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linux-stable/arch/powerpc/include/asm/mmu.h
Nicholas Piggin c28573744b powerpc/64s: Make hash MMU support configurable 
This adds Kconfig selection which allows 64s hash MMU support to be
disabled. It can be disabled if radix support is enabled, the minimum
supported CPU type is POWER9 (or higher), and KVM is not selected.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20211201144153.2456614-17-npiggin@gmail.com
2021-12-09 22:40:24 +11:00

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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)
/* Enable use of TLB reservation. Processor should support tlbsrx.
* instruction and MAS0[WQ].
*/
#define MMU_FTR_USE_TLBRSRV ASM_CONST(0x00800000)
/* Use paired MAS registers (MAS7||MAS3, etc.)
*/
#define MMU_FTR_USE_PAIRED_MAS ASM_CONST(0x01000000)
/* 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)
/* 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_FSL_BOOK3E
#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_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_BOOK3E_64
MMU_FTR_USE_TLBRSRV | MMU_FTR_USE_PAIRED_MAS |
#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 |
#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_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_ */
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