mirror of https://gitee.com/openkylin/linux.git
657 lines
17 KiB
C
657 lines
17 KiB
C
/*
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* Persistent Memory Driver
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*
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* Copyright (c) 2014-2015, Intel Corporation.
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* Copyright (c) 2015, Christoph Hellwig <hch@lst.de>.
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* Copyright (c) 2015, Boaz Harrosh <boaz@plexistor.com>.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*/
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#include <asm/cacheflush.h>
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#include <linux/blkdev.h>
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#include <linux/hdreg.h>
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#include <linux/init.h>
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#include <linux/platform_device.h>
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/badblocks.h>
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#include <linux/memremap.h>
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#include <linux/vmalloc.h>
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#include <linux/pfn_t.h>
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#include <linux/slab.h>
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#include <linux/pmem.h>
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#include <linux/nd.h>
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#include "pfn.h"
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#include "nd.h"
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struct pmem_device {
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struct request_queue *pmem_queue;
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struct gendisk *pmem_disk;
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struct nd_namespace_common *ndns;
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/* One contiguous memory region per device */
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phys_addr_t phys_addr;
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/* when non-zero this device is hosting a 'pfn' instance */
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phys_addr_t data_offset;
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u64 pfn_flags;
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void __pmem *virt_addr;
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/* immutable base size of the namespace */
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size_t size;
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/* trim size when namespace capacity has been section aligned */
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u32 pfn_pad;
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struct badblocks bb;
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};
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static bool is_bad_pmem(struct badblocks *bb, sector_t sector, unsigned int len)
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{
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if (bb->count) {
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sector_t first_bad;
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int num_bad;
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return !!badblocks_check(bb, sector, len / 512, &first_bad,
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&num_bad);
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}
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return false;
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}
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static void pmem_clear_poison(struct pmem_device *pmem, phys_addr_t offset,
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unsigned int len)
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{
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struct device *dev = disk_to_dev(pmem->pmem_disk);
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sector_t sector;
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long cleared;
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sector = (offset - pmem->data_offset) / 512;
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cleared = nvdimm_clear_poison(dev, pmem->phys_addr + offset, len);
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if (cleared > 0 && cleared / 512) {
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dev_dbg(dev, "%s: %llx clear %ld sector%s\n",
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__func__, (unsigned long long) sector,
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cleared / 512, cleared / 512 > 1 ? "s" : "");
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badblocks_clear(&pmem->bb, sector, cleared / 512);
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}
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invalidate_pmem(pmem->virt_addr + offset, len);
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}
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static int pmem_do_bvec(struct pmem_device *pmem, struct page *page,
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unsigned int len, unsigned int off, int rw,
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sector_t sector)
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{
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int rc = 0;
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bool bad_pmem = false;
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void *mem = kmap_atomic(page);
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phys_addr_t pmem_off = sector * 512 + pmem->data_offset;
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void __pmem *pmem_addr = pmem->virt_addr + pmem_off;
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if (unlikely(is_bad_pmem(&pmem->bb, sector, len)))
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bad_pmem = true;
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if (rw == READ) {
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if (unlikely(bad_pmem))
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rc = -EIO;
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else {
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rc = memcpy_from_pmem(mem + off, pmem_addr, len);
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flush_dcache_page(page);
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}
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} else {
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flush_dcache_page(page);
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memcpy_to_pmem(pmem_addr, mem + off, len);
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if (unlikely(bad_pmem)) {
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pmem_clear_poison(pmem, pmem_off, len);
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memcpy_to_pmem(pmem_addr, mem + off, len);
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}
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}
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kunmap_atomic(mem);
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return rc;
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}
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static blk_qc_t pmem_make_request(struct request_queue *q, struct bio *bio)
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{
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int rc = 0;
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bool do_acct;
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unsigned long start;
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struct bio_vec bvec;
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struct bvec_iter iter;
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struct block_device *bdev = bio->bi_bdev;
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struct pmem_device *pmem = bdev->bd_disk->private_data;
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do_acct = nd_iostat_start(bio, &start);
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bio_for_each_segment(bvec, bio, iter) {
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rc = pmem_do_bvec(pmem, bvec.bv_page, bvec.bv_len,
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bvec.bv_offset, bio_data_dir(bio),
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iter.bi_sector);
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if (rc) {
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bio->bi_error = rc;
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break;
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}
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}
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if (do_acct)
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nd_iostat_end(bio, start);
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if (bio_data_dir(bio))
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wmb_pmem();
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bio_endio(bio);
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return BLK_QC_T_NONE;
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}
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static int pmem_rw_page(struct block_device *bdev, sector_t sector,
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struct page *page, int rw)
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{
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struct pmem_device *pmem = bdev->bd_disk->private_data;
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int rc;
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rc = pmem_do_bvec(pmem, page, PAGE_SIZE, 0, rw, sector);
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if (rw & WRITE)
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wmb_pmem();
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/*
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* The ->rw_page interface is subtle and tricky. The core
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* retries on any error, so we can only invoke page_endio() in
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* the successful completion case. Otherwise, we'll see crashes
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* caused by double completion.
