Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  * Copyright IBM Corp. 2011
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  * Author(s): Jan Glauber <jang@linux.vnet.ibm.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6) #include <linux/hugetlb.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7) #include <linux/mm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8) #include <asm/cacheflush.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) #include <asm/facility.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) #include <asm/pgalloc.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #include <asm/page.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <asm/set_memory.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) static inline unsigned long sske_frame(unsigned long addr, unsigned char skey)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) 	asm volatile(".insn rrf,0xb22b0000,%[skey],%[addr],1,0"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) 		     : [addr] "+a" (addr) : [skey] "d" (skey));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) 	return addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) void __storage_key_init_range(unsigned long start, unsigned long end)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) 	unsigned long boundary, size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) 	while (start < end) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) 		if (MACHINE_HAS_EDAT1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) 			/* set storage keys for a 1MB frame */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) 			size = 1UL << 20;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) 			boundary = (start + size) & ~(size - 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) 			if (boundary <= end) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) 				do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) 					start = sske_frame(start, PAGE_DEFAULT_KEY);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) 				} while (start < boundary);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) 				continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 			}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 		page_set_storage_key(start, PAGE_DEFAULT_KEY, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 		start += PAGE_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) #ifdef CONFIG_PROC_FS
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) atomic_long_t direct_pages_count[PG_DIRECT_MAP_MAX];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) void arch_report_meminfo(struct seq_file *m)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 	seq_printf(m, "DirectMap4k:    %8lu kB\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 		   atomic_long_read(&direct_pages_count[PG_DIRECT_MAP_4K]) << 2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 	seq_printf(m, "DirectMap1M:    %8lu kB\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 		   atomic_long_read(&direct_pages_count[PG_DIRECT_MAP_1M]) << 10);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 	seq_printf(m, "DirectMap2G:    %8lu kB\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 		   atomic_long_read(&direct_pages_count[PG_DIRECT_MAP_2G]) << 21);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) #endif /* CONFIG_PROC_FS */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) static void pgt_set(unsigned long *old, unsigned long new, unsigned long addr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 		    unsigned long dtt)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 	unsigned long table, mask;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 	mask = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 	if (MACHINE_HAS_EDAT2) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 		switch (dtt) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 		case CRDTE_DTT_REGION3:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 			mask = ~(PTRS_PER_PUD * sizeof(pud_t) - 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 		case CRDTE_DTT_SEGMENT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 			mask = ~(PTRS_PER_PMD * sizeof(pmd_t) - 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 		case CRDTE_DTT_PAGE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 			mask = ~(PTRS_PER_PTE * sizeof(pte_t) - 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 		table = (unsigned long)old & mask;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 		crdte(*old, new, table, dtt, addr, S390_lowcore.kernel_asce);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 	} else if (MACHINE_HAS_IDTE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 		cspg(old, *old, new);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 		csp((unsigned int *)old + 1, *old, new);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) static int walk_pte_level(pmd_t *pmdp, unsigned long addr, unsigned long end,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 			  unsigned long flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 	pte_t *ptep, new;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 	ptep = pte_offset_kernel(pmdp, addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 	do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 		new = *ptep;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 		if (pte_none(new))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 			return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 		if (flags & SET_MEMORY_RO)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 			new = pte_wrprotect(new);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 		else if (flags & SET_MEMORY_RW)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 			new = pte_mkwrite(pte_mkdirty(new));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 		if (flags & SET_MEMORY_NX)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 			pte_val(new) |= _PAGE_NOEXEC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 		else if (flags & SET_MEMORY_X)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 			pte_val(new) &= ~_PAGE_NOEXEC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 		pgt_set((unsigned long *)ptep, pte_val(new), addr, CRDTE_DTT_PAGE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 		ptep++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 		addr += PAGE_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 		cond_resched();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 	} while (addr < end);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) static int split_pmd_page(pmd_t *pmdp, unsigned long addr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 	unsigned long pte_addr, prot;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 	pte_t *pt_dir, *ptep;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 	pmd_t new;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 	int i, ro, nx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 	pt_dir = vmem_pte_alloc();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 	if (!pt_dir)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 	pte_addr = pmd_pfn(*pmdp) << PAGE_SHIFT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 	ro = !!