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>
33 atomic_t nr_spu_contexts
= ATOMIC_INIT(0);
35 struct spu_context
*alloc_spu_context(struct spu_gang
*gang
)
37 struct spu_context
*ctx
;
38 ctx
= kzalloc(sizeof *ctx
, GFP_KERNEL
);
41 /* Binding to physical processor deferred
42 * until spu_activate().
44 if (spu_init_csa(&ctx
->csa
))
46 spin_lock_init(&ctx
->mmio_lock
);
47 mutex_init(&ctx
->mapping_lock
);
48 kref_init(&ctx
->kref
);
49 mutex_init(&ctx
->state_mutex
);
50 mutex_init(&ctx
->run_mutex
);
51 init_waitqueue_head(&ctx
->ibox_wq
);
52 init_waitqueue_head(&ctx
->wbox_wq
);
53 init_waitqueue_head(&ctx
->stop_wq
);
54 init_waitqueue_head(&ctx
->mfc_wq
);
55 ctx
->state
= SPU_STATE_SAVED
;
56 ctx
->ops
= &spu_backing_ops
;
57 ctx
->owner
= get_task_mm(current
);
58 INIT_LIST_HEAD(&ctx
->rq
);
59 INIT_LIST_HEAD(&ctx
->aff_list
);
61 spu_gang_add_ctx(gang
, ctx
);
62 ctx
->cpus_allowed
= current
->cpus_allowed
;
63 spu_set_timeslice(ctx
);
64 ctx
->stats
.util_state
= SPU_UTIL_IDLE_LOADED
;
66 atomic_inc(&nr_spu_contexts
);
75 void destroy_spu_context(struct kref
*kref
)
77 struct spu_context
*ctx
;
78 ctx
= container_of(kref
, struct spu_context
, kref
);
79 mutex_lock(&ctx
->state_mutex
);
81 mutex_unlock(&ctx
->state_mutex
);
82 spu_fini_csa(&ctx
->csa
);
84 spu_gang_remove_ctx(ctx
->gang
, ctx
);
85 if (ctx
->prof_priv_kref
)
86 kref_put(ctx
->prof_priv_kref
, ctx
->prof_priv_release
);
87 BUG_ON(!list_empty(&ctx
->rq
));
88 atomic_dec(&nr_spu_contexts
);
92 struct spu_context
* get_spu_context(struct spu_context
*ctx
)
98 int put_spu_context(struct spu_context
*ctx
)
100 return kref_put(&ctx
->kref
, &destroy_spu_context
);
103 /* give up the mm reference when the context is about to be destroyed */
104 void spu_forget(struct spu_context
*ctx
)
106 struct mm_struct
*mm
;
107 spu_acquire_saved(ctx
);
114 void spu_unmap_mappings(struct spu_context
*ctx
)
116 mutex_lock(&ctx
->mapping_lock
);
117 if (ctx
->local_store
)
118 unmap_mapping_range(ctx
->local_store
, 0, LS_SIZE
, 1);
120 unmap_mapping_range(ctx
->mfc
, 0, 0x1000, 1);
122 unmap_mapping_range(ctx
->cntl
, 0, 0x1000, 1);
124 unmap_mapping_range(ctx
->signal1
, 0, PAGE_SIZE
, 1);
126 unmap_mapping_range(ctx
->signal2
, 0, PAGE_SIZE
, 1);
128 unmap_mapping_range(ctx
->mss
, 0, 0x1000, 1);
130 unmap_mapping_range(ctx
->psmap
, 0, 0x20000, 1);
131 mutex_unlock(&ctx
->mapping_lock
);
135 * spu_acquire_runnable - lock spu contex and make sure it is in runnable state
136 * @ctx: spu contex to lock
139 * Returns 0 and with the context locked on success
140 * Returns negative error and with the context _unlocked_ on failure.
142 int spu_acquire_runnable(struct spu_context
*ctx
, unsigned long flags
)
147 if (ctx
->state
== SPU_STATE_SAVED
) {
149 * Context is about to be freed, so we can't acquire it anymore.
153 ret
= spu_activate(ctx
, flags
);
166 * spu_acquire_saved - lock spu contex and make sure it is in saved state
167 * @ctx: spu contex to lock
169 void spu_acquire_saved(struct spu_context
*ctx
)
172 if (ctx
->state
!= SPU_STATE_SAVED
) {
173 set_bit(SPU_SCHED_WAS_ACTIVE
, &ctx
->sched_flags
);
179 * spu_release_saved - unlock spu context and return it to the runqueue
180 * @ctx: context to unlock
182 void spu_release_saved(struct spu_context
*ctx
)
184 BUG_ON(ctx
->state
!= SPU_STATE_SAVED
);
186 if (test_and_clear_bit(SPU_SCHED_WAS_ACTIVE
, &ctx
->sched_flags
))
187 spu_activate(ctx
, 0);
192 void spu_set_profile_private_kref(struct spu_context
*ctx
,
193 struct kref
*prof_info_kref
,
194 void ( * prof_info_release
) (struct kref
*kref
))
196 ctx
->prof_priv_kref
= prof_info_kref
;
197 ctx
->prof_priv_release
= prof_info_release
;
199 EXPORT_SYMBOL_GPL(spu_set_profile_private_kref
);
201 void *spu_get_profile_private_kref(struct spu_context
*ctx
)
203 return ctx
->prof_priv_kref
;
205 EXPORT_SYMBOL_GPL(spu_get_profile_private_kref
);