// SPDX-License-Identifier: GPL-2.0 /* Copyright 2019 Linaro, Ltd, Rob Herring */ /* Copyright 2019 Collabora ltd. */ #include #include #include #include #include #include #include #include #include #include "panfrost_device.h" #include "panfrost_devfreq.h" #include "panfrost_job.h" #include "panfrost_features.h" #include "panfrost_issues.h" #include "panfrost_gem.h" #include "panfrost_regs.h" #include "panfrost_gpu.h" #include "panfrost_mmu.h" #include "panfrost_dump.h" #define JOB_TIMEOUT_MS 500 #define job_write(dev, reg, data) writel(data, dev->iomem + (reg)) #define job_read(dev, reg) readl(dev->iomem + (reg)) struct panfrost_queue_state { struct drm_gpu_scheduler sched; u64 fence_context; u64 emit_seqno; }; struct panfrost_job_slot { struct panfrost_queue_state queue[NUM_JOB_SLOTS]; spinlock_t job_lock; int irq; }; static struct panfrost_job * to_panfrost_job(struct drm_sched_job *sched_job) { return container_of(sched_job, struct panfrost_job, base); } struct panfrost_fence { struct dma_fence base; struct drm_device *dev; /* panfrost seqno for signaled() test */ u64 seqno; int queue; }; static inline struct panfrost_fence * to_panfrost_fence(struct dma_fence *fence) { return (struct panfrost_fence *)fence; } static const char *panfrost_fence_get_driver_name(struct dma_fence *fence) { return "panfrost"; } static const char *panfrost_fence_get_timeline_name(struct dma_fence *fence) { struct panfrost_fence *f = to_panfrost_fence(fence); switch (f->queue) { case 0: return "panfrost-js-0"; case 1: return "panfrost-js-1"; case 2: return "panfrost-js-2"; default: return NULL; } } static const struct dma_fence_ops panfrost_fence_ops = { .get_driver_name = panfrost_fence_get_driver_name, .get_timeline_name = panfrost_fence_get_timeline_name, }; static struct dma_fence *panfrost_fence_create(struct panfrost_device *pfdev, int js_num) { struct panfrost_fence *fence; struct panfrost_job_slot *js = pfdev->js; fence = kzalloc(sizeof(*fence), GFP_KERNEL); if (!fence) return ERR_PTR(-ENOMEM); fence->dev = pfdev->ddev; fence->queue = js_num; fence->seqno = ++js->queue[js_num].emit_seqno; dma_fence_init(&fence->base, &panfrost_fence_ops, &js->job_lock, js->queue[js_num].fence_context, fence->seqno); return &fence->base; } int panfrost_job_get_slot(struct panfrost_job *job) { /* JS0: fragment jobs. * JS1: vertex/tiler jobs * JS2: compute jobs */ if (job->requirements & PANFROST_JD_REQ_FS) return 0; /* Not exposed to userspace yet */ #if 0 if (job->requirements & PANFROST_JD_REQ_ONLY_COMPUTE) { if ((job->requirements & PANFROST_JD_REQ_CORE_GRP_MASK) && (job->pfdev->features.nr_core_groups == 2)) return 2; if (panfrost_has_hw_issue(job->pfdev, HW_ISSUE_8987)) return 2; } #endif return 1; } static void panfrost_job_write_affinity(struct panfrost_device *pfdev, u32 requirements, int js) { u64 affinity; /* * Use all cores for now. * Eventually we may need to support tiler only jobs and h/w with * multiple (2) coherent core groups */ affinity = pfdev->features.shader_present; job_write(pfdev, JS_AFFINITY_NEXT_LO(js), lower_32_bits(affinity)); job_write(pfdev, JS_AFFINITY_NEXT_HI(js), upper_32_bits(affinity)); } static