vphn/asm/lppaca.h

0001 /* SPDX-License-Identifier: GPL-2.0-or-later */
0002 /*
0003  * lppaca.h
0004  * Copyright (C) 2001  Mike Corrigan IBM Corporation
0005  */
0006 #ifndef _ASM_POWERPC_LPPACA_H
0007 #define _ASM_POWERPC_LPPACA_H
0008
0009 /*
0010  * The below VPHN macros are outside the __KERNEL__ check since these are
0011  * used for compiling the vphn selftest in userspace
0012  */
0013
0014 /* The H_HOME_NODE_ASSOCIATIVITY h_call returns 6 64-bit registers. */
0015 #define VPHN_REGISTER_COUNT 6
0016
0017 /*
0018  * 6 64-bit registers unpacked into up to 24 be32 associativity values. To
0019  * form the complete property we have to add the length in the first cell.
0020  */
0021 #define VPHN_ASSOC_BUFSIZE (VPHN_REGISTER_COUNT*sizeof(u64)/sizeof(u16) + 1)
0022
0023 /*
0024  * The H_HOME_NODE_ASSOCIATIVITY hcall takes two values for flags:
0025  * 1 for retrieving associativity information for a guest cpu
0026  * 2 for retrieving associativity information for a host/hypervisor cpu
0027  */
0028 #define VPHN_FLAG_VCPU  1
0029 #define VPHN_FLAG_PCPU  2
0030
0031 #ifdef __KERNEL__
0032
0033 /*
0034  * These definitions relate to hypervisors that only exist when using
0035  * a server type processor
0036  */
0037 #ifdef CONFIG_PPC_BOOK3S
0038
0039 /*
0040  * This control block contains the data that is shared between the
0041  * hypervisor and the OS.
0042  */
0043 #include <linux/cache.h>
0044 #include <linux/threads.h>
0045 #include <asm/types.h>
0046 #include <asm/mmu.h>
0047 #include <asm/firmware.h>
0048
0049 /*
0050  * The lppaca is the "virtual processor area" registered with the hypervisor,
0051  * H_REGISTER_VPA etc.
0052  *
0053  * According to PAPR, the structure is 640 bytes long, must be L1 cache line
0054  * aligned, and must not cross a 4kB boundary. Its size field must be at
0055  * least 640 bytes (but may be more).
0056  *
0057  * Pre-v4.14 KVM hypervisors reject the VPA if its size field is smaller than
0058  * 1kB, so we dynamically allocate 1kB and advertise size as 1kB, but keep
0059  * this structure as the canonical 640 byte size.
0060  */
0061 struct lppaca {
0062     /* cacheline 1 contains read-only data */
0063
0064     __be32  desc;           /* Eye catcher 0xD397D781 */
0065     __be16  size;           /* Size of this struct */
0066     u8  reserved1[3];
0067     u8  __old_status;       /* Old status, including shared proc */
0068     u8  reserved3[14];
0069     volatile __be32 dyn_hw_node_id; /* Dynamic hardware node id */
0070     volatile __be32 dyn_hw_proc_id; /* Dynamic hardware proc id */
0071     u8  reserved4[56];
0072     volatile u8 vphn_assoc_counts[8]; /* Virtual processor home node */
0073                       /* associativity change counters */
0074     u8  reserved5[32];
0075
0076     /* cacheline 2 contains local read-write data */
0077
0078     u8  reserved6[48];
0079     u8  cede_latency_hint;
0080     u8  ebb_regs_in_use;
0081     u8  reserved7[6];
0082     u8  dtl_enable_mask;    /* Dispatch Trace Log mask */
0083     u8  donate_dedicated_cpu;   /* Donate dedicated CPU cycles */
0084     u8  fpregs_in_use;
0085     u8  pmcregs_in_use;
0086     u8  reserved8[28];
0087     __be64  wait_state_cycles;  /* Wait cycles for this proc */
0088     u8  reserved9[28];
0089     __be16  slb_count;      /* # of SLBs to maintain */
0090     u8  idle;           /* Indicate OS is idle */
0091     u8  vmxregs_in_use;
0092
0093     /* cacheline 3 is shared with other processors */
0094
0095     /*
0096      * This is the yield_count.  An "odd" value (low bit on) means that
0097      * the processor is yielded (either because of an OS yield or a
0098      * hypervisor preempt).  An even value implies that the processor is
0099      * currently executing.
0100      * NOTE: Even dedicated processor partitions can yield so this
0101      * field cannot be used to determine if we are shared or dedicated.
0102      */
0103     volatile __be32 yield_count;
0104     volatile __be32 dispersion_count; /* dispatch changed physical cpu */
0105     volatile __be64 cmo_faults; /* CMO page fault count */
0106     volatile __be64 cmo_fault_time; /* CMO page fault time */
0107     u8  reserved10[104];
0108
0109     /* cacheline 4-5 */
0110
0111     __be32  page_ins;       /* CMO Hint - # page ins by OS */
0112     u8  reserved11[148];
0113     volatile __be64 dtl_idx;    /* Dispatch Trace Log head index */
0114     u8  reserved12[96];
0115 } ____cacheline_aligned;
0116
0117 #define lppaca_of(cpu)  (*paca_ptrs[cpu]->lppaca_ptr)
0118
0119 /*
0120  * We are using a non architected field to determine if a partition is
0121  * shared or dedicated. This currently works on both KVM and PHYP, but
0122  * we will have to transition to something better.
0123  */
0124 #define LPPACA_OLD_SHARED_PROC      2
0125
0126 static inline bool lppaca_shared_proc(struct lppaca *l)
0127 {
0128     if (!firmware_has_feature(FW_FEATURE_SPLPAR))
0129         return false;
0130     return !!(l->__old_status & LPPACA_OLD_SHARED_PROC);
0131 }
0132
0133 /*
0134  * SLB shadow buffer structure as defined in the PAPR.  The save_area
0135  * contains adjacent ESID and VSID pairs for each shadowed SLB.  The
0136  * ESID is stored in the lower 64bits, then the VSID.
0137  */
0138 struct slb_shadow {
0139     __be32  persistent;     /* Number of persistent SLBs */
0140     __be32  buffer_length;      /* Total shadow buffer length */
0141     __be64  reserved;
0142     struct  {
0143         __be64     esid;
0144         __be64  vsid;
0145     } save_area[SLB_NUM_BOLTED];
0146 } ____cacheline_aligned;
0147
0148 extern long hcall_vphn(unsigned long cpu, u64 flags, __be32 *associativity);
0149
0150 #endif /* CONFIG_PPC_BOOK3S */
0151 #endif /* __KERNEL__ */
0152 #endif /* _ASM_POWERPC_LPPACA_H */