From 6ec689542b5bc516187917d49b112847dfb75b0b Mon Sep 17 00:00:00 2001 From: Vishal Verma Date: Wed, 29 Jul 2015 14:58:09 -0600 Subject: libnvdimm, btt: write and validate parent_uuid When a BTT is instantiated on a namespace it must validate the namespace uuid matches the 'parent_uuid' stored in the btt superblock. This property enforces that changing the namespace UUID invalidates all former BTT instances on that storage. For "IO namespaces" that don't have a label or UUID, the parent_uuid is set to zero, and this validation is skipped. For such cases, old BTTs have to be invalidated by forcing the namespace to raw mode, and overwriting the BTT info blocks. Based on a patch by Dan Williams Signed-off-by: Vishal Verma Signed-off-by: Dan Williams --- drivers/nvdimm/namespace_devs.c | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) (limited to 'drivers/nvdimm/namespace_devs.c') diff --git a/drivers/nvdimm/namespace_devs.c b/drivers/nvdimm/namespace_devs.c index fef0dd80d4ad..b18ffea9d85b 100644 --- a/drivers/nvdimm/namespace_devs.c +++ b/drivers/nvdimm/namespace_devs.c @@ -100,6 +100,26 @@ const char *nvdimm_namespace_disk_name(struct nd_namespace_common *ndns, } EXPORT_SYMBOL(nvdimm_namespace_disk_name); +const u8 *nd_dev_to_uuid(struct device *dev) +{ + static const u8 null_uuid[16]; + + if (!dev) + return null_uuid; + + if (is_namespace_pmem(dev)) { + struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev); + + return nspm->uuid; + } else if (is_namespace_blk(dev)) { + struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev); + + return nsblk->uuid; + } else + return null_uuid; +} +EXPORT_SYMBOL(nd_dev_to_uuid); + static ssize_t nstype_show(struct device *dev, struct device_attribute *attr, char *buf) { -- cgit v1.2.3 From e1455744b27c9e6115c3508a7b2902157c2c4347 Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Thu, 30 Jul 2015 17:57:47 -0400 Subject: libnvdimm, pfn: 'struct page' provider infrastructure Implement the base infrastructure for libnvdimm PFN devices. Similar to BTT devices they take a namespace as a backing device and layer functionality on top. In this case the functionality is reserving space for an array of 'struct page' entries to be handed out through pfn_to_page(). For now this is just the basic libnvdimm-device-model for configuring the base PFN device. As the namespace claiming mechanism for PFN devices is mostly identical to BTT devices drivers/nvdimm/claim.c is created to house the common bits. Cc: Ross Zwisler Signed-off-by: Dan Williams --- drivers/nvdimm/namespace_devs.c | 34 ++++++++++++++++++++++++++-------- 1 file changed, 26 insertions(+), 8 deletions(-) (limited to 'drivers/nvdimm/namespace_devs.c') diff --git a/drivers/nvdimm/namespace_devs.c b/drivers/nvdimm/namespace_devs.c index b18ffea9d85b..9303ca29be9b 100644 --- a/drivers/nvdimm/namespace_devs.c +++ b/drivers/nvdimm/namespace_devs.c @@ -82,8 +82,16 @@ const char *nvdimm_namespace_disk_name(struct nd_namespace_common *ndns, struct nd_region *nd_region = to_nd_region(ndns->dev.parent); const char *suffix = ""; - if (ndns->claim && is_nd_btt(ndns->claim)) - suffix = "s"; + if (ndns->claim) { + if (is_nd_btt(ndns->claim)) + suffix = "s"; + else if (is_nd_pfn(ndns->claim)) + suffix = "m"; + else + dev_WARN_ONCE(&ndns->dev, 1, + "unknown claim type by %s\n", + dev_name(ndns->claim)); + } if (is_namespace_pmem(&ndns->dev) || is_namespace_io(&ndns->dev)) sprintf(name, "pmem%d%s", nd_region->id, suffix); @@ -1255,12 +1263,22 @@ static const struct attribute_group *nd_namespace_attribute_groups[] = { struct nd_namespace_common *nvdimm_namespace_common_probe(struct device *dev) { struct nd_btt *nd_btt = is_nd_btt(dev) ? to_nd_btt(dev) : NULL; + struct nd_pfn *nd_pfn = is_nd_pfn(dev) ? to_nd_pfn(dev) : NULL; struct nd_namespace_common *ndns; resource_size_t size; - if (nd_btt) { - ndns = nd_btt->ndns; - if (!ndns) + if (nd_btt || nd_pfn) { + struct device *host = NULL; + + if (nd_btt) { + host = &nd_btt->dev; + ndns = nd_btt->ndns; + } else if (nd_pfn) { + host = &nd_pfn->dev; + ndns = nd_pfn->ndns; + } + + if (!ndns || !host) return ERR_PTR(-ENODEV); /* @@ -1271,12 +1289,12 @@ struct nd_namespace_common *nvdimm_namespace_common_probe(struct device *dev) device_unlock(&ndns->dev); if (ndns->dev.driver) { dev_dbg(&ndns->dev, "is active, can't bind %s\n", - dev_name(&nd_btt->dev)); + dev_name(host)); return ERR_PTR(-EBUSY); } - if (dev_WARN_ONCE(&ndns->dev, ndns->claim != &nd_btt->dev, + if (dev_WARN_ONCE(&ndns->dev, ndns->claim != host, "host (%s) vs claim (%s) mismatch\n", - dev_name(&nd_btt->dev), + dev_name(host), dev_name(ndns->claim))) return ERR_PTR(-ENXIO); } else { -- cgit v1.2.3 From 004f1afbe199e6ab20805b95aefd83ccd24bc5c7 Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Mon, 24 Aug 2015 19:20:23 -0400 Subject: libnvdimm, pmem: direct map legacy pmem by default The expectation is that the legacy / non-standard pmem discovery method (e820 type-12) will only ever be used to describe small quantities of persistent memory. Larger capacities will be described via the ACPI NFIT. When "allocate struct page from pmem" support is added this default policy can be overridden by assigning a legacy pmem namespace to a pfn device, however this would be only be necessary if a platform used the legacy mechanism to define a very large range. Cc: Christoph Hellwig Signed-off-by: Dan Williams --- drivers/nvdimm/namespace_devs.c | 35 ++++++++++++++++++++++++++++++----- 1 file changed, 30 insertions(+), 5 deletions(-) (limited to 'drivers/nvdimm/namespace_devs.c') diff --git a/drivers/nvdimm/namespace_devs.c b/drivers/nvdimm/namespace_devs.c index 9303ca29be9b..0955b2cb10fe 100644 --- a/drivers/nvdimm/namespace_devs.c +++ b/drivers/nvdimm/namespace_devs.c @@ -13,6 +13,7 @@ #include #include #include +#include #include #include "nd-core.h" #include "nd.h" @@ -76,11 +77,32 @@ static bool is_namespace_io(struct device *dev) return dev ? dev->type == &namespace_io_device_type : false; } +bool pmem_should_map_pages(struct device *dev) +{ + struct nd_region *nd_region = to_nd_region(dev->parent); + + if (!IS_ENABLED(CONFIG_ZONE_DEVICE)) + return false; + + if (!test_bit(ND_REGION_PAGEMAP, &nd_region->flags)) + return false; + + if (is_nd_pfn(dev) || is_nd_btt(dev)) + return false; + +#ifdef ARCH_MEMREMAP_PMEM + return ARCH_MEMREMAP_PMEM == MEMREMAP_WB; +#else + return false; +#endif +} +EXPORT_SYMBOL(pmem_should_map_pages); + const char *nvdimm_namespace_disk_name(struct nd_namespace_common *ndns, char *name) { struct nd_region *nd_region = to_nd_region(ndns->dev.parent); - const char *suffix = ""; + const char *suffix = NULL; if (ndns->claim) { if (is_nd_btt(ndns->claim)) @@ -93,13 +115,16 @@ const char *nvdimm_namespace_disk_name(struct nd_namespace_common *ndns, dev_name(ndns->claim)); } - if (is_namespace_pmem(&ndns->dev) || is_namespace_io(&ndns->dev)) - sprintf(name, "pmem%d%s", nd_region->id, suffix); - else if (is_namespace_blk(&ndns->dev)) { + if (is_namespace_pmem(&ndns->dev) || is_namespace_io(&ndns->dev)) { + if (!suffix && pmem_should_map_pages(&ndns->dev)) + suffix = "m"; + sprintf(name, "pmem%d%s", nd_region->id, suffix ? suffix : ""); + } else if (is_namespace_blk(&ndns->dev)) { struct nd_namespace_blk *nsblk; nsblk = to_nd_namespace_blk(&ndns->dev); - sprintf(name, "ndblk%d.%d%s", nd_region->id, nsblk->id, suffix); + sprintf(name, "ndblk%d.%d%s", nd_region->id, nsblk->id, + suffix ? suffix : ""); } else { return NULL; } -- cgit v1.2.3