- 18 Aug, 2023 23 commits
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Vaibhav Jain authored
This patch enables config option GENERIC_IDLE_POLL_SETUP for arch powerpc. This adds support for kernel param 'nohlt'. Powerpc kernel also supports another kernel boot-time param called 'powersave' which can also be used to disable all cpu idle-states and forces CPU to an idle-loop similar to what cpu_idle_poll() does. This patch however makes powerpc kernel-parameters better aligned to the generic boot-time parameters. Signed-off-by:
Vaibhav Jain <vaibhav@linux.ibm.com> Signed-off-by:
Michael Ellerman <mpe@ellerman.id.au> Link: https://msgid.link/20230818050739.827851-1-vaibhav@linux.ibm.com
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Hari Bathini authored
Invoke ibm,os-term call with rtas_call_unlocked(), without using the RTAS spinlock, to avoid deadlock in the unlikely event of a machine crash while making an RTAS call. Signed-off-by:
Hari Bathini <hbathini@linux.ibm.com> Reviewed-by:
Mahesh Salgaonkar <mahesh@linux.ibm.com> Signed-off-by:
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Nathan Lynch authored
Various char * parameters in the common powerpc selftest APIs can be const. Signed-off-by:
Nathan Lynch <nathanl@linux.ibm.com> Signed-off-by:
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Nathan Lynch authored
Add exec_prot to to mm/.gitignore and sort the result. Signed-off-by:
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Michal Suchanek authored
Avoid redefining the same value in multiple source. Signed-off-by:
Michal Suchanek <msuchanek@suse.de> Signed-off-by:
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Nick Desaulniers authored
This reverts commit 9c87156c. I have not been able to reproduce the reported -Wframe-larger-than= warning (or disassembly) with clang-11 or clang-18. I don't know precisely when this was fixed in llvm, but it may be time to revert this. Closes: https://github.com/ClangBuiltLinux/linux/issues/252Signed-off-by:
Nick Desaulniers <ndesaulniers@google.com> Reviewed-by:
Nathan Chancellor <nathan@kernel.org> Signed-off-by:
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Aneesh Kumar K.V authored
Parse the device tree in early init to find the memory block size to be used by the kernel. Consolidate the memory block size device tree parsing to one helper and use that on both powernv and pseries. We still want to use machine-specific callback because on all machine types other than powernv and pseries we continue to return MIN_MEMORY_BLOCK_SIZE. pseries_memory_block_size used to look for the second memory block (memory@x) to determine the memory_block_size value. This patch changed that to look at all memory blocks and make sure we can map them all correctly using the computed memory block size value. Add workaround to force 256MB memory block size if device driver managed memory such as GPU memory is present. This helps to add GPU memory that is not aligned to 1G. Co-developed-by:
Reza Arbab <arbab@linux.ibm.com> Signed-off-by:
"Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com> Signed-off-by:
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Trevor Woerner authored
Drop CONFIG_IP_NF_TARGET_CLUSTERIP as it was removed in commit 9db5d918 ("netfilter: ip_tables: remove clusterip target"). Signed-off-by:
Trevor Woerner <twoerner@gmail.com> Signed-off-by:
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Sourabh Jain authored
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: 8255da95 ("powerpc/fadump: release all the memory above boot memory size") Signed-off-by:
Sourabh Jain <sourabhjain@linux.ibm.com> Acked-by:
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Christophe Leroy authored
A W=1 build of ppc40x_defconfig throws the followings errors: CC arch/powerpc/platforms/4xx/uic.o arch/powerpc/platforms/4xx/uic.c:274:13: warning: no previous prototype for 'uic_init_tree' [-Wmissing-prototypes] 274 | void __init uic_init_tree(void) | ^~~~~~~~~~~~~ arch/powerpc/platforms/4xx/uic.c:319:14: warning: no previous prototype for 'uic_get_irq' [-Wmissing-prototypes] 319 | unsigned int uic_get_irq(void) | ^~~~~~~~~~~ CC arch/powerpc/platforms/4xx/machine_check.o CC arch/powerpc/platforms/4xx/soc.o arch/powerpc/platforms/4xx/soc.c:193:6: warning: no previous prototype for 'ppc4xx_reset_system' [-Wmissing-prototypes] 193 | void ppc4xx_reset_system(char *cmd) | ^~~~~~~~~~~~~~~~~~~ Add missing includes to get the missing prototypes. Signed-off-by:Christophe Leroy <christophe.leroy@csgroup.eu> Signed-off-by:
