Commit Graph

722364 Commits

Author SHA1 Message Date
Mathieu Malaterre 600ecc1936 powerpc/boot/dts: Remove leading 0x and 0s from bindings notation
Improve the DTS files by removing all the leading "0x" and zeros to
fix the following dtc warnings:

  Warning (unit_address_format): Node /XXX unit name should not have leading "0x"

and:

  Warning (unit_address_format): Node /XXX unit name should not have leading 0s

Converted using the following command:

  find . -type f \( -iname *.dts -o -iname *.dtsi \) -exec sed -E -i -e "s/@0x([0-9a-fA-F\.]+)\s?\{/@\L\1 \{/g" -e "s/@0+([0-9a-fA-F\.]+)\s?\{/@\L\1 \{/g" {} +

For simplicity, two sed expressions were used to solve each warnings
separately.

To make the regex expression more robust a few other issues were
resolved, namely setting unit-address to lower case, and adding a
whitespace before the the opening curly brace:

  https://elinux.org/Device_Tree_Linux#Linux_conventions

This is a follow up to commit 4c9847b737 ("dt-bindings: Remove
leading 0x from bindings notation")

Reported-by: David Daney <ddaney@caviumnetworks.com>
Suggested-by: Rob Herring <robh@kernel.org>
Signed-off-by: Mathieu Malaterre <malat@debian.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2018-01-21 23:37:45 +11:00
Mathieu Malaterre 00f7b29f6e backlight: Fix old-style function definition
Fix warning:

drivers/macintosh/via-pmu-backlight.c: In function ‘pmu_backlight_init’:
drivers/macintosh/via-pmu-backlight.c:140:13: warning: old-style function definition [-Wold-style-definition]
 void __init pmu_backlight_init()
             ^~~~~~~~~~~~~~~~~~

Signed-off-by: Mathieu Malaterre <malat@debian.org>
Acked-by: Daniel Thompson <daniel.thompson@linaro.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2018-01-21 23:37:44 +11:00
Mathieu Malaterre 4a7b8a4997 powerpc: Fix old-style function definition
Fix warnings such as:

arch/powerpc/platforms/powermac/backlight.c: In function ‘pmac_backlight_get_legacy_brightness’:
arch/powerpc/platforms/powermac/backlight.c:189:5: error: old-style function definition [-Werror=old-style-definition]
 int pmac_backlight_get_legacy_brightness()
     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Signed-off-by: Mathieu Malaterre <malat@debian.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2018-01-21 23:37:44 +11:00
Mathieu Malaterre 104d55ae4d powerpc/xmon: Do not compute/store the major opcode
In commit 5b102782c7 ("powerpc/xmon: Enable disassembly files (compilation
changes)") usage of variable `op` has been removed. Completely remove opcode
computation since not used anymore.

Fix fatal warning:

arch/powerpc/xmon/ppc-dis.c: In function ‘lookup_powerpc’:
arch/powerpc/xmon/ppc-dis.c:96:17: error: variable ‘op’ set but not used [-Werror=unused-but-set-variable]
   unsigned long op;
                 ^~

Signed-off-by: Mathieu Malaterre <malat@debian.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2018-01-21 23:37:43 +11:00
Mathieu Malaterre 38833faa11 powerpc/xive: Properly use static keyword for inline function
Fix fatal warning during compilation:

In file included from arch/powerpc/xmon/xmon.c:54:0:
./arch/powerpc/include/asm/xive.h:157:20: error: no previous prototype for ‘xive_smp_prepare_cpu’ [-Werror=missing-prototypes]
 extern inline int  xive_smp_prepare_cpu(unsigned int cpu) { return -EINVAL; }
                    ^

Signed-off-by: Mathieu Malaterre <malat@debian.org>
Reviewed-by: Cédric Le Goater <clg@kaod.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2018-01-21 23:37:43 +11:00
Aneesh Kumar K.V be68fb64f7 selftest/powerpc: Add additional option to mmap_bench test
This patch adds --pgfault and --iterations options to mmap_bench test. With
--pgfault we touch every page mapped. This helps in measuring impact in the
page fault path with a patch series.

