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 "vc4_drv.h" 49 #include "vc4_regs.h" 50 51 #define V3D_DRIVER_IRQS (V3D_INT_OUTOMEM | \ 52 V3D_INT_FLDONE | \ 53 V3D_INT_FRDONE) 54 55 DECLARE_WAIT_QUEUE_HEAD(render_wait); 56 57 static void 58 vc4_overflow_mem_work(struct work_struct *work) 59 { 60 struct vc4_dev *vc4 = 61 container_of(work, struct vc4_dev, overflow_mem_work); 62 struct drm_device *dev = vc4->dev; 63 struct vc4_bo *bo; 64 65 bo = vc4_bo_create(dev, 256 * 1024, true); 66 if (IS_ERR(bo)) { 67 DRM_ERROR("Couldn't allocate binner overflow mem\n"); 68 return; 69 } 70 71 /* If there's a job executing currently, then our previous 72 * overflow allocation is getting used in that job and we need 73 * to queue it to be released when the job is done. But if no 74 * job is executing at all, then we can free the old overflow 75 * object direcctly. 76 * 77 * No lock necessary for this pointer since we're the only 78 * ones that update the pointer, and our workqueue won't 79 * reenter. 80 */ 81 if (vc4->overflow_mem) { 82 struct vc4_exec_info *current_exec; 83 unsigned long irqflags; 84 85 spin_lock_irqsave(&vc4->job_lock, irqflags); 86 current_exec = vc4_first_bin_job(vc4); 87 if (!current_exec) 88 current_exec = vc4_last_render_job(vc4); 89 if (current_exec) { 90 vc4->overflow_mem->seqno = current_exec->seqno; 91 list_add_tail(&vc4->overflow_mem->unref_head, 92 ¤t_exec->unref_list); 93 vc4->overflow_mem = NULL; 94 } 95 spin_unlock_irqrestore(&vc4->job_lock, irqflags); 96 } 97 98 if (vc4->overflow_mem) 99 drm_gem_object_unreference_unlocked(&vc4->overflow_mem->base.base); 100 vc4->overflow_mem = bo; 101 102 V3D_WRITE(V3D_BPOA, bo->base.paddr); 103 V3D_WRITE(V3D_BPOS, bo->base.base.size); 104 V3D_WRITE(V3D_INTCTL, V3D_INT_OUTOMEM); 105 V3D_WRITE(V3D_INTENA, V3D_INT_OUTOMEM); 106 } 107 108 static void 109 vc4_irq_finish_bin_job(struct drm_device *dev) 110 { 111 struct vc4_dev *vc4 = to_vc4_dev(dev); 112 struct vc4_exec_info *exec = vc4_first_bin_job(vc4); 113 114 if (!exec) 115 return; 116 117 vc4_move_job_to_render(dev, exec); 118 vc4_submit_next_bin_job(dev); 119 } 120 121 static void 122 vc4_cancel_bin_job(struct drm_device *dev) 123 { 124 struct vc4_dev *vc4 = to_vc4_dev(dev); 125 struct vc4_exec_info *exec = vc4_first_bin_job(vc4); 126 127 if (!exec) 128 return; 129 130 list_move_tail(&exec->head, &vc4->bin_job_list); 131 vc4_submit_next_bin_job(dev); 132 } 133 134 static void 135 vc4_irq_finish_render_job(struct drm_device *dev) 136 { 137 struct vc4_dev *vc4 = to_vc4_dev(dev); 138 struct vc4_exec_info *exec = vc4_first_render_job(vc4); 139 140 if (!exec) 141 return; 142 143 vc4->finished_seqno++; 144 list_move_tail(&exec->head, &vc4->job_done_list); 145 vc4_submit_next_render_job(dev); 146 147 wake_up_all(&vc4->job_wait_queue); 148 schedule_work(&vc4->job_done_work); 