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-rw-r--r--arch/powerpc/include/asm/mmu.h421
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diff --git a/arch/powerpc/include/asm/mmu.h b/arch/powerpc/include/asm/mmu.h
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+++ b/arch/powerpc/include/asm/mmu.h
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+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _ASM_POWERPC_MMU_H_
+#define _ASM_POWERPC_MMU_H_
+#ifdef __KERNEL__
+
+#include <linux/types.h>
+
+#include <asm/asm-const.h>
+
+/*
+ * MMU features bit definitions
+ */
+
+/*
+ * MMU families
+ */
+#define MMU_FTR_HPTE_TABLE ASM_CONST(0x00000001)
+#define MMU_FTR_TYPE_8xx ASM_CONST(0x00000002)
+#define MMU_FTR_TYPE_40x ASM_CONST(0x00000004)
+#define MMU_FTR_TYPE_44x ASM_CONST(0x00000008)
+#define MMU_FTR_TYPE_FSL_E ASM_CONST(0x00000010)
+#define MMU_FTR_TYPE_47x ASM_CONST(0x00000020)
+
+/* Radix page table supported and enabled */
+#define MMU_FTR_TYPE_RADIX ASM_CONST(0x00000040)
+
+/*
+ * Individual features below.
+ */
+
+/*
+ * Supports KUAP feature
+ * key 0 controlling userspace addresses on radix
+ * Key 3 on hash
+ */
+#define MMU_FTR_BOOK3S_KUAP ASM_CONST(0x00000200)
+
+/*
+ * Supports KUEP feature
+ * key 0 controlling userspace addresses on radix
+ * Key 3 on hash
+ */
+#define MMU_FTR_BOOK3S_KUEP ASM_CONST(0x00000400)
+
+/*
+ * Support for memory protection keys.
+ */
+#define MMU_FTR_PKEY ASM_CONST(0x00000800)
+
+/* Guest Translation Shootdown Enable */
+#define MMU_FTR_GTSE ASM_CONST(0x00001000)
+
+/*
+ * Support for 68 bit VA space. We added that from ISA 2.05
+ */
+#define MMU_FTR_68_BIT_VA ASM_CONST(0x00002000)
+/*
+ * Kernel read only support.
+ * We added the ppp value 0b110 in ISA 2.04.
+ */
+#define MMU_FTR_KERNEL_RO ASM_CONST(0x00004000)
+
+/*
+ * We need to clear top 16bits of va (from the remaining 64 bits )in
+ * tlbie* instructions
+ */
+#define MMU_FTR_TLBIE_CROP_VA ASM_CONST(0x00008000)
+
+/* Enable use of high BAT registers */
+#define MMU_FTR_USE_HIGH_BATS ASM_CONST(0x00010000)
+
+/* Enable >32-bit physical addresses on 32-bit processor, only used
+ * by CONFIG_PPC_BOOK3S_32 currently as BookE supports that from day 1
+ */
+#define MMU_FTR_BIG_PHYS ASM_CONST(0x00020000)
+
+/* Enable use of broadcast TLB invalidations. We don't always set it
+ * on processors that support it due to other constraints with the
+ * use of such invalidations
+ */
+#define MMU_FTR_USE_TLBIVAX_BCAST ASM_CONST(0x00040000)
+
+/* Enable use of tlbilx invalidate instructions.
+ */
+#define MMU_FTR_USE_TLBILX ASM_CONST(0x00080000)
+
+/* This indicates that the processor cannot handle multiple outstanding
+ * broadcast tlbivax or tlbsync. This makes the code use a spinlock
+ * around such invalidate forms.
