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Niklas Schnelle b02002cc4c s390/pci: Implement ioremap_wc/prot() with MIO 
With our current support for the new MIO PCI instructions, write
combining/write back MMIO memory can be obtained via the pci_iomap_wc()
and pci_iomap_wc_range() functions.
This is achieved by using the write back address for a specific bar
as provided in clp_store_query_pci_fn()

These functions are however not widely used and instead drivers often
rely on ioremap_wc() and ioremap_prot(), which on other platforms enable
write combining using a PTE flag set through the pgrprot value.

While we do not have a write combining flag in the low order flag bits
of the PTE like x86_64 does, with MIO support, there is a write back bit
in the physical address (bit 1 on z15) and thus also the PTE.
Which bit is used to toggle write back and whether it is available at
all, is however not fixed in the architecture. Instead we get this
information from the CLP Store Logical Processor Characteristics for PCI
command. When the write back bit is not provided we fall back to the
existing behavior.

Signed-off-by: Niklas Schnelle <schnelle@linux.ibm.com>
Reviewed-by: Pierre Morel <pmorel@linux.ibm.com>
Reviewed-by: Gerald Schaefer <gerald.schaefer@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
2020-09-14 10:30:07 +02:00
..
ABI powerpc/perf/hv-24x7: Move cpumask file to top folder of hv-24x7 driver 2020-08-21 23:35:27 +10:00
accounting
admin-guide A set of EFI fixes: 2020-08-23 11:08:32 -07:00
arm ARM development for 5.9-rc1: 2020-08-06 10:17:00 -07:00
arm64 IOMMU Updates for Linux v5.9 2020-08-11 14:13:24 -07:00
block for-5.9/drivers-20200803 2020-08-05 10:51:40 -07:00
bpf doc: Add link to bpf helpers man page 2020-08-13 22:48:06 +02:00
cdrom A handful of obvious fixes that wandered in during the merge window. 2020-08-13 13:57:45 -07:00
core-api A handful of obvious fixes that wandered in during the merge window. 2020-08-13 13:57:45 -07:00
cpu-freq
crypto It's been a busy cycle for documentation - hopefully the busiest for a 2020-08-04 22:47:54 -07:00
dev-tools A handful of obvious fixes that wandered in during the merge window. 2020-08-13 13:57:45 -07:00
devicetree Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2020-08-23 10:52:33 -07:00
doc-guide A handful of late-arriving docs fixes, along with a patch changing a lot of 2020-06-10 14:12:15 -07:00
driver-api - Core Frameworks 2020-08-15 08:09:38 -07:00
fault-injection block: rename generic_make_request to submit_bio_noacct 2020-07-01 07:27:24 -06:00
fb drm next for 5.9-rc1 2020-08-05 19:50:06 -07:00
features s390/pci: Implement ioremap_wc/prot() with MIO 2020-09-14 10:30:07 +02:00
filesystems Improvements to ext4's block allocator performance for very large file 2020-08-21 11:03:38 -07:00
firmware-guide ACPI: Replace HTTP links with HTTPS ones 2020-07-27 14:47:08 +02:00
firmware_class
fpga Char/Misc driver patches for 5.9-rc1 2020-08-05 11:43:47 -07:00
gpu - Core Frameworks 2020-08-11 13:48:02 -07:00
hid docs: hid: Convert link to https 2020-07-13 11:26:37 -06:00
hwmon hwmon updates for v5.9 2020-08-05 13:13:57 -07:00
i2c Merge branch 'i2c/for-5.9' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux 2020-08-13 18:41:00 -07:00
ia64 docs: ia64: correct typo 2020-07-31 11:09:09 -06:00
ide
iio
infiniband RDMA/core: Remove FMR device ops 2020-06-02 20:32:54 -03:00
input Input: uinput - fix typo in function name documentation 2020-07-28 18:24:11 -07:00
isdn
kbuild Kbuild updates for v5.9 2020-08-09 14:10:26 -07:00
kernel-hacking
