35 struct dtl {  struct
43 static DEFINE_PER_CPU(struct dtl, cpu_dtl);  argument
103 static int dtl_start(struct dtl *dtl)  in dtl_start()  argument
105 	struct dtl_ring *dtlr = &per_cpu(dtl_rings, dtl->cpu);  in dtl_start()
107 	dtlr->buf = dtl->buf;  in dtl_start()
108 	dtlr->buf_end = dtl->buf + dtl->buf_entries;  in dtl_start()
113 	dtlr->write_ptr = dtl->buf;  in dtl_start()
116 	dtlr->saved_dtl_mask = lppaca_of(dtl->cpu).dtl_enable_mask;  in dtl_start()
117 	lppaca_of(dtl->cpu).dtl_enable_mask |= dtl_event_mask;  in dtl_start()
124 static void dtl_stop(struct dtl *dtl)  in dtl_stop()  argument
126 	struct dtl_ring *dtlr = &per_cpu(dtl_rings, dtl->cpu);  in dtl_stop()
134 	lppaca_of(dtl->cpu).dtl_enable_mask = dtlr->saved_dtl_mask;  in dtl_stop()
140 static u64 dtl_current_index(struct dtl *dtl)  in dtl_current_index()  argument
142 	return per_cpu(dtl_rings, dtl->cpu).write_index;  in dtl_current_index()
147 static int dtl_start(struct dtl *dtl)  in dtl_start()  argument
154 	((u32 *)dtl->buf)[1] = DISPATCH_LOG_BYTES;  in dtl_start()
156 	hwcpu = get_hard_smp_processor_id(dtl->cpu);  in dtl_start()
157 	addr = __pa(dtl->buf);  in dtl_start()
161 		       "failed with %d\n", __func__, dtl->cpu, hwcpu, ret);  in dtl_start()
166 	lppaca_of(dtl->cpu).dtl_idx = 0;  in dtl_start()
173 	lppaca_of(dtl->cpu).dtl_enable_mask = dtl_event_mask;  in dtl_start()
178 static void dtl_stop(struct dtl *dtl)  in dtl_stop()  argument
180 	int hwcpu = get_hard_smp_processor_id(dtl->cpu);  in dtl_stop()
182 	lppaca_of(dtl->cpu).dtl_enable_mask = 0x0;  in dtl_stop()
187 static u64 dtl_current_index(struct dtl *dtl)  in dtl_current_index()  argument
189 	return lppaca_of(dtl->cpu).dtl_idx;  in dtl_current_index()
193 static int dtl_enable(struct dtl *dtl)  in dtl_enable()  argument
203 	if (dtl->buf)  in dtl_enable()
207 	buf = kmem_cache_alloc_node(dtl_cache, GFP_KERNEL, cpu_to_node(dtl->cpu));  in dtl_enable()
210 				__func__, dtl->cpu);  in dtl_enable()
214 	spin_lock(&dtl->lock);  in dtl_enable()
216 	if (!dtl->buf) {  in dtl_enable()
218 		dtl->buf_entries = n_entries;  in dtl_enable()
219 		dtl->buf = buf;  in dtl_enable()
220 		dtl->last_idx = 0;  in dtl_enable()
221 		rc = dtl_start(dtl);  in dtl_enable()
223 			dtl->buf = NULL;  in dtl_enable()
225 	spin_unlock(&dtl->lock);  in dtl_enable()
232 static void dtl_disable(struct dtl *dtl)  in dtl_disable()  argument
234 	spin_lock(&dtl->lock);  in dtl_disable()
235 	dtl_stop(dtl);  in dtl_disable()
236 	kmem_cache_free(dtl_cache, dtl->buf);  in dtl_disable()
237 	dtl->buf = NULL;  in dtl_disable()
238 	dtl->buf_entries = 0;  in dtl_disable()
239 	spin_unlock(&dtl->lock);  in dtl_disable()
246 	struct dtl *dtl = inode->i_private;  in dtl_file_open()  local
249 	rc = dtl_enable(dtl);  in dtl_file_open()
253 	filp->private_data = dtl;  in dtl_file_open()
259 	struct dtl *dtl = inode->i_private;  in dtl_file_release()  local
260 	dtl_disable(dtl);  in dtl_file_release()
268 	struct dtl *dtl;  in dtl_file_read()  local
274 	dtl = filp->private_data;  in dtl_file_read()
282 	spin_lock(&dtl->lock);  in dtl_file_read()
284 	cur_idx = dtl_current_index(dtl);  in dtl_file_read()
285 	last_idx = dtl->last_idx;  in dtl_file_read()
287 	if (last_idx + dtl->buf_entries <= cur_idx)  in dtl_file_read()
288 		last_idx = cur_idx - dtl->buf_entries + 1;  in dtl_file_read()
294 		dtl->last_idx = last_idx + n_req;  in dtl_file_read()
296 	spin_unlock(&dtl->lock);  in dtl_file_read()
301 	i = last_idx % dtl->buf_entries;  in dtl_file_read()
304 	if (i + n_req > dtl->buf_entries) {  in dtl_file_read()
305 		read_size = dtl->buf_entries - i;  in dtl_file_read()
307 		rc = copy_to_user(buf, &dtl->buf[i],  in dtl_file_read()
319 	rc = copy_to_user(buf, &dtl->buf[i], n_req * sizeof(struct dtl_entry));  in dtl_file_read()
337 static int dtl_setup_file(struct dtl *dtl)  in dtl_setup_file()  argument
341 	sprintf(name, "cpu-%d", dtl->cpu);  in dtl_setup_file()
343 	dtl->file = debugfs_create_file(name, 0400, dtl_dir, dtl, &dtl_fops);  in dtl_setup_file()
344 	if (!dtl->file)  in dtl_setup_file()
380 		struct dtl *dtl = &per_cpu(cpu_dtl, i);  in dtl_init()  local
381 		spin_lock_init(&dtl->lock);  in dtl_init()
382 		dtl->cpu = i;  in dtl_init()
384 		rc = dtl_setup_file(dtl);  in dtl_init()