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 SPU_SCHED_WAS_ACTIVE, /* was active upon spu_acquire_saved() */
48 struct spu *spu; /* pointer to a physical SPU */
49 struct spu_state csa; /* SPU context save area. */
50 spinlock_t mmio_lock; /* protects mmio access */
51 struct address_space *local_store; /* local store mapping. */
52 struct address_space *mfc; /* 'mfc' area mappings. */
53 struct address_space *cntl; /* 'control' area mappings. */
54 struct address_space *signal1; /* 'signal1' area mappings. */
55 struct address_space *signal2; /* 'signal2' area mappings. */
56 struct address_space *mss; /* 'mss' area mappings. */
57 struct address_space *psmap; /* 'psmap' area mappings. */
58 struct mutex mapping_lock;
59 u64 object_id; /* user space pointer for oprofile */
61 enum { SPU_STATE_RUNNABLE, SPU_STATE_SAVED } state;
62 struct mutex state_mutex;
63 struct mutex run_mutex;
65 struct mm_struct *owner;
68 wait_queue_head_t ibox_wq;
69 wait_queue_head_t wbox_wq;
70 wait_queue_head_t stop_wq;
71 wait_queue_head_t mfc_wq;
72 struct fasync_struct *ibox_fasync;
73 struct fasync_struct *wbox_fasync;
74 struct fasync_struct *mfc_fasync;
76 struct spu_context_ops *ops;
77 struct work_struct reap_work;
79 unsigned long event_return;
81 struct list_head gang_list;
82 struct spu_gang *gang;
87 /* scheduler fields */
89 unsigned int time_slice;
90 unsigned long sched_flags;
91 cpumask_t cpus_allowed;
97 /* updates protected by ctx->state_mutex */
98 enum spu_utilization_state util_state;
99 unsigned long long tstamp; /* time of last state switch */
100 unsigned long long times[SPU_UTIL_MAX];
101 unsigned long long vol_ctx_switch;
102 unsigned long long invol_ctx_switch;
103 unsigned long long min_flt;
104 unsigned long long maj_flt;
105 unsigned long long hash_flt;
106 unsigned long long slb_flt;
107 unsigned long long slb_flt_base; /* # at last ctx switch */
108 unsigned long long class2_intr;
109 unsigned long long class2_intr_base; /* # at last ctx switch */
110 unsigned long long libassist;
113 struct list_head aff_list;
119 struct list_head list;
124 struct spu_context *aff_ref_ctx;
125 struct list_head aff_list_head;
126 struct mutex aff_mutex;
128 struct spu *aff_ref_spu;
129 atomic_t aff_sched_count;
132 /* Flag bits for spu_gang aff_flags */
133 #define AFF_OFFSETS_SET 1
136 struct mfc_dma_command {
137 int32_t pad; /* reserved */
138 uint32_t lsa; /* local storage address */
139 uint64_t ea; /* effective address */
140 uint16_t size; /* transfer size */
141 uint16_t tag; /* command tag */
142 uint16_t class; /* class ID */
143 uint16_t cmd; /* command opcode */
147 /* SPU context query/set operations. */
148 struct spu_context_ops {
149 int (*mbox_read) (struct spu_context * ctx, u32 * data);
150 u32(*mbox_stat_read) (struct spu_context * ctx);
151 unsigned int (*mbox_stat_poll)(struct spu_context *ctx,
152 unsigned int events);
153 int (*ibox_read) (struct spu_context * ctx, u32 * data);
154 int (*wbox_write) (struct spu_context * ctx, u32 data);
155 u32(*signal1_read) (struct spu_context * ctx);
156 void (*signal1_write) (struct spu_context * ctx, u32 data);
157 u32(*signal2_read) (struct spu_context * ctx);
158 void (*signal2_write) (struct spu_context * ctx, u32 data);
159 void (*signal1_type_set) (struct spu_context * ctx, u64 val);
160 u64(*signal1_type_get) (struct spu_context * ctx);
161 void (*signal2_type_set) (struct spu_context * ctx, u64 val);
162 u64(*signal2_type_get) (struct spu_context * ctx);
163 u32(*npc_read) (struct spu_context * ctx);
164 void (*npc_write) (struct spu_context * ctx, u32 data);
165 u32(*status_read) (struct spu_context * ctx);
166 char*(*get_ls) (struct spu_context * ctx);
167 u32 (*runcntl_read) (struct spu_context * ctx);
168 void (*runcntl_write) (struct spu_context * ctx, u32 data);
169 void (*master_start) (struct spu_context * ctx);
170 void (*master_stop) (struct spu_context * ctx);
171 int (*set_mfc_query)(struct spu_context * ctx, u32 mask, u32 mode);
172 u32 (*read_mfc_tagstatus)(struct spu_context * ctx);
173 u32 (*get_mfc_free_elements)(struct spu_context *ctx);
174 int (*send_mfc_command)(struct spu_context * ctx,
175 struct mfc_dma_command * cmd);
176 void (*dma_info_read) (struct spu_context * ctx,
177 struct spu_dma_info * info);
178 void (*proxydma_info_read) (struct spu_context * ctx,
