11a59d1b8SThomas Gleixner /* SPDX-License-Identifier: GPL-2.0-or-later */
2b8b572e1SStephen Rothwell /*
3b8b572e1SStephen Rothwell * lppaca.h
4b8b572e1SStephen Rothwell * Copyright (C) 2001 Mike Corrigan IBM Corporation
5b8b572e1SStephen Rothwell */
6b8b572e1SStephen Rothwell #ifndef _ASM_POWERPC_LPPACA_H
7b8b572e1SStephen Rothwell #define _ASM_POWERPC_LPPACA_H
85a1ea477SNaveen N. Rao
9b8b572e1SStephen Rothwell #ifdef __KERNEL__
10b8b572e1SStephen Rothwell
1159c19cb2SAnton Blanchard /*
1259c19cb2SAnton Blanchard * These definitions relate to hypervisors that only exist when using
1394491685SBenjamin Herrenschmidt * a server type processor
1494491685SBenjamin Herrenschmidt */
1594491685SBenjamin Herrenschmidt #ifdef CONFIG_PPC_BOOK3S
1694491685SBenjamin Herrenschmidt
1759c19cb2SAnton Blanchard /*
1859c19cb2SAnton Blanchard * This control block contains the data that is shared between the
1959c19cb2SAnton Blanchard * hypervisor and the OS.
2059c19cb2SAnton Blanchard */
21b8b572e1SStephen Rothwell #include <linux/cache.h>
22f2f6dad6SBenjamin Herrenschmidt #include <linux/threads.h>
23b8b572e1SStephen Rothwell #include <asm/types.h>
24b8b572e1SStephen Rothwell #include <asm/mmu.h>
25a6201da3SAneesh Kumar K.V #include <asm/firmware.h>
26eac030b2SRussell Currey #include <asm/paca.h>
27b8b572e1SStephen Rothwell
28f2f6dad6SBenjamin Herrenschmidt /*
29499dcd41SNicholas Piggin * The lppaca is the "virtual processor area" registered with the hypervisor,
30499dcd41SNicholas Piggin * H_REGISTER_VPA etc.
31499dcd41SNicholas Piggin *
32499dcd41SNicholas Piggin * According to PAPR, the structure is 640 bytes long, must be L1 cache line
33499dcd41SNicholas Piggin * aligned, and must not cross a 4kB boundary. Its size field must be at
34499dcd41SNicholas Piggin * least 640 bytes (but may be more).
35499dcd41SNicholas Piggin *
36499dcd41SNicholas Piggin * Pre-v4.14 KVM hypervisors reject the VPA if its size field is smaller than
37499dcd41SNicholas Piggin * 1kB, so we dynamically allocate 1kB and advertise size as 1kB, but keep
38499dcd41SNicholas Piggin * this structure as the canonical 640 byte size.
3959c19cb2SAnton Blanchard */
40b8b572e1SStephen Rothwell struct lppaca {
4159c19cb2SAnton Blanchard /* cacheline 1 contains read-only data */
42b8b572e1SStephen Rothwell
43c72cd555SAnton Blanchard __be32 desc; /* Eye catcher 0xD397D781 */
44c72cd555SAnton Blanchard __be16 size; /* Size of this struct */
45f13c13a0SAnton Blanchard u8 reserved1[3];
46f13c13a0SAnton Blanchard u8 __old_status; /* Old status, including shared proc */
4759c19cb2SAnton Blanchard u8 reserved3[14];
48c72cd555SAnton Blanchard volatile __be32 dyn_hw_node_id; /* Dynamic hardware node id */
49c72cd555SAnton Blanchard volatile __be32 dyn_hw_proc_id; /* Dynamic hardware proc id */
5059c19cb2SAnton Blanchard u8 reserved4[56];
5159c19cb2SAnton Blanchard volatile u8 vphn_assoc_counts[8]; /* Virtual processor home node */
5259c19cb2SAnton Blanchard /* associativity change counters */
5359c19cb2SAnton Blanchard u8 reserved5[32];
54b8b572e1SStephen Rothwell
5559c19cb2SAnton Blanchard /* cacheline 2 contains local read-write data */
56b8b572e1SStephen Rothwell
5759c19cb2SAnton Blanchard u8 reserved6[48];
5859c19cb2SAnton Blanchard u8 cede_latency_hint;
596e0b8bc9SMichael Ellerman u8 ebb_regs_in_use;
606e0b8bc9SMichael Ellerman u8 reserved7[6];
6159c19cb2SAnton Blanchard u8 dtl_enable_mask; /* Dispatch Trace Log mask */
6259c19cb2SAnton Blanchard u8 donate_dedicated_cpu; /* Donate dedicated CPU cycles */
6359c19cb2SAnton Blanchard u8 fpregs_in_use;
6459c19cb2SAnton Blanchard u8 pmcregs_in_use;
65*e1f288d2SGautam Menghani u8 l2_counters_enable; /* Enable usage of counters for KVM guest */
66*e1f288d2SGautam Menghani u8 reserved8[27];
67c72cd555SAnton Blanchard __be64 wait_state_cycles; /* Wait cycles for this proc */
6859c19cb2SAnton Blanchard u8 reserved9[28];
69c72cd555SAnton Blanchard __be16 slb_count; /* # of SLBs to maintain */
7059c19cb2SAnton Blanchard u8 idle; /* Indicate OS is idle */
7159c19cb2SAnton Blanchard u8 vmxregs_in_use;
72b8b572e1SStephen Rothwell
7359c19cb2SAnton Blanchard /* cacheline 3 is shared with other processors */
7459c19cb2SAnton Blanchard
7559c19cb2SAnton Blanchard /*
7659c19cb2SAnton Blanchard * This is the yield_count. An "odd" value (low bit on) means that
7759c19cb2SAnton Blanchard * the processor is yielded (either because of an OS yield or a
7859c19cb2SAnton Blanchard * hypervisor preempt). An even value implies that the processor is
7959c19cb2SAnton Blanchard * currently executing.