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Christophe Leroy authored
A W=1 build of 44x/iss476-smp_defconfig gives: arch/powerpc/mm/nohash/44x.c:220:13: error: no previous prototype for 'mmu_init_secondary' [-Werror=missing-prototypes] 220 | void __init mmu_init_secondary(int cpu) | ^~~~~~~~~~~~~~~~~~ That function is called from head_4xx.S Add a prototype in mmu_decl.h Signed-off-by: -
Christophe Leroy authored
4xx/iss476-smp_defconfig leads to: CC arch/powerpc/mm/nohash/tlb.o arch/powerpc/mm/nohash/tlb.c:322:13: error: no previous prototype for 'early_init_mmu_47x' [-Werror=missing-prototypes] 322 | void __init early_init_mmu_47x(void) | ^~~~~~~~~~~~~~~~~~ early_init_mmu_47x() is used only at one place and only locally. Fold it into its only caller and remove it. Signed-off-by: -
Christophe Leroy authored
ppc4xx_defconfig with W=1 results in: CC arch/powerpc/platforms/44x/warp.o arch/powerpc/platforms/44x/warp.c:369:5: error: no previous prototype for 'pika_dtm_register_shutdown' [-Werror=missing-prototypes] 369 | int pika_dtm_register_shutdown(void (*func)(void *arg), void *arg) | ^~~~~~~~~~~~~~~~~~~~~~~~~~ arch/powerpc/platforms/44x/warp.c:374:5: error: no previous prototype for 'pika_dtm_unregister_shutdown' [-Werror=missing-prototypes] 374 | int pika_dtm_unregister_shutdown(void (*func)(void *arg), void *arg) | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~ The functions were added by commit 4ebef31f ("[POWERPC] PIKA Warp: Update platform code to support Rev B boards") Those functions are not used localy and allthough their symbols are exported they are not declared in any header file so they can't be used. Remove them, then remove the associated list as it will now remain empty hence becomes useless. Signed-off-by: -
Christophe Leroy authored
Building ppc40x_defconfig throws the following error: CC arch/powerpc/kernel/traps.o arch/powerpc/kernel/traps.c:2232:29: warning: no previous prototype for 'WatchdogHandler' [-Wmissing-prototypes] 2232 | void __attribute__ ((weak)) WatchdogHandler(struct pt_regs *regs) | ^~~~~~~~~~~~~~~ This function was imported by commit 14cf11af ("powerpc: Merge enough to start building in arch/powerpc.") as a weak function but never defined and/or called outside traps.c As it has only one caller fold it inside its caller and remove it. Signed-off-by:Arnd Bergmann <arnd@arndb.de> Signed-off-by:
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Christophe Leroy authored
__set_pte_at() handles 3 main cases with #ifdefs plus the 'percpu' subcase which leads to code duplication. Rewrite the function using IS_ENABLED() to minimise the total number of cases and remove duplicated code. Signed-off-by:
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Christophe Leroy authored
A W=1 build of mpc885_ads_defconfig throws the following error: CC arch/powerpc/platforms/8xx/m8xx_setup.o arch/powerpc/platforms/8xx/m8xx_setup.c:41:1: error: no previous prototype for 'init_internal_rtc' [-Werror=missing-prototypes] 41 | init_internal_rtc(void) | ^~~~~~~~~~~~~~~~~ init_internal_rtc() was introduced by commit df34403d ("[POWERPC] 8xx: Add mpc885ads support and common mpc8xx files") as a weak function but has never been defined and/or used outside m8xx_setup.c As it is called only once there, just fold it into its caller and remove it. Signed-off-by: -
Christophe Leroy authored
CONFIG_8272 is never used, remove it. CONFIG_8260 is redundant with CONFIG_PPC_82xx, remove it. Signed-off-by:
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Christophe Leroy authored
Commit 859b21a0 ("powerpc: drop PowerQUICC II Family ADS platform support") removed last user of pq2_init_pci. Remove it. Signed-off-by:
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Christophe Leroy authored
usb.c contains three independent parts with no common part. Split it. Signed-off-by:
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Christophe Leroy authored
