Add regs_get_argument() which returns N th argument of the
function call.
Note that this chooses most probably assignment, in some case
it can be incorrect (e.g. passing data structure or floating
point etc.)
This is expected to be called from kprobes or ftrace with regs
where the top of stack is the return address.
Link: http://lkml.kernel.org/r/152465885737.26224.2822487520472783854.stgit@devbox
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Add array type support for probe events.
This allows user to get arraied types from memory address.
The array type syntax is
TYPE[N]
Where TYPE is one of types (u8/16/32/64,s8/16/32/64,
x8/16/32/64, symbol, string) and N is a fixed value less
than 64.
The string array type is a bit different from other types. For
other base types, <base-type>[1] is equal to <base-type>
(e.g. +0(%di):x32[1] is same as +0(%di):x32.) But string[1] is not
equal to string. The string type itself represents "char array",
but string array type represents "char * array". So, for example,
+0(%di):string[1] is equal to +0(+0(%di)):string.
Link: http://lkml.kernel.org/r/152465891533.26224.6150658225601339931.stgit@devbox
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Add "symbol" type to probeevent, which is an alias of u32 or u64
(depends on BITS_PER_LONG). This shows the result value in
symbol+offset style. This type is only available with kprobe
events.
Link: http://lkml.kernel.org/r/152465882860.26224.14779072294412467338.stgit@devbox
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Unify the fetch_insn bottom process (from stage 2: dereference
indirect data) from kprobe and uprobe events, since those are
mostly same.
Link: http://lkml.kernel.org/r/152465879965.26224.8547240824606804815.stgit@devbox
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Cleanup string fetching routine so that returns the consumed
bytes of dynamic area and store the string information as
data_loc format instead of data_rloc.
This simplifies the fetcharg loop.
Link: http://lkml.kernel.org/r/152465874163.26224.12125143907501289031.stgit@devbox
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Unify {k,u}probe_fetch_type_table to probe_fetch_type_table
because the main difference of those type tables (fetcharg
methods) are gone. Now we can consolidate it.
Link: http://lkml.kernel.org/r/152465871274.26224.13999436317830479698.stgit@devbox
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Replace {k,u}probe event argument fetching framework with switch-case based.
Currently that is implemented with structures, macros and chain of
function-pointers, which is more complicated than necessary and may get a
performance penalty by retpoline.
This simplify that with an array of "fetch_insn" (opcode and oprands), and
make process_fetch_insn() just interprets it. No function pointers are used.
Link: http://lkml.kernel.org/r/152465868340.26224.2551120475197839464.stgit@devbox
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Remove unneeded NOKPROBE_SYMBOL from print functions since
the print functions are only used when printing out the
trace data, and not from kprobe handler.
Link: http://lkml.kernel.org/r/152465865422.26224.10111548170594014954.stgit@devbox
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Cleanup the print-argument function to decouple it into
print-name and print-value, so that it can support more
flexible expression, like array type.
Link: http://lkml.kernel.org/r/152465859635.26224.13452846788717102315.stgit@devbox
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
This patch enables uprobes with reference counter in fd-based uprobe.
Highest 32 bits of perf_event_attr.config is used to stored offset
of the reference count (semaphore).
Format information in /sys/bus/event_source/devices/uprobe/format/ is
updated to reflect this new feature.
Link: http://lkml.kernel.org/r/20181002053636.1896903-1-songliubraving@fb.com
Cc: Oleg Nesterov <oleg@redhat.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-and-tested-by: Ravi Bangoria <ravi.bangoria@linux.ibm.com>
Signed-off-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
We assume to have only one reference counter for one uprobe.
Don't allow user to add multiple trace_uprobe entries having
same inode+offset but different reference counter.
Ex,
# echo "p:sdt_tick/loop2 /home/ravi/tick:0x6e4(0x10036)" > uprobe_events
# echo "p:sdt_tick/loop2_1 /home/ravi/tick:0x6e4(0xfffff)" >> uprobe_events
bash: echo: write error: Invalid argument
# dmesg
trace_kprobe: Reference counter offset mismatch.
