Commit | Line | Data |
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3ed4351a DV |
1 | /* |
2 | * drm_irq.c IRQ and vblank support | |
3 | * | |
4 | * \author Rickard E. (Rik) Faith <faith@valinux.com> | |
5 | * \author Gareth Hughes <gareth@valinux.com> | |
6 | * | |
7 | * Permission is hereby granted, free of charge, to any person obtaining a | |
8 | * copy of this software and associated documentation files (the "Software"), | |
9 | * to deal in the Software without restriction, including without limitation | |
10 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, | |
11 | * and/or sell copies of the Software, and to permit persons to whom the | |
12 | * Software is furnished to do so, subject to the following conditions: | |
13 | * | |
14 | * The above copyright notice and this permission notice (including the next | |
15 | * paragraph) shall be included in all copies or substantial portions of the | |
16 | * Software. | |
17 | * | |
18 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
19 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
20 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
21 | * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR | |
22 | * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, | |
23 | * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR | |
24 | * OTHER DEALINGS IN THE SOFTWARE. | |
25 | */ | |
26 | ||
3ed4351a | 27 | #include <linux/export.h> |
0500c04e SR |
28 | #include <linux/moduleparam.h> |
29 | ||
30 | #include <drm/drm_crtc.h> | |
31 | #include <drm/drm_drv.h> | |
32 | #include <drm/drm_framebuffer.h> | |
33 | #include <drm/drm_print.h> | |
34 | #include <drm/drm_os_linux.h> | |
35 | #include <drm/drm_vblank.h> | |
3ed4351a | 36 | |
3ed4351a | 37 | #include "drm_internal.h" |
0500c04e | 38 | #include "drm_trace.h" |
3ed4351a | 39 | |
57d30230 DV |
40 | /** |
41 | * DOC: vblank handling | |
42 | * | |
43 | * Vertical blanking plays a major role in graphics rendering. To achieve | |
44 | * tear-free display, users must synchronize page flips and/or rendering to | |
45 | * vertical blanking. The DRM API offers ioctls to perform page flips | |
46 | * synchronized to vertical blanking and wait for vertical blanking. | |
47 | * | |
48 | * The DRM core handles most of the vertical blanking management logic, which | |
49 | * involves filtering out spurious interrupts, keeping race-free blanking | |
50 | * counters, coping with counter wrap-around and resets and keeping use counts. | |
51 | * It relies on the driver to generate vertical blanking interrupts and | |
52 | * optionally provide a hardware vertical blanking counter. | |
53 | * | |
54 | * Drivers must initialize the vertical blanking handling core with a call to | |
55 | * drm_vblank_init(). Minimally, a driver needs to implement | |
56 | * &drm_crtc_funcs.enable_vblank and &drm_crtc_funcs.disable_vblank plus call | |
1e55a53a | 57 | * drm_crtc_handle_vblank() in its vblank interrupt handler for working vblank |
57d30230 DV |
58 | * support. |
59 | * | |
60 | * Vertical blanking interrupts can be enabled by the DRM core or by drivers | |
61 | * themselves (for instance to handle page flipping operations). The DRM core | |
62 | * maintains a vertical blanking use count to ensure that the interrupts are not | |
63 | * disabled while a user still needs them. To increment the use count, drivers | |
64 | * call drm_crtc_vblank_get() and release the vblank reference again with | |
65 | * drm_crtc_vblank_put(). In between these two calls vblank interrupts are | |
66 | * guaranteed to be enabled. | |
67 | * | |
68 | * On many hardware disabling the vblank interrupt cannot be done in a race-free | |
69 | * manner, see &drm_driver.vblank_disable_immediate and | |
70 | * &drm_driver.max_vblank_count. In that case the vblank core only disables the | |
71 | * vblanks after a timer has expired, which can be configured through the | |
72 | * ``vblankoffdelay`` module parameter. | |
73 | */ | |
74 | ||
3ed4351a DV |
75 | /* Retry timestamp calculation up to 3 times to satisfy |
76 | * drm_timestamp_precision before giving up. | |
77 | */ | |
78 | #define DRM_TIMESTAMP_MAXRETRIES 3 | |
79 | ||
80 | /* Threshold in nanoseconds for detection of redundant | |
81 | * vblank irq in drm_handle_vblank(). 1 msec should be ok. | |
82 | */ | |
83 | #define DRM_REDUNDANT_VBLIRQ_THRESH_NS 1000000 | |
84 | ||
85 | static bool | |
86 | drm_get_last_vbltimestamp(struct drm_device *dev, unsigned int pipe, | |
67680d3c | 87 | ktime_t *tvblank, bool in_vblank_irq); |
3ed4351a DV |
88 | |
89 | static unsigned int drm_timestamp_precision = 20; /* Default to 20 usecs. */ | |
90 | ||
3ed4351a DV |
91 | static int drm_vblank_offdelay = 5000; /* Default to 5000 msecs. */ |
92 | ||
93 | module_param_named(vblankoffdelay, drm_vblank_offdelay, int, 0600); | |
94 | module_param_named(timestamp_precision_usec, drm_timestamp_precision, int, 0600); | |
3ed4351a DV |
95 | MODULE_PARM_DESC(vblankoffdelay, "Delay until vblank irq auto-disable [msecs] (0: never disable, <0: disable immediately)"); |
96 | MODULE_PARM_DESC(timestamp_precision_usec, "Max. error on timestamps [usecs]"); | |
3ed4351a DV |
97 | |
98 | static void store_vblank(struct drm_device *dev, unsigned int pipe, | |
99 | u32 vblank_count_inc, | |
67680d3c | 100 | ktime_t t_vblank, u32 last) |
3ed4351a DV |
101 | { |
102 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
103 | ||
104 | assert_spin_locked(&dev->vblank_time_lock); | |
105 | ||
106 | vblank->last = last; | |
107 | ||
108 | write_seqlock(&vblank->seqlock); | |
67680d3c | 109 | vblank->time = t_vblank; |
3ed4351a DV |
110 | vblank->count += vblank_count_inc; |
111 | write_sequnlock(&vblank->seqlock); | |
112 | } | |
113 | ||
ed20151a VS |
114 | static u32 drm_max_vblank_count(struct drm_device *dev, unsigned int pipe) |
115 | { | |
116 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
117 | ||
118 | return vblank->max_vblank_count ?: dev->max_vblank_count; | |
119 | } | |
120 | ||
3ed4351a DV |
121 | /* |
122 | * "No hw counter" fallback implementation of .get_vblank_counter() hook, | |
123 | * if there is no useable hardware frame counter available. | |
124 | */ | |
125 | static u32 drm_vblank_no_hw_counter(struct drm_device *dev, unsigned int pipe) | |
126 | { | |
ed20151a | 127 | WARN_ON_ONCE(drm_max_vblank_count(dev, pipe) != 0); |
3ed4351a DV |
128 | return 0; |
129 | } | |
130 | ||
131 | static u32 __get_vblank_counter(struct drm_device *dev, unsigned int pipe) | |
132 | { | |
133 | if (drm_core_check_feature(dev, DRIVER_MODESET)) { | |
134 | struct drm_crtc *crtc = drm_crtc_from_index(dev, pipe); | |
135 | ||
4ffb8dee JM |
136 | if (WARN_ON(!crtc)) |
137 | return 0; | |
138 | ||
3ed4351a DV |
139 | if (crtc->funcs->get_vblank_counter) |
140 | return crtc->funcs->get_vblank_counter(crtc); | |
141 | } | |
142 | ||
143 | if (dev->driver->get_vblank_counter) | |
144 | return dev->driver->get_vblank_counter(dev, pipe); | |
145 | ||
146 | return drm_vblank_no_hw_counter(dev, pipe); | |
147 | } | |
148 | ||
149 | /* | |
150 | * Reset the stored timestamp for the current vblank count to correspond | |
151 | * to the last vblank occurred. | |
152 | * | |
153 | * Only to be called from drm_crtc_vblank_on(). | |
154 | * | |
155 | * Note: caller must hold &drm_device.vbl_lock since this reads & writes | |
156 | * device vblank fields. | |
157 | */ | |
158 | static void drm_reset_vblank_timestamp(struct drm_device *dev, unsigned int pipe) | |
159 | { | |
160 | u32 cur_vblank; | |
161 | bool rc; | |
67680d3c | 162 | ktime_t t_vblank; |
3ed4351a DV |
163 | int count = DRM_TIMESTAMP_MAXRETRIES; |
164 | ||
165 | spin_lock(&dev->vblank_time_lock); | |
166 | ||
167 | /* | |
168 | * sample the current counter to avoid random jumps | |
169 | * when drm_vblank_enable() applies the diff | |
170 | */ | |
171 | do { | |
172 | cur_vblank = __get_vblank_counter(dev, pipe); | |
173 | rc = drm_get_last_vbltimestamp(dev, pipe, &t_vblank, false); | |
174 | } while (cur_vblank != __get_vblank_counter(dev, pipe) && --count > 0); | |
175 | ||
176 | /* | |
177 | * Only reinitialize corresponding vblank timestamp if high-precision query | |
178 | * available and didn't fail. Otherwise reinitialize delayed at next vblank | |
179 | * interrupt and assign 0 for now, to mark the vblanktimestamp as invalid. | |
180 | */ | |
181 | if (!rc) | |
67680d3c | 182 | t_vblank = 0; |
3ed4351a DV |
183 | |
184 | /* | |
185 | * +1 to make sure user will never see the same | |
186 | * vblank counter value before and after a modeset | |
187 | */ | |
67680d3c | 188 | store_vblank(dev, pipe, 1, t_vblank, cur_vblank); |
3ed4351a DV |
189 | |
190 | spin_unlock(&dev->vblank_time_lock); | |
191 | } | |
192 | ||
193 | /* | |
194 | * Call back into the driver to update the appropriate vblank counter | |
195 | * (specified by @pipe). Deal with wraparound, if it occurred, and | |
196 | * update the last read value so we can deal with wraparound on the next | |
197 | * call if necessary. | |
198 | * | |
199 | * Only necessary when going from off->on, to account for frames we | |
200 | * didn't get an interrupt for. | |
201 | * | |
202 | * Note: caller must hold &drm_device.vbl_lock since this reads & writes | |
203 | * device vblank fields. | |
204 | */ | |
205 | static void drm_update_vblank_count(struct drm_device *dev, unsigned int pipe, | |
206 | bool in_vblank_irq) | |
207 | { | |
208 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
209 | u32 cur_vblank, diff; | |
210 | bool rc; | |
67680d3c | 211 | ktime_t t_vblank; |
3ed4351a DV |
212 | int count = DRM_TIMESTAMP_MAXRETRIES; |
213 | int framedur_ns = vblank->framedur_ns; | |
ed20151a | 214 | u32 max_vblank_count = drm_max_vblank_count(dev, pipe); |
3ed4351a DV |
215 | |
216 | /* | |
217 | * Interrupts were disabled prior to this call, so deal with counter | |
218 | * wrap if needed. | |
219 | * NOTE! It's possible we lost a full dev->max_vblank_count + 1 events | |
