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path: root/drivers/s390/block/scm_blk_cluster.c
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Diffstat (limited to 'drivers/s390/block/scm_blk_cluster.c')
-rw-r--r--drivers/s390/block/scm_blk_cluster.c69
1 files changed, 47 insertions, 22 deletions
diff --git a/drivers/s390/block/scm_blk_cluster.c b/drivers/s390/block/scm_blk_cluster.c
index 9aae909d47a5..09db45296eed 100644
--- a/drivers/s390/block/scm_blk_cluster.c
+++ b/drivers/s390/block/scm_blk_cluster.c
@@ -57,39 +57,52 @@ void scm_request_cluster_init(struct scm_request *scmrq)
scmrq->cluster.state = CLUSTER_NONE;
}
-static bool clusters_intersect(struct scm_request *A, struct scm_request *B)
+static bool clusters_intersect(struct request *A, struct request *B)
{
unsigned long firstA, lastA, firstB, lastB;
- firstA = ((u64) blk_rq_pos(A->request) << 9) / CLUSTER_SIZE;
- lastA = (((u64) blk_rq_pos(A->request) << 9) +
- blk_rq_bytes(A->request) - 1) / CLUSTER_SIZE;
+ firstA = ((u64) blk_rq_pos(A) << 9) / CLUSTER_SIZE;
+ lastA = (((u64) blk_rq_pos(A) << 9) +
+ blk_rq_bytes(A) - 1) / CLUSTER_SIZE;
- firstB = ((u64) blk_rq_pos(B->request) << 9) / CLUSTER_SIZE;
- lastB = (((u64) blk_rq_pos(B->request) << 9) +
- blk_rq_bytes(B->request) - 1) / CLUSTER_SIZE;
+ firstB = ((u64) blk_rq_pos(B) << 9) / CLUSTER_SIZE;
+ lastB = (((u64) blk_rq_pos(B) << 9) +
+ blk_rq_bytes(B) - 1) / CLUSTER_SIZE;
return (firstB <= lastA && firstA <= lastB);
}
bool scm_reserve_cluster(struct scm_request *scmrq)
{
+ struct request *req = scmrq->request[scmrq->aob->request.msb_count];
struct scm_blk_dev *bdev = scmrq->bdev;
struct scm_request *iter;
+ int pos, add = 1;
if (write_cluster_size == 0)
return true;
spin_lock(&bdev->lock);
list_for_each_entry(iter, &bdev->cluster_list, cluster.list) {
- if (clusters_intersect(scmrq, iter) &&
- (rq_data_dir(scmrq->request) == WRITE ||
- rq_data_dir(iter->request) == WRITE)) {
- spin_unlock(&bdev->lock);
- return false;
+ if (iter == scmrq) {
+ /*
+ * We don't have to use clusters_intersect here, since
+ * cluster requests are always started separately.
+ */
+ add = 0;
+ continue;
+ }
+ for (pos = 0; pos <= iter->aob->request.msb_count; pos++) {
+ if (clusters_intersect(req, iter->request[pos]) &&
+ (rq_data_dir(req) == WRITE ||
+ rq_data_dir(iter->request[pos]) == WRITE)) {
+ spin_unlock(&bdev->lock);
+ return false;
+ }
}
}
- list_add(&scmrq->cluster.list, &bdev->cluster_list);
+ if (add)
+ list_add(&scmrq->cluster.list, &bdev->cluster_list);
spin_unlock(&bdev->lock);
return true;
@@ -114,14 +127,14 @@ void scm_blk_dev_cluster_setup(struct scm_blk_dev *bdev)
blk_queue_io_opt(bdev->rq, CLUSTER_SIZE);
}
-static void scm_prepare_cluster_request(struct scm_request *scmrq)
+static int scm_prepare_cluster_request(struct scm_request *scmrq)
{
struct scm_blk_dev *bdev = scmrq->bdev;
struct scm_device *scmdev = bdev->gendisk->private_data;
- struct request *req = scmrq->request;
- struct aidaw *aidaw = scmrq->aidaw;
+ struct request *req = scmrq->request[0];
struct msb *msb = &scmrq->aob->msb[0];
struct req_iterator iter;
+ struct aidaw *aidaw;
struct bio_vec bv;
int i = 0;
u64 addr;
@@ -131,11 +144,9 @@ static void scm_prepare_cluster_request(struct scm_request *scmrq)
scmrq->cluster.state = CLUSTER_READ;
/* fall through */
case CLUSTER_READ:
- scmrq->aob->request.msb_count = 1;
msb->bs = MSB_BS_4K;
msb->oc = MSB_OC_READ;
msb->flags = MSB_FLAG_IDA;
- msb->data_addr = (u64) aidaw;
msb->blk_count = write_cluster_size;
addr = scmdev->address + ((u64) blk_rq_pos(req) << 9);
@@ -146,6 +157,12 @@ static void scm_prepare_cluster_request(struct scm_request *scmrq)
CLUSTER_SIZE))
msb->blk_count = 2 * write_cluster_size;
+ aidaw = scm_aidaw_fetch(scmrq, msb->blk_count * PAGE_SIZE);
+ if (!aidaw)
+ return -ENOMEM;
+
+ scmrq->aob->request.msb_count = 1;
+ msb->data_addr = (u64) aidaw;
for (i = 0; i < msb->blk_count; i++) {
aidaw->data_addr = (u64) scmrq->cluster.buf[i];
aidaw++;
@@ -153,6 +170,7 @@ static void scm_prepare_cluster_request(struct scm_request *scmrq)
break;
case CLUSTER_WRITE:
+ aidaw = (void *) msb->data_addr;
msb->oc = MSB_OC_WRITE;
for (addr = msb->scm_addr;
@@ -173,22 +191,29 @@ static void scm_prepare_cluster_request(struct scm_request *scmrq)
}
break;
}
+ return 0;
}
bool scm_need_cluster_request(struct scm_request *scmrq)
{
- if (rq_data_dir(scmrq->request) == READ)
+ int pos = scmrq->aob->request.msb_count;
+
+ if (rq_data_dir(scmrq->request[pos]) == READ)
return false;
- return blk_rq_bytes(scmrq->request) < CLUSTER_SIZE;
+ return blk_rq_bytes(scmrq->request[pos]) < CLUSTER_SIZE;
}
/* Called with queue lock held. */
void scm_initiate_cluster_request(struct scm_request *scmrq)
{
- scm_prepare_cluster_request(scmrq);
+ if (scm_prepare_cluster_request(scmrq))
+ goto requeue;
if (eadm_start_aob(scmrq->aob))
- scm_request_requeue(scmrq);
+ goto requeue;
+ return;
+requeue:
+ scm_request_requeue(scmrq);
}
bool scm_test_cluster_request(struct scm_request *scmrq)