u32 panfrost_get_job_chain_flag(const struct panfrost_job *job) { struct panfrost_fence *f = to_panfrost_fence(job->done_fence); if (!panfrost_has_hw_feature(job->pfdev, HW_FEATURE_JOBCHAIN_DISAMBIGUATION)) return 0; return (f->seqno & 1) ? JS_CONFIG_JOB_CHAIN_FLAG : 0; } static struct panfrost_job * panfrost_dequeue_job(struct panfrost_device *pfdev, int slot) { struct panfrost_job *job = pfdev->jobs[slot][0]; WARN_ON(!job); if (job->is_profiled && job->engine_usage) { job->engine_usage->elapsed_ns[slot] += ktime_to_ns(ktime_sub(ktime_get(), job->start_time)); job->engine_usage->cycles[slot] += panfrost_cycle_counter_read(pfdev) - job->start_cycles; } if (job->requirements & PANFROST_JD_REQ_CYCLE_COUNT || job->is_profiled) panfrost_cycle_counter_put(pfdev); pfdev->jobs[slot][0] = pfdev->jobs[slot][1]; pfdev->jobs[slot][1] = NULL; return job; } static unsigned int panfrost_enqueue_job(struct panfrost_device *pfdev, int slot, struct panfrost_job *job) { if (WARN_ON(!job)) return 0; if (!pfdev->jobs[slot][0]) { pfdev->jobs[slot][0] = job; return 0; } WARN_ON(pfdev->jobs[slot][1]); pfdev->jobs[slot][1] = job; WARN_ON(panfrost_get_job_chain_flag(job) == panfrost_get_job_chain_flag(pfdev->jobs[slot][0])); return 1; } static void panfrost_job_hw_submit(struct panfrost_job *job, int js) { struct panfrost_device *pfdev = job->pfdev; unsigned int subslot; u32 cfg; u64 jc_head = job->jc; int ret; panfrost_devfreq_record_busy(&pfdev->pfdevfreq); ret = pm_runtime_get_sync(pfdev->dev); if (ret < 0) return; if (WARN_ON(job_read(pfdev, JS_COMMAND_NEXT(js)))) { return; } cfg = panfrost_mmu_as_get(pfdev, job->mmu); job_write(pfdev, JS_HEAD_NEXT_LO(js), lower_32_bits(jc_head)); job_write(pfdev, JS_HEAD_NEXT_HI(js), upper_32_bits(jc_head)); panfrost_job_write_affinity(pfdev, job->requirements, js); /* start MMU, medium priority, cache clean/flush on end, clean/flush on * start */ cfg |= JS_CONFIG_THREAD_PRI(8) | JS_CONFIG_START_FLUSH_CLEAN_INVALIDATE | JS_CONFIG_END_FLUSH_CLEAN_INVALIDATE | panfrost_get_job_chain_flag(job); if (panfrost_has_hw_feature(pfdev, HW_FEATURE_FLUSH_REDUCTION)) cfg |= JS_CONFIG_ENABLE_FLUSH_REDUCTION; if (panfrost_has_hw_issue(pfdev, HW_ISSUE_10649)) cfg |= JS_CONFIG_START_MMU; job_write(pfdev, JS_CONFIG_NEXT(js), cfg); if (panfrost_has_hw_feature(pfdev, HW_FEATURE_FLUSH_REDUCTION)) job_write(pfdev, JS_FLUSH_ID_NEXT(js), job->flush_id); /* GO ! */ spin_lock(&pfdev->js->job_lock); subslot = panfrost_enqueue_job(pfdev, js, job); /* Don't queue the job if a reset is in progress */ if (!atomic_read(&pfdev->reset.pending)) { job->is_profiled = pfdev->profile_mode; if (job->requirements & PANFROST_JD_REQ_CYCLE_COUNT || job->is_profiled) panfrost_cycle_counter_get(pfdev); if (job->is_profiled) { job->start_time = ktime_get(); job->start_cycles = panfrost_cycle_counter_read(pfdev); } job_write(pfdev, JS_COMMAND_NEXT(js), JS_COMMAND_START); dev_dbg(pfdev->dev, "JS: Submitting atom %p to js[%d][%d] with head=0x%llx AS %d", job, js, subslot, jc_head, cfg & 0xf); } spin_unlock(&pfdev->js->job_lock); } static int panfrost_acquire_object_fences(struct