220 | * here if the register is small or we had vblank interrupts off for | |
221 | * a long time. | |
222 | * | |
223 | * We repeat the hardware vblank counter & timestamp query until | |
224 | * we get consistent results. This to prevent races between gpu | |
225 | * updating its hardware counter while we are retrieving the | |
226 | * corresponding vblank timestamp. | |
227 | */ | |
228 | do { | |
229 | cur_vblank = __get_vblank_counter(dev, pipe); | |
230 | rc = drm_get_last_vbltimestamp(dev, pipe, &t_vblank, in_vblank_irq); | |
231 | } while (cur_vblank != __get_vblank_counter(dev, pipe) && --count > 0); | |
232 | ||
ed20151a | 233 | if (max_vblank_count) { |
3ed4351a | 234 | /* trust the hw counter when it's around */ |
ed20151a | 235 | diff = (cur_vblank - vblank->last) & max_vblank_count; |
3ed4351a | 236 | } else if (rc && framedur_ns) { |
67680d3c | 237 | u64 diff_ns = ktime_to_ns(ktime_sub(t_vblank, vblank->time)); |
3ed4351a DV |
238 | |
239 | /* | |
240 | * Figure out how many vblanks we've missed based | |
241 | * on the difference in the timestamps and the | |
242 | * frame/field duration. | |
243 | */ | |
41ff5bd8 OV |
244 | |
245 | DRM_DEBUG_VBL("crtc %u: Calculating number of vblanks." | |
246 | " diff_ns = %lld, framedur_ns = %d)\n", | |
247 | pipe, (long long) diff_ns, framedur_ns); | |
248 | ||
3ed4351a DV |
249 | diff = DIV_ROUND_CLOSEST_ULL(diff_ns, framedur_ns); |
250 | ||
251 | if (diff == 0 && in_vblank_irq) | |
41ff5bd8 OV |
252 | DRM_DEBUG_VBL("crtc %u: Redundant vblirq ignored\n", |
253 | pipe); | |
3ed4351a DV |
254 | } else { |
255 | /* some kind of default for drivers w/o accurate vbl timestamping */ | |
256 | diff = in_vblank_irq ? 1 : 0; | |
257 | } | |
258 | ||
259 | /* | |
260 | * Within a drm_vblank_pre_modeset - drm_vblank_post_modeset | |
261 | * interval? If so then vblank irqs keep running and it will likely | |
262 | * happen that the hardware vblank counter is not trustworthy as it | |
263 | * might reset at some point in that interval and vblank timestamps | |
264 | * are not trustworthy either in that interval. Iow. this can result | |
265 | * in a bogus diff >> 1 which must be avoided as it would cause | |
266 | * random large forward jumps of the software vblank counter. | |
267 | */ | |
268 | if (diff > 1 && (vblank->inmodeset & 0x2)) { | |
269 | DRM_DEBUG_VBL("clamping vblank bump to 1 on crtc %u: diffr=%u" | |
270 | " due to pre-modeset.\n", pipe, diff); | |
271 | diff = 1; | |
272 | } | |
273 | ||
274 | DRM_DEBUG_VBL("updating vblank count on crtc %u:" | |
570e8696 | 275 | " current=%llu, diff=%u, hw=%u hw_last=%u\n", |
3ed4351a DV |
276 | pipe, vblank->count, diff, cur_vblank, vblank->last); |
277 | ||
278 | if (diff == 0) { | |
279 | WARN_ON_ONCE(cur_vblank != vblank->last); | |
280 | return; | |
281 | } | |
282 | ||
283 | /* | |
284 | * Only reinitialize corresponding vblank timestamp if high-precision query | |
285 | * available and didn't fail, or we were called from the vblank interrupt. | |
286 | * Otherwise reinitialize delayed at next vblank interrupt and assign 0 | |
287 | * for now, to mark the vblanktimestamp as invalid. | |
288 | */ | |
138b87fa | 289 | if (!rc && !in_vblank_irq) |
67680d3c | 290 | t_vblank = 0; |
3ed4351a | 291 | |
67680d3c | 292 | store_vblank(dev, pipe, diff, t_vblank, cur_vblank); |
3ed4351a DV |
293 | } |
294 | ||
3b765c0b | 295 | static u64 drm_vblank_count(struct drm_device *dev, unsigned int pipe) |
3ed4351a DV |
296 | { |
297 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
298 | ||
299 | if (WARN_ON(pipe >= dev->num_crtcs)) | |
300 | return 0; | |
301 | ||
302 | return vblank->count; | |
303 | } | |
304 | ||
305 | /** | |
ca814b25 | 306 | * drm_crtc_accurate_vblank_count - retrieve the master vblank counter |
3ed4351a DV |
307 | * @crtc: which counter to retrieve |
308 | * | |
57d30230 DV |
309 | * This function is similar to drm_crtc_vblank_count() but this function |
310 | * interpolates to handle a race with vblank interrupts using the high precision | |
311 | * timestamping support. | |
3ed4351a | 312 | * |
57d30230 DV |
313 | * This is mostly useful for hardware that can obtain the scanout position, but |
314 | * doesn't have a hardware frame counter. | |
3ed4351a | 315 | */ |
3b765c0b | 316 | u64 drm_crtc_accurate_vblank_count(struct drm_crtc *crtc) |
3ed4351a DV |
317 | { |
318 | struct drm_device *dev = crtc->dev; | |
319 | unsigned int pipe = drm_crtc_index(crtc); | |
3b765c0b | 320 | u64 vblank; |
3ed4351a DV |
321 | unsigned long flags; |
322 | ||
a111fbc4 VS |
323 | WARN_ONCE(drm_debug & DRM_UT_VBL && !dev->driver->get_vblank_timestamp, |
324 | "This function requires support for accurate vblank timestamps."); | |
3ed4351a DV |
325 | |
326 | spin_lock_irqsave(&dev->vblank_time_lock, flags); | |
327 | ||
328 | drm_update_vblank_count(dev, pipe, false); | |
329 | vblank = drm_vblank_count(dev, pipe); | |
330 | ||
331 | spin_unlock_irqrestore(&dev->vblank_time_lock, flags); | |
332 | ||
333 | return vblank; | |
334 | } | |
ca814b25 | 335 | EXPORT_SYMBOL(drm_crtc_accurate_vblank_count); |
3ed4351a DV |
336 | |
337 | static void __disable_vblank(struct drm_device *dev, unsigned int pipe) | |
338 | { | |
339 | if (drm_core_check_feature(dev, DRIVER_MODESET)) { | |
340 | struct drm_crtc *crtc = drm_crtc_from_index(dev, pipe); | |
341 | ||
4ffb8dee JM |
342 | if (WARN_ON(!crtc)) |
343 | return; | |
344 | ||
3ed4351a DV |
345 | if (crtc->funcs->disable_vblank) { |
346 | crtc->funcs->disable_vblank(crtc); | |
347 | return; | |
348 | } | |
349 | } | |
350 | ||
351 | dev->driver->disable_vblank(dev, pipe); | |
352 | } | |
353 | ||
354 | /* | |
355 | * Disable vblank irq's on crtc, make sure that last vblank count | |
356 | * of hardware and corresponding consistent software vblank counter | |
357 | * are preserved, even if there are any spurious vblank irq's after | |
358 | * disable. | |
359 | */ | |
360 | void drm_vblank_disable_and_save(struct drm_device *dev, unsigned int pipe) | |
361 | { | |
362 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
363 | unsigned long irqflags; | |
364 | ||
365 | assert_spin_locked(&dev->vbl_lock); | |
366 | ||
367 | /* Prevent vblank irq processing while disabling vblank irqs, | |
368 | * so no updates of timestamps or count can happen after we've | |
369 | * disabled. Needed to prevent races in case of delayed irq's. | |
370 | */ | |
371 | spin_lock_irqsave(&dev->vblank_time_lock, irqflags); | |
372 | ||
373 | /* | |
68036b08 DP |
374 | * Update vblank count and disable vblank interrupts only if the |
375 | * interrupts were enabled. This avoids calling the ->disable_vblank() | |
376 | * operation in atomic context with the hardware potentially runtime | |
377 | * suspended. | |
3ed4351a | 378 | */ |
68036b08 DP |
379 | if (!vblank->enabled) |
380 | goto out; | |
3ed4351a DV |
381 | |
382 | /* | |
68036b08 | 383 | * Update the count and timestamp to maintain the |
3ed4351a DV |
384 | * appearance that the counter has been ticking all along until |
385 | * this time. This makes the count account for the entire time | |
386 | * between drm_crtc_vblank_on() and drm_crtc_vblank_off(). | |
387 | */ | |
388 | drm_update_vblank_count(dev, pipe, false); | |
68036b08 DP |
389 | __disable_vblank(dev, pipe); |
390 | vblank->enabled = false; | |
3ed4351a | 391 | |
68036b08 | 392 | out: |
3ed4351a DV |
393 | spin_unlock_irqrestore(&dev->vblank_time_lock, irqflags); |
394 | } | |
395 | ||
e99e88a9 | 396 | static void vblank_disable_fn(struct timer_list *t) |
3ed4351a | 397 | { |
e99e88a9 | 398 | struct drm_vblank_crtc *vblank = from_timer(vblank, t, disable_timer); |
3ed4351a DV |
399 | struct drm_device *dev = vblank->dev; |
400 | unsigned int pipe = vblank->pipe; | |
401 | unsigned long irqflags; | |
402 | ||
403 | spin_lock_irqsave(&dev->vbl_lock, irqflags); | |
404 | if (atomic_read(&vblank->refcount) == 0 && vblank->enabled) { | |
405 | DRM_DEBUG("disabling vblank on crtc %u\n", pipe); | |
406 | drm_vblank_disable_and_save(dev, pipe); | |
407 | } | |
408 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); | |
409 | } | |
410 | ||
3ed4351a DV |
411 | void drm_vblank_cleanup(struct drm_device *dev) |
412 | { | |
413 | unsigned int pipe; | |
414 | ||
415 | /* Bail if the driver didn't call drm_vblank_init() */ | |
416 | if (dev->num_crtcs == 0) | |
417 | return; | |
418 | ||
419 | for (pipe = 0; pipe < dev->num_crtcs; pipe++) { | |
420 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
421 | ||
422 | WARN_ON(READ_ONCE(vblank->enabled) && | |
423 | drm_core_check_feature(dev, DRIVER_MODESET)); | |
424 | ||
425 | del_timer_sync(&vblank->disable_timer); | |
426 | } | |
427 | ||
428 | kfree(dev->vblank); | |
429 | ||
430 | dev->num_crtcs = 0; | |
431 | } | |
3ed4351a DV |
432 | |
433 | /** | |
434 | * drm_vblank_init - initialize vblank support | |
435 | * @dev: DRM device | |
436 | * @num_crtcs: number of CRTCs supported by @dev | |
437 | * | |
438 | * This function initializes vblank support for @num_crtcs display pipelines. | |
b4164d66 DV |
439 | * Cleanup is handled by the DRM core, or through calling drm_dev_fini() for |
440 | * drivers with a &drm_driver.release callback. | |
3ed4351a DV |
441 | * |
442 | * Returns: | |
443 | * Zero on success or a negative error code on failure. | |
444 | */ | |
445 | int drm_vblank_init(struct drm_device *dev, unsigned int num_crtcs) | |
446 | { | |
447 | int ret = -ENOMEM; | |
448 | unsigned int i; | |
449 | ||
450 | spin_lock_init(&dev->vbl_lock); | |
451 | spin_lock_init(&dev->vblank_time_lock); | |
452 | ||
453 | dev->num_crtcs = num_crtcs; | |
454 | ||
455 | dev->vblank = kcalloc(num_crtcs, sizeof(*dev->vblank), GFP_KERNEL); | |
456 | if (!dev->vblank) | |
457 | goto err; | |
458 | ||
459 | for (i = 0; i < num_crtcs; i++) { | |
460 | struct drm_vblank_crtc *vblank = &dev->vblank[i]; | |
461 | ||
462 | vblank->dev = dev; | |
463 | vblank->pipe = i; | |
464 | init_waitqueue_head(&vblank->queue); | |
e99e88a9 | 465 | timer_setup(&vblank->disable_timer, vblank_disable_fn, 0); |
