mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-19 22:36:49 +07:00
c5d4355d10
This patch adds functionality to perform flush from guest to host over VIRTIO. We are registering a callback based on 'nd_region' type. virtio_pmem driver requires this special flush function. For rest of the region types we are registering existing flush function. Report error returned by host fsync failure to userspace. Signed-off-by: Pankaj Gupta <pagupta@redhat.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
337 lines
7.7 KiB
C
337 lines
7.7 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright(c) 2013-2015 Intel Corporation. All rights reserved.
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*/
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#include <linux/device.h>
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#include <linux/sizes.h>
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#include "nd-core.h"
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#include "pmem.h"
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#include "pfn.h"
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#include "btt.h"
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#include "nd.h"
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void __nd_detach_ndns(struct device *dev, struct nd_namespace_common **_ndns)
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{
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struct nd_namespace_common *ndns = *_ndns;
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struct nvdimm_bus *nvdimm_bus;
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if (!ndns)
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return;
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nvdimm_bus = walk_to_nvdimm_bus(&ndns->dev);
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lockdep_assert_held(&nvdimm_bus->reconfig_mutex);
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dev_WARN_ONCE(dev, ndns->claim != dev, "%s: invalid claim\n", __func__);
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ndns->claim = NULL;
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*_ndns = NULL;
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put_device(&ndns->dev);
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}
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void nd_detach_ndns(struct device *dev,
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struct nd_namespace_common **_ndns)
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{
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struct nd_namespace_common *ndns = *_ndns;
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if (!ndns)
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return;
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get_device(&ndns->dev);
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nvdimm_bus_lock(&ndns->dev);
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__nd_detach_ndns(dev, _ndns);
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nvdimm_bus_unlock(&ndns->dev);
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put_device(&ndns->dev);
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}
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bool __nd_attach_ndns(struct device *dev, struct nd_namespace_common *attach,
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struct nd_namespace_common **_ndns)
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{
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struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(&attach->dev);
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if (attach->claim)
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return false;
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lockdep_assert_held(&nvdimm_bus->reconfig_mutex);
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dev_WARN_ONCE(dev, *_ndns, "%s: invalid claim\n", __func__);
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attach->claim = dev;
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*_ndns = attach;
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get_device(&attach->dev);
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return true;
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}
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bool nd_attach_ndns(struct device *dev, struct nd_namespace_common *attach,
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struct nd_namespace_common **_ndns)
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{
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bool claimed;
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nvdimm_bus_lock(&attach->dev);
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claimed = __nd_attach_ndns(dev, attach, _ndns);
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nvdimm_bus_unlock(&attach->dev);
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return claimed;
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}
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static int namespace_match(struct device *dev, void *data)
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{
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char *name = data;
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return strcmp(name, dev_name(dev)) == 0;
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}
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static bool is_idle(struct device *dev, struct nd_namespace_common *ndns)
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{
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struct nd_region *nd_region = to_nd_region(dev->parent);
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struct device *seed = NULL;
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if (is_nd_btt(dev))
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seed = nd_region->btt_seed;
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else if (is_nd_pfn(dev))
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seed = nd_region->pfn_seed;
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else if (is_nd_dax(dev))
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seed = nd_region->dax_seed;
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if (seed == dev || ndns || dev->driver)
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return false;
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return true;
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}
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struct nd_pfn *to_nd_pfn_safe(struct device *dev)
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{
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/*
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* pfn device attributes are re-used by dax device instances, so we
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* need to be careful to correct device-to-nd_pfn conversion.
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*/
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if (is_nd_pfn(dev))
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return to_nd_pfn(dev);
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if (is_nd_dax(dev)) {
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struct nd_dax *nd_dax = to_nd_dax(dev);
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return &nd_dax->nd_pfn;
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}
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WARN_ON(1);
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return NULL;
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}
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static void nd_detach_and_reset(struct device *dev,
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struct nd_namespace_common **_ndns)
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{
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/* detach the namespace and destroy / reset the device */
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__nd_detach_ndns(dev, _ndns);
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if (is_idle(dev, *_ndns)) {
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nd_device_unregister(dev, ND_ASYNC);
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} else if (is_nd_btt(dev)) {
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struct nd_btt *nd_btt = to_nd_btt(dev);
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nd_btt->lbasize = 0;
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kfree(nd_btt->uuid);
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nd_btt->uuid = NULL;
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} else if (is_nd_pfn(dev) || is_nd_dax(dev)) {
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struct nd_pfn *nd_pfn = to_nd_pfn_safe(dev);
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kfree(nd_pfn->uuid);
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nd_pfn->uuid = NULL;
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nd_pfn->mode = PFN_MODE_NONE;
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}
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}
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ssize_t nd_namespace_store(struct device *dev,
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struct nd_namespace_common **_ndns, const char *buf,
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size_t len)
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{
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struct nd_namespace_common *ndns;
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struct device *found;
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char *name;
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if (dev->driver) {
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dev_dbg(dev, "namespace already active\n");
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return -EBUSY;
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}
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name = kstrndup(buf, len, GFP_KERNEL);
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if (!name)
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return -ENOMEM;
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strim(name);
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if (strncmp(name, "namespace", 9) == 0 || strcmp(name, "") == 0)
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/* pass */;
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else {
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len = -EINVAL;
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goto out;
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}
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ndns = *_ndns;
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if (strcmp(name, "") == 0) {
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nd_detach_and_reset(dev, _ndns);
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goto out;
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} else if (ndns) {
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dev_dbg(dev, "namespace already set to: %s\n",
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dev_name(&ndns->dev));
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len = -EBUSY;
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goto out;
