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s390/scm: remove cluster option
Remove CONFIG_SCM_BLOCK_CLUSTER_WRITE and related code. This quirk is no longer needed on current hardware. Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Sebastian Ott
Martin Schwidefsky
parent
d12a3d6036
commit
94d26bfcf3
@ -82,10 +82,3 @@ config SCM_BLOCK
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To compile this driver as a module, choose M here: the
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module will be called scm_block.
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config SCM_BLOCK_CLUSTER_WRITE
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def_bool y
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prompt "SCM force cluster writes"
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depends on SCM_BLOCK
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help
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Force writes to Storage Class Memory (SCM) to be in done in clusters.
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@ -19,7 +19,4 @@ obj-$(CONFIG_BLK_DEV_XPRAM) += xpram.o
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obj-$(CONFIG_DCSSBLK) += dcssblk.o
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scm_block-objs := scm_drv.o scm_blk.o
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ifdef CONFIG_SCM_BLOCK_CLUSTER_WRITE
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scm_block-objs += scm_blk_cluster.o
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endif
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obj-$(CONFIG_SCM_BLOCK) += scm_block.o
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@ -42,7 +42,6 @@ static void __scm_free_rq(struct scm_request *scmrq)
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struct aob_rq_header *aobrq = to_aobrq(scmrq);
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free_page((unsigned long) scmrq->aob);
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__scm_free_rq_cluster(scmrq);
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kfree(scmrq->request);
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kfree(aobrq);
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}
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@ -82,9 +81,6 @@ static int __scm_alloc_rq(void)
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if (!scmrq->request)
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goto free;
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if (__scm_alloc_rq_cluster(scmrq))
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goto free;
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INIT_LIST_HEAD(&scmrq->list);
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spin_lock_irq(&list_lock);
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list_add(&scmrq->list, &inactive_requests);
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@ -234,7 +230,6 @@ static inline void scm_request_init(struct scm_blk_dev *bdev,
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scmrq->error = 0;
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/* We don't use all msbs - place aidaws at the end of the aob page. */
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scmrq->next_aidaw = (void *) &aob->msb[nr_requests_per_io];
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scm_request_cluster_init(scmrq);
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}
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static void scm_ensure_queue_restart(struct scm_blk_dev *bdev)
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@ -246,12 +241,11 @@ static void scm_ensure_queue_restart(struct scm_blk_dev *bdev)
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blk_delay_queue(bdev->rq, SCM_QUEUE_DELAY);
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}
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void scm_request_requeue(struct scm_request *scmrq)
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static void scm_request_requeue(struct scm_request *scmrq)
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{
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struct scm_blk_dev *bdev = scmrq->bdev;
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int i;
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scm_release_cluster(scmrq);
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for (i = 0; i < nr_requests_per_io && scmrq->request[i]; i++)
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blk_requeue_request(bdev->rq, scmrq->request[i]);
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@ -260,12 +254,11 @@ void scm_request_requeue(struct scm_request *scmrq)
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scm_ensure_queue_restart(bdev);
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}
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void scm_request_finish(struct scm_request *scmrq)
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static void scm_request_finish(struct scm_request *scmrq)
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{
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struct scm_blk_dev *bdev = scmrq->bdev;
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int i;
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scm_release_cluster(scmrq);
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for (i = 0; i < nr_requests_per_io && scmrq->request[i]; i++)
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blk_end_request_all(scmrq->request[i], scmrq->error);
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@ -313,31 +306,6 @@ static void scm_blk_request(struct request_queue *rq)
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}
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scm_request_set(scmrq, req);
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if (!scm_reserve_cluster(scmrq)) {
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SCM_LOG(5, "cluster busy");
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scm_request_set(scmrq, NULL);
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if (scmrq->aob->request.msb_count)
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goto out;
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scm_request_done(scmrq);
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return;
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}
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if (scm_need_cluster_request(scmrq)) {
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if (scmrq->aob->request.msb_count) {
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/* Start cluster requests separately. */
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scm_request_set(scmrq, NULL);
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if (scm_request_start(scmrq))
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return;
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} else {
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atomic_inc(&bdev->queued_reqs);
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blk_start_request(req);
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scm_initiate_cluster_request(scmrq);
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}
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scmrq = NULL;
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continue;
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}
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if (scm_request_prepare(scmrq)) {
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SCM_LOG(5, "aidaw alloc failed");
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scm_request_set(scmrq, NULL);
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@ -444,12 +412,6 @@ static void scm_blk_tasklet(struct scm_blk_dev *bdev)
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continue;
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}
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if (scm_test_cluster_request(scmrq)) {
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scm_cluster_request_irq(scmrq);
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spin_lock_irqsave(&bdev->lock, flags);
