d59b93da5e572703e1a7311c13dd3472a4e56e30 |
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19-Sep-2014 |
Martin Schwidefsky <schwidefsky@de.ibm.com> |
s390/rwlock: use directed yield for write-locked rwlocks Add an owner field to the arch_rwlock_t to be able to pass the timeslice of a virtual CPU with diagnose 0x9c to the lock owner in case the rwlock is write-locked. The undirected yield in case the rwlock is acquired writable but the lock is read-locked is removed. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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f4192bf2dc5ae3b24ffb004e771397e737ef01e0 |
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15-Apr-2014 |
Michael Holzheu <holzheu@linux.vnet.ibm.com> |
s390/smp: Avoid busy loop after halt and "begin" on z/VM Currently the smp_stop_cpu() function for SMP kernels enters a busy loop when "begin" is entered on the z/VM console after Linux is halted. To avoid this behavior, use the non-SMP variant of smp_stop_cpu() which stops the CPU again after "begin" is entered. As a side effect we now have consistent behavior for SMP and non-SMP Linux. Signed-off-by: Michael Holzheu <holzheu@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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e7c46c66dbd1727f7de52f54c4acefb692b24f37 |
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04-Apr-2014 |
Heiko Carstens <heiko.carstens@de.ibm.com> |
s390/smp: fix smp_stop_cpu() for !CONFIG_SMP smp_stop_cpu() should stop the current cpu even for !CONFIG_SMP. Otherwise machine_halt() will return and and the machine generates a panic instread of simply stopping the current cpu: Kernel panic - not syncing: Attempted to kill init! exitcode=0x00000000 CPU: 0 PID: 1 Comm: systemd-shutdow Not tainted 3.14.0-01527-g2b6ef16a6bc5 #10 [...] Call Trace: ([<0000000000110db0>] show_trace+0xf8/0x158) [<0000000000110e7a>] show_stack+0x6a/0xe8 [<000000000074dba8>] panic+0xe4/0x268 [<0000000000140570>] do_exit+0xa88/0xb2c [<000000000016e12c>] SyS_reboot+0x1f0/0x234 [<000000000075da70>] sysc_nr_ok+0x22/0x28 [<000000007d5a09b4>] 0x7d5a09b4 Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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d80512f87474f2dfd67ef931737659acce20fe69 |
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16-Dec-2013 |
Heiko Carstens <heiko.carstens@de.ibm.com> |
s390/smp: improve setup of possible cpu mask Since under z/VM we cannot have more than 64 cpus, make sure the cpu_possible_mask does not contain more bits. This avoids wasting memory for dynamic per-cpu allocations if CONFIG_NR_CPUS is larger than 64. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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5895294274bee046bcfdbb72f8998e2b14e26426 |
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11-Oct-2013 |
Michael Holzheu <holzheu@linux.vnet.ibm.com> |
s390: Remove zfcpdump NR_CPUS dependency Currently zfpcdump can only collect registers for up to CONFIG_NR_CPUS CPUss. This dependency is not necessary. So remove it by dynamically allocating the save area array. Signed-off-by: Michael Holzheu <holzheu@linux.vnet.ibm.com> Reviewed-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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50ab9a9a60fc83b8e8db36b54f365226e2b139ac |
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04-Sep-2012 |
Heiko Carstens <heiko.carstens@de.ibm.com> |
s390/smp,topology: add polarization member to pcpu struct The cpu polarization member is the only per cpu state that is not part of the pcpu structure. So add it there and have everything in one place. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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0d0e471b46d4ba1de4617d04cf071c6ae4a5df76 |
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27-Aug-2012 |
Heiko Carstens <heiko.carstens@de.ibm.com> |
s390/smp: fix smp_find_processor_id() argument mismatch For SMP and !SMP smp_find_processor_id() either takes a u16 or an unsigned int argument. Fix this so both versions take a u16. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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29a877fa1f402ce2c1a0c52957c4e29b9bb34216 |
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27-Aug-2012 |
Heiko Carstens <heiko.carstens@de.ibm.com> |
s390/smp: add missing smp_store_status() for !SMP Fix this compile error: arch/s390/kernel/machine_kexec.c: In function ‘setup_regs’: arch/s390/kernel/machine_kexec.c:63:3: error: implicit declaration of function ‘smp_store_status’ [-Werror=implicit-function-declaration] Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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a53c8fab3f87c995c30ac226a03af95361243144 |
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20-Jul-2012 |
Heiko Carstens <heiko.carstens@de.ibm.com> |
