File: | dev/pci/drm/i915/intel_runtime_pm.c |
Warning: | line 498, column 17 Value stored to 'kdev' during its initialization is never read |
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1 | /* |
2 | * Copyright © 2012-2014 Intel Corporation |
3 | * |
4 | * Permission is hereby granted, free of charge, to any person obtaining a |
5 | * copy of this software and associated documentation files (the "Software"), |
6 | * to deal in the Software without restriction, including without limitation |
7 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
8 | * and/or sell copies of the Software, and to permit persons to whom the |
9 | * Software is furnished to do so, subject to the following conditions: |
10 | * |
11 | * The above copyright notice and this permission notice (including the next |
12 | * paragraph) shall be included in all copies or substantial portions of the |
13 | * Software. |
14 | * |
15 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
16 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
17 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
18 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
19 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING |
20 | * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS |
21 | * IN THE SOFTWARE. |
22 | * |
23 | * Authors: |
24 | * Eugeni Dodonov <eugeni.dodonov@intel.com> |
25 | * Daniel Vetter <daniel.vetter@ffwll.ch> |
26 | * |
27 | */ |
28 | |
29 | #include <linux/pm_runtime.h> |
30 | |
31 | #include <drm/drm_print.h> |
32 | |
33 | #include "i915_drv.h" |
34 | #include "i915_trace.h" |
35 | |
36 | /** |
37 | * DOC: runtime pm |
38 | * |
39 | * The i915 driver supports dynamic enabling and disabling of entire hardware |
40 | * blocks at runtime. This is especially important on the display side where |
41 | * software is supposed to control many power gates manually on recent hardware, |
42 | * since on the GT side a lot of the power management is done by the hardware. |
43 | * But even there some manual control at the device level is required. |
44 | * |
45 | * Since i915 supports a diverse set of platforms with a unified codebase and |
46 | * hardware engineers just love to shuffle functionality around between power |
47 | * domains there's a sizeable amount of indirection required. This file provides |
48 | * generic functions to the driver for grabbing and releasing references for |
49 | * abstract power domains. It then maps those to the actual power wells |
50 | * present for a given platform. |
51 | */ |
52 | |
53 | #if IS_ENABLED(CONFIG_DRM_I915_DEBUG_RUNTIME_PM)0 |
54 | |
55 | #include <linux/sort.h> |
56 | |
57 | #define STACKDEPTH 8 |
58 | |
59 | static noinline__attribute__((__noinline__)) depot_stack_handle_t __save_depot_stack(void) |
60 | { |
61 | unsigned long entries[STACKDEPTH]; |
62 | unsigned int n; |
63 | |
64 | n = stack_trace_save(entries, ARRAY_SIZE(entries)(sizeof((entries)) / sizeof((entries)[0])), 1); |
65 | return stack_depot_save(entries, n, GFP_NOWAIT0x0002 | __GFP_NOWARN0); |
66 | } |
67 | |
68 | static void __print_depot_stack(depot_stack_handle_t stack, |
69 | char *buf, int sz, int indent) |
70 | { |
71 | unsigned long *entries; |
72 | unsigned int nr_entries; |
73 | |
74 | nr_entries = stack_depot_fetch(stack, &entries); |
75 | stack_trace_snprint(buf, sz, entries, nr_entries, indent); |
76 | } |
77 | |
78 | static void init_intel_runtime_pm_wakeref(struct intel_runtime_pm *rpm) |
79 | { |
80 | mtx_init(&rpm->debug.lock, IPL_TTY)do { (void)(((void *)0)); (void)(0); __mtx_init((&rpm-> debug.lock), ((((0x9)) > 0x0 && ((0x9)) < 0x9) ? 0x9 : ((0x9)))); } while (0); |
81 | } |
82 | |
83 | static noinline__attribute__((__noinline__)) depot_stack_handle_t |
84 | track_intel_runtime_pm_wakeref(struct intel_runtime_pm *rpm) |
85 | { |
86 | depot_stack_handle_t stack, *stacks; |
87 | unsigned long flags; |
88 | |
89 | if (!rpm->available) |
90 | return -1; |
91 | |
92 | stack = __save_depot_stack(); |
93 | if (!stack) |
94 | return -1; |
95 | |
