| // SPDX-License-Identifier: GPL-2.0 |
| /* Copyright 2019 Linaro, Ltd, Rob Herring <robh@kernel.org> */ |
| /* Copyright 2019 Collabora ltd. */ |
| #include <linux/delay.h> |
| #include <linux/interrupt.h> |
| #include <linux/io.h> |
| #include <linux/platform_device.h> |
| #include <linux/pm_runtime.h> |
| #include <linux/dma-resv.h> |
| #include <drm/gpu_scheduler.h> |
| #include <drm/panfrost_drm.h> |
| |
| #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" |
| |
| #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; |
| }; |
| |
| 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; |
| } |
| |
| static 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), affinity & 0xFFFFFFFF); |
| job_write(pfdev, JS_AFFINITY_NEXT_HI(js), affinity >> 32); |
| } |
| |
| static void panfrost_job_hw_submit(struct panfrost_job *job, int js) |
| { |
| struct panfrost_device *pfdev = job->pfdev; |
| u32 cfg; |
| u64 jc_head = job->jc; |
| int ret; |
| |
| ret = pm_runtime_get_sync(pfdev->dev); |
| if (ret < 0) |
| return; |
| |
| if (WARN_ON(job_read(pfdev, JS_COMMAND_NEXT(js)))) { |
| pm_runtime_put_sync_autosuspend(pfdev->dev); |
| return; |
| } |
| |
| cfg = panfrost_mmu_as_get(pfdev, &job->file_priv->mmu); |
| panfrost_devfreq_record_busy(pfdev); |
| |
| job_write(pfdev, JS_HEAD_NEXT_LO(js), jc_head & 0xFFFFFFFF); |
| job_write(pfdev, JS_HEAD_NEXT_HI(js), jc_head >> 32); |
| |
| 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; |
| |
| 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 ! */ |
| dev_dbg(pfdev->dev, "JS: Submitting atom %p to js[%d] with head=0x%llx", |
| job, js, jc_head); |
| |
| job_write(pfdev, JS_COMMAND_NEXT(js), JS_COMMAND_START); |
| } |
| |
| static void panfrost_acquire_object_fences(struct drm_gem_object **bos, |
| int bo_count, |
| struct dma_fence **implicit_fences) |
| { |
| int i; |
| |
| for (i = 0; i < bo_count; i++) |
| implicit_fences[i] = dma_resv_get_excl_rcu(bos[i]->resv); |
| } |
| |
| 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_excl_fence(bos[i]->resv, fence); |
| } |
| |
| int panfrost_job_push(struct panfrost_job *job) |
| { |
| struct panfrost_device *pfdev = job->pfdev; |
| int slot = panfrost_job_get_slot(job); |
| struct drm_sched_entity *entity = &job->file_priv->sched_entity[slot]; |
| struct ww_acquire_ctx acquire_ctx; |
| int ret = 0; |
| |
| mutex_lock(&pfdev->sched_lock); |
| |
| ret = drm_gem_lock_reservations(job->bos, job->bo_count, |
| &acquire_ctx); |
| if (ret) { |
| mutex_unlock(&pfdev->sched_lock); |
| return ret; |
| } |
| |
| ret = drm_sched_job_init(&job->base, entity, NULL); |
| if (ret) { |
| mutex_unlock(&pfdev->sched_lock); |
| goto unlock; |
| } |
| |
| job->render_done_fence = dma_fence_get(&job->base.s_fence->finished); |
| |
| kref_get(&job->refcount); /* put by scheduler job completion */ |
| |
| panfrost_acquire_object_fences(job->bos, job->bo_count, |
| job->implicit_fences); |
| |
| drm_sched_entity_push_job(&job->base, entity); |
| |
| 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; |
| |
| if (job->in_fences) { |
| for (i = 0; i < job->in_fence_count; i++) |
| dma_fence_put(job->in_fences[i]); |
| kvfree(job->in_fences); |
| } |
| if (job->implicit_fences) { |
| for (i = 0; i < job->bo_count; i++) |
| dma_fence_put(job->implicit_fences[i]); |
| kvfree(job->implicit_fences); |
| } |
| dma_fence_put(job->done_fence); |
| dma_fence_put(job->render_done_fence); |
| |
| if (job->bos) { |
| for (i = 0; i < job->bo_count; i++) |
| drm_gem_object_put_unlocked(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_dependency(struct drm_sched_job *sched_job, |
| struct drm_sched_entity *s_entity) |
| { |
| struct panfrost_job *job = to_panfrost_job(sched_job); |
| struct dma_fence *fence; |
| unsigned int i; |
| |
| /* Explicit fences */ |
| for (i = 0; i < job->in_fence_count; i++) { |
| if (job->in_fences[i]) { |
| fence = job->in_fences[i]; |
| job->in_fences[i] = NULL; |
| return fence; |
| } |
| } |
| |
| /* Implicit fences, max. one per BO */ |
| for (i = 0; i < job->bo_count; i++) { |
| if (job->implicit_fences[i]) { |
| fence = job->implicit_fences[i]; |
| job->implicit_fences[i] = NULL; |
| return fence; |
| } |
| } |
| |
| return NULL; |
| } |
| |
| 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; |
| |
| pfdev->jobs[slot] = job; |
| |
| fence = panfrost_fence_create(pfdev, slot); |
| if (IS_ERR(fence)) |
| return NULL; |
| |
| 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; |
| |
