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linux/arch/powerpc/include/asm/mmu.h
Christophe Leroy 79d9f965ec powerpc: Simplify strict_kernel_rwx_enabled() 
Now that rodata_enabled is always declared, remove #ifdef
and define a single version of strict_kernel_rwx_enabled().

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
2024-02-02 10:21:25 -08:00

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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_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;
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_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);
}
static inline bool strict_kernel_rwx_enabled(void)
{
return IS_ENABLED(CONFIG_STRICT_KERNEL_RWX) && rodata_enabled;
}
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
#if defined(CONFIG_FA_DUMP) || defined(CONFIG_PRESERVE_FA_DUMP)
#define __HAVE_ARCH_RESERVED_KERNEL_PAGES
#endif
#endif /* __KERNEL__ */
#endif /* _ASM_POWERPC_MMU_H_ */
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