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/slab.h>
26 #include <linux/atomic.h>
27 #include <linux/sched.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;
40 ctx = kzalloc(sizeof *ctx, GFP_KERNEL);
43 /* Binding to physical processor deferred
44 * until spu_activate().
46 if (spu_init_csa(&ctx->csa))
48 spin_lock_init(&ctx->mmio_lock);
49 mutex_init(&ctx->mapping_lock);
50 kref_init(&ctx->kref);
51 mutex_init(&ctx->state_mutex);
52 mutex_init(&ctx->run_mutex);
53 init_waitqueue_head(&ctx->ibox_wq);
54 init_waitqueue_head(&ctx->wbox_wq);
55 init_waitqueue_head(&ctx->stop_wq);
56 init_waitqueue_head(&ctx->mfc_wq);
57 init_waitqueue_head(&ctx->run_wq);
58 ctx->state = SPU_STATE_SAVED;
59 ctx->ops = &spu_backing_ops;
60 ctx->owner = get_task_mm(current);
61 INIT_LIST_HEAD(&ctx->rq);
62 INIT_LIST_HEAD(&ctx->aff_list);
64 spu_gang_add_ctx(gang, ctx);
66 __spu_update_sched_info(ctx);
67 spu_set_timeslice(ctx);
68 ctx->stats.util_state = SPU_UTIL_IDLE_LOADED;
69 ctx->stats.tstamp = ktime_get_ns();
71 atomic_inc(&nr_spu_contexts);
80 void destroy_spu_context(struct kref *kref)
82 struct spu_context *ctx;
83 ctx = container_of(kref, struct spu_context, kref);
84 spu_context_nospu_trace(destroy_spu_context__enter, ctx);
85 mutex_lock(&ctx->state_mutex);
87 mutex_unlock(&ctx->state_mutex);
88 spu_fini_csa(&ctx->csa);
90 spu_gang_remove_ctx(ctx->gang, ctx);
91 if (ctx->prof_priv_kref)
92 kref_put(ctx->prof_priv_kref, ctx->prof_priv_release);
93 BUG_ON(!list_empty(&ctx->rq));
94 atomic_dec(&nr_spu_contexts);
95 kfree(ctx->switch_log);
99 struct spu_context * get_spu_context(struct spu_context *ctx)
101 kref_get(&ctx->kref);
105 int put_spu_context(struct spu_context *ctx)
107 return kref_put(&ctx->kref, &destroy_spu_context);
110 /* give up the mm reference when the context is about to be destroyed */
111 void spu_forget(struct spu_context *ctx)
113 struct mm_struct *mm;
116 * This is basically an open-coded spu_acquire_saved, except that
117 * we don't acquire the state mutex interruptible, and we don't
118 * want this context to be rescheduled on release.
120 mutex_lock(&ctx->state_mutex);
121 if (ctx->state != SPU_STATE_SAVED)
130 void spu_unmap_mappings(struct spu_context *ctx)
132 mutex_lock(&ctx->mapping_lock);
133 if (ctx->local_store)
134 unmap_mapping_range(ctx->local_store, 0, LS_SIZE, 1);
136 unmap_mapping_range(ctx->mfc, 0, SPUFS_MFC_MAP_SIZE, 1);
138 unmap_mapping_range(ctx->cntl, 0, SPUFS_CNTL_MAP_SIZE, 1);
140 unmap_mapping_range(ctx->signal1, 0, SPUFS_SIGNAL_MAP_SIZE, 1);
142 unmap_mapping_range(ctx->signal2, 0, SPUFS_SIGNAL_MAP_SIZE, 1);
144 unmap_mapping_range(ctx->mss, 0, SPUFS_MSS_MAP_SIZE, 1);
146 unmap_mapping_range(ctx->psmap, 0, SPUFS_PS_MAP_SIZE, 1);
147 mutex_unlock(&ctx->mapping_lock);
151 * spu_acquire_saved - lock spu contex and make sure it is in saved state
152 * @ctx: spu contex to lock
154 int spu_acquire_saved(struct spu_context *ctx)
158 spu_context_nospu_trace(spu_acquire_saved__enter, ctx);
160 ret = spu_acquire(ctx);
164 if (ctx->state != SPU_STATE_SAVED) {
165 set_bit(SPU_SCHED_WAS_ACTIVE, &ctx->sched_flags);
173 * spu_release_saved - unlock spu context and return it to the runqueue
174 * @ctx: context to unlock
176 void spu_release_saved(struct spu_context *ctx)
178 BUG_ON(ctx->state != SPU_STATE_SAVED);
180 if (test_and_clear_bit(SPU_SCHED_WAS_ACTIVE, &ctx->sched_flags) &&
181 test_bit(SPU_SCHED_SPU_RUN, &ctx->sched_flags))
182 spu_activate(ctx, 0);