80733187e2SAnton Blanchard * NOTE: Even dedicated processor partitions can yield so this
81733187e2SAnton Blanchard * field cannot be used to determine if we are shared or dedicated.
8259c19cb2SAnton Blanchard */
83c72cd555SAnton Blanchard volatile __be32 yield_count;
84c72cd555SAnton Blanchard volatile __be32 dispersion_count; /* dispatch changed physical cpu */
85c72cd555SAnton Blanchard volatile __be64 cmo_faults; /* CMO page fault count */
86c72cd555SAnton Blanchard volatile __be64 cmo_fault_time; /* CMO page fault time */
87a8933c8dSNicholas Piggin u8 reserved10[64]; /* [S]PURR expropriated/donated */
88a8933c8dSNicholas Piggin volatile __be64 enqueue_dispatch_tb; /* Total TB enqueue->dispatch */
89a8933c8dSNicholas Piggin volatile __be64 ready_enqueue_tb; /* Total TB ready->enqueue */
90a8933c8dSNicholas Piggin volatile __be64 wait_ready_tb; /* Total TB wait->ready */
91a8933c8dSNicholas Piggin u8 reserved11[16];
9259c19cb2SAnton Blanchard
9359c19cb2SAnton Blanchard /* cacheline 4-5 */
9459c19cb2SAnton Blanchard
95c72cd555SAnton Blanchard __be32 page_ins; /* CMO Hint - # page ins by OS */
96*e1f288d2SGautam Menghani u8 reserved12[28];
97*e1f288d2SGautam Menghani volatile __be64 l1_to_l2_cs_tb;
98*e1f288d2SGautam Menghani volatile __be64 l2_to_l1_cs_tb;
99*e1f288d2SGautam Menghani volatile __be64 l2_runtime_tb;
100a8933c8dSNicholas Piggin u8 reserved13[96];
101*e1f288d2SGautam Menghani volatile __be64 dtl_idx; /* Dispatch Trace Log head index */
102*e1f288d2SGautam Menghani u8 reserved14[96];
103499dcd41SNicholas Piggin } ____cacheline_aligned;
104b8b572e1SStephen Rothwell
105d2e60075SNicholas Piggin #define lppaca_of(cpu) (*paca_ptrs[cpu]->lppaca_ptr)
1068154c5d2SPaul Mackerras
107b8b572e1SStephen Rothwell /*
108733187e2SAnton Blanchard * We are using a non architected field to determine if a partition is
109733187e2SAnton Blanchard * shared or dedicated. This currently works on both KVM and PHYP, but
110733187e2SAnton Blanchard * we will have to transition to something better.
111f13c13a0SAnton Blanchard */
112f13c13a0SAnton Blanchard #define LPPACA_OLD_SHARED_PROC 2
113f13c13a0SAnton Blanchard
114eac030b2SRussell Currey #ifdef CONFIG_PPC_PSERIES
115eac030b2SRussell Currey /*
116eac030b2SRussell Currey * All CPUs should have the same shared proc value, so directly access the PACA
117eac030b2SRussell Currey * to avoid false positives from DEBUG_PREEMPT.
118eac030b2SRussell Currey */
lppaca_shared_proc(void)119eac030b2SRussell Currey static inline bool lppaca_shared_proc(void)
120f13c13a0SAnton Blanchard {
121eac030b2SRussell Currey struct lppaca *l = local_paca->lppaca_ptr;
122eac030b2SRussell Currey
123a6201da3SAneesh Kumar K.V if (!firmware_has_feature(FW_FEATURE_SPLPAR))
124a6201da3SAneesh Kumar K.V return false;
125733187e2SAnton Blanchard return !!(l->__old_status & LPPACA_OLD_SHARED_PROC);
126f13c13a0SAnton Blanchard }
127f13c13a0SAnton Blanchard
1281aa00066SMichael Ellerman #define get_lppaca() (get_paca()->lppaca_ptr)
1291aa00066SMichael Ellerman #endif
1301aa00066SMichael Ellerman
131f13c13a0SAnton Blanchard /*
132b8b572e1SStephen Rothwell * SLB shadow buffer structure as defined in the PAPR. The save_area
133b8b572e1SStephen Rothwell * contains adjacent ESID and VSID pairs for each shadowed SLB. The
134b8b572e1SStephen Rothwell * ESID is stored in the lower 64bits, then the VSID.
135b8b572e1SStephen Rothwell */
136b8b572e1SStephen Rothwell struct slb_shadow {
137c72cd555SAnton Blanchard __be32 persistent; /* Number of persistent SLBs */
138c72cd555SAnton Blanchard __be32 buffer_length; /* Total shadow buffer length */
139c72cd555SAnton Blanchard __be64 reserved;
140b8b572e1SStephen Rothwell struct {
141c72cd555SAnton Blanchard __be64 esid;
142c72cd555SAnton Blanchard __be64 vsid;
14359c19cb2SAnton Blanchard } save_area[SLB_NUM_BOLTED];
144b8b572e1SStephen Rothwell } ____cacheline_aligned;
145b8b572e1SStephen Rothwell
14694491685SBenjamin Herrenschmidt #endif /* CONFIG_PPC_BOOK3S */
147b8b572e1SStephen Rothwell #endif /* __KERNEL__ */
148b8b572e1SStephen Rothwell #endif /* _ASM_POWERPC_LPPACA_H */
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