1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * PowerPC version 4 * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org) 5 * 6 * Modifications by Paul Mackerras (PowerMac) (paulus@cs.anu.edu.au) 7 * and Cort Dougan (PReP) (cort@cs.nmt.edu) 8 * Copyright (C) 1996 Paul Mackerras 9 * PPC44x/36-bit changes by Matt Porter (mporter@mvista.com) 10 * 11 * Derived from "arch/i386/mm/init.c" 12 * Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds 13 */ 14 15 #include <linux/memblock.h> 16 #include <linux/highmem.h> 17 #include <linux/suspend.h> 18 #include <linux/dma-direct.h> 19 20 #include <asm/machdep.h> 21 #include <asm/rtas.h> 22 #include <asm/kasan.h> 23 #include <asm/svm.h> 24 #include <asm/mmzone.h> 25 26 #include <mm/mmu_decl.h> 27 28 unsigned long long memory_limit; 29 30 unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)] __page_aligned_bss; 31 EXPORT_SYMBOL(empty_zero_page); 32 33 pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn, 34 unsigned long size, pgprot_t vma_prot) 35 { 36 if (ppc_md.phys_mem_access_prot) 37 return ppc_md.phys_mem_access_prot(file, pfn, size, vma_prot); 38 39 if (!page_is_ram(pfn)) 40 vma_prot = pgprot_noncached(vma_prot); 41 42 return vma_prot; 43 } 44 EXPORT_SYMBOL(phys_mem_access_prot); 45 46 #ifdef CONFIG_MEMORY_HOTPLUG 47 static DEFINE_MUTEX(linear_mapping_mutex); 48 49 #ifdef CONFIG_NUMA 50 int memory_add_physaddr_to_nid(u64 start) 51 { 52 return hot_add_scn_to_nid(start); 53 } 54 #endif 55 56 int __weak create_section_mapping(unsigned long start, unsigned long end, 57 int nid, pgprot_t prot) 58 { 59 return -ENODEV; 60 } 61 62 int __weak remove_section_mapping(unsigned long start, unsigned long end) 63 { 64 return -ENODEV; 65 } 66 67 int __ref arch_create_linear_mapping(int nid, u64 start, u64 size, 68 struct mhp_params *params) 69 { 70 int rc; 71 72 start = (unsigned long)__va(start); 73 mutex_lock(&linear_mapping_mutex); 74 rc = create_section_mapping(start, start + size, nid, 75 params->pgprot); 76 mutex_unlock(&linear_mapping_mutex); 77 if (rc) { 78 pr_warn("Unable to create linear mapping for 0x%llx..0x%llx: %d\n", 79 start, start + size, rc); 80 return -EFAULT; 81 } 82 return 0; 83 } 84 85 void __ref arch_remove_linear_mapping(u64 start, u64 size) 86 { 87 int ret; 88 89 /* Remove htab bolted mappings for this section of memory */ 90 start = (unsigned long)__va(start); 91 92 mutex_lock(&linear_mapping_mutex); 93 ret = remove_section_mapping(start, start + size); 94 mutex_unlock(&linear_mapping_mutex); 95 if (ret) 96 pr_warn("Unable to remove linear mapping for 0x%llx..0x%llx: %d\n", 97 start, start + size, ret); 98 99 /* Ensure all vmalloc mappings are flushed in case they also 100 * hit that section of memory 101 */ 102 vm_unmap_aliases(); 103 } 104 105 int __ref arch_add_memory(int nid, u64 start, u64 size, 106 struct mhp_params *params) 107 { 108 unsigned long start_pfn = start >> PAGE_SHIFT; 109 unsigned long nr_pages = size >> PAGE_SHIFT; 110 int rc; 111 112 rc = arch_create_linear_mapping(nid, start, size, params); 113 if (rc) 114 return rc; 115 rc = __add_pages(nid, start_pfn, nr_pages, params); 116 if (rc) 117 arch_remove_linear_mapping(start, size); 118 return rc; 119 } 120 121 void __ref arch_remove_memory(u64 start, u64 size, struct vmem_altmap *altmap) 122 { 123 unsigned long start_pfn = start >> PAGE_SHIFT; 124 unsigned long nr_pages = size >> PAGE_SHIFT; 125 126 __remove_pages(start_pfn, nr_pages, altmap); 127 arch_remove_linear_mapping(start, size); 128 } 129 #endif 130 131 #ifndef CONFIG_NUMA 132 void __init mem_topology_setup(void) 133 { 134 max_low_pfn = max_pfn = memblock_end_of_DRAM() >> PAGE_SHIFT; 135 min_low_pfn = MEMORY_START >> PAGE_SHIFT; 136 #ifdef CONFIG_HIGHMEM 137 max_low_pfn = lowmem_end_addr >> PAGE_SHIFT; 138 #endif 139 140 /* Place all memblock_regions in the same node and merge contiguous 141 * memblock_regions 142 */ 143 memblock_set_node(0, PHYS_ADDR_MAX, &memblock.memory, 0); 144 } 145 146 void __init initmem_init(void) 147 { 148 sparse_init(); 149 } 150 151 /* mark pages that don't exist as nosave */ 152 static int __init mark_nonram_nosave(void) 153 { 154 unsigned long spfn, epfn, prev = 0; 155 int i; 156 157 for_each_mem_pfn_range(i, MAX_NUMNODES, &spfn, &epfn, NULL) { 158 if (prev && prev < spfn) 159 register_nosave_region(prev, spfn); 160 161 prev = epfn; 162 } 163 164 return 0; 165 } 166 #else /* CONFIG_NUMA */ 167 static int __init mark_nonram_nosave(void) 168 { 169 return 0; 170 } 171 #endif 172 173 /* 174 * Zones usage: 175 * 176 * We setup ZONE_DMA to be 31-bits on all platforms and ZONE_NORMAL to be 177 * everything else. GFP_DMA32 page allocations automatically fall back to 178 * ZONE_DMA. 179 * 180 * By using 31-bit unconditionally, we can exploit zone_dma_bits to inform the 181 * generic DMA mapping code. 32-bit only devices (if not handled by an IOMMU 182 * anyway) will take a first dip into ZONE_NORMAL and get otherwise served by 183 * ZONE_DMA. 184 */ 185 static unsigned long max_zone_pfns[MAX_NR_ZONES]; 186 187 /* 188 * paging_init() sets up the page tables - in fact we've already done this. 189 */ 190 void __init paging_init(void) 191 { 192 unsigned long long total_ram = memblock_phys_mem_size(); 193 phys_addr_t top_of_ram = memblock_end_of_DRAM(); 194 195 #ifdef CONFIG_HIGHMEM 196 unsigned long v = __fix_to_virt(FIX_KMAP_END); 197 unsigned long end = __fix_to_virt(FIX_KMAP_BEGIN); 198 199 for (; v < end; v += PAGE_SIZE) 200 map_kernel_page(v, 0, __pgprot(0)); /* XXX gross */ 201 202 map_kernel_page(PKMAP_BASE, 0, __pgprot(0)); /* XXX gross */ 203 pkmap_page_table = virt_to_kpte(PKMAP_BASE); 204 #endif /* CONFIG_HIGHMEM */ 205 206 printk(KERN_DEBUG "Top of RAM: 0x%llx, Total RAM: 0x%llx\n", 207 (unsigned long long)top_of_ram, total_ram); 208 printk(KERN_DEBUG "Memory hole size: %ldMB\n", 209 (long int)((top_of_ram - total_ram) >> 20)); 210 211 /* 212 * Allow 30-bit DMA for very limited Broadcom wifi chips on many 213 * powerbooks. 214 */ 215 if (IS_ENABLED(CONFIG_PPC32)) 216 zone_dma_bits = 30; 217 else 218 zone_dma_bits = 31; 219 220 #ifdef CONFIG_ZONE_DMA 221 max_zone_pfns[ZONE_DMA] = min(max_low_pfn, 222 1UL << (zone_dma_bits - PAGE_SHIFT)); 223 #endif 224 max_zone_pfns[ZONE_NORMAL] = max_low_pfn; 225 #ifdef CONFIG_HIGHMEM 226 max_zone_pfns[ZONE_HIGHMEM] = max_pfn; 227 #endif 228 229 free_area_init(max_zone_pfns); 230 231 mark_nonram_nosave(); 232 } 233 234 void __init mem_init(void) 235 { 236 /* 237 * book3s is limited to 16 page sizes due to encoding this in 238 * a 4-bit field for slices. 