| 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
|---|---|
| 2 | /* |
| 3 | * SPU file system |
| 4 | * |
| 5 | * (C) Copyright IBM Deutschland Entwicklung GmbH 2005 |
| 6 | * |
| 7 | * Author: Arnd Bergmann <arndb@de.ibm.com> |
| 8 | */ |
| 9 | |
| 10 | #include <linux/list.h> |
| 11 | #include <linux/slab.h> |
| 12 | |
| 13 | #include "spufs.h" |
| 14 | |
| 15 | struct spu_gang *alloc_spu_gang(void) |
| 16 | { |
| 17 | struct spu_gang *gang; |
| 18 | |
| 19 | gang = kzalloc(size: sizeof *gang, GFP_KERNEL); |
| 20 | if (!gang) |
| 21 | goto out; |
| 22 | |
| 23 | kref_init(kref: &gang->kref); |
| 24 | mutex_init(&gang->mutex); |
| 25 | mutex_init(&gang->aff_mutex); |
| 26 | INIT_LIST_HEAD(list: &gang->list); |
| 27 | INIT_LIST_HEAD(list: &gang->aff_list_head); |
| 28 | |
| 29 | out: |
| 30 | return gang; |
| 31 | } |
| 32 | |
| 33 | static void destroy_spu_gang(struct kref *kref) |
| 34 | { |
| 35 | struct spu_gang *gang; |
| 36 | gang = container_of(kref, struct spu_gang, kref); |
| 37 | WARN_ON(gang->contexts || !list_empty(&gang->list)); |
| 38 | kfree(objp: gang); |
| 39 | } |
| 40 | |
| 41 | struct spu_gang *get_spu_gang(struct spu_gang *gang) |
| 42 | { |
| 43 | kref_get(kref: &gang->kref); |
| 44 | return gang; |
| 45 | } |
| 46 | |
| 47 | int put_spu_gang(struct spu_gang *gang) |
| 48 | { |
| 49 | return kref_put(kref: &gang->kref, release: &destroy_spu_gang); |
| 50 | } |
| 51 | |
| 52 | void spu_gang_add_ctx(struct spu_gang *gang, struct spu_context *ctx) |
| 53 | { |
| 54 | mutex_lock(&gang->mutex); |
| 55 | ctx->gang = get_spu_gang(gang); |
| 56 | list_add(new: &ctx->gang_list, head: &gang->list); |
| 57 | gang->contexts++; |
| 58 | mutex_unlock(lock: &gang->mutex); |
| 59 | } |
| 60 | |
| 61 | void spu_gang_remove_ctx(struct spu_gang *gang, struct spu_context *ctx) |
| 62 | { |
| 63 | mutex_lock(&gang->mutex); |
| 64 | WARN_ON(ctx->gang != gang); |
| 65 | if (!list_empty(head: &ctx->aff_list)) { |
| 66 | list_del_init(entry: &ctx->aff_list); |
| 67 | gang->aff_flags &= ~AFF_OFFSETS_SET; |
| 68 | } |
| 69 | list_del_init(entry: &ctx->gang_list); |
| 70 | gang->contexts--; |
| 71 | mutex_unlock(lock: &gang->mutex); |
| 72 | |
| 73 | put_spu_gang(gang); |
| 74 | } |
| 75 |