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  1. 28 Mar, 2021 1 commit
  3. 24 Mar, 2021 2 commits
  5. 22 Mar, 2021 11 commits
    • Bhaskar Chowdhury's avatar
      s390/kernel: fix a typo · 5671d971
      Bhaskar Chowdhury authored 
      s/struture/structure/
Signed-off-by: default avatarBhaskar Chowdhury <unixbhaskar@gmail.com>
Link: https://lore.kernel.org/r/20210322062500.3109603-1-unixbhaskar@gmail.comSigned-off-by: default avatarHeiko Carstens <hca@linux.ibm.com>
      5671d971
    • Julian Wiedmann's avatar
      s390/qdio: let driver manage the QAOB · 396c1004
      Julian Wiedmann authored 
      We are spending way too much effort on qdio-internal bookkeeping for
QAOB management & caching, and it's still not robust. Once qdio's
TX path has detached the QAOB from a PENDING buffer, we lost all
track of it until it shows up in a CQ notification again. So if the
device is torn down before that notification arrives, we leak the QAOB.

Just have the driver take care of it, and simply pass down a QAOB if
they want a TX with async-completion capability. For a buffer in PENDING
state that requires the QAOB for final completion, qeth can now also try
to recycle the buffer's QAOB rather than unconditionally freeing it.

This also eliminates the qdio_outbuf_state array, which was only needed
to transfer the aob->user1 tag from the driver to the qdio layer.
Signed-off-by: default avatarJulian Wiedmann <jwi@linux.ibm.com>
Acked-by: default avatarBenjamin Block <bblock@linux.ibm.com>
Signed-off-by: default avatarHeiko Carstens <hca@linux.ibm.com>
      396c1004
    • Niklas Schnelle's avatar
      s390/pci: move zpci_remove_device() to bus code · 95b3a8b4
      Niklas Schnelle authored 
      The zpci_remove_device() function removes the device from the PCI common
code core which is an operation dealing primarily with the zbus and PCI
bus code. With that and to match an upcoming refactoring of the
symmetric scanning part move it to the bus code.
Reviewed-by: default avatarMatthew Rosato <mjrosato@linux.ibm.com>
Signed-off-by: default avatarNiklas Schnelle <schnelle@linux.ibm.com>
Signed-off-by: default avatarHeiko Carstens <hca@linux.ibm.com>
      95b3a8b4
    • Niklas Schnelle's avatar
      s390/pci: unify de-/configure for slots and events · 2631f6b6
      Niklas Schnelle authored 
      A zPCI event with PEC 0x0301 for an existing zPCI device goes through
the same actions as enable_slot(). Similarly a zPCI event with PEC
0x0303 does the same steps as disable_slot().
We can thus unify both actions as zpci_configure_device() respectively
zpci_deconfigure_device().
Reviewed-by: default avatarMatthew Rosato <mjrosato@linux.ibm.com>
Signed-off-by: default avatarNiklas Schnelle <schnelle@linux.ibm.com>
Signed-off-by: default avatarHeiko Carstens <hca@linux.ibm.com>
      2631f6b6
    • Vineeth Vijayan's avatar
      s390/cio: add CRW inject functionality · a4f17cc7
      Vineeth Vijayan authored 
      This patch introduces the mechanism to inject artificial events to the
CIO layer.

One of the main-event type which triggers the CommonIO operations are
Channel Report events. When a malfunction or other condition affecting
channel-subsystem operation is recognized, a Channel Report Word
(consisting of one or more CRWs) describing the condition is made
pending for retrieval and analysis by the program. The CRW contains
information concerning the identity and state of a facility following
the detection of the malfunction or other condition.

The patch introduces two debugfs interfaces which can be used to inject
'artificial' events from the userspace. It is intended to provide an easy
means to increase the test coverage for CIO code. And this functionality
can be enabled via a new configuration option CONFIG_CIO_INJECT.

The newly introduces debugfs interfaces can be used as mentioned below
to generate different fake-events. To use the crw_inject, first we should
enable it by using enable_inject interface.
i.e

echo 1 > /sys/kernel/debug/s390/cio/enable_inject

After the first step, user can simulate CRW as follows:

echo <solicited> <overflow> <chaining> <rsc> <ancillary> <erc> <rsid> \
                               > /sys/kernel/debug/s390/cio/crw_inject

