1 /*
2 * Copyright © 2014 Broadcom
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice (including the next
12 * paragraph) shall be included in all copies or substantial portions of the
13 * Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
21 * IN THE SOFTWARE.
22 */
23
24 /**
25 * DOC: Interrupt management for the V3D engine
26 *
27 * We have an interrupt status register (V3D_INTCTL) which reports
28 * interrupts, and where writing 1 bits clears those interrupts.
29 * There are also a pair of interrupt registers
30 * (V3D_INTENA/V3D_INTDIS) where writing a 1 to their bits enables or
31 * disables that specific interrupt, and 0s written are ignored
32 * (reading either one returns the set of enabled interrupts).
33 *
34 * When we take a binning flush done interrupt, we need to submit the
35 * next frame for binning and move the finished frame to the render
36 * thread.
37 *
38 * When we take a render frame interrupt, we need to wake the
39 * processes waiting for some frame to be done, and get the next frame
40 * submitted ASAP (so the hardware doesn't sit idle when there's work
41 * to do).
42 *
43 * When we take the binner out of memory interrupt, we need to
44 * allocate some new memory and pass it to the binner so that the
45 * current job can make progress.
46 */
47
48 #include <linux/platform_device.h>
49
50 #include <drm/drm_drv.h>
51
52 #include "vc4_drv.h"
53 #include "vc4_regs.h"
54 #include "vc4_trace.h"
55
56 #define V3D_DRIVER_IRQS (V3D_INT_OUTOMEM | \
57 V3D_INT_FLDONE | \
58 V3D_INT_FRDONE)
59
60 DECLARE_WAIT_QUEUE_HEAD(render_wait);
61
62 static void
vc4_overflow_mem_work(struct work_struct * work)63 vc4_overflow_mem_work(struct work_struct *work)
64 {
65 struct vc4_dev *vc4 =
66 container_of(work, struct vc4_dev, overflow_mem_work);
67 struct vc4_bo *bo;
68 int bin_bo_slot;
69 struct vc4_exec_info *exec;
70 unsigned long irqflags;
71
72 mutex_lock(&vc4->bin_bo_lock);
73
74 if (!vc4->bin_bo)
75 goto complete;
76
77 bo = vc4->bin_bo;
78
79 bin_bo_slot = vc4_v3d_get_bin_slot(vc4);
80 if (bin_bo_slot < 0) {
81 DRM_ERROR("Couldn't allocate binner overflow mem\n");
82 goto complete;
83 }
84
85 spin_lock_irqsave(&vc4->job_lock, irqflags);
86
87 if (vc4->bin_alloc_overflow) {
88 /* If we had overflow memory allocated previously,
89 * then that chunk will free when the current bin job
90 * is done. If we don't have a bin job running, then
91 * the chunk will be done whenever the list of render
92 * jobs has drained.
93 */
94 exec = vc4_first_bin_job(vc4);
95 if (!exec)
96 exec = vc4_last_render_job(vc4);
97 if (exec) {
98 exec->bin_slots |= vc4->bin_alloc_overflow;
99 } else {
100 /* There's nothing queued in the hardware, so
101 * the old slot is free immediately.
102 */
103 vc4->bin_alloc_used &= ~vc4->bin_alloc_overflow;
104 }
105 }
106 vc4->bin_alloc_overflow = BIT(bin_bo_slot);
107
108 V3D_WRITE(V3D_BPOA, bo->base.dma_addr + bin_bo_slot * vc4->bin_alloc_size);
109 V3D_WRITE(V3D_BPOS, bo->base.base.size);
110 V3D_WRITE(V3D_INTCTL, V3D_INT_OUTOMEM);
111 V3D_WRITE(V3D_INTENA, V3D_INT_OUTOMEM);
112 spin_unlock_irqrestore(&vc4->job_lock, irqflags);
113
114 complete:
115 mutex_unlock(&vc4->bin_bo_lock);
116 }
117
118 static void
vc4_irq_finish_bin_job(struct drm_device * dev)119 vc4_irq_finish_bin_job(struct drm_device *dev)
120 {
121 struct vc4_dev *vc4 = to_vc4_dev(dev);
122 struct vc4_exec_info *next, *exec = vc4_first_bin_job(vc4);
123
124 if (!exec)
125 return;
126
127 trace_vc4_bcl_end_irq(dev, exec->seqno);
128
129 vc4_move_job_to_render(dev, exec);
130 next = vc4_first_bin_job(vc4);
131
132 /* Only submit the next job in the bin list if it matches the perfmon
133 * attached to the one that just finished (or if both jobs don't have
134 * perfmon attached to them).
