kernel/linux.git/include/linux/pm.h, branch v6.6.132

PM: sleep: Fix symbol export for _SIMPLE_ variants of _PM_OPS()

2023-11-20T10:58:57+00:00

[ Upstream commit 8d74f1da776da9b0306630b13a3025214fa44618 ] Currently EXPORT_*_SIMPLE_DEV_PM_OPS() use EXPORT_*_DEV_PM_OPS() set of macros to export dev_pm_ops symbol, which export the symbol in case CONFIG_PM=y but don't take CONFIG_PM_SLEEP into consideration. Since _SIMPLE_ variants of _PM_OPS() do not include runtime PM handles and are only used in case CONFIG_PM_SLEEP=y, we should not be exporting dev_pm_ops symbol for them in case CONFIG_PM_SLEEP=n. This can be fixed by having two distinct set of export macros for both _RUNTIME_ and _SIMPLE_ variants of _PM_OPS(), such that the export of dev_pm_ops symbol used in each variant depends on CONFIG_PM and CONFIG_PM_SLEEP respectively. Introduce _DEV_SLEEP_PM_OPS() set of export macros for _SIMPLE_ variants of _PM_OPS(), which export dev_pm_ops symbol only in case CONFIG_PM_SLEEP=y and discard it otherwise. Fixes: 34e1ed189fab ("PM: Improve EXPORT_*_DEV_PM_OPS macros") Signed-off-by: Raag Jadav Reviewed-by: Paul Cercueil Signed-off-by: Rafael J. Wysocki Signed-off-by: Sasha Levin

pm: Introduce DEFINE_NOIRQ_DEV_PM_OPS() helper

2023-08-21T15:58:09+00:00

_DEFINE_DEV_PM_OPS() helps to define PM operations for the system sleep and/or runtime PM cases. Some of the existing users want to have _noirq() variants to be set. For that purpose introduce a new helper which sets up _noirq() callbacks to be assigned and struct dev_pm_ops be provided. Acked-by: "Rafael J. Wysocki" Reviewed-by: Jonathan Cameron Reviewed-by: Paul Cercueil Reviewed-by: Geert Uytterhoeven Link: https://lore.kernel.org/r/20230717172821.62827-2-andriy.shevchenko@linux.intel.com Signed-off-by: Andy Shevchenko

linux/export.h: rename 'sec' argument to 'license'

2023-06-22T12:21:06+00:00

Now, EXPORT_SYMBOL() is populated in two stages. In the first stage, all of EXPORT_SYMBOL/EXPORT_SYMBOL_GPL go into the same section, '.export_symbol'. 'sec' does not make sense any more. Rename it to 'license'. Signed-off-by: Masahiro Yamada Reviewed-by: Nick Desaulniers

kbuild: generate KSYMTAB entries by modpost

2023-06-22T12:17:10+00:00

Commit 7b4537199a4a ("kbuild: link symbol CRCs at final link, removing CONFIG_MODULE_REL_CRCS") made modpost output CRCs in the same way whether the EXPORT_SYMBOL() is placed in *.c or *.S. For further cleanups, this commit applies a similar approach to the entire data structure of EXPORT_SYMBOL(). The EXPORT_SYMBOL() compilation is split into two stages. When a source file is compiled, EXPORT_SYMBOL() will be converted into a dummy symbol in the .export_symbol section. For example, EXPORT_SYMBOL(foo); EXPORT_SYMBOL_NS_GPL(bar, BAR_NAMESPACE); will be encoded into the following assembly code: .section ".export_symbol","a" __export_symbol_foo: .asciz "" /* license */ .asciz "" /* name space */ .balign 8 .quad foo /* symbol reference */ .previous .section ".export_symbol","a" __export_symbol_bar: .asciz "GPL" /* license */ .asciz "BAR_NAMESPACE" /* name space */ .balign 8 .quad bar /* symbol reference */ .previous They are mere markers to tell modpost the name, license, and namespace of the symbols. They will be dropped from the final vmlinux and modules because the *(.export_symbol) will go into /DISCARD/ in the linker script. Then, modpost extracts all the information about EXPORT_SYMBOL() from the .export_symbol section, and generates the final C code: KSYMTAB_FUNC(foo, "", ""); KSYMTAB_FUNC(bar, "_gpl", "BAR_NAMESPACE"); KSYMTAB_FUNC() (or KSYMTAB_DATA() if it is data) is expanded to struct kernel_symbol that will be linked to the vmlinux or a module. With this change, EXPORT_SYMBOL() works in the same way for *.c and *.S files, providing the following benefits. [1] Deprecate EXPORT_DATA_SYMBOL() In the old days, EXPORT_SYMBOL() was only available in C files. To export a symbol in *.S, EXPORT_SYMBOL() was placed in a separate *.c file. arch/arm/kernel/armksyms.c is one example written in the classic manner. Commit 22823ab419d8 ("EXPORT_SYMBOL() for asm") removed this limitation. Since then, EXPORT_SYMBOL() can be placed close to the symbol definition in *.S files. It was a nice improvement. However, as that commit mentioned, you need to use EXPORT_DATA_SYMBOL() for data objects on some architectures. In the new approach, modpost checks symbol's type (STT_FUNC or not), and outputs KSYMTAB_FUNC() or KSYMTAB_DATA() accordingly. There are only two users of EXPORT_DATA_SYMBOL: EXPORT_DATA_SYMBOL_GPL(empty_zero_page) (arch/ia64/kernel/head.S) EXPORT_DATA_SYMBOL(ia64_ivt) (arch/ia64/kernel/ivt.S) They are transformed as follows and output into .vmlinux.export.c KSYMTAB_DATA(empty_zero_page, "_gpl", ""); KSYMTAB_DATA(ia64_ivt, "", ""); The other EXPORT_SYMBOL users in ia64 assembly are output as KSYMTAB_FUNC(). EXPORT_DATA_SYMBOL() is now deprecated. [2] merge and There are two similar header implementations: include/linux/export.h for .c files include/asm-generic/export.h for .S files Ideally, the functionality should be consistent between them, but they tend to diverge. Commit 8651ec01daed ("module: add support for symbol namespaces.") did not support the namespace for *.S files. This commit shifts the essential implementation part to C, which supports EXPORT_SYMBOL_NS() for *.S files. and will remain as a wrapper of for a while. They will be removed after #include directives are all replaced with #include . [3] Implement CONFIG_TRIM_UNUSED_KSYMS in one-pass algorithm (by a later commit) When CONFIG_TRIM_UNUSED_KSYMS is enabled, Kbuild recursively traverses the directory tree to determine which EXPORT_SYMBOL to trim. If an EXPORT_SYMBOL turns out to be unused by anyone, Kbuild begins the second traverse, where some source files are recompiled with their EXPORT_SYMBOL() tuned into a no-op. We can do this better now; modpost can selectively emit KSYMTAB entries that are really used by modules. Signed-off-by: Masahiro Yamada Reviewed-by: Nick Desaulniers

