diff options
Diffstat (limited to 'crypto/async_tx/async_xor.c')
| -rw-r--r-- | crypto/async_tx/async_xor.c | 126 |
1 files changed, 107 insertions, 19 deletions
diff --git a/crypto/async_tx/async_xor.c b/crypto/async_tx/async_xor.c index 4e5eebe52e6a..1a3855284091 100644 --- a/crypto/async_tx/async_xor.c +++ b/crypto/async_tx/async_xor.c @@ -97,7 +97,8 @@ do_async_xor(struct dma_chan *chan, struct dmaengine_unmap_data *unmap, } static void -do_sync_xor(struct page *dest, struct page **src_list, unsigned int offset, +do_sync_xor_offs(struct page *dest, unsigned int offset, + struct page **src_list, unsigned int *src_offs, int src_cnt, size_t len, struct async_submit_ctl *submit) { int i; @@ -114,7 +115,8 @@ do_sync_xor(struct page *dest, struct page **src_list, unsigned int offset, /* convert to buffer pointers */ for (i = 0; i < src_cnt; i++) if (src_list[i]) - srcs[xor_src_cnt++] = page_address(src_list[i]) + offset; + srcs[xor_src_cnt++] = page_address(src_list[i]) + + (src_offs ? src_offs[i] : offset); src_cnt = xor_src_cnt; /* set destination address */ dest_buf = page_address(dest) + offset; @@ -135,11 +137,31 @@ do_sync_xor(struct page *dest, struct page **src_list, unsigned int offset, async_tx_sync_epilog(submit); } +static inline bool +dma_xor_aligned_offsets(struct dma_device *device, unsigned int offset, + unsigned int *src_offs, int src_cnt, int len) +{ + int i; + + if (!is_dma_xor_aligned(device, offset, 0, len)) + return false; + + if (!src_offs) + return true; + + for (i = 0; i < src_cnt; i++) { + if (!is_dma_xor_aligned(device, src_offs[i], 0, len)) + return false; + } + return true; +} + /** - * async_xor - attempt to xor a set of blocks with a dma engine. + * async_xor_offs - attempt to xor a set of blocks with a dma engine. * @dest: destination page + * @offset: dst offset to start transaction * @src_list: array of source pages - * @offset: common src/dst offset to start transaction + * @src_offs: array of source pages offset, NULL means common src/dst offset * @src_cnt: number of source pages * @len: length in bytes * @submit: submission / completion modifiers @@ -148,8 +170,8 @@ do_sync_xor(struct page *dest, struct page **src_list, unsigned int offset, * * 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 + * the calculation. The assumption with dma engines is that they only + * use the destination buffer as a source when it is explicitly specified * in the source list. * * src_list note: if the dest is also a source it must be at index zero. @@ -157,8 +179,9 @@ do_sync_xor(struct page *dest, struct page **src_list, unsigned int offset, * is not specified. */ struct dma_async_tx_descriptor * -async_xor(struct page *dest, struct page **src_list, unsigned int offset, - int src_cnt, size_t len, struct async_submit_ctl *submit) +async_xor_offs(struct page *dest, unsigned int offset, + struct page **src_list, unsigned int *src_offs, + int src_cnt, size_t len, struct async_submit_ctl *submit) { struct dma_chan *chan = async_tx_find_channel(submit, DMA_XOR, &dest, 1, src_list, @@ -171,7 +194,8 @@ async_xor(struct page *dest, struct page **src_list, unsigned int offset, if (device) unmap = dmaengine_get_unmap_data(device->dev, src_cnt+1, GFP_NOWAIT); - if (unmap && is_dma_xor_aligned(device, offset, 0, len)) { + if (unmap && dma_xor_aligned_offsets(device, offset, + src_offs, src_cnt, len)) { struct dma_async_tx_descriptor *tx; int i, j; @@ -184,7 +208,8 @@ async_xor(struct page *dest, struct page **src_list, unsigned int offset, continue; unmap->to_cnt++; unmap->addr[j++] = dma_map_page(device->dev, src_list[i], - offset, len, DMA_TO_DEVICE); + src_offs ? src_offs[i] : offset, + len, DMA_TO_DEVICE); } /* map it bidirectional as it may be re-used as a source */ @@ -208,16 +233,49 @@ async_xor(struct page *dest, struct page **src_list, unsigned int offset, if (submit->flags & ASYNC_TX_XOR_DROP_DST) { src_cnt--; src_list++; + if (src_offs) + src_offs++; } /* wait for any prerequisite operations */ async_tx_quiesce(&submit->depend_tx); - do_sync_xor(dest, src_list, offset, src_cnt, len, submit); + do_sync_xor_offs(dest, offset, src_list, src_offs, + src_cnt, len, submit); return NULL; } } +EXPORT_SYMBOL_GPL(async_xor_offs); + +/** + * async_xor - attempt to xor a set of