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(*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 } 64