1 /* 2 * linux/arch/m68k/sun3/sun3dvma.c 3 * 4 * Copyright (C) 2000 Sam Creasey 5 * 6 * Contains common routines for sun3/sun3x DVMA management. 7 */ 8 9 #include <linux/bootmem.h> 10 #include <linux/init.h> 11 #include <linux/module.h> 12 #include <linux/kernel.h> 13 #include <linux/gfp.h> 14 #include <linux/mm.h> 15 #include <linux/list.h> 16 17 #include <asm/page.h> 18 #include <asm/pgtable.h> 19 #include <asm/dvma.h> 20 21 #undef DVMA_DEBUG 22 23 #ifdef CONFIG_SUN3X 24 extern void dvma_unmap_iommu(unsigned long baddr, int len); 25 #else 26 static inline void dvma_unmap_iommu(unsigned long a, int b) 27 { 28 } 29 #endif 30 31 #ifdef CONFIG_SUN3 32 extern void sun3_dvma_init(void); 33 #endif 34 35 static unsigned long *iommu_use; 36 37 #define dvma_index(baddr) ((baddr - DVMA_START) >> DVMA_PAGE_SHIFT) 38 39 #define dvma_entry_use(baddr) (iommu_use[dvma_index(baddr)]) 40 41 struct hole { 42 unsigned long start; 43 unsigned long end; 44 unsigned long size; 45 struct list_head list; 46 }; 47 48 static struct list_head hole_list; 49 static struct list_head hole_cache; 50 static struct hole initholes[64]; 51 52 #ifdef DVMA_DEBUG 53 54 static unsigned long dvma_allocs; 55 static unsigned long dvma_frees; 56 static unsigned long long dvma_alloc_bytes; 57 static unsigned long long dvma_free_bytes; 58 59 static void print_use(void) 60 { 61 62 int i; 63 int j = 0; 64 65 pr_info("dvma entry usage:\n"); 66 67 for(i = 0; i < IOMMU_TOTAL_ENTRIES; i++) { 68 if(!iommu_use[i]) 69 continue; 70 71 j++; 72 73 pr_info("dvma entry: %08x len %08lx\n", 74 (i << DVMA_PAGE_SHIFT) + DVMA_START, iommu_use[i]); 75 } 76 77 pr_info("%d entries in use total\n", j); 78 79 pr_info("allocation/free calls: %lu/%lu\n", dvma_allocs, dvma_frees); 80 pr_info("allocation/free bytes: %Lx/%Lx\n", dvma_alloc_bytes, 81 dvma_free_bytes); 82 } 83 84 static void print_holes(struct list_head *holes) 85 { 86 87 struct list_head *cur; 88 struct hole *hole; 89 90 pr_info("listing dvma holes\n"); 91 list_for_each(cur, holes) { 92 hole = list_entry(cur, struct hole, list); 93 94 if((hole->start == 0) && (hole->end == 0) && (hole->size == 0)) 95 continue; 96 97 pr_info("hole: start %08lx end %08lx size %08lx\n", 98 hole->start, hole->end, hole->size); 99 } 100 101 pr_info("end of hole listing...\n"); 102 } 103 #endif /* DVMA_DEBUG */ 104 105 static inline int refill(void) 106 { 107 108 struct hole *hole; 109 struct hole *prev = NULL; 110 struct list_head *cur; 111 int ret = 0; 112 113 list_for_each(cur, &hole_list) { 114 hole = list_entry(cur, struct hole, list); 115 116 if(!prev) { 117 prev = hole; 118 continue; 119 } 120 121 if(hole->end == prev->start) { 122 hole->size += prev->size; 123 hole->end = prev->end; 124 list_move(&(prev->list), &hole_cache); 125 ret++; 126 } 127 128 } 129 130 return ret; 131 } 132 133 static inline struct hole *rmcache(void) 134 { 135 struct hole *ret; 136 137 if(list_empty(&hole_cache)) { 138 if(!refill()) { 139 pr_crit("out of dvma hole cache!\n"); 140 BUG(); 141 } 142 } 143 144 ret = list_entry(hole_cache.next, struct hole, list); 145 list_del(&(ret->list)); 146 147 return ret; 148 149 } 150 151 static inline unsigned long get_baddr(int len, unsigned long align) 152 { 153 154 struct list_head *cur; 155 struct hole *hole; 156 157 if(list_empty(&hole_list)) { 158 #ifdef DVMA_DEBUG 159 pr_crit("out of dvma holes! (printing hole cache)\n"); 160 print_holes(&hole_cache); 161 print_use(); 162 #endif 163 BUG(); 164 } 165 166 list_for_each(cur, &hole_list) { 167 unsigned long newlen; 168 169 hole = list_entry(cur, struct hole, list); 170 171 if(align > DVMA_PAGE_SIZE) 172 newlen = len + ((hole->end - len) & (align-1)); 173 else 174 newlen = len; 175 176 if(hole->size > newlen) { 177 hole->end -= newlen; 178 hole->size -= newlen; 179 dvma_entry_use(hole->end) = newlen; 180 #ifdef DVMA_DEBUG 181 dvma_allocs++; 182 dvma_alloc_bytes += newlen; 183 #endif 184 return hole->end; 185 } else if(hole->size == newlen) { 186 list_move(&(hole->list), &hole_cache); 187 dvma_entry_use(hole->start) = newlen; 188 #ifdef DVMA_DEBUG 189 dvma_allocs++; 190 dvma_alloc_bytes += newlen; 191 #endif 192 return hole->start; 193 } 194 195 } 196 197 pr_crit("unable to find dvma hole!