96 | spin_lock_irqsave(&rpm->debug.lock, flags)do { flags = 0; mtx_enter(&rpm->debug.lock); } while ( 0); |
97 | |
98 | if (!rpm->debug.count) |
99 | rpm->debug.last_acquire = stack; |
100 | |
101 | stacks = krealloc(rpm->debug.owners, |
102 | (rpm->debug.count + 1) * sizeof(*stacks), |
103 | GFP_NOWAIT0x0002 | __GFP_NOWARN0); |
104 | if (stacks) { |
105 | stacks[rpm->debug.count++] = stack; |
106 | rpm->debug.owners = stacks; |
107 | } else { |
108 | stack = -1; |
109 | } |
110 | |
111 | spin_unlock_irqrestore(&rpm->debug.lock, flags)do { (void)(flags); mtx_leave(&rpm->debug.lock); } while (0); |
112 | |
113 | return stack; |
114 | } |
115 | |
116 | static void untrack_intel_runtime_pm_wakeref(struct intel_runtime_pm *rpm, |
117 | depot_stack_handle_t stack) |
118 | { |
119 | struct drm_i915_privateinteldrm_softc *i915 = container_of(rpm,({ const __typeof( ((struct inteldrm_softc *)0)->runtime_pm ) *__mptr = (rpm); (struct inteldrm_softc *)( (char *)__mptr - __builtin_offsetof(struct inteldrm_softc, runtime_pm) );}) |
120 | struct drm_i915_private,({ const __typeof( ((struct inteldrm_softc *)0)->runtime_pm ) *__mptr = (rpm); (struct inteldrm_softc *)( (char *)__mptr - __builtin_offsetof(struct inteldrm_softc, runtime_pm) );}) |
121 | runtime_pm)({ const __typeof( ((struct inteldrm_softc *)0)->runtime_pm ) *__mptr = (rpm); (struct inteldrm_softc *)( (char *)__mptr - __builtin_offsetof(struct inteldrm_softc, runtime_pm) );}); |
122 | unsigned long flags, n; |
123 | bool_Bool found = false0; |
124 | |
125 | if (unlikely(stack == -1)__builtin_expect(!!(stack == -1), 0)) |
126 | return; |
127 | |
128 | spin_lock_irqsave(&rpm->debug.lock, flags)do { flags = 0; mtx_enter(&rpm->debug.lock); } while ( 0); |
129 | for (n = rpm->debug.count; n--; ) { |
130 | if (rpm->debug.owners[n] == stack) { |
131 | memmove(rpm->debug.owners + n,__builtin_memmove((rpm->debug.owners + n), (rpm->debug. owners + n + 1), ((--rpm->debug.count - n) * sizeof(stack) )) |
132 | rpm->debug.owners + n + 1,__builtin_memmove((rpm->debug.owners + n), (rpm->debug. owners + n + 1), ((--rpm->debug.count - n) * sizeof(stack) )) |
133 | (--rpm->debug.count - n) * sizeof(stack))__builtin_memmove((rpm->debug.owners + n), (rpm->debug. owners + n + 1), ((--rpm->debug.count - n) * sizeof(stack) )); |
134 | found = true1; |
135 | break; |
136 | } |
137 | } |
138 | spin_unlock_irqrestore(&rpm->debug.lock, flags)do { (void)(flags); mtx_leave(&rpm->debug.lock); } while (0); |
139 | |
140 | if (drm_WARN(&i915->drm, !found,({ int __ret = !!(!found); if (__ret) printf("%s %s: " "Unmatched wakeref (tracking %lu), count %u\n" , dev_driver_string((&i915->drm)->dev), "", rpm-> debug.count, ({ typeof(*(&rpm->wakeref_count)) __tmp = *(volatile typeof(*(&rpm->wakeref_count)) *)&(*(& rpm->wakeref_count)); membar_datadep_consumer(); __tmp; }) ); __builtin_expect(!!(__ret), 0); }) |
141 | "Unmatched wakeref (tracking %lu), count %u\n",({ int __ret = !!(!found); if (__ret) printf("%s %s: " "Unmatched wakeref (tracking %lu), count %u\n" , dev_driver_string((&i915->drm)->dev), "", rpm-> debug.count, ({ typeof(*(&rpm->wakeref_count)) __tmp = *(volatile typeof(*(&rpm->wakeref_count)) *)&(*(& rpm->wakeref_count)); membar_datadep_consumer(); __tmp; }) ); __builtin_expect(!!(__ret), 0); }) |
142 | rpm->debug.count, atomic_read(&rpm->wakeref_count))({ int __ret = !!(!found); if (__ret) printf("%s %s: " "Unmatched wakeref (tracking %lu), count %u\n" , dev_driver_string((&i915->drm)->dev), "", rpm-> debug.count, ({ typeof(*(&rpm->wakeref_count)) __tmp = *(volatile typeof(*(&rpm->wakeref_count)) *)&(*(& rpm->wakeref_count)); membar_datadep_consumer(); __tmp; }) ); __builtin_expect(!!(__ret), 0); })) { |
143 | char *buf; |
144 | |
145 | buf = kmalloc(PAGE_SIZE(1 << 12), GFP_NOWAIT0x0002 | __GFP_NOWARN0); |
146 | if (!buf) |
147 | return; |
148 | |
149 | __print_depot_stack(stack, buf, PAGE_SIZE(1 << 12), 2); |
150 | DRM_DEBUG_DRIVER("wakeref %x from\n%s", stack, buf)__drm_dbg(DRM_UT_DRIVER, "wakeref %x from\n%s", stack, buf); |
151 | |