blocks with a dma engine. + * @dest: destination page + * @src_list: array of source pages + * @offset: common src/dst offset to start transaction + * @src_cnt: number of source pages + * @len: length in bytes + * @submit: submission / completion modifiers + * + * honored flags: ASYNC_TX_ACK, ASYNC_TX_XOR_ZERO_DST, ASYNC_TX_XOR_DROP_DST + * + * 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 engines is that they only + * use the destination buffer as a source when it is explicitly specified + * in the source list. + * + * src_list note: if the dest is also a source it must be at index zero. + * The contents of this array will be overwritten if a scribble region + * is not specified. + */ +struct dma_async_tx_descriptor * +async_xor(struct page *dest, struct page **src_list, unsigned int offset, + int src_cnt, size_t len, struct async_submit_ctl *submit) +{ + return async_xor_offs(dest, offset, src_list, NULL, + src_cnt, len, submit); +} EXPORT_SYMBOL_GPL(async_xor); static int page_is_zero(struct page *p, unsigned int offset, size_t len) @@ -237,10 +295,11 @@ xor_val_chan(struct async_submit_ctl *submit, struct page *dest, } /** - * async_xor_val - attempt a xor parity check with a dma engine. + * async_xor_val_offs - attempt a xor parity check with a dma engine. * @dest: destination page used if the xor is performed synchronously + * @offset: des offset in pages to start transaction * @src_list: array of source pages - * @offset: offset in pages to start transaction + * @src_offs: array of source pages offset, NULL means common src/det offset * @src_cnt: number of source pages * @len: length in bytes * @result: 0 if sum == 0 else non-zero @@ -253,9 +312,10 @@ xor_val_chan(struct async_submit_ctl *submit, struct page *dest, * is not specified. */ struct dma_async_tx_descriptor * -async_xor_val(struct page *dest, struct page **src_list, unsigned int offset, - int src_cnt, size_t len, enum sum_check_flags *result, - struct async_submit_ctl *submit) +async_xor_val_offs(struct page *dest, unsigned int offset, + struct page **src_list, unsigned int *src_offs, + int src_cnt, size_t len, enum sum_check_flags *result, + struct async_submit_ctl *submit) { struct dma_chan *chan = xor_val_chan(submit, dest, src_list, src_cnt, len); struct dma_device *device = chan ? chan->device : NULL; @@ -268,7 +328,7 @@ async_xor_val(struct page *dest, struct page **src_list, unsigned int offset, unmap = dmaengine_get_unmap_data(device->dev, src_cnt, GFP_NOWAIT); if (unmap && src_cnt <= device->max_xor && - is_dma_xor_aligned(device, offset, 0, len)) { + dma_xor_aligned_offsets(device, offset, src_offs, src_cnt, len)) { unsigned long dma_prep_flags = 0; int i; @@ -281,7 +341,8 @@ async_xor_val(struct page *dest, struct page **src_list, unsigned int offset, for (i = 0; i < src_cnt; i++) { unmap->addr[i] = dma_map_page(device->dev, src_list[i], - offset, len, DMA_TO_DEVICE); + src_offs ? src_offs[i] : offset, + len, DMA_TO_DEVICE); unmap->to_cnt++; } unmap->len = len; @@ -312,7 +373,8 @@ async_xor_val(struct page *dest, struct page **src_list, unsigned int offset, submit->flags |= ASYNC_TX_XOR_DROP_DST; submit->flags &= ~ASYNC_TX_ACK; - tx = async_xor(dest, src_list, offset, src_cnt, len, submit); + tx = async_xor_offs(dest, offset, src_list, src_offs, + src_cnt, len, submit); async_tx_quiesce(&tx); @@ -325,6 +387,32 @@ async_xor_val(struct page *dest, struct page **src_list, unsigned int offset, return tx; } +EXPORT_SYMBOL_GPL(async_xor_val_offs); + +/** + * async_xor_val - 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 + * @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 + * @submit: submission / completion modifiers + * + * honored flags: ASYNC_TX_ACK + * + * src_list note: if the dest is also a source it must be at index zero. + * The contents of this array will be overwritten if a scribble region + * is not specified. + */ +struct dma_async_tx_descriptor * +async_xor_val(struct page *dest, struct page **src_list, unsigned int offset, + int src_cnt, size_t len, enum sum_check_flags *result, + struct async_submit_ctl *submit) +{ + return async_xor_val_offs(dest, offset, src_list, NULL, src_cnt, + len, result, submit); +} EXPORT_SYMBOL_GPL(async_xor_val); MODULE_AUTHOR("Intel Corporation"); |