135 */
136 if (next && next->perfmon == exec->perfmon)
137 vc4_submit_next_bin_job(dev);
138 }
139
140 static void
vc4_cancel_bin_job(struct drm_device * dev)141 vc4_cancel_bin_job(struct drm_device *dev)
142 {
143 struct vc4_dev *vc4 = to_vc4_dev(dev);
144 struct vc4_exec_info *exec = vc4_first_bin_job(vc4);
145
146 if (!exec)
147 return;
148
149 /* Stop the perfmon so that the next bin job can be started. */
150 if (exec->perfmon)
151 vc4_perfmon_stop(vc4, exec->perfmon, false);
152
153 list_move_tail(&exec->head, &vc4->bin_job_list);
154 vc4_submit_next_bin_job(dev);
155 }
156
157 static void
vc4_irq_finish_render_job(struct drm_device * dev)158 vc4_irq_finish_render_job(struct drm_device *dev)
159 {
160 struct vc4_dev *vc4 = to_vc4_dev(dev);
161 struct vc4_exec_info *exec = vc4_first_render_job(vc4);
162 struct vc4_exec_info *nextbin, *nextrender;
163
164 if (!exec)
165 return;
166
167 trace_vc4_rcl_end_irq(dev, exec->seqno);
168
169 vc4->finished_seqno++;
170 list_move_tail(&exec->head, &vc4->job_done_list);
171
172 nextbin = vc4_first_bin_job(vc4);
173 nextrender = vc4_first_render_job(vc4);
174
175 /* Only stop the perfmon if following jobs in the queue don't expect it
176 * to be enabled.
177 */
178 if (exec->perfmon && !nextrender &&
179 (!nextbin || nextbin->perfmon != exec->perfmon))
180 vc4_perfmon_stop(vc4, exec->perfmon, true);
181
182 /* If there's a render job waiting, start it. If this is not the case
183 * we may have to unblock the binner if it's been stalled because of
184 * perfmon (this can be checked by comparing the perfmon attached to
185 * the finished renderjob to the one attached to the next bin job: if
186 * they don't match, this means the binner is stalled and should be
187 * restarted).
188 */
189 if (nextrender)
190 vc4_submit_next_render_job(dev);
191 else if (nextbin && nextbin->perfmon != exec->perfmon)
192 vc4_submit_next_bin_job(dev);
193
194 if (exec->fence) {
195 dma_fence_signal_locked(exec->fence);
196 dma_fence_put(exec->fence);
197 exec->fence = NULL;
198 }
199
200 wake_up_all(&vc4->job_wait_queue);
201 schedule_work(&vc4->job_done_work);
202 }
203
204 static irqreturn_t
vc4_irq(int irq,void * arg)205 vc4_irq(int irq, void *arg)
206 {
207 struct drm_device *dev = arg;
208 struct vc4_dev *vc4 = to_vc4_dev(dev);
209 uint32_t intctl;
210 irqreturn_t status = IRQ_NONE;
211
212 barrier();
213 intctl = V3D_READ(V3D_INTCTL);
214
215 /* Acknowledge the interrupts we're handling here. The binner
216 * last flush / render frame done interrupt will be cleared,
217 * while OUTOMEM will stay high until the underlying cause is
218 * cleared.
219 */
220 V3D_WRITE(V3D_INTCTL, intctl);
221
222 if (intctl & V3D_INT_OUTOMEM) {
223 /* Disable OUTOMEM until the work is done. */
224 V3D_WRITE(V3D_INTDIS, V3D_INT_OUTOMEM);
225 schedule_work(&vc4->overflow_mem_work);
226 status = IRQ_HANDLED;
227 }
228
229 if (intctl & V3D_INT_FLDONE) {
230 spin_lock(&vc4->job_lock);
231 vc4_irq_finish_bin_job(dev);
232 spin_unlock(&vc4->job_lock);
233 status = IRQ_HANDLED;
234 }
235
236 if (intctl & V3D_INT_FRDONE) {
237 spin_lock(&vc4->job_lock);
238 vc4_irq_finish_render_job(dev);
239 spin_unlock(&vc4->job_lock);
240 status = IRQ_HANDLED;
241 }
242
243 return status;
244 }
245
246 static void
vc4_irq_prepare(struct drm_device * dev)247 vc4_irq_prepare(struct drm_device *dev)
248 {
249 struct vc4_dev *vc4 = to_vc4_dev(dev);
250
251 if (!vc4->v3d)
252 return;
253
254 init_waitqueue_head(&vc4->job_wait_queue);
255 INIT_WORK(&vc4->overflow_mem_work, vc4_overflow_mem_work);
256
257 /* Clear any pending interrupts someone might have left around
258 * for us.
