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RDMA/core: Remove FMR pool API

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This ancient and unsafe method for memory registration is no longer used
by any RDMA based ULP. Remove the FMR pool API from the core driver.

Link: https://lore.kernel.org/r/4-v3-f58e6669d5d3+2cf-fmr_removal_jgg@mellanox.com
Signed-off-by: Max Gurtovoy <maxg@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
This commit is contained in:
Max Gurtovoy 2020-05-28 16:45:46 -03:00 committed by Jason Gunthorpe
parent 07549ee21c
commit 4e373d5417
4 changed files with 1 additions and 591 deletions
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3
Documentation/driver-api/infiniband.rst
View File

@ -37,9 +37,6 @@ InfiniBand core interfaces
.. kernel-doc:: drivers/infiniband/core/ud_header.c
:export:
.. kernel-doc:: drivers/infiniband/core/fmr_pool.c
:export:
.. kernel-doc:: drivers/infiniband/core/umem.c
:export:

2
drivers/infiniband/core/Makefile
View File

@ -8,7 +8,7 @@ obj-$(CONFIG_INFINIBAND_USER_MAD) += ib_umad.o
obj-$(CONFIG_INFINIBAND_USER_ACCESS) += ib_uverbs.o $(user_access-y)
ib_core-y := packer.o ud_header.o verbs.o cq.o rw.o sysfs.o \
device.o fmr_pool.o cache.o netlink.o \
device.o cache.o netlink.o \
roce_gid_mgmt.o mr_pool.o addr.o sa_query.o \
multicast.o mad.o smi.o agent.o mad_rmpp.o \
nldev.o restrack.o counters.o ib_core_uverbs.o \

