| Age | Commit message (Collapse) | Author | Files | Lines |
|---|
|
Add NULL test on call to kzalloc.
The semantic match that finds this problem is as follows:
(http://coccinelle.lip6.fr/)
// <smpl>
@@
expression x;
identifier fld;
@@
* x = kzalloc(...);
... when != x == NULL
x->fld
// </smpl>
Signed-off-by: Julia Lawall <[email protected]>
Signed-off-by: Heiko Carstens <[email protected]>
Signed-off-by: Martin Schwidefsky <[email protected]>
|
|
Adding tracepoints to inline functions adds tracepoint invocation code
for each instance where the function is inlined. The resulting increase
in kernel code size can have negative impact:
- More cache misses in instruction cache
- Reduced amount of DMA-capable memory
Therefore change all functions implementing I/O instructions from inline
to normal functions.
Bloat-o-meter summary after change (using performance_defconfig):
add/remove: 24/2 grow/shrink: 4/39 up/down: 2205/-4858 (-2653)
Signed-off-by: Peter Oberparleiter <[email protected]>
Acked-by: Cornelia Huck <[email protected]>
Signed-off-by: Martin Schwidefsky <[email protected]>
|
|
Add tracepoints to interrupt handler and core inline assemblies used by
the s390 common I/O layer. These tracepoints can be used to monitor and
validate hardware and hypervisor requests and responses.
Signed-off-by: Peter Oberparleiter <[email protected]>
Reviewed-by: Sebastian Ott <[email protected]>
Reviewed-by: Cornelia Huck <[email protected]>
Signed-off-by: Martin Schwidefsky <[email protected]>
|
|
Replace the current semi-arbitrary distribution of inline assemblies:
- Inline assemblies used by CIO go into ioasm.h
- Data definitions used by inline assemblies go into cio.h
Beyond cleaning up the current structure this is also required for
use of tracepoints in inline assemblies introduced by a follow-on
patch.
Signed-off-by: Peter Oberparleiter <[email protected]>
Acked-by: Sebastian Ott <[email protected]>
Acked-by: Cornelia Huck <[email protected]>
Signed-off-by: Martin Schwidefsky <[email protected]>
|
|
The numeric representation of the xsch instruction was incorrectly
specified, resulting in reserved fields of the instruction opcode
potentially being set to a non-zero value. While this doesn't currently
cause any problem, a future architecture might make use of these fields
so that the current specification could result in an exception or
unwanted side-effects.
Fix this by using the xsch instruction code for which support in
binutils was added in 2003.
Signed-off-by: Peter Oberparleiter <[email protected]>
Signed-off-by: Martin Schwidefsky <[email protected]>
|
|
There is no longer a need to maintain two versions of the same inline
assembly - one with exception handling, and one without - so get rid of
the duplicates and adjust names accordingly. This applies to stsch_err
and msch_err which are now renamed to stsch and msch respectively,
while the original msch function is removed.
Signed-off-by: Peter Oberparleiter <[email protected]>
Acked-by: Cornelia Huck <[email protected]>
Signed-off-by: Martin Schwidefsky <[email protected]>
|
|
Over time some machine flags got unused (e.g. MACHINE_FLAG_MVPG)
or are available on all 64bit systems (MACHINE_FLAG_CSP,
MACHINE_FLAG_IEEE) - let's remove them.
Reorder the other ones to match the order of the MACHINE_HAS_*
macros and renumber all bits to avoid holes.
Also fix the comment about where the flags are detected.
Signed-off-by: Christian Borntraeger <[email protected]>
Signed-off-by: Martin Schwidefsky <[email protected]>
|
|
This is supposed to make debugging easier: if within a dump we can see
that an external call or emergency signal IPI is pending but all cpus
are idle, we have no idea for how long the interrupt is outstanding.
Therefore save a timestamp into the per cpu pcpu array of the target
cpu whenever such an IPI is sent.
Signed-off-by: Heiko Carstens <[email protected]>
Signed-off-by: Martin Schwidefsky <[email protected]>
|
|
max_mnest and rc are never used.
Signed-off-by: Christian Borntraeger <[email protected]>
Signed-off-by: Martin Schwidefsky <[email protected]>
|
|
findseg_scode is assigned, but never used.
Signed-off-by: Christian Borntraeger <[email protected]>
Signed-off-by: Martin Schwidefsky <[email protected]>
|
|
address is assigned but never used.
Signed-off-by: Christian Borntraeger <[email protected]>
Signed-off-by: Martin Schwidefsky <[email protected]>
|
|
location is assigned but never used.