PM: Add EXPORT macros for exporting PM functions

2023-02-13T18:17:34+00:00

Add a pair of macros for exporting functions only if CONFIG_PM is enabled. The naming follows the style of the standard EXPORT_SYMBOL_*() macros that they replace. Sometimes a module wants to export PM functions directly to other drivers, not a complete struct dev_pm_ops. A typical example is where a core library exports the generic (shared) implementation and calling code wraps one or more of these in custom code. Signed-off-by: Richard Fitzgerald Signed-off-by: Rafael J. Wysocki

PM: Improve EXPORT_*_DEV_PM_OPS macros

2022-10-04T18:52:38+00:00

Update the _EXPORT_DEV_PM_OPS() internal macro. It was not used anywhere outside pm.h and pm_runtime.h, so it is safe to update it. Before, this macro would take a few parameters to be used as sleep and runtime callbacks. This made it unsuitable to use with different callbacks, for instance the "noirq" ones. It is now semantically different: instead of creating a conditionally exported dev_pm_ops structure, it only contains part of the definition. This macro should however never be used directly (hence the trailing underscore). Instead, the following four macros are provided: - EXPORT_DEV_PM_OPS(name) - EXPORT_GPL_DEV_PM_OPS(name) - EXPORT_NS_DEV_PM_OPS(name, ns) - EXPORT_NS_GPL_DEV_PM_OPS(name, ns) For instance, it is now possible to conditionally export noirq suspend/resume PM functions like this: EXPORT_GPL_DEV_PM_OPS(foo_pm_ops) = { NOIRQ_SYSTEM_SLEEP_PM_OPS(suspend_fn, resume_fn) }; The existing helper macros EXPORT_*_SIMPLE_DEV_PM_OPS() and EXPORT_*_RUNTIME_DEV_PM_OPS() have been updated to use these new macros. Signed-off-by: Paul Cercueil Reviewed-by: Jonathan Cameron Signed-off-by: Rafael J. Wysocki

