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_unmap_mappings(struct spu_context *ctx)
101 if (ctx->local_store)
102 unmap_mapping_range(ctx->local_store, 0, LS_SIZE, 1);
104 unmap_mapping_range(ctx->mfc, 0, 0x1000, 1);
106 unmap_mapping_range(ctx->cntl, 0, 0x1000, 1);
108 unmap_mapping_range(ctx->signal1, 0, PAGE_SIZE, 1);
110 unmap_mapping_range(ctx->signal2, 0, PAGE_SIZE, 1);
112 unmap_mapping_range(ctx->mss, 0, 0x1000, 1);
114 unmap_mapping_range(ctx->psmap, 0, 0x20000, 1);
118 * spu_acquire_exclusive - lock spu contex and protect against userspace access
119 * @ctx: spu contex to lock
122 * Returns 0 and with the context locked on success
123 * Returns negative error and with the context _unlocked_ on failure.
125 int spu_acquire_exclusive(struct spu_context *ctx)
131 * Context is about to be freed, so we can't acquire it anymore.
136 if (ctx->state == SPU_STATE_SAVED) {
137 ret = spu_activate(ctx, 0);
142 * We need to exclude userspace access to the context.
144 * To protect against memory access we invalidate all ptes
145 * and make sure the pagefault handlers block on the mutex.
147 spu_unmap_mappings(ctx);
158 * spu_acquire_runnable - lock spu contex and make sure it is in runnable state
159 * @ctx: spu contex to lock
162 * Returns 0 and with the context locked on success
163 * Returns negative error and with the context _unlocked_ on failure.
165 int spu_acquire_runnable(struct spu_context *ctx)
170 if (ctx->state == SPU_STATE_SAVED) {
172 * Context is about to be freed, so we can't acquire it anymore.
176 ret = spu_activate(ctx, 0);
180 ctx->spu->prio = current->prio;
190 * spu_acquire_saved - lock spu contex and make sure it is in saved state
191 * @ctx: spu contex to lock
193 void spu_acquire_saved(struct spu_context *ctx)
196 if (ctx->state != SPU_STATE_SAVED)