Date: Sat, 13 May 2017 13:01:15 +0000 (UTC) From: Andrew Turner <andrew@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r318252 - head/sys/arm64/include Message-ID: <201705131301.v4DD1FBc038256@repo.freebsd.org>
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Author: andrew Date: Sat May 13 13:01:15 2017 New Revision: 318252 URL: https://svnweb.freebsd.org/changeset/base/318252 Log: Add the VM_MEMATTR_WRITE_THROUGH memory type to arm64 and use it to support VM_MEMATTR_WRITE_COMBINING in the kernel. This fixes a bug where Xorg would use write back cached memory for its graphics buffers. This would produce artifacts on the screen as cachelines were written to memory. MFC after: 1 week Sponsored by: DARPA, AFRL Modified: head/sys/arm64/include/vm.h Modified: head/sys/arm64/include/vm.h ============================================================================== --- head/sys/arm64/include/vm.h Sat May 13 10:00:24 2017 (r318251) +++ head/sys/arm64/include/vm.h Sat May 13 13:01:15 2017 (r318252) @@ -30,9 +30,15 @@ #define _MACHINE_VM_H_ /* Memory attribute configuration. */ -#define VM_MEMATTR_DEVICE 0 -#define VM_MEMATTR_UNCACHEABLE 1 -#define VM_MEMATTR_WRITE_BACK 2 +#define VM_MEMATTR_DEVICE 0 +#define VM_MEMATTR_UNCACHEABLE 1 +#define VM_MEMATTR_WRITE_BACK 2 +#define VM_MEMATTR_WRITE_THROUGH 3 + +#ifdef _KERNEL +/* If defined vmstat will try to use both of these in a switch statement */ +#define VM_MEMATTR_WRITE_COMBINING VM_MEMATTR_WRITE_THROUGH +#endif #define VM_MEMATTR_DEFAULT VM_MEMATTR_WRITE_BACK
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