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-rw-r--r--drivers/nvdimm/pmem.c768
1 files changed, 768 insertions, 0 deletions
diff --git a/drivers/nvdimm/pmem.c b/drivers/nvdimm/pmem.c
new file mode 100644
index 0000000000..4e8fdcb3f1
--- /dev/null
+++ b/drivers/nvdimm/pmem.c
@@ -0,0 +1,768 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Persistent Memory Driver
+ *
+ * Copyright (c) 2014-2015, Intel Corporation.
+ * Copyright (c) 2015, Christoph Hellwig <hch@lst.de>.
+ * Copyright (c) 2015, Boaz Harrosh <boaz@plexistor.com>.
+ */
+
+#include <linux/blkdev.h>
+#include <linux/pagemap.h>
+#include <linux/hdreg.h>
+#include <linux/init.h>
+#include <linux/platform_device.h>
+#include <linux/set_memory.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/badblocks.h>
+#include <linux/memremap.h>
+#include <linux/kstrtox.h>
+#include <linux/vmalloc.h>
+#include <linux/blk-mq.h>
+#include <linux/pfn_t.h>
+#include <linux/slab.h>
+#include <linux/uio.h>
+#include <linux/dax.h>
+#include <linux/nd.h>
+#include <linux/mm.h>
+#include <asm/cacheflush.h>
+#include "pmem.h"
+#include "btt.h"
+#include "pfn.h"
+#include "nd.h"
+
+static struct device *to_dev(struct pmem_device *pmem)
+{
+ /*
+ * nvdimm bus services need a 'dev' parameter, and we record the device
+ * at init in bb.dev.
+ */
+ return pmem->bb.dev;
+}
+
+static struct nd_region *to_region(struct pmem_device *pmem)
+{
+ return to_nd_region(to_dev(pmem)->parent);
+}
+
+static phys_addr_t pmem_to_phys(struct pmem_device *pmem, phys_addr_t offset)
+{
+ return pmem->phys_addr + offset;
+}
+
+static sector_t to_sect(struct pmem_device *pmem, phys_addr_t offset)
+{
+ return (offset - pmem->data_offset) >> SECTOR_SHIFT;
+}
+
+static phys_addr_t to_offset(struct pmem_device *pmem, sector_t sector)
+{
+ return (sector << SECTOR_SHIFT) + pmem->data_offset;
+}
+
+static void pmem_mkpage_present(struct pmem_device *pmem, phys_addr_t offset,
+ unsigned int len)
+{
+ phys_addr_t phys = pmem_to_phys(pmem, offset);
+ unsigned long pfn_start, pfn_end, pfn;
+
+ /* only pmem in the linear map supports HWPoison */
+ if (is_vmalloc_addr(pmem->virt_addr))
+ return;
+
+ pfn_start = PHYS_PFN(phys);
+ pfn_end = pfn_start + PHYS_PFN(len);
+ for (pfn = pfn_start; pfn < pfn_end; pfn++) {
+ struct page *page = pfn_to_page(pfn);
+
+ /*
+ * Note, no need to hold a get_dev_pagemap() reference
+ * here since we're in the driver I/O path and
+ * outstanding I/O requests pin the dev_pagemap.
