projects / linux-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 6ad3df56 EL |
1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| 2 | /* | |
| 3 | * KFENCE support for LoongArch. | |
| 4 | * | |
| 5 | * Author: Enze Li <lienze@kylinos.cn> | |
| 6 | * Copyright (C) 2022-2023 KylinSoft Corporation. | |
| 7 | */ | |
| 8 | ||
| 9 | #ifndef _ASM_LOONGARCH_KFENCE_H | |
| 10 | #define _ASM_LOONGARCH_KFENCE_H | |
| 11 | ||
| 12 | #include <linux/kfence.h> | |
| 0069455b | 13 | #include <linux/vmalloc.h> |
| 6ad3df56 EL |
14 | #include <asm/pgtable.h> |
| 15 | #include <asm/tlb.h> | |
| 16 | ||
| 17 | static inline bool arch_kfence_init_pool(void) | |
| 18 | { | |
| 19 | int err; | |
| 0ca84aea | 20 | char *kaddr, *vaddr; |
| 6ad3df56 EL |
21 | char *kfence_pool = __kfence_pool; |
| 22 | struct vm_struct *area; | |
| 23 | ||
| 24 | area = __get_vm_area_caller(KFENCE_POOL_SIZE, VM_IOREMAP, | |
| 25 | KFENCE_AREA_START, KFENCE_AREA_END, | |
| 26 | __builtin_return_address(0)); | |
| 27 | if (!area) | |
| 28 | return false; | |
| 29 | ||
| 30 | __kfence_pool = (char *)area->addr; | |
| 31 | err = ioremap_page_range((unsigned long)__kfence_pool, | |
| 32 | (unsigned long)__kfence_pool + KFENCE_POOL_SIZE, | |
| 33 | virt_to_phys((void *)kfence_pool), PAGE_KERNEL); | |
| 34 | if (err) { | |
| 35 | free_vm_area(area); | |
| 36 | __kfence_pool = kfence_pool; | |
| 37 | return false; | |
| 38 | } | |
| 39 | ||
| 0ca84aea HC |
40 | kaddr = kfence_pool; |
| 41 | vaddr = __kfence_pool; | |
| 42 | while (kaddr < kfence_pool + KFENCE_POOL_SIZE) { | |
| 43 | set_page_address(virt_to_page(kaddr), vaddr); | |
| 44 | kaddr += PAGE_SIZE; | |
| 45 | vaddr += PAGE_SIZE; | |
| 46 | } | |
| 47 | ||
| 6ad3df56 EL |
48 | return true; |
| 49 | } | |
| 50 | ||
| 51 | /* Protect the given page and flush TLB. */ | |
| 52 | static inline bool kfence_protect_page(unsigned long addr, bool protect) | |
| 53 | { | |
| 54 | pte_t *pte = virt_to_kpte(addr); | |
| 55 | ||
| 56 | if (WARN_ON(!pte) || pte_none(*pte)) | |
| 57 | return false; | |
| 58 | ||
| 59 | if (protect) | |
| 60 | set_pte(pte, __pte(pte_val(*pte) & ~(_PAGE_VALID | _PAGE_PRESENT))); | |
| 61 | else | |
| 62 | set_pte(pte, __pte(pte_val(*pte) | (_PAGE_VALID | _PAGE_PRESENT))); | |
| 63 | ||
| 64 | preempt_disable(); | |
| 65 | local_flush_tlb_one(addr); | |
| 66 | preempt_enable(); | |
| 67 | ||
| 68 | return true; | |
| 69 | } | |
| 70 | ||
| 71 | #endif /* _ASM_LOONGARCH_KFENCE_H */ |