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>
27 #include <asm/spu_csa.h>
30 struct spu_context
*alloc_spu_context(struct spu_gang
*gang
)
32 struct spu_context
*ctx
;
33 ctx
= kzalloc(sizeof *ctx
, GFP_KERNEL
);
36 /* Binding to physical processor deferred
37 * until spu_activate().
39 spu_init_csa(&ctx
->csa
);
40 if (!ctx
->csa
.lscsa
) {
43 spin_lock_init(&ctx
->mmio_lock
);
44 kref_init(&ctx
->kref
);
45 mutex_init(&ctx
->state_mutex
);
46 init_MUTEX(&ctx
->run_sema
);
47 init_waitqueue_head(&ctx
->ibox_wq
);
48 init_waitqueue_head(&ctx
->wbox_wq
);
49 init_waitqueue_head(&ctx
->stop_wq
);
50 init_waitqueue_head(&ctx
->mfc_wq
);
51 ctx
->state
= SPU_STATE_SAVED
;
52 ctx
->ops
= &spu_backing_ops
;
53 ctx
->owner
= get_task_mm(current
);
55 spu_gang_add_ctx(gang
, ctx
);
64 void destroy_spu_context(struct kref
*kref
)
66 struct spu_context
*ctx
;
67 ctx
= container_of(kref
, struct spu_context
, kref
);
68 mutex_lock(&ctx
->state_mutex
);
70 mutex_unlock(&ctx
->state_mutex
);
71 spu_fini_csa(&ctx
->csa
);
73 spu_gang_remove_ctx(ctx
->gang
, ctx
);
77 struct spu_context
* get_spu_context(struct spu_context
*ctx
)
83 int put_spu_context(struct spu_context
*ctx
)
85 return kref_put(&ctx
->kref
, &destroy_spu_context
);
88 /* give up the mm reference when the context is about to be destroyed */
89 void spu_forget(struct spu_context
*ctx
)
92 spu_acquire_saved(ctx
);
99 void spu_acquire(struct spu_context
*ctx
)
101 mutex_lock(&ctx
->state_mutex
);
104 void spu_release(struct spu_context
*ctx
)
106 mutex_unlock(&ctx
->state_mutex
);
109 void spu_unmap_mappings(struct spu_context
*ctx
)
111 if (ctx
->local_store
)
112 unmap_mapping_range(ctx
->local_store
, 0, LS_SIZE
, 1);
114 unmap_mapping_range(ctx
->mfc
, 0, 0x1000, 1);
116 unmap_mapping_range(ctx
->cntl
, 0, 0x1000, 1);
118 unmap_mapping_range(ctx
->signal1
, 0, PAGE_SIZE
, 1);
120 unmap_mapping_range(ctx
->signal2
, 0, PAGE_SIZE
, 1);
122 unmap_mapping_range(ctx
->mss
, 0, 0x1000, 1);
124 unmap_mapping_range(ctx
->psmap
, 0, 0x20000, 1);
127 int spu_acquire_exclusive(struct spu_context
*ctx
)
131 mutex_lock(&ctx
->state_mutex
);
132 /* ctx is about to be freed, can't acquire any more */
138 if (ctx
->state
== SPU_STATE_SAVED
) {
139 ret
= spu_activate(ctx
, 0);
143 /* We need to exclude userspace access to the context. */
144 spu_unmap_mappings(ctx
);
149 mutex_unlock(&ctx
->state_mutex
);
153 int spu_acquire_runnable(struct spu_context
*ctx
)
157 mutex_lock(&ctx
->state_mutex
);
158 if (ctx
->state
== SPU_STATE_RUNNABLE
) {
159 ctx
->spu
->prio
= current
->prio
;
163 /* ctx is about to be freed, can't acquire any more */
169 if (ctx
->state
== SPU_STATE_SAVED
) {
170 ret
= spu_activate(ctx
, 0);
175 /* On success, we return holding the lock */
178 /* Release here, to simplify calling code. */
179 mutex_unlock(&ctx
->state_mutex
);
184 void spu_acquire_saved(struct spu_context
*ctx
)
186 mutex_lock(&ctx
->state_mutex
);
187 if (ctx
->state
== SPU_STATE_RUNNABLE
)