+ */
+ if (test_and_clear_pmem_poison(page))
+ clear_mce_nospec(pfn);
+ }
+}
+
+static void pmem_clear_bb(struct pmem_device *pmem, sector_t sector, long blks)
+{
+ if (blks == 0)
+ return;
+ badblocks_clear(&pmem->bb, sector, blks);
+ if (pmem->bb_state)
+ sysfs_notify_dirent(pmem->bb_state);
+}
+
+static long __pmem_clear_poison(struct pmem_device *pmem,
+ phys_addr_t offset, unsigned int len)
+{
+ phys_addr_t phys = pmem_to_phys(pmem, offset);
+ long cleared = nvdimm_clear_poison(to_dev(pmem), phys, len);
+
+ if (cleared > 0) {
+ pmem_mkpage_present(pmem, offset, cleared);
+ arch_invalidate_pmem(pmem->virt_addr + offset, len);
+ }
+ return cleared;
+}
+
+static blk_status_t pmem_clear_poison(struct pmem_device *pmem,
+ phys_addr_t offset, unsigned int len)
+{
+ long cleared = __pmem_clear_poison(pmem, offset, len);
+
+ if (cleared < 0)
+ return BLK_STS_IOERR;
+
+ pmem_clear_bb(pmem, to_sect(pmem, offset), cleared >> SECTOR_SHIFT);
+ if (cleared < len)
+ return BLK_STS_IOERR;
+ return BLK_STS_OK;
+}
+
+static void write_pmem(void *pmem_addr, struct page *page,
+ unsigned int off, unsigned int len)
+{
+ unsigned int chunk;
+ void *mem;
+
+ while (len) {
+ mem = kmap_atomic(page);
+ chunk = min_t(unsigned int, len, PAGE_SIZE - off);
+ memcpy_flushcache(pmem_addr, mem + off, chunk);
+ kunmap_atomic(mem);
+ len -= chunk;
+ off = 0;
+ page++;
+ pmem_addr += chunk;
+ }
+}
+
+static blk_status_t read_pmem(struct page *page, unsigned int off,
+ void *pmem_addr, unsigned int len)
+{
+ unsigned int chunk;
+ unsigned long rem;
+ void *mem;
+
+ while (len) {
+ mem = kmap_atomic(page);
+ chunk = min_t(unsigned int, len, PAGE_SIZE - off);
+ rem = copy_mc_to_kernel(mem + off, pmem_addr, chunk);
+ kunmap_atomic(mem);
+ if (rem)
+ return BLK_STS_IOERR;
+ len -= chunk;
+ off = 0;
+ page++;
+ pmem_addr += chunk;
+ }
+ return BLK_STS_OK;
+}
+
+static blk_status_t pmem_do_read(struct pmem_device *pmem,
+ struct page *page, unsigned int page_off,
+ sector_t sector, unsigned int len)
+{
+ blk_status_t rc;
+ phys_addr_t pmem_off = to_offset(pmem, sector);
+ void *pmem_addr = pmem->virt_addr + pmem_off;
+
+ if (unlikely(is_bad_pmem(&pmem->bb, sector, len)))
+ return BLK_STS_IOERR;
+
+ rc = read_pmem(page, page_off, pmem_addr, len);
+ flush_dcache_page(page);
+ return rc;
+}
+
+static blk_status_t pmem_do_write(struct pmem_device *pmem,
+ struct page *page, unsigned int page_off,
+ sector_t sector, unsigned int len)
+{
+ phys_addr_t pmem_off = to_offset(pmem, sector);
+ void *pmem_addr = pmem->virt_addr + pmem_off;
+
+ if (unlikely(is_bad_pmem(&pmem->bb, sector, len))) {
+ blk_status_t rc = pmem_clear_poison(pmem, pmem_off, len);
+
+ if (rc != BLK_STS_OK)
+ return rc;
+ }
+
+ flush_dcache_page(page);
+ write_pmem(pmem_addr, page, page_off, len);
+
+ return BLK_STS_OK;
+}
+
+static void pmem_submit_bio(struct bio *bio)
+{
+ int ret = 0;
+ blk_status_t rc = 0;
+ bool do_acct;
+ unsigned long start;
+ struct bio_vec bvec;
+ struct bvec_iter iter;
+ struct pmem_device *pmem = bio->bi_bdev->bd_disk->private_data;
+ struct nd_region *nd_region = to_region(pmem);
+
+ if (bio->bi_opf & REQ_PREFLUSH)
+ ret = nvdimm_flush(nd_region, bio);
+
+ do_acct = blk_queue_io_stat(bio->bi_bdev->bd_disk->queue);
+ if (do_acct)
+ start = bio_start_io_acct(bio);
+ bio_for_each_segment(bvec, bio, iter) {
