Merge tag 's390-5.13-1' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux

Pull s390 updates from Heiko Carstens:

 - fix buffer size for in-kernel disassembler for ebpf programs.

 - fix two memory leaks in zcrypt driver.

 - expose PCI device UID as index, including an indicator if the uid is
   unique.

 - remove some oprofile leftovers.

 - improve stack unwinder tests.

 - don't use gcc atomic builtins anymore, just like all other
   architectures. Even though I'm sure the current code is ok, I totally
   dislike that s390 is the only architecture being special here;
   especially considering that there was a lengthly discussion about
   this topic and the outcome was not to use the builtins. Therefore
   open-code atomic ops again with inline assembly and switch to gcc
   builtins as soon as other architectures are doing.

 - couple of other changes to atomic and cmpxchg, and use
   atomic-instrumented.h for KASAN.

 - separate zbus creation, registration, and scanning in our PCI code
   which allows for cleaner and easier handling.

 - a rather large change to the vfio-ap code to fix circular locking
   dependencies when updating crypto masks.

 - move QAOB handling from qdio layer down to drivers.

 - add CRW inject facility to common I/O layer. This adds debugs files
   which allow to generate artificial events from user space for testing
   purposes.

 - increase SCLP console line length from 80 to 320 characters to avoid
   odd wrapped lines.

 - add protected virtualization guest and host indication files, which
   indicate either that a guest is running in pv mode or if the
   hypervisor is capable of starting pv guests.

 - various other small fixes and improvements all over the place.

* tag 's390-5.13-1' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux: (53 commits)
  s390/disassembler: increase ebpf disasm buffer size
  s390/archrandom: add parameter check for s390_arch_random_generate
  s390/zcrypt: fix zcard and zqueue hot-unplug memleak
  s390/pci: expose a PCI device's UID as its index
  s390/atomic,cmpxchg: always inline __xchg/__cmpxchg
  s390/smp: fix do_restart() prototype
  s390: get rid of oprofile leftovers
  s390/atomic,cmpxchg: make constraints work with old compilers
  s390/test_unwind: print test suite start/end info
  s390/cmpxchg: use unsigned long values instead of void pointers
  s390/test_unwind: add WARN if tests failed
  s390/test_unwind: unify error handling paths
  s390: update defconfigs
  s390/spinlock: use R constraint in inline assembly
  s390/atomic,cmpxchg: switch to use atomic-instrumented.h
  s390/cmpxchg: get rid of gcc atomic builtins
  s390/atomic: get rid of gcc atomic builtins
  s390/atomic: use proper constraints
  s390/atomic: move remaining inline assemblies to atomic_ops.h
  s390/bitops: make bitops only work on longs
  ...

2 files changed, 18 insertions, 7 deletions

diff --git a/Documentation/ABI/testing/sysfs-bus-pci b/Documentation/ABI/testing/sysfs-bus-pci
index 25c9c39770c6..1241b6d11a52 100644
--- a/Documentation/ABI/testing/sysfs-bus-pci
+++ b/Documentation/ABI/testing/sysfs-bus-pci
@@ -195,10 +195,13 @@ What:		/sys/bus/pci/devices/.../index
 Date:		July 2010
 Contact:	Narendra K <narendra_k@dell.com>, linux-bugs@dell.com
 Description:
-		Reading this attribute will provide the firmware
-		given instance (SMBIOS type 41 device type instance) of the
-		PCI device. The attribute will be created only if the firmware
-		has given an instance number to the PCI device.
+		Reading this attribute will provide the firmware given instance
+		number of the PCI device.  Depending on the platform this can
+		be for example the SMBIOS type 41 device type instance or the
+		user-defined ID (UID) on s390. The attribute will be created
+		only if the firmware has given an instance number to the PCI
+		device and that number is guaranteed to uniquely identify the
+		device in the system.
 Users:
 		Userspace applications interested in knowing the
 		firmware assigned device type instance of the PCI
diff --git a/Documentation/s390/pci.rst b/Documentation/s390/pci.rst
index 492850bff316..8157f0cddbc2 100644
--- a/Documentation/s390/pci.rst
+++ b/Documentation/s390/pci.rst
@@ -50,7 +50,8 @@ Entries specific to zPCI functions and entries that hold zPCI information.
 * /sys/bus/pci/slots/XXXXXXXX
 
   The slot entries are set up using the function identifier (FID) of the
-  PCI function.
+  PCI function. The format depicted as XXXXXXXX above is 8 hexadecimal digits
+  with 0 padding and lower case hexadecimal digitis.
 
   - /sys/bus/pci/slots/XXXXXXXX/power
 
@@ -88,8 +89,15 @@ Entries specific to zPCI functions and entries that hold zPCI information.
     is attached to.
 
   - uid
-    The unique identifier (UID) is defined when configuring an LPAR and is
-    unique in the LPAR.
+    The user identifier (UID) may be defined as part of the machine
+    configuration or the z/VM or KVM guest configuration. If the accompanying
+    uid_is_unique attribute is 1 the platform guarantees that the UID is unique
+    within that instance and no devices with the same UID can be attached
+    during the lifetime of the system.
+
+  - uid_is_unique
+    Indicates whether the user identifier (UID) is guaranteed to be and remain
+    unique within this Linux instance.
 
   - pfip/segmentX
     The segments determine the isolation of a function.