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1// SPDX-License-Identifier: GPL-2.0+
2/* Copyright (C) 2014-2018 Broadcom */
3
4/**
5 * DOC: Interrupt management for the V3D engine
6 *
7 * When we take a bin, render, TFU done, or CSD done interrupt, we
8 * need to signal the fence for that job so that the scheduler can
9 * queue up the next one and unblock any waiters.
10 *
11 * When we take the binner out of memory interrupt, we need to
12 * allocate some new memory and pass it to the binner so that the
13 * current job can make progress.
14 */
15
16#include <linux/platform_device.h>
17#include <linux/sched/clock.h>
18
19#include "v3d_drv.h"
20#include "v3d_regs.h"
21#include "v3d_trace.h"
22
23#define V3D_CORE_IRQS(ver) ((u32)(V3D_INT_OUTOMEM | \
24 V3D_INT_FLDONE | \
25 V3D_INT_FRDONE | \
26 V3D_INT_CSDDONE(ver) | \
27 (ver < 71 ? V3D_INT_GMPV : 0)))
28
29#define V3D_HUB_IRQS(ver) ((u32)(V3D_HUB_INT_MMU_WRV | \
30 V3D_HUB_INT_MMU_PTI | \
31 V3D_HUB_INT_MMU_CAP | \
32 V3D_HUB_INT_TFUC | \
33 (ver >= 71 ? V3D_V7_HUB_INT_GMPV : 0)))
34
35static irqreturn_t
36v3d_hub_irq(int irq, void *arg);
37
38static void
39v3d_overflow_mem_work(struct work_struct *work)
40{
41 struct v3d_dev *v3d =
42 container_of(work, struct v3d_dev, overflow_mem_work);
43 struct drm_device *dev = &v3d->drm;
44 struct v3d_bo *bo = v3d_bo_create(dev, NULL /* XXX: GMP */, 256 * 1024);
45 struct drm_gem_object *obj;
46 unsigned long irqflags;
47
48 if (IS_ERR(bo)) {
49 DRM_ERROR("Couldn't allocate binner overflow mem\n");
50 return;
51 }
52 obj = &bo->base.base;
53
54 /* We lost a race, and our work task came in after the bin job
55 * completed and exited. This can happen because the HW
56 * signals OOM before it's fully OOM, so the binner might just
57 * barely complete.
58 *
59 * If we lose the race and our work task comes in after a new
60 * bin job got scheduled, that's fine. We'll just give them
61 * some binner pool anyway.
62 */
63 spin_lock_irqsave(&v3d->job_lock, irqflags);
64 if (!v3d->bin_job) {
65 spin_unlock_irqrestore(&v3d->job_lock, irqflags);
66 goto out;
67 }
68
69 drm_gem_object_get(obj);
70 list_add_tail(&bo->unref_head, &v3d->bin_job->render->unref_list);
71 spin_unlock_irqrestore(&v3d->job_lock, irqflags);
72
73 V3D_CORE_WRITE(0, V3D_PTB_BPOA, bo->node.start << V3D_MMU_PAGE_SHIFT);
74 V3D_CORE_WRITE(0, V3D_PTB_BPOS, obj->size);
75
76out:
77 drm_gem_object_put(obj);
78}
79
80static irqreturn_t
81v3d_irq(int irq, void *arg)
82{
83 struct v3d_dev *v3d = arg;
84 u32 intsts;
85 irqreturn_t status = IRQ_NONE;
86
87 intsts = V3D_CORE_READ(0, V3D_CTL_INT_STS);
88
89 /* Acknowledge the interrupts we're handling here. */
90 V3D_CORE_WRITE(0, V3D_CTL_INT_CLR, intsts);
91
92 if (intsts & V3D_INT_OUTOMEM) {
93 /* Note that the OOM status is edge signaled, so the
94 * interrupt won't happen again until the we actually
95 * add more memory. Also, as of V3D 4.1, FLDONE won't
96 * be reported until any OOM state has been cleared.
