Arnd Bergmann | 6263203 | 2006-10-04 17:26:15 +0200 | [diff] [blame] | 1 | /* |
| 2 | * SPU file system |
| 3 | * |
| 4 | * (C) Copyright IBM Deutschland Entwicklung GmbH 2005 |
| 5 | * |
| 6 | * Author: Arnd Bergmann <arndb@de.ibm.com> |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify |
| 9 | * it under the terms of the GNU General Public License as published by |
| 10 | * the Free Software Foundation; either version 2, or (at your option) |
| 11 | * any later version. |
| 12 | * |
| 13 | * This program is distributed in the hope that it will be useful, |
| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | * GNU General Public License for more details. |
| 17 | * |
| 18 | * You should have received a copy of the GNU General Public License |
| 19 | * along with this program; if not, write to the Free Software |
| 20 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| 21 | */ |
| 22 | |
| 23 | #include <linux/list.h> |
| 24 | #include <linux/slab.h> |
| 25 | |
| 26 | #include "spufs.h" |
| 27 | |
| 28 | struct spu_gang *alloc_spu_gang(void) |
| 29 | { |
| 30 | struct spu_gang *gang; |
| 31 | |
| 32 | gang = kzalloc(sizeof *gang, GFP_KERNEL); |
| 33 | if (!gang) |
| 34 | goto out; |
| 35 | |
| 36 | kref_init(&gang->kref); |
| 37 | mutex_init(&gang->mutex); |
Arnd Bergmann | 8e68e2f | 2007-07-20 21:39:47 +0200 | [diff] [blame] | 38 | mutex_init(&gang->aff_mutex); |
Arnd Bergmann | 6263203 | 2006-10-04 17:26:15 +0200 | [diff] [blame] | 39 | INIT_LIST_HEAD(&gang->list); |
Arnd Bergmann | 8e68e2f | 2007-07-20 21:39:47 +0200 | [diff] [blame] | 40 | INIT_LIST_HEAD(&gang->aff_list_head); |
Arnd Bergmann | 6263203 | 2006-10-04 17:26:15 +0200 | [diff] [blame] | 41 | |
| 42 | out: |
| 43 | return gang; |
| 44 | } |
| 45 | |
| 46 | static void destroy_spu_gang(struct kref *kref) |
| 47 | { |
| 48 | struct spu_gang *gang; |
| 49 | gang = container_of(kref, struct spu_gang, kref); |
| 50 | WARN_ON(gang->contexts || !list_empty(&gang->list)); |
| 51 | kfree(gang); |
| 52 | } |
| 53 | |
| 54 | struct spu_gang *get_spu_gang(struct spu_gang *gang) |
| 55 | { |
| 56 | kref_get(&gang->kref); |
| 57 | return gang; |
| 58 | } |
| 59 | |
| 60 | int put_spu_gang(struct spu_gang *gang) |
| 61 | { |
| 62 | return kref_put(&gang->kref, &destroy_spu_gang); |
| 63 | } |
| 64 | |
| 65 | void spu_gang_add_ctx(struct spu_gang *gang, struct spu_context *ctx) |
| 66 | { |
| 67 | mutex_lock(&gang->mutex); |
| 68 | ctx->gang = get_spu_gang(gang); |
| 69 | list_add(&ctx->gang_list, &gang->list); |
| 70 | gang->contexts++; |
| 71 | mutex_unlock(&gang->mutex); |
| 72 | } |
| 73 | |
| 74 | void spu_gang_remove_ctx(struct spu_gang *gang, struct spu_context *ctx) |
| 75 | { |
| 76 | mutex_lock(&gang->mutex); |
| 77 | WARN_ON(ctx->gang != gang); |
Arnd Bergmann | c5fc8d2 | 2007-07-20 21:39:48 +0200 | [diff] [blame] | 78 | if (!list_empty(&ctx->aff_list)) { |
Arnd Bergmann | 8e68e2f | 2007-07-20 21:39:47 +0200 | [diff] [blame] | 79 | list_del_init(&ctx->aff_list); |
Arnd Bergmann | c5fc8d2 | 2007-07-20 21:39:48 +0200 | [diff] [blame] | 80 | gang->aff_flags &= ~AFF_OFFSETS_SET; |
| 81 | } |
Arnd Bergmann | 6263203 | 2006-10-04 17:26:15 +0200 | [diff] [blame] | 82 | list_del_init(&ctx->gang_list); |
| 83 | gang->contexts--; |
| 84 | mutex_unlock(&gang->mutex); |
| 85 | |
| 86 | put_spu_gang(gang); |
| 87 | } |