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*/
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if (rc == 0)
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page_endio(page, rw & WRITE, 0);
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return rc;
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}
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static long pmem_direct_access(struct block_device *bdev, sector_t sector,
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void __pmem **kaddr, pfn_t *pfn)
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{
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struct pmem_device *pmem = bdev->bd_disk->private_data;
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resource_size_t offset = sector * 512 + pmem->data_offset;
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*kaddr = pmem->virt_addr + offset;
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*pfn = phys_to_pfn_t(pmem->phys_addr + offset, pmem->pfn_flags);
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return pmem->size - pmem->pfn_pad - offset;
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}
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static const struct block_device_operations pmem_fops = {
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.owner = THIS_MODULE,
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.rw_page = pmem_rw_page,
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.direct_access = pmem_direct_access,
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.revalidate_disk = nvdimm_revalidate_disk,
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};
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static struct pmem_device *pmem_alloc(struct device *dev,
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struct resource *res, int id)
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{
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struct pmem_device *pmem;
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struct request_queue *q;
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pmem = devm_kzalloc(dev, sizeof(*pmem), GFP_KERNEL);
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if (!pmem)
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return ERR_PTR(-ENOMEM);
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pmem->phys_addr = res->start;
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pmem->size = resource_size(res);
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if (!arch_has_wmb_pmem())
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dev_warn(dev, "unable to guarantee persistence of writes\n");
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if (!devm_request_mem_region(dev, pmem->phys_addr, pmem->size,
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dev_name(dev))) {
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dev_warn(dev, "could not reserve region [0x%pa:0x%zx]\n",
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&pmem->phys_addr, pmem->size);
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return ERR_PTR(-EBUSY);
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}
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q = blk_alloc_queue_node(GFP_KERNEL, dev_to_node(dev));
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if (!q)
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return ERR_PTR(-ENOMEM);
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pmem->pfn_flags = PFN_DEV;
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if (pmem_should_map_pages(dev)) {
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pmem->virt_addr = (void __pmem *) devm_memremap_pages(dev, res,
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&q->q_usage_counter, NULL);
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pmem->pfn_flags |= PFN_MAP;
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} else
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pmem->virt_addr = (void __pmem *) devm_memremap(dev,
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pmem->phys_addr, pmem->size,
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ARCH_MEMREMAP_PMEM);
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if (IS_ERR(pmem->virt_addr)) {
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blk_cleanup_queue(q);
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return (void __force *) pmem->virt_addr;
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}
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pmem->pmem_queue = q;
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return pmem;
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}
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static void pmem_detach_disk(struct pmem_device *pmem)
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{
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if (!pmem->pmem_disk)
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return;
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del_gendisk(pmem->pmem_disk);
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put_disk(pmem->pmem_disk);
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blk_cleanup_queue(pmem->pmem_queue);
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}
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static int pmem_attach_disk(struct device *dev,
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struct nd_namespace_common *ndns, struct pmem_device *pmem)
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{
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struct nd_namespace_io *nsio = to_nd_namespace_io(&ndns->dev);
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int nid = dev_to_node(dev);
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struct resource bb_res;
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struct gendisk *disk;
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blk_queue_make_request(pmem->pmem_queue, pmem_make_request);
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blk_queue_physical_block_size(pmem->pmem_queue, PAGE_SIZE);
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blk_queue_max_hw_sectors(pmem->pmem_queue, UINT_MAX);
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blk_queue_bounce_limit(pmem->pmem_queue, BLK_BOUNCE_ANY);
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queue_flag_set_unlocked(QUEUE_FLAG_NONROT, pmem->pmem_queue);
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disk = alloc_disk_node(0, nid);
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if (!disk) {
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blk_cleanup_queue(pmem->pmem_queue);
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return -ENOMEM;
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}
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disk->fops = &pmem_fops;
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disk->private_data = pmem;
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disk->queue = pmem->pmem_queue;
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disk->flags = GENHD_FL_EXT_DEVT;
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nvdimm_namespace_disk_name(ndns, disk->disk_name);
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disk->driverfs_dev = dev;
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set_capacity(disk, (pmem->size - pmem->pfn_pad - pmem->data_offset)
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/ 512);
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pmem->pmem_disk = disk;
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devm_exit_badblocks(dev, &pmem->bb);
