These patches are a heavily revised version of the patches I wrote over a year ago. These patches have passed basic tests on SNB, and IVB, and older versions worked on ILK. In theory, context support should work all the way back to Gen4, but I haven't tested it. Also since I suspect ILK may be unstable, so the code has it disabled for now. HW contexts provide a way for the GPU to save an restore certain state in between batchbuffer boundaries. Typically, GPU clients must re-emit the entire state every time they run because the client does not know what has been destroyed since the last time. With these patches the driver will emit special instructions to do this on behalf of the client if it has registered a context, and included that with the batchbuffer. [... From Ken Graunke ] This is needed to properly implement Transform Feedback in the presence of Geometry Shaders, since software wouldn't be able to track the SVBI0 register to restore it to its previous state. The IOCTLs defined here may also be used with ppgtt (real ppgtt) but the interface may be insufficient for that. The contexts do provide a I've tested this with an experiemental mesa from Ken Graunke, as well as some basic i-g-t tests. i-g-t: git://people.freedesktop.org/~bwidawsk/intel-gpu-tools context_support libdrm: git://people.freedesktop.org/~bwidawsk/drm context_support kernel: git://people.freedesktop.org/~bwidawsk/drm-intel context_support I'm getting really tired of looking at these, please help me polish them up and make them more ready for consumption. I did consider moving the power context allocation to this set of APIs, but it didn't seem worth it to me. I can go either way. Ben Widawsky (11): drm/i915: MI_ARB_ON_OFF drm/i915: track tlb invalidate GFX_MODE state drm/i915: PIPE_CONTROL_TLB_INVALIDATE drm/i915/context: CXT_SIZE register offsets added drm/i915/context: Preliminary context support drm/i915/context: ringbuffer context switch code drm/i915/context: implementation details drm/i915/context: extend contexts to execbuffer2 drm/i915/context: add params drm/i915/context: track contexts per device drm/i915: show contexts in debugfs drivers/gpu/drm/i915/Makefile | 1 + drivers/gpu/drm/i915/i915_context.c | 562 ++++++++++++++++++++++++++++ drivers/gpu/drm/i915/i915_debugfs.c | 6 + drivers/gpu/drm/i915/i915_dma.c | 10 + drivers/gpu/drm/i915/i915_drv.h | 47 +++ drivers/gpu/drm/i915/i915_gem_execbuffer.c | 26 ++- drivers/gpu/drm/i915/i915_reg.h | 17 + drivers/gpu/drm/i915/intel_ringbuffer.c | 122 ++++++ drivers/gpu/drm/i915/intel_ringbuffer.h | 11 +- include/drm/i915_drm.h | 18 + 10 files changed, 815 insertions(+), 5 deletions(-) create mode 100644 drivers/gpu/drm/i915/i915_context.c -- 1.7.9