239 */ 240 BUILD_BUG_ON(MMU_PAGE_COUNT > 16); 241 242 #ifdef CONFIG_SWIOTLB 243 /* 244 * Some platforms (e.g. 85xx) limit DMA-able memory way below 245 * 4G. We force memblock to bottom-up mode to ensure that the 246 * memory allocated in swiotlb_init() is DMA-able. 247 * As it's the last memblock allocation, no need to reset it 248 * back to to-down. 249 */ 250 memblock_set_bottom_up(true); 251 if (is_secure_guest()) 252 svm_swiotlb_init(); 253 else 254 swiotlb_init(0); 255 #endif 256 257 high_memory = (void *) __va(max_low_pfn * PAGE_SIZE); 258 set_max_mapnr(max_low_pfn); 259 260 kasan_late_init(); 261 262 memblock_free_all(); 263 264 #ifdef CONFIG_HIGHMEM 265 { 266 unsigned long pfn, highmem_mapnr; 267 268 highmem_mapnr = lowmem_end_addr >> PAGE_SHIFT; 269 for (pfn = highmem_mapnr; pfn < max_mapnr; ++pfn) { 270 phys_addr_t paddr = (phys_addr_t)pfn << PAGE_SHIFT; 271 struct page *page = pfn_to_page(pfn); 272 if (!memblock_is_reserved(paddr)) 273 free_highmem_page(page); 274 } 275 } 276 #endif /* CONFIG_HIGHMEM */ 277 278 #if defined(CONFIG_PPC_FSL_BOOK3E) && !defined(CONFIG_SMP) 279 /* 280 * If smp is enabled, next_tlbcam_idx is initialized in the cpu up 281 * functions.... do it here for the non-smp case. 282 */ 283 per_cpu(next_tlbcam_idx, smp_processor_id()) = 284 (mfspr(SPRN_TLB1CFG) & TLBnCFG_N_ENTRY) - 1; 285 #endif 286 287 #ifdef CONFIG_PPC32 288 pr_info("Kernel virtual memory layout:\n"); 289 #ifdef CONFIG_KASAN 290 pr_info(" * 0x%08lx..0x%08lx : kasan shadow mem\n", 291 KASAN_SHADOW_START, KASAN_SHADOW_END); 292 #endif 293 pr_info(" * 0x%08lx..0x%08lx : fixmap\n", FIXADDR_START, FIXADDR_TOP); 294 #ifdef CONFIG_HIGHMEM 295 pr_info(" * 0x%08lx..0x%08lx : highmem PTEs\n", 296 PKMAP_BASE, PKMAP_ADDR(LAST_PKMAP)); 297 #endif /* CONFIG_HIGHMEM */ 298 if (ioremap_bot != IOREMAP_TOP) 299 pr_info(" * 0x%08lx..0x%08lx : early ioremap\n", 300 ioremap_bot, IOREMAP_TOP); 301 pr_info(" * 0x%08lx..0x%08lx : vmalloc & ioremap\n", 302 VMALLOC_START, VMALLOC_END); 303 #ifdef MODULES_VADDR 304 pr_info(" * 0x%08lx..0x%08lx : modules\n", 305 MODULES_VADDR, MODULES_END); 306 #endif 307 #endif /* CONFIG_PPC32 */ 308 } 309 310 void free_initmem(void) 311 { 312 ppc_md.progress = ppc_printk_progress; 313 mark_initmem_nx(); 314 free_initmem_default(POISON_FREE_INITMEM); 315 } 316 317 /* 318 * System memory should not be in /proc/iomem but various tools expect it 319 * (eg kdump). 320 */ 321 static int __init add_system_ram_resources(void) 322 { 323 phys_addr_t start, end; 324 u64 i; 325 326 for_each_mem_range(i, &start, &end) { 327 struct resource *res; 328 329 res = kzalloc(sizeof(struct resource), GFP_KERNEL); 330 WARN_ON(!res); 331 332 if (res) { 333 res->name = "System RAM"; 334 res->start = start; 335 /* 336 * In memblock, end points to the first byte after 337 * the range while in resourses, end points to the 338 * last byte in the range. 339 */ 340 res->end = end - 1; 341 res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY; 342 WARN_ON(request_resource(&iomem_resource, res) < 0); 343 } 344 } 345 346 return 0; 347 } 348 subsys_initcall(add_system_ram_resources); 349 350 #ifdef CONFIG_STRICT_DEVMEM 351 /* 352 * devmem_is_allowed(): check to see if /dev/mem access to a certain address 353 * is valid. The argument is a physical page number. 354 * 355 * Access has to be given to non-kernel-ram areas as well, these contain the 356 * PCI mmio resources as well as potential bios/acpi data regions. 357 */ 358 int devmem_is_allowed(unsigned long pfn) 359 { 360 if (page_is_rtas_user_buf(pfn)) 361 return 1; 362 if (iomem_is_exclusive(PFN_PHYS(pfn))) 363 return 0; 364 if (!page_is_ram(pfn)) 365 return 1; 366 return 0; 367 } 368 #endif /* CONFIG_STRICT_DEVMEM */ 369 370 /* 371 * This is defined in kernel/resource.c but only powerpc needs to export it, for 372 * the EHEA driver. Drop this when drivers/net/ethernet/ibm/ehea is removed. 373 */ 374 EXPORT_SYMBOL_GPL(walk_system_ram_range); 375