File: | dev/pci/drm/drm_vblank.c |
Warning: | line 1914, column 3 Value stored to 'high_prec' is never read |
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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 | |
27 | #include <linux/export.h> |
28 | #include <linux/kthread.h> |
29 | #include <linux/moduleparam.h> |
30 | |
31 | #include <drm/drm_crtc.h> |
32 | #include <drm/drm_drv.h> |
33 | #include <drm/drm_framebuffer.h> |
34 | #include <drm/drm_managed.h> |
35 | #include <drm/drm_modeset_helper_vtables.h> |
36 | #include <drm/drm_print.h> |
37 | #include <drm/drm_vblank.h> |
38 | |
39 | #include "drm_internal.h" |
40 | #include "drm_trace.h" |
41 | |
42 | /** |
43 | * DOC: vblank handling |
44 | * |
45 | * From the computer's perspective, every time the monitor displays |
46 | * a new frame the scanout engine has "scanned out" the display image |
47 | * from top to bottom, one row of pixels at a time. The current row |
48 | * of pixels is referred to as the current scanline. |
49 | * |
50 | * In addition to the display's visible area, there's usually a couple of |
51 | * extra scanlines which aren't actually displayed on the screen. |
52 | * These extra scanlines don't contain image data and are occasionally used |
53 | * for features like audio and infoframes. The region made up of these |
54 | * scanlines is referred to as the vertical blanking region, or vblank for |
55 | * short. |
56 | * |
57 | * For historical reference, the vertical blanking period was designed to |
58 | * give the electron gun (on CRTs) enough time to move back to the top of |
59 | * the screen to start scanning out the next frame. Similar for horizontal |
60 | * blanking periods. They were designed to give the electron gun enough |
61 | * time to move back to the other side of the screen to start scanning the |
62 | * next scanline. |
63 | * |
64 | * :: |
65 | * |
66 | * |
67 | * physical → ⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽ |
68 | * top of | | |
69 | * display | | |
70 | * | New frame | |
71 | * | | |
72 | * |↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓| |
73 | * |~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~| ← Scanline, |
74 | * |↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓| updates the |
75 | * | | frame as it |
76 | * | | travels down |
77 | * | | ("sacn out") |
78 | * | Old frame | |
79 | * | | |
80 | * | | |
81 | * | | |
82 | * | | physical |
83 | * | | bottom of |
84 | * vertical |⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽| ← display |
85 | * blanking ┆xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx┆ |
86 | * region → ┆xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx┆ |
87 | * ┆xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx┆ |
88 | * start of → ⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽ |
89 | * new frame |
90 | * |
91 | * "Physical top of display" is the reference point for the high-precision/ |
92 | * corrected timestamp. |
93 | * |
94 | * On a lot of display hardware, programming needs to take effect during the |
95 | * vertical blanking period so that settings like gamma, the image buffer |
96 | * buffer to be scanned out, etc. can safely be changed without showing |
97 | * any visual artifacts on the screen. In some unforgiving hardware, some of |
98 | * this programming has to both start and end in the same vblank. To help |
99 | * with the timing of the hardware programming, an interrupt is usually |
100 | * available to notify the driver when it can start the updating of registers. |
101 | * The interrupt is in this context named the vblank interrupt. |
102 | * |
103 | * The vblank interrupt may be fired at different points depending on the |
104 | * hardware. Some hardware implementations will fire the interrupt when the |
105 | * new frame start, other implementations will fire the interrupt at different |
106 | * points in time. |
107 | * |
108 | * Vertical blanking plays a major role in graphics rendering. To achieve |
109 | * tear-free display, users must synchronize page flips and/or rendering to |
110 | * vertical blanking. The DRM API offers ioctls to perform page flips |
111 | * synchronized to vertical blanking and wait for vertical blanking. |
112 | * |
113 | * The DRM core handles most of the vertical blanking management logic, which |
114 | * involves filtering out spurious interrupts, keeping race-free blanking |
115 | * counters, coping with counter wrap-around and resets and keeping use counts. |
116 | * It relies on the driver to generate vertical blanking interrupts and |
117 | * optionally provide a hardware vertical blanking counter. |
118 | * |
119 | * Drivers must initialize the vertical blanking handling core with a call to |
120 | * drm_vblank_init(). Minimally, a driver needs to implement |
121 | * &drm_crtc_funcs.enable_vblank and &drm_crtc_funcs.disable_vblank plus call |
122 | * drm_crtc_handle_vblank() in its vblank interrupt handler for working vblank |
123 | * support. |
124 | * |
125 | * Vertical blanking interrupts can be enabled by the DRM core or by drivers |
126 | * themselves (for instance to handle page flipping operations). The DRM core |
127 | * maintains a vertical blanking use count to ensure that the interrupts are not |
128 | * disabled while a user still needs them. To increment the use count, drivers |
129 | * call drm_crtc_vblank_get() and release the vblank reference again with |
130 | * drm_crtc_vblank_put(). In between these two calls vblank interrupts are |
131 | * guaranteed to be enabled. |
132 | * |
133 | * On many hardware disabling the vblank interrupt cannot be done in a race-free |
134 | * manner, see &drm_driver.vblank_disable_immediate and |
135 | * &drm_driver.max_vblank_count. In that case the vblank core only disables the |
136 | * vblanks after a timer has expired, which can be configured through the |
137 | * ``vblankoffdelay`` module parameter. |
138 | * |
139 | * Drivers for hardware without support for vertical-blanking interrupts |
140 | * must not call drm_vblank_init(). For such drivers, atomic helpers will |
141 | * automatically generate fake vblank events as part of the display update. |
142 | * This functionality also can be controlled by the driver by enabling and |
143 | * disabling struct drm_crtc_state.no_vblank. |
144 | */ |
145 | |
146 | /* Retry timestamp calculation up to 3 times to satisfy |
147 | * drm_timestamp_precision before giving up. |
148 | */ |
149 | #define DRM_TIMESTAMP_MAXRETRIES3 3 |
150 | |
151 | /* Threshold in nanoseconds for detection of redundant |
152 | * vblank irq in drm_handle_vblank(). 1 msec should be ok. |
153 | */ |
154 | #define DRM_REDUNDANT_VBLIRQ_THRESH_NS1000000 1000000 |
155 | |
156 | static bool_Bool |
157 | drm_get_last_vbltimestamp(struct drm_device *dev, unsigned int pipe, |
158 | ktime_t *tvblank, bool_Bool in_vblank_irq); |
159 | |
160 | static unsigned int drm_timestamp_precision = 20; /* Default to 20 usecs. */ |
161 | |
162 | static int drm_vblank_offdelay = 5000; /* Default to 5000 msecs. */ |
163 | |
164 | module_param_named(vblankoffdelay, drm_vblank_offdelay, int, 0600); |
165 | module_param_named(timestamp_precision_usec, drm_timestamp_precision, int, 0600); |
166 | MODULE_PARM_DESC(vblankoffdelay, "Delay until vblank irq auto-disable [msecs] (0: never disable, <0: disable immediately)"); |
167 | MODULE_PARM_DESC(timestamp_precision_usec, "Max. error on timestamps [usecs]"); |
168 | |
169 | static void store_vblank(struct drm_device *dev, unsigned int pipe, |
170 | u32 vblank_count_inc, |
171 | ktime_t t_vblank, u32 last) |
172 | { |
173 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
174 | |
175 | assert_spin_locked(&dev->vblank_time_lock)do { if (((&dev->vblank_time_lock)->mtx_owner != ({ struct cpu_info *__ci; asm volatile("movq %%gs:%P1,%0" : "=r" (__ci) :"n" (__builtin_offsetof(struct cpu_info, ci_self))); __ci;})) && !(panicstr || db_active)) panic("mutex %p not held in %s" , (&dev->vblank_time_lock), __func__); } while (0); |
176 | |
177 | vblank->last = last; |
178 | |
179 | write_seqlock(&vblank->seqlock); |
180 | vblank->time = t_vblank; |
181 | atomic64_add(vblank_count_inc, &vblank->count)__sync_fetch_and_add_8(&vblank->count, vblank_count_inc ); |
182 | write_sequnlock(&vblank->seqlock); |
183 | } |
184 | |
185 | static u32 drm_max_vblank_count(struct drm_device *dev, unsigned int pipe) |
186 | { |
187 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
188 | |
189 | return vblank->max_vblank_count ?: dev->max_vblank_count; |
190 | } |
191 | |
192 | /* |
193 | * "No hw counter" fallback implementation of .get_vblank_counter() hook, |
194 | * if there is no useable hardware frame counter available. |
195 | */ |
196 | static u32 drm_vblank_no_hw_counter(struct drm_device *dev, unsigned int pipe) |
197 | { |
198 | drm_WARN_ON_ONCE(dev, drm_max_vblank_count(dev, pipe) != 0)({ static int __warned; int __ret = !!((drm_max_vblank_count( dev, pipe) != 0)); if (__ret && !__warned) { printf("%s %s: " "%s", dev_driver_string(((dev))->dev), "", "drm_WARN_ON_ONCE(" "drm_max_vblank_count(dev, pipe) != 0" ")"); __warned = 1; } __builtin_expect(!!(__ret), 0); }); |
199 | return 0; |
200 | } |
201 | |
202 | static u32 __get_vblank_counter(struct drm_device *dev, unsigned int pipe) |
203 | { |
204 | if (drm_core_check_feature(dev, DRIVER_MODESET)) { |
205 | struct drm_crtc *crtc = drm_crtc_from_index(dev, pipe); |
206 | |
207 | if (drm_WARN_ON(dev, !crtc)({ int __ret = !!((!crtc)); if (__ret) printf("%s %s: " "%s", dev_driver_string(((dev))->dev), "", "drm_WARN_ON(" "!crtc" ")"); __builtin_expect(!!(__ret), 0); })) |
208 | return 0; |
209 | |
210 | if (crtc->funcs->get_vblank_counter) |
211 | return crtc->funcs->get_vblank_counter(crtc); |
212 | } else if (dev->driver->get_vblank_counter) { |
213 | return dev->driver->get_vblank_counter(dev, pipe); |
214 | } |
215 | |
216 | return drm_vblank_no_hw_counter(dev, pipe); |
217 | } |
218 | |
219 | /* |
220 | * Reset the stored timestamp for the current vblank count to correspond |
221 | * to the last vblank occurred. |
222 | * |
223 | * Only to be called from drm_crtc_vblank_on(). |
224 | * |
225 | * Note: caller must hold &drm_device.vbl_lock since this reads & writes |
226 | * device vblank fields. |
227 | */ |
228 | static void drm_reset_vblank_timestamp(struct drm_device *dev, unsigned int pipe) |
229 | { |
230 | u32 cur_vblank; |
231 | bool_Bool rc; |
232 | ktime_t t_vblank; |
233 | int count = DRM_TIMESTAMP_MAXRETRIES3; |
234 | |
235 | spin_lock(&dev->vblank_time_lock)mtx_enter(&dev->vblank_time_lock); |
236 | |
237 | /* |
238 | * sample the current counter to avoid random jumps |
239 | * when drm_vblank_enable() applies the diff |
240 | */ |
241 | do { |
242 | cur_vblank = __get_vblank_counter(dev, pipe); |
243 | rc = drm_get_last_vbltimestamp(dev, pipe, &t_vblank, false0); |
244 | } while (cur_vblank != __get_vblank_counter(dev, pipe) && --count > 0); |
245 | |
246 | /* |
247 | * Only reinitialize corresponding vblank timestamp if high-precision query |
248 | * available and didn't fail. Otherwise reinitialize delayed at next vblank |
249 | * interrupt and assign 0 for now, to mark the vblanktimestamp as invalid. |
250 | */ |
251 | if (!rc) |
252 | t_vblank = 0; |
253 | |
254 | /* |
255 | * +1 to make sure user will never see the same |
256 | * vblank counter value before and after a modeset |
257 | */ |
258 | store_vblank(dev, pipe, 1, t_vblank, cur_vblank); |
259 | |
260 | spin_unlock(&dev->vblank_time_lock)mtx_leave(&dev->vblank_time_lock); |
261 | } |
262 | |
263 | /* |
264 | * Call back into the driver to update the appropriate vblank counter |
265 | * (specified by @pipe). Deal with wraparound, if it occurred, and |
266 | * update the last read value so we can deal with wraparound on the next |
267 | * call if necessary. |
268 | * |
269 | * Only necessary when going from off->on, to account for frames we |
270 | * didn't get an interrupt for. |
271 | * |
272 | * Note: caller must hold &drm_device.vbl_lock since this reads & writes |
273 | * device vblank fields. |
274 | */ |
275 | static void drm_update_vblank_count(struct drm_device *dev, unsigned int pipe, |
276 | bool_Bool in_vblank_irq) |
277 | { |
278 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
279 | u32 cur_vblank, diff; |
280 | bool_Bool rc; |
281 | ktime_t t_vblank; |
282 | int count = DRM_TIMESTAMP_MAXRETRIES3; |
283 | int framedur_ns = vblank->framedur_ns; |
284 | u32 max_vblank_count = drm_max_vblank_count(dev, pipe); |
285 | |
286 | /* |
287 | * Interrupts were disabled prior to this call, so deal with counter |
288 | * wrap if needed. |
289 | * NOTE! It's possible we lost a full dev->max_vblank_count + 1 events |
290 | * here if the register is small or we had vblank interrupts off for |
291 | * a long time. |
292 | * |
293 | * We repeat the hardware vblank counter & timestamp query until |
294 | * we get consistent results. This to prevent races between gpu |
295 | * updating its hardware counter while we are retrieving the |
296 | * corresponding vblank timestamp. |
297 | */ |
298 | do { |
299 | cur_vblank = __get_vblank_counter(dev, pipe); |
300 | rc = drm_get_last_vbltimestamp(dev, pipe, &t_vblank, in_vblank_irq); |
301 | } while (cur_vblank != __get_vblank_counter(dev, pipe) && --count > 0); |
302 | |
303 | if (max_vblank_count) { |
304 | /* trust the hw counter when it's around */ |
305 | diff = (cur_vblank - vblank->last) & max_vblank_count; |
306 | } else if (rc && framedur_ns) { |
307 | u64 diff_ns = ktime_to_ns(ktime_sub(t_vblank, vblank->time)); |
308 | |
309 | /* |
310 | * Figure out how many vblanks we've missed based |
311 | * on the difference in the timestamps and the |
312 | * frame/field duration. |
313 | */ |
314 | |
315 | drm_dbg_vbl(dev, "crtc %u: Calculating number of vblanks."drm_dev_dbg((dev)->dev, DRM_UT_VBL, "crtc %u: Calculating number of vblanks." " diff_ns = %lld, framedur_ns = %d)\n", pipe, (long long)diff_ns , framedur_ns) |
316 | " diff_ns = %lld, framedur_ns = %d)\n",drm_dev_dbg((dev)->dev, DRM_UT_VBL, "crtc %u: Calculating number of vblanks." " diff_ns = %lld, framedur_ns = %d)\n", pipe, (long long)diff_ns , framedur_ns) |
317 | pipe, (long long)diff_ns, framedur_ns)drm_dev_dbg((dev)->dev, DRM_UT_VBL, "crtc %u: Calculating number of vblanks." " diff_ns = %lld, framedur_ns = %d)\n", pipe, (long long)diff_ns , framedur_ns); |
318 | |
319 | diff = DIV_ROUND_CLOSEST_ULL(diff_ns, framedur_ns)(((diff_ns) + ((framedur_ns) / 2)) / (framedur_ns)); |
320 | |
321 | if (diff == 0 && in_vblank_irq) |
322 | drm_dbg_vbl(dev, "crtc %u: Redundant vblirq ignored\n",drm_dev_dbg((dev)->dev, DRM_UT_VBL, "crtc %u: Redundant vblirq ignored\n" , pipe) |
