- 27 Aug, 2015 1 commit
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Alexander Kuleshov authored
printk() supports %*ph format specifier for printing a small buffers, let's use it intead of %02x %02x... Signed-off-by:
Alexander Kuleshov <kuleshovmail@gmail.com> Signed-off-by:
Martin Schwidefsky <schwidefsky@de.ibm.com>
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- 26 Aug, 2015 4 commits
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Hendrik Brueckner authored
Implement magic sysrequest handling for the VT220 terminal (also known as the Integrated ASCII console on the HMC/SE). To invoke a "magic sysrequest" function, press "Ctrl+o" followed by a second character that designates the debugging function. The handling of the sysrq is scheduled away from the SCLP IRQ context; because large amounts of sysrq output might fill up the console buffers. The console might deadlock because it cannot empty the buffers while still in the receiving IRQ context. This behavior is the same as for the SCLP console. Reported-by:
Horst Weber <hweber@de.ibm.com> Signed-off-by:
Hendrik Brueckner <brueckner@linux.vnet.ibm.com> Reviewed-by:
Peter Oberparleiter <oberpar@linux.vnet.ibm.com> Signed-off-by:
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Hendrik Brueckner authored
Extract the sysrq handling from the ctrlchar_handle() into a separate function that can be directly used by other users. Introduce a new sysrq_work structure to embed the work_struct and to specify the magic sysrq function to be invoked. Signed-off-by:
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Michael Holzheu authored
The NUMA system call "__ARCH_WANT" defines are not used by the Linux kernel, therefore remove them. Fixes: 9df62adffeb0 ("s390/numa: add core infrastructure") Signed-off-by:Michael Holzheu <holzheu@linux.vnet.ibm.com> Signed-off-by:
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Martin Schwidefsky authored
If a 3270 terminal is disconnected and later reconnected again, it gets an unsolicited device end. This is currently ignored and you have to hit the clear key to get the screen redrawn. Add an automatic full redraw of the screen for this case. Signed-off-by:
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- 19 Aug, 2015 11 commits
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Martin Schwidefsky authored
Fix a couple of warnings like this: [linux-4.2-rc7/drivers/s390/block/dcssblk.c:553]: (style) Array index 'j' is used before limits check. Reported-by:
David Binderman <dcb314@hotmail.com> Signed-off-by:
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Martin Schwidefsky authored
With the removal of the dynamic reallocation of page tables for KVM (see git commit 0b46e0a3) the page table allocation / freeing code can be simplified. The page table free code can now use the alloc_pgste bit in the mm context to decide if a page table is 2K or 4K, there is no mix of different sized page tables anymore. This eliminates the need to use "page->_mapcount == 0" to check for 4K page table. Use the lower two bits in page->_mapcount to indicate which 2K fragments of the 4K page are in use. As 31-bit support is gone, remove the two defines ALLOC_ORDER and FRAG_MASK and use the constants directly where appropriate. Signed-off-by:
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Sebastian Ott authored
The error messages in pci_insn are for debug purposes only. Move them to the debugfs. Reviewed-by:
Gerald Schaefer <gerald.schaefer@de.ibm.com> Signed-off-by:
Sebastian Ott <sebott@linux.vnet.ibm.com> Signed-off-by:
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Heiko Carstens authored
Change machine_check_init() to an early_initcall(). This makes sure it will be called before all other cpus are online and therfore saves us a lot of pointless smp_call_function() calls. The control register settings will be forwarded to the other cpus when they will be brought online. Signed-off-by:
Heiko Carstens <heiko.carstens@de.ibm.com> Reviewed-by:
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Heiko Carstens authored
There is no need to busy loop and monopolize a cpu for up to ~2 seconds. The code in question that calls mdelay() is preemptible anyway, so better let the kernel schedule different processes than just looping and causing unnecessary delays. Signed-off-by:
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Heiko Carstens authored
The z/VM driver sets bit "63-22" in control register zero to one in order to enable the CP Service interrupt (0x2603). However the irq subclass mask that normally corresponds to the CP Service interrupt is "63-54" (== "63-22-32"). So it looks like the author read the documentation with the 32 bit sized cr0 register bit positions (== 22), but didn't realize that bit numbers change, if applied to a 64 bit register (== 54) due to the numbering scheme. Also use irq_subclass_register() instead if ctl_set_bit() since multiple services depend on the service signal subclass mask, which is the correct bit. This also explains why nobody noticed the bug, since the bit is always enabled anyway (e.g. pfault). Signed-off-by:
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Martin Schwidefsky authored
The novx parameter disables the vector facility but the HWCAP_S390_VXRS bit in the ELf hardware capabilies is always set if the machine has the vector facility. If the user space program uses the "vx" string in the features field of /proc/cpuinfo to utilize vector instruction it will crash if the novx kernel paramter is set. Convert setup_hwcaps to an arch_initcall and use MACHINE_HAS_VX to decide if the HWCAPS_S390_VXRS bit needs to be set. Cc: stable@vger.kernel.org # 3.18+ Reported-by:
Ulrich Weigand <uweigand@de.ibm.com> Reviewed-by:
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Heiko Carstens authored
get_user() and put_user() are inline functions in the meantime again. Both will generate the mvcos instruction if compiled with -march=z10 (or greater). The kernel parameter "uaccess_primary" can only change the behavior of out-of-line uaccess functions like copy_from_user() to not use the mvcos instruction, but not for the above named inlined functions. Therefore it is quite useless and the parameter can be removed. Signed-off-by:
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Heiko Carstens authored
Remove two more statements which always evaluate to 'false'. These are more leftovers from the 31 bit era. Signed-off-by:
David Hildenbrand <dahi@linux.vnet.ibm.com> Signed-off-by:
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Heiko Carstens authored
Remove the two facility bits 50 - constrained transactional-execution facility 74 - transactional-execution facility from the required facilities if the kernel is built with -march=zEC12. E.g. z/VM 6.3 doesn't virtualize the TX facility yet. Therefore a kernel built with -march=zEC12 and ipl'ed on a zEC12 machine as a z/VM 6.3 guest will emit a message about the missing facilities and stop working. The kernel however doesn't make use of the TX facility, therefore remove the two TX related facility bits and fix this unpleasant behavior. Signed-off-by:
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Michael Holzheu authored
By accident this level has been removed by the NUMA infrastructure patch. For non-NUMA systems with CPUs that span more than one book, this makes the scheduler only use one of the books and the other books remain idle. Fix this and re-add the missing level. For NUMA and non-NUMA we have the following scheduling domains and groups: - SMT (Groups: CPU threads) - MC (Groups: Cores) - BOOK (Groups: Books) For the non-NUMA case we have one last level scheduling domain: - DIE (Groups: Whole system, has all CPUs -> cpu_cpu_mask) For the NUMA case we have the following two last level scheduling domains: - DIE (Groups: NUMA nodes -> cpu_cpu_mask -> returns node siblings) - NUMA (Groups: Whole system, has all CPUs -> created in sched_init_numa()) Fixes: e8054b65 ("s390/numa: add topology tree infrastructure") Reported-and-tested-by:
Evgeny Cherkashin <Eugene.Crosser@ru.ibm.com> Signed-off-by:
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- 09 Aug, 2015 2 commits
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Stefan Haberland authored
This patch adds an enhanced detection for control unit initiated reconfiguration request scope. The first approach assumed the scope of the reconfiguration request to be restricted to the path on which the message was received. The enhanced approach determines the full scope of the reconfiguration request by evaluating additional path and device selection information contained in the reconfiguration message. Reviewed-by:
Stefan Haberland <stefan.haberland@de.ibm.com> Signed-off-by:
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Stefan Haberland authored
DASD path verification requires the usage of sleep_on_immediatly to ensure that no other I/O request is blocking the recovery of disconnected devices. But two concurrent path verification workers for the same device may kill each others requests due to the usage of the immediate sleep_on function. This may lead to unsuccessful path verifications. Prevent that two parallel path verification workers conflict with each other by implementing a device flag signalling a already running worker. Signed-off-by:
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- 07 Aug, 2015 6 commits
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Martin Schwidefsky authored
As proposed by Andy Lutomirski create the SysV and the GNU hash for the vdso objects. This may make some dynamic loaders a bit faster. Signed-off-by: -
Michael Holzheu authored
The core to node mapping data consumes about 2 KB bss data. To save memory for the non-NUMA case, make the data dynamic. In addition change the "core_to_node" array from "int" to "s32" which saves 1 KB also for the NUMA case. Suggested-by:
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Guenter Roeck authored
__delay is exported by most architectures, and may be used in modules. Since it is not exported for s390, s390:allmodconfig currently fails to build with ERROR: "__delay" [drivers/net/phy/mdio-octeon.ko] undefined! Fixes: a6d67864 ("net: mdio-octeon: Modify driver to work on both ThunderX and Octeon") Cc: Radha Mohan Chintakuntla <rchintakuntla@cavium.com> Cc: David Daney <david.daney@cavium.com> Signed-off-by:
Guenter Roeck <linux@roeck-us.net> Signed-off-by:
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Peter Senna Tschudin authored
This patch remove unneeded variables used to store return values. These issues were detected with the Coccinelle script: scripts/coccinelle/misc/returnvar.cocci [heiko.carstens@de.ibm.com]: make qeth_l[2/3]_stop() return void Signed-off-by:
Peter Senna Tschudin <peter.senna@gmail.com> Signed-off-by:
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Peter Senna Tschudin authored
Remove unneeded semicolon. The semantic patch that detects this change is available at scripts/coccinelle/misc/semicolon.cocci. Signed-off-by:
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Michael Holzheu authored
Since we are already protected by the "sched_domains_mutex" lock, we can safely remove the topology lock. Reviewed-by:
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- 04 Aug, 2015 4 commits
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Martin Schwidefsky authored