+ if (op_is_write(bio_op(bio)))
+ rc = pmem_do_write(pmem, bvec.bv_page, bvec.bv_offset,
+ iter.bi_sector, bvec.bv_len);
+ else
+ rc = pmem_do_read(pmem, bvec.bv_page, bvec.bv_offset,
+ iter.bi_sector, bvec.bv_len);
+ if (rc) {
+ bio->bi_status = rc;
+ break;
+ }
+ }
+ if (do_acct)
+ bio_end_io_acct(bio, start);
+
+ if (bio->bi_opf & REQ_FUA)
+ ret = nvdimm_flush(nd_region, bio);
+
+ if (ret)
+ bio->bi_status = errno_to_blk_status(ret);
+
+ bio_endio(bio);
+}
+
+/* see "strong" declaration in tools/testing/nvdimm/pmem-dax.c */
+__weak long __pmem_direct_access(struct pmem_device *pmem, pgoff_t pgoff,
+ long nr_pages, enum dax_access_mode mode, void **kaddr,
+ pfn_t *pfn)
+{
+ resource_size_t offset = PFN_PHYS(pgoff) + pmem->data_offset;
+ sector_t sector = PFN_PHYS(pgoff) >> SECTOR_SHIFT;
+ unsigned int num = PFN_PHYS(nr_pages) >> SECTOR_SHIFT;
+ struct badblocks *bb = &pmem->bb;
+ sector_t first_bad;
+ int num_bad;
+
+ if (kaddr)
+ *kaddr = pmem->virt_addr + offset;
+ if (pfn)
+ *pfn = phys_to_pfn_t(pmem->phys_addr + offset, pmem->pfn_flags);
+
+ if (bb->count &&
+ badblocks_check(bb, sector, num, &first_bad, &num_bad)) {
+ long actual_nr;
+
+ if (mode != DAX_RECOVERY_WRITE)
+ return -EHWPOISON;
+
+ /*
+ * Set the recovery stride is set to kernel page size because
+ * the underlying driver and firmware clear poison functions
+ * don't appear to handle large chunk(such as 2MiB) reliably.
+ */
+ actual_nr = PHYS_PFN(
+ PAGE_ALIGN((first_bad - sector) << SECTOR_SHIFT));
+ dev_dbg(pmem->bb.dev, "start sector(%llu), nr_pages(%ld), first_bad(%llu), actual_nr(%ld)\n",
+ sector, nr_pages, first_bad, actual_nr);
+ if (actual_nr)
+ return actual_nr;
+ return 1;
+ }
+
+ /*
+ * If badblocks are present but not in the range, limit known good range
+ * to the requested range.
+ */
+ if (bb->count)
+ return nr_pages;
+ return PHYS_PFN(pmem->size - pmem->pfn_pad - offset);
+}
+
+static const struct block_device_operations pmem_fops = {
+ .owner = THIS_MODULE,
+ .submit_bio = pmem_submit_bio,
+};
+
+static int pmem_dax_zero_page_range(struct dax_device *dax_dev, pgoff_t pgoff,
+ size_t nr_pages)
+{
+ struct pmem_device *pmem = dax_get_private(dax_dev);
+
+ return blk_status_to_errno(pmem_do_write(pmem, ZERO_PAGE(0), 0,
+ PFN_PHYS(pgoff) >> SECTOR_SHIFT,
+ PAGE_SIZE));
+}
+
+static long pmem_dax_direct_access(struct dax_device *dax_dev,
+ pgoff_t pgoff, long nr_pages, enum dax_access_mode mode,
+ void **kaddr, pfn_t *pfn)
+{
+ struct pmem_device *pmem = dax_get_private(dax_dev);
+
+ return __pmem_direct_access(pmem, pgoff, nr_pages, mode, kaddr, pfn);
+}
+
+/*
+ * The recovery write thread started out as a normal pwrite thread and
+ * when the filesystem was told about potential media error in the
+ * range, filesystem turns the normal pwrite to a dax_recovery_write.
+ *
+ * The recovery write consists of clearing media poison, clearing page
+ * HWPoison bit, reenable page-wide read-write permission, flush the
+ * caches and finally write. A competing pread thread will be held
+ * off during the recovery process since data read back might not be
+ * valid, and this is achieved by clearing the badblock records after
+ * the recovery write is complete. Competing recovery write threads
+ * are already serialized by writer lock held by dax_iomap_rw().
