mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-05 11:56:40 +07:00
6568b08b77
Track a set of dax_operations per dax_device that can be set at alloc_dax() time. These operations will be used to stop the abuse of block_device_operations for communicating dax capabilities to filesystems. It will also be used to replace the "pmem api" and move pmem-specific cache maintenance, and other dax-driver-specific filesystem-dax operations, to dax device methods. In particular this allows us to stop abusing __copy_user_nocache(), via memcpy_to_pmem(), with a driver specific replacement. This is a standalone introduction of the operations. Follow on patches convert each dax-driver and teach fs/dax.c to use ->direct_access() from dax_operations instead of block_device_operations. Suggested-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
714 lines
17 KiB
C
714 lines
17 KiB
C
/*
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* Copyright(c) 2016 - 2017 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.
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*/
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#include <linux/pagemap.h>
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#include <linux/module.h>
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#include <linux/device.h>
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#include <linux/pfn_t.h>
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#include <linux/cdev.h>
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#include <linux/slab.h>
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#include <linux/dax.h>
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#include <linux/fs.h>
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#include <linux/mm.h>
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#include "dax.h"
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static struct class *dax_class;
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/**
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* struct dax_region - mapping infrastructure for dax devices
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* @id: kernel-wide unique region for a memory range
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* @base: linear address corresponding to @res
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* @kref: to pin while other agents have a need to do lookups
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* @dev: parent device backing this region
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* @align: allocation and mapping alignment for child dax devices
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* @res: physical address range of the region
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* @pfn_flags: identify whether the pfns are paged back or not
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*/
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struct dax_region {
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int id;
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struct ida ida;
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void *base;
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struct kref kref;
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struct device *dev;
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unsigned int align;
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struct resource res;
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unsigned long pfn_flags;
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};
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/**
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* struct dev_dax - instance data for a subdivision of a dax region
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* @region - parent region
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* @dax_dev - core dax functionality
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* @dev - device core
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* @id - child id in the region
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* @num_resources - number of physical address extents in this device
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* @res - array of physical address ranges
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*/
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struct dev_dax {
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struct dax_region *region;
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struct dax_device *dax_dev;
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struct device dev;
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int id;
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int num_resources;
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struct resource res[0];
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};
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static ssize_t id_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct dax_region *dax_region;
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ssize_t rc = -ENXIO;
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device_lock(dev);
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dax_region = dev_get_drvdata(dev);
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if (dax_region)
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rc = sprintf(buf, "%d\n", dax_region->id);
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device_unlock(dev);
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return rc;
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}
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static DEVICE_ATTR_RO(id);
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static ssize_t region_size_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct dax_region *dax_region;
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ssize_t rc = -ENXIO;
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device_lock(dev);
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dax_region = dev_get_drvdata(dev);
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if (dax_region)
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rc = sprintf(buf, "%llu\n", (unsigned long long)
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resource_size(&dax_region->res));
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device_unlock(dev);
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return rc;
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}
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static struct device_attribute dev_attr_region_size = __ATTR(size, 0444,
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region_size_show, NULL);
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static ssize_t align_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct dax_region *dax_region;
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ssize_t rc = -ENXIO;
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device_lock(dev);
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dax_region = dev_get_drvdata(dev);
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if (dax_region)
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rc = sprintf(buf, "%u\n", dax_region->align);
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device_unlock(dev);
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return rc;
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}
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static DEVICE_ATTR_RO(align);
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static struct attribute *dax_region_attributes[] = {
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&dev_attr_region_size.attr,
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&dev_attr_align.attr,
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&dev_attr_id.attr,
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NULL,
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};
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static const struct attribute_group dax_region_attribute_group = {
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.name = "dax_region",
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.attrs = dax_region_attributes,
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};
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static const struct attribute_group *dax_region_attribute_groups[] = {
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&dax_region_attribute_group,
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NULL,
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};
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static void dax_region_free(struct kref *kref)
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{
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struct dax_region *dax_region;
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dax_region = container_of(kref, struct dax_region, kref);
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kfree(dax_region);
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}
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void dax_region_put(struct dax_region *dax_region)
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{
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kref_put(&dax_region->kref, dax_region_free);
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}
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EXPORT_SYMBOL_GPL(dax_region_put);
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static void dax_region_unregister(void *region)
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{
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struct dax_region *dax_region = region;
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sysfs_remove_groups(&dax_region->dev->kobj,
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dax_region_attribute_groups);
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dax_region_put(dax_region);
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}
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struct dax_region *alloc_dax_region(struct device *parent, int region_id,
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struct resource *res, unsigned int align, void *addr,
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unsigned long pfn_flags)
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{
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struct dax_region *dax_region;
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/*
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* The DAX core assumes that it can store its private data in
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* parent->driver_data. This WARN is a reminder / safeguard for
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* developers of device-dax drivers.
