#include <linux/dmaengine.h>
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)
+async_sum_product(struct page *dest, unsigned int d_off,
+ struct page **srcs, unsigned int *src_offs, 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);
if (submit->flags & ASYNC_TX_FENCE)
dma_flags |= DMA_PREP_FENCE;
- unmap->addr[0] = dma_map_page(dev, srcs[0], 0, len, DMA_TO_DEVICE);
- unmap->addr[1] = dma_map_page(dev, srcs[1], 0, len, DMA_TO_DEVICE);
+ unmap->addr[0] = dma_map_page(dev, srcs[0], src_offs[0],
+ len, DMA_TO_DEVICE);
+ unmap->addr[1] = dma_map_page(dev, srcs[1], src_offs[1],
+ len, DMA_TO_DEVICE);
unmap->to_cnt = 2;
- unmap->addr[2] = dma_map_page(dev, dest, 0, len, DMA_BIDIRECTIONAL);
+ unmap->addr[2] = dma_map_page(dev, dest, d_off,
+ len, DMA_BIDIRECTIONAL);
unmap->bidi_cnt = 1;
/* engine only looks at Q, but expects it to follow P */
pq[1] = unmap->addr[2];
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);
+ a = page_address(srcs[0]) + src_offs[0];
+ b = page_address(srcs[1]) + src_offs[1];
+ c = page_address(dest) + d_off;
while (len--) {
ax = amul[*a++];
}
static struct dma_async_tx_descriptor *
-async_mult(struct page *dest, struct page *src, u8 coef, size_t len,
- struct async_submit_ctl *submit)
+async_mult(struct page *dest, unsigned int d_off, struct page *src,
+ unsigned int s_off, 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);
if (submit->flags & ASYNC_TX_FENCE)
dma_flags |= DMA_PREP_FENCE;
- unmap->addr[0] = dma_map_page(dev, src, 0, len, DMA_TO_DEVICE);
+ unmap->addr[0] = dma_map_page(dev, src, s_off,
+ len, DMA_TO_DEVICE);
unmap->to_cnt++;
- unmap->addr[1] = dma_map_page(dev, dest, 0, len, DMA_BIDIRECTIONAL);
+ unmap->addr[1] = dma_map_page(dev, dest, d_off,
+ len, DMA_BIDIRECTIONAL);
dma_dest[1] = unmap->addr[1];
unmap->bidi_cnt++;
unmap->len = len;
*/
async_tx_quiesce(&submit->depend_tx);
qmul = raid6_gfmul[coef];
- d = page_address(dest);
- s = page_address(src);
+ d = page_address(dest) + d_off;
+ s = page_address(src) + s_off;
while (len--)
*d++ = qmul[*s++];
static struct dma_async_tx_descriptor *
__2data_recov_4(int disks, size_t bytes, int faila, int failb,
- struct page **blocks, struct async_submit_ctl *submit)
+ struct page **blocks, unsigned int *offs,
+ struct async_submit_ctl *submit)
{
struct dma_async_tx_descriptor *tx = NULL;
struct page *p, *q, *a, *b;
+ unsigned int p_off, q_off, a_off, b_off;
struct page *srcs[2];
+ unsigned int src_offs[2];
unsigned char coef[2];
enum async_tx_flags flags = submit->flags;
dma_async_tx_callback cb_fn = submit->cb_fn;
void *scribble = submit->scribble;
p = blocks[disks-2];
+ p_off = offs[disks-2];
q = blocks[disks-1];
+ q_off = offs[disks-1];
a = blocks[faila];
+ a_off = offs[faila];
b = blocks[failb];
+ b_off = offs[failb];
/* in the 4 disk case P + Pxy == P and Q + Qxy == Q */
/* Dx = A*(P+Pxy) + B*(Q+Qxy) */
srcs[0] = p;
+ src_offs[0] = p_off;
srcs[1] = q;
+ src_offs[1] = q_off;
coef[0] = raid6_gfexi[failb-faila];
coef[1] = raid6_gfinv[raid6_gfexp[faila]^raid6_gfexp[failb]];
init_async_submit(submit, ASYNC_TX_FENCE, tx, NULL, NULL, scribble);
