drm/radeon: move lockup detection code into radeon_ring.c
It isn't chipset specific, so it makes no sense
to have that inside r100.c.
Signed-off-by: Christian König <deathsimple@vodafone.de>
Reviewed-by: Jerome Glisse <jglisse@redhat.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
diff --git a/drivers/gpu/drm/radeon/radeon_ring.c b/drivers/gpu/drm/radeon/radeon_ring.c
index 1b020ef..203ec1f6 100644
--- a/drivers/gpu/drm/radeon/radeon_ring.c
+++ b/drivers/gpu/drm/radeon/radeon_ring.c
@@ -396,6 +396,59 @@
mutex_unlock(&ring->mutex);
}
+void radeon_ring_lockup_update(struct radeon_ring *ring)
+{
+ ring->last_rptr = ring->rptr;
+ ring->last_activity = jiffies;
+}
+
+/**
+ * radeon_ring_test_lockup() - check if ring is lockedup by recording information
+ * @rdev: radeon device structure
+ * @ring: radeon_ring structure holding ring information
+ *
+ * We don't need to initialize the lockup tracking information as we will either
+ * have CP rptr to a different value of jiffies wrap around which will force
+ * initialization of the lockup tracking informations.
+ *
+ * A possible false positivie is if we get call after while and last_cp_rptr ==
+ * the current CP rptr, even if it's unlikely it might happen. To avoid this
+ * if the elapsed time since last call is bigger than 2 second than we return
+ * false and update the tracking information. Due to this the caller must call
+ * radeon_ring_test_lockup several time in less than 2sec for lockup to be reported
+ * the fencing code should be cautious about that.
+ *
+ * Caller should write to the ring to force CP to do something so we don't get
+ * false positive when CP is just gived nothing to do.
+ *
+ **/
+bool radeon_ring_test_lockup(struct radeon_device *rdev, struct radeon_ring *ring)
+{
+ unsigned long cjiffies, elapsed;
+ uint32_t rptr;
+
+ cjiffies = jiffies;
+ if (!time_after(cjiffies, ring->last_activity)) {
+ /* likely a wrap around */
+ radeon_ring_lockup_update(ring);
+ return false;
+ }
+ rptr = RREG32(ring->rptr_reg);
+ ring->rptr = (rptr & ring->ptr_reg_mask) >> ring->ptr_reg_shift;
+ if (ring->rptr != ring->last_rptr) {
+ /* CP is still working no lockup */
+ radeon_ring_lockup_update(ring);
+ return false;
+ }
+ elapsed = jiffies_to_msecs(cjiffies - ring->last_activity);
+ if (elapsed >= 10000) {
+ dev_err(rdev->dev, "GPU lockup CP stall for more than %lumsec\n", elapsed);
+ return true;
+ }
+ /* give a chance to the GPU ... */
+ return false;
+}
+
int radeon_ring_init(struct radeon_device *rdev, struct radeon_ring *ring, unsigned ring_size,
unsigned rptr_offs, unsigned rptr_reg, unsigned wptr_reg,
u32 ptr_reg_shift, u32 ptr_reg_mask, u32 nop)