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 spin_lock_init(&ctx
->mapping_lock
);
45 kref_init(&ctx
->kref
);
46 mutex_init(&ctx
->state_mutex
);
47 init_MUTEX(&ctx
->run_sema
);
48 init_waitqueue_head(&ctx
->ibox_wq
);
49 init_waitqueue_head(&ctx
->wbox_wq
);
50 init_waitqueue_head(&ctx
->stop_wq
);
51 init_waitqueue_head(&ctx
->mfc_wq
);
52 ctx
->state
= SPU_STATE_SAVED
;
53 ctx
->ops
= &spu_backing_ops
;
54 ctx
->owner
= get_task_mm(current
);
55 INIT_LIST_HEAD(&ctx
->rq
);
57 spu_gang_add_ctx(gang
, ctx
);
58 ctx
->rt_priority
= current
->rt_priority
;
59 ctx
->policy
= current
->policy
;
60 ctx
->prio
= current
->prio
;
61 INIT_DELAYED_WORK(&ctx
->sched_work
, spu_sched_tick
);
70 void destroy_spu_context(struct kref
*kref
)
72 struct spu_context
*ctx
;
73 ctx
= container_of(kref
, struct spu_context
, kref
);
74 mutex_lock(&ctx
->state_mutex
);
76 mutex_unlock(&ctx
->state_mutex
);
77 spu_fini_csa(&ctx
->csa
);
79 spu_gang_remove_ctx(ctx
->gang
, ctx
);
80 BUG_ON(!list_empty(&ctx
->rq
));
84 struct spu_context
* get_spu_context(struct spu_context
*ctx
)
90 int put_spu_context(struct spu_context
*ctx
)
92 return kref_put(&ctx
->kref
, &destroy_spu_context
);
95 /* give up the mm reference when the context is about to be destroyed */
96 void spu_forget(struct spu_context
*ctx
)
99 spu_acquire_saved(ctx
);
106 void spu_unmap_mappings(struct spu_context
*ctx
)
108 if (ctx
->local_store
)
109 unmap_mapping_range(ctx
->local_store
, 0, LS_SIZE
, 1);
111 unmap_mapping_range(ctx
->mfc
, 0, 0x1000, 1);
113 unmap_mapping_range(ctx
->cntl
, 0, 0x1000, 1);
115 unmap_mapping_range(ctx
->signal1
, 0, PAGE_SIZE
, 1);
117 unmap_mapping_range(ctx
->signal2
, 0, PAGE_SIZE
, 1);
119 unmap_mapping_range(ctx
->mss
, 0, 0x1000, 1);
121 unmap_mapping_range(ctx
->psmap
, 0, 0x20000, 1);
125 * spu_acquire_exclusive - lock spu contex and protect against userspace access
126 * @ctx: spu contex to lock
129 * Returns 0 and with the context locked on success
130 * Returns negative error and with the context _unlocked_ on failure.
132 int spu_acquire_exclusive(struct spu_context
*ctx
)
138 * Context is about to be freed, so we can't acquire it anymore.
143 if (ctx
->state
== SPU_STATE_SAVED
) {
144 ret
= spu_activate(ctx
, 0);
149 * We need to exclude userspace access to the context.
151 * To protect against memory access we invalidate all ptes
152 * and make sure the pagefault handlers block on the mutex.
154 spu_unmap_mappings(ctx
);
165 * spu_acquire_runnable - lock spu contex and make sure it is in runnable state
166 * @ctx: spu contex to lock
169 * Returns 0 and with the context locked on success
170 * Returns negative error and with the context _unlocked_ on failure.
172 int spu_acquire_runnable(struct spu_context
*ctx
, unsigned long flags
)
177 if (ctx
->state
== SPU_STATE_SAVED
) {
179 * Context is about to be freed, so we can't acquire it anymore.
183 ret
= spu_activate(ctx
, flags
);
196 * spu_acquire_saved - lock spu contex and make sure it is in saved state
197 * @ctx: spu contex to lock
199 void spu_acquire_saved(struct spu_context
*ctx
)
202 if (ctx
->state
!= SPU_STATE_SAVED
)