323 | pipe)drm_dev_dbg((dev)->dev, DRM_UT_VBL, "crtc %u: Redundant vblirq ignored\n" , pipe); |
324 | } else { |
325 | /* some kind of default for drivers w/o accurate vbl timestamping */ |
326 | diff = in_vblank_irq ? 1 : 0; |
327 | } |
328 | |
329 | /* |
330 | * Within a drm_vblank_pre_modeset - drm_vblank_post_modeset |
331 | * interval? If so then vblank irqs keep running and it will likely |
332 | * happen that the hardware vblank counter is not trustworthy as it |
333 | * might reset at some point in that interval and vblank timestamps |
334 | * are not trustworthy either in that interval. Iow. this can result |
335 | * in a bogus diff >> 1 which must be avoided as it would cause |
336 | * random large forward jumps of the software vblank counter. |
337 | */ |
338 | if (diff > 1 && (vblank->inmodeset & 0x2)) { |
339 | drm_dbg_vbl(dev,drm_dev_dbg((dev)->dev, DRM_UT_VBL, "clamping vblank bump to 1 on crtc %u: diffr=%u" " due to pre-modeset.\n", pipe, diff) |
340 | "clamping vblank bump to 1 on crtc %u: diffr=%u"drm_dev_dbg((dev)->dev, DRM_UT_VBL, "clamping vblank bump to 1 on crtc %u: diffr=%u" " due to pre-modeset.\n", pipe, diff) |
341 | " due to pre-modeset.\n", pipe, diff)drm_dev_dbg((dev)->dev, DRM_UT_VBL, "clamping vblank bump to 1 on crtc %u: diffr=%u" " due to pre-modeset.\n", pipe, diff); |
342 | diff = 1; |
343 | } |
344 | |
345 | drm_dbg_vbl(dev, "updating vblank count on crtc %u:"drm_dev_dbg((dev)->dev, DRM_UT_VBL, "updating vblank count on crtc %u:" " current=%llu, diff=%u, hw=%u hw_last=%u\n", pipe, (unsigned long long)({ typeof(*(&vblank->count)) __tmp = *(volatile typeof(*(&vblank->count)) *)&(*(&vblank->count )); membar_datadep_consumer(); __tmp; }), diff, cur_vblank, vblank ->last) |
346 | " current=%llu, diff=%u, hw=%u hw_last=%u\n",drm_dev_dbg((dev)->dev, DRM_UT_VBL, "updating vblank count on crtc %u:" " current=%llu, diff=%u, hw=%u hw_last=%u\n", pipe, (unsigned long long)({ typeof(*(&vblank->count)) __tmp = *(volatile typeof(*(&vblank->count)) *)&(*(&vblank->count )); membar_datadep_consumer(); __tmp; }), diff, cur_vblank, vblank ->last) |
347 | pipe, (unsigned long long)atomic64_read(&vblank->count),drm_dev_dbg((dev)->dev, DRM_UT_VBL, "updating vblank count on crtc %u:" " current=%llu, diff=%u, hw=%u hw_last=%u\n", pipe, (unsigned long long)({ typeof(*(&vblank->count)) __tmp = *(volatile typeof(*(&vblank->count)) *)&(*(&vblank->count )); membar_datadep_consumer(); __tmp; }), diff, cur_vblank, vblank ->last) |
348 | diff, cur_vblank, vblank->last)drm_dev_dbg((dev)->dev, DRM_UT_VBL, "updating vblank count on crtc %u:" " current=%llu, diff=%u, hw=%u hw_last=%u\n", pipe, (unsigned long long)({ typeof(*(&vblank->count)) __tmp = *(volatile typeof(*(&vblank->count)) *)&(*(&vblank->count )); membar_datadep_consumer(); __tmp; }), diff, cur_vblank, vblank ->last); |
349 | |
350 | if (diff == 0) { |
351 | drm_WARN_ON_ONCE(dev, cur_vblank != vblank->last)({ static int __warned; int __ret = !!((cur_vblank != vblank-> last)); if (__ret && !__warned) { printf("%s %s: " "%s" , dev_driver_string(((dev))->dev), "", "drm_WARN_ON_ONCE(" "cur_vblank != vblank->last" ")"); __warned = 1; } __builtin_expect (!!(__ret), 0); }); |
352 | return; |
353 | } |
354 | |
355 | /* |
356 | * Only reinitialize corresponding vblank timestamp if high-precision query |
357 | * available and didn't fail, or we were called from the vblank interrupt. |
358 | * Otherwise reinitialize delayed at next vblank interrupt and assign 0 |
359 | * for now, to mark the vblanktimestamp as invalid. |
360 | */ |
361 | if (!rc && !in_vblank_irq) |
362 | t_vblank = 0; |
363 | |
364 | store_vblank(dev, pipe, diff, t_vblank, cur_vblank); |
365 | } |
366 | |
367 | u64 drm_vblank_count(struct drm_device *dev, unsigned int pipe) |
368 | { |
369 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
370 | u64 count; |
371 | |
372 | if (drm_WARN_ON(dev, pipe >= dev->num_crtcs)({ int __ret = !!((pipe >= dev->num_crtcs)); if (__ret) printf("%s %s: " "%s", dev_driver_string(((dev))->dev), "" , "drm_WARN_ON(" "pipe >= dev->num_crtcs" ")"); __builtin_expect (!!(__ret), 0); })) |
373 | return 0; |
374 | |
375 | count = atomic64_read(&vblank->count)({ typeof(*(&vblank->count)) __tmp = *(volatile typeof (*(&vblank->count)) *)&(*(&vblank->count)); membar_datadep_consumer(); __tmp; }); |
376 | |
377 | /* |
378 | * This read barrier corresponds to the implicit write barrier of the |
379 | * write seqlock in store_vblank(). Note that this is the only place |
380 | * where we need an explicit barrier, since all other access goes |
381 | * through drm_vblank_count_and_time(), which already has the required |
382 | * read barrier curtesy of the read seqlock. |
383 | */ |
384 | smp_rmb()do { __asm volatile("" ::: "memory"); } while (0); |
385 | |
386 | return count; |
387 | } |
388 | |
389 | /** |
390 | * drm_crtc_accurate_vblank_count - retrieve the master vblank counter |
391 | * @crtc: which counter to retrieve |
392 | * |
393 | * This function is similar to drm_crtc_vblank_count() but this function |
394 | * interpolates to handle a race with vblank interrupts using the high precision |
395 | * timestamping support. |
396 | * |
397 | * This is mostly useful for hardware that can obtain the scanout position, but |
398 | * doesn't have a hardware frame counter. |
399 | */ |
400 | u64 drm_crtc_accurate_vblank_count(struct drm_crtc *crtc) |
401 | { |
402 | struct drm_device *dev = crtc->dev; |
403 | unsigned int pipe = drm_crtc_index(crtc); |
404 | u64 vblank; |
405 | unsigned long flags; |
406 | |
407 | drm_WARN_ONCE(dev, drm_debug_enabled(DRM_UT_VBL) &&({ static int __warned; int __ret = !!(drm_debug_enabled(DRM_UT_VBL ) && !crtc->funcs->get_vblank_timestamp); if (__ret && !__warned) { printf("%s %s: " "This function requires support for accurate vblank timestamps." , dev_driver_string((dev)->dev), ""); __warned = 1; } __builtin_expect (!!(__ret), 0); }) |
408 | !crtc->funcs->get_vblank_timestamp,({ static int __warned; int __ret = !!(drm_debug_enabled(DRM_UT_VBL ) && !crtc->funcs->get_vblank_timestamp); if (__ret && !__warned) { printf("%s %s: " "This function requires support for accurate vblank timestamps." , dev_driver_string((dev)->dev), ""); __warned = 1; } __builtin_expect (!!(__ret), 0); }) |
409 | "This function requires support for accurate vblank timestamps.")({ static int __warned; int __ret = !!(drm_debug_enabled(DRM_UT_VBL ) && !crtc->funcs->get_vblank_timestamp); if (__ret && !__warned) { printf("%s %s: " "This function requires support for accurate vblank timestamps." , dev_driver_string((dev)->dev), ""); __warned = 1; } __builtin_expect (!!(__ret), 0); }); |
410 | |
411 | spin_lock_irqsave(&dev->vblank_time_lock, flags)do { flags = 0; mtx_enter(&dev->vblank_time_lock); } while (0); |
412 | |
413 | drm_update_vblank_count(dev, pipe, false0); |
414 | vblank = drm_vblank_count(dev, pipe); |
415 | |
416 | spin_unlock_irqrestore(&dev->vblank_time_lock, flags)do { (void)(flags); mtx_leave(&dev->vblank_time_lock); } while (0); |
417 | |
418 | return vblank; |
419 | } |
420 | EXPORT_SYMBOL(drm_crtc_accurate_vblank_count); |
421 | |
422 | static void __disable_vblank(struct drm_device *dev, unsigned int pipe) |
423 | { |
424 | if (drm_core_check_feature(dev, DRIVER_MODESET)) { |
425 | struct drm_crtc *crtc = drm_crtc_from_index(dev, pipe); |
426 | |
427 | if (drm_WARN_ON(dev, !crtc)({ int __ret = !!((!crtc)); if (__ret) printf("%s %s: " "%s", dev_driver_string(((dev))->dev), "", "drm_WARN_ON(" "!crtc" ")"); __builtin_expect(!!(__ret), 0); })) |
428 | return; |
429 | |
430 | if (crtc->funcs->disable_vblank) |
431 | crtc->funcs->disable_vblank(crtc); |
432 | } else { |
433 | dev->driver->disable_vblank(dev, pipe); |
434 | } |
435 | } |
436 | |
437 | /* |
438 | * Disable vblank irq's on crtc, make sure that last vblank count |
439 | * of hardware and corresponding consistent software vblank counter |
440 | * are preserved, even if there are any spurious vblank irq's after |
441 | * disable. |
442 | */ |
443 | void drm_vblank_disable_and_save(struct drm_device *dev, unsigned int pipe) |
444 | { |
445 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
446 | unsigned long irqflags; |
447 | |
448 | assert_spin_locked(&dev->vbl_lock)do { if (((&dev->vbl_lock)->mtx_owner != ({struct cpu_info *__ci; asm volatile("movq %%gs:%P1,%0" : "=r" (__ci) :"n" (__builtin_offsetof (struct cpu_info, ci_self))); __ci;})) && !(panicstr || db_active)) panic("mutex %p not held in %s", (&dev->vbl_lock ), __func__); } while (0); |
449 | |
450 | /* Prevent vblank irq processing while disabling vblank irqs, |
451 | * so no updates of timestamps or count can happen after we've |
452 | * disabled. Needed to prevent races in case of delayed irq's. |
453 | */ |
454 | spin_lock_irqsave(&dev->vblank_time_lock, irqflags)do { irqflags = 0; mtx_enter(&dev->vblank_time_lock); } while (0); |
455 | |
456 | /* |
457 | * Update vblank count and disable vblank interrupts only if the |
458 | * interrupts were enabled. This avoids calling the ->disable_vblank() |
459 | * operation in atomic context with the hardware potentially runtime |
460 | * suspended. |
461 | */ |
462 | if (!vblank->enabled) |
463 | goto out; |
464 | |
465 | /* |
466 | * Update the count and timestamp to maintain the |
467 | * appearance that the counter has been ticking all along until |
468 | * this time. This makes the count account for the entire time |
469 | * between drm_crtc_vblank_on() and drm_crtc_vblank_off(). |
470 | */ |
471 | drm_update_vblank_count(dev, pipe, false0); |
472 | __disable_vblank(dev, pipe); |
473 | vblank->enabled = false0; |
474 | |
475 | out: |
476 | spin_unlock_irqrestore(&dev->vblank_time_lock, irqflags)do { (void)(irqflags); mtx_leave(&dev->vblank_time_lock ); } while (0); |
477 | } |
478 | |
479 | static void vblank_disable_fn(void *arg) |
480 | { |
481 | struct drm_vblank_crtc *vblank = arg; |
482 | struct drm_device *dev = vblank->dev; |
483 | unsigned int pipe = vblank->pipe; |
484 | unsigned long irqflags; |
485 | |
486 | spin_lock_irqsave(&dev->vbl_lock, irqflags)do { irqflags = 0; mtx_enter(&dev->vbl_lock); } while ( 0); |
487 | if (atomic_read(&vblank->refcount)({ typeof(*(&vblank->refcount)) __tmp = *(volatile typeof (*(&vblank->refcount)) *)&(*(&vblank->refcount )); membar_datadep_consumer(); __tmp; }) == 0 && vblank->enabled) { |
488 | drm_dbg_core(dev, "disabling vblank on crtc %u\n", pipe)drm_dev_dbg((dev)->dev, DRM_UT_CORE, "disabling vblank on crtc %u\n" , pipe); |
489 | drm_vblank_disable_and_save(dev, pipe); |
490 | } |
491 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags)do { (void)(irqflags); mtx_leave(&dev->vbl_lock); } while (0); |
492 | } |
493 | |
494 | static void drm_vblank_init_release(struct drm_device *dev, void *ptr) |
495 | { |
496 | struct drm_vblank_crtc *vblank = ptr; |
497 | |
498 | drm_WARN_ON(dev, READ_ONCE(vblank->enabled) &&({ int __ret = !!((({ typeof(vblank->enabled) __tmp = *(volatile typeof(vblank->enabled) *)&(vblank->enabled); membar_datadep_consumer (); __tmp; }) && drm_core_check_feature(dev, DRIVER_MODESET ))); if (__ret) printf("%s %s: " "%s", dev_driver_string(((dev ))->dev), "", "drm_WARN_ON(" "({ typeof(vblank->enabled) __tmp = *(volatile typeof(vblank->enabled) *)&(vblank->enabled); membar_datadep_consumer(); __tmp; }) && drm_core_check_feature(dev, DRIVER_MODESET)" ")"); __builtin_expect(!!(__ret), 0); }) |
499 | drm_core_check_feature(dev, DRIVER_MODESET))({ int __ret = !!((({ typeof(vblank->enabled) __tmp = *(volatile typeof(vblank->enabled) *)&(vblank->enabled); membar_datadep_consumer (); __tmp; }) && drm_core_check_feature(dev, DRIVER_MODESET ))); if (__ret) printf("%s %s: " "%s", dev_driver_string(((dev ))->dev), "", "drm_WARN_ON(" "({ typeof(vblank->enabled) __tmp = *(volatile typeof(vblank->enabled) *)&(vblank->enabled); membar_datadep_consumer(); __tmp; }) && drm_core_check_feature(dev, DRIVER_MODESET)" ")"); __builtin_expect(!!(__ret), 0); }); |
500 | |
501 | drm_vblank_destroy_worker(vblank); |
502 | del_timer_sync(&vblank->disable_timer)timeout_del_barrier((&vblank->disable_timer)); |
503 | } |
504 | |
505 | /** |
506 | * drm_vblank_init - initialize vblank support |
507 | * @dev: DRM device |
508 | * @num_crtcs: number of CRTCs supported by @dev |
509 | * |
510 | * This function initializes vblank support for @num_crtcs display pipelines. |
511 | * Cleanup is handled automatically through a cleanup function added with |
512 | * drmm_add_action_or_reset(). |
513 | * |
514 | * Returns: |
515 | * Zero on success or a negative error code on failure. |
516 | */ |
517 | int drm_vblank_init(struct drm_device *dev, unsigned int num_crtcs) |
518 | { |
519 | int ret; |
520 | unsigned int i; |
521 | |
522 | mtx_init(&dev->vbl_lock, IPL_TTY)do { (void)(((void *)0)); (void)(0); __mtx_init((&dev-> vbl_lock), ((((0x9)) > 0x0 && ((0x9)) < 0x9) ? 0x9 : ((0x9)))); } while (0); |
523 | mtx_init(&dev->vblank_time_lock, IPL_TTY)do { (void)(((void *)0)); (void)(0); __mtx_init((&dev-> vblank_time_lock), ((((0x9)) > 0x0 && ((0x9)) < 0x9) ? 0x9 : ((0x9)))); } while (0); |
524 | |
525 | dev->vblank = drmm_kcalloc(dev, num_crtcs, sizeof(*dev->vblank), GFP_KERNEL(0x0001 | 0x0004)); |
526 | if (!dev->vblank) |
527 | return -ENOMEM12; |
528 | |
529 | dev->num_crtcs = num_crtcs; |
530 | |
531 | for (i = 0; i < num_crtcs; i++) { |
532 | struct drm_vblank_crtc *vblank = &dev->vblank[i]; |
533 | |
534 | vblank->dev = dev; |
535 | vblank->pipe = i; |
536 | init_waitqueue_head(&vblank->queue); |
537 | #ifdef __linux__ |
538 | timer_setup(&vblank->disable_timer, vblank_disable_fn, 0); |
539 | #else |
540 | timeout_set(&vblank->disable_timer, vblank_disable_fn, vblank); |
541 | #endif |
542 | seqlock_init(&vblank->seqlock, IPL_TTY0x9); |
543 | |
544 | ret = drmm_add_action_or_reset(dev, drm_vblank_init_release, |
545 | vblank); |
546 | if (ret) |
547 | return ret; |
548 | |
549 | ret = drm_vblank_worker_init(vblank); |
550 | if (ret) |
551 | return ret; |
552 | } |
553 | |
554 | return 0; |
555 | } |
556 | EXPORT_SYMBOL(drm_vblank_init); |
557 | |
558 | /** |
559 | * drm_dev_has_vblank - test if vblanking has been initialized for |
560 | * a device |
561 | * @dev: the device |
562 | * |
563 | * Drivers may call this function to test if vblank support is |
564 | * initialized for a device. For most hardware this means that vblanking |
565 | * can also be enabled. |
566 | * |
567 | * Atomic helpers use this function to initialize |
568 | * &drm_crtc_state.no_vblank. See also drm_atomic_helper_check_modeset(). |
569 | * |
570 | * Returns: |
571 | * True if vblanking has been initialized for the given device, false |
572 | * otherwise. |
573 | */ |
