[PATCH 1/4] drm/panthor: Force an immediate reset on unrecoverable faults

[Boris Brezillon]

If the FW reports an unrecoverable fault, we need to reset the GPU
before we can start re-using it again.

Signed-off-by: Boris Brezillon <boris.brezil...@collabora.com>
---
 drivers/gpu/drm/panthor/panthor_device.c |  1 +
 drivers/gpu/drm/panthor/panthor_device.h |  1 +
 drivers/gpu/drm/panthor/panthor_sched.c  | 11 ++++++++++-
 3 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/panthor/panthor_device.c 
b/drivers/gpu/drm/panthor/panthor_device.c
index 75276cbeba20..4c5b54e7abb7 100644
--- a/drivers/gpu/drm/panthor/panthor_device.c
+++ b/drivers/gpu/drm/panthor/panthor_device.c
@@ -293,6 +293,7 @@ static const struct panthor_exception_info 
panthor_exception_infos[] = {
        PANTHOR_EXCEPTION(ACTIVE),
        PANTHOR_EXCEPTION(CS_RES_TERM),
        PANTHOR_EXCEPTION(CS_CONFIG_FAULT),
+       PANTHOR_EXCEPTION(CS_UNRECOVERABLE),
        PANTHOR_EXCEPTION(CS_ENDPOINT_FAULT),
        PANTHOR_EXCEPTION(CS_BUS_FAULT),
        PANTHOR_EXCEPTION(CS_INSTR_INVALID),
diff --git a/drivers/gpu/drm/panthor/panthor_device.h 
b/drivers/gpu/drm/panthor/panthor_device.h
index 2fdd671b38fd..e388c0472ba7 100644
--- a/drivers/gpu/drm/panthor/panthor_device.h
+++ b/drivers/gpu/drm/panthor/panthor_device.h
@@ -216,6 +216,7 @@ enum drm_panthor_exception_type {
        DRM_PANTHOR_EXCEPTION_CS_RES_TERM = 0x0f,
        DRM_PANTHOR_EXCEPTION_MAX_NON_FAULT = 0x3f,
        DRM_PANTHOR_EXCEPTION_CS_CONFIG_FAULT = 0x40,
+       DRM_PANTHOR_EXCEPTION_CS_UNRECOVERABLE = 0x41,
        DRM_PANTHOR_EXCEPTION_CS_ENDPOINT_FAULT = 0x44,
        DRM_PANTHOR_EXCEPTION_CS_BUS_FAULT = 0x48,
        DRM_PANTHOR_EXCEPTION_CS_INSTR_INVALID = 0x49,
diff --git a/drivers/gpu/drm/panthor/panthor_sched.c 
b/drivers/gpu/drm/panthor/panthor_sched.c
index 7f16a4a14e9a..1d2708c3ab0a 100644
--- a/drivers/gpu/drm/panthor/panthor_sched.c
+++ b/drivers/gpu/drm/panthor/panthor_sched.c
@@ -1281,7 +1281,16 @@ cs_slot_process_fatal_event_locked(struct panthor_device 
*ptdev,
        if (group)
                group->fatal_queues |= BIT(cs_id);
 
-       sched_queue_delayed_work(sched, tick, 0);
+       if (CS_EXCEPTION_TYPE(fatal) == DRM_PANTHOR_EXCEPTION_CS_UNRECOVERABLE) 
{
+               /* If this exception is unrecoverable, queue a reset, and make
+                * sure we stop scheduling groups until the reset has happened.
+                */
+               panthor_device_schedule_reset(ptdev);
+               cancel_delayed_work(&sched->tick_work);
+       } else {
+               sched_queue_delayed_work(sched, tick, 0);
+       }
+
        drm_warn(&ptdev->base,
                 "CSG slot %d CS slot: %d\n"
                 "CS_FATAL.EXCEPTION_TYPE: 0x%x (%s)\n"
-- 
2.44.0