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Maciej W. Rozycki 326f02f172 MIPS: Fix CP0 counter erratum detection for R4k CPUs 
commit f0a6c68f69981214cb7858738dd2bc81475111f7 upstream.

Fix the discrepancy between the two places we check for the CP0 counter
erratum in along with the incorrect comparison of the R4400 revision
number against 0x30 which matches none and consistently consider all
R4000 and R4400 processors affected, as documented in processor errata
publications[1][2][3], following the mapping between CP0 PRId register
values and processor models:

  PRId   |  Processor Model
---------+--------------------
00000422 | R4000 Revision 2.2
00000430 | R4000 Revision 3.0
00000440 | R4400 Revision 1.0
00000450 | R4400 Revision 2.0
00000460 | R4400 Revision 3.0

No other revision of either processor has ever been spotted.

Contrary to what has been stated in commit ce202cbb9e ("[MIPS] Assume
R4000/R4400 newer than 3.0 don't have the mfc0 count bug") marking the
CP0 counter as buggy does not preclude it from being used as either a
clock event or a clock source device.  It just cannot be used as both at
a time, because in that case clock event interrupts will be occasionally
lost, and the use as a clock event device takes precedence.

Compare against 0x4ff in `can_use_mips_counter' so that a single machine
instruction is produced.

References:

[1] "MIPS R4000PC/SC Errata, Processor Revision 2.2 and 3.0", MIPS
    Technologies Inc., May 10, 1994, Erratum 53, p.13

[2] "MIPS R4400PC/SC Errata, Processor Revision 1.0", MIPS Technologies
    Inc., February 9, 1994, Erratum 21, p.4

[3] "MIPS R4400PC/SC Errata, Processor Revision 2.0 & 3.0", MIPS
    Technologies Inc., January 24, 1995, Erratum 14, p.3

