root/arch/powerpc/platforms/cell/spufs/gang.c

DEFINITIONS

1. alloc_spu_gang
2. destroy_spu_gang
3. get_spu_gang
4. put_spu_gang
5. spu_gang_add_ctx
6. spu_gang_remove_ctx

   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(sizeof *gang, GFP_KERNEL);
  20         if (!gang)
  21                 goto out;
  22 
  23         kref_init(&gang->kref);
  24         mutex_init(&gang->mutex);
  25         mutex_init(&gang->aff_mutex);
  26         INIT_LIST_HEAD(&gang->list);
  27         INIT_LIST_HEAD(&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(gang);
  39 }
  40 
  41 struct spu_gang *get_spu_gang(struct spu_gang *gang)
  42 {
  43         kref_get(&gang->kref);
  44         return gang;
  45 }
  46 
  47 int put_spu_gang(struct spu_gang *gang)
  48 {
  49         return kref_put(&gang->kref, &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(&ctx->gang_list, &gang->list);
  57         gang->contexts++;
  58         mutex_unlock(&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(&ctx->aff_list)) {
  66                 list_del_init(&ctx->aff_list);
  67                 gang->aff_flags &= ~AFF_OFFSETS_SET;
  68         }
  69         list_del_init(&ctx->gang_list);
  70         gang->contexts--;
  71         mutex_unlock(&gang->mutex);
  72 
  73         put_spu_gang(gang);
  74 }