574 | bool_Bool drm_dev_has_vblank(const struct drm_device *dev) |
575 | { |
576 | return dev->num_crtcs != 0; |
577 | } |
578 | EXPORT_SYMBOL(drm_dev_has_vblank); |
579 | |
580 | /** |
581 | * drm_crtc_vblank_waitqueue - get vblank waitqueue for the CRTC |
582 | * @crtc: which CRTC's vblank waitqueue to retrieve |
583 | * |
584 | * This function returns a pointer to the vblank waitqueue for the CRTC. |
585 | * Drivers can use this to implement vblank waits using wait_event() and related |
586 | * functions. |
587 | */ |
588 | wait_queue_head_t *drm_crtc_vblank_waitqueue(struct drm_crtc *crtc) |
589 | { |
590 | return &crtc->dev->vblank[drm_crtc_index(crtc)].queue; |
591 | } |
592 | EXPORT_SYMBOL(drm_crtc_vblank_waitqueue); |
593 | |
594 | |
595 | /** |
596 | * drm_calc_timestamping_constants - calculate vblank timestamp constants |
597 | * @crtc: drm_crtc whose timestamp constants should be updated. |
598 | * @mode: display mode containing the scanout timings |
599 | * |
600 | * Calculate and store various constants which are later needed by vblank and |
601 | * swap-completion timestamping, e.g, by |
602 | * drm_crtc_vblank_helper_get_vblank_timestamp(). They are derived from |
603 | * CRTC's true scanout timing, so they take things like panel scaling or |
604 | * other adjustments into account. |
605 | */ |
606 | void drm_calc_timestamping_constants(struct drm_crtc *crtc, |
607 | const struct drm_display_mode *mode) |
608 | { |
609 | struct drm_device *dev = crtc->dev; |
610 | unsigned int pipe = drm_crtc_index(crtc); |
611 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
612 | int linedur_ns = 0, framedur_ns = 0; |
613 | int dotclock = mode->crtc_clock; |
614 | |
615 | if (!drm_dev_has_vblank(dev)) |
616 | return; |
617 | |
618 | if (drm_WARN_ON(dev, pipe >= dev->num_crtcs)({ int __ret = !!((pipe >= dev->num_crtcs)); if (__ret) printf("%s %s: " "%s", dev_driver_string(((dev))->dev), "" , "drm_WARN_ON(" "pipe >= dev->num_crtcs" ")"); __builtin_expect (!!(__ret), 0); })) |
619 | return; |
620 | |
621 | /* Valid dotclock? */ |
622 | if (dotclock > 0) { |
623 | int frame_size = mode->crtc_htotal * mode->crtc_vtotal; |
624 | |
625 | /* |
626 | * Convert scanline length in pixels and video |
627 | * dot clock to line duration and frame duration |
628 | * in nanoseconds: |
629 | */ |
630 | linedur_ns = div_u64((u64) mode->crtc_htotal * 1000000, dotclock); |
631 | framedur_ns = div_u64((u64) frame_size * 1000000, dotclock); |
632 | |
633 | /* |
634 | * Fields of interlaced scanout modes are only half a frame duration. |
635 | */ |
636 | if (mode->flags & DRM_MODE_FLAG_INTERLACE(1<<4)) |
637 | framedur_ns /= 2; |
638 | } else { |
639 | drm_err(dev, "crtc %u: Can't calculate constants, dotclock = 0!\n",printf("drm:pid%d:%s *ERROR* " "[drm] " "*ERROR* " "crtc %u: Can't calculate constants, dotclock = 0!\n" , ({struct cpu_info *__ci; asm volatile("movq %%gs:%P1,%0" : "=r" (__ci) :"n" (__builtin_offsetof(struct cpu_info, ci_self))); __ci;})->ci_curproc->p_p->ps_pid, __func__ , crtc-> base.id) |
640 | crtc->base.id)printf("drm:pid%d:%s *ERROR* " "[drm] " "*ERROR* " "crtc %u: Can't calculate constants, dotclock = 0!\n" , ({struct cpu_info *__ci; asm volatile("movq %%gs:%P1,%0" : "=r" (__ci) :"n" (__builtin_offsetof(struct cpu_info, ci_self))); __ci;})->ci_curproc->p_p->ps_pid, __func__ , crtc-> base.id); |
641 | } |
642 | |
643 | vblank->linedur_ns = linedur_ns; |
644 | vblank->framedur_ns = framedur_ns; |
645 | vblank->hwmode = *mode; |
646 | |
647 | drm_dbg_core(dev,drm_dev_dbg((dev)->dev, DRM_UT_CORE, "crtc %u: hwmode: htotal %d, vtotal %d, vdisplay %d\n" , crtc->base.id, mode->crtc_htotal, mode->crtc_vtotal , mode->crtc_vdisplay) |
648 | "crtc %u: hwmode: htotal %d, vtotal %d, vdisplay %d\n",drm_dev_dbg((dev)->dev, DRM_UT_CORE, "crtc %u: hwmode: htotal %d, vtotal %d, vdisplay %d\n" , crtc->base.id, mode->crtc_htotal, mode->crtc_vtotal , mode->crtc_vdisplay) |
649 | crtc->base.id, mode->crtc_htotal,drm_dev_dbg((dev)->dev, DRM_UT_CORE, "crtc %u: hwmode: htotal %d, vtotal %d, vdisplay %d\n" , crtc->base.id, mode->crtc_htotal, mode->crtc_vtotal , mode->crtc_vdisplay) |
650 | mode->crtc_vtotal, mode->crtc_vdisplay)drm_dev_dbg((dev)->dev, DRM_UT_CORE, "crtc %u: hwmode: htotal %d, vtotal %d, vdisplay %d\n" , crtc->base.id, mode->crtc_htotal, mode->crtc_vtotal , mode->crtc_vdisplay); |
651 | drm_dbg_core(dev, "crtc %u: clock %d kHz framedur %d linedur %d\n",drm_dev_dbg((dev)->dev, DRM_UT_CORE, "crtc %u: clock %d kHz framedur %d linedur %d\n" , crtc->base.id, dotclock, framedur_ns, linedur_ns) |
652 | crtc->base.id, dotclock, framedur_ns, linedur_ns)drm_dev_dbg((dev)->dev, DRM_UT_CORE, "crtc %u: clock %d kHz framedur %d linedur %d\n" , crtc->base.id, dotclock, framedur_ns, linedur_ns); |
653 | } |
654 | EXPORT_SYMBOL(drm_calc_timestamping_constants); |
655 | |
656 | /** |
657 | * drm_crtc_vblank_helper_get_vblank_timestamp_internal - precise vblank |
658 | * timestamp helper |
659 | * @crtc: CRTC whose vblank timestamp to retrieve |
660 | * @max_error: Desired maximum allowable error in timestamps (nanosecs) |
661 | * On return contains true maximum error of timestamp |
662 | * @vblank_time: Pointer to time which should receive the timestamp |
663 | * @in_vblank_irq: |
664 | * True when called from drm_crtc_handle_vblank(). Some drivers |
665 | * need to apply some workarounds for gpu-specific vblank irq quirks |
666 | * if flag is set. |
667 | * @get_scanout_position: |
668 | * Callback function to retrieve the scanout position. See |
669 | * @struct drm_crtc_helper_funcs.get_scanout_position. |
670 | * |
671 | * Implements calculation of exact vblank timestamps from given drm_display_mode |
672 | * timings and current video scanout position of a CRTC. |
673 | * |
674 | * The current implementation only handles standard video modes. For double scan |
675 | * and interlaced modes the driver is supposed to adjust the hardware mode |
676 | * (taken from &drm_crtc_state.adjusted mode for atomic modeset drivers) to |
677 | * match the scanout position reported. |
678 | * |
679 | * Note that atomic drivers must call drm_calc_timestamping_constants() before |
680 | * enabling a CRTC. The atomic helpers already take care of that in |
681 | * drm_atomic_helper_calc_timestamping_constants(). |
682 | * |
683 | * Returns: |
684 | * |
685 | * Returns true on success, and false on failure, i.e. when no accurate |
686 | * timestamp could be acquired. |
687 | */ |
688 | bool_Bool |
689 | drm_crtc_vblank_helper_get_vblank_timestamp_internal( |
690 | struct drm_crtc *crtc, int *max_error, ktime_t *vblank_time, |
691 | bool_Bool in_vblank_irq, |
692 | drm_vblank_get_scanout_position_func get_scanout_position) |
693 | { |
694 | struct drm_device *dev = crtc->dev; |
695 | unsigned int pipe = crtc->index; |
696 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
697 | struct timespec64 ts_etime, ts_vblank_time; |
698 | ktime_t stime, etime; |
699 | bool_Bool vbl_status; |
700 | const struct drm_display_mode *mode; |
701 | int vpos, hpos, i; |
702 | int delta_ns, duration_ns; |
703 | |
704 | if (pipe >= dev->num_crtcs) { |
705 | drm_err(dev, "Invalid crtc %u\n", pipe)printf("drm:pid%d:%s *ERROR* " "[drm] " "*ERROR* " "Invalid crtc %u\n" , ({struct cpu_info *__ci; asm volatile("movq %%gs:%P1,%0" : "=r" (__ci) :"n" (__builtin_offsetof(struct cpu_info, ci_self))); __ci;})->ci_curproc->p_p->ps_pid, __func__ , pipe); |
706 | return false0; |
707 | } |
708 | |
709 | /* Scanout position query not supported? Should not happen. */ |
710 | if (!get_scanout_position) { |
711 | drm_err(dev, "Called from CRTC w/o get_scanout_position()!?\n")printf("drm:pid%d:%s *ERROR* " "[drm] " "*ERROR* " "Called from CRTC w/o get_scanout_position()!?\n" , ({struct cpu_info *__ci; asm volatile("movq %%gs:%P1,%0" : "=r" (__ci) :"n" (__builtin_offsetof(struct cpu_info, ci_self))); __ci;})->ci_curproc->p_p->ps_pid, __func__); |
712 | return false0; |
713 | } |
714 | |
715 | if (drm_drv_uses_atomic_modeset(dev)) |
716 | mode = &vblank->hwmode; |
717 | else |
718 | mode = &crtc->hwmode; |
719 | |
720 | /* If mode timing undefined, just return as no-op: |
721 | * Happens during initial modesetting of a crtc. |
722 | */ |
723 | if (mode->crtc_clock == 0) { |
724 | drm_dbg_core(dev, "crtc %u: Noop due to uninitialized mode.\n",drm_dev_dbg((dev)->dev, DRM_UT_CORE, "crtc %u: Noop due to uninitialized mode.\n" , pipe) |
725 | pipe)drm_dev_dbg((dev)->dev, DRM_UT_CORE, "crtc %u: Noop due to uninitialized mode.\n" , pipe); |
726 | drm_WARN_ON_ONCE(dev, drm_drv_uses_atomic_modeset(dev))({ static int __warned; int __ret = !!((drm_drv_uses_atomic_modeset (dev))); if (__ret && !__warned) { printf("%s %s: " "%s" , dev_driver_string(((dev))->dev), "", "drm_WARN_ON_ONCE(" "drm_drv_uses_atomic_modeset(dev)" ")"); __warned = 1; } __builtin_expect (!!(__ret), 0); }); |
727 | return false0; |
728 | } |
729 | |
730 | /* Get current scanout position with system timestamp. |
731 | * Repeat query up to DRM_TIMESTAMP_MAXRETRIES times |
732 | * if single query takes longer than max_error nanoseconds. |
733 | * |
734 | * This guarantees a tight bound on maximum error if |
735 | * code gets preempted or delayed for some reason. |
736 | */ |
737 | for (i = 0; i < DRM_TIMESTAMP_MAXRETRIES3; i++) { |
738 | /* |
739 | * Get vertical and horizontal scanout position vpos, hpos, |
740 | * and bounding timestamps stime, etime, pre/post query. |
741 | */ |
742 | vbl_status = get_scanout_position(crtc, in_vblank_irq, |
743 | &vpos, &hpos, |
744 | &stime, &etime, |
745 | mode); |
746 | |
747 | /* Return as no-op if scanout query unsupported or failed. */ |
748 | if (!vbl_status) { |
749 | drm_dbg_core(dev,drm_dev_dbg((dev)->dev, DRM_UT_CORE, "crtc %u : scanoutpos query failed.\n" , pipe) |
750 | "crtc %u : scanoutpos query failed.\n",drm_dev_dbg((dev)->dev, DRM_UT_CORE, "crtc %u : scanoutpos query failed.\n" , pipe) |
751 | pipe)drm_dev_dbg((dev)->dev, DRM_UT_CORE, "crtc %u : scanoutpos query failed.\n" , pipe); |
752 | return false0; |
753 | } |
754 | |
755 | /* Compute uncertainty in timestamp of scanout position query. */ |
756 | duration_ns = ktime_to_ns(etime) - ktime_to_ns(stime); |
757 | |
758 | /* Accept result with < max_error nsecs timing uncertainty. */ |
759 | if (duration_ns <= *max_error) |
760 | break; |
761 | } |
762 | |
763 | /* Noisy system timing? */ |
764 | if (i == DRM_TIMESTAMP_MAXRETRIES3) { |
765 | drm_dbg_core(dev,drm_dev_dbg((dev)->dev, DRM_UT_CORE, "crtc %u: Noisy timestamp %d us > %d us [%d reps].\n" , pipe, duration_ns / 1000, *max_error / 1000, i) |
766 | "crtc %u: Noisy timestamp %d us > %d us [%d reps].\n",drm_dev_dbg((dev)->dev, DRM_UT_CORE, "crtc %u: Noisy timestamp %d us > %d us [%d reps].\n" , pipe, duration_ns / 1000, *max_error / 1000, i) |
767 | pipe, duration_ns / 1000, *max_error / 1000, i)drm_dev_dbg((dev)->dev, DRM_UT_CORE, "crtc %u: Noisy timestamp %d us > %d us [%d reps].\n" , pipe, duration_ns / 1000, *max_error / 1000, i); |
768 | } |
769 | |
770 | /* Return upper bound of timestamp precision error. */ |
771 | *max_error = duration_ns; |
772 | |
773 | /* Convert scanout position into elapsed time at raw_time query |
774 | * since start of scanout at first display scanline. delta_ns |
775 | * can be negative if start of scanout hasn't happened yet. |
776 | */ |
777 | delta_ns = div_s64(1000000LL * (vpos * mode->crtc_htotal + hpos), |
778 | mode->crtc_clock); |
779 | |
780 | /* Subtract time delta from raw timestamp to get final |
781 | * vblank_time timestamp for end of vblank. |
782 | */ |
783 | *vblank_time = ktime_sub_ns(etime, delta_ns); |
784 | |
785 | if (!drm_debug_enabled(DRM_UT_VBL)) |
786 | return true1; |
787 | |
788 | ts_etime = ktime_to_timespec64(etime); |
789 | ts_vblank_time = ktime_to_timespec64(*vblank_time); |
790 | |
791 | drm_dbg_vbl(dev,drm_dev_dbg((dev)->dev, DRM_UT_VBL, "crtc %u : v p(%d,%d)@ %lld.%06ld -> %lld.%06ld [e %d us, %d rep]\n" , pipe, hpos, vpos, (u64)ts_etime.tv_sec, ts_etime.tv_nsec / 1000 , (u64)ts_vblank_time.tv_sec, ts_vblank_time.tv_nsec / 1000, duration_ns / 1000, i) |
792 | "crtc %u : v p(%d,%d)@ %lld.%06ld -> %lld.%06ld [e %d us, %d rep]\n",drm_dev_dbg((dev)->dev, DRM_UT_VBL, "crtc %u : v p(%d,%d)@ %lld.%06ld -> %lld.%06ld [e %d us, %d rep]\n" , pipe, hpos, vpos, (u64)ts_etime.tv_sec, ts_etime.tv_nsec / 1000 , (u64)ts_vblank_time.tv_sec, ts_vblank_time.tv_nsec / 1000, duration_ns / 1000, i) |
793 | pipe, hpos, vpos,drm_dev_dbg((dev)->dev, DRM_UT_VBL, "crtc %u : v p(%d,%d)@ %lld.%06ld -> %lld.%06ld [e %d us, %d rep]\n" , pipe, hpos, vpos, (u64)ts_etime.tv_sec, ts_etime.tv_nsec / 1000 , (u64)ts_vblank_time.tv_sec, ts_vblank_time.tv_nsec / 1000, duration_ns / 1000, i) |
794 | (u64)ts_etime.tv_sec, ts_etime.tv_nsec / 1000,drm_dev_dbg((dev)->dev, DRM_UT_VBL, "crtc %u : v p(%d,%d)@ %lld.%06ld -> %lld.%06ld [e %d us, %d rep]\n" , pipe, hpos, vpos, (u64)ts_etime.tv_sec, ts_etime.tv_nsec / 1000 , (u64)ts_vblank_time.tv_sec, ts_vblank_time.tv_nsec / 1000, duration_ns / 1000, i) |
795 | (u64)ts_vblank_time.tv_sec, ts_vblank_time.tv_nsec / 1000,drm_dev_dbg((dev)->dev, DRM_UT_VBL, "crtc %u : v p(%d,%d)@ %lld.%06ld -> %lld.%06ld [e %d us, %d rep]\n" , pipe, hpos, vpos, (u64)ts_etime.tv_sec, ts_etime.tv_nsec / 1000 , (u64)ts_vblank_time.tv_sec, ts_vblank_time.tv_nsec / 1000, duration_ns / 1000, i) |
796 | duration_ns / 1000, i)drm_dev_dbg((dev)->dev, DRM_UT_VBL, "crtc %u : v p(%d,%d)@ %lld.%06ld -> %lld.%06ld [e %d us, %d rep]\n" , pipe, hpos, vpos, (u64)ts_etime.tv_sec, ts_etime.tv_nsec / 1000 , (u64)ts_vblank_time.tv_sec, ts_vblank_time.tv_nsec / 1000, duration_ns / 1000, i); |
797 | |
798 | return true1; |
799 | } |
800 | EXPORT_SYMBOL(drm_crtc_vblank_helper_get_vblank_timestamp_internal); |
801 | |
802 | /** |
803 | * drm_crtc_vblank_helper_get_vblank_timestamp - precise vblank timestamp |
804 | * helper |
805 | * @crtc: CRTC whose vblank timestamp to retrieve |
806 | * @max_error: Desired maximum allowable error in timestamps (nanosecs) |
807 | * On return contains true maximum error of timestamp |
808 | * @vblank_time: Pointer to time which should receive the timestamp |
809 | * @in_vblank_irq: |
810 | * True when called from drm_crtc_handle_vblank(). Some drivers |
811 | * need to apply some workarounds for gpu-specific vblank irq quirks |
812 | * if flag is set. |
813 | * |
814 | * Implements calculation of exact vblank timestamps from given drm_display_mode |
815 | * timings and current video scanout position of a CRTC. This can be directly |
816 | * used as the &drm_crtc_funcs.get_vblank_timestamp implementation of a kms |
817 | * driver if &drm_crtc_helper_funcs.get_scanout_position is implemented. |
818 | * |
