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d5b1a78a EA |
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 | /** DOC: Interrupt management for the V3D engine. | |
25 | * | |
26 | * We have an interrupt status register (V3D_INTCTL) which reports | |
27 | * interrupts, and where writing 1 bits clears those interrupts. | |
28 | * There are also a pair of interrupt registers | |
29 | * (V3D_INTENA/V3D_INTDIS) where writing a 1 to their bits enables or | |
30 | * disables that specific interrupt, and 0s written are ignored | |
31 | * (reading either one returns the set of enabled interrupts). | |
32 | * | |
ca26d28b VG |
33 | * When we take a binning flush done interrupt, we need to submit the |
34 | * next frame for binning and move the finished frame to the render | |
35 | * thread. | |
36 | * | |
d5b1a78a EA |
37 | * When we take a render frame interrupt, we need to wake the |
38 | * processes waiting for some frame to be done, and get the next frame | |
39 | * submitted ASAP (so the hardware doesn't sit idle when there's work | |
40 | * to do). | |
41 | * | |
42 | * When we take the binner out of memory interrupt, we need to | |
43 | * allocate some new memory and pass it to the binner so that the | |
44 | * current job can make progress. | |
45 | */ | |
46 | ||
47 | #include "vc4_drv.h" | |
48 | #include "vc4_regs.h" | |
49 | ||
50 | #define V3D_DRIVER_IRQS (V3D_INT_OUTOMEM | \ | |
ca26d28b | 51 | V3D_INT_FLDONE | \ |
d5b1a78a EA |
52 | V3D_INT_FRDONE) |
53 | ||
54 | DECLARE_WAIT_QUEUE_HEAD(render_wait); | |
55 | ||
56 | static void | |
57 | vc4_overflow_mem_work(struct work_struct *work) | |
58 | { | |
59 | struct vc4_dev *vc4 = | |
60 | container_of(work, struct vc4_dev, overflow_mem_work); | |
61 | struct drm_device *dev = vc4->dev; | |
62 | struct vc4_bo *bo; | |
63 | ||
64 | bo = vc4_bo_create(dev, 256 * 1024, true); | |
2c68f1fc | 65 | if (IS_ERR(bo)) { |
d5b1a78a EA |
66 | DRM_ERROR("Couldn't allocate binner overflow mem\n"); |
67 | return; | |
68 | } | |
69 | ||
70 | /* If there's a job executing currently, then our previous | |
71 | * overflow allocation is getting used in that job and we need | |
72 | * to queue it to be released when the job is done. But if no | |
73 | * job is executing at all, then we can free the old overflow | |
74 | * object direcctly. | |
75 | * | |
76 | * No lock necessary for this pointer since we're the only | |
77 | * ones that update the pointer, and our workqueue won't | |
78 | * reenter. | |
79 | */ | |
80 | if (vc4->overflow_mem) { | |
81 | struct vc4_exec_info *current_exec; | |
82 | unsigned long irqflags; | |
83 | ||
84 | spin_lock_irqsave(&vc4->job_lock, irqflags); | |
ca26d28b | 85 | current_exec = vc4_first_bin_job(vc4); |
d5b1a78a EA |
86 | if (current_exec) { |
87 | vc4->overflow_mem->seqno = vc4->finished_seqno + 1; | |
88 | list_add_tail(&vc4->overflow_mem->unref_head, | |
89 | ¤t_exec->unref_list); | |
90 | vc4->overflow_mem = NULL; | |
91 | } | |
92 | spin_unlock_irqrestore(&vc4->job_lock, irqflags); | |
93 | } | |
94 | ||
95 | if (vc4->overflow_mem) | |
96 | drm_gem_object_unreference_unlocked(&vc4->overflow_mem->base.base); | |
97 | vc4->overflow_mem = bo; | |
98 | ||
99 | V3D_WRITE(V3D_BPOA, bo->base.paddr); | |
100 | V3D_WRITE(V3D_BPOS, bo->base.base.size); | |
101 | V3D_WRITE(V3D_INTCTL, V3D_INT_OUTOMEM); | |
102 | V3D_WRITE(V3D_INTENA, V3D_INT_OUTOMEM); | |
103 | } | |
104 | ||
105 | static void | |
ca26d28b VG |
106 | vc4_irq_finish_bin_job(struct drm_device *dev) |
107 | { | |
108 | struct vc4_dev *vc4 = to_vc4_dev(dev); | |
109 | struct vc4_exec_info *exec = vc4_first_bin_job(vc4); | |
110 | ||
111 | if (!exec) | |
112 | return; | |
113 | ||
114 | vc4_move_job_to_render(dev, exec); | |
115 | vc4_submit_next_bin_job(dev); | |
116 | } | |
117 | ||
118 | static void | |
119 | vc4_cancel_bin_job(struct drm_device *dev) | |
120 | { | |
121 | struct vc4_dev *vc4 = to_vc4_dev(dev); | |
122 | struct vc4_exec_info *exec = vc4_first_bin_job(vc4); | |
123 | ||
124 | if (!exec) | |
125 | return; | |
126 | ||
127 | list_move_tail(&exec->head, &vc4->bin_job_list); | |
