2 * SPU file system -- SPU context management
4 * (C) Copyright IBM Deutschland Entwicklung GmbH 2005
6 * Author: Arnd Bergmann <arndb@de.ibm.com>
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)
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.
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.
25 #include <linux/module.h>
26 #include <linux/slab.h>
27 #include <asm/atomic.h>
29 #include <asm/spu_csa.h>
34 atomic_t nr_spu_contexts = ATOMIC_INIT(0);
36 struct spu_context *alloc_spu_context(struct spu_gang *gang)
38 struct spu_context *ctx;
41 ctx = kzalloc(sizeof *ctx, GFP_KERNEL);
44 /* Binding to physical processor deferred
45 * until spu_activate().
47 if (spu_init_csa(&ctx->csa))
49 spin_lock_init(&ctx->mmio_lock);
50 mutex_init(&ctx->mapping_lock);
51 kref_init(&ctx->kref);
52 mutex_init(&ctx->state_mutex);
53 mutex_init(&ctx->run_mutex);
54 init_waitqueue_head(&ctx->ibox_wq);
55 init_waitqueue_head(&ctx->wbox_wq);
56 init_waitqueue_head(&ctx->stop_wq);
57 init_waitqueue_head(&ctx->mfc_wq);
58 init_waitqueue_head(&ctx->run_wq);
59 ctx->state = SPU_STATE_SAVED;
60 ctx->ops = &spu_backing_ops;
61 ctx->owner = get_task_mm(current);
62 INIT_LIST_HEAD(&ctx->rq);
63 INIT_LIST_HEAD(&ctx->aff_list);
65 spu_gang_add_ctx(gang, ctx);
67 __spu_update_sched_info(ctx);
68 spu_set_timeslice(ctx);
69 ctx->stats.util_state = SPU_UTIL_IDLE_LOADED;
71 ctx->stats.tstamp = timespec_to_ns(&ts);
73 atomic_inc(&nr_spu_contexts);
82 void destroy_spu_context(struct kref *kref)
84 struct spu_context *ctx;
85 ctx = container_of(kref, struct spu_context, kref);
86 spu_context_nospu_trace(destroy_spu_context__enter, ctx);
87 mutex_lock(&ctx->state_mutex);
89 mutex_unlock(&ctx->state_mutex);
90 spu_fini_csa(&ctx->csa);
92 spu_gang_remove_ctx(ctx->gang, ctx);
93 if (ctx->prof_priv_kref)
94 kref_put(ctx->prof_priv_kref, ctx->prof_priv_release);
95 BUG_ON(!list_empty(&ctx->rq));
96 atomic_dec(&nr_spu_contexts);
97 kfree(ctx->switch_log);
101 struct spu_context * get_spu_context(struct spu_context *ctx)
103 kref_get(&ctx->kref);
107 int put_spu_context(struct spu_context *ctx)
109 return kref_put(&ctx->kref, &destroy_spu_context);
112 /* give up the mm reference when the context is about to be destroyed */
113 void spu_forget(struct spu_context *ctx)
115 struct mm_struct *mm;
118 * This is basically an open-coded spu_acquire_saved, except that
119 * we don't acquire the state mutex interruptible, and we don't
120 * want this context to be rescheduled on release.
122 mutex_lock(&ctx->state_mutex);
123 if (ctx->state != SPU_STATE_SAVED)
132 void spu_unmap_mappings(struct spu_context *ctx)
134 mutex_lock(&ctx->mapping_lock);
135 if (ctx->local_store)
136 unmap_mapping_range(ctx->local_store, 0, LS_SIZE, 1);
138 unmap_mapping_range(ctx->mfc, 0, SPUFS_MFC_MAP_SIZE, 1);
140 unmap_mapping_range(ctx->cntl, 0, SPUFS_CNTL_MAP_SIZE, 1);
142 unmap_mapping_range(ctx->signal1, 0, SPUFS_SIGNAL_MAP_SIZE, 1);
144 unmap_mapping_range(ctx->signal2, 0, SPUFS_SIGNAL_MAP_SIZE, 1);
146 unmap_mapping_range(ctx->mss, 0, SPUFS_MSS_MAP_SIZE, 1);
148 unmap_mapping_range(ctx->psmap, 0, SPUFS_PS_MAP_SIZE, 1);
149 mutex_unlock(&ctx->mapping_lock);
153 * spu_acquire_saved - lock spu contex and make sure it is in saved state
154 * @ctx: spu contex to lock
156 int spu_acquire_saved(struct spu_context *ctx)
160 spu_context_nospu_trace(spu_acquire_saved__enter, ctx);
162 ret = spu_acquire(ctx);
166 if (ctx->state != SPU_STATE_SAVED) {
167 set_bit(SPU_SCHED_WAS_ACTIVE, &ctx->sched_flags);
175 * spu_release_saved - unlock spu context and return it to the runqueue
176 * @ctx: context to unlock
178 void spu_release_saved(struct spu_context *ctx)
180 BUG_ON(ctx->state != SPU_STATE_SAVED);
182 if (test_and_clear_bit(SPU_SCHED_WAS_ACTIVE, &ctx->sched_flags) &&
183 test_bit(SPU_SCHED_SPU_RUN, &ctx->sched_flags))
184 spu_activate(ctx, 0);