Signed-off-by: Maciej W. Rozycki <macro@orcam.me.uk>
Fixes: ce202cbb9e ("[MIPS] Assume R4000/R4400 newer than 3.0 don't have the mfc0 count bug")
Cc: stable@vger.kernel.org # v2.6.24+
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 		2022-05-12 12:25:29 +02:00
..
dec DEC: Limit PMAX memory probing to R3k systems 2022-04-08 14:39:57 +02:00
fw treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156 2019-05-30 11:26:35 -07:00
ip32
…
mach-ar7 MIPS: Add header files reference with path prefix 2020-03-19 13:12:27 +01:00
mach-ath25 MIPS: remove cpu_has_64bit_addresses 2020-04-19 16:08:29 +02:00
mach-ath79 MIPS: remove cpu_has_64bit_addresses 2020-04-19 16:08:29 +02:00
mach-au1x00 MIPS: cpu-probe: remove MIPS_CPU_BP_GHIST option bit 2020-10-12 12:05:40 +02:00
mach-bcm47xx MIPS: BCM47xx: Include bcm47xx_sprom.h 2020-08-17 13:47:51 +02:00
mach-bcm63xx MIPS: BCM63xx: fix 6328 boot selection bit 2020-05-27 12:50:15 +02:00
mach-bmips MIPS: cleanup fixup_bigphys_addr handling 2020-04-19 16:09:44 +02:00
mach-cavium-octeon MIPS: Remove mach-*/war.h 2020-09-07 22:25:27 +02:00
mach-cobalt treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 1 2019-05-21 11:28:39 +02:00
mach-db1x00
…
mach-dec MIPS: cpu-feature-overrides: Remove not needed overrides 2020-07-28 10:20:11 +02:00
mach-generic MIPS: generic: Increase NR_IRQS to 256 2020-09-18 16:33:35 +02:00
mach-ingenic MIPS: jz4740: Rename jz4740 folders to ingenic 2020-09-18 16:35:05 +02:00
mach-ip22 MIPS: Remove mach-*/war.h 2020-09-07 22:25:27 +02:00
mach-ip27 MIPS: Remove mach-*/war.h 2020-09-07 22:25:27 +02:00
mach-ip28 MIPS: SGI-IP28: disable use of ll/sc in kernel 2020-10-08 10:33:27 +02:00
mach-ip30 MIPS: SGI-IP30: Move irq bits to better header files 2020-09-21 22:15:49 +02:00
mach-ip32 MIPS: Remove mach-*/war.h 2020-09-07 22:25:27 +02:00
mach-jazz mm: don't include asm/pgtable.h if linux/mm.h is already included 2020-06-09 09:39:13 -07:00
mach-lantiq MIPS: remove cpu_has_64bit_addresses 2020-04-19 16:08:29 +02:00
mach-loongson2ef MIPS: Loongson2ef: Remove specific mc146818rtc.h 2020-08-26 12:22:38 +02:00
mach-loongson32 MIPS: Loongson{2ef, 32, 64} convert to generic fw cmdline 2019-11-11 10:44:56 -08:00
mach-loongson64 MIPS: Loongson64: Use three arguments for slti 2022-01-27 10:54:22 +01:00
mach-malta MIPS: malta: remove mach-malta/malta-dtshim.h header file 2020-09-21 22:16:47 +02:00
mach-netlogic
…
mach-pic32 MIPS: Add header files reference with path prefix 2020-03-19 13:12:27 +01:00
mach-pistachio MIPS: Add header files reference with path prefix 2020-03-19 13:12:27 +01:00
mach-ralink MIPS: remove cpu_has_64bit_addresses 2020-04-19 16:08:29 +02:00
mach-rc32434 MIPS: Remove mach-*/war.h 2020-09-07 22:25:27 +02:00
mach-rm MIPS: Remove mach-*/war.h 2020-09-07 22:25:27 +02:00
mach-sibyte MIPS: Remove mach-*/war.h 2020-09-07 22:25:27 +02:00
mach-tx39xx MIPS: io: fix sparse flood on asm/io.h 2020-06-25 10:36:39 +02:00
mach-tx49xx MIPS: Remove mach-*/war.h 2020-09-07 22:25:27 +02:00
mach-vr41xx MIPS: Add header files reference with path prefix 2020-03-19 13:12:27 +01:00
mips-boards MIPS: malta: remove mach-malta/malta-dtshim.h header file 2020-09-21 22:16:47 +02:00
netlogic MIPS: replace add_memory_region with memblock 2020-10-12 12:01:36 +02:00
octeon MIPS: Octeon: Fix build errors using clang 2022-01-27 10:54:23 +01:00
pci MIPS: PCI: Support mapping of INTB/C/D for pci-xtalk-bridge 2020-01-09 15:30:53 -08:00
sgi MIPS: SGI-IP30: Move irq bits to better header files 2020-09-21 22:15:49 +02:00
sibyte treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156 2019-05-30 11:26:35 -07:00
sn MIPS: PCI: Add detection of IOC3 on IO7, IO8, IO9 and Fuel 2020-01-24 11:37:45 -08:00
txx9 MIPS: tx49xx: move tx4939_add_memory_regions into only user 2020-10-08 10:32:51 +02:00
vdso MIPS: vdso: Invalid GIC access through VDSO 2021-07-20 16:05:59 +02:00
