kernel.git/arch/powerpc, branch linux-6.4.y

powerpc/ftrace: Fix dropping weak symbols with older toolchains

2023-09-13T07:48:39Z

commit f6834c8c59a8e977a6f6e4f96c5d28dfa5db8430 upstream. The minimum level of gcc supported for building the kernel is v5.1. v5.x releases of gcc emitted a three instruction sequence for -mprofile-kernel: mflr r0 std r0, 16(r1) bl _mcount It is only with the v6.x releases that gcc started emitting the two instruction sequence for -mprofile-kernel, omitting the second store instruction. With the older three instruction sequence, the actual ftrace location can be the 5th instruction into a function. Update the allowed offset for ftrace location from 12 to 16 to accommodate the same. Cc: stable@vger.kernel.org Fixes: 7af82ff90a2b06 ("powerpc/ftrace: Ignore weak functions") Signed-off-by: Naveen N Rao Reviewed-by: Christophe Leroy Signed-off-by: Michael Ellerman Link: https://msgid.link/7b265908a9461e38fc756ef9b569703860a80621.1687166935.git.naveen@kernel.org Signed-off-by: Greg Kroah-Hartman

powerpc/iommu: Fix notifiers being shared by PCI and VIO buses

2023-09-13T07:48:24Z

[ Upstream commit c37b6908f7b2bd24dcaaf14a180e28c9132b9c58 ] fail_iommu_setup() registers the fail_iommu_bus_notifier struct to both PCI and VIO buses. struct notifier_block is a linked list node, so this causes any notifiers later registered to either bus type to also be registered to the other since they share the same node. This causes issues in (at least) the vgaarb code, which registers a notifier for PCI buses. pci_notify() ends up being called on a vio device, converted with to_pci_dev() even though it's not a PCI device, and finally makes a bad access in vga_arbiter_add_pci_device() as discovered with KASAN: BUG: KASAN: slab-out-of-bounds in vga_arbiter_add_pci_device+0x60/0xe00 Read of size 4 at addr c000000264c26fdc by task swapper/0/1 Call Trace: dump_stack_lvl+0x1bc/0x2b8 (unreliable) print_report+0x3f4/0xc60 kasan_report+0x244/0x698 __asan_load4+0xe8/0x250 vga_arbiter_add_pci_device+0x60/0xe00 pci_notify+0x88/0x444 notifier_call_chain+0x104/0x320 blocking_notifier_call_chain+0xa0/0x140 device_add+0xac8/0x1d30 device_register+0x58/0x80 vio_register_device_node+0x9ac/0xce0 vio_bus_scan_register_devices+0xc4/0x13c __machine_initcall_pseries_vio_device_init+0x94/0xf0 do_one_initcall+0x12c/0xaa8 kernel_init_freeable+0xa48/0xba8 kernel_init+0x64/0x400 ret_from_kernel_thread+0x5c/0x64 Fix this by creating separate notifier_block structs for each bus type. Fixes: d6b9a81b2a45 ("powerpc: IOMMU fault injection") Reported-by: Nageswara R Sastry Signed-off-by: Russell Currey Tested-by: Nageswara R Sastry Reviewed-by: Andrew Donnellan [mpe: Add #ifdef to fix CONFIG_IBMVIO=n build] Signed-off-by: Michael Ellerman Link: https://msgid.link/20230322035322.328709-1-ruscur@russell.cc Signed-off-by: Sasha Levin

powerpc/mpc5xxx: Add missing fwnode_handle_put()

2023-09-13T07:48:24Z

[ Upstream commit b9bbbf4979073d5536b7650decd37fcb901e6556 ] In mpc5xxx_fwnode_get_bus_frequency(), we should add fwnode_handle_put() when break out of the iteration fwnode_for_each_parent_node() as it will automatically increase and decrease the refcounter. Fixes: de06fba62af6 ("powerpc/mpc5xxx: Switch mpc5xxx_get_bus_frequency() to use fwnode") Signed-off-by: Liang He Signed-off-by: Michael Ellerman Link: https://msgid.link/20230322030423.1855440-1-windhl@126.com Signed-off-by: Sasha Levin