There is one exception though:
When user is trying to replace the old entry with the new
one, we allow this if the new entry does not conflict with
any other existing entries.
Link: http://lkml.kernel.org/r/20180820044250.11659-4-ravi.bangoria@linux.ibm.com
Acked-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Reviewed-by: Song Liu <songliubraving@fb.com>
Reviewed-by: Oleg Nesterov <oleg@redhat.com>
Tested-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Ravi Bangoria <ravi.bangoria@linux.ibm.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
We assume to have only one reference counter for one uprobe.
Don't allow user to register multiple uprobes having same
inode+offset but different reference counter.
Link: http://lkml.kernel.org/r/20180820044250.11659-3-ravi.bangoria@linux.ibm.com
Acked-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Reviewed-by: Oleg Nesterov <oleg@redhat.com>
Reviewed-by: Song Liu <songliubraving@fb.com>
Tested-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Ravi Bangoria <ravi.bangoria@linux.ibm.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Userspace Statically Defined Tracepoints[1] are dtrace style markers
inside userspace applications. Applications like PostgreSQL, MySQL,
Pthread, Perl, Python, Java, Ruby, Node.js, libvirt, QEMU, glib etc
have these markers embedded in them. These markers are added by developer
at important places in the code. Each marker source expands to a single
nop instruction in the compiled code but there may be additional
overhead for computing the marker arguments which expands to couple of
instructions. In case the overhead is more, execution of it can be
omitted by runtime if() condition when no one is tracing on the marker:
if (reference_counter > 0) {
Execute marker instructions;
}
Default value of reference counter is 0. Tracer has to increment the
reference counter before tracing on a marker and decrement it when
done with the tracing.
Implement the reference counter logic in core uprobe. User will be
able to use it from trace_uprobe as well as from kernel module. New
trace_uprobe definition with reference counter will now be:
<path>:<offset>[(ref_ctr_offset)]
where ref_ctr_offset is an optional field. For kernel module, new
variant of uprobe_register() has been introduced:
uprobe_register_refctr(inode, offset, ref_ctr_offset, consumer)
No new variant for uprobe_unregister() because it's assumed to have
only one reference counter for one uprobe.
[1] https://sourceware.org/systemtap/wiki/UserSpaceProbeImplementation
Note: 'reference counter' is called as 'semaphore' in original Dtrace
(or Systemtap, bcc and even in ELF) documentation and code. But the
term 'semaphore' is misleading in this context. This is just a counter
used to hold number of tracers tracing on a marker. This is not really
used for any synchronization. So we are calling it a 'reference counter'
in kernel / perf code.
Link: http://lkml.kernel.org/r/20180820044250.11659-2-ravi.bangoria@linux.ibm.com
Reviewed-by: Masami Hiramatsu <mhiramat@kernel.org>
[Only trace_uprobe.c]
Reviewed-by: Oleg Nesterov <oleg@redhat.com>
Reviewed-by: Song Liu <songliubraving@fb.com>
Tested-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Ravi Bangoria <ravi.bangoria@linux.ibm.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
By utilizing a temporary variable, we can avoid adding another call to
strchr(). Instead, save the first call to a temp variable, and then use that
variable as the reference to set the event variable.
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
- Fix OMAP Device Tree compatible strings to match DT
-----BEGIN PGP SIGNATURE-----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=5veh
-----END PGP SIGNATURE-----
Merge tag 'mfd-fixes-4.19' of git://git.kernel.org/pub/scm/linux/kernel/git/lee/mfd
Lee writes:
"MFD fixes for v4.19
- Fix Dialog DA9063 regulator constraints issue causing failure in
probe
- Fix OMAP Device Tree compatible strings to match DT"
* tag 'mfd-fixes-4.19' of git://git.kernel.org/pub/scm/linux/kernel/git/lee/mfd:
mfd: omap-usb-host: Fix dts probe of children
mfd: da9063: Fix DT probing with constraints
-----BEGIN PGP SIGNATURE-----
iHUEABYIAB0WIQRTLbB6QfY48x44uB6AXGG7T9hjvgUCW6dGhgAKCRCAXGG7T9hj
vs1UAPwPSDmelfUus+P5ndRQZdK/iQWuRgQUe9Gd3RUVTfcQ7AEAljcN4/dSj7SB
hOgRlCp5WB1s5/vFF7z4jc2wtqvOPAk=
=8P9c
-----END PGP SIGNATURE-----
Merge tag 'for-linus-4.19d-rc5-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip
Juergen writes:
"xen:
Two small fixes for xen drivers."