vr41xx treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156 2019-05-30 11:26:35 -07:00
xtalk MIPS: SGI-IP27: use generic PCI driver 2019-05-09 16:39:27 -07:00
Kbuild local64.h: make <asm/local64.h> mandatory 2021-01-12 20:18:16 +01:00
abi.h
…
addrspace.h MIPS: Remove unused R8000 CPU support 2019-07-23 14:33:51 -07:00
amon.h
…
arch_hweight.h
…
asm-eva.h MIPS: Fix typo for user_ld macro definition 2020-04-16 17:30:16 +02:00
asm-offsets.h
…
asm-prototypes.h MIPS: Export tlbmiss_handler_setup_pgd near its definition 2018-08-10 17:27:51 -07:00
asm.h MIPS: properly stop .eh_frame generation 2021-03-04 11:37:41 +01:00
asmmacro-32.h
…
asmmacro-64.h
…
asmmacro.h MIPS: fix local_irq_{disable,enable} in asmmacro.h 2021-05-14 09:50:30 +02:00
atomic.h MIPS: Compare __SYNC_loongson3_war against 0 2021-03-04 11:37:41 +01:00
barrier.h MIPS: barrier: Make __smp_mb__before_atomic() a no-op for Loongson3 2019-10-07 09:43:08 -07:00
bcache.h
…
bitops.h MIPS: bitops: Use smp_mb__before_atomic in test_* ops 2019-10-07 09:42:58 -07:00
bitrev.h
…
bmips-spaces.h
…
bmips.h MIPS: bmips: mark exception vectors as char arrays 2019-10-23 21:07:28 -07:00
bootinfo.h MIPS: replace add_memory_region with memblock 2020-10-12 12:01:36 +02:00
branch.h MIPS: Fix the declaration conflict of mm_isBranchInstr() 2020-04-24 18:17:44 +02:00
break.h
…
bug.h
…
bugs.h MIPS: r4k-bugs64: Limit R4k bug checks to affected systems 2019-10-07 09:38:53 -07:00
cache.h treewide: Convert macro and uses of __section(foo) to __section("foo") 2020-10-25 14:51:49 -07:00
cacheflush.h MIPS: Delete unused flush_cache_sigtramp() 2019-02-07 12:59:45 -08:00
cacheops.h MIPS: Rename the "Fill" cache ops to avoid build failure 2020-04-26 15:40:50 +02:00
cdmm.h
…
cevt-r4k.h
…
checksum.h mips: propagate the calling convention change down into __csum_partial_copy_..._user() 2020-08-20 15:45:20 -04:00
clocksource.h mips: Introduce asm/vdso/clocksource.h 2020-03-21 15:23:55 +01:00
cmp.h
…
cmpxchg.h MIPS: Fix assembly error from MIPSr2 code used within MIPS_ISA_ARCH_LEVEL 2021-11-18 14:04:29 +01:00
compat-signal.h
…
compat.h compat: lift compat_s64 and compat_u64 to <asm-generic/compat.h> 2020-09-17 13:00:46 -04:00
compiler.h mips: Add MIPS Release 5 support 2020-05-22 09:09:01 +02:00
cop2.h MIPS: Loongson64: Rename CPU TYPES 2019-10-31 15:03:10 -07:00
cpu-features.h MIPS: MT extensions are not available on MIPS32r1 2021-07-19 09:44:55 +02:00
cpu-info.h MIPS: emulate CPUCFG instruction on older Loongson64 cores 2020-05-24 09:26:55 +02:00
cpu-type.h MIPS: Add the missing 'CPU_1074K' into __get_cpu_type() 2020-09-23 14:48:30 +02:00
cpu.h MIPS: cpu-probe: remove MIPS_CPU_BP_GHIST option bit 2020-10-12 12:05:40 +02:00
cpufeature.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
debug.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
delay.h
…
div64.h MIPS: Avoid handcoded DIVU in `__div64_32' altogether 2021-05-19 10:13:17 +02:00
dma-coherence.h dma-mapping: move the dma_coherent flag to struct device 2018-09-20 09:01:15 +02:00
dma-direct.h dma-direct: rename and cleanup __phys_to_dma 2020-09-11 09:14:43 +02:00
dma-mapping.h dma-mapping: add a kconfig symbol for arch_setup_dma_ops availability 2019-02-13 19:12:33 +01:00
dma.h
…
dmi.h MIPS: Add support for Desktop Management Interface (DMI) 2020-03-23 15:44:05 +01:00
ds1287.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 1 2019-05-21 11:28:39 +02:00
dsemul.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
dsp.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
edac.h MIPS: Avoid using .set mips0 to restore ISA 2018-11-09 10:23:19 -08:00
elf.h MIPS: Prevent READ_IMPLIES_EXEC propagation 2020-07-16 13:18:19 +02:00
errno.h
…
eva.h
…
exec.h
…
extable.h
…
fb.h
…
fixmap.h mm: pgtable: add shortcuts for accessing kernel PMD and PTE 2020-06-09 09:39:13 -07:00
floppy.h
…
fpregdef.h
…