- tx = async_sum_product(b, srcs, coef, bytes, submit);
+ tx = async_sum_product(b, b_off, srcs, src_offs, coef, bytes, submit);
/* Dy = P+Pxy+Dx */
srcs[0] = p;
+ src_offs[0] = p_off;
srcs[1] = b;
+ src_offs[1] = b_off;
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);
+ tx = async_xor_offs(a, a_off, srcs, src_offs, 2, bytes, submit);
return tx;
static struct dma_async_tx_descriptor *
__2data_recov_5(int disks, size_t bytes, int faila, int failb,
- struct page **blocks, struct async_submit_ctl *submit)
+ struct page **blocks, unsigned int *offs,
+ struct async_submit_ctl *submit)
{
struct dma_async_tx_descriptor *tx = NULL;
struct page *p, *q, *g, *dp, *dq;
+ unsigned int p_off, q_off, g_off, dp_off, dq_off;
struct page *srcs[2];
+ unsigned int src_offs[2];
unsigned char coef[2];
enum async_tx_flags flags = submit->flags;
dma_async_tx_callback cb_fn = submit->cb_fn;
BUG_ON(good_srcs > 1);
p = blocks[disks-2];
+ p_off = offs[disks-2];
q = blocks[disks-1];
+ q_off = offs[disks-1];
g = blocks[good];
+ g_off = offs[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];
+ dp_off = offs[faila];
dq = blocks[failb];
+ dq_off = offs[failb];
init_async_submit(submit, ASYNC_TX_FENCE, tx, NULL, NULL, scribble);
- tx = async_memcpy(dp, g, 0, 0, bytes, submit);
+ tx = async_memcpy(dp, g, dp_off, g_off, bytes, submit);
init_async_submit(submit, ASYNC_TX_FENCE, tx, NULL, NULL, scribble);
- tx = async_mult(dq, g, raid6_gfexp[good], bytes, submit);
+ tx = async_mult(dq, dq_off, g, g_off,
+ raid6_gfexp[good], bytes, submit);
/* compute P + Pxy */
srcs[0] = dp;
+ src_offs[0] = dp_off;
srcs[1] = p;
+ src_offs[1] = p_off;
init_async_submit(submit, ASYNC_TX_FENCE|ASYNC_TX_XOR_DROP_DST, tx,
NULL, NULL, scribble);
- tx = async_xor(dp, srcs, 0, 2, bytes, submit);
+ tx = async_xor_offs(dp, dp_off, srcs, src_offs, 2, bytes, submit);
/* compute Q + Qxy */
srcs[0] = dq;
+ src_offs[0] = dq_off;
srcs[1] = q;
+ src_offs[1] = q_off;
init_async_submit(submit, ASYNC_TX_FENCE|ASYNC_TX_XOR_DROP_DST, tx,
NULL, NULL, scribble);
- tx = async_xor(dq, srcs, 0, 2, bytes, submit);
+ tx = async_xor_offs(dq, dq_off, srcs, src_offs, 2, bytes, submit);
/* Dx = A*(P+Pxy) + B*(Q+Qxy) */
srcs[0] = dp;
+ src_offs[0] = dp_off;
srcs[1] = dq;
+ src_offs[1] = dq_off;
coef[0] = raid6_gfexi[failb-faila];
coef[1] = raid6_gfinv[raid6_gfexp[faila]^raid6_gfexp[failb]];
init_async_submit(submit, ASYNC_TX_FENCE, tx, NULL, NULL, scribble);
- tx = async_sum_product(dq, srcs, coef, bytes, submit);
+ tx = async_sum_product(dq, dq_off, srcs, src_offs, coef, bytes, submit);
/* Dy = P+Pxy+Dx */
srcs[0] = dp;
+ src_offs[0] = dp_off;
srcs[1] = dq;
+ src_offs[1] = dq_off;
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);
+ tx = async_xor_offs(dp, dp_off, srcs, src_offs, 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 page **blocks, unsigned int *offs,
+ struct async_submit_ctl *submit)
{
struct dma_async_tx_descriptor *tx = NULL;
struct page *p, *q, *dp, *dq;
+ unsigned int p_off, q_off, dp_off, dq_off;
struct page *srcs[2];
+ unsigned int src_offs[2];
unsigned char coef[2];
enum async_tx_flags flags = submit->flags;
