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Mikulas Patocka c81e34c434 alpha: fix memory barriers so that they conform to the specification 
commit 54505a1e20 upstream.

The commits cd0e00c106 and 92d7223a74 broke boot on the Alpha Avanti
platform. The patches move memory barriers after a write before the write.
The result is that if there's iowrite followed by ioread, there is no
barrier between them.

The Alpha architecture allows reordering of the accesses to the I/O space,
and the missing barrier between write and read causes hang with serial
port and real time clock.

This patch makes barriers confiorm to the specification.

1. We add mb() before readX_relaxed and writeX_relaxed -
   memory-barriers.txt claims that these functions must be ordered w.r.t.
   each other. Alpha doesn't order them, so we need an explicit barrier.
2. We add mb() before reads from the I/O space - so that if there's a
   write followed by a read, there should be a barrier between them.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Fixes: cd0e00c106 ("alpha: io: reorder barriers to guarantee writeX() and iowriteX() ordering")
Fixes: 92d7223a74 ("alpha: io: reorder barriers to guarantee writeX() and iowriteX() ordering #2")
Cc: stable@vger.kernel.org      # v4.17+
Acked-by: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Reviewed-by: Maciej W. Rozycki <macro@linux-mips.org>
Signed-off-by: Matt Turner <mattst88@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 		2020-06-22 09:31:21 +02:00
..
syscalls arch: mark syscall number 435 reserved for clone3 2019-07-15 00:39:33 +02:00
.gitignore alpha: .gitignore vmlinux.lds 2009-01-15 16:39:40 -08:00
Makefile alpha: Implement CPU vulnerabilities sysfs functions. 2018-04-07 15:04:04 -07:00
asm-offsets.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
audit.c alpha: Enable system-call auditing support. 2014-01-31 09:21:55 -08:00
binfmt_loader.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
bugs.c alpha: Implement CPU vulnerabilities sysfs functions. 2018-04-07 15:04:04 -07:00
console.c vgacon: Set VGA struct resource types 2017-12-18 23:07:43 -06:00
core_apecs.c memblock: stop using implicit alignment to SMP_CACHE_BYTES 2018-10-31 08:54:16 -07:00
core_cia.c treewide: add checks for the return value of memblock_alloc*() 2019-03-12 10:04:02 -07:00
core_irongate.c mm: remove include/linux/bootmem.h 2018-10-31 08:54:16 -07:00
core_lca.c memblock: stop using implicit alignment to SMP_CACHE_BYTES 2018-10-31 08:54:16 -07:00
core_marvel.c treewide: add checks for the return value of memblock_alloc*() 2019-03-12 10:04:02 -07:00
core_mcpcia.c memblock: stop using implicit alignment to SMP_CACHE_BYTES 2018-10-31 08:54:16 -07:00
core_polaris.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
core_t2.c memblock: stop using implicit alignment to SMP_CACHE_BYTES 2018-10-31 08:54:16 -07:00
core_titan.c memblock: stop using implicit alignment to SMP_CACHE_BYTES 2018-10-31 08:54:16 -07:00
core_tsunami.c memblock: stop using implicit alignment to SMP_CACHE_BYTES 2018-10-31 08:54:16 -07:00
core_wildfire.c alpha: fix spelling mistake QSD_PORT_ACTUVE -> QSD_PORT_ACTIVE 2018-12-21 11:57:57 -05:00
entry.S alpha: unify the glue for sigreturn-like syscalls 2018-08-16 21:03:35 -04:00
err_common.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
err_ev6.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
err_ev7.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
err_impl.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
err_marvel.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
err_titan.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
es1888.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
gct.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
head.S License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
io.c alpha: fix memory barriers so that they conform to the specification 2020-06-22 09:31:21 +02:00
irq.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
irq_alpha.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
irq_i8259.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
