drm/radeon: improve semaphore debugging on lockup

Signed-off-by: Jerome Glisse <jglisse@redhat.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/radeon/radeon.h b/drivers/gpu/drm/radeon/radeon.h
index 34e52304a525001de8bba62d71278ae939edfda9..768e8fec0099d45fb40740ad2ac535e044d96790 100644 (file)
--- a/drivers/gpu/drm/radeon/radeon.h
+++ b/drivers/gpu/drm/radeon/radeon.h
@@ -654,6 +654,8 @@ struct radeon_ring {
        u32                     ptr_reg_mask;
        u32                     nop;
        u32                     idx;
+       u64                     last_semaphore_signal_addr;
+       u64                     last_semaphore_wait_addr;
 };
 
 /*

diff --git a/drivers/gpu/drm/radeon/radeon_ring.c b/drivers/gpu/drm/radeon/radeon_ring.c
index 141f2b6a9cf2ab920ecaac2e1cbae85f57d1b904..2430d80b18716b6cd8c338c6fff86c53354992ac 100644 (file)
--- a/drivers/gpu/drm/radeon/radeon_ring.c
+++ b/drivers/gpu/drm/radeon/radeon_ring.c
@@ -784,6 +784,8 @@ static int radeon_debugfs_ring_info(struct seq_file *m, void *data)
        }
        seq_printf(m, "driver's copy of the wptr: 0x%08x [%5d]\n", ring->wptr, ring->wptr);
        seq_printf(m, "driver's copy of the rptr: 0x%08x [%5d]\n", ring->rptr, ring->rptr);
+       seq_printf(m, "last semaphore signal addr : 0x%016llx\n", ring->last_semaphore_signal_addr);
+       seq_printf(m, "last semaphore wait addr   : 0x%016llx\n", ring->last_semaphore_wait_addr);
        seq_printf(m, "%u free dwords in ring\n", ring->ring_free_dw);
        seq_printf(m, "%u dwords in ring\n", count);
        /* print 8 dw before current rptr as often it's the last executed

diff --git a/drivers/gpu/drm/radeon/radeon_semaphore.c b/drivers/gpu/drm/radeon/radeon_semaphore.c
index 97f3ece81cd257bba371c57d126bb54ddbfbee18..8dcc20f53d734ebe12b24f57b175e69988d93309 100644 (file)
--- a/drivers/gpu/drm/radeon/radeon_semaphore.c
+++ b/drivers/gpu/drm/radeon/radeon_semaphore.c
@@ -95,6 +95,10 @@ int radeon_semaphore_sync_rings(struct radeon_device *rdev,
        /* we assume caller has already allocated space on waiters ring */
        radeon_semaphore_emit_wait(rdev, waiter, semaphore);
 
+       /* for debugging lockup only, used by sysfs debug files */
+       rdev->ring[signaler].last_semaphore_signal_addr = semaphore->gpu_addr;
+       rdev->ring[waiter].last_semaphore_wait_addr = semaphore->gpu_addr;
+
        return 0;
 }