+ */
+#define MMU_FTR_LOCK_BCAST_INVAL ASM_CONST(0x00100000)
+
+/* This indicates that the processor doesn't handle way selection
+ * properly and needs SW to track and update the LRU state. This
+ * is specific to an errata on e300c2/c3/c4 class parts
+ */
+#define MMU_FTR_NEED_DTLB_SW_LRU ASM_CONST(0x00200000)
+
+/* Doesn't support the B bit (1T segment) in SLBIE
+ */
+#define MMU_FTR_NO_SLBIE_B ASM_CONST(0x02000000)
+
+/* Support 16M large pages
+ */
+#define MMU_FTR_16M_PAGE ASM_CONST(0x04000000)
+
+/* Supports TLBIEL variant
+ */
+#define MMU_FTR_TLBIEL ASM_CONST(0x08000000)
+
+/* Supports tlbies w/o locking
+ */
+#define MMU_FTR_LOCKLESS_TLBIE ASM_CONST(0x10000000)
+
+/* Large pages can be marked CI
+ */
+#define MMU_FTR_CI_LARGE_PAGE ASM_CONST(0x20000000)
+
+/* 1T segments available
+ */
+#define MMU_FTR_1T_SEGMENT ASM_CONST(0x40000000)
+
+// NX paste RMA reject in DSI
+#define MMU_FTR_NX_DSI ASM_CONST(0x80000000)
+
+/* MMU feature bit sets for various CPUs */
+#define MMU_FTRS_DEFAULT_HPTE_ARCH_V2 (MMU_FTR_HPTE_TABLE | MMU_FTR_TLBIEL | MMU_FTR_16M_PAGE)
+#define MMU_FTRS_POWER MMU_FTRS_DEFAULT_HPTE_ARCH_V2
+#define MMU_FTRS_PPC970 MMU_FTRS_POWER | MMU_FTR_TLBIE_CROP_VA
+#define MMU_FTRS_POWER5 MMU_FTRS_POWER | MMU_FTR_LOCKLESS_TLBIE
+#define MMU_FTRS_POWER6 MMU_FTRS_POWER5 | MMU_FTR_KERNEL_RO | MMU_FTR_68_BIT_VA
+#define MMU_FTRS_POWER7 MMU_FTRS_POWER6
+#define MMU_FTRS_POWER8 MMU_FTRS_POWER6
+#define MMU_FTRS_POWER9 MMU_FTRS_POWER6
+#define MMU_FTRS_POWER10 MMU_FTRS_POWER6
+#define MMU_FTRS_CELL MMU_FTRS_DEFAULT_HPTE_ARCH_V2 | \
+ MMU_FTR_CI_LARGE_PAGE
+#define MMU_FTRS_PA6T MMU_FTRS_DEFAULT_HPTE_ARCH_V2 | \
+ MMU_FTR_CI_LARGE_PAGE | MMU_FTR_NO_SLBIE_B
+#ifndef __ASSEMBLY__
+#include <linux/bug.h>
+#include <asm/cputable.h>
+#include <asm/page.h>
+
+typedef pte_t *pgtable_t;
+
+#ifdef CONFIG_PPC_E500
+#include <asm/percpu.h>
+DECLARE_PER_CPU(int, next_tlbcam_idx);
+#endif
+
+enum {
+ MMU_FTRS_POSSIBLE =
+#if defined(CONFIG_PPC_BOOK3S_604)
+ MMU_FTR_HPTE_TABLE |
+#endif
+#ifdef CONFIG_PPC_8xx
+ MMU_FTR_TYPE_8xx |
+#endif
+#ifdef CONFIG_40x
+ MMU_FTR_TYPE_40x |
+#endif
+#ifdef CONFIG_PPC_47x
+ MMU_FTR_TYPE_47x | MMU_FTR_USE_TLBIVAX_BCAST | MMU_FTR_LOCK_BCAST_INVAL |
+#elif defined(CONFIG_44x)
+ MMU_FTR_TYPE_44x |
+#endif
+#ifdef CONFIG_PPC_E500
+ MMU_FTR_TYPE_FSL_E | MMU_FTR_BIG_PHYS | MMU_FTR_USE_TLBILX |
+#endif
+#ifdef CONFIG_PPC_BOOK3S_32
+ MMU_FTR_USE_HIGH_BATS |
+#endif
+#ifdef CONFIG_PPC_83xx
+ MMU_FTR_NEED_DTLB_SW_LRU |
+#endif
+#ifdef CONFIG_PPC_BOOK3S_64
+ MMU_FTR_KERNEL_RO |
+#ifdef CONFIG_PPC_64S_HASH_MMU
+ MMU_FTR_NO_SLBIE_B | MMU_FTR_16M_PAGE | MMU_FTR_TLBIEL |
+ MMU_FTR_LOCKLESS_TLBIE | MMU_FTR_CI_LARGE_PAGE |
+ MMU_FTR_1T_SEGMENT | MMU_FTR_TLBIE_CROP_VA |
+ MMU_FTR_68_BIT_VA | MMU_FTR_HPTE_TABLE |
+#endif
+#ifdef CONFIG_PPC_RADIX_MMU
+ MMU_FTR_TYPE_RADIX |
+ MMU_FTR_GTSE | MMU_FTR_NX_DSI |
+#endif /* CONFIG_PPC_RADIX_MMU */
+#endif
+#ifdef CONFIG_PPC_KUAP
+ MMU_FTR_BOOK3S_KUAP |
+#endif /* CONFIG_PPC_KUAP */
+#ifdef CONFIG_PPC_MEM_KEYS
+ MMU_FTR_PKEY |
+#endif
