4 * (C) Copyright IBM Deutschland Entwicklung GmbH 2005
6 * Author: Arnd Bergmann <arndb@de.ibm.com>
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2, or (at your option)
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
25 #include <linux/kref.h>
26 #include <linux/mutex.h>
27 #include <linux/spinlock.h>
29 #include <linux/cpumask.h>
32 #include <asm/spu_csa.h>
33 #include <asm/spu_info.h>
35 /* The magic number for our file system */
37 SPUFS_MAGIC = 0x23c9b64e,
40 struct spu_context_ops;
44 struct spu *spu; /* pointer to a physical SPU */
45 struct spu_state csa; /* SPU context save area. */
46 spinlock_t mmio_lock; /* protects mmio access */
47 struct address_space *local_store; /* local store mapping. */
48 struct address_space *mfc; /* 'mfc' area mappings. */
49 struct address_space *cntl; /* 'control' area mappings. */
50 struct address_space *signal1; /* 'signal1' area mappings. */
51 struct address_space *signal2; /* 'signal2' area mappings. */
52 struct address_space *mss; /* 'mss' area mappings. */
53 struct address_space *psmap; /* 'psmap' area mappings. */
54 struct mutex mapping_lock;
55 u64 object_id; /* user space pointer for oprofile */
57 enum { SPU_STATE_RUNNABLE, SPU_STATE_SAVED } state;
58 struct mutex state_mutex;
59 struct mutex run_mutex;
61 struct mm_struct *owner;
64 wait_queue_head_t ibox_wq;
65 wait_queue_head_t wbox_wq;
66 wait_queue_head_t stop_wq;
67 wait_queue_head_t mfc_wq;
68 struct fasync_struct *ibox_fasync;
69 struct fasync_struct *wbox_fasync;
70 struct fasync_struct *mfc_fasync;
72 struct spu_context_ops *ops;
73 struct work_struct reap_work;
75 unsigned long event_return;
77 struct list_head gang_list;
78 struct spu_gang *gang;
83 /* scheduler fields */
85 unsigned int time_slice;
86 unsigned long sched_flags;
87 cpumask_t cpus_allowed;
93 /* updates protected by ctx->state_mutex */
94 enum spu_utilization_state util_state;
95 unsigned long long tstamp; /* time of last state switch */
96 unsigned long long times[SPU_UTIL_MAX];
97 unsigned long long vol_ctx_switch;
98 unsigned long long invol_ctx_switch;
99 unsigned long long min_flt;
100 unsigned long long maj_flt;
101 unsigned long long hash_flt;
102 unsigned long long slb_flt;
103 unsigned long long slb_flt_base; /* # at last ctx switch */
104 unsigned long long class2_intr;
105 unsigned long long class2_intr_base; /* # at last ctx switch */
106 unsigned long long libassist;
111 struct list_head list;
117 struct mfc_dma_command {
118 int32_t pad; /* reserved */
119 uint32_t lsa; /* local storage address */
120 uint64_t ea; /* effective address */
121 uint16_t size; /* transfer size */
122 uint16_t tag; /* command tag */
123 uint16_t class; /* class ID */
124 uint16_t cmd; /* command opcode */
128 /* SPU context query/set operations. */
129 struct spu_context_ops {
130 int (*mbox_read) (struct spu_context * ctx, u32 * data);
131 u32(*mbox_stat_read) (struct spu_context * ctx);
132 unsigned int (*mbox_stat_poll)(struct spu_context *ctx,
133 unsigned int events);
134 int (*ibox_read) (struct spu_context * ctx, u32 * data);
135 int (*wbox_write) (struct spu_context * ctx, u32 data);
136 u32(*signal1_read) (struct spu_context * ctx);
137 void (*signal1_write) (struct spu_context * ctx, u32 data);
138 u32(*signal2_read) (struct spu_context * ctx);
139 void (*signal2_write) (struct spu_context * ctx, u32 data);
140 void (*signal1_type_set) (struct spu_context * ctx, u64 val);
141 u64(*signal1_type_get) (struct spu_context * ctx);
142 void (*signal2_type_set) (struct spu_context * ctx, u64 val);
143 u64(*signal2_type_get) (struct spu_context * ctx);
144 u32(*npc_read) (struct spu_context * ctx);
145 void (*npc_write) (struct spu_context * ctx, u32 data);
146 u32(*status_read) (struct spu_context * ctx);
147 char*(*get_ls) (struct spu_context * ctx);
148 u32 (*runcntl_read) (struct spu_context * ctx);
149 void (*runcntl_write) (struct spu_context * ctx, u32 data);
150 void (*master_start) (struct spu_context * ctx);
151 void (*master_stop) (struct spu_context * ctx);
152 int (*set_mfc_query)(struct spu_context * ctx, u32 mask, u32 mode);
153 u32 (*read_mfc_tagstatus)(struct spu_context * ctx);
154 u32 (*get_mfc_free_elements)(struct spu_context *ctx);
155 int (*send_mfc_command)(struct spu_context * ctx,
156 struct mfc_dma_command * cmd);
