]>
git.proxmox.com Git - mirror_ubuntu-artful-kernel.git/blob - crypto/async_tx/async_memset.c
2 * memory fill offload engine support
4 * Copyright © 2006, Intel Corporation.
6 * Dan Williams <dan.j.williams@intel.com>
8 * with architecture considerations by:
9 * Neil Brown <neilb@suse.de>
10 * Jeff Garzik <jeff@garzik.org>
12 * This program is free software; you can redistribute it and/or modify it
13 * under the terms and conditions of the GNU General Public License,
14 * version 2, as published by the Free Software Foundation.
16 * This program is distributed in the hope it will be useful, but WITHOUT
17 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
18 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
21 * You should have received a copy of the GNU General Public License along with
22 * this program; if not, write to the Free Software Foundation, Inc.,
23 * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
26 #include <linux/kernel.h>
27 #include <linux/interrupt.h>
29 #include <linux/dma-mapping.h>
30 #include <linux/async_tx.h>
33 * async_memset - attempt to fill memory with a dma engine.
34 * @dest: destination page
36 * @offset: offset in pages to start transaction
37 * @len: length in bytes
39 * honored flags: ASYNC_TX_ACK
41 struct dma_async_tx_descriptor
*
42 async_memset(struct page
*dest
, int val
, unsigned int offset
, size_t len
,
43 struct async_submit_ctl
*submit
)
45 struct dma_chan
*chan
= async_tx_find_channel(submit
, DMA_MEMSET
,
46 &dest
, 1, NULL
, 0, len
);
47 struct dma_device
*device
= chan
? chan
->device
: NULL
;
48 struct dma_async_tx_descriptor
*tx
= NULL
;
52 unsigned long dma_prep_flags
;
54 dma_prep_flags
= submit
->cb_fn
? DMA_PREP_INTERRUPT
: 0;
55 dma_dest
= dma_map_page(device
->dev
, dest
, offset
, len
,
58 tx
= device
->device_prep_dma_memset(chan
, dma_dest
, val
, len
,
63 pr_debug("%s: (async) len: %zu\n", __func__
, len
);
64 async_tx_submit(chan
, tx
, submit
);
65 } else { /* run the memset synchronously */
67 pr_debug("%s: (sync) len: %zu\n", __func__
, len
);
69 dest_buf
= page_address(dest
) + offset
;
71 /* wait for any prerequisite operations */
72 async_tx_quiesce(&submit
->depend_tx
);
74 memset(dest_buf
, val
, len
);
76 async_tx_sync_epilog(submit
);
81 EXPORT_SYMBOL_GPL(async_memset
);
83 MODULE_AUTHOR("Intel Corporation");
84 MODULE_DESCRIPTION("asynchronous memset api");
85 MODULE_LICENSE("GPL");