From 099f53cb50e45ef617a9f1d63ceec799e489418b Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Wed, 8 Apr 2009 14:28:37 -0700 Subject: async_tx: rename zero_sum to val 'zero_sum' does not properly describe the operation of generating parity and checking that it validates against an existing buffer. Change the name of the operation to 'val' (for 'validate'). This is in anticipation of the p+q case where it is a requirement to identify the target parity buffers separately from the source buffers, because the target parity buffers will not have corresponding pq coefficients. Reviewed-by: Andre Noll Acked-by: Maciej Sosnowski Signed-off-by: Dan Williams --- crypto/async_tx/async_xor.c | 16 ++++++++-------- 1 file changed, 8 insertions(+), 8 deletions(-) (limited to 'crypto') diff --git a/crypto/async_tx/async_xor.c b/crypto/async_tx/async_xor.c index 95fe2c8d6c51..e0580b0ea533 100644 --- a/crypto/async_tx/async_xor.c +++ b/crypto/async_tx/async_xor.c @@ -222,7 +222,7 @@ static int page_is_zero(struct page *p, unsigned int offset, size_t len) } /** - * async_xor_zero_sum - attempt a xor parity check with a dma engine. + * 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. The dest page must be listed as a source * at index zero. The contents of this array may be overwritten. @@ -236,13 +236,13 @@ static int page_is_zero(struct page *p, unsigned int offset, size_t len) * @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, +async_xor_val(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_chan *chan = async_tx_find_channel(depend_tx, DMA_XOR_VAL, &dest, 1, src_list, src_cnt, len); struct dma_device *device = chan ? chan->device : NULL; @@ -261,15 +261,15 @@ async_xor_zero_sum(struct page *dest, struct page **src_list, dma_src[i] = dma_map_page(device->dev, src_list[i], offset, len, DMA_TO_DEVICE); - tx = device->device_prep_dma_zero_sum(chan, dma_src, src_cnt, - len, result, - dma_prep_flags); + tx = device->device_prep_dma_xor_val(chan, dma_src, src_cnt, + len, result, + dma_prep_flags); if (unlikely(!tx)) { async_tx_quiesce(&depend_tx); while (!tx) { dma_async_issue_pending(chan); - tx = device->device_prep_dma_zero_sum(chan, + tx = device->device_prep_dma_xor_val(chan, dma_src, src_cnt, len, result, dma_prep_flags); } @@ -296,7 +296,7 @@ async_xor_zero_sum(struct page *dest, struct page **src_list, return tx; } -EXPORT_SYMBOL_GPL(async_xor_zero_sum); +EXPORT_SYMBOL_GPL(async_xor_val); static int __init async_xor_init(void) { -- cgit v1.2.3 From 88ba2aa586c874681c072101287e15d40de7e6e2 Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Thu, 9 Apr 2009 16:16:18 -0700 Subject: async_tx: kill ASYNC_TX_DEP_ACK flag In support of inter-channel chaining async_tx utilizes an ack flag to gate whether a dependent operation can be chained to another. While the flag is not set the chain can be considered open for appending. Setting the ack flag closes the chain and flags the descriptor for garbage collection. The ASYNC_TX_DEP_ACK flag essentially means "close the chain after adding this dependency". Since each operation can only have one child the api now implicitly sets the ack flag at dependency submission time. This removes an unnecessary management burden from clients of the api. [ Impact: clean up and enforce one dependency per operation ] Reviewed-by: Andre Noll Acked-by: Maciej Sosnowski Signed-off-by: Dan Williams --- Documentation/crypto/async-tx-api.txt | 9 ++++----- crypto/async_tx/async_memcpy.c | 2 +- crypto/async_tx/async_memset.c | 2 +- crypto/async_tx/async_tx.c | 4 ++-- crypto/async_tx/async_xor.c | 6 ++---- drivers/md/raid5.c | 25 +++++++++++-------------- include/linux/async_tx.h | 4 +--- 7 files changed, 22 insertions(+), 30 deletions(-) (limited to 'crypto') diff --git a/Documentation/crypto/async-tx-api.txt b/Documentation/crypto/async-tx-api.txt index 4af12180d191..76feda8541dc 100644 --- a/Documentation/crypto/async-tx-api.txt +++ b/Documentation/crypto/async-tx-api.txt @@ -80,8 +80,8 @@ acknowledged by the application before the offload engine driver is allowed to recycle (or free) the descriptor. A descriptor can be acked by one of the following methods: 1/ setting the ASYNC_TX_ACK flag if no child operations are to be submitted -2/ setting the ASYNC_TX_DEP_ACK flag to acknowledge the parent - descriptor of a new operation. +2/ submitting an unacknowledged descriptor as a dependency to another + async_tx call will implicitly set the acknowledged state. 3/ calling async_tx_ack() on the descriptor. 3.4 When does the operation execute? @@ -136,10 +136,9 @@ int run_xor_copy_xor(struct page **xor_srcs, tx = async_xor(xor_dest, xor_srcs, 0, xor_src_cnt, xor_len, ASYNC_TX_XOR_DROP_DST, NULL, NULL, NULL); - tx = async_memcpy(copy_dest, copy_src, 0, 0, copy_len, - ASYNC_TX_DEP_ACK, tx, NULL, NULL); + tx = async_memcpy(copy_dest, copy_src, 0, 0, copy_len, tx, NULL, NULL); tx = async_xor(xor_dest, xor_srcs, 0, xor_src_cnt, xor_len, - ASYNC_TX_XOR_DROP_DST | ASYNC_TX_DEP_ACK | ASYNC_TX_ACK, + ASYNC_TX_XOR_DROP_DST | ASYNC_TX_ACK, tx, complete_xor_copy_xor, NULL); async_tx_issue_pending_all(); diff --git a/crypto/async_tx/async_memcpy.c b/crypto/async_tx/async_memcpy.c index ddccfb01c416..7117ec6f1b74 100644 --- a/crypto/async_tx/async_memcpy.c +++ b/crypto/async_tx/async_memcpy.c @@ -35,7 +35,7 @@ * @src: src page * @offset: offset in pages to start transaction * @len: length in bytes - * @flags: ASYNC_TX_ACK, ASYNC_TX_DEP_ACK, + * @flags: ASYNC_TX_ACK * @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 diff --git a/crypto/async_tx/async_memset.c b/crypto/async_tx/async_memset.c index 5b5eb99bb244..b2f133885b7f 100644 --- a/crypto/async_tx/async_memset.c +++ b/crypto/async_tx/async_memset.c @@ -35,7 +35,7 @@ * @val: fill value * @offset: offset in pages to start transaction * @len: length in bytes - * @flags: ASYNC_TX_ACK, ASYNC_TX_DEP_ACK + * @flags: ASYNC_TX_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 diff --git a/crypto/async_tx/async_tx.c b/crypto/async_tx/async_tx.c index 06eb6cc09fef..3766bc3d7d89 100644 --- a/crypto/async_tx/async_tx.c +++ b/crypto/async_tx/async_tx.c @@ -223,7 +223,7 @@ async_tx_submit(struct dma_chan *chan, struct dma_async_tx_descriptor *tx, if (flags & ASYNC_TX_ACK) async_tx_ack(tx); - if (depend_tx && (flags & ASYNC_TX_DEP_ACK)) + if (depend_tx) async_tx_ack(depend_tx); } EXPORT_SYMBOL_GPL(async_tx_submit); @@ -231,7 +231,7 @@ 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 + * @flags: ASYNC_TX_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 diff --git a/crypto/async_tx/async_xor.c b/crypto/async_tx/async_xor.c index e0580b0ea533..3cc5dc763b54 100644 --- a/crypto/async_tx/async_xor.c +++ b/crypto/async_tx/async_xor.c @@ -105,7 +105,6 @@ do_async_xor(struct dma_chan *chan, struct page *dest, struct page **src_list, _cb_param); depend_tx = tx; - flags |= ASYNC_TX_DEP_ACK; if (src_cnt > xor_src_cnt) { /* drop completed sources */ @@ -168,8 +167,7 @@ do_sync_xor(struct page *dest, struct page **src_list, unsigned int offset, * @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_ACK, ASYNC_TX_DEP_ACK + * @flags: ASYNC_TX_XOR_ZERO_DST, ASYNC_TX_XOR_DROP_DEST, ASYNC_TX_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 @@ -230,7 +228,7 @@ static int page_is_zero(struct page *p, unsigned int offset, size_t len) * @src_cnt: number of source pages * @len: length in bytes * @result: 0 if sum == 0 else non-zero - * @flags: ASYNC_TX_ACK, ASYNC_TX_DEP_ACK + * @flags: ASYNC_TX_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 diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c index f8d2d35ed298..0ef5362c8d02 100644 --- a/drivers/md/raid5.c +++ b/drivers/md/raid5.c @@ -525,14 +525,12 @@ async_copy_data(int frombio, struct bio *bio, struct page *page, bio_page = bio_iovec_idx(bio, i)->bv_page; if (frombio) tx = async_memcpy(page, bio_page, page_offset, - b_offset, clen, - ASYNC_TX_DEP_ACK, - tx, NULL, NULL); + b_offset, clen, 0, + tx, NULL, NULL); else tx = async_memcpy(bio_page, page, b_offset, - page_offset, clen, - ASYNC_TX_DEP_ACK, - tx, NULL, NULL); + page_offset, clen, 0, + tx, NULL, NULL); } if (clen < len) /* hit end of page */ break; @@ -615,8 +613,7 @@ static void ops_run_biofill(struct stripe_head *sh) } atomic_inc(&sh->count); - async_trigger_callback(ASYNC_TX_DEP_ACK | ASYNC_TX_ACK, tx, - ops_complete_biofill, sh); + async_trigger_callback(ASYNC_TX_ACK, tx, ops_complete_biofill, sh); } static void ops_complete_compute5(void *stripe_head_ref) @@ -701,8 +698,8 @@ ops_run_prexor(struct stripe_head *sh, struct dma_async_tx_descriptor *tx) } tx = async_xor(xor_dest, xor_srcs, 0, count, STRIPE_SIZE, - ASYNC_TX_DEP_ACK | ASYNC_TX_XOR_DROP_DST, tx, - ops_complete_prexor, sh); + ASYNC_TX_XOR_DROP_DST, tx, + ops_complete_prexor, sh); return tx; } @@ -809,7 +806,7 @@ ops_run_postxor(struct stripe_head *sh, struct dma_async_tx_descriptor *tx) * set ASYNC_TX_XOR_DROP_DST and ASYNC_TX_XOR_ZERO_DST * for the synchronous xor case */ - flags = ASYNC_TX_DEP_ACK | ASYNC_TX_ACK | + flags = ASYNC_TX_ACK | (prexor ? ASYNC_TX_XOR_DROP_DST : ASYNC_TX_XOR_ZERO_DST); atomic_inc(&sh->count); @@ -858,7 +855,7 @@ static void ops_run_check(struct stripe_head *sh) &sh->ops.zero_sum_result, 0, NULL, NULL, NULL); atomic_inc(&sh->count); - tx = async_trigger_callback(ASYNC_TX_DEP_ACK | ASYNC_TX_ACK, tx, + tx = async_trigger_callback(ASYNC_TX_ACK, tx, ops_complete_check, sh); } @@ -2687,8 +2684,8 @@ static void handle_stripe_expansion(raid5_conf_t *conf, struct stripe_head *sh, /* place all the copies on one channel */ tx = async_memcpy(sh2->dev[dd_idx].page, - sh->dev[i].page, 0, 0, STRIPE_SIZE, - ASYNC_TX_DEP_ACK, tx, NULL, NULL); + sh->dev[i].page, 0, 0, STRIPE_SIZE, + 0, tx, NULL, NULL); set_bit(R5_Expanded, &sh2->dev[dd_idx].flags); set_bit(R5_UPTODATE, &sh2->dev[dd_idx].flags); diff --git a/include/linux/async_tx.h b/include/linux/async_tx.h index 513150d8c25b..9f14cd540cd2 100644 --- a/include/linux/async_tx.h +++ b/include/linux/async_tx.h @@ -58,13 +58,11 @@ struct dma_chan_ref { * array. * @ASYNC_TX_ACK: immediately ack the descriptor, precludes setting up a * dependency chain - * @ASYNC_TX_DEP_ACK: ack the dependency descriptor. Useful for chaining. */ enum async_tx_flags { ASYNC_TX_XOR_ZERO_DST = (1 << 0), ASYNC_TX_XOR_DROP_DST = (1 << 1), - ASYNC_TX_ACK = (1 << 3), - ASYNC_TX_DEP_ACK = (1 << 4), + ASYNC_TX_ACK = (1 << 2), }; #ifdef CONFIG_DMA_ENGINE -- cgit v1.2.3 From a08abd8ca890a377521d65d493d174bebcaf694b Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Wed, 3 Jun 2009 11:43:59 -0700 Subject: async_tx: structify submission arguments, add scribble Prepare the api for the arrival of a new parameter, 'scribble'. This will allow callers to identify scratchpad memory for dma address or page address conversions. As this adds yet another parameter, take this opportunity to convert the common submission parameters (flags, dependency, callback, and callback argument) into an object that is passed by reference. Also, take this opportunity to fix up the kerneldoc and add notes about the relevant ASYNC_TX_* flags for each routine. [ Impact: moves api pass-by-value parameters to a pass-by-reference struct ] Signed-off-by: Andre Noll Acked-by: Maciej Sosnowski Signed-off-by: Dan Williams --- Documentation/crypto/async-tx-api.txt | 6 +- crypto/async_tx/async_memcpy.c | 26 +++---- crypto/async_tx/async_memset.c | 25 +++---- crypto/async_tx/async_tx.c | 51 +++++++------- crypto/async_tx/async_xor.c | 123 +++++++++++++++++----------------- drivers/md/raid5.c | 59 +++++++++------- include/linux/async_tx.h | 84 ++++++++++++++--------- 7 files changed, 200 insertions(+), 174 deletions(-) (limited to 'crypto') diff --git a/Documentation/crypto/async-tx-api.txt b/Documentation/crypto/async-tx-api.txt index 76feda8541dc..dfe0475f7919 100644 --- a/Documentation/crypto/async-tx-api.txt +++ b/Documentation/crypto/async-tx-api.txt @@ -54,11 +54,7 @@ features surfaced as a result: 3.1 General format of the API: struct dma_async_tx_descriptor * -async_(, - enum async_tx_flags flags, - struct dma_async_tx_descriptor *dependency, - dma_async_tx_callback callback_routine, - void *callback_parameter); +async_(, struct async_submit ctl *submit) 3.2 Supported operations: memcpy - memory copy between a source and a destination buffer diff --git a/crypto/async_tx/async_memcpy.c b/crypto/async_tx/async_memcpy.c index 7117ec6f1b74..89e05556f3df 100644 --- a/crypto/async_tx/async_memcpy.c +++ b/crypto/async_tx/async_memcpy.c @@ -33,28 +33,28 @@ * async_memcpy - attempt to copy memory with a dma engine. * @dest: destination page * @src: src page - * @offset: offset in pages to start transaction + * @dest_offset: offset into 'dest' to start transaction + * @src_offset: offset into 'src' to start transaction * @len: length in bytes - * @flags: ASYNC_TX_ACK - * @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 + * @submit: submission / completion modifiers + * + * honored flags: ASYNC_TX_ACK */ 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) + unsigned int src_offset, size_t len, + struct async_submit_ctl *submit) { - struct dma_chan *chan = async_tx_find_channel(depend_tx, DMA_MEMCPY, + struct dma_chan *chan = async_tx_find_channel(submit, DMA_MEMCPY, &dest, 1, &src, 1, len); struct dma_device *device = chan ? chan->device : NULL; struct dma_async_tx_descriptor *tx = NULL; if (device) { dma_addr_t dma_dest, dma_src; - unsigned long dma_prep_flags = cb_fn ? DMA_PREP_INTERRUPT : 0; + unsigned long dma_prep_flags; + dma_prep_flags = submit->cb_fn ? DMA_PREP_INTERRUPT : 0; dma_dest = dma_map_page(device->dev, dest, dest_offset, len, DMA_FROM_DEVICE); @@ -67,13 +67,13 @@ async_memcpy(struct page *dest, struct page *src, unsigned int dest_offset, if (tx) { pr_debug("%s: (async) len: %zu\n", __func__, len); - async_tx_submit(chan, tx, flags, depend_tx, cb_fn, cb_param); + async_tx_submit(chan, tx, submit); } else { void *dest_buf, *src_buf; pr_debug("%s: (sync) len: %zu\n", __func__, len); /* wait for any prerequisite operations */ - async_tx_quiesce(&depend_tx); + async_tx_quiesce(&submit->depend_tx); dest_buf = kmap_atomic(dest, KM_USER0) + dest_offset; src_buf = kmap_atomic(src, KM_USER1) + src_offset; @@ -83,7 +83,7 @@ async_memcpy(struct page *dest, struct page *src, unsigned int dest_offset, kunmap_atomic(dest_buf, KM_USER0); kunmap_atomic(src_buf, KM_USER1); - async_tx_sync_epilog(cb_fn, cb_param); + async_tx_sync_epilog(submit); } return tx; diff --git a/crypto/async_tx/async_memset.c b/crypto/async_tx/async_memset.c index b2f133885b7f..c14437238f4c 100644 --- a/crypto/async_tx/async_memset.c +++ b/crypto/async_tx/async_memset.c @@ -35,26 +35,23 @@ * @val: fill value * @offset: offset in pages to start transaction * @len: length in bytes - * @flags: ASYNC_TX_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 + * + * honored flags: ASYNC_TX_ACK */ 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) +async_memset(struct page *dest, int val, unsigned int offset, size_t len, + struct async_submit_ctl *submit) { - struct dma_chan *chan = async_tx_find_channel(depend_tx, DMA_MEMSET, + struct dma_chan *chan = async_tx_find_channel(submit, DMA_MEMSET, &dest, 1, NULL, 0, len); struct dma_device *device = chan ? chan->device : NULL; struct dma_async_tx_descriptor *tx = NULL; if (device) { dma_addr_t dma_dest; - unsigned long dma_prep_flags = cb_fn ? DMA_PREP_INTERRUPT : 0; + unsigned long dma_prep_flags; + dma_prep_flags = submit->cb_fn ? DMA_PREP_INTERRUPT : 0; dma_dest = dma_map_page(device->dev, dest, offset, len, DMA_FROM_DEVICE); @@ -64,19 +61,19 @@ async_memset(struct page *dest, int val, unsigned int offset, if (tx) { pr_debug("%s: (async) len: %zu\n", __func__, len); - async_tx_submit(chan, tx, flags, depend_tx, cb_fn, cb_param); + async_tx_submit(chan, tx, submit); } else { /* run the memset synchronously */ void *dest_buf; pr_debug("%s: (sync) len: %zu\n", __func__, len); - dest_buf = (void *) (((char *) page_address(dest)) + offset); + dest_buf = page_address(dest) + offset; /* wait for any prerequisite operations */ - async_tx_quiesce(&depend_tx); + async_tx_quiesce(&submit->depend_tx); memset(dest_buf, val, len); - async_tx_sync_epilog(cb_fn, cb_param); + async_tx_sync_epilog(submit); } return tx; diff --git a/crypto/async_tx/async_tx.c b/crypto/async_tx/async_tx.c index 3766bc3d7d89..802a5ce437d9 100644 --- a/crypto/async_tx/async_tx.c +++ b/crypto/async_tx/async_tx.c @@ -45,13 +45,15 @@ static void __exit async_tx_exit(void) /** * __async_tx_find_channel - find a channel to carry out the operation or let * the transaction execute synchronously - * @depend_tx: transaction dependency + * @submit: transaction dependency and submission modifiers * @tx_type: transaction type */ struct dma_chan * -__async_tx_find_channel(struct dma_async_tx_descriptor *depend_tx, - enum dma_transaction_type tx_type) +__async_tx_find_channel(struct async_submit_ctl *submit, + enum dma_transaction_type tx_type) { + struct dma_async_tx_descriptor *depend_tx = submit->depend_tx; + /* see if we can keep the chain on one channel */ if (depend_tx && dma_has_cap(tx_type, depend_tx->chan->device->cap_mask)) @@ -144,13 +146,14 @@ async_tx_channel_switch(struct dma_async_tx_descriptor *depend_tx, /** - * submit_disposition - while holding depend_tx->lock we must avoid submitting - * new operations to prevent a circular locking dependency with - * drivers that already hold a channel lock when calling - * async_tx_run_dependencies. + * submit_disposition - flags for routing an incoming operation * @ASYNC_TX_SUBMITTED: we were able to append the new operation under the lock * @ASYNC_TX_CHANNEL_SWITCH: when the lock is dropped schedule a channel switch * @ASYNC_TX_DIRECT_SUBMIT: when the lock is dropped submit directly + * + * while holding depend_tx->lock we must avoid submitting new operations + * to prevent a circular locking dependency with drivers that already + * hold a channel lock when calling async_tx_run_dependencies. */ enum submit_disposition { ASYNC_TX_SUBMITTED, @@ -160,11 +163,12 @@ enum submit_disposition { 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) + struct async_submit_ctl *submit) { - tx->callback = cb_fn; - tx->callback_param = cb_param; + struct dma_async_tx_descriptor *depend_tx = submit->depend_tx; + + tx->callback = submit->cb_fn; + tx->callback_param = submit->cb_param; if (depend_tx) { enum submit_disposition s; @@ -220,7 +224,7 @@ async_tx_submit(struct dma_chan *chan, struct dma_async_tx_descriptor *tx, tx->tx_submit(tx); } - if (flags & ASYNC_TX_ACK) + if (submit->flags & ASYNC_TX_ACK) async_tx_ack(tx); if (depend_tx) @@ -229,21 +233,20 @@ async_tx_submit(struct dma_chan *chan, struct dma_async_tx_descriptor *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 - * @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 + * async_trigger_callback - schedules the callback function to be run + * @submit: submission and completion parameters + * + * honored flags: ASYNC_TX_ACK + * + * The callback is run after any dependent operations have completed. */ 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) +async_trigger_callback(struct async_submit_ctl *submit) { struct dma_chan *chan; struct dma_device *device; struct dma_async_tx_descriptor *tx; + struct dma_async_tx_descriptor *depend_tx = submit->depend_tx; if (depend_tx) { chan = depend_tx->chan; @@ -262,14 +265,14 @@ async_trigger_callback(enum async_tx_flags flags, if (tx) { pr_debug("%s: (async)\n", __func__); - async_tx_submit(chan, tx, flags, depend_tx, cb_fn, cb_param); + async_tx_submit(chan, tx, submit); } else { pr_debug("%s: (sync)\n", __func__); /* wait for any prerequisite operations */ - async_tx_quiesce(&depend_tx); + async_tx_quiesce(&submit->depend_tx); - async_tx_sync_epilog(cb_fn, cb_param); + async_tx_sync_epilog(submit); } return tx; diff --git a/crypto/async_tx/async_xor.c b/crypto/async_tx/async_xor.c index 3cc5dc763b54..691fa98a18c4 100644 --- a/crypto/async_tx/async_xor.c +++ b/crypto/async_tx/async_xor.c @@ -34,18 +34,16 @@ 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, - enum async_tx_flags flags, - struct dma_async_tx_descriptor *depend_tx, - dma_async_tx_callback cb_fn, void *cb_param) + 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; - dma_async_tx_callback _cb_fn; - void *_cb_param; - enum async_tx_flags async_flags; + dma_async_tx_callback cb_fn_orig = submit->cb_fn; + void *cb_param_orig = submit->cb_param; + enum async_tx_flags flags_orig = submit->flags; enum dma_ctrl_flags dma_flags; int xor_src_cnt; dma_addr_t dma_dest; @@ -63,7 +61,7 @@ do_async_xor(struct dma_chan *chan, struct page *dest, struct page **src_list, } while (src_cnt) { - async_flags = flags; + submit->flags = flags_orig; dma_flags = 0; xor_src_cnt = min(src_cnt, dma->max_xor); /* if we are submitting additional xors, leave the chain open, @@ -71,15 +69,15 @@ do_async_xor(struct dma_chan *chan, struct page *dest, struct page **src_list, * buffer mapped */ if (src_cnt > xor_src_cnt) { - async_flags &= ~ASYNC_TX_ACK; + submit->flags &= ~ASYNC_TX_ACK; dma_flags = DMA_COMPL_SKIP_DEST_UNMAP; - _cb_fn = NULL; - _cb_param = NULL; + submit->cb_fn = NULL; + submit->cb_param = NULL; } else { - _cb_fn = cb_fn; - _cb_param = cb_param; + submit->cb_fn = cb_fn_orig; + submit->cb_param = cb_param_orig; } - if (_cb_fn) + if (submit->cb_fn) dma_flags |= DMA_PREP_INTERRUPT; /* Since we have clobbered the src_list we are committed @@ -90,7 +88,7 @@ do_async_xor(struct dma_chan *chan, struct page *dest, struct page **src_list, xor_src_cnt, len, dma_flags); if (unlikely(!tx)) - async_tx_quiesce(&depend_tx); + async_tx_quiesce(&submit->depend_tx); /* spin wait for the preceeding transactions to complete */ while (unlikely(!tx)) { @@ -101,10 +99,8 @@ do_async_xor(struct dma_chan *chan, struct page *dest, struct page **src_list, dma_flags); } - async_tx_submit(chan, tx, async_flags, depend_tx, _cb_fn, - _cb_param); - - depend_tx = tx; + async_tx_submit(chan, tx, submit); + submit->depend_tx = tx; if (src_cnt > xor_src_cnt) { /* drop completed sources */ @@ -123,8 +119,7 @@ do_async_xor(struct dma_chan *chan, struct page *dest, struct page **src_list, static void do_sync_xor(struct page *dest, struct page **src_list, unsigned int offset, - int src_cnt, size_t len, enum async_tx_flags flags, - dma_async_tx_callback cb_fn, void *cb_param) + int src_cnt, size_t len, struct async_submit_ctl *submit) { int i; int xor_src_cnt; @@ -139,7 +134,7 @@ do_sync_xor(struct page *dest, struct page **src_list, unsigned int offset, /* set destination address */ dest_buf = page_address(dest) + offset; - if (flags & ASYNC_TX_XOR_ZERO_DST) + if (submit->flags & ASYNC_TX_XOR_ZERO_DST) memset(dest_buf, 0, len); while (src_cnt > 0) { @@ -152,33 +147,35 @@ do_sync_xor(struct page *dest, struct page **src_list, unsigned int offset, src_off += xor_src_cnt; } - async_tx_sync_epilog(cb_fn, cb_param); + async_tx_sync_epilog(submit); } /** * 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_list: array of source pages + * @offset: common src/dst offset 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_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 + * @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 eninges is that they only + * use the destination buffer as a source when it is explicity 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, enum async_tx_flags flags, - struct dma_async_tx_descriptor *depend_tx, - dma_async_tx_callback cb_fn, void *cb_param) + int src_cnt, size_t len, struct async_submit_ctl *submit) { - struct dma_chan *chan = async_tx_find_channel(depend_tx, DMA_XOR, + struct dma_chan *chan = async_tx_find_channel(submit, DMA_XOR, &dest, 1, src_list, src_cnt, len); BUG_ON(src_cnt <= 1); @@ -188,7 +185,7 @@ async_xor(struct page *dest, struct page **src_list, unsigned int offset, pr_debug("%s (async): len: %zu\n", __func__, len); return do_async_xor(chan, dest, src_list, offset, src_cnt, len, - flags, depend_tx, cb_fn, cb_param); + submit); } else { /* run the xor synchronously */ pr_debug("%s (sync): len: %zu\n", __func__, len); @@ -196,16 +193,15 @@ async_xor(struct page *dest, struct page **src_list, unsigned int offset, /* in the sync case the dest is an implied source * (assumes the dest is the first source) */ - if (flags & ASYNC_TX_XOR_DROP_DST) { + if (submit->flags & ASYNC_TX_XOR_DROP_DST) { src_cnt--; src_list++; } /* wait for any prerequisite operations */ - async_tx_quiesce(&depend_tx); + async_tx_quiesce(&submit->depend_tx); - do_sync_xor(dest, src_list, offset, src_cnt, len, - flags, cb_fn, cb_param); + do_sync_xor(dest, src_list, offset, src_cnt, len, submit); return NULL; } @@ -222,25 +218,25 @@ static int page_is_zero(struct page *p, unsigned int offset, size_t len) /** * 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. The dest page must be listed as a source - * at index zero. The contents of this array may be overwritten. + * @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 - * @flags: ASYNC_TX_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 + * @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, - u32 *result, enum async_tx_flags flags, - struct dma_async_tx_descriptor *depend_tx, - dma_async_tx_callback cb_fn, void *cb_param) +async_xor_val(struct page *dest, struct page **src_list, unsigned int offset, + int src_cnt, size_t len, u32 *result, + struct async_submit_ctl *submit) { - struct dma_chan *chan = async_tx_find_channel(depend_tx, DMA_XOR_VAL, + struct dma_chan *chan = async_tx_find_channel(submit, DMA_XOR_VAL, &dest, 1, src_list, src_cnt, len); struct dma_device *device = chan ? chan->device : NULL; @@ -250,11 +246,12 @@ async_xor_val(struct page *dest, struct page **src_list, if (device && src_cnt <= device->max_xor) { dma_addr_t *dma_src = (dma_addr_t *) src_list; - unsigned long dma_prep_flags = cb_fn ? DMA_PREP_INTERRUPT : 0; + unsigned long dma_prep_flags; int i; pr_debug("%s: (async) len: %zu\n", __func__, len); + dma_prep_flags = submit->cb_fn ? DMA_PREP_INTERRUPT : 0; for (i = 0; i < src_cnt; i++) dma_src[i] = dma_map_page(device->dev, src_list[i], offset, len, DMA_TO_DEVICE); @@ -263,7 +260,7 @@ async_xor_val(struct page *dest, struct page **src_list, len, result, dma_prep_flags); if (unlikely(!tx)) { - async_tx_quiesce(&depend_tx); + async_tx_quiesce(&submit->depend_tx); while (!tx) { dma_async_issue_pending(chan); @@ -273,23 +270,23 @@ async_xor_val(struct page *dest, struct page **src_list, } } - async_tx_submit(chan, tx, flags, depend_tx, cb_fn, cb_param); + async_tx_submit(chan, tx, submit); } else { - unsigned long xor_flags = flags; + enum async_tx_flags flags_orig = submit->flags; pr_debug("%s: (sync) len: %zu\n", __func__, len); - xor_flags |= ASYNC_TX_XOR_DROP_DST; - xor_flags &= ~ASYNC_TX_ACK; + submit->flags |= ASYNC_TX_XOR_DROP_DST; + submit->flags &= ~ASYNC_TX_ACK; - tx = async_xor(dest, src_list, offset, src_cnt, len, xor_flags, - depend_tx, NULL, NULL); + tx = async_xor(dest, src_list, offset, src_cnt, len, submit); async_tx_quiesce(&tx); *result = page_is_zero(dest, offset, len) ? 