Exemplo n.º 1
0
int nd_pfn_probe(struct nd_namespace_common *ndns, void *drvdata)
{
	int rc;
	struct device *dev;
	struct nd_pfn *nd_pfn;
	struct nd_pfn_sb *pfn_sb;
	struct nd_region *nd_region = to_nd_region(ndns->dev.parent);

	if (ndns->force_raw)
		return -ENODEV;

	nvdimm_bus_lock(&ndns->dev);
	dev = __nd_pfn_create(nd_region, NULL, PFN_MODE_NONE, ndns);
	nvdimm_bus_unlock(&ndns->dev);
	if (!dev)
		return -ENOMEM;
	dev_set_drvdata(dev, drvdata);
	pfn_sb = kzalloc(sizeof(*pfn_sb), GFP_KERNEL);
	nd_pfn = to_nd_pfn(dev);
	nd_pfn->pfn_sb = pfn_sb;
	rc = nd_pfn_validate(nd_pfn);
	nd_pfn->pfn_sb = NULL;
	kfree(pfn_sb);
	dev_dbg(&ndns->dev, "%s: pfn: %s\n", __func__,
			rc == 0 ? dev_name(dev) : "<none>");
	if (rc < 0) {
		__nd_detach_ndns(dev, &nd_pfn->ndns);
		put_device(dev);
	} else
		__nd_device_register(&nd_pfn->dev);

	return rc;
}
Exemplo n.º 2
0
int nd_pfn_probe(struct device *dev, struct nd_namespace_common *ndns)
{
	int rc;
	struct nd_pfn *nd_pfn;
	struct device *pfn_dev;
	struct nd_pfn_sb *pfn_sb;
	struct nd_region *nd_region = to_nd_region(ndns->dev.parent);

	if (ndns->force_raw)
		return -ENODEV;

	switch (ndns->claim_class) {
	case NVDIMM_CCLASS_NONE:
	case NVDIMM_CCLASS_PFN:
		break;
	default:
		return -ENODEV;
	}

	nvdimm_bus_lock(&ndns->dev);
	nd_pfn = nd_pfn_alloc(nd_region);
	pfn_dev = nd_pfn_devinit(nd_pfn, ndns);
	nvdimm_bus_unlock(&ndns->dev);
	if (!pfn_dev)
		return -ENOMEM;
	pfn_sb = devm_kzalloc(dev, sizeof(*pfn_sb), GFP_KERNEL);
	nd_pfn = to_nd_pfn(pfn_dev);
	nd_pfn->pfn_sb = pfn_sb;
	rc = nd_pfn_validate(nd_pfn, PFN_SIG);
	dev_dbg(dev, "%s: pfn: %s\n", __func__,
			rc == 0 ? dev_name(pfn_dev) : "<none>");
	if (rc < 0) {
		nd_detach_ndns(pfn_dev, &nd_pfn->ndns);
		put_device(pfn_dev);
	} else
		__nd_device_register(pfn_dev);

	return rc;
}
Exemplo n.º 3
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;
	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 == 0 || rc == -EBUSY)
		return rc;

	/* section alignment for simple hotplug */
	if (nvdimm_namespace_capacity(ndns) < ND_PFN_ALIGN
			|| pmem->phys_addr & ND_PFN_MASK)
		return -ENODEV;

	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));
	npfns = (pmem->size - SZ_8K) / SZ_4K;
	/*
	 * 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.
	 */
	if (nd_pfn->mode == PFN_MODE_PMEM)
		offset = ALIGN(SZ_8K + 64 * npfns, PMD_SIZE);
	else if (nd_pfn->mode == PFN_MODE_RAM)
		offset = SZ_8K;
	else
		goto err;

	npfns = (pmem->size - offset) / 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);
	pfn_sb->version_major = cpu_to_le16(1);
	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;
}
Exemplo n.º 4
0
static int nd_pfn_init(struct nd_pfn *nd_pfn)
{
	u32 dax_label_reserve = is_nd_dax(&nd_pfn->dev) ? SZ_128K : 0;
	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;
	struct nd_pfn_sb *pfn_sb;
	unsigned long npfns;
	phys_addr_t offset;
	const char *sig;
	u64 checksum;
	int rc;

	pfn_sb = devm_kzalloc(&nd_pfn->dev, sizeof(*pfn_sb), GFP_KERNEL);
	if (!pfn_sb)
		return -ENOMEM;

	nd_pfn->pfn_sb = pfn_sb;
	if (is_nd_dax(&nd_pfn->dev))
		sig = DAX_SIG;
	else
		sig = PFN_SIG;
	rc = nd_pfn_validate(nd_pfn, sig);
	if (rc != -ENODEV)
		return rc;

	/* no info block, do init */;
	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));
		return -ENXIO;
	}

	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;
	size = resource_size(&nsio->res);
	npfns = PFN_SECTION_ALIGN_UP((size - start_pad - end_trunc - SZ_8K)
			/ PAGE_SIZE);
	if (nd_pfn->mode == PFN_MODE_PMEM) {
		/*
		 * The altmap should be padded out to the block size used
		 * when populating the vmemmap. This *should* be equal to
		 * PMD_SIZE for most architectures.
		 */
		offset = ALIGN(start + SZ_8K + 64 * npfns + dax_label_reserve,
				max(nd_pfn->align, PMD_SIZE)) - start;
	} else if (nd_pfn->mode == PFN_MODE_RAM)
		offset = ALIGN(start + SZ_8K + dax_label_reserve,
				nd_pfn->align) - start;
	else
		return -ENXIO;

	if (offset + start_pad + end_trunc >= size) {
		dev_err(&nd_pfn->dev, "%s unable to satisfy requested alignment\n",
				dev_name(&ndns->dev));
		return -ENXIO;
	}

	npfns = (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, 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(2);
	pfn_sb->start_pad = cpu_to_le32(start_pad);
	pfn_sb->end_trunc = cpu_to_le32(end_trunc);
	pfn_sb->align = cpu_to_le32(nd_pfn->align);
	checksum = nd_sb_checksum((struct nd_gen_sb *) pfn_sb);
	pfn_sb->checksum = cpu_to_le64(checksum);

	return nvdimm_write_bytes(ndns, SZ_4K, pfn_sb, sizeof(*pfn_sb), 0);
}