Signed-off-by: Christian Borntraeger <[email protected]>
Signed-off-by: Martin Schwidefsky <[email protected]>
|
|
head.S on s390 contains some sanity checks if the kernel will run on a
machine or if the machine is too old, e.g. if the kernel contains
instructions not available on the machine. If so, it will emit an error
message to the console before it stops execution.
Therefore head.S contains only instructions which are availanble with the
earliest machine generation (z900). In order to make sure we don't
accidently add instructions which are not available on z900, always compile
with -march=z900. This makes sure compilation will fail if wrong
instructions are used.
Signed-off-by: Heiko Carstens <[email protected]>
Signed-off-by: Martin Schwidefsky <[email protected]>
|
|
It is already possible to remove CFLAGS with the CFLAGS_REMOVE option
that was introduced with commit 656ee82cc855 ("kbuild: create new
CFLAGS_REMOVE_(basename).o option"). However it is not possible to
remove AFLAGS for assembler files.
So this patch just adds the AFLAGS_REMOVE option which works the same
like CFLAGS_REMOVE.
Signed-off-by: Heiko Carstens <[email protected]>
Acked-by: Michal Marek <[email protected]>
Signed-off-by: Martin Schwidefsky <[email protected]>
|
|
If configured for z13 assume the kernel makes use of the instructions
that are part of the load-and-zero-rightmost-byte facility and
load/store-on-condition facility 2.
Signed-off-by: Heiko Carstens <[email protected]>
Signed-off-by: Martin Schwidefsky <[email protected]>
|
|
test_facility() can be optimized for bits which must be set anyway,
due to the check in head.S. This removes a couple of superfluous
runtime checks.
Signed-off-by: Heiko Carstens <[email protected]>
Signed-off-by: Martin Schwidefsky <[email protected]>
|
|
The facility lists contain a lot of bits which are not necessary to
run the kernel. Therefore remove them and keep only those bits which
are required for the kernel.
Signed-off-by: Heiko Carstens <[email protected]>
Signed-off-by: Martin Schwidefsky <[email protected]>
|
|
Change head.S to make use of the generated facility list.
Signed-off-by: Heiko Carstens <[email protected]>
Signed-off-by: Martin Schwidefsky <[email protected]>
|
|
Modifying the architecture level set facility lists was always very
error prone. Given the numbering of the facility bits within the
Principles of Operation, where the most significant bit number is 0,
it happened a lot of times that wrong bits were set or cleared.
Therefore this patch adds a tool "gen_facilities" which generates
include/generated/facilites.h. The definition of the bits to be set
is contained within arch/s390/include/asm/facilities_src.h and can be
easily extended to e.g. also generate such lists for the KVM module.
The generated file looks like this:
#define FACILITIES_ALS _AC(0xc1006450f0040000,UL)
#define FACILITIES_ALS_DWORDS 1
The facility bits defined in this patch match 1:1 to the current masks
that can be found in head.S.
That is if the tool gets executed with -march=z990 then the generated
masks will equal the masks in head.S for CONFIG_MARCH_Z990.
Signed-off-by: Heiko Carstens <[email protected]>
Signed-off-by: Martin Schwidefsky <[email protected]>
|
|
head.s contains an stfle instruction which stores it result at the
storage location that is assigned to the stfl instruction.
This is currently no problem, since we only care about one double
word. However if the number of double words in the ALS bitfield grows
the current code is not very stable.
E.g. before issuing the stfle command the memory to which it stores
must be cleared, since the instruction may or may not clear memory
contents where no bits are set.
In order to simplify the code a bit always use the storage location
that we reserved for the stfle result.
Signed-off-by: Heiko Carstens <[email protected]>
Signed-off-by: Martin Schwidefsky <[email protected]>
|
|
Now that 31 bit support is gone, the assembler always knows about the
stfl instruction. Therefore lets use a readable mnemonic. Also remove
the not needed extable entry for the inline assembly and fix the
output constraint.
Signed-off-by: Heiko Carstens <[email protected]>
Reviewed-by: Christian Borntraeger <[email protected]>
Signed-off-by: Martin Schwidefsky <[email protected]>
|
|
It does not make sense to try to relinquish the time slice with diag 0x9c
to a CPU in a state that does not allow to schedule the CPU. The scenario
where this can happen is a CPU waiting in udelay/mdelay while holding a
spin-lock.
Add a CIF bit to tag a CPU in enabled wait and use it to detect that the
yield of a CPU will not be successful and skip the diagnose call.
Reviewed-by: Heiko Carstens <[email protected]>
Signed-off-by: Martin Schwidefsky <[email protected]>
|
|
Provide a user space interface and an enhancement to the sclp device driver
which allows to send an 'Open for Business' event from the operating system
to the Support Element. The 'Open for Business' event is used to signal the
Support Element that the operating system (or an application running on top
of it) is up and running.