494
drivers/infiniband/core/fmr_pool.c
View File

@ -1,494 +0,0 @@
/*
* Copyright (c) 2004 Topspin Communications. All rights reserved.
* Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
*
* This software is available to you under a choice of one of two
* licenses. You may choose to be licensed under the terms of the GNU
* General Public License (GPL) Version 2, available from the file
* COPYING in the main directory of this source tree, or the
* OpenIB.org BSD license below:
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* - Redistributions of source code must retain the above
* copyright notice, this list of conditions and the following
* disclaimer.
*
* - Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include <linux/errno.h>
#include <linux/spinlock.h>
#include <linux/export.h>
#include <linux/slab.h>
#include <linux/jhash.h>
#include <linux/kthread.h>
#include <rdma/ib_fmr_pool.h>
#include "core_priv.h"
#define PFX "fmr_pool: "
enum {
IB_FMR_MAX_REMAPS = 32,
IB_FMR_HASH_BITS = 8,
IB_FMR_HASH_SIZE = 1 << IB_FMR_HASH_BITS,
IB_FMR_HASH_MASK = IB_FMR_HASH_SIZE - 1
};
/*
* If an FMR is not in use, then the list member will point to either
* its pool's free_list (if the FMR can be mapped again; that is,
* remap_count < pool->max_remaps) or its pool's dirty_list (if the
* FMR needs to be unmapped before being remapped). In either of
* these cases it is a bug if the ref_count is not 0. In other words,
* if ref_count is > 0, then the list member must not be linked into
* either free_list or dirty_list.
*
* The cache_node member is used to link the FMR into a cache bucket
* (if caching is enabled). This is independent of the reference
* count of the FMR. When a valid FMR is released, its ref_count is
* decremented, and if ref_count reaches 0, the FMR is placed in
* either free_list or dirty_list as appropriate. However, it is not
* removed from the cache and may be "revived" if a call to
* ib_fmr_register_physical() occurs before the FMR is remapped. In
* this case we just increment the ref_count and remove the FMR from
* free_list/dirty_list.
*
* Before we remap an FMR from free_list, we remove it from the cache
* (to prevent another user from obtaining a stale FMR). When an FMR
* is released, we add it to the tail of the free list, so that our
* cache eviction policy is "least recently used."
*
* All manipulation of ref_count, list and cache_node is protected by
* pool_lock to maintain consistency.
*/
struct ib_fmr_pool {
spinlock_t pool_lock;
int pool_size;
int max_pages;
int max_remaps;
int dirty_watermark;
int dirty_len;
struct list_head free_list;
struct list_head dirty_list;
struct hlist_head *cache_bucket;
void (*flush_function)(struct ib_fmr_pool *pool,
void * arg);
void *flush_arg;
struct kthread_worker *worker;
struct kthread_work work;
atomic_t req_ser;
atomic_t flush_ser;
wait_queue_head_t force_wait;
};
static inline u32 ib_fmr_hash(u64 first_page)
{
return jhash_2words((u32) first_page, (u32) (first_page >> 32), 0) &
(IB_FMR_HASH_SIZE - 1);
}
/* Caller must hold pool_lock */
static inline struct ib_pool_fmr *ib_fmr_cache_lookup(struct ib_fmr_pool *pool,
u64 *page_list,
int page_list_len,
u64 io_virtual_address)
{
struct hlist_head *bucket;
struct ib_pool_fmr *fmr;
if (!pool->cache_bucket)
return NULL;
bucket = pool->cache_bucket + ib_fmr_hash(*page_list);
hlist_for_each_entry(fmr, bucket, cache_node)
if (io_virtual_address == fmr->io_virtual_address &&
page_list_len == fmr->page_list_len &&
!memcmp(page_list, fmr->page_list,
page_list_len * sizeof *page_list))
return fmr;
return NULL;
}
static void ib_fmr_batch_release(struct ib_fmr_pool *pool)
{
int ret;
struct ib_pool_fmr *fmr;
LIST_HEAD(unmap_list);
LIST_HEAD(fmr_list);
spin_lock_irq(&pool->pool_lock);
list_for_each_entry(fmr, &pool->dirty_list, list) {
hlist_del_init(&fmr->cache_node);
fmr->remap_count = 0;
list_add_tail(&fmr->fmr->list, &fmr_list);