3ed4351a DV |
466 | seqlock_init(&vblank->seqlock); |
467 | } | |
468 | ||
469 | DRM_INFO("Supports vblank timestamp caching Rev 2 (21.10.2013).\n"); | |
470 | ||
471 | /* Driver specific high-precision vblank timestamping supported? */ | |
472 | if (dev->driver->get_vblank_timestamp) | |
473 | DRM_INFO("Driver supports precise vblank timestamp query.\n"); | |
474 | else | |
475 | DRM_INFO("No driver support for vblank timestamp query.\n"); | |
476 | ||
477 | /* Must have precise timestamping for reliable vblank instant disable */ | |
478 | if (dev->vblank_disable_immediate && !dev->driver->get_vblank_timestamp) { | |
479 | dev->vblank_disable_immediate = false; | |
480 | DRM_INFO("Setting vblank_disable_immediate to false because " | |
481 | "get_vblank_timestamp == NULL\n"); | |
482 | } | |
483 | ||
484 | return 0; | |
485 | ||
486 | err: | |
487 | dev->num_crtcs = 0; | |
488 | return ret; | |
489 | } | |
490 | EXPORT_SYMBOL(drm_vblank_init); | |
491 | ||
492 | /** | |
493 | * drm_crtc_vblank_waitqueue - get vblank waitqueue for the CRTC | |
494 | * @crtc: which CRTC's vblank waitqueue to retrieve | |
495 | * | |
496 | * This function returns a pointer to the vblank waitqueue for the CRTC. | |
497 | * Drivers can use this to implement vblank waits using wait_event() and related | |
498 | * functions. | |
499 | */ | |
500 | wait_queue_head_t *drm_crtc_vblank_waitqueue(struct drm_crtc *crtc) | |
501 | { | |
502 | return &crtc->dev->vblank[drm_crtc_index(crtc)].queue; | |
503 | } | |
504 | EXPORT_SYMBOL(drm_crtc_vblank_waitqueue); | |
505 | ||
506 | ||
507 | /** | |
508 | * drm_calc_timestamping_constants - calculate vblank timestamp constants | |
509 | * @crtc: drm_crtc whose timestamp constants should be updated. | |
510 | * @mode: display mode containing the scanout timings | |
511 | * | |
57d30230 DV |
512 | * Calculate and store various constants which are later needed by vblank and |
513 | * swap-completion timestamping, e.g, by | |
514 | * drm_calc_vbltimestamp_from_scanoutpos(). They are derived from CRTC's true | |
515 | * scanout timing, so they take things like panel scaling or other adjustments | |
516 | * into account. | |
3ed4351a DV |
517 | */ |
518 | void drm_calc_timestamping_constants(struct drm_crtc *crtc, | |
519 | const struct drm_display_mode *mode) | |
520 | { | |
521 | struct drm_device *dev = crtc->dev; | |
522 | unsigned int pipe = drm_crtc_index(crtc); | |
523 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
524 | int linedur_ns = 0, framedur_ns = 0; | |
525 | int dotclock = mode->crtc_clock; | |
526 | ||
527 | if (!dev->num_crtcs) | |
528 | return; | |
529 | ||
530 | if (WARN_ON(pipe >= dev->num_crtcs)) | |
531 | return; | |
532 | ||
533 | /* Valid dotclock? */ | |
534 | if (dotclock > 0) { | |
535 | int frame_size = mode->crtc_htotal * mode->crtc_vtotal; | |
536 | ||
537 | /* | |
538 | * Convert scanline length in pixels and video | |
539 | * dot clock to line duration and frame duration | |
540 | * in nanoseconds: | |
541 | */ | |
542 | linedur_ns = div_u64((u64) mode->crtc_htotal * 1000000, dotclock); | |
543 | framedur_ns = div_u64((u64) frame_size * 1000000, dotclock); | |
544 | ||
545 | /* | |
546 | * Fields of interlaced scanout modes are only half a frame duration. | |
547 | */ | |
548 | if (mode->flags & DRM_MODE_FLAG_INTERLACE) | |
549 | framedur_ns /= 2; | |
550 | } else | |
551 | DRM_ERROR("crtc %u: Can't calculate constants, dotclock = 0!\n", | |
552 | crtc->base.id); | |
553 | ||
554 | vblank->linedur_ns = linedur_ns; | |
555 | vblank->framedur_ns = framedur_ns; | |
556 | vblank->hwmode = *mode; | |
557 | ||
558 | DRM_DEBUG("crtc %u: hwmode: htotal %d, vtotal %d, vdisplay %d\n", | |
559 | crtc->base.id, mode->crtc_htotal, | |
560 | mode->crtc_vtotal, mode->crtc_vdisplay); | |
561 | DRM_DEBUG("crtc %u: clock %d kHz framedur %d linedur %d\n", | |
562 | crtc->base.id, dotclock, framedur_ns, linedur_ns); | |
563 | } | |
564 | EXPORT_SYMBOL(drm_calc_timestamping_constants); | |
565 | ||
566 | /** | |
567 | * drm_calc_vbltimestamp_from_scanoutpos - precise vblank timestamp helper | |
568 | * @dev: DRM device | |
569 | * @pipe: index of CRTC whose vblank timestamp to retrieve | |
570 | * @max_error: Desired maximum allowable error in timestamps (nanosecs) | |
571 | * On return contains true maximum error of timestamp | |
67680d3c | 572 | * @vblank_time: Pointer to time which should receive the timestamp |
3ed4351a DV |
573 | * @in_vblank_irq: |
574 | * True when called from drm_crtc_handle_vblank(). Some drivers | |
575 | * need to apply some workarounds for gpu-specific vblank irq quirks | |
576 | * if flag is set. | |
577 | * | |
578 | * Implements calculation of exact vblank timestamps from given drm_display_mode | |
57d30230 DV |
579 | * timings and current video scanout position of a CRTC. This can be directly |
580 | * used as the &drm_driver.get_vblank_timestamp implementation of a kms driver | |
581 | * if &drm_driver.get_scanout_position is implemented. | |
3ed4351a | 582 | * |
57d30230 DV |
583 | * The current implementation only handles standard video modes. For double scan |
584 | * and interlaced modes the driver is supposed to adjust the hardware mode | |
585 | * (taken from &drm_crtc_state.adjusted mode for atomic modeset drivers) to | |
586 | * match the scanout position reported. | |
3ed4351a DV |
587 | * |
588 | * Note that atomic drivers must call drm_calc_timestamping_constants() before | |
589 | * enabling a CRTC. The atomic helpers already take care of that in | |
590 | * drm_atomic_helper_update_legacy_modeset_state(). | |
591 | * | |
592 | * Returns: | |
593 | * | |
594 | * Returns true on success, and false on failure, i.e. when no accurate | |
595 | * timestamp could be acquired. | |
596 | */ | |
597 | bool drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev, | |
598 | unsigned int pipe, | |
599 | int *max_error, | |
67680d3c | 600 | ktime_t *vblank_time, |
3ed4351a DV |
601 | bool in_vblank_irq) |
602 | { | |
67680d3c | 603 | struct timespec64 ts_etime, ts_vblank_time; |
3ed4351a DV |
604 | ktime_t stime, etime; |
605 | bool vbl_status; | |
606 | struct drm_crtc *crtc; | |
607 | const struct drm_display_mode *mode; | |
608 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
609 | int vpos, hpos, i; | |
610 | int delta_ns, duration_ns; | |
611 | ||
612 | if (!drm_core_check_feature(dev, DRIVER_MODESET)) | |
613 | return false; | |
614 | ||
615 | crtc = drm_crtc_from_index(dev, pipe); | |
616 | ||
617 | if (pipe >= dev->num_crtcs || !crtc) { | |
618 | DRM_ERROR("Invalid crtc %u\n", pipe); | |
619 | return false; | |
620 | } | |
621 | ||
622 | /* Scanout position query not supported? Should not happen. */ | |
623 | if (!dev->driver->get_scanout_position) { | |
624 | DRM_ERROR("Called from driver w/o get_scanout_position()!?\n"); | |
625 | return false; | |
626 | } | |
627 | ||
628 | if (drm_drv_uses_atomic_modeset(dev)) | |
629 | mode = &vblank->hwmode; | |
630 | else | |
631 | mode = &crtc->hwmode; | |
632 | ||
633 | /* If mode timing undefined, just return as no-op: | |
634 | * Happens during initial modesetting of a crtc. | |
635 | */ | |
636 | if (mode->crtc_clock == 0) { | |
637 | DRM_DEBUG("crtc %u: Noop due to uninitialized mode.\n", pipe); | |
638 | WARN_ON_ONCE(drm_drv_uses_atomic_modeset(dev)); | |
639 | ||
640 | return false; | |
641 | } | |
642 | ||
643 | /* Get current scanout position with system timestamp. | |
644 | * Repeat query up to DRM_TIMESTAMP_MAXRETRIES times | |
645 | * if single query takes longer than max_error nanoseconds. | |
646 | * | |
647 | * This guarantees a tight bound on maximum error if | |
648 | * code gets preempted or delayed for some reason. | |
649 | */ | |
650 | for (i = 0; i < DRM_TIMESTAMP_MAXRETRIES; i++) { | |
651 | /* | |
652 | * Get vertical and horizontal scanout position vpos, hpos, | |
653 | * and bounding timestamps stime, etime, pre/post query. | |
654 | */ | |
655 | vbl_status = dev->driver->get_scanout_position(dev, pipe, | |
656 | in_vblank_irq, | |
657 | &vpos, &hpos, | |
658 | &stime, &etime, | |
659 | mode); | |
660 | ||
661 | /* Return as no-op if scanout query unsupported or failed. */ | |
662 | if (!vbl_status) { | |
663 | DRM_DEBUG("crtc %u : scanoutpos query failed.\n", | |
664 | pipe); | |
665 | return false; | |
666 | } | |
667 | ||
668 | /* Compute uncertainty in timestamp of scanout position query. */ | |
669 | duration_ns = ktime_to_ns(etime) - ktime_to_ns(stime); | |
670 | ||
671 | /* Accept result with < max_error nsecs timing uncertainty. */ | |
672 | if (duration_ns <= *max_error) | |
673 | break; | |
674 | } | |
675 | ||
676 | /* Noisy system timing? */ | |
677 | if (i == DRM_TIMESTAMP_MAXRETRIES) { | |
678 | DRM_DEBUG("crtc %u: Noisy timestamp %d us > %d us [%d reps].\n", | |
679 | pipe, duration_ns/1000, *max_error/1000, i); | |
680 | } | |
681 | ||
682 | /* Return upper bound of timestamp precision error. */ | |
683 | *max_error = duration_ns; | |
684 | ||
685 | /* Convert scanout position into elapsed time at raw_time query | |
686 | * since start of scanout at first display scanline. delta_ns | |
687 | * can be negative if start of scanout hasn't happened yet. | |
688 | */ | |
689 | delta_ns = div_s64(1000000LL * (vpos * mode->crtc_htotal + hpos), | |
690 | mode->crtc_clock); | |
691 | ||
3ed4351a DV |
692 | /* Subtract time delta from raw timestamp to get final |
693 | * vblank_time timestamp for end of vblank. | |
694 | */ | |
bcbec31c VS |
695 | *vblank_time = ktime_sub_ns(etime, delta_ns); |
696 | ||
697 | if ((drm_debug & DRM_UT_VBL) == 0) | |
698 | return true; | |
699 | ||
700 | ts_etime = ktime_to_timespec64(etime); | |
701 | ts_vblank_time = ktime_to_timespec64(*vblank_time); | |
3ed4351a | 702 | |
67680d3c | 703 | DRM_DEBUG_VBL("crtc %u : v p(%d,%d)@ %lld.%06ld -> %lld.%06ld [e %d us, %d rep]\n", |
3ed4351a | 704 | pipe, hpos, vpos, |
67680d3c AB |
705 | (u64)ts_etime.tv_sec, ts_etime.tv_nsec / 1000, |
706 | (u64)ts_vblank_time.tv_sec, ts_vblank_time.tv_nsec / 1000, | |