152 | stack = READ_ONCE(rpm->debug.last_release)({ typeof(rpm->debug.last_release) __tmp = *(volatile typeof (rpm->debug.last_release) *)&(rpm->debug.last_release ); membar_datadep_consumer(); __tmp; }); |
153 | if (stack) { |
154 | __print_depot_stack(stack, buf, PAGE_SIZE(1 << 12), 2); |
155 | DRM_DEBUG_DRIVER("wakeref last released at\n%s", buf)__drm_dbg(DRM_UT_DRIVER, "wakeref last released at\n%s", buf); |
156 | } |
157 | |
158 | kfree(buf); |
159 | } |
160 | } |
161 | |
162 | static int cmphandle(const void *_a, const void *_b) |
163 | { |
164 | const depot_stack_handle_t * const a = _a, * const b = _b; |
165 | |
166 | if (*a < *b) |
167 | return -1; |
168 | else if (*a > *b) |
169 | return 1; |
170 | else |
171 | return 0; |
172 | } |
173 | |
174 | static void |
175 | __print_intel_runtime_pm_wakeref(struct drm_printer *p, |
176 | const struct intel_runtime_pm_debug *dbg) |
177 | { |
178 | unsigned long i; |
179 | char *buf; |
180 | |
181 | buf = kmalloc(PAGE_SIZE(1 << 12), GFP_NOWAIT0x0002 | __GFP_NOWARN0); |
182 | if (!buf) |
183 | return; |
184 | |
185 | if (dbg->last_acquire) { |
186 | __print_depot_stack(dbg->last_acquire, buf, PAGE_SIZE(1 << 12), 2); |
187 | drm_printf(p, "Wakeref last acquired:\n%s", buf); |
188 | } |
189 | |
190 | if (dbg->last_release) { |
191 | __print_depot_stack(dbg->last_release, buf, PAGE_SIZE(1 << 12), 2); |
192 | drm_printf(p, "Wakeref last released:\n%s", buf); |
193 | } |
194 | |
195 | drm_printf(p, "Wakeref count: %lu\n", dbg->count); |
196 | |
197 | sort(dbg->owners, dbg->count, sizeof(*dbg->owners), cmphandle, NULL((void *)0)); |
198 | |
199 | for (i = 0; i < dbg->count; i++) { |
200 | depot_stack_handle_t stack = dbg->owners[i]; |
201 | unsigned long rep; |
202 | |
203 | rep = 1; |
204 | while (i + 1 < dbg->count && dbg->owners[i + 1] == stack) |
205 | rep++, i++; |
206 | __print_depot_stack(stack, buf, PAGE_SIZE(1 << 12), 2); |
207 | drm_printf(p, "Wakeref x%lu taken at:\n%s", rep, buf); |
208 | } |
209 | |
210 | kfree(buf); |
211 | } |
212 | |
213 | static noinline__attribute__((__noinline__)) void |
214 | __untrack_all_wakerefs(struct intel_runtime_pm_debug *debug, |
215 | struct intel_runtime_pm_debug *saved) |
216 | { |
217 | *saved = *debug; |
218 | |
219 | debug->owners = NULL((void *)0); |
220 | debug->count = 0; |
221 | debug->last_release = __save_depot_stack(); |
222 | } |
223 | |
224 | static void |
225 | dump_and_free_wakeref_tracking(struct intel_runtime_pm_debug *debug) |
226 | { |
227 | if (debug->count) { |
228 | struct drm_printer p = drm_debug_printer("i915"); |
229 | |
230 | __print_intel_runtime_pm_wakeref(&p, debug); |
231 | } |
232 | |
233 | kfree(debug->owners); |
234 | } |
235 | |
236 | static noinline__attribute__((__noinline__)) void |
237 | __intel_wakeref_dec_and_check_tracking(struct intel_runtime_pm *rpm) |
238 | { |
239 | struct intel_runtime_pm_debug dbg = {}; |
240 | unsigned long flags; |
241 | |
242 | if (!atomic_dec_and_lock_irqsave(&rpm->wakeref_count,atomic_dec_and_lock(&rpm->wakeref_count, &rpm-> debug.lock) |
243 | &rpm->debug.lock,atomic_dec_and_lock(&rpm->wakeref_count, &rpm-> debug.lock) |
244 | flags)atomic_dec_and_lock(&rpm->wakeref_count, &rpm-> debug.lock)) |
245 | return; |
246 | |
247 | __untrack_all_wakerefs(&rpm->debug, &dbg); |
248 | spin_unlock_irqrestore(&rpm->debug.lock, flags)do { (void)(flags); mtx_leave(&rpm->debug.lock); } while (0); |
249 | |
250 | dump_and_free_wakeref_tracking(&dbg); |
251 | } |
252 | |
253 | static noinline__attribute__((__noinline__)) void |
254 | untrack_all_intel_runtime_pm_wakerefs(struct intel_runtime_pm *rpm) |
255 | { |
256 | struct intel_runtime_pm_debug dbg = {}; |
257 | unsigned long flags; |
258 | |
259 | spin_lock_irqsave(&rpm->debug.lock, flags)do { flags = 0; mtx_enter(&rpm->debug.lock); } while ( 0); |
260 | __untrack_all_wakerefs(&rpm->debug, &dbg); |
261 | spin_unlock_irqrestore(&rpm->debug.lock, flags)do { (void)(flags); mtx_leave(&rpm->debug.lock); } while (0); |
262 | |
263 | dump_and_free_wakeref_tracking(&dbg); |
