- 11 Dec, 2012 2 commits
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Jan Glauber authored
Signed-off-by:
Jan Glauber <jang@linux.vnet.ibm.com> Signed-off-by:
Martin Schwidefsky <schwidefsky@de.ibm.com>
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Jan Glauber authored
Benefit from pci store block instruction by writing up to 128 bytes with a single instruction to MMIO space. Depending on the workload this can result in a huge performance increase due to the reduced number of instructions. The ordering guarantees of single stores vs. one store block are identical. Signed-off-by:
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- 05 Dec, 2012 2 commits
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Jan Glauber authored
The DMA API allows to avoid DMA unmaps because they are NOPs on some plattforms. But not on s390, so force them. Signed-off-by:
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Jan Glauber authored
The PCI instructions may be used in IRQ context so scheduling is forbidden. Use udelay and shorten the delay since we are now polling. Signed-off-by:
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- 03 Dec, 2012 5 commits
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Wei Yongjun authored
The dereference to 'zdev' should be moved below the NULL test. Signed-off-by:
Wei Yongjun <yongjun_wei@trendmicro.com.cn> Signed-off-by:
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Wei Yongjun authored
Using kmem_cache_zalloc() instead of kmem_cache_alloc() and memset(). Signed-off-by:
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Heiko Carstens authored
Add support for XOR instruction for use with X/K. s390 JIT support for the new BPF_S_ALU_XOR_* instructions introduced with 9e49e889 "filter: add XOR instruction for use with X/K". Signed-off-by:
Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by:
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Heiko Carstens authored
Add support for MOD operation for s390's JIT. Same as 280050cc "x86 bpf_jit: support MOD operation" for x86 which adds JIT support for the generic new MOD operation introduced with b6069a95 "filter: add MOD operation". Signed-off-by:
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Sebastian Ott authored
The check to whom a device is reserved is done by checking the path state of the affected channel paths. If it turns out that one path is flagged as reserved by someone else the whole device is marked as such. However the meaning of the RESVD_ELSE bit is that the addressed device is reserved to a different pathgroup (and not reserved to a different LPAR). If we do this test on a path which is currently not a member of the pathgroup we could erroneously mark the device as reserved to someone else. To fix this collect the reserved state for all potential members of the pathgroup and only mark the device as reserved if all of those potential members have the RESVD_ELSE bit set. Cc: stable@vger.kernel.org Acked-by:
Peter Oberparleiter <peter.oberparleiter@de.ibm.com> Signed-off-by:
Sebastian Ott <sebott@linux.vnet.ibm.com> Signed-off-by:
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- 30 Nov, 2012 12 commits
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Jan Glauber authored
Signed-off-by:
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Jan Glauber authored
CONFIG_PCI is disabled by default currently. Signed-off-by:
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Jan Glauber authored
Add some s390 specific sysfs attributes to the PCI device directory. The following attributes are introduced: - function_id (PCI function ID) - function_handle (PCI function handle) - pchid (PCI channel ID) - pfgid (PCI function group ID aka PCI root complex) Signed-off-by:
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Jan Glauber authored
Add SCLP PCI configure/deconfigure and implement a PCI hotplug controller (s390_pci_hpc). The hotplug controller creates a slot for every PCI function in stand-by or configured state. The PCI functions are named after the PCI function ID (fid). By writing to the power attribute in /sys/bus/pci/slots/<fid>/power the PCI function is moved to stand-by or configured state. If moved to the configured state the device is automatically scanned by the s390 PCI layer. Signed-off-by:
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Jan Glauber authored
Add CHSC store-event-information support for PCI (notfication type 2) and report error and availability events to the PCI architecture layer. Signed-off-by:
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Jan Glauber authored
Add DMA IOMMU support using 4K page table entries. Implement dma_map_ops. Signed-off-by:
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Jan Glauber authored