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if (devm_init_badblocks(dev, &pmem->bb))
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return -ENOMEM;
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bb_res.start = nsio->res.start + pmem->data_offset;
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bb_res.end = nsio->res.end;
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if (is_nd_pfn(dev)) {
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struct nd_pfn *nd_pfn = to_nd_pfn(dev);
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struct nd_pfn_sb *pfn_sb = nd_pfn->pfn_sb;
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bb_res.start += __le32_to_cpu(pfn_sb->start_pad);
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bb_res.end -= __le32_to_cpu(pfn_sb->end_trunc);
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}
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nvdimm_badblocks_populate(to_nd_region(dev->parent), &pmem->bb,
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&bb_res);
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disk->bb = &pmem->bb;
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add_disk(disk);
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revalidate_disk(disk);
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return 0;
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}
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static int pmem_rw_bytes(struct nd_namespace_common *ndns,
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resource_size_t offset, void *buf, size_t size, int rw)
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{
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struct pmem_device *pmem = dev_get_drvdata(ndns->claim);
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if (unlikely(offset + size > pmem->size)) {
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dev_WARN_ONCE(&ndns->dev, 1, "request out of range\n");
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return -EFAULT;
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}
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if (rw == READ) {
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unsigned int sz_align = ALIGN(size + (offset & (512 - 1)), 512);
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if (unlikely(is_bad_pmem(&pmem->bb, offset / 512, sz_align)))
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return -EIO;
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return memcpy_from_pmem(buf, pmem->virt_addr + offset, size);
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} else {
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memcpy_to_pmem(pmem->virt_addr + offset, buf, size);
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wmb_pmem();
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}
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return 0;
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}
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static int nd_pfn_init(struct nd_pfn *nd_pfn)
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{
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struct nd_pfn_sb *pfn_sb = kzalloc(sizeof(*pfn_sb), GFP_KERNEL);
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struct pmem_device *pmem = dev_get_drvdata(&nd_pfn->dev);
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struct nd_namespace_common *ndns = nd_pfn->ndns;
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u32 start_pad = 0, end_trunc = 0;
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resource_size_t start, size;
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struct nd_namespace_io *nsio;
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struct nd_region *nd_region;
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unsigned long npfns;
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phys_addr_t offset;
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u64 checksum;
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int rc;
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if (!pfn_sb)
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return -ENOMEM;
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nd_pfn->pfn_sb = pfn_sb;
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rc = nd_pfn_validate(nd_pfn);
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if (rc == -ENODEV)
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/* no info block, do init */;
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else
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return rc;
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nd_region = to_nd_region(nd_pfn->dev.parent);
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if (nd_region->ro) {
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dev_info(&nd_pfn->dev,
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"%s is read-only, unable to init metadata\n",
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dev_name(&nd_region->dev));
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goto err;
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}
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memset(pfn_sb, 0, sizeof(*pfn_sb));
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/*
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* Check if pmem collides with 'System RAM' when section aligned and
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* trim it accordingly
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*/
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nsio = to_nd_namespace_io(&ndns->dev);
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start = PHYS_SECTION_ALIGN_DOWN(nsio->res.start);
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size = resource_size(&nsio->res);
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if (region_intersects(start, size, IORESOURCE_SYSTEM_RAM,
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IORES_DESC_NONE) == REGION_MIXED) {
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start = nsio->res.start;
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start_pad = PHYS_SECTION_ALIGN_UP(start) - start;
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}
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start = nsio->res.start;
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size = PHYS_SECTION_ALIGN_UP(start + size) - start;
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if (region_intersects(start, size, IORESOURCE_SYSTEM_RAM,
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IORES_DESC_NONE) == REGION_MIXED) {
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size = resource_size(&nsio->res);
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end_trunc = start + size - PHYS_SECTION_ALIGN_DOWN(start + size);
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}
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if (start_pad + end_trunc)
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dev_info(&nd_pfn->dev, "%s section collision, truncate %d bytes\n",
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dev_name(&ndns->dev), start_pad + end_trunc);
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/*
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* Note, we use 64 here for the standard size of struct page,
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* debugging options may cause it to be larger in which case the
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* implementation will limit the pfns advertised through
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* ->direct_access() to those that are included in the memmap.