264 | } |
265 | |
266 | void print_intel_runtime_pm_wakeref(struct intel_runtime_pm *rpm, |
267 | struct drm_printer *p) |
268 | { |
269 | struct intel_runtime_pm_debug dbg = {}; |
270 | |
271 | do { |
272 | unsigned long alloc = dbg.count; |
273 | depot_stack_handle_t *s; |
274 | |
275 | spin_lock_irq(&rpm->debug.lock)mtx_enter(&rpm->debug.lock); |
276 | dbg.count = rpm->debug.count; |
277 | if (dbg.count <= alloc) { |
278 | memcpy(dbg.owners,__builtin_memcpy((dbg.owners), (rpm->debug.owners), (dbg.count * sizeof(*s))) |
279 | rpm->debug.owners,__builtin_memcpy((dbg.owners), (rpm->debug.owners), (dbg.count * sizeof(*s))) |
280 | dbg.count * sizeof(*s))__builtin_memcpy((dbg.owners), (rpm->debug.owners), (dbg.count * sizeof(*s))); |
281 | } |
282 | dbg.last_acquire = rpm->debug.last_acquire; |
283 | dbg.last_release = rpm->debug.last_release; |
284 | spin_unlock_irq(&rpm->debug.lock)mtx_leave(&rpm->debug.lock); |
285 | if (dbg.count <= alloc) |
286 | break; |
287 | |
288 | s = krealloc(dbg.owners, |
289 | dbg.count * sizeof(*s), |
290 | GFP_NOWAIT0x0002 | __GFP_NOWARN0); |
291 | if (!s) |
292 | goto out; |
293 | |
294 | dbg.owners = s; |
295 | } while (1); |
296 | |
297 | __print_intel_runtime_pm_wakeref(p, &dbg); |
298 | |
299 | out: |
300 | kfree(dbg.owners); |
301 | } |
302 | |
303 | #else |
304 | |
305 | static void init_intel_runtime_pm_wakeref(struct intel_runtime_pm *rpm) |
306 | { |
307 | } |
308 | |
309 | static depot_stack_handle_t |
310 | track_intel_runtime_pm_wakeref(struct intel_runtime_pm *rpm) |
311 | { |
312 | return -1; |
313 | } |
314 | |
315 | static void untrack_intel_runtime_pm_wakeref(struct intel_runtime_pm *rpm, |
316 | intel_wakeref_t wref) |
317 | { |
318 | } |
319 | |
320 | static void |
321 | __intel_wakeref_dec_and_check_tracking(struct intel_runtime_pm *rpm) |
322 | { |
323 | atomic_dec(&rpm->wakeref_count)__sync_fetch_and_sub(&rpm->wakeref_count, 1); |
324 | } |
325 | |
326 | static void |
327 | untrack_all_intel_runtime_pm_wakerefs(struct intel_runtime_pm *rpm) |
328 | { |
329 | } |
330 | |
331 | #endif |
332 | |
333 | static void |
334 | intel_runtime_pm_acquire(struct intel_runtime_pm *rpm, bool_Bool wakelock) |
335 | { |
336 | if (wakelock) { |
337 | atomic_add(1 + INTEL_RPM_WAKELOCK_BIAS, &rpm->wakeref_count)__sync_fetch_and_add(&rpm->wakeref_count, 1 + (1 << ((8 * sizeof((((struct intel_runtime_pm *)0)->wakeref_count ))) / 2))); |
338 | assert_rpm_wakelock_held(rpm); |
339 | } else { |
340 | atomic_inc(&rpm->wakeref_count)__sync_fetch_and_add(&rpm->wakeref_count, 1); |
341 | assert_rpm_raw_wakeref_held(rpm); |
342 | } |
343 | } |
344 | |
345 | static void |
346 | intel_runtime_pm_release(struct intel_runtime_pm *rpm, int wakelock) |
347 | { |
348 | if (wakelock) { |
349 | assert_rpm_wakelock_held(rpm); |
350 | atomic_sub(INTEL_RPM_WAKELOCK_BIAS, &rpm->wakeref_count)__sync_fetch_and_sub(&rpm->wakeref_count, (1 << ( (8 * sizeof((((struct intel_runtime_pm *)0)->wakeref_count ))) / 2))); |
351 | } else { |
352 | assert_rpm_raw_wakeref_held(rpm); |
353 | } |
354 | |
355 | __intel_wakeref_dec_and_check_tracking(rpm); |
356 | } |
357 | |
358 | static intel_wakeref_t __intel_runtime_pm_get(struct intel_runtime_pm *rpm, |
359 | bool_Bool wakelock) |
360 | { |
361 | struct drm_i915_privateinteldrm_softc *i915 = container_of(rpm,({ const __typeof( ((struct inteldrm_softc *)0)->runtime_pm ) *__mptr = (rpm); (struct inteldrm_softc *)( (char *)__mptr - __builtin_offsetof(struct inteldrm_softc, runtime_pm) );}) |
362 | struct drm_i915_private,({ const __typeof( ((struct inteldrm_softc *)0)->runtime_pm ) *__mptr = (rpm); (struct inteldrm_softc *)( (char *)__mptr - __builtin_offsetof(struct inteldrm_softc, runtime_pm) );}) |
363 | runtime_pm)({ const __typeof( ((struct inteldrm_softc *)0)->runtime_pm ) *__mptr = (rpm); (struct inteldrm_softc *)( (char *)__mptr - __builtin_offsetof(struct inteldrm_softc, runtime_pm) );}); |
364 | int ret; |
365 | |
366 | ret = pm_runtime_get_sync(rpm->kdev); |
