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Linux/arch/powerpc/platforms/cell/spufs/context.c

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  1 /*
  2  * SPU file system -- SPU context management
  3  *
  4  * (C) Copyright IBM Deutschland Entwicklung GmbH 2005
  5  *
  6  * Author: Arnd Bergmann <arndb@de.ibm.com>
  7  *
  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)
 11  * any later version.
 12  *
 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.
 17  *
 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.
 21  */
 22 
 23 #include <linux/fs.h>
 24 #include <linux/mm.h>
 25 #include <linux/slab.h>
 26 #include <linux/atomic.h>
 27 #include <linux/sched.h>
 28 #include <asm/spu.h>
 29 #include <asm/spu_csa.h>
 30 #include "spufs.h"
 31 #include "sputrace.h"
 32 
 33 
 34 atomic_t nr_spu_contexts = ATOMIC_INIT(0);
 35 
 36 struct spu_context *alloc_spu_context(struct spu_gang *gang)
 37 {
 38         struct spu_context *ctx;
 39 
 40         ctx = kzalloc(sizeof *ctx, GFP_KERNEL);
 41         if (!ctx)
 42                 goto out;
 43         /* Binding to physical processor deferred
 44          * until spu_activate().
 45          */
 46         if (spu_init_csa(&ctx->csa))
 47                 goto out_free;
 48         spin_lock_init(&ctx->mmio_lock);
 49         mutex_init(&ctx->mapping_lock);
 50         kref_init(&ctx->kref);
 51         mutex_init(&ctx->state_mutex);
 52         mutex_init(&ctx->run_mutex);
 53         init_waitqueue_head(&ctx->ibox_wq);
 54         init_waitqueue_head(&ctx->wbox_wq);
 55         init_waitqueue_head(&ctx->stop_wq);
 56         init_waitqueue_head(&ctx->mfc_wq);
 57         init_waitqueue_head(&ctx->run_wq);
 58         ctx->state = SPU_STATE_SAVED;
 59         ctx->ops = &spu_backing_ops;
 60         ctx->owner = get_task_mm(current);
 61         INIT_LIST_HEAD(&ctx->rq);
 62         INIT_LIST_HEAD(&ctx->aff_list);
 63         if (gang)
 64                 spu_gang_add_ctx(gang, ctx);
 65 
 66         __spu_update_sched_info(ctx);
 67         spu_set_timeslice(ctx);
 68         ctx->stats.util_state = SPU_UTIL_IDLE_LOADED;
 69         ctx->stats.tstamp = ktime_get_ns();
 70 
 71         atomic_inc(&nr_spu_contexts);
 72         goto out;
 73 out_free:
 74         kfree(ctx);
 75         ctx = NULL;
 76 out:
 77         return ctx;
 78 }
 79 
 80 void destroy_spu_context(struct kref *kref)
 81 {
 82         struct spu_context *ctx;
 83         ctx = container_of(kref, struct spu_context, kref);
 84         spu_context_nospu_trace(destroy_spu_context__enter, ctx);
 85         mutex_lock(&ctx->state_mutex);
 86         spu_deactivate(ctx);
 87         mutex_unlock(&ctx->state_mutex);
 88         spu_fini_csa(&ctx->csa);
 89         if (ctx->gang)
 90                 spu_gang_remove_ctx(ctx->gang, ctx);
 91         if (ctx->prof_priv_kref)
 92                 kref_put(ctx->prof_priv_kref, ctx->prof_priv_release);
 93         BUG_ON(!list_empty(&ctx->rq));
 94         atomic_dec(&nr_spu_contexts);
 95         kfree(ctx->switch_log);
 96         kfree(ctx);
 97 }
 98 
 99 struct spu_context * get_spu_context(struct spu_context *ctx)
100 {
101         kref_get(&ctx->kref);
102         return ctx;
103 }
104 
105 int put_spu_context(struct spu_context *ctx)
106 {
107         return kref_put(&ctx->kref, &destroy_spu_context);
108 }
109 
110 /* give up the mm reference when the context is about to be destroyed */
111 void spu_forget(struct spu_context *ctx)
112 {
113         struct mm_struct *mm;
114 
115         /*
116          * This is basically an open-coded spu_acquire_saved, except that
117          * we don't acquire the state mutex interruptible, and we don't
118          * want this context to be rescheduled on release.
119          */
120         mutex_lock(&ctx->state_mutex);
121         if (ctx->state != SPU_STATE_SAVED)
122                 spu_deactivate(ctx);
123 
124         mm = ctx->owner;
125         ctx->owner = NULL;
126         mmput(mm);
127         spu_release(ctx);
128 }
129 
130 void spu_unmap_mappings(struct spu_context *ctx)
131 {
132         mutex_lock(&ctx->mapping_lock);
133         if (ctx->local_store)
134                 unmap_mapping_range(ctx->local_store, 0, LS_SIZE, 1);
135         if (ctx->mfc)
136                 unmap_mapping_range(ctx->mfc, 0, SPUFS_MFC_MAP_SIZE, 1);
137         if (ctx->cntl)
138                 unmap_mapping_range(ctx->cntl, 0, SPUFS_CNTL_MAP_SIZE, 1);
139         if (ctx->signal1)
140                 unmap_mapping_range(ctx->signal1, 0, SPUFS_SIGNAL_MAP_SIZE, 1);
141         if (ctx->signal2)
142                 unmap_mapping_range(ctx->signal2, 0, SPUFS_SIGNAL_MAP_SIZE, 1);
143         if (ctx->mss)
144                 unmap_mapping_range(ctx->mss, 0, SPUFS_MSS_MAP_SIZE, 1);
145         if (ctx->psmap)
146                 unmap_mapping_range(ctx->psmap, 0, SPUFS_PS_MAP_SIZE, 1);
147         mutex_unlock(&ctx->mapping_lock);
148 }
149 
150 /**
151  * spu_acquire_saved - lock spu contex and make sure it is in saved state
152  * @ctx:        spu contex to lock
153  */
154 int spu_acquire_saved(struct spu_context *ctx)
155 {
156         int ret;
157 
158         spu_context_nospu_trace(spu_acquire_saved__enter, ctx);
159 
160         ret = spu_acquire(ctx);
161         if (ret)
162                 return ret;
163 
164         if (ctx->state != SPU_STATE_SAVED) {
165                 set_bit(SPU_SCHED_WAS_ACTIVE, &ctx->sched_flags);
166                 spu_deactivate(ctx);
167         }
168 
169         return 0;
170 }
171 
172 /**
173  * spu_release_saved - unlock spu context and return it to the runqueue
174  * @ctx:        context to unlock
175  */
176 void spu_release_saved(struct spu_context *ctx)
177 {
178         BUG_ON(ctx->state != SPU_STATE_SAVED);
179 
180         if (test_and_clear_bit(SPU_SCHED_WAS_ACTIVE, &ctx->sched_flags) &&
181                         test_bit(SPU_SCHED_SPU_RUN, &ctx->sched_flags))
182                 spu_activate(ctx, 0);
183 
184         spu_release(ctx);
185 }
186 
187 

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