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2018-01-21 23:37:43 +11:00
Aneesh Kumar K.V 10527e8081 powerpc/hash: Skip non initialized page size in init_hpte_page_sizes
One of the easiest way to test config with 4K HPTE is to disable 64K hardware
page size like below.

int __init htab_dt_scan_page_sizes(unsigned long node,

 		size -= 3; prop += 3;
 		base_idx = get_idx_from_shift(base_shift);
-		if (base_idx < 0) {
+		if (base_idx < 0 || base_idx == MMU_PAGE_64K) {
 			/* skip the pte encoding also */
 			prop += lpnum * 2; size -= lpnum * 2;

But then this results in error in other part of the code such as MPSS parsing
where we look at 4K base page size and 64K actual page size support.

This patch fix MPSS parsing by ignoring the actual page sizes marked
unsupported. In reality this can happen only with a corrupt device tree. But it
is good to tighten the error check.

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2018-01-21 23:37:42 +11:00
Michael Ellerman 4afa0f3a89 Merge branch 'next' of https://git.kernel.org/pub/scm/linux/kernel/git/scottwood/linux into next
Freescale updates from Scott:

"Contains fixes for CPM GPIO and an FSL PCI erratum workaround, plus a
 minor cleanup patch."
2018-01-21 23:32:02 +11:00
Michael Ellerman ebf0b6a8b1 Merge branch 'fixes' into next
Merge our fixes branch from the 4.15 cycle.

Unusually the fixes branch saw some significant features merged,
notably the RFI flush patches, so we want the code in next to be
tested against that, to avoid any surprises when the two are merged.

There's also some other work on the panic handling that was reverted
in fixes and we now want to do properly in next, which would conflict.

And we also fix a few other minor merge conflicts.
2018-01-21 23:21:14 +11:00
Michael Ellerman 5400fc229e Merge branch 'topic/ppc-kvm' into next
Merge the topic branch we share with kvm-ppc, this brings in two xive
commits, one from Paul to rework HMI handling, and a minor cleanup to
drop an unused flag.
2018-01-21 22:43:43 +11:00
Aneesh Kumar K.V 76b03dc07e powerpc/mm: Remove unused flag arg in global_invalidates
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2018-01-21 20:30:44 +11:00
Christophe Leroy c095ff93f9 powerpc/sysdev: change CPM GPIO to platform_device
Since commit 9427ecbed4 ("gpio: Rework of_gpiochip_set_names()
to use device property accessors"), gpio chips have to have a
parent, otherwise devprop_gpiochip_set_names() prematurely exists
with message "GPIO chip parent is NULL" and doesn't proceed
'gpio-line-names' DT property.

This patch wraps the CPM GPIO into a platform driver to allow
assignment of the parent device.

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Scott Wood <oss@buserror.net>
2018-01-20 23:29:02 -06:00
Michael Bringmann 02ef6dd810 powerpc: Enable support for ibm,drc-info devtree property
To: linuxppc-dev@lists.ozlabs.org

From: Michael Bringmann <mwb@linux.vnet.ibm.com>

Cc: Michael Bringmann <mwb@linux.vnet.ibm.com>
Cc: nfont@linux.vnet.ibm.com
Subject: [PATCH V6 4/4] powerpc: Enable support for ibm,drc-info devtree property

prom_init.c: Enable support for new DRC device tree property
"ibm,drc-info" in initial handshake between the Linux kernel and
the front end processor.

Signed-off-by: Michael Bringmann <mwb@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2018-01-21 16:21:50 +11:00
Michael Bringmann 2fcf3ae508 hotplug/drc-info: Add code to search ibm,drc-info property
rpadlpar_core.c: Provide parallel routines to search the older device-
tree properties ("ibm,drc-indexes", "ibm,drc-names", "ibm,drc-types"
and "ibm,drc-power-domains"), or the new property "ibm,drc-info".

The interface to examine the DRC information is changed from a "get"
function that returns values for local verification elsewhere, to a
"check" function that validates the 'name' and/or 'type' of a device
node.  This update hides the format of the underlying device-tree
properties, and concentrates the value checks into a single function
without requiring the user to verify whether a search was successful.