* tag 'for-linus-4.19d-rc5-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip:
xen: issue warning message when out of grant maptrack entries
xen/x86/vpmu: Zero struct pt_regs before calling into sample handling code
-----BEGIN PGP SIGNATURE-----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=7uhx
-----END PGP SIGNATURE-----
Merge tag 'for-linus-20180922' of git://git.kernel.dk/linux-block
Jens writes:
"Just a single fix in this pull request, fixing a regression in
/proc/diskstats caused by the unification of timestamps."
* tag 'for-linus-20180922' of git://git.kernel.dk/linux-block:
block: use nanosecond resolution for iostat
Thomas writes:
"A set of fixes for x86:
- Resolve the kvmclock regression on AMD systems with memory
encryption enabled. The rework of the kvmclock memory allocation
during early boot results in encrypted storage, which is not
shareable with the hypervisor. Create a new section for this data
which is mapped unencrypted and take care that the later
allocations for shared kvmclock memory is unencrypted as well.
- Fix the build regression in the paravirt code introduced by the
recent spectre v2 updates.
- Ensure that the initial static page tables cover the fixmap space
correctly so early console always works. This worked so far by
chance, but recent modifications to the fixmap layout can -
depending on kernel configuration - move the relevant entries to a
different place which is not covered by the initial static page
tables.
- Address the regressions and issues which got introduced with the
recent extensions to the Intel Recource Director Technology code.
- Update maintainer entries to document reality"
* 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86/mm: Expand static page table for fixmap space
MAINTAINERS: Add X86 MM entry
x86/intel_rdt: Add Reinette as co-maintainer for RDT
MAINTAINERS: Add Borislav to the x86 maintainers
x86/paravirt: Fix some warning messages
x86/intel_rdt: Fix incorrect loop end condition
x86/intel_rdt: Fix exclusive mode handling of MBA resource
x86/intel_rdt: Fix incorrect loop end condition
x86/intel_rdt: Do not allow pseudo-locking of MBA resource
x86/intel_rdt: Fix unchecked MSR access
x86/intel_rdt: Fix invalid mode warning when multiple resources are managed
x86/intel_rdt: Global closid helper to support future fixes
x86/intel_rdt: Fix size reporting of MBA resource
x86/intel_rdt: Fix data type in parsing callbacks
x86/kvm: Use __bss_decrypted attribute in shared variables
x86/mm: Add .bss..decrypted section to hold shared variables
Thomas writes:
"- Provide a strerror_r wrapper so lib/bpf can be built on systems
without _GNU_SOURCE
- Unbreak the man page generator when building out of tree"
* 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
perf Documentation: Fix out-of-tree asciidoctor man page generation
tools lib bpf: Provide wrapper for strerror_r to build in !_GNU_SOURCE systems
Thomas writes:
"Make the EFI arm stub device tree loader default on to unbreak
existing EFI boot loaders which do not have DTB support."
* 'efi-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
efi/libstub/arm: default EFI_ARMSTUB_DTB_LOADER to y
Klaus Kusche reported that the I/O busy time in /proc/diskstats was not
updating properly on 4.18. This is because we started using ktime to
track elapsed time, and we convert nanoseconds to jiffies when we update
the partition counter. However, this gets rounded down, so any I/Os that
take less than a jiffy are not accounted for. Previously in this case,
the value of jiffies would sometimes increment while we were doing I/O,
so at least some I/Os were accounted for.
Let's convert the stats to use nanoseconds internally. We still report
milliseconds as before, now more accurately than ever. The value is
still truncated to 32 bits for backwards compatibility.
