- 30 Jan, 2015 1 commit
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Heiko Carstens authored
With SMT we can have more than 256 CPUs. Let's make them available. Signed-off-by:
Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by:
Martin Schwidefsky <schwidefsky@de.ibm.com>
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- 29 Jan, 2015 9 commits
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Heiko Carstens authored
Use a brcl 0,2 instruction for jump label nops during compile time, so we don't mix up the different nops during mcount/hotpatch call site detection. The initial jump label code instruction replacement will exchange these instructions with either a branch or a brcl 0,0 instruction. Signed-off-by:
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Heiko Carstens authored
Add sanity checks to verify that only expected code will be replaced. If the code patterns do not match print the code patterns and panic, since something went terribly wrong. Signed-off-by:
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Hendrik Brueckner authored
Signed-off-by:
Hendrik Brueckner <brueckner@linux.vnet.ibm.com> Signed-off-by:
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Sebastian Ott authored
The dasd driver has a lot of duplicated code to handle dasd_global_profile. With this patch we use the same code for the global and the per device profiling data. Note that dasd_stats_write had to change slightly to maintain some odd differences between A) per device and global profile and B) proc and sysfs interface usage. Signed-off-by:
Sebastian Ott <sebott@linux.vnet.ibm.com> Reviewed-by:
Stefan Haberland <stefan.haberland@de.ibm.com> Signed-off-by:
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Sebastian Ott authored
Access to DASDs global statistics is done without locking which can lead to inconsistent data. Add locking to fix this. Also move the relevant structs in a global dasd_profile struct. Signed-off-by:
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Heiko Carstens authored
Make use of gcc's hotpatch support to generate better code for ftrace function tracing. The generated code now contains only a six byte nop in each function prologue instead of a 24 byte code block which will be runtime patched to support function tracing. With the new code generation the runtime overhead for supporting function tracing is close to zero, while the original code did show a significant performance impact. Acked-by:
Steven Rostedt <rostedt@goodmis.org> Signed-off-by:
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Heiko Carstens authored
gcc supports an s390 specific function attribute called "hotpatch". It can be used to specify the number of halfwords that shall be added before and after a function and which shall be filled with nops for runtime patching. s390 will use the hotpatch attribute for function tracing, therefore make sure that the notrace function attribute either disables the mcount call or in case of hotpatch nop generation. Acked-by:
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Heiko Carstens authored
If the kernel is compiled with function tracer support the -pg compile option is passed to gcc to generate extra code into the prologue of each function. This patch replaces the "open-coded" -pg compile flag with a CC_FLAGS_FTRACE makefile variable which architectures can override if a different option should be used for code generation. Acked-by:
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Heiko Carstens authored
Christian Borntraeger reported that the now missing diag 44 calls (voluntary time slice end) does cause a performance regression for stop_machine() calls if a machine has more virtual cpus than the host has physical cpus. This patch mainly reverts 57f2ffe1 ("s390: remove diag 44 calls from cpu_relax()") with the exception that we still do not issue diag 44 calls if running with smt enabled. Due to group scheduling algorithms when running in LPAR this would lead to significant latencies. However, when running in LPAR we do not have more virtual than physical cpus. Reported-and-tested-by:
Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by:
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- 23 Jan, 2015 3 commits
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Ingo Tuchscherer authored
Extends the generic cryptographic device driver (zcrypt) to support the Crypto Express 5S adapter. Signed-off-by:
Ingo Tuchscherer <ingo.tuchscherer@de.ibm.com> Signed-off-by:
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Ingo Tuchscherer authored
Upcoming versions of secure key management facilities (CCA and EP11) require information about the maximum number of supported ap domains in order to service TKE requests properly. With IBM z13 the number of available domains (so far 16) has increased up to 85. This number varies depending on machine types and models. Therefore the new sysfs attribute 'ap_max_domain_id' provides this limit of supported ap domains. Upcoming releases for CCA and EP11 will use this new information. Without this problem fix it is not possible to retrieve reliable information about the maximum number of supported ap domains. Thus, customers are not able to perform key management for CCA and EP11 coprocessor adapters. Signed-off-by:
Harald Freudenberger <freude@linux.vnet.ibm.com> Signed-off-by:
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Martin Schwidefsky authored
Add the compare-and-delay instruction to the spin-lock and rw-lock retry loops. A CPU executing the compare-and-delay instruction stops until the lock value has changed. This is done to make the locking code for contended locks to behave better in regard to the multi- hreading facility. A thread of a core executing a compare-and-delay will allow the other threads of a core to get a larger share of the core resources. Signed-off-by:
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- 22 Jan, 2015 9 commits
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Martin Schwidefsky authored
The unit check handler for 3480 / 3490 tapes used to print a different warning message for erpa code 0x57 dependent on the device type. The warning messages have been remove in a cleanup, the if statement is a left over. Remove it. Reported-by:
Fraser Brown <mlfbrown@stanford.edu> Signed-off-by:
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Hendrik Brueckner authored
Introduce a wildcard character to filter a range of z/VM user IDs with a single filter entry. Only the leading portion up to the wildcard of an filter entry contributes to the match. This reduces the filter size and avoids configuration updates when deploying new terminal server instances. Signed-off-by:
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Christophe Jaillet authored
Free allocated page in case of error returned by hmcdrv_ftp_startup. [heiko.carstens@de.ibm.com]: slightly changed Christophe's patch Signed-off-by:
Christophe Jaillet <christophe.jaillet@wanadoo.fr> Signed-off-by:
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Martin Schwidefsky authored
Signed-off-by: -
Paul Bolle authored
Commit 725908110a1f ("s390: add SMT support") added a check for CONFIG_ZFCPDUMP. But the Kconfig symbol ZFCPDUMP was removed in v3.16 through commit bf28a597 ("s390/dump: Remove CONFIG_ZFCPDUMP"). So this check will always evaluate to false. No one noticed probably because the code also checks for CONFIG_CRASH_DUMP which "also enables s390 zfcpdump". Dump the unneeded check. Signed-off-by:Paul Bolle <pebolle@tiscali.nl> Signed-off-by:
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Gerald Schaefer authored
The content of a DCSS of type SN or EN cannot be saved. Issue a warning when trying to save such a DCSS. Depending on the setup, this may be a user error or intended behaviour e.g. with a multi-DCSS device. Signed-off-by:
Gerald Schaefer <gerald.schaefer@de.ibm.com> Signed-off-by:
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Martin Schwidefsky authored
The multi-threading facility is introduced with the z13 processor family. This patch adds code to detect the multi-threading facility. With the facility enabled each core will surface multiple hardware threads to the system. Each hardware threads looks like a normal CPU to the operating system with all its registers and properties. The SCLP interface reports the SMT topology indirectly via the maximum thread id. Each reported CPU in the result of a read-scp-information is a core representing a number of hardware threads. To reflect the reduced CPU capacity if two hardware threads run on a single core the MT utilization counter set is used to normalize the raw cputime obtained by the CPU timer deltas. This scaled cputime is reported via the taskstats interface. The normal /proc/stat numbers are based on the raw cputime and are not affected by the normalization. Signed-off-by: -
Martin Schwidefsky authored
Avoid cache aliasing on z13 by aligning shared objects to multiples of 512K. The virtual addresses of a page from a shared file needs to have identical bits in the range 2^12 to 2^18. Signed-off-by: -
Martin Schwidefsky authored
Allow to generate code that only runs on z13 machines. Signed-off-by:
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- 15 Jan, 2015 3 commits
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Syam Sidhardhan authored
version.h inclusion is not necessary as detected by versioncheck. Signed-off-by:
Syam Sidhardhan <s.syam@samsung.com> Signed-off-by:
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Thomas Huth authored
The section about debugging scripting languages has nothing to do with s390 (and the example is even apparently taken from a i586 host instead), so let's remove this chapter from the file. Signed-off-by:
Thomas Huth <thuth@linux.vnet.ibm.com> Signed-off-by:
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Thomas Huth authored
There are a lot of lines that are longer than 80 columns in this file, rendering it hard to read in a terminal window. This patch fixes most of these long lines, and while we're at it, also makes some sentences more readable, e.g. by replacing "&" with "and", adding proper punctuation, removing superfluous clauses, etc. Signed-off-by:
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- 08 Jan, 2015 13 commits
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Sudeep Holla authored
