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TOMOYO Linux Cross Reference
Linux/crypto/async_tx/async_memset.c

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  1 /*
  2  * memory fill offload engine support
  3  *
  4  * Copyright © 2006, Intel Corporation.
  5  *
  6  *      Dan Williams <dan.j.williams@intel.com>
  7  *
  8  *      with architecture considerations by:
  9  *      Neil Brown <neilb@suse.de>
 10  *      Jeff Garzik <jeff@garzik.org>
 11  *
 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.
 15  *
 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
 19  * more details.
 20  *
 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.
 24  *
 25  */
 26 #include <linux/kernel.h>
 27 #include <linux/interrupt.h>
 28 #include <linux/mm.h>
 29 #include <linux/dma-mapping.h>
 30 #include <linux/async_tx.h>
 31 
 32 /**
 33  * async_memset - attempt to fill memory with a dma engine.
 34  * @dest: destination page
 35  * @val: fill value
 36  * @offset: offset in pages to start transaction
 37  * @len: length in bytes
 38  *
 39  * honored flags: ASYNC_TX_ACK
 40  */
 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)
 44 {
 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;
 49 
 50         if (device && is_dma_fill_aligned(device, offset, 0, len)) {
 51                 dma_addr_t dma_dest;
 52                 unsigned long dma_prep_flags = 0;
 53 
 54                 if (submit->cb_fn)
 55                         dma_prep_flags |= DMA_PREP_INTERRUPT;
 56                 if (submit->flags & ASYNC_TX_FENCE)
 57                         dma_prep_flags |= DMA_PREP_FENCE;
 58                 dma_dest = dma_map_page(device->dev, dest, offset, len,
 59                                         DMA_FROM_DEVICE);
 60 
 61                 tx = device->device_prep_dma_memset(chan, dma_dest, val, len,
 62                                                     dma_prep_flags);
 63         }
 64 
 65         if (tx) {
 66                 pr_debug("%s: (async) len: %zu\n", __func__, len);
 67                 async_tx_submit(chan, tx, submit);
 68         } else { /* run the memset synchronously */
 69                 void *dest_buf;
 70                 pr_debug("%s: (sync) len: %zu\n", __func__, len);
 71 
 72                 dest_buf = page_address(dest) + offset;
 73 
 74                 /* wait for any prerequisite operations */
 75                 async_tx_quiesce(&submit->depend_tx);
 76 
 77                 memset(dest_buf, val, len);
 78 
 79                 async_tx_sync_epilog(submit);
 80         }
 81 
 82         return tx;
 83 }
 84 EXPORT_SYMBOL_GPL(async_memset);
 85 
 86 MODULE_AUTHOR("Intel Corporation");
 87 MODULE_DESCRIPTION("asynchronous memset api");
 88 MODULE_LICENSE("GPL");
 89 

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