Signed-off-by: Michael Bringmann <mwb@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2018-01-21 16:21:48 +11:00
Michael Bringmann e83636ac33 pseries/drc-info: Search DRC properties for CPU indexes
pseries/drc-info: Provide parallel routines to convert between
drc_index and CPU numbers at runtime, using the older device-tree
properties ("ibm,drc-indexes", "ibm,drc-names", "ibm,drc-types"
and "ibm,drc-power-domains"), or the new property "ibm,drc-info".

Signed-off-by: Michael Bringmann <mwb@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2018-01-21 16:21:46 +11:00
Michael Bringmann 3f38000eda powerpc/firmware: Add definitions for new drc-info firmware feature
Firmware Features: Define new bit flag representing the presence of
new device tree property "ibm,drc-info".  The flag is used to tell
the front end processor whether the Linux kernel supports the new
property, and by the front end processor to tell the Linux kernel
that the new property is present in the device tree.

Signed-off-by: Michael Bringmann <mwb@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2018-01-21 16:21:40 +11:00
Vasyl Gomonovych d038386a0c powerpc/fsl_pci: Fix ptr_ret.cocci warnings
arch/powerpc/sysdev/fsl_pci.c:1307:1-3: WARNING: PTR_ERR_OR_ZERO can be used
Use PTR_ERR_OR_ZERO rather than if(IS_ERR(...)) + PTR_ERR
Generated by: scripts/coccinelle/api/ptr_ret.cocci

Signed-off-by: Vasyl Gomonovych <gomonovych@gmail.com>
Signed-off-by: Scott Wood <oss@buserror.net>
2018-01-20 23:08:46 -06:00
Joakim Tjernlund bb8651e5ce powerpc/fsl_pci: Correct fsl_pci_mcheck_exception
get_user() had it args reversed causing NIP to be NULL:ed instead
of fixing up the PCI access.

Note: This still hangs my P1020 Freescale CPU hard, but at least
I get a NIP now.

Signed-off-by: Joakim Tjernlund <joakim.tjernlund@infinera.com>
Acked-by: Li Yang <leoyang.li@nxp.com>
Signed-off-by: Scott Wood <oss@buserror.net>
2018-01-20 23:08:43 -06:00
Nicholas Piggin 723b113319 powerpc/watchdog: improve watchdog comments
The overview comments in the powerpc watchdog are out of date after
several iterations and changes of the code. Bring them up to date.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2018-01-21 15:06:26 +11:00
Christophe Leroy 8183d99f4a powerpc/lib/feature-fixups: use raw_patch_instruction()
feature fixups need to use patch_instruction() early in the boot,
even before the code is relocated to its final address, requiring
patch_instruction() to use PTRRELOC() in order to address data.

But feature fixups applies on code before it is set to read only,
even for modules. Therefore, feature fixups can use
raw_patch_instruction() instead.

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2018-01-21 15:06:25 +11:00
Christophe Leroy 8cf4c05712 powerpc/lib/code-patching: refactor patch_instruction()
patch_instruction() uses almost the same sequence as
__patch_instruction()

This patch refactor it so that patch_instruction() uses
__patch_instruction() instead of duplicating code.

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Acked-by: Balbir Singh <bsingharora@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2018-01-21 15:06:25 +11:00
Christophe Leroy 4ec591e51a powerpc: restore alphabetic order in Kconfig
This patch restores the alphabetic order which was broken by
commit 1e0fc9d1eb ("powerpc/Kconfig: Enable STRICT_KERNEL_RWX
for some configs")

Fixes: 1e0fc9d1eb ("powerpc/Kconfig: Enable STRICT_KERNEL_RWX for some configs")
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Acked-by: Balbir Singh <bsingharora@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2018-01-21 15:06:24 +11:00
Arnd Bergmann cef37ac119 powerpc/spufs: use timespec64 for timestamps
The switch log prints the tv_sec portion of timespec as a 32-bit
number, while overflows in 2106. It also uses the timespec type,
which is safe on 64-bit architectures, but deprecated because
it causes overflows in 2038 elsewhere.

