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 33 static irqreturn_t 34 v3d_hub_irq(int irq, void *arg); 35 36 static void 37 v3d_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 */, 256 * 1024); 43 struct drm_gem_object *obj; 44 unsigned long irqflags; 45 46 if (IS_ERR(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(&v3d->job_lock, irqflags); 64 goto out; 65 } 66 67 drm_gem_object_get(obj); 68 list_add_tail(&bo->unref_head, &v3d->bin_job->render->unref_list); 69 spin_unlock_irqrestore(&v3d->job_lock, 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 74 out: 75 drm_gem_object_put(obj); 76 } 77 78 static irqreturn_t 79 v3d_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(&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(v3d->bin_job->base.irq_fence); 103 104 trace_v3d_bcl_irq(&v3d->drm, fence->seqno); 105 dma_fence_signal(&fence->base); 106 status = IRQ_HANDLED; 107 } 108 109 if (intsts & V3D_INT_FRDONE) { 110 struct v3d_fence *fence = 111 to_v3d_fence(v3d->render_job->base.irq_fence); 112 113 trace_v3d_rcl_irq(&v3d->drm, fence->seqno); 114 dma_fence_signal(&fence->base); 115 status = IRQ_HANDLED; 116 } 117 118 if (intsts & V3D_INT_CSDDONE) { 119 struct v3d_fence *fence = 120 to_v3d_fence(v3d->csd_job->base.irq_fence); 121 122 trace_v3d_csd_irq(&v3d->drm, fence->seqno); 123 dma_fence_signal(&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 } 141 142 static irqreturn_t 143 v3d_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(v3d->tfu_job->base.irq_fence); 157 158 trace_v3d_tfu_irq(&v3d->drm, fence->seqno); 159 dma_fence_signal(&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 } 202 203 int 204 v3d_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(v3d->drm.dev, irq1, 222 v3d_irq, IRQF_SHARED, 223 "v3d_core0", v3d); 224 if (ret) 225 goto fail; 226 ret = devm_request_irq(v3d->drm.dev, 227 platform_get_irq(v3d_to_pdev(v3d), 0), 228 v3d_hub_irq, IRQF_SHARED, 229 "v3d_hub", v3d); 230 if (ret) 231 goto fail; 232 } else { 233 v3d->single_irq_line = true; 234 235 ret = devm_request_irq(v3d->drm.dev, 236 platform_get_irq(v3d_to_pdev(v3d), 0), 237 v3d_irq, IRQF_SHARED, 238 "v3d", v3d); 239 if (ret) 240 goto fail; 241 } 242 243 v3d_irq_enable(v3d); 244 return 0; 245 246 fail: 247 if (ret != -EPROBE_DEFER) 248 dev_err(v3d->drm.dev, "IRQ setup failed: %d\n", ret); 249 return ret; 250 } 251 252 void 253 v3d_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 } 266 267 void 268 v3d_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(&v3d->overflow_mem_work); 283 } 284 285 /** Reinitializes interrupt registers when a GPU reset is performed. */ 286 void v3d_irq_reset(struct v3d_dev *v3d) 287 { 288 v3d_irq_enable(v3d); 289 } 290