- 03 Apr, 2021 7 commits
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Christophe Leroy authored
Commit 6bfd93c3 ("powerpc: Fix incorrect might_sleep in __get_user/__put_user on kernel addresses") added a check to not call might_sleep() on kernel addresses. This was to enable the use of __get_user() in the alignment exception handler for any address. Then commit 95156f00 ("lockdep, mm: fix might_fault() annotation") added a check of the address space in might_fault(), based on set_fs() logic. But this didn't solve the powerpc alignment exception case as it didn't call set_fs(KERNEL_DS). Nowadays, set_fs() is gone, previous patch fixed the alignment exception handler and __get_user/__put_user are not supposed to be used anymore to read kernel memory. Therefore the is_kernel_addr() check has become useless and can be removed. Signed-off-by:
Christophe Leroy <christophe.leroy@csgroup.eu> Reviewed-by:
Daniel Axtens <dja@axtens.net> Signed-off-by:
Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/e0a980a4dc7a2551183dd5cb30f46eafdbee390c.1615398265.git.christophe.leroy@csgroup.eu
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Christophe Leroy authored
In the old days, when we didn't have kernel userspace access protection and had set_fs(), it was wise to use __get_user() and friends to read kernel memory. Nowadays, get_user() is granting userspace access and is exclusively for userspace access. In alignment exception handler, use probe_kernel_read_inst() instead of __get_user_instr() for reading instructions in kernel. This will allow to remove the is_kernel_addr() check in __get/put_user() in a following patch. Signed-off-by:
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Christophe Leroy authored
Those helpers use get_user helpers but they don't participate in their implementation, so they do not belong to asm/uaccess.h Move them in asm/inst.h Signed-off-by:
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Christophe Leroy authored
Powerpc is the only architecture having _inatomic variants of __get_user() and __put_user() accessors. They were introduced by commit e68c825b ("[POWERPC] Add inatomic versions of __get_user and __put_user"). Those variants expand to the _nosleep macros instead of expanding to the _nocheck macros. The only difference between the _nocheck and the _nosleep macros is the call to might_fault(). Since commit 662bbcb2 ("mm, sched: Allow uaccess in atomic with pagefault_disable()"), __get/put_user() can be used in atomic parts of the code, therefore __get/put_user_inatomic() have become useless. Remove __get_user_inatomic() and __put_user_inatomic(). Signed-off-by:
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Christophe Leroy authored
This patch converts emulate_spe() to using user_access_begin logic. Since commit 662bbcb2 ("mm, sched: Allow uaccess in atomic with pagefault_disable()"), might_fault() doesn't fire when called from sections where pagefaults are disabled, which must be the case when using _inatomic variants of __get_user and __put_user. So the might_fault() in user_access_begin() is not a problem. There was a verification of user_mode() together with the access_ok(), but there is a second verification of user_mode() just after, that leads to immediate return. The access_ok() is now part of the user_access_begin which is called after that other user_mode() verification, so no need to check user_mode() again. Signed-off-by:
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Christophe Leroy authored
Define simple ___get_user_instr() for ppc32 instead of defining ppc32 versions of the three get_user_instr() helpers. Signed-off-by:
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Christophe Leroy authored
Those two macros have only one user which is unsafe_get_user(). Put everything in one place and remove them. Signed-off-by:
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- 31 Mar, 2021 2 commits
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Aneesh Kumar K.V authored
This reverts commit 675bceb0 ("powerpc/mm: Remove DEBUG_VM_PGTABLE support on powerpc") All the related issues are fixed as of commit: f14312e1 ("mm/debug_vm_pgtable: avoid doing memory allocation with pgtable_t mapped.") Hence re-enable it. Signed-off-by:
Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com> Signed-off-by:
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Michael Ellerman authored
