- 18 Jan, 2018 5 commits
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Nicholas Piggin authored
Since e1689795 ("cpuidle: Add common time keeping and irq enabling"), cpuidle drivers are expected to return from ->enter with irqs disabled. Update the cpuidle-powernv snooze and cede loops to disable irqs before returning. Signed-off-by:
Nicholas Piggin <npiggin@gmail.com> Signed-off-by:
Michael Ellerman <mpe@ellerman.id.au>
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Nicholas Piggin authored
Since e1689795 ("cpuidle: Add common time keeping and irq enabling"), cpuidle drivers are expected to return from ->enter with irqs disabled. Update the cpuidle-powernv snooze loop to disable irqs before returning. Signed-off-by:
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Nicholas Piggin authored
powerpc calls irq_exit() with local irqs disabled, therefore it can define __ARCH_IRQ_EXIT_IRQS_DISABLED. Signed-off-by:
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Nicholas Piggin authored
The powerpc NMI IPIs may not be recoverable if they are taken in some sections of code, and also there have been and still are issues with taking NMIs (in KVM guest code, in firmware, etc) which makes them a bit dangerous to use. Generic code like softlockup detector and rcu stall detectors really hammer on trigger_*_backtrace, which has lead to further problems because we've implemented it with the NMI. So stop providing NMI backtraces for now. Importantly, the powerpc code uses NMI IPIs in crash/debug, and the SMP hardlockup watchdog. So if the softlockup and rcu hang detection traces are not being printed because the CPU is stuck with interrupts off, then the hard lockup watchdog should get it with the NMI IPI. Fixes: 2104180a ("powerpc/64s: implement arch-specific hardlockup watchdog") Signed-off-by:
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Nicholas Piggin authored
Book3S PACA memory allocation is restricted by the RMA limit and also must not take SLB faults when accessed in virtual mode. Currently a fixed 256MB limit is used for this, which is imprecise and sub-optimal. Update the paca allocation limits to use use the ppc64_rma_size for RMA limit, and share the safe_stack_limit() that is currently used for stack allocations that must not take virtual mode faults. The safe_stack_limit() name is changed to ppc64_bolted_size() to match ppc64_rma_size and some comments are updated. We also need to use early_mmu_has_feature() because we are now calling this function prior to the jump label patching that enables mmu_has_feature(). Signed-off-by:
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- 17 Jan, 2018 7 commits
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Nicholas Piggin authored
With the previous patch to switch to 64-bit mode after returning from RTAS and before doing any memory accesses, the RMA limit need not be clamped to 1GB to avoid RTAS bugs. Keep the 1GB limit for older firmware (although this is more of a kernel concern than RTAS), and remove it starting with POWER9. Signed-off-by:
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Nicholas Piggin authored
With the previous patch to switch to 64-bit mode after returning from RTAS and before doing any memory accesses, the RMA limit need not be clamped to 1GB to avoid RTAS bugs. Keep the 1GB limit for older firmware (although this is more of a kernel concern than RTAS), and remove it starting with POWER9. Signed-off-by:
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Nicholas Piggin authored
Commit 177ba7c6 ("powerpc/mm/radix: Limit paca allocation in radix") limited the paca allocation address to 1G on pSeries because RTAS return accesses the paca in 32-bit mode: On return from RTAS we access the paca variables and we have 64 bit disabled. This requires us to limit paca in 32 bit range. Fix this by setting ppc64_rma_size to first_memblock_size/1G range. Avoid this limit by switching to 64-bit mode before accessing any memory. Signed-off-by:
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Nicholas Piggin authored
The radix guest is not subject to the paravirtualized HPT VRMA limit, so remove that from ppc64_rma_size calculation for that platform. Signed-off-by:
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Nicholas Piggin authored
This removes the RMA limit on powernv platform, which constrains early allocations such as PACAs and stacks. There are still other restrictions that must be followed, such as bolted SLB limits, but real mode addressing has no constraints. Signed-off-by:
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Nicholas Piggin authored
There are several cases outside the normal address space management where a CPU's entire local TLB is to be flushed: 1. Booting the kernel, in case something has left stale entries in the TLB (e.g., kexec). 