+ */
+static size_t pmem_recovery_write(struct dax_device *dax_dev, pgoff_t pgoff,
+ void *addr, size_t bytes, struct iov_iter *i)
+{
+ struct pmem_device *pmem = dax_get_private(dax_dev);
+ size_t olen, len, off;
+ phys_addr_t pmem_off;
+ struct device *dev = pmem->bb.dev;
+ long cleared;
+
+ off = offset_in_page(addr);
+ len = PFN_PHYS(PFN_UP(off + bytes));
+ if (!is_bad_pmem(&pmem->bb, PFN_PHYS(pgoff) >> SECTOR_SHIFT, len))
+ return _copy_from_iter_flushcache(addr, bytes, i);
+
+ /*
+ * Not page-aligned range cannot be recovered. This should not
+ * happen unless something else went wrong.
+ */
+ if (off || !PAGE_ALIGNED(bytes)) {
+ dev_dbg(dev, "Found poison, but addr(%p) or bytes(%#zx) not page aligned\n",
+ addr, bytes);
+ return 0;
+ }
+
+ pmem_off = PFN_PHYS(pgoff) + pmem->data_offset;
+ cleared = __pmem_clear_poison(pmem, pmem_off, len);
+ if (cleared > 0 && cleared < len) {
+ dev_dbg(dev, "poison cleared only %ld out of %zu bytes\n",
+ cleared, len);
+ return 0;
+ }
+ if (cleared < 0) {
+ dev_dbg(dev, "poison clear failed: %ld\n", cleared);
+ return 0;
+ }
+
+ olen = _copy_from_iter_flushcache(addr, bytes, i);
+ pmem_clear_bb(pmem, to_sect(pmem, pmem_off), cleared >> SECTOR_SHIFT);
+
+ return olen;
+}
+
+static const struct dax_operations pmem_dax_ops = {
+ .direct_access = pmem_dax_direct_access,
+ .zero_page_range = pmem_dax_zero_page_range,
+ .recovery_write = pmem_recovery_write,
+};
+
+static ssize_t write_cache_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct pmem_device *pmem = dev_to_disk(dev)->private_data;
+
+ return sprintf(buf, "%d\n", !!dax_write_cache_enabled(pmem->dax_dev));
+}
+
+static ssize_t write_cache_store(struct device *dev,
+ struct device_attribute *attr, const char *buf, size_t len)
+{
+ struct pmem_device *pmem = dev_to_disk(dev)->private_data;
+ bool write_cache;
+ int rc;
+
+ rc = kstrtobool(buf, &write_cache);
+ if (rc)
+ return rc;
+ dax_write_cache(pmem->dax_dev, write_cache);
+ return len;
+}
+static DEVICE_ATTR_RW(write_cache);
+
+static umode_t dax_visible(struct kobject *kobj, struct attribute *a, int n)
+{
+#ifndef CONFIG_ARCH_HAS_PMEM_API
+ if (a == &dev_attr_write_cache.attr)
+ return 0;
+#endif
+ return a->mode;
+}
+
+static struct attribute *dax_attributes[] = {
+ &dev_attr_write_cache.attr,
+ NULL,
+};
+
+static const struct attribute_group dax_attribute_group = {
+ .name = "dax",
+ .attrs = dax_attributes,
+ .is_visible = dax_visible,
+};
+
+static const struct attribute_group *pmem_attribute_groups[] = {
+ &dax_attribute_group,
+ NULL,
+};
+
+static void pmem_release_disk(void *__pmem)
+{
+ struct pmem_device *pmem = __pmem;
+
+ dax_remove_host(pmem->disk);
+ kill_dax(pmem->dax_dev);
+ put_dax(pmem->dax_dev);
+ del_gendisk(pmem->disk);
+
+ put_disk(pmem->disk);
+}
+