Fixes: 522a777566 ("block: consolidate struct request timestamp fields")
Cc: stable@vger.kernel.org
Reported-by: Klaus Kusche <klaus.kusche@computerix.info>
Signed-off-by: Omar Sandoval <osandov@fb.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
- Two fixes for the Intel pin controllers than cause
problems on laptops.
-----BEGIN PGP SIGNATURE-----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=NdkN
-----END PGP SIGNATURE-----
Merge tag 'pinctrl-v4.19-3' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-pinctrl
Linus writes:
"Pin control fixes for v4.19:
- Two fixes for the Intel pin controllers than cause
problems on laptops."
* tag 'pinctrl-v4.19-3' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-pinctrl:
pinctrl: intel: Do pin translation in other GPIO operations as well
pinctrl: cannonlake: Fix gpio base for GPP-E
I swear I would have sent it the same to Linus! The main cause for
this is that I was on vacation until two weeks ago and it took a while
to sort all the pending patches between 4.19 and 4.20, test them and
so on.
It's mostly small bugfixes and cleanups, mostly around x86 nested
virtualization. One important change, not related to nested
virtualization, is that the ability for the guest kernel to trap CPUID
instructions (in Linux that's the ARCH_SET_CPUID arch_prctl) is now
masked by default. This is because the feature is detected through an
MSR; a very bad idea that Intel seems to like more and more. Some
applications choke if the other fields of that MSR are not initialized
as on real hardware, hence we have to disable the whole MSR by default,
as was the case before Linux 4.12.
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v2.0.22 (GNU/Linux)
iQEcBAABAgAGBQJbpPo1AAoJEL/70l94x66DdxgH/is0qe6ZBtzb6Qc0W+8mHHD7
nxIkWAs2V5NsouJ750YwRQ+0Ym407+wlNt30acdBUEoXhrnA5/TvyGq999XvCL96
upWEIxpIgbvTMX/e2nLhe4wQdhsboUK4r0/B9IFgVFYrdCt5uRXjB2G4ewxcqxL/
GxxqrAKhaRsbQG9Xv0Fw5Vohh/Ls6fQDJcyuY1EBnbMpVenq2QDLI6cOAPXncyFb
uLN6ov4GNCWIPckwxejri5XhZesUOsafrmn48sApShh4T6TrisrdtSYdzl+DGza+
j5vhIEwdFO5kulZ3viuhqKJOnS2+F6wvfZ75IKT0tEKeU2bi+ifGDyGRefSF6Q0=
=YXLw
-----END PGP SIGNATURE-----
Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm
Paolo writes:
"It's mostly small bugfixes and cleanups, mostly around x86 nested
virtualization. One important change, not related to nested
virtualization, is that the ability for the guest kernel to trap
CPUID instructions (in Linux that's the ARCH_SET_CPUID arch_prctl) is
now masked by default. This is because the feature is detected
through an MSR; a very bad idea that Intel seems to like more and
more. Some applications choke if the other fields of that MSR are
not initialized as on real hardware, hence we have to disable the
whole MSR by default, as was the case before Linux 4.12."
* tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm: (23 commits)
KVM: nVMX: Fix bad cleanup on error of get/set nested state IOCTLs
kvm: selftests: Add platform_info_test
KVM: x86: Control guest reads of MSR_PLATFORM_INFO
KVM: x86: Turbo bits in MSR_PLATFORM_INFO
nVMX x86: Check VPID value on vmentry of L2 guests
nVMX x86: check posted-interrupt descriptor addresss on vmentry of L2
KVM: nVMX: Wake blocked vCPU in guest-mode if pending interrupt in virtual APICv
KVM: VMX: check nested state and CR4.VMXE against SMM
kvm: x86: make kvm_{load|put}_guest_fpu() static
x86/hyper-v: rename ipi_arg_{ex,non_ex} structures
KVM: VMX: use preemption timer to force immediate VMExit
KVM: VMX: modify preemption timer bit only when arming timer
KVM: VMX: immediately mark preemption timer expired only for zero value
KVM: SVM: Switch to bitmap_zalloc()
KVM/MMU: Fix comment in walk_shadow_page_lockless_end()
kvm: selftests: use -pthread instead of -lpthread
KVM: x86: don't reset root in kvm_mmu_setup()
kvm: mmu: Don't read PDPTEs when paging is not enabled
x86/kvm/lapic: always disable MMIO interface in x2APIC mode
KVM: s390: Make huge pages unavailable in ucontrol VMs
...