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continue;
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}
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scm_request_finish(scmrq);
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spin_lock_irqsave(&bdev->lock, flags);
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}
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@ -498,7 +460,6 @@ int scm_blk_dev_setup(struct scm_blk_dev *bdev, struct scm_device *scmdev)
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blk_queue_max_segments(rq, nr_max_blk);
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queue_flag_set_unlocked(QUEUE_FLAG_NONROT, rq);
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queue_flag_clear_unlocked(QUEUE_FLAG_ADD_RANDOM, rq);
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scm_blk_dev_cluster_setup(bdev);
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bdev->gendisk = alloc_disk(SCM_NR_PARTS);
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if (!bdev->gendisk)
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@ -558,7 +519,7 @@ static bool __init scm_blk_params_valid(void)
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if (!nr_requests_per_io || nr_requests_per_io > 64)
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return false;
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return scm_cluster_size_valid();
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return true;
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}
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static int __init scm_blk_init(void)
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@ -23,9 +23,6 @@ struct scm_blk_dev {
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atomic_t queued_reqs;
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enum {SCM_OPER, SCM_WR_PROHIBIT} state;
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struct list_head finished_requests;
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#ifdef CONFIG_SCM_BLOCK_CLUSTER_WRITE
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struct list_head cluster_list;
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#endif
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};
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struct scm_request {
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@ -36,13 +33,6 @@ struct scm_request {
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struct list_head list;
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u8 retries;
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int error;
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#ifdef CONFIG_SCM_BLOCK_CLUSTER_WRITE
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struct {
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enum {CLUSTER_NONE, CLUSTER_READ, CLUSTER_WRITE} state;
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struct list_head list;
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void **buf;
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} cluster;
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#endif
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};
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#define to_aobrq(rq) container_of((void *) rq, struct aob_rq_header, data)
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@ -52,55 +42,11 @@ void scm_blk_dev_cleanup(struct scm_blk_dev *);
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void scm_blk_set_available(struct scm_blk_dev *);
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void scm_blk_irq(struct scm_device *, void *, int);
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void scm_request_finish(struct scm_request *);
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void scm_request_requeue(struct scm_request *);
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struct aidaw *scm_aidaw_fetch(struct scm_request *scmrq, unsigned int bytes);
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int scm_drv_init(void);
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void scm_drv_cleanup(void);
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#ifdef CONFIG_SCM_BLOCK_CLUSTER_WRITE
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void __scm_free_rq_cluster(struct scm_request *);
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int __scm_alloc_rq_cluster(struct scm_request *);
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void scm_request_cluster_init(struct scm_request *);
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bool scm_reserve_cluster(struct scm_request *);
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void scm_release_cluster(struct scm_request *);
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void scm_blk_dev_cluster_setup(struct scm_blk_dev *);
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bool scm_need_cluster_request(struct scm_request *);
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void scm_initiate_cluster_request(struct scm_request *);
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void scm_cluster_request_irq(struct scm_request *);
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bool scm_test_cluster_request(struct scm_request *);
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bool scm_cluster_size_valid(void);
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#else /* CONFIG_SCM_BLOCK_CLUSTER_WRITE */
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static inline void __scm_free_rq_cluster(struct scm_request *scmrq) {}
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static inline int __scm_alloc_rq_cluster(struct scm_request *scmrq)
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{
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return 0;
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}
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static inline void scm_request_cluster_init(struct scm_request *scmrq) {}
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static inline bool scm_reserve_cluster(struct scm_request *scmrq)
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{
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return true;
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}
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static inline void scm_release_cluster(struct scm_request *scmrq) {}
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static inline void scm_blk_dev_cluster_setup(struct scm_blk_dev *bdev) {}
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static inline bool scm_need_cluster_request(struct scm_request *scmrq)
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{
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return false;
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}
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static inline void scm_initiate_cluster_request(struct scm_request *scmrq) {}
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static inline void scm_cluster_request_irq(struct scm_request *scmrq) {}
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static inline bool scm_test_cluster_request(struct scm_request *scmrq)
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{
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return false;
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}
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static inline bool scm_cluster_size_valid(void)
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{
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return true;
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}
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#endif /* CONFIG_SCM_BLOCK_CLUSTER_WRITE */
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extern debug_info_t *scm_debug;
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#define SCM_LOG(imp, txt) do { \
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@ -1,255 +0,0 @@
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/*
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* Block driver for s390 storage class memory.
