xref: /linux/arch/powerpc/platforms/cell/spufs/lscsa_alloc.c (revision 75bf465f0bc33e9b776a46d6a1b9b990f5fb7c37)
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 
spu_alloc_lscsa(struct spu_state * csa)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 
spu_free_lscsa(struct spu_state * csa)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 }
51