diff options
Diffstat (limited to 'drivers/gpu/drm/radeon/radeon_ring.c')
| -rw-r--r-- | drivers/gpu/drm/radeon/radeon_ring.c | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/drivers/gpu/drm/radeon/radeon_ring.c b/drivers/gpu/drm/radeon/radeon_ring.c index 1b020ef7fcdd..203ec1f6bbb9 100644 --- a/drivers/gpu/drm/radeon/radeon_ring.c +++ b/drivers/gpu/drm/radeon/radeon_ring.c @@ -396,6 +396,59 @@ void radeon_ring_unlock_undo(struct radeon_device *rdev, struct radeon_ring *rin 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) |