149 } 150 151 irqreturn_t 152 vc4_irq(int irq, void *arg) 153 { 154 struct drm_device *dev = arg; 155 struct vc4_dev *vc4 = to_vc4_dev(dev); 156 uint32_t intctl; 157 irqreturn_t status = IRQ_NONE; 158 159 barrier(); 160 intctl = V3D_READ(V3D_INTCTL); 161 162 /* Acknowledge the interrupts we're handling here. The binner 163 * last flush / render frame done interrupt will be cleared, 164 * while OUTOMEM will stay high until the underlying cause is 165 * cleared. 166 */ 167 V3D_WRITE(V3D_INTCTL, intctl); 168 169 if (intctl & V3D_INT_OUTOMEM) { 170 /* Disable OUTOMEM until the work is done. */ 171 V3D_WRITE(V3D_INTDIS, V3D_INT_OUTOMEM); 172 schedule_work(&vc4->overflow_mem_work); 173 status = IRQ_HANDLED; 174 } 175 176 if (intctl & V3D_INT_FLDONE) { 177 spin_lock(&vc4->job_lock); 178 vc4_irq_finish_bin_job(dev); 179 spin_unlock(&vc4->job_lock); 180 status = IRQ_HANDLED; 181 } 182 183 if (intctl & V3D_INT_FRDONE) { 184 spin_lock(&vc4->job_lock); 185 vc4_irq_finish_render_job(dev); 186 spin_unlock(&vc4->job_lock); 187 status = IRQ_HANDLED; 188 } 189 190 return status; 191 } 192 193 void 194 vc4_irq_preinstall(struct drm_device *dev) 195 { 196 struct vc4_dev *vc4 = to_vc4_dev(dev); 197 198 init_waitqueue_head(&vc4->job_wait_queue); 199 INIT_WORK(&vc4->overflow_mem_work, vc4_overflow_mem_work); 200 201 /* Clear any pending interrupts someone might have left around 202 * for us. 203 */ 204 V3D_WRITE(V3D_INTCTL, V3D_DRIVER_IRQS); 205 } 206 207 int 208 vc4_irq_postinstall(struct drm_device *dev) 209 { 210 struct vc4_dev *vc4 = to_vc4_dev(dev); 211 212 /* Enable both the render done and out of memory interrupts. */ 213 V3D_WRITE(V3D_INTENA, V3D_DRIVER_IRQS); 214 215 return 0; 216 } 217 218 void 219 vc4_irq_uninstall(struct drm_device *dev) 220 { 221 struct vc4_dev *vc4 = to_vc4_dev(dev); 222 223 /* Disable sending interrupts for our driver's IRQs. */ 224 V3D_WRITE(V3D_INTDIS, V3D_DRIVER_IRQS); 225 226 /* Clear any pending interrupts we might have left. */ 227 V3D_WRITE(V3D_INTCTL, V3D_DRIVER_IRQS); 228 229 cancel_work_sync(&vc4->overflow_mem_work); 230 } 231 232 /** Reinitializes interrupt registers when a GPU reset is performed. */ 233 void vc4_irq_reset(struct drm_device *dev) 234 { 235 struct vc4_dev *vc4 = to_vc4_dev(dev); 236 unsigned long irqflags; 237 238 /* Acknowledge any stale IRQs. */ 239 V3D_WRITE(V3D_INTCTL, V3D_DRIVER_IRQS); 240 241 /* 242 * Turn all our interrupts on. Binner out of memory is the 243 * only one we expect to trigger at this point, since we've 244 * just come from poweron and haven't supplied any overflow 245 * memory yet. 246 */ 247 V3D_WRITE(V3D_INTENA, V3D_DRIVER_IRQS); 248 249 spin_lock_irqsave(&vc4->job_lock, irqflags); 250 vc4_cancel_bin_job(dev); 251 vc4_irq_finish_render_job(dev); 252 spin_unlock_irqrestore(&vc4->job_lock, irqflags); 253 } 254