Hi, 在 2012年2月15日 下午11:53，Jerome Glisse <j.glisse@xxxxxxxxx> 写道： > To me it looks like the CP is trying to fetch memory but the > GPU memory controller fail to fullfill cp request. Did you > check the PCI configuration before & after (when things don't > work) My best guest is PCI bus mastering is no properly working > or the PCIE GPU gart table as wrong data. > > Maybe one need to drop bus master and reenable bus master to > work around some bug... Thanks for your suggestion. We've tried the 'drop and reenable master' trick, unfortunately doesn't work. The PCI configuration compare will be done later. Some additional information: The "GPU Lockup" seems always occur after tasks be restarting -- We inserted more ring tests , non of them failed before restarting tasks. BTW, I hacked GART table to try to simulate the problem: 1. Changes the system memory address(bus address) of ring_obj to an arbitrary value, e.g. 0 or 128M. 2. Changes the system memory address of a BO in radeon_test to an arbitrary value, e.g. 0 Non of above leaded to a GPU Lockup: Point 1 rendered a black screen; Point 2 only the test itself failed Any idea? Regards, -- Chen Jie _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/dri-devel
