| /* |
| * 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); |
| } |
| |
| |