root/drivers/isdn/teles/buffers.c

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DEFINITIONS

This source file includes following definitions.
  1. BufPoolInit
  2. BufPoolAdd
  3. BufPoolFree
  4. BufPoolGet
  5. BufPoolRelease
  6. BufQueueLink
  7. BufQueueLinkFront
  8. BufQueueUnlink
  9. BufQueueInit
  10. BufQueueRelease
  11. BufQueueLength
  12. BufQueueDiscard
  13. Sfree
  14. Smalloc

   1 #define __NO_VERSION__
   2 #include "teles.h"
   3 #include <linux/mm.h>
   4 #include <linux/malloc.h>
   5 
   6 
   7 void
   8 BufPoolInit(struct BufPool *bp, int order, int bpps,
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   9             int maxpages)
  10 {
  11 #ifdef DEBUG_MAGIC
  12         generateerror
  13             bp->magic = 010167;
  14 #endif
  15 
  16 #if 0
  17         printk(KERN_DEBUG "BufPoolInit bp %x\n", bp);
  18 #endif
  19 
  20         bp->freelist = NULL;
  21         bp->pageslist = NULL;
  22         bp->pageorder = order;
  23         bp->pagescount = 0;
  24         bp->bpps = bpps;
  25         bp->bufsize = BUFFER_SIZE(order, bpps);
  26         bp->maxpages = maxpages;
  27 }
  28 
  29 int
  30 BufPoolAdd(struct BufPool *bp, int priority)
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  31 {
  32         struct Pages   *ptr;
  33         long            flags;
  34         byte           *bptr;
  35         int             i;
  36         struct BufHeader *bh = NULL, *prev, *first;
  37 
  38 #if 0
  39         printk(KERN_DEBUG "BufPoolAdd bp %x\n", bp);
  40 #endif
  41 
  42         ptr = (struct Pages *) __get_free_pages(priority,bp->pageorder,0);
  43         if (!ptr) {
  44                 printk(KERN_WARNING "BufPoolAdd couldn't get pages!\n");
  45                 return (-1);
  46         }
  47 #if 0
  48         printk(KERN_DEBUG "Order %d pages allocated at %x\n", bp->pageorder, ptr);
  49 #endif
  50 
  51         ptr->next = bp->pageslist;
  52         bp->pageslist = ptr;
  53         bp->pagescount++;
  54 
  55         bptr = (byte *) ptr + sizeof(struct Pages *);
  56 
  57         i = bp->bpps;
  58         first = (struct BufHeader *) bptr;
  59         prev = NULL;
  60         while (i--) {
  61                 bh = (struct BufHeader *) bptr;
  62 #ifdef DEBUG_MAGIC
  63                 bh->magic = 020167;
  64 #endif
  65                 bh->next = prev;
  66                 prev = bh;
  67                 bh->bp = bp;
  68                 bptr += PART_SIZE(bp->pageorder, bp->bpps);
  69         }
  70 
  71         save_flags(flags);
  72         cli();
  73         first->next = bp->freelist;
  74         bp->freelist = bh;
  75         restore_flags(flags);
  76         return (0);
  77 }
  78 
  79 void
  80 BufPoolFree(struct BufPool *bp)
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  81 {
  82         struct Pages   *p;
  83 
  84 #if 0
  85         printk(KERN_DEBUG "BufPoolFree bp %x\n", bp);
  86 #endif
  87 
  88         while (bp->pagescount--) {
  89                 p = bp->pageslist->next;
  90                 free_pages((unsigned long) bp->pageslist, bp->pageorder);
  91 #if 0
  92                 printk(KERN_DEBUG "Free pages %x order %d\n", bp->pageslist, bp->pageorder);
  93 #endif
  94                 bp->pageslist = p;
  95         }
  96 }
  97 
  98 int
  99 BufPoolGet(struct BufHeader **bh,
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 100            struct BufPool *bp, int priority, void *heldby, int where)
 101 {
 102         long            flags;
 103         int             i;
 104 
 105 #ifdef DEBUG_MAGIC
 106         if (bp->magic != 010167) {
 107                 printk(KERN_DEBUG "BufPoolGet: not a BufHeader\n");
 108                 return (-1);
 109         }
 110 #endif
 111 
 112         save_flags(flags);
 113         cli();
 114         i = 0;
 115         while (!0) {
 116                 if (bp->freelist) {
 117                         *bh = bp->freelist;
 118                         bp->freelist = bp->freelist->next;
 119                         (*bh)->heldby = heldby;
 120                         (*bh)->where = where;
 121                         restore_flags(flags);
 122                         return (0);
 123                 }
 124                 if ((i == 0) && (bp->pagescount < bp->maxpages)) {
 125                         if (BufPoolAdd(bp, priority)) {
 126                                 restore_flags(flags);
 127                                 return -1;
 128                         }
 129                         i++;
 130                 } else {
 131                         *bh = NULL;
 132                         restore_flags(flags);
 133                         return (-1);
 134                 }
 135         }
 136 
 137 }
 138 
 139 void
 140 BufPoolRelease(struct BufHeader *bh)
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 141 {
 142         struct BufPool *bp;
 143         long            flags;
 144 
 145 #ifdef DEBUG_MAGIC
 146         if (bh->magic != 020167) {
 147                 printk(KERN_DEBUG "BufPoolRelease: not a BufHeader\n");