2. Machine check, to clean corrupted TLB entries. One other place where the TLB is flushed, is waking from deep idle states. The flush is a side-effect of calling ->cpu_restore with the intention of re-setting various SPRs. The flush itself is unnecessary because in the first case, the TLB should not acquire new corrupted TLB entries as part of sleep/wake (though they may be lost). This type of TLB flush is coded inflexibly, several times for each CPU type, and they have a number of problems with ISA v3.0B: - The current radix mode of the MMU is not taken into account, it is always done as a hash flushn For IS=2 (LPID-matching flush from host) and IS=3 with HV=0 (guest kernel flush), tlbie(l) is undefined if the R field does not match the current radix mode. - ISA v3.0B hash must flush the partition and process table caches as well. - ISA v3.0B radix must flush partition and process scoped translations, partition and process table caches, and also the page walk cache. So consolidate the flushing code and implement it in C and inline asm under the mm/ directory with the rest of the flush code. Add ISA v3.0B cases for radix and hash, and use the radix flush in radix environment. Provide a way for IS=2 (LPID flush) to specify the radix mode of the partition. Have KVM pass in the radix mode of the guest. Take out the flushes from early cputable/dt_cpu_ftrs detection hooks, and move it later in the boot process after, the MMU registers are set up and before relocation is first turned on. The TLB flush is no longer called when restoring from deep idle states. This was not be done as a separate step because booting secondaries uses the same cpu_restore as idle restore, which needs the TLB flush. Signed-off-by: -
Nicholas Piggin authored
The die() oops path contains a serializing lock to prevent oops messages from being interleaved. In the case of a system reset initiated oops (e.g., qemu nmi command), __die was being called which lacks that synchronisation and oops reports could be interleaved across CPUs. A recent patch 4388c9b3 ("powerpc: Do not send system reset request through the oops path") changed this to __die to avoid the debugger() call, but there is no real harm to calling it twice if the first time fell through. So go back to using die() here. This was observed to fix the problem. Fixes: 4388c9b3 ("powerpc: Do not send system reset request through the oops path") Signed-off-by:
David Gibson <david@gibson.dropbear.id.au> Signed-off-by:
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- 16 Jan, 2018 28 commits
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Benjamin Herrenschmidt authored
Trap numbers can have extra bits at the bottom that need to be filtered out. There are a few cases where we don't do that. It's possible that we got lucky but better safe than sorry. Signed-off-by:
Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by:
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Benjamin Herrenschmidt authored
The only difference between EXC_COMMON_HV and EXC_COMMON is that the former adds "2" to the trap number which is supposed to represent the fact that this is an "HV" interrupt which uses HSRR0/1. However KVM is the only one who cares and it has its own separate macros. In fact, we only have one user of EXC_COMMON_HV and it's for an unknown interrupt case. All the other ones already using EXC_COMMON. Signed-off-by:
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Benjamin Herrenschmidt authored
WORD2 if the TIMA isn't byte accessible and isn't that useful to know about, take out the pr_devel statement. Signed-off-by:
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Benjamin Herrenschmidt authored
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Benjamin Herrenschmidt authored
We used to not put the newline between the CPU part and the summary part on UP kernels. This is a rather pointless ifdef so take it out. Signed-off-by:
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Benjamin Herrenschmidt authored
These adapters can be found in a number of our systems, so let's enable the corresponding drivers by default. Signed-off-by:
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Christophe Leroy authored
When CONFIG_SWAP is set, the TLB miss handlers have to also take into account _PAGE_ACCESSED flag. At the moment it is done by anding _PAGE_ACCESSED into _PAGE_PRESENT using 3 instructions. This patch uses APG for handling _PAGE_ACCESSED, allowing to just copy _PAGE_ACCESSED bit into APG field, hence reducing the action to a single instruction. Signed-off-by:
Christophe Leroy <christophe.leroy@c-s.fr> Signed-off-by:
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Christophe Leroy authored
As Linux kernel separates KERNEL and USER address spaces, there is therefore no need to flag USER access at page level. Today, the 8xx TLB handlers already handle user access in the L1 entry through Access Protection Groups, it is then natural to move the user access handling at PMD level once _PAGE_NA allows to handle PAGE_NONE protection without _PAGE_USER In the mean time, as we free up one bit in the PTE, we can use it to include SPS (page size flag) in the PTE and avoid handling it at every TLB miss hence removing special handling based on compiled page size. For _PAGE_EXEC, we rework it to use PP PTE bits, avoiding the copy of _PAGE_EXEC bit into the L1 entry. Unfortunatly we are not able to put it at the correct location as it conflicts with NA/RO/RW bits for data entries. Upper bits of APG in L1 entry overlap with PMD base address. In order to avoid having to filter that out, we set up all groups so that upper bits can have any value. Signed-off-by:
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Christophe Leroy authored
Today, PAGE_NONE is defined as a page not having _PAGE_USER. In some circunstances, when the CPU supports it, it might be better to be able to flag a page with NO ACCESS. In a following patch, the 8xx will switch user access being flagged in the PMD, therefore it will not be possible anymore to use _PAGE_USER as a way to flag a page with no access. Signed-off-by:
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Christophe Leroy authored