s390/comments: unify copyright messages and remove file names Remove the file name from the comment at top of many files. In most cases the file name was wrong anyway, so it's rather pointless. Also unify the IBM copyright statement. We did have a lot of sightly different statements and wanted to change them one after another whenever a file gets touched. However that never happened. Instead people start to take the old/"wrong" statements to use as a template for new files. So unify all of them in one go. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
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8239c25f47d2b318156993b15f33900a86ea5e17 |
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20-Apr-2012 |
Thomas Gleixner <tglx@linutronix.de> |
smp: Add task_struct argument to __cpu_up() Preparatory patch to make the idle thread allocation for secondary cpus generic. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Rusty Russell <rusty@rustcorp.com.au> Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com> Cc: Matt Turner <mattst88@gmail.com> Cc: Russell King <linux@arm.linux.org.uk> Cc: Mike Frysinger <vapier@gentoo.org> Cc: Jesper Nilsson <jesper.nilsson@axis.com> Cc: Richard Kuo <rkuo@codeaurora.org> Cc: Tony Luck <tony.luck@intel.com> Cc: Hirokazu Takata <takata@linux-m32r.org> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: David Howells <dhowells@redhat.com> Cc: James E.J. Bottomley <jejb@parisc-linux.org> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Paul Mundt <lethal@linux-sh.org> Cc: David S. Miller <davem@davemloft.net> Cc: Chris Metcalf <cmetcalf@tilera.com> Cc: Richard Weinberger <richard@nod.at> Cc: x86@kernel.org Link: http://lkml.kernel.org/r/20120420124556.964170564@linutronix.de
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a0616cdebcfd575dcd4c46102d1b52fbb827fc29 |
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28-Mar-2012 |
David Howells <dhowells@redhat.com> |
Disintegrate asm/system.h for S390 Disintegrate asm/system.h for S390. Signed-off-by: David Howells <dhowells@redhat.com> cc: linux-s390@vger.kernel.org
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8b646bd759086f6090fe27acf414c0b5faa737f4 |
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11-Mar-2012 |
Martin Schwidefsky <schwidefsky@de.ibm.com> |
[S390] rework smp code Define struct pcpu and merge some of the NR_CPUS arrays into it, including __cpu_logical_map, current_set and smp_cpu_state. Split smp related functions to those operating on physical cpus and the functions operating on a logical cpu number. Make the functions for physical cpus use a pointer to a struct pcpu. This hides the knowledge about cpu addresses in smp.c, entry[64].S and swsusp_asm64.S, thus remove the sigp.h header. The PSW restart mechanism is used to start secondary cpus, calling a function on an online cpu, calling a function on the ipl cpu, and for the nmi signal. Replace the different assembler functions with a single function restart_int_handler. The new entry point calls a function whose pointer is stored in the lowcore of the target cpu and it can wait for the source cpu to stop. This covers all existing use cases. Overall the code is now simpler and there are ~380 lines less code. Reviewed-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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83a24e32908476c33ea9abc132c73020e2cd3620 |
|
27-Dec-2011 |
Heiko Carstens <heiko.carstens@de.ibm.com> |
[S390] topology: get rid of ifdefs Remove all ifdefs from topology code and also only compile it for the CONFIG_SCHED_BOOK case. The new code selects SCHED_MC if SCHED_BOOK is selected. SCHED_MC without SCHED_BOOK is not possible anymore. Furthermore various sysfs attributes are not available anymore for the !SCHED_BOOK case. In particular all attributes that correspond to CPU polarization. But since all real world kernels have SCHED_BOOK selected anyway this doesn't matter too much. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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1943f53c9ca182fa233e5a17e89ef8e421d7819e |
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30-Oct-2011 |
Michael Holzheu <holzheu@linux.vnet.ibm.com> |
[S390] Force PSW restart on online CPU PSW restart can be triggered on offline CPUs. If this happens, currently the PSW restart code fails, because functions like smp_processor_id() do not work on offline CPUs. This patch fixes this as follows: If PSW restart is triggered on an offline CPU, the PSW restart (sigp restart) is done a second time on another CPU that is online and the old CPU is stopped afterwards. Signed-off-by: Michael Holzheu <holzheu@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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da7f51c11d5fedca9ba779ee220063ccb4f0a27e |
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05-Jan-2011 |
Heiko Carstens <heiko.carstens@de.ibm.com> |