drm_gem_object **bos, int bo_count, struct drm_sched_job *job) { int i, ret; for (i = 0; i < bo_count; i++) { ret = dma_resv_reserve_fences(bos[i]->resv, 1); if (ret) return ret; /* panfrost always uses write mode in its current uapi */ ret = drm_sched_job_add_implicit_dependencies(job, bos[i], true); if (ret) return ret; } return 0; } static void panfrost_attach_object_fences(struct drm_gem_object **bos, int bo_count, struct dma_fence *fence) { int i; for (i = 0; i < bo_count; i++) dma_resv_add_fence(bos[i]->resv, fence, DMA_RESV_USAGE_WRITE); } int panfrost_job_push(struct panfrost_job *job) { struct panfrost_device *pfdev = job->pfdev; struct ww_acquire_ctx acquire_ctx; int ret = 0; ret = drm_gem_lock_reservations(job->bos, job->bo_count, &acquire_ctx); if (ret) return ret; mutex_lock(&pfdev->sched_lock); drm_sched_job_arm(&job->base); job->render_done_fence = dma_fence_get(&job->base.s_fence->finished); ret = panfrost_acquire_object_fences(job->bos, job->bo_count, &job->base); if (ret) { mutex_unlock(&pfdev->sched_lock); goto unlock; } kref_get(&job->refcount); /* put by scheduler job completion */ drm_sched_entity_push_job(&job->base); mutex_unlock(&pfdev->sched_lock); panfrost_attach_object_fences(job->bos, job->bo_count, job->render_done_fence); unlock: drm_gem_unlock_reservations(job->bos, job->bo_count, &acquire_ctx); return ret; } static void panfrost_job_cleanup(struct kref *ref) { struct panfrost_job *job = container_of(ref, struct panfrost_job, refcount); unsigned int i; dma_fence_put(job->done_fence); dma_fence_put(job->render_done_fence); if (job->mappings) { for (i = 0; i < job->bo_count; i++) { if (!job->mappings[i]) break; atomic_dec(&job->mappings[i]->obj->gpu_usecount); panfrost_gem_mapping_put(job->mappings[i]); } kvfree(job->mappings); } if (job->bos) { for (i = 0; i < job->bo_count; i++) drm_gem_object_put(job->bos[i]); kvfree(job->bos); } kfree(job); } void panfrost_job_put(struct panfrost_job *job) { kref_put(&job->refcount, panfrost_job_cleanup); } static void panfrost_job_free(struct drm_sched_job *sched_job) { struct panfrost_job *job = to_panfrost_job(sched_job); drm_sched_job_cleanup(sched_job); panfrost_job_put(job); } static struct dma_fence *panfrost_job_run(struct drm_sched_job *sched_job) { struct panfrost_job *job = to_panfrost_job(sched_job); struct panfrost_device *pfdev = job->pfdev; int slot = panfrost_job_get_slot(job); struct dma_fence *fence = NULL; if (unlikely(job->base.s_fence->finished.error)) return NULL; /* Nothing to execute: can happen if the job has finished while * we were resetting the GPU. */ if (!job->jc) return NULL; fence = panfrost_fence_create(pfdev, slot); if (IS_ERR(fence)) return fence; if (job->done_fence) dma_fence_put(job->done_fence); job->done_fence = dma_fence_get(fence); panfrost_job_hw_submit(job, slot); return fence; } void panfrost_job_enable_interrupts(struct panfrost_device *pfdev) { int j; u32 irq_mask = 0; clear_bit(PANFROST_COMP_BIT_JOB, pfdev->is_suspended); for (j = 0; j < NUM_JOB_SLOTS; j++) { irq_mask |= MK_JS_MASK(j); } job_write(pfdev, JOB_INT_CLEAR, irq_mask); job_write(pfdev, JOB_INT_MASK, irq_mask); } void