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*/
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if (dev_get_drvdata(parent)) {
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dev_WARN(parent, "dax core failed to setup private data\n");
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return NULL;
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}
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if (!IS_ALIGNED(res->start, align)
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|| !IS_ALIGNED(resource_size(res), align))
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return NULL;
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dax_region = kzalloc(sizeof(*dax_region), GFP_KERNEL);
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if (!dax_region)
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return NULL;
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dev_set_drvdata(parent, dax_region);
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memcpy(&dax_region->res, res, sizeof(*res));
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dax_region->pfn_flags = pfn_flags;
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kref_init(&dax_region->kref);
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dax_region->id = region_id;
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ida_init(&dax_region->ida);
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dax_region->align = align;
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dax_region->dev = parent;
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dax_region->base = addr;
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if (sysfs_create_groups(&parent->kobj, dax_region_attribute_groups)) {
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kfree(dax_region);
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return NULL;;
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}
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kref_get(&dax_region->kref);
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if (devm_add_action_or_reset(parent, dax_region_unregister, dax_region))
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return NULL;
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return dax_region;
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}
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EXPORT_SYMBOL_GPL(alloc_dax_region);
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static struct dev_dax *to_dev_dax(struct device *dev)
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{
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return container_of(dev, struct dev_dax, dev);
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}
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static ssize_t size_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct dev_dax *dev_dax = to_dev_dax(dev);
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unsigned long long size = 0;
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int i;
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for (i = 0; i < dev_dax->num_resources; i++)
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size += resource_size(&dev_dax->res[i]);
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return sprintf(buf, "%llu\n", size);
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}
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static DEVICE_ATTR_RO(size);
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static struct attribute *dev_dax_attributes[] = {
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&dev_attr_size.attr,
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NULL,
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};
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static const struct attribute_group dev_dax_attribute_group = {
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.attrs = dev_dax_attributes,
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};
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static const struct attribute_group *dax_attribute_groups[] = {
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&dev_dax_attribute_group,
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NULL,
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};
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static int check_vma(struct dev_dax *dev_dax, struct vm_area_struct *vma,
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const char *func)
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{
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struct dax_region *dax_region = dev_dax->region;
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struct device *dev = &dev_dax->dev;
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unsigned long mask;
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if (!dax_alive(dev_dax->dax_dev))
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return -ENXIO;
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/* prevent private mappings from being established */
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if ((vma->vm_flags & VM_MAYSHARE) != VM_MAYSHARE) {
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dev_info(dev, "%s: %s: fail, attempted private mapping\n",
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current->comm, func);
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return -EINVAL;
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}
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mask = dax_region->align - 1;
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if (vma->vm_start & mask || vma->vm_end & mask) {
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dev_info(dev, "%s: %s: fail, unaligned vma (%#lx - %#lx, %#lx)\n",
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current->comm, func, vma->vm_start, vma->vm_end,
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mask);
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return -EINVAL;
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}
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if ((dax_region->pfn_flags & (PFN_DEV|PFN_MAP)) == PFN_DEV
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&& (vma->vm_flags & VM_DONTCOPY) == 0) {
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dev_info(dev, "%s: %s: fail, dax range requires MADV_DONTFORK\n",
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current->comm, func);
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return -EINVAL;
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}
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if (!vma_is_dax(vma)) {
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dev_info(dev, "%s: %s: fail, vma is not DAX capable\n",
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current->comm, func);
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return -EINVAL;
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}
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return 0;
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}
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static phys_addr_t pgoff_to_phys(struct dev_dax *dev_dax, pgoff_t pgoff,
