164 lines
5.0 KiB
C
164 lines
5.0 KiB
C
/*
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* SPU file system
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*
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* (C) Copyright IBM Deutschland Entwicklung GmbH 2005
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*
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* Author: Arnd Bergmann <arndb@de.ibm.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#ifndef SPUFS_H
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#define SPUFS_H
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#include <linux/kref.h>
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#include <linux/rwsem.h>
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#include <linux/spinlock.h>
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#include <linux/fs.h>
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#include <asm/spu.h>
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#include <asm/spu_csa.h>
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/* The magic number for our file system */
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enum {
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SPUFS_MAGIC = 0x23c9b64e,
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};
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struct spu_context_ops;
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#define SPU_CONTEXT_PREEMPT 0UL
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struct spu_context {
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struct spu *spu; /* pointer to a physical SPU */
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struct spu_state csa; /* SPU context save area. */
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spinlock_t mmio_lock; /* protects mmio access */
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struct address_space *local_store;/* local store backing store */
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enum { SPU_STATE_RUNNABLE, SPU_STATE_SAVED } state;
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struct rw_semaphore state_sema;
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struct semaphore run_sema;
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struct mm_struct *owner;
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struct kref kref;
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wait_queue_head_t ibox_wq;
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wait_queue_head_t wbox_wq;
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wait_queue_head_t stop_wq;
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struct fasync_struct *ibox_fasync;
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struct fasync_struct *wbox_fasync;
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struct spu_context_ops *ops;
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struct work_struct reap_work;
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u64 flags;
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};
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/* SPU context query/set operations. */
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struct spu_context_ops {
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int (*mbox_read) (struct spu_context * ctx, u32 * data);
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u32(*mbox_stat_read) (struct spu_context * ctx);
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unsigned int (*mbox_stat_poll)(struct spu_context *ctx,
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unsigned int events);
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int (*ibox_read) (struct spu_context * ctx, u32 * data);
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int (*wbox_write) (struct spu_context * ctx, u32 data);
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u32(*signal1_read) (struct spu_context * ctx);
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void (*signal1_write) (struct spu_context * ctx, u32 data);
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u32(*signal2_read) (struct spu_context * ctx);
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void (*signal2_write) (struct spu_context * ctx, u32 data);
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void (*signal1_type_set) (struct spu_context * ctx, u64 val);
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u64(*signal1_type_get) (struct spu_context * ctx);
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void (*signal2_type_set) (struct spu_context * ctx, u64 val);
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u64(*signal2_type_get) (struct spu_context * ctx);
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u32(*npc_read) (struct spu_context * ctx);
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void (*npc_write) (struct spu_context * ctx, u32 data);
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u32(*status_read) (struct spu_context * ctx);
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char*(*get_ls) (struct spu_context * ctx);
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void (*runcntl_write) (struct spu_context * ctx, u32 data);
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void (*runcntl_stop) (struct spu_context * ctx);
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};
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extern struct spu_context_ops spu_hw_ops;
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extern struct spu_context_ops spu_backing_ops;
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struct spufs_inode_info {
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struct spu_context *i_ctx;
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struct inode vfs_inode;
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};
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#define SPUFS_I(inode) \
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container_of(inode, struct spufs_inode_info, vfs_inode)
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extern struct tree_descr spufs_dir_contents[];
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/* system call implementation */
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long spufs_run_spu(struct file *file,
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struct spu_context *ctx, u32 *npc, u32 *status);
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long spufs_create_thread(struct nameidata *nd,
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unsigned int flags, mode_t mode);
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extern struct file_operations spufs_context_fops;
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/* context management */
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struct spu_context * alloc_spu_context(struct address_space *local_store);
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void destroy_spu_context(struct kref *kref);
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struct spu_context * get_spu_context(struct spu_context *ctx);
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int put_spu_context(struct spu_context *ctx);
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void spu_unmap_mappings(struct spu_context *ctx);
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void spu_forget(struct spu_context *ctx);
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void spu_acquire(struct spu_context *ctx);
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void spu_release(struct spu_context *ctx);
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int spu_acquire_runnable(struct spu_context *ctx);
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void spu_acquire_saved(struct spu_context *ctx);
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int spu_activate(struct spu_context *ctx, u64 flags);
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void spu_deactivate(struct spu_context *ctx);
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void spu_yield(struct spu_context *ctx);
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int __init spu_sched_init(void);
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void __exit spu_sched_exit(void);
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/*
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* spufs_wait
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* Same as wait_event_interruptible(), except that here
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* we need to call spu_release(ctx) before sleeping, and
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* then spu_acquire(ctx) when awoken.
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*/
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#define spufs_wait(wq, condition) \
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({ \
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int __ret = 0; \
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DEFINE_WAIT(__wait); \
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for (;;) { \
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prepare_to_wait(&(wq), &__wait, TASK_INTERRUPTIBLE); \
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if (condition) \
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break; \
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if (!signal_pending(current)) { \
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spu_release(ctx); \
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schedule(); \
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spu_acquire(ctx); \
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continue; \
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} \
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__ret = -ERESTARTSYS; \
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break; \
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} \
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finish_wait(&(wq), &__wait); \
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__ret; \
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})
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size_t spu_wbox_write(struct spu_context *ctx, u32 data);
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size_t spu_ibox_read(struct spu_context *ctx, u32 *data);
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/* irq callback funcs. */
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void spufs_ibox_callback(struct spu *spu);
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void spufs_wbox_callback(struct spu *spu);
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void spufs_stop_callback(struct spu *spu);
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#endif
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