179 struct spu_proxydma_info * info);
180 void (*restart_dma)(struct spu_context *ctx);
183 extern struct spu_context_ops spu_hw_ops;
184 extern struct spu_context_ops spu_backing_ops;
186 struct spufs_inode_info {
187 struct spu_context *i_ctx;
188 struct spu_gang *i_gang;
189 struct inode vfs_inode;
192 #define SPUFS_I(inode) \
193 container_of(inode, struct spufs_inode_info, vfs_inode)
195 extern struct tree_descr spufs_dir_contents[];
196 extern struct tree_descr spufs_dir_nosched_contents[];
198 /* system call implementation */
199 long spufs_run_spu(struct spu_context *ctx, u32 *npc, u32 *status);
200 long spufs_create(struct nameidata *nd, unsigned int flags,
201 mode_t mode, struct file *filp);
202 extern const struct file_operations spufs_context_fops;
204 /* gang management */
205 struct spu_gang *alloc_spu_gang(void);
206 struct spu_gang *get_spu_gang(struct spu_gang *gang);
207 int put_spu_gang(struct spu_gang *gang);
208 void spu_gang_remove_ctx(struct spu_gang *gang, struct spu_context *ctx);
209 void spu_gang_add_ctx(struct spu_gang *gang, struct spu_context *ctx);
212 int spufs_handle_class1(struct spu_context *ctx);
215 struct spu *affinity_check(struct spu_context *ctx);
217 /* context management */
218 extern atomic_t nr_spu_contexts;
219 static inline void spu_acquire(struct spu_context *ctx)
221 mutex_lock(&ctx->state_mutex);
224 static inline void spu_release(struct spu_context *ctx)
226 mutex_unlock(&ctx->state_mutex);
229 struct spu_context * alloc_spu_context(struct spu_gang *gang);
230 void destroy_spu_context(struct kref *kref);
231 struct spu_context * get_spu_context(struct spu_context *ctx);
232 int put_spu_context(struct spu_context *ctx);
233 void spu_unmap_mappings(struct spu_context *ctx);
235 void spu_forget(struct spu_context *ctx);
236 int spu_acquire_runnable(struct spu_context *ctx, unsigned long flags);
237 void spu_acquire_saved(struct spu_context *ctx);
238 void spu_release_saved(struct spu_context *ctx);
240 int spu_activate(struct spu_context *ctx, unsigned long flags);
241 void spu_deactivate(struct spu_context *ctx);
242 void spu_yield(struct spu_context *ctx);
243 void spu_set_timeslice(struct spu_context *ctx);
244 void spu_update_sched_info(struct spu_context *ctx);
245 void __spu_update_sched_info(struct spu_context *ctx);
246 int __init spu_sched_init(void);
247 void spu_sched_exit(void);
249 extern char *isolated_loader;
253 * Same as wait_event_interruptible(), except that here
254 * we need to call spu_release(ctx) before sleeping, and
255 * then spu_acquire(ctx) when awoken.
258 #define spufs_wait(wq, condition) \
261 DEFINE_WAIT(__wait); \
263 prepare_to_wait(&(wq), &__wait, TASK_INTERRUPTIBLE); \
266 if (signal_pending(current)) { \
267 __ret = -ERESTARTSYS; \
274 finish_wait(&(wq), &__wait); \
278 size_t spu_wbox_write(struct spu_context *ctx, u32 data);
279 size_t spu_ibox_read(struct spu_context *ctx, u32 *data);
281 /* irq callback funcs. */
282 void spufs_ibox_callback(struct spu *spu);
283 void spufs_wbox_callback(struct spu *spu);
284 void spufs_stop_callback(struct spu *spu);
285 void spufs_mfc_callback(struct spu *spu);
286 void spufs_dma_callback(struct spu *spu, int type);
288 extern struct spu_coredump_calls spufs_coredump_calls;
289 struct spufs_coredump_reader {
291 ssize_t (*read)(struct spu_context *ctx,
292 char __user *buffer, size_t size, loff_t *pos);
293 u64 (*get)(void *data);
296 extern struct spufs_coredump_reader spufs_coredump_read[];
297 extern int spufs_coredump_num_notes;
300 * This function is a little bit too large for an inline, but
301 * as fault.c is built into the kernel we can't move it out of
304 static inline void spuctx_switch_state(struct spu_context *ctx,
305 enum spu_utilization_state new_state)
307 unsigned long long curtime;
308 signed long long delta;
311 enum spu_utilization_state old_state;
314 curtime = timespec_to_ns(&ts);
315 delta = curtime - ctx->stats.tstamp;
317 WARN_ON(!mutex_is_locked(&ctx->state_mutex));
321 old_state = ctx->stats.util_state;
322 ctx->stats.util_state = new_state;
323 ctx->stats.tstamp = curtime;
326 * Update the physical SPU utilization statistics.
329 ctx->stats.times[old_state] += delta;
330 spu->stats.times[old_state] += delta;
331 spu->stats.util_state = new_state;
332 spu->stats.tstamp = curtime;