Example:
A permanent error ERC on CHPID 0x60 would look like this:

  echo 0 0 0 4 0 6 0x60 > /sys/kernel/debug/s390/cio/crw_inject

and an initialized ERC on the same CHPID:

  echo 0 0 0 4 0 2 0x60 > /sys/kernel/debug/s390/cio/crw_inject
Signed-off-by: default avatarVineeth Vijayan <vneethv@linux.ibm.com>
Reviewed-by: default avatarPeter Oberparleiter <oberpar@linux.ibm.com>
Signed-off-by: default avatarHeiko Carstens <hca@linux.ibm.com>
      a4f17cc7
    • Vineeth Vijayan's avatar
      s390/cio: introduce CIO debugfs directory · 64a715ab
      Vineeth Vijayan authored 
      This patch introduces an s390 Common I/O layer debugfs directory that is
intended to provide access to debugging-related CIO functions and data.
The directory is created as /sys/kernel/debug/s390/cio
Signed-off-by: default avatarVineeth Vijayan <vneethv@linux.ibm.com>
Reviewed-by: default avatarPeter Oberparleiter <oberpar@linux.ibm.com>
Signed-off-by: default avatarHeiko Carstens <hca@linux.ibm.com>
      64a715ab
    • Niklas Schnelle's avatar
      s390/pci: add zpci_event_hard_deconfigured() · dee60c0d
      Niklas Schnelle authored 
      Extract the handling of PEC 0x0304 into a function and make sure we only
attempt to disable the function if it is enabled. Also check for errors
returned by zpci_disable_device() and leave the function alone if there
are any.
Reviewed-by: default avatarMatthew Rosato <mjrosato@linux.ibm.com>
Signed-off-by: default avatarNiklas Schnelle <schnelle@linux.ibm.com>
Signed-off-by: default avatarHeiko Carstens <hca@linux.ibm.com>
      dee60c0d
    • Niklas Schnelle's avatar
      s390/pci: deconfigure device on release · a9045c22
      Niklas Schnelle authored 
      When zpci_release_device() is called on a zPCI function that is still
configured it would not be deconfigured. Until now this hasn't caused
any problems because zpci_zdev_put() is only ever called for devices
in Standby or Reserved. Fix it by adding sclp_pci_deconfigure() to the
switch when in Configured state.
Reviewed-by: default avatarMatthew Rosato <mjrosato@linux.ibm.com>
Signed-off-by: default avatarNiklas Schnelle <schnelle@linux.ibm.com>
Signed-off-by: default avatarHeiko Carstens <hca@linux.ibm.com>
      a9045c22
    • Niklas Schnelle's avatar
      s390/pci: refactor zpci function states · f6576a1b
      Niklas Schnelle authored 
      The current zdev->state mixes the configuration states supported by CLP
with an additional Online state which is used inconsistently to include
enabled zPCI functions which are not yet visible to the common PCI
subsytem. In preparation for a clean separation between architected
configuration states and fine grained function states remove the Online
function state.

Where we previously checked for Online it is more accurate to check if
the function is enabled to avoid an edge case where a disabled device
was still treated as Online. This also simplifies checks whether
a function is configured as this is now directly reflected by its
function state.
Reviewed-by: default avatarMatthew Rosato <mjrosato@linux.ibm.com>
Signed-off-by: default avatarNiklas Schnelle <schnelle@linux.ibm.com>
Signed-off-by: default avatarHeiko Carstens <hca@linux.ibm.com>
      f6576a1b
    • Peter Oberparleiter's avatar
      s390/sclp: increase sclp console line length · 98ce70b7
      Peter Oberparleiter authored 
      Kernel and console/TTY messages written to the SCLP line mode console
are wrapped at 80 characters per line by the associated SCLP driver.
This makes long lines of output difficult to read, and requires editing
of wrapped lines copied from the output device.

Neither the firmware interface used to access the SCLP console, nor the
HMC "Operating System Messages" web interface that displays these
messages require such a length limit. Also other operating systems such
as z/VM do not impose similar limits on messages they emit to the same
console device.

This patch therefore increases the limit to 320 characters per line to
make SCLP line mode console output more readable. As a result 99% of
lines written during a typical boot will not be wrapped, compared to
about 50% wrapped lines at 80 characters per line. Another positive
side-effect of this change is that the HMC console interface is able to
keep more messages in its history buffer due to fewer line-breaks being
generated.

In a worst case scenario this means that a 4k console buffer is emitted
with the last ~400 bytes empty (320 text + 78 headers). This is more
than offset by the fact that each line that is not truncated saves 78
header bytes in the buffer. As a result the actual number of emitted
buffers should be about the same as with the 80 character limit.

This patch also removes the differentiation between line lengths of
SCLP line mode output on z/VM and non-z/VM systems. While the z/VM
hypervisor adds a prefix in front of each line ('xx: ' where xx is the
number of the CPU issuing the message), adjusting Linux line lengths did
not significantly increase readability of console output, and makes even
less of a difference with longer lines.
Signed-off-by: default avatarPeter Oberparleiter <oberpar@linux.ibm.com>
Tested-by: default avatarNiklas Schnelle <schnelle@linux.ibm.com>
Acked-by: default avatarHeiko Carstens <hca@linux.ibm.com>
Signed-off-by: default avatarHeiko Carstens <hca@linux.ibm.com>
      98ce70b7
    • Janosch Frank's avatar
      s390/uv: add prot virt guest/host indication files · 37564ed8
      Janosch Frank authored 
      Let's export the prot_virt_guest and prot_virt_host variables into the
UV sysfs firmware interface to make them easily consumable by
administrators.

