Author: jhibbits
Date: Thu Aug 15 03:42:15 2019
New Revision: 351065
URL: https://svnweb.freebsd.org/changeset/base/351065
Log:
powerpc/pmap: Enable UMA_MD_SMALL_ALLOC for 64-bit booke
The only thing blocking UMA_MD_SMALL_ALLOC from working on 64-bit booke
powerpc was a missing check in pmap_kextract(). Adding DMAP handling into
pmap_kextract(), we can now use UMA_MD_SMALL_ALLOC. This should improve
performance and stability a bit, since DMAP is always mapped in TLB1, so
this relieves pressure on TLB0.
MFC after: 3 weeks
Modified:
head/sys/powerpc/booke/pmap.c
head/sys/powerpc/include/vmparam.h
Modified: head/sys/powerpc/booke/pmap.c
==============================================================================
--- head/sys/powerpc/booke/pmap.c Thu Aug 15 02:30:44 2019
(r351064)
+++ head/sys/powerpc/booke/pmap.c Thu Aug 15 03:42:15 2019
(r351065)
@@ -1958,6 +1958,11 @@ mmu_booke_kextract(mmu_t mmu, vm_offset_t va)
vm_paddr_t p = 0;
int i;
+#ifdef __powerpc64__
+ if (va >= DMAP_BASE_ADDRESS && va <= DMAP_MAX_ADDRESS)
+ return (DMAP_TO_PHYS(va));
+#endif
+
if (va >= VM_MIN_KERNEL_ADDRESS && va <= VM_MAX_KERNEL_ADDRESS)
p = pte_vatopa(mmu, kernel_pmap, va);
Modified: head/sys/powerpc/include/vmparam.h
==============================================================================
--- head/sys/powerpc/include/vmparam.h Thu Aug 15 02:30:44 2019
(r351064)
+++ head/sys/powerpc/include/vmparam.h Thu Aug 15 03:42:15 2019
(r351065)
@@ -133,6 +133,11 @@
#else /* Book-E */
+/* Use the direct map for UMA small allocs on powerpc64. */
+#ifdef __powerpc64__
+#define UMA_MD_SMALL_ALLOC
+#endif
+
#define KERNBASE 0x04000100 /* start of kernel
physical */
#ifndef __powerpc64__
#define VM_MIN_KERNEL_ADDRESS 0xc0000000
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