powerpc/pseries: Fix hcall tracepoints with JUMP_LABEL=n

2023-09-13T07:48:24Z

[ Upstream commit 750bd41aeaeb1f0e0128aa4f8fcd6dd759713641 ] With JUMP_LABEL=n, hcall_tracepoint_refcount's address is being tested instead of its value. This results in the tracing slowpath always being taken unnecessarily. Fixes: 9a10ccb29c0a2 ("powerpc/pseries: move hcall_tracepoint_refcount out of .toc") Signed-off-by: Nicholas Piggin Signed-off-by: Michael Ellerman Link: https://msgid.link/20230509091600.70994-1-npiggin@gmail.com Signed-off-by: Sasha Levin

powerpc/pseries: Rework lppaca_shared_proc() to avoid DEBUG_PREEMPT

2023-09-13T07:48:24Z

[ Upstream commit eac030b22ea12cdfcbb2e941c21c03964403c63f ] lppaca_shared_proc() takes a pointer to the lppaca which is typically accessed through get_lppaca(). With DEBUG_PREEMPT enabled, this leads to checking if preemption is enabled, for example: BUG: using smp_processor_id() in preemptible [00000000] code: grep/10693 caller is lparcfg_data+0x408/0x19a0 CPU: 4 PID: 10693 Comm: grep Not tainted 6.5.0-rc3 #2 Call Trace: dump_stack_lvl+0x154/0x200 (unreliable) check_preemption_disabled+0x214/0x220 lparcfg_data+0x408/0x19a0 ... This isn't actually a problem however, as it does not matter which lppaca is accessed, the shared proc state will be the same. vcpudispatch_stats_procfs_init() already works around this by disabling preemption, but the lparcfg code does not, erroring any time /proc/powerpc/lparcfg is accessed with DEBUG_PREEMPT enabled. Instead of disabling preemption on the caller side, rework lppaca_shared_proc() to not take a pointer and instead directly access the lppaca, bypassing any potential preemption checks. Fixes: f13c13a00512 ("powerpc: Stop using non-architected shared_proc field in lppaca") Signed-off-by: Russell Currey [mpe: Rework to avoid needing a definition in paca.h and lppaca.h] Signed-off-by: Michael Ellerman Link: https://msgid.link/20230823055317.751786-4-mpe@ellerman.id.au Signed-off-by: Sasha Levin

powerpc: Don't include lppaca.h in paca.h

2023-09-13T07:48:24Z

[ Upstream commit 1aa000667669fa855853decbb1c69e974d8ff716 ] By adding a forward declaration for struct lppaca we can untangle paca.h and lppaca.h. Also move get_lppaca() into lppaca.h for consistency. Add includes of lppaca.h to some files that need it. Signed-off-by: Michael Ellerman Link: https://msgid.link/20230823055317.751786-3-mpe@ellerman.id.au Stable-dep-of: eac030b22ea1 ("powerpc/pseries: Rework lppaca_shared_proc() to avoid DEBUG_PREEMPT") Signed-off-by: Sasha Levin

powerpc/perf: Convert fsl_emb notifier to state machine callbacks

2023-09-13T07:48:23Z

[ Upstream commit 34daf445f82bd3a4df852bb5f1dffd792ac830a0 ] CC arch/powerpc/perf/core-fsl-emb.o arch/powerpc/perf/core-fsl-emb.c:675:6: error: no previous prototype for 'hw_perf_event_setup' [-Werror=missing-prototypes] 675 | void hw_perf_event_setup(int cpu) | ^~~~~~~~~~~~~~~~~~~ Looks like fsl_emb was completely missed by commit 3f6da3905398 ("perf: Rework and fix the arch CPU-hotplug hooks") So, apply same changes as commit 3f6da3905398 ("perf: Rework and fix the arch CPU-hotplug hooks") then commit 57ecde42cc74 ("powerpc/perf: Convert book3s notifier to state machine callbacks") While at it, also fix following error: arch/powerpc/perf/core-fsl-emb.c: In function 'perf_event_interrupt': arch/powerpc/perf/core-fsl-emb.c:648:13: error: variable 'found' set but not used [-Werror=unused-but-set-variable] 648 | int found = 0; | ^~~~~ Fixes: 3f6da3905398 ("perf: Rework and fix the arch CPU-hotplug hooks") Signed-off-by: Christophe Leroy Signed-off-by: Michael Ellerman Link: https://msgid.link/603e1facb32608f88f40b7d7b9094adc50e7b2dc.1692349125.git.christophe.leroy@csgroup.eu Signed-off-by: Sasha Levin