707 | duration_ns / 1000, i); | |
3ed4351a DV |
708 | |
709 | return true; | |
710 | } | |
711 | EXPORT_SYMBOL(drm_calc_vbltimestamp_from_scanoutpos); | |
712 | ||
3ed4351a DV |
713 | /** |
714 | * drm_get_last_vbltimestamp - retrieve raw timestamp for the most recent | |
715 | * vblank interval | |
716 | * @dev: DRM device | |
717 | * @pipe: index of CRTC whose vblank timestamp to retrieve | |
67680d3c | 718 | * @tvblank: Pointer to target time which should receive the timestamp |
3ed4351a DV |
719 | * @in_vblank_irq: |
720 | * True when called from drm_crtc_handle_vblank(). Some drivers | |
721 | * need to apply some workarounds for gpu-specific vblank irq quirks | |
722 | * if flag is set. | |
723 | * | |
724 | * Fetches the system timestamp corresponding to the time of the most recent | |
725 | * vblank interval on specified CRTC. May call into kms-driver to | |
726 | * compute the timestamp with a high-precision GPU specific method. | |
727 | * | |
728 | * Returns zero if timestamp originates from uncorrected do_gettimeofday() | |
729 | * call, i.e., it isn't very precisely locked to the true vblank. | |
730 | * | |
731 | * Returns: | |
732 | * True if timestamp is considered to be very precise, false otherwise. | |
733 | */ | |
734 | static bool | |
735 | drm_get_last_vbltimestamp(struct drm_device *dev, unsigned int pipe, | |
67680d3c | 736 | ktime_t *tvblank, bool in_vblank_irq) |
3ed4351a DV |
737 | { |
738 | bool ret = false; | |
739 | ||
740 | /* Define requested maximum error on timestamps (nanoseconds). */ | |
741 | int max_error = (int) drm_timestamp_precision * 1000; | |
742 | ||
743 | /* Query driver if possible and precision timestamping enabled. */ | |
744 | if (dev->driver->get_vblank_timestamp && (max_error > 0)) | |
745 | ret = dev->driver->get_vblank_timestamp(dev, pipe, &max_error, | |
746 | tvblank, in_vblank_irq); | |
747 | ||
748 | /* GPU high precision timestamp query unsupported or failed. | |
749 | * Return current monotonic/gettimeofday timestamp as best estimate. | |
750 | */ | |
751 | if (!ret) | |
25e1a798 | 752 | *tvblank = ktime_get(); |
3ed4351a DV |
753 | |
754 | return ret; | |
755 | } | |
756 | ||
757 | /** | |
758 | * drm_crtc_vblank_count - retrieve "cooked" vblank counter value | |
759 | * @crtc: which counter to retrieve | |
760 | * | |
761 | * Fetches the "cooked" vblank count value that represents the number of | |
762 | * vblank events since the system was booted, including lost events due to | |
57d30230 DV |
763 | * modesetting activity. Note that this timer isn't correct against a racing |
764 | * vblank interrupt (since it only reports the software vblank counter), see | |
ca814b25 | 765 | * drm_crtc_accurate_vblank_count() for such use-cases. |
3ed4351a DV |
766 | * |
767 | * Returns: | |
768 | * The software vblank counter. | |
769 | */ | |
570e8696 | 770 | u64 drm_crtc_vblank_count(struct drm_crtc *crtc) |
3ed4351a DV |
771 | { |
772 | return drm_vblank_count(crtc->dev, drm_crtc_index(crtc)); | |
773 | } | |
774 | EXPORT_SYMBOL(drm_crtc_vblank_count); | |
775 | ||
570e8696 KP |
776 | /** |
777 | * drm_vblank_count_and_time - retrieve "cooked" vblank counter value and the | |
778 | * system timestamp corresponding to that vblank counter value. | |
779 | * @dev: DRM device | |
780 | * @pipe: index of CRTC whose counter to retrieve | |
781 | * @vblanktime: Pointer to ktime_t to receive the vblank timestamp. | |
782 | * | |
783 | * Fetches the "cooked" vblank count value that represents the number of | |
784 | * vblank events since the system was booted, including lost events due to | |
785 | * modesetting activity. Returns corresponding system timestamp of the time | |
786 | * of the vblank interval that corresponds to the current vblank counter value. | |
787 | * | |
788 | * This is the legacy version of drm_crtc_vblank_count_and_time(). | |
789 | */ | |
790 | static u64 drm_vblank_count_and_time(struct drm_device *dev, unsigned int pipe, | |
67680d3c | 791 | ktime_t *vblanktime) |
3ed4351a DV |
792 | { |
793 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
570e8696 | 794 | u64 vblank_count; |
3ed4351a DV |
795 | unsigned int seq; |
796 | ||
797 | if (WARN_ON(pipe >= dev->num_crtcs)) { | |
67680d3c | 798 | *vblanktime = 0; |
3ed4351a DV |
799 | return 0; |
800 | } | |
801 | ||
802 | do { | |
803 | seq = read_seqbegin(&vblank->seqlock); | |
804 | vblank_count = vblank->count; | |
805 | *vblanktime = vblank->time; | |
806 | } while (read_seqretry(&vblank->seqlock, seq)); | |
807 | ||
808 | return vblank_count; | |
809 | } | |
810 | ||
811 | /** | |
812 | * drm_crtc_vblank_count_and_time - retrieve "cooked" vblank counter value | |
813 | * and the system timestamp corresponding to that vblank counter value | |
814 | * @crtc: which counter to retrieve | |
67680d3c | 815 | * @vblanktime: Pointer to time to receive the vblank timestamp. |
3ed4351a DV |
816 | * |
817 | * Fetches the "cooked" vblank count value that represents the number of | |
818 | * vblank events since the system was booted, including lost events due to | |
819 | * modesetting activity. Returns corresponding system timestamp of the time | |
820 | * of the vblank interval that corresponds to the current vblank counter value. | |
821 | */ | |
570e8696 | 822 | u64 drm_crtc_vblank_count_and_time(struct drm_crtc *crtc, |
67680d3c | 823 | ktime_t *vblanktime) |
3ed4351a DV |
824 | { |
825 | return drm_vblank_count_and_time(crtc->dev, drm_crtc_index(crtc), | |
826 | vblanktime); | |
827 | } | |
828 | EXPORT_SYMBOL(drm_crtc_vblank_count_and_time); | |
829 | ||
830 | static void send_vblank_event(struct drm_device *dev, | |
831 | struct drm_pending_vblank_event *e, | |
570e8696 | 832 | u64 seq, ktime_t now) |
3ed4351a | 833 | { |
bd386e51 | 834 | struct timespec64 tv; |
3ed4351a | 835 | |
bd386e51 KP |
836 | switch (e->event.base.type) { |
837 | case DRM_EVENT_VBLANK: | |
838 | case DRM_EVENT_FLIP_COMPLETE: | |
839 | tv = ktime_to_timespec64(now); | |
840 | e->event.vbl.sequence = seq; | |
841 | /* | |
842 | * e->event is a user space structure, with hardcoded unsigned | |
843 | * 32-bit seconds/microseconds. This is safe as we always use | |
844 | * monotonic timestamps since linux-4.15 | |
845 | */ | |
846 | e->event.vbl.tv_sec = tv.tv_sec; | |
847 | e->event.vbl.tv_usec = tv.tv_nsec / 1000; | |
848 | break; | |
3064abfa KP |
849 | case DRM_EVENT_CRTC_SEQUENCE: |
850 | if (seq) | |
851 | e->event.seq.sequence = seq; | |
852 | e->event.seq.time_ns = ktime_to_ns(now); | |
853 | break; | |
bd386e51 KP |
854 | } |
855 | trace_drm_vblank_event_delivered(e->base.file_priv, e->pipe, seq); | |
3ed4351a DV |
856 | drm_send_event_locked(dev, &e->base); |
857 | } | |
858 | ||
859 | /** | |
860 | * drm_crtc_arm_vblank_event - arm vblank event after pageflip | |
861 | * @crtc: the source CRTC of the vblank event | |
862 | * @e: the event to send | |
863 | * | |
864 | * A lot of drivers need to generate vblank events for the very next vblank | |
865 | * interrupt. For example when the page flip interrupt happens when the page | |
866 | * flip gets armed, but not when it actually executes within the next vblank | |
867 | * period. This helper function implements exactly the required vblank arming | |
868 | * behaviour. | |
869 | * | |
870 | * NOTE: Drivers using this to send out the &drm_crtc_state.event as part of an | |
871 | * atomic commit must ensure that the next vblank happens at exactly the same | |
872 | * time as the atomic commit is committed to the hardware. This function itself | |
e13a0583 | 873 | * does **not** protect against the next vblank interrupt racing with either this |
3ed4351a DV |
874 | * function call or the atomic commit operation. A possible sequence could be: |
875 | * | |
876 | * 1. Driver commits new hardware state into vblank-synchronized registers. | |
877 | * 2. A vblank happens, committing the hardware state. Also the corresponding | |
878 | * vblank interrupt is fired off and fully processed by the interrupt | |
879 | * handler. | |
880 | * 3. The atomic commit operation proceeds to call drm_crtc_arm_vblank_event(). | |
881 | * 4. The event is only send out for the next vblank, which is wrong. | |
882 | * | |
883 | * An equivalent race can happen when the driver calls | |
884 | * drm_crtc_arm_vblank_event() before writing out the new hardware state. | |
885 | * | |
886 | * The only way to make this work safely is to prevent the vblank from firing | |
887 | * (and the hardware from committing anything else) until the entire atomic | |
888 | * commit sequence has run to completion. If the hardware does not have such a | |
889 | * feature (e.g. using a "go" bit), then it is unsafe to use this functions. | |
890 | * Instead drivers need to manually send out the event from their interrupt | |
891 | * handler by calling drm_crtc_send_vblank_event() and make sure that there's no | |
892 | * possible race with the hardware committing the atomic update. | |
893 | * | |
e750218d SA |
894 | * Caller must hold a vblank reference for the event @e acquired by a |
895 | * drm_crtc_vblank_get(), which will be dropped when the next vblank arrives. | |
3ed4351a DV |
896 | */ |
897 | void drm_crtc_arm_vblank_event(struct drm_crtc *crtc, | |
898 | struct drm_pending_vblank_event *e) | |
899 | { | |
900 | struct drm_device *dev = crtc->dev; | |
901 | unsigned int pipe = drm_crtc_index(crtc); | |
902 | ||
903 | assert_spin_locked(&dev->event_lock); | |
904 | ||
905 | e->pipe = pipe; | |
570e8696 | 906 | e->sequence = drm_crtc_accurate_vblank_count(crtc) + 1; |
3ed4351a DV |
907 | list_add_tail(&e->base.link, &dev->vblank_event_list); |
908 | } | |
909 | EXPORT_SYMBOL(drm_crtc_arm_vblank_event); | |
910 | ||
911 | /** | |
912 | * drm_crtc_send_vblank_event - helper to send vblank event after pageflip | |
913 | * @crtc: the source CRTC of the vblank event | |
914 | * @e: the event to send | |
915 | * | |
916 | * Updates sequence # and timestamp on event for the most recently processed | |