157 void (*dma_info_read) (struct spu_context * ctx,
158 struct spu_dma_info * info);
159 void (*proxydma_info_read) (struct spu_context * ctx,
160 struct spu_proxydma_info * info);
161 void (*restart_dma)(struct spu_context *ctx);
164 extern struct spu_context_ops spu_hw_ops;
165 extern struct spu_context_ops spu_backing_ops;
167 struct spufs_inode_info {
168 struct spu_context *i_ctx;
169 struct spu_gang *i_gang;
170 struct inode vfs_inode;
173 #define SPUFS_I(inode) \
174 container_of(inode, struct spufs_inode_info, vfs_inode)
176 extern struct tree_descr spufs_dir_contents[];
177 extern struct tree_descr spufs_dir_nosched_contents[];
179 /* system call implementation */
180 long spufs_run_spu(struct file *file,
181 struct spu_context *ctx, u32 *npc, u32 *status);
182 long spufs_create(struct nameidata *nd,
183 unsigned int flags, mode_t mode);
184 extern const struct file_operations spufs_context_fops;
186 /* gang management */
187 struct spu_gang *alloc_spu_gang(void);
188 struct spu_gang *get_spu_gang(struct spu_gang *gang);
189 int put_spu_gang(struct spu_gang *gang);
190 void spu_gang_remove_ctx(struct spu_gang *gang, struct spu_context *ctx);
191 void spu_gang_add_ctx(struct spu_gang *gang, struct spu_context *ctx);
194 int spufs_handle_class1(struct spu_context *ctx);
196 /* context management */
197 extern atomic_t nr_spu_contexts;
198 static inline void spu_acquire(struct spu_context *ctx)
200 mutex_lock(&ctx->state_mutex);
203 static inline void spu_release(struct spu_context *ctx)
205 mutex_unlock(&ctx->state_mutex);
208 struct spu_context * alloc_spu_context(struct spu_gang *gang);
209 void destroy_spu_context(struct kref *kref);
210 struct spu_context * get_spu_context(struct spu_context *ctx);
211 int put_spu_context(struct spu_context *ctx);
212 void spu_unmap_mappings(struct spu_context *ctx);
214 void spu_forget(struct spu_context *ctx);
215 int spu_acquire_runnable(struct spu_context *ctx, unsigned long flags);
216 void spu_acquire_saved(struct spu_context *ctx);
218 int spu_activate(struct spu_context *ctx, unsigned long flags);
219 void spu_deactivate(struct spu_context *ctx);
220 void spu_yield(struct spu_context *ctx);
221 void spu_set_timeslice(struct spu_context *ctx);
222 void spu_update_sched_info(struct spu_context *ctx);
223 void __spu_update_sched_info(struct spu_context *ctx);
224 int __init spu_sched_init(void);
225 void spu_sched_exit(void);
227 extern char *isolated_loader;
231 * Same as wait_event_interruptible(), except that here
232 * we need to call spu_release(ctx) before sleeping, and
233 * then spu_acquire(ctx) when awoken.
236 #define spufs_wait(wq, condition) \
239 DEFINE_WAIT(__wait); \
241 prepare_to_wait(&(wq), &__wait, TASK_INTERRUPTIBLE); \
244 if (signal_pending(current)) { \
245 __ret = -ERESTARTSYS; \
252 finish_wait(&(wq), &__wait); \
256 size_t spu_wbox_write(struct spu_context *ctx, u32 data);
257 size_t spu_ibox_read(struct spu_context *ctx, u32 *data);
259 /* irq callback funcs. */
260 void spufs_ibox_callback(struct spu *spu);
261 void spufs_wbox_callback(struct spu *spu);
262 void spufs_stop_callback(struct spu *spu);
263 void spufs_mfc_callback(struct spu *spu);
264 void spufs_dma_callback(struct spu *spu, int type);
266 extern struct spu_coredump_calls spufs_coredump_calls;
267 struct spufs_coredump_reader {
269 ssize_t (*read)(struct spu_context *ctx,
270 char __user *buffer, size_t size, loff_t *pos);
271 u64 (*get)(void *data);
274 extern struct spufs_coredump_reader spufs_coredump_read[];
275 extern int spufs_coredump_num_notes;
278 * This function is a little bit too large for an inline, but
279 * as fault.c is built into the kernel we can't move it out of
282 static inline void spuctx_switch_state(struct spu_context *ctx,
283 enum spu_utilization_state new_state)
285 unsigned long long curtime;
286 signed long long delta;
289 enum spu_utilization_state old_state;
292 curtime = timespec_to_ns(&ts);
293 delta = curtime - ctx->stats.tstamp;
295 WARN_ON(!mutex_is_locked(&ctx->state_mutex));
299 old_state = ctx->stats.util_state;
300 ctx->stats.util_state = new_state;
301 ctx->stats.tstamp = curtime;
304 * Update the physical SPU utilization statistics.
307 ctx->stats.times[old_state] += delta;
308 spu->stats.times[old_state] += delta;
309 spu->stats.util_state = new_state;
310 spu->stats.tstamp = curtime;