| 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); |
| } |
| |
| static void 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); |
| unsigned long flags; |
| int i; |
| |
| /* |
| * If the GPU managed to complete this jobs fence, the timeout is |
| * spurious. Bail out. |
| */ |
| if (dma_fence_is_signaled(job->done_fence)) |
| return; |
| |
| 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); |
| |
| if (!mutex_trylock(&pfdev->reset_lock)) |
| return; |
| |
| for (i = 0; i < NUM_JOB_SLOTS; i++) { |
| struct drm_gpu_scheduler *sched = &pfdev->js->queue[i].sched; |
| |
| drm_sched_stop(sched, sched_job); |
| if (js != i) |
| /* Ensure any timeouts on other slots have finished */ |
| cancel_delayed_work_sync(&sched->work_tdr); |
| } |
| |
| drm_sched_increase_karma(sched_job); |
| |
| spin_lock_irqsave(&pfdev->js->job_lock, flags); |
| for (i = 0; i < NUM_JOB_SLOTS; i++) { |
| if (pfdev->jobs[i]) { |
| pm_runtime_put_noidle(pfdev->dev); |
| pfdev->jobs[i] = NULL; |
| } |
| } |
| spin_unlock_irqrestore(&pfdev->js->job_lock, flags); |
| |
| panfrost_devfreq_record_idle(pfdev); |
| panfrost_device_reset(pfdev); |
| |
| for (i = 0; i < NUM_JOB_SLOTS; i++) |
| drm_sched_resubmit_jobs(&pfdev->js->queue[i].sched); |
| |
| /* restart scheduler after GPU is usable again */ |
| for (i = 0; i < NUM_JOB_SLOTS; i++) |
| drm_sched_start(&pfdev->js->queue[i].sched, true); |
| |
| mutex_unlock(&pfdev->reset_lock); |
| } |
| |
| static const struct drm_sched_backend_ops panfrost_sched_ops = { |
| .dependency = panfrost_job_dependency, |
| .run_job = panfrost_job_run, |
| .timedout_job = panfrost_job_timedout, |
| .free_job = panfrost_job_free |
| }; |
| |
| static irqreturn_t panfrost_job_irq_handler(int irq, void *data) |
| { |
| struct panfrost_device *pfdev = data; |
| u32 status = job_read(pfdev, JOB_INT_STAT); |
| int j; |
| |
| dev_dbg(pfdev->dev, "jobslot irq status=%x\n", status); |
| |
| if (!status) |
| return IRQ_NONE; |
| |
| pm_runtime_mark_last_busy(pfdev->dev); |
| |
| for (j = 0; status; j++) { |
| u32 mask = MK_JS_MASK(j); |
| |
| if (!(status & mask)) |
| continue; |
| |
| job_write(pfdev, JOB_INT_CLEAR, mask); |
| |
| if (status & JOB_INT_MASK_ERR(j)) { |
| job_write(pfdev, JS_COMMAND_NEXT(j), JS_COMMAND_NOP); |
| |
| dev_err(pfdev->dev, "js fault, js=%d, status=%s, head=0x%x, tail=0x%x", |
| j, |
| panfrost_exception_name(pfdev, job_read(pfdev, JS_STATUS(j))), |
| job_read(pfdev, JS_HEAD_LO(j)), |
| job_read(pfdev, JS_TAIL_LO(j))); |
| |
| drm_sched_fault(&pfdev->js->queue[j].sched); |
| } |
| |
| if (status & JOB_INT_MASK_DONE(j)) { |
| struct panfrost_job *job; |
| |
| spin_lock(&pfdev->js->job_lock); |
| job = pfdev->jobs[j]; |
| /* Only NULL if job timeout occurred */ |
| if (job) { |
| pfdev->jobs[j] = NULL; |
| |
| panfrost_mmu_as_put(pfdev, &job->file_priv->mmu); |
| panfrost_devfreq_record_idle(pfdev); |
| |
| dma_fence_signal_locked(job->done_fence); |
| pm_runtime_put_autosuspend(pfdev->dev); |
| } |
| spin_unlock(&pfdev->js->job_lock); |
| } |
| |
| status &= ~mask; |
| } |
| |
| return IRQ_HANDLED; |
| } |
| |
| int panfrost_job_init(struct panfrost_device *pfdev) |
| { |
| struct panfrost_job_slot *js; |
| int ret, j, irq; |
| |
| pfdev->js = js = devm_kzalloc(pfdev->dev, sizeof(*js), GFP_KERNEL); |
| if (!js) |
| return -ENOMEM; |
| |
| spin_lock_init(&js->job_lock); |
| |
| irq = platform_get_irq_byname(to_platform_device(pfdev->dev), "job"); |
| if (irq <= 0) |
| return -ENODEV; |
| |
| ret = devm_request_irq(pfdev->dev, irq, panfrost_job_irq_handler, |
| IRQF_SHARED, "job", pfdev); |
| if (ret) { |
| dev_err(pfdev->dev, "failed to request job irq"); |
| return ret; |
| } |
| |
| 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, |
| 1, 0, msecs_to_jiffies(500), |
| "pan_js"); |
| 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); |
| |
| 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); |
| |
| } |
| |
| 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) |
| { |
| int i; |
| |
| for (i = 0; i < NUM_JOB_SLOTS; i++) |
| drm_sched_entity_destroy(&panfrost_priv->sched_entity[i]); |
| } |
| |
| int panfrost_job_is_idle(struct panfrost_device *pfdev) |
| { |
| struct panfrost_job_slot *js = pfdev->js; |
| int i; |
| |
| /* Check whether the hardware is idle */ |
| if (atomic_read(&pfdev->devfreq.busy_count)) |
| return false; |
| |
| 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.hw_rq_count)) |
| return false; |
| } |
| |
| return true; |
| } |