From 8eec7acbb922b3d99d0e63fc19f66d08d09db874 Mon Sep 17 00:00:00 2001 From: royger Date: Thu, 13 Sep 2018 07:04:00 +0000 Subject: [PATCH] x86bios: use M_NOWAIT with mallocs Or else it triggers the following bug: APIC: CPU 6 has ACPI ID 6 APIC: CPU 7 has ACPI ID 7 panic: vm_wait in early boot cpuid = 0 time = 1 KDB: stack backtrace: db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xffffffff826ff8d0 vpanic() at vpanic+0x1a3/frame 0xffffffff826ff930 panic() at panic+0x43/frame 0xffffffff826ff990 vm_wait_domain() at vm_wait_domain+0xf9/frame 0xffffffff826ff9c0 kmem_alloc_contig_domain() at kmem_alloc_contig_domain+0x252/frame 0xffffffff826ffa50 kmem_alloc_contig() at kmem_alloc_contig+0x6c/frame 0xffffffff826ffad0 contigmalloc() at contigmalloc+0x2e/frame 0xffffffff826ffb00 x86bios_modevent() at x86bios_modevent+0x225/frame 0xffffffff826ffb20 module_register_init() at module_register_init+0xc0/frame 0xffffffff826ffb50 mi_startup() at mi_startup+0x118/frame 0xffffffff826ffb70 start_kernel() at start_kernel+0x10 While there also make x86bios_unmap_mem idempotent. Reviewed by: kib Approved by: re (gjb) Sponsored by: Citrix Systems R&D Differential revision: https://reviews.freebsd.org/D17000 --- sys/compat/x86bios/x86bios.c | 25 +++++++++++++++++++------ 1 file changed, 19 insertions(+), 6 deletions(-) diff --git a/sys/compat/x86bios/x86bios.c b/sys/compat/x86bios/x86bios.c index d9917383d13d..542f04cc0b0d 100644 --- a/sys/compat/x86bios/x86bios.c +++ b/sys/compat/x86bios/x86bios.c @@ -656,17 +656,24 @@ static __inline void x86bios_unmap_mem(void) { - free(x86bios_map, M_DEVBUF); - if (x86bios_ivt != NULL) + if (x86bios_map != NULL) { + free(x86bios_map, M_DEVBUF); + x86bios_map = NULL; + } + if (x86bios_ivt != NULL) { #ifdef X86BIOS_NATIVE_ARCH pmap_unmapbios((vm_offset_t)x86bios_ivt, X86BIOS_IVT_SIZE); #else free(x86bios_ivt, M_DEVBUF); + x86bios_ivt = NULL; #endif + } if (x86bios_rom != NULL) pmap_unmapdev((vm_offset_t)x86bios_rom, X86BIOS_ROM_SIZE); - if (x86bios_seg != NULL) + if (x86bios_seg != NULL) { contigfree(x86bios_seg, X86BIOS_SEG_SIZE, M_DEVBUF); + x86bios_seg = NULL; + } } static __inline int @@ -674,7 +681,9 @@ x86bios_map_mem(void) { x86bios_map = malloc(sizeof(*x86bios_map) * X86BIOS_PAGES, M_DEVBUF, - M_WAITOK | M_ZERO); + M_NOWAIT | M_ZERO); + if (x86bios_map == NULL) + goto fail; #ifdef X86BIOS_NATIVE_ARCH x86bios_ivt = pmap_mapbios(X86BIOS_IVT_BASE, X86BIOS_IVT_SIZE); @@ -688,7 +697,9 @@ x86bios_map_mem(void) rounddown(x86bios_rom_phys, X86BIOS_PAGE_SIZE); else #else - x86bios_ivt = malloc(X86BIOS_IVT_SIZE, M_DEVBUF, M_ZERO | M_WAITOK); + x86bios_ivt = malloc(X86BIOS_IVT_SIZE, M_DEVBUF, M_NOWAIT | M_ZERO); + if (x86bios_ivt == NULL) + goto fail; #endif x86bios_rom_phys = X86BIOS_ROM_BASE; @@ -703,8 +714,10 @@ x86bios_map_mem(void) goto fail; #endif - x86bios_seg = contigmalloc(X86BIOS_SEG_SIZE, M_DEVBUF, M_WAITOK, + x86bios_seg = contigmalloc(X86BIOS_SEG_SIZE, M_DEVBUF, M_NOWAIT, X86BIOS_RAM_BASE, x86bios_rom_phys, X86BIOS_PAGE_SIZE, 0); + if (x86bios_seg == NULL) + goto fail; x86bios_seg_phys = vtophys(x86bios_seg); x86bios_set_pages((vm_offset_t)x86bios_ivt, X86BIOS_IVT_BASE,