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unsigned long size)
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{
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struct resource *res;
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phys_addr_t phys;
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int i;
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for (i = 0; i < dev_dax->num_resources; i++) {
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res = &dev_dax->res[i];
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phys = pgoff * PAGE_SIZE + res->start;
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if (phys >= res->start && phys <= res->end)
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break;
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pgoff -= PHYS_PFN(resource_size(res));
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}
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if (i < dev_dax->num_resources) {
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res = &dev_dax->res[i];
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if (phys + size - 1 <= res->end)
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return phys;
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}
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return -1;
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}
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static int __dev_dax_pte_fault(struct dev_dax *dev_dax, struct vm_fault *vmf)
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{
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struct device *dev = &dev_dax->dev;
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struct dax_region *dax_region;
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int rc = VM_FAULT_SIGBUS;
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phys_addr_t phys;
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pfn_t pfn;
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unsigned int fault_size = PAGE_SIZE;
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if (check_vma(dev_dax, vmf->vma, __func__))
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return VM_FAULT_SIGBUS;
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dax_region = dev_dax->region;
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if (dax_region->align > PAGE_SIZE) {
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dev_dbg(dev, "%s: alignment (%#x) > fault size (%#x)\n",
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__func__, dax_region->align, fault_size);
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return VM_FAULT_SIGBUS;
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}
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if (fault_size != dax_region->align)
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return VM_FAULT_SIGBUS;
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phys = pgoff_to_phys(dev_dax, vmf->pgoff, PAGE_SIZE);
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if (phys == -1) {
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dev_dbg(dev, "%s: pgoff_to_phys(%#lx) failed\n", __func__,
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vmf->pgoff);
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return VM_FAULT_SIGBUS;
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}
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pfn = phys_to_pfn_t(phys, dax_region->pfn_flags);
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rc = vm_insert_mixed(vmf->vma, vmf->address, pfn);
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if (rc == -ENOMEM)
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return VM_FAULT_OOM;
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if (rc < 0 && rc != -EBUSY)
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return VM_FAULT_SIGBUS;
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return VM_FAULT_NOPAGE;
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}
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static int __dev_dax_pmd_fault(struct dev_dax *dev_dax, struct vm_fault *vmf)
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{
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unsigned long pmd_addr = vmf->address & PMD_MASK;
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struct device *dev = &dev_dax->dev;
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struct dax_region *dax_region;
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phys_addr_t phys;
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pgoff_t pgoff;
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pfn_t pfn;
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unsigned int fault_size = PMD_SIZE;
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if (check_vma(dev_dax, vmf->vma, __func__))
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return VM_FAULT_SIGBUS;
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dax_region = dev_dax->region;
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if (dax_region->align > PMD_SIZE) {
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dev_dbg(dev, "%s: alignment (%#x) > fault size (%#x)\n",
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__func__, dax_region->align, fault_size);
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return VM_FAULT_SIGBUS;
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}
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/* dax pmd mappings require pfn_t_devmap() */
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if ((dax_region->pfn_flags & (PFN_DEV|PFN_MAP)) != (PFN_DEV|PFN_MAP)) {
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dev_dbg(dev, "%s: region lacks devmap flags\n", __func__);
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return VM_FAULT_SIGBUS;
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}
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if (fault_size < dax_region->align)
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return VM_FAULT_SIGBUS;
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else if (fault_size > dax_region->align)
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return VM_FAULT_FALLBACK;
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/* if we are outside of the VMA */
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if (pmd_addr < vmf->vma->vm_start ||
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(pmd_addr + PMD_SIZE) > vmf->vma->vm_end)
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return VM_FAULT_SIGBUS;
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pgoff = linear_page_index(vmf->vma, pmd_addr);
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phys = pgoff_to_phys(dev_dax, pgoff, PMD_SIZE);
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if (phys == -1) {
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dev_dbg(dev, "%s: pgoff_to_phys(%#lx) failed\n", __func__,
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pgoff);
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return VM_FAULT_SIGBUS;
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}