panfrost_job_suspend_irq(struct panfrost_device *pfdev) { set_bit(PANFROST_COMP_BIT_JOB, pfdev->is_suspended); job_write(pfdev, JOB_INT_MASK, 0); synchronize_irq(pfdev->js->irq); } static void panfrost_job_handle_err(struct panfrost_device *pfdev, struct panfrost_job *job, unsigned int js) { u32 js_status = job_read(pfdev, JS_STATUS(js)); const char *exception_name = panfrost_exception_name(js_status); bool signal_fence = true; if (!panfrost_exception_is_fault(js_status)) { dev_dbg(pfdev->dev, "js event, js=%d, status=%s, head=0x%x, tail=0x%x", js, exception_name, job_read(pfdev, JS_HEAD_LO(js)), job_read(pfdev, JS_TAIL_LO(js))); } else { dev_err(pfdev->dev, "js fault, js=%d, status=%s, head=0x%x, tail=0x%x", js, exception_name, job_read(pfdev, JS_HEAD_LO(js)), job_read(pfdev, JS_TAIL_LO(js))); } if (js_status == DRM_PANFROST_EXCEPTION_STOPPED) { /* Update the job head so we can resume */ job->jc = job_read(pfdev, JS_TAIL_LO(js)) | ((u64)job_read(pfdev, JS_TAIL_HI(js)) << 32); /* The job will be resumed, don't signal the fence */ signal_fence = false; } else if (js_status == DRM_PANFROST_EXCEPTION_TERMINATED) { /* Job has been hard-stopped, flag it as canceled */ dma_fence_set_error(job->done_fence, -ECANCELED); job->jc = 0; } else if (panfrost_exception_is_fault(js_status)) { /* We might want to provide finer-grained error code based on * the exception type, but unconditionally setting to EINVAL * is good enough for now. */ dma_fence_set_error(job->done_fence, -EINVAL); job->jc = 0; } panfrost_mmu_as_put(pfdev, job->mmu); panfrost_devfreq_record_idle(&pfdev->pfdevfreq); if (signal_fence) dma_fence_signal_locked(job->done_fence); pm_runtime_put_autosuspend(pfdev->dev); if (panfrost_exception_needs_reset(pfdev, js_status)) { atomic_set(&pfdev->reset.pending, 1); drm_sched_fault(&pfdev->js->queue[js].sched); } } static void panfrost_job_handle_done(struct panfrost_device *pfdev, struct panfrost_job *job) { /* Set ->jc to 0 to avoid re-submitting an already finished job (can * happen when we receive the DONE interrupt while doing a GPU reset). */ job->jc = 0; panfrost_mmu_as_put(pfdev, job->mmu); panfrost_devfreq_record_idle(&pfdev->pfdevfreq); dma_fence_signal_locked(job->done_fence); pm_runtime_put_autosuspend(pfdev->dev); } static void panfrost_job_handle_irq(struct panfrost_device *pfdev, u32 status) { struct panfrost_job *done[NUM_JOB_SLOTS][2] = {}; struct panfrost_job *failed[NUM_JOB_SLOTS] = {}; u32 js_state = 0, js_events = 0; unsigned int i, j; /* First we collect all failed/done jobs. */ while (status) { u32 js_state_mask = 0; for (j = 0; j < NUM_JOB_SLOTS; j++) { if (status & MK_JS_MASK(j)) js_state_mask |= MK_JS_MASK(j); if (status & JOB_INT_MASK_DONE(j)) { if (done[j][0]) done[j][1] = panfrost_dequeue_job(pfdev, j); else done[j][0] = panfrost_dequeue_job(pfdev, j); } if (status & JOB_INT_MASK_ERR(j)) { /* Cancel the next submission. Will be submitted * after we're done handling this failure if * there's no reset pending. */ job_write(pfdev, JS_COMMAND_NEXT(j), JS_COMMAND_NOP); failed[j] = panfrost_dequeue_job(pfdev, j); } } /* JS_STATE