This patch removes the redundant sysfs cacheinfo code by reusing the newly introduced generic cacheinfo infrastructure through the commit 246246cb ("drivers: base: support cpu cache information interface to userspace via sysfs") Signed-off-by:
Sudeep Holla <sudeep.holla@arm.com> Signed-off-by:
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Chen Gang authored
In aes_encrypt() and aes_decrypt(), need let 'sctx->key' be modified, so remove 'const' for it. The related warnings: CC [M] arch/s390/crypto/aes_s390.o arch/s390/crypto/aes_s390.c: In function 'aes_encrypt': arch/s390/crypto/aes_s390.c:146:37: warning: passing argument 2 of 'crypt_s390_km' discards 'const' qualifier from pointer target type [-Wdiscarded-array-qualifiers] crypt_s390_km(KM_AES_128_ENCRYPT, &sctx->key, out, in, ^ ... In file included from arch/s390/crypto/aes_s390.c:29:0: arch/s390/crypto/crypt_s390.h:154:19: note: expected 'void *' but argument is of type 'const u8 (*)[32] {aka const unsigned char (*)[32]}' static inline int crypt_s390_km(long func, void *param, ^ Signed-off-by:Chen Gang <gang.chen.5i5j@gmail.com> Signed-off-by:
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Joe Perches authored
This has no effect as KERN_CONT is an empty string, It's probably just a missing conversion artifact as the other pr_cont uses in the same file don't have this prefix. Signed-off-by:
Joe Perches <joe@perches.com> Signed-off-by:
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Heiko Carstens authored
_sclp_print_early() has a return value, but misses to sign extend it if called from 64 bit code. This is not really a bug, since currently no caller cares what the return value is. Signed-off-by:
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Chen Gang authored
_sclp_print_early() has return value: at present, return 0 for OK, 1 for failure. It returns '%r2', so use 'long' as return value (upper caller can check '%r2' directly). The related warning: CC arch/s390/boot/compressed/misc.o arch/s390/boot/compressed/misc.c:66:8: warning: type defaults to 'int' in declaration of '_sclp_print_early' [-Wimplicit-int] extern _sclp_print_early(const char *); ^ At present, _sclp_print_early() is only used by puts(), so can still remain its declaration in 'misc.c' file. [heiko.carstens@de.ibm.com]: move declaration to sclp.h header file Signed-off-by: -
Heiko Carstens authored
Signed-off-by:
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Rickard Strandqvist authored
Removes some functions that are not used anywhere: idset_clear() idset_sch_get_first() This was partially found by using a static code analysis program called cppcheck. Signed-off-by:
Rickard Strandqvist <rickard_strandqvist@spectrumdigital.se> Signed-off-by:
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Heiko Carstens authored
Get rid of sparse warnings like this one: arch/s390/kernel/signal.c:244:1: warning: symbol 'sys_sigreturn' was not declared. Should it be static? Signed-off-by: -
Heiko Carstens authored
Get rid of warnings like this one: warning: constant 0xffe0000000000000 is so big it is unsigned long Signed-off-by: -
Heiko Carstens authored
Remove one of the two identical initializer entries. Signed-off-by: -
Heiko Carstens authored
Signed-off-by: -
Heiko Carstens authored
Always verify that the to be replaced code matches what we expect to see. Signed-off-by:
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Martin Schwidefsky authored
pmd_to_page() is only available if USE_SPLIT_PMD_PTLOCKS is defined. The use of pmd_to_page in the gmap code can cause compile errors if NR_CPUS is smaller than SPLIT_PTLOCK_CPUS. Do not use pmd_to_page outside of USE_SPLIT_PMD_PTLOCKS sections. Reported-by:
Mike Frysinger <vapier@gentoo.org> Signed-off-by:
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- 07 Jan, 2015 1 commit
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Chen Gang authored
For C language, it treats array parameter as a pointer, so sizeof for an array parameter is equal to sizeof for a pointer, which causes compiler warning (with allmodconfig by gcc 5): ./arch/s390/include/asm/timex.h: In function 'get_tod_clock_ext': ./arch/s390/include/asm/timex.h:76:32: warning: 'sizeof' on array function parameter 'clk' will return size of 'char *' [-Wsizeof-array-argument] typedef struct { char _[sizeof(clk)]; } addrtype; ^ Can use macro CLOCK_STORE_SIZE instead of all related hard code numbers, which also can avoid this warning. And also add a tab to CLOCK_TICK_RATE definition to match coding styles. [heiko.carstens@de.ibm.com]: Chen's patch actually fixes a bug within the get_tod_clock_ext() inline assembly where we incorrectly tell the compiler that only 8 bytes of memory get changed instead of 16 bytes. This would allow gcc to generate incorrect code. Right now this doesn't seem to be the case. Also slightly changed the patch a bit. - renamed CLOCK_STORE_SIZE to STORE_CLOCK_EXT_SIZE - changed get_tod_clock_ext() to receive a char pointer parameter Signed-off-by:
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- 18 Dec, 2014 1 commit
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Heiko Carstens authored
Signed-off-by:
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