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authorYufen Yu <yuyufen@huawei.com>2020-08-20 16:22:10 +0300
committerSong Liu <songliubraving@fb.com>2020-09-25 02:44:44 +0300
commitd69454bc9fdfb63e84152e0533454079ea3e38a3 (patch)
tree1b2f5815eeb41679cb22e319b423c2d28fc37df5 /crypto/async_tx
parenta7c224a820c36192888ad0beb11c2e612264f533 (diff)
downloadlinux-d69454bc9fdfb63e84152e0533454079ea3e38a3.tar.xz
md/raid6: let syndrome computor support different page offset
For now, syndrome compute functions require common offset in the pages array. However, we expect them to support different offset when try to use shared page in the following. Simplily covert them by adding page offset where each page address are referred. Since the only caller of async_gen_syndrome() and async_syndrome_val() are in raid6, we don't want to reserve the old interface but modify the interface directly. After that, replacing old interfaces with new ones for raid6 and raid6test. Signed-off-by: Yufen Yu <yuyufen@huawei.com> Signed-off-by: Song Liu <songliubraving@fb.com>
Diffstat (limited to 'crypto/async_tx')
-rw-r--r--crypto/async_tx/async_pq.c72
-rw-r--r--crypto/async_tx/raid6test.c24
2 files changed, 64 insertions, 32 deletions
diff --git a/crypto/async_tx/async_pq.c b/crypto/async_tx/async_pq.c
index 341ece61cf9b..f9cdc5e91664 100644
--- a/crypto/async_tx/async_pq.c
+++ b/crypto/async_tx/async_pq.c
@@ -104,7 +104,7 @@ do_async_gen_syndrome(struct dma_chan *chan,
* do_sync_gen_syndrome - synchronously calculate a raid6 syndrome
*/
static void
-do_sync_gen_syndrome(struct page **blocks, unsigned int offset, int disks,
+do_sync_gen_syndrome(struct page **blocks, unsigned int *offsets, int disks,
size_t len, struct async_submit_ctl *submit)
{
void **srcs;
@@ -121,7 +121,8 @@ do_sync_gen_syndrome(struct page **blocks, unsigned int offset, int disks,
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;
+ srcs[i] = page_address(blocks[i]) + offsets[i];
+
if (i < disks - 2) {
stop = i;
if (start == -1)
@@ -138,10 +139,23 @@ do_sync_gen_syndrome(struct page **blocks, unsigned int offset, int disks,
async_tx_sync_epilog(submit);
}
+static inline bool
+is_dma_pq_aligned_offs(struct dma_device *dev, unsigned int *offs,
+ int src_cnt, size_t len)
+{
+ int i;
+
+ for (i = 0; i < src_cnt; i++) {
+ if (!is_dma_pq_aligned(dev, offs[i], 0, len))
+ return false;
+ }
+ return true;
+}
+
/**
* 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
+ * @offsets: offset array 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
@@ -160,7 +174,7 @@ do_sync_gen_syndrome(struct page **blocks, unsigned int offset, int disks,
* path.
*/
struct dma_async_tx_descriptor *
-async_gen_syndrome(struct page **blocks, unsigned int offset, int disks,
+async_gen_syndrome(struct page **blocks, unsigned int *offsets, int disks,
size_t len, struct async_submit_ctl *submit)
{
int src_cnt = disks - 2;
@@ -179,7 +193,7 @@ async_gen_syndrome(struct page **blocks, unsigned int offset, int disks,
if (unmap && !(submit->flags & ASYNC_TX_PQ_XOR_DST) &&
(src_cnt <= dma_maxpq(device, 0) ||
dma_maxpq(device, DMA_PREP_CONTINUE) > 0) &&
- is_dma_pq_aligned(device, offset, 0, len)) {
+ is_dma_pq_aligned_offs(device, offsets, disks, len)) {
struct dma_async_tx_descriptor *tx;
enum dma_ctrl_flags dma_flags = 0;
unsigned char coefs[MAX_DISKS];
@@ -196,8 +210,8 @@ async_gen_syndrome(struct page **blocks, unsigned int offset, int disks,
for (i = 0, j = 0; i < src_cnt; i++) {
if (blocks[i] == NULL)
continue;
- unmap->addr[j] = dma_map_page(device->dev, blocks[i], offset,
- len, DMA_TO_DEVICE);
+ unmap->addr[j] = dma_map_page(device->dev, blocks[i],
+ offsets[i], len, DMA_TO_DEVICE);