Support PCI adapter interrupts using the Single-IRQ-mode. Single-IRQ-mode disables an adapter IRQ automatically after delivering it until the SIC instruction enables it again. This is used to reduce the number of IRQs for streaming workloads. Up to 64 MSI handlers can be registered per PCI function. A hash table is used to map interrupt numbers to MSI descriptors. The interrupt vector is scanned using the flogr instruction. Only MSI/MSI-X interrupts are supported, no legacy INTs. Signed-off-by:
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Jan Glauber authored
The flogr instruction scans a bitmap starting from the leftmost bit. Implement support for these bitops. This could be useful to scan bitmaps like an interrupt vector set by the hardware starting at the leftmost bit. Signed-off-by:
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Jan Glauber authored
CLP instructions are used to query the firmware about detected PCI functions, the attributes of those functions and to enable or disable a PCI function. The CLP interface is the equivalent to a PCI bus scan. Signed-off-by:
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Jan Glauber authored
Add PCI support for s390, (only 64 bit mode is supported by hardware): - PCI facility tests - PCI instructions: pcilg, pcistg, pcistb, stpcifc, mpcifc, rpcit - map readb/w/l/q and writeb/w/l/q to pcilg and pcistg instructions - pci_iomap implementation - memcpy_fromio/toio - pci_root_ops using special pcilg/pcistg - device, bus and domain allocation Signed-off-by:
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Stefan Haberland authored
The regular behavior of the DASD device driver when setting a device offline is to return all outstanding I/O as failed. This behavior is different from that of other System z operating systems and may lead to unexpected data loss. Adding an explicit 'safe' offline function will allow customers to use DASDs in the way they expect them to work. Signed-off-by:
Stefan Haberland <stefan.haberland@de.ibm.com> Signed-off-by:
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Stefan Haberland authored
If a channel path is cabled incorrectly and the device is suspended and resumed the device may be inaccessible afterwards. Make the path connection check not interrupt the resume callback there could be other valid paths available. Signed-off-by:
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- 23 Nov, 2012 19 commits
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Sebastian Ott authored
Allow drivers to enable/disable ccwgroup devices. Acked-by:
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Sebastian Ott authored
Return -EINVAL if set_{on,off}line is called for already {on,off}line devices. Also return -EINVAL for drivers which do not provide a callback for set_{on,off}line. This behaviour is now consistent with the one for ccw devices. Reported-by:Stefan Raspl <raspl@linux.vnet.ibm.com> Signed-off-by:
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Christian Borntraeger authored
I was chasing down a bug of random validity intercepts on s390. (guest prefix page not mapped in the host virtual aspace). Turns out that the problem was a wrong address space control element. The cause was quite complex: During paging activity a DAT protection during SIE caused a program interrupt. Normally, the sie retry loop tries to catch all interrupts during and shortly before sie to rerun the setup. The problem is now that protection causes a suppressing program interrupt, causing the PSW to point to the instruction AFTER SIE in case of DAT protection. This confused the logic of the retry loop to not trigger, instead we jumped directly back to SIE after return from the program interrupt. (the protection fault handler itself did a rewind of the psw). This usually works quite well, but: If now the protection fault handler has to wait, another program might be scheduled in. Later on the sie process will be schedules in again. In that case the content of CR1 (primary address space) will be wrong because switch_to will put the user space ASCE into CR1 and not the guest ASCE. In addition the program parameter is also wrong for every protection fault of a guest, since we dont issue the SPP instruction. So lets also check for PSW == instruction after SIE in the program check handler. Instead of expensively checking all program interruption codes that might be suppressing we assume that a program interrupt pointing after SIE was always a program interrupt in SIE. (Otherwise we have a kernel bug anyway). We also have to compensate the rewinding, since the C-level handlers will do that. Therefore we need to add a nop with the same length as SIE before the sie_loop. Signed-off-by:
Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by:
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Martin Schwidefsky authored