The vio bus is a fake bus, which we use on pseries LPARs (guests) to discover devices provided by the hypervisor. There's no need or sense in creating the vio bus on bare metal systems. Which is why commit 4336b933 ("powerpc/pseries: Make vio and ibmebus initcalls pseries specific") made the initialisation of the vio bus only happen in LPARs. However as a result of that commit we now see errors at boot on bare metal systems: Driver 'hvc_console' was unable to register with bus_type 'vio' because the bus was not initialized. Driver 'tpm_ibmvtpm' was unable to register with bus_type 'vio' because the bus was not initialized. This happens because those drivers are built-in, and are calling vio_register_driver(). It in turn calls driver_register() with a reference to vio_bus_type, but we haven't registered vio_bus_type with the driver core. Fix it by also guarding vio_register_driver() with a check to see if we are on pseries. Fixes: 4336b933 ("powerpc/pseries: Make vio and ibmebus initcalls pseries specific") Reported-by:
Paul Menzel <pmenzel@molgen.mpg.de> Signed-off-by:
Tyrel Datwyler <tyreld@linux.ibm.com> Link: https://lore.kernel.org/r/20210316010938.525657-1-mpe@ellerman.id.au
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- 29 Mar, 2021 31 commits
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dingsenjie authored
Remove unneeded variable: "rc". Signed-off-by:
dingsenjie <dingsenjie@yulong.com> Reviewed-by:
Andrew Donnellan <ajd@linux.ibm.com> Signed-off-by:
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Chen Huang authored
When compiling the powerpc with the SMP disabled, it shows the issue: arch/powerpc/kernel/watchdog.c: In function ‘watchdog_smp_panic’: arch/powerpc/kernel/watchdog.c:177:4: error: implicit declaration of function ‘smp_send_nmi_ipi’; did you mean ‘smp_send_stop’? [-Werror=implicit-function-declaration] 177 | smp_send_nmi_ipi(c, wd_lockup_ipi, 1000000); | ^~~~~~~~~~~~~~~~ | smp_send_stop cc1: all warnings being treated as errors make[2]: *** [scripts/Makefile.build:273: arch/powerpc/kernel/watchdog.o] Error 1 make[1]: *** [scripts/Makefile.build:534: arch/powerpc/kernel] Error 2 make: *** [Makefile:1980: arch/powerpc] Error 2 make: *** Waiting for unfinished jobs.... We found that powerpc used ipi to implement hardlockup watchdog, so the HAVE_HARDLOCKUP_DETECTOR_ARCH should depend on the SMP. Fixes: 2104180a ("powerpc/64s: implement arch-specific hardlockup watchdog") Reported-by:Hulk Robot <hulkci@huawei.com> Signed-off-by:
Chen Huang <chenhuang5@huawei.com> Signed-off-by:
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Daniel Henrique Barboza authored
One of the reasons that dlpar_cpu_offline can fail is when attempting to offline the last online CPU of the kernel. This can be observed in a pseries QEMU guest that has hotplugged CPUs. If the user offlines all other CPUs of the guest, and a hotplugged CPU is now the last online CPU, trying to reclaim it will fail. The current error message in this situation returns rc with -EBUSY and a generic explanation, e.g.: pseries-hotplug-cpu: Failed to offline CPU PowerPC,POWER9, rc: -16 EBUSY can be caused by other conditions, such as cpu_hotplug_disable being true. Throwing a more specific error message for this case, instead of just "Failed to offline CPU", makes it clearer that the error is in fact a known error situation instead of other generic/unknown cause. This patch adds a 'last online' check in dlpar_cpu_offline() to catch the 'last online CPU' offline error, eturning a more informative error message: pseries-hotplug-cpu: Unable to remove last online CPU PowerPC,POWER9 Signed-off-by:
Daniel Henrique Barboza <danielhb413@gmail.com> Signed-off-by:
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Randy Dunlap authored
Drop the 'beginning of kernel-doc' notation markers (/**) in places that are not in kernel-doc format. Signed-off-by:
Randy Dunlap <rdunlap@infradead.org> Reviewed-by:
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Bhaskar Chowdhury authored
s/filesytem/filesystem/ s/symantics/semantics/ Signed-off-by:
Bhaskar Chowdhury <unixbhaskar@gmail.com> Acked-by:
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Christophe Leroy authored
call_do_irq() and call_do_softirq() are simple enough to be worth inlining. Inlining them avoids an mflr/mtlr pair plus a save/reload on stack. This is inspired from S390 arch. Several other arches do more or less the same. The way sparc arch does seems odd thought. Signed-off-by:
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He Ying authored
Sparse warns: warning: symbol 'rfi_flush' was not declared. warning: symbol 'entry_flush' was not declared. warning: symbol 'uaccess_flush' was not declared. Define 'entry_flush' and 'uaccess_flush' as static because they are not referenced outside the file. Include asm/security_features.h in which 'rfi_flush' is declared. Reported-by:
He Ying <heying24@huawei.com> Reviewed-by:
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Christophe Leroy authored
Commit 92c8c16f ("powerpc/embedded6xx: Remove C2K board support") moved the last selector of CONFIG_MV64X60. As it is not a user selectable config, it can be removed. Signed-off-by:
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kernel test robot authored
