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

source code of linux/drivers/gpu/drm/v3d/v3d_irq.c