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;
43 /* ctx->sched_flags */
45 SPU_SCHED_NOTIFY_ACTIVE,
46 SPU_SCHED_WAS_ACTIVE, /* was active upon spu_acquire_saved() */
50 struct spu *spu; /* pointer to a physical SPU */
51 struct spu_state csa; /* SPU context save area. */
52 spinlock_t mmio_lock; /* protects mmio access */
53 struct address_space *local_store; /* local store mapping. */
54 struct address_space *mfc; /* 'mfc' area mappings. */
55 struct address_space *cntl; /* 'control' area mappings. */
56 struct address_space *signal1; /* 'signal1' area mappings. */
57 struct address_space *signal2; /* 'signal2' area mappings. */
58 struct address_space *mss; /* 'mss' area mappings. */
59 struct address_space *psmap; /* 'psmap' area mappings. */
60 struct mutex mapping_lock;
61 u64 object_id; /* user space pointer for oprofile */
63 enum { SPU_STATE_RUNNABLE, SPU_STATE_SAVED } state;
64 struct mutex state_mutex;
65 struct mutex run_mutex;
67 struct mm_struct *owner;
70 wait_queue_head_t ibox_wq;
71 wait_queue_head_t wbox_wq;
72 wait_queue_head_t stop_wq;
73 wait_queue_head_t mfc_wq;
74 struct fasync_struct *ibox_fasync;
75 struct fasync_struct *wbox_fasync;
76 struct fasync_struct *mfc_fasync;
78 struct spu_context_ops *ops;
79 struct work_struct reap_work;
81 unsigned long event_return;
83 struct list_head gang_list;
84 struct spu_gang *gang;
85 struct kref *prof_priv_kref;
86 void ( * prof_priv_release) (struct kref *kref);
91 /* scheduler fields */
93 unsigned int time_slice;
94 unsigned long sched_flags;
95 cpumask_t cpus_allowed;
101 /* updates protected by ctx->state_mutex */
102 enum spu_utilization_state util_state;
103 unsigned long long tstamp; /* time of last state switch */
104 unsigned long long times[SPU_UTIL_MAX];
105 unsigned long long vol_ctx_switch;
106 unsigned long long invol_ctx_switch;
107 unsigned long long min_flt;
108 unsigned long long maj_flt;
109 unsigned long long hash_flt;
110 unsigned long long slb_flt;
111 unsigned long long slb_flt_base; /* # at last ctx switch */
112 unsigned long long class2_intr;
113 unsigned long long class2_intr_base; /* # at last ctx switch */
114 unsigned long long libassist;
117 struct list_head aff_list;
123 struct list_head list;
128 struct spu_context *aff_ref_ctx;
129 struct list_head aff_list_head;
130 struct mutex aff_mutex;
132 struct spu *aff_ref_spu;
133 atomic_t aff_sched_count;
136 /* Flag bits for spu_gang aff_flags */
137 #define AFF_OFFSETS_SET 1
140 struct mfc_dma_command {
141 int32_t pad; /* reserved */
142 uint32_t lsa; /* local storage address */
143 uint64_t ea; /* effective address */
144 uint16_t size; /* transfer size */
145 uint16_t tag; /* command tag */
146 uint16_t class; /* class ID */
147 uint16_t cmd; /* command opcode */
151 /* SPU context query/set operations. */
152 struct spu_context_ops {
153 int (*mbox_read) (struct spu_context * ctx, u32 * data);
154 u32(*mbox_stat_read) (struct spu_context * ctx);
155 unsigned int (*mbox_stat_poll)(struct spu_context *ctx,
156 unsigned int events);
157 int (*ibox_read) (struct spu_context * ctx, u32 * data);
158 int (*wbox_write) (struct spu_context * ctx, u32 data);
159 u32(*signal1_read) (struct spu_context * ctx);
160 void (*signal1_write) (struct spu_context * ctx, u32 data);
161 u32(*signal2_read) (struct spu_context * ctx);
162 void (*signal2_write) (struct spu_context * ctx, u32 data);
163 void (*signal1_type_set) (struct spu_context * ctx, u64 val);
164 u64(*signal1_type_get) (struct spu_context * ctx);
165 void (*signal2_type_set) (struct spu_context * ctx, u64 val);
166 u64(*signal2_type_get) (struct spu_context * ctx);
167 u32(*npc_read) (struct spu_context * ctx);
168 void (*npc_write) (struct spu_context * ctx, u32 data);
169 u32(*status_read) (struct spu_context * ctx);
170 char*(*get_ls) (struct spu_context * ctx);
171 u32 (*runcntl_read) (struct spu_context * ctx);
172 void (*runcntl_write) (struct spu_context * ctx, u32 data);
173 void (*master_start) (struct spu_context * ctx);
174 void (*master_stop) (struct spu_context * ctx);
175 int (*set_mfc_query)(struct spu_context * ctx, u32 mask, u32 mode);
176 u32 (*read_mfc_tagstatus)(struct spu_context * ctx);
177 u32 (*get_mfc_free_elements)(struct spu_context *ctx);
178 int (*send_mfc_command)(struct spu_context * ctx,
179 struct mfc_dma_command * cmd);
180 void (*dma_info_read) (struct spu_context * ctx,
181 struct spu_dma_info * info);
182 void (*proxydma_info_read) (struct spu_context * ctx,
