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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 <linux/sched/mm.h>
 29 
 30 #include <asm/spu.h>
 31 #include <asm/spu_csa.h>
 32 #include "spufs.h"
 33 #include "sputrace.h"
 34 
 35 
 36 atomic_t nr_spu_contexts = ATOMIC_INIT(0);
 37 
 38 struct spu_context *alloc_spu_context(struct spu_gang *gang)
 39 {
 40         struct spu_context *ctx;
 41 
 42         ctx = kzalloc(sizeof *ctx, GFP_KERNEL);
 43         if (!ctx)
 44                 goto out;
 45         /* Binding to physical processor deferred
 46          * until spu_activate().
 47          */
 48         if (spu_init_csa(&ctx->csa))
 49                 goto out_free;
 50         spin_lock_init(&ctx->mmio_lock);
 51         mutex_init(&ctx->mapping_lock);
 52         kref_init(&ctx->kref);
 53         mutex_init(&ctx->state_mutex);
 54         mutex_init(&ctx->run_mutex);
 55         init_waitqueue_head(&ctx->ibox_wq);
 56         init_waitqueue_head(&ctx->wbox_wq);
 57         init_waitqueue_head(&ctx->stop_wq);
 58         init_waitqueue_head(&ctx->mfc_wq);
 59         init_waitqueue_head(&ctx->run_wq);
 60         ctx->state = SPU_STATE_SAVED;
 61         ctx->ops = &spu_backing_ops;
 62         ctx->owner = get_task_mm(current);
 63         INIT_LIST_HEAD(&ctx->rq);
 64         INIT_LIST_HEAD(&ctx->aff_list);
 65         if (gang)
 66                 spu_gang_add_ctx(gang, ctx);
 67 
 68         __spu_update_sched_info(ctx);
 69         spu_set_timeslice(ctx);
 70         ctx->stats.util_state = SPU_UTIL_IDLE_LOADED;
 71         ctx->stats.tstamp = ktime_get_ns();
 72 
 73         atomic_inc(&nr_spu_contexts);
 74         goto out;
 75 out_free:
 76         kfree(ctx);
 77         ctx = NULL;
 78 out:
 79         return ctx;
 80 }
 81 
 82 void destroy_spu_context(struct kref *kref)
 83 {
 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);
 88         spu_deactivate(ctx);
 89         mutex_unlock(&ctx->state_mutex);
 90         spu_fini_csa(&ctx->csa);
 91         if (ctx->gang)
 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);
 98         kfree(ctx);
 99 }
100 
101 struct spu_context * get_spu_context(struct spu_context *ctx)
102 {
103         kref_get(&ctx->kref);
104         return ctx;
105 }
106 
107 int put_spu_context(struct spu_context *ctx)
108 {
109         return kref_put(&ctx->kref, &destroy_spu_context);
110 }
111 
112 /* give up the mm reference when the context is about to be destroyed */
113 void spu_forget(struct spu_context *ctx)
114 {
115         struct mm_struct *mm;
116 
117         /*
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.
121          */
122         mutex_lock(&ctx->state_mutex);
123         if (ctx->state != SPU_STATE_SAVED)
124                 spu_deactivate(ctx);
125 
126         mm = ctx->owner;
127         ctx->owner = NULL;
128         mmput(mm);
129         spu_release(ctx);
130 }
131 
132 void spu_unmap_mappings(struct spu_context *ctx)
133 {
134         mutex_lock(&ctx->mapping_lock);
135         if (ctx->local_store)
136                 unmap_mapping_range(ctx->local_store, 0, LS_SIZE, 1);
137         if (ctx->mfc)
138                 unmap_mapping_range(ctx->mfc, 0, SPUFS_MFC_MAP_SIZE, 1);
139         if (ctx->cntl)
140                 unmap_mapping_range(ctx->cntl, 0, SPUFS_CNTL_MAP_SIZE, 1);
141         if (ctx->signal1)
142                 unmap_mapping_range(ctx->signal1, 0, SPUFS_SIGNAL_MAP_SIZE, 1);
143         if (ctx->signal2)
144                 unmap_mapping_range(ctx->signal2, 0, SPUFS_SIGNAL_MAP_SIZE, 1);
145         if (ctx->mss)
146                 unmap_mapping_range(ctx->mss, 0, SPUFS_MSS_MAP_SIZE, 1);
147         if (ctx->psmap)
148                 unmap_mapping_range(ctx->psmap, 0, SPUFS_PS_MAP_SIZE, 1);
149         mutex_unlock(&ctx->mapping_lock);
150 }
151 
152 /**
153  * spu_acquire_saved - lock spu contex and make sure it is in saved state
154  * @ctx:        spu contex to lock
155  */
156 int spu_acquire_saved(struct spu_context *ctx)
157 {
158         int ret;
159 
160         spu_context_nospu_trace(spu_acquire_saved__enter, ctx);
161 
162         ret = spu_acquire(ctx);
163         if (ret)
164                 return ret;
165 
166         if (ctx->state != SPU_STATE_SAVED) {
167                 set_bit(SPU_SCHED_WAS_ACTIVE, &ctx->sched_flags);
168                 spu_deactivate(ctx);
169         }
170 
171         return 0;
172 }
173 
174 /**
175  * spu_release_saved - unlock spu context and return it to the runqueue
176  * @ctx:        context to unlock
177  */
178 void spu_release_saved(struct spu_context *ctx)
179 {
180         BUG_ON(ctx->state != SPU_STATE_SAVED);
181 
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);
185 
186         spu_release(ctx);
187 }
188 
189 

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