dma_async_tx_callback cb_fn = submit->cb_fn;
void *scribble = submit->scribble;
p = blocks[disks-2];
+ p_off = offs[disks-2];
q = blocks[disks-1];
+ q_off = offs[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];
+ dp_off = offs[faila];
blocks[faila] = NULL;
blocks[disks-2] = dp;
+ offs[disks-2] = dp_off;
dq = blocks[failb];
+ dq_off = offs[failb];
blocks[failb] = NULL;
blocks[disks-1] = dq;
+ offs[disks-1] = dq_off;
init_async_submit(submit, ASYNC_TX_FENCE, tx, NULL, NULL, scribble);
- tx = async_gen_syndrome(blocks, 0, disks, bytes, submit);
+ tx = async_gen_syndrome(blocks, offs, disks, bytes, submit);
/* Restore pointer table */
blocks[faila] = dp;
+ offs[faila] = dp_off;
blocks[failb] = dq;
+ offs[failb] = dq_off;
blocks[disks-2] = p;
+ offs[disks-2] = p_off;
blocks[disks-1] = q;
+ offs[disks-1] = q_off;
/* compute P + Pxy */
srcs[0] = dp;
+ src_offs[0] = dp_off;
srcs[1] = p;
+ src_offs[1] = p_off;
init_async_submit(submit, ASYNC_TX_FENCE|ASYNC_TX_XOR_DROP_DST, tx,
NULL, NULL, scribble);
- tx = async_xor(dp, srcs, 0, 2, bytes, submit);
+ tx = async_xor_offs(dp, dp_off, srcs, src_offs, 2, bytes, submit);
/* compute Q + Qxy */
srcs[0] = dq;
+ src_offs[0] = dq_off;
srcs[1] = q;
+ src_offs[1] = q_off;
init_async_submit(submit, ASYNC_TX_FENCE|ASYNC_TX_XOR_DROP_DST, tx,
NULL, NULL, scribble);
- tx = async_xor(dq, srcs, 0, 2, bytes, submit);
+ tx = async_xor_offs(dq, dq_off, srcs, src_offs, 2, bytes, submit);
/* Dx = A*(P+Pxy) + B*(Q+Qxy) */
srcs[0] = dp;
+ src_offs[0] = dp_off;
srcs[1] = dq;
+ src_offs[1] = dq_off;
coef[0] = raid6_gfexi[failb-faila];
coef[1] = raid6_gfinv[raid6_gfexp[faila]^raid6_gfexp[failb]];
init_async_submit(submit, ASYNC_TX_FENCE, tx, NULL, NULL, scribble);
- tx = async_sum_product(dq, srcs, coef, bytes, submit);
+ tx = async_sum_product(dq, dq_off, srcs, src_offs, coef, bytes, submit);
/* Dy = P+Pxy+Dx */
srcs[0] = dp;
+ src_offs[0] = dp_off;
srcs[1] = dq;
+ src_offs[1] = dq_off;
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);
+ tx = async_xor_offs(dp, dp_off, srcs, src_offs, 2, bytes, submit);
return tx;
}
* @faila: first failed drive index
* @failb: second failed drive index
* @blocks: array of source pointers where the last two entries are p and q
+ * @offs: array of offset for pages in blocks
* @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)
+ struct page **blocks, unsigned int *offs,
+ struct async_submit_ctl *submit)
{
void *scribble = submit->scribble;
int non_zero_srcs, i;
if (blocks[i] == NULL)
ptrs[i] = (void *) raid6_empty_zero_page;
else
- ptrs[i] = page_address(blocks[i]);
+ ptrs[i] = page_address(blocks[i]) + offs[i];
raid6_2data_recov(disks, bytes, faila, failb, ptrs);
* explicitly handle the special case of a 4 disk array with
* both data disks missing.
*/
- return __2data_recov_4(disks, bytes, faila, failb, blocks, submit);
+ return __2data_recov_4(disks, bytes, faila, failb,
+ blocks, offs, submit);
case 3:
/* dma devices do not uniformly understand a single
* source pq operation (in contrast to the synchronous
* case), so explicitly handle the special case of a 5 disk
* array with 2 of 3 data disks missing.
