#include "nd.h"
struct pmem_device {
- struct request_queue *pmem_queue;
- struct gendisk *pmem_disk;
- struct nd_namespace_common *ndns;
-
/* One contiguous memory region per device */
phys_addr_t phys_addr;
/* when non-zero this device is hosting a 'pfn' instance */
struct badblocks bb;
};
-static bool is_bad_pmem(struct badblocks *bb, sector_t sector, unsigned int len)
-{
- if (bb->count) {
- sector_t first_bad;
- int num_bad;
-
- return !!badblocks_check(bb, sector, len / 512, &first_bad,
- &num_bad);
- }
-
- return false;
-}
-
static void pmem_clear_poison(struct pmem_device *pmem, phys_addr_t offset,
unsigned int len)
{
- struct device *dev = disk_to_dev(pmem->pmem_disk);
+ struct device *dev = pmem->bb.dev;
sector_t sector;
long cleared;
unsigned long start;
struct bio_vec bvec;
struct bvec_iter iter;
- struct block_device *bdev = bio->bi_bdev;
- struct pmem_device *pmem = bdev->bd_disk->private_data;
+ struct pmem_device *pmem = q->queuedata;
do_acct = nd_iostat_start(bio, &start);
bio_for_each_segment(bvec, bio, iter) {
static int pmem_rw_page(struct block_device *bdev, sector_t sector,
struct page *page, int rw)
{
- struct pmem_device *pmem = bdev->bd_disk->private_data;
+ struct pmem_device *pmem = bdev->bd_queue->queuedata;
int rc;
rc = pmem_do_bvec(pmem, page, PAGE_SIZE, 0, rw, sector);
static long pmem_direct_access(struct block_device *bdev, sector_t sector,
void __pmem **kaddr, pfn_t *pfn, long size)
{
- struct pmem_device *pmem = bdev->bd_disk->private_data;
+ struct pmem_device *pmem = bdev->bd_queue->queuedata;
resource_size_t offset = sector * 512 + pmem->data_offset;
if (unlikely(is_bad_pmem(&pmem->bb, sector, size)))
.revalidate_disk = nvdimm_revalidate_disk,
};
-static struct pmem_device *pmem_alloc(struct device *dev,
- struct resource *res, int id)
+static void pmem_release_queue(void *q)
+{
+ blk_cleanup_queue(q);
+}
+
+void pmem_release_disk(void *disk)
+{
+ del_gendisk(disk);
+ put_disk(disk);
+}
+
+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 vmem_altmap __altmap, *altmap = NULL;
+ struct resource *res = &nsio->res;
+ struct nd_pfn *nd_pfn = NULL;
+ int nid = dev_to_node(dev);
+ struct nd_pfn_sb *pfn_sb;
struct pmem_device *pmem;
+ struct resource pfn_res;
struct request_queue *q;
+ struct gendisk *disk;
+ void *addr;
+
+ /* while nsio_rw_bytes is active, parse a pfn info block if present */
+ if (is_nd_pfn(dev)) {
+ nd_pfn = to_nd_pfn(dev);
+ altmap = nvdimm_setup_pfn(nd_pfn, &pfn_res, &__altmap);
+ if (IS_ERR(altmap))
+ return PTR_ERR(altmap);
+ }
+
+ /* we're attaching a block device, disable raw namespace access */
+ devm_nsio_disable(dev, nsio);
pmem = devm_kzalloc(dev, sizeof(*pmem), GFP_KERNEL);
if (!pmem)
- return ERR_PTR(-ENOMEM);
+ return -ENOMEM;
+ dev_set_drvdata(dev, pmem);
pmem->phys_addr = res->start;
pmem->size = resource_size(res);
if (!arch_has_wmb_pmem())
dev_warn(dev, "unable to guarantee persistence of writes\n");
- if (!devm_request_mem_region(dev, pmem->phys_addr, pmem->size,
- dev_name(dev))) {
- dev_warn(dev, "could not reserve region [0x%pa:0x%zx]\n",
- &pmem->phys_addr, pmem->size);
- return ERR_PTR(-EBUSY);