259 */
260 V3D_WRITE(V3D_INTCTL, V3D_DRIVER_IRQS);
261 }
262
263 void
vc4_irq_enable(struct drm_device * dev)264 vc4_irq_enable(struct drm_device *dev)
265 {
266 struct vc4_dev *vc4 = to_vc4_dev(dev);
267
268 if (WARN_ON_ONCE(vc4->is_vc5))
269 return;
270
271 if (!vc4->v3d)
272 return;
273
274 /* Enable the render done interrupts. The out-of-memory interrupt is
275 * enabled as soon as we have a binner BO allocated.
276 */
277 V3D_WRITE(V3D_INTENA, V3D_INT_FLDONE | V3D_INT_FRDONE);
278 }
279
280 void
vc4_irq_disable(struct drm_device * dev)281 vc4_irq_disable(struct drm_device *dev)
282 {
283 struct vc4_dev *vc4 = to_vc4_dev(dev);
284
285 if (WARN_ON_ONCE(vc4->is_vc5))
286 return;
287
288 if (!vc4->v3d)
289 return;
290
291 /* Disable sending interrupts for our driver's IRQs. */
292 V3D_WRITE(V3D_INTDIS, V3D_DRIVER_IRQS);
293
294 /* Clear any pending interrupts we might have left. */
295 V3D_WRITE(V3D_INTCTL, V3D_DRIVER_IRQS);
296
297 /* Finish any interrupt handler still in flight. */
298 synchronize_irq(vc4->irq);
299
300 cancel_work_sync(&vc4->overflow_mem_work);
301 }
302
vc4_irq_install(struct drm_device * dev,int irq)303 int vc4_irq_install(struct drm_device *dev, int irq)
304 {
305 struct vc4_dev *vc4 = to_vc4_dev(dev);
306 int ret;
307
308 if (WARN_ON_ONCE(vc4->is_vc5))
309 return -ENODEV;
310
311 if (irq == IRQ_NOTCONNECTED)
312 return -ENOTCONN;
313
314 vc4_irq_prepare(dev);
315
316 ret = request_irq(irq, vc4_irq, 0, dev->driver->name, dev);
317 if (ret)
318 return ret;
319
320 vc4_irq_enable(dev);
321
322 return 0;
323 }
324
vc4_irq_uninstall(struct drm_device * dev)325 void vc4_irq_uninstall(struct drm_device *dev)
326 {
327 struct vc4_dev *vc4 = to_vc4_dev(dev);
328
329 if (WARN_ON_ONCE(vc4->is_vc5))
330 return;
331
332 vc4_irq_disable(dev);
333 free_irq(vc4->irq, dev);
334 }
335
336 /** Reinitializes interrupt registers when a GPU reset is performed. */
vc4_irq_reset(struct drm_device * dev)337 void vc4_irq_reset(struct drm_device *dev)
338 {
339 struct vc4_dev *vc4 = to_vc4_dev(dev);
340 unsigned long irqflags;
341
342 if (WARN_ON_ONCE(vc4->is_vc5))
343 return;
344
345 /* Acknowledge any stale IRQs. */
346 V3D_WRITE(V3D_INTCTL, V3D_DRIVER_IRQS);
347
348 /*
349 * Turn all our interrupts on. Binner out of memory is the
350 * only one we expect to trigger at this point, since we've
351 * just come from poweron and haven't supplied any overflow
352 * memory yet.
353 */
354 V3D_WRITE(V3D_INTENA, V3D_DRIVER_IRQS);
355
356 spin_lock_irqsave(&vc4->job_lock, irqflags);
357 vc4_cancel_bin_job(dev);
358 vc4_irq_finish_render_job(dev);
359 spin_unlock_irqrestore(&vc4->job_lock, irqflags);
360 }
361