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![Vasily Gorbik](/assets/img/avatar_default.png)
The numa_node field of the tag_set struct has to be explicitly initialized, otherwise it stays as 0, which is a valid numa node id and cause memory allocation failure if node 0 is offline. Acked-by: Sebastian Ott <sebott@linux.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
591 lines
14 KiB
C
591 lines
14 KiB
C
// SPDX-License-Identifier: GPL-2.0
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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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#define KMSG_COMPONENT "scm_block"
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#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
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#include <linux/interrupt.h>
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#include <linux/spinlock.h>
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#include <linux/mempool.h>
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#include <linux/module.h>
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#include <linux/blkdev.h>
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#include <linux/blk-mq.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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debug_info_t *scm_debug;
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static int scm_major;
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static mempool_t *aidaw_pool;
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static DEFINE_SPINLOCK(list_lock);
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static LIST_HEAD(inactive_requests);
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static unsigned int nr_requests = 64;
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static unsigned int nr_requests_per_io = 8;
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static atomic_t nr_devices = ATOMIC_INIT(0);
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module_param(nr_requests, uint, S_IRUGO);
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MODULE_PARM_DESC(nr_requests, "Number of parallel requests.");
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module_param(nr_requests_per_io, uint, S_IRUGO);
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MODULE_PARM_DESC(nr_requests_per_io, "Number of requests per IO.");
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MODULE_DESCRIPTION("Block driver for s390 storage class memory.");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("scm:scmdev*");
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static void __scm_free_rq(struct scm_request *scmrq)
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{
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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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kfree(scmrq->request);
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kfree(aobrq);
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}
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static void scm_free_rqs(void)
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{
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struct list_head *iter, *safe;
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struct scm_request *scmrq;
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spin_lock_irq(&list_lock);
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list_for_each_safe(iter, safe, &inactive_requests) {
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scmrq = list_entry(iter, struct scm_request, list);
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list_del(&scmrq->list);
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__scm_free_rq(scmrq);
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}
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spin_unlock_irq(&list_lock);
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mempool_destroy(aidaw_pool);
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}
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static int __scm_alloc_rq(void)
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{
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struct aob_rq_header *aobrq;
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struct scm_request *scmrq;
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aobrq = kzalloc(sizeof(*aobrq) + sizeof(*scmrq), GFP_KERNEL);
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if (!aobrq)
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return -ENOMEM;
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scmrq = (void *) aobrq->data;
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scmrq->aob = (void *) get_zeroed_page(GFP_DMA);
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if (!scmrq->aob)
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goto free;
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scmrq->request = kcalloc(nr_requests_per_io, sizeof(scmrq->request[0]),
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GFP_KERNEL);
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if (!scmrq->request)
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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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spin_unlock_irq(&list_lock);
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return 0;
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free:
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__scm_free_rq(scmrq);
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return -ENOMEM;
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}
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static int scm_alloc_rqs(unsigned int nrqs)
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{
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int ret = 0;
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aidaw_pool = mempool_create_page_pool(max(nrqs/8, 1U), 0);
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if (!aidaw_pool)
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return -ENOMEM;
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while (nrqs-- && !ret)
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ret = __scm_alloc_rq();
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return ret;
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}
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static struct scm_request *scm_request_fetch(void)
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{
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struct scm_request *scmrq = NULL;
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spin_lock_irq(&list_lock);
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if (list_empty(&inactive_requests))
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goto out;
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scmrq = list_first_entry(&inactive_requests, struct scm_request, list);
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list_del(&scmrq->list);
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out:
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spin_unlock_irq(&list_lock);
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return scmrq;
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}
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static void scm_request_done(struct scm_request *scmrq)
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{
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unsigned long flags;
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struct msb *msb;
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u64 aidaw;
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int i;
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for (i = 0; i < nr_requests_per_io && scmrq->request[i]; i++) {
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msb = &scmrq->aob->msb[i];
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aidaw = msb->data_addr;