(pmd_val(*pmdp) & _SEGMENT_ENTRY_PROTECT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 	nx = !!(pmd_val(*pmdp) & _SEGMENT_ENTRY_NOEXEC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 	prot = pgprot_val(ro ? PAGE_KERNEL_RO : PAGE_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 	if (!nx)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 		prot &= ~_PAGE_NOEXEC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 	ptep = pt_dir;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 	for (i = 0; i < PTRS_PER_PTE; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 		pte_val(*ptep) = pte_addr | prot;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 		pte_addr += PAGE_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 		ptep++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 	pmd_val(new) = __pa(pt_dir) | _SEGMENT_ENTRY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 	pgt_set((unsigned long *)pmdp, pmd_val(new), addr, CRDTE_DTT_SEGMENT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 	update_page_count(PG_DIRECT_MAP_4K, PTRS_PER_PTE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 	update_page_count(PG_DIRECT_MAP_1M, -1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) static void modify_pmd_page(pmd_t *pmdp, unsigned long addr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 			    unsigned long flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 	pmd_t new = *pmdp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 	if (flags & SET_MEMORY_RO)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 		new = pmd_wrprotect(new);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 	else if (flags & SET_MEMORY_RW)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 		new = pmd_mkwrite(pmd_mkdirty(new));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 	if (flags & SET_MEMORY_NX)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 		pmd_val(new) |= _SEGMENT_ENTRY_NOEXEC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 	else if (flags & SET_MEMORY_X)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 		pmd_val(new) &= ~_SEGMENT_ENTRY_NOEXEC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 	pgt_set((unsigned long *)pmdp, pmd_val(new), addr, CRDTE_DTT_SEGMENT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) static int walk_pmd_level(pud_t *pudp, unsigned long addr, unsigned long end,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 			  unsigned long flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 	unsigned long next;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 	pmd_t *pmdp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 	int rc = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 	pmdp = pmd_offset(pudp, addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 	do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 		if (pmd_none(*pmdp))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 			return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 		next = pmd_addr_end(addr, end);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 		if (pmd_large(*pmdp)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 			if (addr & ~PMD_MASK || addr + PMD_SIZE > next) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 				rc = split_pmd_page(pmdp, addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 				if (rc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 					return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 				continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 			}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 			modify_pmd_page(pmdp, addr, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 		} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 			rc = walk_pte_level(pmdp, addr, next, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 			if (rc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 				return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 		pmdp++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 		addr = next;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 		cond_resched();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 	} while (addr < end);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 	return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) static int split_pud_page(pud_t *pudp, unsigned long addr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 	unsigned long pmd_addr, prot;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 	pmd_t *pm_dir, *pmdp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 	pud_t new;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 	int i, ro, nx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 	pm_dir = vmem_crst_alloc(_SEGMENT_ENTRY_EMPTY);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 	if (!pm_dir)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 	pmd_addr = pud_pfn(*pudp) << PAGE_SHIFT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 	ro = !!(pud_val(*pudp) & _REGION_ENTRY_PROTECT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 	nx = !!(pud_val(*pudp) & _REGION_ENTRY_NOEXEC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 	prot = pgprot_val(ro ? SEGMENT_KERNEL_RO : SEGMENT_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 	if (!nx)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 		prot &= ~_SEGMENT_ENTRY_NOEXEC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 	pmdp = pm_dir;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 	for (i = 0; i < PTRS_PER_PMD; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 		pmd_val(*pmdp) = pmd_addr | prot;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 		pmd_addr += PMD_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 		pmdp++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 	pud_val(new) = __pa(pm_dir) | _REGION3_ENTRY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 	pgt_set((unsigned long *)pudp, pud_val(new), addr, CRDTE_DTT_REGION3);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 	update_page_count(PG_DIRECT_MAP_1M, PTRS_PER_PMD);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 	update_page_count(PG_DIRECT_MAP_2G, -1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) static void modify_pud_page(pud_t *pudp, unsigned long addr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 			    unsigned long flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 	pud_t new = *pudp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 	if (flags & SET_MEMORY_RO)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 		new = pud_wrprotect(new);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 	else if (flags & SET_MEMORY_RW)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 		new = pud_mkwrite(pud_mkdirty(new));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 	if (flags & SET_MEMORY_NX)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 		pud_val(new) |= _REGION_ENTRY_NOEXEC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 	else if (flags & SET_MEMORY_X)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 		pud_val(new) &= ~_REGION_ENTRY_NOEXEC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 	pgt_set((unsigned long *)pudp, pud_val(new), addr, CRDTE_DTT_REGION3);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) static int walk_pud_level(p4d_t *p4d, unsigned long addr, unsigned long