prot_virt_host being 1 indicates that we did the UV
initialization (opt-in)

prot_virt_guest being 1 indicates that the UV indicates the share and
unshare ultravisor calls which is an indication that we are running as
a protected guest.
Signed-off-by: default avatarJanosch Frank <frankja@linux.ibm.com>
Acked-by: default avatarChristian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: default avatarHeiko Carstens <hca@linux.ibm.com>
      37564ed8
  7. 21 Mar, 2021 23 commits
  9. 20 Mar, 2021 3 commits
    • Thomas Gleixner's avatar
      genirq: Disable interrupts for force threaded handlers · 81e2073c
      Thomas Gleixner authored 
      With interrupt force threading all device interrupt handlers are invoked
from kernel threads. Contrary to hard interrupt context the invocation only
disables bottom halfs, but not interrupts. This was an oversight back then
because any code like this will have an issue:

thread(irq_A)
  irq_handler(A)
    spin_lock(&foo->lock);

interrupt(irq_B)
  irq_handler(B)
    spin_lock(&foo->lock);

This has been triggered with networking (NAPI vs. hrtimers) and console
drivers where printk() happens from an interrupt which interrupted the
force threaded handler.

Now people noticed and started to change the spin_lock() in the handler to
spin_lock_irqsave() which affects performance or add IRQF_NOTHREAD to the
interrupt request which in turn breaks RT.

Fix the root cause and not the symptom and disable interrupts before
invoking the force threaded handler which preserves the regular semantics
and the usefulness of the interrupt force threading as a general debugging
tool.

For not RT this is not changing much, except that during the execution of
the threaded handler interrupts are delayed until the handler
returns. Vs. scheduling and softirq processing there is no difference.

For RT kernels there is no issue.

Fixes: 8d32a307 ("genirq: Provide forced interrupt threading")
Reported-by: default avatarJohan Hovold <johan@kernel.org>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
Reviewed-by: default avatarJohan Hovold <johan@kernel.org>
Acked-by: default avatarSebastian Andrzej Siewior <bigeasy@linutronix.de>
Link: https://lore.kernel.org/r/20210317143859.513307808@linutronix.de
      81e2073c
    • Linus Torvalds's avatar
      Merge tag 'riscv-for-linus-5.12-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux · 812da4d3
      Linus Torvalds authored 
      Pull RISC-V fixes from Palmer Dabbelt:
 "A handful of fixes for 5.12:

   - fix the SBI remote fence numbers for hypervisor fences, which had
     been transcribed in the wrong order in Linux. These fences are only
     used with the KVM patches applied.

   - fix a whole host of build warnings, these should have no functional
     change.

   - fix init_resources() to prevent an off-by-one error from causing an
     out-of-bounds array reference. This was manifesting during boot on
     vexriscv.

   - ensure the KASAN mappings are visible before proceeding to use
     them"

* tag 'riscv-for-linus-5.12-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux:
  riscv: Correct SPARSEMEM configuration
  RISC-V: kasan: Declare kasan_shallow_populate() static
  riscv: Ensure page table writes are flushed when initializing KASAN vmalloc
  RISC-V: Fix out-of-bounds accesses in init_resources()
  riscv: Fix compilation error with Canaan SoC
  ftrace: Fix spelling mistake "disabed" -> "disabled"
  riscv: fix bugon.cocci warnings
  riscv: process: Fix no prototype for arch_dup_task_struct
  riscv: ftrace: Use ftrace_get_regs helper
  riscv: process: Fix no prototype for show_regs
  riscv: syscall_table: Reduce W=1 compilation warnings noise
  riscv: time: Fix no prototype for time_init
  riscv: ptrace: Fix no prototype warnings
  riscv: sbi: Fix comment of __sbi_set_timer_v01
  riscv: irq: Fix no prototype warning
  riscv: traps: Fix no prototype warnings
  RISC-V: correct enum sbi_ext_rfence_fid
      812da4d3
    • Linus Torvalds's avatar
      Merge tag '5.12-rc3-smb3' of git://git.samba.org/sfrench/cifs-2.6 · bfdc4aa9
      Linus Torvalds authored 
      Pull cifs fixes from Steve French:
 "Five cifs/smb3 fixes - three for stable, including an important ACL
  fix and security signature fix"

* tag '5.12-rc3-smb3' of git://git.samba.org/sfrench/cifs-2.6:
  cifs: fix allocation size on newly created files
  cifs: warn and fail if trying to use rootfs without the config option
  fs/cifs/: fix misspellings using codespell tool
  cifs: Fix preauth hash corruption
  cifs: update new ACE pointer after populate_new_aces.
      bfdc4aa9
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