[PATCH] drm/panfrost: Queue jobs on the hardware
From: Steven Price
Date: Fri Aug 16 2019 - 05:31:19 EST
The hardware has a set of '_NEXT' registers that can hold a second job
while the first is executing. Make use of these registers to enqueue a
second job per slot.
Signed-off-by: Steven Price <steven.price@xxxxxxx>
---
Note that this is based on top of Rob Herring's "per FD address space"
patch[1].
[1] https://marc.info/?i=20190813150115.30338-1-robh%20()%20kernel%20!%20org
drivers/gpu/drm/panfrost/panfrost_device.h | 4 +-
drivers/gpu/drm/panfrost/panfrost_job.c | 76 ++++++++++++++++++----
drivers/gpu/drm/panfrost/panfrost_mmu.c | 2 +-
3 files changed, 67 insertions(+), 15 deletions(-)
diff --git a/drivers/gpu/drm/panfrost/panfrost_device.h b/drivers/gpu/drm/panfrost/panfrost_device.h
index f503c566e99f..0153defd6085 100644
--- a/drivers/gpu/drm/panfrost/panfrost_device.h
+++ b/drivers/gpu/drm/panfrost/panfrost_device.h
@@ -55,7 +55,7 @@ struct panfrost_devfreq_slot {
ktime_t busy_time;
ktime_t idle_time;
ktime_t time_last_update;
- bool busy;
+ int busy;
};
struct panfrost_device {
@@ -80,7 +80,7 @@ struct panfrost_device {
struct panfrost_job_slot *js;
- struct panfrost_job *jobs[NUM_JOB_SLOTS];
+ struct panfrost_job *jobs[NUM_JOB_SLOTS][2];
struct list_head scheduled_jobs;
struct panfrost_perfcnt *perfcnt;
diff --git a/drivers/gpu/drm/panfrost/panfrost_job.c b/drivers/gpu/drm/panfrost/panfrost_job.c
index 05c85f45a0de..b2b5027af976 100644
--- a/drivers/gpu/drm/panfrost/panfrost_job.c
+++ b/drivers/gpu/drm/panfrost/panfrost_job.c
@@ -138,6 +138,37 @@ static void panfrost_job_write_affinity(struct panfrost_device *pfdev,
job_write(pfdev, JS_AFFINITY_NEXT_HI(js), affinity >> 32);
}
+static int panfrost_job_count(struct panfrost_device *pfdev, int slot)
+{
+ if (pfdev->jobs[slot][0] == NULL)
+ return 0;
+ if (pfdev->jobs[slot][1] == NULL)
+ return 1;
+ return 2;
+}
+
+static struct panfrost_job *panfrost_dequeue_job(
+ struct panfrost_device *pfdev, int slot)
+{
+ struct panfrost_job *job = pfdev->jobs[slot][0];
+
+ pfdev->jobs[slot][0] = pfdev->jobs[slot][1];
+ pfdev->jobs[slot][1] = NULL;
+
+ return job;
+}
+
+static void panfrost_enqueue_job(struct panfrost_device *pfdev, int slot,
+ struct panfrost_job *job)
+{
+ if (pfdev->jobs[slot][0] == NULL) {
+ pfdev->jobs[slot][0] = job;
+ return;
+ }
+ WARN_ON(pfdev->jobs[slot][1] != NULL);
+ pfdev->jobs[slot][1] = job;
+}
+
static void panfrost_job_hw_submit(struct panfrost_job *job, int js)
{
struct panfrost_device *pfdev = job->pfdev;
@@ -150,13 +181,16 @@ static void panfrost_job_hw_submit(struct panfrost_job *job, int js)
if (ret < 0)
return;
- if (WARN_ON(job_read(pfdev, JS_COMMAND_NEXT(js))))
- goto end;
-
cfg = panfrost_mmu_as_get(pfdev, &job->file_priv->mmu);
- panfrost_devfreq_record_transition(pfdev, js);
spin_lock_irqsave(&pfdev->hwaccess_lock, flags);
+ panfrost_enqueue_job(pfdev, js, job);
+
+ if (WARN_ON(job_read(pfdev, JS_COMMAND_NEXT(js))))
+ goto end;
+