is sampled when JOB_INT_CLEAR is written. * For each BIT(slot) or BIT(slot + 16) bit written to * JOB_INT_CLEAR, the corresponding bits in JS_STATE * (BIT(slot) and BIT(slot + 16)) are updated, but this * is racy. If we only have one job done at the time we * read JOB_INT_RAWSTAT but the second job fails before we * clear the status, we end up with a status containing * only the DONE bit and consider both jobs as DONE since * JS_STATE reports both NEXT and CURRENT as inactive. * To prevent that, let's repeat this clear+read steps * until status is 0. */ job_write(pfdev, JOB_INT_CLEAR, status); js_state &= ~js_state_mask; js_state |= job_read(pfdev, JOB_INT_JS_STATE) & js_state_mask; js_events |= status; status = job_read(pfdev, JOB_INT_RAWSTAT); } /* Then we handle the dequeued jobs. */ for (j = 0; j < NUM_JOB_SLOTS; j++) { if (!(js_events & MK_JS_MASK(j))) continue; if (failed[j]) { panfrost_job_handle_err(pfdev, failed[j], j); } else if (pfdev->jobs[j][0] && !(js_state & MK_JS_MASK(j))) { /* When the current job doesn't fail, the JM dequeues * the next job without waiting for an ACK, this means * we can have 2 jobs dequeued and only catch the * interrupt when the second one is done. If both slots * are inactive, but one job remains in pfdev->jobs[j], * consider it done. Of course that doesn't apply if a * failure happened since we cancelled execution of the * job in _NEXT (see above). */ if (WARN_ON(!done[j][0])) done[j][0] = panfrost_dequeue_job(pfdev, j); else done[j][1] = panfrost_dequeue_job(pfdev, j); } for (i = 0; i < ARRAY_SIZE(done[0]) && done[j][i]; i++) panfrost_job_handle_done(pfdev, done[j][i]); } /* And finally we requeue jobs that were waiting in the second slot * and have been stopped if we detected a failure on the first slot. */ for (j = 0; j < NUM_JOB_SLOTS; j++) { if (!(js_events & MK_JS_MASK(j))) continue; if (!failed[j] || !pfdev->jobs[j][0]) continue; if (pfdev->jobs[j][0]->jc == 0) { /* The job was cancelled, signal the fence now */ struct panfrost_job *canceled = panfrost_dequeue_job(pfdev, j); dma_fence_set_error(canceled->done_fence, -ECANCELED); panfrost_job_handle_done(pfdev, canceled); } else if (!atomic_read(&pfdev->reset.pending)) { /* Requeue the job we removed if no reset is pending */ job_write(pfdev, JS_COMMAND_NEXT(j), JS_COMMAND_START); } } } static void panfrost_job_handle_irqs(struct panfrost_device *pfdev) { u32 status = job_read(pfdev, JOB_INT_RAWSTAT); while (status) { pm_runtime_mark_last_busy(pfdev->dev); spin_lock(&pfdev->js->job_lock); panfrost_job_handle_irq(pfdev, status); spin_unlock(&pfdev->js->job_lock); status = job_read(pfdev, JOB_INT_RAWSTAT); } } static u32 panfrost_active_slots(struct panfrost_device *pfdev, u32 *js_state_mask, u32 js_state) { u32 rawstat; if (!