97 */
98 schedule_work(&v3d->overflow_mem_work);
99 status = IRQ_HANDLED;
100 }
101
102 if (intsts & V3D_INT_FLDONE) {
103 struct v3d_fence *fence =
104 to_v3d_fence(v3d->bin_job->base.irq_fence);
105 struct v3d_file_priv *file = v3d->bin_job->base.file->driver_priv;
106 u64 runtime = local_clock() - file->start_ns[V3D_BIN];
107
108 file->jobs_sent[V3D_BIN]++;
109 v3d->queue[V3D_BIN].jobs_sent++;
110
111 file->start_ns[V3D_BIN] = 0;
112 v3d->queue[V3D_BIN].start_ns = 0;
113
114 file->enabled_ns[V3D_BIN] += runtime;
115 v3d->queue[V3D_BIN].enabled_ns += runtime;
116
117 trace_v3d_bcl_irq(&v3d->drm, fence->seqno);
118 dma_fence_signal(&fence->base);
119 status = IRQ_HANDLED;
120 }
121
122 if (intsts & V3D_INT_FRDONE) {
123 struct v3d_fence *fence =
124 to_v3d_fence(v3d->render_job->base.irq_fence);
125 struct v3d_file_priv *file = v3d->render_job->base.file->driver_priv;
126 u64 runtime = local_clock() - file->start_ns[V3D_RENDER];
127
128 file->jobs_sent[V3D_RENDER]++;
129 v3d->queue[V3D_RENDER].jobs_sent++;
130
131 file->start_ns[V3D_RENDER] = 0;
132 v3d->queue[V3D_RENDER].start_ns = 0;
133
134 file->enabled_ns[V3D_RENDER] += runtime;
135 v3d->queue[V3D_RENDER].enabled_ns += runtime;
136
137 trace_v3d_rcl_irq(&v3d->drm, fence->seqno);
138 dma_fence_signal(&fence->base);
139 status = IRQ_HANDLED;
140 }
141
142 if (intsts & V3D_INT_CSDDONE(v3d->ver)) {
143 struct v3d_fence *fence =
144 to_v3d_fence(v3d->csd_job->base.irq_fence);
145 struct v3d_file_priv *file = v3d->csd_job->base.file->driver_priv;
146 u64 runtime = local_clock() - file->start_ns[V3D_CSD];
147
148 file->jobs_sent[V3D_CSD]++;
149 v3d->queue[V3D_CSD].jobs_sent++;
150
151 file->start_ns[V3D_CSD] = 0;
152 v3d->queue[V3D_CSD].start_ns = 0;
153
154 file->enabled_ns[V3D_CSD] += runtime;
155 v3d->queue[V3D_CSD].enabled_ns += runtime;
156
157 trace_v3d_csd_irq(&v3d->drm, fence->seqno);
158 dma_fence_signal(&fence->base);
159 status = IRQ_HANDLED;
160 }
161
162 /* We shouldn't be triggering these if we have GMP in
163 * always-allowed mode.
164 */
165 if (v3d->ver < 71 && (intsts & V3D_INT_GMPV))
166 dev_err(v3d->drm.dev, "GMP violation\n");
167
168 /* V3D 4.2 wires the hub and core IRQs together, so if we &
169 * didn't see the common one then check hub for MMU IRQs.
170 */
171 if (v3d->single_irq_line && status == IRQ_NONE)
172 return v3d_hub_irq(irq, arg);
173
174 return status;
175}
176
177static irqreturn_t
178v3d_hub_irq(int irq, void *arg)
179{
180 struct v3d_dev *v3d = arg;
181 u32 intsts;
182 irqreturn_t status = IRQ_NONE;
183
184 intsts = V3D_READ(V3D_HUB_INT_STS);
185
186 /* Acknowledge the interrupts we're handling here. */
187 V3D_WRITE(V3D_HUB_INT_CLR, intsts);
188
189 if (intsts & V3D_HUB_INT_TFUC) {
190 struct v3d_fence *fence =
191 to_v3d_fence(v3d->tfu_job->base.irq_fence);
192 struct v3d_file_priv *file = v3d->tfu_job->base.file->driver_priv;
193 u64 runtime = local_clock() - file->start_ns[V3D_TFU];
194
195 file->jobs_sent[V3D_TFU]++;
196 v3d->queue[V3D_TFU].jobs_sent++;
197
198 file->start_ns[V3D_TFU] = 0;
199 v3d->queue[V3D_TFU].start_ns = 0;
200
201 file->enabled_ns[V3D_TFU] += runtime;
202 v3d->queue[V3D_TFU].enabled_ns += runtime;
203
204 trace_v3d_tfu_irq(&v3d->drm, fence->seqno);
205 dma_fence_signal(&fence->base);
206 status = IRQ_HANDLED;
207 }
208
209 if (intsts & (V3D_HUB_INT_MMU_WRV |
210 V3D_HUB_INT_MMU_PTI |
211 V3D_HUB_INT_MMU_CAP)) {
212 u32 axi_id = V3D_READ(V3D_MMU_VIO_ID);
213 u64 vio_addr = ((u64)V3D_READ(V3D_MMU_VIO_ADDR) <<
214 (v3d->va_width - 32));
215 static const char *const v3d41_axi_ids[] = {
216 "L2T",
217 "PTB",
218 "PSE",
219 "TLB",
220 "CLE",
221 "TFU",
222 "MMU",
223 "GMP",
224 };
225 const char *client = "?";
226
227 V3D_WRITE(V3D_MMU_CTL, V3D_READ(V3D_MMU_CTL));
228
229 if (v3d->ver >= 41) {
230 axi_id = axi_id >> 5;
231 if (axi_id < ARRAY_SIZE(v3d41_axi_ids))
232 client = v3d41_axi_ids[axi_id];
233 }
234
235 dev_err(v3d->drm.dev, "MMU error from client %s (%d) at 0x%llx%s%s%s\n",
236 client, axi_id, (long long)vio_addr,
237 ((intsts & V3D_HUB_INT_MMU_WRV) ?