+static int pmem_pagemap_memory_failure(struct dev_pagemap *pgmap,
+ unsigned long pfn, unsigned long nr_pages, int mf_flags)
+{
+ struct pmem_device *pmem =
+ container_of(pgmap, struct pmem_device, pgmap);
+ u64 offset = PFN_PHYS(pfn) - pmem->phys_addr - pmem->data_offset;
+ u64 len = nr_pages << PAGE_SHIFT;
+
+ return dax_holder_notify_failure(pmem->dax_dev, offset, len, mf_flags);
+}
+
+static const struct dev_pagemap_ops fsdax_pagemap_ops = {
+ .memory_failure = pmem_pagemap_memory_failure,
+};
+
+static int pmem_attach_disk(struct device *dev,
+ struct nd_namespace_common *ndns)
+{
+ struct nd_namespace_io *nsio = to_nd_namespace_io(&ndns->dev);
+ struct nd_region *nd_region = to_nd_region(dev->parent);
+ int nid = dev_to_node(dev), fua;
+ struct resource *res = &nsio->res;
+ struct range bb_range;
+ struct nd_pfn *nd_pfn = NULL;
+ struct dax_device *dax_dev;
+ struct nd_pfn_sb *pfn_sb;
+ struct pmem_device *pmem;
+ struct request_queue *q;
+ struct gendisk *disk;
+ void *addr;
+ int rc;
+
+ pmem = devm_kzalloc(dev, sizeof(*pmem), GFP_KERNEL);
+ if (!pmem)
+ return -ENOMEM;
+
+ rc = devm_namespace_enable(dev, ndns, nd_info_block_reserve());
+ if (rc)
+ return rc;
+
+ /* while nsio_rw_bytes is active, parse a pfn info block if present */
+ if (is_nd_pfn(dev)) {
+ nd_pfn = to_nd_pfn(dev);
+ rc = nvdimm_setup_pfn(nd_pfn, &pmem->pgmap);
+ if (rc)
+ return rc;
+ }
+
+ /* we're attaching a block device, disable raw namespace access */
+ devm_namespace_disable(dev, ndns);
+
+ dev_set_drvdata(dev, pmem);
+ pmem->phys_addr = res->start;
+ pmem->size = resource_size(res);
+ fua = nvdimm_has_flush(nd_region);
+ if (!IS_ENABLED(CONFIG_ARCH_HAS_UACCESS_FLUSHCACHE) || fua < 0) {
+ dev_warn(dev, "unable to guarantee persistence of writes\n");
+ fua = 0;
+ }
+
+ if (!devm_request_mem_region(dev, res->start, resource_size(res),
+ dev_name(&ndns->dev))) {
+ dev_warn(dev, "could not reserve region %pR\n", res);
+ return -EBUSY;
+ }
+
+ disk = blk_alloc_disk(nid);
+ if (!disk)
+ return -ENOMEM;
+ q = disk->queue;
+
+ pmem->disk = disk;
+ pmem->pgmap.owner = pmem;
+ pmem->pfn_flags = PFN_DEV;
+ if (is_nd_pfn(dev)) {
+ pmem->pgmap.type = MEMORY_DEVICE_FS_DAX;
+ pmem->pgmap.ops = &fsdax_pagemap_ops;
+ addr = devm_memremap_pages(dev, &pmem->pgmap);
+ pfn_sb = nd_pfn->pfn_sb;
+ pmem->data_offset = le64_to_cpu(pfn_sb->dataoff);
+ pmem->pfn_pad = resource_size(res) -
+ range_len(&pmem->pgmap.range);
+ pmem->pfn_flags |= PFN_MAP;
+ bb_range = pmem->pgmap.range;
+ bb_range.start += pmem->data_offset;
+ } else if (pmem_should_map_pages(dev)) {
+ pmem->pgmap.range.start = res->start;
+ pmem->pgmap.range.end = res->end;
+ pmem->pgmap.nr_range = 1;
+ pmem->pgmap.type = MEMORY_DEVICE_FS_DAX;
+ pmem->pgmap.ops = &fsdax_pagemap_ops;
+ addr = devm_memremap_pages(dev, &pmem->pgmap);