leds LEDs changes for 5.9-rc1. 2020-08-05 19:24:27 -07:00
litmus-tests Documentation/litmus-tests: Add note on herd7 7.56 in atomic litmus test 2020-06-29 12:05:18 -07:00
livepatch
locking A handful of obvious fixes that wandered in during the merge window. 2020-08-13 13:57:45 -07:00
m68k
maintainer Documentation: maintainer-entry-profile: eliminate duplicated word 2020-07-13 09:44:07 -06:00
mhi
mips It's been a busy cycle for documentation - hopefully the busiest for a 2020-08-04 22:47:54 -07:00
misc-devices Documentation: misc/xilinx_sdfec: eliminate duplicated word 2020-07-13 09:44:07 -06:00
netlabel
networking docs: networking: bonding.rst resources section cleanup 2020-08-14 16:44:20 -07:00
nios2
nvdimm
openrisc docs: openrisc: Replace HTTP links with HTTPS ones 2020-07-13 11:34:09 -06:00
parisc
PCI pci-v5.9-changes 2020-08-07 18:48:15 -07:00
pcmcia
power Merge branches 'pm-sleep', 'pm-domains', 'powercap' and 'pm-tools' 2020-08-03 13:12:44 +02:00
powerpc PPC KVM update for 5.9 2020-08-09 13:24:02 -04:00
process A handful of obvious fixes that wandered in during the merge window. 2020-08-13 13:57:45 -07:00
RCU These are the latest RCU bits for v5.9: 2020-08-03 14:31:33 -07:00
riscv
s390 It's been a busy cycle for documentation - hopefully the busiest for a 2020-08-04 22:47:54 -07:00
scheduler sched/doc: Factorize bits between sched-energy.rst & sched-capacity.rst 2020-08-01 09:19:43 +02:00
scsi scsi: advansys: docs: Eliminate duplicated word 2020-07-08 01:32:11 -04:00
security Documentation: security/keys: eliminate duplicated word 2020-07-13 09:45:03 -06:00
sh docs: sh: convert register-banks.txt to ReST 2020-06-19 14:10:13 -06:00
sound ASoC: Updates for v5.9 2020-08-03 14:41:43 +02:00
sparc
sphinx Replace HTTP links with HTTPS ones: Documentation/sphinx/parse-headers.pl 2020-06-26 10:57:33 -06:00
sphinx-static
spi SPI SUBSYSTEM: Replace HTTP links with HTTPS ones 2020-07-09 22:41:11 +01:00
staging remoteproc updates for v5.9 2020-08-11 11:17:45 -07:00
target doc: don't use deprecated "---help---" markers in target docs 2020-06-13 13:32:40 -07:00
timers docs: timers: drop documentation about LB_BIAS 2020-07-23 14:32:44 -06:00
trace A handful of obvious fixes that wandered in during the merge window. 2020-08-13 13:57:45 -07:00
translations A handful of obvious fixes that wandered in during the merge window. 2020-08-13 13:57:45 -07:00
usb USB: Replace HTTP links with HTTPS ones 2020-07-21 13:41:57 +02:00
userspace-api remoteproc updates for v5.9 2020-08-11 11:17:45 -07:00
virt powerpc updates for 5.9 2020-08-07 10:33:50 -07:00
vm mm/vmstat: add events for THP migration without split 2020-08-12 10:57:57 -07:00
w1
watchdog watchdog: add support for adjusting last known HW keepalive time 2020-08-05 18:43:02 +02:00
x86 It's been a busy cycle for documentation - hopefully the busiest for a 2020-08-04 22:47:54 -07:00
xtensa
.gitignore
asm-annotations.rst
atomic_bitops.txt
atomic_t.txt Documentation/litmus-tests/atomic: Add a test for smp_mb__after_atomic() 2020-06-29 12:05:18 -07:00
Changes
CodingStyle
conf.py Replace HTTP links with HTTPS ones: documentation 2020-06-08 09:30:19 -06:00
COPYING-logo Replace HTTP links with HTTPS ones: documentation 2020-06-08 09:30:19 -06:00
docutils.conf
dontdiff Documentation: dontdiff: Add zstd compressed files 2020-07-31 11:51:10 +02:00
index.rst docs: index.rst: Add watch_queue 2020-07-23 14:13:23 -06:00
Kconfig
logo.gif
Makefile media updates for v5.8-rc1 2020-06-03 20:59:38 -07:00
memory-barriers.txt powerpc updates for 5.9 2020-08-07 10:33:50 -07:00
SubmittingPatches
watch_queue.rst