diff options
Diffstat (limited to 'crypto/async_tx')
-rw-r--r-- | crypto/async_tx/async_xor.c | 60 |
1 files changed, 29 insertions, 31 deletions
diff --git a/crypto/async_tx/async_xor.c b/crypto/async_tx/async_xor.c index 691fa98..1e96c4d 100644 --- a/crypto/async_tx/async_xor.c +++ b/crypto/async_tx/async_xor.c @@ -33,11 +33,10 @@ /* do_async_xor - dma map the pages and perform the xor with an engine */ static __async_inline struct dma_async_tx_descriptor * do_async_xor(struct dma_chan *chan, struct page *dest, struct page **src_list, - unsigned int offset, int src_cnt, size_t len, + unsigned int offset, int src_cnt, size_t len, dma_addr_t *dma_src, struct async_submit_ctl *submit) { struct dma_device *dma = chan->device; - dma_addr_t *dma_src = (dma_addr_t *) src_list; struct dma_async_tx_descriptor *tx = NULL; int src_off = 0; int i; @@ -125,9 +124,14 @@ do_sync_xor(struct page *dest, struct page **src_list, unsigned int offset, int xor_src_cnt; int src_off = 0; void *dest_buf; - void **srcs = (void **) src_list; + void **srcs; - /* reuse the 'src_list' array to convert to buffer pointers */ + if (submit->scribble) + srcs = submit->scribble; + else + srcs = (void **) src_list; + + /* convert to buffer pointers */ for (i = 0; i < src_cnt; i++) srcs[i] = page_address(src_list[i]) + offset; @@ -178,17 +182,26 @@ async_xor(struct page *dest, struct page **src_list, unsigned int offset, struct dma_chan *chan = async_tx_find_channel(submit, DMA_XOR, &dest, 1, src_list, src_cnt, len); + dma_addr_t *dma_src = NULL; + BUG_ON(src_cnt <= 1); - if (chan) { + if (submit->scribble) + dma_src = submit->scribble; + else if (sizeof(dma_addr_t) <= sizeof(struct page *)) + dma_src = (dma_addr_t *) src_list; + + if (dma_src && chan) { /* run the xor asynchronously */ pr_debug("%s (async): len: %zu\n", __func__, len); return do_async_xor(chan, dest, src_list, offset, src_cnt, len, - submit); + dma_src, submit); } else { /* run the xor synchronously */ pr_debug("%s (sync): len: %zu\n", __func__, len); + WARN_ONCE(chan, "%s: no space for dma address conversion\n", + __func__); /* in the sync case the dest is an implied source * (assumes the dest is the first source) @@ -241,11 +254,16 @@ async_xor_val(struct page *dest, struct page **src_list, unsigned int offset, src_cnt, len); struct dma_device *device = chan ? chan->device : NULL; struct dma_async_tx_descriptor *tx = NULL; + dma_addr_t *dma_src = NULL; BUG_ON(src_cnt <= 1); - if (device && src_cnt <= device->max_xor) { - dma_addr_t *dma_src = (dma_addr_t *) src_list; + if (submit->scribble) + dma_src = submit->scribble; + else if (sizeof(dma_addr_t) <= sizeof(struct page *)) + dma_src = (dma_addr_t *) src_list; + + if (dma_src && device && src_cnt <= device->max_xor) { unsigned long dma_prep_flags; int i; @@ -275,6 +293,9 @@ async_xor_val(struct page *dest, struct page **src_list, unsigned int offset, enum async_tx_flags flags_orig = submit->flags; pr_debug("%s: (sync) len: %zu\n", __func__, len); + WARN_ONCE(device && src_cnt <= device->max_xor, + "%s: no space for dma address conversion\n", + __func__); submit->flags |= ASYNC_TX_XOR_DROP_DST; submit->flags &= ~ASYNC_TX_ACK; @@ -293,29 +314,6 @@ async_xor_val(struct page *dest, struct page **src_list, unsigned int offset, } EXPORT_SYMBOL_GPL(async_xor_val); -static int __init async_xor_init(void) -{ - #ifdef CONFIG_DMA_ENGINE - /* To conserve stack space the input src_list (array of page pointers) - * is reused to hold the array of dma addresses passed to the driver. - * This conversion is only possible when dma_addr_t is less than the - * the size of a pointer. HIGHMEM64G is known to violate this - * assumption. - */ - BUILD_BUG_ON(sizeof(dma_addr_t) > sizeof(struct page *)); - #endif - - 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"); |