238 ", write violation" : ""),
239 ((intsts & V3D_HUB_INT_MMU_PTI) ?
240 ", pte invalid" : ""),
241 ((intsts & V3D_HUB_INT_MMU_CAP) ?
242 ", cap exceeded" : ""));
243 status = IRQ_HANDLED;
244 }
245
246 if (v3d->ver >= 71 && (intsts & V3D_V7_HUB_INT_GMPV)) {
247 dev_err(v3d->drm.dev, "GMP Violation\n");
248 status = IRQ_HANDLED;
249 }
250
251 return status;
252}
253
254int
255v3d_irq_init(struct v3d_dev *v3d)
256{
257 int irq1, ret, core;
258
259 INIT_WORK(&v3d->overflow_mem_work, v3d_overflow_mem_work);
260
261 /* Clear any pending interrupts someone might have left around
262 * for us.
263 */
264 for (core = 0; core < v3d->cores; core++)
265 V3D_CORE_WRITE(core, V3D_CTL_INT_CLR, V3D_CORE_IRQS(v3d->ver));
266 V3D_WRITE(V3D_HUB_INT_CLR, V3D_HUB_IRQS(v3d->ver));
267
268 irq1 = platform_get_irq_optional(v3d_to_pdev(v3d), 1);
269 if (irq1 == -EPROBE_DEFER)
270 return irq1;
271 if (irq1 > 0) {
272 ret = devm_request_irq(v3d->drm.dev, irq1,
273 v3d_irq, IRQF_SHARED,
274 "v3d_core0", v3d);
275 if (ret)
276 goto fail;
277 ret = devm_request_irq(v3d->drm.dev,
278 platform_get_irq(v3d_to_pdev(v3d), 0),
279 v3d_hub_irq, IRQF_SHARED,
280 "v3d_hub", v3d);
281 if (ret)
282 goto fail;
283 } else {
284 v3d->single_irq_line = true;
285
286 ret = devm_request_irq(v3d->drm.dev,
287 platform_get_irq(v3d_to_pdev(v3d), 0),
288 v3d_irq, IRQF_SHARED,
289 "v3d", v3d);
290 if (ret)
291 goto fail;
292 }
293
294 v3d_irq_enable(v3d);
295 return 0;
296
297fail:
298 if (ret != -EPROBE_DEFER)
299 dev_err(v3d->drm.dev, "IRQ setup failed: %d\n", ret);
300 return ret;
301}
302
303void
304v3d_irq_enable(struct v3d_dev *v3d)
305{
306 int core;
307
308 /* Enable our set of interrupts, masking out any others. */
309 for (core = 0; core < v3d->cores; core++) {
310 V3D_CORE_WRITE(core, V3D_CTL_INT_MSK_SET, ~V3D_CORE_IRQS(v3d->ver));
311 V3D_CORE_WRITE(core, V3D_CTL_INT_MSK_CLR, V3D_CORE_IRQS(v3d->ver));
312 }
313
314 V3D_WRITE(V3D_HUB_INT_MSK_SET, ~V3D_HUB_IRQS(v3d->ver));
315 V3D_WRITE(V3D_HUB_INT_MSK_CLR, V3D_HUB_IRQS(v3d->ver));
316}
317
318void
319v3d_irq_disable(struct v3d_dev *v3d)
320{
321 int core;
322
323 /* Disable all interrupts. */
324 for (core = 0; core < v3d->cores; core++)
325 V3D_CORE_WRITE(core, V3D_CTL_INT_MSK_SET, ~0);
326 V3D_WRITE(V3D_HUB_INT_MSK_SET, ~0);
327
328 /* Clear any pending interrupts we might have left. */
329 for (core = 0; core < v3d->cores; core++)
330 V3D_CORE_WRITE(core, V3D_CTL_INT_CLR, V3D_CORE_IRQS(v3d->ver));
331 V3D_WRITE(V3D_HUB_INT_CLR, V3D_HUB_IRQS(v3d->ver));
332
333 cancel_work_sync(&v3d->overflow_mem_work);
334}
335
336/** Reinitializes interrupt registers when a GPU reset is performed. */
337void v3d_irq_reset(struct v3d_dev *v3d)
338{
339 v3d_irq_enable(v3d);
340}