Replace printk(KERN_WARN with pr_warn( Remove a couple of blank lines Re-align multi-line code. Replace asm/io.h by linux/io.h mpc83xx.h doesn't need linux/device.h or asm/pci-bridge.h Signed-off-by:
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Christophe Leroy authored
Since commit 905e75c4 ("powerpc/fsl-pci: Unify pci/pcie initialization code") fsl_add_bridge() is not used anymore outside of fsl_pci.c Make it static. Signed-off-by:
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Christophe Leroy authored
mpc512x_select_reset_compat() is only used in the file it is defined. Make it static. Move mpc512x_restart_init() after mpc512x_select_reset_compat(). Signed-off-by:
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Justin Stitt authored
`strncpy` is deprecated for use on NUL-terminated destination strings [1]. `make_first_field()` should use similar implementation to `make_field()` due to memcpy having more obvious behavior here. The end result yields the same behavior as the previous `strncpy`-based implementation including the NUL-padding. Link: https://www.kernel.org/doc/html/latest/process/deprecated.html#strncpy-on-nul-terminated-strings [1] Link: https://github.com/KSPP/linux/issues/90Signed-off-by:
Justin Stitt <justinstitt@google.com> Reviewed-by:
Kees Cook <keescook@chromium.org> Tested-by:
Geoff Levand <geoff@infradead.org> Signed-off-by:
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- 16 Aug, 2023 17 commits
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Christophe Leroy authored
objtool reports the following warning: arch/powerpc/kernel/ptrace/ptrace-view.o: warning: objtool: gpr32_set_common+0x23c (.text+0x860): redundant UACCESS disable gpr32_set_common() conditionally opens and closes UACCESS based on whether kbuf pointer is NULL or not. This is wackelig. Split gpr32_set_common() in two fonctions, one for user one for kernel. Signed-off-by: -
Benjamin Gray authored
The documented ptrace request names are currently wrong/incomplete. Fix this to improve correctness and searchability. Signed-off-by:
Benjamin Gray <bgray@linux.ibm.com> Signed-off-by:
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Benjamin Gray authored
PowerPC was the only user of these hooks, and has been refactored to no longer require them. There is no need to keep them around, so remove them to reduce complexity. Signed-off-by:
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Benjamin Gray authored
Now that ptrace and perf are no longer exclusive, update the test to exercise interesting interactions. An assembly file is used for the children to allow precise instruction choice and addresses, while avoiding any compiler quirks. Signed-off-by:
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Benjamin Gray authored
ptrace and perf watchpoints were considered incompatible in commit 29da4f91 ("powerpc/watchpoint: Don't allow concurrent perf and ptrace events"), but the logic in that commit doesn't really apply. Ptrace doesn't automatically single step; the ptracer must request this explicitly. And the ptracer can do so regardless of whether a ptrace/perf watchpoint triggered or not: it could single step every instruction if it wanted to. Whatever stopped the ptracee before executing the instruction that would trigger the perf watchpoint is no longer relevant by this point. To get correct behaviour when perf and ptrace are watching the same data we must ignore the perf watchpoint. After all, ptrace has before-execute semantics, and perf is after-execute, so perf doesn't actually care about the watchpoint trigger at this point in time. Pausing before execution does not mean we will actually end up executing the instruction. Importantly though, we don't remove the perf watchpoint yet. This is key. The ptracer is free to do whatever it likes right now. E.g., it can continue the process, single step. or even set the child PC somewhere completely different. If it does try to execute the instruction though, without reinserting the watchpoint (in which case we go back to the start of this example), the perf watchpoint would immediately trigger. This time there is no ptrace watchpoint, so we can safely perform a single step and increment the perf counter. Upon receiving the single step exception, the existing code already handles propagating or consuming it based on whether another subsystem (e.g. ptrace) requested a single step. Again, this is needed with or without perf/ptrace exclusion, because ptrace could be single stepping this instruction regardless of if a watchpoint is involved. Signed-off-by:
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Benjamin Gray authored
We only remove watchpoints when they have the perf_single_step flag set, so we can reinsert them during the first iteration. Signed-off-by:
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Benjamin Gray authored
There is a bug in the current watchpoint tracking logic, where the teardown in arch_unregister_hw_breakpoint() uses bp->ctx->task, which it does not have a reference of and parallel threads may be in the process of destroying. This was partially addressed in commit fb822e60 ("powerpc/hw_breakpoint: Fix oops when destroying hw_breakpoint event"), but the underlying issue of accessing a struct member in an unknown state still remained. Syzkaller managed to trigger a null pointer derefernce due to the race between the task destructor and checking the pointer and dereferencing it in the loop. While this null pointer dereference could be fixed by using READ_ONCE to access the task up front, that just changes the error to manipulating possbily freed memory. Instead, the breakpoint logic needs to be reworked to remove any dependency on a context or task struct during breakpoint removal. The reason we have this currently is to clear thread.last_hit_ubp. This member is used to differentiate the perf DAWR single-step sequence from other causes of single-step, such as userspace just calling ptrace(PTRACE_SINGLESTEP, ...). We need to differentiate them because, when the single step interrupt is received, we need to know whether to re-insert the DAWR breakpoint (perf) or not (ptrace / other). arch_unregister_hw_breakpoint() needs to clear this information to prevent dangling pointers to possibly freed memory. These pointers are dereferenced in single_step_dabr_instruction() without a way to check their validity. This patch moves the tracking of this information to the breakpoint itself. This means we no longer have to do anything special to clean up. Signed-off-by:
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Benjamin Gray authored
info is cheap to retrieve, and is likely optimised by the compiler anyway. On the other hand, propagating it across the functions makes it possible to be inconsistent and adds needless complexity. Remove it, and invoke counter_arch_bp() when we need to work with it. As we don't persist it, we just use the local bp array to track whether we are ignoring a breakpoint. Signed-off-by:
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Benjamin Gray authored
The behaviour of the thread_change_pc() function is a bit cryptic without being more familiar with how the watchpoint logic handles perf's after-execute semantics. Expand the comment to explain why we can re-insert the breakpoint and unset the perf_single_step flag. Signed-off-by:
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Kajol Jain authored
docs: ABI: sysfs-bus-event_source-devices-hv_gpci: Document affinity_domain_via_partition sysfs interface file Add details of the new hv-gpci interface file called "affinity_domain_via_partition" in the ABI documentation. Reviewed-by:
Athira Rajeev <atrajeev@linux.vnet.ibm.com> Signed-off-by:
Kajol Jain <kjain@linux.ibm.com> Signed-off-by:
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Kajol Jain authored
powerpc/hv_gpci: Add sysfs file inside hv_gpci device to show affinity domain via partition information The hcall H_GET_PERF_COUNTER_INFO with counter request value as AFFINITY_DOMAIN_INFORMATION_BY_PARTITION(0XB1), can be used to get the system affinity domain via partition information. To expose the system affinity domain via partition information, patch adds sysfs file called "affinity_domain_via_partition" to the "/sys/devices/hv_gpci/interface/" of hv_gpci pmu driver. Add new entry for AFFINITY_DOMAIN_VIA_PAR in sysinfo_counter_request array, which points to the counter request value "affinity_domain_via_partition" in hv-gpci.c file. Also add a new function called "affinity_domain_via_partition_result_parse" to parse the hcall result and store it in output buffer. The affinity_domain_via_partition sysfs file is only available for power10 and above platforms. Add a macro called INTERFACE_AFFINITY_DOMAIN_VIA_PAR_ATTR, which points to the index of NULL placeholder, for affinity_domain_via_partition attribute in interface_attrs array. Also updated the value of INTERFACE_NULL_ATTR macro in hv-gpci.c file. Reviewed-by:
