2 * linux/arch/m68k/sun3/sun3dvma.c
4 * Copyright (C) 2000 Sam Creasey
6 * Contains common routines for sun3/sun3x DVMA management.
9 #include <linux/module.h>
10 #include <linux/kernel.h>
11 #include <linux/gfp.h>
13 #include <linux/list.h>
16 #include <asm/pgtable.h>
22 extern void dvma_unmap_iommu(unsigned long baddr, int len);
24 static inline void dvma_unmap_iommu(unsigned long a, int b)
30 extern void sun3_dvma_init(void);
33 static unsigned long iommu_use[IOMMU_TOTAL_ENTRIES];
35 #define dvma_index(baddr) ((baddr - DVMA_START) >> DVMA_PAGE_SHIFT)
37 #define dvma_entry_use(baddr) (iommu_use[dvma_index(baddr)])
43 struct list_head list;
46 static struct list_head hole_list;
47 static struct list_head hole_cache;
48 static struct hole initholes[64];
52 static unsigned long dvma_allocs;
53 static unsigned long dvma_frees;
54 static unsigned long long dvma_alloc_bytes;
55 static unsigned long long dvma_free_bytes;
57 static void print_use(void)
63 printk("dvma entry usage:\n");
65 for(i = 0; i < IOMMU_TOTAL_ENTRIES; i++) {
71 printk("dvma entry: %08lx len %08lx\n",
72 ( i << DVMA_PAGE_SHIFT) + DVMA_START,
76 printk("%d entries in use total\n", j);
78 printk("allocation/free calls: %lu/%lu\n", dvma_allocs, dvma_frees);
79 printk("allocation/free bytes: %Lx/%Lx\n", dvma_alloc_bytes,
83 static void print_holes(struct list_head *holes)
86 struct list_head *cur;
89 printk("listing dvma holes\n");
90 list_for_each(cur, holes) {
91 hole = list_entry(cur, struct hole, list);
93 if((hole->start == 0) && (hole->end == 0) && (hole->size == 0))
96 printk("hole: start %08lx end %08lx size %08lx\n", hole->start, hole->end, hole->size);
99 printk("end of hole listing...\n");
102 #endif /* DVMA_DEBUG */
104 static inline int refill(void)
108 struct hole *prev = NULL;
109 struct list_head *cur;
112 list_for_each(cur, &hole_list) {
113 hole = list_entry(cur, struct hole, list);
120 if(hole->end == prev->start) {
121 hole->size += prev->size;
122 hole->end = prev->end;
123 list_move(&(prev->list), &hole_cache);
132 static inline struct hole *rmcache(void)
136 if(list_empty(&hole_cache)) {
138 printk("out of dvma hole cache!\n");
143 ret = list_entry(hole_cache.next, struct hole, list);
144 list_del(&(ret->list));
150 static inline unsigned long get_baddr(int len, unsigned long align)
153 struct list_head *cur;
156 if(list_empty(&hole_list)) {
158 printk("out of dvma holes! (printing hole cache)\n");
159 print_holes(&hole_cache);
165 list_for_each(cur, &hole_list) {
166 unsigned long newlen;
168 hole = list_entry(cur, struct hole, list);
170 if(align > DVMA_PAGE_SIZE)
171 newlen = len + ((hole->end - len) & (align-1));
175 if(hole->size > newlen) {
177 hole->size -= newlen;
178 dvma_entry_use(hole->end) = newlen;
181 dvma_alloc_bytes += newlen;
184 } else if(hole->size == newlen) {
185 list_move(&(hole->list), &hole_cache);
186 dvma_entry_use(hole->start) = newlen;
189 dvma_alloc_bytes += newlen;
196 printk("unable to find dvma hole!\n");
201 static inline int free_baddr(unsigned long baddr)
206 struct list_head *cur;
207 unsigned long orig_baddr;
210 len = dvma_entry_use(baddr);
211 dvma_entry_use(baddr) = 0;
212 baddr &= DVMA_PAGE_MASK;
213 dvma_unmap_iommu(baddr, len);
217 dvma_free_bytes += len;
220 list_for_each(cur, &hole_list) {
221 hole = list_entry(cur, struct hole, list);
223 if(hole->end == baddr) {
227 } else if(hole->start == (baddr + len)) {
238 hole->end = baddr + len;
241 // list_add_tail(&(hole->list), cur);
242 list_add(&(hole->list), cur);
254 INIT_LIST_HEAD(&hole_list);
255 INIT_LIST_HEAD(&hole_cache);
257 /* prepare the hole cache */
258 for(i = 0; i < 64; i++)
259 list_add(&(initholes[i].list), &hole_cache);
262 hole->start = DVMA_START;
263 hole->end = DVMA_END;
264 hole->size = DVMA_SIZE;
266 list_add(&(hole->list), &hole_list);
268 memset(iommu_use, 0, sizeof(iommu_use));
270 dvma_unmap_iommu(DVMA_START, DVMA_SIZE);
278 inline unsigned long dvma_map_align(unsigned long kaddr, int len, int align)
288 // printk("error: kaddr %lx len %x\n", kaddr, len);
294 printk("dvma_map request %08lx bytes from %08lx\n",
297 off = kaddr & ~DVMA_PAGE_MASK;
300 len = ((len + (DVMA_PAGE_SIZE-1)) & DVMA_PAGE_MASK);
303 align = DVMA_PAGE_SIZE;
305 align = ((align + (DVMA_PAGE_SIZE-1)) & DVMA_PAGE_MASK);
307 baddr = get_baddr(len, align);
308 // printk("using baddr %lx\n", baddr);
310 if(!dvma_map_iommu(kaddr, baddr, len))
311 return (baddr + off);
313 printk("dvma_map failed kaddr %lx baddr %lx len %x\n", kaddr, baddr, len);
317 EXPORT_SYMBOL(dvma_map_align);
319 void dvma_unmap(void *baddr)
323 addr = (unsigned long)baddr;
324 /* check if this is a vme mapping */
325 if(!(addr & 0x00f00000))
333 EXPORT_SYMBOL(dvma_unmap);
335 void *dvma_malloc_align(unsigned long len, unsigned long align)
345 printk("dvma_malloc request %lx bytes\n", len);
347 len = ((len + (DVMA_PAGE_SIZE-1)) & DVMA_PAGE_MASK);
349 if((kaddr = __get_free_pages(GFP_ATOMIC, get_order(len))) == 0)
352 if((baddr = (unsigned long)dvma_map_align(kaddr, len, align)) == 0) {
353 free_pages(kaddr, get_order(len));
357 vaddr = dvma_btov(baddr);
359 if(dvma_map_cpu(kaddr, vaddr, len) < 0) {
360 dvma_unmap((void *)baddr);
361 free_pages(kaddr, get_order(len));
366 printk("mapped %08lx bytes %08lx kern -> %08lx bus\n",
370 return (void *)vaddr;
373 EXPORT_SYMBOL(dvma_malloc_align);
375 void dvma_free(void *vaddr)
381 EXPORT_SYMBOL(dvma_free);