- 26 Apr, 2013 23 commits
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Gavin Shan authored
The patch intends to build 32-bits DMA space for individual PEs on PHB3. The TVE# is recognized by the combo of PE# and fixed bits from DMA address, which is zero for 32-bits DMA space. Signed-off-by:
Gavin Shan <shangw@linux.vnet.ibm.com> Signed-off-by:
Benjamin Herrenschmidt <benh@kernel.crashing.org>
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Gavin Shan authored
The TCE should be invalidated while it's created or free'd. The approach to do that for IODA1 and IODA2 compliant PHBs are different. So the patch differentiate them with different functions called to do that for IODA1 and IODA2 compliant PHBs. It's notable that the PCI address is used to invalidate the corresponding TCE on IODA2 compliant PHB3. Signed-off-by:
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Gavin Shan authored
The EOI handler of MSI/MSI-X interrupts for P8 (PHB3) need additional steps to handle the P/Q bits in IVE before EOIing the corresponding interrupt. The patch changes the EOI handler to cover that. we have individual IRQ chip in each PHB instance. During the MSI IRQ setup time, the IRQ chip is copied over from the original one for that IRQ, and the EOI handler is patched with the one that will handle the P/Q bits (As Ben suggested). Signed-off-by:
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Gavin Shan authored
As Michael Ellerman suggested, to add CONFIG_POWERNV_MSI for PowerNV platform. That's similar to CONFIG_PSERIES_MSI for pSeries platform. For now, we don't make it dependent on CONFIG_EEH since it's not ready to enable that yet. Apart from that, we also enable CONFIG_PPC_MSI_BITMAP on selecting CONFIG_POWERNV_MSI. Signed-off-by:
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Gavin Shan authored
The patch intends to initialize PHB3 during system boot stage. The flag "PNV_PHB_MODEL_PHB3" is introduced to differentiate IODA2 compatible PHB3 from other types of PHBs. Signed-off-by: -
Paul Mackerras authored
Building a 64-bit powerpc kernel with PR KVM enabled currently gives this error: AS arch/powerpc/kernel/head_64.o arch/powerpc/kernel/exceptions-64s.S: Assembler messages: arch/powerpc/kernel/exceptions-64s.S:258: Error: attempt to move .org backwards make[2]: *** [arch/powerpc/kernel/head_64.o] Error 1 This happens because the MASKABLE_EXCEPTION_PSERIES macro turns into 33 instructions, but we only have space for 32 at the decrementer interrupt vector (from 0x900 to 0x980). In the code generated by the MASKABLE_EXCEPTION_PSERIES macro, we currently have two instances of the HMT_MEDIUM macro, which has the effect of setting the SMT thread priority to medium. One is the first instruction, and is overwritten by a no-op on processors where we save the PPR (processor priority register), that is, POWER7 or later. The other is after we have saved the PPR. In order to reduce the code at 0x900 by one instruction, we omit the first HMT_MEDIUM. On processors without SMT this will have no effect since HMT_MEDIUM is a no-op there. On POWER5 and RS64 machines this will mean that the first few instructions take a little longer in the case where a decrementer interrupt occurs when the hardware thread is running at low SMT priority. On POWER6 and later machines, the hardware automatically boosts the thread priority when a decrementer interrupt is taken if the thread priority was below medium, so this change won't make any difference. The alternative would be to branch out of line after saving the CFAR. However, that would incur an extra overhead on all processors, whereas the approach adopted here only adds overhead on older threaded processors. Signed-off-by:
Paul Mackerras <paulus@samba.org> Signed-off-by:
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Nathan Fontenot authored
There are instances in which we do not want topology updates to occur. In order to allow this a /proc interface (/proc/powerpc/topology_updates) is introduced so that topology updates can be enabled and disabled. This patch also adds a prrn_is_enabled() call so that PRRN events are handled in the kernel only if topology updating is enabled. Signed-off-by:
Nathan Fontenot <nfont@linux.vnet.ibm.com> Signed-off-by:
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Nathan Fontenot authored
The Linux kernel and platform firmware negotiate their mutual support of the PRRN option via the ibm,client-architecture-support interface. This patch simply sets the appropriate fields in the client architecture vector to indicate Linux support for PRRN and will allow the firmware to report PRRN events via the RTAS event-scan mechanism. Signed-off-by:
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Jesse Larrew authored