coefs[j] = raid6_gfexp[i];
unmap->to_cnt++;
j++;
@@ -210,7 +224,8 @@ async_gen_syndrome(struct page **blocks, unsigned int offset, int disks,
unmap->bidi_cnt++;
if (P(blocks, disks))
unmap->addr[j++] = dma_map_page(device->dev, P(blocks, disks),
- offset, len, DMA_BIDIRECTIONAL);
+ P(offsets, disks),
+ len, DMA_BIDIRECTIONAL);
else {
unmap->addr[j++] = 0;
dma_flags |= DMA_PREP_PQ_DISABLE_P;
@@ -219,7 +234,8 @@ async_gen_syndrome(struct page **blocks, unsigned int offset, int disks,
unmap->bidi_cnt++;
if (Q(blocks, disks))
unmap->addr[j++] = dma_map_page(device->dev, Q(blocks, disks),
- offset, len, DMA_BIDIRECTIONAL);
+ Q(offsets, disks),
+ len, DMA_BIDIRECTIONAL);
else {
unmap->addr[j++] = 0;
dma_flags |= DMA_PREP_PQ_DISABLE_Q;
@@ -240,13 +256,13 @@ async_gen_syndrome(struct page **blocks, unsigned int offset, int disks,
if (!P(blocks, disks)) {
P(blocks, disks) = pq_scribble_page;
- BUG_ON(len + offset > PAGE_SIZE);
+ P(offsets, disks) = 0;
}
if (!Q(blocks, disks)) {
Q(blocks, disks) = pq_scribble_page;
- BUG_ON(len + offset > PAGE_SIZE);
+ Q(offsets, disks) = 0;
}
- do_sync_gen_syndrome(blocks, offset, disks, len, submit);
+ do_sync_gen_syndrome(blocks, offsets, disks, len, submit);
return NULL;
}
@@ -270,6 +286,7 @@ pq_val_chan(struct async_submit_ctl *submit, struct page **blocks, int disks, si
* @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
+ * @s_off: spare buffer page offset
* @submit: submission / completion modifiers
*
* The same notes from async_gen_syndrome apply to the 'blocks',
@@ -278,9 +295,9 @@ pq_val_chan(struct async_submit_ctl *submit, struct page **blocks, int disks, si
* specified.
*/
struct dma_async_tx_descriptor *
-async_syndrome_val(struct page **blocks, unsigned int offset, int disks,
+async_syndrome_val(struct page **blocks, unsigned int *offsets, int disks,
size_t len, enum sum_check_flags *pqres, struct page *spare,
- struct async_submit_ctl *submit)
+ unsigned int s_off, struct async_submit_ctl *submit)
{
struct dma_chan *chan = pq_val_chan(submit, blocks, disks, len);
struct dma_device *device = chan ? chan->device : NULL;
@@ -295,7 +312,7 @@ async_syndrome_val(struct page **blocks, unsigned int offset, int disks,
unmap = dmaengine_get_unmap_data(device->dev, disks, GFP_NOWAIT);
if (unmap && disks <= dma_maxpq(device, 0) &&
- is_dma_pq_aligned(device, offset, 0, len)) {
+ is_dma_pq_aligned_offs(device, offsets, disks, len)) {
struct device *dev = device->dev;
dma_addr_t pq[2];
int i, j = 0, src_cnt = 0;
@@ -307,7 +324,7 @@ async_syndrome_val(struct page **blocks, unsigned int offset, int disks,
for (i = 0; i < disks-2; i++)
if (likely(blocks[i])) {
unmap->addr[j] = dma_map_page(dev, blocks[i],
- offset, len,
+ offsets[i], len,
DMA_TO_DEVICE);
coefs[j] = raid6_gfexp[i];
unmap->to_cnt++;
@@ -320,7 +337,7 @@ async_syndrome_val(struct page **blocks, unsigned int offset, int disks,
dma_flags |= DMA_PREP_PQ_DISABLE_P;
} else {
pq[0] = dma_map_page(dev, P(blocks, disks),
- offset, len,
+ P(offsets, disks), len,
DMA_TO_DEVICE);
unmap->addr[j++] = pq[0];
unmap->to_cnt++;
@@ -330,7 +347,7 @@ async_syndrome_val(struct page **blocks, unsigned int offset, int disks,
dma_flags |= DMA_PREP_PQ_DISABLE_Q;
} else {
pq[1] = dma_map_page(dev, Q(blocks, disks),
- offset, len,
+ Q(offsets, disks), len,
DMA_TO_DEVICE);
unmap->addr[j++] = pq[1];
unmap->to_cnt++;
@@ -355,7 +372,9 @@ async_syndrome_val(struct page **blocks, unsigned int offset, int disks,
async_tx_submit(chan, tx, submit);
} else {
struct page *p_src = P(blocks, disks);
+ unsigned int p_off = P(offsets, disks);
struct page *q_src = Q(blocks, disks);
+ unsigned int q_off = Q(offsets, disks);
enum async_tx_flags flags_orig = submit->flags;
