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x86bios: use M_NOWAIT with mallocs

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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
This commit is contained in:
Roger Pau Monné 2018-09-13 07:04:00 +00:00
parent 219cf81b4d
commit d01d12de14
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=338623
1 changed files with 19 additions and 6 deletions
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25
sys/compat/x86bios/x86bios.c
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@ -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,