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Commit f3683ccd authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge branch 'libnvdimm-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm 

Pull libnvdimm fixes from Dan Williams:
 "1/ Two regression fixes since v4.6: one for the byte order of a sysfs
     attribute (bz121161) and another for QEMU 2.6's NVDIMM _DSM (ACPI
     Device Specific Method) implementation that gets tripped up by new
     auto-probing behavior in the NFIT driver.

  2/ A fix tagged for -stable that stops the kernel from
     clobbering/ignoring changes to the configuration of a 'pfn'
     instance ("struct page" driver).  For example changing the
     alignment from 2M to 1G may silently revert to 2M if that value is
     currently stored on media.

  3/ A fix from Eric for an xfstests failure in dax.  It is not
     currently tagged for -stable since it requires an 8-exabyte file
     system to trigger, and there appear to be no user visible side
     effects"

* 'libnvdimm-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm:
  nfit: fix format interface code byte order
  dax: fix offset overflow in dax_io
  acpi, nfit: fix acpi_check_dsm() vs zero functions implemented
  libnvdimm, pfn, dax: fix initialization vs autodetect for mode + alignment
parents 6e5c4f13 1bcbf42d

drivers/acpi/nfit.c

+6 −6
Original line number Diff line number Diff line
@@ -928,7 +928,7 @@ static ssize_t format_show(struct device *dev, 
{

	struct acpi_nfit_control_region *dcr = to_nfit_dcr(dev);



	return sprintf(buf, "0x%04x\n", be16_to_cpu(dcr->code));

	return sprintf(buf, "0x%04x\n", le16_to_cpu(dcr->code));

}

static DEVICE_ATTR_RO(format);
@@ -961,8 +961,8 @@ static ssize_t format1_show(struct device *dev, 
				continue;

			if (nfit_dcr->dcr->code == dcr->code)

				continue;

			rc = sprintf(buf, "%#x\n",

					be16_to_cpu(nfit_dcr->dcr->code));

			rc = sprintf(buf, "0x%04x\n",

					le16_to_cpu(nfit_dcr->dcr->code));

			break;

		}

		if (rc != ENXIO)
@@ -1131,11 +1131,11 @@ static int acpi_nfit_add_dimm(struct acpi_nfit_desc *acpi_desc, 


	/*

	 * Until standardization materializes we need to consider up to 3

	 * different command sets.  Note, that checking for function0 (bit0)

	 * tells us if any commands are reachable through this uuid.

	 * different command sets.  Note, that checking for zero functions

	 * tells us if any commands might be reachable through this uuid.

	 */

	for (i = NVDIMM_FAMILY_INTEL; i <= NVDIMM_FAMILY_HPE2; i++)

		if (acpi_check_dsm(adev_dimm->handle, to_nfit_uuid(i), 1, 1))

		if (acpi_check_dsm(adev_dimm->handle, to_nfit_uuid(i), 1, 0))

			break;



	/* limit the supported commands to those that are publicly documented */

drivers/acpi/nfit.h

+5 −5
Original line number Diff line number Diff line
@@ -53,12 +53,12 @@ enum nfit_uuids { 
};



/*

 * Region format interface codes are stored as an array of bytes in the

 * NFIT DIMM Control Region structure

 * Region format interface codes are stored with the interface as the

 * LSB and the function as the MSB.

 */

#define NFIT_FIC_BYTE cpu_to_be16(0x101) /* byte-addressable energy backed */

#define NFIT_FIC_BLK cpu_to_be16(0x201) /* block-addressable non-energy backed */

#define NFIT_FIC_BYTEN cpu_to_be16(0x301) /* byte-addressable non-energy backed */

#define NFIT_FIC_BYTE cpu_to_le16(0x101) /* byte-addressable energy backed */

#define NFIT_FIC_BLK cpu_to_le16(0x201) /* block-addressable non-energy backed */

#define NFIT_FIC_BYTEN cpu_to_le16(0x301) /* byte-addressable non-energy backed */



enum {

	NFIT_BLK_READ_FLUSH = 1,

drivers/acpi/utils.c

+3 −3
Original line number Diff line number Diff line
@@ -680,9 +680,6 @@ bool acpi_check_dsm(acpi_handle handle, const u8 *uuid, u64 rev, u64 funcs) 
	u64 mask = 0;

	union acpi_object *obj;



	if (funcs == 0)

		return false;



	obj = acpi_evaluate_dsm(handle, uuid, rev, 0, NULL);

	if (!obj)

		return false;
@@ -695,6 +692,9 @@ bool acpi_check_dsm(acpi_handle handle, const u8 *uuid, u64 rev, u64 funcs) 
			mask |= (((u64)obj->buffer.pointer[i]) << (i * 8));

	ACPI_FREE(obj);



	if (funcs == 0)

		return true;



	/*

	 * Bit 0 indicates whether there's support for any functions other than

	 * function 0 for the specified UUID and revision.