+ if (!devm_request_mem_region(dev, res->start, resource_size(res),
+ dev_name(dev))) {
+ dev_warn(dev, "could not reserve region %pR\n", res);
+ return -EBUSY;
}
q = blk_alloc_queue_node(GFP_KERNEL, dev_to_node(dev));
if (!q)
- return ERR_PTR(-ENOMEM);
+ return -ENOMEM;
pmem->pfn_flags = PFN_DEV;
- if (pmem_should_map_pages(dev)) {
- pmem->virt_addr = (void __pmem *) devm_memremap_pages(dev, res,
+ if (is_nd_pfn(dev)) {
+ addr = devm_memremap_pages(dev, &pfn_res, &q->q_usage_counter,
+ altmap);
+ pfn_sb = nd_pfn->pfn_sb;
+ pmem->data_offset = le64_to_cpu(pfn_sb->dataoff);
+ pmem->pfn_pad = resource_size(res) - resource_size(&pfn_res);
+ pmem->pfn_flags |= PFN_MAP;
+ res = &pfn_res; /* for badblocks populate */
+ res->start += pmem->data_offset;
+ } else if (pmem_should_map_pages(dev)) {
+ addr = devm_memremap_pages(dev, &nsio->res,
&q->q_usage_counter, NULL);
pmem->pfn_flags |= PFN_MAP;
} else
- pmem->virt_addr = (void __pmem *) devm_memremap(dev,
- pmem->phys_addr, pmem->size,
- ARCH_MEMREMAP_PMEM);
+ addr = devm_memremap(dev, pmem->phys_addr,
+ pmem->size, ARCH_MEMREMAP_PMEM);
- if (IS_ERR(pmem->virt_addr)) {
+ /*
+ * At release time the queue must be dead before
+ * devm_memremap_pages is unwound
+ */
+ if (devm_add_action(dev, pmem_release_queue, q)) {
blk_cleanup_queue(q);
- return (void __force *) pmem->virt_addr;
+ return -ENOMEM;
}
- pmem->pmem_queue = q;
- return pmem;
-}
+ if (IS_ERR(addr))
+ return PTR_ERR(addr);
+ pmem->virt_addr = (void __pmem *) addr;
-static void pmem_detach_disk(struct pmem_device *pmem)
-{
- if (!pmem->pmem_disk)
- return;
-
- del_gendisk(pmem->pmem_disk);
- put_disk(pmem->pmem_disk);
- blk_cleanup_queue(pmem->pmem_queue);
-}
-
-static int pmem_attach_disk(struct device *dev,
- struct nd_namespace_common *ndns, struct pmem_device *pmem)
-{
- struct nd_namespace_io *nsio = to_nd_namespace_io(&ndns->dev);
- int nid = dev_to_node(dev);
- struct resource bb_res;
- struct gendisk *disk;
-
- blk_queue_make_request(pmem->pmem_queue, pmem_make_request);
- blk_queue_physical_block_size(pmem->pmem_queue, PAGE_SIZE);
- blk_queue_max_hw_sectors(pmem->pmem_queue, UINT_MAX);
- blk_queue_bounce_limit(pmem->pmem_queue, BLK_BOUNCE_ANY);
- queue_flag_set_unlocked(QUEUE_FLAG_NONROT, pmem->pmem_queue);
+ blk_queue_make_request(q, pmem_make_request);
+ blk_queue_physical_block_size(q, PAGE_SIZE);
+ blk_queue_max_hw_sectors(q, UINT_MAX);
+ blk_queue_bounce_limit(q, BLK_BOUNCE_ANY);
+ queue_flag_set_unlocked(QUEUE_FLAG_NONROT, q);
+ q->queuedata = pmem;
disk = alloc_disk_node(0, nid);
- if (!disk) {
- blk_cleanup_queue(pmem->pmem_queue);
+ if (!disk)
+ return -ENOMEM;
+ if (devm_add_action(dev, pmem_release_disk, disk)) {
+ put_disk(disk);
return -ENOMEM;
}
disk->fops = &pmem_fops;
- disk->private_data = pmem;
- disk->queue = pmem->pmem_queue;
+ disk->queue = q;
disk->flags = GENHD_FL_EXT_DEVT;
nvdimm_namespace_disk_name(ndns, disk->disk_name);
disk->driverfs_dev = dev;
set_capacity(disk, (pmem->size - pmem->pfn_pad - pmem->data_offset)
/ 512);
- pmem->pmem_disk = disk;
- devm_exit_badblocks(dev, &pmem->bb);
if (devm_init_badblocks(dev, &pmem->bb))