+#ifdef CONFIG_PPC_KUEP
+ MMU_FTR_BOOK3S_KUEP |
+#endif /* CONFIG_PPC_KUAP */
+
+ 0,
+};
+
+#if defined(CONFIG_PPC_BOOK3S_604) && !defined(CONFIG_PPC_BOOK3S_603)
+#define MMU_FTRS_ALWAYS MMU_FTR_HPTE_TABLE
+#endif
+#ifdef CONFIG_PPC_8xx
+#define MMU_FTRS_ALWAYS MMU_FTR_TYPE_8xx
+#endif
+#ifdef CONFIG_40x
+#define MMU_FTRS_ALWAYS MMU_FTR_TYPE_40x
+#endif
+#ifdef CONFIG_PPC_47x
+#define MMU_FTRS_ALWAYS MMU_FTR_TYPE_47x
+#elif defined(CONFIG_44x)
+#define MMU_FTRS_ALWAYS MMU_FTR_TYPE_44x
+#endif
+#ifdef CONFIG_PPC_E500
+#define MMU_FTRS_ALWAYS MMU_FTR_TYPE_FSL_E
+#endif
+
+/* BOOK3S_64 options */
+#if defined(CONFIG_PPC_RADIX_MMU) && !defined(CONFIG_PPC_64S_HASH_MMU)
+#define MMU_FTRS_ALWAYS MMU_FTR_TYPE_RADIX
+#elif !defined(CONFIG_PPC_RADIX_MMU) && defined(CONFIG_PPC_64S_HASH_MMU)
+#define MMU_FTRS_ALWAYS MMU_FTR_HPTE_TABLE
+#endif
+
+#ifndef MMU_FTRS_ALWAYS
+#define MMU_FTRS_ALWAYS 0
+#endif
+
+static __always_inline bool early_mmu_has_feature(unsigned long feature)
+{
+ if (MMU_FTRS_ALWAYS & feature)
+ return true;
+
+ return !!(MMU_FTRS_POSSIBLE & cur_cpu_spec->mmu_features & feature);
+}
+
+#ifdef CONFIG_JUMP_LABEL_FEATURE_CHECKS
+#include <linux/jump_label.h>
+
+#define NUM_MMU_FTR_KEYS 32
+
+extern struct static_key_true mmu_feature_keys[NUM_MMU_FTR_KEYS];
+
+extern void mmu_feature_keys_init(void);
+
+static __always_inline bool mmu_has_feature(unsigned long feature)
+{
+ int i;
+
+#ifndef __clang__ /* clang can't cope with this */
+ BUILD_BUG_ON(!__builtin_constant_p(feature));
+#endif
+
+#ifdef CONFIG_JUMP_LABEL_FEATURE_CHECK_DEBUG
+ if (!static_key_initialized) {
+ printk("Warning! mmu_has_feature() used prior to jump label init!\n");
+ dump_stack();
+ return early_mmu_has_feature(feature);
+ }
+#endif
+
+ if (MMU_FTRS_ALWAYS & feature)
+ return true;
+
+ if (!(MMU_FTRS_POSSIBLE & feature))
+ return false;
+
+ i = __builtin_ctzl(feature);
+ return static_branch_likely(&mmu_feature_keys[i]);
+}
+
+static inline void mmu_clear_feature(unsigned long feature)
+{
+ int i;
+
+ i = __builtin_ctzl(feature);
+ cur_cpu_spec->mmu_features &= ~feature;
+ static_branch_disable(&mmu_feature_keys[i]);
+}
+#else
+
+static inline void mmu_feature_keys_init(void)
+{
+
+}
+
+static __always_inline bool mmu_has_feature(unsigned long feature)
+{
+ return early_mmu_has_feature(feature);
+}
+
+static inline void mmu_clear_feature(unsigned long feature)
+{
+ cur_cpu_spec->mmu_features &= ~feature;
+}
+#endif /* CONFIG_JUMP_LABEL */
+
+extern unsigned int __start___mmu_ftr_fixup, __stop___mmu_ftr_fixup;
+
+#ifdef CONFIG_PPC64
+/* This is our real memory area size on ppc64 server, on embedded, we
+ * make it match the size our of bolted TLB area
+ */
+extern u64 ppc64_rma_size;
+
+/* Cleanup function used by kexec */
+extern void mmu_cleanup_all(void);
+extern void radix__mmu_cleanup_all(void);
+
+/* Functions for creating and updating partition table on POWER9 */
+extern void mmu_partition_table_init(void);
+extern void mmu_partition_table_set_entry(unsigned int lpid, unsigned long dw0,