- A wrong UBIFS assertion in mount code
- Fix for a NULL pointer deref in mount code
- Revert of a bad fix for xattrs
-----BEGIN PGP SIGNATURE-----
iQJKBAABCAA0FiEEdgfidid8lnn52cLTZvlZhesYu8EFAlukuf8WHHJpY2hhcmRA
c2lnbWEtc3Rhci5hdAAKCRBm+VmF6xi7wRnyD/40jc4PA1pP3dJcXqdqwSeN+vJZ
YWu307rE+giWWg6vRKa8zu3z614579UC7EE/I9miSrPNPYCi9VTLNzJGNMvn8aSf
8seMrbhW0kz29T4YZ5fESr6x3hMsSdmIWZkPobruul8oBGmNcUm3Ag3MBM4XbQTm
5AcWUdXVQUXPROK/Xm04hNa5pJ6wkSu5CxA+mf9YM2ZYYPPdCblxxq3NsDX99vDw
gZup7JndSzpk+IpZMQIEKUP83vh5YgCU06YPjXi5YIfXl+sQnpH0fyrWm3+1C0Yz
4T80rd3fm+7+obXdAI29mhcoZ09fGayozfqjU/fV3edW43+pUvRWced13vuLqz9Q
JannCFeN+v/nB6OPlj4JGkgNunZ5M3r6ZZIQBbY9RJuZgG0/FMbpYb62RY1z/jg9
YA7e3J/R02i7tHnPbcIz6ngKE0c42VKxTdATaybXVunx5ZPip7txj9OeJbfIYUrr
CbLMdiqIJUAAheHMUrTiF3jDNwEiMhBZA4dAGDvLmpLuyfMlN8Lwje9BdRd5VNKp
zwEGUQkDWLxniFYLtmbceFSa4IQT6z70XJn1pqdDvgjxfp8trEqhtp9GMxA2u6TA
adcug5gUzRWMQ2QuyoKIv6tkjmnII5N2KzhZH9hwBReRJUlKY9WQ9jowcGrPXhbw
F2prIwBxp8drneOeKg==
=CGLq
-----END PGP SIGNATURE-----
Merge tag 'upstream-4.19-rc4' of git://git.infradead.org/linux-ubifs
Richard writes:
"This pull request contains fixes for UBIFS:
- A wrong UBIFS assertion in mount code
- Fix for a NULL pointer deref in mount code
- Revert of a bad fix for xattrs"
* tag 'upstream-4.19-rc4' of git://git.infradead.org/linux-ubifs:
Revert "ubifs: xattr: Don't operate on deleted inodes"
ubifs: drop false positive assertion
ubifs: Check for name being NULL while mounting
-----BEGIN PGP SIGNATURE-----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=z9pB
-----END PGP SIGNATURE-----
Merge tag 'for-linus-20180920' of git://git.kernel.dk/linux-block
Jens writes:
"Storage fixes for 4.19-rc5
- Fix for leaking kernel pointer in floppy ioctl (Andy Whitcroft)
- NVMe pull request from Christoph, and a single ANA log page fix
(Hannes)
- Regression fix for libata qd32 support, where we trigger an illegal
active command transition. This fixes a CD-ROM detection issue that
was reported, but could also trigger premature completion of the
internal tag (me)"
* tag 'for-linus-20180920' of git://git.kernel.dk/linux-block:
floppy: Do not copy a kernel pointer to user memory in FDGETPRM ioctl
libata: mask swap internal and hardware tag
nvme: count all ANA groups for ANA Log page
-----BEGIN PGP SIGNATURE-----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=56tH
-----END PGP SIGNATURE-----
Merge tag 'drm-fixes-2018-09-21' of git://anongit.freedesktop.org/drm/drm
David writes:
"drm fixes for 4.19-rc5:
- core: fix debugfs for atomic, fix the check for atomic for
non-modesetting drivers
- amdgpu: adds a new PCI id, some kfd fixes and a sdma fix
- i915: a bunch of GVT fixes.
