mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-23 04:34:11 +08:00
a4d61e8480
Move the InfiniBand headers from drivers/infiniband/include to include/rdma. This allows InfiniBand-using code to live elsewhere, and lets us remove the ugly EXTRA_CFLAGS include path from the InfiniBand Makefiles. Signed-off-by: Roland Dreier <rolandd@cisco.com>
512 lines
13 KiB
C
512 lines
13 KiB
C
/*
|
|
* 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.
|
|
*
|
|
* $Id: fmr_pool.c 2730 2005-06-28 16:43:03Z sean.hefty $
|
|
*/
|
|
|
|
#include <linux/errno.h>
|
|
#include <linux/spinlock.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/jhash.h>
|
|
#include <linux/kthread.h>
|
|
|
|
#include <rdma/ib_fmr_pool.h>
|
|
|
|
#include "core_priv.h"
|
|
|
|
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 < IB_FMR_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 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 task_struct *thread;
|
|
|
|
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;
|
|
struct hlist_node *pos;
|
|
|
|
if (!pool->cache_bucket)
|
|
return NULL;
|
|
|
|
bucket = pool->cache_bucket + ib_fmr_hash(*page_list);
|
|
|
|
hlist_for_each_entry(fmr, pos, 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);
|
|
|
|
#ifdef DEBUG
|
|
if (fmr->ref_count !=0) {
|
|
printk(KERN_WARNING "Unmapping FMR 0x%08x with ref count %d",
|
|
fmr, fmr->ref_count);
|
|
}
|
|
#endif
|
|
}
|
|
|
|
list_splice(&pool->dirty_list, &unmap_list);
|
|
INIT_LIST_HEAD(&pool->dirty_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)
|
|
printk(KERN_WARNING "ib_unmap_fmr returned %d", ret);
|
|
|
|
spin_lock_irq(&pool->pool_lock);
|
|
list_splice(&unmap_list, &pool->free_list);
|
|
spin_unlock_irq(&pool->pool_lock);
|
|
}
|
|
|
|
static int ib_fmr_cleanup_thread(void *pool_ptr)
|
|
{
|
|
struct ib_fmr_pool *pool = pool_ptr;
|
|
|
|
do {
|
|
if (pool->dirty_len >= pool->dirty_watermark ||
|
|
atomic_read(&pool->flush_ser) - atomic_read(&pool->req_ser) < 0) {
|
|
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);
|
|
}
|
|
|
|
set_current_state(TASK_INTERRUPTIBLE);
|
|
if (pool->dirty_len < pool->dirty_watermark &&
|
|
atomic_read(&pool->flush_ser) - atomic_read(&pool->req_ser) >= 0 &&
|
|
!kthread_should_stop())
|
|
schedule();
|
|
__set_current_state(TASK_RUNNING);
|
|
} while (!kthread_should_stop());
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* 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;
|
|
|
|
if (!params)
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
device = pd->device;
|
|
if (!device->alloc_fmr || !device->dealloc_fmr ||
|
|
!device->map_phys_fmr || !device->unmap_fmr) {
|
|
printk(KERN_WARNING "Device %s does not support fast memory regions",
|
|
device->name);
|
|
return ERR_PTR(-ENOSYS);
|
|
}
|
|
|
|
pool = kmalloc(sizeof *pool, GFP_KERNEL);
|
|
if (!pool) {
|
|
printk(KERN_WARNING "couldn't allocate pool struct");
|
|
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(IB_FMR_HASH_SIZE * sizeof *pool->cache_bucket,
|
|
GFP_KERNEL);
|
|
if (!pool->cache_bucket) {
|
|
printk(KERN_WARNING "Failed to allocate cache in pool");
|
|
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->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->thread = kthread_create(ib_fmr_cleanup_thread,
|
|
pool,
|
|
"ib_fmr(%s)",
|
|
device->name);
|
|
if (IS_ERR(pool->thread)) {
|
|
printk(KERN_WARNING "couldn't start cleanup thread");
|
|
ret = PTR_ERR(pool->thread);
|
|
goto out_free_pool;
|
|
}
|
|
|
|
{
|
|
struct ib_pool_fmr *fmr;
|
|
struct ib_fmr_attr attr = {
|
|
.max_pages = params->max_pages_per_fmr,
|
|
.max_maps = IB_FMR_MAX_REMAPS,
|
|
.page_size = PAGE_SHIFT
|
|
};
|
|
|
|
for (i = 0; i < params->pool_size; ++i) {
|
|
fmr = kmalloc(sizeof *fmr + params->max_pages_per_fmr * sizeof (u64),
|
|
GFP_KERNEL);
|
|
if (!fmr) {
|
|
printk(KERN_WARNING "failed to allocate fmr struct "
|
|
"for FMR %d", i);
|
|
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, &attr);
|
|
if (IS_ERR(fmr->fmr)) {
|
|
printk(KERN_WARNING "fmr_create failed for FMR %d", 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_stop(pool->thread);
|
|
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)
|
|
printk(KERN_WARNING "pool still has %d regions registered",
|
|
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;
|
|
|
|
atomic_inc(&pool->req_ser);
|
|
/*
|
|
* It's OK if someone else bumps req_ser again here -- we'll
|
|
* just wait a little longer.
|
|
*/
|
|
serial = atomic_read(&pool->req_ser);
|
|
|
|
wake_up_process(pool->thread);
|
|
|
|
if (wait_event_interruptible(pool->force_wait,
|
|
atomic_read(&pool->flush_ser) -
|
|
atomic_read(&pool->req_ser) >= 0))
|
|
return -EINTR;
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(ib_flush_fmr_pool);
|
|
|
|
/**
|
|
* ib_fmr_pool_map_phys -
|
|
* @pool: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
|
|
*
|
|
* Map an FMR from an FMR 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)
|
|
{
|
|
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);
|
|
|
|
printk(KERN_WARNING "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).
|
|
*/
|
|
int 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 < IB_FMR_MAX_REMAPS) {
|
|
list_add_tail(&fmr->list, &pool->free_list);
|
|
} else {
|
|
list_add_tail(&fmr->list, &pool->dirty_list);
|
|
++pool->dirty_len;
|
|
wake_up_process(pool->thread);
|
|
}
|
|
}
|
|
|
|
#ifdef DEBUG
|
|
if (fmr->ref_count < 0)
|
|
printk(KERN_WARNING "FMR %p has ref count %d < 0",
|
|
fmr, fmr->ref_count);
|
|
#endif
|
|
|
|
spin_unlock_irqrestore(&pool->pool_lock, flags);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(ib_fmr_pool_unmap);
|