From 8e0b634b132752ec3eba50afb952502b1a87d6ba Mon Sep 17 00:00:00 2001 From: Nicholas Piggin Date: Wed, 14 Feb 2018 01:08:11 +1000 Subject: [PATCH] powerpc/64s: Do not allocate lppaca if we are not virtualized The "lppaca" is a structure registered with the hypervisor. This is unnecessary when running on non-virtualised platforms. One field from the lppaca (pmcregs_in_use) is also used by the host, so move the host part out into the paca (lppaca field is still updated in guest mode). Signed-off-by: Nicholas Piggin [mpe: Fix non-pseries build with some #ifdefs] Signed-off-by: Michael Ellerman --- arch/powerpc/include/asm/paca.h | 12 ++++++++++-- arch/powerpc/include/asm/plpar_wrappers.h | 4 ++++ arch/powerpc/include/asm/pmc.h | 13 ++++++++++++- arch/powerpc/kernel/asm-offsets.c | 5 +++++ arch/powerpc/kernel/paca.c | 16 +++++++++++++--- arch/powerpc/kvm/book3s_hv_interrupts.S | 3 +-- arch/powerpc/kvm/book3s_hv_rmhandlers.S | 3 +-- 7 files changed, 46 insertions(+), 10 deletions(-) diff --git a/arch/powerpc/include/asm/paca.h b/arch/powerpc/include/asm/paca.h index b62c31037cad..6db5ab2a29a3 100644 --- a/arch/powerpc/include/asm/paca.h +++ b/arch/powerpc/include/asm/paca.h @@ -46,7 +46,10 @@ extern unsigned int debug_smp_processor_id(void); /* from linux/smp.h */ #define get_paca() local_paca #endif +#ifdef CONFIG_PPC_PSERIES #define get_lppaca() (get_paca()->lppaca_ptr) +#endif + #define get_slb_shadow() (get_paca()->slb_shadow_ptr) struct task_struct; @@ -58,7 +61,7 @@ struct task_struct; * processor. */ struct paca_struct { -#ifdef CONFIG_PPC_BOOK3S +#ifdef CONFIG_PPC_PSERIES /* * Because hw_cpu_id, unlike other paca fields, is accessed * routinely from other CPUs (from the IRQ code), we stick to @@ -67,7 +70,8 @@ struct paca_struct { */ struct lppaca *lppaca_ptr; /* Pointer to LpPaca for PLIC */ -#endif /* CONFIG_PPC_BOOK3S */ +#endif /* CONFIG_PPC_PSERIES */ + /* * MAGIC: the spinlock functions in arch/powerpc/lib/locks.c * load lock_token and paca_index with a single lwz @@ -160,10 +164,14 @@ struct paca_struct { u64 saved_msr; /* MSR saved here by enter_rtas */ u16 trap_save; /* Used when bad stack is encountered */ u8 irq_soft_mask; /* mask for irq soft masking */ + u8 soft_enabled; /* irq soft-enable flag */ u8 irq_happened; /* irq happened while soft-disabled */ u8 io_sync; /* writel() needs spin_unlock sync */ u8 irq_work_pending; /* IRQ_WORK interrupt while soft-disable */ u8 nap_state_lost; /* NV GPR values lost in power7_idle */ +#ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE + u8 pmcregs_in_use; /* pseries puts this in lppaca */ +#endif u64 sprg_vdso; /* Saved user-visible sprg */ #ifdef CONFIG_PPC_TRANSACTIONAL_MEM u64 tm_scratch; /* TM scratch area for reclaim */ diff --git a/arch/powerpc/include/asm/plpar_wrappers.h b/arch/powerpc/include/asm/plpar_wrappers.h index 55eddf50d149..540785d01f96 100644 --- a/arch/powerpc/include/asm/plpar_wrappers.h +++ b/arch/powerpc/include/asm/plpar_wrappers.h @@ -2,6 +2,8 @@ #ifndef _ASM_POWERPC_PLPAR_WRAPPERS_H #define _ASM_POWERPC_PLPAR_WRAPPERS_H +#ifdef CONFIG_PPC_PSERIES + #include #include @@ -340,4 +342,6 @@ static inline long plpar_get_cpu_characteristics(struct h_cpu_char_result *p) return rc; } +#endif /* CONFIG_PPC_PSERIES */ + #endif /* _ASM_POWERPC_PLPAR_WRAPPERS_H */ diff --git a/arch/powerpc/include/asm/pmc.h b/arch/powerpc/include/asm/pmc.h index 5a9ede4962cb..7ac3586c38ab 100644 --- a/arch/powerpc/include/asm/pmc.h +++ b/arch/powerpc/include/asm/pmc.h @@ -31,10 +31,21 @@ void ppc_enable_pmcs(void); #ifdef CONFIG_PPC_BOOK3S_64 #include +#include static inline void ppc_set_pmu_inuse(int inuse) { - get_lppaca()->pmcregs_in_use = inuse; +#if defined(CONFIG_PPC_PSERIES) || defined(CONFIG_KVM_BOOK3S_HV_POSSIBLE) + if (firmware_has_feature(FW_FEATURE_LPAR)) { +#ifdef CONFIG_PPC_PSERIES + get_lppaca()->pmcregs_in_use = inuse; +#endif + } else { +#ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE + get_paca()->pmcregs_in_use = inuse; +#endif + } +#endif } extern void power4_enable_pmcs(void); diff --git a/arch/powerpc/kernel/asm-offsets.c b/arch/powerpc/kernel/asm-offsets.c index ea5eb91b836e..bbde55f408c7 100644 --- a/arch/powerpc/kernel/asm-offsets.c +++ b/arch/powerpc/kernel/asm-offsets.c @@ -221,12 +221,17 @@ int main(void) OFFSET(PACA_EXMC, paca_struct, exmc); OFFSET(PACA_EXSLB, paca_struct, exslb); OFFSET(PACA_EXNMI, paca_struct, exnmi); +#ifdef CONFIG_PPC_PSERIES OFFSET(PACALPPACAPTR, paca_struct, lppaca_ptr); +#endif OFFSET(PACA_SLBSHADOWPTR, paca_struct, slb_shadow_ptr); OFFSET(SLBSHADOW_STACKVSID, slb_shadow, save_area[SLB_NUM_BOLTED - 1].vsid); OFFSET(SLBSHADOW_STACKESID, slb_shadow, save_area[SLB_NUM_BOLTED - 1].esid); OFFSET(SLBSHADOW_SAVEAREA, slb_shadow, save_area); OFFSET(LPPACA_PMCINUSE, lppaca, pmcregs_in_use); +#ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE + OFFSET(PACA_PMCINUSE, paca_struct, pmcregs_in_use); +#endif OFFSET(LPPACA_DTLIDX, lppaca, dtl_idx); OFFSET(LPPACA_YIELDCOUNT, lppaca, yield_count); OFFSET(PACA_DTL_RIDX, paca_struct, dtl_ridx); diff --git a/arch/powerpc/kernel/paca.c b/arch/powerpc/kernel/paca.c index 95ffedf14885..5900540e2ff8 100644 --- a/arch/powerpc/kernel/paca.c +++ b/arch/powerpc/kernel/paca.c @@ -20,7 +20,7 @@ #include "setup.h" -#ifdef CONFIG_PPC_BOOK3S +#ifdef CONFIG_PPC_PSERIES /* * The structure which the hypervisor knows about - this structure @@ -47,6 +47,9 @@ static long __initdata lppaca_size; static void __init allocate_lppacas(int nr_cpus, unsigned long limit) { + if (early_cpu_has_feature(CPU_FTR_HVMODE)) + return; + if (nr_cpus <= NR_LPPACAS) return; @@ -60,6 +63,9 @@ static struct lppaca * __init new_lppaca(int cpu) { struct lppaca *lp; + if (early_cpu_has_feature(CPU_FTR_HVMODE)) + return NULL; + if (cpu < NR_LPPACAS) return &lppaca[cpu]; @@ -73,6 +79,9 @@ static void __init free_lppacas(void) { long new_size = 0, nr; + if (early_cpu_has_feature(CPU_FTR_HVMODE)) + return; + if (!lppaca_size) return; nr = num_possible_cpus() - NR_LPPACAS; @@ -157,9 +166,10 @@ EXPORT_SYMBOL(paca); void __init initialise_paca(struct paca_struct *new_paca, int cpu) { -#ifdef CONFIG_PPC_BOOK3S +#ifdef CONFIG_PPC_PSERIES new_paca->lppaca_ptr = new_lppaca(cpu); -#else +#endif +#ifdef CONFIG_PPC_BOOK3E new_paca->kernel_pgd = swapper_pg_dir; #endif new_paca->lock_token = 0x8000; diff --git a/arch/powerpc/kvm/book3s_hv_interrupts.S b/arch/powerpc/kvm/book3s_hv_interrupts.S index dc54373c8780..0e8493033288 100644 --- a/arch/powerpc/kvm/book3s_hv_interrupts.S +++ b/arch/powerpc/kvm/book3s_hv_interrupts.S @@ -79,8 +79,7 @@ END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S) li r5, 0 mtspr SPRN_MMCRA, r5 isync - ld r3, PACALPPACAPTR(r13) /* is the host using the PMU? */ - lbz r5, LPPACA_PMCINUSE(r3) + lbz r5, PACA_PMCINUSE(r13) /* is the host using the PMU? */ cmpwi r5, 0 beq 31f /* skip if not */ mfspr r5, SPRN_MMCR1 diff --git a/arch/powerpc/kvm/book3s_hv_rmhandlers.S b/arch/powerpc/kvm/book3s_hv_rmhandlers.S index f31f357b8c5a..a1c6ea26f568 100644 --- a/arch/powerpc/kvm/book3s_hv_rmhandlers.S +++ b/arch/powerpc/kvm/book3s_hv_rmhandlers.S @@ -113,8 +113,7 @@ END_FTR_SECTION_IFCLR(CPU_FTR_ARCH_207S) mtspr SPRN_SPRG_VDSO_WRITE,r3 /* Reload the host's PMU registers */ - ld r3, PACALPPACAPTR(r13) /* is the host using the PMU? */ - lbz r4, LPPACA_PMCINUSE(r3) + lbz r4, PACA_PMCINUSE(r13) /* is the host using the PMU? */ cmpwi r4, 0 beq 23f /* skip if not */ BEGIN_FTR_SECTION -- 2.30.2