- vc4: scaling fix
- vmwgfx: modesetting fixes and a old buffer eviction fix
- udl: framebuffer destruction fix
- sun4i: disable on R40 fix until next kernel
- pl111: NULL termination on table fix"
* tag 'drm-fixes-2018-09-21' of git://anongit.freedesktop.org/drm/drm: (21 commits)
drm/amdkfd: Fix ATS capablity was not reported correctly on some APUs
drm/amdkfd: Change the control stack MTYPE from UC to NC on GFX9
drm/amdgpu: Fix SDMA HQD destroy error on gfx_v7
drm/vmwgfx: Fix buffer object eviction
drm/vmwgfx: Don't impose STDU limits on framebuffer size
drm/vmwgfx: limit mode size for all display unit to texture_max
drm/vmwgfx: limit screen size to stdu_max during check_modeset
drm/vmwgfx: don't check for old_crtc_state enable status
drm/amdgpu: add new polaris pci id
drm: sun4i: drop second PLL from A64 HDMI PHY
drm: fix drm_drv_uses_atomic_modeset on non modesetting drivers.
drm/i915/gvt: clear ggtt entries when destroy vgpu
drm/i915/gvt: request srcu_read_lock before checking if one gfn is valid
drm/i915/gvt: Add GEN9_CLKGATE_DIS_4 to default BXT mmio handler
drm/i915/gvt: Init PHY related registers for BXT
drm/atomic: Use drm_drv_uses_atomic_modeset() for debugfs creation
drm/fb-helper: Remove set but not used variable 'connector_funcs'
drm: udl: Destroy framebuffer only if it was initialized
drm/sun4i: Remove R40 display pipeline compatibles
drm/pl111: Make sure of_device_id tables are NULL terminated
...
We met a kernel panic when enabling earlycon, which is due to the fixmap
address of earlycon is not statically setup.
Currently the static fixmap setup in head_64.S only covers 2M virtual
address space, while it actually could be in 4M space with different
kernel configurations, e.g. when VSYSCALL emulation is disabled.
So increase the static space to 4M for now by defining FIXMAP_PMD_NUM to 2,
and add a build time check to ensure that the fixmap is covered by the
initial static page tables.
Fixes: 1ad83c858c ("x86_64,vsyscall: Make vsyscall emulation configurable")
Suggested-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Feng Tang <feng.tang@intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: kernel test robot <rong.a.chen@intel.com>
Reviewed-by: Juergen Gross <jgross@suse.com> (Xen parts)
Cc: H Peter Anvin <hpa@linux.intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Yinghai Lu <yinghai@kernel.org>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Andy Lutomirsky <luto@kernel.org>
Cc: stable@vger.kernel.org
Link: https://lkml.kernel.org/r/20180920025828.23699-1-feng.tang@intel.com
9092c71bb7 ("mm: use sc->priority for slab shrink targets") changed the
way that the target slab pressure is calculated and made it
priority-based:
delta = freeable >> priority;
delta *= 4;
do_div(delta, shrinker->seeks);
The problem is that on a default priority (which is 12) no pressure is
applied at all, if the number of potentially reclaimable objects is less
than 4096 (1<<12).
This causes the last objects on slab caches of no longer used cgroups to
(almost) never get reclaimed. It's obviously a waste of memory.
It can be especially painful, if these stale objects are holding a
reference to a dying cgroup. Slab LRU lists are reparented on memcg
offlining, but corresponding objects are still holding a reference to the
dying cgroup. If we don't scan these objects, the dying cgroup can't go
away. Most likely, the parent cgroup hasn't any directly charged objects,
only remaining objects from dying children cgroups. So it can easily hold
a reference to hundreds of dying cgroups.
If there are no big spikes in memory pressure, and new memory cgroups are
created and destroyed periodically, this causes the number of dying
cgroups grow steadily, causing a slow-ish and hard-to-detect memory
"leak". It's not a real leak, as the memory can be eventually reclaimed,
but it could not happen in a real life at all. I've seen hosts with a
steadily climbing number of dying cgroups, which doesn't show any signs of
a decline in months, despite the host is loaded with a production
workload.
