Linux-2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 507 insertions, 0 deletions

diff --git a/drivers/infiniband/core/fmr_pool.c b/drivers/infiniband/core/fmr_pool.c
new file mode 100644
index 000000000000..2e9469f18926
--- /dev/null
+++ b/drivers/infiniband/core/fmr_pool.c
@@ -0,0 +1,507 @@
+/*
+ * Copyright (c) 2004 Topspin Communications.  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 1349 2004-12-16 21:09:43Z roland $
+ */
+
+#include <linux/errno.h>
+#include <linux/spinlock.h>
+#include <linux/slab.h>
+#include <linux/jhash.h>
+#include <linux/kthread.h>
+
+#include <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);
+}
+
+/* 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.
+ */
+int ib_destroy_fmr_pool(struct ib_fmr_pool *pool)
+{
+	struct ib_pool_fmr *fmr;
+	struct ib_pool_fmr *tmp;
+	int                 i;
+
+	kthread_stop(pool->thread);
+	ib_fmr_batch_release(pool);
+
+	i = 0;
+	list_for_each_entry_safe(fmr, tmp, &pool->free_list, 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);
+
+	return 0;
+}
+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",
+		       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);