*/
- return __2data_recov_5(disks, bytes, faila, failb, blocks, submit);
+ return __2data_recov_5(disks, bytes, faila, failb,
+ blocks, offs, submit);
default:
- return __2data_recov_n(disks, bytes, faila, failb, blocks, submit);
+ return __2data_recov_n(disks, bytes, faila, failb,
+ blocks, offs, submit);
}
}
EXPORT_SYMBOL_GPL(async_raid6_2data_recov);
* @bytes: block size
* @faila: failed drive index
* @blocks: array of source pointers where the last two entries are p and q
+ * @offs: array of offset for pages in blocks
* @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 page **blocks, unsigned int *offs,
+ struct async_submit_ctl *submit)
{
struct dma_async_tx_descriptor *tx = NULL;
struct page *p, *q, *dq;
+ unsigned int p_off, q_off, dq_off;
u8 coef;
enum async_tx_flags flags = submit->flags;
dma_async_tx_callback cb_fn = submit->cb_fn;
void *scribble = submit->scribble;
int good_srcs, good, i;
struct page *srcs[2];
+ unsigned int src_offs[2];
pr_debug("%s: disks: %d len: %zu\n", __func__, disks, bytes);
if (blocks[i] == NULL)
ptrs[i] = (void*)raid6_empty_zero_page;
else
- ptrs[i] = page_address(blocks[i]);
+ ptrs[i] = page_address(blocks[i]) + offs[i];
raid6_datap_recov(disks, bytes, faila, ptrs);
BUG_ON(good_srcs == 0);
p = blocks[disks-2];
+ p_off = offs[disks-2];
q = blocks[disks-1];
+ q_off = offs[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];
+ dq_off = offs[faila];
blocks[faila] = NULL;
blocks[disks-1] = dq;
+ offs[disks-1] = dq_off;
/* in the 4-disk case we only need to perform a single source
* multiplication with the one good data block.
*/
if (good_srcs == 1) {
struct page *g = blocks[good];
+ unsigned int g_off = offs[good];
init_async_submit(submit, ASYNC_TX_FENCE, tx, NULL, NULL,
scribble);
- tx = async_memcpy(p, g, 0, 0, bytes, submit);
+ tx = async_memcpy(p, g, p_off, g_off, bytes, submit);
init_async_submit(submit, ASYNC_TX_FENCE, tx, NULL, NULL,
scribble);
- tx = async_mult(dq, g, raid6_gfexp[good], bytes, submit);
+ tx = async_mult(dq, dq_off, g, g_off,
+ raid6_gfexp[good], bytes, submit);
} else {
init_async_submit(submit, ASYNC_TX_FENCE, tx, NULL, NULL,
scribble);
- tx = async_gen_syndrome(blocks, 0, disks, bytes, submit);
+ tx = async_gen_syndrome(blocks, offs, disks, bytes, submit);
}
/* Restore pointer table */
blocks[faila] = dq;
+ offs[faila] = dq_off;
blocks[disks-1] = q;
+ offs[disks-1] = q_off;
/* calculate g^{-faila} */
coef = raid6_gfinv[raid6_gfexp[faila]];
srcs[0] = dq;
+ src_offs[0] = dq_off;
srcs[1] = q;
+ src_offs[1] = q_off;
init_async_submit(submit, ASYNC_TX_FENCE|ASYNC_TX_XOR_DROP_DST, tx,
NULL, NULL, scribble);
- tx = async_xor(dq, srcs, 0, 2, bytes, submit);
+ tx = async_xor_offs(dq, dq_off, srcs, src_offs, 2, bytes, submit);
init_async_submit(submit, ASYNC_TX_FENCE, tx, NULL, NULL, scribble);
- tx = async_mult(dq, dq, coef, bytes, submit);
+ tx = async_mult(dq, dq_off, dq, dq_off, coef, bytes, submit);
srcs[0] = p;
+ src_offs[0] = p_off;
srcs[1] = dq;
+ src_offs[1] = dq_off;
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);
+ tx = async_xor_offs(p, p_off, srcs, src_offs, 2, bytes, submit);
return tx;
}
git.samba.org / sfrench / cifs-2.6.git / blobdiff