Merge tag 'pm-5.19-rc1-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm

2022-05-30T18:37:26+00:00

Pull more power management updates from Rafael Wysocki: "These update the ARM cpufreq drivers and fix up the CPPC cpufreq driver after recent changes, update the OPP code and PM documentation and add power sequences support to the system reboot and power off code. Specifics: - Add Tegra234 cpufreq support (Sumit Gupta) - Clean up and enhance the Mediatek cpufreq driver (Wan Jiabing, Rex-BC Chen, and Jia-Wei Chang) - Fix up the CPPC cpufreq driver after recent changes (Zheng Bin, Pierre Gondois) - Minor update to dt-binding for Qcom's opp-v2-kryo-cpu (Yassine Oudjana) - Use list iterator only inside the list_for_each_entry loop (Xiaomeng Tong, and Jakob Koschel) - New APIs related to finding OPP based on interconnect bandwidth (Krzysztof Kozlowski) - Fix the missing of_node_put() in _bandwidth_supported() (Dan Carpenter) - Cleanups (Krzysztof Kozlowski, and Viresh Kumar) - Add Out of Band mode description to the intel-speed-select utility documentation (Srinivas Pandruvada) - Add power sequences support to the system reboot and power off code and make related platform-specific changes for multiple platforms (Dmitry Osipenko, Geert Uytterhoeven)" * tag 'pm-5.19-rc1-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm: (60 commits) cpufreq: CPPC: Fix unused-function warning cpufreq: CPPC: Fix build error without CONFIG_ACPI_CPPC_CPUFREQ_FIE Documentation: admin-guide: PM: Add Out of Band mode kernel/reboot: Change registration order of legacy power-off handler m68k: virt: Switch to new sys-off handler API kernel/reboot: Add devm_register_restart_handler() kernel/reboot: Add devm_register_power_off_handler() soc/tegra: pmc: Use sys-off handler API to power off Nexus 7 properly reboot: Remove pm_power_off_prepare() regulator: pfuze100: Use devm_register_sys_off_handler() ACPI: power: Switch to sys-off handler API memory: emif: Use kernel_can_power_off() mips: Use do_kernel_power_off() ia64: Use do_kernel_power_off() x86: Use do_kernel_power_off() sh: Use do_kernel_power_off() m68k: Switch to new sys-off handler API powerpc: Use do_kernel_power_off() xen/x86: Use do_kernel_power_off() parisc: Use do_kernel_power_off() ...

Merge tag 'cxl-for-5.19' of git://git.kernel.org/pub/scm/linux/kernel/git/cxl/cxl

2022-05-28T04:24:19+00:00

Pull cxl updates from Dan Williams: "Compute Express Link (CXL) updates for this cycle. The highlight is new driver-core infrastructure and CXL subsystem changes for allowing lockdep to validate device_lock() usage. Thanks to PeterZ for setting me straight on the current capabilities of the lockdep API, and Greg acked it as well. On the CXL ACPI side this update adds support for CXL _OSC so that platform firmware knows that it is safe to still grant Linux native control of PCIe hotplug and error handling in the presence of CXL devices. A circular dependency problem was discovered between suspend and CXL memory for cases where the suspend image might be stored in CXL memory where that image also contains the PCI register state to restore to re-enable the device. Disable suspend for now until an architecture is defined to clarify that conflict. Lastly a collection of reworks, fixes, and cleanups to the CXL subsystem where support for snooping mailbox commands and properly handling the "mem_enable" flow are the highlights. Summary: - Add driver-core infrastructure for lockdep validation of device_lock(), and fixup a deadlock report that was previously hidden behind the 'lockdep no validate' policy. - Add CXL _OSC support for claiming native control of CXL hotplug and error handling. - Disable suspend in the presence of CXL memory unless and until a protocol is identified for restoring PCI device context from memory hosted on CXL PCI devices. - Add support for snooping CXL mailbox commands to protect against inopportune changes, like set-partition with the 'immediate' flag set. - Rework how the driver detects legacy CXL 1.1 configurations (CXL DVSEC / 'mem_enable') before enabling new CXL 2.0 decode configurations (CXL HDM Capability). - Miscellaneous cleanups and fixes from -next exposure" * tag 'cxl-for-5.19' of git://git.kernel.org/pub/scm/linux/kernel/git/cxl/cxl: (47 commits) cxl/port: Enable HDM Capability after validating DVSEC Ranges cxl/port: Reuse 'struct cxl_hdm' context for hdm init cxl/port: Move endpoint HDM Decoder Capability init to port driver cxl/pci: Drop @info argument to cxl_hdm_decode_init() cxl/mem: Merge cxl_dvsec_ranges() and cxl_hdm_decode_init() cxl/mem: Skip range enumeration if mem_enable clear cxl/mem: Consolidate CXL DVSEC Range enumeration in the core cxl/pci: Move cxl_await_media_ready() to the core cxl/mem: Validate port connectivity before dvsec ranges cxl/mem: Fix cxl_mem_probe() error exit cxl/pci: Drop wait_for_valid() from cxl_await_media_ready() cxl/pci: Consolidate wait_for_media() and wait_for_media_ready() cxl/mem: Drop mem_enabled check from wait_for_media() nvdimm: Fix firmware activation deadlock scenarios device-core: Kill the lockdep_mutex nvdimm: Drop nd_device_lock() ACPI: NFIT: Drop nfit_device_lock() nvdimm: Replace lockdep_mutex with local lock classes cxl: Drop cxl_device_lock() cxl/acpi: Add root device lockdep validation ...

Merge back reboot/poweroff notifiers rework for 5.19-rc1.

2022-05-25T12:38:29+00:00

reboot: Remove pm_power_off_prepare()

2022-05-19T17:30:31+00:00

All pm_power_off_prepare() users were converted to sys-off handler API. Remove the obsolete global callback variable. Signed-off-by: Dmitry Osipenko Signed-off-by: Rafael J. Wysocki