commit ac29c640 ("powerpc/mm: Replace _PAGE_USER with _PAGE_PRIVILEGED") introduced _PAGE_PRIVILEGED for BOOK3S/64 This patch generalises _PAGE_PRIVILEGED for all CPUs, allowing to have either _PAGE_PRIVILEGED or _PAGE_USER or both. PPC_8xx has a _PAGE_SHARED flag which is set for and only for all non user pages. Lets rename it _PAGE_PRIVILEGED to remove confusion as it has nothing to do with Linux shared pages. On BookE, there's a _PAGE_BAP_SR which has to be set for kernel pages: defining _PAGE_PRIVILEGED as _PAGE_BAP_SR will make this generic Signed-off-by:
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Christophe Leroy authored
_PAGE_WRITETHRU is only used in: * AMIGA_Z2RAM block driver which is never activated on powerPC * Video/FB driver which is for PPC_PMAC Therefore, no need to spend time in 8xx TLB miss handlers for handling it. And by removing it, we free up bit 20 which then avoids having to clear it on each TLB miss. Signed-off-by:
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Christophe Leroy authored
In TLB miss handlers, updating the perf counter is only useful when performing a perf analysis. As it has a noticeable overhead, let's only do it when needed. In order to do so, the exit of the miss handlers will be patched when starting/stopping 'perf': the first register restore instruction of each exit point will be replaced by a jump to the counting code. Once this is done, CONFIG_PPC_8xx_PERF_EVENT becomes useless as this feature doesn't add any overhead. Signed-off-by:
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Christophe Leroy authored
EXCEPTION_PROLOG_0 and EXCEPTION_EPILOG_0 were added some time ago in order to regroup the two mtspr/mfspr to SCRATCH0 and SCRATCH1 and the mfcr/mtcr in order to ease entry and exit of function not using the full EXCEPTION_PROLOG. Since then, the mfcr/mtcr has been taken out, hence just leaving the two mtspr/mfspr in the macro. In order to improve readability of the exception functions, we remove those two macros and copy back the two mtspr/mfspr instead. As r10 and r11 are used for SCRATCH0 and SCRATCH1, lets also use r12 for SCRATCH2. It will also improve the readability/maintenance. Signed-off-by:
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Christophe Leroy authored
CPU6 ERRATA affects only MPC860 revisions prior to C.0. Manufacturing of those revisiosn was stopped in 1999-2000. Therefore, it has been almost 20 years since this ERRATA has been fixed in the silicon. This patch removes the workaround for that ERRATA. Signed-off-by:
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Christophe Leroy authored
Since commit 0e6e01ff ("CPM/QE: use genalloc to manage CPM/QE muram"), rheap is not used anymore. Signed-off-by:
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Balbir Singh authored
Certain HMI's such as malfunction error propagate through all threads/core on the system. If a thread was offline prior to us crashing the system and jumping to the kdump kernel, bad things happen when it wakes up due to an HMI in the kdump kernel. There are several possible ways to solve this problem 1. Put the offline cores in a state such that they are not woken up for machine check and HMI errors. This does not work, since we might need to wake up offline threads to handle TB errors 2. Ignore HMI errors, setup HMEER to mask HMI errors, but this still leads the window open for any MCEs and masking them for the duration of the dump might be a concern 3. Wake up offline CPUs, as in send them to crash_ipi_callback (not wake them up as in mark them online as seen by the hotplug). kexec does a wake_online_cpus() call, this patch does something similar, but instead sends an IPI and forces them to crash_ipi_callback() This patch takes approach #3. Care is taken to enable this only for powenv platforms via crash_wake_offline (a global value set at setup time). The crash code sends out IPI's to all CPU's which then move to crash_ipi_callback and kexec_smp_wait(). Signed-off-by:
Balbir Singh <bsingharora@gmail.com> Reviewed-by:
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Balbir Singh authored
Our check was extra cautious, we've audited crash_send_ipi and it sends an IPI only to online CPU's. Removal of this check should have not functional impact on crash kdump. Signed-off-by:
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Dmitry Torokhov authored
Instead of manually coding the loop with of_find_node_by_type(), let's switch to the standard macro for iterating over nodes with given type. Also fixed a couple of refcount leaks in the aforementioned loops. Signed-off-by:
Dmitry Torokhov <dmitry.torokhov@gmail.com> Signed-off-by:
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Christophe Leroy authored
This patch remove CONFIG_PPC_HTDUMP if not PPC_BOOK3S_64 to avoid below compile failure on BOOK3S_32: In file included from arch/powerpc/mm/dump_hashpagetable.c:27:0: ./arch/powerpc/include/asm/plpar_wrappers.h: In function 'get_cede_latency_hint': ./arch/powerpc/include/asm/plpar_wrappers.h:27:2: error: implicit declaration of function 'get_lppaca' [-Werror=implicit-function-declaration] ... arch/powerpc/mm/dump_hashpagetable.c: At top level: arch/powerpc/mm/dump_hashpagetable.c:69:13: error: 'SLB_VSID_B' undeclared here (not in a function) ... arch/powerpc/mm/dump_hashpagetable.c:506:38: error: 'VMEMMAP_BASE' undeclared (first use in this function) arch/powerpc/mm/dump_hashpagetable.c:506:35: error: assignment makes integer from pointer without a cast [-Werror] Fixes: dd5ac03e ("powerpc/mm: Fix page table dump build on non-Book3S") Signed-off-by:
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Nathan Fontenot authored
Add required bits to the architecture vector to enable support of the ibm,dynamic-memory-v2 device tree property. Signed-off-by:
Nathan Fontenot <nfont@linux.vnet.ibm.com> Signed-off-by:
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Nathan Fontenot authored
The Power Hypervisor has introduced a new device tree format for the property describing the dynamic reconfiguration LMBs for a system, ibm,dynamic-memory-v2. This new format condenses the size of the property, especially on large memory systems, by reporting sets of LMBs that have the same properties (flags and associativity array index). This patch updates the powerpc/mm/drmem.c code to provide routines that can parse the new device tree format during the walk_drmem_lmb* routines used during boot, the creation of the LMB array, and updating the device tree to create a new property in the proper format for ibm,dynamic-memory-v2. Signed-off-by:
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Nathan Fontenot authored
Now that the powerpc code parses dynamic reconfiguration memory LMB information from the LMB array and not the device tree directly we can move the of_drconf_cell struct to drmem.h where it fits better. In addition, the struct is renamed to of_drconf_cell_v1 in anticipation of upcoming support for version 2 of the dynamic reconfiguration property and the members are typed as __be* values to reflect how they exist in the device tree. Signed-off-by:
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Nathan Fontenot authored
Update the pseries memory hotplug code to use the newly added dynamic reconfiguration LMB array. Doing this is required for the upcoming support of version 2 of the dynamic reconfiguration device tree property. In addition, making this change cleans up the code that parses the LMB information as we no longer need to worry about device tree format. This allows us to discard one of the first steps on memory hotplug where we make a working copy of the device tree property and convert the entire property to cpu format. Instead we just use the LMB array directly while holding the memory hotplug lock. This patch also moves the updating of the device tree property to powerpc/mm/drmem.c. This allows to the hotplug code to work without needing to know the device tree format and provides a single routine for updating the device tree property. This new routine will handle determination of the proper device tree format and generate a properly formatted device tree property. Signed-off-by:
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Nathan Fontenot authored
Update code in powerpc/numa.c to use the walk_drmem_lmbs() routine instead of parsing the device tree directly. This is in anticipation of introducing a new ibm,dynamic-memory-v2 property with a different format. This will allow the numa code to use a single initialization routine per-LMB irregardless of the device tree format. Additionally, to support additional routines in numa.c that need to look up LMB information, an late_init routine is added to drmem.c to allocate the array of LMB information. This LMB array will provide per-LMB information to separate the LMB data from the device tree format. Signed-off-by:
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Nathan Fontenot authored
We currently have code to parse the dynamic reconfiguration LMB information from the ibm,dynamic-meory device tree property in multiple locations; numa.c, prom.c, and pseries/hotplug-memory.c. In anticipation of adding support for a version 2 of the ibm,dynamic-memory property this patch aims to separate the device tree information from the device tree format. Doing this requires a two step process to avoid a possibly very large bootmem allocation early in boot. During initial boot, new routines are provided to walk the device tree property and make a call-back for each LMB. The second step (introduced in later patches) will allocate an array of LMB information that can be used directly without needing to know the DT format. This approach provides the benefit of consolidating the device tree property parsing to a single location and (eventually) providing a common data structure for retrieving LMB information. This patch introduces a routine to walk the ibm,dynamic-memory property in the flattened device tree and updates the prom.c code to use this to initialize memory. Signed-off-by:
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Nathan Fontenot authored
Look up the associativity arrays in of_drconf_to_nid_single when deriving the nid for a LMB instead of having it passed in as a parameter. Signed-off-by:
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Nathan Fontenot authored
Look up the device node for the usable memory property instead of having it passed in as a parameter. This changes precedes an update in which the calling routines for of_get_usable_memory() will not have the device node pointer to pass in. Signed-off-by:
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Nathan Fontenot authored
Look up the device node for the associativity array property instead of having it passed in as a parameter. This changes precedes an update in which the calling routines for of_get_assoc_arrays() will not have the device node pointer to pass in. Signed-off-by:
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