0 : 1; - async_tx_sync_epilog(cb_fn, cb_param); + async_tx_sync_epilog(submit); + submit->flags = flags_orig; } return tx; diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c index 0ef5362c8d02..e1920f23579f 100644 --- a/drivers/md/raid5.c +++ b/drivers/md/raid5.c @@ -499,11 +499,14 @@ async_copy_data(int frombio, struct bio *bio, struct page *page, struct page *bio_page; int i; int page_offset; + struct async_submit_ctl submit; if (bio->bi_sector >= sector) page_offset = (signed)(bio->bi_sector - sector) * 512; else page_offset = (signed)(sector - bio->bi_sector) * -512; + + init_async_submit(&submit, 0, tx, NULL, NULL, NULL); bio_for_each_segment(bvl, bio, i) { int len = bio_iovec_idx(bio, i)->bv_len; int clen; @@ -525,13 +528,14 @@ async_copy_data(int frombio, struct bio *bio, struct page *page, bio_page = bio_iovec_idx(bio, i)->bv_page; if (frombio) tx = async_memcpy(page, bio_page, page_offset, - b_offset, clen, 0, - tx, NULL, NULL); + b_offset, clen, &submit); else tx = async_memcpy(bio_page, page, b_offset, - page_offset, clen, 0, - tx, NULL, NULL); + page_offset, clen, &submit); } + /* chain the operations */ + submit.depend_tx = tx; + if (clen < len) /* hit end of page */ break; page_offset += len; @@ -590,6 +594,7 @@ static void ops_run_biofill(struct stripe_head *sh) { struct dma_async_tx_descriptor *tx = NULL; raid5_conf_t *conf = sh->raid_conf; + struct async_submit_ctl submit; int i; pr_debug("%s: stripe %llu\n", __func__, @@ -613,7 +618,8 @@ static void ops_run_biofill(struct stripe_head *sh) } atomic_inc(&sh->count); - async_trigger_callback(ASYNC_TX_ACK, tx, ops_complete_biofill, sh); + init_async_submit(&submit, ASYNC_TX_ACK, tx, ops_complete_biofill, sh, NULL); + async_trigger_callback(&submit); } static void ops_complete_compute5(void *stripe_head_ref) @@ -645,6 +651,7 @@ static struct dma_async_tx_descriptor *ops_run_compute5(struct stripe_head *sh) struct page *xor_dest = tgt->page; int count = 0; struct dma_async_tx_descriptor *tx; + struct async_submit_ctl submit; int i; pr_debug("%s: stripe %llu block: %d\n", @@ -657,13 +664,12 @@ static struct dma_async_tx_descriptor *ops_run_compute5(struct stripe_head *sh) atomic_inc(&sh->count); + init_async_submit(&submit, ASYNC_TX_XOR_ZERO_DST, NULL, + ops_complete_compute5, sh, NULL); if (unlikely(count == 1)) - tx = async_memcpy(xor_dest, xor_srcs[0], 0, 0, STRIPE_SIZE, - 0, NULL, ops_complete_compute5, sh); + tx = async_memcpy(xor_dest, xor_srcs[0], 0, 0, STRIPE_SIZE, &submit); else - tx = async_xor(xor_dest, xor_srcs, 0, count, STRIPE_SIZE, - ASYNC_TX_XOR_ZERO_DST, NULL, - ops_complete_compute5, sh); + tx = async_xor(xor_dest, xor_srcs, 0, count, STRIPE_SIZE, &submit); return tx; } @@ -683,6 +689,7 @@ ops_run_prexor(struct stripe_head *sh, struct dma_async_tx_descriptor *tx) int disks = sh->disks; struct page *xor_srcs[disks]; int count = 0, pd_idx = sh->pd_idx, i; + struct async_submit_ctl submit; /* existing parity data subtracted */ struct page *xor_dest = xor_srcs[count++] = sh->dev[pd_idx].page; @@ -697,9 +704,9 @@ ops_run_prexor(struct stripe_head *sh, struct dma_async_tx_descriptor *tx) xor_srcs[count++] = dev->page; } - tx = async_xor(xor_dest, xor_srcs, 0, count, STRIPE_SIZE, - ASYNC_TX_XOR_DROP_DST, tx, - ops_complete_prexor, sh); + init_async_submit(&submit, ASYNC_TX_XOR_DROP_DST, tx, + ops_complete_prexor, sh, NULL); + tx = async_xor(xor_dest, xor_srcs, 0, count, STRIPE_SIZE, &submit); return tx; } @@ -772,7 +779,7 @@ ops_run_postxor(struct stripe_head *sh, struct dma_async_tx_descriptor *tx) /* kernel stack size limits the total number of disks */ int disks = sh->disks; struct page *xor_srcs[disks]; - + struct async_submit_ctl submit; int count = 0, pd_idx = sh->pd_idx, i; struct page *xor_dest; int prexor = 0; @@ -811,13 +818,11 @@ ops_run_postxor(struct stripe_head *sh, struct dma_async_tx_descriptor *tx) atomic_inc(&sh->count); - if (unlikely(count == 1)) { - flags &= ~(ASYNC_TX_XOR_DROP_DST | ASYNC_TX_XOR_ZERO_DST); - tx = async_memcpy(xor_dest, xor_srcs[0], 0, 0, STRIPE_SIZE, - flags, tx, ops_complete_postxor, sh); - } else - tx = async_xor(xor_dest, xor_srcs, 0, count, STRIPE_SIZE, - flags, tx, ops_complete_postxor, sh); + init_async_submit(&submit, flags, tx, ops_complete_postxor, sh, NULL); + if (unlikely(count == 1)) + tx = async_memcpy(xor_dest, xor_srcs[0], 0, 0, STRIPE_SIZE, &submit); + else + tx = async_xor(xor_dest, xor_srcs, 0, count, STRIPE_SIZE, &submit); } static void ops_complete_check(void *stripe_head_ref) @@ -838,6 +843,7 @@ static void ops_run_check(struct stripe_head *sh) int disks = sh->disks; struct page *xor_srcs[disks]; struct dma_async_tx_descriptor *tx; + struct async_submit_ctl submit; int count = 0, pd_idx = sh->pd_idx, i; struct page *xor_dest = xor_srcs[count++] = sh->dev[pd_idx].page; @@ -851,12 +857,13 @@ static void ops_run_check(struct stripe_head *sh) xor_srcs[count++] = dev->page; } + init_async_submit(&submit, 0, NULL, NULL, NULL, NULL); tx = async_xor_val(xor_dest, xor_srcs, 0, count, STRIPE_SIZE, - &sh->ops.zero_sum_result, 0, NULL, NULL, NULL); + &sh->ops.zero_sum_result, &submit); atomic_inc(&sh->count); - tx = async_trigger_callback(ASYNC_TX_ACK, tx, - ops_complete_check, sh); + init_async_submit(&submit, ASYNC_TX_ACK, tx, ops_complete_check, sh, NULL); + tx = async_trigger_callback(&submit); } static void raid5_run_ops(struct stripe_head *sh, unsigned long ops_request) @@ -2664,6 +2671,7 @@ static void handle_stripe_expansion(raid5_conf_t *conf, struct stripe_head *sh, if (i != sh->pd_idx && i != sh->qd_idx) { int dd_idx, j; struct stripe_head *sh2; + struct async_submit_ctl submit; sector_t bn = compute_blocknr(sh, i, 1); sector_t s = raid5_compute_sector(conf, bn, 0, @@ -2683,9 +2691,10 @@ static void handle_stripe_expansion(raid5_conf_t *conf, struct stripe_head *sh, } /* place all the copies on one channel */ + init_async_submit(&submit, 0, tx, NULL, NULL, NULL); tx = async_memcpy(sh2->dev[dd_idx].page, sh->dev[i].page, 0, 0, STRIPE_SIZE, - 0, tx, NULL, NULL); + &submit); set_bit(R5_Expanded, &sh2->dev[dd_idx].flags); set_bit(R5_UPTODATE, &sh2->dev[dd_idx].flags); diff --git a/include/linux/async_tx.h b/include/linux/async_tx.h index 9f14cd540cd2..00cfb637ddf2 100644 --- a/include/linux/async_tx.h +++ b/include/linux/async_tx.h @@ -65,6 +65,22 @@ enum async_tx_flags { ASYNC_TX_ACK = (1 << 2), }; +/** + * struct async_submit_ctl - async_tx submission/completion modifiers + * @flags: submission modifiers + * @depend_tx: parent dependency of the current operation being submitted + * @cb_fn: callback routine to run at operation completion + * @cb_param: parameter for the callback routine + * @scribble: caller provided space for dma/page address conversions + */ +struct async_submit_ctl { + enum async_tx_flags flags; + struct dma_async_tx_descriptor *depend_tx; + dma_async_tx_callback cb_fn; + void *cb_param; + void *scribble; +}; + #ifdef CONFIG_DMA_ENGINE #define async_tx_issue_pending_all dma_issue_pending_all #ifdef CONFIG_ARCH_HAS_ASYNC_TX_FIND_CHANNEL @@ -73,8 +89,8 @@ enum async_tx_flags { #define async_tx_find_channel(dep, type, dst, dst_count, src, src_count, len) \ __async_tx_find_channel(dep, type) struct dma_chan * -__async_tx_find_channel(struct dma_async_tx_descriptor *depend_tx, - enum dma_transaction_type tx_type); +__async_tx_find_channel(struct async_submit_ctl *submit, + enum dma_transaction_type tx_type); #endif /* CONFIG_ARCH_HAS_ASYNC_TX_FIND_CHANNEL */ #else static inline void async_tx_issue_pending_all(void) @@ -83,9 +99,10 @@ static inline void async_tx_issue_pending_all(void) } static inline struct dma_chan * -async_tx_find_channel(struct dma_async_tx_descriptor *depend_tx, - enum dma_transaction_type tx_type, struct page **dst, int dst_count, - struct page **src, int src_count, size_t len) +async_tx_find_channel(struct async_submit_ctl *submit, + enum dma_transaction_type tx_type, struct page **dst, + int dst_count, struct page **src, int src_count, + size_t len) { return NULL; } @@ -97,46 +114,53 @@ async_tx_find_channel(struct dma_async_tx_descriptor *depend_tx, * @cb_fn_param: parameter to pass to the callback routine */ static inline void -async_tx_sync_epilog(dma_async_tx_callback cb_fn, void *cb_fn_param) +async_tx_sync_epilog(struct async_submit_ctl *submit) +{ + if (submit->cb_fn) + submit->cb_fn(submit->cb_param); +} + +typedef union { + unsigned long addr; + struct page *page; + dma_addr_t dma; +} addr_conv_t; + +static inline void +init_async_submit(struct async_submit_ctl *args, enum async_tx_flags flags, + struct dma_async_tx_descriptor *tx, + dma_async_tx_callback cb_fn, void *cb_param, + addr_conv_t *scribble) { - if (cb_fn) - cb_fn(cb_fn_param); + args->flags = flags; + args->depend_tx = tx; + args->cb_fn = cb_fn; + args->cb_param = cb_param; + args->scribble = scribble; } -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_fn_param); +void async_tx_submit(struct dma_chan *chan, struct dma_async_tx_descriptor *tx, + struct async_submit_ctl *submit); 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_fn_param); + int src_cnt, size_t len, struct async_submit_ctl *submit); struct dma_async_tx_descriptor * -async_xor_val(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_fn_param); +async_xor_val(struct page *dest, struct page **src_list, unsigned int offset, + int src_cnt, size_t len, u32 *result, + struct async_submit_ctl *submit); 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_fn_param); + unsigned int src_offset, size_t len, + struct async_submit_ctl *submit); 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_fn_param); + size_t len, struct async_submit_ctl *submit); -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_fn_param); +struct dma_async_tx_descriptor *async_trigger_callback(struct async_submit_ctl *submit); void async_tx_quiesce(struct dma_async_tx_descriptor **tx); #endif /* _ASYNC_TX_H_ */ -- cgit v1.2.3 From 04ce9ab385dc97eb55299d533cd3af79b8fc7529 Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Wed, 3 Jun 2009 14:22:28 -0700 Subject: async_xor: permit callers to pass in a 'dma/page scribble' region async_xor() needs space to perform dma and page address conversions. In most cases the code can simply reuse the struct page * array because the size of the native pointer matches the size of a dma/page address. In order to support archs where sizeof(dma_addr_t) is larger than sizeof(struct page *), or to preserve the input parameters, we utilize a memory region passed in by the caller. Since the code is now prepared to handle the case where it cannot perform address conversions on the stack, we no longer need the !HIGHMEM64G dependency in drivers/dma/Kconfig. [ Impact: don't clobber input buffers for address conversions ] Reviewed-by: Andre Noll Acked-by: Maciej Sosnowski Signed-off-by: Dan Williams --- Documentation/crypto/async-tx-api.txt | 43 ++++++++++++++++--------- crypto/async_tx/async_xor.c | 60 +++++++++++++++++------------------ drivers/dma/Kconfig | 2 +- 3 files changed, 58 insertions(+), 47 deletions(-) (limited to 'crypto') diff --git a/Documentation/crypto/async-tx-api.txt b/Documentation/crypto/async-tx-api.txt index dfe0475f7919..6b15e488c0e7 100644 --- a/Documentation/crypto/async-tx-api.txt +++ b/Documentation/crypto/async-tx-api.txt @@ -115,29 +115,42 @@ of an operation. Perform a xor->copy->xor operation where each operation depends on the result from the previous operation: -void complete_xor_copy_xor(void *param) +void callback(void *param) { - printk("complete\n"); + struct completion *cmp = param; + + complete(cmp); } -int run_xor_copy_xor(struct page **xor_srcs, - int xor_src_cnt, - struct page *xor_dest, - size_t xor_len, - struct page *copy_src, - struct page *copy_dest, - size_t copy_len) +void run_xor_copy_xor(struct page **xor_srcs, + int xor_src_cnt, + struct page *xor_dest, + size_t xor_len, + struct page *copy_src, + struct page *copy_dest, + size_t copy_len) { struct dma_async_tx_descriptor *tx; + addr_conv_t addr_conv[xor_src_cnt]; + struct async_submit_ctl submit; + addr_conv_t addr_conv[NDISKS]; + struct completion cmp; + + init_async_submit(&submit, ASYNC_TX_XOR_DROP_DST, NULL, NULL, NULL, + addr_conv); + tx = async_xor(xor_dest, xor_srcs, 0, xor_src_cnt, xor_len, &submit) - tx = async_xor(xor_dest, xor_srcs, 0, xor_src_cnt, xor_len, - ASYNC_TX_XOR_DROP_DST, NULL, NULL, NULL); - tx = async_memcpy(copy_dest, copy_src, 0, 0, copy_len, tx, NULL, NULL); - tx = async_xor(xor_dest, xor_srcs, 0, xor_src_cnt, xor_len, - ASYNC_TX_XOR_DROP_DST | ASYNC_TX_ACK, - tx, complete_xor_copy_xor, NULL); + submit->depend_tx = tx; + tx = async_memcpy(copy_dest, copy_src, 0, 0, copy_len, &submit); + + init_completion(&cmp); + init_async_submit(&submit, ASYNC_TX_XOR_DROP_DST | ASYNC_TX_ACK, tx, + callback, &cmp, addr_conv); + tx = async_xor(xor_dest, xor_srcs, 0, xor_src_cnt, xor_len, &submit); async_tx_issue_pending_all(); + + wait_for_completion(&cmp); } See include/linux/async_tx.h for more information on the flags. See the diff --git a/crypto/async_tx/async_xor.c b/crypto/async_tx/async_xor.c index 691fa98a18c4..1e96c4df7061 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"); diff --git a/drivers/dma/Kconfig b/drivers/dma/Kconfig index 3b3c01b6f1ee..912a51b5cbd3 100644 --- a/drivers/dma/Kconfig +++ b/drivers/dma/Kconfig @@ -4,7 +4,7 @@ menuconfig DMADEVICES bool "DMA Engine support" - depends on !HIGHMEM64G && HAS_DMA + depends on HAS_DMA help DMA engines can do asynchronous data transfers without involving the host CPU. Currently, this framework can be -- cgit v1.2.3 From ad283ea4a3ce82cda2efe33163748a397b31b1eb Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Sat, 29 Aug 2009 19:09:26 -0700 Subject: async_tx: add sum check flags Replace the flat zero_sum_result with a collection of flags to contain the P (xor) zero-sum result, and the soon to be utilized Q (raid6 reed solomon syndrome) zero-sum result. Use the SUM_CHECK_ namespace instead of DMA_ since these flags will be used on non-dma-zero-sum enabled platforms. Reviewed-by: Andre Noll Acked-by: Maciej Sosnowski Signed-off-by: Dan Williams --- arch/arm/include/asm/hardware/iop3xx-adma.h | 5 +++-- arch/arm/mach-iop13xx/include/mach/adma.h | 12 +++++++----- crypto/async_tx/async_xor.c | 4 ++-- drivers/md/raid5.c | 2 +- drivers/md/raid5.h | 5 +++-- include/linux/async_tx.h | 2 +- include/linux/dmaengine.h | 21 ++++++++++++++++++++- 7 files changed, 37 insertions(+), 14 deletions(-) (limited to 'crypto') diff --git a/arch/arm/include/asm/hardware/iop3xx-adma.h b/arch/arm/include/asm/hardware/iop3xx-adma.h index 83e6ba338e2c..26eefea02314 100644 --- a/arch/arm/include/asm/hardware/iop3xx-adma.h +++ b/arch/arm/include/asm/hardware/iop3xx-adma.h @@ -756,13 +756,14 @@ static inline void iop_desc_set_block_fill_val(struct iop_adma_desc_slot *desc, hw_desc->src[0] = val; } -static inline int iop_desc_get_zero_result(struct iop_adma_desc_slot *desc) +static inline enum sum_check_flags +iop_desc_get_zero_result(struct iop_adma_desc_slot *desc) { struct iop3xx_desc_aau *hw_desc = desc->hw_desc; struct iop3xx_aau_desc_ctrl desc_ctrl = hw_desc->desc_ctrl_field; iop_paranoia(!(desc_ctrl.tx_complete && desc_ctrl.zero_result_en)); - return desc_ctrl.zero_result_err; + return desc_ctrl.zero_result_err << SUM_CHECK_P; } static inline void iop_chan_append(struct iop_adma_chan *chan) diff --git a/arch/arm/mach-iop13xx/include/mach/adma.h b/arch/arm/mach-iop13xx/include/mach/adma.h index 5722e86f2174..1cd31df8924d 100644 --- a/arch/arm/mach-iop13xx/include/mach/adma.h +++ b/arch/arm/mach-iop13xx/include/mach/adma.h @@ -428,18 +428,20 @@ static inline void iop_desc_set_block_fill_val(struct iop_adma_desc_slot *desc, hw_desc->block_fill_data = val; } -static inline int iop_desc_get_zero_result(struct iop_adma_desc_slot *desc) +static inline enum sum_check_flags +iop_desc_get_zero_result(struct iop_adma_desc_slot *desc) { struct iop13xx_adma_desc_hw *hw_desc = desc->hw_desc; struct iop13xx_adma_desc_ctrl desc_ctrl = hw_desc->desc_ctrl_field; struct iop13xx_adma_byte_count byte_count = hw_desc->byte_count_field; + enum sum_check_flags flags; BUG_ON(!(byte_count.tx_complete && desc_ctrl.zero_result)); - if (desc_ctrl.pq_xfer_en) - return byte_count.zero_result_err_q; - else - return byte_count.zero_result_err; + flags = byte_count.zero_result_err_q << SUM_CHECK_Q; + flags |= byte_count.zero_result_err << SUM_CHECK_P; + + return flags; } static inline void iop_chan_append(struct iop_adma_chan *chan) diff --git a/crypto/async_tx/async_xor.c b/crypto/async_tx/async_xor.c index 1e96c4df7061..78fb7780272a 100644 --- a/crypto/async_tx/async_xor.c +++ b/crypto/async_tx/async_xor.c @@ -246,7 +246,7 @@ static int page_is_zero(struct page *p, unsigned int offset, size_t len) */ struct dma_async_tx_descriptor * async_xor_val(struct page *dest, struct page **src_list, unsigned int offset, - int src_cnt, size_t len, u32 *result, + int src_cnt, size_t len, enum sum_check_flags *result, struct async_submit_ctl *submit) { struct dma_chan *chan = async_tx_find_channel(submit, DMA_XOR_VAL, @@ -304,7 +304,7 @@ async_xor_val(struct page *dest, struct page **src_list, unsigned int offset, async_tx_quiesce(&tx); - *result = page_is_zero(dest, offset, len) ? 0 : 1; + *result = !page_is_zero(dest, offset, len) << SUM_CHECK_P; async_tx_sync_epilog(submit); submit->flags = flags_orig; diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c index 7727954cf726..1f2a266f3cf7 100644 --- a/drivers/md/raid5.c +++ b/drivers/md/raid5.c @@ -2590,7 +2590,7 @@ static void handle_parity_checks5(raid5_conf_t *conf, struct stripe_head *sh, * we are done. Otherwise update the mismatch count and repair * parity if !MD_RECOVERY_CHECK */ - if (sh->ops.zero_sum_result == 0) + if ((sh->ops.zero_sum_result & SUM_CHECK_P_RESULT) == 0) /* parity is correct (on disc, * not in buffer any more) */ diff --git a/drivers/md/raid5.h b/drivers/md/raid5.h index e7baabffee86..75f2c6c4cf90 100644 --- a/drivers/md/raid5.h +++ b/drivers/md/raid5.h @@ -2,6 +2,7 @@ #define _RAID5_H #include +#include /* * @@ -215,8 +216,8 @@ struct stripe_head { * @target - STRIPE_OP_COMPUTE_BLK target */ struct stripe_operations { - int target; - u32 zero_sum_result; + int target; + enum sum_check_flags zero_sum_result; } ops; struct r5dev { struct bio req; diff --git a/include/linux/async_tx.h b/include/linux/async_tx.h index 00cfb637ddf2..3d21a2517518 100644 --- a/include/linux/async_tx.h +++ b/include/linux/async_tx.h @@ -148,7 +148,7 @@ async_xor(struct page *dest, struct page **src_list, unsigned int offset, struct dma_async_tx_descriptor * async_xor_val(struct page *dest, struct page **src_list, unsigned int offset, - int src_cnt, size_t len, u32 *result, + int src_cnt, size_t len, enum sum_check_flags *result, struct async_submit_ctl *submit); struct dma_async_tx_descriptor * diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h index 6768727d00d7..02447afcebad 100644 --- a/include/linux/dmaengine.h +++ b/include/linux/dmaengine.h @@ -86,6 +86,25 @@ enum dma_ctrl_flags { DMA_COMPL_SKIP_DEST_UNMAP = (1 << 3), }; +/** + * enum sum_check_bits - bit position of pq_check_flags + */ +enum sum_check_bits { + SUM_CHECK_P = 0, + SUM_CHECK_Q = 1, +}; + +/** + * enum pq_check_flags - result of async_{xor,pq}_zero_sum operations + * @SUM_CHECK_P_RESULT - 1 if xor zero sum error, 0 otherwise + * @SUM_CHECK_Q_RESULT - 1 if reed-solomon zero sum error, 0 otherwise + */ +enum sum_check_flags { + SUM_CHECK_P_RESULT = (1 << SUM_CHECK_P), + SUM_CHECK_Q_RESULT = (1 << SUM_CHECK_Q), +}; + + /** * dma_cap_mask_t - capabilities bitmap modeled after cpumask_t. * See linux/cpumask.h @@ -245,7 +264,7 @@ struct dma_device { unsigned int src_cnt, size_t len, unsigned long flags); struct dma_async_tx_descriptor *(*device_prep_dma_xor_val)( struct dma_chan *chan, dma_addr_t *src, unsigned int src_cnt, - size_t len, u32 *result, unsigned long flags); + size_t len, enum sum_check_flags *result, unsigned long flags); struct dma_async_tx_descriptor *(*device_prep_dma_memset)( struct dma_chan *chan, dma_addr_t dest, int value, size_t len, unsigned long flags); -- cgit v1.2.3 From af1f951eb6ef27b01cbfb3f6c21b770af4368a6d Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Sat, 29 Aug 2009 19:09:26 -0700 Subject: async_tx: kill needless module_{init|exit} If module_init and module_exit are nops then neither need to be defined. [ Impact: pure cleanup ] Reviewed-by: Andre Noll Acked-by: Maciej Sosnowski Signed-off-by: Dan Williams --- crypto/async_tx/async_memcpy.c | 13 ------------- crypto/async_tx/async_memset.c | 13 ------------- crypto/async_tx/async_tx.c | 17 +++-------------- 3 files changed, 3 insertions(+), 40 deletions(-) (limited to 'crypto') diff --git a/crypto/async_tx/async_memcpy.c b/crypto/async_tx/async_memcpy.c index 89e05556f3df..98e15bd0dcb5 100644 --- a/crypto/async_tx/async_memcpy.c +++ b/crypto/async_tx/async_memcpy.c @@ -90,19 +90,6 @@ async_memcpy(struct page *dest, struct page *src, unsigned int dest_offset, } 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 index c14437238f4c..b896a6e5f673 100644 --- a/crypto/async_tx/async_memset.c +++ b/crypto/async_tx/async_memset.c @@ -80,19 +80,6 @@ async_memset(struct page *dest, int val, unsigned int offset, size_t len, } 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 index 802a5ce437d9..6e37ad3f4417 100644 --- a/crypto/async_tx/async_tx.c +++ b/crypto/async_tx/async_tx.c @@ -42,6 +42,9 @@ static void __exit async_tx_exit(void) async_dmaengine_put(); } +module_init(async_tx_init); +module_exit(async_tx_exit); + /** * __async_tx_find_channel - find a channel to carry out the operation or let * the transaction execute synchronously @@ -61,17 +64,6 @@ __async_tx_find_channel(struct async_submit_ctl *submit, return async_dma_find_channel(tx_type); } 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 @@ -298,9 +290,6 @@ void async_tx_quiesce(struct dma_async_tx_descriptor **tx) } EXPORT_SYMBOL_GPL(async_tx_quiesce); -module_init(async_tx_init); -module_exit(async_tx_exit); - MODULE_AUTHOR("Intel Corporation"); MODULE_DESCRIPTION("Asynchronous Bulk Memory Transactions API"); MODULE_LICENSE("GPL"); -- cgit v1.2.3 From 95475e57113c66aac7583925736ed2e2d58c990d Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Tue, 14 Jul 2009 12:19:02 -0700 Subject: async_tx: remove walk of tx->parent chain in dma_wait_for_async_tx We currently walk the parent chain when waiting for a given tx to complete however this walk may race with the driver cleanup routine. The routines in async_raid6_recov.c may fall back to the synchronous path at any point so we need to be prepared to call async_tx_quiesce() (which calls dma_wait_for_async_tx). To remove the ->parent walk we guarantee that every time a dependency is attached ->issue_pending() is invoked, then we can simply poll the initial descriptor until completion. This also allows for a lighter weight 'issue pending' implementation as there is no longer a requirement to iterate through all the channels' ->issue_pending() routines as long as operations have been submitted in an ordered chain. async_tx_issue_pending() is added for this case. Signed-off-by: Dan Williams --- crypto/async_tx/async_tx.c | 13 +++++++------ drivers/dma/dmaengine.c | 45 ++++++++++----------------------------------- include/linux/async_tx.h | 23 +++++++++++++++++++++++ 3 files changed, 40 insertions(+), 41 deletions(-) (limited to 'crypto') diff --git a/crypto/async_tx/async_tx.c b/crypto/async_tx/async_tx.c index 6e37ad3f4417..60615fedcf5e 100644 --- a/crypto/async_tx/async_tx.c +++ b/crypto/async_tx/async_tx.c @@ -77,8 +77,8 @@ static void async_tx_channel_switch(struct dma_async_tx_descriptor *depend_tx, struct dma_async_tx_descriptor *tx) { - struct dma_chan *chan; - struct dma_device *device; + struct dma_chan *chan = depend_tx->chan; + struct dma_device *device = chan->device; struct dma_async_tx_descriptor *intr_tx = (void *) ~0; /* first check to see if we can still append to depend_tx */ @@ -90,11 +90,11 @@ async_tx_channel_switch(struct dma_async_tx_descriptor *depend_tx, } spin_unlock_bh(&depend_tx->lock); - if (!intr_tx) + /* attached dependency, flush the parent channel */ + if (!intr_tx) { + device->device_issue_pending(chan); return; - - chan = depend_tx->chan; - device = chan->device; + } /* see if we can schedule an interrupt * otherwise poll for completion @@ -128,6 +128,7 @@ async_tx_channel_switch(struct dma_async_tx_descriptor *depend_tx, intr_tx->tx_submit(intr_tx); async_tx_ack(intr_tx); } + device->device_issue_pending(chan); } else { if (dma_wait_for_async_tx(depend_tx) == DMA_ERROR) panic("%s: DMA_ERROR waiting for depend_tx\n", diff --git a/drivers/dma/dmaengine.c b/drivers/dma/dmaengine.c index 6781e8f3c064..e002e0e0d055 100644 --- a/drivers/dma/dmaengine.c +++ b/drivers/dma/dmaengine.c @@ -934,49 +934,24 @@ EXPORT_SYMBOL(dma_async_tx_descriptor_init); /* dma_wait_for_async_tx - spin wait for a transaction to complete * @tx: in-flight transaction to wait on - * - * This routine assumes that tx was obtained from a call to async_memcpy, - * async_xor, async_memset, etc which ensures that tx is "in-flight" (prepped - * and submitted). Walking the parent chain is only meant to cover for DMA - * drivers that do not implement the DMA_INTERRUPT capability and may race with - * the driver's descriptor cleanup routine. */ enum dma_status dma_wait_for_async_tx(struct dma_async_tx_descriptor *tx) { - enum dma_status status; - struct dma_async_tx_descriptor *iter; - struct dma_async_tx_descriptor *parent; + unsigned long dma_sync_wait_timeout = jiffies + msecs_to_jiffies(5000); if (!tx) return DMA_SUCCESS; - WARN_ONCE(tx->parent, "%s: speculatively walking dependency chain for" - " %s\n", __func__, dma_chan_name(tx->chan)); - - /* poll through the dependency chain, return when tx is complete */ - do { - iter = tx; - - /* find the root of the unsubmitted dependency chain */ - do { - parent = iter->parent; - if (!parent) - break; - else - iter = parent; - } while (parent); - - /* there is a small window for ->parent == NULL and - * ->cookie == -EBUSY - */ - while (iter->cookie == -EBUSY) - cpu_relax(); - - status = dma_sync_wait(iter->chan, iter->cookie); - } while (status == DMA_IN_PROGRESS || (iter != tx)); - - return status; + while (tx->cookie == -EBUSY) { + if (time_after_eq(jiffies, dma_sync_wait_timeout)) { + pr_err("%s timeout waiting for descriptor submission\n", + __func__); + return DMA_ERROR; + } + cpu_relax(); + } + return dma_sync_wait(tx->chan, tx->cookie); } EXPORT_SYMBOL_GPL(dma_wait_for_async_tx); diff --git a/include/linux/async_tx.h b/include/linux/async_tx.h index 3d21a2517518..12a2efcbd565 100644 --- a/include/linux/async_tx.h +++ b/include/linux/async_tx.h @@ -83,6 +83,24 @@ struct async_submit_ctl { #ifdef CONFIG_DMA_ENGINE #define async_tx_issue_pending_all dma_issue_pending_all + +/** + * async_tx_issue_pending - send pending descriptor to the hardware channel + * @tx: descriptor handle to retrieve hardware context + * + * Note: any dependent operations will have already been issued by + * async_tx_channel_switch, or (in the case of no channel switch) will + * be already pending on this channel. + */ +static inline void async_tx_issue_pending(struct dma_async_tx_descriptor *tx) +{ + if (likely(tx)) { + struct dma_chan *chan = tx->chan; + struct dma_device *dma = chan->device; + + dma->device_issue_pending(chan); + } +} #ifdef CONFIG_ARCH_HAS_ASYNC_TX_FIND_CHANNEL #include #else @@ -98,6 +116,11 @@ static inline void async_tx_issue_pending_all(void) do { } while (0); } +static inline void async_tx_issue_pending(struct dma_async_tx_descriptor *tx) +{ + do { } while (0); +} + static inline struct dma_chan * async_tx_find_channel(struct async_submit_ctl *submit, enum dma_transaction_type tx_type, struct page **dst, -- cgit v1.2.3 From b2f46fd8ef3dff2ab30f31126833f78b7480283a Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Tue, 14 Jul 2009 12:20:36 -0700 Subject: async_tx: add support for asynchronous GF multiplication [ Based on an original patch by Yuri Tikhonov ] This adds support for doing asynchronous GF multiplication by adding two additional functions to the async_tx API: async_gen_syndrome() does simultaneous XOR and Galois field multiplication of sources. async_syndrome_val() validates the given source buffers against known P and Q values. When a request is made to run async_pq against more than the hardware maximum number of supported sources we need to reuse the previous generated P and Q values as sources into the next operation. Care must be taken to remove Q from P' and P from Q'. For example to perform a 5 source pq op with hardware that only supports 4 sources at a time the following approach is taken: p, q = PQ(src0, src1, src2, src3, COEF({01}, {02}, {04}, {08})) p', q' = PQ(p, q, q, src4, COEF({00}, {01}, {00}, {10})) p' = p + q + q + src4 = p + src4 q' = {00}*p + {01}*q + {00}*q + {10}*src4 = q + {10}*src4 Note: 4 is the minimum acceptable maxpq otherwise we punt to synchronous-software path. The DMA_PREP_CONTINUE flag indicates to the driver to reuse p and q as sources (in the above manner) and fill the remaining slots up to maxpq with the new sources/coefficients. Note1: Some devices have native support for P+Q continuation and can skip this extra work. Devices with this capability can advertise it with dma_set_maxpq. It is up to each driver how to handle the DMA_PREP_CONTINUE flag. Note2: The api supports disabling the generation of P when generating Q, this is ignored by the synchronous path but is implemented by some dma devices to save unnecessary writes. In this case the continuation algorithm is simplified to only reuse Q as a source. Cc: H. Peter Anvin Cc: David Woodhouse Signed-off-by: Yuri Tikhonov Signed-off-by: Ilya Yanok Reviewed-by: Andre Noll Acked-by: Maciej Sosnowski Signed-off-by: Dan Williams --- Documentation/crypto/async-tx-api.txt | 3 + arch/arm/mach-iop13xx/setup.c | 2 +- crypto/async_tx/Kconfig | 4 + crypto/async_tx/Makefile | 1 + crypto/async_tx/async_pq.c | 388 ++++++++++++++++++++++++++++++++++ crypto/async_tx/async_xor.c | 2 +- drivers/dma/dmaengine.c | 4 + drivers/dma/iop-adma.c | 2 +- include/linux/async_tx.h | 9 + include/linux/dmaengine.h | 87 +++++++- 10 files changed, 493 insertions(+), 9 deletions(-) create mode 100644 crypto/async_tx/async_pq.c (limited to 'crypto') diff --git a/Documentation/crypto/async-tx-api.txt b/Documentation/crypto/async-tx-api.txt index 6b15e488c0e7..0e48e054d69a 100644 --- a/Documentation/crypto/async-tx-api.txt +++ b/Documentation/crypto/async-tx-api.txt @@ -64,6 +64,9 @@ xor - xor a series of source buffers and write the result to a xor_val - xor a series of source buffers and set a flag if the result is zero. The implementation attempts to prevent writes to memory +pq - generate the p+q (raid6 syndrome) from a series of source buffers +pq_val - validate that a p and or q buffer are in sync with a given series of + sources 3.3 Descriptor management: The return value is non-NULL and points to a 'descriptor' when the operation diff --git a/arch/arm/mach-iop13xx/setup.c b/arch/arm/mach-iop13xx/setup.c index 9800228b71d3..2e7ca0d75f8a 100644 --- a/arch/arm/mach-iop13xx/setup.c +++ b/arch/arm/mach-iop13xx/setup.c @@ -506,7 +506,7 @@ void __init iop13xx_platform_init(void) dma_cap_set(DMA_MEMSET, plat_data->cap_mask); dma_cap_set(DMA_MEMCPY_CRC32C, plat_data->cap_mask); dma_cap_set(DMA_INTERRUPT, plat_data->cap_mask); - dma_cap_set(DMA_PQ_XOR, plat_data->cap_mask); + dma_cap_set(DMA_PQ, plat_data->cap_mask); dma_cap_set(DMA_PQ_UPDATE, plat_data->cap_mask); dma_cap_set(DMA_PQ_VAL, plat_data->cap_mask); break; diff --git a/crypto/async_tx/Kconfig b/crypto/async_tx/Kconfig index d8fb39145986..cb6d7314f198 100644 --- a/crypto/async_tx/Kconfig +++ b/crypto/async_tx/Kconfig @@ -14,3 +14,7 @@ config ASYNC_MEMSET tristate select ASYNC_CORE +config ASYNC_PQ + tristate + select ASYNC_CORE + diff --git a/crypto/async_tx/Makefile b/crypto/async_tx/Makefile index 27baa7d52fbc..1b9926588259 100644 --- a/crypto/async_tx/Makefile +++ b/crypto/async_tx/Makefile @@ -2,3 +2,4 @@ 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 +obj-$(CONFIG_ASYNC_PQ) += async_pq.o diff --git a/crypto/async_tx/async_pq.c b/crypto/async_tx/async_pq.c new file mode 100644 index 000000000000..108b21efb499 --- /dev/null +++ b/crypto/async_tx/async_pq.c @@ -0,0 +1,388 @@ +/* + * Copyright(c) 2007 Yuri Tikhonov + * Copyright(c) 2009 Intel Corporation + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the Free + * Software Foundation; either version 2 of the License, or (at your option) + * any later version. + * + * This program is distributed in the hope that 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., 59 + * Temple Place - Suite 330, Boston, MA 02111-1307, USA. + * + * The full GNU General Public License is included in this distribution in the + * file called COPYING. + */ +#include +#include +#include +#include +#include + +/** + * scribble - space to hold throwaway P buffer for synchronous gen_syndrome + */ +static struct page *scribble; + +static bool is_raid6_zero_block(struct page *p) +{ + return p == (void *) raid6_empty_zero_page; +} + +/* the struct page *blocks[] parameter passed to async_gen_syndrome() + * and async_syndrome_val() contains the 'P' destination address at + * blocks[disks-2] and the 'Q' destination address at blocks[disks-1] + * + * note: these are macros as they are used as lvalues + */ +#define P(b, d) (b[d-2]) +#define Q(b, d) (b[d-1]) + +/** + * do_async_gen_syndrome - asynchronously calculate P and/or Q + */ +static __async_inline struct dma_async_tx_descriptor * +do_async_gen_syndrome(struct dma_chan *chan, struct page **blocks, + const unsigned char *scfs, unsigned int offset, int disks, + size_t len, dma_addr_t *dma_src, + struct async_submit_ctl *submit) +{ + struct dma_async_tx_descriptor *tx = NULL; + struct dma_device *dma = chan->device; + enum dma_ctrl_flags dma_flags = 0; + enum async_tx_flags flags_orig = submit->flags; + dma_async_tx_callback cb_fn_orig = submit->cb_fn; + dma_async_tx_callback cb_param_orig = submit->cb_param; + int src_cnt = disks - 2; + unsigned char coefs[src_cnt]; + unsigned short pq_src_cnt; + dma_addr_t dma_dest[2]; + int src_off = 0; + int idx; + int i; + + /* DMAs use destinations as sources, so use BIDIRECTIONAL mapping */ + if (P(blocks, disks)) + dma_dest[0] = dma_map_page(dma->dev, P(blocks, disks), offset, + len, DMA_BIDIRECTIONAL); + else + dma_flags |= DMA_PREP_PQ_DISABLE_P; + if (Q(blocks, disks)) + dma_dest[1] = dma_map_page(dma->dev, Q(blocks, disks), offset, + len, DMA_BIDIRECTIONAL); + else + dma_flags |= DMA_PREP_PQ_DISABLE_Q; + + /* convert source addresses being careful to collapse 'empty' + * sources and update the coefficients accordingly + */ + for (i = 0, idx = 0; i < src_cnt; i++) { + if (is_raid6_zero_block(blocks[i])) + continue; + dma_src[idx] = dma_map_page(dma->dev, blocks[i], offset, len, + DMA_TO_DEVICE); + coefs[idx] = scfs[i]; + idx++; + } + src_cnt = idx; + + while (src_cnt > 0) { + submit->flags = flags_orig; + pq_src_cnt = min(src_cnt, dma_maxpq(dma, dma_flags)); + /* if we are submitting additional pqs, leave the chain open, + * clear the callback parameters, and leave the destination + * buffers mapped + */ + if (src_cnt > pq_src_cnt) { + submit->flags &= ~ASYNC_TX_ACK; + dma_flags |= DMA_COMPL_SKIP_DEST_UNMAP; + submit->cb_fn = NULL; + submit->cb_param = NULL; + } else { + dma_flags &= ~DMA_COMPL_SKIP_DEST_UNMAP; + submit->cb_fn = cb_fn_orig; + submit->cb_param = cb_param_orig; + if (cb_fn_orig) + dma_flags |= DMA_PREP_INTERRUPT; + } + + /* Since we have clobbered the src_list we are committed + * to doing this asynchronously. Drivers force forward + * progress in case they can not provide a descriptor + */ + for (;;) { + tx = dma->device_prep_dma_pq(chan, dma_dest, + &dma_src[src_off], + pq_src_cnt, + &coefs[src_off], len, + dma_flags); + if (likely(tx)) + break; + async_tx_quiesce(&submit->depend_tx); + dma_async_issue_pending(chan); + } + + async_tx_submit(chan, tx, submit); + submit->depend_tx = tx; + + /* drop completed sources */ + src_cnt -= pq_src_cnt; + src_off += pq_src_cnt; + + dma_flags |= DMA_PREP_CONTINUE; + } + + return tx; +} + +/** + * do_sync_gen_syndrome - synchronously calculate a raid6 syndrome + */ +static void +do_sync_gen_syndrome(struct page **blocks, unsigned int offset, int disks, + size_t len, struct async_submit_ctl *submit) +{ + void **srcs; + int i; + + if (submit->scribble) + srcs = submit->scribble; + else + srcs = (void **) blocks; + + for (i = 0; i < disks; i++) { + if (is_raid6_zero_block(blocks[i])) { + BUG_ON(i > disks - 3); /* P or Q can't be zero */ + srcs[i] = blocks[i]; + } else + srcs[i] = page_address(blocks[i]) + offset; + } + raid6_call.gen_syndrome(disks, len, srcs); + async_tx_sync_epilog(submit); +} + +/** + * async_gen_syndrome - asynchronously calculate a raid6 syndrome + * @blocks: source blocks from idx 0..disks-3, P @ disks-2 and Q @ disks-1 + * @offset: common offset into each block (src and dest) to start transaction + * @disks: number of blocks (including missing P or Q, see below) + * @len: length of operation in bytes + * @submit: submission/completion modifiers + * + * General note: This routine assumes a field of GF(2^8) with a + * primitive polynomial of 0x11d and a generator of {02}. + * + * 'disks' note: callers can optionally omit either P or Q (but not + * both) from the calculation by setting blocks[disks-2] or + * blocks[disks-1] to NULL. When P or Q is omitted 'len' must be <= + * PAGE_SIZE as a temporary buffer of this size is used in the + * synchronous path. 