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/*
* SPU file system
*
* (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.
*/
#ifndef SPUFS_H
#define SPUFS_H
#include <linux/kref.h>
#include <linux/rwsem.h>
#include <linux/spinlock.h>
#include <linux/fs.h>
#include <asm/spu.h>
#include <asm/spu_csa.h>
/* The magic number for our file system */
enum {
SPUFS_MAGIC = 0x23c9b64e,
};
struct spu_context_ops;
#define SPU_CONTEXT_PREEMPT 0UL
struct spu_gang;
struct spu_context {
struct spu *spu; /* pointer to a physical SPU */
struct spu_state csa; /* SPU context save area. */
spinlock_t mmio_lock; /* protects mmio access */
struct address_space *local_store; /* local store mapping. */
struct address_space *mfc; /* 'mfc' area mappings. */
struct address_space *cntl; /* 'control' area mappings. */
struct address_space *signal1; /* 'signal1' area mappings. */
struct address_space *signal2; /* 'signal2' area mappings. */
enum { SPU_STATE_RUNNABLE, SPU_STATE_SAVED } state;
struct rw_semaphore state_sema;
struct semaphore run_sema;
struct mm_struct *owner;
struct kref kref;
wait_queue_head_t ibox_wq;
wait_queue_head_t wbox_wq;
wait_queue_head_t stop_wq;
wait_queue_head_t mfc_wq;
struct fasync_struct *ibox_fasync;
struct fasync_struct *wbox_fasync;
struct fasync_struct *mfc_fasync;
u32 tagwait;
struct spu_context_ops *ops;
struct work_struct reap_work;
unsigned long flags;
unsigned long event_return;
struct list_head gang_list;
struct spu_gang *gang;
};
struct spu_gang {
struct list_head list;
struct mutex mutex;
struct kref kref;
int contexts;
};
struct mfc_dma_command {
int32_t pad; /* reserved */
uint32_t lsa; /* local storage address */
uint64_t ea; /* effective address */
uint16_t size; /* transfer size */
uint16_t tag; /* command tag */
uint16_t class; /* class ID */
uint16_t cmd; /* command opcode */
};
/* SPU context query/set operations. */
struct spu_context_ops {
int (*mbox_read) (struct spu_context * ctx, u32 * data);
u32(*mbox_stat_read) (struct spu_context * ctx);
unsigned int (*mbox_stat_poll)(struct spu_context *ctx,
unsigned int events);
int (*ibox_read) (struct spu_context * ctx, u32 * data);
int (*wbox_write) (struct spu_context * ctx, u32 data);
u32(*signal1_read) (struct spu_context * ctx);
void (*signal1_write) (struct spu_context * ctx, u32 data);
u32(*signal2_read) (struct spu_context * ctx);
void (*signal2_write) (struct spu_context * ctx, u32 data);
void (*signal1_type_set) (struct spu_context * ctx, u64 val);
u64(*signal1_type_get) (struct spu_context * ctx);
void (*signal2_type_set) (struct spu_context * ctx, u64 val);
u64(*signal2_type_get) (struct spu_context * ctx);
u32(*npc_read) (struct spu_context * ctx);
void (*npc_write) (struct spu_context * ctx, u32 data);
u32(*status_read) (struct spu_context * ctx);
char*(*get_ls) (struct spu_context * ctx);
void (*runcntl_write) (struct spu_context * ctx, u32 data);
void (*runcntl_stop) (struct spu_context * ctx);
int (*set_mfc_query)(struct spu_context * ctx, u32 mask, u32 mode);
u32 (*read_mfc_tagstatus)(struct spu_context * ctx);
u32 (*get_mfc_free_elements)(struct spu_context *ctx);
int (*send_mfc_command)(struct spu_context *ctx,
struct mfc_dma_command *cmd);
};
extern struct spu_context_ops spu_hw_ops;
extern struct spu_context_ops spu_backing_ops;
struct spufs_inode_info {
struct spu_context *i_ctx;
struct spu_gang *i_gang;
struct inode vfs_inode;
};
#define SPUFS_I(inode) \
container_of(inode, struct spufs_inode_info, vfs_inode)
extern struct tree_descr spufs_dir_contents[];
/* system call implementation */
long spufs_run_spu(struct file *file,
struct spu_context *ctx, u32 *npc, u32 *status);
long spufs_create(struct nameidata *nd,
unsigned int flags, mode_t mode);
extern struct file_operations spufs_context_fops;
/* gang management */
struct spu_gang *alloc_spu_gang(void);
struct spu_gang *get_spu_gang(struct spu_gang *gang);
int put_spu_gang(struct spu_gang *gang);
void spu_gang_remove_ctx(struct spu_gang *gang, struct spu_context *ctx);
void spu_gang_add_ctx(struct spu_gang *gang, struct spu_context *ctx);
/* context management */
struct spu_context * alloc_spu_context(struct spu_gang *gang);
void destroy_spu_context(struct kref *kref);
struct spu_context * get_spu_context(struct spu_context *ctx);
int put_spu_context(struct spu_context *ctx);
void spu_unmap_mappings(struct spu_context *ctx);
void spu_forget(struct spu_context *ctx);
void spu_acquire(struct spu_context *ctx);
void spu_release(struct spu_context *ctx);
int spu_acquire_runnable(struct spu_context *ctx);
void spu_acquire_saved(struct spu_context *ctx);
int spu_activate(struct spu_context *ctx, u64 flags);
void spu_deactivate(struct spu_context *ctx);
void spu_yield(struct spu_context *ctx);
int __init spu_sched_init(void);
void __exit spu_sched_exit(void);
/*
* spufs_wait
* Same as wait_event_interruptible(), except that here
* we need to call spu_release(ctx) before sleeping, and
* then spu_acquire(ctx) when awoken.
*/
#define spufs_wait(wq, condition) \
({ \
int __ret = 0; \
DEFINE_WAIT(__wait); \
for (;;) { \
prepare_to_wait(&(wq), &__wait, TASK_INTERRUPTIBLE); \
if (condition) \
break; \
if (!signal_pending(current)) { \
spu_release(ctx); \
schedule(); \
spu_acquire(ctx); \
continue; \
} \
__ret = -ERESTARTSYS; \
break; \
} \
finish_wait(&(wq), &__wait); \
__ret; \
})
size_t spu_wbox_write(struct spu_context *ctx, u32 data);
size_t spu_ibox_read(struct spu_context *ctx, u32 *data);
/* irq callback funcs. */
void spufs_ibox_callback(struct spu *spu);
void spufs_wbox_callback(struct spu *spu);
void spufs_stop_callback(struct spu *spu);
void spufs_mfc_callback(struct spu *spu);
void spufs_dma_callback(struct spu *spu, int type);
#endif
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