\n"); 198 BUG(); 199 return 0; 200 } 201 202 static inline int free_baddr(unsigned long baddr) 203 { 204 205 unsigned long len; 206 struct hole *hole; 207 struct list_head *cur; 208 unsigned long orig_baddr; 209 210 orig_baddr = baddr; 211 len = dvma_entry_use(baddr); 212 dvma_entry_use(baddr) = 0; 213 baddr &= DVMA_PAGE_MASK; 214 dvma_unmap_iommu(baddr, len); 215 216 #ifdef DVMA_DEBUG 217 dvma_frees++; 218 dvma_free_bytes += len; 219 #endif 220 221 list_for_each(cur, &hole_list) { 222 hole = list_entry(cur, struct hole, list); 223 224 if(hole->end == baddr) { 225 hole->end += len; 226 hole->size += len; 227 return 0; 228 } else if(hole->start == (baddr + len)) { 229 hole->start = baddr; 230 hole->size += len; 231 return 0; 232 } 233 234 } 235 236 hole = rmcache(); 237 238 hole->start = baddr; 239 hole->end = baddr + len; 240 hole->size = len; 241 242 // list_add_tail(&(hole->list), cur); 243 list_add(&(hole->list), cur); 244 245 return 0; 246 247 } 248 249 void __init dvma_init(void) 250 { 251 252 struct hole *hole; 253 int i; 254 255 INIT_LIST_HEAD(&hole_list); 256 INIT_LIST_HEAD(&hole_cache); 257 258 /* prepare the hole cache */ 259 for(i = 0; i < 64; i++) 260 list_add(&(initholes[i].list), &hole_cache); 261 262 hole = rmcache(); 263 hole->start = DVMA_START; 264 hole->end = DVMA_END; 265 hole->size = DVMA_SIZE; 266 267 list_add(&(hole->list), &hole_list); 268 269 iommu_use = alloc_bootmem(IOMMU_TOTAL_ENTRIES * sizeof(unsigned long)); 270 271 dvma_unmap_iommu(DVMA_START, DVMA_SIZE); 272 273 #ifdef CONFIG_SUN3 274 sun3_dvma_init(); 275 #endif 276 277 } 278 279 unsigned long dvma_map_align(unsigned long kaddr, int len, int align) 280 { 281 282 unsigned long baddr; 283 unsigned long off; 284 285 if(!len) 286 len = 0x800; 287 288 if(!kaddr || !len) { 289 // pr_err("error: kaddr %lx len %x\n", kaddr, len); 290 // *(int *)4 = 0; 291 return 0; 292 } 293 294 pr_debug("dvma_map request %08x bytes from %08lx\n", len, kaddr); 295 off = kaddr & ~DVMA_PAGE_MASK; 296 kaddr &= PAGE_MASK; 297 len += off; 298 len = ((len + (DVMA_PAGE_SIZE-1)) & DVMA_PAGE_MASK); 299 300 if(align == 0) 301 align = DVMA_PAGE_SIZE; 302 else 303 align = ((align + (DVMA_PAGE_SIZE-1)) & DVMA_PAGE_MASK); 304 305 baddr = get_baddr(len, align); 306 // pr_info("using baddr %lx\n", baddr); 307 308 if(!dvma_map_iommu(kaddr, baddr, len)) 309 return (baddr + off); 310 311 pr_crit("dvma_map failed kaddr %lx baddr %lx len %x\n", kaddr, baddr, 312 len); 313 BUG(); 314 return 0; 315 } 316 EXPORT_SYMBOL(dvma_map_align); 317 318 void dvma_unmap(void *baddr) 319 { 320 unsigned long addr; 321 322 addr = (unsigned long)baddr; 323 /* check if this is a vme mapping */ 324 if(!(addr & 0x00f00000)) 325 addr |= 0xf00000; 326 327 free_baddr(addr); 328 329 return; 330 331 } 332 EXPORT_SYMBOL(dvma_unmap); 333 334 void *dvma_malloc_align(unsigned long len, unsigned long align) 335 { 336 unsigned long kaddr; 337 unsigned long baddr; 338 unsigned long vaddr; 339 340 if(!len) 341 return NULL; 342 343 pr_debug("dvma_malloc request %lx bytes\n", len); 344 len = ((len + (DVMA_PAGE_SIZE-1)) & DVMA_PAGE_MASK); 345 346 if((kaddr = __get_free_pages(GFP_ATOMIC, get_order(len))) == 0) 347 return NULL; 348 349 if((baddr = (unsigned long)dvma_map_align(kaddr, len, align)) == 0) { 350 free_pages(kaddr, get_order(len)); 351 return NULL; 352 } 353 354 vaddr = dvma_btov(baddr); 355 356 if(dvma_map_cpu(kaddr, vaddr, len) < 0) { 357 dvma_unmap((void *)baddr); 358 free_pages(kaddr, get_order(len)); 359 return NULL; 360 } 361 362 pr_debug("mapped %08lx bytes %08lx kern -> %08lx bus\n", len, kaddr, 363 baddr); 364 365 return (void *)vaddr; 366 367 } 368 EXPORT_SYMBOL(dvma_malloc_align); 369 370 void dvma_free(void *vaddr) 371 { 372 373 return; 374 375 } 376 EXPORT_SYMBOL(dvma_free); 377