mirror of
https://github.com/torvalds/linux.git
synced 2024-12-05 10:32:35 +00:00
4bb33cc890
Part of the include cleanups means that the implicit inclusion of module.h via device.h is going away. So fix things up in advance. Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
418 lines
12 KiB
C
418 lines
12 KiB
C
/*
|
|
* Copyright(c) 2007 Yuri Tikhonov <yur@emcraft.com>
|
|
* 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 <linux/kernel.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/module.h>
|
|
#include <linux/dma-mapping.h>
|
|
#include <linux/raid/pq.h>
|
|
#include <linux/async_tx.h>
|
|
#include <linux/gfp.h>
|
|
|
|
/**
|
|
* pq_scribble_page - space to hold throwaway P or Q buffer for
|
|
* synchronous gen_syndrome
|
|
*/
|
|
static struct page *pq_scribble_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 (blocks[i] == NULL)
|
|
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;
|
|
submit->flags |= ASYNC_TX_FENCE;
|
|
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;
|
|
}
|
|
if (submit->flags & ASYNC_TX_FENCE)
|
|
dma_flags |= DMA_PREP_FENCE;
|
|
|
|
/* 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 (blocks[i] == NULL) {
|
|
BUG_ON(i > disks - 3); /* P or Q can't be zero */
|
|
srcs[i] = (void*)raid6_empty_zero_page;
|
|
} 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. If any source buffers (blocks[i] where i < disks - 2) are
|
|
* set to NULL those buffers will be replaced with the raid6_zero_page
|
|
* in the synchronous path and omitted in the hardware-asynchronous
|
|
* path.
|
|
*
|
|
* 'blocks' note: if submit->scribble is NULL then the contents of
|
|
* 'blocks' may be overwritten to perform address conversions
|
|
* (dma_map_page() or page_address()).
|
|
*/
|
|
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) &&
|
|
is_dma_pq_aligned(device, offset, 0, len)) {
|
|
/* 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) = pq_scribble_page;
|
|
BUG_ON(len + offset > PAGE_SIZE);
|
|
}
|
|
if (!Q(blocks, disks)) {
|
|
Q(blocks, disks) = pq_scribble_page;
|
|
BUG_ON(len + offset > PAGE_SIZE);
|
|
}
|
|
do_sync_gen_syndrome(blocks, offset, disks, len, submit);
|
|
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL_GPL(async_gen_syndrome);
|
|
|
|
static inline struct dma_chan *
|
|
pq_val_chan(struct async_submit_ctl *submit, struct page **blocks, int disks, size_t len)
|
|
{
|
|
#ifdef CONFIG_ASYNC_TX_DISABLE_PQ_VAL_DMA
|
|
return NULL;
|
|
#endif
|
|
return async_tx_find_channel(submit, DMA_PQ_VAL, NULL, 0, blocks,
|
|
disks, len);
|
|
}
|
|
|
|
/**
|
|
* 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 = pq_val_chan(submit, blocks, disks, len);
|
|
struct dma_device *device = chan ? chan->device : NULL;
|
|
struct dma_async_tx_descriptor *tx;
|
|
unsigned char coefs[disks-2];
|
|
enum dma_ctrl_flags dma_flags = submit->cb_fn ? DMA_PREP_INTERRUPT : 0;
|
|
dma_addr_t *dma_src = NULL;
|
|
int src_cnt = 0;
|
|
|
|
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) &&
|
|
is_dma_pq_aligned(device, offset, 0, len)) {
|
|
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;
|
|
else
|
|
pq[0] = dma_map_page(dev, P(blocks, disks),
|
|
offset, len,
|
|
DMA_TO_DEVICE);
|
|
if (!Q(blocks, disks))
|
|
dma_flags |= DMA_PREP_PQ_DISABLE_Q;
|
|
else
|
|
pq[1] = dma_map_page(dev, Q(blocks, disks),
|
|
offset, len,
|
|
DMA_TO_DEVICE);
|
|
|
|
if (submit->flags & ASYNC_TX_FENCE)
|
|
dma_flags |= DMA_PREP_FENCE;
|
|
for (i = 0; i < disks-2; i++)
|
|
if (likely(blocks[i])) {
|
|
dma_src[src_cnt] = dma_map_page(dev, blocks[i],
|
|
offset, len,
|
|
DMA_TO_DEVICE);
|
|
coefs[src_cnt] = raid6_gfexp[i];
|
|
src_cnt++;
|
|
}
|
|
|
|
for (;;) {
|
|
tx = device->device_prep_dma_pq_val(chan, pq, dma_src,
|
|
src_cnt,
|
|
coefs,
|
|
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)
|
|
{
|
|
pq_scribble_page = alloc_page(GFP_KERNEL);
|
|
|
|
if (pq_scribble_page)
|
|
return 0;
|
|
|
|
pr_err("%s: failed to allocate required spare page\n", __func__);
|
|
|
|
return -ENOMEM;
|
|
}
|
|
|
|
static void __exit async_pq_exit(void)
|
|
{
|
|
put_page(pq_scribble_page);
|
|
}
|
|
|
|
module_init(async_pq_init);
|
|
module_exit(async_pq_exit);
|
|
|
|
MODULE_DESCRIPTION("asynchronous raid6 syndrome generation/validation");
|
|
MODULE_LICENSE("GPL");
|