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pfn = phys_to_pfn_t(phys, dax_region->pfn_flags);
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return vmf_insert_pfn_pmd(vmf->vma, vmf->address, vmf->pmd, pfn,
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vmf->flags & FAULT_FLAG_WRITE);
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}
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#ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD
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static int __dev_dax_pud_fault(struct dev_dax *dev_dax, struct vm_fault *vmf)
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{
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unsigned long pud_addr = vmf->address & PUD_MASK;
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struct device *dev = &dev_dax->dev;
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struct dax_region *dax_region;
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phys_addr_t phys;
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pgoff_t pgoff;
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pfn_t pfn;
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unsigned int fault_size = PUD_SIZE;
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if (check_vma(dev_dax, vmf->vma, __func__))
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return VM_FAULT_SIGBUS;
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dax_region = dev_dax->region;
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if (dax_region->align > PUD_SIZE) {
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dev_dbg(dev, "%s: alignment (%#x) > fault size (%#x)\n",
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__func__, dax_region->align, fault_size);
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return VM_FAULT_SIGBUS;
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}
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/* dax pud mappings require pfn_t_devmap() */
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if ((dax_region->pfn_flags & (PFN_DEV|PFN_MAP)) != (PFN_DEV|PFN_MAP)) {
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dev_dbg(dev, "%s: region lacks devmap flags\n", __func__);
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return VM_FAULT_SIGBUS;
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}
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if (fault_size < dax_region->align)
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return VM_FAULT_SIGBUS;
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else if (fault_size > dax_region->align)
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return VM_FAULT_FALLBACK;
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/* if we are outside of the VMA */
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if (pud_addr < vmf->vma->vm_start ||
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(pud_addr + PUD_SIZE) > vmf->vma->vm_end)
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return VM_FAULT_SIGBUS;
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pgoff = linear_page_index(vmf->vma, pud_addr);
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phys = pgoff_to_phys(dev_dax, pgoff, PUD_SIZE);
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if (phys == -1) {
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dev_dbg(dev, "%s: pgoff_to_phys(%#lx) failed\n", __func__,
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pgoff);
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return VM_FAULT_SIGBUS;
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}
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pfn = phys_to_pfn_t(phys, dax_region->pfn_flags);
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return vmf_insert_pfn_pud(vmf->vma, vmf->address, vmf->pud, pfn,
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vmf->flags & FAULT_FLAG_WRITE);
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}
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#else
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static int __dev_dax_pud_fault(struct dev_dax *dev_dax, struct vm_fault *vmf)
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{
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return VM_FAULT_FALLBACK;
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}
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#endif /* !CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD */
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static int dev_dax_huge_fault(struct vm_fault *vmf,
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enum page_entry_size pe_size)
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{
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int rc, id;
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struct file *filp = vmf->vma->vm_file;
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struct dev_dax *dev_dax = filp->private_data;
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dev_dbg(&dev_dax->dev, "%s: %s: %s (%#lx - %#lx) size = %d\n", __func__,
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current->comm, (vmf->flags & FAULT_FLAG_WRITE)
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? "write" : "read",
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vmf->vma->vm_start, vmf->vma->vm_end, pe_size);
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id = dax_read_lock();
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switch (pe_size) {
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case PE_SIZE_PTE:
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rc = __dev_dax_pte_fault(dev_dax, vmf);
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break;
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case PE_SIZE_PMD:
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rc = __dev_dax_pmd_fault(dev_dax, vmf);
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break;
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case PE_SIZE_PUD:
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rc = __dev_dax_pud_fault(dev_dax, vmf);
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break;
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default:
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rc = VM_FAULT_SIGBUS;
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}
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dax_read_unlock(id);
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return rc;
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}
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static int dev_dax_fault(struct vm_fault *vmf)
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{
|
|
return dev_dax_huge_fault(vmf, PE_SIZE_PTE);
|
|
}
|
|
|
|
static const struct vm_operations_struct dax_vm_ops = {
|
|
.fault = dev_dax_fault,
|
|
.huge_fault = dev_dax_huge_fault,
|
|
};
|
|
|
|
static int dax_mmap(struct file *filp, struct vm_area_struct *vma)
|
|
{
|
|
struct dev_dax *dev_dax = filp->private_data;
|
|
int rc, id;
|
|
|
|
dev_dbg(&dev_dax->dev, "%s\n", __func__);
|
|
|
|
/*
|
|
* We lock to check dax_dev liveness and will re-check at
|
|
* fault time.
