- 31 Mar, 2017 14 commits
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Aneesh Kumar K.V authored
We don't support the full 57 bits of physical address and hence can overload the top bits of RPN as hash specific pte bits. Add a BUILD_BUG_ON() to enforce the relationship between H_PAGE_F_SECOND and H_PAGE_F_GIX. Signed-off-by:
Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Reviewed-by:
Paul Mackerras <paulus@ozlabs.org> [mpe: Move the BUILD_BUG_ON() into hash_utils_64.c and comment it] Signed-off-by:
Michael Ellerman <mpe@ellerman.id.au>
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Aneesh Kumar K.V authored
Max value supported by hardware is 51 bits address. Radix page table define a slot of 57 bits for future expansion. We restrict the value supported in linux kernel 53 bits, so that we can use the bits between 57-53 for storing hash linux page table bits. This is done in the next patch. This will free up the software page table bits to be used for features that are needed for both hash and radix. The current hash linux page table format doesn't have any free software bits. Moving hash linux page table specific bits to top of RPN field free up the software bits for other purpose. Signed-off-by:
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Aneesh Kumar K.V authored
Reviewed-by:
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Aneesh Kumar K.V authored
Conditional PTE bit definition is confusing and results in coding error. Reviewed-by:
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Aneesh Kumar K.V authored
Without this if firmware reports 1MB page size support we will crash trying to use 1MB as hugetlb page size. echo 300 > /sys/kernel/mm/hugepages/hugepages-1024kB/nr_hugepages kernel BUG at ./arch/powerpc/include/asm/hugetlb.h:19! ..... .... [c0000000e2c27b30] c00000000029dae8 .hugetlb_fault+0x638/0xda0 [c0000000e2c27c30] c00000000026fb64 .handle_mm_fault+0x844/0x1d70 [c0000000e2c27d70] c00000000004805c .do_page_fault+0x3dc/0x7c0 [c0000000e2c27e30] c00000000000ac98 handle_page_fault+0x10/0x30 With fix, we don't enable 1MB as hugepage size. bash-4.2# cd /sys/kernel/mm/hugepages/ bash-4.2# ls hugepages-16384kB hugepages-16777216kB Signed-off-by:
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Aneesh Kumar K.V authored
With this we have on powernv and pseries /proc/cpuinfo reporting timebase : 512000000 platform : PowerNV model : 8247-22L machine : PowerNV 8247-22L firmware : OPAL MMU : Hash Reviewed-by:
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Aneesh Kumar K.V authored
This bit is only used by radix and it is nice to follow the naming style of having bit name start with H_/R_ depending on which translation mode they are used. No functional change in this patch. Reviewed-by:
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Aneesh Kumar K.V authored
Define everything based on bits present in pgtable.h. This will help in easily identifying overlapping bits between hash/radix. No functional change with this patch. Reviewed-by:
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Aneesh Kumar K.V authored
For low slice, max addr should be less than 4G. Without limiting this correctly we will end up with a low slice mask which has 17th bit set. This is not a problem with the current code because our low slice mask is of type u16. But in later patch I am switching low slice mask to u64 type and having the 17bit set result in wrong slice mask which in turn results in mmap failures. Reviewed-by:
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Aneesh Kumar K.V authored
BOOKE code is dead code as per the Kconfig details. So make it simpler by enabling MM_SLICE only for book3s_64. The changes w.r.t nohash is just removing deadcode. W.r.t ppc64, 4k without hugetlb will now enable MM_SLICE. But that is good, because we reduce one extra variant which probably is not getting tested much. Reviewed-by:
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Yang Shi authored
sam440ep_setup_rtc() is just called by machine_device_initcall() so make it __init. Signed-off-by:
Yang Shi <yang.shi@windriver.com> Signed-off-by:
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Hari Bathini authored
With the unnecessary restriction to reserve memory for fadump at the top of RAM forgone, update the documentation accordingly. Signed-off-by:
Hari Bathini <hbathini@linux.vnet.ibm.com> Signed-off-by:
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Hari Bathini authored
Currently, the area to preserve boot memory is reserved at the top of RAM. This leaves fadump vulnerable to memory hot-remove operations. As memory for fadump has to be reserved early in the boot process, fadump can't be registered after a memory hot-remove operation. Though this problem can't be eleminated completely, the impact can be minimized by reserving memory at an offset closer to bottom of the RAM. The offset for fadump memory reservation can be any value greater than fadump boot memory size. Signed-off-by:
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Vipin K Parashar authored
OPAL returns OPAL_WRONG_STATE upon failing to provide sensor data due to core sleeping/offline. Add a check in opal_get_sensor_data() for sensor read failure with OPAL_WRONG_STATE return code and return -EIO. Signed-off-by:
Vipin K Parashar <vipin@linux.vnet.ibm.com> Signed-off-by:
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- 28 Mar, 2017 1 commit
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Thadeu Lima de Souza Cascardo authored
