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Maciej W. Rozycki e58b77945e MIPS: DEC: Restore bootmem reservation for firmware working memory area 
commit cf3af0a4d3b62ab48e0b90180ea161d0f5d4953f upstream.

Fix a crash on DEC platforms starting with:

VFS: Mounted root (nfs filesystem) on device 0:11.
Freeing unused PROM memory: 124k freed
BUG: Bad page state in process swapper  pfn:00001
page:(ptrval) refcount:0 mapcount:-128 mapping:00000000 index:0x1 pfn:0x1
flags: 0x0()
raw: 00000000 00000100 00000122 00000000 00000001 00000000 ffffff7f 00000000
page dumped because: nonzero mapcount
Modules linked in:
CPU: 0 PID: 1 Comm: swapper Not tainted 5.9.0-00858-g865c50e1d279 #1
Stack : 8065dc48 0000000b 8065d2b8 9bc27dcc 80645bfc 9bc259a4 806a1b97 80703124
        80710000 8064a900 00000001 80099574 806b116c 1000ec00 9bc27d88 806a6f30
        00000000 00000000 80645bfc 00000000 31232039 80706ba4 2e392e35 8039f348
        2d383538 00000070 0000000a 35363867 00000000 806c2830 80710000 806b0000
        80710000 8064a900 00000001 81000000 00000000 00000000 8035af2c 80700000
        ...
Call Trace:
[<8004bc5c>] show_stack+0x34/0x104
[<8015675c>] bad_page+0xfc/0x128
[<80157714>] free_pcppages_bulk+0x1f4/0x5dc
[<801591cc>] free_unref_page+0xc0/0x130
[<8015cb04>] free_reserved_area+0x144/0x1d8
[<805abd78>] kernel_init+0x20/0x100
[<80046070>] ret_from_kernel_thread+0x14/0x1c
Disabling lock debugging due to kernel taint

caused by an attempt to free bootmem space that as from
commit b93ddc4f9156 ("mips: Reserve memory for the kernel image resources")
has not been anymore reserved due to the removal of generic MIPS arch code
that used to reserve all the memory from the beginning of RAM up to the
kernel load address.

This memory does need to be reserved on DEC platforms however as it is
used by REX firmware as working area, as per the TURBOchannel firmware
specification[1]:

Table 2-2  REX Memory Regions
-------------------------------------------------------------------------
        Starting        Ending
Region  Address         Address         Use
-------------------------------------------------------------------------
0       0xa0000000      0xa000ffff      Restart block, exception vectors,
                                        REX stack and bss
1       0xa0010000      0xa0017fff      Keyboard or tty drivers

2       0xa0018000      0xa001f3ff 1)   CRT driver

3       0xa0020000      0xa002ffff      boot, cnfg, init and t objects

4       0xa0020000      0xa002ffff      64KB scratch space
-------------------------------------------------------------------------
1) Note that the last 3 Kbytes of region 2 are reserved for backward
compatibility with previous system software.
-------------------------------------------------------------------------

(this table uses KSEG2 unmapped virtual addresses, which in the MIPS
architecture are offset from physical addresses by a fixed value of
0xa0000000 and therefore the regions referred do correspond to the
beginning of the physical address space) and we call into the firmware
on several occasions throughout the bootstrap process.  It is believed
that pre-REX firmware used with non-TURBOchannel DEC platforms has the
same requirements, as hinted by note #1 cited.

Recreate the discarded reservation then, in DEC platform code, removing
the crash.

References:

[1] "TURBOchannel Firmware Specification", On-line version,
    EK-TCAAD-FS-004, Digital Equipment Corporation, January 1993,
    Chapter 2 "System Module Firmware", p. 2-5

Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org>
Fixes: b93ddc4f9156 ("mips: Reserve memory for the kernel image resources")
Cc: stable@vger.kernel.org # v5.2+
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
 		2021-03-16 16:40:05 +08:00
..
alchemy Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
ar7 Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
ath25 Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
ath79 Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
bcm47xx Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
bcm63xx Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
bmips Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
boot MIPS: qi_lb60: Fix routing to audio amplifier 2021-03-16 16:34:06 +08:00
cavium-octeon MIPS: OCTEON: add missing put_device() call in dwc3_octeon_device_init() 2021-03-16 16:33:38 +08:00
cobalt Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
configs scsi: sr: remove references to BLK_DEV_SR_VENDOR, leave it enabled 2021-03-16 16:31:54 +08:00
crypto Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
dec MIPS: DEC: Restore bootmem reservation for firmware working memory area 2021-03-16 16:40:05 +08:00
emma Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
fw Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
generic Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
include MIPS: Add the missing 'CPU_1074K' into __get_cpu_type() 2021-03-16 16:37:36 +08:00
jazz Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
jz4740 Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
kernel MIPS: add missing MSACSR and upper MSA initialization 2021-03-16 16:35:34 +08:00
kvm KVM: MIPS: Change the definition of kvm type 2021-03-16 16:36:15 +08:00
lantiq MIPS: lantiq: xway: sysctrl: fix the GPHY clock alias names 2021-03-16 16:31:21 +08:00
lasat Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
lib Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
loongson32 Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
loongson64 Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
math-emu Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
mm MIPS: mm: BMIPS5000 has inclusive physical caches 2021-03-16 16:35:28 +08:00
mti-malta Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
net Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
netlogic Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
oprofile Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
paravirt Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
pci irqdomain/treewide: Free firmware node after domain removal 2021-03-16 16:33:54 +08:00
pic32 Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
pistachio Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
pmcs-msp71xx Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
pnx833x Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
power Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
ralink Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
rb532 Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
sgi-ip22 Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
sgi-ip27 Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
sgi-ip32 Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
sibyte Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
sni MIPS: SNI: Fix spurious interrupts 2021-03-16 16:36:18 +08:00
tools MIPS: tools: Fix resource leak in elf-entry.c 2021-03-16 16:29:34 +08:00
txx9 Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
vdso mips/vdso: Fix resource leaks in genvdso.c 2021-03-16 16:34:50 +08:00
vr41xx Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
Kbuild Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
Kbuild.platforms Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
Kconfig MIPS: SNI: Fix MIPS_L1_CACHE_SHIFT 2021-03-16 16:36:17 +08:00
Kconfig.debug Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
Makefile MIPS: Truncate link address into 32bit for 32bit kernel 2021-03-16 16:29:28 +08:00
Makefile.postlink Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00