- 26 Apr, 2013 2 commits
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Martin Schwidefsky authored
Add a pointer to the system call table to the thread_info structure. The TIF_31BIT bit is set or cleared by SET_PERSONALITY exactly once for the lifetime of a process. With the pointer to the correct system call table in thread_info the system call code in entry64.S path can drop the check for TIF_31BIT which saves a couple of instructions. Signed-off-by:Martin Schwidefsky <schwidefsky@de.ibm.com>
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Martin Schwidefsky authored
Store the stack pointers in the lowcore for the kernel stack, the async stack and the panic stack with the offset required for the first user. This avoids an unnecessary add instruction on the system call path. Signed-off-by:
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- 23 Apr, 2013 9 commits
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Heiko Carstens authored
Kay Sievers reported that coreutils' stat tool has a problem with s390's statfs[64] definition: > The definition of struct statfs::f_type needs a fix. s390 is the only > architecture in the kernel that uses an int and expects magic > constants lager than INT_MAX to fit into. > > A fix is needed to make Fedora boot on s390, it currently fails to do > so. Userspace does not want to add code to paper-over this issue. [...] > Even coreutils cannot handle it: > #define RAMFS_MAGIC 0x858458f6 > # stat -f -c%t / > ffffffff858458f6 > > #define BTRFS_SUPER_MAGIC 0x9123683E > # stat -f -c%t /mnt > ffffffff9123683e The bug is caused by an implicit sign extension within the stat tool: out_uint_x (pformat, prefix_len, statfsbuf->f_type); where the format finally will be "%lx". A similar problem can be found in the 'tail' tool. s390 is the only architecture which has an int type f_type member in struct statfs[64]. Other architectures have either unsigned ints or long values, so that the problem doesn't occur there. Therefore change the type of the f_type member to unsigned int, so that we get zero extension instead of sign extension when assignment to a long value happens. This patch changes the s390 uapi struct stafs[64] definition in the kernel to contain only unsigned values. This was true for 32 bit builds anyway, since we use the generic uapi header file in that case. So lets not include conditionally the generic uapi header file but have the s390 implementation completely independent. Also fix the types of struct compat_stafs to match reality and move the definition of struct compat_statfs64 to asm/compat.h since it is not part of the api. Reported-by:
Kay Sievers <kay@vrfy.org> Signed-off-by:
Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by:
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Gerald Schaefer authored
For offset > PAGE_SIZE, s390_dma_map_pages() will issue a warning and return a wrong dma address. This patch removes the warning and fixes the dma return address calculation. Signed-off-by:
Gerald Schaefer <gerald.schaefer@de.ibm.com> Signed-off-by:
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Heiko Carstens authored
Signed-off-by:
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Heiko Carstens authored
The compat definitions are not part of the uapi. So move them to s390's private compat header file. Signed-off-by:
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Heiko Carstens authored
Fix this one for !COMPAT: compat.h: In function ‘arch_compat_alloc_user_space’: compat.h:292:2: error: implicit declaration of function ‘is_compat_task’ Signed-off-by:
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Heiko Carstens authored
The f_spare field within struct compat_statfs is four bytes larger than within the native 31 bit struct statfs. compat_sys_statfs() clears the f_spare field in user space which means that in compat mode four bytes that are behind the user space supplied struct compat_statfs will be corrupted (zeroed). According to Thomas Gleixner's Linux 2.6 history tree this bug is present since v2.5.74 87880da1 "[PATCH] s390: 31 bit compat.". So it get's fixed shortly before its 10th anniversary. Tough luck. Signed-off-by:
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Michael Holzheu authored
Currently always one page is copied to a user buffer for the last HSA block in memcpy_hsa(). Now the correct length is used. Signed-off-by:
Michael Holzheu <holzheu@linux.vnet.ibm.com> Signed-off-by:
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Martin Schwidefsky authored
The gmap_map_segment function creates a special invalid segment table entry with the address of the requested target location in the process address space. The first access will create the connection between the gmap segment table and the target page table of the main process. If two threads do this concurrently both will walk the page tables and allocate a gmap_rmap structure for the same segment table entry. To avoid the race recheck the segment table entry after taking to page table lock. Signed-off-by: -
Heiko Carstens authored
Implement gmap_translate() function which translates a guest absolute address to a user space process address without establishing the guest page table entries. This is useful for kvm guest address translations where no memory access is expected to happen soon (e.g. tprot exception handler). Signed-off-by:
Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by:
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- 17 Apr, 2013 29 commits
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Sebastian Ott authored
pci_disable_device is called by a driver after it stops using the pci function - e.g. during the removal of the driver. The current implementation removes the architecture specific information of this function such that even after a call to pci_enable_device the pci function is no longer usable. Just remove pcibios_disable_device. Reviewed-by:
Sebastian Ott <sebott@linux.vnet.ibm.com> Signed-off-by:
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Sebastian Ott authored
Disable pci on s390. Enable with pci=on. Suggested-by:
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Sebastian Ott authored
Access to pci config space via pci_ops should not fail silently. Reviewed-by:
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Sebastian Ott authored
If a pci load instruction fails the content of the register where the data is stored is possibly unchanged. Fix the inline assembly wrapper __pcilg to not return stale data. Additionally fix the callers of this function who access uninitialized variables. Reviewed-by:
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Sebastian Ott authored
Don't let pci_load and friends crash the kernel when called with e.g. an invalid offset. Return -ENXIO instead. Reviewed-by:
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Sebastian Ott authored
Use distinct (and hopefully sane) names for the pci instruction wrappers. Reviewed-by:
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Sebastian Ott authored
Uninline pci related instruction wrappers to de-bloat the code: add/remove: 15/0 grow/shrink: 2/24 up/down: 1326/-12628 (-11302) This is especially useful for the inlined pci read and write functions which are used all over the kernel. Also remove the unused __stpcifc while at it. Reviewed-by:
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Sebastian Ott authored
Use pcibios_add_device to do arch specific device initialization. This function will be called during pci_bus_add_device. Reviewed-by:
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Sebastian Ott authored
Don't modify function handles to get a disabled handle - call clp_disable_fh. With this change we also do no longer deconfigure enabled functions. Reviewed-by:
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Sebastian Ott authored
Use the debugfs to keep track of a pci function's status changes. Reviewed-by:
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Sebastian Ott authored
The hash used for mapping irq numbers to msi descriptors does not utilize all buckets that were allocated. Fix this by using the same value (computed by the number of bits used for the hash function) at relevant places. Reviewed-by:
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Michael Holzheu authored
This patch adds the last breaking event address as parameter for 31 bit compat program signal handlers as it is already done for 64 bit programs. Signed-off-by:
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Stefan Haberland authored
If too many ccw requests are pre-build before a suspend/resume cycle the device might not get enough memory to do path verification during resume. Requeue requests to the block device request queue on suspend and free pre-build ccw requests. Signed-off-by:
Stefan Haberland <stefan.haberland@de.ibm.com> Signed-off-by:
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Stefan Haberland authored
Reorganize format IO requests and enable usage of PAV. Signed-off-by:
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Sebastian Ott authored
cio_validate_subchannel is used to do some basic checks to find out if it's worth to further investigate a subchannel. Move the allocation and initialization of the subchannels locks to css_alloc_subchannel. Clean up the functions involved while at it. Reviewed-by:
Peter Oberparleiter <oberpar@linux.vnet.ibm.com> Signed-off-by:
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Sebastian Ott authored
Via ccw_device_init_count we keep track of how many devices are in asynchronous device recognition/initialization. For early devices this variable was not only used prior to its initialization but used incorrectly (incremented but never decremented). Fix this by using static initialization for this variable (and friends), make them visible to device.c only, and decrement the counter after recognition of early devices is finished. Reviewed-by:
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Sebastian Ott authored
Make css_probe_device static and remove an unimplemented prototype. Reviewed-by:
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Sebastian Ott authored
Use cio_register_early_subchannels to register early subchannels which are already in use. Call this function before we do the actual subchannel scanning loop. This helps us to get rid of some more special cases regarding the console subchannel. Reviewed-by:
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Sebastian Ott authored
Remove the static console ccw device (and friends) and use dynamic allocation for these structures. With this change the console device is treated (mostly) like any other ccw device and we can remove some special cases. Reviewed-by:
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Sebastian Ott authored
Remove the static console subchannel (and friends) and use dynamic allocation for these structures. With this change the console subchanel is treated (mostly) like any other subchannel and we can remove some special cases. Reviewed-by:
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Sebastian Ott authored
Split the subchannel registration in device_initialize and device_add and move the initialization part inside the allocation function. With this change we can use refcounting during the complete lifespan of a subchannel which is important for devices where we do the actually registration at a later time. Reviewed-by:
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Sebastian Ott authored
force_console is used to wake up the CCW based console device to print a panic message in case something goes wrong in a suspend or resume cycle. Stop using the static console_subchannel and add a parameter to this function to specify which ccw device we have to wake up. Reviewed-by:
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Sebastian Ott authored
wait_cons_dev is used to busy wait for an interrupt on the console ccw device. Stop using the static console_subchannel and add a parameter to this function to specify on which ccw device/subchannel we have to do the polling. While at it rename the function to ccw_device_wait_idle and move it to device.c Reviewed-by:
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Michael Holzheu authored
Since commit 5f954c34 ([S390] hibernation: fix lowcore handling) the absolute zero lowcore is lost during suspend/resume. For example, this leads to the problem that the re-IPL device for kdump is no longer set after resume. With this patch during suspend a buffer is allocated in the new PM notifier "suspend_pm_cb" and then the absolute zero lowcore is saved to that buffer. The resume code then copies back this buffer to absolute zero and afterwards the PM notifier releases the memory. Signed-off-by:
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Heiko Carstens authored
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Akinobu Mita authored
Use BITS_TO_LONGS() instead of __BITOPS_WORDS() that is considered to be private macro in asm/bitops.h for s390. Signed-off-by:
Akinobu Mita <akinobu.mita@gmail.com> Signed-off-by:
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Akinobu Mita authored
Remove unused __BITOPS_ALIGN, and replace __BITOPS_WORDSIZE with BITS_PER_LONG. Signed-off-by:
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Heiko Carstens authored
Use sske with multiple block control to initialize storage keys within a 1 MB frame at once. It turned out that the sske with mb=1 is an order of magnitude faster than pfmf. This is only an issue for very large systems (several 100GB) where storage key initialization could last more than a minute. Signed-off-by:
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Heiko Carstens authored
dumpstack() did not always print a sane callchain when being called. The reason is that show_trace() accessed register 15 directly to get the current stack pointer and passed that pointer to __show_trace() which expects a valid stack frame pointer as argument. However due to tail call optimization the stack frame may not exist anymore when __show_trace() gets called and therefore an invalid stack frame pointer gets passed. To prevent that disable tail call optimization for call chain walking functions. So move all the show_* functions to a dumpstack.c file like other architectures have it already and add a -fno-optimize-sibling-calls compile flag to both dumpstack.c and stacktrace.c to prevent tail call optimization. Fixes callchains that looked e.g. like this: [ 12.868258] Call Trace: [ 12.868262] ([<0000000000008000>] 0x8000) Signed-off-by:
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