// SPDX-License-Identifier: GPL-2.0
/* Copyright 2019 Linaro, Ltd, Rob Herring <[email protected]> */
/* Copyright 2019 Collabora ltd. */
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/iopoll.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"
#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) {
if (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;
}
panfrost_cycle_counter_put(job->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)) {
if (pfdev->profile_mode) {
panfrost_cycle_counter_get(pfdev);
job->is_profiled = true;
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]->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);
/* 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;
}
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