367 | drm_WARN_ONCE(&i915->drm, ret < 0,({ static int __warned; int __ret = !!(ret < 0); if (__ret && !__warned) { printf("%s %s: " "pm_runtime_get_sync() failed: %d\n" , dev_driver_string((&i915->drm)->dev), "", ret); __warned = 1; } __builtin_expect(!!(__ret), 0); }) |
368 | "pm_runtime_get_sync() failed: %d\n", ret)({ static int __warned; int __ret = !!(ret < 0); if (__ret && !__warned) { printf("%s %s: " "pm_runtime_get_sync() failed: %d\n" , dev_driver_string((&i915->drm)->dev), "", ret); __warned = 1; } __builtin_expect(!!(__ret), 0); }); |
369 | |
370 | intel_runtime_pm_acquire(rpm, wakelock); |
371 | |
372 | return track_intel_runtime_pm_wakeref(rpm); |
373 | } |
374 | |
375 | /** |
376 | * intel_runtime_pm_get_raw - grab a raw runtime pm reference |
377 | * @rpm: the intel_runtime_pm structure |
378 | * |
379 | * This is the unlocked version of intel_display_power_is_enabled() and should |
380 | * only be used from error capture and recovery code where deadlocks are |
381 | * possible. |
382 | * This function grabs a device-level runtime pm reference (mostly used for |
383 | * asynchronous PM management from display code) and ensures that it is powered |
384 | * up. Raw references are not considered during wakelock assert checks. |
385 | * |
386 | * Any runtime pm reference obtained by this function must have a symmetric |
387 | * call to intel_runtime_pm_put_raw() to release the reference again. |
388 | * |
389 | * Returns: the wakeref cookie to pass to intel_runtime_pm_put_raw(), evaluates |
390 | * as True if the wakeref was acquired, or False otherwise. |
391 | */ |
392 | intel_wakeref_t intel_runtime_pm_get_raw(struct intel_runtime_pm *rpm) |
393 | { |
394 | return __intel_runtime_pm_get(rpm, false0); |
395 | } |
396 | |
397 | /** |
398 | * intel_runtime_pm_get - grab a runtime pm reference |
399 | * @rpm: the intel_runtime_pm structure |
400 | * |
401 | * This function grabs a device-level runtime pm reference (mostly used for GEM |
402 | * code to ensure the GTT or GT is on) and ensures that it is powered up. |
403 | * |
404 | * Any runtime pm reference obtained by this function must have a symmetric |
405 | * call to intel_runtime_pm_put() to release the reference again. |
406 | * |
407 | * Returns: the wakeref cookie to pass to intel_runtime_pm_put() |
408 | */ |
409 | intel_wakeref_t intel_runtime_pm_get(struct intel_runtime_pm *rpm) |
410 | { |
411 | return __intel_runtime_pm_get(rpm, true1); |
412 | } |
413 | |
414 | /** |
415 | * __intel_runtime_pm_get_if_active - grab a runtime pm reference if device is active |
416 | * @rpm: the intel_runtime_pm structure |
417 | * @ignore_usecount: get a ref even if dev->power.usage_count is 0 |
418 | * |
419 | * This function grabs a device-level runtime pm reference if the device is |
420 | * already active and ensures that it is powered up. It is illegal to try |
421 | * and access the HW should intel_runtime_pm_get_if_active() report failure. |
422 | * |
423 | * If @ignore_usecount=true, a reference will be acquired even if there is no |
424 | * user requiring the device to be powered up (dev->power.usage_count == 0). |
425 | * If the function returns false in this case then it's guaranteed that the |
426 | * device's runtime suspend hook has been called already or that it will be |
427 | * called (and hence it's also guaranteed that the device's runtime resume |
428 | * hook will be called eventually). |
429 | * |
430 | * Any runtime pm reference obtained by this function must have a symmetric |
431 | * call to intel_runtime_pm_put() to release the reference again. |
432 | * |
433 | * Returns: the wakeref cookie to pass to intel_runtime_pm_put(), evaluates |
434 | * as True if the wakeref was acquired, or False otherwise. |
435 | */ |
436 | static intel_wakeref_t __intel_runtime_pm_get_if_active(struct intel_runtime_pm *rpm, |
437 | bool_Bool ignore_usecount) |
438 | { |
439 | if (IS_ENABLED(CONFIG_PM)0) { |
440 | /* |
441 | * In cases runtime PM is disabled by the RPM core and we get |
442 | * an -EINVAL return value we are not supposed to call this |