The current single step code is racy in regard to concurrent delivery of signals. If a signal is delivered after a PER program check occurred but before the TIF_PER_TRAP bit has been checked in entry[64].S the code clears TIF_PER_TRAP and then calls do_signal. This is wrong, if the instruction completed (or has been suppressed) a SIGTRAP should be delivered to the debugger in any case. Only if the instruction has been nullified the SIGTRAP may not be send. The new logic always sets TIF_PER_TRAP if the program check indicates PER tracing but removes it again for all program checks that are nullifying. The effect is that for each change in the PSW address we now get a single SIGTRAP. Reported-by:
Andreas Arnez <arnez@linux.vnet.ibm.com> Signed-off-by:
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Heiko Carstens authored
Signed-off-by: -
Heiko Carstens authored
Allow to generate code that only runs on zEC12 machines. Also add a check which prevents the kernel to run on machines which do not have any of the following new facilities installed: - (48) decimal-floating-point zoned-conversion - (49) execution-hint - (49) load-and-trap - (49) miscellaneous-instruction-extensions - (49) processor-assist - (50) constrained transactional-execution - (73) transactional-execution 48, 49, 50 and 73 are the bit numbers of the facility indications for each of the required facilities. Note that we assume that user-space gets compiled with the same compiler options, therefore we also test for a dfp facility even if the kernel doesn't make use of it. Signed-off-by: -
Heiko Carstens authored
Mainly merge all different per-cpu arrays into a single array which holds all topology information per logical cpu. Also fix the broken core vs socket variable naming and simplify the locking a bit. When running in environments without topology information also invent book, socket and core ids, so that not all ids are zero. Signed-off-by:
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Heiko Carstens authored
Keep related functions together and move to appropriate file. Signed-off-by:
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Heiko Carstens authored
Move and rename init_storage_keys() to pageattr.c, so it can also be used from the sclp memory hotplug code in order to initialize storage keys. Signed-off-by:
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Ingo Tuchscherer authored
The message request handling (type50 - clear key) for RSA operations (in CRT format) are now handled correctly with respect to the crb format container. Signed-off-by:
Ingo Tuchscherer <ingo.tuchscherer@de.ibm.com> Signed-off-by:
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Heiko Carstens authored
Just convert fault_init() to an early initcall. That's still early enough since it only needs be called before user space processes get executed. No reason to externalize it. Also add the function to the init section and move the store_indication variable to the read_mostly section. Signed-off-by:
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Sebastian Ott authored
Let the dasd driver and qdio use ccw_device_get_schid and get rid of other similar functions. Signed-off-by:
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Cornelia Huck authored
This will be needed by the new virtio-ccw transport. Signed-off-by:
Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by:
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Jan Glauber authored
Remove the BUG_ON's that check for failure or incomplete results of the s390 hardware crypto instructions. Rather report the errors as -EIO to the crypto layer. Signed-off-by:
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Jan Glauber authored
Remove or replace BUG/BUG_ON where possible and convert WARN_ON to WARN_ON_ONCE if they can occur freqeuently as pointed out by: https://lkml.org/lkml/2012/9/27/461 Checks have been removed if: - the error condition leads to a hardware error which gets logged and in most cases stops the device - the error condition is a null pointer access - the error condition is just pointless or already handled at another location Signed-off-by:
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Sebastian Ott authored
Do not use more than one KERN_<level> per printk. Signed-off-by:
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Heiko Carstens authored
Preinitialize the program check table, so we can put it into the read-only data section. Also use only four byte entries for the table, since each program check handler resides within the first 2GB. Therefore this reduces the size of the table by 50% on 64 bit builds. Signed-off-by:
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Heiko Carstens authored
Use 1MB frames for vmemmap if EDAT1 is available in order to reduce TLB pressure Always use a 1MB frame even if its only partially needed for struct pages. Otherwise we would end up with a mix of large frame and page mappings, because vmemmap_populate gets called for each section (256MB -> 3.5MB memmap) separately. Worst case is that we would waste 512KB. Signed-off-by:
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Heiko Carstens authored
Use 2GB frames for indentity mapping if EDAT2 is available to reduce TLB pressure. Signed-off-by:
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