diff options
Diffstat (limited to 'crypto/async_tx')
| -rw-r--r-- | crypto/async_tx/Kconfig | 16 | ||||
| -rw-r--r-- | crypto/async_tx/Makefile | 4 | ||||
| -rw-r--r-- | crypto/async_tx/async_memcpy.c | 131 | ||||
| -rw-r--r-- | crypto/async_tx/async_memset.c | 109 | ||||
| -rw-r--r-- | crypto/async_tx/async_tx.c | 497 | ||||
| -rw-r--r-- | crypto/async_tx/async_xor.c | 327 |
6 files changed, 1084 insertions, 0 deletions
diff --git a/crypto/async_tx/Kconfig b/crypto/async_tx/Kconfig new file mode 100644 index 000000000000..d8fb39145986 --- /dev/null +++ b/crypto/async_tx/Kconfig @@ -0,0 +1,16 @@ +config ASYNC_CORE + tristate + +config ASYNC_MEMCPY + tristate + select ASYNC_CORE + +config ASYNC_XOR + tristate + select ASYNC_CORE + select XOR_BLOCKS + +config ASYNC_MEMSET + tristate + select ASYNC_CORE + diff --git a/crypto/async_tx/Makefile b/crypto/async_tx/Makefile new file mode 100644 index 000000000000..27baa7d52fbc --- /dev/null +++ b/crypto/async_tx/Makefile @@ -0,0 +1,4 @@ +obj-$(CONFIG_ASYNC_CORE) += async_tx.o +obj-$(CONFIG_ASYNC_MEMCPY) += async_memcpy.o +obj-$(CONFIG_ASYNC_MEMSET) += async_memset.o +obj-$(CONFIG_ASYNC_XOR) += async_xor.o diff --git a/crypto/async_tx/async_memcpy.c b/crypto/async_tx/async_memcpy.c new file mode 100644 index 000000000000..a973f4ef897d --- /dev/null +++ b/crypto/async_tx/async_memcpy.c @@ -0,0 +1,131 @@ +/* + * copy offload engine support + * + * Copyright © 2006, Intel Corporation. + * + * Dan Williams <dan.j.williams@intel.com> + * + * with architecture considerations by: + * Neil Brown <neilb@suse.de> + * Jeff Garzik <jeff@garzik.org> + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License along with + * this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. + * + */ +#include <linux/kernel.h> +#include <linux/highmem.h> +#include <linux/mm.h> +#include <linux/dma-mapping.h> +#include <linux/async_tx.h> + +/** + * async_memcpy - attempt to copy memory with a dma engine. + * @dest: destination page + * @src: src page + * @offset: offset in pages to start transaction + * @len: length in bytes + * @flags: ASYNC_TX_ASSUME_COHERENT, ASYNC_TX_ACK, ASYNC_TX_DEP_ACK, + * ASYNC_TX_KMAP_SRC, ASYNC_TX_KMAP_DST + * @depend_tx: memcpy depends on the result of this transaction + * @cb_fn: function to call when the memcpy completes + * @cb_param: parameter to pass to the callback routine + */ +struct dma_async_tx_descriptor * +async_memcpy(struct page *dest, struct page *src, unsigned int dest_offset, + unsigned int src_offset, size_t len, enum async_tx_flags flags, + struct dma_async_tx_descriptor *depend_tx, + dma_async_tx_callback cb_fn, void *cb_param) +{ + struct dma_chan *chan = async_tx_find_channel(depend_tx, DMA_MEMCPY); + struct dma_device *device = chan ? chan->device : NULL; + int int_en = cb_fn ? 1 : 0; + struct dma_async_tx_descriptor *tx = device ? + device->device_prep_dma_memcpy(chan, len, + int_en) : NULL; + + if (tx) { /* run the memcpy asynchronously */ + dma_addr_t addr; + enum dma_data_direction dir; + + pr_debug("%s: (async) len: %zu\n", __FUNCTION__, len); + + dir = (flags & ASYNC_TX_ASSUME_COHERENT) ? + DMA_NONE : DMA_FROM_DEVICE; + + addr = dma_map_page(device->dev, dest, dest_offset, len, dir); + tx->tx_set_dest(addr, tx, 0); + + dir = (flags & ASYNC_TX_ASSUME_COHERENT) ? + DMA_NONE : DMA_TO_DEVICE; + + addr = dma_map_page(device->dev, src, src_offset, len, dir); + tx->tx_set_src(addr, tx, 0); + + async_tx_submit(chan, tx, flags, depend_tx, cb_fn, cb_param); + } else { /* run the memcpy synchronously */ + void *dest_buf, *src_buf; + pr_debug("%s: (sync) len: %zu\n", __FUNCTION__, len); + + /* wait for any prerequisite operations */ + if (depend_tx) { + /* if ack is already set then