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/sched.h>
26 #include <linux/slab.h>
27 #include <linux/atomic.h>
29 #include <asm/spu_csa.h>
34 atomic_t nr_spu_contexts
= ATOMIC_INIT(0);
36 struct spu_context
*alloc_spu_context(struct spu_gang
*gang
)
38 struct spu_context
*ctx
;
41 ctx
= kzalloc(sizeof *ctx
, GFP_KERNEL
);
44 /* Binding to physical processor deferred
45 * until spu_activate().
47 if (spu_init_csa(&ctx
->csa
))
49 spin_lock_init(&ctx
->mmio_lock
);
50 mutex_init(&ctx
->mapping_lock
);
51 kref_init(&ctx
->kref
);
52 mutex_init(&ctx
->state_mutex
);
53 mutex_init(&ctx
->run_mutex
);
54 init_waitqueue_head(&ctx
->ibox_wq
);
55 init_waitqueue_head(&ctx
->wbox_wq
);
56 init_waitqueue_head(&ctx
->stop_wq
);
57 init_waitqueue_head(&ctx
->mfc_wq
);
58 init_waitqueue_head(&ctx
->run_wq
);
59 ctx
->state
= SPU_STATE_SAVED
;
60 ctx
->ops
= &spu_backing_ops
;
61 ctx
->owner
= get_task_mm(current
);
62 INIT_LIST_HEAD(&ctx
->rq
);
63 INIT_LIST_HEAD(&ctx
->aff_list
);
65 spu_gang_add_ctx(gang
, ctx
);
67 __spu_update_sched_info(ctx
);
68 spu_set_timeslice(ctx
);
69 ctx
->stats
.util_state
= SPU_UTIL_IDLE_LOADED
;
71 ctx
->stats
.tstamp
= timespec_to_ns(&ts
);
73 atomic_inc(&nr_spu_contexts
);
82 void destroy_spu_context(struct kref
*kref
)
84 struct spu_context
*ctx
;
85 ctx
= container_of(kref
, struct spu_context
, kref
);
86 spu_context_nospu_trace(destroy_spu_context__enter
, ctx
);
87 mutex_lock(&ctx
->state_mutex
);
89 mutex_unlock(&ctx
->state_mutex
);
90 spu_fini_csa(&ctx
->csa
);
92 spu_gang_remove_ctx(ctx
->gang
, ctx
);
93 if (ctx
->prof_priv_kref
)
94 kref_put(ctx
->prof_priv_kref
, ctx
->prof_priv_release
);
95 BUG_ON(!list_empty(&ctx
->rq
));
96 atomic_dec(&nr_spu_contexts
);
97 kfree(ctx
->switch_log
);
101 struct spu_context
* get_spu_context(struct spu_context
*ctx
)
103 kref_get(&ctx
->kref
);
107 int put_spu_context(struct spu_context
*ctx
)
109 return kref_put(&ctx
->kref
, &destroy_spu_context
);
112 /* give up the mm reference when the context is about to be destroyed */
113 void spu_forget(struct spu_context
*ctx
)
115 struct mm_struct
*mm
;
118 * This is basically an open-coded spu_acquire_saved, except that
119 * we don't acquire the state mutex interruptible, and we don't
120 * want this context to be rescheduled on release.
122 mutex_lock(&ctx
->state_mutex
);
123 if (ctx
->state
!= SPU_STATE_SAVED
)
132 void spu_unmap_mappings(struct spu_context
*ctx
)
134 mutex_lock(&ctx
->mapping_lock
);
135 if (ctx
->local_store
)
136 unmap_mapping_range(ctx
->local_store
, 0, LS_SIZE
, 1);
138 unmap_mapping_range(ctx
->mfc
, 0, SPUFS_MFC_MAP_SIZE
, 1);
140 unmap_mapping_range(ctx
->cntl
, 0, SPUFS_CNTL_MAP_SIZE
, 1);
142 unmap_mapping_range(ctx
->signal1
, 0, SPUFS_SIGNAL_MAP_SIZE
, 1);
144 unmap_mapping_range(ctx
->signal2
, 0, SPUFS_SIGNAL_MAP_SIZE
, 1);
146 unmap_mapping_range(ctx
->mss
, 0, SPUFS_MSS_MAP_SIZE
, 1);
148 unmap_mapping_range(ctx
->psmap
, 0, SPUFS_PS_MAP_SIZE
, 1);
149 mutex_unlock(&ctx
->mapping_lock
);
153 * spu_acquire_saved - lock spu contex and make sure it is in saved state
154 * @ctx: spu contex to lock
156 int spu_acquire_saved(struct spu_context
*ctx
)
160 spu_context_nospu_trace(spu_acquire_saved__enter
, ctx
);
162 ret
= spu_acquire(ctx
);
166 if (ctx
->state
!= SPU_STATE_SAVED
) {
167 set_bit(SPU_SCHED_WAS_ACTIVE
, &ctx
->sched_flags
);
175 * spu_release_saved - unlock spu context and return it to the runqueue
176 * @ctx: context to unlock
178 void spu_release_saved(struct spu_context
*ctx
)
180 BUG_ON(ctx
->state
!= SPU_STATE_SAVED
);
182 if (test_and_clear_bit(SPU_SCHED_WAS_ACTIVE
, &ctx
->sched_flags
) &&
183 test_bit(SPU_SCHED_SPU_RUN
, &ctx
->sched_flags
))
184 spu_activate(ctx
, 0);