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-rw-r--r--arch/powerpc/include/asm/mmu_context.h303
1 files changed, 303 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/mmu_context.h b/arch/powerpc/include/asm/mmu_context.h
new file mode 100644
index 000000000..c1ea270bb
--- /dev/null
+++ b/arch/powerpc/include/asm/mmu_context.h
@@ -0,0 +1,303 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __ASM_POWERPC_MMU_CONTEXT_H
+#define __ASM_POWERPC_MMU_CONTEXT_H
+#ifdef __KERNEL__
+
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/sched.h>
+#include <linux/spinlock.h>
+#include <asm/mmu.h>
+#include <asm/cputable.h>
+#include <asm/cputhreads.h>
+
+/*
+ * Most if the context management is out of line
+ */
+#define init_new_context init_new_context
+extern int init_new_context(struct task_struct *tsk, struct mm_struct *mm);
+#define destroy_context destroy_context
+extern void destroy_context(struct mm_struct *mm);
+#ifdef CONFIG_SPAPR_TCE_IOMMU
+struct mm_iommu_table_group_mem_t;
+
+extern bool mm_iommu_preregistered(struct mm_struct *mm);
+extern long mm_iommu_new(struct mm_struct *mm,
+ unsigned long ua, unsigned long entries,
+ struct mm_iommu_table_group_mem_t **pmem);
+extern long mm_iommu_newdev(struct mm_struct *mm, unsigned long ua,
+ unsigned long entries, unsigned long dev_hpa,
+ struct mm_iommu_table_group_mem_t **pmem);
+extern long mm_iommu_put(struct mm_struct *mm,
+ struct mm_iommu_table_group_mem_t *mem);
+extern void mm_iommu_init(struct mm_struct *mm);
+extern struct mm_iommu_table_group_mem_t *mm_iommu_lookup(struct mm_struct *mm,
+ unsigned long ua, unsigned long size);
+extern struct mm_iommu_table_group_mem_t *mm_iommu_get(struct mm_struct *mm,
+ unsigned long ua, unsigned long entries);
+extern long mm_iommu_ua_to_hpa(struct mm_iommu_table_group_mem_t *mem,
+ unsigned long ua, unsigned int pageshift, unsigned long *hpa);
+extern bool mm_iommu_is_devmem(struct mm_struct *mm, unsigned long hpa,
+ unsigned int pageshift, unsigned long *size);
+extern long mm_iommu_mapped_inc(struct mm_iommu_table_group_mem_t *mem);
+extern void mm_iommu_mapped_dec(struct mm_iommu_table_group_mem_t *mem);
+#else
+static inline bool mm_iommu_is_devmem(struct mm_struct *mm, unsigned long hpa,
+ unsigned int pageshift, unsigned long *size)
+{
+ return false;
+}
+static inline void mm_iommu_init(struct mm_struct *mm) { }
+#endif
+extern void switch_slb(struct task_struct *tsk, struct mm_struct *mm);
+
+#ifdef CONFIG_PPC_BOOK3S_64
+extern void radix__switch_mmu_context(struct mm_struct *prev,
+ struct mm_struct *next);
+static inline void switch_mmu_context(struct mm_struct *prev,
+ struct mm_struct *next,
+ struct task_struct *tsk)
+{
+ if (radix_enabled())
+ return radix__switch_mmu_context(prev, next);
+ return switch_slb(tsk, next);
+}
+
+extern int hash__alloc_context_id(void);
+void __init hash__reserve_context_id(int id);
+extern void __destroy_context(int context_id);
+static inline void mmu_context_init(void) { }
+
+#ifdef CONFIG_PPC_64S_HASH_MMU
+static inline int alloc_extended_context(struct mm_struct *mm,
+ unsigned long ea)
+{
+ int context_id;
+
+ int index = ea >> MAX_EA_BITS_PER_CONTEXT;
+
+ context_id = hash__alloc_context_id();