}
list_splice_init(&pool->dirty_list, &unmap_list);
pool->dirty_len = 0;
spin_unlock_irq(&pool->pool_lock);
if (list_empty(&unmap_list)) {
return;
}
ret = ib_unmap_fmr(&fmr_list);
if (ret)
pr_warn(PFX "ib_unmap_fmr returned %d\n", ret);
spin_lock_irq(&pool->pool_lock);
list_splice(&unmap_list, &pool->free_list);
spin_unlock_irq(&pool->pool_lock);
}
static void ib_fmr_cleanup_func(struct kthread_work *work)
{
struct ib_fmr_pool *pool = container_of(work, struct ib_fmr_pool, work);
ib_fmr_batch_release(pool);
atomic_inc(&pool->flush_ser);
wake_up_interruptible(&pool->force_wait);
if (pool->flush_function)
pool->flush_function(pool, pool->flush_arg);
if (atomic_read(&pool->flush_ser) - atomic_read(&pool->req_ser) < 0)
kthread_queue_work(pool->worker, &pool->work);
}
/**
* ib_create_fmr_pool - Create an FMR pool
* @pd:Protection domain for FMRs
* @params:FMR pool parameters
*
* Create a pool of FMRs. Return value is pointer to new pool or
* error code if creation failed.
*/
struct ib_fmr_pool *ib_create_fmr_pool(struct ib_pd *pd,
struct ib_fmr_pool_param *params)
{
struct ib_device *device;
struct ib_fmr_pool *pool;
int i;
int ret;
int max_remaps;
if (!params)
return ERR_PTR(-EINVAL);
device = pd->device;
if (!device->ops.alloc_fmr || !device->ops.dealloc_fmr ||
!device->ops.map_phys_fmr || !device->ops.unmap_fmr) {
dev_info(&device->dev, "Device does not support FMRs\n");
return ERR_PTR(-ENOSYS);
}
if (!device->attrs.max_map_per_fmr)
max_remaps = IB_FMR_MAX_REMAPS;
else
max_remaps = device->attrs.max_map_per_fmr;
pool = kmalloc(sizeof *pool, GFP_KERNEL);
if (!pool)
return ERR_PTR(-ENOMEM);
pool->cache_bucket = NULL;
pool->flush_function = params->flush_function;
pool->flush_arg = params->flush_arg;
INIT_LIST_HEAD(&pool->free_list);
INIT_LIST_HEAD(&pool->dirty_list);
if (params->cache) {
pool->cache_bucket =
kmalloc_array(IB_FMR_HASH_SIZE,
sizeof(*pool->cache_bucket),
GFP_KERNEL);
if (!pool->cache_bucket) {
ret = -ENOMEM;
goto out_free_pool;
}
for (i = 0; i < IB_FMR_HASH_SIZE; ++i)
INIT_HLIST_HEAD(pool->cache_bucket + i);
}
pool->pool_size = 0;
pool->max_pages = params->max_pages_per_fmr;
pool->max_remaps = max_remaps;
pool->dirty_watermark = params->dirty_watermark;
pool->dirty_len = 0;
spin_lock_init(&pool->pool_lock);
atomic_set(&pool->req_ser, 0);
atomic_set(&pool->flush_ser, 0);
init_waitqueue_head(&pool->force_wait);
pool->worker =
kthread_create_worker(0, "ib_fmr(%s)", dev_name(&device->dev));
if (IS_ERR(pool->worker)) {
pr_warn(PFX "couldn't start cleanup kthread worker\n");
ret = PTR_ERR(pool->worker);
goto out_free_pool;
}
kthread_init_work(&pool->work, ib_fmr_cleanup_func);
{
struct ib_pool_fmr *fmr;
struct ib_fmr_attr fmr_attr = {
.max_pages = params->max_pages_per_fmr,
.max_maps = pool->max_remaps,
.page_shift = params->page_shift
};
int bytes_per_fmr = sizeof *fmr;
if (pool->cache_bucket)
bytes_per_fmr += params->max_pages_per_fmr * sizeof (u64);
for (i = 0; i < params->pool_size; ++i) {
fmr = kmalloc(bytes_per_fmr, GFP_KERNEL);
if (!fmr)
goto out_fail;
fmr->pool = pool;
fmr->remap_count = 0;
fmr->ref_count = 0;
INIT_HLIST_NODE(&fmr->cache_node);
fmr->fmr = ib_alloc_fmr(pd, params->access, &fmr_attr);
if (IS_ERR(fmr->fmr)) {
pr_warn(PFX "fmr_create failed for FMR %d\n",
i);
kfree(fmr);
goto out_fail;
}
list_add_tail(&fmr->list, &pool->free_list);
++pool->pool_size;
}
}
return pool;
out_free_pool:
kfree(pool->cache_bucket);
kfree(pool);
return ERR_PTR(ret);
out_fail:
ib_destroy_fmr_pool(pool);
return ERR_PTR(-ENOMEM);
}
EXPORT_SYMBOL(ib_create_fmr_pool);
/**
* ib_destroy_fmr_pool - Free FMR pool
* @pool:FMR pool to free
*
* Destroy an FMR pool and free all associated resources.
*/
void ib_destroy_fmr_pool(struct ib_fmr_pool *pool)
{
struct ib_pool_fmr *fmr;
struct ib_pool_fmr *tmp;
LIST_HEAD(fmr_list);
int i;
kthread_destroy_worker(pool->worker);
ib_fmr_batch_release(pool);
i = 0;