|
|
*/
|
|
id = dax_read_lock();
|
|
rc = check_vma(dev_dax, vma, __func__);
|
|
dax_read_unlock(id);
|
|
if (rc)
|
|
return rc;
|
|
|
|
vma->vm_ops = &dax_vm_ops;
|
|
vma->vm_flags |= VM_MIXEDMAP | VM_HUGEPAGE;
|
|
return 0;
|
|
}
|
|
|
|
/* return an unmapped area aligned to the dax region specified alignment */
|
|
static unsigned long dax_get_unmapped_area(struct file *filp,
|
|
unsigned long addr, unsigned long len, unsigned long pgoff,
|
|
unsigned long flags)
|
|
{
|
|
unsigned long off, off_end, off_align, len_align, addr_align, align;
|
|
struct dev_dax *dev_dax = filp ? filp->private_data : NULL;
|
|
struct dax_region *dax_region;
|
|
|
|
if (!dev_dax || addr)
|
|
goto out;
|
|
|
|
dax_region = dev_dax->region;
|
|
align = dax_region->align;
|
|
off = pgoff << PAGE_SHIFT;
|
|
off_end = off + len;
|
|
off_align = round_up(off, align);
|
|
|
|
if ((off_end <= off_align) || ((off_end - off_align) < align))
|
|
goto out;
|
|
|
|
len_align = len + align;
|
|
if ((off + len_align) < off)
|
|
goto out;
|
|
|
|
addr_align = current->mm->get_unmapped_area(filp, addr, len_align,
|
|
pgoff, flags);
|
|
if (!IS_ERR_VALUE(addr_align)) {
|
|
addr_align += (off - addr_align) & (align - 1);
|
|
return addr_align;
|
|
}
|
|
out:
|
|
return current->mm->get_unmapped_area(filp, addr, len, pgoff, flags);
|
|
}
|
|
|
|
static int dax_open(struct inode *inode, struct file *filp)
|
|
{
|
|
struct dax_device *dax_dev = inode_dax(inode);
|
|
struct inode *__dax_inode = dax_inode(dax_dev);
|
|
struct dev_dax *dev_dax = dax_get_private(dax_dev);
|
|
|
|
dev_dbg(&dev_dax->dev, "%s\n", __func__);
|
|
inode->i_mapping = __dax_inode->i_mapping;
|
|
inode->i_mapping->host = __dax_inode;
|
|
filp->f_mapping = inode->i_mapping;
|
|
filp->private_data = dev_dax;
|
|
inode->i_flags = S_DAX;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int dax_release(struct inode *inode, struct file *filp)
|
|
{
|
|
struct dev_dax *dev_dax = filp->private_data;
|
|
|
|
dev_dbg(&dev_dax->dev, "%s\n", __func__);
|
|
return 0;
|
|
}
|
|
|
|
static const struct file_operations dax_fops = {
|
|
.llseek = noop_llseek,
|
|
.owner = THIS_MODULE,
|
|
.open = dax_open,
|
|
.release = dax_release,
|
|
.get_unmapped_area = dax_get_unmapped_area,
|
|
.mmap = dax_mmap,
|
|
};
|
|
|
|
static void dev_dax_release(struct device *dev)
|
|
{
|
|
struct dev_dax *dev_dax = to_dev_dax(dev);
|
|
struct dax_region *dax_region = dev_dax->region;
|
|
struct dax_device *dax_dev = dev_dax->dax_dev;
|
|
|
|
ida_simple_remove(&dax_region->ida, dev_dax->id);
|
|
dax_region_put(dax_region);
|
|
put_dax(dax_dev);
|
|
kfree(dev_dax);
|
|
}
|
|
|
|
static void kill_dev_dax(struct dev_dax *dev_dax)
|
|
{
|
|
struct dax_device *dax_dev = dev_dax->dax_dev;
|
|
struct inode *inode = dax_inode(dax_dev);
|
|
|
|
kill_dax(dax_dev);
|
|
unmap_mapping_range(inode->i_mapping, 0, 0, 1);
|
|
}
|
|
|
|
static void unregister_dev_dax(void *dev)
|
|
