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() */
47 /* ctx->sched_flags */
49 SPU_SCHED_NOTIFY_ACTIVE,
53 struct spu *spu; /* pointer to a physical SPU */
54 struct spu_state csa; /* SPU context save area. */
55 spinlock_t mmio_lock; /* protects mmio access */
56 struct address_space *local_store; /* local store mapping. */
57 struct address_space *mfc; /* 'mfc' area mappings. */
58 struct address_space *cntl; /* 'control' area mappings. */
59 struct address_space *signal1; /* 'signal1' area mappings. */
60 struct address_space *signal2; /* 'signal2' area mappings. */
61 struct address_space *mss; /* 'mss' area mappings. */
62 struct address_space *psmap; /* 'psmap' area mappings. */
63 struct mutex mapping_lock;
64 u64 object_id; /* user space pointer for oprofile */
66 enum { SPU_STATE_RUNNABLE, SPU_STATE_SAVED } state;
67 struct mutex state_mutex;
68 struct mutex run_mutex;
70 struct mm_struct *owner;
73 wait_queue_head_t ibox_wq;
74 wait_queue_head_t wbox_wq;
75 wait_queue_head_t stop_wq;
76 wait_queue_head_t mfc_wq;
77 struct fasync_struct *ibox_fasync;
78 struct fasync_struct *wbox_fasync;
79 struct fasync_struct *mfc_fasync;
81 struct spu_context_ops *ops;
82 struct work_struct reap_work;
84 unsigned long event_return;
86 struct list_head gang_list;
87 struct spu_gang *gang;
92 /* scheduler fields */
94 unsigned int time_slice;
95 unsigned long sched_flags;
96 cpumask_t cpus_allowed;
102 /* updates protected by ctx->state_mutex */
103 enum spu_utilization_state util_state;
104 unsigned long long tstamp; /* time of last state switch */
105 unsigned long long times[SPU_UTIL_MAX];
106 unsigned long long vol_ctx_switch;
107 unsigned long long invol_ctx_switch;
108 unsigned long long min_flt;
109 unsigned long long maj_flt;
110 unsigned long long hash_flt;
111 unsigned long long slb_flt;
112 unsigned long long slb_flt_base; /* # at last ctx switch */
113 unsigned long long class2_intr;
114 unsigned long long class2_intr_base; /* # at last ctx switch */
115 unsigned long long libassist;
118 struct list_head aff_list;
124 struct list_head list;
129 struct spu_context *aff_ref_ctx;
130 struct list_head aff_list_head;
131 struct mutex aff_mutex;
133 struct spu *aff_ref_spu;
134 atomic_t aff_sched_count;
137 /* Flag bits for spu_gang aff_flags */
138 #define AFF_OFFSETS_SET 1
141 struct mfc_dma_command {
142 int32_t pad; /* reserved */
143 uint32_t lsa; /* local storage address */
144 uint64_t ea; /* effective address */
145 uint16_t size; /* transfer size */
146 uint16_t tag; /* command tag */
147 uint16_t class; /* class ID */
148 uint16_t cmd; /* command opcode */
152 /* SPU context query/set operations. */
153 struct spu_context_ops {
154 int (*mbox_read) (struct spu_context * ctx, u32 * data);
155 u32(*mbox_stat_read) (struct spu_context * ctx);
156 unsigned int (*mbox_stat_poll)(struct spu_context *ctx,
157 unsigned int events);
158 int (*ibox_read) (struct spu_context * ctx, u32 * data);
159 int (*wbox_write) (struct spu_context * ctx, u32 data);
160 u32(*signal1_read) (struct spu_context * ctx);
161 void (*signal1_write) (struct spu_context * ctx, u32 data);
162 u32(*signal2_read) (struct spu_context * ctx);
163 void (*signal2_write) (struct spu_context * ctx, u32 data);
164 void (*signal1_type_set) (struct spu_context * ctx, u64 val);
165 u64(*signal1_type_get) (struct spu_context * ctx);
166 void (*signal2_type_set) (struct spu_context * ctx, u64 val);
167 u64(*signal2_type_get) (struct spu_context * ctx);
168 u32(*npc_read) (struct spu_context * ctx);
169 void (*npc_write) (struct spu_context * ctx, u32 data);
170 u32(*status_read) (struct spu_context * ctx);
171 char*(*get_ls) (struct spu_context * ctx);
172 u32 (*runcntl_read) (struct spu_context * ctx);
173 void (*runcntl_write) (struct spu_context * ctx, u32 data);
174 void (*master_start) (struct spu_context * ctx);
175 void (*master_stop) (struct spu_context * ctx);
176 int (*set_mfc_query)(struct spu_context * ctx, u32 mask, u32 mode);
177 u32 (*read_mfc_tagstatus)(struct spu_context * ctx);
178 u32 (*get_mfc_free_elements)(struct spu_context *ctx);
179 int (*send_mfc_command)(struct spu_context * ctx,
180 struct mfc_dma_command * cmd);
181 void (*dma_info_read) (struct spu_context * ctx,
182 struct spu_dma_info * info);
183 void (*proxydma_info_read) (struct spu_context * ctx,
184 struct spu_proxydma_info * info);
