drivers/gpu/drm/v3d/v3d_irq.c

   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 binning or rendering flush done interrupt, we need
   8  * to signal the fence for that job so that the scheduler can queue up
   9  * 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 "v3d_drv.h"
  17 #include "v3d_regs.h"
  18
  19 #define V3D_CORE_IRQS ((u32)(V3D_INT_OUTOMEM |  \
  20                              V3D_INT_FLDONE |   \
  21                              V3D_INT_FRDONE |   \
  22                              V3D_INT_GMPV))
  23
  24 #define V3D_HUB_IRQS ((u32)(V3D_HUB_INT_MMU_WRV |       \
  25                             V3D_HUB_INT_MMU_PTI |       \
  26                             V3D_HUB_INT_MMU_CAP))
  27
  28 static void
  29 v3d_overflow_mem_work(struct work_struct *work)
  30 {
  31         struct v3d_dev *v3d =
  32                 container_of(work, struct v3d_dev, overflow_mem_work);
  33         struct drm_device *dev = &v3d->drm;
  34         struct v3d_bo *bo = v3d_bo_create(dev, NULL /* XXX: GMP */, 256 * 1024);
  35         unsigned long irqflags;
  36
  37         if (IS_ERR(bo)) {
  38                 DRM_ERROR("Couldn't allocate binner overflow mem\n");
  39                 return;
  40         }
  41
  42         /* We lost a race, and our work task came in after the bin job
  43          * completed and exited.  This can happen because the HW
  44          * signals OOM before it's fully OOM, so the binner might just
  45          * barely complete.
  46          *
  47          * If we lose the race and our work task comes in after a new
  48          * bin job got scheduled, that's fine.  We'll just give them
  49          * some binner pool anyway.
  50          */
  51         spin_lock_irqsave(&v3d->job_lock, irqflags);
  52         if (!v3d->bin_job) {
  53                 spin_unlock_irqrestore(&v3d->job_lock, irqflags);
  54                 goto out;
  55         }
  56
  57         drm_gem_object_get(&bo->base);
  58         list_add_tail(&bo->unref_head, &v3d->bin_job->unref_list);
  59         spin_unlock_irqrestore(&v3d->job_lock, irqflags);
  60
  61         V3D_CORE_WRITE(0, V3D_PTB_BPOA, bo->node.start << PAGE_SHIFT);
  62         V3D_CORE_WRITE(0, V3D_PTB_BPOS, bo->base.size);
  63
  64 out:
  65         drm_gem_object_put_unlocked(&bo->base);
  66 }
  67
  68 static irqreturn_t
  69 v3d_irq(int irq, void *arg)
  70 {
  71         struct v3d_dev *v3d = arg;
  72         u32 intsts;
  73         irqreturn_t status = IRQ_NONE;
  74
  75         intsts = V3D_CORE_READ(0, V3D_CTL_INT_STS);
  76
  77         /* Acknowledge the interrupts we're handling here. */
  78         V3D_CORE_WRITE(0, V3D_CTL_INT_CLR, intsts);
  79
  80         if (intsts & V3D_INT_OUTOMEM) {
  81                 /* Note that the OOM status is edge signaled, so the
  82                  * interrupt won't happen again until the we actually
  83                  * add more memory.
  84                  */
  85                 schedule_work(&v3d->overflow_mem_work);
  86                 status = IRQ_HANDLED;
  87         }
  88
  89         if (intsts & V3D_INT_FLDONE) {
  90                 dma_fence_signal(v3d->bin_job->bin.done_fence);
  91                 status = IRQ_HANDLED;
  92         }
  93
  94         if (intsts & V3D_INT_FRDONE) {
  95                 dma_fence_signal(v3d->render_job->render.done_fence);
  96                 status = IRQ_HANDLED;
  97         }
  98
  99         /* We shouldn't be triggering these if we have GMP in
 100          * always-allowed mode.