'disks' always accounts for both destination + * buffers. + * + * 'blocks' note: if submit->scribble is NULL then the contents of + * 'blocks' may be overridden + */ +struct dma_async_tx_descriptor * +async_gen_syndrome(struct page **blocks, unsigned int offset, int disks, + size_t len, struct async_submit_ctl *submit) +{ + int src_cnt = disks - 2; + struct dma_chan *chan = async_tx_find_channel(submit, DMA_PQ, + &P(blocks, disks), 2, + blocks, src_cnt, len); + struct dma_device *device = chan ? chan->device : NULL; + dma_addr_t *dma_src = NULL; + + BUG_ON(disks > 255 || !(P(blocks, disks) || Q(blocks, disks))); + + if (submit->scribble) + dma_src = submit->scribble; + else if (sizeof(dma_addr_t) <= sizeof(struct page *)) + dma_src = (dma_addr_t *) blocks; + + if (dma_src && device && + (src_cnt <= dma_maxpq(device, 0) || + dma_maxpq(device, DMA_PREP_CONTINUE) > 0)) { + /* run the p+q asynchronously */ + pr_debug("%s: (async) disks: %d len: %zu\n", + __func__, disks, len); + return do_async_gen_syndrome(chan, blocks, raid6_gfexp, offset, + disks, len, dma_src, submit); + } + + /* run the pq synchronously */ + pr_debug("%s: (sync) disks: %d len: %zu\n", __func__, disks, len); + + /* wait for any prerequisite operations */ + async_tx_quiesce(&submit->depend_tx); + + if (!P(blocks, disks)) { + P(blocks, disks) = scribble; + BUG_ON(len + offset > PAGE_SIZE); + } + if (!Q(blocks, disks)) { + Q(blocks, disks) = scribble; + BUG_ON(len + offset > PAGE_SIZE); + } + do_sync_gen_syndrome(blocks, offset, disks, len, submit); + + return NULL; +} +EXPORT_SYMBOL_GPL(async_gen_syndrome); + +/** + * async_syndrome_val - asynchronously validate a raid6 syndrome + * @blocks: source blocks from idx 0..disks-3, P @ disks-2 and Q @ disks-1 + * @offset: common offset into each block (src and dest) to start transaction + * @disks: number of blocks (including missing P or Q, see below) + * @len: length of operation in bytes + * @pqres: on val failure SUM_CHECK_P_RESULT and/or SUM_CHECK_Q_RESULT are set + * @spare: temporary result buffer for the synchronous case + * @submit: submission / completion modifiers + * + * The same notes from async_gen_syndrome apply to the 'blocks', + * and 'disks' parameters of this routine. The synchronous path + * requires a temporary result buffer and submit->scribble to be + * specified. + */ +struct dma_async_tx_descriptor * +async_syndrome_val(struct page **blocks, unsigned int offset, int disks, + size_t len, enum sum_check_flags *pqres, struct page *spare, + struct async_submit_ctl *submit) +{ + struct dma_chan *chan = async_tx_find_channel(submit, DMA_PQ_VAL, + NULL, 0, blocks, disks, + len); + struct dma_device *device = chan ? chan->device : NULL; + struct dma_async_tx_descriptor *tx; + enum dma_ctrl_flags dma_flags = submit->cb_fn ? DMA_PREP_INTERRUPT : 0; + dma_addr_t *dma_src = NULL; + + BUG_ON(disks < 4); + + if (submit->scribble) + dma_src = submit->scribble; + else if (sizeof(dma_addr_t) <= sizeof(struct page *)) + dma_src = (dma_addr_t *) blocks; + + if (dma_src && device && disks <= dma_maxpq(device, 0)) { + struct device *dev = device->dev; + dma_addr_t *pq = &dma_src[disks-2]; + int i; + + pr_debug("%s: (async) disks: %d len: %zu\n", + __func__, disks, len); + if (!P(blocks, disks)) + dma_flags |= DMA_PREP_PQ_DISABLE_P; + if (!Q(blocks, disks)) + dma_flags |= DMA_PREP_PQ_DISABLE_Q; + for (i = 0; i < disks; i++) + if (likely(blocks[i])) { + BUG_ON(is_raid6_zero_block(blocks[i])); + dma_src[i] = dma_map_page(dev, blocks[i], + offset, len, + DMA_TO_DEVICE); + } + + for (;;) { + tx = device->device_prep_dma_pq_val(chan, pq, dma_src, + disks - 2, + raid6_gfexp, + len, pqres, + dma_flags); + if (likely(tx)) + break; + async_tx_quiesce(&submit->depend_tx); + dma_async_issue_pending(chan); + } + async_tx_submit(chan, tx, submit); + + return tx; + } else { + struct page *p_src = P(blocks, disks); + struct page *q_src = Q(blocks, disks); + enum async_tx_flags flags_orig = submit->flags; + dma_async_tx_callback cb_fn_orig = submit->cb_fn; + void *scribble = submit->scribble; + void *cb_param_orig = submit->cb_param; + void *p, *q, *s; + + pr_debug("%s: (sync) disks: %d len: %zu\n", + __func__, disks, len); + + /* caller must provide a temporary result buffer and + * allow the input parameters to be preserved + */ + BUG_ON(!spare || !scribble); + + /* wait for any prerequisite operations */ + async_tx_quiesce(&submit->depend_tx); + + /* recompute p and/or q into the temporary buffer and then + * check to see the result matches the current value + */ + tx = NULL; + *pqres = 0; + if (p_src) { + init_async_submit(submit, ASYNC_TX_XOR_ZERO_DST, NULL, + NULL, NULL, scribble); + tx = async_xor(spare, blocks, offset, disks-2, len, submit); + async_tx_quiesce(&tx); + p = page_address(p_src) + offset; + s = page_address(spare) + offset; + *pqres |= !!memcmp(p, s, len) << SUM_CHECK_P; + } + + if (q_src) { + P(blocks, disks) = NULL; + Q(blocks, disks) = spare; + init_async_submit(submit, 0, NULL, NULL, NULL, scribble); + tx = async_gen_syndrome(blocks, offset, disks, len, submit); + async_tx_quiesce(&tx); + q = page_address(q_src) + offset; + s = page_address(spare) + offset; + *pqres |= !!memcmp(q, s, len) << SUM_CHECK_Q; + } + + /* restore P, Q and submit */ + P(blocks, disks) = p_src; + Q(blocks, disks) = q_src; + + submit->cb_fn = cb_fn_orig; + submit->cb_param = cb_param_orig; + submit->flags = flags_orig; + async_tx_sync_epilog(submit); + + return NULL; + } +} +EXPORT_SYMBOL_GPL(async_syndrome_val); + +static int __init async_pq_init(void) +{ + scribble = alloc_page(GFP_KERNEL); + + if (scribble) + return 0; + + pr_err("%s: failed to allocate required spare page\n", __func__); + + return -ENOMEM; +} + +static void __exit async_pq_exit(void) +{ + put_page(scribble); +} + +module_init(async_pq_init); +module_exit(async_pq_exit); + +MODULE_DESCRIPTION("asynchronous raid6 syndrome generation/validation"); +MODULE_LICENSE("GPL"); diff --git a/crypto/async_tx/async_xor.c b/crypto/async_tx/async_xor.c index 78fb7780272a..56b5f98da463 100644 --- a/crypto/async_tx/async_xor.c +++ b/crypto/async_tx/async_xor.c @@ -62,7 +62,7 @@ do_async_xor(struct dma_chan *chan, struct page *dest, struct page **src_list, while (src_cnt) { submit->flags = flags_orig; dma_flags = 0; - xor_src_cnt = min(src_cnt, dma->max_xor); + xor_src_cnt = min(src_cnt, (int)dma->max_xor); /* if we are submitting additional xors, leave the chain open, * clear the callback parameters, and leave the destination * buffer mapped diff --git a/drivers/dma/dmaengine.c b/drivers/dma/dmaengine.c index e002e0e0d055..cd5673d3043b 100644 --- a/drivers/dma/dmaengine.c +++ b/drivers/dma/dmaengine.c @@ -646,6 +646,10 @@ int dma_async_device_register(struct dma_device *device) !device->device_prep_dma_xor); BUG_ON(dma_has_cap(DMA_XOR_VAL, device->cap_mask) && !device->device_prep_dma_xor_val); + BUG_ON(dma_has_cap(DMA_PQ, device->cap_mask) && + !device->device_prep_dma_pq); + BUG_ON(dma_has_cap(DMA_PQ_VAL, device->cap_mask) && + !device->device_prep_dma_pq_val); BUG_ON(dma_has_cap(DMA_MEMSET, device->cap_mask) && !device->device_prep_dma_memset); BUG_ON(dma_has_cap(DMA_INTERRUPT, device->cap_mask) && diff --git a/drivers/dma/iop-adma.c b/drivers/dma/iop-adma.c index 6ff79a672699..4496bc606662 100644 --- a/drivers/dma/iop-adma.c +++ b/drivers/dma/iop-adma.c @@ -1257,7 +1257,7 @@ static int __devinit iop_adma_probe(struct platform_device *pdev) dev_printk(KERN_INFO, &pdev->dev, "Intel(R) IOP: " "( %s%s%s%s%s%s%s%s%s%s)\n", - dma_has_cap(DMA_PQ_XOR, dma_dev->cap_mask) ? "pq_xor " : "", + dma_has_cap(DMA_PQ, dma_dev->cap_mask) ? "pq " : "", dma_has_cap(DMA_PQ_UPDATE, dma_dev->cap_mask) ? "pq_update " : "", dma_has_cap(DMA_PQ_VAL, dma_dev->cap_mask) ? "pq_val " : "", dma_has_cap(DMA_XOR, dma_dev->cap_mask) ? "xor " : "", diff --git a/include/linux/async_tx.h b/include/linux/async_tx.h index 12a2efcbd565..e6ce5f004f98 100644 --- a/include/linux/async_tx.h +++ b/include/linux/async_tx.h @@ -185,5 +185,14 @@ async_memset(struct page *dest, int val, unsigned int offset, struct dma_async_tx_descriptor *async_trigger_callback(struct async_submit_ctl *submit); +struct dma_async_tx_descriptor * +async_gen_syndrome(struct page **blocks, unsigned int offset, int src_cnt, + size_t len, struct async_submit_ctl *submit); + +struct dma_async_tx_descriptor * +async_syndrome_val(struct page **blocks, unsigned int offset, int src_cnt, + size_t len, enum sum_check_flags *pqres, struct page *spare, + struct async_submit_ctl *submit); + void async_tx_quiesce(struct dma_async_tx_descriptor **tx); #endif /* _ASYNC_TX_H_ */ diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h index 02447afcebad..ce010cd991d2 100644 --- a/include/linux/dmaengine.h +++ b/include/linux/dmaengine.h @@ -52,7 +52,7 @@ enum dma_status { enum dma_transaction_type { DMA_MEMCPY, DMA_XOR, - DMA_PQ_XOR, + DMA_PQ, DMA_DUAL_XOR, DMA_PQ_UPDATE, DMA_XOR_VAL, @@ -70,20 +70,28 @@ enum dma_transaction_type { /** * enum dma_ctrl_flags - DMA flags to augment operation preparation, - * control completion, and communicate status. + * control completion, and communicate status. * @DMA_PREP_INTERRUPT - trigger an interrupt (callback) upon completion of - * this transaction + * this transaction * @DMA_CTRL_ACK - the descriptor cannot be reused until the client - * acknowledges receipt, i.e. has has a chance to establish any - * dependency chains + * acknowledges receipt, i.e. has has a chance to establish any dependency + * chains * @DMA_COMPL_SKIP_SRC_UNMAP - set to disable dma-unmapping the source buffer(s) * @DMA_COMPL_SKIP_DEST_UNMAP - set to disable dma-unmapping the destination(s) + * @DMA_PREP_PQ_DISABLE_P - prevent generation of P while generating Q + * @DMA_PREP_PQ_DISABLE_Q - prevent generation of Q while generating P + * @DMA_PREP_CONTINUE - indicate to a driver that it is reusing buffers as + * sources that were the result of a previous operation, in the case of a PQ + * operation it continues the calculation with new sources */ enum dma_ctrl_flags { DMA_PREP_INTERRUPT = (1 << 0), DMA_CTRL_ACK = (1 << 1), DMA_COMPL_SKIP_SRC_UNMAP = (1 << 2), DMA_COMPL_SKIP_DEST_UNMAP = (1 << 3), + DMA_PREP_PQ_DISABLE_P = (1 << 4), + DMA_PREP_PQ_DISABLE_Q = (1 << 5), + DMA_PREP_CONTINUE = (1 << 6), }; /** @@ -226,6 +234,7 @@ struct dma_async_tx_descriptor { * @global_node: list_head for global dma_device_list * @cap_mask: one or more dma_capability flags * @max_xor: maximum number of xor sources, 0 if no capability + * @max_pq: maximum number of PQ sources and PQ-continue capability * @dev_id: unique device ID * @dev: struct device reference for dma mapping api * @device_alloc_chan_resources: allocate resources and return the @@ -234,6 +243,8 @@ struct dma_async_tx_descriptor { * @device_prep_dma_memcpy: prepares a memcpy operation * @device_prep_dma_xor: prepares a xor operation * @device_prep_dma_xor_val: prepares a xor validation operation + * @device_prep_dma_pq: prepares a pq operation + * @device_prep_dma_pq_val: prepares a pqzero_sum operation * @device_prep_dma_memset: prepares a memset operation * @device_prep_dma_interrupt: prepares an end of chain interrupt operation * @device_prep_slave_sg: prepares a slave dma operation @@ -248,7 +259,9 @@ struct dma_device { struct list_head channels; struct list_head global_node; dma_cap_mask_t cap_mask; - int max_xor; + unsigned short max_xor; + unsigned short max_pq; + #define DMA_HAS_PQ_CONTINUE (1 << 15) int dev_id; struct device *dev; @@ -265,6 +278,14 @@ struct dma_device { struct dma_async_tx_descriptor *(*device_prep_dma_xor_val)( struct dma_chan *chan, dma_addr_t *src, unsigned int src_cnt, size_t len, enum sum_check_flags *result, unsigned long flags); + struct dma_async_tx_descriptor *(*device_prep_dma_pq)( + struct dma_chan *chan, dma_addr_t *dst, dma_addr_t *src, + unsigned int src_cnt, const unsigned char *scf, + size_t len, unsigned long flags); + struct dma_async_tx_descriptor *(*device_prep_dma_pq_val)( + struct dma_chan *chan, dma_addr_t *pq, dma_addr_t *src, + unsigned int src_cnt, const unsigned char *scf, size_t len, + enum sum_check_flags *pqres, unsigned long flags); struct dma_async_tx_descriptor *(*device_prep_dma_memset)( struct dma_chan *chan, dma_addr_t dest, int value, size_t len, unsigned long flags); @@ -283,6 +304,60 @@ struct dma_device { void (*device_issue_pending)(struct dma_chan *chan); }; +static inline void +dma_set_maxpq(struct dma_device *dma, int maxpq, int has_pq_continue) +{ + dma->max_pq = maxpq; + if (has_pq_continue) + dma->max_pq |= DMA_HAS_PQ_CONTINUE; +} + +static inline bool dmaf_continue(enum dma_ctrl_flags flags) +{ + return (flags & DMA_PREP_CONTINUE) == DMA_PREP_CONTINUE; +} + +static