443 | * function, since the power state is undefined. This applies |
444 | * atm to the late/early system suspend/resume handlers. |
445 | */ |
446 | if (pm_runtime_get_if_active(rpm->kdev, ignore_usecount) <= 0) |
447 | return 0; |
448 | } |
449 | |
450 | intel_runtime_pm_acquire(rpm, true1); |
451 | |
452 | return track_intel_runtime_pm_wakeref(rpm); |
453 | } |
454 | |
455 | intel_wakeref_t intel_runtime_pm_get_if_in_use(struct intel_runtime_pm *rpm) |
456 | { |
457 | return __intel_runtime_pm_get_if_active(rpm, false0); |
458 | } |
459 | |
460 | intel_wakeref_t intel_runtime_pm_get_if_active(struct intel_runtime_pm *rpm) |
461 | { |
462 | return __intel_runtime_pm_get_if_active(rpm, true1); |
463 | } |
464 | |
465 | /** |
466 | * intel_runtime_pm_get_noresume - grab a runtime pm reference |
467 | * @rpm: the intel_runtime_pm structure |
468 | * |
469 | * This function grabs a device-level runtime pm reference (mostly used for GEM |
470 | * code to ensure the GTT or GT is on). |
471 | * |
472 | * It will _not_ power up the device but instead only check that it's powered |
473 | * on. Therefore it is only valid to call this functions from contexts where |
474 | * the device is known to be powered up and where trying to power it up would |
475 | * result in hilarity and deadlocks. That pretty much means only the system |
476 | * suspend/resume code where this is used to grab runtime pm references for |
477 | * delayed setup down in work items. |
478 | * |
479 | * Any runtime pm reference obtained by this function must have a symmetric |
480 | * call to intel_runtime_pm_put() to release the reference again. |
481 | * |
482 | * Returns: the wakeref cookie to pass to intel_runtime_pm_put() |
483 | */ |
484 | intel_wakeref_t intel_runtime_pm_get_noresume(struct intel_runtime_pm *rpm) |
485 | { |
486 | assert_rpm_wakelock_held(rpm); |
487 | pm_runtime_get_noresume(rpm->kdev); |
488 | |
489 | intel_runtime_pm_acquire(rpm, true1); |
490 | |
491 | return track_intel_runtime_pm_wakeref(rpm); |
492 | } |
493 | |
494 | static void __intel_runtime_pm_put(struct intel_runtime_pm *rpm, |
495 | intel_wakeref_t wref, |
496 | bool_Bool wakelock) |
497 | { |
498 | struct device *kdev = rpm->kdev; |
Value stored to 'kdev' during its initialization is never read | |
499 | |
500 | untrack_intel_runtime_pm_wakeref(rpm, wref); |
501 | |
502 | intel_runtime_pm_release(rpm, wakelock); |
503 | |
504 | pm_runtime_mark_last_busy(kdev); |
505 | pm_runtime_put_autosuspend(kdev); |
506 | } |
507 | |
508 | /** |
509 | * intel_runtime_pm_put_raw - release a raw runtime pm reference |
510 | * @rpm: the intel_runtime_pm structure |
511 | * @wref: wakeref acquired for the reference that is being released |
512 | * |
513 | * This function drops the device-level runtime pm reference obtained by |
514 | * intel_runtime_pm_get_raw() and might power down the corresponding |
515 | * hardware block right away if this is the last reference. |
516 | */ |
517 | void |
518 | intel_runtime_pm_put_raw(struct intel_runtime_pm *rpm, intel_wakeref_t wref) |
519 | { |
520 | __intel_runtime_pm_put(rpm, wref, false0); |
521 | } |
522 | |
523 | /** |
524 | * intel_runtime_pm_put_unchecked - release an unchecked runtime pm reference |
525 | * @rpm: the intel_runtime_pm structure |
526 | * |
527 | * This function drops the device-level runtime pm reference obtained by |
528 | * intel_runtime_pm_get() and might power down the corresponding |
529 | * hardware block right away if this is the last reference. |
530 | * |
531 | * This function exists only for historical reasons and should be avoided in |
532 | * new code, as the correctness of its use cannot be checked. Always use |
533 | * intel_runtime_pm_put() instead. |
534 | */ |
535 | void intel_runtime_pm_put_unchecked(struct intel_runtime_pm *rpm) |
536 | { |
537 | __intel_runtime_pm_put(rpm, -1, true1); |
538 | } |
539 | |
540 | #if IS_ENABLED(CONFIG_DRM_I915_DEBUG_RUNTIME_PM)0 |
541 | /** |
542 | * intel_runtime_pm_put - release a runtime pm reference |