fpu.h mips: Add MIPS Release 5 support 2020-05-22 09:09:01 +02:00
fpu_emulator.h MIPS: Fix the declaration conflict of mm_isBranchInstr() 2020-04-24 18:17:44 +02:00
ftrace.h
…
futex.h MIPS: Convert R10000_LLSC_WAR info a config option 2020-09-07 22:24:27 +02:00
ginvt.h MIPS: mark ginvt() as __always_inline 2019-05-22 18:45:52 -07:00
gio_device.h MIPS: ip22-gio: Make gio_match_device() static 2020-01-13 10:55:40 -08:00
gt64120.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 182 2019-05-30 11:29:20 -07:00
hardirq.h
…
hazards.h mips: Add MIPS Release 5 support 2020-05-22 09:09:01 +02:00
highmem.h MIPS: Fix PKMAP with 32-bit MIPS huge page support 2021-07-14 16:56:32 +02:00
hpet.h
…
hugetlb.h hugetlb: clear huge pte during flush function on mips platform 2021-07-19 09:44:37 +02:00
hw_irq.h
…
i8259.h irqchip: Add driver for Loongson-3 HyperTransport PIC controller 2020-03-25 10:56:43 +01:00
ide.h
…
idle.h MIPS: idle: Add prototype for function check_wait 2020-09-27 13:00:45 +02:00
inst.h MIPS: Fix build warning about "PTR_STR" redefinition 2020-05-30 10:58:30 +02:00
io.h MIPS: Loongson64: Enlarge IO_SPACE_LIMIT 2020-07-28 22:49:53 +02:00
irq.h
…
irq_cpu.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
irq_gt641xx.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 1 2019-05-21 11:28:39 +02:00
irq_regs.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
irqflags.h mips: Implement arch_irqs_disabled() 2020-08-26 12:41:55 +02:00
isa-rev.h
…
isadep.h
…
jazz.h
…
jazzdma.h MIPS/jazzdma: remove the unused vdma_remap function 2020-09-11 08:13:49 +02:00
jump_label.h MIPS: jump_label: Use compact branches for >= r6 2019-04-09 16:21:30 -07:00
kdebug.h
…
kexec.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 230 2019-06-19 17:09:06 +02:00
kgdb.h
…
kmap_types.h
…
kprobes.h mm, kprobes: generalize and rename notify_page_fault() as kprobe_page_fault() 2019-07-16 19:23:22 -07:00
kvm_host.h KVM: MIPS: clean up redundant kvm_run parameters in assembly 2020-09-28 07:57:21 -04:00
kvm_types.h KVM: MIPS: Use common KVM implementation of MMU memory caches 2020-07-09 13:29:44 -04:00
linkage.h
…
llsc.h MIPS: Convert R10000_LLSC_WAR info a config option 2020-09-07 22:24:27 +02:00
local.h MIPS: Convert R10000_LLSC_WAR info a config option 2020-09-07 22:24:27 +02:00
maar.h mips: MAAR: Add XPA mode support 2020-05-19 17:39:32 +02:00
machine.h treewide: Convert macro and uses of __section(foo) to __section("foo") 2020-10-25 14:51:49 -07:00
mc146818-time.h
…
mc146818rtc.h
…
mips-cm.h mips: cm: Convert to bitfield API to fix out-of-bounds access 2021-11-18 14:04:21 +01:00
mips-cpc.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
mips-cps.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
mips-gic.h Merge branch 'irq-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2019-06-29 19:36:53 +08:00
mips-r2-to-r6-emul.h
…
mips_mt.h
…
mipsmtregs.h MIPS: Avoid using .set mips0 to restore ISA 2018-11-09 10:23:19 -08:00
mipsprom.h
…
mipsregs.h MIPS: set mips32r5 for virt extensions 2021-07-19 09:44:55 +02:00
mmiowb.h mips/mmiowb: Add unconditional mmiowb() to arch_spin_unlock() 2019-04-08 12:00:28 +01:00
mmu.h MIPS: MemoryMapID (MMID) Support 2019-02-04 10:56:41 -08:00
mmu_context.h MIPS: MemoryMapID (MMID) Support 2019-02-04 10:56:41 -08:00
mmzone.h MIPS: Only include mmzone.h when CONFIG_NEED_MULTIPLE_NODES=y 2018-11-21 19:54:59 -08:00
module.h mips: Add MIPS Warrior P5600 support 2020-05-22 09:10:53 +02:00
msa.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
msc01_ic.h
…
paccess.h
…
page.h MIPS: Use fallthrough for arch/mips 2020-05-07 11:55:47 +02:00
pci.h PCI: Convert pci_resource_to_user() to a weak function 2019-08-08 15:12:07 -05:00
perf_event.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
pgalloc.h MIPS: pgalloc: fix memory leak caused by pgd_free() 2022-04-08 14:40:21 +02:00