list_for_each_entry_safe(fmr, tmp, &pool->free_list, list) {
if (fmr->remap_count) {
INIT_LIST_HEAD(&fmr_list);
list_add_tail(&fmr->fmr->list, &fmr_list);
ib_unmap_fmr(&fmr_list);
}
ib_dealloc_fmr(fmr->fmr);
list_del(&fmr->list);
kfree(fmr);
++i;
}
if (i < pool->pool_size)
pr_warn(PFX "pool still has %d regions registered\n",
pool->pool_size - i);
kfree(pool->cache_bucket);
kfree(pool);
}
EXPORT_SYMBOL(ib_destroy_fmr_pool);
/**
* ib_flush_fmr_pool - Invalidate all unmapped FMRs
* @pool:FMR pool to flush
*
* Ensure that all unmapped FMRs are fully invalidated.
*/
int ib_flush_fmr_pool(struct ib_fmr_pool *pool)
{
int serial;
struct ib_pool_fmr *fmr, *next;
/*
* The free_list holds FMRs that may have been used
* but have not been remapped enough times to be dirty.
* Put them on the dirty list now so that the cleanup
* thread will reap them too.
*/
spin_lock_irq(&pool->pool_lock);
list_for_each_entry_safe(fmr, next, &pool->free_list, list) {
if (fmr->remap_count > 0)
list_move(&fmr->list, &pool->dirty_list);
}
spin_unlock_irq(&pool->pool_lock);
serial = atomic_inc_return(&pool->req_ser);
kthread_queue_work(pool->worker, &pool->work);
if (wait_event_interruptible(pool->force_wait,
atomic_read(&pool->flush_ser) - serial >= 0))
return -EINTR;
return 0;
}
EXPORT_SYMBOL(ib_flush_fmr_pool);
/**
* ib_fmr_pool_map_phys - Map an FMR from an FMR pool.
* @pool_handle: FMR pool to allocate FMR from
* @page_list: List of pages to map
* @list_len: Number of pages in @page_list
* @io_virtual_address: I/O virtual address for new FMR
*/
struct ib_pool_fmr *ib_fmr_pool_map_phys(struct ib_fmr_pool *pool_handle,
u64 *page_list,
int list_len,
u64 io_virtual_address)
{
struct ib_fmr_pool *pool = pool_handle;
struct ib_pool_fmr *fmr;
unsigned long flags;
int result;
if (list_len < 1 || list_len > pool->max_pages)
return ERR_PTR(-EINVAL);
spin_lock_irqsave(&pool->pool_lock, flags);
fmr = ib_fmr_cache_lookup(pool,
page_list,
list_len,
io_virtual_address);
if (fmr) {
/* found in cache */
++fmr->ref_count;
if (fmr->ref_count == 1) {
list_del(&fmr->list);
}
spin_unlock_irqrestore(&pool->pool_lock, flags);
return fmr;
}
if (list_empty(&pool->free_list)) {
spin_unlock_irqrestore(&pool->pool_lock, flags);
return ERR_PTR(-EAGAIN);
}
fmr = list_entry(pool->free_list.next, struct ib_pool_fmr, list);
list_del(&fmr->list);
hlist_del_init(&fmr->cache_node);
spin_unlock_irqrestore(&pool->pool_lock, flags);
result = ib_map_phys_fmr(fmr->fmr, page_list, list_len,
io_virtual_address);
if (result) {
spin_lock_irqsave(&pool->pool_lock, flags);
list_add(&fmr->list, &pool->free_list);
spin_unlock_irqrestore(&pool->pool_lock, flags);
pr_warn(PFX "fmr_map returns %d\n", result);
return ERR_PTR(result);
}
++fmr->remap_count;
fmr->ref_count = 1;
if (pool->cache_bucket) {
fmr->io_virtual_address = io_virtual_address;
fmr->page_list_len = list_len;
memcpy(fmr->page_list, page_list, list_len * sizeof(*page_list));
spin_lock_irqsave(&pool->pool_lock, flags);
hlist_add_head(&fmr->cache_node,
pool->cache_bucket + ib_fmr_hash(fmr->page_list[0]));
spin_unlock_irqrestore(&pool->pool_lock, flags);
}
return fmr;
}
EXPORT_SYMBOL(ib_fmr_pool_map_phys);
/**
* ib_fmr_pool_unmap - Unmap FMR
* @fmr:FMR to unmap
*
* Unmap an FMR. The FMR mapping may remain valid until the FMR is
* reused (or until ib_flush_fmr_pool() is called).
*/
void ib_fmr_pool_unmap(struct ib_pool_fmr *fmr)
{
struct ib_fmr_pool *pool;
unsigned long flags;
pool = fmr->pool;
spin_lock_irqsave(&pool->pool_lock, flags);
--fmr->ref_count;
if (!fmr->ref_count) {
if (fmr->remap_count < pool->max_remaps) {
list_add_tail(&fmr->list, &pool->free_list);
} else {
list_add_tail(&fmr->list, &pool->dirty_list);
if (++pool->dirty_len >= pool->dirty_watermark) {
atomic_inc(&pool->req_ser);
kthread_queue_work(pool->worker, &pool->work);
}
}
}
spin_unlock_irqrestore(&pool->pool_lock, flags);
}
EXPORT_SYMBOL(ib_fmr_pool_unmap);