+ if (context_id < 0)
+ return context_id;
+
+ VM_WARN_ON(mm->context.extended_id[index]);
+ mm->context.extended_id[index] = context_id;
+ return context_id;
+}
+
+static inline bool need_extra_context(struct mm_struct *mm, unsigned long ea)
+{
+ int context_id;
+
+ context_id = get_user_context(&mm->context, ea);
+ if (!context_id)
+ return true;
+ return false;
+}
+#endif
+
+#else
+extern void switch_mmu_context(struct mm_struct *prev, struct mm_struct *next,
+ struct task_struct *tsk);
+extern unsigned long __init_new_context(void);
+extern void __destroy_context(unsigned long context_id);
+extern void mmu_context_init(void);
+static inline int alloc_extended_context(struct mm_struct *mm,
+ unsigned long ea)
+{
+ /* non book3s_64 should never find this called */
+ WARN_ON(1);
+ return -ENOMEM;
+}
+
+static inline bool need_extra_context(struct mm_struct *mm, unsigned long ea)
+{
+ return false;
+}
+#endif
+
+extern int use_cop(unsigned long acop, struct mm_struct *mm);
+extern void drop_cop(unsigned long acop, struct mm_struct *mm);
+
+#ifdef CONFIG_PPC_BOOK3S_64
+static inline void inc_mm_active_cpus(struct mm_struct *mm)
+{
+ atomic_inc(&mm->context.active_cpus);
+}
+
+static inline void dec_mm_active_cpus(struct mm_struct *mm)
+{
+ atomic_dec(&mm->context.active_cpus);
+}
+
+static inline void mm_context_add_copro(struct mm_struct *mm)
+{
+ /*
+ * If any copro is in use, increment the active CPU count
+ * in order to force TLB invalidations to be global as to
+ * propagate to the Nest MMU.
+ */
+ if (atomic_inc_return(&mm->context.copros) == 1)
+ inc_mm_active_cpus(mm);
+}
+
+static inline void mm_context_remove_copro(struct mm_struct *mm)
+{
+ int c;
+
+ /*
+ * When removing the last copro, we need to broadcast a global
+ * flush of the full mm, as the next TLBI may be local and the
+ * nMMU and/or PSL need to be cleaned up.
+ *
+ * Both the 'copros' and 'active_cpus' counts are looked at in
+ * flush_all_mm() to determine the scope (local/global) of the
+ * TLBIs, so we need to flush first before decrementing
+ * 'copros'. If this API is used by several callers for the
+ * same context, it can lead to over-flushing. It's hopefully
+ * not common enough to be a problem.
+ *
+ * Skip on hash, as we don't know how to do the proper flush
+ * for the time being. Invalidations will remain global if
+ * used on hash. Note that we can't drop 'copros' either, as
+ * it could make some invalidations local with no flush
+ * in-between.
+ */
+ if (radix_enabled()) {
+ flush_all_mm(mm);
+
+ c = atomic_dec_if_positive(&mm->context.copros);
+ /* Detect imbalance between add and remove */
+ WARN_ON(c < 0);
+
+ if (c == 0)
+ dec_mm_active_cpus(mm);
+ }
+}
+
+/*
+ * vas_windows counter shows number of open windows in the mm
+ * context. During context switch, use this counter to clear the
+ * foreign real address mapping (CP_ABORT) for the thread / process
+ * that intend to use COPY/PASTE. When a process closes all windows,
+ * disable CP_ABORT which is expensive to run.
+ *
+ * For user context, register a copro so that TLBIs are seen by the
+ * nest MMU. mm_context_add/remove_vas_window() are used only for user
+ * space windows.