we cannot be sure + * we are referring to the correct operation + */ + BUG_ON(depend_tx->ack); + if (dma_wait_for_async_tx(depend_tx) == DMA_ERROR) + panic("%s: DMA_ERROR waiting for depend_tx\n", + __FUNCTION__); + } + + if (flags & ASYNC_TX_KMAP_DST) + dest_buf = kmap_atomic(dest, KM_USER0) + dest_offset; + else + dest_buf = page_address(dest) + dest_offset; + + if (flags & ASYNC_TX_KMAP_SRC) + src_buf = kmap_atomic(src, KM_USER0) + src_offset; + else + src_buf = page_address(src) + src_offset; + + memcpy(dest_buf, src_buf, len); + + if (flags & ASYNC_TX_KMAP_DST) + kunmap_atomic(dest_buf, KM_USER0); + + if (flags & ASYNC_TX_KMAP_SRC) + kunmap_atomic(src_buf, KM_USER0); + + async_tx_sync_epilog(flags, depend_tx, cb_fn, cb_param); + } + + return tx; +} +EXPORT_SYMBOL_GPL(async_memcpy); + +static int __init async_memcpy_init(void) +{ + return 0; +} + +static void __exit async_memcpy_exit(void) +{ + do { } while (0); +} + +module_init(async_memcpy_init); +module_exit(async_memcpy_exit); + +MODULE_AUTHOR("Intel Corporation"); +MODULE_DESCRIPTION("asynchronous memcpy api"); +MODULE_LICENSE("GPL"); diff --git a/crypto/async_tx/async_memset.c b/crypto/async_tx/async_memset.c new file mode 100644 index 000000000000..66ef6351202e --- /dev/null +++ b/crypto/async_tx/async_memset.c @@ -0,0 +1,109 @@ +/* + * memory fill offload engine support + * + * Copyright © 2006, Intel Corporation. + * + * Dan Williams <dan.j.williams@intel.com> + * + * with architecture considerations by: + * Neil Brown <neilb@suse.de> + * Jeff Garzik <jeff@garzik.org> + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License along with + * this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. + * + */ +#include <linux/kernel.h> +#include <linux/interrupt.h> +#include <linux/mm.h> +#include <linux/dma-mapping.h> +#include <linux/async_tx.h> + +/** + * async_memset - attempt to fill memory with a dma engine. + * @dest: destination page + * @val: fill value + * @offset: offset in pages to start transaction + * @len: length in bytes + * @flags: ASYNC_TX_ASSUME_COHERENT, ASYNC_TX_ACK, ASYNC_TX_DEP_ACK + * @depend_tx: memset depends on the result of this transaction + * @cb_fn: function to call when the memcpy completes + * @cb_param: parameter to pass to the callback routine + */ +struct dma_async_tx_descriptor * +async_memset(struct page *dest, int val, unsigned int offset, + size_t len, enum async_tx_flags flags, + struct dma_async_tx_descriptor *depend_tx, + dma_async_tx_callback cb_fn, void *cb_param) +{ + struct dma_chan *chan = async_tx_find_channel(depend_tx, DMA_MEMSET); + struct dma_device *device = chan ? chan->device : NULL; + int int_en = cb_fn ? 1 : 0; + struct dma_async_tx_descriptor *tx = device ? + device->device_prep_dma_memset(chan, val, len, + int_en) : NULL; + + if (tx) { /* run the memset asynchronously */ + dma_addr_t dma_addr; + enum dma_data_direction dir; + + pr_debug("%s: (async) len: %zu\n", __FUNCTION__, len); + dir = (flags & ASYNC_TX_ASSUME_COHERENT) ? + DMA_NONE : DMA_FROM_DEVICE; + + dma_addr = dma_map_page(device->dev, dest, offset, len, dir); + tx->tx_set_dest(dma_addr, tx, 0); + + async_tx_submit(chan, tx, flags, depend_tx, cb_fn, cb_param); + } else { /* run the memset synchronously */ + void *dest_buf; + pr_debug("%s: (sync) len: %zu\n", __FUNCTION__, len); + + dest_buf = (void *) (((char *) page_address(dest)) + offset); + + /* wait for any prerequisite operations */ + if (depend_tx) { + /* if ack is already set then we cannot be sure + * we are referring to the correct operation + */ + BUG_ON(depend_tx->ack); + if (dma_wait_for_async_tx(depend_tx) == DMA_ERROR) + panic("%s: DMA_ERROR waiting for