drm/panfrost: Kill in-flight jobs on FD close

If the process who submitted these jobs decided to close the FD before
the jobs are done it probably means it doesn't care about the result.

v5:
* Add a panfrost_exception_is_fault() helper and the
  DRM_PANFROST_EXCEPTION_MAX_NON_FAULT value

v4:
* Don't disable/restore irqs when taking the job_lock (not needed since
  this lock is never taken from an interrupt context)

v3:
* Set fence error to ECANCELED when a TERMINATED exception is received
Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
Reviewed-by: Steven Price <steven.price@arm.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210630062751.2832545-15-boris.brezillon@collabora.com

drivers/gpu/drm/panfrost/panfrost_device.h

@@ -184,6 +184,7 @@ enum drm_panfrost_exception_type {
 	DRM_PANFROST_EXCEPTION_KABOOM = 0x05,
 	DRM_PANFROST_EXCEPTION_EUREKA = 0x06,
 	DRM_PANFROST_EXCEPTION_ACTIVE = 0x08,
+	DRM_PANFROST_EXCEPTION_MAX_NON_FAULT = 0x3f,
 	DRM_PANFROST_EXCEPTION_JOB_CONFIG_FAULT = 0x40,
 	DRM_PANFROST_EXCEPTION_JOB_POWER_FAULT = 0x41,
 	DRM_PANFROST_EXCEPTION_JOB_READ_FAULT = 0x42,
@@ -244,6 +245,12 @@ enum drm_panfrost_exception_type {
 	DRM_PANFROST_EXCEPTION_MEM_ATTR_NONCACHE_3 = 0xef,
 };
 
+static inline bool
+panfrost_exception_is_fault(u32 exception_code)
+{
+	return exception_code > DRM_PANFROST_EXCEPTION_MAX_NON_FAULT;
+}
+
 const char *panfrost_exception_name(u32 exception_code);
 bool panfrost_exception_needs_reset(const struct panfrost_device *pfdev,
 				    u32 exception_code);

drivers/gpu/drm/panfrost/panfrost_job.c

@@ -483,14 +483,21 @@ static void panfrost_job_handle_irq(struct panfrost_device *pfdev, u32 status)
 
 		if (status & JOB_INT_MASK_ERR(j)) {
 			u32 js_status = job_read(pfdev, JS_STATUS(j));
+			const char *exception_name = panfrost_exception_name(js_status);
 
 			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(js_status),
-				job_read(pfdev, JS_HEAD_LO(j)),
-				job_read(pfdev, JS_TAIL_LO(j)));
+			if (!panfrost_exception_is_fault(js_status)) {
+				dev_dbg(pfdev->dev, "js interrupt, js=%d, status=%s, head=0x%x, tail=0x%x",
+					j, exception_name,
+					job_read(pfdev, JS_HEAD_LO(j)),
+					job_read(pfdev, JS_TAIL_LO(j)));
+			} else {
+				dev_err(pfdev->dev, "js fault, js=%d, status=%s, head=0x%x, tail=0x%x",
+					j, exception_name,
+					job_read(pfdev, JS_HEAD_LO(j)),
+					job_read(pfdev, JS_TAIL_LO(j)));
+			}
 
 			/* If we need a reset, signal it to the timeout
 			 * handler, otherwise, update the fence error field and
@@ -499,7 +506,16 @@ static void panfrost_job_handle_irq(struct panfrost_device *pfdev, u32 status)
 			if (panfrost_exception_needs_reset(pfdev, js_status)) {
 				drm_sched_fault(&pfdev->js->queue[j].sched);
 			} else {
-				dma_fence_set_error(pfdev->jobs[j]->done_fence, -EINVAL);
+				int error = 0;
+
+				if (js_status == DRM_PANFROST_EXCEPTION_TERMINATED)
+					error = -ECANCELED;
+				else if (panfrost_exception_is_fault(js_status))
+					error = -EINVAL;
+
+				if (error)
+					dma_fence_set_error(pfdev->jobs[j]->done_fence, error);
+
 				status |= JOB_INT_MASK_DONE(j);
 			}
 		}
@@ -665,10 +681,24 @@ int panfrost_job_open(struct panfrost_file_priv *panfrost_priv)
 
 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];
+		struct panfrost_job *job = pfdev->jobs[i];
+
+		if (!job || job->base.entity != entity)
+			continue;
+
+		job_write(pfdev, JS_COMMAND(i), JS_COMMAND_HARD_STOP);
+	}
+	spin_unlock(&pfdev->js->job_lock);
 }
 
 int panfrost_job_is_idle(struct panfrost_device *pfdev)