kernel/linux.git/drivers/acpi/sysfs.c, branch v6.12.80

ACPI: sysfs: Enable ACPI sysfs support for CCEL records

2023-03-27T18:43:58+00:00

The Confidential Computing Event Log (CCEL) table provides the address and length of the CCEL records area in UEFI reserved memory. To allow user space access to these records, expose a sysfs interface similar to the BERT table. More details about the CCEL table can be found in the ACPI specification r6.5 [1], sec 5.2.34. Link: https://uefi.org/specs/ACPI/6.5/05_ACPI_Software_Programming_Model.html#cc-event-log-acpi-table # [1] Co-developed-by: Haibo Xu Signed-off-by: Haibo Xu Signed-off-by: Kuppuswamy Sathyanarayanan Signed-off-by: Rafael J. Wysocki

ACPI: make kobj_type structures constant

2023-02-14T14:52:37+00:00

Since commit ee6d3dd4ed48 ("driver core: make kobj_type constant.") the driver core allows the usage of const struct kobj_type. Take advantage of this to constify the structure definitions to prevent modification at runtime. Signed-off-by: Thomas Weißschuh Signed-off-by: Rafael J. Wysocki

ACPI: sysfs: use sysfs_emit() to instead of scnprintf()

2022-11-10T19:24:49+00:00

Replace scnprintf() with sysfs_emit() to simplify the code. Reported-by: Zeal Robot Signed-off-by: Xu Panda Signed-off-by: Yang Yang Signed-off-by: Rafael J. Wysocki

ACPI: sysfs: Use kstrtobool() instead of strtobool()

2022-11-03T18:46:54+00:00

strtobool() is the same as kstrtobool(). However, the latter is more used within the kernel. In order to remove strtobool() and slightly simplify kstrtox.h, switch to the other function name. While at it, include the corresponding header file () Signed-off-by: Christophe JAILLET Reviewed-by: Andy Shevchenko Signed-off-by: Rafael J. Wysocki

ACPI: sysfs: Fix BERT error region memory mapping

2022-04-13T17:58:14+00:00

Currently the sysfs interface maps the BERT error region as "memory" (through acpi_os_map_memory()) in order to copy the error records into memory buffers through memory operations (eg memory_read_from_buffer()). The OS system cannot detect whether the BERT error region is part of system RAM or it is "device memory" (eg BMC memory) and therefore it cannot detect which memory attributes the bus to memory support (and corresponding kernel mapping, unless firmware provides the required information). The acpi_os_map_memory() arch backend implementation determines the mapping attributes. On arm64, if the BERT error region is not present in the EFI memory map, the error region is mapped as device-nGnRnE; this triggers alignment faults since memcpy unaligned accesses are not allowed in device-nGnRnE regions. The ACPI sysfs code cannot therefore map by default the BERT error region with memory semantics but should use a safer default. Change the sysfs code to map the BERT error region as MMIO (through acpi_os_map_iomem()) and use the memcpy_fromio() interface to read the error region into the kernel buffer. Link: https://lore.kernel.org/linux-arm-kernel/31ffe8fc-f5ee-2858-26c5-0fd8bdd68702@arm.com Link: https://lore.kernel.org/linux-acpi/CAJZ5v0g+OVbhuUUDrLUCfX_mVqY_e8ubgLTU98=jfjTeb4t+Pw@mail.gmail.com Signed-off-by: Lorenzo Pieralisi Tested-by: Veronika Kabatova Tested-by: Aristeu Rozanski Acked-by: Ard Biesheuvel Signed-off-by: Rafael J. Wysocki

ACPI: sysfs: use default_groups in kobj_type

2021-12-28T18:15:41+00:00

There are currently 2 ways to create a set of sysfs files for a kobj_type, through the default_attrs field, and the default_groups field. Move the ACPI sysfs code to use default_groups field which has been the preferred way since aa30f47cf666 ("kobject: Add support for default attribute groups to kobj_type") so that we can soon get rid of the obsolete default_attrs field. Signed-off-by: Greg Kroah-Hartman Signed-off-by: Rafael J. Wysocki

Merge branches 'acpi-dptf' and 'acpi-messages'

2021-06-29T13:50:37+00:00

* acpi-dptf: ACPI: DPTF: Add battery participant for Intel SoCs * acpi-messages: ACPI: Remove the macro PREFIX "ACPI: " ACPI: sleep: Unify the message printing ACPI: sbs: Unify the message printing ACPI: scan: Unify the log message printing ACPI: sbshc: Unify the message printing ACPI: sysfs: Cleanup message printing ACPI: reboot: Unify the message printing ACPI: processor_throttling: Cleanup the printing messages ACPI: processor_perflib: Cleanup print messages ACPI: processor_thermal: Remove unused PREFIX for printing ACPI: pci_root: Unify the message printing ACPI: osl: Remove the duplicated PREFIX for message printing ACPI: nvs: Unify the message printing ACPI: glue: Clean up the printing messages ACPI: event: Use pr_*() macros to replace printk() ACPI: bus: Use pr_*() macros to replace printk() ACPI: blacklist: Unify the message printing ACPI: cmos_rtc: Using pr_fmt() and remove PREFIX

ACPI: sysfs: Remove tailing return statement in void function

2021-06-18T16:20:53+00:00

The tail return statement is redundant in void functions. Remove it. Signed-off-by: Andy Shevchenko Signed-off-by: Rafael J. Wysocki

ACPI: sysfs: Use __ATTR_RO() and __ATTR_RW() macros

2021-06-18T16:20:53+00:00

We have a few open-coded __ATTR_RO() and __ATTR_RW() macros. Replace the custom code with generic macros. Signed-off-by: Andy Shevchenko Signed-off-by: Rafael J. Wysocki

ACPI: sysfs: Sort headers alphabetically

2021-06-17T15:10:11+00:00

For the sake of better maintenance, sort included headers alphabetically. Signed-off-by: Andy Shevchenko Signed-off-by: Rafael J. Wysocki