Signed-off-by: Jochen Schweflinghaus <[email protected]>
Signed-off-by: Heiko Carstens <[email protected]>
Signed-off-by: Martin Schwidefsky <[email protected]>
|
|
is_32bit_task() used to be helpful when we still had CONFIG_32BIT.
Since that is gone, it is nowadays identical to is_compat_task().
So remove it.
Signed-off-by: Heiko Carstens <[email protected]>
Signed-off-by: Martin Schwidefsky <[email protected]>
|
|
Signed-off-by: Michael Holzheu <[email protected]>
Signed-off-by: Martin Schwidefsky <[email protected]>
|
|
When running under qemu with the default configuration (-nographic),
there is only a VT220 SCLP console, no line-mode SCLP console. Add
VT220 support to the early SCLP console so the user has a chance to
see critical error messages during early boot.
None of the existing users of _sclp_print_early() check the return
code. Instead of trying to come up with return code semantics when
printing to multiple consoles (any or all of which may fail), we just
drop the return code entirely.
Tested on z/VM (line mode console) and LPAR (VT220 and line mode
console). Tested on qemu/KVM with VT220 console and / or line mode
console.
Signed-off-by: Sascha Silbe <[email protected]>
Reviewed-by: Peter Oberparleiter <[email protected]>
Signed-off-by: Martin Schwidefsky <[email protected]>
|
|
Since commit b006f19b055f ("lib/vsprintf.c: handle invalid format
specifiers more robustly") I get errors like
[...]
Krnl Code: 00000000004e2410: c00400000000 brcl 0,4e2410
Please remove unsupported %r in format string
[ 8.179483] ------------[ cut here ]------------
[ 8.179484] WARNING: at lib/vsprintf.c:1781
Turns out that our disassembler relied on %r not being used as format
string. Let's do the proper escaping of our decode buffers.
Signed-off-by: Christian Borntraeger <[email protected]>
Signed-off-by: Martin Schwidefsky <[email protected]>
|
|
Since commit c05ffc4f2b20 ("[S390] sclp: sysfs interface for
SCLP cpi"), which was made 2008 the user can specify a system
and sysplex name through the /sys/firmware/cpi interface. In
addition to sysplex and system name, the user can also override
the system type and system version.
Because the syfs interface is easier to use and allows the
settings to be updated, the sclp_cpi module becomes obsolete
and can be removed.
Signed-off-by: Hendrik Brueckner <[email protected]>
Acked-by: Christian Borntraeger <[email protected]>
Acked-by: Heiko Carstens <[email protected]>
Signed-off-by: Martin Schwidefsky <[email protected]>
|
|
The debug_unregister() function performs also input parameter validation.
Thus the test around the calls is not needed.
This issue was detected by using the Coccinelle software.
Signed-off-by: Markus Elfring <[email protected]>
Signed-off-by: Heiko Carstens <[email protected]>
Signed-off-by: Martin Schwidefsky <[email protected]>
|
|
DMA addresses returned from map_page() are calculated by using an iommu
bitmap plus a start_dma offset. The size of this bitmap is based on the main
memory size. If we have more than (4 TB - start_dma) main memory, the DMA
address calculation will also produce addresses > 4 TB. Such addresses
cannot be inserted in the 3-level DMA page table, instead the entries
modulo 4 TB will be overwritten.
Fix this by restricting the iommu bitmap size to (4 TB - start_dma).
Also set zdev->end_dma to the actual end address of the usable
range, instead of the theoretical maximum as reported by the hardware,
which fixes a sanity check in dma_map() and also the IOMMU API domain
geometry aperture calculation.
Signed-off-by: Gerald Schaefer <[email protected]>
Reviewed-by: Sebastian Ott <[email protected]>
Signed-off-by: Martin Schwidefsky <[email protected]>
|
|
Let's annotate it correctly, so we directly get a warning if
we ever were to use it in atomic/preempt_disable/spinlock environment.
Acked-by: Heiko Carstens <[email protected]>
Signed-off-by: David Hildenbrand <[email protected]>
Signed-off-by: Martin Schwidefsky <[email protected]>
|
|
The spinlock implementation calls the diagnose 0x9c / 0x44 immediately
if the SIGP sense running reported the target CPU as not running.
The diagnose 0x9c is a hint to the hypervisor to schedule the target
CPU in preference to the source CPU that issued the diagnose. It can
happen that on return from the diagnose the target CPU has not been
scheduled yet, e.g. if the target logical CPU is on another physical
CPU and the hypervisor did not want to migrate the logical CPU.
