diff options
Diffstat (limited to 'drivers/cpuidle/cpuidle.c')
-rw-r--r-- | drivers/cpuidle/cpuidle.c | 82 |
1 files changed, 41 insertions, 41 deletions
diff --git a/drivers/cpuidle/cpuidle.c b/drivers/cpuidle/cpuidle.c index a50710843378..97df791c74cb 100644 --- a/drivers/cpuidle/cpuidle.c +++ b/drivers/cpuidle/cpuidle.c | |||
@@ -154,6 +154,45 @@ void cpuidle_resume_and_unlock(void) | |||
154 | 154 | ||
155 | EXPORT_SYMBOL_GPL(cpuidle_resume_and_unlock); | 155 | EXPORT_SYMBOL_GPL(cpuidle_resume_and_unlock); |
156 | 156 | ||
157 | #ifdef CONFIG_ARCH_HAS_CPU_RELAX | ||
158 | static int poll_idle(struct cpuidle_device *dev, struct cpuidle_state *st) | ||
159 | { | ||
160 | ktime_t t1, t2; | ||
161 | s64 diff; | ||
162 | int ret; | ||
163 | |||
164 | t1 = ktime_get(); | ||
165 | local_irq_enable(); | ||
166 | while (!need_resched()) | ||
167 | cpu_relax(); | ||
168 | |||
169 | t2 = ktime_get(); | ||
170 | diff = ktime_to_us(ktime_sub(t2, t1)); | ||
171 | if (diff > INT_MAX) | ||
172 | diff = INT_MAX; | ||
173 | |||
174 | ret = (int) diff; | ||
175 | return ret; | ||
176 | } | ||
177 | |||
178 | static void poll_idle_init(struct cpuidle_device *dev) | ||
179 | { | ||
180 | struct cpuidle_state *state = &dev->states[0]; | ||
181 | |||
182 | cpuidle_set_statedata(state, NULL); | ||
183 | |||
184 | snprintf(state->name, CPUIDLE_NAME_LEN, "C0"); | ||
185 | snprintf(state->desc, CPUIDLE_DESC_LEN, "CPUIDLE CORE POLL IDLE"); | ||
186 | state->exit_latency = 0; | ||
187 | state->target_residency = 0; | ||
188 | state->power_usage = -1; | ||
189 | state->flags = CPUIDLE_FLAG_POLL; | ||
190 | state->enter = poll_idle; | ||
191 | } | ||
192 | #else | ||
193 | static void poll_idle_init(struct cpuidle_device *dev) {} | ||
194 | #endif /* CONFIG_ARCH_HAS_CPU_RELAX */ | ||
195 | |||
157 | /** | 196 | /** |
158 | * cpuidle_enable_device - enables idle PM for a CPU | 197 | * cpuidle_enable_device - enables idle PM for a CPU |
159 | * @dev: the CPU | 198 | * @dev: the CPU |
@@ -178,6 +217,8 @@ int cpuidle_enable_device(struct cpuidle_device *dev) | |||
178 | return ret; | 217 | return ret; |
179 | } | 218 | } |
180 | 219 | ||
220 | poll_idle_init(dev); | ||
221 | |||
181 | if ((ret = cpuidle_add_state_sysfs(dev))) | 222 | if ((ret = cpuidle_add_state_sysfs(dev))) |
182 | return ret; | 223 | return ret; |
183 | 224 | ||
@@ -232,45 +273,6 @@ void cpuidle_disable_device(struct cpuidle_device *dev) | |||
232 | 273 | ||
233 | EXPORT_SYMBOL_GPL(cpuidle_disable_device); | 274 | EXPORT_SYMBOL_GPL(cpuidle_disable_device); |
234 | 275 | ||
235 | #ifdef CONFIG_ARCH_HAS_CPU_RELAX | ||
236 | static int poll_idle(struct cpuidle_device *dev, struct cpuidle_state *st) | ||
237 | { | ||
238 | ktime_t t1, t2; | ||
239 | s64 diff; | ||
240 | int ret; | ||
241 | |||
242 | t1 = ktime_get(); | ||
243 | local_irq_enable(); | ||
244 | while (!need_resched()) | ||
245 | cpu_relax(); | ||
246 | |||
247 | t2 = ktime_get(); | ||
248 | diff = ktime_to_us(ktime_sub(t2, t1)); | ||
249 | if (diff > INT_MAX) | ||
250 | diff = INT_MAX; | ||
251 | |||
252 | ret = (int) diff; | ||
253 | return ret; | ||
254 | } | ||
255 | |||
256 | static void poll_idle_init(struct cpuidle_device *dev) | ||
257 | { | ||
258 | struct cpuidle_state *state = &dev->states[0]; | ||
259 | |||
260 | cpuidle_set_statedata(state, NULL); | ||
261 | |||
262 | snprintf(state->name, CPUIDLE_NAME_LEN, "C0"); | ||
263 | snprintf(state->desc, CPUIDLE_DESC_LEN, "CPUIDLE CORE POLL IDLE"); | ||
264 | state->exit_latency = 0; | ||
265 | state->target_residency = 0; | ||
266 | state->power_usage = -1; | ||
267 | state->flags = CPUIDLE_FLAG_POLL; | ||
268 | state->enter = poll_idle; | ||
269 | } | ||
270 | #else | ||
271 | static void poll_idle_init(struct cpuidle_device *dev) {} | ||
272 | #endif /* CONFIG_ARCH_HAS_CPU_RELAX */ | ||
273 | |||
274 | /** | 276 | /** |
275 | * __cpuidle_register_device - internal register function called before register | 277 | * __cpuidle_register_device - internal register function called before register |
276 | * and enable routines | 278 | * and enable routines |
@@ -291,8 +293,6 @@ static int __cpuidle_register_device(struct cpuidle_device *dev) | |||
291 | 293 | ||
292 | init_completion(&dev->kobj_unregister); | 294 | init_completion(&dev->kobj_unregister); |
293 | 295 | ||
294 | poll_idle_init(dev); | ||
295 | |||
296 | /* | 296 | /* |
297 | * cpuidle driver should set the dev->power_specified bit | 297 | * cpuidle driver should set the dev->power_specified bit |
298 | * before registering the device if the driver provides | 298 | * before registering the device if the driver provides |