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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
commit2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch)
tree848558de17fb3008cdf4d861b01ac7781903ce39 /arch/powerpc/include/asm/lppaca.h
parentInitial commit. (diff)
downloadlinux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz
linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip
Adding upstream version 6.1.76.upstream/6.1.76
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'arch/powerpc/include/asm/lppaca.h')
-rw-r--r--arch/powerpc/include/asm/lppaca.h167
1 files changed, 167 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/lppaca.h b/arch/powerpc/include/asm/lppaca.h
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+/* 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
+
+/*
+ * The below VPHN macros are outside the __KERNEL__ check since these are
+ * used for compiling the vphn selftest in userspace
+ */
+
+/* The H_HOME_NODE_ASSOCIATIVITY h_call returns 6 64-bit registers. */
+#define VPHN_REGISTER_COUNT 6
+
+/*
+ * 6 64-bit registers unpacked into up to 24 be32 associativity values. To
+ * form the complete property we have to add the length in the first cell.
+ */
+#define VPHN_ASSOC_BUFSIZE (VPHN_REGISTER_COUNT*sizeof(u64)/sizeof(u16) + 1)
+
+/*
+ * The H_HOME_NODE_ASSOCIATIVITY hcall takes two values for flags:
+ * 1 for retrieving associativity information for a guest cpu
+ * 2 for retrieving associativity information for a host/hypervisor cpu
+ */
+#define VPHN_FLAG_VCPU 1
+#define VPHN_FLAG_PCPU 2
+
+#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 reserved8[28];
+ __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[148];
+ volatile __be64 dtl_idx; /* Dispatch Trace Log head index */
+ u8 reserved13[96];
+} ____cacheline_aligned;
+
+#define lppaca_of(cpu) (*paca_ptrs[cpu]->lppaca_ptr)
+
+/*
+ * 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.
+ */
+static inline bool lppaca_shared_proc(void)
+{
+ struct lppaca *l = local_paca->lppaca_ptr;
+
+ if (!firmware_has_feature(FW_FEATURE_SPLPAR))
+ return false;
+ return !!(l->__old_status & LPPACA_OLD_SHARED_PROC);
+}
+
+#define get_lppaca() (get_paca()->lppaca_ptr)
+#endif
+
+/*
+ * 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;
+
+extern long hcall_vphn(unsigned long cpu, u64 flags, __be32 *associativity);
+
+#endif /* CONFIG_PPC_BOOK3S */
+#endif /* __KERNEL__ */
+#endif /* _ASM_POWERPC_LPPACA_H */