cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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dax-private.h (2907B)

      1/* SPDX-License-Identifier: GPL-2.0-only */
      2/*
      3 * Copyright(c) 2016 Intel Corporation. All rights reserved.
      4 */
      5#ifndef __DAX_PRIVATE_H__
      6#define __DAX_PRIVATE_H__
      7
      8#include <linux/device.h>
      9#include <linux/cdev.h>
     10#include <linux/idr.h>
     11
     12/* private routines between core files */
     13struct dax_device;
     14struct dax_device *inode_dax(struct inode *inode);
     15struct inode *dax_inode(struct dax_device *dax_dev);
     16int dax_bus_init(void);
     17void dax_bus_exit(void);
     18
     19/**
     20 * struct dax_region - mapping infrastructure for dax devices
     21 * @id: kernel-wide unique region for a memory range
     22 * @target_node: effective numa node if this memory range is onlined
     23 * @kref: to pin while other agents have a need to do lookups
     24 * @dev: parent device backing this region
     25 * @align: allocation and mapping alignment for child dax devices
     26 * @ida: instance id allocator
     27 * @res: resource tree to track instance allocations
     28 * @seed: allow userspace to find the first unbound seed device
     29 * @youngest: allow userspace to find the most recently created device
     30 */
     31struct dax_region {
     32	int id;
     33	int target_node;
     34	struct kref kref;
     35	struct device *dev;
     36	unsigned int align;
     37	struct ida ida;
     38	struct resource res;
     39	struct device *seed;
     40	struct device *youngest;
     41};
     42
     43struct dax_mapping {
     44	struct device dev;
     45	int range_id;
     46	int id;
     47};
     48
     49/**
     50 * struct dev_dax - instance data for a subdivision of a dax region, and
     51 * data while the device is activated in the driver.
     52 * @region - parent region
     53 * @dax_dev - core dax functionality
     54 * @target_node: effective numa node if dev_dax memory range is onlined
     55 * @id: ida allocated id
     56 * @ida: mapping id allocator
     57 * @dev - device core
     58 * @pgmap - pgmap for memmap setup / lifetime (driver owned)
     59 * @nr_range: size of @ranges
     60 * @ranges: resource-span + pgoff tuples for the instance
     61 */
     62struct dev_dax {
     63	struct dax_region *region;
     64	struct dax_device *dax_dev;
     65	unsigned int align;
     66	int target_node;
     67	int id;
     68	struct ida ida;
     69	struct device dev;
     70	struct dev_pagemap *pgmap;
     71	int nr_range;
     72	struct dev_dax_range {
     73		unsigned long pgoff;
     74		struct range range;
     75		struct dax_mapping *mapping;
     76	} *ranges;
     77};
     78
     79static inline struct dev_dax *to_dev_dax(struct device *dev)
     80{
     81	return container_of(dev, struct dev_dax, dev);
     82}
     83
     84static inline struct dax_mapping *to_dax_mapping(struct device *dev)
     85{
     86	return container_of(dev, struct dax_mapping, dev);
     87}
     88
     89phys_addr_t dax_pgoff_to_phys(struct dev_dax *dev_dax, pgoff_t pgoff, unsigned long size);
     90
     91#ifdef CONFIG_TRANSPARENT_HUGEPAGE
     92static inline bool dax_align_valid(unsigned long align)
     93{
     94	if (align == PUD_SIZE && IS_ENABLED(CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD))
     95		return true;
     96	if (align == PMD_SIZE && has_transparent_hugepage())
     97		return true;
     98	if (align == PAGE_SIZE)
     99		return true;
    100	return false;
    101}
    102#else
    103static inline bool dax_align_valid(unsigned long align)
    104{
    105	return align == PAGE_SIZE;
    106}
    107#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
    108#endif