drm/nvc0/bus: report useful data on mmio fault

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

diff --git a/drivers/gpu/drm/nouveau/core/subdev/bus/nvc0.c b/drivers/gpu/drm/nouveau/core/subdev/bus/nvc0.c
index 10d95f5..b192d62 100644 (file)
--- a/drivers/gpu/drm/nouveau/core/subdev/bus/nvc0.c
+++ b/drivers/gpu/drm/nouveau/core/subdev/bus/nvc0.c
@@ -36,12 +36,17 @@ nvc0_bus_intr(struct nouveau_subdev *subdev)
        u32 stat = nv_rd32(pbus, 0x001100) & nv_rd32(pbus, 0x001140);
 
        if (stat & 0x0000000e) {
-               nv_error(pbus, "MMIO FAULT [");
-               if (stat & 0x00000002) pr_cont(" !ENGINE");
-               if (stat & 0x00000004) pr_cont(" IBUS");
-               if (stat & 0x00000004) pr_cont(" TIMEOUT");
-               pr_cont("]\n");
+               u32 addr = nv_rd32(pbus, 0x009084);
+               u32 data = nv_rd32(pbus, 0x009088);
 
+               nv_error(pbus, "MMIO %s of 0x%08x FAULT at 0x%06x [ %s%s%s]\n",
+                        (addr & 0x00000002) ? "write" : "read", data,
+                        (addr & 0x00fffffc),
+                        (stat & 0x00000002) ? "!ENGINE " : "",
+                        (stat & 0x00000004) ? "IBUS " : "",
+                        (stat & 0x00000008) ? "TIMEOUT " : "");
+
+               nv_wr32(pbus, 0x009084, 0x00000000);
                nv_wr32(pbus, 0x001100, (stat & 0x0000000e));
                stat &= ~0x0000000e;
        }