917 | * vblank, and sends it to userspace. Caller must hold event lock. | |
918 | * | |
919 | * See drm_crtc_arm_vblank_event() for a helper which can be used in certain | |
920 | * situation, especially to send out events for atomic commit operations. | |
921 | */ | |
922 | void drm_crtc_send_vblank_event(struct drm_crtc *crtc, | |
923 | struct drm_pending_vblank_event *e) | |
924 | { | |
925 | struct drm_device *dev = crtc->dev; | |
570e8696 KP |
926 | u64 seq; |
927 | unsigned int pipe = drm_crtc_index(crtc); | |
67680d3c | 928 | ktime_t now; |
3ed4351a DV |
929 | |
930 | if (dev->num_crtcs > 0) { | |
931 | seq = drm_vblank_count_and_time(dev, pipe, &now); | |
932 | } else { | |
933 | seq = 0; | |
934 | ||
25e1a798 | 935 | now = ktime_get(); |
3ed4351a DV |
936 | } |
937 | e->pipe = pipe; | |
67680d3c | 938 | send_vblank_event(dev, e, seq, now); |
3ed4351a DV |
939 | } |
940 | EXPORT_SYMBOL(drm_crtc_send_vblank_event); | |
941 | ||
942 | static int __enable_vblank(struct drm_device *dev, unsigned int pipe) | |
943 | { | |
944 | if (drm_core_check_feature(dev, DRIVER_MODESET)) { | |
945 | struct drm_crtc *crtc = drm_crtc_from_index(dev, pipe); | |
946 | ||
4ffb8dee JM |
947 | if (WARN_ON(!crtc)) |
948 | return 0; | |
949 | ||
3ed4351a DV |
950 | if (crtc->funcs->enable_vblank) |
951 | return crtc->funcs->enable_vblank(crtc); | |
952 | } | |
953 | ||
954 | return dev->driver->enable_vblank(dev, pipe); | |
955 | } | |
956 | ||
3ed4351a DV |
957 | static int drm_vblank_enable(struct drm_device *dev, unsigned int pipe) |
958 | { | |
959 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
960 | int ret = 0; | |
961 | ||
962 | assert_spin_locked(&dev->vbl_lock); | |
963 | ||
964 | spin_lock(&dev->vblank_time_lock); | |
965 | ||
966 | if (!vblank->enabled) { | |
967 | /* | |
968 | * Enable vblank irqs under vblank_time_lock protection. | |
969 | * All vblank count & timestamp updates are held off | |
970 | * until we are done reinitializing master counter and | |
971 | * timestamps. Filtercode in drm_handle_vblank() will | |
972 | * prevent double-accounting of same vblank interval. | |
973 | */ | |
974 | ret = __enable_vblank(dev, pipe); | |
975 | DRM_DEBUG("enabling vblank on crtc %u, ret: %d\n", pipe, ret); | |
976 | if (ret) { | |
977 | atomic_dec(&vblank->refcount); | |
978 | } else { | |
979 | drm_update_vblank_count(dev, pipe, 0); | |
980 | /* drm_update_vblank_count() includes a wmb so we just | |
981 | * need to ensure that the compiler emits the write | |
982 | * to mark the vblank as enabled after the call | |
983 | * to drm_update_vblank_count(). | |
984 | */ | |
985 | WRITE_ONCE(vblank->enabled, true); | |
986 | } | |
987 | } | |
988 | ||
989 | spin_unlock(&dev->vblank_time_lock); | |
990 | ||
991 | return ret; | |
992 | } | |
993 | ||
3ed4351a DV |
994 | static int drm_vblank_get(struct drm_device *dev, unsigned int pipe) |
995 | { | |
996 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
997 | unsigned long irqflags; | |
998 | int ret = 0; | |
999 | ||
1000 | if (!dev->num_crtcs) | |
1001 | return -EINVAL; | |
1002 | ||
1003 | if (WARN_ON(pipe >= dev->num_crtcs)) | |
1004 | return -EINVAL; | |
1005 | ||
1006 | spin_lock_irqsave(&dev->vbl_lock, irqflags); | |
1007 | /* Going from 0->1 means we have to enable interrupts again */ | |
1008 | if (atomic_add_return(1, &vblank->refcount) == 1) { | |
1009 | ret = drm_vblank_enable(dev, pipe); | |
1010 | } else { | |
1011 | if (!vblank->enabled) { | |
1012 | atomic_dec(&vblank->refcount); | |
1013 | ret = -EINVAL; | |
1014 | } | |
1015 | } | |
1016 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); | |
1017 | ||
1018 | return ret; | |
1019 | } | |
1020 | ||
1021 | /** | |
1022 | * drm_crtc_vblank_get - get a reference count on vblank events | |
1023 | * @crtc: which CRTC to own | |
1024 | * | |
1025 | * Acquire a reference count on vblank events to avoid having them disabled | |
1026 | * while in use. | |
1027 | * | |
1028 | * Returns: | |
1029 | * Zero on success or a negative error code on failure. | |
1030 | */ | |
1031 | int drm_crtc_vblank_get(struct drm_crtc *crtc) | |
1032 | { | |
1033 | return drm_vblank_get(crtc->dev, drm_crtc_index(crtc)); | |
1034 | } | |
1035 | EXPORT_SYMBOL(drm_crtc_vblank_get); | |
1036 | ||
3ed4351a DV |
1037 | static void drm_vblank_put(struct drm_device *dev, unsigned int pipe) |
1038 | { | |
1039 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
1040 | ||
1041 | if (WARN_ON(pipe >= dev->num_crtcs)) | |
1042 | return; | |
1043 | ||
1044 | if (WARN_ON(atomic_read(&vblank->refcount) == 0)) | |
1045 | return; | |
1046 | ||
1047 | /* Last user schedules interrupt disable */ | |
1048 | if (atomic_dec_and_test(&vblank->refcount)) { | |
1049 | if (drm_vblank_offdelay == 0) | |
1050 | return; | |
1051 | else if (drm_vblank_offdelay < 0) | |
e99e88a9 | 1052 | vblank_disable_fn(&vblank->disable_timer); |
3ed4351a DV |
1053 | else if (!dev->vblank_disable_immediate) |
1054 | mod_timer(&vblank->disable_timer, | |
1055 | jiffies + ((drm_vblank_offdelay * HZ)/1000)); | |
1056 | } | |
1057 | } | |
1058 | ||
1059 | /** | |
1060 | * drm_crtc_vblank_put - give up ownership of vblank events | |
1061 | * @crtc: which counter to give up | |
1062 | * | |
1063 | * Release ownership of a given vblank counter, turning off interrupts | |
1064 | * if possible. Disable interrupts after drm_vblank_offdelay milliseconds. | |
1065 | */ | |
1066 | void drm_crtc_vblank_put(struct drm_crtc *crtc) | |
1067 | { | |
1068 | drm_vblank_put(crtc->dev, drm_crtc_index(crtc)); | |
1069 | } | |
1070 | EXPORT_SYMBOL(drm_crtc_vblank_put); | |
1071 | ||
1072 | /** | |
1073 | * drm_wait_one_vblank - wait for one vblank | |
1074 | * @dev: DRM device | |
1075 | * @pipe: CRTC index | |
1076 | * | |
1077 | * This waits for one vblank to pass on @pipe, using the irq driver interfaces. | |
1078 | * It is a failure to call this when the vblank irq for @pipe is disabled, e.g. | |
1079 | * due to lack of driver support or because the crtc is off. | |
57d30230 DV |
1080 | * |
1081 | * This is the legacy version of drm_crtc_wait_one_vblank(). | |
3ed4351a DV |
1082 | */ |
1083 | void drm_wait_one_vblank(struct drm_device *dev, unsigned int pipe) | |
1084 | { | |
1085 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
1086 | int ret; | |
3b765c0b | 1087 | u64 last; |
3ed4351a DV |
1088 | |
1089 | if (WARN_ON(pipe >= dev->num_crtcs)) | |
1090 | return; | |
1091 | ||
1092 | ret = drm_vblank_get(dev, pipe); | |
1093 | if (WARN(ret, "vblank not available on crtc %i, ret=%i\n", pipe, ret)) | |
1094 | return; | |
1095 | ||
1096 | last = drm_vblank_count(dev, pipe); | |
1097 | ||
1098 | ret = wait_event_timeout(vblank->queue, | |
1099 | last != drm_vblank_count(dev, pipe), | |
1100 | msecs_to_jiffies(100)); | |
1101 | ||
1102 | WARN(ret == 0, "vblank wait timed out on crtc %i\n", pipe); | |
1103 | ||
1104 | drm_vblank_put(dev, pipe); | |
1105 | } | |
1106 | EXPORT_SYMBOL(drm_wait_one_vblank); | |
1107 | ||
1108 | /** | |
1109 | * drm_crtc_wait_one_vblank - wait for one vblank | |
1110 | * @crtc: DRM crtc | |
1111 | * | |
1112 | * This waits for one vblank to pass on @crtc, using the irq driver interfaces. | |
1113 | * It is a failure to call this when the vblank irq for @crtc is disabled, e.g. | |
1114 | * due to lack of driver support or because the crtc is off. | |
1115 | */ | |
1116 | void drm_crtc_wait_one_vblank(struct drm_crtc *crtc) | |
1117 | { | |
1118 | drm_wait_one_vblank(crtc->dev, drm_crtc_index(crtc)); | |
1119 | } | |
1120 | EXPORT_SYMBOL(drm_crtc_wait_one_vblank); | |
1121 | ||
1122 | /** | |
1123 | * drm_crtc_vblank_off - disable vblank events on a CRTC | |
1124 | * @crtc: CRTC in question | |
1125 | * | |
1126 | * Drivers can use this function to shut down the vblank interrupt handling when | |
1127 | * disabling a crtc. This function ensures that the latest vblank frame count is | |
1128 | * stored so that drm_vblank_on can restore it again. | |
1129 | * | |
1130 | * Drivers must use this function when the hardware vblank counter can get | |
57d30230 | 1131 | * reset, e.g. when suspending or disabling the @crtc in general. |
3ed4351a DV |
1132 | */ |
1133 | void drm_crtc_vblank_off(struct drm_crtc *crtc) | |
1134 | { | |
1135 | struct drm_device *dev = crtc->dev; | |
1136 | unsigned int pipe = drm_crtc_index(crtc); | |
1137 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
1138 | struct drm_pending_vblank_event *e, *t; | |
67680d3c AB |
1139 | |
1140 | ktime_t now; | |
3ed4351a | 1141 | unsigned long irqflags; |
570e8696 | 1142 | u64 seq; |
3ed4351a DV |
1143 | |
1144 | if (WARN_ON(pipe >= dev->num_crtcs)) | |
1145 | return; | |
1146 | ||
1147 | spin_lock_irqsave(&dev->event_lock, irqflags); | |
1148 | ||
1149 | spin_lock(&dev->vbl_lock); | |
1150 | DRM_DEBUG_VBL("crtc %d, vblank enabled %d, inmodeset %d\n", | |
1151 | pipe, vblank->enabled, vblank->inmodeset); | |
1152 | ||
1153 | /* Avoid redundant vblank disables without previous | |
1154 | * drm_crtc_vblank_on(). */ | |
1155 | if (drm_core_check_feature(dev, DRIVER_ATOMIC) || !vblank->inmodeset) | |
1156 | drm_vblank_disable_and_save(dev, pipe); | |
1157 | ||
1158 | wake_up(&vblank->queue); | |
1159 | ||
1160 | /* | |
1161 | * Prevent subsequent drm_vblank_get() from re-enabling | |
1162 | * the vblank interrupt by bumping the refcount. | |
1163 | */ | |
1164 | if (!vblank->inmodeset) { | |
1165 | atomic_inc(&vblank->refcount); | |
1166 | vblank->inmodeset = 1; | |
1167 | } | |
1168 | spin_unlock(&dev->vbl_lock); | |
1169 | ||
1170 | /* Send any queued vblank events, lest the natives grow disquiet */ | |
1171 | seq = drm_vblank_count_and_time(dev, pipe, &now); | |
1172 | ||
1173 | list_for_each_entry_safe(e, t, &dev->vblank_event_list, base.link) { | |
1174 | if (e->pipe != pipe) | |
1175 | continue; | |
1176 | DRM_DEBUG("Sending premature vblank event on disable: " | |
570e8696 KP |
1177 | "wanted %llu, current %llu\n", |
1178 | e->sequence, seq); | |
3ed4351a DV |
1179 | list_del(&e->base.link); |
