- 01 Apr, 2020 12 commits
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Nicholas Piggin authored
The real mode interrupt entry points currently use rfid to branch to the common handler in virtual mode. This is a significant amount of code, and forces other code (notably the KVM test) to live in the real mode handler. In the interest of minimising the amount of code that runs unrelocated move the switch to virt mode into the common code, and do it with mtmsrd, which avoids clobbering SRRs (although the post-KVMTEST performance of real-mode interrupt handlers is not a big concern these days). This requires CTR to always be saved (real-mode needs to reach 0xc...) but that's not a huge impact these days. It could be optimized away in future. mpe: Incorporate fix from Nick: It's possible for interrupts to be replayed when TM is enabled and suspended, for example rt_sigreturn, where the mtmsrd MSR_KERNEL in the real-mode entry point to the common handler causes a TM Bad Thing exception (due to attempting to clear suspended). The fix for this is to have replay interrupts go to the _virt entry point and skip the mtmsrd, which matches what happens before this patch. Signed-off-by:
Nicholas Piggin <npiggin@gmail.com> Signed-off-by:
Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20200225173541.1549955-11-npiggin@gmail.com
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Nicholas Piggin authored
Rather than using DAR=2 to select the i-side registers, add an explicit option. Signed-off-by:
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Nicholas Piggin authored
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Nicholas Piggin authored
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Nicholas Piggin authored
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Nicholas Piggin authored
Aside from label names and BUG line numbers, the generated code change is an additional HMI KVM handler added for the "late" KVM handler, because early and late HMI generation is achieved by defining two different interrupt types. Signed-off-by:
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Nicholas Piggin authored
These don't provide a large amount of code sharing. Removing them makes code easier to shuffle around. For example, some of the common instructions will be moved into the common code gen macro. No generated code change. Signed-off-by:
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Nicholas Piggin authored
No generated code change. Signed-off-by:
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Nicholas Piggin authored
No generated code change. Signed-off-by:
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Nicholas Piggin authored
The code generation macro arguments are difficult to read, and defaults can't easily be used. This introduces a block where parameters can be set for interrupt handler code generation by the subsequent macros, and adds the first generation macro for interrupt entry. One interrupt handler is converted to the new macros to demonstrate the change, the rest will be coverted all at once. No generated code change. Signed-off-by:
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Nicholas Piggin authored
Before: WARNING: CPU: 0 PID: 494 at arch/powerpc/kernel/irq.c:343 CPU: 0 PID: 494 Comm: a Tainted: G W NIP: c00000000001ed2c LR: c000000000d13190 CTR: c00000000003f910 REGS: c0000001fffd3870 TRAP: 0700 Tainted: G W MSR: 8000000000021003 <SF,ME,RI,LE> CR: 28000488 XER: 00000000 CFAR: c00000000001ec90 IRQMASK: 0 GPR00: c000000000aeb12c c0000001fffd3b00 c0000000012ba300 0000000000000000 GPR04: 0000000000000000 0000000000000000 000000010bd207c8 6b00696e74657272 GPR08: 0000000000000000 0000000000000000 0000000000000000 efbeadde00000000 GPR12: 0000000000000000 c0000000014a0000 0000000000000000 0000000000000000 GPR16: 0000000000000000 0000000000000000 0000000000000000 0000000000000000 GPR20: 0000000000000000 0000000000000000 0000000000000000 0000000000000000 GPR24: 0000000000000000 0000000000000000 0000000000000000 000000010bd207bc GPR28: 0000000000000000 c00000000148a898 0000000000000000 c0000001ffff3f50 NIP [c00000000001ed2c] arch_local_irq_restore.part.0+0xac/0x100 LR [c000000000d13190] _raw_spin_unlock_irqrestore+0x50/0xc0 Call Trace: Instruction dump: 60000000 7d2000a6 71298000 41820068 39200002 7d210164 4bffff9c 60000000 60000000 7d2000a6 71298000 4c820020 <0fe00000> 4e800020 60000000 60000000 After: WARNING: CPU: 0 PID: 499 at arch/powerpc/kernel/irq.c:343 CPU: 0 PID: 499 Comm: a Not tainted NIP: c00000000001ed2c LR: c000000000d13210 CTR: c00000000003f980 REGS: c0000001fffd3870 TRAP: 0700 Not tainted MSR: 8000000000021003 <SF,ME,RI,LE> CR: 28000488 XER: 00000000 CFAR: c00000000001ec90 IRQMASK: 0 GPR00: c000000000aeb1ac