/* SPDX-License-Identifier: GPL-2.0-or-later */ /* * lppaca.h * Copyright (C) 2001 Mike Corrigan IBM Corporation
*/ #ifndef _ASM_POWERPC_LPPACA_H #define _ASM_POWERPC_LPPACA_H
#ifdef __KERNEL__
/* * These definitions relate to hypervisors that only exist when using * a server type processor
*/ #ifdef CONFIG_PPC_BOOK3S
/* * This control block contains the data that is shared between the * hypervisor and the OS.
*/ #include <linux/cache.h> #include <linux/threads.h> #include <asm/types.h> #include <asm/mmu.h> #include <asm/firmware.h> #include <asm/paca.h>
/* * The lppaca is the "virtual processor area" registered with the hypervisor, * H_REGISTER_VPA etc. * * According to PAPR, the structure is 640 bytes long, must be L1 cache line * aligned, and must not cross a 4kB boundary. Its size field must be at * least 640 bytes (but may be more). * * Pre-v4.14 KVM hypervisors reject the VPA if its size field is smaller than * 1kB, so we dynamically allocate 1kB and advertise size as 1kB, but keep * this structure as the canonical 640 byte size.
*/ struct lppaca { /* cacheline 1 contains read-only data */
__be32 desc; /* Eye catcher 0xD397D781 */
__be16 size; /* Size of this struct */
u8 reserved1[3];
u8 __old_status; /* Old status, including shared proc */
u8 reserved3[14]; volatile __be32 dyn_hw_node_id; /* Dynamic hardware node id */ volatile __be32 dyn_hw_proc_id; /* Dynamic hardware proc id */
u8 reserved4[56]; volatile u8 vphn_assoc_counts[8]; /* Virtual processor home node */ /* associativity change counters */
u8 reserved5[32];
/* cacheline 2 contains local read-write data */
u8 reserved6[48];
u8 cede_latency_hint;
u8 ebb_regs_in_use;
u8 reserved7[6];
u8 dtl_enable_mask; /* Dispatch Trace Log mask */
u8 donate_dedicated_cpu; /* Donate dedicated CPU cycles */
u8 fpregs_in_use;
u8 pmcregs_in_use;
u8 l2_counters_enable; /* Enable usage of counters for KVM guest */
u8 reserved8[27];
__be64 wait_state_cycles; /* Wait cycles for this proc */
u8 reserved9[28];
__be16 slb_count; /* # of SLBs to maintain */
u8 idle; /* Indicate OS is idle */
u8 vmxregs_in_use;
/* cacheline 3 is shared with other processors */
/* * This is the yield_count. An "odd" value (low bit on) means that * the processor is yielded (either because of an OS yield or a * hypervisor preempt). An even value implies that the processor is * currently executing. * NOTE: Even dedicated processor partitions can yield so this * field cannot be used to determine if we are shared or dedicated.
*/ volatile __be32 yield_count; volatile __be32 dispersion_count; /* dispatch changed physical cpu */ volatile __be64 cmo_faults; /* CMO page fault count */ volatile __be64 cmo_fault_time; /* CMO page fault time */
u8 reserved10[64]; /* [S]PURR expropriated/donated */ volatile __be64 enqueue_dispatch_tb; /* Total TB enqueue->dispatch */ volatile __be64 ready_enqueue_tb; /* Total TB ready->enqueue */ volatile __be64 wait_ready_tb; /* Total TB wait->ready */
u8 reserved11[16];
/* cacheline 4-5 */
__be32 page_ins; /* CMO Hint - # page ins by OS */
u8 reserved12[28]; volatile __be64 l1_to_l2_cs_tb; volatile __be64 l2_to_l1_cs_tb; volatile __be64 l2_runtime_tb;
u8 reserved13[96]; volatile __be64 dtl_idx; /* Dispatch Trace Log head index */
u8 reserved14[96];
} ____cacheline_aligned;
/* * We are using a non architected field to determine if a partition is * shared or dedicated. This currently works on both KVM and PHYP, but * we will have to transition to something better.
*/ #define LPPACA_OLD_SHARED_PROC 2
#ifdef CONFIG_PPC_PSERIES /* * All CPUs should have the same shared proc value, so directly access the PACA * to avoid false positives from DEBUG_PREEMPT.
*/ staticinlinebool lppaca_shared_proc(void)
{ struct lppaca *l = local_paca->lppaca_ptr;
if (!firmware_has_feature(FW_FEATURE_SPLPAR)) returnfalse; return !!(l->__old_status & LPPACA_OLD_SHARED_PROC);
}
/* * SLB shadow buffer structure as defined in the PAPR. The save_area * contains adjacent ESID and VSID pairs for each shadowed SLB. The * ESID is stored in the lower 64bits, then the VSID.
*/ struct slb_shadow {
__be32 persistent; /* Number of persistent SLBs */
__be32 buffer_length; /* Total shadow buffer length */
__be64 reserved; struct {
__be64 esid;
__be64 vsid;
} save_area[SLB_NUM_BOLTED];
} ____cacheline_aligned;
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