dma_async_tx_callback cb_fn_orig = submit->cb_fn;
void *scribble = submit->scribble;
@@ -381,27 +400,32 @@ async_syndrome_val(struct page **blocks, unsigned int offset, int disks,
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);
+ tx = async_xor_offs(spare, s_off,
+ blocks, offsets, disks-2, len, submit);
async_tx_quiesce(&tx);
- p = page_address(p_src) + offset;
- s = page_address(spare) + offset;
+ p = page_address(p_src) + p_off;
+ s = page_address(spare) + s_off;
*pqres |= !!memcmp(p, s, len) << SUM_CHECK_P;
}
if (q_src) {
P(blocks, disks) = NULL;
Q(blocks, disks) = spare;
+ Q(offsets, disks) = s_off;
init_async_submit(submit, 0, NULL, NULL, NULL, scribble);
- tx = async_gen_syndrome(blocks, offset, disks, len, submit);
+ tx = async_gen_syndrome(blocks, offsets, disks,
+ len, submit);
async_tx_quiesce(&tx);
- q = page_address(q_src) + offset;
- s = page_address(spare) + offset;
+ q = page_address(q_src) + q_off;
+ s = page_address(spare) + s_off;
*pqres |= !!memcmp(q, s, len) << SUM_CHECK_Q;
}
/* restore P, Q and submit */
P(blocks, disks) = p_src;
+ P(offsets, disks) = p_off;
Q(blocks, disks) = q_src;
+ Q(offsets, disks) = q_off;
submit->cb_fn = cb_fn_orig;
submit->cb_param = cb_param_orig;
diff --git a/crypto/async_tx/raid6test.c b/crypto/async_tx/raid6test.c
index 14e73dcd7475..ef4e6e68f759 100644
--- a/crypto/async_tx/raid6test.c
+++ b/crypto/async_tx/raid6test.c
@@ -18,6 +18,7 @@
#define NDISKS 64 /* Including P and Q */
static struct page *dataptrs[NDISKS];
+unsigned int dataoffs[NDISKS];
static addr_conv_t addr_conv[NDISKS];
static struct page *data[NDISKS+3];
static struct page *spare;
@@ -38,6 +39,7 @@ static void makedata(int disks)
for (i = 0; i < disks; i++) {
prandom_bytes(page_address(data[i]), PAGE_SIZE);
dataptrs[i] = data[i];
+ dataoffs[i] = 0;
}
}
@@ -52,7 +54,8 @@ static char disk_type(int d, int disks)
}
/* Recover two failed blocks. */
-static void raid6_dual_recov(int disks, size_t bytes, int faila, int failb, struct page **ptrs)
+static void raid6_dual_recov(int disks, size_t bytes, int faila, int failb,
+ struct page **ptrs, unsigned int *offs)
{
struct async_submit_ctl submit;
struct completion cmp;
@@ -66,7 +69,8 @@ static void raid6_dual_recov(int disks, size_t bytes, int faila, int failb, stru
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);
+ tx = async_gen_syndrome(ptrs, offs,
+ disks, bytes, &submit);
} else {
struct page *blocks[NDISKS];
struct page *dest;
@@ -89,22 +93,26 @@ static void raid6_dual_recov(int disks, size_t bytes, int faila, int failb, stru
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);
+ tx = async_gen_syndrome(ptrs, offs,
+ 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);
+ 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);
+ 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);
+ tx = async_syndrome_val(ptrs, offs,
+ disks, bytes, &result, spare, 0, &submit);
async_tx_issue_pending(tx);
if (wait_for_completion_timeout(&cmp, msecs_to_jiffies(3000)) == 0)
@@ -126,7 +134,7 @@ static int test_disks(int i, int j, int disks)
dataptrs[i] = recovi;
dataptrs[j] = recovj;
- raid6_dual_recov(disks, PAGE_SIZE, i, j, dataptrs);
+ raid6_dual_recov(disks, PAGE_SIZE, i, j, dataptrs, dataoffs);
erra = memcmp(page_address(data[i]), page_address(recovi), PAGE_SIZE);
errb = memcmp(page_address(data[j]), page_address(recovj), PAGE_SIZE);
@@ -162,7 +170,7 @@ static int test(int disks, int *tests)
/* 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);
+ tx = async_gen_syndrome(dataptrs, dataoffs, disks, PAGE_SIZE, &submit);
async_tx_issue_pending(tx);
if (wait_for_completion_timeout(&cmp, msecs_to_jiffies(3000)) == 0) {