Chris Wilson <ch...@chris-wilson.co.uk> writes: > With the introduction of per-process GTT space, the hardware designers > thought it wise to also limit the ability to write to MMIO space to only > a "secure" batch buffer. The ability to rewrite registers is the only > way to program the hardware to perform certain operations like scanline > waits (required for tear-free windowed updates). So we either have a > choice of adding an interface to perform those synchronized updates > inside the kernel, or we permit certain processes the ability to write > to the "safe" registers from within its command stream. This patch > exposes the ability to submit a SECURE batch buffer to > DRM_ROOT_ONLY|DRM_MASTER processes.
This seems like a major blow to ever getting non-root X.
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