819 | * The current implementation only handles standard video modes. For double scan |
820 | * and interlaced modes the driver is supposed to adjust the hardware mode |
821 | * (taken from &drm_crtc_state.adjusted mode for atomic modeset drivers) to |
822 | * match the scanout position reported. |
823 | * |
824 | * Note that atomic drivers must call drm_calc_timestamping_constants() before |
825 | * enabling a CRTC. The atomic helpers already take care of that in |
826 | * drm_atomic_helper_calc_timestamping_constants(). |
827 | * |
828 | * Returns: |
829 | * |
830 | * Returns true on success, and false on failure, i.e. when no accurate |
831 | * timestamp could be acquired. |
832 | */ |
833 | bool_Bool drm_crtc_vblank_helper_get_vblank_timestamp(struct drm_crtc *crtc, |
834 | int *max_error, |
835 | ktime_t *vblank_time, |
836 | bool_Bool in_vblank_irq) |
837 | { |
838 | return drm_crtc_vblank_helper_get_vblank_timestamp_internal( |
839 | crtc, max_error, vblank_time, in_vblank_irq, |
840 | crtc->helper_private->get_scanout_position); |
841 | } |
842 | EXPORT_SYMBOL(drm_crtc_vblank_helper_get_vblank_timestamp); |
843 | |
844 | /** |
845 | * drm_get_last_vbltimestamp - retrieve raw timestamp for the most recent |
846 | * vblank interval |
847 | * @dev: DRM device |
848 | * @pipe: index of CRTC whose vblank timestamp to retrieve |
849 | * @tvblank: Pointer to target time which should receive the timestamp |
850 | * @in_vblank_irq: |
851 | * True when called from drm_crtc_handle_vblank(). Some drivers |
852 | * need to apply some workarounds for gpu-specific vblank irq quirks |
853 | * if flag is set. |
854 | * |
855 | * Fetches the system timestamp corresponding to the time of the most recent |
856 | * vblank interval on specified CRTC. May call into kms-driver to |
857 | * compute the timestamp with a high-precision GPU specific method. |
858 | * |
859 | * Returns zero if timestamp originates from uncorrected do_gettimeofday() |
860 | * call, i.e., it isn't very precisely locked to the true vblank. |
861 | * |
862 | * Returns: |
863 | * True if timestamp is considered to be very precise, false otherwise. |
864 | */ |
865 | static bool_Bool |
866 | drm_get_last_vbltimestamp(struct drm_device *dev, unsigned int pipe, |
867 | ktime_t *tvblank, bool_Bool in_vblank_irq) |
868 | { |
869 | struct drm_crtc *crtc = drm_crtc_from_index(dev, pipe); |
870 | bool_Bool ret = false0; |
871 | |
872 | /* Define requested maximum error on timestamps (nanoseconds). */ |
873 | int max_error = (int) drm_timestamp_precision * 1000; |
874 | |
875 | /* Query driver if possible and precision timestamping enabled. */ |
876 | if (crtc && crtc->funcs->get_vblank_timestamp && max_error > 0) { |
877 | struct drm_crtc *crtc = drm_crtc_from_index(dev, pipe); |
878 | |
879 | ret = crtc->funcs->get_vblank_timestamp(crtc, &max_error, |
880 | tvblank, in_vblank_irq); |
881 | } |
882 | |
883 | /* GPU high precision timestamp query unsupported or failed. |
884 | * Return current monotonic/gettimeofday timestamp as best estimate. |
885 | */ |
886 | if (!ret) |
887 | *tvblank = ktime_get(); |
888 | |
889 | return ret; |
890 | } |
891 | |
892 | /** |
893 | * drm_crtc_vblank_count - retrieve "cooked" vblank counter value |
894 | * @crtc: which counter to retrieve |
895 | * |
896 | * Fetches the "cooked" vblank count value that represents the number of |
897 | * vblank events since the system was booted, including lost events due to |
898 | * modesetting activity. Note that this timer isn't correct against a racing |
899 | * vblank interrupt (since it only reports the software vblank counter), see |
900 | * drm_crtc_accurate_vblank_count() for such use-cases. |
901 | * |
902 | * Note that for a given vblank counter value drm_crtc_handle_vblank() |
903 | * and drm_crtc_vblank_count() or drm_crtc_vblank_count_and_time() |
904 | * provide a barrier: Any writes done before calling |
905 | * drm_crtc_handle_vblank() will be visible to callers of the later |
906 | * functions, iff the vblank count is the same or a later one. |
907 | * |
908 | * See also &drm_vblank_crtc.count. |
909 | * |
910 | * Returns: |
911 | * The software vblank counter. |
912 | */ |
913 | u64 drm_crtc_vblank_count(struct drm_crtc *crtc) |
914 | { |
915 | return drm_vblank_count(crtc->dev, drm_crtc_index(crtc)); |
916 | } |
917 | EXPORT_SYMBOL(drm_crtc_vblank_count); |
918 | |
919 | /** |
920 | * drm_vblank_count_and_time - retrieve "cooked" vblank counter value and the |
921 | * system timestamp corresponding to that vblank counter value. |
922 | * @dev: DRM device |
923 | * @pipe: index of CRTC whose counter to retrieve |
924 | * @vblanktime: Pointer to ktime_t to receive the vblank timestamp. |
925 | * |
926 | * Fetches the "cooked" vblank count value that represents the number of |
927 | * vblank events since the system was booted, including lost events due to |
928 | * modesetting activity. Returns corresponding system timestamp of the time |
929 | * of the vblank interval that corresponds to the current vblank counter value. |
930 | * |
931 | * This is the legacy version of drm_crtc_vblank_count_and_time(). |
932 | */ |
933 | static u64 drm_vblank_count_and_time(struct drm_device *dev, unsigned int pipe, |
934 | ktime_t *vblanktime) |
935 | { |
936 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
937 | u64 vblank_count; |
938 | unsigned int seq; |
939 | |
940 | if (drm_WARN_ON(dev, pipe >= dev->num_crtcs)({ int __ret = !!((pipe >= dev->num_crtcs)); if (__ret) printf("%s %s: " "%s", dev_driver_string(((dev))->dev), "" , "drm_WARN_ON(" "pipe >= dev->num_crtcs" ")"); __builtin_expect (!!(__ret), 0); })) { |
941 | *vblanktime = 0; |
942 | return 0; |
943 | } |
944 | |
945 | do { |
946 | seq = read_seqbegin(&vblank->seqlock); |
947 | vblank_count = atomic64_read(&vblank->count)({ typeof(*(&vblank->count)) __tmp = *(volatile typeof (*(&vblank->count)) *)&(*(&vblank->count)); membar_datadep_consumer(); __tmp; }); |
948 | *vblanktime = vblank->time; |
949 | } while (read_seqretry(&vblank->seqlock, seq)); |
950 | |
951 | return vblank_count; |
952 | } |
953 | |
954 | /** |
955 | * drm_crtc_vblank_count_and_time - retrieve "cooked" vblank counter value |
956 | * and the system timestamp corresponding to that vblank counter value |
957 | * @crtc: which counter to retrieve |
958 | * @vblanktime: Pointer to time to receive the vblank timestamp. |
959 | * |
960 | * Fetches the "cooked" vblank count value that represents the number of |
961 | * vblank events since the system was booted, including lost events due to |
962 | * modesetting activity. Returns corresponding system timestamp of the time |
963 | * of the vblank interval that corresponds to the current vblank counter value. |
964 | * |
965 | * Note that for a given vblank counter value drm_crtc_handle_vblank() |
966 | * and drm_crtc_vblank_count() or drm_crtc_vblank_count_and_time() |
967 | * provide a barrier: Any writes done before calling |
968 | * drm_crtc_handle_vblank() will be visible to callers of the later |
969 | * functions, iff the vblank count is the same or a later one. |
970 | * |
971 | * See also &drm_vblank_crtc.count. |
972 | */ |
973 | u64 drm_crtc_vblank_count_and_time(struct drm_crtc *crtc, |
974 | ktime_t *vblanktime) |
975 | { |
976 | return drm_vblank_count_and_time(crtc->dev, drm_crtc_index(crtc), |
977 | vblanktime); |
978 | } |
979 | EXPORT_SYMBOL(drm_crtc_vblank_count_and_time); |
980 | |
981 | static void send_vblank_event(struct drm_device *dev, |
982 | struct drm_pending_vblank_event *e, |
983 | u64 seq, ktime_t now) |
984 | { |
985 | struct timespec64 tv; |
986 | |
987 | switch (e->event.base.type) { |
988 | case DRM_EVENT_VBLANK0x01: |
989 | case DRM_EVENT_FLIP_COMPLETE0x02: |
990 | tv = ktime_to_timespec64(now); |
991 | e->event.vbl.sequence = seq; |
992 | /* |
993 | * e->event is a user space structure, with hardcoded unsigned |
994 | * 32-bit seconds/microseconds. This is safe as we always use |
995 | * monotonic timestamps since linux-4.15 |
996 | */ |
997 | e->event.vbl.tv_sec = tv.tv_sec; |
998 | e->event.vbl.tv_usec = tv.tv_nsec / 1000; |
999 | break; |
1000 | case DRM_EVENT_CRTC_SEQUENCE0x03: |
1001 | if (seq) |
1002 | e->event.seq.sequence = seq; |
1003 | e->event.seq.time_ns = ktime_to_ns(now); |
1004 | break; |
1005 | } |
1006 | trace_drm_vblank_event_delivered(e->base.file_priv, e->pipe, seq); |
1007 | drm_send_event_locked(dev, &e->base); |
1008 | } |
1009 | |
1010 | /** |
1011 | * drm_crtc_arm_vblank_event - arm vblank event after pageflip |
1012 | * @crtc: the source CRTC of the vblank event |
1013 | * @e: the event to send |
1014 | * |
1015 | * A lot of drivers need to generate vblank events for the very next vblank |
1016 | * interrupt. For example when the page flip interrupt happens when the page |
1017 | * flip gets armed, but not when it actually executes within the next vblank |
1018 | * period. This helper function implements exactly the required vblank arming |
1019 | * behaviour. |
1020 | * |
1021 | * NOTE: Drivers using this to send out the &drm_crtc_state.event as part of an |
1022 | * atomic commit must ensure that the next vblank happens at exactly the same |
1023 | * time as the atomic commit is committed to the hardware. This function itself |
1024 | * does **not** protect against the next vblank interrupt racing with either this |
1025 | * function call or the atomic commit operation. A possible sequence could be: |
1026 | * |
1027 | * 1. Driver commits new hardware state into vblank-synchronized registers. |
1028 | * 2. A vblank happens, committing the hardware state. Also the corresponding |
1029 | * vblank interrupt is fired off and fully processed by the interrupt |
1030 | * handler. |
1031 | * 3. The atomic commit operation proceeds to call drm_crtc_arm_vblank_event(). |
1032 | * 4. The event is only send out for the next vblank, which is wrong. |
1033 | * |
1034 | * An equivalent race can happen when the driver calls |
1035 | * drm_crtc_arm_vblank_event() before writing out the new hardware state. |
1036 | * |
1037 | * The only way to make this work safely is to prevent the vblank from firing |
1038 | * (and the hardware from committing anything else) until the entire atomic |
1039 | * commit sequence has run to completion. If the hardware does not have such a |
1040 | * feature (e.g. using a "go" bit), then it is unsafe to use this functions. |
1041 | * Instead drivers need to manually send out the event from their interrupt |
1042 | * handler by calling drm_crtc_send_vblank_event() and make sure that there's no |
1043 | * possible race with the hardware committing the atomic update. |
1044 | * |
1045 | * Caller must hold a vblank reference for the event @e acquired by a |
1046 | * drm_crtc_vblank_get(), which will be dropped when the next vblank arrives. |
1047 | */ |
1048 | void drm_crtc_arm_vblank_event(struct drm_crtc *crtc, |
1049 | struct drm_pending_vblank_event *e) |
1050 | { |
1051 | struct drm_device *dev = crtc->dev; |
1052 | unsigned int pipe = drm_crtc_index(crtc); |
1053 | |
1054 | assert_spin_locked(&dev->event_lock)do { if (((&dev->event_lock)->mtx_owner != ({struct cpu_info *__ci; asm volatile("movq %%gs:%P1,%0" : "=r" (__ci ) :"n" (__builtin_offsetof(struct cpu_info, ci_self))); __ci; })) && !(panicstr || db_active)) panic("mutex %p not held in %s" , (&dev->event_lock), __func__); } while (0); |
1055 | |
1056 | e->pipe = pipe; |
1057 | e->sequence = drm_crtc_accurate_vblank_count(crtc) + 1; |
1058 | list_add_tail(&e->base.link, &dev->vblank_event_list); |
1059 | } |
1060 | EXPORT_SYMBOL(drm_crtc_arm_vblank_event); |
1061 | |
1062 | /** |
1063 | * drm_crtc_send_vblank_event - helper to send vblank event after pageflip |
1064 | * @crtc: the source CRTC of the vblank event |
1065 | * @e: the event to send |
1066 | * |
1067 | * Updates sequence # and timestamp on event for the most recently processed |
1068 | * vblank, and sends it to userspace. Caller must hold event lock. |
1069 | * |
1070 | * See drm_crtc_arm_vblank_event() for a helper which can be used in certain |
1071 | * situation, especially to send out events for atomic commit operations. |
1072 | */ |
1073 | void drm_crtc_send_vblank_event(struct drm_crtc *crtc, |
1074 | struct drm_pending_vblank_event *e) |
1075 | { |
1076 | struct drm_device *dev = crtc->dev; |
1077 | u64 seq; |
1078 | unsigned int pipe = drm_crtc_index(crtc); |
1079 | ktime_t now; |
1080 | |
1081 | if (drm_dev_has_vblank(dev)) { |
1082 | seq = drm_vblank_count_and_time(dev, pipe, &now); |
1083 | } else { |
1084 | seq = 0; |
1085 | |
1086 | now = ktime_get(); |
1087 | } |
1088 | e->pipe = pipe; |
1089 | send_vblank_event(dev, e, seq, now); |
1090 | } |
1091 | EXPORT_SYMBOL(drm_crtc_send_vblank_event); |
1092 | |
1093 | static int __enable_vblank(struct drm_device *dev, unsigned int pipe) |
1094 | { |
1095 | if (drm_core_check_feature(dev, DRIVER_MODESET)) { |
1096 | struct drm_crtc *crtc = drm_crtc_from_index(dev, pipe); |
1097 | |
1098 | if (drm_WARN_ON(dev, !crtc)({ int __ret = !!((!crtc)); if (__ret) printf("%s %s: " "%s", dev_driver_string(((dev))->dev), "", "drm_WARN_ON(" "!crtc" ")"); __builtin_expect(!!(__ret), 0); })) |
1099 | return 0; |
1100 | |
1101 | if (crtc->funcs->enable_vblank) |
1102 | return crtc->funcs->enable_vblank(crtc); |
1103 | } else if (dev->driver->enable_vblank) { |
1104 | return dev->driver->enable_vblank(dev, pipe); |
1105 | } |
1106 | |
1107 | return -EINVAL22; |
1108 | } |
1109 | |
1110 | static int drm_vblank_enable(struct drm_device *dev, unsigned int pipe) |
1111 | { |
1112 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
1113 | int ret = 0; |
1114 | |
1115 | assert_spin_locked(&dev->vbl_lock)do { if (((&dev->vbl_lock)->mtx_owner != ({struct cpu_info *__ci; asm volatile("movq %%gs:%P1,%0" : "=r" (__ci) :"n" (__builtin_offsetof (struct cpu_info, ci_self))); __ci;})) && !(panicstr || db_active)) panic("mutex %p not held in %s", (&dev->vbl_lock ), __func__); } while (0); |
1116 | |
1117 | spin_lock(&dev->vblank_time_lock)mtx_enter(&dev->vblank_time_lock); |
1118 | |
1119 | if (!vblank->enabled) { |
1120 | /* |
1121 | * Enable vblank irqs under vblank_time_lock protection. |
1122 | * All vblank count & timestamp updates are held off |
1123 | * until we are done reinitializing master counter and |
1124 | * timestamps. Filtercode in drm_handle_vblank() will |
1125 | * prevent double-accounting of same vblank interval. |
1126 | */ |
1127 | ret = __enable_vblank(dev, pipe); |
1128 | drm_dbg_core(dev, "enabling vblank on crtc %u, ret: %d\n",drm_dev_dbg((dev)->dev, DRM_UT_CORE, "enabling vblank on crtc %u, ret: %d\n" , pipe, ret) |
1129 | pipe, ret)drm_dev_dbg((dev)->dev, DRM_UT_CORE, "enabling vblank on crtc %u, ret: %d\n" , pipe, ret); |
