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2023-12-08 01573e231f18eb2d99162747186f59511f56b64d 
 kernel/drivers/nvdimm/core.c
....@@ -1,17 +1,10 @@
1
+// SPDX-License-Identifier: GPL-2.0-only
12 /*
23  * Copyright(c) 2013-2015 Intel Corporation. All rights reserved.
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- *
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- * This program is free software; you can redistribute it and/or modify
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- * it under the terms of version 2 of the GNU General Public License as
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- * published by the Free Software Foundation.
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- *
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- * This program is distributed in the hope that it will be useful, but
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- * WITHOUT ANY WARRANTY; without even the implied warranty of
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- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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- * General Public License for more details.
124  */
135 #include <linux/libnvdimm.h>
146 #include <linux/badblocks.h>
7
+#include <linux/suspend.h>
158 #include <linux/export.h>
169 #include <linux/module.h>
1710 #include <linux/blkdev.h>
....@@ -254,7 +247,7 @@
254247  *
255248  * Enforce that uuids can only be changed while the device is disabled
256249  * (driver detached)
257
- * LOCKING: expects device_lock() is held on entry
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+ * LOCKING: expects nd_device_lock() is held on entry
258251  */
259252 int nd_uuid_store(struct device *dev, u8 **uuid_out, const char *buf,
260253 		size_t len)
....@@ -355,15 +348,15 @@
355348 
356349 static int flush_namespaces(struct device *dev, void *data)
357350 {
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-	device_lock(dev);
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-	device_unlock(dev);
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+	nd_device_lock(dev);
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+	nd_device_unlock(dev);
360353 	return 0;
361354 }
362355 
363356 static int flush_regions_dimms(struct device *dev, void *data)
364357 {
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-	device_lock(dev);
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-	device_unlock(dev);
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+	nd_device_lock(dev);
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+	nd_device_unlock(dev);
367360 	device_for_each_child(dev, NULL, flush_namespaces);
368361 	return 0;
369362 }
....@@ -393,10 +386,153 @@
393386 	NULL,
394387 };
395388 
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-struct attribute_group nvdimm_bus_attribute_group = {
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+static const struct attribute_group nvdimm_bus_attribute_group = {
397390 	.attrs = nvdimm_bus_attributes,
398391 };
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-EXPORT_SYMBOL_GPL(nvdimm_bus_attribute_group);
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+
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+static ssize_t capability_show(struct device *dev,
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+		struct device_attribute *attr, char *buf)
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+{
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+	struct nvdimm_bus *nvdimm_bus = to_nvdimm_bus(dev);
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+	struct nvdimm_bus_descriptor *nd_desc = nvdimm_bus->nd_desc;
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+	enum nvdimm_fwa_capability cap;
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+
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+	if (!nd_desc->fw_ops)
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+		return -EOPNOTSUPP;
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+
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+	cap = nd_desc->fw_ops->capability(nd_desc);
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+
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+	switch (cap) {
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+	case NVDIMM_FWA_CAP_QUIESCE:
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+		return sprintf(buf, "quiesce\n");
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+	case NVDIMM_FWA_CAP_LIVE:
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+		return sprintf(buf, "live\n");
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+	default:
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+		return -EOPNOTSUPP;
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+	}
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+}
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+
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+static DEVICE_ATTR_RO(capability);
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+
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+static ssize_t activate_show(struct device *dev,
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+		struct device_attribute *attr, char *buf)
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+{
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+	struct nvdimm_bus *nvdimm_bus = to_nvdimm_bus(dev);
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+	struct nvdimm_bus_descriptor *nd_desc = nvdimm_bus->nd_desc;
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+	enum nvdimm_fwa_capability cap;
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+	enum nvdimm_fwa_state state;
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+
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+	if (!nd_desc->fw_ops)
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+		return -EOPNOTSUPP;
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+
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+	cap = nd_desc->fw_ops->capability(nd_desc);
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+	state = nd_desc->fw_ops->activate_state(nd_desc);
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+
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+	if (cap < NVDIMM_FWA_CAP_QUIESCE)
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+		return -EOPNOTSUPP;
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+
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+	switch (state) {
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+	case NVDIMM_FWA_IDLE:
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+		return sprintf(buf, "idle\n");
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+	case NVDIMM_FWA_BUSY:
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+		return sprintf(buf, "busy\n");
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+	case NVDIMM_FWA_ARMED:
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+		return sprintf(buf, "armed\n");
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+	case NVDIMM_FWA_ARM_OVERFLOW:
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+		return sprintf(buf, "overflow\n");
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+	default:
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+		return -ENXIO;
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+	}
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+}
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+
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+static int exec_firmware_activate(void *data)
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+{
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+	struct nvdimm_bus_descriptor *nd_desc = data;
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+
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+	return nd_desc->fw_ops->activate(nd_desc);
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+}
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+
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+static ssize_t activate_store(struct device *dev,
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+		struct device_attribute *attr, const char *buf, size_t len)
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+{
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+	struct nvdimm_bus *nvdimm_bus = to_nvdimm_bus(dev);
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+	struct nvdimm_bus_descriptor *nd_desc = nvdimm_bus->nd_desc;
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+	enum nvdimm_fwa_state state;
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+	bool quiesce;
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+	ssize_t rc;
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+
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+	if (!nd_desc->fw_ops)
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+		return -EOPNOTSUPP;
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+
467
+	if (sysfs_streq(buf, "live"))
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+		quiesce = false;
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+	else if (sysfs_streq(buf, "quiesce"))
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+		quiesce = true;
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+	else
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+		return -EINVAL;
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+
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+	state = nd_desc->fw_ops->activate_state(nd_desc);
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+
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+	switch (state) {
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+	case NVDIMM_FWA_BUSY:
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+		rc = -EBUSY;
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+		break;
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+	case NVDIMM_FWA_ARMED:
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+	case NVDIMM_FWA_ARM_OVERFLOW:
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+		if (quiesce)
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+			rc = hibernate_quiet_exec(exec_firmware_activate, nd_desc);
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+		else
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+			rc = nd_desc->fw_ops->activate(nd_desc);
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+		break;
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+	case NVDIMM_FWA_IDLE:
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+	default:
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+		rc = -ENXIO;
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+	}
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+
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+	if (rc == 0)
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+		rc = len;
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+	return rc;
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+}
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+
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+static DEVICE_ATTR_ADMIN_RW(activate);
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+
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+static umode_t nvdimm_bus_firmware_visible(struct kobject *kobj, struct attribute *a, int n)
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+{
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+	struct device *dev = container_of(kobj, typeof(*dev), kobj);
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+	struct nvdimm_bus *nvdimm_bus = to_nvdimm_bus(dev);
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+	struct nvdimm_bus_descriptor *nd_desc = nvdimm_bus->nd_desc;
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+	enum nvdimm_fwa_capability cap;
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+
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+	/*
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+	 * Both 'activate' and 'capability' disappear when no ops
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+	 * detected, or a negative capability is indicated.
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+	 */
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+	if (!nd_desc->fw_ops)
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+		return 0;
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+
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+	cap = nd_desc->fw_ops->capability(nd_desc);
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+	if (cap < NVDIMM_FWA_CAP_QUIESCE)
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+		return 0;
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+
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+	return a->mode;
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+}
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+static struct attribute *nvdimm_bus_firmware_attributes[] = {
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+	&dev_attr_activate.attr,
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+	&dev_attr_capability.attr,
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+	NULL,
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+};
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+
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+static const struct attribute_group nvdimm_bus_firmware_attribute_group = {
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+	.name = "firmware",
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+	.attrs = nvdimm_bus_firmware_attributes,
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+	.is_visible = nvdimm_bus_firmware_visible,
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+};
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+
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+const struct attribute_group *nvdimm_bus_attribute_groups[] = {
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+	&nvdimm_bus_attribute_group,
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+	&nvdimm_bus_firmware_attribute_group,
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+	NULL,
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+};
400536 
401537 int nvdimm_bus_add_badrange(struct nvdimm_bus *nvdimm_bus, u64 addr, u64 length)
402538 {
....@@ -463,7 +599,6 @@
463599 	nd_region_exit();
464600 	nvdimm_exit();
465601 	nvdimm_bus_exit();
466
-	nd_region_devs_exit();
467602 	nvdimm_devs_exit();
468603 }
469604