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 <asm/atomic.h>
28 #include <asm/spu_csa.h>
32 atomic_t nr_spu_contexts = ATOMIC_INIT(0);
34 struct spu_context *alloc_spu_context(struct spu_gang *gang)
36 struct spu_context *ctx;
37 ctx = kzalloc(sizeof *ctx, GFP_KERNEL);
40 /* Binding to physical processor deferred
41 * until spu_activate().
43 if (spu_init_csa(&ctx->csa))
45 spin_lock_init(&ctx->mmio_lock);
46 mutex_init(&ctx->mapping_lock);
47 kref_init(&ctx->kref);
48 mutex_init(&ctx->state_mutex);
49 mutex_init(&ctx->run_mutex);
50 init_waitqueue_head(&ctx->ibox_wq);
51 init_waitqueue_head(&ctx->wbox_wq);
52 init_waitqueue_head(&ctx->stop_wq);
53 init_waitqueue_head(&ctx->mfc_wq);
54 ctx->state = SPU_STATE_SAVED;
55 ctx->ops = &spu_backing_ops;
56 ctx->owner = get_task_mm(current);
57 INIT_LIST_HEAD(&ctx->rq);
59 spu_gang_add_ctx(gang, ctx);
60 ctx->cpus_allowed = current->cpus_allowed;
61 spu_set_timeslice(ctx);
62 ctx->stats.util_state = SPU_UTIL_IDLE_LOADED;
64 atomic_inc(&nr_spu_contexts);
73 void destroy_spu_context(struct kref *kref)
75 struct spu_context *ctx;
76 ctx = container_of(kref, struct spu_context, kref);
77 mutex_lock(&ctx->state_mutex);
79 mutex_unlock(&ctx->state_mutex);
80 spu_fini_csa(&ctx->csa);
82 spu_gang_remove_ctx(ctx->gang, ctx);
83 BUG_ON(!list_empty(&ctx->rq));
84 atomic_dec(&nr_spu_contexts);
88 struct spu_context * get_spu_context(struct spu_context *ctx)
94 int put_spu_context(struct spu_context *ctx)
96 return kref_put(&ctx->kref, &destroy_spu_context);
99 /* give up the mm reference when the context is about to be destroyed */
100 void spu_forget(struct spu_context *ctx)
102 struct mm_struct *mm;
103 spu_acquire_saved(ctx);
110 void spu_unmap_mappings(struct spu_context *ctx)
112 mutex_lock(&ctx->mapping_lock);
113 if (ctx->local_store)
114 unmap_mapping_range(ctx->local_store, 0, LS_SIZE, 1);
116 unmap_mapping_range(ctx->mfc, 0, 0x1000, 1);
118 unmap_mapping_range(ctx->cntl, 0, 0x1000, 1);
120 unmap_mapping_range(ctx->signal1, 0, PAGE_SIZE, 1);
122 unmap_mapping_range(ctx->signal2, 0, PAGE_SIZE, 1);
124 unmap_mapping_range(ctx->mss, 0, 0x1000, 1);
126 unmap_mapping_range(ctx->psmap, 0, 0x20000, 1);
127 mutex_unlock(&ctx->mapping_lock);
131 * spu_acquire_runnable - lock spu contex and make sure it is in runnable state
132 * @ctx: spu contex to lock
135 * Returns 0 and with the context locked on success
136 * Returns negative error and with the context _unlocked_ on failure.
138 int spu_acquire_runnable(struct spu_context *ctx, unsigned long flags)
143 if (ctx->state == SPU_STATE_SAVED) {
145 * Context is about to be freed, so we can't acquire it anymore.
149 ret = spu_activate(ctx, flags);
162 * spu_acquire_saved - lock spu contex and make sure it is in saved state
163 * @ctx: spu contex to lock
165 void spu_acquire_saved(struct spu_context *ctx)
168 if (ctx->state != SPU_STATE_SAVED)