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if ((msb->flags & MSB_FLAG_IDA) && aidaw &&
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IS_ALIGNED(aidaw, PAGE_SIZE))
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mempool_free(virt_to_page(aidaw), aidaw_pool);
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}
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spin_lock_irqsave(&list_lock, flags);
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list_add(&scmrq->list, &inactive_requests);
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spin_unlock_irqrestore(&list_lock, flags);
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}
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static bool scm_permit_request(struct scm_blk_dev *bdev, struct request *req)
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{
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return rq_data_dir(req) != WRITE || bdev->state != SCM_WR_PROHIBIT;
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}
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static inline struct aidaw *scm_aidaw_alloc(void)
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{
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struct page *page = mempool_alloc(aidaw_pool, GFP_ATOMIC);
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return page ? page_address(page) : NULL;
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}
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static inline unsigned long scm_aidaw_bytes(struct aidaw *aidaw)
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{
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unsigned long _aidaw = (unsigned long) aidaw;
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unsigned long bytes = ALIGN(_aidaw, PAGE_SIZE) - _aidaw;
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return (bytes / sizeof(*aidaw)) * PAGE_SIZE;
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}
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struct aidaw *scm_aidaw_fetch(struct scm_request *scmrq, unsigned int bytes)
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{
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struct aidaw *aidaw;
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if (scm_aidaw_bytes(scmrq->next_aidaw) >= bytes)
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return scmrq->next_aidaw;
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aidaw = scm_aidaw_alloc();
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if (aidaw)
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memset(aidaw, 0, PAGE_SIZE);
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return aidaw;
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}
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static int scm_request_prepare(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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int pos = scmrq->aob->request.msb_count;
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struct msb *msb = &scmrq->aob->msb[pos];
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struct request *req = scmrq->request[pos];
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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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aidaw = scm_aidaw_fetch(scmrq, blk_rq_bytes(req));
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if (!aidaw)
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return -ENOMEM;
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msb->bs = MSB_BS_4K;
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scmrq->aob->request.msb_count++;
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msb->scm_addr = scmdev->address + ((u64) blk_rq_pos(req) << 9);
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msb->oc = (rq_data_dir(req) == READ) ? MSB_OC_READ : MSB_OC_WRITE;
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msb->flags |= MSB_FLAG_IDA;
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msb->data_addr = (u64) aidaw;
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rq_for_each_segment(bv, req, iter) {
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WARN_ON(bv.bv_offset);
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msb->blk_count += bv.bv_len >> 12;
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aidaw->data_addr = (u64) page_address(bv.bv_page);
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aidaw++;
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}
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scmrq->next_aidaw = aidaw;
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return 0;
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}
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static inline void scm_request_set(struct scm_request *scmrq,
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struct request *req)
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{
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scmrq->request[scmrq->aob->request.msb_count] = req;
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}
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static inline void scm_request_init(struct scm_blk_dev *bdev,
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struct scm_request *scmrq)
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{
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struct aob_rq_header *aobrq = to_aobrq(scmrq);
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struct aob *aob = scmrq->aob;
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memset(scmrq->request, 0,
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nr_requests_per_io * sizeof(scmrq->request[0]));
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memset(aob, 0, sizeof(*aob));
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aobrq->scmdev = bdev->scmdev;
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aob->request.cmd_code = ARQB_CMD_MOVE;
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aob->request.data = (u64) aobrq;
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scmrq->bdev = bdev;
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scmrq->retries = 4;
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scmrq->error = BLK_STS_OK;
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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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}
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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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for (i = 0; i < nr_requests_per_io && scmrq->request[i]; i++)
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blk_mq_requeue_request(scmrq->request[i], false);
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atomic_dec(&bdev->queued_reqs);
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scm_request_done(scmrq);
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blk_mq_kick_requeue_list(bdev->rq);
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}
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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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blk_status_t *error;
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int i;
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for (i = 0; i < nr_requests_per_io && scmrq->request[i]; i++) {
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error = blk_mq_rq_to_pdu(scmrq->request[i]);
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*error = scmrq->error;
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blk_mq_complete_request(scmrq->request[i]);
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}
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atomic_dec(&bdev->queued_reqs);
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scm_request_done(scmrq);
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}
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static void scm_request_start(struct scm_request *scmrq)