It is an obvious waste of memory, and to prevent it, let's apply a minimal
pressure even on small shrinker lists. E.g. if there are freeable
objects, let's scan at least min(freeable, scan_batch) objects.
This fix significantly improves a chance of a dying cgroup to be
reclaimed, and together with some previous patches stops the steady growth
of the dying cgroups number on some of our hosts.
Link: http://lkml.kernel.org/r/20180905230759.12236-1-guro@fb.com
Fixes: 9092c71bb7 ("mm: use sc->priority for slab shrink targets")
Signed-off-by: Roman Gushchin <guro@fb.com>
Acked-by: Rik van Riel <riel@surriel.com>
Cc: Josef Bacik <jbacik@fb.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Shakeel Butt <shakeelb@google.com>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Vladimir Davydov <vdavydov.dev@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
The 'm' kcore_list item could point to kclist_head, and it is incorrect to
look at m->addr / m->size in this case.
There is no choice but to run through the list of entries for every
address if we did not find any entry in the previous iteration
Reset 'm' to NULL in that case at Omar Sandoval's suggestion.
[akpm@linux-foundation.org: add comment]
Link: http://lkml.kernel.org/r/1536100702-28706-1-git-send-email-asmadeus@codewreck.org
Fixes: bf991c2231 ("proc/kcore: optimize multiple page reads")
Signed-off-by: Dominique Martinet <asmadeus@codewreck.org>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Omar Sandoval <osandov@osandov.com>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Cc: Eric Biederman <ebiederm@xmission.com>
Cc: James Morse <james.morse@arm.com>
Cc: Bhupesh Sharma <bhsharma@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Make the clone and fork syscalls return EAGAIN when the limit on the
number of pids /proc/sys/kernel/pid_max is exceeded.
Currently, when the pid_max limit is exceeded, the kernel will return
ENOSPC from the fork and clone syscalls. This is contrary to the
documented behaviour, which explicitly calls out the pid_max case as one
where EAGAIN should be returned. It also leads to really confusing error
messages in userspace programs which will complain about a lack of disk
space when they fail to create processes/threads for this reason.
This error is being returned because alloc_pid() uses the idr api to find
a new pid; when there are none available, idr_alloc_cyclic() returns
-ENOSPC, and this is being propagated back to userspace.
This behaviour has been broken before, and was explicitly fixed in
commit 35f71bc0a0 ("fork: report pid reservation failure properly"),
so I think -EAGAIN is definitely the right thing to return in this case.
The current behaviour change dates from commit 95846ecf9d ("pid:
replace pid bitmap implementation with IDR AIP") and was I believe
unintentional.
This patch has no impact on the case where allocating a pid fails because
the child reaper for the namespace is dead; that case will still return
-ENOMEM.
Link: http://lkml.kernel.org/r/20180903111016.46461-1-ktsanaktsidis@zendesk.com
Fixes: 95846ecf9d ("pid: replace pid bitmap implementation with IDR AIP")
Signed-off-by: KJ Tsanaktsidis <ktsanaktsidis@zendesk.com>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Gargi Sharma <gs051095@gmail.com>
Cc: Rik van Riel <riel@redhat.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Dave, Andy and Peter are de facto overseing the mm parts of X86. Add an
explicit maintainers entry.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Dave Hansen <dave.hansen@linux.intel.com>
Acked-by: Andy Lutomirski <luto@kernel.org>
Acked-by: Peter Zijlstra <peterz@infradead.org>
Acked-by: Ingo Molnar <mingo@kernel.org>
Reinette Chatre is doing great job on enabling pseudo-locking and other
features in RDT. Add her as co-maintainer for RDT.
Suggested-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Fenghua Yu <fenghua.yu@intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Ingo Molnar <mingo@kernel.org>
Acked-by: Reinette Chatre <reinette.chatre@intel.com>
Cc: "H Peter Anvin" <hpa@zytor.com>
Cc: "Tony Luck" <tony.luck@intel.com>
Link: https://lkml.kernel.org/r/1537472228-221799-1-git-send-email-fenghua.yu@intel.com
This reverts commit 11a6fc3dc7.