This changes it to timespec64 and printing a 64-bit number for
consistency.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Jeremy Kerr <jk@ozlabs.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2018-01-21 15:06:20 +11:00
Arnd Bergmann 11ed8c5569 powerpc/mpic_timer: avoid struct timeval
In an effort to remove all instances of 'struct timeval'
from the kernel, I'm changing the powerpc mpic_timer interface
to use plain seconds instead. There is only one user of this
interface, and that doesn't use the microseconds portion, so
the code gets noticeably simpler in the process.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2018-01-21 15:06:16 +11:00
Alexey Kardashevskiy ae677ff02f powerpc/powernv/ioda: Finish removing explicit max window size check
9003a2498 removed checn from the DMA window pages allocator, however
the VFIO driver tests limits before doing so by calling
the get_table_size hook which was left behind; this fixes it.

Fixes: 9003a2498 "powerpc/powernv/ioda: Remove explicit max window size check"
Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2018-01-21 01:12:53 +11:00
Anshuman Khandual 5b2b807147 powerpc/mm: Invalidate subpage_prot() system call on radix platforms
Radix enabled platforms don't support subpage_prot() system calls. But
at present the system call goes through without an error and fails
later on while validating expected subpage accesses. Lets not allow
the system call on powerpc radix platforms to begin with to prevent
this confusion in user space.

Signed-off-by: Anshuman Khandual <khandual@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2018-01-21 01:12:21 +11:00
Ram Pai 3350eb2ea1 powerpc: sys_pkey_mprotect() system call
Patch provides the ability for a process to
associate a pkey with a address range.

Signed-off-by: Ram Pai <linuxram@us.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2018-01-21 01:06:16 +11:00
Ram Pai 9499ec1b5e powerpc: sys_pkey_alloc() and sys_pkey_free() system calls
Finally this patch provides the ability for a process to
allocate and free a protection key.

Signed-off-by: Ram Pai <linuxram@us.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2018-01-21 01:06:15 +11:00
Ram Pai cf43d3b264 powerpc: Enable pkey subsystem
PAPR defines 'ibm,processor-storage-keys' property. It exports two
values. The first value holds the number of data-access keys and the
second holds the number of instruction-access keys. Due to a bug in
the firmware, instruction-access keys is always reported as zero.
However any key can be configured to disable data-access and/or
disable execution-access. The inavailablity of the second value is not
a big handicap, though it could have been used to determine if the
platform supported disable-execution-access.

Non-PAPR platforms do not define this property in the device tree yet.
Fortunately power8 is the only released Non-PAPR platform that is
supported. Here, we hardcode the number of supported pkey to 32, by
consulting the PowerISA3.0

This patch calculates the number of keys supported by the platform.
Also it determines the platform support for read/write/execution
access support for pkeys.

Signed-off-by: Ram Pai <linuxram@us.ibm.com>
[mpe: Use a PVR check instead of CPU_FTR for execute. Restrict to
 Power7/8/9 for now until older CPUs are tested.]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2018-01-21 01:06:10 +11:00
Thiago Jung Bauermann c5cc1f4df6 powerpc/ptrace: Add memory protection key regset
The AMR/IAMR/UAMOR are part of the program context.
Allow it to be accessed via ptrace and through core files.

Signed-off-by: Ram Pai <linuxram@us.ibm.com>
Signed-off-by: Thiago Jung Bauermann <bauerman@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2018-01-20 22:59:06 +11:00
Ram Pai 99cd130232 powerpc: Deliver SEGV signal on pkey violation
The value of the pkey, whose protection got violated,
is made available in si_pkey field of the siginfo structure.

Signed-off-by: Ram Pai <linuxram@us.ibm.com>
Signed-off-by: Thiago Jung Bauermann <bauerman@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2018-01-20 22:59:05 +11:00
Ram Pai 087003e9ef powerpc: introduce get_mm_addr_key() helper
get_mm_addr_key() helper returns the pkey associated with
an address corresponding to a given mm_struct.

