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/*
* 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/slab.h>
#include <asm/spu.h>
#include <asm/spu_csa.h>
#include "spufs.h"
struct spu_context *alloc_spu_context(void)
{
struct spu_context *ctx;
ctx = kmalloc(sizeof *ctx, GFP_KERNEL);
if (!ctx)
goto out;
/* Future enhancement: do not call spu_alloc()
* here. This step should be deferred until
* spu_run()!!
*
* More work needs to be done to read(),
* write(), mmap(), etc., so that operations
* are performed on CSA when the context is
* not currently being run. In this way we
* can support arbitrarily large number of
* entries in /spu, allow state queries, etc.
*/
ctx->spu = spu_alloc();
if (!ctx->spu)
goto out_free;
spu_init_csa(&ctx->csa);
if (!ctx->csa.lscsa) {
spu_free(ctx->spu);
goto out_free;
}
init_rwsem(&ctx->backing_sema);
spin_lock_init(&ctx->mmio_lock);
kref_init(&ctx->kref);
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);
if (ctx->spu)
spu_free(ctx->spu);
spu_fini_csa(&ctx->csa);
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);
}
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