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.execution_state = SPUCTX_UTIL_USER;
63 ctx->stats.tstamp = jiffies;
65 atomic_inc(&nr_spu_contexts);
74 void destroy_spu_context(struct kref *kref)
76 struct spu_context *ctx;
77 ctx = container_of(kref, struct spu_context, kref);
78 mutex_lock(&ctx->state_mutex);
80 mutex_unlock(&ctx->state_mutex);
81 spu_fini_csa(&ctx->csa);
83 spu_gang_remove_ctx(ctx->gang, ctx);
84 BUG_ON(!list_empty(&ctx->rq));
85 atomic_dec(&nr_spu_contexts);
89 struct spu_context * get_spu_context(struct spu_context *ctx)
95 int put_spu_context(struct spu_context *ctx)
97 return kref_put(&ctx->kref, &destroy_spu_context);
100 /* give up the mm reference when the context is about to be destroyed */
101 void spu_forget(struct spu_context *ctx)
103 struct mm_struct *mm;
104 spu_acquire_saved(ctx);
111 void spu_unmap_mappings(struct spu_context *ctx)
113 mutex_lock(&ctx->mapping_lock);
114 if (ctx->local_store)
115 unmap_mapping_range(ctx->local_store, 0, LS_SIZE, 1);
117 unmap_mapping_range(ctx->mfc, 0, 0x1000, 1);
119 unmap_mapping_range(ctx->cntl, 0, 0x1000, 1);
121 unmap_mapping_range(ctx->signal1, 0, PAGE_SIZE, 1);
123 unmap_mapping_range(ctx->signal2, 0, PAGE_SIZE, 1);
125 unmap_mapping_range(ctx->mss, 0, 0x1000, 1);
127 unmap_mapping_range(ctx->psmap, 0, 0x20000, 1);
128 mutex_unlock(&ctx->mapping_lock);
132 * spu_acquire_runnable - lock spu contex and make sure it is in runnable state
133 * @ctx: spu contex to lock
136 * Returns 0 and with the context locked on success
137 * Returns negative error and with the context _unlocked_ on failure.
139 int spu_acquire_runnable(struct spu_context *ctx, unsigned long flags)
144 if (ctx->state == SPU_STATE_SAVED) {
146 * Context is about to be freed, so we can't acquire it anymore.
150 ret = spu_activate(ctx, flags);
163 * spu_acquire_saved - lock spu contex and make sure it is in saved state
164 * @ctx: spu contex to lock
166 void spu_acquire_saved(struct spu_context *ctx)
169 if (ctx->state != SPU_STATE_SAVED)