+ if (panfrost_job_count(pfdev, js) == 1)
+ panfrost_devfreq_record_transition(pfdev, js);
job_write(pfdev, JS_HEAD_NEXT_LO(js), jc_head & 0xFFFFFFFF);
job_write(pfdev, JS_HEAD_NEXT_HI(js), jc_head >> 32);
@@ -186,9 +220,9 @@ static void panfrost_job_hw_submit(struct panfrost_job *job, int js)
job_write(pfdev, JS_COMMAND_NEXT(js), JS_COMMAND_START);
+end:
spin_unlock_irqrestore(&pfdev->hwaccess_lock, flags);
-end:
pm_runtime_mark_last_busy(pfdev->dev);
pm_runtime_put_autosuspend(pfdev->dev);
}
@@ -336,8 +370,6 @@ static struct dma_fence *panfrost_job_run(struct drm_sched_job *sched_job)
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;
@@ -421,21 +453,36 @@ 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;
+ unsigned long flags;
dev_dbg(pfdev->dev, "jobslot irq status=%x\n", status);
if (!status)
return IRQ_NONE;
+ spin_lock_irqsave(&pfdev->hwaccess_lock, flags);
+
pm_runtime_mark_last_busy(pfdev->dev);
for (j = 0; status; j++) {
u32 mask = MK_JS_MASK(j);
+ int jobs = panfrost_job_count(pfdev, j);
+ int active;
if (!(status & mask))
continue;
job_write(pfdev, JOB_INT_CLEAR, mask);
+ active = (job_read(pfdev, JOB_INT_JS_STATE) &
+ JOB_INT_MASK_DONE(j)) ? 1 : 0;
+
+ if (!(status & JOB_INT_MASK_ERR(j))) {
+ /* Recheck RAWSTAT to check if there's a newly
+ * failed job (since JOB_INT_STAT was read)
+ */
+ status |= job_read(pfdev, JOB_INT_RAWSTAT) &
+ JOB_INT_MASK_ERR(j);
+ }
if (status & JOB_INT_MASK_ERR(j)) {
job_write(pfdev, JS_COMMAND_NEXT(j), JS_COMMAND_NOP);
@@ -447,20 +494,25 @@ static irqreturn_t panfrost_job_irq_handler(int irq, void *data)
job_read(pfdev, JS_TAIL_LO(j)));
drm_sched_fault(&pfdev->js->queue[j].sched);
+ jobs --;
}
- if (status & JOB_INT_MASK_DONE(j)) {
- struct panfrost_job *job = pfdev->jobs[j];
+ while (jobs -- > active) {
+ struct panfrost_job *job =
+ panfrost_dequeue_job(pfdev, j);
- pfdev->jobs[j] = NULL;
panfrost_mmu_as_put(pfdev, &job->file_priv->mmu);
- panfrost_devfreq_record_transition(pfdev, j);
dma_fence_signal(job->done_fence);
}
+ if (!active)
+ panfrost_devfreq_record_transition(pfdev, j);
+
status &= ~mask;
}
+ spin_unlock_irqrestore(&pfdev->hwaccess_lock, flags);
+
return IRQ_HANDLED;
}
@@ -491,7 +543,7 @@ int panfrost_job_init(struct panfrost_device *pfdev)
ret = drm_sched_init(&js->queue[j].sched,
&panfrost_sched_ops,
- 1, 0, msecs_to_jiffies(500),
+ 2, 0, msecs_to_jiffies(500),
"pan_js");
if (ret) {
dev_err(pfdev->dev, "Failed to create scheduler: %d.", ret);
diff --git a/drivers/gpu/drm/panfrost/panfrost_mmu.c b/drivers/gpu/drm/panfrost/panfrost_mmu.c
index f22d8f02568d..c25fd88ef437 100644
--- a/drivers/gpu/drm/panfrost/panfrost_mmu.c
+++ b/drivers/gpu/drm/panfrost/panfrost_mmu.c
@@ -147,7 +147,7 @@ u32 panfrost_mmu_as_get(struct panfrost_device *pfdev, struct panfrost_mmu *mmu)
as = mmu->as;
if (as >= 0) {
int en = atomic_inc_return(&mmu->as_count);
- WARN_ON(en >= NUM_JOB_SLOTS);
+ WARN_ON(en >= NUM_JOB_SLOTS*2);
list_move(&mmu->list, &pfdev->as_lru_list);
goto out;
--
2.20.1