1130 | if (ret) { |
1131 | atomic_dec(&vblank->refcount)__sync_fetch_and_sub(&vblank->refcount, 1); |
1132 | } else { |
1133 | drm_update_vblank_count(dev, pipe, 0); |
1134 | /* drm_update_vblank_count() includes a wmb so we just |
1135 | * need to ensure that the compiler emits the write |
1136 | * to mark the vblank as enabled after the call |
1137 | * to drm_update_vblank_count(). |
1138 | */ |
1139 | WRITE_ONCE(vblank->enabled, true)({ typeof(vblank->enabled) __tmp = (1); *(volatile typeof( vblank->enabled) *)&(vblank->enabled) = __tmp; __tmp ; }); |
1140 | } |
1141 | } |
1142 | |
1143 | spin_unlock(&dev->vblank_time_lock)mtx_leave(&dev->vblank_time_lock); |
1144 | |
1145 | return ret; |
1146 | } |
1147 | |
1148 | int drm_vblank_get(struct drm_device *dev, unsigned int pipe) |
1149 | { |
1150 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
1151 | unsigned long irqflags; |
1152 | int ret = 0; |
1153 | |
1154 | if (!drm_dev_has_vblank(dev)) |
1155 | return -EINVAL22; |
1156 | |
1157 | if (drm_WARN_ON(dev, pipe >= dev->num_crtcs)({ int __ret = !!((pipe >= dev->num_crtcs)); if (__ret) printf("%s %s: " "%s", dev_driver_string(((dev))->dev), "" , "drm_WARN_ON(" "pipe >= dev->num_crtcs" ")"); __builtin_expect (!!(__ret), 0); })) |
1158 | return -EINVAL22; |
1159 | |
1160 | spin_lock_irqsave(&dev->vbl_lock, irqflags)do { irqflags = 0; mtx_enter(&dev->vbl_lock); } while ( 0); |
1161 | /* Going from 0->1 means we have to enable interrupts again */ |
1162 | if (atomic_add_return(1, &vblank->refcount)__sync_add_and_fetch(&vblank->refcount, 1) == 1) { |
1163 | ret = drm_vblank_enable(dev, pipe); |
1164 | } else { |
1165 | if (!vblank->enabled) { |
1166 | atomic_dec(&vblank->refcount)__sync_fetch_and_sub(&vblank->refcount, 1); |
1167 | ret = -EINVAL22; |
1168 | } |
1169 | } |
1170 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags)do { (void)(irqflags); mtx_leave(&dev->vbl_lock); } while (0); |
1171 | |
1172 | return ret; |
1173 | } |
1174 | |
1175 | /** |
1176 | * drm_crtc_vblank_get - get a reference count on vblank events |
1177 | * @crtc: which CRTC to own |
1178 | * |
1179 | * Acquire a reference count on vblank events to avoid having them disabled |
1180 | * while in use. |
1181 | * |
1182 | * Returns: |
1183 | * Zero on success or a negative error code on failure. |
1184 | */ |
1185 | int drm_crtc_vblank_get(struct drm_crtc *crtc) |
1186 | { |
1187 | return drm_vblank_get(crtc->dev, drm_crtc_index(crtc)); |
1188 | } |
1189 | EXPORT_SYMBOL(drm_crtc_vblank_get); |
1190 | |
1191 | void drm_vblank_put(struct drm_device *dev, unsigned int pipe) |
1192 | { |
1193 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
1194 | |
1195 | if (drm_WARN_ON(dev, pipe >= dev->num_crtcs)({ int __ret = !!((pipe >= dev->num_crtcs)); if (__ret) printf("%s %s: " "%s", dev_driver_string(((dev))->dev), "" , "drm_WARN_ON(" "pipe >= dev->num_crtcs" ")"); __builtin_expect (!!(__ret), 0); })) |
1196 | return; |
1197 | |
1198 | if (drm_WARN_ON(dev, atomic_read(&vblank->refcount) == 0)({ int __ret = !!((({ typeof(*(&vblank->refcount)) __tmp = *(volatile typeof(*(&vblank->refcount)) *)&(*(& vblank->refcount)); membar_datadep_consumer(); __tmp; }) == 0)); if (__ret) printf("%s %s: " "%s", dev_driver_string(((dev ))->dev), "", "drm_WARN_ON(" "({ typeof(*(&vblank->refcount)) __tmp = *(volatile typeof(*(&vblank->refcount)) *)&(*(&vblank->refcount)); membar_datadep_consumer(); __tmp; }) == 0" ")"); __builtin_expect(!!(__ret), 0); })) |
1199 | return; |
1200 | |
1201 | /* Last user schedules interrupt disable */ |
1202 | if (atomic_dec_and_test(&vblank->refcount)(__sync_sub_and_fetch((&vblank->refcount), 1) == 0)) { |
1203 | if (drm_vblank_offdelay == 0) |
1204 | return; |
1205 | else if (drm_vblank_offdelay < 0) |
1206 | vblank_disable_fn(vblank); |
1207 | else if (!dev->vblank_disable_immediate) |
1208 | mod_timer(&vblank->disable_timer, |
1209 | jiffies + ((drm_vblank_offdelay * HZhz)/1000)); |
1210 | } |
1211 | } |
1212 | |
1213 | /** |
1214 | * drm_crtc_vblank_put - give up ownership of vblank events |
1215 | * @crtc: which counter to give up |
1216 | * |
1217 | * Release ownership of a given vblank counter, turning off interrupts |
1218 | * if possible. Disable interrupts after drm_vblank_offdelay milliseconds. |
1219 | */ |
1220 | void drm_crtc_vblank_put(struct drm_crtc *crtc) |
1221 | { |
1222 | drm_vblank_put(crtc->dev, drm_crtc_index(crtc)); |
1223 | } |
1224 | EXPORT_SYMBOL(drm_crtc_vblank_put); |
1225 | |
1226 | /** |
1227 | * drm_wait_one_vblank - wait for one vblank |
1228 | * @dev: DRM device |
1229 | * @pipe: CRTC index |
1230 | * |
1231 | * This waits for one vblank to pass on @pipe, using the irq driver interfaces. |
1232 | * It is a failure to call this when the vblank irq for @pipe is disabled, e.g. |
1233 | * due to lack of driver support or because the crtc is off. |
1234 | * |
1235 | * This is the legacy version of drm_crtc_wait_one_vblank(). |
1236 | */ |
1237 | void drm_wait_one_vblank(struct drm_device *dev, unsigned int pipe) |
1238 | { |
1239 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
1240 | int ret; |
1241 | u64 last; |
1242 | |
1243 | if (drm_WARN_ON(dev, pipe >= dev->num_crtcs)({ int __ret = !!((pipe >= dev->num_crtcs)); if (__ret) printf("%s %s: " "%s", dev_driver_string(((dev))->dev), "" , "drm_WARN_ON(" "pipe >= dev->num_crtcs" ")"); __builtin_expect (!!(__ret), 0); })) |
1244 | return; |
1245 | |
1246 | #ifdef __OpenBSD__1 |
1247 | /* |
1248 | * If we're cold, vblank interrupts won't happen even if |
1249 | * they're turned on by the driver. Just stall long enough |
1250 | * for a vblank to pass. This assumes a vrefresh of at least |
1251 | * 25 Hz. |
1252 | */ |
1253 | if (cold) { |
1254 | delay(40000)(*delay_func)(40000); |
1255 | return; |
1256 | } |
1257 | #endif |
1258 | |
1259 | ret = drm_vblank_get(dev, pipe); |
1260 | if (drm_WARN(dev, ret, "vblank not available on crtc %i, ret=%i\n",({ int __ret = !!(ret); if (__ret) printf("%s %s: " "vblank not available on crtc %i, ret=%i\n" , dev_driver_string((dev)->dev), "", pipe, ret); __builtin_expect (!!(__ret), 0); }) |
1261 | pipe, ret)({ int __ret = !!(ret); if (__ret) printf("%s %s: " "vblank not available on crtc %i, ret=%i\n" , dev_driver_string((dev)->dev), "", pipe, ret); __builtin_expect (!!(__ret), 0); })) |
1262 | return; |
1263 | |
1264 | last = drm_vblank_count(dev, pipe); |
1265 | |
1266 | ret = wait_event_timeout(vblank->queue,({ long __ret = (((uint64_t)(100)) * hz / 1000); if (!(last != drm_vblank_count(dev, pipe))) __ret = ({ long ret = (((uint64_t )(100)) * hz / 1000); do { int __error; unsigned long deadline ; ((!cold) ? (void)0 : __assert("diagnostic ", "/usr/src/sys/dev/pci/drm/drm_vblank.c" , 1268, "!cold")); mtx_enter(&sch_mtx); deadline = jiffies + ret; __error = msleep(&vblank->queue, &sch_mtx, 0, "drmweti", ret); ret = deadline - jiffies; if (__error == -1 || __error == 4) { ret = -4; mtx_leave(&sch_mtx); break ; } if (((((uint64_t)(100)) * hz / 1000)) > 0 && ( ret <= 0 || __error == 35)) { mtx_leave(&sch_mtx); ret = ((last != drm_vblank_count(dev, pipe))) ? 1 : 0; break; } mtx_leave (&sch_mtx); } while (ret > 0 && !(last != drm_vblank_count (dev, pipe))); ret; }); __ret; }) |
1267 | last != drm_vblank_count(dev, pipe),({ long __ret = (((uint64_t)(100)) * hz / 1000); if (!(last != drm_vblank_count(dev, pipe))) __ret = ({ long ret = (((uint64_t )(100)) * hz / 1000); do { int __error; unsigned long deadline ; ((!cold) ? (void)0 : __assert("diagnostic ", "/usr/src/sys/dev/pci/drm/drm_vblank.c" , 1268, "!cold")); mtx_enter(&sch_mtx); deadline = jiffies + ret; __error = msleep(&vblank->queue, &sch_mtx, 0, "drmweti", ret); ret = deadline - jiffies; if (__error == -1 || __error == 4) { ret = -4; mtx_leave(&sch_mtx); break ; } if (((((uint64_t)(100)) * hz / 1000)) > 0 && ( ret <= 0 || __error == 35)) { mtx_leave(&sch_mtx); ret = ((last != drm_vblank_count(dev, pipe))) ? 1 : 0; break; } mtx_leave (&sch_mtx); } while (ret > 0 && !(last != drm_vblank_count (dev, pipe))); ret; }); __ret; }) |
1268 | msecs_to_jiffies(100))({ long __ret = (((uint64_t)(100)) * hz / 1000); if (!(last != drm_vblank_count(dev, pipe))) __ret = ({ long ret = (((uint64_t )(100)) * hz / 1000); do { int __error; unsigned long deadline ; ((!cold) ? (void)0 : __assert("diagnostic ", "/usr/src/sys/dev/pci/drm/drm_vblank.c" , 1268, "!cold")); mtx_enter(&sch_mtx); deadline = jiffies + ret; __error = msleep(&vblank->queue, &sch_mtx, 0, "drmweti", ret); ret = deadline - jiffies; if (__error == -1 || __error == 4) { ret = -4; mtx_leave(&sch_mtx); break ; } if (((((uint64_t)(100)) * hz / 1000)) > 0 && ( ret <= 0 || __error == 35)) { mtx_leave(&sch_mtx); ret = ((last != drm_vblank_count(dev, pipe))) ? 1 : 0; break; } mtx_leave (&sch_mtx); } while (ret > 0 && !(last != drm_vblank_count (dev, pipe))); ret; }); __ret; }); |
1269 | |
1270 | drm_WARN(dev, ret == 0, "vblank wait timed out on crtc %i\n", pipe)({ int __ret = !!(ret == 0); if (__ret) printf("%s %s: " "vblank wait timed out on crtc %i\n" , dev_driver_string((dev)->dev), "", pipe); __builtin_expect (!!(__ret), 0); }); |
1271 | |
1272 | drm_vblank_put(dev, pipe); |
1273 | } |
1274 | EXPORT_SYMBOL(drm_wait_one_vblank); |
1275 | |
1276 | /** |
1277 | * drm_crtc_wait_one_vblank - wait for one vblank |
1278 | * @crtc: DRM crtc |
1279 | * |
1280 | * This waits for one vblank to pass on @crtc, using the irq driver interfaces. |
1281 | * It is a failure to call this when the vblank irq for @crtc is disabled, e.g. |
1282 | * due to lack of driver support or because the crtc is off. |
1283 | */ |
1284 | void drm_crtc_wait_one_vblank(struct drm_crtc *crtc) |
1285 | { |
1286 | drm_wait_one_vblank(crtc->dev, drm_crtc_index(crtc)); |
1287 | } |
1288 | EXPORT_SYMBOL(drm_crtc_wait_one_vblank); |
1289 | |
1290 | /** |
1291 | * drm_crtc_vblank_off - disable vblank events on a CRTC |
1292 | * @crtc: CRTC in question |
1293 | * |
1294 | * Drivers can use this function to shut down the vblank interrupt handling when |
1295 | * disabling a crtc. This function ensures that the latest vblank frame count is |
1296 | * stored so that drm_vblank_on can restore it again. |
1297 | * |
1298 | * Drivers must use this function when the hardware vblank counter can get |
1299 | * reset, e.g. when suspending or disabling the @crtc in general. |
1300 | */ |
1301 | void drm_crtc_vblank_off(struct drm_crtc *crtc) |
1302 | { |
1303 | struct drm_device *dev = crtc->dev; |
1304 | unsigned int pipe = drm_crtc_index(crtc); |
1305 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
1306 | struct drm_pending_vblank_event *e, *t; |
1307 | ktime_t now; |
1308 | u64 seq; |
1309 | |
1310 | if (drm_WARN_ON(dev, pipe >= dev->num_crtcs)({ int __ret = !!((pipe >= dev->num_crtcs)); if (__ret) printf("%s %s: " "%s", dev_driver_string(((dev))->dev), "" , "drm_WARN_ON(" "pipe >= dev->num_crtcs" ")"); __builtin_expect (!!(__ret), 0); })) |
1311 | return; |
1312 | |
1313 | /* |
1314 | * Grab event_lock early to prevent vblank work from being scheduled |
1315 | * while we're in the middle of shutting down vblank interrupts |
1316 | */ |
1317 | spin_lock_irq(&dev->event_lock)mtx_enter(&dev->event_lock); |
1318 | |
1319 | spin_lock(&dev->vbl_lock)mtx_enter(&dev->vbl_lock); |
1320 | drm_dbg_vbl(dev, "crtc %d, vblank enabled %d, inmodeset %d\n",drm_dev_dbg((dev)->dev, DRM_UT_VBL, "crtc %d, vblank enabled %d, inmodeset %d\n" , pipe, vblank->enabled, vblank->inmodeset) |
1321 | pipe, vblank->enabled, vblank->inmodeset)drm_dev_dbg((dev)->dev, DRM_UT_VBL, "crtc %d, vblank enabled %d, inmodeset %d\n" , pipe, vblank->enabled, vblank->inmodeset); |
1322 | |
1323 | /* Avoid redundant vblank disables without previous |
1324 | * drm_crtc_vblank_on(). */ |
1325 | if (drm_core_check_feature(dev, DRIVER_ATOMIC) || !vblank->inmodeset) |
1326 | drm_vblank_disable_and_save(dev, pipe); |
1327 | |
1328 | wake_up(&vblank->queue); |
1329 | |
1330 | /* |
1331 | * Prevent subsequent drm_vblank_get() from re-enabling |
1332 | * the vblank interrupt by bumping the refcount. |
1333 | */ |
1334 | if (!vblank->inmodeset) { |
1335 | atomic_inc(&vblank->refcount)__sync_fetch_and_add(&vblank->refcount, 1); |
1336 | vblank->inmodeset = 1; |
1337 | } |
1338 | spin_unlock(&dev->vbl_lock)mtx_leave(&dev->vbl_lock); |
1339 | |
1340 | /* Send any queued vblank events, lest the natives grow disquiet */ |
1341 | seq = drm_vblank_count_and_time(dev, pipe, &now); |
1342 | |
1343 | list_for_each_entry_safe(e, t, &dev->vblank_event_list, base.link)for (e = ({ const __typeof( ((__typeof(*e) *)0)->base.link ) *__mptr = ((&dev->vblank_event_list)->next); (__typeof (*e) *)( (char *)__mptr - __builtin_offsetof(__typeof(*e), base .link) );}), t = ({ const __typeof( ((__typeof(*e) *)0)->base .link ) *__mptr = (e->base.link.next); (__typeof(*e) *)( ( char *)__mptr - __builtin_offsetof(__typeof(*e), base.link) ) ;}); &e->base.link != (&dev->vblank_event_list) ; e = t, t = ({ const __typeof( ((__typeof(*t) *)0)->base. link ) *__mptr = (t->base.link.next); (__typeof(*t) *)( (char *)__mptr - __builtin_offsetof(__typeof(*t), base.link) );})) { |
1344 | if (e->pipe != pipe) |
1345 | continue; |
1346 | drm_dbg_core(dev, "Sending premature vblank event on disable: "drm_dev_dbg((dev)->dev, DRM_UT_CORE, "Sending premature vblank event on disable: " "wanted %llu, current %llu\n", e->sequence, seq) |
1347 | "wanted %llu, current %llu\n",drm_dev_dbg((dev)->dev, DRM_UT_CORE, "Sending premature vblank event on disable: " "wanted %llu, current %llu\n", e->sequence, seq) |
1348 | e->sequence, seq)drm_dev_dbg((dev)->dev, DRM_UT_CORE, "Sending premature vblank event on disable: " "wanted %llu, current %llu\n", e->sequence, seq); |
1349 | list_del(&e->base.link); |
1350 | drm_vblank_put(dev, pipe); |
1351 | send_vblank_event(dev, e, seq, now); |
1352 | } |
1353 | |
1354 | /* Cancel any leftover pending vblank work */ |
1355 | drm_vblank_cancel_pending_works(vblank); |
1356 | |
1357 | spin_unlock_irq(&dev->event_lock)mtx_leave(&dev->event_lock); |
1358 | |
1359 | /* Will be reset by the modeset helpers when re-enabling the crtc by |
1360 | * calling drm_calc_timestamping_constants(). */ |
1361 | vblank->hwmode.crtc_clock = 0; |
1362 | |
1363 | /* Wait for any vblank work that's still executing to finish */ |
1364 | drm_vblank_flush_worker(vblank); |
1365 | } |
1366 | EXPORT_SYMBOL(drm_crtc_vblank_off); |
1367 | |
1368 | /** |
1369 | * drm_crtc_vblank_reset - reset vblank state to off on a CRTC |
1370 | * @crtc: CRTC in question |
1371 | * |
1372 | * Drivers can use this function to reset the vblank state to off at load time. |
1373 | * Drivers should use this together with the drm_crtc_vblank_off() and |
1374 | * drm_crtc_vblank_on() functions. The difference compared to |