pgtable-32.h arch: pgtable: define MAX_POSSIBLE_PHYSMEM_BITS where needed 2020-11-16 16:57:18 +01:00
pgtable-64.h mm: consolidate pte_index() and pte_offset_*() definitions 2020-06-09 09:39:14 -07:00
pgtable-bits.h MIPS: cpu-probe: Set Ingenic's writecombine to _CACHE_CACHABLE_WA 2020-09-18 16:26:36 +02:00
pgtable.h MIPS: pgtable: Remove used PAGE_USERIO define 2020-10-06 12:34:22 +02:00
pm-cps.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
pm.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
prefetch.h
…
processor.h MIPS: process: Add prototype for function arch_dup_task_struct 2020-09-30 21:52:42 +02:00
prom.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
ptrace.h asm-generic: remove ptrace.h 2019-07-01 17:51:40 +02:00
r4k-timer.h MIPS: Correct the header guard of r4k-timer.h 2020-09-18 15:29:00 +02:00
r4kcache.h MIPS: Loongson64: Rename CPU TYPES 2019-10-31 15:03:10 -07:00
reboot.h
…
reg.h
…
regdef.h
…
rtlx.h
…
seccomp.h seccomp: Use -1 marker for end of mode 1 syscall list 2020-07-10 16:01:52 -07:00
setup.h MIPS: fix fortify panic when copying asm exception handlers 2022-04-13 21:00:59 +02:00
sgialib.h MIPS: arc: use function argument for passing argc/argv to prom_init_cmdline 2019-10-23 21:10:34 -07:00
sgiarcs.h MIPS: fw: arc: use call_o32 to call ARC prom from 64bit kernel 2019-10-09 14:55:51 -07:00
shmparam.h
…
sigcontext.h
…
signal.h
…
sim.h MIPS: Remove nabi_no_regargs 2018-08-01 13:20:15 -07:00
smp-cps.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
smp-ops.h MIPS: SGI-IP27: do boot CPU init later 2019-02-19 12:46:03 -08:00
smp.h MIPS: arch_send_call_function_single_ipi() calling conventions change 2020-04-24 18:27:51 +02:00
sni.h MIPS: Replace setup_irq() by request_irq() 2020-03-05 16:47:35 +01:00
socket.h
…
sparsemem.h
…
spinlock.h mips/mmiowb: Add unconditional mmiowb() to arch_spin_unlock() 2019-04-08 12:00:28 +01:00
spinlock_types.h
…
spram.h
…
stackframe.h MIPS: Loongson-3: Enable COP2 usage in kernel 2020-09-21 22:15:03 +02:00
stackprotector.h
…
stacktrace.h
…
string.h MIPS: Drop 32-bit asm string functions 2019-10-09 12:48:05 -07:00
switch_to.h MIPS: context switch: Use save/restore instead of set/clear for Status.CU2 2020-09-21 22:14:47 +02:00
sync.h MIPS: cavium_octeon: Fix syncw generation. 2020-02-15 12:44:03 -08:00
syscall.h MIPS/ptrace: Update mips_get_syscall_arg's return type 2019-08-11 21:44:30 -07:00
termios.h Remove 'type' argument from access_ok() function 2019-01-03 18:57:57 -08:00
thread_info.h MIPS: Avoid VDSO ABI breakage due to global register variable 2020-01-02 16:41:16 -08:00
time.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
timex.h MIPS: Fix CP0 counter erratum detection for R4k CPUs 2022-05-12 12:25:29 +02:00
tlb.h arch/tlb: Clean up simple architectures 2019-04-03 10:32:54 +02:00
tlbdebug.h
…
tlbex.h MIPS: Consistently declare TLB functions 2018-08-10 17:27:53 -07:00
tlbflush.h MIPS: mm: Remove local_flush_tlb_mm() 2019-02-04 10:56:24 -08:00
tlbmisc.h
…
topology.h
…
traps.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
txx9irq.h
…
txx9pio.h
…
txx9tmr.h
…
types.h
…
uaccess.h uaccess: remove segment_eq 2020-08-12 10:57:58 -07:00
uasm.h MIPS: uasm: Add div, mul and sel instructions for mipsr6 2019-03-19 15:26:06 -07:00
unaligned-emul.h MIPS: Fix build warning about "PTR_STR" redefinition 2020-05-30 10:58:30 +02:00
unistd.h MIPS: Wire up clone3 syscall 2019-10-02 14:06:41 -07:00
unroll.h treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
uprobes.h
…
vdso.h mips: Add support for generic vDSO 2019-07-25 21:45:05 -07:00
vermagic.h MIPS updates for v5.8: 2020-06-03 13:32:21 -07:00
vga.h
…
vmalloc.h mm/vmalloc: Add empty <asm/vmalloc.h> headers and use them from <linux/vmalloc.h> 2019-12-10 10:12:55 +01:00
vpe.h
…
war.h MIPS: Remove mach-*/war.h 2020-09-07 22:25:27 +02:00
watch.h
…
wbflush.h
…
yamon-dt.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00