[S390] smp/idle: call init_idle() before starting a new cpu Call init_idle() which (re-)initializes the idle task structure before it gets used on a new cpu. That way we can also get rid of the odd preempt_enable_no_resched() call we have in the cpu offline path within cpu_idle(). That call prevented preempt count imbalances between cpu hotplug operations. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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59b697874529f5c3cbcaf5816b3d6c584af521e8 |
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26-Feb-2010 |
Gerald Schaefer <gerald.schaefer@de.ibm.com> |
[S390] spinlock: check virtual cpu running status This patch introduces a new function that checks the running status of a cpu in a hypervisor. This status is not virtualized, so the check is only correct if running in an LPAR. On acquiring a spinlock, if the cpu holding the lock is scheduled by the hypervisor, we do a busy wait on the lock. If it is not scheduled, we yield over to that cpu. Signed-off-by: Gerald Schaefer <gerald.schaefer@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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2c2df118a6440748e6fd71a510a66ee708c31494 |
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26-Feb-2010 |
Heiko Carstens <heiko.carstens@de.ibm.com> |
[S390] smp: always reboot on cpu 0 Always reboot on logical cpu 0. This makes sure that the IPL cpu is always the same and usually avoids strange numbering schemes between physical and logical cpus. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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f64ca21714f114a78b6c19ceabc7745b29913efc |
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26-Feb-2010 |
Heiko Carstens <heiko.carstens@de.ibm.com> |
[S390] zfcpdump: remove cross arch dump support Remove support to be able to dump 31 bit systems with a 64 bit dumper. This is mostly useless since no distro ships 31 bit kernels together with a 64 bit dumper. We also get rid of a bit of hacky code. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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c20c89a692872a4090b1004e6554fdc282baf72f |
|
07-Dec-2009 |
Heiko Carstens <heiko.carstens@de.ibm.com> |
[S390] smp: remove unused typedef and defines Remove unused typedef, defines, update copyright, remove unneeded includes, remove unneeded ifdefs. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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0748bd01773395003208996c4c0b3f80caf80976 |
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24-Sep-2009 |
Rusty Russell <rusty@rustcorp.com.au> |
cpumask: remove arch_send_call_function_ipi Now everyone is converted to arch_send_call_function_ipi_mask, remove the shim and the #defines. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
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630cd0460724e286d3c5cb2c33930b0ae9cd6645 |
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24-Sep-2009 |
Rusty Russell <rusty@rustcorp.com.au> |
cpumask: arch_send_call_function_ipi_mask: s390 We're weaning the core code off handing cpumask's around on-stack. This introduces arch_send_call_function_ipi_mask(). Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
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5c0b912e755caaad555eb6feefdb1124462d8f37 |
|
11-Sep-2009 |
Heiko Carstens <heiko.carstens@de.ibm.com> |
[S390] Remove smp_cpu_not_running. smp_cpu_not_running() and cpu_stopped() are doing the same. Remove one and also get rid of the last hard_smp_processor_id() leftover. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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7b4684880dfc6c45bc56039ca5eada771d7643ab |
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26-Mar-2009 |
Martin Schwidefsky <schwidefsky@de.ibm.com> |
[S390] eliminate cpuinfo_S390 structure Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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70f454408e68fdba2c2529ab7d6ec3c3525e59f2 |
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20-Mar-2009 |
Heiko Carstens <heiko.carstens@de.ibm.com> |
s390: remove arch specific smp_send_stop() Impact: build fix on s390 !CONFIG_SMP Remove arch specific smp_send_stop for !CONFIG_SMP since it conflicts with a new generic version. Reported-by: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> LKML-Reference: <20090320092410.30d2bac3@osiris.boeblingen.de.ibm.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
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ca9fc75a68ee98812bb6d212405fea039421910b |
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25-Dec-2008 |
Heiko Carstens <heiko.carstens@de.ibm.com> |
[S390] convert s390 to generic IPI infrastructure Since etr/stp don't need the old smp_call_function semantics anymore we can convert s390 to the generic IPI infrastructure. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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c6557e7f2b6ae76a44653d38f835174074c42e05 |
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01-Aug-2008 |
Martin Schwidefsky <schwidefsky@de.ibm.com> |
[S390] move include/asm-s390 to arch/s390/include/asm Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
|