+ unsigned long dw1, bool flush);
+#endif /* CONFIG_PPC64 */
+
+struct mm_struct;
+#ifdef CONFIG_DEBUG_VM
+extern void assert_pte_locked(struct mm_struct *mm, unsigned long addr);
+#else /* CONFIG_DEBUG_VM */
+static inline void assert_pte_locked(struct mm_struct *mm, unsigned long addr)
+{
+}
+#endif /* !CONFIG_DEBUG_VM */
+
+static __always_inline bool radix_enabled(void)
+{
+ return mmu_has_feature(MMU_FTR_TYPE_RADIX);
+}
+
+static __always_inline bool early_radix_enabled(void)
+{
+ return early_mmu_has_feature(MMU_FTR_TYPE_RADIX);
+}
+
+#ifdef CONFIG_STRICT_KERNEL_RWX
+static inline bool strict_kernel_rwx_enabled(void)
+{
+ return rodata_enabled;
+}
+#else
+static inline bool strict_kernel_rwx_enabled(void)
+{
+ return false;
+}
+#endif
+
+static inline bool strict_module_rwx_enabled(void)
+{
+ return IS_ENABLED(CONFIG_STRICT_MODULE_RWX) && strict_kernel_rwx_enabled();
+}
+#endif /* !__ASSEMBLY__ */
+
+/* The kernel use the constants below to index in the page sizes array.
+ * The use of fixed constants for this purpose is better for performances
+ * of the low level hash refill handlers.
+ *
+ * A non supported page size has a "shift" field set to 0
+ *
+ * Any new page size being implemented can get a new entry in here. Whether
+ * the kernel will use it or not is a different matter though. The actual page
+ * size used by hugetlbfs is not defined here and may be made variable
+ *
+ * Note: This array ended up being a false good idea as it's growing to the
+ * point where I wonder if we should replace it with something different,
+ * to think about, feedback welcome. --BenH.
+ */
+
+/* These are #defines as they have to be used in assembly */
+#define MMU_PAGE_4K 0
+#define MMU_PAGE_16K 1
+#define MMU_PAGE_64K 2
+#define MMU_PAGE_64K_AP 3 /* "Admixed pages" (hash64 only) */
+#define MMU_PAGE_256K 4
+#define MMU_PAGE_512K 5
+#define MMU_PAGE_1M 6
+#define MMU_PAGE_2M 7
+#define MMU_PAGE_4M 8
+#define MMU_PAGE_8M 9
+#define MMU_PAGE_16M 10
+#define MMU_PAGE_64M 11
+#define MMU_PAGE_256M 12
+#define MMU_PAGE_1G 13
+#define MMU_PAGE_16G 14
+#define MMU_PAGE_64G 15
+
+/*
+ * N.B. we need to change the type of hpte_page_sizes if this gets to be > 16
+ * Also we need to change he type of mm_context.low/high_slices_psize.
+ */
+#define MMU_PAGE_COUNT 16
+
+#ifdef CONFIG_PPC_BOOK3S_64
+#include <asm/book3s/64/mmu.h>
+#else /* CONFIG_PPC_BOOK3S_64 */
+
+#ifndef __ASSEMBLY__
+/* MMU initialization */
+extern void early_init_mmu(void);
+extern void early_init_mmu_secondary(void);
+extern void setup_initial_memory_limit(phys_addr_t first_memblock_base,
+ phys_addr_t first_memblock_size);
+static inline void mmu_early_init_devtree(void) { }
+
+static inline void pkey_early_init_devtree(void) {}
+
+extern void *abatron_pteptrs[2];
+#endif /* __ASSEMBLY__ */
+#endif
+
+#if defined(CONFIG_PPC_BOOK3S_32)
+/* 32-bit classic hash table MMU */
+#include <asm/book3s/32/mmu-hash.h>
+#elif defined(CONFIG_PPC_MMU_NOHASH)
+#include <asm/nohash/mmu.h>
+#endif
+
+#endif /* __KERNEL__ */
+#endif /* _ASM_POWERPC_MMU_H_ */