 101          */
 102         if (intsts & V3D_INT_GMPV)
 103                 dev_err(v3d->dev, "GMP violation\n");
 104
 105         return status;
 106 }
 107
 108 static irqreturn_t
 109 v3d_hub_irq(int irq, void *arg)
 110 {
 111         struct v3d_dev *v3d = arg;
 112         u32 intsts;
 113         irqreturn_t status = IRQ_NONE;
 114
 115         intsts = V3D_READ(V3D_HUB_INT_STS);
 116
 117         /* Acknowledge the interrupts we're handling here. */
 118         V3D_WRITE(V3D_HUB_INT_CLR, intsts);
 119
 120         if (intsts & (V3D_HUB_INT_MMU_WRV |
 121                       V3D_HUB_INT_MMU_PTI |
 122                       V3D_HUB_INT_MMU_CAP)) {
 123                 u32 axi_id = V3D_READ(V3D_MMU_VIO_ID);
 124                 u64 vio_addr = (u64)V3D_READ(V3D_MMU_VIO_ADDR) << 8;
 125
 126                 dev_err(v3d->dev, "MMU error from client %d at 0x%08llx%s%s%s\n",
 127                         axi_id, (long long)vio_addr,
 128                         ((intsts & V3D_HUB_INT_MMU_WRV) ?
 129                          ", write violation" : ""),
 130                         ((intsts & V3D_HUB_INT_MMU_PTI) ?
 131                          ", pte invalid" : ""),
 132                         ((intsts & V3D_HUB_INT_MMU_CAP) ?
 133                          ", cap exceeded" : ""));
 134                 status = IRQ_HANDLED;
 135         }
 136
 137         return status;
 138 }
 139
 140 int
 141 v3d_irq_init(struct v3d_dev *v3d)
 142 {
 143         int ret, core;
 144
 145         INIT_WORK(&v3d->overflow_mem_work, v3d_overflow_mem_work);
 146
 147         /* Clear any pending interrupts someone might have left around
 148          * for us.
 149          */
 150         for (core = 0; core < v3d->cores; core++)
 151                 V3D_CORE_WRITE(core, V3D_CTL_INT_CLR, V3D_CORE_IRQS);
 152         V3D_WRITE(V3D_HUB_INT_CLR, V3D_HUB_IRQS);
 153
 154         ret = devm_request_irq(v3d->dev, platform_get_irq(v3d->pdev, 0),
 155                                v3d_hub_irq, IRQF_SHARED,
 156                                "v3d_hub", v3d);
 157         if (ret)
 158                 goto fail;
 159
 160         ret = devm_request_irq(v3d->dev, platform_get_irq(v3d->pdev, 1),
 161                                v3d_irq, IRQF_SHARED,
 162                                "v3d_core0", v3d);
 163         if (ret)
 164                 goto fail;
 165
 166         v3d_irq_enable(v3d);
 167         return 0;
 168
 169 fail:
 170         if (ret != -EPROBE_DEFER)
 171                 dev_err(v3d->dev, "IRQ setup failed: %d\n", ret);
 172         return ret;
 173 }
 174
 175 void
 176 v3d_irq_enable(struct v3d_dev *v3d)
 177 {
 178         int core;
 179
 180         /* Enable our set of interrupts, masking out any others. */
 181         for (core = 0; core < v3d->cores; core++) {
 182                 V3D_CORE_WRITE(core, V3D_CTL_INT_MSK_SET, ~V3D_CORE_IRQS);
 183                 V3D_CORE_WRITE(core, V3D_CTL_INT_MSK_CLR, V3D_CORE_IRQS);
 184         }
 185
 186         V3D_WRITE(V3D_HUB_INT_MSK_SET, ~V3D_HUB_IRQS);
 187         V3D_WRITE(V3D_HUB_INT_MSK_CLR, V3D_HUB_IRQS);
 188 }
 189
 190 void
 191 v3d_irq_disable(struct v3d_dev *v3d)
 192 {
 193         int core;
 194
 195         /* Disable all interrupts. */
 196         for (core = 0; core < v3d->cores; core++)
 197                 V3D_CORE_WRITE(core, V3D_CTL_INT_MSK_SET, ~0);
 198         V3D_WRITE(V3D_HUB_INT_MSK_SET, ~0);
 199
 200         /* Clear any pending interrupts we might have left. */
 201         for (core = 0; core < v3d->cores; core++)
 202                 V3D_CORE_WRITE(core, V3D_CTL_INT_CLR, V3D_CORE_IRQS);
 203         V3D_WRITE(V3D_HUB_INT_CLR, V3D_HUB_IRQS);
 204
 205         cancel_work_sync(&v3d->overflow_mem_work);
 206 }
 207
 208 /** Reinitializes interrupt registers when a GPU reset is performed. */
 209 void v3d_irq_reset(struct v3d_dev *v3d)
 210 {
 211         v3d_irq_enable(v3d);
 212 }