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// 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->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) {
struct panfrost_gem_object *bo;
for (i = 0; i < job->bo_count; i++) {
bo = to_panfrost_bo(job->bos[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_sched_rq *rq;
int ret, i;
for (i = 0; i < NUM_JOB_SLOTS; i++) {
rq = &js->queue[i].sched.sched_rq[DRM_SCHED_PRIORITY_NORMAL];
ret = drm_sched_entity_init(&panfrost_priv->sched_entity[i], &rq, 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;
}
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