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

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * SPU local store allocation routines
   4  *
   5  * Copyright 2007 Benjamin Herrenschmidt, IBM Corp.
   6  */
   7
   8 #undef DEBUG
   9
  10 #include <linux/kernel.h>
  11 #include <linux/mm.h>
  12 #include <linux/slab.h>
  13 #include <linux/vmalloc.h>
  14
  15 #include <asm/spu.h>
  16 #include <asm/spu_csa.h>
  17 #include <asm/mmu.h>
  18
  19 #include "spufs.h"
  20
  21 int spu_alloc_lscsa(struct spu_state *csa)
  22 {
  23         struct spu_lscsa *lscsa;
  24         unsigned char *p;
  25
  26         lscsa = vzalloc(sizeof(*lscsa));
  27         if (!lscsa)
  28                 return -ENOMEM;
  29         csa->lscsa = lscsa;
  30
  31         /* Set LS pages reserved to allow for user-space mapping. */
  32         for (p = lscsa->ls; p < lscsa->ls + LS_SIZE; p += PAGE_SIZE)
  33                 SetPageReserved(vmalloc_to_page(p));
  34
  35         return 0;
  36 }
  37
  38 void spu_free_lscsa(struct spu_state *csa)
  39 {
  40         /* Clear reserved bit before vfree. */
  41         unsigned char *p;
  42
  43         if (csa->lscsa == NULL)
  44                 return;
  45
  46         for (p = csa->lscsa->ls; p < csa->lscsa->ls + LS_SIZE; p += PAGE_SIZE)
  47                 ClearPageReserved(vmalloc_to_page(p));
  48
  49         vfree(csa->lscsa);
  50 }