irq_impl.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
irq_pyxis.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
irq_srm.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
machvec_impl.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
module.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156 2019-05-30 11:26:35 -07:00
osf_sys.c timex: use __kernel_timex internally 2019-02-07 00:13:27 +01:00
pc873xx.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
pc873xx.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
pci-noop.c treewide: add checks for the return value of memblock_alloc*() 2019-03-12 10:04:02 -07:00
pci-sysfs.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
pci.c treewide: add checks for the return value of memblock_alloc*() 2019-03-12 10:04:02 -07:00
pci_impl.h alpha: fix reboot on Avanti platform 2018-01-20 17:01:10 -08:00
pci_iommu.c dma-mapping: explicitly wire up ->mmap and ->get_sgtable 2019-09-04 11:13:18 +02:00
perf_event.c perf/core, arch/alpha: Strengthen exclusion checks with PERF_PMU_CAP_NO_EXCLUDE 2019-01-21 11:01:21 +01:00
process.c alpha: fix crash if pthread_create races with signal delivery 2018-01-20 17:01:16 -08:00
proto.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
ptrace.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
rtc.c alpha: rtc: simplify alpha_rtc_init 2018-12-21 11:57:57 -05:00
setup.c arch: use memblock_alloc() instead of memblock_alloc_from(size, align, 0) 2019-03-12 10:04:01 -07:00
signal.c signal: Remove task parameter from force_sig 2019-05-27 09:36:28 -05:00
smc37c93x.c arch: mostly remove <asm/segment.h> 2019-04-23 21:51:40 +02:00
smc37c669.c arch: mostly remove <asm/segment.h> 2019-04-23 21:51:40 +02:00
smp.c smp: Remove smp_call_function() and on_each_cpu() return values 2019-06-23 14:26:26 +02:00
srm_env.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 333 2019-06-05 17:37:06 +02:00
srmcons.c treewide: setup_timer() -> timer_setup() 2017-11-21 15:57:07 -08:00
sys_alcor.c License cleanup: add SPDX license identifiers to some files 2017-11-02 10:04:46 -07:00
sys_cabriolet.c License cleanup: add SPDX license identifiers to some files 2017-11-02 10:04:46 -07:00
sys_dp264.c License cleanup: add SPDX license identifiers to some files 2017-11-02 10:04:46 -07:00
sys_eb64p.c License cleanup: add SPDX license identifiers to some files 2017-11-02 10:04:46 -07:00
sys_eiger.c License cleanup: add SPDX license identifiers to some files 2017-11-02 10:04:46 -07:00
sys_jensen.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
sys_marvel.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
sys_miata.c License cleanup: add SPDX license identifiers to some files 2017-11-02 10:04:46 -07:00
sys_mikasa.c License cleanup: add SPDX license identifiers to some files 2017-11-02 10:04:46 -07:00
sys_nautilus.c mm: remove include/linux/bootmem.h 2018-10-31 08:54:16 -07:00
sys_noritake.c License cleanup: add SPDX license identifiers to some files 2017-11-02 10:04:46 -07:00
sys_rawhide.c License cleanup: add SPDX license identifiers to some files 2017-11-02 10:04:46 -07:00
sys_ruffian.c License cleanup: add SPDX license identifiers to some files 2017-11-02 10:04:46 -07:00
sys_rx164.c License cleanup: add SPDX license identifiers to some files 2017-11-02 10:04:46 -07:00
sys_sable.c License cleanup: add SPDX license identifiers to some files 2017-11-02 10:04:46 -07:00
sys_sio.c alpha/PCI: Fix noname IRQ level detection 2018-01-20 16:22:36 -08:00
sys_sx164.c License cleanup: add SPDX license identifiers to some files 2017-11-02 10:04:46 -07:00
sys_takara.c License cleanup: add SPDX license identifiers to some files 2017-11-02 10:04:46 -07:00
sys_titan.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
sys_wildfire.c License cleanup: add SPDX license identifiers to some files 2017-11-02 10:04:46 -07:00
systbls.S alpha: generate uapi header and syscall table header files 2018-12-21 11:57:56 -05:00
time.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
traps.c signal: Remove the task parameter from force_sig_fault 2019-05-29 09:31:43 -05:00
vmlinux.lds.S License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00