+ pmem->pfn_flags |= PFN_MAP;
+ bb_range = pmem->pgmap.range;
+ } else {
+ addr = devm_memremap(dev, pmem->phys_addr,
+ pmem->size, ARCH_MEMREMAP_PMEM);
+ bb_range.start = res->start;
+ bb_range.end = res->end;
+ }
+
+ if (IS_ERR(addr)) {
+ rc = PTR_ERR(addr);
+ goto out;
+ }
+ pmem->virt_addr = addr;
+
+ blk_queue_write_cache(q, true, fua);
+ blk_queue_physical_block_size(q, PAGE_SIZE);
+ blk_queue_logical_block_size(q, pmem_sector_size(ndns));
+ blk_queue_max_hw_sectors(q, UINT_MAX);
+ blk_queue_flag_set(QUEUE_FLAG_NONROT, q);
+ blk_queue_flag_set(QUEUE_FLAG_SYNCHRONOUS, q);
+ if (pmem->pfn_flags & PFN_MAP)
+ blk_queue_flag_set(QUEUE_FLAG_DAX, q);
+
+ disk->fops = &pmem_fops;
+ disk->private_data = pmem;
+ nvdimm_namespace_disk_name(ndns, disk->disk_name);
+ set_capacity(disk, (pmem->size - pmem->pfn_pad - pmem->data_offset)
+ / 512);
+ if (devm_init_badblocks(dev, &pmem->bb))
+ return -ENOMEM;
+ nvdimm_badblocks_populate(nd_region, &pmem->bb, &bb_range);
+ disk->bb = &pmem->bb;
+
+ dax_dev = alloc_dax(pmem, &pmem_dax_ops);
+ if (IS_ERR(dax_dev)) {
+ rc = PTR_ERR(dax_dev);
+ goto out;
+ }
+ set_dax_nocache(dax_dev);
+ set_dax_nomc(dax_dev);
+ if (is_nvdimm_sync(nd_region))
+ set_dax_synchronous(dax_dev);
+ rc = dax_add_host(dax_dev, disk);
+ if (rc)
+ goto out_cleanup_dax;
+ dax_write_cache(dax_dev, nvdimm_has_cache(nd_region));
+ pmem->dax_dev = dax_dev;
+
+ rc = device_add_disk(dev, disk, pmem_attribute_groups);
+ if (rc)
+ goto out_remove_host;
+ if (devm_add_action_or_reset(dev, pmem_release_disk, pmem))
+ return -ENOMEM;
+
+ nvdimm_check_and_set_ro(disk);
+
+ pmem->bb_state = sysfs_get_dirent(disk_to_dev(disk)->kobj.sd,
+ "badblocks");
+ if (!pmem->bb_state)
+ dev_warn(dev, "'badblocks' notification disabled\n");
+ return 0;
+
+out_remove_host:
+ dax_remove_host(pmem->disk);
+out_cleanup_dax:
+ kill_dax(pmem->dax_dev);
+ put_dax(pmem->dax_dev);
+out:
+ put_disk(pmem->disk);
+ return rc;
+}
+
+static int nd_pmem_probe(struct device *dev)
+{
+ int ret;
+ struct nd_namespace_common *ndns;
+
+ ndns = nvdimm_namespace_common_probe(dev);
+ if (IS_ERR(ndns))
+ return PTR_ERR(ndns);
+
+ if (is_nd_btt(dev))
+ return nvdimm_namespace_attach_btt(ndns);
+
+ if (is_nd_pfn(dev))
+ return pmem_attach_disk(dev, ndns);
+
+ ret = devm_namespace_enable(dev, ndns, nd_info_block_reserve());
+ if (ret)
+ return ret;
+
+ ret = nd_btt_probe(dev, ndns);
+ if (ret == 0)
+ return -ENXIO;
+
+ /*
+ * We have two failure conditions here, there is no
+ * info reserver block or we found a valid info reserve block
+ * but failed to initialize the pfn superblock.
+ *
+ * For the first case consider namespace as a raw pmem namespace
+ * and attach a disk.
+ *
+ * For the latter, consider this a success and advance the namespace
+ * seed.