543 | * @rpm: the intel_runtime_pm structure |
544 | * @wref: wakeref acquired for the reference that is being released |
545 | * |
546 | * This function drops the device-level runtime pm reference obtained by |
547 | * intel_runtime_pm_get() and might power down the corresponding |
548 | * hardware block right away if this is the last reference. |
549 | */ |
550 | void intel_runtime_pm_put(struct intel_runtime_pm *rpm, intel_wakeref_t wref) |
551 | { |
552 | __intel_runtime_pm_put(rpm, wref, true1); |
553 | } |
554 | #endif |
555 | |
556 | /** |
557 | * intel_runtime_pm_enable - enable runtime pm |
558 | * @rpm: the intel_runtime_pm structure |
559 | * |
560 | * This function enables runtime pm at the end of the driver load sequence. |
561 | * |
562 | * Note that this function does currently not enable runtime pm for the |
563 | * subordinate display power domains. That is done by |
564 | * intel_power_domains_enable(). |
565 | */ |
566 | void intel_runtime_pm_enable(struct intel_runtime_pm *rpm) |
567 | { |
568 | struct drm_i915_privateinteldrm_softc *i915 = container_of(rpm,({ const __typeof( ((struct inteldrm_softc *)0)->runtime_pm ) *__mptr = (rpm); (struct inteldrm_softc *)( (char *)__mptr - __builtin_offsetof(struct inteldrm_softc, runtime_pm) );}) |
569 | struct drm_i915_private,({ const __typeof( ((struct inteldrm_softc *)0)->runtime_pm ) *__mptr = (rpm); (struct inteldrm_softc *)( (char *)__mptr - __builtin_offsetof(struct inteldrm_softc, runtime_pm) );}) |
570 | runtime_pm)({ const __typeof( ((struct inteldrm_softc *)0)->runtime_pm ) *__mptr = (rpm); (struct inteldrm_softc *)( (char *)__mptr - __builtin_offsetof(struct inteldrm_softc, runtime_pm) );}); |
571 | struct device *kdev = rpm->kdev; |
572 | |
573 | /* |
574 | * Disable the system suspend direct complete optimization, which can |
575 | * leave the device suspended skipping the driver's suspend handlers |
576 | * if the device was already runtime suspended. This is needed due to |
577 | * the difference in our runtime and system suspend sequence and |
578 | * becaue the HDA driver may require us to enable the audio power |
579 | * domain during system suspend. |
580 | */ |
581 | dev_pm_set_driver_flags(kdev, DPM_FLAG_NO_DIRECT_COMPLETE); |
582 | |
583 | pm_runtime_set_autosuspend_delay(kdev, 10000); /* 10s */ |
584 | pm_runtime_mark_last_busy(kdev); |
585 | |
586 | /* |
587 | * Take a permanent reference to disable the RPM functionality and drop |
588 | * it only when unloading the driver. Use the low level get/put helpers, |
589 | * so the driver's own RPM reference tracking asserts also work on |
590 | * platforms without RPM support. |
591 | */ |
592 | if (!rpm->available) { |
593 | int ret; |
594 | |
595 | pm_runtime_dont_use_autosuspend(kdev); |
596 | ret = pm_runtime_get_sync(kdev); |
597 | drm_WARN(&i915->drm, ret < 0,({ int __ret = !!(ret < 0); if (__ret) printf("%s %s: " "pm_runtime_get_sync() failed: %d\n" , dev_driver_string((&i915->drm)->dev), "", ret); __builtin_expect (!!(__ret), 0); }) |
598 | "pm_runtime_get_sync() failed: %d\n", ret)({ int __ret = !!(ret < 0); if (__ret) printf("%s %s: " "pm_runtime_get_sync() failed: %d\n" , dev_driver_string((&i915->drm)->dev), "", ret); __builtin_expect (!!(__ret), 0); }); |
599 | } else { |
600 | pm_runtime_use_autosuspend(kdev); |
601 | } |
602 | |
603 | /* |
604 | * The core calls the driver load handler with an RPM reference held. |
605 | * We drop that here and will reacquire it during unloading in |
606 | * intel_power_domains_fini(). |
607 | */ |
608 | pm_runtime_put_autosuspend(kdev); |
609 | } |
610 | |
611 | void intel_runtime_pm_disable(struct intel_runtime_pm *rpm) |
612 | { |
613 | struct drm_i915_privateinteldrm_softc *i915 = container_of(rpm,({ const __typeof( ((struct inteldrm_softc *)0)->runtime_pm ) *__mptr = (rpm); (struct inteldrm_softc *)( (char *)__mptr - __builtin_offsetof(struct inteldrm_softc, runtime_pm) );}) |