1375 | * drm_crtc_vblank_off() is that this function doesn't save the vblank counter |
1376 | * and hence doesn't need to call any driver hooks. |
1377 | * |
1378 | * This is useful for recovering driver state e.g. on driver load, or on resume. |
1379 | */ |
1380 | void drm_crtc_vblank_reset(struct drm_crtc *crtc) |
1381 | { |
1382 | struct drm_device *dev = crtc->dev; |
1383 | unsigned int pipe = drm_crtc_index(crtc); |
1384 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
1385 | |
1386 | spin_lock_irq(&dev->vbl_lock)mtx_enter(&dev->vbl_lock); |
1387 | /* |
1388 | * Prevent subsequent drm_vblank_get() from enabling the vblank |
1389 | * interrupt by bumping the refcount. |
1390 | */ |
1391 | if (!vblank->inmodeset) { |
1392 | atomic_inc(&vblank->refcount)__sync_fetch_and_add(&vblank->refcount, 1); |
1393 | vblank->inmodeset = 1; |
1394 | } |
1395 | spin_unlock_irq(&dev->vbl_lock)mtx_leave(&dev->vbl_lock); |
1396 | |
1397 | drm_WARN_ON(dev, !list_empty(&dev->vblank_event_list))({ int __ret = !!((!list_empty(&dev->vblank_event_list ))); if (__ret) printf("%s %s: " "%s", dev_driver_string(((dev ))->dev), "", "drm_WARN_ON(" "!list_empty(&dev->vblank_event_list)" ")"); __builtin_expect(!!(__ret), 0); }); |
1398 | drm_WARN_ON(dev, !list_empty(&vblank->pending_work))({ int __ret = !!((!list_empty(&vblank->pending_work)) ); if (__ret) printf("%s %s: " "%s", dev_driver_string(((dev) )->dev), "", "drm_WARN_ON(" "!list_empty(&vblank->pending_work)" ")"); __builtin_expect(!!(__ret), 0); }); |
1399 | } |
1400 | EXPORT_SYMBOL(drm_crtc_vblank_reset); |
1401 | |
1402 | /** |
1403 | * drm_crtc_set_max_vblank_count - configure the hw max vblank counter value |
1404 | * @crtc: CRTC in question |
1405 | * @max_vblank_count: max hardware vblank counter value |
1406 | * |
1407 | * Update the maximum hardware vblank counter value for @crtc |
1408 | * at runtime. Useful for hardware where the operation of the |
1409 | * hardware vblank counter depends on the currently active |
1410 | * display configuration. |
1411 | * |
1412 | * For example, if the hardware vblank counter does not work |
1413 | * when a specific connector is active the maximum can be set |
1414 | * to zero. And when that specific connector isn't active the |
1415 | * maximum can again be set to the appropriate non-zero value. |
1416 | * |
1417 | * If used, must be called before drm_vblank_on(). |
1418 | */ |
1419 | void drm_crtc_set_max_vblank_count(struct drm_crtc *crtc, |
1420 | u32 max_vblank_count) |
1421 | { |
1422 | struct drm_device *dev = crtc->dev; |
1423 | unsigned int pipe = drm_crtc_index(crtc); |
1424 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
1425 | |
1426 | drm_WARN_ON(dev, dev->max_vblank_count)({ int __ret = !!((dev->max_vblank_count)); if (__ret) printf ("%s %s: " "%s", dev_driver_string(((dev))->dev), "", "drm_WARN_ON(" "dev->max_vblank_count" ")"); __builtin_expect(!!(__ret), 0); }); |
1427 | drm_WARN_ON(dev, !READ_ONCE(vblank->inmodeset))({ int __ret = !!((!({ typeof(vblank->inmodeset) __tmp = * (volatile typeof(vblank->inmodeset) *)&(vblank->inmodeset ); membar_datadep_consumer(); __tmp; }))); if (__ret) printf( "%s %s: " "%s", dev_driver_string(((dev))->dev), "", "drm_WARN_ON(" "!({ typeof(vblank->inmodeset) __tmp = *(volatile typeof(vblank->inmodeset) *)&(vblank->inmodeset); membar_datadep_consumer(); __tmp; })" ")"); __builtin_expect(!!(__ret), 0); }); |
1428 | |
1429 | vblank->max_vblank_count = max_vblank_count; |
1430 | } |
1431 | EXPORT_SYMBOL(drm_crtc_set_max_vblank_count); |
1432 | |
1433 | /** |
1434 | * drm_crtc_vblank_on - enable vblank events on a CRTC |
1435 | * @crtc: CRTC in question |
1436 | * |
1437 | * This functions restores the vblank interrupt state captured with |
1438 | * drm_crtc_vblank_off() again and is generally called when enabling @crtc. Note |
1439 | * that calls to drm_crtc_vblank_on() and drm_crtc_vblank_off() can be |
1440 | * unbalanced and so can also be unconditionally called in driver load code to |
1441 | * reflect the current hardware state of the crtc. |
1442 | */ |
1443 | void drm_crtc_vblank_on(struct drm_crtc *crtc) |
1444 | { |
1445 | struct drm_device *dev = crtc->dev; |
1446 | unsigned int pipe = drm_crtc_index(crtc); |
1447 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
1448 | |
1449 | if (drm_WARN_ON(dev, pipe >= dev->num_crtcs)({ int __ret = !!((pipe >= dev->num_crtcs)); if (__ret) printf("%s %s: " "%s", dev_driver_string(((dev))->dev), "" , "drm_WARN_ON(" "pipe >= dev->num_crtcs" ")"); __builtin_expect (!!(__ret), 0); })) |
1450 | return; |
1451 | |
1452 | spin_lock_irq(&dev->vbl_lock)mtx_enter(&dev->vbl_lock); |
1453 | drm_dbg_vbl(dev, "crtc %d, vblank enabled %d, inmodeset %d\n",drm_dev_dbg((dev)->dev, DRM_UT_VBL, "crtc %d, vblank enabled %d, inmodeset %d\n" , pipe, vblank->enabled, vblank->inmodeset) |
1454 | pipe, vblank->enabled, vblank->inmodeset)drm_dev_dbg((dev)->dev, DRM_UT_VBL, "crtc %d, vblank enabled %d, inmodeset %d\n" , pipe, vblank->enabled, vblank->inmodeset); |
1455 | |
1456 | /* Drop our private "prevent drm_vblank_get" refcount */ |
1457 | if (vblank->inmodeset) { |
1458 | atomic_dec(&vblank->refcount)__sync_fetch_and_sub(&vblank->refcount, 1); |
1459 | vblank->inmodeset = 0; |
1460 | } |
1461 | |
1462 | drm_reset_vblank_timestamp(dev, pipe); |
1463 | |
1464 | /* |
1465 | * re-enable interrupts if there are users left, or the |
1466 | * user wishes vblank interrupts to be enabled all the time. |
1467 | */ |
1468 | if (atomic_read(&vblank->refcount)({ typeof(*(&vblank->refcount)) __tmp = *(volatile typeof (*(&vblank->refcount)) *)&(*(&vblank->refcount )); membar_datadep_consumer(); __tmp; }) != 0 || drm_vblank_offdelay == 0) |
1469 | drm_WARN_ON(dev, drm_vblank_enable(dev, pipe))({ int __ret = !!((drm_vblank_enable(dev, pipe))); if (__ret) printf("%s %s: " "%s", dev_driver_string(((dev))->dev), "" , "drm_WARN_ON(" "drm_vblank_enable(dev, pipe)" ")"); __builtin_expect (!!(__ret), 0); }); |
1470 | spin_unlock_irq(&dev->vbl_lock)mtx_leave(&dev->vbl_lock); |
1471 | } |
1472 | EXPORT_SYMBOL(drm_crtc_vblank_on); |
1473 | |
1474 | /** |
1475 | * drm_vblank_restore - estimate missed vblanks and update vblank count. |
1476 | * @dev: DRM device |
1477 | * @pipe: CRTC index |
1478 | * |
1479 | * Power manamement features can cause frame counter resets between vblank |
1480 | * disable and enable. Drivers can use this function in their |
1481 | * &drm_crtc_funcs.enable_vblank implementation to estimate missed vblanks since |
1482 | * the last &drm_crtc_funcs.disable_vblank using timestamps and update the |
1483 | * vblank counter. |
1484 | * |
1485 | * This function is the legacy version of drm_crtc_vblank_restore(). |
1486 | */ |
1487 | void drm_vblank_restore(struct drm_device *dev, unsigned int pipe) |
1488 | { |
1489 | ktime_t t_vblank; |
1490 | struct drm_vblank_crtc *vblank; |
1491 | int framedur_ns; |
1492 | u64 diff_ns; |
1493 | u32 cur_vblank, diff = 1; |
1494 | int count = DRM_TIMESTAMP_MAXRETRIES3; |
1495 | |
1496 | if (drm_WARN_ON(dev, pipe >= dev->num_crtcs)({ int __ret = !!((pipe >= dev->num_crtcs)); if (__ret) printf("%s %s: " "%s", dev_driver_string(((dev))->dev), "" , "drm_WARN_ON(" "pipe >= dev->num_crtcs" ")"); __builtin_expect (!!(__ret), 0); })) |
1497 | return; |
1498 | |
1499 | assert_spin_locked(&dev->vbl_lock)do { if (((&dev->vbl_lock)->mtx_owner != ({struct cpu_info *__ci; asm volatile("movq %%gs:%P1,%0" : "=r" (__ci) :"n" (__builtin_offsetof (struct cpu_info, ci_self))); __ci;})) && !(panicstr || db_active)) panic("mutex %p not held in %s", (&dev->vbl_lock ), __func__); } while (0); |
1500 | assert_spin_locked(&dev->vblank_time_lock)do { if (((&dev->vblank_time_lock)->mtx_owner != ({ struct cpu_info *__ci; asm volatile("movq %%gs:%P1,%0" : "=r" (__ci) :"n" (__builtin_offsetof(struct cpu_info, ci_self))); __ci;})) && !(panicstr || db_active)) panic("mutex %p not held in %s" , (&dev->vblank_time_lock), __func__); } while (0); |
1501 | |
1502 | vblank = &dev->vblank[pipe]; |
1503 | drm_WARN_ONCE(dev,({ static int __warned; int __ret = !!(drm_debug_enabled(DRM_UT_VBL ) && !vblank->framedur_ns); if (__ret && ! __warned) { printf("%s %s: " "Cannot compute missed vblanks without frame duration\n" , dev_driver_string((dev)->dev), ""); __warned = 1; } __builtin_expect (!!(__ret), 0); }) |
1504 | drm_debug_enabled(DRM_UT_VBL) && !vblank->framedur_ns,({ static int __warned; int __ret = !!(drm_debug_enabled(DRM_UT_VBL ) && !vblank->framedur_ns); if (__ret && ! __warned) { printf("%s %s: " "Cannot compute missed vblanks without frame duration\n" , dev_driver_string((dev)->dev), ""); __warned = 1; } __builtin_expect (!!(__ret), 0); }) |
1505 | "Cannot compute missed vblanks without frame duration\n")({ static int __warned; int __ret = !!(drm_debug_enabled(DRM_UT_VBL ) && !vblank->framedur_ns); if (__ret && ! __warned) { printf("%s %s: " "Cannot compute missed vblanks without frame duration\n" , dev_driver_string((dev)->dev), ""); __warned = 1; } __builtin_expect (!!(__ret), 0); }); |
1506 | framedur_ns = vblank->framedur_ns; |
1507 | |
1508 | do { |
1509 | cur_vblank = __get_vblank_counter(dev, pipe); |
1510 | drm_get_last_vbltimestamp(dev, pipe, &t_vblank, false0); |
1511 | } while (cur_vblank != __get_vblank_counter(dev, pipe) && --count > 0); |
1512 | |
1513 | diff_ns = ktime_to_ns(ktime_sub(t_vblank, vblank->time)); |
1514 | if (framedur_ns) |
1515 | diff = DIV_ROUND_CLOSEST_ULL(diff_ns, framedur_ns)(((diff_ns) + ((framedur_ns) / 2)) / (framedur_ns)); |
1516 | |
1517 | |
1518 | drm_dbg_vbl(dev,drm_dev_dbg((dev)->dev, DRM_UT_VBL, "missed %d vblanks in %lld ns, frame duration=%d ns, hw_diff=%d\n" , diff, diff_ns, framedur_ns, cur_vblank - vblank->last) |
1519 | "missed %d vblanks in %lld ns, frame duration=%d ns, hw_diff=%d\n",drm_dev_dbg((dev)->dev, DRM_UT_VBL, "missed %d vblanks in %lld ns, frame duration=%d ns, hw_diff=%d\n" , diff, diff_ns, framedur_ns, cur_vblank - vblank->last) |
1520 | diff, diff_ns, framedur_ns, cur_vblank - vblank->last)drm_dev_dbg((dev)->dev, DRM_UT_VBL, "missed %d vblanks in %lld ns, frame duration=%d ns, hw_diff=%d\n" , diff, diff_ns, framedur_ns, cur_vblank - vblank->last); |
1521 | store_vblank(dev, pipe, diff, t_vblank, cur_vblank); |
1522 | } |
1523 | EXPORT_SYMBOL(drm_vblank_restore); |
1524 | |
1525 | /** |
1526 | * drm_crtc_vblank_restore - estimate missed vblanks and update vblank count. |
1527 | * @crtc: CRTC in question |
1528 | * |
1529 | * Power manamement features can cause frame counter resets between vblank |
1530 | * disable and enable. Drivers can use this function in their |
1531 | * &drm_crtc_funcs.enable_vblank implementation to estimate missed vblanks since |
1532 | * the last &drm_crtc_funcs.disable_vblank using timestamps and update the |
1533 | * vblank counter. |
1534 | */ |
1535 | void drm_crtc_vblank_restore(struct drm_crtc *crtc) |
1536 | { |
1537 | drm_vblank_restore(crtc->dev, drm_crtc_index(crtc)); |
1538 | } |
1539 | EXPORT_SYMBOL(drm_crtc_vblank_restore); |
1540 | |
1541 | static void drm_legacy_vblank_pre_modeset(struct drm_device *dev, |
1542 | unsigned int pipe) |
1543 | { |
1544 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
1545 | |
1546 | /* vblank is not initialized (IRQ not installed ?), or has been freed */ |
1547 | if (!drm_dev_has_vblank(dev)) |
1548 | return; |
1549 | |
1550 | if (drm_WARN_ON(dev, pipe >= dev->num_crtcs)({ int __ret = !!((pipe >= dev->num_crtcs)); if (__ret) printf("%s %s: " "%s", dev_driver_string(((dev))->dev), "" , "drm_WARN_ON(" "pipe >= dev->num_crtcs" ")"); __builtin_expect (!!(__ret), 0); })) |
1551 | return; |
1552 | |
1553 | /* |
1554 | * To avoid all the problems that might happen if interrupts |
1555 | * were enabled/disabled around or between these calls, we just |
1556 | * have the kernel take a reference on the CRTC (just once though |
1557 | * to avoid corrupting the count if multiple, mismatch calls occur), |
1558 | * so that interrupts remain enabled in the interim. |
1559 | */ |
1560 | if (!vblank->inmodeset) { |
1561 | vblank->inmodeset = 0x1; |
1562 | if (drm_vblank_get(dev, pipe) == 0) |
1563 | vblank->inmodeset |= 0x2; |
1564 | } |
1565 | } |
1566 | |
1567 | static void drm_legacy_vblank_post_modeset(struct drm_device *dev, |
1568 | unsigned int pipe) |
1569 | { |
1570 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
1571 | |
1572 | /* vblank is not initialized (IRQ not installed ?), or has been freed */ |
1573 | if (!drm_dev_has_vblank(dev)) |
1574 | return; |
1575 | |
1576 | if (drm_WARN_ON(dev, pipe >= dev->num_crtcs)({ int __ret = !!((pipe >= dev->num_crtcs)); if (__ret) printf("%s %s: " "%s", dev_driver_string(((dev))->dev), "" , "drm_WARN_ON(" "pipe >= dev->num_crtcs" ")"); __builtin_expect (!!(__ret), 0); })) |
1577 | return; |
1578 | |
1579 | if (vblank->inmodeset) { |
1580 | spin_lock_irq(&dev->vbl_lock)mtx_enter(&dev->vbl_lock); |
1581 | drm_reset_vblank_timestamp(dev, pipe); |
1582 | spin_unlock_irq(&dev->vbl_lock)mtx_leave(&dev->vbl_lock); |
1583 | |
1584 | if (vblank->inmodeset & 0x2) |
1585 | drm_vblank_put(dev, pipe); |
1586 | |
1587 | vblank->inmodeset = 0; |
1588 | } |
1589 | } |
1590 | |
1591 | int drm_legacy_modeset_ctl_ioctl(struct drm_device *dev, void *data, |
1592 | struct drm_file *file_priv) |
1593 | { |
1594 | struct drm_modeset_ctl *modeset = data; |
1595 | unsigned int pipe; |
1596 | |
1597 | /* If drm_vblank_init() hasn't been called yet, just no-op */ |
1598 | if (!drm_dev_has_vblank(dev)) |
1599 | return 0; |
1600 | |
1601 | /* KMS drivers handle this internally */ |
1602 | if (!drm_core_check_feature(dev, DRIVER_LEGACY)) |
1603 | return 0; |
1604 | |
1605 | pipe = modeset->crtc; |
1606 | if (pipe >= dev->num_crtcs) |
1607 | return -EINVAL22; |
1608 | |
1609 | switch (modeset->cmd) { |
1610 | case _DRM_PRE_MODESET1: |
1611 | drm_legacy_vblank_pre_modeset(dev, pipe); |
1612 | break; |
1613 | case _DRM_POST_MODESET2: |
1614 | drm_legacy_vblank_post_modeset(dev, pipe); |
1615 | break; |
1616 | default: |
1617 | return -EINVAL22; |
1618 | } |
1619 | |
1620 | return 0; |
1621 | } |
1622 | |
1623 | static int drm_queue_vblank_event(struct drm_device *dev, unsigned int pipe, |
1624 | u64 req_seq, |
1625 | union drm_wait_vblank *vblwait, |
1626 | struct drm_file *file_priv) |
1627 | { |
1628 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
1629 | struct drm_pending_vblank_event *e; |
1630 | ktime_t now; |
1631 | u64 seq; |
1632 | int ret; |
1633 | |
1634 | e = kzalloc(sizeof(*e), GFP_KERNEL(0x0001 | 0x0004)); |
1635 | if (e == NULL((void *)0)) { |
1636 | ret = -ENOMEM12; |
1637 | goto err_put; |
1638 | } |
1639 | |
1640 | e->pipe = pipe; |
1641 | e->event.base.type = DRM_EVENT_VBLANK0x01; |