return -ENOMEM;
- bb_res.start = nsio->res.start + pmem->data_offset;
- bb_res.end = nsio->res.end;
- if (is_nd_pfn(dev)) {
- struct nd_pfn *nd_pfn = to_nd_pfn(dev);
- struct nd_pfn_sb *pfn_sb = nd_pfn->pfn_sb;
-
- bb_res.start += __le32_to_cpu(pfn_sb->start_pad);
- bb_res.end -= __le32_to_cpu(pfn_sb->end_trunc);
- }
- nvdimm_badblocks_populate(to_nd_region(dev->parent), &pmem->bb,
- &bb_res);
+ nvdimm_badblocks_populate(to_nd_region(dev->parent), &pmem->bb, res);
disk->bb = &pmem->bb;
add_disk(disk);
revalidate_disk(disk);
return 0;
}
-static int pmem_rw_bytes(struct nd_namespace_common *ndns,
- resource_size_t offset, void *buf, size_t size, int rw)
-{
- struct pmem_device *pmem = dev_get_drvdata(ndns->claim);
-
- if (unlikely(offset + size > pmem->size)) {
- dev_WARN_ONCE(&ndns->dev, 1, "request out of range\n");
- return -EFAULT;
- }
-
- if (rw == READ) {
- unsigned int sz_align = ALIGN(size + (offset & (512 - 1)), 512);
-
- if (unlikely(is_bad_pmem(&pmem->bb, offset / 512, sz_align)))
- return -EIO;
- return memcpy_from_pmem(buf, pmem->virt_addr + offset, size);
- } else {
- memcpy_to_pmem(pmem->virt_addr + offset, buf, size);
- wmb_pmem();
- }
-
- return 0;
-}
-
-static int nd_pfn_init(struct nd_pfn *nd_pfn)
-{
- struct nd_pfn_sb *pfn_sb = kzalloc(sizeof(*pfn_sb), GFP_KERNEL);
- struct pmem_device *pmem = dev_get_drvdata(&nd_pfn->dev);
- struct nd_namespace_common *ndns = nd_pfn->ndns;
- u32 start_pad = 0, end_trunc = 0;
- resource_size_t start, size;
- struct nd_namespace_io *nsio;
- struct nd_region *nd_region;
- unsigned long npfns;
- phys_addr_t offset;
- u64 checksum;
- int rc;
-
- if (!pfn_sb)
- return -ENOMEM;
-
- nd_pfn->pfn_sb = pfn_sb;
- rc = nd_pfn_validate(nd_pfn);
- if (rc == -ENODEV)
- /* no info block, do init */;
- else
- return rc;
-
- nd_region = to_nd_region(nd_pfn->dev.parent);
- if (nd_region->ro) {
- dev_info(&nd_pfn->dev,
- "%s is read-only, unable to init metadata\n",
- dev_name(&nd_region->dev));
- goto err;
- }
-
- memset(pfn_sb, 0, sizeof(*pfn_sb));
-
- /*
- * Check if pmem collides with 'System RAM' when section aligned and
- * trim it accordingly
- */
- nsio = to_nd_namespace_io(&ndns->dev);
- start = PHYS_SECTION_ALIGN_DOWN(nsio->res.start);
- size = resource_size(&nsio->res);
- if (region_intersects(start, size, IORESOURCE_SYSTEM_RAM,
- IORES_DESC_NONE) == REGION_MIXED) {
-
- start = nsio->res.start;
- start_pad = PHYS_SECTION_ALIGN_UP(start) - start;
- }
-
- start = nsio->res.start;
- size = PHYS_SECTION_ALIGN_UP(start + size) - start;
- if (region_intersects(start, size, IORESOURCE_SYSTEM_RAM,
- IORES_DESC_NONE) == REGION_MIXED) {
- size = resource_size(&nsio->res);
- end_trunc = start + size - PHYS_SECTION_ALIGN_DOWN(start + size);
- }
-
- if (start_pad + end_trunc)
- dev_info(&nd_pfn->dev, "%s section collision, truncate %d bytes\n",
- dev_name(&ndns->dev), start_pad + end_trunc);
-
- /*
- * Note, we use 64 here for the standard size of struct page,
- * debugging options may cause it to be larger in which case the
- * implementation will limit the pfns advertised through
- * ->direct_access() to those that are included in the memmap.
