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authorLinus Torvalds <torvalds@linux-foundation.org>2017-09-07 10:15:40 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2017-09-07 10:15:40 -0700
commitbac65d9d87b383471d8d29128319508d71b74180 (patch)
treec087cca1f1db1045cce08a3bff7c775c66e437bf /Documentation/ABI/testing/ppc-memtrace
parentf92e3da18b7d5941468040af962c201235148301 (diff)
parent265601f034df3566f22da11240977aab8860f6a7 (diff)
Merge tag 'powerpc-4.14-1' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux
Pull powerpc updates from Michael Ellerman: "Nothing really major this release, despite quite a lot of activity. Just lots of things all over the place. Some things of note include: - Access via perf to a new type of PMU (IMC) on Power9, which can count both core events as well as nest unit events (Memory controller etc). - Optimisations to the radix MMU TLB flushing, mostly to avoid unnecessary Page Walk Cache (PWC) flushes when the structure of the tree is not changing. - Reworks/cleanups of do_page_fault() to modernise it and bring it closer to other architectures where possible. - Rework of our page table walking so that THP updates only need to send IPIs to CPUs where the affected mm has run, rather than all CPUs. - The size of our vmalloc area is increased to 56T on 64-bit hash MMU systems. This avoids problems with the percpu allocator on systems with very sparse NUMA layouts. - STRICT_KERNEL_RWX support on PPC32. - A new sched domain topology for Power9, to capture the fact that pairs of cores may share an L2 cache. - Power9 support for VAS, which is a new mechanism for accessing coprocessors, and initial support for using it with the NX compression accelerator. - Major work on the instruction emulation support, adding support for many new instructions, and reworking it so it can be used to implement the emulation needed to fixup alignment faults. - Support for guests under PowerVM to use the Power9 XIVE interrupt controller. And probably that many things again that are almost as interesting, but I had to keep the list short. Plus the usual fixes and cleanups as always. Thanks to: Alexey Kardashevskiy, Alistair Popple, Andreas Schwab, Aneesh Kumar K.V, Anju T Sudhakar, Arvind Yadav, Balbir Singh, Benjamin Herrenschmidt, Bhumika Goyal, Breno Leitao, Bryant G. Ly, Christophe Leroy, Cédric Le Goater, Dan Carpenter, Dou Liyang, Frederic Barrat, Gautham R. Shenoy, Geliang Tang, Geoff Levand, Hannes Reinecke, Haren Myneni, Ivan Mikhaylov, John Allen, Julia Lawall, LABBE Corentin, Laurentiu Tudor, Madhavan Srinivasan, Markus Elfring, Masahiro Yamada, Matt Brown, Michael Neuling, Murilo Opsfelder Araujo, Nathan Fontenot, Naveen N. Rao, Nicholas Piggin, Oliver O'Halloran, Paul Mackerras, Rashmica Gupta, Rob Herring, Rui Teng, Sam Bobroff, Santosh Sivaraj, Scott Wood, Shilpasri G Bhat, Sukadev Bhattiprolu, Suraj Jitindar Singh, Tobin C. Harding, Victor Aoqui" * tag 'powerpc-4.14-1' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux: (321 commits) powerpc/xive: Fix section __init warning powerpc: Fix kernel crash in emulation of vector loads and stores powerpc/xive: improve debugging macros powerpc/xive: add XIVE Exploitation Mode to CAS powerpc/xive: introduce H_INT_ESB hcall powerpc/xive: add the HW IRQ number under xive_irq_data powerpc/xive: introduce xive_esb_write() powerpc/xive: rename xive_poke_esb() in xive_esb_read() powerpc/xive: guest exploitation of the XIVE interrupt controller powerpc/xive: introduce a common routine xive_queue_page_alloc() powerpc/sstep: Avoid used uninitialized error axonram: Return directly after a failed kzalloc() in axon_ram_probe() axonram: Improve a size determination in axon_ram_probe() axonram: Delete an error message for a failed memory allocation in axon_ram_probe() powerpc/powernv/npu: Move tlb flush before launching ATSD powerpc/macintosh: constify wf_sensor_ops structures powerpc/iommu: Use permission-specific DEVICE_ATTR variants powerpc/eeh: Delete an error out of memory message at init time powerpc/mm: Use seq_putc() in two functions macintosh: Convert to using %pOF instead of full_name ...
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+What: /sys/kernel/debug/powerpc/memtrace
+Date: Aug 2017
+KernelVersion: 4.14
+Contact: linuxppc-dev@lists.ozlabs.org
+Description: This folder contains the relevant debugfs files for the
+ hardware trace macro to use. CONFIG_PPC64_HARDWARE_TRACING
+ must be set.
+
+What: /sys/kernel/debug/powerpc/memtrace/enable
+Date: Aug 2017
+KernelVersion: 4.14
+Contact: linuxppc-dev@lists.ozlabs.org
+Description: Write an integer containing the size in bytes of the memory
+ you want removed from each NUMA node to this file - it must be
+ aligned to the memblock size. This amount of RAM will be removed
+ from the kernel mappings and the following debugfs files will be
+ created. This can only be successfully done once per boot. Once
+ memory is successfully removed from each node, the following
+ files are created.
+
+What: /sys/kernel/debug/powerpc/memtrace/<node-id>
+Date: Aug 2017
+KernelVersion: 4.14
+Contact: linuxppc-dev@lists.ozlabs.org
+Description: This directory contains information about the removed memory
+ from the specific NUMA node.
+
+What: /sys/kernel/debug/powerpc/memtrace/<node-id>/size
+Date: Aug 2017
+KernelVersion: 4.14
+Contact: linuxppc-dev@lists.ozlabs.org
+Description: This contains the size of the memory removed from the node.
+
+What: /sys/kernel/debug/powerpc/memtrace/<node-id>/start
+Date: Aug 2017
+KernelVersion: 4.14
+Contact: linuxppc-dev@lists.ozlabs.org
+Description: This contains the start address of the removed memory.
+
+What: /sys/kernel/debug/powerpc/memtrace/<node-id>/trace
+Date: Aug 2017
+KernelVersion: 4.14
+Contact: linuxppc-dev@lists.ozlabs.org
+Description: This is where the hardware trace macro will output the trace
+ it generates.