For the current task, the kernel stack would only tell the last time the process was rescheduled, if ever. Use the current stack pointer for the current task. Otherwise, every once in a while, the stacktrace printed when reading /proc/self/stack would look like the process is running in userspace, while it's not, which some may consider as a bug. This is also consistent with some other architectures, like x86 and arm, at least. Signed-off-by:
Thadeu Lima de Souza Cascardo <cascardo@canonical.com> Signed-off-by:
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- 27 Mar, 2017 9 commits
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Michael Ellerman authored
cpu_ready_for_interrupts() is called after feature patching, so there's no need to use early_cpu_has_feature(). Signed-off-by: -
Anton Blanchard authored
The config option for the POWER8 crc32c recently changed from CONFIG_CRYPT_CRC32C_VPMSUM to CONFIG_CRYPTO_CRC32C_VPMSUM. Update the configs. Signed-off-by:
Anton Blanchard <anton@samba.org> Signed-off-by:
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Anton Blanchard authored
Most people use perf these days, so save about 31kB by making oprofile a module. Signed-off-by:
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Anton Blanchard authored
It turns out cloud-config uses ISO9660 filesystems to inject configuration data into cloud images. The cloud-config failures when ISO9660_FS is not enabled are cryptic, and building it in makes mainline testing easier, so re-enable it. Signed-off-by:
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Michael Neuling authored
POWER9 adds form 1 scoms. The form of the indirection is specified in the top nibble of the scom address. Currently we do some (ugly) bit mangling so that we can fit a 64 bit scom address into the debugfs interface. The current code only shifts the top bit (indirect bit). This patch changes it to shift the whole top nibble so that the form of the indirection is also shifted. This patch is backwards compatible with older scoms. (This change isn't required in the arch/powerpc/platforms/powernv/opal-prd.c scom interface as it passes the whole 64bit scom address without any bit mangling) Signed-off-by:
Michael Neuling <mikey@neuling.org> Signed-off-by:
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Oliver O'Halloran authored
Currently the code to perform an OPAL call is duplicated between the normal path and path taken when tracepoints are enabled. There's no real need for this and combining them makes opal_tracepoint_entry considerably easier to understand. Signed-off-by:
Oliver O'Halloran <oohall@gmail.com> Signed-off-by:
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Guilherme G. Piccoli authored
Currently the xmon debugger is set only via kernel boot command-line. It's disabled by default, and can be enabled with "xmon=on" on the command-line. Also, xmon may be accessed via sysrq mechanism. But we cannot enable/disable xmon in runtime, it needs kernel reload. This patch introduces a debugfs entry for xmon, allowing user to query its current state and change it if desired. Basically, the "xmon" file to read from/write to is under the debugfs mount point, on powerpc directory. It's a simple attribute, value 0 meaning xmon is disabled and value 1 the opposite. Writing these states to the file will take immediate effect in the debugger. Signed-off-by:
Guilherme G. Piccoli <gpiccoli@linux.vnet.ibm.com> Signed-off-by:
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Guilherme G. Piccoli authored
The xmon parameter nobt was added long time ago, by commit 26c8af5f ("[POWERPC] print backtrace when entering xmon"). The problem that time was that during a crash in a machine with USB keyboard, xmon wouldn't respond to commands from the keyboard, so printing the backtrace wouldn't be possible. Idea then was to show automatically the backtrace on xmon crash for the first time it's invoked (if it recovers, next time xmon won't show backtrace automatically). The nobt parameter was added _only_ to prevent this automatic trace show. Seems long time ago USB keyboards didn't work that well! We don't need this parameter anymore, the feature of auto showing the backtrace is interesting (imagine a case of auto-reboot script), so this patch extends the functionality, by always showing the backtrace automatically when xmon is invoked; it removes the nobt parameter too. Also, this patch fixes __initdata placement on xmon_early and replaces __initcall() with modern device_initcall() on sysrq handler. Signed-off-by:
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Pan Xinhui authored
Once xmon is triggered by sysrq-x, it is enabled always afterwards even if it is disabled during boot. This will cause a system reset interrupt fail to dump. So keep xmon in its original state after exit. We have several ways to set xmon on or off. 1) by a build config CONFIG_XMON_DEFAULT. 2) by a boot cmdline with xmon or xmon=early or xmon=on to enable xmon and xmon=off to disable xmon. This value will override that in step 1. 3) by a debugfs interface, as proposed in this patchset. And this value can override those in step 1 and 2. Signed-off-by:
Pan Xinhui <xinhui.pan@linux.vnet.ibm.com> Signed-off-by:
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- 21 Mar, 2017 13 commits
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Nicholas Piggin authored
POWER8 uses bit 36 in SRR1 like POWER9 for i-side machine checks, and contains several conditions for link timeouts that are not currently handled. Signed-off-by:
Nicholas Piggin <npiggin@gmail.com> Signed-off-by:
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Nicholas Piggin authored
Move the handling (corrective action) of machine checks to the table based evaluation. This changes P7 and P8 ERAT flushing from using SLB flush to using ERAT flush. Signed-off-by:
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Nicholas Piggin authored
Have machine types define i-side and d-side tables to describe their machine check encodings, and match entries to evaluate (for reporting) machine checks. Functionality is mostly unchanged (tested with a userspace harness), but it does make a change in that it no longer records DAR as the effective address for those errors where it is specified to be invalid (which is a reporting change only). Signed-off-by:
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Nicholas Piggin authored
Signed-off-by:
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Nicholas Piggin authored
Use the flush function introduced with the POWER9 machine check handler for POWER7 and 8, rather than open coding it multiple times in callers. There is a specific ERAT flush type introduced for POWER9, but the POWER7-8 ERAT errors continue to do SLB flushing (which also flushes ERAT), so as not to introduce functional changes with this cleanup patch. Signed-off-by:
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Nicholas Piggin authored
Print the faulting address of the machine check that may help with debugging. The effective address reported can be a target memory address rather than the faulting instruction address. Fix up a dangling bracket while here. Signed-off-by:
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Michael Ellerman authored
We'd like to eventually remove NO_IRQ on powerpc, so remove usages of it from electra_cf.c which is a powerpc-only driver. Signed-off-by: -
Geert Uytterhoeven authored
Submitters of device tree binding documentation may forget to CC the subsystem maintainer if this is missing. Signed-off-by:
Geert Uytterhoeven <geert@linux-m68k.org> Signed-off-by:
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Ben Hutchings authored
Add declarations for: - __mfdcr, __mtdcr (if CONFIG_PPC_DCR_NATIVE=y; through <asm/dcr.h>) - switch_mmu_context (if CONFIG_PPC_BOOK3S_64=n; through <asm/mmu_context.h>) Signed-off-by:
Ben Hutchings <ben@decadent.org.uk> Signed-off-by:
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Ben Hutchings authored
The symbols exported for use by MOL/rtlinux aren't getting CRCs and I was about to fix that. But MOL is dead upstream, and the latest work on it was to make it use KVM instead of its own kernel module. So remove them instead. Signed-off-by:
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Laurent Dufour authored
Since the fault retry is now handled earlier, we can release the mmap_sem lock earlier too and remove later unlocking previously done in mm_fault_error(). Reviewed-by:
Laurent Dufour <ldufour@linux.vnet.ibm.com> Signed-off-by:
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Laurent Dufour authored
In do_page_fault() if handle_mm_fault() returns VM_FAULT_RETRY, retry the page fault handling before anything else. This would simplify the handling of the mmap_sem lock in this part of the code. Reviewed-by:
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Laurent Dufour authored
Move mmap_sem releasing in the do_sigbus()'s unique caller : mm_fault_error() No functional changes. Reviewed-by:
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- 20 Mar, 2017 3 commits
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Alexey Kardashevskiy authored
PNV_IODA_PE_DEV is only used for NPU devices (emulated PCI bridges representing NVLink). These are added to IOMMU groups with corresponding NVIDIA devices after all non-NPU PEs are setup; a special helper - pnv_pci_ioda_setup_iommu_api() - handles this in pnv_pci_ioda_fixup(). The pnv_pci_ioda2_setup_dma_pe() helper sets up DMA for a PE. It is called for VFs (so it does not handle NPU case) and PCI bridges but only IODA1 and IODA2 types. An NPU bridge has its own type id (PNV_PHB_NPU) so pnv_pci_ioda2_setup_dma_pe() cannot be called on NPU and therefore (pe->flags & PNV_IODA_PE_DEV) is always "false". This removes not used iommu_add_device(). This should not cause any behavioral change. Signed-off-by:
Alexey Kardashevskiy <aik@ozlabs.ru> Acked-by:
Gavin Shan <gwshan@linux.vnet.ibm.com> Reviewed-by:
David Gibson <david@gibson.dropbear.id.au> Signed-off-by:
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Alexey Kardashevskiy authored
The iommu_table_ops callbacks are declared CPU endian as they take and return "unsigned long"; underlying hardware tables are big-endian. However get() was missing be64_to_cpu(), this adds the missing conversion. The only caller of this is crash dump at arch/powerpc/kernel/iommu.c, iommu_table_clear() which only compares TCE to zero so this change should not cause behavioral change. Signed-off-by:
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Tobin C. Harding authored
Sparse emits a warning: symbol 'prepare_ftrace_return' was not declared. Should it be static? prepare_ftrace_return() is called from assembler and should not be static. Add a prototype for it to asm-prototypes.h and include that in ftrace.c. Signed-off-by:
Tobin C. Harding <me@tobin.cc> Signed-off-by:
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