93
include/rdma/ib_fmr_pool.h
View File

@ -1,93 +0,0 @@
/*
* Copyright (c) 2004 Topspin Corporation. All rights reserved.
* Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
*
* This software is available to you under a choice of one of two
* licenses. You may choose to be licensed under the terms of the GNU
* General Public License (GPL) Version 2, available from the file
* COPYING in the main directory of this source tree, or the
* OpenIB.org BSD license below:
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* - Redistributions of source code must retain the above
* copyright notice, this list of conditions and the following
* disclaimer.
*
* - Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#if !defined(IB_FMR_POOL_H)
#define IB_FMR_POOL_H
#include <rdma/ib_verbs.h>
struct ib_fmr_pool;
/**
* struct ib_fmr_pool_param - Parameters for creating FMR pool
* @max_pages_per_fmr:Maximum number of pages per map request.
* @page_shift: Log2 of sizeof "pages" mapped by this fmr
* @access:Access flags for FMRs in pool.
* @pool_size:Number of FMRs to allocate for pool.
* @dirty_watermark:Flush is triggered when @dirty_watermark dirty
* FMRs are present.
* @flush_function:Callback called when unmapped FMRs are flushed and
* more FMRs are possibly available for mapping
* @flush_arg:Context passed to user's flush function.
* @cache:If set, FMRs may be reused after unmapping for identical map
* requests.
*/
struct ib_fmr_pool_param {
int max_pages_per_fmr;
int page_shift;
enum ib_access_flags access;
int pool_size;
int dirty_watermark;
void (*flush_function)(struct ib_fmr_pool *pool,
void *arg);
void *flush_arg;
unsigned cache:1;
};
struct ib_pool_fmr {
struct ib_fmr *fmr;
struct ib_fmr_pool *pool;
struct list_head list;
struct hlist_node cache_node;
int ref_count;
int remap_count;
u64 io_virtual_address;
int page_list_len;
u64 page_list[];
};
struct ib_fmr_pool *ib_create_fmr_pool(struct ib_pd *pd,
struct ib_fmr_pool_param *params);
void ib_destroy_fmr_pool(struct ib_fmr_pool *pool);
int ib_flush_fmr_pool(struct ib_fmr_pool *pool);
struct ib_pool_fmr *ib_fmr_pool_map_phys(struct ib_fmr_pool *pool_handle,
u64 *page_list,
int list_len,
u64 io_virtual_address);
void ib_fmr_pool_unmap(struct ib_pool_fmr *fmr);
#endif /* IB_FMR_POOL_H */