Kenneth Graunke
c3701e9070
Adapted from Chris Wilson's patch. The comment is largely his. Currently, when iris hangs the GPU, it will continue sending batches which incrementally update the state, assuming it's preserved across batches. However, the kernel's GPU reset support reinitializes the guilty context to the default GPU state (reasonably not wanting to trust the current state). This ends up resetting critical things like STATE_BASE_ADDRESS, causing memory accesses in all subsequent batches to be garbage, and almost certainly result in more hangs until we're banned or we kill the machine. We now ask the kernel to ban our render context immediately, so we notice we've gone off the rails as fast as possible. Eventually, we'll attempt to recover and continue. For now, we just avoid torching the GPU over and over.
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