[Bug 82455] Failed to allocate virtual address for buffer

https://bugs.freedesktop.org/show_bug.cgi?id=82455

--- Comment #21 from charlie 407883775@qq.com --- Created attachment 105313 --> https://bugs.freedesktop.org/attachment.cgi?id=105313&action=edit GPU CP LOOKUP

I am git newest mesa code, and change PAGE_SIZE alignment. I am closed all GPU DMA engine. R600_DMA=nodma. but the GPU CP is locked This time the ring index is 3. it isa DMA_INDEX_RING

[ 434.621770] radeon 0000:0a:00.0: GPU lockup CP stall for more than 5000msec [ 434.621805] radeon 0000:0a:00.0: GPU lockup (waiting for 0x0000000000000017 last fence id 0x0000000000000016) [ 434.621834] radeon 0000:0a:00.0: scheduling IB failed (-78).