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*
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* Copyright IBM Corp. 2012
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* Author(s): Sebastian Ott <sebott@linux.vnet.ibm.com>
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*/
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#include <linux/spinlock.h>
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#include <linux/module.h>
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#include <linux/blkdev.h>
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#include <linux/genhd.h>
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#include <linux/slab.h>
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#include <linux/list.h>
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#include <asm/eadm.h>
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#include "scm_blk.h"
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static unsigned int write_cluster_size = 64;
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module_param(write_cluster_size, uint, S_IRUGO);
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MODULE_PARM_DESC(write_cluster_size,
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"Number of pages used for contiguous writes.");
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#define CLUSTER_SIZE (write_cluster_size * PAGE_SIZE)
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void __scm_free_rq_cluster(struct scm_request *scmrq)
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{
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int i;
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if (!scmrq->cluster.buf)
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return;
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for (i = 0; i < 2 * write_cluster_size; i++)
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free_page((unsigned long) scmrq->cluster.buf[i]);
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kfree(scmrq->cluster.buf);
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}
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int __scm_alloc_rq_cluster(struct scm_request *scmrq)
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{
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int i;
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scmrq->cluster.buf = kzalloc(sizeof(void *) * 2 * write_cluster_size,
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GFP_KERNEL);
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if (!scmrq->cluster.buf)
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return -ENOMEM;
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for (i = 0; i < 2 * write_cluster_size; i++) {
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scmrq->cluster.buf[i] = (void *) get_zeroed_page(GFP_DMA);
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if (!scmrq->cluster.buf[i])
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return -ENOMEM;
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}
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INIT_LIST_HEAD(&scmrq->cluster.list);
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return 0;
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}
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void scm_request_cluster_init(struct scm_request *scmrq)
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{
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scmrq->cluster.state = CLUSTER_NONE;
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}
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static bool clusters_intersect(struct request *A, struct request *B)
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{
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unsigned long firstA, lastA, firstB, lastB;
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firstA = ((u64) blk_rq_pos(A) << 9) / CLUSTER_SIZE;
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lastA = (((u64) blk_rq_pos(A) << 9) +
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blk_rq_bytes(A) - 1) / CLUSTER_SIZE;
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firstB = ((u64) blk_rq_pos(B) << 9) / CLUSTER_SIZE;
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lastB = (((u64) blk_rq_pos(B) << 9) +
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blk_rq_bytes(B) - 1) / CLUSTER_SIZE;
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return (firstB <= lastA && firstA <= lastB);
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}
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bool scm_reserve_cluster(struct scm_request *scmrq)
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{
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struct request *req = scmrq->request[scmrq->aob->request.msb_count];
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struct scm_blk_dev *bdev = scmrq->bdev;
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struct scm_request *iter;
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int pos, add = 1;
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if (write_cluster_size == 0)
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return true;
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spin_lock(&bdev->lock);
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list_for_each_entry(iter, &bdev->cluster_list, cluster.list) {
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if (iter == scmrq) {
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/*
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* We don't have to use clusters_intersect here, since
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* cluster requests are always started separately.