614 | struct drm_i915_private,({ const __typeof( ((struct inteldrm_softc *)0)->runtime_pm ) *__mptr = (rpm); (struct inteldrm_softc *)( (char *)__mptr - __builtin_offsetof(struct inteldrm_softc, runtime_pm) );}) |
615 | runtime_pm)({ const __typeof( ((struct inteldrm_softc *)0)->runtime_pm ) *__mptr = (rpm); (struct inteldrm_softc *)( (char *)__mptr - __builtin_offsetof(struct inteldrm_softc, runtime_pm) );}); |
616 | struct device *kdev = rpm->kdev; |
617 | |
618 | /* Transfer rpm ownership back to core */ |
619 | drm_WARN(&i915->drm, pm_runtime_get_sync(kdev) < 0,({ int __ret = !!(pm_runtime_get_sync(kdev) < 0); if (__ret ) printf("%s %s: " "Failed to pass rpm ownership back to core\n" , dev_driver_string((&i915->drm)->dev), ""); __builtin_expect (!!(__ret), 0); }) |
620 | "Failed to pass rpm ownership back to core\n")({ int __ret = !!(pm_runtime_get_sync(kdev) < 0); if (__ret ) printf("%s %s: " "Failed to pass rpm ownership back to core\n" , dev_driver_string((&i915->drm)->dev), ""); __builtin_expect (!!(__ret), 0); }); |
621 | |
622 | pm_runtime_dont_use_autosuspend(kdev); |
623 | |
624 | if (!rpm->available) |
625 | pm_runtime_put(kdev); |
626 | } |
627 | |
628 | void intel_runtime_pm_driver_release(struct intel_runtime_pm *rpm) |
629 | { |
630 | struct drm_i915_privateinteldrm_softc *i915 = container_of(rpm,({ const __typeof( ((struct inteldrm_softc *)0)->runtime_pm ) *__mptr = (rpm); (struct inteldrm_softc *)( (char *)__mptr - __builtin_offsetof(struct inteldrm_softc, runtime_pm) );}) |
631 | struct drm_i915_private,({ const __typeof( ((struct inteldrm_softc *)0)->runtime_pm ) *__mptr = (rpm); (struct inteldrm_softc *)( (char *)__mptr - __builtin_offsetof(struct inteldrm_softc, runtime_pm) );}) |
632 | runtime_pm)({ const __typeof( ((struct inteldrm_softc *)0)->runtime_pm ) *__mptr = (rpm); (struct inteldrm_softc *)( (char *)__mptr - __builtin_offsetof(struct inteldrm_softc, runtime_pm) );}); |
633 | int count = atomic_read(&rpm->wakeref_count)({ typeof(*(&rpm->wakeref_count)) __tmp = *(volatile typeof (*(&rpm->wakeref_count)) *)&(*(&rpm->wakeref_count )); membar_datadep_consumer(); __tmp; }); |
634 | |
635 | drm_WARN(&i915->drm, count,({ int __ret = !!(count); if (__ret) printf("%s %s: " "i915 raw-wakerefs=%d wakelocks=%d on cleanup\n" , dev_driver_string((&i915->drm)->dev), "", intel_rpm_raw_wakeref_count (count), intel_rpm_wakelock_count(count)); __builtin_expect(! !(__ret), 0); }) |
636 | "i915 raw-wakerefs=%d wakelocks=%d on cleanup\n",({ int __ret = !!(count); if (__ret) printf("%s %s: " "i915 raw-wakerefs=%d wakelocks=%d on cleanup\n" , dev_driver_string((&i915->drm)->dev), "", intel_rpm_raw_wakeref_count (count), intel_rpm_wakelock_count(count)); __builtin_expect(! !(__ret), 0); }) |
637 | intel_rpm_raw_wakeref_count(count),({ int __ret = !!(count); if (__ret) printf("%s %s: " "i915 raw-wakerefs=%d wakelocks=%d on cleanup\n" , dev_driver_string((&i915->drm)->dev), "", intel_rpm_raw_wakeref_count (count), intel_rpm_wakelock_count(count)); __builtin_expect(! !(__ret), 0); }) |
638 | intel_rpm_wakelock_count(count))({ int __ret = !!(count); if (__ret) printf("%s %s: " "i915 raw-wakerefs=%d wakelocks=%d on cleanup\n" , dev_driver_string((&i915->drm)->dev), "", intel_rpm_raw_wakeref_count (count), intel_rpm_wakelock_count(count)); __builtin_expect(! !(__ret), 0); }); |
639 | |
640 | untrack_all_intel_runtime_pm_wakerefs(rpm); |
641 | } |
642 | |
643 | void intel_runtime_pm_init_early(struct intel_runtime_pm *rpm) |
644 | { |
645 | struct drm_i915_privateinteldrm_softc *i915 = |
646 | container_of(rpm, struct drm_i915_private, runtime_pm)({ const __typeof( ((struct inteldrm_softc *)0)->runtime_pm ) *__mptr = (rpm); (struct inteldrm_softc *)( (char *)__mptr - __builtin_offsetof(struct inteldrm_softc, runtime_pm) );}); |
647 | #ifdef notyet |
648 | struct pci_dev *pdev = i915->drm.pdev; |
649 | struct device *kdev = &pdev->dev; |
650 | |
651 | rpm->kdev = kdev; |
652 | #endif |
653 | rpm->available = HAS_RUNTIME_PM(i915)((&(i915)->__info)->has_runtime_pm); |
654 | |
655 | init_intel_runtime_pm_wakeref(rpm); |
656 | } |