1642 | e->event.base.length = sizeof(e->event.vbl); |
1643 | e->event.vbl.user_data = vblwait->request.signal; |
1644 | e->event.vbl.crtc_id = 0; |
1645 | if (drm_core_check_feature(dev, DRIVER_MODESET)) { |
1646 | struct drm_crtc *crtc = drm_crtc_from_index(dev, pipe); |
1647 | |
1648 | if (crtc) |
1649 | e->event.vbl.crtc_id = crtc->base.id; |
1650 | } |
1651 | |
1652 | spin_lock_irq(&dev->event_lock)mtx_enter(&dev->event_lock); |
1653 | |
1654 | /* |
1655 | * drm_crtc_vblank_off() might have been called after we called |
1656 | * drm_vblank_get(). drm_crtc_vblank_off() holds event_lock around the |
1657 | * vblank disable, so no need for further locking. The reference from |
1658 | * drm_vblank_get() protects against vblank disable from another source. |
1659 | */ |
1660 | if (!READ_ONCE(vblank->enabled)({ typeof(vblank->enabled) __tmp = *(volatile typeof(vblank ->enabled) *)&(vblank->enabled); membar_datadep_consumer (); __tmp; })) { |
1661 | ret = -EINVAL22; |
1662 | goto err_unlock; |
1663 | } |
1664 | |
1665 | ret = drm_event_reserve_init_locked(dev, file_priv, &e->base, |
1666 | &e->event.base); |
1667 | |
1668 | if (ret) |
1669 | goto err_unlock; |
1670 | |
1671 | seq = drm_vblank_count_and_time(dev, pipe, &now); |
1672 | |
1673 | drm_dbg_core(dev, "event on vblank count %llu, current %llu, crtc %u\n",drm_dev_dbg((dev)->dev, DRM_UT_CORE, "event on vblank count %llu, current %llu, crtc %u\n" , req_seq, seq, pipe) |
1674 | req_seq, seq, pipe)drm_dev_dbg((dev)->dev, DRM_UT_CORE, "event on vblank count %llu, current %llu, crtc %u\n" , req_seq, seq, pipe); |
1675 | |
1676 | trace_drm_vblank_event_queued(file_priv, pipe, req_seq); |
1677 | |
1678 | e->sequence = req_seq; |
1679 | if (drm_vblank_passed(seq, req_seq)) { |
1680 | drm_vblank_put(dev, pipe); |
1681 | send_vblank_event(dev, e, seq, now); |
1682 | vblwait->reply.sequence = seq; |
1683 | } else { |
1684 | /* drm_handle_vblank_events will call drm_vblank_put */ |
1685 | list_add_tail(&e->base.link, &dev->vblank_event_list); |
1686 | vblwait->reply.sequence = req_seq; |
1687 | } |
1688 | |
1689 | spin_unlock_irq(&dev->event_lock)mtx_leave(&dev->event_lock); |
1690 | |
1691 | return 0; |
1692 | |
1693 | err_unlock: |
1694 | spin_unlock_irq(&dev->event_lock)mtx_leave(&dev->event_lock); |
1695 | kfree(e); |
1696 | err_put: |
1697 | drm_vblank_put(dev, pipe); |
1698 | return ret; |
1699 | } |
1700 | |
1701 | static bool_Bool drm_wait_vblank_is_query(union drm_wait_vblank *vblwait) |
1702 | { |
1703 | if (vblwait->request.sequence) |
1704 | return false0; |
1705 | |
1706 | return _DRM_VBLANK_RELATIVE == |
1707 | (vblwait->request.type & (_DRM_VBLANK_TYPES_MASK(_DRM_VBLANK_ABSOLUTE | _DRM_VBLANK_RELATIVE) | |
1708 | _DRM_VBLANK_EVENT | |
1709 | _DRM_VBLANK_NEXTONMISS)); |
1710 | } |
1711 | |
1712 | /* |
1713 | * Widen a 32-bit param to 64-bits. |
1714 | * |
1715 | * \param narrow 32-bit value (missing upper 32 bits) |
1716 | * \param near 64-bit value that should be 'close' to near |
1717 | * |
1718 | * This function returns a 64-bit value using the lower 32-bits from |
1719 | * 'narrow' and constructing the upper 32-bits so that the result is |
1720 | * as close as possible to 'near'. |
1721 | */ |
1722 | |
1723 | static u64 widen_32_to_64(u32 narrow, u64 near) |
1724 | { |
1725 | return near + (s32) (narrow - near); |
1726 | } |
1727 | |
1728 | static void drm_wait_vblank_reply(struct drm_device *dev, unsigned int pipe, |
1729 | struct drm_wait_vblank_reply *reply) |
1730 | { |
1731 | ktime_t now; |
1732 | struct timespec64 ts; |
1733 | |
1734 | /* |
1735 | * drm_wait_vblank_reply is a UAPI structure that uses 'long' |
1736 | * to store the seconds. This is safe as we always use monotonic |
1737 | * timestamps since linux-4.15. |
1738 | */ |
1739 | reply->sequence = drm_vblank_count_and_time(dev, pipe, &now); |
1740 | ts = ktime_to_timespec64(now); |
1741 | reply->tval_sec = (u32)ts.tv_sec; |
1742 | reply->tval_usec = ts.tv_nsec / 1000; |
1743 | } |
1744 | |
1745 | int drm_wait_vblank_ioctl(struct drm_device *dev, void *data, |
1746 | struct drm_file *file_priv) |
1747 | { |
1748 | struct drm_crtc *crtc; |
1749 | struct drm_vblank_crtc *vblank; |
1750 | union drm_wait_vblank *vblwait = data; |
1751 | int ret; |
1752 | u64 req_seq, seq; |
1753 | unsigned int pipe_index; |
1754 | unsigned int flags, pipe, high_pipe; |
1755 | |
1756 | if (!dev->irq_enabled) |
1757 | return -EOPNOTSUPP45; |
1758 | |
1759 | if (vblwait->request.type & _DRM_VBLANK_SIGNAL) |
1760 | return -EINVAL22; |
1761 | |
1762 | if (vblwait->request.type & |
1763 | ~(_DRM_VBLANK_TYPES_MASK(_DRM_VBLANK_ABSOLUTE | _DRM_VBLANK_RELATIVE) | _DRM_VBLANK_FLAGS_MASK(_DRM_VBLANK_EVENT | _DRM_VBLANK_SIGNAL | _DRM_VBLANK_SECONDARY | _DRM_VBLANK_NEXTONMISS) | |
1764 | _DRM_VBLANK_HIGH_CRTC_MASK)) { |
1765 | drm_dbg_core(dev,drm_dev_dbg((dev)->dev, DRM_UT_CORE, "Unsupported type value 0x%x, supported mask 0x%x\n" , vblwait->request.type, ((_DRM_VBLANK_ABSOLUTE | _DRM_VBLANK_RELATIVE ) | (_DRM_VBLANK_EVENT | _DRM_VBLANK_SIGNAL | _DRM_VBLANK_SECONDARY | _DRM_VBLANK_NEXTONMISS) | _DRM_VBLANK_HIGH_CRTC_MASK)) |
1766 | "Unsupported type value 0x%x, supported mask 0x%x\n",drm_dev_dbg((dev)->dev, DRM_UT_CORE, "Unsupported type value 0x%x, supported mask 0x%x\n" , vblwait->request.type, ((_DRM_VBLANK_ABSOLUTE | _DRM_VBLANK_RELATIVE ) | (_DRM_VBLANK_EVENT | _DRM_VBLANK_SIGNAL | _DRM_VBLANK_SECONDARY | _DRM_VBLANK_NEXTONMISS) | _DRM_VBLANK_HIGH_CRTC_MASK)) |
1767 | vblwait->request.type,drm_dev_dbg((dev)->dev, DRM_UT_CORE, "Unsupported type value 0x%x, supported mask 0x%x\n" , vblwait->request.type, ((_DRM_VBLANK_ABSOLUTE | _DRM_VBLANK_RELATIVE ) | (_DRM_VBLANK_EVENT | _DRM_VBLANK_SIGNAL | _DRM_VBLANK_SECONDARY | _DRM_VBLANK_NEXTONMISS) | _DRM_VBLANK_HIGH_CRTC_MASK)) |
1768 | (_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK |drm_dev_dbg((dev)->dev, DRM_UT_CORE, "Unsupported type value 0x%x, supported mask 0x%x\n" , vblwait->request.type, ((_DRM_VBLANK_ABSOLUTE | _DRM_VBLANK_RELATIVE ) | (_DRM_VBLANK_EVENT | _DRM_VBLANK_SIGNAL | _DRM_VBLANK_SECONDARY | _DRM_VBLANK_NEXTONMISS) | _DRM_VBLANK_HIGH_CRTC_MASK)) |
1769 | _DRM_VBLANK_HIGH_CRTC_MASK))drm_dev_dbg((dev)->dev, DRM_UT_CORE, "Unsupported type value 0x%x, supported mask 0x%x\n" , vblwait->request.type, ((_DRM_VBLANK_ABSOLUTE | _DRM_VBLANK_RELATIVE ) | (_DRM_VBLANK_EVENT | _DRM_VBLANK_SIGNAL | _DRM_VBLANK_SECONDARY | _DRM_VBLANK_NEXTONMISS) | _DRM_VBLANK_HIGH_CRTC_MASK)); |
1770 | return -EINVAL22; |
1771 | } |
1772 | |
1773 | flags = vblwait->request.type & _DRM_VBLANK_FLAGS_MASK(_DRM_VBLANK_EVENT | _DRM_VBLANK_SIGNAL | _DRM_VBLANK_SECONDARY | _DRM_VBLANK_NEXTONMISS); |
1774 | high_pipe = (vblwait->request.type & _DRM_VBLANK_HIGH_CRTC_MASK); |
1775 | if (high_pipe) |
1776 | pipe_index = high_pipe >> _DRM_VBLANK_HIGH_CRTC_SHIFT1; |
1777 | else |
1778 | pipe_index = flags & _DRM_VBLANK_SECONDARY ? 1 : 0; |
1779 | |
1780 | /* Convert lease-relative crtc index into global crtc index */ |
1781 | if (drm_core_check_feature(dev, DRIVER_MODESET)) { |
1782 | pipe = 0; |
1783 | drm_for_each_crtc(crtc, dev)for (crtc = ({ const __typeof( ((__typeof(*crtc) *)0)->head ) *__mptr = ((&(dev)->mode_config.crtc_list)->next ); (__typeof(*crtc) *)( (char *)__mptr - __builtin_offsetof(__typeof (*crtc), head) );}); &crtc->head != (&(dev)->mode_config .crtc_list); crtc = ({ const __typeof( ((__typeof(*crtc) *)0) ->head ) *__mptr = (crtc->head.next); (__typeof(*crtc) * )( (char *)__mptr - __builtin_offsetof(__typeof(*crtc), head) );})) { |
1784 | if (drm_lease_held(file_priv, crtc->base.id)(1)) { |
1785 | if (pipe_index == 0) |
1786 | break; |
1787 | pipe_index--; |
1788 | } |
1789 | pipe++; |
1790 | } |
1791 | } else { |
1792 | pipe = pipe_index; |
1793 | } |
1794 | |
1795 | if (pipe >= dev->num_crtcs) |
1796 | return -EINVAL22; |
1797 | |
1798 | vblank = &dev->vblank[pipe]; |
1799 | |
1800 | /* If the counter is currently enabled and accurate, short-circuit |
1801 | * queries to return the cached timestamp of the last vblank. |
1802 | */ |
1803 | if (dev->vblank_disable_immediate && |
1804 | drm_wait_vblank_is_query(vblwait) && |
1805 | READ_ONCE(vblank->enabled)({ typeof(vblank->enabled) __tmp = *(volatile typeof(vblank ->enabled) *)&(vblank->enabled); membar_datadep_consumer (); __tmp; })) { |
1806 | drm_wait_vblank_reply(dev, pipe, &vblwait->reply); |
1807 | return 0; |
1808 | } |
1809 | |
1810 | ret = drm_vblank_get(dev, pipe); |
1811 | if (ret) { |
1812 | drm_dbg_core(dev,drm_dev_dbg((dev)->dev, DRM_UT_CORE, "crtc %d failed to acquire vblank counter, %d\n" , pipe, ret) |
1813 | "crtc %d failed to acquire vblank counter, %d\n",drm_dev_dbg((dev)->dev, DRM_UT_CORE, "crtc %d failed to acquire vblank counter, %d\n" , pipe, ret) |
1814 | pipe, ret)drm_dev_dbg((dev)->dev, DRM_UT_CORE, "crtc %d failed to acquire vblank counter, %d\n" , pipe, ret); |
1815 | return ret; |
1816 | } |
1817 | seq = drm_vblank_count(dev, pipe); |
1818 | |
1819 | switch (vblwait->request.type & _DRM_VBLANK_TYPES_MASK(_DRM_VBLANK_ABSOLUTE | _DRM_VBLANK_RELATIVE)) { |
1820 | case _DRM_VBLANK_RELATIVE: |
1821 | req_seq = seq + vblwait->request.sequence; |
1822 | vblwait->request.sequence = req_seq; |
1823 | vblwait->request.type &= ~_DRM_VBLANK_RELATIVE; |
1824 | break; |
1825 | case _DRM_VBLANK_ABSOLUTE: |
1826 | req_seq = widen_32_to_64(vblwait->request.sequence, seq); |
1827 | break; |
1828 | default: |
1829 | ret = -EINVAL22; |
1830 | goto done; |
1831 | } |
1832 | |
1833 | if ((flags & _DRM_VBLANK_NEXTONMISS) && |
1834 | drm_vblank_passed(seq, req_seq)) { |
1835 | req_seq = seq + 1; |
1836 | vblwait->request.type &= ~_DRM_VBLANK_NEXTONMISS; |
1837 | vblwait->request.sequence = req_seq; |
1838 | } |
1839 | |
1840 | if (flags & _DRM_VBLANK_EVENT) { |
1841 | /* must hold on to the vblank ref until the event fires |
1842 | * drm_vblank_put will be called asynchronously |
1843 | */ |
1844 | return drm_queue_vblank_event(dev, pipe, req_seq, vblwait, file_priv); |
1845 | } |
1846 | |
1847 | if (req_seq != seq) { |
1848 | int wait; |
1849 | |
1850 | drm_dbg_core(dev, "waiting on vblank count %llu, crtc %u\n",drm_dev_dbg((dev)->dev, DRM_UT_CORE, "waiting on vblank count %llu, crtc %u\n" , req_seq, pipe) |
1851 | req_seq, pipe)drm_dev_dbg((dev)->dev, DRM_UT_CORE, "waiting on vblank count %llu, crtc %u\n" , req_seq, pipe); |
1852 | wait = wait_event_interruptible_timeout(vblank->queue,({ long __ret = (((uint64_t)(3000)) * hz / 1000); if (!(drm_vblank_passed (drm_vblank_count(dev, pipe), req_seq) || !({ typeof(vblank-> enabled) __tmp = *(volatile typeof(vblank->enabled) *)& (vblank->enabled); membar_datadep_consumer(); __tmp; }))) __ret = ({ long ret = (((uint64_t)(3000)) * hz / 1000); do { int __error ; unsigned long deadline; ((!cold) ? (void)0 : __assert("diagnostic " , "/usr/src/sys/dev/pci/drm/drm_vblank.c", 1855, "!cold")); mtx_enter (&sch_mtx); deadline = jiffies + ret; __error = msleep(& vblank->queue, &sch_mtx, 0x100, "drmweti", ret); ret = deadline - jiffies; if (__error == -1 || __error == 4) { ret = -4; mtx_leave(&sch_mtx); break; } if (((((uint64_t)(3000 )) * hz / 1000)) > 0 && (ret <= 0 || __error == 35)) { mtx_leave(&sch_mtx); ret = ((drm_vblank_passed(drm_vblank_count (dev, pipe), req_seq) || !({ typeof(vblank->enabled) __tmp = *(volatile typeof(vblank->enabled) *)&(vblank->enabled ); membar_datadep_consumer(); __tmp; }))) ? 1 : 0; break; } mtx_leave (&sch_mtx); } while (ret > 0 && !(drm_vblank_passed (drm_vblank_count(dev, pipe), req_seq) || !({ typeof(vblank-> enabled) __tmp = *(volatile typeof(vblank->enabled) *)& (vblank->enabled); membar_datadep_consumer(); __tmp; }))); ret; }); __ret; }) |
1853 | drm_vblank_passed(drm_vblank_count(dev, pipe), req_seq) ||({ long __ret = (((uint64_t)(3000)) * hz / 1000); if (!(drm_vblank_passed (drm_vblank_count(dev, pipe), req_seq) || !({ typeof(vblank-> enabled) __tmp = *(volatile typeof(vblank->enabled) *)& (vblank->enabled); membar_datadep_consumer(); __tmp; }))) __ret = ({ long ret = (((uint64_t)(3000)) * hz / 1000); do { int __error ; unsigned long deadline; ((!cold) ? (void)0 : __assert("diagnostic " , "/usr/src/sys/dev/pci/drm/drm_vblank.c", 1855, "!cold")); mtx_enter (&sch_mtx); deadline = jiffies + ret; __error = msleep(& vblank->queue, &sch_mtx, 0x100, "drmweti", ret); ret = deadline - jiffies; if (__error == -1 || __error == 4) { ret = -4; mtx_leave(&sch_mtx); break; } if (((((uint64_t)(3000 )) * hz / 1000)) > 0 && (ret <= 0 || __error == 35)) { mtx_leave(&sch_mtx); ret = ((drm_vblank_passed(drm_vblank_count (dev, pipe), req_seq) || !({ typeof(vblank->enabled) __tmp = *(volatile typeof(vblank->enabled) *)&(vblank->enabled ); membar_datadep_consumer(); __tmp; }))) ? 1 : 0; break; } mtx_leave (&sch_mtx); } while (ret > 0 && !(drm_vblank_passed (drm_vblank_count(dev, pipe), req_seq) || !({ typeof(vblank-> enabled) __tmp = *(volatile typeof(vblank->enabled) *)& (vblank->enabled); membar_datadep_consumer(); __tmp; }))); ret; }); __ret; }) |
1854 | !READ_ONCE(vblank->enabled),({ long __ret = (((uint64_t)(3000)) * hz / 1000); if (!(drm_vblank_passed (drm_vblank_count(dev, pipe), req_seq) || !({ typeof(vblank-> enabled) __tmp = *(volatile typeof(vblank->enabled) *)& (vblank->enabled); membar_datadep_consumer(); __tmp; }))) __ret = ({ long ret = (((uint64_t)(3000)) * hz / 1000); do { int __error ; unsigned long deadline; ((!cold) ? (void)0 : __assert("diagnostic " , "/usr/src/sys/dev/pci/drm/drm_vblank.c", 1855, "!cold")); mtx_enter (&sch_mtx); deadline = jiffies + ret; __error = msleep(& vblank->queue, &sch_mtx, 0x100, "drmweti", ret); ret = deadline - jiffies; if (__error == -1 || __error == 4) { ret = -4; mtx_leave(&sch_mtx); break; } if (((((uint64_t)(3000 )) * hz / 1000)) > 0 && (ret <= 0 || __error == 35)) { mtx_leave(&sch_mtx); ret = ((drm_vblank_passed(drm_vblank_count (dev, pipe), req_seq) || !({ typeof(vblank->enabled) __tmp = *(volatile typeof(vblank->enabled) *)&(vblank->enabled ); membar_datadep_consumer(); __tmp; }))) ? 1 : 0; break; } mtx_leave (&sch_mtx); } while (ret > 0 && !(drm_vblank_passed (drm_vblank_count(dev, pipe), req_seq) || !({ typeof(vblank-> enabled) __tmp = *(volatile typeof(vblank->enabled) *)& (vblank->enabled); membar_datadep_consumer(); __tmp; }))); ret; }); __ret; }) |