128 | vc4_submit_next_bin_job(dev); | |
129 | } | |
130 | ||
131 | static void | |
132 | vc4_irq_finish_render_job(struct drm_device *dev) | |
d5b1a78a EA |
133 | { |
134 | struct vc4_dev *vc4 = to_vc4_dev(dev); | |
ca26d28b | 135 | struct vc4_exec_info *exec = vc4_first_render_job(vc4); |
d5b1a78a EA |
136 | |
137 | if (!exec) | |
138 | return; | |
139 | ||
140 | vc4->finished_seqno++; | |
141 | list_move_tail(&exec->head, &vc4->job_done_list); | |
ca26d28b | 142 | vc4_submit_next_render_job(dev); |
d5b1a78a EA |
143 | |
144 | wake_up_all(&vc4->job_wait_queue); | |
145 | schedule_work(&vc4->job_done_work); | |
146 | } | |
147 | ||
148 | irqreturn_t | |
149 | vc4_irq(int irq, void *arg) | |
150 | { | |
151 | struct drm_device *dev = arg; | |
152 | struct vc4_dev *vc4 = to_vc4_dev(dev); | |
153 | uint32_t intctl; | |
154 | irqreturn_t status = IRQ_NONE; | |
155 | ||
156 | barrier(); | |
157 | intctl = V3D_READ(V3D_INTCTL); | |
158 | ||
ca26d28b VG |
159 | /* Acknowledge the interrupts we're handling here. The binner |
160 | * last flush / render frame done interrupt will be cleared, | |
161 | * while OUTOMEM will stay high until the underlying cause is | |
162 | * cleared. | |
d5b1a78a EA |
163 | */ |
164 | V3D_WRITE(V3D_INTCTL, intctl); | |
165 | ||
166 | if (intctl & V3D_INT_OUTOMEM) { | |
167 | /* Disable OUTOMEM until the work is done. */ | |
168 | V3D_WRITE(V3D_INTDIS, V3D_INT_OUTOMEM); | |
169 | schedule_work(&vc4->overflow_mem_work); | |
170 | status = IRQ_HANDLED; | |
171 | } | |
172 | ||
ca26d28b VG |
173 | if (intctl & V3D_INT_FLDONE) { |
174 | spin_lock(&vc4->job_lock); | |
175 | vc4_irq_finish_bin_job(dev); | |
176 | spin_unlock(&vc4->job_lock); | |
177 | status = IRQ_HANDLED; | |
178 | } | |
179 | ||
d5b1a78a EA |
180 | if (intctl & V3D_INT_FRDONE) { |
181 | spin_lock(&vc4->job_lock); | |
ca26d28b | 182 | vc4_irq_finish_render_job(dev); |
d5b1a78a EA |
183 | spin_unlock(&vc4->job_lock); |
184 | status = IRQ_HANDLED; | |
185 | } | |
186 | ||
187 | return status; | |
188 | } | |
189 | ||
190 | void | |
191 | vc4_irq_preinstall(struct drm_device *dev) | |
192 | { | |
193 | struct vc4_dev *vc4 = to_vc4_dev(dev); | |
194 | ||
195 | init_waitqueue_head(&vc4->job_wait_queue); | |
196 | INIT_WORK(&vc4->overflow_mem_work, vc4_overflow_mem_work); | |
197 | ||
198 | /* Clear any pending interrupts someone might have left around | |
199 | * for us. | |
200 | */ | |
201 | V3D_WRITE(V3D_INTCTL, V3D_DRIVER_IRQS); | |
202 | } | |
203 | ||
204 | int | |
205 | vc4_irq_postinstall(struct drm_device *dev) | |
206 | { | |
207 | struct vc4_dev *vc4 = to_vc4_dev(dev); | |
208 | ||
209 | /* Enable both the render done and out of memory interrupts. */ | |
210 | V3D_WRITE(V3D_INTENA, V3D_DRIVER_IRQS); | |
211 | ||
212 | return 0; | |
213 | } | |
214 | ||
215 | void | |
216 | vc4_irq_uninstall(struct drm_device *dev) | |
217 | { | |
218 | struct vc4_dev *vc4 = to_vc4_dev(dev); | |
219 | ||
220 | /* Disable sending interrupts for our driver's IRQs. */ | |
221 | V3D_WRITE(V3D_INTDIS, V3D_DRIVER_IRQS); | |
222 | ||
223 | /* Clear any pending interrupts we might have left. */ | |
224 | V3D_WRITE(V3D_INTCTL, V3D_DRIVER_IRQS); | |
225 | ||
226 | cancel_work_sync(&vc4->overflow_mem_work); | |
227 | } | |
228 | ||
229 | /** Reinitializes interrupt registers when a GPU reset is performed. */ | |
230 | void vc4_irq_reset(struct drm_device *dev) | |
231 | { | |
232 | struct vc4_dev *vc4 = to_vc4_dev(dev); | |
233 | unsigned long irqflags; | |
234 | ||
235 | /* Acknowledge any stale IRQs. */ | |
236 | V3D_WRITE(V3D_INTCTL, V3D_DRIVER_IRQS); | |
237 | ||
238 | /* | |
239 | * Turn all our interrupts on. Binner out of memory is the | |
240 | * only one we expect to trigger at this point, since we've | |
241 | * just come from poweron and haven't supplied any overflow | |
242 | * memory yet. | |
243 | */ | |
244 | V3D_WRITE(V3D_INTENA, V3D_DRIVER_IRQS); | |
245 | ||
246 | spin_lock_irqsave(&vc4->job_lock, irqflags); | |
ca26d28b VG |
247 | vc4_cancel_bin_job(dev); |
248 | vc4_irq_finish_render_job(dev); | |
d5b1a78a EA |
249 | spin_unlock_irqrestore(&vc4->job_lock, irqflags); |
250 | } |