1180 | drm_vblank_put(dev, pipe); | |
67680d3c | 1181 | send_vblank_event(dev, e, seq, now); |
3ed4351a DV |
1182 | } |
1183 | spin_unlock_irqrestore(&dev->event_lock, irqflags); | |
1184 | ||
1185 | /* Will be reset by the modeset helpers when re-enabling the crtc by | |
1186 | * calling drm_calc_timestamping_constants(). */ | |
1187 | vblank->hwmode.crtc_clock = 0; | |
1188 | } | |
1189 | EXPORT_SYMBOL(drm_crtc_vblank_off); | |
1190 | ||
1191 | /** | |
1192 | * drm_crtc_vblank_reset - reset vblank state to off on a CRTC | |
1193 | * @crtc: CRTC in question | |
1194 | * | |
1195 | * Drivers can use this function to reset the vblank state to off at load time. | |
1196 | * Drivers should use this together with the drm_crtc_vblank_off() and | |
1197 | * drm_crtc_vblank_on() functions. The difference compared to | |
1198 | * drm_crtc_vblank_off() is that this function doesn't save the vblank counter | |
1199 | * and hence doesn't need to call any driver hooks. | |
57d30230 DV |
1200 | * |
1201 | * This is useful for recovering driver state e.g. on driver load, or on resume. | |
3ed4351a DV |
1202 | */ |
1203 | void drm_crtc_vblank_reset(struct drm_crtc *crtc) | |
1204 | { | |
1205 | struct drm_device *dev = crtc->dev; | |
1206 | unsigned long irqflags; | |
1207 | unsigned int pipe = drm_crtc_index(crtc); | |
1208 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
1209 | ||
1210 | spin_lock_irqsave(&dev->vbl_lock, irqflags); | |
1211 | /* | |
1212 | * Prevent subsequent drm_vblank_get() from enabling the vblank | |
1213 | * interrupt by bumping the refcount. | |
1214 | */ | |
1215 | if (!vblank->inmodeset) { | |
1216 | atomic_inc(&vblank->refcount); | |
1217 | vblank->inmodeset = 1; | |
1218 | } | |
1219 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); | |
1220 | ||
1221 | WARN_ON(!list_empty(&dev->vblank_event_list)); | |
1222 | } | |
1223 | EXPORT_SYMBOL(drm_crtc_vblank_reset); | |
1224 | ||
ed20151a VS |
1225 | /** |
1226 | * drm_crtc_set_max_vblank_count - configure the hw max vblank counter value | |
1227 | * @crtc: CRTC in question | |
1228 | * @max_vblank_count: max hardware vblank counter value | |
1229 | * | |
1230 | * Update the maximum hardware vblank counter value for @crtc | |
1231 | * at runtime. Useful for hardware where the operation of the | |
1232 | * hardware vblank counter depends on the currently active | |
1233 | * display configuration. | |
1234 | * | |
1235 | * For example, if the hardware vblank counter does not work | |
1236 | * when a specific connector is active the maximum can be set | |
1237 | * to zero. And when that specific connector isn't active the | |
1238 | * maximum can again be set to the appropriate non-zero value. | |
1239 | * | |
1240 | * If used, must be called before drm_vblank_on(). | |
1241 | */ | |
1242 | void drm_crtc_set_max_vblank_count(struct drm_crtc *crtc, | |
1243 | u32 max_vblank_count) | |
1244 | { | |
1245 | struct drm_device *dev = crtc->dev; | |
1246 | unsigned int pipe = drm_crtc_index(crtc); | |
1247 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
1248 | ||
1249 | WARN_ON(dev->max_vblank_count); | |
1250 | WARN_ON(!READ_ONCE(vblank->inmodeset)); | |
1251 | ||
1252 | vblank->max_vblank_count = max_vblank_count; | |
1253 | } | |
1254 | EXPORT_SYMBOL(drm_crtc_set_max_vblank_count); | |
1255 | ||
3ed4351a DV |
1256 | /** |
1257 | * drm_crtc_vblank_on - enable vblank events on a CRTC | |
1258 | * @crtc: CRTC in question | |
1259 | * | |
1260 | * This functions restores the vblank interrupt state captured with | |
57d30230 DV |
1261 | * drm_crtc_vblank_off() again and is generally called when enabling @crtc. Note |
1262 | * that calls to drm_crtc_vblank_on() and drm_crtc_vblank_off() can be | |
1263 | * unbalanced and so can also be unconditionally called in driver load code to | |
1264 | * reflect the current hardware state of the crtc. | |
3ed4351a DV |
1265 | */ |
1266 | void drm_crtc_vblank_on(struct drm_crtc *crtc) | |
1267 | { | |
1268 | struct drm_device *dev = crtc->dev; | |
1269 | unsigned int pipe = drm_crtc_index(crtc); | |
1270 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
1271 | unsigned long irqflags; | |
1272 | ||
1273 | if (WARN_ON(pipe >= dev->num_crtcs)) | |
1274 | return; | |
1275 | ||
1276 | spin_lock_irqsave(&dev->vbl_lock, irqflags); | |
1277 | DRM_DEBUG_VBL("crtc %d, vblank enabled %d, inmodeset %d\n", | |
1278 | pipe, vblank->enabled, vblank->inmodeset); | |
1279 | ||
1280 | /* Drop our private "prevent drm_vblank_get" refcount */ | |
1281 | if (vblank->inmodeset) { | |
1282 | atomic_dec(&vblank->refcount); | |
1283 | vblank->inmodeset = 0; | |
1284 | } | |
1285 | ||
1286 | drm_reset_vblank_timestamp(dev, pipe); | |
1287 | ||
1288 | /* | |
1289 | * re-enable interrupts if there are users left, or the | |
1290 | * user wishes vblank interrupts to be enabled all the time. | |
1291 | */ | |
1292 | if (atomic_read(&vblank->refcount) != 0 || drm_vblank_offdelay == 0) | |
1293 | WARN_ON(drm_vblank_enable(dev, pipe)); | |
1294 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); | |
1295 | } | |
1296 | EXPORT_SYMBOL(drm_crtc_vblank_on); | |
1297 | ||
d0bb96b4 | 1298 | /** |
ea3f0ef3 DP |
1299 | * drm_vblank_restore - estimate missed vblanks and update vblank count. |
1300 | * @dev: DRM device | |
1301 | * @pipe: CRTC index | |
d0bb96b4 DP |
1302 | * |
1303 | * Power manamement features can cause frame counter resets between vblank | |
ea3f0ef3 DP |
1304 | * disable and enable. Drivers can use this function in their |
1305 | * &drm_crtc_funcs.enable_vblank implementation to estimate missed vblanks since | |
1306 | * the last &drm_crtc_funcs.disable_vblank using timestamps and update the | |
1307 | * vblank counter. | |
d0bb96b4 DP |
1308 | * |
1309 | * This function is the legacy version of drm_crtc_vblank_restore(). | |
1310 | */ | |
1311 | void drm_vblank_restore(struct drm_device *dev, unsigned int pipe) | |
1312 | { | |
1313 | ktime_t t_vblank; | |
1314 | struct drm_vblank_crtc *vblank; | |
1315 | int framedur_ns; | |
1316 | u64 diff_ns; | |
1317 | u32 cur_vblank, diff = 1; | |
1318 | int count = DRM_TIMESTAMP_MAXRETRIES; | |
1319 | ||
1320 | if (WARN_ON(pipe >= dev->num_crtcs)) | |
1321 | return; | |
1322 | ||
1323 | assert_spin_locked(&dev->vbl_lock); | |
1324 | assert_spin_locked(&dev->vblank_time_lock); | |
1325 | ||
1326 | vblank = &dev->vblank[pipe]; | |
1327 | WARN_ONCE((drm_debug & DRM_UT_VBL) && !vblank->framedur_ns, | |
1328 | "Cannot compute missed vblanks without frame duration\n"); | |
1329 | framedur_ns = vblank->framedur_ns; | |
1330 | ||
1331 | do { | |
1332 | cur_vblank = __get_vblank_counter(dev, pipe); | |
1333 | drm_get_last_vbltimestamp(dev, pipe, &t_vblank, false); | |
1334 | } while (cur_vblank != __get_vblank_counter(dev, pipe) && --count > 0); | |
1335 | ||
1336 | diff_ns = ktime_to_ns(ktime_sub(t_vblank, vblank->time)); | |
1337 | if (framedur_ns) | |
1338 | diff = DIV_ROUND_CLOSEST_ULL(diff_ns, framedur_ns); | |
1339 | ||
1340 | ||
1341 | DRM_DEBUG_VBL("missed %d vblanks in %lld ns, frame duration=%d ns, hw_diff=%d\n", | |
1342 | diff, diff_ns, framedur_ns, cur_vblank - vblank->last); | |
1343 | store_vblank(dev, pipe, diff, t_vblank, cur_vblank); | |
1344 | } | |
1345 | EXPORT_SYMBOL(drm_vblank_restore); | |
1346 | ||
1347 | /** | |
ea3f0ef3 DP |
1348 | * drm_crtc_vblank_restore - estimate missed vblanks and update vblank count. |
1349 | * @crtc: CRTC in question | |
1350 | * | |
d0bb96b4 | 1351 | * Power manamement features can cause frame counter resets between vblank |
ea3f0ef3 DP |
1352 | * disable and enable. Drivers can use this function in their |
1353 | * &drm_crtc_funcs.enable_vblank implementation to estimate missed vblanks since | |
1354 | * the last &drm_crtc_funcs.disable_vblank using timestamps and update the | |
1355 | * vblank counter. | |
d0bb96b4 DP |
1356 | */ |
1357 | void drm_crtc_vblank_restore(struct drm_crtc *crtc) | |
1358 | { | |
1359 | drm_vblank_restore(crtc->dev, drm_crtc_index(crtc)); | |
1360 | } | |
1361 | EXPORT_SYMBOL(drm_crtc_vblank_restore); | |
1362 | ||
3ed4351a DV |
1363 | static void drm_legacy_vblank_pre_modeset(struct drm_device *dev, |
1364 | unsigned int pipe) | |
1365 | { | |
1366 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
1367 | ||
1368 | /* vblank is not initialized (IRQ not installed ?), or has been freed */ | |
1369 | if (!dev->num_crtcs) | |
1370 | return; | |
1371 | ||
1372 | if (WARN_ON(pipe >= dev->num_crtcs)) | |
1373 | return; | |
1374 | ||
1375 | /* | |
1376 | * To avoid all the problems that might happen if interrupts | |
1377 | * were enabled/disabled around or between these calls, we just | |
1378 | * have the kernel take a reference on the CRTC (just once though | |
1379 | * to avoid corrupting the count if multiple, mismatch calls occur), | |
1380 | * so that interrupts remain enabled in the interim. | |
1381 | */ | |
1382 | if (!vblank->inmodeset) { | |
1383 | vblank->inmodeset = 0x1; | |
1384 | if (drm_vblank_get(dev, pipe) == 0) | |
1385 | vblank->inmodeset |= 0x2; | |
1386 | } | |
1387 | } | |
1388 | ||
1389 | static void drm_legacy_vblank_post_modeset(struct drm_device *dev, | |
1390 | unsigned int pipe) | |
1391 | { | |
1392 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
1393 | unsigned long irqflags; | |
1394 | ||
1395 | /* vblank is not initialized (IRQ not installed ?), or has been freed */ | |
1396 | if (!dev->num_crtcs) | |
1397 | return; | |
1398 | ||
1399 | if (WARN_ON(pipe >= dev->num_crtcs)) | |
1400 | return; | |
1401 | ||
1402 | if (vblank->inmodeset) { | |
1403 | spin_lock_irqsave(&dev->vbl_lock, irqflags); | |
1404 | drm_reset_vblank_timestamp(dev, pipe); | |
1405 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); | |
1406 | ||
1407 | if (vblank->inmodeset & 0x2) | |
1408 | drm_vblank_put(dev, pipe); | |
1409 | ||
1410 | vblank->inmodeset = 0; | |
1411 | } | |
1412 | } | |
1413 | ||
b6dcaaac DV |
1414 | int drm_legacy_modeset_ctl_ioctl(struct drm_device *dev, void *data, |
