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Commit 4596f554 authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge tag 'libnvdimm-fixes-4.18-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm 

Pull libnvdimm fixes from Dave Jiang:

 - ensure that a variable passed in by reference to acpi_nfit_ctl is
   always set to a value. An incremental patch is provided due to notice
   from testing in -next. The rest of the commits did not exhibit
   issues.

 - fix a return path in nsio_rw_bytes() that was not returning "bytes
   remain" as expected for the function.

 - address an issue where applications polling on scrub-completion for
   the NVDIMM may falsely wakeup and read the wrong state value and
   cause hang.

 - change the test unit persistent capability attribute to fix up a
   broken assumption in the unit test infrastructure wrt the
   'write_cache' attribute

 - ratelimit dev_info() in the dax device check_vma() function since
   this is easily triggered from userspace

* tag 'libnvdimm-fixes-4.18-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm:
  nfit: fix unchecked dereference in acpi_nfit_ctl
  acpi, nfit: Fix scrub idle detection
  tools/testing/nvdimm: advertise a write cache for nfit_test
  acpi/nfit: fix cmd_rc for acpi_nfit_ctl to always return a value
  dev-dax: check_vma: ratelimit dev_info-s
  libnvdimm, pmem: Fix memcpy_mcsafe() return code handling in nsio_rw_bytes()
parents 63f04777 ee6581ce

drivers/acpi/nfit/core.c

+37 −11
Original line number Diff line number Diff line
@@ -408,6 +408,8 @@ int acpi_nfit_ctl(struct nvdimm_bus_descriptor *nd_desc, struct nvdimm *nvdimm, 
	const guid_t *guid;

	int rc, i;



	if (cmd_rc)

		*cmd_rc = -EINVAL;

	func = cmd;

	if (cmd == ND_CMD_CALL) {

		call_pkg = buf;
@@ -518,6 +520,8 @@ int acpi_nfit_ctl(struct nvdimm_bus_descriptor *nd_desc, struct nvdimm *nvdimm, 
		 * If we return an error (like elsewhere) then caller wouldn't

		 * be able to rely upon data returned to make calculation.

		 */

		if (cmd_rc)

			*cmd_rc = 0;

		return 0;

	}
@@ -1273,7 +1277,7 @@ static ssize_t scrub_show(struct device *dev, 


		mutex_lock(&acpi_desc->init_mutex);

		rc = sprintf(buf, "%d%s", acpi_desc->scrub_count,

				work_busy(&acpi_desc->dwork.work)

				acpi_desc->scrub_busy

				&& !acpi_desc->cancel ? "+\n" : "\n");

		mutex_unlock(&acpi_desc->init_mutex);

	}
@@ -2939,6 +2943,32 @@ static unsigned int __acpi_nfit_scrub(struct acpi_nfit_desc *acpi_desc, 
	return 0;

}



static void __sched_ars(struct acpi_nfit_desc *acpi_desc, unsigned int tmo)

{

	lockdep_assert_held(&acpi_desc->init_mutex);



	acpi_desc->scrub_busy = 1;

	/* note this should only be set from within the workqueue */

	if (tmo)

		acpi_desc->scrub_tmo = tmo;

	queue_delayed_work(nfit_wq, &acpi_desc->dwork, tmo * HZ);

}



static void sched_ars(struct acpi_nfit_desc *acpi_desc)

{

	__sched_ars(acpi_desc, 0);

}



static void notify_ars_done(struct acpi_nfit_desc *acpi_desc)

{

	lockdep_assert_held(&acpi_desc->init_mutex);



	acpi_desc->scrub_busy = 0;

	acpi_desc->scrub_count++;

	if (acpi_desc->scrub_count_state)

		sysfs_notify_dirent(acpi_desc->scrub_count_state);

}



static void acpi_nfit_scrub(struct work_struct *work)

{

	struct acpi_nfit_desc *acpi_desc;
@@ -2949,14 +2979,10 @@ static void acpi_nfit_scrub(struct work_struct *work) 
	mutex_lock(&acpi_desc->init_mutex);

	query_rc = acpi_nfit_query_poison(acpi_desc);

	tmo = __acpi_nfit_scrub(acpi_desc, query_rc);

	if (tmo) {

		queue_delayed_work(nfit_wq, &acpi_desc->dwork, tmo * HZ);

		acpi_desc->scrub_tmo = tmo;

	} else {

		acpi_desc->scrub_count++;

		if (acpi_desc->scrub_count_state)

			sysfs_notify_dirent(acpi_desc->scrub_count_state);