The new PRRN firmware feature provides a more convenient and event-driven interface than VPHN for notifying Linux of changes to the NUMA affinity of platform resources. However, for practical reasons, it may not be feasible for some customers to update to the latest firmware. For these customers, the VPHN feature supported on previous firmware versions may still be the best option. The VPHN feature was previously disabled due to races with the load balancing code when accessing the NUMA cpu maps, but the new stop_machine() approach protects the NUMA cpu maps from these concurrent accesses. It should be safe to re-enable this feature now. Signed-off-by:
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Jesse Larrew authored
The following patch adds vdso_getcpu_init(), which stores the NUMA node for a cpu in SPRG3: Commit 18ad51dd ("powerpc: Add VDSO version of getcpu") adds vdso_getcpu_init(), which stores the NUMA node for a cpu in SPRG3. This patch ensures that this information is also updated when the NUMA affinity of a cpu changes. Signed-off-by:
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Nathan Fontenot authored
The new PRRN firmware feature allows CPU and memory resources to be transparently reassigned across NUMA boundaries. When this happens, the kernel must update the node maps to reflect the new affinity information. Although the NUMA maps can be protected by locking primitives during the update itself, this is insufficient to prevent concurrent accesses to these structures. Since cpumask_of_node() hands out a pointer to these structures, they can still be modified outside of the lock. Furthermore, tracking down each usage of these pointers and adding locks would be quite invasive and difficult to maintain. The approach used is to make a list of affected cpus and call stop_machine to have the update routine run on each of the affected cpus allowing them to update themselves. Each cpu finds itself in the list of cpus and makes the appropriate updates. We need to have each cpu do this for themselves to handle calls to vdso_getcpu_init() added in a subsequent patch. Situations like these are best handled using stop_machine(). Since the NUMA affinity updates are exceptionally rare events, this approach has the benefit of not adding any overhead while accessing the NUMA maps during normal operation. Signed-off-by:
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Jesse Larrew authored
Platform events such as partition migration or the new PRRN firmware feature can cause the NUMA characteristics of a CPU to change, and these changes will be reflected in the device tree nodes for the affected CPUs. This patch registers a handler for Open Firmware device tree updates and reconfigures the CPU and node maps whenever the associativity changes. Currently, this is accomplished by marking the affected CPUs in the cpu_associativity_changes_mask and allowing arch_update_cpu_topology() to retrieve the new associativity information using hcall_vphn(). Protecting the NUMA cpu maps from concurrent access during an update operation will be addressed in a subsequent patch in this series. Signed-off-by:
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Nathan Fontenot authored
Update the numa code to use the updated firmware_has_feature() when checking for type 1 affinity. Signed-off-by:
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Nathan Fontenot authored
The firmware_has_feature() function makes it easy to check for supported features of the hypervisor. This patch extends the capability of firmware_has_feature() to include checking for specified bits in vector 5 of the architecture vector as reported in the device tree. As part of this the #defines used for the architecture vector are re-defined such that each option has the index into vector 5 and the feature bit encoded into it. This makes checking for architecture bits when initiating data for firmware_has_feature much easier. Signed-off-by:
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Nathan Fontenot authored
When iterating over the entries in firmware_features_table we only need to go over the actual number of entries in the array instead of declaring it to be bigger and checking to make sure there is a valid entry in every slot. This patch removes the FIRMWARE_MAX_FEATURES #define and replaces the array looping with the use of ARRAY_SIZE(). Signed-off-by:
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Nathan Fontenot authored
As part of handling of PRRN events we need to check vector 5 of the architecture vector bits reported in the device tree to ensure PRRN event handling is enabled. To do this firmware_has_feature() is updated (in a subsequent patch) to make this check vector 5 bits. To avoid having to re-define bits in the architecture vector the bit definitions are moved to prom.h. Signed-off-by:
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Jesse Larrew authored
A PRRN event is signaled via the RTAS event-scan mechanism, which returns a Hot Plug Event message "fixed part" indicating "Platform Resource Reassignment". In response to the Hot Plug Event message, we must call ibm,update-nodes to determine which resources were reassigned and then ibm,update-properties to obtain the new affinity information about those resources. The PRRN event-scan RTAS message contains only the "fixed part" with the "Type" field set to the value 160 and no Extended Event Log. The four-byte Extended Event Log Length field is re-purposed (since no Extended Event Log message is included) to pass the "scope" parameter that causes the ibm,update-nodes to return the nodes affected by the specific resource reassignment. This patch adds a handler for RTAS events. The function pseries_devicetree_update() (from mobility.c) is used to make the ibm,update-nodes/ibm,update-properties RTAS calls. Updating the NUMA maps (handled by a subsequent patch) will require significant processing, so pseries_devicetree_update() is called from an asynchronous workqueue to allow event processing to continue. PRRN RTAS events on pseries systems are rare events that have to be initiated from the HMC console for the system by an IBM tech. This allows us to assume that these events are widely spaced. Additionally, all work on the queue is flushed before handling any new work to ensure we only have one event in flight being handled at a time. Signed-off-by:
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Nathan Fontenot authored
Correct parsing of the buffer returned from ibm,update-properties. The first element is a length and the path to the property which is slightly different from the list of properties in the buffer so we need to specifically handle this. Signed-off-by:
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Nathan Fontenot authored
Newer firmware on Power systems can transparently reassign platform resources (CPU and Memory) in use. For instance, if a processor or memory unit is predicted to fail, the platform may transparently move the processing to an equivalent unused processor or the memory state to an equivalent unused memory unit. However, reassigning resources across NUMA boundaries may alter the performance of the partition. When such reassignment is necessary, the Platform Resource Reassignment Notification (PRRN) option provides a mechanism to inform the Linux kernel of changes to the NUMA affinity of its platform resources. When rtasd receives a PRRN event, it needs to make a series of RTAS calls (ibm,update-nodes and ibm,update-properties) to retrieve the updated device tree information. These calls are already handled in the pseries_devicetree_update() routine used in partition migration. This patch exposes pseries_devicetree_update() to make it accessible to other pseries routines, this patch also updates pseries_devicetree_update() to take a 32-bit scope parameter. The scope value, which was previously hard coded to 1 for partition migration, is used for the RTAS calls ibm,update-nodes/properties to update the device tree. Signed-off-by:
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Michael Neuling authored
POWER8 allows us to take interrupts with the MMU on. This gives us a second set of vectors offset at 0x4000. Unfortunately when coping these vectors we missed checking for MSR HV for hardware interrupts (0x500). This results in us trying to use HSRR0/1 when HV=0, rather than SRR0/1 on HW IRQs The below fixes this to check CPU_FTR_HVMODE when patching the code at 0x4500. Also we remove the check for CPU_FTR_ARCH_206 since relocation on IRQs are only available in arch 2.07 and beyond. Thanks to benh for helping find this. Signed-off-by:
Michael Neuling <mikey@neuling.org> CC: <stable@vger.kernel.org> Signed-off-by:
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Michael Neuling authored
In __restore_cpu_power8 we determine if we are HV and if not, we return before setting HV only resources. Unfortunately we forgot to restore the link register from r11 before returning. This will happen on boot and with secondary CPUs not coming online. This adds the missing link register restore. Signed-off-by:
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Michael Neuling authored