Signed-off-by: Ram Pai <linuxram@us.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2018-01-20 22:59:05 +11:00
Ram Pai e6c2a4797e powerpc: Handle exceptions caused by pkey violation
Handle Data and  Instruction exceptions caused by memory
protection-key.

The CPU will detect the key fault if the HPTE is already
programmed with the key.

However if the HPTE is not  hashed, a key fault will not
be detected by the hardware. The software will detect
pkey violation in such a case.

Signed-off-by: Ram Pai <linuxram@us.ibm.com>
Signed-off-by: Thiago Jung Bauermann <bauerman@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2018-01-20 22:59:04 +11:00
Ram Pai 1137573acf powerpc: implementation for arch_vma_access_permitted()
This patch provides the implementation for
arch_vma_access_permitted(). Returns true if the
requested access is allowed by pkey associated with the
vma.

Signed-off-by: Ram Pai <linuxram@us.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2018-01-20 22:59:04 +11:00
Ram Pai bca7aacfe8 powerpc: check key protection for user page access
Make sure that the kernel does not access user pages without
checking their key-protection.

Signed-off-by: Ram Pai <linuxram@us.ibm.com>
[mpe: Integrate with upstream version of pte_access_permitted()]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2018-01-20 22:59:04 +11:00
Ram Pai f2407ef3ba powerpc: helper to validate key-access permissions of a pte
helper function that checks if the read/write/execute is allowed
on the pte.

Signed-off-by: Ram Pai <linuxram@us.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2018-01-20 22:59:03 +11:00
Ram Pai a6590ca55f powerpc: Program HPTE key protection bits
Map the PTE protection key bits to the HPTE key protection bits,
while creating HPTE  entries.

Acked-by: Balbir Singh <bsingharora@gmail.com>
Signed-off-by: Ram Pai <linuxram@us.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2018-01-20 22:59:03 +11:00
Ram Pai eb95d016ce powerpc: map vma key-protection bits to pte key bits.
Map  the  key  protection  bits of the vma to the pkey bits in
the PTE.

The PTE  bits used  for pkey  are  3,4,5,6  and 57. The  first
four bits are the same four bits that were freed up  initially
in this patch series. remember? :-) Without those four bits
this patch wouldn't be possible.

BUT, on 4k kernel, bit 3, and 4 could not be freed up. remember?
Hence we have to be satisfied with 5, 6 and 7.

Signed-off-by: Ram Pai <linuxram@us.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2018-01-20 22:59:02 +11:00
Ram Pai 87bbabbed8 powerpc: implementation for arch_override_mprotect_pkey()
arch independent code calls arch_override_mprotect_pkey()
to return a pkey that best matches the requested protection.

This patch provides the implementation.

Signed-off-by: Ram Pai <linuxram@us.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2018-01-20 22:59:02 +11:00
Ram Pai 013a91b39c powerpc: ability to associate pkey to a vma
arch-independent code expects the arch to  map
a  pkey  into the vma's protection bit setting.
The patch provides that ability.

Signed-off-by: Ram Pai <linuxram@us.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2018-01-20 22:59:01 +11:00
Ram Pai 5586cf61e1 powerpc: introduce execute-only pkey
This patch provides the implementation of execute-only pkey.
The architecture-independent layer expects the arch-dependent
layer, to support the ability to create and enable a special
key which has execute-only permission.

Acked-by: Balbir Singh <bsingharora@gmail.com>
Signed-off-by: Ram Pai <linuxram@us.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2018-01-20 22:59:01 +11:00
Ram Pai 06bb53b338 powerpc: store and restore the pkey state across context switches
Store and restore the AMR, IAMR and UAMOR register state of the task
before scheduling out and after scheduling in, respectively.

Signed-off-by: Ram Pai <linuxram@us.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2018-01-20 22:59:00 +11:00
Ram Pai dcf872956d powerpc: ability to create execute-disabled pkeys
powerpc has hardware support to disable execute on a pkey.
This patch enables the ability to create execute-disabled
keys.