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{
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struct scm_blk_dev *bdev = scmrq->bdev;
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atomic_inc(&bdev->queued_reqs);
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if (eadm_start_aob(scmrq->aob)) {
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SCM_LOG(5, "no subchannel");
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scm_request_requeue(scmrq);
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}
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}
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struct scm_queue {
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struct scm_request *scmrq;
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spinlock_t lock;
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};
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static blk_status_t scm_blk_request(struct blk_mq_hw_ctx *hctx,
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const struct blk_mq_queue_data *qd)
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{
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struct scm_device *scmdev = hctx->queue->queuedata;
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struct scm_blk_dev *bdev = dev_get_drvdata(&scmdev->dev);
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struct scm_queue *sq = hctx->driver_data;
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struct request *req = qd->rq;
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struct scm_request *scmrq;
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spin_lock(&sq->lock);
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if (!scm_permit_request(bdev, req)) {
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spin_unlock(&sq->lock);
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return BLK_STS_RESOURCE;
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}
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scmrq = sq->scmrq;
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if (!scmrq) {
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scmrq = scm_request_fetch();
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if (!scmrq) {
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SCM_LOG(5, "no request");
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spin_unlock(&sq->lock);
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return BLK_STS_RESOURCE;
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}
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scm_request_init(bdev, scmrq);
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sq->scmrq = scmrq;
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}
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scm_request_set(scmrq, req);
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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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if (scmrq->aob->request.msb_count)
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scm_request_start(scmrq);
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sq->scmrq = NULL;
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spin_unlock(&sq->lock);
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return BLK_STS_RESOURCE;
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}
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blk_mq_start_request(req);
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if (qd->last || scmrq->aob->request.msb_count == nr_requests_per_io) {
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scm_request_start(scmrq);
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sq->scmrq = NULL;
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}
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spin_unlock(&sq->lock);
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return BLK_STS_OK;
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}
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static int scm_blk_init_hctx(struct blk_mq_hw_ctx *hctx, void *data,
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unsigned int idx)
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{
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struct scm_queue *qd = kzalloc(sizeof(*qd), GFP_KERNEL);
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if (!qd)
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return -ENOMEM;
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spin_lock_init(&qd->lock);
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hctx->driver_data = qd;
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return 0;
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}
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static void scm_blk_exit_hctx(struct blk_mq_hw_ctx *hctx, unsigned int idx)
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{
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struct scm_queue *qd = hctx->driver_data;
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WARN_ON(qd->scmrq);
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kfree(hctx->driver_data);
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hctx->driver_data = NULL;
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}
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static void __scmrq_log_error(struct scm_request *scmrq)
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{
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struct aob *aob = scmrq->aob;
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if (scmrq->error == BLK_STS_TIMEOUT)
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SCM_LOG(1, "Request timeout");
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else {
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SCM_LOG(1, "Request error");
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SCM_LOG_HEX(1, &aob->response, sizeof(aob->response));
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}
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if (scmrq->retries)
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SCM_LOG(1, "Retry request");
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else
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pr_err("An I/O operation to SCM failed with rc=%d\n",
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scmrq->error);
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}
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static void scm_blk_handle_error(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 (scmrq->error != BLK_STS_IOERR)
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goto restart;
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/* For -EIO the response block is valid. */
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switch (scmrq->aob->response.eqc) {
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case EQC_WR_PROHIBIT:
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spin_lock_irqsave(&bdev->lock, flags);
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if (bdev->state != SCM_WR_PROHIBIT)
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pr_info("%lx: Write access to the SCM increment is suspended\n",
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(unsigned long) bdev->scmdev->address);
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bdev->state = SCM_WR_PROHIBIT;
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spin_unlock_irqrestore(&bdev->lock, flags);
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goto requeue;
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default:
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break;
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}
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restart:
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if (!eadm_start_aob(scmrq->aob))
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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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void scm_blk_irq(struct scm_device *scmdev, void *data, blk_status_t error)