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Kajol Jain authored
docs: ABI: sysfs-bus-event_source-devices-hv_gpci: Document affinity_domain_via_domain sysfs interface file Add details of the new hv-gpci interface file called "affinity_domain_via_domain" in the ABI documentation. Reviewed-by:
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Kajol Jain authored
powerpc/hv_gpci: Add sysfs file inside hv_gpci device to show affinity domain via domain information The hcall H_GET_PERF_COUNTER_INFO with counter request value as AFFINITY_DOMAIN_INFORMATION_BY_DOMAIN(0XB0), can be used to get the system affinity domain via domain information. To expose the system affinity domain via domain information, patch adds sysfs file called "affinity_domain_via_domain" to the "/sys/devices/hv_gpci/interface/" of hv_gpci pmu driver. Add new entry for AFFINITY_DOMAIN_VIA_DOM in sysinfo_counter_request array, which points to the counter request value "affinity_domain_via_domain" in hv-gpci.c file. The affinity_domain_via_domain sysfs file is only available for power10 and above platforms. Add a macro called INTERFACE_AFFINITY_DOMAIN_VIA_DOM_ATTR, which points to the index of NULL placeholder, for affinity_domain_via_domain attribute in interface_attrs array. Also updated the value of INTERFACE_NULL_ATTR macro in hv-gpci.c file. Reviewed-by:
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Kajol Jain authored
docs: ABI: sysfs-bus-event_source-devices-hv_gpci: Document affinity_domain_via_virtual_processor sysfs interface file Add details of the new hv-gpci interface file called "affinity_domain_via_virtual_processor" in the ABI documentation. Reviewed-by:
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Kajol Jain authored
powerpc/hv_gpci: Add sysfs file inside hv_gpci device to show affinity domain via virtual processor information The hcall H_GET_PERF_COUNTER_INFO with counter request value as AFFINITY_DOMAIN_INFORMATION_BY_VIRTUAL_PROCESSOR(0XA0), can be used to get the system affinity domain via virtual processor information. To expose the system affinity domain via virtual processor information, patch adds sysfs file called "affinity_domain_via_virtual_processor" to the "/sys/devices/hv_gpci/interface/" of hv_gpci pmu driver. The affinity_domain_via_virtual_processor sysfs file is only available for power10 and above platforms. Add a macro called INTERFACE_AFFINITY_DOMAIN_VIA_VP_ATTR, which points to the index of NULL placeholder, for affinity_domain_via_virtual_processor attribute in interface_attrs array. Also updated the value of INTERFACE_NULL_ATTR macro in hv-gpci.c file. Reviewed-by:
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Kajol Jain authored
Add details of the new hv-gpci interface file called "processor_config" in the ABI documentation. Reviewed-by:
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Kajol Jain authored
The hcall H_GET_PERF_COUNTER_INFO with counter request value as PROCESSOR_CONFIG(0X90), can be used to get the system processor configuration information. To expose the system processor config information, patch adds sysfs file called "processor_config" to the "/sys/devices/hv_gpci/interface/" of hv_gpci pmu driver. Add enum and sysinfo_counter_request array to get required counter request value in hv-gpci.c file. Also add a new function called "sysinfo_device_attr_create", which will create and return required device attribute to the add_sysinfo_interface_files function. The processor_config sysfs file is only available for power10 and above platforms. Add a new macro called INTERFACE_PROCESSOR_CONFIG_ATTR, which points to the index of NULL placefolder, for processor_config attribute in the interface_attrs array. Also add macro INTERFACE_NULL_ATTR which points to index of NULL attribute in interface_attrs array. Reviewed-by:
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