depend_tx\n", + __FUNCTION__); + } + + memset(dest_buf, val, len); + + async_tx_sync_epilog(flags, depend_tx, cb_fn, cb_param); + } + + return tx; +} +EXPORT_SYMBOL_GPL(async_memset); + +static int __init async_memset_init(void) +{ + return 0; +} + +static void __exit async_memset_exit(void) +{ + do { } while (0); +} + +module_init(async_memset_init); +module_exit(async_memset_exit); + +MODULE_AUTHOR("Intel Corporation"); +MODULE_DESCRIPTION("asynchronous memset api"); +MODULE_LICENSE("GPL"); diff --git a/crypto/async_tx/async_tx.c b/crypto/async_tx/async_tx.c new file mode 100644 index 000000000000..035007145e78 --- /dev/null +++ b/crypto/async_tx/async_tx.c @@ -0,0 +1,497 @@ +/* + * core routines for the asynchronous memory transfer/transform api + * + * Copyright © 2006, Intel Corporation. + * + * Dan Williams <dan.j.williams@intel.com> + * + * with architecture considerations by: + * Neil Brown <neilb@suse.de> + * Jeff Garzik <jeff@garzik.org> + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License along with + * this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. + * + */ +#include <linux/kernel.h> +#include <linux/async_tx.h> + +#ifdef CONFIG_DMA_ENGINE +static enum dma_state_client +dma_channel_add_remove(struct dma_client *client, + struct dma_chan *chan, enum dma_state state); + +static struct dma_client async_tx_dma = { + .event_callback = dma_channel_add_remove, + /* .cap_mask == 0 defaults to all channels */ +}; + +/** + * dma_cap_mask_all - enable iteration over all operation types + */ +static dma_cap_mask_t dma_cap_mask_all; + +/** + * chan_ref_percpu - tracks channel allocations per core/opertion + */ +struct chan_ref_percpu { + struct dma_chan_ref *ref; +}; + +static int channel_table_initialized; +static struct chan_ref_percpu *channel_table[DMA_TX_TYPE_END]; + +/** + * async_tx_lock - protect modification of async_tx_master_list and serialize + * rebalance operations + */ +static spinlock_t async_tx_lock; + +static struct list_head +async_tx_master_list = LIST_HEAD_INIT(async_tx_master_list); + +/* async_tx_issue_pending_all - start all transactions on all channels */ +void async_tx_issue_pending_all(void) +{ + struct dma_chan_ref *ref; + + rcu_read_lock(); + list_for_each_entry_rcu(ref, &async_tx_master_list, node) + ref->chan->device->device_issue_pending(ref->chan); + rcu_read_unlock(); +} +EXPORT_SYMBOL_GPL(async_tx_issue_pending_all); + +/* dma_wait_for_async_tx - spin wait for a transcation to complete + * @tx: transaction to wait on + */ +enum dma_status +dma_wait_for_async_tx(struct dma_async_tx_descriptor *tx) +{ + enum dma_status status; + struct dma_async_tx_descriptor *iter; + + if (!tx) + return DMA_SUCCESS; + + /* poll through the dependency chain, return when tx is complete */ + do { + iter = tx; + while (iter->cookie == -EBUSY) + iter = iter->parent; + + status = dma_sync_wait(iter->chan, iter->cookie); + } while (status == DMA_IN_PROGRESS || (iter != tx)); + + return status; +} +EXPORT_SYMBOL_GPL(dma_wait_for_async_tx); + +/* async_tx_run_dependencies - helper routine for dma drivers to process + * (start) dependent operations on their target channel + * @tx: transaction with dependencies + */ +void +async_tx_run_dependencies(struct dma_async_tx_descriptor *tx) +{ + struct dma_async_tx_descriptor *dep_tx, *_dep_tx; + struct dma_device *dev; + struct dma_chan *chan; + + list_for_each_entry_safe(dep_tx, _dep_tx, &tx->depend_list, + depend_node) { + chan = dep_tx->chan; + dev = chan->device; + /* we can't depend on ourselves */ + BUG_ON(chan == tx->chan); + list_del(&dep_tx->depend_node); + tx->tx_submit(dep_tx); + + /* we need to poke the engine as client code does not + * know about dependency submission events + */ + dev->device_issue_pending(chan); + } +} +EXPORT_SYMBOL_GPL(async_tx_run_dependencies); + +static void +free_dma_chan_ref(struct rcu_head *rcu) +{ + struct dma_chan_ref *ref; + ref = container_of(rcu, struct dma_chan_ref, rcu); + kfree(ref); +} + +static void +init_dma_chan_ref(struct dma_chan_ref *ref, struct dma_chan *chan) +{ + INIT_LIST_HEAD(&ref->node); + INIT_RCU_HEAD(&ref->rcu); + ref->chan = chan; + atomic_set(&ref->count, 0); +} + +/** + * get_chan_ref_by_cap - returns the nth channel of the given capability + * defaults to returning the channel with the desired capability and the + * lowest reference count if the index can not be satisfied + * @cap: capability to match + * @index: nth channel desired, passing -1 has the effect of forcing the + * default return value + */ +static struct dma_chan_ref * +get_chan_ref_by_cap(enum dma_transaction_type cap, int index) +{ + struct dma_chan_ref *ret_ref = NULL, *min_ref = NULL, *ref; + + rcu_read_lock(); + list_for_each_entry_rcu(ref, &async_tx_master_list, node) + if (dma_has_cap(cap, ref->chan->device->cap_mask)) { + if (!min_ref) + min_ref = ref; + else if (atomic_read(&ref->count) < + atomic_read(&min_ref->count)) + min_ref = ref; + + if (index-- == 0) { + ret_ref = ref; + break; + } + } + rcu_read_unlock(); + + if (!ret_ref) + ret_ref = min_ref; + + if (ret_ref) + atomic_inc(&ret_ref->count); + + return ret_ref; +} + +/** + * async_tx_rebalance - redistribute the available channels, optimize + * for cpu isolation in the SMP case, and opertaion isolation in the + * uniprocessor case + */ +static void async_tx_rebalance(void) +{ + int cpu, cap, cpu_idx = 0; + unsigned long flags; + + if (!channel_table_initialized) + return; + + spin_lock_irqsave(&async_tx_lock, flags); + + /* undo the last distribution */ + for_each_dma_cap_mask(cap, dma_cap_mask_all) + for_each_possible_cpu(cpu) { + struct dma_chan_ref *ref = + per_cpu_ptr(channel_table[cap], cpu)->ref; + if (ref) { + atomic_set(&ref->count, 0); + per_cpu_ptr(channel_table[cap], cpu)->ref = + NULL; + } + } + + for_each_dma_cap_mask(cap, dma_cap_mask_all) + for_each_online_cpu(cpu) { + struct dma_chan_ref *new; + if (NR_CPUS > 1) + new = get_chan_ref_by_cap(cap, cpu_idx++); + else + new = get_chan_ref_by_cap(cap, -1); + + per_cpu_ptr(channel_table[cap], cpu)->ref = new; + } + + spin_unlock_irqrestore(&async_tx_lock, flags); +} + +static enum dma_state_client +dma_channel_add_remove(struct dma_client *client, + struct dma_chan *chan, enum dma_state state) +{ + unsigned long found, flags; + struct dma_chan_ref *master_ref, *ref; + enum dma_state_client ack = DMA_DUP; /* default: take no action */ + + switch (state) { + case DMA_RESOURCE_AVAILABLE: + found = 0; + rcu_read_lock(); + list_for_each_entry_rcu(ref, &async_tx_master_list, node) + if (ref->chan == chan) { + found = 1; + break; + } + rcu_read_unlock(); + + pr_debug("async_tx: dma resource available [%s]\n", + found ? "old" : "new"); + + if (!found) + ack = DMA_ACK; + else + break; + + /* add the channel to the generic management list */ + master_ref = kmalloc(sizeof(*master_ref), GFP_KERNEL); + if (master_ref) { + /* keep a reference until async_tx is unloaded */ + dma_chan_get(chan); + init_dma_chan_ref(master_ref, chan); + spin_lock_irqsave(&async_tx_lock, flags); + list_add_tail_rcu(&master_ref->node, + &async_tx_master_list); + spin_unlock_irqrestore(&async_tx_lock, + flags); + } else { + printk(KERN_WARNING "async_tx: unable to create" + " new master entry in response to" + " a DMA_RESOURCE_ADDED event" + " (-ENOMEM)\n"); + return 0; + } + + async_tx_rebalance(); + break; + case DMA_RESOURCE_REMOVED: + found = 0; + spin_lock_irqsave(&async_tx_lock, flags); + list_for_each_entry_rcu(ref, &async_tx_master_list, node) + if (ref->chan == chan) { + /* permit backing devices to go away */ + dma_chan_put(ref->chan); + list_del_rcu(&ref->node); + call_rcu(&ref->rcu, free_dma_chan_ref); + found = 1; + break; + } + spin_unlock_irqrestore(&async_tx_lock, flags); + + pr_debug("async_tx: dma resource removed [%s]\n", + found ? "ours" : "not ours"); + + if (found) + ack = DMA_ACK; + else + break; + + async_tx_rebalance(); + break; + case DMA_RESOURCE_SUSPEND: + case DMA_RESOURCE_RESUME: + printk(KERN_WARNING "async_tx: does not support dma channel" + " suspend/resume\n"); + break; + default: + BUG(); + } + + return ack; +} + +static int __init +async_tx_init(void) +{ + enum dma_transaction_type cap; + + spin_lock_init(&async_tx_lock); + bitmap_fill(dma_cap_mask_all.bits, DMA_TX_TYPE_END); + + /* an interrupt will never be an explicit operation type. + * clearing this bit prevents allocation to a slot in 'channel_table' + */ + clear_bit(DMA_INTERRUPT, dma_cap_mask_all.bits); + + for_each_dma_cap_mask(cap, dma_cap_mask_all) { + channel_table[cap] = alloc_percpu(struct chan_ref_percpu); + if (!channel_table[cap]) + goto err; + } + + channel_table_initialized = 1; + dma_async_client_register(&async_tx_dma); + dma_async_client_chan_request(&async_tx_dma); + + printk(KERN_INFO "async_tx: api initialized (async)\n"); + + return 0; +err: + printk(KERN_ERR "async_tx: initialization failure\n"); + + while (--cap >= 0) + free_percpu(channel_table[cap]); + + return 1; +} + +static void __exit async_tx_exit(void) +{ + enum dma_transaction_type cap; + + channel_table_initialized = 0; + + for_each_dma_cap_mask(cap, dma_cap_mask_all) + if (channel_table[cap]) + free_percpu(channel_table[cap]); + + dma_async_client_unregister(&async_tx_dma); +} + +/** + * async_tx_find_channel - find a channel to carry out the operation or let + * the transaction execute synchronously + * @depend_tx: transaction dependency + * @tx_type: transaction type + */ +struct dma_chan * +async_tx_find_channel(struct dma_async_tx_descriptor *depend_tx, + enum dma_transaction_type tx_type) +{ + /* see if we can keep the chain on one channel */ + if (depend_tx && + dma_has_cap(tx_type, depend_tx->chan->device->cap_mask)) + return depend_tx->chan; + else if (likely(channel_table_initialized)) { + struct dma_chan_ref *ref; + int cpu = get_cpu(); + ref = per_cpu_ptr(channel_table[tx_type], cpu)->ref; + put_cpu(); + return ref ? ref->chan : NULL; + } else + return NULL; +} +EXPORT_SYMBOL_GPL(async_tx_find_channel); +#else +static int __init async_tx_init(void) +{ + printk(KERN_INFO "async_tx: api initialized (sync-only)\n"); + return 0; +} + +static void __exit async_tx_exit(void) +{ + do { } while (0); +} +#endif + +void +async_tx_submit(struct dma_chan *chan, struct dma_async_tx_descriptor *tx, + enum async_tx_flags flags, struct dma_async_tx_descriptor *depend_tx, + dma_async_tx_callback cb_fn, void *cb_param) +{ + tx->callback = cb_fn; + tx->callback_param = cb_param; + + /* set this new tx to run after depend_tx if: + * 1/ a dependency exists (depend_tx is !NULL) + * 2/ the tx can not be submitted to the current channel + */ + if (depend_tx && depend_tx->chan != chan) { + /* if ack is already set then we cannot be sure + * we are referring to the correct operation + */ + BUG_ON(depend_tx->ack); + + tx->parent = depend_tx; + spin_lock_bh(&depend_tx->lock); + list_add_tail(&tx->depend_node, &depend_tx->depend_list); + if (depend_tx->cookie == 0) { + struct dma_chan *dep_chan = depend_tx->chan; + struct dma_device *dep_dev = dep_chan->device; + dep_dev->device_dependency_added(dep_chan); + } + spin_unlock_bh(&depend_tx->lock); + + /* schedule an interrupt to trigger the channel switch */ + async_trigger_callback(ASYNC_TX_ACK, depend_tx, NULL, NULL); + } else { + tx->parent = NULL; + tx->tx_submit(tx); + } + + if (flags & ASYNC_TX_ACK) + async_tx_ack(tx); + + if (depend_tx && (flags & ASYNC_TX_DEP_ACK)) + async_tx_ack(depend_tx); +} +EXPORT_SYMBOL_GPL(async_tx_submit); + +/** + * async_trigger_callback - schedules the callback function to be run after + * any dependent operations have been completed. + * @flags: ASYNC_TX_ACK, ASYNC_TX_DEP_ACK + * @depend_tx: 'callback' requires the completion of this transaction + * @cb_fn: function to call after depend_tx completes + * @cb_param: parameter to pass to the callback routine + */ +struct dma_async_tx_descriptor * +async_trigger_callback(enum async_tx_flags flags, + struct dma_async_tx_descriptor *depend_tx, + dma_async_tx_callback cb_fn, void *cb_param) +{ + struct dma_chan *chan; + struct dma_device *device; + struct dma_async_tx_descriptor *tx; + + if (depend_tx) { + chan = depend_tx->chan; + device = chan->device; + + /* see if we can schedule an interrupt + * otherwise poll for completion + */ + if (device && !dma_has_cap(DMA_INTERRUPT, device->cap_mask)) + device = NULL; + + tx = device ? device->device_prep_dma_interrupt(chan) : NULL; + } else + tx = NULL; + + if (tx) { + pr_debug("%s: (async)\n", __FUNCTION__); + + async_tx_submit(chan, tx, flags, depend_tx, cb_fn, cb_param); + } else { + pr_debug("%s: (sync)\n", __FUNCTION__); + + /* wait for any prerequisite operations */ + if (depend_tx) { + /* if ack is already set then we cannot be sure + * we are referring to the correct operation + */ + BUG_ON(depend_tx->ack); + if (dma_wait_for_async_tx(depend_tx) == DMA_ERROR) + panic("%s: DMA_ERROR waiting for depend_tx\n", + __FUNCTION__); + } + + async_tx_sync_epilog(flags, depend_tx, cb_fn, cb_param); + } + + return tx; +} +EXPORT_SYMBOL_GPL(async_trigger_callback); + +module_init(async_tx_init); +module_exit(async_tx_exit); + +MODULE_AUTHOR("Intel Corporation"); +MODULE_DESCRIPTION("Asynchronous Bulk Memory Transactions API"); +MODULE_LICENSE("GPL"); diff --git a/crypto/async_tx/async_xor.c b/crypto/async_tx/async_xor.c new file mode 100644 index 000000000000..2575f674dcd5 --- /dev/null +++ b/crypto/async_tx/async_xor.c @@ -0,0 +1,327 @@ +/* + * xor offload engine api + * + * Copyright © 2006, Intel Corporation. + * + * Dan Williams <dan.j.williams@intel.com> + * + * with architecture considerations by: + * Neil Brown <neilb@suse.de> + * Jeff Garzik <jeff@garzik.org> + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License along with + * this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. + * + */ +#include <linux/kernel.h> +#include <linux/interrupt.h> +#include <linux/mm.h> +#include <linux/dma-mapping.h> +#include <linux/raid/xor.h> +#include <linux/async_tx.h> + +static void +do_async_xor(struct dma_async_tx_descriptor *tx, struct dma_device *device, + struct dma_chan *chan, struct page *dest, struct page **src_list, + unsigned int offset, unsigned int src_cnt, size_t len, + enum async_tx_flags flags, struct dma_async_tx_descriptor *depend_tx, + dma_async_tx_callback cb_fn, void *cb_param) +{ + dma_addr_t dma_addr; + enum dma_data_direction dir; + int i; + + pr_debug("%s: len: %zu\n", __FUNCTION__, len); + + dir = (flags & ASYNC_TX_ASSUME_COHERENT) ? + DMA_NONE : DMA_FROM_DEVICE; + + dma_addr = dma_map_page(device->dev, dest, offset, len, dir); + tx->tx_set_dest(dma_addr, tx, 0); + + dir = (flags & ASYNC_TX_ASSUME_COHERENT) ? + DMA_NONE : DMA_TO_DEVICE; + + for (i = 0; i < src_cnt; i++) { + dma_addr = dma_map_page(device->dev, src_list[i], + offset, len, dir); + tx->tx_set_src(dma_addr, tx, i); + } + + async_tx_submit(chan, tx, flags, depend_tx, cb_fn, cb_param); +} + +static void +do_sync_xor(struct page *dest, struct page **src_list, unsigned int offset, + unsigned int src_cnt, size_t len, enum async_tx_flags flags, + struct dma_async_tx_descriptor *depend_tx, + dma_async_tx_callback cb_fn, void *cb_param) +{ + void *_dest; + int i; + + pr_debug("%s: len: %zu\n", __FUNCTION__, len); + + /* reuse the 'src_list' array to convert to buffer pointers */ + for (i = 0; i < src_cnt; i++) + src_list[i] = (struct page *) + (page_address(src_list[i]) + offset); + + /* set destination address */ + _dest = page_address(dest) + offset; + + if (flags & ASYNC_TX_XOR_ZERO_DST) + memset(_dest, 0, len); + + xor_blocks(src_cnt, len, _dest, + (void **) src_list); + + async_tx_sync_epilog(flags, depend_tx, cb_fn, cb_param); +} + +/** + * async_xor - attempt to xor a set of blocks with a dma engine. + * xor_blocks always uses the dest as a source so the ASYNC_TX_XOR_ZERO_DST + * flag must be set to not include dest data in the calculation. The + * assumption with dma eninges is that they only use the destination + * buffer as a source when it is explicity specified in the source list. + * @dest: destination page + * @src_list: array of source pages (if the dest is also a source it must be + * at index zero). The contents of this array may be overwritten. + * @offset: offset in pages to start transaction + * @src_cnt: number of source pages + * @len: length in bytes + * @flags: ASYNC_TX_XOR_ZERO_DST, ASYNC_TX_XOR_DROP_DEST, + * ASYNC_TX_ASSUME_COHERENT, ASYNC_TX_ACK, ASYNC_TX_DEP_ACK + * @depend_tx: xor depends on the result of this transaction. + * @cb_fn: function to call when the xor completes + * @cb_param: parameter to pass to the callback routine + */ +struct dma_async_tx_descriptor * +async_xor(struct page *dest, struct page **src_list, unsigned int offset, + int src_cnt, size_t len, enum async_tx_flags flags, + struct dma_async_tx_descriptor *depend_tx, + dma_async_tx_callback cb_fn, void *cb_param) +{ + struct dma_chan *chan = async_tx_find_channel(depend_tx, DMA_XOR); + struct dma_device *device = chan ? chan->device : NULL; + struct dma_async_tx_descriptor *tx = NULL; + dma_async_tx_callback _cb_fn; + void *_cb_param; + unsigned long local_flags; + int xor_src_cnt; + int i = 0, src_off = 0, int_en; + + BUG_ON(src_cnt <= 1); + + while (src_cnt) { + local_flags = flags; + if (device) { /* run the xor asynchronously */ + xor_src_cnt = min(src_cnt, device->max_xor); + /* if we are submitting additional xors + * only set the callback on the last transaction + */ + if (src_cnt > xor_src_cnt) { + local_flags &= ~ASYNC_TX_ACK; + _cb_fn = NULL; + _cb_param = NULL; + } else { + _cb_fn = cb_fn; + _cb_param = cb_param; + } + + int_en = _cb_fn ? 1 : 0; + + tx = device->device_prep_dma_xor( + chan, xor_src_cnt, len, int_en); + + if (tx) { + do_async_xor(tx, device, chan, dest, + &src_list[src_off], offset, xor_src_cnt, len, + local_flags, depend_tx, _cb_fn, + _cb_param); + } else /* fall through */ + goto xor_sync; + } else { /* run the xor synchronously */ +xor_sync: + /* in the sync case the dest is an implied source + * (assumes the dest is at the src_off index) + */ + if (flags & ASYNC_TX_XOR_DROP_DST) { + src_cnt--; + src_off++; + } + + /* process up to 'MAX_XOR_BLOCKS' sources */ + xor_src_cnt = min(src_cnt, MAX_XOR_BLOCKS); + + /* if we are submitting additional xors + * only set the callback on the last transaction + */ + if (src_cnt > xor_src_cnt) { + local_flags &= ~ASYNC_TX_ACK; + _cb_fn = NULL; + _cb_param = NULL; + } else { + _cb_fn = cb_fn; + _cb_param = cb_param; + } + + /* wait for any prerequisite operations */ + if (depend_tx) { + /* if ack is already set then we cannot be sure + * we are referring to the correct operation + */ + BUG_ON(depend_tx->ack); + if (dma_wait_for_async_tx(depend_tx) == + DMA_ERROR) + panic("%s: DMA_ERROR waiting for " + "depend_tx\n", + __FUNCTION__); + } + + do_sync_xor(dest, &src_list[src_off], offset, + xor_src_cnt, len, local_flags, depend_tx, + _cb_fn, _cb_param); + } + + /* the previous tx is hidden from the client, + * so ack it + */ + if (i && depend_tx) + async_tx_ack(depend_tx); + + depend_tx = tx; + + if (src_cnt > xor_src_cnt) { + /* drop completed sources */ + src_cnt -= xor_src_cnt; + src_off += xor_src_cnt; + + /* unconditionally preserve the destination */ + flags &= ~ASYNC_TX_XOR_ZERO_DST; + + /* use the intermediate result a source, but remember + * it's dropped, because it's implied, in the sync case + */ + src_list[--src_off] = dest; + src_cnt++; + flags |= ASYNC_TX_XOR_DROP_DST; + } else + src_cnt = 0; + i++; + } + + return tx; +} +EXPORT_SYMBOL_GPL(async_xor); + +static int page_is_zero(struct page *p, unsigned int offset, size_t len) +{ + char *a = page_address(p) + offset; + return ((*(u32 *) a) == 0 && + memcmp(a, a + 4, len - 4) == 0); +} + +/** + * async_xor_zero_sum - attempt a xor parity check with a dma engine. + * @dest: destination page used if the xor is performed synchronously + * @src_list: array of source pages. The dest page must be listed as a source + * at index zero. The contents of this array may be overwritten. + * @offset: offset in pages to start transaction + * @src_cnt: number of source pages + * @len: length in bytes + * @result: 0 if sum == 0 else non-zero + * @flags: ASYNC_TX_ASSUME_COHERENT, ASYNC_TX_ACK, ASYNC_TX_DEP_ACK + * @depend_tx: xor depends on the result of this transaction. + * @cb_fn: function to call when the xor completes + * @cb_param: parameter to pass to the callback routine + */ +struct dma_async_tx_descriptor * +async_xor_zero_sum(struct page *dest, struct page **src_list, + unsigned int offset, int src_cnt, size_t len, + u32 *result, enum async_tx_flags flags, + struct dma_async_tx_descriptor *depend_tx, + dma_async_tx_callback cb_fn, void *cb_param) +{ + struct dma_chan *chan = async_tx_find_channel(depend_tx, DMA_ZERO_SUM); + struct dma_device *device = chan ? chan->device : NULL; + int int_en = cb_fn ? 1 : 0; + struct dma_async_tx_descriptor *tx = device ? + device->device_prep_dma_zero_sum(chan, src_cnt, len, result, + int_en) : NULL; + int i; + + BUG_ON(src_cnt <= 1); + + if (tx) { + dma_addr_t dma_addr; + enum dma_data_direction dir; + + pr_debug("%s: (async) len: %zu\n", __FUNCTION__, len); + + dir = (flags & ASYNC_TX_ASSUME_COHERENT) ? + DMA_NONE : DMA_TO_DEVICE; + + for (i = 0; i < src_cnt; i++) { + dma_addr = dma_map_page(device->dev, src_list[i], + offset, len, dir); + tx->tx_set_src(dma_addr, tx, i); + } + + async_tx_submit(chan, tx, flags, depend_tx, cb_fn, cb_param); + } else { + unsigned long xor_flags = flags; + + pr_debug("%s: (sync) len: %zu\n", __FUNCTION__, len); + + xor_flags |= ASYNC_TX_XOR_DROP_DST; + xor_flags &= ~ASYNC_TX_ACK; + + tx = async_xor(dest, src_list, offset, src_cnt, len, xor_flags, + depend_tx, NULL, NULL); + + if (tx) { + if (dma_wait_for_async_tx(tx) == DMA_ERROR) + panic("%s: DMA_ERROR waiting for tx\n", + __FUNCTION__); + async_tx_ack(tx); + } + + *result = page_is_zero(dest, offset, len) ? 0 : 1; + + tx = NULL; + + async_tx_sync_epilog(flags, depend_tx, cb_fn, cb_param); + } + + return tx; +} +EXPORT_SYMBOL_GPL(async_xor_zero_sum); + +static int __init async_xor_init(void) +{ + return 0; +} + +static void __exit async_xor_exit(void) +{ + do { } while (0); +} + +module_init(async_xor_init); +module_exit(async_xor_exit); + +MODULE_AUTHOR("Intel Corporation"); +MODULE_DESCRIPTION("asynchronous xor/xor-zero-sum api"); +MODULE_LICENSE("GPL"); |