c0000001fffd3b00 c0000000012ba300 0000000000000000 GPR04: 0000000000000000 0000000000000000 00000001347607c8 6b00696e74657272 GPR08: 0000000000000000 0000000000000000 0000000000000000 efbeadde00000000 GPR12: 0000000000000000 c0000000014a0000 0000000000000000 0000000000000000 GPR16: 0000000000000000 0000000000000000 0000000000000000 0000000000000000 GPR20: 0000000000000000 0000000000000000 0000000000000000 0000000000000000 GPR24: 0000000000000000 0000000000000000 0000000000000000 00000001347607bc GPR28: 0000000000000000 c00000000148a898 0000000000000000 c0000001ffff3f50 NIP [c00000000001ed2c] arch_local_irq_restore.part.0+0xac/0x100 LR [c000000000d13210] _raw_spin_unlock_irqrestore+0x50/0xc0 Call Trace: [c0000001fffd3b20] [c000000000aeb1ac] of_find_property+0x6c/0x90 [c0000001fffd3b70] [c000000000aeb1f0] of_get_property+0x20/0x40 [c0000001fffd3b90] [c000000000042cdc] rtas_token+0x3c/0x70 [c0000001fffd3bb0] [c0000000000dc318] fwnmi_release_errinfo+0x28/0x70 [c0000001fffd3c10] [c0000000000dcd8c] pseries_machine_check_realmode+0x1dc/0x540 [c0000001fffd3cd0] [c00000000003fe04] machine_check_early+0x54/0x70 [c0000001fffd3d00] [c000000000008384] machine_check_early_common+0x134/0x1f0 --- interrupt: 200 at 0x1347607c8 LR = 0x7fffafbd8328 Instruction dump: 60000000 7d2000a6 71298000 41820068 39200002 7d210164 4bffff9c 60000000 60000000 7d2000a6 71298000 4c820020 <0fe00000> 4e800020 60000000 60000000 Signed-off-by: -
Michael Ellerman authored
In restore_tm_sigcontexts() we take the trap value directly from the user sigcontext with no checking: err |= __get_user(regs->trap, &sc->gp_regs[PT_TRAP]); This means we can be in the kernel with an arbitrary regs->trap value. Although that's not immediately problematic, there is a risk we could trigger one of the uses of CHECK_FULL_REGS(): #define CHECK_FULL_REGS(regs) BUG_ON(regs->trap & 1) It can also cause us to unnecessarily save non-volatile GPRs again in save_nvgprs(), which shouldn't be problematic but is still wrong. It's also possible it could trick the syscall restart machinery, which relies on regs->trap not being == 0xc00 (see 9a81c16b ("powerpc: fix double syscall restarts")), though I haven't been able to make that happen. Finally it doesn't match the behaviour of the non-TM case, in restore_sigcontext() which zeroes regs->trap. So change restore_tm_sigcontexts() to zero regs->trap. This was discovered while testing Nick's upcoming rewrite of the syscall entry path. In that series the call to save_nvgprs() prior to signal handling (do_notify_resume()) is removed, which leaves the low-bit of regs->trap uncleared which can then trigger the FULL_REGS() WARNs in setup_tm_sigcontexts(). Fixes: 2b0a576d ("powerpc: Add new transactional memory state to the signal context") Cc: stable@vger.kernel.org # v3.9+ Signed-off-by:
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- 27 Mar, 2020 3 commits
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Aneesh Kumar K.V authored
As per ISA an isync is only needed on instruction cache block invalidate. Remove the same from dcache invalidate. Signed-off-by:
Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com> Signed-off-by:
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Fangrui Song authored
.globl sets the symbol binding to STB_GLOBAL while .weak sets the binding to STB_WEAK. GNU as let .weak override .globl since binutils-gdb 5ca547dc2399a0a5d9f20626d4bf5547c3ccfddd (1996). Clang integrated assembler let the last win but it may error in the future. Since it is a convention that only one binding directive is used, just delete .globl. Fixes: ee9d21b3 ("powerpc/boot: Ensure _zimage_start is a weak symbol") Signed-off-by:
Fangrui Song <maskray@google.com> Signed-off-by:
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Ganesh Goudar authored
memcpy_mcsafe has been implemented for power machines which is used by pmem infrastructure, so that an UE encountered during memcpy from pmem devices would not result in panic instead a right error code is returned. The implementation expects machine check handler to ignore the event and set nip to continue the execution from fixup code. Appropriate changes are already made to powernv machine check handler, make similar changes to pseries machine check handler to ignore the the event and set nip to continue execution at the fixup entry if we hit UE at an instruction with a fixup entry. while we are at it, have a common function which searches the exception table entry and updates nip with fixup address, and any future common changes can be made in this function that are valid for both architectures. powernv changes are made by commit 895e3dce ("powerpc/mce: Handle UE event for memcpy_mcsafe") Reviewed-by:
Mahesh Salgaonkar <mahesh@linux.vnet.ibm.com> Reviewed-by:
Santosh S <santosh@fossix.org> Signed-off-by:
Ganesh Goudar <ganeshgr@linux.ibm.com> Signed-off-by:
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- 26 Mar, 2020 17 commits
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Michael Ellerman authored
We can avoid the #ifdef by using IS_ENABLED() in the existing condition check. Signed-off-by:
Srikar Dronamraju <srikar@linux.vnet.ibm.com> Signed-off-by:
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Michael Ellerman authored
We don't need the NULL check of np, the result is the same because the OF helpers cope with NULL, of_node_to_nid(NULL) == NUMA_NO_NODE (-1). Signed-off-by:
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Michael Ellerman authored
It's over 10 years since the last commit from Vitaly, so I suspect he's moved on to other things. Christophe has been the primary contributor to 8xx in the last several years, so anoint him as the maintainer. Remove the dead penguingppc.org link. Signed-off-by:
Christophe Leroy <christophe.leroy@c-s.fr> Link: https://lore.kernel.org/r/20200225092534.9587-1-mpe@ellerman.id.au
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Michael Ellerman authored
Scott said he was still maintaining this "sort of", so change the status to Odd Fixes. Kumar has long ago moved on to greener pastures. Remove the dead penguinppc.org link. Signed-off-by:
Scott Wood <oss@buserror.net> Link: https://lore.kernel.org/r/20200224233146.23734-8-mpe@ellerman.id.au
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Michael Ellerman authored
Ben is no longer actively maintaining the powermac code, but we know where to find him if something really needs attention. The www.penguinppc.org link is dead so remove it. Signed-off-by:
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Michael Ellerman authored
It's several years since the last commit from Anatolij, so mark MPC5XXX as "Odd Fixes" rather than "Maintained". Also the git link no longer works so remove it. Signed-off-by:
Anatolij Gustschin <agust@denx.de> Link: https://lore.kernel.org/r/20200224233146.23734-6-mpe@ellerman.id.au
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Michael Ellerman authored
This has been orphaned for ~7 years, remove it. Signed-off-by:
Grant Likely <grant.likely@arm.com> Link: https://lore.kernel.org/r/20200224233146.23734-5-mpe@ellerman.id.au
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Michael Ellerman authored
The 4xx platforms are no longer maintained. Signed-off-by:
Alistair Popple <alistair@popple.id.au> Link: https://lore.kernel.org/r/20200224233146.23734-4-mpe@ellerman.id.au
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Michael Ellerman authored
The PA SEMI entries have been orphaned for 3 ½ years, so fold them into the main POWERPC entry. The result of get_maintainer.pl is more or less unchanged. Signed-off-by:
Olof Johansson <olof@lixom.net> Link: https://lore.kernel.org/r/20200224233146.23734-3-mpe@ellerman.id.au
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Michael Ellerman authored
The wiki has moved, update the link. Signed-off-by:
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Michael Ellerman authored
A while back Paul pointed out I'd been maintaining the tree more or less solo for over five years, so perhaps it's time to update the MAINTAINERS entry. Ben & Paul still wrote most of the code, so keep them as Reviewers so they still get Cc'ed on things. But if you're wondering why your patch hasn't been merged that's my fault. Signed-off-by:
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Douglas Miller authored
The reason debuggers add an ASCII dump to other types of memory dumps is to give the user visual reference points in the case that ASCII strings are adjacent to other structures or element. For example, when examining the task_struct structure one can look for the comm[] string and use it to locate other important elements. ASCII strings do not have endianess, they exist in memory in the same order regardless of CPU endianess. ASCII strings are, by definition, human readable and so should be presented in a human readable format. For these reasons, the supplemental ASCII dump does not re-order the strings from memory to match the endianess of the corresponding 16, 32, or 64 bit words. That would make the ASCII dump much less useful. Signed-off-by:
Douglas Miller <dougmill@linux.vnet.ibm.com> Signed-off-by:
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Cédric Le Goater authored
As does XMON, the debugfs file /sys/kernel/debug/powerpc/xive exposes the XIVE internal state of the machine CPUs and interrupts. Available on the PowerNV and sPAPR platforms. Signed-off-by:
Cédric Le Goater <clg@kaod.org> [mpe: Make the debugfs file 0400] Signed-off-by:
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Cédric Le Goater authored
Some firmwares or hypervisors can advertise different source characteristics. Track their value under XMON. What we are mostly interested in is the StoreEOI flag. Signed-off-by:
Greg Kurz <groug@kaod.org> Signed-off-by:
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Cédric Le Goater authored
The PowerNV platform has multiple IRQ chips and the xmon command dumping the state of the XIVE interrupt should only operate on the XIVE IRQ chip. Fixes: 5896163f ("powerpc/xmon: Improve output of XIVE interrupts") Cc: stable@vger.kernel.org # v5.4+ Signed-off-by:
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Cédric Le Goater authored
When a CPU is brought up, an IPI number is allocated and recorded under the XIVE CPU structure. Invalid IPI numbers are tracked with interrupt number 0x0. On the PowerNV platform, the interrupt number space starts at 0x10 and this works fine. However, on the sPAPR platform, it is possible to allocate the interrupt number 0x0 and this raises an issue when CPU 0 is unplugged. The XIVE spapr driver tracks allocated interrupt numbers in a bitmask and it is not correctly updated when interrupt number 0x0 is freed. It stays allocated and it is then impossible to reallocate. Fix by using the XIVE_BAD_IRQ value instead of zero on both platforms. Reported-by:
David Gibson <david@gibson.dropbear.id.au> Fixes: eac1e731 ("powerpc/xive: guest exploitation of the XIVE interrupt controller") Cc: stable@vger.kernel.org # v4.14+ Signed-off-by:
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Nick Desaulniers authored
Reported-by:
Sedat Dilek <sedat.dilek@gmail.com> Suggested-by:
Josh Poimboeuf <jpoimboe@redhat.com> Signed-off-by:
Nick Desaulniers <ndesaulniers@google.com> [mpe: Drop changes to a/p/boot which doesn't use linux headers] Signed-off-by:
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- 25 Mar, 2020 8 commits
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Fabiano Rosas authored
The if statement that this comment referred to was removed in commit 11fdb309 ("powerpc/prom_init: Remove support for OPAL v2"). Signed-off-by:
Fabiano Rosas <farosas@linux.ibm.com> Signed-off-by:
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Christophe Leroy authored
When a program check exception happens while MMU translation is disabled, following Oops happens in kprobe_handler() in the following code: } else if (*addr != BREAKPOINT_INSTRUCTION) { BUG: Unable to handle kernel data access on read at 0x0000e268 Faulting instruction address: 0xc000ec34 Oops: Kernel access of bad area, sig: 11 [#1] BE PAGE_SIZE=16K PREEMPT CMPC885 Modules linked in: CPU: 0 PID: 429 Comm: cat Not tainted 5.6.0-rc1-s3k-dev-00824-g84195dc6c58a #3267 NIP: c000ec34 LR: c000ecd8 CTR: c019cab8 REGS: ca4d3b58 TRAP: 0300 Not tainted (5.6.0-rc1-s3k-dev-00824-g84195dc6c58a) MSR: 00001032 <ME,IR,DR,RI> CR: 2a4d3c52 XER: 00000000 DAR: 0000e268 DSISR: c0000000 GPR00: c000b09c ca4d3c10 c66d0620 00000000 ca4d3c60 00000000 00009032 00000000 GPR08: 00020000 00000000 c087de44 c000afe0 c66d0ad0 100d3dd6 fffffff3 00000000 GPR16: 00000000 00000041 00000000 ca4d3d70 00000000 00000000 0000416d 00000000 GPR24: 00000004 c53b6128 00000000 0000e268 00000000 c07c0000 c07bb6fc ca4d3c60 NIP [c000ec34] kprobe_handler+0x128/0x290 LR [c000ecd8] kprobe_handler+0x1cc/0x290 Call Trace: [ca4d3c30] [c000b09c] program_check_exception+0xbc/0x6fc [ca4d3c50] [c000e43c] ret_from_except_full+0x0/0x4 --- interrupt: 700 at 0xe268 Instruction dump: 913e0008 81220000 38600001 3929ffff 91220000 80010024 bb410008 7c0803a6 38210020 4e800020 38600000 4e800020 <813b0000> 6d2a7fe0 2f8a0008 419e0154 ---[ end trace 5b9152d4cdadd06d ]--- kprobe is not prepared to handle events in real mode and functions running in real mode should have been blacklisted, so kprobe_handler() can safely bail out telling 'this trap is not mine' for any trap that happened while in real-mode. If the trap happened with MSR_IR or MSR_DR cleared, return 0 immediately. Reported-by:Larry Finger <Larry.Finger@lwfinger.net> Fixes: 6cc89bad ("powerpc/kprobes: Invoke handlers directly") Cc: stable@vger.kernel.org # v4.10+ Signed-off-by:
Masami Hiramatsu <mhiramat@kernel.org> Reviewed-by:
Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com> Signed-off-by:
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Nathan Chancellor authored