{
|
|
struct dev_dax *dev_dax = to_dev_dax(dev);
|
|
struct dax_device *dax_dev = dev_dax->dax_dev;
|
|
struct inode *inode = dax_inode(dax_dev);
|
|
struct cdev *cdev = inode->i_cdev;
|
|
|
|
dev_dbg(dev, "%s\n", __func__);
|
|
|
|
kill_dev_dax(dev_dax);
|
|
cdev_device_del(cdev, dev);
|
|
put_device(dev);
|
|
}
|
|
|
|
struct dev_dax *devm_create_dev_dax(struct dax_region *dax_region,
|
|
struct resource *res, int count)
|
|
{
|
|
struct device *parent = dax_region->dev;
|
|
struct dax_device *dax_dev;
|
|
struct dev_dax *dev_dax;
|
|
struct inode *inode;
|
|
struct device *dev;
|
|
struct cdev *cdev;
|
|
int rc = 0, i;
|
|
|
|
dev_dax = kzalloc(sizeof(*dev_dax) + sizeof(*res) * count, GFP_KERNEL);
|
|
if (!dev_dax)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
for (i = 0; i < count; i++) {
|
|
if (!IS_ALIGNED(res[i].start, dax_region->align)
|
|
|| !IS_ALIGNED(resource_size(&res[i]),
|
|
dax_region->align)) {
|
|
rc = -EINVAL;
|
|
break;
|
|
}
|
|
dev_dax->res[i].start = res[i].start;
|
|
dev_dax->res[i].end = res[i].end;
|
|
}
|
|
|
|
if (i < count)
|
|
goto err_id;
|
|
|
|
dev_dax->id = ida_simple_get(&dax_region->ida, 0, 0, GFP_KERNEL);
|
|
if (dev_dax->id < 0) {
|
|
rc = dev_dax->id;
|
|
goto err_id;
|
|
}
|
|
|
|
/*
|
|
* No 'host' or dax_operations since there is no access to this
|
|
* device outside of mmap of the resulting character device.
|
|
*/
|
|
dax_dev = alloc_dax(dev_dax, NULL, NULL);
|
|
if (!dax_dev)
|
|
goto err_dax;
|
|
|
|
/* from here on we're committed to teardown via dax_dev_release() */
|
|
dev = &dev_dax->dev;
|
|
device_initialize(dev);
|
|
|
|
inode = dax_inode(dax_dev);
|
|
cdev = inode->i_cdev;
|
|
cdev_init(cdev, &dax_fops);
|
|
cdev->owner = parent->driver->owner;
|
|
|
|
dev_dax->num_resources = count;
|
|
dev_dax->dax_dev = dax_dev;
|
|
dev_dax->region = dax_region;
|
|
kref_get(&dax_region->kref);
|
|
|
|
dev->devt = inode->i_rdev;
|
|
dev->class = dax_class;
|
|
dev->parent = parent;
|
|
dev->groups = dax_attribute_groups;
|
|
dev->release = dev_dax_release;
|
|
dev_set_name(dev, "dax%d.%d", dax_region->id, dev_dax->id);
|
|
|
|
rc = cdev_device_add(cdev, dev);
|
|
if (rc) {
|
|
kill_dev_dax(dev_dax);
|
|
put_device(dev);
|
|
return ERR_PTR(rc);
|
|
}
|
|
|
|
rc = devm_add_action_or_reset(dax_region->dev, unregister_dev_dax, dev);
|
|
if (rc)
|
|
return ERR_PTR(rc);
|
|
|
|
return dev_dax;
|
|
|
|
err_dax:
|
|
ida_simple_remove(&dax_region->ida, dev_dax->id);
|
|
err_id:
|
|
kfree(dev_dax);
|
|
|
|
return ERR_PTR(rc);
|
|
}
|
|
EXPORT_SYMBOL_GPL(devm_create_dev_dax);
|
|
|
|
static int __init dax_init(void)
|
|
{
|
|
dax_class = class_create(THIS_MODULE, "dax");
|
|
return PTR_ERR_OR_ZERO(dax_class);
|
|
}
|
|
|
|
static void __exit dax_exit(void)
|
|
{
|
|
class_destroy(dax_class);
|
|
}
|
|
|
|
MODULE_AUTHOR("Intel Corporation");
|
|
MODULE_LICENSE("GPL v2");
|
|
subsys_initcall(dax_init);
|
|
module_exit(dax_exit);
|