On 1/12/21 5:16 AM, Konstantin Belousov wrote: > On Tue, Jan 12, 2021 at 11:43:00AM +0000, Emmanuel Vadot wrote: >> The branch main has been updated by manu: >> >> URL: >> https://cgit.FreeBSD.org/src/commit/?id=11d62b6f31ab4e99df6d0c6c23406b57eaa37f41 >> >> commit 11d62b6f31ab4e99df6d0c6c23406b57eaa37f41 >> Author: Emmanuel Vadot <m...@freebsd.org> >> AuthorDate: 2021-01-12 11:02:38 +0000 >> Commit: Emmanuel Vadot <m...@freebsd.org> >> CommitDate: 2021-01-12 11:31:00 +0000 >> >> linuxkpi: add kernel_fpu_begin/kernel_fpu_end >> >> With newer AMD GPUs (>=Navi,Renoir) there is FPU context usage in the >> amdgpu driver. >> The `kernel_fpu_begin/end` implementations in drm did not even allow >> nested >> begin-end blocks. > > Does Linux allow more then one thread to execute kernel_fpu_begin ?
I wonder if FPU_KERN_NOCTX is a better fit? https://stackoverflow.com/questions/15934615/calling-kernel-fpu-begin-twice-before-kernel-fpu-end Claims you can't nest, and the body of the functions shown disable preemption which might be a good match for FPU_KERN_NOCTX? Though I'm not sure if Linux permits sleeping while in fpu_kern_begin(). -- John Baldwin _______________________________________________ dev-commits-src-all@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/dev-commits-src-all To unsubscribe, send any mail to "dev-commits-src-all-unsubscr...@freebsd.org"