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{
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struct scm_request *scmrq = data;
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scmrq->error = error;
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if (error) {
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__scmrq_log_error(scmrq);
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if (scmrq->retries-- > 0) {
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scm_blk_handle_error(scmrq);
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return;
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}
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}
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scm_request_finish(scmrq);
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}
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static void scm_blk_request_done(struct request *req)
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{
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blk_status_t *error = blk_mq_rq_to_pdu(req);
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blk_mq_end_request(req, *error);
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}
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static const struct block_device_operations scm_blk_devops = {
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.owner = THIS_MODULE,
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};
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static const struct blk_mq_ops scm_mq_ops = {
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.queue_rq = scm_blk_request,
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.complete = scm_blk_request_done,
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.init_hctx = scm_blk_init_hctx,
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.exit_hctx = scm_blk_exit_hctx,
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};
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int scm_blk_dev_setup(struct scm_blk_dev *bdev, struct scm_device *scmdev)
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{
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unsigned int devindex, nr_max_blk;
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struct request_queue *rq;
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int len, ret;
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devindex = atomic_inc_return(&nr_devices) - 1;
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/* scma..scmz + scmaa..scmzz */
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if (devindex > 701) {
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ret = -ENODEV;
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goto out;
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}
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bdev->scmdev = scmdev;
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bdev->state = SCM_OPER;
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spin_lock_init(&bdev->lock);
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atomic_set(&bdev->queued_reqs, 0);
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bdev->tag_set.ops = &scm_mq_ops;
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bdev->tag_set.cmd_size = sizeof(blk_status_t);
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bdev->tag_set.nr_hw_queues = nr_requests;
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bdev->tag_set.queue_depth = nr_requests_per_io * nr_requests;
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bdev->tag_set.flags = BLK_MQ_F_SHOULD_MERGE;
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bdev->tag_set.numa_node = NUMA_NO_NODE;
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ret = blk_mq_alloc_tag_set(&bdev->tag_set);
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if (ret)
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goto out;
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rq = blk_mq_init_queue(&bdev->tag_set);
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if (IS_ERR(rq)) {
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ret = PTR_ERR(rq);
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goto out_tag;
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}
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bdev->rq = rq;
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nr_max_blk = min(scmdev->nr_max_block,
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(unsigned int) (PAGE_SIZE / sizeof(struct aidaw)));
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blk_queue_logical_block_size(rq, 1 << 12);
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blk_queue_max_hw_sectors(rq, nr_max_blk << 3); /* 8 * 512 = blk_size */
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blk_queue_max_segments(rq, nr_max_blk);
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blk_queue_flag_set(QUEUE_FLAG_NONROT, rq);
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blk_queue_flag_clear(QUEUE_FLAG_ADD_RANDOM, rq);
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bdev->gendisk = alloc_disk(SCM_NR_PARTS);
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if (!bdev->gendisk) {
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ret = -ENOMEM;
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goto out_queue;
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}
|
|
rq->queuedata = scmdev;
|
|
bdev->gendisk->private_data = scmdev;
|
|
bdev->gendisk->fops = &scm_blk_devops;
|
|
bdev->gendisk->queue = rq;
|
|
bdev->gendisk->major = scm_major;
|
|
bdev->gendisk->first_minor = devindex * SCM_NR_PARTS;
|
|
|
|
len = snprintf(bdev->gendisk->disk_name, DISK_NAME_LEN, "scm");
|
|
if (devindex > 25) {
|
|
len += snprintf(bdev->gendisk->disk_name + len,
|
|
DISK_NAME_LEN - len, "%c",
|
|
'a' + (devindex / 26) - 1);
|
|
devindex = devindex % 26;
|
|
}
|
|
snprintf(bdev->gendisk->disk_name + len, DISK_NAME_LEN - len, "%c",
|
|
'a' + devindex);
|
|
|
|
/* 512 byte sectors */
|
|
set_capacity(bdev->gendisk, scmdev->size >> 9);
|
|
device_add_disk(&scmdev->dev, bdev->gendisk);
|
|
return 0;
|
|
|
|
out_queue:
|
|
blk_cleanup_queue(rq);
|
|
out_tag:
|
|
blk_mq_free_tag_set(&bdev->tag_set);
|
|
out:
|
|
atomic_dec(&nr_devices);
|
|
return ret;
|
|
}
|
|
|
|
void scm_blk_dev_cleanup(struct scm_blk_dev *bdev)
|
|
{
|
|
del_gendisk(bdev->gendisk);
|
|
blk_cleanup_queue(bdev->gendisk->queue);
|
|
blk_mq_free_tag_set(&bdev->tag_set);
|
|
put_disk(bdev->gendisk);
|
|
}
|
|
|
|
void scm_blk_set_available(struct scm_blk_dev *bdev)
|
|
{
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&bdev->lock, flags);
|
|
if (bdev->state == SCM_WR_PROHIBIT)
|
|
pr_info("%lx: Write access to the SCM increment is restored\n",
|
|
(unsigned long) bdev->scmdev->address);
|
|
bdev->state = SCM_OPER;
|
|
spin_unlock_irqrestore(&bdev->lock, flags);
|
|
}
|
|
|
|
static bool __init scm_blk_params_valid(void)
|
|
{
|
|
if (!nr_requests_per_io || nr_requests_per_io > 64)
|
|
return false;
|
|
|
|
return true;
|
|
}
|
|
|
|
static int __init scm_blk_init(void)
|
|
{
|
|
int ret = -EINVAL;
|
|
|
|
if (!scm_blk_params_valid())
|
|
goto out;
|
|
|
|
ret = register_blkdev(0, "scm");
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
scm_major = ret;
|
|
ret = scm_alloc_rqs(nr_requests);
|
|
if (ret)
|
|
goto out_free;
|
|
|
|
scm_debug = debug_register("scm_log", 16, 1, 16);
|
|
if (!scm_debug) {
|
|
ret = -ENOMEM;
|
|
goto out_free;
|
|
}
|
|
|
|
debug_register_view(scm_debug, &debug_hex_ascii_view);
|
|
debug_set_level(scm_debug, 2);
|
|
|
|
ret = scm_drv_init();
|
|
if (ret)
|
|
goto out_dbf;
|
|
|
|
return ret;
|
|
|
|
out_dbf:
|
|
debug_unregister(scm_debug);
|
|
out_free:
|
|
scm_free_rqs();
|
|
unregister_blkdev(scm_major, "scm");
|
|
out:
|
|
return ret;
|
|
}
|
|
module_init(scm_blk_init);
|
|
|
|
static void __exit scm_blk_cleanup(void)
|
|
{
|
|
scm_drv_cleanup();
|
|
debug_unregister(scm_debug);
|
|
scm_free_rqs();
|
|
unregister_blkdev(scm_major, "scm");
|
|
}
|
|
module_exit(scm_blk_cleanup);
|