The MT scaling values are updated on each calll to do_account_vtime. This function is called for each HZ interrupt and for each context switch. Context switch can happen often, the STCCTM instruction on this path is noticeable. Limit the updates to once per jiffy. Signed-off-by: -
Heiko Carstens authored
x86 will wire up all syscalls reachable via sys_socketcall. Therefore this will yield a lot of warnings from the checksyscalls.sh scripts on s390 where we currently don't wire them up directly. This might change in the future, but this needs to be done carefully in order to not break anything. For the time being just tell the checksyscalls script to ignore the missing syscalls on s390. Signed-off-by:
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Philipp Hachtmann authored
Signed-off-by:
Philipp Hachtmann <phacht@linux.vnet.ibm.com> Signed-off-by:
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Michael Holzheu authored
NUMA emulation (aka fake NUMA) distributes the available memory to nodes without using real topology information about the physical memory of the machine. Splitting the system memory into nodes replicates the memory management structures for each node. Particularly each node has its own "mm locks" and its own "kswapd" task. For large systems, under certain conditions, this results in improved system performance and/or latency based on reduced pressure on the mm locks and the kswapd tasks. NUMA emulation distributes CPUs to nodes while respecting the original machine topology information. This is done by trying to avoid to separate CPUs which reside on the same book or even on the same MC. Because the current Linux scheduler code requires a stable cpu to node mapping, cores are pinned to nodes when the first CPU thread is set online. This patch is based on the initial implementation from Philipp Hachtmann. Signed-off-by:
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- 03 Aug, 2015 7 commits
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Philipp Hachtmann authored
NUMA emulation needs proper means to mangle the book/mc/core topology of the machine. The topology tree (toptree) consistently maintains cpu masks for the root, each node, and all leaves of the tree while the user may use the toptree functions to rearrange the tree in various ways. This patch contains several changes from Michael Holzheu. Signed-off-by:
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Philipp Hachtmann authored
Enable core NUMA support for s390 and add one simple default mode "plain" that creates one single NUMA node. This patch contains several changes from Michael Holzheu. Signed-off-by:
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Gerald Schaefer authored
With NUMA support for s390, arch_add_memory() needs to respect the nid parameter. Signed-off-by:
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Gerald Schaefer authored
Force get_user_page() to take the slow path for NUMA migration pages. Signed-off-by:
Gerald Schaefer <geraldsc@linux.vnet.ibm.com> Signed-off-by:
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Martin Schwidefsky authored
Define pte_protnone and pmd_protnone for NUMA memory migration. Signed-off-by: -
Christian Borntraeger authored
Right now we use the address of the sie control block as tag for the sampling data. This is hard to get for users. Let's just use the PID of the cpu thread to mark the hardware samples. Reviewed-by:
Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by:
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Hendrik Brueckner authored
All calls to save_fpu_regs() specify the fpu structure of the current task pointer as parameter. The task pointer of the current task can also be retrieved from the CPU lowcore directly. Remove the parameter definition, load the __LC_CURRENT task pointer from the CPU lowcore, and rebase the FPU structure onto the task structure. Apply the same approach for the load_fpu_regs() function. Reviewed-by:
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- 29 Jul, 2015 5 commits
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Sebastian Ott authored
Make sure that we use the pci_rescan_remove_lock when we remove or add functions from/to the bus. Reviewed-by:
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Sebastian Ott authored
Receiving error events for a pci function that's currently not in use will crash the kernel. For example the procedure for FW upgrades might include: * remove the function from Linux * apply FW upgrade * rescan for new functions Receiving an event during the FW upgrade will result in a use after free when printing the functions name. Just print "n/a" in such cases. Reviewed-by:
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Sebastian Ott authored
Free bus resources when the allocation/registration of the bus failed. Reviewed-by:
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Heiko Carstens authored
The public mailing lists and personal email addresses are sufficient. No need for an extra generic email address. Cc: Christian Borntraeger <borntraeger@de.ibm.com> Acked-by:
Cornelia Huck <cornelia.huck@de.ibm.com> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Ursula Braun <ursula.braun@de.ibm.com> Cc: Ingo Tuchscherer <ingo.tuchscherer@de.ibm.com> Cc: Steffen Maier <maier@linux.vnet.ibm.com> Signed-off-by:
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Heiko Carstens authored
Section mismatch in reference from the function __smp_store_cpu_state() to the function .init.text:memblock_alloc() The function __smp_store_cpu_state() references the function __init memblock_alloc(). Reviewed-by:
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