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}
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found = device_find_child(dev->parent, name, namespace_match);
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if (!found) {
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dev_dbg(dev, "'%s' not found under %s\n", name,
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dev_name(dev->parent));
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len = -ENODEV;
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goto out;
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}
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ndns = to_ndns(found);
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switch (ndns->claim_class) {
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case NVDIMM_CCLASS_NONE:
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break;
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case NVDIMM_CCLASS_BTT:
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case NVDIMM_CCLASS_BTT2:
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if (!is_nd_btt(dev)) {
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len = -EBUSY;
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goto out_attach;
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}
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break;
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case NVDIMM_CCLASS_PFN:
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if (!is_nd_pfn(dev)) {
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len = -EBUSY;
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goto out_attach;
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}
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break;
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case NVDIMM_CCLASS_DAX:
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if (!is_nd_dax(dev)) {
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len = -EBUSY;
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goto out_attach;
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}
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break;
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default:
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len = -EBUSY;
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goto out_attach;
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break;
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}
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if (__nvdimm_namespace_capacity(ndns) < SZ_16M) {
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dev_dbg(dev, "%s too small to host\n", name);
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len = -ENXIO;
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goto out_attach;
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}
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WARN_ON_ONCE(!is_nvdimm_bus_locked(dev));
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if (!__nd_attach_ndns(dev, ndns, _ndns)) {
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dev_dbg(dev, "%s already claimed\n",
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dev_name(&ndns->dev));
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len = -EBUSY;
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}
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out_attach:
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put_device(&ndns->dev); /* from device_find_child */
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out:
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kfree(name);
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return len;
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}
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/*
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* nd_sb_checksum: compute checksum for a generic info block
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*
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* Returns a fletcher64 checksum of everything in the given info block
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* except the last field (since that's where the checksum lives).
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*/
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u64 nd_sb_checksum(struct nd_gen_sb *nd_gen_sb)
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{
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u64 sum;
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__le64 sum_save;
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BUILD_BUG_ON(sizeof(struct btt_sb) != SZ_4K);
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BUILD_BUG_ON(sizeof(struct nd_pfn_sb) != SZ_4K);
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BUILD_BUG_ON(sizeof(struct nd_gen_sb) != SZ_4K);
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sum_save = nd_gen_sb->checksum;
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nd_gen_sb->checksum = 0;
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sum = nd_fletcher64(nd_gen_sb, sizeof(*nd_gen_sb), 1);
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nd_gen_sb->checksum = sum_save;
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return sum;
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}
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EXPORT_SYMBOL(nd_sb_checksum);
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static int nsio_rw_bytes(struct nd_namespace_common *ndns,
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resource_size_t offset, void *buf, size_t size, int rw,
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unsigned long flags)
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{
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struct nd_namespace_io *nsio = to_nd_namespace_io(&ndns->dev);
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unsigned int sz_align = ALIGN(size + (offset & (512 - 1)), 512);
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sector_t sector = offset >> 9;
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int rc = 0, ret = 0;
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if (unlikely(!size))
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return 0;
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if (unlikely(offset + size > nsio->size)) {
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dev_WARN_ONCE(&ndns->dev, 1, "request out of range\n");
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return -EFAULT;
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}
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if (rw == READ) {
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if (unlikely(is_bad_pmem(&nsio->bb, sector, sz_align)))
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return -EIO;
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if (memcpy_mcsafe(buf, nsio->addr + offset, size) != 0)
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return -EIO;
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return 0;
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}
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if (unlikely(is_bad_pmem(&nsio->bb, sector, sz_align))) {
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if (IS_ALIGNED(offset, 512) && IS_ALIGNED(size, 512)
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&& !(flags & NVDIMM_IO_ATOMIC)) {
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long cleared;
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might_sleep();
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cleared = nvdimm_clear_poison(&ndns->dev,
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nsio->res.start + offset, size);
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if (cleared < size)
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rc = -EIO;
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if (cleared > 0 && cleared / 512) {
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cleared /= 512;
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badblocks_clear(&nsio->bb, sector, cleared);
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}
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arch_invalidate_pmem(nsio->addr + offset, size);
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} else
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rc = -EIO;
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}
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memcpy_flushcache(nsio->addr + offset, buf, size);
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ret = nvdimm_flush(to_nd_region(ndns->dev.parent), NULL);
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if (ret)
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rc = ret;
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return rc;
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}
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int devm_nsio_enable(struct device *dev, struct nd_namespace_io *nsio)
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{
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struct resource *res = &nsio->res;
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struct nd_namespace_common *ndns = &nsio->common;
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nsio->size = resource_size(res);
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if (!devm_request_mem_region(dev, res->start, resource_size(res),
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dev_name(&ndns->dev))) {
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dev_warn(dev, "could not reserve region %pR\n", res);
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return -EBUSY;
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}
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ndns->rw_bytes = nsio_rw_bytes;
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if (devm_init_badblocks(dev, &nsio->bb))
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return -ENOMEM;
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nvdimm_badblocks_populate(to_nd_region(ndns->dev.parent), &nsio->bb,
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&nsio->res);
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nsio->addr = devm_memremap(dev, res->start, resource_size(res),
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ARCH_MEMREMAP_PMEM);
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return PTR_ERR_OR_ZERO(nsio->addr);
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}
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EXPORT_SYMBOL_GPL(devm_nsio_enable);
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void devm_nsio_disable(struct device *dev, struct nd_namespace_io *nsio)
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{
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struct resource *res = &nsio->res;
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devm_memunmap(dev, nsio->addr);
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devm_exit_badblocks(dev, &nsio->bb);
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devm_release_mem_region(dev, res->start, resource_size(res));
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}
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EXPORT_SYMBOL_GPL(devm_nsio_disable);
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