In __after_prom_start we copy the kernel down to zero in two calls to copy_and_flush. After the first call (copy from 0 to copy_to_here:) we jump to the newly copied code soon after. Unfortunately there's no isync between the copy of this code and the jump to it. Hence it's possible that stale instructions could still be in the icache or pipeline before we branch to it. We've seen this on real machines and it's results in no console output after: calling quiesce... returning from prom_init The below adds an isync to ensure that the copy and flushing has completed before any branching to the new instructions occurs. Signed-off-by:
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Michael Neuling authored
We are currently out of free bits in AT_HWCAP. With POWER8, we have several hardware features that we need to advertise. Tested on POWER and x86. Signed-off-by:
Michael Neuling <michael@neuling.org> Signed-off-by:
Nishanth Aravamudan <nacc@linux.vnet.ibm.com> Signed-off-by:
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- 24 Apr, 2013 7 commits
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Benjamin Herrenschmidt authored
We need PPC_MSI_BITMAP support Signed-off-by: -
Benjamin Herrenschmidt authored
Merge upstream to get the audit fixes
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Michael Ellerman authored
In commit 85fe4025 (fs: do not assign default i_ino in new_inode), the initialisation of i_ino was removed from new_inode() and pushed down into the callers. However spufs_new_inode() was not updated. This exhibits as no files appearing in /spu, because all our dirents have a zero inode, which readdir() seems to dislike. Cc: stable@vger.kernel.org Signed-off-by:
Michael Ellerman <michael@ellerman.id.au> Signed-off-by:
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Vasant Hegde authored
Add new return code to rtas_flash to indicate firmware entitlement expiry. Strictly we don't need this update. But to keep it in sync with PAPR, this was added. Signed-off-by:
Ananth N Mavinakayanahalli <ananth@in.ibm.com> Signed-off-by:
Vasant Hegde <hegdevasant@linux.vnet.ibm.com> Signed-off-by:
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Vasant Hegde authored
Add proper comment to ibm,validate-flash-image RTAS call update result tokens. Note: Only comment section is modified, no code change. Signed-off-by:
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Michael Ellerman authored
None of the cell platforms support CPU hotplug, so we should iterate only over online nodes when setting PMU interrupts. This also fixes a warning during boot when NODES_SHIFT is large enough: WARNING: at /scratch/michael/src/kmk/linus/kernel/irq/irqdomain.c:766 ... NIP [c0000000000db278] .irq_linear_revmap+0x30/0x58 LR [c0000000000dc2a0] .irq_create_mapping+0x38/0x1a8 Call Trace: [c0000003fc9c3af0] [c0000000000dc2a0] .irq_create_mapping+0x38/0x1a8 (unreliable) [c0000003fc9c3b80] [c000000000655c1c] .__machine_initcall_cell_cbe_init_pm_irq+0x84/0x158 [c0000003fc9c3c20] [c00000000000afb4] .do_one_initcall+0x5c/0x1e0 [c0000003fc9c3cd0] [c000000000644580] .kernel_init_freeable+0x238/0x328 [c0000003fc9c3db0] [c00000000000b784] .kernel_init+0x1c/0x120 [c0000003fc9c3e30] [c000000000009fb8] .ret_from_kernel_thread+0x64/0xac This is caused by us overflowing our linear revmap because we're requesting too many interrupts. Reported-by:
Dennis Schridde <devurandom@gmx.net> Signed-off-by:
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Benjamin Herrenschmidt authored
Merge the tentative powerpc-next branch maintained by Michael while I was on vacation
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- 23 Apr, 2013 4 commits
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Chen Gang authored
need set '\0' for 'local_buffer'. SPLPAR_MAXLENGTH is 1026, RTAS_DATA_BUF_SIZE is 4096. so the contents of rtas_data_buf may truncated in memcpy. if contents are really truncated. the splpar_strlen is more than 1026. the next while loop checking will not find the end of buffer. that will cause memory access violation. Signed-off-by:
Chen Gang <gang.chen@asianux.com> Signed-off-by:
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Andy Shevchenko authored
Signed-off-by:
Andy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by:
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Oleg Nesterov authored
arch_dup_task_struct() does flush_ptrace_hw_breakpoint(src), this destroys the parent's breakpoints for no reason. We should clear child->thread.ptrace_bps[] copied by dup_task_struct() instead. Signed-off-by:
Oleg Nesterov <oleg@redhat.com> Acked-by:
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Adhemerval Zanella authored
