arch/powerpc/platforms/cell/spufs/lscsa_alloc.c

   1 /*
   2  * SPU local store allocation routines
   3  *
   4  * Copyright 2007 Benjamin Herrenschmidt, IBM Corp.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2, or (at your option)
   9  * any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19  */
  20
  21 #undef DEBUG
  22
  23 #include <linux/kernel.h>
  24 #include <linux/mm.h>
  25 #include <linux/slab.h>
  26 #include <linux/vmalloc.h>
  27
  28 #include <asm/spu.h>
  29 #include <asm/spu_csa.h>
  30 #include <asm/mmu.h>
  31
  32 #include "spufs.h"
  33
  34 int spu_alloc_lscsa(struct spu_state *csa)
  35 {
  36         struct spu_lscsa *lscsa;
  37         unsigned char *p;
  38
  39         lscsa = vzalloc(sizeof(struct spu_lscsa));
  40         if (!lscsa)
  41                 return -ENOMEM;
  42         csa->lscsa = lscsa;
  43
  44         /* Set LS pages reserved to allow for user-space mapping. */
  45         for (p = lscsa->ls; p < lscsa->ls + LS_SIZE; p += PAGE_SIZE)
  46                 SetPageReserved(vmalloc_to_page(p));
  47
  48         return 0;
  49 }
  50
  51 void spu_free_lscsa(struct spu_state *csa)
  52 {
  53         /* Clear reserved bit before vfree. */
  54         unsigned char *p;
  55
  56         if (csa->lscsa == NULL)
  57                 return;
  58
  59         for (p = csa->lscsa->ls; p < csa->lscsa->ls + LS_SIZE; p += PAGE_SIZE)
  60                 ClearPageReserved(vmalloc_to_page(p));
  61
  62         vfree(csa->lscsa);
  63 }