On Mon, Jul 18, 2016 at 10:31:05AM +0100, Tvrtko Ursulin wrote: > On 16/07/16 16:44, Chris Wilson wrote: > Is it okay nowadays to just use these registers in the kernel? > > Many years ago when I last looked into this FPU and MMX registers > were discouraged against and needed explicit kernel_gpu_begin/end > around the block. Since they were not saved/restored by the kernel > and doing otherwise would mess up the userspace context. > > Perhaps these new registers are different or the things have > generally changed since then? Hmm, I thought kernel_fpu_begin() was explicitly to handle the lack of context save/restore of the FPU registers (a different block to the xmm registers). However, I missed that the existing sse2/avx2 also uses it. -Chris -- Chris Wilson, Intel Open Source Technology Centre _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/intel-gfx