Avoid the immediate repeat of the diagnose instruction, instead do
the retry loop before the next invocation of diagnose 0x9c.
Reviewed-by: Heiko Carstens <[email protected]>
Signed-off-by: Martin Schwidefsky <[email protected]>
|
|
Introduce save_area_alloc(), save_area_boot_cpu(), save_area_add_regs()
and save_area_add_vxrs to deal with storing the CPU state in case of a
system dump. Remove struct save_area and save_area_ext, and create a new
struct save_area as a local definition to arch/s390/kernel/crash_dump.c.
Copy each individual field from the hardware status area to the save area,
storing the minimum of required data.
Signed-off-by: Martin Schwidefsky <[email protected]>
|
|
To collect the CPU registers of the crashed system allocated a single
page with memblock_alloc_base and use it as a copy buffer. Replace the
stop-and-store-status sigp with a store-status-at-address sigp in
smp_save_dump_cpus() and smp_store_status(). In both cases the target
CPU is already stopped and store-status-at-address avoids the detour
via the absolute zero page.
For kexec simplify s390_reset_system and call store_status() before
the prefix register of the boot CPU has been set to zero. Use STPX
to store the prefix register and remove dump_prefix_page.
Acked-by: Michael Holzheu <[email protected]>
Signed-off-by: Martin Schwidefsky <[email protected]>
|
|
Replace the SAVE_AREA_BASE offset calculations in reipl.S with the
assembler constant for the location of each register status area.
Use __LC_FPREGS_SAVE_AREA instead of SAVE_AREA_BASE in the three
remaining code locations and remove the definition of SAVE_AREA_BASE.
Acked-by: Michael Holzheu <[email protected]>
Signed-off-by: Martin Schwidefsky <[email protected]>
|
|
Replace the offsets based on the struct area_area with the offset
constants from asm-offsets.c based on the struct _lowcore.
Signed-off-by: Martin Schwidefsky <[email protected]>
|
|
Replace the three part copy logic int memcpy_hsa with a single loop
around sclp_sdias_copy with appropriate offset and size calculations,
and inline memcpy_hsa into memcpy_hsa_user and memcpy_hsa_kernel.
Acked-by: Michael Holzheu <[email protected]>
Signed-off-by: Martin Schwidefsky <[email protected]>
|
|
Introduce two copy functions for the memory of the dumped system,
copy_oldmem_kernel() to copy to the virtual kernel address space
and copy_oldmem_user() to copy to user space.
Acked-by: Michael Holzheu <[email protected]>
Signed-off-by: Martin Schwidefsky <[email protected]>
|
|
The s390 architecture can store the CPU registers of the crashed system
after the kdump kernel has been started and this is the preferred way.
Remove the remaining code fragments that deal with storing CPU registers
while the crashed system is still active.
Acked-by: Michael Holzheu <[email protected]>
Signed-off-by: Martin Schwidefsky <[email protected]>
|
|
New versions of the SCSI dumper use the /dev/vmcore interface instead
of zcore mem. Remove the outdated interface.
Acked-by: Michael Holzheu <[email protected]>
Signed-off-by: Martin Schwidefsky <[email protected]>
|
|
The /sys/kernel/debug/zcore/mem interface delivers the memory of the
old system with the CPU registers stored to the assigned locations in
each prefix page.
For the vector registers the prefix page of each CPU has an address of
a 1024 byte save area at 0x11b0. But the /sys/kernel/debug/zcore/mem
interface fails copy the vector registers saved at boot of the zfcpdump
kernel into the dump image.
Copy the saved vector registers of a CPU to the outout buffer if the
memory area that is read via /sys/kernel/debug/zcore/mem intersects
with the vector register save area of this CPU.
Acked-by: Michael Holzheu <[email protected]>
Signed-off-by: Martin Schwidefsky <[email protected]>
|
|
The extended save area for the boot CPU has been allocated by
smp_save_dump_cpus() with memblock_alloc() and may not be freed
with kfree().
Signed-off-by: Martin Schwidefsky <[email protected]>
|
|
When the AP queue depth of requests was reached additional requests
have been ignored. These request are stuck in the request queue.
The AP queue handling now push the next waiting request into the
queue after fetching a previous serviced and finished reply.