arch/powerpc/kernel/iommu.c:76:2-16: WARNING: NULL check before some freeing functions is not needed. NULL check before some freeing functions is not needed. Based on checkpatch warning "kfree(NULL) is safe this check is probably not required" and kfreeaddr.cocci by Julia Lawall. Generated by: scripts/coccinelle/free/ifnullfree.cocci Fixes: 691602aa ("powerpc/iommu/debug: Add debugfs entries for IOMMU tables") Reported-by:
kernel test robot <lkp@intel.com> Signed-off-by:
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Christophe Leroy authored
It seems like other architectures, namely x86 and arm64 and riscv at least, include the running function as top entry when saving stack trace with save_stack_trace_regs(). Functionnalities like KFENCE expect it. Do the same on powerpc, it allows KFENCE and other users to properly identify the faulting function as depicted below. Before the patch KFENCE was identifying finish_task_switch.isra as the faulting function. [ 14.937370] ================================================================== [ 14.948692] BUG: KFENCE: invalid read in test_invalid_access+0x54/0x108 [ 14.948692] [ 14.956814] Invalid read at 0xdf98800a: [ 14.960664] test_invalid_access+0x54/0x108 [ 14.964876] finish_task_switch.isra.0+0x54/0x23c [ 14.969606] kunit_try_run_case+0x5c/0xd0 [ 14.973658] kunit_generic_run_threadfn_adapter+0x24/0x30 [ 14.979079] kthread+0x15c/0x174 [ 14.982342] ret_from_kernel_thread+0x14/0x1c [ 14.986731] [ 14.988236] CPU: 0 PID: 111 Comm: kunit_try_catch Tainted: G B 5.12.0-rc1-01537-g95f6e2088d7e-dirty #4682 [ 14.999795] NIP: c016ec2c LR: c02f517c CTR: c016ebd8 [ 15.004851] REGS: e2449d90 TRAP: 0301 Tainted: G B (5.12.0-rc1-01537-g95f6e2088d7e-dirty) [ 15.015274] MSR: 00009032 <EE,ME,IR,DR,RI> CR: 22000004 XER: 00000000 [ 15.022043] DAR: df98800a DSISR: 20000000 [ 15.022043] GPR00: c02f517c e2449e50 c1142080 e100dd24 c084b13c 00000008 c084b32b c016ebd8 [ 15.022043] GPR08: c0850000 df988000 c0d10000 e2449eb0 22000288 [ 15.040581] NIP [c016ec2c] test_invalid_access+0x54/0x108 [ 15.046010] LR [c02f517c] kunit_try_run_case+0x5c/0xd0 [ 15.051181] Call Trace: [ 15.053637] [e2449e50] [c005a68c] finish_task_switch.isra.0+0x54/0x23c (unreliable) [ 15.061338] [e2449eb0] [c02f517c] kunit_try_run_case+0x5c/0xd0 [ 15.067215] [e2449ed0] [c02f648c] kunit_generic_run_threadfn_adapter+0x24/0x30 [ 15.074472] [e2449ef0] [c004e7b0] kthread+0x15c/0x174 [ 15.079571] [e2449f30] [c001317c] ret_from_kernel_thread+0x14/0x1c [ 15.085798] Instruction dump: [ 15.088784] 8129d608 38e7ebd8 81020280 911f004c 39000000 995f0024 907f0028 90ff001c [ 15.096613] 3949000a 915f0020 3d40c0d1 3d00c085 <8929000a> 3908adb0 812a4b98 3d40c02f [ 15.104612] ================================================================== Fixes: 35de3b1a ("powerpc: Implement save_stack_trace_regs() to enable kprobe stack tracing") Signed-off-by:
Marco Elver <elver@google.com> Signed-off-by:
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Christophe Leroy authored
This patch converts powerpc stacktrace to the generic ARCH_STACKWALK implemented by commit 214d8ca6 ("stacktrace: Provide common infrastructure") Signed-off-by:
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Christophe Leroy authored
To better match generic code, rename 'tsk' to 'task' in some stacktrace functions in preparation of following patch which converts powerpc to generic ARCH_STACKWALK. Signed-off-by:
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Christophe Leroy authored
CONFIG_HAVE_RELIABLE_STACKTRACE is applicable to all, no reason to limit it to book3s/64le Signed-off-by:
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Aneesh Kumar K.V authored
With below two commits: commit c91435d9 ("powerpc/book3s64/hash/kuep: Enable KUEP on hash") commit b2ff33a1 ("powerpc/book3s64/hash/kuap: Enable kuap on hash") the kernel now supports kuap/kuep with hash translation. Hence select the Kconfig even when radix is disabled. Signed-off-by:
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Bhaskar Chowdhury authored
s/procesing/processing/ Signed-off-by:
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Nicholas Piggin authored
Hash faults use the trap vector to decide whether this is an instruction or data fault. This should use the TRAP accessor rather than open access regs->trap. This won't cause a problem at the moment because 64s only uses trap flags for system call interrupts (the norestart flag), but that could change if any other trap flags get used in future. Fixes: a4922f54 ("powerpc/64s: move the hash fault handling logic to C") Suggested-by:
Nicholas Piggin <npiggin@gmail.com> Signed-off-by:
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Christophe Leroy authored
In fault.c, #ifdef CONFIG_PPC_MEM_KEYS is not needed because all functions are always defined, and arch_vma_access_permitted() always returns true when CONFIG_PPC_MEM_KEYS is not defined so access_pkey_error() will return false so bad_access_pkey() will never be called. Include linux/pkeys.h to get a definition of vma_pkeys() for bad_access_pkey(). Signed-off-by:
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Michael Ellerman authored
Section mismatch in reference from the function .fsl_add_bridge() to the function .init.text:.setup_pci_cmd() fsl_add_bridge() is not __init, and can't be, and is the only caller of setup_pci_cmd(). Fix it by making setup_pci_cmd() non-init. Signed-off-by:
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Michael Ellerman authored
Section mismatch in reference from the function .smp_setup_pacas() to the function .init.text:.allocate_paca() The only caller of smp_setup_pacas() is setup_arch() which is __init, so mark smp_setup_pacas() __init. Signed-off-by:
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Michael Ellerman authored
lkp reported warnings in some configuration due to update_current_thread_amr() being unused: arch/powerpc/mm/book3s64/pkeys.c:284:20: error: unused function 'update_current_thread_amr' static inline void update_current_thread_amr(u64 value) Which is because it's only use is inside an ifdef. We could move it inside the ifdef, but it's a single line function and only has one caller, so just fold it in. Similarly update_current_thread_iamr() is small and only called once, so fold it in also. Fixes: 48a8ab4e ("powerpc/book3s64/pkeys: Don't update SPRN_AMR when in kernel mode.") Reported-by:
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Michael Ellerman authored
The build fails with CONFIG_PROC_FS=n: arch/powerpc/kernel/eeh.c:1571:12: error: ‘proc_eeh_show’ defined but not used 1571 | static int proc_eeh_show(struct seq_file *m, void *v) Wrap proc_eeh_show() in an ifdef to avoid it. Signed-off-by:
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Jiapeng Chong authored
Fix the following coccicheck warning: ./arch/powerpc/platforms/maple/pci.c:37:16-17: WARNING comparing pointer to 0. Reported-by:
Abaci Robot <abaci@linux.alibaba.com> Signed-off-by:
Jiapeng Chong <jiapeng.chong@linux.alibaba.com> Signed-off-by:
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Yang Li authored
fixed the following coccicheck: ./arch/powerpc/sysdev/xive/spapr.c:552:8-9: WARNING: return of 0/1 in function 'xive_spapr_match' with return type bool Reported-by:
Yang Li <yang.lee@linux.alibaba.com> Signed-off-by:
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Christophe Leroy authored
Commit aac6a91f ("powerpc/asm: Remove unused symbols in asm-offsets.c") removed GPR15 to GPR31 but kept GPR14, probably because it pops up in a couple of comments when doing a grep. However, it was never used either, so remove it as well. Fixes: aac6a91f ("powerpc/asm: Remove unused symbols in asm-offsets.c") Signed-off-by:
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Christophe Leroy authored
Sparse reports the following problems: arch/powerpc/math-emu/math.c:228:21: warning: Using plain integer as NULL pointer arch/powerpc/math-emu/math.c:228:31: warning: Using plain integer as NULL pointer arch/powerpc/math-emu/math.c:228:41: warning: Using plain integer as NULL pointer arch/powerpc/math-emu/math.c:228:51: warning: Using plain integer as NULL pointer arch/powerpc/math-emu/math.c:237:13: warning: incorrect type in initializer (different address spaces) arch/powerpc/math-emu/math.c:237:13: expected unsigned int [noderef] __user *_gu_addr arch/powerpc/math-emu/math.c:237:13: got unsigned int [usertype] * arch/powerpc/math-emu/math.c:226:1: warning: symbol 'do_mathemu' was not declared. Should it be static? Add missing __user qualifier when casting pointer used in get_user() Use NULL instead of 0 to initialise opX local variables. Add a prototype for do_mathemu() (Added in processor.h like sparc) Reported-by:
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Bhaskar Chowdhury authored
s/detalis/details/ Signed-off-by:
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Bhaskar Chowdhury authored
Trivial spelling fixes throughout the file. Signed-off-by:
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Christophe Leroy authored
Commit 6ec4476a ("Raise gcc version requirement to 4.9") made it impossible to build with gcc 4.8 and under. Remove related workaround. Signed-off-by:
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Christophe Leroy authored
Move all KUAP management in C. Signed-off-by:
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Christophe Leroy authored
In preparation of porting PPC32 to C syscall entry/exit, create C version of kuap_save_and_lock() and kuap_user_restore() and kuap_kernel_restore() and kuap_assert_locked() and kuap_get_and_assert_locked() on 8xx. Signed-off-by:
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Christophe Leroy authored
In preparation of porting PPC32 to C syscall entry/exit, create C version of kuap_save_and_lock() and kuap_user_restore() and kuap_kernel_restore() and kuap_assert_locked() and kuap_get_and_assert_locked() on book3s/32. Signed-off-by:
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