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

http://github.com/mirrors/linux
C | 175 lines | 126 code | 24 blank | 25 comment | 19 complexity | 813a2a5f0c51f7972093d88eb58a8147 MD5 | raw file
  1// SPDX-License-Identifier: GPL-2.0-or-later
  2/*
  3 * SPU file system -- SPU context management
  4 *
  5 * (C) Copyright IBM Deutschland Entwicklung GmbH 2005
  6 *
  7 * Author: Arnd Bergmann <arndb@de.ibm.com>
  8 */
  9
 10#include <linux/fs.h>
 11#include <linux/mm.h>
 12#include <linux/slab.h>
 13#include <linux/atomic.h>
 14#include <linux/sched.h>
 15#include <linux/sched/mm.h>
 16
 17#include <asm/spu.h>
 18#include <asm/spu_csa.h>
 19#include "spufs.h"
 20#include "sputrace.h"
 21
 22
 23atomic_t nr_spu_contexts = ATOMIC_INIT(0);
 24
 25struct spu_context *alloc_spu_context(struct spu_gang *gang)
 26{
 27	struct spu_context *ctx;
 28
 29	ctx = kzalloc(sizeof *ctx, GFP_KERNEL);
 30	if (!ctx)
 31		goto out;
 32	/* Binding to physical processor deferred
 33	 * until spu_activate().
 34	 */
 35	if (spu_init_csa(&ctx->csa))
 36		goto out_free;
 37	spin_lock_init(&ctx->mmio_lock);
 38	mutex_init(&ctx->mapping_lock);
 39	kref_init(&ctx->kref);
 40	mutex_init(&ctx->state_mutex);
 41	mutex_init(&ctx->run_mutex);
 42	init_waitqueue_head(&ctx->ibox_wq);
 43	init_waitqueue_head(&ctx->wbox_wq);
 44	init_waitqueue_head(&ctx->stop_wq);
 45	init_waitqueue_head(&ctx->mfc_wq);
 46	init_waitqueue_head(&ctx->run_wq);
 47	ctx->state = SPU_STATE_SAVED;
 48	ctx->ops = &spu_backing_ops;
 49	ctx->owner = get_task_mm(current);
 50	INIT_LIST_HEAD(&ctx->rq);
 51	INIT_LIST_HEAD(&ctx->aff_list);
 52	if (gang)
 53		spu_gang_add_ctx(gang, ctx);
 54
 55	__spu_update_sched_info(ctx);
 56	spu_set_timeslice(ctx);
 57	ctx->stats.util_state = SPU_UTIL_IDLE_LOADED;
 58	ctx->stats.tstamp = ktime_get_ns();
 59
 60	atomic_inc(&nr_spu_contexts);
 61	goto out;
 62out_free:
 63	kfree(ctx);
 64	ctx = NULL;
 65out:
 66	return ctx;
 67}
 68
 69void destroy_spu_context(struct kref *kref)
 70{
 71	struct spu_context *ctx;
 72	ctx = container_of(kref, struct spu_context, kref);
 73	spu_context_nospu_trace(destroy_spu_context__enter, ctx);
 74	mutex_lock(&ctx->state_mutex);
 75	spu_deactivate(ctx);
 76	mutex_unlock(&ctx->state_mutex);
 77	spu_fini_csa(&ctx->csa);
 78	if (ctx->gang)
 79		spu_gang_remove_ctx(ctx->gang, ctx);
 80	if (ctx->prof_priv_kref)
 81		kref_put(ctx->prof_priv_kref, ctx->prof_priv_release);
 82	BUG_ON(!list_empty(&ctx->rq));
 83	atomic_dec(&nr_spu_contexts);
 84	kfree(ctx->switch_log);
 85	kfree(ctx);
 86}
 87
 88struct spu_context * get_spu_context(struct spu_context *ctx)
 89{
 90	kref_get(&ctx->kref);
 91	return ctx;
 92}
 93
 94int put_spu_context(struct spu_context *ctx)
 95{
 96	return kref_put(&ctx->kref, &destroy_spu_context);
 97}
 98
 99/* give up the mm reference when the context is about to be destroyed */
100void spu_forget(struct spu_context *ctx)
101{
102	struct mm_struct *mm;
103
104	/*
105	 * This is basically an open-coded spu_acquire_saved, except that
106	 * we don't acquire the state mutex interruptible, and we don't
107	 * want this context to be rescheduled on release.
108	 */
109	mutex_lock(&ctx->state_mutex);
110	if (ctx->state != SPU_STATE_SAVED)
111		spu_deactivate(ctx);
112
113	mm = ctx->owner;
114	ctx->owner = NULL;
115	mmput(mm);
116	spu_release(ctx);
117}
118
119void spu_unmap_mappings(struct spu_context *ctx)
120{
121	mutex_lock(&ctx->mapping_lock);
122	if (ctx->local_store)
123		unmap_mapping_range(ctx->local_store, 0, LS_SIZE, 1);
124	if (ctx->mfc)
125		unmap_mapping_range(ctx->mfc, 0, SPUFS_MFC_MAP_SIZE, 1);
126	if (ctx->cntl)
127		unmap_mapping_range(ctx->cntl, 0, SPUFS_CNTL_MAP_SIZE, 1);
128	if (ctx->signal1)
129		unmap_mapping_range(ctx->signal1, 0, SPUFS_SIGNAL_MAP_SIZE, 1);
130	if (ctx->signal2)
131		unmap_mapping_range(ctx->signal2, 0, SPUFS_SIGNAL_MAP_SIZE, 1);
132	if (ctx->mss)
133		unmap_mapping_range(ctx->mss, 0, SPUFS_MSS_MAP_SIZE, 1);
134	if (ctx->psmap)
135		unmap_mapping_range(ctx->psmap, 0, SPUFS_PS_MAP_SIZE, 1);
136	mutex_unlock(&ctx->mapping_lock);
137}
138
139/**
140 * spu_acquire_saved - lock spu contex and make sure it is in saved state
141 * @ctx:	spu contex to lock
142 */
143int spu_acquire_saved(struct spu_context *ctx)
144{
145	int ret;
146
147	spu_context_nospu_trace(spu_acquire_saved__enter, ctx);
148
149	ret = spu_acquire(ctx);
150	if (ret)
151		return ret;
152
153	if (ctx->state != SPU_STATE_SAVED) {
154		set_bit(SPU_SCHED_WAS_ACTIVE, &ctx->sched_flags);
155		spu_deactivate(ctx);
156	}
157
158	return 0;
159}
160
161/**
162 * spu_release_saved - unlock spu context and return it to the runqueue
163 * @ctx:	context to unlock
164 */
165void spu_release_saved(struct spu_context *ctx)
166{
167	BUG_ON(ctx->state != SPU_STATE_SAVED);
168
169	if (test_and_clear_bit(SPU_SCHED_WAS_ACTIVE, &ctx->sched_flags) &&
170			test_bit(SPU_SCHED_SPU_RUN, &ctx->sched_flags))
171		spu_activate(ctx, 0);
172
173	spu_release(ctx);
174}
175