1855 | msecs_to_jiffies(3000))({ long __ret = (((uint64_t)(3000)) * hz / 1000); if (!(drm_vblank_passed (drm_vblank_count(dev, pipe), req_seq) || !({ typeof(vblank-> enabled) __tmp = *(volatile typeof(vblank->enabled) *)& (vblank->enabled); membar_datadep_consumer(); __tmp; }))) __ret = ({ long ret = (((uint64_t)(3000)) * hz / 1000); do { int __error ; unsigned long deadline; ((!cold) ? (void)0 : __assert("diagnostic " , "/usr/src/sys/dev/pci/drm/drm_vblank.c", 1855, "!cold")); mtx_enter (&sch_mtx); deadline = jiffies + ret; __error = msleep(& vblank->queue, &sch_mtx, 0x100, "drmweti", ret); ret = deadline - jiffies; if (__error == -1 || __error == 4) { ret = -4; mtx_leave(&sch_mtx); break; } if (((((uint64_t)(3000 )) * hz / 1000)) > 0 && (ret <= 0 || __error == 35)) { mtx_leave(&sch_mtx); ret = ((drm_vblank_passed(drm_vblank_count (dev, pipe), req_seq) || !({ typeof(vblank->enabled) __tmp = *(volatile typeof(vblank->enabled) *)&(vblank->enabled ); membar_datadep_consumer(); __tmp; }))) ? 1 : 0; break; } mtx_leave (&sch_mtx); } while (ret > 0 && !(drm_vblank_passed (drm_vblank_count(dev, pipe), req_seq) || !({ typeof(vblank-> enabled) __tmp = *(volatile typeof(vblank->enabled) *)& (vblank->enabled); membar_datadep_consumer(); __tmp; }))); ret; }); __ret; }); |
1856 | |
1857 | switch (wait) { |
1858 | case 0: |
1859 | /* timeout */ |
1860 | ret = -EBUSY16; |
1861 | break; |
1862 | case -ERESTARTSYS4: |
1863 | /* interrupted by signal */ |
1864 | ret = -EINTR4; |
1865 | break; |
1866 | default: |
1867 | ret = 0; |
1868 | break; |
1869 | } |
1870 | } |
1871 | |
1872 | if (ret != -EINTR4) { |
1873 | drm_wait_vblank_reply(dev, pipe, &vblwait->reply); |
1874 | |
1875 | drm_dbg_core(dev, "crtc %d returning %u to client\n",drm_dev_dbg((dev)->dev, DRM_UT_CORE, "crtc %d returning %u to client\n" , pipe, vblwait->reply.sequence) |
1876 | pipe, vblwait->reply.sequence)drm_dev_dbg((dev)->dev, DRM_UT_CORE, "crtc %d returning %u to client\n" , pipe, vblwait->reply.sequence); |
1877 | } else { |
1878 | drm_dbg_core(dev, "crtc %d vblank wait interrupted by signal\n",drm_dev_dbg((dev)->dev, DRM_UT_CORE, "crtc %d vblank wait interrupted by signal\n" , pipe) |
1879 | pipe)drm_dev_dbg((dev)->dev, DRM_UT_CORE, "crtc %d vblank wait interrupted by signal\n" , pipe); |
1880 | } |
1881 | |
1882 | done: |
1883 | drm_vblank_put(dev, pipe); |
1884 | return ret; |
1885 | } |
1886 | |
1887 | static void drm_handle_vblank_events(struct drm_device *dev, unsigned int pipe) |
1888 | { |
1889 | struct drm_crtc *crtc = drm_crtc_from_index(dev, pipe); |
1890 | bool_Bool high_prec = false0; |
1891 | struct drm_pending_vblank_event *e, *t; |
1892 | ktime_t now; |
1893 | u64 seq; |
1894 | |
1895 | assert_spin_locked(&dev->event_lock)do { if (((&dev->event_lock)->mtx_owner != ({struct cpu_info *__ci; asm volatile("movq %%gs:%P1,%0" : "=r" (__ci ) :"n" (__builtin_offsetof(struct cpu_info, ci_self))); __ci; })) && !(panicstr || db_active)) panic("mutex %p not held in %s" , (&dev->event_lock), __func__); } while (0); |
1896 | |
1897 | seq = drm_vblank_count_and_time(dev, pipe, &now); |
1898 | |
1899 | list_for_each_entry_safe(e, t, &dev->vblank_event_list, base.link)for (e = ({ const __typeof( ((__typeof(*e) *)0)->base.link ) *__mptr = ((&dev->vblank_event_list)->next); (__typeof (*e) *)( (char *)__mptr - __builtin_offsetof(__typeof(*e), base .link) );}), t = ({ const __typeof( ((__typeof(*e) *)0)->base .link ) *__mptr = (e->base.link.next); (__typeof(*e) *)( ( char *)__mptr - __builtin_offsetof(__typeof(*e), base.link) ) ;}); &e->base.link != (&dev->vblank_event_list) ; e = t, t = ({ const __typeof( ((__typeof(*t) *)0)->base. link ) *__mptr = (t->base.link.next); (__typeof(*t) *)( (char *)__mptr - __builtin_offsetof(__typeof(*t), base.link) );})) { |
1900 | if (e->pipe != pipe) |
1901 | continue; |
1902 | if (!drm_vblank_passed(seq, e->sequence)) |
1903 | continue; |
1904 | |
1905 | drm_dbg_core(dev, "vblank event on %llu, current %llu\n",drm_dev_dbg((dev)->dev, DRM_UT_CORE, "vblank event on %llu, current %llu\n" , e->sequence, seq) |
1906 | e->sequence, seq)drm_dev_dbg((dev)->dev, DRM_UT_CORE, "vblank event on %llu, current %llu\n" , e->sequence, seq); |
1907 | |
1908 | list_del(&e->base.link); |
1909 | drm_vblank_put(dev, pipe); |
1910 | send_vblank_event(dev, e, seq, now); |
1911 | } |
1912 | |
1913 | if (crtc && crtc->funcs->get_vblank_timestamp) |
1914 | high_prec = true1; |
Value stored to 'high_prec' is never read | |
1915 | |
1916 | trace_drm_vblank_event(pipe, seq, now, high_prec); |
1917 | } |
1918 | |
1919 | /** |
1920 | * drm_handle_vblank - handle a vblank event |
1921 | * @dev: DRM device |
1922 | * @pipe: index of CRTC where this event occurred |
1923 | * |
1924 | * Drivers should call this routine in their vblank interrupt handlers to |
1925 | * update the vblank counter and send any signals that may be pending. |
1926 | * |
1927 | * This is the legacy version of drm_crtc_handle_vblank(). |
1928 | */ |
1929 | bool_Bool drm_handle_vblank(struct drm_device *dev, unsigned int pipe) |
1930 | { |
1931 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
1932 | unsigned long irqflags; |
1933 | bool_Bool disable_irq; |
1934 | |
1935 | if (drm_WARN_ON_ONCE(dev, !drm_dev_has_vblank(dev))({ static int __warned; int __ret = !!((!drm_dev_has_vblank(dev ))); if (__ret && !__warned) { printf("%s %s: " "%s", dev_driver_string(((dev))->dev), "", "drm_WARN_ON_ONCE(" "!drm_dev_has_vblank(dev)" ")"); __warned = 1; } __builtin_expect(!!(__ret), 0); })) |
1936 | return false0; |
1937 | |
1938 | if (drm_WARN_ON(dev, pipe >= dev->num_crtcs)({ int __ret = !!((pipe >= dev->num_crtcs)); if (__ret) printf("%s %s: " "%s", dev_driver_string(((dev))->dev), "" , "drm_WARN_ON(" "pipe >= dev->num_crtcs" ")"); __builtin_expect (!!(__ret), 0); })) |
1939 | return false0; |
1940 | |
1941 | spin_lock_irqsave(&dev->event_lock, irqflags)do { irqflags = 0; mtx_enter(&dev->event_lock); } while (0); |
1942 | |
1943 | /* Need timestamp lock to prevent concurrent execution with |
1944 | * vblank enable/disable, as this would cause inconsistent |
1945 | * or corrupted timestamps and vblank counts. |
1946 | */ |
1947 | spin_lock(&dev->vblank_time_lock)mtx_enter(&dev->vblank_time_lock); |
1948 | |
1949 | /* Vblank irq handling disabled. Nothing to do. */ |
1950 | if (!vblank->enabled) { |
1951 | spin_unlock(&dev->vblank_time_lock)mtx_leave(&dev->vblank_time_lock); |
1952 | spin_unlock_irqrestore(&dev->event_lock, irqflags)do { (void)(irqflags); mtx_leave(&dev->event_lock); } while (0); |
1953 | return false0; |
1954 | } |
1955 | |
1956 | drm_update_vblank_count(dev, pipe, true1); |
1957 | |
1958 | spin_unlock(&dev->vblank_time_lock)mtx_leave(&dev->vblank_time_lock); |
1959 | |
1960 | wake_up(&vblank->queue); |
1961 | |
1962 | /* With instant-off, we defer disabling the interrupt until after |
1963 | * we finish processing the following vblank after all events have |
1964 | * been signaled. The disable has to be last (after |
1965 | * drm_handle_vblank_events) so that the timestamp is always accurate. |
1966 | */ |
1967 | disable_irq = (dev->vblank_disable_immediate && |
1968 | drm_vblank_offdelay > 0 && |
1969 | !atomic_read(&vblank->refcount)({ typeof(*(&vblank->refcount)) __tmp = *(volatile typeof (*(&vblank->refcount)) *)&(*(&vblank->refcount )); membar_datadep_consumer(); __tmp; })); |
1970 | |
1971 | drm_handle_vblank_events(dev, pipe); |
1972 | drm_handle_vblank_works(vblank); |
1973 | |
1974 | spin_unlock_irqrestore(&dev->event_lock, irqflags)do { (void)(irqflags); mtx_leave(&dev->event_lock); } while (0); |
1975 | |
1976 | if (disable_irq) |
1977 | vblank_disable_fn(vblank); |
1978 | |
1979 | return true1; |
1980 | } |
1981 | EXPORT_SYMBOL(drm_handle_vblank); |
1982 | |
1983 | /** |
1984 | * drm_crtc_handle_vblank - handle a vblank event |
1985 | * @crtc: where this event occurred |
1986 | * |
1987 | * Drivers should call this routine in their vblank interrupt handlers to |
1988 | * update the vblank counter and send any signals that may be pending. |
1989 | * |
1990 | * This is the native KMS version of drm_handle_vblank(). |
1991 | * |
1992 | * Note that for a given vblank counter value drm_crtc_handle_vblank() |
1993 | * and drm_crtc_vblank_count() or drm_crtc_vblank_count_and_time() |
1994 | * provide a barrier: Any writes done before calling |
1995 | * drm_crtc_handle_vblank() will be visible to callers of the later |
1996 | * functions, iff the vblank count is the same or a later one. |
1997 | * |
1998 | * See also &drm_vblank_crtc.count. |
1999 | * |
2000 | * Returns: |
2001 | * True if the event was successfully handled, false on failure. |
2002 | */ |
2003 | bool_Bool drm_crtc_handle_vblank(struct drm_crtc *crtc) |
2004 | { |
2005 | return drm_handle_vblank(crtc->dev, drm_crtc_index(crtc)); |
2006 | } |
2007 | EXPORT_SYMBOL(drm_crtc_handle_vblank); |
2008 | |
2009 | /* |
2010 | * Get crtc VBLANK count. |
2011 | * |
2012 | * \param dev DRM device |
2013 | * \param data user arguement, pointing to a drm_crtc_get_sequence structure. |
2014 | * \param file_priv drm file private for the user's open file descriptor |
2015 | */ |
2016 | |
2017 | int drm_crtc_get_sequence_ioctl(struct drm_device *dev, void *data, |
2018 | struct drm_file *file_priv) |
2019 | { |
2020 | struct drm_crtc *crtc; |
2021 | struct drm_vblank_crtc *vblank; |
2022 | int pipe; |
2023 | struct drm_crtc_get_sequence *get_seq = data; |
2024 | ktime_t now; |
2025 | bool_Bool vblank_enabled; |
2026 | int ret; |
2027 | |
2028 | if (!drm_core_check_feature(dev, DRIVER_MODESET)) |
2029 | return -EOPNOTSUPP45; |
2030 | |
2031 | if (!dev->irq_enabled) |
2032 | return -EOPNOTSUPP45; |
2033 | |
2034 | crtc = drm_crtc_find(dev, file_priv, get_seq->crtc_id); |
2035 | if (!crtc) |
2036 | return -ENOENT2; |
2037 | |
2038 | pipe = drm_crtc_index(crtc); |
2039 | |
2040 | vblank = &dev->vblank[pipe]; |
2041 | vblank_enabled = dev->vblank_disable_immediate && READ_ONCE(vblank->enabled)({ typeof(vblank->enabled) __tmp = *(volatile typeof(vblank ->enabled) *)&(vblank->enabled); membar_datadep_consumer (); __tmp; }); |
2042 | |
2043 | if (!vblank_enabled) { |
2044 | ret = drm_crtc_vblank_get(crtc); |
2045 | if (ret) { |
2046 | drm_dbg_core(dev,drm_dev_dbg((dev)->dev, DRM_UT_CORE, "crtc %d failed to acquire vblank counter, %d\n" , pipe, ret) |
2047 | "crtc %d failed to acquire vblank counter, %d\n",drm_dev_dbg((dev)->dev, DRM_UT_CORE, "crtc %d failed to acquire vblank counter, %d\n" , pipe, ret) |
2048 | pipe, ret)drm_dev_dbg((dev)->dev, DRM_UT_CORE, "crtc %d failed to acquire vblank counter, %d\n" , pipe, ret); |
2049 | return ret; |
2050 | } |
2051 | } |
2052 | drm_modeset_lock(&crtc->mutex, NULL((void *)0)); |
2053 | if (crtc->state) |
2054 | get_seq->active = crtc->state->enable; |
2055 | else |
2056 | get_seq->active = crtc->enabled; |
2057 | drm_modeset_unlock(&crtc->mutex); |
2058 | get_seq->sequence = drm_vblank_count_and_time(dev, pipe, &now); |
2059 | get_seq->sequence_ns = ktime_to_ns(now); |
2060 | if (!vblank_enabled) |
2061 | drm_crtc_vblank_put(crtc); |
2062 | return 0; |
2063 | } |
2064 | |
2065 | /* |
2066 | * Queue a event for VBLANK sequence |
2067 | * |
2068 | * \param dev DRM device |
2069 | * \param data user arguement, pointing to a drm_crtc_queue_sequence structure. |
2070 | * \param file_priv drm file private for the user's open file descriptor |
2071 | */ |
2072 | |
2073 | int drm_crtc_queue_sequence_ioctl(struct drm_device *dev, void *data, |
2074 | struct drm_file *file_priv) |
2075 | { |
2076 | struct drm_crtc *crtc; |
2077 | struct drm_vblank_crtc *vblank; |
2078 | int pipe; |
2079 | struct drm_crtc_queue_sequence *queue_seq = data; |
2080 | ktime_t now; |
2081 | struct drm_pending_vblank_event *e; |
2082 | u32 flags; |
2083 | u64 seq; |
2084 | u64 req_seq; |
2085 | int ret; |
2086 | |
2087 | if (!drm_core_check_feature(dev, DRIVER_MODESET)) |
2088 | return -EOPNOTSUPP45; |
2089 | |
2090 | if (!dev->irq_enabled) |
2091 | return -EOPNOTSUPP45; |
2092 | |
2093 | crtc = drm_crtc_find(dev, file_priv, queue_seq->crtc_id); |
2094 | if (!crtc) |
2095 | return -ENOENT2; |
2096 | |
2097 | flags = queue_seq->flags; |
2098 | /* Check valid flag bits */ |
2099 | if (flags & ~(DRM_CRTC_SEQUENCE_RELATIVE0x00000001| |
2100 | DRM_CRTC_SEQUENCE_NEXT_ON_MISS0x00000002)) |
2101 | return -EINVAL22; |
2102 | |
2103 | pipe = drm_crtc_index(crtc); |
2104 | |
2105 | vblank = &dev->vblank[pipe]; |
2106 | |
2107 | e = kzalloc(sizeof(*e), GFP_KERNEL(0x0001 | 0x0004)); |
2108 | if (e == NULL((void *)0)) |
2109 | return -ENOMEM12; |
2110 | |
2111 | ret = drm_crtc_vblank_get(crtc); |
2112 | if (ret) { |
2113 | drm_dbg_core(dev,drm_dev_dbg((dev)->dev, DRM_UT_CORE, "crtc %d failed to acquire vblank counter, %d\n" , pipe, ret) |
2114 | "crtc %d failed to acquire vblank counter, %d\n",drm_dev_dbg((dev)->dev, DRM_UT_CORE, "crtc %d failed to acquire vblank counter, %d\n" , pipe, ret) |
2115 | pipe, ret)drm_dev_dbg((dev)->dev, DRM_UT_CORE, "crtc %d failed to acquire vblank counter, %d\n" , pipe, ret); |
2116 | goto err_free; |
2117 | } |
2118 | |
2119 | seq = drm_vblank_count_and_time(dev, pipe, &now); |
2120 | req_seq = queue_seq->sequence; |
2121 | |
2122 | if (flags & DRM_CRTC_SEQUENCE_RELATIVE0x00000001) |
2123 | req_seq += seq; |
2124 | |
2125 | if ((flags & DRM_CRTC_SEQUENCE_NEXT_ON_MISS0x00000002) && drm_vblank_passed(seq, req_seq)) |
2126 | req_seq = seq + 1; |
2127 | |
2128 | e->pipe = pipe; |
2129 | e->event.base.type = DRM_EVENT_CRTC_SEQUENCE0x03; |
2130 | e->event.base.length = sizeof(e->event.seq); |
2131 | e->event.seq.user_data = queue_seq->user_data; |
2132 | |
2133 | spin_lock_irq(&dev->event_lock)mtx_enter(&dev->event_lock); |
2134 | |
2135 | /* |
2136 | * drm_crtc_vblank_off() might have been called after we called |
2137 | * drm_crtc_vblank_get(). drm_crtc_vblank_off() holds event_lock around the |
2138 | * vblank disable, so no need for further locking. The reference from |
2139 | * drm_crtc_vblank_get() protects against vblank disable from another source. |
2140 | */ |
2141 | if (!READ_ONCE(vblank->enabled)({ typeof(vblank->enabled) __tmp = *(volatile typeof(vblank ->enabled) *)&(vblank->enabled); membar_datadep_consumer (); __tmp; })) { |
2142 | ret = -EINVAL22; |
2143 | goto err_unlock; |
2144 | } |
2145 | |
2146 | ret = drm_event_reserve_init_locked(dev, file_priv, &e->base, |
2147 | &e->event.base); |
2148 | |
2149 | if (ret) |
2150 | goto err_unlock; |
2151 | |
2152 | e->sequence = req_seq; |
2153 | |
2154 | if (drm_vblank_passed(seq, req_seq)) { |
2155 | drm_crtc_vblank_put(crtc); |
2156 | send_vblank_event(dev, e, seq, now); |
2157 | queue_seq->sequence = seq; |
2158 | } else { |
2159 | /* drm_handle_vblank_events will call drm_vblank_put */ |
2160 | list_add_tail(&e->base.link, &dev->vblank_event_list); |
2161 | queue_seq->sequence = req_seq; |
2162 | } |
2163 | |
2164 | spin_unlock_irq(&dev->event_lock)mtx_leave(&dev->event_lock); |
2165 | return 0; |
2166 | |
2167 | err_unlock: |
2168 | spin_unlock_irq(&dev->event_lock)mtx_leave(&dev->event_lock); |
2169 | drm_crtc_vblank_put(crtc); |
2170 | err_free: |
2171 | kfree(e); |
2172 | return ret; |
2173 | } |
2174 |