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*/
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start += start_pad;
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npfns = (pmem->size - start_pad - end_trunc - SZ_8K) / SZ_4K;
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if (nd_pfn->mode == PFN_MODE_PMEM)
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offset = ALIGN(start + SZ_8K + 64 * npfns, nd_pfn->align)
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- start;
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else if (nd_pfn->mode == PFN_MODE_RAM)
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offset = ALIGN(start + SZ_8K, nd_pfn->align) - start;
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else
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goto err;
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if (offset + start_pad + end_trunc >= pmem->size) {
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dev_err(&nd_pfn->dev, "%s unable to satisfy requested alignment\n",
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dev_name(&ndns->dev));
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goto err;
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}
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npfns = (pmem->size - offset - start_pad - end_trunc) / SZ_4K;
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pfn_sb->mode = cpu_to_le32(nd_pfn->mode);
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pfn_sb->dataoff = cpu_to_le64(offset);
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pfn_sb->npfns = cpu_to_le64(npfns);
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memcpy(pfn_sb->signature, PFN_SIG, PFN_SIG_LEN);
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memcpy(pfn_sb->uuid, nd_pfn->uuid, 16);
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memcpy(pfn_sb->parent_uuid, nd_dev_to_uuid(&ndns->dev), 16);
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pfn_sb->version_major = cpu_to_le16(1);
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pfn_sb->version_minor = cpu_to_le16(1);
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pfn_sb->start_pad = cpu_to_le32(start_pad);
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pfn_sb->end_trunc = cpu_to_le32(end_trunc);
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checksum = nd_sb_checksum((struct nd_gen_sb *) pfn_sb);
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pfn_sb->checksum = cpu_to_le64(checksum);
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rc = nvdimm_write_bytes(ndns, SZ_4K, pfn_sb, sizeof(*pfn_sb));
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if (rc)
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goto err;
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return 0;
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err:
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nd_pfn->pfn_sb = NULL;
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kfree(pfn_sb);
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return -ENXIO;
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}
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static int nvdimm_namespace_detach_pfn(struct nd_namespace_common *ndns)
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{
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struct nd_pfn *nd_pfn = to_nd_pfn(ndns->claim);
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struct pmem_device *pmem;
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/* free pmem disk */
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pmem = dev_get_drvdata(&nd_pfn->dev);
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pmem_detach_disk(pmem);
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/* release nd_pfn resources */
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kfree(nd_pfn->pfn_sb);
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nd_pfn->pfn_sb = NULL;
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return 0;
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}
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/*
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* We hotplug memory at section granularity, pad the reserved area from
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* the previous section base to the namespace base address.