	}

	if (tmo)

		__sched_ars(acpi_desc, tmo);

	else

		notify_ars_done(acpi_desc);

	memset(acpi_desc->ars_status, 0, acpi_desc->max_ars);

	mutex_unlock(&acpi_desc->init_mutex);

}
@@ -3037,7 +3063,7 @@ static int acpi_nfit_register_regions(struct acpi_nfit_desc *acpi_desc) 
			break;

		}



	queue_delayed_work(nfit_wq, &acpi_desc->dwork, 0);

	sched_ars(acpi_desc);

	return 0;

}
@@ -3239,7 +3265,7 @@ int acpi_nfit_ars_rescan(struct acpi_nfit_desc *acpi_desc, unsigned long flags) 
		}

	}

	if (scheduled) {

		queue_delayed_work(nfit_wq, &acpi_desc->dwork, 0);

		sched_ars(acpi_desc);

		dev_dbg(dev, "ars_scan triggered\n");

	}

	mutex_unlock(&acpi_desc->init_mutex);

drivers/acpi/nfit/nfit.h

+1 −0
Original line number Diff line number Diff line
@@ -203,6 +203,7 @@ struct acpi_nfit_desc { 
	unsigned int max_ars;

	unsigned int scrub_count;

	unsigned int scrub_mode;

	unsigned int scrub_busy:1;

	unsigned int cancel:1;

	unsigned long dimm_cmd_force_en;

	unsigned long bus_cmd_force_en;

drivers/dax/device.c

+8 −4
Original line number Diff line number Diff line
@@ -189,14 +189,16 @@ static int check_vma(struct dev_dax *dev_dax, struct vm_area_struct *vma, 


	/* prevent private mappings from being established */

	if ((vma->vm_flags & VM_MAYSHARE) != VM_MAYSHARE) {

		dev_info(dev, "%s: %s: fail, attempted private mapping\n",

		dev_info_ratelimited(dev,

				"%s: %s: fail, attempted private mapping\n",

				current->comm, func);

		return -EINVAL;

	}



	mask = dax_region->align - 1;

	if (vma->vm_start & mask || vma->vm_end & mask) {

		dev_info(dev, "%s: %s: fail, unaligned vma (%#lx - %#lx, %#lx)\n",

		dev_info_ratelimited(dev,

				"%s: %s: fail, unaligned vma (%#lx - %#lx, %#lx)\n",

				current->comm, func, vma->vm_start, vma->vm_end,

				mask);

		return -EINVAL;
@@ -204,13 +206,15 @@ static int check_vma(struct dev_dax *dev_dax, struct vm_area_struct *vma, 


	if ((dax_region->pfn_flags & (PFN_DEV|PFN_MAP)) == PFN_DEV

			&& (vma->vm_flags & VM_DONTCOPY) == 0) {

		dev_info(dev, "%s: %s: fail, dax range requires MADV_DONTFORK\n",

		dev_info_ratelimited(dev,

				"%s: %s: fail, dax range requires MADV_DONTFORK\n",

				current->comm, func);

		return -EINVAL;

	}



	if (!vma_is_dax(vma)) {

		dev_info(dev, "%s: %s: fail, vma is not DAX capable\n",

		dev_info_ratelimited(dev,

				"%s: %s: fail, vma is not DAX capable\n",

				current->comm, func);

		return -EINVAL;

	}

drivers/nvdimm/claim.c

+1 −0
Original line number Diff line number Diff line
@@ -278,6 +278,7 @@ static int nsio_rw_bytes(struct nd_namespace_common *ndns, 
			return -EIO;

		if (memcpy_mcsafe(buf, nsio->addr + offset, size) != 0)

			return -EIO;

		return 0;

	}



	if (unlikely(is_bad_pmem(&nsio->bb, sector, sz_align))) {

tools/testing/nvdimm/test/nfit.c

+1 −2
Original line number Diff line number Diff line
@@ -1991,8 +1991,7 @@ static void nfit_test0_setup(struct nfit_test *t) 
	pcap->header.type = ACPI_NFIT_TYPE_CAPABILITIES;

	pcap->header.length = sizeof(*pcap);

	pcap->highest_capability = 1;

	pcap->capabilities = ACPI_NFIT_CAPABILITY_CACHE_FLUSH |

		ACPI_NFIT_CAPABILITY_MEM_FLUSH;

	pcap->capabilities = ACPI_NFIT_CAPABILITY_MEM_FLUSH;

	offset += pcap->header.length;



	if (t->setup_hotplug) {