From: Sebastian Ott <sebott@linux.vnet.ibm.com>
Date: Thu, 1 Dec 2016 12:51:32 +0100
Subject: [PATCH] s390/scm: remove cluster option
Git-commit: 94d26bfcf31244d24fddbe7ba5b0dd17f3c32b11
Patch-mainline: v4.13-rc1
References: bsc#1104967,FATE#325924
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>
Acked-by: Hannes Reinecke <hare@suse.com>
---
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 = BLK_STS_OK;
/* 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;
blk_status_t 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 *, blk_status_t);
-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 <sebott@linux.vnet.ibm.com>
- */
-
-#include <linux/spinlock.h>
-#include <linux/module.h>
-#include <linux/blkdev.h>
-#include <linux/genhd.h>
-#include <linux/slab.h>
-#include <linux/list.h>
-#include <asm/eadm.h>
-#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));
-}
--
2.16.4