+ */
+ ret = nd_pfn_probe(dev, ndns);
+ if (ret == 0)
+ return -ENXIO;
+ else if (ret == -EOPNOTSUPP)
+ return ret;
+
+ ret = nd_dax_probe(dev, ndns);
+ if (ret == 0)
+ return -ENXIO;
+ else if (ret == -EOPNOTSUPP)
+ return ret;
+
+ /* probe complete, attach handles namespace enabling */
+ devm_namespace_disable(dev, ndns);
+
+ return pmem_attach_disk(dev, ndns);
+}
+
+static void nd_pmem_remove(struct device *dev)
+{
+ struct pmem_device *pmem = dev_get_drvdata(dev);
+
+ if (is_nd_btt(dev))
+ nvdimm_namespace_detach_btt(to_nd_btt(dev));
+ else {
+ /*
+ * Note, this assumes device_lock() context to not
+ * race nd_pmem_notify()
+ */
+ sysfs_put(pmem->bb_state);
+ pmem->bb_state = NULL;
+ }
+ nvdimm_flush(to_nd_region(dev->parent), NULL);
+}
+
+static void nd_pmem_shutdown(struct device *dev)
+{
+ nvdimm_flush(to_nd_region(dev->parent), NULL);
+}
+
+static void pmem_revalidate_poison(struct device *dev)
+{
+ struct nd_region *nd_region;
+ resource_size_t offset = 0, end_trunc = 0;
+ struct nd_namespace_common *ndns;
+ struct nd_namespace_io *nsio;
+ struct badblocks *bb;
+ struct range range;
+ struct kernfs_node *bb_state;
+
+ if (is_nd_btt(dev)) {
+ struct nd_btt *nd_btt = to_nd_btt(dev);
+
+ ndns = nd_btt->ndns;
+ nd_region = to_nd_region(ndns->dev.parent);
+ nsio = to_nd_namespace_io(&ndns->dev);
+ bb = &nsio->bb;
+ bb_state = NULL;
+ } else {
+ struct pmem_device *pmem = dev_get_drvdata(dev);
+
+ nd_region = to_region(pmem);
+ bb = &pmem->bb;
+ bb_state = pmem->bb_state;
+
+ if (is_nd_pfn(dev)) {
+ struct nd_pfn *nd_pfn = to_nd_pfn(dev);
+ struct nd_pfn_sb *pfn_sb = nd_pfn->pfn_sb;
+
+ ndns = nd_pfn->ndns;
+ offset = pmem->data_offset +
+ __le32_to_cpu(pfn_sb->start_pad);
+ end_trunc = __le32_to_cpu(pfn_sb->end_trunc);
+ } else {
+ ndns = to_ndns(dev);
+ }
+
+ nsio = to_nd_namespace_io(&ndns->dev);
+ }
+
+ range.start = nsio->res.start + offset;
+ range.end = nsio->res.end - end_trunc;
+ nvdimm_badblocks_populate(nd_region, bb, &range);
+ if (bb_state)
+ sysfs_notify_dirent(bb_state);
+}
+
+static void pmem_revalidate_region(struct device *dev)
+{
+ struct pmem_device *pmem;
+
+ if (is_nd_btt(dev)) {
+ struct nd_btt *nd_btt = to_nd_btt(dev);
+ struct btt *btt = nd_btt->btt;
+
+ nvdimm_check_and_set_ro(btt->btt_disk);
+ return;
+ }
+
+ pmem = dev_get_drvdata(dev);
+ nvdimm_check_and_set_ro(pmem->disk);
+}
+
+static void nd_pmem_notify(struct device *dev, enum nvdimm_event event)
+{
+ switch (event) {
+ case NVDIMM_REVALIDATE_POISON:
+ pmem_revalidate_poison(dev);
+ break;
+ case NVDIMM_REVALIDATE_REGION:
+ pmem_revalidate_region(dev);
+ break;
+ default:
+ dev_WARN_ONCE(dev, 1, "notify: unknown event: %d\n", event);
+ break;
+ }
+}
+
+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,
+ .shutdown = nd_pmem_shutdown,
+ .drv = {
+ .name = "nd_pmem",
+ },
+ .type = ND_DRIVER_NAMESPACE_IO | ND_DRIVER_NAMESPACE_PMEM,
+};
+
+module_nd_driver(nd_pmem_driver);
+
+MODULE_AUTHOR("Ross Zwisler <ross.zwisler@linux.intel.com>");
+MODULE_LICENSE("GPL v2");
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-30 21:59:22 +0000