1415 | struct drm_file *file_priv) | |
3ed4351a DV |
1416 | { |
1417 | struct drm_modeset_ctl *modeset = data; | |
1418 | unsigned int pipe; | |
1419 | ||
1420 | /* If drm_vblank_init() hasn't been called yet, just no-op */ | |
1421 | if (!dev->num_crtcs) | |
1422 | return 0; | |
1423 | ||
1424 | /* KMS drivers handle this internally */ | |
1425 | if (!drm_core_check_feature(dev, DRIVER_LEGACY)) | |
1426 | return 0; | |
1427 | ||
1428 | pipe = modeset->crtc; | |
1429 | if (pipe >= dev->num_crtcs) | |
1430 | return -EINVAL; | |
1431 | ||
1432 | switch (modeset->cmd) { | |
1433 | case _DRM_PRE_MODESET: | |
1434 | drm_legacy_vblank_pre_modeset(dev, pipe); | |
1435 | break; | |
1436 | case _DRM_POST_MODESET: | |
1437 | drm_legacy_vblank_post_modeset(dev, pipe); | |
1438 | break; | |
1439 | default: | |
1440 | return -EINVAL; | |
1441 | } | |
1442 | ||
1443 | return 0; | |
1444 | } | |
1445 | ||
570e8696 | 1446 | static inline bool vblank_passed(u64 seq, u64 ref) |
3ed4351a DV |
1447 | { |
1448 | return (seq - ref) <= (1 << 23); | |
1449 | } | |
1450 | ||
1451 | static int drm_queue_vblank_event(struct drm_device *dev, unsigned int pipe, | |
570e8696 | 1452 | u64 req_seq, |
3ed4351a DV |
1453 | union drm_wait_vblank *vblwait, |
1454 | struct drm_file *file_priv) | |
1455 | { | |
1456 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
1457 | struct drm_pending_vblank_event *e; | |
67680d3c | 1458 | ktime_t now; |
3ed4351a | 1459 | unsigned long flags; |
570e8696 | 1460 | u64 seq; |
3ed4351a DV |
1461 | int ret; |
1462 | ||
1463 | e = kzalloc(sizeof(*e), GFP_KERNEL); | |
1464 | if (e == NULL) { | |
1465 | ret = -ENOMEM; | |
1466 | goto err_put; | |
1467 | } | |
1468 | ||
1469 | e->pipe = pipe; | |
1470 | e->event.base.type = DRM_EVENT_VBLANK; | |
bd386e51 KP |
1471 | e->event.base.length = sizeof(e->event.vbl); |
1472 | e->event.vbl.user_data = vblwait->request.signal; | |
1473 | e->event.vbl.crtc_id = 0; | |
1474 | if (drm_core_check_feature(dev, DRIVER_MODESET)) { | |
1475 | struct drm_crtc *crtc = drm_crtc_from_index(dev, pipe); | |
1476 | if (crtc) | |
1477 | e->event.vbl.crtc_id = crtc->base.id; | |
1478 | } | |
3ed4351a DV |
1479 | |
1480 | spin_lock_irqsave(&dev->event_lock, flags); | |
1481 | ||
1482 | /* | |
1483 | * drm_crtc_vblank_off() might have been called after we called | |
1484 | * drm_vblank_get(). drm_crtc_vblank_off() holds event_lock around the | |
1485 | * vblank disable, so no need for further locking. The reference from | |
1486 | * drm_vblank_get() protects against vblank disable from another source. | |
1487 | */ | |
1488 | if (!READ_ONCE(vblank->enabled)) { | |
1489 | ret = -EINVAL; | |
1490 | goto err_unlock; | |
1491 | } | |
1492 | ||
1493 | ret = drm_event_reserve_init_locked(dev, file_priv, &e->base, | |
1494 | &e->event.base); | |
1495 | ||
1496 | if (ret) | |
1497 | goto err_unlock; | |
1498 | ||
1499 | seq = drm_vblank_count_and_time(dev, pipe, &now); | |
1500 | ||
570e8696 KP |
1501 | DRM_DEBUG("event on vblank count %llu, current %llu, crtc %u\n", |
1502 | req_seq, seq, pipe); | |
3ed4351a | 1503 | |
570e8696 | 1504 | trace_drm_vblank_event_queued(file_priv, pipe, req_seq); |
3ed4351a | 1505 | |
570e8696 KP |
1506 | e->sequence = req_seq; |
1507 | if (vblank_passed(seq, req_seq)) { | |
3ed4351a | 1508 | drm_vblank_put(dev, pipe); |
67680d3c | 1509 | send_vblank_event(dev, e, seq, now); |
3ed4351a DV |
1510 | vblwait->reply.sequence = seq; |
1511 | } else { | |
1512 | /* drm_handle_vblank_events will call drm_vblank_put */ | |
1513 | list_add_tail(&e->base.link, &dev->vblank_event_list); | |
570e8696 | 1514 | vblwait->reply.sequence = req_seq; |
3ed4351a DV |
1515 | } |
1516 | ||
1517 | spin_unlock_irqrestore(&dev->event_lock, flags); | |
1518 | ||
1519 | return 0; | |
1520 | ||
1521 | err_unlock: | |
1522 | spin_unlock_irqrestore(&dev->event_lock, flags); | |
1523 | kfree(e); | |
1524 | err_put: | |
1525 | drm_vblank_put(dev, pipe); | |
1526 | return ret; | |
1527 | } | |
1528 | ||
1529 | static bool drm_wait_vblank_is_query(union drm_wait_vblank *vblwait) | |
1530 | { | |
1531 | if (vblwait->request.sequence) | |
1532 | return false; | |
1533 | ||
1534 | return _DRM_VBLANK_RELATIVE == | |
1535 | (vblwait->request.type & (_DRM_VBLANK_TYPES_MASK | | |
1536 | _DRM_VBLANK_EVENT | | |
1537 | _DRM_VBLANK_NEXTONMISS)); | |
1538 | } | |
1539 | ||
570e8696 KP |
1540 | /* |
1541 | * Widen a 32-bit param to 64-bits. | |
1542 | * | |
1543 | * \param narrow 32-bit value (missing upper 32 bits) | |
1544 | * \param near 64-bit value that should be 'close' to near | |
1545 | * | |
1546 | * This function returns a 64-bit value using the lower 32-bits from | |
1547 | * 'narrow' and constructing the upper 32-bits so that the result is | |
1548 | * as close as possible to 'near'. | |
1549 | */ | |
1550 | ||
1551 | static u64 widen_32_to_64(u32 narrow, u64 near) | |
1552 | { | |
1553 | return near + (s32) (narrow - near); | |
1554 | } | |
1555 | ||
67680d3c AB |
1556 | static void drm_wait_vblank_reply(struct drm_device *dev, unsigned int pipe, |
1557 | struct drm_wait_vblank_reply *reply) | |
1558 | { | |
1559 | ktime_t now; | |
1560 | struct timespec64 ts; | |
1561 | ||
1562 | /* | |
1563 | * drm_wait_vblank_reply is a UAPI structure that uses 'long' | |
25e1a798 AB |
1564 | * to store the seconds. This is safe as we always use monotonic |
1565 | * timestamps since linux-4.15. | |
67680d3c AB |
1566 | */ |
1567 | reply->sequence = drm_vblank_count_and_time(dev, pipe, &now); | |
1568 | ts = ktime_to_timespec64(now); | |
1569 | reply->tval_sec = (u32)ts.tv_sec; | |
1570 | reply->tval_usec = ts.tv_nsec / 1000; | |
1571 | } | |
1572 | ||
b6dcaaac DV |
1573 | int drm_wait_vblank_ioctl(struct drm_device *dev, void *data, |
1574 | struct drm_file *file_priv) | |
3ed4351a | 1575 | { |
7de440db | 1576 | struct drm_crtc *crtc; |
3ed4351a DV |
1577 | struct drm_vblank_crtc *vblank; |
1578 | union drm_wait_vblank *vblwait = data; | |
1579 | int ret; | |
570e8696 | 1580 | u64 req_seq, seq; |
7de440db | 1581 | unsigned int pipe_index; |
570e8696 | 1582 | unsigned int flags, pipe, high_pipe; |
3ed4351a DV |
1583 | |
1584 | if (!dev->irq_enabled) | |
1585 | return -EINVAL; | |
1586 | ||
1587 | if (vblwait->request.type & _DRM_VBLANK_SIGNAL) | |
1588 | return -EINVAL; | |
1589 | ||
1590 | if (vblwait->request.type & | |
1591 | ~(_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK | | |
1592 | _DRM_VBLANK_HIGH_CRTC_MASK)) { | |
a9734d8e | 1593 | DRM_DEBUG("Unsupported type value 0x%x, supported mask 0x%x\n", |
3ed4351a DV |
1594 | vblwait->request.type, |
1595 | (_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK | | |
1596 | _DRM_VBLANK_HIGH_CRTC_MASK)); | |
1597 | return -EINVAL; | |
1598 | } | |
1599 | ||
1600 | flags = vblwait->request.type & _DRM_VBLANK_FLAGS_MASK; | |
1601 | high_pipe = (vblwait->request.type & _DRM_VBLANK_HIGH_CRTC_MASK); | |
1602 | if (high_pipe) | |
7de440db | 1603 | pipe_index = high_pipe >> _DRM_VBLANK_HIGH_CRTC_SHIFT; |
3ed4351a | 1604 | else |
7de440db KP |
1605 | pipe_index = flags & _DRM_VBLANK_SECONDARY ? 1 : 0; |
1606 | ||
1607 | /* Convert lease-relative crtc index into global crtc index */ | |
1608 | if (drm_core_check_feature(dev, DRIVER_MODESET)) { | |
1609 | pipe = 0; | |
1610 | drm_for_each_crtc(crtc, dev) { | |
1611 | if (drm_lease_held(file_priv, crtc->base.id)) { | |
1612 | if (pipe_index == 0) | |
1613 | break; | |
1614 | pipe_index--; | |
1615 | } | |
1616 | pipe++; | |
1617 | } | |
1618 | } else { | |
1619 | pipe = pipe_index; | |
1620 | } | |
1621 | ||
3ed4351a DV |
1622 | if (pipe >= dev->num_crtcs) |
1623 | return -EINVAL; | |
1624 | ||
1625 | vblank = &dev->vblank[pipe]; | |
1626 | ||
1627 | /* If the counter is currently enabled and accurate, short-circuit | |
1628 | * queries to return the cached timestamp of the last vblank. | |
1629 | */ | |
1630 | if (dev->vblank_disable_immediate && | |
1631 | drm_wait_vblank_is_query(vblwait) && | |
1632 | READ_ONCE(vblank->enabled)) { | |
67680d3c | 1633 | drm_wait_vblank_reply(dev, pipe, &vblwait->reply); |
3ed4351a DV |
1634 | return 0; |
1635 | } | |
1636 | ||
1637 | ret = drm_vblank_get(dev, pipe); | |
1638 | if (ret) { | |
1639 | DRM_DEBUG("crtc %d failed to acquire vblank counter, %d\n", pipe, ret); | |
1640 | return ret; | |
1641 | } | |
1642 | seq = drm_vblank_count(dev, pipe); | |
1643 | ||
1644 | switch (vblwait->request.type & _DRM_VBLANK_TYPES_MASK) { | |
1645 | case _DRM_VBLANK_RELATIVE: | |
570e8696 KP |
1646 | req_seq = seq + vblwait->request.sequence; |
1647 | vblwait->request.sequence = req_seq; | |
3ed4351a | 1648 | vblwait->request.type &= ~_DRM_VBLANK_RELATIVE; |
570e8696 | 1649 | break; |
3ed4351a | 1650 | case _DRM_VBLANK_ABSOLUTE: |
570e8696 | 1651 | req_seq = widen_32_to_64(vblwait->request.sequence, seq); |
3ed4351a DV |
1652 | break; |
1653 | default: | |
1654 | ret = -EINVAL; | |
1655 | goto done; | |
1656 | } | |
1657 | ||
1658 | if ((flags & _DRM_VBLANK_NEXTONMISS) && | |
570e8696 KP |
1659 | vblank_passed(seq, req_seq)) { |
1660 | req_seq = seq + 1; | |
1661 | vblwait->request.type &= ~_DRM_VBLANK_NEXTONMISS; | |
1662 | vblwait->request.sequence = req_seq; | |
1663 | } | |
3ed4351a DV |
1664 | |
1665 | if (flags & _DRM_VBLANK_EVENT) { | |
1666 | /* must hold on to the vblank ref until the event fires | |
1667 | * drm_vblank_put will be called asynchronously | |
1668 | */ | |
570e8696 | 1669 | return drm_queue_vblank_event(dev, pipe, req_seq, vblwait, file_priv); |
3ed4351a DV |
1670 | } |
1671 | ||
570e8696 KP |
1672 | if (req_seq != seq) { |
1673 | DRM_DEBUG("waiting on vblank count %llu, crtc %u\n", | |
1674 | req_seq, pipe); | |
3ed4351a DV |
1675 | DRM_WAIT_ON(ret, vblank->queue, 3 * HZ, |
1676 | vblank_passed(drm_vblank_count(dev, pipe), | |
570e8696 | 1677 | req_seq) || |
3ed4351a DV |
1678 | !READ_ONCE(vblank->enabled)); |
1679 | } | |
1680 | ||
1681 | if (ret != -EINTR) { | |
67680d3c | 1682 | drm_wait_vblank_reply(dev, pipe, &vblwait->reply); |
3ed4351a DV |
1683 | |