UBIFS wants to assert that xattr operations are only issued on files
with positive link count. The said patch made this operations return
-ENOENT for unlinked files such that the asserts will no longer trigger.
This was wrong since xattr operations are perfectly fine on unlinked
files.
Instead the assertions need to be fixed/removed.
Cc: <stable@vger.kernel.org>
Fixes: 11a6fc3dc7 ("ubifs: xattr: Don't operate on deleted inodes")
Reported-by: Koen Vandeputte <koen.vandeputte@ncentric.com>
Tested-by: Joel Stanley <joel@jms.id.au>
Signed-off-by: Richard Weinberger <richard@nod.at>
The following sequence triggers
ubifs_assert(c, c->lst.taken_empty_lebs > 0);
at the end of ubifs_remount_fs():
mount -t ubifs /dev/ubi0_0 /mnt
echo 1 > /sys/kernel/debug/ubifs/ubi0_0/ro_error
umount /mnt
mount -t ubifs -o ro /dev/ubix_y /mnt
mount -o remount,ro /mnt
The resulting
UBIFS assert failed in ubifs_remount_fs at 1878 (pid 161)
is a false positive. In the case above c->lst.taken_empty_lebs has
never been changed from its initial zero value. This will only happen
when the deferred recovery is done.
Fix this by doing the assertion only when recovery has been done
already.
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Richard Weinberger <richard@nod.at>
The requested device name can be NULL or an empty string.
Check for that and refuse to continue. UBIFS has to do this manually
since we cannot use mount_bdev(), which checks for this condition.
Fixes: 1e51764a3c ("UBIFS: add new flash file system")
Reported-by: syzbot+38bd0f7865e5c6379280@syzkaller.appspotmail.com
Signed-off-by: Richard Weinberger <richard@nod.at>
The handlers of IOCTLs in kvm_arch_vcpu_ioctl() are expected to set
their return value in "r" local var and break out of switch block
when they encounter some error.
This is because vcpu_load() is called before the switch block which
have a proper cleanup of vcpu_put() afterwards.
However, KVM_{GET,SET}_NESTED_STATE IOCTLs handlers just return
immediately on error without performing above mentioned cleanup.
Thus, change these handlers to behave as expected.
Fixes: 8fcc4b5923 ("kvm: nVMX: Introduce KVM_CAP_NESTED_STATE")
Reviewed-by: Mark Kanda <mark.kanda@oracle.com>
Reviewed-by: Patrick Colp <patrick.colp@oracle.com>
Signed-off-by: Liran Alon <liran.alon@oracle.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Because CRAT_CU_FLAGS_IOMMU_PRESENT was not set in some BIOS crat, we
need to workaround this.
For future compatibility, we also overwrite the bit in capability according
to the value of needs_iommu_device.
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Yong Zhao <Yong.Zhao@amd.com>
Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
CWSR fails on Raven if the control stack is MTYPE_UC, which is used
for regular GART mappings. As a workaround we map it using MTYPE_NC.
The MEC firmware expects the control stack at one page offset from the
start of the MQD so it is part of the MQD allocation on GFXv9. AMDGPU
added a memory allocation flag just for this purpose.
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Yong Zhao <yong.zhao@amd.com>
Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
A wrong register bit was examinated for checking SDMA status so it reports
false failures. This typo only appears on gfx_v7. gfx_v8 checks the correct
bit.
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Amber Lin <Amber.Lin@amd.com>
Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
For some reason I thought GPIOLIB handles translation from GPIO ranges
to pinctrl pins but it turns out not to be the case. This means that
when GPIOs operations are performed for a pin controller having a custom
GPIO base such as Cannon Lake and Ice Lake incorrect pin number gets
used internally.
Fix this in the same way we did for lock/unlock IRQ operations and
translate the GPIO number to pin before using it.
Fixes: a60eac3239 ("pinctrl: intel: Allow custom GPIO base for pad groups")
Reported-by: Rajat Jain <rajatja@google.com>
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Tested-by: Rajat Jain <rajatja@google.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