Signed-off-by: Ingo Tuchscherer <[email protected]>
Acked-by: Martin Schwidefsky <[email protected]>
Acked-by: Harald Freudenberger <[email protected]>
Signed-off-by: Martin Schwidefsky <[email protected]>
|
|
git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
Pull vfs fixes from Al Viro:
"A couple of fixes for sendfile lockups caught by Dmitry + a fix for
ancient sysvfs symlink breakage"
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
vfs: Avoid softlockups with sendfile(2)
vfs: Make sendfile(2) killable even better
fix sysvfs symlinks
|
|
Pull more block layer fixes from Jens Axboe:
"I wasn't going to send off a new pull before next week, but the blk
flush fix from Jan from the other day introduced a regression. It's
rare enough not to have hit during testing, since it requires both a
device that rejects the first flush, and bad timing while it does
that. But since someone did hit it, let's get the revert into 4.4-rc3
so we don't have a released rc with that known issue.
Apart from that revert, three other fixes:
- From Christoph, a fix for a missing unmap in NVMe request
preparation.
- An NVMe fix from Nishanth that fixes data corruption on powerpc.
- Also from Christoph, fix a list_del() attempt on blk-mq that didn't
have a matching list_add() at timer start"
* 'for-linus' of git://git.kernel.dk/linux-block:
Revert "blk-flush: Queue through IO scheduler when flush not required"
block: fix blk_abort_request for blk-mq drivers
nvme: add missing unmaps in nvme_queue_rq
NVMe: default to 4k device page size
|
|
This reverts commit 1b2ff19e6a957b1ef0f365ad331b608af80e932e.
Jan writes:
--
Thanks for report! After some investigation I found out we allocate
elevator specific data in __get_request() only for non-flush requests. And
this is actually required since the flush machinery uses the space in
struct request for something else. Doh. So my patch is just wrong and not
easy to fix since at the time __get_request() is called we are not sure
whether the flush machinery will be used in the end. Jens, please revert
1b2ff19e6a957b1ef0f365ad331b608af80e932e. Thanks!
I'm somewhat surprised that you can reliably hit the race where flushing
gets disabled for the device just while the request is in flight. But I
guess during boot it makes some sense.
--
So let's just revert it, we can fix the queue run manually after the
fact. This race is rare enough that it didn't trigger in testing, it
requires the specific disable-while-in-flight scenario to trigger.
|
|
Pull KVM fixes from Paolo Bonzini:
"Bug fixes for all architectures. Nothing really stands out"
* tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm: (21 commits)
KVM: nVMX: remove incorrect vpid check in nested invvpid emulation
arm64: kvm: report original PAR_EL1 upon panic
arm64: kvm: avoid %p in __kvm_hyp_panic
KVM: arm/arm64: vgic: Trust the LR state for HW IRQs
KVM: arm/arm64: arch_timer: Preserve physical dist. active state on LR.active
KVM: arm/arm64: Fix preemptible timer active state crazyness
arm64: KVM: Add workaround for Cortex-A57 erratum 834220
arm64: KVM: Fix AArch32 to AArch64 register mapping
ARM/arm64: KVM: test properly for a PTE's uncachedness
KVM: s390: fix wrong lookup of VCPUs by array index
KVM: s390: avoid memory overwrites on emergency signal injection
KVM: Provide function for VCPU lookup by id
KVM: s390: fix pfmf intercept handler
KVM: s390: enable SIMD only when no VCPUs were created
KVM: x86: request interrupt window when IRQ chip is split
KVM: x86: set KVM_REQ_EVENT on local interrupt request from user space
KVM: x86: split kvm_vcpu_ready_for_interrupt_injection out of dm_request_for_irq_injection
KVM: x86: fix interrupt window handling in split IRQ chip case
MIPS: KVM: Uninit VCPU in vcpu_create error path
MIPS: KVM: Fix CACHE immediate offset sign extension
...
|
|
This patch removes the vpid check when emulating nested invvpid
instruction of type all-contexts invalidation. The existing code is
incorrect because:
(1) According to Intel SDM Vol 3, Section "INVVPID - Invalidate
Translations Based on VPID", invvpid instruction does not check
vpid in the invvpid descriptor when its type is all-contexts
invalidation.
(2) According to the same document, invvpid of type all-contexts
invalidation does not require there is an active VMCS, so/and
get_vmcs12() in the existing code may result in a NULL-pointer
dereference. In practice, it can crash both KVM itself and L1
hypervisors that use invvpid (e.g. Xen).
Signed-off-by: Haozhong Zhang <[email protected]>
Signed-off-by: Paolo Bonzini <[email protected]>
|
|
We only added the request to the request list for the !blk-mq case,
so we should only delete it in that case as well.
Signed-off-by: Christoph Hellwig <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
|
|
When we fail various metadata related operations in nvme_queue_rq we
need to unmap the data SGL.
Cc: [email protected]
Signed-off-by: Christoph Hellwig <[email protected]>
Signed-off-by: Keith Busch <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
|