183 struct spu_proxydma_info * info);
184 void (*restart_dma)(struct spu_context *ctx);
187 extern struct spu_context_ops spu_hw_ops;
188 extern struct spu_context_ops spu_backing_ops;
190 struct spufs_inode_info {
191 struct spu_context *i_ctx;
192 struct spu_gang *i_gang;
193 struct inode vfs_inode;
196 #define SPUFS_I(inode) \
197 container_of(inode, struct spufs_inode_info, vfs_inode)
199 extern struct tree_descr spufs_dir_contents[];
200 extern struct tree_descr spufs_dir_nosched_contents[];
202 /* system call implementation */
203 extern struct spufs_calls spufs_calls;
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 /* ELF coredump callbacks for writing SPU ELF notes */
208 extern int spufs_coredump_extra_notes_size(void);
209 extern int spufs_coredump_extra_notes_write(struct file *file, loff_t *foffset);
211 extern const struct file_operations spufs_context_fops;
213 /* gang management */
214 struct spu_gang *alloc_spu_gang(void);
215 struct spu_gang *get_spu_gang(struct spu_gang *gang);
216 int put_spu_gang(struct spu_gang *gang);
217 void spu_gang_remove_ctx(struct spu_gang *gang, struct spu_context *ctx);
218 void spu_gang_add_ctx(struct spu_gang *gang, struct spu_context *ctx);
221 int spufs_handle_class1(struct spu_context *ctx);
224 struct spu *affinity_check(struct spu_context *ctx);
226 /* context management */
227 extern atomic_t nr_spu_contexts;
228 static inline void spu_acquire(struct spu_context *ctx)
230 mutex_lock(&ctx->state_mutex);
233 static inline void spu_release(struct spu_context *ctx)
235 mutex_unlock(&ctx->state_mutex);
238 struct spu_context * alloc_spu_context(struct spu_gang *gang);
239 void destroy_spu_context(struct kref *kref);
240 struct spu_context * get_spu_context(struct spu_context *ctx);
241 int put_spu_context(struct spu_context *ctx);
242 void spu_unmap_mappings(struct spu_context *ctx);
244 void spu_forget(struct spu_context *ctx);
245 int spu_acquire_runnable(struct spu_context *ctx, unsigned long flags);
246 void spu_acquire_saved(struct spu_context *ctx);
247 void spu_release_saved(struct spu_context *ctx);
249 int spu_activate(struct spu_context *ctx, unsigned long flags);
250 void spu_deactivate(struct spu_context *ctx);
251 void spu_yield(struct spu_context *ctx);
252 void spu_switch_notify(struct spu *spu, struct spu_context *ctx);
253 void spu_set_timeslice(struct spu_context *ctx);
254 void spu_update_sched_info(struct spu_context *ctx);
255 void __spu_update_sched_info(struct spu_context *ctx);
256 int __init spu_sched_init(void);
257 void spu_sched_exit(void);
259 extern char *isolated_loader;
263 * Same as wait_event_interruptible(), except that here
264 * we need to call spu_release(ctx) before sleeping, and
265 * then spu_acquire(ctx) when awoken.
268 #define spufs_wait(wq, condition) \
271 DEFINE_WAIT(__wait); \
273 prepare_to_wait(&(wq), &__wait, TASK_INTERRUPTIBLE); \
276 if (signal_pending(current)) { \
277 __ret = -ERESTARTSYS; \
284 finish_wait(&(wq), &__wait); \
288 size_t spu_wbox_write(struct spu_context *ctx, u32 data);
289 size_t spu_ibox_read(struct spu_context *ctx, u32 *data);
291 /* irq callback funcs. */
292 void spufs_ibox_callback(struct spu *spu);
293 void spufs_wbox_callback(struct spu *spu);
294 void spufs_stop_callback(struct spu *spu);
295 void spufs_mfc_callback(struct spu *spu);
296 void spufs_dma_callback(struct spu *spu, int type);
298 extern struct spu_coredump_calls spufs_coredump_calls;
299 struct spufs_coredump_reader {
301 ssize_t (*read)(struct spu_context *ctx,
302 char __user *buffer, size_t size, loff_t *pos);
303 u64 (*get)(struct spu_context *ctx);
306 extern struct spufs_coredump_reader spufs_coredump_read[];
307 extern int spufs_coredump_num_notes;
310 * This function is a little bit too large for an inline, but
311 * as fault.c is built into the kernel we can't move it out of
314 static inline void spuctx_switch_state(struct spu_context *ctx,
315 enum spu_utilization_state new_state)
317 unsigned long long curtime;
318 signed long long delta;
321 enum spu_utilization_state old_state;
324 curtime = timespec_to_ns(&ts);
325 delta = curtime - ctx->stats.tstamp;
327 WARN_ON(!mutex_is_locked(&ctx->state_mutex));
331 old_state = ctx->stats.util_state;
332 ctx->stats.util_state = new_state;
333 ctx->stats.tstamp = curtime;
336 * Update the physical SPU utilization statistics.
339 ctx->stats.times[old_state] += delta;
340 spu->stats.times[old_state] += delta;
341 spu->stats.util_state = new_state;
342 spu->stats.tstamp = curtime;