Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  * Copyright(c) 2013-2015 Intel Corporation. All rights reserved.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5) #include <linux/device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6) #include <linux/sizes.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7) #include "nd-core.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8) #include "pmem.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) #include "pfn.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) #include "btt.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #include "nd.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) void __nd_detach_ndns(struct device *dev, struct nd_namespace_common **_ndns)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) 	struct nd_namespace_common *ndns = *_ndns;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) 	struct nvdimm_bus *nvdimm_bus;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) 	if (!ndns)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) 	nvdimm_bus = walk_to_nvdimm_bus(&ndns->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) 	lockdep_assert_held(&nvdimm_bus->reconfig_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) 	dev_WARN_ONCE(dev, ndns->claim != dev, "%s: invalid claim\n", __func__);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) 	ndns->claim = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) 	*_ndns = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) 	put_device(&ndns->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) void nd_detach_ndns(struct device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) 		struct nd_namespace_common **_ndns)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) 	struct nd_namespace_common *ndns = *_ndns;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) 	if (!ndns)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) 	get_device(&ndns->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 	nvdimm_bus_lock(&ndns->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 	__nd_detach_ndns(dev, _ndns);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 	nvdimm_bus_unlock(&ndns->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 	put_device(&ndns->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) bool __nd_attach_ndns(struct device *dev, struct nd_namespace_common *attach,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 		struct nd_namespace_common **_ndns)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 	struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(&attach->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 	if (attach->claim)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 		return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 	lockdep_assert_held(&nvdimm_bus->reconfig_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 	dev_WARN_ONCE(dev, *_ndns, "%s: invalid claim\n", __func__);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 	attach->claim = dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 	*_ndns = attach;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 	get_device(&attach->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 	return true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) bool nd_attach_ndns(struct device *dev, struct nd_namespace_common *attach,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 		struct nd_namespace_common **_ndns)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 	bool claimed;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 	nvdimm_bus_lock(&attach->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 	claimed = __nd_attach_ndns(dev, attach, _ndns);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 	nvdimm_bus_unlock(&attach->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 	return claimed;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) static int namespace_match(struct device *dev, void *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 	char *name = data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 	return strcmp(name, dev_name(dev)) == 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) static bool is_idle(struct device *dev, struct nd_namespace_common *ndns)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 	struct nd_region *nd_region = to_nd_region(dev->parent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 	struct device *seed = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 	if (is_nd_btt(dev))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 		seed = nd_region->btt_seed;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 	else if (is_nd_pfn(dev))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 		seed = nd_region->pfn_seed;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 	else if (is_nd_dax(dev))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 		seed = nd_region->dax_seed;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 	if (seed == dev || ndns || dev->driver)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 		return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 	return true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) struct nd_pfn *to_nd_pfn_safe(struct device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 	 * pfn device attributes are re-used by dax device instances, so we
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 	 * need to be careful to correct device-to-nd_pfn conversion.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 	if (is_nd_pfn(dev))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 		return to_nd_pfn(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 	if (is_nd_dax(dev)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 		struct nd_dax *nd_dax = to_nd_dax(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 		return &nd_dax->nd_pfn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 	WARN_ON(1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 	return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) static void nd_detach_and_reset(struct device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 		struct nd_namespace_common **_ndns)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 	/* detach the namespace and destroy / reset the device */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 	__nd_detach_ndns(dev, _ndns);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 	if (is_idle(dev, *_ndns)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 		nd_device_unregister(dev, ND_ASYNC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 	} else if (is_nd_btt(dev)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 		struct nd_btt *nd_btt = to_nd_btt(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 		nd_btt->lbasize = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 		kfree(nd_btt->uuid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 		nd_btt->uuid = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 	} else if (is_nd_pfn(dev) || is_nd_dax(dev)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 		struct nd_pfn *nd_pfn = to_nd_pfn_safe(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 		kfree(nd_pfn->uuid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 		nd_pfn->uuid = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 		nd_pfn->mode = PFN_MODE_NONE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) ssize_t nd_namespace_store(struct device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 		struct nd_namespace_common **_ndns, const char *buf,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 		size_t len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 	struct nd_namespace_common *ndns;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 	struct device *found;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 	char *name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 	if (dev->driver) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 		dev_dbg(dev, "namespace already active\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 		return -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 	name = kstrndup(buf, len, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 	if (!name)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 	strim(name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 	if (strncmp(name, "namespace", 9) == 0 || strcmp(name, "") == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 		/* pass */;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 	else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 		len = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 	ndns = *_ndns;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 	if (strcmp(name, "") == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 		nd_detach_and_reset(dev, _ndns);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 	} else if (ndns) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 		dev_dbg(dev, "namespace already set to: %s\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 				dev_name(&ndns->dev));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 		len = -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 	found = device_find_child(dev->parent, name, namespace_match);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 	if (!found) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 		dev_dbg(dev, "'%s' not found under %s\n", name,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 				dev_name(dev->parent));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 		len = -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 	ndns = to_ndns(found);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 	switch (ndns->claim_class) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 	case NVDIMM_CCLASS_NONE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 	case NVDIMM_CCLASS_BTT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 	case NVDIMM_CCLASS_BTT2:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 		if (!is_nd_btt(dev)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 			len = -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 			goto out_attach;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 	case NVDIMM_CCLASS_PFN:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 		if (!is_nd_pfn(dev)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 			len = -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 			goto out_attach;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 	case NVDIMM_CCLASS_DAX:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 		if (!is_nd_dax(dev)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 			len = -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 			goto out_attach;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 	default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 		len = -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 		goto out_attach;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 	if (__nvdimm_namespace_capacity(ndns) < SZ_16M) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 		dev_dbg(dev, "%s too small to host\n", name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 		len = -ENXIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 		goto out_attach;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 	WARN_ON_ONCE(!is_nvdimm_bus_locked(dev));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 	if (!__nd_attach_ndns(dev, ndns, _ndns)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 		dev_dbg(dev, "%s already claimed\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 				dev_name(&ndns->dev));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 		len = -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221)  out_attach:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 	put_device(&ndns->dev); /* from device_find_child */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223)  out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 	kfree(name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 	return len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229)  * nd_sb_checksum: compute checksum for a generic info block
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231)  * Returns a fletcher64 checksum of everything in the given info block
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232)  * except the last field (since that's where the checksum lives).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) u64 nd_sb_checksum(struct nd_gen_sb *nd_gen_sb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 	u64 sum;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 	__le64 sum_save;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 	BUILD_BUG_ON(sizeof(struct btt_sb) != SZ_4K);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 	BUILD_BUG_ON(sizeof(struct nd_pfn_sb) != SZ_4K);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 	BUILD_BUG_ON(sizeof(struct nd_gen_sb) != SZ_4K);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 	sum_save = nd_gen_sb->checksum;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 	nd_gen_sb->checksum = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 	sum = nd_fletcher64(nd_gen_sb, sizeof(*nd_gen_sb), 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 	nd_gen_sb->checksum = sum_save;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 	return sum;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) EXPORT_SYMBOL(nd_sb_checksum);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) static int nsio_rw_bytes(struct nd_namespace_common *ndns,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 		resource_size_t offset, void *buf, size_t size, int rw,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 		unsigned long flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 	struct nd_namespace_io *nsio = to_nd_namespace_io(&ndns->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 	unsigned int sz_align = ALIGN(size + (offset & (512 - 1)), 512);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 	sector_t sector = offset >> 9;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 	int rc = 0, ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 	if (unlikely(!size))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 	if (unlikely(offset + size > nsio->size)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 		dev_WARN_ONCE(&ndns->dev, 1, "request out of range\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 		return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 	if (rw == READ) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 		if (unlikely(is_bad_pmem(&nsio->bb, sector, sz_align)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 			return -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 		if (copy_mc_to_kernel(buf, nsio->addr + offset, size) != 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 			return -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 	if (unlikely(is_bad_pmem(&nsio->bb, sector, sz_align))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 		if (IS_ALIGNED(offset, 512) && IS_ALIGNED(size, 512)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 				&& !(flags & NVDIMM_IO_ATOMIC)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 			long cleared;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 			might_sleep();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 			cleared = nvdimm_clear_poison(&ndns->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) 					nsio->res.start + offset, size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 			if (cleared < size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) 				rc = -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) 			if (cleared > 0 && cleared / 512) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) 				cleared /= 512;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) 				badblocks_clear(&nsio->bb, sector, cleared);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) 			}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) 			arch_invalidate_pmem(nsio->addr + offset, size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) 		} else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) 			rc = -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) 	memcpy_flushcache(nsio->addr + offset, buf, size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) 	ret = nvdimm_flush(to_nd_region(ndns->dev.parent), NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) 	if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) 		rc = ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) 	return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) int devm_nsio_enable(struct device *dev, struct nd_namespace_io *nsio,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) 		resource_size_t size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) 	struct nd_namespace_common *ndns = &nsio->common;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) 	struct range range = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) 		.start = nsio->res.start,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) 		.end = nsio->res.end,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) 	};
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) 	nsio->size = size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) 	if (!devm_request_mem_region(dev, range.start, size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) 				dev_name(&ndns->dev))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) 		dev_warn(dev, "could not reserve region %pR\n", &nsio->res);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) 		return -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) 	ndns->rw_bytes = nsio_rw_bytes;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) 	if (devm_init_badblocks(dev, &nsio->bb))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) 	nvdimm_badblocks_populate(to_nd_region(ndns->dev.parent), &nsio->bb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) 			&range);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) 	nsio->addr = devm_memremap(dev, range.start, size, ARCH_MEMREMAP_PMEM);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) 	return PTR_ERR_OR_ZERO(nsio->addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) void devm_nsio_disable(struct device *dev, struct nd_namespace_io *nsio)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) 	struct resource *res = &nsio->res;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) 	devm_memunmap(dev, nsio->addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) 	devm_exit_badblocks(dev, &nsio->bb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) 	devm_release_mem_region(dev, res->start, nsio->size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) }