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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vas.h (4059B)

      1/* SPDX-License-Identifier: GPL-2.0-or-later */
      2/*
      3 * Copyright 2020-21 IBM Corp.
      4 */
      5
      6#ifndef _VAS_H
      7#define _VAS_H
      8#include <asm/vas.h>
      9#include <linux/mutex.h>
     10#include <linux/stringify.h>
     11
     12/*
     13 * VAS window modify flags
     14 */
     15#define VAS_MOD_WIN_CLOSE	PPC_BIT(0)
     16#define VAS_MOD_WIN_JOBS_KILL	PPC_BIT(1)
     17#define VAS_MOD_WIN_DR		PPC_BIT(3)
     18#define VAS_MOD_WIN_PR		PPC_BIT(4)
     19#define VAS_MOD_WIN_SF		PPC_BIT(5)
     20#define VAS_MOD_WIN_TA		PPC_BIT(6)
     21#define VAS_MOD_WIN_FLAGS	(VAS_MOD_WIN_JOBS_KILL | VAS_MOD_WIN_DR | \
     22				VAS_MOD_WIN_PR | VAS_MOD_WIN_SF)
     23
     24#define VAS_WIN_ACTIVE		0x0
     25#define VAS_WIN_CLOSED		0x1
     26#define VAS_WIN_INACTIVE	0x2	/* Inactive due to HW failure */
     27/* Process of being modified, deallocated, or quiesced */
     28#define VAS_WIN_MOD_IN_PROCESS	0x3
     29
     30#define VAS_COPY_PASTE_USER_MODE	0x00000001
     31#define VAS_COP_OP_USER_MODE		0x00000010
     32
     33#define VAS_GZIP_QOS_CAPABILITIES	0x56516F73477A6970
     34#define VAS_GZIP_DEFAULT_CAPABILITIES	0x56446566477A6970
     35
     36enum vas_migrate_action {
     37	VAS_SUSPEND,
     38	VAS_RESUME,
     39};
     40
     41/*
     42 * Co-processor feature - GZIP QoS windows or GZIP default windows
     43 */
     44enum vas_cop_feat_type {
     45	VAS_GZIP_QOS_FEAT_TYPE,
     46	VAS_GZIP_DEF_FEAT_TYPE,
     47	VAS_MAX_FEAT_TYPE,
     48};
     49
     50/*
     51 * Use to get feature specific capabilities from the
     52 * hypervisor.
     53 */
     54struct hv_vas_cop_feat_caps {
     55	__be64	descriptor;
     56	u8	win_type;		/* Default or QoS type */
     57	u8	user_mode;
     58	__be16	max_lpar_creds;
     59	__be16	max_win_creds;
     60	union {
     61		__be16	reserved;
     62		__be16	def_lpar_creds; /* Used for default capabilities */
     63	};
     64	__be16	target_lpar_creds;
     65} __packed __aligned(0x1000);
     66
     67/*
     68 * Feature specific (QoS or default) capabilities.
     69 */
     70struct vas_cop_feat_caps {
     71	u64		descriptor;
     72	u8		win_type;	/* Default or QoS type */
     73	u8		user_mode;	/* User mode copy/paste or COP HCALL */
     74	u16		max_lpar_creds;	/* Max credits available in LPAR */
     75	/* Max credits can be assigned per window */
     76	u16		max_win_creds;
     77	union {
     78		u16	reserved;	/* Used for QoS credit type */
     79		u16	def_lpar_creds; /* Used for default credit type */
     80	};
     81	/* Total LPAR available credits. Can be different from max LPAR */
     82	/* credits due to DLPAR operation */
     83	atomic_t	nr_total_credits;	/* Total credits assigned to LPAR */
     84	atomic_t	nr_used_credits;	/* Used credits so far */
     85};
     86
     87/*
     88 * Feature (QoS or Default) specific to store capabilities and
     89 * the list of open windows.
     90 */
     91struct vas_caps {
     92	struct vas_cop_feat_caps caps;
     93	struct list_head list;	/* List of open windows */
     94	int nr_close_wins;	/* closed windows in the hypervisor for DLPAR */
     95	int nr_open_windows;	/* Number of successful open windows */
     96	u8 feat;		/* Feature type */
     97};
     98
     99/*
    100 * To get window information from the hypervisor.
    101 */
    102struct hv_vas_win_lpar {
    103	__be16	version;
    104	u8	win_type;
    105	u8	status;
    106	__be16	credits;	/* No of credits assigned to this window */
    107	__be16	reserved;
    108	__be32	pid;		/* LPAR Process ID */
    109	__be32	tid;		/* LPAR Thread ID */
    110	__be64	win_addr;	/* Paste address */
    111	__be32	interrupt;	/* Interrupt when NX request completes */
    112	__be32	fault;		/* Interrupt when NX sees fault */
    113	/* Associativity Domain Identifiers as returned in */
    114	/* H_HOME_NODE_ASSOCIATIVITY */
    115	__be64	domain[6];
    116	__be64	win_util;	/* Number of bytes processed */
    117} __packed __aligned(0x1000);
    118
    119struct pseries_vas_window {
    120	struct vas_window vas_win;
    121	u64 win_addr;		/* Physical paste address */
    122	u8 win_type;		/* QoS or Default window */
    123	u32 complete_irq;	/* Completion interrupt */
    124	u32 fault_irq;		/* Fault interrupt */
    125	u64 domain[6];		/* Associativity domain Ids */
    126				/* this window is allocated */
    127	u64 util;
    128	u32 pid;		/* PID associated with this window */
    129
    130	/* List of windows opened which is used for LPM */
    131	struct list_head win_list;
    132	u64 flags;
    133	char *name;
    134	int fault_virq;
    135};
    136
    137int sysfs_add_vas_caps(struct vas_cop_feat_caps *caps);
    138int vas_reconfig_capabilties(u8 type, int new_nr_creds);
    139int __init sysfs_pseries_vas_init(struct vas_all_caps *vas_caps);
    140
    141#ifdef CONFIG_PPC_VAS
    142int vas_migration_handler(int action);
    143#else
    144static inline int vas_migration_handler(int action)
    145{
    146	return 0;
    147}
    148#endif
    149#endif /* _VAS_H */