On 04/18/2013 07:38 PM, Anton Blanchard wrote: > Since you are only reading one long you shouldn't need to check the > update count and loop, you will always see a consistent value. The > system call version of time() just does an unprotected load for example. Fixed. > With the above change and with Michael's comments covered (decent > changelog entry and Signed-off-by): > > Acked-by: Anton Blanchard <anton@samba.org> Thanks for the review, below the updated patch: From: Adhemerval Zanella <azanella@linux.vnet.ibm.com> This patch implement the time syscall as vDSO. The performance speedups are: Baseline PPC32: 380 nsec Baseline PPC64: 350 nsec vdso PPC32: 20 nsec vsdo PPC64: 20 nsec Tested on 64 bit build with both 32 bit and 64 bit userland. Acked-by:
Anton Blanchard <anton@samba.org> Signed-off-by:
Adhemerval Zanella <azanella@linux.vnet.ibm.com> Signed-off-by:
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- 21 Apr, 2013 6 commits
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Linus Torvalds authored
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/tipLinus Torvalds authored
Pull perf fixes from Ingo Molnar: "Misc fixes" * 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: perf/x86: Fix offcore_rsp valid mask for SNB/IVB perf: Treat attr.config as u64 in perf_swevent_init()
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Linus Torvalds authored
I'm going to do an -rc8, so I'm just going to do this rather than delay it any further. They are arguably stable material anyway. * vm_ioremap_memory-examples: mtdchar: remove no-longer-used vma helpers vm: convert snd_pcm_lib_mmap_iomem() to vm_iomap_memory() helper vm: convert fb_mmap to vm_iomap_memory() helper vm: convert mtdchar mmap to vm_iomap_memory() helper vm: convert HPET mmap to vm_iomap_memory() helper
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/tipLinus Torvalds authored
Pull kdump fixes from Peter Anvin: "The kexec/kdump people have found several problems with the support for loading over 4 GiB that was introduced in this merge cycle. This is partly due to a number of design problems inherent in the way the various pieces of kdump fit together (it is pretty horrifically manual in many places.) After a *lot* of iterations this is the patchset that was agreed upon, but of course it is now very late in the cycle. However, because it changes both the syntax and semantics of the crashkernel option, it would be desirable to avoid a stable release with the broken interfaces." I'm not happy with the timing, since originally the plan was to release the final 3.9 tomorrow. But apparently I'm doing an -rc8 instead... * 'x86-kdump-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: kexec: use Crash kernel for Crash kernel low x86, kdump: Change crashkernel_high/low= to crashkernel=,high/low x86, kdump: Retore crashkernel= to allocate under 896M x86, kdump: Set crashkernel_low automatically
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/tipLinus Torvalds authored
Pull x86 fixes from Peter Anvin: "Three groups of fixes: 1. Make sure we don't execute the early microcode patching if family < 6, since it would touch MSRs which don't exist on those families, causing crashes. 2. The Xen partial emulation of HyperV can be dealt with more gracefully than just disabling the driver. 3. More EFI variable space magic. In particular, variables hidden from runtime code need to be taken into account too." * 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: x86, microcode: Verify the family before dispatching microcode patching x86, hyperv: Handle Xen emulation of Hyper-V more gracefully x86,efi: Implement efi_no_storage_paranoia parameter efi: Export efi_query_variable_store() for efivars.ko x86/Kconfig: Make EFI select UCS2_STRING efi: Distinguish between "remaining space" and actually used space efi: Pass boot services variable info to runtime code Move utf16 functions to kernel core and rename x86,efi: Check max_size only if it is non-zero. x86, efivars: firmware bug workarounds should be in platform code -
git://git.linaro.org/people/rmk/linux-armLinus Torvalds authored
Pull ARM fixes from Russell King: "A set of fixes from various people - Will Deacon gets a prize for removing code this time around. The biggest fix in this lot is sorting out the ARM740T mess. The rest are relatively small fixes." * 'fixes' of git://git.linaro.org/people/rmk/linux-arm: ARM: 7699/1: sched_clock: Add more notrace to prevent recursion ARM: 7698/1: perf: fix group validation when using enable_on_exec ARM: 7697/1: hw_breakpoint: do not use __cpuinitdata for dbg_cpu_pm_nb ARM: 7696/1: Fix kexec by setting outer_cache.inv_all for Feroceon ARM: 7694/1: ARM, TCM: initialize TCM in paging_init(), instead of setup_arch() ARM: 7692/1: iop3xx: move IOP3XX_PERIPHERAL_VIRT_BASE ARM: modules: don't export cpu_set_pte_ext when !MMU ARM: mm: remove broken condition check for v4 flushing ARM: mm: fix numerous hideous errors in proc-arm740.S ARM: cache: remove ARMv3 support code ARM: tlbflush: remove ARMv3 support
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