 148                 printk(KERN_DEBUG "called from %x\n", __builtin_return_address(0));
 149                 return;
 150         }
 151 #endif
 152 
 153         bp = bh->bp;
 154 
 155 #ifdef DEBUG_MAGIC
 156         if (bp->magic != 010167) {
 157                 printk(KERN_DEBUG "BufPoolRelease: not a BufPool\n");
 158                 return;
 159         }
 160 #endif
 161 
 162         save_flags(flags);
 163         cli();
 164         bh->next = bp->freelist;
 165         bp->freelist = bh;
 166         restore_flags(flags);
 167 }
 168 
 169 void
 170 BufQueueLink(struct BufQueue *bq,
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 171              struct BufHeader *bh)
 172 {
 173         unsigned long   flags;
 174 
 175         save_flags(flags);
 176         cli();
 177         if (!bq->head)
 178                 bq->head = bh;
 179         if (bq->tail)
 180                 bq->tail->next = bh;
 181         bq->tail = bh;
 182         bh->next = NULL;
 183         restore_flags(flags);
 184 }
 185 
 186 void
 187 BufQueueLinkFront(struct BufQueue *bq,
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 188                   struct BufHeader *bh)
 189 {
 190         unsigned long   flags;
 191 
 192         save_flags(flags);
 193         cli();
 194         bh->next = bq->head;
 195         bq->head = bh;
 196         if (!bq->tail)
 197                 bq->tail = bh;
 198         restore_flags(flags);
 199 }
 200 
 201 int
 202 BufQueueUnlink(struct BufHeader **bh, struct BufQueue *bq)
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 203 {
 204         long            flags;
 205 
 206         save_flags(flags);
 207         cli();
 208 
 209         if (bq->head) {
 210                 if (bq->tail == bq->head)
 211                         bq->tail = NULL;
 212                 *bh = bq->head;
 213                 bq->head = (*bh)->next;
 214                 restore_flags(flags);
 215                 return (0);
 216         } else {
 217                 restore_flags(flags);
 218                 return (-1);
 219         }
 220 }
 221 
 222 void
 223 BufQueueInit(struct BufQueue *bq)
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 224 {
 225 #ifdef DEBUG_MAGIC
 226         bq->magic = 030167;
 227 #endif
 228         bq->head = NULL;
 229         bq->tail = NULL;
 230 }
 231 
 232 void
 233 BufQueueRelease(struct BufQueue *bq)
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 234 {
 235         struct BufHeader *bh;
 236 
 237         while (bq->head) {
 238                 BufQueueUnlink(&bh, bq);
 239                 BufPoolRelease(bh);
 240         }
 241 }
 242 
 243 int
 244 BufQueueLength(struct BufQueue *bq)
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 245 {
 246         int             i = 0;
 247         struct BufHeader *bh;
 248 
 249         bh = bq->head;
 250         while (bh) {
 251                 i++;
 252                 bh = bh->next;
 253         }
 254         return (i);
 255 }
 256 
 257 void
 258 BufQueueDiscard(struct BufQueue *q, int pr, void *heldby,
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 259                 int releasetoo)
 260 {
 261         long            flags;
 262         struct BufHeader *sp;
 263 
 264         save_flags(flags);
 265         cli();
 266 
 267         while (!0) {
 268                 sp = q->head;
 269                 if (!sp)
 270                         break;
 271                 if ((sp->primitive == pr) && (sp->heldby == heldby)) {
 272                         q->head = sp->next;
 273                         if (q->tail == sp)
 274                                 q->tail = NULL;
 275                         if (releasetoo)
 276                                 BufPoolRelease(sp);
 277                 } else
 278                         break;
 279         }
 280 
 281         sp = q->head;
 282         if (sp)
 283                 while (sp->next) {
 284                         if ((sp->next->primitive == pr) && (sp->next->heldby == heldby)) {
 285                                 if (q->tail == sp->next)
 286                                         q->tail = sp;
 287                                 if (releasetoo)
 288                                         BufPoolRelease(sp->next);
 289                                 sp->next = sp->next->next;
 290                         } else
 291                                 sp = sp->next;
 292                 }
 293         restore_flags(flags);
 294 }
 295 
 296 void
 297 Sfree(byte * ptr)
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 298 {
 299 #if 0
 300         printk(KERN_DEBUG "Sfree %x\n", ptr);
 301 #endif
 302         kfree(ptr);
 303 }
 304 
 305 byte           *
 306 Smalloc(int size, int pr, char *why)
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 307 {
 308         byte           *p;
 309 
 310         p = (byte *) kmalloc(size, pr);
 311 #if 0
 312         printk(KERN_DEBUG "Smalloc %s size %d res %x\n", why, size, p);
 313 #endif
 314         return (p);
 315 }

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