1684 | DRM_DEBUG("crtc %d returning %u to client\n", | |
1685 | pipe, vblwait->reply.sequence); | |
1686 | } else { | |
1687 | DRM_DEBUG("crtc %d vblank wait interrupted by signal\n", pipe); | |
1688 | } | |
1689 | ||
1690 | done: | |
1691 | drm_vblank_put(dev, pipe); | |
1692 | return ret; | |
1693 | } | |
1694 | ||
1695 | static void drm_handle_vblank_events(struct drm_device *dev, unsigned int pipe) | |
1696 | { | |
1697 | struct drm_pending_vblank_event *e, *t; | |
67680d3c | 1698 | ktime_t now; |
570e8696 | 1699 | u64 seq; |
3ed4351a DV |
1700 | |
1701 | assert_spin_locked(&dev->event_lock); | |
1702 | ||
1703 | seq = drm_vblank_count_and_time(dev, pipe, &now); | |
1704 | ||
1705 | list_for_each_entry_safe(e, t, &dev->vblank_event_list, base.link) { | |
1706 | if (e->pipe != pipe) | |
1707 | continue; | |
570e8696 | 1708 | if (!vblank_passed(seq, e->sequence)) |
3ed4351a DV |
1709 | continue; |
1710 | ||
570e8696 KP |
1711 | DRM_DEBUG("vblank event on %llu, current %llu\n", |
1712 | e->sequence, seq); | |
3ed4351a DV |
1713 | |
1714 | list_del(&e->base.link); | |
1715 | drm_vblank_put(dev, pipe); | |
67680d3c | 1716 | send_vblank_event(dev, e, seq, now); |
3ed4351a DV |
1717 | } |
1718 | ||
1719 | trace_drm_vblank_event(pipe, seq); | |
1720 | } | |
1721 | ||
1722 | /** | |
1723 | * drm_handle_vblank - handle a vblank event | |
1724 | * @dev: DRM device | |
1725 | * @pipe: index of CRTC where this event occurred | |
1726 | * | |
1727 | * Drivers should call this routine in their vblank interrupt handlers to | |
1728 | * update the vblank counter and send any signals that may be pending. | |
1729 | * | |
1730 | * This is the legacy version of drm_crtc_handle_vblank(). | |
1731 | */ | |
1732 | bool drm_handle_vblank(struct drm_device *dev, unsigned int pipe) | |
1733 | { | |
1734 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
1735 | unsigned long irqflags; | |
1736 | bool disable_irq; | |
1737 | ||
1738 | if (WARN_ON_ONCE(!dev->num_crtcs)) | |
1739 | return false; | |
1740 | ||
1741 | if (WARN_ON(pipe >= dev->num_crtcs)) | |
1742 | return false; | |
1743 | ||
1744 | spin_lock_irqsave(&dev->event_lock, irqflags); | |
1745 | ||
1746 | /* Need timestamp lock to prevent concurrent execution with | |
1747 | * vblank enable/disable, as this would cause inconsistent | |
1748 | * or corrupted timestamps and vblank counts. | |
1749 | */ | |
1750 | spin_lock(&dev->vblank_time_lock); | |
1751 | ||
1752 | /* Vblank irq handling disabled. Nothing to do. */ | |
1753 | if (!vblank->enabled) { | |
1754 | spin_unlock(&dev->vblank_time_lock); | |
1755 | spin_unlock_irqrestore(&dev->event_lock, irqflags); | |
1756 | return false; | |
1757 | } | |
1758 | ||
1759 | drm_update_vblank_count(dev, pipe, true); | |
1760 | ||
1761 | spin_unlock(&dev->vblank_time_lock); | |
1762 | ||
1763 | wake_up(&vblank->queue); | |
1764 | ||
1765 | /* With instant-off, we defer disabling the interrupt until after | |
1766 | * we finish processing the following vblank after all events have | |
1767 | * been signaled. The disable has to be last (after | |
1768 | * drm_handle_vblank_events) so that the timestamp is always accurate. | |
1769 | */ | |
1770 | disable_irq = (dev->vblank_disable_immediate && | |
1771 | drm_vblank_offdelay > 0 && | |
1772 | !atomic_read(&vblank->refcount)); | |
1773 | ||
1774 | drm_handle_vblank_events(dev, pipe); | |
1775 | ||
1776 | spin_unlock_irqrestore(&dev->event_lock, irqflags); | |
1777 | ||
1778 | if (disable_irq) | |
e99e88a9 | 1779 | vblank_disable_fn(&vblank->disable_timer); |
3ed4351a DV |
1780 | |
1781 | return true; | |
1782 | } | |
1783 | EXPORT_SYMBOL(drm_handle_vblank); | |
1784 | ||
1785 | /** | |
1786 | * drm_crtc_handle_vblank - handle a vblank event | |
1787 | * @crtc: where this event occurred | |
1788 | * | |
1789 | * Drivers should call this routine in their vblank interrupt handlers to | |
1790 | * update the vblank counter and send any signals that may be pending. | |
1791 | * | |
1792 | * This is the native KMS version of drm_handle_vblank(). | |
1793 | * | |
1794 | * Returns: | |
1795 | * True if the event was successfully handled, false on failure. | |
1796 | */ | |
1797 | bool drm_crtc_handle_vblank(struct drm_crtc *crtc) | |
1798 | { | |
1799 | return drm_handle_vblank(crtc->dev, drm_crtc_index(crtc)); | |
1800 | } | |
1801 | EXPORT_SYMBOL(drm_crtc_handle_vblank); | |
3064abfa KP |
1802 | |
1803 | /* | |
1804 | * Get crtc VBLANK count. | |
1805 | * | |
1806 | * \param dev DRM device | |
1807 | * \param data user arguement, pointing to a drm_crtc_get_sequence structure. | |
1808 | * \param file_priv drm file private for the user's open file descriptor | |
1809 | */ | |
1810 | ||
1811 | int drm_crtc_get_sequence_ioctl(struct drm_device *dev, void *data, | |
1812 | struct drm_file *file_priv) | |
1813 | { | |
1814 | struct drm_crtc *crtc; | |
1815 | struct drm_vblank_crtc *vblank; | |
1816 | int pipe; | |
1817 | struct drm_crtc_get_sequence *get_seq = data; | |
1818 | ktime_t now; | |
1819 | bool vblank_enabled; | |
1820 | int ret; | |
1821 | ||
1822 | if (!drm_core_check_feature(dev, DRIVER_MODESET)) | |
69fdf420 | 1823 | return -EOPNOTSUPP; |
3064abfa KP |
1824 | |
1825 | if (!dev->irq_enabled) | |
1826 | return -EINVAL; | |
1827 | ||
1828 | crtc = drm_crtc_find(dev, file_priv, get_seq->crtc_id); | |
1829 | if (!crtc) | |
1830 | return -ENOENT; | |
1831 | ||
1832 | pipe = drm_crtc_index(crtc); | |
1833 | ||
1834 | vblank = &dev->vblank[pipe]; | |
1835 | vblank_enabled = dev->vblank_disable_immediate && READ_ONCE(vblank->enabled); | |
1836 | ||
1837 | if (!vblank_enabled) { | |
1838 | ret = drm_crtc_vblank_get(crtc); | |
1839 | if (ret) { | |
1840 | DRM_DEBUG("crtc %d failed to acquire vblank counter, %d\n", pipe, ret); | |
1841 | return ret; | |
1842 | } | |
1843 | } | |
1844 | drm_modeset_lock(&crtc->mutex, NULL); | |
1845 | if (crtc->state) | |
1846 | get_seq->active = crtc->state->enable; | |
1847 | else | |
1848 | get_seq->active = crtc->enabled; | |
1849 | drm_modeset_unlock(&crtc->mutex); | |
1850 | get_seq->sequence = drm_vblank_count_and_time(dev, pipe, &now); | |
1851 | get_seq->sequence_ns = ktime_to_ns(now); | |
1852 | if (!vblank_enabled) | |
1853 | drm_crtc_vblank_put(crtc); | |
1854 | return 0; | |
1855 | } | |
1856 | ||
1857 | /* | |
1858 | * Queue a event for VBLANK sequence | |
1859 | * | |
1860 | * \param dev DRM device | |
1861 | * \param data user arguement, pointing to a drm_crtc_queue_sequence structure. | |
1862 | * \param file_priv drm file private for the user's open file descriptor | |
1863 | */ | |
1864 | ||
1865 | int drm_crtc_queue_sequence_ioctl(struct drm_device *dev, void *data, | |
1866 | struct drm_file *file_priv) | |
1867 | { | |
1868 | struct drm_crtc *crtc; | |
1869 | struct drm_vblank_crtc *vblank; | |
1870 | int pipe; | |
1871 | struct drm_crtc_queue_sequence *queue_seq = data; | |
1872 | ktime_t now; | |
1873 | struct drm_pending_vblank_event *e; | |
1874 | u32 flags; | |
1875 | u64 seq; | |
1876 | u64 req_seq; | |
1877 | int ret; | |
1878 | unsigned long spin_flags; | |
1879 | ||
1880 | if (!drm_core_check_feature(dev, DRIVER_MODESET)) | |
69fdf420 | 1881 | return -EOPNOTSUPP; |
3064abfa KP |
1882 | |
1883 | if (!dev->irq_enabled) | |
1884 | return -EINVAL; | |
1885 | ||
1886 | crtc = drm_crtc_find(dev, file_priv, queue_seq->crtc_id); | |
1887 | if (!crtc) | |
1888 | return -ENOENT; | |
1889 | ||
1890 | flags = queue_seq->flags; | |
1891 | /* Check valid flag bits */ | |
1892 | if (flags & ~(DRM_CRTC_SEQUENCE_RELATIVE| | |
1893 | DRM_CRTC_SEQUENCE_NEXT_ON_MISS)) | |
1894 | return -EINVAL; | |
1895 | ||
1896 | pipe = drm_crtc_index(crtc); | |
1897 | ||
1898 | vblank = &dev->vblank[pipe]; | |
1899 | ||
1900 | e = kzalloc(sizeof(*e), GFP_KERNEL); | |
1901 | if (e == NULL) | |
1902 | return -ENOMEM; | |
1903 | ||
1904 | ret = drm_crtc_vblank_get(crtc); | |
1905 | if (ret) { | |
1906 | DRM_DEBUG("crtc %d failed to acquire vblank counter, %d\n", pipe, ret); | |
1907 | goto err_free; | |
1908 | } | |
1909 | ||
1910 | seq = drm_vblank_count_and_time(dev, pipe, &now); | |
1911 | req_seq = queue_seq->sequence; | |
1912 | ||
1913 | if (flags & DRM_CRTC_SEQUENCE_RELATIVE) | |
1914 | req_seq += seq; | |
1915 | ||
1916 | if ((flags & DRM_CRTC_SEQUENCE_NEXT_ON_MISS) && vblank_passed(seq, req_seq)) | |
1917 | req_seq = seq + 1; | |
1918 | ||
1919 | e->pipe = pipe; | |
1920 | e->event.base.type = DRM_EVENT_CRTC_SEQUENCE; | |
1921 | e->event.base.length = sizeof(e->event.seq); | |
1922 | e->event.seq.user_data = queue_seq->user_data; | |
1923 | ||
1924 | spin_lock_irqsave(&dev->event_lock, spin_flags); | |
1925 | ||
1926 | /* | |
1927 | * drm_crtc_vblank_off() might have been called after we called | |
1928 | * drm_crtc_vblank_get(). drm_crtc_vblank_off() holds event_lock around the | |
1929 | * vblank disable, so no need for further locking. The reference from | |
1930 | * drm_crtc_vblank_get() protects against vblank disable from another source. | |
1931 | */ | |
1932 | if (!READ_ONCE(vblank->enabled)) { | |
1933 | ret = -EINVAL; | |
1934 | goto err_unlock; | |
1935 | } | |
1936 | ||
1937 | ret = drm_event_reserve_init_locked(dev, file_priv, &e->base, | |
1938 | &e->event.base); | |
1939 | ||
1940 | if (ret) | |
1941 | goto err_unlock; | |
1942 | ||
1943 | e->sequence = req_seq; | |
1944 | ||
1945 | if (vblank_passed(seq, req_seq)) { | |
1946 | drm_crtc_vblank_put(crtc); | |
1947 | send_vblank_event(dev, e, seq, now); | |
1948 | queue_seq->sequence = seq; | |
1949 | } else { | |
1950 | /* drm_handle_vblank_events will call drm_vblank_put */ | |
1951 | list_add_tail(&e->base.link, &dev->vblank_event_list); | |
1952 | queue_seq->sequence = req_seq; | |
1953 | } | |
1954 | ||
1955 | spin_unlock_irqrestore(&dev->event_lock, spin_flags); | |
1956 | return 0; | |
1957 | ||
1958 | err_unlock: | |
1959 | spin_unlock_irqrestore(&dev->event_lock, spin_flags); | |
1960 | drm_crtc_vblank_put(crtc); | |
1961 | err_free: | |
1962 | kfree(e); | |
1963 | return ret; | |
1964 | } |