When building ppc64 defconfig, Clang errors (trimmed for brevity): arch/powerpc/platforms/maple/setup.c:365:1: error: attribute declaration must precede definition [-Werror,-Wignored-attributes] machine_device_initcall(maple, maple_cpc925_edac_setup); ^ machine_device_initcall expands to __define_machine_initcall, which in turn has the macro machine_is used in it, which declares mach_##name with an __attribute__((weak)). define_machine actually defines mach_##name, which in this file happens before the declaration, hence the warning. To fix this, move define_machine after machine_device_initcall so that the declaration occurs before the definition, which matches how machine_device_initcall and define_machine work throughout arch/powerpc. While we're here, remove some spaces before tabs. Fixes: 8f101a05 ("edac: cpc925 MC platform device setup") Reported-by:
Ilie Halip <ilie.halip@gmail.com> Signed-off-by:
Nathan Chancellor <natechancellor@gmail.com> Signed-off-by:
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Nicholas Piggin authored
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Oliver O'Halloran authored
With the EEH early probe now being pseries specific there's no need for eeh_ops->probe() to take a pci_dn. Instead, we can make it take a pci_dev and use the probe function to map a pci_dev to an eeh_dev. This allows the platform to implement it's own method for finding (or creating) an eeh_dev for a given pci_dev which also removes a use of pci_dn in generic EEH code. This patch also renames eeh_device_add_late() to eeh_device_probe(). This better reflects what it does does and removes the last vestiges of the early/late EEH probe split. Reviewed-by:
Sam Bobroff <sbobroff@linux.ibm.com> Signed-off-by:
Oliver O'Halloran <oohall@gmail.com> Signed-off-by:
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Oliver O'Halloran authored
The eeh_ops->probe() function is called from two different contexts: 1. On pseries, where we set EEH_PROBE_MODE_DEVTREE, it's called in eeh_add_device_early() which is supposed to run before we create a pci_dev. 2. On PowerNV, where we set EEH_PROBE_MODE_DEV, it's called in eeh_device_add_late() which is supposed to run *after* the pci_dev is created. The "early" probe is required because PAPR requires that we perform an RTAS call to enable EEH support on a device before we start interacting with it via config space or MMIO. This requirement doesn't exist on PowerNV and shoehorning two completely separate initialisation paths into a common interface just results in a convoluted code everywhere. Additionally the early probe requires the probe function to take an pci_dn rather than a pci_dev argument. We'd like to make pci_dn a pseries specific data structure since there's no real requirement for them on PowerNV. To help both goals move the early probe into the pseries containment zone so the platform depedence is more explicit. Reviewed-by:
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Oliver O'Halloran authored
This check for a missing PHB has existing in various forms since the initial PPC64 port was upstreamed in 2002. The idea seems to be that we need to guard against creating pci-specific data structures for the non-pci children of a PCI device tree node (e.g. USB devices). However, we only create pci_dn structures for DT nodes that correspond to PCI devices so there's not much point in doing this check in the eeh_probe path. Reviewed-by:
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Oliver O'Halloran authored
The pci hotplug helper (pci_hp_add_devices()) calls eeh_add_device_tree_early() to scan the device-tree for new PCI devices and do the early EEH probe before the device is scanned. This early probe is a no-op in a lot of cases because: a) The early init is only required to satisfy a PAPR requirement that EEH be configured before we start doing config accesses. On PowerNV it is a no-op. b) It's a no-op for devices that have already had their eeh_dev initialised. There are four callers of pci_hp_add_devices(): 1. arch/powerpc/kernel/eeh_driver.c Here the hotplug helper is called when re-scanning pci_devs that were removed during an EEH recovery pass. The EEH stat for each removed device (the eeh_dev) is retained across a recovery pass so the early init is a no-op in this case. 2. drivers/pci/hotplug/pnv_php.c This is also a no-op since the PowerNV hotplug driver is, suprisingly, PowerNV specific. 3. drivers/pci/hotplug/rpaphp_core.c 4. drivers/pci/hotplug/rpaphp_pci.c In these two cases new devices have been hotplugged and FW has provided new DT nodes for each. These are the only two cases where the EEH we might have new PCI device nodes in the DT so these are the only two cases where the early EEH probe needs to be done. We can move the calls to eeh_add_device_tree_early() to the locations where it's needed and remove it from the generic path. This is preparation for making the early EEH probe pseries specific. Reviewed-by:
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