- */
- start += start_pad;
- npfns = (pmem->size - start_pad - end_trunc - SZ_8K) / SZ_4K;
- if (nd_pfn->mode == PFN_MODE_PMEM)
- offset = ALIGN(start + SZ_8K + 64 * npfns, nd_pfn->align)
- - start;
- else if (nd_pfn->mode == PFN_MODE_RAM)
- offset = ALIGN(start + SZ_8K, nd_pfn->align) - start;
- else
- goto err;
-
- if (offset + start_pad + end_trunc >= pmem->size) {
- dev_err(&nd_pfn->dev, "%s unable to satisfy requested alignment\n",
- dev_name(&ndns->dev));
- goto err;
- }
-
- npfns = (pmem->size - offset - start_pad - end_trunc) / SZ_4K;
- pfn_sb->mode = cpu_to_le32(nd_pfn->mode);
- pfn_sb->dataoff = cpu_to_le64(offset);
- pfn_sb->npfns = cpu_to_le64(npfns);
- memcpy(pfn_sb->signature, PFN_SIG, PFN_SIG_LEN);
- memcpy(pfn_sb->uuid, nd_pfn->uuid, 16);
- memcpy(pfn_sb->parent_uuid, nd_dev_to_uuid(&ndns->dev), 16);
- pfn_sb->version_major = cpu_to_le16(1);
- pfn_sb->version_minor = cpu_to_le16(1);
- pfn_sb->start_pad = cpu_to_le32(start_pad);
- pfn_sb->end_trunc = cpu_to_le32(end_trunc);
- checksum = nd_sb_checksum((struct nd_gen_sb *) pfn_sb);
- pfn_sb->checksum = cpu_to_le64(checksum);
-
- rc = nvdimm_write_bytes(ndns, SZ_4K, pfn_sb, sizeof(*pfn_sb));
- if (rc)
- goto err;
-
- return 0;
- err:
- nd_pfn->pfn_sb = NULL;
- kfree(pfn_sb);
- return -ENXIO;
-}
-
-static int nvdimm_namespace_detach_pfn(struct nd_namespace_common *ndns)
-{
- struct nd_pfn *nd_pfn = to_nd_pfn(ndns->claim);
- struct pmem_device *pmem;
-
- /* free pmem disk */
- pmem = dev_get_drvdata(&nd_pfn->dev);
- pmem_detach_disk(pmem);
-
- /* release nd_pfn resources */
- kfree(nd_pfn->pfn_sb);
- nd_pfn->pfn_sb = NULL;
-
- return 0;
-}
-
-/*
- * We hotplug memory at section granularity, pad the reserved area from
- * the previous section base to the namespace base address.
- */
-static unsigned long init_altmap_base(resource_size_t base)
-{
- unsigned long base_pfn = PHYS_PFN(base);
-
- return PFN_SECTION_ALIGN_DOWN(base_pfn);
-}
-
-static unsigned long init_altmap_reserve(resource_size_t base)
-{
- unsigned long reserve = PHYS_PFN(SZ_8K);
- unsigned long base_pfn = PHYS_PFN(base);
-
- reserve += base_pfn - PFN_SECTION_ALIGN_DOWN(base_pfn);
- return reserve;
-}
-
-static int __nvdimm_namespace_attach_pfn(struct nd_pfn *nd_pfn)
-{
- int rc;
- struct resource res;
- struct request_queue *q;
- struct pmem_device *pmem;
- struct vmem_altmap *altmap;
- struct device *dev = &nd_pfn->dev;
- struct nd_pfn_sb *pfn_sb = nd_pfn->pfn_sb;
- struct nd_namespace_common *ndns = nd_pfn->ndns;
- u32 start_pad = __le32_to_cpu(pfn_sb->start_pad);
- u32 end_trunc = __le32_to_cpu(pfn_sb->end_trunc);
- 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 (devm_nsio_enable(dev, to_nd_namespace_io(&ndns->dev)))
+ return -ENXIO;
- if (is_nd_btt(dev)) {
- /* btt allocates its own request_queue */
- blk_cleanup_queue(pmem->pmem_queue);
- pmem->pmem_queue = NULL;
+ if (is_nd_btt(dev))
return nvdimm_namespace_attach_btt(ndns);
- }
if (is_nd_pfn(dev))
- return nvdimm_namespace_attach_pfn(ndns);
+ return pmem_attach_disk(dev, 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);
+ /* if we find a valid info-block we'll come back as that personality */
+ if (nd_btt_probe(dev, ndns) == 0 || nd_pfn_probe(dev, ndns) == 0
+ || nd_dax_probe(dev, ndns) == 0)
return -ENXIO;
- }
- return pmem_attach_disk(dev, ndns, pmem);
+ /* ...otherwise we're just a raw pmem device */
+ return pmem_attach_disk(dev, ndns);
}
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);
-
+ nvdimm_namespace_detach_btt(to_nd_btt(dev));
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,
- };
+ struct pmem_device *pmem = dev_get_drvdata(dev);
+ resource_size_t offset = 0, end_trunc = 0;
+ struct nd_namespace_common *ndns;
+ struct nd_namespace_io *nsio;
+ struct resource res;
if (event != NVDIMM_REVALIDATE_POISON)
return;
- if (is_nd_pfn(dev)) {
+ if (is_nd_btt(dev)) {
+ struct nd_btt *nd_btt = to_nd_btt(dev);
+
+ ndns = nd_btt->ndns;
+ } else 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);
- }
+ 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);
+ res.start = nsio->res.start + offset;
+ res.end = nsio->res.end - end_trunc;
nvdimm_badblocks_populate(nd_region, &pmem->bb, &res);
}
projects / mirror_ubuntu-artful-kernel.git / blobdiff