Date: Mon, 16 Sep 2019 14:35:03 +0000 (UTC) From: Andrew Turner <andrew@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-12@freebsd.org Subject: svn commit: r352399 - stable/12/sys/arm64/arm64 Message-ID: <201909161435.x8GEZ3dj031117@repo.freebsd.org>
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Author: andrew Date: Mon Sep 16 14:35:02 2019 New Revision: 352399 URL: https://svnweb.freebsd.org/changeset/base/352399 Log: MFC r339948: Use pmap_invalidate_all rather than invalidating 512 level 2 entries in the early pmap_mapbios/unmapbios code. It is even worse when there are multiple L2 entries to handle as we would need to iterate over all pages. Sponsored by: DARPA, AFRL Modified: stable/12/sys/arm64/arm64/pmap.c Directory Properties: stable/12/ (props changed) Modified: stable/12/sys/arm64/arm64/pmap.c ============================================================================== --- stable/12/sys/arm64/arm64/pmap.c Mon Sep 16 14:34:10 2019 (r352398) +++ stable/12/sys/arm64/arm64/pmap.c Mon Sep 16 14:35:02 2019 (r352399) @@ -4869,11 +4869,11 @@ pmap_mapbios(vm_paddr_t pa, vm_size_t size) pmap_load_store(l2, pa | ATTR_DEFAULT | ATTR_XN | ATTR_IDX(CACHED_MEMORY) | L2_BLOCK); - pmap_invalidate_range(kernel_pmap, va, va + L2_SIZE); va += L2_SIZE; pa += L2_SIZE; } + pmap_invalidate_all(kernel_pmap); va = preinit_map_va + (start_idx * L2_SIZE); @@ -4906,12 +4906,14 @@ pmap_unmapbios(vm_offset_t va, vm_size_t size) pd_entry_t *pde; pt_entry_t *l2; int i, lvl, l2_blocks, block; + bool preinit_map; l2_blocks = (roundup2(va + size, L2_SIZE) - rounddown2(va, L2_SIZE)) >> L2_SHIFT; KASSERT(l2_blocks > 0, ("pmap_unmapbios: invalid size %lx", size)); /* Remove preinit mapping */ + preinit_map = false; block = 0; for (i = 0; i < PMAP_PREINIT_MAPPING_COUNT; i++) { ppim = pmap_preinit_mapping + i; @@ -4921,6 +4923,7 @@ pmap_unmapbios(vm_offset_t va, vm_size_t size) ppim->va = 0; ppim->pa = 0; ppim->size = 0; + preinit_map = true; offset = block * L2_SIZE; va_trunc = rounddown2(va, L2_SIZE) + offset; @@ -4931,13 +4934,15 @@ pmap_unmapbios(vm_offset_t va, vm_size_t size) va_trunc)); l2 = pmap_l1_to_l2(pde, va_trunc); pmap_clear(l2); - pmap_invalidate_range(kernel_pmap, va_trunc, - va_trunc + L2_SIZE); if (block == (l2_blocks - 1)) - return; + break; block++; } + } + if (preinit_map) { + pmap_invalidate_all(kernel_pmap); + return; } /* Unmap the pages reserved with kva_alloc. */
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