(js_state & *js_state_mask)) return 0; rawstat = job_read(pfdev, JOB_INT_RAWSTAT); if (rawstat) { unsigned int i; for (i = 0; i < NUM_JOB_SLOTS; i++) { if (rawstat & MK_JS_MASK(i)) *js_state_mask &= ~MK_JS_MASK(i); } } return js_state & *js_state_mask; } static void panfrost_reset(struct panfrost_device *pfdev, struct drm_sched_job *bad) { u32 js_state, js_state_mask = 0xffffffff; unsigned int i, j; bool cookie; int ret; if (!atomic_read(&pfdev->reset.pending)) return; /* Stop the schedulers. * * FIXME: We temporarily get out of the dma_fence_signalling section * because the cleanup path generate lockdep splats when taking locks * to release job resources. We should rework the code to follow this * pattern: * * try_lock * if (locked) * release * else * schedule_work_to_release_later */ for (i = 0; i < NUM_JOB_SLOTS; i++) drm_sched_stop(&pfdev->js->queue[i].sched, bad); cookie = dma_fence_begin_signalling(); if (bad) drm_sched_increase_karma(bad); /* Mask job interrupts and synchronize to make sure we won't be * interrupted during our reset. */ job_write(pfdev, JOB_INT_MASK, 0); synchronize_irq(pfdev->js->irq); for (i = 0; i < NUM_JOB_SLOTS; i++) { /* Cancel the next job and soft-stop the running job. */ job_write(pfdev, JS_COMMAND_NEXT(i), JS_COMMAND_NOP); job_write(pfdev, JS_COMMAND(i), JS_COMMAND_SOFT_STOP); } /* Wait at most 10ms for soft-stops to complete */ ret = readl_poll_timeout(pfdev->iomem + JOB_INT_JS_STATE, js_state, !panfrost_active_slots(pfdev, &js_state_mask, js_state), 10, 10000); if (ret) dev_err(pfdev->dev, "Soft-stop failed\n"); /* Handle the remaining interrupts before we reset. */ panfrost_job_handle_irqs(pfdev); /* Remaining interrupts have been handled, but we might still have * stuck jobs. Let's make sure the PM counters stay balanced by * manually calling pm_runtime_put_noidle() and * panfrost_devfreq_record_idle() for each stuck job. * Let's also make sure the cycle counting register's refcnt is * kept balanced to prevent it from running forever */ spin_lock(&pfdev->js->job_lock); for (i = 0; i < NUM_JOB_SLOTS; i++) { for (j = 0; j < ARRAY_SIZE(pfdev->jobs[0]) && pfdev->jobs[i][j]; j++) { if (pfdev->jobs[i][j]->requirements & PANFROST_JD_REQ_CYCLE_COUNT || pfdev->jobs[i][j]->is_profiled) panfrost_cycle_counter_put(pfdev->jobs[i][j]->pfdev); pm_runtime_put_noidle(pfdev->dev); panfrost_devfreq_record_idle(&pfdev->pfdevfreq); } } memset(pfdev->jobs, 0, sizeof(pfdev->jobs)); spin_unlock(&pfdev->js->job_lock); /* Proceed with reset now. */ panfrost_device_reset(pfdev); /* panfrost_device_reset() unmasks job interrupts, but we want to * keep them masked a bit longer. */ job_write(pfdev, JOB_INT_MASK, 0); /* GPU has been reset, we can clear the reset pending bit. */ atomic_set(&pfdev->reset.pending, 0); /* Now resubmit jobs that were previously queued but didn't have a * chance to finish. * FIXME: We temporarily get out of the DMA fence signalling section * while resubmitting jobs because the job submission logic will * allocate memory with the GFP_KERNEL flag which can trigger memory * reclaim and exposes a lock ordering issue. */ dma_fence_end_signalling(cookie); for (i = 0; i < NUM_JOB_SLOTS; i++) drm_sched_resubmit_jobs(&pfdev->js->queue[i].sched); cookie = dma_fence_begin_signalling(); /* Restart the schedulers */ for (i = 0; i < NUM_JOB_SLOTS; i++) drm_sched_start(&pfdev->js->queue[i].sched, 0); /* Re-enable job interrupts now that everything has been restarted. */ job_write(pfdev, JOB_INT_MASK, GENMASK(16 + NUM_JOB_SLOTS - 1, 16) | GENMASK(NUM_JOB_SLOTS - 1, 0)); dma_fence_end_signalling(cookie); } static enum drm_gpu_sched_stat panfrost_job_timedout(struct drm_sched_job *sched_job) { struct panfrost_job *job = to_panfrost_job(sched_job); struct panfrost_device *pfdev = job->pfdev; int js = panfrost_job_get_slot(job); /* * If the GPU managed to complete this jobs fence, the timeout is * spurious. Bail out. */ if (dma_fence_is_signaled(job->done_fence)) return DRM_GPU_SCHED_STAT_NOMINAL; /* * Panfrost IRQ handler may take a long time to process an interrupt * if there is another IRQ handler hogging the processing. * For example, the HDMI encoder driver might be stuck in the IRQ * handler for a significant time in a case of bad cable connection. * In order to catch such cases and not report spurious Panfrost * job timeouts, synchronize the IRQ handler and re-check the fence * status. */ synchronize_irq(pfdev->js->irq); if (dma_fence_is_signaled(job->done_fence)) { dev_warn(pfdev->dev, "unexpectedly high interrupt latency\n"); return DRM_GPU_SCHED_STAT_NOMINAL; } dev_err(pfdev->dev, "gpu sched timeout, js=%d, config=0x%x, status=0x%x, head=0x%x, tail=0x%x, sched_job=%p", js, job_read(pfdev, JS_CONFIG(js)), job_read(pfdev, JS_STATUS(js)), job_read(pfdev, JS_HEAD_LO(js)), job_read(pfdev, JS_TAIL_LO(js)), sched_job); panfrost_core_dump(job); atomic_set(&pfdev->reset.pending, 1); panfrost_reset(pfdev, sched_job); return DRM_GPU_SCHED_STAT_NOMINAL; } static void panfrost_reset_work(struct work_struct *work) { struct panfrost_device *pfdev; pfdev = container_of(work, struct panfrost_device, reset.work); panfrost_reset(pfdev, NULL); } static const struct drm_sched_backend_ops panfrost_sched_ops = { .run_job = panfrost_job_run, .timedout_job = panfrost_job_timedout, .free_job = panfrost_job_free }; static irqreturn_t panfrost_job_irq_handler_thread(int irq, void *data) { struct panfrost_device *pfdev = data; panfrost_job_handle_irqs(pfdev); /* Enable interrupts only if we're not about to get suspended */ if (!test_bit(PANFROST_COMP_BIT_JOB, pfdev->is_suspended)) job_write(pfdev, JOB_INT_MASK, GENMASK(16 + NUM_JOB_SLOTS - 1, 16) | GENMASK(NUM_JOB_SLOTS - 1, 0)); return IRQ_HANDLED; } static irqreturn_t panfrost_job_irq_handler(int irq, void *data) { struct panfrost_device *pfdev = data; u32 status; if (test_bit(PANFROST_COMP_BIT_JOB, pfdev->is_suspended)) return IRQ_NONE; status = job_read(pfdev, JOB_INT_STAT); if (!status) return IRQ_NONE; job_write(pfdev, JOB_INT_MASK, 0); return IRQ_WAKE_THREAD; } int panfrost_job_init(struct panfrost_device *pfdev) { struct panfrost_job_slot *js; unsigned int nentries = 2; int ret, j; /* All GPUs have two entries per queue, but without jobchain * disambiguation stopping the right job in the close path is tricky, * so let's just advertise one entry in that case. */ if (!panfrost_has_hw_feature(pfdev, HW_FEATURE_JOBCHAIN_DISAMBIGUATION)) nentries = 1; pfdev->js = js = devm_kzalloc(pfdev->dev, sizeof(*js), GFP_KERNEL); if (!js) return -ENOMEM; INIT_WORK(&pfdev->reset.work, panfrost_reset_work); spin_lock_init(&js->job_lock); js->irq = platform_get_irq_byname(to_platform_device(pfdev->dev), "job"); if (js->irq < 0) return js->irq; ret = devm_request_threaded_irq(pfdev->dev, js->irq, panfrost_job_irq_handler, panfrost_job_irq_handler_thread, IRQF_SHARED, KBUILD_MODNAME "-job", pfdev); if (ret) { dev_err(pfdev->dev, "failed to request job irq"); return ret; } pfdev->reset.wq = alloc_ordered_workqueue("panfrost-reset", 0); if (!pfdev->reset.wq) return -ENOMEM; for (j = 0; j < NUM_JOB_SLOTS; j++) { js->queue[j].fence_context = dma_fence_context_alloc(1); ret = drm_sched_init(&js->queue[j].sched, &panfrost_sched_ops, NULL, DRM_SCHED_PRIORITY_COUNT, nentries, 0, msecs_to_jiffies(JOB_TIMEOUT_MS), pfdev->reset.wq, NULL, "pan_js", pfdev->dev); if (ret) { dev_err(pfdev->dev, "Failed to create scheduler: %d.", ret); goto err_sched; } } panfrost_job_enable_interrupts(pfdev); return 0; err_sched: for (j--; j >= 0; j--) drm_sched_fini(&js->queue[j].sched); destroy_workqueue(pfdev->reset.wq); return ret; } void panfrost_job_fini(struct panfrost_device *pfdev) { struct panfrost_job_slot *js = pfdev->js; int j; job_write(pfdev, JOB_INT_MASK, 0); for (j = 0; j < NUM_JOB_SLOTS; j++) { drm_sched_fini(&js->queue[j].sched); } cancel_work_sync(&pfdev->reset.work); destroy_workqueue(pfdev->reset.wq); } int panfrost_job_open(struct panfrost_file_priv *panfrost_priv) { struct panfrost_device *pfdev = panfrost_priv->pfdev; struct panfrost_job_slot *js = pfdev->js; struct drm_gpu_scheduler *sched; int ret, i; for (i = 0; i < NUM_JOB_SLOTS; i++) { sched = &js->queue[i].sched; ret = drm_sched_entity_init(&panfrost_priv->sched_entity[i], DRM_SCHED_PRIORITY_NORMAL, &sched, 1, NULL); if (WARN_ON(ret)) return ret; } return 0; } void panfrost_job_close(struct panfrost_file_priv *panfrost_priv) { struct panfrost_device *pfdev = panfrost_priv->pfdev; int i; for (i = 0; i < NUM_JOB_SLOTS; i++) drm_sched_entity_destroy(&panfrost_priv->sched_entity[i]); /* Kill in-flight jobs */ spin_lock(&pfdev->js->job_lock); for (i = 0; i < NUM_JOB_SLOTS; i++) { struct drm_sched_entity *entity = &panfrost_priv->sched_entity[i]; int j; for (j = ARRAY_SIZE(pfdev->jobs[0]) - 1; j >= 0; j--) { struct panfrost_job *job = pfdev->jobs[i][j]; u32 cmd; if (!job || job->base.entity != entity) continue; if (j == 1) { /* Try to cancel the job before it starts */ job_write(pfdev, JS_COMMAND_NEXT(i), JS_COMMAND_NOP); /* Reset the job head so it doesn't get restarted if * the job in the first slot failed. */ job->jc = 0; } if (panfrost_has_hw_feature(pfdev, HW_FEATURE_JOBCHAIN_DISAMBIGUATION)) { cmd = panfrost_get_job_chain_flag(job) ? JS_COMMAND_HARD_STOP_1 : JS_COMMAND_HARD_STOP_0; } else { cmd = JS_COMMAND_HARD_STOP; } job_write(pfdev, JS_COMMAND(i), cmd); /* Jobs can outlive their file context */ job->engine_usage = NULL; } } spin_unlock(&pfdev->js->job_lock); } int panfrost_job_is_idle(struct panfrost_device *pfdev) { struct panfrost_job_slot *js = pfdev->js; int i; for (i = 0; i < NUM_JOB_SLOTS; i++) { /* If there are any jobs in the HW queue, we're not idle */ if (atomic_read(&js->queue[i].sched.credit_count)) return false; } return true; }