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*/
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static unsigned long init_altmap_base(resource_size_t base)
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{
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unsigned long base_pfn = PHYS_PFN(base);
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return PFN_SECTION_ALIGN_DOWN(base_pfn);
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}
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static unsigned long init_altmap_reserve(resource_size_t base)
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{
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unsigned long reserve = PHYS_PFN(SZ_8K);
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unsigned long base_pfn = PHYS_PFN(base);
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reserve += base_pfn - PFN_SECTION_ALIGN_DOWN(base_pfn);
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return reserve;
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}
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static int __nvdimm_namespace_attach_pfn(struct nd_pfn *nd_pfn)
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{
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int rc;
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struct resource res;
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struct request_queue *q;
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struct pmem_device *pmem;
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struct vmem_altmap *altmap;
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struct device *dev = &nd_pfn->dev;
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struct nd_pfn_sb *pfn_sb = nd_pfn->pfn_sb;
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struct nd_namespace_common *ndns = nd_pfn->ndns;
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u32 start_pad = __le32_to_cpu(pfn_sb->start_pad);
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u32 end_trunc = __le32_to_cpu(pfn_sb->end_trunc);
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|
struct nd_namespace_io *nsio = to_nd_namespace_io(&ndns->dev);
|
|
resource_size_t base = nsio->res.start + start_pad;
|
|
struct vmem_altmap __altmap = {
|
|
.base_pfn = init_altmap_base(base),
|
|
.reserve = init_altmap_reserve(base),
|
|
};
|
|
|
|
pmem = dev_get_drvdata(dev);
|
|
pmem->data_offset = le64_to_cpu(pfn_sb->dataoff);
|
|
pmem->pfn_pad = start_pad + end_trunc;
|
|
nd_pfn->mode = le32_to_cpu(nd_pfn->pfn_sb->mode);
|
|
if (nd_pfn->mode == PFN_MODE_RAM) {
|
|
if (pmem->data_offset < SZ_8K)
|
|
return -EINVAL;
|
|
nd_pfn->npfns = le64_to_cpu(pfn_sb->npfns);
|
|
altmap = NULL;
|
|
} else if (nd_pfn->mode == PFN_MODE_PMEM) {
|
|
nd_pfn->npfns = (pmem->size - pmem->pfn_pad - pmem->data_offset)
|
|
/ PAGE_SIZE;
|
|
if (le64_to_cpu(nd_pfn->pfn_sb->npfns) > nd_pfn->npfns)
|
|
dev_info(&nd_pfn->dev,
|
|
"number of pfns truncated from %lld to %ld\n",
|
|
le64_to_cpu(nd_pfn->pfn_sb->npfns),
|
|
nd_pfn->npfns);
|
|
altmap = & __altmap;
|
|
altmap->free = PHYS_PFN(pmem->data_offset - SZ_8K);
|
|
altmap->alloc = 0;
|
|
} else {
|
|
rc = -ENXIO;
|
|
goto err;
|
|
}
|
|
|
|
/* establish pfn range for lookup, and switch to direct map */
|
|
q = pmem->pmem_queue;
|
|
memcpy(&res, &nsio->res, sizeof(res));
|
|
res.start += start_pad;
|
|
res.end -= end_trunc;
|
|
devm_memunmap(dev, (void __force *) pmem->virt_addr);
|
|
pmem->virt_addr = (void __pmem *) devm_memremap_pages(dev, &res,
|
|
&q->q_usage_counter, altmap);
|
|
pmem->pfn_flags |= PFN_MAP;
|
|
if (IS_ERR(pmem->virt_addr)) {
|
|
rc = PTR_ERR(pmem->virt_addr);
|
|
goto err;
|
|
}
|
|
|
|
/* attach pmem disk in "pfn-mode" */
|
|
rc = pmem_attach_disk(dev, ndns, pmem);
|
|
if (rc)
|
|
goto err;
|
|
|
|
return rc;
|
|
err:
|
|
nvdimm_namespace_detach_pfn(ndns);
|
|
return rc;
|
|
|
|
}
|
|
|
|
static int nvdimm_namespace_attach_pfn(struct nd_namespace_common *ndns)
|
|
{
|
|
struct nd_pfn *nd_pfn = to_nd_pfn(ndns->claim);
|
|
int rc;
|
|
|
|
if (!nd_pfn->uuid || !nd_pfn->ndns)
|
|
return -ENODEV;
|
|
|
|
rc = nd_pfn_init(nd_pfn);
|
|
if (rc)
|
|
return rc;
|
|
/* we need a valid pfn_sb before we can init a vmem_altmap */
|
|
return __nvdimm_namespace_attach_pfn(nd_pfn);
|
|
}
|
|
|
|
static int nd_pmem_probe(struct device *dev)
|
|
{
|
|
struct nd_region *nd_region = to_nd_region(dev->parent);
|
|
struct nd_namespace_common *ndns;
|
|
struct nd_namespace_io *nsio;
|
|
struct pmem_device *pmem;
|
|
|
|
ndns = nvdimm_namespace_common_probe(dev);
|
|
if (IS_ERR(ndns))
|
|
return PTR_ERR(ndns);
|
|
|
|
nsio = to_nd_namespace_io(&ndns->dev);
|
|
pmem = pmem_alloc(dev, &nsio->res, nd_region->id);
|
|
if (IS_ERR(pmem))
|
|
return PTR_ERR(pmem);
|
|
|
|
pmem->ndns = ndns;
|
|
dev_set_drvdata(dev, pmem);
|
|
ndns->rw_bytes = pmem_rw_bytes;
|
|
if (devm_init_badblocks(dev, &pmem->bb))
|
|
return -ENOMEM;
|
|
nvdimm_badblocks_populate(nd_region, &pmem->bb, &nsio->res);
|
|
|
|
if (is_nd_btt(dev)) {
|
|
/* btt allocates its own request_queue */
|
|
blk_cleanup_queue(pmem->pmem_queue);
|
|
pmem->pmem_queue = NULL;
|
|
return nvdimm_namespace_attach_btt(ndns);
|
|
}
|
|
|
|
if (is_nd_pfn(dev))
|
|
return nvdimm_namespace_attach_pfn(ndns);
|
|
|
|
if (nd_btt_probe(ndns, pmem) == 0 || nd_pfn_probe(ndns, pmem) == 0) {
|
|
/*
|
|
* We'll come back as either btt-pmem, or pfn-pmem, so
|
|
* drop the queue allocation for now.
