- 03 Dec, 2020 40 commits
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Athira Rajeev authored
The power_pmu_event_init() callback access per-cpu variable (cpu_hw_events) to check for event constraints and Branch Stack (BHRB). Current usage is to disable preemption when accessing the per-cpu variable, but this does not prevent timer callback from interrupting event_init. Fix this by using 'local_irq_save/restore' to make sure the code path is invoked with disabled interrupts. This change is tested in mambo simulator to ensure that, if a timer interrupt comes in during the per-cpu access in event_init, it will be soft masked and replayed later. For testing purpose, introduced a udelay() in power_pmu_event_init() to make sure a timer interrupt arrives while in per-cpu variable access code between local_irq_save/resore. As expected the timer interrupt was replayed later during local_irq_restore called from power_pmu_event_init. This was confirmed by adding breakpoint in mambo and checking the backtrace when timer_interrupt was hit. Reported-by:
Sebastian Andrzej Siewior <bigeasy@linutronix.de> Signed-off-by:
Athira Rajeev <atrajeev@linux.vnet.ibm.com> Signed-off-by:
Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/1606814880-1720-1-git-send-email-atrajeev@linux.vnet.ibm.com
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Harish authored
Patch fixes uninitialized variable warning in bad_accesses test which causes the selftests build to fail in older distibutions bad_accesses.c: In function ‘bad_access’: bad_accesses.c:52:9: error: ‘x’ may be used uninitialized in this function [-Werror=maybe-uninitialized] printf("Bad - no SEGV! (%c)\n", x); ^ cc1: all warnings being treated as errors Signed-off-by:Harish <harish@linux.ibm.com> Signed-off-by:
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Daniel Axtens authored
I did an in-place build of the self-tests and found that it left the tree dirty. Add missed test binaries to .gitignore Signed-off-by:
Daniel Axtens <dja@axtens.net> Signed-off-by:
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Daniel Axtens authored
In a bunch of our security flushes, we use a comma rather than a semicolon to 'terminate' an assignment. Nothing breaks, but checkpatch picks it up if you copy it into another flush. Switch to semicolons for ending statements. Signed-off-by:
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Frederic Barrat authored
Update bus speed definition for PCI Gen4 and 5. Signed-off-by:
Frederic Barrat <fbarrat@linux.ibm.com> Signed-off-by:
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Jordan Niethe authored
This enables GENERIC_BUG_RELATIVE_POINTERS on Power so that 32-bit offsets are stored in the bug entries rather than 64-bit pointers. While this doesn't save space for 32-bit machines, use it anyway so there is only one code path. Signed-off-by:
Jordan Niethe <jniethe5@gmail.com> Reviewed-by:
Christophe Leroy <christophe.leroy@csgroup.eu> Signed-off-by:
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Ravi Bangoria authored
With CONFIG_PPC_8xx and CONFIG_XMON set, kernel build fails with arch/powerpc/xmon/xmon.c:1379:12: error: 'find_free_data_bpt' defined but not used [-Werror=unused-function] Fix it by enclosing find_free_data_bpt() inside #ifndef CONFIG_PPC_8xx. Fixes: 30df74d6 ("powerpc/watchpoint/xmon: Support 2nd DAWR") Reported-by:
kernel test robot <lkp@intel.com> Signed-off-by:
Ravi Bangoria <ravi.bangoria@linux.ibm.com> Signed-off-by:
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Youling Tang authored
Use the common STABS_DEBUG and DWARF_DEBUG and ELF_DETAILS macro rule for the linker script in an effort. Signed-off-by:
Youling Tang <tangyouling@loongson.cn> Signed-off-by:
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Jordan Niethe authored
Commit 63ce271b ("powerpc/prom: convert PROM_BUG() to standard trap") added an EMIT_BUG_ENTRY for the trap after the branch to start_kernel(). The EMIT_BUG_ENTRY was for the address "0b", however the trap was not labeled with "0". Hence the address used for bug is in relative_toc() where the previous "0" label is. Label the trap as "0" so the correct address is used. Fixes: 63ce271b ("powerpc/prom: convert PROM_BUG() to standard trap") Signed-off-by:
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Christophe Leroy authored
Rename the guard define to _ASM_POWERPC_VDSO_H And remove useless #ifdef __KERNEL__ Signed-off-by:
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Christophe Leroy authored