+ */
+static inline void mm_context_add_vas_window(struct mm_struct *mm)
+{
+ atomic_inc(&mm->context.vas_windows);
+ mm_context_add_copro(mm);
+}
+
+static inline void mm_context_remove_vas_window(struct mm_struct *mm)
+{
+ int v;
+
+ mm_context_remove_copro(mm);
+ v = atomic_dec_if_positive(&mm->context.vas_windows);
+
+ /* Detect imbalance between add and remove */
+ WARN_ON(v < 0);
+}
+#else
+static inline void inc_mm_active_cpus(struct mm_struct *mm) { }
+static inline void dec_mm_active_cpus(struct mm_struct *mm) { }
+static inline void mm_context_add_copro(struct mm_struct *mm) { }
+static inline void mm_context_remove_copro(struct mm_struct *mm) { }
+#endif
+
+#if defined(CONFIG_KVM_BOOK3S_HV_POSSIBLE) && defined(CONFIG_PPC_RADIX_MMU)
+void do_h_rpt_invalidate_prt(unsigned long pid, unsigned long lpid,
+ unsigned long type, unsigned long pg_sizes,
+ unsigned long start, unsigned long end);
+#else
+static inline void do_h_rpt_invalidate_prt(unsigned long pid,
+ unsigned long lpid,
+ unsigned long type,
+ unsigned long pg_sizes,
+ unsigned long start,
+ unsigned long end) { }
+#endif
+
+extern void switch_mm_irqs_off(struct mm_struct *prev, struct mm_struct *next,
+ struct task_struct *tsk);
+
+static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
+ struct task_struct *tsk)
+{
+ unsigned long flags;
+
+ local_irq_save(flags);
+ switch_mm_irqs_off(prev, next, tsk);
+ local_irq_restore(flags);
+}
+#define switch_mm_irqs_off switch_mm_irqs_off
+
+/*
+ * After we have set current->mm to a new value, this activates
+ * the context for the new mm so we see the new mappings.
+ */
+#define activate_mm activate_mm
+static inline void activate_mm(struct mm_struct *prev, struct mm_struct *next)
+{
+ switch_mm_irqs_off(prev, next, current);
+}
+
+/* We don't currently use enter_lazy_tlb() for anything */
+#ifdef CONFIG_PPC_BOOK3E_64
+#define enter_lazy_tlb enter_lazy_tlb
+static inline void enter_lazy_tlb(struct mm_struct *mm,
+ struct task_struct *tsk)
+{
+ /* 64-bit Book3E keeps track of current PGD in the PACA */
+ get_paca()->pgd = NULL;
+}
+#endif
+
+extern void arch_exit_mmap(struct mm_struct *mm);
+
+static inline void arch_unmap(struct mm_struct *mm,
+ unsigned long start, unsigned long end)
+{
+ unsigned long vdso_base = (unsigned long)mm->context.vdso;
+
+ if (start <= vdso_base && vdso_base < end)
+ mm->context.vdso = NULL;
+}
+
+#ifdef CONFIG_PPC_MEM_KEYS
+bool arch_vma_access_permitted(struct vm_area_struct *vma, bool write,
+ bool execute, bool foreign);
+void arch_dup_pkeys(struct mm_struct *oldmm, struct mm_struct *mm);
+#else /* CONFIG_PPC_MEM_KEYS */
+static inline bool arch_vma_access_permitted(struct vm_area_struct *vma,
+ bool write, bool execute, bool foreign)
+{
+ /* by default, allow everything */
+ return true;
+}
+
+#define pkey_mm_init(mm)
+#define arch_dup_pkeys(oldmm, mm)
+
+static inline u64 pte_to_hpte_pkey_bits(u64 pteflags, unsigned long flags)
+{
+ return 0x0UL;
+}
+
+#endif /* CONFIG_PPC_MEM_KEYS */
+
+static inline int arch_dup_mmap(struct mm_struct *oldmm,
+ struct mm_struct *mm)
+{
+ arch_dup_pkeys(oldmm, mm);
+ return 0;
+}
+
+#include <asm-generic/mmu_context.h>
+
+#endif /* __KERNEL__ */
+#endif /* __ASM_POWERPC_MMU_CONTEXT_H */