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