inline bool dmaf_p_disabled_continue(enum dma_ctrl_flags flags) +{ + enum dma_ctrl_flags mask = DMA_PREP_CONTINUE | DMA_PREP_PQ_DISABLE_P; + + return (flags & mask) == mask; +} + +static inline bool dma_dev_has_pq_continue(struct dma_device *dma) +{ + return (dma->max_pq & DMA_HAS_PQ_CONTINUE) == DMA_HAS_PQ_CONTINUE; +} + +static unsigned short dma_dev_to_maxpq(struct dma_device *dma) +{ + return dma->max_pq & ~DMA_HAS_PQ_CONTINUE; +} + +/* dma_maxpq - reduce maxpq in the face of continued operations + * @dma - dma device with PQ capability + * @flags - to check if DMA_PREP_CONTINUE and DMA_PREP_PQ_DISABLE_P are set + * + * When an engine does not support native continuation we need 3 extra + * source slots to reuse P and Q with the following coefficients: + * 1/ {00} * P : remove P from Q', but use it as a source for P' + * 2/ {01} * Q : use Q to continue Q' calculation + * 3/ {00} * Q : subtract Q from P' to cancel (2) + * + * In the case where P is disabled we only need 1 extra source: + * 1/ {01} * Q : use Q to continue Q' calculation + */ +static inline int dma_maxpq(struct dma_device *dma, enum dma_ctrl_flags flags) +{ + if (dma_dev_has_pq_continue(dma) || !dmaf_continue(flags)) + return dma_dev_to_maxpq(dma); + else if (dmaf_p_disabled_continue(flags)) + return dma_dev_to_maxpq(dma) - 1; + else if (dmaf_continue(flags)) + return dma_dev_to_maxpq(dma) - 3; + BUG(); +} + /* --- public DMA engine API --- */ #ifdef CONFIG_DMA_ENGINE -- cgit v1.2.3 From 0a82a6239beecc95db6e05fe43ee62d16b381d38 Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Tue, 14 Jul 2009 12:20:37 -0700 Subject: async_tx: add support for asynchronous RAID6 recovery operations async_raid6_2data_recov() recovers two data disk failures async_raid6_datap_recov() recovers a data disk and the P disk These routines are a port of the synchronous versions found in drivers/md/raid6recov.c. The primary difference is breaking out the xor operations into separate calls to async_xor. Two helper routines are introduced to perform scalar multiplication where needed. async_sum_product() multiplies two sources by scalar coefficients and then sums (xor) the result. async_mult() simply multiplies a single source by a scalar. This implemention also includes, in contrast to the original synchronous-only code, special case handling for the 4-disk and 5-disk array cases. In these situations the default N-disk algorithm will present 0-source or 1-source operations to dma devices. To cover for dma devices where the minimum source count is 2 we implement 4-disk and 5-disk handling in the recovery code. [ Impact: asynchronous raid6 recovery routines for 2data and datap cases ] Cc: Yuri Tikhonov Cc: Ilya Yanok Cc: H. Peter Anvin Cc: David Woodhouse Reviewed-by: Andre Noll Acked-by: Maciej Sosnowski Signed-off-by: Dan Williams --- Documentation/crypto/async-tx-api.txt | 4 + crypto/async_tx/Kconfig | 5 + crypto/async_tx/Makefile | 1 + crypto/async_tx/async_raid6_recov.c | 448 ++++++++++++++++++++++++++++++++++ include/linux/async_tx.h | 8 + 5 files changed, 466 insertions(+) create mode 100644 crypto/async_tx/async_raid6_recov.c (limited to 'crypto') diff --git a/Documentation/crypto/async-tx-api.txt b/Documentation/crypto/async-tx-api.txt index 0e48e054d69a..ba046b8fa92f 100644 --- a/Documentation/crypto/async-tx-api.txt +++ b/Documentation/crypto/async-tx-api.txt @@ -67,6 +67,10 @@ xor_val - xor a series of source buffers and set a flag if the pq - generate the p+q (raid6 syndrome) from a series of source buffers pq_val - validate that a p and or q buffer are in sync with a given series of sources +datap - (raid6_datap_recov) recover a raid6 data block and the p block + from the given sources +2data - (raid6_2data_recov) recover 2 raid6 data blocks from the given + sources 3.3 Descriptor management: The return value is non-NULL and points to a 'descriptor' when the operation diff --git a/crypto/async_tx/Kconfig b/crypto/async_tx/Kconfig index cb6d7314f198..e5aeb2b79e6f 100644 --- a/crypto/async_tx/Kconfig +++ b/crypto/async_tx/Kconfig @@ -18,3 +18,8 @@ config ASYNC_PQ tristate select ASYNC_CORE +config ASYNC_RAID6_RECOV + tristate + select ASYNC_CORE + select ASYNC_PQ + diff --git a/crypto/async_tx/Makefile b/crypto/async_tx/Makefile index 1b9926588259..9a1a76811b80 100644 --- a/crypto/async_tx/Makefile +++ b/crypto/async_tx/Makefile @@ -3,3 +3,4 @@ obj-$(CONFIG_ASYNC_MEMCPY) += async_memcpy.o obj-$(CONFIG_ASYNC_MEMSET) += async_memset.o obj-$(CONFIG_ASYNC_XOR) += async_xor.o obj-$(CONFIG_ASYNC_PQ) += async_pq.o +obj-$(CONFIG_ASYNC_RAID6_RECOV) += async_raid6_recov.o diff --git a/crypto/async_tx/async_raid6_recov.c b/crypto/async_tx/async_raid6_recov.c new file mode 100644 index 000000000000..0c14d48c9896 --- /dev/null +++ b/crypto/async_tx/async_raid6_recov.c @@ -0,0 +1,448 @@ +/* + * Asynchronous RAID-6 recovery calculations ASYNC_TX API. + * Copyright(c) 2009 Intel Corporation + * + * based on raid6recov.c: + * Copyright 2002 H. Peter Anvin + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the Free + * Software Foundation; either version 2 of the License, or (at your option) + * any later version. + * + * This program is distributed in the hope that 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 +#include +#include +#include +#include + +static struct dma_async_tx_descriptor * +async_sum_product(struct page *dest, struct page **srcs, unsigned char *coef, + size_t len, struct async_submit_ctl *submit) +{ + struct dma_chan *chan = async_tx_find_channel(submit, DMA_PQ, + &dest, 1, srcs, 2, len); + struct dma_device *dma = chan ? chan->device : NULL; + const u8 *amul, *bmul; + u8 ax, bx; + u8 *a, *b, *c; + + if (dma) { + dma_addr_t dma_dest[2]; + dma_addr_t dma_src[2]; + struct device *dev = dma->dev; + struct dma_async_tx_descriptor *tx; + enum dma_ctrl_flags dma_flags = DMA_PREP_PQ_DISABLE_P; + + dma_dest[1] = dma_map_page(dev, dest, 0, len, DMA_BIDIRECTIONAL); + dma_src[0] = dma_map_page(dev, srcs[0], 0, len, DMA_TO_DEVICE); + dma_src[1] = dma_map_page(dev, srcs[1], 0, len, DMA_TO_DEVICE); + tx = dma->device_prep_dma_pq(chan, dma_dest, dma_src, 2, coef, + len, dma_flags); + if (tx) { + async_tx_submit(chan, tx, submit); + return tx; + } + } + + /* run the operation synchronously */ + async_tx_quiesce(&submit->depend_tx); + amul = raid6_gfmul[coef[0]]; + bmul = raid6_gfmul[coef[1]]; + a = page_address(srcs[0]); + b = page_address(srcs[1]); + c = page_address(dest); + + while (len--) { + ax = amul[*a++]; + bx = bmul[*b++]; + *c++ = ax ^ bx; + } + + return NULL; +} + +static struct dma_async_tx_descriptor * +async_mult(struct page *dest, struct page *src, u8 coef, size_t len, + struct async_submit_ctl *submit) +{ + struct dma_chan *chan = async_tx_find_channel(submit, DMA_PQ, + &dest, 1, &src, 1, len); + struct dma_device *dma = chan ? chan->device : NULL; + const u8 *qmul; /* Q multiplier table */ + u8 *d, *s; + + if (dma) { + dma_addr_t dma_dest[2]; + dma_addr_t dma_src[1]; + struct device *dev = dma->dev; + struct dma_async_tx_descriptor *tx; + enum dma_ctrl_flags dma_flags = DMA_PREP_PQ_DISABLE_P; + + dma_dest[1] = dma_map_page(dev, dest, 0, len, DMA_BIDIRECTIONAL); + dma_src[0] = dma_map_page(dev, src, 0, len, DMA_TO_DEVICE); + tx = dma->device_prep_dma_pq(chan, dma_dest, dma_src, 1, &coef, + len, dma_flags); + if (tx) { + async_tx_submit(chan, tx, submit); + return tx; + } + } + + /* no channel available, or failed to allocate a descriptor, so + * perform the operation synchronously + */ + async_tx_quiesce(&submit->depend_tx); + qmul = raid6_gfmul[coef]; + d = page_address(dest); + s = page_address(src); + + while (len--) + *d++ = qmul[*s++]; + + return NULL; +} + +static struct dma_async_tx_descriptor * +__2data_recov_4(size_t bytes, int faila, int failb, struct page **blocks, + struct async_submit_ctl *submit) +{ + struct dma_async_tx_descriptor *tx = NULL; + struct page *p, *q, *a, *b; + struct page *srcs[2]; + unsigned char coef[2]; + enum async_tx_flags flags = submit->flags; + dma_async_tx_callback cb_fn = submit->cb_fn; + void *cb_param = submit->cb_param; + void *scribble = submit->scribble; + + p = blocks[4-2]; + q = blocks[4-1]; + + a = blocks[faila]; + b = blocks[failb]; + + /* in the 4 disk case P + Pxy == P and Q + Qxy == Q */ + /* Dx = A*(P+Pxy) + B*(Q+Qxy) */ + srcs[0] = p; + srcs[1] = q; + coef[0] = raid6_gfexi[failb-faila]; + coef[1] = raid6_gfinv[raid6_gfexp[faila]^raid6_gfexp[failb]]; + init_async_submit(submit, 0, tx, NULL, NULL, scribble); + tx = async_sum_product(b, srcs, coef, bytes, submit); + + /* Dy = P+Pxy+Dx */ + srcs[0] = p; + srcs[1] = b; + init_async_submit(submit, flags | ASYNC_TX_XOR_ZERO_DST, tx, cb_fn, + cb_param, scribble); + tx = async_xor(a, srcs, 0, 2, bytes, submit); + + return tx; + +} + +static struct dma_async_tx_descriptor * +__2data_recov_5(size_t bytes, int faila, int failb, struct page **blocks, + struct async_submit_ctl *submit) +{ + struct dma_async_tx_descriptor *tx = NULL; + struct page *p, *q, *g, *dp, *dq; + struct page *srcs[2]; + unsigned char coef[2]; + enum async_tx_flags flags = submit->flags; + dma_async_tx_callback cb_fn = submit->cb_fn; + void *cb_param = submit->cb_param; + void *scribble = submit->scribble; + int uninitialized_var(good); + int i; + + for (i = 0; i < 3; i++) { + if (i == faila || i == failb) + continue; + else { + good = i; + break; + } + } + BUG_ON(i >= 3); + + p = blocks[5-2]; + q = blocks[5-1]; + g = blocks[good]; + + /* Compute syndrome with zero for the missing data pages + * Use the dead data pages as temporary storage for delta p and + * delta q + */ + dp = blocks[faila]; + dq = blocks[failb]; + + init_async_submit(submit, 0, tx, NULL, NULL, scribble); + tx = async_memcpy(dp, g, 0, 0, bytes, submit); + init_async_submit(submit, 0, tx, NULL, NULL, scribble); + tx = async_mult(dq, g, raid6_gfexp[good], bytes, submit); + + /* compute P + Pxy */ + srcs[0] = dp; + srcs[1] = p; + init_async_submit(submit, ASYNC_TX_XOR_DROP_DST, tx, NULL, NULL, + scribble); + tx = async_xor(dp, srcs, 0, 2, bytes, submit); + + /* compute Q + Qxy */ + srcs[0] = dq; + srcs[1] = q; + init_async_submit(submit, ASYNC_TX_XOR_DROP_DST, tx, NULL, NULL, + scribble); + tx = async_xor(dq, srcs, 0, 2, bytes, submit); + + /* Dx = A*(P+Pxy) + B*(Q+Qxy) */ + srcs[0] = dp; + srcs[1] = dq; + coef[0] = raid6_gfexi[failb-faila]; + coef[1] = raid6_gfinv[raid6_gfexp[faila]^raid6_gfexp[failb]]; + init_async_submit(submit, 0, tx, NULL, NULL, scribble); + tx = async_sum_product(dq, srcs, coef, bytes, submit); + + /* Dy = P+Pxy+Dx */ + srcs[0] = dp; + srcs[1] = dq; + init_async_submit(submit, flags | ASYNC_TX_XOR_DROP_DST, tx, cb_fn, + cb_param, scribble); + tx = async_xor(dp, srcs, 0, 2, bytes, submit); + + return tx; +} + +static struct dma_async_tx_descriptor * +__2data_recov_n(int disks, size_t bytes, int faila, int failb, + struct page **blocks, struct async_submit_ctl *submit) +{ + struct dma_async_tx_descriptor *tx = NULL; + struct page *p, *q, *dp, *dq; + struct page *srcs[2]; + unsigned char coef[2]; + enum async_tx_flags flags = submit->flags; + dma_async_tx_callback cb_fn = submit->cb_fn; + void *cb_param = submit->cb_param; + void *scribble = submit->scribble; + + p = blocks[disks-2]; + q = blocks[disks-1]; + + /* Compute syndrome with zero for the missing data pages + * Use the dead data pages as temporary storage for + * delta p and delta q + */ + dp = blocks[faila]; + blocks[faila] = (void *)raid6_empty_zero_page; + blocks[disks-2] = dp; + dq = blocks[failb]; + blocks[failb] = (void *)raid6_empty_zero_page; + blocks[disks-1] = dq; + + init_async_submit(submit, 0, tx, NULL, NULL, scribble); + tx = async_gen_syndrome(blocks, 0, disks, bytes, submit); + + /* Restore pointer table */ + blocks[faila] = dp; + blocks[failb] = dq; + blocks[disks-2] = p; + blocks[disks-1] = q; + + /* compute P + Pxy */ + srcs[0] = dp; + srcs[1] = p; + init_async_submit(submit, ASYNC_TX_XOR_DROP_DST, tx, NULL, NULL, + scribble); + tx = async_xor(dp, srcs, 0, 2, bytes, submit); + + /* compute Q + Qxy */ + srcs[0] = dq; + srcs[1] = q; + init_async_submit(submit, ASYNC_TX_XOR_DROP_DST, tx, NULL, NULL, + scribble); + tx = async_xor(dq, srcs, 0, 2, bytes, submit); + + /* Dx = A*(P+Pxy) + B*(Q+Qxy) */ + srcs[0] = dp; + srcs[1] = dq; + coef[0] = raid6_gfexi[failb-faila]; + coef[1] = raid6_gfinv[raid6_gfexp[faila]^raid6_gfexp[failb]]; + init_async_submit(submit, 0, tx, NULL, NULL, scribble); + tx = async_sum_product(dq, srcs, coef, bytes, submit); + + /* Dy = P+Pxy+Dx */ + srcs[0] = dp; + srcs[1] = dq; + init_async_submit(submit, flags | ASYNC_TX_XOR_DROP_DST, tx, cb_fn, + cb_param, scribble); + tx = async_xor(dp, srcs, 0, 2, bytes, submit); + + return tx; +} + +/** + * async_raid6_2data_recov - asynchronously calculate two missing data blocks + * @disks: number of disks in the RAID-6 array + * @bytes: block size + * @faila: first failed drive index + * @failb: second failed drive index + * @blocks: array of source pointers where the last two entries are p and q + * @submit: submission/completion modifiers + */ +struct dma_async_tx_descriptor * +async_raid6_2data_recov(int disks, size_t bytes, int faila, int failb, + struct page **blocks, struct async_submit_ctl *submit) +{ + BUG_ON(faila == failb); + if (failb < faila) + swap(faila, failb); + + pr_debug("%s: disks: %d len: %zu\n", __func__, disks, bytes); + + /* we need to preserve the contents of 'blocks' for the async + * case, so punt to synchronous if a scribble buffer is not available + */ + if (!submit->scribble) { + void **ptrs = (void **) blocks; + int i; + + async_tx_quiesce(&submit->depend_tx); + for (i = 0; i < disks; i++) + ptrs[i] = page_address(blocks[i]); + + raid6_2data_recov(disks, bytes, faila, failb, ptrs); + + async_tx_sync_epilog(submit); + + return NULL; + } + + switch (disks) { + case 4: + /* dma devices do not uniformly understand a zero source pq + * operation (in contrast to the synchronous case), so + * explicitly handle the 4 disk special case + */ + return __2data_recov_4(bytes, faila, failb, blocks, submit); + case 5: + /* dma devices do not uniformly understand a single + * source pq operation (in contrast to the synchronous + * case), so explicitly handle the 5 disk special case + */ + return __2data_recov_5(bytes, faila, failb, blocks, submit); + default: + return __2data_recov_n(disks, bytes, faila, failb, blocks, submit); + } +} +EXPORT_SYMBOL_GPL(async_raid6_2data_recov); + +/** + * async_raid6_datap_recov - asynchronously calculate a data and the 'p' block + * @disks: number of disks in the RAID-6 array + * @bytes: block size + * @faila: failed drive index + * @blocks: array of source pointers where the last two entries are p and q + * @submit: submission/completion modifiers + */ +struct dma_async_tx_descriptor * +async_raid6_datap_recov(int disks, size_t bytes, int faila, + struct page **blocks, struct async_submit_ctl *submit) +{ + struct dma_async_tx_descriptor *tx = NULL; + struct page *p, *q, *dq; + u8 coef; + enum async_tx_flags flags = submit->flags; + dma_async_tx_callback cb_fn = submit->cb_fn; + void *cb_param = submit->cb_param; + void *scribble = submit->scribble; + struct page *srcs[2]; + + pr_debug("%s: disks: %d len: %zu\n", __func__, disks, bytes); + + /* we need to preserve the contents of 'blocks' for the async + * case, so punt to synchronous if a scribble buffer is not available + */ + if (!scribble) { + void **ptrs = (void **) blocks; + int i; + + async_tx_quiesce(&submit->depend_tx); + for (i = 0; i < disks; i++) + ptrs[i] = page_address(blocks[i]); + + raid6_datap_recov(disks, bytes, faila, ptrs); + + async_tx_sync_epilog(submit); + + return NULL; + } + + p = blocks[disks-2]; + q = blocks[disks-1]; + + /* Compute syndrome with zero for the missing data page + * Use the dead data page as temporary storage for delta q + */ + dq = blocks[faila]; + blocks[faila] = (void *)raid6_empty_zero_page; + blocks[disks-1] = dq; + + /* in the 4 disk case we only need to perform a single source + * multiplication + */ + if (disks == 4) { + int good = faila == 0 ? 1 : 0; + struct page *g = blocks[good]; + + init_async_submit(submit, 0, tx, NULL, NULL, scribble); + tx = async_memcpy(p, g, 0, 0, bytes, submit); + + init_async_submit(submit, 0, tx, NULL, NULL, scribble); + tx = async_mult(dq, g, raid6_gfexp[good], bytes, submit); + } else { + init_async_submit(submit, 0, tx, NULL, NULL, scribble); + tx = async_gen_syndrome(blocks, 0, disks, bytes, submit); + } + + /* Restore pointer table */ + blocks[faila] = dq; + blocks[disks-1] = q; + + /* calculate g^{-faila} */ + coef = raid6_gfinv[raid6_gfexp[faila]]; + + srcs[0] = dq; + srcs[1] = q; + init_async_submit(submit, ASYNC_TX_XOR_DROP_DST, tx, NULL, NULL, + scribble); + tx = async_xor(dq, srcs, 0, 2, bytes, submit); + + init_async_submit(submit, 0, tx, NULL, NULL, scribble); + tx = async_mult(dq, dq, coef, bytes, submit); + + srcs[0] = p; + srcs[1] = dq; + init_async_submit(submit, flags | ASYNC_TX_XOR_DROP_DST, tx, cb_fn, + cb_param, scribble); + tx = async_xor(p, srcs, 0, 2, bytes, submit); + + return tx; +} +EXPORT_SYMBOL_GPL(async_raid6_datap_recov); + +MODULE_AUTHOR("Dan Williams "); +MODULE_DESCRIPTION("asynchronous RAID-6 recovery api"); +MODULE_LICENSE("GPL"); diff --git a/include/linux/async_tx.h b/include/linux/async_tx.h index e6ce5f004f98..866e61c4e2e0 100644 --- a/include/linux/async_tx.h +++ b/include/linux/async_tx.h @@ -194,5 +194,13 @@ async_syndrome_val(struct page **blocks, unsigned int offset, int src_cnt, size_t len, enum sum_check_flags *pqres, struct page *spare, struct async_submit_ctl *submit); +struct dma_async_tx_descriptor * +async_raid6_2data_recov(int src_num, size_t bytes, int faila, int failb, + struct page **ptrs, struct async_submit_ctl *submit); + +struct dma_async_tx_descriptor * +async_raid6_datap_recov(int src_num, size_t bytes, int faila, + struct page **ptrs, struct async_submit_ctl *submit); + void async_tx_quiesce(struct dma_async_tx_descriptor **tx); #endif /* _ASYNC_TX_H_ */ -- cgit v1.2.3 From cb3c82992f62f838e6476a0bff12909158007fc6 Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Tue, 14 Jul 2009 12:20:37 -0700 Subject: async_tx: raid6 recovery self test Port drivers/md/raid6test/test.c to use the async raid6 recovery routines. This is meant as a unit test for raid6 acceleration drivers. In addition to the 16-drive test case this implements tests for the 4-disk and 5-disk special cases (dma devices can not generically handle less than 2 sources), and adds a test for the D+Q case. Reviewed-by: Andre Noll Acked-by: Maciej Sosnowski Signed-off-by: Dan Williams --- crypto/async_tx/Makefile | 1 + crypto/async_tx/raid6test.c | 241 ++++++++++++++++++++++++++++++++++++++++++++ drivers/md/Kconfig | 13 +++ 3 files changed, 255 insertions(+) create mode 100644 crypto/async_tx/raid6test.c (limited to 'crypto') diff --git a/crypto/async_tx/Makefile b/crypto/async_tx/Makefile index 9a1a76811b80..d1e0e6f72bc1 100644 --- a/crypto/async_tx/Makefile +++ b/crypto/async_tx/Makefile @@ -4,3 +4,4 @@ obj-$(CONFIG_ASYNC_MEMSET) += async_memset.o obj-$(CONFIG_ASYNC_XOR) += async_xor.o obj-$(CONFIG_ASYNC_PQ) += async_pq.o obj-$(CONFIG_ASYNC_RAID6_RECOV) += async_raid6_recov.o +obj-$(CONFIG_ASYNC_RAID6_TEST) += raid6test.o diff --git a/crypto/async_tx/raid6test.c b/crypto/async_tx/raid6test.c new file mode 100644 index 000000000000..98c83ca96c83 --- /dev/null +++ b/crypto/async_tx/raid6test.c @@ -0,0 +1,241 @@ +/* + * asynchronous raid6 recovery self test + * Copyright (c) 2009, Intel Corporation. + * + * based on drivers/md/raid6test/test.c: + * Copyright 2002-2007 H. Peter Anvin + * + * 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 +#include + +#undef pr +#define pr(fmt, args...) pr_info("raid6test: " fmt, ##args) + +#define NDISKS 16 /* Including P and Q */ + +static struct page *dataptrs[NDISKS]; +static struct page *data[NDISKS+3]; +static struct page *spare; +static struct page *recovi; +static struct page *recovj; + +static void callback(void *param) +{ + struct completion *cmp = param; + + complete(cmp); +} + +static void makedata(int disks) +{ + int i, j; + + for (i = 0; i < disks; i++) { + for (j = 0; j < PAGE_SIZE/sizeof(u32); j += sizeof(u32)) { + u32 *p = page_address(data[i]) + j; + + *p = random32(); + } + + dataptrs[i] = data[i]; + } +} + +static char disk_type(int d, int disks) +{ + if (d == disks - 2) + return 'P'; + else if (d == disks - 1) + return 'Q'; + else + return 'D'; +} + +/* Recover two failed blocks. */ +static void raid6_dual_recov(int disks, size_t bytes, int faila, int failb, struct page **ptrs) +{ + struct async_submit_ctl submit; + addr_conv_t addr_conv[disks]; + struct completion cmp; + struct dma_async_tx_descriptor *tx = NULL; + enum sum_check_flags result = ~0; + + if (faila > failb) + swap(faila, failb); + + if (failb == disks-1) { + if (faila == disks-2) { + /* P+Q failure. Just rebuild the syndrome. */ + init_async_submit(&submit, 0, NULL, NULL, NULL, addr_conv); + tx = async_gen_syndrome(ptrs, 0, disks, bytes, &submit); + } else { + struct page *blocks[disks]; + struct page *dest; + int count = 0; + int i; + + /* data+Q failure. Reconstruct data from P, + * then rebuild syndrome + */ + for (i = disks; i-- ; ) { + if (i == faila || i == failb) + continue; + blocks[count++] = ptrs[i]; + } + dest = ptrs[faila]; + init_async_submit(&submit, ASYNC_TX_XOR_ZERO_DST, NULL, + NULL, NULL, addr_conv); + tx = async_xor(dest, blocks, 0, count, bytes, &submit); + + init_async_submit(&submit, 0, tx, NULL, NULL, addr_conv); + tx = async_gen_syndrome(ptrs, 0, disks, bytes, &submit); + } + } else { + if (failb == disks-2) { + /* data+P failure. */ + init_async_submit(&submit, 0, NULL, NULL, NULL, addr_conv); + tx = async_raid6_datap_recov(disks, bytes, faila, ptrs, &submit); + } else { + /* data+data failure. */ + init_async_submit(&submit, 0, NULL, NULL, NULL, addr_conv); + tx = async_raid6_2data_recov(disks, bytes, faila, failb, ptrs, &submit); + } + } + init_completion(&cmp); + init_async_submit(&submit, ASYNC_TX_ACK, tx, callback, &cmp, addr_conv); + tx = async_syndrome_val(ptrs, 0, disks, bytes, &result, spare, &submit); + async_tx_issue_pending(tx); + + if (wait_for_completion_timeout(&cmp, msecs_to_jiffies(3000)) == 0) + pr("%s: timeout! (faila: %d failb: %d disks: %d)\n", + __func__, faila, failb, disks); + + if (result != 0) + pr("%s: validation failure! faila: %d failb: %d sum_check_flags: %x\n", + __func__, faila, failb, result); +} + +static int test_disks(int i, int j, int disks) +{ + int erra, errb; + + memset(page_address(recovi), 0xf0, PAGE_SIZE); + memset(page_address(recovj), 0xba, PAGE_SIZE); + + dataptrs[i] = recovi; + dataptrs[j] = recovj; + + raid6_dual_recov(disks, PAGE_SIZE, i, j, dataptrs); + + erra = memcmp(page_address(data[i]), page_address(recovi), PAGE_SIZE); + errb = memcmp(page_address(data[j]), page_address(recovj), PAGE_SIZE); + + pr("%s(%d, %d): faila=%3d(%c) failb=%3d(%c) %s\n", + __func__, i, j, i, disk_type(i, disks), j, disk_type(j, disks), + (!erra && !errb) ? "OK" : !erra ? "ERRB" : !errb ? "ERRA" : "ERRAB"); + + dataptrs[i] = data[i]; + dataptrs[j] = data[j]; + + return erra || errb; +} + +static int test(int disks, int *tests) +{ + addr_conv_t addr_conv[disks]; + struct dma_async_tx_descriptor *tx; + struct async_submit_ctl submit; + struct completion cmp; + int err = 0; + int i, j; + + recovi = data[disks]; + recovj = data[disks+1]; + spare = data[disks+2]; + + makedata(disks); + + /* Nuke syndromes */ + memset(page_address(data[disks-2]), 0xee, PAGE_SIZE); + memset(page_address(data[disks-1]), 0xee, PAGE_SIZE); + + /* Generate assumed good syndrome */ + init_completion(&cmp); + init_async_submit(&submit, ASYNC_TX_ACK, NULL, callback, &cmp, addr_conv); + tx = async_gen_syndrome(dataptrs, 0, disks, PAGE_SIZE, &submit); + async_tx_issue_pending(tx); + + if (wait_for_completion_timeout(&cmp, msecs_to_jiffies(3000)) == 0) { + pr("error: initial gen_syndrome(%d) timed out\n", disks); + return 1; + } + + pr("testing the %d-disk case...\n", disks); + for (i = 0; i < disks-1; i++) + for (j = i+1; j < disks; j++) { + (*tests)++; + err += test_disks(i, j, disks); + } + + return err; +} + + +static int raid6_test(void) +{ + int err = 0; + int tests = 0; + int i; + + for (i = 0; i < NDISKS+3; i++) { + data[i] = alloc_page(GFP_KERNEL); + if (!data[i]) { + while (i--) + put_page(data[i]); + return -ENOMEM; + } + } + + /* the 4-disk and 5-disk cases are special for the recovery code */ + if (NDISKS > 4) + err += test(4, &tests); + if (NDISKS > 5) + err += test(5, &tests); + err += test(NDISKS, &tests); + + pr("\n"); + pr("complete (%d tests, %d failure%s)\n", + tests, err, err == 1 ? "" : "s"); + + for (i = 0; i < NDISKS+3; i++) + put_page(data[i]); + + return 0; +} + +static void raid6_test_exit(void) +{ +} + +/* when compiled-in wait for drivers to load first (assumes dma drivers + * are also compliled-in) + */ +late_initcall(raid6_test); +module_exit(raid6_test_exit); +MODULE_AUTHOR("Dan Williams "); +MODULE_DESCRIPTION("asynchronous RAID-6 recovery self tests"); +MODULE_LICENSE("GPL"); diff --git a/drivers/md/Kconfig b/drivers/md/Kconfig index 36e0675be9f7..41b3ae25b813 100644 --- a/drivers/md/Kconfig +++ b/drivers/md/Kconfig @@ -155,6 +155,19 @@ config MD_RAID456 config MD_RAID6_PQ tristate +config ASYNC_RAID6_TEST + tristate "Self test for hardware accelerated raid6 recovery" + depends on MD_RAID6_PQ + select ASYNC_RAID6_RECOV + ---help--- + This is a one-shot self test that permutes through the + recovery of all the possible two disk failure scenarios for a + N-disk array. Recovery is performed with the asynchronous + raid6 recovery routines, and will optionally use an offload + engine if one is available. + + If unsure, say N. + config MD_MULTIPATH tristate "Multipath I/O support" depends on BLK_DEV_MD -- cgit v1.2.3