powerpc/fadump: reset dump area size if fadump memory reserve fails

2023-09-13T07:48:23Z

[ Upstream commit d1eb75e0dfed80d2d85b664e28a39f65b290ab55 ] In case fadump_reserve_mem() fails to reserve memory, the reserve_dump_area_size variable will retain the reserve area size. This will lead to /sys/kernel/fadump/mem_reserved node displaying an incorrect memory reserved by fadump. To fix this problem, reserve dump area size variable is set to 0 if fadump failed to reserve memory. Fixes: 8255da95e545 ("powerpc/fadump: release all the memory above boot memory size") Signed-off-by: Sourabh Jain Acked-by: Mahesh Salgaonkar Signed-off-by: Michael Ellerman Link: https://msgid.link/20230704050715.203581-1-sourabhjain@linux.ibm.com Signed-off-by: Sasha Levin

powerpc/radix: Move some functions into #ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE

2023-09-13T07:48:22Z

[ Upstream commit 4a9dd8f292efd614f0a18452e6474fe19ae17b47 ] With skiboot_defconfig, Clang reports: CC arch/powerpc/mm/book3s64/radix_tlb.o arch/powerpc/mm/book3s64/radix_tlb.c:419:20: error: unused function '_tlbie_pid_lpid' [-Werror,-Wunused-function] static inline void _tlbie_pid_lpid(unsigned long pid, unsigned long lpid, ^ arch/powerpc/mm/book3s64/radix_tlb.c:663:20: error: unused function '_tlbie_va_range_lpid' [-Werror,-Wunused-function] static inline void _tlbie_va_range_lpid(unsigned long start, unsigned long end, ^ This is because those functions are only called from functions enclosed in a #ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE Move below functions inside that #ifdef * __tlbie_pid_lpid(unsigned long pid, * __tlbie_va_lpid(unsigned long va, unsigned long pid, * fixup_tlbie_pid_lpid(unsigned long pid, unsigned long lpid) * _tlbie_pid_lpid(unsigned long pid, unsigned long lpid, * fixup_tlbie_va_range_lpid(unsigned long va, * __tlbie_va_range_lpid(unsigned long start, unsigned long end, * _tlbie_va_range_lpid(unsigned long start, unsigned long end, Fixes: f0c6fbbb9050 ("KVM: PPC: Book3S HV: Add support for H_RPT_INVALIDATE") Reported-by: kernel test robot Closes: https://lore.kernel.org/oe-kbuild-all/202307260802.Mjr99P5O-lkp@intel.com/ Signed-off-by: Christophe Leroy Signed-off-by: Michael Ellerman Link: https://msgid.link/3d72efd39f986ee939d068af69fdce28bd600766.1691568093.git.christophe.leroy@csgroup.eu Signed-off-by: Sasha Levin

powerpc/powermac: Use early_* IO variants in via_calibrate_decr()

2023-09-13T07:47:53Z

[ Upstream commit 86582e6189dd8f9f52c25d46c70fe5d111da6345 ] On a powermac platform, via the call path: start_kernel() time_init() ppc_md.calibrate_decr() (pmac_calibrate_decr) via_calibrate_decr() ioremap() and iounmap() are called. The unmap can enable interrupts unexpectedly (cond_resched() in vunmap_pmd_range()), which causes a warning later in the boot sequence in start_kernel(). Use the early_* variants of these IO functions to prevent this. The issue is pre-existing, but is surfaced by commit 721255b9826b ("genirq: Use a maple tree for interrupt descriptor management"). Signed-off-by: Benjamin Gray Reviewed-by: Christophe Leroy Signed-off-by: Michael Ellerman Link: https://msgid.link/20230706010816.72682-1-bgray@linux.ibm.com Signed-off-by: Sasha Levin