drivers/nvdimm/pfn_devs.c

+40 −11
Original line number Diff line number Diff line
@@ -344,6 +344,8 @@ struct device *nd_pfn_create(struct nd_region *nd_region) 
int nd_pfn_validate(struct nd_pfn *nd_pfn, const char *sig)

{

	u64 checksum, offset;

	unsigned long align;

	enum nd_pfn_mode mode;

	struct nd_namespace_io *nsio;

	struct nd_pfn_sb *pfn_sb = nd_pfn->pfn_sb;

	struct nd_namespace_common *ndns = nd_pfn->ndns;
@@ -386,22 +388,50 @@ int nd_pfn_validate(struct nd_pfn *nd_pfn, const char *sig) 
		return -ENXIO;

	}



	align = le32_to_cpu(pfn_sb->align);

	offset = le64_to_cpu(pfn_sb->dataoff);

	if (align == 0)

		align = 1UL << ilog2(offset);

	mode = le32_to_cpu(pfn_sb->mode);



	if (!nd_pfn->uuid) {

		/* from probe we allocate */

		/*

		 * When probing a namepace via nd_pfn_probe() the uuid

		 * is NULL (see: nd_pfn_devinit()) we init settings from

		 * pfn_sb

		 */

		nd_pfn->uuid = kmemdup(pfn_sb->uuid, 16, GFP_KERNEL);

		if (!nd_pfn->uuid)

			return -ENOMEM;

		nd_pfn->align = align;

		nd_pfn->mode = mode;

	} else {

		/* from init we validate */

		/*

		 * When probing a pfn / dax instance we validate the

		 * live settings against the pfn_sb

		 */

		if (memcmp(nd_pfn->uuid, pfn_sb->uuid, 16) != 0)

			return -ENODEV;



		/*

		 * If the uuid validates, but other settings mismatch

		 * return EINVAL because userspace has managed to change

		 * the configuration without specifying new

		 * identification.

		 */

		if (nd_pfn->align != align || nd_pfn->mode != mode) {

			dev_err(&nd_pfn->dev,

					"init failed, settings mismatch\n");

			dev_dbg(&nd_pfn->dev, "align: %lx:%lx mode: %d:%d\n",

					nd_pfn->align, align, nd_pfn->mode,

					mode);

			return -EINVAL;

		}

	}



	if (nd_pfn->align == 0)

		nd_pfn->align = le32_to_cpu(pfn_sb->align);

	if (nd_pfn->align > nvdimm_namespace_capacity(ndns)) {

	if (align > nvdimm_namespace_capacity(ndns)) {

		dev_err(&nd_pfn->dev, "alignment: %lx exceeds capacity %llx\n",

				nd_pfn->align, nvdimm_namespace_capacity(ndns));

				align, nvdimm_namespace_capacity(ndns));

		return -EINVAL;

	}
@@ -411,7 +441,6 @@ int nd_pfn_validate(struct nd_pfn *nd_pfn, const char *sig) 
	 * namespace has changed since the pfn superblock was

	 * established.

	 */

	offset = le64_to_cpu(pfn_sb->dataoff);

	nsio = to_nd_namespace_io(&ndns->dev);

	if (offset >= resource_size(&nsio->res)) {

		dev_err(&nd_pfn->dev, "pfn array size exceeds capacity of %s\n",
@@ -419,10 +448,11 @@ int nd_pfn_validate(struct nd_pfn *nd_pfn, const char *sig) 
		return -EBUSY;

	}



	if ((nd_pfn->align && !IS_ALIGNED(offset, nd_pfn->align))

	if ((align && !IS_ALIGNED(offset, align))

			|| !IS_ALIGNED(offset, PAGE_SIZE)) {

		dev_err(&nd_pfn->dev, "bad offset: %#llx dax disabled\n",

				offset);

		dev_err(&nd_pfn->dev,

				"bad offset: %#llx dax disabled align: %#lx\n",

				offset, align);

		return -ENXIO;

	}
@@ -502,7 +532,6 @@ static struct vmem_altmap *__nvdimm_setup_pfn(struct nd_pfn *nd_pfn, 
	res->start += start_pad;

	res->end -= end_trunc;



	nd_pfn->mode = le32_to_cpu(nd_pfn->pfn_sb->mode);

	if (nd_pfn->mode == PFN_MODE_RAM) {

		if (offset < SZ_8K)

			return ERR_PTR(-EINVAL);

fs/dax.c

+6 −1
Original line number Diff line number Diff line
@@ -208,7 +208,12 @@ static ssize_t dax_io(struct inode *inode, struct iov_iter *iter, 
				dax.addr += first;

				size = map_len - first;

			}

			max = min(pos + size, end);

			/*

			 * pos + size is one past the last offset for IO,

			 * so pos + size can overflow loff_t at extreme offsets.

			 * Cast to u64 to catch this and get the true minimum.

			 */

			max = min_t(u64, pos + size, end);

		}



		if (iov_iter_rw(iter) == WRITE) {