3a843d7cd3
Handling mailbox interrupts was broken in multiple respects, the combination of which was hiding the bugs most of the time. - The ibox interrupt mask was open initially even though there are no waiters on a newly created SPU. - Acknowledging the mailbox interrupt did not work because it is level triggered and the mailbox data is never retrieved from inside the interrupt handler. - The interrupt handler delivered interrupts with a disabled mask if another interrupt is triggered for the same class but a different mask. - The poll function did not enable the interrupt if it had not been enabled, so we might run into the poll timeout if none of the other bugs saved us and no signal was delivered. We probably still have a similar problem with blocking read/write on mailbox files, but that will result in extra wakeup in the worst case, not in incorrect behaviour. Signed-off-by: Arnd Bergmann <arndb@de.ibm.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
134 lines
4.4 KiB
C
134 lines
4.4 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_nr 0UL
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#define SPU_CONTEXT_PREEMPT (1UL << SPU_CONTEXT_PREEMPT_nr)
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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 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, const char *name,
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unsigned int flags, mode_t mode);
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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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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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