end,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 			  unsigned long flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 	unsigned long next;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 	pud_t *pudp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 	int rc = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 	pudp = pud_offset(p4d, addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 	do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 		if (pud_none(*pudp))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 			return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 		next = pud_addr_end(addr, end);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 		if (pud_large(*pudp)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 			if (addr & ~PUD_MASK || addr + PUD_SIZE > next) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 				rc = split_pud_page(pudp, addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 				if (rc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 					break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 				continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 			}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 			modify_pud_page(pudp, addr, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 		} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 			rc = walk_pmd_level(pudp, addr, next, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 		pudp++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 		addr = next;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 		cond_resched();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 	} while (addr < end && !rc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 	return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) static int walk_p4d_level(pgd_t *pgd, unsigned long addr, unsigned long end,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 			  unsigned long flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 	unsigned long next;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 	p4d_t *p4dp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 	int rc = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 	p4dp = p4d_offset(pgd, addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 	do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 		if (p4d_none(*p4dp))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 			return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 		next = p4d_addr_end(addr, end);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 		rc = walk_pud_level(p4dp, addr, next, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 		p4dp++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 		addr = next;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 		cond_resched();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 	} while (addr < end && !rc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 	return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) DEFINE_MUTEX(cpa_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) static int change_page_attr(unsigned long addr, unsigned long end,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 			    unsigned long flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) 	unsigned long next;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) 	int rc = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) 	pgd_t *pgdp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) 	if (addr == end)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) 	if (end >= MODULES_END)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) 	mutex_lock(&cpa_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) 	pgdp = pgd_offset_k(addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) 	do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) 		if (pgd_none(*pgdp))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) 		next = pgd_addr_end(addr, end);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) 		rc = walk_p4d_level(pgdp, addr, next, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) 		if (rc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) 		cond_resched();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) 	} while (pgdp++, addr = next, addr < end && !rc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) 	mutex_unlock(&cpa_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) 	return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) int __set_memory(unsigned long addr, int numpages, unsigned long flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) 	if (!MACHINE_HAS_NX)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) 		flags &= ~(SET_MEMORY_NX | SET_MEMORY_X);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) 	if (!flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) 	addr &= PAGE_MASK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) 	return change_page_attr(addr, addr + numpages * PAGE_SIZE, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) #ifdef CONFIG_DEBUG_PAGEALLOC
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) static void ipte_range(pte_t *pte, unsigned long address, int nr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) 	int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) 	if (test_facility(13)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) 		__ptep_ipte_range(address, nr - 1, pte, IPTE_GLOBAL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) 	for (i = 0; i < nr; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) 		__ptep_ipte(address, pte, 0, 0, IPTE_GLOBAL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) 		address += PAGE_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) 		pte++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) void __kernel_map_pages(struct page *page, int numpages, int enable)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) 	unsigned long address;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) 	int nr, i, j;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) 	pte_t *pte;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) 	for (i = 0; i < numpages;) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) 		address = page_to_phys(page + i);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) 		pte = virt_to_kpte(address);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) 		nr = (unsigned long)pte >> ilog2(sizeof(long));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) 		nr = PTRS_PER_PTE - (nr & (PTRS_PER_PTE - 1));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) 		nr = min(numpages - i, nr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) 		if (enable) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) 			for (j = 0; j < nr; j++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) 				pte_val(*pte) &= ~_PAGE_INVALID;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) 				address += PAGE_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) 				pte++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) 			}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) 		} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) 			ipte_range(pte, address, nr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) 		i += nr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) #endif /* CONFIG_DEBUG_PAGEALLOC */