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*/
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add = 0;
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continue;
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}
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for (pos = 0; pos < iter->aob->request.msb_count; pos++) {
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if (clusters_intersect(req, iter->request[pos]) &&
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(rq_data_dir(req) == WRITE ||
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rq_data_dir(iter->request[pos]) == WRITE)) {
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spin_unlock(&bdev->lock);
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return false;
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}
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}
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}
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if (add)
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list_add(&scmrq->cluster.list, &bdev->cluster_list);
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spin_unlock(&bdev->lock);
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return true;
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}
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void scm_release_cluster(struct scm_request *scmrq)
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{
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struct scm_blk_dev *bdev = scmrq->bdev;
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unsigned long flags;
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if (write_cluster_size == 0)
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return;
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spin_lock_irqsave(&bdev->lock, flags);
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list_del(&scmrq->cluster.list);
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spin_unlock_irqrestore(&bdev->lock, flags);
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}
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void scm_blk_dev_cluster_setup(struct scm_blk_dev *bdev)
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{
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INIT_LIST_HEAD(&bdev->cluster_list);
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blk_queue_io_opt(bdev->rq, CLUSTER_SIZE);
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}
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static int scm_prepare_cluster_request(struct scm_request *scmrq)
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{
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struct scm_blk_dev *bdev = scmrq->bdev;
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struct scm_device *scmdev = bdev->gendisk->private_data;
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struct request *req = scmrq->request[0];
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struct msb *msb = &scmrq->aob->msb[0];
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struct req_iterator iter;
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struct aidaw *aidaw;
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struct bio_vec bv;
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int i = 0;
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u64 addr;
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switch (scmrq->cluster.state) {
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case CLUSTER_NONE:
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scmrq->cluster.state = CLUSTER_READ;
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/* fall through */
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case CLUSTER_READ:
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msb->bs = MSB_BS_4K;
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msb->oc = MSB_OC_READ;
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msb->flags = MSB_FLAG_IDA;
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msb->blk_count = write_cluster_size;
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addr = scmdev->address + ((u64) blk_rq_pos(req) << 9);
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msb->scm_addr = round_down(addr, CLUSTER_SIZE);
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if (msb->scm_addr !=
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round_down(addr + (u64) blk_rq_bytes(req) - 1,
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CLUSTER_SIZE))
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msb->blk_count = 2 * write_cluster_size;
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aidaw = scm_aidaw_fetch(scmrq, msb->blk_count * PAGE_SIZE);
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if (!aidaw)
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return -ENOMEM;
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scmrq->aob->request.msb_count = 1;
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msb->data_addr = (u64) aidaw;
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for (i = 0; i < msb->blk_count; i++) {
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aidaw->data_addr = (u64) scmrq->cluster.buf[i];
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aidaw++;
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}
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break;
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case CLUSTER_WRITE:
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aidaw = (void *) msb->data_addr;
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msb->oc = MSB_OC_WRITE;
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for (addr = msb->scm_addr;
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addr < scmdev->address + ((u64) blk_rq_pos(req) << 9);
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addr += PAGE_SIZE) {
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aidaw->data_addr = (u64) scmrq->cluster.buf[i];
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aidaw++;
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i++;
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}
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rq_for_each_segment(bv, req, iter) {
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aidaw->data_addr = (u64) page_address(bv.bv_page);
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aidaw++;
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i++;
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}
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for (; i < msb->blk_count; i++) {
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aidaw->data_addr = (u64) scmrq->cluster.buf[i];
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aidaw++;
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}
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break;
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}
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return 0;
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}
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bool scm_need_cluster_request(struct scm_request *scmrq)
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{
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int pos = scmrq->aob->request.msb_count;
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if (rq_data_dir(scmrq->request[pos]) == READ)
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return false;
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return blk_rq_bytes(scmrq->request[pos]) < CLUSTER_SIZE;
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}
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/* Called with queue lock held. */
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void scm_initiate_cluster_request(struct scm_request *scmrq)
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{
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if (scm_prepare_cluster_request(scmrq))
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goto requeue;
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if (eadm_start_aob(scmrq->aob))
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goto requeue;
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return;
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requeue:
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scm_request_requeue(scmrq);
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}
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bool scm_test_cluster_request(struct scm_request *scmrq)
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{
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return scmrq->cluster.state != CLUSTER_NONE;
|
||||
}
|
||||
|
||||
void scm_cluster_request_irq(struct scm_request *scmrq)
|
||||
{
|
||||
struct scm_blk_dev *bdev = scmrq->bdev;
|
||||
unsigned long flags;
|
||||
|
||||
switch (scmrq->cluster.state) {
|
||||
case CLUSTER_NONE:
|
||||
BUG();
|
||||
break;
|
||||
case CLUSTER_READ:
|
||||
if (scmrq->error) {
|
||||
scm_request_finish(scmrq);
|
||||
break;
|
||||
}
|
||||
scmrq->cluster.state = CLUSTER_WRITE;
|
||||
spin_lock_irqsave(&bdev->rq_lock, flags);
|
||||
scm_initiate_cluster_request(scmrq);
|
||||
spin_unlock_irqrestore(&bdev->rq_lock, flags);
|
||||
break;
|
||||
case CLUSTER_WRITE:
|
||||
scm_request_finish(scmrq);
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
bool scm_cluster_size_valid(void)
|
||||
{
|
||||
if (write_cluster_size == 1 || write_cluster_size > 128)
|
||||
return false;
|
||||
|
||||
return !(write_cluster_size & (write_cluster_size - 1));
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user