--- /dev/null
+/*
+ * SPU file system -- SPU context management
+ *
+ * (C) Copyright IBM Deutschland Entwicklung GmbH 2005
+ *
+ * Author: Arnd Bergmann <arndb@de.ibm.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <linux/fs.h>
+#include <linux/mm.h>
+#include <linux/slab.h>
+#include <linux/atomic.h>
+#include <linux/sched.h>
+#include <asm/spu.h>
+#include <asm/spu_csa.h>
+#include "spufs.h"
+#include "sputrace.h"
+
+
+atomic_t nr_spu_contexts = ATOMIC_INIT(0);
+
+struct spu_context *alloc_spu_context(struct spu_gang *gang)
+{
+ struct spu_context *ctx;
+
+ ctx = kzalloc(sizeof *ctx, GFP_KERNEL);
+ if (!ctx)
+ goto out;
+ /* Binding to physical processor deferred
+ * until spu_activate().
+ */
+ if (spu_init_csa(&ctx->csa))
+ goto out_free;
+ spin_lock_init(&ctx->mmio_lock);
+ mutex_init(&ctx->mapping_lock);
+ kref_init(&ctx->kref);
+ mutex_init(&ctx->state_mutex);
+ mutex_init(&ctx->run_mutex);
+ init_waitqueue_head(&ctx->ibox_wq);
+ init_waitqueue_head(&ctx->wbox_wq);
+ init_waitqueue_head(&ctx->stop_wq);
+ init_waitqueue_head(&ctx->mfc_wq);
+ init_waitqueue_head(&ctx->run_wq);
+ ctx->state = SPU_STATE_SAVED;
+ ctx->ops = &spu_backing_ops;
+ ctx->owner = get_task_mm(current);
+ INIT_LIST_HEAD(&ctx->rq);
+ INIT_LIST_HEAD(&ctx->aff_list);
+ if (gang)
+ spu_gang_add_ctx(gang, ctx);
+
+ __spu_update_sched_info(ctx);
+ spu_set_timeslice(ctx);
+ ctx->stats.util_state = SPU_UTIL_IDLE_LOADED;
+ ctx->stats.tstamp = ktime_get_ns();
+
+ atomic_inc(&nr_spu_contexts);
+ goto out;
+out_free:
+ kfree(ctx);
+ ctx = NULL;
+out:
+ return ctx;
+}
+
+void destroy_spu_context(struct kref *kref)
+{
+ struct spu_context *ctx;
+ ctx = container_of(kref, struct spu_context, kref);
+ spu_context_nospu_trace(destroy_spu_context__enter, ctx);
+ mutex_lock(&ctx->state_mutex);
+ spu_deactivate(ctx);
+ mutex_unlock(&ctx->state_mutex);
+ spu_fini_csa(&ctx->csa);
+ if (ctx->gang)
+ spu_gang_remove_ctx(ctx->gang, ctx);
+ if (ctx->prof_priv_kref)
+ kref_put(ctx->prof_priv_kref, ctx->prof_priv_release);
+ BUG_ON(!list_empty(&ctx->rq));
+ atomic_dec(&nr_spu_contexts);
+ kfree(ctx->switch_log);
+ kfree(ctx);
+}
+
+struct spu_context * get_spu_context(struct spu_context *ctx)
+{
+ kref_get(&ctx->kref);
+ return ctx;
+}
+
+int put_spu_context(struct spu_context *ctx)
+{
+ return kref_put(&ctx->kref, &destroy_spu_context);
+}
+
+/* give up the mm reference when the context is about to be destroyed */
+void spu_forget(struct spu_context *ctx)
+{
+ struct mm_struct *mm;
+
+ /*
+ * This is basically an open-coded spu_acquire_saved, except that
+ * we don't acquire the state mutex interruptible, and we don't
+ * want this context to be rescheduled on release.
+ */
+ mutex_lock(&ctx->state_mutex);
+ if (ctx->state != SPU_STATE_SAVED)
+ spu_deactivate(ctx);
+
+ mm = ctx->owner;
+ ctx->owner = NULL;
+ mmput(mm);
+ spu_release(ctx);
+}
+
+void spu_unmap_mappings(struct spu_context *ctx)
+{
+ mutex_lock(&ctx->mapping_lock);
+ if (ctx->local_store)
+ unmap_mapping_range(ctx->local_store, 0, LS_SIZE, 1);
+ if (ctx->mfc)
+ unmap_mapping_range(ctx->mfc, 0, SPUFS_MFC_MAP_SIZE, 1);
+ if (ctx->cntl)
+ unmap_mapping_range(ctx->cntl, 0, SPUFS_CNTL_MAP_SIZE, 1);
+ if (ctx->signal1)
+ unmap_mapping_range(ctx->signal1, 0, SPUFS_SIGNAL_MAP_SIZE, 1);
+ if (ctx->signal2)
+ unmap_mapping_range(ctx->signal2, 0, SPUFS_SIGNAL_MAP_SIZE, 1);
+ if (ctx->mss)
+ unmap_mapping_range(ctx->mss, 0, SPUFS_MSS_MAP_SIZE, 1);
+ if (ctx->psmap)
+ unmap_mapping_range(ctx->psmap, 0, SPUFS_PS_MAP_SIZE, 1);
+ mutex_unlock(&ctx->mapping_lock);
+}
+
+/**
+ * spu_acquire_saved - lock spu contex and make sure it is in saved state
+ * @ctx: spu contex to lock
+ */
+int spu_acquire_saved(struct spu_context *ctx)
+{
+ int ret;
+
+ spu_context_nospu_trace(spu_acquire_saved__enter, ctx);
+
+ ret = spu_acquire(ctx);
+ if (ret)
+ return ret;
+
+ if (ctx->state != SPU_STATE_SAVED) {
+ set_bit(SPU_SCHED_WAS_ACTIVE, &ctx->sched_flags);
+ spu_deactivate(ctx);
+ }
+
+ return 0;
+}
+
+/**
+ * spu_release_saved - unlock spu context and return it to the runqueue
+ * @ctx: context to unlock
+ */
+void spu_release_saved(struct spu_context *ctx)
+{
+ BUG_ON(ctx->state != SPU_STATE_SAVED);
+
+ if (test_and_clear_bit(SPU_SCHED_WAS_ACTIVE, &ctx->sched_flags) &&
+ test_bit(SPU_SCHED_SPU_RUN, &ctx->sched_flags))
+ spu_activate(ctx, 0);
+
+ spu_release(ctx);
+}
+
Code Review / kvmfornfv.git / blobdiff