185 void (*restart_dma)(struct spu_context *ctx);
188 extern struct spu_context_ops spu_hw_ops;
189 extern struct spu_context_ops spu_backing_ops;
191 struct spufs_inode_info {
192 struct spu_context *i_ctx;
193 struct spu_gang *i_gang;
194 struct inode vfs_inode;
197 #define SPUFS_I(inode) \
198 container_of(inode, struct spufs_inode_info, vfs_inode)
200 extern struct tree_descr spufs_dir_contents[];
201 extern struct tree_descr spufs_dir_nosched_contents[];
203 /* system call implementation */
204 long spufs_run_spu(struct spu_context *ctx, u32 *npc, u32 *status);
205 long spufs_create(struct nameidata *nd, unsigned int flags,
206 mode_t mode, struct file *filp);
207 extern const struct file_operations spufs_context_fops;
209 /* gang management */
210 struct spu_gang *alloc_spu_gang(void);
211 struct spu_gang *get_spu_gang(struct spu_gang *gang);
212 int put_spu_gang(struct spu_gang *gang);
213 void spu_gang_remove_ctx(struct spu_gang *gang, struct spu_context *ctx);
214 void spu_gang_add_ctx(struct spu_gang *gang, struct spu_context *ctx);
217 int spufs_handle_class1(struct spu_context *ctx);
220 struct spu *affinity_check(struct spu_context *ctx);
222 /* context management */
223 extern atomic_t nr_spu_contexts;
224 static inline void spu_acquire(struct spu_context *ctx)
226 mutex_lock(&ctx->state_mutex);
229 static inline void spu_release(struct spu_context *ctx)
231 mutex_unlock(&ctx->state_mutex);
234 struct spu_context * alloc_spu_context(struct spu_gang *gang);
235 void destroy_spu_context(struct kref *kref);
236 struct spu_context * get_spu_context(struct spu_context *ctx);
237 int put_spu_context(struct spu_context *ctx);
238 void spu_unmap_mappings(struct spu_context *ctx);
240 void spu_forget(struct spu_context *ctx);
241 int spu_acquire_runnable(struct spu_context *ctx, unsigned long flags);
242 void spu_acquire_saved(struct spu_context *ctx);
243 void spu_release_saved(struct spu_context *ctx);
245 int spu_activate(struct spu_context *ctx, unsigned long flags);
246 void spu_deactivate(struct spu_context *ctx);
247 void spu_yield(struct spu_context *ctx);
248 void spu_switch_notify(struct spu *spu, struct spu_context *ctx);
249 void spu_set_timeslice(struct spu_context *ctx);
250 void spu_update_sched_info(struct spu_context *ctx);
251 void __spu_update_sched_info(struct spu_context *ctx);
252 int __init spu_sched_init(void);
253 void spu_sched_exit(void);
255 extern char *isolated_loader;
259 * Same as wait_event_interruptible(), except that here
260 * we need to call spu_release(ctx) before sleeping, and
261 * then spu_acquire(ctx) when awoken.
264 #define spufs_wait(wq, condition) \
267 DEFINE_WAIT(__wait); \
269 prepare_to_wait(&(wq), &__wait, TASK_INTERRUPTIBLE); \
272 if (signal_pending(current)) { \
273 __ret = -ERESTARTSYS; \
280 finish_wait(&(wq), &__wait); \
284 size_t spu_wbox_write(struct spu_context *ctx, u32 data);
285 size_t spu_ibox_read(struct spu_context *ctx, u32 *data);
287 /* irq callback funcs. */
288 void spufs_ibox_callback(struct spu *spu);
289 void spufs_wbox_callback(struct spu *spu);
290 void spufs_stop_callback(struct spu *spu);
291 void spufs_mfc_callback(struct spu *spu);
292 void spufs_dma_callback(struct spu *spu, int type);
294 extern struct spu_coredump_calls spufs_coredump_calls;
295 struct spufs_coredump_reader {
297 ssize_t (*read)(struct spu_context *ctx,
298 char __user *buffer, size_t size, loff_t *pos);
299 u64 (*get)(void *data);
302 extern struct spufs_coredump_reader spufs_coredump_read[];
303 extern int spufs_coredump_num_notes;
306 * This function is a little bit too large for an inline, but
307 * as fault.c is built into the kernel we can't move it out of
310 static inline void spuctx_switch_state(struct spu_context *ctx,
311 enum spu_utilization_state new_state)
313 unsigned long long curtime;
314 signed long long delta;
317 enum spu_utilization_state old_state;
320 curtime = timespec_to_ns(&ts);
321 delta = curtime - ctx->stats.tstamp;
323 WARN_ON(!mutex_is_locked(&ctx->state_mutex));
327 old_state = ctx->stats.util_state;
328 ctx->stats.util_state = new_state;
329 ctx->stats.tstamp = curtime;
332 * Update the physical SPU utilization statistics.
335 ctx->stats.times[old_state] += delta;
336 spu->stats.times[old_state] += delta;
337 spu->stats.util_state = new_state;
338 spu->stats.tstamp = curtime;