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Linux/lib/ioremap.c

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  1 // SPDX-License-Identifier: GPL-2.0
  2 /*
  3  * Re-map IO memory to kernel address space so that we can access it.
  4  * This is needed for high PCI addresses that aren't mapped in the
  5  * 640k-1MB IO memory area on PC's
  6  *
  7  * (C) Copyright 1995 1996 Linus Torvalds
  8  */
  9 #include <linux/vmalloc.h>
 10 #include <linux/mm.h>
 11 #include <linux/sched.h>
 12 #include <linux/io.h>
 13 #include <linux/export.h>
 14 #include <asm/cacheflush.h>
 15 #include <asm/pgtable.h>
 16 
 17 #ifdef CONFIG_HAVE_ARCH_HUGE_VMAP
 18 static int __read_mostly ioremap_p4d_capable;
 19 static int __read_mostly ioremap_pud_capable;
 20 static int __read_mostly ioremap_pmd_capable;
 21 static int __read_mostly ioremap_huge_disabled;
 22 
 23 static int __init set_nohugeiomap(char *str)
 24 {
 25         ioremap_huge_disabled = 1;
 26         return 0;
 27 }
 28 early_param("nohugeiomap", set_nohugeiomap);
 29 
 30 void __init ioremap_huge_init(void)
 31 {
 32         if (!ioremap_huge_disabled) {
 33                 if (arch_ioremap_pud_supported())
 34                         ioremap_pud_capable = 1;
 35                 if (arch_ioremap_pmd_supported())
 36                         ioremap_pmd_capable = 1;
 37         }
 38 }
 39 
 40 static inline int ioremap_p4d_enabled(void)
 41 {
 42         return ioremap_p4d_capable;
 43 }
 44 
 45 static inline int ioremap_pud_enabled(void)
 46 {
 47         return ioremap_pud_capable;
 48 }
 49 
 50 static inline int ioremap_pmd_enabled(void)
 51 {
 52         return ioremap_pmd_capable;
 53 }
 54 
 55 #else   /* !CONFIG_HAVE_ARCH_HUGE_VMAP */
 56 static inline int ioremap_p4d_enabled(void) { return 0; }
 57 static inline int ioremap_pud_enabled(void) { return 0; }
 58 static inline int ioremap_pmd_enabled(void) { return 0; }
 59 #endif  /* CONFIG_HAVE_ARCH_HUGE_VMAP */
 60 
 61 static int ioremap_pte_range(pmd_t *pmd, unsigned long addr,
 62                 unsigned long end, phys_addr_t phys_addr, pgprot_t prot)
 63 {
 64         pte_t *pte;
 65         u64 pfn;
 66 
 67         pfn = phys_addr >> PAGE_SHIFT;
 68         pte = pte_alloc_kernel(pmd, addr);
 69         if (!pte)
 70                 return -ENOMEM;
 71         do {
 72                 BUG_ON(!pte_none(*pte));
 73                 set_pte_at(&init_mm, addr, pte, pfn_pte(pfn, prot));
 74                 pfn++;
 75         } while (pte++, addr += PAGE_SIZE, addr != end);
 76         return 0;
 77 }
 78 
 79 static inline int ioremap_pmd_range(pud_t *pud, unsigned long addr,
 80                 unsigned long end, phys_addr_t phys_addr, pgprot_t prot)
 81 {
 82         pmd_t *pmd;
 83         unsigned long next;
 84 
 85         phys_addr -= addr;
 86         pmd = pmd_alloc(&init_mm, pud, addr);
 87         if (!pmd)
 88                 return -ENOMEM;
 89         do {
 90                 next = pmd_addr_end(addr, end);
 91 
 92                 if (ioremap_pmd_enabled() &&
 93                     ((next - addr) == PMD_SIZE) &&
 94                     IS_ALIGNED(phys_addr + addr, PMD_SIZE) &&
 95                     pmd_free_pte_page(pmd, addr)) {
 96                         if (pmd_set_huge(pmd, phys_addr + addr, prot))
 97                                 continue;
 98                 }
 99 
100                 if (ioremap_pte_range(pmd, addr, next, phys_addr + addr, prot))
101                         return -ENOMEM;
102         } while (pmd++, addr = next, addr != end);
103         return 0;
104 }
105 
106 static inline int ioremap_pud_range(p4d_t *p4d, unsigned long addr,
107                 unsigned long end, phys_addr_t phys_addr, pgprot_t prot)
108 {
109         pud_t *pud;
110         unsigned long next;
111 
112         phys_addr -= addr;
113         pud = pud_alloc(&init_mm, p4d, addr);
114         if (!pud)
115                 return -ENOMEM;
116         do {
117                 next = pud_addr_end(addr, end);
118 
119                 if (ioremap_pud_enabled() &&
120                     ((next - addr) == PUD_SIZE) &&
121                     IS_ALIGNED(phys_addr + addr, PUD_SIZE) &&
122                     pud_free_pmd_page(pud, addr)) {
123                         if (pud_set_huge(pud, phys_addr + addr, prot))
124                                 continue;
125                 }
126 
127                 if (ioremap_pmd_range(pud, addr, next, phys_addr + addr, prot))
128                         return -ENOMEM;
129         } while (pud++, addr = next, addr != end);
130         return 0;
131 }
132 
133 static inline int ioremap_p4d_range(pgd_t *pgd, unsigned long addr,
134                 unsigned long end, phys_addr_t phys_addr, pgprot_t prot)
135 {
136         p4d_t *p4d;
137         unsigned long next;
138 
139         phys_addr -= addr;
140         p4d = p4d_alloc(&init_mm, pgd, addr);
141         if (!p4d)
142                 return -ENOMEM;
143         do {
144                 next = p4d_addr_end(addr, end);
145 
146                 if (ioremap_p4d_enabled() &&
147                     ((next - addr) == P4D_SIZE) &&
148                     IS_ALIGNED(phys_addr + addr, P4D_SIZE)) {
149                         if (p4d_set_huge(p4d, phys_addr + addr, prot))
150                                 continue;
151                 }
152 
153                 if (ioremap_pud_range(p4d, addr, next, phys_addr + addr, prot))
154                         return -ENOMEM;
155         } while (p4d++, addr = next, addr != end);
156         return 0;
157 }
158 
159 int ioremap_page_range(unsigned long addr,
160                        unsigned long end, phys_addr_t phys_addr, pgprot_t prot)
161 {
162         pgd_t *pgd;
163         unsigned long start;
164         unsigned long next;
165         int err;
166 
167         might_sleep();
168         BUG_ON(addr >= end);
169 
170         start = addr;
171         phys_addr -= addr;
172         pgd = pgd_offset_k(addr);
173         do {
174                 next = pgd_addr_end(addr, end);
175                 err = ioremap_p4d_range(pgd, addr, next, phys_addr+addr, prot);
176                 if (err)
177                         break;
178         } while (pgd++, addr = next, addr != end);
179 
180         flush_cache_vmap(start, end);
181 
182         return err;
183 }
184 

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