Signed-off-by: Ram Pai <linuxram@us.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2018-01-20 22:59:00 +11:00
Ram Pai 2ddc53f3a7 powerpc: implementation for arch_set_user_pkey_access()
This patch provides the detailed implementation for
a user to allocate a key and enable it in the hardware.

It provides the plumbing, but it cannot be used till
the system call is implemented. The next patch  will
do so.

Reviewed-by: Thiago Jung Bauermann <bauerman@linux.vnet.ibm.com>
Signed-off-by: Ram Pai <linuxram@us.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2018-01-20 22:58:59 +11:00
Ram Pai 0685f217af powerpc: cleanup AMR, IAMR when a key is allocated or freed
Cleanup the bits corresponding to a key in the AMR, and IAMR
register, when the key is newly allocated/activated or is freed.
We dont want some residual bits cause the hardware enforce
unintended behavior when the key is activated or freed.

Reviewed-by: Thiago Jung Bauermann <bauerman@linux.vnet.ibm.com>
Signed-off-by: Ram Pai <linuxram@us.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2018-01-20 22:58:59 +11:00
Ram Pai 4d70b698f9 powerpc: helper functions to initialize AMR, IAMR and UAMOR registers
Introduce  helper functions that can initialize the bits in the AMR,
IAMR and UAMOR register; the bits that correspond to the given pkey.

Reviewed-by: Thiago Jung Bauermann <bauerman@linux.vnet.ibm.com>
Signed-off-by: Ram Pai <linuxram@us.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2018-01-20 22:58:58 +11:00
Ram Pai 1b4037dead powerpc: helper function to read, write AMR, IAMR, UAMOR registers
Implements helper functions to read and write the key related
registers; AMR, IAMR, UAMOR.

AMR register tracks the read,write permission of a key
IAMR register tracks the execute permission of a key
UAMOR register enables and disables a key

Acked-by: Balbir Singh <bsingharora@gmail.com>
Reviewed-by: Thiago Jung Bauermann <bauerman@linux.vnet.ibm.com>
Signed-off-by: Ram Pai <linuxram@us.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2018-01-20 22:58:58 +11:00
Ram Pai 4fb158f65a powerpc: track allocation status of all pkeys
Total 32 keys are available on power7 and above. However
pkey 0,1 are reserved. So effectively we  have  30 pkeys.

On 4K kernels, we do not  have  5  bits  in  the  PTE to
represent  all the keys; we only have 3bits. Two of those
keys are reserved; pkey 0 and pkey 1. So effectively  we
have 6 pkeys.

This patch keeps track of reserved keys, allocated  keys
and keys that are currently free.

Also it  adds  skeletal  functions  and macros, that the
architecture-independent code expects to be available.

Reviewed-by: Thiago Jung Bauermann <bauerman@linux.vnet.ibm.com>
Signed-off-by: Ram Pai <linuxram@us.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2018-01-20 22:58:35 +11:00
Ram Pai 92e3da3cf1 powerpc: initial pkey plumbing
Basic  plumbing  to   initialize  the   pkey  system.
Nothing is enabled yet. A later patch will enable it
once all the infrastructure is in place.

Signed-off-by: Ram Pai <linuxram@us.ibm.com>
[mpe: Rework copyrights to use SPDX tags]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2018-01-20 21:45:03 +11:00
Christophe Lombard b1db551324 cxl: Add support for ASB_Notify on POWER9
The POWER9 core supports a new feature: ASB_Notify which requires the
support of the Special Purpose Register: TIDR.

The ASB_Notify command, generated by the AFU, will attempt to
wake-up the host thread identified by the particular LPID:PID:TID.

This patch assign a unique TIDR (thread id) for the current thread which
will be used in the process element entry.

Signed-off-by: Christophe Lombard <clombard@linux.vnet.ibm.com>
Reviewed-by: Philippe Bergheaud <felix@linux.vnet.ibm.com>
Acked-by: Frederic Barrat <fbarrat@linux.vnet.ibm.com>
Reviewed-by: Vaibhav Jain <vaibhav@linux.vnet.ibm.com>
Acked-by: Andrew Donnellan <andrew.donnellan@au1.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2018-01-19 23:19:37 +11:00