|
|
*/
|
|
blk_cleanup_queue(pmem->pmem_queue);
|
|
return -ENXIO;
|
|
}
|
|
|
|
return pmem_attach_disk(dev, ndns, pmem);
|
|
}
|
|
|
|
static int nd_pmem_remove(struct device *dev)
|
|
{
|
|
struct pmem_device *pmem = dev_get_drvdata(dev);
|
|
|
|
if (is_nd_btt(dev))
|
|
nvdimm_namespace_detach_btt(pmem->ndns);
|
|
else if (is_nd_pfn(dev))
|
|
nvdimm_namespace_detach_pfn(pmem->ndns);
|
|
else
|
|
pmem_detach_disk(pmem);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void nd_pmem_notify(struct device *dev, enum nvdimm_event event)
|
|
{
|
|
struct pmem_device *pmem = dev_get_drvdata(dev);
|
|
struct nd_namespace_common *ndns = pmem->ndns;
|
|
struct nd_region *nd_region = to_nd_region(dev->parent);
|
|
struct nd_namespace_io *nsio = to_nd_namespace_io(&ndns->dev);
|
|
struct resource res = {
|
|
.start = nsio->res.start + pmem->data_offset,
|
|
.end = nsio->res.end,
|
|
};
|
|
|
|
if (event != NVDIMM_REVALIDATE_POISON)
|
|
return;
|
|
|
|
if (is_nd_pfn(dev)) {
|
|
struct nd_pfn *nd_pfn = to_nd_pfn(dev);
|
|
struct nd_pfn_sb *pfn_sb = nd_pfn->pfn_sb;
|
|
|
|
res.start += __le32_to_cpu(pfn_sb->start_pad);
|
|
res.end -= __le32_to_cpu(pfn_sb->end_trunc);
|
|
}
|
|
|
|
nvdimm_badblocks_populate(nd_region, &pmem->bb, &res);
|
|
}
|
|
|
|
MODULE_ALIAS("pmem");
|
|
MODULE_ALIAS_ND_DEVICE(ND_DEVICE_NAMESPACE_IO);
|
|
MODULE_ALIAS_ND_DEVICE(ND_DEVICE_NAMESPACE_PMEM);
|
|
static struct nd_device_driver nd_pmem_driver = {
|
|
.probe = nd_pmem_probe,
|
|
.remove = nd_pmem_remove,
|
|
.notify = nd_pmem_notify,
|
|
.drv = {
|
|
.name = "nd_pmem",
|
|
},
|
|
.type = ND_DRIVER_NAMESPACE_IO | ND_DRIVER_NAMESPACE_PMEM,
|
|
};
|
|
|
|
static int __init pmem_init(void)
|
|
{
|
|
return nd_driver_register(&nd_pmem_driver);
|
|
}
|
|
module_init(pmem_init);
|
|
|
|
static void pmem_exit(void)
|
|
{
|
|
driver_unregister(&nd_pmem_driver.drv);
|
|
}
|
|
module_exit(pmem_exit);
|
|
|
|
MODULE_AUTHOR("Ross Zwisler <ross.zwisler@linux.intel.com>");
|
|
MODULE_LICENSE("GPL v2");
|