From 94d26bfcf31244d24fddbe7ba5b0dd17f3c32b11 Mon Sep 17 00:00:00 2001 From: Sebastian Ott Date: Thu, 1 Dec 2016 12:51:32 +0100 Subject: [PATCH] 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 Signed-off-by: Martin Schwidefsky --- drivers/s390/block/Kconfig | 7 - drivers/s390/block/Makefile | 3 - drivers/s390/block/scm_blk.c | 45 +---- drivers/s390/block/scm_blk.h | 54 ------ drivers/s390/block/scm_blk_cluster.c | 255 --------------------------- 5 files changed, 3 insertions(+), 361 deletions(-) delete mode 100644 drivers/s390/block/scm_blk_cluster.c diff --git a/drivers/s390/block/Kconfig b/drivers/s390/block/Kconfig index 0acb8c2f9475..31f014b57bfc 100644 --- a/drivers/s390/block/Kconfig +++ b/drivers/s390/block/Kconfig @@ -82,10 +82,3 @@ config SCM_BLOCK To compile this driver as a module, choose M here: the module will be called scm_block. - -config SCM_BLOCK_CLUSTER_WRITE - def_bool y - prompt "SCM force cluster writes" - depends on SCM_BLOCK - help - Force writes to Storage Class Memory (SCM) to be in done in clusters. diff --git a/drivers/s390/block/Makefile b/drivers/s390/block/Makefile index c2f4e673e031..b64e2b32c753 100644 --- a/drivers/s390/block/Makefile +++ b/drivers/s390/block/Makefile @@ -19,7 +19,4 @@ obj-$(CONFIG_BLK_DEV_XPRAM) += xpram.o obj-$(CONFIG_DCSSBLK) += dcssblk.o scm_block-objs := scm_drv.o scm_blk.o -ifdef CONFIG_SCM_BLOCK_CLUSTER_WRITE -scm_block-objs += scm_blk_cluster.o -endif obj-$(CONFIG_SCM_BLOCK) += scm_block.o diff --git a/drivers/s390/block/scm_blk.c b/drivers/s390/block/scm_blk.c index 152de6817875..97fd0fcfa3e6 100644 --- a/drivers/s390/block/scm_blk.c +++ b/drivers/s390/block/scm_blk.c @@ -42,7 +42,6 @@ static void __scm_free_rq(struct scm_request *scmrq) struct aob_rq_header *aobrq = to_aobrq(scmrq); free_page((unsigned long) scmrq->aob); - __scm_free_rq_cluster(scmrq); kfree(scmrq->request); kfree(aobrq); } @@ -82,9 +81,6 @@ static int __scm_alloc_rq(void) if (!scmrq->request) goto free; - if (__scm_alloc_rq_cluster(scmrq)) - goto free; - INIT_LIST_HEAD(&scmrq->list); spin_lock_irq(&list_lock); list_add(&scmrq->list, &inactive_requests); @@ -234,7 +230,6 @@ static inline void scm_request_init(struct scm_blk_dev *bdev, scmrq->error = 0; /* We don't use all msbs - place aidaws at the end of the aob page. */ scmrq->next_aidaw = (void *) &aob->msb[nr_requests_per_io]; - scm_request_cluster_init(scmrq); } static void scm_ensure_queue_restart(struct scm_blk_dev *bdev) @@ -246,12 +241,11 @@ static void scm_ensure_queue_restart(struct scm_blk_dev *bdev) blk_delay_queue(bdev->rq, SCM_QUEUE_DELAY); } -void scm_request_requeue(struct scm_request *scmrq) +static void scm_request_requeue(struct scm_request *scmrq) { struct scm_blk_dev *bdev = scmrq->bdev; int i; - scm_release_cluster(scmrq); for (i = 0; i < nr_requests_per_io && scmrq->request[i]; i++) blk_requeue_request(bdev->rq, scmrq->request[i]); @@ -260,12 +254,11 @@ void scm_request_requeue(struct scm_request *scmrq) scm_ensure_queue_restart(bdev); } -void scm_request_finish(struct scm_request *scmrq) +static void scm_request_finish(struct scm_request *scmrq) { struct scm_blk_dev *bdev = scmrq->bdev; int i; - scm_release_cluster(scmrq); for (i = 0; i < nr_requests_per_io && scmrq->request[i]; i++) blk_end_request_all(scmrq->request[i], scmrq->error); @@ -313,31 +306,6 @@ static void scm_blk_request(struct request_queue *rq) } scm_request_set(scmrq, req); - if (!scm_reserve_cluster(scmrq)) { - SCM_LOG(5, "cluster busy"); - scm_request_set(scmrq, NULL); - if (scmrq->aob->request.msb_count) - goto out; - - scm_request_done(scmrq); - return; - } - - if (scm_need_cluster_request(scmrq)) { - if (scmrq->aob->request.msb_count) { - /* Start cluster requests separately. */ - scm_request_set(scmrq, NULL); - if (scm_request_start(scmrq)) - return; - } else { - atomic_inc(&bdev->queued_reqs); - blk_start_request(req); - scm_initiate_cluster_request(scmrq); - } - scmrq = NULL; - continue; - } - if (scm_request_prepare(scmrq)) { SCM_LOG(5, "aidaw alloc failed"); scm_request_set(scmrq, NULL); @@ -444,12 +412,6 @@ static void scm_blk_tasklet(struct scm_blk_dev *bdev) continue; } - if (scm_test_cluster_request(scmrq)) { - scm_cluster_request_irq(scmrq); - spin_lock_irqsave(&bdev->lock, flags); - continue; - } - scm_request_finish(scmrq); spin_lock_irqsave(&bdev->lock, flags); } @@ -498,7 +460,6 @@ int scm_blk_dev_setup(struct scm_blk_dev *bdev, struct scm_device *scmdev) blk_queue_max_segments(rq, nr_max_blk); queue_flag_set_unlocked(QUEUE_FLAG_NONROT, rq); queue_flag_clear_unlocked(QUEUE_FLAG_ADD_RANDOM, rq); - scm_blk_dev_cluster_setup(bdev); bdev->gendisk = alloc_disk(SCM_NR_PARTS); if (!bdev->gendisk) @@ -558,7 +519,7 @@ static bool __init scm_blk_params_valid(void) if (!nr_requests_per_io || nr_requests_per_io > 64) return false; - return scm_cluster_size_valid(); + return true; } static int __init scm_blk_init(void) diff --git a/drivers/s390/block/scm_blk.h b/drivers/s390/block/scm_blk.h index 09218cdc5129..f32188dd7909 100644 --- a/drivers/s390/block/scm_blk.h +++ b/drivers/s390/block/scm_blk.h @@ -23,9 +23,6 @@ struct scm_blk_dev { atomic_t queued_reqs; enum {SCM_OPER, SCM_WR_PROHIBIT} state; struct list_head finished_requests; -#ifdef CONFIG_SCM_BLOCK_CLUSTER_WRITE - struct list_head cluster_list; -#endif }; struct scm_request { @@ -36,13 +33,6 @@ struct scm_request { struct list_head list; u8 retries; int error; -#ifdef CONFIG_SCM_BLOCK_CLUSTER_WRITE - struct { - enum {CLUSTER_NONE, CLUSTER_READ, CLUSTER_WRITE} state; - struct list_head list; - void **buf; - } cluster; -#endif }; #define to_aobrq(rq) container_of((void *) rq, struct aob_rq_header, data) @@ -52,55 +42,11 @@ void scm_blk_dev_cleanup(struct scm_blk_dev *); void scm_blk_set_available(struct scm_blk_dev *); void scm_blk_irq(struct scm_device *, void *, int); -void scm_request_finish(struct scm_request *); -void scm_request_requeue(struct scm_request *); - struct aidaw *scm_aidaw_fetch(struct scm_request *scmrq, unsigned int bytes); int scm_drv_init(void); void scm_drv_cleanup(void); -#ifdef CONFIG_SCM_BLOCK_CLUSTER_WRITE -void __scm_free_rq_cluster(struct scm_request *); -int __scm_alloc_rq_cluster(struct scm_request *); -void scm_request_cluster_init(struct scm_request *); -bool scm_reserve_cluster(struct scm_request *); -void scm_release_cluster(struct scm_request *); -void scm_blk_dev_cluster_setup(struct scm_blk_dev *); -bool scm_need_cluster_request(struct scm_request *); -void scm_initiate_cluster_request(struct scm_request *); -void scm_cluster_request_irq(struct scm_request *); -bool scm_test_cluster_request(struct scm_request *); -bool scm_cluster_size_valid(void); -#else /* CONFIG_SCM_BLOCK_CLUSTER_WRITE */ -static inline void __scm_free_rq_cluster(struct scm_request *scmrq) {} -static inline int __scm_alloc_rq_cluster(struct scm_request *scmrq) -{ - return 0; -} -static inline void scm_request_cluster_init(struct scm_request *scmrq) {} -static inline bool scm_reserve_cluster(struct scm_request *scmrq) -{ - return true; -} -static inline void scm_release_cluster(struct scm_request *scmrq) {} -static inline void scm_blk_dev_cluster_setup(struct scm_blk_dev *bdev) {} -static inline bool scm_need_cluster_request(struct scm_request *scmrq) -{ - return false; -} -static inline void scm_initiate_cluster_request(struct scm_request *scmrq) {} -static inline void scm_cluster_request_irq(struct scm_request *scmrq) {} -static inline bool scm_test_cluster_request(struct scm_request *scmrq) -{ - return false; -} -static inline bool scm_cluster_size_valid(void) -{ - return true; -} -#endif /* CONFIG_SCM_BLOCK_CLUSTER_WRITE */ - extern debug_info_t *scm_debug; #define SCM_LOG(imp, txt) do { \ diff --git a/drivers/s390/block/scm_blk_cluster.c b/drivers/s390/block/scm_blk_cluster.c deleted file mode 100644 index 7497ddde2dd6..000000000000 --- a/drivers/s390/block/scm_blk_cluster.c +++ /dev/null @@ -1,255 +0,0 @@ -/* - * Block driver for s390 storage class memory. - * - * Copyright IBM Corp. 2012 - * Author(s): Sebastian Ott - */ - -#include -#include -#include -#include -#include -#include -#include -#include "scm_blk.h" - -static unsigned int write_cluster_size = 64; -module_param(write_cluster_size, uint, S_IRUGO); -MODULE_PARM_DESC(write_cluster_size, - "Number of pages used for contiguous writes."); - -#define CLUSTER_SIZE (write_cluster_size * PAGE_SIZE) - -void __scm_free_rq_cluster(struct scm_request *scmrq) -{ - int i; - - if (!scmrq->cluster.buf) - return; - - for (i = 0; i < 2 * write_cluster_size; i++) - free_page((unsigned long) scmrq->cluster.buf[i]); - - kfree(scmrq->cluster.buf); -} - -int __scm_alloc_rq_cluster(struct scm_request *scmrq) -{ - int i; - - scmrq->cluster.buf = kzalloc(sizeof(void *) * 2 * write_cluster_size, - GFP_KERNEL); - if (!scmrq->cluster.buf) - return -ENOMEM; - - for (i = 0; i < 2 * write_cluster_size; i++) { - scmrq->cluster.buf[i] = (void *) get_zeroed_page(GFP_DMA); - if (!scmrq->cluster.buf[i]) - return -ENOMEM; - } - INIT_LIST_HEAD(&scmrq->cluster.list); - return 0; -} - -void scm_request_cluster_init(struct scm_request *scmrq) -{ - scmrq->cluster.state = CLUSTER_NONE; -} - -static bool clusters_intersect(struct request *A, struct request *B) -{ - unsigned long firstA, lastA, firstB, lastB; - - 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) << 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 (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; - } - } - } - if (add) - list_add(&scmrq->cluster.list, &bdev->cluster_list); - spin_unlock(&bdev->lock); - - return true; -} - -void scm_release_cluster(struct scm_request *scmrq) -{ - struct scm_blk_dev *bdev = scmrq->bdev; - unsigned long flags; - - if (write_cluster_size == 0) - return; - - spin_lock_irqsave(&bdev->lock, flags); - list_del(&scmrq->cluster.list); - spin_unlock_irqrestore(&bdev->lock, flags); -} - -void scm_blk_dev_cluster_setup(struct scm_blk_dev *bdev) -{ - INIT_LIST_HEAD(&bdev->cluster_list); - blk_queue_io_opt(bdev->rq, CLUSTER_SIZE); -} - -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[0]; - struct msb *msb = &scmrq->aob->msb[0]; - struct req_iterator iter; - struct aidaw *aidaw; - struct bio_vec bv; - int i = 0; - u64 addr; - - switch (scmrq->cluster.state) { - case CLUSTER_NONE: - scmrq->cluster.state = CLUSTER_READ; - /* fall through */ - case CLUSTER_READ: - msb->bs = MSB_BS_4K; - msb->oc = MSB_OC_READ; - msb->flags = MSB_FLAG_IDA; - msb->blk_count = write_cluster_size; - - addr = scmdev->address + ((u64) blk_rq_pos(req) << 9); - msb->scm_addr = round_down(addr, CLUSTER_SIZE); - - if (msb->scm_addr != - round_down(addr + (u64) blk_rq_bytes(req) - 1, - 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++; - } - - break; - case CLUSTER_WRITE: - aidaw = (void *) msb->data_addr; - msb->oc = MSB_OC_WRITE; - - for (addr = msb->scm_addr; - addr < scmdev->address + ((u64) blk_rq_pos(req) << 9); - addr += PAGE_SIZE) { - aidaw->data_addr = (u64) scmrq->cluster.buf[i]; - aidaw++; - i++; - } - rq_for_each_segment(bv, req, iter) { - aidaw->data_addr = (u64) page_address(bv.bv_page); - aidaw++; - i++; - } - for (; i < msb->blk_count; i++) { - aidaw->data_addr = (u64) scmrq->cluster.buf[i]; - aidaw++; - } - break; - } - return 0; -} - -bool scm_need_cluster_request(struct scm_request *scmrq) -{ - int pos = scmrq->aob->request.msb_count; - - if (rq_data_dir(scmrq->request[pos]) == READ) - return false; - - return blk_rq_bytes(scmrq->request[pos]) < CLUSTER_SIZE; -} - -/* Called with queue lock held. */ -void scm_initiate_cluster_request(struct scm_request *scmrq) -{ - if (scm_prepare_cluster_request(scmrq)) - goto requeue; - if (eadm_start_aob(scmrq->aob)) - goto requeue; - return; -requeue: - scm_request_requeue(scmrq); -} - -bool scm_test_cluster_request(struct scm_request *scmrq) -{ - 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)); -}