VDSO32_LBASE and VDSO64_LBASE are 0. Remove them to simplify code. Signed-off-by:
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Christophe Leroy authored
DBG() is not used anymore. Remove it. Signed-off-by:
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Christophe Leroy authored
There is no way to get out of vdso_init() prematuraly anymore. Remove vdso_ready as it will always be 1. Signed-off-by:
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Christophe Leroy authored
vdso_fixup_features() cannot fail anymore and that's the only function called by vdso_setup(). vdso_setup() has become trivial and can be removed. Signed-off-by:
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Christophe Leroy authored
lib32_elfinfo and lib64_elfinfo are not used anymore, remove them. Also remove vdso32_kbase and vdso64_kbase while removing the last use. Signed-off-by:
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Christophe Leroy authored
The members related to the symbol section in struct lib32_elfinfo and struct lib64_elfinfo are not used anymore, removed them. Signed-off-by:
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Christophe Leroy authored
The text member in struct lib32_elfinfo and struct lib64_elfinfo is not used, remove it. Signed-off-by:
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Christophe Leroy authored
vdso_patches[] is now empty, remove it and remove all functions that depends on it. Signed-off-by:
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Christophe Leroy authored
Signal trampoline offsets are now generated at buildtime. Runtime generated offsets are not used anymore, remove them. Signed-off-by:
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Christophe Leroy authored
__kernel_datapage_offset is not used anymore, remove it. Signed-off-by:
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Christophe Leroy authored
vdso32_pages and vdso64_pages are not used anymore. Remove them. Signed-off-by:
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Christophe Leroy authored
__kernel_sync_dicache_p5() is an alternative to __kernel_sync_dicache() when cpu has CPU_FTR_COHERENT_ICACHE Remove this alternative function and merge __kernel_sync_dicache_p5() into __kernel_sync_dicache() using standard CPU feature fixup. Signed-off-by:
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Christophe Leroy authored
Add builtin symbols to locate fixup section and use them instead of locating sections through elf headers at runtime. Signed-off-by:
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Christophe Leroy authored
This is copied from arm64. Instead of using runtime generated signal trampoline offsets, get offsets at buildtime. If the said trampoline doesn't exist, build will fail. So no need to check whether the trampoline exists or not in the VDSO. Signed-off-by:
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Christophe Leroy authored
The \tmp param is not used anymore, remove it. Signed-off-by:
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Christophe Leroy authored
The VDSO datapage and the text pages are always located immediately next to each other, so it can be hardcoded without an indirection through __kernel_datapage_offset Signed-off-by:
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Christophe Leroy authored
Move the vdso datapage in front of the VDSO area, before vdso test. This will allow to remove the __kernel_datapage_offset symbol and simplify __get_datapage() in following patches. Signed-off-by:
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Christophe Leroy authored
All other architectures but s390 use a void pointer named 'vdso' to reference the VDSO mapping. In a following patch, the VDSO data page will be put in front of text, vdso_base will then not anymore point to VDSO text. To avoid confusion between vdso_base and VDSO text, rename vdso_base into vdso and make it a void __user *. Signed-off-by:
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Christophe Leroy authored
Provide vdso_remap() through _install_special_mapping() and drop arch_remap(). This adds a test of the size and returns -EINVAL if the size is not correct. Signed-off-by:
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Christophe Leroy authored
Copied from commit 2fea7f6c ("arm64: vdso: move to _install_special_mapping and remove arch_vma_name"). Use the new _install_special_mapping() API added by commit a62c34bd ("x86, mm: Improve _install_special_mapping and fix x86 vdso naming") which obsolete install_special_mapping(). And remove arch_vma_name() as the name is handled by the new API. Signed-off-by:
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Christophe Leroy authored
To simplify arch_setup_additional_pages() exit, rename it __arch_setup_additional_pages() and create a caller arch_setup_additional_pages() which does the locking. Signed-off-by:
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Christophe Leroy authored
In arch_setup_additional_pages(), instead of using number of VDSO pages and recalculate VDSO size, directly use the VDSO size. As vdso_ready is set, vdso_pages can't be 0 so just remove the test. Signed-off-by:
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Christophe Leroy authored
No need of all those #ifdefs around the pagelist initialisation, use IS_ENABLED(), GCC will kick out unused static variables. Signed-off-by:
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Christophe Leroy authored
The setup of VDSO pages is identical for 32 bits VDSO and 64 bits VDSO. Refactor that setup. And use &vdsoXX_start which is synonym of vdsoXX_kbase. Signed-off-by:
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Christophe Leroy authored
No need of a NULL last element in pagelists, install_special_mapping() knows how long the list is. Remove that element. Signed-off-by:
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Christophe Leroy authored
Partly copied from commit 16fb1a9b ("arm64: vdso: clean up vdso_pagelist initialization"). No need to get_page() the vdso text/data - these are part of the kernel image. Signed-off-by:
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Christophe Leroy authored
Today vdso_data structure has: - syscall_map_32[] and syscall_map_64[] on PPC64 - syscall_map_32[] on PPC32 On PPC32, syscall_map_32[] is populated using sys_call_table[]. On PPC64, syscall_map_64[] is populated using sys_call_table[] and syscal_map_32[] is populated using compat_sys_call_table[]. To simplify vdso_setup_syscall_map(), - On PPC32 rename syscall_map_32[] into syscall_map[], - On PPC64 rename syscall_map_64[] into syscall_map[], - On PPC64 rename syscall_map_32[] into compat_syscall_map[]. That way, syscall_map[] gets populated using sys_call_table[] and compat_syscall_map[] gets population using compat_sys_call_table[]. Also define an empty compat_syscall_map[] on PPC32 to avoid ifdefs. Signed-off-by:
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Christophe Leroy authored
Instead of including extern references locally in vdso_setup_syscall_map(), add the missing headers. sys_ni_syscall() being a function, cast its address to an unsigned long instead of declaring it as a fake unsigned long object. At the same time, remove a comment which paraphrases the function name. Signed-off-by:
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Christophe Leroy authored
Since commit 24b659a1 ("powerpc: Use unstripped VDSO image for more accurate profiling data"), only the unstripped VDSO image has been used. Partially revert commit 8150caad ("[POWERPC] powerpc vDSO: install unstripped copies on disk") to avoid building the stripped version. And the unstripped version in $(MODLIB)/vdso/ is not required anymore as it is the one embedded in the kernel image. Signed-off-by:
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Christophe Leroy authored
Change those two functions to be used within a user access block. For that, change save_general_regs() to and unsafe_save_general_regs(), then replace all user accesses by unsafe_ versions. This series leads to a reduction from 2.55s to 1.73s of the system CPU time with the following microbench app on an mpc832x with KUAP (approx 32%) Without KUAP, the difference is in the noise. void sigusr1(int sig) { } int main(int argc, char **argv) { int i = 100000; signal(SIGUSR1, sigusr1); for (;i--;) raise(SIGUSR1); exit(0); } An additional 0.10s reduction is achieved by removing CONFIG_PPC_FPU, as the mpc832x has no FPU. A bit less spectacular on an 8xx as KUAP is less heavy, prior to the series (with KUAP) it ran in 8.10 ms. Once applies the removal of FPU regs handling, we get 7.05s. With the full series, we get 6.9s. If artificially re-activating FPU regs handling with the full series, we get 7.6s. So for the 8xx, the removal of the FPU regs copy is what makes the difference, but the rework of handle_signal also have a benefit. Same as above, without KUAP the difference is in the noise. Signed-off-by:
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