64 start, u64 end,
umem_call_back cb, void *cookie);
struct umem_odp_node *rbt_ib_umem_iter_first(struct rb_root *root,
u64 start, u64 last);
struct umem_odp_node *rbt_ib_umem_iter_next(struct umem_odp_node *node,
u64 start, u64 last);
/*
* Find first region intersecting with address range.
* Return NULL if not found
*/
struct ib_umem_odp *rbt_ib_umem_lookup(struct rb_root *root,
u64 addr, u64 length);
static inline int ib_umem_mmu_notifier_retry(struct ib_umem *item,
unsigned long mmu_seq)
@ -153,6 +159,13 @@ static inline int ib_umem_odp_get(struct ib_ucontext *context,
return -EINVAL;
}
static inline struct ib_umem *ib_alloc_odp_umem(struct ib_ucontext *context,
unsigned long addr,
size_t size)
{
return ERR_PTR(-EINVAL);
}
static inline void ib_umem_odp_release(struct ib_umem *umem) {}
#endif /* CONFIG_INFINIBAND_ON_DEMAND_PAGING */